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Changes in version 0.4.8.12 - 2024-06-06
This is a minor release with couple bugfixes affecting conflux and logging.
We also have the return of faravahar directory authority with new keys and
address.
o Minor feature (dirauth):
- Add back faravahar with a new address and new keys. Closes 40689.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on June 06, 2024.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2024/06/06.
o Minor bugfix (circuit):
- Remove a log_warn being triggered by a protocol violation that
already emits a protocol warning log. Fixes bug 40932; bugfix
on 0.4.8.1-alpha.
o Minor bugfixes (conflux):
- Avoid a potential hard assert (crash) when sending a cell on a
Conflux set. Fixes bug 40921; bugfix on 0.4.8.1-alpha.
- Make sure we don't process a closed circuit when packaging data.
This lead to a non fatal BUG() spamming logs. Fixes bug 40908;
bugfix on 0.4.8.1-alpha.
Changes in version 0.4.8.11 - 2024-04-10
This is a minor release mostly to upgrade the fallbackdir list.
Directory authorities running this version will now automatically
reject relays running the end of life 0.4.7.x version.
o Minor features (directory authorities):
- Reject 0.4.7.x series at the authority level. Closes ticket 40896.
- New IP address and keys for tor26.
- Allow BandwidthFiles "node_id" KeyValue without the dollar sign at
the start of the hexdigit, in order to easier database queries
combining Tor documents in which the relays fingerprint does not
include it. Fixes bug 40891; bugfix on 0.4.7 (all supported
versions of Tor).
o Minor features (fallbackdir):
- Regenerate fallback directories generated on April 10, 2024.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2024/04/10.
o Minor bugfixes (directory authorities):
- Add a warning when publishing a vote or signatures to another
directory authority fails. Fixes bug 40910; bugfix on 0.2.0.3-alpha.
Changes in version 0.4.8.10 - 2023-12-08
This is a security release fixing a high severity bug (TROVE-2023-007)
affecting Exit relays supporting Conflux. We strongly recommend to update as
soon as possible.
o Major bugfixes (TROVE-2023-007, exit):
- Improper error propagation from a safety check in conflux leg
linking led to a desynchronization of which legs were part of a
conflux set, ultimately causing a UAF and NULL pointer dereference
crash on Exit relays. Fixes bug 40897; bugfix on 0.4.8.1-alpha.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on December 08, 2023.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2023/12/08.
o Minor bugfixes (bridges, statistics):
- Correctly report statistics for client count over pluggable
transports. Fixes bug 40871; bugfix on 0.4.8.4.
Changes in version 0.4.8.9 - 2023-11-09
This is another security release fixing a high severity bug affecting onion
services which is tracked by TROVE-2023-006. We are also releasing a guard
major bugfix as well. If you are an onion service operator, we strongly
recommend to update as soon as possible.
o Major bugfixes (guard usage):
- When Tor excluded a guard due to temporary circuit restrictions,
it considered *additional* primary guards for potential usage by
that circuit. This could result in more than the specified number
of guards (currently 2) being used, long-term, by the tor client.
This could happen when a Guard was also selected as an Exit node,
but it was exacerbated by the Conflux guard restrictions. Both
instances have been fixed. Fixes bug 40876; bugfix
on 0.3.0.1-alpha.
o Major bugfixes (onion service, TROVE-2023-006):
- Fix a possible hard assert on a NULL pointer when recording a
failed rendezvous circuit on the service side for the MetricsPort.
Fixes bug 40883; bugfix on 0.4.8.1-alpha.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on November 09, 2023.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2023/11/09.
Changes in version 0.4.8.8 - 2023-11-03
We are releasing today a fix for a high security issue, TROVE-2023-004, that
is affecting relays. Also a few minor bugfixes detailed below. Please upgrade
as soon as posssible.
o Major bugfixes (TROVE-2023-004, relay):
- Mitigate an issue when Tor compiled with OpenSSL can crash during
handshake with a remote relay. Fixes bug 40874; bugfix
on 0.2.7.2-alpha.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on November 03, 2023.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2023/11/03.
o Minor bugfixes (directory authority):
- Look at the network parameter "maxunmeasuredbw" with the correct
spelling. Fixes bug 40869; bugfix on 0.4.6.1-alpha.
o Minor bugfixes (vanguards addon support):
- Count the conflux linked cell as valid when it is successfully
processed. This will quiet a spurious warn in the vanguards addon.
Fixes bug 40878; bugfix on 0.4.8.1-alpha.
Changes in version 0.4.8.7 - 2023-09-25
This version fixes a single major bug in the Conflux subsystem on the client
side. See below for more information. The upcoming Tor Browser 13 stable will
pick this up.
o Major bugfixes (conflux):
- Fix an issue that prevented us from pre-building more conflux sets
after existing sets had been used. Fixes bug 40862; bugfix
on 0.4.8.1-alpha.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on September 25, 2023.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2023/09/25.
Changes in version 0.4.8.6 - 2023-09-18
This version contains an important fix for onion service regarding congestion
control and its reliability. Apart from that, unneeded BUG warnings have been
suppressed especially about a compression bomb seen on relays. We strongly
recommend, in particular onion service operators, to upgrade as soon as
possible to this latest stable.
o Major bugfixes (onion service):
- Fix a reliability issue where services were expiring their
introduction points every consensus update. This caused
connectivity issues for clients caching the old descriptor and
intro points. Bug reported and fixed by gitlab user
@hyunsoo.kim676. Fixes bug 40858; bugfix on 0.4.7.5-alpha.
o Minor features (debugging, compression):
- Log the input and output buffer sizes when we detect a potential
compression bomb. Diagnostic for ticket 40739.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on September 18, 2023.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2023/09/18.
o Minor bugfix (defensive programming):
- Disable multiple BUG warnings of a missing relay identity key when
starting an instance of Tor compiled without relay support. Fixes
bug 40848; bugfix on 0.4.3.1-alpha.
o Minor bugfixes (bridge authority):
- When reporting a pseudo-networkstatus as a bridge authority, or
answering "ns/purpose/*" controller requests, include accurate
published-on dates from our list of router descriptors. Fixes bug
40855; bugfix on 0.4.8.1-alpha.
o Minor bugfixes (compression, zstd):
- Use less frightening language and lower the log-level of our run-
time ABI compatibility check message in our Zstd compression
subsystem. Fixes bug 40815; bugfix on 0.4.3.1-alpha.
Changes in version 0.4.8.5 - 2023-08-30
Quick second release after the first stable few days ago fixing minor
annoying bugfixes creating log BUG stacktrace. We also fix BSD compilation
failures and PoW unit test.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on August 30, 2023.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2023/08/30.
o Minor bugfix (NetBSD, compilation):
- Fix compilation issue on NetBSD by avoiding an unnecessary
dependency on "huge" page mappings in Equi-X. Fixes bug 40843;
bugfix on 0.4.8.1-alpha.
o Minor bugfix (NetBSD, testing):
- Fix test failures in "crypto/hashx" and "slow/crypto/equix" on
x86_64 and aarch64 NetBSD hosts, by adding support for
PROT_MPROTECT() flags. Fixes bug 40844; bugfix on 0.4.8.1-alpha.
o Minor bugfixes (conflux):
- Demote a relay-side warn about too many legs to ProtocolWarn, as
there are conditions that it can briefly happen during set
construction. Also add additional set logging details for all
error cases. Fixes bug 40841; bugfix on 0.4.8.1-alpha.
- Prevent non-fatal assert stacktrace caused by using conflux sets
during their teardown process. Fixes bug 40842; bugfix
on 0.4.8.1-alpha.
Changes in version 0.4.8.4 - 2023-08-23
Finally, this is the very first stable release of the 0.4.8.x series making
Proof-of-Work (prop#327) and Conflux (prop#329) available to the entire
network. Some major bugfixes since the release candidate detailed below.
o Major feature (denial of service):
- Extend DoS protection to partially opened channels and known
relays. Because re-entry is not allowed anymore, we can apply DoS
protections onto known IP namely relays. Fixes bug 40821; bugfix
on 0.3.5.1-alpha.
o Major bugfixes (conflux):
- Fix a relay-side crash caused by side effects of the fix for bug
40827. Reverts part of that fix that caused the crash and adds
additional log messages to help find the root cause. Fixes bug
40834; bugfix on 0.4.8.3-rc.
o Major bugfixes (proof of work, onion service, hashx):
- Fix a very rare buffer overflow in hashx, specific to the dynamic
compiler on aarch64 platforms. Fixes bug 40833; bugfix
on 0.4.8.2-alpha.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on August 23, 2023.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2023/08/23.
o Minor features (testing):
- All Rust code is now linted (cargo clippy) as part of GitLab CI, and
existing warnings have been fixed. - Any unit tests written in Rust now
run as part of GitLab CI.
o Minor bugfix (FreeBSD, compilation):
- Fix compilation issue on FreeBSD by properly importing
sys/param.h. Fixes bug 40825; bugfix on 0.4.8.1-alpha.
o Minor bugfixes (compression):
- Right after compression/decompression work is done, check for
errors. Before this, we would consider compression bomb before
that and then looking for errors leading to false positive on that
log warning. Fixes bug 40739; bugfix on 0.3.5.1-alpha. Patch
by "cypherpunks".
Changes in version 0.4.8.3-rc - 2023-08-04
This is the first release candidate (and likely the only) of the 0.4.8.x
series. We fixed a major conflux bugfix which was a fatal asserts on the
relay Exit side. See below for more details. Couple minor bugfixes. Until
stable, name of the game here is stabilization.
o Major bugfixes (conflux):
- Fix a relay-side assert crash caused by attempts to use a conflux
circuit between circuit close and free, such that no legs were on
the conflux set. Fixed by nulling out the stream's circuit back-
pointer when the last leg is removed. Additional checks and log
messages have been added to detect other cases. Fixes bug 40827;
bugfix on 0.4.8.1-alpha.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on August 04, 2023.
- Regenerate fallback directories generated on July 26, 2023.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2023/07/26.
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2023/08/04.
o Minor features (bridge):
- warn when a bridge is also configure to be an exit relay.
Closes ticket 40819.
o Minor bugfixes (compilation):
- Fix all -Werror=enum-int-mismatch warnings. No behavior change.
Fixes bug 40824; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (protocol warn):
- Wrap a handful of cases where ProtocolWarning logs could emit IP
addresses. Fixes bug 40828; bugfix on 0.3.5.1-alpha.
Changes in version 0.4.8.2-alpha - 2023-07-12
This is our second alpha containing some minor bugfixes and one major bugfix
about L2 vanguard rotation. We believe this will be the last alpha before the
rc in a couple of weeks.
o Major bugfixes (vanguards):
- Rotate to a new L2 vanguard whenever an existing one loses the
Stable or Fast flag. Previously, we would leave these relays in
the L2 vanguard list but never use them, and if all of our
vanguards end up like this we wouldn't have any middle nodes left
to choose from so we would fail to make onion-related circuits.
Fixes bug 40805; bugfix on 0.4.7.1-alpha.
o Minor feature (hs):
- Fix compiler warnings in equix and hashx when building with clang.
Closes ticket 40800.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on July 12, 2023.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2023/07/12.
o Minor bugfix (congestion control):
- Reduce the accepted range of a circuit's negotiated 'cc_sendme_inc'
to be +/- 1 from the consensus parameter value. Fixes bug 40569;
bugfix on 0.4.7.4-alpha.
- Remove unused congestion control algorithms and BDP calculation
code, now that we have settled on and fully tuned Vegas. Fixes bug
40566; bugfix on 0.4.7.4-alpha.
- Update default congestion control parameters to match consensus.
Fixes bug 40709; bugfix on 0.4.7.4-alpha.
o Minor bugfixes (compilation):
- Fix "initializer is not a constant" compilation error that
manifests itself on gcc versions < 8.1 and MSVC. Fixes bug 40773;
bugfix on 0.4.8.1-alpha
o Minor bugfixes (conflux):
- Count leg launch attempts prior to attempting to launch them. This
avoids inifinite launch attempts due to internal circuit building
failures. Additionally, double-check that we have enough exits in
our consensus overall, before attempting to launch conflux sets.
Fixes bug 40811; bugfix on 0.4.8.1-alpha.
- Fix a case where we were resuming reading on edge connections that
were already marked for close. Fixes bug 40801; bugfix
on 0.4.8.1-alpha.
- Fix stream attachment order when creating conflux circuits, so
that stream attachment happens after finishing the full link
handshake, rather than upon set finalization. Fixes bug 40801;
bugfix on 0.4.8.1-alpha.
- Handle legs being closed or destroyed before computing an RTT
(resulting in warns about too many legs). Fixes bug 40810; bugfix
on 0.4.8.1-alpha.
- Remove a "BUG" warning from conflux_pick_first_leg that can be
triggered by broken or malicious clients. Fixes bug 40801; bugfix
on 0.4.8.1-alpha.
o Minor bugfixes (KIST):
- Prevent KISTSchedRunInterval from having values of 0 or 1, neither
of which work properly. Additionally, make a separate
KISTSchedRunIntervalClient parameter, so that the client and relay
KIST values can be set separately. Set the default of both to 2ms.
Fixes bug 40808; bugfix on 0.3.2.1-alpha.
Changes in version 0.4.8.1-alpha - 2023-06-01
This is the first alpha of the 0.4.8.x series. Two major features in this
version which are Conflux and onion service Proof-of-Work (PoW). There are
also many small features in particular, worth noting, the MetricsPort is now
exporting more relay and onion service metrics. Finally, there are
also numerous minor bugfixes included in this version.
o Major features (onion service, proof-of-work):
- Implement proposal 327 (Proof-Of-Work). This is aimed at thwarting
introduction flooding DoS attacks by introducing a dynamic Proof-Of-Work
protocol that occurs over introduction circuits. This introduces several
torrc options prefixed with "HiddenServicePoW" in order to control this
feature. By default, this is disabled. Closes ticket 40634.
o Major features (conflux):
- Implement Proposal 329 (conflux traffic splitting). Conflux splits
traffic across two circuits to Exits that support the protocol.
These circuits are pre-built only, which means that if the pre-
built conflux pool runs out, regular circuits will then be used.
When using conflux circuit pairs, clients choose the lower-latency
circuit to send data to the Exit. When the Exit sends data to the
client, it maximizes throughput, by fully utilizing both circuits
in a multiplexed fashion. Alternatively, clients can request that
the Exit optimize for latency when transmitting to them, by
setting the torrc option 'ConfluxClientUX latency'. Onion services
are not currently supported, but will be in arti. Many other
future optimizations will also be possible using this protocol.
Closes ticket 40593.
o Major features (dirauth):
- Directory authorities and relays now interact properly with
directory authorities if they change addresses. In the past, they
would continue to upload votes, signatures, descriptors, etc to
the hard-coded address in the configuration. Now, if the directory
authority is listed in the consensus at a different address, they
will direct queries to this new address. Implements ticket 40705.
o Minor feature (CI):
- Update CI to use Debian Bullseye for runners.
o Minor feature (client, IPv6):
- Make client able to pick IPv6 relays by default now meaning
ClientUseIPv6 option now defaults to 1. Closes ticket 40785.
o Minor feature (compilation):
- Fix returning something other than "Unknown N/A" as libc version
if we build tor on an O.S. like DragonFlyBSD, FreeBSD, OpenBSD
or NetBSD.
o Minor feature (cpuworker):
- Always use the number of threads for our CPU worker pool to the
number of core available but cap it to a minimum of 2 in case of a
single core. Fixes bug 40713; bugfix on 0.3.5.1-alpha.
o Minor feature (lzma):
- Fix compiler warnings for liblzma >= 5.3.1. Closes ticket 40741.
o Minor feature (MetricsPort, relay):
- Expose time until online keys expires on the MetricsPort. Closes
ticket 40546.
o Minor feature (MetricsPort, relay, onion service):
- Add metrics for the relay side onion service interactions counting
seen cells. Closes ticket 40797. Patch by "friendly73".
o Minor features (directory authorities):
- Directory authorities now include their AuthDirMaxServersPerAddr
config option in the consensus parameter section of their vote.
Now external tools can better predict how they will behave.
Implements ticket 40753.
o Minor features (directory authority):
- Add a new consensus method in which the "published" times on
router entries in a microdesc consensus are all set to a
meaningless fixed date. Doing this will make the download size for
compressed microdesc consensus diffs much smaller. Part of ticket
40130; implements proposal 275.
o Minor features (network documents):
- Clients and relays no longer track the "published on" time
declared for relays in any consensus documents. When reporting
this time on the control port, they instead report a fixed date in
the future. Part of ticket 40130.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on June 01, 2023.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2023/06/01.
o Minor features (hs, metrics):
- Add tor_hs_rend_circ_build_time and tor_hs_intro_circ_build_time
histograms to measure hidden service rend/intro circuit build time
durations. Part of ticket 40757.
o Minor features (metrics):
- Add a `reason` label to the HS error metrics. Closes ticket 40758.
- Add service side metrics for REND and introduction request
failures. Closes ticket 40755.
- Add support for histograms. Part of ticket 40757.
o Minor features (pluggable transports):
- Automatically restart managed Pluggable Transport processes when
their process terminate. Resolves ticket 33669.
o Minor features (portability, compilation):
- Use OpenSSL 1.1 APIs for LibreSSL, fixing LibreSSL 3.5
compatibility. Fixes issue 40630; patch by Alex Xu (Hello71).
o Minor features (relay):
- Do not warn about configuration options that may expose a non-
anonymous onion service. Closes ticket 40691.
o Minor features (relays):
- Trigger OOS when bind fails with EADDRINUSE. This improves
fairness when a large number of exit connections are requested,
and properly signals exhaustion to the network. Fixes issue 40597;
patch by Alex Xu (Hello71).
o Minor features (tests):
- Avoid needless key reinitialization with OpenSSL during unit
tests, saving significant time. Patch from Alex Xu.
o Minor bugfix (relay, logging):
- The wrong max queue cell size was used in a protocol warning
logging statement. Fixes bug 40745; bugfix on 0.4.7.1-alpha.
o Minor bugfixes (logging):
- Avoid ""double-quoting"" strings in several log messages. Fixes
bug 22723; bugfix on 0.1.2.2-alpha.
- Correct a log message when cleaning microdescriptors. Fixes bug
40619; bugfix on 0.2.5.4-alpha.
o Minor bugfixes (metrics):
- Decrement hs_intro_established_count on introduction circuit
close. Fixes bug 40751; bugfix on 0.4.7.12.
o Minor bugfixes (pluggable transports, windows):
- Remove a warning `BUG()` that could occur when attempting to
execute a non-existing pluggable transport on Windows. Fixes bug
40596; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (relay):
- Remove a "BUG" warning for an acceptable race between a circuit
close and considering that circuit active. Fixes bug 40647; bugfix
on 0.3.5.1-alpha.
- Remove a harmless "Bug" log message that can happen in
relay_addr_learn_from_dirauth() on relays during startup. Finishes
fixing bug 40231. Fixes bug 40523; bugfix on 0.4.5.4-rc.
o Minor bugfixes (sandbox):
- Allow membarrier for the sandbox. And allow rt_sigprocmask when
compiled with LTTng. Fixes bug 40799; bugfix on 0.3.5.1-alpha.
- Fix sandbox support on AArch64 systems. More "*at" variants of
syscalls are now supported. Signed 32 bit syscall parameters are
checked more precisely, which should lead to lower likelihood of
breakages with future compiler and libc releases. Fixes bug 40599;
bugfix on 0.4.4.3-alpha.
o Minor bugfixes (state file):
- Avoid a segfault if the state file doesn't contains TotalBuildTimes
along CircuitBuildAbandonedCount being above 0. Fixes bug 40437;
bugfix on 0.3.5.1-alpha.
o Removed features:
- Remove the RendPostPeriod option. This was primarily used in
Version 2 Onion Services and after its deprecation isn't needed
anymore. Closes ticket 40431. Patch by Neel Chauhan.
Changes in version 0.4.7.13 - 2023-01-12
This version contains three major bugfixes, two for relays and one for
client being a security fix, TROVE-2022-002. We have added, for Linux, the
support for IP_BIND_ADDRESS_NO_PORT for relays using OutboundBindAddress.
We strongly recommend to upgrade to this version considering the important
congestion control fix detailed below.
o Major bugfixes (congestion control):
- Avoid incrementing the congestion window when the window is not
fully in use. Thia prevents overshoot in cases where long periods
of low activity would allow our congestion window to grow, and
then get followed by a burst, which would cause queue overload.
Also improve the increment checks for RFC3742. Fixes bug 40732;
bugfix on 0.4.7.5-alpha.
o Major bugfixes (relay):
- When opening a channel because of a circuit request that did not
include an Ed25519 identity, record the Ed25519 identity that we
actually received, so that we can use the channel for other
circuit requests that _do_ list an Ed25519 identity. (Previously
we had code to record this identity, but a logic bug caused it to
be disabled.) Fixes bug 40563; bugfix on 0.3.0.1-alpha. Patch
from "cypherpunks".
o Major bugfixes (TROVE-2022-002, client):
- The SafeSocks option had its logic inverted for SOCKS4 and
SOCKS4a. It would let the unsafe SOCKS4 pass but not the safe
SOCKS4a one. This is TROVE-2022-002 which was reported on
Hackerone by "cojabo". Fixes bug 40730; bugfix on 0.3.5.1-alpha.
o Minor feature (authority):
- Reject 0.4.6.x series at the authority level. Closes ticket 40664.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on January 12, 2023.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2023/01/12.
o Minor features (relays):
- Set the Linux-specific IP_BIND_ADDRESS_NO_PORT option on outgoing
sockets, allowing relays using OutboundBindAddress to make more
outgoing connections than ephemeral ports, as long as they are to
separate destinations. Related to issue 40597; patch by Alex
Xu (Hello71).
o Minor bugfixes (relay, metrics):
- Fix typo in a congestion control label on the MetricsPort. Fixes
bug 40727; bugfix on 0.4.7.12.
o Minor bugfixes (sandbox, authority):
- With the sandbox enabled, allow to write "my-consensus-
{ns|microdesc}" and to rename them as well. Fixes bug 40729;
bugfix on 0.3.5.1-alpha.
o Code simplifications and refactoring:
- Rely on actual error returned by the kernel when choosing what
resource exhaustion to log. Fixes issue 40613; Fix
on tor-0.4.6.1-alpha.
Changes in version 0.4.5.16 - 2023-01-12
This version has one major bugfix for relay and a security fix,
TROVE-2022-002, affecting clients. We strongly recommend to upgrade to our
0.4.7.x stable series. As a reminder, this series is EOL on February 15th,
2023.
o Major bugfixes (relay):
- When opening a channel because of a circuit request that did not
include an Ed25519 identity, record the Ed25519 identity that we
actually received, so that we can use the channel for other
circuit requests that _do_ list an Ed25519 identity. (Previously
we had code to record this identity, but a logic bug caused it to
be disabled.) Fixes bug 40563; bugfix on 0.3.0.1-alpha. Patch
from "cypherpunks".
o Major bugfixes (TROVE-2022-002, client):
- The SafeSocks option had its logic inverted for SOCKS4 and
SOCKS4a. It would let the unsafe SOCKS4 pass but not the safe
SOCKS4a one. This is TROVE-2022-002 which was reported on
Hackerone by "cojabo". Fixes bug 40730; bugfix on 0.3.5.1-alpha.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on January 12, 2023.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2023/01/12.
Changes in version 0.4.7.12 - 2022-12-06
This version contains a major change that is a new key for moria1. Also, new
metrics are exported on the MetricsPort for the congestion control
subsystem.
o Directory authority changes (moria1):
- Rotate the relay identity key and v3 identity key for moria1. They
have been online for more than a decade and refreshing keys
periodically is good practice. Advertise new ports too, to avoid
confusion. Closes ticket 40722.
o Minor feature (Congestion control metrics):
- Add additional metricsport relay metrics for congestion control.
Closes ticket 40724.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on December 06, 2022.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2022/12/06.
o Minor bugfixes (cpuworker, relay):
- Fix an off by one overload calculation on the number of CPUs being
used by our thread pool. Fixes bug 40719; bugfix on 0.3.5.1-alpha.
Changes in version 0.4.5.15 - 2022-12-06
This version has several major changes for directory authorities. And a
major bugfix on OSX. Again, we strongly recommend to upgrade to our 0.4.7.x
series latest stable. This series is EOL on February 15th, 2023.
o Directory authority changes (dizum):
- Change dizum IP address. Closes ticket 40687.
o Directory authority changes (Faravahar):
- Remove Faravahar until its operator, Sina, set it back up online
outside of Team Cymru network. Closes ticket 40688.
o Directory authority changes (moria1):
- Rotate the relay identity key and v3 identity key for moria1. They
have been online for more than a decade and refreshing keys
periodically is good practice. Advertise new ports too, to avoid
confusion. Closes ticket 40722.
o Major bugfixes (OSX):
- Fix coarse-time computation on Apple platforms (like Mac M1) where
the Mach absolute time ticks do not correspond directly to
nanoseconds. Previously, we computed our shift value wrong, which
led us to give incorrect timing results. Fixes bug 40684; bugfix
on 0.3.3.1-alpha.
o Major bugfixes (relay):
- Improve security of our DNS cache by randomly clipping the TTL
value. TROVE-2021-009. Fixes bug 40674; bugfix on 0.3.5.1-alpha.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on December 06, 2022.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2022/12/06.
Changes in version 0.4.7.11 - 2022-11-10
This version contains several major fixes aimed at helping defend against
network denial of service. It is also extending drastically the MetricsPort
for relays to help us gather more internal data to investigate performance
and attacks.
We strongly recommend to upgrade to this version especially for Exit relays
in order to help the network defend against this ongoing DDoS.
o Directory authority changes (dizum, Faravahar):
- Change dizum IP address. Closes ticket 40687.
- Remove Faravahar until its operator, Sina, set it back up online
outside of Team Cymru network. Closes ticket 40688.
o Major bugfixes (geoip data):
- IPFire informed us on August 12th that databases generated after
(including) August 10th did not have proper ARIN network
allocations. We are updating the database to use the one generated
on August 9th, 2022. Fixes bug 40658; bugfix on 0.4.5.13.
o Major bugfixes (onion service):
- Set a much higher circuit build timeout for opened client rendezvous
circuit. Before this, tor would time them out very quickly leading to
unnecessary retries meaning more load on the network. Fixes bug 40694;
bugfix on 0.3.5.1-alpha.
o Major bugfixes (OSX):
- Fix coarse-time computation on Apple platforms (like Mac M1) where
the Mach absolute time ticks do not correspond directly to
nanoseconds. Previously, we computed our shift value wrong, which
led us to give incorrect timing results. Fixes bug 40684; bugfix
on 0.3.3.1-alpha.
o Major bugfixes (relay):
- Improve security of our DNS cache by randomly clipping the TTL
value. TROVE-2021-009. Fixes bug 40674; bugfix on 0.3.5.1-alpha.
o Minor feature (Mac and iOS build):
- Change how combine_libs works on Darwin like platforms to make
sure we don't include any `__.SYMDEF` and `__.SYMDEF SORTED`
symbols on the archive before we repack and run ${RANLIB} on the
archive. This fixes a build issue with recent Xcode versions on
Mac Silicon and iOS. Closes ticket 40683.
o Minor feature (metrics):
- Add various congestion control counters to the MetricsPort. Closes
ticket 40708.
o Minor feature (performance):
- Bump the maximum amount of CPU that can be used from 16 to 128. Note
that NumCPUs torrc option overrides this hardcoded maximum. Fixes bug
40703; bugfix on 0.3.5.1-alpha.
o Minor feature (relay):
- Make an hardcoded value for the maximum of per CPU tasks into a
consensus parameter.
- Two new consensus parameters are added to control the wait time in
queue of the onionskins. One of them is the torrc
MaxOnionQueueDelay options which supersedes the consensus
parameter. Closes ticket 40704.
o Minor feature (relay, DoS):
- Apply circuit creation anti-DoS defenses if the outbound circuit
max cell queue size is reached too many times. This introduces two
new consensus parameters to control the queue size limit and
number of times allowed to go over that limit. Closes ticket 40680.
o Minor feature (relay, metrics):
- Add DoS defenses counter to MetricsPort.
- Add congestion control RTT reset counter to MetricsPort.
- Add counters to the MetricsPort how many connections, per type,
are currently opened and how many were created.
- Add relay flags from the consensus to the MetricsPort.
- Add total number of opened circuits to MetricsPort.
- Add total number of streams seen by an Exit to the MetricsPort.
- Add traffic stats as in number of read/written bytes in total.
- Related to ticket 40194.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on November 10, 2022.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2022/11/10.
o Minor bugfixes (authorities, sandbox):
- Allow to write file my-consensus-<flavor-name> to disk when
sandbox is activated. Fixes bug 40663; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (dirauth):
- Directory authorities stop voting a consensus "Measured" weight
for relays with the Authority flag. Now these relays will be
considered unmeasured, which should reserve their bandwidth for
their dir auth role and minimize distractions from other roles. In
place of the "Measured" weight, they now include a
"MeasuredButAuthority" weight (not used by anything) so the
bandwidth authority's opinion on this relay can be recorded for
posterity. Lastly, remove the AuthDirDontVoteOnDirAuthBandwidth
torrc option which never worked right. Fixes bugs 40698 and 40700;
bugfix on 0.4.7.2-alpha.
o Minor bugfixes (onion service client):
- A collapsing onion service circuit should be seen as an
"unreachable" error so it can be retried. Fixes bug 40692; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (onion service):
- Make the service retry a rendezvous if the circuit is being
repurposed for measurements. Fixes bug 40696; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (relay overload statistics):
- Count total create cells vs dropped create cells properly, when
assessing if our fraction of dropped cells is too high. We only
count non-client circuits in the denominator, but we would include
client circuits in the numerator, leading to surprising log lines
claiming that we had dropped more than 100% of incoming create
cells. Fixes bug 40673; bugfix on 0.4.7.1-alpha.
o Code simplification and refactoring (bridges):
- Remove unused code related to ExtPort connection ID. Fixes bug
40648; bugfix on 0.3.5.1-alpha.
Changes in version 0.4.7.10 - 2022-08-12
This version updates the geoip cache that we generate from IPFire location
database to use the August 9th, 2022 one. Everyone MUST update to this
latest release else circuit path selection and relay metrics are badly
affected.
o Major bugfixes (geoip data):
- IPFire informed us on August 12th that databases generated after
(including) August 10th did not have proper ARIN network allocations. We
are updating the database to use the one generated on August 9th, 2022.
Fixes bug 40658; bugfix on 0.4.7.9.
Changes in version 0.4.6.12 - 2022-08-12
This version updates the geoip cache that we generate from IPFire location
database to use the August 9th, 2022 one. Everyone MUST update to this
latest release else circuit path selection and relay metrics are badly
affected.
o Major bugfixes (geoip data):
- IPFire informed us on August 12th that databases generated after
(including) August 10th did not have proper ARIN network allocations. We
are updating the database to use the one generated on August 9th, 2022.
Fixes bug 40658; bugfix on 0.4.6.11.
Changes in version 0.4.5.14 - 2022-08-12
This version updates the geoip cache that we generate from IPFire location
database to use the August 9th, 2022 one. Everyone MUST update to this
latest release else circuit path selection and relay metrics are badly
affected.
o Major bugfixes (geoip data):
- IPFire informed us on August 12th that databases generated after
(including) August 10th did not have proper ARIN network allocations. We
are updating the database to use the one generated on August 9th, 2022.
Fixes bug 40658; bugfix on 0.4.5.13.
Changes in version 0.4.7.9 - 2022-08-11
This version contains several major fixes aimed at reducing memory pressure on
relays and possible side-channel. It also contains a major bugfix related to
congestion control also aimed at reducing memory pressure on relays.
Finally, there is last one major bugfix related to Vanguard L2 layer node
selection.
We strongly recommend to upgrade to this version especially for Exit relays
in order to help the network defend against this ongoing DDoS.
o Major bugfixes (congestion control):
- Implement RFC3742 Limited Slow Start. Congestion control was
overshooting the congestion window during slow start, particularly
for onion service activity. With this fix, we now update the
congestion window more often during slow start, as well as dampen
the exponential growth when the congestion window grows above a
capping parameter. This should reduce the memory increases guard
relays were seeing, as well as allow us to set lower queue limits
to defend against ongoing DoS attacks. Fixes bug 40642; bugfix
on 0.4.7.5-alpha.
o Major bugfixes (relay):
- Remove OR connections btrack subsystem entries when the connections
close normally. Before this, we would only remove the entry on error and
thus leaking memory for each normal OR connections. Fixes bug 40604;
bugfix on 0.4.0.1-alpha.
- Stop sending TRUNCATED cell and instead close the circuit from which we
received a DESTROY cell. This makes every relay in the circuit path to
stop queuing cells. Fixes bug 40623; bugfix on 0.1.0.2-rc.
o Major bugfixes (vanguards):
- We had omitted some checks for whether our vanguards (second layer
guards from proposal 333) overlapped. Now make sure to pick each
of them to be independent. Also, change the design to allow them
to come from the same family. Fixes bug 40639; bugfix
on 0.4.7.1-alpha.
o Minor features (dirauth):
- Add a torrc option to control the Guard flag bandwidth threshold
percentile. Closes ticket 40652.
- Add an AuthDirVoteGuard torrc option that can allow authorities to
assign the Guard flag to the given fingerprints/country code/IPs.
This is a needed feature mostly for defense purposes in case a DoS
hits the network and relay start losing the Guard flags too fast.
- Make UPTIME_TO_GUARANTEE_STABLE, MTBF_TO_GUARANTEE_STABLE,
TIME_KNOWN_TO_GUARANTEE_FAMILIAR WFU_TO_GUARANTEE_GUARD tunable
from torrc.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on August 11, 2022.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2022/08/11.
o Minor bugfixes (congestion control):
- Add a check for an integer underflow condition that might happen
in cases where the system clock is stopped, the ORconn is blocked,
and the endpoint sends more than a congestion window worth of non-
data control cells at once. This would cause a large congestion
window to be calculated instead of a small one. No security
impact. Fixes bug 40644; bugfix on 0.4.7.5-alpha.
o Minor bugfixes (defense in depth):
- Change a test in the netflow padding code to make it more
_obviously_ safe against remotely triggered crashes. (It was safe
against these before, but not obviously so.) Fixes bug 40645;
bugfix on 0.3.1.1-alpha.
o Minor bugfixes (relay):
- Do not propagate either forward or backward a DESTROY remote reason when
closing a circuit in order to avoid a possible side channel. Fixes bug
40649; bugfix on 0.1.2.4-alpha.
Changes in version 0.4.6.11 - 2022-08-11
This version contains two major fixes aimed at reducing memory pressure on
relays and possible side-channel. The rest of the fixes were backported for
stability or safety purposes.
This is the very LAST version of this series. As of August 1st 2022, it is
end-of-life (EOL). We thus strongly recommend to upgrade to the latest
stable of the 0.4.7.x series.
o Major bugfixes (relay):
- Remove OR connections btrack subsystem entries when the connections
close normally. Before this, we would only remove the entry on error and
thus leaking memory for each normal OR connections. Fixes bug 40604;
bugfix on 0.4.0.1-alpha.
- Stop sending TRUNCATED cell and instead close the circuit from which we
received a DESTROY cell. This makes every relay in the circuit path to
stop queuing cells. Fixes bug 40623; bugfix on 0.1.0.2-rc.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on August 11, 2022.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2022/08/11.
o Minor features (linux seccomp2 sandbox):
- Permit the clone3 syscall, which is apparently used in glibc-2.34
and later. Closes ticket 40590.
o Minor bugfixes (controller, path bias):
- When a circuit's path is specified, in full or in part, from the
controller API, do not count that circuit towards our path-bias
calculations. (Doing so was incorrect, since we cannot tell
whether the controller is selecting relays randomly.) Resolves a
"Bug" warning. Fixes bug 40515; bugfix on 0.2.4.10-alpha.
o Minor bugfixes (defense in depth):
- Change a test in the netflow padding code to make it more
_obviously_ safe against remotely triggered crashes. (It was safe
against these before, but not obviously so.) Fixes bug 40645;
bugfix on 0.3.1.1-alpha.
o Minor bugfixes (linux seccomp2 sandbox):
- Allow the rseq system call in the sandbox. This solves a crash
issue with glibc 2.35 on Linux. Patch from pmu-ipf. Fixes bug
40601; bugfix on 0.3.5.11.
o Minor bugfixes (metrics port, onion service):
- The MetricsPort line for an onion service with multiple ports are now
unique that is one line per port. Before this, all ports of an onion
service would be on the same line which violates the Prometheus rules of
unique labels. Fixes bug 40581; bugfix on 0.4.5.1-alpha.
o Minor bugfixes (onion service, client):
- Fix a fatal assert due to a guard subsystem recursion triggered by
the onion service client. Fixes bug 40579; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (performance, DoS):
- Fix one case of a not-especially viable denial-of-service attack
found by OSS-Fuzz in our consensus-diff parsing code. This attack
causes a lot small of memory allocations and then immediately
frees them: this is only slow when running with all the sanitizers
enabled. Fixes one case of bug 40472; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (relay):
- Do not propagate either forward or backward a DESTROY remote reason when
closing a circuit in order to avoid a possible side channel. Fixes bug
40649; bugfix on 0.1.2.4-alpha.
Changes in version 0.4.5.13 - 2022-08-11
This version contains two major fixes aimed at reducing memory pressure on
relays and possible side-channel. The rest of the fixes were backported for
stability or safety purposes. We strongly recommend to upgrade your relay to
this version or, ideally, to the latest stable of the 0.4.7.x series.
o Major bugfixes (relay):
- Remove OR connections btrack subsystem entries when the connections
close normally. Before this, we would only remove the entry on error and
thus leaking memory for each normal OR connections. Fixes bug 40604;
bugfix on 0.4.0.1-alpha.
- Stop sending TRUNCATED cell and instead close the circuit from which we
received a DESTROY cell. This makes every relay in the circuit path to
stop queuing cells. Fixes bug 40623; bugfix on 0.1.0.2-rc.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on August 11, 2022.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2022/08/11.
o Minor features (linux seccomp2 sandbox):
- Permit the clone3 syscall, which is apparently used in glibc-2.34
and later. Closes ticket 40590.
o Minor bugfixes (controller, path bias):
- When a circuit's path is specified, in full or in part, from the
controller API, do not count that circuit towards our path-bias
calculations. (Doing so was incorrect, since we cannot tell
whether the controller is selecting relays randomly.) Resolves a
"Bug" warning. Fixes bug 40515; bugfix on 0.2.4.10-alpha.
o Minor bugfixes (defense in depth):
- Change a test in the netflow padding code to make it more
_obviously_ safe against remotely triggered crashes. (It was safe
against these before, but not obviously so.) Fixes bug 40645;
bugfix on 0.3.1.1-alpha.
o Minor bugfixes (linux seccomp2 sandbox):
- Allow the rseq system call in the sandbox. This solves a crash
issue with glibc 2.35 on Linux. Patch from pmu-ipf. Fixes bug
40601; bugfix on 0.3.5.11.
o Minor bugfixes (metrics port, onion service):
- The MetricsPort line for an onion service with multiple ports are now
unique that is one line per port. Before this, all ports of an onion
service would be on the same line which violates the Prometheus rules of
unique labels. Fixes bug 40581; bugfix on 0.4.5.1-alpha.
o Minor bugfixes (onion service, client):
- Fix a fatal assert due to a guard subsystem recursion triggered by
the onion service client. Fixes bug 40579; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (performance, DoS):
- Fix one case of a not-especially viable denial-of-service attack
found by OSS-Fuzz in our consensus-diff parsing code. This attack
causes a lot small of memory allocations and then immediately
frees them: this is only slow when running with all the sanitizers
enabled. Fixes one case of bug 40472; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (relay):
- Do not propagate either forward or backward a DESTROY remote reason when
closing a circuit in order to avoid a possible side channel. Fixes bug
40649; bugfix on 0.1.2.4-alpha.
Changes in version 0.4.7.8 - 2022-06-17
This version fixes several bugfixes including a High severity security issue
categorized as a Denial of Service. Everyone running an earlier version
should upgrade to this version.
o Major bugfixes (congestion control, TROVE-2022-001):
- Fix a scenario where RTT estimation can become wedged, seriously
degrading congestion control performance on all circuits. This
impacts clients, onion services, and relays, and can be triggered
remotely by a malicious endpoint. Tracked as CVE-2022-33903. Fixes
bug 40626; bugfix on 0.4.7.5-alpha.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on June 17, 2022.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2022/06/17.
o Minor bugfixes (linux seccomp2 sandbox):
- Allow the rseq system call in the sandbox. This solves a crash
issue with glibc 2.35 on Linux. Patch from pmu-ipf. Fixes bug
40601; bugfix on 0.3.5.11.
o Minor bugfixes (logging):
- Demote a harmless warn log message about finding a second hop to
from warn level to info level, if we do not have enough
descriptors yet. Leave it at notice level for other cases. Fixes
bug 40603; bugfix on 0.4.7.1-alpha.
- Demote a notice log message about "Unexpected path length" to info
level. These cases seem to happen arbitrarily, and we likely will
never find all of them before the switch to arti. Fixes bug 40612;
bugfix on 0.4.7.5-alpha.
o Minor bugfixes (relay, logging):
- Demote a harmless XOFF log message to from notice level to info
level. Fixes bug 40620; bugfix on 0.4.7.5-alpha.
Changes in version 0.4.7.7 - 2022-04-27
This is the first stable version of the 0.4.7.x series. This series includes
several major bugfixes from previous series and one massive new feature:
congestion control.
Congestion control should improve traffic speed and stability on the network
once a majority of Exit upgrade. You can find more details about it in
proposal 324 in the torspec.git repository.
For a complete list of changes since 0.4.6.10, see the ReleaseNotes file.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on April 27, 2022.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2022/04/27.
o Minor bugfixes (congestion control, client side logs):
- Demote a warn about 1-hop circuits using congestion control down to
info; Demote the 4-hop case to notice. Fixes bug 40598; bugfix on
0.4.5-alpha.
Changes in version 0.4.7.6-rc - 2022-04-07
This is the first release candidate of the 0.4.7.x series. Only one minor
bugfix went in since the last alpha couple weeks ago. We strongly recommend
anyone running an alpha version to upgrade to this version. Unless major
problems are found, the next release will finally be the stable!
o Minor features (fallbackdir):
- Regenerate fallback directories generated on April 07, 2022.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2022/04/07.
o Minor features (linux seccomp2 sandbox):
- Permit the clone3 syscall, which is apparently used in glibc-2.34
and later. Closes ticket 40590.
Changes in version 0.4.7.5-alpha - 2022-03-25
This version contains, of what we hope, the final work for congestion
control paving the way to the stable version. We expect this to be the last
alpha version of the 0.4.7.x series. Mostly minor bugfixes except one major
bugfix that changes how Tor behaves with DNS timeouts for Exit relays. As
always with an alpha, we recommend all relay operators to upgrade from
previous alpha to this one.
o Major bugfixes (onion service, congestion control):
- Fix the onion service upload case where the congestion control
parameters were not added to the right object. Fixes bug 40586;
bugfix on 0.4.7.4-alpha.
o Major bugfixes (relay, DNS):
- Lower the DNS timeout from 3 attempts at 5 seconds each to 2
attempts at 1 seconds each. Two new consensus parameters were
added to control these values. This change should improve observed
performance under DNS load; see ticket for more details. Fixes bug
40312; bugfix on 0.3.5.1-alpha.
o Minor features (control port):
- Provide congestion control fields on CIRC_BW and STREAM control
port events, for use by sbws. Closes ticket 40568.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on March 25, 2022.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2022/03/25.
o Minor bugfixes (DNSPort, dormant mode):
- A request on the DNSPort now wakes up a dormant tor. Fixes bug
40577; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (metrics port, onion service):
- Fix the metrics with a port label to be unique. Before this, all
ports of an onion service would be on the same line which violates
the Prometheus rules of unique labels. Fixes bug 40581; bugfix
on 0.4.5.1-alpha.
o Minor bugfixes (onion service congestion control):
- Avoid a non-fatal assertion failure in the case where we fail to
set up congestion control on a rendezvous circuit. This could
happen naturally if a cache entry expired at an unexpected time.
Fixes bug 40576; bugfix on 0.4.7.4-alpha.
o Minor bugfixes (onion service, client):
- Fix a rare but fatal assertion failure due to a guard subsystem
recursion triggered by the onion service client. Fixes bug 40579;
bugfix on 0.3.5.1-alpha.
o Minor bugfixes (relay, overload):
- Decide whether to signal overload based on a fraction and
assessment period of ntor handshake drops. Previously, a single
drop could trigger an overload state, which caused many false
positives. Fixes bug 40560; bugfix on 0.4.7.1-alpha.
Changes in version 0.4.7.4-alpha - 2022-02-25
This version contains the negotiation congestion control work which is the
final part needed before going stable. There are also various bugfixes
including two major ones detailed below. Last, the Exit notice page layout
has been modernized but the text is unchanged. We recommend that all relay
operators running any previous alpha upgrade to this one.
o Major features (relay, client, onion services):
- Implement RTT-based congestion control for exits and onion
services, from Proposal 324. Disabled by default. Enabled by the
'cc_alg' consensus parameter. Closes ticket 40444.
o Major bugfixes (client):
- Stop caching TCP connect failures to relays/bridges when we
initiated the connection as a client. Now we only cache connect
failures as a relay or bridge when we initiated them because of an
EXTEND request. Declining to re-attempt the client-based
connections could cause problems when we lose connectivity and try
to reconnect. Fixes bug 40499; bugfix on 0.3.3.4-alpha.
o Major bugfixes (relay, overload):
- Do not trigger a general overload on DNS timeout. Even after
fixing 40527, some code remained that triggered the overload.
Fixes bug 40564; bugfix on 0.4.7.1-alpha.
o Minor feature (authority, relay):
- Reject End-Of-Life relays running version 0.3.5.x. Closes
ticket 40559.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on February 25, 2022.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2022/02/25.
o Minor bugfix (logging):
- Update a log notice dead URL to a working one. Fixes bug 40544;
bugfix on 0.3.5.1-alpha.
o Minor bugfix (relay):
- Remove the HSDir and HSIntro onion service v2 protocol versions so
relay stop advertising that they support them. Fixes bug 40509;
bugfix on 0.3.5.17.
o Minor bugfixes (cell scheduling):
- Avoid writing empty payload with NSS write.
- Don't attempt to write 0 bytes after a cell scheduling loop. No
empty payload was put on the wire. Fixes bug 40548; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (compilation):
- Resume being able to build on old / esoteric gcc versions. Fixes
bug 40550; bugfix on 0.4.7.1-alpha.
o Minor bugfixes (compiler warnings):
- Fix couple compiler warnings on latest Ubuntu Jammy. Fixes bug
40516; bugfix on 0.3.5.1-alpha.
o Documentation:
- Provide an improved version of the tor-exit-notice.html file for
exit relays to use as a landing page. The text is unchanged, but
the page design and layout are significantly modernized, and
several links are fixed. Patch from "n_user"; closes ticket 40529.
Changes in version 0.4.6.10 - 2022-02-04
This version contains minor bugfixes but one in particular is that relays
don't advertise onion service v2 support at the protocol version level.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on February 04, 2022.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2022/02/04.
o Minor bugfix (logging):
- Update a log notice dead URL to a working one. Fixes bug 40544;
bugfix on 0.3.5.1-alpha.
o Minor bugfix (relay):
- Remove the HSDir and HSIntro onion service v2 protocol versions so
relay stop advertising that they support them. Fixes bug 40509;
bugfix on 0.3.5.17.
o Minor bugfixes (MetricsPort, Prometheus):
- Add double quotes to the label values of the onion service
metrics. Fixes bug 40552; bugfix on 0.4.5.1-alpha.
Changes in version 0.4.5.12 - 2022-02-04
This version contains mostly minor bugfixes for which you can find the
details below. The previous release (0.4.5.11) was suppose to update the
GeoIP and fallbackdir lists but a problem in our release pipeline prevented
those files to be updated correctly. Thus, this release regenerates up to
date lists. Furthermore, another fix to highlight is that relays don't
advertise onion service v2 support at the protocol version level.
o Minor feature (reproducible build):
- The repository can now build reproducible tarballs which adds the
build command "make dist-reprod" for that purpose. Closes
ticket 26299.
o Minor features (compilation):
- Give an error message if trying to build with a version of
LibreSSL known not to work with Tor. (There's an incompatibility
with LibreSSL versions 3.2.1 through 3.4.0 inclusive because of
their incompatibility with OpenSSL 1.1.1's TLSv1.3 APIs.) Closes
ticket 40511.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on February 04, 2022.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2022/02/04.
o Minor bugfix (logging):
- Update a log notice dead URL to a working one. Fixes bug 40544;
bugfix on 0.3.5.1-alpha.
o Minor bugfix (relay):
- Remove the HSDir and HSIntro onion service v2 protocol versions so
relay stop advertising that they support them. Fixes bug 40509;
bugfix on 0.3.5.17.
o Minor bugfixes (compilation):
- Fix a compilation error when trying to build Tor with a compiler
that does not support expanding statically initialized const
values in macro's. Fixes bug 40410; bugfix on 0.4.5.1-alpha
- Fix our configuration logic to detect whether we had OpenSSL 3:
previously, our logic was reversed. This has no other effect than
to change whether we suppress deprecated API warnings. Fixes bug
40429; bugfix on 0.3.5.13.
o Minor bugfixes (MetricsPort, Prometheus):
- Add double quotes to the label values of the onion service
metrics. Fixes bug 40552; bugfix on 0.4.5.1-alpha.
o Minor bugfixes (relay):
- Reject IPv6-only DirPorts. Our reachability self-test forces
DirPorts to be IPv4, but our configuration parser allowed them to
be IPv6-only, which led to an assertion failure. Fixes bug 40494;
bugfix on 0.4.5.1-alpha.
Changes in version 0.4.7.3-alpha - 2021-12-15
This third alpha release of the 0.4.7.x series fixes several bugs including
two major ones affecting Bridges and Relays (see below). If you are running
an earlier 0.4.7.x version, you should upgrade to this version.
o Major bugfixes (bridges):
- Make Tor work reliably again when you have multiple bridges
configured and one or more of them are unreachable. The problem
came because we require that we have bridge descriptors for both
of our first two bridges (else we refuse to try to connect), but
in some cases we would wait three hours before trying to fetch
these missing descriptors, and/or never recover when we do try to
fetch them. Fixes bugs 40396 and 40495; bugfix on 0.3.0.5-rc
and 0.3.2.1-alpha.
o Major bugfixes (relay, overload):
- Change the MetricsPort DNS "timeout" label to be "tor_timeout" in
order to indicate that this was a DNS timeout from tor perspective
and not the DNS server itself.
- Deprecate overload_dns_timeout_period_secs and
overload_dns_timeout_scale_percent consensus parameters as well.
They were used to assess the overload state which is no more now.
- Don't make Tor DNS timeout trigger an overload general state.
These timeouts are different from DNS server timeout. They have to
be seen as timeout related to UX and not because of a network
problem. Fixes bug 40527; bugfix on 0.4.6.1-alpha.
o Minor feature (reproducible build):
- The repository can now build reproducible tarballs which adds the
build command "make dist-reprod" for that purpose. Closes
ticket 26299.
o Minor features (compilation):
- Give an error message if trying to build with a version of
LibreSSL known not to work with Tor. (There's an incompatibility
with LibreSSL versions 3.2.1 through 3.4.0 inclusive because of
their incompatibility with OpenSSL 1.1.1's TLSv1.3 APIs.) Closes
ticket 40511.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on December 15, 2021.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2021/12/15.
o Minor features (portability):
- Try to prevent a compiler warning about printf arguments that
could sometimes occur on MSYS2 depending on the configuration.
Closes ticket 40355.
o Minor bugfix (pluggable transport):
- Do not kill a managed proxy if one of its transport configurations
emits a method error. Instead log a warning and continue processing
method arguments. Fixes bug 7362; bugfix on 0.2.3.6-alpha.
o Minor bugfixes (bridges):
- When we don't yet have a descriptor for one of our bridges,
disable the entry guard retry schedule on that bridge. The entry
guard retry schedule and the bridge descriptor retry schedule can
conflict, e.g. where we mark a bridge as "maybe up" yet we don't
try to fetch its descriptor yet, leading Tor to wait (refusing to
do anything) until it becomes time to fetch the descriptor. Fixes
bug 40497; bugfix on 0.3.0.3-alpha.
o Minor bugfixes (compilation):
- Fix our configuration logic to detect whether we had OpenSSL 3:
previously, our logic was reversed. This has no other effect than
to change whether we suppress deprecated API warnings. Fixes bug
40429; bugfix on 0.3.5.13.
o Minor bugfixes (controller, path bias):
- When a circuit's path is specified, in full or in part, from the
controller API, do not count that circuit towards our path-bias
calculations. (Doing so was incorrect, since we cannot tell
whether the controller is selecting relays randomly.) Resolves a
"Bug" warning. Fixes bug 40515; bugfix on 0.2.4.10-alpha.
o Minor bugfixes (logging):
- When we no longer have enough directory information to use the
network, we would log a notice-level message -- but we would not
reliably log a message when we recovered and resumed using the
network. Now make sure there is always a corresponding message
about recovering. Fixes bug 40496; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (performance, DoS):
- Fix one case of a not-especially viable denial-of-service attack
found by OSS-Fuzz in our consensus-diff parsing code. This attack
causes a lot small of memory allocations and then immediately
frees them: this is only slow when running with all the sanitizers
enabled. Fixes one case of bug 40472; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (relay):
- Reject IPv6-only DirPorts. Our reachability self-test forces
DirPorts to be IPv4, but our configuration parser allowed them to
be IPv6-only, which led to an assertion failure. Fixes bug 40494;
bugfix on 0.4.5.1-alpha.
o Minor bugfixes (sandbox):
- Fix the sandbox on i386 by modifying it to allow the
"clock_gettime64" and "statx" system calls and to filter the
"chown32" and "stat64" system calls in place of "chown" and
"stat", respectively. Fixes bug 40505; bugfix on 0.2.5.4-alpha.
o Documentation (man, relay):
- Missing "OverloadStatistics" in tor.1 manpage. Fixes bug 40504;
bugfix on 0.4.6.1-alpha.
Changes in version 0.4.6.9 - 2021-12-15
This version fixes several bugs from earlier versions of Tor. One important
piece is the removal of DNS timeout metric from the overload general signal.
See below for more details.
o Major bugfixes (relay, overload):
- Don't make Tor DNS timeout trigger an overload general state.
These timeouts are different from DNS server timeout. They have to
be seen as timeout related to UX and not because of a network
problem. Fixes bug 40527; bugfix on 0.4.6.1-alpha.
o Minor feature (reproducible build):
- The repository can now build reproducible tarballs which adds the
build command "make dist-reprod" for that purpose. Closes
ticket 26299.
o Minor features (compilation):
- Give an error message if trying to build with a version of
LibreSSL known not to work with Tor. (There's an incompatibility
with LibreSSL versions 3.2.1 through 3.4.0 inclusive because of
their incompatibility with OpenSSL 1.1.1's TLSv1.3 APIs.) Closes
ticket 40511.
o Minor features (fallbackdir):
- Regenerate fallback directories generated on December 15, 2021.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2021/12/15.
o Minor bugfixes (compilation):
- Fix our configuration logic to detect whether we had OpenSSL 3:
previously, our logic was reversed. This has no other effect than
to change whether we suppress deprecated API warnings. Fixes bug
40429; bugfix on 0.3.5.13.
o Minor bugfixes (relay):
- Reject IPv6-only DirPorts. Our reachability self-test forces
DirPorts to be IPv4, but our configuration parser allowed them to
be IPv6-only, which led to an assertion failure. Fixes bug 40494;
bugfix on 0.4.5.1-alpha.
o Documentation (man, relay):
- Missing "OverloadStatistics" in tor.1 manpage. Fixes bug 40504;
bugfix on 0.4.6.1-alpha.
Changes in version 0.4.7.2-alpha - 2021-10-26
This second alpha release of the 0.4.7.x series adds two major
features: congestion control (prop324) for network performance, and
the MiddleOnly flag (prop335) voted by the authorities to pin relays
to the middle position for various network health reasons. This
release also fixes numerous bugs.
The congestion control feature, detailed in proposal 324, still needs
more work before we can enable it by default. It is currently in its
testing and tuning phase which means that you should expect more
0.4.7.x alphas as congestion control gets stabilized and tuned for
optimal performance. And so, at this release, it can not be used
without a custom patch.
o Major features (congestion control):
- Implement support for flow control over congestion controlled
circuits. This work comes from proposal 324. Closes ticket 40450.
o Major features (directory authority):
- Add a new consensus method to handle MiddleOnly specially. When
enough authorities are using this method, then any relay tagged
with the MiddleOnly flag will have its Exit, Guard, HSDir, and
V2Dir flags automatically cleared, and will have its BadExit flag
automatically set. Implements part of proposal 335.
- Authorities can now be configured to label relays as "MiddleOnly".
When voting for this flag, authorities automatically vote against
Exit, Guard, HSDir, and V2Dir; and in favor of BadExit. Implements
part of proposal 335. Based on a patch from Neel Chauhan.
o Major bugfix (relay, metrics):
- On the MetricsPort, the DNS error statistics are not reported by
record type ("record=...") anymore due to a libevent bug
(https://github.com/libevent/libevent/issues/1219). Fixes bug
40490; bugfix on 0.4.7.1-alpha.
o Major bugfixes (relay, overload state):
- Relays report the general overload state for DNS timeout errors
only if X% of all DNS queries over Y seconds are errors. Before
that, it only took 1 timeout to report the overload state which
was just too low of a threshold. The X and Y values are 1% and 10
minutes respectively but they are also controlled by consensus
parameters. Fixes bug 40491; bugfix on 0.4.6.1-alpha.
o Minor feature (authority, relay):
- Reject End-Of-Life relays running version 0.4.2.x, 0.4.3.x,
0.4.4.x and 0.4.5 alphas/rc. Closes ticket 40480.
o Minor feature (onion service v2):
- Onion service v2 addresses are now not recognized anymore by tor
meaning a bad hostname is returned when attempting to pass it on a
SOCKS connection. No more deprecation log is emitted client side.
Closes ticket 40476.
- See https://blog.torproject.org/v2-deprecation-timeline for
details on how to transition from v2 to v3.
o Minor features (fallbackdir):
- Regenerate fallback directories for October 2021. Closes
ticket 40493.
o Minor features (logging, heartbeat):
- When a relay receives a cell that isn't encrypted properly for it,
but the relay is the last hop on the circuit, the relay now counts
how many cells of this kind it receives, on how many circuits, and
reports this information in the log. Previously, we'd log each
cell at PROTOCOL_WARN level, which is far too verbose to be
useful. Fixes part of ticket 40400.
o Minor features (testing):
- We now have separate fuzzers for the inner layers of v3 onion
service descriptors, to prevent future bugs like 40392. Closes
ticket 40488.
o Minor bugfixes (compilation):
- Fix compilation error when __NR_time is not defined. Fixes bug
40465; bugfix on 0.2.5.5-alpha. Patch by Daniel Pinto.
o Minor bugfixes (dirauth, bandwidth scanner):
- Add the AuthDirDontVoteOnDirAuthBandwidth dirauth config parameter
to avoid voting on bandwidth scanner weights to v3 directory
authorities. Fixes bug 40471; bugfix on 0.2.2.1-alpha. Patch by
Neel Chauhan.
o Minor bugfixes (fragile-hardening, sandbox):
- When building with --enable-fragile-hardening, add or relax Linux
seccomp rules to allow AddressSanitizer to execute normally if the
process terminates with the sandbox active. This has the side
effect of disabling the filtering of file- and directory-open
requests on most systems and dilutes the effectiveness of the
sandbox overall, as a wider range of system calls must be
permitted. Fixes bug 11477; bugfix on 0.2.5.4-alpha.
o Minor bugfixes (logging):
- If a channel has never received or transmitted a cell, or seen a
client, do not calculate time diffs against 1/1/1970 but log a
better prettier message. Fixes bug 40182; bugfix on 0.2.4.4.
o Minor bugfixes (onion service):
- Fix a warning BUG that would occur often on heavily loaded onion
service leading to filling the logs with useless warnings. Fixes
bug 34083; bugfix on 0.3.2.1-alpha.
o Minor bugfix (CI, onion service):
- Exclude onion service version 2 Stem tests in our CI. Fixes bug 40500;
bugfix on 0.3.2.1-alpha.
o Minor bugfixes (onion service, config):
- Fix a memory leak for a small config line string that could occur
if the onion service failed to be configured from file properly.
Fixes bug 40484; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (onion service, TROVE-2021-008):
- Only log v2 access attempts once total, in order to not pollute
the logs with warnings and to avoid recording the times on disk
when v2 access was attempted. Note that the onion address was
_never_ logged. This counts as a Low-severity security issue.
Fixes bug 40474; bugfix on 0.4.5.8.
- Note that due to #40476 which removes v2 support entirely, this
log line is not emitted anymore. We still mention this in the
changelog because it is a Low-severity TROVE.
o Minor bugfixes (usability):
- Do not log "RENDEZVOUS1 cell with unrecognized rendezvous cookie"
at LOG_PROTOCOL_WARN; instead log it at DEBUG. This warning can
happen naturally if a client gives up on a rendezvous circuit
after sending INTRODUCE1. Fixes part of bug 40400; bugfix
on 0.1.1.13-alpha.
- Do not log "circuit_receive_relay_cell failed" at
LOG_PROTOCOL_WARN; instead log it at DEBUG. In every case where we
would want to log this as a protocol warning, we are already
logging another warning from inside circuit_receive_relay_cell.
Fixes part of bug 40400; bugfix on 0.1.1.9-alpha.
o Code simplification and refactoring:
- Lower the official maximum for "guard-extreme-restriction-percent"
to 100. This has no effect on when the guard code will generate a
warning, but it makes the intent of the option clearer. Fixes bug
40486; bugfix on 0.3.0.1-alpha.
o Testing:
- Add unit tests for the Linux seccomp sandbox. Resolves
issue 16803.
o Code simplification and refactoring (rust):
- Remove Rust support and its associated code. It is unsupported and
Rust focus should be shifted to arti. Closes ticket 40469.
o Testing (CI, chutney):
- Bump the data size that chutney transmits to 5MBytes in order to
trigger the flow control and congestion window code. Closes
ticket 40485.
Changes in version 0.4.6.8 - 2021-10-26
This version fixes several bugs from earlier versions of Tor. One
highlight is a fix on how we track DNS timeouts to report general
relay overload.
o Major bugfixes (relay, overload state):
- Relays report the general overload state for DNS timeout errors
only if X% of all DNS queries over Y seconds are errors. Before
that, it only took 1 timeout to report the overload state which
was just too low of a threshold. The X and Y values are 1% and 10
minutes respectively but they are also controlled by consensus
parameters. Fixes bug 40491; bugfix on 0.4.6.1-alpha.
o Minor features (fallbackdir):
- Regenerate fallback directories for October 2021. Closes
ticket 40493.
o Minor features (testing):
- On a testing network, relays can now use the
TestingMinTimeToReportBandwidth option to change the smallest
amount of time over which they're willing to report their observed
maximum bandwidth. Previously, this was fixed at 1 day. For
safety, values under 2 hours are only supported on testing
networks. Part of a fix for ticket 40337.
- Relays on testing networks no longer rate-limit how frequently
they are willing to report new bandwidth measurements. Part of a
fix for ticket 40337.
- Relays on testing networks now report their observed bandwidths
immediately from startup. Previously, they waited until they had
been running for a full day. Closes ticket 40337.
o Minor bugfix (onion service):
- Do not flag an HSDir as non-running in case the descriptor upload
or fetch fails. An onion service closes pending directory
connections before uploading a new descriptor which can thus lead
to wrongly flagging many relays and thus affecting circuit building
path selection. Fixes bug 40434; bugfix on 0.2.0.13-alpha.
- Improve logging when a bad HS version is given. Fixes bug 40476;
bugfix on 0.4.6.1-alpha.
o Minor bugfix (CI, onion service):
- Exclude onion service version 2 Stem tests in our CI. Fixes bug 40500;
bugfix on 0.3.2.1-alpha.
o Minor bugfixes (compatibility):
- Fix compatibility with the most recent Libevent versions, which no
longer have an evdns_set_random_bytes() function. Because this
function has been a no-op since Libevent 2.0.4-alpha, it is safe
for us to just stop calling it. Fixes bug 40371; bugfix
on 0.2.1.7-alpha.
o Minor bugfixes (onion service, TROVE-2021-008):
- Only log v2 access attempts once total, in order to not pollute
the logs with warnings and to avoid recording the times on disk
when v2 access was attempted. Note that the onion address was
_never_ logged. This counts as a Low-severity security issue.
Fixes bug 40474; bugfix on 0.4.5.8.
Changes in version 0.4.5.11 - 2021-10-26
The major change in this version is that v2 onion services are now
disabled at the client, service, and relay: any Tor nodes running this
version and onward will stop supporting v2 onion services. This is the
last step in the long deprecation process of v2 onion services.
Everyone running an earlier version, whether as a client, a relay, or
an onion service, should upgrade to Tor 0.3.5.17, 0.4.5.11,
or 0.4.6.8.
o Major feature (onion service v2):
- See https://blog.torproject.org/v2-deprecation-timeline for
details on how to transition from v2 to v3.
- The control port commands HSFETCH and HSPOST no longer allow
version 2, and it is no longer possible to create a v2 service
with ADD_ONION.
- Tor no longer allows creating v2 services, or connecting as a
client to a v2 service. Relays will decline to be a v2 HSDir or
introduction point. This effectively disables onion service
version 2 Tor-wide. Closes ticket 40476.
o Minor features (bridge, backport from 0.4.6.8):
- We now announce the URL to Tor's new bridge status at
https://bridges.torproject.org/ when Tor is configured to run as a
bridge relay. Closes ticket 30477.
o Minor features (fallbackdir):
- Regenerate fallback directories for October 2021. Closes
ticket 40493.
o Minor features (logging, diagnostic, backport from 0.4.6.5):
- Log decompression failures at a higher severity level, since they
can help provide missing context for other warning messages. We
rate-limit these messages, to avoid flooding the logs if they
begin to occur frequently. Closes ticket 40175.
o Minor features (testing, backport from 0.4.6.8):
- On a testing network, relays can now use the
TestingMinTimeToReportBandwidth option to change the smallest
amount of time over which they're willing to report their observed
maximum bandwidth. Previously, this was fixed at 1 day. For
safety, values under 2 hours are only supported on testing
networks. Part of a fix for ticket 40337.
- Relays on testing networks no longer rate-limit how frequently
they are willing to report new bandwidth measurements. Part of a
fix for ticket 40337.
- Relays on testing networks now report their observed bandwidths
immediately from startup. Previously, they waited until they had
been running for a full day. Closes ticket 40337.
o Minor bugfix (CI, onion service):
- Exclude onion service version 2 Stem tests in our CI. Fixes bug 40500;
bugfix on 0.3.2.1-alpha.
o Minor bugfix (onion service, backport from 0.4.6.8):
- Do not flag an HSDir as non-running in case the descriptor upload
or fetch fails. An onion service closes pending directory
connections before uploading a new descriptor which can thus lead
to wrongly flagging many relays and thus affecting circuit building
path selection. Fixes bug 40434; bugfix on 0.2.0.13-alpha.
o Minor bugfixes (compatibility, backport from 0.4.6.8):
- Fix compatibility with the most recent Libevent versions, which no
longer have an evdns_set_random_bytes() function. Because this
function has been a no-op since Libevent 2.0.4-alpha, it is safe
for us to just stop calling it. Fixes bug 40371; bugfix
on 0.2.1.7-alpha.
o Minor bugfixes (consensus handling, backport from 0.4.6.4-rc):
- Avoid a set of bugs that could be caused by inconsistently
preferring an out-of-date consensus stored in a stale directory
cache over a more recent one stored on disk as the latest
consensus. Fixes bug 40375; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (onion service, TROVE-2021-008, backport from 0.4.6.8):
- Only log v2 access attempts once total, in order to not pollute
the logs with warnings and to avoid recording the times on disk
when v2 access was attempted. Note that the onion address was
_never_ logged. This counts as a Low-severity security issue.
Fixes bug 40474; bugfix on 0.4.5.8.
Changes in version 0.3.5.17 - 2021-10-26
The major change in this version is that v2 onion services are now
disabled at the client, service, and relay: any Tor nodes running this
version and onward will stop supporting v2 onion services. This is the
last step in the long deprecation process of v2 onion services.
Everyone running an earlier version, whether as a client, a relay, or
an onion service, should upgrade to Tor 0.3.5.17, 0.4.5.11,
or 0.4.6.8.
o Major feature (onion service v2, backport from 0.4.5.11):
- See https://blog.torproject.org/v2-deprecation-timeline for
details on how to transition from v2 to v3.
- The control port commands HSFETCH and HSPOST no longer allow
version 2, and it is no longer possible to create a v2 service
with ADD_ONION.
- Tor no longer allows creating v2 services, or connecting as a
client to a v2 service. Relays will decline to be a v2 HSDir or
introduction point. This effectively disables onion service
version 2 Tor-wide. Closes ticket 40476.
o Minor features (bridge, backport from 0.4.6.8):
- We now announce the URL to Tor's new bridge status at
https://bridges.torproject.org/ when Tor is configured to run as a
bridge relay. Closes ticket 30477.
o Minor features (fallbackdir):
- Regenerate fallback directories for October 2021. Closes
ticket 40493.
o Minor bugfixes (compatibility, backport from 0.4.6.8):
- Fix compatibility with the most recent Libevent versions, which no
longer have an evdns_set_random_bytes() function. Because this
function has been a no-op since Libevent 2.0.4-alpha, it is safe
for us to just stop calling it. Fixes bug 40371; bugfix
on 0.2.1.7-alpha.
Changes in version 0.4.7.1-alpha - 2021-09-17
This version is the first alpha release of the 0.4.7.x series. One
major feature is Vanguards Lite, from proposal 333, to help mitigate
guard discovery attacks against onion services. It also includes
numerous bugfixes.
o Major features (Proposal 332, onion services, guard selection algorithm):
- Clients and onion services now choose four long-lived "layer 2"
guard relays for use as the middle hop in all onion circuits.
These relays are kept in place for a randomized duration averaging
1 week. This mitigates guard discovery attacks against clients and
short-lived onion services such as OnionShare. Long-lived onion
services that need high security should still use the Vanguards
addon (https://github.com/mikeperry-tor/vanguards). Closes ticket
40363; implements proposal 333.
o Minor features (bridge testing support):
- Let external bridge reachability testing tools discard cached
bridge descriptors when setting new bridges, so they can be sure
to get a clean reachability test. Implements ticket 40209.
o Minor features (fuzzing):
- When building with --enable-libfuzzer, use a set of compiler flags
that works with more recent versions of the library. Previously we
were using a set of flags from 2017. Closes ticket 40407.
o Minor features (testing configuration):
- When TestingTorNetwork is enabled, skip the permissions check on
hidden service directories. Closes ticket 40338.
- On a testing network, relays can now use the
TestingMinTimeToReportBandwidth option to change the smallest
amount of time over which they're willing to report their observed
maximum bandwidth. Previously, this was fixed at 1 day. For
safety, values under 2 hours are only supported on testing
networks. Part of a fix for ticket 40337.
- Relays on testing networks no longer rate-limit how frequently
they are willing to report new bandwidth measurements. Part of a
fix for ticket 40337.
- Relays on testing networks now report their observed bandwidths
immediately from startup. Previously, they waited until they had
been running for a full day. Closes ticket 40337.
o Minor bugfixes (circuit padding):
- Don't send STOP circuit padding cells when the other side has
already shut down the corresponding padding machine. Fixes bug
40435; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (compatibility):
- Fix compatibility with the most recent Libevent versions, which no
longer have an evdns_set_random_bytes() function. Because this
function has been a no-op since Libevent 2.0.4-alpha, it is safe
for us to just stop calling it. Fixes bug 40371; bugfix
on 0.2.1.7-alpha.
o Minor bugfixes (control, sandbox):
- Allows the control command SAVECONF to succeed when the seccomp
sandbox is enabled. Makes SAVECONF keep only one backup file, to
simplify implementation. Fixes bug 40317; bugfix on 0.2.5.4-alpha.
Patch by Daniel Pinto.
o Minor bugfixes (heartbeat):
- Adjust the heartbeat log message about distinct clients to
consider the HeartbeatPeriod rather than a flat 6-hour delay.
Fixes bug 40330; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (logging, relay):
- Add spaces between the "and" when logging the "Your server has not
managed to confirm reachability for its" on dual-stack relays.
Fixes bug 40453; bugfix on 0.4.5.1-alpha. Patch by Neel Chauhan.
o Minor bugfixes (onion service):
- Do not flag an HSDir as non-running in case the descriptor upload
or fetch fails. An onion service closes pending directory
connections before uploading a new descriptor which leads to
wrongly flagging many relays and thus affecting circuit path
selection. Fixes bug 40434; bugfix on 0.2.0.13-alpha.
o Minor bugfixes (statistics):
- Fix a fencepost issue when we check stability_last_downrated where
we called rep_hist_downrate_old_runs() twice. Fixes bug 40394;
bugfix on 0.2.0.5-alpha. Patch by Neel Chauhan.
o Minor bugfixes (tests):
- Fix a bug that prevented some tests from running with the correct
names. Fixes bug 40365; bugfix on 0.4.3.1-alpha.
o Documentation:
- Add links to original tor design paper and anonbib to
docs/HACKING/README.1st.md. Closes ticket 33742. Patch from
Emily Bones.
- Describe the "fingerprint-ed25519" file in the tor.1 man page.
Fixes bug 40467; bugfix on 0.4.3.1-alpha. Patch by Neel Chauhan.
Changes in version 0.4.6.7 - 2021-08-16
This version fixes several bugs from earlier versions of Tor,
including one that could lead to a denial-of-service attack. Everyone
running an earlier version, whether as a client, a relay, or an onion
service, should upgrade to Tor 0.3.5.16, 0.4.5.10, or 0.4.6.7.
o Major bugfixes (cryptography, security):
- Resolve an assertion failure caused by a behavior mismatch between
our batch-signature verification code and our single-signature
verification code. This assertion failure could be triggered
remotely, leading to a denial of service attack. We fix this issue
by disabling batch verification. Fixes bug 40078; bugfix on
0.2.6.1-alpha. This issue is also tracked as TROVE-2021-007 and
CVE-2021-38385. Found by Henry de Valence.
o Minor feature (fallbackdir):
- Regenerate fallback directories list. Close ticket 40447.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2021/08/12.
o Minor bugfix (crypto):
- Disable the unused batch verification feature of ed25519-donna.
Fixes bug 40078; bugfix on 0.2.6.1-alpha. Found by Henry
de Valence.
o Minor bugfixes (onion service):
- Send back the extended SOCKS error 0xF6 (Onion Service Invalid
Address) for a v2 onion address. Fixes bug 40421; bugfix
on 0.4.6.2-alpha.
o Minor bugfixes (relay):
- Reduce the compression level for data streaming from HIGH to LOW
in order to reduce CPU load on the directory relays. Fixes bug
40301; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (timekeeping):
- Calculate the time of day correctly on systems where the time_t
type includes leap seconds. (This is not the case on most
operating systems, but on those where it occurs, our tor_timegm
function did not correctly invert the system's gmtime function,
which could result in assertion failures when calculating voting
schedules.) Fixes bug 40383; bugfix on 0.2.0.3-alpha.
Changes in version 0.4.5.10 - 2021-08-16
This version fixes several bugs from earlier versions of Tor,
including one that could lead to a denial-of-service attack. Everyone
running an earlier version, whether as a client, a relay, or an onion
service, should upgrade to Tor 0.3.5.16, 0.4.5.10, or 0.4.6.7.
o Major bugfixes (cryptography, security):
- Resolve an assertion failure caused by a behavior mismatch between
our batch-signature verification code and our single-signature
verification code. This assertion failure could be triggered
remotely, leading to a denial of service attack. We fix this issue
by disabling batch verification. Fixes bug 40078; bugfix on
0.2.6.1-alpha. This issue is also tracked as TROVE-2021-007 and
CVE-2021-38385. Found by Henry de Valence.
o Minor feature (fallbackdir):
- Regenerate fallback directories list. Close ticket 40447.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2021/08/12.
o Minor features (testing):
- Enable the deterministic RNG for unit tests that covers the
address set bloomfilter-based API's. Fixes bug 40419; bugfix
on 0.3.3.2-alpha.
o Minor bugfix (crypto, backport from 0.4.6.7):
- Disable the unused batch verification feature of ed25519-donna.
Fixes bug 40078; bugfix on 0.2.6.1-alpha. Found by Henry
de Valence.
o Minor bugfixes (relay, backport from 0.4.6.7):
- Reduce the compression level for data streaming from HIGH to LOW.
Fixes bug 40301; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (timekeeping, backport from 0.4.6.7):
- Calculate the time of day correctly on systems where the time_t
type includes leap seconds. (This is not the case on most
operating systems, but on those where it occurs, our tor_timegm
function did not correctly invert the system's gmtime function,
which could result in assertion failures when calculating voting
schedules.) Fixes bug 40383; bugfix on 0.2.0.3-alpha.
o Minor bugfixes (warnings, portability, backport from 0.4.6.6):
- Suppress a strict-prototype warning when building with some
versions of NSS. Fixes bug 40409; bugfix on 0.3.5.1-alpha.
Changes in version 0.3.5.16 - 2021-08-16
This version fixes several bugs from earlier versions of Tor,
including one that could lead to a denial-of-service attack. Everyone
running an earlier version, whether as a client, a relay, or an onion
service, should upgrade to Tor 0.3.5.16, 0.4.5.10, or 0.4.6.7.
o Major bugfixes (cryptography, security):
- Resolve an assertion failure caused by a behavior mismatch between
our batch-signature verification code and our single-signature
verification code. This assertion failure could be triggered
remotely, leading to a denial of service attack. We fix this issue
by disabling batch verification. Fixes bug 40078; bugfix on
0.2.6.1-alpha. This issue is also tracked as TROVE-2021-007 and
CVE-2021-38385. Found by Henry de Valence.
o Minor feature (fallbackdir):
- Regenerate fallback directories list. Close ticket 40447.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2021/08/12.
o Minor bugfix (crypto, backport from 0.4.6.7):
- Disable the unused batch verification feature of ed25519-donna.
Fixes bug 40078; bugfix on 0.2.6.1-alpha. Found by Henry
de Valence.
o Minor bugfixes (relay, backport from 0.4.6.7):
- Reduce the compression level for data streaming from HIGH to LOW.
Fixes bug 40301; bugfix on 0.3.5.1-alpha.
Changes in version 0.4.6.6 - 2021-06-30
Tor 0.4.6.6 makes several small fixes on 0.4.6.5, including one that
allows Tor to build correctly on older versions of GCC. You should
upgrade to this version if you were having trouble building Tor
0.4.6.5; otherwise, there is probably no need.
o Minor bugfixes (compilation):
- Fix a compilation error when trying to build Tor with a compiler
that does not support const variables in static initializers.
Fixes bug 40410; bugfix on 0.4.6.5.
- Suppress a strict-prototype warning when building with some
versions of NSS. Fixes bug 40409; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (testing):
- Enable the deterministic RNG for unit tests that covers the
address set bloomfilter-based API's. Fixes bug 40419; bugfix
on 0.3.3.2-alpha.
Changes in version 0.4.5.9 - 2021-06-14
Tor 0.4.5.9 fixes several security issues, including a
denial-of-service attack against onion service clients, and another
denial-of-service attack against relays. Everybody should upgrade to
one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
o Major bugfixes (security, backport from 0.4.6.5):
- Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on
half-closed streams. Previously, clients failed to validate which
hop sent these cells: this would allow a relay on a circuit to end
a stream that wasn't actually built with it. Fixes bug 40389;
bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021-
003 and CVE-2021-34548.
o Major bugfixes (security, defense-in-depth, backport from 0.4.6.5):
- Detect more failure conditions from the OpenSSL RNG code.
Previously, we would detect errors from a missing RNG
implementation, but not failures from the RNG code itself.
Fortunately, it appears those failures do not happen in practice
when Tor is using OpenSSL's default RNG implementation. Fixes bug
40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.
o Major bugfixes (security, denial of service, backport from 0.4.6.5):
- Resist a hashtable-based CPU denial-of-service attack against
relays. Previously we used a naive unkeyed hash function to look
up circuits in a circuitmux object. An attacker could exploit this
to construct circuits with chosen circuit IDs, to create
collisions and make the hash table inefficient. Now we use a
SipHash construction here instead. Fixes bug 40391; bugfix on
0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and
CVE-2021-34549. Reported by Jann Horn from Google's Project Zero.
- Fix an out-of-bounds memory access in v3 onion service descriptor
parsing. An attacker could exploit this bug by crafting an onion
service descriptor that would crash any client that tried to visit
it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also
tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei
Glazunov from Google's Project Zero.
o Minor features (compatibility, backport from 0.4.6.4-rc):
- Remove an assertion function related to TLS renegotiation. It was
used nowhere outside the unit tests, and it was breaking
compilation with recent alpha releases of OpenSSL 3.0.0. Closes
ticket 40399.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2021/06/10.
o Minor bugfixes (control, sandbox, backport from 0.4.6.4-rc):
- Allow the control command SAVECONF to succeed when the seccomp
sandbox is enabled, and make SAVECONF keep only one backup file to
simplify implementation. Previously SAVECONF allowed a large
number of backup files, which made it incompatible with the
sandbox. Fixes bug 40317; bugfix on 0.2.5.4-alpha. Patch by
Daniel Pinto.
o Minor bugfixes (metrics port, backport from 0.4.6.4-rc):
- Fix a bug that made tor try to re-bind() on an already open
MetricsPort every 60 seconds. Fixes bug 40370; bugfix
on 0.4.5.1-alpha.
Changes in version 0.4.4.9 - 2021-06-14
Tor 0.4.4.9 fixes several security issues, including a
denial-of-service attack against onion service clients, and another
denial-of-service attack against relays. Everybody should upgrade to
one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
Note that the scheduled end-of-life date for the Tor 0.4.4.x series is
June 15. This is therefore the last release in its series. Everybody
still running 0.4.4.x should plan to upgrade to 0.4.5.x or later.
o Major bugfixes (security, backport from 0.4.6.5):
- Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on
half-closed streams. Previously, clients failed to validate which
hop sent these cells: this would allow a relay on a circuit to end
a stream that wasn't actually built with it. Fixes bug 40389;
bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021-
003 and CVE-2021-34548.
o Major bugfixes (security, defense-in-depth, backport from 0.4.6.5):
- Detect more failure conditions from the OpenSSL RNG code.
Previously, we would detect errors from a missing RNG
implementation, but not failures from the RNG code itself.
Fortunately, it appears those failures do not happen in practice
when Tor is using OpenSSL's default RNG implementation. Fixes bug
40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.
o Major bugfixes (security, denial of service, backport from 0.4.6.5):
- Resist a hashtable-based CPU denial-of-service attack against
relays. Previously we used a naive unkeyed hash function to look
up circuits in a circuitmux object. An attacker could exploit this
to construct circuits with chosen circuit IDs, to create
collisions and make the hash table inefficient. Now we use a
SipHash construction here instead. Fixes bug 40391; bugfix on
0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and
CVE-2021-34549. Reported by Jann Horn from Google's Project Zero.
- Fix an out-of-bounds memory access in v3 onion service descriptor
parsing. An attacker could exploit this bug by crafting an onion
service descriptor that would crash any client that tried to visit
it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also
tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei
Glazunov from Google's Project Zero.
o Minor features (compatibility, backport from 0.4.6.4-rc):
- Remove an assertion function related to TLS renegotiation. It was
used nowhere outside the unit tests, and it was breaking
compilation with recent alpha releases of OpenSSL 3.0.0. Closes
ticket 40399.
o Minor features (fallback directory list, backport from 0.4.6.2-alpha):
- Regenerate the list of fallback directories to contain a new set
of 200 relays. Closes ticket 40265.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2021/06/10.
o Minor bugfixes (channel, DoS, backport from 0.4.6.2-alpha):
- Fix a non-fatal BUG() message due to a too-early free of a string,
when listing a client connection from the DoS defenses subsystem.
Fixes bug 40345; bugfix on 0.4.3.4-rc.
o Minor bugfixes (compiler warnings, backport from 0.4.6.3-rc):
- Fix an indentation problem that led to a warning from GCC 11.1.1.
Fixes bug 40380; bugfix on 0.3.0.1-alpha.
Changes in version 0.3.5.15 - 2021-06-14
Tor 0.3.5.15 fixes several security issues, including a
denial-of-service attack against onion service clients, and another
denial-of-service attack against relays. Everybody should upgrade to
one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
o Major bugfixes (security, backport from 0.4.6.5):
- Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on
half-closed streams. Previously, clients failed to validate which
hop sent these cells: this would allow a relay on a circuit to end
a stream that wasn't actually built with it. Fixes bug 40389;
bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021-
003 and CVE-2021-34548.
o Major bugfixes (security, defense-in-depth, backport from 0.4.6.5):
- Detect more failure conditions from the OpenSSL RNG code.
Previously, we would detect errors from a missing RNG
implementation, but not failures from the RNG code itself.
Fortunately, it appears those failures do not happen in practice
when Tor is using OpenSSL's default RNG implementation. Fixes bug
40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.
o Major bugfixes (security, denial of service, backport from 0.4.6.5):
- Resist a hashtable-based CPU denial-of-service attack against
relays. Previously we used a naive unkeyed hash function to look
up circuits in a circuitmux object. An attacker could exploit this
to construct circuits with chosen circuit IDs, to create
collisions and make the hash table inefficient. Now we use a
SipHash construction here instead. Fixes bug 40391; bugfix on
0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and
CVE-2021-34549. Reported by Jann Horn from Google's Project Zero.
- Fix an out-of-bounds memory access in v3 onion service descriptor
parsing. An attacker could exploit this bug by crafting an onion
service descriptor that would crash any client that tried to visit
it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also
tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei
Glazunov from Google's Project Zero.
o Minor bugfixes (compiler warnings, backport from 0.4.6.3-rc):
- Fix an indentation problem that led to a warning from GCC 11.1.1.
Fixes bug 40380; bugfix on 0.3.0.1-alpha.
o Minor features (compatibility, backport from 0.4.6.4-rc):
- Remove an assertion function related to TLS renegotiation. It was
used nowhere outside the unit tests, and it was breaking
compilation with recent alpha releases of OpenSSL 3.0.0. Closes
ticket 40399.
o Minor features (fallback directory list, backport from 0.4.6.2-alpha):
- Regenerate the list of fallback directories to contain a new set
of 200 relays. Closes ticket 40265.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2021/06/10.
Changes in version 0.4.6.5 - 2021-06-14
Tor 0.4.6.5 is the first stable release in its series. The 0.4.6.x
series includes numerous features and bugfixes, including a significant
improvement to our circuit timeout algorithm that should improve
observed client performance, and a way for relays to report when they are
overloaded.
This release also includes security fixes for several security issues,
including a denial-of-service attack against onion service clients,
and another denial-of-service attack against relays. Everybody should
upgrade to one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
Below are the changes since 0.4.6.4-rc. For a complete list of changes
since 0.4.5.8, see the ReleaseNotes file.
o Major bugfixes (security):
- Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on
half-closed streams. Previously, clients failed to validate which
hop sent these cells: this would allow a relay on a circuit to end
a stream that wasn't actually built with it. Fixes bug 40389;
bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021-
003 and CVE-2021-34548.
o Major bugfixes (security, defense-in-depth):
- Detect more failure conditions from the OpenSSL RNG code.
Previously, we would detect errors from a missing RNG
implementation, but not failures from the RNG code itself.
Fortunately, it appears those failures do not happen in practice
when Tor is using OpenSSL's default RNG implementation. Fixes bug
40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.
o Major bugfixes (security, denial of service):
- Resist a hashtable-based CPU denial-of-service attack against
relays. Previously we used a naive unkeyed hash function to look
up circuits in a circuitmux object. An attacker could exploit this
to construct circuits with chosen circuit IDs, to create
collisions and make the hash table inefficient. Now we use a
SipHash construction here instead. Fixes bug 40391; bugfix on
0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and
CVE-2021-34549. Reported by Jann Horn from Google's Project Zero.
- Fix an out-of-bounds memory access in v3 onion service descriptor
parsing. An attacker could exploit this bug by crafting an onion
service descriptor that would crash any client that tried to visit
it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also
tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei
Glazunov from Google's Project Zero.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2021/06/10.
o Minor features (logging, diagnostic):
- Log decompression failures at a higher severity level, since they
can help provide missing context for other warning messages. We
rate-limit these messages, to avoid flooding the logs if they
begin to occur frequently. Closes ticket 40175.
Changes in version 0.4.6.4-rc - 2021-05-28
Tor 0.4.6.4-rc fixes a few bugs from previous releases. This, we hope,
the final release candidate in its series: unless major new issues are
found, the next release will be stable.
o Minor features (compatibility):
- Remove an assertion function related to TLS renegotiation. It was
used nowhere outside the unit tests, and it was breaking
compilation with recent alpha releases of OpenSSL 3.0.0. Closes
ticket 40399.
o Minor bugfixes (consensus handling):
- Avoid a set of bugs that could be caused by inconsistently
preferring an out-of-date consensus stored in a stale directory
cache over a more recent one stored on disk as the latest
consensus. Fixes bug 40375; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (control, sandbox):
- Allow the control command SAVECONF to succeed when the seccomp
sandbox is enabled, and make SAVECONF keep only one backup file to
simplify implementation. Previously SAVECONF allowed a large
number of backup files, which made it incompatible with the
sandbox. Fixes bug 40317; bugfix on 0.2.5.4-alpha. Patch by
Daniel Pinto.
o Minor bugfixes (metrics port):
- Fix a bug that made tor try to re-bind() on an already open
MetricsPort every 60 seconds. Fixes bug 40370; bugfix
on 0.4.5.1-alpha.
o Removed features:
- Remove unneeded code for parsing private keys in directory
documents. This code was only used for client authentication in v2
onion services, which are now unsupported. Closes ticket 40374.
Changes in version 0.4.5.8 - 2021-05-10
Tor 0.4.5.8 fixes several bugs in earlier version, backporting fixes
from the 0.4.6.x series.
o Minor features (compatibility, Linux seccomp sandbox, backport from 0.4.6.3-rc):
- Add a workaround to enable the Linux sandbox to work correctly
with Glibc 2.33. This version of Glibc has started using the
fstatat() system call, which previously our sandbox did not allow.
Closes ticket 40382; see the ticket for a discussion of trade-offs.
o Minor features (compilation, backport from 0.4.6.3-rc):
- Make the autoconf script build correctly with autoconf versions
2.70 and later. Closes part of ticket 40335.
o Minor features (fallback directory list, backport from 0.4.6.2-alpha):
- Regenerate the list of fallback directories to contain a new set
of 200 relays. Closes ticket 40265.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2021/05/07.
o Minor features (onion services):
- Add warning message when connecting to now deprecated v2 onion
services. As announced, Tor 0.4.5.x is the last series that will
support v2 onions. Closes ticket 40373.
o Minor bugfixes (bridge, pluggable transport, backport from 0.4.6.2-alpha):
- Fix a regression that made it impossible start Tor using a bridge
line with a transport name and no fingerprint. Fixes bug 40360;
bugfix on 0.4.5.4-rc.
o Minor bugfixes (build, cross-compilation, backport from 0.4.6.3-rc):
- Allow a custom "ar" for cross-compilation. Our previous build
script had used the $AR environment variable in most places, but
it missed one. Fixes bug 40369; bugfix on 0.4.5.1-alpha.
o Minor bugfixes (channel, DoS, backport from 0.4.6.2-alpha):
- Fix a non-fatal BUG() message due to a too-early free of a string,
when listing a client connection from the DoS defenses subsystem.
Fixes bug 40345; bugfix on 0.4.3.4-rc.
o Minor bugfixes (compiler warnings, backport from 0.4.6.3-rc):
- Fix an indentation problem that led to a warning from GCC 11.1.1.
Fixes bug 40380; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (controller, backport from 0.4.6.1-alpha):
- Fix a "BUG" warning that would appear when a controller chooses
the first hop for a circuit, and that circuit completes. Fixes bug
40285; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (onion service, client, memory leak, backport from 0.4.6.3-rc):
- Fix a bug where an expired cached descriptor could get overwritten
with a new one without freeing it, leading to a memory leak. Fixes
bug 40356; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (testing, BSD, backport from 0.4.6.2-alpha):
- Fix pattern-matching errors when patterns expand to invalid paths
on BSD systems. Fixes bug 40318; bugfix on 0.4.5.1-alpha. Patch by
Daniel Pinto.
Changes in version 0.4.6.3-rc - 2021-05-10
Tor 0.4.6.3-rc is the first release candidate in its series. It fixes
a few small bugs from previous versions, and adds a better error
message when trying to use (no longer supported) v2 onion services.
Though we anticipate that we'll be doing a bit more clean-up between
now and the stable release, we expect that our remaining changes will
be fairly simple. There will likely be at least one more release
candidate before 0.4.6.x is stable.
o Major bugfixes (onion service, control port):
- Make the ADD_ONION command properly configure client authorization.
Before this fix, the created onion failed to add the client(s).
Fixes bug 40378; bugfix on 0.4.6.1-alpha.
o Minor features (compatibility, Linux seccomp sandbox):
- Add a workaround to enable the Linux sandbox to work correctly
with Glibc 2.33. This version of Glibc has started using the
fstatat() system call, which previously our sandbox did not allow.
Closes ticket 40382; see the ticket for a discussion of trade-offs.
o Minor features (compilation):
- Make the autoconf script build correctly with autoconf versions
2.70 and later. Closes part of ticket 40335.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2021/05/07.
o Minor features (onion services):
- Add a warning message when trying to connect to (no longer
supported) v2 onion services. Closes ticket 40373.
o Minor bugfixes (build, cross-compilation):
- Allow a custom "ar" for cross-compilation. Our previous build
script had used the $AR environment variable in most places, but
it missed one. Fixes bug 40369; bugfix on 0.4.5.1-alpha.
o Minor bugfixes (compiler warnings):
- Fix an indentation problem that led to a warning from GCC 11.1.1.
Fixes bug 40380; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (logging, relay):
- Emit a warning if an Address is found to be internal and tor can't
use it. Fixes bug 40290; bugfix on 0.4.5.1-alpha.
o Minor bugfixes (onion service, client, memory leak):
- Fix a bug where an expired cached descriptor could get overwritten
with a new one without freeing it, leading to a memory leak. Fixes
bug 40356; bugfix on 0.3.5.1-alpha.
Changes in version 0.4.6.2-alpha - 2021-04-15
Tor 0.4.6.2-alpha is the second alpha in its series. It fixes several
small bugs in previous releases, and solves other issues that had
enabled denial-of-service attacks and affected integration with
other tools.
o Minor features (client):
- Clients now check whether their streams are attempting to re-enter
the Tor network (i.e. to send Tor traffic over Tor), and close
them preemptively if they think exit relays will refuse them for
this reason. See ticket 2667 for details. Closes ticket 40271.
o Minor features (command line):
- Add long format name "--torrc-file" equivalent to the existing
command-line option "-f". Closes ticket 40324. Patch by
Daniel Pinto.
o Minor features (dormant mode):
- Add a new 'DormantTimeoutEnabled' option to allow coarse-grained
control over whether the client ever becomes dormant from
inactivity. Most people won't need this. Closes ticket 40228.
o Minor features (fallback directory list):
- Regenerate the list of fallback directories to contain a new set
of 200 relays. Closes ticket 40265.
o Minor features (geoip data):
- Update the geoip files to match the IPFire Location Database, as
retrieved on 2021/04/13.
o Minor features (logging):
- Edit heartbeat log messages so that more of them begin with the
string "Heartbeat: ". Closes ticket 40322; patch
from 'cypherpunks'.
o Minor bugfixes (bridge, pluggable transport):
- Fix a regression that made it impossible start Tor using a bridge
line with a transport name and no fingerprint. Fixes bug 40360;
bugfix on 0.4.5.4-rc.
o Minor bugfixes (channel, DoS):
- Fix a non-fatal BUG() message due to a too-early free of a string,
when listing a client connection from the DoS defenses subsystem.
Fixes bug 40345; bugfix on 0.4.3.4-rc.
o Minor bugfixes (compilation):
- Fix a compilation warning about unused functions when building
with a libc that lacks the GLOB_ALTDIRFUNC constant. Fixes bug
40354; bugfix on 0.4.5.1-alpha. Patch by Daniel Pinto.
o Minor bugfixes (configuration):
- Fix pattern-matching for directories on all platforms when using
%include options in configuration files. This patch also fixes
compilation on musl libc based systems. Fixes bug 40141; bugfix
on 0.4.5.1-alpha.
o Minor bugfixes (relay):
- Move the "overload-general" line from extrainfo to the server
descriptor. Fixes bug 40364; bugfix on 0.4.6.1-alpha.
o Minor bugfixes (testing, BSD):
- Fix pattern-matching errors when patterns expand to invalid paths
on BSD systems. Fixes bug 40318; bugfix on 0.4.5.1-alpha. Patch by
Daniel Pinto.
o Documentation (manual):
- Move the ServerTransport* options to the "SERVER OPTIONS" section.
Closes issue 40331.
- Indicate that the HiddenServiceStatistics option also applies to
bridges. Closes ticket 40346.
- Move the description of BridgeRecordUsageByCountry to the section
"STATISTICS OPTIONS". Closes ticket 40323.
Changes in version 0.4.6.1-alpha - 2021-03-18
Tor 0.4.6.1-alpha is the first alpha release in the 0.4.6.x series. It
improves client circuit performance, adds missing features, and
improves some of our DoS handling and statistics reporting. It also
includes numerous smaller bugfixes.
Below are the changes since 0.4.5.7. (Note that this release DOES
include the fixes for the security bugs already fixed in 0.4.5.7.)
o Major features (control port, onion services):
- Add controller support for creating version 3 onion services with
client authorization. Previously, only v2 onion services could be
created with client authorization. Closes ticket 40084. Patch by
Neel Chauhan.
o Major features (directory authority):
- When voting on a relay with a Sybil-like appearance, add the Sybil
flag when clearing out the other flags. This lets a relay operator
know why their relay hasn't been included in the consensus. Closes
ticket 40255. Patch by Neel Chauhan.
o Major features (metrics):
- Relays now report how overloaded they are in their extrainfo
documents. This information is controlled with the
OverloadStatistics torrc option, and it will be used to improve
decisions about the network's load balancing. Implements proposal
328; closes ticket 40222.
o Major features (relay, denial of service):
- Add a new DoS subsystem feature to control the rate of client
connections for relays. Closes ticket 40253.
o Major features (statistics):
- Relays now publish statistics about the number of v3 onion
services and volume of v3 onion service traffic, in the same
manner they already do for v2 onions. Closes ticket 23126.
o Major bugfixes (circuit build timeout):
- Improve the accuracy of our circuit build timeout calculation for
60%, 70%, and 80% build rates for various guard choices. We now
use a maximum likelihood estimator for Pareto parameters of the
circuit build time distribution, instead of a "right-censored
estimator". This causes clients to ignore circuits that never
finish building in their timeout calculations. Previously, clients
were counting such unfinished circuits as having the highest
possible build time value, when in reality these circuits most
likely just contain relays that are offline. We also now wait a
bit longer to let circuits complete for measurement purposes,
lower the minimum possible effective timeout from 1.5 seconds to
10ms, and increase the resolution of the circuit build time
histogram from 50ms bin widths to 10ms bin widths. Additionally,
we alter our estimate Xm by taking the maximum of the top 10 most
common build time values of the 10ms histogram, and compute Xm as
the average of these. Fixes bug 40168; bugfix on 0.2.2.14-alpha.
- Remove max_time calculation and associated warning from circuit
build timeout 'alpha' parameter estimation, as this is no longer
needed by our new estimator from 40168. Fixes bug 34088; bugfix
on 0.2.2.9-alpha.
o Major bugfixes (signing key):
- In the tor-gencert utility, give an informative error message if
the passphrase given in `--create-identity-key` is too short.
Fixes bug 40189; bugfix on 0.2.0.1-alpha. Patch by Neel Chauhan.
o Minor features (bridge):
- We now announce the URL to Tor's new bridge status at
https://bridges.torproject.org/ when Tor is configured to run as a
bridge relay. Closes ticket 30477.
o Minor features (build system):
- New "make lsp" command to auto generate the compile_commands.json
file used by the ccls server. The "bear" program is needed for
this. Closes ticket 40227.
o Minor features (command-line interface):
- Add build informations to `tor --version` in order to ease
reproducible builds. Closes ticket 32102.
- When parsing command-line flags that take an optional argument,
treat the argument as absent if it would start with a '-'
character. Arguments in that form are not intelligible for any of
our optional-argument flags. Closes ticket 40223.
- Allow a relay operator to list the ed25519 keys on the command
line by adding the `rsa` and `ed25519` arguments to the
--list-fingerprint flag to show the respective RSA and ed25519
relay fingerprint. Closes ticket 33632. Patch by Neel Chauhan.
o Minor features (control port, stream handling):
- Add the stream ID to the event line in the ADDRMAP control event.
Closes ticket 40249. Patch by Neel Chauhan.
o Minor features (dormant mode):
- Add a new 'DormantTimeoutEnabled' option for coarse-grained
control over whether the client can become dormant from
inactivity. Most people won't need this. Closes ticket 40228.
o Minor features (logging):
- Change the DoS subsystem heartbeat line format to be more clear on
what has been detected/rejected, and which option is disabled (if
any). Closes ticket 40308.
- In src/core/mainloop/mainloop.c and src/core/mainloop/connection.c,
put brackets around IPv6 addresses in log messages. Closes ticket
40232. Patch by Neel Chauhan.
o Minor features (performance, windows):
- Use SRWLocks to implement locking on Windows. Replaces the
"critical section" locking implementation with the faster
SRWLocks, available since Windows Vista. Closes ticket 17927.
Patch by Daniel Pinto.
o Minor features (protocol, proxy support, defense in depth):
- Close HAProxy connections if they somehow manage to send us data
before we start reading. Closes another case of ticket 40017.
o Minor features (tests, portability):
- Port the hs_build_address.py test script to work with recent
versions of python. Closes ticket 40213. Patch from
Samanta Navarro.
o Minor features (vote document):
- Add a "stats" line to directory authority votes, to report various
statistics that authorities compute about the relays. This will
help us diagnose the network better. Closes ticket 40314.
o Minor bugfixes (build):
- The configure script now shows whether or not lzma and zstd have
been used, not just if the enable flag was passed in. Fixes bug
40236; bugfix on 0.4.3.1-alpha.
o Minor bugfixes (compatibility):
- Fix a failure in the test cases when running on the "hppa"
architecture, along with a related test that might fail on other
architectures in the future. Fixes bug 40274; bugfix
on 0.2.5.1-alpha.
o Minor bugfixes (controller):
- Fix a "BUG" warning that would appear when a controller chooses
the first hop for a circuit, and that circuit completes. Fixes bug
40285; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (directory authorities, voting):
- Add a new consensus method (31) to support any future changes that
authorities decide to make to the value of bwweightscale or
maxunmeasuredbw. Previously, there was a bug that prevented the
authorities from parsing these consensus parameters correctly under
most circumstances. Fixes bug 19011; bugfix on 0.2.2.10-alpha.
o Minor bugfixes (ipv6):
- Allow non-SOCKSPorts to disable IPv4, IPv6, and PreferIPv4. Some
rare configurations might break, but in this case you can disable
NoIPv4Traffic and NoIPv6Traffic as needed. Fixes bug 33607; bugfix
on 0.4.1.1-alpha. Patch by Neel Chauhan.
o Minor bugfixes (key generation):
- Do not require a valid torrc when using the `--keygen` argument to
generate a signing key. This allows us to generate keys on systems
or users which may not run Tor. Fixes bug 40235; bugfix on
0.2.7.2-alpha. Patch by Neel Chauhan.
o Minor bugfixes (onion services, logging):
- Downgrade the severity of a few rendezvous circuit-related
warnings from warning to info. Fixes bug 40207; bugfix on
0.3.2.1-alpha. Patch by Neel Chauhan.
o Minor bugfixes (relay):
- Reduce the compression level for data streaming from HIGH to LOW.
This should reduce the CPU and memory burden for directory caches.
Fixes bug 40301; bugfix on 0.3.5.1-alpha.
o Code simplification and refactoring:
- Remove the orconn_ext_or_id_map structure and related functions.
(Nothing outside of unit tests used them.) Closes ticket 33383.
Patch by Neel Chauhan.
o Removed features:
- As of this release, Tor no longer supports the old v2 onion
services. They were deprecated last July for security, and support
will be removed entirely later this year. We strongly encourage
everybody to migrate to v3 onion services. For more information,
see https://blog.torproject.org/v2-deprecation-timeline . Closes
ticket 40266. (NOTE: We accidentally released an earlier version
of the 0.4.6.1-alpha changelog without this entry. Sorry for
the confusion!)
o Code simplification and refactoring (metrics, DoS):
- Move the DoS subsystem into the subsys manager, including its
configuration options. Closes ticket 40261.
o Removed features (relay):
- Because DirPorts are only used on authorities, relays no longer
advertise them. Similarly, self-testing for DirPorts has been
disabled, since an unreachable DirPort is no reason for a relay
not to advertise itself. (Configuring a DirPort will still work,
for now.) Closes ticket 40282.
Changes in version 0.3.5.14 - 2021-03-16
Tor 0.3.5.14 backports fixes for two important denial-of-service bugs
in earlier versions of Tor.
One of these vulnerabilities (TROVE-2021-001) would allow an attacker
who can send directory data to a Tor instance to force that Tor
instance to consume huge amounts of CPU. This is easiest to exploit
against authorities, since anybody can upload to them, but directory
caches could also exploit this vulnerability against relays or clients
when they download. The other vulnerability (TROVE-2021-002) only
affects directory authorities, and would allow an attacker to remotely
crash the authority with an assertion failure. Patches have already
been provided to the authority operators, to help ensure
network stability.
We recommend that everybody upgrade to one of the releases that fixes
these issues (0.3.5.14, 0.4.4.8, or 0.4.5.7) as they become available
to you.
This release also updates our GeoIP data source, and fixes a
compatibility issue.
o Major bugfixes (security, denial of service, backport from 0.4.5.7):
- Disable the dump_desc() function that we used to dump unparseable
information to disk. It was called incorrectly in several places,
in a way that could lead to excessive CPU usage. Fixes bug 40286;
bugfix on 0.2.2.1-alpha. This bug is also tracked as TROVE-2021-
001 and CVE-2021-28089.
- Fix a bug in appending detached signatures to a pending consensus
document that could be used to crash a directory authority. Fixes
bug 40316; bugfix on 0.2.2.6-alpha. Tracked as TROVE-2021-002
and CVE-2021-28090.
o Minor features (geoip data, backport from 0.4.5.7):
- We have switched geoip data sources. Previously we shipped IP-to-
country mappings from Maxmind's GeoLite2, but in 2019 they changed
their licensing terms, so we were unable to update them after that
point. We now ship geoip files based on the IPFire Location
Database instead. (See https://location.ipfire.org/ for more
information). This release updates our geoip files to match the
IPFire Location Database as retrieved on 2021/03/12. Closes
ticket 40224.
o Removed features (mallinfo deprecated, backport from 0.4.5.7):
- Remove mallinfo() usage entirely. Libc 2.33+ now deprecates it.
Closes ticket 40309.
Changes in version 0.4.4.8 - 2021-03-16
Tor 0.4.4.8 backports fixes for two important denial-of-service bugs
in earlier versions of Tor.
One of these vulnerabilities (TROVE-2021-001) would allow an attacker
who can send directory data to a Tor instance to force that Tor
instance to consume huge amounts of CPU. This is easiest to exploit
against authorities, since anybody can upload to them, but directory
caches could also exploit this vulnerability against relays or clients
when they download. The other vulnerability (TROVE-2021-002) only
affects directory authorities, and would allow an attacker to remotely
crash the authority with an assertion failure. Patches have already
been provided to the authority operators, to help ensure
network stability.
We recommend that everybody upgrade to one of the releases that fixes
these issues (0.3.5.14, 0.4.4.8, or 0.4.5.7) as they become available
to you.
This release also updates our GeoIP data source, and fixes a
compatibility issue.
o Major bugfixes (security, denial of service, backport from 0.4.5.7):
- Disable the dump_desc() function that we used to dump unparseable
information to disk. It was called incorrectly in several places,
in a way that could lead to excessive CPU usage. Fixes bug 40286;
bugfix on 0.2.2.1-alpha. This bug is also tracked as TROVE-2021-
001 and CVE-2021-28089.
- Fix a bug in appending detached signatures to a pending consensus
document that could be used to crash a directory authority. Fixes
bug 40316; bugfix on 0.2.2.6-alpha. Tracked as TROVE-2021-002
and CVE-2021-28090.
o Minor features (geoip data, backport from 0.4.5.7):
- We have switched geoip data sources. Previously we shipped IP-to-
country mappings from Maxmind's GeoLite2, but in 2019 they changed
their licensing terms, so we were unable to update them after that
point. We now ship geoip files based on the IPFire Location
Database instead. (See https://location.ipfire.org/ for more
information). This release updates our geoip files to match the
IPFire Location Database as retrieved on 2021/03/12. Closes
ticket 40224.
o Removed features (mallinfo deprecated, backport from 0.4.5.7):
- Remove mallinfo() usage entirely. Libc 2.33+ now deprecates it.
Closes ticket 40309.
Changes in version 0.4.5.7 - 2021-03-16
Tor 0.4.5.7 fixes two important denial-of-service bugs in earlier
versions of Tor.
One of these vulnerabilities (TROVE-2021-001) would allow an attacker
who can send directory data to a Tor instance to force that Tor
instance to consume huge amounts of CPU. This is easiest to exploit
against authorities, since anybody can upload to them, but directory
caches could also exploit this vulnerability against relays or clients
when they download. The other vulnerability (TROVE-2021-002) only
affects directory authorities, and would allow an attacker to remotely
crash the authority with an assertion failure. Patches have already
been provided to the authority operators, to help ensure
network stability.
We recommend that everybody upgrade to one of the releases that fixes
these issues (0.3.5.14, 0.4.4.8, or 0.4.5.7) as they become available
to you.
This release also updates our GeoIP data source, and fixes a few
smaller bugs in earlier releases.
o Major bugfixes (security, denial of service):
- Disable the dump_desc() function that we used to dump unparseable
information to disk. It was called incorrectly in several places,
in a way that could lead to excessive CPU usage. Fixes bug 40286;
bugfix on 0.2.2.1-alpha. This bug is also tracked as TROVE-2021-
001 and CVE-2021-28089.
- Fix a bug in appending detached signatures to a pending consensus
document that could be used to crash a directory authority. Fixes
bug 40316; bugfix on 0.2.2.6-alpha. Tracked as TROVE-2021-002
and CVE-2021-28090.
o Minor features (geoip data):
- We have switched geoip data sources. Previously we shipped IP-to-
country mappings from Maxmind's GeoLite2, but in 2019 they changed
their licensing terms, so we were unable to update them after that
point. We now ship geoip files based on the IPFire Location
Database instead. (See https://location.ipfire.org/ for more
information). This release updates our geoip files to match the
IPFire Location Database as retrieved on 2021/03/12. Closes
ticket 40224.
o Minor bugfixes (directory authority):
- Now that exit relays don't allow exit connections to directory
authority DirPorts (to prevent network reentry), disable
authorities' reachability self test on the DirPort. Fixes bug
40287; bugfix on 0.4.5.5-rc.
o Minor bugfixes (documentation):
- Fix a formatting error in the documentation for
VirtualAddrNetworkIPv6. Fixes bug 40256; bugfix on 0.2.9.4-alpha.
o Minor bugfixes (Linux, relay):
- Fix a bug in determining total available system memory that would
have been triggered if the format of Linux's /proc/meminfo file
had ever changed to include "MemTotal:" in the middle of a line.
Fixes bug 40315; bugfix on 0.2.5.4-alpha.
o Minor bugfixes (metrics port):
- Fix a BUG() warning on the MetricsPort for an internal missing
handler. Fixes bug 40295; bugfix on 0.4.5.1-alpha.
o Minor bugfixes (onion service):
- Remove a harmless BUG() warning when reloading tor configured with
onion services. Fixes bug 40334; bugfix on 0.4.5.1-alpha.
o Minor bugfixes (portability):
- Fix a non-portable usage of "==" with "test" in the configure
script. Fixes bug 40298; bugfix on 0.4.5.1-alpha.
o Minor bugfixes (relay):
- Remove a spammy log notice falsely claiming that the IPv4/v6
address was missing. Fixes bug 40300; bugfix on 0.4.5.1-alpha.
- Do not query the address cache early in the boot process when
deciding if a relay needs to fetch early directory information
from an authority. This bug resulted in a relay falsely believing
it didn't have an address and thus triggering an authority fetch
at each boot. Related to our fix for 40300.
o Removed features (mallinfo deprecated):
- Remove mallinfo() usage entirely. Libc 2.33+ now deprecates it.
Closes ticket 40309.
Changes in version 0.4.5.6 - 2021-02-15
The Tor 0.4.5.x release series is dedicated to the memory of Karsten
Loesing (1979-2020), Tor developer, cypherpunk, husband, and father.
Karsten is best known for creating the Tor metrics portal and leading
the metrics team, but he was involved in Tor from the early days. For
example, while he was still a student he invented and implemented the
v2 onion service directory design, and he also served as an ambassador
to the many German researchers working in the anonymity field. We
loved him and respected him for his patience, his consistency, and his
welcoming approach to growing our community.
This release series introduces significant improvements in relay IPv6
address discovery, a new "MetricsPort" mechanism for relay operators
to measure performance, LTTng support, build system improvements to
help when using Tor as a static library, and significant bugfixes
related to Windows relay performance. It also includes numerous
smaller features and bugfixes.
Below are the changes since 0.4.4.4-rc. For a complete list of changes
since 0.4.4.7, see the ReleaseNotes file.
o Major bugfixes (IPv6, relay):
- Fix a bug that prevented a relay from publishing its descriptor if
an auto-discovered IPv6 that was found unreachable. Fixes bug
40279; bugfix on 0.4.5.1-alpha.
o Minor features (protocol versions):
- Stop claiming to support the "DirCache=1" subprotocol version.
Technically, we stopped supporting this subprotocol back in
0.4.5.1-alpha, but we needed to wait for the authorities to stop
listing it as "required" before we could drop it from the list.
Closes ticket 40221.
o Minor bugfixes (logging):
- Avoid a spurious log message about missing subprotocol versions,
when the consensus that we're reading from is older than the
current release. Previously we had made this message nonfatal, but
in practice, it is never relevant when the consensus is older than
the current release. Fixes bug 40281; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (metrics port):
- Fix a bug warning when a metrics port socket was unexpectedly
closed. Fixes bug 40257; bugfix on 0.4.5.1-alpha
o Minor bugfixes (relay):
- Allow relays to have a RFC1918 address if PublishServerDescriptor
is set to 0 and AssumeReachable is set to 1. This is to support
the use case of a bridge on a local network, exposed via a
pluggable transport. Fixes bug 40208; bugfix on 0.4.5.1-alpha.
o Minor bugfixes (relay, config):
- Fix a problem in the removal of duplicate ORPorts from the
internal port list when loading the config file. We were removing
the wrong ports, breaking valid torrc uses cases for multiple
ORPorts of the same address family. Fixes bug 40289; bugfix
on 0.4.5.1-alpha.
Changes in version 0.4.4.7 - 2021-02-03
Tor 0.4.4.7 backports numerous bugfixes from later releases,
including one that made v3 onion services more susceptible to
denial-of-service attacks, and a feature that makes some kinds of
DoS attacks harder to perform.
o Major bugfixes (onion service v3, backport from 0.4.5.3-rc):
- Stop requiring a live consensus for v3 clients and services, and
allow a "reasonably live" consensus instead. This allows v3 onion
services to work even if the authorities fail to generate a
consensus for more than 2 hours in a row. Fixes bug 40237; bugfix
on 0.3.5.1-alpha.
o Major feature (exit, backport from 0.4.5.5-rc):
- Re-entry into the network is now denied at the Exit level to all
relays' ORPorts and authorities' ORPorts and DirPorts. This change
should help mitgate a set of denial-of-service attacks. Closes
ticket 2667.
o Minor feature (build system, backport from 0.4.5.4-rc):
- New "make lsp" command to generate the compile_commands.json file
used by the ccls language server. The "bear" program is needed for
this. Closes ticket 40227.
o Minor features (compilation, backport from 0.4.5.2-rc):
- Disable deprecation warnings when building with OpenSSL 3.0.0 or
later. There are a number of APIs newly deprecated in OpenSSL
3.0.0 that Tor still requires. (A later version of Tor will try to
stop depending on these APIs.) Closes ticket 40165.
o Minor features (crypto, backport from 0.4.5.3-rc):
- Fix undefined behavior on our Keccak library. The bug only
appeared on platforms with 32-byte CPU cache lines (e.g. armv5tel)
and would result in wrong digests. Fixes bug 40210; bugfix on
0.2.8.1-alpha. Thanks to Bernhard Übelacker, Arnd Bergmann and
weasel for diagnosing this.
o Minor bugfixes (compatibility, backport from 0.4.5.1-rc):
- Strip '\r' characters when reading text files on Unix platforms.
This should resolve an issue where a relay operator migrates a
relay from Windows to Unix, but does not change the line ending of
Tor's various state files to match the platform, and the CRLF line
endings from Windows end up leaking into other files such as the
extra-info document. Fixes bug 33781; bugfix on 0.0.9pre5.
o Minor bugfixes (compilation, backport from 0.4.5.3-rc):
- Fix a compilation warning about unreachable fallthrough
annotations when building with "--enable-all-bugs-are-fatal" on
some compilers. Fixes bug 40241; bugfix on 0.3.5.4-alpha.
o Minor bugfixes (SOCKS5, backport from 0.4.5.3-rc):
- Handle partial SOCKS5 messages correctly. Previously, our code
would send an incorrect error message if it got a SOCKS5 request
that wasn't complete. Fixes bug 40190; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (testing, backport from 0.4.5.2-alpha):
- Fix the `config/parse_tcp_proxy_line` test so that it works
correctly on systems where the DNS provider hijacks invalid
queries. Fixes part of bug 40179; bugfix on 0.4.3.1-alpha.
- Fix our Python reference-implementation for the v3 onion service
handshake so that it works correctly with the version of hashlib
provided by Python 3.9. Fixes part of bug 40179; bugfix
on 0.3.1.6-rc.
- Fix the `tortls/openssl/log_one_error` test to work with OpenSSL
3.0.0. Fixes bug 40170; bugfix on 0.2.8.1-alpha.
Changes in version 0.4.3.8 - 2021-02-03
Tor 0.4.3.8 backports numerous bugfixes from later releases,
including one that made v3 onion services more susceptible to
denial-of-service attacks, and a feature that makes some kinds of
DoS attacks harder to perform.
Note that this is, in all likelihood, the last release of Tor 0.4.3.x,
which will reach end-of-life on 15 Feb 2021.
o Major bugfixes (onion service v3, backport from 0.4.5.3-rc):
- Stop requiring a live consensus for v3 clients and services, and
allow a "reasonably live" consensus instead. This allows v3 onion
services to work even if the authorities fail to generate a
consensus for more than 2 hours in a row. Fixes bug 40237; bugfix
on 0.3.5.1-alpha.
o Major bugfixes (stats, onion services, backport from 0.4.4.5):
- Fix a bug where we were undercounting the Tor network's total
onion service traffic, by ignoring any traffic originating from
clients. Now we count traffic from both clients and services.
Fixes bug 40117; bugfix on 0.2.6.2-alpha.
o Major feature (exit, backport from 0.4.5.5-rc):
- Re-entry into the network is now denied at the Exit level to all
relays' ORPorts and authorities' ORPorts and DirPorts. This change
should help mitgate a set of denial-of-service attacks. Closes
ticket 2667.
o Minor feature (build system, backport from 0.4.5.4-rc):
- New "make lsp" command to generate the compile_commands.json file
used by the ccls language server. The "bear" program is needed for
this. Closes ticket 40227.
o Minor features (compilation, backport from 0.4.5.2-rc):
- Disable deprecation warnings when building with OpenSSL 3.0.0 or
later. There are a number of APIs newly deprecated in OpenSSL
3.0.0 that Tor still requires. (A later version of Tor will try to
stop depending on these APIs.) Closes ticket 40165.
o Minor features (crypto, backport from 0.4.5.3-rc):
- Fix undefined behavior on our Keccak library. The bug only
appeared on platforms with 32-byte CPU cache lines (e.g. armv5tel)
and would result in wrong digests. Fixes bug 40210; bugfix on
0.2.8.1-alpha. Thanks to Bernhard Übelacker, Arnd Bergmann and
weasel for diagnosing this.
o Minor bugfixes (compatibility, backport from 0.4.5.1-rc):
- Strip '\r' characters when reading text files on Unix platforms.
This should resolve an issue where a relay operator migrates a
relay from Windows to Unix, but does not change the line ending of
Tor's various state files to match the platform, and the CRLF line
endings from Windows end up leaking into other files such as the
extra-info document. Fixes bug 33781; bugfix on 0.0.9pre5.
o Minor bugfixes (compilation, backport from 0.4.5.1-rc):
- Resolve a compilation warning that could occur in
test_connection.c. Fixes bug 40113; bugfix on 0.2.9.3-alpha.
o Minor bugfixes (compilation, backport from 0.4.5.3-rc):
- Fix a compilation warning about unreachable fallthrough
annotations when building with "--enable-all-bugs-are-fatal" on
some compilers. Fixes bug 40241; bugfix on 0.3.5.4-alpha.
o Minor bugfixes (SOCKS5, backport from 0.4.5.3-rc):
- Handle partial SOCKS5 messages correctly. Previously, our code
would send an incorrect error message if it got a SOCKS5 request
that wasn't complete. Fixes bug 40190; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (testing, backport from 0.4.5.2-alpha):
- Fix the `config/parse_tcp_proxy_line` test so that it works
correctly on systems where the DNS provider hijacks invalid
queries. Fixes part of bug 40179; bugfix on 0.4.3.1-alpha.
- Fix our Python reference-implementation for the v3 onion service
handshake so that it works correctly with the version of hashlib
provided by Python 3.9. Fixes part of bug 40179; bugfix
on 0.3.1.6-rc.
- Fix the `tortls/openssl/log_one_error` test to work with OpenSSL
3.0.0. Fixes bug 40170; bugfix on 0.2.8.1-alpha.
Changes in version 0.3.5.13 - 2020-02-03
Tor 0.3.5.13 backports numerous bugfixes from later releases,
including one that made v3 onion services more susceptible to
denial-of-service attacks, and a feature that makes some kinds of
DoS attacks harder to perform.
o Major bugfixes (onion service v3, backport from 0.4.5.3-rc):
- Stop requiring a live consensus for v3 clients and services, and
allow a "reasonably live" consensus instead. This allows v3 onion
services to work even if the authorities fail to generate a
consensus for more than 2 hours in a row. Fixes bug 40237; bugfix
on 0.3.5.1-alpha.
o Major bugfixes (stats, onion services, backport from 0.4.4.5):
- Fix a bug where we were undercounting the Tor network's total
onion service traffic, by ignoring any traffic originating from
clients. Now we count traffic from both clients and services.
Fixes bug 40117; bugfix on 0.2.6.2-alpha.
o Major feature (exit, backport from 0.4.5.5-rc):
- Re-entry into the network is now denied at the Exit level to all
relays' ORPorts and authorities' ORPorts and DirPorts. This change
should help mitigate a set of denial-of-service attacks. Closes
ticket 2667.
o Minor feature (build system, backport from 0.4.5.4-rc):
- New "make lsp" command to generate the compile_commands.json file
used by the ccls language server. The "bear" program is needed for
this. Closes ticket 40227.
o Minor features (compilation, backport from 0.4.5.2-rc):
- Disable deprecation warnings when building with OpenSSL 3.0.0 or
later. There are a number of APIs newly deprecated in OpenSSL
3.0.0 that Tor still requires. (A later version of Tor will try to
stop depending on these APIs.) Closes ticket 40165.
o Minor features (crypto, backport from 0.4.5.3-rc):
- Fix undefined behavior on our Keccak library. The bug only
appeared on platforms with 32-byte CPU cache lines (e.g. armv5tel)
and would result in wrong digests. Fixes bug 40210; bugfix on
0.2.8.1-alpha. Thanks to Bernhard Übelacker, Arnd Bergmann and
weasel for diagnosing this.
o Minor bugfixes (compatibility, backport from 0.4.5.1-rc):
- Strip '\r' characters when reading text files on Unix platforms.
This should resolve an issue where a relay operator migrates a
relay from Windows to Unix, but does not change the line ending of
Tor's various state files to match the platform, and the CRLF line
endings from Windows end up leaking into other files such as the
extra-info document. Fixes bug 33781; bugfix on 0.0.9pre5.
o Minor bugfixes (compilation, backport from 0.4.5.1-rc):
- Resolve a compilation warning that could occur in
test_connection.c. Fixes bug 40113; bugfix on 0.2.9.3-alpha.
o Minor bugfixes (compilation, backport from 0.4.5.3-rc):
- Fix a compilation warning about unreachable fallthrough
annotations when building with "--enable-all-bugs-are-fatal" on
some compilers. Fixes bug 40241; bugfix on 0.3.5.4-alpha.
o Minor bugfixes (SOCKS5, backport from 0.4.5.3-rc):
- Handle partial SOCKS5 messages correctly. Previously, our code
would send an incorrect error message if it got a SOCKS5 request
that wasn't complete. Fixes bug 40190; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (testing, backport from 0.4.5.2-alpha):
- Fix our Python reference-implementation for the v3 onion service
handshake so that it works correctly with the version of hashlib
provided by Python 3.9. Fixes part of bug 40179; bugfix
on 0.3.1.6-rc.
- Fix the `tortls/openssl/log_one_error` test to work with OpenSSL
3.0.0. Fixes bug 40170; bugfix on 0.2.8.1-alpha.
Changes in version 0.4.5.5-rc - 2021-02-01
Tor 0.4.5.5-rc is the third release candidate in its series. We're
coming closer and closer to a stable release series. This release
fixes an annoyance with address detection code, and somewhat mitigates
an ongoing denial-of-service attack.
We anticipate no more code changes between this and the stable
release, though of course that could change.
o Major feature (exit):
- Re-entry into the network is now denied at the Exit level to all
relays' ORPorts and authorities' ORPorts and DirPorts. This change
should help mitgate a set of denial-of-service attacks. Closes
ticket 2667.
o Minor bugfixes (relay, configuration):
- Don't attempt to discover our address (IPv4 or IPv6) if no ORPort
for it can be found in the configuration. Fixes bug 40254; bugfix
on 0.4.5.1-alpha.
Changes in version 0.4.5.4-rc - 2021-01-22
Tor 0.4.5.4-rc is the second release candidate in its series. It fixes
several bugs present in previous releases.
We expect that the stable release will be the same, or almost the
same, as this release candidate, unless serious bugs are found.
o Major bugfixes (authority, IPv6):
- Do not consider multiple relays in the same IPv6 /64 network to be
sybils. Fixes bug 40243; bugfix on 0.4.5.1-alpha.
o Major bugfixes (directory cache, performance, windows):
- Limit the number of items in the consensus diff cache to 64 on
Windows. We hope this will mitigate an issue where Windows relay
operators reported Tor using 100% CPU, while we investigate better
solutions. Fixes bug 24857; bugfix on 0.3.1.1-alpha.
o Minor feature (build system):
- New "make lsp" command to generate the compile_commands.json file
used by the ccls language server. The "bear" program is needed for
this. Closes ticket 40227.
o Minor features (authority, logging):
- Log more information for directory authority operators during the
consensus voting process, and while processing relay descriptors.
Closes ticket 40245.
- Reject obsolete router/extrainfo descriptors earlier and more
quietly, to avoid spamming the logs. Fixes bug 40238; bugfix
on 0.4.5.1-alpha.
o Minor bugfixes (compilation):
- Fix another warning about unreachable fallthrough annotations when
building with "--enable-all-bugs-are-fatal" on some compilers.
Fixes bug 40241; bugfix on 0.4.5.3-rc.
- Change the linker flag ordering in our library search code so that
it works for compilers that need the libraries to be listed in the
right order. Fixes bug 33624; bugfix on 0.1.1.0-alpha.
o Minor bugfixes (config, bridge):
- Don't initiate a connection to a bridge configured to use a
missing transport. This change reverts an earlier fix that would
try to avoid such situations during configuration chcecking, but
which doesn't work with DisableNetwork. Fixes bug 40106; bugfix
on 0.4.5.1-alpha.
o Minor bugfixes (onion services):
- Avoid a non-fatal assertion in certain edge-cases when
establishing a circuit to an onion service. Fixes bug 32666;
bugfix on 0.3.0.3-alpha.
o Minor bugfixes (relay):
- If we were unable to build our descriptor, don't mark it as having
been advertised. Also remove an harmless BUG(). Fixes bug 40231;
bugfix on 0.4.5.1-alpha.
Changes in version 0.4.5.3-rc - 2021-01-12
Tor 0.4.5.3-rc is the first release candidate in its series. It fixes
several bugs, including one that broke onion services on certain older
ARM CPUs, and another that made v3 onion services less reliable.
Though we anticipate that we'll be doing a bit more clean-up between
now and the stable release, we expect that our remaining changes will
be fairly simple. There will be at least one more release candidate
before 0.4.5.x is stable.
o Major bugfixes (onion service v3):
- Stop requiring a live consensus for v3 clients and services, and
allow a "reasonably live" consensus instead. This allows v3 onion
services to work even if the authorities fail to generate a
consensus for more than 2 hours in a row. Fixes bug 40237; bugfix
on 0.3.5.1-alpha.
o Minor features (crypto):
- Fix undefined behavior on our Keccak library. The bug only
appeared on platforms with 32-byte CPU cache lines (e.g. armv5tel)
and would result in wrong digests. Fixes bug 40210; bugfix on
0.2.8.1-alpha. Thanks to Bernhard Übelacker, Arnd Bergmann and
weasel for diagnosing this.
o Minor features (documentation):
- Mention the "!badexit" directive that can appear in an authority's
approved-routers file, and update the description of the
"!invalid" directive. Closes ticket 40188.
o Minor bugfixes (compilation):
- Fix a compilation warning about unreachable fallthrough
annotations when building with "--enable-all-bugs-are-fatal" on
some compilers. Fixes bug 40241; bugfix on 0.3.5.4-alpha.
- Fix the "--enable-static-tor" switch to properly set the "-static"
compile option onto the tor binary only. Fixes bug 40111; bugfix
on 0.2.3.1-alpha.
o Minor bugfixes (config, bridge):
- Really fix the case where torrc has a missing ClientTransportPlugin
but is configured with a Bridge line and UseBridges. Previously,
we didn't look at the managed proxy list and thus would fail for
the "exec" case. Fixes bug 40106; bugfix on 0.4.5.1-alpha.
o Minor bugfixes (logging, relay):
- Log our address as reported by the directory authorities, if none
was configured or detected before. Fixes bug 40201; bugfix
on 0.4.5.1-alpha.
- When a launching bandwidth testing circuit, don't incorrectly call
it a reachability test, or trigger a "CHECKING_REACHABILITY"
control event. Fixes bug 40205; bugfix on 0.4.5.1-alpha.
o Minor bugfixes (relay, statistics):
- Report the correct connection statistics in our extrainfo
documents. Previously there was a problem in the file loading
function which would wrongly truncate a state file, causing the
wrong information to be reported. Fixes bug 40226; bugfix
on 0.4.5.1-alpha.
o Minor bugfixes (SOCKS5):
- Handle partial SOCKS5 messages correctly. Previously, our code
would send an incorrect error message if it got a SOCKS5 request
that wasn't complete. Fixes bug 40190; bugfix on 0.3.5.1-alpha.
Changes in version 0.4.5.2-alpha - 2020-11-23
Tor 0.4.5.2-alpha is the second alpha release in the 0.4.5.x series.
It fixes several bugs present in earlier releases, including one that
made it impractical to run relays on Windows. It also adds a few small
safety features to improve Tor's behavior in the presence of strange
compile-time options, misbehaving proxies, and future versions
of OpenSSL.
o Major bugfixes (relay, windows):
- Fix a bug in our implementation of condition variables on Windows.
Previously, a relay on Windows would use 100% CPU after running
for some time. Because of this change, Tor now require Windows
Vista or later to build and run. Fixes bug 30187; bugfix on
0.2.6.3-alpha. (This bug became more serious in 0.3.1.1-alpha with
the introduction of consensus diffs.) Patch by Daniel Pinto.
o Minor features (compilation):
- Disable deprecation warnings when building with OpenSSL 3.0.0 or
later. There are a number of APIs newly deprecated in OpenSSL
3.0.0 that Tor still requires. (A later version of Tor will try to
stop depending on these APIs.) Closes ticket 40165.
o Minor features (protocol, proxy support, defense in depth):
- Respond more deliberately to misbehaving proxies that leave
leftover data on their connections, so as to make Tor even less
likely to allow the proxies to pass their data off as having come
from a relay. Closes ticket 40017.
o Minor features (safety):
- Log a warning at startup if Tor is built with compile-time options
that are likely to make it less stable or reliable. Closes
ticket 18888.
o Minor bugfixes (circuit, handshake):
- In the v3 handshaking code, use connection_or_change_state() to
change the state. Previously, we changed the state directly, but
this did not pass the state change to the pubsub or channel
objects, potentially leading to bugs. Fixes bug 32880; bugfix on
0.2.3.6-alpha. Patch by Neel Chauhan.
o Minor bugfixes (compilation):
- Use the correct 'ranlib' program when building libtor.a.
Previously we used the default ranlib, which broke some kinds of
cross-compilation. Fixes bug 40172; bugfix on 0.4.5.1-alpha.
- Remove a duplicate typedef in metrics_store.c. Fixes bug 40177;
bugfix on 0.4.5.1-alpha.
- When USDT tracing is enabled, and STAP_PROBEV() is missing, don't
attempt to build. Linux supports that macro but not the BSDs.
Fixes bug 40174; bugfix on 0.4.5.1-alpha.
o Minor bugfixes (configuration):
- Exit Tor on a misconfiguration when the Bridge line is configured
to use a transport but no corresponding ClientTransportPlugin can
be found. Prior to this fix, Tor would attempt to connect to the
bridge directly without using the transport, making it easier for
adversaries to notice the bridge. Fixes bug 25528; bugfix
on 0.2.6.1-alpha.
- Fix an issue where an ORPort was compared with other kinds of
ports, when it should have been only checked against other
ORPorts. This bug would lead to "DirPort auto" getting ignored.
Fixes bug 40195; bugfix on 0.4.5.1-alpha.
- Fix a bug where a second non-ORPort with a variant family (ex:
SocksPort [::1]:9050) would be ignored due to a configuration
parsing error. Fixes bug 40183; bugfix on 0.4.5.1-alpha.
o Minor bugfixes (crash, relay, signing key):
- Avoid assertion failures when we run Tor from the command line
with `--key-expiration sign`, but an ORPort is not set. Fixes bug
40015; bugfix on 0.3.2.1-alpha. Patch by Neel Chauhan.
o Minor bugfixes (logging):
- Remove trailing whitespace from control event log messages. Fixes
bug 32178; bugfix on 0.1.1.1-alpha. Based on a patch by
Amadeusz Pawlik.
- Turn warning-level log message about SENDME failure into a debug-
level message. (This event can happen naturally, and is no reason
for concern). Fixes bug 40142; bugfix on 0.4.1.1-alpha.
o Minor bugfixes (relay, address discovery):
- Don't trigger an IP change when no new valid IP can be found.
Fixes bug 40071; bugfix on 0.4.5.1-alpha.
- When attempting to discover our IP, use a simple test circuit,
rather than a descriptor fetch: the same address information is
present in NETINFO cells, and is better authenticated there. Fixes
bug 40071; bugfix on 0.4.5.1-alpha.
o Minor bugfixes (testing):
- Fix the `config/parse_tcp_proxy_line` test so that it works
correctly on systems where the DNS provider hijacks invalid
queries. Fixes part of bug 40179; bugfix on 0.4.3.1-alpha.
- Fix unit tests that used newly generated list of routers so that
they check them with respect to the date when they were generated,
not with respect to the current time. Fixes bug 40187; bugfix
on 0.4.5.1-alpha.
- Fix our Python reference-implementation for the v3 onion service
handshake so that it works correctly with the version of hashlib
provided by Python 3.9. Fixes part of bug 40179; bugfix
on 0.3.1.6-rc.
- Fix the `tortls/openssl/log_one_error` test to work with OpenSSL
3.0.0. Fixes bug 40170; bugfix on 0.2.8.1-alpha.
o Removed features (controller):
- Remove the "GETINFO network-status" controller command. It has
been deprecated since 0.3.1.1-alpha. Closes ticket 22473.
Changes in version 0.4.4.6 - 2020-11-12
Tor 0.4.4.6 is the second stable release in the 0.4.4.x series. It
backports fixes from later releases, including a fix for TROVE-2020-
005, a security issue that could be used, under certain cases, by an
adversary to observe traffic patterns on a limited number of circuits
intended for a different relay.
o Major bugfixes (security, backport from 0.4.5.1-alpha):
- When completing a channel, relays now check more thoroughly to
make sure that it matches any pending circuits before attaching
those circuits. Previously, address correctness and Ed25519
identities were not checked in this case, but only when extending
circuits on an existing channel. Fixes bug 40080; bugfix on
0.2.7.2-alpha. Resolves TROVE-2020-005.
o Minor features (directory authorities, backport from 0.4.5.1-alpha):
- Authorities now list a different set of protocols as required and
recommended. These lists have been chosen so that only truly
recommended and/or required protocols are included, and so that
clients using 0.2.9 or later will continue to work (even though
they are not supported), whereas only relays running 0.3.5 or
later will meet the requirements. Closes ticket 40162.
- Make it possible to specify multiple ConsensusParams torrc lines.
Now directory authority operators can for example put the main
ConsensusParams config in one torrc file and then add to it from a
different torrc file. Closes ticket 40164.
o Minor features (subprotocol versions, backport from 0.4.5.1-alpha):
- Tor no longer allows subprotocol versions larger than 63.
Previously version numbers up to UINT32_MAX were allowed, which
significantly complicated our code. Implements proposal 318;
closes ticket 40133.
o Minor features (tests, v2 onion services, backport from 0.4.5.1-alpha):
- Fix a rendezvous cache unit test that was triggering an underflow
on the global rend cache allocation. Fixes bug 40125; bugfix
on 0.2.8.1-alpha.
- Fix another rendezvous cache unit test that was triggering an
underflow on the global rend cache allocation. Fixes bug 40126;
bugfix on 0.2.8.1-alpha.
o Minor bugfixes (compilation, backport from 0.4.5.1-alpha):
- Fix compiler warnings that would occur when building with
"--enable-all-bugs-are-fatal" and "--disable-module-relay" at the
same time. Fixes bug 40129; bugfix on 0.4.4.1-alpha.
- Resolve a compilation warning that could occur in
test_connection.c. Fixes bug 40113; bugfix on 0.2.9.3-alpha.
o Minor bugfixes (logging, backport from 0.4.5.1-alpha):
- Remove a debug logging statement that uselessly spammed the logs.
Fixes bug 40135; bugfix on 0.3.5.0-alpha.
o Minor bugfixes (relay configuration, crash, backport from 0.4.5.1-alpha):
- Avoid a fatal assert() when failing to create a listener
connection for an address that was in use. Fixes bug 40073; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (v2 onion services, backport from 0.4.5.1-alpha):
- For HSFETCH commands on v2 onion services addresses, check the
length of bytes decoded, not the base32 length. Fixes bug 34400;
bugfix on 0.4.1.1-alpha. Patch by Neel Chauhan.
Changes in version 0.4.3.7 - 2020-11-12
Tor 0.4.3.7 backports several bugfixes from later releases. It
includes a fix for TROVE-2020-005, a security issue that could be
used, under certain cases, by an adversary to observe traffic patterns
on a limited number of circuits intended for a different relay.
Please be aware that support for the 0.4.3.x series will end on 15
February 2021. Please upgrade to 0.4.4.x or 0.4.5.x before then, or
downgrade to 0.3.5.x, which will be supported until at least 1
February 2022.
o Major features (fallback directory list, backport form 0.4.4.3-alpha):
- Replace the 148 fallback directories originally included in Tor
0.4.1.4-rc (of which around 105 are still functional) with a list
of 144 fallbacks generated in July 2020. Closes ticket 40061.
o Major bugfixes (security, backport from 0.4.5.1-alpha):
- When completing a channel, relays now check more thoroughly to
make sure that it matches any pending circuits before attaching
those circuits. Previously, address correctness and Ed25519
identities were not checked in this case, but only when extending
circuits on an existing channel. Fixes bug 40080; bugfix on
0.2.7.2-alpha. Resolves TROVE-2020-005.
o Major bugfixes (NSS, backport from 0.4.4.3-alpha):
- When running with NSS enabled, make sure that NSS knows to expect
nonblocking sockets. Previously, we set our TCP sockets as
nonblocking, but did not tell NSS, which in turn could lead to
unexpected blocking behavior. Fixes bug 40035; bugfix
on 0.3.5.1-alpha.
o Minor features (security, backport from 0.4.4.4-rc):
- Channels using obsolete versions of the Tor link protocol are no
longer allowed to circumvent address-canonicity checks. (This is
only a minor issue, since such channels have no way to set ed25519
keys, and therefore should always be rejected for circuits that
specify ed25519 identities.) Closes ticket 40081.
o Minor features (subprotocol versions, backport from 0.4.5.1-alpha):
- Tor no longer allows subprotocol versions larger than 63.
Previously version numbers up to UINT32_MAX were allowed, which
significantly complicated our code. Implements proposal 318;
closes ticket 40133.
o Minor features (tests, backport from 0.4.4.5):
- Our "make check" target now runs the unit tests in 8 parallel
chunks. Doing this speeds up hardened CI builds by more than a
factor of two. Closes ticket 40098.
o Minor features (tests, v2 onion services, backport from 0.4.5.1-alpha):
- Fix a rendezvous cache unit test that was triggering an underflow
on the global rend cache allocation. Fixes bug 40125; bugfix
on 0.2.8.1-alpha.
- Fix another rendezvous cache unit test that was triggering an
underflow on the global rend cache allocation. Fixes bug 40126;
bugfix on 0.2.8.1-alpha.
o Minor bugfixes (correctness, buffers, backport from 0.4.4.4-rc):
- Fix a correctness bug that could cause an assertion failure if we
ever tried using the buf_move_all() function with an empty input
buffer. As far as we know, no released versions of Tor do this.
Fixes bug 40076; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (logging, backport from 0.4.5.1-alpha):
- Remove a debug logging statement that uselessly spammed the logs.
Fixes bug 40135; bugfix on 0.3.5.0-alpha.
o Minor bugfixes (rate limiting, bridges, pluggable transports, backport from 0.4.4.4-rc):
- On a bridge, treat all connections from an ExtORPort as remote by
default for the purposes of rate-limiting. Previously, bridges
would treat the connection as local unless they explicitly
received a "USERADDR" command. ExtORPort connections still count
as local if there is a USERADDR command with an explicit local
address. Fixes bug 33747; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (relay configuration, crash, backport from 0.4.5.1-alpha):
- Avoid a fatal assert() when failing to create a listener
connection for an address that was in use. Fixes bug 40073; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (relay, usability, backport from 0.4.4.3-alpha):
- Adjust the rules for when to warn about having too many
connections to other relays. Previously we'd tolerate up to 1.5
connections per relay on average. Now we tolerate more connections
for directory authorities, and raise the number of total
connections we need to see before we warn. Fixes bug 33880; bugfix
on 0.3.1.1-alpha.
o Minor bugfixes (tests, 0.4.4.5):
- Fix the behavior of the rend_cache/clean_v2_descs_as_dir when run
on its own. Previously, it would exit with an error. Fixes bug
40099; bugfix on 0.2.8.1-alpha.
o Minor bugfixes (v2 onion services, backport from 0.4.5.1-alpha):
- For HSFETCH commands on v2 onion services addresses, check the
length of bytes decoded, not the base32 length. Fixes bug 34400;
bugfix on 0.4.1.1-alpha. Patch by Neel Chauhan.
o Minor bugfixes (windows, backport from 0.4.4.4-rc):
- Fix a bug that prevented Tor from starting if its log file grew
above 2GB. Fixes bug 31036; bugfix on 0.2.1.8-alpha.
o Deprecated features (onion service v2, backport form 0.4.4.2-alpha):
- Add a deprecation warning for version 2 onion services. Closes
ticket 40003.
o Removed features (backport from 0.4.4.3-alpha):
- Our "check-local" test target no longer tries to use the
Coccinelle semantic patching tool parse all the C files. While it
is a good idea to try to make sure Coccinelle works on our C
before we run a Coccinelle patch, doing so on every test run has
proven to be disruptive. You can still run this tool manually with
"make check-cocci". Closes ticket 40030. ticket 40030.
Changes in version 0.3.5.12 - 2020-11-12
Tor 0.4.3.7 backports several bugfixes from later releases. It
includes a fix for TROVE-2020-005, a security issue that could be
used, under certain cases, by an adversary to observe traffic patterns
on a limited number of circuits intended for a different relay.
o Major features (fallback directory list, backport form 0.4.4.3-alpha):
- Replace the 148 fallback directories originally included in Tor
0.4.1.4-rc (of which around 105 are still functional) with a list
of 144 fallbacks generated in July 2020. Closes ticket 40061.
o Major bugfixes (security, backport from 0.4.5.1-alpha):
- When completing a channel, relays now check more thoroughly to
make sure that it matches any pending circuits before attaching
those circuits. Previously, address correctness and Ed25519
identities were not checked in this case, but only when extending
circuits on an existing channel. Fixes bug 40080; bugfix on
0.2.7.2-alpha. Resolves TROVE-2020-005.
o Major bugfixes (NSS, backport from 0.4.4.3-alpha):
- When running with NSS enabled, make sure that NSS knows to expect
nonblocking sockets. Previously, we set our TCP sockets as
nonblocking, but did not tell NSS, which in turn could lead to
unexpected blocking behavior. Fixes bug 40035; bugfix
on 0.3.5.1-alpha.
o Minor features (security, backport from 0.4.4.4-rc):
- Channels using obsolete versions of the Tor link protocol are no
longer allowed to circumvent address-canonicity checks. (This is
only a minor issue, since such channels have no way to set ed25519
keys, and therefore should always be rejected for circuits that
specify ed25519 identities.) Closes ticket 40081.
o Minor features (debugging, directory system):
- Don't crash when we find a non-guard with a guard-fraction value
set. Instead, log a bug warning, in an attempt to figure out how
this happened. Diagnostic for ticket 32868.
o Minor features (subprotocol versions, backport from 0.4.5.1-alpha):
- Tor no longer allows subprotocol versions larger than 63.
Previously version numbers up to UINT32_MAX were allowed, which
significantly complicated our code. Implements proposal 318;
closes ticket 40133.
o Minor features (tests, backport from 0.4.4.5):
- Our "make check" target now runs the unit tests in 8 parallel
chunks. Doing this speeds up hardened CI builds by more than a
factor of two. Closes ticket 40098.
o Minor features (tests, v2 onion services, backport from 0.4.5.1-alpha):
- Fix a rendezvous cache unit test that was triggering an underflow
on the global rend cache allocation. Fixes bug 40125; bugfix
on 0.2.8.1-alpha.
- Fix another rendezvous cache unit test that was triggering an
underflow on the global rend cache allocation. Fixes bug 40126;
bugfix on 0.2.8.1-alpha.
o Minor bugfixes (correctness, buffers, backport from 0.4.4.4-rc):
- Fix a correctness bug that could cause an assertion failure if we
ever tried using the buf_move_all() function with an empty input
buffer. As far as we know, no released versions of Tor do this.
Fixes bug 40076; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (logging, backport from 0.4.5.1-alpha):
- Remove a debug logging statement that uselessly spammed the logs.
Fixes bug 40135; bugfix on 0.3.5.0-alpha.
o Minor bugfixes (rate limiting, bridges, pluggable transports, backport from 0.4.4.4-rc):
- On a bridge, treat all connections from an ExtORPort as remote by
default for the purposes of rate-limiting. Previously, bridges
would treat the connection as local unless they explicitly
received a "USERADDR" command. ExtORPort connections still count
as local if there is a USERADDR command with an explicit local
address. Fixes bug 33747; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (relay configuration, crash, backport from 0.4.5.1-alpha):
- Avoid a fatal assert() when failing to create a listener
connection for an address that was in use. Fixes bug 40073; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (relay, usability, backport from 0.4.4.3-alpha):
- Adjust the rules for when to warn about having too many
connections to other relays. Previously we'd tolerate up to 1.5
connections per relay on average. Now we tolerate more connections
for directory authorities, and raise the number of total
connections we need to see before we warn. Fixes bug 33880; bugfix
on 0.3.1.1-alpha.
o Minor bugfixes (relays, backport from 0.4.4.1-alpha):
- Stop advertising incorrect IPv6 ORPorts in relay and bridge
descriptors, when the IPv6 port was configured as "auto". Fixes
bug 32588; bugfix on 0.2.3.9-alpha.
o Minor bugfixes (tests, 0.4.4.5):
- Fix the behavior of the rend_cache/clean_v2_descs_as_dir when run
on its own. Previously, it would exit with an error. Fixes bug
40099; bugfix on 0.2.8.1-alpha.
o Minor bugfixes (windows, backport from 0.4.4.4-rc):
- Fix a bug that prevented Tor from starting if its log file grew
above 2GB. Fixes bug 31036; bugfix on 0.2.1.8-alpha.
o Deprecated features (onion service v2, backport form 0.4.4.2-alpha):
- Add a deprecation warning for version 2 onion services. Closes
ticket 40003.
Changes in version 0.4.5.1-alpha - 2020-11-01
Tor 0.4.5.1-alpha is the first alpha release in the 0.4.5.x series. It
improves support for IPv6, address discovery and self-testing, code
metrics and tracing.
This release also fixes TROVE-2020-005, a security issue that could be
used, under certain cases, by an adversary to observe traffic patterns
on a limited number of circuits intended for a different relay. To
mount this attack, the adversary would need to actively extend
circuits to an incorrect address, as well as compromise a relay's
legacy RSA-1024 key. We'll be backporting this fix to other release
series soon, after it has had some testing.
Here are the changes since 0.4.4.5.
o Major features (build):
- When building Tor, first link all object files into a single
static library. This may help with embedding Tor in other
programs. Note that most Tor functions do not constitute a part of
a stable or supported API: only those functions in tor_api.h
should be used if embedding Tor. Closes ticket 40127.
o Major features (metrics):
- Introduce a new MetricsPort which exposes, through an HTTP
interface, a series of metrics that tor collects at runtime. At
the moment, the only supported output format is Prometheus data
model. Closes ticket 40063. See the manual page for more
information and security considerations.
o Major features (relay, IPv6):
- The torrc option Address now supports IPv6. This unifies our
address discovery interface to support IPv4, IPv6, and hostnames.
Closes ticket 33233.
- Launch IPv4 and IPv6 ORPort self-test circuits on relays and
bridges. Closes ticket 33222.
- Relays now automatically bind on IPv6 for their ORPort, unless
specified otherwise with the IPv4Only flag. Closes ticket 33246.
- When a relay with IPv6 support is told to open a connection to
another relay, and the extend cell lists both IPv4 and IPv6
addresses, the first relay now picks randomly which address to
use. Closes ticket 33220.
- Relays now track their IPv6 ORPort reachability separately from
the reachability of their IPv4 ORPort. They will not publish a
descriptor unless _both_ ports appear to be externally reachable.
Closes ticket 34067.
o Major features (tracing):
- Add event-tracing library support for USDT and LTTng-UST, and a
few tracepoints in the circuit subsystem. More will come
incrementally. This feature is compiled out by default: it needs
to be enabled at configure time. See documentation in
doc/HACKING/Tracing.md. Closes ticket 32910.
o Major bugfixes (security):
- When completing a channel, relays now check more thoroughly to
make sure that it matches any pending circuits before attaching
those circuits. Previously, address correctness and Ed25519
identities were not checked in this case, but only when extending
circuits on an existing channel. Fixes bug 40080; bugfix on
0.2.7.2-alpha. Resolves TROVE-2020-005.
o Major bugfixes (TLS, buffer):
- When attempting to read N bytes on a TLS connection, really try to
read all N bytes. Previously, Tor would stop reading after the
first TLS record, which can be smaller than the N bytes requested,
and not check for more data until the next mainloop event. Fixes
bug 40006; bugfix on 0.1.0.5-rc.
o Minor features (address discovery):
- If no Address statements are found, relays now prioritize guessing
their address by looking at the local interface instead of the
local hostname. If the interface address can't be found, the local
hostname is used. Closes ticket 33238.
o Minor features (admin tools):
- Add a new --format argument to -key-expiration option to allow
specifying the time format of the expiration date. Adds Unix
timestamp format support. Patch by Daniel Pinto. Closes
ticket 30045.
o Minor features (bootstrap reporting):
- When reporting bootstrapping status on a relay, do not consider
connections that have never been the target of an origin circuit.
Previously, all connection failures were treated as potential
bootstrapping failures, including connections that had been opened
because of client requests. Closes ticket 25061.
o Minor features (build):
- When running the configure script, try to detect version
mismatches between the OpenSSL headers and libraries, and suggest
that the user should try "--with-openssl-dir". Closes 40138.
- If the configure script has given any warnings, remind the user
about them at the end of the script. Related to 40138.
o Minor features (configuration):
- Allow using wildcards (* and ?) with the %include option on
configuration files. Closes ticket 25140. Patch by Daniel Pinto.
- Allow the configuration options EntryNodes, ExcludeNodes,
ExcludeExitNodes, ExitNodes, MiddleNodes, HSLayer2Nodes and
HSLayer3Nodes to be specified multiple times. Closes ticket 28361.
Patch by Daniel Pinto.
o Minor features (control port):
- Add a DROPTIMEOUTS command to drop circuit build timeout history
and reset the current timeout. Closes ticket 40002.
- When a stream enters the AP_CONN_STATE_CONTROLLER_WAIT status,
send a control port event. Closes ticket 32190. Patch by
Neel Chauhan.
- Introduce GETINFO "stats/ntor/{assigned/requested}" and
"stats/tap/{assigned/requested}" to get the NTor and TAP circuit
onion handshake counts respectively. Closes ticket 28279. Patch by
Neel Chauhan.
o Minor features (control port, IPv6):
- Tor relays now try to report to the controller when they are
launching an IPv6 self-test. Closes ticket 34068.
- Introduce "GETINFO address/v4" and "GETINFO address/v6" in the
control port to fetch the Tor host's respective IPv4 or IPv6
address. We keep "GETINFO address" for backwards-compatibility.
Closes ticket 40039. Patch by Neel Chauhan.
o Minor features (directory authorities):
- Authorities now list a different set of protocols as required and
recommended. These lists have been chosen so that only truly
recommended and/or required protocols are included, and so that
clients using 0.2.9 or later will continue to work (even though
they are not supported), whereas only relays running 0.3.5 or
later will meet the requirements. Closes ticket 40162.
- Add a new consensus method 30 that removes the unnecessary "="
padding from ntor-onion-key. Closes ticket 7869. Patch by
Daniel Pinto.
- Directory authorities now reject descriptors from relays running
Tor versions from the obsolete 0.4.1 series. Resolves ticket
34357. Patch by Neel Chauhan.
- Make it possible to specify multiple ConsensusParams torrc lines.
Now directory authority operators can for example put the main
ConsensusParams config in one torrc file and then add to it from a
different torrc file. Closes ticket 40164.
- The AssumeReachable option no longer stops directory authorities
from checking whether other relays are running. A new
AuthDirTestReachability option can be used to disable these
checks. Closes ticket 34445.
- When looking for possible Sybil attacks, also consider IPv6
addresses. Two routers are considered to have "the same" address
by this metric if they are in the same /64 network. Patch from
Maurice Pibouin. Closes ticket 7193.
o Minor features (directory authorities, IPv6):
- Make authorities add their IPv6 ORPort (if any) to the trusted
servers list. Authorities previously added only their IPv4
addresses. Closes ticket 32822.
o Minor features (ed25519, relay):
- Save a relay's base64-encoded ed25519 identity key to the data
directory in a file named fingerprint-ed25519. Closes ticket
30642. Patch by Neel Chauhan.
o Minor features (heartbeat):
- Include the total number of inbound and outbound IPv4 and IPv6
connections in the heartbeat message. Closes ticket 29113.
o Minor features (IPv6, ExcludeNodes):
- Handle IPv6 addresses in ExcludeNodes; previously they were
ignored. Closes ticket 34065. Patch by Neel Chauhan.
o Minor features (logging):
- Add the running glibc version to the log, and the compiled glibc
version to the library list returned when using --library-versions.
Patch from Daniel Pinto. Closes ticket 40047.
- Consider an HTTP 301 response to be an error (like a 404) when
processing a directory response. Closes ticket 40053.
- Log directory fetch statistics as a single line. Closes
ticket 40159.
- Provide more complete descriptions of our connections when logging
about them. Closes ticket 40041.
- When describing a relay in the logs, we now include its ed25519
identity. Closes ticket 22668.
o Minor features (onion services):
- Only overwrite an onion service's existing hostname file if its
contents are wrong. This enables read-only onion-service
directories. Resolves ticket 40062. Patch by Neel Chauhan.
o Minor features (pluggable transports):
- Add an OutboundBindAddressPT option to allow users to specify
which IPv4 and IPv6 address pluggable transports should use for
outgoing IP packets. Tor does not have a way to enforce that the
pluggable transport honors this option, so each pluggable transport
needs to implement support on its own. Closes ticket 5304.
o Minor features (relay address tracking):
- We now store relay addresses for OR connections in a more logical
way. Previously we would sometimes overwrite the actual address of
a connection with a "canonical address", and then store the "real
address" elsewhere to remember it. We now track the "canonical
address" elsewhere for the cases where we need it, and leave the
connection's address alone. Closes ticket 33898.
o Minor features (relay):
- If a relay is unable to discover its address, attempt to learn it
from the NETINFO cell. Closes ticket 40022.
- Log immediately when launching a relay self-check. Previously we
would try to log before launching checks, or approximately when we
intended to launch checks, but this tended to be error-prone.
Closes ticket 34137.
o Minor features (relay, address discovery):
- If Address option is not found in torrc, attempt to learn our
address with the configured ORPort address if any. Closes
ticket 33236.
o Minor features (relay, IPv6):
- Add an AssumeReachableIPv6 option to disable self-checking IPv6
reachability. Closes part of ticket 33224.
- Add new "assume-reachable" and "assume-reachable-ipv6" consensus
parameters to be used in an emergency to tell relays that they
should publish even if they cannot complete their ORPort self-
checks. Closes ticket 34064 and part of 33224.
- Allow relays to send IPv6-only extend cells. Closes ticket 33222.
- Declare support for the Relay=3 subprotocol version. Closes
ticket 33226.
- When launching IPv6 ORPort self-test circuits, make sure that the
second-last hop can initiate an IPv6 extend. Closes ticket 33222.
o Minor features (specification update):
- Several fields in microdescriptors, router descriptors, and
consensus documents that were formerly optional are now required.
Implements proposal 315; closes ticket 40132.
o Minor features (state management):
- When loading the state file, remove entries from the statefile
that have been obsolete for a long time. Ordinarily Tor preserves
unrecognized entries in order to keep forward-compatibility, but
these entries have not actually been used in any release since
before 0.3.5.x. Closes ticket 40137.
o Minor features (statistics, ipv6):
- Relays now publish IPv6-specific counts of single-direction versus
bidirectional relay connections. Closes ticket 33264.
- Relays now publish their IPv6 read and write statistics over time,
if statistics are enabled. Closes ticket 33263.
o Minor features (subprotocol versions):
- Tor no longer allows subprotocol versions larger than 63.
Previously version numbers up to UINT32_MAX were allowed, which
significantly complicated our code. Implements proposal 318;
closes ticket 40133.
- Use the new limitations on subprotocol versions due to proposal
318 to simplify our implementation. Part of ticket 40133.
o Minor features (testing configuration):
- The TestingTorNetwork option no longer implicitly sets
AssumeReachable to 1. This change allows us to test relays' self-
testing mechanisms, and to test authorities' relay-testing
functionality. Closes ticket 34446.
o Minor features (testing):
- Added unit tests for channel_matches_target_addr_for_extend().
Closes Ticket 33919. Patch by MrSquanchee.
o Minor features (tests, v2 onion services):
- Fix a rendezvous cache unit test that was triggering an underflow
on the global rend cache allocation. Fixes bug 40125; bugfix
on 0.2.8.1-alpha.
- Fix another rendezvous cache unit test that was triggering an
underflow on the global rend cache allocation. Fixes bug 40126;
bugfix on 0.2.8.1-alpha.
o Minor bugfixes (circuit padding):
- When circpad_send_padding_cell_for_callback is called,
`is_padding_timer_scheduled` flag was not reset. Now it is set to
0 at the top of that function. Fixes bug 32671; bugfix
on 0.4.0.1-alpha.
- Add a per-circuit padding machine instance counter, so we can
differentiate between shutdown requests for old machines on a
circuit. Fixes bug 30992; bugfix on 0.4.1.1-alpha.
- Add the ability to keep circuit padding machines if they match a
set of circuit states or purposes. This allows us to have machines
that start up under some conditions but don't shut down under
others. We now use this mask to avoid starting up introduction
circuit padding again after the machines have already completed.
Fixes bug 32040; bugfix on 0.4.1.1-alpha.
o Minor bugfixes (compatibility):
- Strip '\r' characters when reading text files on Unix platforms.
This should resolve an issue where a relay operator migrates a
relay from Windows to Unix, but does not change the line ending of
Tor's various state files to match the platform, and the CRLF line
endings from Windows end up leaking into other files such as the
extra-info document. Fixes bug 33781; bugfix on 0.0.9pre5.
o Minor bugfixes (compilation):
- Fix compiler warnings that would occur when building with
"--enable-all-bugs-are-fatal" and "--disable-module-relay" at the
same time. Fixes bug 40129; bugfix on 0.4.4.1-alpha.
- Resolve a compilation warning that could occur in
test_connection.c. Fixes bug 40113; bugfix on 0.2.9.3-alpha.
o Minor bugfixes (configuration):
- Fix bug where %including a pattern ending with */ would include
files and folders (instead of folders only) in versions of glibc <
2.19. Fixes bug 40141; bugfix on 0.4.5.0-alpha-dev. Patch by
Daniel Pinto.
o Minor bugfixes (control port):
- Make sure we send the SOCKS request address in relay begin cells
when a stream is attached with the purpose
CIRCUIT_PURPOSE_CONTROLLER. Fixes bug 33124; bugfix on 0.0.5.
Patch by Neel Chauhan.
o Minor bugfixes (logging):
- Remove a debug logging statement that uselessly spammed the logs.
Fixes bug 40135; bugfix on 0.3.5.0-alpha.
- When logging a rate-limited message about how many messages have
been suppressed in the last N seconds, give an accurate value for
N, rounded up to the nearest minute. Previously we would report
the size of the rate-limiting interval, regardless of when the
messages started to occur. Fixes bug 19431; bugfix
on 0.2.2.16-alpha.
o Minor bugfixes (relay configuration, crash):
- Avoid a fatal assert() when failing to create a listener
connection for an address that was in use. Fixes bug 40073; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (rust, protocol versions):
- Declare support for the onion service introduction point denial of
service extensions when building with Rust. Fixes bug 34248;
bugfix on 0.4.2.1-alpha.
- Make Rust protocol version support checks consistent with the
undocumented error behavior of the corresponding C code. Fixes bug
34251; bugfix on 0.3.3.5-rc.
o Minor bugfixes (self-testing):
- When receiving an incoming circuit, only accept it as evidence
that we are reachable if the declared address of its channel is
the same address we think that we have. Otherwise, it could be
evidence that we're reachable on some other address. Fixes bug
20165; bugfix on 0.1.0.1-rc.
o Minor bugfixes (spec conformance):
- Use the correct key type when generating signing->link
certificates. Fixes bug 40124; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (subprotocol versions):
- Consistently reject extra commas, instead of only rejecting
leading commas. Fixes bug 27194; bugfix on 0.2.9.4-alpha.
- In summarize_protover_flags(), treat empty strings the same as
NULL. This prevents protocols_known from being set. Previously, we
treated empty strings as normal strings, which led to
protocols_known being set. Fixes bug 34232; bugfix on
0.3.3.2-alpha. Patch by Neel Chauhan.
o Minor bugfixes (v2 onion services):
- For HSFETCH commands on v2 onion services addresses, check the
length of bytes decoded, not the base32 length. Fixes bug 34400;
bugfix on 0.4.1.1-alpha. Patch by Neel Chauhan.
o Code simplification and refactoring:
- Add and use a set of functions to perform down-casts on constant
connection and channel pointers. Closes ticket 40046.
- Refactor our code that logs descriptions of connections, channels,
and the peers on them, to use a single call path. This change
enables us to refactor the data types that they use, and eliminates
many confusing usages of those types. Closes ticket 40041.
- Refactor some common node selection code into a single function.
Closes ticket 34200.
- Remove the now-redundant 'outbuf_flushlen' field from our
connection type. It was previously used for an older version of
our rate-limiting logic. Closes ticket 33097.
- Rename "fascist_firewall_*" identifiers to "reachable_addr_*"
instead, for consistency with other code. Closes ticket 18106.
- Rename functions about "advertised" ports which are not in fact
guaranteed to return the ports that have been advertised. Closes
ticket 40055.
- Split implementation of several command line options from
options_init_from_torrc into smaller isolated functions. Patch by
Daniel Pinto. Closes ticket 40102.
- When an extend cell is missing an IPv4 or IPv6 address, fill in
the address from the extend info. This is similar to what was done
in ticket 33633 for ed25519 keys. Closes ticket 33816. Patch by
Neel Chauhan.
o Deprecated features:
- The "non-builtin" argument to the "--dump-config" command is now
deprecated. When it works, it behaves the same as "short", which
you should use instead. Closes ticket 33398.
o Documentation:
- Replace URLs from our old bugtracker so that they refer to the new
bugtracker and wiki. Closes ticket 40101.
o Removed features:
- We no longer ship or build a "tor.service" file for use with
systemd. No distribution included this script unmodified, and we
don't have the expertise ourselves to maintain this in a way that
all the various systemd-based distributions can use. Closes
ticket 30797.
- We no longer ship support for the Android logging API. Modern
versions of Android can use the syslog API instead. Closes
ticket 32181.
- The "optimistic data" feature is now always on; there is no longer
an option to disable it from the torrc file or from the consensus
directory. Closes part of 40139.
- The "usecreatefast" network parameter is now removed; there is no
longer an option for authorities to turn it off. Closes part
of 40139.
o Testing:
- Add unit tests for bandwidth statistics manipulation functions.
Closes ticket 33812. Patch by MrSquanchee.
o Code simplification and refactoring (autoconf):
- Remove autoconf checks for unused funcs and headers. Closes ticket
31699; Patch by @bduszel
o Code simplification and refactoring (maintainer scripts):
- Disable by default the pre-commit hook. Use the environment
variable TOR_EXTRA_PRE_COMMIT_CHECKS in order to run it.
Furthermore, stop running practracker in the pre-commit hook and
make check-local. Closes ticket 40019.
o Code simplification and refactoring (relay address):
- Most of IPv4 representation was using "uint32_t". It has now been
moved to use the internal "tor_addr_t" interface instead. This is
so we can properly integrate IPv6 along IPv4 with common
interfaces. Closes ticket 40043.
o Documentation (manual page):
- Move them from doc/ to doc/man/. Closes ticket 40044.
- Describe the status of the "Sandbox" option more accurately. It is
no longer "experimental", but it _is_ dependent on kernel and libc
versions. Closes ticket 23378.
o Documentation (tracing):
- Document in depth the circuit subsystem trace events in the new
doc/tracing/EventsCircuit.md. Closes ticket 40036.
Changes in version 0.4.4.5 - 2020-09-15
Tor 0.4.4.5 is the first stable release in the 0.4.4.x series. This
series improves our guard selection algorithms, adds v3 onion balance
support, improves the amount of code that can be disabled when running
without relay support, and includes numerous small bugfixes and
enhancements. It also lays the ground for some IPv6 features that
we'll be developing more in the next (0.4.5) series.
Per our support policy, we support each stable release series for nine
months after its first stable release, or three months after the first
stable release of the next series: whichever is longer. This means
that 0.4.4.x will be supported until around June 2021--or later, if
0.4.5.x is later than anticipated.
Note also that support for 0.4.2.x has just ended; support for 0.4.3
will continue until Feb 15, 2021. We still plan to continue supporting
0.3.5.x, our long-term stable series, until Feb 2022.
Below are the changes since 0.4.4.4-rc. For a complete list of changes
since 0.4.3.6, see the ReleaseNotes file.
o Major bugfixes (onion services, DoS):
- Correct handling of parameters for the onion service DoS defense.
Previously, the consensus parameters for the onion service DoS
defenses were overwriting the parameters set by the service
operator using HiddenServiceEnableIntroDoSDefense. Fixes bug
40109; bugfix on 0.4.2.1-alpha.
o Major bugfixes (stats, onion services):
- Fix a bug where we were undercounting the Tor network's total
onion service traffic, by ignoring any traffic originating from
clients. Now we count traffic from both clients and services.
Fixes bug 40117; bugfix on 0.2.6.2-alpha.
o Minor features (control port):
- If a ClientName was specified in ONION_CLIENT_AUTH_ADD for an
onion service, display it when we use ONION_CLIENT_AUTH_VIEW.
Closes ticket 40089. Patch by Neel Chauhan.
o Minor features (denial-of-service memory limiter):
- Allow the user to configure even lower values for the
MaxMemInQueues parameter. Relays now enforce a minimum of 64 MB,
when previously the minimum was 256 MB. On clients, there is no
minimum. Relays and clients will both warn if the value is set so
low that Tor is likely to stop working. Closes ticket 24308.
o Minor features (tests):
- Our "make check" target now runs the unit tests in 8 parallel
chunks. Doing this speeds up hardened CI builds by more than a
factor of two. Closes ticket 40098.
o Minor bugfixes (guard selection algorithm):
- Avoid needless guard-related warning when upgrading from 0.4.3 to
0.4.4. Fixes bug 40105; bugfix on 0.4.4.1-alpha.
o Minor bugfixes (tests):
- Fix the behavior of the rend_cache/clean_v2_descs_as_dir when run
on its own. Previously, it would exit with an error. Fixes bug
40099; bugfix on 0.2.8.1-alpha.
Changes in version 0.4.4.3-alpha - 2020-07-27
Tor 0.4.4.3-alpha fixes several annoyances in previous versions,
including one affecting NSS users, and several affecting the Linux
seccomp2 sandbox.
o Major features (fallback directory list):
- Replace the 148 fallback directories originally included in Tor
0.4.1.4-rc (of which around 105 are still functional) with a list
of 144 fallbacks generated in July 2020. Closes ticket 40061.
o Major bugfixes (NSS):
- When running with NSS enabled, make sure that NSS knows to expect
nonblocking sockets. Previously, we set our TCP sockets as
nonblocking, but did not tell NSS, which in turn could lead to
unexpected blocking behavior. Fixes bug 40035; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (linux seccomp2 sandbox):
- Fix a regression on sandboxing rules for the openat() syscall. The
fix for bug 25440 fixed the problem on systems with glibc >= 2.27
but broke with versions of glibc. We now choose a rule based on
the glibc version. Patch from Daniel Pinto. Fixes bug 27315;
bugfix on 0.3.5.11.
- Makes the seccomp sandbox allow the correct syscall for opendir
according to the running glibc version. This fixes crashes when
reloading torrc with sandbox enabled when running on glibc 2.15 to
2.21 and 2.26. Patch from Daniel Pinto. Fixes bug 40020; bugfix
on 0.3.5.11.
o Minor bugfixes (relay, usability):
- Adjust the rules for when to warn about having too many
connections to other relays. Previously we'd tolerate up to 1.5
connections per relay on average. Now we tolerate more connections
for directory authorities, and raise the number of total
connections we need to see before we warn. Fixes bug 33880; bugfix
on 0.3.1.1-alpha.
o Documentation:
- Replace most http:// URLs in our code and documentation with
https:// URLs. (We have left unchanged the code in src/ext/, and
the text in LICENSE.) Closes ticket 31812. Patch from Jeremy Rand.
o Removed features:
- Our "check-local" test target no longer tries to use the
Coccinelle semantic patching tool parse all the C files. While it
is a good idea to try to make sure Coccinelle works on our C
before we run a Coccinelle patch, doing so on every test run has
proven to be disruptive. You can still run this tool manually with
"make check-cocci". Closes ticket 40030.
Changes in version 0.3.5.11 - 2020-07-09
Tor 0.3.5.11 backports fixes from later tor releases, including several
usability, portability, and reliability fixes.
This release also fixes TROVE-2020-001, a medium-severity denial of
service vulnerability affecting all versions of Tor when compiled with
the NSS encryption library. (This is not the default configuration.)
Using this vulnerability, an attacker could cause an affected Tor
instance to crash remotely. This issue is also tracked as CVE-2020-
15572. Anybody running a version of Tor built with the NSS library
should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
or later.
o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
- Fix a crash due to an out-of-bound memory access when Tor is
compiled with NSS support. Fixes bug 33119; bugfix on
0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
and CVE-2020-15572.
o Major bugfixes (DoS defenses, bridges, pluggable transport, backport from 0.4.3.4-rc):
- Fix a bug that was preventing DoS defenses from running on bridges
with a pluggable transport. Previously, the DoS subsystem was not
given the transport name of the client connection, thus failed to
find the GeoIP cache entry for that client address. Fixes bug
33491; bugfix on 0.3.3.2-alpha.
o Minor features (testing, backport from 0.4.3.4-rc):
- The unit tests now support a "TOR_SKIP_TESTCASES" environment
variable to specify a list of space-separated test cases that
should not be executed. We will use this to disable certain tests
that are failing on Appveyor because of mismatched OpenSSL
libraries. Part of ticket 33643.
o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
- Use the correct 64-bit printf format when compiling with MINGW on
Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
o Minor bugfix (relay, configuration, backport from 0.4.3.3-alpha):
- Warn if the ContactInfo field is not set, and tell the relay
operator that not having a ContactInfo field set might cause their
relay to get rejected in the future. Fixes bug 33361; bugfix
on 0.1.1.10-alpha.
o Minor bugfixes (client performance, backport from 0.4.4.1-alpha):
- Resume use of preemptively-built circuits when UseEntryGuards is set
to 0. We accidentally disabled this feature with that config
setting, leading to slower load times. Fixes bug 34303; bugfix
on 0.3.3.2-alpha.
o Minor bugfixes (compiler compatibility, backport from 0.4.3.5):
- Avoid compiler warnings from Clang 10 related to the use of GCC-
style "/* falls through */" comments. Both Clang and GCC allow
__attribute__((fallthrough)) instead, so that's what we're using
now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
- Fix a compiler warning on platforms with 32-bit time_t values.
Fixes bug 40028; bugfix on 0.3.2.8-rc.
o Minor bugfixes (embedded Tor, backport from 0.4.3.1-alpha):
- When starting Tor any time after the first time in a process,
register the thread in which it is running as the main thread.
Previously, we only did this on Windows, which could lead to bugs
like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (key portability, backport from 0.4.3.4-rc):
- When reading PEM-encoded key data, tolerate CRLF line-endings even
if we are not running on Windows. Previously, non-Windows hosts
would reject these line-endings in certain positions, making
certain key files hard to move from one host to another. Fixes bug
33032; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
- Downgrade a noisy log message that could occur naturally when
receiving an extrainfo document that we no longer want. Fixes bug
16016; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (onion service v3, client, backport from 0.4.3.3-alpha):
- Remove a BUG() warning that would cause a stack trace if an onion
service descriptor was freed while we were waiting for a
rendezvous circuit to complete. Fixes bug 28992; bugfix
on 0.3.2.1-alpha.
o Testing (CI, backport from 0.4.3.4-rc):
- In our Appveyor Windows CI, copy required DLLs to test and app
directories, before running tor's tests. This ensures that tor.exe
and test*.exe use the correct version of each DLL. This fix is not
required, but we hope it will avoid DLL search issues in future.
Fixes bug 33673; bugfix on 0.3.4.2-alpha.
- On Appveyor, skip the crypto/openssl_version test, which is
failing because of a mismatched library installation. Fix
for 33643.
Changes in version 0.4.2.8 - 2020-07-09
Tor 0.4.2.8 backports various fixes from later releases, including
several that affect usability and portability.
This release also fixes TROVE-2020-001, a medium-severity denial of
service vulnerability affecting all versions of Tor when compiled with
the NSS encryption library. (This is not the default configuration.)
Using this vulnerability, an attacker could cause an affected Tor
instance to crash remotely. This issue is also tracked as CVE-2020-
15572. Anybody running a version of Tor built with the NSS library
should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
or later.
o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
- Fix a crash due to an out-of-bound memory access when Tor is
compiled with NSS support. Fixes bug 33119; bugfix on
0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
and CVE-2020-15572.
o Major bugfixes (DoS defenses, bridges, pluggable transport, backport from 0.4.3.4-rc):
- Fix a bug that was preventing DoS defenses from running on bridges
with a pluggable transport. Previously, the DoS subsystem was not
given the transport name of the client connection, thus failed to
find the GeoIP cache entry for that client address. Fixes bug
33491; bugfix on 0.3.3.2-alpha.
o Minor feature (sendme, flow control, backport form 0.4.3.4-rc):
- Default to sending SENDME version 1 cells. (Clients are already
sending these, because of a consensus parameter telling them to do
so: this change only affects what clients would do if the
consensus didn't contain a recommendation.) Closes ticket 33623.
o Minor features (diagnostic, backport from 0.4.3.3-alpha):
- Improve assertions and add some memory-poisoning code to try to
track down possible causes of a rare crash (32564) in the EWMA
code. Closes ticket 33290.
o Minor features (testing, backport from 0.4.3.4-rc):
- The unit tests now support a "TOR_SKIP_TESTCASES" environment
variable to specify a list of space-separated test cases that
should not be executed. We will use this to disable certain tests
that are failing on Appveyor because of mismatched OpenSSL
libraries. Part of ticket 33643.
o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
- Use the correct 64-bit printf format when compiling with MINGW on
Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
o Minor bugfix (relay, configuration, backport from 0.4.3.3-alpha):
- Warn if the ContactInfo field is not set, and tell the relay
operator that not having a ContactInfo field set might cause their
relay to get rejected in the future. Fixes bug 33361; bugfix
on 0.1.1.10-alpha.
o Minor bugfixes (client performance, backport from 0.4.4.1-alpha):
- Resume use of preemptively-built circuits when UseEntryGuards is set
to 0. We accidentally disabled this feature with that config
setting, leading to slower load times. Fixes bug 34303; bugfix
on 0.3.3.2-alpha.
o Minor bugfixes (compiler compatibility, backport from 0.4.3.5):
- Avoid compiler warnings from Clang 10 related to the use of GCC-
style "/* falls through */" comments. Both Clang and GCC allow
__attribute__((fallthrough)) instead, so that's what we're using
now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
- Fix compilation warnings with GCC 10.0.1. Fixes bug 34077; bugfix
on 0.4.0.3-alpha.
o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
- Fix a compiler warning on platforms with 32-bit time_t values.
Fixes bug 40028; bugfix on 0.3.2.8-rc.
o Minor bugfixes (controller protocol, backport from 0.4.3.2-alpha):
- When receiving "ACTIVE" or "DORMANT" signals on the control port,
report them as SIGNAL events. Previously we would log a bug
warning. Fixes bug 33104; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (embedded Tor, backport from 0.4.3.1-alpha):
- When starting Tor any time after the first time in a process,
register the thread in which it is running as the main thread.
Previously, we only did this on Windows, which could lead to bugs
like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (key portability, backport from 0.4.3.4-rc):
- When reading PEM-encoded key data, tolerate CRLF line-endings even
if we are not running on Windows. Previously, non-Windows hosts
would reject these line-endings in certain positions, making
certain key files hard to move from one host to another. Fixes bug
33032; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (logging, backport from 0.4.3.2-rc):
- When logging a bug, do not say "Future instances of this warning
will be silenced" unless we are actually going to silence them.
Previously we would say this whenever a BUG() check failed in the
code. Fixes bug 33095; bugfix on 0.4.1.1-alpha.
o Minor bugfixes (logging, backport from 0.4.3.4-rc):
- Flush stderr, stdout, and file logs during shutdown, if supported
by the OS. This change helps make sure that any final logs are
recorded. Fixes bug 33087; bugfix on 0.4.1.6.
o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
- Downgrade a noisy log message that could occur naturally when
receiving an extrainfo document that we no longer want. Fixes bug
16016; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (onion service v3, client, backport from 0.4.3.3-alpha):
- Remove a BUG() warning that would cause a stack trace if an onion
service descriptor was freed while we were waiting for a
rendezvous circuit to complete. Fixes bug 28992; bugfix
on 0.3.2.1-alpha.
o Testing (CI, backport from 0.4.3.4-rc):
- In our Appveyor Windows CI, copy required DLLs to test and app
directories, before running tor's tests. This ensures that tor.exe
and test*.exe use the correct version of each DLL. This fix is not
required, but we hope it will avoid DLL search issues in future.
Fixes bug 33673; bugfix on 0.3.4.2-alpha.
- On Appveyor, skip the crypto/openssl_version test, which is
failing because of a mismatched library installation. Fix
for 33643.
Changes in version 0.4.3.6 - 2020-07-09
Tor 0.4.3.6 backports several bugfixes from later releases, including
some affecting usability.
This release also fixes TROVE-2020-001, a medium-severity denial of
service vulnerability affecting all versions of Tor when compiled with
the NSS encryption library. (This is not the default configuration.)
Using this vulnerability, an attacker could cause an affected Tor
instance to crash remotely. This issue is also tracked as CVE-2020-
15572. Anybody running a version of Tor built with the NSS library
should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
or later.
o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
- Fix a crash due to an out-of-bound memory access when Tor is
compiled with NSS support. Fixes bug 33119; bugfix on
0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
and CVE-2020-15572.
o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
- Use the correct 64-bit printf format when compiling with MINGW on
Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
o Minor bugfixes (client performance, backport from 0.4.4.1-alpha):
- Resume use of preemptively-built circuits when UseEntryGuards is set
to 0. We accidentally disabled this feature with that config
setting, leading to slower load times. Fixes bug 34303; bugfix
on 0.3.3.2-alpha.
o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
- Fix a compiler warning on platforms with 32-bit time_t values.
Fixes bug 40028; bugfix on 0.3.2.8-rc.
o Minor bugfixes (linux seccomp sandbox, nss, backport from 0.4.4.1-alpha):
- Fix a startup crash when tor is compiled with --enable-nss and
sandbox support is enabled. Fixes bug 34130; bugfix on
0.3.5.1-alpha. Patch by Daniel Pinto.
o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
- Downgrade a noisy log message that could occur naturally when
receiving an extrainfo document that we no longer want. Fixes bug
16016; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (manual page, backport from 0.4.4.1-alpha):
- Update the man page to reflect that MinUptimeHidServDirectoryV2
defaults to 96 hours. Fixes bug 34299; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (onion service v3, backport from 0.4.4.1-alpha):
- Prevent an assert() that would occur when cleaning the client
descriptor cache, and attempting to close circuits for a non-
decrypted descriptor (lacking client authorization). Fixes bug
33458; bugfix on 0.4.2.1-alpha.
o Minor bugfixes (portability, backport from 0.4.4.1-alpha):
- Fix a portability error in the configure script, where we were
using "==" instead of "=". Fixes bug 34233; bugfix on 0.4.3.5.
o Minor bugfixes (relays, backport from 0.4.4.1-alpha):
- Stop advertising incorrect IPv6 ORPorts in relay and bridge
descriptors, when the IPv6 port was configured as "auto". Fixes
bug 32588; bugfix on 0.2.3.9-alpha.
o Documentation (backport from 0.4.4.1-alpha):
- Fix several doxygen warnings related to imbalanced groups. Closes
ticket 34255.
Changes in version 0.4.4.2-alpha - 2020-07-09
This is the second alpha release in the 0.4.4.x series. It fixes a few
bugs in the previous release, and solves a few usability,
compatibility, and portability issues.
This release also fixes TROVE-2020-001, a medium-severity denial of
service vulnerability affecting all versions of Tor when compiled with
the NSS encryption library. (This is not the default configuration.)
Using this vulnerability, an attacker could cause an affected Tor
instance to crash remotely. This issue is also tracked as CVE-2020-
15572. Anybody running a version of Tor built with the NSS library
should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
or later.
o Major bugfixes (NSS, security):
- Fix a crash due to an out-of-bound memory access when Tor is
compiled with NSS support. Fixes bug 33119; bugfix on
0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
and CVE-2020-15572.
o Minor features (bootstrap reporting):
- Report more detailed reasons for bootstrap failure when the
failure happens due to a TLS error. Previously we would just call
these errors "MISC" when they happened during read, and "DONE"
when they happened during any other TLS operation. Closes
ticket 32622.
o Minor features (directory authority):
- Authorities now recommend the protocol versions that are supported
by Tor 0.3.5 and later. (Earlier versions of Tor have been
deprecated since January of this year.) This recommendation will
cause older clients and relays to give a warning on startup, or
when they download a consensus directory. Closes ticket 32696.
o Minor features (entry guards):
- Reinstate support for GUARD NEW/UP/DOWN control port events.
Closes ticket 40001.
o Minor features (linux seccomp2 sandbox, portability):
- Allow Tor to build on platforms where it doesn't know how to
report which syscall caused the linux seccomp2 sandbox to fail.
This change should make the sandbox code more portable to less
common Linux architectures. Closes ticket 34382.
- Permit the unlinkat() syscall, which some Libc implementations use
to implement unlink(). Closes ticket 33346.
o Minor bugfix (CI, Windows):
- Use the correct 64-bit printf format when compiling with MINGW on
Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
o Minor bugfix (onion service v3 client):
- Remove a BUG() warning that could occur naturally. Fixes bug
34087; bugfix on 0.3.2.1-alpha.
o Minor bugfix (SOCKS, onion service client):
- Detect v3 onion service addresses of the wrong length when
returning the F6 ExtendedErrors code. Fixes bug 33873; bugfix
on 0.4.3.1-alpha.
o Minor bugfixes (compiler warnings):
- Fix a compiler warning on platforms with 32-bit time_t values.
Fixes bug 40028; bugfix on 0.3.2.8-rc.
o Minor bugfixes (control port, onion service):
- Consistently use 'address' in "Invalid v3 address" response to
ONION_CLIENT_AUTH commands. Previously, we would sometimes say
'addr'. Fixes bug 40005; bugfix on 0.4.3.1-alpha.
o Minor bugfixes (logging):
- Downgrade a noisy log message that could occur naturally when
receiving an extrainfo document that we no longer want. Fixes bug
16016; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (onion services v3):
- Avoid a non-fatal assertion failure in certain edge-cases when
opening an intro circuit as a client. Fixes bug 34084; bugfix
on 0.3.2.1-alpha.
o Deprecated features (onion service v2):
- Add a deprecation warning for version 2 onion services. Closes
ticket 40003.
o Removed features (IPv6, revert):
- Revert the change in the default value of ClientPreferIPv6OrPort:
it breaks the torsocks use case. The SOCKS resolve command has no
mechanism to ask for a specific address family (v4 or v6), and so
prioritizing IPv6 when an IPv4 address is requested on the SOCKS
interface resulted in a failure. Tor Browser explicitly sets
PreferIPv6, so this should not affect the majority of our users.
Closes ticket 33796; bugfix on 0.4.4.1-alpha.
Changes in version 0.4.4.1-alpha - 2020-06-16
This is the first alpha release in the 0.4.4.x series. It improves
our guard selection algorithms, improves the amount of code that
can be disabled when running without relay support, and includes numerous
small bugfixes and enhancements. It also lays the ground for some IPv6
features that we'll be developing more in the next (0.4.5) series.
Here are the changes since 0.4.3.5.
o Major features (Proposal 310, performance + security):
- Implements Proposal 310, "Bandaid on guard selection". Proposal
310 solves load-balancing issues with older versions of the guard
selection algorithm, and improves its security. Under this new
algorithm, a newly selected guard never becomes Primary unless all
previously sampled guards are unreachable. Implements
recommendation from 32088. (Proposal 310 is linked to the CLAPS
project researching optimal client location-aware path selections.
This project is a collaboration between the UCLouvain Crypto Group,
the U.S. Naval Research Laboratory, and Princeton University.)
o Major features (IPv6, relay):
- Consider IPv6-only EXTEND2 cells valid on relays. Log a protocol
warning if the IPv4 or IPv6 address is an internal address, and
internal addresses are not allowed. But continue to use the other
address, if it is valid. Closes ticket 33817.
- If a relay can extend over IPv4 and IPv6, and both addresses are
provided, it chooses between them uniformly at random. Closes
ticket 33817.
- Re-use existing IPv6 connections for circuit extends. Closes
ticket 33817.
- Relays may extend circuits over IPv6, if the relay has an IPv6
ORPort, and the client supplies the other relay's IPv6 ORPort in
the EXTEND2 cell. IPv6 extends will be used by the relay IPv6
ORPort self-tests in 33222. Closes ticket 33817.
o Major features (v3 onion services):
- Allow v3 onion services to act as OnionBalance backend instances,
by using the HiddenServiceOnionBalanceInstance torrc option.
Closes ticket 32709.
o Minor feature (developer tools):
- Add a script to help check the alphabetical ordering of option
names in the manual page. Closes ticket 33339.
o Minor feature (onion service client, SOCKS5):
- Add 3 new SocksPort ExtendedErrors (F2, F3, F7) that reports back
new type of onion service connection failures. The semantics of
these error codes are documented in proposal 309. Closes
ticket 32542.
o Minor feature (onion service v3):
- If a service cannot upload its descriptor(s), log why at INFO
level. Closes ticket 33400; bugfix on 0.3.2.1-alpha.
o Minor feature (python scripts):
- Stop assuming that /usr/bin/python exists. Instead of using a
hardcoded path in scripts that still use Python 2, use
/usr/bin/env, similarly to the scripts that use Python 3. Fixes
bug 33192; bugfix on 0.4.2.
o Minor features (client-only compilation):
- Disable more code related to the ext_orport protocol when
compiling without support for relay mode. Closes ticket 33368.
- Disable more of our self-testing code when support for relay mode
is disabled. Closes ticket 33370.
o Minor features (code safety):
- Check for failures of tor_inet_ntop() and tor_inet_ntoa()
functions in DNS and IP address processing code, and adjust
codepaths to make them less likely to crash entire Tor instances.
Resolves issue 33788.
o Minor features (compilation size):
- Most server-side DNS code is now disabled when building without
support for relay mode. Closes ticket 33366.
o Minor features (continuous integration):
- Run unit-test and integration test (Stem, Chutney) jobs with
ALL_BUGS_ARE_FATAL macro being enabled on Travis and Appveyor.
Resolves ticket 32143.
o Minor features (control port):
- Return a descriptive error message from the 'GETINFO status/fresh-
relay-descs' command on the control port. Previously, we returned
a generic error of "Error generating descriptor". Closes ticket
32873. Patch by Neel Chauhan.
o Minor features (developer tooling):
- Refrain from listing all .a files that are generated by the Tor
build in .gitignore. Add a single wildcard *.a entry that covers
all of them for present and future. Closes ticket 33642.
- Add a script ("git-install-tools.sh") to install git hooks and
helper scripts. Closes ticket 33451.
o Minor features (directory authority, shared random):
- Refactor more authority-only parts of the shared-random scheduling
code to reside in the dirauth module, and to be disabled when
compiling with --disable-module-dirauth. Closes ticket 33436.
o Minor features (directory):
- Remember the number of bytes we have downloaded for each directory
purpose while bootstrapping, and while fully bootstrapped. Log
this information as part of the heartbeat message. Closes
ticket 32720.
o Minor features (IPv6 support):
- Adds IPv6 support to tor_addr_is_valid(). Adds tests for the above
changes and tor_addr_is_null(). Closes ticket 33679. Patch
by MrSquanchee.
- Allow clients and relays to send dual-stack and IPv6-only EXTEND2
cells. Parse dual-stack and IPv6-only EXTEND2 cells on relays.
Closes ticket 33901.
o Minor features (logging):
- When trying to find our own address, add debug-level logging to
report the sources of candidate addresses. Closes ticket 32888.
o Minor features (testing, architecture):
- Our test scripts now double-check that subsystem initialization
order is consistent with the inter-module dependencies established
by our .may_include files. Implements ticket 31634.
- Initialize all subsystems at the beginning of our unit test
harness, to avoid crashes due to uninitialized subsystems. Follow-
up from ticket 33316.
o Minor features (v3 onion services):
- Add v3 onion service status to the dumpstats() call which is
triggered by a SIGUSR1 signal. Previously, we only did v2 onion
services. Closes ticket 24844. Patch by Neel Chauhan.
o Minor features (windows):
- Add support for console control signals like Ctrl+C in Windows.
Closes ticket 34211. Patch from Damon Harris (TheDcoder).
o Minor bugfix (onion service v3):
- Prevent an assert() that would occur when cleaning the client
descriptor cache, and attempting to close circuits for a non-
decrypted descriptor (lacking client authorization). Fixes bug
33458; bugfix on 0.4.2.1-alpha.
o Minor bugfix (refactoring):
- Lift circuit_build_times_disabled() out of the
circuit_expire_building() loop, to save CPU time when there are
many circuits open. Fixes bug 33977; bugfix on 0.3.5.9.
o Minor bugfixes (client performance):
- Resume use of preemptively-built circuits when UseEntryGuards is set
to 0. We accidentally disabled this feature with that config
setting, leading to slower load times. Fixes bug 34303; bugfix
on 0.3.3.2-alpha.
o Minor bugfixes (directory authorities):
- Directory authorities now reject votes that arrive too late. In
particular, once an authority has started fetching missing votes,
it no longer accepts new votes posted by other authorities. This
change helps prevent a consensus split, where only some authorities
have the late vote. Fixes bug 4631; bugfix on 0.2.0.5-alpha.
o Minor bugfixes (git scripts):
- Stop executing the checked-out pre-commit hook from the pre-push
hook. Instead, execute the copy in the user's git directory. Fixes
bug 33284; bugfix on 0.4.1.1-alpha.
o Minor bugfixes (initialization):
- Initialize the subsystems in our code in an order more closely
corresponding to their dependencies, so that every system is
initialized before the ones that (theoretically) depend on it.
Fixes bug 33316; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (IPv4, relay):
- Check for invalid zero IPv4 addresses and ports when sending and
receiving extend cells. Fixes bug 33900; bugfix on 0.2.4.8-alpha.
o Minor bugfixes (IPv6, relay):
- Consider IPv6 addresses when checking if a connection is
canonical. In 17604, relays assumed that a remote relay could
consider an IPv6 connection canonical, but did not set the
canonical flag on their side of the connection. Fixes bug 33899;
bugfix on 0.3.1.1-alpha.
- Log IPv6 addresses on connections where this relay is the
responder. Previously, responding relays would replace the remote
IPv6 address with the IPv4 address from the consensus. Fixes bug
33899; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (linux seccomp sandbox nss):
- Fix a startup crash when tor is compiled with --enable-nss and
sandbox support is enabled. Fixes bug 34130; bugfix on
0.3.5.1-alpha. Patch by Daniel Pinto.
o Minor bugfixes (logging, testing):
- Make all of tor's assertion macros support the ALL_BUGS_ARE_FATAL
and DISABLE_ASSERTS_IN_UNIT_TESTS debugging modes. (IF_BUG_ONCE()
used to log a non-fatal warning, regardless of the debugging
mode.) Fixes bug 33917; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (logs):
- Remove surprising empty line in the INFO-level log about circuit
build timeout. Fixes bug 33531; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (mainloop):
- Better guard against growing a buffer past its maximum 2GB in
size. Fixes bug 33131; bugfix on 0.3.0.4-rc.
o Minor bugfixes (manual page):
- Update the man page to reflect that MinUptimeHidServDirectoryV2
defaults to 96 hours. Fixes bug 34299; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (onion service v3, client):
- Remove a BUG() that was causing a stacktrace when a descriptor
changed at an unexpected time. Fixes bug 28992; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (onion service, logging):
- Fix a typo in a log message PublishHidServDescriptors is set to 0.
Fixes bug 33779; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (portability):
- Fix a portability error in the configure script, where we were
using "==" instead of "=". Fixes bug 34233; bugfix on 0.4.3.5.
o Minor bugfixes (protocol versions):
- Sort tor's supported protocol version lists, as recommended by the
tor directory specification. Fixes bug 33285; bugfix
on 0.4.0.1-alpha.
o Minor bugfixes (relays):
- Stop advertising incorrect IPv6 ORPorts in relay and bridge
descriptors, when the IPv6 port was configured as "auto". Fixes
bug 32588; bugfix on 0.2.3.9-alpha.
o Code simplification and refactoring:
- Define and use a new constant TOR_ADDRPORT_BUF_LEN which is like
TOR_ADDR_BUF_LEN but includes enough space for an IP address,
brackets, separating colon, and port number. Closes ticket 33956.
Patch by Neel Chauhan.
- Merge the orconn and ocirc events into the "core" subsystem, which
manages or connections and origin circuits. Previously they were
isolated in subsystems of their own.
- Move LOG_PROTOCOL_WARN to app/config. Resolves a dependency
inversion. Closes ticket 33633.
- Move the circuit extend code to the relay module. Split the
circuit extend function into smaller functions. Closes
ticket 33633.
- Rewrite port_parse_config() to use the default port flags from
port_cfg_new(). Closes ticket 32994. Patch by MrSquanchee.
- Updated comments in 'scheduler.c' to reflect old code changes, and
simplified the scheduler channel state change code. Closes
ticket 33349.
o Documentation:
- Document the limitations of using %include on config files with
seccomp sandbox enabled. Fixes documentation bug 34133; bugfix on
0.3.1.1-alpha. Patch by Daniel Pinto.
- Fix several doxygen warnings related to imbalanced groups. Closes
ticket 34255.
o Removed features:
- Remove the ClientAutoIPv6ORPort option. This option attempted to
randomly choose between IPv4 and IPv6 for client connections, and
wasn't a true implementation of Happy Eyeballs. Often, this option
failed on IPv4-only or IPv6-only connections. Closes ticket 32905.
Patch by Neel Chauhan.
- Stop shipping contrib/dist/rc.subr file, as it is not being used
on FreeBSD anymore. Closes issue 31576.
o Testing:
- Add a basic IPv6 test to "make test-network". This test only runs
when the local machine has an IPv6 stack. Closes ticket 33300.
- Add test-network-ipv4 and test-network-ipv6 jobs to the Makefile.
These jobs run the IPv4-only and dual-stack chutney flavours from
test-network-all. Closes ticket 33280.
- Remove a redundant distcheck job. Closes ticket 33194.
- Run the test-network-ipv6 Makefile target in the Travis CI IPv6
chutney job. This job runs on macOS, so it's a bit slow. Closes
ticket 33303.
- Sort the Travis jobs in order of speed. Putting the slowest jobs
first takes full advantage of Travis job concurrency. Closes
ticket 33194.
- Stop allowing the Chutney IPv6 Travis job to fail. This job was
previously configured to fast_finish (which requires
allow_failure), to speed up the build. Closes ticket 33195.
- Test v3 onion services to tor's mixed IPv4 chutney network. And
add a mixed IPv6 chutney network. These networks are used in the
test-network-all, test-network-ipv4, and test-network-ipv6 make
targets. Closes ticket 33334.
- Use the "bridges+hs-v23" chutney network flavour in "make test-
network". This test requires a recent version of chutney (mid-
February 2020). Closes ticket 28208.
- When a Travis chutney job fails, use chutney's new "diagnostics.sh"
tool to produce detailed diagnostic output. Closes ticket 32792.
o Code simplification and refactoring (onion service):
- Refactor configuration parsing to use the new config subsystem
code. Closes ticket 33014.
o Code simplification and refactoring (relay address):
- Move a series of functions related to address resolving into their
own files. Closes ticket 33789.
o Documentation (manual page):
- Add cross reference links and a table of contents to the HTML tor
manual page. Closes ticket 33369. Work by Swati Thacker as part of
Google Season of Docs.
- Alphabetize the Denial of Service Mitigation Options, Directory
Authority Server Options, Hidden Service Options, and Testing
Network Options sections of the tor(1) manual page. Closes ticket
33275. Work by Swati Thacker as part of Google Season of Docs.
- Refrain from mentioning nicknames in manpage section for MyFamily
torrc option. Resolves issue 33417.
- Updated the options set by TestingTorNetwork in the manual page.
Closes ticket 33778.
Changes in version 0.4.3.5 - 2020-05-15
Tor 0.4.3.5 is the first stable release in the 0.4.3.x series. This
series adds support for building without relay code enabled, and
implements functionality needed for OnionBalance with v3 onion
services. It includes significant refactoring of our configuration and
controller functionality, and fixes numerous smaller bugs and
performance issues.
Per our support policy, we support each stable release series for nine
months after its first stable release, or three months after the first
stable release of the next series: whichever is longer. This means
that 0.4.3.x will be supported until around February 2021--later, if
0.4.4.x is later than anticipated.
Note also that support for 0.4.1.x is about to end on May 20 of this
year; 0.4.2.x will be supported until September 15. We still plan to
continue supporting 0.3.5.x, our long-term stable series, until
Feb 2022.
Below are the changes since 0.4.3.4-rc. For a complete list of changes
since 0.4.2.6, see the ReleaseNotes file.
o Minor bugfixes (compiler compatibility):
- Avoid compiler warnings from Clang 10 related to the use of GCC-
style "/* falls through */" comments. Both Clang and GCC allow
__attribute__((fallthrough)) instead, so that's what we're using
now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
- Fix compilation warnings with GCC 10.0.1. Fixes bug 34077; bugfix
on 0.4.0.3-alpha.
o Minor bugfixes (logging):
- Stop truncating IPv6 addresses and ports in channel and connection
logs. Fixes bug 33918; bugfix on 0.2.4.4-alpha.
- Fix a logic error in a log message about whether an address was
invalid. Previously, the code would never report that onion
addresses were onion addresses. Fixes bug 34131; bugfix
on 0.4.3.1-alpha.
Changes in version 0.4.3.4-rc - 2020-04-13
Tor 0.4.3.4-rc is the first release candidate in its series. It fixes
several bugs from earlier versions, including one affecting DoS
defenses on bridges using pluggable transports.
o Major bugfixes (DoS defenses, bridges, pluggable transport):
- Fix a bug that was preventing DoS defenses from running on bridges
with a pluggable transport. Previously, the DoS subsystem was not
given the transport name of the client connection, thus failed to
find the GeoIP cache entry for that client address. Fixes bug
33491; bugfix on 0.3.3.2-alpha.
o Minor feature (sendme, flow control):
- Default to sending SENDME version 1 cells. (Clients are already
sending these, because of a consensus parameter telling them to do
so: this change only affects what clients would do if the
consensus didn't contain a recommendation.) Closes ticket 33623.
o Minor features (testing):
- The unit tests now support a "TOR_SKIP_TESTCASES" environment
variable to specify a list of space-separated test cases that
should not be executed. We will use this to disable certain tests
that are failing on Appveyor because of mismatched OpenSSL
libraries. Part of ticket 33643.
o Minor bugfixes (--disable-module-relay):
- Fix an assertion failure when Tor is built without the relay
module, and then invoked with the "User" option. Fixes bug 33668;
bugfix on 0.4.3.1-alpha.
o Minor bugfixes (--disable-module-relay,--disable-module-dirauth):
- Set some output arguments in the relay and dirauth module stubs,
to guard against future stub argument handling bugs like 33668.
Fixes bug 33674; bugfix on 0.4.3.1-alpha.
o Minor bugfixes (build system):
- Correctly output the enabled module in the configure summary.
Before that, the list shown was just plain wrong. Fixes bug 33646;
bugfix on 0.4.3.2-alpha.
o Minor bugfixes (client, IPv6):
- Stop forcing all non-SocksPorts to prefer IPv6 exit connections.
Instead, prefer IPv6 connections by default, but allow users to
change their configs using the "NoPreferIPv6" port flag. Fixes bug
33608; bugfix on 0.4.3.1-alpha.
- Revert PreferIPv6 set by default on the SocksPort because it broke
the torsocks use case. Tor doesn't have a way for an application
to request the hostname to be resolved for a specific IP version,
but torsocks requires that. Up until now, IPv4 was used by default
so torsocks is expecting that, and can't handle a possible IPv6
being returned. Fixes bug 33804; bugfix on 0.4.3.1-alpha.
o Minor bugfixes (key portability):
- When reading PEM-encoded key data, tolerate CRLF line-endings even
if we are not running on Windows. Previously, non-Windows hosts
would reject these line-endings in certain positions, making
certain key files hard to move from one host to another. Fixes bug
33032; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (logging):
- Flush stderr, stdout, and file logs during shutdown, if supported
by the OS. This change helps make sure that any final logs are
recorded. Fixes bug 33087; bugfix on 0.4.1.6.
- Stop closing stderr and stdout during shutdown. Closing these file
descriptors can hide sanitiser logs. Fixes bug 33087; bugfix
on 0.4.1.6.
o Minor bugfixes (onion services v3):
- Relax severity of a log message that can appear naturally when
decoding onion service descriptors as a relay. Also add some
diagnostics to debug any future bugs in that area. Fixes bug
31669; bugfix on 0.3.0.1-alpha.
- Block a client-side assertion by disallowing the registration of
an x25519 client auth key that's all zeroes. Fixes bug 33545;
bugfix on 0.4.3.1-alpha. Based on patch from "cypherpunks".
o Code simplification and refactoring:
- Disable our coding standards best practices tracker in our git
hooks. (0.4.3 branches only.) Closes ticket 33678.
o Testing:
- Avoid conflicts between the fake sockets in tor's unit tests, and
real file descriptors. Resolves issues running unit tests with
GitHub Actions, where the process that embeds or launches the
tests has already opened a large number of file descriptors. Fixes
bug 33782; bugfix on 0.2.8.1-alpha. Found and fixed by
Putta Khunchalee.
o Testing (CI):
- In our Appveyor Windows CI, copy required DLLs to test and app
directories, before running tor's tests. This ensures that tor.exe
and test*.exe use the correct version of each DLL. This fix is not
required, but we hope it will avoid DLL search issues in future.
Fixes bug 33673; bugfix on 0.3.4.2-alpha.
- On Appveyor, skip the crypto/openssl_version test, which is
failing because of a mismatched library installation. Fix
for 33643.
Changes in version 0.4.3.3-alpha - 2020-03-18
Tor 0.4.3.3-alpha fixes several bugs in previous releases, including
TROVE-2020-002, a major denial-of-service vulnerability that affected
all released Tor instances since 0.2.1.5-alpha. Using this
vulnerability, an attacker could cause Tor instances to consume a huge
amount of CPU, disrupting their operations for several seconds or
minutes. This attack could be launched by anybody against a relay, or
by a directory cache against any client that had connected to it. The
attacker could launch this attack as much as they wanted, thereby
disrupting service or creating patterns that could aid in traffic
analysis. This issue was found by OSS-Fuzz, and is also tracked
as CVE-2020-10592.
We do not have reason to believe that this attack is currently being
exploited in the wild, but nonetheless we advise everyone to upgrade
as soon as packages are available.
o Major bugfixes (security, denial-of-service):
- Fix a denial-of-service bug that could be used by anyone to
consume a bunch of CPU on any Tor relay or authority, or by
directories to consume a bunch of CPU on clients or hidden
services. Because of the potential for CPU consumption to
introduce observable timing patterns, we are treating this as a
high-severity security issue. Fixes bug 33119; bugfix on
0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
as TROVE-2020-002 and CVE-2020-10592.
o Major bugfixes (circuit padding, memory leak):
- Avoid a remotely triggered memory leak in the case that a circuit
padding machine is somehow negotiated twice on the same circuit.
Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls.
This is also tracked as TROVE-2020-004 and CVE-2020-10593.
o Major bugfixes (directory authority):
- Directory authorities will now send a 503 (not enough bandwidth)
code to clients when under bandwidth pressure. Known relays and
other authorities will always be answered regardless of the
bandwidth situation. Fixes bug 33029; bugfix on 0.1.2.5-alpha.
o Minor features (diagnostic):
- Improve assertions and add some memory-poisoning code to try to
track down possible causes of a rare crash (32564) in the EWMA
code. Closes ticket 33290.
o Minor features (directory authorities):
- Directory authorities now reject descriptors from relays running
Tor versions from the 0.2.9 and 0.4.0 series. The 0.3.5 series is
still allowed. Resolves ticket 32672. Patch by Neel Chauhan.
o Minor features (usability):
- Include more information when failing to parse a configuration
value. This should make it easier to tell what's going wrong when
a configuration file doesn't parse. Closes ticket 33460.
o Minor bugfix (relay, configuration):
- Warn if the ContactInfo field is not set, and tell the relay
operator that not having a ContactInfo field set might cause their
relay to get rejected in the future. Fixes bug 33361; bugfix
on 0.1.1.10-alpha.
o Minor bugfixes (coding best practices checks):
- Allow the "practracker" script to read unicode files when using
Python 2. We made the script use unicode literals in 0.4.3.1-alpha,
but didn't change the codec for opening files. Fixes bug 33374;
bugfix on 0.4.3.1-alpha.
o Minor bugfixes (continuous integration):
- Remove the buggy and unused mirroring job. Fixes bug 33213; bugfix
on 0.3.2.2-alpha.
o Minor bugfixes (onion service v3, client):
- Remove a BUG() warning that would cause a stack trace if an onion
service descriptor was freed while we were waiting for a
rendezvous circuit to complete. Fixes bug 28992; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (onion services v3):
- Fix an assertion failure that could result from a corrupted
ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
bugfix on 0.3.3.1-alpha. This issue is also tracked
as TROVE-2020-003.
o Documentation (manpage):
- Alphabetize the Server and Directory server sections of the tor
manpage. Also split Statistics options into their own section of
the manpage. Closes ticket 33188. Work by Swati Thacker as part of
Google Season of Docs.
- Document the __OwningControllerProcess torrc option and specify
its polling interval. Resolves issue 32971.
o Testing (Travis CI):
- Remove a redundant distcheck job. Closes ticket 33194.
- Sort the Travis jobs in order of speed: putting the slowest jobs
first takes full advantage of Travis job concurrency. Closes
ticket 33194.
- Stop allowing the Chutney IPv6 Travis job to fail. This job was
previously configured to fast_finish (which requires
allow_failure), to speed up the build. Closes ticket 33195.
- When a Travis chutney job fails, use chutney's new "diagnostics.sh"
tool to produce detailed diagnostic output. Closes ticket 32792.
Changes in version 0.4.2.7 - 2020-03-18
This is the third stable release in the 0.4.2.x series. It backports
numerous fixes from later releases, including a fix for TROVE-2020-
002, a major denial-of-service vulnerability that affected all
released Tor instances since 0.2.1.5-alpha. Using this vulnerability,
an attacker could cause Tor instances to consume a huge amount of CPU,
disrupting their operations for several seconds or minutes. This
attack could be launched by anybody against a relay, or by a directory
cache against any client that had connected to it. The attacker could
launch this attack as much as they wanted, thereby disrupting service
or creating patterns that could aid in traffic analysis. This issue
was found by OSS-Fuzz, and is also tracked as CVE-2020-10592.
We do not have reason to believe that this attack is currently being
exploited in the wild, but nonetheless we advise everyone to upgrade
as soon as packages are available.
o Major bugfixes (security, denial-of-service, backport from 0.4.3.3-alpha):
- Fix a denial-of-service bug that could be used by anyone to
consume a bunch of CPU on any Tor relay or authority, or by
directories to consume a bunch of CPU on clients or hidden
services. Because of the potential for CPU consumption to
introduce observable timing patterns, we are treating this as a
high-severity security issue. Fixes bug 33119; bugfix on
0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
as TROVE-2020-002 and CVE-2020-10592.
o Major bugfixes (circuit padding, memory leak, backport from 0.4.3.3-alpha):
- Avoid a remotely triggered memory leak in the case that a circuit
padding machine is somehow negotiated twice on the same circuit.
Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls.
This is also tracked as TROVE-2020-004 and CVE-2020-10593.
o Major bugfixes (directory authority, backport from 0.4.3.3-alpha):
- Directory authorities will now send a 503 (not enough bandwidth)
code to clients when under bandwidth pressure. Known relays and
other authorities will always be answered regardless of the
bandwidth situation. Fixes bug 33029; bugfix on 0.1.2.5-alpha.
o Minor features (continuous integration, backport from 0.4.3.2-alpha):
- Stop allowing failures on the Travis CI stem tests job. It looks
like all the stem hangs we were seeing before are now fixed.
Closes ticket 33075.
o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
- Lowercase the configured value of BridgeDistribution before adding
it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
- If we encounter a bug when flushing a buffer to a TLS connection,
only log the bug once per invocation of the Tor process.
Previously we would log with every occurrence, which could cause
us to run out of disk space. Fixes bug 33093; bugfix
on 0.3.2.2-alpha.
o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
- Fix an assertion failure that could result from a corrupted
ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
bugfix on 0.3.3.1-alpha. This issue is also tracked
as TROVE-2020-003.
o Minor bugfixes (rust, build, backport from 0.4.3.2-alpha):
- Fix a syntax warning given by newer versions of Rust that was
creating problems for our continuous integration. Fixes bug 33212;
bugfix on 0.3.5.1-alpha.
o Testing (Travis CI, backport from 0.4.3.3-alpha):
- Remove a redundant distcheck job. Closes ticket 33194.
- Sort the Travis jobs in order of speed: putting the slowest jobs
first takes full advantage of Travis job concurrency. Closes
ticket 33194.
- Stop allowing the Chutney IPv6 Travis job to fail. This job was
previously configured to fast_finish (which requires
allow_failure), to speed up the build. Closes ticket 33195.
- When a Travis chutney job fails, use chutney's new "diagnostics.sh"
tool to produce detailed diagnostic output. Closes ticket 32792.
Changes in version 0.4.1.9 - 2020-03-18
Tor 0.4.1.9 backports important fixes from later Tor releases,
including a fix for TROVE-2020-002, a major denial-of-service
vulnerability that affected all released Tor instances since
0.2.1.5-alpha. Using this vulnerability, an attacker could cause Tor
instances to consume a huge amount of CPU, disrupting their operations
for several seconds or minutes. This attack could be launched by
anybody against a relay, or by a directory cache against any client
that had connected to it. The attacker could launch this attack as
much as they wanted, thereby disrupting service or creating patterns
that could aid in traffic analysis. This issue was found by OSS-Fuzz,
and is also tracked as CVE-2020-10592.
We do not have reason to believe that this attack is currently being
exploited in the wild, but nonetheless we advise everyone to upgrade
as soon as packages are available.
o Major bugfixes (security, denial-of-service, backport from 0.4.3.3-alpha):
- Fix a denial-of-service bug that could be used by anyone to
consume a bunch of CPU on any Tor relay or authority, or by
directories to consume a bunch of CPU on clients or hidden
services. Because of the potential for CPU consumption to
introduce observable timing patterns, we are treating this as a
high-severity security issue. Fixes bug 33119; bugfix on
0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
as TROVE-2020-002 and CVE-2020-10592.
o Major bugfixes (circuit padding, memory leak, backport from 0.4.3.3-alpha):
- Avoid a remotely triggered memory leak in the case that a circuit
padding machine is somehow negotiated twice on the same circuit.
Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls.
This is also tracked as TROVE-2020-004 and CVE-2020-10593.
o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
- Lowercase the configured value of BridgeDistribution before adding
it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
- If we encounter a bug when flushing a buffer to a TLS connection,
only log the bug once per invocation of the Tor process.
Previously we would log with every occurrence, which could cause
us to run out of disk space. Fixes bug 33093; bugfix
on 0.3.2.2-alpha.
o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
- Fix an assertion failure that could result from a corrupted
ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
bugfix on 0.3.3.1-alpha. This issue is also tracked
as TROVE-2020-003.
o Minor bugfixes (rust, build, backport from 0.4.3.2-alpha):
- Fix a syntax warning given by newer versions of Rust that was
creating problems for our continuous integration. Fixes bug 33212;
bugfix on 0.3.5.1-alpha.
o Testing (Travis CI, backport from 0.4.3.3-alpha):
- Remove a redundant distcheck job. Closes ticket 33194.
- Sort the Travis jobs in order of speed: putting the slowest jobs
first takes full advantage of Travis job concurrency. Closes
ticket 33194.
- Stop allowing the Chutney IPv6 Travis job to fail. This job was
previously configured to fast_finish (which requires
allow_failure), to speed up the build. Closes ticket 33195.
- When a Travis chutney job fails, use chutney's new "diagnostics.sh"
tool to produce detailed diagnostic output. Closes ticket 32792.
Changes in version 0.3.5.10 - 2020-03-18
Tor 0.3.5.10 backports many fixes from later Tor releases, including a
fix for TROVE-2020-002, a major denial-of-service vulnerability that
affected all released Tor instances since 0.2.1.5-alpha. Using this
vulnerability, an attacker could cause Tor instances to consume a huge
amount of CPU, disrupting their operations for several seconds or
minutes. This attack could be launched by anybody against a relay, or
by a directory cache against any client that had connected to it. The
attacker could launch this attack as much as they wanted, thereby
disrupting service or creating patterns that could aid in traffic
analysis. This issue was found by OSS-Fuzz, and is also tracked
as CVE-2020-10592.
We do not have reason to believe that this attack is currently being
exploited in the wild, but nonetheless we advise everyone to upgrade
as soon as packages are available.
o Major bugfixes (security, denial-of-service, backport from 0.4.3.3-alpha):
- Fix a denial-of-service bug that could be used by anyone to
consume a bunch of CPU on any Tor relay or authority, or by
directories to consume a bunch of CPU on clients or hidden
services. Because of the potential for CPU consumption to
introduce observable timing patterns, we are treating this as a
high-severity security issue. Fixes bug 33119; bugfix on
0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
as TROVE-2020-002 and CVE-2020-10592.
o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha):
- Correct how we use libseccomp. Particularly, stop assuming that
rules are applied in a particular order or that more rules are
processed after the first match. Neither is the case! In
libseccomp <2.4.0 this lead to some rules having no effect.
libseccomp 2.4.0 changed how rules are generated, leading to a
different ordering, which in turn led to a fatal crash during
startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
Peter Gerber.
o Minor features (continuous integration, backport from 0.4.3.2-alpha):
- Stop allowing failures on the Travis CI stem tests job. It looks
like all the stem hangs we were seeing before are now fixed.
Closes ticket 33075.
o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
- Lowercase the configured value of BridgeDistribution before adding
it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
o Minor bugfixes (crash, backport from 0.4.2.4-rc):
- When running Tor with an option like --verify-config or
--dump-config that does not start the event loop, avoid crashing
if we try to exit early because of an error. Fixes bug 32407;
bugfix on 0.3.3.1-alpha.
o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
- If we encounter a bug when flushing a buffer to a TLS connection,
only log the bug once per invocation of the Tor process.
Previously we would log with every occurrence, which could cause
us to run out of disk space. Fixes bug 33093; bugfix
on 0.3.2.2-alpha.
o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
- Fix an assertion failure that could result from a corrupted
ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
bugfix on 0.3.3.1-alpha. This issue is also tracked
as TROVE-2020-003.
o Minor bugfixes (rust, build, backport from 0.4.3.2-alpha):
- Fix a syntax warning given by newer versions of Rust that was
creating problems for our continuous integration. Fixes bug 33212;
bugfix on 0.3.5.1-alpha.
o Testing (backport from 0.4.3.1-alpha):
- Re-enable the Travis CI macOS Chutney build, but don't let it
prevent the Travis job from finishing. (The Travis macOS jobs are
slow, so we don't want to have it delay the whole CI process.)
Closes ticket 32629.
- Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
fix the sandbox errors in 32722. Closes ticket 32240.
o Testing (continuous integration, backport from 0.4.3.1-alpha):
- Use zstd in our Travis Linux builds. Closes ticket 32242.
o Testing (Travis CI, backport from 0.4.3.3-alpha):
- Remove a redundant distcheck job. Closes ticket 33194.
- Sort the Travis jobs in order of speed: putting the slowest jobs
first takes full advantage of Travis job concurrency. Closes
ticket 33194.
- Stop allowing the Chutney IPv6 Travis job to fail. This job was
previously configured to fast_finish (which requires
- When a Travis chutney job fails, use chutney's new "diagnostics.sh"
tool to produce detailed diagnostic output. Closes ticket 32792.
Changes in version 0.4.3.2-alpha - 2020-02-10
This is the second stable alpha release in the Tor 0.4.3.x series. It
fixes several bugs present in the previous alpha release. Anybody
running the previous alpha should upgrade, and look for bugs in this
one instead.
o Major bugfixes (onion service client, authorization):
- On a NEWNYM signal, purge entries from the ephemeral client
authorization cache. The permanent ones are kept. Fixes bug 33139;
bugfix on 0.4.3.1-alpha.
o Minor features (best practices tracker):
- Practracker now supports a --regen-overbroad option to regenerate
the exceptions file, but only to revise exceptions to be _less_
tolerant of best-practices violations. Closes ticket 32372.
o Minor features (continuous integration):
- Run Doxygen Makefile target on Travis, so we can learn about
regressions in our internal documentation. Closes ticket 32455.
- Stop allowing failures on the Travis CI stem tests job. It looks
like all the stem hangs we were seeing before are now fixed.
Closes ticket 33075.
o Minor bugfixes (build system):
- Revise configure options that were either missing or incorrect in
the configure summary. Fixes bug 32230; bugfix on 0.4.3.1-alpha.
o Minor bugfixes (controller protocol):
- Fix a memory leak introduced by refactoring of control reply
formatting code. Fixes bug 33039; bugfix on 0.4.3.1-alpha.
- Fix a memory leak in GETINFO responses. Fixes bug 33103; bugfix
on 0.4.3.1-alpha.
- When receiving "ACTIVE" or "DORMANT" signals on the control port,
report them as SIGNAL events. Previously we would log a bug
warning. Fixes bug 33104; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (logging):
- If we encounter a bug when flushing a buffer to a TLS connection,
only log the bug once per invocation of the Tor process.
Previously we would log with every occurrence, which could cause
us to run out of disk space. Fixes bug 33093; bugfix
on 0.3.2.2-alpha.
- When logging a bug, do not say "Future instances of this warning
will be silenced" unless we are actually going to silence them.
Previously we would say this whenever a BUG() check failed in the
code. Fixes bug 33095; bugfix on 0.4.1.1-alpha.
o Minor bugfixes (onion service v2):
- Move a series of v2 onion service warnings to protocol-warning
level because they can all be triggered remotely by a malformed
request. Fixes bug 32706; bugfix on 0.1.1.14-alpha.
o Minor bugfixes (onion service v3, client authorization):
- When removing client authorization credentials using the control
port, also remove the associated descriptor, so the onion service
can no longer be contacted. Fixes bug 33148; bugfix
on 0.4.3.1-alpha.
o Minor bugfixes (pluggable transports):
- When receiving a message on standard error from a pluggable
transport, log it at info level, rather than as a warning. Fixes
bug 33005; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (rust, build):
- Fix a syntax warning given by newer versions of Rust that was
creating problems for our continuous integration. Fixes bug 33212;
bugfix on 0.3.5.1-alpha.
o Minor bugfixes (TLS bug handling):
- When encountering a bug in buf_read_from_tls(), return a "MISC"
error code rather than "WANTWRITE". This change might help avoid
some CPU-wasting loops if the bug is ever triggered. Bug reported
by opara. Fixes bug 32673; bugfix on 0.3.0.4-alpha.
o Code simplification and refactoring (mainloop):
- Simplify the ip_address_changed() function by removing redundant
checks. Closes ticket 33091.
o Documentation (manpage):
- Split "Circuit Timeout" options and "Node Selection" options into
their own sections of the tor manpage. Closes tickets 32928 and
32929. Work by Swati Thacker as part of Google Season of Docs.
Changes in version 0.4.2.6 - 2020-01-30
This is the second stable release in the 0.4.2.x series. It backports
several bugfixes from 0.4.3.1-alpha, including some that had affected
the Linux seccomp2 sandbox or Windows services. If you're running with
one of those configurations, you'll probably want to upgrade;
otherwise, you should be fine with 0.4.2.5.
o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha):
- Correct how we use libseccomp. Particularly, stop assuming that
rules are applied in a particular order or that more rules are
processed after the first match. Neither is the case! In
libseccomp <2.4.0 this led to some rules having no effect.
libseccomp 2.4.0 changed how rules are generated, leading to a
different ordering, which in turn led to a fatal crash during
startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
Peter Gerber.
- Fix crash when reloading logging configuration while the
experimental sandbox is enabled. Fixes bug 32841; bugfix on
0.4.1.7. Patch by Peter Gerber.
o Minor bugfixes (correctness checks, backport from 0.4.3.1-alpha):
- Use GCC/Clang's printf-checking feature to make sure that
tor_assertf() arguments are correctly typed. Fixes bug 32765;
bugfix on 0.4.1.1-alpha.
o Minor bugfixes (logging, crash, backport from 0.4.3.1-alpha):
- Avoid a possible crash when trying to log a (fatal) assertion
failure about mismatched magic numbers in configuration objects.
Fixes bug 32771; bugfix on 0.4.2.1-alpha.
o Minor bugfixes (testing, backport from 0.4.3.1-alpha):
- When TOR_DISABLE_PRACTRACKER is set, do not apply it to the
test_practracker.sh script. Doing so caused a test failure. Fixes
bug 32705; bugfix on 0.4.2.1-alpha.
- When TOR_DISABLE_PRACTRACKER is set, log a notice to stderr when
skipping practracker checks. Fixes bug 32705; bugfix
on 0.4.2.1-alpha.
o Minor bugfixes (windows service, backport from 0.4.3.1-alpha):
- Initialize the publish/subscribe system when running as a windows
service. Fixes bug 32778; bugfix on 0.4.1.1-alpha.
o Testing (backport from 0.4.3.1-alpha):
- Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
fix the sandbox errors in 32722. Closes ticket 32240.
- Re-enable the Travis CI macOS Chutney build, but don't let it
prevent the Travis job from finishing. (The Travis macOS jobs are
slow, so we don't want to have it delay the whole CI process.)
Closes ticket 32629.
o Testing (continuous integration, backport from 0.4.3.1-alpha):
- Use zstd in our Travis Linux builds. Closes ticket 32242.
Changes in version 0.4.1.8 - 2020-01-30
This release backports several bugfixes from later release series,
including some that had affected the Linux seccomp2 sandbox or Windows
services. If you're running with one of those configurations, you'll
probably want to upgrade; otherwise, you should be fine with your
current version of 0.4.1.x.
o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha):
- Correct how we use libseccomp. Particularly, stop assuming that
rules are applied in a particular order or that more rules are
processed after the first match. Neither is the case! In
libseccomp <2.4.0 this led to some rules having no effect.
libseccomp 2.4.0 changed how rules are generated, leading to a
different ordering, which in turn led to a fatal crash during
startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
Peter Gerber.
- Fix crash when reloading logging configuration while the
experimental sandbox is enabled. Fixes bug 32841; bugfix on
0.4.1.7. Patch by Peter Gerber.
o Minor bugfixes (crash, backport form 0.4.2.4-rc):
- When running Tor with an option like --verify-config or
--dump-config that does not start the event loop, avoid crashing
if we try to exit early because of an error. Fixes bug 32407;
bugfix on 0.3.3.1-alpha.
o Minor bugfixes (windows service, backport from 0.4.3.1-alpha):
- Initialize the publish/subscribe system when running as a windows
service. Fixes bug 32778; bugfix on 0.4.1.1-alpha.
o Testing (backport from 0.4.3.1-alpha):
- Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
fix the sandbox errors in 32722. Closes ticket 32240.
- Re-enable the Travis CI macOS Chutney build, but don't let it
prevent the Travis job from finishing. (The Travis macOS jobs are
slow, so we don't want to have it delay the whole CI process.)
Closes ticket 32629.
o Testing (continuous integration, backport from 0.4.3.1-alpha):
- Use zstd in our Travis Linux builds. Closes ticket 32242.
Changes in version 0.4.3.1-alpha - 2020-01-22
This is the first alpha release in the 0.4.3.x series. It includes
improved support for application integration of onion services, support
for building in a client-only mode, and newly improved internal
documentation (online at https://src-ref.docs.torproject.org/tor/). It
also has numerous other small bugfixes and features, as well as
improvements to our code's internal organization that should help us
write better code in the future.
o New system requirements:
- When building Tor, you now need to have Python 3 in order to run
the integration tests. (Python 2 is officially unsupported
upstream, as of 1 Jan 2020.) Closes ticket 32608.
o Major features (build system):
- The relay code can now be disabled using the --disable-module-relay
configure option. When this option is set, we also disable the
dirauth module. Closes ticket 32123.
- When Tor is compiled --disable-module-relay, we also omit the code
used to act as a directory cache. Closes ticket 32487.
o Major features (directory authority, ed25519):
- Add support for banning a relay's ed25519 keys in the approved-
routers file. This will help us migrate away from RSA keys in the
future. Previously, only RSA keys could be banned in approved-
routers. Resolves ticket 22029. Patch by Neel Chauhan.
o Major features (onion service, controller):
- New control port commands to manage client-side onion service
authorization credentials. The ONION_CLIENT_AUTH_ADD command adds
a credential, ONION_CLIENT_AUTH_REMOVE deletes a credential, and
ONION_CLIENT_AUTH_VIEW lists the credentials. Closes ticket 30381.
o Major features (onion service, SOCKS5):
- Introduce a new SocksPort flag, ExtendedErrors, to support more
detailed error codes in information for applications that support
them. Closes ticket 30382; implements proposal 304.
o Major features (proxy):
- In addition to its current supported proxy types (HTTP CONNECT,
SOCKS4, and SOCKS5), Tor can now make its OR connections through a
HAProxy server. A new torrc option was added to specify the
address/port of the server: TCPProxy <protocol> <host>:<port>.
Currently the only supported protocol for the option is haproxy.
Closes ticket 31518. Patch done by Suphanat Chunhapanya (haxxpop).
o Major bugfixes (linux seccomp sandbox):
- Correct how we use libseccomp. Particularly, stop assuming that
rules are applied in a particular order or that more rules are
processed after the first match. Neither is the case! In
libseccomp <2.4.0 this led to some rules having no effect.
libseccomp 2.4.0 changed how rules are generated, leading to a
different ordering, which in turn led to a fatal crash during
startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
Peter Gerber.
- Fix crash when reloading logging configuration while the
experimental sandbox is enabled. Fixes bug 32841; bugfix on
0.4.1.7. Patch by Peter Gerber.
o Major bugfixes (networking):
- Correctly handle IPv6 addresses in SOCKS5 RESOLVE_PTR requests,
and accept strings as well as binary addresses. Fixes bug 32315;
bugfix on 0.3.5.1-alpha.
o Major bugfixes (onion service):
- Report HS circuit failure back into the HS subsystem so we take
appropriate action with regards to the client introduction point
failure cache. This improves reachability of onion services, since
now clients notice failing introduction circuits properly. Fixes
bug 32020; bugfix on 0.3.2.1-alpha.
o Minor feature (configure, build system):
- Output a list of enabled/disabled features at the end of the
configure process in a pleasing way. Closes ticket 31373.
o Minor feature (heartbeat, onion service):
- Add the DoS INTRODUCE2 defenses counter to the heartbeat DoS
message. Closes ticket 31371.
o Minor features (configuration validation):
- Configuration validation can now be done by per-module callbacks,
rather than a global validation function. This will let us reduce
the size of config.c and some of its more cumbersome functions.
Closes ticket 31241.
o Minor features (configuration):
- If a configured hardware crypto accelerator in AccelName is
prefixed with "!", Tor now exits when it cannot be found. Closes
ticket 32406.
- We now use flag-driven logic to warn about obsolete configuration
fields, so that we can include their names. In 0.4.2, we used a
special type, which prevented us from generating good warnings.
Implements ticket 32404.
o Minor features (controller):
- Add stream isolation data to STREAM event. Closes ticket 19859.
- Implement a new GETINFO command to fetch microdescriptor
consensus. Closes ticket 31684.
o Minor features (debugging, directory system):
- Don't crash when we find a non-guard with a guard-fraction value
set. Instead, log a bug warning, in an attempt to figure out how
this happened. Diagnostic for ticket 32868.
o Minor features (defense in depth):
- Add additional checks around tor_vasprintf() usage, in case the
function returns an error. Patch by Tobias Stoeckmann. Fixes
ticket 31147.
o Minor features (developer tooling):
- Remove the 0.2.9.x series branches from git scripts (git-merge-
forward.sh, git-pull-all.sh, git-push-all.sh, git-setup-dirs.sh).
Closes ticket 32772.
o Minor features (developer tools):
- Add a check_cocci_parse.sh script that checks that new code is
parseable by Coccinelle. Add an exceptions file for unparseable
files, and run the script from travis CI. Closes ticket 31919.
- Call the check_cocci_parse.sh script from a 'check-cocci' Makefile
target. Closes ticket 31919.
- Add a rename_c_identifiers.py tool to rename a bunch of C
identifiers at once, and generate a well-formed commit message
describing the change. This should help with refactoring. Closes
ticket 32237.
- Add some scripts in "scripts/coccinelle" to invoke the Coccinelle
semantic patching tool with the correct flags. These flags are
fairly easy to forget, and these scripts should help us use
Coccinelle more effectively in the future. Closes ticket 31705.
o Minor features (Doxygen):
- Update Doxygen configuration file to a more recent template (from
1.8.15). Closes ticket 32110.
- "make doxygen" now works with out-of-tree builds. Closes
ticket 32113.
- Make sure that doxygen outputs documentation for all of our C
files. Previously, some were missing @file declarations, causing
them to be ignored. Closes ticket 32307.
- Our "make doxygen" target now respects --enable-fatal-warnings by
default, and does not warn about items that are missing
documentation. To warn about missing documentation, run configure
with the "--enable-missing-doc-warnings" flag: doing so suspends
fatal warnings for doxygen. Closes ticket 32385.
o Minor features (git scripts):
- Add TOR_EXTRA_CLONE_ARGS to git-setup-dirs.sh for git clone
customisation. Closes ticket 32347.
- Add git-setup-dirs.sh, which sets up an upstream git repository
and worktrees for tor maintainers. Closes ticket 29603.
- Add TOR_EXTRA_REMOTE_* to git-setup-dirs.sh for a custom extra
remote. Closes ticket 32347.
- Call the check_cocci_parse.sh script from the git commit and push
hooks. Closes ticket 31919.
- Make git-push-all.sh skip unchanged branches when pushing to
upstream. The script already skipped unchanged test branches.
Closes ticket 32216.
- Make git-setup-dirs.sh create a master symlink in the worktree
directory. Closes ticket 32347.
- Skip unmodified source files when doing some existing git hook
checks. Related to ticket 31919.
o Minor features (IPv6, client):
- Make Tor clients tell dual-stack exits that they prefer IPv6
connections. This change is equivalent to setting the PreferIPv6
flag on SOCKSPorts (and most other listener ports). Tor Browser
has been setting this flag for some time, and we want to remove a
client distinguisher at exits. Closes ticket 32637.
o Minor features (portability, android):
- When building for Android, disable some tests that depend on $HOME
and/or pwdb, which Android doesn't have. Closes ticket 32825.
Patch from Hans-Christoph Steiner.
o Minor features (relay modularity):
- Split the relay and server pluggable transport config code into
separate files in the relay module. Disable this code when the
relay module is disabled. Closes part of ticket 32213.
- When the relay module is disabled, reject attempts to set the
ORPort, DirPort, DirCache, BridgeRelay, ExtORPort, or
ServerTransport* options, rather than ignoring the values of these
options. Closes part of ticket 32213.
o Minor features (relay):
- When the relay module is disabled, change the default config so
that DirCache is 0, and ClientOnly is 1. Closes ticket 32410.
o Minor features (release tools):
- Port our ChangeLog formatting and sorting tools to Python 3.
Closes ticket 32704.
o Minor features (testing):
- Detect some common failure cases for test_parseconf.sh in
src/test/conf_failures. Closes ticket 32451.
- Allow test_parseconf.sh to test expected log outputs for successful
configs, as well as failed configs. Closes ticket 32451.
- The test_parseconf.sh script now supports result variants for any
combination of the optional libraries lzma, nss, and zstd. Closes
ticket 32397.
o Minor features (tests, Android):
- When running the unit tests on Android, create temporary files in
a subdirectory of /data/local/tmp. Closes ticket 32172. Based on a
patch from Hans-Christoph Steiner.
o Minor bugfixes (bridges):
- Lowercase the configured value of BridgeDistribution before adding
it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
o Minor bugfixes (build system):
- Fix "make autostyle" for out-of-tree builds. Fixes bug 32370;
bugfix on 0.4.1.2-alpha.
o Minor bugfixes (configuration handling):
- Make control_event_conf_changed() take in a config_line_t instead
of a smartlist of alternating key/value entries. Fixes bug 31531;
bugfix on 0.2.3.3-alpha. Patch by Neel Chauhan.
o Minor bugfixes (configuration):
- Check for multiplication overflow when parsing memory units inside
configuration. Fixes bug 30920; bugfix on 0.0.9rc1.
- When dumping the configuration, stop adding a trailing space after
the option name when there is no option value. This issue only
affects options that accept an empty value or list. (Most options
reject empty values, or delete the entire line from the dumped
options.) Fixes bug 32352; bugfix on 0.0.9pre6.
- Avoid changing the user's value of HardwareAccel as stored by
SAVECONF, when AccelName is set but HardwareAccel is not. Fixes
bug 32382; bugfix on 0.2.2.1-alpha.
- When creating a KeyDirectory with the same location as the
DataDirectory (not recommended), respect the DataDirectory's
group-readable setting if one has not been set for the
KeyDirectory. Fixes bug 27992; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (controller):
- In routerstatus_has_changed(), check all the fields that are
output over the control port. Fixes bug 20218; bugfix
on 0.1.1.11-alpha
o Minor bugfixes (correctness checks):
- Use GCC/Clang's printf-checking feature to make sure that
tor_assertf() arguments are correctly typed. Fixes bug 32765;
bugfix on 0.4.1.1-alpha.
o Minor bugfixes (developer tools):
- Allow paths starting with ./ in scripts/add_c_file.py. Fixes bug
31336; bugfix on 0.4.1.2-alpha.
o Minor bugfixes (dirauth module):
- Split the dirauth config code into a separate file in the dirauth
module. Disable this code when the dirauth module is disabled.
Closes ticket 32213.
- When the dirauth module is disabled, reject attempts to set the
AuthoritativeDir option, rather than ignoring the value of the
option. Fixes bug 32213; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (embedded Tor):
- When starting Tor any time after the first time in a process,
register the thread in which it is running as the main thread.
Previously, we only did this on Windows, which could lead to bugs
like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (git scripts):
- Avoid sleeping before the last push in git-push-all.sh. Closes
ticket 32216.
- Forward all unrecognised arguments in git-push-all.sh to git push.
Closes ticket 32216.
o Minor bugfixes (hidden service v3):
- Do not rely on a "circuit established" flag for intro circuits but
instead always query the HS circuit map. This is to avoid sync
issue with that flag and the map. Fixes bug 32094; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (logging, crash):
- Avoid a possible crash when trying to log a (fatal) assertion
failure about mismatched magic numbers in configuration objects.
Fixes bug 32771; bugfix on 0.4.2.1-alpha.
o Minor bugfixes (onion service v2):
- When sending the INTRO cell for a v2 Onion Service, look at the
failure cache alongside timeout values to check if the intro point
is marked as failed. Previously, we only looked at the relay
timeout values. Fixes bug 25568; bugfix on 0.2.7.3-rc. Patch by
Neel Chauhan.
o Minor bugfixes (onion services v3, client):
- Properly handle the client rendezvous circuit timeout. Previously
Tor would sometimes timeout a rendezvous circuit awaiting the
introduction ACK, and find itself unable to re-establish all
circuits because the rendezvous circuit timed out too early. Fixes
bug 32021; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (onion services):
- In cancel_descriptor_fetches(), use
connection_list_by_type_purpose() instead of
connection_list_by_type_state(). Fixes bug 32639; bugfix on
0.3.2.1-alpha. Patch by Neel Chauhan.
o Minor bugfixes (scripts):
- Fix update_versions.py for out-of-tree builds. Fixes bug 32371;
bugfix on 0.4.0.1-alpha.
o Minor bugfixes (test):
- Use the same code to find the tor binary in all of our test
scripts. This change makes sure we are always using the coverage
binary when coverage is enabled. Fixes bug 32368; bugfix
on 0.2.7.3-rc.
o Minor bugfixes (testing):
- Stop ignoring "tor --dump-config" errors in test_parseconf.sh.
Fixes bug 32468; bugfix on 0.4.2.1-alpha.
- When TOR_DISABLE_PRACTRACKER is set, do not apply it to the
test_practracker.sh script. Doing so caused a test failure. Fixes
bug 32705; bugfix on 0.4.2.1-alpha.
- When TOR_DISABLE_PRACTRACKER is set, log a notice to stderr when
skipping practracker checks. Fixes bug 32705; bugfix
on 0.4.2.1-alpha.
o Minor bugfixes (tests):
- Our option-validation tests no longer depend on specially
configured non-default, non-passing sets of options. Previously,
the tests had been written to assume that options would _not_ be
set to their defaults, which led to needless complexity and
verbosity. Fixes bug 32175; bugfix on 0.2.8.1-alpha.
o Minor bugfixes (windows service):
- Initialize the publish/subscribe system when running as a windows
service. Fixes bug 32778; bugfix on 0.4.1.1-alpha.
o Deprecated features:
- Deprecate the ClientAutoIPv6ORPort option. This option was not
true "Happy Eyeballs", and often failed on connections that
weren't reliably dual-stack. Closes ticket 32942. Patch by
Neel Chauhan.
o Documentation:
- Provide a quickstart guide for a Circuit Padding Framework, and
documentation for researchers to implement and study circuit
padding machines. Closes ticket 28804.
- Add documentation in 'HelpfulTools.md' to describe how to build a
tag file. Closes ticket 32779.
- Create a high-level description of the long-term software
architecture goals. Closes ticket 32206.
- Describe the --dump-config command in the manual page. Closes
ticket 32467.
- Unite coding advice from this_not_that.md in torguts repo into our
coding standards document. Resolves ticket 31853.
o Removed features:
- Our Doxygen configuration no longer generates LaTeX output. The
reference manual produced by doing this was over 4000 pages long,
and generally unusable. Closes ticket 32099.
- The option "TestingEstimatedDescriptorPropagationTime" is now
marked as obsolete. It has had no effect since 0.3.0.7, when
clients stopped rejecting consensuses "from the future". Closes
ticket 32807.
- We no longer support consensus methods before method 28; these
methods were only used by authorities running versions of Tor that
are now at end-of-life. In effect, this means that clients,
relays, and authorities now assume that authorities will be
running version 0.3.5.x or later. Closes ticket 32695.
o Testing:
- Add more test cases for tor's UTF-8 validation function. Also,
check the arguments passed to the function for consistency. Closes
ticket 32845.
- Improve test coverage for relay and dirauth config code, focusing
on option validation and normalization. Closes ticket 32213.
- Improve the consistency of test_parseconf.sh output, and run all
the tests, even if one fails. Closes ticket 32213.
- Re-enable the Travis CI macOS Chutney build, but don't let it
prevent the Travis job from finishing. (The Travis macOS jobs are
slow, so we don't want to have it delay the whole CI process.)
Closes ticket 32629.
- Run the practracker unit tests in the pre-commit git hook. Closes
ticket 32609.
- Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
fix the sandbox errors in 32722. Closes ticket 32240.
o Code simplification and refactoring (channel):
- Channel layer had a variable length cell handler that was not used
and thus removed. Closes ticket 32892.
o Code simplification and refactoring (configuration):
- Immutability is now implemented as a flag on individual
configuration options rather than as part of the option-transition
checking code. Closes ticket 32344.
- Instead of keeping a list of configuration options to check for
relative paths, check all the options whose type is "FILENAME".
Solves part of ticket 32339.
- Our default log (which ordinarily sends NOTICE-level messages to
standard output) is now handled in a more logical manner.
Previously, we replaced the configured log options if they were
empty. Now, we interpret an empty set of log options as meaning
"use the default log". Closes ticket 31999.
- Remove some unused arguments from the options_validate() function,
to simplify our code and tests. Closes ticket 32187.
- Simplify the options_validate() code so that it looks at the
default options directly, rather than taking default options as an
argument. This change lets us simplify its interface. Closes
ticket 32185.
- Use our new configuration architecture to move most authority-
related options to the directory authority module. Closes
ticket 32806.
- When parsing the command line, handle options that determine our
"quiet level" and our mode of operation (e.g., --dump-config and
so on) all in one table. Closes ticket 32003.
o Code simplification and refactoring (controller):
- Create a new abstraction for formatting control protocol reply
lines based on key-value pairs. Refactor some existing control
protocol code to take advantage of this. Closes ticket 30984.
- Create a helper function that can fetch network status or
microdesc consensuses. Closes ticket 31684.
o Code simplification and refactoring (dirauth modularization):
- Remove the last remaining HAVE_MODULE_DIRAUTH inside a function.
Closes ticket 32163.
- Replace some confusing identifiers in process_descs.c. Closes
ticket 29826.
- Simplify some relay and dirauth config code. Closes ticket 32213.
o Code simplification and refactoring (misc):
- Make all the structs we declare follow the same naming convention
of ending with "_t". Closes ticket 32415.
- Move and rename some configuration-related code for clarity.
Closes ticket 32304.
- Our include.am files are now broken up by subdirectory.
Previously, src/core/include.am covered all of the subdirectories
in "core", "feature", and "app". Closes ticket 32137.
- Remove underused NS*() macros from test code: they make our tests
more confusing, especially for code-formatting tools. Closes
ticket 32887.
o Code simplification and refactoring (relay modularization):
- Disable relay_periodic when the relay module is disabled. Closes
ticket 32244.
- Disable relay_sys when the relay module is disabled. Closes
ticket 32245.
o Code simplification and refactoring (tool support):
- Add numerous missing dependencies to our include files, so that
they can be included in different reasonable orders and still
compile. Addresses part of ticket 32764.
- Fix some parts of our code that were difficult for Coccinelle to
parse. Related to ticket 31705.
- Fix some small issues in our code that prevented automatic
formatting tools from working. Addresses part of ticket 32764.
o Documentation (manpage):
- Alphabetize the Client Options section of the tor manpage. Closes
ticket 32846.
- Alphabetize the General Options section of the tor manpage. Closes
ticket 32708.
- In the tor(1) manpage, reword and improve formatting of the
COMMAND-LINE OPTIONS and DESCRIPTION sections. Closes ticket
32277. Based on work by Swati Thacker as part of Google Season
of Docs.
- In the tor(1) manpage, reword and improve formatting of the FILES,
SEE ALSO, and BUGS sections. Closes ticket 32176. Based on work by
Swati Thacker as part of Google Season of Docs.
o Testing (circuit, EWMA):
- Add unit tests for circuitmux and EWMA subsystems. Closes
ticket 32196.
o Testing (continuous integration):
- Use zstd in our Travis Linux builds. Closes ticket 32242.
Changes in version 0.4.2.5 - 2019-12-09
This is the first stable release in the 0.4.2.x series. This series
improves reliability and stability, and includes several stability and
correctness improvements for onion services. It also fixes many smaller
bugs present in previous series.
Per our support policy, we will support the 0.4.2.x series for nine
months, or until three months after the release of a stable 0.4.3.x:
whichever is longer. If you need longer-term support, please stick
with 0.3.5.x, which will we plan to support until Feb 2022.
Per our support policy, we will support the 0.4.2.x series for nine
months, or until three months after the release of a stable 0.4.3.x:
whichever is longer. If you need longer-term support, please stick
with 0.3.5.x, which will we plan to support until Feb 2022.
Below are the changes since 0.4.1.4-rc. For a complete list of changes
since 0.4.1.5, see the ReleaseNotes file.
o Minor features (geoip):
- Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
Country database. Closes ticket 32685.
o Testing:
- Require C99 standards-conforming code in Travis CI, but allow GNU
gcc extensions. Also activates clang's -Wtypedef-redefinition
warnings. Build some jobs with -std=gnu99, and some jobs without.
Closes ticket 32500.
Changes in version 0.4.1.7 - 2019-12-09
This release backports several bugfixes to improve stability and
correctness. Anyone experiencing build problems or crashes with 0.4.1.6,
including all relays relying on AccountingMax, should upgrade.
o Major features (directory authorities, backport from 0.4.2.2-alpha):
- Directory authorities now reject relays running all currently
deprecated release series. The currently supported release series
are: 0.2.9, 0.3.5, 0.4.0, 0.4.1, and 0.4.2. Closes ticket 31549.
o Major bugfixes (embedded Tor, backport from 0.4.2.2-alpha):
- Avoid a possible crash when restarting Tor in embedded mode and
enabling a different set of publish/subscribe messages. Fixes bug
31898; bugfix on 0.4.1.1-alpha.
o Major bugfixes (relay, backport from 0.4.2.3-alpha):
- Relays now respect their AccountingMax bandwidth again. When
relays entered "soft" hibernation (which typically starts when
we've hit 90% of our AccountingMax), we had stopped checking
whether we should enter hard hibernation. Soft hibernation refuses
new connections and new circuits, but the existing circuits can
continue, meaning that relays could have exceeded their configured
AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.
o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha):
- Stop ignoring torrc options after an %include directive, when the
included directory ends with a file that does not contain any
config options (but does contain comments or whitespace). Fixes
bug 31408; bugfix on 0.3.1.1-alpha.
o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha):
- Onion services now always use the exact number of intro points
configured with the HiddenServiceNumIntroductionPoints option (or
fewer if nodes are excluded). Before, a service could sometimes
pick more intro points than configured. Fixes bug 31548; bugfix
on 0.3.2.1-alpha.
o Minor features (continuous integration, backport from 0.4.2.2-alpha):
- When building on Appveyor and Travis, pass the "-k" flag to make,
so that we are informed of all compilation failures, not just the
first one or two. Closes ticket 31372.
o Minor features (geoip, backport from 0.4.2.5):
- Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
Country database. Closes ticket 32685.
o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha):
- Avoid spurious errors when Appveyor CI fails before the install step.
Fixes bug 31884; bugfix on 0.3.4.2-alpha.
o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc):
- Fix a BUG() assertion that occurs within a very small race window
between when a client intro circuit opens and when its descriptor
gets cleaned up from the cache. The circuit is now closed early,
which will trigger a re-fetch of the descriptor and continue the
connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (connections, backport from 0.4.2.3-rc):
- Avoid trying to read data from closed connections, which can cause
needless loops in Libevent and infinite loops in Shadow. Fixes bug
30344; bugfix on 0.1.1.1-alpha.
o Minor bugfixes (error handling, backport from 0.4.2.1-alpha):
- On abort, try harder to flush the output buffers of log messages.
On some platforms (macOS), log messages could be discarded when
the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
- Report the tor version whenever an assertion fails. Previously, we
only reported the Tor version on some crashes, and some non-fatal
assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
- When tor aborts due to an error, close log file descriptors before
aborting. Closing the logs makes some OSes flush log file buffers,
rather than deleting buffered log lines. Fixes bug 31594; bugfix
on 0.2.5.2-alpha.
o Minor bugfixes (logging, backport from 0.4.2.2-alpha):
- Add a missing check for HAVE_PTHREAD_H, because the backtrace code
uses mutexes. Fixes bug 31614; bugfix on 0.2.5.2-alpha.
- Disable backtrace signal handlers when shutting down tor. Fixes
bug 31614; bugfix on 0.2.5.2-alpha.
- Rate-limit the logging message about the obsolete .exit
notation. Previously, there was no limit on this warning, which
could potentially be triggered many times by a hostile website.
Fixes bug 31466; bugfix on 0.2.2.1-alpha.
o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha):
- Do not log a nonfatal assertion failure when receiving a VERSIONS
cell on a connection using the obsolete v1 link protocol. Log a
protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha):
- Reset the periodic events' "enabled" flag when Tor is shut down
cleanly. Previously, this flag was left on, which caused periodic
events not to be re-enabled when Tor was relaunched in-process
with tor_api.h after a shutdown. Fixes bug 32058; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (multithreading, backport from 0.4.2.2-alpha):
- Avoid some undefined behaviour when freeing mutexes. Fixes bug
31736; bugfix on 0.0.7.
o Minor bugfixes (process management, backport from 0.4.2.3-alpha):
- Remove overly strict assertions that triggered when a pluggable
transport failed to launch. Fixes bug 31091; bugfix
on 0.4.0.1-alpha.
- Remove an assertion in the Unix process backend. This assertion
would trigger when we failed to find the executable for a child
process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (relay, backport from 0.4.2.2-alpha):
- Avoid crashing when starting with a corrupt keys directory where
the old ntor key and the new ntor key are identical. Fixes bug
30916; bugfix on 0.2.4.8-alpha.
o Minor bugfixes (testing, backport from 0.4.2.3-alpha):
- When testing port rebinding, don't busy-wait for tor to log.
Instead, actually sleep for a short time before polling again.
Also improve the formatting of control commands and log messages.
Fixes bug 31837; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (tests, SunOS, backport from 0.4.2.2-alpha):
- Avoid a map_anon_nofork test failure due to a signed/unsigned
integer comparison. Fixes bug 31897; bugfix on 0.4.1.1-alpha.
o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha):
- Log bugs about the TLS read buffer's length only once, rather than
filling the logs with similar warnings. Fixes bug 31939; bugfix
on 0.3.0.4-rc.
o Documentation (backport from 0.4.2.2-alpha):
- Explain why we can't destroy the backtrace buffer mutex. Explain
why we don't need to destroy the log mutex. Closes ticket 31736.
o Testing (continuous integration, backport from 0.4.2.3-alpha):
- Disable all but one Travis CI macOS build, to mitigate slow
scheduling of Travis macOS jobs. Closes ticket 32177.
- Run the chutney IPv6 networks as part of Travis CI. Closes
ticket 30860.
- Simplify the Travis CI build matrix, and optimise for build time.
Closes ticket 31859.
- Use Windows Server 2019 instead of Windows Server 2016 in our
Appveyor builds. Closes ticket 32086.
o Testing (continuous integration, backport from 0.4.2.4-rc):
- In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
- Use Ubuntu Bionic images for our Travis CI builds, so we can get a
recent version of coccinelle. But leave chutney on Ubuntu Trusty,
until we can fix some Bionic permissions issues (see ticket
32240). Related to ticket 31919.
- Install the mingw OpenSSL package in Appveyor. This makes sure
that the OpenSSL headers and libraries match in Tor's Appveyor
builds. (This bug was triggered by an Appveyor image update.)
Fixes bug 32449; bugfix on 0.3.5.6-rc.
o Testing (continuous integration, backport from 0.4.2.5):
- Require C99 standards-conforming code in Travis CI, but allow GNU gcc
extensions. Also activates clang's -Wtypedef-redefinition warnings.
Build some jobs with -std=gnu99, and some jobs without.
Closes ticket 32500.
Changes in version 0.4.0.6 - 2019-12-09
This is the second stable release in the 0.4.0.x series. This release
backports several bugfixes to improve stability and correctness. Anyone
experiencing build problems or crashes with 0.4.0.5, including all relays
relying on AccountingMax, should upgrade.
Note that, per our support policy, support for the 0.4.0.x series will end
on 2 Feb 2020. Anyone still running 0.4.0.x should plan to upgrade to the
latest stable release, or downgrade to 0.3.5.x, which will get long-term
support until 1 Feb 2022.
o Directory authority changes (backport from 0.4.1.5):
- The directory authority "dizum" has a new IP address. Closes
ticket 31406.
o Major bugfixes (bridges, backport from 0.4.1.2-alpha):
- Consider our directory information to have changed when our list
of bridges changes. Previously, Tor would not re-compute the
status of its directory information when bridges changed, and
therefore would not realize that it was no longer able to build
circuits. Fixes part of bug 29875.
- Do not count previously configured working bridges towards our
total of working bridges. Previously, when Tor's list of bridges
changed, it would think that the old bridges were still usable,
and delay fetching router descriptors for the new ones. Fixes part
of bug 29875; bugfix on 0.3.0.1-alpha.
o Major bugfixes (circuit build, guard, backport from 0.4.1.4-rc):
- When considering upgrading circuits from "waiting for guard" to
"open", always ignore circuits that are marked for close. Otherwise,
we can end up in the situation where a subsystem is notified that
a closing circuit has just opened, leading to undesirable
behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.
o Major bugfixes (Onion service reachability, backport from 0.4.1.3-alpha):
- Properly clean up the introduction point map when circuits change
purpose from onion service circuits to pathbias, measurement, or
other circuit types. This should fix some service-side instances
of introduction point failure. Fixes bug 29034; bugfix
on 0.3.2.1-alpha.
o Major bugfixes (onion service v3, backport from 0.4.1.1-alpha):
- Fix an unreachable bug in which an introduction point could try to
send an INTRODUCE_ACK with a status code that Trunnel would refuse
to encode, leading the relay to assert(). We've consolidated the
ABI values into Trunnel now. Fixes bug 30454; bugfix
on 0.3.0.1-alpha.
- Clients can now handle unknown status codes from INTRODUCE_ACK
cells. (The NACK behavior will stay the same.) This will allow us
to extend status codes in the future without breaking the normal
client behavior. Fixes another part of bug 30454; bugfix
on 0.3.0.1-alpha.
o Major bugfixes (relay, backport from 0.4.2.3-alpha):
- Relays now respect their AccountingMax bandwidth again. When
relays entered "soft" hibernation (which typically starts when
we've hit 90% of our AccountingMax), we had stopped checking
whether we should enter hard hibernation. Soft hibernation refuses
new connections and new circuits, but the existing circuits can
continue, meaning that relays could have exceeded their configured
AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.
o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha):
- Stop ignoring torrc options after an %include directive, when the
included directory ends with a file that does not contain any
config options (but does contain comments or whitespace). Fixes
bug 31408; bugfix on 0.3.1.1-alpha.
o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha):
- Onion services now always use the exact number of intro points
configured with the HiddenServiceNumIntroductionPoints option (or
fewer if nodes are excluded). Before, a service could sometimes
pick more intro points than configured. Fixes bug 31548; bugfix
on 0.3.2.1-alpha.
o Minor features (compile-time modules, backport from version 0.4.1.1-alpha):
- Add a "--list-modules" command to print a list of which compile-
time modules are enabled. Closes ticket 30452.
o Minor features (continuous integration, backport from 0.4.1.1-alpha):
- Remove sudo configuration lines from .travis.yml as they are no
longer needed with current Travis build environment. Resolves
issue 30213.
o Minor features (continuous integration, backport from 0.4.1.4-rc):
- Our Travis configuration now uses Chutney to run some network
integration tests automatically. Closes ticket 29280.
o Minor features (continuous integration, backport from 0.4.2.2-alpha):
- When building on Appveyor and Travis, pass the "-k" flag to make,
so that we are informed of all compilation failures, not just the
first one or two. Closes ticket 31372.
o Minor features (fallback directory list, backport from 0.4.1.4-rc):
- Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc
in December 2018 (of which ~122 were still functional), with a
list of 148 fallbacks (70 new, 78 existing, 79 removed) generated
in June 2019. Closes ticket 28795.
o Minor features (geoip, backport from 0.4.2.5):
- Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
Country database. Closes ticket 32685.
o Minor features (stem tests, backport from 0.4.2.1-alpha):
- Change "make test-stem" so it only runs the stem tests that use
tor. This change makes test-stem faster and more reliable. Closes
ticket 31554.
o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha):
- Avoid spurious errors when Appveyor CI fails before the install step.
Fixes bug 31884; bugfix on 0.3.4.2-alpha.
o Minor bugfixes (build system, backport form 0.4.2.1-alpha):
- Do not include the deprecated <sys/sysctl.h> on Linux or Windows
systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
o Minor bugfixes (circuit isolation, backport from 0.4.1.3-alpha):
- Fix a logic error that prevented the SessionGroup sub-option from
being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (circuit padding, backport from 0.4.1.4-rc):
- On relays, properly check that a padding machine is absent before
logging a warning about it being absent. Fixes bug 30649; bugfix
on 0.4.0.1-alpha.
o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc):
- Fix a BUG() assertion that occurs within a very small race window
between when a client intro circuit opens and when its descriptor
gets cleaned up from the cache. The circuit is now closed early,
which will trigger a re-fetch of the descriptor and continue the
connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (clock skew detection, backport from 0.4.1.5):
- Don't believe clock skew results from NETINFO cells that appear to
arrive before we sent the VERSIONS cells they are responding to.
Previously, we would accept them up to 3 minutes "in the past".
Fixes bug 31343; bugfix on 0.2.4.4-alpha.
o Minor bugfixes (compilation warning, backport from 0.4.1.5):
- Fix a compilation warning on Windows about casting a function
pointer for GetTickCount64(). Fixes bug 31374; bugfix
on 0.2.9.1-alpha.
o Minor bugfixes (compilation, backport from 0.4.1.5):
- Avoid using labs() on time_t, which can cause compilation warnings
on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
o Minor bugfixes (compilation, backport from 0.4.2.1-alpha):
- Suppress spurious float-conversion warnings from GCC when calling
floating-point classifier functions on FreeBSD. Fixes part of bug
31687; bugfix on 0.3.1.5-alpha.
o Minor bugfixes (compilation, unusual configurations, backport from 0.4.1.1-alpha):
- Avoid failures when building with the ALL_BUGS_ARE_FATAL option
due to missing declarations of abort(), and prevent other such
failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (configuration, proxies, backport from 0.4.1.2-alpha):
- Fix a bug that prevented us from supporting SOCKS5 proxies that
want authentication along with configured (but unused!)
ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.
o Minor bugfixes (connections, backport from 0.4.2.3-rc):
- Avoid trying to read data from closed connections, which can cause
needless loops in Libevent and infinite loops in Shadow. Fixes bug
30344; bugfix on 0.1.1.1-alpha.
o Minor bugfixes (continuous integration, backport from 0.4.1.3-alpha):
- Allow the test-stem job to fail in Travis, because it sometimes
hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha.
- Skip test_rebind on macOS in Travis, because it is unreliable on
macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
- Skip test_rebind when the TOR_SKIP_TEST_REBIND environment
variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (crash on exit, backport from 0.4.1.4-rc):
- Avoid a set of possible code paths that could try to use freed
memory in routerlist_free() while Tor was exiting. Fixes bug
31003; bugfix on 0.1.2.2-alpha.
o Minor bugfixes (directory authorities, backport from 0.4.1.3-alpha):
- Stop crashing after parsing an unknown descriptor purpose
annotation. We think this bug can only be triggered by modifying a
local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.
o Minor bugfixes (directory authority, backport from 0.4.1.2-alpha):
- Move the "bandwidth-file-headers" line in directory authority
votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (error handling, backport from 0.4.2.1-alpha):
- On abort, try harder to flush the output buffers of log messages.
On some platforms (macOS), log messages could be discarded when
the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
- Report the tor version whenever an assertion fails. Previously, we
only reported the Tor version on some crashes, and some non-fatal
assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha):
- When extracting an IPv6 address from a PF-based proxy, verify that
we are actually configured to receive an IPv6 address, and log an
internal error if not. Fixes part of bug 31687; bugfix
on 0.2.3.4-alpha.
o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
- When tor is missing descriptors for some primary entry guards,
make the log message less alarming. It's normal for descriptors to
expire, as long as tor fetches new ones soon after. Fixes bug
31657; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (logging, backport from 0.4.1.1-alpha):
- Do not log a warning when running with an OpenSSL version other
than the one Tor was compiled with, if the two versions should be
compatible. Previously, we would warn whenever the version was
different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.
o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
- Change log level of message "Hash of session info was not as
expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
on 0.1.1.10-alpha.
o Minor bugfixes (logging, backport from 0.4.2.2-alpha):
- Rate-limit the logging message about the obsolete .exit
notation. Previously, there was no limit on this warning, which
could potentially be triggered many times by a hostile website.
Fixes bug 31466; bugfix on 0.2.2.1-alpha.
o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha):
- Do not log a nonfatal assertion failure when receiving a VERSIONS
cell on a connection using the obsolete v1 link protocol. Log a
protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha):
- Reset the periodic events' "enabled" flag when Tor is shut down
cleanly. Previously, this flag was left on, which caused periodic
events not to be re-enabled when Tor was relaunched in-process
with tor_api.h after a shutdown. Fixes bug 32058; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (memory leak, backport from 0.4.1.1-alpha):
- Avoid a minor memory leak that could occur on relays when failing
to create a "keys" directory. Fixes bug 30148; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (memory leak, backport from 0.4.1.4-rc):
- Fix a trivial memory leak when parsing an invalid value
from a download schedule in the configuration. Fixes bug
30894; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (NetBSD, backport from 0.4.1.2-alpha):
- Fix usage of minherit() on NetBSD and other platforms that define
MAP_INHERIT_{ZERO,NONE} instead of INHERIT_{ZERO,NONE}. Fixes bug
30614; bugfix on 0.4.0.2-alpha. Patch from Taylor Campbell.
o Minor bugfixes (onion services, backport from 0.4.1.1-alpha):
- Avoid a GCC 9.1.1 warning (and possible crash depending on libc
implementation) when failing to load an onion service client
authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (out-of-memory handler, backport from 0.4.1.2-alpha):
- When purging the DNS cache because of an out-of-memory condition,
try purging just the older entries at first. Previously, we would
always purge the whole thing. Fixes bug 29617; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (portability, backport from 0.4.1.2-alpha):
- Avoid crashing in our tor_vasprintf() implementation on systems
that define neither vasprintf() nor _vscprintf(). (This bug has
been here long enough that we question whether people are running
Tor on such systems, but we're applying the fix out of caution.)
Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by
Tobias Stoeckmann.
o Minor bugfixes (process management, backport from 0.4.2.3-alpha):
- Remove overly strict assertions that triggered when a pluggable
transport failed to launch. Fixes bug 31091; bugfix
on 0.4.0.1-alpha.
- Remove an assertion in the Unix process backend. This assertion
would trigger when we failed to find the executable for a child
process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (relay, backport from 0.4.2.2-alpha):
- Avoid crashing when starting with a corrupt keys directory where
the old ntor key and the new ntor key are identical. Fixes bug
30916; bugfix on 0.2.4.8-alpha.
o Minor bugfixes (rust, backport from 0.4.2.1-alpha):
- Correctly exclude a redundant rust build job in Travis. Fixes bug
31463; bugfix on 0.3.5.4-alpha.
o Minor bugfixes (testing, backport from 0.4.2.3-alpha):
- When testing port rebinding, don't busy-wait for tor to log.
Instead, actually sleep for a short time before polling again.
Also improve the formatting of control commands and log messages.
Fixes bug 31837; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha):
- Log bugs about the TLS read buffer's length only once, rather than
filling the logs with similar warnings. Fixes bug 31939; bugfix
on 0.3.0.4-rc.
o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
- Always retry v2 single onion service intro and rend circuits with
a 3-hop path. Previously, v2 single onion services used a 3-hop
path when rendezvous circuits were retried after a remote or
delayed failure, but a 1-hop path for immediate retries. Fixes bug
23818; bugfix on 0.2.9.3-alpha.
- Make v3 single onion services fall back to a 3-hop intro, when all
intro points are unreachable via a 1-hop path. Previously, v3
single onion services failed when all intro nodes were unreachable
via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
o Documentation (backport from 0.4.2.1-alpha):
- Use RFC 2397 data URL scheme to embed an image into tor-exit-
notice.html so that operators no longer have to host it
themselves. Closes ticket 31089.
o Testing (backport from 0.4.1.2-alpha):
- Specify torrc paths (with empty files) when launching tor in
integration tests; refrain from reading user and system torrcs.
Resolves issue 29702.
o Testing (continuous integration, backport from 0.4.1.1-alpha):
- In Travis, show stem's tor log after failure. Closes ticket 30234.
o Testing (continuous integration, backport from 0.4.1.5):
- In Travis, make stem log a controller trace to the console, and
tail stem's tor log after failure. Closes ticket 30591.
- In Travis, only run the stem tests that use a tor binary. Closes
ticket 30694.
o Testing (continuous integration, backport from 0.4.2.3-alpha):
- Disable all but one Travis CI macOS build, to mitigate slow
scheduling of Travis macOS jobs. Closes ticket 32177.
- Run the chutney IPv6 networks as part of Travis CI. Closes
ticket 30860.
- Simplify the Travis CI build matrix, and optimise for build time.
Closes ticket 31859.
- Use Windows Server 2019 instead of Windows Server 2016 in our
Appveyor builds. Closes ticket 32086.
o Testing (continuous integration, backport from 0.4.2.4-rc):
- Use Ubuntu Bionic images for our Travis CI builds, so we can get a
recent version of coccinelle. But leave chutney on Ubuntu Trusty,
until we can fix some Bionic permissions issues (see ticket
32240). Related to ticket 31919.
- Install the mingw OpenSSL package in Appveyor. This makes sure
that the OpenSSL headers and libraries match in Tor's Appveyor
builds. (This bug was triggered by an Appveyor image update.)
Fixes bug 32449; bugfix on 0.3.5.6-rc.
- In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
o Testing (continuous integration, backport from 0.4.2.5):
- Require C99 standards-conforming code in Travis CI, but allow GNU gcc
extensions. Also activates clang's -Wtypedef-redefinition warnings.
Build some jobs with -std=gnu99, and some jobs without.
Closes ticket 32500.
Changes in version 0.3.5.9 - 2019-12-09
Tor 0.3.5.9 backports serveral fixes from later releases, including
several that affect bridge users, relay stability, onion services,
and much more.
o Directory authority changes (backport from 0.4.1.5):
- The directory authority "dizum" has a new IP address. Closes
ticket 31406.
o Major bugfixes (bridges, backport from 0.4.1.2-alpha):
- Consider our directory information to have changed when our list
of bridges changes. Previously, Tor would not re-compute the
status of its directory information when bridges changed, and
therefore would not realize that it was no longer able to build
circuits. Fixes part of bug 29875.
- Do not count previously configured working bridges towards our
total of working bridges. Previously, when Tor's list of bridges
changed, it would think that the old bridges were still usable,
and delay fetching router descriptors for the new ones. Fixes part
of bug 29875; bugfix on 0.3.0.1-alpha.
o Major bugfixes (circuit build, guard, backport from 0.4.1.4-rc):
- When considering upgrading circuits from "waiting for guard" to
"open", always ignore circuits that are marked for close. Otherwise,
we can end up in the situation where a subsystem is notified that
a closing circuit has just opened, leading to undesirable
behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.
o Major bugfixes (NSS, relay, backport from 0.4.0.4-rc):
- When running with NSS, disable TLS 1.2 ciphersuites that use
SHA384 for their PRF. Due to an NSS bug, the TLS key exporters for
these ciphersuites don't work -- which caused relays to fail to
handshake with one another when these ciphersuites were enabled.
Fixes bug 29241; bugfix on 0.3.5.1-alpha.
o Major bugfixes (Onion service reachability, backport from 0.4.1.3-alpha):
- Properly clean up the introduction point map when circuits change
purpose from onion service circuits to pathbias, measurement, or
other circuit types. This should fix some service-side instances
of introduction point failure. Fixes bug 29034; bugfix
on 0.3.2.1-alpha.
o Major bugfixes (onion service v3, backport from 0.4.1.1-alpha):
- Fix an unreachable bug in which an introduction point could try to
send an INTRODUCE_ACK with a status code that Trunnel would refuse
to encode, leading the relay to assert(). We've consolidated the
ABI values into Trunnel now. Fixes bug 30454; bugfix
on 0.3.0.1-alpha.
- Clients can now handle unknown status codes from INTRODUCE_ACK
cells. (The NACK behavior will stay the same.) This will allow us
to extend status codes in the future without breaking the normal
client behavior. Fixes another part of bug 30454; bugfix
on 0.3.0.1-alpha.
o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha):
- Stop ignoring torrc options after an %include directive, when the
included directory ends with a file that does not contain any
config options (but does contain comments or whitespace). Fixes
bug 31408; bugfix on 0.3.1.1-alpha.
o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha):
- Onion services now always use the exact number of intro points
configured with the HiddenServiceNumIntroductionPoints option (or
fewer if nodes are excluded). Before, a service could sometimes
pick more intro points than configured. Fixes bug 31548; bugfix
on 0.3.2.1-alpha.
o Minor features (address selection, backport from 0.4.0.3-alpha):
- Treat the subnet 100.64.0.0/10 as public for some purposes;
private for others. This subnet is the RFC 6598 (Carrier Grade
NAT) IP range, and is deployed by many ISPs as an alternative to
RFC 1918 that does not break existing internal networks. Tor now
blocks SOCKS and control ports on these addresses and warns users
if client ports or ExtORPorts are listening on a RFC 6598 address.
Closes ticket 28525. Patch by Neel Chauhan.
o Minor features (bandwidth authority, backport from 0.4.0.4-rc):
- Make bandwidth authorities ignore relays that are reported in the
bandwidth file with the flag "vote=0". This change allows us to
report unmeasured relays for diagnostic reasons without including
their bandwidth in the bandwidth authorities' vote. Closes
ticket 29806.
o Minor features (compile-time modules, backport from version 0.4.1.1-alpha):
- Add a "--list-modules" command to print a list of which compile-
time modules are enabled. Closes ticket 30452.
o Minor features (continuous integration, backport from 0.4.0.4-rc):
- On Travis Rust builds, cleanup Rust registry and refrain from
caching the "target/" directory to speed up builds. Resolves
issue 29962.
o Minor features (continuous integration, backport from 0.4.0.5):
- In Travis, tell timelimit to use stem's backtrace signals, and
launch python directly from timelimit, so python receives the
signals from timelimit, rather than make. Closes ticket 30117.
o Minor features (continuous integration, backport from 0.4.1.1-alpha):
- Remove sudo configuration lines from .travis.yml as they are no
longer needed with current Travis build environment. Resolves
issue 30213.
o Minor features (continuous integration, backport from 0.4.1.4-rc):
- Our Travis configuration now uses Chutney to run some network
integration tests automatically. Closes ticket 29280.
o Minor features (continuous integration, backport from 0.4.2.2-alpha):
- When building on Appveyor and Travis, pass the "-k" flag to make,
so that we are informed of all compilation failures, not just the
first one or two. Closes ticket 31372.
o Minor features (fallback directory list, backport from 0.4.1.4-rc):
- Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc
in December 2018 (of which ~122 were still functional), with a
list of 148 fallbacks (70 new, 78 existing, 79 removed) generated
in June 2019. Closes ticket 28795.
o Minor features (geoip, backport from 0.4.2.5):
- Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
Country database. Closes ticket 32685.
o Minor features (NSS, diagnostic, backport from 0.4.0.4-rc):
- Try to log an error from NSS (if there is any) and a more useful
description of our situation if we are using NSS and a call to
SSL_ExportKeyingMaterial() fails. Diagnostic for ticket 29241.
o Minor features (stem tests, backport from 0.4.2.1-alpha):
- Change "make test-stem" so it only runs the stem tests that use
tor. This change makes test-stem faster and more reliable. Closes
ticket 31554.
o Minor bugfixes (security, backport from 0.4.0.4-rc):
- Verify in more places that we are not about to create a buffer
with more than INT_MAX bytes, to avoid possible OOB access in the
event of bugs. Fixes bug 30041; bugfix on 0.2.0.16. Found and
fixed by Tobias Stoeckmann.
- Fix a potential double free bug when reading huge bandwidth files.
The issue is not exploitable in the current Tor network because
the vulnerable code is only reached when directory authorities
read bandwidth files, but bandwidth files come from a trusted
source (usually the authorities themselves). Furthermore, the
issue is only exploitable in rare (non-POSIX) 32-bit architectures,
which are not used by any of the current authorities. Fixes bug
30040; bugfix on 0.3.5.1-alpha. Bug found and fixed by
Tobias Stoeckmann.
o Minor bugfix (continuous integration, backport from 0.4.0.4-rc):
- Reset coverage state on disk after Travis CI has finished. This
should prevent future coverage merge errors from causing the test
suite for the "process" subsystem to fail. The process subsystem
was introduced in 0.4.0.1-alpha. Fixes bug 29036; bugfix
on 0.2.9.15.
- Terminate test-stem if it takes more than 9.5 minutes to run.
(Travis terminates the job after 10 minutes of no output.)
Diagnostic for 29437. Fixes bug 30011; bugfix on 0.3.5.4-alpha.
o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha):
- Avoid spurious errors when Appveyor CI fails before the install step.
Fixes bug 31884; bugfix on 0.3.4.2-alpha.
o Minor bugfixes (build system, backport form 0.4.2.1-alpha):
- Do not include the deprecated <sys/sysctl.h> on Linux or Windows
systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
o Minor bugfixes (C correctness, backport from 0.4.0.4-rc):
- Fix an unlikely memory leak in consensus_diff_apply(). Fixes bug
29824; bugfix on 0.3.1.1-alpha. This is Coverity warning
CID 1444119.
o Minor bugfixes (circuit isolation, backport from 0.4.1.3-alpha):
- Fix a logic error that prevented the SessionGroup sub-option from
being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc):
- Fix a BUG() assertion that occurs within a very small race window
between when a client intro circuit opens and when its descriptor
gets cleaned up from the cache. The circuit is now closed early,
which will trigger a re-fetch of the descriptor and continue the
connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (clock skew detection, backport from 0.4.1.5):
- Don't believe clock skew results from NETINFO cells that appear to
arrive before we sent the VERSIONS cells they are responding to.
Previously, we would accept them up to 3 minutes "in the past".
Fixes bug 31343; bugfix on 0.2.4.4-alpha.
o Minor bugfixes (compilation warning, backport from 0.4.1.5):
- Fix a compilation warning on Windows about casting a function
pointer for GetTickCount64(). Fixes bug 31374; bugfix
on 0.2.9.1-alpha.
o Minor bugfixes (compilation, backport from 0.4.0.2-alpha):
- Silence a compiler warning in test-memwipe.c on OpenBSD. Fixes bug
29145; bugfix on 0.2.9.3-alpha. Patch from Kris Katterjohn.
o Minor bugfixes (compilation, backport from 0.4.1.5):
- Avoid using labs() on time_t, which can cause compilation warnings
on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
o Minor bugfixes (compilation, backport from 0.4.2.1-alpha):
- Suppress spurious float-conversion warnings from GCC when calling
floating-point classifier functions on FreeBSD. Fixes part of bug
31687; bugfix on 0.3.1.5-alpha.
o Minor bugfixes (compilation, unusual configurations, backport from 0.4.1.1-alpha):
- Avoid failures when building with the ALL_BUGS_ARE_FATAL option
due to missing declarations of abort(), and prevent other such
failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (configuration, proxies, backport from 0.4.1.2-alpha):
- Fix a bug that prevented us from supporting SOCKS5 proxies that
want authentication along with configured (but unused!)
ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.
o Minor bugfixes (connections, backport from 0.4.2.3-rc):
- Avoid trying to read data from closed connections, which can cause
needless loops in Libevent and infinite loops in Shadow. Fixes bug
30344; bugfix on 0.1.1.1-alpha.
o Minor bugfixes (continuous integration, backport from 0.4.1.3-alpha):
- Allow the test-stem job to fail in Travis, because it sometimes
hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha.
- Skip test_rebind on macOS in Travis, because it is unreliable on
macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
- Skip test_rebind when the TOR_SKIP_TEST_REBIND environment
variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (crash on exit, backport from 0.4.1.4-rc):
- Avoid a set of possible code paths that could try to use freed
memory in routerlist_free() while Tor was exiting. Fixes bug
31003; bugfix on 0.1.2.2-alpha.
o Minor bugfixes (directory authorities, backport from 0.4.1.3-alpha):
- Stop crashing after parsing an unknown descriptor purpose
annotation. We think this bug can only be triggered by modifying a
local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.
o Minor bugfixes (directory authority, backport from 0.4.1.2-alpha):
- Move the "bandwidth-file-headers" line in directory authority
votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (error handling, backport from 0.4.2.1-alpha):
- On abort, try harder to flush the output buffers of log messages.
On some platforms (macOS), log messages could be discarded when
the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
- Report the tor version whenever an assertion fails. Previously, we
only reported the Tor version on some crashes, and some non-fatal
assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha):
- When extracting an IPv6 address from a PF-based proxy, verify that
we are actually configured to receive an IPv6 address, and log an
internal error if not. Fixes part of bug 31687; bugfix
on 0.2.3.4-alpha.
o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
- When tor is missing descriptors for some primary entry guards,
make the log message less alarming. It's normal for descriptors to
expire, as long as tor fetches new ones soon after. Fixes bug
31657; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (logging, backport from 0.4.0.2-alpha):
- Avoid logging that we are relaxing a circuit timeout when that
timeout is fixed. Fixes bug 28698; bugfix on 0.2.4.7-alpha.
o Minor bugfixes (logging, backport from 0.4.0.3-alpha):
- Correct a misleading error message when IPv4Only or IPv6Only is
used but the resolved address can not be interpreted as an address
of the specified IP version. Fixes bug 13221; bugfix on
0.2.3.9-alpha. Patch from Kris Katterjohn.
- Log the correct port number for listening sockets when "auto" is
used to let Tor pick the port number. Previously, port 0 was
logged instead of the actual port number. Fixes bug 29144; bugfix
on 0.3.5.1-alpha. Patch from Kris Katterjohn.
- Stop logging a BUG() warning when Tor is waiting for exit
descriptors. Fixes bug 28656; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (logging, backport from 0.4.1.1-alpha):
- Do not log a warning when running with an OpenSSL version other
than the one Tor was compiled with, if the two versions should be
compatible. Previously, we would warn whenever the version was
different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.
o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
- Change log level of message "Hash of session info was not as
expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
on 0.1.1.10-alpha.
o Minor bugfixes (logging, backport from 0.4.2.2-alpha):
- Rate-limit the logging message about the obsolete .exit
notation. Previously, there was no limit on this warning, which
could potentially be triggered many times by a hostile website.
Fixes bug 31466; bugfix on 0.2.2.1-alpha.
o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha):
- Do not log a nonfatal assertion failure when receiving a VERSIONS
cell on a connection using the obsolete v1 link protocol. Log a
protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha):
- Reset the periodic events' "enabled" flag when Tor is shut down
cleanly. Previously, this flag was left on, which caused periodic
events not to be re-enabled when Tor was relaunched in-process
with tor_api.h after a shutdown. Fixes bug 32058; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (memory leak, backport from 0.4.1.1-alpha):
- Avoid a minor memory leak that could occur on relays when failing
to create a "keys" directory. Fixes bug 30148; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (memory leak, backport from 0.4.1.4-rc):
- Fix a trivial memory leak when parsing an invalid value
from a download schedule in the configuration. Fixes bug
30894; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (memory management, backport from 0.4.0.3-alpha):
- Refactor the shared random state's memory management so that it
actually takes ownership of the shared random value pointers.
Fixes bug 29706; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (memory management, testing, backport from 0.4.0.3-alpha):
- Stop leaking parts of the shared random state in the shared-random
unit tests. Fixes bug 29599; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (onion services, backport from 0.4.1.1-alpha):
- Avoid a GCC 9.1.1 warning (and possible crash depending on libc
implementation) when failing to load an onion service client
authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (out-of-memory handler, backport from 0.4.1.2-alpha):
- When purging the DNS cache because of an out-of-memory condition,
try purging just the older entries at first. Previously, we would
always purge the whole thing. Fixes bug 29617; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (portability, backport from 0.4.1.2-alpha):
- Avoid crashing in our tor_vasprintf() implementation on systems
that define neither vasprintf() nor _vscprintf(). (This bug has
been here long enough that we question whether people are running
Tor on such systems, but we're applying the fix out of caution.)
Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by
Tobias Stoeckmann.
o Minor bugfixes (relay, backport from 0.4.2.2-alpha):
- Avoid crashing when starting with a corrupt keys directory where
the old ntor key and the new ntor key are identical. Fixes bug
30916; bugfix on 0.2.4.8-alpha.
o Minor bugfixes (rust, backport from 0.4.0.5):
- Abort on panic in all build profiles, instead of potentially
unwinding into C code. Fixes bug 27199; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (rust, backport from 0.4.2.1-alpha):
- Correctly exclude a redundant rust build job in Travis. Fixes bug
31463; bugfix on 0.3.5.4-alpha.
o Minor bugfixes (single onion services, backport from 0.4.0.3-alpha):
- Allow connections to single onion services to remain idle without
being disconnected. Previously, relays acting as rendezvous points
for single onion services were mistakenly closing idle rendezvous
circuits after 60 seconds, thinking that they were unused
directory-fetching circuits that had served their purpose. Fixes
bug 29665; bugfix on 0.2.1.26.
o Minor bugfixes (stats, backport from 0.4.0.3-alpha):
- When ExtraInfoStatistics is 0, stop including PaddingStatistics in
relay and bridge extra-info documents. Fixes bug 29017; bugfix
on 0.3.1.1-alpha.
o Minor bugfixes (testing, backport from 0.4.0.3-alpha):
- Downgrade some LOG_ERR messages in the address/* tests to
warnings. The LOG_ERR messages were occurring when we had no
configured network. We were failing the unit tests, because we
backported 28668 to 0.3.5.8, but did not backport 29530. Fixes bug
29530; bugfix on 0.3.5.8.
- Fix our gcov wrapper script to look for object files at the
correct locations. Fixes bug 29435; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (testing, backport from 0.4.0.4-rc):
- Backport the 0.3.4 src/test/test-network.sh to 0.2.9. We need a
recent test-network.sh to use new chutney features in CI. Fixes
bug 29703; bugfix on 0.2.9.1-alpha.
- Fix a test failure on Windows caused by an unexpected "BUG"
warning in our tests for tor_gmtime_r(-1). Fixes bug 29922; bugfix
on 0.2.9.3-alpha.
o Minor bugfixes (testing, backport from 0.4.2.3-alpha):
- When testing port rebinding, don't busy-wait for tor to log.
Instead, actually sleep for a short time before polling again.
Also improve the formatting of control commands and log messages.
Fixes bug 31837; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (TLS protocol, backport form 0.4.0.4-rc):
- When classifying a client's selection of TLS ciphers, if the
client ciphers are not yet available, do not cache the result.
Previously, we had cached the unavailability of the cipher list
and never looked again, which in turn led us to assume that the
client only supported the ancient V1 link protocol. This, in turn,
was causing Stem integration tests to stall in some cases. Fixes
bug 30021; bugfix on 0.2.4.8-alpha.
o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha):
- Log bugs about the TLS read buffer's length only once, rather than
filling the logs with similar warnings. Fixes bug 31939; bugfix
on 0.3.0.4-rc.
o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
- Always retry v2 single onion service intro and rend circuits with
a 3-hop path. Previously, v2 single onion services used a 3-hop
path when rendezvous circuits were retried after a remote or
delayed failure, but a 1-hop path for immediate retries. Fixes bug
23818; bugfix on 0.2.9.3-alpha.
- Make v3 single onion services fall back to a 3-hop intro, when all
intro points are unreachable via a 1-hop path. Previously, v3
single onion services failed when all intro nodes were unreachable
via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (Windows, CI, backport from 0.4.0.3-alpha):
- Skip the Appveyor 32-bit Windows Server 2016 job, and 64-bit
Windows Server 2012 R2 job. The remaining 2 jobs still provide
coverage of 64/32-bit, and Windows Server 2016/2012 R2. Also set
fast_finish, so failed jobs terminate the build immediately. Fixes
bug 29601; bugfix on 0.3.5.4-alpha.
o Documentation (backport from 0.4.2.1-alpha):
- Use RFC 2397 data URL scheme to embed an image into tor-exit-
notice.html so that operators no longer have to host it
themselves. Closes ticket 31089.
o Testing (backport from 0.4.1.2-alpha):
- Specify torrc paths (with empty files) when launching tor in
integration tests; refrain from reading user and system torrcs.
Resolves issue 29702.
o Testing (continuous integration, backport from 0.4.1.1-alpha):
- In Travis, show stem's tor log after failure. Closes ticket 30234.
o Testing (continuous integration, backport from 0.4.1.5):
- In Travis, make stem log a controller trace to the console, and
tail stem's tor log after failure. Closes ticket 30591.
- In Travis, only run the stem tests that use a tor binary. Closes
ticket 30694.
o Testing (continuous integration, backport from 0.4.2.3-alpha):
- Disable all but one Travis CI macOS build, to mitigate slow
scheduling of Travis macOS jobs. Closes ticket 32177.
- Run the chutney IPv6 networks as part of Travis CI. Closes
ticket 30860.
- Simplify the Travis CI build matrix, and optimise for build time.
Closes ticket 31859.
- Use Windows Server 2019 instead of Windows Server 2016 in our
Appveyor builds. Closes ticket 32086.
o Testing (continuous integration, backport from 0.4.2.4-rc):
- Use Ubuntu Bionic images for our Travis CI builds, so we can get a
recent version of coccinelle. But leave chutney on Ubuntu Trusty,
until we can fix some Bionic permissions issues (see ticket
32240). Related to ticket 31919.
- Install the mingw OpenSSL package in Appveyor. This makes sure
that the OpenSSL headers and libraries match in Tor's Appveyor
builds. (This bug was triggered by an Appveyor image update.)
Fixes bug 32449; bugfix on 0.3.5.6-rc.
- In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
o Testing (continuous integration, backport from 0.4.2.5):
- Require C99 standards-conforming code in Travis CI, but allow GNU gcc
extensions. Also activates clang's -Wtypedef-redefinition warnings.
Build some jobs with -std=gnu99, and some jobs without.
Closes ticket 32500.
Changes in version 0.4.2.4-rc - 2019-11-15
Tor 0.4.2.4-rc is the first release candidate in its series. It fixes
several bugs from earlier versions, including a few that would result in
stack traces or incorrect behavior.
o Minor features (build system):
- Make pkg-config use --prefix when cross-compiling, if
PKG_CONFIG_PATH is not set. Closes ticket 32191.
o Minor features (geoip):
- Update geoip and geoip6 to the November 6 2019 Maxmind GeoLite2
Country database. Closes ticket 32440.
o Minor bugfixes (client, onion service v3):
- Fix a BUG() assertion that occurs within a very small race window
between when a client intro circuit opens and when its descriptor
gets cleaned up from the cache. The circuit is now closed early,
which will trigger a re-fetch of the descriptor and continue the
connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (code quality):
- Fix "make check-includes" so it runs correctly on out-of-tree
builds. Fixes bug 31335; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (configuration):
- Log the option name when skipping an obsolete option. Fixes bug
32295; bugfix on 0.4.2.1-alpha.
o Minor bugfixes (crash):
- When running Tor with an option like --verify-config or
--dump-config that does not start the event loop, avoid crashing
if we try to exit early because of an error. Fixes bug 32407;
bugfix on 0.3.3.1-alpha.
o Minor bugfixes (directory):
- When checking if a directory connection is anonymous, test if the
circuit was marked for close before looking at its channel. This
avoids a BUG() stacktrace if the circuit was previously closed.
Fixes bug 31958; bugfix on 0.4.2.1-alpha.
o Minor bugfixes (shellcheck):
- Fix minor shellcheck errors in the git-*.sh scripts. Fixes bug
32402; bugfix on 0.4.2.1-alpha.
- Start checking most scripts for shellcheck errors again. Fixes bug
32402; bugfix on 0.4.2.1-alpha.
o Testing (continuous integration):
- Use Ubuntu Bionic images for our Travis CI builds, so we can get a
recent version of coccinelle. But leave chutney on Ubuntu Trusty,
until we can fix some Bionic permissions issues (see ticket
32240). Related to ticket 31919.
- Install the mingw OpenSSL package in Appveyor. This makes sure
that the OpenSSL headers and libraries match in Tor's Appveyor
builds. (This bug was triggered by an Appveyor image update.)
Fixes bug 32449; bugfix on 0.3.5.6-rc.
- In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
Changes in version 0.4.2.3-alpha - 2019-10-24
This release fixes several bugs from the previous alpha release, and
from earlier versions of Tor.
o Major bugfixes (relay):
- Relays now respect their AccountingMax bandwidth again. When
relays entered "soft" hibernation (which typically starts when
we've hit 90% of our AccountingMax), we had stopped checking
whether we should enter hard hibernation. Soft hibernation refuses
new connections and new circuits, but the existing circuits can
continue, meaning that relays could have exceeded their configured
AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.
o Major bugfixes (v3 onion services):
- Onion services now always use the exact number of intro points
configured with the HiddenServiceNumIntroductionPoints option (or
fewer if nodes are excluded). Before, a service could sometimes
pick more intro points than configured. Fixes bug 31548; bugfix
on 0.3.2.1-alpha.
o Minor feature (onion services, control port):
- The ADD_ONION command's keyword "BEST" now defaults to ED25519-V3
(v3) onion services. Previously it defaulted to RSA1024 (v2).
Closes ticket 29669.
o Minor features (testing):
- When running tests that attempt to look up hostnames, replace the
libc name lookup functions with ones that do not actually touch
the network. This way, the tests complete more quickly in the
presence of a slow or missing DNS resolver. Closes ticket 31841.
o Minor features (testing, continuous integration):
- Disable all but one Travis CI macOS build, to mitigate slow
scheduling of Travis macOS jobs. Closes ticket 32177.
- Run the chutney IPv6 networks as part of Travis CI. Closes
ticket 30860.
- Simplify the Travis CI build matrix, and optimise for build time.
Closes ticket 31859.
- Use Windows Server 2019 instead of Windows Server 2016 in our
Appveyor builds. Closes ticket 32086.
o Minor bugfixes (build system):
- Interpret "--disable-module-dirauth=no" correctly. Fixes bug
32124; bugfix on 0.3.4.1-alpha.
- Interpret "--with-tcmalloc=no" correctly. Fixes bug 32124; bugfix
on 0.2.0.20-rc.
- Stop failing when jemalloc is requested, but tcmalloc is not
found. Fixes bug 32124; bugfix on 0.3.5.1-alpha.
- When pkg-config is not installed, or a library that depends on
pkg-config is not found, tell the user what to do to fix the
problem. Fixes bug 31922; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (connections):
- Avoid trying to read data from closed connections, which can cause
needless loops in Libevent and infinite loops in Shadow. Fixes bug
30344; bugfix on 0.1.1.1-alpha.
o Minor bugfixes (error handling):
- Always lock the backtrace buffer before it is used. Fixes bug
31734; bugfix on 0.2.5.3-alpha.
o Minor bugfixes (mainloop, periodic events, in-process API):
- Reset the periodic events' "enabled" flag when Tor is shut down
cleanly. Previously, this flag was left on, which caused periodic
events not to be re-enabled when Tor was relaunched in-process
with tor_api.h after a shutdown. Fixes bug 32058; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (process management):
- Remove overly strict assertions that triggered when a pluggable
transport failed to launch. Fixes bug 31091; bugfix
on 0.4.0.1-alpha.
- Remove an assertion in the Unix process backend. This assertion
would trigger when we failed to find the executable for a child
process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (testing):
- Avoid intermittent test failures due to a test that had relied on
inconsistent timing sources. Fixes bug 31995; bugfix
on 0.3.1.3-alpha.
- When testing port rebinding, don't busy-wait for tor to log.
Instead, actually sleep for a short time before polling again.
Also improve the formatting of control commands and log messages.
Fixes bug 31837; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (tls, logging):
- Log bugs about the TLS read buffer's length only once, rather than
filling the logs with similar warnings. Fixes bug 31939; bugfix
on 0.3.0.4-rc.
o Minor bugfixes (v3 onion services):
- Fix an implicit conversion from ssize_t to size_t discovered by
Coverity. Fixes bug 31682; bugfix on 0.4.2.1-alpha.
- Fix a memory leak in an unlikely error code path when encoding HS
DoS establish intro extension cell. Fixes bug 32063; bugfix
on 0.4.2.1-alpha.
- When cleaning up intro circuits for a v3 onion service, don't
remove circuits that have an established or pending circuit, even
if they ran out of retries. This way, we don't remove a circuit on
its last retry. Fixes bug 31652; bugfix on 0.3.2.1-alpha.
o Documentation:
- Correct the description of "GuardLifetime". Fixes bug 31189;
bugfix on 0.3.0.1-alpha.
- Make clear in the man page, in both the bandwidth section and the
AccountingMax section, that Tor counts in powers of two, not
powers of ten: 1 GByte is 1024*1024*1024 bytes, not one billion
bytes. Resolves ticket 32106.
Changes in version 0.4.2.2-alpha - 2019-10-07
This release fixes several bugs from the previous alpha release, and
from earlier versions. It also includes a change in authorities, so
that they begin to reject the currently unsupported release series.
o Major features (directory authorities):
- Directory authorities now reject relays running all currently
deprecated release series. The currently supported release series
are: 0.2.9, 0.3.5, 0.4.0, 0.4.1, and 0.4.2. Closes ticket 31549.
o Major bugfixes (embedded Tor):
- Avoid a possible crash when restarting Tor in embedded mode and
enabling a different set of publish/subscribe messages. Fixes bug
31898; bugfix on 0.4.1.1-alpha.
o Major bugfixes (torrc parsing):
- Stop ignoring torrc options after an %include directive, when the
included directory ends with a file that does not contain any
config options (but does contain comments or whitespace). Fixes
bug 31408; bugfix on 0.3.1.1-alpha.
o Minor features (auto-formatting scripts):
- When annotating C macros, never generate a line that our check-
spaces script would reject. Closes ticket 31759.
- When annotating C macros, try to remove cases of double-negation.
Closes ticket 31779.
o Minor features (continuous integration):
- When building on Appveyor and Travis, pass the "-k" flag to make,
so that we are informed of all compilation failures, not just the
first one or two. Closes ticket 31372.
o Minor features (geoip):
- Update geoip and geoip6 to the October 1 2019 Maxmind GeoLite2
Country database. Closes ticket 31931.
o Minor features (maintenance scripts):
- Add a Coccinelle script to detect bugs caused by incrementing or
decrementing a variable inside a call to log_debug(). Since
log_debug() is a macro whose arguments are conditionally
evaluated, it is usually an error to do this. One such bug was
30628, in which SENDME cells were miscounted by a decrement
operator inside a log_debug() call. Closes ticket 30743.
o Minor features (onion services v3):
- Assist users who try to setup v2 client authorization in v3 onion
services by pointing them to the right documentation. Closes
ticket 28966.
o Minor bugfixes (Appveyor continuous integration):
- Avoid spurious errors when Appveyor CI fails before the install
step. Fixes bug 31884; bugfix on 0.3.4.2-alpha.
o Minor bugfixes (best practices tracker):
- When listing overbroad exceptions, do not also list problems, and
do not list insufficiently broad exceptions. Fixes bug 31338;
bugfix on 0.4.2.1-alpha.
o Minor bugfixes (controller protocol):
- Fix the MAPADDRESS controller command to accept one or more
arguments. Previously, it required two or more arguments, and
ignored the first. Fixes bug 31772; bugfix on 0.4.1.1-alpha.
o Minor bugfixes (logging):
- Add a missing check for HAVE_PTHREAD_H, because the backtrace code
uses mutexes. Fixes bug 31614; bugfix on 0.2.5.2-alpha.
- Disable backtrace signal handlers when shutting down tor. Fixes
bug 31614; bugfix on 0.2.5.2-alpha.
- Rate-limit the logging message about the obsolete .exit
notation. Previously, there was no limit on this warning, which
could potentially be triggered many times by a hostile website.
Fixes bug 31466; bugfix on 0.2.2.1-alpha.
- When initialising log domain masks, only set known log domains.
Fixes bug 31854; bugfix on 0.2.1.1-alpha.
o Minor bugfixes (logging, protocol violations):
- Do not log a nonfatal assertion failure when receiving a VERSIONS
cell on a connection using the obsolete v1 link protocol. Log a
protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
o Minor bugfixes (modules):
- Explain what the optional Directory Authority module is, and what
happens when it is disabled. Fixes bug 31825; bugfix
on 0.3.4.1-alpha.
o Minor bugfixes (multithreading):
- Avoid some undefined behaviour when freeing mutexes. Fixes bug
31736; bugfix on 0.0.7.
o Minor bugfixes (relay):
- Avoid crashing when starting with a corrupt keys directory where
the old ntor key and the new ntor key are identical. Fixes bug
30916; bugfix on 0.2.4.8-alpha.
o Minor bugfixes (tests, SunOS):
- Avoid a map_anon_nofork test failure due to a signed/unsigned
integer comparison. Fixes bug 31897; bugfix on 0.4.1.1-alpha.
o Code simplification and refactoring:
- Refactor connection_control_process_inbuf() to reduce the size of
a practracker exception. Closes ticket 31840.
- Refactor the microdescs_parse_from_string() function into smaller
pieces, for better comprehensibility. Closes ticket 31675.
- Use SEVERITY_MASK_IDX() to find the LOG_* mask indexes in the unit
tests and fuzzers, rather than using hard-coded values. Closes
ticket 31334.
- Interface for function `decrypt_desc_layer` cleaned up. Closes
ticket 31589.
o Documentation:
- Document the signal-safe logging behaviour in the tor man page.
Also add some comments to the relevant functions. Closes
ticket 31839.
- Explain why we can't destroy the backtrace buffer mutex. Explain
why we don't need to destroy the log mutex. Closes ticket 31736.
- The Tor source code repository now includes a (somewhat dated)
description of Tor's modular architecture, in doc/HACKING/design.
This is based on the old "tor-guts.git" repository, which we are
adopting and superseding. Closes ticket 31849.
Changes in version 0.4.1.6 - 2019-09-19
This release backports several bugfixes to improve stability and
correctness. Anyone experiencing build problems or crashes with 0.4.1.5,
or experiencing reliability issues with single onion services, should
upgrade.
o Major bugfixes (crash, Linux, Android, backport from 0.4.2.1-alpha):
- Tolerate systems (including some Android installations) where
madvise and MADV_DONTDUMP are available at build-time, but not at
run time. Previously, these systems would notice a failed syscall
and abort. Fixes bug 31570; bugfix on 0.4.1.1-alpha.
- Tolerate systems (including some Linux installations) where
madvise and/or MADV_DONTFORK are available at build-time, but not
at run time. Previously, these systems would notice a failed
syscall and abort. Fixes bug 31696; bugfix on 0.4.1.1-alpha.
o Minor features (stem tests, backport from 0.4.2.1-alpha):
- Change "make test-stem" so it only runs the stem tests that use
tor. This change makes test-stem faster and more reliable. Closes
ticket 31554.
o Minor bugfixes (build system, backport form 0.4.2.1-alpha):
- Do not include the deprecated <sys/sysctl.h> on Linux or Windows
systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
o Minor bugfixes (compilation, backport from 0.4.2.1-alpha):
- Add more stub functions to fix compilation on Android with link-
time optimization when --disable-module-dirauth is used.
Previously, these compilation settings would make the compiler
look for functions that didn't exist. Fixes bug 31552; bugfix
on 0.4.1.1-alpha.
- Suppress spurious float-conversion warnings from GCC when calling
floating-point classifier functions on FreeBSD. Fixes part of bug
31687; bugfix on 0.3.1.5-alpha.
o Minor bugfixes (controller protocol):
- Fix the MAPADDRESS controller command to accept one or more
arguments. Previously, it required two or more arguments, and ignored
the first. Fixes bug 31772; bugfix on 0.4.1.1-alpha.
o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha):
- When extracting an IPv6 address from a PF-based proxy, verify that
we are actually configured to receive an IPv6 address, and log an
internal error if not. Fixes part of bug 31687; bugfix
on 0.2.3.4-alpha.
o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
- When tor is missing descriptors for some primary entry guards,
make the log message less alarming. It's normal for descriptors to
expire, as long as tor fetches new ones soon after. Fixes bug
31657; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
- Change log level of message "Hash of session info was not as
expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
on 0.1.1.10-alpha.
o Minor bugfixes (rust, backport from 0.4.2.1-alpha):
- Correctly exclude a redundant rust build job in Travis. Fixes bug
31463; bugfix on 0.3.5.4-alpha.
o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
- Always retry v2 single onion service intro and rend circuits with
a 3-hop path. Previously, v2 single onion services used a 3-hop
path when rendezvous circuits were retried after a remote or
delayed failure, but a 1-hop path for immediate retries. Fixes bug
23818; bugfix on 0.2.9.3-alpha.
o Minor bugfixes (v3 single onion services, backport from 0.4.2.1-alpha):
- Always retry v3 single onion service intro and rend circuits with
a 3-hop path. Previously, v3 single onion services used a 3-hop
path when rend circuits were retried after a remote or delayed
failure, but a 1-hop path for immediate retries. Fixes bug 23818;
bugfix on 0.3.2.1-alpha.
- Make v3 single onion services fall back to a 3-hop intro, when all
intro points are unreachable via a 1-hop path. Previously, v3
single onion services failed when all intro nodes were unreachable
via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
o Documentation (backport from 0.4.2.1-alpha):
- Use RFC 2397 data URL scheme to embed an image into tor-exit-
notice.html so that operators no longer have to host it
themselves. Closes ticket 31089.
Changes in version 0.4.2.1-alpha - 2019-09-17
This is the first alpha release in the 0.4.2.x series. It adds new
defenses for denial-of-service attacks against onion services. It also
includes numerous kinds of bugfixes and refactoring to help improve
Tor's stability and ease of development.
o Major features (onion service v3, denial of service):
- Add onion service introduction denial of service defenses. Intro
points can now rate-limit client introduction requests, using
parameters that can be sent by the service within the
ESTABLISH_INTRO cell. If the cell extension for this is not used,
the intro point will honor the consensus parameters. Closes
ticket 30924.
o Major bugfixes (circuit build, guard):
- When considering upgrading circuits from "waiting for guard" to
"open", always ignore circuits that are marked for close.
Previously we could end up in the situation where a subsystem is
notified of a circuit opening, but the circuit is still marked for
close, leading to undesirable behavior. Fixes bug 30871; bugfix
on 0.3.0.1-alpha.
o Major bugfixes (crash, Linux, Android):
- Tolerate systems (including some Android installations) where
madvise and MADV_DONTDUMP are available at build-time, but not at
run time. Previously, these systems would notice a failed syscall
and abort. Fixes bug 31570; bugfix on 0.4.1.1-alpha.
- Tolerate systems (including some Linux installations) where
madvise and/or MADV_DONTFORK are available at build-time, but not
at run time. Previously, these systems would notice a failed
syscall and abort. Fixes bug 31696; bugfix on 0.4.1.1-alpha.
o Minor features (best practices tracker):
- Our best-practices tracker now integrates with our include-checker
tool to keep track of how many layering violations we have not yet
fixed. We hope to reduce this number over time to improve Tor's
modularity. Closes ticket 31176.
- Add a TOR_PRACTRACKER_OPTIONS variable for passing arguments to
practracker from the environment. We may want this for continuous
integration. Closes ticket 31309.
- Give a warning rather than an error when a practracker exception
is violated by a small amount, add a --list-overbroad option to
practracker that lists exceptions that are stricter than they need
to be, and provide an environment variable for disabling
practracker. Closes ticket 30752.
- Our best-practices tracker now looks at headers as well as C
files. Closes ticket 31175.
o Minor features (build system):
- Add --disable-manpage and --disable-html-manual options to
configure script. This will enable shortening build times by not
building documentation. Resolves issue 19381.
o Minor features (compilation):
- Log a more useful error message when we are compiling and one of
the compile-time hardening options we have selected can be linked
but not executed. Closes ticket 27530.
o Minor features (configuration):
- The configuration code has been extended to allow splitting
configuration data across multiple objects. Previously, all
configuration data needed to be kept in a single object, which
tended to become bloated. Closes ticket 31240.
o Minor features (continuous integration):
- When running CI builds on Travis, put some random data in
~/.torrc, to make sure no tests are reading the Tor configuration
file from its default location. Resolves issue 30102.
o Minor features (debugging):
- Log a nonfatal assertion failure if we encounter a configuration
line whose command is "CLEAR" but which has a nonempty value. This
should be impossible, according to the rules of our configuration
line parsing. Closes ticket 31529.
o Minor features (git hooks):
- Our pre-commit git hook now checks for a special file before
running practracker, so that practracker only runs on branches
that are based on master. Since the pre-push hook calls the pre-
commit hook, practracker will also only run before pushes of
branches based on master. Closes ticket 30979.
o Minor features (git scripts):
- Add a "--" command-line argument, to separate git-push-all.sh
script arguments from arguments that are passed through to git
push. Closes ticket 31314.
- Add a -r <remote-name> argument to git-push-all.sh, so the script
can push test branches to a personal remote. Closes ticket 31314.
- Add a -t <test-branch-prefix> argument to git-merge-forward.sh and
git-push-all.sh, which makes these scripts create, merge forward,
and push test branches. Closes ticket 31314.
- Add a -u argument to git-merge-forward.sh, so that the script can
re-use existing test branches after a merge failure and fix.
Closes ticket 31314.
- Add a TOR_GIT_PUSH env var, which sets the default git push
command and arguments for git-push-all.sh. Closes ticket 31314.
- Add a TOR_PUSH_DELAY variable to git-push-all.sh, which makes the
script push master and maint branches with a delay between each
branch. These delays trigger the CI jobs in a set order, which
should show the most likely failures first. Also make pushes
atomic by default, and make the script pass any command-line
arguments to git push. Closes ticket 29879.
- Call the shellcheck script from the pre-commit hook. Closes
ticket 30967.
- Skip pushing test branches that are the same as a remote
maint/release/master branch in git-push-all.sh by default. Add a
-s argument, so git-push-all.sh can push all test branches. Closes
ticket 31314.
o Minor features (IPv6, logging):
- Log IPv6 addresses as well as IPv4 addresses when describing
routerinfos, routerstatuses, and nodes. Closes ticket 21003.
o Minor features (onion service v3):
- Do not allow single hop clients to fetch or post an HS descriptor
from an HSDir. Closes ticket 24964.
o Minor features (onion service):
- Disallow single-hop clients at the introduction point. We've
removed Tor2web support a while back and single-hop rendezvous
attempts are blocked at the relays. This change should remove load
off the network from spammy clients. Close ticket 24963.
o Minor features (stem tests):
- Change "make test-stem" so it only runs the stem tests that use
tor. This change makes test-stem faster and more reliable. Closes
ticket 31554.
o Minor features (testing):
- Add a script to invoke "tor --dump-config" and "tor
--verify-config" with various configuration options, and see
whether tor's resulting configuration or error messages are what
we expect. Use it for integration testing of our +Option and
/Option flags. Closes ticket 31637.
- Improve test coverage for our existing configuration parsing and
management API. Closes ticket 30893.
- Add integration tests to make sure that practracker gives the
outputs we expect. Closes ticket 31477.
- The practracker self-tests are now run as part of the Tor test
suite. Closes ticket 31304.
o Minor features (token bucket):
- Implement a generic token bucket that uses a single counter, for
use in anti-DoS onion service work. Closes ticket 30687.
o Minor bugfixes (best practices tracker):
- Fix a few issues in the best-practices script, including tests,
tab tolerance, error reporting, and directory-exclusion logic.
Fixes bug 29746; bugfix on 0.4.1.1-alpha.
- When running check-best-practices, only consider files in the src
subdirectory. Previously we had recursively considered all
subdirectories, which made us get confused by the temporary
directories made by "make distcheck". Fixes bug 31578; bugfix
on 0.4.1.1-alpha.
o Minor bugfixes (build system):
- Do not include the deprecated <sys/sysctl.h> on Linux or Windows
systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
o Minor bugfixes (chutney, makefiles, documentation):
- "make test-network-all" now shows the warnings from each test-
network.sh run on the console, so developers see new warnings
early. We've also improved the documentation for this feature, and
renamed a Makefile variable so the code is self-documenting. Fixes
bug 30455; bugfix on 0.3.0.4-rc.
o Minor bugfixes (compilation):
- Add more stub functions to fix compilation on Android with link-
time optimization when --disable-module-dirauth is used.
Previously, these compilation settings would make the compiler
look for functions that didn't exist. Fixes bug 31552; bugfix
on 0.4.1.1-alpha.
- Suppress spurious float-conversion warnings from GCC when calling
floating-point classifier functions on FreeBSD. Fixes part of bug
31687; bugfix on 0.3.1.5-alpha.
o Minor bugfixes (configuration):
- Invalid floating-point values in the configuration file are now
treated as errors in the configuration. Previously, they were
ignored and treated as zero. Fixes bug 31475; bugfix on 0.0.1.
o Minor bugfixes (coverity):
- Add an assertion when parsing a BEGIN cell so that coverity can be
sure that we are not about to dereference a NULL address. Fixes
bug 31026; bugfix on 0.2.4.7-alpha. This is CID 1447296.
- In our siphash implementation, when building for coverity, use
memcpy in place of a switch statement, so that coverity can tell
we are not accessing out-of-bounds memory. Fixes bug 31025; bugfix
on 0.2.8.1-alpha. This is tracked as CID 1447293 and 1447295.
- Fix several coverity warnings from our unit tests. Fixes bug
31030; bugfix on 0.2.4.1-alpha, 0.3.2.1-alpha, and 0.4.0.1-alpha.
o Minor bugfixes (developer tooling):
- Only log git script changes in the post-merge script when the
merge was to the master branch. Fixes bug 31040; bugfix
on 0.4.1.1-alpha.
o Minor bugfixes (directory authorities):
- Return a distinct status when formatting annotations fails. Fixes
bug 30780; bugfix on 0.2.0.8-alpha.
o Minor bugfixes (error handling):
- On abort, try harder to flush the output buffers of log messages.
On some platforms (macOS), log messages could be discarded when
the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
- Report the tor version whenever an assertion fails. Previously, we
only reported the Tor version on some crashes, and some non-fatal
assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
- When tor aborts due to an error, close log file descriptors before
aborting. Closing the logs makes some OSes flush log file buffers,
rather than deleting buffered log lines. Fixes bug 31594; bugfix
on 0.2.5.2-alpha.
o Minor bugfixes (FreeBSD, PF-based proxy, IPv6):
- When extracting an IPv6 address from a PF-based proxy, verify that
we are actually configured to receive an IPv6 address, and log an
internal error if not. Fixes part of bug 31687; bugfix
on 0.2.3.4-alpha.
o Minor bugfixes (git hooks):
- Remove a duplicate call to practracker from the pre-push hook. The
pre-push hook already calls the pre-commit hook, which calls
practracker. Fixes bug 31462; bugfix on 0.4.1.1-alpha.
o Minor bugfixes (git scripts):
- Stop hard-coding the bash path in the git scripts. Some OSes don't
have bash in /usr/bin, others have an ancient bash at this path.
Fixes bug 30840; bugfix on 0.4.0.1-alpha.
- Stop hard-coding the tor master branch name and worktree path in
the git scripts. Fixes bug 30841; bugfix on 0.4.0.1-alpha.
- Allow git-push-all.sh to be run from any directory. Previously,
the script only worked if run from an upstream worktree directory.
Closes ticket 31678.
o Minor bugfixes (guards):
- When tor is missing descriptors for some primary entry guards,
make the log message less alarming. It's normal for descriptors to
expire, as long as tor fetches new ones soon after. Fixes bug
31657; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (ipv6):
- Check for private IPv6 addresses alongside their IPv4 equivalents
when authorities check descriptors. Previously, we only checked
for private IPv4 addresses. Fixes bug 31088; bugfix on
0.2.3.21-rc. Patch by Neel Chauhan.
- When parsing microdescriptors, we should check the IPv6 exit
policy alongside IPv4. Previously, we checked both exit policies
for only router info structures, while microdescriptors were
IPv4-only. Fixes bug 27284; bugfix on 0.2.3.1-alpha. Patch by
Neel Chauhan.
o Minor bugfixes (logging):
- Change log level of message "Hash of session info was not as
expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
on 0.1.1.10-alpha.
- Fix a code issue that would have broken our parsing of log domains
as soon as we had 33 of them. Fortunately, we still only have 29.
Fixes bug 31451; bugfix on 0.4.1.4-rc.
o Minor bugfixes (memory management):
- Stop leaking a small amount of memory in nt_service_install(), in
unreachable code. Fixes bug 30799; bugfix on 0.2.0.7-alpha. Patch
by Xiaoyin Liu.
o Minor bugfixes (networking, IP addresses):
- When parsing addresses via Tor's internal DNS lookup API, reject
IPv4 addresses in square brackets, and accept IPv6 addresses in
square brackets. This change completes the work started in 23082,
making address parsing consistent between tor's internal DNS
lookup and address parsing APIs. Fixes bug 30721; bugfix
on 0.2.1.5-alpha.
- When parsing addresses via Tor's internal address:port parsing and
DNS lookup APIs, require IPv6 addresses with ports to have square
brackets. But allow IPv6 addresses without ports, whether or not
they have square brackets. Fixes bug 30721; bugfix
on 0.2.1.5-alpha.
o Minor bugfixes (onion service v3):
- When purging the client descriptor cache, close any introduction
point circuits associated with purged cache entries. This avoids
picking those circuits later when connecting to the same
introduction points. Fixes bug 30921; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (onion services):
- In the hs_ident_circuit_t data structure, remove the unused field
circuit_type and the respective argument in hs_ident_circuit_new().
This field was set by clients (for introduction) and services (for
introduction and rendezvous) but was never used afterwards. Fixes
bug 31490; bugfix on 0.3.2.1-alpha. Patch by Neel Chauhan.
o Minor bugfixes (operator tools):
- Make tor-print-ed-signing-cert(1) print certificate expiration
date in RFC 1123 and UNIX timestamp formats, to make output
machine readable. Fixes bug 31012; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (rust):
- Correctly exclude a redundant rust build job in Travis. Fixes bug
31463; bugfix on 0.3.5.4-alpha.
- Raise the minimum rustc version to 1.31.0, as checked by configure
and CI. Fixes bug 31442; bugfix on 0.3.5.4-alpha.
o Minor bugfixes (sendme, code structure):
- Rename the trunnel SENDME file definition from sendme.trunnel to
sendme_cell.trunnel to avoid having twice sendme.{c|h} in the
repository. Fixes bug 30769; bugfix on 0.4.1.1-alpha.
o Minor bugfixes (statistics):
- Stop removing the ed25519 signature if the extra info file is too
big. If the signature data was removed, but the keyword was kept,
this could result in an unparseable extra info file. Fixes bug
30958; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (subsystems):
- Make the subsystem init order match the subsystem module
dependencies. Call windows process security APIs as early as
possible. Initialize logging before network and time, so that
network and time can use logging. Fixes bug 31615; bugfix
on 0.4.0.1-alpha.
o Minor bugfixes (testing):
- Teach the util/socketpair_ersatz test to work correctly when we
have no network stack configured. Fixes bug 30804; bugfix
on 0.2.5.1-alpha.
o Minor bugfixes (v2 single onion services):
- Always retry v2 single onion service intro and rend circuits with
a 3-hop path. Previously, v2 single onion services used a 3-hop
path when rendezvous circuits were retried after a remote or
delayed failure, but a 1-hop path for immediate retries. Fixes bug
23818; bugfix on 0.2.9.3-alpha.
o Minor bugfixes (v3 single onion services):
- Always retry v3 single onion service intro and rend circuits with
a 3-hop path. Previously, v3 single onion services used a 3-hop
path when rend circuits were retried after a remote or delayed
failure, but a 1-hop path for immediate retries. Fixes bug 23818;
bugfix on 0.3.2.1-alpha.
- Make v3 single onion services fall back to a 3-hop intro, when all
intro points are unreachable via a 1-hop path. Previously, v3
single onion services failed when all intro nodes were unreachable
via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
o Documentation:
- Improve documentation in circuit padding subsystem. Patch by
Tobias Pulls. Closes ticket 31113.
- Include an example usage for IPv6 ORPort in our sample torrc.
Closes ticket 31320; patch from Ali Raheem.
- Use RFC 2397 data URL scheme to embed an image into tor-exit-
notice.html so that operators no longer have to host it
themselves. Closes ticket 31089.
o Removed features:
- No longer include recommended package digests in votes as detailed
in proposal 301. The RecommendedPackages torrc option is
deprecated and will no longer have any effect. "package" lines
will still be considered when computing consensuses for consensus
methods that include them. (This change has no effect on the list
of recommended Tor versions, which is still in use.) Closes
ticket 29738.
- Remove torctl.in from contrib/dist directory. Resolves
ticket 30550.
o Testing:
- Run shellcheck for all non-third-party shell scripts that are
shipped with Tor. Closes ticket 29533.
- When checking shell scripts, ignore any user-created directories.
Closes ticket 30967.
o Code simplification and refactoring (config handling):
- Extract our variable manipulation code from confparse.c to a new
lower-level typedvar.h module. Closes ticket 30864.
- Lower another layer of object management from confparse.c to a
more general tool. Now typed structure members are accessible via
an abstract type. Implements ticket 30914.
- Move our backend logic for working with configuration and state
files into a lower-level library, since it no longer depends on
any tor-specific functionality. Closes ticket 31626.
- Numerous simplifications in configuration-handling logic: remove
duplicated macro definitions, replace magical names with flags,
and refactor "TestingTorNetwork" to use the same default-option
logic as the rest of Tor. Closes ticket 30935.
- Replace our ad-hoc set of flags for configuration variables and
configuration variable types with fine-grained orthogonal flags
corresponding to the actual behavior we want. Closes ticket 31625.
o Code simplification and refactoring (misc):
- Eliminate some uses of lower-level control reply abstractions,
primarily in the onion_helper functions. Closes ticket 30889.
- Rework bootstrap tracking to use the new publish-subscribe
subsystem. Closes ticket 29976.
- Rewrite format_node_description() and router_get_verbose_nickname()
to use strlcpy() and strlcat(). The previous implementation used
memcpy() and pointer arithmetic, which was error-prone. Closes
ticket 31545. This is CID 1452819.
- Split extrainfo_dump_to_string() into smaller functions. Closes
ticket 30956.
- Use the ptrdiff_t type consistently for expressing variable
offsets and pointer differences. Previously we incorrectly (but
harmlessly) used int and sometimes off_t for these cases. Closes
ticket 31532.
- Use the subsystems mechanism to manage the main event loop code.
Closes ticket 30806.
- Various simplifications and minor improvements to the circuit
padding machines. Patch by Tobias Pulls. Closes tickets 31112
and 31098.
o Documentation (hard-coded directories):
- Improve the documentation for the DirAuthority and FallbackDir
torrc options. Closes ticket 30955.
o Documentation (tor.1 man page):
- Fix typo in tor.1 man page: the option is "--help", not "-help".
Fixes bug 31008; bugfix on 0.2.2.9-alpha.
Changes in version 0.4.1.5 - 2019-08-20
This is the first stable release in the 0.4.1.x series. This series
adds experimental circuit-level padding, authenticated SENDME cells to
defend against certain attacks, and several performance improvements
to save on CPU consumption. It fixes bugs in bootstrapping and v3
onion services. It also includes numerous smaller features and
bugfixes on earlier versions.
Per our support policy, we will support the 0.4.1.x series for nine
months, or until three months after the release of a stable 0.4.2.x:
whichever is longer. If you need longer-term support, please stick
with 0.3.5.x, which will we plan to support until Feb 2022.
Below are the changes since 0.4.1.4-rc. For a complete list of changes
since 0.4.0.5, see the ReleaseNotes file.
o Directory authority changes:
- The directory authority "dizum" has a new IP address. Closes
ticket 31406.
o Minor features (circuit padding logging):
- Demote noisy client-side warn logs about circuit padding to
protocol warnings. Add additional log messages and circuit ID
fields to help with bug 30992 and any other future issues.
o Minor bugfixes (circuit padding negotiation):
- Bump the circuit padding protocol version to explicitly signify
that the HS setup machine support is finalized in 0.4.1.x-stable.
This also means that 0.4.1.x-alpha clients will not negotiate
padding with 0.4.1.x-stable relays, and 0.4.1.x-stable clients
will not negotiate padding with 0.4.1.x-alpha relays (or 0.4.0.x
relays). Fixes bug 31356; bugfix on 0.4.1.1-alpha.
o Minor bugfixes (circuit padding):
- Ignore non-padding cells on padding circuits. This addresses
various warning messages from subsystems that were not expecting
padding circuits. Fixes bug 30942; bugfix on 0.4.1.1-alpha.
o Minor bugfixes (clock skew detection):
- Don't believe clock skew results from NETINFO cells that appear to
arrive before we sent the VERSIONS cells they are responding to.
Previously, we would accept them up to 3 minutes "in the past".
Fixes bug 31343; bugfix on 0.2.4.4-alpha.
o Minor bugfixes (compatibility, standards compliance):
- Fix a bug that would invoke undefined behavior on certain
operating systems when trying to asprintf() a string exactly
INT_MAX bytes long. We don't believe this is exploitable, but it's
better to fix it anyway. Fixes bug 31001; bugfix on 0.2.2.11-alpha.
Found and fixed by Tobias Stoeckmann.
o Minor bugfixes (compilation warning):
- Fix a compilation warning on Windows about casting a function
pointer for GetTickCount64(). Fixes bug 31374; bugfix
on 0.2.9.1-alpha.
o Minor bugfixes (compilation):
- Avoid using labs() on time_t, which can cause compilation warnings
on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
o Minor bugfixes (distribution):
- Do not ship any temporary files found in the
scripts/maint/practracker directory. Fixes bug 31311; bugfix
on 0.4.1.1-alpha.
o Testing (continuous integration):
- In Travis, make stem log a controller trace to the console, and
tail stem's tor log after failure. Closes ticket 30591.
- In Travis, only run the stem tests that use a tor binary. Closes
ticket 30694.
Changes in version 0.4.1.4-rc - 2019-07-25
Tor 0.4.1.4-rc fixes a few bugs from previous versions of Tor, and
updates to a new list of fallback directories. If no new bugs are
found, the next release in the 0.4.1.x serious should be stable.
o Major bugfixes (circuit build, guard):
- When considering upgrading circuits from "waiting for guard" to
"open", always ignore circuits that are marked for close. Otherwise,
we can end up in the situation where a subsystem is notified that
a closing circuit has just opened, leading to undesirable
behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.
o Minor features (continuous integration):
- Our Travis configuration now uses Chutney to run some network
integration tests automatically. Closes ticket 29280.
o Minor features (fallback directory list):
- Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc
in December 2018 (of which ~122 were still functional), with a
list of 148 fallbacks (70 new, 78 existing, 79 removed) generated
in June 2019. Closes ticket 28795.
o Minor bugfixes (circuit padding):
- On relays, properly check that a padding machine is absent before
logging a warning about it being absent. Fixes bug 30649; bugfix
on 0.4.0.1-alpha.
- Add two NULL checks in unreachable places to silence Coverity (CID
144729 and 1447291) and better future-proof ourselves. Fixes bug
31024; bugfix on 0.4.1.1-alpha.
o Minor bugfixes (crash on exit):
- Avoid a set of possible code paths that could try to use freed
memory in routerlist_free() while Tor was exiting. Fixes bug
31003; bugfix on 0.1.2.2-alpha.
o Minor bugfixes (logging):
- Fix a conflict between the flag used for messaging-domain log
messages, and the LD_NO_MOCK testing flag. Fixes bug 31080; bugfix
on 0.4.1.1-alpha.
o Minor bugfixes (memory leaks):
- Fix a trivial memory leak when parsing an invalid value from a
download schedule in the configuration. Fixes bug 30894; bugfix
on 0.3.4.1-alpha.
o Code simplification and refactoring:
- Remove some dead code from circpad_machine_remove_token() to fix
some Coverity warnings (CID 1447298). Fixes bug 31027; bugfix
on 0.4.1.1-alpha.
Changes in version 0.4.1.3-alpha - 2019-06-25
Tor 0.4.1.3-alpha resolves numerous bugs left over from the previous
alpha, most of them from earlier release series.
o Major bugfixes (Onion service reachability):
- Properly clean up the introduction point map when circuits change
purpose from onion service circuits to pathbias, measurement, or
other circuit types. This should fix some service-side instances
of introduction point failure. Fixes bug 29034; bugfix
on 0.3.2.1-alpha.
o Minor features (geoip):
- Update geoip and geoip6 to the June 10 2019 Maxmind GeoLite2
Country database. Closes ticket 30852.
o Minor features (logging):
- Give a more useful assertion failure message if we think we have
minherit() but we fail to make a region non-inheritable. Give a
compile-time warning if our support for minherit() is incomplete.
Closes ticket 30686.
o Minor bugfixes (circuit isolation):
- Fix a logic error that prevented the SessionGroup sub-option from
being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (continuous integration):
- Allow the test-stem job to fail in Travis, because it sometimes
hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha.
- Skip test_rebind on macOS in Travis, because it is unreliable on
macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
- Skip test_rebind when the TOR_SKIP_TEST_REBIND environment
variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (directory authorities):
- Stop crashing after parsing an unknown descriptor purpose
annotation. We think this bug can only be triggered by modifying a
local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.
o Minor bugfixes (pluggable transports):
- When running as a bridge with pluggable transports, always publish
pluggable transport information in our extrainfo descriptor, even
if ExtraInfoStatistics is 0. This information is needed by
BridgeDB. Fixes bug 30956; bugfix on 0.4.1.1-alpha.
o Documentation:
- Mention URLs for Travis/Appveyor/Jenkins in ReleasingTor.md.
Closes ticket 30630.
Changes in version 0.4.1.2-alpha - 2019-06-06
Tor 0.4.1.2-alpha resolves numerous bugs--some of them from the
previous alpha, and some much older. It also contains minor testing
improvements, and an improvement to the security of our authenticated
SENDME implementation.
o Major bugfixes (bridges):
- Consider our directory information to have changed when our list
of bridges changes. Previously, Tor would not re-compute the
status of its directory information when bridges changed, and
therefore would not realize that it was no longer able to build
circuits. Fixes part of bug 29875.
- Do not count previously configured working bridges towards our
total of working bridges. Previously, when Tor's list of bridges
changed, it would think that the old bridges were still usable,
and delay fetching router descriptors for the new ones. Fixes part
of bug 29875; bugfix on 0.3.0.1-alpha.
o Major bugfixes (flow control, SENDME):
- Decrement the stream-level package window after packaging a cell.
Previously, it was done inside a log_debug() call, meaning that if
debug logs were not enabled, the decrement would never happen, and
thus the window would be out of sync with the other end point.
Fixes bug 30628; bugfix on 0.4.1.1-alpha.
o Major bugfixes (onion service reachability):
- Properly clean up the introduction point map and associated state
when circuits change purpose from onion service circuits to
pathbias, measurement, or other circuit types. This may fix some
instances of introduction point failure. Fixes bug 29034; bugfix
on 0.3.2.1-alpha.
o Minor features (authenticated SENDME):
- Ensure that there is enough randomness on every circuit to prevent
an attacker from successfully predicting the hashes they will need
to include in authenticated SENDME cells. At a random interval, if
we have not sent randomness already, we now leave some extra space
at the end of a cell that we can fill with random bytes. Closes
ticket 26846.
o Minor features (continuous integration):
- When running coverage builds on Travis, we now set
TOR_TEST_RNG_SEED, to avoid RNG-based coverage differences. Part
of ticket 28878.
o Minor features (maintenance):
- Add a new "make autostyle" target that developers can use to apply
all automatic Tor style and consistency conversions to the
codebase. Closes ticket 30539.
o Minor features (testing):
- The circuitpadding tests now use a reproducible RNG implementation,
so that if a test fails, we can learn why. Part of ticket 28878.
- Tor's tests now support an environment variable, TOR_TEST_RNG_SEED,
to set the RNG seed for tests that use a reproducible RNG. Part of
ticket 28878.
- When running tests in coverage mode, take additional care to make
our coverage deterministic, so that we can accurately track
changes in code coverage. Closes ticket 30519.
o Minor bugfixes (configuration, proxies):
- Fix a bug that prevented us from supporting SOCKS5 proxies that
want authentication along with configured (but unused!)
ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.
o Minor bugfixes (controller):
- POSTDESCRIPTOR requests should work again. Previously, they were
broken if a "purpose=" flag was specified. Fixes bug 30580; bugfix
on 0.4.1.1-alpha.
- Repair the HSFETCH command so that it works again. Previously, it
expected a body when it shouldn't have. Fixes bug 30646; bugfix
on 0.4.1.1-alpha.
o Minor bugfixes (developer tooling):
- Fix pre-push hook to allow fixup and squash commits when pushing
to non-upstream git remote. Fixes bug 30286; bugfix
on 0.4.0.1-alpha.
o Minor bugfixes (directory authority):
- Move the "bandwidth-file-headers" line in directory authority
votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (NetBSD):
- Fix usage of minherit() on NetBSD and other platforms that define
MAP_INHERIT_{ZERO,NONE} instead of INHERIT_{ZERO,NONE}. Fixes bug
30614; bugfix on 0.4.0.2-alpha. Patch from Taylor Campbell.
o Minor bugfixes (out-of-memory handler):
- When purging the DNS cache because of an out-of-memory condition,
try purging just the older entries at first. Previously, we would
always purge the whole thing. Fixes bug 29617; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (portability):
- Avoid crashing in our tor_vasprintf() implementation on systems
that define neither vasprintf() nor _vscprintf(). (This bug has
been here long enough that we question whether people are running
Tor on such systems, but we're applying the fix out of caution.)
Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by
Tobias Stoeckmann.
o Minor bugfixes (shutdown, libevent, memory safety):
- Avoid use-after-free bugs when shutting down, by making sure that
we shut down libevent only after shutting down all of its users.
We believe these are harmless in practice, since they only occur
on the shutdown path, and do not involve any attacker-controlled
data. Fixes bug 30629; bugfix on 0.4.1.1-alpha.
o Minor bugfixes (static analysis):
- Fix several spurious Coverity warnings about the unit tests, to
lower our chances of missing real warnings in the future. Fixes
bug 30150; bugfix on 0.3.5.1-alpha and various other Tor versions.
o Testing:
- Specify torrc paths (with empty files) when launching tor in
integration tests; refrain from reading user and system torrcs.
Resolves issue 29702.
Changes in version 0.4.1.1-alpha - 2019-05-22
This is the first alpha in the 0.4.1.x series. It introduces
lightweight circuit padding to make some onion-service circuits harder
to distinguish, includes a new "authenticated SENDME" feature to make
certain denial-of-service attacks more difficult, and improves
performance in several areas.
o Major features (circuit padding):
- Onion service clients now add padding cells at the start of their
INTRODUCE and RENDEZVOUS circuits, to make those circuits' traffic
look more like general purpose Exit traffic. The overhead for this
is 2 extra cells in each direction for RENDEZVOUS circuits, and 1
extra upstream cell and 10 downstream cells for INTRODUCE
circuits. This feature is only enabled when also supported by the
circuit's middle node. (Clients may specify fixed middle nodes
with the MiddleNodes option, and may force-disable this feature
with the CircuitPadding option.) Closes ticket 28634.
o Major features (code organization):
- Tor now includes a generic publish-subscribe message-passing
subsystem that we can use to organize intermodule dependencies. We
hope to use this to reduce dependencies between modules that don't
need to be related, and to generally simplify our codebase. Closes
ticket 28226.
o Major features (controller protocol):
- Controller commands are now parsed using a generalized parsing
subsystem. Previously, each controller command was responsible for
parsing its own input, which led to strange inconsistencies.
Closes ticket 30091.
o Major features (flow control):
- Implement authenticated SENDMEs as detailed in proposal 289. A
SENDME cell now includes the digest of the traffic that it
acknowledges, so that once an end point receives the SENDME, it
can confirm the other side's knowledge of the previous cells that
were sent, and prevent certain types of denial-of-service attacks.
This behavior is controlled by two new consensus parameters: see
the proposal for more details. Fixes ticket 26288.
o Major features (performance):
- Our node selection algorithm now excludes nodes in linear time.
Previously, the algorithm was quadratic, which could slow down
heavily used onion services. Closes ticket 30307.
o Major features (performance, RNG):
- Tor now constructs a fast secure pseudorandom number generator for
each thread, to use when performance is critical. This PRNG is
based on AES-CTR, using a buffering construction similar to
libottery and the (newer) OpenBSD arc4random() code. It
outperforms OpenSSL 1.1.1a's CSPRNG by roughly a factor of 100 for
small outputs. Although we believe it to be cryptographically
strong, we are only using it when necessary for performance.
Implements tickets 29023 and 29536.
o Major bugfixes (onion service v3):
- Fix an unreachable bug in which an introduction point could try to
send an INTRODUCE_ACK with a status code that Trunnel would refuse
to encode, leading the relay to assert(). We've consolidated the
ABI values into Trunnel now. Fixes bug 30454; bugfix
on 0.3.0.1-alpha.
- Clients can now handle unknown status codes from INTRODUCE_ACK
cells. (The NACK behavior will stay the same.) This will allow us
to extend status codes in the future without breaking the normal
client behavior. Fixes another part of bug 30454; bugfix
on 0.3.0.1-alpha.
o Minor features (circuit padding):
- We now use a fast PRNG when scheduling circuit padding. Part of
ticket 28636.
- Allow the padding machine designer to pick the edges of their
histogram instead of trying to compute them automatically using an
exponential formula. Resolves some undefined behavior in the case
of small histograms and allows greater flexibility on machine
design. Closes ticket 29298; bugfix on 0.4.0.1-alpha.
- Allow circuit padding machines to hold a circuit open until they
are done padding it. Closes ticket 28780.
o Minor features (compile-time modules):
- Add a "--list-modules" command to print a list of which compile-
time modules are enabled. Closes ticket 30452.
o Minor features (continuous integration):
- Remove sudo configuration lines from .travis.yml as they are no
longer needed with current Travis build environment. Resolves
issue 30213.
- In Travis, show stem's tor log after failure. Closes ticket 30234.
o Minor features (controller):
- Add onion service version 3 support to the HSFETCH command.
Previously, only version 2 onion services were supported. Closes
ticket 25417. Patch by Neel Chauhan.
o Minor features (debugging):
- Introduce tor_assertf() and tor_assertf_nonfatal() to enable
logging of additional information during assert failure. Now we
can use format strings to include information for trouble
shooting. Resolves ticket 29662.
o Minor features (defense in depth):
- In smartlist_remove_keeporder(), set unused pointers to NULL, in
case a bug causes them to be used later. Closes ticket 30176.
Patch from Tobias Stoeckmann.
- Tor now uses a cryptographically strong PRNG even for decisions
that we do not believe are security-sensitive. Previously, for
performance reasons, we had used a trivially predictable linear
congruential generator algorithm for certain load-balancing and
statistical sampling decisions. Now we use our fast RNG in those
cases. Closes ticket 29542.
o Minor features (developer tools):
- Tor's "practracker" test script now checks for files and functions
that seem too long and complicated. Existing overlong functions
and files are accepted for now, but should eventually be
refactored. Closes ticket 29221.
- Add some scripts used for git maintenance to scripts/git. Closes
ticket 29391.
- Call practracker from pre-push and pre-commit git hooks to let
developers know if they made any code style violations. Closes
ticket 30051.
- Add a script to check that each header has a well-formed and
unique guard macro. Closes ticket 29756.
o Minor features (geoip):
- Update geoip and geoip6 to the May 13 2019 Maxmind GeoLite2
Country database. Closes ticket 30522.
o Minor features (HTTP tunnel):
- Return an informative web page when the HTTPTunnelPort is used as
an HTTP proxy. Closes ticket 27821, patch by "eighthave".
o Minor features (IPv6, v3 onion services):
- Make v3 onion services put IPv6 addresses in service descriptors.
Before this change, service descriptors only contained IPv4
addresses. Implements 26992.
o Minor features (modularity):
- The "--disable-module-dirauth" compile-time option now disables
even more dirauth-only code. Closes ticket 30345.
o Minor features (performance):
- Use OpenSSL's implementations of SHA3 when available (in OpenSSL
1.1.1 and later), since they tend to be faster than tiny-keccak.
Closes ticket 28837.
o Minor features (testing):
- Tor's unit test code now contains helper functions to replace the
PRNG with a deterministic or reproducible version for testing.
Previously, various tests implemented this in various ways.
Implements ticket 29732.
- We now have a script, cov-test-determinism.sh, to identify places
where our unit test coverage has become nondeterministic. Closes
ticket 29436.
- Check that representative subsets of values of `int` and `unsigned
int` can be represented by `void *`. Resolves issue 29537.
o Minor bugfixes (bridge authority):
- Bridge authorities now set bridges as running or non-running when
about to dump their status to a file. Previously, they set bridges
as running in response to a GETINFO command, but those shouldn't
modify data structures. Fixes bug 24490; bugfix on 0.2.0.13-alpha.
Patch by Neel Chauhan.
o Minor bugfixes (channel padding statistics):
- Channel padding write totals and padding-enabled totals are now
counted properly in relay extrainfo descriptors. Fixes bug 29231;
bugfix on 0.3.1.1-alpha.
o Minor bugfixes (circuit padding):
- Add a "CircuitPadding" torrc option to disable circuit padding.
Fixes bug 28693; bugfix on 0.4.0.1-alpha.
- Allow circuit padding machines to specify that they do not
contribute much overhead, and provide consensus flags and torrc
options to force clients to only use these low overhead machines.
Fixes bug 29203; bugfix on 0.4.0.1-alpha.
- Provide a consensus parameter to fully disable circuit padding, to
be used in emergency network overload situations. Fixes bug 30173;
bugfix on 0.4.0.1-alpha.
- The circuit padding subsystem will no longer schedule padding if
dormant mode is enabled. Fixes bug 28636; bugfix on 0.4.0.1-alpha.
- Inspect a circuit-level cell queue before sending padding, to
avoid sending padding while too much data is already queued. Fixes
bug 29204; bugfix on 0.4.0.1-alpha.
- Avoid calling monotime_absolute_usec() in circuit padding machines
that do not use token removal or circuit RTT estimation. Fixes bug
29085; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (compilation, unusual configurations):
- Avoid failures when building with the ALL_BUGS_ARE_FATAL option
due to missing declarations of abort(), and prevent other such
failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (controller protocol):
- Teach the controller parser to distinguish an object preceded by
an argument list from one without. Previously, it couldn't
distinguish an argument list from the first line of a multiline
object. Fixes bug 29984; bugfix on 0.2.3.8-alpha.
o Minor bugfixes (directory authority, ipv6):
- Directory authorities with IPv6 support now always mark themselves
as reachable via IPv6. Fixes bug 24338; bugfix on 0.2.4.1-alpha.
Patch by Neel Chauhan.
o Minor bugfixes (documentation):
- Improve the documentation for using MapAddress with ".exit". Fixes
bug 30109; bugfix on 0.1.0.1-rc.
- Improve the monotonic time module and function documentation to
explain what "monotonic" actually means, and document some results
that have surprised people. Fixes bug 29640; bugfix
on 0.2.9.1-alpha.
- Use proper formatting when providing an example on quoting options
that contain whitespace. Fixes bug 29635; bugfix on 0.2.3.18-rc.
o Minor bugfixes (logging):
- Do not log a warning when running with an OpenSSL version other
than the one Tor was compiled with, if the two versions should be
compatible. Previously, we would warn whenever the version was
different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.
- Warn operators when the MyFamily option is set but ContactInfo is
missing, as the latter should be set too. Fixes bug 25110; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (memory leak):
- Avoid a minor memory leak that could occur on relays when failing
to create a "keys" directory. Fixes bug 30148; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (onion services):
- Avoid a GCC 9.1.1 warning (and possible crash depending on libc
implementation) when failing to load an onion service client
authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.
- When refusing to launch a controller's HSFETCH request because of
rate-limiting, respond to the controller with a new response,
"QUERY_RATE_LIMITED". Previously, we would log QUERY_NO_HSDIR for
this case. Fixes bug 28269; bugfix on 0.3.1.1-alpha. Patch by
Neel Chauhan.
- When relaunching a circuit to a rendezvous service, mark the
circuit as needing high-uptime routers as appropriate. Fixes bug
17357; bugfix on 0.1.0.1-rc. Patch by Neel Chauhan.
- Stop ignoring IPv6 link specifiers sent to v3 onion services.
(IPv6 support for v3 onion services is still incomplete: see
ticket 23493 for details.) Fixes bug 23588; bugfix on
0.3.2.1-alpha. Patch by Neel Chauhan.
o Minor bugfixes (onion services, performance):
- When building circuits to onion services, call tor_addr_parse()
less often. Previously, we called tor_addr_parse() in
circuit_is_acceptable() even if its output wasn't used. This
change should improve performance when building circuits. Fixes
bug 22210; bugfix on 0.2.8.12. Patch by Neel Chauhan.
o Minor bugfixes (performance):
- When checking whether a node is a bridge, use a fast check to make
sure that its identity is set. Previously, we used a constant-time
check, which is not necessary in this case. Fixes bug 30308;
bugfix on 0.3.5.1-alpha.
o Minor bugfixes (pluggable transports):
- Tor now sets TOR_PT_EXIT_ON_STDIN_CLOSE=1 for client transports as
well as servers. Fixes bug 25614; bugfix on 0.2.7.1-alpha.
o Minor bugfixes (probability distributions):
- Refactor and improve parts of the probability distribution code
that made Coverity complain. Fixes bug 29805; bugfix
on 0.4.0.1-alpha.
o Minor bugfixes (python):
- Stop assuming that /usr/bin/python3 exists. For scripts that work
with python2, use /usr/bin/python. Otherwise, use /usr/bin/env
python3. Fixes bug 29913; bugfix on 0.2.5.3-alpha.
o Minor bugfixes (relay):
- When running as a relay, if IPv6Exit is set to 1 while ExitRelay
is auto, act as if ExitRelay is 1. Previously, we would ignore
IPv6Exit if ExitRelay was 0 or auto. Fixes bug 29613; bugfix on
0.3.5.1-alpha. Patch by Neel Chauhan.
o Minor bugfixes (stats):
- When ExtraInfoStatistics is 0, stop including bandwidth usage
statistics, GeoIPFile hashes, ServerTransportPlugin lines, and
bridge statistics by country in extra-info documents. Fixes bug
29018; bugfix on 0.2.4.1-alpha.
o Minor bugfixes (testing):
- Call setrlimit() to disable core dumps in test_bt_cl.c. Previously
we used `ulimit -c` in test_bt.sh, which violates POSIX shell
compatibility. Fixes bug 29061; bugfix on 0.3.5.1-alpha.
- Fix some incorrect code in the v3 onion service unit tests. Fixes
bug 29243; bugfix on 0.3.2.1-alpha.
- In the "routerkeys/*" tests, check the return values of mkdir()
for possible failures. Fixes bug 29939; bugfix on 0.2.7.2-alpha.
Found by Coverity as CID 1444254.
- Split test_utils_general() into several smaller test functions.
This makes it easier to perform resource deallocation on assert
failure, and fixes Coverity warnings CID 1444117 and CID 1444118.
Fixes bug 29823; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (tor-resolve):
- Fix a memory leak in tor-resolve that could happen if Tor gave it
a malformed SOCKS response. (Memory leaks in tor-resolve don't
actually matter, but it's good to fix them anyway.) Fixes bug
30151; bugfix on 0.4.0.1-alpha.
o Code simplification and refactoring:
- Abstract out the low-level formatting of replies on the control
port. Implements ticket 30007.
- Add several assertions in an attempt to fix some Coverity
warnings. Closes ticket 30149.
- Introduce a connection_dir_buf_add() helper function that checks
for compress_state of dir_connection_t and automatically writes a
string to directory connection with or without compression.
Resolves issue 28816.
- Make the base32_decode() API return the number of bytes written,
for consistency with base64_decode(). Closes ticket 28913.
- Move most relay-only periodic events out of mainloop.c into the
relay subsystem. Closes ticket 30414.
- Refactor and encapsulate parts of the codebase that manipulate
crypt_path_t objects. Resolves issue 30236.
- Refactor several places in our code that Coverity incorrectly
believed might have memory leaks. Closes ticket 30147.
- Remove redundant return values in crypto_format, and the
associated return value checks elsewhere in the code. Make the
implementations in crypto_format consistent, and remove redundant
code. Resolves ticket 29660.
- Rename tor_mem_is_zero() to fast_mem_is_zero(), to emphasize that
it is not a constant-time function. Closes ticket 30309.
- Replace hs_desc_link_specifier_t with link_specifier_t, and remove
all hs_desc_link_specifier_t-specific code. Fixes bug 22781;
bugfix on 0.3.2.1-alpha.
- Simplify v3 onion service link specifier handling code. Fixes bug
23576; bugfix on 0.3.2.1-alpha.
- Split crypto_digest.c into NSS code, OpenSSL code, and shared
code. Resolves ticket 29108.
- Split control.c into several submodules, in preparation for
distributing its current responsibilities throughout the codebase.
Closes ticket 29894.
- Start to move responsibility for knowing about periodic events to
the appropriate subsystems, so that the mainloop doesn't need to
know all the periodic events in the rest of the codebase.
Implements tickets 30293 and 30294.
o Documentation:
- Document how to find git commits and tags for bug fixes in
CodingStandards.md. Update some file documentation. Closes
ticket 30261.
o Removed features:
- Remove the linux-tor-prio.sh script from contrib/operator-tools
directory. Resolves issue 29434.
- Remove the obsolete OpenSUSE initscript. Resolves issue 30076.
- Remove the obsolete script at contrib/dist/tor.sh.in. Resolves
issue 30075.
o Code simplification and refactoring (shell scripts):
- Clean up many of our shell scripts to fix shellcheck warnings.
These include autogen.sh (ticket 26069), test_keygen.sh (ticket
29062), test_switch_id.sh (ticket 29065), test_rebind.sh (ticket
29063), src/test/fuzz/minimize.sh (ticket 30079), test_rust.sh
(ticket 29064), torify (ticket 29070), asciidoc-helper.sh (29926),
fuzz_multi.sh (30077), fuzz_static_testcases.sh (ticket 29059),
nagios-check-tor-authority-cert (ticket 29071),
src/test/fuzz/fixup_filenames.sh (ticket 30078), test-network.sh
(ticket 29060), test_key_expiration.sh (ticket 30002),
zero_length_keys.sh (ticket 29068), and test_workqueue_*.sh
(ticket 29067).
o Testing (chutney):
- In "make test-network-all", test IPv6-only v3 single onion
services, using the chutney network single-onion-v23-ipv6-md.
Closes ticket 27251.
Changes in version 0.4.0.5 - 2019-05-02
This is the first stable release in the 0.4.0.x series. It contains
improvements for power management and bootstrap reporting, as well as
preliminary backend support for circuit padding to prevent some kinds
of traffic analysis. It also continues our work in refactoring Tor for
long-term maintainability.
Per our support policy, we will support the 0.4.0.x series for nine
months, or until three months after the release of a stable 0.4.1.x:
whichever is longer. If you need longer-term support, please stick
with 0.3.5.x, which will we plan to support until Feb 2022.
Below are the changes since 0.4.0.4-rc. For a complete list of changes
since 0.3.5.7, see the ReleaseNotes file.
o Minor features (continuous integration):
- In Travis, tell timelimit to use stem's backtrace signals, and
launch python directly from timelimit, so python receives the
signals from timelimit, rather than make. Closes ticket 30117.
o Minor features (diagnostic):
- Add more diagnostic log messages in an attempt to solve the issue
of NUL bytes appearing in a microdescriptor cache. Related to
ticket 28223.
o Minor features (testing):
- Use the approx_time() function when setting the "Expires" header
in directory replies, to make them more testable. Needed for
ticket 30001.
o Minor bugfixes (rust):
- Abort on panic in all build profiles, instead of potentially
unwinding into C code. Fixes bug 27199; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (shellcheck):
- Look for scripts in their correct locations during "make
shellcheck". Previously we had looked in the wrong place during
out-of-tree builds. Fixes bug 30263; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (testing):
- Check the time in the "Expires" header using approx_time(). Fixes
bug 30001; bugfix on 0.4.0.4-rc.
o Minor bugfixes (UI):
- Lower log level of unlink() errors during bootstrap. Fixes bug
29930; bugfix on 0.4.0.1-alpha.
Changes in version 0.4.0.4-rc - 2019-04-11
Tor 0.4.0.4-rc is the first release candidate in its series; it fixes
several bugs from earlier versions, including some that had affected
stability, and one that prevented relays from working with NSS.
o Major bugfixes (NSS, relay):
- When running with NSS, disable TLS 1.2 ciphersuites that use
SHA384 for their PRF. Due to an NSS bug, the TLS key exporters for
these ciphersuites don't work -- which caused relays to fail to
handshake with one another when these ciphersuites were enabled.
Fixes bug 29241; bugfix on 0.3.5.1-alpha.
o Minor features (bandwidth authority):
- Make bandwidth authorities ignore relays that are reported in the
bandwidth file with the flag "vote=0". This change allows us to
report unmeasured relays for diagnostic reasons without including
their bandwidth in the bandwidth authorities' vote. Closes
ticket 29806.
- When a directory authority is using a bandwidth file to obtain the
bandwidth values that will be included in the next vote, serve
this bandwidth file at /tor/status-vote/next/bandwidth. Closes
ticket 21377.
o Minor features (circuit padding):
- Stop warning about undefined behavior in the probability
distribution tests. Float division by zero may technically be
undefined behavior in C, but it's well defined in IEEE 754.
Partial backport of 29298. Closes ticket 29527; bugfix
on 0.4.0.1-alpha.
o Minor features (continuous integration):
- On Travis Rust builds, cleanup Rust registry and refrain from
caching the "target/" directory to speed up builds. Resolves
issue 29962.
o Minor features (dormant mode):
- Add a DormantCanceledByStartup option to tell Tor that it should
treat a startup event as cancelling any previous dormant state.
Integrators should use this option with caution: it should only be
used if Tor is being started because of something that the user
did, and not if Tor is being automatically started in the
background. Closes ticket 29357.
o Minor features (geoip):
- Update geoip and geoip6 to the April 2 2019 Maxmind GeoLite2
Country database. Closes ticket 29992.
o Minor features (NSS, diagnostic):
- Try to log an error from NSS (if there is any) and a more useful
description of our situation if we are using NSS and a call to
SSL_ExportKeyingMaterial() fails. Diagnostic for ticket 29241.
o Minor bugfixes (security):
- Fix a potential double free bug when reading huge bandwidth files.
The issue is not exploitable in the current Tor network because
the vulnerable code is only reached when directory authorities
read bandwidth files, but bandwidth files come from a trusted
source (usually the authorities themselves). Furthermore, the
issue is only exploitable in rare (non-POSIX) 32-bit architectures,
which are not used by any of the current authorities. Fixes bug
30040; bugfix on 0.3.5.1-alpha. Bug found and fixed by
Tobias Stoeckmann.
- Verify in more places that we are not about to create a buffer
with more than INT_MAX bytes, to avoid possible OOB access in the
event of bugs. Fixes bug 30041; bugfix on 0.2.0.16. Found and
fixed by Tobias Stoeckmann.
o Minor bugfix (continuous integration):
- Reset coverage state on disk after Travis CI has finished. This
should prevent future coverage merge errors from causing the test
suite for the "process" subsystem to fail. The process subsystem
was introduced in 0.4.0.1-alpha. Fixes bug 29036; bugfix
on 0.2.9.15.
- Terminate test-stem if it takes more than 9.5 minutes to run.
(Travis terminates the job after 10 minutes of no output.)
Diagnostic for 29437. Fixes bug 30011; bugfix on 0.3.5.4-alpha.
o Minor bugfixes (bootstrap reporting):
- During bootstrap reporting, correctly distinguish pluggable
transports from plain proxies. Fixes bug 28925; bugfix
on 0.4.0.1-alpha.
o Minor bugfixes (C correctness):
- Fix an unlikely memory leak in consensus_diff_apply(). Fixes bug
29824; bugfix on 0.3.1.1-alpha. This is Coverity warning
CID 1444119.
o Minor bugfixes (circuitpadding testing):
- Minor tweaks to avoid rare test failures related to timers and
monotonic time. Fixes bug 29500; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (directory authorities):
- Actually include the bandwidth-file-digest line in directory
authority votes. Fixes bug 29959; bugfix on 0.4.0.2-alpha.
o Minor bugfixes (logging):
- On Windows, when errors cause us to reload a consensus from disk,
tell the user that we are retrying at log level "notice".
Previously we only logged this information at "info", which was
confusing because the errors themselves were logged at "warning".
Improves previous fix for 28614. Fixes bug 30004; bugfix
on 0.4.0.2-alpha.
o Minor bugfixes (pluggable transports):
- Restore old behavior when it comes to discovering the path of a
given Pluggable Transport executable file. A change in
0.4.0.1-alpha had broken this behavior on paths containing a
space. Fixes bug 29874; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (testing):
- Backport the 0.3.4 src/test/test-network.sh to 0.2.9. We need a
recent test-network.sh to use new chutney features in CI. Fixes
bug 29703; bugfix on 0.2.9.1-alpha.
- Fix a test failure on Windows caused by an unexpected "BUG"
warning in our tests for tor_gmtime_r(-1). Fixes bug 29922; bugfix
on 0.2.9.3-alpha.
o Minor bugfixes (TLS protocol):
- When classifying a client's selection of TLS ciphers, if the
client ciphers are not yet available, do not cache the result.
Previously, we had cached the unavailability of the cipher list
and never looked again, which in turn led us to assume that the
client only supported the ancient V1 link protocol. This, in turn,
was causing Stem integration tests to stall in some cases. Fixes
bug 30021; bugfix on 0.2.4.8-alpha.
o Code simplification and refactoring:
- Introduce a connection_dir_buf_add() helper function that detects
whether compression is in use, and adds a string accordingly.
Resolves issue 28816.
- Refactor handle_get_next_bandwidth() to use
connection_dir_buf_add(). Implements ticket 29897.
o Documentation:
- Clarify that Tor performs stream isolation among *Port listeners
by default. Resolves issue 29121.
Changes in version 0.4.0.3-alpha - 2019-03-22
Tor 0.4.0.3-alpha is the third in its series; it fixes several small
bugs from earlier versions.
o Minor features (address selection):
- Treat the subnet 100.64.0.0/10 as public for some purposes;
private for others. This subnet is the RFC 6598 (Carrier Grade
NAT) IP range, and is deployed by many ISPs as an alternative to
RFC 1918 that does not break existing internal networks. Tor now
blocks SOCKS and control ports on these addresses and warns users
if client ports or ExtORPorts are listening on a RFC 6598 address.
Closes ticket 28525. Patch by Neel Chauhan.
o Minor features (geoip):
- Update geoip and geoip6 to the March 4 2019 Maxmind GeoLite2
Country database. Closes ticket 29666.
o Minor bugfixes (circuitpadding):
- Inspect the circuit-level cell queue before sending padding, to
avoid sending padding when too much data is queued. Fixes bug
29204; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (logging):
- Correct a misleading error message when IPv4Only or IPv6Only is
used but the resolved address can not be interpreted as an address
of the specified IP version. Fixes bug 13221; bugfix on
0.2.3.9-alpha. Patch from Kris Katterjohn.
- Log the correct port number for listening sockets when "auto" is
used to let Tor pick the port number. Previously, port 0 was
logged instead of the actual port number. Fixes bug 29144; bugfix
on 0.3.5.1-alpha. Patch from Kris Katterjohn.
- Stop logging a BUG() warning when Tor is waiting for exit
descriptors. Fixes bug 28656; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (memory management):
- Refactor the shared random state's memory management so that it
actually takes ownership of the shared random value pointers.
Fixes bug 29706; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (memory management, testing):
- Stop leaking parts of the shared random state in the shared-random
unit tests. Fixes bug 29599; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (pluggable transports):
- Fix an assertion failure crash bug when a pluggable transport is
terminated during the bootstrap phase. Fixes bug 29562; bugfix
on 0.4.0.1-alpha.
o Minor bugfixes (Rust, protover):
- Add a missing "Padding" value to the Rust implementation of
protover. Fixes bug 29631; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (single onion services):
- Allow connections to single onion services to remain idle without
being disconnected. Previously, relays acting as rendezvous points
for single onion services were mistakenly closing idle rendezvous
circuits after 60 seconds, thinking that they were unused
directory-fetching circuits that had served their purpose. Fixes
bug 29665; bugfix on 0.2.1.26.
o Minor bugfixes (stats):
- When ExtraInfoStatistics is 0, stop including PaddingStatistics in
relay and bridge extra-info documents. Fixes bug 29017; bugfix
on 0.3.1.1-alpha.
o Minor bugfixes (testing):
- Downgrade some LOG_ERR messages in the address/* tests to
warnings. The LOG_ERR messages were occurring when we had no
configured network. We were failing the unit tests, because we
backported 28668 to 0.3.5.8, but did not backport 29530. Fixes bug
29530; bugfix on 0.3.5.8.
- Fix our gcov wrapper script to look for object files at the
correct locations. Fixes bug 29435; bugfix on 0.3.5.1-alpha.
- Decrease the false positive rate of stochastic probability
distribution tests. Fixes bug 29693; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (Windows, CI):
- Skip the Appveyor 32-bit Windows Server 2016 job, and 64-bit
Windows Server 2012 R2 job. The remaining 2 jobs still provide
coverage of 64/32-bit, and Windows Server 2016/2012 R2. Also set
fast_finish, so failed jobs terminate the build immediately. Fixes
bug 29601; bugfix on 0.3.5.4-alpha.
Changes in version 0.3.5.8 - 2019-02-21
Tor 0.3.5.8 backports several fixes from later releases, including fixes
for an annoying SOCKS-parsing bug that affected users in earlier 0.3.5.x
releases.
It also includes a fix for a medium-severity security bug affecting Tor
0.3.2.1-alpha and later. All Tor instances running an affected release
should upgrade to 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha.
o Major bugfixes (cell scheduler, KIST, security):
- Make KIST consider the outbuf length when computing what it can
put in the outbuf. Previously, KIST acted as though the outbuf
were empty, which could lead to the outbuf becoming too full. It
is possible that an attacker could exploit this bug to cause a Tor
client or relay to run out of memory and crash. Fixes bug 29168;
bugfix on 0.3.2.1-alpha. This issue is also being tracked as
TROVE-2019-001 and CVE-2019-8955.
o Major bugfixes (networking, backport from 0.4.0.2-alpha):
- Gracefully handle empty username/password fields in SOCKS5
username/password auth message and allow SOCKS5 handshake to
continue. Previously, we had rejected these handshakes, breaking
certain applications. Fixes bug 29175; bugfix on 0.3.5.1-alpha.
o Minor features (compilation, backport from 0.4.0.2-alpha):
- Compile correctly when OpenSSL is built with engine support
disabled, or with deprecated APIs disabled. Closes ticket 29026.
Patches from "Mangix".
o Minor features (geoip):
- Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
Country database. Closes ticket 29478.
o Minor features (testing, backport from 0.4.0.2-alpha):
- Treat all unexpected ERR and BUG messages as test failures. Closes
ticket 28668.
o Minor bugfixes (onion service v3, client, backport from 0.4.0.1-alpha):
- Stop logging a "BUG()" warning and stacktrace when we find a SOCKS
connection waiting for a descriptor that we actually have in the
cache. It turns out that this can actually happen, though it is
rare. Now, tor will recover and retry the descriptor. Fixes bug
28669; bugfix on 0.3.2.4-alpha.
o Minor bugfixes (IPv6, backport from 0.4.0.1-alpha):
- Fix tor_ersatz_socketpair on IPv6-only systems. Previously, the
IPv6 socket was bound using an address family of AF_INET instead
of AF_INET6. Fixes bug 28995; bugfix on 0.3.5.1-alpha. Patch from
Kris Katterjohn.
o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha):
- Update Cargo.lock file to match the version made by the latest
version of Rust, so that "make distcheck" will pass again. Fixes
bug 29244; bugfix on 0.3.3.4-alpha.
o Minor bugfixes (client, clock skew, backport from 0.4.0.1-alpha):
- Select guards even if the consensus has expired, as long as the
consensus is still reasonably live. Fixes bug 24661; bugfix
on 0.3.0.1-alpha.
o Minor bugfixes (compilation, backport from 0.4.0.1-alpha):
- Compile correctly on OpenBSD; previously, we were missing some
headers required in order to detect it properly. Fixes bug 28938;
bugfix on 0.3.5.1-alpha. Patch from Kris Katterjohn.
o Minor bugfixes (documentation, backport from 0.4.0.2-alpha):
- Describe the contents of the v3 onion service client authorization
files correctly: They hold public keys, not private keys. Fixes
bug 28979; bugfix on 0.3.5.1-alpha. Spotted by "Felixix".
o Minor bugfixes (logging, backport from 0.4.0.1-alpha):
- Rework rep_hist_log_link_protocol_counts() to iterate through all
link protocol versions when logging incoming/outgoing connection
counts. Tor no longer skips version 5, and we won't have to
remember to update this function when new link protocol version is
developed. Fixes bug 28920; bugfix on 0.2.6.10.
o Minor bugfixes (logging, backport from 0.4.0.2-alpha):
- Log more information at "warning" level when unable to read a
private key; log more information at "info" level when unable to
read a public key. We had warnings here before, but they were lost
during our NSS work. Fixes bug 29042; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (misc, backport from 0.4.0.2-alpha):
- The amount of total available physical memory is now determined
using the sysctl identifier HW_PHYSMEM (rather than HW_USERMEM)
when it is defined and a 64-bit variant is not available. Fixes
bug 28981; bugfix on 0.2.5.4-alpha. Patch from Kris Katterjohn.
o Minor bugfixes (onion services, backport from 0.4.0.2-alpha):
- Avoid crashing if ClientOnionAuthDir (incorrectly) contains more
than one private key for a hidden service. Fixes bug 29040; bugfix
on 0.3.5.1-alpha.
- In hs_cache_store_as_client() log an HSDesc we failed to parse at
"debug" level. Tor used to log it as a warning, which caused very
long log lines to appear for some users. Fixes bug 29135; bugfix
on 0.3.2.1-alpha.
- Stop logging "Tried to establish rendezvous on non-OR circuit..."
as a warning. Instead, log it as a protocol warning, because there
is nothing that relay operators can do to fix it. Fixes bug 29029;
bugfix on 0.2.5.7-rc.
o Minor bugfixes (tests, directory clients, backport from 0.4.0.1-alpha):
- Mark outdated dirservers when Tor only has a reasonably live
consensus. Fixes bug 28569; bugfix on 0.3.2.5-alpha.
o Minor bugfixes (tests, backport from 0.4.0.2-alpha):
- Detect and suppress "bug" warnings from the util/time test on
Windows. Fixes bug 29161; bugfix on 0.2.9.3-alpha.
- Do not log an error-level message if we fail to find an IPv6
network interface from the unit tests. Fixes bug 29160; bugfix
on 0.2.7.3-rc.
o Minor bugfixes (usability, backport from 0.4.0.1-alpha):
- Stop saying "Your Guard ..." in pathbias_measure_{use,close}_rate().
Some users took this phrasing to mean that the mentioned guard was
under their control or responsibility, which it is not. Fixes bug
28895; bugfix on Tor 0.3.0.1-alpha.
Changes in version 0.3.4.11 - 2019-02-21
Tor 0.3.4.11 is the third stable release in its series. It includes
a fix for a medium-severity security bug affecting Tor 0.3.2.1-alpha and
later. All Tor instances running an affected release should upgrade to
0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha.
o Major bugfixes (cell scheduler, KIST, security):
- Make KIST consider the outbuf length when computing what it can
put in the outbuf. Previously, KIST acted as though the outbuf
were empty, which could lead to the outbuf becoming too full. It
is possible that an attacker could exploit this bug to cause a Tor
client or relay to run out of memory and crash. Fixes bug 29168;
bugfix on 0.3.2.1-alpha. This issue is also being tracked as
TROVE-2019-001 and CVE-2019-8955.
o Minor features (geoip):
- Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
Country database. Closes ticket 29478.
o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha):
- Update Cargo.lock file to match the version made by the latest
version of Rust, so that "make distcheck" will pass again. Fixes
bug 29244; bugfix on 0.3.3.4-alpha.
o Minor bugfixes (onion services, backport from 0.4.0.2-alpha):
- Stop logging "Tried to establish rendezvous on non-OR circuit..."
as a warning. Instead, log it as a protocol warning, because there
is nothing that relay operators can do to fix it. Fixes bug 29029;
bugfix on 0.2.5.7-rc.
Changes in version 0.3.3.12 - 2019-02-21
Tor 0.3.3.12 fixes a medium-severity security bug affecting Tor
0.3.2.1-alpha and later. All Tor instances running an affected release
should upgrade to 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha.
This release marks the end of support for the Tor 0.3.3.x series. We
recommend that users switch to either the Tor 0.3.4 series (supported
until at least 10 June 2019), or the Tor 0.3.5 series, which will
receive long-term support until at least 1 Feb 2022.
o Major bugfixes (cell scheduler, KIST, security):
- Make KIST consider the outbuf length when computing what it can
put in the outbuf. Previously, KIST acted as though the outbuf
were empty, which could lead to the outbuf becoming too full. It
is possible that an attacker could exploit this bug to cause a Tor
client or relay to run out of memory and crash. Fixes bug 29168;
bugfix on 0.3.2.1-alpha. This issue is also being tracked as
TROVE-2019-001 and CVE-2019-8955.
o Minor features (geoip):
- Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
Country database. Closes ticket 29478.
o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha):
- Update Cargo.lock file to match the version made by the latest
version of Rust, so that "make distcheck" will pass again. Fixes
bug 29244; bugfix on 0.3.3.4-alpha.
o Minor bugfixes (onion services, backport from 0.4.0.2-alpha):
- Stop logging "Tried to establish rendezvous on non-OR circuit..."
as a warning. Instead, log it as a protocol warning, because there
is nothing that relay operators can do to fix it. Fixes bug 29029;
bugfix on 0.2.5.7-rc.
Changes in version 0.4.0.2-alpha - 2019-02-21
Tor 0.4.0.2-alpha is the second alpha in its series; it fixes several
bugs from earlier versions, including several that had broken
backward compatibility.
It also includes a fix for a medium-severity security bug affecting Tor
0.3.2.1-alpha and later. All Tor instances running an affected release
should upgrade to 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha.
o Major bugfixes (cell scheduler, KIST, security):
- Make KIST consider the outbuf length when computing what it can
put in the outbuf. Previously, KIST acted as though the outbuf
were empty, which could lead to the outbuf becoming too full. It
is possible that an attacker could exploit this bug to cause a Tor
client or relay to run out of memory and crash. Fixes bug 29168;
bugfix on 0.3.2.1-alpha. This issue is also being tracked as
TROVE-2019-001 and CVE-2019-8955.
o Major bugfixes (networking):
- Gracefully handle empty username/password fields in SOCKS5
username/password auth messsage and allow SOCKS5 handshake to
continue. Previously, we had rejected these handshakes, breaking
certain applications. Fixes bug 29175; bugfix on 0.3.5.1-alpha.
o Major bugfixes (windows, startup):
- When reading a consensus file from disk, detect whether it was
written in text mode, and re-read it in text mode if so. Always
write consensus files in binary mode so that we can map them into
memory later. Previously, we had written in text mode, which
confused us when we tried to map the file on windows. Fixes bug
28614; bugfix on 0.4.0.1-alpha.
o Minor features (compilation):
- Compile correctly when OpenSSL is built with engine support
disabled, or with deprecated APIs disabled. Closes ticket 29026.
Patches from "Mangix".
o Minor features (developer tooling):
- Check that bugfix versions in changes files look like Tor versions
from the versions spec. Warn when bugfixes claim to be on a future
release. Closes ticket 27761.
- Provide a git pre-commit hook that disallows committing if we have
any failures in our code and changelog formatting checks. It is
now available in scripts/maint/pre-commit.git-hook. Implements
feature 28976.
o Minor features (directory authority):
- When a directory authority is using a bandwidth file to obtain
bandwidth values, include the digest of that file in the vote.
Closes ticket 26698.
o Minor features (geoip):
- Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
Country database. Closes ticket 29478.
o Minor features (testing):
- Treat all unexpected ERR and BUG messages as test failures. Closes
ticket 28668.
o Minor bugfixes (build, compatibility, rust):
- Update Cargo.lock file to match the version made by the latest
version of Rust, so that "make distcheck" will pass again. Fixes
bug 29244; bugfix on 0.3.3.4-alpha.
o Minor bugfixes (compilation):
- Fix compilation warnings in test_circuitpadding.c. Fixes bug
29169; bugfix on 0.4.0.1-alpha.
- Silence a compiler warning in test-memwipe.c on OpenBSD. Fixes bug
29145; bugfix on 0.2.9.3-alpha. Patch from Kris Katterjohn.
o Minor bugfixes (documentation):
- Describe the contents of the v3 onion service client authorization
files correctly: They hold public keys, not private keys. Fixes
bug 28979; bugfix on 0.3.5.1-alpha. Spotted by "Felixix".
o Minor bugfixes (linux seccomp sandbox):
- Fix startup crash when experimental sandbox support is enabled.
Fixes bug 29150; bugfix on 0.4.0.1-alpha. Patch by Peter Gerber.
o Minor bugfixes (logging):
- Avoid logging that we are relaxing a circuit timeout when that
timeout is fixed. Fixes bug 28698; bugfix on 0.2.4.7-alpha.
- Log more information at "warning" level when unable to read a
private key; log more information at "info" level when unable to
read a public key. We had warnings here before, but they were lost
during our NSS work. Fixes bug 29042; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (misc):
- The amount of total available physical memory is now determined
using the sysctl identifier HW_PHYSMEM (rather than HW_USERMEM)
when it is defined and a 64-bit variant is not available. Fixes
bug 28981; bugfix on 0.2.5.4-alpha. Patch from Kris Katterjohn.
o Minor bugfixes (onion services):
- Avoid crashing if ClientOnionAuthDir (incorrectly) contains more
than one private key for a hidden service. Fixes bug 29040; bugfix
on 0.3.5.1-alpha.
- In hs_cache_store_as_client() log an HSDesc we failed to parse at
"debug" level. Tor used to log it as a warning, which caused very
long log lines to appear for some users. Fixes bug 29135; bugfix
on 0.3.2.1-alpha.
- Stop logging "Tried to establish rendezvous on non-OR circuit..."
as a warning. Instead, log it as a protocol warning, because there
is nothing that relay operators can do to fix it. Fixes bug 29029;
bugfix on 0.2.5.7-rc.
o Minor bugfixes (scheduler):
- When re-adding channels to the pending list, check the correct
channel's sched_heap_idx. This issue has had no effect in mainline
Tor, but could have led to bugs down the road in improved versions
of our circuit scheduling code. Fixes bug 29508; bugfix
on 0.3.2.10.
o Minor bugfixes (tests):
- Fix intermittent failures on an adaptive padding test. Fixes one
case of bug 29122; bugfix on 0.4.0.1-alpha.
- Disable an unstable circuit-padding test that was failing
intermittently because of an ill-defined small histogram. Such
histograms will be allowed again after 29298 is implemented. Fixes
a second case of bug 29122; bugfix on 0.4.0.1-alpha.
- Detect and suppress "bug" warnings from the util/time test on
Windows. Fixes bug 29161; bugfix on 0.2.9.3-alpha.
- Do not log an error-level message if we fail to find an IPv6
network interface from the unit tests. Fixes bug 29160; bugfix
on 0.2.7.3-rc.
o Documentation:
- In the manpage entry describing MapAddress torrc setting, use
example IP addresses from ranges specified for use in documentation
by RFC 5737. Resolves issue 28623.
o Removed features:
- Remove the old check-tor script. Resolves issue 29072.
Changes in version 0.4.0.1-alpha - 2019-01-18
Tor 0.4.0.1-alpha is the first release in the new 0.4.0.x series. It
introduces improved features for power and bandwidth conservation,
more accurate reporting of bootstrap progress for user interfaces, and
an experimental backend for an exciting new adaptive padding feature.
There is also the usual assortment of bugfixes and minor features, all
described below.
o Major features (battery management, client, dormant mode):
- When Tor is running as a client, and it is unused for a long time,
it can now enter a "dormant" state. When Tor is dormant, it avoids
network and CPU activity until it is reawoken either by a user
request or by a controller command. For more information, see the
configuration options starting with "Dormant". Implements tickets
2149 and 28335.
- The client's memory of whether it is "dormant", and how long it
has spent idle, persists across invocations. Implements
ticket 28624.
- There is a DormantOnFirstStartup option that integrators can use
if they expect that in many cases, Tor will be installed but
not used.
o Major features (bootstrap reporting):
- When reporting bootstrap progress, report the first connection
uniformly, regardless of whether it's a connection for building
application circuits. This allows finer-grained reporting of early
progress than previously possible, with the improvements of ticket
27169. Closes tickets 27167 and 27103. Addresses ticket 27308.
- When reporting bootstrap progress, treat connecting to a proxy or
pluggable transport as separate from having successfully used that
proxy or pluggable transport to connect to a relay. Closes tickets
27100 and 28884.
o Major features (circuit padding):
- Implement preliminary support for the circuit padding portion of
Proposal 254. The implementation supports Adaptive Padding (aka
WTF-PAD) state machines for use between experimental clients and
relays. Support is also provided for APE-style state machines that
use probability distributions instead of histograms to specify
inter-packet delay. At the moment, Tor does not provide any
padding state machines that are used in normal operation: for now,
this feature exists solely for experimentation. Closes
ticket 28142.
o Major features (refactoring):
- Tor now uses an explicit list of its own subsystems when
initializing and shutting down. Previously, these systems were
managed implicitly in various places throughout the codebase.
(There may still be some subsystems using the old system.) Closes
ticket 28330.
o Minor features (bootstrap reporting):
- When reporting bootstrap progress, stop distinguishing between
situations where only internal paths are available and situations
where external paths are available. Previously, Tor would often
erroneously report that it had only internal paths. Closes
ticket 27402.
o Minor features (continuous integration):
- Log Python version during each Travis CI job. Resolves
issue 28551.
o Minor features (controller):
- Add a DROPOWNERSHIP command to undo the effects of TAKEOWNERSHIP.
Implements ticket 28843.
o Minor features (developer tooling):
- Provide a git hook script to prevent "fixup!" and "squash!"
commits from ending up in the master branch, as scripts/main/pre-
push.git-hook. Closes ticket 27993.
o Minor features (directory authority):
- Directory authorities support a new consensus algorithm, under
which the family lines in microdescriptors are encoded in a
canonical form. This change makes family lines more compressible
in transit, and on the client. Closes ticket 28266; implements
proposal 298.
o Minor features (directory authority, relay):
- Authorities now vote on a "StaleDesc" flag to indicate that a
relay's descriptor is so old that the relay should upload again
soon. Relays treat this flag as a signal to upload a new
descriptor. This flag will eventually let us remove the
'published' date from routerstatus entries, and make our consensus
diffs much smaller. Closes ticket 26770; implements proposal 293.
o Minor features (fallback directory mirrors):
- Update the fallback whitelist based on operator opt-ins and opt-
outs. Closes ticket 24805, patch by Phoul.
o Minor features (FreeBSD):
- On FreeBSD-based systems, warn relay operators if the
"net.inet.ip.random_id" sysctl (IP ID randomization) is disabled.
Closes ticket 28518.
o Minor features (HTTP standards compliance):
- Stop sending the header "Content-type: application/octet-stream"
along with transparently compressed documents: this confused
browsers. Closes ticket 28100.
o Minor features (IPv6):
- We add an option ClientAutoIPv6ORPort, to make clients randomly
prefer a node's IPv4 or IPv6 ORPort. The random preference is set
every time a node is loaded from a new consensus or bridge config.
We expect that this option will enable clients to bootstrap more
quickly without having to determine whether they support IPv4,
IPv6, or both. Closes ticket 27490. Patch by Neel Chauhan.
- When using addrs_in_same_network_family(), avoid choosing circuit
paths that pass through the same IPv6 subnet more than once.
Previously, we only checked IPv4 subnets. Closes ticket 24393.
Patch by Neel Chauhan.
o Minor features (log messages):
- Improve log message in v3 onion services that could print out
negative revision counters. Closes ticket 27707. Patch
by "ffmancera".
o Minor features (memory usage):
- Save memory by storing microdescriptor family lists with a more
compact representation. Closes ticket 27359.
- Tor clients now use mmap() to read consensus files from disk, so
that they no longer need keep the full text of a consensus in
memory when parsing it or applying a diff. Closes ticket 27244.
o Minor features (parsing):
- Directory authorities now validate that router descriptors and
ExtraInfo documents are in a valid subset of UTF-8, and reject
them if they are not. Closes ticket 27367.
o Minor features (performance):
- Cache the results of summarize_protocol_flags(), so that we don't
have to parse the same protocol-versions string over and over.
This should save us a huge number of malloc calls on startup, and
may reduce memory fragmentation with some allocators. Closes
ticket 27225.
- Remove a needless memset() call from get_token_arguments, thereby
speeding up the tokenization of directory objects by about 20%.
Closes ticket 28852.
- Replace parse_short_policy() with a faster implementation, to
improve microdescriptor parsing time. Closes ticket 28853.
- Speed up directory parsing a little by avoiding use of the non-
inlined strcmp_len() function. Closes ticket 28856.
- Speed up microdescriptor parsing by about 30%, to help improve
startup time. Closes ticket 28839.
o Minor features (pluggable transports):
- Add support for emitting STATUS updates to Tor's control port from
a pluggable transport process. Closes ticket 28846.
- Add support for logging to Tor's logging subsystem from a
pluggable transport process. Closes ticket 28180.
o Minor features (process management):
- Add a new process API for handling child processes. This new API
allows Tor to have bi-directional communication with child
processes on both Unix and Windows. Closes ticket 28179.
- Use the subsystem manager to initialize and shut down the process
module. Closes ticket 28847.
o Minor features (relay):
- When listing relay families, list them in canonical form including
the relay's own identity, and try to give a more useful set of
warnings. Part of ticket 28266 and proposal 298.
o Minor features (required protocols):
- Before exiting because of a missing required protocol, Tor will
now check the publication time of the consensus, and not exit
unless the consensus is newer than the Tor program's own release
date. Previously, Tor would not check the consensus publication
time, and so might exit because of a missing protocol that might
no longer be required in a current consensus. Implements proposal
297; closes ticket 27735.
o Minor features (testing):
- Allow a HeartbeatPeriod of less than 30 minutes in testing Tor
networks. Closes ticket 28840. Patch by Rob Jansen.
o Minor bugfixes (client, clock skew):
- Bootstrap successfully even when Tor's clock is behind the clocks
on the authorities. Fixes bug 28591; bugfix on 0.2.0.9-alpha.
- Select guards even if the consensus has expired, as long as the
consensus is still reasonably live. Fixes bug 24661; bugfix
on 0.3.0.1-alpha.
o Minor bugfixes (compilation):
- Compile correctly on OpenBSD; previously, we were missing some
headers required in order to detect it properly. Fixes bug 28938;
bugfix on 0.3.5.1-alpha. Patch from Kris Katterjohn.
o Minor bugfixes (directory clients):
- Mark outdated dirservers when Tor only has a reasonably live
consensus. Fixes bug 28569; bugfix on 0.3.2.5-alpha.
o Minor bugfixes (directory mirrors):
- Even when a directory mirror's clock is behind the clocks on the
authorities, we now allow the mirror to serve "future"
consensuses. Fixes bug 28654; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (DNS):
- Gracefully handle an empty or absent resolve.conf file by falling
back to using "localhost" as a DNS server (and hoping it works).
Previously, we would just stop running as an exit. Fixes bug
21900; bugfix on 0.2.1.10-alpha.
o Minor bugfixes (guards):
- In count_acceptable_nodes(), the minimum number is now one bridge
or guard node, and two non-guard nodes for a circuit. Previously,
we had added up the sum of all nodes with a descriptor, but that
could cause us to build failing circuits when we had either too
many bridges or not enough guard nodes. Fixes bug 25885; bugfix on
0.2.3.1-alpha. Patch by Neel Chauhan.
o Minor bugfixes (IPv6):
- Fix tor_ersatz_socketpair on IPv6-only systems. Previously, the
IPv6 socket was bound using an address family of AF_INET instead
of AF_INET6. Fixes bug 28995; bugfix on 0.3.5.1-alpha. Patch from
Kris Katterjohn.
o Minor bugfixes (logging):
- Rework rep_hist_log_link_protocol_counts() to iterate through all
link protocol versions when logging incoming/outgoing connection
counts. Tor no longer skips version 5, and we won't have to
remember to update this function when new link protocol version is
developed. Fixes bug 28920; bugfix on 0.2.6.10.
o Minor bugfixes (networking):
- Introduce additional checks into tor_addr_parse() to reject
certain incorrect inputs that previously were not detected. Fixes
bug 23082; bugfix on 0.2.0.10-alpha.
o Minor bugfixes (onion service v3, client):
- Stop logging a "BUG()" warning and stacktrace when we find a SOCKS
connection waiting for a descriptor that we actually have in the
cache. It turns out that this can actually happen, though it is
rare. Now, tor will recover and retry the descriptor. Fixes bug
28669; bugfix on 0.3.2.4-alpha.
o Minor bugfixes (periodic events):
- Refrain from calling routerlist_remove_old_routers() from
check_descriptor_callback(). Instead, create a new hourly periodic
event. Fixes bug 27929; bugfix on 0.2.8.1-alpha.
o Minor bugfixes (pluggable transports):
- Make sure that data is continously read from standard output and
standard error pipes of a pluggable transport child-process, to
avoid deadlocking when a pipe's buffer is full. Fixes bug 26360;
bugfix on 0.2.3.6-alpha.
o Minor bugfixes (unit tests):
- Instead of relying on hs_free_all() to clean up all onion service
objects in test_build_descriptors(), we now deallocate them one by
one. This lets Coverity know that we are not leaking memory there
and fixes CID 1442277. Fixes bug 28989; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (usability):
- Stop saying "Your Guard ..." in pathbias_measure_{use,close}_rate().
Some users took this phrasing to mean that the mentioned guard was
under their control or responsibility, which it is not. Fixes bug
28895; bugfix on Tor 0.3.0.1-alpha.
o Code simplification and refactoring:
- Reimplement NETINFO cell parsing and generation to rely on
trunnel-generated wire format handling code. Closes ticket 27325.
- Remove unnecessary unsafe code from the Rust macro "cstr!". Closes
ticket 28077.
- Rework SOCKS wire format handling to rely on trunnel-generated
parsing/generation code. Resolves ticket 27620.
- Split out bootstrap progress reporting from control.c into a
separate file. Part of ticket 27402.
- The .may_include files that we use to describe our directory-by-
directory dependency structure now describe a noncircular
dependency graph over the directories that they cover. Our
checkIncludes.py tool now enforces this noncircularity. Closes
ticket 28362.
o Documentation:
- Mention that you cannot add a new onion service if Tor is already
running with Sandbox enabled. Closes ticket 28560.
- Improve ControlPort documentation. Mention that it accepts
address:port pairs, and can be used multiple times. Closes
ticket 28805.
- Document the exact output of "tor --version". Closes ticket 28889.
o Removed features:
- Stop responding to the 'GETINFO status/version/num-concurring' and
'GETINFO status/version/num-versioning' control port commands, as
those were deprecated back in 0.2.0.30. Also stop listing them in
output of 'GETINFO info/names'. Resolves ticket 28757.
- The scripts used to generate and maintain the list of fallback
directories have been extracted into a new "fallback-scripts"
repository. Closes ticket 27914.
o Testing:
- Run shellcheck for scripts in the in scripts/ directory. Closes
ticket 28058.
- Add unit tests for tokenize_string() and get_next_token()
functions. Resolves ticket 27625.
o Code simplification and refactoring (onion service v3):
- Consolidate the authorized client descriptor cookie computation
code from client and service into one function. Closes
ticket 27549.
o Code simplification and refactoring (shell scripts):
- Cleanup scan-build.sh to silence shellcheck warnings. Closes
ticket 28007.
- Fix issues that shellcheck found in chutney-git-bisect.sh.
Resolves ticket 28006.
- Fix issues that shellcheck found in updateRustDependencies.sh.
Resolves ticket 28012.
- Fix shellcheck warnings in cov-diff script. Resolves issue 28009.
- Fix shellcheck warnings in run_calltool.sh. Resolves ticket 28011.
- Fix shellcheck warnings in run_trunnel.sh. Resolves issue 28010.
- Fix shellcheck warnings in scripts/test/coverage. Resolves
issue 28008.
Changes in version 0.3.3.11 - 2019-01-07
Tor 0.3.3.11 backports numerous fixes from later versions of Tor.
numerous fixes, including an important fix for anyone using OpenSSL
1.1.1. Anyone running an earlier version of Tor 0.3.3 should upgrade
to this version, or to a later series.
As a reminder, support the Tor 0.3.3 series will end on 22 Feb 2019.
We anticipate that this will be the last release of Tor 0.3.3, unless
some major bug is before then. Some time between now and then, users
should switch to either the Tor 0.3.4 series (supported until at least
10 June 2019), or the Tor 0.3.5 series, which will receive long-term
support until at least 1 Feb 2022.
o Major bugfixes (OpenSSL, portability, backport from 0.3.5.5-alpha):
- Fix our usage of named groups when running as a TLS 1.3 client in
OpenSSL 1.1.1. Previously, we only initialized EC groups when
running as a relay, which caused clients to fail to negotiate TLS
1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3
support was added).
o Major bugfixes (restart-in-process, backport from 0.3.5.1-alpha):
- Fix a use-after-free error that could be caused by passing Tor an
impossible set of options that would fail during options_act().
Fixes bug 27708; bugfix on 0.3.3.1-alpha.
o Minor features (continuous integration, backport from 0.3.5.1-alpha):
- Only run one online rust build in Travis, to reduce network
errors. Skip offline rust builds on Travis for Linux gcc, because
they're redundant. Implements ticket 27252.
- Skip gcc on OSX in Travis CI, because it's rarely used. Skip a
duplicate hardening-off build in Travis on Tor 0.2.9. Skip gcc on
Linux with default settings, because all the non-default builds
use gcc on Linux. Implements ticket 27252.
o Minor features (continuous integration, backport from 0.3.5.3-alpha):
- Use the Travis Homebrew addon to install packages on macOS during
Travis CI. The package list is the same, but the Homebrew addon
does not do a `brew update` by default. Implements ticket 27738.
o Minor features (fallback directory list, backport from 0.3.5.6-rc):
- Replace the 150 fallbacks originally introduced in Tor
0.3.3.1-alpha in January 2018 (of which ~115 were still
functional), with a list of 157 fallbacks (92 new, 65 existing, 85
removed) generated in December 2018. Closes ticket 24803.
o Minor features (geoip):
- Update geoip and geoip6 to the January 3 2019 Maxmind GeoLite2
Country database. Closes ticket 29012.
o Minor features (OpenSSL bug workaround, backport from 0.3.5.7):
- Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3
key export function from handling long labels. When this bug is
detected, Tor will disable TLS 1.3. We recommend upgrading to a
version of OpenSSL without this bug when it becomes available.
Closes ticket 28973.
o Minor bugfixes (relay statistics, backport from 0.3.5.7):
- Update relay descriptor on bandwidth changes only when the uptime
is smaller than 24h, in order to reduce the efficiency of guard
discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha.
o Minor bugfixes (C correctness, backport from 0.3.5.4-alpha):
- Avoid undefined behavior in an end-of-string check when parsing
the BEGIN line in a directory object. Fixes bug 28202; bugfix
on 0.2.0.3-alpha.
o Minor bugfixes (code safety, backport from 0.3.5.3-alpha):
- Rewrite our assertion macros so that they no longer suppress the
compiler's -Wparentheses warnings. Fixes bug 27709; bugfix
o Minor bugfixes (compilation, backport from 0.3.5.5-alpha):
- Initialize a variable unconditionally in aes_new_cipher(), since
some compilers cannot tell that we always initialize it before
use. Fixes bug 28413; bugfix on 0.2.9.3-alpha.
o Minor bugfixes (directory authority, backport from 0.3.5.4-alpha):
- Log additional info when we get a relay that shares an ed25519 ID
with a different relay, instead making a BUG() warning. Fixes bug
27800; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (directory permissions, backport form 0.3.5.3-alpha):
- When a user requests a group-readable DataDirectory, give it to
them. Previously, when the DataDirectory and the CacheDirectory
were the same, the default setting (0) for
CacheDirectoryGroupReadable would override the setting for
DataDirectoryGroupReadable. Fixes bug 26913; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (onion service v3, backport from 0.3.5.1-alpha):
- When the onion service directory can't be created or has the wrong
permissions, do not log a stack trace. Fixes bug 27335; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (onion service v3, backport from 0.3.5.2-alpha):
- Close all SOCKS request (for the same .onion) if the newly fetched
descriptor is unusable. Before that, we would close only the first
one leaving the other hanging and let to time out by themselves.
Fixes bug 27410; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha):
- Don't warn so loudly when Tor is unable to decode an onion
descriptor. This can now happen as a normal use case if a client
gets a descriptor with client authorization but the client is not
authorized. Fixes bug 27550; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (onion service v3, backport from 0.3.5.6-rc):
- When deleting an ephemeral onion service (DEL_ONION), do not close
any rendezvous circuits in order to let the existing client
connections finish by themselves or closed by the application. The
HS v2 is doing that already so now we have the same behavior for
all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (HTTP tunnel):
- Fix a bug warning when closing an HTTP tunnel connection due to
an HTTP request we couldn't handle. Fixes bug 26470; bugfix on
0.3.2.1-alpha.
o Minor bugfixes (memory leaks, backport from 0.3.5.5-alpha):
- Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419;
bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger.
o Minor bugfixes (netflow padding, backport from 0.3.5.1-alpha):
- Ensure circuitmux queues are empty before scheduling or sending
padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (protover, backport from 0.3.5.3-alpha):
- Reject protocol names containing bytes other than alphanumeric
characters and hyphens ([A-Za-z0-9-]). Fixes bug 27316; bugfix
on 0.2.9.4-alpha.
o Minor bugfixes (rust, backport from 0.3.5.1-alpha):
- Compute protover votes correctly in the rust version of the
protover code. Previously, the protover rewrite in 24031 allowed
repeated votes from the same voter for the same protocol version
to be counted multiple times in protover_compute_vote(). Fixes bug
27649; bugfix on 0.3.3.5-rc.
- Reject protover names that contain invalid characters. Fixes bug
27687; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (rust, backport from 0.3.5.2-alpha):
- protover_all_supported() would attempt to allocate up to 16GB on
some inputs, leading to a potential memory DoS. Fixes bug 27206;
bugfix on 0.3.3.5-rc.
o Minor bugfixes (rust, backport from 0.3.5.4-alpha):
- Fix a potential null dereference in protover_all_supported(). Add
a test for it. Fixes bug 27804; bugfix on 0.3.3.1-alpha.
- Return a string that can be safely freed by C code, not one
created by the rust allocator, in protover_all_supported(). Fixes
bug 27740; bugfix on 0.3.3.1-alpha.
- Fix an API mismatch in the rust implementation of
protover_compute_vote(). This bug could have caused crashes on any
directory authorities running Tor with Rust (which we do not yet
recommend). Fixes bug 27741; bugfix on 0.3.3.6.
o Minor bugfixes (testing, backport from 0.3.5.1-alpha):
- If a unit test running in a subprocess exits abnormally or with a
nonzero status code, treat the test as having failed, even if the
test reported success. Without this fix, memory leaks don't cause
the tests to fail, even with LeakSanitizer. Fixes bug 27658;
bugfix on 0.2.2.4-alpha.
o Minor bugfixes (testing, backport from 0.3.5.4-alpha):
- Treat backtrace test failures as expected on BSD-derived systems
(NetBSD, OpenBSD, and macOS/Darwin) until we solve bug 17808.
(FreeBSD failures have been treated as expected since 18204 in
0.2.8.) Fixes bug 27948; bugfix on 0.2.5.2-alpha.
o Minor bugfixes (unit tests, guard selection, backport from 0.3.5.6-rc):
- Stop leaking memory in an entry guard unit test. Fixes bug 28554;
bugfix on 0.3.0.1-alpha.
Changes in version 0.3.4.10 - 2019-01-07
Tor 0.3.4.9 is the second stable release in its series; it backports
numerous fixes, including an important fix for relays, and for anyone
using OpenSSL 1.1.1. Anyone running an earlier version of Tor 0.3.4
should upgrade.
As a reminder, the Tor 0.3.4 series will be supported until 10 June
2019. Some time between now and then, users should switch to the Tor
0.3.5 series, which will receive long-term support until at least 1
Feb 2022.
o Major bugfixes (OpenSSL, portability, backport from 0.3.5.5-alpha):
- Fix our usage of named groups when running as a TLS 1.3 client in
OpenSSL 1.1.1. Previously, we only initialized EC groups when
running as a relay, which caused clients to fail to negotiate TLS
1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3
support was added).
o Major bugfixes (relay, directory, backport from 0.3.5.7):
- Always reactivate linked connections in the main loop so long as
any linked connection has been active. Previously, connections
serving directory information wouldn't get reactivated after the
first chunk of data was sent (usually 32KB), which would prevent
clients from bootstrapping. Fixes bug 28912; bugfix on
0.3.4.1-alpha. Patch by "cypherpunks3".
o Minor features (continuous integration, Windows, backport from 0.3.5.6-rc):
- Always show the configure and test logs, and upload them as build
artifacts, when building for Windows using Appveyor CI.
Implements 28459.
o Minor features (controller, backport from 0.3.5.1-alpha):
- For purposes of CIRC_BW-based dropped cell detection, track half-
closed stream ids, and allow their ENDs, SENDMEs, DATA and path
bias check cells to arrive without counting it as dropped until
either the END arrives, or the windows are empty. Closes
ticket 25573.
o Minor features (fallback directory list, backport from 0.3.5.6-rc):
- Replace the 150 fallbacks originally introduced in Tor
0.3.3.1-alpha in January 2018 (of which ~115 were still
functional), with a list of 157 fallbacks (92 new, 65 existing, 85
removed) generated in December 2018. Closes ticket 24803.
o Minor features (geoip):
- Update geoip and geoip6 to the November 6 2018 Maxmind GeoLite2
Country database. Closes ticket 28395.
o Minor features (OpenSSL bug workaround, backport from 0.3.5.7):
- Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3
key export function from handling long labels. When this bug is
detected, Tor will disable TLS 1.3. We recommend upgrading to a
version of OpenSSL without this bug when it becomes available.
Closes ticket 28973.
o Minor bugfixes (compilation, backport from 0.3.5.5-alpha):
- Initialize a variable unconditionally in aes_new_cipher(), since
some compilers cannot tell that we always initialize it before
use. Fixes bug 28413; bugfix on 0.2.9.3-alpha.
o Minor bugfixes (connection, relay, backport from 0.3.5.5-alpha):
- Avoid a logging a BUG() stacktrace when closing connection held
open because the write side is rate limited but not the read side.
Now, the connection read side is simply shut down until Tor is
able to flush the connection and close it. Fixes bug 27750; bugfix
on 0.3.4.1-alpha.
o Minor bugfixes (continuous integration, Windows, backport from 0.3.5.5-alpha):
- Manually configure the zstd compiler options, when building using
mingw on Appveyor Windows CI. The MSYS2 mingw zstd package does
not come with a pkg-config file. Fixes bug 28454; bugfix
on 0.3.4.1-alpha.
- Stop using an external OpenSSL install, and stop installing MSYS2
packages, when building using mingw on Appveyor Windows CI. Fixes
bug 28399; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (continuous integration, Windows, backport from 0.3.5.6-rc):
- Explicitly specify the path to the OpenSSL library and do not
download OpenSSL from Pacman, but instead use the library that is
already provided by AppVeyor. Fixes bug 28574; bugfix on master.
o Minor bugfixes (directory permissions, backport form 0.3.5.3-alpha):
- When a user requests a group-readable DataDirectory, give it to
them. Previously, when the DataDirectory and the CacheDirectory
were the same, the default setting (0) for
CacheDirectoryGroupReadable would override the setting for
DataDirectoryGroupReadable. Fixes bug 26913; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (memory leaks, backport from 0.3.5.5-alpha):
- Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419;
bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger.
o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha):
- Don't warn so loudly when Tor is unable to decode an onion
descriptor. This can now happen as a normal use case if a client
gets a descriptor with client authorization but the client is not
authorized. Fixes bug 27550; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (onion service v3, backport from 0.3.5.6-rc):
- When deleting an ephemeral onion service (DEL_ONION), do not close
any rendezvous circuits in order to let the existing client
connections finish by themselves or closed by the application. The
HS v2 is doing that already so now we have the same behavior for
all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (relay statistics, backport from 0.3.5.7):
- Update relay descriptor on bandwidth changes only when the uptime
is smaller than 24h, in order to reduce the efficiency of guard
discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha.
o Minor bugfixes (unit tests, guard selection, backport from 0.3.5.6-rc):
- Stop leaking memory in an entry guard unit test. Fixes bug 28554;
bugfix on 0.3.0.1-alpha.
Changes in version 0.3.5.7 - 2019-01-07
Tor 0.3.5.7 is the first stable release in its series; it includes
compilation and portability fixes, and a fix for a severe problem
affecting directory caches.
The Tor 0.3.5 series includes several new features and performance
improvements, including client authorization for v3 onion services,
cleanups to bootstrap reporting, support for improved bandwidth-
measurement tools, experimental support for NSS in place of OpenSSL,
and much more. It also begins a full reorganization of Tor's code
layout, for improved modularity and maintainability in the future.
Finally, there is the usual set of performance improvements and
bugfixes that we try to do in every release series.
There are a couple of changes in the 0.3.5 that may affect
compatibility. First, the default version for newly created onion
services is now v3. Use the HiddenServiceVersion option if you want to
override this. Second, some log messages related to bootstrapping have
changed; if you use stem, you may need to update to the latest version
so it will recognize them.
We have designated 0.3.5 as a "long-term support" (LTS) series: we
will continue to patch major bugs in typical configurations of 0.3.5
until at least 1 Feb 2022. (We do not plan to provide long-term
support for embedding, Rust support, NSS support, running a directory
authority, or unsupported platforms. For these, you will need to stick
with the latest stable release.)
Below are the changes since 0.3.5.6-rc. For a complete list of changes
since 0.3.4.9, see the ReleaseNotes file.
o Major bugfixes (relay, directory):
- Always reactivate linked connections in the main loop so long as
any linked connection has been active. Previously, connections
serving directory information wouldn't get reactivated after the
first chunk of data was sent (usually 32KB), which would prevent
clients from bootstrapping. Fixes bug 28912; bugfix on
0.3.4.1-alpha. Patch by "cypherpunks3".
o Minor features (compilation):
- When possible, place our warning flags in a separate file, to
avoid flooding verbose build logs. Closes ticket 28924.
o Minor features (geoip):
- Update geoip and geoip6 to the January 3 2019 Maxmind GeoLite2
Country database. Closes ticket 29012.
o Minor features (OpenSSL bug workaround):
- Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3
key export function from handling long labels. When this bug is
detected, Tor will disable TLS 1.3. We recommend upgrading to a
version of OpenSSL without this bug when it becomes available.
Closes ticket 28973.
o Minor features (performance):
- Remove about 96% of the work from the function that we run at
startup to test our curve25519_basepoint implementation. Since
this function has yet to find an actual failure, we now only run
it for 8 iterations instead of 200. Based on our profile
information, this change should save around 8% of our startup time
on typical desktops, and may have a similar effect on other
platforms. Closes ticket 28838.
- Stop re-validating our hardcoded Diffie-Hellman parameters on
every startup. Doing this wasted time and cycles, especially on
low-powered devices. Closes ticket 28851.
o Minor bugfixes (compilation):
- Fix compilation for Android by adding a missing header to
freespace.c. Fixes bug 28974; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (correctness):
- Fix an unreached code path where we checked the value of
"hostname" inside send_resolved_hostname_cell(). Previously, we
used it before checking it; now we check it first. Fixes bug
28879; bugfix on 0.1.2.7-alpha.
o Minor bugfixes (testing):
- Make sure that test_rebind.py actually obeys its timeout, even
when it receives a large number of log messages. Fixes bug 28883;
bugfix on 0.3.5.4-alpha.
- Stop running stem's unit tests as part of "make test-stem", but
continue to run stem's unit and online tests during "make test-
stem-full". Fixes bug 28568; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (windows services):
- Make Tor start correctly as an NT service again: previously it was
broken by refactoring. Fixes bug 28612; bugfix on 0.3.5.3-alpha.
o Code simplification and refactoring:
- When parsing a port configuration, make it more obvious to static
analyzer tools that we always initialize the address. Closes
ticket 28881.
Changes in version 0.3.5.6-rc - 2018-12-18
Tor 0.3.5.6-rc fixes numerous small bugs in earlier versions of Tor.
It is the first release candidate in the 0.3.5.x series; if no further
huge bugs are found, our next release may be the stable 0.3.5.x.
o Minor features (continuous integration, Windows):
- Always show the configure and test logs, and upload them as build
artifacts, when building for Windows using Appveyor CI.
Implements 28459.
o Minor features (fallback directory list):
- Replace the 150 fallbacks originally introduced in Tor
0.3.3.1-alpha in January 2018 (of which ~115 were still
functional), with a list of 157 fallbacks (92 new, 65 existing, 85
removed) generated in December 2018. Closes ticket 24803.
o Minor features (geoip):
- Update geoip and geoip6 to the December 5 2018 Maxmind GeoLite2
Country database. Closes ticket 28744.
o Minor bugfixes (compilation):
- Add missing dependency on libgdi32.dll for tor-print-ed-signing-
cert.exe on Windows. Fixes bug 28485; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (continuous integration, Windows):
- Explicitly specify the path to the OpenSSL library and do not
download OpenSSL from Pacman, but instead use the library that is
already provided by AppVeyor. Fixes bug 28574; bugfix on master.
o Minor bugfixes (onion service v3):
- When deleting an ephemeral onion service (DEL_ONION), do not close
any rendezvous circuits in order to let the existing client
connections finish by themselves or closed by the application. The
HS v2 is doing that already so now we have the same behavior for
all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (restart-in-process, boostrap):
- Add missing resets of bootstrap tracking state when shutting down
(regression caused by ticket 27169). Fixes bug 28524; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (testing):
- Use a separate DataDirectory for the test_rebind script.
Previously, this script would run using the default DataDirectory,
and sometimes fail. Fixes bug 28562; bugfix on 0.3.5.1-alpha.
Patch from Taylor R Campbell.
- Stop leaking memory in an entry guard unit test. Fixes bug 28554;
bugfix on 0.3.0.1-alpha.
o Minor bugfixes (Windows):
- Correctly identify Windows 8.1, Windows 10, and Windows Server
2008 and later from their NT versions. Fixes bug 28096; bugfix on
0.2.2.34; reported by Keifer Bly.
- On recent Windows versions, the GetVersionEx() function may report
an earlier Windows version than the running OS. To avoid user
confusion, add "[or later]" to Tor's version string on affected
versions of Windows. Fixes bug 28096; bugfix on 0.2.2.34; reported
by Keifer Bly.
- Remove Windows versions that were never supported by the
GetVersionEx() function. Stop duplicating the latest Windows
version in get_uname(). Fixes bug 28096; bugfix on 0.2.2.34;
reported by Keifer Bly.
o Testing:
- Increase logging and tag all log entries with timestamps in
test_rebind.py. Provides diagnostics for issue 28229.
o Code simplification and refactoring (shared random, dirauth):
- Change many tor_assert() to use BUG() instead. The idea is to not
crash a dirauth but rather scream loudly with a stacktrace and let
it continue run. The shared random subsystem is very resilient and
if anything wrong happens with it, at worst a non coherent value
will be put in the vote and discarded by the other authorities.
Closes ticket 19566.
o Documentation (onion services):
- Document in the man page that changing ClientOnionAuthDir value or
adding a new file in the directory will not work at runtime upon
sending a HUP if Sandbox 1. Closes ticket 28128.
- Note in the man page that the only real way to fully revoke an
onion service v3 client authorization is by restarting the tor
process. Closes ticket 28275.
Changes in version 0.3.5.5-alpha - 2018-11-16
Tor 0.3.5.5-alpha includes numerous bugfixes on earlier releases,
including several that we hope to backport to older release series in
the future.
o Major bugfixes (OpenSSL, portability):
- Fix our usage of named groups when running as a TLS 1.3 client in
OpenSSL 1.1.1. Previously, we only initialized EC groups when
running as a relay, which caused clients to fail to negotiate TLS
1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3
support was added).
o Minor features (geoip):
- Update geoip and geoip6 to the November 6 2018 Maxmind GeoLite2
Country database. Closes ticket 28395.
o Minor bugfixes (compilation):
- Initialize a variable unconditionally in aes_new_cipher(), since
some compilers cannot tell that we always initialize it before
use. Fixes bug 28413; bugfix on 0.2.9.3-alpha.
o Minor bugfixes (connection, relay):
- Avoid a logging a BUG() stacktrace when closing connection held
open because the write side is rate limited but not the read side.
Now, the connection read side is simply shut down until Tor is
able to flush the connection and close it. Fixes bug 27750; bugfix
on 0.3.4.1-alpha.
o Minor bugfixes (continuous integration, Windows):
- Manually configure the zstd compiler options, when building using
mingw on Appveyor Windows CI. The MSYS2 mingw zstd package does
not come with a pkg-config file. Fixes bug 28454; bugfix
on 0.3.4.1-alpha.
- Stop using an external OpenSSL install, and stop installing MSYS2
packages, when building using mingw on Appveyor Windows CI. Fixes
bug 28399; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (documentation):
- Make Doxygen work again after the code movement in the 0.3.5
source tree. Fixes bug 28435; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (Linux seccomp2 sandbox):
- Permit the "shutdown()" system call, which is apparently used by
OpenSSL under some circumstances. Fixes bug 28183; bugfix
on 0.2.5.1-alpha.
o Minor bugfixes (logging):
- Stop talking about the Named flag in log messages. Clients have
ignored the Named flag since 0.3.2. Fixes bug 28441; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (memory leaks):
- Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419;
bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger.
o Minor bugfixes (onion services):
- On an intro point for a version 3 onion service, stop closing
introduction circuits on an NACK. This lets the client decide
whether to reuse the circuit or discard it. Previously, we closed
intro circuits when sending NACKs. Fixes bug 27841; bugfix on
0.3.2.1-alpha. Patch by Neel Chaunan.
- When replacing a descriptor in the client cache, make sure to
close all client introduction circuits for the old descriptor, so
we don't end up with unusable leftover circuits. Fixes bug 27471;
bugfix on 0.3.2.1-alpha.
Changes in version 0.3.5.4-alpha - 2018-11-08
Tor 0.3.5.4-alpha includes numerous bugfixes on earlier versions and
improves our continuous integration support. It continues our attempts
to stabilize this alpha branch and build it into a foundation for an
acceptable long-term-support release.
o Major bugfixes (compilation, rust):
- Rust tests can now build and run successfully with the
--enable-fragile-hardening option enabled. Doing this currently
requires the rust beta channel; it will be possible with stable
rust once Rust version 1.31 is released. Patch from Alex Crichton.
Fixes bugs 27272, 27273, and 27274. Bugfix on 0.3.1.1-alpha.
o Major bugfixes (embedding, main loop):
- When DisableNetwork becomes set, actually disable periodic events
that are already enabled. (Previously, we would refrain from
enabling new ones, but we would leave the old ones turned on.)
Fixes bug 28348; bugfix on 0.3.4.1-alpha.
o Minor features (continuous integration):
- Add a Travis CI build for --enable-nss on Linux gcc. Closes
ticket 27751.
- Add new CI job to Travis configuration to run stem-based
integration tests. Closes ticket 27913.
o Minor features (Windows, continuous integration):
- Build tor on Windows Server 2012 R2 and Windows Server 2016 using
Appveyor's CI. Closes ticket 28318.
o Minor bugfixes (C correctness, also in 0.3.4.9):
- Avoid undefined behavior in an end-of-string check when parsing
the BEGIN line in a directory object. Fixes bug 28202; bugfix
on 0.2.0.3-alpha.
o Minor bugfixes (compilation):
- Fix a pair of missing headers on OpenBSD. Fixes bug 28303; bugfix
on 0.3.5.1-alpha. Patch from Kris Katterjohn.
o Minor bugfixes (compilation, OpenSolaris):
- Fix compilation on OpenSolaris and its descendants by adding a
missing include to compat_pthreads.c. Fixes bug 27963; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (configuration):
- Refuse to start with relative file paths and RunAsDaemon set
(regression from the fix for bug 22731). Fixes bug 28298; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (directory authority, also in 0.3.4.9):
- Log additional info when we get a relay that shares an ed25519 ID
with a different relay, instead of a BUG() warning with a
backtrace. Fixes bug 27800; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (onion service v3):
- Build the service descriptor's signing key certificate before
uploading, so we always have a fresh one: leaving no chances for
it to expire service side. Fixes bug 27838; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (onion service v3, client authorization):
- Fix an assert() when adding a client authorization for the first
time and then sending a HUP signal to the service. Before that,
Tor would stop abruptly. Fixes bug 27995; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (onion services):
- Unless we have explicitly set HiddenServiceVersion, detect the
onion service version and then look for invalid options.
Previously, we did the reverse, but that broke existing configs
which were pointed to a v2 service and had options like
HiddenServiceAuthorizeClient set. Fixes bug 28127; bugfix on
0.3.5.1-alpha. Patch by Neel Chauhan.
o Minor bugfixes (portability):
- Make the OPE code (which is used for v3 onion services) run
correctly on big-endian platforms. Fixes bug 28115; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (protover, rust):
- Reject extra commas in version strings. Fixes bug 27197; bugfix
on 0.3.3.3-alpha.
o Minor bugfixes (relay shutdown, systemd):
- Notify systemd of ShutdownWaitLength so it can be set to longer
than systemd's TimeoutStopSec. In Tor's systemd service file, set
TimeoutSec to 60 seconds to allow Tor some time to shut down.
Fixes bug 28113; bugfix on 0.2.6.2-alpha.
o Minor bugfixes (rust, also in 0.3.4.9):
- Fix a potential null dereference in protover_all_supported(). Add
a test for it. Fixes bug 27804; bugfix on 0.3.3.1-alpha.
- Return a string that can be safely freed by C code, not one
created by the rust allocator, in protover_all_supported(). Fixes
bug 27740; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (rust, directory authority, also in 0.3.4.9):
- Fix an API mismatch in the rust implementation of
protover_compute_vote(). This bug could have caused crashes on any
directory authorities running Tor with Rust (which we do not yet
recommend). Fixes bug 27741; bugfix on 0.3.3.6.
o Minor bugfixes (testing):
- Avoid hangs and race conditions in test_rebind.py. Fixes bug
27968; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (testing, also in 0.3.4.9):
- Treat backtrace test failures as expected on BSD-derived systems
(NetBSD, OpenBSD, and macOS/Darwin) until we solve bug 17808.
(FreeBSD failures have been treated as expected since 18204 in
0.2.8.) Fixes bug 27948; bugfix on 0.2.5.2-alpha.
o Documentation (onion service manpage):
- Improve HSv3 client authorization by making some options more
explicit and detailed. Closes ticket 28026. Patch by Mike Tigas.
Changes in version 0.3.4.9 - 2018-11-02
Tor 0.3.4.9 is the second stable release in its series; it backports
numerous fixes, including a fix for a bandwidth management bug that
was causing memory exhaustion on relays. Anyone running an earlier
version of Tor 0.3.4.9 should upgrade.
o Major bugfixes (compilation, backport from 0.3.5.3-alpha):
- Fix compilation on ARM (and other less-used CPUs) when compiling
with OpenSSL before 1.1. Fixes bug 27781; bugfix on 0.3.4.1-alpha.
o Major bugfixes (mainloop, bootstrap, backport from 0.3.5.3-alpha):
- Make sure Tor bootstraps and works properly if only the
ControlPort is set. Prior to this fix, Tor would only bootstrap
when a client port was set (Socks, Trans, NATD, DNS or HTTPTunnel
port). Fixes bug 27849; bugfix on 0.3.4.1-alpha.
o Major bugfixes (relay, backport from 0.3.5.3-alpha):
- When our write bandwidth limit is exhausted, stop writing on the
connection. Previously, we had a typo in the code that would make
us stop reading instead, leading to relay connections being stuck
indefinitely and consuming kernel RAM. Fixes bug 28089; bugfix
on 0.3.4.1-alpha.
o Major bugfixes (restart-in-process, backport from 0.3.5.1-alpha):
- Fix a use-after-free error that could be caused by passing Tor an
impossible set of options that would fail during options_act().
Fixes bug 27708; bugfix on 0.3.3.1-alpha.
o Minor features (continuous integration, backport from 0.3.5.1-alpha):
- Don't do a distcheck with --disable-module-dirauth in Travis.
Implements ticket 27252.
- Only run one online rust build in Travis, to reduce network
errors. Skip offline rust builds on Travis for Linux gcc, because
they're redundant. Implements ticket 27252.
- Skip gcc on OSX in Travis CI, because it's rarely used. Skip a
duplicate hardening-off build in Travis on Tor 0.2.9. Skip gcc on
Linux with default settings, because all the non-default builds
use gcc on Linux. Implements ticket 27252.
o Minor features (continuous integration, backport from 0.3.5.3-alpha):
- Use the Travis Homebrew addon to install packages on macOS during
Travis CI. The package list is the same, but the Homebrew addon
does not do a `brew update` by default. Implements ticket 27738.
o Minor features (geoip):
- Update geoip and geoip6 to the October 9 2018 Maxmind GeoLite2
Country database. Closes ticket 27991.
o Minor bugfixes (32-bit OSX and iOS, timing, backport from 0.3.5.2-alpha):
- Fix an integer overflow bug in our optimized 32-bit millisecond-
difference algorithm for 32-bit Apple platforms. Previously, it
would overflow when calculating the difference between two times
more than 47 days apart. Fixes part of bug 27139; bugfix
on 0.3.4.1-alpha.
- Improve the precision of our 32-bit millisecond difference
algorithm for 32-bit Apple platforms. Fixes part of bug 27139;
bugfix on 0.3.4.1-alpha.
- Relax the tolerance on the mainloop/update_time_jumps test when
running on 32-bit Apple platforms. Fixes part of bug 27139; bugfix
on 0.3.4.1-alpha.
o Minor bugfixes (C correctness, to appear in 0.3.5.4-alpha):
- Avoid undefined behavior in an end-of-string check when parsing
the BEGIN line in a directory object. Fixes bug 28202; bugfix
on 0.2.0.3-alpha.
o Minor bugfixes (CI, appveyor, to appear in 0.3.5.4-alpha):
- Only install the necessary mingw packages during our appveyor
builds. This change makes the build a little faster, and prevents
a conflict with a preinstalled mingw openssl that appveyor now
ships. Fixes bugs 27943 and 27765; bugfix on 0.3.4.2-alpha.
o Minor bugfixes (code safety, backport from 0.3.5.3-alpha):
- Rewrite our assertion macros so that they no longer suppress the
compiler's -Wparentheses warnings. Fixes bug 27709; bugfix
o Minor bugfixes (continuous integration, backport from 0.3.5.1-alpha):
- Stop reinstalling identical packages in our Windows CI. Fixes bug
27464; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (directory authority, to appear in 0.3.5.4-alpha):
- Log additional info when we get a relay that shares an ed25519 ID
with a different relay, instead making a BUG() warning. Fixes bug
27800; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (directory connection shutdown, backport from 0.3.5.1-alpha):
- Avoid a double-close when shutting down a stalled directory
connection. Fixes bug 26896; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (HTTP tunnel, backport from 0.3.5.1-alpha):
- Fix a bug warning when closing an HTTP tunnel connection due to an
HTTP request we couldn't handle. Fixes bug 26470; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (netflow padding, backport from 0.3.5.1-alpha):
- Ensure circuitmux queues are empty before scheduling or sending
padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (onion service v3, backport from 0.3.5.1-alpha):
- When the onion service directory can't be created or has the wrong
permissions, do not log a stack trace. Fixes bug 27335; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (onion service v3, backport from 0.3.5.2-alpha):
- Close all SOCKS request (for the same .onion) if the newly fetched
descriptor is unusable. Before that, we would close only the first
one leaving the other hanging and let to time out by themselves.
Fixes bug 27410; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha):
- When selecting a v3 rendezvous point, don't only look at the
protover, but also check whether the curve25519 onion key is
present. This way we avoid picking a relay that supports the v3
rendezvous but for which we don't have the microdescriptor. Fixes
bug 27797; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (protover, backport from 0.3.5.3-alpha):
- Reject protocol names containing bytes other than alphanumeric
characters and hyphens ([A-Za-z0-9-]). Fixes bug 27316; bugfix
on 0.2.9.4-alpha.
o Minor bugfixes (rust, backport from 0.3.5.1-alpha):
- Compute protover votes correctly in the rust version of the
protover code. Previously, the protover rewrite in 24031 allowed
repeated votes from the same voter for the same protocol version
to be counted multiple times in protover_compute_vote(). Fixes bug
27649; bugfix on 0.3.3.5-rc.
- Reject protover names that contain invalid characters. Fixes bug
27687; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (rust, backport from 0.3.5.2-alpha):
- protover_all_supported() would attempt to allocate up to 16GB on
some inputs, leading to a potential memory DoS. Fixes bug 27206;
bugfix on 0.3.3.5-rc.
o Minor bugfixes (rust, directory authority, to appear in 0.3.5.4-alpha):
- Fix an API mismatch in the rust implementation of
protover_compute_vote(). This bug could have caused crashes on any
directory authorities running Tor with Rust (which we do not yet
recommend). Fixes bug 27741; bugfix on 0.3.3.6.
o Minor bugfixes (rust, to appear in 0.3.5.4-alpha):
- Fix a potential null dereference in protover_all_supported(). Add
a test for it. Fixes bug 27804; bugfix on 0.3.3.1-alpha.
- Return a string that can be safely freed by C code, not one
created by the rust allocator, in protover_all_supported(). Fixes
bug 27740; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (testing, backport from 0.3.5.1-alpha):
- If a unit test running in a subprocess exits abnormally or with a
nonzero status code, treat the test as having failed, even if the
test reported success. Without this fix, memory leaks don't cause
the tests to fail, even with LeakSanitizer. Fixes bug 27658;
bugfix on 0.2.2.4-alpha.
o Minor bugfixes (testing, backport from 0.3.5.3-alpha):
- Make the hs_service tests use the same time source when creating
the introduction point and when testing it. Now tests work better
on very slow systems like ARM or Travis. Fixes bug 27810; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (testing, to appear in 0.3.5.4-alpha):
- Treat backtrace test failures as expected on BSD-derived systems
(NetBSD, OpenBSD, and macOS/Darwin) until we solve bug 17808.
(FreeBSD failures have been treated as expected since 18204 in
0.2.8.) Fixes bug 27948; bugfix on 0.2.5.2-alpha.
Changes in version 0.3.5.3-alpha - 2018-10-17
Tor 0.3.5.3-alpha fixes several bugs, mostly from previous 0.3.5.x
versions. One important fix for relays addresses a problem with rate-
limiting code from back in 0.3.4.x: If the fix works out, we'll be
backporting it soon. This release is still an alpha, but we hope it's
getting closer and closer to stability.
o Major features (onion services):
- Version 3 onion services can now use the per-service
HiddenServiceExportCircuitID option to differentiate client
circuits. It communicates with the service by using the HAProxy
protocol to assign virtual IP addresses to inbound client
circuits. Closes ticket 4700. Patch by Mahrud Sayrafi.
o Major bugfixes (compilation):
- Fix compilation on ARM (and other less-used CPUs) when compiling
with OpenSSL before 1.1. Fixes bug 27781; bugfix on 0.3.4.1-alpha.
o Major bugfixes (initialization, crash):
- Fix an assertion crash that would stop Tor from starting up if it
tried to activate a periodic event too early. Fixes bug 27861;
bugfix on 0.3.5.1-alpha.
o Major bugfixes (mainloop, bootstrap):
- Make sure Tor bootstraps and works properly if only the
ControlPort is set. Prior to this fix, Tor would only bootstrap
when a client port was set (Socks, Trans, NATD, DNS or HTTPTunnel
port). Fixes bug 27849; bugfix on 0.3.4.1-alpha.
o Major bugfixes (relay):
- When our write bandwidth limit is exhausted, stop writing on the
connection. Previously, we had a typo in the code that would make
us stop reading instead, leading to relay connections being stuck
indefinitely and consuming kernel RAM. Fixes bug 28089; bugfix
on 0.3.4.1-alpha.
o Minor features (continuous integration):
- Use the Travis Homebrew addon to install packages on macOS during
Travis CI. The package list is the same, but the Homebrew addon
does not do a `brew update` by default. Implements ticket 27738.
- Report what program produced the mysterious core file that we
occasionally see on Travis CI during make distcheck. Closes
ticket 28024.
o Minor features (geoip):
- Update geoip and geoip6 to the October 9 2018 Maxmind GeoLite2
Country database. Closes ticket 27991.
o Minor bugfixes (code safety):
- Rewrite our assertion macros so that they no longer suppress the
compiler's -Wparentheses warnings. Fixes bug 27709; bugfix
on 0.0.6.
o Minor bugfixes (compilation):
- Compile the ed25519-donna code with a correct declaration of
crypto_strongest_rand(). Previously, we built it with one type,
but linked it against another in the unit tests, which caused
compilation failures with LTO enabled. This could have caused
other undefined behavior in the tests. Fixes bug 27728; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (compilation, netbsd):
- Add a missing include back into procmon.c. Fixes bug 27990; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (continuous integration, appveyor):
- Install only the necessary mingw packages during our appveyor
builds. This change makes the build a little faster, and prevents
a conflict with a preinstalled mingw openssl that appveyor now
ships. Fixes bugs 27765 and 27943; bugfix on 0.3.4.2-alpha.
o Minor bugfixes (directory permissions):
- When a user requests a group-readable DataDirectory, give it to
them. Previously, when the DataDirectory and the CacheDirectory
were the same, the default setting (0) for
CacheDirectoryGroupReadable would override the setting for
DataDirectoryGroupReadable. Fixes bug 26913; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (memory leaks):
- Fix a small memory leak when calling Tor with --dump-config. Fixes
bug 27893; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (networking):
- In retry_listeners_ports(), make sure that we're removing a member
of old_conns smartlist at most once. Fixes bug 27808; bugfix
on 0.3.5.1-alpha.
- Refrain from attempting socket rebinding when old and new
listeners are in different address families. Fixes bug 27928;
bugfix on 0.3.5.1-alpha.
o Minor bugfixes (onion service v3):
- Stop dumping a stack trace when trying to connect to an intro
point without having a descriptor for it. Fixes bug 27774; bugfix
on 0.3.2.1-alpha.
- Don't warn so loudly when Tor is unable to decode an onion
descriptor. This can now happen as a normal use case if a client
gets a descriptor with client authorization but the client is not
authorized. Fixes bug 27550; bugfix on 0.3.5.1-alpha.
- When selecting a v3 rendezvous point, don't only look at the
protover, but also check whether the curve25519 onion key is
present. This way we avoid picking a relay that supports the v3
rendezvous but for which we don't have the microdescriptor. Fixes
bug 27797; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (protover):
- Reject protocol names containing bytes other than alphanumeric
characters and hyphens ([A-Za-z0-9-]). Fixes bug 27316; bugfix
on 0.2.9.4-alpha.
o Minor bugfixes (testing):
- Make the hs_service tests use the same time source when creating
the introduction point and when testing it. Now tests work better
on very slow systems like ARM or Travis. Fixes bug 27810; bugfix
on 0.3.2.1-alpha.
- In test_rebind.py, check if the Python version is in the supported
range. Fixes bug 27675; bugfix on 0.3.5.1-alpha.
o Code simplification and refactoring:
- Divide more large Tor source files -- especially ones that span
multiple areas of functionality -- into smaller parts, including
onion.c and main.c. Closes ticket 26747.
- Divide the "routerparse.c" module into separate modules for each
group of parsed objects. Closes ticket 27924.
- Move protover_rust.c to the same place protover.c was moved to.
Closes ticket 27814.
- Split directory.c into separate pieces for client, server, and
common functionality. Closes ticket 26744.
- Split the non-statistics-related parts from the rephist.c and
geoip.c modules. Closes ticket 27892.
- Split the router.c file into relay-only and shared components, to
help with future modularization. Closes ticket 27864.
o Documentation:
- In the tor-resolve(1) manpage, fix the reference to socks-
extensions.txt by adding a web URL. Resolves ticket 27853.
- Mention that we require Python to be 2.7 or newer for some
integration tests that we ship with Tor. Resolves ticket 27677.
Changes in version 0.3.5.2-alpha - 2018-09-21
Tor 0.3.5.2-alpha fixes several bugs in 0.3.5.1-alpha, including one
that made Tor think it had run out of sockets. Anybody running a relay
or an onion service on 0.3.5.1-alpha should upgrade.
o Major bugfixes (relay bandwidth statistics):
- When we close relayed circuits, report the data in the circuit
queues as being written in our relay bandwidth stats. This
mitigates guard discovery and other attacks that close circuits
for the explicit purpose of noticing this discrepancy in
statistics. Fixes bug 23512; bugfix on 0.0.8pre3.
o Major bugfixes (socket accounting):
- In our socket accounting code, count a socket as closed even when
it is closed indirectly by the TLS layer. Previously, we would
count these sockets as still in use, and incorrectly believe that
we had run out of sockets. Fixes bug 27795; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (32-bit OSX and iOS, timing):
- Fix an integer overflow bug in our optimized 32-bit millisecond-
difference algorithm for 32-bit Apple platforms. Previously, it
would overflow when calculating the difference between two times
more than 47 days apart. Fixes part of bug 27139; bugfix
on 0.3.4.1-alpha.
- Improve the precision of our 32-bit millisecond difference
algorithm for 32-bit Apple platforms. Fixes part of bug 27139;
bugfix on 0.3.4.1-alpha.
- Relax the tolerance on the mainloop/update_time_jumps test when
running on 32-bit Apple platforms. Fixes part of bug 27139; bugfix
on 0.3.4.1-alpha.
o Minor bugfixes (onion service v3):
- Close all SOCKS request (for the same .onion) if the newly fetched
descriptor is unusable. Before that, we would close only the first
one leaving the other hanging and let to time out by themselves.
Fixes bug 27410; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (memory leak):
- Fix an unlikely memory leak when trying to read a private key from
a ridiculously large file. Fixes bug 27764; bugfix on
0.3.5.1-alpha. This is CID 1439488.
o Minor bugfixes (NSS):
- Correctly detect failure to open a dummy TCP socket when stealing
ownership of an fd from the NSS layer. Fixes bug 27782; bugfix
on 0.3.5.1-alpha.
o Minor bugfixes (rust):
- protover_all_supported() would attempt to allocate up to 16GB on
some inputs, leading to a potential memory DoS. Fixes bug 27206;
bugfix on 0.3.3.5-rc.
o Minor bugfixes (testing):
- Revise the "conditionvar_timeout" test so that it succeeds even on
heavily loaded systems where the test threads are not scheduled
within 200 msec. Fixes bug 27073; bugfix on 0.2.6.3-alpha.
o Code simplification and refactoring:
- Divide the routerlist.c and dirserv.c modules into smaller parts.
Closes ticket 27799.
Changes in version 0.3.5.1-alpha - 2018-09-18
Tor 0.3.5.1-alpha is the first release of the 0.3.5.x series. It adds
client authorization for modern (v3) onion services, improves
bootstrap reporting, begins reorganizing Tor's codebase, adds optional
support for NSS in place of OpenSSL, and much more.
o Major features (onion services, UI change):
- For a newly created onion service, the default version is now 3.
Tor still supports existing version 2 services, but the operator
now needs to set "HiddenServiceVersion 2" in order to create a new
version 2 service. For existing services, Tor now learns the
version by reading the key file. Closes ticket 27215.
o Major features (relay, UI change):
- Relays no longer run as exits by default. If the "ExitRelay"
option is auto (or unset), and no exit policy is specified with
ExitPolicy or ReducedExitPolicy, we now treat ExitRelay as 0.
Previously in this case, we allowed exit traffic and logged a
warning message. Closes ticket 21530. Patch by Neel Chauhan.
- Tor now validates that the ContactInfo config option is valid UTF-
8 when parsing torrc. Closes ticket 27428.
o Major features (bootstrap):
- Don't report directory progress until after a connection to a
relay or bridge has succeeded. Previously, we'd report 80%
progress based on cached directory information when we couldn't
even connect to the network. Closes ticket 27169.
o Major features (new code layout):
- Nearly all of Tor's source code has been moved around into more
logical places. The "common" directory is now divided into a set
of libraries in "lib", and files in the "or" directory have been
split into "core" (logic absolutely needed for onion routing),
"feature" (independent modules in Tor), and "app" (to configure
and invoke the rest of Tor). See doc/HACKING/CodeStructure.md for
more information. Closes ticket 26481.
This refactoring is not complete: although the libraries have been
refactored to be acyclic, the main body of Tor is still too
interconnected. We will attempt to improve this in the future.
o Major features (onion services v3):
- Implement onion service client authorization at the descriptor
level: only authorized clients can decrypt a service's descriptor
to find out how to contact it. A new torrc option was added to
control this client side: ClientOnionAuthDir <path>. On the
service side, if the "authorized_clients/" directory exists in the
onion service directory path, client configurations are read from
the files within. See the manpage for more details. Closes ticket
27547. Patch done by Suphanat Chunhapanya (haxxpop).
- Improve revision counter generation in next-gen onion services.
Onion services can now scale by hosting multiple instances on
different hosts without synchronization between them, which was
previously impossible because descriptors would get rejected by
HSDirs. Addresses ticket 25552.
o Major features (portability, cryptography, experimental, TLS):
- Tor now has the option to compile with the NSS library instead of
OpenSSL. This feature is experimental, and we expect that bugs may
remain. It is mainly intended for environments where Tor's
performance is not CPU-bound, and where NSS is already known to be
installed. To try it out, configure Tor with the --enable-nss
flag. Closes tickets 26631, 26815, and 26816.
If you are experimenting with this option and using an old cached
consensus, Tor may fail to start. To solve this, delete your
"cached-consensus" and "cached-microdesc-consensus" files,
(if present), and restart Tor.
o Major bugfixes (directory authority):
- Actually check that the address we get from DirAuthority
configuration line is valid IPv4. Explicitly disallow DirAuthority
address to be a DNS hostname. Fixes bug 26488; bugfix
on 0.1.2.10-rc.
o Major bugfixes (restart-in-process):
- Fix a use-after-free error that could be caused by passing Tor an
impossible set of options that would fail during options_act().
Fixes bug 27708; bugfix on 0.3.3.1-alpha.
o Minor features (admin tools):
- Add a new --key-expiration option to print the expiration date of
the signing cert in an ed25519_signing_cert file. Resolves
issue 19506.
o Minor features (build):
- If you pass the "--enable-pic" option to configure, Tor will try
to tell the compiler to build position-independent code suitable
to link into a dynamic library. (The default remains -fPIE, for
code suitable for a relocatable executable.) Closes ticket 23846.
o Minor features (code correctness, testing):
- Tor's build process now includes a "check-includes" make target to
verify that no module of Tor relies on any headers from a higher-
level module. We hope to use this feature over time to help
refactor our codebase. Closes ticket 26447.
o Minor features (code layout):
- We have a new "lowest-level" error-handling API for use by code
invoked from within the logging module. With this interface, the
logging code is no longer at risk of calling into itself if a
failure occurs while it is trying to log something. Closes
ticket 26427.
o Minor features (compilation):
- Tor's configure script now supports a --with-malloc= option to
select your malloc implementation. Supported options are
"tcmalloc", "jemalloc", "openbsd" (deprecated), and "system" (the
default). Addresses part of ticket 20424. Based on a patch from
Alex Xu.
o Minor features (config):
- The "auto" keyword in torrc is now case-insensitive. Closes
ticket 26663.
o Minor features (continuous integration):
- Don't do a distcheck with --disable-module-dirauth in Travis.
Implements ticket 27252.
- Install libcap-dev and libseccomp2-dev so these optional
dependencies get tested on Travis CI. Closes ticket 26560.
- Only run one online rust build in Travis, to reduce network
errors. Skip offline rust builds on Travis for Linux gcc, because
they're redundant. Implements ticket 27252.
- Skip gcc on OSX in Travis CI, because it's rarely used. Skip a
duplicate hardening-off build in Travis on Tor 0.2.9. Skip gcc on
Linux with default settings, because all the non-default builds
use gcc on Linux. Implements ticket 27252.
o Minor features (controller):
- Emit CIRC_BW events as soon as we detect that we processed an
invalid or otherwise dropped cell on a circuit. This allows
vanguards and other controllers to react more quickly to dropped
cells. Closes ticket 27678.
- For purposes of CIRC_BW-based dropped cell detection, track half-
closed stream ids, and allow their ENDs, SENDMEs, DATA and path
bias check cells to arrive without counting it as dropped until
either the END arrives, or the windows are empty. Closes
ticket 25573.
- Implement a 'GETINFO md/all' controller command to enable getting
all known microdescriptors. Closes ticket 8323.
- The GETINFO command now support an "uptime" argument, to return
Tor's uptime in seconds. Closes ticket 25132.
o Minor features (denial-of-service avoidance):
- Make our OOM handler aware of the DNS cache so that it doesn't
fill up the memory. This check is important for our DoS mitigation
subsystem. Closes ticket 18642. Patch by Neel Chauhan.
o Minor features (development):
- Tor's makefile now supports running the "clippy" Rust style tool
on our Rust code. Closes ticket 22156.
o Minor features (directory authority):
- There is no longer an artificial upper limit on the length of
bandwidth lines. Closes ticket 26223.
- When a bandwidth file is used to obtain the bandwidth measurements,
include this bandwidth file headers in the votes. Closes
ticket 3723.
- Improved support for networks with only a single authority or a
single fallback directory. Patch from Gabriel Somlo. Closes
ticket 25928.
o Minor features (embedding API):
- The Tor controller API now supports a function to launch Tor with
a preconstructed owning controller FD, so that embedding
applications don't need to manage controller ports and
authentication. Closes ticket 24204.
- The Tor controller API now has a function that returns the name
and version of the backend implementing the API. Closes
ticket 26947.
o Minor features (geoip):
- Update geoip and geoip6 to the September 6 2018 Maxmind GeoLite2
Country database. Closes ticket 27631.
o Minor features (memory management):
- Get Libevent to use the same memory allocator as Tor, by calling
event_set_mem_functions() during initialization. Resolves
ticket 8415.
o Minor features (memory usage):
- When not using them, store legacy TAP public onion keys in DER-
encoded format, rather than as expanded public keys. This should
save several megabytes on typical clients. Closes ticket 27246.
o Minor features (OpenSSL):
- When possible, use RFC5869 HKDF implementation from OpenSSL rather
than our own. Resolves ticket 19979.
o Minor features (Rust, code quality):
- Improve rust code quality in the rust protover implementation by
making it more idiomatic. Includes changing an internal API to
take &str instead of &String. Closes ticket 26492.
o Minor features (testing):
- Add scripts/test/chutney-git-bisect.sh, for bisecting using
chutney. Implements ticket 27211.
o Minor features (tor-resolve):
- The tor-resolve utility can now be used with IPv6 SOCKS proxies.
Side-effect of the refactoring for ticket 26526.
o Minor features (UI):
- Log each included configuration file or directory as we read it,
to provide more visibility about where Tor is reading from. Patch
from Unto Sten; closes ticket 27186.
- Lower log level of "Scheduler type KIST has been enabled" to INFO.
Closes ticket 26703.
o Minor bugfixes (bootstrap):
- Try harder to get descriptors in non-exit test networks, by using
the mid weight for the third hop when there are no exits. Fixes
bug 27237; bugfix on 0.2.6.2-alpha.
o Minor bugfixes (C correctness):
- Avoid casting smartlist index to int implicitly, as it may trigger
a warning (-Wshorten-64-to-32). Fixes bug 26282; bugfix on
0.2.3.13-alpha, 0.2.7.1-alpha and 0.2.1.1-alpha.
- Use time_t for all values in
predicted_ports_prediction_time_remaining(). Rework the code that
computes difference between durations/timestamps. Fixes bug 27165;
bugfix on 0.3.1.1-alpha.
o Minor bugfixes (client, memory usage):
- When not running as a directory cache, there is no need to store
the text of the current consensus networkstatus in RAM.
Previously, however, clients would store it anyway, at a cost of
over 5 MB. Now, they do not. Fixes bug 27247; bugfix
on 0.3.0.1-alpha.
o Minor bugfixes (client, reachableaddresses):
- Instead of adding a "reject *:*" line to ReachableAddresses when
loading the configuration, add one to the policy after parsing it
in parse_reachable_addresses(). This prevents extra "reject *.*"
lines from accumulating on reloads. Fixes bug 20874; bugfix on
0.1.1.5-alpha. Patch by Neel Chauhan.
o Minor bugfixes (code quality):
- Rename sandbox_getaddrinfo() and other functions to no longer
misleadingly suggest that they are sandbox-only. Fixes bug 26525;
bugfix on 0.2.7.1-alpha.
o Minor bugfixes (configuration, Onion Services):
- In rend_service_parse_port_config(), disallow any input to remain
after address-port pair was parsed. This will catch address and
port being whitespace-separated by mistake of the user. Fixes bug
27044; bugfix on 0.2.9.10.
o Minor bugfixes (continuous integration):
- Stop reinstalling identical packages in our Windows CI. Fixes bug
27464; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (controller):
- Consider all routerinfo errors other than "not a server" to be
transient for the purpose of "GETINFO exit-policy/*" controller
request. Print stacktrace in the unlikely case of failing to
recompute routerinfo digest. Fixes bug 27034; bugfix
on 0.3.4.1-alpha.
o Minor bugfixes (directory connection shutdown):
- Avoid a double-close when shutting down a stalled directory
connection. Fixes bug 26896; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (HTTP tunnel):
- Fix a bug warning when closing an HTTP tunnel connection due to an
HTTP request we couldn't handle. Fixes bug 26470; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (ipv6):
- In addrs_in_same_network_family(), we choose the subnet size based
on the IP version (IPv4 or IPv6). Previously, we chose a fixed
subnet size of /16 for both IPv4 and IPv6 addresses. Fixes bug
15518; bugfix on 0.2.3.1-alpha. Patch by Neel Chauhan.
o Minor bugfixes (logging):
- As a precaution, do an early return from log_addr_has_changed() if
Tor is running as client. Also, log a stack trace for debugging as
this function should only be called when Tor runs as server. Fixes
bug 26892; bugfix on 0.1.1.9-alpha.
- Refrain from mentioning bug 21018 in the logs, as it is already
fixed. Fixes bug 25477; bugfix on 0.2.9.8.
o Minor bugfixes (logging, documentation):
- When SafeLogging is enabled, scrub IP address in
channel_tls_process_netinfo_cell(). Also, add a note to manpage
that scrubbing is not guaranteed on loglevels below Notice. Fixes
bug 26882; bugfix on 0.2.4.10-alpha.
o Minor bugfixes (netflow padding):
- Ensure circuitmux queues are empty before scheduling or sending
padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (onion service v2):
- Log at level "info", not "warning", in the case that we do not
have a consensus when a .onion request comes in. This can happen
normally while bootstrapping. Fixes bug 27040; bugfix
on 0.2.8.2-alpha.
o Minor bugfixes (onion service v3):
- When the onion service directory can't be created or has the wrong
permissions, do not log a stack trace. Fixes bug 27335; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (OS compatibility):
- Properly handle configuration changes that move a listener to/from
wildcard IP address. If the first attempt to bind a socket fails,
close the old listener and try binding the socket again. Fixes bug
17873; bugfix on 0.0.8pre-1.
o Minor bugfixes (performance)::
- Rework node_is_a_configured_bridge() to no longer call
node_get_all_orports(), which was performing too many memory
allocations. Fixes bug 27224; bugfix on 0.2.3.9.
o Minor bugfixes (relay statistics):
- Update relay descriptor on bandwidth changes only when the uptime
is smaller than 24h, in order to reduce the efficiency of guard
discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha.
o Minor bugfixes (relays):
- Consider the fact that we'll be making direct connections to our
entry and guard nodes when computing the fraction of nodes that
have their descriptors. Also, if we are using bridges and there is
at least one bridge with a full descriptor, treat the fraction of
guards available as 100%. Fixes bug 25886; bugfix on 0.2.4.10-alpha.
Patch by Neel Chauhan.
- Update the message logged on relays when DirCache is disabled.
Since 0.3.3.5-rc, authorities require DirCache (V2Dir) for the
Guard flag. Fixes bug 24312; bugfix on 0.3.3.5-rc.
o Minor bugfixes (rust, protover):
- Compute protover votes correctly in the rust version of the
protover code. Previously, the protover rewrite in 24031 allowed
repeated votes from the same voter for the same protocol version
to be counted multiple times in protover_compute_vote(). Fixes bug
27649; bugfix on 0.3.3.5-rc.
- Reject protover names that contain invalid characters. Fixes bug
27687; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (testing):
- Fix two unit tests to work when HOME environment variable is not
set. Fixes bug 27096; bugfix on 0.2.8.1-alpha.
- If a unit test running in a subprocess exits abnormally or with a
nonzero status code, treat the test as having failed, even if the
test reported success. Without this fix, memory leaks don't cause
the tests to fail, even with LeakSanitizer. Fixes bug 27658;
bugfix on 0.2.2.4-alpha.
- When logging a version mismatch in our openssl_version tests,
report the actual offending version strings. Fixes bug 26152;
bugfix on 0.2.9.1-alpha.
- Fix forking tests on Windows when there is a space somewhere in
the path. Fixes bug 26437; bugfix on 0.2.2.4-alpha.
o Code simplification and refactoring:
- 'updateFallbackDirs.py' now ignores the blacklist file, as it's not
longer needed. Closes ticket 26502.
- Include paths to header files within Tor are now qualified by
directory within the top-level src directory.
- Many structures have been removed from the centralized "or.h"
header, and moved into their own headers. This will allow us to
reduce the number of places in the code that rely on each
structure's contents and layout. Closes ticket 26383.
- Remove ATTR_NONNULL macro from codebase. Resolves ticket 26527.
- Remove GetAdaptersAddresses_fn_t. The code that used it was
removed as part of the 26481 refactor. Closes ticket 27467.
- Rework Tor SOCKS server code to use Trunnel and benefit from
autogenerated functions for parsing and generating SOCKS wire
format. New implementation is cleaner, more maintainable and
should be less prone to heartbleed-style vulnerabilities.
Implements a significant fraction of ticket 3569.
- Split sampled_guards_update_from_consensus() and
select_entry_guard_for_circuit() into subfunctions. In
entry_guards_update_primary() unite three smartlist enumerations
into one and move smartlist comparison code out of the function.
Closes ticket 21349.
- Tor now assumes that you have standards-conformant stdint.h and
inttypes.h headers when compiling. Closes ticket 26626.
- Unify our bloom filter logic. Previously we had two copies of this
code: one for routerlist filtering, and one for address set
calculations. Closes ticket 26510.
- Use the simpler strcmpstart() helper in
rend_parse_v2_service_descriptor instead of strncmp(). Closes
ticket 27630.
- Utility functions that can perform a DNS lookup are now wholly
separated from those that can't, in separate headers and C
modules. Closes ticket 26526.
o Documentation:
- Copy paragraph and URL to Tor's code of conduct document from
CONTRIBUTING to new CODE_OF_CONDUCT file. Resolves ticket 26638.
- Remove old instructions from INSTALL document. Closes ticket 26588.
- Warn users that they should not include MyFamily line(s) in their
torrc when running Tor bridge. Closes ticket 26908.
o Removed features:
- Tor no longer supports building with the dmalloc library. For
debugging memory issues, we suggest using gperftools or msan
instead. Closes ticket 26426.
- Tor no longer attempts to run on Windows environments without the
GetAdaptersAddresses() function. This function has existed since
Windows XP, which is itself already older than we support.
- Remove Tor2web functionality for version 2 onion services. The
Tor2webMode and Tor2webRendezvousPoints options are now obsolete.
(This feature was never shipped in vanilla Tor and it was only
possible to use this feature by building the support at compile
time. Tor2webMode is not implemented for version 3 onion services.)
Closes ticket 26367.
Changes in version 0.2.9.17 - 2018-09-10
Tor 0.2.9.17 backports numerous bugfixes from later versions of Tor.
o Minor features (compatibility, backport from 0.3.4.8):
- Tell OpenSSL to maintain backward compatibility with previous
RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
ciphers are disabled by default. Closes ticket 27344.
o Minor features (continuous integration, backport from 0.3.4.7-rc):
- Enable macOS builds in our Travis CI configuration. Closes
ticket 24629.
- Install libcap-dev and libseccomp2-dev so these optional
dependencies get tested on Travis CI. Closes ticket 26560.
- Run asciidoc during Travis CI. Implements ticket 27087.
- Use ccache in our Travis CI configuration. Closes ticket 26952.
o Minor features (geoip):
- Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
Country database. Closes ticket 27089.
o Minor bugfixes (compilation, backport from 0.3.4.6-rc):
- When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
tell the compiler not to include the system malloc implementation.
Fixes bug 20424; bugfix on 0.2.0.20-rc.
o Minor bugfixes (compilation, backport from 0.3.4.7-rc):
- Silence a spurious compiler warning on the GetAdaptersAddresses
function pointer cast. This issue is already fixed by 26481 in
0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
bugfix on 0.2.3.11-alpha.
- Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
supported, and always fails. Some compilers warn about the
function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
on 0.2.2.23-alpha.
o Minor bugfixes (compilation, windows, backport from 0.3.4.7-rc):
- Don't link or search for pthreads when building for Windows, even
if we are using build environment (like mingw) that provides a
pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
o Minor bugfixes (continuous integration, backport from 0.3.4.6-rc):
- Skip a pair of unreliable key generation tests on Windows, until
the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
o Minor bugfixes (continuous integration, backport from 0.3.4.7-rc):
- Pass the module flags to distcheck configure, and log the flags
before running configure. (Backported to 0.2.9 and later as a
precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (continuous integration, backport from 0.3.4.8):
- When a Travis build fails, and showing a log fails, keep trying to
show the other logs. Fixes bug 27453; bugfix on 0.3.4.7-rc.
- When we use echo in Travis, don't pass a --flag as the first
argument. Fixes bug 27418; bugfix on 0.3.4.7-rc.
o Minor bugfixes (directory authority, backport from 0.3.4.6-rc):
- When voting for recommended versions, make sure that all of the
versions are well-formed and parsable. Fixes bug 26485; bugfix
on 0.1.1.6-alpha.
o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.4.7-rc):
- Fix a bug in out sandboxing rules for the openat() syscall.
Previously, no openat() call would be permitted, which would break
filesystem operations on recent glibc versions. Fixes bug 25440;
bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
o Minor bugfixes (onion services, backport from 0.3.4.8):
- Silence a spurious compiler warning in
rend_client_send_introduction(). Fixes bug 27463; bugfix
on 0.1.1.2-alpha.
o Minor bugfixes (single onion services, Tor2web, backport from 0.3.4.6-rc):
- Log a protocol warning when single onion services or Tor2web clients
fail to authenticate direct connections to relays.
Fixes bug 26924; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (testing, backport from 0.3.4.6-rc):
- Disable core dumps in test_bt.sh, to avoid failures in "make
distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
o Minor bugfixes (testing, chutney, backport from 0.3.4.8):
- Before running make test-network-all, delete old logs and test
result files, to avoid spurious failures. Fixes bug 27295; bugfix
on 0.2.7.3-rc.
o Minor bugfixes (testing, openssl compatibility, backport from 0.3.4.7-rc):
- Our "tortls/cert_matches_key" unit test no longer relies on
OpenSSL internals. Previously, it relied on unsupported OpenSSL
behavior in a way that caused it to crash with OpenSSL 1.0.2p.
Fixes bug 27226; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (Windows, compilation, backport from 0.3.4.7-rc):
- Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
27185; bugfix on 0.2.2.2-alpha.
Changes in version 0.3.2.12 - 2018-09-10
Tor 0.3.2.12 backport numerous fixes from later versions of Tor.
o Minor features (compatibility, backport from 0.3.4.8):
- Tell OpenSSL to maintain backward compatibility with previous
RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
ciphers are disabled by default. Closes ticket 27344.
o Minor features (continuous integration, backport from 0.3.4.7-rc):
- Enable macOS builds in our Travis CI configuration. Closes
ticket 24629.
- Install libcap-dev and libseccomp2-dev so these optional
dependencies get tested on Travis CI. Closes ticket 26560.
- Run asciidoc during Travis CI. Implements ticket 27087.
- Use ccache in our Travis CI configuration. Closes ticket 26952.
o Minor features (continuous integration, rust, backport from 0.3.4.7-rc):
- Use cargo cache in our Travis CI configuration. Closes
ticket 26952.
o Minor features (controller, backport from 0.3.4.6-rc):
- The control port now exposes the list of HTTPTunnelPorts and
ExtOrPorts via GETINFO net/listeners/httptunnel and
net/listeners/extor respectively. Closes ticket 26647.
o Minor features (directory authorities, backport from 0.3.4.7-rc):
- Authorities no longer vote to make the subprotocol version
"LinkAuth=1" a requirement: it is unsupportable with NSS, and
hasn't been needed since Tor 0.3.0.1-alpha. Closes ticket 27286.
o Minor features (geoip):
- Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
Country database. Closes ticket 27089.
o Minor bugfixes (compilation, backport from 0.3.4.6-rc):
- When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
tell the compiler not to include the system malloc implementation.
Fixes bug 20424; bugfix on 0.2.0.20-rc.
- Don't try to use a pragma to temporarily disable the
-Wunused-const-variable warning if the compiler doesn't support
it. Fixes bug 26785; bugfix on 0.3.2.11.
o Minor bugfixes (compilation, backport from 0.3.4.7-rc):
- Silence a spurious compiler warning on the GetAdaptersAddresses
function pointer cast. This issue is already fixed by 26481 in
0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
bugfix on 0.2.3.11-alpha.
- Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
supported, and always fails. Some compilers warn about the
function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
on 0.2.2.23-alpha.
o Minor bugfixes (compilation, windows, backport from 0.3.4.7-rc):
- Don't link or search for pthreads when building for Windows, even
if we are using build environment (like mingw) that provides a
pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
o Minor bugfixes (continuous integration, backport from 0.3.4.6-rc):
- Skip a pair of unreliable key generation tests on Windows, until
the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
o Minor bugfixes (continuous integration, backport from 0.3.4.7-rc):
- Build with zstd on macOS. Fixes bug 27090; bugfix on 0.3.1.5-alpha.
- Pass the module flags to distcheck configure, and log the flags
before running configure. (Backported to 0.2.9 and later as a
precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (continuous integration, backport from 0.3.4.8):
- When a Travis build fails, and showing a log fails, keep trying to
show the other logs. Fixes bug 27453; bugfix on 0.3.4.7-rc.
- When we use echo in Travis, don't pass a --flag as the first
argument. Fixes bug 27418; bugfix on 0.3.4.7-rc.
o Minor bugfixes (directory authority, backport from 0.3.4.6-rc):
- When voting for recommended versions, make sure that all of the
versions are well-formed and parsable. Fixes bug 26485; bugfix
on 0.1.1.6-alpha.
o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.4.7-rc):
- Fix a bug in out sandboxing rules for the openat() syscall.
Previously, no openat() call would be permitted, which would break
filesystem operations on recent glibc versions. Fixes bug 25440;
bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
o Minor bugfixes (logging, backport from 0.3.4.6-rc):
- Improve the log message when connection initiators fail to
authenticate direct connections to relays. Fixes bug 26927; bugfix
on 0.3.0.1-alpha.
o Minor bugfixes (onion services, backport from 0.3.4.7-rc):
- Fix bug that causes services to not ever rotate their descriptors
if they were getting SIGHUPed often. Fixes bug 26932; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (onion services, backport from 0.3.4.8):
- Silence a spurious compiler warning in
rend_client_send_introduction(). Fixes bug 27463; bugfix
on 0.1.1.2-alpha.
o Minor bugfixes (rust, backport from 0.3.4.7-rc):
- Backport test_rust.sh from master. Fixes bug 26497; bugfix
on 0.3.1.5-alpha.
- Consistently use ../../.. as a fallback for $abs_top_srcdir in
test_rust.sh. Fixes bug 27093; bugfix on 0.3.4.3-alpha.
- Stop setting $CARGO_HOME. cargo will use the user's $CARGO_HOME, or
$HOME/.cargo by default. Fixes bug 26497; bugfix on 0.3.1.5-alpha.
o Minor bugfixes (single onion services, Tor2web, backport from 0.3.4.6-rc):
- Log a protocol warning when single onion services or Tor2web clients
fail to authenticate direct connections to relays.
Fixes bug 26924; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (testing, backport from 0.3.4.6-rc):
- Disable core dumps in test_bt.sh, to avoid failures in "make
distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
o Minor bugfixes (testing, chutney, backport from 0.3.4.8):
- When running make test-network-all, use the mixed+hs-v2 network.
(A previous fix to chutney removed v3 onion services from the
mixed+hs-v23 network, so seeing "mixed+hs-v23" in tests is
confusing.) Fixes bug 27345; bugfix on 0.3.2.1-alpha.
- Before running make test-network-all, delete old logs and test
result files, to avoid spurious failures. Fixes bug 27295; bugfix
on 0.2.7.3-rc.
o Minor bugfixes (testing, openssl compatibility):
- Our "tortls/cert_matches_key" unit test no longer relies on OpenSSL
internals. Previously, it relied on unsupported OpenSSL behavior in
a way that caused it to crash with OpenSSL 1.0.2p. Fixes bug 27226;
bugfix on 0.2.5.1-alpha.
o Minor bugfixes (testing, openssl compatibility, backport from 0.3.4.7-rc):
- Our "tortls/cert_matches_key" unit test no longer relies on
OpenSSL internals. Previously, it relied on unsupported OpenSSL
behavior in a way that caused it to crash with OpenSSL 1.0.2p.
Fixes bug 27226; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (Windows, compilation, backport from 0.3.4.7-rc):
- Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
27185; bugfix on 0.2.2.2-alpha.
Changes in version 0.3.3.10 - 2018-09-10
Tor 0.3.3.10 backports numerous fixes from later versions of Tor.
o Minor features (bug workaround, backport from 0.3.4.7-rc):
- Compile correctly on systems that provide the C11 stdatomic.h
header, but where C11 atomic functions don't actually compile.
Closes ticket 26779; workaround for Debian issue 903709.
o Minor features (compatibility, backport from 0.3.4.8):
- Tell OpenSSL to maintain backward compatibility with previous
RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
ciphers are disabled by default. Closes ticket 27344.
o Minor features (continuous integration, backport from 0.3.4.7-rc):
- Backport Travis rust distcheck to 0.3.3. Closes ticket 24629.
- Enable macOS builds in our Travis CI configuration. Closes
ticket 24629.
- Install libcap-dev and libseccomp2-dev so these optional
dependencies get tested on Travis CI. Closes ticket 26560.
- Run asciidoc during Travis CI. Implements ticket 27087.
- Use ccache in our Travis CI configuration. Closes ticket 26952.
o Minor features (continuous integration, rust, backport from 0.3.4.7-rc):
- Use cargo cache in our Travis CI configuration. Closes
ticket 26952.
o Minor features (controller, backport from 0.3.4.6-rc):
- The control port now exposes the list of HTTPTunnelPorts and
ExtOrPorts via GETINFO net/listeners/httptunnel and
net/listeners/extor respectively. Closes ticket 26647.
o Minor features (directory authorities, backport from 0.3.4.7-rc):
- Authorities no longer vote to make the subprotocol version
"LinkAuth=1" a requirement: it is unsupportable with NSS, and
hasn't been needed since Tor 0.3.0.1-alpha. Closes ticket 27286.
o Minor features (geoip):
- Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
Country database. Closes ticket 27089.
o Minor bugfixes (compilation, backport from 0.3.4.6-rc):
- When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
tell the compiler not to include the system malloc implementation.
Fixes bug 20424; bugfix on 0.2.0.20-rc.
- Don't try to use a pragma to temporarily disable the
-Wunused-const-variable warning if the compiler doesn't support
it. Fixes bug 26785; bugfix on 0.3.2.11.
o Minor bugfixes (compilation, backport from 0.3.4.7-rc):
- Silence a spurious compiler warning on the GetAdaptersAddresses
function pointer cast. This issue is already fixed by 26481 in
0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
bugfix on 0.2.3.11-alpha.
- Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
supported, and always fails. Some compilers warn about the
function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
on 0.2.2.23-alpha.
o Minor bugfixes (compilation, windows, backport from 0.3.4.7-rc):
- Don't link or search for pthreads when building for Windows, even
if we are using build environment (like mingw) that provides a
pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
o Minor bugfixes (continuous integration, backport from 0.3.4.6-rc):
- Skip a pair of unreliable key generation tests on Windows, until
the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
o Minor bugfixes (continuous integration, backport from 0.3.4.7-rc):
- Build with zstd on macOS. Fixes bug 27090; bugfix on 0.3.1.5-alpha.
- Pass the module flags to distcheck configure, and log the flags
before running configure. (Backported to 0.2.9 and later as a
precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (continuous integration, backport from 0.3.4.8):
- When a Travis build fails, and showing a log fails, keep trying to
show the other logs. Fixes bug 27453; bugfix on 0.3.4.7-rc.
- When we use echo in Travis, don't pass a --flag as the first
argument. Fixes bug 27418; bugfix on 0.3.4.7-rc.
o Minor bugfixes (directory authority, backport from 0.3.4.6-rc):
- When voting for recommended versions, make sure that all of the
versions are well-formed and parsable. Fixes bug 26485; bugfix
on 0.1.1.6-alpha.
o Minor bugfixes (in-process restart, backport from 0.3.4.7-rc):
- Always call tor_free_all() when leaving tor_run_main(). When we
did not, restarting tor in-process would cause an assertion
failure. Fixes bug 26948; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.4.7-rc):
- Fix a bug in our sandboxing rules for the openat() syscall.
Previously, no openat() call would be permitted, which would break
filesystem operations on recent glibc versions. Fixes bug 25440;
bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
o Minor bugfixes (logging, backport from 0.3.4.6-rc):
- Improve the log message when connection initiators fail to
authenticate direct connections to relays. Fixes bug 26927; bugfix
on 0.3.0.1-alpha.
o Minor bugfixes (onion services, backport from 0.3.4.7-rc):
- Fix bug that causes services to not ever rotate their descriptors
if they were getting SIGHUPed often. Fixes bug 26932; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (onion services, backport from 0.3.4.8):
- Silence a spurious compiler warning in
rend_client_send_introduction(). Fixes bug 27463; bugfix
on 0.1.1.2-alpha.
o Minor bugfixes (portability, backport from 0.3.4.6-rc):
- Work around two different bugs in the OS X 10.10 and later SDKs
that would prevent us from successfully targeting earlier versions
of OS X. Fixes bug 26876; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (portability, backport from 0.3.4.7-rc):
- Fix compilation of the unit tests on GNU/Hurd, which does not
define PATH_MAX. Fixes bug 26873; bugfix on 0.3.3.1-alpha. Patch
from "paulusASol".
o Minor bugfixes (rust, backport from 0.3.4.7-rc):
- Backport test_rust.sh from master. Fixes bug 26497; bugfix
on 0.3.1.5-alpha.
- Consistently use ../../.. as a fallback for $abs_top_srcdir in
test_rust.sh. Fixes bug 27093; bugfix on 0.3.4.3-alpha.
- Protover parsing was accepting the presence of whitespace in
version strings, which the C implementation would choke on, e.g.
"Desc=1\t,2". Fixes bug 27177; bugfix on 0.3.3.5-rc.
- Protover parsing was ignoring a 2nd hyphen and everything after
it, accepting entries like "Link=1-5-foo". Fixes bug 27164; bugfix
on 0.3.3.1-alpha.
- Stop setting $CARGO_HOME. cargo will use the user's $CARGO_HOME, or
$HOME/.cargo by default. Fixes bug 26497; bugfix on 0.3.1.5-alpha.
- cd to ${abs_top_builddir}/src/rust before running cargo in
src/test/test_rust.sh. This makes the working directory consistent
between builds and tests. Fixes bug 26497; bugfix on 0.3.3.2-alpha.
o Minor bugfixes (single onion services, Tor2web, backport from 0.3.4.6-rc):
- Log a protocol warning when single onion services or Tor2web clients
fail to authenticate direct connections to relays.
Fixes bug 26924; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (testing, backport from 0.3.4.6-rc):
- Disable core dumps in test_bt.sh, to avoid failures in "make
distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
o Minor bugfixes (testing, chutney, backport from 0.3.4.8):
- When running make test-network-all, use the mixed+hs-v2 network.
(A previous fix to chutney removed v3 onion services from the
mixed+hs-v23 network, so seeing "mixed+hs-v23" in tests is
confusing.) Fixes bug 27345; bugfix on 0.3.2.1-alpha.
- Before running make test-network-all, delete old logs and test
result files, to avoid spurious failures. Fixes bug 27295; bugfix
on 0.2.7.3-rc.
o Minor bugfixes (testing, openssl compatibility, backport from 0.3.4.7-rc):
- Our "tortls/cert_matches_key" unit test no longer relies on
OpenSSL internals. Previously, it relied on unsupported OpenSSL
behavior in a way that caused it to crash with OpenSSL 1.0.2p.
Fixes bug 27226; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (v3 onion services, backport from 0.3.4.6-rc):
- Stop sending ed25519 link specifiers in v3 onion service introduce
cells and descriptors, when the rendezvous or introduction point
doesn't support ed25519 link authentication. Fixes bug 26627;
bugfix on 0.3.2.4-alpha.
o Minor bugfixes (Windows, compilation, backport from 0.3.4.7-rc):
- Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
27185; bugfix on 0.2.2.2-alpha.
Changes in version 0.3.4.8 - 2018-09-10
Tor 0.3.4.8 is the first stable release in its series; it includes
compilation and portability fixes.
The Tor 0.3.4 series includes improvements for running Tor in
low-power and embedded environments, which should help performance in
general. We've begun work on better modularity, and included preliminary
changes on the directory authority side to accommodate a new bandwidth
measurement system. We've also integrated more continuous-integration
systems into our development process, and made corresponding changes to
Tor's testing infrastructure. Finally, we've continued to refine
our anti-denial-of-service code.
Below are the changes since 0.3.4.7-rc. For a complete list of changes
since 0.3.3.9, see the ReleaseNotes file.
o Minor features (compatibility):
- Tell OpenSSL to maintain backward compatibility with previous
RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
ciphers are disabled by default. Closes ticket 27344.
o Minor features (continuous integration):
- Log the compiler path and version during Appveyor builds.
Implements ticket 27449.
- Show config.log and test-suite.log after failed Appveyor builds.
Also upload the zipped full logs as a build artifact. Implements
ticket 27430.
o Minor bugfixes (compilation):
- Silence a spurious compiler warning on the GetAdaptersAddresses
function pointer cast. This issue is already fixed by 26481 in
0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
bugfix on 0.2.3.11-alpha.
- Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
supported, and always fails. Some compilers warn about the
function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
on 0.2.2.23-alpha.
o Minor bugfixes (continuous integration):
- Disable gcc hardening in Appveyor Windows 64-bit builds. As of
August 29 2018, Appveyor images come with gcc 8.2.0 by default.
Executables compiled for 64-bit Windows with this version of gcc
crash when Tor's --enable-gcc-hardening flag is set. Fixes bug
27460; bugfix on 0.3.4.1-alpha.
- When a Travis build fails, and showing a log fails, keep trying to
show the other logs. Fixes bug 27453; bugfix on 0.3.4.7-rc.
- When we use echo in Travis, don't pass a --flag as the first
argument. Fixes bug 27418; bugfix on 0.3.4.7-rc.
o Minor bugfixes (onion services):
- Silence a spurious compiler warning in
rend_client_send_introduction(). Fixes bug 27463; bugfix
on 0.1.1.2-alpha.
o Minor bugfixes (testing, chutney):
- When running make test-network-all, use the mixed+hs-v2 network.
(A previous fix to chutney removed v3 onion services from the
mixed+hs-v23 network, so seeing "mixed+hs-v23" in tests is
confusing.) Fixes bug 27345; bugfix on 0.3.2.1-alpha.
- Before running make test-network-all, delete old logs and test
result files, to avoid spurious failures. Fixes bug 27295; bugfix
on 0.2.7.3-rc.
Changes in version 0.3.4.7-rc - 2018-08-24
Tor 0.3.4.7-rc fixes several small compilation, portability, and
correctness issues in previous versions of Tor. This version is a
release candidate: if no serious bugs are found, we expect that the
stable 0.3.4 release will be (almost) the same as this release.
o Minor features (bug workaround):
- Compile correctly on systems that provide the C11 stdatomic.h
header, but where C11 atomic functions don't actually compile.
Closes ticket 26779; workaround for Debian issue 903709.
o Minor features (continuous integration):
- Backport Travis rust distcheck to 0.3.3. Closes ticket 24629.
- Enable macOS builds in our Travis CI configuration. Closes
ticket 24629.
- Install libcap-dev and libseccomp2-dev so these optional
dependencies get tested on Travis CI. Closes ticket 26560.
- Only post Appveyor IRC notifications when the build fails.
Implements ticket 27275.
- Run asciidoc during Travis CI. Implements ticket 27087.
- Use ccache in our Travis CI configuration. Closes ticket 26952.
o Minor features (continuous integration, rust):
- Use cargo cache in our Travis CI configuration. Closes
ticket 26952.
o Minor features (directory authorities):
- Authorities no longer vote to make the subprotocol version
"LinkAuth=1" a requirement: it is unsupportable with NSS, and
hasn't been needed since Tor 0.3.0.1-alpha. Closes ticket 27286.
o Minor features (geoip):
- Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
Country database. Closes ticket 27089.
o Minor bugfixes (compilation, windows):
- Don't link or search for pthreads when building for Windows, even
if we are using build environment (like mingw) that provides a
pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
o Minor bugfixes (continuous integration):
- Improve Appveyor CI IRC logging. Generate correct branches and
URLs for pull requests and tags. Use unambiguous short commits.
Fixes bug 26979; bugfix on master.
- Build with zstd on macOS. Fixes bug 27090; bugfix on 0.3.1.5-alpha.
- Pass the module flags to distcheck configure, and log the flags
before running configure. (Backported to 0.2.9 and later as a
precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (in-process restart):
- Always call tor_free_all() when leaving tor_run_main(). When we
did not, restarting tor in-process would cause an assertion
failure. Fixes bug 26948; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (linux seccomp2 sandbox):
- Fix a bug in out sandboxing rules for the openat() syscall.
Previously, no openat() call would be permitted, which would break
filesystem operations on recent glibc versions. Fixes bug 25440;
bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
o Minor bugfixes (onion services):
- Fix bug that causes services to not ever rotate their descriptors
if they were getting SIGHUPed often. Fixes bug 26932; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (portability):
- Fix compilation of the unit tests on GNU/Hurd, which does not
define PATH_MAX. Fixes bug 26873; bugfix on 0.3.3.1-alpha. Patch
from "paulusASol".
o Minor bugfixes (rust):
- Backport test_rust.sh from master. Fixes bug 26497; bugfix
on 0.3.1.5-alpha.
- Consistently use ../../.. as a fallback for $abs_top_srcdir in
test_rust.sh. Fixes bug 27093; bugfix on 0.3.4.3-alpha.
- Protover parsing was accepting the presence of whitespace in
version strings, which the C implementation would choke on, e.g.
"Desc=1\t,2". Fixes bug 27177; bugfix on 0.3.3.5-rc.
- Protover parsing was ignoring a 2nd hyphen and everything after
it, accepting entries like "Link=1-5-foo". Fixes bug 27164; bugfix
on 0.3.3.1-alpha.
- Stop setting $CARGO_HOME. cargo will use the user's $CARGO_HOME, or
$HOME/.cargo by default. Fixes bug 26497; bugfix on 0.3.1.5-alpha.
- cd to ${abs_top_builddir}/src/rust before running cargo in
src/test/test_rust.sh. This makes the working directory consistent
between builds and tests. Fixes bug 26497; bugfix on 0.3.3.2-alpha.
o Minor bugfixes (testing, bootstrap):
- When calculating bootstrap progress, check exit policies and the
exit flag. Previously, Tor would only check the exit flag, which
caused race conditions in small and fast networks like chutney.
Fixes bug 27236; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (testing, openssl compatibility):
- Our "tortls/cert_matches_key" unit test no longer relies on
OpenSSL internals. Previously, it relied on unsupported OpenSSL
behavior in a way that caused it to crash with OpenSSL 1.0.2p.
Fixes bug 27226; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (Windows, compilation):
- Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
27185; bugfix on 0.2.2.2-alpha.
Changes in version 0.3.4.6-rc - 2018-08-06
Tor 0.3.4.6-rc fixes several small compilation, portability, and
correctness issues in previous versions of Tor. This version is a
release candidate: if no serious bugs are found, we expect that the
stable 0.3.4 release will be (almost) the same as this release.
o Major bugfixes (event scheduler):
- When we enable a periodic event, schedule it in the event loop
rather than running it immediately. Previously, we would re-run
periodic events immediately in the middle of (for example)
changing our options, with unpredictable effects. Fixes bug 27003;
bugfix on 0.3.4.1-alpha.
o Minor features (compilation):
- When building Tor, prefer to use Python 3 over Python 2, and more
recent (contemplated) versions over older ones. Closes
ticket 26372.
- When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
tell the compiler not to include the system malloc implementation.
Fixes bug 20424; bugfix on 0.2.0.20-rc.
- Don't try to use a pragma to temporarily disable the
-Wunused-const-variable warning if the compiler doesn't support
it. Fixes bug 26785; bugfix on 0.3.2.11.
o Minor bugfixes (continuous integration):
- Skip a pair of unreliable key generation tests on Windows, until
the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
o Minor features (controller):
- The control port now exposes the list of HTTPTunnelPorts and
ExtOrPorts via GETINFO net/listeners/httptunnel and
net/listeners/extor respectively. Closes ticket 26647.
o Minor bugfixes (directory authority):
- When voting for recommended versions, make sure that all of the
versions are well-formed and parsable. Fixes bug 26485; bugfix
on 0.1.1.6-alpha.
o Minor features (geoip):
- Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
Country database. Closes ticket 26674.
o Minor features (Rust, portability):
- Rust cross-compilation is now supported. Closes ticket 25895.
o Minor bugfixes (compilation):
- Update build system so that tor builds again with --disable-unittests
after recent refactoring. Fixes bug 26789; bugfix on 0.3.4.3-alpha.
- Fix a compilation warning on some versions of GCC when building
code that calls routerinfo_get_my_routerinfo() twice, assuming
that the second call will succeed if the first one did. Fixes bug
26269; bugfix on 0.2.8.2-alpha.
o Minor bugfixes (controller):
- Report the port correctly when a port is configured to bind to
"auto". Fixes bug 26568; bugfix on 0.3.4.1-alpha.
- Parse the "HSADDRESS=" parameter in HSPOST commands properly.
Previously, it was misparsed and ignored. Fixes bug 26523; bugfix
on 0.3.3.1-alpha. Patch by "akwizgran".
o Minor bugfixes (correctness, flow control):
- Upon receiving a stream-level SENDME cell, verify that our window
has not grown too large. Fixes bug 26214; bugfix on svn
r54 (pre-0.0.1).
o Minor bugfixes (memory, correctness):
- Fix a number of small memory leaks identified by coverity. Fixes
bug 26467; bugfix on numerous Tor versions.
o Minor bugfixes (logging):
- Improve the log message when connection initiators fail to
authenticate direct connections to relays. Fixes bug 26927; bugfix
on 0.3.0.1-alpha.
o Minor bugfixes (portability):
- Avoid a compilation error in test_bwmgt.c on Solaris 10. Fixes bug
26994; bugfix on 0.3.4.1-alpha.
- Work around two different bugs in the OS X 10.10 and later SDKs
that would prevent us from successfully targeting earlier versions
of OS X. Fixes bug 26876; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (single onion services, Tor2web):
- Log a protocol warning when single onion services or Tor2web
clients fail to authenticate direct connections to relays. Fixes
bug 26924; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (testing):
- Disable core dumps in test_bt.sh, to avoid failures in "make
distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
o Minor bugfixes (testing, compatibility):
- When running the ntor_ref.py and hs_ntor_ref.py tests, make sure
only to pass strings (rather than "bytes" objects) to the Python
subprocess module. Python 3 on Windows seems to require this.
Fixes bug 26535; bugfix on 0.2.5.5-alpha (for ntor_ref.py) and
0.3.1.1-alpha (for hs_ntor_ref.py).
o Minor bugfixes (v3 onion services):
- Stop sending ed25519 link specifiers in v3 onion service introduce
cells and descriptors, when the rendezvous or introduction point
doesn't support ed25519 link authentication. Fixes bug 26627;
bugfix on 0.3.2.4-alpha.
Changes in version 0.3.4.5-rc - 2018-07-13
Tor 0.3.4.5-rc moves to a new bridge authority, meaning people running
bridge relays should upgrade.
o Directory authority changes:
- The "Bifroest" bridge authority has been retired; the new bridge
authority is "Serge", and it is operated by George from the
TorBSD project. Closes ticket 26771.
Changes in version 0.3.3.9 - 2018-07-13
Tor 0.3.3.9 moves to a new bridge authority, meaning people running
bridge relays should upgrade.
o Directory authority changes:
- The "Bifroest" bridge authority has been retired; the new bridge
authority is "Serge", and it is operated by George from the
TorBSD project. Closes ticket 26771.
Changes in version 0.3.2.11 - 2018-07-13
Tor 0.3.2.11 moves to a new bridge authority, meaning people running
bridge relays should upgrade. We also take this opportunity to backport
other minor fixes.
o Directory authority changes:
- The "Bifroest" bridge authority has been retired; the new bridge
authority is "Serge", and it is operated by George from the
TorBSD project. Closes ticket 26771.
o Directory authority changes (backport from 0.3.3.7):
- Add an IPv6 address for the "dannenberg" directory authority.
Closes ticket 26343.
o Major bugfixes (directory authorities, backport from 0.3.4.1-alpha):
- When directory authorities read a zero-byte bandwidth file, they
would previously log a warning with the contents of an
uninitialised buffer. They now log a warning about the empty file
instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
o Major bugfixes (onion service, backport from 0.3.4.1-alpha):
- Correctly detect when onion services get disabled after HUP. Fixes
bug 25761; bugfix on 0.3.2.1.
o Minor features (sandbox, backport from 0.3.3.4-alpha):
- Explicitly permit the poll() system call when the Linux
seccomp2-based sandbox is enabled: apparently, some versions of
libc use poll() when calling getpwnam(). Closes ticket 25313.
o Minor feature (continuous integration, backport from 0.3.3.5-rc):
- Update the Travis CI configuration to use the stable Rust channel,
now that we have decided to require that. Closes ticket 25714.
o Minor features (continuous integration, backport from 0.3.4.1-alpha):
- Our .travis.yml configuration now includes support for testing the
results of "make distcheck". (It's not uncommon for "make check"
to pass but "make distcheck" to fail.) Closes ticket 25814.
- Our Travis CI configuration now integrates with the Coveralls
coverage analysis tool. Closes ticket 25818.
o Minor features (relay, diagnostic, backport from 0.3.4.3-alpha):
- Add several checks to detect whether Tor relays are uploading
their descriptors without specifying why they regenerated them.
Diagnostic for ticket 25686.
o Minor features (compilation, backport from 0.3.4.4-rc):
- When building Tor, prefer to use Python 3 over Python 2, and more
recent (contemplated) versions over older ones. Closes
ticket 26372.
o Minor features (geoip):
- Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
Country database. Closes ticket 26674.
o Minor bugfixes (correctness, client, backport from 0.3.4.1-alpha):
- Upon receiving a malformed connected cell, stop processing the
cell immediately. Previously we would mark the connection for
close, but continue processing the cell as if the connection were
open. Fixes bug 26072; bugfix on 0.2.4.7-alpha.
o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.4.1-alpha):
- Allow the nanosleep() system call, which glibc uses to implement
sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (testing, compatibility, backport from 0.3.4.4-rc):
- When running the hs_ntor_ref.py test, make sure only to pass
strings (rather than "bytes" objects) to the Python subprocess
module. Python 3 on Windows seems to require this. Fixes bug
26535; bugfix on 0.3.1.1-alpha.
- When running the ntor_ref.py test, make sure only to pass strings
(rather than "bytes" objects) to the Python subprocess module.
Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
on 0.2.5.5-alpha.
o Minor bugfixes (compatibility, openssl, backport from 0.3.4.2-alpha):
- Work around a change in OpenSSL 1.1.1 where return values that
would previously indicate "no password" now indicate an empty
password. Without this workaround, Tor instances running with
OpenSSL 1.1.1 would accept descriptors that other Tor instances
would reject. Fixes bug 26116; bugfix on 0.2.5.16.
o Minor bugfixes (documentation, backport from 0.3.3.5-rc):
- Document that the PerConnBW{Rate,Burst} options will fall back to
their corresponding consensus parameters only if those parameters
are set. Previously we had claimed that these values would always
be set in the consensus. Fixes bug 25296; bugfix on 0.2.2.7-alpha.
o Minor bugfixes (compilation, backport from 0.3.4.4-rc):
- Fix a compilation warning on some versions of GCC when building
code that calls routerinfo_get_my_routerinfo() twice, assuming
that the second call will succeed if the first one did. Fixes bug
26269; bugfix on 0.2.8.2-alpha.
o Minor bugfixes (client, backport from 0.3.4.1-alpha):
- Don't consider Tor running as a client if the ControlPort is open,
but no actual client ports are open. Fixes bug 26062; bugfix
on 0.2.9.4-alpha.
o Minor bugfixes (hardening, backport from 0.3.4.2-alpha):
- Prevent a possible out-of-bounds smartlist read in
protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
o Minor bugfixes (C correctness, backport from 0.3.3.4-alpha):
- Fix a very unlikely (impossible, we believe) null pointer
dereference. Fixes bug 25629; bugfix on 0.2.9.15. Found by
Coverity; this is CID 1430932.
o Minor bugfixes (onion service, backport from 0.3.4.1-alpha):
- Fix a memory leak when a v3 onion service is configured and gets a
SIGHUP signal. Fixes bug 25901; bugfix on 0.3.2.1-alpha.
- When parsing the descriptor signature, look for the token plus an
extra white-space at the end. This is more correct but also will
allow us to support new fields that might start with "signature".
Fixes bug 26069; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (relay, backport from 0.3.4.3-alpha):
- Relays now correctly block attempts to re-extend to the previous
relay by Ed25519 identity. Previously they would warn in this
case, but not actually reject the attempt. Fixes bug 26158; bugfix
on 0.3.0.1-alpha.
o Minor bugfixes (relay, crash, backport from 0.3.4.1-alpha):
- Avoid a crash when running with DirPort set but ORPort turned off.
Fixes a case of bug 23693; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (compilation, backport from 0.3.4.2-alpha):
- Silence unused-const-variable warnings in zstd.h with some GCC
versions. Fixes bug 26272; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (testing, backport from 0.3.3.4-alpha):
- Avoid intermittent test failures due to a test that had relied on
onion service introduction point creation finishing within 5
seconds of real clock time. Fixes bug 25450; bugfix
on 0.3.1.3-alpha.
o Minor bugfixes (compilation, backport from 0.3.3.4-alpha):
- Fix a C99 compliance issue in our configuration script that caused
compilation issues when compiling Tor with certain versions of
xtools. Fixes bug 25474; bugfix on 0.3.2.5-alpha.
o Minor bugfixes (memory, correctness, backport from 0.3.4.4-rc):
- Fix a number of small memory leaks identified by coverity. Fixes
bug 26467; bugfix on numerous Tor versions.
o Code simplification and refactoring (backport from 0.3.3.5-rc):
- Move the list of default directory authorities to its own file.
Closes ticket 24854. Patch by "beastr0".
Changes in version 0.2.9.16 - 2018-07-13
Tor 0.2.9.16 moves to a new bridge authority, meaning people running
bridge relays should upgrade. We also take this opportunity to backport
other minor fixes.
o Directory authority changes:
- The "Bifroest" bridge authority has been retired; the new bridge
authority is "Serge", and it is operated by George from the
TorBSD project. Closes ticket 26771.
o Directory authority changes (backport from 0.3.3.7):
- Add an IPv6 address for the "dannenberg" directory authority.
Closes ticket 26343.
o Major bugfixes (directory authorities, backport from 0.3.4.1-alpha):
- When directory authorities read a zero-byte bandwidth file, they
would previously log a warning with the contents of an
uninitialised buffer. They now log a warning about the empty file
instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
o Minor features (sandbox, backport from 0.3.3.4-alpha):
- Explicitly permit the poll() system call when the Linux
seccomp2-based sandbox is enabled: apparently, some versions of
libc use poll() when calling getpwnam(). Closes ticket 25313.
o Minor features (continuous integration, backport from 0.3.4.1-alpha):
- Our .travis.yml configuration now includes support for testing the
results of "make distcheck". (It's not uncommon for "make check"
to pass but "make distcheck" to fail.) Closes ticket 25814.
- Our Travis CI configuration now integrates with the Coveralls
coverage analysis tool. Closes ticket 25818.
o Minor features (compilation, backport from 0.3.4.4-rc):
- When building Tor, prefer to use Python 3 over Python 2, and more
recent (contemplated) versions over older ones. Closes
ticket 26372.
o Minor features (geoip):
- Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
Country database. Closes ticket 26674.
o Minor bugfixes (correctness, client, backport from 0.3.4.1-alpha):
- Upon receiving a malformed connected cell, stop processing the
cell immediately. Previously we would mark the connection for
close, but continue processing the cell as if the connection were
open. Fixes bug 26072; bugfix on 0.2.4.7-alpha.
o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.4.1-alpha):
- Allow the nanosleep() system call, which glibc uses to implement
sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (testing, compatibility, backport from 0.3.4.4-rc):
- When running the ntor_ref.py test, make sure only to pass strings
(rather than "bytes" objects) to the Python subprocess module.
Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
on 0.2.5.5-alpha.
o Minor bugfixes (compatibility, openssl, backport from 0.3.4.2-alpha):
- Work around a change in OpenSSL 1.1.1 where return values that
would previously indicate "no password" now indicate an empty
password. Without this workaround, Tor instances running with
OpenSSL 1.1.1 would accept descriptors that other Tor instances
would reject. Fixes bug 26116; bugfix on 0.2.5.16.
o Minor bugfixes (compilation, backport from 0.3.4.4-rc):
- Fix a compilation warning on some versions of GCC when building
code that calls routerinfo_get_my_routerinfo() twice, assuming
that the second call will succeed if the first one did. Fixes bug
26269; bugfix on 0.2.8.2-alpha.
o Minor bugfixes (client, backport from 0.3.4.1-alpha):
- Don't consider Tor running as a client if the ControlPort is open,
but no actual client ports are open. Fixes bug 26062; bugfix
on 0.2.9.4-alpha.
o Minor bugfixes (hardening, backport from 0.3.4.2-alpha):
- Prevent a possible out-of-bounds smartlist read in
protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
o Minor bugfixes (C correctness, backport from 0.3.3.4-alpha):
- Fix a very unlikely (impossible, we believe) null pointer
dereference. Fixes bug 25629; bugfix on 0.2.9.15. Found by
Coverity; this is CID 1430932.
o Minor bugfixes (memory, correctness, backport from 0.3.4.4-rc):
- Fix a number of small memory leaks identified by coverity. Fixes
bug 26467; bugfix on numerous Tor versions.
o Code simplification and refactoring (backport from 0.3.3.5-rc):
- Move the list of default directory authorities to its own file.
Closes ticket 24854. Patch by "beastr0".
Changes in version 0.3.4.4-rc - 2018-07-09
Tor 0.3.4.4-rc fixes several small compilation, portability, and
correctness issues in previous versions of Tor. This version is a
release candidate: if no serious bugs are found, we expect that the
stable 0.3.4 release will be (almost) the same as this release.
o Minor features (compilation):
- When building Tor, prefer to use Python 3 over Python 2, and more
recent (contemplated) versions over older ones. Closes
ticket 26372.
o Minor features (geoip):
- Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
Country database. Closes ticket 26674.
o Minor features (Rust, portability):
- Rust cross-compilation is now supported. Closes ticket 25895.
o Minor bugfixes (compilation):
- Fix a compilation warning on some versions of GCC when building
code that calls routerinfo_get_my_routerinfo() twice, assuming
that the second call will succeed if the first one did. Fixes bug
26269; bugfix on 0.2.8.2-alpha.
o Minor bugfixes (control port):
- Report the port correctly when a port is configured to bind to
"auto". Fixes bug 26568; bugfix on 0.3.4.1-alpha.
- Handle the HSADDRESS= argument to the HSPOST command properly.
(Previously, this argument was misparsed and thus ignored.) Fixes
bug 26523; bugfix on 0.3.3.1-alpha. Patch by "akwizgran".
o Minor bugfixes (correctness, flow control):
- Upon receiving a stream-level SENDME cell, verify that our window
has not grown too large. Fixes bug 26214; bugfix on svn
r54 (pre-0.0.1).
o Minor bugfixes (memory, correctness):
- Fix a number of small memory leaks identified by coverity. Fixes
bug 26467; bugfix on numerous Tor versions.
o Minor bugfixes (testing, compatibility):
- When running the hs_ntor_ref.py test, make sure only to pass
strings (rather than "bytes" objects) to the Python subprocess
module. Python 3 on Windows seems to require this. Fixes bug
26535; bugfix on 0.3.1.1-alpha.
- When running the ntor_ref.py test, make sure only to pass strings
(rather than "bytes" objects) to the Python subprocess module.
Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
on 0.2.5.5-alpha.
Changes in version 0.3.3.8 - 2018-07-09
Tor 0.3.3.8 backports several changes from the 0.3.4.x series, including
fixes for a memory leak affecting directory authorities.
o Major bugfixes (directory authority, backport from 0.3.4.3-alpha):
- Stop leaking memory on directory authorities when planning to
vote. This bug was crashing authorities by exhausting their
memory. Fixes bug 26435; bugfix on 0.3.3.6.
o Major bugfixes (rust, testing, backport from 0.3.4.3-alpha):
- Make sure that failing tests in Rust will actually cause the build
to fail: previously, they were ignored. Fixes bug 26258; bugfix
on 0.3.3.4-alpha.
o Minor features (compilation, backport from 0.3.4.4-rc):
- When building Tor, prefer to use Python 3 over Python 2, and more
recent (contemplated) versions over older ones. Closes
ticket 26372.
o Minor features (geoip):
- Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
Country database. Closes ticket 26674.
o Minor features (relay, diagnostic, backport from 0.3.4.3-alpha):
- Add several checks to detect whether Tor relays are uploading
their descriptors without specifying why they regenerated them.
Diagnostic for ticket 25686.
o Minor bugfixes (circuit path selection, backport from 0.3.4.1-alpha):
- Don't count path selection failures as circuit build failures.
This change should eliminate cases where Tor blames its guard or
the network for situations like insufficient microdescriptors
and/or overly restrictive torrc settings. Fixes bug 25705; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (compilation, backport from 0.3.4.4-rc):
- Fix a compilation warning on some versions of GCC when building
code that calls routerinfo_get_my_routerinfo() twice, assuming
that the second call will succeed if the first one did. Fixes bug
26269; bugfix on 0.2.8.2-alpha.
o Minor bugfixes (control port, backport from 0.3.4.4-rc):
- Handle the HSADDRESS= argument to the HSPOST command properly.
(Previously, this argument was misparsed and thus ignored.) Fixes
bug 26523; bugfix on 0.3.3.1-alpha. Patch by "akwizgran".
o Minor bugfixes (memory, correctness, backport from 0.3.4.4-rc):
- Fix a number of small memory leaks identified by coverity. Fixes
bug 26467; bugfix on numerous Tor versions.
o Minor bugfixes (relay, backport from 0.3.4.3-alpha):
- Relays now correctly block attempts to re-extend to the previous
relay by Ed25519 identity. Previously they would warn in this
case, but not actually reject the attempt. Fixes bug 26158; bugfix
on 0.3.0.1-alpha.
o Minor bugfixes (restart-in-process, backport from 0.3.4.1-alpha):
- When shutting down, Tor now clears all the flags in the control.c
module. This should prevent a bug where authentication cookies are
not generated on restart. Fixes bug 25512; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (testing, compatibility, backport from 0.3.4.4-rc):
- When running the hs_ntor_ref.py test, make sure only to pass
strings (rather than "bytes" objects) to the Python subprocess
module. Python 3 on Windows seems to require this. Fixes bug
26535; bugfix on 0.3.1.1-alpha.
- When running the ntor_ref.py test, make sure only to pass strings
(rather than "bytes" objects) to the Python subprocess module.
Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
on 0.2.5.5-alpha.
Changes in version 0.3.4.3-alpha - 2018-06-26
Tor 0.3.4.3-alpha fixes several bugs in earlier versions, including
one that was causing stability issues on directory authorities.
o Major bugfixes (directory authority):
- Stop leaking memory on directory authorities when planning to
vote. This bug was crashing authorities by exhausting their
memory. Fixes bug 26435; bugfix on 0.3.3.6.
o Major bugfixes (rust, testing):
- Make sure that failing tests in Rust will actually cause the build
to fail: previously, they were ignored. Fixes bug 26258; bugfix
on 0.3.3.4-alpha.
o Minor feature (directory authorities):
- Stop warning about incomplete bw lines before the first complete
bw line has been found, so that additional header lines can be
ignored. Fixes bug 25960; bugfix on 0.2.2.1-alpha
o Minor features (relay, diagnostic):
- Add several checks to detect whether Tor relays are uploading
their descriptors without specifying why they regenerated them.
Diagnostic for ticket 25686.
o Minor features (unit tests):
- Test complete bandwidth measurements files, and test that
incomplete bandwidth lines only give warnings when the end of the
header has not been detected. Fixes bug 25947; bugfix
on 0.2.2.1-alpha
o Minor bugfixes (compilation):
- Refrain from compiling unit testing related object files when
--disable-unittests is set to configure script. Fixes bug 24891;
bugfix on 0.2.5.1-alpha.
- When linking the libtor_testing.a library, only include the
dirauth object files once. Previously, they were getting added
twice. Fixes bug 26402; bugfix on 0.3.4.1-alpha.
- The --enable-fatal-warnings flag now affects Rust code as well.
Closes ticket 26245.
o Minor bugfixes (onion services):
- Recompute some consensus information after detecting a clock jump,
or after transitioning from a non-live consensus to a live
consensus. We do this to avoid having an outdated state, and
miscalculating the index for next-generation onion services. Fixes
bug 24977; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (relay):
- Relays now correctly block attempts to re-extend to the previous
relay by Ed25519 identity. Previously they would warn in this
case, but not actually reject the attempt. Fixes bug 26158; bugfix
on 0.3.0.1-alpha.
o Minor bugfixes (testing):
- Fix compilation of the doctests in the Rust crypto crate. Fixes
bug 26415; bugfix on 0.3.4.1-alpha.
- Instead of trying to read the geoip configuration files from
within the unit tests, instead create our own ersatz files with
just enough geoip data in the format we expect. Trying to read
from the source directory created problems on Windows with mingw,
where the build system's paths are not the same as the platform's
paths. Fixes bug 25787; bugfix on 0.3.4.1-alpha.
- Refrain from trying to get an item from an empty smartlist in
test_bridges_clear_bridge_list. Set DEBUG_SMARTLIST in unit tests
to catch improper smartlist usage. Furthermore, enable
DEBUG_SMARTLIST globally when build is configured with fragile
hardening. Fixes bug 26196; bugfix on 0.3.4.1-alpha.
Changes in version 0.3.3.7 - 2018-06-12
Tor 0.3.3.7 backports several changes from the 0.3.4.x series, including
fixes for bugs affecting compatibility and stability.
o Directory authority changes:
- Add an IPv6 address for the "dannenberg" directory authority.
Closes ticket 26343.
o Minor features (geoip):
- Update geoip and geoip6 to the June 7 2018 Maxmind GeoLite2
Country database. Closes ticket 26351.
o Minor bugfixes (compatibility, openssl, backport from 0.3.4.2-alpha):
- Work around a change in OpenSSL 1.1.1 where return values that
would previously indicate "no password" now indicate an empty
password. Without this workaround, Tor instances running with
OpenSSL 1.1.1 would accept descriptors that other Tor instances
would reject. Fixes bug 26116; bugfix on 0.2.5.16.
o Minor bugfixes (compilation, backport from 0.3.4.2-alpha):
- Silence unused-const-variable warnings in zstd.h with some GCC
versions. Fixes bug 26272; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (controller, backport from 0.3.4.2-alpha):
- Improve accuracy of the BUILDTIMEOUT_SET control port event's
TIMEOUT_RATE and CLOSE_RATE fields. (We were previously
miscounting the total number of circuits for these field values.)
Fixes bug 26121; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (hardening, backport from 0.3.4.2-alpha):
- Prevent a possible out-of-bounds smartlist read in
protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
o Minor bugfixes (path selection, backport from 0.3.4.1-alpha):
- Only select relays when they have the descriptors we prefer to use
for them. This change fixes a bug where we could select a relay
because it had _some_ descriptor, but reject it later with a
nonfatal assertion error because it didn't have the exact one we
wanted. Fixes bugs 25691 and 25692; bugfix on 0.3.3.4-alpha.
Changes in version 0.3.4.2-alpha - 2018-06-12
Tor 0.3.4.2-alpha fixes several minor bugs in the previous alpha
release, and forward-ports an authority-only security fix from 0.3.3.6.
o Directory authority changes:
- Add an IPv6 address for the "dannenberg" directory authority.
Closes ticket 26343.
o Major bugfixes (security, directory authority, denial-of-service, also in 0.3.3.6):
- Fix a bug that could have allowed an attacker to force a directory
authority to use up all its RAM by passing it a maliciously
crafted protocol versions string. Fixes bug 25517; bugfix on
0.2.9.4-alpha. This issue is also tracked as TROVE-2018-005.
o Minor features (continuous integration):
- Add the necessary configuration files for continuous integration
testing on Windows, via the Appveyor platform. Closes ticket
25549. Patches from Marcin Cieślak and Isis Lovecruft.
o Minor features (geoip):
- Update geoip and geoip6 to the June 7 2018 Maxmind GeoLite2
Country database. Closes ticket 26351.
o Minor bugfixes (compatibility, openssl):
- Work around a change in OpenSSL 1.1.1 where return values that
would previously indicate "no password" now indicate an empty
password. Without this workaround, Tor instances running with
OpenSSL 1.1.1 would accept descriptors that other Tor instances
would reject. Fixes bug 26116; bugfix on 0.2.5.16.
o Minor bugfixes (compilation):
- Silence unused-const-variable warnings in zstd.h with some GCC
versions. Fixes bug 26272; bugfix on 0.3.1.1-alpha.
- Fix compilation when using OpenSSL 1.1.0 with the "no-deprecated"
flag enabled. Fixes bug 26156; bugfix on 0.3.4.1-alpha.
- Avoid a compiler warning when casting the return value of
smartlist_len() to double with DEBUG_SMARTLIST enabled. Fixes bug
26283; bugfix on 0.2.4.10-alpha.
o Minor bugfixes (control port):
- Do not count 0-length RELAY_COMMAND_DATA cells as valid data in
CIRC_BW events. Previously, such cells were counted entirely in
the OVERHEAD field. Now they are not. Fixes bug 26259; bugfix
on 0.3.4.1-alpha.
o Minor bugfixes (controller):
- Improve accuracy of the BUILDTIMEOUT_SET control port event's
TIMEOUT_RATE and CLOSE_RATE fields. (We were previously
miscounting the total number of circuits for these field values.)
Fixes bug 26121; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (hardening):
- Prevent a possible out-of-bounds smartlist read in
protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
o Minor bugfixes (onion services):
- Fix a bug that blocked the creation of ephemeral v3 onion
services. Fixes bug 25939; bugfix on 0.3.4.1-alpha.
o Minor bugfixes (test coverage tools):
- Update our "cov-diff" script to handle output from the latest
version of gcov, and to remove extraneous timestamp information
from its output. Fixes bugs 26101 and 26102; bugfix
on 0.2.5.1-alpha.
Changes in version 0.3.3.6 - 2018-05-22
Tor 0.3.3.6 is the first stable release in the 0.3.3 series. It
backports several important fixes from the 0.3.4.1-alpha.
The Tor 0.3.3 series includes controller support and other
improvements for v3 onion services, official support for embedding Tor
within other applications, and our first non-trivial module written in
the Rust programming language. (Rust is still not enabled by default
when building Tor.) And as usual, there are numerous other smaller
bugfixes, features, and improvements.
Below are the changes since 0.3.3.5-rc. For a list of all changes
since 0.3.2.10, see the ReleaseNotes file.
o Major bugfixes (directory authorities, security, backport from 0.3.4.1-alpha):
- When directory authorities read a zero-byte bandwidth file, they
would previously log a warning with the contents of an
uninitialised buffer. They now log a warning about the empty file
instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
o Major bugfixes (security, directory authority, denial-of-service):
- Fix a bug that could have allowed an attacker to force a directory
authority to use up all its RAM by passing it a maliciously
crafted protocol versions string. Fixes bug 25517; bugfix on
0.2.9.4-alpha. This issue is also tracked as TROVE-2018-005.
o Major bugfixes (crash, backport from 0.3.4.1-alpha):
- Avoid a rare assertion failure in the circuit build timeout code
if we fail to allow any circuits to actually complete. Fixes bug
25733; bugfix on 0.2.2.2-alpha.
o Major bugfixes (directory authorities, backport from 0.3.4.1-alpha):
- Avoid a crash when testing router reachability on a router that
could have an ed25519 ID, but which does not. Fixes bug 25415;
bugfix on 0.3.3.2-alpha.
o Major bugfixes (onion service, backport from 0.3.4.1-alpha):
- Correctly detect when onion services get disabled after HUP. Fixes
bug 25761; bugfix on 0.3.2.1.
o Major bugfixes (relay, denial of service, backport from 0.3.4.1-alpha):
- Impose a limit on circuit cell queue size. The limit can be
controlled by a consensus parameter. Fixes bug 25226; bugfix
on 0.2.4.14-alpha.
o Minor features (compatibility, backport from 0.3.4.1-alpha):
- Avoid some compilation warnings with recent versions of LibreSSL.
Closes ticket 26006.
o Minor features (continuous integration, backport from 0.3.4.1-alpha):
- Our .travis.yml configuration now includes support for testing the
results of "make distcheck". (It's not uncommon for "make check"
to pass but "make distcheck" to fail.) Closes ticket 25814.
- Our Travis CI configuration now integrates with the Coveralls
coverage analysis tool. Closes ticket 25818.
o Minor features (geoip):
- Update geoip and geoip6 to the May 1 2018 Maxmind GeoLite2 Country
database. Closes ticket 26104.
o Minor bugfixes (client, backport from 0.3.4.1-alpha):
- Don't consider Tor running as a client if the ControlPort is open,
but no actual client ports are open. Fixes bug 26062; bugfix
on 0.2.9.4-alpha.
o Minor bugfixes (correctness, client, backport from 0.3.4.1-alpha):
- Upon receiving a malformed connected cell, stop processing the
cell immediately. Previously we would mark the connection for
close, but continue processing the cell as if the connection were
open. Fixes bug 26072; bugfix on 0.2.4.7-alpha.
o Minor bugfixes (documentation, backport from 0.3.4.1-alpha):
- Stop saying in the manual that clients cache ipv4 dns answers from
exit relays. We haven't used them since 0.2.6.3-alpha, and in
ticket 24050 we stopped even caching them as of 0.3.2.6-alpha, but
we forgot to say so in the man page. Fixes bug 26052; bugfix
on 0.3.2.6-alpha.
o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.4.1-alpha):
- Allow the nanosleep() system call, which glibc uses to implement
sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (onion service, backport from 0.3.4.1-alpha):
- Fix a memory leak when a v3 onion service is configured and gets a
SIGHUP signal. Fixes bug 25901; bugfix on 0.3.2.1-alpha.
- When parsing the descriptor signature, look for the token plus an
extra white-space at the end. This is more correct but also will
allow us to support new fields that might start with "signature".
Fixes bug 26069; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (relay, crash, backport from 0.3.4.1-alpha):
- Avoid a crash when running with DirPort set but ORPort turned off.
Fixes a case of bug 23693; bugfix on 0.3.1.1-alpha.
o Documentation (backport from 0.3.4.1-alpha):
- Correct an IPv6 error in the documentation for ExitPolicy. Closes
ticket 25857. Patch from "CTassisF".
Changes in version 0.3.4.1-alpha - 2018-05-17
Tor 0.3.4.1-alpha is the first release in the 0.3.4.x series. It
includes refactoring to begin reducing Tor's binary size and idle CPU
usage on mobile, along with prep work for new bandwidth scanners,
improvements to the experimental "vanguards" feature, and numerous
other small features and bugfixes.
o New system requirements:
- Tor no longer tries to support old operating systems without
mmap() or some local equivalent. Apparently, compilation on such
systems has been broken for some time, without anybody noticing or
complaining. Closes ticket 25398.
o Major feature (directory authority, modularization):
- The directory authority subsystem has been modularized. The code
is now located in src/or/dirauth/, and is compiled in by default.
To disable the module, the configure option
--disable-module-dirauth has been added. This module may be
disabled by default in some future release. Closes ticket 25610.
o Major features (main loop, CPU usage):
- When Tor is disabled (via DisableNetwork or via hibernation), it
no longer needs to run any per-second events. This change should
make it easier for mobile applications to disable Tor while the
device is sleeping, or Tor is not running. Closes ticket 26063.
- Tor no longer enables all of its periodic events by default.
Previously, Tor would enable all possible main loop events,
regardless of whether it needed them. Furthermore, many of these
events are now disabled with Tor is hibernating or DisableNetwork
is set. This is a big step towards reducing client CPU usage by
reducing the amount of wake-ups the daemon does. Closes ticket
25376 and 25762.
- The bandwidth-limitation logic has been refactored so that
bandwidth calculations are performed on-demand, rather than every
TokenBucketRefillInterval milliseconds. This change should improve
the granularity of our bandwidth calculations, and limit the
number of times that the Tor process needs to wake up when it is
idle. Closes ticket 25373.
- Move responsibility for many operations from a once-per-second
callback to a callback that is only scheduled as needed. Moving
this functionality has allowed us to disable the callback when
Tor's network is disabled. Once enough items are removed from our
once-per-second callback, we can eliminate it entirely to conserve
CPU when idle. The functionality removed includes: closing
connections, circuits, and channels (ticket 25932); consensus
voting (25937); flushing log callbacks (25951); honoring delayed
SIGNEWNYM requests (25949); rescanning the consensus cache
(25931); saving the state file to disk (25948); warning relay
operators about unreachable ports (25952); and keeping track of
Tor's uptime (26009).
o Major bugfixes (directory authorities, security):
- When directory authorities read a zero-byte bandwidth file, they
would previously log a warning with the contents of an
uninitialised buffer. They now log a warning about the empty file
instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
o Major bugfixes (crash):
- Avoid a rare assertion failure in the circuit build timeout code
if we fail to allow any circuits to actually complete. Fixes bug
25733; bugfix on 0.2.2.2-alpha.
o Major bugfixes (directory authority):
- Avoid a crash when testing router reachability on a router that
could have an ed25519 ID, but which does not. Fixes bug 25415;
bugfix on 0.3.3.2-alpha.
o Major bugfixes (onion service):
- Correctly detect when onion services get disabled after HUP. Fixes
bug 25761; bugfix on 0.3.2.1.
o Major bugfixes (protover, voting):
- Revise Rust implementation of protover to use a more memory-
efficient voting algorithm and corresponding data structures, thus
avoiding a potential (but small impact) DoS attack where specially
crafted protocol strings would expand to several potential
megabytes in memory. In the process, several portions of code were
revised to be methods on new, custom types, rather than functions
taking interchangeable types, thus increasing type safety of the
module. Custom error types and handling were added as well, in
order to facilitate better error dismissal/handling in outside
crates and avoid mistakenly passing an internal error string to C
over the FFI boundary. Many tests were added, and some previous
differences between the C and Rust implementations have been
remedied. Fixes bug 24031; bugfix on 0.3.3.1-alpha.
o Major bugfixes (relay, denial of service):
- Impose a limit on circuit cell queue size. The limit can be
controlled by a consensus parameter. Fixes bug 25226; bugfix
on 0.2.4.14-alpha.
o Minor features (accounting):
- When Tor becomes dormant, it now uses a scheduled event to wake up
at the right time. Previously, we would use the per-second timer
to check whether to wake up, but we no longer have any per-second
timers enabled when the network is disabled. Closes ticket 26064.
o Minor features (code quality):
- Add optional spell-checking for the Tor codebase, using the
"misspell" program. To use this feature, run "make check-typos".
Closes ticket 25024.
o Minor features (compatibility):
- Tor now detects versions of OpenSSL 1.1.0 and later compiled with
the no-deprecated option, and builds correctly with them. Closes
tickets 19429, 19981, and 25353.
- Avoid some compilation warnings with recent versions of LibreSSL.
Closes ticket 26006.
o Minor features (compression, zstd):
- When running with zstd, Tor now considers using advanced functions
that the zstd maintainers have labeled as potentially unstable. To
prevent breakage, Tor will only use this functionality when the
runtime version of the zstd library matches the version with which
Tor was compiled. Closes ticket 25162.
o Minor features (configuration):
- The "DownloadSchedule" options have been renamed to end with
"DownloadInitialDelay". The old names are still allowed, but will
produce a warning. Comma-separated lists are still permitted for
these options, but all values after the first are ignored (as they
have been since 0.2.9). Closes ticket 23354.
o Minor features (continuous integration):
- Our .travis.yml configuration now includes support for testing the
results of "make distcheck". (It's not uncommon for "make check"
to pass but "make distcheck" to fail.) Closes ticket 25814.
- Our Travis CI configuration now integrates with the Coveralls
coverage analysis tool. Closes ticket 25818.
o Minor features (control port):
- Introduce GETINFO "current-time/{local,utc}" to return the local
and UTC times respectively in ISO format. This helps a controller
like Tor Browser detect a time-related error. Closes ticket 25511.
Patch by Neel Chauhan.
- Introduce new fields to the CIRC_BW event. There are two new
fields in each of the read and written directions. The DELIVERED
fields report the total valid data on the circuit, as measured by
the payload sizes of verified and error-checked relay command
cells. The OVERHEAD fields report the total unused bytes in each
of these cells. Closes ticket 25903.
o Minor features (directory authority):
- Directory authorities now open their key-pinning files as O_SYNC,
to limit their chances of accidentally writing partial lines.
Closes ticket 23909.
o Minor features (directory authority, forward compatibility):
- Make the lines of the measured bandwidth file able to contain
their entries in any order. Previously, the node_id entry needed
to come first. Closes ticket 26004.
o Minor features (entry guards):
- Introduce a new torrc option NumPrimaryGuards for controlling the
number of primary guards. Closes ticket 25843.
o Minor features (geoip):
- Update geoip and geoip6 to the May 1 2018 Maxmind GeoLite2 Country
database. Closes ticket 26104.
o Minor features (performance):
- Avoid a needless call to malloc() when processing an incoming
relay cell. Closes ticket 24914.
- Make our timing-wheel code run a tiny bit faster on 32-bit
platforms, by preferring 32-bit math to 64-bit. Closes
ticket 24688.
- Avoid a needless malloc()/free() pair every time we handle an ntor
handshake. Closes ticket 25150.
o Minor features (testing):
- Add a unit test for voting_schedule_get_start_of_next_interval().
Closes ticket 26014, and helps make unit test coverage
more deterministic.
- A new unittests module specifically for testing the functions in
the (new-ish) bridges.c module has been created with new
unittests, raising the code coverage percentages. Closes 25425.
- We now have improved testing for addressmap_get_virtual_address()
function. This should improve our test coverage, and make our test
coverage more deterministic. Closes ticket 25993.
o Minor features (timekeeping, circuit scheduling):
- When keeping track of how busy each circuit have been recently on
a given connection, use coarse-grained monotonic timers rather
than gettimeofday(). This change should marginally increase
accuracy and performance. Implements part of ticket 25927.
o Minor bugfixes (bandwidth management):
- Consider ourselves "low on write bandwidth" if we have exhausted
our write bandwidth some time in the last second. This was the
documented behavior before, but the actual behavior was to change
this value every TokenBucketRefillInterval. Fixes bug 25828;
bugfix on 0.2.3.5-alpha.
o Minor bugfixes (C correctness):
- Add a missing lock acquisition in the shutdown code of the control
subsystem. Fixes bug 25675; bugfix on 0.2.7.3-rc. Found by
Coverity; this is CID 1433643.
o Minor bugfixes (circuit path selection):
- Don't count path selection failures as circuit build failures.
This change should eliminate cases where Tor blames its guard or
the network for situations like insufficient microdescriptors
and/or overly restrictive torrc settings. Fixes bug 25705; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (client):
- Don't consider Tor running as a client if the ControlPort is open,
but no actual client ports are open. Fixes bug 26062; bugfix
on 0.2.9.4-alpha.
o Minor bugfixes (code style):
- Fixed multiple includes of transports.h in src/or/connection.c
Fixes bug 25261; bugfix on 0.2.5.1-alpha.
- Remove the unused variable n_possible from the function
channel_get_for_extend(). Fixes bug 25645; bugfix on 0.2.4.4-alpha
o Minor bugfixes (control interface):
- Respond with more human-readable error messages to GETINFO exit-
policy/* requests. Also, let controller know if an error is
transient (response code 551) or not (response code 552). Fixes
bug 25852; bugfix on 0.2.8.1-alpha.
o Minor bugfixes (controller):
- Make CIRC_BW event reflect the total of all data sent on a
circuit, including padding and dropped cells. Also fix a mis-
counting bug when STREAM_BW events were enabled. Fixes bug 25400;
bugfix on 0.2.5.2-alpha.
o Minor bugfixes (correctness, client):
- Upon receiving a malformed connected cell, stop processing the cell
immediately. Previously we would mark the connection for close, but
continue processing the cell as if the connection were open. Fixes bug
26072; bugfix on 0.2.4.7-alpha.
o Minor bugfixes (directory client):
- When unverified-consensus is verified, rename it to cached-
consenus. Fixes bug 4187; bugfix on 0.2.0.3-alpha.
- Fixed launching a certificate fetch always during the scheduled
periodic consensus fetch by fetching only in those cases when
consensus are waiting for certs. Fixes bug 24740; bugfix
on 0.2.9.1-alpha.
o Minor bugfixes (documentation):
- Stop saying in the manual that clients cache ipv4 dns answers from
exit relays. We haven't used them since 0.2.6.3-alpha, and in
ticket 24050 we stopped even caching them as of 0.3.2.6-alpha, but
we forgot to say so in the man page. Fixes bug 26052; bugfix
on 0.3.2.6-alpha.
o Minor bugfixes (error reporting):
- Improve tolerance for directory authorities with skewed clocks.
Previously, an authority with a clock more than 60 seconds ahead
could cause a client with a correct clock to warn that the
client's clock was behind. Now the clocks of a majority of
directory authorities have to be ahead of the client before this
warning will occur. Fixes bug 25756; bugfix on 0.2.2.25-alpha.
o Minor bugfixes (Linux seccomp2 sandbox):
- Allow the nanosleep() system call, which glibc uses to implement
sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (onion service):
- Fix a memory leak when a v3 onion service is configured and gets a
SIGHUP signal. Fixes bug 25901; bugfix on 0.3.2.1-alpha.
- When parsing the descriptor signature, look for the token plus an
extra white-space at the end. This is more correct but also will
allow us to support new fields that might start with "signature".
Fixes bug 26069; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (path selection):
- Only select relays when they have the descriptors we prefer to use
for them. This change fixes a bug where we could select a relay
because it had _some_ descriptor, but reject it later with a
nonfatal assertion error because it didn't have the exact one we
wanted. Fixes bugs 25691 and 25692; bugfix on 0.3.3.4-alpha.
o Minor bugfixes (portability):
- Do not align mmap length, as it is not required by POSIX, and the
getpagesize function is deprecated. Fixes bug 25399; bugfix
on 0.1.1.23.
o Minor bugfixes (portability, FreeBSD):
- In have_enough_mem_for_dircache(), the variable DIRCACHE_MIN_MEM_MB
does not stringify on FreeBSD, so we switch to tor_asprintf().
Fixes bug 20887; bugfix on 0.2.8.1-alpha. Patch by Neel Chauhan.
o Minor bugfixes (relay statistics):
- When a relay is collecting internal statistics about how many
create cell requests it has seen of each type, accurately count
the requests from relays that temporarily fall out of the
consensus. (To be extra conservative, we were already ignoring
requests from clients in our counts, and we continue ignoring them
here.) Fixes bug 24910; bugfix on 0.2.4.17-rc.
o Minor bugfixes (relay, crash):
- Avoid a crash when running with DirPort set but ORPort turned off.
Fixes a case of bug 23693; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (restart-in-process):
- When shutting down, Tor now clears all the flags in the control.c
module. This should prevent a bug where authentication cookies are
not generated on restart. Fixes bug 25512; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (testing):
- When testing workqueue event-cancellation, make sure that we
actually cancel an event, and that cancel each event with equal
probability. (It was previously possible, though extremely
unlikely, for our event-canceling test not to cancel any events.)
Fixes bug 26008; bugfix on 0.2.6.3-alpha.
- Repeat part of the test in test_client_pick_intro() a number of
times, to give it consistent coverage. Fixes bug 25996; bugfix
on 0.3.2.1-alpha.
- Remove randomness from the hs_common/responsible_hsdirs test, so
that it always takes the same path through the function it tests.
Fixes bug 25997; bugfix on 0.3.2.1-alpha.
- Change the behavior of the "channel/outbound" test so that it
never causes a 10-second rollover for the EWMA circuitmux code.
Previously, this behavior would happen randomly, and result in
fluctuating test coverage. Fixes bug 25994; bugfix
on 0.3.3.1-alpha.
- Use X509_new() to allocate certificates that will be freed later
with X509_free(). Previously, some parts of the unit tests had
used tor_malloc_zero(), which is incorrect, and which caused test
failures on Windows when they were built with extra hardening.
Fixes bugs 25943 and 25944; bugfix on 0.2.8.1-alpha. Patch by
Marcin Cieślak.
- While running the circuit_timeout test, fix the PRNG to a
deterministic AES stream, so that the test coverage from this test
will itself be deterministic. Fixes bug 25995; bugfix
on 0.2.2.2-alpha.
o Minor bugfixes (vanguards):
- Allow the last hop in a vanguard circuit to be the same as our
first, to prevent the adversary from influencing guard node choice
by choice of last hop. Also prevent the creation of A - B - A
paths, or A - A paths, which are forbidden by relays. Fixes bug
25870; bugfix on 0.3.3.1-alpha.
o Code simplification and refactoring:
- Remove duplicate code in parse_{c,s}method_line and bootstrap
their functionalities into a single function. Fixes bug 6236;
bugfix on 0.2.3.6-alpha.
- We remove the PortForwarding and PortForwardingHelper options,
related functions, and the port_forwarding tests. These options
were used by the now-deprecated Vidalia to help ordinary users
become Tor relays or bridges. Closes ticket 25409. Patch by
Neel Chauhan.
- In order to make the OR and dir checking function in router.c less
confusing we renamed some functions and
consider_testing_reachability() has been split into
router_should_check_reachability() and
router_do_reachability_checks(). Also we improved the documentation
in some functions. Closes ticket 18918.
- Initial work to isolate Libevent usage to a handful of modules in
our codebase, to simplify our call structure, and so that we can
more easily change event loops in the future if needed. Closes
ticket 23750.
- Introduce a function to call getsockname() and return tor_addr_t,
to save a little complexity throughout the codebase. Closes
ticket 18105.
- Make hsdir_index in node_t a hsdir_index_t rather than a pointer
as hsdir_index is always present. Also, we move hsdir_index_t into
or.h. Closes ticket 23094. Patch by Neel Chauhan.
- Merge functions used for describing nodes and suppress the
functions that do not allocate memory for the output buffer
string. NODE_DESC_BUF_LEN constant and format_node_description()
function cannot be used externally from router.c module anymore.
Closes ticket 25432. Patch by valentecaio.
- Our main loop has been simplified so that all important operations
happen inside events. Previously, some operations had to happen
outside the event loop, to prevent infinite sequences of event
activations. Closes ticket 25374.
- Put a SHA1 public key digest in hs_service_intro_point_t, and use
it in register_intro_circ() and service_intro_point_new(). This
prevents the digest from being re-calculated each time. Closes
ticket 23107. Patch by Neel Chauhan.
- Refactor token-bucket implementations to use a common backend.
Closes ticket 25766.
- Remove extern declaration of stats_n_seconds_working variable from
main, protecting its accesses with get_uptime() and reset_uptime()
functions. Closes ticket 25081, patch by “valentecaio”.
- Remove our previous logic for "cached gettimeofday()" -- our
coarse monotonic timers are fast enough for this purpose, and far
less error-prone. Implements part of ticket 25927.
- Remove the return value for fascist_firewall_choose_address_base(),
and sister functions such as fascist_firewall_choose_address_node()
and fascist_firewall_choose_address_rs(). Also, while we're here,
initialize the ap argument as leaving it uninitialized can pose a
security hazard. Closes ticket 24734. Patch by Neel Chauhan.
- Rename two fields of connection_t struct. timestamp_lastwritten is
renamed to timestamp_last_write_allowed and timestamp_lastread is
renamed to timestamp_last_read_allowed. Closes ticket 24714, patch
by "valentecaio".
- Since Tor requires C99, remove our old workaround code for libc
implementations where free(NULL) doesn't work. Closes ticket 24484.
- Use our standard rate-limiting code to deal with excessive
libevent failures, rather than the hand-rolled logic we had
before. Closes ticket 26016.
- We remove the return value of node_get_prim_orport() and
node_get_prim_dirport(), and introduce node_get_prim_orport() in
node_ipv6_or_preferred() and node_ipv6_dir_preferred() in order to
check for a null address. Closes ticket 23873. Patch by
Neel Chauhan.
- We switch to should_record_bridge_info() in
geoip_note_client_seen() and options_need_geoip_info() instead of
accessing the configuration values directly. Fixes bug 25290;
bugfix on 0.2.1.6-alpha. Patch by Neel Chauhan.
o Deprecated features:
- As we are not recommending 0.2.5 anymore, we require relays that
once had an ed25519 key associated with their RSA key to always
have that key, instead of allowing them to drop back to a version
that didn't support ed25519. This means they need to use a new RSA
key if they want to downgrade to an older version of tor without
ed25519. Closes ticket 20522.
o Documentation:
- Correct an IPv6 error in the documentation for ExitPolicy. Closes
ticket 25857. Patch from "CTassisF".
o Removed features:
- Directory authorities will no longer support voting according to
any consensus method before consensus method 25. This keeps
authorities compatible with all authorities running 0.2.9.8 and
later, and does not break any clients or relays. Implements ticket
24378 and proposal 290.
- The PortForwarding and PortForwardingHelper features have been
removed. The reasoning is, given that implementations of NAT
traversal protocols within common consumer grade routers are
frequently buggy, and that the target audience for a NAT punching
feature is a perhaps less-technically-inclined relay operator,
when the helper fails to setup traversal the problems are usually
deep, ugly, and very router specific, making them horrendously
impossible for technical support to reliable assist with, and thus
resulting in frustration all around. Unfortunately, relay
operators who would like to run relays behind NATs will need to
become more familiar with the port forwarding configurations on
their local router. Closes 25409.
- The TestingEnableTbEmptyEvent option has been removed. It was used
in testing simulations to measure how often connection buckets
were emptied, in order to improve our scheduling, but it has not
been actively used in years. Closes ticket 25760.
- The old "round-robin" circuit multiplexer (circuitmux)
implementation has been removed, along with a fairly large set of
code that existed to support it. It has not been the default
circuitmux since we introduced the "EWMA" circuitmux in 0.2.4.x,
but it still required an unreasonable amount of memory and CPU.
Closes ticket 25268.
Changes in version 0.3.3.5-rc - 2018-04-15
Tor 0.3.3.5-rc fixes various bugs in earlier versions of Tor,
including some that could affect reliability or correctness.
This is the first release candidate in the 0.3.3 series. If we find no
new bugs or regression here, then the first stable 0.3.3 release will
be nearly identical to this one.
o Major bugfixes (security, protover, voting):
- Revise Rust implementation of protover to use a more memory-
efficient voting algorithm and corresponding data structures, thus
avoiding a potential memory-based DoS attack where specially
crafted protocol strings would expand to fill available memory.
Fixes bug 24031; bugfix on 0.3.3.1-alpha.
o Major bugfixes (performance, load balancing):
- Directory authorities no longer vote in favor of the Guard flag
for relays without directory support. Starting in Tor
0.3.0.1-alpha, clients have been avoiding using such relays in the
Guard position, leading to increasingly broken load balancing for
the 5%-or-so of Guards that don't advertise directory support.
Fixes bug 22310; bugfix on 0.3.0.6.
o Minor feature (continuous integration):
- Update the Travis CI configuration to use the stable Rust channel,
now that we have decided to require that. Closes ticket 25714.
o Minor features (config options):
- Change the way the default value for MaxMemInQueues is calculated.
We now use 40% of the hardware RAM if the system has 8 GB RAM or
more. Otherwise we use the former value of 75%. Closes
ticket 24782.
o Minor features (geoip):
- Update geoip and geoip6 to the April 3 2018 Maxmind GeoLite2
Country database. Closes ticket 25718.
o Minor bugfixes (client):
- When using a listed relay as a bridge, and also using
microdescriptors, and considering that relay as a non-bridge in a
circuit, treat its microdescriptor as a valid source of
information about that relay. This change should prevent a non-
fatal assertion error. Fixes bug 25691; bugfix on 0.3.3.4-alpha.
o Minor bugfixes (controller):
- Restore the correct operation of the RESOLVE command, which had
been broken since we added the ability to enable/disable DNS on
specific listener ports. Fixes bug 25617; bugfix on 0.2.9.3-alpha.
o Minor bugfixes (distribution, compilation, rust):
- Build correctly when the rust dependencies submodule is loaded,
but the TOR_RUST_DEPENDENCIES environment variable is not set.
Fixes bug 25679; bugfix on 0.3.3.1-alpha.
- Actually include all of our Rust source in our source
distributions. (Previously, a few of the files were accidentally
omitted.) Fixes bug 25732; bugfix on 0.3.3.2-alpha.
o Minor bugfixes (documentation):
- Document that the PerConnBW{Rate,Burst} options will fall back to
their corresponding consensus parameters only if those parameters
are set. Previously we had claimed that these values would always
be set in the consensus. Fixes bug 25296; bugfix on 0.2.2.7-alpha.
- Revert a misformatting issue in the ExitPolicy documentation.
Fixes bug 25582; bugfix on 0.3.3.1-alpha.
o Minor bugfixes (exit relay DNS retries):
- Re-attempt timed-out DNS queries 3 times before failure, since our
timeout is 5 seconds for them, but clients wait 10-15. Also allow
slightly more timeouts per resolver when an exit has multiple
resolvers configured. Fixes bug 21394; bugfix on 0.3.1.9.
o Minor bugfixes (onion services):
- Re-instate counting the client HSDir fetch circuits against the
MaxClientCircuitsPending rate limit. Fixes bug 24989; bugfix
on 0.3.3.1-alpha.
- Remove underscores from the _HSLayer{2,3}Nodes options. This
expert-user configuration can now be enabled as HSLayer{2,3}Nodes.
Fixes bug 25581; bugfix on 0.3.3.1-alpha
o Code simplification and refactoring:
- Move the list of default directory authorities to its own file.
Closes ticket 24854. Patch by "beastr0".
o Documentation (manpage, denial of service):
- Provide more detail about the denial-of-service options, by
listing each mitigation and explaining how they relate. Closes
ticket 25248.
Changes in version 0.3.3.4-alpha - 2018-03-29
Tor 0.3.3.4-alpha includes various bugfixes for issues found during
the alpha testing of earlier releases in its series. We are
approaching a stable 0.3.3.4-alpha release: more testing is welcome!
o New system requirements:
- When built with Rust, Tor now depends on version 0.2.39 of the
libc crate. Closes tickets 25310 and 25664.
o Major bugfixes (relay, connection):
- If we have failed to connect to a relay and received a connection
refused, timeout, or similar error (at the TCP level), do not try
that same address/port again for 60 seconds after the failure has
occurred. Fixes bug 24767; bugfix on 0.0.6.
o Minor features (geoip):
- Update geoip and geoip6 to the March 8 2018 Maxmind GeoLite2
Country database. Closes ticket 25469.
o Minor features (log messages):
- Improve log message in the out-of-memory handler to include
information about memory usage from the different compression
backends. Closes ticket 25372.
o Minor features (sandbox):
- Explicitly permit the poll() system call when the Linux
seccomp2-based sandbox is enabled: apparently, some versions of
libc use poll() when calling getpwnam(). Closes ticket 25313.
o Minor bugfixes (C correctness):
- Fix a very unlikely (impossible, we believe) null pointer
dereference. Fixes bug 25629; bugfix on 0.2.9.15. Found by
Coverity; this is CID 1430932.
o Minor bugfixes (channel, client):
- Better identify client connection when reporting to the geoip
client cache. Fixes bug 24904; bugfix on 0.3.1.7.
o Minor bugfixes (compilation):
- Fix a C99 compliance issue in our configuration script that caused
compilation issues when compiling Tor with certain versions of
xtools. Fixes bug 25474; bugfix on 0.3.2.5-alpha.
o Minor bugfixes (controller, reliability):
- Avoid a (nonfatal) assertion failure when extending a one-hop
circuit from the controller to become a multihop circuit. Fixes
bug 24903; bugfix on 0.2.5.2-alpha.
o Major bugfixes (networking):
- Tor will no longer reject IPv6 address strings from Tor Browser
when they are passed as hostnames in SOCKS5 requests. Fixes bug
25036, bugfix on Tor 0.3.1.2.
o Minor bugfixes (networking):
- string_is_valid_hostname() will not consider IP strings to be
valid hostnames. Fixes bug 25055; bugfix on Tor 0.2.5.5.
o Minor bugfixes (onion service v3):
- Avoid an assertion failure when the next onion service
descriptor rotation type is out of sync with the consensus's
valid-after time. Instead, log a warning message with extra
information, so we can better hunt down the cause of this
assertion. Fixes bug 25306; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (testing):
- Avoid intermittent test failures due to a test that had relied on
onion service introduction point creation finishing within 5
seconds of real clock time. Fixes bug 25450; bugfix
on 0.3.1.3-alpha.
- Rust crates are now automatically detected and tested. Previously,
some crates were not tested by `make test-rust` due to a static
string in the `src/test/test_rust.sh` script specifying which
crates to test. Fixes bug 25560; bugfix on 0.3.3.3-alpha.
o Minor bugfixes (testing, benchmarks):
- Fix a crash when running benchmark tests on win32 systems. The
crash was due to a mutex that wasn't initialized before logging
and options were initialized. Fixes bug 25479; bugfix
on 0.3.3.3-alpha.
o Minor bugfixes (warnings, ipv6):
- Avoid a bug warning that could occur when trying to connect to a
relay over IPv6. This warning would occur on a Tor instance that
downloads router descriptors, but prefers to use microdescriptors.
Fixes bug 25213; bugfix on 0.3.3.1-alpha.
o Code simplification and refactoring:
- Remove the old (deterministic) directory retry logic entirely:
We've used exponential backoff exclusively for some time. Closes
ticket 23814.
o Documentation:
- Improved the documentation of AccountingStart parameter. Closes
ticket 23635.
- Update the documentation for "Log" to include the current list of
logging domains. Closes ticket 25378.
Changes in version 0.3.1.10 - 2018-03-03
Tor 0.3.1.10 backports a number of bugfixes, including important fixes for
security issues.
It includes an important security fix for a remote crash attack
against directory authorities, tracked as TROVE-2018-001.
This release also backports our new system for improved resistance to
denial-of-service attacks against relays.
This release also fixes several minor bugs and annoyances from
earlier releases.
All directory authorities should upgrade to one of the versions
released today. Relays running 0.3.1.x may wish to update to one of
the versions released today, for the DoS mitigations.
Please note: according to our release calendar, Tor 0.3.1 will no
longer be supported after 1 July 2018. If you will be running Tor
after that date, you should make sure to plan to upgrade to the latest
stable version, or downgrade to 0.2.9 (which will receive long-term
support).
o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
- Fix a protocol-list handling bug that could be used to remotely crash
directory authorities with a null-pointer exception. Fixes bug 25074;
bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
CVE-2018-0490.
o Major features (denial-of-service mitigation, backport from 0.3.3.2-alpha):
- Give relays some defenses against the recent network overload. We
start with three defenses (default parameters in parentheses).
First: if a single client address makes too many concurrent
connections (>100), hang up on further connections. Second: if a
single client address makes circuits too quickly (more than 3 per
second, with an allowed burst of 90) while also having too many
connections open (3), refuse new create cells for the next while
(1-2 hours). Third: if a client asks to establish a rendezvous
point to you directly, ignore the request. These defenses can be
manually controlled by new torrc options, but relays will also
take guidance from consensus parameters, so there's no need to
configure anything manually. Implements ticket 24902.
o Minor features (linux seccomp2 sandbox, backport from 0.3.2.5-alpha):
- Update the sandbox rules so that they should now work correctly
with Glibc 2.26. Closes ticket 24315.
o Major bugfixes (onion services, retry behavior, backport from 0.3.3.1-alpha):
- Fix an "off by 2" error in counting rendezvous failures on the
onion service side. While we thought we would stop the rendezvous
attempt after one failed circuit, we were actually making three
circuit attempts before giving up. Now switch to a default of 2,
and allow the consensus parameter "hs_service_max_rdv_failures" to
override. Fixes bug 24895; bugfix on 0.0.6.
o Major bugfixes (protocol versions, backport from 0.3.3.2-alpha):
- Add Link protocol version 5 to the supported protocols list. Fixes
bug 25070; bugfix on 0.3.1.1-alpha.
o Major bugfixes (relay, backport from 0.3.3.1-alpha):
- Fix a set of false positives where relays would consider
connections to other relays as being client-only connections (and
thus e.g. deserving different link padding schemes) if those
relays fell out of the consensus briefly. Now we look only at the
initial handshake and whether the connection authenticated as a
relay. Fixes bug 24898; bugfix on 0.3.1.1-alpha.
o Minor features (denial-of-service avoidance, backport from 0.3.3.2-alpha):
- Make our OOM handler aware of the geoip client history cache so it
doesn't fill up the memory. This check is important for IPv6 and
our DoS mitigation subsystem. Closes ticket 25122.
o Minor feature (relay statistics, backport from 0.3.2.6-alpha):
- Change relay bandwidth reporting stats interval from 4 hours to 24
hours in order to reduce the efficiency of guard discovery
attacks. Fixes ticket 23856.
o Minor features (compatibility, OpenSSL, backport from 0.3.3.3-alpha):
- Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
Previous versions of Tor would not have worked with OpenSSL 1.1.1,
since they neither disabled TLS 1.3 nor enabled any of the
ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
Closes ticket 24978.
o Minor features (fallback directory mirrors, backport from 0.3.2.9):
- The fallback directory list has been re-generated based on the
current status of the network. Tor uses fallback directories to
bootstrap when it doesn't yet have up-to-date directory
information. Closes ticket 24801.
- Make the default DirAuthorityFallbackRate 0.1, so that clients
prefer to bootstrap from fallback directory mirrors. This is a
follow-up to 24679, which removed weights from the default
fallbacks. Implements ticket 24681.
o Minor features (geoip):
- Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
Country database.
o Minor bugfix (channel connection, backport from 0.3.3.2-alpha):
- Use the actual observed address of an incoming relay connection,
not the canonical address of the relay from its descriptor, when
making decisions about how to handle the incoming connection.
Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
o Minor bugfix (directory authority, backport from 0.3.3.2-alpha):
- Directory authorities, when refusing a descriptor from a rejected
relay, now explicitly tell the relay (in its logs) to set a valid
ContactInfo address and contact the bad-relays@ mailing list.
Fixes bug 25170; bugfix on 0.2.9.1.
o Minor bugfixes (address selection, backport from 0.3.2.9):
- When the fascist_firewall_choose_address_ functions don't find a
reachable address, set the returned address to the null address
and port. This is a precautionary measure, because some callers do
not check the return value. Fixes bug 24736; bugfix
on 0.2.8.2-alpha.
o Major bugfixes (bootstrapping, backport from 0.3.2.5-alpha):
- Fetch descriptors aggressively whenever we lack enough to build
circuits, regardless of how many descriptors we are missing.
Previously, we would delay launching the fetch when we had fewer
than 15 missing descriptors, even if some of those descriptors
were blocking circuits from building. Fixes bug 23985; bugfix on
0.1.1.11-alpha. The effects of this bug became worse in
0.3.0.3-alpha, when we began treating missing descriptors from our
primary guards as a reason to delay circuits.
- Don't try fetching microdescriptors from relays that have failed
to deliver them in the past. Fixes bug 23817; bugfix
on 0.3.0.1-alpha.
o Minor bugfixes (compilation, backport from 0.3.2.7-rc):
- Fix a signed/unsigned comparison warning introduced by our fix to
TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
o Minor bugfixes (control port, linux seccomp2 sandbox, backport from 0.3.2.5-alpha):
- Avoid a crash when attempting to use the seccomp2 sandbox together
with the OwningControllerProcess feature. Fixes bug 24198; bugfix
on 0.2.5.1-alpha.
o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
- Fix a possible crash on malformed consensus. If a consensus had
contained an unparseable protocol line, it could have made clients
and relays crash with a null-pointer exception. To exploit this
issue, however, an attacker would need to be able to subvert the
directory authority system. Fixes bug 25251; bugfix on
0.2.9.4-alpha. Also tracked as TROVE-2018-004.
o Minor bugfixes (directory cache, backport from 0.3.2.5-alpha):
- Recover better from empty or corrupt files in the consensus cache
directory. Fixes bug 24099; bugfix on 0.3.1.1-alpha.
- When a consensus diff calculation is only partially successful,
only record the successful parts as having succeeded. Partial
success can happen if (for example) one compression method fails
but the others succeed. Previously we misrecorded all the
calculations as having succeeded, which would later cause a
nonfatal assertion failure. Fixes bug 24086; bugfix
on 0.3.1.1-alpha.
o Minor bugfixes (entry guards, backport from 0.3.2.3-alpha):
- Tor now updates its guard state when it reads a consensus
regardless of whether it's missing descriptors. That makes tor use
its primary guards to fetch descriptors in some edge cases where
it would previously have used fallback directories. Fixes bug
23862; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (logging, backport from 0.3.3.2-alpha):
- Don't treat inability to store a cached consensus object as a bug:
it can happen normally when we are out of disk space. Fixes bug
24859; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (memory usage, backport from 0.3.2.8-rc):
- When queuing DESTROY cells on a channel, only queue the circuit-id
and reason fields: not the entire 514-byte cell. This fix should
help mitigate any bugs or attacks that fill up these queues, and
free more RAM for other uses. Fixes bug 24666; bugfix
on 0.2.5.1-alpha.
o Minor bugfixes (network layer, backport from 0.3.2.5-alpha):
- When closing a connection via close_connection_immediately(), we
mark it as "not blocked on bandwidth", to prevent later calls from
trying to unblock it, and give it permission to read. This fixes a
backtrace warning that can happen on relays under various
circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
o Minor bugfixes (path selection, backport from 0.3.2.4-alpha):
- When selecting relays by bandwidth, avoid a rounding error that
could sometimes cause load to be imbalanced incorrectly.
Previously, we would always round upwards; now, we round towards
the nearest integer. This had the biggest effect when a relay's
weight adjustments should have given it weight 0, but it got
weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
- When calculating the fraction of nodes that have descriptors, and
all nodes in the network have zero bandwidths, count the number of
nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
- Actually log the total bandwidth in compute_weighted_bandwidths().
Fixes bug 24170; bugfix on 0.2.4.3-alpha.
o Minor bugfixes (performance, fragile-hardening, backport from 0.3.3.1-alpha):
- Improve the performance of our consensus-diff application code
when Tor is built with the --enable-fragile-hardening option set.
Fixes bug 24826; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (OSX, backport from 0.3.3.1-alpha):
- Don't exit the Tor process if setrlimit() fails to change the file
limit (which can happen sometimes on some versions of OSX). Fixes
bug 21074; bugfix on 0.0.9pre5.
o Minor bugfixes (portability, msvc, backport from 0.3.2.9):
- Fix a bug in the bit-counting parts of our timing-wheel code on
MSVC. (Note that MSVC is still not a supported build platform, due
to cyptographic timing channel risks.) Fixes bug 24633; bugfix
on 0.2.9.1-alpha.
o Minor bugfixes (relay, partial backport):
- Make the internal channel_is_client() function look at what sort
of connection handshake the other side used, rather than whether
the other side ever sent a create_fast cell to us. Backports part
of the fixes from bugs 22805 and 24898.
o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
- Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
0.2.9.4-alpha.
- Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
bugfix on 0.2.9.4-alpha.
o Code simplification and refactoring (backport from 0.3.3.3-alpha):
- Update the "rust dependencies" submodule to be a project-level
repository, rather than a user repository. Closes ticket 25323.
Changes in version 0.2.9.15 - 2018-03-03
Tor 0.2.9.15 backports important security and stability bugfixes from
later Tor releases.
It includes an important security fix for a remote crash attack
against directory authorities, tracked as TROVE-2018-001.
This release also backports our new system for improved resistance to
denial-of-service attacks against relays.
This release also fixes several minor bugs and annoyances from
earlier releases.
All directory authorities should upgrade to one of the versions
released today. Relays running 0.2.9.x may wish to update to one of
the versions released today, for the DoS mitigations.
o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
- Fix a protocol-list handling bug that could be used to remotely crash
directory authorities with a null-pointer exception. Fixes bug 25074;
bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
CVE-2018-0490.
o Major features (denial-of-service mitigation):
- Give relays some defenses against the recent network overload. We
start with three defenses (default parameters in parentheses).
First: if a single client address makes too many concurrent
connections (>100), hang up on further connections. Second: if a
single client address makes circuits too quickly (more than 3 per
second, with an allowed burst of 90) while also having too many
connections open (3), refuse new create cells for the next while
(1-2 hours). Third: if a client asks to establish a rendezvous
point to you directly, ignore the request. These defenses can be
manually controlled by new torrc options, but relays will also
take guidance from consensus parameters, so there's no need to
configure anything manually. Implements ticket 24902.
o Major bugfixes (bootstrapping):
- Fetch descriptors aggressively whenever we lack enough to build
circuits, regardless of how many descriptors we are missing.
Previously, we would delay launching the fetch when we had fewer
than 15 missing descriptors, even if some of those descriptors
were blocking circuits from building. Fixes bug 23985; bugfix on
0.1.1.11-alpha. The effects of this bug became worse in
0.3.0.3-alpha, when we began treating missing descriptors from our
primary guards as a reason to delay circuits.
o Major bugfixes (onion services, retry behavior):
- Fix an "off by 2" error in counting rendezvous failures on the
onion service side. While we thought we would stop the rendezvous
attempt after one failed circuit, we were actually making three
circuit attempts before giving up. Now switch to a default of 2,
and allow the consensus parameter "hs_service_max_rdv_failures" to
override. Fixes bug 24895; bugfix on 0.0.6.
o Minor feature (relay statistics):
- Change relay bandwidth reporting stats interval from 4 hours to 24
hours in order to reduce the efficiency of guard discovery
attacks. Fixes ticket 23856.
o Minor features (compatibility, OpenSSL):
- Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
Previous versions of Tor would not have worked with OpenSSL 1.1.1,
since they neither disabled TLS 1.3 nor enabled any of the
ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
Closes ticket 24978.
o Minor features (denial-of-service avoidance):
- Make our OOM handler aware of the geoip client history cache so it
doesn't fill up the memory. This check is important for IPv6 and
our DoS mitigation subsystem. Closes ticket 25122.
o Minor features (fallback directory mirrors):
- The fallback directory list has been re-generated based on the
current status of the network. Tor uses fallback directories to
bootstrap when it doesn't yet have up-to-date directory
information. Closes ticket 24801.
- Make the default DirAuthorityFallbackRate 0.1, so that clients
prefer to bootstrap from fallback directory mirrors. This is a
follow-up to 24679, which removed weights from the default
fallbacks. Implements ticket 24681.
o Minor features (geoip):
- Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
Country database.
o Minor features (linux seccomp2 sandbox):
- Update the sandbox rules so that they should now work correctly
with Glibc 2.26. Closes ticket 24315.
o Minor bugfix (channel connection):
- Use the actual observed address of an incoming relay connection,
not the canonical address of the relay from its descriptor, when
making decisions about how to handle the incoming connection.
Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
o Minor bugfix (directory authority):
- Directory authorities, when refusing a descriptor from a rejected
relay, now explicitly tell the relay (in its logs) to set a valid
ContactInfo address and contact the bad-relays@ mailing list.
Fixes bug 25170; bugfix on 0.2.9.1.
o Minor bugfixes (address selection):
- When the fascist_firewall_choose_address_ functions don't find a
reachable address, set the returned address to the null address
and port. This is a precautionary measure, because some callers do
not check the return value. Fixes bug 24736; bugfix
on 0.2.8.2-alpha.
o Minor bugfixes (compilation):
- Fix a signed/unsigned comparison warning introduced by our fix to
TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
o Minor bugfixes (control port, linux seccomp2 sandbox):
- Avoid a crash when attempting to use the seccomp2 sandbox together
with the OwningControllerProcess feature. Fixes bug 24198; bugfix
on 0.2.5.1-alpha.
o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
- Fix a possible crash on malformed consensus. If a consensus had
contained an unparseable protocol line, it could have made clients
and relays crash with a null-pointer exception. To exploit this
issue, however, an attacker would need to be able to subvert the
directory authority system. Fixes bug 25251; bugfix on
0.2.9.4-alpha. Also tracked as TROVE-2018-004.
o Minor bugfixes (memory usage):
- When queuing DESTROY cells on a channel, only queue the circuit-id
and reason fields: not the entire 514-byte cell. This fix should
help mitigate any bugs or attacks that fill up these queues, and
free more RAM for other uses. Fixes bug 24666; bugfix
on 0.2.5.1-alpha.
o Minor bugfixes (network layer):
- When closing a connection via close_connection_immediately(), we
mark it as "not blocked on bandwidth", to prevent later calls from
trying to unblock it, and give it permission to read. This fixes a
backtrace warning that can happen on relays under various
circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
o Minor bugfixes (OSX):
- Don't exit the Tor process if setrlimit() fails to change the file
limit (which can happen sometimes on some versions of OSX). Fixes
bug 21074; bugfix on 0.0.9pre5.
o Minor bugfixes (path selection):
- When selecting relays by bandwidth, avoid a rounding error that
could sometimes cause load to be imbalanced incorrectly.
Previously, we would always round upwards; now, we round towards
the nearest integer. This had the biggest effect when a relay's
weight adjustments should have given it weight 0, but it got
weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
- When calculating the fraction of nodes that have descriptors, and
all nodes in the network have zero bandwidths, count the number of
nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
- Actually log the total bandwidth in compute_weighted_bandwidths().
Fixes bug 24170; bugfix on 0.2.4.3-alpha.
o Minor bugfixes (portability, msvc):
- Fix a bug in the bit-counting parts of our timing-wheel code on
MSVC. (Note that MSVC is still not a supported build platform, due
to cryptographic timing channel risks.) Fixes bug 24633; bugfix
on 0.2.9.1-alpha.
o Minor bugfixes (relay):
- Make the internal channel_is_client() function look at what sort
of connection handshake the other side used, rather than whether
the other side ever sent a create_fast cell to us. Backports part
of the fixes from bugs 22805 and 24898.
o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
- Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
0.2.9.4-alpha.
- Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
bugfix on 0.2.9.4-alpha.
Changes in version 0.3.2.10 - 2018-03-03
Tor 0.3.2.10 is the second stable release in the 0.3.2 series. It
backports a number of bugfixes, including important fixes for security
issues.
It includes an important security fix for a remote crash attack
against directory authorities, tracked as TROVE-2018-001.
Additionally, it backports a fix for a bug whose severity we have
upgraded: Bug 24700, which was fixed in 0.3.3.2-alpha, can be remotely
triggered in order to crash relays with a use-after-free pattern. As
such, we are now tracking that bug as TROVE-2018-002 and
CVE-2018-0491, and backporting it to earlier releases. This bug
affected versions 0.3.2.1-alpha through 0.3.2.9, as well as version
0.3.3.1-alpha.
This release also backports our new system for improved resistance to
denial-of-service attacks against relays.
This release also fixes several minor bugs and annoyances from
earlier releases.
Relays running 0.3.2.x SHOULD upgrade to one of the versions released
today, for the fix to TROVE-2018-002. Directory authorities should
also upgrade. (Relays on earlier versions might want to update too for
the DoS mitigations.)
o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
- Fix a protocol-list handling bug that could be used to remotely crash
directory authorities with a null-pointer exception. Fixes bug 25074;
bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
CVE-2018-0490.
o Major bugfixes (scheduler, KIST, denial-of-service, backport from 0.3.3.2-alpha):
- Avoid adding the same channel twice in the KIST scheduler pending
list, which could lead to remote denial-of-service use-after-free
attacks against relays. Fixes bug 24700; bugfix on 0.3.2.1-alpha.
o Major features (denial-of-service mitigation, backport from 0.3.3.2-alpha):
- Give relays some defenses against the recent network overload. We
start with three defenses (default parameters in parentheses).
First: if a single client address makes too many concurrent
connections (>100), hang up on further connections. Second: if a
single client address makes circuits too quickly (more than 3 per
second, with an allowed burst of 90) while also having too many
connections open (3), refuse new create cells for the next while
(1-2 hours). Third: if a client asks to establish a rendezvous
point to you directly, ignore the request. These defenses can be
manually controlled by new torrc options, but relays will also
take guidance from consensus parameters, so there's no need to
configure anything manually. Implements ticket 24902.
o Major bugfixes (onion services, retry behavior, backport from 0.3.3.1-alpha):
- Fix an "off by 2" error in counting rendezvous failures on the
onion service side. While we thought we would stop the rendezvous
attempt after one failed circuit, we were actually making three
circuit attempts before giving up. Now switch to a default of 2,
and allow the consensus parameter "hs_service_max_rdv_failures" to
override. Fixes bug 24895; bugfix on 0.0.6.
- New-style (v3) onion services now obey the "max rendezvous circuit
attempts" logic. Previously they would make as many rendezvous
circuit attempts as they could fit in the MAX_REND_TIMEOUT second
window before giving up. Fixes bug 24894; bugfix on 0.3.2.1-alpha.
o Major bugfixes (protocol versions, backport from 0.3.3.2-alpha):
- Add Link protocol version 5 to the supported protocols list. Fixes
bug 25070; bugfix on 0.3.1.1-alpha.
o Major bugfixes (relay, backport from 0.3.3.1-alpha):
- Fix a set of false positives where relays would consider
connections to other relays as being client-only connections (and
thus e.g. deserving different link padding schemes) if those
relays fell out of the consensus briefly. Now we look only at the
initial handshake and whether the connection authenticated as a
relay. Fixes bug 24898; bugfix on 0.3.1.1-alpha.
o Major bugfixes (scheduler, consensus, backport from 0.3.3.2-alpha):
- The scheduler subsystem was failing to promptly notice changes in
consensus parameters, making it harder to switch schedulers
network-wide. Fixes bug 24975; bugfix on 0.3.2.1-alpha.
o Minor features (denial-of-service avoidance, backport from 0.3.3.2-alpha):
- Make our OOM handler aware of the geoip client history cache so it
doesn't fill up the memory. This check is important for IPv6 and
our DoS mitigation subsystem. Closes ticket 25122.
o Minor features (compatibility, OpenSSL, backport from 0.3.3.3-alpha):
- Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
Previous versions of Tor would not have worked with OpenSSL 1.1.1,
since they neither disabled TLS 1.3 nor enabled any of the
ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
Closes ticket 24978.
o Minor features (geoip):
- Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
Country database.
o Minor features (logging, diagnostic, backport from 0.3.3.2-alpha):
- When logging a failure to create an onion service's descriptor,
also log what the problem with the descriptor was. Diagnostic
for ticket 24972.
o Minor bugfix (channel connection, backport from 0.3.3.2-alpha):
- Use the actual observed address of an incoming relay connection,
not the canonical address of the relay from its descriptor, when
making decisions about how to handle the incoming connection.
Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
- Fix a possible crash on malformed consensus. If a consensus had
contained an unparseable protocol line, it could have made clients
and relays crash with a null-pointer exception. To exploit this
issue, however, an attacker would need to be able to subvert the
directory authority system. Fixes bug 25251; bugfix on
0.2.9.4-alpha. Also tracked as TROVE-2018-004.
o Minor bugfix (directory authority, backport from 0.3.3.2-alpha):
- Directory authorities, when refusing a descriptor from a rejected
relay, now explicitly tell the relay (in its logs) to set a valid
ContactInfo address and contact the bad-relays@ mailing list.
Fixes bug 25170; bugfix on 0.2.9.1.
o Minor bugfixes (build, rust, backport from 0.3.3.1-alpha):
- When building with Rust on OSX, link against libresolv, to work
around the issue at https://github.com/rust-lang/rust/issues/46797.
Fixes bug 24652; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (onion services, backport from 0.3.3.2-alpha):
- Remove a BUG() statement when a client fetches an onion descriptor
that has a lower revision counter than the one in its cache. This
can happen in normal circumstances due to HSDir desync. Fixes bug
24976; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (logging, backport from 0.3.3.2-alpha):
- Don't treat inability to store a cached consensus object as a bug:
it can happen normally when we are out of disk space. Fixes bug
24859; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (performance, fragile-hardening, backport from 0.3.3.1-alpha):
- Improve the performance of our consensus-diff application code
when Tor is built with the --enable-fragile-hardening option set.
Fixes bug 24826; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (OSX, backport from 0.3.3.1-alpha):
- Don't exit the Tor process if setrlimit() fails to change the file
limit (which can happen sometimes on some versions of OSX). Fixes
bug 21074; bugfix on 0.0.9pre5.
o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
- Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
0.2.9.4-alpha.
- Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
bugfix on 0.2.9.4-alpha.
o Minor bugfixes (testing, backport from 0.3.3.1-alpha):
- Fix a memory leak in the scheduler/loop_kist unit test. Fixes bug
25005; bugfix on 0.3.2.7-rc.
o Minor bugfixes (v3 onion services, backport from 0.3.3.2-alpha):
- Look at the "HSRend" protocol version, not the "HSDir" protocol
version, when deciding whether a consensus entry can support the
v3 onion service protocol as a rendezvous point. Fixes bug 25105;
bugfix on 0.3.2.1-alpha.
o Code simplification and refactoring (backport from 0.3.3.3-alpha):
- Update the "rust dependencies" submodule to be a project-level
repository, rather than a user repository. Closes ticket 25323.
o Documentation (backport from 0.3.3.1-alpha)
- Document that operators who run more than one relay or bridge are
expected to set MyFamily and ContactInfo correctly. Closes
ticket 24526.
Changes in version 0.3.3.3-alpha - 2018-03-03
Tor 0.3.3.3-alpha is the third alpha release for the 0.3.3.x series.
It includes an important security fix for a remote crash attack
against directory authorities tracked as TROVE-2018-001.
Additionally, with this release, we are upgrading the severity of a
bug fixed in 0.3.3.2-alpha. Bug 24700, which was fixed in
0.3.3.2-alpha, can be remotely triggered in order to crash relays with
a use-after-free pattern. As such, we are now tracking that bug as
TROVE-2018-002 and CVE-2018-0491. This bug affected versions
0.3.2.1-alpha through 0.3.2.9, as well as 0.3.3.1-alpha.
This release also fixes several minor bugs and annoyances from
earlier releases.
Relays running 0.3.2.x should upgrade to one of the versions released
today, for the fix to TROVE-2018-002. Directory authorities should
also upgrade. (Relays on earlier versions might want to update too for
the DoS mitigations.)
o Major bugfixes (denial-of-service, directory authority):
- Fix a protocol-list handling bug that could be used to remotely crash
directory authorities with a null-pointer exception. Fixes bug 25074;
bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
CVE-2018-0490.
o Minor features (compatibility, OpenSSL):
- Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
Previous versions of Tor would not have worked with OpenSSL 1.1.1,
since they neither disabled TLS 1.3 nor enabled any of the
ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
Closes ticket 24978.
o Minor features (logging):
- Clarify the log messages produced when getrandom() or a related
entropy-generation mechanism gives an error. Closes ticket 25120.
o Minor features (testing):
- Add a "make test-rust" target to run the rust tests only. Closes
ticket 25071.
o Minor bugfixes (denial-of-service):
- Fix a possible crash on malformed consensus. If a consensus had
contained an unparseable protocol line, it could have made clients
and relays crash with a null-pointer exception. To exploit this
issue, however, an attacker would need to be able to subvert the
directory authority system. Fixes bug 25251; bugfix on
0.2.9.4-alpha. Also tracked as TROVE-2018-004.
o Minor bugfixes (DoS mitigation):
- Add extra safety checks when refilling the circuit creation bucket
to ensure we never set a value above the allowed maximum burst.
Fixes bug 25202; bugfix on 0.3.3.2-alpha.
- When a new consensus arrives, don't update our DoS-mitigation
parameters if we aren't a public relay. Fixes bug 25223; bugfix
on 0.3.3.2-alpha.
o Minor bugfixes (man page, SocksPort):
- Remove dead code from the old "SocksSocket" option, and rename
SocksSocketsGroupWritable to UnixSocksGroupWritable. The old option
still works, but is deprecated. Fixes bug 24343; bugfix on 0.2.6.3.
o Minor bugfixes (performance):
- Reduce the number of circuits that will be opened at once during
the circuit build timeout phase. This is done by increasing the
idle timeout to 3 minutes, and lowering the maximum number of
concurrent learning circuits to 10. Fixes bug 24769; bugfix
on 0.3.1.1-alpha.
o Minor bugfixes (spec conformance):
- Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
0.2.9.4-alpha.
- Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
bugfix on 0.2.9.4-alpha.
o Minor bugfixes (spec conformance, rust):
- Resolve a denial-of-service issue caused by an infinite loop in
the rust protover code. Fixes bug 25250, bugfix on 0.3.3.1-alpha.
Also tracked as TROVE-2018-003.
o Code simplification and refactoring:
- Update the "rust dependencies" submodule to be a project-level
repository, rather than a user repository. Closes ticket 25323.
Changes in version 0.3.3.2-alpha - 2018-02-10
Tor 0.3.3.2-alpha is the second alpha in the 0.3.3.x series. It
introduces a mechanism to handle the high loads that many relay
operators have been reporting recently. It also fixes several bugs in
older releases. If this new code proves reliable, we plan to backport
it to older supported release series.
o Major features (denial-of-service mitigation):
- Give relays some defenses against the recent network overload. We
start with three defenses (default parameters in parentheses).
First: if a single client address makes too many concurrent
connections (>100), hang up on further connections. Second: if a
single client address makes circuits too quickly (more than 3 per
second, with an allowed burst of 90) while also having too many
connections open (3), refuse new create cells for the next while
(1-2 hours). Third: if a client asks to establish a rendezvous
point to you directly, ignore the request. These defenses can be
manually controlled by new torrc options, but relays will also
take guidance from consensus parameters, so there's no need to
configure anything manually. Implements ticket 24902.
o Major bugfixes (netflow padding):
- Stop adding unneeded channel padding right after we finish
flushing to a connection that has been trying to flush for many
seconds. Instead, treat all partial or complete flushes as
activity on the channel, which will defer the time until we need
to add padding. This fix should resolve confusing and scary log
messages like "Channel padding timeout scheduled 221453ms in the
past." Fixes bug 22212; bugfix on 0.3.1.1-alpha.
o Major bugfixes (protocol versions):
- Add Link protocol version 5 to the supported protocols list. Fixes
bug 25070; bugfix on 0.3.1.1-alpha.
o Major bugfixes (scheduler, consensus):
- The scheduler subsystem was failing to promptly notice changes in
consensus parameters, making it harder to switch schedulers
network-wide. Fixes bug 24975; bugfix on 0.3.2.1-alpha.
o Minor features (denial-of-service avoidance):
- Make our OOM handler aware of the geoip client history cache so it
doesn't fill up the memory. This check is important for IPv6 and
our DoS mitigation subsystem. Closes ticket 25122.
o Minor features (directory authority):
- When directory authorities are unable to add signatures to a
pending consensus, log the reason why. Closes ticket 24849.
o Minor features (geoip):
- Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
Country database.
o Minor features (logging, diagnostic):
- When logging a failure to create an onion service's descriptor,
also log what the problem with the descriptor was. Diagnostic for
ticket 24972.
o Minor bugfix (channel connection):
- Use the actual observed address of an incoming relay connection,
not the canonical address of the relay from its descriptor, when
making decisions about how to handle the incoming connection.
Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
o Minor bugfix (directory authority):
- Directory authorities, when refusing a descriptor from a rejected
relay, now explicitly tell the relay (in its logs) to set a valid
ContactInfo address and contact the bad-relays@ mailing list.
Fixes bug 25170; bugfix on 0.2.9.1.
o Minor bugfixes (all versions of Tor):
- Use the "misspell" tool to detect and fix typos throughout the
source code. Fixes bug 23650; bugfix on various versions of Tor.
Patch from Deepesh Pathak.
o Minor bugfixes (circuit, cannibalization):
- Don't cannibalize preemptively-built circuits if we no longer
recognize their first hop. This situation can happen if our Guard
relay went off the consensus after the circuit was created. Fixes
bug 24469; bugfix on 0.0.6.
o Minor bugfixes (correctness):
- Remove a nonworking, unnecessary check to see whether a circuit
hop's identity digest was set when the circuit failed. Fixes bug
24927; bugfix on 0.2.4.4-alpha.
o Minor bugfixes (logging):
- Don't treat inability to store a cached consensus object as a bug:
it can happen normally when we are out of disk space. Fixes bug
24859; bugfix on 0.3.1.1-alpha.
- Fix a (mostly harmless) race condition when invoking
LOG_PROTOCOL_WARN message from a subthread while the torrc options
are changing. Fixes bug 23954; bugfix on 0.1.1.9-alpha.
o Minor bugfixes (onion services):
- Remove a BUG() statement when a client fetches an onion descriptor
that has a lower revision counter than the one in its cache. This
can happen in normal circumstances due to HSDir desync. Fixes bug
24976; bugfix on 0.3.2.1-alpha.
- If we are configured to offer a single onion service, don't log
long-term established one hop rendezvous points in the heartbeat.
Fixes bug 25116; bugfix on 0.2.9.6-rc.
o Minor bugfixes (performance):
- Avoid calling protocol_list_supports_protocol() from inside tight
loops when running with cached routerinfo_t objects. Instead,
summarize the relevant protocols as flags in the routerinfo_t, as
we do for routerstatus_t objects. This change simplifies our code
a little, and saves a large amount of short-term memory allocation
operations. Fixes bug 25008; bugfix on 0.2.9.4-alpha.
o Minor bugfixes (Rust FFI):
- Fix a minor memory leak which would happen whenever the C code
would call the Rust implementation of
protover_get_supported_protocols(). This was due to the C version
returning a static string, whereas the Rust version newly allocated
a CString to pass across the FFI boundary. Consequently, the C
code was not expecting to need to free() what it was given. Fixes
bug 25127; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (scheduler, KIST):
- Avoid adding the same channel twice in the KIST scheduler pending
list, which would waste CPU cycles. Fixes bug 24700; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (unit test, monotonic time):
- Increase a constant (1msec to 10msec) in the monotonic time test
that makes sure the nsec/usec/msec times read are synchronized.
This change was needed to accommodate slow systems like armel or
when the clock_gettime() is not a VDSO on the running kernel.
Fixes bug 25113; bugfix on 0.2.9.1.
o Minor bugfixes (v3 onion services):
- Look at the "HSRend" protocol version, not the "HSDir" protocol
version, when deciding whether a consensus entry can support the
v3 onion service protocol as a rendezvous point. Fixes bug 25105;
bugfix on 0.3.2.1-alpha.
o Code simplification and refactoring:
- Remove the unused nodelist_recompute_all_hsdir_indices(). Closes
ticket 25108.
- Remove a series of counters used to track circuit extend attempts
and connection status but that in reality we aren't using for
anything other than stats logged by a SIGUSR1 signal. Closes
ticket 25163.
o Documentation (man page):
- The HiddenServiceVersion torrc option accepts only one number:
either version 2 or 3. Closes ticket 25026; bugfix
on 0.3.2.2-alpha.
Changes in version 0.3.3.1-alpha - 2018-01-25
Tor 0.3.3.1-alpha is the first release in the 0.3.3.x series. It adds
several new features to Tor, including several improvements to
bootstrapping, and support for an experimental "vanguards" feature to
resist guard discovery attacks. This series also includes better
support for applications that need to embed Tor or manage v3
onion services.
o Major features (embedding):
- There is now a documented stable API for programs that need to
embed Tor. See tor_api.h for full documentation and known bugs.
Closes ticket 23684.
- Tor now has support for restarting in the same process.
Controllers that run Tor using the "tor_api.h" interface can now
restart Tor after Tor has exited. This support is incomplete,
however: we fixed crash bugs that prevented it from working at
all, but many bugs probably remain, including a possibility of
security issues. Implements ticket 24581.
o Major features (IPv6, directory documents):
- Add consensus method 27, which adds IPv6 ORPorts to the microdesc
consensus. This information makes it easier for IPv6 clients to
bootstrap and choose reachable entry guards. Implements ticket 23826.
- Add consensus method 28, which removes IPv6 ORPorts from
microdescriptors. Now that the consensus contains IPv6 ORPorts, they
are redundant in microdescs. This change will be used by Tor clients
on 0.2.8.x and later. (That is to say, with all Tor clients that
have IPv6 bootstrap and guard support.) Implements ticket 23828.
- Expand the documentation for AuthDirHasIPv6Connectivity when it is
set by different numbers of authorities. Fixes 23870
on 0.2.4.1-alpha.
o Major features (onion service v3, control port):
- The control port now supports commands and events for v3 onion
services. It is now possible to create ephemeral v3 services using
ADD_ONION. Additionally, several events (HS_DESC, HS_DESC_CONTENT,
CIRC and CIRC_MINOR) and commands (GETINFO, HSPOST, ADD_ONION and
DEL_ONION) have been extended to support v3 onion services. Closes
ticket 20699; implements proposal 284.
o Major features (onion services):
- Provide torrc options to pin the second and third hops of onion
service circuits to a list of nodes. The option HSLayer2Guards
pins the second hop, and the option HSLayer3Guards pins the third
hop. These options are for use in conjunction with experiments
with "vanguards" for preventing guard enumeration attacks. Closes
ticket 13837.
o Major features (rust, portability, experimental):
- Tor now ships with an optional implementation of one of its
smaller modules (protover.c) in the Rust programming language. To
try it out, install a Rust build environment, and configure Tor
with "--enable-rust --enable-cargo-online-mode". This should not
cause any user-visible changes, but should help us gain more
experience with Rust, and plan future Rust integration work.
Implementation by Chelsea Komlo. Closes ticket 22840.
o Minor features (storage, configuration):
- Users can store cached directory documents somewhere other than
the DataDirectory by using the CacheDirectory option. Similarly,
the storage location for relay's keys can be overridden with the
KeyDirectory option. Closes ticket 22703.
o Major features (v3 onion services, ipv6):
- When v3 onion service clients send introduce cells, they now
include the IPv6 address of the rendezvous point, if it has one.
Current v3 onion services running 0.3.2 ignore IPv6 addresses, but
in future Tor versions, IPv6-only v3 single onion services will be
able to use IPv6 addresses to connect directly to the rendezvous
point. Closes ticket 23577. Patch by Neel Chauhan.
o Major bugfixes (onion services, retry behavior):
- Fix an "off by 2" error in counting rendezvous failures on the
onion service side. While we thought we would stop the rendezvous
attempt after one failed circuit, we were actually making three
circuit attempts before giving up. Now switch to a default of 2,
and allow the consensus parameter "hs_service_max_rdv_failures" to
override. Fixes bug 24895; bugfix on 0.0.6.
- New-style (v3) onion services now obey the "max rendezvous circuit
attempts" logic. Previously they would make as many rendezvous
circuit attempts as they could fit in the MAX_REND_TIMEOUT second
window before giving up. Fixes bug 24894; bugfix on 0.3.2.1-alpha.
o Major bugfixes (relays):
- Fix a set of false positives where relays would consider
connections to other relays as being client-only connections (and
thus e.g. deserving different link padding schemes) if those
relays fell out of the consensus briefly. Now we look only at the
initial handshake and whether the connection authenticated as a
relay. Fixes bug 24898; bugfix on 0.3.1.1-alpha.
o Minor feature (IPv6):
- Make IPv6-only clients wait for microdescs for relays, even if we
were previously using descriptors (or were using them as a bridge)
and have a cached descriptor for them. Implements ticket 23827.
- When a consensus has IPv6 ORPorts, make IPv6-only clients use
them, rather than waiting to download microdescriptors.
Implements ticket 23827.
o Minor features (cleanup):
- Tor now deletes the CookieAuthFile and ExtORPortCookieAuthFile
when it stops. Closes ticket 23271.
o Minor features (defensive programming):
- Most of the functions in Tor that free objects have been replaced
with macros that free the objects and set the corresponding
pointers to NULL. This change should help prevent a large class of
dangling pointer bugs. Closes ticket 24337.
- Where possible, the tor_free() macro now only evaluates its input
once. Part of ticket 24337.
- Check that microdesc ed25519 ids are non-zero in
node_get_ed25519_id() before returning them. Implements ticket
24001, patch by "aruna1234".
o Minor features (embedding):
- Tor can now start with a preauthenticated control connection
created by the process that launched it. This feature is meant for
use by programs that want to launch and manage a Tor process
without allowing other programs to manage it as well. For more
information, see the __OwningControllerFD option documented in
control-spec.txt. Closes ticket 23900.
- On most errors that would cause Tor to exit, it now tries to
return from the tor_main() function, rather than calling the
system exit() function. Most users won't notice a difference here,
but it should be significant for programs that run Tor inside
a separate thread: they should now be able to survive Tor's exit
conditions rather than having Tor shut down the entire process.
Closes ticket 23848.
- Applications that want to embed Tor can now tell Tor not to
register any of its own POSIX signal handlers, using the
__DisableSignalHandlers option. Closes ticket 24588.
o Minor features (fallback directory list):
- Avoid selecting fallbacks that change their IP addresses too
often. Select more fallbacks by ignoring the Guard flag, and
allowing lower cutoffs for the Running and V2Dir flags. Also allow
a lower bandwidth, and a higher number of fallbacks per operator
(5% of the list). Implements ticket 24785.
- Update the fallback whitelist and blacklist based on opt-ins and
relay changes. Closes tickets 22321, 24678, 22527, 24135,
and 24695.
o Minor features (fallback directory mirror configuration):
- Add a nickname to each fallback in a C comment. This makes it
easier for operators to find their relays, and allows stem to use
nicknames to identify fallbacks. Implements ticket 24600.
- Add a type and version header to the fallback directory mirror
file. Also add a delimiter to the end of each fallback entry. This
helps external parsers like stem and Relay Search. Implements
ticket 24725.
- Add an extrainfo cache flag for each fallback in a C comment. This
allows stem to use fallbacks to fetch extra-info documents, rather
than using authorities. Implements ticket 22759.
- Add the generateFallbackDirLine.py script for automatically
generating fallback directory mirror lines from relay fingerprints.
No more typos! Add the lookupFallbackDirContact.py script for
automatically looking up operator contact info from relay
fingerprints. Implements ticket 24706, patch by teor and atagar.
- Reject any fallback directory mirror that serves an expired
consensus. Implements ticket 20942, patch by "minik".
- Remove commas and equals signs from external string inputs to the
fallback list. This avoids format confusion attacks. Implements
ticket 24726.
- Remove the "weight=10" line from fallback directory mirror
entries. Ticket 24681 will maintain the current fallback weights
by changing Tor's default fallback weight to 10. Implements
ticket 24679.
- Stop logging excessive information about fallback netblocks.
Implements ticket 24791.
o Minor features (forward-compatibility):
- If a relay supports some link authentication protocol that we do
not recognize, then include that relay's ed25519 key when telling
other relays to extend to it. Previously, we treated future
versions as if they were too old to support ed25519 link
authentication. Closes ticket 20895.
o Minor features (heartbeat):
- Add onion service information to our heartbeat logs, displaying
stats about the activity of configured onion services. Closes
ticket 24896.
o Minor features (instrumentation, development):
- Add the MainloopStats option to allow developers to get
instrumentation information from the main event loop via the
heartbeat messages. We hope to use this to improve Tor's behavior
when it's trying to sleep. Closes ticket 24605.
o Minor features (log messages):
- Improve a warning message that happens when we fail to re-parse an
old router because of an expired certificate. Closes ticket 20020.
- Make the log more quantitative when we hit MaxMemInQueues
threshold exposing some values. Closes ticket 24501.
o Minor features (logging, android):
- Added support for the Android logging subsystem. Closes
ticket 24362.
o Minor features (performance):
- Support predictive circuit building for onion service circuits
with multiple layers of guards. Closes ticket 23101.
- Use stdatomic.h where available, rather than mutexes, to implement
atomic_counter_t. Closes ticket 23953.
o Minor features (performance, 32-bit):
- Improve performance on 32-bit systems by avoiding 64-bit division
when calculating the timestamp in milliseconds for channel padding
computations. Implements ticket 24613.
- Improve performance on 32-bit systems by avoiding 64-bit division
when timestamping cells and buffer chunks for OOM calculations.
Implements ticket 24374.
o Minor features (performance, OSX, iOS):
- Use the mach_approximate_time() function (when available) to
implement coarse monotonic time. Having a coarse time function
should avoid a large number of system calls, and improve
performance slightly, especially under load. Closes ticket 24427.
o Minor features (performance, windows):
- Improve performance on Windows Vista and Windows 7 by adjusting
TCP send window size according to the recommendation from
SIO_IDEAL_SEND_BACKLOG_QUERY. Closes ticket 22798. Patch
from Vort.
o Major features (relay):
- Implement an option, ReducedExitPolicy, to allow an Tor exit relay
operator to use a more reasonable ("reduced") exit policy, rather
than the default one. If you want to run an exit node without
thinking too hard about which ports to allow, this one is for you.
Closes ticket 13605. Patch from Neel Chauhan.
o Minor features (testing, debugging, embedding):
- For development purposes, Tor now has a mode in which it runs for
a few seconds, then stops, and starts again without exiting the
process. This mode is meant to help us debug various issues with
ticket 23847. To use this feature, compile with
--enable-restart-debugging, and set the TOR_DEBUG_RESTART
environment variable. This is expected to crash a lot, and is
really meant for developers only. It will likely be removed in a
future release. Implements ticket 24583.
o Minor bugfix (network IPv6 test):
- Tor's test scripts now check if "ping -6 ::1" works when the user
runs "make test-network-all". Fixes bug 24677; bugfix on
0.2.9.3-alpha. Patch by "ffmancera".
o Minor bugfixes (build, rust):
- Fix output of autoconf checks to display success messages for Rust
dependencies and a suitable rustc compiler version. Fixes bug
24612; bugfix on 0.3.1.3-alpha.
- When building with Rust on OSX, link against libresolv, to work
around the issue at https://github.com/rust-lang/rust/issues/46797.
Fixes bug 24652; bugfix on 0.3.1.1-alpha.
- Don't pass the --quiet option to cargo: it seems to suppress some
errors, which is not what we want to do when building. Fixes bug
24518; bugfix on 0.3.1.7.
- Build correctly when building from outside Tor's source tree with
the TOR_RUST_DEPENDENCIES option set. Fixes bug 22768; bugfix
on 0.3.1.7.
o Minor bugfixes (directory authorities, IPv6):
- When creating a routerstatus (vote) from a routerinfo (descriptor),
set the IPv6 address to the unspecified IPv6 address, and
explicitly initialize the port to zero. Fixes bug 24488; bugfix
on 0.2.4.1-alpha.
o Minor bugfixes (fallback directory mirrors):
- Make updateFallbackDirs.py search harder for python. (Some OSs
don't put it in /usr/bin.) Fixes bug 24708; bugfix
on 0.2.8.1-alpha.
o Minor bugfixes (hibernation, bandwidth accounting, shutdown):
- When hibernating, close connections normally and allow them to
flush. Fixes bug 23571; bugfix on 0.2.4.7-alpha. Also fixes
bug 7267.
- Do not attempt to launch self-reachability tests when entering
hibernation. Fixes a case of bug 12062; bugfix on 0.0.9pre5.
- Resolve several bugs related to descriptor fetching on bridge
clients with bandwidth accounting enabled. (This combination is
not recommended!) Fixes a case of bug 12062; bugfix
on 0.2.0.3-alpha.
- When hibernating, do not attempt to launch DNS checks. Fixes a
case of bug 12062; bugfix on 0.1.2.2-alpha.
- When hibernating, do not try to upload or download descriptors.
Fixes a case of bug 12062; bugfix on 0.0.9pre5.
o Minor bugfixes (IPv6, bridges):
- Tor now always sets IPv6 preferences for bridges. Fixes bug 24573;
bugfix on 0.2.8.2-alpha.
- Tor now sets IPv6 address in the routerstatus as well as in the
router descriptors when updating addresses for a bridge. Closes
ticket 24572; bugfix on 0.2.4.5-alpha. Patch by "ffmancera".
o Minor bugfixes (linux seccomp2 sandbox):
- When running with the sandbox enabled, reload configuration files
correctly even when %include was used. Previously we would crash.
Fixes bug 22605; bugfix on 0.3.1. Patch from Daniel Pinto.
o Minor bugfixes (memory leaks):
- Avoid possible at-exit memory leaks related to use of Libevent's
event_base_once() function. (This function tends to leak memory if
the event_base is closed before the event fires.) Fixes bug 24584;
bugfix on 0.2.8.1-alpha.
- Fix a harmless memory leak in tor-resolve. Fixes bug 24582; bugfix
on 0.2.1.1-alpha.
o Minor bugfixes (OSX):
- Don't exit the Tor process if setrlimit() fails to change the file
limit (which can happen sometimes on some versions of OSX). Fixes
bug 21074; bugfix on 0.0.9pre5.
o Minor bugfixes (performance, fragile-hardening):
- Improve the performance of our consensus-diff application code
when Tor is built with the --enable-fragile-hardening option set.
Fixes bug 24826; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (performance, timeouts):
- Consider circuits for timeout as soon as they complete a hop. This
is more accurate than applying the timeout in
circuit_expire_building() because that function is only called
once per second, which is now too slow for typical timeouts on the
current network. Fixes bug 23114; bugfix on 0.2.2.2-alpha.
- Use onion service circuits (and other circuits longer than 3 hops)
to calculate a circuit build timeout. Previously, Tor only
calculated its build timeout based on circuits that planned to be
exactly 3 hops long. With this change, we include measurements
from all circuits at the point where they complete their third
hop. Fixes bug 23100; bugfix on 0.2.2.2-alpha.
o Minor bugfixes (testing):
- Give out Exit flags in bootstrapping networks. Fixes bug 24137;
bugfix on 0.2.3.1-alpha.
- Fix a memory leak in the scheduler/loop_kist unit test. Fixes bug
25005; bugfix on 0.3.2.7-rc.
o Code simplification and refactoring:
- Remove /usr/athena from search path in configure.ac. Closes
ticket 24363.
- Remove duplicate code in node_has_curve25519_onion_key() and
node_get_curve25519_onion_key(), and add a check for a zero
microdesc curve25519 onion key. Closes ticket 23966, patch by
"aruna1234" and teor.
- Rewrite channel_rsa_id_group_set_badness to reduce temporary
memory allocations with large numbers of OR connections (e.g.
relays). Closes ticket 24119.
- Separate the function that deletes ephemeral files when Tor
stops gracefully.
- Small changes to Tor's buf_t API to make it suitable for use as a
general-purpose safe string constructor. Closes ticket 22342.
- Switch -Wnormalized=id to -Wnormalized=nfkc in configure.ac to
avoid source code identifier confusion. Closes ticket 24467.
- The tor_git_revision[] constant no longer needs to be redeclared
by everything that links against the rest of Tor. Done as part of
ticket 23845, to simplify our external API.
- We make extend_info_from_node() use node_get_curve25519_onion_key()
introduced in ticket 23577 to access the curve25519 public keys
rather than accessing it directly. Closes ticket 23760. Patch by
Neel Chauhan.
- Add a function to log channels' scheduler state changes to aid
debugging efforts. Closes ticket 24531.
o Documentation:
- Add documentation on how to build tor with Rust dependencies
without having to be online. Closes ticket 22907; bugfix
on 0.3.0.3-alpha.
- Clarify the behavior of RelayBandwidth{Rate,Burst} with client
traffic. Closes ticket 24318.
- Document that OutboundBindAddress doesn't apply to DNS requests.
Closes ticket 22145. Patch from Aruna Maurya.
- Document that operators who run more than one relay or bridge are
expected to set MyFamily and ContactInfo correctly. Closes
ticket 24526.
o Code simplification and refactoring (channels):
- Remove the incoming and outgoing channel queues. These were never
used, but still took up a step in our fast path.
- The majority of the channel unit tests have been rewritten and the
code coverage has now been raised to 83.6% for channel.c. Closes
ticket 23709.
- Remove other dead code from the channel subsystem: All together,
this cleanup has removed more than 1500 lines of code overall and
adding very little except for unit test.
o Code simplification and refactoring (circuit rendezvous):
- Split the client-side rendezvous circuit lookup into two
functions: one that returns only established circuits and another
that returns all kinds of circuits. Closes ticket 23459.
o Code simplification and refactoring (controller):
- Make most of the variables in networkstatus_getinfo_by_purpose()
const. Implements ticket 24489.
Changes in version 0.3.2.9 - 2018-01-09
Tor 0.3.2.9 is the first stable release in the 0.3.2 series.
The 0.3.2 series includes our long-anticipated new onion service
design, with numerous security features. (For more information, see
our blog post at https://blog.torproject.org/fall-harvest.) We also
have a new circuit scheduler algorithm for improved performance on
relays everywhere (see https://blog.torproject.org/kist-and-tell),
along with many smaller features and bugfixes.
Per our stable release policy, we plan to support each stable release
series for at least the next nine months, or for three months after
the first stable release of the next series: whichever is longer. If
you need a release with long-term support, we recommend that you stay
with the 0.2.9 series.
Below is a list of the changes since 0.3.2.8-rc. For a list of all
changes since 0.3.1, see the ReleaseNotes file.
o Minor features (fallback directory mirrors):
- The fallback directory list has been re-generated based on the
current status of the network. Tor uses fallback directories to
bootstrap when it doesn't yet have up-to-date directory
information. Closes ticket 24801.
- Make the default DirAuthorityFallbackRate 0.1, so that clients
prefer to bootstrap from fallback directory mirrors. This is a
follow-up to 24679, which removed weights from the default
fallbacks. Implements ticket 24681.
o Minor features (geoip):
- Update geoip and geoip6 to the January 5 2018 Maxmind GeoLite2
Country database.
o Minor bugfixes (address selection):
- When the fascist_firewall_choose_address_ functions don't find a
reachable address, set the returned address to the null address
and port. This is a precautionary measure, because some callers do
not check the return value. Fixes bug 24736; bugfix
on 0.2.8.2-alpha.
o Minor bugfixes (compilation):
- Resolve a few shadowed-variable warnings in the onion service
code. Fixes bug 24634; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (portability, msvc):
- Fix a bug in the bit-counting parts of our timing-wheel code on
MSVC. (Note that MSVC is still not a supported build platform, due
to cryptographic timing channel risks.) Fixes bug 24633; bugfix
on 0.2.9.1-alpha.
Changes in version 0.3.2.8-rc - 2017-12-21
Tor 0.3.2.8-rc fixes a pair of bugs in the KIST and KISTLite
schedulers that had led servers under heavy load to overload their
outgoing connections. All relay operators running earlier 0.3.2.x
versions should upgrade. This version also includes a mitigation for
over-full DESTROY queues leading to out-of-memory conditions: if it
works, we will soon backport it to earlier release series.
This is the second release candidate in the 0.3.2 series. If we find
no new bugs or regression here, then the first stable 0.3.2 release
will be nearly identical to this.
o Major bugfixes (KIST, scheduler):
- The KIST scheduler did not correctly account for data already
enqueued in each connection's send socket buffer, particularly in
cases when the TCP/IP congestion window was reduced between
scheduler calls. This situation lead to excessive per-connection
buffering in the kernel, and a potential memory DoS. Fixes bug
24665; bugfix on 0.3.2.1-alpha.
o Minor features (geoip):
- Update geoip and geoip6 to the December 6 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (hidden service v3):
- Bump hsdir_spread_store parameter from 3 to 4 in order to increase
the probability of reaching a service for a client missing
microdescriptors. Fixes bug 24425; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (memory usage):
- When queuing DESTROY cells on a channel, only queue the circuit-id
and reason fields: not the entire 514-byte cell. This fix should
help mitigate any bugs or attacks that fill up these queues, and
free more RAM for other uses. Fixes bug 24666; bugfix
on 0.2.5.1-alpha.
o Minor bugfixes (scheduler, KIST):
- Use a sane write limit for KISTLite when writing onto a connection
buffer instead of using INT_MAX and shoving as much as it can.
Because the OOM handler cleans up circuit queues, we are better
off at keeping them in that queue instead of the connection's
buffer. Fixes bug 24671; bugfix on 0.3.2.1-alpha.
Changes in version 0.3.2.7-rc - 2017-12-14
Tor 0.3.2.7-rc fixes various bugs in earlier versions of Tor,
including some that could affect reliability or correctness.
This is the first release candidate in the 0.3.2 series. If we find no
new bugs or regression here, then the first stable 0.3.2. release will
be nearly identical to this.
o Major bugfixes (circuit prediction):
- Fix circuit prediction logic so that a client doesn't treat a port
as being "handled" by a circuit if that circuit already has
isolation settings on it. This change should make Tor clients more
responsive by improving their chances of having a pre-created
circuit ready for use when a request arrives. Fixes bug 18859;
bugfix on 0.2.3.3-alpha.
o Minor features (logging):
- Provide better warnings when the getrandom() syscall fails. Closes
ticket 24500.
o Minor features (portability):
- Tor now compiles correctly on arm64 with libseccomp-dev installed.
(It doesn't yet work with the sandbox enabled.) Closes
ticket 24424.
o Minor bugfixes (bridge clients, bootstrap):
- Retry directory downloads when we get our first bridge descriptor
during bootstrap or while reconnecting to the network. Keep
retrying every time we get a bridge descriptor, until we have a
reachable bridge. Fixes part of bug 24367; bugfix on 0.2.0.3-alpha.
- Stop delaying bridge descriptor fetches when we have cached bridge
descriptors. Instead, only delay bridge descriptor fetches when we
have at least one reachable bridge. Fixes part of bug 24367;
bugfix on 0.2.0.3-alpha.
- Stop delaying directory fetches when we have cached bridge
descriptors. Instead, only delay bridge descriptor fetches when
all our bridges are definitely unreachable. Fixes part of bug
24367; bugfix on 0.2.0.3-alpha.
o Minor bugfixes (compilation):
- Fix a signed/unsigned comparison warning introduced by our fix to
TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
o Minor bugfixes (correctness):
- Fix several places in our codebase where a C compiler would be
likely to eliminate a check, based on assuming that undefined
behavior had not happened elsewhere in the code. These cases are
usually a sign of redundant checking or dubious arithmetic. Found
by Georg Koppen using the "STACK" tool from Wang, Zeldovich,
Kaashoek, and Solar-Lezama. Fixes bug 24423; bugfix on various
Tor versions.
o Minor bugfixes (onion service v3):
- Fix a race where an onion service would launch a new intro circuit
after closing an old one, but fail to register it before freeing
the previously closed circuit. This bug was making the service
unable to find the established intro circuit and thus not upload
its descriptor, thus making a service unavailable for up to 24
hours. Fixes bug 23603; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (scheduler, KIST):
- Properly set the scheduler state of an unopened channel in the
KIST scheduler main loop. This prevents a harmless but annoying
log warning. Fixes bug 24502; bugfix on 0.3.2.4-alpha.
- Avoid a possible integer overflow when computing the available
space on the TCP buffer of a channel. This had no security
implications; but could make KIST allow too many cells on a
saturated connection. Fixes bug 24590; bugfix on 0.3.2.1-alpha.
- Downgrade to "info" a harmless warning about the monotonic time
moving backwards: This can happen on platform not supporting
monotonic time. Fixes bug 23696; bugfix on 0.3.2.1-alpha.
Changes in version 0.3.2.6-alpha - 2017-12-01
This version of Tor is the latest in the 0.3.2 alpha series. It
includes fixes for several important security issues. All Tor users
should upgrade to this release, or to one of the other releases coming
out today.
o Major bugfixes (security):
- Fix a denial of service bug where an attacker could use a
malformed directory object to cause a Tor instance to pause while
OpenSSL would try to read a passphrase from the terminal. (Tor
instances run without a terminal, which is the case for most Tor
packages, are not impacted.) Fixes bug 24246; bugfix on every
version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
Found by OSS-Fuzz as testcase 6360145429790720.
- Fix a denial of service issue where an attacker could crash a
directory authority using a malformed router descriptor. Fixes bug
24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
and CVE-2017-8820.
- When checking for replays in the INTRODUCE1 cell data for a
(legacy) onion service, correctly detect replays in the RSA-
encrypted part of the cell. We were previously checking for
replays on the entire cell, but those can be circumvented due to
the malleability of Tor's legacy hybrid encryption. This fix helps
prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
and CVE-2017-8819.
o Major bugfixes (security, onion service v2):
- Fix a use-after-free error that could crash v2 Tor onion services
when they failed to open circuits while expiring introduction
points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
also tracked as TROVE-2017-013 and CVE-2017-8823.
o Major bugfixes (security, relay):
- When running as a relay, make sure that we never build a path
through ourselves, even in the case where we have somehow lost the
version of our descriptor appearing in the consensus. Fixes part
of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
as TROVE-2017-012 and CVE-2017-8822.
- When running as a relay, make sure that we never choose ourselves
as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
o Minor feature (relay statistics):
- Change relay bandwidth reporting stats interval from 4 hours to 24
hours in order to reduce the efficiency of guard discovery
attacks. Fixes ticket 23856.
o Minor features (directory authority):
- Add an IPv6 address for the "bastet" directory authority. Closes
ticket 24394.
o Minor bugfixes (client):
- By default, do not enable storage of client-side DNS values. These
values were unused by default previously, but they should not have
been cached at all. Fixes bug 24050; bugfix on 0.2.6.3-alpha.
Changes in version 0.3.1.9 - 2017-12-01:
Tor 0.3.1.9 backports important security and stability fixes from the
0.3.2 development series. All Tor users should upgrade to this
release, or to another of the releases coming out today.
o Major bugfixes (security, backport from 0.3.2.6-alpha):
- Fix a denial of service bug where an attacker could use a
malformed directory object to cause a Tor instance to pause while
OpenSSL would try to read a passphrase from the terminal. (Tor
instances run without a terminal, which is the case for most Tor
packages, are not impacted.) Fixes bug 24246; bugfix on every
version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
Found by OSS-Fuzz as testcase 6360145429790720.
- Fix a denial of service issue where an attacker could crash a
directory authority using a malformed router descriptor. Fixes bug
24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
and CVE-2017-8820.
- When checking for replays in the INTRODUCE1 cell data for a
(legacy) onion service, correctly detect replays in the RSA-
encrypted part of the cell. We were previously checking for
replays on the entire cell, but those can be circumvented due to
the malleability of Tor's legacy hybrid encryption. This fix helps
prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
and CVE-2017-8819.
o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
- Fix a use-after-free error that could crash v2 Tor onion services
when they failed to open circuits while expiring introduction
points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
also tracked as TROVE-2017-013 and CVE-2017-8823.
o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
- When running as a relay, make sure that we never build a path
through ourselves, even in the case where we have somehow lost the
version of our descriptor appearing in the consensus. Fixes part
of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
as TROVE-2017-012 and CVE-2017-8822.
- When running as a relay, make sure that we never choose ourselves
as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
- Fix an issue causing DNS to fail on high-bandwidth exit nodes,
making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
identifying and finding a workaround to this bug and to Moritz,
Arthur Edelstein, and Roger for helping to track it down and
analyze it.
o Minor features (bridge):
- Bridges now include notice in their descriptors that they are
bridges, and notice of their distribution status, based on their
publication settings. Implements ticket 18329. For more fine-
grained control of how a bridge is distributed, upgrade to 0.3.2.x
or later.
o Minor features (directory authority, backport from 0.3.2.6-alpha):
- Add an IPv6 address for the "bastet" directory authority. Closes
ticket 24394.
o Minor features (geoip):
- Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
Country database.
o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
- Avoid unnecessary calls to directory_fetches_from_authorities() on
relays, to prevent spurious address resolutions and descriptor
rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
bugfix on in 0.2.8.1-alpha.
o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
- Fix unused variable warnings in donna's Curve25519 SSE2 code.
Fixes bug 22895; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
- When a circuit is marked for close, do not attempt to package any
cells for channels on that circuit. Previously, we would detect
this condition lower in the call stack, when we noticed that the
circuit had no attached channel, and log an annoying message.
Fixes bug 8185; bugfix on 0.2.5.4-alpha.
o Minor bugfixes (onion service, backport from 0.3.2.5-alpha):
- Rename the consensus parameter "hsdir-interval" to "hsdir_interval"
so it matches dir-spec.txt. Fixes bug 24262; bugfix
on 0.3.1.1-alpha.
o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
- Avoid a crash when transitioning from client mode to bridge mode.
Previously, we would launch the worker threads whenever our
"public server" mode changed, but not when our "server" mode
changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
Changes in version 0.3.0.13 - 2017-12-01
Tor 0.3.0.13 backports important security and stability bugfixes from
later Tor releases. All Tor users should upgrade to this release, or
to another of the releases coming out today.
Note: the Tor 0.3.0 series will no longer be supported after 26 Jan
2018. If you need a release with long-term support, please stick with
the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
o Major bugfixes (security, backport from 0.3.2.6-alpha):
- Fix a denial of service bug where an attacker could use a
malformed directory object to cause a Tor instance to pause while
OpenSSL would try to read a passphrase from the terminal. (Tor
instances run without a terminal, which is the case for most Tor
packages, are not impacted.) Fixes bug 24246; bugfix on every
version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
Found by OSS-Fuzz as testcase 6360145429790720.
- Fix a denial of service issue where an attacker could crash a
directory authority using a malformed router descriptor. Fixes bug
24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
and CVE-2017-8820.
- When checking for replays in the INTRODUCE1 cell data for a
(legacy) onion service, correctly detect replays in the RSA-
encrypted part of the cell. We were previously checking for
replays on the entire cell, but those can be circumvented due to
the malleability of Tor's legacy hybrid encryption. This fix helps
prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
and CVE-2017-8819.
o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
- Fix a use-after-free error that could crash v2 Tor onion services
when they failed to open circuits while expiring introduction
points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
also tracked as TROVE-2017-013 and CVE-2017-8823.
o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
- When running as a relay, make sure that we never build a path
through ourselves, even in the case where we have somehow lost the
version of our descriptor appearing in the consensus. Fixes part
of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
as TROVE-2017-012 and CVE-2017-8822.
- When running as a relay, make sure that we never choose ourselves
as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
- Fix an issue causing DNS to fail on high-bandwidth exit nodes,
making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
identifying and finding a workaround to this bug and to Moritz,
Arthur Edelstein, and Roger for helping to track it down and
analyze it.
o Minor features (security, windows, backport from 0.3.1.1-alpha):
- Enable a couple of pieces of Windows hardening: one
(HeapEnableTerminationOnCorruption) that has been on-by-default
since Windows 8, and unavailable before Windows 7; and one
(PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
affect us, but shouldn't do any harm. Closes ticket 21953.
o Minor features (bridge, backport from 0.3.1.9):
- Bridges now include notice in their descriptors that they are
bridges, and notice of their distribution status, based on their
publication settings. Implements ticket 18329. For more fine-
grained control of how a bridge is distributed, upgrade to 0.3.2.x
or later.
o Minor features (directory authority, backport from 0.3.2.6-alpha):
- Add an IPv6 address for the "bastet" directory authority. Closes
ticket 24394.
o Minor features (geoip):
- Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
Country database.
o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
- Avoid unnecessary calls to directory_fetches_from_authorities() on
relays, to prevent spurious address resolutions and descriptor
rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
bugfix on in 0.2.8.1-alpha.
o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
- Fix unused variable warnings in donna's Curve25519 SSE2 code.
Fixes bug 22895; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
- When a circuit is marked for close, do not attempt to package any
cells for channels on that circuit. Previously, we would detect
this condition lower in the call stack, when we noticed that the
circuit had no attached channel, and log an annoying message.
Fixes bug 8185; bugfix on 0.2.5.4-alpha.
o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
- Avoid a crash when transitioning from client mode to bridge mode.
Previously, we would launch the worker threads whenever our
"public server" mode changed, but not when our "server" mode
changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (testing, backport from 0.3.1.6-rc):
- Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
Changes in version 0.2.9.14 - 2017-12-01
Tor 0.3.0.13 backports important security and stability bugfixes from
later Tor releases. All Tor users should upgrade to this release, or
to another of the releases coming out today.
o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
- Fix an issue causing DNS to fail on high-bandwidth exit nodes,
making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
identifying and finding a workaround to this bug and to Moritz,
Arthur Edelstein, and Roger for helping to track it down and
analyze it.
o Major bugfixes (security, backport from 0.3.2.6-alpha):
- Fix a denial of service bug where an attacker could use a
malformed directory object to cause a Tor instance to pause while
OpenSSL would try to read a passphrase from the terminal. (Tor
instances run without a terminal, which is the case for most Tor
packages, are not impacted.) Fixes bug 24246; bugfix on every
version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
Found by OSS-Fuzz as testcase 6360145429790720.
- Fix a denial of service issue where an attacker could crash a
directory authority using a malformed router descriptor. Fixes bug
24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
and CVE-2017-8820.
- When checking for replays in the INTRODUCE1 cell data for a
(legacy) onion service, correctly detect replays in the RSA-
encrypted part of the cell. We were previously checking for
replays on the entire cell, but those can be circumvented due to
the malleability of Tor's legacy hybrid encryption. This fix helps
prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
and CVE-2017-8819.
o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
- Fix a use-after-free error that could crash v2 Tor onion services
when they failed to open circuits while expiring introduction
points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
also tracked as TROVE-2017-013 and CVE-2017-8823.
o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
- When running as a relay, make sure that we never build a path
through ourselves, even in the case where we have somehow lost the
version of our descriptor appearing in the consensus. Fixes part
of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
as TROVE-2017-012 and CVE-2017-8822.
o Minor features (bridge, backport from 0.3.1.9):
- Bridges now include notice in their descriptors that they are
bridges, and notice of their distribution status, based on their
publication settings. Implements ticket 18329. For more fine-
grained control of how a bridge is distributed, upgrade to 0.3.2.x
or later.
o Minor features (directory authority, backport from 0.3.2.6-alpha):
- Add an IPv6 address for the "bastet" directory authority. Closes
ticket 24394.
o Minor features (geoip):
- Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
Country database.
o Minor features (security, windows, backport from 0.3.1.1-alpha):
- Enable a couple of pieces of Windows hardening: one
(HeapEnableTerminationOnCorruption) that has been on-by-default
since Windows 8, and unavailable before Windows 7; and one
(PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
affect us, but shouldn't do any harm. Closes ticket 21953.
o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
- Avoid unnecessary calls to directory_fetches_from_authorities() on
relays, to prevent spurious address resolutions and descriptor
rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
bugfix on in 0.2.8.1-alpha.
o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
- Fix unused variable warnings in donna's Curve25519 SSE2 code.
Fixes bug 22895; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
- When a circuit is marked for close, do not attempt to package any
cells for channels on that circuit. Previously, we would detect
this condition lower in the call stack, when we noticed that the
circuit had no attached channel, and log an annoying message.
Fixes bug 8185; bugfix on 0.2.5.4-alpha.
o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
- Avoid a crash when transitioning from client mode to bridge mode.
Previously, we would launch the worker threads whenever our
"public server" mode changed, but not when our "server" mode
changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (testing, backport from 0.3.1.6-rc):
- Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
Changes in version 0.2.8.17 - 2017-12-01
Tor 0.2.8.17 backports important security and stability bugfixes from
later Tor releases. All Tor users should upgrade to this release, or
to another of the releases coming out today.
Note: the Tor 0.2.8 series will no longer be supported after 1 Jan
2018. If you need a release with long-term support, please upgrade with
the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
o Major bugfixes (security, backport from 0.3.2.6-alpha):
- Fix a denial of service bug where an attacker could use a
malformed directory object to cause a Tor instance to pause while
OpenSSL would try to read a passphrase from the terminal. (Tor
instances run without a terminal, which is the case for most Tor
packages, are not impacted.) Fixes bug 24246; bugfix on every
version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
Found by OSS-Fuzz as testcase 6360145429790720.
- When checking for replays in the INTRODUCE1 cell data for a
(legacy) onion service, correctly detect replays in the RSA-
encrypted part of the cell. We were previously checking for
replays on the entire cell, but those can be circumvented due to
the malleability of Tor's legacy hybrid encryption. This fix helps
prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
and CVE-2017-8819.
o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
- Fix a use-after-free error that could crash v2 Tor onion services
when they failed to open circuits while expiring introduction
points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
also tracked as TROVE-2017-013 and CVE-2017-8823.
o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
- When running as a relay, make sure that we never build a path through
ourselves, even in the case where we have somehow lost the version of
our descriptor appearing in the consensus. Fixes part of bug 21534;
bugfix on 0.2.0.1-alpha. This issue is also tracked as TROVE-2017-012
and CVE-2017-8822.
o Minor features (bridge, backport from 0.3.1.9):
- Bridges now include notice in their descriptors that they are
bridges, and notice of their distribution status, based on their
publication settings. Implements ticket 18329. For more fine-
grained control of how a bridge is distributed, upgrade to 0.3.2.x
or later.
o Minor features (directory authority, backport from 0.3.2.6-alpha):
- Add an IPv6 address for the "bastet" directory authority. Closes
ticket 24394.
o Minor features (geoip):
- Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (testing, backport from 0.3.1.6-rc):
- Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
Changes in version 0.2.5.16 - 2017-12-01
Tor 0.2.5.13 backports important security and stability bugfixes from
later Tor releases. All Tor users should upgrade to this release, or
to another of the releases coming out today.
Note: the Tor 0.2.5 series will no longer be supported after 1 May
2018. If you need a release with long-term support, please upgrade to
the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
o Major bugfixes (security, backport from 0.3.2.6-alpha):
- Fix a denial of service bug where an attacker could use a
malformed directory object to cause a Tor instance to pause while
OpenSSL would try to read a passphrase from the terminal. (Tor
instances run without a terminal, which is the case for most Tor
packages, are not impacted.) Fixes bug 24246; bugfix on every
version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
Found by OSS-Fuzz as testcase 6360145429790720.
- When checking for replays in the INTRODUCE1 cell data for a
(legacy) onion service, correctly detect replays in the RSA-
encrypted part of the cell. We were previously checking for
replays on the entire cell, but those can be circumvented due to
the malleability of Tor's legacy hybrid encryption. This fix helps
prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
and CVE-2017-8819.
o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
- When running as a relay, make sure that we never build a path
through ourselves, even in the case where we have somehow lost the
version of our descriptor appearing in the consensus. Fixes part
of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
as TROVE-2017-012 and CVE-2017-8822.
o Minor features (bridge, backport from 0.3.1.9):
- Bridges now include notice in their descriptors that they are
bridges, and notice of their distribution status, based on their
publication settings. Implements ticket 18329. For more fine-
grained control of how a bridge is distributed, upgrade to 0.3.2.x
or later.
o Minor features (geoip):
- Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
Country database.
Changes in version 0.3.2.5-alpha - 2017-11-22
Tor 0.3.2.5-alpha is the fifth alpha release in the 0.3.2.x series. It
fixes several stability and reliability bugs, including a fix for
intermittent bootstrapping failures that some people have been seeing
since the 0.3.0.x series.
Please test this alpha out -- many of these fixes will soon be
backported to stable Tor versions if no additional bugs are found
in them.
o Major bugfixes (bootstrapping):
- Fetch descriptors aggressively whenever we lack enough to build
circuits, regardless of how many descriptors we are missing.
Previously, we would delay launching the fetch when we had fewer
than 15 missing descriptors, even if some of those descriptors
were blocking circuits from building. Fixes bug 23985; bugfix on
0.1.1.11-alpha. The effects of this bug became worse in
0.3.0.3-alpha, when we began treating missing descriptors from our
primary guards as a reason to delay circuits.
- Don't try fetching microdescriptors from relays that have failed
to deliver them in the past. Fixes bug 23817; bugfix
on 0.3.0.1-alpha.
o Minor features (directory authority):
- Make the "Exit" flag assignment only depend on whether the exit
policy allows connections to ports 80 and 443. Previously relays
would get the Exit flag if they allowed connections to one of
these ports and also port 6667. Resolves ticket 23637.
o Minor features (geoip):
- Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
Country database.
o Minor features (linux seccomp2 sandbox):
- Update the sandbox rules so that they should now work correctly
with Glibc 2.26. Closes ticket 24315.
o Minor features (logging):
- Downgrade a pair of log messages that could occur when an exit's
resolver gave us an unusual (but not forbidden) response. Closes
ticket 24097.
- Improve the message we log when re-enabling circuit build timeouts
after having received a consensus. Closes ticket 20963.
o Minor bugfixes (compilation):
- Fix a memory leak warning in one of the libevent-related
configuration tests that could occur when manually specifying
-fsanitize=address. Fixes bug 24279; bugfix on 0.3.0.2-alpha.
Found and patched by Alex Xu.
- When detecting OpenSSL on Windows from our configure script, make
sure to try linking with the ws2_32 library. Fixes bug 23783;
bugfix on 0.3.2.2-alpha.
o Minor bugfixes (control port, linux seccomp2 sandbox):
- Avoid a crash when attempting to use the seccomp2 sandbox together
with the OwningControllerProcess feature. Fixes bug 24198; bugfix
on 0.2.5.1-alpha.
o Minor bugfixes (control port, onion services):
- Report "FAILED" instead of "UPLOAD_FAILED" "FAILED" for the
HS_DESC event when a service is not able to upload a descriptor.
Fixes bug 24230; bugfix on 0.2.7.1-alpha.
o Minor bugfixes (directory cache):
- Recover better from empty or corrupt files in the consensus cache
directory. Fixes bug 24099; bugfix on 0.3.1.1-alpha.
- When a consensus diff calculation is only partially successful,
only record the successful parts as having succeeded. Partial
success can happen if (for example) one compression method fails
but the others succeed. Previously we misrecorded all the
calculations as having succeeded, which would later cause a
nonfatal assertion failure. Fixes bug 24086; bugfix
on 0.3.1.1-alpha.
o Minor bugfixes (logging):
- Only log once if we notice that KIST support is gone. Fixes bug
24158; bugfix on 0.3.2.1-alpha.
- Suppress a log notice when relay descriptors arrive. We already
have a bootstrap progress for this so no need to log notice
everytime tor receives relay descriptors. Microdescriptors behave
the same. Fixes bug 23861; bugfix on 0.2.8.2-alpha.
o Minor bugfixes (network layer):
- When closing a connection via close_connection_immediately(), we
mark it as "not blocked on bandwidth", to prevent later calls from
trying to unblock it, and give it permission to read. This fixes a
backtrace warning that can happen on relays under various
circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
o Minor bugfixes (onion services):
- The introduction circuit was being timed out too quickly while
waiting for the rendezvous circuit to complete. Keep the intro
circuit around longer instead of timing out and reopening new ones
constantly. Fixes bug 23681; bugfix on 0.2.4.8-alpha.
- Rename the consensus parameter "hsdir-interval" to "hsdir_interval"
so it matches dir-spec.txt. Fixes bug 24262; bugfix
on 0.3.1.1-alpha.
- Silence a warning about failed v3 onion descriptor uploads that
can happen naturally under certain edge cases. Fixes part of bug
23662; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (tests):
- Fix a memory leak in one of the bridge-distribution test cases.
Fixes bug 24345; bugfix on 0.3.2.3-alpha.
- Fix a bug in our fuzzing mock replacement for crypto_pk_checksig(),
to correctly handle cases where a caller gives it an RSA key of
under 160 bits. (This is not actually a bug in Tor itself, but
rather in our fuzzing code.) Fixes bug 24247; bugfix on
0.3.0.3-alpha. Found by OSS-Fuzz as issue 4177.
o Documentation:
- Add notes in man page regarding OS support for the various
scheduler types. Attempt to use less jargon in the scheduler
section. Closes ticket 24254.
Changes in version 0.3.2.4-alpha - 2017-11-08
Tor 0.3.2.4-alpha is the fourth alpha release in the 0.3.2.x series.
It fixes several stability and reliability bugs, especially including
a major reliability issue that has been plaguing fast exit relays in
recent months.
o Major bugfixes (exit relays, DNS):
- Fix an issue causing DNS to fail on high-bandwidth exit nodes,
making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
identifying and finding a workaround to this bug and to Moritz,
Arthur Edelstein, and Roger for helping to track it down and
analyze it.
o Major bugfixes (scheduler, channel):
- Stop processing scheduled channels if they closed while flushing
cells. This can happen if the write on the connection fails
leading to the channel being closed while in the scheduler loop.
Fixes bug 23751; bugfix on 0.3.2.1-alpha.
o Minor features (logging, scheduler):
- Introduce a SCHED_BUG() function to log extra information about
the scheduler state if we ever catch a bug in the scheduler.
Closes ticket 23753.
o Minor features (removed deprecations):
- The ClientDNSRejectInternalAddresses flag can once again be set in
non-testing Tor networks, so long as they do not use the default
directory authorities. This change also removes the deprecation of
this flag from 0.2.9.2-alpha. Closes ticket 21031.
o Minor features (testing):
- Our fuzzing tests now test the encrypted portions of v3 onion
service descriptors. Implements more of 21509.
o Minor bugfixes (directory client):
- On failure to download directory information, delay retry attempts
by a random amount based on the "decorrelated jitter" algorithm.
Our previous delay algorithm tended to produce extra-long delays
too easily. Fixes bug 23816; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (IPv6, v3 single onion services):
- Remove buggy code for IPv6-only v3 single onion services, and
reject attempts to configure them. This release supports IPv4,
dual-stack, and IPv6-only v3 onion services; and IPv4 and dual-
stack v3 single onion services. Fixes bug 23820; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (logging, relay):
- Give only a protocol warning when the ed25519 key is not
consistent between the descriptor and microdescriptor of a relay.
This can happen, for instance, if the relay has been flagged
NoEdConsensus. Fixes bug 24025; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (manpage, onion service):
- Document that the HiddenServiceNumIntroductionPoints option is
0-10 for v2 services and 0-20 for v3 services. Fixes bug 24115;
bugfix on 0.3.2.1-alpha.
o Minor bugfixes (memory leaks):
- Fix a minor memory leak at exit in the KIST scheduler. This bug
should have no user-visible impact. Fixes bug 23774; bugfix
on 0.3.2.1-alpha.
- Fix a memory leak when decrypting a badly formatted v3 onion
service descriptor. Fixes bug 24150; bugfix on 0.3.2.1-alpha.
Found by OSS-Fuzz; this is OSS-Fuzz issue 3994.
o Minor bugfixes (onion services):
- Cache some needed onion service client information instead of
constantly computing it over and over again. Fixes bug 23623;
bugfix on 0.3.2.1-alpha.
- Properly retry HSv3 descriptor fetches when missing required
directory information. Fixes bug 23762; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (path selection):
- When selecting relays by bandwidth, avoid a rounding error that
could sometimes cause load to be imbalanced incorrectly.
Previously, we would always round upwards; now, we round towards
the nearest integer. This had the biggest effect when a relay's
weight adjustments should have given it weight 0, but it got
weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
- When calculating the fraction of nodes that have descriptors, and
all nodes in the network have zero bandwidths, count the number of
nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
- Actually log the total bandwidth in compute_weighted_bandwidths().
Fixes bug 24170; bugfix on 0.2.4.3-alpha.
o Minor bugfixes (relay, crash):
- Avoid a crash when transitioning from client mode to bridge mode.
Previously, we would launch the worker threads whenever our
"public server" mode changed, but not when our "server" mode
changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (testing):
- Fix a spurious fuzzing-only use of an uninitialized value. Found
by Brian Carpenter. Fixes bug 24082; bugfix on 0.3.0.3-alpha.
- Test that IPv6-only clients can use microdescriptors when running
"make test-network-all". Requires chutney master 61c28b9 or later.
Closes ticket 24109.
Changes in version 0.3.2.3-alpha - 2017-10-27
Tor 0.3.2.3-alpha is the third release in the 0.3.2 series. It fixes
numerous small bugs in earlier versions of 0.3.2.x, and adds a new
directory authority, Bastet.
o Directory authority changes:
- Add "Bastet" as a ninth directory authority to the default list.
Closes ticket 23910.
- The directory authority "Longclaw" has changed its IP address.
Closes ticket 23592.
o Minor features (bridge):
- Bridge relays can now set the BridgeDistribution config option to
add a "bridge-distribution-request" line to their bridge
descriptor, which tells BridgeDB how they'd like their bridge
address to be given out. (Note that as of Oct 2017, BridgeDB does
not yet implement this feature.) As a side benefit, this feature
provides a way to distinguish bridge descriptors from non-bridge
descriptors. Implements tickets 18329.
o Minor features (client, entry guards):
- Improve log messages when missing descriptors for primary guards.
Resolves ticket 23670.
o Minor features (geoip):
- Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (bridge):
- Overwrite the bridge address earlier in the process of retrieving
its descriptor, to make sure we reach it on the configured
address. Fixes bug 20532; bugfix on 0.2.0.10-alpha.
o Minor bugfixes (documentation):
- Document better how to read gcov, and what our gcov postprocessing
scripts do. Fixes bug 23739; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (entry guards):
- Tor now updates its guard state when it reads a consensus
regardless of whether it's missing descriptors. That makes tor use
its primary guards to fetch descriptors in some edge cases where
it would previously have used fallback directories. Fixes bug
23862; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (hidden service client):
- When handling multiple SOCKS request for the same .onion address,
only fetch the service descriptor once.
- When a descriptor fetch fails with a non-recoverable error, close
all pending SOCKS requests for that .onion. Fixes bug 23653;
bugfix on 0.3.2.1-alpha.
o Minor bugfixes (hidden service):
- Always regenerate missing hidden service public key files. Prior
to this, if the public key was deleted from disk, it wouldn't get
recreated. Fixes bug 23748; bugfix on 0.3.2.2-alpha. Patch
from "cathugger".
- Make sure that we have a usable ed25519 key when the intro point
relay supports ed25519 link authentication. Fixes bug 24002;
bugfix on 0.3.2.1-alpha.
o Minor bugfixes (hidden service, v2):
- When reloading configured hidden services, copy all information
from the old service object. Previously, some data was omitted,
causing delays in descriptor upload, and other bugs. Fixes bug
23790; bugfix on 0.2.1.9-alpha.
o Minor bugfixes (memory safety, defensive programming):
- Clear the target address when node_get_prim_orport() returns
early. Fixes bug 23874; bugfix on 0.2.8.2-alpha.
o Minor bugfixes (relay):
- Avoid a BUG warning when receiving a dubious CREATE cell while an
option transition is in progress. Fixes bug 23952; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (testing):
- Adjust the GitLab CI configuration to more closely match that of
Travis CI. Fixes bug 23757; bugfix on 0.3.2.2-alpha.
- Prevent scripts/test/coverage from attempting to move gcov output
to the root directory. Fixes bug 23741; bugfix on 0.2.5.1-alpha.
- When running unit tests as root, skip a test that would fail
because it expects a permissions error. This affects some
continuous integration setups. Fixes bug 23758; bugfix
on 0.3.2.2-alpha.
- Stop unconditionally mirroring the tor repository in GitLab CI.
This prevented developers from enabling GitLab CI on master. Fixes
bug 23755; bugfix on 0.3.2.2-alpha.
- Fix the hidden service v3 descriptor decoding fuzzing to use the
latest decoding API correctly. Fixes bug 21509; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (warnings):
- When we get an HTTP request on a SOCKS port, tell the user about
the new HTTPTunnelPort option. Previously, we would give a "Tor is
not an HTTP Proxy" message, which stopped being true when
HTTPTunnelPort was introduced. Fixes bug 23678; bugfix
on 0.3.2.1-alpha.
Changes in version 0.2.5.15 - 2017-10-25
Tor 0.2.5.15 backports a collection of bugfixes from later Tor release
series. It also adds a new directory authority, Bastet.
Note: the Tor 0.2.5 series will no longer be supported after 1 May
2018. If you need a release with long-term support, please upgrade to
the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
o Directory authority changes:
- Add "Bastet" as a ninth directory authority to the default list.
Closes ticket 23910.
- The directory authority "Longclaw" has changed its IP address.
Closes ticket 23592.
o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
- Avoid an assertion failure bug affecting our implementation of
inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
handling of "0xx" differs from what we had expected. Fixes bug
22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
o Minor features (geoip):
- Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
- Fix a memset() off the end of an array when packing cells. This
bug should be harmless in practice, since the corrupted bytes are
still in the same structure, and are always padding bytes,
ignored, or immediately overwritten, depending on compiler
behavior. Nevertheless, because the memset()'s purpose is to make
sure that any other cell-handling bugs can't expose bytes to the
network, we need to fix it. Fixes bug 22737; bugfix on
0.2.4.11-alpha. Fixes CID 1401591.
o Build features (backport from 0.3.1.5-alpha):
- Tor's repository now includes a Travis Continuous Integration (CI)
configuration file (.travis.yml). This is meant to help new
developers and contributors who fork Tor to a Github repository be
better able to test their changes, and understand what we expect
to pass. To use this new build feature, you must fork Tor to your
Github account, then go into the "Integrations" menu in the
repository settings for your fork and enable Travis, then push
your changes. Closes ticket 22636.
Changes in version 0.2.8.16 - 2017-10-25
Tor 0.2.8.16 backports a collection of bugfixes from later Tor release
series, including a bugfix for a crash issue that had affected relays
under memory pressure. It also adds a new directory authority, Bastet.
Note: the Tor 0.2.8 series will no longer be supported after 1 Jan
2018. If you need a release with long-term support, please stick with
the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
o Directory authority changes:
- Add "Bastet" as a ninth directory authority to the default list.
Closes ticket 23910.
- The directory authority "Longclaw" has changed its IP address.
Closes ticket 23592.
o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
- Fix a timing-based assertion failure that could occur when the
circuit out-of-memory handler freed a connection's output buffer.
Fixes bug 23690; bugfix on 0.2.6.1-alpha.
o Minor features (directory authorities, backport from 0.3.2.2-alpha):
- Remove longclaw's IPv6 address, as it will soon change. Authority
IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
3/8 directory authorities with IPv6 addresses, but there are also
52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
o Minor features (geoip):
- Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
Country database.
Changes in version 0.2.9.13 - 2017-10-25
Tor 0.2.9.13 backports a collection of bugfixes from later Tor release
series, including a bugfix for a crash issue that had affected relays
under memory pressure. It also adds a new directory authority, Bastet.
o Directory authority changes:
- Add "Bastet" as a ninth directory authority to the default list.
Closes ticket 23910.
- The directory authority "Longclaw" has changed its IP address.
Closes ticket 23592.
o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
- Fix a timing-based assertion failure that could occur when the
circuit out-of-memory handler freed a connection's output buffer.
Fixes bug 23690; bugfix on 0.2.6.1-alpha.
o Minor features (directory authorities, backport from 0.3.2.2-alpha):
- Remove longclaw's IPv6 address, as it will soon change. Authority
IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
3/8 directory authorities with IPv6 addresses, but there are also
52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
o Minor features (geoip):
- Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (directory authority, backport from 0.3.1.5-alpha):
- When a directory authority rejects a descriptor or extrainfo with
a given digest, mark that digest as undownloadable, so that we do
not attempt to download it again over and over. We previously
tried to avoid downloading such descriptors by other means, but we
didn't notice if we accidentally downloaded one anyway. This
behavior became problematic in 0.2.7.2-alpha, when authorities
began pinning Ed25519 keys. Fixes bug 22349; bugfix
on 0.2.1.19-alpha.
o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
- Clear the address when node_get_prim_orport() returns early.
Fixes bug 23874; bugfix on 0.2.8.2-alpha.
o Minor bugfixes (Windows service, backport from 0.3.1.6-rc):
- When running as a Windows service, set the ID of the main thread
correctly. Failure to do so made us fail to send log messages to
the controller in 0.2.1.16-rc, slowed down controller event
delivery in 0.2.7.3-rc and later, and crash with an assertion
failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
Patch and diagnosis from "Vort".
Changes in version 0.3.0.12 - 2017-10-25
Tor 0.3.0.12 backports a collection of bugfixes from later Tor release
series, including a bugfix for a crash issue that had affected relays
under memory pressure. It also adds a new directory authority, Bastet.
Note: the Tor 0.3.0 series will no longer be supported after 26 Jan
2018. If you need a release with long-term support, please stick with
the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
o Directory authority changes:
- Add "Bastet" as a ninth directory authority to the default list.
Closes ticket 23910.
- The directory authority "Longclaw" has changed its IP address.
Closes ticket 23592.
o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
- Fix a timing-based assertion failure that could occur when the
circuit out-of-memory handler freed a connection's output buffer.
Fixes bug 23690; bugfix on 0.2.6.1-alpha.
o Minor features (directory authorities, backport from 0.3.2.2-alpha):
- Remove longclaw's IPv6 address, as it will soon change. Authority
IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
3/8 directory authorities with IPv6 addresses, but there are also
52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
o Minor features (geoip):
- Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (directory authority, backport from 0.3.1.5-alpha):
- When a directory authority rejects a descriptor or extrainfo with
a given digest, mark that digest as undownloadable, so that we do
not attempt to download it again over and over. We previously
tried to avoid downloading such descriptors by other means, but we
didn't notice if we accidentally downloaded one anyway. This
behavior became problematic in 0.2.7.2-alpha, when authorities
began pinning Ed25519 keys. Fixes bug 22349; bugfix
on 0.2.1.19-alpha.
o Minor bugfixes (hidden service, relay, backport from 0.3.2.2-alpha):
- Avoid a possible double close of a circuit by the intro point on
error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
bugfix on 0.3.0.1-alpha.
o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
- Clear the address when node_get_prim_orport() returns early.
Fixes bug 23874; bugfix on 0.2.8.2-alpha.
o Minor bugfixes (Windows service, backport from 0.3.1.6-rc):
- When running as a Windows service, set the ID of the main thread
correctly. Failure to do so made us fail to send log messages to
the controller in 0.2.1.16-rc, slowed down controller event
delivery in 0.2.7.3-rc and later, and crash with an assertion
failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
Patch and diagnosis from "Vort".
Changes in version 0.3.1.8 - 2017-10-25
Tor 0.3.1.8 is the second stable release in the 0.3.1 series.
It includes several bugfixes, including a bugfix for a crash issue
that had affected relays under memory pressure. It also adds
a new directory authority, Bastet.
o Directory authority changes:
- Add "Bastet" as a ninth directory authority to the default list.
Closes ticket 23910.
- The directory authority "Longclaw" has changed its IP address.
Closes ticket 23592.
o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
- Fix a timing-based assertion failure that could occur when the
circuit out-of-memory handler freed a connection's output buffer.
Fixes bug 23690; bugfix on 0.2.6.1-alpha.
o Minor features (directory authorities, backport from 0.3.2.2-alpha):
- Remove longclaw's IPv6 address, as it will soon change. Authority
IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
3/8 directory authorities with IPv6 addresses, but there are also
52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
o Minor features (geoip):
- Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (compilation, backport from 0.3.2.2-alpha):
- Fix a compilation warning when building with zstd support on
32-bit platforms. Fixes bug 23568; bugfix on 0.3.1.1-alpha. Found
and fixed by Andreas Stieger.
o Minor bugfixes (compression, backport from 0.3.2.2-alpha):
- Handle a pathological case when decompressing Zstandard data when
the output buffer size is zero. Fixes bug 23551; bugfix
on 0.3.1.1-alpha.
o Minor bugfixes (directory authority, backport from 0.3.2.1-alpha):
- Remove the length limit on HTTP status lines that authorities can
send in their replies. Fixes bug 23499; bugfix on 0.3.1.6-rc.
o Minor bugfixes (hidden service, relay, backport from 0.3.2.2-alpha):
- Avoid a possible double close of a circuit by the intro point on
error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
bugfix on 0.3.0.1-alpha.
o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
- Clear the address when node_get_prim_orport() returns early.
Fixes bug 23874; bugfix on 0.2.8.2-alpha.
o Minor bugfixes (unit tests, backport from 0.3.2.2-alpha):
- Fix additional channelpadding unit test failures by using mocked
time instead of actual time for all tests. Fixes bug 23608; bugfix
on 0.3.1.1-alpha.
Changes in version 0.3.2.2-alpha - 2017-09-29
Tor 0.3.2.2-alpha is the second release in the 0.3.2 series. This
release fixes several minor bugs in the new scheduler and next-
generation onion services; both features were newly added in the 0.3.2
series. Other fixes in this alpha include several fixes for non-fatal
tracebacks which would appear in logs.
With the aim to stabilise the 0.3.2 series by 15 December 2017, this
alpha does not contain any substantial new features. Minor features
include better testing and logging.
The following comprises the complete list of changes included
in 0.3.2.2-alpha:
o Major bugfixes (relay, crash, assertion failure):
- Fix a timing-based assertion failure that could occur when the
circuit out-of-memory handler freed a connection's output buffer.
Fixes bug 23690; bugfix on 0.2.6.1-alpha.
o Major bugfixes (scheduler):
- If a channel is put into the scheduler's pending list, then it
starts closing, and then if the scheduler runs before it finishes
closing, the scheduler will get stuck trying to flush its cells
while the lower layers refuse to cooperate. Fix that race
condition by giving the scheduler an escape method. Fixes bug
23676; bugfix on 0.3.2.1-alpha.
o Minor features (build, compilation):
- The "check-changes" feature is now part of the "make check" tests;
we'll use it to try to prevent misformed changes files from
accumulating. Closes ticket 23564.
- Tor builds should now fail if there are any mismatches between the
C type representing a configuration variable and the C type the
data-driven parser uses to store a value there. Previously, we
needed to check these by hand, which sometimes led to mistakes.
Closes ticket 23643.
o Minor features (directory authorities):
- Remove longclaw's IPv6 address, as it will soon change. Authority
IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
3/8 directory authorities with IPv6 addresses, but there are also
52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
o Minor features (hidden service, circuit, logging):
- Improve logging of many callsite in the circuit subsystem to print
the circuit identifier(s).
- Log when we cleanup an intro point from a service so we know when
and for what reason it happened. Closes ticket 23604.
o Minor features (logging):
- Log more circuit information whenever we are about to try to
package a relay cell on a circuit with a nonexistent n_chan.
Attempt to diagnose ticket 8185.
- Improve info-level log identification of particular circuits, to
help with debugging. Closes ticket 23645.
o Minor features (relay):
- When choosing which circuits can be expired as unused, consider
circuits from clients even if those clients used regular CREATE
cells to make them; and do not consider circuits from relays even
if they were made with CREATE_FAST. Part of ticket 22805.
o Minor features (robustness):
- Change several fatal assertions when flushing buffers into non-
fatal assertions, to prevent any recurrence of 23690.
o Minor features (spec conformance, bridge, diagnostic):
- When handling the USERADDR command on an ExtOrPort, warn when the
transports provides a USERADDR with no port. In a future version,
USERADDR commands of this format may be rejected. Detects problems
related to ticket 23080.
o Minor features (testing):
- Add a unit test to make sure that our own generated platform
string will be accepted by directory authorities. Closes
ticket 22109.
o Minor bugfixes (bootstrapping):
- When warning about state file clock skew, report the correct
direction for the detected skew. Fixes bug 23606; bugfix
on 0.2.8.1-alpha.
- Avoid an assertion failure when logging a state file clock skew
very early in bootstrapping. Fixes bug 23607; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (build, compilation):
- Fix a compilation warning when building with zstd support on
32-bit platforms. Fixes bug 23568; bugfix on 0.3.1.1-alpha. Found
and fixed by Andreas Stieger.
- When searching for OpenSSL, don't accept any OpenSSL library that
lacks TLSv1_1_method(): Tor doesn't build with those versions.
Additionally, look in /usr/local/opt/openssl, if it's present.
These changes together repair the default build on OSX systems
with Homebrew installed. Fixes bug 23602; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (compression):
- Handle a pathological case when decompressing Zstandard data when
the output buffer size is zero. Fixes bug 23551; bugfix
on 0.3.1.1-alpha.
o Minor bugfixes (documentation):
- Fix manpage to not refer to the obsolete (and misspelled)
UseEntryGuardsAsDirectoryGuards parameter in the description of
NumDirectoryGuards. Fixes bug 23611; bugfix on 0.2.4.8-alpha.
o Minor bugfixes (hidden service v3):
- Don't log an assertion failure when we can't find the right
information to extend to an introduction point. In rare cases,
this could happen, causing a warning, even though tor would
recover gracefully. Fixes bug 23159; bugfix on 0.3.2.1-alpha.
- Pad RENDEZVOUS cell up to the size of the legacy cell which is
much bigger so the rendezvous point can't distinguish which hidden
service protocol is being used. Fixes bug 23420; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (hidden service, relay):
- Avoid a possible double close of a circuit by the intro point on
error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
bugfix on 0.3.0.1-alpha.
o Minor bugfixes (logging, relay shutdown, annoyance):
- When a circuit is marked for close, do not attempt to package any
cells for channels on that circuit. Previously, we would detect
this condition lower in the call stack, when we noticed that the
circuit had no attached channel, and log an annoying message.
Fixes bug 8185; bugfix on 0.2.5.4-alpha.
o Minor bugfixes (scheduler):
- When switching schedulers due to a consensus change, we didn't
give the new scheduler a chance to react to the consensus. Fix
that. Fixes bug 23537; bugfix on 0.3.2.1-alpha.
- Make the KISTSchedRunInterval option a non negative value. With
this, the way to disable KIST through the consensus is to set it
to 0. Fixes bug 23539; bugfix on 0.3.2.1-alpha.
- Only notice log the selected scheduler when we switch scheduler
types. Fixes bug 23552; bugfix on 0.3.2.1-alpha.
- Avoid a compilation warning on macOS in scheduler_ev_add() caused
by a different tv_usec data type. Fixes bug 23575; bugfix
on 0.3.2.1-alpha.
- Make a hard exit if tor is unable to pick a scheduler which can
happen if the user specifies a scheduler type that is not
supported and not other types in Schedulers. Fixes bug 23581;
bugfix on 0.3.2.1-alpha.
- Properly initialize the scheduler last run time counter so it is
not 0 at the first tick. Fixes bug 23696; bugfix on 0.3.2.1-alpha.
o Minor bugfixes (testing):
- Capture and detect several "Result does not fit" warnings in unit
tests on platforms with 32-bit time_t. Fixes bug 21800; bugfix
on 0.2.9.3-alpha.
- Fix additional channelpadding unit test failures by using mocked
time instead of actual time for all tests. Fixes bug 23608; bugfix
on 0.3.1.1-alpha.
- The removal of some old scheduler options caused some tests to
fail on BSD systems. Assume current behavior is correct and make
the tests pass again. Fixes bug 23566; bugfix on 0.3.2.1-alpha.
o Code simplification and refactoring:
- Remove various ways of testing circuits and connections for
"clientness"; instead, favor channel_is_client(). Part of
ticket 22805.
o Deprecated features:
- The ReachableDirAddresses and ClientPreferIPv6DirPort options are
now deprecated; they do not apply to relays, and they have had no
effect on clients since 0.2.8.x. Closes ticket 19704.
o Documentation:
- HiddenServiceVersion man page entry wasn't mentioning the now
supported version 3. Fixes ticket 23580; bugfix on 0.3.2.1-alpha.
- Clarify that the Address option is entirely about setting an
advertised IPv4 address. Closes ticket 18891.
- Clarify the manpage's use of the term "address" to clarify what
kind of address is intended. Closes ticket 21405.
- Document that onion service subdomains are allowed, and ignored.
Closes ticket 18736.
Changes in version 0.3.2.1-alpha - 2017-09-18
Tor 0.3.2.1-alpha is the first release in the 0.3.2.x series. It
includes support for our next-generation ("v3") onion service
protocol, and adds a new circuit scheduler for more responsive
forwarding decisions from relays. There are also numerous other small
features and bugfixes here.
Below are the changes since Tor 0.3.1.7.
o Major feature (scheduler, channel):
- Tor now uses new schedulers to decide which circuits should
deliver cells first, in order to improve congestion at relays. The
first type is called "KIST" ("Kernel Informed Socket Transport"),
and is only available on Linux-like systems: it uses feedback from
the kernel to prevent the kernel's TCP buffers from growing too
full. The second new scheduler type is called "KISTLite": it
behaves the same as KIST, but runs on systems without kernel
support for inspecting TCP implementation details. The old
scheduler is still available, under the name "Vanilla". To change
the default scheduler preference order, use the new "Schedulers"
option. (The default preference order is "KIST,KISTLite,Vanilla".)
Matt Traudt implemented KIST, based on research by Rob Jansen,
John Geddes, Christ Wacek, Micah Sherr, and Paul Syverson. For
more information, see the design paper at
http://www.robgjansen.com/publications/kist-sec2014.pdf and the
followup implementation paper at https://arxiv.org/abs/1709.01044.
Closes ticket 12541.
o Major features (next-generation onion services):
- Tor now supports the next-generation onion services protocol for
clients and services! As part of this release, the core of
proposal 224 has been implemented and is available for
experimentation and testing by our users. This newer version of
onion services ("v3") features many improvements over the legacy
system, including:
a) Better crypto (replaced SHA1/DH/RSA1024
with SHA3/ed25519/curve25519)
b) Improved directory protocol, leaking much less information to
directory servers.
c) Improved directory protocol, with smaller surface for
targeted attacks.
d) Better onion address security against impersonation.
e) More extensible introduction/rendezvous protocol.
f) A cleaner and more modular codebase.
You can identify a next-generation onion address by its length:
they are 56 characters long, as in
"4acth47i6kxnvkewtm6q7ib2s3ufpo5sqbsnzjpbi7utijcltosqemad.onion".
In the future, we will release more options and features for v3
onion services, but we first need a testing period, so that the
current codebase matures and becomes more robust. Planned features
include: offline keys, advanced client authorization, improved
guard algorithms, and statistics. For full details, see
proposal 224.
Legacy ("v2") onion services will still work for the foreseeable
future, and will remain the default until this new codebase gets
tested and hardened. Service operators who want to experiment with
the new system can use the 'HiddenServiceVersion 3' torrc
directive along with the regular onion service configuration
options. We will publish a blog post about this new feature
soon! Enjoy!
o Major bugfixes (usability, control port):
- Report trusted clock skew indications as bootstrap errors, so
controllers can more easily alert users when their clocks are
wrong. Fixes bug 23506; bugfix on 0.1.2.6-alpha.
o Minor features (bug detection):
- Log a warning message with a stack trace for any attempt to call
get_options() during option validation. This pattern has caused
subtle bugs in the past. Closes ticket 22281.
o Minor features (client):
- You can now use Tor as a tunneled HTTP proxy: use the new
HTTPTunnelPort option to open a port that accepts HTTP CONNECT
requests. Closes ticket 22407.
- Add an extra check to make sure that we always use the newer guard
selection code for picking our guards. Closes ticket 22779.
- When downloading (micro)descriptors, don't split the list into
multiple requests unless we want at least 32 descriptors.
Previously, we split at 4, not 32, which led to significant
overhead in HTTP request size and degradation in compression
performance. Closes ticket 23220.
o Minor features (command line):
- Add a new commandline option, --key-expiration, which prints when
the current signing key is going to expire. Implements ticket
17639; patch by Isis Lovecruft.
o Minor features (control port):
- If an application tries to use the control port as an HTTP proxy,
respond with a meaningful "This is the Tor control port" message,
and log the event. Closes ticket 1667. Patch from Ravi
Chandra Padmala.
- Provide better error message for GETINFO desc/(id|name) when not
fetching router descriptors. Closes ticket 5847. Patch by
Kevin Butler.
- Add GETINFO "{desc,md}/download-enabled", to inform the controller
whether Tor will try to download router descriptors and
microdescriptors respectively. Closes ticket 22684.
- Added new GETINFO targets "ip-to-country/{ipv4,ipv6}-available",
so controllers can tell whether the geoip databases are loaded.
Closes ticket 23237.
- Adds a timestamp field to the CIRC_BW and STREAM_BW bandwidth
events. Closes ticket 19254. Patch by "DonnchaC".
o Minor features (development support):
- Developers can now generate a call-graph for Tor using the
"calltool" python program, which post-processes object dumps. It
should work okay on many Linux and OSX platforms, and might work
elsewhere too. To run it, install calltool from
https://gitweb.torproject.org/user/nickm/calltool.git and run
"make callgraph". Closes ticket 19307.
o Minor features (ed25519):
- Add validation function to checks for torsion components in
ed25519 public keys, used by prop224 client-side code. Closes
ticket 22006. Math help by Ian Goldberg.
o Minor features (exit relay, DNS):
- Improve the clarity and safety of the log message from evdns when
receiving an apparently spoofed DNS reply. Closes ticket 3056.
o Minor features (integration, hardening):
- Add a new NoExec option to prevent Tor from running other
programs. When this option is set to 1, Tor will never try to run
another program, regardless of the settings of
PortForwardingHelper, ClientTransportPlugin, or
ServerTransportPlugin. Once NoExec is set, it cannot be disabled
without restarting Tor. Closes ticket 22976.
o Minor features (logging):
- Improve the warning message for specifying a relay by nickname.
The previous message implied that nickname registration was still
part of the Tor network design, which it isn't. Closes
ticket 20488.
- If the sandbox filter fails to load, suggest to the user that
their kernel might not support seccomp2. Closes ticket 23090.
o Minor features (portability):
- Check at configure time whether uint8_t is the same type as
unsigned char. Lots of existing code already makes this
assumption, and there could be strict aliasing issues if the
assumption is violated. Closes ticket 22410.
o Minor features (relay, configuration):
- Reject attempts to use relative file paths when RunAsDaemon is
set. Previously, Tor would accept these, but the directory-
changing step of RunAsDaemon would give strange and/or confusing
results. Closes ticket 22731.
o Minor features (startup, safety):
- When configured to write a PID file, Tor now exits if it is unable
to do so. Previously, it would warn and continue. Closes
ticket 20119.
o Minor features (static analysis):
- The BUG() macro has been changed slightly so that Coverity no
longer complains about dead code if the bug is impossible. Closes
ticket 23054.
o Minor features (testing):
- The default chutney network tests now include tests for the v3
hidden service design. Make sure you have the latest version of
chutney if you want to run these. Closes ticket 22437.
- Add a unit test to verify that we can parse a hardcoded v2 hidden
service descriptor. Closes ticket 15554.
o Minor bugfixes (certificate handling):
- Fix a time handling bug in Tor certificates set to expire after
the year 2106. Fixes bug 23055; bugfix on 0.3.0.1-alpha. Found by
Coverity as CID 1415728.
o Minor bugfixes (client, usability):
- Refrain from needlessly rejecting SOCKS5-with-hostnames and
SOCKS4a requests that contain IP address strings, even when
SafeSocks in enabled, as this prevents user from connecting to
known IP addresses without relying on DNS for resolving. SafeSocks
still rejects SOCKS connections that connect to IP addresses when
those addresses are _not_ encoded as hostnames. Fixes bug 22461;
bugfix on Tor 0.2.6.2-alpha.
o Minor bugfixes (code correctness):
- Call htons() in extend_cell_format() for encoding a 16-bit value.
Previously we used ntohs(), which happens to behave the same on
all the platforms we support, but which isn't really correct.
Fixes bug 23106; bugfix on 0.2.4.8-alpha.
- For defense-in-depth, make the controller's write_escaped_data()
function robust to extremely long inputs. Fixes bug 19281; bugfix
on 0.1.1.1-alpha. Reported by Guido Vranken.
o Minor bugfixes (compilation):
- Fix unused-variable warnings in donna's Curve25519 SSE2 code.
Fixes bug 22895; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (consensus expiry):
- Check for adequate directory information correctly. Previously, Tor
would reconsider whether it had sufficient directory information
every 2 minutes. Fixes bug 23091; bugfix on 0.2.0.19-alpha.
o Minor bugfixes (directory protocol):
- Directory servers now include a "Date:" http header for response
codes other than 200. Clients starting with a skewed clock and a
recent consensus were getting "304 Not modified" responses from
directory authorities, so without the Date header, the client
would never hear about a wrong clock. Fixes bug 23499; bugfix
on 0.0.8rc1.
- Make clients wait for 6 seconds before trying to download a
consensus from an authority. Fixes bug 17750; bugfix
on 0.2.8.1-alpha.
o Minor bugfixes (DoS-resistance):
- If future code asks if there are any running bridges, without
checking if bridges are enabled, log a BUG warning rather than
crashing. Fixes bug 23524; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (format strictness):
- Restrict several data formats to decimal. Previously, the
BuildTimeHistogram entries in the state file, the "bw=" entries in
the bandwidth authority file, and the process IDs passed to the
__OwningControllerProcess option could all be specified in hex or
octal as well as in decimal. This was not an intentional feature.
Fixes bug 22802; bugfixes on 0.2.2.1-alpha, 0.2.2.2-alpha,
and 0.2.2.28-beta.
o Minor bugfixes (heartbeat):
- If we fail to write a heartbeat message, schedule a retry for the
minimum heartbeat interval number of seconds in the future. Fixes
bug 19476; bugfix on 0.2.3.1-alpha.
o Minor bugfixes (linux seccomp2 sandbox, logging):
- Fix some messages on unexpected errors from the seccomp2 library.
Fixes bug 22750; bugfix on 0.2.5.1-alpha. Patch from "cypherpunks".
o Minor bugfixes (logging):
- Remove duplicate log messages regarding opening non-local
SocksPorts upon parsing config and opening listeners at startup.
Fixes bug 4019; bugfix on 0.2.3.3-alpha.
- Use a more comprehensible log message when telling the user
they've excluded every running exit node. Fixes bug 7890; bugfix
on 0.2.2.25-alpha.
- When logging the number of descriptors we intend to download per
directory request, do not log a number higher than then the number
of descriptors we're fetching in total. Fixes bug 19648; bugfix
on 0.1.1.8-alpha.
- When warning about a directory owned by the wrong user, log the
actual name of the user owning the directory. Previously, we'd log
the name of the process owner twice. Fixes bug 23487; bugfix
on 0.2.9.1-alpha.
- The tor specification says hop counts are 1-based, so fix two log
messages that mistakenly logged 0-based hop counts. Fixes bug
18982; bugfix on 0.2.6.2-alpha and 0.2.4.5-alpha. Patch by teor.
Credit to Xiaofan Li for reporting this issue.
o Minor bugfixes (portability):
- Stop using the PATH_MAX variable, which is not defined on GNU
Hurd. Fixes bug 23098; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (relay):
- When uploading our descriptor for the first time after startup,
report the reason for uploading as "Tor just started" rather than
leaving it blank. Fixes bug 22885; bugfix on 0.2.3.4-alpha.
- Avoid unnecessary calls to directory_fetches_from_authorities() on
relays, to prevent spurious address resolutions and descriptor
rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
bugfix on in 0.2.8.1-alpha.
o Minor bugfixes (tests):
- Fix a broken unit test for the OutboundAddress option: the parsing
function was never returning an error on failure. Fixes bug 23366;
bugfix on 0.3.0.3-alpha.
- Fix a signed-integer overflow in the unit tests for
dir/download_status_random_backoff, which was untriggered until we
fixed bug 17750. Fixes bug 22924; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (usability, control port):
- Stop making an unnecessary routerlist check in NETINFO clock skew
detection; this was preventing clients from reporting NETINFO clock
skew to controllers. Fixes bug 23532; bugfix on 0.2.4.4-alpha.
o Code simplification and refactoring:
- Extract the code for handling newly-open channels into a separate
function from the general code to handle channel state
transitions. This change simplifies our callgraph, reducing the
size of the largest strongly connected component by roughly a
factor of two. Closes ticket 22608.
- Remove dead code for largely unused statistics on the number of
times we've attempted various public key operations. Fixes bug
19871; bugfix on 0.1.2.4-alpha. Fix by Isis Lovecruft.
- Remove several now-obsolete functions for asking about old
variants directory authority status. Closes ticket 22311; patch
from "huyvq".
- Remove some of the code that once supported "Named" and "Unnamed"
routers. Authorities no longer vote for these flags. Closes
ticket 22215.
- Rename the obsolete malleable hybrid_encrypt functions used in TAP
and old hidden services, to indicate that they aren't suitable for
new protocols or formats. Closes ticket 23026.
- Replace our STRUCT_OFFSET() macro with offsetof(). Closes ticket
22521. Patch from Neel Chauhan.
- Split the enormous circuit_send_next_onion_skin() function into
multiple subfunctions. Closes ticket 22804.
- Split the portions of the buffer.c module that handle particular
protocols into separate modules. Part of ticket 23149.
- Use our test macros more consistently, to produce more useful
error messages when our unit tests fail. Add coccinelle patches to
allow us to re-check for test macro uses. Closes ticket 22497.
o Deprecated features:
- Deprecate HTTPProxy/HTTPProxyAuthenticator config options. They
only applies to direct unencrypted HTTP connections to your
directory server, which your Tor probably isn't using. Closes
ticket 20575.
o Documentation:
- Clarify in the manual that "Sandbox 1" is only supported on Linux
kernels. Closes ticket 22677.
- Document all values of PublishServerDescriptor in the manpage.
Closes ticket 15645.
- Improve the documentation for the directory port part of the
DirAuthority line. Closes ticket 20152.
- Restore documentation for the authorities' "approved-routers"
file. Closes ticket 21148.
o Removed features:
- The AllowDotExit option has been removed as unsafe. It has been
deprecated since 0.2.9.2-alpha. Closes ticket 23426.
- The ClientDNSRejectInternalAddresses flag can no longer be set on
non-testing networks. It has been deprecated since 0.2.9.2-alpha.
Closes ticket 21031.
- The controller API no longer includes an AUTHDIR_NEWDESCS event:
nobody was using it any longer. Closes ticket 22377.
Changes in version 0.2.8.15 - 2017-09-18
Tor 0.2.8.15 backports a collection of bugfixes from later
Tor series.
Most significantly, it includes a fix for TROVE-2017-008, a
security bug that affects hidden services running with the
SafeLogging option disabled. For more information, see
https://trac.torproject.org/projects/tor/ticket/23490
Note that Tor 0.2.8.x will no longer be supported after 1 Jan
2018. We suggest that you upgrade to the latest stable release if
possible. If you can't, we recommend that you upgrade at least to
0.2.9, which will be supported until 2020.
o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
- Avoid an assertion failure bug affecting our implementation of
inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
handling of "0xx" differs from what we had expected. Fixes bug
22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
o Minor features:
- Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
- Backport a fix for an "unused variable" warning that appeared
in some versions of mingw. Fixes bug 22838; bugfix on
0.2.8.1-alpha.
o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
- Fix a memset() off the end of an array when packing cells. This
bug should be harmless in practice, since the corrupted bytes are
still in the same structure, and are always padding bytes,
ignored, or immediately overwritten, depending on compiler
behavior. Nevertheless, because the memset()'s purpose is to make
sure that any other cell-handling bugs can't expose bytes to the
network, we need to fix it. Fixes bug 22737; bugfix on
0.2.4.11-alpha. Fixes CID 1401591.
o Build features (backport from 0.3.1.5-alpha):
- Tor's repository now includes a Travis Continuous Integration (CI)
configuration file (.travis.yml). This is meant to help new
developers and contributors who fork Tor to a Github repository be
better able to test their changes, and understand what we expect
to pass. To use this new build feature, you must fork Tor to your
Github account, then go into the "Integrations" menu in the
repository settings for your fork and enable Travis, then push
your changes. Closes ticket 22636.
Changes in version 0.2.9.12 - 2017-09-18
Tor 0.2.9.12 backports a collection of bugfixes from later
Tor series.
Most significantly, it includes a fix for TROVE-2017-008, a
security bug that affects hidden services running with the
SafeLogging option disabled. For more information, see
https://trac.torproject.org/projects/tor/ticket/23490
o Major features (security, backport from 0.3.0.2-alpha):
- Change the algorithm used to decide DNS TTLs on client and server
side, to better resist DNS-based correlation attacks like the
DefecTor attack of Greschbach, Pulls, Roberts, Winter, and
Feamster. Now relays only return one of two possible DNS TTL
values, and clients are willing to believe DNS TTL values up to 3
hours long. Closes ticket 19769.
o Major bugfixes (crash, directory connections, backport from 0.3.0.5-rc):
- Fix a rare crash when sending a begin cell on a circuit whose
linked directory connection had already been closed. Fixes bug
21576; bugfix on 0.2.9.3-alpha. Reported by Alec Muffett.
o Major bugfixes (DNS, backport from 0.3.0.2-alpha):
- Fix a bug that prevented exit nodes from caching DNS records for
more than 60 seconds. Fixes bug 19025; bugfix on 0.2.4.7-alpha.
o Major bugfixes (linux TPROXY support, backport from 0.3.1.1-alpha):
- Fix a typo that had prevented TPROXY-based transparent proxying
from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
Patch from "d4fq0fQAgoJ".
o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
- Avoid an assertion failure bug affecting our implementation of
inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
handling of "0xx" differs from what we had expected. Fixes bug
22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
o Minor features (code style, backport from 0.3.1.3-alpha):
- Add "Falls through" comments to our codebase, in order to silence
GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
Stieger. Closes ticket 22446.
o Minor features (geoip):
- Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (bandwidth accounting, backport from 0.3.1.1-alpha):
- Roll over monthly accounting at the configured hour and minute,
rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
Found by Andrey Karpov with PVS-Studio.
o Minor bugfixes (compilation, backport from 0.3.1.5-alpha):
- Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug 22915;
bugfix on 0.2.8.1-alpha.
- Fix warnings when building with libscrypt and openssl scrypt support
on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
- When building with certain versions the mingw C header files, avoid
float-conversion warnings when calling the C functions isfinite(),
isnan(), and signbit(). Fixes bug 22801; bugfix on 0.2.8.1-alpha.
o Minor bugfixes (compilation, backport from 0.3.1.7):
- Avoid compiler warnings in the unit tests for running tor_sscanf()
with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
- Backport a fix for an "unused variable" warning that appeared
in some versions of mingw. Fixes bug 22838; bugfix on
0.2.8.1-alpha.
o Minor bugfixes (controller, backport from 0.3.1.7):
- Do not crash when receiving a HSPOST command with an empty body.
Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
- Do not crash when receiving a POSTDESCRIPTOR command with an
empty body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
o Minor bugfixes (coverity build support, backport from 0.3.1.5-alpha):
- Avoid Coverity build warnings related to our BUG() macro. By
default, Coverity treats BUG() as the Linux kernel does: an
instant abort(). We need to override that so our BUG() macro
doesn't prevent Coverity from analyzing functions that use it.
Fixes bug 23030; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
- Fix a memset() off the end of an array when packing cells. This
bug should be harmless in practice, since the corrupted bytes are
still in the same structure, and are always padding bytes,
ignored, or immediately overwritten, depending on compiler
behavior. Nevertheless, because the memset()'s purpose is to make
sure that any other cell-handling bugs can't expose bytes to the
network, we need to fix it. Fixes bug 22737; bugfix on
0.2.4.11-alpha. Fixes CID 1401591.
o Minor bugfixes (file limits, osx, backport from 0.3.1.5-alpha):
- When setting the maximum number of connections allowed by the OS,
always allow some extra file descriptors for other files. Fixes
bug 22797; bugfix on 0.2.0.10-alpha.
o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.5-alpha):
- Avoid a sandbox failure when trying to re-bind to a socket and
mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.4-alpha):
- Permit the fchmod system call, to avoid crashing on startup when
starting with the seccomp2 sandbox and an unexpected set of
permissions on the data directory or its contents. Fixes bug
22516; bugfix on 0.2.5.4-alpha.
o Minor bugfixes (relay, backport from 0.3.0.5-rc):
- Avoid a double-marked-circuit warning that could happen when we
receive DESTROY cells under heavy load. Fixes bug 20059; bugfix
on 0.1.0.1-rc.
o Minor bugfixes (voting consistency, backport from 0.3.1.1-alpha):
- Reject version numbers with non-numeric prefixes (such as +, -, or
whitespace). Disallowing whitespace prevents differential version
parsing between POSIX-based and Windows platforms. Fixes bug 21507
and part of 21508; bugfix on 0.0.8pre1.
o Build features (backport from 0.3.1.5-alpha):
- Tor's repository now includes a Travis Continuous Integration (CI)
configuration file (.travis.yml). This is meant to help new
developers and contributors who fork Tor to a Github repository be
better able to test their changes, and understand what we expect
to pass. To use this new build feature, you must fork Tor to your
Github account, then go into the "Integrations" menu in the
repository settings for your fork and enable Travis, then push
your changes. Closes ticket 22636.
Changes in version 0.3.0.11 - 2017-09-18
Tor 0.3.0.11 backports a collection of bugfixes from Tor the 0.3.1
series.
Most significantly, it includes a fix for TROVE-2017-008, a
security bug that affects hidden services running with the
SafeLogging option disabled. For more information, see
https://trac.torproject.org/projects/tor/ticket/23490
o Minor features (code style, backport from 0.3.1.7):
- Add "Falls through" comments to our codebase, in order to silence
GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
Stieger. Closes ticket 22446.
o Minor features:
- Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (compilation, backport from 0.3.1.7):
- Avoid compiler warnings in the unit tests for calling tor_sscanf()
with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
o Minor bugfixes (controller, backport from 0.3.1.7):
- Do not crash when receiving a HSPOST command with an empty body.
Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
- Do not crash when receiving a POSTDESCRIPTOR command with an empty
body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
o Minor bugfixes (file limits, osx, backport from 0.3.1.5-alpha):
- When setting the maximum number of connections allowed by the OS,
always allow some extra file descriptors for other files. Fixes
bug 22797; bugfix on 0.2.0.10-alpha.
o Minor bugfixes (logging, relay, backport from 0.3.1.6-rc):
- Remove a forgotten debugging message when an introduction point
successfully establishes a hidden service prop224 circuit with
a client.
- Change three other log_warn() for an introduction point to
protocol warnings, because they can be failure from the network
and are not relevant to the operator. Fixes bug 23078; bugfix on
0.3.0.1-alpha and 0.3.0.2-alpha.
Changes in version 0.3.1.7 - 2017-09-18
Tor 0.3.1.7 is the first stable release in the 0.3.1 series.
With the 0.3.1 series, Tor now serves and downloads directory
information in more compact formats, to save on bandwidth overhead. It
also contains a new padding system to resist netflow-based traffic
analysis, and experimental support for building parts of Tor in Rust
(though no parts of Tor are in Rust yet). There are also numerous
small features, bugfixes on earlier release series, and groundwork for
the hidden services revamp of 0.3.2.
This release also includes a fix for TROVE-2017-008, a security bug
that affects hidden services running with the SafeLogging option
disabled. For more information, see
https://trac.torproject.org/projects/tor/ticket/23490
Per our stable release policy, we plan to support each stable release
series for at least the next nine months, or for three months after
the first stable release of the next series: whichever is longer. If
you need a release with long-term support, we recommend that you stay
with the 0.2.9 series.
Below is a list of the changes since 0.3.1.6-rc. For a list of all
changes since 0.3.0, see the ReleaseNotes file.
o Major bugfixes (security, hidden services, loggging):
- Fix a bug where we could log uninitialized stack when a certain
hidden service error occurred while SafeLogging was disabled.
Fixes bug #23490; bugfix on 0.2.7.2-alpha. This is also tracked as
TROVE-2017-008 and CVE-2017-0380.
o Minor features (defensive programming):
- Create a pair of consensus parameters, nf_pad_tor2web and
nf_pad_single_onion, to disable netflow padding in the consensus
for non-anonymous connections in case the overhead is high. Closes
ticket 17857.
o Minor features (diagnostic):
- Add a stack trace to the bug warnings that can be logged when
trying to send an outgoing relay cell with n_chan == 0. Diagnostic
attempt for bug 23105.
o Minor features (geoip):
- Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (compilation):
- Avoid compiler warnings in the unit tests for calling tor_sscanf()
with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
o Minor bugfixes (controller):
- Do not crash when receiving a HSPOST command with an empty body.
Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
- Do not crash when receiving a POSTDESCRIPTOR command with an empty
body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
o Minor bugfixes (relay):
- Inform the geoip and rephist modules about all requests, even on
relays that are only fetching microdescriptors. Fixes a bug
related to 21585; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (unit tests):
- Fix a channelpadding unit test failure on slow systems by using
mocked time instead of actual time. Fixes bug 23077; bugfix
on 0.3.1.1-alpha.
Changes in version 0.3.1.6-rc - 2017-09-05
Tor 0.3.1.6-rc fixes a few small bugs and annoyances in the 0.3.1
release series, including a bug that produced weird behavior on
Windows directory caches.
This is the first release candidate in the Tor 0.3.1 series. If we
find no new bugs or regressions here, the first stable 0.3.1 release
will be nearly identical to it.
o Major bugfixes (windows, directory cache):
- On Windows, do not try to delete cached consensus documents and
diffs before they are unmapped from memory--Windows won't allow
that. Instead, allow the consensus cache directory to grow larger,
to hold files that might need to stay around longer. Fixes bug
22752; bugfix on 0.3.1.1-alpha.
o Minor features (directory authority):
- Improve the message that authorities report to relays that present
RSA/Ed25519 keypairs that conflict with previously pinned keys.
Closes ticket 22348.
o Minor features (geoip):
- Update geoip and geoip6 to the August 3 2017 Maxmind GeoLite2
Country database.
o Minor features (testing):
- Add more tests for compression backend initialization. Closes
ticket 22286.
o Minor bugfixes (directory cache):
- Fix a memory leak when recovering space in the consensus cache.
Fixes bug 23139; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (hidden service):
- Increase the number of circuits that a service is allowed to
open over a specific period of time. The value was lower than it
should be (8 vs 12) in the normal case of 3 introduction points.
Fixes bug 22159; bugfix on 0.3.0.5-rc.
- Fix a BUG warning during HSv3 descriptor decoding that could be
cause by a specially crafted descriptor. Fixes bug 23233; bugfix
on 0.3.0.1-alpha. Bug found by "haxxpop".
- Rate-limit the log messages if we exceed the maximum number of
allowed intro circuits. Fixes bug 22159; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (logging, relay):
- Remove a forgotten debugging message when an introduction point
successfully establishes a hidden service prop224 circuit with
a client.
- Change three other log_warn() for an introduction point to
protocol warnings, because they can be failure from the network
and are not relevant to the operator. Fixes bug 23078; bugfix on
0.3.0.1-alpha and 0.3.0.2-alpha.
o Minor bugfixes (relay):
- When a relay is not running as a directory cache, it will no
longer generate compressed consensuses and consensus diff
information. Previously, this was a waste of disk and CPU. Fixes
bug 23275; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (robustness, error handling):
- Improve our handling of the cases where OpenSSL encounters a
memory error while encoding keys and certificates. We haven't
observed these errors in the wild, but if they do happen, we now
detect and respond better. Fixes bug 19418; bugfix on all versions
of Tor. Reported by Guido Vranken.
o Minor bugfixes (stability):
- Avoid crashing on a double-free when unable to load or process an
included file. Fixes bug 23155; bugfix on 0.3.1.1-alpha. Found
with the clang static analyzer.
o Minor bugfixes (testing):
- Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
- Port the hs_ntor handshake test to work correctly with recent
versions of the pysha3 module. Fixes bug 23071; bugfix
on 0.3.1.1-alpha.
o Minor bugfixes (Windows service):
- When running as a Windows service, set the ID of the main thread
correctly. Failure to do so made us fail to send log messages to
the controller in 0.2.1.16-rc, slowed down controller event
delivery in 0.2.7.3-rc and later, and crash with an assertion
failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
Patch and diagnosis from "Vort".
Changes in version 0.3.0.10 - 2017-08-02
Tor 0.3.0.10 backports a collection of small-to-medium bugfixes
from the current Tor alpha series. OpenBSD users and TPROXY users
should upgrade; others are probably okay sticking with 0.3.0.9.
o Major features (build system, continuous integration, backport from 0.3.1.5-alpha):
- Tor's repository now includes a Travis Continuous Integration (CI)
configuration file (.travis.yml). This is meant to help new
developers and contributors who fork Tor to a Github repository be
better able to test their changes, and understand what we expect
to pass. To use this new build feature, you must fork Tor to your
Github account, then go into the "Integrations" menu in the
repository settings for your fork and enable Travis, then push
your changes. Closes ticket 22636.
o Major bugfixes (linux TPROXY support, backport from 0.3.1.1-alpha):
- Fix a typo that had prevented TPROXY-based transparent proxying
from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
Patch from "d4fq0fQAgoJ".
o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
- Avoid an assertion failure bug affecting our implementation of
inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
handling of "0xbar" differs from what we had expected. Fixes bug
22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
o Minor features (backport from 0.3.1.5-alpha):
- Update geoip and geoip6 to the July 4 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (bandwidth accounting, backport from 0.3.1.2-alpha):
- Roll over monthly accounting at the configured hour and minute,
rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
Found by Andrey Karpov with PVS-Studio.
o Minor bugfixes (compilation warnings, backport from 0.3.1.5-alpha):
- Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug 22915;
bugfix on 0.2.8.1-alpha.
- Fix warnings when building with libscrypt and openssl scrypt
support on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
- When building with certain versions of the mingw C header files,
avoid float-conversion warnings when calling the C functions
isfinite(), isnan(), and signbit(). Fixes bug 22801; bugfix
on 0.2.8.1-alpha.
o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
- Backport a fix for an "unused variable" warning that appeared
in some versions of mingw. Fixes bug 22838; bugfix on
0.2.8.1-alpha.
o Minor bugfixes (coverity build support, backport from 0.3.1.5-alpha):
- Avoid Coverity build warnings related to our BUG() macro. By
default, Coverity treats BUG() as the Linux kernel does: an
instant abort(). We need to override that so our BUG() macro
doesn't prevent Coverity from analyzing functions that use it.
Fixes bug 23030; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (directory authority, backport from 0.3.1.1-alpha):
- When rejecting a router descriptor for running an obsolete version
of Tor without ntor support, warn about the obsolete tor version,
not the missing ntor key. Fixes bug 20270; bugfix on 0.2.9.3-alpha.
o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.5-alpha):
- Avoid a sandbox failure when trying to re-bind to a socket and
mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (unit tests, backport from 0.3.1.5-alpha)
- Fix a memory leak in the link-handshake/certs_ok_ed25519 test.
Fixes bug 22803; bugfix on 0.3.0.1-alpha.
Changes in version 0.3.1.5-alpha - 2017-08-01
Tor 0.3.1.5-alpha improves the performance of consensus diff
calculation, fixes a crash bug on older versions of OpenBSD, and fixes
several other bugs. If no serious bugs are found in this version, the
next version will be a release candidate.
This release also marks the end of support for the Tor 0.2.4.x,
0.2.6.x, and 0.2.7.x release series. Those releases will receive no
further bug or security fixes. Anyone still running or distributing
one of those versions should upgrade.
o Major features (build system, continuous integration):
- Tor's repository now includes a Travis Continuous Integration (CI)
configuration file (.travis.yml). This is meant to help new
developers and contributors who fork Tor to a Github repository be
better able to test their changes, and understand what we expect
to pass. To use this new build feature, you must fork Tor to your
Github account, then go into the "Integrations" menu in the
repository settings for your fork and enable Travis, then push
your changes. Closes ticket 22636.
o Major bugfixes (openbsd, denial-of-service):
- Avoid an assertion failure bug affecting our implementation of
inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
handling of "0xbar" differs from what we had expected. Fixes bug
22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
o Major bugfixes (relay, performance):
- Perform circuit handshake operations at a higher priority than we
use for consensus diff creation and compression. This should
prevent circuits from starving when a relay or bridge receives a
new consensus, especially on lower-powered machines. Fixes bug
22883; bugfix on 0.3.1.1-alpha.
o Minor features (bridge authority):
- Add "fingerprint" lines to the networkstatus-bridges file produced
by bridge authorities. Closes ticket 22207.
o Minor features (directory cache, consensus diff):
- Add a new MaxConsensusAgeForDiffs option to allow directory cache
operators with low-resource environments to adjust the number of
consensuses they'll store and generate diffs from. Most cache
operators should leave it unchanged. Helps to work around
bug 22883.
o Minor features (geoip):
- Update geoip and geoip6 to the July 4 2017 Maxmind GeoLite2
Country database.
o Minor features (relay, performance):
- Always start relays with at least two worker threads, to prevent
priority inversion on slow tasks. Part of the fix for bug 22883.
- Allow background work to be queued with different priorities, so
that a big pile of slow low-priority jobs will not starve out
higher priority jobs. This lays the groundwork for a fix for
bug 22883.
o Minor bugfixes (build system, rust):
- Fix a problem where Rust toolchains were not being found when
building without --enable-cargo-online-mode, due to setting the
$HOME environment variable instead of $CARGO_HOME. Fixes bug
22830; bugfix on 0.3.1.1-alpha. Fix by Chelsea Komlo.
o Minor bugfixes (compatibility, zstd):
- Write zstd epilogues correctly when the epilogue requires
reallocation of the output buffer, even with zstd 1.3.0.
(Previously, we worked on 1.2.0 and failed with 1.3.0). Fixes bug
22927; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (compilation warnings):
- Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug
22915; bugfix on 0.2.8.1-alpha.
- Fix warnings when building with libscrypt and openssl scrypt
support on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
- Compile correctly when both openssl 1.1.0 and libscrypt are
detected. Previously this would cause an error. Fixes bug 22892;
bugfix on 0.3.1.1-alpha.
- When building with certain versions of the mingw C header files,
avoid float-conversion warnings when calling the C functions
isfinite(), isnan(), and signbit(). Fixes bug 22801; bugfix
on 0.2.8.1-alpha.
o Minor bugfixes (coverity build support):
- Avoid Coverity build warnings related to our BUG() macro. By
default, Coverity treats BUG() as the Linux kernel does: an
instant abort(). We need to override that so our BUG() macro
doesn't prevent Coverity from analyzing functions that use it.
Fixes bug 23030; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (directory authority):
- When a directory authority rejects a descriptor or extrainfo with
a given digest, mark that digest as undownloadable, so that we do
not attempt to download it again over and over. We previously
tried to avoid downloading such descriptors by other means, but we
didn't notice if we accidentally downloaded one anyway. This
behavior became problematic in 0.2.7.2-alpha, when authorities
began pinning Ed25519 keys. Fixes bug 22349; bugfix
on 0.2.1.19-alpha.
o Minor bugfixes (error reporting, windows):
- When formatting Windows error messages, use the English format to
avoid codepage issues. Fixes bug 22520; bugfix on 0.1.2.8-alpha.
Patch from "Vort".
o Minor bugfixes (file limits, osx):
- When setting the maximum number of connections allowed by the OS,
always allow some extra file descriptors for other files. Fixes
bug 22797; bugfix on 0.2.0.10-alpha.
o Minor bugfixes (linux seccomp2 sandbox):
- Avoid a sandbox failure when trying to re-bind to a socket and
mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (memory leaks):
- Fix a small memory leak when validating a configuration that uses
two or more AF_UNIX sockets for the same port type. Fixes bug
23053; bugfix on 0.2.6.3-alpha. This is CID 1415725.
o Minor bugfixes (unit tests):
- test_consdiff_base64cmp would fail on OS X because while OS X
follows the standard of (less than zero/zero/greater than zero),
it doesn't follow the convention of (-1/0/+1). Make the test
comply with the standard. Fixes bug 22870; bugfix on 0.3.1.1-alpha.
- Fix a memory leak in the link-handshake/certs_ok_ed25519 test.
Fixes bug 22803; bugfix on 0.3.0.1-alpha.
Changes in version 0.3.1.4-alpha - 2017-06-29
Tor 0.3.1.4-alpha fixes a path selection bug that would allow a client
to use a guard that was in the same network family as a chosen exit
relay. This is a security regression; all clients running earlier
versions of 0.3.0.x or 0.3.1.x should upgrade to 0.3.0.9
or 0.3.1.4-alpha.
This release also fixes several other bugs introduced in 0.3.0.x
and 0.3.1.x, including others that can affect bandwidth usage
and correctness.
o New dependencies:
- To build with zstd and lzma support, Tor now requires the
pkg-config tool at build time. (This requirement was new in
0.3.1.1-alpha, but was not noted at the time. Noting it here to
close ticket 22623.)
o Major bugfixes (path selection, security):
- When choosing which guard to use for a circuit, avoid the exit's
family along with the exit itself. Previously, the new guard
selection logic avoided the exit, but did not consider its family.
Fixes bug 22753; bugfix on 0.3.0.1-alpha. Tracked as TROVE-2017-
006 and CVE-2017-0377.
o Major bugfixes (compression, zstd):
- Correctly detect a full buffer when decompressing a large zstd-
compressed input. Previously, we would sometimes treat a full
buffer as an error. Fixes bug 22628; bugfix on 0.3.1.1-alpha.
o Major bugfixes (directory protocol):
- Ensure that we send "304 Not modified" as HTTP status code when a
client is attempting to fetch a consensus or consensus diff, and
the best one we can send them is one they already have. Fixes bug
22702; bugfix on 0.3.1.1-alpha.
o Major bugfixes (entry guards):
- When starting with an old consensus, do not add new entry guards
unless the consensus is "reasonably live" (under 1 day old). Fixes
one root cause of bug 22400; bugfix on 0.3.0.1-alpha.
o Minor features (bug mitigation, diagnostics, logging):
- Avoid an assertion failure, and log a better error message, when
unable to remove a file from the consensus cache on Windows.
Attempts to mitigate and diagnose bug 22752.
o Minor features (geoip):
- Update geoip and geoip6 to the June 8 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (compression):
- When compressing or decompressing a buffer, check for a failure to
create a compression object. Fixes bug 22626; bugfix
on 0.3.1.1-alpha.
- When decompressing a buffer, check for extra data after the end of
the compressed data. Fixes bug 22629; bugfix on 0.3.1.1-alpha.
- When decompressing an object received over an anonymous directory
connection, if we have already decompressed it using an acceptable
compression method, do not reject it for looking like an
unacceptable compression method. Fixes part of bug 22670; bugfix
on 0.3.1.1-alpha.
- When serving directory votes compressed with zlib, do not claim to
have compressed them with zstd. Fixes bug 22669; bugfix
on 0.3.1.1-alpha.
- When spooling compressed data to an output buffer, don't try to
spool more data when there is no more data to spool and we are not
trying to flush the input. Previously, we would sometimes launch
compression requests with nothing to do, which interferes with our
22672 checks. Fixes bug 22719; bugfix on 0.2.0.16-alpha.
o Minor bugfixes (defensive programming):
- Detect and break out of infinite loops in our compression code. We
don't think that any such loops exist now, but it's best to be
safe. Closes ticket 22672.
- Fix a memset() off the end of an array when packing cells. This
bug should be harmless in practice, since the corrupted bytes are
still in the same structure, and are always padding bytes,
ignored, or immediately overwritten, depending on compiler
behavior. Nevertheless, because the memset()'s purpose is to make
sure that any other cell-handling bugs can't expose bytes to the
network, we need to fix it. Fixes bug 22737; bugfix on
0.2.4.11-alpha. Fixes CID 1401591.
o Minor bugfixes (linux seccomp2 sandbox):
- Permit the fchmod system call, to avoid crashing on startup when
starting with the seccomp2 sandbox and an unexpected set of
permissions on the data directory or its contents. Fixes bug
22516; bugfix on 0.2.5.4-alpha.
- Fix a crash in the LZMA module, when the sandbox was enabled, and
liblzma would allocate more than 16 MB of memory. We solve this by
bumping the mprotect() limit in the sandbox module from 16 MB to
20 MB. Fixes bug 22751; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (logging):
- When decompressing, do not warn if we fail to decompress using a
compression method that we merely guessed. Fixes part of bug
22670; bugfix on 0.1.1.14-alpha.
- When decompressing, treat mismatch between content-encoding and
actual compression type as a protocol warning. Fixes part of bug
22670; bugfix on 0.1.1.9-alpha.
- Downgrade "assigned_to_cpuworker failed" message to info-level
severity. In every case that can reach it, either a better warning
has already been logged, or no warning is warranted. Fixes bug
22356; bugfix on 0.2.6.3-alpha.
- Demote a warn that was caused by libevent delays to info if
netflow padding is less than 4.5 seconds late, or to notice
if it is more (4.5 seconds is the amount of time that a netflow
record might be emitted after, if we chose the maximum timeout).
Fixes bug 22212; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (process behavior):
- When exiting because of an error, always exit with a nonzero exit
status. Previously, we would fail to report an error in our exit
status in cases related to __OwningControllerProcess failure,
lockfile contention, and Ed25519 key initialization. Fixes bug
22720; bugfix on versions 0.2.1.6-alpha, 0.2.2.28-beta, and
0.2.7.2-alpha respectively. Reported by "f55jwk4f"; patch
from "huyvq".
o Documentation:
- Add a manpage description for the key-pinning-journal file. Closes
ticket 22347.
- Correctly note that bandwidth accounting values are stored in the
state file, and the bw_accounting file is now obsolete. Closes
ticket 16082.
- Document more of the files in the Tor data directory, including
cached-extrainfo, secret_onion_key{,_ntor}.old, hidserv-stats,
approved-routers, sr-random, and diff-cache. Found while fixing
ticket 22347.
Changes in version 0.3.0.9 - 2017-06-29
Tor 0.3.0.9 fixes a path selection bug that would allow a client
to use a guard that was in the same network family as a chosen exit
relay. This is a security regression; all clients running earlier
versions of 0.3.0.x or 0.3.1.x should upgrade to 0.3.0.9 or
0.3.1.4-alpha.
This release also backports several other bugfixes from the 0.3.1.x
series.
o Major bugfixes (path selection, security, backport from 0.3.1.4-alpha):
- When choosing which guard to use for a circuit, avoid the exit's
family along with the exit itself. Previously, the new guard
selection logic avoided the exit, but did not consider its family.
Fixes bug 22753; bugfix on 0.3.0.1-alpha. Tracked as TROVE-2017-
006 and CVE-2017-0377.
o Major bugfixes (entry guards, backport from 0.3.1.1-alpha):
- Don't block bootstrapping when a primary bridge is offline and we
can't get its descriptor. Fixes bug 22325; fixes one case of bug
21969; bugfix on 0.3.0.3-alpha.
o Major bugfixes (entry guards, backport from 0.3.1.4-alpha):
- When starting with an old consensus, do not add new entry guards
unless the consensus is "reasonably live" (under 1 day old). Fixes
one root cause of bug 22400; bugfix on 0.3.0.1-alpha.
o Minor features (geoip):
- Update geoip and geoip6 to the June 8 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (voting consistency, backport from 0.3.1.1-alpha):
- Reject version numbers with non-numeric prefixes (such as +, -, or
whitespace). Disallowing whitespace prevents differential version
parsing between POSIX-based and Windows platforms. Fixes bug 21507
and part of 21508; bugfix on 0.0.8pre1.
o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.4-alpha):
- Permit the fchmod system call, to avoid crashing on startup when
starting with the seccomp2 sandbox and an unexpected set of
permissions on the data directory or its contents. Fixes bug
22516; bugfix on 0.2.5.4-alpha.
o Minor bugfixes (defensive programming, backport from 0.3.1.4-alpha):
- Fix a memset() off the end of an array when packing cells. This
bug should be harmless in practice, since the corrupted bytes are
still in the same structure, and are always padding bytes,
ignored, or immediately overwritten, depending on compiler
behavior. Nevertheless, because the memset()'s purpose is to make
sure that any other cell-handling bugs can't expose bytes to the
network, we need to fix it. Fixes bug 22737; bugfix on
0.2.4.11-alpha. Fixes CID 1401591.
Changes in version 0.3.1.3-alpha - 2017-06-08
Tor 0.3.1.3-alpha fixes a pair of bugs that would allow an attacker to
remotely crash a hidden service with an assertion failure. Anyone
running a hidden service should upgrade to this version, or to some
other version with fixes for TROVE-2017-004 and TROVE-2017-005.
Tor 0.3.1.3-alpha also includes fixes for several key management bugs
that sometimes made relays unreliable, as well as several other
bugfixes described below.
o Major bugfixes (hidden service, relay, security):
- Fix a remotely triggerable assertion failure when a hidden service
handles a malformed BEGIN cell. Fixes bug 22493, tracked as
TROVE-2017-004 and as CVE-2017-0375; bugfix on 0.3.0.1-alpha.
- Fix a remotely triggerable assertion failure caused by receiving a
BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
on 0.2.2.1-alpha.
o Major bugfixes (relay, link handshake):
- When performing the v3 link handshake on a TLS connection, report
that we have the x509 certificate that we actually used on that
connection, even if we have changed certificates since that
connection was first opened. Previously, we would claim to have
used our most recent x509 link certificate, which would sometimes
make the link handshake fail. Fixes one case of bug 22460; bugfix
on 0.2.3.6-alpha.
o Major bugfixes (relays, key management):
- Regenerate link and authentication certificates whenever the key
that signs them changes; also, regenerate link certificates
whenever the signed key changes. Previously, these processes were
only weakly coupled, and we relays could (for minutes to hours)
wind up with an inconsistent set of keys and certificates, which
other relays would not accept. Fixes two cases of bug 22460;
bugfix on 0.3.0.1-alpha.
- When sending an Ed25519 signing->link certificate in a CERTS cell,
send the certificate that matches the x509 certificate that we
used on the TLS connection. Previously, there was a race condition
if the TLS context rotated after we began the TLS handshake but
before we sent the CERTS cell. Fixes a case of bug 22460; bugfix
on 0.3.0.1-alpha.
o Major bugfixes (torrc, crash):
- Fix a crash bug when using %include in torrc. Fixes bug 22417;
bugfix on 0.3.1.1-alpha. Patch by Daniel Pinto.
o Minor features (code style):
- Add "Falls through" comments to our codebase, in order to silence
GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
Stieger. Closes ticket 22446.
o Minor features (diagnostic):
- Add logging messages to try to diagnose a rare bug that seems to
generate RSA->Ed25519 cross-certificates dated in the 1970s. We
think this is happening because of incorrect system clocks, but
we'd like to know for certain. Diagnostic for bug 22466.
o Minor bugfixes (correctness):
- Avoid undefined behavior when parsing IPv6 entries from the geoip6
file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
o Minor bugfixes (directory protocol):
- Check for libzstd >= 1.1, because older versions lack the
necessary streaming API. Fixes bug 22413; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (link handshake):
- Lower the lifetime of the RSA->Ed25519 cross-certificate to six
months, and regenerate it when it is within one month of expiring.
Previously, we had generated this certificate at startup with a
ten-year lifetime, but that could lead to weird behavior when Tor
was started with a grossly inaccurate clock. Mitigates bug 22466;
mitigation on 0.3.0.1-alpha.
o Minor bugfixes (storage directories):
- Always check for underflows in the cached storage directory usage.
If the usage does underflow, re-calculate it. Also, avoid a
separate underflow when the usage is not known. Fixes bug 22424;
bugfix on 0.3.1.1-alpha.
o Minor bugfixes (unit tests):
- The unit tests now pass on systems where localhost is misconfigured
to some IPv4 address other than 127.0.0.1. Fixes bug 6298; bugfix
on 0.0.9pre2.
o Documentation:
- Clarify the manpage for the (deprecated) torify script. Closes
ticket 6892.
Changes in version 0.3.0.8 - 2017-06-08
Tor 0.3.0.8 fixes a pair of bugs that would allow an attacker to
remotely crash a hidden service with an assertion failure. Anyone
running a hidden service should upgrade to this version, or to some
other version with fixes for TROVE-2017-004 and TROVE-2017-005.
Tor 0.3.0.8 also includes fixes for several key management bugs
that sometimes made relays unreliable, as well as several other
bugfixes described below.
o Major bugfixes (hidden service, relay, security, backport
from 0.3.1.3-alpha):
- Fix a remotely triggerable assertion failure when a hidden service
handles a malformed BEGIN cell. Fixes bug 22493, tracked as
TROVE-2017-004 and as CVE-2017-0375; bugfix on 0.3.0.1-alpha.
- Fix a remotely triggerable assertion failure caused by receiving a
BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
on 0.2.2.1-alpha.
o Major bugfixes (relay, link handshake, backport from 0.3.1.3-alpha):
- When performing the v3 link handshake on a TLS connection, report
that we have the x509 certificate that we actually used on that
connection, even if we have changed certificates since that
connection was first opened. Previously, we would claim to have
used our most recent x509 link certificate, which would sometimes
make the link handshake fail. Fixes one case of bug 22460; bugfix
on 0.2.3.6-alpha.
o Major bugfixes (relays, key management, backport from 0.3.1.3-alpha):
- Regenerate link and authentication certificates whenever the key
that signs them changes; also, regenerate link certificates
whenever the signed key changes. Previously, these processes were
only weakly coupled, and we relays could (for minutes to hours)
wind up with an inconsistent set of keys and certificates, which
other relays would not accept. Fixes two cases of bug 22460;
bugfix on 0.3.0.1-alpha.
- When sending an Ed25519 signing->link certificate in a CERTS cell,
send the certificate that matches the x509 certificate that we
used on the TLS connection. Previously, there was a race condition
if the TLS context rotated after we began the TLS handshake but
before we sent the CERTS cell. Fixes a case of bug 22460; bugfix
on 0.3.0.1-alpha.
o Major bugfixes (hidden service v3, backport from 0.3.1.1-alpha):
- Stop rejecting v3 hidden service descriptors because their size
did not match an old padding rule. Fixes bug 22447; bugfix on
0.3.0.1-alpha.
o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
- Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
December 2016 (of which ~126 were still functional) with a list of
151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
2017. Resolves ticket 21564.
o Minor bugfixes (configuration, backport from 0.3.1.1-alpha):
- Do not crash when starting with LearnCircuitBuildTimeout 0. Fixes
bug 22252; bugfix on 0.2.9.3-alpha.
o Minor bugfixes (correctness, backport from 0.3.1.3-alpha):
- Avoid undefined behavior when parsing IPv6 entries from the geoip6
file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
o Minor bugfixes (link handshake, backport from 0.3.1.3-alpha):
- Lower the lifetime of the RSA->Ed25519 cross-certificate to six
months, and regenerate it when it is within one month of expiring.
Previously, we had generated this certificate at startup with a
ten-year lifetime, but that could lead to weird behavior when Tor
was started with a grossly inaccurate clock. Mitigates bug 22466;
mitigation on 0.3.0.1-alpha.
o Minor bugfixes (memory leak, directory authority, backport from
0.3.1.2-alpha):
- When directory authorities reject a router descriptor due to
keypinning, free the router descriptor rather than leaking the
memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
Changes in version 0.2.9.11 - 2017-06-08
Tor 0.2.9.11 backports a fix for a bug that would allow an attacker to
remotely crash a hidden service with an assertion failure. Anyone
running a hidden service should upgrade to this version, or to some
other version with fixes for TROVE-2017-005. (Versions before 0.3.0
are not affected by TROVE-2017-004.)
Tor 0.2.9.11 also backports fixes for several key management bugs
that sometimes made relays unreliable, as well as several other
bugfixes described below.
o Major bugfixes (hidden service, relay, security, backport
from 0.3.1.3-alpha):
- Fix a remotely triggerable assertion failure caused by receiving a
BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
on 0.2.2.1-alpha.
o Major bugfixes (relay, link handshake, backport from 0.3.1.3-alpha):
- When performing the v3 link handshake on a TLS connection, report
that we have the x509 certificate that we actually used on that
connection, even if we have changed certificates since that
connection was first opened. Previously, we would claim to have
used our most recent x509 link certificate, which would sometimes
make the link handshake fail. Fixes one case of bug 22460; bugfix
on 0.2.3.6-alpha.
o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
- Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
December 2016 (of which ~126 were still functional) with a list of
151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
2017. Resolves ticket 21564.
o Minor features (future-proofing, backport from 0.3.0.7):
- Tor no longer refuses to download microdescriptors or descriptors if
they are listed as "published in the future". This change will
eventually allow us to stop listing meaningful "published" dates
in microdescriptor consensuses, and thereby allow us to reduce the
resources required to download consensus diffs by over 50%.
Implements part of ticket 21642; implements part of proposal 275.
o Minor features (directory authorities, backport from 0.3.0.4-rc)
- Directory authorities now reject relays running versions
0.2.9.1-alpha through 0.2.9.4-alpha, because those relays
suffer from bug 20499 and don't keep their consensus cache
up-to-date. Resolves ticket 20509.
o Minor features (geoip):
- Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (control port, backport from 0.3.0.6):
- The GETINFO extra-info/digest/<digest> command was broken because
of a wrong base16 decode return value check, introduced when
refactoring that API. Fixes bug 22034; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (correctness, backport from 0.3.1.3-alpha):
- Avoid undefined behavior when parsing IPv6 entries from the geoip6
file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.0.7):
- The getpid() system call is now permitted under the Linux seccomp2
sandbox, to avoid crashing with versions of OpenSSL (and other
libraries) that attempt to learn the process's PID by using the
syscall rather than the VDSO code. Fixes bug 21943; bugfix
on 0.2.5.1-alpha.
o Minor bugfixes (memory leak, directory authority, backport
from 0.3.1.2-alpha):
- When directory authorities reject a router descriptor due to
keypinning, free the router descriptor rather than leaking the
memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
Changes in version 0.2.8.14 - 2017-06-08
Tor 0.2.7.8 backports a fix for a bug that would allow an attacker to
remotely crash a hidden service with an assertion failure. Anyone
running a hidden service should upgrade to this version, or to some
other version with fixes for TROVE-2017-005. (Versions before 0.3.0
are not affected by TROVE-2017-004.)
o Major bugfixes (hidden service, relay, security):
- Fix a remotely triggerable assertion failure caused by receiving a
BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
on 0.2.2.1-alpha.
o Minor features (geoip):
- Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
Country database.
o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
- Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
December 2016 (of which ~126 were still functional) with a list of
151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
2017. Resolves ticket 21564.
o Minor bugfixes (correctness):
- Avoid undefined behavior when parsing IPv6 entries from the geoip6
file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
Changes in version 0.2.7.8 - 2017-06-08
Tor 0.2.7.8 backports a fix for a bug that would allow an attacker to
remotely crash a hidden service with an assertion failure. Anyone
running a hidden service should upgrade to this version, or to some
other version with fixes for TROVE-2017-005. (Versions before 0.3.0
are not affected by TROVE-2017-004.)
o Major bugfixes (hidden service, relay, security):
- Fix a remotely triggerable assertion failure caused by receiving a
BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
on 0.2.2.1-alpha.
o Minor features (geoip):
- Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (correctness):
- Avoid undefined behavior when parsing IPv6 entries from the geoip6
file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
Changes in version 0.2.6.12 - 2017-06-08
Tor 0.2.6.12 backports a fix for a bug that would allow an attacker to
remotely crash a hidden service with an assertion failure. Anyone
running a hidden service should upgrade to this version, or to some
other version with fixes for TROVE-2017-005. (Versions before 0.3.0
are not affected by TROVE-2017-004.)
o Major bugfixes (hidden service, relay, security):
- Fix a remotely triggerable assertion failure caused by receiving a
BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
on 0.2.2.1-alpha.
o Minor features (geoip):
- Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (correctness):
- Avoid undefined behavior when parsing IPv6 entries from the geoip6
file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
Changes in version 0.2.5.14 - 2017-06-08
Tor 0.2.5.14 backports a fix for a bug that would allow an attacker to
remotely crash a hidden service with an assertion failure. Anyone
running a hidden service should upgrade to this version, or to some
other version with fixes for TROVE-2017-005. (Versions before 0.3.0
are not affected by TROVE-2017-004.)
o Major bugfixes (hidden service, relay, security):
- Fix a remotely triggerable assertion failure caused by receiving a
BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
on 0.2.2.1-alpha.
o Minor features (geoip):
- Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (correctness):
- Avoid undefined behavior when parsing IPv6 entries from the geoip6
file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
Changes in version 0.2.4.29 - 2017-06-08
Tor 0.2.4.29 backports a fix for a bug that would allow an attacker to
remotely crash a hidden service with an assertion failure. Anyone
running a hidden service should upgrade to this version, or to some
other version with fixes for TROVE-2017-005. (Versions before 0.3.0
are not affected by TROVE-2017-004.)
o Major bugfixes (hidden service, relay, security):
- Fix a remotely triggerable assertion failure caused by receiving a
BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
on 0.2.2.1-alpha.
o Minor features (geoip):
- Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (correctness):
- Avoid undefined behavior when parsing IPv6 entries from the geoip6
file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
Changes in version 0.3.1.2-alpha - 2017-05-26
Tor 0.3.1.2-alpha is the second release in the 0.3.1.x series. It
fixes a few bugs found while testing 0.3.1.1-alpha, including a
memory corruption bug that affected relay stability.
o Major bugfixes (crash, relay):
- Fix a memory-corruption bug in relays that set MyFamily.
Previously, they would double-free MyFamily elements when making
the next descriptor or when changing their configuration. Fixes
bug 22368; bugfix on 0.3.1.1-alpha.
o Minor bugfixes (logging):
- Log a better message when a directory authority replies to an
upload with an unexpected status code. Fixes bug 11121; bugfix
on 0.1.0.1-rc.
o Minor bugfixes (memory leak, directory authority):
- When directory authorities reject a router descriptor due to
keypinning, free the router descriptor rather than leaking the
memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
Changes in version 0.3.1.1-alpha - 2017-05-22
Tor 0.3.1.1-alpha is the first release in the 0.3.1.x series. It
reduces the bandwidth usage for Tor's directory protocol, adds some
basic padding to resist netflow-based traffic analysis and to serve as
the basis of other padding in the future, and adds rust support to the
build system.
It also contains numerous other small features and improvements to
security, correctness, and performance.
Below are the changes since 0.3.0.7.
o Major features (directory protocol):
- Tor relays and authorities can now serve clients an abbreviated
version of the consensus document, containing only the changes
since an older consensus document that the client holds. Clients
now request these documents when available. When both client and
server use this new protocol, they will use far less bandwidth (up
to 94% less) to keep the client's consensus up-to-date. Implements
proposal 140; closes ticket 13339. Based on work by Daniel Martí.
- Tor can now compress directory traffic with lzma or with zstd
compression algorithms, which can deliver better bandwidth
performance. Because lzma is computationally expensive, it's only
used for documents that can be compressed once and served many
times. Support for these algorithms requires that tor is built
with the libzstd and/or liblzma libraries available. Implements
proposal 278; closes ticket 21662.
- Relays now perform the more expensive compression operations, and
consensus diff generation, in worker threads. This separation
avoids delaying the main thread when a new consensus arrives.
o Major features (experimental):
- Tor can now build modules written in Rust. To turn this on, pass
the "--enable-rust" flag to the configure script. It's not time to
get excited yet: currently, there is no actual Rust functionality
beyond some simple glue code, and a notice at startup to tell you
that Rust is running. Still, we hope that programmers and
packagers will try building Tor with Rust support, so that we can
find issues and solve portability problems. Closes ticket 22106.
o Major features (traffic analysis resistance):
- Connections between clients and relays now send a padding cell in
each direction every 1.5 to 9.5 seconds (tunable via consensus
parameters). This padding will not resist specialized
eavesdroppers, but it should be enough to make many ISPs' routine
network flow logging less useful in traffic analysis against
Tor users.
Padding is negotiated using Tor's link protocol, so both relays
and clients must upgrade for this to take effect. Clients may
still send padding despite the relay's version by setting
ConnectionPadding 1 in torrc, and may disable padding by setting
ConnectionPadding 0 in torrc. Padding may be minimized for mobile
users with the torrc option ReducedConnectionPadding. Implements
Proposal 251 and Section 2 of Proposal 254; closes ticket 16861.
- Relays will publish 24 hour totals of padding and non-padding cell
counts to their extra-info descriptors, unless PaddingStatistics 0
is set in torrc. These 24 hour totals are also rounded to
multiples of 10000.
o Major bugfixes (connection usage):
- We use NETINFO cells to try to determine if both relays involved
in a connection will agree on the canonical status of that
connection. We prefer the connections where this is the case for
extend cells, and try to close connections where relays disagree
on their canonical status early. Also, we now prefer the oldest
valid connection for extend cells. These two changes should reduce
the number of long-term connections that are kept open between
relays. Fixes bug 17604; bugfix on 0.2.5.5-alpha.
- Relays now log hourly statistics (look for
"channel_check_for_duplicates" lines) on the total number of
connections to other relays. If the number of connections per
relay is unexpectedly large, this log message is at notice level.
Otherwise it is at info.
o Major bugfixes (entry guards):
- Don't block bootstrapping when a primary bridge is offline and we
can't get its descriptor. Fixes bug 22325; fixes one case of bug
21969; bugfix on 0.3.0.3-alpha.
o Major bugfixes (linux TPROXY support):
- Fix a typo that had prevented TPROXY-based transparent proxying
from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
Patch from "d4fq0fQAgoJ".
o Minor features (security, windows):
- Enable a couple of pieces of Windows hardening: one
(HeapEnableTerminationOnCorruption) that has been on-by-default
since Windows 8, and unavailable before Windows 7; and one
(PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
affect us, but shouldn't do any harm. Closes ticket 21953.
o Minor features (config options):
- Allow "%include" directives in torrc configuration files. These
directives import the settings from other files, or from all the
files in a directory. Closes ticket 1922. Code by Daniel Pinto.
- Make SAVECONF return an error when overwriting a torrc that has
includes. Using SAVECONF with the FORCE option will allow it to
overwrite torrc even if includes are used. Related to ticket 1922.
- Add "GETINFO config-can-saveconf" to tell controllers if SAVECONF
will work without the FORCE option. Related to ticket 1922.
o Minor features (controller):
- Warn the first time that a controller requests data in the long-
deprecated 'GETINFO network-status' format. Closes ticket 21703.
o Minor features (defaults):
- The default value for UseCreateFast is now 0: clients which
haven't yet received a consensus document will now use a proper
ntor handshake to talk to their directory servers whenever they
can. Closes ticket 21407.
- Onion key rotation and expiry intervals are now defined as a
network consensus parameter, per proposal 274. The default
lifetime of an onion key is increased from 7 to 28 days. Old onion
keys will expire after 7 days by default. This change will make
consensus diffs much smaller, and save significant bandwidth.
Closes ticket 21641.
o Minor features (fallback directory list):
- Update the fallback directory mirror whitelist and blacklist based
on operator emails. Closes task 21121.
- Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
December 2016 (of which ~126 were still functional) with a list of
151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
2017. Resolves ticket 21564.
o Minor features (hidden services, logging):
- Log a message when a hidden service descriptor has fewer
introduction points than specified in
HiddenServiceNumIntroductionPoints. Closes tickets 21598.
- Log a message when a hidden service reaches its introduction point
circuit limit, and when that limit is reset. Follow up to ticket
21594; closes ticket 21622.
- Warn user if multiple entries in EntryNodes and at least one
HiddenService are used together. Pinning EntryNodes along with a
hidden service can be possibly harmful; for instance see ticket
14917 or 21155. Closes ticket 21155.
o Minor features (linux seccomp2 sandbox):
- We now have a document storage backend compatible with the Linux
seccomp2 sandbox. This backend is used for consensus documents and
diffs between them; in the long term, we'd like to use it for
unparseable directory material too. Closes ticket 21645
- Increase the maximum allowed size passed to mprotect(PROT_WRITE)
from 1MB to 16MB. This was necessary with the glibc allocator in
order to allow worker threads to allocate more memory -- which in
turn is necessary because of our new use of worker threads for
compression. Closes ticket 22096.
o Minor features (logging):
- Log files are no longer created world-readable by default.
(Previously, most distributors would store the logs in a non-
world-readable location to prevent inappropriate access. This
change is an extra precaution.) Closes ticket 21729; patch
from toralf.
o Minor features (performance):
- Our Keccak (SHA-3) implementation now accesses memory more
efficiently, especially on little-endian systems. Closes
ticket 21737.
- Add an O(1) implementation of channel_find_by_global_id(), to
speed some controller functions.
o Minor features (relay, configuration):
- The MyFamily option may now be repeated as many times as desired,
for relays that want to configure large families. Closes ticket
4998; patch by Daniel Pinto.
o Minor features (safety):
- Add an explicit check to extrainfo_parse_entry_from_string() for
NULL inputs. We don't believe this can actually happen, but it may
help silence a warning from the Clang analyzer. Closes
ticket 21496.
o Minor features (testing):
- Add a "--disable-memory-sentinels" feature to help with fuzzing.
When Tor is compiled with this option, we disable a number of
redundant memory-safety failsafes that are intended to stop bugs
from becoming security issues. This makes it easier to hunt for
bugs that would be security issues without the failsafes turned
on. Closes ticket 21439.
- Add a general event-tracing instrumentation support to Tor. This
subsystem will enable developers and researchers to add fine-
grained instrumentation to their Tor instances, for use when
examining Tor network performance issues. There are no trace
events yet, and event-tracing is off by default unless enabled at
compile time. Implements ticket 13802.
- Improve our version parsing tests: add tests for typical version
components, add tests for invalid versions, including numeric
range and non-numeric prefixes. Unit tests 21278, 21450, and
21507. Partially implements 21470.
o Minor bugfixes (bandwidth accounting):
- Roll over monthly accounting at the configured hour and minute,
rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
Found by Andrey Karpov with PVS-Studio.
o Minor bugfixes (code correctness):
- Accurately identify client connections by their lack of peer
authentication. This means that we bail out earlier if asked to
extend to a client. Follow-up to 21407. Fixes bug 21406; bugfix
on 0.2.4.23.
o Minor bugfixes (configuration):
- Do not crash when starting with LearnCircuitBuildTimeout 0. Fixes
bug 22252; bugfix on 0.2.9.3-alpha.
o Minor bugfixes (connection lifespan):
- Allow more control over how long TLS connections are kept open:
unify CircuitIdleTimeout and PredictedPortsRelevanceTime into a
single option called CircuitsAvailableTimeout. Also, allow the
consensus to control the default values for both this preference
and the lifespan of relay-to-relay connections. Fixes bug 17592;
bugfix on 0.2.5.5-alpha.
- Increase the initial circuit build timeout testing frequency, to
help ensure that ReducedConnectionPadding clients finish learning
a timeout before their orconn would expire. The initial testing
rate was set back in the days of TAP and before the Tor Browser
updater, when we had to be much more careful about new clients
making lots of circuits. With this change, a circuit build timeout
is learned in about 15-20 minutes, instead of 100-120 minutes.
o Minor bugfixes (controller):
- GETINFO onions/current and onions/detached no longer respond with
551 on empty lists. Fixes bug 21329; bugfix on 0.2.7.1-alpha.
- Trigger HS descriptor events on the control port when the client
fails to pick a hidden service directory for a hidden service.
This can happen if all the hidden service directories are in
ExcludeNodes, or they have all been queried within the last 15
minutes. Fixes bug 22042; bugfix on 0.2.5.2-alpha.
o Minor bugfixes (directory authority):
- When rejecting a router descriptor for running an obsolete version
of Tor without ntor support, warn about the obsolete tor version,
not the missing ntor key. Fixes bug 20270; bugfix on 0.2.9.3-alpha.
- Prevent the shared randomness subsystem from asserting when
initialized by a bridge authority with an incomplete configuration
file. Fixes bug 21586; bugfix on 0.2.9.8.
o Minor bugfixes (exit-side DNS):
- Fix an untriggerable assertion that checked the output of a
libevent DNS error, so that the assertion actually behaves as
expected. Fixes bug 22244; bugfix on 0.2.0.20-rc. Found by Andrey
Karpov using PVS-Studio.
o Minor bugfixes (fallback directories):
- Make the usage example in updateFallbackDirs.py actually work, and
explain what it does. Fixes bug 22270; bugfix on 0.3.0.3-alpha.
- Decrease the guard flag average required to be a fallback. This
allows us to keep relays that have their guard flag removed when
they restart. Fixes bug 20913; bugfix on 0.2.8.1-alpha.
- Decrease the minimum number of fallbacks to 100. Fixes bug 20913;
bugfix on 0.2.8.1-alpha.
- Make sure fallback directory mirrors have the same address, port,
and relay identity key for at least 30 days before they are
selected. Fixes bug 20913; bugfix on 0.2.8.1-alpha.
o Minor bugfixes (hidden services):
- Stop printing a cryptic warning when a hidden service gets a
request to connect to a virtual port that it hasn't configured.
Fixes bug 16706; bugfix on 0.2.6.3-alpha.
- Simplify hidden service descriptor creation by using an existing
flag to check if an introduction point is established. Fixes bug
21599; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (memory leak):
- Fix a small memory leak at exit from the backtrace handler code.
Fixes bug 21788; bugfix on 0.2.5.2-alpha. Patch from Daniel Pinto.
o Minor bugfixes (protocol, logging):
- Downgrade a log statement about unexpected relay cells from "bug"
to "protocol warning", because there is at least one use case
where it can be triggered by a buggy tor implementation. Fixes bug
21293; bugfix on 0.1.1.14-alpha.
o Minor bugfixes (testing):
- Use unbuffered I/O for utility functions around the
process_handle_t type. This fixes unit test failures reported on
OpenBSD and FreeBSD. Fixes bug 21654; bugfix on 0.2.3.1-alpha.
- Make display of captured unit test log messages consistent. Fixes
bug 21510; bugfix on 0.2.9.3-alpha.
- Make test-network.sh always call chutney's test-network.sh.
Previously, this only worked on systems which had bash installed,
due to some bash-specific code in the script. Fixes bug 19699;
bugfix on 0.3.0.4-rc. Follow-up to ticket 21581.
o Minor bugfixes (voting consistency):
- Reject version numbers with non-numeric prefixes (such as +, -, or
whitespace). Disallowing whitespace prevents differential version
parsing between POSIX-based and Windows platforms. Fixes bug 21507
and part of 21508; bugfix on 0.0.8pre1.
o Minor bugfixes (windows, relay):
- Resolve "Failure from drain_fd: No error" warnings on Windows
relays. Fixes bug 21540; bugfix on 0.2.6.3-alpha.
o Code simplification and refactoring:
- Break up the 630-line function connection_dir_client_reached_eof()
into a dozen smaller functions. This change should help
maintainability and readability of the client directory code.
- Isolate our use of the openssl headers so that they are only
included from our crypto wrapper modules, and from tests that
examine those modules' internals. Closes ticket 21841.
- Simplify our API to launch directory requests, making it more
extensible and less error-prone. Now it's easier to add extra
headers to directory requests. Closes ticket 21646.
- Our base64 decoding functions no longer overestimate the output
space that they need when parsing unpadded inputs. Closes
ticket 17868.
- Remove unused "ROUTER_ADDED_NOTIFY_GENERATOR" internal value.
Resolves ticket 22213.
- The logic that directory caches use to spool request to clients,
serving them one part at a time so as not to allocate too much
memory, has been refactored for consistency. Previously there was
a separate spooling implementation per type of spoolable data. Now
there is one common spooling implementation, with extensible data
types. Closes ticket 21651.
- Tor's compression module now supports multiple backends. Part of
the implementation for proposal 278; closes ticket 21663.
o Documentation:
- Clarify the behavior of the KeepAliveIsolateSOCKSAuth sub-option.
Closes ticket 21873.
- Correct documentation about the default DataDirectory value.
Closes ticket 21151.
- Document the default behavior of NumEntryGuards and
NumDirectoryGuards correctly. Fixes bug 21715; bugfix
on 0.3.0.1-alpha.
- Document key=value pluggable transport arguments for Bridge lines
in torrc. Fixes bug 20341; bugfix on 0.2.5.1-alpha.
- Note that bandwidth-limiting options don't affect TCP headers or
DNS. Closes ticket 17170.
o Removed features (configuration options, all in ticket 22060):
- These configuration options are now marked Obsolete, and no longer
have any effect: AllowInvalidNodes, AllowSingleHopCircuits,
AllowSingleHopExits, ExcludeSingleHopRelays, FastFirstHopPK,
TLSECGroup, WarnUnsafeSocks. They were first marked as deprecated
in 0.2.9.2-alpha and have now been removed. The previous default
behavior is now always chosen; the previous (less secure) non-
default behavior is now unavailable.
- CloseHSClientCircuitsImmediatelyOnTimeout and
CloseHSServiceRendCircuitsImmediatelyOnTimeout were deprecated in
0.2.9.2-alpha and now have been removed. HS circuits never close
on circuit build timeout; they have a longer timeout period.
- {Control,DNS,Dir,Socks,Trans,NATD,OR}ListenAddress were deprecated
in 0.2.9.2-alpha and now have been removed. Use the ORPort option
(and others) to configure listen-only and advertise-only addresses.
o Removed features (tools):
- We've removed the tor-checkkey tool from src/tools. Long ago, we
used it to help people detect RSA keys that were generated by
versions of Debian affected by CVE-2008-0166. But those keys have
been out of circulation for ages, and this tool is no longer
required. Closes ticket 21842.
Changes in version 0.3.0.7 - 2017-05-15
Tor 0.3.0.7 fixes a medium-severity security bug in earlier versions
of Tor 0.3.0.x, where an attacker could cause a Tor relay process
to exit. Relays running earlier versions of Tor 0.3.0.x should upgrade;
clients are not affected.
o Major bugfixes (hidden service directory, security):
- Fix an assertion failure in the hidden service directory code, which
could be used by an attacker to remotely cause a Tor relay process to
exit. Relays running earlier versions of Tor 0.3.0.x should upgrade.
should upgrade. This security issue is tracked as TROVE-2017-002.
Fixes bug 22246; bugfix on 0.3.0.1-alpha.
o Minor features:
- Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
Country database.
o Minor features (future-proofing):
- Tor no longer refuses to download microdescriptors or descriptors
if they are listed as "published in the future". This change will
eventually allow us to stop listing meaningful "published" dates
in microdescriptor consensuses, and thereby allow us to reduce the
resources required to download consensus diffs by over 50%.
Implements part of ticket 21642; implements part of proposal 275.
o Minor bugfixes (Linux seccomp2 sandbox):
- The getpid() system call is now permitted under the Linux seccomp2
sandbox, to avoid crashing with versions of OpenSSL (and other
libraries) that attempt to learn the process's PID by using the
syscall rather than the VDSO code. Fixes bug 21943; bugfix
on 0.2.5.1-alpha.
Changes in version 0.3.0.6 - 2017-04-26
Tor 0.3.0.6 is the first stable release of the Tor 0.3.0 series.
With the 0.3.0 series, clients and relays now use Ed25519 keys to
authenticate their link connections to relays, rather than the old
RSA1024 keys that they used before. (Circuit crypto has been
Curve25519-authenticated since 0.2.4.8-alpha.) We have also replaced
the guard selection and replacement algorithm to behave more robustly
in the presence of unreliable networks, and to resist guard-
capture attacks.
This series also includes numerous other small features and bugfixes,
along with more groundwork for the upcoming hidden-services revamp.
Per our stable release policy, we plan to support the Tor 0.3.0
release series for at least the next nine months, or for three months
after the first stable release of the 0.3.1 series: whichever is
longer. If you need a release with long-term support, we recommend
that you stay with the 0.2.9 series.
Below are the changes since 0.3.0.5-rc. For a list of all changes
since 0.2.9, see the ReleaseNotes file.
o Minor features (geoip):
- Update geoip and geoip6 to the April 4 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (control port):
- The GETINFO extra-info/digest/<digest> command was broken because
of a wrong base16 decode return value check, introduced when
refactoring that API. Fixes bug 22034; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (crash prevention):
- Fix a (currently untriggerable, but potentially dangerous) crash
bug when base32-encoding inputs whose sizes are not a multiple of
5. Fixes bug 21894; bugfix on 0.2.9.1-alpha.
Changes in version 0.3.0.5-rc - 2017-04-05
Tor 0.3.0.5-rc fixes a few remaining bugs, large and small, in the
0.3.0 release series.
This is the second release candidate in the Tor 0.3.0 series, and has
much fewer changes than the first. If we find no new bugs or
regressions here, the first stable 0.3.0 release will be nearly
identical to it.
o Major bugfixes (crash, directory connections):
- Fix a rare crash when sending a begin cell on a circuit whose
linked directory connection had already been closed. Fixes bug
21576; bugfix on 0.2.9.3-alpha. Reported by Alec Muffett.
o Major bugfixes (guard selection):
- Fix a guard selection bug where Tor would refuse to bootstrap in
some cases if the user swapped a bridge for another bridge in
their configuration file. Fixes bug 21771; bugfix on 0.3.0.1-alpha.
Reported by "torvlnt33r".
o Minor features (geoip):
- Update geoip and geoip6 to the March 7 2017 Maxmind GeoLite2
Country database.
o Minor bugfix (compilation):
- Fix a warning when compiling hs_service.c. Previously, it had no
exported symbols when compiled for libor.a, resulting in a
compilation warning from clang. Fixes bug 21825; bugfix
on 0.3.0.1-alpha.
o Minor bugfixes (hidden services):
- Make hidden services check for failed intro point connections,
even when they have exceeded their intro point creation limit.
Fixes bug 21596; bugfix on 0.2.7.2-alpha. Reported by Alec Muffett.
- Make hidden services with 8 to 10 introduction points check for
failed circuits immediately after startup. Previously, they would
wait for 5 minutes before performing their first checks. Fixes bug
21594; bugfix on 0.2.3.9-alpha. Reported by Alec Muffett.
o Minor bugfixes (memory leaks):
- Fix a memory leak when using GETCONF on a port option. Fixes bug
21682; bugfix on 0.3.0.3-alpha.
o Minor bugfixes (relay):
- Avoid a double-marked-circuit warning that could happen when we
receive DESTROY cells under heavy load. Fixes bug 20059; bugfix
on 0.1.0.1-rc.
o Minor bugfixes (tests):
- Run the entry_guard_parse_from_state_full() test with the time set
to a specific date. (The guard state that this test was parsing
contained guards that had expired since the test was first
written.) Fixes bug 21799; bugfix on 0.3.0.1-alpha.
o Documentation:
- Update the description of the directory server options in the
manual page, to clarify that a relay no longer needs to set
DirPort in order to be a directory cache. Closes ticket 21720.
Changes in version 0.2.8.13 - 2017-03-03
Tor 0.2.8.13 backports a security fix from later Tor
releases. Anybody running Tor 0.2.8.12 or earlier should upgrade to this
this release, if for some reason they cannot upgrade to a later
release series, and if they build Tor with the --enable-expensive-hardening
option.
Note that support for Tor 0.2.8.x is ending next year: we will not issue
any fixes for the Tor 0.2.8.x series after 1 Jan 2018. If you need
a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
o Major bugfixes (parsing, backported from 0.3.0.4-rc):
- Fix an integer underflow bug when comparing malformed Tor
versions. This bug could crash Tor when built with
--enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
0.2.9.8, which were built with -ftrapv by default. In other cases
it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
on 0.0.8pre1. Found by OSS-Fuzz.
o Minor features (geoip):
- Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
Country database.
Changes in version 0.2.7.7 - 2017-03-03
Tor 0.2.7.7 backports a number of security fixes from later Tor
releases. Anybody running Tor 0.2.7.6 or earlier should upgrade to
this release, if for some reason they cannot upgrade to a later
release series.
Note that support for Tor 0.2.7.x is ending this year: we will not issue
any fixes for the Tor 0.2.7.x series after 1 August 2017. If you need
a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
o Directory authority changes (backport from 0.2.8.5-rc):
- Urras is no longer a directory authority. Closes ticket 19271.
o Directory authority changes (backport from 0.2.9.2-alpha):
- The "Tonga" bridge authority has been retired; the new bridge
authority is "Bifroest". Closes tickets 19728 and 19690.
o Directory authority key updates (backport from 0.2.8.1-alpha):
- Update the V3 identity key for the dannenberg directory authority:
it was changed on 18 November 2015. Closes task 17906. Patch
by "teor".
o Major bugfixes (parsing, security, backport from 0.2.9.8):
- Fix a bug in parsing that could cause clients to read a single
byte past the end of an allocated region. This bug could be used
to cause hardened clients (built with --enable-expensive-hardening)
to crash if they tried to visit a hostile hidden service. Non-
hardened clients are only affected depending on the details of
their platform's memory allocator. Fixes bug 21018; bugfix on
0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
2016-12-002 and as CVE-2016-1254.
o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
- Stop a crash that could occur when a client running with DNSPort
received a query with multiple address types, and the first
address type was not supported. Found and fixed by Scott Dial.
Fixes bug 18710; bugfix on 0.2.5.4-alpha.
- Prevent a class of security bugs caused by treating the contents
of a buffer chunk as if they were a NUL-terminated string. At
least one such bug seems to be present in all currently used
versions of Tor, and would allow an attacker to remotely crash
most Tor instances, especially those compiled with extra compiler
hardening. With this defense in place, such bugs can't crash Tor,
though we should still fix them as they occur. Closes ticket
20384 (TROVE-2016-10-001).
o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
- Avoid a difficult-to-trigger heap corruption attack when extending
a smartlist to contain over 16GB of pointers. Fixes bug 18162;
bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
Reported by Guido Vranken.
o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
- Avoid crashing when running as a DNS proxy. Fixes bug 16248;
bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
o Major bugfixes (key management, backport from 0.2.8.3-alpha):
- If OpenSSL fails to generate an RSA key, do not retain a dangling
pointer to the previous (uninitialized) key value. The impact here
should be limited to a difficult-to-trigger crash, if OpenSSL is
running an engine that makes key generation failures possible, or
if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
Baishakhi Ray.
o Major bugfixes (parsing, backported from 0.3.0.4-rc):
- Fix an integer underflow bug when comparing malformed Tor
versions. This bug could crash Tor when built with
--enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
0.2.9.8, which were built with -ftrapv by default. In other cases
it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
on 0.0.8pre1. Found by OSS-Fuzz.
o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
- Make memwipe() do nothing when passed a NULL pointer or buffer of
zero size. Check size argument to memwipe() for underflow. Fixes
bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
patch by "teor".
o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
- Make Tor survive errors involving connections without a
corresponding event object. Previously we'd fail with an
assertion; now we produce a log message. Related to bug 16248.
o Minor features (geoip):
- Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
Country database.
Changes in version 0.2.6.11 - 2017-03-03
Tor 0.2.6.11 backports a number of security fixes from later Tor
releases. Anybody running Tor 0.2.6.10 or earlier should upgrade to
this release, if for some reason they cannot upgrade to a later
release series.
Note that support for Tor 0.2.6.x is ending this year: we will not issue
any fixes for the Tor 0.2.6.x series after 1 August 2017. If you need
a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
o Directory authority changes (backport from 0.2.8.5-rc):
- Urras is no longer a directory authority. Closes ticket 19271.
o Directory authority changes (backport from 0.2.9.2-alpha):
- The "Tonga" bridge authority has been retired; the new bridge
authority is "Bifroest". Closes tickets 19728 and 19690.
o Directory authority key updates (backport from 0.2.8.1-alpha):
- Update the V3 identity key for the dannenberg directory authority:
it was changed on 18 November 2015. Closes task 17906. Patch
by "teor".
o Major features (security fixes, backport from 0.2.9.4-alpha):
- Prevent a class of security bugs caused by treating the contents
of a buffer chunk as if they were a NUL-terminated string. At
least one such bug seems to be present in all currently used
versions of Tor, and would allow an attacker to remotely crash
most Tor instances, especially those compiled with extra compiler
hardening. With this defense in place, such bugs can't crash Tor,
though we should still fix them as they occur. Closes ticket
20384 (TROVE-2016-10-001).
o Major bugfixes (parsing, security, backport from 0.2.9.8):
- Fix a bug in parsing that could cause clients to read a single
byte past the end of an allocated region. This bug could be used
to cause hardened clients (built with --enable-expensive-hardening)
to crash if they tried to visit a hostile hidden service. Non-
hardened clients are only affected depending on the details of
their platform's memory allocator. Fixes bug 21018; bugfix on
0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
2016-12-002 and as CVE-2016-1254.
o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
- Stop a crash that could occur when a client running with DNSPort
received a query with multiple address types, and the first
address type was not supported. Found and fixed by Scott Dial.
Fixes bug 18710; bugfix on 0.2.5.4-alpha.
o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
- Fix an error that could cause us to read 4 bytes before the
beginning of an openssl string. This bug could be used to cause
Tor to crash on systems with unusual malloc implementations, or
systems with unusual hardening installed. Fixes bug 17404; bugfix
on 0.2.3.6-alpha.
o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
- Avoid a difficult-to-trigger heap corruption attack when extending
a smartlist to contain over 16GB of pointers. Fixes bug 18162;
bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
Reported by Guido Vranken.
o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
- Avoid crashing when running as a DNS proxy. Fixes bug 16248;
bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
o Major bugfixes (guard selection, backport from 0.2.7.6):
- Actually look at the Guard flag when selecting a new directory
guard. When we implemented the directory guard design, we
accidentally started treating all relays as if they have the Guard
flag during guard selection, leading to weaker anonymity and worse
performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
by Mohsen Imani.
o Major bugfixes (key management, backport from 0.2.8.3-alpha):
- If OpenSSL fails to generate an RSA key, do not retain a dangling
pointer to the previous (uninitialized) key value. The impact here
should be limited to a difficult-to-trigger crash, if OpenSSL is
running an engine that makes key generation failures possible, or
if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
Baishakhi Ray.
o Major bugfixes (parsing, backported from 0.3.0.4-rc):
- Fix an integer underflow bug when comparing malformed Tor
versions. This bug could crash Tor when built with
--enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
0.2.9.8, which were built with -ftrapv by default. In other cases
it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
on 0.0.8pre1. Found by OSS-Fuzz.
o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
- Make memwipe() do nothing when passed a NULL pointer or buffer of
zero size. Check size argument to memwipe() for underflow. Fixes
bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
patch by "teor".
o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
- Make Tor survive errors involving connections without a
corresponding event object. Previously we'd fail with an
assertion; now we produce a log message. Related to bug 16248.
o Minor features (geoip):
- Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (compilation, backport from 0.2.7.6):
- Fix a compilation warning with Clang 3.6: Do not check the
presence of an address which can never be NULL. Fixes bug 17781.
Changes in version 0.2.5.13 - 2017-03-03
Tor 0.2.5.13 backports a number of security fixes from later Tor
releases. Anybody running Tor 0.2.5.13 or earlier should upgrade to
this release, if for some reason they cannot upgrade to a later
release series.
Note that support for Tor 0.2.5.x is ending next year: we will not issue
any fixes for the Tor 0.2.5.x series after 1 May 2018. If you need
a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
o Directory authority changes (backport from 0.2.8.5-rc):
- Urras is no longer a directory authority. Closes ticket 19271.
o Directory authority changes (backport from 0.2.9.2-alpha):
- The "Tonga" bridge authority has been retired; the new bridge
authority is "Bifroest". Closes tickets 19728 and 19690.
o Directory authority key updates (backport from 0.2.8.1-alpha):
- Update the V3 identity key for the dannenberg directory authority:
it was changed on 18 November 2015. Closes task 17906. Patch
by "teor".
o Major features (security fixes, backport from 0.2.9.4-alpha):
- Prevent a class of security bugs caused by treating the contents
of a buffer chunk as if they were a NUL-terminated string. At
least one such bug seems to be present in all currently used
versions of Tor, and would allow an attacker to remotely crash
most Tor instances, especially those compiled with extra compiler
hardening. With this defense in place, such bugs can't crash Tor,
though we should still fix them as they occur. Closes ticket
20384 (TROVE-2016-10-001).
o Major bugfixes (parsing, security, backport from 0.2.9.8):
- Fix a bug in parsing that could cause clients to read a single
byte past the end of an allocated region. This bug could be used
to cause hardened clients (built with --enable-expensive-hardening)
to crash if they tried to visit a hostile hidden service. Non-
hardened clients are only affected depending on the details of
their platform's memory allocator. Fixes bug 21018; bugfix on
0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
2016-12-002 and as CVE-2016-1254.
o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
- Stop a crash that could occur when a client running with DNSPort
received a query with multiple address types, and the first
address type was not supported. Found and fixed by Scott Dial.
Fixes bug 18710; bugfix on 0.2.5.4-alpha.
o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
- Fix an error that could cause us to read 4 bytes before the
beginning of an openssl string. This bug could be used to cause
Tor to crash on systems with unusual malloc implementations, or
systems with unusual hardening installed. Fixes bug 17404; bugfix
on 0.2.3.6-alpha.
o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
- Avoid a difficult-to-trigger heap corruption attack when extending
a smartlist to contain over 16GB of pointers. Fixes bug 18162;
bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
Reported by Guido Vranken.
o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
- Avoid crashing when running as a DNS proxy. Fixes bug 16248;
bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
o Major bugfixes (guard selection, backport from 0.2.7.6):
- Actually look at the Guard flag when selecting a new directory
guard. When we implemented the directory guard design, we
accidentally started treating all relays as if they have the Guard
flag during guard selection, leading to weaker anonymity and worse
performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
by Mohsen Imani.
o Major bugfixes (key management, backport from 0.2.8.3-alpha):
- If OpenSSL fails to generate an RSA key, do not retain a dangling
pointer to the previous (uninitialized) key value. The impact here
should be limited to a difficult-to-trigger crash, if OpenSSL is
running an engine that makes key generation failures possible, or
if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
Baishakhi Ray.
o Major bugfixes (parsing, backported from 0.3.0.4-rc):
- Fix an integer underflow bug when comparing malformed Tor
versions. This bug could crash Tor when built with
--enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
0.2.9.8, which were built with -ftrapv by default. In other cases
it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
on 0.0.8pre1. Found by OSS-Fuzz.
o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
- Make memwipe() do nothing when passed a NULL pointer or buffer of
zero size. Check size argument to memwipe() for underflow. Fixes
bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
patch by "teor".
o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
- Make Tor survive errors involving connections without a
corresponding event object. Previously we'd fail with an
assertion; now we produce a log message. Related to bug 16248.
o Minor features (geoip):
- Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (compilation, backport from 0.2.7.6):
- Fix a compilation warning with Clang 3.6: Do not check the
presence of an address which can never be NULL. Fixes bug 17781.
o Minor bugfixes (crypto error-handling, backport from 0.2.7.2-alpha):
- Check for failures from crypto_early_init, and refuse to continue.
A previous typo meant that we could keep going with an
uninitialized crypto library, and would have OpenSSL initialize
its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
when implementing ticket 4900. Patch by "teor".
o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
- Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
a client authorized hidden service. Fixes bug 15823; bugfix
on 0.2.1.6-alpha.
Changes in version 0.2.4.28 - 2017-03-03
Tor 0.2.4.28 backports a number of security fixes from later Tor
releases. Anybody running Tor 0.2.4.27 or earlier should upgrade to
this release, if for some reason they cannot upgrade to a later
release series.
Note that support for Tor 0.2.4.x is ending soon: we will not issue
any fixes for the Tor 0.2.4.x series after 1 August 2017. If you need
a Tor release series with long-term support, we recommend Tor 0.2.9.x.
o Directory authority changes (backport from 0.2.8.5-rc):
- Urras is no longer a directory authority. Closes ticket 19271.
o Directory authority changes (backport from 0.2.9.2-alpha):
- The "Tonga" bridge authority has been retired; the new bridge
authority is "Bifroest". Closes tickets 19728 and 19690.
o Directory authority key updates (backport from 0.2.8.1-alpha):
- Update the V3 identity key for the dannenberg directory authority:
it was changed on 18 November 2015. Closes task 17906. Patch
by "teor".
o Major features (security fixes, backport from 0.2.9.4-alpha):
- Prevent a class of security bugs caused by treating the contents
of a buffer chunk as if they were a NUL-terminated string. At
least one such bug seems to be present in all currently used
versions of Tor, and would allow an attacker to remotely crash
most Tor instances, especially those compiled with extra compiler
hardening. With this defense in place, such bugs can't crash Tor,
though we should still fix them as they occur. Closes ticket
20384 (TROVE-2016-10-001).
o Major bugfixes (parsing, security, backport from 0.2.9.8):
- Fix a bug in parsing that could cause clients to read a single
byte past the end of an allocated region. This bug could be used
to cause hardened clients (built with --enable-expensive-hardening)
to crash if they tried to visit a hostile hidden service. Non-
hardened clients are only affected depending on the details of
their platform's memory allocator. Fixes bug 21018; bugfix on
0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
2016-12-002 and as CVE-2016-1254.
o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
- Fix an error that could cause us to read 4 bytes before the
beginning of an openssl string. This bug could be used to cause
Tor to crash on systems with unusual malloc implementations, or
systems with unusual hardening installed. Fixes bug 17404; bugfix
on 0.2.3.6-alpha.
o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
- Avoid a difficult-to-trigger heap corruption attack when extending
a smartlist to contain over 16GB of pointers. Fixes bug 18162;
bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
Reported by Guido Vranken.
o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
- Avoid crashing when running as a DNS proxy. Fixes bug 16248;
bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
o Major bugfixes (guard selection, backport from 0.2.7.6):
- Actually look at the Guard flag when selecting a new directory
guard. When we implemented the directory guard design, we
accidentally started treating all relays as if they have the Guard
flag during guard selection, leading to weaker anonymity and worse
performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
by Mohsen Imani.
o Major bugfixes (key management, backport from 0.2.8.3-alpha):
- If OpenSSL fails to generate an RSA key, do not retain a dangling
pointer to the previous (uninitialized) key value. The impact here
should be limited to a difficult-to-trigger crash, if OpenSSL is
running an engine that makes key generation failures possible, or
if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
Baishakhi Ray.
o Major bugfixes (parsing, backported from 0.3.0.4-rc):
- Fix an integer underflow bug when comparing malformed Tor
versions. This bug could crash Tor when built with
--enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
0.2.9.8, which were built with -ftrapv by default. In other cases
it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
on 0.0.8pre1. Found by OSS-Fuzz.
o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
- Make memwipe() do nothing when passed a NULL pointer or buffer of
zero size. Check size argument to memwipe() for underflow. Fixes
bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
patch by "teor".
o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
- Make Tor survive errors involving connections without a
corresponding event object. Previously we'd fail with an
assertion; now we produce a log message. Related to bug 16248.
o Minor features (DoS-resistance, backport from 0.2.7.1-alpha):
- Make it harder for attackers to overload hidden services with
introductions, by blocking multiple introduction requests on the
same circuit. Resolves ticket 15515.
o Minor features (geoip):
- Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (compilation, backport from 0.2.7.6):
- Fix a compilation warning with Clang 3.6: Do not check the
presence of an address which can never be NULL. Fixes bug 17781.
o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
- Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
a client authorized hidden service. Fixes bug 15823; bugfix
on 0.2.1.6-alpha.
Changes in version 0.3.0.4-rc - 2017-03-01
Tor 0.3.0.4-rc fixes some remaining bugs, large and small, in the
0.3.0 release series, and introduces a few reliability features to
keep them from coming back.
This is the first release candidate in the Tor 0.3.0 series. If we
find no new bugs or regressions here, the first stable 0.3.0 release
will be nearly identical to it.
o Major bugfixes (bridges):
- When the same bridge is configured multiple times with the same
identity, but at different address:port combinations, treat those
bridge instances as separate guards. This fix restores the ability
of clients to configure the same bridge with multiple pluggable
transports. Fixes bug 21027; bugfix on 0.3.0.1-alpha.
o Major bugfixes (hidden service directory v3):
- Stop crashing on a failed v3 hidden service descriptor lookup
failure. Fixes bug 21471; bugfixes on 0.3.0.1-alpha.
o Major bugfixes (parsing):
- When parsing a malformed content-length field from an HTTP
message, do not read off the end of the buffer. This bug was a
potential remote denial-of-service attack against Tor clients and
relays. A workaround was released in October 2016, to prevent this
bug from crashing Tor. This is a fix for the underlying issue,
which should no longer matter (if you applied the earlier patch).
Fixes bug 20894; bugfix on 0.2.0.16-alpha. Bug found by fuzzing
using AFL (http://lcamtuf.coredump.cx/afl/).
- Fix an integer underflow bug when comparing malformed Tor
versions. This bug could crash Tor when built with
--enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
0.2.9.8, which were built with -ftrapv by default. In other cases
it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
on 0.0.8pre1. Found by OSS-Fuzz.
o Minor feature (protocol versioning):
- Add new protocol version for proposal 224. HSIntro now advertises
version "3-4" and HSDir version "1-2". Fixes ticket 20656.
o Minor features (directory authorities):
- Directory authorities now reject descriptors that claim to be
malformed versions of Tor. Helps prevent exploitation of
bug 21278.
- Reject version numbers with components that exceed INT32_MAX.
Otherwise 32-bit and 64-bit platforms would behave inconsistently.
Fixes bug 21450; bugfix on 0.0.8pre1.
- Directory authorities now reject relays running versions
0.2.9.1-alpha through 0.2.9.4-alpha, because those relays
suffer from bug 20499 and don't keep their consensus cache
up-to-date. Resolves ticket 20509.
o Minor features (geoip):
- Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
Country database.
o Minor features (reliability, crash):
- Try better to detect problems in buffers where they might grow (or
think they have grown) over 2 GB in size. Diagnostic for
bug 21369.
o Minor features (testing):
- During 'make test-network-all', if tor logs any warnings, ask
chutney to output them. Requires a recent version of chutney with
the 21572 patch. Implements 21570.
o Minor bugfixes (certificate expiration time):
- Avoid using link certificates that don't become valid till some
time in the future. Fixes bug 21420; bugfix on 0.2.4.11-alpha
o Minor bugfixes (code correctness):
- Repair a couple of (unreachable or harmless) cases of the risky
comparison-by-subtraction pattern that caused bug 21278.
- Remove a redundant check for the UseEntryGuards option from the
options_transition_affects_guards() function. Fixes bug 21492;
bugfix on 0.3.0.1-alpha.
o Minor bugfixes (directory mirrors):
- Allow relays to use directory mirrors without a DirPort: these
relays need to be contacted over their ORPorts using a begindir
connection. Fixes one case of bug 20711; bugfix on 0.2.8.2-alpha.
- Clarify the message logged when a remote relay is unexpectedly
missing an ORPort or DirPort: users were confusing this with a
local port. Fixes another case of bug 20711; bugfix
on 0.2.8.2-alpha.
o Minor bugfixes (guards):
- Don't warn about a missing guard state on timeout-measurement
circuits: they aren't supposed to be using guards. Fixes an
instance of bug 21007; bugfix on 0.3.0.1-alpha.
- Silence a BUG() warning when attempting to use a guard whose
descriptor we don't know, and make this scenario less likely to
happen. Fixes bug 21415; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (hidden service):
- Pass correct buffer length when encoding legacy ESTABLISH_INTRO
cells. Previously, we were using sizeof() on a pointer, instead of
the real destination buffer. Fortunately, that value was only used
to double-check that there was enough room--which was already
enforced elsewhere. Fixes bug 21553; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (testing):
- Fix Raspbian build issues related to missing socket errno in
test_util.c. Fixes bug 21116; bugfix on 0.2.8.2. Patch
by "hein".
- Rename "make fuzz" to "make test-fuzz-corpora", since it doesn't
actually fuzz anything. Fixes bug 21447; bugfix on 0.3.0.3-alpha.
- Use bash in src/test/test-network.sh. This ensures we reliably
call chutney's newer tools/test-network.sh when available. Fixes
bug 21562; bugfix on 0.2.9.1-alpha.
o Documentation:
- Small fixes to the fuzzing documentation. Closes ticket 21472.
Changes in version 0.2.9.10 - 2017-03-01
Tor 0.2.9.10 backports a security fix from later Tor release. It also
includes fixes for some major issues affecting directory authorities,
LibreSSL compatibility, and IPv6 correctness.
The Tor 0.2.9.x release series is now marked as a long-term-support
series. We intend to backport security fixes to 0.2.9.x until at
least January of 2020.
o Major bugfixes (directory authority, 0.3.0.3-alpha):
- During voting, when marking a relay as a probable sybil, do not
clear its BadExit flag: sybils can still be bad in other ways
too. (We still clear the other flags.) Fixes bug 21108; bugfix
on 0.2.0.13-alpha.
o Major bugfixes (IPv6 Exits, backport from 0.3.0.3-alpha):
- Stop rejecting all IPv6 traffic on Exits whose exit policy rejects
any IPv6 addresses. Instead, only reject a port over IPv6 if the
exit policy rejects that port on more than an IPv6 /16 of
addresses. This bug was made worse by 17027 in 0.2.8.1-alpha,
which rejected a relay's own IPv6 address by default. Fixes bug
21357; bugfix on commit 004f3f4e53 in 0.2.4.7-alpha.
o Major bugfixes (parsing, also in 0.3.0.4-rc):
- Fix an integer underflow bug when comparing malformed Tor
versions. This bug could crash Tor when built with
--enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
0.2.9.8, which were built with -ftrapv by default. In other cases
it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
on 0.0.8pre1. Found by OSS-Fuzz.
o Minor features (directory authorities, also in 0.3.0.4-rc):
- Directory authorities now reject descriptors that claim to be
malformed versions of Tor. Helps prevent exploitation of
bug 21278.
- Reject version numbers with components that exceed INT32_MAX.
Otherwise 32-bit and 64-bit platforms would behave inconsistently.
Fixes bug 21450; bugfix on 0.0.8pre1.
o Minor features (geoip):
- Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
Country database.
o Minor features (portability, compilation, backport from 0.3.0.3-alpha):
- Autoconf now checks to determine if OpenSSL structures are opaque,
instead of explicitly checking for OpenSSL version numbers. Part
of ticket 21359.
- Support building with recent LibreSSL code that uses opaque
structures. Closes ticket 21359.
o Minor bugfixes (code correctness, also in 0.3.0.4-rc):
- Repair a couple of (unreachable or harmless) cases of the risky
comparison-by-subtraction pattern that caused bug 21278.
o Minor bugfixes (tor-resolve, backport from 0.3.0.3-alpha):
- The tor-resolve command line tool now rejects hostnames over 255
characters in length. Previously, it would silently truncate them,
which could lead to bugs. Fixes bug 21280; bugfix on 0.0.9pre5.
Patch by "junglefowl".
Changes in version 0.3.0.3-alpha - 2017-02-03
Tor 0.3.0.3-alpha fixes a few significant bugs introduced over the
0.3.0.x development series, including some that could cause
authorities to behave badly. There is also a fix for a longstanding
bug that could prevent IPv6 exits from working. Tor 0.3.0.3-alpha also
includes some smaller features and bugfixes.
The Tor 0.3.0.x release series is now in patch-freeze: no additional
features will be considered for inclusion in 0.3.0.x. We suspect that
some bugs will probably remain, however, and we encourage people to
test this release.
o Major bugfixes (directory authority):
- During voting, when marking a relay as a probable sybil, do not
clear its BadExit flag: sybils can still be bad in other ways
too. (We still clear the other flags.) Fixes bug 21108; bugfix
on 0.2.0.13-alpha.
- When deciding whether we have just found a router to be reachable,
do not penalize it for not having performed an Ed25519 link
handshake if it does not claim to support an Ed25519 handshake.
Previously, we would treat such relays as non-running. Fixes bug
21107; bugfix on 0.3.0.1-alpha.
o Major bugfixes (entry guards):
- Stop trying to build circuits through entry guards for which we
have no descriptor. Also, stop crashing in the case that we *do*
accidentally try to build a circuit in such a state. Fixes bug
21242; bugfix on 0.3.0.1-alpha.
o Major bugfixes (IPv6 Exits):
- Stop rejecting all IPv6 traffic on Exits whose exit policy rejects
any IPv6 addresses. Instead, only reject a port over IPv6 if the
exit policy rejects that port on more than an IPv6 /16 of
addresses. This bug was made worse by 17027 in 0.2.8.1-alpha,
which rejected a relay's own IPv6 address by default. Fixes bug
21357; bugfix on commit 004f3f4e53 in 0.2.4.7-alpha.
o Minor feature (client):
- Enable IPv6 traffic on the SocksPort by default. To disable this,
a user will have to specify "NoIPv6Traffic". Closes ticket 21269.
o Minor feature (fallback scripts):
- Add a check_existing mode to updateFallbackDirs.py, which checks
if fallbacks in the hard-coded list are working. Closes ticket
20174. Patch by haxxpop.
o Minor features (ciphersuite selection):
- Clients now advertise a list of ciphersuites closer to the ones
preferred by Firefox. Closes part of ticket 15426.
- Allow relays to accept a wider range of ciphersuites, including
chacha20-poly1305 and AES-CCM. Closes the other part of 15426.
o Minor features (controller, configuration):
- Each of the *Port options, such as SocksPort, ORPort, ControlPort,
and so on, now comes with a __*Port variant that will not be saved
to the torrc file by the controller's SAVECONF command. This
change allows TorBrowser to set up a single-use domain socket for
each time it launches Tor. Closes ticket 20956.
- The GETCONF command can now query options that may only be
meaningful in context-sensitive lists. This allows the controller
to query the mixed SocksPort/__SocksPort style options introduced
in feature 20956. Implements ticket 21300.
o Minor features (portability, compilation):
- Autoconf now checks to determine if OpenSSL structures are opaque,
instead of explicitly checking for OpenSSL version numbers. Part
of ticket 21359.
- Support building with recent LibreSSL code that uses opaque
structures. Closes ticket 21359.
o Minor features (relay):
- We now allow separation of exit and relay traffic to different
source IP addresses, using the OutboundBindAddressExit and
OutboundBindAddressOR options respectively. Closes ticket 17975.
Written by Michael Sonntag.
o Minor bugfix (logging):
- Don't recommend the use of Tor2web in non-anonymous mode.
Recommending Tor2web is a bad idea because the client loses all
anonymity. Tor2web should only be used in specific cases by users
who *know* and understand the issues. Fixes bug 21294; bugfix
on 0.2.9.3-alpha.
o Minor bugfixes (client):
- Always recover from failures in extend_info_from_node(), in an
attempt to prevent any recurrence of bug 21242. Fixes bug 21372;
bugfix on 0.2.3.1-alpha.
o Minor bugfixes (client, entry guards):
- Fix a bug warning (with backtrace) when we fail a channel that
circuits to fallback directories on it. Fixes bug 21128; bugfix
on 0.3.0.1-alpha.
- Fix a spurious bug warning (with backtrace) when removing an
expired entry guard. Fixes bug 21129; bugfix on 0.3.0.1-alpha.
- Fix a bug of the new guard algorithm where tor could stall for up
to 10 minutes before retrying a guard after a long period of no
network. Fixes bug 21052; bugfix on 0.3.0.1-alpha.
- Do not try to build circuits until we have descriptors for our
primary entry guards. Related to fix for bug 21242.
o Minor bugfixes (configure, autoconf):
- Rename the configure option --enable-expensive-hardening to
--enable-fragile-hardening. Expensive hardening makes the tor
daemon abort when some kinds of issues are detected. Thus, it
makes tor more at risk of remote crashes but safer against RCE or
heartbleed bug category. We now try to explain this issue in a
message from the configure script. Fixes bug 21290; bugfix
on 0.2.5.4-alpha.
o Minor bugfixes (controller):
- Restore the (deprecated) DROPGUARDS controller command. Fixes bug
20824; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (hidden service):
- Clean up the code for expiring intro points with no associated
circuits. It was causing, rarely, a service with some expiring
introduction points to not open enough additional introduction
points. Fixes part of bug 21302; bugfix on 0.2.7.2-alpha.
- Stop setting the torrc option HiddenServiceStatistics to "0" just
because we're not a bridge or relay. Instead, we preserve whatever
value the user set (or didn't set). Fixes bug 21150; bugfix
on 0.2.6.2-alpha.
- Resolve two possible underflows which could lead to creating and
closing a lot of introduction point circuits in a non-stop loop.
Fixes bug 21302; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (portability):
- Use "OpenBSD" compiler macro instead of "OPENBSD" or "__OpenBSD__".
It is supported by OpenBSD itself, and also by most OpenBSD
variants (such as Bitrig). Fixes bug 20980; bugfix
on 0.1.2.1-alpha.
- When mapping a file of length greater than SIZE_MAX, do not
silently truncate its contents. This issue could occur on 32 bit
systems with large file support and files which are larger than 4
GB. Fixes bug 21134; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (tor-resolve):
- The tor-resolve command line tool now rejects hostnames over 255
characters in length. Previously, it would silently truncate them,
which could lead to bugs. Fixes bug 21280; bugfix on 0.0.9pre5.
Patch by "junglefowl".
o Minor bugfixes (Windows services):
- Be sure to initialize the monotonic time subsystem before using
it, even when running as an NT service. Fixes bug 21356; bugfix
on 0.2.9.1-alpha.
Changes in version 0.3.0.2-alpha - 2017-01-23
Tor 0.3.0.2-alpha fixes a denial-of-service bug where an attacker could
cause relays and clients to crash, even if they were not built with
the --enable-expensive-hardening option. This bug affects all 0.2.9.x
versions, and also affects 0.3.0.1-alpha: all relays running an affected
version should upgrade.
Tor 0.3.0.2-alpha also improves how exit relays and clients handle DNS
time-to-live values, makes directory authorities enforce the 1-to-1
mapping of relay RSA identity keys to ED25519 identity keys, fixes a
client-side onion service reachability bug, does better at selecting
the set of fallback directories, and more.
o Major bugfixes (security, also in 0.2.9.9):
- Downgrade the "-ftrapv" option from "always on" to "only on when
--enable-expensive-hardening is provided." This hardening option, like
others, can turn survivable bugs into crashes--and having it on by
default made a (relatively harmless) integer overflow bug into a
denial-of-service bug. Fixes bug 21278 (TROVE-2017-001); bugfix on
0.2.9.1-alpha.
o Major features (security):
- Change the algorithm used to decide DNS TTLs on client and server
side, to better resist DNS-based correlation attacks like the
DefecTor attack of Greschbach, Pulls, Roberts, Winter, and
Feamster. Now relays only return one of two possible DNS TTL
values, and clients are willing to believe DNS TTL values up to 3
hours long. Closes ticket 19769.
o Major features (directory authority, security):
- The default for AuthDirPinKeys is now 1: directory authorities
will reject relays where the RSA identity key matches a previously
seen value, but the Ed25519 key has changed. Closes ticket 18319.
o Major bugfixes (client, guard, crash):
- In circuit_get_global_origin_list(), return the actual list of
origin circuits. The previous version of this code returned the
list of all the circuits, and could have caused strange bugs,
including possible crashes. Fixes bug 21118; bugfix
on 0.3.0.1-alpha.
o Major bugfixes (client, onion service, also in 0.2.9.9):
- Fix a client-side onion service reachability bug, where multiple
socks requests to an onion service (or a single slow request)
could cause us to mistakenly mark some of the service's
introduction points as failed, and we cache that failure so
eventually we run out and can't reach the service. Also resolves a
mysterious "Remote server sent bogus reason code 65021" log
warning. The bug was introduced in ticket 17218, where we tried to
remember the circuit end reason as a uint16_t, which mangled
negative values. Partially fixes bug 21056 and fixes bug 20307;
bugfix on 0.2.8.1-alpha.
o Major bugfixes (DNS):
- Fix a bug that prevented exit nodes from caching DNS records for
more than 60 seconds. Fixes bug 19025; bugfix on 0.2.4.7-alpha.
o Minor features (controller):
- Add "GETINFO sr/current" and "GETINFO sr/previous" keys, to expose
shared-random values to the controller. Closes ticket 19925.
o Minor features (entry guards):
- Add UseEntryGuards to TEST_OPTIONS_DEFAULT_VALUES in order to not
break regression tests.
- Require UseEntryGuards when UseBridges is set, in order to make
sure bridges aren't bypassed. Resolves ticket 20502.
o Minor features (fallback directories):
- Select 200 fallback directories for each release. Closes
ticket 20881.
- Allow 3 fallback relays per operator, which is safe now that we
are choosing 200 fallback relays. Closes ticket 20912.
- Exclude relays affected by bug 20499 from the fallback list.
Exclude relays from the fallback list if they are running versions
known to be affected by bug 20499, or if in our tests they deliver
a stale consensus (i.e. one that expired more than 24 hours ago).
Closes ticket 20539.
- Reduce the minimum fallback bandwidth to 1 MByte/s. Part of
ticket 18828.
- Require fallback directories to have the same address and port for
7 days (now that we have enough relays with this stability).
Relays whose OnionOO stability timer is reset on restart by bug
18050 should upgrade to Tor 0.2.8.7 or later, which has a fix for
this issue. Closes ticket 20880; maintains short-term fix
in 0.2.8.2-alpha.
- Require fallbacks to have flags for 90% of the time (weighted
decaying average), rather than 95%. This allows at least 73% of
clients to bootstrap in the first 5 seconds without contacting an
authority. Part of ticket 18828.
- Annotate updateFallbackDirs.py with the bandwidth and consensus
weight for each candidate fallback. Closes ticket 20878.
- Make it easier to change the output sort order of fallbacks.
Closes ticket 20822.
- Display the relay fingerprint when downloading consensuses from
fallbacks. Closes ticket 20908.
o Minor features (geoip, also in 0.2.9.9):
- Update geoip and geoip6 to the January 4 2017 Maxmind GeoLite2
Country database.
o Minor features (next-gen onion service directories):
- Remove the "EnableOnionServicesV3" consensus parameter that we
introduced in 0.3.0.1-alpha: relays are now always willing to act
as v3 onion service directories. Resolves ticket 19899.
o Minor features (linting):
- Enhance the changes file linter to warn on Tor versions that are
prefixed with "tor-". Closes ticket 21096.
o Minor features (logging):
- In several places, describe unset ed25519 keys as "<unset>",
rather than the scary "AAAAAAAA...AAA". Closes ticket 21037.
o Minor bugfix (control protocol):
- The reply to a "GETINFO config/names" request via the control
protocol now spells the type "Dependent" correctly. This is a
breaking change in the control protocol. (The field seems to be
ignored by the most common known controllers.) Fixes bug 18146;
bugfix on 0.1.1.4-alpha.
o Minor bugfixes (bug resilience):
- Fix an unreachable size_t overflow in base64_decode(). Fixes bug
19222; bugfix on 0.2.0.9-alpha. Found by Guido Vranken; fixed by
Hans Jerry Illikainen.
o Minor bugfixes (build):
- Replace obsolete Autoconf macros with their modern equivalent and
prevent similar issues in the future. Fixes bug 20990; bugfix
on 0.1.0.1-rc.
o Minor bugfixes (client, guards):
- Fix bug where Tor would think that there are circuits waiting for
better guards even though those circuits have been freed. Fixes
bug 21142; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (config):
- Don't assert on startup when trying to get the options list and
LearnCircuitBuildTimeout is set to 0: we are currently parsing the
options so of course they aren't ready yet. Fixes bug 21062;
bugfix on 0.2.9.3-alpha.
o Minor bugfixes (controller):
- Make the GETINFO interface for inquiring about entry guards
support the new guards backend. Fixes bug 20823; bugfix
on 0.3.0.1-alpha.
o Minor bugfixes (dead code):
- Remove a redundant check for PidFile changes at runtime in
options_transition_allowed(): this check is already performed
regardless of whether the sandbox is active. Fixes bug 21123;
bugfix on 0.2.5.4-alpha.
o Minor bugfixes (documentation):
- Update the tor manual page to document every option that can not
be changed while tor is running. Fixes bug 21122.
o Minor bugfixes (fallback directories):
- Stop failing when a relay has no uptime data in
updateFallbackDirs.py. Fixes bug 20945; bugfix on 0.2.8.1-alpha.
- Avoid checking fallback candidates' DirPorts if they are down in
OnionOO. When a relay operator has multiple relays, this
prioritizes relays that are up over relays that are down. Fixes
bug 20926; bugfix on 0.2.8.3-alpha.
- Stop failing when OUTPUT_COMMENTS is True in updateFallbackDirs.py.
Fixes bug 20877; bugfix on 0.2.8.3-alpha.
o Minor bugfixes (guards, bootstrapping):
- When connecting to a directory guard during bootstrap, do not mark
the guard as successful until we receive a good-looking directory
response from it. Fixes bug 20974; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (onion services):
- Fix the config reload pruning of old vs new services so it
actually works when both ephemeral and non-ephemeral services are
configured. Fixes bug 21054; bugfix on 0.3.0.1-alpha.
- Allow the number of introduction points to be as low as 0, rather
than as low as 3. Fixes bug 21033; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (IPv6):
- Make IPv6-using clients try harder to find an IPv6 directory
server. Fixes bug 20999; bugfix on 0.2.8.2-alpha.
- When IPv6 addresses have not been downloaded yet (microdesc
consensus documents don't list relay IPv6 addresses), use hard-
coded addresses for authorities, fallbacks, and configured
bridges. Now IPv6-only clients can use microdescriptors. Fixes bug
20996; bugfix on b167e82 from 19608 in 0.2.8.5-alpha.
o Minor bugfixes (memory leaks):
- Fix a memory leak when configuring hidden services. Fixes bug
20987; bugfix on 0.3.0.1-alpha.
o Minor bugfixes (portability, also in 0.2.9.9):
- Avoid crashing when Tor is built using headers that contain
CLOCK_MONOTONIC_COARSE, but then tries to run on an older kernel
without CLOCK_MONOTONIC_COARSE. Fixes bug 21035; bugfix
on 0.2.9.1-alpha.
- Fix Libevent detection on platforms without Libevent 1 headers
installed. Fixes bug 21051; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (relay):
- Honor DataDirectoryGroupReadable when tor is a relay. Previously,
initializing the keys would reset the DataDirectory to 0700
instead of 0750 even if DataDirectoryGroupReadable was set to 1.
Fixes bug 19953; bugfix on 0.0.2pre16. Patch by "redfish".
o Minor bugfixes (testing):
- Remove undefined behavior from the backtrace generator by removing
its signal handler. Fixes bug 21026; bugfix on 0.2.5.2-alpha.
o Minor bugfixes (unit tests):
- Allow the unit tests to pass even when DNS lookups of bogus
addresses do not fail as expected. Fixes bug 20862 and 20863;
bugfix on unit tests introduced in 0.2.8.1-alpha
through 0.2.9.4-alpha.
o Code simplification and refactoring:
- Refactor code to manipulate global_origin_circuit_list into
separate functions. Closes ticket 20921.
o Documentation (formatting):
- Clean up formatting of tor.1 man page and HTML doc, where <pre>
blocks were incorrectly appearing. Closes ticket 20885.
o Documentation (man page):
- Clarify many options in tor.1 and add some min/max values for
HiddenService options. Closes ticket 21058.
Changes in version 0.2.9.9 - 2017-01-23
Tor 0.2.9.9 fixes a denial-of-service bug where an attacker could
cause relays and clients to crash, even if they were not built with
the --enable-expensive-hardening option. This bug affects all 0.2.9.x
versions, and also affects 0.3.0.1-alpha: all relays running an affected
version should upgrade.
This release also resolves a client-side onion service reachability
bug, and resolves a pair of small portability issues.
o Major bugfixes (security):
- Downgrade the "-ftrapv" option from "always on" to "only on when
--enable-expensive-hardening is provided." This hardening option,
like others, can turn survivable bugs into crashes -- and having
it on by default made a (relatively harmless) integer overflow bug
into a denial-of-service bug. Fixes bug 21278 (TROVE-2017-001);
bugfix on 0.2.9.1-alpha.
o Major bugfixes (client, onion service):
- Fix a client-side onion service reachability bug, where multiple
socks requests to an onion service (or a single slow request)
could cause us to mistakenly mark some of the service's
introduction points as failed, and we cache that failure so
eventually we run out and can't reach the service. Also resolves a
mysterious "Remote server sent bogus reason code 65021" log
warning. The bug was introduced in ticket 17218, where we tried to
remember the circuit end reason as a uint16_t, which mangled
negative values. Partially fixes bug 21056 and fixes bug 20307;
bugfix on 0.2.8.1-alpha.
o Minor features (geoip):
- Update geoip and geoip6 to the January 4 2017 Maxmind GeoLite2
Country database.
o Minor bugfixes (portability):
- Avoid crashing when Tor is built using headers that contain
CLOCK_MONOTONIC_COARSE, but then tries to run on an older kernel
without CLOCK_MONOTONIC_COARSE. Fixes bug 21035; bugfix
on 0.2.9.1-alpha.
- Fix Libevent detection on platforms without Libevent 1 headers
installed. Fixes bug 21051; bugfix on 0.2.9.1-alpha.
Changes in version 0.3.0.1-alpha - 2016-12-19
Tor 0.3.0.1-alpha is the first alpha release in the 0.3.0 development
series. It strengthens Tor's link and circuit handshakes by
identifying relays by their Ed25519 keys, improves the algorithm that
clients use to choose and maintain their list of guards, and includes
additional backend support for the next-generation hidden service
design. It also contains numerous other small features and
improvements to security, correctness, and performance.
Below are the changes since 0.2.9.8.
o Major features (guard selection algorithm):
- Tor's guard selection algorithm has been redesigned from the
ground up, to better support unreliable networks and restrictive
sets of entry nodes, and to better resist guard-capture attacks by
hostile local networks. Implements proposal 271; closes
ticket 19877.
o Major features (next-generation hidden services):
- Relays can now handle v3 ESTABLISH_INTRO cells as specified by
prop224 aka "Next Generation Hidden Services". Service and clients
don't use this functionality yet. Closes ticket 19043. Based on
initial code by Alec Heifetz.
- Relays now support the HSDir version 3 protocol, so that they can
can store and serve v3 descriptors. This is part of the next-
generation onion service work detailed in proposal 224. Closes
ticket 17238.
o Major features (protocol, ed25519 identity keys):
- Relays now use Ed25519 to prove their Ed25519 identities and to
one another, and to clients. This algorithm is faster and more
secure than the RSA-based handshake we've been doing until now.
Implements the second big part of proposal 220; Closes
ticket 15055.
- Clients now support including Ed25519 identity keys in the EXTEND2
cells they generate. By default, this is controlled by a consensus
parameter, currently disabled. You can turn this feature on for
testing by setting ExtendByEd25519ID in your configuration. This
might make your traffic appear different than the traffic
generated by other users, however. Implements part of ticket
15056; part of proposal 220.
- Relays now understand requests to extend to other relays by their
Ed25519 identity keys. When an Ed25519 identity key is included in
an EXTEND2 cell, the relay will only extend the circuit if the
other relay can prove ownership of that identity. Implements part
of ticket 15056; part of proposal 220.
o Major bugfixes (scheduler):
- Actually compare circuit policies in ewma_cmp_cmux(). This bug
caused the channel scheduler to behave more or less randomly,
rather than preferring channels with higher-priority circuits.
Fixes bug 20459; bugfix on 0.2.6.2-alpha.
o Minor features (controller):
- When HSFETCH arguments cannot be parsed, say "Invalid argument"
rather than "unrecognized." Closes ticket 20389; patch from
Ivan Markin.
o Minor features (diagnostic, directory client):
- Warn when we find an unexpected inconsistency in directory
download status objects. Prevents some negative consequences of
bug 20593.
o Minor features (directory authority):
- Add a new authority-only AuthDirTestEd25519LinkKeys option (on by
default) to control whether authorities should try to probe relays
by their Ed25519 link keys. This option will go away in a few
releases--unless we encounter major trouble in our ed25519 link
protocol rollout, in which case it will serve as a safety option.
o Minor features (directory cache):
- Relays and bridges will now refuse to serve the consensus they
have if they know it is too old for a client to use. Closes
ticket 20511.
o Minor features (ed25519 link handshake):
- Advertise support for the ed25519 link handshake using the
subprotocol-versions mechanism, so that clients can tell which
relays can identity themselves by Ed25519 ID. Closes ticket 20552.
o Minor features (fingerprinting resistance, authentication):
- Extend the length of RSA keys used for TLS link authentication to
2048 bits. (These weren't used for forward secrecy; for forward
secrecy, we used P256.) Closes ticket 13752.
o Minor features (infrastructure):
- Implement smartlist_add_strdup() function. Replaces the use of
smartlist_add(sl, tor_strdup(str)). Closes ticket 20048.
o Minor bugfixes (client):
- When clients that use bridges start up with a cached consensus on
disk, they were ignoring it and downloading a new one. Now they
use the cached one. Fixes bug 20269; bugfix on 0.2.3.12-alpha.
o Minor bugfixes (configuration):
- Accept non-space whitespace characters after the severity level in
the `Log` option. Fixes bug 19965; bugfix on 0.2.1.1-alpha.
- Support "TByte" and "TBytes" units in options given in bytes.
"TB", "terabyte(s)", "TBit(s)" and "terabit(s)" were already
supported. Fixes bug 20622; bugfix on 0.2.0.14-alpha.
o Minor bugfixes (consensus weight):
- Add new consensus method that initializes bw weights to 1 instead
of 0. This prevents a zero weight from making it all the way to
the end (happens in small testing networks) and causing an error.
Fixes bug 14881; bugfix on 0.2.2.17-alpha.
o Minor bugfixes (descriptors):
- Correctly recognise downloaded full descriptors as valid, even
when using microdescriptors as circuits. This affects clients with
FetchUselessDescriptors set, and may affect directory authorities.
Fixes bug 20839; bugfix on 0.2.3.2-alpha.
o Minor bugfixes (directory system):
- Download all consensus flavors, descriptors, and authority
certificates when FetchUselessDescriptors is set, regardless of
whether tor is a directory cache or not. Fixes bug 20667; bugfix
on all recent tor versions.
- Bridges and relays now use microdescriptors (like clients do)
rather than old-style router descriptors. Now bridges will blend
in with clients in terms of the circuits they build. Fixes bug
6769; bugfix on 0.2.3.2-alpha.
o Minor bugfixes (ed25519 certificates):
- Correctly interpret ed25519 certificates that would expire some
time after 19 Jan 2038. Fixes bug 20027; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (hidden services):
- Stop ignoring misconfigured hidden services. Instead, refuse to
start tor until the misconfigurations have been corrected. Fixes
bug 20559; bugfix on multiple commits in 0.2.7.1-alpha
and earlier.
o Minor bugfixes (memory leak at exit):
- Fix a small harmless memory leak at exit of the previously unused
RSA->Ed identity cross-certificate. Fixes bug 17779; bugfix
on 0.2.7.2-alpha.
o Minor bugfixes (util):
- When finishing writing a file to disk, if we were about to replace
the file with the temporary file created before and we fail to
replace it, remove the temporary file so it doesn't stay on disk.
Fixes bug 20646; bugfix on 0.2.0.7-alpha. Patch by fk.
o Minor bugfixes (Windows):
- Check for getpagesize before using it to mmap files. This fixes
compilation in some MinGW environments. Fixes bug 20530; bugfix on
0.1.2.1-alpha. Reported by "ice".
o Code simplification and refactoring:
- Abolish all global guard context in entrynodes.c; replace with new
guard_selection_t structure as preparation for proposal 271.
Closes ticket 19858.
- Introduce rend_service_is_ephemeral() that tells if given onion
service is ephemeral. Replace unclear NULL-checkings for service
directory with this function. Closes ticket 20526.
- Extract magic numbers in circuituse.c into defined variables.
- Refactor circuit_is_available_for_use to remove unnecessary check.
- Refactor circuit_predict_and_launch_new for readability and
testability. Closes ticket 18873.
- Refactor large if statement in purpose_needs_anonymity to use
switch statement instead. Closes part of ticket 20077.
- Refactor the hashing API to return negative values for errors, as
is done as throughout the codebase. Closes ticket 20717.
- Remove data structures that were used to index or_connection
objects by their RSA identity digests. These structures are fully
redundant with the similar structures used in the
channel abstraction.
- Remove duplicate code in the channel_write_*cell() functions.
Closes ticket 13827; patch from Pingl.
- Remove redundant behavior of is_sensitive_dir_purpose, refactor to
use only purpose_needs_anonymity. Closes part of ticket 20077.
- The code to generate and parse EXTEND and EXTEND2 cells has been
replaced with code automatically generated by the
"trunnel" utility.
o Documentation:
- Include the "TBits" unit in Tor's man page. Fixes part of bug
20622; bugfix on 0.2.5.1-alpha.
- Change '1' to 'weight_scale' in consensus bw weights calculation
comments, as that is reality. Closes ticket 20273. Patch
from pastly.
- Correct the value for AuthDirGuardBWGuarantee in the manpage, from
250 KBytes to 2 MBytes. Fixes bug 20435; bugfix
on 0.2.5.6-alpha.
- Stop the man page from incorrectly stating that HiddenServiceDir
must already exist. Fixes 20486.
- Clarify that when ClientRejectInternalAddresses is enabled (which
is the default), multicast DNS hostnames for machines on the local
network (of the form *.local) are also rejected. Closes
ticket 17070.
o Removed features:
- The AuthDirMaxServersPerAuthAddr option no longer exists: The same
limit for relays running on a single IP applies to authority IP
addresses as well as to non-authority IP addresses. Closes
ticket 20960.
- The UseDirectoryGuards torrc option no longer exists: all users
that use entry guards will also use directory guards. Related to
proposal 271; implements part of ticket 20831.
o Testing:
- New unit tests for tor_htonll(). Closes ticket 19563. Patch
from "overcaffeinated".
- Perform the coding style checks when running the tests and fail
when coding style violations are found. Closes ticket 5500.
- Add tests for networkstatus_compute_bw_weights_v10.
- Add unit tests circuit_predict_and_launch_new.
- Extract dummy_origin_circuit_new so it can be used by other
test functions.
Changes in version 0.2.8.12 - 2016-12-19
Tor 0.2.8.12 backports a fix for a medium-severity issue (bug 21018
below) where Tor clients could crash when attempting to visit a
hostile hidden service. Clients are recommended to upgrade as packages
become available for their systems.
It also includes an updated list of fallback directories, backported
from 0.2.9.
Now that the Tor 0.2.9 series is stable, only major bugfixes will be
backported to 0.2.8 in the future.
o Major bugfixes (parsing, security, backported from 0.2.9.8):
- Fix a bug in parsing that could cause clients to read a single
byte past the end of an allocated region. This bug could be used
to cause hardened clients (built with --enable-expensive-hardening)
to crash if they tried to visit a hostile hidden service. Non-
hardened clients are only affected depending on the details of
their platform's memory allocator. Fixes bug 21018; bugfix on
0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
2016-12-002 and as CVE-2016-1254.
o Minor features (fallback directory list, backported from 0.2.9.8):
- Replace the 81 remaining fallbacks of the 100 originally
introduced in Tor 0.2.8.3-alpha in March 2016, with a list of 177
fallbacks (123 new, 54 existing, 27 removed) generated in December
2016. Resolves ticket 20170.
o Minor features (geoip, backported from 0.2.9.7-rc):
- Update geoip and geoip6 to the December 7 2016 Maxmind GeoLite2
Country database.
Changes in version 0.2.9.8 - 2016-12-19
Tor 0.2.9.8 is the first stable release of the Tor 0.2.9 series.
The Tor 0.2.9 series makes mandatory a number of security features
that were formerly optional. It includes support for a new shared-
randomness protocol that will form the basis for next generation
hidden services, includes a single-hop hidden service mode for
optimizing .onion services that don't actually want to be hidden,
tries harder not to overload the directory authorities with excessive
downloads, and supports a better protocol versioning scheme for
improved compatibility with other implementations of the Tor protocol.
And of course, there are numerous other bugfixes and improvements.
This release also includes a fix for a medium-severity issue (bug
21018 below) where Tor clients could crash when attempting to visit a
hostile hidden service. Clients are recommended to upgrade as packages
become available for their systems.
Below are the changes since 0.2.9.7-rc. For a list of all changes
since 0.2.8, see the ReleaseNotes file.
o Major bugfixes (parsing, security):
- Fix a bug in parsing that could cause clients to read a single
byte past the end of an allocated region. This bug could be used
to cause hardened clients (built with --enable-expensive-hardening)
to crash if they tried to visit a hostile hidden service. Non-
hardened clients are only affected depending on the details of
their platform's memory allocator. Fixes bug 21018; bugfix on
0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
2016-12-002 and as CVE-2016-1254.
o Minor features (fallback directory list):
- Replace the 81 remaining fallbacks of the 100 originally
introduced in Tor 0.2.8.3-alpha in March 2016, with a list of 177
fallbacks (123 new, 54 existing, 27 removed) generated in December
2016. Resolves ticket 20170.
Changes in version 0.2.9.7-rc - 2016-12-12
Tor 0.2.9.7-rc fixes a few small bugs remaining in Tor 0.2.9.6-rc,
including a few that had prevented tests from passing on
some platforms.
o Minor features (geoip):
- Update geoip and geoip6 to the December 7 2016 Maxmind GeoLite2
Country database.
o Minor bugfix (build):
- The current Git revision when building from a local repository is
now detected correctly when using git worktrees. Fixes bug 20492;
bugfix on 0.2.3.9-alpha.
o Minor bugfixes (directory authority):
- When computing old Tor protocol line version in protover, we were
looking at 0.2.7.5 twice instead of a specific case for
0.2.9.1-alpha. Fixes bug 20810; bugfix on 0.2.9.4-alpha.
o Minor bugfixes (download scheduling):
- Resolve a "bug" warning when considering a download schedule whose
delay had approached INT_MAX. Fixes 20875; bugfix on 0.2.9.5-alpha.
o Minor bugfixes (logging):
- Downgrade a harmless log message about the
pending_entry_connections list from "warn" to "info". Mitigates
bug 19926.
o Minor bugfixes (memory leak):
- Fix a small memory leak when receiving AF_UNIX connections on a
SocksPort. Fixes bug 20716; bugfix on 0.2.6.3-alpha.
- When moving a signed descriptor object from a source to an
existing destination, free the allocated memory inside that
destination object. Fixes bug 20715; bugfix on 0.2.8.3-alpha.
o Minor bugfixes (memory leak, use-after-free, linux seccomp2 sandbox):
- Fix a memory leak and use-after-free error when removing entries
from the sandbox's getaddrinfo() cache. Fixes bug 20710; bugfix on
0.2.5.5-alpha. Patch from "cypherpunks".
o Minor bugfixes (portability):
- Use the correct spelling of MAC_OS_X_VERSION_10_12 on configure.ac
Fixes bug 20935; bugfix on 0.2.9.6-rc.
o Minor bugfixes (unit tests):
- Stop expecting NetBSD unit tests to report success for ipfw. Part
of a fix for bug 19960; bugfix on 0.2.9.5-alpha.
- Fix tolerances in unit tests for monotonic time comparisons
between nanoseconds and microseconds. Previously, we accepted a 10
us difference only, which is not realistic on every platform's
clock_gettime(). Fixes bug 19974; bugfix on 0.2.9.1-alpha.
- Remove a double-free in the single onion service unit test. Stop
ignoring a return value. Make future changes less error-prone.
Fixes bug 20864; bugfix on 0.2.9.6-rc.
Changes in version 0.2.8.11 - 2016-12-08
Tor 0.2.8.11 backports fixes for additional portability issues that
could prevent Tor from building correctly on OSX Sierra, or with
OpenSSL 1.1. Affected users should upgrade; others can safely stay
with 0.2.8.10.
o Minor bugfixes (portability):
- Avoid compilation errors when building on OSX Sierra. Sierra began
to support the getentropy() and clock_gettime() APIs, but created
a few problems in doing so. Tor 0.2.9 has a more thorough set of
workarounds; in 0.2.8, we are just using the /dev/urandom and mach
monotonic time interfaces. Fixes bug 20865. Bugfix
on 0.2.8.1-alpha.
o Minor bugfixes (portability, backport from 0.2.9.5-alpha):
- Fix compilation with OpenSSL 1.1 and less commonly-used CPU
architectures. Closes ticket 20588.
Changes in version 0.2.8.10 - 2016-12-02
Tor 0.2.8.10 backports a fix for a bug that would sometimes make clients
unusable after they left standby mode. It also backports fixes for
a few portability issues and a small but problematic memory leak.
o Major bugfixes (client reliability, backport from 0.2.9.5-alpha):
- When Tor leaves standby because of a new application request, open
circuits as needed to serve that request. Previously, we would
potentially wait a very long time. Fixes part of bug 19969; bugfix
on 0.2.8.1-alpha.
o Major bugfixes (client performance, backport from 0.2.9.5-alpha):
- Clients now respond to new application stream requests immediately
when they arrive, rather than waiting up to one second before
starting to handle them. Fixes part of bug 19969; bugfix
on 0.2.8.1-alpha.
o Minor bugfixes (portability, backport from 0.2.9.6-rc):
- Work around a bug in the OSX 10.12 SDK that would prevent us from
successfully targeting earlier versions of OSX. Resolves
ticket 20235.
o Minor bugfixes (portability, backport from 0.2.9.5-alpha):
- Fix implicit conversion warnings under OpenSSL 1.1. Fixes bug
20551; bugfix on 0.2.1.1-alpha.
o Minor bugfixes (relay, backport from 0.2.9.5-alpha):
- Work around a memory leak in OpenSSL 1.1 when encoding public
keys. Fixes bug 20553; bugfix on 0.0.2pre8.
o Minor features (geoip):
- Update geoip and geoip6 to the November 3 2016 Maxmind GeoLite2
Country database.
Changes in version 0.2.9.6-rc - 2016-12-02
Tor 0.2.9.6-rc fixes a few remaining bugs found in the previous alpha
version. We hope that it will be ready to become stable soon, and we
encourage everyone to test this release. If no showstopper bugs are
found here, the next 0.2.9 release will be stable.
o Major bugfixes (relay, resolver, logging):
- For relays that don't know their own address, avoid attempting a
local hostname resolve for each descriptor we download. This
will cut down on the number of "Success: chose address 'x.x.x.x'"
log lines, and also avoid confusing clock jumps if the resolver
is slow. Fixes bugs 20423 and 20610; bugfix on 0.2.8.1-alpha.
o Minor bugfixes (client, fascistfirewall):
- Avoid spurious warnings when ReachableAddresses or FascistFirewall
is set. Fixes bug 20306; bugfix on 0.2.8.2-alpha.
o Minor bugfixes (hidden services):
- Stop ignoring the anonymity status of saved keys for hidden
services and single onion services when first starting tor.
Instead, refuse to start tor if any hidden service key has been
used in a different hidden service anonymity mode. Fixes bug
20638; bugfix on 17178 in 0.2.9.3-alpha; reported by ahf.
o Minor bugfixes (portability):
- Work around a bug in the OSX 10.12 SDK that would prevent us from
successfully targeting earlier versions of OSX. Resolves
ticket 20235.
- Run correctly when built on Windows build environments that
require _vcsprintf(). Fixes bug 20560; bugfix on 0.2.2.11-alpha.
o Minor bugfixes (single onion services, Tor2web):
- Stop complaining about long-term one-hop circuits deliberately
created by single onion services and Tor2web. These log messages
are intended to diagnose issue 8387, which relates to circuits
hanging around forever for no reason. Fixes bug 20613; bugfix on
0.2.9.1-alpha. Reported by "pastly".
o Minor bugfixes (unit tests):
- Stop spurious failures in the local interface address discovery
unit tests. Fixes bug 20634; bugfix on 0.2.8.1-alpha; patch by
Neel Chauhan.
o Documentation:
- Correct the minimum bandwidth value in torrc.sample, and queue a
corresponding change for torrc.minimal. Closes ticket 20085.
Changes in version 0.2.9.5-alpha - 2016-11-08
Tor 0.2.9.5-alpha fixes numerous bugs discovered in the previous alpha
version. We believe one or two probably remain, and we encourage
everyone to test this release.
o Major bugfixes (client performance):
- Clients now respond to new application stream requests immediately
when they arrive, rather than waiting up to one second before
starting to handle them. Fixes part of bug 19969; bugfix
on 0.2.8.1-alpha.
o Major bugfixes (client reliability):
- When Tor leaves standby because of a new application request, open
circuits as needed to serve that request. Previously, we would
potentially wait a very long time. Fixes part of bug 19969; bugfix
on 0.2.8.1-alpha.
o Major bugfixes (download scheduling):
- When using an exponential backoff schedule, do not give up on
downloading just because we have failed a bunch of times. Since
each delay is longer than the last, retrying indefinitely won't
hurt. Fixes bug 20536; bugfix on 0.2.9.1-alpha.
- If a consensus expires while we are waiting for certificates to
download, stop waiting for certificates.
- If we stop waiting for certificates less than a minute after we
started downloading them, do not consider the certificate download
failure a separate failure. Fixes bug 20533; bugfix
on 0.2.0.9-alpha.
- Remove the maximum delay on exponential-backoff scheduling. Since
we now allow an infinite number of failures (see ticket 20536), we
must now allow the time to grow longer on each failure. Fixes part
of bug 20534; bugfix on 0.2.9.1-alpha.
- Make our initial download delays closer to those from 0.2.8. Fixes
another part of bug 20534; bugfix on 0.2.9.1-alpha.
- When determining when to download a directory object, handle times
after 2038 if the operating system supports them. (Someday this
will be important!) Fixes bug 20587; bugfix on 0.2.8.1-alpha.
- When using exponential backoff in test networks, use a lower
exponent, so the delays do not vary as much. This helps test
networks bootstrap consistently. Fixes bug 20597; bugfix on 20499.
o Minor features (geoip):
- Update geoip and geoip6 to the November 3 2016 Maxmind GeoLite2
Country database.
o Minor bugfixes (client directory scheduling):
- Treat "relay too busy to answer request" as a failed request and a
reason to back off on our retry frequency. This is safe now that
exponential backoffs retry indefinitely, and avoids a bug where we
would reset our download schedule erroneously. Fixes bug 20593;
bugfix on 0.2.9.1-alpha.
o Minor bugfixes (client, logging):
- Remove a BUG warning in circuit_pick_extend_handshake(). Instead,
assume all nodes support EXTEND2. Use ntor whenever a key is
available. Fixes bug 20472; bugfix on 0.2.9.3-alpha.
- On DNSPort, stop logging a BUG warning on a failed hostname
lookup. Fixes bug 19869; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (hidden services):
- When configuring hidden services, check every hidden service
directory's permissions. Previously, we only checked the last
hidden service. Fixes bug 20529; bugfix the work to fix 13942
in 0.2.6.2-alpha.
o Minor bugfixes (portability):
- Fix compilation with OpenSSL 1.1 and less commonly-used CPU
architectures. Closes ticket 20588.
- Use ECDHE ciphers instead of ECDH in tortls tests. LibreSSL has
removed the ECDH ciphers which caused the tests to fail on
platforms which use it. Fixes bug 20460; bugfix on 0.2.8.1-alpha.
- Fix implicit conversion warnings under OpenSSL 1.1. Fixes bug
20551; bugfix on 0.2.1.1-alpha.
o Minor bugfixes (relay bootstrap):
- Ensure relays don't make multiple connections during bootstrap.
Fixes bug 20591; bugfix on 0.2.8.1-alpha.
o Minor bugfixes (relay):
- Work around a memory leak in OpenSSL 1.1 when encoding public
keys. Fixes bug 20553; bugfix on 0.0.2pre8.
- Avoid a small memory leak when informing worker threads about
rotated onion keys. Fixes bug 20401; bugfix on 0.2.6.3-alpha.
- Do not try to parallelize workers more than 16x without the user
explicitly configuring us to do so, even if we do detect more than
16 CPU cores. Fixes bug 19968; bugfix on 0.2.3.1-alpha.
o Minor bugfixes (single onion services):
- Start correctly when creating a single onion service in a
directory that did not previously exist. Fixes bug 20484; bugfix
on 0.2.9.3-alpha.
o Minor bugfixes (testing):
- Avoid a unit test failure on systems with over 16 detectable CPU
cores. Fixes bug 19968; bugfix on 0.2.3.1-alpha.
o Documentation:
- Clarify that setting HiddenServiceNonAnonymousMode requires you to
also set "SOCKSPort 0". Fixes bug 20487; bugfix on 0.2.9.3-alpha.
- Module-level documentation for several more modules. Closes
tickets 19287 and 19290.
Changes in version 0.2.8.9 - 2016-10-17
Tor 0.2.8.9 backports a fix for a security hole in previous versions
of Tor that would allow a remote attacker to crash a Tor client,
hidden service, relay, or authority. All Tor users should upgrade to
this version, or to 0.2.9.4-alpha. Patches will be released for older
versions of Tor.
o Major features (security fixes, also in 0.2.9.4-alpha):
- Prevent a class of security bugs caused by treating the contents
of a buffer chunk as if they were a NUL-terminated string. At
least one such bug seems to be present in all currently used
versions of Tor, and would allow an attacker to remotely crash
most Tor instances, especially those compiled with extra compiler
hardening. With this defense in place, such bugs can't crash Tor,
though we should still fix them as they occur. Closes ticket
20384 (TROVE-2016-10-001).
o Minor features (geoip):
- Update geoip and geoip6 to the October 4 2016 Maxmind GeoLite2
Country database.
Changes in version 0.2.9.4-alpha - 2016-10-17
Tor 0.2.9.4-alpha fixes a security hole in previous versions of Tor
that would allow a remote attacker to crash a Tor client, hidden
service, relay, or authority. All Tor users should upgrade to this
version, or to 0.2.8.9. Patches will be released for older versions
of Tor.
Tor 0.2.9.4-alpha also adds numerous small features and fix-ups to
previous versions of Tor, including the implementation of a feature to
future- proof the Tor ecosystem against protocol changes, some bug
fixes necessary for Tor Browser to use unix domain sockets correctly,
and several portability improvements. We anticipate that this will be
the last alpha in the Tor 0.2.9 series, and that the next release will
be a release candidate.
o Major features (security fixes):
- Prevent a class of security bugs caused by treating the contents
of a buffer chunk as if they were a NUL-terminated string. At
least one such bug seems to be present in all currently used
versions of Tor, and would allow an attacker to remotely crash
most Tor instances, especially those compiled with extra compiler
hardening. With this defense in place, such bugs can't crash Tor,
though we should still fix them as they occur. Closes ticket
20384 (TROVE-2016-10-001).
o Major features (subprotocol versions):
- Tor directory authorities now vote on a set of recommended
subprotocol versions, and on a set of required subprotocol
versions. Clients and relays that lack support for a _required_
subprotocol version will not start; those that lack support for a
_recommended_ subprotocol version will warn the user to upgrade.
Closes ticket 19958; implements part of proposal 264.
- Tor now uses "subprotocol versions" to indicate compatibility.
Previously, versions of Tor looked at the declared Tor version of
a relay to tell whether they could use a given feature. Now, they
should be able to rely on its declared subprotocol versions. This
change allows compatible implementations of the Tor protocol(s) to
exist without pretending to be 100% bug-compatible with particular
releases of Tor itself. Closes ticket 19958; implements part of
proposal 264.
o Minor feature (fallback directories):
- Remove broken fallbacks from the hard-coded fallback directory
list. Closes ticket 20190; patch by teor.
o Minor features (client, directory):
- Since authorities now omit all routers that lack the Running and
Valid flags, we assume that any relay listed in the consensus must
have those flags. Closes ticket 20001; implements part of
proposal 272.
o Minor features (compilation, portability):
- Compile correctly on MacOS 10.12 (aka "Sierra"). Closes
ticket 20241.
o Minor features (development tools, etags):
- Teach the "make tags" Makefile target how to correctly find
"MOCK_IMPL" function definitions. Patch from nherring; closes
ticket 16869.
o Minor features (geoip):
- Update geoip and geoip6 to the October 4 2016 Maxmind GeoLite2
Country database.
o Minor features (unix domain sockets):
- When configuring a unix domain socket for a SocksPort,
ControlPort, or Hidden service, you can now wrap the address in
quotes, using C-style escapes inside the quotes. This allows unix
domain socket paths to contain spaces.
o Minor features (virtual addresses):
- Increase the maximum number of bits for the IPv6 virtual network
prefix from 16 to 104. In this way, the condition for address
allocation is less restrictive. Closes ticket 20151; feature
on 0.2.4.7-alpha.
o Minor bugfixes (address discovery):
- Stop reordering IP addresses returned by the OS. This makes it
more likely that Tor will guess the same relay IP address every
time. Fixes issue 20163; bugfix on 0.2.7.1-alpha, ticket 17027.
Reported by René Mayrhofer, patch by "cypherpunks".
o Minor bugfixes (client, unix domain sockets):
- Disable IsolateClientAddr when using AF_UNIX backed SocksPorts as
the client address is meaningless. Fixes bug 20261; bugfix
on 0.2.6.3-alpha.
o Minor bugfixes (compilation, OpenBSD):
- Detect Libevent2 functions correctly on systems that provide
libevent2, but where libevent1 is linked with -levent. Fixes bug
19904; bugfix on 0.2.2.24-alpha. Patch from Rubiate.
o Minor bugfixes (configuration):
- When parsing quoted configuration values from the torrc file,
handle windows line endings correctly. Fixes bug 19167; bugfix on
0.2.0.16-alpha. Patch from "Pingl".
o Minor bugfixes (getpass):
- Defensively fix a non-triggerable heap corruption at do_getpass()
to protect ourselves from mistakes in the future. Fixes bug
19223; bugfix on 0.2.7.3-rc. Bug found by Guido Vranken, patch
by nherring.
o Minor bugfixes (hidden service):
- Allow hidden services to run on IPv6 addresses even when the
IPv6Exit option is not set. Fixes bug 18357; bugfix
on 0.2.4.7-alpha.
o Documentation:
- Add module-level internal documentation for 36 C files that
previously didn't have a high-level overview. Closes ticket #20385.
o Required libraries:
- When building with OpenSSL, Tor now requires version 1.0.1 or
later. OpenSSL 1.0.0 and earlier are no longer supported by the
OpenSSL team, and should not be used. Closes ticket 20303.
Changes in version 0.2.9.3-alpha - 2016-09-23
Tor 0.2.9.3-alpha adds improved support for entities that want to make
high-performance services available through the Tor .onion mechanism
without themselves receiving anonymity as they host those services. It
also tries harder to ensure that all steps on a circuit are using the
strongest crypto possible, strengthens some TLS properties, and
resolves several bugs -- including a pair of crash bugs from the 0.2.8
series. Anybody running an earlier version of 0.2.9.x should upgrade.
o Major bugfixes (crash, also in 0.2.8.8):
- Fix a complicated crash bug that could affect Tor clients
configured to use bridges when replacing a networkstatus consensus
in which one of their bridges was mentioned. OpenBSD users saw
more crashes here, but all platforms were potentially affected.
Fixes bug 20103; bugfix on 0.2.8.2-alpha.
o Major bugfixes (relay, OOM handler, also in 0.2.8.8):
- Fix a timing-dependent assertion failure that could occur when we
tried to flush from a circuit after having freed its cells because
of an out-of-memory condition. Fixes bug 20203; bugfix on
0.2.8.1-alpha. Thanks to "cypherpunks" for help diagnosing
this one.
o Major features (circuit building, security):
- Authorities, relays and clients now require ntor keys in all
descriptors, for all hops (except for rare hidden service protocol
cases), for all circuits, and for all other roles. Part of
ticket 19163.
- Tor authorities, relays, and clients only use ntor, except for
rare cases in the hidden service protocol. Part of ticket 19163.
o Major features (single-hop "hidden" services):
- Add experimental HiddenServiceSingleHopMode and
HiddenServiceNonAnonymousMode options. When both are set to 1,
every hidden service on a Tor instance becomes a non-anonymous
Single Onion Service. Single Onions make one-hop (direct)
connections to their introduction and rendezvous points. One-hop
circuits make Single Onion servers easily locatable, but clients
remain location-anonymous. This is compatible with the existing
hidden service implementation, and works on the current tor
network without any changes to older relays or clients. Implements
proposal 260, completes ticket 17178. Patch by teor and asn.
o Major features (resource management):
- Tor can now notice it is about to run out of sockets, and
preemptively close connections of lower priority. (This feature is
off by default for now, since the current prioritizing method is
yet not mature enough. You can enable it by setting
"DisableOOSCheck 0", but watch out: it might close some sockets
you would rather have it keep.) Closes ticket 18640.
o Major bugfixes (circuit building):
- Hidden service client-to-intro-point and service-to-rendezvous-
point circuits use the TAP key supplied by the protocol, to avoid
epistemic attacks. Fixes bug 19163; bugfix on 0.2.4.18-rc.
o Major bugfixes (compilation, OpenBSD):
- Fix a Libevent-detection bug in our autoconf script that would
prevent Tor from linking successfully on OpenBSD. Patch from
rubiate. Fixes bug 19902; bugfix on 0.2.9.1-alpha.
o Major bugfixes (hidden services):
- Clients now require hidden services to include the TAP keys for
their intro points in the hidden service descriptor. This prevents
an inadvertent upgrade to ntor, which a malicious hidden service
could use to distinguish clients by consensus version. Fixes bug
20012; bugfix on 0.2.4.8-alpha. Patch by teor.
o Minor features (security, TLS):
- Servers no longer support clients that without AES ciphersuites.
(3DES is no longer considered an acceptable cipher.) We believe
that no such Tor clients currently exist, since Tor has required
OpenSSL 0.9.7 or later since 2009. Closes ticket 19998.
o Minor feature (fallback directories):
- Remove 8 fallbacks that are no longer suitable, leaving 81 of the
100 fallbacks originally introduced in Tor 0.2.8.2-alpha in March
2016. Closes ticket 20190; patch by teor.
o Minor features (geoip, also in 0.2.8.8):
- Update geoip and geoip6 to the September 6 2016 Maxmind GeoLite2
Country database.
o Minor feature (port flags):
- Add new flags to the *Port options to finer control over which
requests are allowed. The flags are NoDNSRequest, NoOnionTraffic,
and the synthetic flag OnionTrafficOnly, which is equivalent to
NoDNSRequest, NoIPv4Traffic, and NoIPv6Traffic. Closes enhancement
18693; patch by "teor".
o Minor features (directory authority):
- After voting, if the authorities decide that a relay is not
"Valid", they no longer include it in the consensus at all. Closes
ticket 20002; implements part of proposal 272.
o Minor features (testing):
- Disable memory protections on OpenBSD when performing our unit
tests for memwipe(). The test deliberately invokes undefined
behavior, and the OpenBSD protections interfere with this. Patch
from "rubiate". Closes ticket 20066.
o Minor features (testing, ipv6):
- Add the single-onion and single-onion-ipv6 chutney targets to
"make test-network-all". This requires a recent chutney version
with the single onion network flavours (git c72a652 or later).
Closes ticket 20072; patch by teor.
- Add the hs-ipv6 chutney target to make test-network-all's IPv6
tests. Remove bridges+hs, as it's somewhat redundant. This
requires a recent chutney version that supports IPv6 clients,
relays, and authorities. Closes ticket 20069; patch by teor.
o Minor features (Tor2web):
- Make Tor2web clients respect ReachableAddresses. This feature was
inadvertently enabled in 0.2.8.6, then removed by bugfix 19973 on
0.2.8.7. Implements feature 20034. Patch by teor.
o Minor features (unit tests):
- We've done significant work to make the unit tests run faster.
- Our link-handshake unit tests now check that when invalid
handshakes fail, they fail with the error messages we expected.
- Our unit testing code that captures log messages no longer
prevents them from being written out if the user asked for them
(by passing --debug or --info or or --notice --warn to the "test"
binary). This change prevents us from missing unexpected log
messages simply because we were looking for others. Related to
ticket 19999.
- The unit tests now log all warning messages with the "BUG" flag.
Previously, they only logged errors by default. This change will
help us make our testing code more correct, and make sure that we
only hit this code when we mean to. In the meantime, however,
there will be more warnings in the unit test logs than before.
This is preparatory work for ticket 19999.
- The unit tests now treat any failure of a "tor_assert_nonfatal()"
assertion as a test failure.
o Minor bug fixes (circuits):
- Use the CircuitBuildTimeout option whenever
LearnCircuitBuildTimeout is disabled. Previously, we would respect
the option when a user disabled it, but not when it was disabled
because some other option was set. Fixes bug 20073; bugfix on
0.2.4.12-alpha. Patch by teor.
o Minor bugfixes (allocation):
- Change how we allocate memory for large chunks on buffers, to
avoid a (currently impossible) integer overflow, and to waste less
space when allocating unusually large chunks. Fixes bug 20081;
bugfix on 0.2.0.16-alpha. Issue identified by Guido Vranken.
- Always include orconfig.h before including any other C headers.
Sometimes, it includes macros that affect the behavior of the
standard headers. Fixes bug 19767; bugfix on 0.2.9.1-alpha (the
first version to use AC_USE_SYSTEM_EXTENSIONS).
- Fix a syntax error in the IF_BUG_ONCE__() macro in non-GCC-
compatible compilers. Fixes bug 20141; bugfix on 0.2.9.1-alpha.
Patch from Gisle Vanem.
- Stop trying to build with Clang 4.0's -Wthread-safety warnings.
They apparently require a set of annotations that we aren't
currently using, and they create false positives in our pthreads
wrappers. Fixes bug 20110; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (directory authority):
- Die with a more useful error when the operator forgets to place
the authority_signing_key file into the keys directory. This
avoids an uninformative assert & traceback about having an invalid
key. Fixes bug 20065; bugfix on 0.2.0.1-alpha.
- When allowing private addresses, mark Exits that only exit to
private locations as such. Fixes bug 20064; bugfix
on 0.2.2.9-alpha.
o Minor bugfixes (documentation):
- Document the default PathsNeededToBuildCircuits value that's used
by clients when the directory authorities don't set
min_paths_for_circs_pct. Fixes bug 20117; bugfix on 02c320916e02
in 0.2.4.10-alpha. Patch by teor, reported by Jesse V.
- Fix manual for the User option: it takes a username, not a UID.
Fixes bug 19122; bugfix on 0.0.2pre16 (the first version to have
a manpage!).
o Minor bugfixes (hidden services):
- Stop logging intro point details to the client log on certain
error conditions. Fixed as part of bug 20012; bugfix on
0.2.4.8-alpha. Patch by teor.
o Minor bugfixes (IPv6, testing):
- Check for IPv6 correctly on Linux when running test networks.
Fixes bug 19905; bugfix on 0.2.7.3-rc; patch by teor.
o Minor bugfixes (Linux seccomp2 sandbox):
- Add permission to run the sched_yield() and sigaltstack() system
calls, in order to support versions of Tor compiled with asan or
ubsan code that use these calls. Now "sandbox 1" and
"--enable-expensive-hardening" should be compatible on more
systems. Fixes bug 20063; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (logging):
- When logging a message from the BUG() macro, be explicit about
what we were asserting. Previously we were confusing what we were
asserting with what the bug was. Fixes bug 20093; bugfix
on 0.2.9.1-alpha.
- When we are unable to remove the bw_accounting file, do not warn
if the reason we couldn't remove it was that it didn't exist.
Fixes bug 19964; bugfix on 0.2.5.4-alpha. Patch from 'pastly'.
o Minor bugfixes (option parsing):
- Count unix sockets when counting client listeners (SOCKS, Trans,
NATD, and DNS). This has no user-visible behaviour changes: these
options are set once, and never read. Required for correct
behaviour in ticket 17178. Fixes bug 19677; bugfix on
0.2.6.3-alpha. Patch by teor.
o Minor bugfixes (options):
- Check the consistency of UseEntryGuards and EntryNodes more
reliably. Fixes bug 20074; bugfix on 0.2.4.12-alpha. Patch
by teor.
- Stop changing the configured value of UseEntryGuards on
authorities and Tor2web clients. Fixes bug 20074; bugfix on
commits 51fc6799 in 0.1.1.16-rc and acda1735 in 0.2.4.3-alpha.
Patch by teor.
o Minor bugfixes (Tor2web):
- Prevent Tor2web clients running hidden services, these services
are not anonymous due to the one-hop client paths. Fixes bug
19678. Patch by teor.
o Minor bugfixes (unit tests):
- Fix a shared-random unit test that was failing on big endian
architectures due to internal representation of a integer copied
to a buffer. The test is changed to take a full 32 bytes of data
and use the output of a python script that make the COMMIT and
REVEAL calculation according to the spec. Fixes bug 19977; bugfix
on 0.2.9.1-alpha.
- The tor_tls_server_info_callback unit test no longer crashes when
debug-level logging is turned on. Fixes bug 20041; bugfix
on 0.2.8.1-alpha.
Changes in version 0.2.8.8 - 2016-09-23
Tor 0.2.8.8 fixes two crash bugs present in previous versions of the
0.2.8.x series. Relays running 0.2.8.x should upgrade, as should users
who select public relays as their bridges.
o Major bugfixes (crash):
- Fix a complicated crash bug that could affect Tor clients
configured to use bridges when replacing a networkstatus consensus
in which one of their bridges was mentioned. OpenBSD users saw
more crashes here, but all platforms were potentially affected.
Fixes bug 20103; bugfix on 0.2.8.2-alpha.
o Major bugfixes (relay, OOM handler):
- Fix a timing-dependent assertion failure that could occur when we
tried to flush from a circuit after having freed its cells because
of an out-of-memory condition. Fixes bug 20203; bugfix on
0.2.8.1-alpha. Thanks to "cypherpunks" for help diagnosing
this one.
o Minor feature (fallback directories):
- Remove 8 fallbacks that are no longer suitable, leaving 81 of the
100 fallbacks originally introduced in Tor 0.2.8.2-alpha in March
2016. Closes ticket 20190; patch by teor.
o Minor features (geoip):
- Update geoip and geoip6 to the September 6 2016 Maxmind GeoLite2
Country database.
Changes in version 0.2.9.2-alpha - 2016-08-24
Tor 0.2.9.2-alpha continues development of the 0.2.9 series with
several new features and bugfixes. It also includes an important
authority update and an important bugfix from 0.2.8.7. Everyone who
sets the ReachableAddresses option, and all bridges, are strongly
encouraged to upgrade to 0.2.8.7, or to 0.2.9.2-alpha.
o Directory authority changes (also in 0.2.8.7):
- The "Tonga" bridge authority has been retired; the new bridge
authority is "Bifroest". Closes tickets 19728 and 19690.
o Major bugfixes (client, security, also in 0.2.8.7):
- Only use the ReachableAddresses option to restrict the first hop
in a path. In earlier versions of 0.2.8.x, it would apply to
every hop in the path, with a possible degradation in anonymity
for anyone using an uncommon ReachableAddress setting. Fixes bug
19973; bugfix on 0.2.8.2-alpha.
o Major features (user interface):
- Tor now supports the ability to declare options deprecated, so
that we can recommend that people stop using them. Previously,
this was done in an ad-hoc way. Closes ticket 19820.
o Major bugfixes (directory downloads):
- Avoid resetting download status for consensuses hourly, since we
already have another, smarter retry mechanism. Fixes bug 8625;
bugfix on 0.2.0.9-alpha.
o Minor features (config):
- Warn users when descriptor and port addresses are inconsistent.
Mitigates bug 13953; patch by teor.
o Minor features (geoip):
- Update geoip and geoip6 to the August 2 2016 Maxmind GeoLite2
Country database.
o Minor features (user interface):
- There is a new --list-deprecated-options command-line option to
list all of the deprecated options. Implemented as part of
ticket 19820.
o Minor bugfixes (code style):
- Fix an integer signedness conversion issue in the case conversion
tables. Fixes bug 19168; bugfix on 0.2.1.11-alpha.
o Minor bugfixes (compilation):
- Build correctly on versions of libevent2 without support for
evutil_secure_rng_add_bytes(). Fixes bug 19904; bugfix
on 0.2.5.4-alpha.
- Fix a compilation warning on GCC versions before 4.6. Our
ENABLE_GCC_WARNING macro used the word "warning" as an argument,
when it is also required as an argument to the compiler pragma.
Fixes bug 19901; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (compilation, also in 0.2.8.7):
- Remove an inappropriate "inline" in tortls.c that was causing
warnings on older versions of GCC. Fixes bug 19903; bugfix
on 0.2.8.1-alpha.
o Minor bugfixes (fallback directories, also in 0.2.8.7):
- Avoid logging a NULL string pointer when loading fallback
directory information. Fixes bug 19947; bugfix on 0.2.4.7-alpha
and 0.2.8.1-alpha. Report and patch by "rubiate".
o Minor bugfixes (logging):
- Log a more accurate message when we fail to dump a microdescriptor.
Fixes bug 17758; bugfix on 0.2.2.8-alpha. Patch from Daniel Pinto.
o Minor bugfixes (memory leak):
- Fix a series of slow memory leaks related to parsing torrc files
and options. Fixes bug 19466; bugfix on 0.2.1.6-alpha.
o Deprecated features:
- A number of DNS-cache-related sub-options for client ports are now
deprecated for security reasons, and may be removed in a future
version of Tor. (We believe that client-side DNS caching is a bad
idea for anonymity, and you should not turn it on.) The options
are: CacheDNS, CacheIPv4DNS, CacheIPv6DNS, UseDNSCache,
UseIPv4Cache, and UseIPv6Cache.
- A number of options are deprecated for security reasons, and may
be removed in a future version of Tor. The options are:
AllowDotExit, AllowInvalidNodes, AllowSingleHopCircuits,
AllowSingleHopExits, ClientDNSRejectInternalAddresses,
CloseHSClientCircuitsImmediatelyOnTimeout,
CloseHSServiceRendCircuitsImmediatelyOnTimeout,
ExcludeSingleHopRelays, FastFirstHopPK, TLSECGroup,
UseNTorHandshake, and WarnUnsafeSocks.
- The *ListenAddress options are now deprecated as unnecessary: the
corresponding *Port options should be used instead. These options
may someday be removed. The affected options are:
ControlListenAddress, DNSListenAddress, DirListenAddress,
NATDListenAddress, ORListenAddress, SocksListenAddress,
and TransListenAddress.
o Documentation:
- Correct the IPv6 syntax in our documentation for the
VirtualAddrNetworkIPv6 torrc option. Closes ticket 19743.
o Removed code:
- We no longer include the (dead, deprecated) bufferevent code in
Tor. Closes ticket 19450. Based on a patch from U+039b.
Changes in version 0.2.8.7 - 2016-08-24
Tor 0.2.8.7 fixes an important bug related to the ReachableAddresses
option in 0.2.8.6, and replaces a retiring bridge authority. Everyone
who sets the ReachableAddresses option, and all bridges, are strongly
encouraged to upgrade.
o Directory authority changes:
- The "Tonga" bridge authority has been retired; the new bridge
authority is "Bifroest". Closes tickets 19728 and 19690.
o Major bugfixes (client, security):
- Only use the ReachableAddresses option to restrict the first hop
in a path. In earlier versions of 0.2.8.x, it would apply to
every hop in the path, with a possible degradation in anonymity
for anyone using an uncommon ReachableAddress setting. Fixes bug
19973; bugfix on 0.2.8.2-alpha.
o Minor features (geoip):
- Update geoip and geoip6 to the August 2 2016 Maxmind GeoLite2
Country database.
o Minor bugfixes (compilation):
- Remove an inappropriate "inline" in tortls.c that was causing
warnings on older versions of GCC. Fixes bug 19903; bugfix
on 0.2.8.1-alpha.
o Minor bugfixes (fallback directories):
- Avoid logging a NULL string pointer when loading fallback
directory information. Fixes bug 19947; bugfix on 0.2.4.7-alpha
and 0.2.8.1-alpha. Report and patch by "rubiate".
Changes in version 0.2.9.1-alpha - 2016-08-08
Tor 0.2.9.1-alpha is the first alpha release in the 0.2.9 development
series. It improves our support for hardened builds and compiler
warnings, deploys some critical infrastructure for improvements to
hidden services, includes a new timing backend that we hope to use for
better support for traffic padding, makes it easier for programmers to
log unexpected events, and contains other small improvements to
security, correctness, and performance.
Below are the changes since 0.2.8.6.
o New system requirements:
- Tor now requires Libevent version 2.0.10-stable or later. Older
versions of Libevent have less efficient backends for several
platforms, and lack the DNS code that we use for our server-side
DNS support. This implements ticket 19554.
- Tor now requires zlib version 1.2 or later, for security,
efficiency, and (eventually) gzip support. (Back when we started,
zlib 1.1 and zlib 1.0 were still found in the wild. 1.2 was
released in 2003. We recommend the latest version.)
o Major features (build, hardening):
- Tor now builds with -ftrapv by default on compilers that support
it. This option detects signed integer overflow (which C forbids),
and turns it into a hard-failure. We do not apply this option to
code that needs to run in constant time to avoid side-channels;
instead, we use -fwrapv in that code. Closes ticket 17983.
- When --enable-expensive-hardening is selected, stop applying the
clang/gcc sanitizers to code that needs to run in constant time.
Although we are aware of no introduced side-channels, we are not
able to prove that there are none. Related to ticket 17983.
o Major features (compilation):
- Our big list of extra GCC warnings is now enabled by default when
building with GCC (or with anything like Clang that claims to be
GCC-compatible). To make all warnings into fatal compilation
errors, pass --enable-fatal-warnings to configure. Closes
ticket 19044.
- Use the Autoconf macro AC_USE_SYSTEM_EXTENSIONS to automatically
turn on C and POSIX extensions. (Previously, we attempted to do
this on an ad hoc basis.) Closes ticket 19139.
o Major features (directory authorities, hidden services):
- Directory authorities can now perform the shared randomness
protocol specified by proposal 250. Using this protocol, directory
authorities generate a global fresh random value every day. In the
future, this value will be used by hidden services to select
HSDirs. This release implements the directory authority feature;
the hidden service side will be implemented in the future as part
of proposal 224. Resolves ticket 16943; implements proposal 250.
o Major features (downloading, random exponential backoff):
- When we fail to download an object from a directory service, wait
for an (exponentially increasing) randomized amount of time before
retrying, rather than a fixed interval as we did before. This
prevents a group of Tor instances from becoming too synchronized,
or a single Tor instance from becoming too predictable, in its
download schedule. Closes ticket 15942.
o Major bugfixes (exit policies):
- Avoid disclosing exit outbound bind addresses, configured port
bind addresses, and local interface addresses in relay descriptors
by default under ExitPolicyRejectPrivate. Instead, only reject
these (otherwise unlisted) addresses if
ExitPolicyRejectLocalInterfaces is set. Fixes bug 18456; bugfix on
0.2.7.2-alpha. Patch by teor.
o Major bugfixes (hidden service client):
- Allow Tor clients with appropriate controllers to work with
FetchHidServDescriptors set to 0. Previously, this option also
disabled descriptor cache lookup, thus breaking hidden services
entirely. Fixes bug 18704; bugfix on 0.2.0.20-rc. Patch by "twim".
o Minor features (build, hardening):
- Detect and work around a libclang_rt problem that would prevent
clang from finding __mulodi4() on some 32-bit platforms, and thus
keep -ftrapv from linking on those systems. Closes ticket 19079.
- When building on a system without runtime support for the runtime
hardening options, try to log a useful warning at configuration
time, rather than an incomprehensible warning at link time. If
expensive hardening was requested, this warning becomes an error.
Closes ticket 18895.
o Minor features (code safety):
- In our integer-parsing functions, ensure that maxiumum value we
give is no smaller than the minimum value. Closes ticket 19063;
patch from U+039b.
o Minor features (controller):
- Implement new GETINFO queries for all downloads that use
download_status_t to schedule retries. This allows controllers to
examine the schedule for pending downloads. Closes ticket 19323.
- Allow controllers to configure basic client authorization on
hidden services when they create them with the ADD_ONION control
command. Implements ticket 15588. Patch by "special".
- Fire a STATUS_SERVER controller event whenever the hibernation
status changes between "awake"/"soft"/"hard". Closes ticket 18685.
o Minor features (directory authority):
- Directory authorities now only give the Guard flag to a relay if
they are also giving it the Stable flag. This change allows us to
simplify path selection for clients. It should have minimal effect
in practice, since >99% of Guards already have the Stable flag.
Implements ticket 18624.
- Directory authorities now write their v3-status-votes file out to
disk earlier in the consensus process, so we have a record of the
votes even if we abort the consensus process. Resolves
ticket 19036.
o Minor features (hidden service):
- Stop being so strict about the payload length of "rendezvous1"
cells. We used to be locked in to the "TAP" handshake length, and
now we can handle better handshakes like "ntor". Resolves
ticket 18998.
o Minor features (infrastructure, time):
- Tor now uses the operating system's monotonic timers (where
available) for internal fine-grained timing. Previously we would
look at the system clock, and then attempt to compensate for the
clock running backwards. Closes ticket 18908.
- Tor now includes an improved timer backend, so that we can
efficiently support tens or hundreds of thousands of concurrent
timers, as will be needed for some of our planned anti-traffic-
analysis work. This code is based on William Ahern's "timeout.c"
project, which implements a "tickless hierarchical timing wheel".
Closes ticket 18365.
o Minor features (logging):
- Provide a more useful warning message when configured with an
invalid Nickname. Closes ticket 18300; patch from "icanhasaccount".
- When dumping unparseable router descriptors, optionally store them
in separate files, named by digest, up to a configurable size
limit. You can change the size limit by setting the
MaxUnparseableDescSizeToLog option, and disable this feature by
setting that option to 0. Closes ticket 18322.
- Add a set of macros to check nonfatal assertions, for internal
use. Migrating more of our checks to these should help us avoid
needless crash bugs. Closes ticket 18613.
o Minor features (performance):
- Change the "optimistic data" extension from "off by default" to
"on by default". The default was ordinarily overridden by a
consensus option, but when clients were bootstrapping for the
first time, they would not have a consensus to get the option
from. Changing this default saves a round-trip during startup.
Closes ticket 18815.
o Minor features (relay, usability):
- When the directory authorities refuse a bad relay's descriptor,
encourage the relay operator to contact us. Many relay operators
won't notice this line in their logs, but it's a win if even a few
learn why we don't like what their relay was doing. Resolves
ticket 18760.
o Minor features (testing):
- Let backtrace tests work correctly under AddressSanitizer. Fixes
part of bug 18934; bugfix on 0.2.5.2-alpha.
- Move the test-network.sh script to chutney, and modify tor's test-
network.sh to call the (newer) chutney version when available.
Resolves ticket 19116. Patch by teor.
- Use the lcov convention for marking lines as unreachable, so that
we don't count them when we're generating test coverage data.
Update our coverage tools to understand this convention. Closes
ticket 16792.
o Minor bugfixes (bootstrap):
- Remember the directory we fetched the consensus or previous
certificates from, and use it to fetch future authority
certificates. This change improves bootstrapping performance.
Fixes bug 18963; bugfix on 0.2.8.1-alpha.
o Minor bugfixes (build):
- The test-stem and test-network makefile targets now depend only on
the tor binary that they are testing. Previously, they depended on
"make all". Fixes bug 18240; bugfix on 0.2.8.2-alpha. Based on a
patch from "cypherpunks".
o Minor bugfixes (circuits):
- Make sure extend_info_from_router() is only called on servers.
Fixes bug 19639; bugfix on 0.2.8.1-alpha.
o Minor bugfixes (compilation):
- When building with Clang, use a full set of GCC warnings.
(Previously, we included only a subset, because of the way we
detected them.) Fixes bug 19216; bugfix on 0.2.0.1-alpha.
o Minor bugfixes (directory authority):
- Authorities now sort the "package" lines in their votes, for ease
of debugging. (They are already sorted in consensus documents.)
Fixes bug 18840; bugfix on 0.2.6.3-alpha.
- When parsing a detached signature, make sure we use the length of
the digest algorithm instead of an hardcoded DIGEST256_LEN in
order to avoid comparing bytes out-of-bounds with a smaller digest
length such as SHA1. Fixes bug 19066; bugfix on 0.2.2.6-alpha.
o Minor bugfixes (documentation):
- Document the --passphrase-fd option in the tor manpage. Fixes bug
19504; bugfix on 0.2.7.3-rc.
- Fix the description of the --passphrase-fd option in the
tor-gencert manpage. The option is used to pass the number of a
file descriptor to read the passphrase from, not to read the file
descriptor from. Fixes bug 19505; bugfix on 0.2.0.20-alpha.
o Minor bugfixes (ephemeral hidden service):
- When deleting an ephemeral hidden service, close its intro points
even if they are not completely open. Fixes bug 18604; bugfix
on 0.2.7.1-alpha.
o Minor bugfixes (guard selection):
- Use a single entry guard even if the NumEntryGuards consensus
parameter is not provided. Fixes bug 17688; bugfix
on 0.2.5.6-alpha.
- Don't mark guards as unreachable if connection_connect() fails.
That function fails for local reasons, so it shouldn't reveal
anything about the status of the guard. Fixes bug 14334; bugfix
on 0.2.3.10-alpha.
o Minor bugfixes (hidden service client):
- Increase the minimum number of internal circuits we preemptively
build from 2 to 3, so a circuit is available when a client
connects to another onion service. Fixes bug 13239; bugfix
on 0.1.0.1-rc.
o Minor bugfixes (logging):
- When logging a directory ownership mismatch, log the owning
username correctly. Fixes bug 19578; bugfix on 0.2.2.29-beta.
o Minor bugfixes (memory leaks):
- Fix a small, uncommon memory leak that could occur when reading a
truncated ed25519 key file. Fixes bug 18956; bugfix
on 0.2.6.1-alpha.
o Minor bugfixes (testing):
- Allow clients to retry HSDirs much faster in test networks. Fixes
bug 19702; bugfix on 0.2.7.1-alpha. Patch by teor.
- Disable ASAN's detection of segmentation faults while running
test_bt.sh, so that we can make sure that our own backtrace
generation code works. Fixes another aspect of bug 18934; bugfix
on 0.2.5.2-alpha. Patch from "cypherpunks".
- Fix the test-network-all target on out-of-tree builds by using the
correct path to the test driver script. Fixes bug 19421; bugfix
on 0.2.7.3-rc.
o Minor bugfixes (time):
- Improve overflow checks in tv_udiff and tv_mdiff. Fixes bug 19483;
bugfix on all released tor versions.
- When computing the difference between two times in milliseconds,
we now round to the nearest millisecond correctly. Previously, we
could sometimes round in the wrong direction. Fixes bug 19428;
bugfix on 0.2.2.2-alpha.
o Minor bugfixes (user interface):
- Display a more accurate number of suppressed messages in the log
rate-limiter. Previously, there was a potential integer overflow
in the counter. Now, if the number of messages hits a maximum, the
rate-limiter doesn't count any further. Fixes bug 19435; bugfix
on 0.2.4.11-alpha.
- Fix a typo in the passphrase prompt for the ed25519 identity key.
Fixes bug 19503; bugfix on 0.2.7.2-alpha.
o Code simplification and refactoring:
- Remove redundant declarations of the MIN macro. Closes
ticket 18889.
- Rename tor_dup_addr() to tor_addr_to_str_dup() to avoid confusion.
Closes ticket 18462; patch from "icanhasaccount".
- Split the 600-line directory_handle_command_get function into
separate functions for different URL types. Closes ticket 16698.
o Documentation:
- Fix spelling of "--enable-tor2web-mode" in the manpage. Closes
ticket 19153. Patch from "U+039b".
o Removed features:
- Remove support for "GET /tor/bytes.txt" DirPort request, and
"GETINFO dir-usage" controller request, which were only available
via a compile-time option in Tor anyway. Feature was added in
0.2.2.1-alpha. Resolves ticket 19035.
- There is no longer a compile-time option to disable support for
TransPort. (If you don't want TransPort; just don't use it.) Patch
from "U+039b". Closes ticket 19449.
o Testing:
- Run more workqueue tests as part of "make check". These had
previously been implemented, but you needed to know special
command-line options to enable them.
- We now have unit tests for our code to reject zlib "compression
bombs". (Fortunately, the code works fine.)
Changes in version 0.2.8.6 - 2016-08-02
Tor 0.2.8.6 is the first stable version of the Tor 0.2.8 series.
The Tor 0.2.8 series improves client bootstrapping performance,
completes the authority-side implementation of improved identity
keys for relays, and includes numerous bugfixes and performance
improvements throughout the program. This release continues to
improve the coverage of Tor's test suite. For a full list of
changes since Tor 0.2.7, see the ReleaseNotes file.
Changes since 0.2.8.5-rc:
o Minor features (geoip):
- Update geoip and geoip6 to the July 6 2016 Maxmind GeoLite2
Country database.
o Minor bugfixes (compilation):
- Fix a compilation warning in the unit tests on systems where char
is signed. Fixes bug 19682; bugfix on 0.2.8.1-alpha.
o Minor bugfixes (fallback directories):
- Remove 1 fallback that was on the hardcoded list, then opted-out,
leaving 89 of the 100 fallbacks originally introduced in Tor
0.2.8.2-alpha in March 2016. Closes ticket 19782; patch by teor.
o Minor bugfixes (Linux seccomp2 sandbox):
- Allow more syscalls when running with "Sandbox 1" enabled:
sysinfo, getsockopt(SO_SNDBUF), and setsockopt(SO_SNDBUFFORCE). On
some systems, these are required for Tor to start. Fixes bug
18397; bugfix on 0.2.5.1-alpha. Patch from Daniel Pinto.
- Allow IPPROTO_UDP datagram sockets when running with "Sandbox 1",
so that get_interface_address6_via_udp_socket_hack() can work.
Fixes bug 19660; bugfix on 0.2.5.1-alpha.
Changes in version 0.2.8.5-rc - 2016-07-07
Tor 0.2.8.5-rc is the second release candidate in the Tor 0.2.8
series. If we find no new bugs or regressions here, the first stable
0.2.8 release will be identical to it. It has a few small bugfixes
against previous versions.
o Directory authority changes:
- Urras is no longer a directory authority. Closes ticket 19271.
o Major bugfixes (heartbeat):
- Fix a regression that would crash Tor when the periodic
"heartbeat" log messages were disabled. Fixes bug 19454; bugfix on
0.2.8.1-alpha. Reported by "kubaku".
o Minor features (build):
- Tor now again builds with the recent OpenSSL 1.1 development
branch (tested against 1.1.0-pre6-dev). Closes ticket 19499.
- When building manual pages, set the timezone to "UTC", so that the
output is reproducible. Fixes bug 19558; bugfix on 0.2.2.9-alpha.
Patch from intrigeri.
o Minor bugfixes (fallback directory selection):
- Avoid errors during fallback selection if there are no eligible
fallbacks. Fixes bug 19480; bugfix on 0.2.8.3-alpha. Patch
by teor.
o Minor bugfixes (IPv6, microdescriptors):
- Don't check node addresses when we only have a routerstatus. This
allows IPv6-only clients to bootstrap by fetching microdescriptors
from fallback directory mirrors. (The microdescriptor consensus
has no IPv6 addresses in it.) Fixes bug 19608; bugfix
on 0.2.8.2-alpha.
o Minor bugfixes (logging):
- Reduce pointlessly verbose log messages when directory servers
can't be found. Fixes bug 18849; bugfix on 0.2.8.3-alpha and
0.2.8.1-alpha. Patch by teor.
- When a fallback directory changes its fingerprint from the hard-
coded fingerprint, log a less severe, more explanatory log
message. Fixes bug 18812; bugfix on 0.2.8.1-alpha. Patch by teor.
o Minor bugfixes (Linux seccomp2 sandboxing):
- Allow statistics to be written to disk when "Sandbox 1" is
enabled. Fixes bugs 19556 and 19957; bugfix on 0.2.5.1-alpha and
0.2.6.1-alpha respectively.
o Minor bugfixes (user interface):
- Remove a warning message "Service [scrubbed] not found after
descriptor upload". This message appears when one uses HSPOST
control command to upload a service descriptor. Since there is
only a descriptor and no service, showing this message is
pointless and confusing. Fixes bug 19464; bugfix on 0.2.7.2-alpha.
o Fallback directory list:
- Add a comment to the generated fallback directory list that
explains how to comment out unsuitable fallbacks in a way that's
compatible with the stem fallback parser.
- Update fallback whitelist and blacklist based on relay operator
emails. Blacklist unsuitable (non-working, over-volatile)
fallbacks. Resolves ticket 19071. Patch by teor.
- Remove 10 unsuitable fallbacks, leaving 90 of the 100 fallbacks
originally introduced in Tor 0.2.8.2-alpha in March 2016. Closes
ticket 19071; patch by teor.
Changes in version 0.2.8.4-rc - 2016-06-15
Tor 0.2.8.4-rc is the first release candidate in the Tor 0.2.8 series.
If we find no new bugs or regressions here, the first stable 0.2.8
release will be identical to it. It has a few small bugfixes against
previous versions.
o Major bugfixes (user interface):
- Correctly give a warning in the cases where a relay is specified
by nickname, and one such relay is found, but it is not officially
Named. Fixes bug 19203; bugfix on 0.2.3.1-alpha.
o Minor features (build):
- Tor now builds once again with the recent OpenSSL 1.1 development
branch (tested against 1.1.0-pre5 and 1.1.0-pre6-dev).
o Minor features (geoip):
- Update geoip and geoip6 to the June 7 2016 Maxmind GeoLite2
Country database.
o Minor bugfixes (compilation):
- Cause the unit tests to compile correctly on mingw64 versions that
lack sscanf. Fixes bug 19213; bugfix on 0.2.7.1-alpha.
o Minor bugfixes (downloading):
- Predict more correctly whether we'll be downloading over HTTP when
we determine the maximum length of a URL. This should avoid a
"BUG" warning about the Squid HTTP proxy and its URL limits. Fixes
bug 19191.
Changes in version 0.2.8.3-alpha - 2016-05-26
Tor 0.2.8.3-alpha resolves several bugs, most of them introduced over
the course of the 0.2.8 development cycle. It improves the behavior of
directory clients, fixes several crash bugs, fixes a gap in compiler
hardening, and allows the full integration test suite to run on
more platforms.
o Major bugfixes (security, client, DNS proxy):
- Stop a crash that could occur when a client running with DNSPort
received a query with multiple address types, and the first
address type was not supported. Found and fixed by Scott Dial.
Fixes bug 18710; bugfix on 0.2.5.4-alpha.
o Major bugfixes (security, compilation):
- Correctly detect compiler flags on systems where _FORTIFY_SOURCE
is predefined. Previously, our use of -D_FORTIFY_SOURCE would
cause a compiler warning, thereby making other checks fail, and
needlessly disabling compiler-hardening support. Fixes one case of
bug 18841; bugfix on 0.2.3.17-beta. Patch from "trudokal".
o Major bugfixes (security, directory authorities):
- Fix a crash and out-of-bounds write during authority voting, when
the list of relays includes duplicate ed25519 identity keys. Fixes
bug 19032; bugfix on 0.2.8.2-alpha.
o Major bugfixes (client, bootstrapping):
- Check if bootstrap consensus downloads are still needed when the
linked connection attaches. This prevents tor making unnecessary
begindir-style connections, which are the only directory
connections tor clients make since the fix for 18483 was merged.
- Fix some edge cases where consensus download connections may not
have been closed, even though they were not needed. Related to fix
for 18809.
- Make relays retry consensus downloads the correct number of times,
rather than the more aggressive client retry count. Fixes part of
ticket 18809.
- Stop downloading consensuses when we have a consensus, even if we
don't have all the certificates for it yet. Fixes bug 18809;
bugfix on 0.2.8.1-alpha. Patches by arma and teor.
o Major bugfixes (directory mirrors):
- Decide whether to advertise begindir support in the the same way
we decide whether to advertise our DirPort. Allowing these
decisions to become out-of-sync led to surprising behavior like
advertising begindir support when hibernation made us not
advertise a DirPort. Resolves bug 18616; bugfix on 0.2.8.1-alpha.
Patch by teor.
o Major bugfixes (IPv6 bridges, client):
- Actually use IPv6 addresses when selecting directory addresses for
IPv6 bridges. Fixes bug 18921; bugfix on 0.2.8.1-alpha. Patch
by "teor".
o Major bugfixes (key management):
- If OpenSSL fails to generate an RSA key, do not retain a dangling
pointer to the previous (uninitialized) key value. The impact here
should be limited to a difficult-to-trigger crash, if OpenSSL is
running an engine that makes key generation failures possible, or
if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
Baishakhi Ray.
o Major bugfixes (testing):
- Fix a bug that would block 'make test-network-all' on systems where
IPv6 packets were lost. Fixes bug 19008; bugfix on 0.2.7.3-rc.
- Avoid "WSANOTINITIALISED" warnings in the unit tests. Fixes bug 18668;
bugfix on 0.2.8.1-alpha.
o Minor features (clients):
- Make clients, onion services, and bridge relays always use an
encrypted begindir connection for directory requests. Resolves
ticket 18483. Patch by "teor".
o Minor features (fallback directory mirrors):
- Give each fallback the same weight for client selection; restrict
fallbacks to one per operator; report fallback directory detail
changes when rebuilding list; add new fallback directory mirrors
to the whitelist; and many other minor simplifications and fixes.
Closes tasks 17905, 18749, bug 18689, and fixes part of bug 18812 on
0.2.8.1-alpha; patch by "teor".
- Replace the 21 fallbacks generated in January 2016 and included in
Tor 0.2.8.1-alpha, with a list of 100 fallbacks generated in March
2016. Closes task 17158; patch by "teor".
o Minor features (geoip):
- Update geoip and geoip6 to the May 4 2016 Maxmind GeoLite2
Country database.
o Minor bugfixes (assert, portability):
- Fix an assertion failure in memarea.c on systems where "long" is
shorter than the size of a pointer. Fixes bug 18716; bugfix
on 0.2.1.1-alpha.
o Minor bugfixes (bootstrap):
- Consistently use the consensus download schedule for authority
certificates. Fixes bug 18816; bugfix on 0.2.4.13-alpha.
o Minor bugfixes (build):
- Remove a pair of redundant AM_CONDITIONAL declarations from
configure.ac. Fixes one final case of bug 17744; bugfix
on 0.2.8.2-alpha.
- Resolve warnings when building on systems that are concerned with
signed char. Fixes bug 18728; bugfix on 0.2.7.2-alpha
and 0.2.6.1-alpha.
- When libscrypt.h is found, but no libscrypt library can be linked,
treat libscrypt as absent. Fixes bug 19161; bugfix
on 0.2.6.1-alpha.
o Minor bugfixes (client):
- Turn all TestingClientBootstrap* into non-testing torrc options.
This changes simply renames them by removing "Testing" in front of
them and they do not require TestingTorNetwork to be enabled
anymore. Fixes bug 18481; bugfix on 0.2.8.1-alpha.
- Make directory node selection more reliable, mainly for IPv6-only
clients and clients with few reachable addresses. Fixes bug 18929;
bugfix on 0.2.8.1-alpha. Patch by "teor".
o Minor bugfixes (controller, microdescriptors):
- Make GETINFO dir/status-vote/current/consensus conform to the
control specification by returning "551 Could not open cached
consensus..." when not caching consensuses. Fixes bug 18920;
bugfix on 0.2.2.6-alpha.
o Minor bugfixes (crypto, portability):
- The SHA3 and SHAKE routines now produce the correct output on Big
Endian systems. No code calls either algorithm yet, so this is
primarily a build fix. Fixes bug 18943; bugfix on 0.2.8.1-alpha.
- Tor now builds again with the recent OpenSSL 1.1 development
branch (tested against 1.1.0-pre4 and 1.1.0-pre5-dev). Closes
ticket 18286.
o Minor bugfixes (directories):
- When fetching extrainfo documents, compare their SHA256 digests
and Ed25519 signing key certificates with the routerinfo that led
us to fetch them, rather than with the most recent routerinfo.
Otherwise we generate many spurious warnings about mismatches.
Fixes bug 17150; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (logging):
- When we can't generate a signing key because OfflineMasterKey is
set, do not imply that we should have been able to load it. Fixes
bug 18133; bugfix on 0.2.7.2-alpha.
- Stop periodic_event_dispatch() from blasting twelve lines per
second at loglevel debug. Fixes bug 18729; fix on 0.2.8.1-alpha.
- When rejecting a misformed INTRODUCE2 cell, only log at
PROTOCOL_WARN severity. Fixes bug 18761; bugfix on 0.2.8.2-alpha.
o Minor bugfixes (pluggable transports):
- Avoid reporting a spurious error when we decide that we don't need
to terminate a pluggable transport because it has already exited.
Fixes bug 18686; bugfix on 0.2.5.5-alpha.
o Minor bugfixes (pointer arithmetic):
- Fix a bug in memarea_alloc() that could have resulted in remote
heap write access, if Tor had ever passed an unchecked size to
memarea_alloc(). Fortunately, all the sizes we pass to
memarea_alloc() are pre-checked to be less than 128 kilobytes.
Fixes bug 19150; bugfix on 0.2.1.1-alpha. Bug found by
Guido Vranken.
o Minor bugfixes (relays):
- Consider more config options when relays decide whether to
regenerate their descriptor. Fixes more of bug 12538; bugfix
on 0.2.8.1-alpha.
- Resolve some edge cases where we might launch an ORPort
reachability check even when DisableNetwork is set. Noticed while
fixing bug 18616; bugfix on 0.2.3.9-alpha.
o Minor bugfixes (statistics):
- We now include consensus downloads via IPv6 in our directory-
request statistics. Fixes bug 18460; bugfix on 0.2.3.14-alpha.
o Minor bugfixes (testing):
- Allow directories in small networks to bootstrap by skipping
DirPort checks when the consensus has no exits. Fixes bug 19003;
bugfix on 0.2.8.1-alpha. Patch by teor.
- Fix a small memory leak that would occur when the
TestingEnableCellStatsEvent option was turned on. Fixes bug 18673;
bugfix on 0.2.5.2-alpha.
o Minor bugfixes (time handling):
- When correcting a corrupt 'struct tm' value, fill in the tm_wday
field. Otherwise, our unit tests crash on Windows. Fixes bug
18977; bugfix on 0.2.2.25-alpha.
o Documentation:
- Document the contents of the 'datadir/keys' subdirectory in the
manual page. Closes ticket 17621.
- Stop recommending use of nicknames to identify relays in our
MapAddress documentation. Closes ticket 18312.
Changes in version 0.2.8.2-alpha - 2016-03-28
Tor 0.2.8.2-alpha is the second alpha in its series. It fixes numerous
bugs in earlier versions of Tor, including some that prevented
authorities using Tor 0.2.7.x from running correctly. IPv6 and
directory support should also be much improved.
o New system requirements:
- Tor no longer supports versions of OpenSSL with a broken
implementation of counter mode. (This bug was present in OpenSSL
1.0.0, and was fixed in OpenSSL 1.0.0a.) Tor still detects, but no
longer runs with, these versions.
- Tor no longer attempts to support platforms where the "time_t"
type is unsigned. (To the best of our knowledge, only OpenVMS does
this, and Tor has never actually built on OpenVMS.) Closes
ticket 18184.
- Tor now uses Autoconf version 2.63 or later, and Automake 1.11 or
later (released in 2008 and 2009 respectively). If you are
building Tor from the git repository instead of from the source
distribution, and your tools are older than this, you will need to
upgrade. Closes ticket 17732.
o Major bugfixes (security, pointers):
- Avoid a difficult-to-trigger heap corruption attack when extending
a smartlist to contain over 16GB of pointers. Fixes bug 18162;
bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
Reported by Guido Vranken.
o Major bugfixes (bridges, pluggable transports):
- Modify the check for OR connections to private addresses. Allow
bridges on private addresses, including pluggable transports that
ignore the (potentially private) address in the bridge line. Fixes
bug 18517; bugfix on 0.2.8.1-alpha. Reported by gk, patch by teor.
o Major bugfixes (compilation):
- Repair hardened builds under the clang compiler. Previously, our
use of _FORTIFY_SOURCE would conflict with clang's address
sanitizer. Fixes bug 14821; bugfix on 0.2.5.4-alpha.
o Major bugfixes (crash on shutdown):
- Correctly handle detaching circuits from muxes when shutting down.
Fixes bug 18116; bugfix on 0.2.8.1-alpha.
- Fix an assert-on-exit bug related to counting memory usage in
rephist.c. Fixes bug 18651; bugfix on 0.2.8.1-alpha.
o Major bugfixes (crash on startup):
- Fix a segfault during startup: If a Unix domain socket was
configured as listener (such as a ControlSocket or a SocksPort
"unix:" socket), and tor was started as root but not configured to
switch to another user, tor would segfault while trying to string
compare a NULL value. Fixes bug 18261; bugfix on 0.2.8.1-alpha.
Patch by weasel.
o Major bugfixes (dns proxy mode, crash):
- Avoid crashing when running as a DNS proxy. Fixes bug 16248;
bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
o Major bugfixes (relays, bridge clients):
- Ensure relays always allow IPv4 OR and Dir connections. Ensure
bridge clients use the address configured in the bridge line.
Fixes bug 18348; bugfix on 0.2.8.1-alpha. Reported by sysrqb,
patch by teor.
o Major bugfixes (voting):
- Actually enable support for authorities to match routers by their
Ed25519 identities. Previously, the code had been written, but
some debugging code that had accidentally been left in the
codebase made it stay turned off. Fixes bug 17702; bugfix
on 0.2.7.2-alpha.
- When collating votes by Ed25519 identities, authorities now
include a "NoEdConsensus" flag if the ed25519 value (or lack
thereof) for a server does not reflect the majority consensus.
Related to bug 17668; bugfix on 0.2.7.2-alpha.
- When generating a vote with keypinning disabled, never include two
entries for the same ed25519 identity. This bug was causing
authorities to generate votes that they could not parse when a
router violated key pinning by changing its RSA identity but
keeping its Ed25519 identity. Fixes bug 17668; fixes part of bug
18318. Bugfix on 0.2.7.2-alpha.
o Minor features (security, win32):
- Set SO_EXCLUSIVEADDRUSE on Win32 to avoid a local port-stealing
attack. Fixes bug 18123; bugfix on all tor versions. Patch
by teor.
o Minor features (bug-resistance):
- Make Tor survive errors involving connections without a
corresponding event object. Previously we'd fail with an
assertion; now we produce a log message. Related to bug 16248.
o Minor features (build):
- Detect systems with FreeBSD-derived kernels (such as GNU/kFreeBSD)
as having possible IPFW support. Closes ticket 18448. Patch from
Steven Chamberlain.
o Minor features (code hardening):
- Use tor_snprintf() and tor_vsnprintf() even in external and low-
level code, to harden against accidental failures to NUL-
terminate. Part of ticket 17852. Patch from jsturgix. Found
with Flawfinder.
o Minor features (crypto):
- Validate the hard-coded Diffie-Hellman parameters and ensure that
p is a safe prime, and g is a suitable generator. Closes
ticket 18221.
o Minor features (geoip):
- Update geoip and geoip6 to the March 3 2016 Maxmind GeoLite2
Country database.
o Minor features (hidden service directory):
- Streamline relay-side hsdir handling: when relays consider whether
to accept an uploaded hidden service descriptor, they no longer
check whether they are one of the relays in the network that is
"supposed" to handle that descriptor. Implements ticket 18332.
o Minor features (IPv6):
- Add ClientPreferIPv6DirPort, which is set to 0 by default. If set
to 1, tor prefers IPv6 directory addresses.
- Add ClientUseIPv4, which is set to 1 by default. If set to 0, tor
avoids using IPv4 for client OR and directory connections.
- Try harder to obey the IP version restrictions "ClientUseIPv4 0",
"ClientUseIPv6 0", "ClientPreferIPv6ORPort", and
"ClientPreferIPv6DirPort". Closes ticket 17840; patch by teor.
o Minor features (linux seccomp2 sandbox):
- Reject attempts to change our Address with "Sandbox 1" enabled.
Changing Address with Sandbox turned on would never actually work,
but previously it would fail in strange and confusing ways. Found
while fixing 18548.
o Minor features (robustness):
- Exit immediately with an error message if the code attempts to use
Libevent without having initialized it. This should resolve some
frequently-made mistakes in our unit tests. Closes ticket 18241.
o Minor features (unix domain sockets):
- Add a new per-socket option, RelaxDirModeCheck, to allow creating
Unix domain sockets without checking the permissions on the parent
directory. (Tor checks permissions by default because some
operating systems only check permissions on the parent directory.
However, some operating systems do look at permissions on the
socket, and tor's default check is unneeded.) Closes ticket 18458.
Patch by weasel.
o Minor bugfixes (exit policies, security):
- Refresh an exit relay's exit policy when interface addresses
change. Previously, tor only refreshed the exit policy when the
configured external address changed. Fixes bug 18208; bugfix on
0.2.7.3-rc. Patch by teor.
o Minor bugfixes (security, hidden services):
- Prevent hidden services connecting to client-supplied rendezvous
addresses that are reserved as internal or multicast. Fixes bug
8976; bugfix on 0.2.3.21-rc. Patch by dgoulet and teor.
o Minor bugfixes (build):
- Do not link the unit tests against both the testing and non-
testing versions of the static libraries. Fixes bug 18490; bugfix
on 0.2.7.1-alpha.
- Avoid spurious failures from configure files related to calling
exit(0) in TOR_SEARCH_LIBRARY. Fixes bug 18626; bugfix on
0.2.0.1-alpha. Patch from "cypherpunks".
- Silence spurious clang-scan warnings in the ed25519_donna code by
explicitly initializing some objects. Fixes bug 18384; bugfix on
0.2.7.2-alpha. Patch by teor.
o Minor bugfixes (client, bootstrap):
- Count receipt of new microdescriptors as progress towards
bootstrapping. Previously, with EntryNodes set, Tor might not
successfully repopulate the guard set on bootstrapping. Fixes bug
16825; bugfix on 0.2.3.1-alpha.
o Minor bugfixes (code correctness):
- Update to the latest version of Trunnel, which tries harder to
avoid generating code that can invoke memcpy(p,NULL,0). Bug found
by clang address sanitizer. Fixes bug 18373; bugfix
on 0.2.7.2-alpha.
o Minor bugfixes (configuration):
- Fix a tiny memory leak when parsing a port configuration ending in
":auto". Fixes bug 18374; bugfix on 0.2.3.3-alpha.
o Minor bugfixes (containers):
- If we somehow attempt to construct a heap with more than
1073741822 elements, avoid an integer overflow when maintaining
the heap property. Fixes bug 18296; bugfix on 0.1.2.1-alpha.
o Minor bugfixes (correctness):
- Fix a bad memory handling bug that would occur if we had queued a
cell on a channel's incoming queue. Fortunately, we can't actually
queue a cell like that as our code is constructed today, but it's
best to avoid this kind of error, even if there isn't any code
that triggers it today. Fixes bug 18570; bugfix on 0.2.4.4-alpha.
o Minor bugfixes (directory):
- When generating a URL for a directory server on an IPv6 address,
wrap the IPv6 address in square brackets. Fixes bug 18051; bugfix
on 0.2.3.9-alpha. Patch from Malek.
o Minor bugfixes (fallback directory mirrors):
- When requesting extrainfo descriptors from a trusted directory
server, check whether it is an authority or a fallback directory
which supports extrainfo descriptors. Fixes bug 18489; bugfix on
0.2.4.7-alpha. Reported by atagar, patch by teor.
o Minor bugfixes (hidden service, client):
- Handle the case where the user makes several fast consecutive
requests to the same .onion address. Previously, the first six
requests would each trigger a descriptor fetch, each picking a
directory (there are 6 overall) and the seventh one would fail
because no directories were left, thereby triggering a close on
all current directory connections asking for the hidden service.
The solution here is to not close the connections if we have
pending directory fetches. Fixes bug 15937; bugfix
on 0.2.7.1-alpha.
o Minor bugfixes (hidden service, control port):
- Add the onion address to the HS_DESC event for the UPLOADED action
both on success or failure. It was previously hardcoded with
UNKNOWN. Fixes bug 16023; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (hidden service, directory):
- Bridges now refuse "rendezvous2" (hidden service descriptor)
publish attempts. Suggested by ticket 18332.
o Minor bugfixes (linux seccomp2 sandbox):
- Allow the setrlimit syscall, and the prlimit and prlimit64
syscalls, which some libc implementations use under the hood.
Fixes bug 15221; bugfix on 0.2.5.1-alpha.
- Avoid a 10-second delay when starting as a client with "Sandbox 1"
enabled and no DNS resolvers configured. This should help TAILS
start up faster. Fixes bug 18548; bugfix on 0.2.5.1-alpha.
- Fix the sandbox's interoperability with unix domain sockets under
setuid. Fixes bug 18253; bugfix on 0.2.8.1-alpha.
o Minor bugfixes (logging):
- When logging information about an unparsable networkstatus vote or
consensus, do not say "vote" when we mean consensus. Fixes bug
18368; bugfix on 0.2.0.8-alpha.
- Scrub service name in "unrecognized service ID" log messages.
Fixes bug 18600; bugfix on 0.2.4.11-alpha.
- Downgrade logs and backtraces about IP versions to info-level.
Only log backtraces once each time tor runs. Assists in diagnosing
bug 18351; bugfix on 0.2.8.1-alpha. Reported by sysrqb and
Christian, patch by teor.
o Minor bugfixes (memory safety):
- Avoid freeing an uninitialized pointer when opening a socket fails
in get_interface_addresses_ioctl(). Fixes bug 18454; bugfix on
0.2.3.11-alpha. Reported by toralf and "cypherpunks", patch
by teor.
- Correctly duplicate addresses in get_interface_address6_list().
Fixes bug 18454; bugfix on 0.2.8.1-alpha. Reported by toralf,
patch by "cypherpunks".
- Fix a memory leak in tor-gencert. Fixes part of bug 18672; bugfix
on 0.2.0.1-alpha.
- Fix a memory leak in "tor --list-fingerprint". Fixes part of bug
18672; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (private directory):
- Prevent a race condition when creating private directories. Fixes
part of bug 17852; bugfix on 0.0.2pre13. Part of ticket 17852.
Patch from jsturgix. Found with Flawfinder.
o Minor bugfixes (test networks, IPv6):
- Allow internal IPv6 addresses in descriptors in test networks.
Fixes bug 17153; bugfix on 0.2.3.16-alpha. Patch by teor, reported
by karsten.
o Minor bugfixes (testing):
- We no longer disable assertions in the unit tests when coverage is
enabled. Instead, we require you to say --disable-asserts-in-tests
to the configure script if you need assertions disabled in the
unit tests (for example, if you want to perform branch coverage).
Fixes bug 18242; bugfix on 0.2.7.1-alpha.
o Minor bugfixes (time parsing):
- Avoid overflow in tor_timegm when parsing dates in and after 2038
on platforms with 32-bit time_t. Fixes bug 18479; bugfix on
0.0.2pre14. Patch by teor.
o Minor bugfixes (tor-gencert):
- Correctly handle the case where an authority operator enters a
passphrase but sends an EOF before sending a newline. Fixes bug
17443; bugfix on 0.2.0.20-rc. Found by junglefowl.
o Code simplification and refactoring:
- Quote all the string interpolations in configure.ac -- even those
which we are pretty sure can't contain spaces. Closes ticket
17744. Patch from zerosion.
- Remove specialized code for non-inplace AES_CTR. 99% of our AES is
inplace, so there's no need to have a separate implementation for
the non-inplace code. Closes ticket 18258. Patch from Malek.
- Simplify return types for some crypto functions that can't
actually fail. Patch from Hassan Alsibyani. Closes ticket 18259.
o Documentation:
- Change build messages to refer to "Fedora" instead of "Fedora
Core", and "dnf" instead of "yum". Closes tickets 18459 and 18426.
Patches from "icanhasaccount" and "cypherpunks".
o Removed features:
- We no longer maintain an internal freelist in memarea.c.
Allocators should be good enough to make this code unnecessary,
and it's doubtful that it ever had any performance benefit.
o Testing:
- Fix several warnings from clang's address sanitizer produced in
the unit tests.
- Treat backtrace test failures as expected on FreeBSD until we
solve bug 17808. Closes ticket 18204.
Changes in version 0.2.8.1-alpha - 2016-02-04
Tor 0.2.8.1-alpha is the first alpha release in its series. It
includes numerous small features and bugfixes against previous Tor
versions, and numerous small infrastructure improvements. The most
notable features are a set of improvements to the directory subsystem.
o Major features (security, Linux):
- When Tor starts as root on Linux and is told to switch user ID, it
can now retain the capability to bind to low ports. By default,
Tor will do this only when it's switching user ID and some low
ports have been configured. You can change this behavior with the
new option KeepBindCapabilities. Closes ticket 8195.
o Major features (directory system):
- When bootstrapping multiple consensus downloads at a time, use the
first one that starts downloading, and close the rest. This
reduces failures when authorities or fallback directories are slow
or down. Together with the code for feature 15775, this feature
should reduces failures due to fallback churn. Implements ticket
4483. Patch by "teor". Implements IPv4 portions of proposal 210 by
"mikeperry" and "teor".
- Include a trial list of 21 default fallback directories, generated
in January 2016, based on an opt-in survey of suitable relays.
Doing this should make clients bootstrap more quickly and reliably,
and reduce the load on the directory authorities. Closes ticket
15775. Patch by "teor".
Candidates identified using an OnionOO script by "weasel", "teor",
"gsathya", and "karsten".
- Previously only relays that explicitly opened a directory port
(DirPort) accepted directory requests from clients. Now all
relays, with and without a DirPort, accept and serve tunneled
directory requests that they receive through their ORPort. You can
disable this behavior using the new DirCache option. Closes
ticket 12538.
o Major key updates:
- Update the V3 identity key for the dannenberg directory authority:
it was changed on 18 November 2015. Closes task 17906. Patch
by "teor".
o Minor features (security, clock):
- Warn when the system clock appears to move back in time (when the
state file was last written in the future). Tor doesn't know that
consensuses have expired if the clock is in the past. Patch by
"teor". Implements ticket 17188.
o Minor features (security, exit policies):
- ExitPolicyRejectPrivate now rejects more private addresses by
default. Specifically, it now rejects the relay's outbound bind
addresses (if configured), and the relay's configured port
addresses (such as ORPort and DirPort). Fixes bug 17027; bugfix on
0.2.0.11-alpha. Patch by "teor".
o Minor features (security, memory erasure):
- Set the unused entries in a smartlist to NULL. This helped catch
a (harmless) bug, and shouldn't affect performance too much.
Implements ticket 17026.
- Use SecureMemoryWipe() function to securely clean memory on
Windows. Previously we'd use OpenSSL's OPENSSL_cleanse() function.
Implements feature 17986.
- Use explicit_bzero or memset_s when present. Previously, we'd use
OpenSSL's OPENSSL_cleanse() function. Closes ticket 7419; patches
from <logan@hackers.mu> and <selven@hackers.mu>.
- Make memwipe() do nothing when passed a NULL pointer or buffer of
zero size. Check size argument to memwipe() for underflow. Fixes
bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
patch by "teor".
o Minor features (security, RNG):
- Adjust Tor's use of OpenSSL's RNG APIs so that they absolutely,
positively are not allowed to fail. Previously we depended on
internal details of OpenSSL's behavior. Closes ticket 17686.
- Never use the system entropy output directly for anything besides
seeding the PRNG. When we want to generate important keys, instead
of using system entropy directly, we now hash it with the PRNG
stream. This may help resist certain attacks based on broken OS
entropy implementations. Closes part of ticket 17694.
- Use modern system calls (like getentropy() or getrandom()) to
generate strong entropy on platforms that have them. Closes
ticket 13696.
o Minor features (accounting):
- Added two modes to the AccountingRule option: One for limiting
only the number of bytes sent ("AccountingRule out"), and one for
limiting only the number of bytes received ("AccountingRule in").
Closes ticket 15989; patch from "unixninja92".
o Minor features (build):
- Since our build process now uses "make distcheck", we no longer
force "make dist" to depend on "make check". Closes ticket 17893;
patch from "cypherpunks."
- Tor now builds successfully with the recent OpenSSL 1.1
development branch, and with the latest LibreSSL. Closes tickets
17549, 17921, and 17984.
o Minor features (controller):
- Adds the FallbackDir entries to 'GETINFO config/defaults'. Closes
tickets 16774 and 17817. Patch by George Tankersley.
- New 'GETINFO hs/service/desc/id/' command to retrieve a hidden
service descriptor from a service's local hidden service
descriptor cache. Closes ticket 14846.
- Add 'GETINFO exit-policy/reject-private/[default,relay]', so
controllers can examine the the reject rules added by
ExitPolicyRejectPrivate. This makes it easier for stem to display
exit policies.
o Minor features (crypto):
- Add SHA512 support to crypto.c. Closes ticket 17663; patch from
George Tankersley.
- Add SHA3 and SHAKE support to crypto.c. Closes ticket 17783.
- When allocating a digest state object, allocate no more space than
we actually need. Previously, we would allocate as much space as
the state for the largest algorithm would need. This change saves
up to 672 bytes per circuit. Closes ticket 17796.
- Improve performance when hashing non-multiple of 8 sized buffers,
based on Andrew Moon's public domain SipHash-2-4 implementation.
Fixes bug 17544; bugfix on 0.2.5.3-alpha.
o Minor features (directory downloads):
- Wait for busy authorities and fallback directories to become non-
busy when bootstrapping. (A similar change was made in 6c443e987d
for directory caches chosen from the consensus.) Closes ticket
17864; patch by "teor".
- Add UseDefaultFallbackDirs, which enables any hard-coded fallback
directory mirrors. The default is 1; set it to 0 to disable
fallbacks. Implements ticket 17576. Patch by "teor".
o Minor features (geoip):
- Update geoip and geoip6 to the January 5 2016 Maxmind GeoLite2
Country database.
o Minor features (IPv6):
- Add an argument 'ipv6=address:orport' to the DirAuthority and
FallbackDir torrc options, to specify an IPv6 address for an
authority or fallback directory. Add hard-coded ipv6 addresses for
directory authorities that have them. Closes ticket 17327; patch
from Nick Mathewson and "teor".
- Add address policy assume_action support for IPv6 addresses.
- Limit IPv6 mask bits to 128.
- Warn when comparing against an AF_UNSPEC address in a policy, it's
almost always a bug. Closes ticket 17863; patch by "teor".
- Allow users to configure directory authorities and fallback
directory servers with IPv6 addresses and ORPorts. Resolves
ticket 6027.
- routerset_parse now accepts IPv6 literal addresses. Fixes bug
17060; bugfix on 0.2.1.3-alpha. Patch by "teor".
- Make tor_ersatz_socketpair work on IPv6-only systems. Fixes bug
17638; bugfix on 0.0.2pre8. Patch by "teor".
o Minor features (logging):
- When logging to syslog, allow a tag to be added to the syslog
identity (the string prepended to every log message). The tag can
be configured with SyslogIdentityTag and defaults to none. Setting
it to "foo" will cause logs to be tagged as "Tor-foo". Closes
ticket 17194.
o Minor features (portability):
- Use timingsafe_memcmp() where available. Closes ticket 17944;
patch from <logan@hackers.mu>.
o Minor features (relay, address discovery):
- Add a family argument to get_interface_addresses_raw() and
subfunctions to make network interface address interogation more
efficient. Now Tor can specifically ask for IPv4, IPv6 or both
types of interfaces from the operating system. Resolves
ticket 17950.
- When get_interface_address6_list(.,AF_UNSPEC,.) is called and
fails to enumerate interface addresses using the platform-specific
API, have it rely on the UDP socket fallback technique to try and
find out what IP addresses (both IPv4 and IPv6) our machine has.
Resolves ticket 17951.
o Minor features (replay cache):
- The replay cache now uses SHA256 instead of SHA1. Implements
feature 8961. Patch by "teor", issue reported by "rransom".
o Minor features (unix file permissions):
- Defer creation of Unix sockets until after setuid. This avoids
needing CAP_CHOWN and CAP_FOWNER when using systemd's
CapabilityBoundingSet, or chown and fowner when using SELinux.
Implements part of ticket 17562. Patch from Jamie Nguyen.
- If any directory created by Tor is marked as group readable, the
filesystem group is allowed to be either the default GID or the
root user. Allowing root to read the DataDirectory prevents the
need for CAP_READ_SEARCH when using systemd's
CapabilityBoundingSet, or dac_read_search when using SELinux.
Implements part of ticket 17562. Patch from Jamie Nguyen.
- Introduce a new DataDirectoryGroupReadable option. If it is set to
1, the DataDirectory will be made readable by the default GID.
Implements part of ticket 17562. Patch from Jamie Nguyen.
o Minor bugfixes (accounting):
- The max bandwidth when using 'AccountRule sum' is now correctly
logged. Fixes bug 18024; bugfix on 0.2.6.1-alpha. Patch
from "unixninja92".
o Minor bugfixes (code correctness):
- When closing an entry connection, generate a warning if we should
have sent an end cell for it but we haven't. Fixes bug 17876;
bugfix on 0.2.3.2-alpha.
- Assert that allocated memory held by the reputation code is freed
according to its internal counters. Fixes bug 17753; bugfix
on 0.1.1.1-alpha.
- Assert when the TLS contexts fail to initialize. Fixes bug 17683;
bugfix on 0.0.6.
o Minor bugfixes (compilation):
- Mark all object files that include micro-revision.i as depending
on it, so as to make parallel builds more reliable. Fixes bug
17826; bugfix on 0.2.5.1-alpha.
- Don't try to use the pthread_condattr_setclock() function unless
it actually exists. Fixes compilation on NetBSD-6.x. Fixes bug
17819; bugfix on 0.2.6.3-alpha.
- Fix backtrace compilation on FreeBSD. Fixes bug 17827; bugfix
on 0.2.5.2-alpha.
- Fix compilation of sandbox.c with musl-libc. Fixes bug 17347;
bugfix on 0.2.5.1-alpha. Patch from 'jamestk'.
- Fix search for libevent libraries on OpenBSD (and other systems
that install libevent 1 and libevent 2 in parallel). Fixes bug
16651; bugfix on 0.1.0.7-rc. Patch from "rubiate".
- Isolate environment variables meant for tests from the rest of the
build system. Fixes bug 17818; bugfix on 0.2.7.3-rc.
- Replace usage of 'INLINE' with 'inline'. Fixes bug 17804; bugfix
on 0.0.2pre8.
- Remove config.log only from make distclean, not from make clean.
Fixes bug 17924; bugfix on 0.2.4.1-alpha.
o Minor bugfixes (crypto):
- Check the return value of HMAC() and assert on failure. Fixes bug
17658; bugfix on 0.2.3.6-alpha. Patch by "teor".
o Minor bugfixes (fallback directories):
- Mark fallbacks as "too busy" when they return a 503 response,
rather than just marking authorities. Fixes bug 17572; bugfix on
0.2.4.7-alpha. Patch by "teor".
o Minor bugfixes (IPv6):
- Update the limits in max_dl_per_request for IPv6 address length.
Fixes bug 17573; bugfix on 0.2.1.5-alpha.
o Minor bugfixes (linux seccomp2 sandbox):
- Fix a crash when using offline master ed25519 keys with the Linux
seccomp2 sandbox enabled. Fixes bug 17675; bugfix on 0.2.7.3-rc.
o Minor bugfixes (logging):
- In log messages that include a function name, use __FUNCTION__
instead of __PRETTY_FUNCTION__. In GCC, these are synonymous, but
with clang __PRETTY_FUNCTION__ has extra information we don't
need. Fixes bug 16563; bugfix on 0.0.2pre8. Fix by Tom van
der Woerdt.
- Remove needless quotes from a log message about unparseable
addresses. Fixes bug 17843; bugfix on 0.2.3.3-alpha.
o Minor bugfixes (portability):
- Remove an #endif from configure.ac so that we correctly detect the
presence of in6_addr.s6_addr32. Fixes bug 17923; bugfix
on 0.2.0.13-alpha.
o Minor bugfixes (relays):
- Check that both the ORPort and DirPort (if present) are reachable
before publishing a relay descriptor. Otherwise, relays publish a
descriptor with DirPort 0 when the DirPort reachability test takes
longer than the ORPort reachability test. Fixes bug 18050; bugfix
on 0.1.0.1-rc. Reported by "starlight", patch by "teor".
o Minor bugfixes (relays, hidden services):
- Refuse connection requests to private OR addresses unless
ExtendAllowPrivateAddresses is set. Previously, tor would connect,
then refuse to send any cells to a private address. Fixes bugs
17674 and 8976; bugfix on 0.2.3.21-rc. Patch by "teor".
o Minor bugfixes (safe logging):
- When logging a malformed hostname received through socks4, scrub
it if SafeLogging says we should. Fixes bug 17419; bugfix
on 0.1.1.16-rc.
o Minor bugfixes (statistics code):
- Consistently check for overflow in round_*_to_next_multiple_of
functions, and add unit tests with additional and maximal values.
Fixes part of bug 13192; bugfix on 0.2.2.1-alpha.
- Handle edge cases in the laplace functions: avoid division by
zero, avoid taking the log of zero, and silence clang type
conversion warnings using round and trunc. Add unit tests for edge
cases with maximal values. Fixes part of bug 13192; bugfix
on 0.2.6.2-alpha.
o Minor bugfixes (testing):
- The test for log_heartbeat was incorrectly failing in timezones
with non-integer offsets. Instead of comparing the end of the time
string against a constant, compare it to the output of
format_local_iso_time when given the correct input. Fixes bug
18039; bugfix on 0.2.5.4-alpha.
- Make unit tests pass on IPv6-only systems, and systems without
localhost addresses (like some FreeBSD jails). Fixes bug 17632;
bugfix on 0.2.7.3-rc. Patch by "teor".
- Fix a memory leak in the ntor test. Fixes bug 17778; bugfix
on 0.2.4.8-alpha.
- Check the full results of SHA256 and SHA512 digests in the unit
tests. Bugfix on 0.2.2.4-alpha. Patch by "teor".
o Code simplification and refactoring:
- Move logging of redundant policy entries in
policies_parse_exit_policy_internal into its own function. Closes
ticket 17608; patch from "juce".
- Extract the more complicated parts of circuit_mark_for_close()
into a new function that we run periodically before circuits are
freed. This change removes more than half of the functions
currently in the "blob". Closes ticket 17218.
- Clean up a little duplicated code in
crypto_expand_key_material_TAP(). Closes ticket 17587; patch
from "pfrankw".
- Decouple the list of streams waiting to be attached to circuits
from the overall connection list. This change makes it possible to
attach streams quickly while simplifying Tor's callgraph and
avoiding O(N) scans of the entire connection list. Closes
ticket 17590.
- When a direct directory request fails immediately on launch,
instead of relaunching that request from inside the code that
launches it, instead mark the connection for teardown. This change
simplifies Tor's callback and prevents the directory-request
launching code from invoking itself recursively. Closes
ticket 17589
- Remove code for configuring OpenSSL dynamic locks; OpenSSL doesn't
use them. Closes ticket 17926.
o Documentation:
- Add a description of the correct use of the '--keygen' command-
line option. Closes ticket 17583; based on text by 's7r'.
- Document the minimum HeartbeatPeriod value. Closes ticket 15638.
- Explain actual minima for BandwidthRate. Closes ticket 16382.
- Fix a minor formatting typo in the manpage. Closes ticket 17791.
- Mention torspec URL in the manpage and point the reader to it
whenever we mention a document that belongs in torspce. Fixes
issue 17392.
o Removed features:
- Remove client-side support for connecting to Tor relays running
versions of Tor before 0.2.3.6-alpha. These relays didn't support
the v3 TLS handshake protocol, and are no longer allowed on the
Tor network. Implements the client side of ticket 11150. Based on
patches by Tom van der Woerdt.
o Testing:
- Add unit tests to check for common RNG failure modes, such as
returning all zeroes, identical values, or incrementing values
(OpenSSL's rand_predictable feature). Patch by "teor".
- Log more information when the backtrace tests fail. Closes ticket
17892. Patch from "cypherpunks."
- Always test both ed25519 backends, so that we can be sure that our
batch-open replacement code works. Part of ticket 16794.
- Cover dns_resolve_impl() in dns.c with unit tests. Implements a
portion of ticket 16831.
- More unit tests for compat_libevent.c, procmon.c, tortls.c,
util_format.c, directory.c, and options_validate.c. Closes tickets
17075, 17082, 17084, 17003, and 17076 respectively. Patches from
Ola Bini.
- Unit tests for directory_handle_command_get. Closes ticket 17004.
Patch from Reinaldo de Souza Jr.
Changes in version 0.2.7.6 - 2015-12-10
Tor version 0.2.7.6 fixes a major bug in entry guard selection, as
well as a minor bug in hidden service reliability.
o Major bugfixes (guard selection):
- Actually look at the Guard flag when selecting a new directory
guard. When we implemented the directory guard design, we
accidentally started treating all relays as if they have the Guard
flag during guard selection, leading to weaker anonymity and worse
performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
by Mohsen Imani.
o Minor features (geoip):
- Update geoip and geoip6 to the December 1 2015 Maxmind GeoLite2
Country database.
o Minor bugfixes (compilation):
- When checking for net/pfvar.h, include netinet/in.h if possible.
This fixes transparent proxy detection on OpenBSD. Fixes bug
17551; bugfix on 0.1.2.1-alpha. Patch from "rubiate".
- Fix a compilation warning with Clang 3.6: Do not check the
presence of an address which can never be NULL. Fixes bug 17781.
o Minor bugfixes (correctness):
- When displaying an IPv6 exit policy, include the mask bits
correctly even when the number is greater than 31. Fixes bug
16056; bugfix on 0.2.4.7-alpha. Patch from "gturner".
- The wrong list was used when looking up expired intro points in a
rend service object, causing what we think could be reachability
issues for hidden services, and triggering a BUG log. Fixes bug
16702; bugfix on 0.2.7.2-alpha.
- Fix undefined behavior in the tor_cert_checksig function. Fixes
bug 17722; bugfix on 0.2.7.2-alpha.
Changes in version 0.2.7.5 - 2015-11-20
The Tor 0.2.7 release series is dedicated to the memory of Tor user
and privacy advocate Caspar Bowden (1961-2015). Caspar worked
tirelessly to advocate human rights regardless of national borders,
and oppose the encroachments of mass surveillance. He opposed national
exceptionalism, he brought clarity to legal and policy debates, he
understood and predicted the impact of mass surveillance on the world,
and he laid the groundwork for resisting it. While serving on the Tor
Project's board of directors, he brought us his uncompromising focus
on technical excellence in the service of humankind. Caspar was an
inimitable force for good and a wonderful friend. He was kind,
humorous, generous, gallant, and believed we should protect one
another without exception. We honor him here for his ideals, his
efforts, and his accomplishments. Please honor his memory with works
that would make him proud.
Tor 0.2.7.5 is the first stable release in the Tor 0.2.7 series.
The 0.2.7 series adds a more secure identity key type for relays,
improves cryptography performance, resolves several longstanding
hidden-service performance issues, improves controller support for
hidden services, and includes small bugfixes and performance
improvements throughout the program. This release series also includes
more tests than before, and significant simplifications to which parts
of Tor invoke which others.
(This release contains no code changes since 0.2.7.4-rc.)
Changes in version 0.2.7.4-rc - 2015-10-21
Tor 0.2.7.4-rc is the second release candidate in the 0.2.7 series. It
fixes some important memory leaks, and a scary-looking (but mostly
harmless in practice) invalid-read bug. It also has a few small
bugfixes, notably fixes for compilation and portability on different
platforms. If no further significant bounds are found, the next
release will the the official stable release.
o Major bugfixes (security, correctness):
- Fix an error that could cause us to read 4 bytes before the
beginning of an openssl string. This bug could be used to cause
Tor to crash on systems with unusual malloc implementations, or
systems with unusual hardening installed. Fixes bug 17404; bugfix
on 0.2.3.6-alpha.
o Major bugfixes (correctness):
- Fix a use-after-free bug in validate_intro_point_failure(). Fixes
bug 17401; bugfix on 0.2.7.3-rc.
o Major bugfixes (memory leaks):
- Fix a memory leak in ed25519 batch signature checking. Fixes bug
17398; bugfix on 0.2.6.1-alpha.
- Fix a memory leak in rend_cache_failure_entry_free(). Fixes bug
17402; bugfix on 0.2.7.3-rc.
- Fix a memory leak when reading an expired signing key from disk.
Fixes bug 17403; bugfix on 0.2.7.2-rc.
o Minor features (geoIP):
- Update geoip and geoip6 to the October 9 2015 Maxmind GeoLite2
Country database.
o Minor bugfixes (compilation):
- Repair compilation with the most recent (unreleased, alpha)
vesions of OpenSSL 1.1. Fixes part of ticket 17237.
- Fix an integer overflow warning in test_crypto_slow.c. Fixes bug
17251; bugfix on 0.2.7.2-alpha.
- Fix compilation of sandbox.c with musl-libc. Fixes bug 17347;
bugfix on 0.2.5.1-alpha. Patch from 'jamestk'.
o Minor bugfixes (portability):
- Use libexecinfo on FreeBSD to enable backtrace support. Fixes
part of bug 17151; bugfix on 0.2.5.2-alpha. Patch from
Marcin Cieślak.
o Minor bugfixes (sandbox):
- Add the "hidserv-stats" filename to our sandbox filter for the
HiddenServiceStatistics option to work properly. Fixes bug 17354;
bugfix on 0.2.6.2-alpha. Patch from David Goulet.
o Minor bugfixes (testing):
- Add unit tests for get_interface_address* failure cases. Fixes bug
17173; bugfix on 0.2.7.3-rc. Patch by fk/teor.
- Fix breakage when running 'make check' with BSD make. Fixes bug
17154; bugfix on 0.2.7.3-rc. Patch by Marcin Cieślak.
- Make the get_ifaddrs_* unit tests more tolerant of different
network configurations. (Don't assume every test box has an IPv4
address, and don't assume every test box has a non-localhost
address.) Fixes bug 17255; bugfix on 0.2.7.3-rc. Patch by "teor".
- Skip backtrace tests when backtrace support is not compiled in.
Fixes part of bug 17151; bugfix on 0.2.7.1-alpha. Patch from
Marcin Cieślak.
o Documentation:
- Fix capitalization of SOCKS in sample torrc. Closes ticket 15609.
- Note that HiddenServicePorts can take a unix domain socket. Closes
ticket 17364.
Changes in version 0.2.7.3-rc - 2015-09-25
Tor 0.2.7.3-rc is the first release candidate in the 0.2.7 series. It
contains numerous usability fixes for Ed25519 keys, safeguards against
several misconfiguration problems, significant simplifications to
Tor's callgraph, and numerous bugfixes and small features.
This is the most tested release of Tor to date. The unit tests cover
39.40% of the code, and the integration tests (accessible with "make
test-full-online", requiring stem and chutney and a network
connection) raise the coverage to 64.49%.
o Major features (security, hidden services):
- Hidden services, if using the EntryNodes option, are required to
use more than one EntryNode, in order to avoid a guard discovery
attack. (This would only affect people who had configured hidden
services and manually specified the EntryNodes option with a
single entry-node. The impact was that it would be easy to
remotely identify the guard node used by such a hidden service.
See ticket for more information.) Fixes ticket 14917.
o Major features (Ed25519 keys, keypinning):
- The key-pinning option on directory authorities is now advisory-
only by default. In a future version, or when the AuthDirPinKeys
option is set, pins are enforced again. Disabling key-pinning
seemed like a good idea so that we can survive the fallout of any
usability problems associated with Ed25519 keys. Closes
ticket 17135.
o Major features (Ed25519 performance):
- Improve the speed of Ed25519 operations and Curve25519 keypair
generation when built targeting 32 bit x86 platforms with SSE2
available. Implements ticket 16535.
- Improve the runtime speed of Ed25519 signature verification by
using Ed25519-donna's batch verification support. Implements
ticket 16533.
o Major features (performance testing):
- The test-network.sh script now supports performance testing.
Requires corresponding chutney performance testing changes. Patch
by "teor". Closes ticket 14175.
o Major features (relay, Ed25519):
- Significant usability improvements for Ed25519 key management. Log
messages are better, and the code can recover from far more
failure conditions. Thanks to "s7r" for reporting and diagnosing
so many of these!
- Add a new OfflineMasterKey option to tell Tor never to try loading
or generating a secret Ed25519 identity key. You can use this in
combination with tor --keygen to manage offline and/or encrypted
Ed25519 keys. Implements ticket 16944.
- Add a --newpass option to allow changing or removing the
passphrase of an encrypted key with tor --keygen. Implements part
of ticket 16769.
- On receiving a HUP signal, check to see whether the Ed25519
signing key has changed, and reload it if so. Closes ticket 16790.
o Major bugfixes (relay, Ed25519):
- Avoid crashing on 'tor --keygen'. Fixes bug 16679; bugfix on
0.2.7.2-alpha. Reported by "s7r".
- Improve handling of expired signing keys with offline master keys.
Fixes bug 16685; bugfix on 0.2.7.2-alpha. Reported by "s7r".
o Minor features (client-side privacy):
- New KeepAliveIsolateSOCKSAuth option to indefinitely extend circuit
lifespan when IsolateSOCKSAuth and streams with SOCKS
authentication are attached to the circuit. This allows
applications like TorBrowser to manage circuit lifetime on their
own. Implements feature 15482.
- When logging malformed hostnames from SOCKS5 requests, respect
SafeLogging configuration. Fixes bug 16891; bugfix on 0.1.1.16-rc.
o Minor features (compilation):
- Give a warning as early as possible when trying to build with an
unsupported OpenSSL version. Closes ticket 16901.
- Fail during configure if we're trying to build against an OpenSSL
built without ECC support. Fixes bug 17109, bugfix on 0.2.7.1-alpha
which started requiring ECC.
o Minor features (geoip):
- Update geoip and geoip6 to the September 3 2015 Maxmind GeoLite2
Country database.
o Minor features (hidden services):
- Relays need to have the Fast flag to get the HSDir flag. As this
is being written, we'll go from 2745 HSDirs down to 2342, a ~14%
drop. This change should make some attacks against the hidden
service directory system harder. Fixes ticket 15963.
- Turn on hidden service statistics collection by setting the torrc
option HiddenServiceStatistics to "1" by default. (This keeps
track only of the fraction of traffic used by hidden services, and
the total number of hidden services in existence.) Closes
ticket 15254.
- Client now uses an introduction point failure cache to know when
to fetch or keep a descriptor in their cache. Previously, failures
were recorded implicitly, but not explicitly remembered. Closes
ticket 16389.
o Minor features (testing, authorities, documentation):
- New TestingDirAuthVote{Exit,Guard,HSDir}IsStrict flags to
explicitly manage consensus flags in testing networks. Patch by
"robgjansen", modified by "teor". Implements part of ticket 14882.
o Minor bugfixes (security, exit policies):
- ExitPolicyRejectPrivate now also rejects the relay's published
IPv6 address (if any), and any publicly routable IPv4 or IPv6
addresses on any local interfaces. ticket 17027. Patch by "teor".
Fixes bug 17027; bugfix on 0.2.0.11-alpha.
o Minor bug fixes (torrc exit policies):
- In torrc, "accept6 *" and "reject6 *" ExitPolicy lines now only
produce IPv6 wildcard addresses. Previously they would produce
both IPv4 and IPv6 wildcard addresses. Patch by "teor". Fixes part
of bug 16069; bugfix on 0.2.4.7-alpha.
- When parsing torrc ExitPolicies, we now warn for a number of cases
where the user's intent is likely to differ from Tor's actual
behavior. These include: using an IPv4 address with an accept6 or
reject6 line; using "private" on an accept6 or reject6 line; and
including any ExitPolicy lines after accept *:* or reject *:*.
Related to ticket 16069.
- When parsing torrc ExitPolicies, we now issue an info-level
message when expanding an "accept/reject *" line to include both
IPv4 and IPv6 wildcard addresses. Related to ticket 16069.
- In each instance above, usage advice is provided to avoid the
message. Resolves ticket 16069. Patch by "teor". Fixes part of bug
16069; bugfix on 0.2.4.7-alpha.
o Minor bugfixes (authority):
- Don't assign "HSDir" to a router if it isn't Valid and Running.
Fixes bug 16524; bugfix on 0.2.7.2-alpha.
- Downgrade log messages about Ed25519 key issues if they are in old
cached router descriptors. Fixes part of bug 16286; bugfix
on 0.2.7.2-alpha.
- When we find an Ed25519 key issue in a cached descriptor, stop
saying the descriptor was just "uploaded". Fixes another part of
bug 16286; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (control port):
- Repair a warning and a spurious result when getting the maximum
number of file descriptors from the controller. Fixes bug 16697;
bugfix on 0.2.7.2-alpha.
o Minor bugfixes (correctness):
- When calling channel_free_list(), avoid calling smartlist_remove()
while inside a FOREACH loop. This partially reverts commit
17356fe7fd96af where the correct SMARTLIST_DEL_CURRENT was
incorrectly removed. Fixes bug 16924; bugfix on 0.2.4.4-alpha.
o Minor bugfixes (documentation):
- Advise users on how to configure separate IPv4 and IPv6 exit
policies in the manpage and sample torrcs. Related to ticket 16069.
- Fix the usage message of tor-resolve(1) so that it no longer lists
the removed -F option. Fixes bug 16913; bugfix on 0.2.2.28-beta.
- Fix an error in the manual page and comments for
TestingDirAuthVoteHSDir[IsStrict], which suggested that a HSDir
required "ORPort connectivity". While this is true, it is in no
way unique to the HSDir flag. Of all the flags, only HSDirs need a
DirPort configured in order for the authorities to assign that
particular flag. Patch by "teor". Fixed as part of 14882; bugfix
on 0.2.6.3-alpha.
o Minor bugfixes (Ed25519):
- Fix a memory leak when reading router descriptors with expired
Ed25519 certificates. Fixes bug 16539; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (linux seccomp2 sandbox):
- Allow bridge authorities to run correctly under the seccomp2
sandbox. Fixes bug 16964; bugfix on 0.2.5.1-alpha.
- Allow routers with ed25519 keys to run correctly under the
seccomp2 sandbox. Fixes bug 16965; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (open file limit):
- Fix set_max_file_descriptors() to set by default the max open file
limit to the current limit when setrlimit() fails. Fixes bug
16274; bugfix on 0.2.0.10-alpha. Patch by dgoulet.
o Minor bugfixes (portability):
- Try harder to normalize the exit status of the Tor process to the
standard-provided range. Fixes bug 16975; bugfix on every version
of Tor ever.
- Check correctly for Windows socket errors in the workqueue
backend. Fixes bug 16741; bugfix on 0.2.6.3-alpha.
- Fix the behavior of crypto_rand_time_range() when told to consider
times before 1970. (These times were possible when running in a
simulated network environment where time()'s output starts at
zero.) Fixes bug 16980; bugfix on 0.2.7.1-alpha.
- Restore correct operation of TLS client-cipher detection on
OpenSSL 1.1. Fixes bug 14047; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (relay):
- Ensure that worker threads actually exit when a fatal error or
shutdown is indicated. This fix doesn't currently affect the
behavior of Tor, because Tor workers never indicates fatal error
or shutdown except in the unit tests. Fixes bug 16868; bugfix
on 0.2.6.3-alpha.
- Unblock threads before releasing the work queue mutex to ensure
predictable scheduling behavior. Fixes bug 16644; bugfix
on 0.2.6.3-alpha.
o Code simplification and refactoring:
- Change the function that's called when we need to retry all
downloads so that it only reschedules the downloads to happen
immediately, rather than launching them all at once itself. This
further simplifies Tor's callgraph.
- Move some format-parsing functions out of crypto.c and
crypto_curve25519.c into crypto_format.c and/or util_format.c.
- Move the client-only parts of init_keys() into a separate
function. Closes ticket 16763.
- Simplify the microdesc_free() implementation so that it no longer
appears (to code analysis tools) to potentially invoke a huge
suite of other microdesc functions.
- Simply the control graph further by deferring the inner body of
directory_all_unreachable() into a callback. Closes ticket 16762.
- Treat the loss of an owning controller as equivalent to a SIGTERM
signal. This removes a tiny amount of duplicated code, and
simplifies our callgraph. Closes ticket 16788.
- When generating an event to send to the controller, we no longer
put the event over the network immediately. Instead, we queue
these events, and use a Libevent callback to deliver them. This
change simplifies Tor's callgraph by reducing the number of
functions from which all other Tor functions are reachable. Closes
ticket 16695.
- Wrap Windows-only C files inside '#ifdef _WIN32' so that tools
that try to scan or compile every file on Unix won't decide that
they are broken.
- Remove the unused "nulterminate" argument from buf_pullup().
o Documentation:
- Recommend a 40 GB example AccountingMax in torrc.sample rather
than a 4 GB max. Closes ticket 16742.
- Include the TUNING document in our source tarball. It is referred
to in the ChangeLog and an error message. Fixes bug 16929; bugfix
on 0.2.6.1-alpha.
o Removed code:
- The internal pure-C tor-fw-helper tool is now removed from the Tor
distribution, in favor of the pure-Go clone available from
https://gitweb.torproject.org/tor-fw-helper.git/ . The libraries
used by the C tor-fw-helper are not, in our opinion, very
confidence- inspiring in their secure-programming techniques.
Closes ticket 13338.
- Remove the code that would try to aggressively flush controller
connections while writing to them. This code was introduced in
0.1.2.7-alpha, in order to keep output buffers from exceeding
their limits. But there is no longer a maximum output buffer size,
and flushing data in this way caused some undesirable recursions
in our call graph. Closes ticket 16480.
o Testing:
- Make "bridges+hs" the default test network. This tests almost all
tor functionality during make test-network, while allowing tests
to succeed on non-IPv6 systems. Requires chutney commit 396da92 in
test-network-bridges-hs. Closes tickets 16945 (tor) and 16946
(chutney). Patches by "teor".
- Autodetect CHUTNEY_PATH if the chutney and Tor sources are side-
by-side in the same parent directory. Closes ticket 16903. Patch
by "teor".
- Use environment variables rather than autoconf substitutions to
send variables from the build system to the test scripts. This
change should be easier to maintain, and cause 'make distcheck' to
work better than before. Fixes bug 17148.
- Add a new set of callgraph analysis scripts that use clang to
produce a list of which Tor functions are reachable from which
other Tor functions. We're planning to use these to help simplify
our code structure by identifying illogical dependencies.
- Add new 'test-full' and 'test-full-online' targets to run all
tests, including integration tests with stem and chutney.
- Make the test-workqueue test work on Windows by initializing the
network before we begin.
- New make target (make test-network-all) to run multiple applicable
chutney test cases. Patch from Teor; closes 16953.
- Unit test dns_resolve(), dns_clip_ttl() and dns_get_expiry_ttl()
functions in dns.c. Implements a portion of ticket 16831.
- When building Tor with testing coverage enabled, run Chutney tests
(if any) using the 'tor-cov' coverage binary.
- When running test-network or test-stem, check for the absence of
stem/chutney before doing any build operations.
Changes in version 0.2.7.2-alpha - 2015-07-27
This, the second alpha in the Tor 0.2.7 series, has a number of new
features, including a way to manually pick the number of introduction
points for hidden services, and the much stronger Ed25519 signing key
algorithm for regular Tor relays (including support for encrypted
offline identity keys in the new algorithm).
Support for Ed25519 on relays is currently limited to signing router
descriptors; later alphas in this series will extend Ed25519 key
support to more parts of the Tor protocol.
o Major features (Ed25519 identity keys, Proposal 220):
- All relays now maintain a stronger identity key, using the Ed25519
elliptic curve signature format. This master key is designed so
that it can be kept offline. Relays also generate an online
signing key, and a set of other Ed25519 keys and certificates.
These are all automatically regenerated and rotated as needed.
Implements part of ticket 12498.
- Directory authorities now vote on Ed25519 identity keys along with
RSA1024 keys. Implements part of ticket 12498.
- Directory authorities track which Ed25519 identity keys have been
used with which RSA1024 identity keys, and do not allow them to
vary freely. Implements part of ticket 12498.
- Microdescriptors now include Ed25519 identity keys. Implements
part of ticket 12498.
- Add support for offline encrypted Ed25519 master keys. To use this
feature on your tor relay, run "tor --keygen" to make a new master
key (or to make a new signing key if you already have a master
key). Closes ticket 13642.
o Major features (Hidden services):
- Add the torrc option HiddenServiceNumIntroductionPoints, to
specify a fixed number of introduction points. Its maximum value
is 10 and default is 3. Using this option can increase a hidden
service's reliability under load, at the cost of making it more
visible that the hidden service is facing extra load. Closes
ticket 4862.
- Remove the adaptive algorithm for choosing the number of
introduction points, which used to change the number of
introduction points (poorly) depending on the number of
connections the HS sees. Closes ticket 4862.
o Major features (onion key cross-certification):
- Relay descriptors now include signatures of their own identity
keys, made using the TAP and ntor onion keys. These signatures
allow relays to prove ownership of their own onion keys. Because
of this change, microdescriptors will no longer need to include
RSA identity keys. Implements proposal 228; closes ticket 12499.
o Major features (performance):
- Improve the runtime speed of Ed25519 operations by using the
public-domain Ed25519-donna by Andrew M. ("floodyberry").
Implements ticket 16467.
- Improve the runtime speed of the ntor handshake by using an
optimized curve25519 basepoint scalarmult implementation from the
public-domain Ed25519-donna by Andrew M. ("floodyberry"), based on
ideas by Adam Langley. Implements ticket 9663.
o Major bugfixes (client-side privacy, also in 0.2.6.9):
- Properly separate out each SOCKSPort when applying stream
isolation. The error occurred because each port's session group
was being overwritten by a default value when the listener
connection was initialized. Fixes bug 16247; bugfix on
0.2.6.3-alpha. Patch by "jojelino".
o Major bugfixes (hidden service clients, stability, also in 0.2.6.10):
- Stop refusing to store updated hidden service descriptors on a
client. This reverts commit 9407040c59218 (which indeed fixed bug
14219, but introduced a major hidden service reachability
regression detailed in bug 16381). This is a temporary fix since
we can live with the minor issue in bug 14219 (it just results in
some load on the network) but the regression of 16381 is too much
of a setback. First-round fix for bug 16381; bugfix
on 0.2.6.3-alpha.
o Major bugfixes (hidden services):
- When cannibalizing a circuit for an introduction point, always
extend to the chosen exit node (creating a 4 hop circuit).
Previously Tor would use the current circuit exit node, which
changed the original choice of introduction point, and could cause
the hidden service to skip excluded introduction points or
reconnect to a skipped introduction point. Fixes bug 16260; bugfix
on 0.1.0.1-rc.
o Major bugfixes (open file limit):
- The open file limit wasn't checked before calling
tor_accept_socket_nonblocking(), which would make Tor exceed the
limit. Now, before opening a new socket, Tor validates the open
file limit just before, and if the max has been reached, return an
error. Fixes bug 16288; bugfix on 0.1.1.1-alpha.
o Major bugfixes (stability, also in 0.2.6.10):
- Stop crashing with an assertion failure when parsing certain kinds
of malformed or truncated microdescriptors. Fixes bug 16400;
bugfix on 0.2.6.1-alpha. Found by "torkeln"; fix based on a patch
by "cypherpunks_backup".
- Stop random client-side assertion failures that could occur when
connecting to a busy hidden service, or connecting to a hidden
service while a NEWNYM is in progress. Fixes bug 16013; bugfix
on 0.1.0.1-rc.
o Minor features (directory authorities, security, also in 0.2.6.9):
- The HSDir flag given by authorities now requires the Stable flag.
For the current network, this results in going from 2887 to 2806
HSDirs. Also, it makes it harder for an attacker to launch a sybil
attack by raising the effort for a relay to become Stable to
require at the very least 7 days, while maintaining the 96 hours
uptime requirement for HSDir. Implements ticket 8243.
o Minor features (client):
- Relax the validation of hostnames in SOCKS5 requests, allowing the
character '_' to appear, in order to cope with domains observed in
the wild that are serving non-RFC compliant records. Resolves
ticket 16430.
- Relax the validation done to hostnames in SOCKS5 requests, and
allow a single trailing '.' to cope with clients that pass FQDNs
using that syntax to explicitly indicate that the domain name is
fully-qualified. Fixes bug 16674; bugfix on 0.2.6.2-alpha.
- Add GroupWritable and WorldWritable options to unix-socket based
SocksPort and ControlPort options. These options apply to a single
socket, and override {Control,Socks}SocketsGroupWritable. Closes
ticket 15220.
o Minor features (control protocol):
- Support network-liveness GETINFO key and NETWORK_LIVENESS event in
the control protocol. Resolves ticket 15358.
o Minor features (directory authorities):
- Directory authorities no longer vote against the "Fast", "Stable",
and "HSDir" flags just because they were going to vote against
"Running": if the consensus turns out to be that the router was
running, then the authority's vote should count. Patch from Peter
Retzlaff; closes issue 8712.
o Minor features (geoip, also in 0.2.6.10):
- Update geoip to the June 3 2015 Maxmind GeoLite2 Country database.
- Update geoip6 to the June 3 2015 Maxmind GeoLite2 Country database.
o Minor features (hidden services):
- Add the new options "HiddenServiceMaxStreams" and
"HiddenServiceMaxStreamsCloseCircuit" to allow hidden services to
limit the maximum number of simultaneous streams per circuit, and
optionally tear down the circuit when the limit is exceeded. Part
of ticket 16052.
o Minor features (portability):
- Use C99 variadic macros when the compiler is not GCC. This avoids
failing compilations on MSVC, and fixes a log-file-based race
condition in our old workarounds. Original patch from Gisle Vanem.
o Minor bugfixes (compilation, also in 0.2.6.9):
- Build with --enable-systemd correctly when libsystemd is
installed, but systemd is not. Fixes bug 16164; bugfix on
0.2.6.3-alpha. Patch from Peter Palfrader.
o Minor bugfixes (controller):
- Add the descriptor ID in each HS_DESC control event. It was
missing, but specified in control-spec.txt. Fixes bug 15881;
bugfix on 0.2.5.2-alpha.
o Minor bugfixes (crypto error-handling, also in 0.2.6.10):
- Check for failures from crypto_early_init, and refuse to continue.
A previous typo meant that we could keep going with an
uninitialized crypto library, and would have OpenSSL initialize
its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
when implementing ticket 4900. Patch by "teor".
o Minor bugfixes (hidden services):
- Fix a crash when reloading configuration while at least one
configured and one ephemeral hidden service exists. Fixes bug
16060; bugfix on 0.2.7.1-alpha.
- Avoid crashing with a double-free bug when we create an ephemeral
hidden service but adding it fails for some reason. Fixes bug
16228; bugfix on 0.2.7.1-alpha.
o Minor bugfixes (Linux seccomp2 sandbox):
- Use the sandbox in tor_open_cloexec whether or not O_CLOEXEC is
defined. Patch by "teor". Fixes bug 16515; bugfix on 0.2.3.1-alpha.
o Minor bugfixes (Linux seccomp2 sandbox, also in 0.2.6.10):
- Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
these when eventfd2() support is missing. Fixes bug 16363; bugfix
on 0.2.6.3-alpha. Patch from "teor".
o Minor bugfixes (Linux seccomp2 sandbox, also in 0.2.6.9):
- Fix sandboxing to work when running as a relay, by allowing the
renaming of secret_id_key, and allowing the eventfd2 and futex
syscalls. Fixes bug 16244; bugfix on 0.2.6.1-alpha. Patch by
Peter Palfrader.
- Allow systemd connections to work with the Linux seccomp2 sandbox
code. Fixes bug 16212; bugfix on 0.2.6.2-alpha. Patch by
Peter Palfrader.
o Minor bugfixes (relay):
- Fix a rarely-encountered memory leak when failing to initialize
the thread pool. Fixes bug 16631; bugfix on 0.2.6.3-alpha. Patch
from "cypherpunks".
o Minor bugfixes (systemd):
- Fix an accidental formatting error that broke the systemd
configuration file. Fixes bug 16152; bugfix on 0.2.7.1-alpha.
- Tor's systemd unit file no longer contains extraneous spaces.
These spaces would sometimes confuse tools like deb-systemd-
helper. Fixes bug 16162; bugfix on 0.2.5.5-alpha.
o Minor bugfixes (tests):
- Use the configured Python executable when running test-stem-full.
Fixes bug 16470; bugfix on 0.2.7.1-alpha.
o Minor bugfixes (tests, also in 0.2.6.9):
- Fix a crash in the unit tests when built with MSVC2013. Fixes bug
16030; bugfix on 0.2.6.2-alpha. Patch from "NewEraCracker".
o Minor bugfixes (threads, comments):
- Always initialize return value in compute_desc_id in rendcommon.c
Patch by "teor". Fixes part of bug 16115; bugfix on 0.2.7.1-alpha.
- Check for NULL values in getinfo_helper_onions(). Patch by "teor".
Fixes part of bug 16115; bugfix on 0.2.7.1-alpha.
- Remove undefined directive-in-macro in test_util_writepid clang
3.7 complains that using a preprocessor directive inside a macro
invocation in test_util_writepid in test_util.c is undefined.
Patch by "teor". Fixes part of bug 16115; bugfix on 0.2.7.1-alpha.
o Code simplification and refactoring:
- Define WINVER and _WIN32_WINNT centrally, in orconfig.h, in order
to ensure they remain consistent and visible everywhere.
- Remove some vestigial workarounds for the MSVC6 compiler. We
haven't supported that in ages.
- The link authentication code has been refactored for better
testability and reliability. It now uses code generated with the
"trunnel" binary encoding generator, to reduce the risk of bugs
due to programmer error. Done as part of ticket 12498.
o Documentation:
- Include a specific and (hopefully) accurate documentation of the
torrc file's meta-format in doc/torrc_format.txt. This is mainly
of interest to people writing programs to parse or generate torrc
files. This document is not a commitment to long-term
compatibility; some aspects of the current format are a bit
ridiculous. Closes ticket 2325.
o Removed features:
- Tor no longer supports copies of OpenSSL that are missing support
for Elliptic Curve Cryptography. (We began using ECC when
available in 0.2.4.8-alpha, for more safe and efficient key
negotiation.) In particular, support for at least one of P256 or
P224 is now required, with manual configuration needed if only
P224 is available. Resolves ticket 16140.
- Tor no longer supports versions of OpenSSL before 1.0. (If you are
on an operating system that has not upgraded to OpenSSL 1.0 or
later, and you compile Tor from source, you will need to install a
more recent OpenSSL to link Tor against.) These versions of
OpenSSL are still supported by the OpenSSL, but the numerous
cryptographic improvements in later OpenSSL releases makes them a
clear choice. Resolves ticket 16034.
- Remove the HidServDirectoryV2 option. Now all relays offer to
store hidden service descriptors. Related to 16543.
- Remove the VoteOnHidServDirectoriesV2 option, since all
authorities have long set it to 1. Closes ticket 16543.
o Testing:
- Document use of coverity, clang static analyzer, and clang dynamic
undefined behavior and address sanitizers in doc/HACKING. Include
detailed usage instructions in the blacklist. Patch by "teor".
Closes ticket 15817.
- The link authentication protocol code now has extensive tests.
- The relay descriptor signature testing code now has
extensive tests.
- The test_workqueue program now runs faster, and is enabled by
default as a part of "make check".
- Now that OpenSSL has its own scrypt implementation, add an unit
test that checks for interoperability between libscrypt_scrypt()
and OpenSSL's EVP_PBE_scrypt() so that we could not use libscrypt
and rely on EVP_PBE_scrypt() whenever possible. Resolves
ticket 16189.
Changes in version 0.2.6.10 - 2015-07-12
Tor version 0.2.6.10 fixes some significant stability and hidden
service client bugs, bulletproofs the cryptography init process, and
fixes a bug when using the sandbox code with some older versions of
Linux. Everyone running an older version, especially an older version
of 0.2.6, should upgrade.
o Major bugfixes (hidden service clients, stability):
- Stop refusing to store updated hidden service descriptors on a
client. This reverts commit 9407040c59218 (which indeed fixed bug
14219, but introduced a major hidden service reachability
regression detailed in bug 16381). This is a temporary fix since
we can live with the minor issue in bug 14219 (it just results in
some load on the network) but the regression of 16381 is too much
of a setback. First-round fix for bug 16381; bugfix
on 0.2.6.3-alpha.
o Major bugfixes (stability):
- Stop crashing with an assertion failure when parsing certain kinds
of malformed or truncated microdescriptors. Fixes bug 16400;
bugfix on 0.2.6.1-alpha. Found by "torkeln"; fix based on a patch
by "cypherpunks_backup".
- Stop random client-side assertion failures that could occur when
connecting to a busy hidden service, or connecting to a hidden
service while a NEWNYM is in progress. Fixes bug 16013; bugfix
on 0.1.0.1-rc.
o Minor features (geoip):
- Update geoip to the June 3 2015 Maxmind GeoLite2 Country database.
- Update geoip6 to the June 3 2015 Maxmind GeoLite2 Country database.
o Minor bugfixes (crypto error-handling):
- Check for failures from crypto_early_init, and refuse to continue.
A previous typo meant that we could keep going with an
uninitialized crypto library, and would have OpenSSL initialize
its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
when implementing ticket 4900. Patch by "teor".
o Minor bugfixes (Linux seccomp2 sandbox):
- Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
these when eventfd2() support is missing. Fixes bug 16363; bugfix
on 0.2.6.3-alpha. Patch from "teor".
Changes in version 0.2.6.9 - 2015-06-11
Tor 0.2.6.9 fixes a regression in the circuit isolation code, increases the
requirements for receiving an HSDir flag, and addresses some other small
bugs in the systemd and sandbox code. Clients using circuit isolation
should upgrade; all directory authorities should upgrade.
o Major bugfixes (client-side privacy):
- Properly separate out each SOCKSPort when applying stream
isolation. The error occurred because each port's session group was
being overwritten by a default value when the listener connection
was initialized. Fixes bug 16247; bugfix on 0.2.6.3-alpha. Patch
by "jojelino".
o Minor feature (directory authorities, security):
- The HSDir flag given by authorities now requires the Stable flag.
For the current network, this results in going from 2887 to 2806
HSDirs. Also, it makes it harder for an attacker to launch a sybil
attack by raising the effort for a relay to become Stable which
takes at the very least 7 days to do so and by keeping the 96
hours uptime requirement for HSDir. Implements ticket 8243.
o Minor bugfixes (compilation):
- Build with --enable-systemd correctly when libsystemd is
installed, but systemd is not. Fixes bug 16164; bugfix on
0.2.6.3-alpha. Patch from Peter Palfrader.
o Minor bugfixes (Linux seccomp2 sandbox):
- Fix sandboxing to work when running as a relaymby renaming of
secret_id_key, and allowing the eventfd2 and futex syscalls. Fixes
bug 16244; bugfix on 0.2.6.1-alpha. Patch by Peter Palfrader.
- Allow systemd connections to work with the Linux seccomp2 sandbox
code. Fixes bug 16212; bugfix on 0.2.6.2-alpha. Patch by
Peter Palfrader.
o Minor bugfixes (tests):
- Fix a crash in the unit tests when built with MSVC2013. Fixes bug
16030; bugfix on 0.2.6.2-alpha. Patch from "NewEraCracker".
Changes in version 0.2.6.8 - 2015-05-21
Tor 0.2.6.8 fixes a bit of dodgy code in parsing INTRODUCE2 cells, and
fixes an authority-side bug in assigning the HSDir flag. All directory
authorities should upgrade.
o Major bugfixes (hidden services, backport from 0.2.7.1-alpha):
- Revert commit that made directory authorities assign the HSDir
flag to relays without a DirPort; this was bad because such relays
can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
on 0.2.6.3-alpha.
o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
- Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
a client authorized hidden service. Fixes bug 15823; bugfix
on 0.2.1.6-alpha.
o Minor features (geoip):
- Update geoip to the April 8 2015 Maxmind GeoLite2 Country database.
- Update geoip6 to the April 8 2015 Maxmind GeoLite2
Country database.
Changes in version 0.2.7.1-alpha - 2015-05-12
Tor 0.2.7.1-alpha is the first alpha release in its series. It
includes numerous small features and bugfixes against previous Tor
versions, and numerous small infrastructure improvements. The most
notable features are several new ways for controllers to interact with
the hidden services subsystem.
o New system requirements:
- Tor no longer includes workarounds to support Libevent versions
before 1.3e. Libevent 2.0 or later is recommended. Closes
ticket 15248.
o Major features (controller):
- Add the ADD_ONION and DEL_ONION commands that allow the creation
and management of hidden services via the controller. Closes
ticket 6411.
- New "GETINFO onions/current" and "GETINFO onions/detached"
commands to get information about hidden services created via the
controller. Part of ticket 6411.
- New HSFETCH command to launch a request for a hidden service
descriptor. Closes ticket 14847.
- New HSPOST command to upload a hidden service descriptor. Closes
ticket 3523. Patch by "DonnchaC".
o Major bugfixes (hidden services):
- Revert commit that made directory authorities assign the HSDir
flag to relays without a DirPort; this was bad because such relays
can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
on 0.2.6.3-alpha.
o Minor features (clock-jump tolerance):
- Recover better when our clock jumps back many hours, like might
happen for Tails or Whonix users who start with a very wrong
hardware clock, use Tor to discover a more accurate time, and then
fix their clock. Resolves part of ticket 8766.
o Minor features (command-line interface):
- Make --hash-password imply --hush to prevent unnecessary noise.
Closes ticket 15542. Patch from "cypherpunks".
- Print a warning whenever we find a relative file path being used
as torrc option. Resolves issue 14018.
o Minor features (controller):
- Add DirAuthority lines for default directory authorities to the
output of the "GETINFO config/defaults" command if not already
present. Implements ticket 14840.
- Controllers can now use "GETINFO hs/client/desc/id/..." to
retrieve items from the client's hidden service descriptor cache.
Closes ticket 14845.
- Implement a new controller command "GETINFO status/fresh-relay-
descs" to fetch a descriptor/extrainfo pair that was generated on
demand just for the controller's use. Implements ticket 14784.
o Minor features (DoS-resistance):
- Make it harder for attackers to overload hidden services with
introductions, by blocking multiple introduction requests on the
same circuit. Resolves ticket 15515.
o Minor features (geoip):
- Update geoip to the April 8 2015 Maxmind GeoLite2 Country database.
- Update geoip6 to the April 8 2015 Maxmind GeoLite2
Country database.
o Minor features (HS popularity countermeasure):
- To avoid leaking HS popularity, don't cycle the introduction point
when we've handled a fixed number of INTRODUCE2 cells but instead
cycle it when a random number of introductions is reached, thus
making it more difficult for an attacker to find out the amount of
clients that have used the introduction point for a specific HS.
Closes ticket 15745.
o Minor features (logging):
- Include the Tor version in all LD_BUG log messages, since people
tend to cut and paste those into the bugtracker. Implements
ticket 15026.
o Minor features (pluggable transports):
- When launching managed pluggable transports on Linux systems,
attempt to have the kernel deliver a SIGTERM on tor exit if the
pluggable transport process is still running. Resolves
ticket 15471.
- When launching managed pluggable transports, setup a valid open
stdin in the child process that can be used to detect if tor has
terminated. The "TOR_PT_EXIT_ON_STDIN_CLOSE" environment variable
can be used by implementations to detect this new behavior.
Resolves ticket 15435.
o Minor features (testing):
- Add a test to verify that the compiler does not eliminate our
memwipe() implementation. Closes ticket 15377.
- Add make rule `check-changes` to verify the format of changes
files. Closes ticket 15180.
- Add unit tests for control_event_is_interesting(). Add a compile-
time check that the number of events doesn't exceed the capacity
of control_event_t.event_mask. Closes ticket 15431, checks for
bugs similar to 13085. Patch by "teor".
- Command-line argument tests moved to Stem. Resolves ticket 14806.
- Integrate the ntor, backtrace, and zero-length keys tests into the
automake test suite. Closes ticket 15344.
- Remove assertions during builds to determine Tor's test coverage.
We don't want to trigger these even in assertions, so including
them artificially makes our branch coverage look worse than it is.
This patch provides the new test-stem-full and coverage-html-full
configure options. Implements ticket 15400.
o Minor bugfixes (build):
- Improve out-of-tree builds by making non-standard rules work and
clean up additional files and directories. Fixes bug 15053; bugfix
on 0.2.7.0-alpha.
o Minor bugfixes (command-line interface):
- When "--quiet" is provided along with "--validate-config", do not
write anything to stdout on success. Fixes bug 14994; bugfix
on 0.2.3.3-alpha.
- When complaining about bad arguments to "--dump-config", use
stderr, not stdout.
o Minor bugfixes (configuration, unit tests):
- Only add the default fallback directories when the DirAuthorities,
AlternateDirAuthority, and FallbackDir directory config options
are set to their defaults. The default fallback directory list is
currently empty, this fix will only change tor's behavior when it
has default fallback directories. Includes unit tests for
consider_adding_dir_servers(). Fixes bug 15642; bugfix on
90f6071d8dc0 in 0.2.4.7-alpha. Patch by "teor".
o Minor bugfixes (correctness):
- For correctness, avoid modifying a constant string in
handle_control_postdescriptor. Fixes bug 15546; bugfix
on 0.1.1.16-rc.
- Remove side-effects from tor_assert() calls. This was harmless,
because we never disable assertions, but it is bad style and
unnecessary. Fixes bug 15211; bugfix on 0.2.5.5, 0.2.2.36,
and 0.2.0.10.
o Minor bugfixes (hidden service):
- Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
a client authorized hidden service. Fixes bug 15823; bugfix
on 0.2.1.6-alpha.
- Remove an extraneous newline character from the end of hidden
service descriptors. Fixes bug 15296; bugfix on 0.2.0.10-alpha.
o Minor bugfixes (interface):
- Print usage information for --dump-config when it is used without
an argument. Also, fix the error message to use different wording
and add newline at the end. Fixes bug 15541; bugfix
on 0.2.5.1-alpha.
o Minor bugfixes (logs):
- When building Tor under Clang, do not include an extra set of
parentheses in log messages that include function names. Fixes bug
15269; bugfix on every released version of Tor when compiled with
recent enough Clang.
o Minor bugfixes (network):
- When attempting to use fallback technique for network interface
lookup, disregard loopback and multicast addresses since they are
unsuitable for public communications.
o Minor bugfixes (statistics):
- Disregard the ConnDirectionStatistics torrc options when Tor is
not a relay since in that mode of operation no sensible data is
being collected and because Tor might run into measurement hiccups
when running as a client for some time, then becoming a relay.
Fixes bug 15604; bugfix on 0.2.2.35.
o Minor bugfixes (test networks):
- When self-testing reachability, use ExtendAllowPrivateAddresses to
determine if local/private addresses imply reachability. The
previous fix used TestingTorNetwork, which implies
ExtendAllowPrivateAddresses, but this excluded rare configurations
where ExtendAllowPrivateAddresses is set but TestingTorNetwork is
not. Fixes bug 15771; bugfix on 0.2.6.1-alpha. Patch by "teor",
issue discovered by CJ Ess.
o Minor bugfixes (testing):
- Check for matching value in server response in ntor_ref.py. Fixes
bug 15591; bugfix on 0.2.4.8-alpha. Reported and fixed
by "joelanders".
- Set the severity correctly when testing
get_interface_addresses_ifaddrs() and
get_interface_addresses_win32(), so that the tests fail gracefully
instead of triggering an assertion. Fixes bug 15759; bugfix on
0.2.6.3-alpha. Reported by Nicolas Derive.
o Code simplification and refactoring:
- Move the hacky fallback code out of get_interface_address6() into
separate function and get it covered with unit-tests. Resolves
ticket 14710.
- Refactor hidden service client-side cache lookup to intelligently
report its various failure cases, and disentangle failure cases
involving a lack of introduction points. Closes ticket 14391.
- Use our own Base64 encoder instead of OpenSSL's, to allow more
control over the output. Part of ticket 15652.
o Documentation:
- Improve the descriptions of statistics-related torrc options in
the manpage to describe rationale and possible uses cases. Fixes
issue 15550.
- Improve the layout and formatting of ./configure --help messages.
Closes ticket 15024. Patch from "cypherpunks".
- Standardize on the term "server descriptor" in the manual page.
Previously, we had used "router descriptor", "server descriptor",
and "relay descriptor" interchangeably. Part of ticket 14987.
o Removed code:
- Remove `USE_OPENSSL_BASE64` and the corresponding fallback code
and always use the internal Base64 decoder. The internal decoder
has been part of tor since 0.2.0.10-alpha, and no one should
be using the OpenSSL one. Part of ticket 15652.
- Remove the 'tor_strclear()' function; use memwipe() instead.
Closes ticket 14922.
o Removed features:
- Remove the (seldom-used) DynamicDHGroups feature. For anti-
fingerprinting we now recommend pluggable transports; for forward-
secrecy in TLS, we now use the P-256 group. Closes ticket 13736.
- Remove the undocumented "--digests" command-line option. It
complicated our build process, caused subtle build issues on
multiple platforms, and is now redundant since we started
including git version identifiers. Closes ticket 14742.
- Tor no longer contains checks for ancient directory cache versions
that didn't know about microdescriptors.
- Tor no longer contains workarounds for stat files generated by
super-old versions of Tor that didn't choose guards sensibly.
Changes in version 0.2.4.27 - 2015-04-06
Tor 0.2.4.27 backports two fixes from 0.2.6.7 for security issues that
could be used by an attacker to crash hidden services, or crash clients
visiting hidden services. Hidden services should upgrade as soon as
possible; clients should upgrade whenever packages become available.
This release also backports a simple improvement to make hidden
services a bit less vulnerable to denial-of-service attacks.
o Major bugfixes (security, hidden service):
- Fix an issue that would allow a malicious client to trigger an
assertion failure and halt a hidden service. Fixes bug 15600;
bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
- Fix a bug that could cause a client to crash with an assertion
failure when parsing a malformed hidden service descriptor. Fixes
bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
o Minor features (DoS-resistance, hidden service):
- Introduction points no longer allow multiple INTRODUCE1 cells to
arrive on the same circuit. This should make it more expensive for
attackers to overwhelm hidden services with introductions.
Resolves ticket 15515.
Changes in version 0.2.5.12 - 2015-04-06
Tor 0.2.5.12 backports two fixes from 0.2.6.7 for security issues that
could be used by an attacker to crash hidden services, or crash clients
visiting hidden services. Hidden services should upgrade as soon as
possible; clients should upgrade whenever packages become available.
This release also backports a simple improvement to make hidden
services a bit less vulnerable to denial-of-service attacks.
o Major bugfixes (security, hidden service):
- Fix an issue that would allow a malicious client to trigger an
assertion failure and halt a hidden service. Fixes bug 15600;
bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
- Fix a bug that could cause a client to crash with an assertion
failure when parsing a malformed hidden service descriptor. Fixes
bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
o Minor features (DoS-resistance, hidden service):
- Introduction points no longer allow multiple INTRODUCE1 cells to
arrive on the same circuit. This should make it more expensive for
attackers to overwhelm hidden services with introductions.
Resolves ticket 15515.
Changes in version 0.2.6.7 - 2015-04-06
Tor 0.2.6.7 fixes two security issues that could be used by an
attacker to crash hidden services, or crash clients visiting hidden
services. Hidden services should upgrade as soon as possible; clients
should upgrade whenever packages become available.
This release also contains two simple improvements to make hidden
services a bit less vulnerable to denial-of-service attacks.
o Major bugfixes (security, hidden service):
- Fix an issue that would allow a malicious client to trigger an
assertion failure and halt a hidden service. Fixes bug 15600;
bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
- Fix a bug that could cause a client to crash with an assertion
failure when parsing a malformed hidden service descriptor. Fixes
bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
o Minor features (DoS-resistance, hidden service):
- Introduction points no longer allow multiple INTRODUCE1 cells to
arrive on the same circuit. This should make it more expensive for
attackers to overwhelm hidden services with introductions.
Resolves ticket 15515.
- Decrease the amount of reattempts that a hidden service performs
when its rendezvous circuits fail. This reduces the computational
cost for running a hidden service under heavy load. Resolves
ticket 11447.
Changes in version 0.2.6.6 - 2015-03-24
Tor 0.2.6.6 is the first stable release in the 0.2.6 series.
It adds numerous safety, security, correctness, and performance
improvements. Client programs can be configured to use more kinds of
sockets, AutomapHosts works better, the multithreading backend is
improved, cell transmission is refactored, test coverage is much
higher, more denial-of-service attacks are handled, guard selection is
improved to handle long-term guards better, pluggable transports
should work a bit better, and some annoying hidden service performance
bugs should be addressed.
o Minor bugfixes (portability):
- Use the correct datatype in the SipHash-2-4 function to prevent
compilers from assuming any sort of alignment. Fixes bug 15436;
bugfix on 0.2.5.3-alpha.
Changes in version 0.2.6.5-rc - 2015-03-18
Tor 0.2.6.5-rc is the second and (hopefully) last release candidate in
the 0.2.6. It fixes a small number of bugs found in 0.2.6.4-rc.
o Major bugfixes (client):
- Avoid crashing when making certain configuration option changes on
clients. Fixes bug 15245; bugfix on 0.2.6.3-alpha. Reported
by "anonym".
o Major bugfixes (pluggable transports):
- Initialize the extended OR Port authentication cookie before
launching pluggable transports. This prevents a race condition
that occurred when server-side pluggable transports would cache the
authentication cookie before it has been (re)generated. Fixes bug
15240; bugfix on 0.2.5.1-alpha.
o Major bugfixes (portability):
- Do not crash on startup when running on Solaris. Fixes a bug
related to our fix for 9495; bugfix on 0.2.6.1-alpha. Reported
by "ruebezahl".
o Minor features (heartbeat):
- On relays, report how many connections we negotiated using each
version of the Tor link protocols. This information will let us
know if removing support for very old versions of the Tor
protocols is harming the network. Closes ticket 15212.
o Code simplification and refactoring:
- Refactor main loop to extract the 'loop' part. This makes it
easier to run Tor under Shadow. Closes ticket 15176.
Changes in version 0.2.5.11 - 2015-03-17
Tor 0.2.5.11 is the second stable release in the 0.2.5 series.
It backports several bugfixes from the 0.2.6 branch, including a
couple of medium-level security fixes for relays and exit nodes.
It also updates the list of directory authorities.
o Directory authority changes:
- Remove turtles as a directory authority.
- Add longclaw as a new (v3) directory authority. This implements
ticket 13296. This keeps the directory authority count at 9.
- The directory authority Faravahar has a new IP address. This
closes ticket 14487.
o Major bugfixes (crash, OSX, security):
- Fix a remote denial-of-service opportunity caused by a bug in
OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
in OSX 10.9.
o Major bugfixes (relay, stability, possible security):
- Fix a bug that could lead to a relay crashing with an assertion
failure if a buffer of exactly the wrong layout was passed to
buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
0.2.0.10-alpha. Patch from 'cypherpunks'.
- Do not assert if the 'data' pointer on a buffer is advanced to the
very end of the buffer; log a BUG message instead. Only assert if
it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
o Major bugfixes (exit node stability):
- Fix an assertion failure that could occur under high DNS load.
Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
diagnosed and fixed by "cypherpunks".
o Major bugfixes (Linux seccomp2 sandbox):
- Upon receiving sighup with the seccomp2 sandbox enabled, do not
crash during attempts to call wait4. Fixes bug 15088; bugfix on
0.2.5.1-alpha. Patch from "sanic".
o Minor features (controller):
- New "GETINFO bw-event-cache" to get information about recent
bandwidth events. Closes ticket 14128. Useful for controllers to
get recent bandwidth history after the fix for ticket 13988.
o Minor features (geoip):
- Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
- Update geoip6 to the March 3 2015 Maxmind GeoLite2
Country database.
o Minor bugfixes (client, automapping):
- Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
no value follows the option. Fixes bug 14142; bugfix on
0.2.4.7-alpha. Patch by "teor".
- Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
14195; bugfix on 0.1.0.1-rc.
o Minor bugfixes (compilation):
- Build without warnings with the stock OpenSSL srtp.h header, which
has a duplicate declaration of SSL_get_selected_srtp_profile().
Fixes bug 14220; this is OpenSSL's bug, not ours.
o Minor bugfixes (directory authority):
- Allow directory authorities to fetch more data from one another if
they find themselves missing lots of votes. Previously, they had
been bumping against the 10 MB queued data limit. Fixes bug 14261;
bugfix on 0.1.2.5-alpha.
- Enlarge the buffer to read bwauth generated files to avoid an
issue when parsing the file in dirserv_read_measured_bandwidths().
Fixes bug 14125; bugfix on 0.2.2.1-alpha.
o Minor bugfixes (statistics):
- Increase period over which bandwidth observations are aggregated
from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
o Minor bugfixes (preventative security, C safety):
- When reading a hexadecimal, base-32, or base-64 encoded value from
a string, always overwrite the whole output buffer. This prevents
some bugs where we would look at (but fortunately, not reveal)
uninitialized memory on the stack. Fixes bug 14013; bugfix on all
versions of Tor.
Changes in version 0.2.4.26 - 2015-03-17
Tor 0.2.4.26 includes an updated list of directory authorities. It
also backports a couple of stability and security bugfixes from 0.2.5
and beyond.
o Directory authority changes:
- Remove turtles as a directory authority.
- Add longclaw as a new (v3) directory authority. This implements
ticket 13296. This keeps the directory authority count at 9.
- The directory authority Faravahar has a new IP address. This
closes ticket 14487.
o Major bugfixes (exit node stability, also in 0.2.6.3-alpha):
- Fix an assertion failure that could occur under high DNS load.
Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
diagnosed and fixed by "cypherpunks".
o Major bugfixes (relay, stability, possible security, also in 0.2.6.4-rc):
- Fix a bug that could lead to a relay crashing with an assertion
failure if a buffer of exactly the wrong layout was passed to
buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
0.2.0.10-alpha. Patch from 'cypherpunks'.
- Do not assert if the 'data' pointer on a buffer is advanced to the
very end of the buffer; log a BUG message instead. Only assert if
it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
o Minor features (geoip):
- Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
- Update geoip6 to the March 3 2015 Maxmind GeoLite2
Country database.
Changes in version 0.2.6.4-rc - 2015-03-09
Tor 0.2.6.4-alpha fixes an issue in the directory code that an
attacker might be able to use in order to crash certain Tor
directories. It also resolves some minor issues left over from, or
introduced in, Tor 0.2.6.3-alpha or earlier.
o Major bugfixes (crash, OSX, security):
- Fix a remote denial-of-service opportunity caused by a bug in
OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
in OSX 10.9.
o Major bugfixes (relay, stability, possible security):
- Fix a bug that could lead to a relay crashing with an assertion
failure if a buffer of exactly the wrong layout is passed to
buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
0.2.0.10-alpha. Patch from "cypherpunks".
- Do not assert if the 'data' pointer on a buffer is advanced to the
very end of the buffer; log a BUG message instead. Only assert if
it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
o Major bugfixes (FreeBSD IPFW transparent proxy):
- Fix address detection with FreeBSD transparent proxies, when
"TransProxyType ipfw" is in use. Fixes bug 15064; bugfix
on 0.2.5.4-alpha.
o Major bugfixes (Linux seccomp2 sandbox):
- Pass IPPROTO_TCP rather than 0 to socket(), so that the Linux
seccomp2 sandbox doesn't fail. Fixes bug 14989; bugfix
on 0.2.6.3-alpha.
- Allow AF_UNIX hidden services to be used with the seccomp2
sandbox. Fixes bug 15003; bugfix on 0.2.6.3-alpha.
- Upon receiving sighup with the seccomp2 sandbox enabled, do not
crash during attempts to call wait4. Fixes bug 15088; bugfix on
0.2.5.1-alpha. Patch from "sanic".
o Minor features (controller):
- Messages about problems in the bootstrap process now include
information about the server we were trying to connect to when we
noticed the problem. Closes ticket 15006.
o Minor features (geoip):
- Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
- Update geoip6 to the March 3 2015 Maxmind GeoLite2
Country database.
o Minor features (logs):
- Quiet some log messages in the heartbeat and at startup. Closes
ticket 14950.
o Minor bugfixes (certificate handling):
- If an authority operator accidentally makes a signing certificate
with a future publication time, do not discard its real signing
certificates. Fixes bug 11457; bugfix on 0.2.0.3-alpha.
- Remove any old authority certificates that have been superseded
for at least two days. Previously, we would keep superseded
certificates until they expired, if they were published close in
time to the certificate that superseded them. Fixes bug 11454;
bugfix on 0.2.1.8-alpha.
o Minor bugfixes (compilation):
- Fix a compilation warning on s390. Fixes bug 14988; bugfix
on 0.2.5.2-alpha.
- Fix a compilation warning on FreeBSD. Fixes bug 15151; bugfix
on 0.2.6.2-alpha.
o Minor bugfixes (testing):
- Fix endianness issues in unit test for resolve_my_address() to
have it pass on big endian systems. Fixes bug 14980; bugfix on
Tor 0.2.6.3-alpha.
- Avoid a side-effect in a tor_assert() in the unit tests. Fixes bug
15188; bugfix on 0.1.2.3-alpha. Patch from Tom van der Woerdt.
- When running the new 'make test-stem' target, use the configured
python binary. Fixes bug 15037; bugfix on 0.2.6.3-alpha. Patch
from "cypherpunks".
- When running the zero-length-keys tests, do not use the default
torrc file. Fixes bug 15033; bugfix on 0.2.6.3-alpha. Reported
by "reezer".
o Directory authority IP change:
- The directory authority Faravahar has a new IP address. This
closes ticket 14487.
o Removed code:
- Remove some lingering dead code that once supported mempools.
Mempools were disabled by default in 0.2.5, and removed entirely
in 0.2.6.3-alpha. Closes more of ticket 14848; patch
by "cypherpunks".
Changes in version 0.2.6.3-alpha - 2015-02-19
Tor 0.2.6.3-alpha is the third (and hopefully final) alpha release in
the 0.2.6.x series. It introduces support for more kinds of sockets,
makes it harder to accidentally run an exit, improves our
multithreading backend, incorporates several fixes for the
AutomapHostsOnResolve option, and fixes numerous other bugs besides.
If no major regressions or security holes are found in this version,
the next version will be a release candidate.
o Deprecated versions:
- Tor relays older than 0.2.4.18-rc are no longer allowed to
advertise themselves on the network. Closes ticket 13555.
o Major features (security, unix domain sockets):
- Allow SocksPort to be an AF_UNIX Unix Domain Socket. Now high risk
applications can reach Tor without having to create AF_INET or
AF_INET6 sockets, meaning they can completely disable their
ability to make non-Tor network connections. To create a socket of
this type, use "SocksPort unix:/path/to/socket". Implements
ticket 12585.
- Support mapping hidden service virtual ports to AF_UNIX sockets.
The syntax is "HiddenServicePort 80 unix:/path/to/socket".
Implements ticket 11485.
o Major features (changed defaults):
- Prevent relay operators from unintentionally running exits: When a
relay is configured as an exit node, we now warn the user unless
the "ExitRelay" option is set to 1. We warn even more loudly if
the relay is configured with the default exit policy, since this
can indicate accidental misconfiguration. Setting "ExitRelay 0"
stops Tor from running as an exit relay. Closes ticket 10067.
o Major features (directory system):
- When downloading server- or microdescriptors from a directory
server, we no longer launch multiple simultaneous requests to the
same server. This reduces load on the directory servers,
especially when directory guards are in use. Closes ticket 9969.
- When downloading server- or microdescriptors over a tunneled
connection, do not limit the length of our requests to what the
Squid proxy is willing to handle. Part of ticket 9969.
- Authorities can now vote on the correct digests and latest
versions for different software packages. This allows packages
that include Tor to use the Tor authority system as a way to get
notified of updates and their correct digests. Implements proposal
227. Closes ticket 10395.
o Major features (guards):
- Introduce the Guardfraction feature to improves load balancing on
guard nodes. Specifically, it aims to reduce the traffic gap that
guard nodes experience when they first get the Guard flag. This is
a required step if we want to increase the guard lifetime to 9
months or greater. Closes ticket 9321.
o Major features (performance):
- Make the CPU worker implementation more efficient by avoiding the
kernel and lengthening pipelines. The original implementation used
sockets to transfer data from the main thread to the workers, and
didn't allow any thread to be assigned more than a single piece of
work at once. The new implementation avoids communications
overhead by making requests in shared memory, avoiding kernel IO
where possible, and keeping more requests in flight at once.
Implements ticket 9682.
o Major features (relay):
- Raise the minimum acceptable configured bandwidth rate for bridges
to 50 KiB/sec and for relays to 75 KiB/sec. (The old values were
20 KiB/sec.) Closes ticket 13822.
o Major bugfixes (exit node stability):
- Fix an assertion failure that could occur under high DNS load.
Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
diagnosed and fixed by "cypherpunks".
o Major bugfixes (mixed relay-client operation):
- When running as a relay and client at the same time (not
recommended), if we decide not to use a new guard because we want
to retry older guards, only close the locally-originating circuits
passing through that guard. Previously we would close all the
circuits through that guard. Fixes bug 9819; bugfix on
0.2.1.1-alpha. Reported by "skruffy".
o Minor features (build):
- New --disable-system-torrc compile-time option to prevent Tor from
looking for the system-wide torrc or torrc-defaults files.
Resolves ticket 13037.
o Minor features (controller):
- Include SOCKS_USERNAME and SOCKS_PASSWORD values in controller
events so controllers can observe circuit isolation inputs. Closes
ticket 8405.
- ControlPort now supports the unix:/path/to/socket syntax as an
alternative to the ControlSocket option, for consistency with
SocksPort and HiddenServicePort. Closes ticket 14451.
- New "GETINFO bw-event-cache" to get information about recent
bandwidth events. Closes ticket 14128. Useful for controllers to
get recent bandwidth history after the fix for ticket 13988.
o Minor features (Denial of service resistance):
- Count the total number of bytes used storing hidden service
descriptors against the value of MaxMemInQueues. If we're low on
memory, and more than 20% of our memory is used holding hidden
service descriptors, free them until no more than 10% of our
memory holds hidden service descriptors. Free the least recently
fetched descriptors first. Resolves ticket 13806.
- When we have recently been under memory pressure (over 3/4 of
MaxMemInQueues is allocated), then allocate smaller zlib objects
for small requests. Closes ticket 11791.
o Minor features (geoip):
- Update geoip and geoip6 files to the January 7 2015 Maxmind
GeoLite2 Country database.
o Minor features (guard nodes):
- Reduce the time delay before saving guard status to disk from 10
minutes to 30 seconds (or from one hour to 10 minutes if
AvoidDiskWrites is set). Closes ticket 12485.
o Minor features (hidden service):
- Make Sybil attacks against hidden services harder by changing the
minimum time required to get the HSDir flag from 25 hours up to 96
hours. Addresses ticket 14149.
- New option "HiddenServiceAllowUnknownPorts" to allow hidden
services to disable the anti-scanning feature introduced in
0.2.6.2-alpha. With this option not set, a connection to an
unlisted port closes the circuit. With this option set, only a
RELAY_DONE cell is sent. Closes ticket 14084.
o Minor features (interface):
- Implement "-f -" command-line option to read torrc configuration
from standard input, if you don't want to store the torrc file in
the file system. Implements feature 13865.
o Minor features (logging):
- Add a count of unique clients to the bridge heartbeat message.
Resolves ticket 6852.
- Suppress "router info incompatible with extra info" message when
reading extrainfo documents from cache. (This message got loud
around when we closed bug 9812 in 0.2.6.2-alpha.) Closes
ticket 13762.
- Elevate hidden service authorized-client message from DEBUG to
INFO. Closes ticket 14015.
o Minor features (stability):
- Add assertions in our hash-table iteration code to check for
corrupted values that could cause infinite loops. Closes
ticket 11737.
o Minor features (systemd):
- Various improvements and modernizations in systemd hardening
support. Closes ticket 13805. Patch from Craig Andrews.
o Minor features (testing networks):
- Drop the minimum RendPostPeriod on a testing network to 5 seconds,
and the default on a testing network to 2 minutes. Drop the
MIN_REND_INITIAL_POST_DELAY on a testing network to 5 seconds, but
keep the default on a testing network at 30 seconds. This reduces
HS bootstrap time to around 25 seconds. Also, change the default
time in test-network.sh to match. Closes ticket 13401. Patch
by "teor".
- Create TestingDirAuthVoteHSDir to correspond to
TestingDirAuthVoteExit/Guard. Ensures that authorities vote the
HSDir flag for the listed relays regardless of uptime or ORPort
connectivity. Respects the value of VoteOnHidServDirectoriesV2.
Partial implementation for ticket 14067. Patch by "teor".
o Minor features (tor2web mode):
- Introduce the config option Tor2webRendezvousPoints, which allows
clients in Tor2webMode to select a specific Rendezvous Point to be
used in HS circuits. This might allow better performance for
Tor2Web nodes. Implements ticket 12844.
o Minor bugfixes (client DNS):
- Report the correct cached DNS expiration times on SOCKS port or in
DNS replies. Previously, we would report everything as "never
expires." Fixes bug 14193; bugfix on 0.2.3.17-beta.
- Avoid a small memory leak when we find a cached answer for a
reverse DNS lookup in a client-side DNS cache. (Remember, client-
side DNS caching is off by default, and is not recommended.) Fixes
bug 14259; bugfix on 0.2.0.1-alpha.
o Minor bugfixes (client, automapping):
- Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
no value follows the option. Fixes bug 14142; bugfix on
0.2.4.7-alpha. Patch by "teor".
- Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
14195; bugfix on 0.1.0.1-rc.
- Prevent changes to other options from removing the wildcard value
"." from "AutomapHostsSuffixes". Fixes bug 12509; bugfix
on 0.2.0.1-alpha.
- Allow MapAddress and AutomapHostsOnResolve to work together when
an address is mapped into another address type (like .onion) that
must be automapped at resolve time. Fixes bug 7555; bugfix
on 0.2.0.1-alpha.
o Minor bugfixes (client, bridges):
- When we are using bridges and we had a network connectivity
problem, only retry connecting to our currently configured
bridges, not all bridges we know about and remember using. Fixes
bug 14216; bugfix on 0.2.2.17-alpha.
o Minor bugfixes (client, IPv6):
- Reject socks requests to literal IPv6 addresses when IPv6Traffic
flag is not set; and not because the NoIPv4Traffic flag was set.
Previously we'd looked at the NoIPv4Traffic flag for both types of
literal addresses. Fixes bug 14280; bugfix on 0.2.4.7-alpha.
o Minor bugfixes (compilation):
- The address of an array in the middle of a structure will always
be non-NULL. clang recognises this and complains. Disable the
tautologous and redundant check to silence this warning. Fixes bug
14001; bugfix on 0.2.1.2-alpha.
- Avoid warnings when building with systemd 209 or later. Fixes bug
14072; bugfix on 0.2.6.2-alpha. Patch from "h.venev".
- Compile correctly with (unreleased) OpenSSL 1.1.0 headers.
Addresses ticket 14188.
- Build without warnings with the stock OpenSSL srtp.h header, which
has a duplicate declaration of SSL_get_selected_srtp_profile().
Fixes bug 14220; this is OpenSSL's bug, not ours.
- Do not compile any code related to Tor2Web mode when Tor2Web mode
is not enabled at compile time. Previously, this code was included
in a disabled state. See discussion on ticket 12844.
- Remove the --disable-threads configure option again. It was
accidentally partially reintroduced in 29ac883606d6d. Fixes bug
14819; bugfix on 0.2.6.2-alpha.
o Minor bugfixes (controller):
- Report "down" in response to the "GETINFO entry-guards" command
when relays are down with an unreachable_since value. Previously,
we would report "up". Fixes bug 14184; bugfix on 0.1.2.2-alpha.
- Avoid crashing on a malformed EXTENDCIRCUIT command. Fixes bug
14116; bugfix on 0.2.2.9-alpha.
- Add a code for the END_CIRC_REASON_IP_NOW_REDUNDANT circuit close
reason. Fixes bug 14207; bugfix on 0.2.6.2-alpha.
o Minor bugfixes (directory authority):
- Allow directory authorities to fetch more data from one another if
they find themselves missing lots of votes. Previously, they had
been bumping against the 10 MB queued data limit. Fixes bug 14261;
bugfix on 0.1.2.5-alpha.
- Do not attempt to download extrainfo documents which we will be
unable to validate with a matching server descriptor. Fixes bug
13762; bugfix on 0.2.0.1-alpha.
- Fix a bug that was truncating AUTHDIR_NEWDESC events sent to the
control port. Fixes bug 14953; bugfix on 0.2.0.1-alpha.
- Enlarge the buffer to read bwauth generated files to avoid an
issue when parsing the file in dirserv_read_measured_bandwidths().
Fixes bug 14125; bugfix on 0.2.2.1-alpha.
o Minor bugfixes (file handling):
- Stop failing when key files are zero-length. Instead, generate new
keys, and overwrite the empty key files. Fixes bug 13111; bugfix
on all versions of Tor. Patch by "teor".
- Stop generating a fresh .old RSA onion key file when the .old file
is missing. Fixes part of 13111; bugfix on 0.0.6rc1.
- Avoid overwriting .old key files with empty key files.
- Skip loading zero-length extrainfo store, router store, stats,
state, and key files.
- Avoid crashing when trying to reload a torrc specified as a
relative path with RunAsDaemon turned on. Fixes bug 13397; bugfix
on 0.2.3.11-alpha.
o Minor bugfixes (hidden services):
- Close the introduction circuit when we have no more usable intro
points, instead of waiting for it to time out. This also ensures
that no follow-up HS descriptor fetch is triggered when the
circuit eventually times out. Fixes bug 14224; bugfix on 0.0.6.
- When fetching a hidden service descriptor for a down service that
was recently up, do not keep refetching until we try the same
replica twice in a row. Fixes bug 14219; bugfix on 0.2.0.10-alpha.
- Successfully launch Tor with a nonexistent hidden service
directory. Our fix for bug 13942 didn't catch this case. Fixes bug
14106; bugfix on 0.2.6.2-alpha.
o Minor bugfixes (logging):
- Avoid crashing when there are more log domains than entries in
domain_list. Bugfix on 0.2.3.1-alpha.
- Add a string representation for LD_SCHED. Fixes bug 14740; bugfix
on 0.2.6.1-alpha.
- Don't log messages to stdout twice when starting up. Fixes bug
13993; bugfix on 0.2.6.1-alpha.
o Minor bugfixes (parsing):
- Stop accepting milliseconds (or other junk) at the end of
descriptor publication times. Fixes bug 9286; bugfix on 0.0.2pre25.
- Support two-number and three-number version numbers correctly, in
case we change the Tor versioning system in the future. Fixes bug
13661; bugfix on 0.0.8pre1.
o Minor bugfixes (path counting):
- When deciding whether the consensus lists any exit nodes, count
the number listed in the consensus, not the number we have
descriptors for. Fixes part of bug 14918; bugfix on 0.2.6.2-alpha.
- When deciding whether we have any exit nodes, only examine
ExitNodes when the ExitNodes option is actually set. Fixes part of
bug 14918; bugfix on 0.2.6.2-alpha.
- Get rid of redundant and possibly scary warnings that we are
missing directory information while we bootstrap. Fixes part of
bug 14918; bugfix on 0.2.6.2-alpha.
o Minor bugfixes (portability):
- Fix the ioctl()-based network interface lookup code so that it
will work on systems that have variable-length struct ifreq, for
example Mac OS X.
- Fix scheduler compilation on targets where char is unsigned. Fixes
bug 14764; bugfix on 0.2.6.2-alpha. Reported by Christian Kujau.
o Minor bugfixes (sandbox):
- Allow glibc fatal errors to be sent to stderr before Tor exits.
Previously, glibc would try to write them to /dev/tty, and the
sandbox would trap the call and make Tor exit prematurely. Fixes
bug 14759; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (shutdown):
- When shutting down, always call event_del() on lingering read or
write events before freeing them. Otherwise, we risk double-frees
or read-after-frees in event_base_free(). Fixes bug 12985; bugfix
on 0.1.0.2-rc.
o Minor bugfixes (small memory leaks):
- Avoid leaking memory when using IPv6 virtual address mappings.
Fixes bug 14123; bugfix on 0.2.4.7-alpha. Patch by Tom van
der Woerdt.
o Minor bugfixes (statistics):
- Increase period over which bandwidth observations are aggregated
from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
o Minor bugfixes (systemd support):
- Fix detection and operation of systemd watchdog. Fixes part of bug
14141; bugfix on 0.2.6.2-alpha. Patch from Tomasz Torcz.
- Run correctly under systemd with the RunAsDaemon option set. Fixes
part of bug 14141; bugfix on 0.2.5.7-rc. Patch from Tomasz Torcz.
- Inform the systemd supervisor about more changes in the Tor
process status. Implements part of ticket 14141. Patch from
Tomasz Torcz.
- Cause the "--disable-systemd" option to actually disable systemd
support. Fixes bug 14350; bugfix on 0.2.6.2-alpha. Patch
from "blueness".
o Minor bugfixes (TLS):
- Check more thoroughly throughout the TLS code for possible
unlogged TLS errors. Possible diagnostic or fix for bug 13319.
o Minor bugfixes (transparent proxy):
- Use getsockname, not getsockopt, to retrieve the address for a
TPROXY-redirected connection. Fixes bug 13796; bugfix
on 0.2.5.2-alpha.
o Code simplification and refactoring:
- Move fields related to isolating and configuring client ports into
a shared structure. Previously, they were duplicated across
port_cfg_t, listener_connection_t, and edge_connection_t. Failure
to copy them correctly had been the cause of at least one bug in
the past. Closes ticket 8546.
- Refactor the get_interface_addresses_raw() doom-function into
multiple smaller and simpler subfunctions. Cover the resulting
subfunctions with unit-tests. Fixes a significant portion of
issue 12376.
- Remove workaround in dirserv_thinks_router_is_hs_dir() that was
only for version <= 0.2.2.24 which is now deprecated. Closes
ticket 14202.
- Remove a test for a long-defunct broken version-one
directory server.
o Documentation:
- Adding section on OpenBSD to our TUNING document. Thanks to mmcc
for writing the OpenBSD-specific tips. Resolves ticket 13702.
- Make the tor-resolve documentation match its help string and its
options. Resolves part of ticket 14325.
- Log a more useful error message from tor-resolve when failing to
look up a hidden service address. Resolves part of ticket 14325.
o Downgraded warnings:
- Don't warn when we've attempted to contact a relay using the wrong
ntor onion key. Closes ticket 9635.
o Removed features:
- To avoid confusion with the "ExitRelay" option, "ExitNode" is no
longer silently accepted as an alias for "ExitNodes".
- The --enable-mempool and --enable-buf-freelists options, which
were originally created to work around bad malloc implementations,
no longer exist. They were off-by-default in 0.2.5. Closes
ticket 14848.
o Testing:
- Make the checkdir/perms test complete successfully even if the
global umask is not 022. Fixes bug 14215; bugfix on 0.2.6.2-alpha.
- Test that tor does not fail when key files are zero-length. Check
that tor generates new keys, and overwrites the empty key files.
- Test that tor generates new keys when keys are missing
(existing behavior).
- Test that tor does not overwrite key files that already contain
data (existing behavior). Tests bug 13111. Patch by "teor".
- New "make test-stem" target to run stem integration tests.
Requires that the "STEM_SOURCE_DIR" environment variable be set.
Closes ticket 14107.
- Make the test_cmdline_args.py script work correctly on Windows.
Patch from Gisle Vanem.
- Move the slower unit tests into a new "./src/test/test-slow"
binary that can be run independently of the other tests. Closes
ticket 13243.
- Avoid undefined behavior when sampling huge values from the
Laplace distribution. This made unittests fail on Raspberry Pi.
Bug found by Device. Fixes bug 14090; bugfix on 0.2.6.2-alpha.
Changes in version 0.2.6.2-alpha - 2014-12-31
Tor 0.2.6.2-alpha is the second alpha release in the 0.2.6.x series.
It introduces a major new backend for deciding when to send cells on
channels, which should lead down the road to big performance
increases. It contains security and statistics features for better
work on hidden services, and numerous bugfixes.
This release contains many new unit tests, along with major
performance improvements for running testing networks using Chutney.
Thanks to a series of patches contributed by "teor", testing networks
should now bootstrap in seconds, rather than minutes.
o Major features (relay, infrastructure):
- Complete revision of the code that relays use to decide which cell
to send next. Formerly, we selected the best circuit to write on
each channel, but we didn't select among channels in any
sophisticated way. Now, we choose the best circuits globally from
among those whose channels are ready to deliver traffic.
This patch implements a new inter-cmux comparison API, a global
high/low watermark mechanism and a global scheduler loop for
transmission prioritization across all channels as well as among
circuits on one channel. This schedule is currently tuned to
(tolerantly) avoid making changes in network performance, but it
should form the basis for major circuit performance increases in
the future. Code by Andrea; tuning by Rob Jansen; implements
ticket 9262.
o Major features (hidden services):
- Make HS port scanning more difficult by immediately closing the
circuit when a user attempts to connect to a nonexistent port.
Closes ticket 13667.
- Add a HiddenServiceStatistics option that allows Tor relays to
gather and publish statistics about the overall size and volume of
hidden service usage. Specifically, when this option is turned on,
an HSDir will publish an approximate number of hidden services
that have published descriptors to it the past 24 hours. Also, if
a relay has acted as a hidden service rendezvous point, it will
publish the approximate amount of rendezvous cells it has relayed
the past 24 hours. The statistics themselves are obfuscated so
that the exact values cannot be derived. For more details see
proposal 238, "Better hidden service stats from Tor relays". This
feature is currently disabled by default. Implements feature 13192.
o Major bugfixes (client, automap):
- Repair automapping with IPv6 addresses. This automapping should
have worked previously, but one piece of debugging code that we
inserted to detect a regression actually caused the regression to
manifest itself again. Fixes bug 13811 and bug 12831; bugfix on
0.2.4.7-alpha. Diagnosed and fixed by Francisco Blas
Izquierdo Riera.
o Major bugfixes (hidden services):
- When closing an introduction circuit that was opened in parallel
with others, don't mark the introduction point as unreachable.
Previously, the first successful connection to an introduction
point would make the other introduction points get marked as
having timed out. Fixes bug 13698; bugfix on 0.0.6rc2.
o Directory authority changes:
- Remove turtles as a directory authority.
- Add longclaw as a new (v3) directory authority. This implements
ticket 13296. This keeps the directory authority count at 9.
o Major removed features:
- Tor clients no longer support connecting to hidden services
running on Tor 0.2.2.x and earlier; the Support022HiddenServices
option has been removed. (There shouldn't be any hidden services
running these versions on the network.) Closes ticket 7803.
o Minor features (client):
- Validate hostnames in SOCKS5 requests more strictly. If SafeSocks
is enabled, reject requests with IP addresses as hostnames.
Resolves ticket 13315.
o Minor features (controller):
- Add a "SIGNAL HEARTBEAT" controller command that tells Tor to
write an unscheduled heartbeat message to the log. Implements
feature 9503.
o Minor features (geoip):
- Update geoip and geoip6 to the November 15 2014 Maxmind GeoLite2
Country database.
o Minor features (hidden services):
- When re-enabling the network, don't try to build introduction
circuits until we have successfully built a circuit. This makes
hidden services come up faster when the network is re-enabled.
Patch from "akwizgran". Closes ticket 13447.
- When we fail to retrieve a hidden service descriptor, send the
controller an "HS_DESC FAILED" controller event. Implements
feature 13212.
- New HiddenServiceDirGroupReadable option to cause hidden service
directories and hostname files to be created group-readable. Patch
from "anon", David Stainton, and "meejah". Closes ticket 11291.
o Minor features (systemd):
- Where supported, when running with systemd, report successful
startup to systemd. Part of ticket 11016. Patch by Michael Scherer.
- When running with systemd, support systemd watchdog messages. Part
of ticket 11016. Patch by Michael Scherer.
o Minor features (transparent proxy):
- Update the transparent proxy option checks to allow for both ipfw
and pf on OS X. Closes ticket 14002.
- Use the correct option when using IPv6 with transparent proxy
support on Linux. Resolves 13808. Patch by Francisco Blas
Izquierdo Riera.
o Minor bugfixes (preventative security, C safety):
- When reading a hexadecimal, base-32, or base-64 encoded value from
a string, always overwrite the whole output buffer. This prevents
some bugs where we would look at (but fortunately, not reveal)
uninitialized memory on the stack. Fixes bug 14013; bugfix on all
versions of Tor.
- Clear all memory targeted by tor_addr_{to,from}_sockaddr(), not
just the part that's used. This makes it harder for data leak bugs
to occur in the event of other programming failures. Resolves
ticket 14041.
o Minor bugfixes (client, microdescriptors):
- Use a full 256 bits of the SHA256 digest of a microdescriptor when
computing which microdescriptors to download. This keeps us from
erroneous download behavior if two microdescriptor digests ever
have the same first 160 bits. Fixes part of bug 13399; bugfix
on 0.2.3.1-alpha.
- Reset a router's status if its microdescriptor digest changes,
even if the first 160 bits remain the same. Fixes part of bug
13399; bugfix on 0.2.3.1-alpha.
o Minor bugfixes (compilation):
- Silence clang warnings under --enable-expensive-hardening,
including implicit truncation of 64 bit values to 32 bit, const
char assignment to self, tautological compare, and additional
parentheses around equality tests. Fixes bug 13577; bugfix
on 0.2.5.4-alpha.
- Fix a clang warning about checking whether an address in the
middle of a structure is NULL. Fixes bug 14001; bugfix
on 0.2.1.2-alpha.
o Minor bugfixes (hidden services):
- Correctly send a controller event when we find that a rendezvous
circuit has finished. Fixes bug 13936; bugfix on 0.1.1.5-alpha.
- Pre-check directory permissions for new hidden-services to avoid
at least one case of "Bug: Acting on config options left us in a
broken state. Dying." Fixes bug 13942; bugfix on 0.0.6pre1.
- When adding a new hidden service (for example, via SETCONF), Tor
no longer congratulates the user for running a relay. Fixes bug
13941; bugfix on 0.2.6.1-alpha.
- When fetching hidden service descriptors, we now check not only
for whether we got the hidden service we had in mind, but also
whether we got the particular descriptors we wanted. This prevents
a class of inefficient but annoying DoS attacks by hidden service
directories. Fixes bug 13214; bugfix on 0.2.1.6-alpha. Reported
by "special".
o Minor bugfixes (Linux seccomp2 sandbox):
- Make transparent proxy support work along with the seccomp2
sandbox. Fixes part of bug 13808; bugfix on 0.2.5.1-alpha. Patch
by Francisco Blas Izquierdo Riera.
- Fix a memory leak in tor-resolve when running with the sandbox
enabled. Fixes bug 14050; bugfix on 0.2.5.9-rc.
o Minor bugfixes (logging):
- Downgrade warnings about RSA signature failures to info log level.
Emit a warning when an extra info document is found incompatible
with a corresponding router descriptor. Fixes bug 9812; bugfix
on 0.0.6rc3.
- Make connection_ap_handshake_attach_circuit() log the circuit ID
correctly. Fixes bug 13701; bugfix on 0.0.6.
o Minor bugfixes (misc):
- Stop allowing invalid address patterns like "*/24" that contain
both a wildcard address and a bit prefix length. This affects all
our address-range parsing code. Fixes bug 7484; bugfix
on 0.0.2pre14.
o Minor bugfixes (testing networks, fast startup):
- Allow Tor to build circuits using a consensus with no exits. If
the consensus has no exits (typical of a bootstrapping test
network), allow Tor to build circuits once enough descriptors have
been downloaded. This assists in bootstrapping a testing Tor
network. Fixes bug 13718; bugfix on 0.2.4.10-alpha. Patch
by "teor".
- When V3AuthVotingInterval is low, give a lower If-Modified-Since
header to directory servers. This allows us to obtain consensuses
promptly when the consensus interval is very short. This assists
in bootstrapping a testing Tor network. Fixes parts of bugs 13718
and 13963; bugfix on 0.2.0.3-alpha. Patch by "teor".
- Stop assuming that private addresses are local when checking
reachability in a TestingTorNetwork. Instead, when testing, assume
all OR connections are remote. (This is necessary due to many test
scenarios running all relays on localhost.) This assists in
bootstrapping a testing Tor network. Fixes bug 13924; bugfix on
0.1.0.1-rc. Patch by "teor".
- Avoid building exit circuits from a consensus with no exits. Now
thanks to our fix for 13718, we accept a no-exit network as not
wholly lost, but we need to remember not to try to build exit
circuits on it. Closes ticket 13814; patch by "teor".
- Stop requiring exits to have non-zero bandwithcapacity in a
TestingTorNetwork. Instead, when TestingMinExitFlagThreshold is 0,
ignore exit bandwidthcapacity. This assists in bootstrapping a
testing Tor network. Fixes parts of bugs 13718 and 13839; bugfix
on 0.2.0.3-alpha. Patch by "teor".
- Add "internal" to some bootstrap statuses when no exits are
available. If the consensus does not contain Exits, Tor will only
build internal circuits. In this case, relevant statuses will
contain the word "internal" as indicated in the Tor control-
spec.txt. When bootstrap completes, Tor will be ready to build
internal circuits. If a future consensus contains Exits, exit
circuits may become available. Fixes part of bug 13718; bugfix on
0.2.4.10-alpha. Patch by "teor".
- Decrease minimum consensus interval to 10 seconds when
TestingTorNetwork is set, or 5 seconds for the first consensus.
Fix assumptions throughout the code that assume larger intervals.
Fixes bugs 13718 and 13823; bugfix on 0.2.0.3-alpha. Patch
by "teor".
- Avoid excluding guards from path building in minimal test
networks, when we're in a test network and excluding guards would
exclude all relays. This typically occurs in incredibly small tor
networks, and those using "TestingAuthVoteGuard *". Fixes part of
bug 13718; bugfix on 0.1.1.11-alpha. Patch by "teor".
o Code simplification and refactoring:
- Stop using can_complete_circuits as a global variable; access it
with a function instead.
- Avoid using operators directly as macro arguments: this lets us
apply coccinelle transformations to our codebase more directly.
Closes ticket 13172.
- Combine the functions used to parse ClientTransportPlugin and
ServerTransportPlugin into a single function. Closes ticket 6456.
- Add inline functions and convenience macros for inspecting channel
state. Refactor the code to use convenience macros instead of
checking channel state directly. Fixes issue 7356.
- Document all members of was_router_added_t and rename
ROUTER_WAS_NOT_NEW to ROUTER_IS_ALREADY_KNOWN to make it less
confusable with ROUTER_WAS_TOO_OLD. Fixes issue 13644.
- In connection_exit_begin_conn(), use END_CIRC_REASON_TORPROTOCOL
constant instead of hardcoded value. Fixes issue 13840.
- Refactor our generic strmap and digestmap types into a single
implementation, so that we can add a new digest256map
type trivially.
o Documentation:
- Document the bridge-authority-only 'networkstatus-bridges' file.
Closes ticket 13713; patch from "tom".
- Fix typo in PredictedPortsRelevanceTime option description in
manpage. Resolves issue 13707.
- Stop suggesting that users specify relays by nickname: it isn't a
good idea. Also, properly cross-reference how to specify relays in
all parts of manual documenting options that take a list of
relays. Closes ticket 13381.
- Clarify the HiddenServiceDir option description in manpage to make
it clear that relative paths are taken with respect to the current
working directory. Also clarify that this behavior is not
guaranteed to remain indefinitely. Fixes issue 13913.
o Testing:
- New tests for many parts of channel, relay, and circuitmux
functionality. Code by Andrea; part of 9262.
- New tests for parse_transport_line(). Part of ticket 6456.
- In the unit tests, use chgrp() to change the group of the unit
test temporary directory to the current user, so that the sticky
bit doesn't interfere with tests that check directory groups.
Closes 13678.
- Add unit tests for resolve_my_addr(). Part of ticket 12376; patch
by 'rl1987'.
Changes in version 0.2.6.1-alpha - 2014-10-30
Tor 0.2.6.1-alpha is the first release in the Tor 0.2.6.x series. It
includes numerous code cleanups and new tests, and fixes a large
number of annoying bugs. Out-of-memory conditions are handled better
than in 0.2.5, pluggable transports have improved proxy support, and
clients now use optimistic data for contacting hidden services. Also,
we are now more robust to changes in what we consider a parseable
directory object, so that tightening restrictions does not have a risk
of introducing infinite download loops.
This is the first alpha release in a new series, so expect there to be
bugs. Users who would rather test out a more stable branch should stay
with 0.2.5.x for now.
o New compiler and system requirements:
- Tor 0.2.6.x requires that your compiler support more of the C99
language standard than before. The 'configure' script now detects
whether your compiler supports C99 mid-block declarations and
designated initializers. If it does not, Tor will not compile.
We may revisit this requirement if it turns out that a significant
number of people need to build Tor with compilers that don't
bother implementing a 15-year-old standard. Closes ticket 13233.
- Tor no longer supports systems without threading support. When we
began working on Tor, there were several systems that didn't have
threads, or where the thread support wasn't able to run the
threads of a single process on multiple CPUs. That no longer
holds: every system where Tor needs to run well now has threading
support. Resolves ticket 12439.
o Removed platform support:
- We no longer include special code to build on Windows CE; as far
as we know, nobody has used Tor on Windows CE in a very long time.
Closes ticket 11446.
o Major features (bridges):
- Expose the outgoing upstream HTTP/SOCKS proxy to pluggable
transports if they are configured via the "TOR_PT_PROXY"
environment variable. Implements proposal 232. Resolves
ticket 8402.
o Major features (client performance, hidden services):
- Allow clients to use optimistic data when connecting to a hidden
service, which should remove a round-trip from hidden service
initialization. See proposal 181 for details. Implements
ticket 13211.
o Major features (directory system):
- Upon receiving an unparseable directory object, if its digest
matches what we expected, then don't try to download it again.
Previously, when we got a descriptor we didn't like, we would keep
trying to download it over and over. Closes ticket 11243.
o Major features (sample torrc):
- Add a new, infrequently-changed "torrc.minimal". This file is
similar to torrc.sample, but it will change as infrequently as
possible, for the benefit of users whose systems prompt them for
intervention whenever a default configuration file is changed.
Making this change allows us to update torrc.sample to be a more
generally useful "sample torrc".
o Major bugfixes (directory authorities):
- Do not assign the HSDir flag to relays if they are not Valid, or
currently hibernating. Fixes 12573; bugfix on 0.2.0.10-alpha.
o Major bugfixes (directory bandwidth performance):
- Don't flush the zlib buffer aggressively when compressing
directory information for clients. This should save about 7% of
the bandwidth currently used for compressed descriptors and
microdescriptors. Fixes bug 11787; bugfix on 0.1.1.23.
o Minor features (security, memory wiping):
- Ensure we securely wipe keys from memory after
crypto_digest_get_digest and init_curve25519_keypair_from_file
have finished using them. Resolves ticket 13477.
o Minor features (security, out-of-memory handling):
- When handling an out-of-memory condition, allocate less memory for
temporary data structures. Fixes issue 10115.
- When handling an out-of-memory condition, consider more types of
buffers, including those on directory connections, and zlib
buffers. Resolves ticket 11792.
o Minor features:
- When identity keypair is generated for first time, log a
congratulatory message that links to the new relay lifecycle
document. Implements feature 10427.
o Minor features (client):
- Clients are now willing to send optimistic data (before they
receive a 'connected' cell) to relays of any version. (Relays
without support for optimistic data are no longer supported on the
Tor network.) Resolves ticket 13153.
o Minor features (directory authorities):
- Don't list relays with a bandwidth estimate of 0 in the consensus.
Implements a feature proposed during discussion of bug 13000.
- In tor-gencert, report an error if the user provides the same
argument more than once.
- If a directory authority can't find a best consensus method in the
votes that it holds, it now falls back to its favorite consensus
method. Previously, it fell back to method 1. Neither of these is
likely to get enough signatures, but "fall back to favorite"
doesn't require us to maintain support an obsolete consensus
method. Implements part of proposal 215.
o Minor features (logging):
- On Unix-like systems, you can now use named pipes as the target of
the Log option, and other options that try to append to files.
Closes ticket 12061. Patch from "carlo von lynX".
- When opening a log file at startup, send it every log message that
we generated between startup and opening it. Previously, log
messages that were generated before opening the log file were only
logged to stdout. Closes ticket 6938.
- Add a TruncateLogFile option to overwrite logs instead of
appending to them. Closes ticket 5583.
o Minor features (portability, Solaris):
- Threads are no longer disabled by default on Solaris; we believe
that the versions of Solaris with broken threading support are all
obsolete by now. Resolves ticket 9495.
o Minor features (relay):
- Re-check our address after we detect a changed IP address from
getsockname(). This ensures that the controller command "GETINFO
address" will report the correct value. Resolves ticket 11582.
Patch from "ra".
- A new AccountingRule option lets Relays set whether they'd like
AccountingMax to be applied separately to inbound and outbound
traffic, or applied to the sum of inbound and outbound traffic.
Resolves ticket 961. Patch by "chobe".
o Minor features (testing networks):
- Add the TestingDirAuthVoteExit option, which lists nodes to assign
the "Exit" flag regardless of their uptime, bandwidth, or exit
policy. TestingTorNetwork must be set for this option to have any
effect. Previously, authorities would take up to 35 minutes to
give nodes the Exit flag in a test network. Partially implements
ticket 13161.
o Minor features (validation):
- Check all date/time values passed to tor_timegm and
parse_rfc1123_time for validity, taking leap years into account.
Improves HTTP header validation. Implemented with bug 13476.
- In correct_tm(), limit the range of values returned by system
localtime(_r) and gmtime(_r) to be between the years 1 and 8099.
This means we don't have to deal with negative or too large dates,
even if a clock is wrong. Otherwise we might fail to read a file
written by us which includes such a date. Fixes bug 13476.
o Minor bugfixes (bridge clients):
- When configured to use a bridge without an identity digest (not
recommended), avoid launching an extra channel to it when
bootstrapping. Fixes bug 7733; bugfix on 0.2.4.4-alpha.
o Minor bugfixes (bridges):
- When DisableNetwork is set, do not launch pluggable transport
plugins, and if any are running, terminate them. Fixes bug 13213;
bugfix on 0.2.3.6-alpha.
o Minor bugfixes (C correctness):
- Fix several instances of possible integer overflow/underflow/NaN.
Fixes bug 13104; bugfix on 0.2.3.1-alpha and later. Patches
from "teor".
- In circuit_build_times_calculate_timeout() in circuitstats.c,
avoid dividing by zero in the pareto calculations. This traps
under clang's "undefined-trap" sanitizer. Fixes bug 13290; bugfix
on 0.2.2.2-alpha.
- Fix an integer overflow in format_time_interval(). Fixes bug
13393; bugfix on 0.2.0.10-alpha.
- Set the correct day of year value when the system's localtime(_r)
or gmtime(_r) functions fail to set struct tm. Not externally
visible. Fixes bug 13476; bugfix on 0.0.2pre14.
- Avoid unlikely signed integer overflow in tor_timegm on systems
with 32-bit time_t. Fixes bug 13476; bugfix on 0.0.2pre14.
o Minor bugfixes (client):
- Fix smartlist_choose_node_by_bandwidth() so that relays with the
BadExit flag are not considered worthy candidates. Fixes bug
13066; bugfix on 0.1.2.3-alpha.
- Use the consensus schedule for downloading consensuses, and not
the generic schedule. Fixes bug 11679; bugfix on 0.2.2.6-alpha.
- Handle unsupported or malformed SOCKS5 requests properly by
responding with the appropriate error message before closing the
connection. Fixes bugs 12971 and 13314; bugfix on 0.0.2pre13.
o Minor bugfixes (client, torrc):
- Stop modifying the value of our DirReqStatistics torrc option just
because we're not a bridge or relay. This bug was causing Tor
Browser users to write "DirReqStatistics 0" in their torrc files
as if they had chosen to change the config. Fixes bug 4244; bugfix
on 0.2.3.1-alpha.
- When GeoIPExcludeUnknown is enabled, do not incorrectly decide
that our options have changed every time we SIGHUP. Fixes bug
9801; bugfix on 0.2.4.10-alpha. Patch from "qwerty1".
o Minor bugfixes (controller):
- Return an error when the second or later arguments of the
"setevents" controller command are invalid events. Previously we
would return success while silently skipping invalid events. Fixes
bug 13205; bugfix on 0.2.3.2-alpha. Reported by "fpxnns".
o Minor bugfixes (directory system):
- Always believe that v3 directory authorities serve extra-info
documents, whether they advertise "caches-extra-info" or not.
Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
- When running as a v3 directory authority, advertise that you serve
extra-info documents so that clients who want them can find them
from you too. Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
- Check the BRIDGE_DIRINFO flag bitwise rather than using equality.
Previously, directories offering BRIDGE_DIRINFO and some other
flag (i.e. microdescriptors or extrainfo) would be ignored when
looking for bridges. Partially fixes bug 13163; bugfix
on 0.2.0.7-alpha.
o Minor bugfixes (networking):
- Check for orconns and use connection_or_close_for_error() rather
than connection_mark_for_close() directly in the getsockopt()
failure case of connection_handle_write_impl(). Fixes bug 11302;
bugfix on 0.2.4.4-alpha.
o Minor bugfixes (relay):
- When generating our family list, remove spaces from around the
entries. Fixes bug 12728; bugfix on 0.2.1.7-alpha.
- If our previous bandwidth estimate was 0 bytes, allow publishing a
new relay descriptor immediately. Fixes bug 13000; bugfix
on 0.1.1.6-alpha.
o Minor bugfixes (testing networks):
- Fix TestingDirAuthVoteGuard to properly give out Guard flags in a
testing network. Fixes bug 13064; bugfix on 0.2.5.2-alpha.
- Stop using the default authorities in networks which provide both
AlternateDirAuthority and AlternateBridgeAuthority. Partially
fixes bug 13163; bugfix on 0.2.0.13-alpha.
o Minor bugfixes (testing):
- Stop spawn test failures due to a race condition between the
SIGCHLD handler updating the process status, and the test reading
it. Fixes bug 13291; bugfix on 0.2.3.3-alpha.
o Minor bugfixes (testing, Windows):
- Avoid passing an extra backslash when creating a temporary
directory for running the unit tests on Windows. Fixes bug 12392;
bugfix on 0.2.2.25-alpha. Patch from Gisle Vanem.
o Minor bugfixes (windows):
- Remove code to special-case handling of NTE_BAD_KEYSET when
acquiring windows CryptoAPI context. This error can't actually
occur for the parameters we're providing. Fixes bug 10816; bugfix
on 0.0.2pre26.
o Minor bugfixes (zlib):
- Avoid truncating a zlib stream when trying to finalize it with an
empty output buffer. Fixes bug 11824; bugfix on 0.1.1.23.
o Build fixes:
- Allow our configure script to build correctly with autoconf 2.62
again. Fixes bug 12693; bugfix on 0.2.5.2-alpha.
- Improve the error message from ./configure to make it clear that
when asciidoc has not been found, the user will have to either add
--disable-asciidoc argument or install asciidoc. Resolves
ticket 13228.
o Code simplification and refactoring:
- Change the entry_is_live() function to take named bitfield
elements instead of an unnamed list of booleans. Closes
ticket 12202.
- Refactor and unit-test entry_is_time_to_retry() in entrynodes.c.
Resolves ticket 12205.
- Use calloc and reallocarray functions instead of multiply-
then-malloc. This makes it less likely for us to fall victim to an
integer overflow attack when allocating. Resolves ticket 12855.
- Use the standard macro name SIZE_MAX, instead of our
own SIZE_T_MAX.
- Document usage of the NO_DIRINFO and ALL_DIRINFO flags clearly in
functions which take them as arguments. Replace 0 with NO_DIRINFO
in a function call for clarity. Seeks to prevent future issues
like 13163.
- Avoid 4 null pointer errors under clang static analysis by using
tor_assert() to prove that the pointers aren't null. Fixes
bug 13284.
- Rework the API of policies_parse_exit_policy() to use a bitmask to
represent parsing options, instead of a confusing mess of
booleans. Resolves ticket 8197.
- Introduce a helper function to parse ExitPolicy in
or_options_t structure.
o Documentation:
- Add a doc/TUNING document with tips for handling large numbers of
TCP connections when running busy Tor relay. Update the warning
message to point to this file when running out of sockets
operating system is allowing to use simultaneously. Resolves
ticket 9708.
o Removed features:
- We no longer remind the user about configuration options that have
been obsolete since 0.2.3.x or earlier. Patch by Adrien Bak.
- Remove our old, non-weighted bandwidth-based node selection code.
Previously, we used it as a fallback when we couldn't perform
weighted bandwidth-based node selection. But that would only
happen in the cases where we had no consensus, or when we had a
consensus generated by buggy or ancient directory authorities. In
either case, it's better to use the more modern, better maintained
algorithm, with reasonable defaults for the weights. Closes
ticket 13126.
- Remove the --disable-curve25519 configure option. Relays and
clients now are required to support curve25519 and the
ntor handshake.
- The old "StrictEntryNodes" and "StrictExitNodes" options, which
used to be deprecated synonyms for "StrictNodes", are now marked
obsolete. Resolves ticket 12226.
- Clients don't understand the BadDirectory flag in the consensus
anymore, and ignore it.
o Testing:
- Refactor the function that chooses guard nodes so that it can more
easily be tested; write some tests for it.
- Fix and re-enable the fgets_eagain unit test. Fixes bug 12503;
bugfix on 0.2.3.1-alpha. Patch from "cypherpunks."
- Create unit tests for format_time_interval(). With bug 13393.
- Add unit tests for tor_timegm signed overflow, tor_timegm and
parse_rfc1123_time validity checks, correct_tm year clamping. Unit
tests (visible) fixes in bug 13476.
- Add a "coverage-html" make target to generate HTML-visualized
coverage results when building with --enable-coverage. (Requires
lcov.) Patch from Kevin Murray.
- Enable the backtrace handler (where supported) when running the
unit tests.
- Revise all unit tests that used the legacy test_* macros to
instead use the recommended tt_* macros. This patch was generated
with coccinelle, to avoid manual errors. Closes ticket 13119.
o Distribution (systemd):
- systemd unit file: only allow tor to write to /var/lib/tor and
/var/log/tor. The rest of the filesystem is accessible for reading
only. Patch by intrigeri; resolves ticket 12751.
- systemd unit file: ensure that the process and all its children
can never gain new privileges. Patch by intrigeri; resolves
ticket 12939.
- systemd unit file: set up /var/run/tor as writable for the Tor
service. Patch by intrigeri; resolves ticket 13196.
o Removed features (directory authorities):
- Remove code that prevented authorities from listing Tor relays
affected by CVE-2011-2769 as guards. These relays are already
rejected altogether due to the minimum version requirement of
0.2.3.16-alpha. Closes ticket 13152.
- The "AuthDirRejectUnlisted" option no longer has any effect, as
the fingerprints file (approved-routers) has been deprecated.
- Directory authorities do not support being Naming dirauths anymore.
The "NamingAuthoritativeDir" config option is now obsolete.
- Directory authorities do not support giving out the BadDirectory
flag anymore.
- Directory authorities no longer advertise or support consensus
methods 1 through 12 inclusive. These consensus methods were
obsolete and/or insecure: maintaining the ability to support them
served no good purpose. Implements part of proposal 215; closes
ticket 10163.
o Testing (test-network.sh):
- Stop using "echo -n", as some shells' built-in echo doesn't
support "-n". Instead, use "/bin/echo -n". Partially fixes
bug 13161.
- Stop an apparent test-network hang when used with make -j2. Fixes
bug 13331.
- Add a --delay option to test-network.sh, which configures the
delay before the chutney network tests for data transmission.
Partially implements ticket 13161.
Changes in version 0.2.5.10 - 2014-10-24
Tor 0.2.5.10 is the first stable release in the 0.2.5 series.
It adds several new security features, including improved
denial-of-service resistance for relays, new compiler hardening
options, and a system-call sandbox for hardened installations on Linux
(requires seccomp2). The controller protocol has several new features,
resolving IPv6 addresses should work better than before, and relays
should be a little more CPU-efficient. We've added support for more
OpenBSD and FreeBSD transparent proxy types. We've improved the build
system and testing infrastructure to allow unit testing of more parts
of the Tor codebase. Finally, we've addressed several nagging pluggable
transport usability issues, and included numerous other small bugfixes
and features mentioned below.
This release marks end-of-life for Tor 0.2.3.x; those Tor versions
have accumulated many known flaws; everyone should upgrade.
o Deprecated versions:
- Tor 0.2.3.x has reached end-of-life; it has received no patches or
attention for some while.
Changes in version 0.2.5.9-rc - 2014-10-20
Tor 0.2.5.9-rc is the third release candidate for the Tor 0.2.5.x
series. It disables SSL3 in response to the recent "POODLE" attack
(even though POODLE does not affect Tor). It also works around a crash
bug caused by some operating systems' response to the "POODLE" attack
(which does affect Tor). It also contains a few miscellaneous fixes.
o Major security fixes:
- Disable support for SSLv3. All versions of OpenSSL in use with Tor
today support TLS 1.0 or later, so we can safely turn off support
for this old (and insecure) protocol. Fixes bug 13426.
o Major bugfixes (openssl bug workaround):
- Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
1.0.1j, built with the 'no-ssl3' configuration option. Fixes bug
13471. This is a workaround for an OpenSSL bug.
o Minor bugfixes:
- Disable the sandbox name resolver cache when running tor-resolve:
tor-resolve doesn't use the sandbox code, and turning it on was
breaking attempts to do tor-resolve on a non-default server on
Linux. Fixes bug 13295; bugfix on 0.2.5.3-alpha.
o Compilation fixes:
- Build and run correctly on systems like OpenBSD-current that have
patched OpenSSL to remove get_cipher_by_char and/or its
implementations. Fixes issue 13325.
o Downgraded warnings:
- Downgrade the severity of the 'unexpected sendme cell from client'
from 'warn' to 'protocol warning'. Closes ticket 8093.
Changes in version 0.2.4.25 - 2014-10-20
Tor 0.2.4.25 disables SSL3 in response to the recent "POODLE" attack
(even though POODLE does not affect Tor). It also works around a crash
bug caused by some operating systems' response to the "POODLE" attack
(which does affect Tor).
o Major security fixes (also in 0.2.5.9-rc):
- Disable support for SSLv3. All versions of OpenSSL in use with Tor
today support TLS 1.0 or later, so we can safely turn off support
for this old (and insecure) protocol. Fixes bug 13426.
o Major bugfixes (openssl bug workaround, also in 0.2.5.9-rc):
- Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
1.0.1j, built with the 'no-ssl3' configuration option. Fixes bug
13471. This is a workaround for an OpenSSL bug.
Changes in version 0.2.5.8-rc - 2014-09-22
Tor 0.2.5.8-rc is the second release candidate for the Tor 0.2.5.x
series. It fixes a bug that affects consistency and speed when
connecting to hidden services, and it updates the location of one of
the directory authorities.
o Major bugfixes:
- Clients now send the correct address for their chosen rendezvous
point when trying to access a hidden service. They used to send
the wrong address, which would still work some of the time because
they also sent the identity digest of the rendezvous point, and if
the hidden service happened to try connecting to the rendezvous
point from a relay that already had a connection open to it,
the relay would reuse that connection. Now connections to hidden
services should be more robust and faster. Also, this bug meant
that clients were leaking to the hidden service whether they were
on a little-endian (common) or big-endian (rare) system, which for
some users might have reduced their anonymity. Fixes bug 13151;
bugfix on 0.2.1.5-alpha.
o Directory authority changes:
- Change IP address for gabelmoo (v3 directory authority).
Changes in version 0.2.4.24 - 2014-09-22
Tor 0.2.4.24 fixes a bug that affects consistency and speed when
connecting to hidden services, and it updates the location of one of
the directory authorities.
o Major bugfixes:
- Clients now send the correct address for their chosen rendezvous
point when trying to access a hidden service. They used to send
the wrong address, which would still work some of the time because
they also sent the identity digest of the rendezvous point, and if
the hidden service happened to try connecting to the rendezvous
point from a relay that already had a connection open to it,
the relay would reuse that connection. Now connections to hidden
services should be more robust and faster. Also, this bug meant
that clients were leaking to the hidden service whether they were
on a little-endian (common) or big-endian (rare) system, which for
some users might have reduced their anonymity. Fixes bug 13151;
bugfix on 0.2.1.5-alpha.
o Directory authority changes:
- Change IP address for gabelmoo (v3 directory authority).
o Minor features (geoip):
- Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
Country database.
Changes in version 0.2.5.7-rc - 2014-09-11
Tor 0.2.5.7-rc fixes several regressions from earlier in the 0.2.5.x
release series, and some long-standing bugs related to ORPort reachability
testing and failure to send CREATE cells. It is the first release
candidate for the Tor 0.2.5.x series.
o Major bugfixes (client, startup):
- Start making circuits as soon as DisabledNetwork is turned off.
When Tor started with DisabledNetwork set, it would correctly
conclude that it shouldn't build circuits, but it would mistakenly
cache this conclusion, and continue believing it even when
DisableNetwork is set to 0. Fixes the bug introduced by the fix
for bug 11200; bugfix on 0.2.5.4-alpha.
- Resume expanding abbreviations for command-line options. The fix
for bug 4647 accidentally removed our hack from bug 586 that
rewrote HashedControlPassword to __HashedControlSessionPassword
when it appears on the commandline (which allowed the user to set
her own HashedControlPassword in the torrc file while the
controller generates a fresh session password for each run). Fixes
bug 12948; bugfix on 0.2.5.1-alpha.
- Warn about attempts to run hidden services and relays in the same
process: that's probably not a good idea. Closes ticket 12908.
o Major bugfixes (relay):
- Avoid queuing or sending destroy cells for circuit ID zero when we
fail to send a CREATE cell. Fixes bug 12848; bugfix on 0.0.8pre1.
Found and fixed by "cypherpunks".
- Fix ORPort reachability detection on relays running behind a
proxy, by correctly updating the "local" mark on the controlling
channel when changing the address of an or_connection_t after the
handshake. Fixes bug 12160; bugfix on 0.2.4.4-alpha.
o Minor features (bridge):
- Add an ExtORPortCookieAuthFileGroupReadable option to make the
cookie file for the ExtORPort g+r by default.
o Minor features (geoip):
- Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
Country database.
o Minor bugfixes (logging):
- Reduce the log severity of the "Pluggable transport proxy does not
provide any needed transports and will not be launched." message,
since Tor Browser includes several ClientTransportPlugin lines in
its torrc-defaults file, leading every Tor Browser user who looks
at her logs to see these notices and wonder if they're dangerous.
Resolves bug 13124; bugfix on 0.2.5.3-alpha.
- Downgrade "Unexpected onionskin length after decryption" warning
to a protocol-warn, since there's nothing relay operators can do
about a client that sends them a malformed create cell. Resolves
bug 12996; bugfix on 0.0.6rc1.
- Log more specific warnings when we get an ESTABLISH_RENDEZVOUS
cell on a cannibalized or non-OR circuit. Resolves ticket 12997.
- When logging information about an EXTEND2 or EXTENDED2 cell, log
their names correctly. Fixes part of bug 12700; bugfix
on 0.2.4.8-alpha.
- When logging information about a relay cell whose command we don't
recognize, log its command as an integer. Fixes part of bug 12700;
bugfix on 0.2.1.10-alpha.
- Escape all strings from the directory connection before logging
them. Fixes bug 13071; bugfix on 0.1.1.15. Patch from "teor".
o Minor bugfixes (controller):
- Restore the functionality of CookieAuthFileGroupReadable. Fixes
bug 12864; bugfix on 0.2.5.1-alpha.
- Actually send TRANSPORT_LAUNCHED and HS_DESC events to
controllers. Fixes bug 13085; bugfix on 0.2.5.1-alpha. Patch
by "teor".
o Minor bugfixes (compilation):
- Fix compilation of test.h with MSVC. Patch from Gisle Vanem;
bugfix on 0.2.5.5-alpha.
- Make the nmake make files work again. Fixes bug 13081. Bugfix on
0.2.5.1-alpha. Patch from "NewEraCracker".
- In routerlist_assert_ok(), don't take the address of a
routerinfo's cache_info member unless that routerinfo is non-NULL.
Fixes bug 13096; bugfix on 0.1.1.9-alpha. Patch by "teor".
- Fix a large number of false positive warnings from the clang
analyzer static analysis tool. This should make real warnings
easier for clang analyzer to find. Patch from "teor". Closes
ticket 13036.
o Distribution (systemd):
- Verify configuration file via ExecStartPre in the systemd unit
file. Patch from intrigeri; resolves ticket 12730.
- Explicitly disable RunAsDaemon in the systemd unit file. Our
current systemd unit uses "Type = simple", so systemd does not
expect tor to fork. If the user has "RunAsDaemon 1" in their
torrc, then things won't work as expected. This is e.g. the case
on Debian (and derivatives), since there we pass "--defaults-torrc
/usr/share/tor/tor-service-defaults-torrc" (that contains
"RunAsDaemon 1") by default. Patch by intrigeri; resolves
ticket 12731.
o Documentation:
- Adjust the URLs in the README to refer to the new locations of
several documents on the website. Fixes bug 12830. Patch from
Matt Pagan.
- Document 'reject6' and 'accept6' ExitPolicy entries. Resolves
ticket 12878.
Changes in version 0.2.5.6-alpha - 2014-07-28
Tor 0.2.5.6-alpha brings us a big step closer to slowing down the
risk from guard rotation, and fixes a variety of other issues to get
us closer to a release candidate.
o Major features (also in 0.2.4.23):
- Make the number of entry guards configurable via a new
NumEntryGuards consensus parameter, and the number of directory
guards configurable via a new NumDirectoryGuards consensus
parameter. Implements ticket 12688.
o Major bugfixes (also in 0.2.4.23):
- Fix a bug in the bounds-checking in the 32-bit curve25519-donna
implementation that caused incorrect results on 32-bit
implementations when certain malformed inputs were used along with
a small class of private ntor keys. This bug does not currently
appear to allow an attacker to learn private keys or impersonate a
Tor server, but it could provide a means to distinguish 32-bit Tor
implementations from 64-bit Tor implementations. Fixes bug 12694;
bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
Adam Langley.
o Major bugfixes:
- Perform circuit cleanup operations even when circuit
construction operations are disabled (because the network is
disabled, or because there isn't enough directory information).
Previously, when we were not building predictive circuits, we
were not closing expired circuits either. Fixes bug 8387; bugfix on
0.1.1.11-alpha. This bug became visible in 0.2.4.10-alpha when we
became more strict about when we have "enough directory information
to build circuits".
o Minor features:
- Authorities now assign the Guard flag to the fastest 25% of the
network (it used to be the fastest 50%). Also raise the consensus
weight that guarantees the Guard flag from 250 to 2000. For the
current network, this results in about 1100 guards, down from 2500.
This step paves the way for moving the number of entry guards
down to 1 (proposal 236) while still providing reasonable expected
performance for most users. Implements ticket 12690.
- Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
Country database.
- Slightly enhance the diagnostic message for bug 12184.
o Minor bugfixes (also in 0.2.4.23):
- Warn and drop the circuit if we receive an inbound 'relay early'
cell. Those used to be normal to receive on hidden service circuits
due to bug 1038, but the buggy Tor versions are long gone from
the network so we can afford to resume watching for them. Resolves
the rest of bug 1038; bugfix on 0.2.1.19.
- Correct a confusing error message when trying to extend a circuit
via the control protocol but we don't know a descriptor or
microdescriptor for one of the specified relays. Fixes bug 12718;
bugfix on 0.2.3.1-alpha.
o Minor bugfixes:
- Fix compilation when building with bufferevents enabled. (This
configuration is still not expected to work, however.)
Fixes bugs 12438, 12474, 11578; bugfixes on 0.2.5.1-alpha and
0.2.5.3-alpha. Patches from Anthony G. Basile and Sathyanarayanan
Gunasekaran.
- Compile correctly with builds and forks of OpenSSL (such as
LibreSSL) that disable compression. Fixes bug 12602; bugfix on
0.2.1.1-alpha. Patch from "dhill".
Changes in version 0.2.4.23 - 2014-07-28
Tor 0.2.4.23 brings us a big step closer to slowing down the risk from
guard rotation, and also backports several important fixes from the
Tor 0.2.5 alpha release series.
o Major features:
- Clients now look at the "usecreatefast" consensus parameter to
decide whether to use CREATE_FAST or CREATE cells for the first hop
of their circuit. This approach can improve security on connections
where Tor's circuit handshake is stronger than the available TLS
connection security levels, but the tradeoff is more computational
load on guard relays. Implements proposal 221. Resolves ticket 9386.
- Make the number of entry guards configurable via a new
NumEntryGuards consensus parameter, and the number of directory
guards configurable via a new NumDirectoryGuards consensus
parameter. Implements ticket 12688.
o Major bugfixes:
- Fix a bug in the bounds-checking in the 32-bit curve25519-donna
implementation that caused incorrect results on 32-bit
implementations when certain malformed inputs were used along with
a small class of private ntor keys. This bug does not currently
appear to allow an attacker to learn private keys or impersonate a
Tor server, but it could provide a means to distinguish 32-bit Tor
implementations from 64-bit Tor implementations. Fixes bug 12694;
bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
Adam Langley.
o Minor bugfixes:
- Warn and drop the circuit if we receive an inbound 'relay early'
cell. Those used to be normal to receive on hidden service circuits
due to bug 1038, but the buggy Tor versions are long gone from
the network so we can afford to resume watching for them. Resolves
the rest of bug 1038; bugfix on 0.2.1.19.
- Correct a confusing error message when trying to extend a circuit
via the control protocol but we don't know a descriptor or
microdescriptor for one of the specified relays. Fixes bug 12718;
bugfix on 0.2.3.1-alpha.
- Avoid an illegal read from stack when initializing the TLS
module using a version of OpenSSL without all of the ciphers
used by the v2 link handshake. Fixes bug 12227; bugfix on
0.2.4.8-alpha. Found by "starlight".
o Minor features:
- Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
Country database.
Changes in version 0.2.5.5-alpha - 2014-06-18
Tor 0.2.5.5-alpha fixes a wide variety of remaining issues in the Tor
0.2.5.x release series, including a couple of DoS issues, some
performance regressions, a large number of bugs affecting the Linux
seccomp2 sandbox code, and various other bugfixes. It also adds
diagnostic bugfixes for a few tricky issues that we're trying to
track down.
o Major features (security, traffic analysis resistance):
- Several major improvements to the algorithm used to decide when to
close TLS connections. Previous versions of Tor closed connections
at a fixed interval after the last time a non-padding cell was
sent over the connection, regardless of the target of the
connection. Now, we randomize the intervals by adding up to 50% of
their base value, we measure the length of time since connection
last had at least one circuit, and we allow connections to known
ORs to remain open a little longer (15 minutes instead of 3
minutes minimum). These changes should improve Tor's resistance
against some kinds of traffic analysis, and lower some overhead
from needlessly closed connections. Fixes ticket 6799.
Incidentally fixes ticket 12023; bugfix on 0.2.5.1-alpha.
o Major bugfixes (security, OOM, new since 0.2.5.4-alpha, also in 0.2.4.22):
- Fix a memory leak that could occur if a microdescriptor parse
fails during the tokenizing step. This bug could enable a memory
exhaustion attack by directory servers. Fixes bug 11649; bugfix
on 0.2.2.6-alpha.
o Major bugfixes (security, directory authorities):
- Directory authorities now include a digest of each relay's
identity key as a part of its microdescriptor.
This is a workaround for bug 11743 (reported by "cypherpunks"),
where Tor clients do not support receiving multiple
microdescriptors with the same SHA256 digest in the same
consensus. When clients receive a consensus like this, they only
use one of the relays. Without this fix, a hostile relay could
selectively disable some client use of target relays by
constructing a router descriptor with a different identity and the
same microdescriptor parameters and getting the authorities to
list it in a microdescriptor consensus. This fix prevents an
attacker from causing a microdescriptor collision, because the
router's identity is not forgeable.
o Major bugfixes (relay):
- Use a direct dirport connection when uploading non-anonymous
descriptors to the directory authorities. Previously, relays would
incorrectly use tunnel connections under a fairly wide variety of
circumstances. Fixes bug 11469; bugfix on 0.2.4.3-alpha.
- When a circuit accidentally has the same circuit ID for its
forward and reverse direction, correctly detect the direction of
cells using that circuit. Previously, this bug made roughly one
circuit in a million non-functional. Fixes bug 12195; this is a
bugfix on every version of Tor.
o Major bugfixes (client, pluggable transports):
- When managing pluggable transports, use OS notification facilities
to learn if they have crashed, and don't attempt to kill any
process that has already exited. Fixes bug 8746; bugfix
on 0.2.3.6-alpha.
o Minor features (diagnostic):
- When logging a warning because of bug 7164, additionally check the
hash table for consistency (as proposed on ticket 11737). This may
help diagnose bug 7164.
- When we log a heartbeat, log how many one-hop circuits we have
that are at least 30 minutes old, and log status information about
a few of them. This is an attempt to track down bug 8387.
- When encountering an unexpected CR while writing text to a file on
Windows, log the name of the file. Should help diagnosing
bug 11233.
- Give more specific warnings when a client notices that an onion
handshake has failed. Fixes ticket 9635.
- Add significant new logging code to attempt to diagnose bug 12184,
where relays seem to run out of available circuit IDs.
- Improve the diagnostic log message for bug 8387 even further to
try to improve our odds of figuring out why one-hop directory
circuits sometimes do not get closed.
o Minor features (security, memory management):
- Memory allocation tricks (mempools and buffer freelists) are now
disabled by default. You can turn them back on with
--enable-mempools and --enable-buf-freelists respectively. We're
disabling these features because malloc performance is good enough
on most platforms, and a similar feature in OpenSSL exacerbated
exploitation of the Heartbleed attack. Resolves ticket 11476.
o Minor features (security):
- Apply the secure SipHash-2-4 function to the hash table mapping
circuit IDs and channels to circuits. We missed this one when we
were converting all the other hash functions to use SipHash back
in 0.2.5.3-alpha. Resolves ticket 11750.
o Minor features (build):
- The configure script has a --disable-seccomp option to turn off
support for libseccomp on systems that have it, in case it (or
Tor's use of it) is broken. Resolves ticket 11628.
o Minor features (other):
- Update geoip and geoip6 to the June 4 2014 Maxmind GeoLite2
Country database.
o Minor bugfixes (security, new since 0.2.5.4-alpha, also in 0.2.4.22):
- When running a hidden service, do not allow TunneledDirConns 0;
this will keep the hidden service from running, and also
make it publish its descriptors directly over HTTP. Fixes bug 10849;
bugfix on 0.2.1.1-alpha.
o Minor bugfixes (performance):
- Avoid a bug where every successful connection made us recompute
the flag telling us whether we have sufficient information to
build circuits. Previously, we would forget our cached value
whenever we successfully opened a channel (or marked a router as
running or not running for any other reason), regardless of
whether we had previously believed the router to be running. This
forced us to run an expensive update operation far too often.
Fixes bug 12170; bugfix on 0.1.2.1-alpha.
- Avoid using tor_memeq() for checking relay cell integrity. This
removes a possible performance bottleneck. Fixes part of bug
12169; bugfix on 0.2.1.31.
o Minor bugfixes (compilation):
- Fix compilation of test_status.c when building with MVSC. Bugfix
on 0.2.5.4-alpha. Patch from Gisle Vanem.
- Resolve GCC complaints on OpenBSD about discarding constness in
TO_{ORIGIN,OR}_CIRCUIT functions. Fixes part of bug 11633; bugfix
on 0.1.1.23. Patch from Dana Koch.
- Resolve clang complaints on OpenBSD with -Wshorten-64-to-32 due to
treatment of long and time_t as comparable types. Fixes part of
bug 11633. Patch from Dana Koch.
- Make Tor compile correctly with --disable-buf-freelists. Fixes bug
11623; bugfix on 0.2.5.3-alpha.
- When deciding whether to build the 64-bit curve25519
implementation, detect platforms where we can compile 128-bit
arithmetic but cannot link it. Fixes bug 11729; bugfix on
0.2.4.8-alpha. Patch from "conradev".
- Fix compilation when DNS_CACHE_DEBUG is enabled. Fixes bug 11761;
bugfix on 0.2.3.13-alpha. Found by "cypherpunks".
- Fix compilation with dmalloc. Fixes bug 11605; bugfix
on 0.2.4.10-alpha.
o Minor bugfixes (Directory server):
- When sending a compressed set of descriptors or microdescriptors,
make sure to finalize the zlib stream. Previously, we would write
all the compressed data, but if the last descriptor we wanted to
send was missing or too old, we would not mark the stream as
finished. This caused problems for decompression tools. Fixes bug
11648; bugfix on 0.1.1.23.
o Minor bugfixes (Linux seccomp sandbox):
- Make the seccomp sandbox code compile under ARM Linux. Fixes bug
11622; bugfix on 0.2.5.1-alpha.
- Avoid crashing when re-opening listener ports with the seccomp
sandbox active. Fixes bug 12115; bugfix on 0.2.5.1-alpha.
- Avoid crashing with the seccomp sandbox enabled along with
ConstrainedSockets. Fixes bug 12139; bugfix on 0.2.5.1-alpha.
- When we receive a SIGHUP with the sandbox enabled, correctly
support rotating our log files. Fixes bug 12032; bugfix
on 0.2.5.1-alpha.
- Avoid crash when running with sandboxing enabled and
DirReqStatistics not disabled. Fixes bug 12035; bugfix
on 0.2.5.1-alpha.
- Fix a "BUG" warning when trying to write bridge-stats files with
the Linux syscall sandbox filter enabled. Fixes bug 12041; bugfix
on 0.2.5.1-alpha.
- Prevent the sandbox from crashing on startup when run with the
--enable-expensive-hardening configuration option. Fixes bug
11477; bugfix on 0.2.5.4-alpha.
- When running with DirPortFrontPage and sandboxing both enabled,
reload the DirPortFrontPage correctly when restarting. Fixes bug
12028; bugfix on 0.2.5.1-alpha.
- Don't try to enable the sandbox when using the Tor binary to check
its configuration, hash a passphrase, or so on. Doing so was
crashing on startup for some users. Fixes bug 11609; bugfix
on 0.2.5.1-alpha.
- Avoid warnings when running with sandboxing and node statistics
enabled at the same time. Fixes part of 12064; bugfix on
0.2.5.1-alpha. Patch from Michael Wolf.
- Avoid warnings when running with sandboxing enabled at the same
time as cookie authentication, hidden services, or directory
authority voting. Fixes part of 12064; bugfix on 0.2.5.1-alpha.
- Do not allow options that require calls to exec to be enabled
alongside the seccomp2 sandbox: they will inevitably crash. Fixes
bug 12043; bugfix on 0.2.5.1-alpha.
- Handle failures in getpwnam()/getpwuid() when running with the
User option set and the Linux syscall sandbox enabled. Fixes bug
11946; bugfix on 0.2.5.1-alpha.
- Refactor the getaddrinfo workaround that the seccomp sandbox uses
to avoid calling getaddrinfo() after installing the sandbox
filters. Previously, it preloaded a cache with the IPv4 address
for our hostname, and nothing else. Now, it loads the cache with
every address that it used to initialize the Tor process. Fixes
bug 11970; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (pluggable transports):
- Enable the ExtORPortCookieAuthFile option, to allow changing the
default location of the authentication token for the extended OR
Port as used by sever-side pluggable transports. We had
implemented this option before, but the code to make it settable
had been omitted. Fixes bug 11635; bugfix on 0.2.5.1-alpha.
- Avoid another 60-second delay when starting Tor in a pluggable-
transport-using configuration when we already have cached
descriptors for our bridges. Fixes bug 11965; bugfix
on 0.2.3.6-alpha.
o Minor bugfixes (client):
- Avoid "Tried to open a socket with DisableNetwork set" warnings
when starting a client with bridges configured and DisableNetwork
set. (Tor launcher starts Tor with DisableNetwork set the first
time it runs.) Fixes bug 10405; bugfix on 0.2.3.9-alpha.
o Minor bugfixes (testing):
- The Python parts of the test scripts now work on Python 3 as well
as Python 2, so systems where '/usr/bin/python' is Python 3 will
no longer have the tests break. Fixes bug 11608; bugfix
on 0.2.5.2-alpha.
- When looking for versions of python that we could run the tests
with, check for "python2.7" and "python3.3"; previously we were
only looking for "python", "python2", and "python3". Patch from
Dana Koch. Fixes bug 11632; bugfix on 0.2.5.2-alpha.
- Fix all valgrind warnings produced by the unit tests. There were
over a thousand memory leak warnings previously, mostly produced
by forgetting to free things in the unit test code. Fixes bug
11618, bugfixes on many versions of Tor.
o Minor bugfixes (tor-fw-helper):
- Give a correct log message when tor-fw-helper fails to launch.
(Previously, we would say something like "tor-fw-helper sent us a
string we could not parse".) Fixes bug 9781; bugfix
on 0.2.4.2-alpha.
o Minor bugfixes (relay, threading):
- Check return code on spawn_func() in cpuworker code, so that we
don't think we've spawned a nonworking cpuworker and write junk to
it forever. Fix related to bug 4345; bugfix on all released Tor
versions. Found by "skruffy".
- Use a pthread_attr to make sure that spawn_func() cannot return an
error while at the same time launching a thread. Fix related to
bug 4345; bugfix on all released Tor versions. Reported
by "cypherpunks".
o Minor bugfixes (relay, oom prevention):
- Correctly detect the total available system memory. We tried to do
this in 0.2.5.4-alpha, but the code was set up to always return an
error value, even on success. Fixes bug 11805; bugfix
on 0.2.5.4-alpha.
o Minor bugfixes (relay, other):
- We now drop CREATE cells for already-existent circuit IDs and for
zero-valued circuit IDs, regardless of other factors that might
otherwise have called for DESTROY cells. Fixes bug 12191; bugfix
on 0.0.8pre1.
- Avoid an illegal read from stack when initializing the TLS module
using a version of OpenSSL without all of the ciphers used by the
v2 link handshake. Fixes bug 12227; bugfix on 0.2.4.8-alpha. Found
by "starlight".
- When rejecting DATA cells for stream_id zero, still count them
against the circuit's deliver window so that we don't fail to send
a SENDME. Fixes bug 11246; bugfix on 0.2.4.10-alpha.
o Minor bugfixes (logging):
- Fix a misformatted log message about delayed directory fetches.
Fixes bug 11654; bugfix on 0.2.5.3-alpha.
- Squelch a spurious LD_BUG message "No origin circuit for
successful SOCKS stream" in certain hidden service failure cases;
fixes bug 10616.
o Distribution:
- Include a tor.service file in contrib/dist for use with systemd.
Some distributions will be able to use this file unmodified;
others will need to tweak it, or write their own. Patch from Jamie
Nguyen; resolves ticket 8368.
o Documentation:
- Clean up several option names in the manpage to match their real
names, add the missing documentation for a couple of testing and
directory authority options, remove the documentation for a
V2-directory fetching option that no longer exists. Resolves
ticket 11634.
- Correct the documentation so that it lists the correct directory
for the stats files. (They are in a subdirectory called "stats",
not "status".)
- In the manpage, move more authority-only options into the
directory authority section so that operators of regular directory
caches don't get confused.
o Package cleanup:
- The contrib directory has been sorted and tidied. Before, it was
an unsorted dumping ground for useful and not-so-useful things.
Now, it is divided based on functionality, and the items which
seemed to be nonfunctional or useless have been removed. Resolves
ticket 8966; based on patches from "rl1987".
o Removed code:
- Remove /tor/dbg-stability.txt URL that was meant to help debug WFU
and MTBF calculations, but that nobody was using. Fixes ticket 11742.
- The TunnelDirConns and PreferTunnelledDirConns options no longer
exist; tunneled directory connections have been available since
0.1.2.5-alpha, and turning them off is not a good idea. This is a
brute-force fix for 10849, where "TunnelDirConns 0" would break
hidden services.
Changes in version 0.2.4.22 - 2014-05-16
Tor 0.2.4.22 backports numerous high-priority fixes from the Tor 0.2.5
alpha release series. These include blocking all authority signing
keys that may have been affected by the OpenSSL "heartbleed" bug,
choosing a far more secure set of TLS ciphersuites by default, closing
a couple of memory leaks that could be used to run a target relay out
of RAM, and several others.
o Major features (security, backport from 0.2.5.4-alpha):
- Block authority signing keys that were used on authorities
vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
don't have any evidence that these keys _were_ compromised; we're
doing this to be prudent.) Resolves ticket 11464.
o Major bugfixes (security, OOM):
- Fix a memory leak that could occur if a microdescriptor parse
fails during the tokenizing step. This bug could enable a memory
exhaustion attack by directory servers. Fixes bug 11649; bugfix
on 0.2.2.6-alpha.
o Major bugfixes (TLS cipher selection, backport from 0.2.5.4-alpha):
- The relay ciphersuite list is now generated automatically based on
uniform criteria, and includes all OpenSSL ciphersuites with
acceptable strength and forward secrecy. Previously, we had left
some perfectly fine ciphersuites unsupported due to omission or
typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
'cypherpunks'. Bugfix on 0.2.4.8-alpha.
- Relays now trust themselves to have a better view than clients of
which TLS ciphersuites are better than others. (Thanks to bug
11513, the relay list is now well-considered, whereas the client
list has been chosen mainly for anti-fingerprinting purposes.)
Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
AES128. Resolves ticket 11528.
- Clients now try to advertise the same list of ciphersuites as
Firefox 28. This change enables selection of (fast) GCM
ciphersuites, disables some strange old ciphers, and stops
advertising the ECDH (not to be confused with ECDHE) ciphersuites.
Resolves ticket 11438.
o Minor bugfixes (configuration, security):
- When running a hidden service, do not allow TunneledDirConns 0:
trying to set that option together with a hidden service would
otherwise prevent the hidden service from running, and also make
it publish its descriptors directly over HTTP. Fixes bug 10849;
bugfix on 0.2.1.1-alpha.
o Minor bugfixes (controller, backport from 0.2.5.4-alpha):
- Avoid sending a garbage value to the controller when a circuit is
cannibalized. Fixes bug 11519; bugfix on 0.2.3.11-alpha.
o Minor bugfixes (exit relay, backport from 0.2.5.4-alpha):
- Stop leaking memory when we successfully resolve a PTR record.
Fixes bug 11437; bugfix on 0.2.4.7-alpha.
o Minor bugfixes (bridge client, backport from 0.2.5.4-alpha):
- Avoid 60-second delays in the bootstrapping process when Tor is
launching for a second time while using bridges. Fixes bug 9229;
bugfix on 0.2.0.3-alpha.
o Minor bugfixes (relays and bridges, backport from 0.2.5.4-alpha):
- Give the correct URL in the warning message when trying to run a
relay on an ancient version of Windows. Fixes bug 9393.
o Minor bugfixes (compilation):
- Fix a compilation error when compiling with --disable-curve25519.
Fixes bug 9700; bugfix on 0.2.4.17-rc.
o Minor bugfixes:
- Downgrade the warning severity for the the "md was still
referenced 1 node(s)" warning. Tor 0.2.5.4-alpha has better code
for trying to diagnose this bug, and the current warning in
earlier versions of tor achieves nothing useful. Addresses warning
from bug 7164.
o Minor features (log verbosity, backport from 0.2.5.4-alpha):
- When we run out of usable circuit IDs on a channel, log only one
warning for the whole channel, and describe how many circuits
there were on the channel. Fixes part of ticket 11553.
o Minor features (security, backport from 0.2.5.4-alpha):
- Decrease the lower limit of MaxMemInCellQueues to 256 MBytes (but
leave the default at 8GBytes), to better support Raspberry Pi
users. Fixes bug 9686; bugfix on 0.2.4.14-alpha.
o Documentation (backport from 0.2.5.4-alpha):
- Correctly document that we search for a system torrc file before
looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
0.2.3.18-rc.
Changes in version 0.2.5.4-alpha - 2014-04-25
Tor 0.2.5.4-alpha includes several security and performance
improvements for clients and relays, including blacklisting authority
signing keys that were used while susceptible to the OpenSSL
"heartbleed" bug, fixing two expensive functions on busy relays,
improved TLS ciphersuite preference lists, support for run-time
hardening on compilers that support AddressSanitizer, and more work on
the Linux sandbox code.
There are also several usability fixes for clients (especially clients
that use bridges), two new TransPort protocols supported (one on
OpenBSD, one on FreeBSD), and various other bugfixes.
This release marks end-of-life for Tor 0.2.2.x; those Tor versions
have accumulated many known flaws; everyone should upgrade.
o Major features (security):
- If you don't specify MaxMemInQueues yourself, Tor now tries to
pick a good value based on your total system memory. Previously,
the default was always 8 GB. You can still override the default by
setting MaxMemInQueues yourself. Resolves ticket 11396.
- Block authority signing keys that were used on authorities
vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
don't have any evidence that these keys _were_ compromised; we're
doing this to be prudent.) Resolves ticket 11464.
o Major features (relay performance):
- Speed up server-side lookups of rendezvous and introduction point
circuits by using hashtables instead of linear searches. These
functions previously accounted between 3 and 7% of CPU usage on
some busy relays. Resolves ticket 9841.
- Avoid wasting CPU when extending a circuit over a channel that is
nearly out of circuit IDs. Previously, we would do a linear scan
over possible circuit IDs before finding one or deciding that we
had exhausted our possibilities. Now, we try at most 64 random
circuit IDs before deciding that we probably won't succeed. Fixes
a possible root cause of ticket 11553.
o Major features (seccomp2 sandbox, Linux only):
- The seccomp2 sandbox can now run a test network for multiple hours
without crashing. The sandbox is still experimental, and more bugs
will probably turn up. To try it, enable "Sandbox 1" on a Linux
host. Resolves ticket 11351.
- Strengthen sandbox code: the sandbox can now test the arguments
for rename(), and blocks _sysctl() entirely. Resolves another part
of ticket 11351.
- When the sandbox blocks a system call, it now tries to log a stack
trace before exiting. Resolves ticket 11465.
o Major bugfixes (TLS cipher selection):
- The relay ciphersuite list is now generated automatically based on
uniform criteria, and includes all OpenSSL ciphersuites with
acceptable strength and forward secrecy. Previously, we had left
some perfectly fine ciphersuites unsupported due to omission or
typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
'cypherpunks'. Bugfix on 0.2.4.8-alpha.
- Relays now trust themselves to have a better view than clients of
which TLS ciphersuites are better than others. (Thanks to bug
11513, the relay list is now well-considered, whereas the client
list has been chosen mainly for anti-fingerprinting purposes.)
Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
AES128. Resolves ticket 11528.
- Clients now try to advertise the same list of ciphersuites as
Firefox 28. This change enables selection of (fast) GCM
ciphersuites, disables some strange old ciphers, and stops
advertising the ECDH (not to be confused with ECDHE) ciphersuites.
Resolves ticket 11438.
o Major bugfixes (bridge client):
- Avoid 60-second delays in the bootstrapping process when Tor is
launching for a second time while using bridges. Fixes bug 9229;
bugfix on 0.2.0.3-alpha.
o Minor features (transparent proxy, *BSD):
- Support FreeBSD's ipfw firewall interface for TransPort ports on
FreeBSD. To enable it, set "TransProxyType ipfw". Resolves ticket
10267; patch from "yurivict".
- Support OpenBSD's divert-to rules with the pf firewall for
transparent proxy ports. To enable it, set "TransProxyType
pf-divert". This allows Tor to run a TransPort transparent proxy
port on OpenBSD 4.4 or later without root privileges. See the
pf.conf(5) manual page for information on configuring pf to use
divert-to rules. Closes ticket 10896; patch from Dana Koch.
o Minor features (security):
- New --enable-expensive-hardening option to enable security
hardening options that consume nontrivial amounts of CPU and
memory. Right now, this includes AddressSanitizer and UbSan, which
are supported in newer versions of GCC and Clang. Closes ticket
11477.
o Minor features (log verbosity):
- Demote the message that we give when a flushing connection times
out for too long from NOTICE to INFO. It was usually meaningless.
Resolves ticket 5286.
- Don't log so many notice-level bootstrapping messages at startup
about downloading descriptors. Previously, we'd log a notice
whenever we learned about more routers. Now, we only log a notice
at every 5% of progress. Fixes bug 9963.
- Warn less verbosely when receiving a malformed
ESTABLISH_RENDEZVOUS cell. Fixes ticket 11279.
- When we run out of usable circuit IDs on a channel, log only one
warning for the whole channel, and describe how many circuits
there were on the channel. Fixes part of ticket 11553.
o Minor features (relay):
- If a circuit timed out for at least 3 minutes, check if we have a
new external IP address, and publish a new descriptor with the new
IP address if it changed. Resolves ticket 2454.
o Minor features (controller):
- Make the entire exit policy available from the control port via
GETINFO exit-policy/*. Implements enhancement 7952. Patch from
"rl1987".
- Because of the fix for ticket 11396, the real limit for memory
usage may no longer match the configured MaxMemInQueues value. The
real limit is now exposed via GETINFO limits/max-mem-in-queues.
o Minor features (bridge client):
- Report a more useful failure message when we can't connect to a
bridge because we don't have the right pluggable transport
configured. Resolves ticket 9665. Patch from Fábio J. Bertinatto.
o Minor features (diagnostic):
- Add more log messages to diagnose bug 7164, which causes
intermittent "microdesc_free() called but md was still referenced"
warnings. We now include more information, to figure out why we
might be cleaning a microdescriptor for being too old if it's
still referenced by a live node_t object.
o Minor bugfixes (client, DNSPort):
- When using DNSPort, try to respond to AAAA requests with AAAA
answers. Previously, we hadn't looked at the request type when
deciding which answer type to prefer. Fixes bug 10468; bugfix on
0.2.4.7-alpha.
- When receiving a DNS query for an unsupported record type, reply
with no answer rather than with a NOTIMPL error. This behavior
isn't correct either, but it will break fewer client programs, we
hope. Fixes bug 10268; bugfix on 0.2.0.1-alpha. Original patch
from "epoch".
o Minor bugfixes (exit relay):
- Stop leaking memory when we successfully resolve a PTR record.
Fixes bug 11437; bugfix on 0.2.4.7-alpha.
o Minor bugfixes (bridge client):
- Stop accepting bridge lines containing hostnames. Doing so would
cause clients to perform DNS requests on the hostnames, which was
not sensible behavior. Fixes bug 10801; bugfix on 0.2.0.1-alpha.
- Avoid a 60-second delay in the bootstrapping process when a Tor
client with pluggable transports re-reads its configuration at
just the wrong time. Re-fixes bug 11156; bugfix on 0.2.5.3-alpha.
o Minor bugfixes (client, logging during bootstrap):
- Warn only once if we start logging in an unsafe way. Previously,
we complain as many times as we had problems. Fixes bug 9870;
bugfix on 0.2.5.1-alpha.
- Only report the first fatal bootstrap error on a given OR
connection. This stops us from telling the controller bogus error
messages like "DONE". Fixes bug 10431; bugfix on 0.2.1.1-alpha.
- Be more helpful when trying to run sandboxed on Linux without
libseccomp. Instead of saying "Sandbox is not implemented on this
platform", we now explain that we need to be built with
libseccomp. Fixes bug 11543; bugfix on 0.2.5.1-alpha.
- Avoid generating spurious warnings when starting with
DisableNetwork enabled. Fixes bug 11200 and bug 10405; bugfix on
0.2.3.9-alpha.
o Minor bugfixes (closing OR connections):
- If write_to_buf() in connection_write_to_buf_impl_() ever fails,
check if it's an or_connection_t and correctly call
connection_or_close_for_error() rather than
connection_mark_for_close() directly. Fixes bug 11304; bugfix on
0.2.4.4-alpha.
- When closing all connections on setting DisableNetwork to 1, use
connection_or_close_normally() rather than closing OR connections
out from under the channel layer. Fixes bug 11306; bugfix on
0.2.4.4-alpha.
o Minor bugfixes (controller):
- Avoid sending a garbage value to the controller when a circuit is
cannibalized. Fixes bug 11519; bugfix on 0.2.3.11-alpha.
o Minor bugfixes (tor-fw-helper):
- Allow tor-fw-helper to build again by adding src/ext to its
CPPFLAGS. Fixes bug 11296; bugfix on 0.2.5.3-alpha.
o Minor bugfixes (bridges):
- Avoid potential crashes or bad behavior when launching a
server-side managed proxy with ORPort or ExtORPort temporarily
disabled. Fixes bug 9650; bugfix on 0.2.3.16-alpha.
o Minor bugfixes (platform-specific):
- Fix compilation on Solaris, which does not have <endian.h>. Fixes
bug 11426; bugfix on 0.2.5.3-alpha.
- When dumping a malformed directory object to disk, save it in
binary mode on Windows, not text mode. Fixes bug 11342; bugfix on
0.2.2.1-alpha.
- Don't report failures from make_socket_reuseable() on incoming
sockets on OSX: this can happen when incoming connections close
early. Fixes bug 10081.
o Minor bugfixes (trivial memory leaks):
- Fix a small memory leak when signing a directory object. Fixes bug
11275; bugfix on 0.2.4.13-alpha.
- Free placeholder entries in our circuit table at exit; fixes a
harmless memory leak. Fixes bug 11278; bugfix on 0.2.5.1-alpha.
- Don't re-initialize a second set of OpenSSL mutexes when starting
up. Previously, we'd make one set of mutexes, and then immediately
replace them with another. Fixes bug 11726; bugfix on
0.2.5.3-alpha.
- Resolve some memory leaks found by coverity in the unit tests, on
exit in tor-gencert, and on a failure to compute digests for our
own keys when generating a v3 networkstatus vote. These leaks
should never have affected anyone in practice.
o Minor bugfixes (hidden service):
- Only retry attempts to connect to a chosen rendezvous point 8
times, not 30. Fixes bug 4241; bugfix on 0.1.0.1-rc.
o Minor bugfixes (misc code correctness):
- Fix various instances of undefined behavior in channeltls.c,
tor_memmem(), and eventdns.c that would cause us to construct
pointers to memory outside an allocated object. (These invalid
pointers were not accessed, but C does not even allow them to
exist.) Fixes bug 10363; bugfixes on 0.1.1.1-alpha, 0.1.2.1-alpha,
0.2.0.10-alpha, and 0.2.3.6-alpha. Reported by "bobnomnom".
- Use the AddressSanitizer and Ubsan sanitizers (in clang-3.4) to
fix some miscellaneous errors in our tests and codebase. Fixes bug
11232. Bugfixes on versions back as far as 0.2.1.11-alpha.
- Always check return values for unlink, munmap, UnmapViewOfFile;
check strftime return values more often. In some cases all we can
do is report a warning, but this may help prevent deeper bugs from
going unnoticed. Closes ticket 8787; bugfixes on many, many tor
versions.
- Fix numerous warnings from the clang "scan-build" static analyzer.
Some of these are programming style issues; some of them are false
positives that indicated awkward code; some are undefined behavior
cases related to constructing (but not using) invalid pointers;
some are assumptions about API behavior; some are (harmlessly)
logging sizeof(ptr) bytes from a token when sizeof(*ptr) would be
correct; and one or two are genuine bugs that weren't reachable
from the rest of the program. Fixes bug 8793; bugfixes on many,
many tor versions.
o Documentation:
- Build the torify.1 manpage again. Previously, we were only trying
to build it when also building tor-fw-helper. That's why we didn't
notice that we'd broken the ability to build it. Fixes bug 11321;
bugfix on 0.2.5.1-alpha.
- Fix the layout of the SOCKSPort flags in the manpage. Fixes bug
11061; bugfix on 0.2.4.7-alpha.
- Correctly document that we search for a system torrc file before
looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
0.2.3.18-rc.
- Resolve warnings from Doxygen.
o Code simplifications and refactoring:
- Remove is_internal_IP() function. Resolves ticket 4645.
- Remove unused function circuit_dump_by_chan from circuitlist.c.
Closes issue 9107; patch from "marek".
- Change our use of the ENUM_BF macro to avoid declarations that
confuse Doxygen.
o Deprecated versions:
- Tor 0.2.2.x has reached end-of-life; it has received no patches or
attention for some while. Directory authorities no longer accept
descriptors from relays running any version of Tor prior to Tor
0.2.3.16-alpha. Resolves ticket 11149.
o Testing:
- New macros in test.h to simplify writing mock-functions for unit
tests. Part of ticket 11507. Patch from Dana Koch.
- Complete tests for the status.c module. Resolves ticket 11507.
Patch from Dana Koch.
o Removed code:
- Remove all code for the long unused v1 directory protocol.
Resolves ticket 11070.
Changes in version 0.2.5.3-alpha - 2014-03-22
Tor 0.2.5.3-alpha includes all the fixes from 0.2.4.21. It contains
two new anti-DoS features for Tor relays, resolves a bug that kept
SOCKS5 support for IPv6 from working, fixes several annoying usability
issues for bridge users, and removes more old code for unused
directory formats.
The Tor 0.2.5.x release series is now in patch-freeze: no feature
patches not already written will be considered for inclusion in 0.2.5.x.
o Major features (relay security, DoS-resistance):
- When deciding whether we have run out of memory and we need to
close circuits, also consider memory allocated in buffers for
streams attached to each circuit.
This change, which extends an anti-DoS feature introduced in
0.2.4.13-alpha and improved in 0.2.4.14-alpha, lets Tor exit relays
better resist more memory-based DoS attacks than before. Since the
MaxMemInCellQueues option now applies to all queues, it is renamed
to MaxMemInQueues. This feature fixes bug 10169.
- Avoid hash-flooding denial-of-service attacks by using the secure
SipHash-2-4 hash function for our hashtables. Without this
feature, an attacker could degrade performance of a targeted
client or server by flooding their data structures with a large
number of entries to be stored at the same hash table position,
thereby slowing down the Tor instance. With this feature, hash
table positions are derived from a randomized cryptographic key,
and an attacker cannot predict which entries will collide. Closes
ticket 4900.
- Decrease the lower limit of MaxMemInQueues to 256 MBytes (but leave
the default at 8GBytes), to better support Raspberry Pi users. Fixes
bug 9686; bugfix on 0.2.4.14-alpha.
o Minor features (bridges, pluggable transports):
- Bridges now write the SHA1 digest of their identity key
fingerprint (that is, a hash of a hash of their public key) to
notice-level logs, and to a new hashed-fingerprint file. This
information will help bridge operators look up their bridge in
Globe and similar tools. Resolves ticket 10884.
- Improve the message that Tor displays when running as a bridge
using pluggable transports without an Extended ORPort listener.
Also, log the message in the log file too. Resolves ticket 11043.
o Minor features (other):
- Add a new option, PredictedPortsRelevanceTime, to control how long
after having received a request to connect to a given port Tor
will try to keep circuits ready in anticipation of future requests
for that port. Patch from "unixninja92"; implements ticket 9176.
- Generate a warning if any ports are listed in the SocksPolicy,
DirPolicy, AuthDirReject, AuthDirInvalid, AuthDirBadDir, or
AuthDirBadExit options. (These options only support address
ranges.) Fixes part of ticket 11108.
- Update geoip and geoip6 to the February 7 2014 Maxmind GeoLite2
Country database.
o Minor bugfixes (new since 0.2.5.2-alpha, also in 0.2.4.21):
- Build without warnings under clang 3.4. (We have some macros that
define static functions only some of which will get used later in
the module. Starting with clang 3.4, these give a warning unless the
unused attribute is set on them.) Resolves ticket 10904.
- Fix build warnings about missing "a2x" comment when building the
manpages from scratch on OpenBSD; OpenBSD calls it "a2x.py".
Fixes bug 10929; bugfix on 0.2.2.9-alpha. Patch from Dana Koch.
o Minor bugfixes (client):
- Improve the log message when we can't connect to a hidden service
because all of the hidden service directory nodes hosting its
descriptor are excluded. Improves on our fix for bug 10722, which
was a bugfix on 0.2.0.10-alpha.
- Raise a control port warning when we fail to connect to all of
our bridges. Previously, we didn't inform the controller, and
the bootstrap process would stall. Fixes bug 11069; bugfix on
0.2.1.2-alpha.
- Exit immediately when a process-owning controller exits.
Previously, tor relays would wait for a little while after their
controller exited, as if they had gotten an INT signal -- but this
was problematic, since there was no feedback for the user. To do a
clean shutdown, controllers should send an INT signal and give Tor
a chance to clean up. Fixes bug 10449; bugfix on 0.2.2.28-beta.
- Stop attempting to connect to bridges before our pluggable
transports are configured (harmless but resulted in some erroneous
log messages). Fixes bug 11156; bugfix on 0.2.3.2-alpha.
- Fix connections to IPv6 addresses over SOCKS5. Previously, we were
generating incorrect SOCKS5 responses, and confusing client
applications. Fixes bug 10987; bugfix on 0.2.4.7-alpha.
o Minor bugfixes (relays and bridges):
- Avoid crashing on a malformed resolv.conf file when running a
relay using Libevent 1. Fixes bug 8788; bugfix on 0.1.1.23.
- Non-exit relays no longer launch mock DNS requests to check for
DNS hijacking. This has been unnecessary since 0.2.1.7-alpha, when
non-exit relays stopped servicing DNS requests. Fixes bug 965;
bugfix on 0.2.1.7-alpha. Patch from Matt Pagan.
- Bridges now report complete directory request statistics. Related
to bug 5824; bugfix on 0.2.2.1-alpha.
- Bridges now never collect statistics that were designed for
relays. Fixes bug 5824; bugfix on 0.2.3.8-alpha.
- Stop giving annoying warning messages when we decide not to launch
a pluggable transport proxy that we don't need (because there are
no bridges configured to use it). Resolves ticket 5018; bugfix
on 0.2.5.2-alpha.
- Give the correct URL in the warning message when trying to run a
relay on an ancient version of Windows. Fixes bug 9393.
o Minor bugfixes (backtrace support):
- Support automatic backtraces on more platforms by using the
"-fasynchronous-unwind-tables" compiler option. This option is
needed for platforms like 32-bit Intel where "-fomit-frame-pointer"
is on by default and table generation is not. This doesn't yet
add Windows support; only Linux, OSX, and some BSDs are affected.
Reported by 'cypherpunks'; fixes bug 11047; bugfix on 0.2.5.2-alpha.
- Avoid strange behavior if two threads hit failed assertions at the
same time and both try to log backtraces at once. (Previously, if
this had happened, both threads would have stored their intermediate
results in the same buffer, and generated junk outputs.) Reported by
"cypherpunks". Fixes bug 11048; bugfix on 0.2.5.2-alpha.
- Fix a compiler warning in format_number_sigsafe(). Bugfix on
0.2.5.2-alpha; patch from Nick Hopper.
o Minor bugfixes (unit tests):
- Fix a small bug in the unit tests that might have made the tests
call 'chmod' with an uninitialized bitmask. Fixes bug 10928;
bugfix on 0.2.5.1-alpha. Patch from Dana Koch.
o Removed code:
- Remove all remaining code related to version-0 hidden service
descriptors: they have not been in use since 0.2.2.1-alpha. Fixes
the rest of bug 10841.
o Documentation:
- Document in the manpage that "KBytes" may also be written as
"kilobytes" or "KB", that "Kbits" may also be written as
"kilobits", and so forth. Closes ticket 9222.
- Document that the ClientOnly config option overrides ORPort.
Our old explanation made ClientOnly sound as though it did
nothing at all. Resolves bug 9059.
- Explain that SocksPolicy, DirPolicy, and similar options don't
take port arguments. Fixes the other part of ticket 11108.
- Fix a comment about the rend_server_descriptor_t.protocols field
to more accurately describe its range. Also, make that field
unsigned, to more accurately reflect its usage. Fixes bug 9099;
bugfix on 0.2.1.5-alpha.
- Fix the manpage's description of HiddenServiceAuthorizeClient:
the maximum client name length is 16, not 19. Fixes bug 11118;
bugfix on 0.2.1.6-alpha.
o Code simplifications and refactoring:
- Get rid of router->address, since in all cases it was just the
string representation of router->addr. Resolves ticket 5528.
o Test infrastructure:
- Update to the latest version of tinytest.
- Improve the tinytest implementation of string operation tests so
that comparisons with NULL strings no longer crash the tests; they
now just fail, normally. Fixes bug 9004; bugfix on 0.2.2.4-alpha.
Changes in version 0.2.4.21 - 2014-02-28
Tor 0.2.4.21 further improves security against potential adversaries who
find breaking 1024-bit crypto doable, and backports several stability
and robustness patches from the 0.2.5 branch.
o Major features (client security):
- When we choose a path for a 3-hop circuit, make sure it contains
at least one relay that supports the NTor circuit extension
handshake. Otherwise, there is a chance that we're building
a circuit that's worth attacking by an adversary who finds
breaking 1024-bit crypto doable, and that chance changes the game
theory. Implements ticket 9777.
o Major bugfixes:
- Do not treat streams that fail with reason
END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
since it could also indicate an ENETUNREACH connection error. Fixes
part of bug 10777; bugfix on 0.2.4.8-alpha.
o Code simplification and refactoring:
- Remove data structures which were introduced to implement the
CellStatistics option: they are now redundant with the new timestamp
field in the regular packed_cell_t data structure, which we did
in 0.2.4.18-rc in order to resolve bug 9093. Resolves ticket 10870.
o Minor features:
- Always clear OpenSSL bignums before freeing them -- even bignums
that don't contain secrets. Resolves ticket 10793. Patch by
Florent Daigniere.
- Build without warnings under clang 3.4. (We have some macros that
define static functions only some of which will get used later in
the module. Starting with clang 3.4, these give a warning unless the
unused attribute is set on them.) Resolves ticket 10904.
- Update geoip and geoip6 files to the February 7 2014 Maxmind
GeoLite2 Country database.
o Minor bugfixes:
- Set the listen() backlog limit to the largest actually supported
on the system, not to the value in a header file. Fixes bug 9716;
bugfix on every released Tor.
- Treat ENETUNREACH, EACCES, and EPERM connection failures at an
exit node as a NOROUTE error, not an INTERNAL error, since they
can apparently happen when trying to connect to the wrong sort
of netblocks. Fixes part of bug 10777; bugfix on 0.1.0.1-rc.
- Fix build warnings about missing "a2x" comment when building the
manpages from scratch on OpenBSD; OpenBSD calls it "a2x.py".
Fixes bug 10929; bugfix on 0.2.2.9-alpha. Patch from Dana Koch.
- Avoid a segfault on SIGUSR1, where we had freed a connection but did
not entirely remove it from the connection lists. Fixes bug 9602;
bugfix on 0.2.4.4-alpha.
- Fix a segmentation fault in our benchmark code when running with
Fedora's OpenSSL package, or any other OpenSSL that provides
ECDH but not P224. Fixes bug 10835; bugfix on 0.2.4.8-alpha.
- Turn "circuit handshake stats since last time" log messages into a
heartbeat message. Fixes bug 10485; bugfix on 0.2.4.17-rc.
o Documentation fixes:
- Document that all but one DirPort entry must have the NoAdvertise
flag set. Fixes bug 10470; bugfix on 0.2.3.3-alpha / 0.2.3.16-alpha.
Changes in version 0.2.5.2-alpha - 2014-02-13
Tor 0.2.5.2-alpha includes all the fixes from 0.2.4.18-rc and 0.2.4.20,
like the "poor random number generation" fix and the "building too many
circuits" fix. It also further improves security against potential
adversaries who find breaking 1024-bit crypto doable, and launches
pluggable transports on demand (which gets us closer to integrating
pluggable transport support by default -- not to be confused with Tor
bundles enabling pluggable transports and bridges by default).
o Major features (client security):
- When we choose a path for a 3-hop circuit, make sure it contains
at least one relay that supports the NTor circuit extension
handshake. Otherwise, there is a chance that we're building
a circuit that's worth attacking by an adversary who finds
breaking 1024-bit crypto doable, and that chance changes the game
theory. Implements ticket 9777.
- Clients now look at the "usecreatefast" consensus parameter to
decide whether to use CREATE_FAST or CREATE cells for the first hop
of their circuit. This approach can improve security on connections
where Tor's circuit handshake is stronger than the available TLS
connection security levels, but the tradeoff is more computational
load on guard relays. Implements proposal 221. Resolves ticket 9386.
o Major features (bridges):
- Don't launch pluggable transport proxies if we don't have any
bridges configured that would use them. Now we can list many
pluggable transports, and Tor will dynamically start one when it
hears a bridge address that needs it. Resolves ticket 5018.
- The bridge directory authority now assigns status flags (Stable,
Guard, etc) to bridges based on thresholds calculated over all
Running bridges. Now bridgedb can finally make use of its features
to e.g. include at least one Stable bridge in its answers. Fixes
bug 9859.
o Major features (other):
- Extend ORCONN controller event to include an "ID" parameter,
and add four new controller event types CONN_BW, CIRC_BW,
CELL_STATS, and TB_EMPTY that show connection and circuit usage.
The new events are emitted in private Tor networks only, with the
goal of being able to better track performance and load during
full-network simulations. Implements proposal 218 and ticket 7359.
- On some platforms (currently: recent OSX versions, glibc-based
platforms that support the ELF format, and a few other
Unix-like operating systems), Tor can now dump stack traces
when a crash occurs or an assertion fails. By default, traces
are dumped to stderr (if possible) and to any logs that are
reporting errors. Implements ticket 9299.
o Major bugfixes:
- Avoid a segfault on SIGUSR1, where we had freed a connection but did
not entirely remove it from the connection lists. Fixes bug 9602;
bugfix on 0.2.4.4-alpha.
- Do not treat streams that fail with reason
END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
since it could also indicate an ENETUNREACH connection error. Fixes
part of bug 10777; bugfix on 0.2.4.8-alpha.
o Major bugfixes (new since 0.2.5.1-alpha, also in 0.2.4.20):
- Do not allow OpenSSL engines to replace the PRNG, even when
HardwareAccel is set. The only default builtin PRNG engine uses
the Intel RDRAND instruction to replace the entire PRNG, and
ignores all attempts to seed it with more entropy. That's
cryptographically stupid: the right response to a new alleged
entropy source is never to discard all previously used entropy
sources. Fixes bug 10402; works around behavior introduced in
OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
and "rl1987".
- Fix assertion failure when AutomapHostsOnResolve yields an IPv6
address. Fixes bug 10465; bugfix on 0.2.4.7-alpha.
- Avoid launching spurious extra circuits when a stream is pending.
This fixes a bug where any circuit that _wasn't_ unusable for new
streams would be treated as if it were, causing extra circuits to
be launched. Fixes bug 10456; bugfix on 0.2.4.12-alpha.
o Major bugfixes (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
- No longer stop reading or writing on cpuworker connections when
our rate limiting buckets go empty. Now we should handle circuit
handshake requests more promptly. Resolves bug 9731.
- Stop trying to bootstrap all our directory information from
only our first guard. Discovered while fixing bug 9946; bugfix
on 0.2.4.8-alpha.
o Minor features (bridges, pluggable transports):
- Add threshold cutoffs to the networkstatus document created by
the Bridge Authority. Fixes bug 1117.
- On Windows, spawn background processes using the CREATE_NO_WINDOW
flag. Now Tor Browser Bundle 3.5 with pluggable transports enabled
doesn't pop up a blank console window. (In Tor Browser Bundle 2.x,
Vidalia set this option for us.) Implements ticket 10297.
o Minor features (security):
- Always clear OpenSSL bignums before freeing them -- even bignums
that don't contain secrets. Resolves ticket 10793. Patch by
Florent Daignière.
o Minor features (config options and command line):
- Add an --allow-missing-torrc commandline option that tells Tor to
run even if the configuration file specified by -f is not available.
Implements ticket 10060.
- Add support for the TPROXY transparent proxying facility on Linux.
See documentation for the new TransProxyType option for more
details. Implementation by "thomo". Closes ticket 10582.
o Minor features (controller):
- Add a new "HS_DESC" controller event that reports activities
related to hidden service descriptors. Resolves ticket 8510.
- New "DROPGUARDS" controller command to forget all current entry
guards. Not recommended for ordinary use, since replacing guards
too frequently makes several attacks easier. Resolves ticket 9934;
patch from "ra".
o Minor features (build):
- Assume that a user using ./configure --host wants to cross-compile,
and give an error if we cannot find a properly named
tool-chain. Add a --disable-tool-name-check option to proceed
nevertheless. Addresses ticket 9869. Patch by Benedikt Gollatz.
- If we run ./configure and the compiler recognizes -fstack-protector
but the linker rejects it, warn the user about a potentially missing
libssp package. Addresses ticket 9948. Patch from Benedikt Gollatz.
o Minor features (testing):
- If Python is installed, "make check" now runs extra tests beyond
the unit test scripts.
- When bootstrapping a test network, sometimes very few relays get
the Guard flag. Now a new option "TestingDirAuthVoteGuard" can
specify a set of relays which should be voted Guard regardless of
their uptime or bandwidth. Addresses ticket 9206.
o Minor features (log messages):
- When ServerTransportPlugin is set on a bridge, Tor can write more
useful statistics about bridge use in its extrainfo descriptors,
but only if the Extended ORPort ("ExtORPort") is set too. Add a
log message to inform the user in this case. Resolves ticket 9651.
- When receiving a new controller connection, log the origin address.
Resolves ticket 9698; patch from "sigpipe".
- When logging OpenSSL engine status at startup, log the status of
more engines. Fixes ticket 10043; patch from Joshua Datko.
- Turn "circuit handshake stats since last time" log messages into a
heartbeat message. Fixes bug 10485; bugfix on 0.2.4.17-rc.
o Minor features (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
- Improve the circuit queue out-of-memory handler. Previously, when
we ran low on memory, we'd close whichever circuits had the most
queued cells. Now, we close those that have the *oldest* queued
cells, on the theory that those are most responsible for us
running low on memory. Based on analysis from a forthcoming paper
by Jansen, Tschorsch, Johnson, and Scheuermann. Fixes bug 9093.
- Generate bootstrapping status update events correctly when fetching
microdescriptors. Fixes bug 9927.
- Update to the October 2 2013 Maxmind GeoLite Country database.
o Minor bugfixes (clients):
- When closing a channel that has already been open, do not close
pending circuits that were waiting to connect to the same relay.
Fixes bug 9880; bugfix on 0.2.5.1-alpha. Thanks to skruffy for
finding this bug.
o Minor bugfixes (relays):
- Treat ENETUNREACH, EACCES, and EPERM connection failures at an
exit node as a NOROUTE error, not an INTERNAL error, since they
can apparently happen when trying to connect to the wrong sort
of netblocks. Fixes part of bug 10777; bugfix on 0.1.0.1-rc.
o Minor bugfixes (bridges):
- Fix a bug where the first connection works to a bridge that uses a
pluggable transport with client-side parameters, but we don't send
the client-side parameters on subsequent connections. (We don't
use any pluggable transports with client-side parameters yet,
but ScrambleSuit will soon become the first one.) Fixes bug 9162;
bugfix on 0.2.0.3-alpha. Based on a patch from "rl1987".
o Minor bugfixes (node selection):
- If ExcludeNodes is set, consider non-excluded hidden service
directory servers before excluded ones. Do not consider excluded
hidden service directory servers at all if StrictNodes is
set. (Previously, we would sometimes decide to connect to those
servers, and then realize before we initiated a connection that
we had excluded them.) Fixes bug 10722; bugfix on 0.2.0.10-alpha.
Reported by "mr-4".
- If we set the ExitNodes option but it doesn't include any nodes
that have the Exit flag, we would choose not to bootstrap. Now we
bootstrap so long as ExitNodes includes nodes which can exit to
some port. Fixes bug 10543; bugfix on 0.2.4.10-alpha.
o Minor bugfixes (controller and command-line):
- If changing a config option via "setconf" fails in a recoverable
way, we used to nonetheless write our new control ports to the
file described by the "ControlPortWriteToFile" option. Now we only
write out that file if we successfully switch to the new config
option. Fixes bug 5605; bugfix on 0.2.2.26-beta. Patch from "Ryman".
- When a command-line option such as --version or --help that
ordinarily implies --hush appears on the command line along with
--quiet, then actually obey --quiet. Previously, we obeyed --quiet
only if it appeared later on the command line. Fixes bug 9578;
bugfix on 0.2.5.1-alpha.
o Minor bugfixes (code correctness):
- Previously we used two temporary files when writing descriptors to
disk; now we only use one. Fixes bug 1376.
- Remove an erroneous (but impossible and thus harmless) pointer
comparison that would have allowed compilers to skip a bounds
check in channeltls.c. Fixes bugs 10313 and 9980; bugfix on
0.2.0.10-alpha. Noticed by Jared L Wong and David Fifield.
- Fix an always-true assertion in pluggable transports code so it
actually checks what it was trying to check. Fixes bug 10046;
bugfix on 0.2.3.9-alpha. Found by "dcb".
o Minor bugfixes (protocol correctness):
- When receiving a VERSIONS cell with an odd number of bytes, close
the connection immediately since the cell is malformed. Fixes bug
10365; bugfix on 0.2.0.10-alpha. Spotted by "bobnomnom"; fix by
"rl1987".
o Minor bugfixes (build):
- Restore the ability to compile Tor with V2_HANDSHAKE_SERVER
turned off (that is, without support for v2 link handshakes). Fixes
bug 4677; bugfix on 0.2.3.2-alpha. Patch from "piet".
- Fix compilation warnings and startup issues when running with
"Sandbox 1" and libseccomp-2.1.0. Fixes bug 10563; bugfix on
0.2.5.1-alpha.
- Fix compilation on Solaris 9, which didn't like us having an
identifier named "sun". Fixes bug 10565; bugfix in 0.2.5.1-alpha.
o Minor bugfixes (testing):
- Fix a segmentation fault in our benchmark code when running with
Fedora's OpenSSL package, or any other OpenSSL that provides
ECDH but not P224. Fixes bug 10835; bugfix on 0.2.4.8-alpha.
o Minor bugfixes (log messages):
- Fix a bug where clients using bridges would report themselves
as 50% bootstrapped even without a live consensus document.
Fixes bug 9922; bugfix on 0.2.1.1-alpha.
- Suppress a warning where, if there's only one directory authority
in the network, we would complain that votes and signatures cannot
be uploaded to other directory authorities. Fixes bug 10842;
bugfix on 0.2.2.26-beta.
- Report bootstrapping progress correctly when we're downloading
microdescriptors. We had updated our "do we have enough microdescs
to begin building circuits?" logic most recently in 0.2.4.10-alpha
(see bug 5956), but we left the bootstrap status event logic at
"how far through getting 1/4 of them are we?" Fixes bug 9958;
bugfix on 0.2.2.36, which is where they diverged (see bug 5343).
o Minor bugfixes (new since 0.2.5.1-alpha, also in 0.2.4.20):
- Avoid a crash bug when starting with a corrupted microdescriptor
cache file. Fixes bug 10406; bugfix on 0.2.2.6-alpha.
- If we fail to dump a previously cached microdescriptor to disk, avoid
freeing duplicate data later on. Fixes bug 10423; bugfix on
0.2.4.13-alpha. Spotted by "bobnomnom".
o Minor bugfixes on 0.2.4.x (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
- Correctly log long IPv6 exit policies, instead of truncating them
or reporting an error. Fixes bug 9596; bugfix on 0.2.4.7-alpha.
- Our default TLS ecdhe groups were backwards: we meant to be using
P224 for relays (for performance win) and P256 for bridges (since
it is more common in the wild). Instead we had it backwards. After
reconsideration, we decided that the default should be P256 on all
hosts, since its security is probably better, and since P224 is
reportedly used quite little in the wild. Found by "skruffy" on
IRC. Fix for bug 9780; bugfix on 0.2.4.8-alpha.
- Free directory authority certificate download statuses on exit
rather than leaking them. Fixes bug 9644; bugfix on 0.2.4.13-alpha.
o Minor bugfixes on 0.2.3.x (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
- If the guard we choose first doesn't answer, we would try the
second guard, but once we connected to the second guard we would
abandon it and retry the first one, slowing down bootstrapping.
The fix is to treat all our initially chosen guards as acceptable
to use. Fixes bug 9946; bugfix on 0.1.1.11-alpha.
- Fix an assertion failure that would occur when disabling the
ORPort setting on a running Tor process while accounting was
enabled. Fixes bug 6979; bugfix on 0.2.2.18-alpha.
- When examining the list of network interfaces to find our address,
do not consider non-running or disabled network interfaces. Fixes
bug 9904; bugfix on 0.2.3.11-alpha. Patch from "hantwister".
- Avoid an off-by-one error when checking buffer boundaries when
formatting the exit status of a pluggable transport helper.
This is probably not an exploitable bug, but better safe than
sorry. Fixes bug 9928; bugfix on 0.2.3.18-rc. Bug found by
Pedro Ribeiro.
o Removed code and features:
- Clients now reject any directory authority certificates lacking
a dir-key-crosscert element. These have been included since
0.2.1.9-alpha, so there's no real reason for them to be optional
any longer. Completes proposal 157. Resolves ticket 10162.
- Remove all code that existed to support the v2 directory system,
since there are no longer any v2 directory authorities. Resolves
ticket 10758.
- Remove the HSAuthoritativeDir and AlternateHSAuthority torrc
options, which were used for designating authorities as "Hidden
service authorities". There has been no use of hidden service
authorities since 0.2.2.1-alpha, when we stopped uploading or
downloading v0 hidden service descriptors. Fixes bug 10881; also
part of a fix for bug 10841.
o Code simplification and refactoring:
- Remove some old fallback code designed to keep Tor clients working
in a network with only two working relays. Elsewhere in the code we
have long since stopped supporting such networks, so there wasn't
much point in keeping it around. Addresses ticket 9926.
- Reject 0-length EXTEND2 cells more explicitly. Fixes bug 10536;
bugfix on 0.2.4.8-alpha. Reported by "cypherpunks".
- Remove data structures which were introduced to implement the
CellStatistics option: they are now redundant with the addition
of a timestamp to the regular packed_cell_t data structure, which
we did in 0.2.4.18-rc in order to resolve ticket 9093. Implements
ticket 10870.
o Documentation (man page) fixes:
- Update manpage to describe some of the files you can expect to
find in Tor's DataDirectory. Addresses ticket 9839.
- Document that all but one DirPort entry must have the NoAdvertise
flag set. Fixes bug 10470; bugfix on 0.2.3.3-alpha / 0.2.3.16-alpha.
o Documentation fixes (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
- Clarify the usage and risks of setting the ContactInfo torrc line
for your relay or bridge. Resolves ticket 9854.
- Add anchors to the manpage so we can link to the html version of
the documentation for specific options. Resolves ticket 9866.
- Replace remaining references to DirServer in man page and
log entries. Resolves ticket 10124.
o Tool changes:
- Make the "tor-gencert" tool used by directory authority operators
create 2048-bit signing keys by default (rather than 1024-bit, since
1024-bit is uncomfortably small these days). Addresses ticket 10324.
Changes in version 0.2.4.20 - 2013-12-22
Tor 0.2.4.20 fixes potentially poor random number generation for users
who 1) use OpenSSL 1.0.0 or later, 2) set "HardwareAccel 1" in their
torrc file, 3) have "Sandy Bridge" or "Ivy Bridge" Intel processors,
and 4) have no state file in their DataDirectory (as would happen on
first start). Users who generated relay or hidden service identity
keys in such a situation should discard them and generate new ones.
This release also fixes a logic error that caused Tor clients to build
many more preemptive circuits than they actually need.
o Major bugfixes:
- Do not allow OpenSSL engines to replace the PRNG, even when
HardwareAccel is set. The only default builtin PRNG engine uses
the Intel RDRAND instruction to replace the entire PRNG, and
ignores all attempts to seed it with more entropy. That's
cryptographically stupid: the right response to a new alleged
entropy source is never to discard all previously used entropy
sources. Fixes bug 10402; works around behavior introduced in
OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
and "rl1987".
- Fix assertion failure when AutomapHostsOnResolve yields an IPv6
address. Fixes bug 10465; bugfix on 0.2.4.7-alpha.
- Avoid launching spurious extra circuits when a stream is pending.
This fixes a bug where any circuit that _wasn't_ unusable for new
streams would be treated as if it were, causing extra circuits to
be launched. Fixes bug 10456; bugfix on 0.2.4.12-alpha.
o Minor bugfixes:
- Avoid a crash bug when starting with a corrupted microdescriptor
cache file. Fixes bug 10406; bugfix on 0.2.2.6-alpha.
- If we fail to dump a previously cached microdescriptor to disk, avoid
freeing duplicate data later on. Fixes bug 10423; bugfix on
0.2.4.13-alpha. Spotted by "bobnomnom".
Changes in version 0.2.4.19 - 2013-12-11
The Tor 0.2.4 release series is dedicated to the memory of Aaron Swartz
(1986-2013). Aaron worked on diverse projects including helping to guide
Creative Commons, playing a key role in stopping SOPA/PIPA, bringing
transparency to the U.S government's PACER documents, and contributing
design and development for Tor and Tor2Web. Aaron was one of the latest
martyrs in our collective fight for civil liberties and human rights,
and his death is all the more painful because he was one of us.
Tor 0.2.4.19, the first stable release in the 0.2.4 branch, features
a new circuit handshake and link encryption that use ECC to provide
better security and efficiency; makes relays better manage circuit
creation requests; uses "directory guards" to reduce client enumeration
risks; makes bridges collect and report statistics about the pluggable
transports they support; cleans up and improves our geoip database;
gets much closer to IPv6 support for clients, bridges, and relays; makes
directory authorities use measured bandwidths rather than advertised
ones when computing flags and thresholds; disables client-side DNS
caching to reduce tracking risks; and fixes a big bug in bridge
reachability testing. This release introduces two new design
abstractions in the code: a new "channel" abstraction between circuits
and or_connections to allow for implementing alternate relay-to-relay
transports, and a new "circuitmux" abstraction storing the queue of
circuits for a channel. The release also includes many stability,
security, and privacy fixes.
Changes in version 0.2.4.18-rc - 2013-11-16
Tor 0.2.4.18-rc is the fourth release candidate for the Tor 0.2.4.x
series. It takes a variety of fixes from the 0.2.5.x branch to improve
stability, performance, and better handling of edge cases.
o Major features:
- Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
renegotiation from working with TLS 1.1 or 1.2, so we had disabled
them to solve bug 6033.)
o Major bugfixes:
- No longer stop reading or writing on cpuworker connections when
our rate limiting buckets go empty. Now we should handle circuit
handshake requests more promptly. Resolves bug 9731.
- If we are unable to save a microdescriptor to the journal, do not
drop it from memory and then reattempt downloading it. Fixes bug
9645; bugfix on 0.2.2.6-alpha.
- Stop trying to bootstrap all our directory information from
only our first guard. Discovered while fixing bug 9946; bugfix
on 0.2.4.8-alpha.
- The new channel code sometimes lost track of in-progress circuits,
causing long-running clients to stop building new circuits. The
fix is to always call circuit_n_chan_done(chan, 0) from
channel_closed(). Fixes bug 9776; bugfix on 0.2.4.17-rc.
o Minor bugfixes (on 0.2.4.x):
- Correctly log long IPv6 exit policies, instead of truncating them
or reporting an error. Fixes bug 9596; bugfix on 0.2.4.7-alpha.
- Our default TLS ecdhe groups were backwards: we meant to be using
P224 for relays (for performance win) and P256 for bridges (since
it is more common in the wild). Instead we had it backwards. After
reconsideration, we decided that the default should be P256 on all
hosts, since its security is probably better, and since P224 is
reportedly used quite little in the wild. Found by "skruffy" on
IRC. Fix for bug 9780; bugfix on 0.2.4.8-alpha.
- Free directory authority certificate download statuses on exit
rather than leaking them. Fixes bug 9644; bugfix on 0.2.4.13-alpha.
o Minor bugfixes (on 0.2.3.x and earlier):
- If the guard we choose first doesn't answer, we would try the
second guard, but once we connected to the second guard we would
abandon it and retry the first one, slowing down bootstrapping.
The fix is to treat all our initially chosen guards as acceptable
to use. Fixes bug 9946; bugfix on 0.1.1.11-alpha.
- Fix an assertion failure that would occur when disabling the
ORPort setting on a running Tor process while accounting was
enabled. Fixes bug 6979; bugfix on 0.2.2.18-alpha.
- When examining the list of network interfaces to find our address,
do not consider non-running or disabled network interfaces. Fixes
bug 9904; bugfix on 0.2.3.11-alpha. Patch from "hantwister".
- Avoid an off-by-one error when checking buffer boundaries when
formatting the exit status of a pluggable transport helper.
This is probably not an exploitable bug, but better safe than
sorry. Fixes bug 9928; bugfix on 0.2.3.18-rc. Bug found by
Pedro Ribeiro.
o Minor features (protecting client timestamps):
- Clients no longer send timestamps in their NETINFO cells. These were
not used for anything, and they provided one small way for clients
to be distinguished from each other as they moved from network to
network or behind NAT. Implements part of proposal 222.
- Clients now round timestamps in INTRODUCE cells down to the nearest
10 minutes. If a new Support022HiddenServices option is set to 0, or
if it's set to "auto" and the feature is disabled in the consensus,
the timestamp is sent as 0 instead. Implements part of proposal 222.
- Stop sending timestamps in AUTHENTICATE cells. This is not such
a big deal from a security point of view, but it achieves no actual
good purpose, and isn't needed. Implements part of proposal 222.
- Reduce down accuracy of timestamps in hidden service descriptors.
Implements part of proposal 222.
o Minor features (other):
- Improve the circuit queue out-of-memory handler. Previously, when
we ran low on memory, we'd close whichever circuits had the most
queued cells. Now, we close those that have the *oldest* queued
cells, on the theory that those are most responsible for us
running low on memory. Based on analysis from a forthcoming paper
by Jansen, Tschorsch, Johnson, and Scheuermann. Fixes bug 9093.
- Generate bootstrapping status update events correctly when fetching
microdescriptors. Fixes bug 9927.
- Update to the October 2 2013 Maxmind GeoLite Country database.
o Documentation fixes:
- Clarify the usage and risks of setting the ContactInfo torrc line
for your relay or bridge. Resolves ticket 9854.
- Add anchors to the manpage so we can link to the html version of
the documentation for specific options. Resolves ticket 9866.
- Replace remaining references to DirServer in man page and
log entries. Resolves ticket 10124.
Changes in version 0.2.5.1-alpha - 2013-10-02
Tor 0.2.5.1-alpha introduces experimental support for syscall sandboxing
on Linux, allows bridges that offer pluggable transports to report usage
statistics, fixes many issues to make testing easier, and provides
a pile of minor features and bugfixes that have been waiting for a
release of the new branch.
This is the first alpha release in a new series, so expect there to
be bugs. Users who would rather test out a more stable branch should
stay with 0.2.4.x for now.
o Major features (security):
- Use the seccomp2 syscall filtering facility on Linux to limit
which system calls Tor can invoke. This is an experimental,
Linux-only feature to provide defense-in-depth against unknown
attacks. To try turning it on, set "Sandbox 1" in your torrc
file. Please be ready to report bugs. We hope to add support
for better sandboxing in the future, including more fine-grained
filters, better division of responsibility, and support for more
platforms. This work has been done by Cristian-Matei Toader for
Google Summer of Code.
- Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
renegotiation from working with TLS 1.1 or 1.2, so we had disabled
them to solve bug 6033.)
o Major features (other):
- Add support for passing arguments to managed pluggable transport
proxies. Implements ticket 3594.
- Bridges now track GeoIP information and the number of their users
even when pluggable transports are in use, and report usage
statistics in their extra-info descriptors. Resolves tickets 4773
and 5040.
- Make testing Tor networks bootstrap better: lower directory fetch
retry schedules and maximum interval without directory requests,
and raise maximum download tries. Implements ticket 6752.
- Add make target 'test-network' to run tests on a Chutney network.
Implements ticket 8530.
- The ntor handshake is now on-by-default, no matter what the
directory authorities recommend. Implements ticket 8561.
o Major bugfixes:
- Instead of writing destroy cells directly to outgoing connection
buffers, queue them and intersperse them with other outgoing cells.
This can prevent a set of resource starvation conditions where too
many pending destroy cells prevent data cells from actually getting
delivered. Reported by "oftc_must_be_destroyed". Fixes bug 7912;
bugfix on 0.2.0.1-alpha.
- If we are unable to save a microdescriptor to the journal, do not
drop it from memory and then reattempt downloading it. Fixes bug
9645; bugfix on 0.2.2.6-alpha.
- The new channel code sometimes lost track of in-progress circuits,
causing long-running clients to stop building new circuits. The
fix is to always call circuit_n_chan_done(chan, 0) from
channel_closed(). Fixes bug 9776; bugfix on 0.2.4.17-rc.
o Build features:
- Tor now builds each source file in two modes: a mode that avoids
exposing identifiers needlessly, and another mode that exposes
more identifiers for testing. This lets the compiler do better at
optimizing the production code, while enabling us to take more
radical measures to let the unit tests test things.
- The production builds no longer include functions used only in
the unit tests; all functions exposed from a module only for
unit-testing are now static in production builds.
- Add an --enable-coverage configuration option to make the unit
tests (and a new src/or/tor-cov target) to build with gcov test
coverage support.
o Testing:
- We now have rudimentary function mocking support that our unit
tests can use to test functions in isolation. Function mocking
lets the tests temporarily replace a function's dependencies with
stub functions, so that the tests can check the function without
invoking the other functions it calls.
- Add more unit tests for the <circid,channel>->circuit map, and
the destroy-cell-tracking code to fix bug 7912.
- Unit tests for failing cases of the TAP onion handshake.
- More unit tests for address-manipulation functions.
o Minor features (protecting client timestamps):
- Clients no longer send timestamps in their NETINFO cells. These were
not used for anything, and they provided one small way for clients
to be distinguished from each other as they moved from network to
network or behind NAT. Implements part of proposal 222.
- Clients now round timestamps in INTRODUCE cells down to the nearest
10 minutes. If a new Support022HiddenServices option is set to 0, or
if it's set to "auto" and the feature is disabled in the consensus,
the timestamp is sent as 0 instead. Implements part of proposal 222.
- Stop sending timestamps in AUTHENTICATE cells. This is not such
a big deal from a security point of view, but it achieves no actual
good purpose, and isn't needed. Implements part of proposal 222.
- Reduce down accuracy of timestamps in hidden service descriptors.
Implements part of proposal 222.
o Minor features (config options):
- Config (torrc) lines now handle fingerprints which are missing
their initial '$'. Resolves ticket 4341; improvement over 0.0.9pre5.
- Support a --dump-config option to print some or all of the
configured options. Mainly useful for debugging the command-line
option parsing code. Helps resolve ticket 4647.
- Raise awareness of safer logging: notify user of potentially
unsafe config options, like logging more verbosely than severity
"notice" or setting SafeLogging to 0. Resolves ticket 5584.
- Add a new configuration option TestingV3AuthVotingStartOffset
that bootstraps a network faster by changing the timing for
consensus votes. Addresses ticket 8532.
- Add a new torrc option "ServerTransportOptions" that allows
bridge operators to pass configuration parameters to their
pluggable transports. Resolves ticket 8929.
- The config (torrc) file now accepts bandwidth and space limits in
bits as well as bytes. (Anywhere that you can say "2 Kilobytes",
you can now say "16 kilobits", and so on.) Resolves ticket 9214.
Patch by CharlieB.
o Minor features (build):
- Add support for `--library-versions` flag. Implements ticket 6384.
- Return the "unexpected sendme" warnings to a warn severity, but make
them rate limited, to help diagnose ticket 8093.
- Detect a missing asciidoc, and warn the user about it, during
configure rather than at build time. Fixes issue 6506. Patch from
Arlo Breault.
o Minor features (other):
- Use the SOCK_NONBLOCK socket type, if supported, to open nonblocking
sockets in a single system call. Implements ticket 5129.
- Log current accounting state (bytes sent and received + remaining
time for the current accounting period) in the relay's heartbeat
message. Implements ticket 5526; patch from Peter Retzlaff.
- Implement the TRANSPORT_LAUNCHED control port event that
notifies controllers about new launched pluggable
transports. Resolves ticket 5609.
- If we're using the pure-C 32-bit curve25519_donna implementation
of curve25519, build it with the -fomit-frame-pointer option to
make it go faster on register-starved hosts. This improves our
handshake performance by about 6% on i386 hosts without nacl.
Closes ticket 8109.
- Update to the September 4 2013 Maxmind GeoLite Country database.
o Minor bugfixes:
- Set the listen() backlog limit to the largest actually supported
on the system, not to the value in a header file. Fixes bug 9716;
bugfix on every released Tor.
- No longer accept malformed http headers when parsing urls from
headers. Now we reply with Bad Request ("400"). Fixes bug 2767;
bugfix on 0.0.6pre1.
- In munge_extrainfo_into_routerinfo(), check the return value of
memchr(). This would have been a serious issue if we ever passed
it a non-extrainfo. Fixes bug 8791; bugfix on 0.2.0.6-alpha. Patch
from Arlo Breault.
- On the chance that somebody manages to build Tor on a
platform where time_t is unsigned, correct the way that
microdesc_add_to_cache() handles negative time arguments.
Fixes bug 8042; bugfix on 0.2.3.1-alpha.
- Reject relative control socket paths and emit a warning. Previously,
single-component control socket paths would be rejected, but Tor
would not log why it could not validate the config. Fixes bug 9258;
bugfix on 0.2.3.16-alpha.
o Minor bugfixes (command line):
- Use a single command-line parser for parsing torrc options on the
command line and for finding special command-line options to avoid
inconsistent behavior for torrc option arguments that have the same
names as command-line options. Fixes bugs 4647 and 9578; bugfix on
0.0.9pre5.
- No longer allow 'tor --hash-password' with no arguments. Fixes bug
9573; bugfix on 0.0.9pre5.
o Minor fixes (build, auxiliary programs):
- Stop preprocessing the "torify" script with autoconf, since
it no longer refers to LOCALSTATEDIR. Fixes bug 5505; patch
from Guilhem.
- The tor-fw-helper program now follows the standard convention and
exits with status code "0" on success. Fixes bug 9030; bugfix on
0.2.3.1-alpha. Patch by Arlo Breault.
- Corrected ./configure advice for what openssl dev package you should
install on Debian. Fixes bug 9207; bugfix on 0.2.0.1-alpha.
o Minor code improvements:
- Remove constants and tests for PKCS1 padding; it's insecure and
shouldn't be used for anything new. Fixes bug 8792; patch
from Arlo Breault.
- Remove instances of strcpy() from the unit tests. They weren't
hurting anything, since they were only in the unit tests, but it's
embarrassing to have strcpy() in the code at all, and some analysis
tools don't like it. Fixes bug 8790; bugfix on 0.2.3.6-alpha and
0.2.3.8-alpha. Patch from Arlo Breault.
o Removed features:
- Remove migration code from when we renamed the "cached-routers"
file to "cached-descriptors" back in 0.2.0.8-alpha. This
incidentally resolves ticket 6502 by cleaning up the related code
a bit. Patch from Akshay Hebbar.
o Code simplification and refactoring:
- Extract the common duplicated code for creating a subdirectory
of the data directory and writing to a file in it. Fixes ticket
4282; patch from Peter Retzlaff.
- Since OpenSSL 0.9.7, the i2d_*() functions support allocating output
buffer. Avoid calling twice: i2d_RSAPublicKey(), i2d_DHparams(),
i2d_X509(), and i2d_PublicKey(). Resolves ticket 5170.
- Add a set of accessor functions for the circuit timeout data
structure. Fixes ticket 6153; patch from "piet".
- Clean up exit paths from connection_listener_new(). Closes ticket
8789. Patch from Arlo Breault.
- Since we rely on OpenSSL 0.9.8 now, we can use EVP_PKEY_cmp()
and drop our own custom pkey_eq() implementation. Fixes bug 9043.
- Use a doubly-linked list to implement the global circuit list.
Resolves ticket 9108. Patch from Marek Majkowski.
- Remove contrib/id_to_fp.c since it wasn't used anywhere.
Changes in version 0.2.4.17-rc - 2013-09-05
Tor 0.2.4.17-rc is the third release candidate for the Tor 0.2.4.x
series. It adds an emergency step to help us tolerate the massive
influx of users: 0.2.4 clients using the new (faster and safer) "NTor"
circuit-level handshakes now effectively jump the queue compared to
the 0.2.3 clients using "TAP" handshakes. This release also fixes a
big bug hindering bridge reachability tests.
o Major features:
- Relays now process the new "NTor" circuit-level handshake requests
with higher priority than the old "TAP" circuit-level handshake
requests. We still process some TAP requests to not totally starve
0.2.3 clients when NTor becomes popular. A new consensus parameter
"NumNTorsPerTAP" lets us tune the balance later if we need to.
Implements ticket 9574.
o Major bugfixes:
- If the circuit build timeout logic is disabled (via the consensus,
or because we are an authority), then don't build testing circuits.
Fixes bug 9657; bugfix on 0.2.2.14-alpha.
- Bridges now send AUTH_CHALLENGE cells during their v3 handshakes;
previously they did not, which prevented them from receiving
successful connections from relays for self-test or bandwidth
testing. Also, when a relay is extending a circuit to a bridge,
it needs to send a NETINFO cell, even when the bridge hasn't sent
an AUTH_CHALLENGE cell. Fixes bug 9546; bugfix on 0.2.3.6-alpha.
- If the time to download the next old-style networkstatus is in
the future, do not decline to consider whether to download the
next microdescriptor networkstatus. Fixes bug 9564; bugfix on
0.2.3.14-alpha.
o Minor bugfixes:
- Avoid double-closing the listener socket in our socketpair()
replacement (used on Windows) in the case where the addresses on
our opened sockets don't match what we expected. Fixes bug 9400;
bugfix on 0.0.2pre7. Found by Coverity.
o Minor fixes (config options):
- Avoid overflows when the user sets MaxCircuitDirtiness to a
ridiculously high value, by imposing a (ridiculously high) 30-day
maximum on MaxCircuitDirtiness.
- Fix the documentation of HeartbeatPeriod to say that the heartbeat
message is logged at notice, not at info.
- Warn and fail if a server is configured not to advertise any
ORPorts at all. (We need *something* to put in our descriptor,
or we just won't work.)
o Minor features:
- Track how many "TAP" and "NTor" circuit handshake requests we get,
and how many we complete, and log it every hour to help relay
operators follow trends in network load. Addresses ticket 9658.
- Update to the August 7 2013 Maxmind GeoLite Country database.
Changes in version 0.2.4.16-rc - 2013-08-10
Tor 0.2.4.16-rc is the second release candidate for the Tor 0.2.4.x
series. It fixes several crash bugs in the 0.2.4 branch.
o Major bugfixes:
- Fix a bug in the voting algorithm that could yield incorrect results
when a non-naming authority declared too many flags. Fixes bug 9200;
bugfix on 0.2.0.3-alpha.
- Fix an uninitialized read that could in some cases lead to a remote
crash while parsing INTRODUCE2 cells. Bugfix on 0.2.4.1-alpha.
Anybody running a hidden service on the experimental 0.2.4.x
branch should upgrade. (This is, so far as we know, unrelated to
the recent news.)
- Avoid an assertion failure when processing DNS replies without the
answer types we expected. Fixes bug 9337; bugfix on 0.2.4.7-alpha.
- Avoid a crash when using --hash-password. Fixes bug 9295; bugfix on
0.2.4.15-rc. Found by stem integration tests.
o Minor bugfixes:
- Fix an invalid memory read that occurred when a pluggable
transport proxy failed its configuration protocol.
Fixes bug 9288; bugfix on 0.2.4.1-alpha.
- When evaluating whether to use a connection that we haven't
decided is canonical using a recent link protocol version,
decide that it's canonical only if it used address _does_
match the desired address. Fixes bug 9309; bugfix on
0.2.4.4-alpha. Reported by skruffy.
- Make the default behavior of NumDirectoryGuards be to track
NumEntryGuards. Now a user who changes only NumEntryGuards will get
the behavior she expects. Fixes bug 9354; bugfix on 0.2.4.8-alpha.
- Fix a spurious compilation warning with some older versions of
GCC on FreeBSD. Fixes bug 9254; bugfix on 0.2.4.14-alpha.
o Minor features:
- Update to the July 3 2013 Maxmind GeoLite Country database.
Changes in version 0.2.4.15-rc - 2013-07-01
Tor 0.2.4.15-rc is the first release candidate for the Tor 0.2.4.x
series. It fixes a few smaller bugs, but generally appears stable.
Please test it and let us know whether it is!
o Major bugfixes:
- When receiving a new configuration file via the control port's
LOADCONF command, do not treat the defaults file as absent.
Fixes bug 9122; bugfix on 0.2.3.9-alpha.
o Minor features:
- Issue a warning when running with the bufferevents backend enabled.
It's still not stable, and people should know that they're likely
to hit unexpected problems. Closes ticket 9147.
Changes in version 0.2.4.14-alpha - 2013-06-18
Tor 0.2.4.14-alpha fixes a pair of client guard enumeration problems
present in 0.2.4.13-alpha.
o Major bugfixes:
- When we have too much memory queued in circuits (according to a new
MaxMemInCellQueues option), close the circuits consuming the most
memory. This prevents us from running out of memory as a relay if
circuits fill up faster than they can be drained. Fixes bug 9063;
bugfix on the 54th commit of Tor. This bug is a further fix beyond
bug 6252, whose fix was merged into 0.2.3.21-rc.
This change also fixes an earlier approach taken in 0.2.4.13-alpha,
where we tried to solve this issue simply by imposing an upper limit
on the number of queued cells for a single circuit. That approach
proved to be problematic, since there are ways to provoke clients to
send a number of cells in excess of any such reasonable limit. Fixes
bug 9072; bugfix on 0.2.4.13-alpha.
- Limit hidden service descriptors to at most ten introduction
points, to slow one kind of guard enumeration. Fixes bug 9002;
bugfix on 0.1.1.11-alpha.
Changes in version 0.2.4.13-alpha - 2013-06-14
Tor 0.2.4.13-alpha fixes a variety of potential remote crash
vulnerabilities, makes socks5 username/password circuit isolation
actually actually work (this time for sure!), and cleans up a bunch
of other issues in preparation for a release candidate.
o Major bugfixes (robustness):
- Close any circuit that has too many cells queued on it. Fixes
bug 9063; bugfix on the 54th commit of Tor. This bug is a further
fix beyond bug 6252, whose fix was merged into 0.2.3.21-rc.
- Prevent the get_freelists() function from running off the end of
the list of freelists if it somehow gets an unrecognized
allocation. Fixes bug 8844; bugfix on 0.2.0.16-alpha. Reported by
eugenis.
- Avoid an assertion failure on OpenBSD (and perhaps other BSDs)
when an exit connection with optimistic data succeeds immediately
rather than returning EINPROGRESS. Fixes bug 9017; bugfix on
0.2.3.1-alpha.
- Fix a directory authority crash bug when building a consensus
using an older consensus as its basis. Fixes bug 8833. Bugfix
on 0.2.4.12-alpha.
o Major bugfixes:
- Avoid a memory leak where we would leak a consensus body when we
find that a consensus which we couldn't previously verify due to
missing certificates is now verifiable. Fixes bug 8719; bugfix
on 0.2.0.10-alpha.
- We used to always request authority certificates by identity digest,
meaning we'd get the newest one even when we wanted one with a
different signing key. Then we would complain about being given
a certificate we already had, and never get the one we really
wanted. Now we use the "fp-sk/" resource as well as the "fp/"
resource to request the one we want. Fixes bug 5595; bugfix on
0.2.0.8-alpha.
- Follow the socks5 protocol when offering username/password
authentication. The fix for bug 8117 exposed this bug, and it
turns out real-world applications like Pidgin do care. Bugfix on
0.2.3.2-alpha; fixes bug 8879.
- Prevent failures on Windows Vista and later when rebuilding the
microdescriptor cache. Diagnosed by Robert Ransom. Fixes bug 8822;
bugfix on 0.2.4.12-alpha.
o Minor bugfixes:
- Fix an impossible buffer overrun in the AES unit tests. Fixes
bug 8845; bugfix on 0.2.0.7-alpha. Found by eugenis.
- If for some reason we fail to write a microdescriptor while
rebuilding the cache, do not let the annotations from that
microdescriptor linger in the cache file, and do not let the
microdescriptor stay recorded as present in its old location.
Fixes bug 9047; bugfix on 0.2.2.6-alpha.
- Fix a memory leak that would occur whenever a configuration
option changed. Fixes bug 8718; bugfix on 0.2.3.3-alpha.
- Paste the description for PathBias parameters from the man
page into or.h, so the code documents them too. Fixes bug 7982;
bugfix on 0.2.3.17-beta and 0.2.4.8-alpha.
- Relays now treat a changed IPv6 ORPort as sufficient reason to
publish an updated descriptor. Fixes bug 6026; bugfix on
0.2.4.1-alpha.
- When launching a resolve request on behalf of an AF_UNIX control
socket, omit the address field of the new entry connection, used in
subsequent controller events, rather than letting tor_dup_addr()
set it to "<unknown address type>". Fixes bug 8639; bugfix on
0.2.4.12-alpha.
o Minor bugfixes (log messages):
- Fix a scaling issue in the path bias accounting code that
resulted in "Bug:" log messages from either
pathbias_scale_close_rates() or pathbias_count_build_success().
This represents a bugfix on a previous bugfix: the original fix
attempted in 0.2.4.10-alpha was incomplete. Fixes bug 8235; bugfix
on 0.2.4.1-alpha.
- Give a less useless error message when the user asks for an IPv4
address on an IPv6-only port, or vice versa. Fixes bug 8846; bugfix
on 0.2.4.7-alpha.
o Minor features:
- Downgrade "unexpected SENDME" warnings to protocol-warn for 0.2.4.x,
to tolerate bug 8093 for now.
- Add an "ignoring-advertised-bws" boolean to the flag-threshold lines
in directory authority votes to describe whether they have enough
measured bandwidths to ignore advertised (relay descriptor)
bandwidth claims. Resolves ticket 8711.
- Update to the June 5 2013 Maxmind GeoLite Country database.
o Removed documentation:
- Remove some of the older contents of doc/ as obsolete; move others
to torspec.git. Fixes bug 8965.
o Code simplification and refactoring:
- Avoid using character buffers when constructing most directory
objects: this approach was unwieldy and error-prone. Instead,
build smartlists of strings, and concatenate them when done.
Changes in version 0.2.4.12-alpha - 2013-04-18
Tor 0.2.4.12-alpha moves Tor forward on several fronts: it starts the
process for lengthening the guard rotation period, makes directory
authority opinions in the consensus a bit less gameable, makes socks5
username/password circuit isolation actually work, and fixes a wide
variety of other issues.
o Major features:
- Raise the default time that a client keeps an entry guard from
"1-2 months" to "2-3 months", as suggested by Tariq Elahi's WPES
2012 paper. (We would make it even longer, but we need better client
load balancing first.) Also, make the guard lifetime controllable
via a new GuardLifetime torrc option and a GuardLifetime consensus
parameter. Start of a fix for bug 8240; bugfix on 0.1.1.11-alpha.
- Directory authorities now prefer using measured bandwidths to
advertised ones when computing flags and thresholds. Resolves
ticket 8273.
- Directory authorities that have more than a threshold number
of relays with measured bandwidths now treat relays with unmeasured
bandwidths as having bandwidth 0. Resolves ticket 8435.
o Major bugfixes (assert / resource use):
- Avoid a bug where our response to TLS renegotiation under certain
network conditions could lead to a busy-loop, with 100% CPU
consumption. Fixes bug 5650; bugfix on 0.2.0.16-alpha.
- Avoid an assertion when we discover that we'd like to write a cell
onto a closing connection: just discard the cell. Fixes another
case of bug 7350; bugfix on 0.2.4.4-alpha.
o Major bugfixes (client-side privacy):
- When we mark a circuit as unusable for new circuits, have it
continue to be unusable for new circuits even if MaxCircuitDirtiness
is increased too much at the wrong time, or the system clock jumps
backwards. Fixes bug 6174; bugfix on 0.0.2pre26.
- If ClientDNSRejectInternalAddresses ("do not believe DNS queries
which have resolved to internal addresses") is set, apply that
rule to IPv6 as well. Fixes bug 8475; bugfix on 0.2.0.7-alpha.
- When an exit relay rejects a stream with reason "exit policy", but
we only know an exit policy summary (e.g. from the microdesc
consensus) for it, do not mark the relay as useless for all exiting.
Instead, mark just the circuit as unsuitable for that particular
address. Fixes part of bug 7582; bugfix on 0.2.3.2-alpha.
- Allow applications to get proper stream isolation with
IsolateSOCKSAuth. Many SOCKS5 clients that want to offer
username/password authentication also offer "no authentication". Tor
had previously preferred "no authentication", so the applications
never actually sent Tor their auth details. Now Tor selects
username/password authentication if it's offered. You can disable
this behavior on a per-SOCKSPort basis via PreferSOCKSNoAuth. Fixes
bug 8117; bugfix on 0.2.3.3-alpha.
o Major bugfixes (other):
- When unable to find any working directory nodes to use as a
directory guard, give up rather than adding the same non-working
nodes to the directory guard list over and over. Fixes bug 8231;
bugfix on 0.2.4.8-alpha.
o Minor features:
- Reject as invalid most directory objects containing a NUL.
Belt-and-suspender fix for bug 8037.
- In our testsuite, create temporary directories with a bit more
entropy in their name to make name collisions less likely. Fixes
bug 8638.
- Add CACHED keyword to ADDRMAP events in the control protocol
to indicate whether a DNS result will be cached or not. Resolves
ticket 8596.
- Update to the April 3 2013 Maxmind GeoLite Country database.
o Minor features (build):
- Detect and reject attempts to build Tor with threading support
when OpenSSL has been compiled without threading support.
Fixes bug 6673.
- Clarify that when autoconf is checking for nacl, it is checking
specifically for nacl with a fast curve25519 implementation.
Fixes bug 8014.
- Warn if building on a platform with an unsigned time_t: there
are too many places where Tor currently assumes that time_t can
hold negative values. We'd like to fix them all, but probably
some will remain.
o Minor bugfixes (build):
- Fix some bugs in tor-fw-helper-natpmp when trying to build and
run it on Windows. More bugs likely remain. Patch from Gisle Vanem.
Fixes bug 7280; bugfix on 0.2.3.1-alpha.
- Add the old src/or/micro-revision.i filename to CLEANFILES.
On the off chance that somebody has one, it will go away as soon
as they run "make clean". Fix for bug 7143; bugfix on 0.2.4.1-alpha.
- Build Tor correctly on 32-bit platforms where the compiler can build
but not run code using the "uint128_t" construction. Fixes bug 8587;
bugfix on 0.2.4.8-alpha.
- Fix compilation warning with some versions of clang that would
prefer the -Wswitch-enum compiler flag to warn about switch
statements with missing enum values, even if those switch
statements have a "default:" statement. Fixes bug 8598; bugfix
on 0.2.4.10-alpha.
o Minor bugfixes (protocol):
- Fix the handling of a TRUNCATE cell when it arrives while the
circuit extension is in progress. Fixes bug 7947; bugfix on 0.0.7.1.
- Fix a misframing issue when reading the version numbers in a
VERSIONS cell. Previously we would recognize [00 01 00 02] as
'version 1, version 2, and version 0x100', when it should have
only included versions 1 and 2. Fixes bug 8059; bugfix on
0.2.0.10-alpha. Reported pseudonymously.
- Make the format and order of STREAM events for DNS lookups
consistent among the various ways to launch DNS lookups. Fixes
bug 8203; bugfix on 0.2.0.24-rc. Patch by "Desoxy".
- Correct our check for which versions of Tor support the EXTEND2
cell. We had been willing to send it to Tor 0.2.4.7-alpha and
later, when support was really added in version 0.2.4.8-alpha.
Fixes bug 8464; bugfix on 0.2.4.8-alpha.
o Minor bugfixes (other):
- Correctly store microdescriptors and extrainfo descriptors with
an internal NUL byte. Fixes bug 8037; bugfix on 0.2.0.1-alpha.
Bug reported by "cypherpunks".
- Increase the width of the field used to remember a connection's
link protocol version to two bytes. Harmless for now, since the
only currently recognized versions are one byte long. Reported
pseudonymously. Fixes bug 8062; bugfix on 0.2.0.10-alpha.
- If the state file's path bias counts are invalid (presumably from a
buggy Tor prior to 0.2.4.10-alpha), make them correct. Also add
additional checks and log messages to the scaling of Path Bias
counts, in case there still are remaining issues with scaling.
Should help resolve bug 8235.
- Eliminate several instances where we use "Nickname=ID" to refer to
nodes in logs. Use "Nickname (ID)" instead. (Elsewhere, we still use
"$ID=Nickname", which is also acceptable.) Fixes bug 7065. Bugfix
on 0.2.3.21-rc, 0.2.4.5-alpha, 0.2.4.8-alpha, and 0.2.4.10-alpha.
o Minor bugfixes (syscalls):
- Always check the return values of functions fcntl() and
setsockopt(). We don't believe these are ever actually failing in
practice, but better safe than sorry. Also, checking these return
values should please analysis tools like Coverity. Patch from
'flupzor'. Fixes bug 8206; bugfix on all versions of Tor.
- Use direct writes rather than stdio when building microdescriptor
caches, in an attempt to mitigate bug 8031, or at least make it
less common.
o Minor bugfixes (config):
- When rejecting a configuration because we were unable to parse a
quoted string, log an actual error message. Fixes bug 7950; bugfix
on 0.2.0.16-alpha.
- Behave correctly when the user disables LearnCircuitBuildTimeout
but doesn't tell us what they would like the timeout to be. Fixes
bug 6304; bugfix on 0.2.2.14-alpha.
- When autodetecting the number of CPUs, use the number of available
CPUs in preference to the number of configured CPUs. Inform the
user if this reduces the number of available CPUs. Fixes bug 8002;
bugfix on 0.2.3.1-alpha.
- Make it an error when you set EntryNodes but disable UseGuardNodes,
since it will (surprisingly to some users) ignore EntryNodes. Fixes
bug 8180; bugfix on 0.2.3.11-alpha.
- Allow TestingTorNetworks to override the 4096-byte minimum for
the Fast threshold. Otherwise they can't bootstrap until they've
observed more traffic. Fixes bug 8508; bugfix on 0.2.4.10-alpha.
- Fix some logic errors when the user manually overrides the
PathsNeededToBuildCircuits option in torrc. Fixes bug 8599; bugfix
on 0.2.4.10-alpha.
o Minor bugfixes (log messages to help diagnose bugs):
- If we fail to free a microdescriptor because of bug 7164, log
the filename and line number from which we tried to free it.
- Add another diagnostic to the heartbeat message: track and log
overhead that TLS is adding to the data we write. If this is
high, we are sending too little data to SSL_write at a time.
Diagnostic for bug 7707.
- Add more detail to a log message about relaxed timeouts, to help
track bug 7799.
- Warn more aggressively when flushing microdescriptors to a
microdescriptor cache fails, in an attempt to mitigate bug 8031,
or at least make it more diagnosable.
- Improve debugging output to help track down bug 8185 ("Bug:
outgoing relay cell has n_chan==NULL. Dropping.")
- Log the purpose of a path-bias testing circuit correctly.
Improves a log message from bug 8477; bugfix on 0.2.4.8-alpha.
o Minor bugfixes (0.2.4.x log messages that were too noisy):
- Don't attempt to relax the timeout of already opened 1-hop circuits.
They might never timeout. This should eliminate some/all cases of
the relaxed timeout log message.
- Use circuit creation time for network liveness evaluation. This
should eliminate warning log messages about liveness caused
by changes in timeout evaluation. Fixes bug 6572; bugfix on
0.2.4.8-alpha.
- Reduce a path bias length check from notice to info. The message
is triggered when creating controller circuits. Fixes bug 8196;
bugfix on 0.2.4.8-alpha.
- Fix a path state issue that triggered a notice during relay startup.
Fixes bug 8320; bugfix on 0.2.4.10-alpha.
- Reduce occurrences of warns about circuit purpose in
connection_ap_expire_building(). Fixes bug 8477; bugfix on
0.2.4.11-alpha.
o Minor bugfixes (pre-0.2.4.x log messages that were too noisy):
- If we encounter a write failure on a SOCKS connection before we
finish our SOCKS handshake, don't warn that we closed the
connection before we could send a SOCKS reply. Fixes bug 8427;
bugfix on 0.1.0.1-rc.
- Correctly recognize that [::1] is a loopback address. Fixes
bug 8377; bugfix on 0.2.1.3-alpha.
- Fix a directory authority warn caused when we have a large amount
of badexit bandwidth. Fixes bug 8419; bugfix on 0.2.2.10-alpha.
- Don't log inappropriate heartbeat messages when hibernating: a
hibernating node is _expected_ to drop out of the consensus,
decide it isn't bootstrapped, and so forth. Fixes bug 7302;
bugfix on 0.2.3.1-alpha.
- Don't complain about bootstrapping problems while hibernating.
These complaints reflect a general code problem, but not one
with any problematic effects (no connections are actually
opened). Fixes part of bug 7302; bugfix on 0.2.3.2-alpha.
o Documentation fixes:
- Update tor-fw-helper.1.txt and tor-fw-helper.c to make option
names match. Fixes bug 7768.
- Make the torify manpage no longer refer to tsocks; torify hasn't
supported tsocks since 0.2.3.14-alpha.
- Make the tor manpage no longer reference tsocks.
- Fix the GeoIPExcludeUnknown documentation to refer to
ExcludeExitNodes rather than the currently nonexistent
ExcludeEntryNodes. Spotted by "hamahangi" on tor-talk.
o Removed files:
- The tor-tsocks.conf is no longer distributed or installed. We
recommend that tsocks users use torsocks instead. Resolves
ticket 8290.
Changes in version 0.2.4.11-alpha - 2013-03-11
Tor 0.2.4.11-alpha makes relay measurement by directory authorities
more robust, makes hidden service authentication work again, and
resolves a DPI fingerprint for Tor's SSL transport.
o Major features (directory authorities):
- Directory authorities now support a new consensus method (17)
where they cap the published bandwidth of servers for which
insufficient bandwidth measurements exist. Fixes part of bug 2286.
- Directory authorities that set "DisableV2DirectoryInfo_ 1" no longer
serve any v2 directory information. Now we can test disabling the
old deprecated v2 directory format, and see whether doing so has
any effect on network load. Begins to fix bug 6783.
- Directory authorities now include inside each vote a statement of
the performance thresholds they used when assigning flags.
Implements ticket 8151.
o Major bugfixes (directory authorities):
- Stop marking every relay as having been down for one hour every
time we restart a directory authority. These artificial downtimes
were messing with our Stable and Guard flag calculations. Fixes
bug 8218 (introduced by the fix for 1035). Bugfix on 0.2.2.23-alpha.
o Major bugfixes (hidden services):
- Allow hidden service authentication to succeed again. When we
refactored the hidden service introduction code back
in 0.2.4.1-alpha, we didn't update the code that checks
whether authentication information is present, causing all
authentication checks to return "false". Fix for bug 8207; bugfix
on 0.2.4.1-alpha. Found by Coverity; this is CID 718615.
o Minor features (relays, bridges):
- Make bridge relays check once a minute for whether their IP
address has changed, rather than only every 15 minutes. Resolves
bugs 1913 and 1992.
- Refactor resolve_my_address() so it returns the method by which we
decided our public IP address (explicitly configured, resolved from
explicit hostname, guessed from interfaces, learned by gethostname).
Now we can provide more helpful log messages when a relay guesses
its IP address incorrectly (e.g. due to unexpected lines in
/etc/hosts). Resolves ticket 2267.
- Teach bridge-using clients to avoid 0.2.2 bridges when making
microdescriptor-related dir requests, and only fall back to normal
descriptors if none of their bridges can handle microdescriptors
(as opposed to the fix in ticket 4013, which caused them to fall
back to normal descriptors if *any* of their bridges preferred
them). Resolves ticket 4994.
- Randomize the lifetime of our SSL link certificate, so censors can't
use the static value for filtering Tor flows. Resolves ticket 8443;
related to ticket 4014 which was included in 0.2.2.33.
- Support a new version of the link protocol that allows 4-byte circuit
IDs. Previously, circuit IDs were limited to 2 bytes, which presented
a possible resource exhaustion issue. Closes ticket 7351; implements
proposal 214.
o Minor features (portability):
- Tweak the curve25519-donna*.c implementations to tolerate systems
that lack stdint.h. Fixes bug 3894; bugfix on 0.2.4.8-alpha.
- Use Ville Laurikari's implementation of AX_CHECK_SIGN() to determine
the signs of types during autoconf. This is better than our old
approach, which didn't work when cross-compiling.
- Detect the sign of enum values, rather than assuming that MSC is the
only compiler where enum types are all signed. Fixes bug 7727;
bugfix on 0.2.4.10-alpha.
o Minor features (other):
- Say "KBytes" rather than "KB" in the man page (for various values
of K), to further reduce confusion about whether Tor counts in
units of memory or fractions of units of memory. Resolves ticket 7054.
- Clear the high bit on curve25519 public keys before passing them to
our backend, in case we ever wind up using a backend that doesn't do
so itself. If we used such a backend, and *didn't* clear the high bit,
we could wind up in a situation where users with such backends would
be distinguishable from users without. Fixes bug 8121; bugfix on
0.2.4.8-alpha.
- Update to the March 6 2013 Maxmind GeoLite Country database.
o Minor bugfixes (clients):
- When we receive a RELAY_END cell with the reason DONE, or with no
reason, before receiving a RELAY_CONNECTED cell, report the SOCKS
status as "connection refused". Previously we reported these cases
as success but then immediately closed the connection. Fixes bug
7902; bugfix on 0.1.0.1-rc. Reported by "oftc_must_be_destroyed".
- Downgrade an assertion in connection_ap_expire_beginning to an
LD_BUG message. The fix for bug 8024 should prevent this message
from displaying, but just in case, a warn that we can diagnose
is better than more assert crashes. Fixes bug 8065; bugfix on
0.2.4.8-alpha.
- Lower path use bias thresholds to .80 for notice and .60 for warn.
Also make the rate limiting flags for the path use bias log messages
independent from the original path bias flags. Fixes bug 8161;
bugfix on 0.2.4.10-alpha.
o Minor bugfixes (relays):
- Stop trying to resolve our hostname so often (e.g. every time we
think about doing a directory fetch). Now we reuse the cached
answer in some cases. Fixes bugs 1992 (bugfix on 0.2.0.20-rc)
and 2410 (bugfix on 0.1.2.2-alpha).
- Stop sending a stray "(null)" in some cases for the server status
"EXTERNAL_ADDRESS" controller event. Resolves bug 8200; bugfix
on 0.1.2.6-alpha.
- When choosing which stream on a formerly stalled circuit to wake
first, make better use of the platform's weak RNG. Previously,
we had been using the % ("modulo") operator to try to generate a
1/N chance of picking each stream, but this behaves badly with
many platforms' choice of weak RNG. Fixes bug 7801; bugfix on
0.2.2.20-alpha.
- Use our own weak RNG when we need a weak RNG. Windows's rand() and
Irix's random() only return 15 bits; Solaris's random() returns more
bits but its RAND_MAX says it only returns 15, and so on. Motivated
by the fix for bug 7801; bugfix on 0.2.2.20-alpha.
o Minor bugfixes (directory authorities):
- Directory authorities now use less space when formatting identical
microdescriptor lines in directory votes. Fixes bug 8158; bugfix
on 0.2.4.1-alpha.
o Minor bugfixes (memory leaks spotted by Coverity -- bug 7816):
- Avoid leaking memory if we fail to compute a consensus signature
or we generate a consensus we can't parse. Bugfix on 0.2.0.5-alpha.
- Fix a memory leak when receiving headers from an HTTPS proxy. Bugfix
on 0.2.1.1-alpha.
- Fix a memory leak during safe-cookie controller authentication.
Bugfix on 0.2.3.13-alpha.
- Avoid memory leak of IPv6 policy content if we fail to format it into
a router descriptor. Bugfix on 0.2.4.7-alpha.
o Minor bugfixes (other code correctness issues):
- Avoid a crash if we fail to generate an extrainfo descriptor.
Fixes bug 8208; bugfix on 0.2.3.16-alpha. Found by Coverity;
this is CID 718634.
- When detecting the largest possible file descriptor (in order to
close all file descriptors when launching a new program), actually
use _SC_OPEN_MAX. The old code for doing this was very, very broken.
Fixes bug 8209; bugfix on 0.2.3.1-alpha. Found by Coverity; this
is CID 743383.
- Fix a copy-and-paste error when adding a missing A1 to a routerset
because of GeoIPExcludeUnknown. Fix for Coverity CID 980650.
Bugfix on 0.2.4.10-alpha.
- Fix an impossible-to-trigger integer overflow when estimating how
long our onionskin queue would take. (This overflow would require us
to accept 4 million onionskins before processing 100 of them.) Fixes
bug 8210; bugfix on 0.2.4.10-alpha.
o Code simplification and refactoring:
- Add a wrapper function for the common "log a message with a
rate-limit" case.
Changes in version 0.2.4.10-alpha - 2013-02-04
Tor 0.2.4.10-alpha adds defenses at the directory authority level from
certain attacks that flood the network with relays; changes the queue
for circuit create requests from a sized-based limit to a time-based
limit; resumes building with MSVC on Windows; and fixes a wide variety
of other issues.
o Major bugfixes (directory authority):
- When computing directory thresholds, ignore any rejected-as-sybil
nodes during the computation so that they can't influence Fast,
Guard, etc. (We should have done this for proposal 109.) Fixes
bug 8146.
- When marking a node as a likely sybil, reset its uptime metrics
to zero, so that it cannot time towards getting marked as Guard,
Stable, or HSDir. (We should have done this for proposal 109.) Fixes
bug 8147.
o Major bugfixes:
- When a TLS write is partially successful but incomplete, remember
that the flushed part has been flushed, and notice that bytes were
actually written. Reported and fixed pseudonymously. Fixes bug
7708; bugfix on Tor 0.1.0.5-rc.
- Reject bogus create and relay cells with 0 circuit ID or 0 stream
ID: these could be used to create unexpected streams and circuits
which would count as "present" to some parts of Tor but "absent"
to others, leading to zombie circuits and streams or to a bandwidth
denial-of-service. Fixes bug 7889; bugfix on every released version
of Tor. Reported by "oftc_must_be_destroyed".
- Rename all macros in our local copy of queue.h to begin with "TOR_".
This change seems the only good way to permanently prevent conflicts
with queue.h on various operating systems. Fixes bug 8107; bugfix
on 0.2.4.6-alpha.
o Major features (relay):
- Instead of limiting the number of queued onionskins (aka circuit
create requests) to a fixed, hard-to-configure number, we limit
the size of the queue based on how many we expect to be able to
process in a given amount of time. We estimate the time it will
take to process an onionskin based on average processing time
of previous onionskins. Closes ticket 7291. You'll never have to
configure MaxOnionsPending again.
o Major features (portability):
- Resume building correctly with MSVC and Makefile.nmake. This patch
resolves numerous bugs and fixes reported by ultramage, including
7305, 7308, 7309, 7310, 7312, 7313, 7315, 7316, and 7669.
- Make the ntor and curve25519 code build correctly with MSVC.
Fix on 0.2.4.8-alpha.
o Minor features:
- When directory authorities are computing thresholds for flags,
never let the threshold for the Fast flag fall below 4096
bytes. Also, do not consider nodes with extremely low bandwidths
when deciding thresholds for various directory flags. This change
should raise our threshold for Fast relays, possibly in turn
improving overall network performance; see ticket 1854. Resolves
ticket 8145.
- The Tor client now ignores sub-domain components of a .onion
address. This change makes HTTP "virtual" hosting
possible: http://foo.aaaaaaaaaaaaaaaa.onion/ and
http://bar.aaaaaaaaaaaaaaaa.onion/ can be two different websites
hosted on the same hidden service. Implements proposal 204.
- We compute the overhead from passing onionskins back and forth to
cpuworkers, and report it when dumping statistics in response to
SIGUSR1. Supports ticket 7291.
o Minor features (path selection):
- When deciding whether we have enough descriptors to build circuits,
instead of looking at raw relay counts, look at which fraction
of (bandwidth-weighted) paths we're able to build. This approach
keeps clients from building circuits if their paths are likely to
stand out statistically. The default fraction of paths needed is
taken from the consensus directory; you can override it with the
new PathsNeededToBuildCircuits option. Fixes ticket 5956.
- When any country code is listed in ExcludeNodes or ExcludeExitNodes,
and we have GeoIP information, also exclude all nodes with unknown
countries "??" and "A1". This behavior is controlled by the
new GeoIPExcludeUnknown option: you can make such nodes always
excluded with "GeoIPExcludeUnknown 1", and disable the feature
with "GeoIPExcludeUnknown 0". Setting "GeoIPExcludeUnknown auto"
gets you the default behavior. Implements feature 7706.
- Path Use Bias: Perform separate accounting for successful circuit
use. Keep separate statistics on stream attempt rates versus stream
success rates for each guard. Provide configurable thresholds to
determine when to emit log messages or disable use of guards that
fail too many stream attempts. Resolves ticket 7802.
o Minor features (log messages):
- When learning a fingerprint for a bridge, log its corresponding
transport type. Implements ticket 7896.
- Improve the log message when "Bug/attack: unexpected sendme cell
from client" occurs, to help us track bug 8093.
o Minor bugfixes:
- Remove a couple of extraneous semicolons that were upsetting the
cparser library. Patch by Christian Grothoff. Fixes bug 7115;
bugfix on 0.2.2.1-alpha.
- Remove a source of rounding error during path bias count scaling;
don't count cannibalized circuits as used for path bias until we
actually try to use them; and fix a circuit_package_relay_cell()
warning message about n_chan==NULL. Fixes bug 7802.
- Detect nacl when its headers are in a nacl/ subdirectory. Also,
actually link against nacl when we're configured to use it. Fixes
bug 7972; bugfix on 0.2.4.8-alpha.
- Compile correctly with the --disable-curve25519 option. Fixes
bug 8153; bugfix on 0.2.4.8-alpha.
o Build improvements:
- Do not report status verbosely from autogen.sh unless the -v flag
is specified. Fixes issue 4664. Patch from Onizuka.
- Replace all calls to snprintf() outside of src/ext with
tor_snprintf(). Also remove the #define to replace snprintf with
_snprintf on Windows; they have different semantics, and all of
our callers should be using tor_snprintf() anyway. Fixes bug 7304.
- Try to detect if we are ever building on a platform where
memset(...,0,...) does not set the value of a double to 0.0. Such
platforms are permitted by the C standard, though in practice
they're pretty rare (since IEEE 754 is nigh-ubiquitous). We don't
currently support them, but it's better to detect them and fail
than to perform erroneously.
o Removed features:
- Stop exporting estimates of v2 and v3 directory traffic shares
in extrainfo documents. They were unneeded and sometimes inaccurate.
Also stop exporting any v2 directory request statistics. Resolves
ticket 5823.
- Drop support for detecting and warning about versions of Libevent
before 1.3e. Nothing reasonable ships with them any longer;
warning the user about them shouldn't be needed. Resolves ticket
6826.
o Code simplifications and refactoring:
- Rename "isin" functions to "contains", for grammar. Resolves
ticket 5285.
- Rename Tor's logging function log() to tor_log(), to avoid conflicts
with the natural logarithm function from the system libm. Resolves
ticket 7599.
Changes in version 0.2.4.9-alpha - 2013-01-15
Tor 0.2.4.9-alpha provides a quick fix to make the new ntor handshake
work more robustly.
o Major bugfixes:
- Fix backward compatibility logic when receiving an embedded ntor
handshake tunneled in a CREATE cell. This clears up the "Bug:
couldn't format CREATED cell" warning. Fixes bug 7959; bugfix
on 0.2.4.8-alpha.
Changes in version 0.2.4.8-alpha - 2013-01-14
Tor 0.2.4.8-alpha introduces directory guards to reduce user enumeration
risks, adds a new stronger and faster circuit handshake, and offers
stronger and faster link encryption when both sides support it.
o Major features:
- Preliminary support for directory guards (proposal 207): when
possible, clients now use their entry guards for non-anonymous
directory requests. This can help prevent client enumeration. Note
that this behavior only works when we have a usable consensus
directory, and when options about what to download are more or less
standard. In the future we should re-bootstrap from our guards,
rather than re-bootstrapping from the preconfigured list of
directory sources that ships with Tor. Resolves ticket 6526.
- Tor relays and clients now support a better CREATE/EXTEND cell
format, allowing the sender to specify multiple address, identity,
and handshake types. Implements Robert Ransom's proposal 200;
closes ticket 7199.
o Major features (new circuit handshake):
- Tor now supports a new circuit extension handshake designed by Ian
Goldberg, Douglas Stebila, and Berkant Ustaoglu. Our original
circuit extension handshake, later called "TAP", was a bit slow
(especially on the relay side), had a fragile security proof, and
used weaker keys than we'd now prefer. The new circuit handshake
uses Dan Bernstein's "curve25519" elliptic-curve Diffie-Hellman
function, making it significantly more secure than the older
handshake, and significantly faster. Tor can use one of two built-in
pure-C curve25519-donna implementations by Adam Langley, or it
can link against the "nacl" library for a tuned version if present.
The built-in version is very fast for 64-bit systems when building
with GCC. The built-in 32-bit version is still faster than the
old TAP protocol, but using libnacl is better on most such hosts.
Clients don't currently use this protocol by default, since
comparatively few clients support it so far. To try it, set
UseNTorHandshake to 1.
Implements proposal 216; closes ticket 7202.
o Major features (better link encryption):
- Relays can now enable the ECDHE TLS ciphersuites when available
and appropriate. These ciphersuites let us negotiate forward-secure
TLS secret keys more safely and more efficiently than with our
previous use of Diffie-Hellman modulo a 1024-bit prime. By default,
public relays prefer the (faster) P224 group, and bridges prefer
the (more common) P256 group; you can override this with the
TLSECGroup option.
Enabling these ciphers was a little tricky, since for a long time,
clients had been claiming to support them without actually doing
so, in order to foil fingerprinting. But with the client-side
implementation of proposal 198 in 0.2.3.17-beta, clients can now
match the ciphers from recent Firefox versions *and* list the
ciphers they actually mean, so relays can believe such clients
when they advertise ECDHE support in their TLS ClientHello messages.
This feature requires clients running 0.2.3.17-beta or later,
and requires both sides to be running OpenSSL 1.0.0 or later
with ECC support. OpenSSL 1.0.1, with the compile-time option
"enable-ec_nistp_64_gcc_128", is highly recommended.
Implements the relay side of proposal 198; closes ticket 7200.
o Major bugfixes:
- Avoid crashing when, as a relay without IPv6-exit support, a
client insists on getting an IPv6 address or nothing. Fixes bug
7814; bugfix on 0.2.4.7-alpha.
o Minor features:
- Improve circuit build timeout handling for hidden services.
In particular: adjust build timeouts more accurately depending
upon the number of hop-RTTs that a particular circuit type
undergoes. Additionally, launch intro circuits in parallel
if they timeout, and take the first one to reply as valid.
- Work correctly on Unix systems where EAGAIN and EWOULDBLOCK are
separate error codes; or at least, don't break for that reason.
Fixes bug 7935. Reported by "oftc_must_be_destroyed".
- Update to the January 2 2013 Maxmind GeoLite Country database.
o Minor features (testing):
- Add benchmarks for DH (1024-bit multiplicative group) and ECDH
(P-256) Diffie-Hellman handshakes to src/or/bench.
- Add benchmark functions to test onion handshake performance.
o Minor features (path bias detection):
- Alter the Path Bias log messages to be more descriptive in terms
of reporting timeouts and other statistics.
- Create three levels of Path Bias log messages, as opposed to just
two. These are configurable via consensus as well as via the torrc
options PathBiasNoticeRate, PathBiasWarnRate, PathBiasExtremeRate.
The default values are 0.70, 0.50, and 0.30 respectively.
- Separate the log message levels from the decision to drop guards,
which also is available via torrc option PathBiasDropGuards.
PathBiasDropGuards still defaults to 0 (off).
- Deprecate PathBiasDisableRate in favor of PathBiasDropGuards
in combination with PathBiasExtremeRate.
- Increase the default values for PathBiasScaleThreshold and
PathBiasCircThreshold from (200, 20) to (300, 150).
- Add in circuit usage accounting to path bias. If we try to use a
built circuit but fail for any reason, it counts as path bias.
Certain classes of circuits where the adversary gets to pick your
destination node are exempt from this accounting. Usage accounting
can be specifically disabled via consensus parameter or torrc.
- Convert all internal path bias state to double-precision floating
point, to avoid roundoff error and other issues.
- Only record path bias information for circuits that have completed
*two* hops. Assuming end-to-end tagging is the attack vector, this
makes us more resilient to ambient circuit failure without any
detection capability loss.
o Minor bugfixes (log messages):
- Rate-limit the "No circuits are opened. Relaxed timeout for a
circuit with channel state open..." message to once per hour to
keep it from filling the notice logs. Mitigates bug 7799 but does
not fix the underlying cause. Bugfix on 0.2.4.7-alpha.
- Avoid spurious warnings when configuring multiple client ports of
which only some are nonlocal. Previously, we had claimed that some
were nonlocal when in fact they weren't. Fixes bug 7836; bugfix on
0.2.3.3-alpha.
o Code simplifications and refactoring:
- Get rid of a couple of harmless clang warnings, where we compared
enums to ints. These warnings are newly introduced in clang 3.2.
- Split the onion.c file into separate modules for the onion queue
and the different handshakes it supports.
- Remove the marshalling/unmarshalling code for sending requests to
cpuworkers over a socket, and instead just send structs. The
recipient will always be the same Tor binary as the sender, so
any encoding is overkill.
Changes in version 0.2.4.7-alpha - 2012-12-24
Tor 0.2.4.7-alpha introduces a new approach to providing fallback
directory mirrors for more robust bootstrapping; fixes more issues where
clients with changing network conditions refuse to make any circuits;
adds initial support for exiting to IPv6 addresses; resumes being able
to update our GeoIP database, and includes the geoip6 file this time;
turns off the client-side DNS cache by default due to privacy risks;
and fixes a variety of other issues.
o Major features (client resilience):
- Add a new "FallbackDir" torrc option to use when we can't use
a directory mirror from the consensus (either because we lack a
consensus, or because they're all down). Currently, all authorities
are fallbacks by default, and there are no other default fallbacks,
but that will change. This option will allow us to give clients a
longer list of servers to try to get a consensus from when first
connecting to the Tor network, and thereby reduce load on the
directory authorities. Implements proposal 206, "Preconfigured
directory sources for bootstrapping". We also removed the old
"FallbackNetworkstatus" option, since we never got it working well
enough to use it. Closes bug 572.
- If we have no circuits open, use a relaxed timeout (the
95-percentile cutoff) until a circuit succeeds. This heuristic
should allow Tor to succeed at building circuits even when the
network connection drastically changes. Should help with bug 3443.
o Major features (IPv6):
- Relays can now exit to IPv6 addresses: make sure that you have IPv6
connectivity, then set the IPv6Exit flag to 1. Also make sure your
exit policy reads as you would like: the address * applies to all
address families, whereas *4 is IPv4 address only, and *6 is IPv6
addresses only. On the client side, you'll need to wait until the
authorities have upgraded, wait for enough exits to support IPv6,
apply the "IPv6Traffic" flag to a SocksPort, and use Socks5. Closes
ticket 5547, implements proposal 117 as revised in proposal 208.
We DO NOT recommend that clients with actual anonymity needs start
using IPv6 over Tor yet, since not enough exits support it yet.
o Major features (geoip database):
- Maxmind began labelling Tor relays as being in country "A1",
which breaks by-country node selection inside Tor. Now we use a
script to replace "A1" ("Anonymous Proxy") entries in our geoip
file with real country codes. This script fixes about 90% of "A1"
entries automatically and uses manual country code assignments to
fix the remaining 10%. See src/config/README.geoip for details.
Fixes bug 6266. Also update to the December 5 2012 Maxmind GeoLite
Country database, as modified above.
o Major bugfixes (client-side DNS):
- Turn off the client-side DNS cache by default. Updating and using
the DNS cache is now configurable on a per-client-port
level. SOCKSPort, DNSPort, etc lines may now contain
{No,}Cache{IPv4,IPv6,}DNS lines to indicate that we shouldn't
cache these types of DNS answers when we receive them from an
exit node in response to an application request on this port, and
{No,}UseCached{IPv4,IPv6,DNS} lines to indicate that if we have
cached DNS answers of these types, we shouldn't use them. It's
potentially risky to use cached DNS answers at the client, since
doing so can indicate to one exit what answers we've gotten
for DNS lookups in the past. With IPv6, this becomes especially
problematic. Using cached DNS answers for requests on the same
circuit would present less linkability risk, since all traffic
on a circuit is already linkable, but it would also provide
little performance benefit: the exit node caches DNS replies
too. Implements a simplified version of Proposal 205. Implements
ticket 7570.
o Major bugfixes (other):
- Alter circuit build timeout measurement to start at the point
where we begin the CREATE/CREATE_FAST step (as opposed to circuit
initialization). This should make our timeout measurements more
uniform. Previously, we were sometimes including ORconn setup time
in our circuit build time measurements. Should resolve bug 3443.
- Fix an assertion that could trigger in hibernate_go_dormant() when
closing an or_connection_t: call channel_mark_for_close() rather
than connection_mark_for_close(). Fixes bug 7267. Bugfix on
0.2.4.4-alpha.
- Include the geoip6 IPv6 GeoIP database in the tarball. Fixes bug
7655; bugfix on 0.2.4.6-alpha.
o Minor features:
- Add a new torrc option "ServerTransportListenAddr" to let bridge
operators select the address where their pluggable transports will
listen for connections. Resolves ticket 7013.
- Allow an optional $ before the node identity digest in the
controller command GETINFO ns/id/<identity>, for consistency with
md/id/<identity> and desc/id/<identity>. Resolves ticket 7059.
- Log packaged cell fullness as part of the heartbeat message.
Diagnosis to try to determine the extent of bug 7743.
o Minor features (IPv6):
- AutomapHostsOnResolve now supports IPv6 addresses. By default, we
prefer to hand out virtual IPv6 addresses, since there are more of
them and we can't run out. To override this behavior and make IPv4
addresses preferred, set NoPreferIPv6Automap on whatever SOCKSPort
or DNSPort you're using for resolving. Implements ticket 7571.
- AutomapHostsOnResolve responses are now randomized, to avoid
annoying situations where Tor is restarted and applications
connect to the wrong addresses.
- Never try more than 1000 times to pick a new virtual address when
AutomapHostsOnResolve is set. That's good enough so long as we
aren't close to handing out our entire virtual address space;
if you're getting there, it's best to switch to IPv6 virtual
addresses anyway.
o Minor bugfixes:
- The ADDRMAP command can no longer generate an ill-formed error
code on a failed MAPADDRESS. It now says "internal" rather than
an English sentence fragment with spaces in the middle. Bugfix on
Tor 0.2.0.19-alpha.
- Fix log messages and comments to avoid saying "GMT" when we mean
"UTC". Fixes bug 6113.
- Compile on win64 using mingw64. Fixes bug 7260; patches from
"yayooo".
- Fix a crash when debugging unit tests on Windows: deallocate a
shared library with FreeLibrary, not CloseHandle. Fixes bug 7306;
bugfix on 0.2.2.17-alpha. Reported by "ultramage".
o Renamed options:
- The DirServer option is now DirAuthority, for consistency with
current naming patterns. You can still use the old DirServer form.
o Code simplification and refactoring:
- Move the client-side address-map/virtual-address/DNS-cache code
out of connection_edge.c into a new addressmap.c module.
- Remove unused code for parsing v1 directories and "running routers"
documents. Fixes bug 6887.
Changes in version 0.2.3.25 - 2012-11-19
The Tor 0.2.3 release series is dedicated to the memory of Len "rabbi"
Sassaman (1980-2011), a long-time cypherpunk, anonymity researcher,
Mixmaster maintainer, Pynchon Gate co-designer, CodeCon organizer,
programmer, and friend. Unstinting in his dedication to the cause of
freedom, he inspired and helped many of us as we began our work on
anonymity, and inspires us still. Please honor his memory by writing
software to protect people's freedoms, and by helping others to do so.
Tor 0.2.3.25, the first stable release in the 0.2.3 branch, features
significantly reduced directory overhead (via microdescriptors),
enormous crypto performance improvements for fast relays on new
enough hardware, a new v3 TLS handshake protocol that can better
resist fingerprinting, support for protocol obfuscation plugins (aka
pluggable transports), better scalability for hidden services, IPv6
support for bridges, performance improvements like allowing clients
to skip the first round-trip on the circuit ("optimistic data") and
refilling token buckets more often, a new "stream isolation" design
to isolate different applications on different circuits, and many
stability, security, and privacy fixes.
o Major bugfixes:
- Tor tries to wipe potentially sensitive data after using it, so
that if some subsequent security failure exposes Tor's memory,
the damage will be limited. But we had a bug where the compiler
was eliminating these wipe operations when it decided that the
memory was no longer visible to a (correctly running) program,
hence defeating our attempt at defense in depth. We fix that
by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
is unlikely to optimize away. Future versions of Tor may use
a less ridiculously heavy approach for this. Fixes bug 7352.
Reported in an article by Andrey Karpov.
o Minor bugfixes:
- Fix a harmless bug when opting against publishing a relay descriptor
because DisableNetwork is set. Fixes bug 7464; bugfix on
0.2.3.9-alpha.
Changes in version 0.2.4.6-alpha - 2012-11-13
Tor 0.2.4.6-alpha fixes an assert bug that has been plaguing relays,
makes our defense-in-depth memory wiping more reliable, and begins to
count IPv6 addresses in bridge statistics,
o Major bugfixes:
- Fix an assertion failure that could occur when closing a connection
with a spliced rendezvous circuit. Fix for bug 7212; bugfix on
Tor 0.2.4.4-alpha.
- Tor tries to wipe potentially sensitive data after using it, so
that if some subsequent security failure exposes Tor's memory,
the damage will be limited. But we had a bug where the compiler
was eliminating these wipe operations when it decided that the
memory was no longer visible to a (correctly running) program,
hence defeating our attempt at defense in depth. We fix that
by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
is unlikely to optimize away. Future versions of Tor may use
a less ridiculously heavy approach for this. Fixes bug 7352.
Reported in an article by Andrey Karpov.
o Minor features:
- Add GeoIP database for IPv6 addresses. The new config option
is GeoIPv6File.
- Bridge statistics now count bridge clients connecting over IPv6:
bridge statistics files now list "bridge-ip-versions" and
extra-info documents list "geoip6-db-digest". The control protocol
"CLIENTS_SEEN" and "ip-to-country" queries now support IPv6. Initial
implementation by "shkoo", addressing ticket 5055.
o Minor bugfixes:
- Warn when we are binding low ports when hibernation is enabled;
previously we had warned when we were _advertising_ low ports with
hibernation enabled. Fixes bug 7285; bugfix on 0.2.3.9-alpha.
- Fix a harmless bug when opting against publishing a relay descriptor
because DisableNetwork is set. Fixes bug 7464; bugfix on
0.2.3.9-alpha.
- Add warning message when a managed proxy dies during configuration.
Fixes bug 7195; bugfix on 0.2.4.2-alpha.
- Fix a linking error when building tor-fw-helper without miniupnp.
Fixes bug 7235; bugfix on 0.2.4.2-alpha. Fix by Anthony G. Basile.
- Check for closing an or_connection_t without going through correct
channel functions; emit a warning and then call
connection_or_close_for_error() so we don't assert as in bugs 7212
and 7267.
- Compile correctly on compilers without C99 designated initializer
support. Fixes bug 7286; bugfix on 0.2.4.4-alpha.
- Avoid a possible assert that can occur when channel_send_destroy() is
called on a channel in CHANNEL_STATE_CLOSING, CHANNEL_STATE_CLOSED,
or CHANNEL_STATE_ERROR when the Tor process is resumed after being
blocked for a long interval. Fixes bug 7350; bugfix on 0.2.4.4-alpha.
- Fix a memory leak on failing cases of channel_tls_process_certs_cell.
Fixes bug 7422; bugfix on 0.2.4.4-alpha.
o Code simplification and refactoring:
- Start using OpenBSD's implementation of queue.h, so that we don't
need to hand-roll our own pointer and list structures whenever we
need them. (We can't rely on a sys/queue.h, since some operating
systems don't have them, and the ones that do have them don't all
present the same extensions.)
Changes in version 0.2.4.5-alpha - 2012-10-25
Tor 0.2.4.5-alpha comes hard at the heels of 0.2.4.4-alpha, to fix
two important security vulnerabilities that could lead to remotely
triggerable relay crashes, fix a major bug that was preventing clients
from choosing suitable exit nodes, and refactor some of our code.
o Major bugfixes (security, also in 0.2.3.24-rc):
- Fix a group of remotely triggerable assertion failures related to
incorrect link protocol negotiation. Found, diagnosed, and fixed
by "some guy from France". Fix for CVE-2012-2250; bugfix on
0.2.3.6-alpha.
- Fix a denial of service attack by which any directory authority
could crash all the others, or by which a single v2 directory
authority could crash everybody downloading v2 directory
information. Fixes bug 7191; bugfix on 0.2.0.10-alpha.
o Major bugfixes (also in 0.2.3.24-rc):
- When parsing exit policy summaries from microdescriptors, we had
previously been ignoring the last character in each one, so that
"accept 80,443,8080" would be treated by clients as indicating
a node that allows access to ports 80, 443, and 808. That would
lead to clients attempting connections that could never work,
and ignoring exit nodes that would support their connections. Now
clients parse these exit policy summaries correctly. Fixes bug 7192;
bugfix on 0.2.3.1-alpha.
o Minor bugfixes (also in 0.2.3.24-rc):
- Clients now consider the ClientRejectInternalAddresses config option
when using a microdescriptor consensus stanza to decide whether
an exit relay would allow exiting to an internal address. Fixes
bug 7190; bugfix on 0.2.3.1-alpha.
o Minor bugfixes:
- Only disable TLS session ticket support when running as a TLS
server. Now clients will blend better with regular Firefox
connections. Fixes bug 7189; bugfix on Tor 0.2.3.23-rc.
o Code simplification and refactoring:
- Start using OpenBSD's implementation of queue.h (originally by
Niels Provos).
- Move the entry node code from circuitbuild.c to its own file.
- Move the circuit build timeout tracking code from circuitbuild.c
to its own file.
Changes in version 0.2.3.24-rc - 2012-10-25
Tor 0.2.3.24-rc fixes two important security vulnerabilities that
could lead to remotely triggerable relay crashes, and fixes
a major bug that was preventing clients from choosing suitable exit
nodes.
o Major bugfixes (security):
- Fix a group of remotely triggerable assertion failures related to
incorrect link protocol negotiation. Found, diagnosed, and fixed
by "some guy from France". Fix for CVE-2012-2250; bugfix on
0.2.3.6-alpha.
- Fix a denial of service attack by which any directory authority
could crash all the others, or by which a single v2 directory
authority could crash everybody downloading v2 directory
information. Fixes bug 7191; bugfix on 0.2.0.10-alpha.
o Major bugfixes:
- When parsing exit policy summaries from microdescriptors, we had
previously been ignoring the last character in each one, so that
"accept 80,443,8080" would be treated by clients as indicating
a node that allows access to ports 80, 443, and 808. That would
lead to clients attempting connections that could never work,
and ignoring exit nodes that would support their connections. Now
clients parse these exit policy summaries correctly. Fixes bug 7192;
bugfix on 0.2.3.1-alpha.
o Minor bugfixes:
- Clients now consider the ClientRejectInternalAddresses config option
when using a microdescriptor consensus stanza to decide whether
an exit relay would allow exiting to an internal address. Fixes
bug 7190; bugfix on 0.2.3.1-alpha.
Changes in version 0.2.4.4-alpha - 2012-10-20
Tor 0.2.4.4-alpha adds a new v3 directory authority, fixes a privacy
vulnerability introduced by a change in OpenSSL, fixes a remotely
triggerable assert, and adds new channel_t and circuitmux_t abstractions
that will make it easier to test new connection transport and cell
scheduling algorithms.
o New directory authorities (also in 0.2.3.23-rc):
- Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
authority. Closes ticket 5749.
o Major bugfixes (security/privacy, also in 0.2.3.23-rc):
- Disable TLS session tickets. OpenSSL's implementation was giving
our TLS session keys the lifetime of our TLS context objects, when
perfect forward secrecy would want us to discard anything that
could decrypt a link connection as soon as the link connection
was closed. Fixes bug 7139; bugfix on all versions of Tor linked
against OpenSSL 1.0.0 or later. Found by Florent Daignière.
- Discard extraneous renegotiation attempts once the V3 link
protocol has been initiated. Failure to do so left us open to
a remotely triggerable assertion failure. Fixes CVE-2012-2249;
bugfix on 0.2.3.6-alpha. Reported by "some guy from France".
o Internal abstraction features:
- Introduce new channel_t abstraction between circuits and
or_connection_t to allow for implementing alternate OR-to-OR
transports. A channel_t is an abstract object which can either be a
cell-bearing channel, which is responsible for authenticating and
handshaking with the remote OR and transmitting cells to and from
it, or a listening channel, which spawns new cell-bearing channels
at the request of remote ORs. Implements part of ticket 6465.
- Also new is the channel_tls_t subclass of channel_t, adapting it
to the existing or_connection_t code. The V2/V3 protocol handshaking
code which formerly resided in command.c has been moved below the
channel_t abstraction layer and may be found in channeltls.c now.
Implements the rest of ticket 6465.
- Introduce new circuitmux_t storing the queue of circuits for
a channel; this encapsulates and abstracts the queue logic and
circuit selection policy, and allows the latter to be overridden
easily by switching out a policy object. The existing EWMA behavior
is now implemented as a circuitmux_policy_t. Resolves ticket 6816.
o Required libraries:
- Tor now requires OpenSSL 0.9.8 or later. OpenSSL 1.0.0 or later is
strongly recommended.
o Minor features:
- Warn users who run hidden services on a Tor client with
UseEntryGuards disabled that their hidden services will be
vulnerable to http://freehaven.net/anonbib/#hs-attack06 (the
attack which motivated Tor to support entry guards in the first
place). Resolves ticket 6889.
- Tor now builds correctly on Bitrig, an OpenBSD fork. Patch from
dhill. Resolves ticket 6982.
- Option OutboundBindAddress can be specified multiple times and
accepts IPv6 addresses. Resolves ticket 6876.
o Minor bugfixes (also in 0.2.3.23-rc):
- Don't serve or accept v2 hidden service descriptors over a
relay's DirPort. It's never correct to do so, and disabling it
might make it more annoying to exploit any bugs that turn up in the
descriptor-parsing code. Fixes bug 7149.
- Fix two cases in src/or/transports.c where we were calling
fmt_addr() twice in a parameter list. Bug found by David
Fifield. Fixes bug 7014; bugfix on 0.2.3.9-alpha.
- Fix memory leaks whenever we logged any message about the "path
bias" detection. Fixes bug 7022; bugfix on 0.2.3.21-rc.
- When relays refuse a "create" cell because their queue of pending
create cells is too big (typically because their cpu can't keep up
with the arrival rate), send back reason "resource limit" rather
than reason "internal", so network measurement scripts can get a
more accurate picture. Fixes bug 7037; bugfix on 0.1.1.11-alpha.
o Minor bugfixes:
- Command-line option "--version" implies "--quiet". Fixes bug 6997.
- Free some more still-in-use memory at exit, to make hunting for
memory leaks easier. Resolves bug 7029.
- When a Tor client gets a "truncated" relay cell, the first byte of
its payload specifies why the circuit was truncated. We were
ignoring this 'reason' byte when tearing down the circuit, resulting
in the controller not being told why the circuit closed. Now we
pass the reason from the truncated cell to the controller. Bugfix
on 0.1.2.3-alpha; fixes bug 7039.
- Downgrade "Failed to hand off onionskin" messages to "debug"
severity, since they're typically redundant with the "Your computer
is too slow" messages. Fixes bug 7038; bugfix on 0.2.2.16-alpha.
- Make clients running with IPv6 bridges connect over IPv6 again,
even without setting new config options ClientUseIPv6 and
ClientPreferIPv6ORPort. Fixes bug 6757; bugfix on 0.2.4.1-alpha.
- Use square brackets around IPv6 addresses in numerous places
that needed them, including log messages, HTTPS CONNECT proxy
requests, TransportProxy statefile entries, and pluggable transport
extra-info lines. Fixes bug 7011; patch by David Fifield.
o Code refactoring and cleanup:
- Source files taken from other packages now reside in src/ext;
previously they were scattered around the rest of Tor.
- Avoid use of reserved identifiers in our C code. The C standard
doesn't like us declaring anything that starts with an
underscore, so let's knock it off before we get in trouble. Fix
for bug 1031; bugfix on the first Tor commit.
Changes in version 0.2.3.23-rc - 2012-10-20
Tor 0.2.3.23-rc adds a new v3 directory authority, fixes a privacy
vulnerability introduced by a change in OpenSSL, and fixes a variety
of smaller bugs in preparation for the release.
o New directory authorities:
- Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
authority. Closes ticket 5749.
o Major bugfixes (security/privacy):
- Disable TLS session tickets. OpenSSL's implementation was giving
our TLS session keys the lifetime of our TLS context objects, when
perfect forward secrecy would want us to discard anything that
could decrypt a link connection as soon as the link connection
was closed. Fixes bug 7139; bugfix on all versions of Tor linked
against OpenSSL 1.0.0 or later. Found by Florent Daignière.
- Discard extraneous renegotiation attempts once the V3 link
protocol has been initiated. Failure to do so left us open to
a remotely triggerable assertion failure. Fixes CVE-2012-2249;
bugfix on 0.2.3.6-alpha. Reported by "some guy from France".
o Major bugfixes:
- Fix a possible crash bug when checking for deactivated circuits
in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
bugfix on 0.2.2.7-alpha. Bug report and fix received pseudonymously.
o Minor bugfixes (on 0.2.3.x):
- Fix two cases in src/or/transports.c where we were calling
fmt_addr() twice in a parameter list. Bug found by David
Fifield. Fixes bug 7014; bugfix on 0.2.3.9-alpha.
- Convert an assert in the pathbias code to a log message. The assert
appears to only be triggerable by Tor2Web mode. Fixes bug 6866;
bugfix on 0.2.3.17-beta.
- Fix memory leaks whenever we logged any message about the "path
bias" detection. Fixes bug 7022; bugfix on 0.2.3.21-rc.
o Minor bugfixes (on 0.2.2.x and earlier):
- Don't serve or accept v2 hidden service descriptors over a relay's
DirPort. It's never correct to do so, and disabling it might
make it more annoying to exploit any bugs that turn up in the
descriptor-parsing code. Fixes bug 7149.
- When relays refuse a "create" cell because their queue of pending
create cells is too big (typically because their cpu can't keep up
with the arrival rate), send back reason "resource limit" rather
than reason "internal", so network measurement scripts can get a
more accurate picture. Bugfix on 0.1.1.11-alpha; fixes bug 7037.
- Correct file sizes when reading binary files on Cygwin, to avoid
a bug where Tor would fail to read its state file. Fixes bug 6844;
bugfix on 0.1.2.7-alpha.
- Avoid undefined behavior when parsing the list of supported
rendezvous/introduction protocols in a hidden service descriptor.
Previously, Tor would have confused (as-yet-unused) protocol version
numbers greater than 32 with lower ones on many platforms. Fixes
bug 6827; bugfix on 0.2.0.10-alpha. Found by George Kadianakis.
o Documentation fixes:
- Clarify that hidden services are TCP only. Fixes bug 6024.
Changes in version 0.2.4.3-alpha - 2012-09-22
Tor 0.2.4.3-alpha fixes another opportunity for a remotely triggerable
assertion, resumes letting relays test reachability of their DirPort,
and cleans up a bunch of smaller bugs.
o Security fixes:
- Fix an assertion failure in tor_timegm() that could be triggered
by a badly formatted directory object. Bug found by fuzzing with
Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
o Major bugfixes:
- Fix a possible crash bug when checking for deactivated circuits
in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
bugfix on 0.2.2.7-alpha. Bug report and fix received pseudonymously.
- Allow routers to detect that their own DirPorts are running. When
we removed support for versions_supports_begindir, we also
accidentally removed the mechanism we used to self-test our
DirPort. Diagnosed with help from kargig. Fixes bugs 6814 and 6815;
bugfix on 0.2.4.2-alpha.
o Security features:
- Switch to a completely time-invariant approach for picking nodes
weighted by bandwidth. Our old approach would run through the
part of the loop after it had made its choice slightly slower
than it ran through the part of the loop before it had made its
choice. Addresses ticket 6538.
- Disable the use of Guard nodes when in Tor2WebMode. Guard usage
by tor2web clients allows hidden services to identify tor2web
clients through their repeated selection of the same rendezvous
and introduction point circuit endpoints (their guards). Resolves
ticket 6888.
o Minor features:
- Enable Tor to read configuration, state, and key information from
a FIFO. Previously Tor would only read from files with a positive
stat.st_size. Code from meejah; fixes bug 6044.
o Minor bugfixes:
- Correct file sizes when reading binary files on Cygwin, to avoid
a bug where Tor would fail to read its state file. Fixes bug 6844;
bugfix on 0.1.2.7-alpha.
- Correctly handle votes with more than 31 flags. Fixes bug 6853;
bugfix on 0.2.0.3-alpha.
- When complaining about a client port on a public address, log
which address we're complaining about. Fixes bug 4020; bugfix on
0.2.3.3-alpha. Patch by Tom Fitzhenry.
- Convert an assert in the pathbias code to a log message. The assert
appears to only be triggerable by Tor2Web mode. Fixes bug 6866;
bugfix on 0.2.3.17-beta.
- Our new buildsystem was overzealous about rebuilding manpages: it
would rebuild them all whenever any one of them changed. Now our
dependency checking should be correct. Fixes bug 6843; bugfix on
0.2.4.1-alpha.
- Don't do reachability testing over IPv6 unless AuthDirPublishIPv6
is set. Fixes bug 6880. Bugfix on 0.2.4.1-alpha.
- Correct log printout about which address family is preferred
when connecting to a bridge with both an IPv4 and IPv6 OR port.
Fixes bug 6884; bugfix on 0.2.4.1-alpha.
o Minor bugfixes (code cleanliness):
- Fix round_to_power_of_2() so it doesn't invoke undefined behavior
with large values. This situation was untriggered, but nevertheless
incorrect. Fixes bug 6831; bugfix on 0.2.0.1-alpha.
- Reject consensus votes with more than 64 known-flags. We aren't even
close to that limit yet, and our code doesn't handle it correctly.
Fixes bug 6833; bugfix on 0.2.0.1-alpha.
- Avoid undefined behavior when parsing the list of supported
rendezvous/introduction protocols in a hidden service descriptor.
Previously, Tor would have confused (as-yet-unused) protocol version
numbers greater than 32 with lower ones on many platforms. Fixes
bug 6827; bugfix on 0.2.0.10-alpha. Found by George Kadianakis.
- Fix handling of rendezvous client authorization types over 8.
Fixes bug 6861; bugfix on 0.2.1.5-alpha.
- Fix building with older versions of GCC (2.95, for one) that don't
like preprocessor directives inside macro arguments. Found by
grarpamp. Fixes bug 6842; bugfix on 0.2.4.2-alpha.
- Switch weighted node selection rule from using a list of doubles
to using a list of int64_t. This change should make the process
slightly easier to debug and maintain. Needed to finish ticket 6538.
o Code simplification and refactoring:
- Move the generic "config" code into a new file, and have "config.c"
hold only torrc- and state-related code. Resolves ticket 6823.
- Move the core of our "choose a weighted element at random" logic
into its own function, and give it unit tests. Now the logic is
testable, and a little less fragile too.
- Removed the testing_since field of node_t, which hasn't been used
for anything since 0.2.0.9-alpha.
o Documentation fixes:
- Clarify that hidden services are TCP only. Fixes bug 6024.
- Resolve a typo in torrc.sample.in. Fixes bug 6819; bugfix on
0.2.3.14-alpha.
Changes in version 0.2.3.22-rc - 2012-09-11
Tor 0.2.3.22-rc fixes another opportunity for a remotely triggerable
assertion.
o Security fixes:
- Fix an assertion failure in tor_timegm() that could be triggered
by a badly formatted directory object. Bug found by fuzzing with
Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
o Minor bugfixes:
- Avoid segfault when starting up having run with an extremely old
version of Tor and parsing its state file. Fixes bug 6801; bugfix
on 0.2.2.23-alpha.
Changes in version 0.2.2.39 - 2012-09-11
Tor 0.2.2.39 fixes two more opportunities for remotely triggerable
assertions.
o Security fixes:
- Fix an assertion failure in tor_timegm() that could be triggered
by a badly formatted directory object. Bug found by fuzzing with
Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
- Do not crash when comparing an address with port value 0 to an
address policy. This bug could have been used to cause a remote
assertion failure by or against directory authorities, or to
allow some applications to crash clients. Fixes bug 6690; bugfix
on 0.2.1.10-alpha.
Changes in version 0.2.4.2-alpha - 2012-09-10
Tor 0.2.4.2-alpha enables port forwarding for pluggable transports,
raises the default rate limiting even more, and makes the bootstrapping
log messages less noisy.
o Major features:
- Automatically forward the TCP ports of pluggable transport
proxies using tor-fw-helper if PortForwarding is enabled. Implements
ticket 4567.
o Major bugfixes:
- Raise the default BandwidthRate/BandwidthBurst values from 5MB/10MB
to 1GB/1GB. The previous defaults were intended to be "basically
infinite", but it turns out they're now limiting our 100mbit+
relays and bridges. Fixes bug 6605; bugfix on 0.2.0.10-alpha (the
last time we raised it).
o Minor features:
- Detect when we're running with a version of OpenSSL other than the
one we compiled with. This has occasionally given people hard-to-
track-down errors.
- Log fewer lines at level "notice" about our OpenSSL and Libevent
versions and capabilities when everything is going right. Resolves
part of ticket 6736.
- Directory authorities no long accept descriptors for any version of
Tor before 0.2.2.35, or for any 0.2.3 release before 0.2.3.10-alpha.
These versions are insecure, unsupported, or both. Implements
ticket 6789.
o Minor bugfixes:
- Rename the (internal-use-only) UsingTestingNetworkDefaults option
to start with a triple-underscore so the controller won't touch it.
Patch by Meejah. Fixes bug 3155. Bugfix on 0.2.2.23-alpha.
- Avoid segfault when starting up having run with an extremely old
version of Tor and parsing its state file. Fixes bug 6801; bugfix
on 0.2.2.23-alpha.
- Rename the (testing-use-only) _UseFilteringSSLBufferevents option
so it doesn't start with _. Fixes bug 3155. Bugfix on 0.2.3.1-alpha.
- Don't follow the NULL pointer if microdescriptor generation fails.
(This does not appear to be triggerable, but it's best to be safe.)
Found by "f. tp.". Fixes bug 6797; bugfix on 0.2.4.1-alpha.
- Fix mis-declared dependencies on src/common/crypto.c and
src/or/tor_main.c that could break out-of-tree builds under some
circumstances. Fixes bug 6778; bugfix on 0.2.4.1-alpha.
- Avoid a warning when building common_sha1.i out of tree. Fixes bug
6778; bugfix on 0.2.4.1-alpha.
- Fix a harmless (in this case) build warning for implicitly
converting a strlen() to an int. Bugfix on 0.2.4.1-alpha.
o Removed features:
- Now that all versions before 0.2.2.x are disallowed, we no longer
need to work around their missing features. Thus we can remove a
bunch of compatibility code.
o Code refactoring:
- Tweak tor-fw-helper to accept an arbitrary amount of arbitrary
TCP ports to forward. In the past it only accepted two ports:
the ORPort and the DirPort.
Changes in version 0.2.4.1-alpha - 2012-09-05
Tor 0.2.4.1-alpha lets bridges publish their pluggable transports to
bridgedb; lets relays use IPv6 addresses and directory authorities
advertise them; and switches to a cleaner build interface.
This is the first alpha release in a new series, so expect there to
be bugs. Users who would rather test out a more stable branch should
stay with 0.2.3.x for now.
o Major features (bridges):
- Bridges now report the pluggable transports they support to the
bridge authority, so it can pass the supported transports on to
bridgedb and/or eventually do reachability testing. Implements
ticket 3589.
o Major features (IPv6):
- Bridge authorities now accept IPv6 bridge addresses and include
them in network status documents. Implements ticket 5534.
- Clients who set "ClientUseIPv6 1" may connect to entry nodes over
IPv6. Set "ClientPreferIPv6ORPort 1" to make this even more likely
to happen. Implements ticket 5535.
- All kind of relays, not just bridges, can now advertise an IPv6
OR port. Implements ticket 6362.
- Directory authorities vote on IPv6 OR ports using the new consensus
method 14. Implements ticket 6363.
o Major features (build):
- Switch to a nonrecursive Makefile structure. Now instead of each
Makefile.am invoking other Makefile.am's, there is a master
Makefile.am that includes the others. This change makes our build
process slightly more maintainable, and improves parallelism for
building with make -j. Original patch by Stewart Smith; various
fixes by Jim Meyering.
- Where available, we now use automake's "silent" make rules by
default, so that warnings are easier to spot. You can get the old
behavior with "make V=1". Patch by Stewart Smith for ticket 6522.
o Minor features (code security and spec conformance):
- Clear keys and key-derived material left on the stack in
rendservice.c and rendclient.c. Check return value of
crypto_pk_write_private_key_to_string() in rend_service_load_keys().
These fixes should make us more forward-secure against cold-boot
attacks and the like. Fixes bug 2385.
- Reject EXTEND cells sent to nonexistent streams. According to the
spec, an EXTEND cell sent to _any_ nonzero stream ID is invalid, but
we were only checking for stream IDs that were currently in use.
Found while hunting for more instances of bug 6271. Bugfix on
0.0.2pre8, which introduced incremental circuit construction.
o Minor features (streamlining);
- No longer include the "opt" prefix when generating routerinfos
or v2 directories: it has been needless since Tor 0.1.2. Closes
ticket 5124.
- Remove some now-needless code that tried to aggressively flush
OR connections as data was added to them. Since 0.2.0.1-alpha, our
cell queue logic has saved us from the failure mode that this code
was supposed to prevent. Removing this code will limit the number
of baroque control flow paths through Tor's network logic. Reported
pseudonymously on IRC. Fixes bug 6468; bugfix on 0.2.0.1-alpha.
o Minor features (controller):
- Add a "GETINFO signal/names" control port command. Implements
ticket 3842.
- Provide default values for all options via "GETINFO config/defaults".
Implements ticket 4971.
o Minor features (IPv6):
- New config option "AuthDirHasIPv6Connectivity 1" that directory
authorities should set if they have IPv6 connectivity and want to
do reachability tests for IPv6 relays. Implements feature 5974.
- A relay with an IPv6 OR port now sends that address in NETINFO
cells (in addition to its other address). Implements ticket 6364.
o Minor features (log messages):
- Omit the first heartbeat log message, because it never has anything
useful to say, and it clutters up the bootstrapping messages.
Resolves ticket 6758.
- Don't log about reloading the microdescriptor cache at startup. Our
bootstrap warnings are supposed to tell the user when there's a
problem, and our bootstrap notices say when there isn't. Resolves
ticket 6759; bugfix on 0.2.2.6-alpha.
- Don't log "I learned some more directory information" when we're
reading cached directory information. Reserve it for when new
directory information arrives in response to a fetch. Resolves
ticket 6760.
- Prevent rounding error in path bias counts when scaling
them down, and use the correct scale factor default. Also demote
some path bias related log messages down a level and make others
less scary sounding. Fixes bug 6647. Bugfix against 0.2.3.17-beta.
- We no longer warn so much when generating manpages from their
asciidoc source.
o Code simplifications and refactoring:
- Enhance our internal sscanf replacement so that we can eliminate
the last remaining uses of the system sscanf. (Though those uses
of sscanf were safe, sscanf itself is generally error prone, so
we want to eliminate when we can.) Fixes ticket 4195 and Coverity
CID 448.
- Move ipv6_preferred from routerinfo_t to node_t. Addresses bug 4620.
- Move last_reachable and testing_since from routerinfo_t to node_t.
Implements ticket 5529.
- Add replaycache_t structure, functions and unit tests, then refactor
rend_service_introduce() to be more clear to read, improve, debug,
and test. Resolves bug 6177.
- Finally remove support for malloc_good_size and malloc_usable_size.
We had hoped that these functions would let us eke a little more
memory out of our malloc implementation. Unfortunately, the only
implementations that provided these functions are also ones that
are already efficient about not overallocation: they never got us
more than 7 or so bytes per allocation. Removing them saves us a
little code complexity and a nontrivial amount of build complexity.
o New requirements:
- Tor maintainers now require Automake version 1.9 or later to build
Tor from the Git repository. (Automake is not required when building
from a source distribution.)
Changes in version 0.2.3.21-rc - 2012-09-05
Tor 0.2.3.21-rc is the fourth release candidate for the Tor 0.2.3.x
series. It fixes a trio of potential security bugs, fixes a bug where
we were leaving some of the fast relays out of the microdescriptor
consensus, resumes interpreting "ORPort 0" and "DirPort 0" correctly,
and cleans up other smaller issues.
o Major bugfixes (security):
- Tear down the circuit if we get an unexpected SENDME cell. Clients
could use this trick to make their circuits receive cells faster
than our flow control would have allowed, or to gum up the network,
or possibly to do targeted memory denial-of-service attacks on
entry nodes. Fixes bug 6252. Bugfix on the 54th commit on Tor --
from July 2002, before the release of Tor 0.0.0. We had committed
this patch previously, but we had to revert it because of bug 6271.
Now that 6271 is fixed, this patch appears to work.
- Reject any attempt to extend to an internal address. Without
this fix, a router could be used to probe addresses on an internal
network to see whether they were accepting connections. Fixes bug
6710; bugfix on 0.0.8pre1.
- Do not crash when comparing an address with port value 0 to an
address policy. This bug could have been used to cause a remote
assertion failure by or against directory authorities, or to
allow some applications to crash clients. Fixes bug 6690; bugfix
on 0.2.1.10-alpha.
o Major bugfixes:
- Remove the upper bound on microdescriptor length. We were hitting
the limit for routers with complex exit policies or family
declarations, causing clients to not use them. Fixes the first
piece of bug 6404; fix on 0.2.2.6-alpha.
- Detect "ORPort 0" as meaning, uniformly, that we're not running
as a relay. Previously, some of our code would treat the presence
of any ORPort line as meaning that we should act like a relay,
even though our new listener code would correctly not open any
ORPorts for ORPort 0. Similar bugs in other Port options are also
fixed. Fixes the first half of bug 6507; bugfix on 0.2.3.3-alpha.
o Minor bugfixes:
- Avoid a pair of double-free and use-after-mark bugs that can
occur with certain timings in canceled and re-received DNS
requests. Fixes bug 6472; bugfix on 0.0.7rc1.
- Fix build and 64-bit compile warnings from --enable-openbsd-malloc.
Fixes bug 6379. Bugfix on 0.2.0.20-rc.
- Allow one-hop directory fetching circuits the full "circuit build
timeout" period, rather than just half of it, before failing them
and marking the relay down. This fix should help reduce cases where
clients declare relays (or worse, bridges) unreachable because
the TLS handshake takes a few seconds to complete. Fixes bug 6743;
bugfix on 0.2.2.2-alpha, where we changed the timeout from a static
30 seconds.
- Authorities no longer include any router in their microdescriptor
consensuses for which they couldn't generate or agree on a
microdescriptor. Fixes the second piece of bug 6404; fix on
0.2.2.6-alpha.
- Detect and reject attempts to specify both "FooPort" and
"FooPort 0" in the same configuration domain. (It's still okay
to have a FooPort in your configuration file, and use "FooPort 0"
on the command line to disable it.) Fixes the second half of bug
6507; bugfix on 0.2.3.3-alpha.
- Make wildcarded addresses (that is, ones beginning with "*.") work
when provided via the controller's MapAddress command. Previously,
they were accepted, but we never actually noticed that they were
wildcards. Fixes bug 6244; bugfix on 0.2.3.9-alpha.
- Avoid crashing on a malformed state file where EntryGuardPathBias
precedes EntryGuard. Fix for bug 6774; bugfix on 0.2.3.17-beta.
- Add a (probably redundant) memory clear between iterations of
the router status voting loop, to prevent future coding errors
where data might leak between iterations of the loop. Resolves
ticket 6514.
o Minor bugfixes (log messages):
- Downgrade "set buildtimeout to low value" messages to "info"
severity; they were never an actual problem, there was never
anything reasonable to do about them, and they tended to spam logs
from time to time. Fixes bug 6251; bugfix on 0.2.2.2-alpha.
- Downgrade path-bias warning messages to "info". We'll try to get
them working better in 0.2.4. Add internal circuit construction
state to protect against the noisy warn message "Unexpectedly high
circuit_successes". Also add some additional rate-limited notice
messages to help determine the root cause of the warn. Fixes bug
6475. Bugfix against 0.2.3.17-beta.
- Move log message when unable to find a microdesc in a routerstatus
entry to parse time. Previously we'd spam this warning every time
we tried to figure out which microdescriptors to download. Fixes
the third piece of bug 6404; fix on 0.2.3.18-rc.
o Minor features:
- Consider new, removed or changed IPv6 OR ports a non-cosmetic
change when the authority is deciding whether to accept a newly
uploaded descriptor. Implements ticket 6423.
- Add missing documentation for consensus and microdesc files.
Resolves ticket 6732.
Changes in version 0.2.2.38 - 2012-08-12
Tor 0.2.2.38 fixes a remotely triggerable crash bug, and fixes a timing
attack that could in theory leak path information.
o Security fixes:
- Avoid an uninitialized memory read when reading a vote or consensus
document that has an unrecognized flavor name. This read could
lead to a remote crash bug. Fixes bug 6530; bugfix on 0.2.2.6-alpha.
- Try to leak less information about what relays a client is
choosing to a side-channel attacker. Previously, a Tor client would
stop iterating through the list of available relays as soon as it
had chosen one, thus finishing a little earlier when it picked
a router earlier in the list. If an attacker can recover this
timing information (nontrivial but not proven to be impossible),
they could learn some coarse-grained information about which relays
a client was picking (middle nodes in particular are likelier to
be affected than exits). The timing attack might be mitigated by
other factors (see bug 6537 for some discussion), but it's best
not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
Changes in version 0.2.3.20-rc - 2012-08-05
Tor 0.2.3.20-rc is the third release candidate for the Tor 0.2.3.x
series. It fixes a pair of code security bugs and a potential anonymity
issue, updates our RPM spec files, and cleans up other smaller issues.
o Security fixes:
- Avoid read-from-freed-memory and double-free bugs that could occur
when a DNS request fails while launching it. Fixes bug 6480;
bugfix on 0.2.0.1-alpha.
- Avoid an uninitialized memory read when reading a vote or consensus
document that has an unrecognized flavor name. This read could
lead to a remote crash bug. Fixes bug 6530; bugfix on 0.2.2.6-alpha.
- Try to leak less information about what relays a client is
choosing to a side-channel attacker. Previously, a Tor client would
stop iterating through the list of available relays as soon as it
had chosen one, thus finishing a little earlier when it picked
a router earlier in the list. If an attacker can recover this
timing information (nontrivial but not proven to be impossible),
they could learn some coarse-grained information about which relays
a client was picking (middle nodes in particular are likelier to
be affected than exits). The timing attack might be mitigated by
other factors (see bug 6537 for some discussion), but it's best
not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
o Minor features:
- Try to make the warning when giving an obsolete SOCKSListenAddress
a little more useful.
- Terminate active server managed proxies if Tor stops being a
relay. Addresses parts of bug 6274; bugfix on 0.2.3.6-alpha.
- Provide a better error message about possible OSX Asciidoc failure
reasons. Fixes bug 6436.
- Warn when Tor is configured to use accounting in a way that can
link a hidden service to some other hidden service or public
address. Resolves ticket 6490.
o Minor bugfixes:
- Check return value of fputs() when writing authority certificate
file. Fixes Coverity issue 709056; bugfix on 0.2.0.1-alpha.
- Ignore ServerTransportPlugin lines when Tor is not configured as
a relay. Fixes bug 6274; bugfix on 0.2.3.6-alpha.
- When disabling guards for having too high a proportion of failed
circuits, make sure to look at each guard. Fixes bug 6397; bugfix
on 0.2.3.17-beta.
o Packaging (RPM):
- Update our default RPM spec files to work with mock and rpmbuild
on RHEL/Fedora. They have an updated set of dependencies and
conflicts, a fix for an ancient typo when creating the "_tor"
user, and better instructions. Thanks to Ondrej Mikle for the
patch series. Fixes bug 6043.
o Testing:
- Make it possible to set the TestingTorNetwork configuration
option using AlternateDirAuthority and AlternateBridgeAuthority
as an alternative to setting DirServer. Addresses ticket 6377.
o Documentation:
- Clarify the documentation for the Alternate*Authority options.
Fixes bug 6387.
- Fix some typos in the manpages. Patch from A. Costa. Fixes bug 6500.
o Code simplification and refactoring:
- Do not use SMARTLIST_FOREACH for any loop whose body exceeds
10 lines. Also, don't nest them. Doing so in the past has
led to hard-to-debug code. The new style is to use the
SMARTLIST_FOREACH_{BEGIN,END} pair. Addresses issue 6400.
Changes in version 0.2.3.19-rc - 2012-07-06
Tor 0.2.3.19-rc is the second release candidate for the Tor 0.2.3.x
series. It fixes the compile on Windows, reverts to a GeoIP database
that isn't as broken, and fixes a flow control bug that has been around
since the beginning of Tor.
o Major bugfixes:
- Fix a bug handling SENDME cells on nonexistent streams that could
result in bizarre window values. Report and patch contributed
pseudonymously. Fixes part of bug 6271. This bug was introduced
before the first Tor release, in svn commit r152.
- Revert to the May 1 2012 Maxmind GeoLite Country database. In the
June 2012 database, Maxmind marked many Tor relays as country "A1",
which will cause risky behavior for clients that set EntryNodes
or ExitNodes. Addresses bug 6334; bugfix on 0.2.3.17-beta.
- Instead of ENOBUFS on Windows, say WSAENOBUFS. Fixes compilation
on Windows. Fixes bug 6296; bugfix on 0.2.3.18-rc.
o Minor bugfixes:
- Fix wrong TCP port range in parse_port_range(). Fixes bug 6218;
bugfix on 0.2.1.10-alpha.
Changes in version 0.2.3.18-rc - 2012-06-28
Tor 0.2.3.18-rc is the first release candidate for the Tor 0.2.3.x
series. It fixes a few smaller bugs, but generally appears stable.
Please test it and let us know whether it is!
o Major bugfixes:
- Allow wildcarded mapaddress targets to be specified on the
controlport. Partially fixes bug 6244; bugfix on 0.2.3.9-alpha.
- Make our linker option detection code more robust against linkers
such as on FreeBSD 8, where a bad combination of options completes
successfully but makes an unrunnable binary. Fixes bug 6173;
bugfix on 0.2.3.17-beta.
o Minor bugfixes (on 0.2.2.x and earlier):
- Avoid a false positive in the util/threads unit test by increasing
the maximum timeout time. Fixes bug 6227; bugfix on 0.2.0.4-alpha.
- Replace "Sending publish request" log messages with "Launching
upload", so that they no longer confusingly imply that we're
sending something to a directory we might not even be connected
to yet. Fixes bug 3311; bugfix on 0.2.0.10-alpha.
- Make sure to set *socket_error in all error cases in
connection_connect(), so it can't produce a warning about
errno being zero from errno_to_orconn_end_reason(). Bugfix on
0.2.1.1-alpha; resolves ticket 6028.
- Downgrade "Got a certificate, but we already have it" log messages
from warning to info, except when we're a dirauth. Fixes bug 5238;
bugfix on 0.2.1.7-alpha.
- When checking for requested signatures on the latest consensus
before serving it to a client, make sure to check the right
consensus flavor. Bugfix on 0.2.2.6-alpha.
- Downgrade "eventdns rejected address" message to LOG_PROTOCOL_WARN.
Fixes bug 5932; bugfix on 0.2.2.7-alpha.
o Minor bugfixes (on 0.2.3.x):
- Make format_helper_exit_status() avoid unnecessary space padding
and stop confusing log_from_pipe(). Fixes ticket 5557; bugfix
on 0.2.3.1-alpha.
- Downgrade a message about cleaning the microdescriptor cache to
"info" from "notice". Fixes bug 6238; bugfix on 0.2.3.1-alpha.
- Log a BUG message at severity INFO if we have a networkstatus with
a missing entry for some microdescriptor. Continues on a patch
to 0.2.3.2-alpha.
- Improve the log message when a managed proxy fails to launch. Fixes
bug 5099; bugfix on 0.2.3.6-alpha.
- Don't do DNS lookups when parsing corrupted managed proxy protocol
messages. Fixes bug 6226; bugfix on 0.2.3.6-alpha.
- When formatting wildcarded address mappings for the controller,
be sure to include "*." as appropriate. Partially fixes bug 6244;
bugfix on 0.2.3.9-alpha.
- Avoid a warning caused by using strcspn() from glibc with clang 3.0.
Bugfix on 0.2.3.13-alpha.
- Stop logging messages about running with circuit timeout learning
enabled at severity LD_BUG. Fixes bug 6169; bugfix on 0.2.3.17-beta.
- Disable a spurious warning about reading on a marked and flushing
connection. We shouldn't be doing that, but apparently we
sometimes do. Fixes bug 6203; bugfix on 0.2.3.17-beta.
- Fix a bug that stopped AllowDotExit from working on addresses
that had an entry in the DNS cache. Fixes bug 6211; bugfix on
0.2.3.17-beta.
o Code simplification, refactoring, unit tests:
- Move tor_gettimeofday_cached() into compat_libevent.c, and use
Libevent's notion of cached time when possible.
- Remove duplicate code for invoking getrlimit() from control.c.
- Add a unit test for the environment_variable_names_equal function.
o Documentation:
- Document the --defaults-torrc option, and the new (in 0.2.3)
semantics for overriding, extending, and clearing lists of
options. Closes bug 4748.
Changes in version 0.2.3.17-beta - 2012-06-15
Tor 0.2.3.17-beta enables compiler and linker hardening by default,
gets our TLS handshake back on track for being able to blend in with
Firefox, fixes a big bug in 0.2.3.16-alpha that broke Tor's interaction
with Vidalia, and otherwise continues to get us closer to a release
candidate.
o Major features:
- Enable gcc and ld hardening by default. Resolves ticket 5210.
- Update TLS cipher list to match Firefox 8 and later. Resolves
ticket 4744.
- Implement the client side of proposal 198: remove support for
clients falsely claiming to support standard ciphersuites that
they can actually provide. As of modern OpenSSL versions, it's not
necessary to fake any standard ciphersuite, and doing so prevents
us from using better ciphersuites in the future, since servers
can't know whether an advertised ciphersuite is really supported or
not. Some hosts -- notably, ones with very old versions of OpenSSL
or where OpenSSL has been built with ECC disabled -- will stand
out because of this change; TBB users should not be affected.
o Major bugfixes:
- Change the default value for DynamicDHGroups (introduced in
0.2.3.9-alpha) to 0. This feature can make Tor relays less
identifiable by their use of the mod_ssl DH group, but at
the cost of some usability (#4721) and bridge tracing (#6087)
regressions. Resolves ticket 5598.
- Send a CRLF at the end of each STATUS_* control protocol event. This
bug tickled a bug in Vidalia which would make it freeze. Fixes
bug 6094; bugfix on 0.2.3.16-alpha.
o Minor bugfixes:
- Disable writing on marked-for-close connections when they are
blocked on bandwidth, to prevent busy-looping in Libevent. Fixes
bug 5263; bugfix on 0.0.2pre13, where we first added a special
case for flushing marked connections.
- Detect SSL handshake even when the initial attempt to write the
server hello fails. Fixes bug 4592; bugfix on 0.2.0.13-alpha.
- Change the AllowDotExit rules so they should actually work.
We now enforce AllowDotExit only immediately after receiving an
address via SOCKS or DNSPort: other sources are free to provide
.exit addresses after the resolution occurs. Fixes bug 3940;
bugfix on 0.2.2.1-alpha.
- Fix a (harmless) integer overflow in cell statistics reported by
some fast relays. Fixes bug 5849; bugfix on 0.2.2.1-alpha.
- Make sure circuitbuild.c checks LearnCircuitBuildTimeout in all the
right places and never depends on the consensus parameters or
computes adaptive timeouts when it is disabled. Fixes bug 5049;
bugfix on 0.2.2.14-alpha.
- When building Tor on Windows with -DUNICODE (not default), ensure
that error messages, filenames, and DNS server names are always
NUL-terminated when we convert them to a single-byte encoding.
Fixes bug 5909; bugfix on 0.2.2.16-alpha.
- Make Tor build correctly again with -DUNICODE -D_UNICODE defined.
Fixes bug 6097; bugfix on 0.2.2.16-alpha.
- Fix an edge case where TestingTorNetwork is set but the authorities
and relays all have an uptime of zero, where the private Tor network
could briefly lack support for hidden services. Fixes bug 3886;
bugfix on 0.2.2.18-alpha.
- Correct the manpage's descriptions for the default values of
DirReqStatistics and ExtraInfoStatistics. Fixes bug 2865; bugfix
on 0.2.3.1-alpha.
- Fix the documentation for the --hush and --quiet command line
options, which changed their behavior back in 0.2.3.3-alpha.
- Fix compilation warning with clang 3.1. Fixes bug 6141; bugfix on
0.2.3.11-alpha.
o Minor features:
- Rate-limit the "Weighted bandwidth is 0.000000" message, and add
more information to it, so that we can track it down in case it
returns again. Mitigates bug 5235.
- Check CircuitBuildTimeout and LearnCircuitBuildTimeout in
options_validate(); warn if LearnCircuitBuildTimeout is disabled and
CircuitBuildTimeout is set unreasonably low. Resolves ticket 5452.
- Warn the user when HTTPProxy, but no other proxy type, is
configured. This can cause surprising behavior: it doesn't send
all of Tor's traffic over the HTTPProxy -- it sends unencrypted
directory traffic only. Resolves ticket 4663.
- Issue a notice if a guard completes less than 40% of your circuits.
Threshold is configurable by torrc option PathBiasNoticeRate and
consensus parameter pb_noticepct. There is additional, off-by-
default code to disable guards which fail too many circuits.
Addresses ticket 5458.
- Update to the June 6 2012 Maxmind GeoLite Country database.
o Code simplifications and refactoring:
- Remove validate_pluggable_transports_config(): its warning
message is now handled by connection_or_connect().
Changes in version 0.2.2.37 - 2012-06-06
Tor 0.2.2.37 introduces a workaround for a critical renegotiation
bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
currently).
o Major bugfixes:
- Work around a bug in OpenSSL that broke renegotiation with TLS
1.1 and TLS 1.2. Without this workaround, all attempts to speak
the v2 Tor connection protocol when both sides were using OpenSSL
1.0.1 would fail. Resolves ticket 6033.
- When waiting for a client to renegotiate, don't allow it to add
any bytes to the input buffer. This fixes a potential DoS issue.
Fixes bugs 5934 and 6007; bugfix on 0.2.0.20-rc.
- Fix an edge case where if we fetch or publish a hidden service
descriptor, we might build a 4-hop circuit and then use that circuit
for exiting afterwards -- even if the new last hop doesn't obey our
ExitNodes config option. Fixes bug 5283; bugfix on 0.2.0.10-alpha.
o Minor bugfixes:
- Fix a build warning with Clang 3.1 related to our use of vasprintf.
Fixes bug 5969. Bugfix on 0.2.2.11-alpha.
o Minor features:
- Tell GCC and Clang to check for any errors in format strings passed
to the tor_v*(print|scan)f functions.
Changes in version 0.2.3.16-alpha - 2012-06-05
Tor 0.2.3.16-alpha introduces a workaround for a critical renegotiation
bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
currently). It also fixes a variety of smaller bugs and other cleanups
that get us closer to a release candidate.
o Major bugfixes (general):
- Work around a bug in OpenSSL that broke renegotiation with TLS
1.1 and TLS 1.2. Without this workaround, all attempts to speak
the v2 Tor connection protocol when both sides were using OpenSSL
1.0.1 would fail. Resolves ticket 6033.
- When waiting for a client to renegotiate, don't allow it to add
any bytes to the input buffer. This fixes a potential DoS issue.
Fixes bugs 5934 and 6007; bugfix on 0.2.0.20-rc.
- Pass correct OR address to managed proxies (like obfsproxy),
even when ORListenAddress is used. Fixes bug 4865; bugfix on
0.2.3.9-alpha.
- The advertised platform of a router now includes only its operating
system's name (e.g., "Linux", "Darwin", "Windows 7"), and not its
service pack level (for Windows) or its CPU architecture (for Unix).
We also no longer include the "git-XYZ" tag in the version. Resolves
part of bug 2988.
o Major bugfixes (clients):
- If we are unable to find any exit that supports our predicted ports,
stop calling them predicted, so that we don't loop and build
hopeless circuits indefinitely. Fixes bug 3296; bugfix on 0.0.9pre6,
which introduced predicted ports.
- Fix an edge case where if we fetch or publish a hidden service
descriptor, we might build a 4-hop circuit and then use that circuit
for exiting afterwards -- even if the new last hop doesn't obey our
ExitNodes config option. Fixes bug 5283; bugfix on 0.2.0.10-alpha.
- Check at each new consensus whether our entry guards were picked
long enough ago that we should rotate them. Previously, we only
did this check at startup, which could lead to us holding a guard
indefinitely. Fixes bug 5380; bugfix on 0.2.1.14-rc.
- When fetching a bridge descriptor from a bridge authority,
always do so anonymously, whether we have been able to open
circuits or not. Partial fix for bug 1938; bugfix on 0.2.0.7-alpha.
This behavior makes it *safer* to use UpdateBridgesFromAuthority,
but we'll need to wait for bug 6010 before it's actually usable.
o Major bugfixes (directory authorities):
- When computing weight parameters, behave more robustly in the
presence of a bad bwweightscale value. Previously, the authorities
would crash if they agreed on a sufficiently broken weight_scale
value: now, they use a reasonable default and carry on. Partial
fix for 5786; bugfix on 0.2.2.17-alpha.
- Check more thoroughly to prevent a rogue authority from
double-voting on any consensus directory parameter. Previously,
authorities would crash in this case if the total number of
votes for any parameter exceeded the number of active voters,
but would let it pass otherwise. Partial fix for bug 5786; bugfix
on 0.2.2.2-alpha.
o Minor features:
- Rate-limit log messages when asked to connect anonymously to
a private address. When these hit, they tended to hit fast and
often. Also, don't bother trying to connect to addresses that we
are sure will resolve to 127.0.0.1: getting 127.0.0.1 in a directory
reply makes us think we have been lied to, even when the address the
client tried to connect to was "localhost." Resolves ticket 2822.
- Allow packagers to insert an extra string in server descriptor
platform lines by setting the preprocessor variable TOR_BUILD_TAG.
Resolves the rest of ticket 2988.
- Raise the threshold of server descriptors needed (75%) and exit
server descriptors needed (50%) before we will declare ourselves
bootstrapped. This will make clients start building circuits a
little later, but makes the initially constructed circuits less
skewed and less in conflict with further directory fetches. Fixes
ticket 3196.
- Close any connection that sends unrecognized junk before the
handshake. Solves an issue noted in bug 4369.
- Improve log messages about managed transports. Resolves ticket 5070.
- Tag a bridge's descriptor as "never to be sent unencrypted".
This shouldn't matter, since bridges don't open non-anonymous
connections to the bridge authority and don't allow unencrypted
directory connections from clients, but we might as well make
sure. Closes bug 5139.
- Expose our view of whether we have gone dormant to the controller,
via a new "GETINFO dormant" value. Torbutton and other controllers
can use this to avoid doing periodic requests through Tor while
it's dormant (bug 4718). Fixes bug 5954.
- Tell GCC and Clang to check for any errors in format strings passed
to the tor_v*(print|scan)f functions.
- Update to the May 1 2012 Maxmind GeoLite Country database.
o Minor bugfixes (already included in 0.2.2.36):
- Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
Fixes bug 5346; bugfix on 0.0.8pre3.
- Correct parsing of certain date types in parse_http_time().
Without this patch, If-Modified-Since would behave
incorrectly. Fixes bug 5346; bugfix on 0.2.0.2-alpha. Patch from
Esteban Manchado Velázques.
- Make our number-parsing functions always treat too-large values
as an error, even when those values exceed the width of the
underlying type. Previously, if the caller provided these
functions with minima or maxima set to the extreme values of the
underlying integer type, these functions would return those
values on overflow rather than treating overflow as an error.
Fixes part of bug 5786; bugfix on 0.0.9.
- If we hit the error case where routerlist_insert() replaces an
existing (old) server descriptor, make sure to remove that
server descriptor from the old_routers list. Fix related to bug
1776. Bugfix on 0.2.2.18-alpha.
- Clarify the behavior of MaxCircuitDirtiness with hidden service
circuits. Fixes issue 5259.
o Minor bugfixes (coding cleanup, on 0.2.2.x and earlier):
- Prevent a null-pointer dereference when receiving a data cell
for a nonexistent stream when the circuit in question has an
empty deliver window. We don't believe this is triggerable,
since we don't currently allow deliver windows to become empty,
but the logic is tricky enough that it's better to make the code
robust. Fixes bug 5541; bugfix on 0.0.2pre14.
- Fix a memory leak when trying to launch a DNS request when the
network is disabled or the nameservers are unconfigurable. Fixes
bug 5916; bugfix on Tor 0.1.2.1-alpha (for the unconfigurable
nameserver case) and on 0.2.3.9-alpha (for the DisableNetwork case).
- Don't hold a Windows file handle open for every file mapping;
the file mapping handle is sufficient. Fixes bug 5951; bugfix on
0.1.2.1-alpha.
- Avoid O(n^2) performance characteristics when parsing a large
extrainfo cache. Fixes bug 5828; bugfix on 0.2.0.1-alpha.
- Format more doubles with %f, not %lf. Patch from grarpamp to make
Tor build correctly on older BSDs again. Fixes bug 3894; bugfix on
Tor 0.2.0.8-alpha.
- Make our replacement implementation of strtok_r() compatible with
the standard behavior of strtok_r(). Patch by nils. Fixes bug 5091;
bugfix on 0.2.2.1-alpha.
- Fix a NULL-pointer dereference on a badly formed
SETCIRCUITPURPOSE command. Found by mikeyc. Fixes bug 5796;
bugfix on 0.2.2.9-alpha.
- Fix a build warning with Clang 3.1 related to our use of vasprintf.
Fixes bug 5969. Bugfix on 0.2.2.11-alpha.
- Defensively refactor rend_mid_rendezvous() so that protocol
violations and length checks happen in the beginning. Fixes
bug 5645.
- Set _WIN32_WINNT to 0x0501 consistently throughout the code, so
that IPv6 stuff will compile on MSVC, and compilation issues
will be easier to track down. Fixes bug 5861.
o Minor bugfixes (correctness, on 0.2.2.x and earlier):
- Exit nodes now correctly report EADDRINUSE and EADDRNOTAVAIL as
resource exhaustion, so that clients can adjust their load to
try other exits. Fixes bug 4710; bugfix on 0.1.0.1-rc, which
started using END_STREAM_REASON_RESOURCELIMIT.
- Don't check for whether the address we're using for outbound
connections has changed until after the outbound connection has
completed. On Windows, getsockname() doesn't succeed until the
connection is finished. Fixes bug 5374; bugfix on 0.1.1.14-alpha.
- If the configuration tries to set MyFamily on a bridge, refuse to
do so, and warn about the security implications. Fixes bug 4657;
bugfix on 0.2.0.3-alpha.
- If the client fails to set a reasonable set of ciphersuites
during its v2 handshake renegotiation, allow the renegotiation to
continue nevertheless (i.e. send all the required certificates).
Fixes bug 4591; bugfix on 0.2.0.20-rc.
- When we receive a SIGHUP and the controller __ReloadTorrcOnSIGHUP
option is set to 0 (which Vidalia version 0.2.16 now does when
a SAVECONF attempt fails), perform other actions that SIGHUP
usually causes (like reopening the logs). Fixes bug 5095; bugfix
on 0.2.1.9-alpha.
- If we fail to write a microdescriptor to the disk cache, do not
continue replacing the old microdescriptor file. Fixes bug 2954;
bugfix on 0.2.2.6-alpha.
- Exit nodes don't need to fetch certificates for authorities that
they don't recognize; only directory authorities, bridges,
and caches need to do that. Fixes part of bug 2297; bugfix on
0.2.2.11-alpha.
- Correctly handle checking the permissions on the parent
directory of a control socket in the root directory. Bug found
by Esteban Manchado Velázquez. Fixes bug 5089; bugfix on Tor
0.2.2.26-beta.
- When told to add a bridge with the same digest as a preexisting
bridge but a different addr:port, change the addr:port as
requested. Previously we would not notice the change. Fixes half
of bug 5603; fix on 0.2.2.26-beta.
- End AUTHCHALLENGE error messages (in the control protocol) with
a CRLF. Fixes bug 5760; bugfix on 0.2.2.36 and 0.2.3.13-alpha.
o Minor bugfixes (on 0.2.3.x):
- Turn an assertion (that the number of handshakes received as a
server is not < 1) into a warning. Fixes bug 4873; bugfix on
0.2.3.1-alpha.
- Format IPv4 addresses correctly in ADDRMAP events. (Previously,
we had reversed them when the answer was cached.) Fixes bug
5723; bugfix on 0.2.3.1-alpha.
- Work correctly on Linux systems with accept4 support advertised in
their headers, but without accept4 support in the kernel. Fix
by murb. Fixes bug 5762; bugfix on 0.2.3.1-alpha.
- When told to add a bridge with the same addr:port as a preexisting
bridge but a different transport, change the transport as
requested. Previously we would not notice the change. Fixes half
of bug 5603; fix on 0.2.3.2-alpha.
- Avoid a "double-reply" warning when replying to a SOCKS request
with a parse error. Patch from Fabian Keil. Fixes bug 4108;
bugfix on 0.2.3.4-alpha.
- Fix a bug where a bridge authority crashes if it has seen no
directory requests when it's time to write statistics to disk.
Fixes bug 5891; bugfix on 0.2.3.6-alpha. Also fixes bug 5508 in
a better way.
- Don't try to open non-control listeners when DisableNetwork is set.
Previously, we'd open all listeners, then immediately close them.
Fixes bug 5604; bugfix on 0.2.3.9-alpha.
- Don't abort the managed proxy protocol if the managed proxy
sends us an unrecognized line; ignore it instead. Fixes bug
5910; bugfix on 0.2.3.9-alpha.
- Fix a compile warning in crypto.c when compiling with clang 3.1.
Fixes bug 5969, bugfix on 0.2.3.9-alpha.
- Fix a compilation issue on GNU Hurd, which doesn't have PATH_MAX.
Fixes bug 5355; bugfix on 0.2.3.11-alpha.
- Remove bogus definition of "_WIN32" from src/win32/orconfig.h, to
unbreak the MSVC build. Fixes bug 5858; bugfix on 0.2.3.12-alpha.
- Resolve numerous small warnings and build issues with MSVC. Resolves
bug 5859.
o Documentation fixes:
- Improve the manual's documentation for the NT Service command-line
options. Addresses ticket 3964.
- Clarify SessionGroup documentation slightly; resolves ticket 5437.
- Document the changes to the ORPort and DirPort options, and the
fact that {OR/Dir}ListenAddress is now unnecessary (and
therefore deprecated). Resolves ticket 5597.
o Removed files:
- Remove the torrc.bridge file: we don't use it for anything, and
it had become badly desynchronized from torrc.sample. Resolves
bug 5622.
Changes in version 0.2.2.36 - 2012-05-24
Tor 0.2.2.36 updates the addresses for two of the eight directory
authorities, fixes some potential anonymity and security issues,
and fixes several crash bugs.
Tor 0.2.1.x has reached its end-of-life. Those Tor versions have many
known flaws, and nobody should be using them. You should upgrade. If
you're using a Linux or BSD and its packages are obsolete, stop using
those packages and upgrade anyway.
o Directory authority changes:
- Change IP address for maatuska (v3 directory authority).
- Change IP address for ides (v3 directory authority), and rename
it to turtles.
o Security fixes:
- When building or running with any version of OpenSSL earlier
than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
versions have a bug (CVE-2011-4576) in which their block cipher
padding includes uninitialized data, potentially leaking sensitive
information to any peer with whom they make a SSLv3 connection. Tor
does not use SSL v3 by default, but a hostile client or server
could force an SSLv3 connection in order to gain information that
they shouldn't have been able to get. The best solution here is to
upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
to make sure that the bug can't happen.
- Never use a bridge or a controller-supplied node as an exit, even
if its exit policy allows it. Found by wanoskarnet. Fixes bug
5342. Bugfix on 0.1.1.15-rc (for controller-purpose descriptors)
and 0.2.0.3-alpha (for bridge-purpose descriptors).
- Only build circuits if we have a sufficient threshold of the total
descriptors that are marked in the consensus with the "Exit"
flag. This mitigates an attack proposed by wanoskarnet, in which
all of a client's bridges collude to restrict the exit nodes that
the client knows about. Fixes bug 5343.
- Provide controllers with a safer way to implement the cookie
authentication mechanism. With the old method, if another locally
running program could convince a controller that it was the Tor
process, then that program could trick the controller into telling
it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
authentication method uses a challenge-response approach to prevent
this attack. Fixes bug 5185; implements proposal 193.
o Major bugfixes:
- Avoid logging uninitialized data when unable to decode a hidden
service descriptor cookie. Fixes bug 5647; bugfix on 0.2.1.5-alpha.
- Avoid a client-side assertion failure when receiving an INTRODUCE2
cell on a general purpose circuit. Fixes bug 5644; bugfix on
0.2.1.6-alpha.
- Fix builds when the path to sed, openssl, or sha1sum contains
spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
on 0.2.2.1-alpha.
- Correct our replacements for the timeradd() and timersub() functions
on platforms that lack them (for example, Windows). The timersub()
function is used when expiring circuits, while timeradd() is
currently unused. Bug report and patch by Vektor. Fixes bug 4778;
bugfix on 0.2.2.24-alpha.
- Fix the SOCKET_OK test that we use to tell when socket
creation fails so that it works on Win64. Fixes part of bug 4533;
bugfix on 0.2.2.29-beta. Bug found by wanoskarnet.
o Minor bugfixes:
- Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
Fixes bug 5346; bugfix on 0.0.8pre3.
- Make our number-parsing functions always treat too-large values
as an error, even when those values exceed the width of the
underlying type. Previously, if the caller provided these
functions with minima or maxima set to the extreme values of the
underlying integer type, these functions would return those
values on overflow rather than treating overflow as an error.
Fixes part of bug 5786; bugfix on 0.0.9.
- Older Linux kernels erroneously respond to strange nmap behavior
by having accept() return successfully with a zero-length
socket. When this happens, just close the connection. Previously,
we would try harder to learn the remote address: but there was
no such remote address to learn, and our method for trying to
learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
on 0.1.0.3-rc. Reported and diagnosed by "r1eo".
- Correct parsing of certain date types in parse_http_time().
Without this patch, If-Modified-Since would behave
incorrectly. Fixes bug 5346; bugfix on 0.2.0.2-alpha. Patch from
Esteban Manchado Velázques.
- Change the BridgePassword feature (part of the "bridge community"
design, which is not yet implemented) to use a time-independent
comparison. The old behavior might have allowed an adversary
to use timing to guess the BridgePassword value. Fixes bug 5543;
bugfix on 0.2.0.14-alpha.
- Detect and reject certain misformed escape sequences in
configuration values. Previously, these values would cause us
to crash if received in a torrc file or over an authenticated
control port. Bug found by Esteban Manchado Velázquez, and
independently by Robert Connolly from Matta Consulting who further
noted that it allows a post-authentication heap overflow. Patch
by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
bugfix on 0.2.0.16-alpha.
- Fix a compile warning when using the --enable-openbsd-malloc
configure option. Fixes bug 5340; bugfix on 0.2.0.20-rc.
- During configure, detect when we're building with clang version
3.0 or lower and disable the -Wnormalized=id and -Woverride-init
CFLAGS. clang doesn't support them yet.
- When sending an HTTP/1.1 proxy request, include a Host header.
Fixes bug 5593; bugfix on 0.2.2.1-alpha.
- Fix a NULL-pointer dereference on a badly formed SETCIRCUITPURPOSE
command. Found by mikeyc. Fixes bug 5796; bugfix on 0.2.2.9-alpha.
- If we hit the error case where routerlist_insert() replaces an
existing (old) server descriptor, make sure to remove that
server descriptor from the old_routers list. Fix related to bug
1776. Bugfix on 0.2.2.18-alpha.
o Minor bugfixes (documentation and log messages):
- Fix a typo in a log message in rend_service_rendezvous_has_opened().
Fixes bug 4856; bugfix on Tor 0.0.6.
- Update "ClientOnly" man page entry to explain that there isn't
really any point to messing with it. Resolves ticket 5005.
- Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
directory authority option (introduced in Tor 0.2.2.34).
- Downgrade the "We're missing a certificate" message from notice
to info: people kept mistaking it for a real problem, whereas it
is seldom the problem even when we are failing to bootstrap. Fixes
bug 5067; bugfix on 0.2.0.10-alpha.
- Correctly spell "connect" in a log message on failure to create a
controlsocket. Fixes bug 4803; bugfix on 0.2.2.26-beta.
- Clarify the behavior of MaxCircuitDirtiness with hidden service
circuits. Fixes issue 5259.
o Minor features:
- Directory authorities now reject versions of Tor older than
0.2.1.30, and Tor versions between 0.2.2.1-alpha and 0.2.2.20-alpha
inclusive. These versions accounted for only a small fraction of
the Tor network, and have numerous known security issues. Resolves
issue 4788.
- Update to the May 1 2012 Maxmind GeoLite Country database.
o Feature removal:
- When sending or relaying a RELAY_EARLY cell, we used to convert
it to a RELAY cell if the connection was using the v1 link
protocol. This was a workaround for older versions of Tor, which
didn't handle RELAY_EARLY cells properly. Now that all supported
versions can handle RELAY_EARLY cells, and now that we're enforcing
the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
remove this workaround. Addresses bug 4786.
Changes in version 0.2.3.15-alpha - 2012-04-30
Tor 0.2.3.15-alpha fixes a variety of smaller bugs, including making
the development branch build on Windows again.
o Minor bugfixes (on 0.2.2.x and earlier):
- Make sure that there are no unhandled pending TLS errors before
reading from a TLS stream. We had checks in 0.1.0.3-rc, but
lost them in 0.1.0.5-rc when we refactored read_to_buf_tls().
Bugfix on 0.1.0.5-rc; fixes bug 4528.
- Fix an assert that directory authorities could trigger on sighup
during some configuration state transitions. We now don't treat
it as a fatal error when the new descriptor we just generated in
init_keys() isn't accepted. Fixes bug 4438; bugfix on 0.2.1.9-alpha.
- After we pick a directory mirror, we would refuse to use it if
it's in our ExcludeExitNodes list, resulting in mysterious failures
to bootstrap for people who just wanted to avoid exiting from
certain locations. Fixes bug 5623; bugfix on 0.2.2.25-alpha.
- When building with --enable-static-tor on OpenBSD, do not
erroneously attempt to link -lrt. Fixes bug 5103.
o Minor bugfixes (on 0.2.3.x):
- When Tor is built with kernel headers from a recent (last few
years) Linux kernel, do not fail to run on older (pre-2.6.28
Linux kernels). Fixes bug 5112; bugfix on 0.2.3.1-alpha.
- Fix cross-compilation issues with mingw. Bugfixes on 0.2.3.6-alpha
and 0.2.3.12-alpha.
- Fix compilation with miniupnpc version 1.6; patch from
Anthony G. Basile. Fixes bug 5434; bugfix on 0.2.3.12-alpha.
- Fix compilation with MSVC, which had defined MS_WINDOWS. Bugfix
on 0.2.3.13-alpha; found and fixed by Gisle Vanem.
- Fix compilation on platforms without unistd.h, or where environ
is defined in stdlib.h. Fixes bug 5704; bugfix on 0.2.3.13-alpha.
o Minor features:
- Directory authorities are now a little more lenient at accepting
older router descriptors, or newer router descriptors that don't
make big changes. This should help ameliorate past and future
issues where routers think they have uploaded valid descriptors,
but the authorities don't think so. Fix for ticket 2479.
- Make the code that clients use to detect an address change be
IPv6-aware, so that it won't fill clients' logs with error
messages when trying to get the IPv4 address of an IPv6
connection. Implements ticket 5537.
o Removed features:
- Remove the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays option;
authorities needed to use it for a while to keep the network working
as people upgraded to 0.2.1.31, 0.2.2.34, or 0.2.3.6-alpha, but
that was six months ago. As of now, it should no longer be needed
or used.
Changes in version 0.2.3.14-alpha - 2012-04-23
Tor 0.2.3.14-alpha fixes yet more bugs to get us closer to a release
candidate. It also dramatically speeds up AES: fast relays should
consider switching to the newer OpenSSL library.
o Directory authority changes:
- Change IP address for ides (v3 directory authority), and rename
it to turtles.
o Major bugfixes:
- Avoid logging uninitialized data when unable to decode a hidden
service descriptor cookie. Fixes bug 5647; bugfix on 0.2.1.5-alpha.
- Avoid a client-side assertion failure when receiving an INTRODUCE2
cell on a general purpose circuit. Fixes bug 5644; bugfix on
0.2.1.6-alpha.
- If authorities are unable to get a v2 consensus document from other
directory authorities, they no longer fall back to fetching
them from regular directory caches. Fixes bug 5635; bugfix on
0.2.2.26-beta, where routers stopped downloading v2 consensus
documents entirely.
- When we start a Tor client with a normal consensus already cached,
be willing to download a microdescriptor consensus. Fixes bug 4011;
fix on 0.2.3.1-alpha.
o Major features (performance):
- When built to use OpenSSL 1.0.1, and built for an x86 or x86_64
instruction set, take advantage of OpenSSL's AESNI, bitsliced, or
vectorized AES implementations as appropriate. These can be much,
much faster than other AES implementations.
o Minor bugfixes (0.2.2.x and earlier):
- Don't launch more than 10 service-side introduction-point circuits
for a hidden service in five minutes. Previously, we would consider
launching more introduction-point circuits if at least one second
had passed without any introduction-point circuits failing. Fixes
bug 4607; bugfix on 0.0.7pre1.
- Change the BridgePassword feature (part of the "bridge community"
design, which is not yet implemented) to use a time-independent
comparison. The old behavior might have allowed an adversary
to use timing to guess the BridgePassword value. Fixes bug 5543;
bugfix on 0.2.0.14-alpha.
- Enforce correct return behavior of tor_vsscanf() when the '%%'
pattern is used. Fixes bug 5558. Bugfix on 0.2.1.13.
- When sending an HTTP/1.1 proxy request, include a Host header.
Fixes bug 5593; bugfix on 0.2.2.1-alpha.
- Don't log that we have "decided to publish new relay descriptor"
unless we are actually publishing a descriptor. Fixes bug 3942;
bugfix on 0.2.2.28-beta.
o Minor bugfixes (0.2.3.x):
- Fix a bug where a bridge authority crashes (on a failed assert)
if it has seen no directory requests when it's time to write
statistics to disk. Fixes bug 5508. Bugfix on 0.2.3.6-alpha.
- Fix bug stomping on ORPort option NoListen and ignoring option
NoAdvertise. Fixes bug 5151; bugfix on 0.2.3.9-alpha.
- In the testsuite, provide a large enough buffer in the tor_sscanf
unit test. Otherwise we'd overrun that buffer and crash during
the unit tests. Found by weasel. Fixes bug 5449; bugfix on
0.2.3.12-alpha.
- Make sure we create the keys directory if it doesn't exist and we're
about to store the dynamic Diffie-Hellman parameters. Fixes bug
5572; bugfix on 0.2.3.13-alpha.
- Fix a small memory leak when trying to decode incorrect base16
authenticator during SAFECOOKIE authentication. Found by
Coverity Scan. Fixes CID 507. Bugfix on 0.2.3.13-alpha.
o Minor features:
- Add more information to a log statement that might help track down
bug 4091. If you're seeing "Bug: tor_addr_is_internal() called with a
non-IP address" messages (or any Bug messages, for that matter!),
please let us know about it.
- Relays now understand an IPv6 address when they get one from a
directory server. Resolves ticket 4875.
- Resolve IPv6 addresses in bridge and entry statistics to country
code "??" which means we at least count them. Resolves ticket 5053;
improves on 0.2.3.9-alpha.
- Update to the April 3 2012 Maxmind GeoLite Country database.
- Begin a doc/state-contents.txt file to explain the contents of
the Tor state file. Fixes bug 2987.
o Default torrc changes:
- Stop listing "socksport 9050" in torrc.sample. We open a socks
port on 9050 by default anyway, so this should not change anything
in practice.
- Stop mentioning the deprecated *ListenAddress options in
torrc.sample. Fixes bug 5438.
- Document unit of bandwidth related options in sample torrc.
Fixes bug 5621.
o Removed features:
- The "torify" script no longer supports the "tsocks" socksifier
tool, since tsocks doesn't support DNS and UDP right for Tor.
Everyone should be using torsocks instead. Fixes bugs 3530 and
5180. Based on a patch by "ugh".
o Code refactoring:
- Change the symmetric cipher interface so that creating and
initializing a stream cipher are no longer separate functions.
- Remove all internal support for unpadded RSA. We never used it, and
it would be a bad idea to start.
Changes in version 0.2.3.13-alpha - 2012-03-26
Tor 0.2.3.13-alpha fixes a variety of stability and correctness bugs
in managed pluggable transports, as well as providing other cleanups
that get us closer to a release candidate.
o Directory authority changes:
- Change IP address for maatuska (v3 directory authority).
o Security fixes:
- Provide controllers with a safer way to implement the cookie
authentication mechanism. With the old method, if another locally
running program could convince a controller that it was the Tor
process, then that program could trick the controller into telling
it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
authentication method uses a challenge-response approach to prevent
this attack. Fixes bug 5185, implements proposal 193.
- Never use a bridge or a controller-supplied node as an exit, even
if its exit policy allows it. Found by wanoskarnet. Fixes bug
5342. Bugfix on 0.1.1.15-rc (for controller-purpose descriptors)
and 0.2.0.3-alpha (for bridge-purpose descriptors).
- Only build circuits if we have a sufficient threshold of the total
descriptors that are marked in the consensus with the "Exit"
flag. This mitigates an attack proposed by wanoskarnet, in which
all of a client's bridges collude to restrict the exit nodes that
the client knows about. Fixes bug 5343.
o Major bugfixes (on Tor 0.2.3.x):
- Avoid an assert when managed proxies like obfsproxy are configured,
and we receive HUP signals or setconf attempts too rapidly. This
situation happens most commonly when Vidalia tries to attach to
Tor or tries to configure the Tor it's attached to. Fixes bug 5084;
bugfix on 0.2.3.6-alpha.
- Fix a relay-side pluggable transports bug where managed proxies were
unreachable from the Internet, because Tor asked them to bind on
localhost. Fixes bug 4725; bugfix on 0.2.3.9-alpha.
- Stop discarding command-line arguments when TestingTorNetwork
is set. Discovered by Kevin Bauer. Fixes bug 5373; bugfix on
0.2.3.9-alpha, where task 4552 added support for two layers of
torrc files.
- Resume allowing the unit tests to run in gdb. This was accidentally
made impossible when the DisableDebuggerAttachment option was
introduced. Fixes bug 5448; bugfix on 0.2.3.9-alpha.
- Resume building with nat-pmp support. Fixes bug 4955; bugfix on
0.2.3.11-alpha. Reported by Anthony G. Basile.
o Minor bugfixes (on 0.2.2.x and earlier):
- Ensure we don't cannibalize circuits that are longer than three hops
already, so we don't end up making circuits with 5 or more
hops. Patch contributed by wanoskarnet. Fixes bug 5231; bugfix on
0.1.0.1-rc which introduced cannibalization.
- Detect and reject certain misformed escape sequences in
configuration values. Previously, these values would cause us
to crash if received in a torrc file or over an authenticated
control port. Bug found by Esteban Manchado Velázquez, and
independently by Robert Connolly from Matta Consulting who further
noted that it allows a post-authentication heap overflow. Patch
by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
bugfix on 0.2.0.16-alpha.
- Fix a compile warning when using the --enable-openbsd-malloc
configure option. Fixes bug 5340; bugfix on 0.2.0.20-rc.
- Directory caches no longer refuse to clean out descriptors because
of missing v2 networkstatus documents, unless they're configured
to retrieve v2 networkstatus documents. Fixes bug 4838; bugfix on
0.2.2.26-beta. Patch by Daniel Bryg.
- Update to the latest version of the tinytest unit testing framework.
This includes a couple of bugfixes that can be relevant for
running forked unit tests on Windows, and removes all reserved
identifiers.
o Minor bugfixes (on 0.2.3.x):
- On a failed pipe() call, don't leak file descriptors. Fixes bug
4296; bugfix on 0.2.3.1-alpha.
- Spec conformance: on a v3 handshake, do not send a NETINFO cell
until after we have received a CERTS cell. Fixes bug 4361; bugfix
on 0.2.3.6-alpha. Patch by "frosty".
- When binding to an IPv6 address, set the IPV6_V6ONLY socket
option, so that the IP stack doesn't decide to use it for IPv4
too. Fixes bug 4760; bugfix on 0.2.3.9-alpha.
- Ensure that variables set in Tor's environment cannot override
environment variables that Tor passes to a managed
pluggable-transport proxy. Previously, Tor would pass every
variable in its environment to managed proxies along with the new
ones, in such a way that on many operating systems, the inherited
environment variables would override those which Tor tried to
explicitly set. Bugfix on 0.2.3.12-alpha for most Unixoid systems;
bugfix on 0.2.3.9-alpha for Windows.
o Minor features:
- A wide variety of new unit tests by Esteban Manchado Velázquez.
- Shorten links in the tor-exit-notice file. Patch by Christian Kujau.
- Update to the March 6 2012 Maxmind GeoLite Country database.
Changes in version 0.2.3.12-alpha - 2012-02-13
Tor 0.2.3.12-alpha lets fast exit relays scale better, allows clients
to use bridges that run Tor 0.2.2.x, and resolves several big bugs
when Tor is configured to use a pluggable transport like obfsproxy.
o Major bugfixes:
- Fix builds when the path to sed, openssl, or sha1sum contains
spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
on 0.2.2.1-alpha.
- Set the SO_REUSEADDR socket option before we call bind() on outgoing
connections. This change should allow busy exit relays to stop
running out of available sockets as quickly. Fixes bug 4950;
bugfix on 0.2.2.26-beta.
- Allow 0.2.3.x clients to use 0.2.2.x bridges. Previously the client
would ask the bridge for microdescriptors, which are only supported
in 0.2.3.x, and then fail to bootstrap when it didn't get the
answers it wanted. Fixes bug 4013; bugfix on 0.2.3.2-alpha.
- Properly set up obfsproxy's environment when in managed mode. The
Tor Browser Bundle needs LD_LIBRARY_PATH to be passed to obfsproxy,
and when you run your Tor as a daemon, there's no HOME. Fixes bugs
5076 and 5082; bugfix on 0.2.3.6-alpha.
o Minor features:
- Use the dead_strip option when building Tor on OS X. This reduces
binary size by almost 19% when linking openssl and libevent
statically, which we do for Tor Browser Bundle.
- Fix broken URLs in the sample torrc file, and tell readers about
the OutboundBindAddress, ExitPolicyRejectPrivate, and
PublishServerDescriptor options. Addresses bug 4652.
- Update to the February 7 2012 Maxmind GeoLite Country database.
o Minor bugfixes:
- Downgrade the "We're missing a certificate" message from notice
to info: people kept mistaking it for a real problem, whereas it
is seldom the problem even when we are failing to bootstrap. Fixes
bug 5067; bugfix on 0.2.0.10-alpha.
- Don't put "TOR_PT_EXTENDED_SERVER_PORT=127.0.0.1:4200" in a
managed pluggable transport server proxy's environment.
Previously, we would put it there, even though Tor doesn't
implement an 'extended server port' yet, and even though Tor
almost certainly isn't listening at that address. For now, we set
it to an empty string to avoid crashing older obfsproxies. Bugfix
on 0.2.3.6-alpha.
- Log the heartbeat message every HeartbeatPeriod seconds, not every
HeartbeatPeriod + 1 seconds. Fixes bug 4942; bugfix on
0.2.3.1-alpha. Bug reported by Scott Bennett.
- Calculate absolute paths correctly on Windows. Fixes bug 4973;
bugfix on 0.2.3.11-alpha.
- Update "ClientOnly" man page entry to explain that there isn't
really any point to messing with it. Resolves ticket 5005.
- Use the correct CVE number for CVE-2011-4576 in our comments and
log messages. Found by "fermenthor". Resolves bug 5066; bugfix on
0.2.3.11-alpha.
o Code simplifications and refactoring:
- Use the _WIN32 macro throughout our code to detect Windows.
(Previously we had used the obsolete 'WIN32' and the idiosyncratic
'MS_WINDOWS'.)
Changes in version 0.2.3.11-alpha - 2012-01-22
Tor 0.2.3.11-alpha marks feature-freeze for the 0.2.3 tree. It deploys
the last step of the plan to limit maximum circuit length, includes
a wide variety of hidden service performance and correctness fixes,
works around an OpenSSL security flaw if your distro is too stubborn
to upgrade, and fixes a bunch of smaller issues.
o Major features:
- Now that Tor 0.2.0.x is completely deprecated, enable the final
part of "Proposal 110: Avoiding infinite length circuits" by
refusing all circuit-extend requests that do not use a relay_early
cell. This change helps Tor resist a class of denial-of-service
attacks by limiting the maximum circuit length.
- Adjust the number of introduction points that a hidden service
will try to maintain based on how long its introduction points
remain in use and how many introductions they handle. Fixes
part of bug 3825.
- Try to use system facilities for enumerating local interface
addresses, before falling back to our old approach (which was
binding a UDP socket, and calling getsockname() on it). That
approach was scaring OS X users whose draconian firewall
software warned about binding to UDP sockets, regardless of
whether packets were sent. Now we try to use getifaddrs(),
SIOCGIFCONF, or GetAdaptersAddresses(), depending on what the
system supports. Resolves ticket 1827.
o Major security workaround:
- When building or running with any version of OpenSSL earlier
than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
versions have a bug (CVE-2011-4576) in which their block cipher
padding includes uninitialized data, potentially leaking sensitive
information to any peer with whom they make a SSLv3 connection. Tor
does not use SSL v3 by default, but a hostile client or server
could force an SSLv3 connection in order to gain information that
they shouldn't have been able to get. The best solution here is to
upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
to make sure that the bug can't happen.
o Major bugfixes:
- Fix the SOCKET_OK test that we use to tell when socket
creation fails so that it works on Win64. Fixes part of bug 4533;
bugfix on 0.2.2.29-beta. Bug found by wanoskarnet.
- Correct our replacements for the timeradd() and timersub() functions
on platforms that lack them (for example, Windows). The timersub()
function is used when expiring circuits, while timeradd() is
currently unused. Bug report and patch by Vektor. Fixes bug 4778;
bugfix on 0.2.2.24-alpha and 0.2.3.1-alpha.
- Do not use OpenSSL 1.0.0's counter mode: it has a critical bug
that was fixed in OpenSSL 1.0.0a. We test for the counter mode
bug at runtime, not compile time, because some distributions hack
their OpenSSL to mis-report its version. Fixes bug 4779; bugfix
on 0.2.3.9-alpha. Found by Pascal.
o Minor features (controller):
- Use absolute path names when reporting the torrc filename in the
control protocol, so a controller can more easily find the torrc
file. Resolves bug 1101.
- Extend the control protocol to report flags that control a circuit's
path selection in CIRC events and in replies to 'GETINFO
circuit-status'. Implements part of ticket 2411.
- Extend the control protocol to report the hidden service address
and current state of a hidden-service-related circuit in CIRC
events and in replies to 'GETINFO circuit-status'. Implements part
of ticket 2411.
- When reporting the path to the cookie file to the controller,
give an absolute path. Resolves ticket 4881.
- Allow controllers to request an event notification whenever a
circuit is cannibalized or its purpose is changed. Implements
part of ticket 3457.
- Include the creation time of a circuit in CIRC and CIRC2
control-port events and the list produced by the 'GETINFO
circuit-status' control-port command.
o Minor features (directory authorities):
- Directory authorities now reject versions of Tor older than
0.2.1.30, and Tor versions between 0.2.2.1-alpha and 0.2.2.20-alpha
inclusive. These versions accounted for only a small fraction of
the Tor network, and have numerous known security issues. Resolves
issue 4788.
- Authority operators can now vote for all relays in a given
set of countries to be BadDir/BadExit/Invalid/Rejected.
- Provide two consensus parameters (FastFlagMinThreshold and
FastFlagMaxThreshold) to control the range of allowable bandwidths
for the Fast directory flag. These allow authorities to run
experiments on appropriate requirements for being a "Fast" node.
The AuthDirFastGuarantee config value still applies. Implements
ticket 3946.
- Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
directory authority option (introduced in Tor 0.2.2.34).
o Minor features (other):
- Don't disable the DirPort when we cannot exceed our AccountingMax
limit during this interval because the effective bandwidthrate is
low enough. This is useful in a situation where AccountMax is only
used as an additional safeguard or to provide statistics.
- Prepend an informative header to generated dynamic_dh_params files.
- If EntryNodes are given, but UseEntryGuards is set to 0, warn that
EntryNodes will have no effect. Resolves issue 2571.
- Log more useful messages when we fail to disable debugger
attachment.
- Log which authority we're missing votes from when we go to fetch
them from the other auths.
- Log (at debug level) whenever a circuit's purpose is changed.
- Add missing documentation for the MaxClientCircuitsPending,
UseMicrodescriptors, UserspaceIOCPBuffers, and
_UseFilteringSSLBufferevents options, all introduced during
the 0.2.3.x series.
- Update to the January 3 2012 Maxmind GeoLite Country database.
o Minor bugfixes (hidden services):
- Don't close hidden service client circuits which have almost
finished connecting to their destination when they reach
the normal circuit-build timeout. Previously, we would close
introduction circuits which are waiting for an acknowledgement
from the introduction point, and rendezvous circuits which have
been specified in an INTRODUCE1 cell sent to a hidden service,
after the normal CBT. Now, we mark them as 'timed out', and launch
another rendezvous attempt in parallel. This behavior change can
be disabled using the new CloseHSClientCircuitsImmediatelyOnTimeout
option. Fixes part of bug 1297; bugfix on 0.2.2.2-alpha.
- Don't close hidden-service-side rendezvous circuits when they
reach the normal circuit-build timeout. This behavior change can
be disabled using the new
CloseHSServiceRendCircuitsImmediatelyOnTimeout option. Fixes the
remaining part of bug 1297; bugfix on 0.2.2.2-alpha.
- Make sure we never mark the wrong rendezvous circuit as having
had its introduction cell acknowledged by the introduction-point
relay. Previously, when we received an INTRODUCE_ACK cell on a
client-side hidden-service introduction circuit, we might have
marked a rendezvous circuit other than the one we specified in
the INTRODUCE1 cell as INTRO_ACKED, which would have produced
a warning message and interfered with the hidden service
connection-establishment process. Fixes bug 4759; bugfix on
0.2.3.3-alpha, when we added the stream-isolation feature which
might cause Tor to open multiple rendezvous circuits for the same
hidden service.
- Don't trigger an assertion failure when we mark a new client-side
hidden-service introduction circuit for close during the process
of creating it. Fixes bug 4796; bugfix on 0.2.3.6-alpha. Reported
by murb.
o Minor bugfixes (log messages):
- Correctly spell "connect" in a log message on failure to create a
controlsocket. Fixes bug 4803; bugfix on 0.2.2.26-beta and
0.2.3.2-alpha.
- Fix a typo in a log message in rend_service_rendezvous_has_opened().
Fixes bug 4856; bugfix on Tor 0.0.6.
- Fix the log message describing how we work around discovering
that our version is the ill-fated OpenSSL 0.9.8l. Fixes bug
4837; bugfix on 0.2.2.9-alpha.
- When logging about a disallowed .exit name, do not also call it
an "invalid onion address". Fixes bug 3325; bugfix on 0.2.2.9-alpha.
o Minor bugfixes (build fixes):
- During configure, detect when we're building with clang version
3.0 or lower and disable the -Wnormalized=id and -Woverride-init
CFLAGS. clang doesn't support them yet.
- During configure, search for library containing cos function as
libm lives in libcore on some platforms (BeOS/Haiku). Linking
against libm was hard-coded before. Fixes the first part of bug
4727; bugfix on 0.2.2.2-alpha. Patch and analysis by Martin Hebnes
Pedersen.
- Detect attempts to build Tor on (as yet hypothetical) versions
of Windows where sizeof(intptr_t) != sizeof(SOCKET). Partial
fix for bug 4533. Bugfix on 0.2.2.28-beta.
- Preprocessor directives should not be put inside the arguments
of a macro. This would break compilation with GCC releases prior
to version 3.3. We would never recommend such an old GCC version,
but it is apparently required for binary compatibility on some
platforms (namely, certain builds of Haiku). Fixes the other part
of bug 4727; bugfix on 0.2.3.3-alpha. Patch and analysis by Martin
Hebnes Pedersen.
o Minor bugfixes (other):
- Older Linux kernels erroneously respond to strange nmap behavior
by having accept() return successfully with a zero-length
socket. When this happens, just close the connection. Previously,
we would try harder to learn the remote address: but there was
no such remote address to learn, and our method for trying to
learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
on 0.1.0.3-rc. Reported and diagnosed by "r1eo".
- Fix null-pointer access that could occur if TLS allocation failed.
Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un". This was
erroneously listed as fixed in 0.2.3.9-alpha, but the fix had
accidentally been reverted.
- Fix our implementation of crypto_random_hostname() so it can't
overflow on ridiculously large inputs. (No Tor version has ever
provided this kind of bad inputs, but let's be correct in depth.)
Fixes bug 4413; bugfix on 0.2.2.9-alpha. Fix by Stephen Palmateer.
- Find more places in the code that should have been testing for
invalid sockets using the SOCKET_OK macro. Required for a fix
for bug 4533. Bugfix on 0.2.2.28-beta.
- Fix an assertion failure when, while running with bufferevents, a
connection finishes connecting after it is marked for close, but
before it is closed. Fixes bug 4697; bugfix on 0.2.3.1-alpha.
- test_util_spawn_background_ok() hardcoded the expected value
for ENOENT to 2. This isn't portable as error numbers are
platform specific, and particularly the hurd has ENOENT at
0x40000002. Construct expected string at runtime, using the correct
value for ENOENT. Fixes bug 4733; bugfix on 0.2.3.1-alpha.
- Reject attempts to disable DisableDebuggerAttachment while Tor is
running. Fixes bug 4650; bugfix on 0.2.3.9-alpha.
- Use an appropriate-width type for sockets in tor-fw-helper on
win64. Fixes bug 1983 at last. Bugfix on 0.2.3.9-alpha.
o Feature removal:
- When sending or relaying a RELAY_EARLY cell, we used to convert
it to a RELAY cell if the connection was using the v1 link
protocol. This was a workaround for older versions of Tor, which
didn't handle RELAY_EARLY cells properly. Now that all supported
versions can handle RELAY_EARLY cells, and now that we're enforcing
the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
remove this workaround. Addresses bug 4786.
o Code simplifications and refactoring:
- Use OpenSSL's built-in SSL_state_string_long() instead of our
own homebrewed ssl_state_to_string() replacement. Patch from
Emile Snyder. Fixes bug 4653.
- Use macros to indicate OpenSSL versions, so we don't need to worry
about accidental hexadecimal bit shifts.
- Remove some workaround code for OpenSSL 0.9.6 (which is no longer
supported).
- Convert more instances of tor_snprintf+tor_strdup into tor_asprintf.
- Use the smartlist_add_asprintf() alias more consistently.
- Use a TOR_INVALID_SOCKET macro when initializing a socket to an
invalid value, rather than just -1.
- Rename a handful of old identifiers, mostly related to crypto
structures and crypto functions. By convention, our "create an
object" functions are called "type_new()", our "free an object"
functions are called "type_free()", and our types indicate that
they are types only with a final "_t". But a handful of older
types and functions broke these rules, with function names like
"type_create" or "subsystem_op_type", or with type names like
type_env_t.
Changes in version 0.2.3.10-alpha - 2011-12-16
Tor 0.2.3.10-alpha fixes a critical heap-overflow security issue in
Tor's buffers code. Absolutely everybody should upgrade.
The bug relied on an incorrect calculation when making data continuous
in one of our IO buffers, if the first chunk of the buffer was
misaligned by just the wrong amount. The miscalculation would allow an
attacker to overflow a piece of heap-allocated memory. To mount this
attack, the attacker would need to either open a SOCKS connection to
Tor's SocksPort (usually restricted to localhost), or target a Tor
instance configured to make its connections through a SOCKS proxy
(which Tor does not do by default).
Good security practice requires that all heap-overflow bugs should be
presumed to be exploitable until proven otherwise, so we are treating
this as a potential code execution attack. Please upgrade immediately!
This bug does not affect bufferevents-based builds of Tor. Special
thanks to "Vektor" for reporting this issue to us!
This release also contains a few minor bugfixes for issues discovered
in 0.2.3.9-alpha.
o Major bugfixes:
- Fix a heap overflow bug that could occur when trying to pull
data into the first chunk of a buffer, when that chunk had
already had some data drained from it. Fixes CVE-2011-2778;
bugfix on 0.2.0.16-alpha. Reported by "Vektor".
o Minor bugfixes:
- If we can't attach streams to a rendezvous circuit when we
finish connecting to a hidden service, clear the rendezvous
circuit's stream-isolation state and try to attach streams
again. Previously, we cleared rendezvous circuits' isolation
state either too early (if they were freshly built) or not at all
(if they had been built earlier and were cannibalized). Bugfix on
0.2.3.3-alpha; fixes bug 4655.
- Fix compilation of the libnatpmp helper on non-Windows. Bugfix on
0.2.3.9-alpha; fixes bug 4691. Reported by Anthony G. Basile.
- Fix an assertion failure when a relay with accounting enabled
starts up while dormant. Fixes bug 4702; bugfix on 0.2.3.9-alpha.
o Minor features:
- Update to the December 6 2011 Maxmind GeoLite Country database.
Changes in version 0.2.2.35 - 2011-12-16
Tor 0.2.2.35 fixes a critical heap-overflow security issue in Tor's
buffers code. Absolutely everybody should upgrade.
The bug relied on an incorrect calculation when making data continuous
in one of our IO buffers, if the first chunk of the buffer was
misaligned by just the wrong amount. The miscalculation would allow an
attacker to overflow a piece of heap-allocated memory. To mount this
attack, the attacker would need to either open a SOCKS connection to
Tor's SocksPort (usually restricted to localhost), or target a Tor
instance configured to make its connections through a SOCKS proxy
(which Tor does not do by default).
Good security practice requires that all heap-overflow bugs should be
presumed to be exploitable until proven otherwise, so we are treating
this as a potential code execution attack. Please upgrade immediately!
This bug does not affect bufferevents-based builds of Tor. Special
thanks to "Vektor" for reporting this issue to us!
Tor 0.2.2.35 also fixes several bugs in previous versions, including
crash bugs for unusual configurations, and a long-term bug that
would prevent Tor from starting on Windows machines with draconian
AV software.
With this release, we remind everyone that 0.2.0.x has reached its
formal end-of-life. Those Tor versions have many known flaws, and
nobody should be using them. You should upgrade -- ideally to the
0.2.2.x series. If you're using a Linux or BSD and its packages are
obsolete, stop using those packages and upgrade anyway.
The Tor 0.2.1.x series is also approaching its end-of-life: it will no
longer receive support after some time in early 2012.
o Major bugfixes:
- Fix a heap overflow bug that could occur when trying to pull
data into the first chunk of a buffer, when that chunk had
already had some data drained from it. Fixes CVE-2011-2778;
bugfix on 0.2.0.16-alpha. Reported by "Vektor".
- Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
that it doesn't attempt to allocate a socketpair. This could cause
some problems on Windows systems with overzealous firewalls. Fix for
bug 4457; workaround for Libevent versions 2.0.1-alpha through
2.0.15-stable.
- If we mark an OR connection for close based on a cell we process,
don't process any further cells on it. We already avoid further
reads on marked-for-close connections, but now we also discard the
cells we'd already read. Fixes bug 4299; bugfix on 0.2.0.10-alpha,
which was the first version where we might mark a connection for
close based on processing a cell on it.
- Correctly sanity-check that we don't underflow on a memory
allocation (and then assert) for hidden service introduction
point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
bugfix on 0.2.1.5-alpha.
- Fix a memory leak when we check whether a hidden service
descriptor has any usable introduction points left. Fixes bug
4424. Bugfix on 0.2.2.25-alpha.
- Don't crash when we're running as a relay and don't have a GeoIP
file. Bugfix on 0.2.2.34; fixes bug 4340. This backports a fix
we've had in the 0.2.3.x branch already.
- When running as a client, do not print a misleading (and plain
wrong) log message that we're collecting "directory request"
statistics: clients don't collect statistics. Also don't create a
useless (because empty) stats file in the stats/ directory. Fixes
bug 4353; bugfix on 0.2.2.34.
o Minor bugfixes:
- Detect failure to initialize Libevent. This fix provides better
detection for future instances of bug 4457.
- Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
function. This was eating up hideously large amounts of time on some
busy servers. Fixes bug 4518; bugfix on 0.0.9.8.
- Resolve an integer overflow bug in smartlist_ensure_capacity().
Fixes bug 4230; bugfix on Tor 0.1.0.1-rc. Based on a patch by
Mansour Moufid.
- Don't warn about unused log_mutex in log.c when building with
--disable-threads using a recent GCC. Fixes bug 4437; bugfix on
0.1.0.6-rc which introduced --disable-threads.
- When configuring, starting, or stopping an NT service, stop
immediately after the service configuration attempt has succeeded
or failed. Fixes bug 3963; bugfix on 0.2.0.7-alpha.
- When sending a NETINFO cell, include the original address
received for the other side, not its canonical address. Found
by "troll_un"; fixes bug 4349; bugfix on 0.2.0.10-alpha.
- Fix a typo in a hibernation-related log message. Fixes bug 4331;
bugfix on 0.2.2.23-alpha; found by "tmpname0901".
- Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
occurred when a client tried to fetch a descriptor for a bridge
in ExcludeNodes. Fixes bug 4383; bugfix on 0.2.2.25-alpha.
- Backport fixes for a pair of compilation warnings on Windows.
Fixes bug 4521; bugfix on 0.2.2.28-beta and on 0.2.2.29-beta.
- If we had ever tried to call tor_addr_to_str on an address of
unknown type, we would have done a strdup on an uninitialized
buffer. Now we won't. Fixes bug 4529; bugfix on 0.2.1.3-alpha.
Reported by "troll_un".
- Correctly detect and handle transient lookup failures from
tor_addr_lookup. Fixes bug 4530; bugfix on 0.2.1.5-alpha.
Reported by "troll_un".
- Fix null-pointer access that could occur if TLS allocation failed.
Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un".
- Use tor_socket_t type for listener argument to accept(). Fixes bug
4535; bugfix on 0.2.2.28-beta. Found by "troll_un".
o Minor features:
- Add two new config options for directory authorities:
AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
that is always sufficient to satisfy the bandwidth requirement for
the Guard flag. Now it will be easier for researchers to simulate
Tor networks with different values. Resolves ticket 4484.
- When Tor ignores a hidden service specified in its configuration,
include the hidden service's directory in the warning message.
Previously, we would only tell the user that some hidden service
was ignored. Bugfix on 0.0.6; fixes bug 4426.
- Update to the December 6 2011 Maxmind GeoLite Country database.
o Packaging changes:
- Make it easier to automate expert package builds on Windows,
by removing an absolute path from makensis.exe command.
Changes in version 0.2.1.32 - 2011-12-16
Tor 0.2.1.32 backports important security and privacy fixes for
oldstable. This release is intended only for package maintainers and
others who cannot use the 0.2.2 stable series. All others should be
using Tor 0.2.2.x or newer.
The Tor 0.2.1.x series will reach formal end-of-life some time in
early 2012; we will stop releasing patches for it then.
o Major bugfixes (also included in 0.2.2.x):
- Correctly sanity-check that we don't underflow on a memory
allocation (and then assert) for hidden service introduction
point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
bugfix on 0.2.1.5-alpha.
- Fix a heap overflow bug that could occur when trying to pull
data into the first chunk of a buffer, when that chunk had
already had some data drained from it. Fixes CVE-2011-2778;
bugfix on 0.2.0.16-alpha. Reported by "Vektor".
o Minor features:
- Update to the December 6 2011 Maxmind GeoLite Country database.
Changes in version 0.2.3.9-alpha - 2011-12-08
Tor 0.2.3.9-alpha introduces initial IPv6 support for bridges, adds
a "DisableNetwork" security feature that bundles can use to avoid
touching the network until bridges are configured, moves forward on
the pluggable transport design, fixes a flaw in the hidden service
design that unnecessarily prevented clients with wrong clocks from
reaching hidden services, and fixes a wide variety of other issues.
o Major features:
- Clients can now connect to private bridges over IPv6. Bridges
still need at least one IPv4 address in order to connect to
other relays. Note that we don't yet handle the case where the
user has two bridge lines for the same bridge (one IPv4, one
IPv6). Implements parts of proposal 186.
- New "DisableNetwork" config option to prevent Tor from launching any
connections or accepting any connections except on a control port.
Bundles and controllers can set this option before letting Tor talk
to the rest of the network, for example to prevent any connections
to a non-bridge address. Packages like Orbot can also use this
option to instruct Tor to save power when the network is off.
- Clients and bridges can now be configured to use a separate
"transport" proxy. This approach makes the censorship arms race
easier by allowing bridges to use protocol obfuscation plugins. It
implements the "managed proxy" part of proposal 180 (ticket 3472).
- When using OpenSSL 1.0.0 or later, use OpenSSL's counter mode
implementation. It makes AES_CTR about 7% faster than our old one
(which was about 10% faster than the one OpenSSL used to provide).
Resolves ticket 4526.
- Add a "tor2web mode" for clients that want to connect to hidden
services non-anonymously (and possibly more quickly). As a safety
measure to try to keep users from turning this on without knowing
what they are doing, tor2web mode must be explicitly enabled at
compile time, and a copy of Tor compiled to run in tor2web mode
cannot be used as a normal Tor client. Implements feature 2553.
- Add experimental support for running on Windows with IOCP and no
kernel-space socket buffers. This feature is controlled by a new
"UserspaceIOCPBuffers" config option (off by default), which has
no effect unless Tor has been built with support for bufferevents,
is running on Windows, and has enabled IOCP. This may, in the long
run, help solve or mitigate bug 98.
- Use a more secure consensus parameter voting algorithm. Now at
least three directory authorities or a majority of them must
vote on a given parameter before it will be included in the
consensus. Implements proposal 178.
o Major bugfixes:
- Hidden services now ignore the timestamps on INTRODUCE2 cells.
They used to check that the timestamp was within 30 minutes
of their system clock, so they could cap the size of their
replay-detection cache, but that approach unnecessarily refused
service to clients with wrong clocks. Bugfix on 0.2.1.6-alpha, when
the v3 intro-point protocol (the first one which sent a timestamp
field in the INTRODUCE2 cell) was introduced; fixes bug 3460.
- Only use the EVP interface when AES acceleration is enabled,
to avoid a 5-7% performance regression. Resolves issue 4525;
bugfix on 0.2.3.8-alpha.
o Privacy/anonymity features (bridge detection):
- Make bridge SSL certificates a bit more stealthy by using random
serial numbers, in the same fashion as OpenSSL when generating
self-signed certificates. Implements ticket 4584.
- Introduce a new config option "DynamicDHGroups", enabled by
default, which provides each bridge with a unique prime DH modulus
to be used during SSL handshakes. This option attempts to help
against censors who might use the Apache DH modulus as a static
identifier for bridges. Addresses ticket 4548.
o Minor features (new/different config options):
- New configuration option "DisableDebuggerAttachment" (on by default)
to prevent basic debugging attachment attempts by other processes.
Supports Mac OS X and Gnu/Linux. Resolves ticket 3313.
- Allow MapAddress directives to specify matches against super-domains,
as in "MapAddress *.torproject.org *.torproject.org.torserver.exit".
Implements issue 933.
- Slightly change behavior of "list" options (that is, config
options that can appear more than once) when they appear both in
torrc and on the command line. Previously, the command-line options
would be appended to the ones from torrc. Now, the command-line
options override the torrc options entirely. This new behavior
allows the user to override list options (like exit policies and
ports to listen on) from the command line, rather than simply
appending to the list.
- You can get the old (appending) command-line behavior for "list"
options by prefixing the option name with a "+".
- You can remove all the values for a "list" option from the command
line without adding any new ones by prefixing the option name
with a "/".
- Add experimental support for a "defaults" torrc file to be parsed
before the regular torrc. Torrc options override the defaults file's
options in the same way that the command line overrides the torrc.
The SAVECONF controller command saves only those options which
differ between the current configuration and the defaults file. HUP
reloads both files. (Note: This is an experimental feature; its
behavior will probably be refined in future 0.2.3.x-alpha versions
to better meet packagers' needs.) Implements task 4552.
o Minor features:
- Try to make the introductory warning message that Tor prints on
startup more useful for actually finding help and information.
Resolves ticket 2474.
- Running "make version" now displays the version of Tor that
we're about to build. Idea from katmagic; resolves issue 4400.
- Expire old or over-used hidden service introduction points.
Required by fix for bug 3460.
- Move the replay-detection cache for the RSA-encrypted parts of
INTRODUCE2 cells to the introduction point data structures.
Previously, we would use one replay-detection cache per hidden
service. Required by fix for bug 3460.
- Reduce the lifetime of elements of hidden services' Diffie-Hellman
public key replay-detection cache from 60 minutes to 5 minutes. This
replay-detection cache is now used only to detect multiple
INTRODUCE2 cells specifying the same rendezvous point, so we can
avoid launching multiple simultaneous attempts to connect to it.
o Minor bugfixes (on Tor 0.2.2.x and earlier):
- Resolve an integer overflow bug in smartlist_ensure_capacity().
Fixes bug 4230; bugfix on Tor 0.1.0.1-rc. Based on a patch by
Mansour Moufid.
- Fix a minor formatting issue in one of tor-gencert's error messages.
Fixes bug 4574.
- Prevent a false positive from the check-spaces script, by disabling
the "whitespace between function name and (" check for functions
named 'op()'.
- Fix a log message suggesting that people contact a non-existent
email address. Fixes bug 3448.
- Fix null-pointer access that could occur if TLS allocation failed.
Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un".
- Report a real bootstrap problem to the controller on router
identity mismatch. Previously we just said "foo", which probably
made a lot of sense at the time. Fixes bug 4169; bugfix on
0.2.1.1-alpha.
- If we had ever tried to call tor_addr_to_str() on an address of
unknown type, we would have done a strdup() on an uninitialized
buffer. Now we won't. Fixes bug 4529; bugfix on 0.2.1.3-alpha.
Reported by "troll_un".
- Correctly detect and handle transient lookup failures from
tor_addr_lookup(). Fixes bug 4530; bugfix on 0.2.1.5-alpha.
Reported by "troll_un".
- Use tor_socket_t type for listener argument to accept(). Fixes bug
4535; bugfix on 0.2.2.28-beta. Found by "troll_un".
- Initialize conn->addr to a valid state in spawn_cpuworker(). Fixes
bug 4532; found by "troll_un".
o Minor bugfixes (on Tor 0.2.3.x):
- Fix a compile warning in tor_inet_pton(). Bugfix on 0.2.3.8-alpha;
fixes bug 4554.
- Don't send two ESTABLISH_RENDEZVOUS cells when opening a new
circuit for use as a hidden service client's rendezvous point.
Fixes bugs 4641 and 4171; bugfix on 0.2.3.3-alpha. Diagnosed
with help from wanoskarnet.
- Restore behavior of overriding SocksPort, ORPort, and similar
options from the command line. Bugfix on 0.2.3.3-alpha.
o Build fixes:
- Properly handle the case where the build-tree is not the same
as the source tree when generating src/common/common_sha1.i,
src/or/micro-revision.i, and src/or/or_sha1.i. Fixes bug 3953;
bugfix on 0.2.0.1-alpha.
o Code simplifications, cleanups, and refactorings:
- Remove the pure attribute from all functions that used it
previously. In many cases we assigned it incorrectly, because the
functions might assert or call impure functions, and we don't have
evidence that keeping the pure attribute is worthwhile. Implements
changes suggested in ticket 4421.
- Remove some dead code spotted by coverity. Fixes cid 432.
Bugfix on 0.2.3.1-alpha, closes bug 4637.
Changes in version 0.2.3.8-alpha - 2011-11-22
Tor 0.2.3.8-alpha fixes some crash and assert bugs, including a
socketpair-related bug that has been bothering Windows users. It adds
support to serve microdescriptors to controllers, so Vidalia's network
map can resume listing relays (once Vidalia implements its side),
and adds better support for hardware AES acceleration. Finally, it
starts the process of adjusting the bandwidth cutoff for getting the
"Fast" flag from 20KB to (currently) 32KB -- preliminary results show
that tiny relays harm performance more than they help network capacity.
o Major bugfixes:
- Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
that it doesn't attempt to allocate a socketpair. This could cause
some problems on Windows systems with overzealous firewalls. Fix for
bug 4457; workaround for Libevent versions 2.0.1-alpha through
2.0.15-stable.
- Correctly sanity-check that we don't underflow on a memory
allocation (and then assert) for hidden service introduction
point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
bugfix on 0.2.1.5-alpha.
- Remove the artificially low cutoff of 20KB to guarantee the Fast
flag. In the past few years the average relay speed has picked
up, and while the "top 7/8 of the network get the Fast flag" and
"all relays with 20KB or more of capacity get the Fast flag" rules
used to have the same result, now the top 7/8 of the network has
a capacity more like 32KB. Bugfix on 0.2.1.14-rc. Fixes bug 4489.
- Fix a rare assertion failure when checking whether a v0 hidden
service descriptor has any usable introduction points left, and
we don't have enough information to build a circuit to the first
intro point named in the descriptor. The HS client code in
0.2.3.x no longer uses v0 HS descriptors, but this assertion can
trigger on (and crash) v0 HS authorities. Fixes bug 4411.
Bugfix on 0.2.3.1-alpha; diagnosed by frosty_un.
- Make bridge authorities not crash when they are asked for their own
descriptor. Bugfix on 0.2.3.7-alpha, reported by Lucky Green.
- When running as a client, do not print a misleading (and plain
wrong) log message that we're collecting "directory request"
statistics: clients don't collect statistics. Also don't create a
useless (because empty) stats file in the stats/ directory. Fixes
bug 4353; bugfix on 0.2.2.34 and 0.2.3.7-alpha.
o Major features:
- Allow Tor controllers like Vidalia to obtain the microdescriptor
for a relay by identity digest or nickname. Previously,
microdescriptors were only available by their own digests, so a
controller would have to ask for and parse the whole microdescriptor
consensus in order to look up a single relay's microdesc. Fixes
bug 3832; bugfix on 0.2.3.1-alpha.
- Use OpenSSL's EVP interface for AES encryption, so that all AES
operations can use hardware acceleration (if present). Resolves
ticket 4442.
o Minor bugfixes (on 0.2.2.x and earlier):
- Detect failure to initialize Libevent. This fix provides better
detection for future instances of bug 4457.
- Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
function. This was eating up hideously large amounts of time on some
busy servers. Fixes bug 4518; bugfix on 0.0.9.8.
- Don't warn about unused log_mutex in log.c when building with
--disable-threads using a recent GCC. Fixes bug 4437; bugfix on
0.1.0.6-rc which introduced --disable-threads.
- Allow manual 'authenticate' commands to the controller interface
from netcat (nc) as well as telnet. We were rejecting them because
they didn't come with the expected whitespace at the end of the
command. Bugfix on 0.1.1.1-alpha; fixes bug 2893.
- Fix some (not actually triggerable) buffer size checks in usage of
tor_inet_ntop. Fixes bug 4434; bugfix on Tor 0.2.0.1-alpha. Patch
by Anders Sundman.
- Fix parsing of some corner-cases with tor_inet_pton(). Fixes
bug 4515; bugfix on 0.2.0.1-alpha; fix by Anders Sundman.
- When configuring, starting, or stopping an NT service, stop
immediately after the service configuration attempt has succeeded
or failed. Fixes bug 3963; bugfix on 0.2.0.7-alpha.
- When sending a NETINFO cell, include the original address
received for the other side, not its canonical address. Found
by "troll_un"; fixes bug 4349; bugfix on 0.2.0.10-alpha.
- Rename the bench_{aes,dmap} functions to test_*, so that tinytest
can pick them up when the tests aren't disabled. Bugfix on
0.2.2.4-alpha which introduced tinytest.
- Fix a memory leak when we check whether a hidden service
descriptor has any usable introduction points left. Fixes bug
4424. Bugfix on 0.2.2.25-alpha.
- Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
occurred when a client tried to fetch a descriptor for a bridge
in ExcludeNodes. Fixes bug 4383; bugfix on 0.2.2.25-alpha.
o Minor bugfixes (on 0.2.3.x):
- Make util unit tests build correctly with MSVC. Bugfix on
0.2.3.3-alpha. Patch by Gisle Vanem.
- Successfully detect AUTH_CHALLENGE cells with no recognized
authentication type listed. Fixes bug 4367; bugfix on 0.2.3.6-alpha.
Found by frosty_un.
- If a relay receives an AUTH_CHALLENGE cell it can't answer,
it should still send a NETINFO cell to allow the connection to
become open. Fixes bug 4368; fix on 0.2.3.6-alpha; bug found by
"frosty".
- Log less loudly when we get an invalid authentication certificate
from a source other than a directory authority: it's not unusual
to see invalid certs because of clock skew. Fixes bug 4370; bugfix
on 0.2.3.6-alpha.
- Tolerate servers with more clock skew in their authentication
certificates than previously. Fixes bug 4371; bugfix on
0.2.3.6-alpha.
- Fix a couple of compile warnings on Windows. Fixes bug 4469; bugfix
on 0.2.3.4-alpha and 0.2.3.6-alpha.
o Minor features:
- Add two new config options for directory authorities:
AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
that is always sufficient to satisfy the bandwidth requirement for
the Guard flag. Now it will be easier for researchers to simulate
Tor networks with different values. Resolves ticket 4484.
- When Tor ignores a hidden service specified in its configuration,
include the hidden service's directory in the warning message.
Previously, we would only tell the user that some hidden service
was ignored. Bugfix on 0.0.6; fixes bug 4426.
- When we fail to initialize Libevent, retry with IOCP disabled so we
don't need to turn on multi-threading support in Libevent, which in
turn requires a working socketpair(). This is a workaround for bug
4457, which affects Libevent versions from 2.0.1-alpha through
2.0.15-stable.
- Detect when we try to build on a platform that doesn't define
AF_UNSPEC to 0. We don't work there, so refuse to compile.
- Update to the November 1 2011 Maxmind GeoLite Country database.
o Packaging changes:
- Make it easier to automate expert package builds on Windows,
by removing an absolute path from makensis.exe command.
o Code simplifications and refactoring:
- Remove some redundant #include directives throughout the code.
Patch from Andrea Gelmini.
- Unconditionally use OpenSSL's AES implementation instead of our
old built-in one. OpenSSL's AES has been better for a while, and
relatively few servers should still be on any version of OpenSSL
that doesn't have good optimized assembly AES.
- Use the name "CERTS" consistently to refer to the new cell type;
we were calling it CERT in some places and CERTS in others.
o Testing:
- Numerous new unit tests for functions in util.c and address.c by
Anders Sundman.
- The long-disabled benchmark tests are now split into their own
./src/test/bench binary.
- The benchmark tests can now use more accurate timers than
gettimeofday() when such timers are available.
Changes in version 0.2.3.7-alpha - 2011-10-30
Tor 0.2.3.7-alpha fixes a crash bug in 0.2.3.6-alpha introduced by
the new v3 handshake. It also resolves yet another bridge address
enumeration issue.
o Major bugfixes:
- If we mark an OR connection for close based on a cell we process,
don't process any further cells on it. We already avoid further
reads on marked-for-close connections, but now we also discard the
cells we'd already read. Fixes bug 4299; bugfix on 0.2.0.10-alpha,
which was the first version where we might mark a connection for
close based on processing a cell on it.
- Fix a double-free bug that would occur when we received an invalid
certificate in a CERT cell in the new v3 handshake. Fixes bug 4343;
bugfix on 0.2.3.6-alpha.
- Bridges no longer include their address in NETINFO cells on outgoing
OR connections, to allow them to blend in better with clients.
Removes another avenue for enumerating bridges. Reported by
"troll_un". Fixes bug 4348; bugfix on 0.2.0.10-alpha, when NETINFO
cells were introduced.
o Trivial fixes:
- Fixed a typo in a hibernation-related log message. Fixes bug 4331;
bugfix on 0.2.2.23-alpha; found by "tmpname0901".
Changes in version 0.2.3.6-alpha - 2011-10-26
Tor 0.2.3.6-alpha includes the fix from 0.2.2.34 for a critical
anonymity vulnerability where an attacker can deanonymize Tor
users. Everybody should upgrade.
This release also features support for a new v3 connection handshake
protocol, and fixes to make hidden service connections more robust.
o Major features:
- Implement a new handshake protocol (v3) for authenticating Tors to
each other over TLS. It should be more resistant to fingerprinting
than previous protocols, and should require less TLS hacking for
future Tor implementations. Implements proposal 176.
- Allow variable-length padding cells to disguise the length of
Tor's TLS records. Implements part of proposal 184.
o Privacy/anonymity fixes (clients):
- Clients and bridges no longer send TLS certificate chains on
outgoing OR connections. Previously, each client or bridge would
use the same cert chain for all outgoing OR connections until
its IP address changes, which allowed any relay that the client
or bridge contacted to determine which entry guards it is using.
Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
- If a relay receives a CREATE_FAST cell on a TLS connection, it
no longer considers that connection as suitable for satisfying a
circuit EXTEND request. Now relays can protect clients from the
CVE-2011-2768 issue even if the clients haven't upgraded yet.
- Directory authorities no longer assign the Guard flag to relays
that haven't upgraded to the above "refuse EXTEND requests
to client connections" fix. Now directory authorities can
protect clients from the CVE-2011-2768 issue even if neither
the clients nor the relays have upgraded yet. There's a new
"GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
to let us transition smoothly, else tomorrow there would be no
guard relays.
o Major bugfixes (hidden services):
- Improve hidden service robustness: when an attempt to connect to
a hidden service ends, be willing to refetch its hidden service
descriptors from each of the HSDir relays responsible for them
immediately. Previously, we would not consider refetching the
service's descriptors from each HSDir for 15 minutes after the last
fetch, which was inconvenient if the hidden service was not running
during the first attempt. Bugfix on 0.2.0.18-alpha; fixes bug 3335.
- When one of a hidden service's introduction points appears to be
unreachable, stop trying it. Previously, we would keep trying
to build circuits to the introduction point until we lost the
descriptor, usually because the user gave up and restarted Tor.
Partly fixes bug 3825.
- Don't launch a useless circuit after failing to use one of a
hidden service's introduction points. Previously, we would
launch a new introduction circuit, but not set the hidden service
which that circuit was intended to connect to, so it would never
actually be used. A different piece of code would then create a
new introduction circuit correctly. Bug reported by katmagic and
found by Sebastian Hahn. Bugfix on 0.2.1.13-alpha; fixes bug 4212.
o Major bugfixes (other):
- Bridges now refuse CREATE or CREATE_FAST cells on OR connections
that they initiated. Relays could distinguish incoming bridge
connections from client connections, creating another avenue for
enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
Found by "frosty_un".
- Don't update the AccountingSoftLimitHitAt state file entry whenever
tor gets started. This prevents a wrong average bandwidth
estimate, which would cause relays to always start a new accounting
interval at the earliest possible moment. Fixes bug 2003; bugfix
on 0.2.2.7-alpha. Reported by BryonEldridge, who also helped
immensely in tracking this bug down.
- Fix a crash bug when changing node restrictions while a DNS lookup
is in-progress. Fixes bug 4259; bugfix on 0.2.2.25-alpha. Bugfix
by "Tey'".
o Minor bugfixes (on 0.2.2.x and earlier):
- When a hidden service turns an extra service-side introduction
circuit into a general-purpose circuit, free the rend_data and
intro_key fields first, so we won't leak memory if the circuit
is cannibalized for use as another service-side introduction
circuit. Bugfix on 0.2.1.7-alpha; fixes bug 4251.
- Rephrase the log message emitted if the TestSocks check is
successful. Patch from Fabian Keil; fixes bug 4094.
- Bridges now skip DNS self-tests, to act a little more stealthily.
Fixes bug 4201; bugfix on 0.2.0.3-alpha, which first introduced
bridges. Patch by "warms0x".
- Remove a confusing dollar sign from the example fingerprint in the
man page, and also make the example fingerprint a valid one. Fixes
bug 4309; bugfix on 0.2.1.3-alpha.
- Fix internal bug-checking logic that was supposed to catch
failures in digest generation so that it will fail more robustly
if we ask for a nonexistent algorithm. Found by Coverity Scan.
Bugfix on 0.2.2.1-alpha; fixes Coverity CID 479.
- Report any failure in init_keys() calls launched because our
IP address has changed. Spotted by Coverity Scan. Bugfix on
0.1.1.4-alpha; fixes CID 484.
o Minor bugfixes (on 0.2.3.x):
- Fix a bug in configure.in that kept it from building a configure
script with autoconf versions earlier than 2.61. Fixes bug 2430;
bugfix on 0.2.3.1-alpha.
- Don't warn users that they are exposing a client port to the
Internet if they have specified an RFC1918 address. Previously,
we would warn if the user had specified any non-loopback
address. Bugfix on 0.2.3.3-alpha. Fixes bug 4018; reported by Tas.
- Fix memory leaks in the failing cases of the new SocksPort and
ControlPort code. Found by Coverity Scan. Bugfix on 0.2.3.3-alpha;
fixes coverity CIDs 485, 486, and 487.
o Minor features:
- When a hidden service's introduction point times out, consider
trying it again during the next attempt to connect to the
HS. Previously, we would not try it again unless a newly fetched
descriptor contained it. Required by fixes for bugs 1297 and 3825.
- The next version of Windows will be called Windows 8, and it has
a major version of 6, minor version of 2. Correctly identify that
version instead of calling it "Very recent version". Resolves
ticket 4153; reported by funkstar.
- The Bridge Authority now writes statistics on how many bridge
descriptors it gave out in total, and how many unique descriptors
it gave out. It also lists how often the most and least commonly
fetched descriptors were given out, as well as the median and
25th/75th percentile. Implements tickets 4200 and 4294.
- Update to the October 4 2011 Maxmind GeoLite Country database.
o Code simplifications and refactoring:
- Remove some old code to remember statistics about which descriptors
we've served as a directory mirror. The feature wasn't used and
is outdated now that microdescriptors are around.
- Rename Tor functions that turn strings into addresses, so that
"parse" indicates that no hostname resolution occurs, and
"lookup" indicates that hostname resolution may occur. This
should help prevent mistakes in the future. Fixes bug 3512.
Changes in version 0.2.2.34 - 2011-10-26
Tor 0.2.2.34 fixes a critical anonymity vulnerability where an attacker
can deanonymize Tor users. Everybody should upgrade.
The attack relies on four components: 1) Clients reuse their TLS cert
when talking to different relays, so relays can recognize a user by
the identity key in her cert. 2) An attacker who knows the client's
identity key can probe each guard relay to see if that identity key
is connected to that guard relay right now. 3) A variety of active
attacks in the literature (starting from "Low-Cost Traffic Analysis
of Tor" by Murdoch and Danezis in 2005) allow a malicious website to
discover the guard relays that a Tor user visiting the website is using.
4) Clients typically pick three guards at random, so the set of guards
for a given user could well be a unique fingerprint for her. This
release fixes components #1 and #2, which is enough to block the attack;
the other two remain as open research problems. Special thanks to
"frosty_un" for reporting the issue to us!
Clients should upgrade so they are no longer recognizable by the TLS
certs they present. Relays should upgrade so they no longer allow a
remote attacker to probe them to test whether unpatched clients are
currently connected to them.
This release also fixes several vulnerabilities that allow an attacker
to enumerate bridge relays. Some bridge enumeration attacks still
remain; see for example proposal 188.
o Privacy/anonymity fixes (clients):
- Clients and bridges no longer send TLS certificate chains on
outgoing OR connections. Previously, each client or bridge would
use the same cert chain for all outgoing OR connections until
its IP address changes, which allowed any relay that the client
or bridge contacted to determine which entry guards it is using.
Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
- If a relay receives a CREATE_FAST cell on a TLS connection, it
no longer considers that connection as suitable for satisfying a
circuit EXTEND request. Now relays can protect clients from the
CVE-2011-2768 issue even if the clients haven't upgraded yet.
- Directory authorities no longer assign the Guard flag to relays
that haven't upgraded to the above "refuse EXTEND requests
to client connections" fix. Now directory authorities can
protect clients from the CVE-2011-2768 issue even if neither
the clients nor the relays have upgraded yet. There's a new
"GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
to let us transition smoothly, else tomorrow there would be no
guard relays.
o Privacy/anonymity fixes (bridge enumeration):
- Bridge relays now do their directory fetches inside Tor TLS
connections, like all the other clients do, rather than connecting
directly to the DirPort like public relays do. Removes another
avenue for enumerating bridges. Fixes bug 4115; bugfix on 0.2.0.35.
- Bridges relays now build circuits for themselves in a more similar
way to how clients build them. Removes another avenue for
enumerating bridges. Fixes bug 4124; bugfix on 0.2.0.3-alpha,
when bridges were introduced.
- Bridges now refuse CREATE or CREATE_FAST cells on OR connections
that they initiated. Relays could distinguish incoming bridge
connections from client connections, creating another avenue for
enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
Found by "frosty_un".
o Major bugfixes:
- Fix a crash bug when changing node restrictions while a DNS lookup
is in-progress. Fixes bug 4259; bugfix on 0.2.2.25-alpha. Bugfix
by "Tey'".
- Don't launch a useless circuit after failing to use one of a
hidden service's introduction points. Previously, we would
launch a new introduction circuit, but not set the hidden service
which that circuit was intended to connect to, so it would never
actually be used. A different piece of code would then create a
new introduction circuit correctly. Bug reported by katmagic and
found by Sebastian Hahn. Bugfix on 0.2.1.13-alpha; fixes bug 4212.
o Minor bugfixes:
- Change an integer overflow check in the OpenBSD_Malloc code so
that GCC is less likely to eliminate it as impossible. Patch
from Mansour Moufid. Fixes bug 4059.
- When a hidden service turns an extra service-side introduction
circuit into a general-purpose circuit, free the rend_data and
intro_key fields first, so we won't leak memory if the circuit
is cannibalized for use as another service-side introduction
circuit. Bugfix on 0.2.1.7-alpha; fixes bug 4251.
- Bridges now skip DNS self-tests, to act a little more stealthily.
Fixes bug 4201; bugfix on 0.2.0.3-alpha, which first introduced
bridges. Patch by "warms0x".
- Fix internal bug-checking logic that was supposed to catch
failures in digest generation so that it will fail more robustly
if we ask for a nonexistent algorithm. Found by Coverity Scan.
Bugfix on 0.2.2.1-alpha; fixes Coverity CID 479.
- Report any failure in init_keys() calls launched because our
IP address has changed. Spotted by Coverity Scan. Bugfix on
0.1.1.4-alpha; fixes CID 484.
o Minor bugfixes (log messages and documentation):
- Remove a confusing dollar sign from the example fingerprint in the
man page, and also make the example fingerprint a valid one. Fixes
bug 4309; bugfix on 0.2.1.3-alpha.
- The next version of Windows will be called Windows 8, and it has
a major version of 6, minor version of 2. Correctly identify that
version instead of calling it "Very recent version". Resolves
ticket 4153; reported by funkstar.
- Downgrade log messages about circuit timeout calibration from
"notice" to "info": they don't require or suggest any human
intervention. Patch from Tom Lowenthal. Fixes bug 4063;
bugfix on 0.2.2.14-alpha.
o Minor features:
- Turn on directory request statistics by default and include them in
extra-info descriptors. Don't break if we have no GeoIP database.
Backported from 0.2.3.1-alpha; implements ticket 3951.
- Update to the October 4 2011 Maxmind GeoLite Country database.
Changes in version 0.2.1.31 - 2011-10-26
Tor 0.2.1.31 backports important security and privacy fixes for
oldstable. This release is intended only for package maintainers and
others who cannot use the 0.2.2 stable series. All others should be
using Tor 0.2.2.x or newer.
o Security fixes (also included in 0.2.2.x):
- Replace all potentially sensitive memory comparison operations
with versions whose runtime does not depend on the data being
compared. This will help resist a class of attacks where an
adversary can use variations in timing information to learn
sensitive data. Fix for one case of bug 3122. (Safe memcmp
implementation by Robert Ransom based partially on code by DJB.)
- Fix an assert in parsing router descriptors containing IPv6
addresses. This one took down the directory authorities when
somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
o Privacy/anonymity fixes (also included in 0.2.2.x):
- Clients and bridges no longer send TLS certificate chains on
outgoing OR connections. Previously, each client or bridge would
use the same cert chain for all outgoing OR connections until
its IP address changes, which allowed any relay that the client
or bridge contacted to determine which entry guards it is using.
Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
- If a relay receives a CREATE_FAST cell on a TLS connection, it
no longer considers that connection as suitable for satisfying a
circuit EXTEND request. Now relays can protect clients from the
CVE-2011-2768 issue even if the clients haven't upgraded yet.
- Bridges now refuse CREATE or CREATE_FAST cells on OR connections
that they initiated. Relays could distinguish incoming bridge
connections from client connections, creating another avenue for
enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
Found by "frosty_un".
- When receiving a hidden service descriptor, check that it is for
the hidden service we wanted. Previously, Tor would store any
hidden service descriptors that a directory gave it, whether it
wanted them or not. This wouldn't have let an attacker impersonate
a hidden service, but it did let directories pre-seed a client
with descriptors that it didn't want. Bugfix on 0.0.6.
- Avoid linkability based on cached hidden service descriptors: forget
all hidden service descriptors cached as a client when processing a
SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
- Make the bridge directory authority refuse to answer directory
requests for "all" descriptors. It used to include bridge
descriptors in its answer, which was a major information leak.
Found by "piebeer". Bugfix on 0.2.0.3-alpha.
- Don't attach new streams to old rendezvous circuits after SIGNAL
NEWNYM. Previously, we would keep using an existing rendezvous
circuit if it remained open (i.e. if it were kept open by a
long-lived stream, or if a new stream were attached to it before
Tor could notice that it was old and no longer in use). Bugfix on
0.1.1.15-rc; fixes bug 3375.
o Minor bugfixes (also included in 0.2.2.x):
- When we restart our relay, we might get a successful connection
from the outside before we've started our reachability tests,
triggering a warning: "ORPort found reachable, but I have no
routerinfo yet. Failing to inform controller of success." This
bug was harmless unless Tor is running under a controller
like Vidalia, in which case the controller would never get a
REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
fixes bug 1172.
- Build correctly on OSX with zlib 1.2.4 and higher with all warnings
enabled. Fixes bug 1526.
- Remove undocumented option "-F" from tor-resolve: it hasn't done
anything since 0.2.1.16-rc.
- Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
None of the cases where we did this before were wrong, but by making
this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
- Fix a rare crash bug that could occur when a client was configured
with a large number of bridges. Fixes bug 2629; bugfix on
0.2.1.2-alpha. Bugfix by trac user "shitlei".
- Correct the warning displayed when a rendezvous descriptor exceeds
the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
John Brooks.
- Fix an uncommon assertion failure when running with DNSPort under
heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
- When warning about missing zlib development packages during compile,
give the correct package names. Bugfix on 0.2.0.1-alpha.
- Require that introduction point keys and onion keys have public
exponent 65537. Bugfix on 0.2.0.10-alpha.
- Do not crash when our configuration file becomes unreadable, for
example due to a permissions change, between when we start up
and when a controller calls SAVECONF. Fixes bug 3135; bugfix
on 0.0.9pre6.
- Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
Fixes bug 3208.
- Always NUL-terminate the sun_path field of a sockaddr_un before
passing it to the kernel. (Not a security issue: kernels are
smart enough to reject bad sockaddr_uns.) Found by Coverity;
CID #428. Bugfix on Tor 0.2.0.3-alpha.
- Don't stack-allocate the list of supplementary GIDs when we're
about to log them. Stack-allocating NGROUPS_MAX gid_t elements
could take up to 256K, which is way too much stack. Found by
Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
o Minor bugfixes (only in 0.2.1.x):
- Resume using micro-version numbers in 0.2.1.x: our Debian packages
rely on them. Bugfix on 0.2.1.30.
- Use git revisions instead of svn revisions when generating our
micro-version numbers. Bugfix on 0.2.1.15-rc; fixes bug 2402.
o Minor features (also included in 0.2.2.x):
- Adjust the expiration time on our SSL session certificates to
better match SSL certs seen in the wild. Resolves ticket 4014.
- Allow nameservers with IPv6 address. Resolves bug 2574.
- Update to the October 4 2011 Maxmind GeoLite Country database.
Changes in version 0.2.3.5-alpha - 2011-09-28
Tor 0.2.3.5-alpha fixes two bugs that make it possible to enumerate
bridge relays; fixes an assertion error that many users started hitting
today; and adds the ability to refill token buckets more often than
once per second, allowing significant performance improvements.
o Security fixes:
- Bridge relays now do their directory fetches inside Tor TLS
connections, like all the other clients do, rather than connecting
directly to the DirPort like public relays do. Removes another
avenue for enumerating bridges. Fixes bug 4115; bugfix on 0.2.0.35.
- Bridges relays now build circuits for themselves in a more similar
way to how clients build them. Removes another avenue for
enumerating bridges. Fixes bug 4124; bugfix on 0.2.0.3-alpha,
when bridges were introduced.
o Major bugfixes:
- Fix an "Assertion md->held_by_node == 1 failed" error that could
occur when the same microdescriptor was referenced by two node_t
objects at once. Fix for bug 4118; bugfix on Tor 0.2.3.1-alpha.
o Major features (networking):
- Add a new TokenBucketRefillInterval option to refill token buckets
more frequently than once per second. This should improve network
performance, alleviate queueing problems, and make traffic less
bursty. Implements proposal 183; closes ticket 3630. Design by
Florian Tschorsch and Björn Scheuermann; implementation by
Florian Tschorsch.
o Minor bugfixes:
- Change an integer overflow check in the OpenBSD_Malloc code so
that GCC is less likely to eliminate it as impossible. Patch
from Mansour Moufid. Fixes bug 4059.
o Minor bugfixes (usability):
- Downgrade log messages about circuit timeout calibration from
"notice" to "info": they don't require or suggest any human
intervention. Patch from Tom Lowenthal. Fixes bug 4063;
bugfix on 0.2.2.14-alpha.
o Minor features (diagnostics):
- When the system call to create a listener socket fails, log the
error message explaining why. This may help diagnose bug 4027.
Changes in version 0.2.3.4-alpha - 2011-09-13
Tor 0.2.3.4-alpha includes the fixes from 0.2.2.33, including a slight
tweak to Tor's TLS handshake that makes relays and bridges that run
this new version reachable from Iran again. It also fixes a few new
bugs in 0.2.3.x, and teaches relays to recognize when they're not
listed in the network consensus and republish.
o Major bugfixes (also part of 0.2.2.33):
- Avoid an assertion failure when reloading a configuration with
TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
3923; bugfix on 0.2.2.25-alpha.
o Minor features (security, also part of 0.2.2.33):
- Check for replays of the public-key encrypted portion of an
INTRODUCE1 cell, in addition to the current check for replays of
the g^x value. This prevents a possible class of active attacks
by an attacker who controls both an introduction point and a
rendezvous point, and who uses the malleability of AES-CTR to
alter the encrypted g^x portion of the INTRODUCE1 cell. We think
that these attacks are infeasible (requiring the attacker to send
on the order of zettabytes of altered cells in a short interval),
but we'd rather block them off in case there are any classes of
this attack that we missed. Reported by Willem Pinckaers.
o Minor features (also part of 0.2.2.33):
- Adjust the expiration time on our SSL session certificates to
better match SSL certs seen in the wild. Resolves ticket 4014.
- Change the default required uptime for a relay to be accepted as
a HSDir (hidden service directory) from 24 hours to 25 hours.
Improves on 0.2.0.10-alpha; resolves ticket 2649.
- Add a VoteOnHidServDirectoriesV2 config option to allow directory
authorities to abstain from voting on assignment of the HSDir
consensus flag. Related to bug 2649.
- Update to the September 6 2011 Maxmind GeoLite Country database.
o Minor bugfixes (also part of 0.2.2.33):
- Demote the 'replay detected' log message emitted when a hidden
service receives the same Diffie-Hellman public key in two different
INTRODUCE2 cells to info level. A normal Tor client can cause that
log message during its normal operation. Bugfix on 0.2.1.6-alpha;
fixes part of bug 2442.
- Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
level. There is nothing that a hidden service's operator can do
to fix its clients' clocks. Bugfix on 0.2.1.6-alpha; fixes part
of bug 2442.
- Clarify a log message specifying the characters permitted in
HiddenServiceAuthorizeClient client names. Previously, the log
message said that "[A-Za-z0-9+-_]" were permitted; that could have
given the impression that every ASCII character between "+" and "_"
was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on 0.2.1.5-alpha.
o Build fixes (also part of 0.2.2.33):
- Clean up some code issues that prevented Tor from building on older
BSDs. Fixes bug 3894; reported by "grarpamp".
- Search for a platform-specific version of "ar" when cross-compiling.
Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
o Major bugfixes:
- Fix a bug where the SocksPort option (for example) would get
ignored and replaced by the default if a SocksListenAddress
option was set. Bugfix on 0.2.3.3-alpha; fixes bug 3936. Fix by
Fabian Keil.
o Major features:
- Relays now try regenerating and uploading their descriptor more
frequently if they are not listed in the consensus, or if the
version of their descriptor listed in the consensus is too
old. This fix should prevent situations where a server declines
to re-publish itself because it has done so too recently, even
though the authorities decided not to list its recent-enough
descriptor. Fix for bug 3327.
o Minor features:
- Relays now include a reason for regenerating their descriptors
in an HTTP header when uploading to the authorities. This will
make it easier to debug descriptor-upload issues in the future.
- When starting as root and then changing our UID via the User
control option, and we have a ControlSocket configured, make sure
that the ControlSocket is owned by the same account that Tor will
run under. Implements ticket 3421; fix by Jérémy Bobbio.
o Minor bugfixes:
- Abort if tor_vasprintf fails in connection_printf_to_buf (a
utility function used in the control-port code). This shouldn't
ever happen unless Tor is completely out of memory, but if it did
happen and Tor somehow recovered from it, Tor could have sent a log
message to a control port in the middle of a reply to a controller
command. Fixes part of bug 3428; bugfix on 0.1.2.3-alpha.
- Make 'FetchUselessDescriptors' cause all descriptor types and
all consensus types (including microdescriptors) to get fetched.
Fixes bug 3851; bugfix on 0.2.3.1-alpha.
o Code refactoring:
- Make a new "entry connection" struct as an internal subtype of "edge
connection", to simplify the code and make exit connections smaller.
Changes in version 0.2.2.33 - 2011-09-13
Tor 0.2.2.33 fixes several bugs, and includes a slight tweak to Tor's
TLS handshake that makes relays and bridges that run this new version
reachable from Iran again.
o Major bugfixes:
- Avoid an assertion failure when reloading a configuration with
TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
3923; bugfix on 0.2.2.25-alpha.
o Minor features (security):
- Check for replays of the public-key encrypted portion of an
INTRODUCE1 cell, in addition to the current check for replays of
the g^x value. This prevents a possible class of active attacks
by an attacker who controls both an introduction point and a
rendezvous point, and who uses the malleability of AES-CTR to
alter the encrypted g^x portion of the INTRODUCE1 cell. We think
that these attacks are infeasible (requiring the attacker to send
on the order of zettabytes of altered cells in a short interval),
but we'd rather block them off in case there are any classes of
this attack that we missed. Reported by Willem Pinckaers.
o Minor features:
- Adjust the expiration time on our SSL session certificates to
better match SSL certs seen in the wild. Resolves ticket 4014.
- Change the default required uptime for a relay to be accepted as
a HSDir (hidden service directory) from 24 hours to 25 hours.
Improves on 0.2.0.10-alpha; resolves ticket 2649.
- Add a VoteOnHidServDirectoriesV2 config option to allow directory
authorities to abstain from voting on assignment of the HSDir
consensus flag. Related to bug 2649.
- Update to the September 6 2011 Maxmind GeoLite Country database.
o Minor bugfixes (documentation and log messages):
- Correct the man page to explain that HashedControlPassword and
CookieAuthentication can both be set, in which case either method
is sufficient to authenticate to Tor. Bugfix on 0.2.0.7-alpha,
when we decided to allow these config options to both be set. Issue
raised by bug 3898.
- Demote the 'replay detected' log message emitted when a hidden
service receives the same Diffie-Hellman public key in two different
INTRODUCE2 cells to info level. A normal Tor client can cause that
log message during its normal operation. Bugfix on 0.2.1.6-alpha;
fixes part of bug 2442.
- Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
level. There is nothing that a hidden service's operator can do
to fix its clients' clocks. Bugfix on 0.2.1.6-alpha; fixes part
of bug 2442.
- Clarify a log message specifying the characters permitted in
HiddenServiceAuthorizeClient client names. Previously, the log
message said that "[A-Za-z0-9+-_]" were permitted; that could have
given the impression that every ASCII character between "+" and "_"
was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on 0.2.1.5-alpha.
o Build fixes:
- Provide a substitute implementation of lround() for MSVC, which
apparently lacks it. Patch from Gisle Vanem.
- Clean up some code issues that prevented Tor from building on older
BSDs. Fixes bug 3894; reported by "grarpamp".
- Search for a platform-specific version of "ar" when cross-compiling.
Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
Changes in version 0.2.3.3-alpha - 2011-09-01
Tor 0.2.3.3-alpha adds a new "stream isolation" feature to improve Tor's
security, and provides client-side support for the microdescriptor
and optimistic data features introduced earlier in the 0.2.3.x
series. It also includes numerous critical bugfixes in the (optional)
bufferevent-based networking backend.
o Major features (stream isolation):
- You can now configure Tor so that streams from different
applications are isolated on different circuits, to prevent an
attacker who sees your streams as they leave an exit node from
linking your sessions to one another. To do this, choose some way
to distinguish the applications: have them connect to different
SocksPorts, or have one of them use SOCKS4 while the other uses
SOCKS5, or have them pass different authentication strings to the
SOCKS proxy. Then, use the new SocksPort syntax to configure the
degree of isolation you need. This implements Proposal 171.
- There's a new syntax for specifying multiple client ports (such as
SOCKSPort, TransPort, DNSPort, NATDPort): you can now just declare
multiple *Port entries with full addr:port syntax on each.
The old *ListenAddress format is still supported, but you can't
mix it with the new *Port syntax.
o Major features (other):
- Enable microdescriptor fetching by default for clients. This allows
clients to download a much smaller amount of directory information.
To disable it (and go back to the old-style consensus and
descriptors), set "UseMicrodescriptors 0" in your torrc file.
- Tor's firewall-helper feature, introduced in 0.2.3.1-alpha (see the
"PortForwarding" config option), now supports Windows.
- When using an exit relay running 0.2.3.x, clients can now
"optimistically" send data before the exit relay reports that
the stream has opened. This saves a round trip when starting
connections where the client speaks first (such as web browsing).
This behavior is controlled by a consensus parameter (currently
disabled). To turn it on or off manually, use the "OptimisticData"
torrc option. Implements proposal 181; code by Ian Goldberg.
o Major bugfixes (bufferevents, fixes on 0.2.3.1-alpha):
- When using IOCP on Windows, we need to enable Libevent windows
threading support.
- The IOCP backend now works even when the user has not specified
the (internal, debugging-only) _UseFilteringSSLBufferevents option.
Fixes part of bug 3752.
- Correctly record the bytes we've read and written when using
bufferevents, so that we can include them in our bandwidth history
and advertised bandwidth. Fixes bug 3803.
- Apply rate-limiting only at the bottom of a chain of filtering
bufferevents. This prevents us from filling up internal read
buffers and violating rate-limits when filtering bufferevents
are enabled. Fixes part of bug 3804.
- Add high-watermarks to the output buffers for filtered
bufferevents. This prevents us from filling up internal write
buffers and wasting CPU cycles when filtering bufferevents are
enabled. Fixes part of bug 3804.
- Correctly notice when data has been written from a bufferevent
without flushing it completely. Fixes bug 3805.
- Fix a bug where server-side tunneled bufferevent-based directory
streams would get closed prematurely. Fixes bug 3814.
- Fix a use-after-free error with per-connection rate-limiting
buckets. Fixes bug 3888.
o Major bugfixes (also part of 0.2.2.31-rc):
- If we're configured to write our ControlPorts to disk, only write
them after switching UID and creating the data directory. This way,
we don't fail when starting up with a nonexistent DataDirectory
and a ControlPortWriteToFile setting based on that directory. Fixes
bug 3747; bugfix on Tor 0.2.2.26-beta.
o Minor features:
- Added a new CONF_CHANGED event so that controllers can be notified
of any configuration changes made by other controllers, or by the
user. Implements ticket 1692.
- Use evbuffer_copyout() in inspect_evbuffer(). This fixes a memory
leak when using bufferevents, and lets Libevent worry about how to
best copy data out of a buffer.
- Replace files in stats/ rather than appending to them. Now that we
include statistics in extra-info descriptors, it makes no sense to
keep old statistics forever. Implements ticket 2930.
o Minor features (build compatibility):
- Limited, experimental support for building with nmake and MSVC.
- Provide a substitute implementation of lround() for MSVC, which
apparently lacks it. Patch from Gisle Vanem.
o Minor features (also part of 0.2.2.31-rc):
- Update to the August 2 2011 Maxmind GeoLite Country database.
o Minor bugfixes (on 0.2.3.x-alpha):
- Fix a spurious warning when parsing SOCKS requests with
bufferevents enabled. Fixes bug 3615; bugfix on 0.2.3.2-alpha.
- Get rid of a harmless warning that could happen on relays running
with bufferevents. The warning was caused by someone doing an http
request to a relay's orport. Also don't warn for a few related
non-errors. Fixes bug 3700; bugfix on 0.2.3.1-alpha.
o Minor bugfixes (on 2.2.x and earlier):
- Correct the man page to explain that HashedControlPassword and
CookieAuthentication can both be set, in which case either method
is sufficient to authenticate to Tor. Bugfix on 0.2.0.7-alpha,
when we decided to allow these config options to both be set. Issue
raised by bug 3898.
- The "--quiet" and "--hush" options now apply not only to Tor's
behavior before logs are configured, but also to Tor's behavior in
the absence of configured logs. Fixes bug 3550; bugfix on
0.2.0.10-alpha.
o Minor bugfixes (also part of 0.2.2.31-rc):
- Write several files in text mode, on OSes that distinguish text
mode from binary mode (namely, Windows). These files are:
'buffer-stats', 'dirreq-stats', and 'entry-stats' on relays
that collect those statistics; 'client_keys' and 'hostname' for
hidden services that use authentication; and (in the tor-gencert
utility) newly generated identity and signing keys. Previously,
we wouldn't specify text mode or binary mode, leading to an
assertion failure. Fixes bug 3607. Bugfix on 0.2.1.1-alpha (when
the DirRecordUsageByCountry option which would have triggered
the assertion failure was added), although this assertion failure
would have occurred in tor-gencert on Windows in 0.2.0.1-alpha.
- Selectively disable deprecation warnings on OS X because Lion
started deprecating the shipped copy of openssl. Fixes bug 3643.
- Remove an extra pair of quotation marks around the error
message in control-port STATUS_GENERAL BUG events. Bugfix on
0.1.2.6-alpha; fixes bug 3732.
- When unable to format an address as a string, report its value
as "???" rather than reusing the last formatted address. Bugfix
on 0.2.1.5-alpha.
o Code simplifications and refactoring:
- Rewrite the listener-selection logic so that parsing which ports
we want to listen on is now separate from binding to the ports
we want.
o Build changes:
- Building Tor with bufferevent support now requires Libevent
2.0.13-stable or later. Previous versions of Libevent had bugs in
SSL-related bufferevents and related issues that would make Tor
work badly with bufferevents. Requiring 2.0.13-stable also allows
Tor with bufferevents to take advantage of Libevent APIs
introduced after 2.0.8-rc.
Changes in version 0.2.2.32 - 2011-08-27
The Tor 0.2.2 release series is dedicated to the memory of Andreas
Pfitzmann (1958-2010), a pioneer in anonymity and privacy research,
a founder of the PETS community, a leader in our field, a mentor,
and a friend. He left us with these words: "I had the possibility
to contribute to this world that is not as it should be. I hope I
could help in some areas to make the world a better place, and that
I could also encourage other people to be engaged in improving the
world. Please, stay engaged. This world needs you, your love, your
initiative -- now I cannot be part of that anymore."
Tor 0.2.2.32, the first stable release in the 0.2.2 branch, is finally
ready. More than two years in the making, this release features improved
client performance and hidden service reliability, better compatibility
for Android, correct behavior for bridges that listen on more than
one address, more extensible and flexible directory object handling,
better reporting of network statistics, improved code security, and
many many other features and bugfixes.
Changes in version 0.2.2.31-rc - 2011-08-17
Tor 0.2.2.31-rc is the second and hopefully final release candidate
for the Tor 0.2.2.x series.
o Major bugfixes:
- Remove an extra pair of quotation marks around the error
message in control-port STATUS_GENERAL BUG events. Bugfix on
0.1.2.6-alpha; fixes bug 3732.
- If we're configured to write our ControlPorts to disk, only write
them after switching UID and creating the data directory. This way,
we don't fail when starting up with a nonexistent DataDirectory
and a ControlPortWriteToFile setting based on that directory. Fixes
bug 3747; bugfix on Tor 0.2.2.26-beta.
o Minor features:
- Update to the August 2 2011 Maxmind GeoLite Country database.
o Minor bugfixes:
- Allow GETINFO fingerprint to return a fingerprint even when
we have not yet built a router descriptor. Fixes bug 3577;
bugfix on 0.2.0.1-alpha.
- Write several files in text mode, on OSes that distinguish text
mode from binary mode (namely, Windows). These files are:
'buffer-stats', 'dirreq-stats', and 'entry-stats' on relays
that collect those statistics; 'client_keys' and 'hostname' for
hidden services that use authentication; and (in the tor-gencert
utility) newly generated identity and signing keys. Previously,
we wouldn't specify text mode or binary mode, leading to an
assertion failure. Fixes bug 3607. Bugfix on 0.2.1.1-alpha (when
the DirRecordUsageByCountry option which would have triggered
the assertion failure was added), although this assertion failure
would have occurred in tor-gencert on Windows in 0.2.0.1-alpha.
- Selectively disable deprecation warnings on OS X because Lion
started deprecating the shipped copy of openssl. Fixes bug 3643.
- When unable to format an address as a string, report its value
as "???" rather than reusing the last formatted address. Bugfix
on 0.2.1.5-alpha.
Changes in version 0.2.3.2-alpha - 2011-07-18
Tor 0.2.3.2-alpha introduces two new experimental features:
microdescriptors and pluggable transports. It also continues cleaning
up a variety of recently introduced features.
o Major features:
- Clients can now use microdescriptors instead of regular descriptors
to build circuits. Microdescriptors are authority-generated
summaries of regular descriptors' contents, designed to change
very rarely (see proposal 158 for details). This feature is
designed to save bandwidth, especially for clients on slow internet
connections. It's off by default for now, since nearly no caches
support it, but it will be on-by-default for clients in a future
version. You can use the UseMicrodescriptors option to turn it on.
- Tor clients using bridges can now be configured to use a separate
'transport' proxy for each bridge. This approach helps to resist
censorship by allowing bridges to use protocol obfuscation
plugins. It implements part of proposal 180. Implements ticket 2841.
- While we're trying to bootstrap, record how many TLS connections
fail in each state, and report which states saw the most failures
in response to any bootstrap failures. This feature may speed up
diagnosis of censorship events. Implements ticket 3116.
o Major bugfixes (on 0.2.3.1-alpha):
- When configuring a large set of nodes in EntryNodes (as with
'EntryNodes {cc}' or 'EntryNodes 1.1.1.1/16'), choose only a
random subset to be guards, and choose them in random
order. Fixes bug 2798.
- Tor could crash when remembering a consensus in a non-used consensus
flavor without having a current consensus set. Fixes bug 3361.
- Comparing an unknown address to a microdescriptor's shortened exit
policy would always give a "rejected" result. Fixes bug 3599.
- Using microdescriptors as a client no longer prevents Tor from
uploading and downloading hidden service descriptors. Fixes
bug 3601.
o Minor features:
- Allow nameservers with IPv6 address. Resolves bug 2574.
- Accept attempts to include a password authenticator in the
handshake, as supported by SOCKS5. This handles SOCKS clients that
don't know how to omit a password when authenticating. Resolves
bug 1666.
- When configuring a large set of nodes in EntryNodes, and there are
enough of them listed as Guard so that we don't need to consider
the non-guard entries, prefer the ones listed with the Guard flag.
- Check for and recover from inconsistency in the microdescriptor
cache. This will make it harder for us to accidentally free a
microdescriptor without removing it from the appropriate data
structures. Fixes issue 3135; issue noted by "wanoskarnet".
- Log SSL state transitions at log level DEBUG, log domain
HANDSHAKE. This can be useful for debugging censorship events.
Implements ticket 3264.
- Add port 6523 (Gobby) to LongLivedPorts. Patch by intrigeri;
implements ticket 3439.
o Minor bugfixes (on 0.2.3.1-alpha):
- Do not free all general-purpose regular descriptors just
because microdescriptor use is enabled. Fixes bug 3113.
- Correctly link libevent_openssl when --enable-static-libevent
is passed to configure. Fixes bug 3118.
- Bridges should not complain during their heartbeat log messages that
they are unlisted in the consensus: that's more or less the point
of being a bridge. Fixes bug 3183.
- Report a SIGNAL event to controllers when acting on a delayed
SIGNAL NEWNYM command. Previously, we would report a SIGNAL
event to the controller if we acted on a SIGNAL NEWNYM command
immediately, and otherwise not report a SIGNAL event for the
command at all. Fixes bug 3349.
- Fix a crash when handling the SIGNAL controller command or
reporting ERR-level status events with bufferevents enabled. Found
by Robert Ransom. Fixes bug 3367.
- Always ship the tor-fw-helper manpage in our release tarballs.
Fixes bug 3389. Reported by Stephen Walker.
- Fix a class of double-mark-for-close bugs when bufferevents
are enabled. Fixes bug 3403.
- Update tor-fw-helper to support libnatpmp-20110618. Fixes bug 3434.
- Add SIGNAL to the list returned by the 'GETINFO events/names'
control-port command. Fixes part of bug 3465.
- Prevent using negative indices during unit test runs when read_all()
fails. Spotted by coverity.
- Fix a rare memory leak when checking the nodelist without it being
present. Found by coverity.
- Only try to download a microdescriptor-flavored consensus from
a directory cache that provides them.
o Minor bugfixes (on 0.2.2.x and earlier):
- Assert that hidden-service-related operations are not performed
using single-hop circuits. Previously, Tor would assert that
client-side streams are not attached to single-hop circuits,
but not that other sensitive operations on the client and service
side are not performed using single-hop circuits. Fixes bug 3332;
bugfix on 0.0.6.
- Don't publish a new relay descriptor when we reload our onion key,
unless the onion key has actually changed. Fixes bug 3263 and
resolves another cause of bug 1810. Bugfix on 0.1.1.11-alpha.
- Allow GETINFO fingerprint to return a fingerprint even when
we have not yet built a router descriptor. Fixes bug 3577;
bugfix on 0.2.0.1-alpha.
- Make 'tor --digests' list hashes of all Tor source files. Bugfix
on 0.2.2.4-alpha; fixes bug 3427.
o Code simplification and refactoring:
- Use tor_sscanf() in place of scanf() in more places through the
code. This makes us a little more locale-independent, and
should help shut up code-analysis tools that can't tell
a safe sscanf string from a dangerous one.
- Use tt_assert(), not tor_assert(), for checking for test failures.
This makes the unit tests more able to go on in the event that
one of them fails.
- Split connection_about_to_close() into separate functions for each
connection type.
o Build changes:
- On Windows, we now define the _WIN32_WINNT macros only if they
are not already defined. This lets the person building Tor decide,
if they want, to require a later version of Windows.
Changes in version 0.2.2.30-rc - 2011-07-07
Tor 0.2.2.30-rc is the first release candidate for the Tor 0.2.2.x
series. It fixes a few smaller bugs, but generally appears stable.
Please test it and let us know whether it is!
o Minor bugfixes:
- Send a SUCCEEDED stream event to the controller when a reverse
resolve succeeded. Fixes bug 3536; bugfix on 0.0.8pre1. Issue
discovered by katmagic.
- Always NUL-terminate the sun_path field of a sockaddr_un before
passing it to the kernel. (Not a security issue: kernels are
smart enough to reject bad sockaddr_uns.) Found by Coverity;
CID #428. Bugfix on Tor 0.2.0.3-alpha.
- Don't stack-allocate the list of supplementary GIDs when we're
about to log them. Stack-allocating NGROUPS_MAX gid_t elements
could take up to 256K, which is way too much stack. Found by
Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
- Add BUILDTIMEOUT_SET to the list returned by the 'GETINFO
events/names' control-port command. Bugfix on 0.2.2.9-alpha;
fixes part of bug 3465.
- Fix a memory leak when receiving a descriptor for a hidden
service we didn't ask for. Found by Coverity; CID #30. Bugfix
on 0.2.2.26-beta.
o Minor features:
- Update to the July 1 2011 Maxmind GeoLite Country database.
Changes in version 0.2.2.29-beta - 2011-06-20
Tor 0.2.2.29-beta reverts an accidental behavior change for users who
have bridge lines in their torrc but don't want to use them; gets
us closer to having the control socket feature working on Debian;
and fixes a variety of smaller bugs.
o Major bugfixes:
- Revert the UseBridges option to its behavior before 0.2.2.28-beta.
When we changed the default behavior to "use bridges if any
are listed in the torrc", we surprised users who had bridges
in their torrc files but who didn't actually want to use them.
Partial resolution for bug 3354.
o Privacy fixes:
- Don't attach new streams to old rendezvous circuits after SIGNAL
NEWNYM. Previously, we would keep using an existing rendezvous
circuit if it remained open (i.e. if it were kept open by a
long-lived stream, or if a new stream were attached to it before
Tor could notice that it was old and no longer in use). Bugfix on
0.1.1.15-rc; fixes bug 3375.
o Minor bugfixes:
- Fix a bug when using ControlSocketsGroupWritable with User. The
directory's group would be checked against the current group, not
the configured group. Patch by Jérémy Bobbio. Fixes bug 3393;
bugfix on 0.2.2.26-beta.
- Make connection_printf_to_buf()'s behavior sane. Its callers
expect it to emit a CRLF iff the format string ends with CRLF;
it actually emitted a CRLF iff (a) the format string ended with
CRLF or (b) the resulting string was over 1023 characters long or
(c) the format string did not end with CRLF *and* the resulting
string was 1021 characters long or longer. Bugfix on 0.1.1.9-alpha;
fixes part of bug 3407.
- Make send_control_event_impl()'s behavior sane. Its callers
expect it to always emit a CRLF at the end of the string; it
might have emitted extra control characters as well. Bugfix on
0.1.1.9-alpha; fixes another part of bug 3407.
- Make crypto_rand_int() check the value of its input correctly.
Previously, it accepted values up to UINT_MAX, but could return a
negative number if given a value above INT_MAX+1. Found by George
Kadianakis. Fixes bug 3306; bugfix on 0.2.2pre14.
- Avoid a segfault when reading a malformed circuit build state
with more than INT_MAX entries. Found by wanoskarnet. Bugfix on
0.2.2.4-alpha.
- When asked about a DNS record type we don't support via a
client DNSPort, reply with NOTIMPL rather than an empty
reply. Patch by intrigeri. Fixes bug 3369; bugfix on 2.0.1-alpha.
- Fix a rare memory leak during stats writing. Found by coverity.
o Minor features:
- Update to the June 1 2011 Maxmind GeoLite Country database.
o Code simplifications and refactoring:
- Remove some dead code as indicated by coverity.
- Remove a few dead assignments during router parsing. Found by
coverity.
- Add some forgotten return value checks during unit tests. Found
by coverity.
- Don't use 1-bit wide signed bit fields. Found by coverity.
Changes in version 0.2.2.28-beta - 2011-06-04
Tor 0.2.2.28-beta makes great progress towards a new stable release: we
fixed a big bug in whether relays stay in the consensus consistently,
we moved closer to handling bridges and hidden services correctly,
and we started the process of better handling the dreaded "my Vidalia
died, and now my Tor demands a password when I try to reconnect to it"
usability issue.
o Major bugfixes:
- Don't decide to make a new descriptor when receiving a HUP signal.
This bug has caused a lot of 0.2.2.x relays to disappear from the
consensus periodically. Fixes the most common case of triggering
bug 1810; bugfix on 0.2.2.7-alpha.
- Actually allow nameservers with IPv6 addresses. Fixes bug 2574.
- Don't try to build descriptors if "ORPort auto" is set and we
don't know our actual ORPort yet. Fix for bug 3216; bugfix on
0.2.2.26-beta.
- Resolve a crash that occurred when setting BridgeRelay to 1 with
accounting enabled. Fixes bug 3228; bugfix on 0.2.2.18-alpha.
- Apply circuit timeouts to opened hidden-service-related circuits
based on the correct start time. Previously, we would apply the
circuit build timeout based on time since the circuit's creation;
it was supposed to be applied based on time since the circuit
entered its current state. Bugfix on 0.0.6; fixes part of bug 1297.
- Use the same circuit timeout for client-side introduction
circuits as for other four-hop circuits, rather than the timeout
for single-hop directory-fetch circuits; the shorter timeout may
have been appropriate with the static circuit build timeout in
0.2.1.x and earlier, but caused many hidden service access attempts
to fail with the adaptive CBT introduced in 0.2.2.2-alpha. Bugfix
on 0.2.2.2-alpha; fixes another part of bug 1297.
- In ticket 2511 we fixed a case where you could use an unconfigured
bridge if you had configured it as a bridge the last time you ran
Tor. Now fix another edge case: if you had configured it as a bridge
but then switched to a different bridge via the controller, you
would still be willing to use the old one. Bugfix on 0.2.0.1-alpha;
fixes bug 3321.
o Major features:
- Add an __OwningControllerProcess configuration option and a
TAKEOWNERSHIP control-port command. Now a Tor controller can ensure
that when it exits, Tor will shut down. Implements feature 3049.
- If "UseBridges 1" is set and no bridges are configured, Tor will
now refuse to build any circuits until some bridges are set.
If "UseBridges auto" is set, Tor will use bridges if they are
configured and we are not running as a server, but otherwise will
make circuits as usual. The new default is "auto". Patch by anonym,
so the Tails LiveCD can stop automatically revealing you as a Tor
user on startup.
o Minor bugfixes:
- Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
- Remove a trailing asterisk from "exit-policy/default" in the
output of the control port command "GETINFO info/names". Bugfix
on 0.1.2.5-alpha.
- Use a wide type to hold sockets when built for 64-bit Windows builds.
Fixes bug 3270.
- Warn when the user configures two HiddenServiceDir lines that point
to the same directory. Bugfix on 0.0.6 (the version introducing
HiddenServiceDir); fixes bug 3289.
- Remove dead code from rend_cache_lookup_v2_desc_as_dir. Fixes
part of bug 2748; bugfix on 0.2.0.10-alpha.
- Log malformed requests for rendezvous descriptors as protocol
warnings, not warnings. Also, use a more informative log message
in case someone sees it at log level warning without prior
info-level messages. Fixes the other part of bug 2748; bugfix
on 0.2.0.10-alpha.
- Clear the table recording the time of the last request for each
hidden service descriptor from each HS directory on SIGNAL NEWNYM.
Previously, we would clear our HS descriptor cache on SIGNAL
NEWNYM, but if we had previously retrieved a descriptor (or tried
to) from every directory responsible for it, we would refuse to
fetch it again for up to 15 minutes. Bugfix on 0.2.2.25-alpha;
fixes bug 3309.
- Fix a log message that said "bits" while displaying a value in
bytes. Found by wanoskarnet. Fixes bug 3318; bugfix on
0.2.0.1-alpha.
- When checking for 1024-bit keys, check for 1024 bits, not 128
bytes. This allows Tor to correctly discard keys of length 1017
through 1023. Bugfix on 0.0.9pre5.
o Minor features:
- Relays now log the reason for publishing a new relay descriptor,
so we have a better chance of hunting down instances of bug 1810.
Resolves ticket 3252.
- Revise most log messages that refer to nodes by nickname to
instead use the "$key=nickname at address" format. This should be
more useful, especially since nicknames are less and less likely
to be unique. Resolves ticket 3045.
- Log (at info level) when purging pieces of hidden-service-client
state because of SIGNAL NEWNYM.
o Removed options:
- Remove undocumented option "-F" from tor-resolve: it hasn't done
anything since 0.2.1.16-rc.
Changes in version 0.2.2.27-beta - 2011-05-18
Tor 0.2.2.27-beta fixes a bridge-related stability bug in the previous
release, and also adds a few more general bugfixes.
o Major bugfixes:
- Fix a crash bug when changing bridges in a running Tor process.
Fixes bug 3213; bugfix on 0.2.2.26-beta.
- When the controller configures a new bridge, don't wait 10 to 60
seconds before trying to fetch its descriptor. Bugfix on
0.2.0.3-alpha; fixes bug 3198 (suggested by 2355).
o Minor bugfixes:
- Require that onion keys have exponent 65537 in microdescriptors too.
Fixes more of bug 3207; bugfix on 0.2.2.26-beta.
- Tor used to limit HttpProxyAuthenticator values to 48 characters.
Changed the limit to 512 characters by removing base64 newlines.
Fixes bug 2752. Fix by Michael Yakubovich.
- When a client starts or stops using bridges, never use a circuit
that was built before the configuration change. This behavior could
put at risk a user who uses bridges to ensure that her traffic
only goes to the chosen addresses. Bugfix on 0.2.0.3-alpha; fixes
bug 3200.
Changes in version 0.2.2.26-beta - 2011-05-17
Tor 0.2.2.26-beta fixes a variety of potential privacy problems. It
also introduces a new "socksport auto" approach that should make it
easier to run multiple Tors on the same system, and does a lot of
cleanup to get us closer to a release candidate.
o Security/privacy fixes:
- Replace all potentially sensitive memory comparison operations
with versions whose runtime does not depend on the data being
compared. This will help resist a class of attacks where an
adversary can use variations in timing information to learn
sensitive data. Fix for one case of bug 3122. (Safe memcmp
implementation by Robert Ransom based partially on code by DJB.)
- When receiving a hidden service descriptor, check that it is for
the hidden service we wanted. Previously, Tor would store any
hidden service descriptors that a directory gave it, whether it
wanted them or not. This wouldn't have let an attacker impersonate
a hidden service, but it did let directories pre-seed a client
with descriptors that it didn't want. Bugfix on 0.0.6.
- On SIGHUP, do not clear out all TrackHostExits mappings, client
DNS cache entries, and virtual address mappings: that's what
NEWNYM is for. Fixes bug 1345; bugfix on 0.1.0.1-rc.
o Major features:
- The options SocksPort, ControlPort, and so on now all accept a
value "auto" that opens a socket on an OS-selected port. A
new ControlPortWriteToFile option tells Tor to write its
actual control port or ports to a chosen file. If the option
ControlPortFileGroupReadable is set, the file is created as
group-readable. Now users can run two Tor clients on the same
system without needing to manually mess with parameters. Resolves
part of ticket 3076.
- Set SO_REUSEADDR on all sockets, not just listeners. This should
help busy exit nodes avoid running out of useable ports just
because all the ports have been used in the near past. Resolves
issue 2850.
o Minor features:
- New "GETINFO net/listeners/(type)" controller command to return
a list of addresses and ports that are bound for listeners for a
given connection type. This is useful when the user has configured
"SocksPort auto" and the controller needs to know which port got
chosen. Resolves another part of ticket 3076.
- Add a new ControlSocketsGroupWritable configuration option: when
it is turned on, ControlSockets are group-writeable by the default
group of the current user. Patch by Jérémy Bobbio; implements
ticket 2972.
- Tor now refuses to create a ControlSocket in a directory that is
world-readable (or group-readable if ControlSocketsGroupWritable
is 0). This is necessary because some operating systems do not
enforce permissions on an AF_UNIX sockets. Permissions on the
directory holding the socket, however, seems to work everywhere.
- Rate-limit a warning about failures to download v2 networkstatus
documents. Resolves part of bug 1352.
- Backport code from 0.2.3.x that allows directory authorities to
clean their microdescriptor caches. Needed to resolve bug 2230.
- When an HTTPS proxy reports "403 Forbidden", we now explain
what it means rather than calling it an unexpected status code.
Closes bug 2503. Patch from Michael Yakubovich.
- Update to the May 1 2011 Maxmind GeoLite Country database.
o Minor bugfixes:
- Authorities now clean their microdesc cache periodically and when
reading from disk initially, not only when adding new descriptors.
This prevents a bug where we could lose microdescriptors. Bugfix
on 0.2.2.6-alpha. Fixes bug 2230.
- Do not crash when our configuration file becomes unreadable, for
example due to a permissions change, between when we start up
and when a controller calls SAVECONF. Fixes bug 3135; bugfix
on 0.0.9pre6.
- Avoid a bug that would keep us from replacing a microdescriptor
cache on Windows. (We would try to replace the file while still
holding it open. That's fine on Unix, but Windows doesn't let us
do that.) Bugfix on 0.2.2.6-alpha; bug found by wanoskarnet.
- Add missing explanations for the authority-related torrc options
RephistTrackTime, BridgePassword, and V3AuthUseLegacyKey in the
man page. Resolves issue 2379.
- As an authority, do not upload our own vote or signature set to
ourself. It would tell us nothing new, and as of 0.2.2.24-alpha,
it would get flagged as a duplicate. Resolves bug 3026.
- Accept hidden service descriptors if we think we might be a hidden
service directory, regardless of what our consensus says. This
helps robustness, since clients and hidden services can sometimes
have a more up-to-date view of the network consensus than we do,
and if they think that the directory authorities list us a HSDir,
we might actually be one. Related to bug 2732; bugfix on
0.2.0.10-alpha.
- When a controller changes TrackHostExits, remove mappings for
hosts that should no longer have their exits tracked. Bugfix on
0.1.0.1-rc.
- When a controller changes VirtualAddrNetwork, remove any mappings
for hosts that were automapped to the old network. Bugfix on
0.1.1.19-rc.
- When a controller changes one of the AutomapHosts* options, remove
any mappings for hosts that should no longer be automapped. Bugfix
on 0.2.0.1-alpha.
- Do not reset the bridge descriptor download status every time we
re-parse our configuration or get a configuration change. Fixes
bug 3019; bugfix on 0.2.0.3-alpha.
o Minor bugfixes (code cleanup):
- When loading the microdesc journal, remember its current size.
In 0.2.2, this helps prevent the microdesc journal from growing
without limit on authorities (who are the only ones to use it in
0.2.2). Fixes a part of bug 2230; bugfix on 0.2.2.6-alpha.
Fix posted by "cypherpunks."
- The microdesc journal is supposed to get rebuilt only if it is
at least _half_ the length of the store, not _twice_ the length
of the store. Bugfix on 0.2.2.6-alpha; fixes part of bug 2230.
- Fix a potential null-pointer dereference while computing a
consensus. Bugfix on 0.2.0.3-alpha, found with the help of
clang's analyzer.
- Avoid a possible null-pointer dereference when rebuilding the mdesc
cache without actually having any descriptors to cache. Bugfix on
0.2.2.6-alpha. Issue discovered using clang's static analyzer.
- If we fail to compute the identity digest of a v3 legacy keypair,
warn, and don't use a buffer-full of junk instead. Bugfix on
0.2.1.1-alpha; fixes bug 3106.
- Resolve an untriggerable issue in smartlist_string_num_isin(),
where if the function had ever in the future been used to check
for the presence of a too-large number, it would have given an
incorrect result. (Fortunately, we only used it for 16-bit
values.) Fixes bug 3175; bugfix on 0.1.0.1-rc.
- Require that introduction point keys and onion handshake keys
have a public exponent of 65537. Starts to fix bug 3207; bugfix
on 0.2.0.10-alpha.
o Removed features:
- Caches no longer download and serve v2 networkstatus documents
unless FetchV2Networkstatus flag is set: these documents haven't
haven't been used by clients or relays since 0.2.0.x. Resolves
bug 3022.
Changes in version 0.2.3.1-alpha - 2011-05-05
Tor 0.2.3.1-alpha adds some new experimental features, including support
for an improved network IO backend, IOCP networking on Windows,
microdescriptor caching, "fast-start" support for streams, and automatic
home router configuration. There are also numerous internal improvements
to try to make the code easier for developers to work with.
This is the first alpha release in a new series, so expect there to be
bugs. Users who would rather test out a more stable branch should
stay with 0.2.2.x for now.
o Major features:
- Tor can now optionally build with the "bufferevents" buffered IO
backend provided by Libevent 2. To use this feature, make sure you
have the latest possible version of Libevent, and pass the
--enable-bufferevents flag to configure when building Tor from
source. This feature will make our networking code more flexible,
let us stack layers on each other, and let us use more efficient
zero-copy transports where available.
- As an experimental feature, Tor can use IOCP for networking on Windows.
Once this code is tuned and optimized, it promises much better
performance than the select-based backend we've used in the past. To
try this feature, you must build Tor with Libevent 2, configure Tor
with the "bufferevents" buffered IO backend, and add "DisableIOCP 0" to
your torrc. There are known bugs here: only try this if you can help
debug it as it breaks.
- The EntryNodes option can now include country codes like {de} or IP
addresses or network masks. Previously we had disallowed these options
because we didn't have an efficient way to keep the list up to
date. Fixes bug 1982, but see bug 2798 for an unresolved issue here.
- Exit nodes now accept and queue data on not-yet-connected streams.
Previously, the client wasn't allowed to send data until the stream was
connected, which slowed down all connections. This change will enable
clients to perform a "fast-start" on streams and send data without
having to wait for a confirmation that the stream has opened. (Patch
from Ian Goldberg; implements the server side of Proposal 174.)
- Tor now has initial support for automatic port mapping on the many
home routers that support NAT-PMP or UPnP. (Not yet supported on
Windows). To build the support code, you'll need to have libnatpnp
library and/or the libminiupnpc library, and you'll need to enable the
feature specifically by passing "--enable-upnp" and/or
"--enable-natpnp" to configure. To turn it on, use the new
PortForwarding option.
- Caches now download, cache, and serve multiple "flavors" of the
consensus, including a flavor that describes microdescriptors.
- Caches now download, cache, and serve microdescriptors -- small
summaries of router descriptors that are authenticated by all of the
directory authorities. Once enough caches are running this code,
clients will be able to save significant amounts of directory bandwidth
by downloading microdescriptors instead of router descriptors.
o Minor features:
- Make logging resolution configurable with a new LogTimeGranularity
option, and change the default from 1 millisecond to 1 second.
Implements enhancement 1668.
- We log which torrc file we're using on startup. Implements ticket
2444.
- Ordinarily, Tor does not count traffic from private addresses (like
127.0.0.1 or 10.0.0.1) when calculating rate limits or accounting.
There is now a new option, CountPrivateBandwidth, to disable this
behavior. Patch from Daniel Cagara.
- New --enable-static-tor configure option for building Tor as
statically as possible. Idea, general hackery and thoughts from
Alexei Czeskis, John Gilmore, Jacob Appelbaum. Implements ticket
2702.
- If you set the NumCPUs option to 0, Tor will now try to detect how
many CPUs you have. This is the new default behavior.
- Turn on directory request statistics by default and include them in
extra-info descriptors. Don't break if we have no GeoIP database.
- Relays that set "ConnDirectionStatistics 1" write statistics on the
bidirectional use of connections to disk every 24 hours.
- Add a GeoIP file digest to the extra-info descriptor. Implements
enhancement 1883.
- The NodeFamily option -- which let you declare that you want to
consider nodes to be part of a family whether they list themselves
that way or not -- now allows IP address ranges and country codes.
- Add a new 'Heartbeat' log message type to periodically log a message
describing Tor's status at level Notice. This feature is meant for
operators who log at notice, and want to make sure that their Tor
server is still working. Implementation by George Kadianakis.
o Minor bugfixes (on 0.2.2.25-alpha):
- When loading the microdesc journal, remember its current size.
In 0.2.2, this helps prevent the microdesc journal from growing
without limit on authorities (who are the only ones to use it in
0.2.2). Fixes a part of bug 2230; bugfix on 0.2.2.6-alpha.
Fix posted by "cypherpunks."
- The microdesc journal is supposed to get rebuilt only if it is
at least _half_ the length of the store, not _twice_ the length
of the store. Bugfix on 0.2.2.6-alpha; fixes part of bug 2230.
- If as an authority we fail to compute the identity digest of a v3
legacy keypair, warn, and don't use a buffer-full of junk instead.
Bugfix on 0.2.1.1-alpha; fixes bug 3106.
- Authorities now clean their microdesc cache periodically and when
reading from disk initially, not only when adding new descriptors.
This prevents a bug where we could lose microdescriptors. Bugfix
on 0.2.2.6-alpha.
o Minor features (controller):
- Add a new SIGNAL event to the controller interface so that
controllers can be notified when Tor handles a signal. Resolves
issue 1955. Patch by John Brooks.
- Add a new GETINFO option to get total bytes read and written. Patch
from pipe, revised by atagar. Resolves ticket 2345.
- Implement some GETINFO controller fields to provide information about
the Tor process's pid, euid, username, and resource limits.
o Build changes:
- Our build system requires automake 1.6 or later to create the
Makefile.in files. Previously, you could have used 1.4.
This only affects developers and people building Tor from git;
people who build Tor from the source distribution without changing
the Makefile.am files should be fine.
- Our autogen.sh script uses autoreconf to launch autoconf, automake, and
so on. This is more robust against some of the failure modes
associated with running the autotools pieces on their own.
o Minor packaging issues:
- On OpenSUSE, create the /var/run/tor directory on startup if it is not
already created. Patch from Andreas Stieger. Fixes bug 2573.
o Code simplifications and refactoring:
- A major revision to our internal node-selecting and listing logic.
Tor already had at least two major ways to look at the question of
"which Tor servers do we know about": a list of router descriptors,
and a list of entries in the current consensus. With
microdescriptors, we're adding a third. Having so many systems
without an abstraction layer over them was hurting the codebase.
Now, we have a new "node_t" abstraction that presents a consistent
interface to a client's view of a Tor node, and holds (nearly) all
of the mutable state formerly in routerinfo_t and routerstatus_t.
- The helper programs tor-gencert, tor-resolve, and tor-checkkey
no longer link against Libevent: they never used it, but
our library structure used to force them to link it.
o Removed features:
- Remove some old code to work around even older versions of Tor that
used forked processes to handle DNS requests. Such versions of Tor
are no longer in use as servers.
o Documentation fixes:
- Correct a broken faq link in the INSTALL file. Fixes bug 2307.
- Add missing documentation for the authority-related torrc options
RephistTrackTime, BridgePassword, and V3AuthUseLegacyKey. Resolves
issue 2379.
Changes in version 0.2.2.25-alpha - 2011-04-29
Tor 0.2.2.25-alpha fixes many bugs: hidden service clients are more
robust, routers no longer overreport their bandwidth, Win7 should crash
a little less, and NEWNYM (as used by Vidalia's "new identity" button)
now prevents hidden service-related activity from being linkable. It
provides more information to Vidalia so you can see if your bridge is
working. Also, 0.2.2.25-alpha revamps the Entry/Exit/ExcludeNodes and
StrictNodes configuration options to make them more reliable, more
understandable, and more regularly applied. If you use those options,
please see the revised documentation for them in the manual page.
o Major bugfixes:
- Relays were publishing grossly inflated bandwidth values because
they were writing their state files wrong--now they write the
correct value. Also, resume reading bandwidth history from the
state file correctly. Fixes bug 2704; bugfix on 0.2.2.23-alpha.
- Improve hidden service robustness: When we find that we have
extended a hidden service's introduction circuit to a relay not
listed as an introduction point in the HS descriptor we currently
have, retry with an introduction point from the current
descriptor. Previously we would just give up. Fixes bugs 1024 and
1930; bugfix on 0.2.0.10-alpha.
- Clients now stop trying to use an exit node associated with a given
destination by TrackHostExits if they fail to reach that exit node.
Fixes bug 2999. Bugfix on 0.2.0.20-rc.
- Fix crash bug on platforms where gmtime and localtime can return
NULL. Windows 7 users were running into this one. Fixes part of bug
2077. Bugfix on all versions of Tor. Found by boboper.
o Security and stability fixes:
- Don't double-free a parsable, but invalid, microdescriptor, even if
it is followed in the blob we're parsing by an unparsable
microdescriptor. Fixes an issue reported in a comment on bug 2954.
Bugfix on 0.2.2.6-alpha; fix by "cypherpunks".
- If the Nickname configuration option isn't given, Tor would pick a
nickname based on the local hostname as the nickname for a relay.
Because nicknames are not very important in today's Tor and the
"Unnamed" nickname has been implemented, this is now problematic
behavior: It leaks information about the hostname without being
useful at all. Fixes bug 2979; bugfix on 0.1.2.2-alpha, which
introduced the Unnamed nickname. Reported by tagnaq.
- Fix an uncommon assertion failure when running with DNSPort under
heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
- Avoid linkability based on cached hidden service descriptors: forget
all hidden service descriptors cached as a client when processing a
SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
o Major features:
- Export GeoIP information on bridge usage to controllers even if we
have not yet been running for 24 hours. Now Vidalia bridge operators
can get more accurate and immediate feedback about their
contributions to the network.
o Major features and bugfixes (node selection):
- Revise and reconcile the meaning of the ExitNodes, EntryNodes,
ExcludeEntryNodes, ExcludeExitNodes, ExcludeNodes, and StrictNodes
options. Previously, we had been ambiguous in describing what
counted as an "exit" node, and what operations exactly "StrictNodes
0" would permit. This created confusion when people saw nodes built
through unexpected circuits, and made it hard to tell real bugs from
surprises. Now the intended behavior is:
. "Exit", in the context of ExitNodes and ExcludeExitNodes, means
a node that delivers user traffic outside the Tor network.
. "Entry", in the context of EntryNodes, means a node used as the
first hop of a multihop circuit. It doesn't include direct
connections to directory servers.
. "ExcludeNodes" applies to all nodes.
. "StrictNodes" changes the behavior of ExcludeNodes only. When
StrictNodes is set, Tor should avoid all nodes listed in
ExcludeNodes, even when it will make user requests fail. When
StrictNodes is *not* set, then Tor should follow ExcludeNodes
whenever it can, except when it must use an excluded node to
perform self-tests, connect to a hidden service, provide a
hidden service, fulfill a .exit request, upload directory
information, or fetch directory information.
Collectively, the changes to implement the behavior fix bug 1090.
- ExcludeNodes now takes precedence over EntryNodes and ExitNodes: if
a node is listed in both, it's treated as excluded.
- ExcludeNodes now applies to directory nodes -- as a preference if
StrictNodes is 0, or an absolute requirement if StrictNodes is 1.
Don't exclude all the directory authorities and set StrictNodes to 1
unless you really want your Tor to break.
- ExcludeNodes and ExcludeExitNodes now override exit enclaving.
- ExcludeExitNodes now overrides .exit requests.
- We don't use bridges listed in ExcludeNodes.
- When StrictNodes is 1:
. We now apply ExcludeNodes to hidden service introduction points
and to rendezvous points selected by hidden service users. This
can make your hidden service less reliable: use it with caution!
. If we have used ExcludeNodes on ourself, do not try relay
reachability self-tests.
. If we have excluded all the directory authorities, we will not
even try to upload our descriptor if we're a relay.
. Do not honor .exit requests to an excluded node.
- Remove a misfeature that caused us to ignore the Fast/Stable flags
when ExitNodes is set. Bugfix on 0.2.2.7-alpha.
- When the set of permitted nodes changes, we now remove any mappings
introduced via TrackExitHosts to now-excluded nodes. Bugfix on
0.1.0.1-rc.
- We never cannibalize a circuit that had excluded nodes on it, even
if StrictNodes is 0. Bugfix on 0.1.0.1-rc.
- Revert a change where we would be laxer about attaching streams to
circuits than when building the circuits. This was meant to prevent
a set of bugs where streams were never attachable, but our improved
code here should make this unnecessary. Bugfix on 0.2.2.7-alpha.
- Keep track of how many times we launch a new circuit to handle a
given stream. Too many launches could indicate an inconsistency
between our "launch a circuit to handle this stream" logic and our
"attach this stream to one of the available circuits" logic.
- Improve log messages related to excluded nodes.
o Minor bugfixes:
- Fix a spurious warning when moving from a short month to a long
month on relays with month-based BandwidthAccounting. Bugfix on
0.2.2.17-alpha; fixes bug 3020.
- When a client finds that an origin circuit has run out of 16-bit
stream IDs, we now mark it as unusable for new streams. Previously,
we would try to close the entire circuit. Bugfix on 0.0.6.
- Add a forgotten cast that caused a compile warning on OS X 10.6.
Bugfix on 0.2.2.24-alpha.
- Be more careful about reporting the correct error from a failed
connect() system call. Under some circumstances, it was possible to
look at an incorrect value for errno when sending the end reason.
Bugfix on 0.1.0.1-rc.
- Correctly handle an "impossible" overflow cases in connection byte
counting, where we write or read more than 4GB on an edge connection
in a single second. Bugfix on 0.1.2.8-beta.
- Correct the warning displayed when a rendezvous descriptor exceeds
the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
John Brooks.
- Clients and hidden services now use HSDir-flagged relays for hidden
service descriptor downloads and uploads even if the relays have no
DirPort set and the client has disabled TunnelDirConns. This will
eventually allow us to give the HSDir flag to relays with no
DirPort. Fixes bug 2722; bugfix on 0.2.1.6-alpha.
- Downgrade "no current certificates known for authority" message from
Notice to Info. Fixes bug 2899; bugfix on 0.2.0.10-alpha.
- Make the SIGNAL DUMP control-port command work on FreeBSD. Fixes bug
2917. Bugfix on 0.1.1.1-alpha.
- Only limit the lengths of single HS descriptors, even when multiple
HS descriptors are published to an HSDir relay in a single POST
operation. Fixes bug 2948; bugfix on 0.2.1.5-alpha. Found by hsdir.
- Write the current time into the LastWritten line in our state file,
rather than the time from the previous write attempt. Also, stop
trying to use a time of -1 in our log statements. Fixes bug 3039;
bugfix on 0.2.2.14-alpha.
- Be more consistent in our treatment of file system paths. "~" should
get expanded to the user's home directory in the Log config option.
Fixes bug 2971; bugfix on 0.2.0.1-alpha, which introduced the
feature for the -f and --DataDirectory options.
o Minor features:
- Make sure every relay writes a state file at least every 12 hours.
Previously, a relay could go for weeks without writing its state
file, and on a crash could lose its bandwidth history, capacity
estimates, client country statistics, and so on. Addresses bug 3012.
- Send END_STREAM_REASON_NOROUTE in response to EHOSTUNREACH errors.
Clients before 0.2.1.27 didn't handle NOROUTE correctly, but such
clients are already deprecated because of security bugs.
- Don't allow v0 hidden service authorities to act as clients.
Required by fix for bug 3000.
- Ignore SIGNAL NEWNYM commands on relay-only Tor instances. Required
by fix for bug 3000.
- Ensure that no empty [dirreq-](read|write)-history lines are added
to an extrainfo document. Implements ticket 2497.
o Code simplification and refactoring:
- Remove workaround code to handle directory responses from servers
that had bug 539 (they would send HTTP status 503 responses _and_
send a body too). Since only server versions before
0.2.0.16-alpha/0.1.2.19 were affected, there is no longer reason to
keep the workaround in place.
- Remove the old 'fuzzy time' logic. It was supposed to be used for
handling calculations where we have a known amount of clock skew and
an allowed amount of unknown skew. But we only used it in three
places, and we never adjusted the known/unknown skew values. This is
still something we might want to do someday, but if we do, we'll
want to do it differently.
- Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
None of the cases where we did this before were wrong, but by making
this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
- Use GetTempDir to find the proper temporary directory location on
Windows when generating temporary files for the unit tests. Patch by
Gisle Vanem.
Changes in version 0.2.2.24-alpha - 2011-04-08
Tor 0.2.2.24-alpha fixes a variety of bugs, including a big bug that
prevented Tor clients from effectively using "multihomed" bridges,
that is, bridges that listen on multiple ports or IP addresses so users
can continue to use some of their addresses even if others get blocked.
o Major bugfixes:
- Fix a bug where bridge users who configure the non-canonical
address of a bridge automatically switch to its canonical
address. If a bridge listens at more than one address, it should be
able to advertise those addresses independently and any non-blocked
addresses should continue to work. Bugfix on Tor 0.2.0.x. Fixes
bug 2510.
- If you configured Tor to use bridge A, and then quit and
configured Tor to use bridge B instead, it would happily continue
to use bridge A if it's still reachable. While this behavior is
a feature if your goal is connectivity, in some scenarios it's a
dangerous bug. Bugfix on Tor 0.2.0.1-alpha; fixes bug 2511.
- Directory authorities now use data collected from their own
uptime observations when choosing whether to assign the HSDir flag
to relays, instead of trusting the uptime value the relay reports in
its descriptor. This change helps prevent an attack where a small
set of nodes with frequently-changing identity keys can blackhole
a hidden service. (Only authorities need upgrade; others will be
fine once they do.) Bugfix on 0.2.0.10-alpha; fixes bug 2709.
o Minor bugfixes:
- When we restart our relay, we might get a successful connection
from the outside before we've started our reachability tests,
triggering a warning: "ORPort found reachable, but I have no
routerinfo yet. Failing to inform controller of success." This
bug was harmless unless Tor is running under a controller
like Vidalia, in which case the controller would never get a
REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
fixes bug 1172.
- Make directory authorities more accurate at recording when
relays that have failed several reachability tests became
unreachable, so we can provide more accuracy at assigning Stable,
Guard, HSDir, etc flags. Bugfix on 0.2.0.6-alpha. Resolves bug 2716.
- Fix an issue that prevented static linking of libevent on
some platforms (notably Linux). Fixes bug 2698; bugfix on
versions 0.2.1.23/0.2.2.8-alpha (the versions introducing
the --with-static-libevent configure option).
- We now ask the other side of a stream (the client or the exit)
for more data on that stream when the amount of queued data on
that stream dips low enough. Previously, we wouldn't ask the
other side for more data until either it sent us more data (which
it wasn't supposed to do if it had exhausted its window!) or we
had completely flushed all our queued data. This flow control fix
should improve throughput. Fixes bug 2756; bugfix on the earliest
released versions of Tor (svn commit r152).
- Avoid a double-mark-for-free warning when failing to attach a
transparent proxy connection. (We thought we had fixed this in
0.2.2.23-alpha, but it turns out our fix was checking the wrong
connection.) Fixes bug 2757; bugfix on 0.1.2.1-alpha (the original
bug) and 0.2.2.23-alpha (the incorrect fix).
- When warning about missing zlib development packages during compile,
give the correct package names. Bugfix on 0.2.0.1-alpha.
o Minor features:
- Directory authorities now log the source of a rejected POSTed v3
networkstatus vote.
- Make compilation with clang possible when using
--enable-gcc-warnings by removing two warning options that clang
hasn't implemented yet and by fixing a few warnings. Implements
ticket 2696.
- When expiring circuits, use microsecond timers rather than
one-second timers. This can avoid an unpleasant situation where a
circuit is launched near the end of one second and expired right
near the beginning of the next, and prevent fluctuations in circuit
timeout values.
- Use computed circuit-build timeouts to decide when to launch
parallel introduction circuits for hidden services. (Previously,
we would retry after 15 seconds.)
- Update to the April 1 2011 Maxmind GeoLite Country database.
o Packaging fixes:
- Create the /var/run/tor directory on startup on OpenSUSE if it is
not already created. Patch from Andreas Stieger. Fixes bug 2573.
o Documentation changes:
- Modernize the doxygen configuration file slightly. Fixes bug 2707.
- Resolve all doxygen warnings except those for missing documentation.
Fixes bug 2705.
- Add doxygen documentation for more functions, fields, and types.
Changes in version 0.2.2.23-alpha - 2011-03-08
Tor 0.2.2.23-alpha lets relays record their bandwidth history so when
they restart they don't lose their bandwidth capacity estimate. This
release also fixes a diverse set of user-facing bugs, ranging from
relays overrunning their rate limiting to clients falsely warning about
clock skew to bridge descriptor leaks by our bridge directory authority.
o Major bugfixes:
- Stop sending a CLOCK_SKEW controller status event whenever
we fetch directory information from a relay that has a wrong clock.
Instead, only inform the controller when it's a trusted authority
that claims our clock is wrong. Bugfix on 0.1.2.6-alpha; fixes
the rest of bug 1074.
- Fix an assert in parsing router descriptors containing IPv6
addresses. This one took down the directory authorities when
somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
- Make the bridge directory authority refuse to answer directory
requests for "all" descriptors. It used to include bridge
descriptors in its answer, which was a major information leak.
Found by "piebeer". Bugfix on 0.2.0.3-alpha.
- If relays set RelayBandwidthBurst but not RelayBandwidthRate,
Tor would ignore their RelayBandwidthBurst setting,
potentially using more bandwidth than expected. Bugfix on
0.2.0.1-alpha. Reported by Paul Wouters. Fixes bug 2470.
- Ignore and warn if the user mistakenly sets "PublishServerDescriptor
hidserv" in her torrc. The 'hidserv' argument never controlled
publication of hidden service descriptors. Bugfix on 0.2.0.1-alpha.
o Major features:
- Relays now save observed peak bandwidth throughput rates to their
state file (along with total usage, which was already saved)
so that they can determine their correct estimated bandwidth on
restart. Resolves bug 1863, where Tor relays would reset their
estimated bandwidth to 0 after restarting.
- Directory authorities now take changes in router IP address and
ORPort into account when determining router stability. Previously,
if a router changed its IP or ORPort, the authorities would not
treat it as having any downtime for the purposes of stability
calculation, whereas clients would experience downtime since the
change could take a while to propagate to them. Resolves issue 1035.
- Enable Address Space Layout Randomization (ASLR) and Data Execution
Prevention (DEP) by default on Windows to make it harder for
attackers to exploit vulnerabilities. Patch from John Brooks.
o Minor bugfixes (on 0.2.1.x and earlier):
- Fix a rare crash bug that could occur when a client was configured
with a large number of bridges. Fixes bug 2629; bugfix on
0.2.1.2-alpha. Bugfix by trac user "shitlei".
- Avoid a double mark-for-free warning when failing to attach a
transparent proxy connection. Bugfix on 0.1.2.1-alpha. Fixes
bug 2279.
- Correctly detect failure to allocate an OpenSSL BIO. Fixes bug 2378;
found by "cypherpunks". This bug was introduced before the first
Tor release, in svn commit r110.
- Country codes aren't supported in EntryNodes until 0.2.3.x, so
don't mention them in the manpage. Fixes bug 2450; issue
spotted by keb and G-Lo.
- Fix a bug in bandwidth history state parsing that could have been
triggered if a future version of Tor ever changed the timing
granularity at which bandwidth history is measured. Bugfix on
Tor 0.1.1.11-alpha.
- When a relay decides that its DNS is too broken for it to serve
as an exit server, it advertised itself as a non-exit, but
continued to act as an exit. This could create accidental
partitioning opportunities for users. Instead, if a relay is
going to advertise reject *:* as its exit policy, it should
really act with exit policy "reject *:*". Fixes bug 2366.
Bugfix on Tor 0.1.2.5-alpha. Bugfix by user "postman" on trac.
- In the special case where you configure a public exit relay as your
bridge, Tor would be willing to use that exit relay as the last
hop in your circuit as well. Now we fail that circuit instead.
Bugfix on 0.2.0.12-alpha. Fixes bug 2403. Reported by "piebeer".
- Fix a bug with our locking implementation on Windows that couldn't
correctly detect when a file was already locked. Fixes bug 2504,
bugfix on 0.2.1.6-alpha.
- Fix IPv6-related connect() failures on some platforms (BSD, OS X).
Bugfix on 0.2.0.3-alpha; fixes first part of bug 2660. Patch by
"piebeer".
- Set target port in get_interface_address6() correctly. Bugfix
on 0.1.1.4-alpha and 0.2.0.3-alpha; fixes second part of bug 2660.
- Directory authorities are now more robust to hops back in time
when calculating router stability. Previously, if a run of uptime
or downtime appeared to be negative, the calculation could give
incorrect results. Bugfix on 0.2.0.6-alpha; noticed when fixing
bug 1035.
- Fix an assert that got triggered when using the TestingTorNetwork
configuration option and then issuing a GETINFO config-text control
command. Fixes bug 2250; bugfix on 0.2.1.2-alpha.
o Minor bugfixes (on 0.2.2.x):
- Clients should not weight BadExit nodes as Exits in their node
selection. Similarly, directory authorities should not count BadExit
bandwidth as Exit bandwidth when computing bandwidth-weights.
Bugfix on 0.2.2.10-alpha; fixes bug 2203.
- Correctly clear our dir_read/dir_write history when there is an
error parsing any bw history value from the state file. Bugfix on
Tor 0.2.2.15-alpha.
- Resolve a bug in verifying signatures of directory objects
with digests longer than SHA1. Bugfix on 0.2.2.20-alpha.
Fixes bug 2409. Found by "piebeer".
- Bridge authorities no longer crash on SIGHUP when they try to
publish their relay descriptor to themselves. Fixes bug 2572. Bugfix
on 0.2.2.22-alpha.
o Minor features:
- Log less aggressively about circuit timeout changes, and improve
some other circuit timeout messages. Resolves bug 2004.
- Log a little more clearly about the times at which we're no longer
accepting new connections. Resolves bug 2181.
- Reject attempts at the client side to open connections to private
IP addresses (like 127.0.0.1, 10.0.0.1, and so on) with
a randomly chosen exit node. Attempts to do so are always
ill-defined, generally prevented by exit policies, and usually
in error. This will also help to detect loops in transparent
proxy configurations. You can disable this feature by setting
"ClientRejectInternalAddresses 0" in your torrc.
- Always treat failure to allocate an RSA key as an unrecoverable
allocation error.
- Update to the March 1 2011 Maxmind GeoLite Country database.
o Minor features (log subsystem):
- Add documentation for configuring logging at different severities in
different log domains. We've had this feature since 0.2.1.1-alpha,
but for some reason it never made it into the manpage. Fixes
bug 2215.
- Make it simpler to specify "All log domains except for A and B".
Previously you needed to say "[*,~A,~B]". Now you can just say
"[~A,~B]".
- Add a "LogMessageDomains 1" option to include the domains of log
messages along with the messages. Without this, there's no way
to use log domains without reading the source or doing a lot
of guessing.
o Packaging changes:
- Stop shipping the Tor specs files and development proposal documents
in the tarball. They are now in a separate git repository at
git://git.torproject.org/torspec.git
Changes in version 0.2.1.30 - 2011-02-23
Tor 0.2.1.30 fixes a variety of less critical bugs. The main other
change is a slight tweak to Tor's TLS handshake that makes relays
and bridges that run this new version reachable from Iran again.
We don't expect this tweak will win the arms race long-term, but it
buys us time until we roll out a better solution.
o Major bugfixes:
- Stop sending a CLOCK_SKEW controller status event whenever
we fetch directory information from a relay that has a wrong clock.
Instead, only inform the controller when it's a trusted authority
that claims our clock is wrong. Bugfix on 0.1.2.6-alpha; fixes
the rest of bug 1074.
- Fix a bounds-checking error that could allow an attacker to
remotely crash a directory authority. Bugfix on 0.2.1.5-alpha.
Found by "piebeer".
- If relays set RelayBandwidthBurst but not RelayBandwidthRate,
Tor would ignore their RelayBandwidthBurst setting,
potentially using more bandwidth than expected. Bugfix on
0.2.0.1-alpha. Reported by Paul Wouters. Fixes bug 2470.
- Ignore and warn if the user mistakenly sets "PublishServerDescriptor
hidserv" in her torrc. The 'hidserv' argument never controlled
publication of hidden service descriptors. Bugfix on 0.2.0.1-alpha.
o Minor features:
- Adjust our TLS Diffie-Hellman parameters to match those used by
Apache's mod_ssl.
- Update to the February 1 2011 Maxmind GeoLite Country database.
o Minor bugfixes:
- Check for and reject overly long directory certificates and
directory tokens before they have a chance to hit any assertions.
Bugfix on 0.2.1.28. Found by "doorss".
- Bring the logic that gathers routerinfos and assesses the
acceptability of circuits into line. This prevents a Tor OP from
getting locked in a cycle of choosing its local OR as an exit for a
path (due to a .exit request) and then rejecting the circuit because
its OR is not listed yet. It also prevents Tor clients from using an
OR running in the same instance as an exit (due to a .exit request)
if the OR does not meet the same requirements expected of an OR
running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
o Packaging changes:
- Stop shipping the Tor specs files and development proposal documents
in the tarball. They are now in a separate git repository at
git://git.torproject.org/torspec.git
- Do not include Git version tags as though they are SVN tags when
generating a tarball from inside a repository that has switched
between branches. Bugfix on 0.2.1.15-rc; fixes bug 2402.
Changes in version 0.2.2.22-alpha - 2011-01-25
Tor 0.2.2.22-alpha fixes a few more less-critical security issues. The
main other change is a slight tweak to Tor's TLS handshake that makes
relays and bridges that run this new version reachable from Iran again.
We don't expect this tweak will win the arms race long-term, but it
will buy us a bit more time until we roll out a better solution.
o Major bugfixes:
- Fix a bounds-checking error that could allow an attacker to
remotely crash a directory authority. Bugfix on 0.2.1.5-alpha.
Found by "piebeer".
- Don't assert when changing from bridge to relay or vice versa
via the controller. The assert happened because we didn't properly
initialize our keys in this case. Bugfix on 0.2.2.18-alpha; fixes
bug 2433. Reported by bastik.
o Minor features:
- Adjust our TLS Diffie-Hellman parameters to match those used by
Apache's mod_ssl.
- Provide a log message stating which geoip file we're parsing
instead of just stating that we're parsing the geoip file.
Implements ticket 2432.
o Minor bugfixes:
- Check for and reject overly long directory certificates and
directory tokens before they have a chance to hit any assertions.
Bugfix on 0.2.1.28 / 0.2.2.20-alpha. Found by "doorss".
Changes in version 0.2.2.21-alpha - 2011-01-15
Tor 0.2.2.21-alpha includes all the patches from Tor 0.2.1.29, which
continues our recent code security audit work. The main fix resolves
a remote heap overflow vulnerability that can allow remote code
execution (CVE-2011-0427). Other fixes address a variety of assert
and crash bugs, most of which we think are hard to exploit remotely.
o Major bugfixes (security), also included in 0.2.1.29:
- Fix a heap overflow bug where an adversary could cause heap
corruption. This bug probably allows remote code execution
attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
0.1.2.10-rc.
- Prevent a denial-of-service attack by disallowing any
zlib-compressed data whose compression factor is implausibly
high. Fixes part of bug 2324; reported by "doorss".
- Zero out a few more keys in memory before freeing them. Fixes
bug 2384 and part of bug 2385. These key instances found by
"cypherpunks", based on Andrew Case's report about being able
to find sensitive data in Tor's memory space if you have enough
permissions. Bugfix on 0.0.2pre9.
o Major bugfixes (crashes), also included in 0.2.1.29:
- Prevent calls to Libevent from inside Libevent log handlers.
This had potential to cause a nasty set of crashes, especially
if running Libevent with debug logging enabled, and running
Tor with a controller watching for low-severity log messages.
Bugfix on 0.1.0.2-rc. Fixes bug 2190.
- Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
underflow errors there too. Fixes the other part of bug 2324.
- Fix a bug where we would assert if we ever had a
cached-descriptors.new file (or another file read directly into
memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
on 0.2.1.25. Found by doorss.
- Fix some potential asserts and parsing issues with grossly
malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
Found by doorss.
o Minor bugfixes (other), also included in 0.2.1.29:
- Fix a bug with handling misformed replies to reverse DNS lookup
requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
bug reported by doorss.
- Fix compilation on mingw when a pthreads compatibility library
has been installed. (We don't want to use it, so we shouldn't
be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
- Fix a bug where we would declare that we had run out of virtual
addresses when the address space was only half-exhausted. Bugfix
on 0.1.2.1-alpha.
- Correctly handle the case where AutomapHostsOnResolve is set but
no virtual addresses are available. Fixes bug 2328; bugfix on
0.1.2.1-alpha. Bug found by doorss.
- Correctly handle wrapping around when we run out of virtual
address space. Found by cypherpunks; bugfix on 0.2.0.5-alpha.
o Minor features, also included in 0.2.1.29:
- Update to the January 1 2011 Maxmind GeoLite Country database.
- Introduce output size checks on all of our decryption functions.
o Build changes, also included in 0.2.1.29:
- Tor does not build packages correctly with Automake 1.6 and earlier;
added a check to Makefile.am to make sure that we're building with
Automake 1.7 or later.
- The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
because we built it with a too-old version of automake. Thus that
release broke ./configure --enable-openbsd-malloc, which is popular
among really fast exit relays on Linux.
o Major bugfixes, new in 0.2.2.21-alpha:
- Prevent crash/heap corruption when the cbtnummodes consensus
parameter is set to 0 or large values. Fixes bug 2317; bugfix
on 0.2.2.14-alpha.
o Major features, new in 0.2.2.21-alpha:
- Introduce minimum/maximum values that clients will believe
from the consensus. Now we'll have a better chance to avoid crashes
or worse when a consensus param has a weird value.
o Minor features, new in 0.2.2.21-alpha:
- Make sure to disable DirPort if running as a bridge. DirPorts aren't
used on bridges, and it makes bridge scanning somewhat easier.
- If writing the state file to disk fails, wait up to an hour before
retrying again, rather than trying again each second. Fixes bug
2346; bugfix on Tor 0.1.1.3-alpha.
- Make Libevent log messages get delivered to controllers later,
and not from inside the Libevent log handler. This prevents unsafe
reentrant Libevent calls while still letting the log messages
get through.
- Detect platforms that brokenly use a signed size_t, and refuse to
build there. Found and analyzed by doorss and rransom.
- Fix a bunch of compile warnings revealed by mingw with gcc 4.5.
Resolves bug 2314.
o Minor bugfixes, new in 0.2.2.21-alpha:
- Handle SOCKS messages longer than 128 bytes long correctly, rather
than waiting forever for them to finish. Fixes bug 2330; bugfix
on 0.2.0.16-alpha. Found by doorss.
- Add assertions to check for overflow in arguments to
base32_encode() and base32_decode(); fix a signed-unsigned
comparison there too. These bugs are not actually reachable in Tor,
but it's good to prevent future errors too. Found by doorss.
- Correctly detect failures to create DNS requests when using Libevent
versions before v2. (Before Libevent 2, we used our own evdns
implementation. Its return values for Libevent's evdns_resolve_*()
functions are not consistent with those from Libevent.) Fixes bug
2363; bugfix on 0.2.2.6-alpha. Found by "lodger".
o Documentation, new in 0.2.2.21-alpha:
- Document the default socks host and port (127.0.0.1:9050) for
tor-resolve.
Changes in version 0.2.1.29 - 2011-01-15
Tor 0.2.1.29 continues our recent code security audit work. The main
fix resolves a remote heap overflow vulnerability that can allow remote
code execution. Other fixes address a variety of assert and crash bugs,
most of which we think are hard to exploit remotely.
o Major bugfixes (security):
- Fix a heap overflow bug where an adversary could cause heap
corruption. This bug probably allows remote code execution
attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
0.1.2.10-rc.
- Prevent a denial-of-service attack by disallowing any
zlib-compressed data whose compression factor is implausibly
high. Fixes part of bug 2324; reported by "doorss".
- Zero out a few more keys in memory before freeing them. Fixes
bug 2384 and part of bug 2385. These key instances found by
"cypherpunks", based on Andrew Case's report about being able
to find sensitive data in Tor's memory space if you have enough
permissions. Bugfix on 0.0.2pre9.
o Major bugfixes (crashes):
- Prevent calls to Libevent from inside Libevent log handlers.
This had potential to cause a nasty set of crashes, especially
if running Libevent with debug logging enabled, and running
Tor with a controller watching for low-severity log messages.
Bugfix on 0.1.0.2-rc. Fixes bug 2190.
- Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
underflow errors there too. Fixes the other part of bug 2324.
- Fix a bug where we would assert if we ever had a
cached-descriptors.new file (or another file read directly into
memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
on 0.2.1.25. Found by doorss.
- Fix some potential asserts and parsing issues with grossly
malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
Found by doorss.
o Minor bugfixes (other):
- Fix a bug with handling misformed replies to reverse DNS lookup
requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
bug reported by doorss.
- Fix compilation on mingw when a pthreads compatibility library
has been installed. (We don't want to use it, so we shouldn't
be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
- Fix a bug where we would declare that we had run out of virtual
addresses when the address space was only half-exhausted. Bugfix
on 0.1.2.1-alpha.
- Correctly handle the case where AutomapHostsOnResolve is set but
no virtual addresses are available. Fixes bug 2328; bugfix on
0.1.2.1-alpha. Bug found by doorss.
- Correctly handle wrapping around to when we run out of virtual
address space. Found by cypherpunks, bugfix on 0.2.0.5-alpha.
- The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
because we built it with a too-old version of automake. Thus that
release broke ./configure --enable-openbsd-malloc, which is popular
among really fast exit relays on Linux.
o Minor features:
- Update to the January 1 2011 Maxmind GeoLite Country database.
- Introduce output size checks on all of our decryption functions.
o Build changes:
- Tor does not build packages correctly with Automake 1.6 and earlier;
added a check to Makefile.am to make sure that we're building with
Automake 1.7 or later.
Changes in version 0.2.2.20-alpha - 2010-12-17
Tor 0.2.2.20-alpha does some code cleanup to reduce the risk of remotely
exploitable bugs. We also fix a variety of other significant bugs,
change the IP address for one of our directory authorities, and update
the minimum version that Tor relays must run to join the network.
o Major bugfixes:
- Fix a remotely exploitable bug that could be used to crash instances
of Tor remotely by overflowing on the heap. Remote-code execution
hasn't been confirmed, but can't be ruled out. Everyone should
upgrade. Bugfix on the 0.1.1 series and later.
- Fix a bug that could break accounting on 64-bit systems with large
time_t values, making them hibernate for impossibly long intervals.
Fixes bug 2146. Bugfix on 0.0.9pre6; fix by boboper.
- Fix a logic error in directory_fetches_from_authorities() that
would cause all _non_-exits refusing single-hop-like circuits
to fetch from authorities, when we wanted to have _exits_ fetch
from authorities. Fixes more of 2097. Bugfix on 0.2.2.16-alpha;
fix by boboper.
- Fix a stream fairness bug that would cause newer streams on a given
circuit to get preference when reading bytes from the origin or
destination. Fixes bug 2210. Fix by Mashael AlSabah. This bug was
introduced before the first Tor release, in svn revision r152.
o Directory authority changes:
- Change IP address and ports for gabelmoo (v3 directory authority).
o Minor bugfixes:
- Avoid crashes when AccountingMax is set on clients. Fixes bug 2235.
Bugfix on 0.2.2.18-alpha. Diagnosed by boboper.
- Fix an off-by-one error in calculating some controller command
argument lengths. Fortunately, this mistake is harmless since
the controller code does redundant NUL termination too. Found by
boboper. Bugfix on 0.1.1.1-alpha.
- Do not dereference NULL if a bridge fails to build its
extra-info descriptor. Found by an anonymous commenter on
Trac. Bugfix on 0.2.2.19-alpha.
o Minor features:
- Update to the December 1 2010 Maxmind GeoLite Country database.
- Directory authorities now reject relays running any versions of
Tor between 0.2.1.3-alpha and 0.2.1.18 inclusive; they have
known bugs that keep RELAY_EARLY cells from working on rendezvous
circuits. Followup to fix for bug 2081.
- Directory authorities now reject relays running any version of Tor
older than 0.2.0.26-rc. That version is the earliest that fetches
current directory information correctly. Fixes bug 2156.
- Report only the top 10 ports in exit-port stats in order not to
exceed the maximum extra-info descriptor length of 50 KB. Implements
task 2196.
Changes in version 0.2.1.28 - 2010-12-17
Tor 0.2.1.28 does some code cleanup to reduce the risk of remotely
exploitable bugs. We also took this opportunity to change the IP address
for one of our directory authorities, and to update the geoip database
we ship.
o Major bugfixes:
- Fix a remotely exploitable bug that could be used to crash instances
of Tor remotely by overflowing on the heap. Remote-code execution
hasn't been confirmed, but can't be ruled out. Everyone should
upgrade. Bugfix on the 0.1.1 series and later.
o Directory authority changes:
- Change IP address and ports for gabelmoo (v3 directory authority).
o Minor features:
- Update to the December 1 2010 Maxmind GeoLite Country database.
Changes in version 0.2.1.27 - 2010-11-23
Yet another OpenSSL security patch broke its compatibility with Tor:
Tor 0.2.1.27 makes relays work with openssl 0.9.8p and 1.0.0.b. We
also took this opportunity to fix several crash bugs, integrate a new
directory authority, and update the bundled GeoIP database.
o Major bugfixes:
- Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
No longer set the tlsext_host_name extension on server SSL objects;
but continue to set it on client SSL objects. Our goal in setting
it was to imitate a browser, not a vhosting server. Fixes bug 2204;
bugfix on 0.2.1.1-alpha.
- Do not log messages to the controller while shrinking buffer
freelists. Doing so would sometimes make the controller connection
try to allocate a buffer chunk, which would mess up the internals
of the freelist and cause an assertion failure. Fixes bug 1125;
fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
- Learn our external IP address when we're a relay or bridge, even if
we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
where we introduced bridge relays that don't need to publish to
be useful. Fixes bug 2050.
- Do even more to reject (and not just ignore) annotations on
router descriptors received anywhere but from the cache. Previously
we would ignore such annotations at first, but cache them to disk
anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
- When you're using bridges and your network goes away and your
bridges get marked as down, recover when you attempt a new socks
connection (if the network is back), rather than waiting up to an
hour to try fetching new descriptors for your bridges. Bugfix on
0.2.0.3-alpha; fixes bug 1981.
o Major features:
- Move to the November 2010 Maxmind GeoLite country db (rather
than the June 2009 ip-to-country GeoIP db) for our statistics that
count how many users relays are seeing from each country. Now we'll
have more accurate data, especially for many African countries.
o New directory authorities:
- Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
authority.
o Minor bugfixes:
- Fix an assertion failure that could occur in directory caches or
bridge users when using a very short voting interval on a testing
network. Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on
0.2.0.8-alpha.
- Enforce multiplicity rules when parsing annotations. Bugfix on
0.2.0.8-alpha. Found by piebeer.
- Allow handshaking OR connections to take a full KeepalivePeriod
seconds to handshake. Previously, we would close them after
IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
for analysis help.
- When building with --enable-gcc-warnings on OpenBSD, disable
warnings in system headers. This makes --enable-gcc-warnings
pass on OpenBSD 4.8.
o Minor features:
- Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
stream ending reason for this case: END_STREAM_REASON_NOROUTE.
Servers can start sending this code when enough clients recognize
it. Bugfix on 0.1.0.1-rc; fixes part of bug 1793.
- Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
Patch from mingw-san.
o Removed files:
- Remove the old debian/ directory from the main Tor distribution.
The official Tor-for-debian git repository lives at the URL
https://git.torproject.org/debian/tor.git
- Stop shipping the old doc/website/ directory in the tarball. We
changed the website format in late 2010, and what we shipped in
0.2.1.26 really wasn't that useful anyway.
Changes in version 0.2.2.19-alpha - 2010-11-22
Yet another OpenSSL security patch broke its compatibility with Tor:
Tor 0.2.2.19-alpha makes relays work with OpenSSL 0.9.8p and 1.0.0.b.
o Major bugfixes:
- Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
No longer set the tlsext_host_name extension on server SSL objects;
but continue to set it on client SSL objects. Our goal in setting
it was to imitate a browser, not a vhosting server. Fixes bug 2204;
bugfix on 0.2.1.1-alpha.
o Minor bugfixes:
- Try harder not to exceed the maximum length of 50 KB when writing
statistics to extra-info descriptors. This bug was triggered by very
fast relays reporting exit-port, entry, and dirreq statistics.
Reported by Olaf Selke. Bugfix on 0.2.2.1-alpha. Fixes bug 2183.
- Publish a router descriptor even if generating an extra-info
descriptor fails. Previously we would not publish a router
descriptor without an extra-info descriptor; this can cause fast
exit relays collecting exit-port statistics to drop from the
consensus. Bugfix on 0.1.2.9-rc; fixes bug 2195.
Changes in version 0.2.2.18-alpha - 2010-11-16
Tor 0.2.2.18-alpha fixes several crash bugs that have been nagging
us lately, makes unpublished bridge relays able to detect their IP
address, and fixes a wide variety of other bugs to get us much closer
to a stable release.
o Major bugfixes:
- Do even more to reject (and not just ignore) annotations on
router descriptors received anywhere but from the cache. Previously
we would ignore such annotations at first, but cache them to disk
anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
- Do not log messages to the controller while shrinking buffer
freelists. Doing so would sometimes make the controller connection
try to allocate a buffer chunk, which would mess up the internals
of the freelist and cause an assertion failure. Fixes bug 1125;
fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
- Learn our external IP address when we're a relay or bridge, even if
we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
where we introduced bridge relays that don't need to publish to
be useful. Fixes bug 2050.
- Maintain separate TLS contexts and certificates for incoming and
outgoing connections in bridge relays. Previously we would use the
same TLS contexts and certs for incoming and outgoing connections.
Bugfix on 0.2.0.3-alpha; addresses bug 988.
- Maintain separate identity keys for incoming and outgoing TLS
contexts in bridge relays. Previously we would use the same
identity keys for incoming and outgoing TLS contexts. Bugfix on
0.2.0.3-alpha; addresses the other half of bug 988.
- Avoid an assertion failure when we as an authority receive a
duplicate upload of a router descriptor that we already have,
but which we previously considered an obsolete descriptor.
Fixes another case of bug 1776. Bugfix on 0.2.2.16-alpha.
- Avoid a crash bug triggered by looking at a dangling pointer while
setting the network status consensus. Found by Robert Ransom.
Bugfix on 0.2.2.17-alpha. Fixes bug 2097.
- Fix a logic error where servers that _didn't_ act as exits would
try to keep their server lists more aggressively up to date than
exits, when it was supposed to be the other way around. Bugfix
on 0.2.2.17-alpha.
o Minor bugfixes (on Tor 0.2.1.x and earlier):
- When we're trying to guess whether we know our IP address as
a relay, we would log various ways that we failed to guess
our address, but never log that we ended up guessing it
successfully. Now add a log line to help confused and anxious
relay operators. Bugfix on 0.1.2.1-alpha; fixes bug 1534.
- Bring the logic that gathers routerinfos and assesses the
acceptability of circuits into line. This prevents a Tor OP from
getting locked in a cycle of choosing its local OR as an exit for a
path (due to a .exit request) and then rejecting the circuit because
its OR is not listed yet. It also prevents Tor clients from using an
OR running in the same instance as an exit (due to a .exit request)
if the OR does not meet the same requirements expected of an OR
running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
- Correctly describe errors that occur when generating a TLS object.
Previously we would attribute them to a failure while generating a
TLS context. Patch by Robert Ransom. Bugfix on 0.1.0.4-rc; fixes
bug 1994.
- Enforce multiplicity rules when parsing annotations. Bugfix on
0.2.0.8-alpha. Found by piebeer.
- Fix warnings that newer versions of autoconf produced during
./autogen.sh. These warnings appear to be harmless in our case,
but they were extremely verbose. Fixes bug 2020.
o Minor bugfixes (on Tor 0.2.2.x):
- Enable protection of small arrays whenever we build with gcc
hardening features, not only when also building with warnings
enabled. Fixes bug 2031; bugfix on 0.2.2.14-alpha. Reported by keb.
o Minor features:
- Make hidden services work better in private Tor networks by not
requiring any uptime to join the hidden service descriptor
DHT. Implements ticket 2088.
- Rate-limit the "your application is giving Tor only an IP address"
warning. Addresses bug 2000; bugfix on 0.0.8pre2.
- When AllowSingleHopExits is set, print a warning to explain to the
relay operator why most clients are avoiding her relay.
- Update to the November 1 2010 Maxmind GeoLite Country database.
o Code simplifications and refactoring:
- When we fixed bug 1038 we had to put in a restriction not to send
RELAY_EARLY cells on rend circuits. This was necessary as long
as relays using Tor 0.2.1.3-alpha through 0.2.1.18-alpha were
active. Now remove this obsolete check. Resolves bug 2081.
- Some options used different conventions for uppercasing of acronyms
when comparing manpage and source. Fix those in favor of the
manpage, as it makes sense to capitalize acronyms.
- Remove the torrc.complete file. It hasn't been kept up to date
and users will have better luck checking out the manpage.
- Remove the obsolete "NoPublish" option; it has been flagged
as obsolete and has produced a warning since 0.1.1.18-rc.
- Remove everything related to building the expert bundle for OS X.
It has confused many users, doesn't work right on OS X 10.6,
and is hard to get rid of once installed. Resolves bug 1274.
Changes in version 0.2.2.17-alpha - 2010-09-30
Tor 0.2.2.17-alpha introduces a feature to make it harder for clients
to use one-hop circuits (which can put the exit relays at higher risk,
plus unbalance the network); fixes a big bug in bandwidth accounting
for relays that want to limit their monthly bandwidth use; fixes a
big pile of bugs in how clients tolerate temporary network failure;
and makes our adaptive circuit build timeout feature (which improves
client performance if your network is fast while not breaking things
if your network is slow) better handle bad networks.
o Major features:
- Exit relays now try harder to block exit attempts from unknown
relays, to make it harder for people to use them as one-hop proxies
a la tortunnel. Controlled by the refuseunknownexits consensus
parameter (currently enabled), or you can override it on your
relay with the RefuseUnknownExits torrc option. Resolves bug 1751.
o Major bugfixes (0.2.1.x and earlier):
- Fix a bug in bandwidth accounting that could make us use twice
the intended bandwidth when our interval start changes due to
daylight saving time. Now we tolerate skew in stored vs computed
interval starts: if the start of the period changes by no more than
50% of the period's duration, we remember bytes that we transferred
in the old period. Fixes bug 1511; bugfix on 0.0.9pre5.
- Always search the Windows system directory for system DLLs, and
nowhere else. Bugfix on 0.1.1.23; fixes bug 1954.
- When you're using bridges and your network goes away and your
bridges get marked as down, recover when you attempt a new socks
connection (if the network is back), rather than waiting up to an
hour to try fetching new descriptors for your bridges. Bugfix on
0.2.0.3-alpha; fixes bug 1981.
o Major bugfixes (on 0.2.2.x):
- Fix compilation on Windows. Bugfix on 0.2.2.16-alpha; related to
bug 1797.
- Fix a segfault that could happen when operating a bridge relay with
no GeoIP database set. Fixes bug 1964; bugfix on 0.2.2.15-alpha.
- The consensus bandwidth-weights (used by clients to choose fast
relays) entered an unexpected edge case in September where
Exits were much scarcer than Guards, resulting in bad weight
recommendations. Now we compute them using new constraints that
should succeed in all cases. Also alter directory authorities to
not include the bandwidth-weights line if they fail to produce
valid values. Fixes bug 1952; bugfix on 0.2.2.10-alpha.
- When weighting bridges during path selection, we used to trust
the bandwidths they provided in their descriptor, only capping them
at 10MB/s. This turned out to be problematic for two reasons:
Bridges could claim to handle a lot more traffic then they
actually would, thus making more clients pick them and have a
pretty effective DoS attack. The other issue is that new bridges
that might not have a good estimate for their bw capacity yet
would not get used at all unless no other bridges are available
to a client. Fixes bug 1912; bugfix on 0.2.2.7-alpha.
o Major bugfixes (on the circuit build timeout feature, 0.2.2.x):
- Ignore cannibalized circuits when recording circuit build times.
This should provide for a minor performance improvement for hidden
service users using 0.2.2.14-alpha, and should remove two spurious
notice log messages. Bugfix on 0.2.2.14-alpha; fixes bug 1740.
- Simplify the logic that causes us to decide if the network is
unavailable for purposes of recording circuit build times. If we
receive no cells whatsoever for the entire duration of a circuit's
full measured lifetime, the network is probably down. Also ignore
one-hop directory fetching circuit timeouts when calculating our
circuit build times. These changes should hopefully reduce the
cases where we see ridiculous circuit build timeouts for people
with spotty wireless connections. Fixes part of bug 1772; bugfix
on 0.2.2.2-alpha.
- Prevent the circuit build timeout from becoming larger than
the maximum build time we have ever seen. Also, prevent the time
period for measurement circuits from becoming larger than twice that
value. Fixes the other part of bug 1772; bugfix on 0.2.2.2-alpha.
o Minor features:
- When we run out of directory information such that we can't build
circuits, but then get enough that we can build circuits, log when
we actually construct a circuit, so the user has a better chance of
knowing what's going on. Fixes bug 1362.
- Be more generous with how much bandwidth we'd use up (with
accounting enabled) before entering "soft hibernation". Previously,
we'd refuse new connections and circuits once we'd used up 95% of
our allotment. Now, we use up 95% of our allotment, AND make sure
that we have no more than 500MB (or 3 hours of expected traffic,
whichever is lower) remaining before we enter soft hibernation.
- If we've configured EntryNodes and our network goes away and/or all
our entrynodes get marked down, optimistically retry them all when
a new socks application request appears. Fixes bug 1882.
- Add some more defensive programming for architectures that can't
handle unaligned integer accesses. We don't know of any actual bugs
right now, but that's the best time to fix them. Fixes bug 1943.
- Support line continuations in the torrc config file. If a line
ends with a single backslash character, the newline is ignored, and
the configuration value is treated as continuing on the next line.
Resolves bug 1929.
o Minor bugfixes (on 0.2.1.x and earlier):
- For bandwidth accounting, calculate our expected bandwidth rate
based on the time during which we were active and not in
soft-hibernation during the last interval. Previously, we were
also considering the time spent in soft-hibernation. If this
was a long time, we would wind up underestimating our bandwidth
by a lot, and skewing our wakeup time towards the start of the
accounting interval. Fixes bug 1789. Bugfix on 0.0.9pre5.
o Minor bugfixes (on 0.2.2.x):
- Resume generating CIRC FAILED REASON=TIMEOUT control port messages,
which were disabled by the circuit build timeout changes in
0.2.2.14-alpha. Bugfix on 0.2.2.14-alpha; fixes bug 1739.
- Make sure we don't warn about missing bandwidth weights when
choosing bridges or other relays not in the consensus. Bugfix on
0.2.2.10-alpha; fixes bug 1805.
- In our logs, do not double-report signatures from unrecognized
authorities both as "from unknown authority" and "not
present". Fixes bug 1956, bugfix on 0.2.2.16-alpha.
Changes in version 0.2.2.16-alpha - 2010-09-17
Tor 0.2.2.16-alpha fixes a variety of old stream fairness bugs (most
evident at exit relays), and also continues to resolve all the little
bugs that have been filling up trac lately.
o Major bugfixes (stream-level fairness):
- When receiving a circuit-level SENDME for a blocked circuit, try
to package cells fairly from all the streams that had previously
been blocked on that circuit. Previously, we had started with the
oldest stream, and allowed each stream to potentially exhaust
the circuit's package window. This gave older streams on any
given circuit priority over newer ones. Fixes bug 1937. Detected
originally by Camilo Viecco. This bug was introduced before the
first Tor release, in svn commit r152: it is the new winner of
the longest-lived bug prize.
- When the exit relay got a circuit-level sendme cell, it started
reading on the exit streams, even if had 500 cells queued in the
circuit queue already, so the circuit queue just grew and grew in
some cases. We fix this by not re-enabling reading on receipt of a
sendme cell when the cell queue is blocked. Fixes bug 1653. Bugfix
on 0.2.0.1-alpha. Detected by Mashael AlSabah. Original patch by
"yetonetime".
- Newly created streams were allowed to read cells onto circuits,
even if the circuit's cell queue was blocked and waiting to drain.
This created potential unfairness, as older streams would be
blocked, but newer streams would gladly fill the queue completely.
We add code to detect this situation and prevent any stream from
getting more than one free cell. Bugfix on 0.2.0.1-alpha. Partially
fixes bug 1298.
o Minor features:
- Update to the September 1 2010 Maxmind GeoLite Country database.
- Warn when CookieAuthFileGroupReadable is set but CookieAuthFile is
not. This would lead to a cookie that is still not group readable.
Closes bug 1843. Suggested by katmagic.
- When logging a rate-limited warning, we now mention how many messages
got suppressed since the last warning.
- Add new "perconnbwrate" and "perconnbwburst" consensus params to
do individual connection-level rate limiting of clients. The torrc
config options with the same names trump the consensus params, if
both are present. Replaces the old "bwconnrate" and "bwconnburst"
consensus params which were broken from 0.2.2.7-alpha through
0.2.2.14-alpha. Closes bug 1947.
- When a router changes IP address or port, authorities now launch
a new reachability test for it. Implements ticket 1899.
- Make the formerly ugly "2 unknown, 7 missing key, 0 good, 0 bad,
2 no signature, 4 required" messages about consensus signatures
easier to read, and make sure they get logged at the same severity
as the messages explaining which keys are which. Fixes bug 1290.
- Don't warn when we have a consensus that we can't verify because
of missing certificates, unless those certificates are ones
that we have been trying and failing to download. Fixes bug 1145.
- If you configure your bridge with a known identity fingerprint,
and the bridge authority is unreachable (as it is in at least
one country now), fall back to directly requesting the descriptor
from the bridge. Finishes the feature started in 0.2.0.10-alpha;
closes bug 1138.
- When building with --enable-gcc-warnings on OpenBSD, disable
warnings in system headers. This makes --enable-gcc-warnings
pass on OpenBSD 4.8.
o Minor bugfixes (on 0.2.1.x and earlier):
- Authorities will now attempt to download consensuses if their
own efforts to make a live consensus have failed. This change
means authorities that restart will fetch a valid consensus, and
it means authorities that didn't agree with the current consensus
will still fetch and serve it if it has enough signatures. Bugfix
on 0.2.0.9-alpha; fixes bug 1300.
- Ensure DNS requests launched by "RESOLVE" commands from the
controller respect the __LeaveStreamsUnattached setconf options. The
same goes for requests launched via DNSPort or transparent
proxying. Bugfix on 0.2.0.1-alpha; fixes bug 1525.
- Allow handshaking OR connections to take a full KeepalivePeriod
seconds to handshake. Previously, we would close them after
IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
for analysis help.
- Rate-limit "Failed to hand off onionskin" warnings.
- Never relay a cell for a circuit we have already destroyed.
Between marking a circuit as closeable and finally closing it,
it may have been possible for a few queued cells to get relayed,
even though they would have been immediately dropped by the next
OR in the circuit. Fixes bug 1184; bugfix on 0.2.0.1-alpha.
- Never queue a cell for a circuit that's already been marked
for close.
- Never vote for a server as "Running" if we have a descriptor for
it claiming to be hibernating, and that descriptor was published
more recently than our last contact with the server. Bugfix on
0.2.0.3-alpha; fixes bug 911.
- Squash a compile warning on OpenBSD. Reported by Tas; fixes
bug 1848.
o Minor bugfixes (on 0.2.2.x):
- Fix a regression introduced in 0.2.2.7-alpha that marked relays
down if a directory fetch fails and you've configured either
bridges or EntryNodes. The intent was to mark the relay as down
_unless_ you're using bridges or EntryNodes, since if you are
then you could quickly run out of entry points.
- Fix the Windows directory-listing code. A bug introduced in
0.2.2.14-alpha could make Windows directory servers forget to load
some of their cached v2 networkstatus files.
- Really allow clients to use relays as bridges. Fixes bug 1776;
bugfix on 0.2.2.15-alpha.
- Demote a warn to info that happens when the CellStatistics option
was just enabled. Bugfix on 0.2.2.15-alpha; fixes bug 1921.
Reported by Moritz Bartl.
- On Windows, build correctly either with or without Unicode support.
This is necessary so that Tor can support fringe platforms like
Windows 98 (which has no Unicode), or Windows CE (which has no
non-Unicode). Bugfix on 0.2.2.14-alpha; fixes bug 1797.
o Testing
- Add a unit test for cross-platform directory-listing code.
Changes in version 0.2.2.15-alpha - 2010-08-18
Tor 0.2.2.15-alpha fixes a big bug in hidden service availability,
fixes a variety of other bugs that were preventing performance
experiments from moving forward, fixes several bothersome memory leaks,
and generally closes a lot of smaller bugs that have been filling up
trac lately.
o Major bugfixes:
- Stop assigning the HSDir flag to relays that disable their
DirPort (and thus will refuse to answer directory requests). This
fix should dramatically improve the reachability of hidden services:
hidden services and hidden service clients pick six HSDir relays
to store and retrieve the hidden service descriptor, and currently
about half of the HSDir relays will refuse to work. Bugfix on
0.2.0.10-alpha; fixes part of bug 1693.
- The PerConnBWRate and Burst config options, along with the
bwconnrate and bwconnburst consensus params, initialized each conn's
token bucket values only when the connection is established. Now we
update them if the config options change, and update them every time
we get a new consensus. Otherwise we can encounter an ugly edge
case where we initialize an OR conn to client-level bandwidth,
but then later the relay joins the consensus and we leave it
throttled. Bugfix on 0.2.2.7-alpha; fixes bug 1830.
- Fix a regression that caused Tor to rebind its ports if it receives
SIGHUP while hibernating. Bugfix in 0.1.1.6-alpha; closes bug 919.
o Major features:
- Lower the maximum weighted-fractional-uptime cutoff to 98%. This
should give us approximately 40-50% more Guard-flagged nodes,
improving the anonymity the Tor network can provide and also
decreasing the dropoff in throughput that relays experience when
they first get the Guard flag.
- Allow enabling or disabling the *Statistics config options while
Tor is running.
o Minor features:
- Update to the August 1 2010 Maxmind GeoLite Country database.
- Have the controller interface give a more useful message than
"Internal Error" in response to failed GETINFO requests.
- Warn when the same option is provided more than once in a torrc
file, on the command line, or in a single SETCONF statement, and
the option is one that only accepts a single line. Closes bug 1384.
- Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
Patch from mingw-san.
- Add support for the country code "{??}" in torrc options like
ExcludeNodes, to indicate all routers of unknown country. Closes
bug 1094.
- Relays report the number of bytes spent on answering directory
requests in extra-info descriptors similar to {read,write}-history.
Implements enhancement 1790.
o Minor bugfixes (on 0.2.1.x and earlier):
- Complain if PublishServerDescriptor is given multiple arguments that
include 0 or 1. This configuration will be rejected in the future.
Bugfix on 0.2.0.1-alpha; closes bug 1107.
- Disallow BridgeRelay 1 and ORPort 0 at once in the configuration.
Bugfix on 0.2.0.13-alpha; closes bug 928.
- Change "Application request when we're believed to be offline."
notice to "Application request when we haven't used client
functionality lately.", to clarify that it's not an error. Bugfix
on 0.0.9.3; fixes bug 1222.
- Fix a bug in the controller interface where "GETINFO ns/asdaskljkl"
would return "551 Internal error" rather than "552 Unrecognized key
ns/asdaskljkl". Bugfix on 0.1.2.3-alpha.
- Users can't configure a regular relay to be their bridge. It didn't
work because when Tor fetched the bridge descriptor, it found
that it already had it, and didn't realize that the purpose of the
descriptor had changed. Now we replace routers with a purpose other
than bridge with bridge descriptors when fetching them. Bugfix on
0.1.1.9-alpha. Bug 1776 not yet fixed because now we immediately
refetch the descriptor with router purpose 'general', disabling
it as a bridge.
- Fix a rare bug in rend_fn unit tests: we would fail a test when
a randomly generated port is 0. Diagnosed by Matt Edman. Bugfix
on 0.2.0.10-alpha; fixes bug 1808.
- Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
stream ending reason for this case: END_STREAM_REASON_NOROUTE.
Servers can start sending this code when enough clients recognize
it. Also update the spec to reflect this new reason. Bugfix on
0.1.0.1-rc; fixes part of bug 1793.
- Delay geoip stats collection by bridges for 6 hours, not 2 hours,
when we switch from being a public relay to a bridge. Otherwise
there will still be clients that see the relay in their consensus,
and the stats will end up wrong. Bugfix on 0.2.1.15-rc; fixes bug
932 even more.
- Instead of giving an assertion failure on an internal mismatch
on estimated freelist size, just log a BUG warning and try later.
Mitigates but does not fix bug 1125.
- Fix an assertion failure that could occur in caches or bridge users
when using a very short voting interval on a testing network.
Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on 0.2.0.8-alpha.
o Minor bugfixes (on 0.2.2.x):
- Alter directory authorities to always consider Exit-flagged nodes
as potential Guard nodes in their votes. The actual decision to
use Exits as Guards is done in the consensus bandwidth weights.
Fixes bug 1294; bugfix on 0.2.2.10-alpha.
- When the controller is reporting the purpose of circuits that
didn't finish building before the circuit build timeout, it was
printing UNKNOWN_13. Now print EXPIRED. Bugfix on 0.2.2.14-alpha.
- Our libevent version parsing code couldn't handle versions like
1.4.14b-stable and incorrectly warned the user about using an
old and broken version of libevent. Treat 1.4.14b-stable like
1.4.14-stable when parsing the version. Fixes bug 1731; bugfix
on 0.2.2.1-alpha.
- Don't use substitution references like $(VAR:MOD) when
$(asciidoc_files) is empty -- make(1) on NetBSD transforms
'$(:x)' to 'x' rather than the empty string. This bites us in
doc/ when configured with --disable-asciidoc. Bugfix on
0.2.2.9-alpha; fixes bug 1773.
- Remove a spurious hidden service server-side log notice about
"Ancient non-dirty circuits". Bugfix on 0.2.2.14-alpha; fixes
bug 1741.
- Fix compilation with --with-dmalloc set. Bugfix on 0.2.2.6-alpha;
fixes bug 1832.
- Correctly report written bytes on linked connections. Found while
implementing 1790. Bugfix on 0.2.2.4-alpha.
- Fix three memory leaks: one in circuit_build_times_parse_state(),
one in dirvote_add_signatures_to_pending_consensus(), and one every
time we parse a v3 network consensus. Bugfixes on 0.2.2.14-alpha,
0.2.2.6-alpha, and 0.2.2.10-alpha respectively; fixes bug 1831.
o Code simplifications and refactoring:
- Take a first step towards making or.h smaller by splitting out
function definitions for all source files in src/or/. Leave
structures and defines in or.h for now.
- Remove a bunch of unused function declarations as well as a block of
#if 0'd code from the unit tests. Closes bug 1824.
- New unit tests for exit-port history statistics; refactored exit
statistics code to be more easily tested.
- Remove the old debian/ directory from the main Tor distribution.
The official Tor-for-debian git repository lives at the URL
https://git.torproject.org/debian/tor.git
Changes in version 0.2.2.14-alpha - 2010-07-12
Tor 0.2.2.14-alpha greatly improves client-side handling of
circuit build timeouts, which are used to estimate speed and improve
performance. We also move to a much better GeoIP database, port Tor to
Windows CE, introduce new compile flags that improve code security,
add an eighth v3 directory authority, and address a lot of more
minor issues.
o Major bugfixes:
- Tor directory authorities no longer crash when started with a
cached-microdesc-consensus file in their data directory. Bugfix
on 0.2.2.6-alpha; fixes bug 1532.
- Treat an unset $HOME like an empty $HOME rather than triggering an
assert. Bugfix on 0.0.8pre1; fixes bug 1522.
- Ignore negative and large circuit build timeout values that can
happen during a suspend or hibernate. These values caused various
asserts to fire. Bugfix on 0.2.2.2-alpha; fixes bug 1245.
- Alter calculation of Pareto distribution parameter 'Xm' for
Circuit Build Timeout learning to use the weighted average of the
top N=3 modes (because we have three entry guards). Considering
multiple modes should improve the timeout calculation in some cases,
and prevent extremely high timeout values. Bugfix on 0.2.2.2-alpha;
fixes bug 1335.
- Alter calculation of Pareto distribution parameter 'Alpha' to use a
right censored distribution model. This approach improves over the
synthetic timeout generation approach that was producing insanely
high timeout values. Now we calculate build timeouts using truncated
times. Bugfix on 0.2.2.2-alpha; fixes bugs 1245 and 1335.
- Do not close circuits that are under construction when they reach
the circuit build timeout. Instead, leave them building (but do not
use them) for up until the time corresponding to the 95th percentile
on the Pareto CDF or 60 seconds, whichever is greater. This is done
to provide better data for the new Pareto model. This percentile
can be controlled by the consensus.
o Major features:
- Move to the June 2010 Maxmind GeoLite country db (rather than the
June 2009 ip-to-country GeoIP db) for our statistics that count
how many users relays are seeing from each country. Now we have
more accurate data for many African countries.
- Port Tor to build and run correctly on Windows CE systems, using
the wcecompat library. Contributed by Valerio Lupi.
- New "--enable-gcc-hardening" ./configure flag (off by default)
to turn on gcc compile time hardening options. It ensures
that signed ints have defined behavior (-fwrapv), enables
-D_FORTIFY_SOURCE=2 (requiring -O2), adds stack smashing protection
with canaries (-fstack-protector-all), turns on ASLR protection if
supported by the kernel (-fPIE, -pie), and adds additional security
related warnings. Verified to work on Mac OS X and Debian Lenny.
- New "--enable-linker-hardening" ./configure flag (off by default)
to turn on ELF specific hardening features (relro, now). This does
not work with Mac OS X or any other non-ELF binary format.
o New directory authorities:
- Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
authority.
o Minor features:
- New config option "WarnUnsafeSocks 0" disables the warning that
occurs whenever Tor receives a socks handshake using a version of
the socks protocol that can only provide an IP address (rather
than a hostname). Setups that do DNS locally over Tor are fine,
and we shouldn't spam the logs in that case.
- Convert the HACKING file to asciidoc, and add a few new sections
to it, explaining how we use Git, how we make changelogs, and
what should go in a patch.
- Add a TIMEOUT_RATE keyword to the BUILDTIMEOUT_SET control port
event, to give information on the current rate of circuit timeouts
over our stored history.
- Add ability to disable circuit build time learning via consensus
parameter and via a LearnCircuitBuildTimeout config option. Also
automatically disable circuit build time calculation if we are
either a AuthoritativeDirectory, or if we fail to write our state
file. Fixes bug 1296.
- More gracefully handle corrupt state files, removing asserts
in favor of saving a backup and resetting state.
- Rename the "log.h" header to "torlog.h" so as to conflict with fewer
system headers.
o Minor bugfixes:
- Build correctly on OSX with zlib 1.2.4 and higher with all warnings
enabled.
- When a2x fails, mention that the user could disable manpages instead
of trying to fix their asciidoc installation.
- Where available, use Libevent 2.0's periodic timers so that our
once-per-second cleanup code gets called even more closely to
once per second than it would otherwise. Fixes bug 943.
- If you run a bridge that listens on multiple IP addresses, and
some user configures a bridge address that uses a different IP
address than your bridge writes in its router descriptor, and the
user doesn't specify an identity key, their Tor would discard the
descriptor because "it isn't one of our configured bridges", and
fail to bootstrap. Now believe the descriptor and bootstrap anyway.
Bugfix on 0.2.0.3-alpha.
- If OpenSSL fails to make a duplicate of a private or public key, log
an error message and try to exit cleanly. May help with debugging
if bug 1209 ever remanifests.
- Save a couple bytes in memory allocation every time we escape
certain characters in a string. Patch from Florian Zumbiehl.
- Make it explicit that we don't cannibalize one-hop circuits. This
happens in the wild, but doesn't turn out to be a problem because
we fortunately don't use those circuits. Many thanks to outofwords
for the initial analysis and to swissknife who confirmed that
two-hop circuits are actually created.
- Make directory mirrors report non-zero dirreq-v[23]-shares again.
Fixes bug 1564; bugfix on 0.2.2.9-alpha.
- Eliminate a case where a circuit build time warning was displayed
after network connectivity resumed. Bugfix on 0.2.2.2-alpha.
Changes in version 0.2.1.26 - 2010-05-02
Tor 0.2.1.26 addresses the recent connection and memory overload
problems we've been seeing on relays, especially relays with their
DirPort open. If your relay has been crashing, or you turned it off
because it used too many resources, give this release a try.
This release also fixes yet another instance of broken OpenSSL libraries
that was causing some relays to drop out of the consensus.
o Major bugfixes:
- Teach relays to defend themselves from connection overload. Relays
now close idle circuits early if it looks like they were intended
for directory fetches. Relays are also more aggressive about closing
TLS connections that have no circuits on them. Such circuits are
unlikely to be re-used, and tens of thousands of them were piling
up at the fast relays, causing the relays to run out of sockets
and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
their directory fetches over TLS).
- Fix SSL renegotiation behavior on OpenSSL versions like on Centos
that claim to be earlier than 0.9.8m, but which have in reality
backported huge swaths of 0.9.8m or 0.9.8n renegotiation
behavior. Possible fix for some cases of bug 1346.
- Directory mirrors were fetching relay descriptors only from v2
directory authorities, rather than v3 authorities like they should.
Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
o Minor bugfixes:
- Finally get rid of the deprecated and now harmful notion of "clique
mode", where directory authorities maintain TLS connections to
every other relay.
o Testsuite fixes:
- In the util/threads test, no longer free the test_mutex before all
worker threads have finished. Bugfix on 0.2.1.6-alpha.
- The master thread could starve the worker threads quite badly on
certain systems, causing them to run only partially in the allowed
window. This resulted in test failures. Now the master thread sleeps
occasionally for a few microseconds while the two worker-threads
compete for the mutex. Bugfix on 0.2.0.1-alpha.
Changes in version 0.2.2.13-alpha - 2010-04-24
Tor 0.2.2.13-alpha addresses the recent connection and memory overload
problems we've been seeing on relays, especially relays with their
DirPort open. If your relay has been crashing, or you turned it off
because it used too many resources, give this release a try.
o Major bugfixes:
- Teach relays to defend themselves from connection overload. Relays
now close idle circuits early if it looks like they were intended
for directory fetches. Relays are also more aggressive about closing
TLS connections that have no circuits on them. Such circuits are
unlikely to be re-used, and tens of thousands of them were piling
up at the fast relays, causing the relays to run out of sockets
and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
their directory fetches over TLS).
o Minor features:
- Finally get rid of the deprecated and now harmful notion of "clique
mode", where directory authorities maintain TLS connections to
every other relay.
- Directory authorities now do an immediate reachability check as soon
as they hear about a new relay. This change should slightly reduce
the time between setting up a relay and getting listed as running
in the consensus. It should also improve the time between setting
up a bridge and seeing use by bridge users.
- Directory authorities no longer launch a TLS connection to every
relay as they startup. Now that we have 2k+ descriptors cached,
the resulting network hiccup is becoming a burden. Besides,
authorities already avoid voting about Running for the first half
hour of their uptime.
Changes in version 0.2.2.12-alpha - 2010-04-20
Tor 0.2.2.12-alpha fixes a critical bug in how directory authorities
handle and vote on descriptors. It was causing relays to drop out of
the consensus.
o Major bugfixes:
- Many relays have been falling out of the consensus lately because
not enough authorities know about their descriptor for them to get
a majority of votes. When we deprecated the v2 directory protocol,
we got rid of the only way that v3 authorities can hear from each
other about other descriptors. Now authorities examine every v3
vote for new descriptors, and fetch them from that authority. Bugfix
on 0.2.1.23.
- Fix two typos in tor_vasprintf() that broke the compile on Windows,
and a warning in or.h related to bandwidth_weight_rule_t that
prevented clean compile on OS X. Fixes bug 1363; bugfix on
0.2.2.11-alpha.
- Fix a segfault on relays when DirReqStatistics is enabled
and 24 hours pass. Bug found by keb. Fixes bug 1365; bugfix on
0.2.2.11-alpha.
o Minor bugfixes:
- Demote a confusing TLS warning that relay operators might get when
someone tries to talk to their OrPort. It is neither the operator's
fault nor can they do anything about it. Fixes bug 1364; bugfix
on 0.2.0.14-alpha.
Changes in version 0.2.2.11-alpha - 2010-04-15
Tor 0.2.2.11-alpha fixes yet another instance of broken OpenSSL
libraries that was causing some relays to drop out of the consensus.
o Major bugfixes:
- Directory mirrors were fetching relay descriptors only from v2
directory authorities, rather than v3 authorities like they should.
Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
- Fix a parsing error that made every possible value of
CircPriorityHalflifeMsec get treated as "1 msec". Bugfix
on 0.2.2.7-alpha. Rename CircPriorityHalflifeMsec to
CircuitPriorityHalflifeMsec, so authorities can tell newer relays
about the option without breaking older ones.
- Fix SSL renegotiation behavior on OpenSSL versions like on Centos
that claim to be earlier than 0.9.8m, but which have in reality
backported huge swaths of 0.9.8m or 0.9.8n renegotiation
behavior. Possible fix for some cases of bug 1346.
o Minor features:
- Experiment with a more aggressive approach to preventing clients
from making one-hop exit streams. Exit relays who want to try it
out can set "RefuseUnknownExits 1" in their torrc, and then look
for "Attempt by %s to open a stream" log messages. Let us know
how it goes!
- Add support for statically linking zlib by specifying
--enable-static-zlib, to go with our support for statically linking
openssl and libevent. Resolves bug 1358.
o Minor bugfixes:
- Fix a segfault that happens whenever a Tor client that is using
libevent2's bufferevents gets a hup signal. Bugfix on 0.2.2.5-alpha;
fixes bug 1341.
- When we cleaned up the contrib/tor-exit-notice.html file, we left
out the first line. Fixes bug 1295.
- When building the manpage from a tarball, we required asciidoc, but
the asciidoc -> roff/html conversion was already done for the
tarball. Make 'make' complain only when we need asciidoc (either
because we're compiling directly from git, or because we altered
the asciidoc manpage in the tarball). Bugfix on 0.2.2.9-alpha.
- When none of the directory authorities vote on any params, Tor
segfaulted when trying to make the consensus from the votes. We
didn't trigger the bug in practice, because authorities do include
params in their votes. Bugfix on 0.2.2.10-alpha; fixes bug 1322.
o Testsuite fixes:
- In the util/threads test, no longer free the test_mutex before all
worker threads have finished. Bugfix on 0.2.1.6-alpha.
- The master thread could starve the worker threads quite badly on
certain systems, causing them to run only partially in the allowed
window. This resulted in test failures. Now the master thread sleeps
occasionally for a few microseconds while the two worker-threads
compete for the mutex. Bugfix on 0.2.0.1-alpha.
Changes in version 0.2.2.10-alpha - 2010-03-07
Tor 0.2.2.10-alpha fixes a regression introduced in 0.2.2.9-alpha that
could prevent relays from guessing their IP address correctly. It also
starts the groundwork for another client-side performance boost, since
currently we're not making efficient use of relays that have both the
Guard flag and the Exit flag.
o Major bugfixes:
- Fix a regression from our patch for bug 1244 that caused relays
to guess their IP address incorrectly if they didn't set Address
in their torrc and/or their address fails to resolve. Bugfix on
0.2.2.9-alpha; fixes bug 1269.
o Major features (performance):
- Directory authorities now compute consensus weightings that instruct
clients how to weight relays flagged as Guard, Exit, Guard+Exit,
and no flag. Clients that use these weightings will distribute
network load more evenly across these different relay types. The
weightings are in the consensus so we can change them globally in
the future. Extra thanks to "outofwords" for finding some nasty
security bugs in the first implementation of this feature.
o Minor features (performance):
- Always perform router selections using weighted relay bandwidth,
even if we don't need a high capacity circuit at the time. Non-fast
circuits now only differ from fast ones in that they can use relays
not marked with the Fast flag. This "feature" could turn out to
be a horrible bug; we should investigate more before it goes into
a stable release.
o Minor features:
- Allow disabling building of the manpages. Skipping the manpage
speeds up the build considerably.
o Minor bugfixes (on 0.2.2.x):
- Fix a memleak in the EXTENDCIRCUIT logic. Spotted by coverity.
Bugfix on 0.2.2.9-alpha.
- Disallow values larger than INT32_MAX for PerConnBWRate|Burst
config option. Bugfix on 0.2.2.7-alpha.
- Ship the asciidoc-helper file in the tarball, so that people can
build from source if they want to, and touching the .1.txt files
doesn't break the build. Bugfix on 0.2.2.9-alpha.
o Minor bugfixes (on 0.2.1.x or earlier):
- Fix a dereference-then-NULL-check sequence when publishing
descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
bug 1255.
- Fix another dereference-then-NULL-check sequence. Bugfix on
0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
- Make sure we treat potentially not NUL-terminated strings correctly.
Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
o Code simplifications and refactoring:
- Fix some urls in the exit notice file and make it XHTML1.1 strict
compliant. Based on a patch from Christian Kujau.
- Don't use sed in asciidoc-helper anymore.
- Make the build process fail if asciidoc cannot be found and
building with asciidoc isn't disabled.
Changes in version 0.2.2.9-alpha - 2010-02-22
Tor 0.2.2.9-alpha makes Tor work again on the latest OS X, updates the
location of a directory authority, and cleans up a bunch of small bugs.
o Directory authority changes:
- Change IP address for dannenberg (v3 directory authority), and
remove moria2 (obsolete v1, v2 directory authority and v0 hidden
service directory authority) from the list.
o Major bugfixes:
- Make Tor work again on the latest OS X: when deciding whether to
use strange flags to turn TLS renegotiation on, detect the OpenSSL
version at run-time, not compile time. We need to do this because
Apple doesn't update its dev-tools headers when it updates its
libraries in a security patch.
- Fix a potential buffer overflow in lookup_last_hid_serv_request()
that could happen on 32-bit platforms with 64-bit time_t. Also fix
a memory leak when requesting a hidden service descriptor we've
requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
by aakova.
- Authorities could be tricked into giving out the Exit flag to relays
that didn't allow exiting to any ports. This bug could screw
with load balancing and stats. Bugfix on 0.1.1.6-alpha; fixes bug
1238. Bug discovered by Martin Kowalczyk.
- When freeing a session key, zero it out completely. We only zeroed
the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
patched by ekir. Fixes bug 1254.
o Minor bugfixes:
- Fix static compilation by listing the openssl libraries in the right
order. Bugfix on Tor 0.2.2.8-alpha; fixes bug 1237.
- Resume handling .exit hostnames in a special way: originally we
stripped the .exit part and used the requested exit relay. In
0.2.2.1-alpha we stopped treating them in any special way, meaning
if you use a .exit address then Tor will pass it on to the exit
relay. Now we reject the .exit stream outright, since that behavior
might be more expected by the user. Found and diagnosed by Scott
Bennett and Downie on or-talk.
- Don't spam the controller with events when we have no file
descriptors available. Bugfix on 0.2.1.5-alpha. (Rate-limiting
for log messages was already solved from bug 748.)
- Avoid a bogus overlapped memcpy in tor_addr_copy(). Reported by
"memcpyfail".
- Make the DNSPort option work with libevent 2.x. Don't alter the
behavior for libevent 1.x. Fixes bug 1143. Found by SwissTorExit.
- Emit a GUARD DROPPED controller event for a case we missed.
- Make more fields in the controller protocol case-insensitive, since
control-spec.txt said they were.
- Refactor resolve_my_address() to not use gethostbyname() anymore.
Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
- Fix a spec conformance issue: the network-status-version token
must be the first token in a v3 consensus or vote. Discovered by
parakeep. Bugfix on 0.2.0.3-alpha.
o Code simplifications and refactoring:
- Generate our manpage and HTML documentation using Asciidoc. This
change should make it easier to maintain the documentation, and
produce nicer HTML.
- Remove the --enable-iphone option. According to reports from Marco
Bonetti, Tor builds fine without any special tweaking on recent
iPhone SDK versions.
- Removed some unnecessary files from the source distribution. The
AUTHORS file has now been merged into the people page on the
website. The roadmaps and design doc can now be found in the
projects directory in svn.
- Enabled various circuit build timeout constants to be controlled
by consensus parameters. Also set better defaults for these
parameters based on experimentation on broadband and simulated
high latency links.
o Minor features:
- The 'EXTENDCIRCUIT' control port command can now be used with
a circ id of 0 and no path. This feature will cause Tor to build
a new 'fast' general purpose circuit using its own path selection
algorithms.
- Added a BUILDTIMEOUT_SET controller event to describe changes
to the circuit build timeout.
- Future-proof the controller protocol a bit by ignoring keyword
arguments we do not recognize.
- Expand homedirs passed to tor-checkkey. This should silence a
coverity complaint about passing a user-supplied string into
open() without checking it.
Changes in version 0.2.1.25 - 2010-03-16
Tor 0.2.1.25 fixes a regression introduced in 0.2.1.23 that could
prevent relays from guessing their IP address correctly. It also fixes
several minor potential security bugs.
o Major bugfixes:
- Fix a regression from our patch for bug 1244 that caused relays
to guess their IP address incorrectly if they didn't set Address
in their torrc and/or their address fails to resolve. Bugfix on
0.2.1.23; fixes bug 1269.
- When freeing a session key, zero it out completely. We only zeroed
the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
patched by ekir. Fixes bug 1254.
o Minor bugfixes:
- Fix a dereference-then-NULL-check sequence when publishing
descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
bug 1255.
- Fix another dereference-then-NULL-check sequence. Bugfix on
0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
- Make sure we treat potentially not NUL-terminated strings correctly.
Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
Changes in version 0.2.1.24 - 2010-02-21
Tor 0.2.1.24 makes Tor work again on the latest OS X -- this time
for sure!
o Minor bugfixes:
- Work correctly out-of-the-box with even more vendor-patched versions
of OpenSSL. In particular, make it so Debian and OS X don't need
customized patches to run/build.
Changes in version 0.2.1.23 - 2010-02-13
Tor 0.2.1.23 fixes a huge client-side performance bug, makes Tor work
again on the latest OS X, and updates the location of a directory
authority.
o Major bugfixes (performance):
- We were selecting our guards uniformly at random, and then weighting
which of our guards we'd use uniformly at random. This imbalance
meant that Tor clients were severely limited on throughput (and
probably latency too) by the first hop in their circuit. Now we
select guards weighted by currently advertised bandwidth. We also
automatically discard guards picked using the old algorithm. Fixes
bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
o Major bugfixes:
- Make Tor work again on the latest OS X: when deciding whether to
use strange flags to turn TLS renegotiation on, detect the OpenSSL
version at run-time, not compile time. We need to do this because
Apple doesn't update its dev-tools headers when it updates its
libraries in a security patch.
- Fix a potential buffer overflow in lookup_last_hid_serv_request()
that could happen on 32-bit platforms with 64-bit time_t. Also fix
a memory leak when requesting a hidden service descriptor we've
requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
by aakova.
o Directory authority changes:
- Change IP address for dannenberg (v3 directory authority), and
remove moria2 (obsolete v1, v2 directory authority and v0 hidden
service directory authority) from the list.
o Minor bugfixes:
- Refactor resolve_my_address() to not use gethostbyname() anymore.
Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
o Minor features:
- Avoid a mad rush at the beginning of each month when each client
rotates half of its guards. Instead we spread the rotation out
throughout the month, but we still avoid leaving a precise timestamp
in the state file about when we first picked the guard. Improves
over the behavior introduced in 0.1.2.17.
Changes in version 0.2.2.8-alpha - 2010-01-26
Tor 0.2.2.8-alpha fixes a crash bug in 0.2.2.7-alpha that has been
causing bridge relays to disappear. If you're running a bridge,
please upgrade.
o Major bugfixes:
- Fix a memory corruption bug on bridges that occurred during the
inclusion of stats data in extra-info descriptors. Also fix the
interface for geoip_get_bridge_stats* to prevent similar bugs in
the future. Diagnosis by Tas, patch by Karsten and Sebastian.
Fixes bug 1208; bugfix on 0.2.2.7-alpha.
o Minor bugfixes:
- Ignore OutboundBindAddress when connecting to localhost.
Connections to localhost need to come _from_ localhost, or else
local servers (like DNS and outgoing HTTP/SOCKS proxies) will often
refuse to listen.
Changes in version 0.2.2.7-alpha - 2010-01-19
Tor 0.2.2.7-alpha fixes a huge client-side performance bug, as well
as laying the groundwork for further relay-side performance fixes. It
also starts cleaning up client behavior with respect to the EntryNodes,
ExitNodes, and StrictNodes config options.
This release also rotates two directory authority keys, due to a
security breach of some of the Torproject servers.
o Directory authority changes:
- Rotate keys (both v3 identity and relay identity) for moria1
and gabelmoo.
o Major features (performance):
- We were selecting our guards uniformly at random, and then weighting
which of our guards we'd use uniformly at random. This imbalance
meant that Tor clients were severely limited on throughput (and
probably latency too) by the first hop in their circuit. Now we
select guards weighted by currently advertised bandwidth. We also
automatically discard guards picked using the old algorithm. Fixes
bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
- When choosing which cells to relay first, relays can now favor
circuits that have been quiet recently, to provide lower latency
for low-volume circuits. By default, relays enable or disable this
feature based on a setting in the consensus. You can override
this default by using the new "CircuitPriorityHalflife" config
option. Design and code by Ian Goldberg, Can Tang, and Chris
Alexander.
- Add separate per-conn write limiting to go with the per-conn read
limiting. We added a global write limit in Tor 0.1.2.5-alpha,
but never per-conn write limits.
- New consensus params "bwconnrate" and "bwconnburst" to let us
rate-limit client connections as they enter the network. It's
controlled in the consensus so we can turn it on and off for
experiments. It's starting out off. Based on proposal 163.
o Major features (relay selection options):
- Switch to a StrictNodes config option, rather than the previous
"StrictEntryNodes" / "StrictExitNodes" separation that was missing a
"StrictExcludeNodes" option.
- If EntryNodes, ExitNodes, ExcludeNodes, or ExcludeExitNodes
change during a config reload, mark and discard all our origin
circuits. This fix should address edge cases where we change the
config options and but then choose a circuit that we created before
the change.
- If EntryNodes or ExitNodes are set, be more willing to use an
unsuitable (e.g. slow or unstable) circuit. The user asked for it,
they get it.
- Make EntryNodes config option much more aggressive even when
StrictNodes is not set. Before it would prepend your requested
entrynodes to your list of guard nodes, but feel free to use others
after that. Now it chooses only from your EntryNodes if any of
those are available, and only falls back to others if a) they're
all down and b) StrictNodes is not set.
- Now we refresh your entry guards from EntryNodes at each consensus
fetch -- rather than just at startup and then they slowly rot as
the network changes.
o Major bugfixes:
- Stop bridge directory authorities from answering dbg-stability.txt
directory queries, which would let people fetch a list of all
bridge identities they track. Bugfix on 0.2.1.6-alpha.
o Minor features:
- Log a notice when we get a new control connection. Now it's easier
for security-conscious users to recognize when a local application
is knocking on their controller door. Suggested by bug 1196.
- New config option "CircuitStreamTimeout" to override our internal
timeout schedule for how many seconds until we detach a stream from
a circuit and try a new circuit. If your network is particularly
slow, you might want to set this to a number like 60.
- New controller command "getinfo config-text". It returns the
contents that Tor would write if you send it a SAVECONF command,
so the controller can write the file to disk itself.
- New options for SafeLogging to allow scrubbing only log messages
generated while acting as a relay.
- Ship the bridges spec file in the tarball too.
- Avoid a mad rush at the beginning of each month when each client
rotates half of its guards. Instead we spread the rotation out
throughout the month, but we still avoid leaving a precise timestamp
in the state file about when we first picked the guard. Improves
over the behavior introduced in 0.1.2.17.
o Minor bugfixes (compiling):
- Fix compilation on OS X 10.3, which has a stub mlockall() but
hides it. Bugfix on 0.2.2.6-alpha.
- Fix compilation on Solaris by removing support for the
DisableAllSwap config option. Solaris doesn't have an rlimit for
mlockall, so we cannot use it safely. Fixes bug 1198; bugfix on
0.2.2.6-alpha.
o Minor bugfixes (crashes):
- Do not segfault when writing buffer stats when we haven't observed
a single circuit to report about. Found by Fabian Lanze. Bugfix on
0.2.2.1-alpha.
- If we're in the pathological case where there's no exit bandwidth
but there is non-exit bandwidth, or no guard bandwidth but there
is non-guard bandwidth, don't crash during path selection. Bugfix
on 0.2.0.3-alpha.
- Fix an impossible-to-actually-trigger buffer overflow in relay
descriptor generation. Bugfix on 0.1.0.15.
o Minor bugfixes (privacy):
- Fix an instance where a Tor directory mirror might accidentally
log the IP address of a misbehaving Tor client. Bugfix on
0.1.0.1-rc.
- Don't list Windows capabilities in relay descriptors. We never made
use of them, and maybe it's a bad idea to publish them. Bugfix
on 0.1.1.8-alpha.
o Minor bugfixes (other):
- Resolve an edge case in path weighting that could make us misweight
our relay selection. Fixes bug 1203; bugfix on 0.0.8rc1.
- Fix statistics on client numbers by country as seen by bridges that
were broken in 0.2.2.1-alpha. Also switch to reporting full 24-hour
intervals instead of variable 12-to-48-hour intervals.
- After we free an internal connection structure, overwrite it
with a different memory value than we use for overwriting a freed
internal circuit structure. Should help with debugging. Suggested
by bug 1055.
- Update our OpenSSL 0.9.8l fix so that it works with OpenSSL 0.9.8m
too.
o Removed features:
- Remove the HSAuthorityRecordStats option that version 0 hidden
service authorities could have used to track statistics of overall
hidden service usage.
Changes in version 0.2.1.22 - 2010-01-19
Tor 0.2.1.22 fixes a critical privacy problem in bridge directory
authorities -- it would tell you its whole history of bridge descriptors
if you make the right directory request. This stable update also
rotates two of the seven v3 directory authority keys and locations.
o Directory authority changes:
- Rotate keys (both v3 identity and relay identity) for moria1
and gabelmoo.
o Major bugfixes:
- Stop bridge directory authorities from answering dbg-stability.txt
directory queries, which would let people fetch a list of all
bridge identities they track. Bugfix on 0.2.1.6-alpha.
Changes in version 0.2.1.21 - 2009-12-21
Tor 0.2.1.21 fixes an incompatibility with the most recent OpenSSL
library. If you use Tor on Linux / Unix and you're getting SSL
renegotiation errors, upgrading should help. We also recommend an
upgrade if you're an exit relay.
o Major bugfixes:
- Work around a security feature in OpenSSL 0.9.8l that prevents our
handshake from working unless we explicitly tell OpenSSL that we
are using SSL renegotiation safely. We are, of course, but OpenSSL
0.9.8l won't work unless we say we are.
- Avoid crashing if the client is trying to upload many bytes and the
circuit gets torn down at the same time, or if the flip side
happens on the exit relay. Bugfix on 0.2.0.1-alpha; fixes bug 1150.
o Minor bugfixes:
- Do not refuse to learn about authority certs and v2 networkstatus
documents that are older than the latest consensus. This bug might
have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
Spotted and fixed by xmux.
- Fix a couple of very-hard-to-trigger memory leaks, and one hard-to-
trigger platform-specific option misparsing case found by Coverity
Scan.
- Fix a compilation warning on Fedora 12 by removing an impossible-to-
trigger assert. Fixes bug 1173.
Changes in version 0.2.2.6-alpha - 2009-11-19
Tor 0.2.2.6-alpha lays the groundwork for many upcoming features:
support for the new lower-footprint "microdescriptor" directory design,
future-proofing our consensus format against new hash functions or
other changes, and an Android port. It also makes Tor compatible with
the upcoming OpenSSL 0.9.8l release, and fixes a variety of bugs.
o Major features:
- Directory authorities can now create, vote on, and serve multiple
parallel formats of directory data as part of their voting process.
Partially implements Proposal 162: "Publish the consensus in
multiple flavors".
- Directory authorities can now agree on and publish small summaries
of router information that clients can use in place of regular
server descriptors. This transition will eventually allow clients
to use far less bandwidth for downloading information about the
network. Begins the implementation of Proposal 158: "Clients
download consensus + microdescriptors".
- The directory voting system is now extensible to use multiple hash
algorithms for signatures and resource selection. Newer formats
are signed with SHA256, with a possibility for moving to a better
hash algorithm in the future.
- New DisableAllSwap option. If set to 1, Tor will attempt to lock all
current and future memory pages via mlockall(). On supported
platforms (modern Linux and probably BSD but not Windows or OS X),
this should effectively disable any and all attempts to page out
memory. This option requires that you start your Tor as root --
if you use DisableAllSwap, please consider using the User option
to properly reduce the privileges of your Tor.
- Numerous changes, bugfixes, and workarounds from Nathan Freitas
to help Tor build correctly for Android phones.
o Major bugfixes:
- Work around a security feature in OpenSSL 0.9.8l that prevents our
handshake from working unless we explicitly tell OpenSSL that we
are using SSL renegotiation safely. We are, but OpenSSL 0.9.8l
won't work unless we say we are.
o Minor bugfixes:
- Fix a crash bug when trying to initialize the evdns module in
Libevent 2. Bugfix on 0.2.1.16-rc.
- Stop logging at severity 'warn' when some other Tor client tries
to establish a circuit with us using weak DH keys. It's a protocol
violation, but that doesn't mean ordinary users need to hear about
it. Fixes the bug part of bug 1114. Bugfix on 0.1.0.13.
- Do not refuse to learn about authority certs and v2 networkstatus
documents that are older than the latest consensus. This bug might
have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
Spotted and fixed by xmux.
- Fix numerous small code-flaws found by Coverity Scan Rung 3.
- If all authorities restart at once right before a consensus vote,
nobody will vote about "Running", and clients will get a consensus
with no usable relays. Instead, authorities refuse to build a
consensus if this happens. Bugfix on 0.2.0.10-alpha; fixes bug 1066.
- If your relay can't keep up with the number of incoming create
cells, it would log one warning per failure into your logs. Limit
warnings to 1 per minute. Bugfix on 0.0.2pre10; fixes bug 1042.
- Bridges now use "reject *:*" as their default exit policy. Bugfix
on 0.2.0.3-alpha; fixes bug 1113.
- Fix a memory leak on directory authorities during voting that was
introduced in 0.2.2.1-alpha. Found via valgrind.
Changes in version 0.2.1.20 - 2009-10-15
Tor 0.2.1.20 fixes a crash bug when you're accessing many hidden
services at once, prepares for more performance improvements, and
fixes a bunch of smaller bugs.
The Windows and OS X bundles also include a more recent Vidalia,
and switch from Privoxy to Polipo.
The OS X installers are now drag and drop. It's best to un-install
Tor/Vidalia and then install this new bundle, rather than upgrade. If
you want to upgrade, you'll need to update the paths for Tor and Polipo
in the Vidalia Settings window.
o Major bugfixes:
- Send circuit or stream sendme cells when our window has decreased
by 100 cells, not when it has decreased by 101 cells. Bug uncovered
by Karsten when testing the "reduce circuit window" performance
patch. Bugfix on the 54th commit on Tor -- from July 2002,
before the release of Tor 0.0.0. This is the new winner of the
oldest-bug prize.
- Fix a remotely triggerable memory leak when a consensus document
contains more than one signature from the same voter. Bugfix on
0.2.0.3-alpha.
- Avoid segfault in rare cases when finishing an introduction circuit
as a client and finding out that we don't have an introduction key
for it. Fixes bug 1073. Reported by Aaron Swartz.
o Major features:
- Tor now reads the "circwindow" parameter out of the consensus,
and uses that value for its circuit package window rather than the
default of 1000 cells. Begins the implementation of proposal 168.
o New directory authorities:
- Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
authority.
- Move moria1 and tonga to alternate IP addresses.
o Minor bugfixes:
- Fix a signed/unsigned compile warning in 0.2.1.19.
- Fix possible segmentation fault on directory authorities. Bugfix on
0.2.1.14-rc.
- Fix an extremely rare infinite recursion bug that could occur if
we tried to log a message after shutting down the log subsystem.
Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
- Fix an obscure bug where hidden services on 64-bit big-endian
systems might mis-read the timestamp in v3 introduce cells, and
refuse to connect back to the client. Discovered by "rotor".
Bugfix on 0.2.1.6-alpha.
- We were triggering a CLOCK_SKEW controller status event whenever
we connect via the v2 connection protocol to any relay that has
a wrong clock. Instead, we should only inform the controller when
it's a trusted authority that claims our clock is wrong. Bugfix
on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
- We were telling the controller about CHECKING_REACHABILITY and
REACHABILITY_FAILED status events whenever we launch a testing
circuit or notice that one has failed. Instead, only tell the
controller when we want to inform the user of overall success or
overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
by SwissTorExit.
- Don't warn when we're using a circuit that ends with a node
excluded in ExcludeExitNodes, but the circuit is not used to access
the outside world. This should help fix bug 1090. Bugfix on
0.2.1.6-alpha.
- Work around a small memory leak in some versions of OpenSSL that
stopped the memory used by the hostname TLS extension from being
freed.
o Minor features:
- Add a "getinfo status/accepted-server-descriptor" controller
command, which is the recommended way for controllers to learn
whether our server descriptor has been successfully received by at
least on directory authority. Un-recommend good-server-descriptor
getinfo and status events until we have a better design for them.
Changes in version 0.2.2.5-alpha - 2009-10-11
Tor 0.2.2.5-alpha fixes a few compile problems in 0.2.2.4-alpha.
o Major bugfixes:
- Make the tarball compile again. Oops. Bugfix on 0.2.2.4-alpha.
o Directory authorities:
- Temporarily (just for this release) move dizum to an alternate
IP address.
Changes in version 0.2.2.4-alpha - 2009-10-10
Tor 0.2.2.4-alpha fixes more crash bugs in 0.2.2.2-alpha. It also
introduces a new unit test framework, shifts directry authority
addresses around to reduce the impact from recent blocking events,
and fixes a few smaller bugs.
o Major bugfixes:
- Fix several more asserts in the circuit_build_times code, for
example one that causes Tor to fail to start once we have
accumulated 5000 build times in the state file. Bugfixes on
0.2.2.2-alpha; fixes bug 1108.
o New directory authorities:
- Move moria1 and Tonga to alternate IP addresses.
o Minor features:
- Log SSL state transitions at debug level during handshake, and
include SSL states in error messages. This may help debug future
SSL handshake issues.
- Add a new "Handshake" log domain for activities that happen
during the TLS handshake.
- Revert to the "June 3 2009" ip-to-country file. The September one
seems to have removed most US IP addresses.
- Directory authorities now reject Tor relays with versions less than
0.1.2.14. This step cuts out four relays from the current network,
none of which are very big.
o Minor bugfixes:
- Fix a couple of smaller issues with gathering statistics. Bugfixes
on 0.2.2.1-alpha.
- Fix two memory leaks in the error case of
circuit_build_times_parse_state(). Bugfix on 0.2.2.2-alpha.
- Don't count one-hop circuits when we're estimating how long it
takes circuits to build on average. Otherwise we'll set our circuit
build timeout lower than we should. Bugfix on 0.2.2.2-alpha.
- Directory authorities no longer change their opinion of, or vote on,
whether a router is Running, unless they have themselves been
online long enough to have some idea. Bugfix on 0.2.0.6-alpha.
Fixes bug 1023.
o Code simplifications and refactoring:
- Revise our unit tests to use the "tinytest" framework, so we
can run tests in their own processes, have smarter setup/teardown
code, and so on. The unit test code has moved to its own
subdirectory, and has been split into multiple modules.
Changes in version 0.2.2.3-alpha - 2009-09-23
Tor 0.2.2.3-alpha fixes a few crash bugs in 0.2.2.2-alpha.
o Major bugfixes:
- Fix an overzealous assert in our new circuit build timeout code.
Bugfix on 0.2.2.2-alpha; fixes bug 1103.
o Minor bugfixes:
- If the networkstatus consensus tells us that we should use a
negative circuit package window, ignore it. Otherwise we'll
believe it and then trigger an assert. Bugfix on 0.2.2.2-alpha.
Changes in version 0.2.2.2-alpha - 2009-09-21
Tor 0.2.2.2-alpha introduces our latest performance improvement for
clients: Tor tracks the average time it takes to build a circuit, and
avoids using circuits that take too long to build. For fast connections,
this feature can cut your expected latency in half. For slow or flaky
connections, it could ruin your Tor experience. Let us know if it does!
o Major features:
- Tor now tracks how long it takes to build client-side circuits
over time, and adapts its timeout to local network performance.
Since a circuit that takes a long time to build will also provide
bad performance, we get significant latency improvements by
discarding the slowest 20% of circuits. Specifically, Tor creates
circuits more aggressively than usual until it has enough data
points for a good timeout estimate. Implements proposal 151.
We are especially looking for reports (good and bad) from users with
both EDGE and broadband connections that can move from broadband
to EDGE and find out if the build-time data in the .tor/state gets
reset without loss of Tor usability. You should also see a notice
log message telling you that Tor has reset its timeout.
- Directory authorities can now vote on arbitrary integer values as
part of the consensus process. This is designed to help set
network-wide parameters. Implements proposal 167.
- Tor now reads the "circwindow" parameter out of the consensus,
and uses that value for its circuit package window rather than the
default of 1000 cells. Begins the implementation of proposal 168.
o Major bugfixes:
- Fix a remotely triggerable memory leak when a consensus document
contains more than one signature from the same voter. Bugfix on
0.2.0.3-alpha.
o Minor bugfixes:
- Fix an extremely rare infinite recursion bug that could occur if
we tried to log a message after shutting down the log subsystem.
Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
- Fix parsing for memory or time units given without a space between
the number and the unit. Bugfix on 0.2.2.1-alpha; fixes bug 1076.
- A networkstatus vote must contain exactly one signature. Spec
conformance issue. Bugfix on 0.2.0.3-alpha.
- Fix an obscure bug where hidden services on 64-bit big-endian
systems might mis-read the timestamp in v3 introduce cells, and
refuse to connect back to the client. Discovered by "rotor".
Bugfix on 0.2.1.6-alpha.
- We were triggering a CLOCK_SKEW controller status event whenever
we connect via the v2 connection protocol to any relay that has
a wrong clock. Instead, we should only inform the controller when
it's a trusted authority that claims our clock is wrong. Bugfix
on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
- We were telling the controller about CHECKING_REACHABILITY and
REACHABILITY_FAILED status events whenever we launch a testing
circuit or notice that one has failed. Instead, only tell the
controller when we want to inform the user of overall success or
overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
by SwissTorExit.
- Don't warn when we're using a circuit that ends with a node
excluded in ExcludeExitNodes, but the circuit is not used to access
the outside world. This should help fix bug 1090, but more problems
remain. Bugfix on 0.2.1.6-alpha.
- Work around a small memory leak in some versions of OpenSSL that
stopped the memory used by the hostname TLS extension from being
freed.
- Make our 'torify' script more portable; if we have only one of
'torsocks' or 'tsocks' installed, don't complain to the user;
and explain our warning about tsocks better.
o Minor features:
- Add a "getinfo status/accepted-server-descriptor" controller
command, which is the recommended way for controllers to learn
whether our server descriptor has been successfully received by at
least on directory authority. Un-recommend good-server-descriptor
getinfo and status events until we have a better design for them.
- Update to the "September 4 2009" ip-to-country file.
Changes in version 0.2.2.1-alpha - 2009-08-26
Tor 0.2.2.1-alpha disables ".exit" address notation by default, allows
Tor clients to bootstrap on networks where only port 80 is reachable,
makes it more straightforward to support hardware crypto accelerators,
and starts the groundwork for gathering stats safely at relays.
o Security fixes:
- Start the process of disabling ".exit" address notation, since it
can be used for a variety of esoteric application-level attacks
on users. To reenable it, set "AllowDotExit 1" in your torrc. Fix
on 0.0.9rc5.
o New directory authorities:
- Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
authority.
o Major features:
- New AccelName and AccelDir options add support for dynamic OpenSSL
hardware crypto acceleration engines.
- Tor now supports tunneling all of its outgoing connections over
a SOCKS proxy, using the SOCKS4Proxy and/or SOCKS5Proxy
configuration options. Code by Christopher Davis.
o Major bugfixes:
- Send circuit or stream sendme cells when our window has decreased
by 100 cells, not when it has decreased by 101 cells. Bug uncovered
by Karsten when testing the "reduce circuit window" performance
patch. Bugfix on the 54th commit on Tor -- from July 2002,
before the release of Tor 0.0.0. This is the new winner of the
oldest-bug prize.
o New options for gathering stats safely:
- Directory mirrors that set "DirReqStatistics 1" write statistics
about directory requests to disk every 24 hours. As compared to the
--enable-geoip-stats flag in 0.2.1.x, there are a few improvements:
1) stats are written to disk exactly every 24 hours; 2) estimated
shares of v2 and v3 requests are determined as mean values, not at
the end of a measurement period; 3) unresolved requests are listed
with country code '??'; 4) directories also measure download times.
- Exit nodes that set "ExitPortStatistics 1" write statistics on the
number of exit streams and transferred bytes per port to disk every
24 hours.
- Relays that set "CellStatistics 1" write statistics on how long
cells spend in their circuit queues to disk every 24 hours.
- Entry nodes that set "EntryStatistics 1" write statistics on the
rough number and origins of connecting clients to disk every 24
hours.
- Relays that write any of the above statistics to disk and set
"ExtraInfoStatistics 1" include the past 24 hours of statistics in
their extra-info documents.
o Minor features:
- New --digests command-line switch to output the digests of the
source files Tor was built with.
- The "torify" script now uses torsocks where available.
- The memarea code now uses a sentinel value at the end of each area
to make sure nothing writes beyond the end of an area. This might
help debug some conceivable causes of bug 930.
- Time and memory units in the configuration file can now be set to
fractional units. For example, "2.5 GB" is now a valid value for
AccountingMax.
- Certain Tor clients (such as those behind check.torproject.org) may
want to fetch the consensus in an extra early manner. To enable this
a user may now set FetchDirInfoExtraEarly to 1. This also depends on
setting FetchDirInfoEarly to 1. Previous behavior will stay the same
as only certain clients who must have this information sooner should
set this option.
- Instead of adding the svn revision to the Tor version string, report
the git commit (when we're building from a git checkout).
o Minor bugfixes:
- If any of the v3 certs we download are unparseable, we should
actually notice the failure so we don't retry indefinitely. Bugfix
on 0.2.0.x; reported by "rotator".
- If the cached cert file is unparseable, warn but don't exit.
- Fix possible segmentation fault on directory authorities. Bugfix on
0.2.1.14-rc.
- When Tor fails to parse a descriptor of any kind, dump it to disk.
Might help diagnosing bug 1051.
o Deprecated and removed features:
- The controller no longer accepts the old obsolete "addr-mappings/"
or "unregistered-servers-" GETINFO values.
- Hidden services no longer publish version 0 descriptors, and clients
do not request or use version 0 descriptors. However, the old hidden
service authorities still accept and serve version 0 descriptors
when contacted by older hidden services/clients.
- The EXTENDED_EVENTS and VERBOSE_NAMES controller features are now
always on; using them is necessary for correct forward-compatible
controllers.
- Remove support for .noconnect style addresses. Nobody was using
them, and they provided another avenue for detecting Tor users
via application-level web tricks.
o Packaging changes:
- Upgrade Vidalia from 0.1.15 to 0.2.3 in the Windows and OS X
installer bundles. See
https://trac.vidalia-project.net/browser/vidalia/tags/vidalia-0.2.3/CHANGELOG
for details of what's new in Vidalia 0.2.3.
- Windows Vidalia Bundle: update Privoxy from 3.0.6 to 3.0.14-beta.
- OS X Vidalia Bundle: move to Polipo 1.0.4 with Tor specific
configuration file, rather than the old Privoxy.
- OS X Vidalia Bundle: Vidalia, Tor, and Polipo are compiled as
x86-only for better compatibility with OS X 10.6, aka Snow Leopard.
- OS X Tor Expert Bundle: Tor is compiled as x86-only for
better compatibility with OS X 10.6, aka Snow Leopard.
- OS X Vidalia Bundle: The multi-package installer is now replaced
by a simple drag and drop to the /Applications folder. This change
occurred with the upgrade to Vidalia 0.2.3.
Changes in version 0.2.1.19 - 2009-07-28
Tor 0.2.1.19 fixes a major bug with accessing and providing hidden
services on Tor 0.2.1.3-alpha through 0.2.1.18.
o Major bugfixes:
- Make accessing hidden services on 0.2.1.x work right again.
Bugfix on 0.2.1.3-alpha; workaround for bug 1038. Diagnosis and
part of patch provided by "optimist".
o Minor features:
- When a relay/bridge is writing out its identity key fingerprint to
the "fingerprint" file and to its logs, write it without spaces. Now
it will look like the fingerprints in our bridges documentation,
and confuse fewer users.
o Minor bugfixes:
- Relays no longer publish a new server descriptor if they change
their MaxAdvertisedBandwidth config option but it doesn't end up
changing their advertised bandwidth numbers. Bugfix on 0.2.0.28-rc;
fixes bug 1026. Patch from Sebastian.
- Avoid leaking memory every time we get a create cell but we have
so many already queued that we refuse it. Bugfix on 0.2.0.19-alpha;
fixes bug 1034. Reported by BarkerJr.
Changes in version 0.2.1.18 - 2009-07-24
Tor 0.2.1.18 lays the foundations for performance improvements,
adds status events to help users diagnose bootstrap problems, adds
optional authentication/authorization for hidden services, fixes a
variety of potential anonymity problems, and includes a huge pile of
other features and bug fixes.
o Build fixes:
- Add LIBS=-lrt to Makefile.am so the Tor RPMs use a static libevent.
Changes in version 0.2.1.17-rc - 2009-07-07
Tor 0.2.1.17-rc marks the fourth -- and hopefully last -- release
candidate for the 0.2.1.x series. It lays the groundwork for further
client performance improvements, and also fixes a big bug with directory
authorities that were causing them to assign Guard and Stable flags
poorly.
The Windows bundles also finally include the geoip database that we
thought we'd been shipping since 0.2.0.x (oops), and the OS X bundles
should actually install Torbutton rather than giving you a cryptic
failure message (oops).
o Major features:
- Clients now use the bandwidth values in the consensus, rather than
the bandwidth values in each relay descriptor. This approach opens
the door to more accurate bandwidth estimates once the directory
authorities start doing active measurements. Implements more of
proposal 141.
o Major bugfixes:
- When Tor clients restart after 1-5 days, they discard all their
cached descriptors as too old, but they still use the cached
consensus document. This approach is good for robustness, but
bad for performance: since they don't know any bandwidths, they
end up choosing at random rather than weighting their choice by
speed. Fixed by the above feature of putting bandwidths in the
consensus. Bugfix on 0.2.0.x.
- Directory authorities were neglecting to mark relays down in their
internal histories if the relays fall off the routerlist without
ever being found unreachable. So there were relays in the histories
that haven't been seen for eight months, and are listed as being
up for eight months. This wreaked havoc on the "median wfu"
and "median mtbf" calculations, in turn making Guard and Stable
flags very wrong, hurting network performance. Fixes bugs 696 and
969. Bugfix on 0.2.0.6-alpha.
o Minor bugfixes:
- Serve the DirPortFrontPage page even when we have been approaching
our quotas recently. Fixes bug 1013; bugfix on 0.2.1.8-alpha.
- The control port would close the connection before flushing long
replies, such as the network consensus, if a QUIT command was issued
before the reply had completed. Now, the control port flushes all
pending replies before closing the connection. Also fixed a spurious
warning when a QUIT command is issued after a malformed or rejected
AUTHENTICATE command, but before the connection was closed. Patch
by Marcus Griep. Bugfix on 0.2.0.x; fixes bugs 1015 and 1016.
- When we can't find an intro key for a v2 hidden service descriptor,
fall back to the v0 hidden service descriptor and log a bug message.
Workaround for bug 1024.
- Fix a log message that did not respect the SafeLogging option.
Resolves bug 1027.
o Minor features:
- If we're a relay and we change our IP address, be more verbose
about the reason that made us change. Should help track down
further bugs for relays on dynamic IP addresses.
Changes in version 0.2.0.35 - 2009-06-24
o Security fix:
- Avoid crashing in the presence of certain malformed descriptors.
Found by lark, and by automated fuzzing.
- Fix an edge case where a malicious exit relay could convince a
controller that the client's DNS question resolves to an internal IP
address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
o Major bugfixes:
- Finally fix the bug where dynamic-IP relays disappear when their
IP address changes: directory mirrors were mistakenly telling
them their old address if they asked via begin_dir, so they
never got an accurate answer about their new address, so they
just vanished after a day. For belt-and-suspenders, relays that
don't set Address in their config now avoid using begin_dir for
all direct connections. Should fix bugs 827, 883, and 900.
- Fix a timing-dependent, allocator-dependent, DNS-related crash bug
that would occur on some exit nodes when DNS failures and timeouts
occurred in certain patterns. Fix for bug 957.
o Minor bugfixes:
- When starting with a cache over a few days old, do not leak
memory for the obsolete router descriptors in it. Bugfix on
0.2.0.33; fixes bug 672.
- Hidden service clients didn't use a cached service descriptor that
was older than 15 minutes, but wouldn't fetch a new one either,
because there was already one in the cache. Now, fetch a v2
descriptor unless the same descriptor was added to the cache within
the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
Changes in version 0.2.1.16-rc - 2009-06-20
Tor 0.2.1.16-rc speeds up performance for fast exit relays, and fixes
a bunch of minor bugs.
o Security fixes:
- Fix an edge case where a malicious exit relay could convince a
controller that the client's DNS question resolves to an internal IP
address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
o Major performance improvements (on 0.2.0.x):
- Disable and refactor some debugging checks that forced a linear scan
over the whole server-side DNS cache. These accounted for over 50%
of CPU time on a relatively busy exit node's gprof profile. Found
by Jacob.
- Disable some debugging checks that appeared in exit node profile
data.
o Minor features:
- Update to the "June 3 2009" ip-to-country file.
- Do not have tor-resolve automatically refuse all .onion addresses;
if AutomapHostsOnResolve is set in your torrc, this will work fine.
o Minor bugfixes (on 0.2.0.x):
- Log correct error messages for DNS-related network errors on
Windows.
- Fix a race condition that could cause crashes or memory corruption
when running as a server with a controller listening for log
messages.
- Avoid crashing when we have a policy specified in a DirPolicy or
SocksPolicy or ReachableAddresses option with ports set on it,
and we re-load the policy. May fix bug 996.
- Hidden service clients didn't use a cached service descriptor that
was older than 15 minutes, but wouldn't fetch a new one either,
because there was already one in the cache. Now, fetch a v2
descriptor unless the same descriptor was added to the cache within
the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
o Minor bugfixes (on 0.2.1.x):
- Don't warn users about low port and hibernation mix when they
provide a *ListenAddress directive to fix that. Bugfix on
0.2.1.15-rc.
- When switching back and forth between bridge mode, do not start
gathering GeoIP data until two hours have passed.
- Do not complain that the user has requested an excluded node as
an exit when the node is not really an exit. This could happen
because the circuit was for testing, or an introduction point.
Fix for bug 984.
Changes in version 0.2.1.15-rc - 2009-05-25
Tor 0.2.1.15-rc marks the second release candidate for the 0.2.1.x
series. It fixes a major bug on fast exit relays, as well as a variety
of more minor bugs.
o Major bugfixes (on 0.2.0.x):
- Fix a timing-dependent, allocator-dependent, DNS-related crash bug
that would occur on some exit nodes when DNS failures and timeouts
occurred in certain patterns. Fix for bug 957.
o Minor bugfixes (on 0.2.0.x):
- Actually return -1 in the error case for read_bandwidth_usage().
Harmless bug, since we currently don't care about the return value
anywhere. Bugfix on 0.2.0.9-alpha.
- Provide a more useful log message if bug 977 (related to buffer
freelists) ever reappears, and do not crash right away.
- Fix an assertion failure on 64-bit platforms when we allocated
memory right up to the end of a memarea, then realigned the memory
one step beyond the end. Fixes a possible cause of bug 930.
- Protect the count of open sockets with a mutex, so we can't
corrupt it when two threads are closing or opening sockets at once.
Fix for bug 939. Bugfix on 0.2.0.1-alpha.
- Don't allow a bridge to publish its router descriptor to a
non-bridge directory authority. Fixes part of bug 932.
- When we change to or from being a bridge, reset our counts of
client usage by country. Fixes bug 932.
- Fix a bug that made stream bandwidth get misreported to the
controller.
- Stop using malloc_usable_size() to use more area than we had
actually allocated: it was safe, but made valgrind really unhappy.
- Fix a memory leak when v3 directory authorities load their keys
and cert from disk. Bugfix on 0.2.0.1-alpha.
o Minor bugfixes (on 0.2.1.x):
- Fix use of freed memory when deciding to mark a non-addable
descriptor as never-downloadable. Bugfix on 0.2.1.9-alpha.
Changes in version 0.2.1.14-rc - 2009-04-12
Tor 0.2.1.14-rc marks the first release candidate for the 0.2.1.x
series. It begins fixing some major performance problems, and also
finally addresses the bug that was causing relays on dynamic IP
addresses to fall out of the directory.
o Major features:
- Clients replace entry guards that were chosen more than a few months
ago. This change should significantly improve client performance,
especially once more people upgrade, since relays that have been
a guard for a long time are currently overloaded.
o Major bugfixes (on 0.2.0):
- Finally fix the bug where dynamic-IP relays disappear when their
IP address changes: directory mirrors were mistakenly telling
them their old address if they asked via begin_dir, so they
never got an accurate answer about their new address, so they
just vanished after a day. For belt-and-suspenders, relays that
don't set Address in their config now avoid using begin_dir for
all direct connections. Should fix bugs 827, 883, and 900.
- Relays were falling out of the networkstatus consensus for
part of a day if they changed their local config but the
authorities discarded their new descriptor as "not sufficiently
different". Now directory authorities accept a descriptor as changed
if bandwidthrate or bandwidthburst changed. Partial fix for bug 962;
patch by Sebastian.
- Avoid crashing in the presence of certain malformed descriptors.
Found by lark, and by automated fuzzing.
o Minor features:
- When generating circuit events with verbose nicknames for
controllers, try harder to look up nicknames for routers on a
circuit. (Previously, we would look in the router descriptors we had
for nicknames, but not in the consensus.) Partial fix for bug 941.
- If the bridge config line doesn't specify a port, assume 443.
This makes bridge lines a bit smaller and easier for users to
understand.
- Raise the minimum bandwidth to be a relay from 20000 bytes to 20480
bytes (aka 20KB/s), to match our documentation. Also update
directory authorities so they always assign the Fast flag to relays
with 20KB/s of capacity. Now people running relays won't suddenly
find themselves not seeing any use, if the network gets faster
on average.
- Update to the "April 3 2009" ip-to-country file.
o Minor bugfixes:
- Avoid trying to print raw memory to the logs when we decide to
give up on downloading a given relay descriptor. Bugfix on
0.2.1.9-alpha.
- In tor-resolve, when the Tor client to use is specified by
<hostname>:<port>, actually use the specified port rather than
defaulting to 9050. Bugfix on 0.2.1.6-alpha.
- Make directory usage recording work again. Bugfix on 0.2.1.6-alpha.
- When starting with a cache over a few days old, do not leak
memory for the obsolete router descriptors in it. Bugfix on
0.2.0.33.
- Avoid double-free on list of successfully uploaded hidden
service discriptors. Fix for bug 948. Bugfix on 0.2.1.6-alpha.
- Change memarea_strndup() implementation to work even when
duplicating a string at the end of a page. This bug was
harmless for now, but could have meant crashes later. Fix by
lark. Bugfix on 0.2.1.1-alpha.
- Limit uploaded directory documents to be 16M rather than 500K.
The directory authorities were refusing v3 consensus votes from
other authorities, since the votes are now 504K. Fixes bug 959;
bugfix on 0.0.2pre17 (where we raised it from 50K to 500K ;).
- Directory authorities should never send a 503 "busy" response to
requests for votes or keys. Bugfix on 0.2.0.8-alpha; exposed by
bug 959.
Changes in version 0.2.1.13-alpha - 2009-03-09
Tor 0.2.1.13-alpha includes another big pile of minor bugfixes and
cleanups. We're finally getting close to a release candidate.
o Major bugfixes:
- Correctly update the list of which countries we exclude as
exits, when the GeoIP file is loaded or reloaded. Diagnosed by
lark. Bugfix on 0.2.1.6-alpha.
o Minor bugfixes (on 0.2.0.x and earlier):
- Automatically detect MacOSX versions earlier than 10.4.0, and
disable kqueue from inside Tor when running with these versions.
We previously did this from the startup script, but that was no
help to people who didn't use the startup script. Resolves bug 863.
- When we had picked an exit node for a connection, but marked it as
"optional", and it turned out we had no onion key for the exit,
stop wanting that exit and try again. This situation may not
be possible now, but will probably become feasible with proposal
158. Spotted by rovv. Fixes another case of bug 752.
- Clients no longer cache certificates for authorities they do not
recognize. Bugfix on 0.2.0.9-alpha.
- When we can't transmit a DNS request due to a network error, retry
it after a while, and eventually transmit a failing response to
the RESOLVED cell. Bugfix on 0.1.2.5-alpha.
- If the controller claimed responsibility for a stream, but that
stream never finished making its connection, it would live
forever in circuit_wait state. Now we close it after SocksTimeout
seconds. Bugfix on 0.1.2.7-alpha; reported by Mike Perry.
- Drop begin cells to a hidden service if they come from the middle
of a circuit. Patch from lark.
- When we erroneously receive two EXTEND cells for the same circuit
ID on the same connection, drop the second. Patch from lark.
- Fix a crash that occurs on exit nodes when a nameserver request
timed out. Bugfix on 0.1.2.1-alpha; our CLEAR debugging code had
been suppressing the bug since 0.1.2.10-alpha. Partial fix for
bug 929.
- Do not assume that a stack-allocated character array will be
64-bit aligned on platforms that demand that uint64_t access is
aligned. Possible fix for bug 604.
- Parse dates and IPv4 addresses in a locale- and libc-independent
manner, to avoid platform-dependent behavior on malformed input.
- Build correctly when configured to build outside the main source
path. Patch from Michael Gold.
- We were already rejecting relay begin cells with destination port
of 0. Now also reject extend cells with destination port or address
of 0. Suggested by lark.
o Minor bugfixes (on 0.2.1.x):
- Don't re-extend introduction circuits if we ran out of RELAY_EARLY
cells. Bugfix on 0.2.1.3-alpha. Fixes more of bug 878.
- If we're an exit node, scrub the IP address to which we are exiting
in the logs. Bugfix on 0.2.1.8-alpha.
o Minor features:
- On Linux, use the prctl call to re-enable core dumps when the user
is option is set.
- New controller event NEWCONSENSUS that lists the networkstatus
lines for every recommended relay. Now controllers like Torflow
can keep up-to-date on which relays they should be using.
- Update to the "February 26 2009" ip-to-country file.
Changes in version 0.2.0.34 - 2009-02-08
Tor 0.2.0.34 features several more security-related fixes. You should
upgrade, especially if you run an exit relay (remote crash) or a
directory authority (remote infinite loop), or you're on an older
(pre-XP) or not-recently-patched Windows (remote exploit).
This release marks end-of-life for Tor 0.1.2.x. Those Tor versions
have many known flaws, and nobody should be using them. You should
upgrade. If you're using a Linux or BSD and its packages are obsolete,
stop using those packages and upgrade anyway.
o Security fixes:
- Fix an infinite-loop bug on handling corrupt votes under certain
circumstances. Bugfix on 0.2.0.8-alpha.
- Fix a temporary DoS vulnerability that could be performed by
a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
- Avoid a potential crash on exit nodes when processing malformed
input. Remote DoS opportunity. Bugfix on 0.2.0.33.
- Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
Spec conformance issue. Bugfix on Tor 0.0.2pre27.
o Minor bugfixes:
- Fix compilation on systems where time_t is a 64-bit integer.
Patch from Matthias Drochner.
- Don't consider expiring already-closed client connections. Fixes
bug 893. Bugfix on 0.0.2pre20.
Changes in version 0.2.1.12-alpha - 2009-02-08
Tor 0.2.1.12-alpha features several more security-related fixes. You
should upgrade, especially if you run an exit relay (remote crash) or
a directory authority (remote infinite loop), or you're on an older
(pre-XP) or not-recently-patched Windows (remote exploit). It also
includes a big pile of minor bugfixes and cleanups.
o Security fixes:
- Fix an infinite-loop bug on handling corrupt votes under certain
circumstances. Bugfix on 0.2.0.8-alpha.
- Fix a temporary DoS vulnerability that could be performed by
a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
- Avoid a potential crash on exit nodes when processing malformed
input. Remote DoS opportunity. Bugfix on 0.2.1.7-alpha.
o Minor bugfixes:
- Let controllers actually ask for the "clients_seen" event for
getting usage summaries on bridge relays. Bugfix on 0.2.1.10-alpha;
reported by Matt Edman.
- Fix a compile warning on OSX Panther. Fixes bug 913; bugfix against
0.2.1.11-alpha.
- Fix a bug in address parsing that was preventing bridges or hidden
service targets from being at IPv6 addresses.
- Solve a bug that kept hardware crypto acceleration from getting
enabled when accounting was turned on. Fixes bug 907. Bugfix on
0.0.9pre6.
- Remove a bash-ism from configure.in to build properly on non-Linux
platforms. Bugfix on 0.2.1.1-alpha.
- Fix code so authorities _actually_ send back X-Descriptor-Not-New
headers. Bugfix on 0.2.0.10-alpha.
- Don't consider expiring already-closed client connections. Fixes
bug 893. Bugfix on 0.0.2pre20.
- Fix another interesting corner-case of bug 891 spotted by rovv:
Previously, if two hosts had different amounts of clock drift, and
one of them created a new connection with just the wrong timing,
the other might decide to deprecate the new connection erroneously.
Bugfix on 0.1.1.13-alpha.
- Resolve a very rare crash bug that could occur when the user forced
a nameserver reconfiguration during the middle of a nameserver
probe. Fixes bug 526. Bugfix on 0.1.2.1-alpha.
- Support changing value of ServerDNSRandomizeCase during SIGHUP.
Bugfix on 0.2.1.7-alpha.
- If we're using bridges and our network goes away, be more willing
to forgive our bridges and try again when we get an application
request. Bugfix on 0.2.0.x.
o Minor features:
- Support platforms where time_t is 64 bits long. (Congratulations,
NetBSD!) Patch from Matthias Drochner.
- Add a 'getinfo status/clients-seen' controller command, in case
controllers want to hear clients_seen events but connect late.
o Build changes:
- Disable GCC's strict alias optimization by default, to avoid the
likelihood of its introducing subtle bugs whenever our code violates
the letter of C99's alias rules.
Changes in version 0.2.0.33 - 2009-01-21
Tor 0.2.0.33 fixes a variety of bugs that were making relays less
useful to users. It also finally fixes a bug where a relay or client
that's been off for many days would take a long time to bootstrap.
This update also fixes an important security-related bug reported by
Ilja van Sprundel. You should upgrade. (We'll send out more details
about the bug once people have had some time to upgrade.)
o Security fixes:
- Fix a heap-corruption bug that may be remotely triggerable on
some platforms. Reported by Ilja van Sprundel.
o Major bugfixes:
- When a stream at an exit relay is in state "resolving" or
"connecting" and it receives an "end" relay cell, the exit relay
would silently ignore the end cell and not close the stream. If
the client never closes the circuit, then the exit relay never
closes the TCP connection. Bug introduced in Tor 0.1.2.1-alpha;
reported by "wood".
- When sending CREATED cells back for a given circuit, use a 64-bit
connection ID to find the right connection, rather than an addr:port
combination. Now that we can have multiple OR connections between
the same ORs, it is no longer possible to use addr:port to uniquely
identify a connection.
- Bridge relays that had DirPort set to 0 would stop fetching
descriptors shortly after startup, and then briefly resume
after a new bandwidth test and/or after publishing a new bridge
descriptor. Bridge users that try to bootstrap from them would
get a recent networkstatus but would get descriptors from up to
18 hours earlier, meaning most of the descriptors were obsolete
already. Reported by Tas; bugfix on 0.2.0.13-alpha.
- Prevent bridge relays from serving their 'extrainfo' document
to anybody who asks, now that extrainfo docs include potentially
sensitive aggregated client geoip summaries. Bugfix on
0.2.0.13-alpha.
- If the cached networkstatus consensus is more than five days old,
discard it rather than trying to use it. In theory it could be
useful because it lists alternate directory mirrors, but in practice
it just means we spend many minutes trying directory mirrors that
are long gone from the network. Also discard router descriptors as
we load them if they are more than five days old, since the onion
key is probably wrong by now. Bugfix on 0.2.0.x. Fixes bug 887.
o Minor bugfixes:
- Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
could make gcc generate non-functional binary search code. Bugfix
on 0.2.0.10-alpha.
- Build correctly on platforms without socklen_t.
- Compile without warnings on solaris.
- Avoid potential crash on internal error during signature collection.
Fixes bug 864. Patch from rovv.
- Correct handling of possible malformed authority signing key
certificates with internal signature types. Fixes bug 880.
Bugfix on 0.2.0.3-alpha.
- Fix a hard-to-trigger resource leak when logging credential status.
CID 349.
- When we can't initialize DNS because the network is down, do not
automatically stop Tor from starting. Instead, we retry failed
dns_init() every 10 minutes, and change the exit policy to reject
*:* until one succeeds. Fixes bug 691.
- Use 64 bits instead of 32 bits for connection identifiers used with
the controller protocol, to greatly reduce risk of identifier reuse.
- When we're choosing an exit node for a circuit, and we have
no pending streams, choose a good general exit rather than one that
supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
- Fix another case of assuming, when a specific exit is requested,
that we know more than the user about what hosts it allows.
Fixes one case of bug 752. Patch from rovv.
- Clip the MaxCircuitDirtiness config option to a minimum of 10
seconds. Warn the user if lower values are given in the
configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
- Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
user if lower values are given in the configuration. Bugfix on
0.1.1.17-rc. Patch by Sebastian.
- Fix a memory leak when we decline to add a v2 rendezvous descriptor to
the cache because we already had a v0 descriptor with the same ID.
Bugfix on 0.2.0.18-alpha.
- Fix a race condition when freeing keys shared between main thread
and CPU workers that could result in a memory leak. Bugfix on
0.1.0.1-rc. Fixes bug 889.
- Send a valid END cell back when a client tries to connect to a
nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
840. Patch from rovv.
- Check which hops rendezvous stream cells are associated with to
prevent possible guess-the-streamid injection attacks from
intermediate hops. Fixes another case of bug 446. Based on patch
from rovv.
- If a broken client asks a non-exit router to connect somewhere,
do not even do the DNS lookup before rejecting the connection.
Fixes another case of bug 619. Patch from rovv.
- When a relay gets a create cell it can't decrypt (e.g. because it's
using the wrong onion key), we were dropping it and letting the
client time out. Now actually answer with a destroy cell. Fixes
bug 904. Bugfix on 0.0.2pre8.
o Minor bugfixes (hidden services):
- Do not throw away existing introduction points on SIGHUP. Bugfix on
0.0.6pre1. Patch by Karsten. Fixes bug 874.
o Minor features:
- Report the case where all signatures in a detached set are rejected
differently than the case where there is an error handling the
detached set.
- When we realize that another process has modified our cached
descriptors, print out a more useful error message rather than
triggering an assertion. Fixes bug 885. Patch from Karsten.
- Implement the 0x20 hack to better resist DNS poisoning: set the
case on outgoing DNS requests randomly, and reject responses that do
not match the case correctly. This logic can be disabled with the
ServerDNSRandomizeCase setting, if you are using one of the 0.3%
of servers that do not reliably preserve case in replies. See
"Increased DNS Forgery Resistance through 0x20-Bit Encoding"
for more info.
- Check DNS replies for more matching fields to better resist DNS
poisoning.
- Never use OpenSSL compression: it wastes RAM and CPU trying to
compress cells, which are basically all encrypted, compressed, or
both.
Changes in version 0.2.1.11-alpha - 2009-01-20
Tor 0.2.1.11-alpha finishes fixing the "if your Tor is off for a
week it will take a long time to bootstrap again" bug. It also fixes
an important security-related bug reported by Ilja van Sprundel. You
should upgrade. (We'll send out more details about the bug once people
have had some time to upgrade.)
o Security fixes:
- Fix a heap-corruption bug that may be remotely triggerable on
some platforms. Reported by Ilja van Sprundel.
o Major bugfixes:
- Discard router descriptors as we load them if they are more than
five days old. Otherwise if Tor is off for a long time and then
starts with cached descriptors, it will try to use the onion
keys in those obsolete descriptors when building circuits. Bugfix
on 0.2.0.x. Fixes bug 887.
o Minor features:
- Try to make sure that the version of Libevent we're running with
is binary-compatible with the one we built with. May address bug
897 and others.
- Make setting ServerDNSRandomizeCase to 0 actually work. Bugfix
for bug 905. Bugfix on 0.2.1.7-alpha.
- Add a new --enable-local-appdata configuration switch to change
the default location of the datadir on win32 from APPDATA to
LOCAL_APPDATA. In the future, we should migrate to LOCAL_APPDATA
entirely. Patch from coderman.
o Minor bugfixes:
- Make outbound DNS packets respect the OutboundBindAddress setting.
Fixes the bug part of bug 798. Bugfix on 0.1.2.2-alpha.
- When our circuit fails at the first hop (e.g. we get a destroy
cell back), avoid using that OR connection anymore, and also
tell all the one-hop directory requests waiting for it that they
should fail. Bugfix on 0.2.1.3-alpha.
- In the torify(1) manpage, mention that tsocks will leak your
DNS requests.
Changes in version 0.2.1.10-alpha - 2009-01-06
Tor 0.2.1.10-alpha fixes two major bugs in bridge relays (one that
would make the bridge relay not so useful if it had DirPort set to 0,
and one that could let an attacker learn a little bit of information
about the bridge's users), and a bug that would cause your Tor relay
to ignore a circuit create request it can't decrypt (rather than reply
with an error). It also fixes a wide variety of other bugs.
o Major bugfixes:
- If the cached networkstatus consensus is more than five days old,
discard it rather than trying to use it. In theory it could
be useful because it lists alternate directory mirrors, but in
practice it just means we spend many minutes trying directory
mirrors that are long gone from the network. Helps bug 887 a bit;
bugfix on 0.2.0.x.
- Bridge relays that had DirPort set to 0 would stop fetching
descriptors shortly after startup, and then briefly resume
after a new bandwidth test and/or after publishing a new bridge
descriptor. Bridge users that try to bootstrap from them would
get a recent networkstatus but would get descriptors from up to
18 hours earlier, meaning most of the descriptors were obsolete
already. Reported by Tas; bugfix on 0.2.0.13-alpha.
- Prevent bridge relays from serving their 'extrainfo' document
to anybody who asks, now that extrainfo docs include potentially
sensitive aggregated client geoip summaries. Bugfix on
0.2.0.13-alpha.
o Minor features:
- New controller event "clients_seen" to report a geoip-based summary
of which countries we've seen clients from recently. Now controllers
like Vidalia can show bridge operators that they're actually making
a difference.
- Build correctly against versions of OpenSSL 0.9.8 or later built
without support for deprecated functions.
- Update to the "December 19 2008" ip-to-country file.
o Minor bugfixes (on 0.2.0.x):
- Authorities now vote for the Stable flag for any router whose
weighted MTBF is at least 5 days, regardless of the mean MTBF.
- Do not remove routers as too old if we do not have any consensus
document. Bugfix on 0.2.0.7-alpha.
- Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
Spec conformance issue. Bugfix on Tor 0.0.2pre27.
- When an exit relay resolves a stream address to a local IP address,
do not just keep retrying that same exit relay over and
over. Instead, just close the stream. Addresses bug 872. Bugfix
on 0.2.0.32. Patch from rovv.
- If a hidden service sends us an END cell, do not consider
retrying the connection; just close it. Patch from rovv.
- When we made bridge authorities stop serving bridge descriptors over
unencrypted links, we also broke DirPort reachability testing for
bridges. So bridges with a non-zero DirPort were printing spurious
warns to their logs. Bugfix on 0.2.0.16-alpha. Fixes bug 709.
- When a relay gets a create cell it can't decrypt (e.g. because it's
using the wrong onion key), we were dropping it and letting the
client time out. Now actually answer with a destroy cell. Fixes
bug 904. Bugfix on 0.0.2pre8.
- Squeeze 2-5% out of client performance (according to oprofile) by
improving the implementation of some policy-manipulation functions.
o Minor bugfixes (on 0.2.1.x):
- Make get_interface_address() function work properly again; stop
guessing the wrong parts of our address as our address.
- Do not cannibalize a circuit if we're out of RELAY_EARLY cells to
send on that circuit. Otherwise we might violate the proposal-110
limit. Bugfix on 0.2.1.3-alpha. Partial fix for bug 878. Diagnosis
thanks to Karsten.
- When we're sending non-EXTEND cells to the first hop in a circuit,
for example to use an encrypted directory connection, we don't need
to use RELAY_EARLY cells: the first hop knows what kind of cell
it is, and nobody else can even see the cell type. Conserving
RELAY_EARLY cells makes it easier to cannibalize circuits like
this later.
- Stop logging nameserver addresses in reverse order.
- If we are retrying a directory download slowly over and over, do
not automatically give up after the 254th failure. Bugfix on
0.2.1.9-alpha.
- Resume reporting accurate "stream end" reasons to the local control
port. They were lost in the changes for Proposal 148. Bugfix on
0.2.1.9-alpha.
o Deprecated and removed features:
- The old "tor --version --version" command, which would print out
the subversion "Id" of most of the source files, is now removed. It
turned out to be less useful than we'd expected, and harder to
maintain.
o Code simplifications and refactoring:
- Change our header file guard macros to be less likely to conflict
with system headers. Adam Langley noticed that we were conflicting
with log.h on Android.
- Tool-assisted documentation cleanup. Nearly every function or
static variable in Tor should have its own documentation now.
Changes in version 0.2.1.9-alpha - 2008-12-25
Tor 0.2.1.9-alpha fixes many more bugs, some of them security-related.
o New directory authorities:
- gabelmoo (the authority run by Karsten Loesing) now has a new
IP address.
o Security fixes:
- Never use a connection with a mismatched address to extend a
circuit, unless that connection is canonical. A canonical
connection is one whose address is authenticated by the router's
identity key, either in a NETINFO cell or in a router descriptor.
- Avoid a possible memory corruption bug when receiving hidden service
descriptors. Bugfix on 0.2.1.6-alpha.
o Major bugfixes:
- Fix a logic error that would automatically reject all but the first
configured DNS server. Bugfix on 0.2.1.5-alpha. Possible fix for
part of bug 813/868. Bug spotted by coderman.
- When a stream at an exit relay is in state "resolving" or
"connecting" and it receives an "end" relay cell, the exit relay
would silently ignore the end cell and not close the stream. If
the client never closes the circuit, then the exit relay never
closes the TCP connection. Bug introduced in 0.1.2.1-alpha;
reported by "wood".
- When we can't initialize DNS because the network is down, do not
automatically stop Tor from starting. Instead, retry failed
dns_init() every 10 minutes, and change the exit policy to reject
*:* until one succeeds. Fixes bug 691.
o Minor features:
- Give a better error message when an overzealous init script says
"sudo -u username tor --user username". Makes Bug 882 easier for
users to diagnose.
- When a directory authority gives us a new guess for our IP address,
log which authority we used. Hopefully this will help us debug
the recent complaints about bad IP address guesses.
- Detect svn revision properly when we're using git-svn.
- Try not to open more than one descriptor-downloading connection
to an authority at once. This should reduce load on directory
authorities. Fixes bug 366.
- Add cross-certification to newly generated certificates, so that
a signing key is enough information to look up a certificate.
Partial implementation of proposal 157.
- Start serving certificates by <identity digest, signing key digest>
pairs. Partial implementation of proposal 157.
- Clients now never report any stream end reason except 'MISC'.
Implements proposal 148.
- On platforms with a maximum syslog string length, truncate syslog
messages to that length ourselves, rather than relying on the
system to do it for us.
- Optimize out calls to time(NULL) that occur for every IO operation,
or for every cell. On systems where time() is a slow syscall,
this fix will be slightly helpful.
- Exit servers can now answer resolve requests for ip6.arpa addresses.
- When we download a descriptor that we then immediately (as
a directory authority) reject, do not retry downloading it right
away. Should save some bandwidth on authorities. Fix for bug
888. Patch by Sebastian Hahn.
- When a download gets us zero good descriptors, do not notify
Tor that new directory information has arrived.
- Avoid some nasty corner cases in the logic for marking connections
as too old or obsolete or noncanonical for circuits. Partial
bugfix on bug 891.
o Minor features (controller):
- New CONSENSUS_ARRIVED event to note when a new consensus has
been fetched and validated.
- When we realize that another process has modified our cached
descriptors file, print out a more useful error message rather
than triggering an assertion. Fixes bug 885. Patch from Karsten.
- Add an internal-use-only __ReloadTorrcOnSIGHUP option for
controllers to prevent SIGHUP from reloading the
configuration. Fixes bug 856.
o Minor bugfixes:
- Resume using the correct "REASON=" stream when telling the
controller why we closed a stream. Bugfix in 0.2.1.1-alpha.
- When a canonical connection appears later in our internal list
than a noncanonical one for a given OR ID, always use the
canonical one. Bugfix on 0.2.0.12-alpha. Fixes bug 805.
Spotted by rovv.
- Clip the MaxCircuitDirtiness config option to a minimum of 10
seconds. Warn the user if lower values are given in the
configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
- Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
user if lower values are given in the configuration. Bugfix on
0.1.1.17-rc. Patch by Sebastian.
- Fix a race condition when freeing keys shared between main thread
and CPU workers that could result in a memory leak. Bugfix on
0.1.0.1-rc. Fixes bug 889.
o Minor bugfixes (hidden services):
- Do not throw away existing introduction points on SIGHUP (bugfix on
0.0.6pre1); also, do not stall hidden services because we're
throwing away introduction points; bugfix on 0.2.1.7-alpha. Spotted
by John Brooks. Patch by Karsten. Fixes bug 874.
- Fix a memory leak when we decline to add a v2 rendezvous
descriptor to the cache because we already had a v0 descriptor
with the same ID. Bugfix on 0.2.0.18-alpha.
o Deprecated and removed features:
- RedirectExits has been removed. It was deprecated since
0.2.0.3-alpha.
- Finally remove deprecated "EXTENDED_FORMAT" controller feature. It
has been called EXTENDED_EVENTS since 0.1.2.4-alpha.
- Cell pools are now always enabled; --disable-cell-pools is ignored.
o Code simplifications and refactoring:
- Rename the confusing or_is_obsolete field to the more appropriate
is_bad_for_new_circs, and move it to or_connection_t where it
belongs.
- Move edge-only flags from connection_t to edge_connection_t: not
only is this better coding, but on machines of plausible alignment,
it should save 4-8 bytes per connection_t. "Every little bit helps."
- Rename ServerDNSAllowBrokenResolvConf to ServerDNSAllowBrokenConfig
for consistency; keep old option working for backward compatibility.
- Simplify the code for finding connections to use for a circuit.
Changes in version 0.2.1.8-alpha - 2008-12-08
Tor 0.2.1.8-alpha fixes some crash bugs in earlier alpha releases,
builds better on unusual platforms like Solaris and old OS X, and
fixes a variety of other issues.
o Major features:
- New DirPortFrontPage option that takes an html file and publishes
it as "/" on the DirPort. Now relay operators can provide a
disclaimer without needing to set up a separate webserver. There's
a sample disclaimer in contrib/tor-exit-notice.html.
o Security fixes:
- When the client is choosing entry guards, now it selects at most
one guard from a given relay family. Otherwise we could end up with
all of our entry points into the network run by the same operator.
Suggested by Camilo Viecco. Fix on 0.1.1.11-alpha.
o Major bugfixes:
- Fix a DOS opportunity during the voting signature collection process
at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
- Fix a possible segfault when establishing an exit connection. Bugfix
on 0.2.1.5-alpha.
o Minor bugfixes:
- Get file locking working on win32. Bugfix on 0.2.1.6-alpha. Fixes
bug 859.
- Made Tor a little less aggressive about deleting expired
certificates. Partial fix for bug 854.
- Stop doing unaligned memory access that generated bus errors on
sparc64. Bugfix on 0.2.0.10-alpha. Fix for bug 862.
- Fix a crash bug when changing EntryNodes from the controller. Bugfix
on 0.2.1.6-alpha. Fix for bug 867. Patched by Sebastian.
- Make USR2 log-level switch take effect immediately. Bugfix on
0.1.2.8-beta.
- If one win32 nameserver fails to get added, continue adding the
rest, and don't automatically fail.
- Use fcntl() for locking when flock() is not available. Should fix
compilation on Solaris. Should fix Bug 873. Bugfix on 0.2.1.6-alpha.
- Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
could make gcc generate non-functional binary search code. Bugfix
on 0.2.0.10-alpha.
- Build correctly on platforms without socklen_t.
- Avoid potential crash on internal error during signature collection.
Fixes bug 864. Patch from rovv.
- Do not use C's stdio library for writing to log files. This will
improve logging performance by a minute amount, and will stop
leaking fds when our disk is full. Fixes bug 861.
- Stop erroneous use of O_APPEND in cases where we did not in fact
want to re-seek to the end of a file before every last write().
- Correct handling of possible malformed authority signing key
certificates with internal signature types. Fixes bug 880. Bugfix
on 0.2.0.3-alpha.
- Fix a hard-to-trigger resource leak when logging credential status.
CID 349.
o Minor features:
- Directory mirrors no longer fetch the v1 directory or
running-routers files. They are obsolete, and nobody asks for them
anymore. This is the first step to making v1 authorities obsolete.
o Minor features (controller):
- Return circuit purposes in response to GETINFO circuit-status. Fixes
bug 858.
Changes in version 0.2.0.32 - 2008-11-20
Tor 0.2.0.32 fixes a major security problem in Debian and Ubuntu
packages (and maybe other packages) noticed by Theo de Raadt, fixes
a smaller security flaw that might allow an attacker to access local
services, further improves hidden service performance, and fixes a
variety of other issues.
o Security fixes:
- The "User" and "Group" config options did not clear the
supplementary group entries for the Tor process. The "User" option
is now more robust, and we now set the groups to the specified
user's primary group. The "Group" option is now ignored. For more
detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848 and 857.
- The "ClientDNSRejectInternalAddresses" config option wasn't being
consistently obeyed: if an exit relay refuses a stream because its
exit policy doesn't allow it, we would remember what IP address
the relay said the destination address resolves to, even if it's
an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
o Major bugfixes:
- Fix a DOS opportunity during the voting signature collection process
at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
o Major bugfixes (hidden services):
- When fetching v0 and v2 rendezvous service descriptors in parallel,
we were failing the whole hidden service request when the v0
descriptor fetch fails, even if the v2 fetch is still pending and
might succeed. Similarly, if the last v2 fetch fails, we were
failing the whole hidden service request even if a v0 fetch is
still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
- When extending a circuit to a hidden service directory to upload a
rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
requests failed, because the router descriptor has not been
downloaded yet. In these cases, do not attempt to upload the
rendezvous descriptor, but wait until the router descriptor is
downloaded and retry. Likewise, do not attempt to fetch a rendezvous
descriptor from a hidden service directory for which the router
descriptor has not yet been downloaded. Fixes bug 767. Bugfix
on 0.2.0.10-alpha.
o Minor bugfixes:
- Fix several infrequent memory leaks spotted by Coverity.
- When testing for libevent functions, set the LDFLAGS variable
correctly. Found by Riastradh.
- Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
bootstrapping with tunneled directory connections. Bugfix on
0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
- When asked to connect to A.B.exit:80, if we don't know the IP for A
and we know that server B rejects most-but-not all connections to
port 80, we would previously reject the connection. Now, we assume
the user knows what they were asking for. Fixes bug 752. Bugfix
on 0.0.9rc5. Diagnosed by BarkerJr.
- If we overrun our per-second write limits a little, count this as
having used up our write allocation for the second, and choke
outgoing directory writes. Previously, we had only counted this when
we had met our limits precisely. Fixes bug 824. Patch from by rovv.
Bugfix on 0.2.0.x (??).
- Remove the old v2 directory authority 'lefkada' from the default
list. It has been gone for many months.
- Stop doing unaligned memory access that generated bus errors on
sparc64. Bugfix on 0.2.0.10-alpha. Fixes bug 862.
- Make USR2 log-level switch take effect immediately. Bugfix on
0.1.2.8-beta.
o Minor bugfixes (controller):
- Make DNS resolved events into "CLOSED", not "FAILED". Bugfix on
0.1.2.5-alpha. Fix by Robert Hogan. Resolves bug 807.
Changes in version 0.2.1.7-alpha - 2008-11-08
Tor 0.2.1.7-alpha fixes a major security problem in Debian and Ubuntu
packages (and maybe other packages) noticed by Theo de Raadt, fixes
a smaller security flaw that might allow an attacker to access local
services, adds better defense against DNS poisoning attacks on exit
relays, further improves hidden service performance, and fixes a
variety of other issues.
o Security fixes:
- The "ClientDNSRejectInternalAddresses" config option wasn't being
consistently obeyed: if an exit relay refuses a stream because its
exit policy doesn't allow it, we would remember what IP address
the relay said the destination address resolves to, even if it's
an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
- The "User" and "Group" config options did not clear the
supplementary group entries for the Tor process. The "User" option
is now more robust, and we now set the groups to the specified
user's primary group. The "Group" option is now ignored. For more
detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848.
- Do not use or believe expired v3 authority certificates. Patch
from Karsten. Bugfix in 0.2.0.x. Fixes bug 851.
o Minor features:
- Now NodeFamily and MyFamily config options allow spaces in
identity fingerprints, so it's easier to paste them in.
Suggested by Lucky Green.
- Implement the 0x20 hack to better resist DNS poisoning: set the
case on outgoing DNS requests randomly, and reject responses that do
not match the case correctly. This logic can be disabled with the
ServerDNSRandomizeCase setting, if you are using one of the 0.3%
of servers that do not reliably preserve case in replies. See
"Increased DNS Forgery Resistance through 0x20-Bit Encoding"
for more info.
- Preserve case in replies to DNSPort requests in order to support
the 0x20 hack for resisting DNS poisoning attacks.
o Hidden service performance improvements:
- When the client launches an introduction circuit, retry with a
new circuit after 30 seconds rather than 60 seconds.
- Launch a second client-side introduction circuit in parallel
after a delay of 15 seconds (based on work by Christian Wilms).
- Hidden services start out building five intro circuits rather
than three, and when the first three finish they publish a service
descriptor using those. Now we publish our service descriptor much
faster after restart.
o Minor bugfixes:
- Minor fix in the warning messages when you're having problems
bootstrapping; also, be more forgiving of bootstrap problems when
we're still making incremental progress on a given bootstrap phase.
- When we're choosing an exit node for a circuit, and we have
no pending streams, choose a good general exit rather than one that
supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
- Send a valid END cell back when a client tries to connect to a
nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
840. Patch from rovv.
- If a broken client asks a non-exit router to connect somewhere,
do not even do the DNS lookup before rejecting the connection.
Fixes another case of bug 619. Patch from rovv.
- Fix another case of assuming, when a specific exit is requested,
that we know more than the user about what hosts it allows.
Fixes another case of bug 752. Patch from rovv.
- Check which hops rendezvous stream cells are associated with to
prevent possible guess-the-streamid injection attacks from
intermediate hops. Fixes another case of bug 446. Based on patch
from rovv.
- Avoid using a negative right-shift when comparing 32-bit
addresses. Possible fix for bug 845 and bug 811.
- Make the assert_circuit_ok() function work correctly on circuits that
have already been marked for close.
- Fix read-off-the-end-of-string error in unit tests when decoding
introduction points.
- Fix uninitialized size field for memory area allocation: may improve
memory performance during directory parsing.
- Treat duplicate certificate fetches as failures, so that we do
not try to re-fetch an expired certificate over and over and over.
- Do not say we're fetching a certificate when we'll in fact skip it
because of a pending download.
Changes in version 0.2.1.6-alpha - 2008-09-30
Tor 0.2.1.6-alpha further improves performance and robustness of
hidden services, starts work on supporting per-country relay selection,
and fixes a variety of smaller issues.
o Major features:
- Implement proposal 121: make it possible to build hidden services
that only certain clients are allowed to connect to. This is
enforced at several points, so that unauthorized clients are unable
to send INTRODUCE cells to the service, or even (depending on the
type of authentication) to learn introduction points. This feature
raises the bar for certain kinds of active attacks against hidden
services. Code by Karsten Loesing.
- Relays now store and serve v2 hidden service descriptors by default,
i.e., the new default value for HidServDirectoryV2 is 1. This is
the last step in proposal 114, which aims to make hidden service
lookups more reliable.
- Start work to allow node restrictions to include country codes. The
syntax to exclude nodes in a country with country code XX is
"ExcludeNodes {XX}". Patch from Robert Hogan. It still needs some
refinement to decide what config options should take priority if
you ask to both use a particular node and exclude it.
- Allow ExitNodes list to include IP ranges and country codes, just
like the Exclude*Nodes lists. Patch from Robert Hogan.
o Major bugfixes:
- Fix a bug when parsing ports in tor_addr_port_parse() that caused
Tor to fail to start if you had it configured to use a bridge
relay. Fixes bug 809. Bugfix on 0.2.1.5-alpha.
- When extending a circuit to a hidden service directory to upload a
rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
requests failed, because the router descriptor had not been
downloaded yet. In these cases, we now wait until the router
descriptor is downloaded, and then retry. Likewise, clients
now skip over a hidden service directory if they don't yet have
its router descriptor, rather than futilely requesting it and
putting mysterious complaints in the logs. Fixes bug 767. Bugfix
on 0.2.0.10-alpha.
- When fetching v0 and v2 rendezvous service descriptors in parallel,
we were failing the whole hidden service request when the v0
descriptor fetch fails, even if the v2 fetch is still pending and
might succeed. Similarly, if the last v2 fetch fails, we were
failing the whole hidden service request even if a v0 fetch is
still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
- DNS replies need to have names matching their requests, but
these names should be in the questions section, not necessarily
in the answers section. Fixes bug 823. Bugfix on 0.2.1.5-alpha.
o Minor features:
- Update to the "September 1 2008" ip-to-country file.
- Allow ports 465 and 587 in the default exit policy again. We had
rejected them in 0.1.0.15, because back in 2005 they were commonly
misconfigured and ended up as spam targets. We hear they are better
locked down these days.
- Use a lockfile to make sure that two Tor processes are not
simultaneously running with the same datadir.
- Serve the latest v3 networkstatus consensus via the control
port. Use "getinfo dir/status-vote/current/consensus" to fetch it.
- Better logging about stability/reliability calculations on directory
servers.
- Drop the requirement to have an open dir port for storing and
serving v2 hidden service descriptors.
- Directory authorities now serve a /tor/dbg-stability.txt URL to
help debug WFU and MTBF calculations.
- Implement most of Proposal 152: allow specialized servers to permit
single-hop circuits, and clients to use those servers to build
single-hop circuits when using a specialized controller. Patch
from Josh Albrecht. Resolves feature request 768.
- Add a -p option to tor-resolve for specifying the SOCKS port: some
people find host:port too confusing.
- Make TrackHostExit mappings expire a while after their last use, not
after their creation. Patch from Robert Hogan.
- Provide circuit purposes along with circuit events to the controller.
o Minor bugfixes:
- Fix compile on OpenBSD 4.4-current. Bugfix on 0.2.1.5-alpha.
Reported by Tas.
- Fixed some memory leaks -- some quite frequent, some almost
impossible to trigger -- based on results from Coverity.
- When testing for libevent functions, set the LDFLAGS variable
correctly. Found by Riastradh.
- Fix an assertion bug in parsing policy-related options; possible fix
for bug 811.
- Catch and report a few more bootstrapping failure cases when Tor
fails to establish a TCP connection. Cleanup on 0.2.1.x.
- Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
bootstrapping with tunneled directory connections. Bugfix on
0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
- When asked to connect to A.B.exit:80, if we don't know the IP for A
and we know that server B rejects most-but-not all connections to
port 80, we would previously reject the connection. Now, we assume
the user knows what they were asking for. Fixes bug 752. Bugfix
on 0.0.9rc5. Diagnosed by BarkerJr.
- If we are not using BEGIN_DIR cells, don't attempt to contact hidden
service directories if they have no advertised dir port. Bugfix
on 0.2.0.10-alpha.
- If we overrun our per-second write limits a little, count this as
having used up our write allocation for the second, and choke
outgoing directory writes. Previously, we had only counted this when
we had met our limits precisely. Fixes bug 824. Patch by rovv.
Bugfix on 0.2.0.x (??).
- Avoid a "0 divided by 0" calculation when calculating router uptime
at directory authorities. Bugfix on 0.2.0.8-alpha.
- Make DNS resolved controller events into "CLOSED", not
"FAILED". Bugfix on 0.1.2.5-alpha. Fix by Robert Hogan. Resolves
bug 807.
- Fix a bug where an unreachable relay would establish enough
reachability testing circuits to do a bandwidth test -- if
we already have a connection to the middle hop of the testing
circuit, then it could establish the last hop by using the existing
connection. Bugfix on 0.1.2.2-alpha, exposed when we made testing
circuits no longer use entry guards in 0.2.1.3-alpha.
- If we have correct permissions on $datadir, we complain to stdout
and fail to start. But dangerous permissions on
$datadir/cached-status/ would cause us to open a log and complain
there. Now complain to stdout and fail to start in both cases. Fixes
bug 820, reported by seeess.
- Remove the old v2 directory authority 'lefkada' from the default
list. It has been gone for many months.
o Code simplifications and refactoring:
- Revise the connection_new functions so that a more typesafe variant
exists. This will work better with Coverity, and let us find any
actual mistakes we're making here.
- Refactor unit testing logic so that dmalloc can be used sensibly
with unit tests to check for memory leaks.
- Move all hidden-service related fields from connection and circuit
structure to substructures: this way they won't eat so much memory.
Changes in version 0.2.0.31 - 2008-09-03
Tor 0.2.0.31 addresses two potential anonymity issues, starts to fix
a big bug we're seeing where in rare cases traffic from one Tor stream
gets mixed into another stream, and fixes a variety of smaller issues.
o Major bugfixes:
- Make sure that two circuits can never exist on the same connection
with the same circuit ID, even if one is marked for close. This
is conceivably a bugfix for bug 779. Bugfix on 0.1.0.4-rc.
- Relays now reject risky extend cells: if the extend cell includes
a digest of all zeroes, or asks to extend back to the relay that
sent the extend cell, tear down the circuit. Ideas suggested
by rovv.
- If not enough of our entry guards are available so we add a new
one, we might use the new one even if it overlapped with the
current circuit's exit relay (or its family). Anonymity bugfix
pointed out by rovv.
o Minor bugfixes:
- Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
- Correctly detect the presence of the linux/netfilter_ipv4.h header
when building against recent kernels. Bugfix on 0.1.2.1-alpha.
- Pick size of default geoip filename string correctly on windows.
Fixes bug 806. Bugfix on 0.2.0.30.
- Make the autoconf script accept the obsolete --with-ssl-dir
option as an alias for the actually-working --with-openssl-dir
option. Fix the help documentation to recommend --with-openssl-dir.
Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
- When using the TransPort option on OpenBSD, and using the User
option to change UID and drop privileges, make sure to open
/dev/pf before dropping privileges. Fixes bug 782. Patch from
Christopher Davis. Bugfix on 0.1.2.1-alpha.
- Try to attach connections immediately upon receiving a RENDEZVOUS2
or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
on the client side when connecting to a hidden service. Bugfix
on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
- When closing an application-side connection because its circuit is
getting torn down, generate the stream event correctly. Bugfix on
0.1.2.x. Anonymous patch.
Changes in version 0.2.1.5-alpha - 2008-08-31
Tor 0.2.1.5-alpha moves us closer to handling IPv6 destinations, puts
in a lot of the infrastructure for adding authorization to hidden
services, lays the groundwork for having clients read their load
balancing information out of the networkstatus consensus rather than
the individual router descriptors, addresses two potential anonymity
issues, and fixes a variety of smaller issues.
o Major features:
- Convert many internal address representations to optionally hold
IPv6 addresses.
- Generate and accept IPv6 addresses in many protocol elements.
- Make resolver code handle nameservers located at ipv6 addresses.
- Begin implementation of proposal 121 ("Client authorization for
hidden services"): configure hidden services with client
authorization, publish descriptors for them, and configure
authorization data for hidden services at clients. The next
step is to actually access hidden services that perform client
authorization.
- More progress toward proposal 141: Network status consensus
documents and votes now contain bandwidth information for each
router and a summary of that router's exit policy. Eventually this
will be used by clients so that they do not have to download every
known descriptor before building circuits.
o Major bugfixes (on 0.2.0.x and before):
- When sending CREATED cells back for a given circuit, use a 64-bit
connection ID to find the right connection, rather than an addr:port
combination. Now that we can have multiple OR connections between
the same ORs, it is no longer possible to use addr:port to uniquely
identify a connection.
- Relays now reject risky extend cells: if the extend cell includes
a digest of all zeroes, or asks to extend back to the relay that
sent the extend cell, tear down the circuit. Ideas suggested
by rovv.
- If not enough of our entry guards are available so we add a new
one, we might use the new one even if it overlapped with the
current circuit's exit relay (or its family). Anonymity bugfix
pointed out by rovv.
o Minor bugfixes:
- Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
- When using the TransPort option on OpenBSD, and using the User
option to change UID and drop privileges, make sure to open /dev/pf
before dropping privileges. Fixes bug 782. Patch from Christopher
Davis. Bugfix on 0.1.2.1-alpha.
- Correctly detect the presence of the linux/netfilter_ipv4.h header
when building against recent kernels. Bugfix on 0.1.2.1-alpha.
- Add a missing safe_str() call for a debug log message.
- Use 64 bits instead of 32 bits for connection identifiers used with
the controller protocol, to greatly reduce risk of identifier reuse.
- Make the autoconf script accept the obsolete --with-ssl-dir
option as an alias for the actually-working --with-openssl-dir
option. Fix the help documentation to recommend --with-openssl-dir.
Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
o Minor features:
- Rate-limit too-many-sockets messages: when they happen, they happen
a lot. Resolves bug 748.
- Resist DNS poisoning a little better by making sure that names in
answer sections match.
- Print the SOCKS5 error message string as well as the error code
when a tor-resolve request fails. Patch from Jacob.
Changes in version 0.2.1.4-alpha - 2008-08-04
Tor 0.2.1.4-alpha fixes a pair of crash bugs in 0.2.1.3-alpha.
o Major bugfixes:
- The address part of exit policies was not correctly written
to router descriptors. This generated router descriptors that failed
their self-checks. Noticed by phobos, fixed by Karsten. Bugfix
on 0.2.1.3-alpha.
- Tor triggered a false assert when extending a circuit to a relay
but we already have a connection open to that relay. Noticed by
phobos, fixed by Karsten. Bugfix on 0.2.1.3-alpha.
o Minor bugfixes:
- Fix a hidden service logging bug: in some edge cases, the router
descriptor of a previously picked introduction point becomes
obsolete and we need to give up on it rather than continually
complaining that it has become obsolete. Observed by xiando. Bugfix
on 0.2.1.3-alpha.
o Removed features:
- Take out the TestVia config option, since it was a workaround for
a bug that was fixed in Tor 0.1.1.21.
Changes in version 0.2.1.3-alpha - 2008-08-03
Tor 0.2.1.3-alpha implements most of the pieces to prevent
infinite-length circuit attacks (see proposal 110); fixes a bug that
might cause exit relays to corrupt streams they send back; allows
address patterns (e.g. 255.128.0.0/16) to appear in ExcludeNodes and
ExcludeExitNodes config options; and fixes a big pile of bugs.
o Bootstrapping bugfixes (on 0.2.1.x-alpha):
- Send a bootstrap problem "warn" event on the first problem if the
reason is NO_ROUTE (that is, our network is down).
o Major features:
- Implement most of proposal 110: The first K cells to be sent
along a circuit are marked as special "early" cells; only K "early"
cells will be allowed. Once this code is universal, we can block
certain kinds of DOS attack by requiring that EXTEND commands must
be sent using an "early" cell.
o Major bugfixes:
- Try to attach connections immediately upon receiving a RENDEZVOUS2
or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
on the client side when connecting to a hidden service. Bugfix
on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
- Ensure that two circuits can never exist on the same connection
with the same circuit ID, even if one is marked for close. This
is conceivably a bugfix for bug 779; fixes a bug on 0.1.0.4-rc.
o Minor features:
- When relays do their initial bandwidth measurement, don't limit
to just our entry guards for the test circuits. Otherwise we tend
to have multiple test circuits going through a single entry guard,
which makes our bandwidth test less accurate. Fixes part of bug 654;
patch contributed by Josh Albrecht.
- Add an ExcludeExitNodes option so users can list a set of nodes
that should be be excluded from the exit node position, but
allowed elsewhere. Implements proposal 151.
- Allow address patterns (e.g., 255.128.0.0/16) to appear in
ExcludeNodes and ExcludeExitNodes lists.
- Change the implementation of ExcludeNodes and ExcludeExitNodes to
be more efficient. Formerly it was quadratic in the number of
servers; now it should be linear. Fixes bug 509.
- Save 16-22 bytes per open circuit by moving the n_addr, n_port,
and n_conn_id_digest fields into a separate structure that's
only needed when the circuit has not yet attached to an n_conn.
o Minor bugfixes:
- Change the contrib/tor.logrotate script so it makes the new
logs as "_tor:_tor" rather than the default, which is generally
"root:wheel". Fixes bug 676, reported by Serge Koksharov.
- Stop using __attribute__((nonnull)) with GCC: it can give us useful
warnings (occasionally), but it can also cause the compiler to
eliminate error-checking code. Suggested by Peter Gutmann.
- When a hidden service is giving up on an introduction point candidate
that was not included in the last published rendezvous descriptor,
don't reschedule publication of the next descriptor. Fixes bug 763.
Bugfix on 0.0.9.3.
- Mark RendNodes, RendExcludeNodes, HiddenServiceNodes, and
HiddenServiceExcludeNodes as obsolete: they never worked properly,
and nobody claims to be using them. Fixes bug 754. Bugfix on
0.1.0.1-rc. Patch from Christian Wilms.
- Fix a small alignment and memory-wasting bug on buffer chunks.
Spotted by rovv.
o Minor bugfixes (controller):
- When closing an application-side connection because its circuit
is getting torn down, generate the stream event correctly.
Bugfix on 0.1.2.x. Anonymous patch.
o Removed features:
- Remove all backward-compatibility code to support relays running
versions of Tor so old that they no longer work at all on the
Tor network.
Changes in version 0.2.0.30 - 2008-07-15
o Minor bugfixes:
- Stop using __attribute__((nonnull)) with GCC: it can give us useful
warnings (occasionally), but it can also cause the compiler to
eliminate error-checking code. Suggested by Peter Gutmann.
Changes in version 0.2.0.29-rc - 2008-07-08
Tor 0.2.0.29-rc fixes two big bugs with using bridges, fixes more
hidden-service performance bugs, and fixes a bunch of smaller bugs.
o Major bugfixes:
- If you have more than one bridge but don't know their keys,
you would only launch a request for the descriptor of the first one
on your list. (Tor considered launching requests for the others, but
found that it already had a connection on the way for $0000...0000
so it didn't open another.) Bugfix on 0.2.0.x.
- If you have more than one bridge but don't know their keys, and the
connection to one of the bridges failed, you would cancel all
pending bridge connections. (After all, they all have the same
digest.) Bugfix on 0.2.0.x.
- When a hidden service was trying to establish an introduction point,
and Tor had built circuits preemptively for such purposes, we
were ignoring all the preemptive circuits and launching a new one
instead. Bugfix on 0.2.0.14-alpha.
- When a hidden service was trying to establish an introduction point,
and Tor *did* manage to reuse one of the preemptively built
circuits, it didn't correctly remember which one it used,
so it asked for another one soon after, until there were no
more preemptive circuits, at which point it launched one from
scratch. Bugfix on 0.0.9.x.
- Make directory servers include the X-Your-Address-Is: http header in
their responses even for begin_dir conns. Now clients who only
ever use begin_dir connections still have a way to learn their IP
address. Fixes bug 737; bugfix on 0.2.0.22-rc. Reported by goldy.
o Minor bugfixes:
- Fix a macro/CPP interaction that was confusing some compilers:
some GCCs don't like #if/#endif pairs inside macro arguments.
Fixes bug 707.
- Fix macro collision between OpenSSL 0.9.8h and Windows headers.
Fixes bug 704; fix from Steven Murdoch.
- When opening /dev/null in finish_daemonize(), do not pass the
O_CREAT flag. Fortify was complaining, and correctly so. Fixes
bug 742; fix from Michael Scherer. Bugfix on 0.0.2pre19.
- Correctly detect transparent proxy support on Linux hosts that
require in.h to be included before netfilter_ipv4.h. Patch
from coderman.
- Disallow session resumption attempts during the renegotiation
stage of the v2 handshake protocol. Clients should never be trying
session resumption at this point, but apparently some did, in
ways that caused the handshake to fail. Bugfix on 0.2.0.20-rc. Bug
found by Geoff Goodell.
Changes in version 0.2.1.2-alpha - 2008-06-20
Tor 0.2.1.2-alpha includes a new "TestingTorNetwork" config option to
make it easier to set up your own private Tor network; fixes several
big bugs with using more than one bridge relay; fixes a big bug with
offering hidden services quickly after Tor starts; and uses a better
API for reporting potential bootstrapping problems to the controller.
o Major features:
- New TestingTorNetwork config option to allow adjustment of
previously constant values that, while reasonable, could slow
bootstrapping. Implements proposal 135. Patch from Karsten.
o Major bugfixes:
- If you have more than one bridge but don't know their digests,
you would only learn a request for the descriptor of the first one
on your list. (Tor considered launching requests for the others, but
found that it already had a connection on the way for $0000...0000
so it didn't open another.) Bugfix on 0.2.0.x.
- If you have more than one bridge but don't know their digests,
and the connection to one of the bridges failed, you would cancel
all pending bridge connections. (After all, they all have the
same digest.) Bugfix on 0.2.0.x.
- When establishing a hidden service, introduction points that
originate from cannibalized circuits are completely ignored and not
included in rendezvous service descriptors. This might be another
reason for delay in making a hidden service available. Bugfix
from long ago (0.0.9.x?)
o Minor features:
- Allow OpenSSL to use dynamic locks if it wants.
- When building a consensus, do not include routers that are down.
This will cut down 30% to 40% on consensus size. Implements
proposal 138.
- In directory authorities' approved-routers files, allow
fingerprints with or without space.
- Add a "GETINFO /status/bootstrap-phase" controller option, so the
controller can query our current bootstrap state in case it attaches
partway through and wants to catch up.
- Send an initial "Starting" bootstrap status event, so we have a
state to start out in.
o Minor bugfixes:
- Asking for a conditional consensus at .../consensus/<fingerprints>
would crash a dirserver if it did not already have a
consensus. Bugfix on 0.2.1.1-alpha.
- Clean up some macro/CPP interactions: some GCC versions don't like
#if/#endif pairs inside macro arguments. Fixes bug 707. Bugfix on
0.2.0.x.
o Bootstrapping bugfixes (on 0.2.1.1-alpha):
- Directory authorities shouldn't complain about bootstrapping
problems just because they do a lot of reachability testing and
some of the connection attempts fail.
- Start sending "count" and "recommendation" key/value pairs in
bootstrap problem status events, so the controller can hear about
problems even before Tor decides they're worth reporting for sure.
- If you're using bridges, generate "bootstrap problem" warnings
as soon as you run out of working bridges, rather than waiting
for ten failures -- which will never happen if you have less than
ten bridges.
- If we close our OR connection because there's been a circuit
pending on it for too long, we were telling our bootstrap status
events "REASON=NONE". Now tell them "REASON=TIMEOUT".
Changes in version 0.2.1.1-alpha - 2008-06-13
Tor 0.2.1.1-alpha fixes a lot of memory fragmentation problems that
were making the Tor process bloat especially on Linux; makes our TLS
handshake blend in better; sends "bootstrap phase" status events to
the controller, so it can keep the user informed of progress (and
problems) fetching directory information and establishing circuits;
and adds a variety of smaller features.
o Major features:
- More work on making our TLS handshake blend in: modify the list
of ciphers advertised by OpenSSL in client mode to even more
closely resemble a common web browser. We cheat a little so that
we can advertise ciphers that the locally installed OpenSSL doesn't
know about.
- Start sending "bootstrap phase" status events to the controller,
so it can keep the user informed of progress fetching directory
information and establishing circuits. Also inform the controller
if we think we're stuck at a particular bootstrap phase. Implements
proposal 137.
- Resume using OpenSSL's RAND_poll() for better (and more portable)
cross-platform entropy collection again. We used to use it, then
stopped using it because of a bug that could crash systems that
called RAND_poll when they had a lot of fds open. It looks like the
bug got fixed in late 2006. Our new behavior is to call RAND_poll()
at startup, and to call RAND_poll() when we reseed later only if
we have a non-buggy OpenSSL version.
o Major bugfixes:
- When we choose to abandon a new entry guard because we think our
older ones might be better, close any circuits pending on that
new entry guard connection. This fix should make us recover much
faster when our network is down and then comes back. Bugfix on
0.1.2.8-beta; found by lodger.
o Memory fixes and improvements:
- Add a malloc_good_size implementation to OpenBSD_malloc_linux.c,
to avoid unused RAM in buffer chunks and memory pools.
- Speed up parsing and cut down on memory fragmentation by using
stack-style allocations for parsing directory objects. Previously,
this accounted for over 40% of allocations from within Tor's code
on a typical directory cache.
- Use a Bloom filter rather than a digest-based set to track which
descriptors we need to keep around when we're cleaning out old
router descriptors. This speeds up the computation significantly,
and may reduce fragmentation.
- Reduce the default smartlist size from 32 to 16; it turns out that
most smartlists hold around 8-12 elements tops.
- Make dumpstats() log the fullness and size of openssl-internal
buffers.
- If the user has applied the experimental SSL_MODE_RELEASE_BUFFERS
patch to their OpenSSL, turn it on to save memory on servers. This
patch will (with any luck) get included in a mainline distribution
before too long.
- Never use OpenSSL compression: it wastes RAM and CPU trying to
compress cells, which are basically all encrypted, compressed,
or both.
o Minor bugfixes:
- Stop reloading the router list from disk for no reason when we
run out of reachable directory mirrors. Once upon a time reloading
it would set the 'is_running' flag back to 1 for them. It hasn't
done that for a long time.
- In very rare situations new hidden service descriptors were
published earlier than 30 seconds after the last change to the
service. (We currently think that a hidden service descriptor
that's been stable for 30 seconds is worth publishing.)
o Minor features:
- Allow separate log levels to be configured for different logging
domains. For example, this allows one to log all notices, warnings,
or errors, plus all memory management messages of level debug or
higher, with: Log [MM] debug-err [*] notice-err file /var/log/tor.
- Add a couple of extra warnings to --enable-gcc-warnings for GCC 4.3,
and stop using a warning that had become unfixably verbose under
GCC 4.3.
- New --hush command-line option similar to --quiet. While --quiet
disables all logging to the console on startup, --hush limits the
output to messages of warning and error severity.
- Servers support a new URL scheme for consensus downloads that
allows the client to specify which authorities are trusted.
The server then only sends the consensus if the client will trust
it. Otherwise a 404 error is sent back. Clients use this
new scheme when the server supports it (meaning it's running
0.2.1.1-alpha or later). Implements proposal 134.
- New configure/torrc options (--enable-geoip-stats,
DirRecordUsageByCountry) to record how many IPs we've served
directory info to in each country code, how many status documents
total we've sent to each country code, and what share of the total
directory requests we should expect to see.
- Use the TLS1 hostname extension to more closely resemble browser
behavior.
- Lots of new unit tests.
- Add a macro to implement the common pattern of iterating through
two parallel lists in lockstep.
Changes in version 0.2.0.28-rc - 2008-06-13
Tor 0.2.0.28-rc fixes an anonymity-related bug, fixes a hidden-service
performance bug, and fixes a bunch of smaller bugs.
o Anonymity fixes:
- Fix a bug where, when we were choosing the 'end stream reason' to
put in our relay end cell that we send to the exit relay, Tor
clients on Windows were sometimes sending the wrong 'reason'. The
anonymity problem is that exit relays may be able to guess whether
the client is running Windows, thus helping partition the anonymity
set. Down the road we should stop sending reasons to exit relays,
or otherwise prevent future versions of this bug.
o Major bugfixes:
- While setting up a hidden service, some valid introduction circuits
were overlooked and abandoned. This might be the reason for
the long delay in making a hidden service available. Bugfix on
0.2.0.14-alpha.
o Minor features:
- Update to the "June 9 2008" ip-to-country file.
- Run 'make test' as part of 'make dist', so we stop releasing so
many development snapshots that fail their unit tests.
o Minor bugfixes:
- When we're checking if we have enough dir info for each relay
to begin establishing circuits, make sure that we actually have
the descriptor listed in the consensus, not just any descriptor.
Bugfix on 0.1.2.x.
- Bridge relays no longer print "xx=0" in their extrainfo document
for every single country code in the geoip db. Bugfix on
0.2.0.27-rc.
- Only warn when we fail to load the geoip file if we were planning to
include geoip stats in our extrainfo document. Bugfix on 0.2.0.27-rc.
- If we change our MaxAdvertisedBandwidth and then reload torrc,
Tor won't realize it should publish a new relay descriptor. Fixes
bug 688, reported by mfr. Bugfix on 0.1.2.x.
- When we haven't had any application requests lately, don't bother
logging that we have expired a bunch of descriptors. Bugfix
on 0.1.2.x.
- Make relay cells written on a connection count as non-padding when
tracking how long a connection has been in use. Bugfix on
0.2.0.1-alpha. Spotted by lodger.
- Fix unit tests in 0.2.0.27-rc.
- Fix compile on Windows.
Changes in version 0.2.0.27-rc - 2008-06-03
Tor 0.2.0.27-rc adds a few features we left out of the earlier
release candidates. In particular, we now include an IP-to-country
GeoIP database, so controllers can easily look up what country a
given relay is in, and so bridge relays can give us some sanitized
summaries about which countries are making use of bridges. (See proposal
126-geoip-fetching.txt for details.)
o Major features:
- Include an IP-to-country GeoIP file in the tarball, so bridge
relays can report sanitized summaries of the usage they're seeing.
o Minor features:
- Add a "PURPOSE=" argument to "STREAM NEW" events, as suggested by
Robert Hogan. Fixes the first part of bug 681.
- Make bridge authorities never serve extrainfo docs.
- Add support to detect Libevent versions in the 1.4.x series
on mingw.
- Fix build on gcc 4.3 with --enable-gcc-warnings set.
- Include a new contrib/tor-exit-notice.html file that exit relay
operators can put on their website to help reduce abuse queries.
o Minor bugfixes:
- When tunneling an encrypted directory connection, and its first
circuit fails, do not leave it unattached and ask the controller
to deal. Fixes the second part of bug 681.
- Make bridge authorities correctly expire old extrainfo documents
from time to time.
Changes in version 0.2.0.26-rc - 2008-05-13
Tor 0.2.0.26-rc fixes a major security vulnerability caused by a bug
in Debian's OpenSSL packages. All users running any 0.2.0.x version
should upgrade, whether they're running Debian or not.
o Major security fixes:
- Use new V3 directory authority keys on the tor26, gabelmoo, and
moria1 V3 directory authorities. The old keys were generated with
a vulnerable version of Debian's OpenSSL package, and must be
considered compromised. Other authorities' keys were not generated
with an affected version of OpenSSL.
o Major bugfixes:
- List authority signatures as "unrecognized" based on DirServer
lines, not on cert cache. Bugfix on 0.2.0.x.
o Minor features:
- Add a new V3AuthUseLegacyKey option to make it easier for
authorities to change their identity keys if they have to.
Changes in version 0.2.0.25-rc - 2008-04-23
Tor 0.2.0.25-rc makes Tor work again on OS X and certain BSDs.
o Major bugfixes:
- Remember to initialize threading before initializing logging.
Otherwise, many BSD-family implementations will crash hard on
startup. Fixes bug 671. Bugfix on 0.2.0.24-rc.
o Minor bugfixes:
- Authorities correctly free policies on bad servers on
exit. Fixes bug 672. Bugfix on 0.2.0.x.
Changes in version 0.2.0.24-rc - 2008-04-22
Tor 0.2.0.24-rc adds dizum (run by Alex de Joode) as the new sixth
v3 directory authority, makes relays with dynamic IP addresses and no
DirPort notice more quickly when their IP address changes, fixes a few
rare crashes and memory leaks, and fixes a few other miscellaneous bugs.
o New directory authorities:
- Take lefkada out of the list of v3 directory authorities, since
it has been down for months.
- Set up dizum (run by Alex de Joode) as the new sixth v3 directory
authority.
o Major bugfixes:
- Detect address changes more quickly on non-directory mirror
relays. Bugfix on 0.2.0.18-alpha; fixes bug 652.
o Minor features (security):
- Reject requests for reverse-dns lookup of names that are in
a private address space. Patch from lodger.
- Non-exit relays no longer allow DNS requests. Fixes bug 619. Patch
from lodger.
o Minor bugfixes (crashes):
- Avoid a rare assert that can trigger when Tor doesn't have much
directory information yet and it tries to fetch a v2 hidden
service descriptor. Fixes bug 651, reported by nwf.
- Initialize log mutex before initializing dmalloc. Otherwise,
running with dmalloc would crash. Bugfix on 0.2.0.x-alpha.
- Use recursive pthread mutexes in order to avoid deadlock when
logging debug-level messages to a controller. Bug spotted by nwf,
bugfix on 0.2.0.16-alpha.
o Minor bugfixes (resource management):
- Keep address policies from leaking memory: start their refcount
at 1, not 2. Bugfix on 0.2.0.16-alpha.
- Free authority certificates on exit, so they don't look like memory
leaks. Bugfix on 0.2.0.19-alpha.
- Free static hashtables for policy maps and for TLS connections on
shutdown, so they don't look like memory leaks. Bugfix on 0.2.0.x.
- Avoid allocating extra space when computing consensuses on 64-bit
platforms. Bug spotted by aakova.
o Minor bugfixes (misc):
- Do not read the configuration file when we've only been told to
generate a password hash. Fixes bug 643. Bugfix on 0.0.9pre5. Fix
based on patch from Sebastian Hahn.
- Exit relays that are used as a client can now reach themselves
using the .exit notation, rather than just launching an infinite
pile of circuits. Fixes bug 641. Reported by Sebastian Hahn.
- When attempting to open a logfile fails, tell us why.
- Fix a dumb bug that was preventing us from knowing that we should
preemptively build circuits to handle expected directory requests.
Fixes bug 660. Bugfix on 0.1.2.x.
- Warn less verbosely about clock skew from netinfo cells from
untrusted sources. Fixes bug 663.
- Make controller stream events for DNS requests more consistent,
by adding "new stream" events for DNS requests, and removing
spurious "stream closed" events" for cached reverse resolves.
Patch from mwenge. Fixes bug 646.
- Correctly notify one-hop connections when a circuit build has
failed. Possible fix for bug 669. Found by lodger.
Changes in version 0.2.0.23-rc - 2008-03-24
Tor 0.2.0.23-rc is the fourth release candidate for the 0.2.0 series. It
makes bootstrapping faster if the first directory mirror you contact
is down. The bundles also include the new Vidalia 0.1.2 release.
o Major bugfixes:
- When a tunneled directory request is made to a directory server
that's down, notice after 30 seconds rather than 120 seconds. Also,
fail any begindir streams that are pending on it, so they can
retry elsewhere. This was causing multi-minute delays on bootstrap.
Changes in version 0.2.0.22-rc - 2008-03-18
Tor 0.2.0.22-rc is the third release candidate for the 0.2.0 series. It
enables encrypted directory connections by default for non-relays, fixes
some broken TLS behavior we added in 0.2.0.20-rc, and resolves many
other bugs. The bundles also include Vidalia 0.1.1 and Torbutton 1.1.17.
o Major features:
- Enable encrypted directory connections by default for non-relays,
so censor tools that block Tor directory connections based on their
plaintext patterns will no longer work. This means Tor works in
certain censored countries by default again.
o Major bugfixes:
- Make sure servers always request certificates from clients during
TLS renegotiation. Reported by lodger; bugfix on 0.2.0.20-rc.
- Do not enter a CPU-eating loop when a connection is closed in
the middle of client-side TLS renegotiation. Fixes bug 622. Bug
diagnosed by lodger; bugfix on 0.2.0.20-rc.
- Fix assertion failure that could occur when a blocked circuit
became unblocked, and it had pending client DNS requests. Bugfix
on 0.2.0.1-alpha. Fixes bug 632.
o Minor bugfixes (on 0.1.2.x):
- Generate "STATUS_SERVER" events rather than misspelled
"STATUS_SEVER" events. Caught by mwenge.
- When counting the number of bytes written on a TLS connection,
look at the BIO actually used for writing to the network, not
at the BIO used (sometimes) to buffer data for the network.
Looking at different BIOs could result in write counts on the
order of ULONG_MAX. Fixes bug 614.
- On Windows, correctly detect errors when listing the contents of
a directory. Fix from lodger.
o Minor bugfixes (on 0.2.0.x):
- Downgrade "sslv3 alert handshake failure" message to INFO.
- If we set RelayBandwidthRate and RelayBandwidthBurst very high but
left BandwidthRate and BandwidthBurst at the default, we would be
silently limited by those defaults. Now raise them to match the
RelayBandwidth* values.
- Fix the SVK version detection logic to work correctly on a branch.
- Make --enable-openbsd-malloc work correctly on Linux with alpha
CPUs. Fixes bug 625.
- Logging functions now check that the passed severity is sane.
- Use proper log levels in the testsuite call of
get_interface_address6().
- When using a nonstandard malloc, do not use the platform values for
HAVE_MALLOC_GOOD_SIZE or HAVE_MALLOC_USABLE_SIZE.
- Make the openbsd malloc code use 8k pages on alpha CPUs and
16k pages on ia64.
- Detect mismatched page sizes when using --enable-openbsd-malloc.
- Avoid double-marked-for-close warning when certain kinds of invalid
.in-addr.arpa addresses are passed to the DNSPort. Part of a fix
for bug 617. Bugfix on 0.2.0.1-alpha.
- Make sure that the "NULL-means-reject *:*" convention is followed by
all the policy manipulation functions, avoiding some possible crash
bugs. Bug found by lodger. Bugfix on 0.2.0.16-alpha.
- Fix the implementation of ClientDNSRejectInternalAddresses so that it
actually works, and doesn't warn about every single reverse lookup.
Fixes the other part of bug 617. Bugfix on 0.2.0.1-alpha.
o Minor features:
- Only log guard node status when guard node status has changed.
- Downgrade the 3 most common "INFO" messages to "DEBUG". This will
make "INFO" 75% less verbose.
Changes in version 0.2.0.21-rc - 2008-03-02
Tor 0.2.0.21-rc is the second release candidate for the 0.2.0 series. It
makes Tor work well with Vidalia again, fixes a rare assert bug,
and fixes a pair of more minor bugs. The bundles also include Vidalia
0.1.0 and Torbutton 1.1.16.
o Major bugfixes:
- The control port should declare that it requires password auth
when HashedControlSessionPassword is set too. Patch from Matt Edman;
bugfix on 0.2.0.20-rc. Fixes bug 615.
- Downgrade assert in connection_buckets_decrement() to a log message.
This may help us solve bug 614, and in any case will make its
symptoms less severe. Bugfix on 0.2.0.20-rc. Reported by fredzupy.
- We were sometimes miscounting the number of bytes read from the
network, causing our rate limiting to not be followed exactly.
Bugfix on 0.2.0.16-alpha. Reported by lodger.
o Minor bugfixes:
- Fix compilation with OpenSSL 0.9.8 and 0.9.8a. All other supported
OpenSSL versions should have been working fine. Diagnosis and patch
from lodger, Karsten Loesing, and Sebastian Hahn. Fixes bug 616.
Bugfix on 0.2.0.20-rc.
Changes in version 0.2.0.20-rc - 2008-02-24
Tor 0.2.0.20-rc is the first release candidate for the 0.2.0 series. It
makes more progress towards normalizing Tor's TLS handshake, makes
hidden services work better again, helps relays bootstrap if they don't
know their IP address, adds optional support for linking in openbsd's
allocator or tcmalloc, allows really fast relays to scale past 15000
sockets, and fixes a bunch of minor bugs reported by Veracode.
o Major features:
- Enable the revised TLS handshake based on the one designed by
Steven Murdoch in proposal 124, as revised in proposal 130. It
includes version negotiation for OR connections as described in
proposal 105. The new handshake is meant to be harder for censors
to fingerprint, and it adds the ability to detect certain kinds of
man-in-the-middle traffic analysis attacks. The version negotiation
feature will allow us to improve Tor's link protocol more safely
in the future.
- Choose which bridge to use proportional to its advertised bandwidth,
rather than uniformly at random. This should speed up Tor for
bridge users. Also do this for people who set StrictEntryNodes.
- When a TrackHostExits-chosen exit fails too many times in a row,
stop using it. Bugfix on 0.1.2.x; fixes bug 437.
o Major bugfixes:
- Resolved problems with (re-)fetching hidden service descriptors.
Patch from Karsten Loesing; fixes problems with 0.2.0.18-alpha
and 0.2.0.19-alpha.
- If we only ever used Tor for hidden service lookups or posts, we
would stop building circuits and start refusing connections after
24 hours, since we falsely believed that Tor was dormant. Reported
by nwf; bugfix on 0.1.2.x.
- Servers that don't know their own IP address should go to the
authorities for their first directory fetch, even if their DirPort
is off or if they don't know they're reachable yet. This will help
them bootstrap better. Bugfix on 0.2.0.18-alpha; fixes bug 609.
- When counting the number of open sockets, count not only the number
of sockets we have received from the socket() call, but also
the number we've gotten from accept() and socketpair(). This bug
made us fail to count all sockets that we were using for incoming
connections. Bugfix on 0.2.0.x.
- Fix code used to find strings within buffers, when those strings
are not in the first chunk of the buffer. Bugfix on 0.2.0.x.
- Fix potential segfault when parsing HTTP headers. Bugfix on 0.2.0.x.
- Add a new __HashedControlSessionPassword option for controllers
to use for one-off session password hashes that shouldn't get
saved to disk by SAVECONF --- Vidalia users were accumulating a
pile of HashedControlPassword lines in their torrc files, one for
each time they had restarted Tor and then clicked Save. Make Tor
automatically convert "HashedControlPassword" to this new option but
only when it's given on the command line. Partial fix for bug 586.
o Minor features (performance):
- Tune parameters for cell pool allocation to minimize amount of
RAM overhead used.
- Add OpenBSD malloc code from phk as an optional malloc
replacement on Linux: some glibc libraries do very poorly
with Tor's memory allocation patterns. Pass
--enable-openbsd-malloc to get the replacement malloc code.
- Add a --with-tcmalloc option to the configure script to link
against tcmalloc (if present). Does not yet search for
non-system include paths.
- Stop imposing an arbitrary maximum on the number of file descriptors
used for busy servers. Bug reported by Olaf Selke; patch from
Sebastian Hahn.
o Minor features (other):
- When SafeLogging is disabled, log addresses along with all TLS
errors.
- When building with --enable-gcc-warnings, check for whether Apple's
warning "-Wshorten-64-to-32" is available.
- Add a --passphrase-fd argument to the tor-gencert command for
scriptability.
o Minor bugfixes (memory leaks and code problems):
- We were leaking a file descriptor if Tor started with a zero-length
cached-descriptors file. Patch by freddy77; bugfix on 0.1.2.
- Detect size overflow in zlib code. Reported by Justin Ferguson and
Dan Kaminsky.
- We were comparing the raw BridgePassword entry with a base64'ed
version of it, when handling a "/tor/networkstatus-bridges"
directory request. Now compare correctly. Noticed by Veracode.
- Recover from bad tracked-since value in MTBF-history file.
Should fix bug 537.
- Alter the code that tries to recover from unhandled write
errors, to not try to flush onto a socket that's given us
unhandled errors. Bugfix on 0.1.2.x.
- Make Unix controlsockets work correctly on OpenBSD. Patch from
tup. Bugfix on 0.2.0.3-alpha.
o Minor bugfixes (other):
- If we have an extra-info document for our server, always make
it available on the control port, even if we haven't gotten
a copy of it from an authority yet. Patch from mwenge.
- Log the correct memory chunk sizes for empty RAM chunks in mempool.c.
- Directory mirrors no longer include a guess at the client's IP
address if the connection appears to be coming from the same /24
network; it was producing too many wrong guesses.
- Make the new hidden service code respect the SafeLogging setting.
Bugfix on 0.2.0.x. Patch from Karsten.
- When starting as an authority, do not overwrite all certificates
cached from other authorities. Bugfix on 0.2.0.x. Fixes bug 606.
- If we're trying to flush the last bytes on a connection (for
example, when answering a directory request), reset the
time-to-give-up timeout every time we manage to write something
on the socket. Bugfix on 0.1.2.x.
- Change the behavior of "getinfo status/good-server-descriptor"
so it doesn't return failure when any authority disappears.
- Even though the man page said that "TrackHostExits ." should
work, nobody had ever implemented it. Bugfix on 0.1.0.x.
- Report TLS "zero return" case as a "clean close" and "IO error"
as a "close". Stop calling closes "unexpected closes": existing
Tors don't use SSL_close(), so having a connection close without
the TLS shutdown handshake is hardly unexpected.
- Send NAMESERVER_STATUS messages for a single failed nameserver
correctly.
o Code simplifications and refactoring:
- Remove the tor_strpartition function: its logic was confused,
and it was only used for one thing that could be implemented far
more easily.
Changes in version 0.2.0.19-alpha - 2008-02-09
Tor 0.2.0.19-alpha makes more progress towards normalizing Tor's TLS
handshake, makes path selection for relays more secure and IP address
guessing more robust, and generally fixes a lot of bugs in preparation
for calling the 0.2.0 branch stable.
o Major features:
- Do not include recognizeable strings in the commonname part of
Tor's x509 certificates.
o Major bugfixes:
- If we're a relay, avoid picking ourselves as an introduction point,
a rendezvous point, or as the final hop for internal circuits. Bug
reported by taranis and lodger. Bugfix on 0.1.2.x.
- Patch from "Andrew S. Lists" to catch when we contact a directory
mirror at IP address X and he says we look like we're coming from
IP address X. Bugfix on 0.1.2.x.
o Minor features (security):
- Be more paranoid about overwriting sensitive memory on free(),
as a defensive programming tactic to ensure forward secrecy.
o Minor features (directory authority):
- Actually validate the options passed to AuthDirReject,
AuthDirInvalid, AuthDirBadDir, and AuthDirBadExit.
- Reject router descriptors with out-of-range bandwidthcapacity or
bandwidthburst values.
o Minor features (controller):
- Reject controller commands over 1MB in length. This keeps rogue
processes from running us out of memory.
o Minor features (misc):
- Give more descriptive well-formedness errors for out-of-range
hidden service descriptor/protocol versions.
- Make memory debugging information describe more about history
of cell allocation, so we can help reduce our memory use.
o Deprecated features (controller):
- The status/version/num-versioning and status/version/num-concurring
GETINFO options are no longer useful in the v3 directory protocol:
treat them as deprecated, and warn when they're used.
o Minor bugfixes:
- When our consensus networkstatus has been expired for a while, stop
being willing to build circuits using it. Fixes bug 401. Bugfix
on 0.1.2.x.
- Directory caches now fetch certificates from all authorities
listed in a networkstatus consensus, even when they do not
recognize them. Fixes bug 571. Bugfix on 0.2.0.x.
- When connecting to a bridge without specifying its key, insert
the connection into the identity-to-connection map as soon as
a key is learned. Fixes bug 574. Bugfix on 0.2.0.x.
- Detect versions of OS X where malloc_good_size() is present in the
library but never actually declared. Resolves bug 587. Bugfix
on 0.2.0.x.
- Stop incorrectly truncating zlib responses to directory authority
signature download requests. Fixes bug 593. Bugfix on 0.2.0.x.
- Stop recommending that every server operator send mail to tor-ops.
Resolves bug 597. Bugfix on 0.1.2.x.
- Don't trigger an assert if we start a directory authority with a
private IP address (like 127.0.0.1).
- Avoid possible failures when generating a directory with routers
with over-long versions strings, or too many flags set. Bugfix
on 0.1.2.x.
- If an attempt to launch a DNS resolve request over the control
port fails because we have overrun the limit on the number of
connections, tell the controller that the request has failed.
- Avoid using too little bandwidth when our clock skips a few
seconds. Bugfix on 0.1.2.x.
- Fix shell error when warning about missing packages in configure
script, on Fedora or Red Hat machines. Bugfix on 0.2.0.x.
- Do not become confused when receiving a spurious VERSIONS-like
cell from a confused v1 client. Bugfix on 0.2.0.x.
- Re-fetch v2 (as well as v0) rendezvous descriptors when all
introduction points for a hidden service have failed. Patch from
Karsten Loesing. Bugfix on 0.2.0.x.
o Code simplifications and refactoring:
- Remove some needless generality from cpuworker code, for improved
type-safety.
- Stop overloading the circuit_t.onionskin field for both "onionskin
from a CREATE cell that we are waiting for a cpuworker to be
assigned" and "onionskin from an EXTEND cell that we are going to
send to an OR as soon as we are connected". Might help with bug 600.
- Add an in-place version of aes_crypt() so that we can avoid doing a
needless memcpy() call on each cell payload.
Changes in version 0.2.0.18-alpha - 2008-01-25
Tor 0.2.0.18-alpha adds a sixth v3 directory authority run by CCC,
fixes a big memory leak in 0.2.0.17-alpha, and adds new config options
that can warn or reject connections to ports generally associated with
vulnerable-plaintext protocols.
o New directory authorities:
- Set up dannenberg (run by CCC) as the sixth v3 directory
authority.
o Major bugfixes:
- Fix a major memory leak when attempting to use the v2 TLS
handshake code. Bugfix on 0.2.0.x; fixes bug 589.
- We accidentally enabled the under-development v2 TLS handshake
code, which was causing log entries like "TLS error while
renegotiating handshake". Disable it again. Resolves bug 590.
- We were computing the wrong Content-Length: header for directory
responses that need to be compressed on the fly, causing clients
asking for those items to always fail. Bugfix on 0.2.0.x; partially
fixes bug 593.
o Major features:
- Avoid going directly to the directory authorities even if you're a
relay, if you haven't found yourself reachable yet or if you've
decided not to advertise your dirport yet. Addresses bug 556.
- If we've gone 12 hours since our last bandwidth check, and we
estimate we have less than 50KB bandwidth capacity but we could
handle more, do another bandwidth test.
- New config options WarnPlaintextPorts and RejectPlaintextPorts so
Tor can warn and/or refuse connections to ports commonly used with
vulnerable-plaintext protocols. Currently we warn on ports 23,
109, 110, and 143, but we don't reject any.
o Minor bugfixes:
- When we setconf ClientOnly to 1, close any current OR and Dir
listeners. Reported by mwenge.
- When we get a consensus that's been signed by more people than
we expect, don't log about it; it's not a big deal. Reported
by Kyle Williams.
o Minor features:
- Don't answer "/tor/networkstatus-bridges" directory requests if
the request isn't encrypted.
- Make "ClientOnly 1" config option disable directory ports too.
- Patches from Karsten Loesing to make v2 hidden services more
robust: work even when there aren't enough HSDir relays available;
retry when a v2 rend desc fetch fails; but don't retry if we
already have a usable v0 rend desc.
Changes in version 0.2.0.17-alpha - 2008-01-17
Tor 0.2.0.17-alpha makes the tarball build cleanly again (whoops).
o Compile fixes:
- Make the tor-gencert man page get included correctly in the tarball.
Changes in version 0.2.0.16-alpha - 2008-01-17
Tor 0.2.0.16-alpha adds a fifth v3 directory authority run by Karsten
Loesing, and generally cleans up a lot of features and minor bugs.
o New directory authorities:
- Set up gabelmoo (run by Karsten Loesing) as the fifth v3 directory
authority.
o Major performance improvements:
- Switch our old ring buffer implementation for one more like that
used by free Unix kernels. The wasted space in a buffer with 1mb
of data will now be more like 8k than 1mb. The new implementation
also avoids realloc();realloc(); patterns that can contribute to
memory fragmentation.
o Minor features:
- Configuration files now accept C-style strings as values. This
helps encode characters not allowed in the current configuration
file format, such as newline or #. Addresses bug 557.
- Although we fixed bug 539 (where servers would send HTTP status 503
responses _and_ send a body too), there are still servers out
there that haven't upgraded. Therefore, make clients parse such
bodies when they receive them.
- When we're not serving v2 directory information, there is no reason
to actually keep any around. Remove the obsolete files and directory
on startup if they are very old and we aren't going to serve them.
o Minor performance improvements:
- Reference-count and share copies of address policy entries; only 5%
of them were actually distinct.
- Never walk through the list of logs if we know that no log is
interested in a given message.
o Minor bugfixes:
- When an authority has not signed a consensus, do not try to
download a nonexistent "certificate with key 00000000". Bugfix
on 0.2.0.x. Fixes bug 569.
- Fix a rare assert error when we're closing one of our threads:
use a mutex to protect the list of logs, so we never write to the
list as it's being freed. Bugfix on 0.1.2.x. Fixes the very rare
bug 575, which is kind of the revenge of bug 222.
- Patch from Karsten Loesing to complain less at both the client
and the relay when a relay used to have the HSDir flag but doesn't
anymore, and we try to upload a hidden service descriptor.
- Stop leaking one cert per TLS context. Fixes bug 582. Bugfix on
0.2.0.15-alpha.
- Do not try to download missing certificates until we have tried
to check our fallback consensus. Fixes bug 583.
- Make bridges round reported GeoIP stats info up to the nearest
estimate, not down. Now we can distinguish between "0 people from
this country" and "1 person from this country".
- Avoid a spurious free on base64 failure. Bugfix on 0.1.2.
- Avoid possible segfault if key generation fails in
crypto_pk_hybrid_encrypt. Bugfix on 0.2.0.
- Avoid segfault in the case where a badly behaved v2 versioning
directory sends a signed networkstatus with missing client-versions.
Bugfix on 0.1.2.
- Avoid segfaults on certain complex invocations of
router_get_by_hexdigest(). Bugfix on 0.1.2.
- Correct bad index on array access in parse_http_time(). Bugfix
on 0.2.0.
- Fix possible bug in vote generation when server versions are present
but client versions are not.
- Fix rare bug on REDIRECTSTREAM control command when called with no
port set: it could erroneously report an error when none had
happened.
- Avoid bogus crash-prone, leak-prone tor_realloc when we're
compressing large objects and find ourselves with more than 4k
left over. Bugfix on 0.2.0.
- Fix a small memory leak when setting up a hidden service.
- Fix a few memory leaks that could in theory happen under bizarre
error conditions.
- Fix an assert if we post a general-purpose descriptor via the
control port but that descriptor isn't mentioned in our current
network consensus. Bug reported by Jon McLachlan; bugfix on
0.2.0.9-alpha.
o Minor features (controller):
- Get NS events working again. Patch from tup.
- The GETCONF command now escapes and quotes configuration values
that don't otherwise fit into the torrc file.
- The SETCONF command now handles quoted values correctly.
o Minor features (directory authorities):
- New configuration options to override default maximum number of
servers allowed on a single IP address. This is important for
running a test network on a single host.
- Actually implement the -s option to tor-gencert.
- Add a manual page for tor-gencert.
o Minor features (bridges):
- Bridge authorities no longer serve bridge descriptors over
unencrypted connections.
o Minor features (other):
- Add hidden services and DNSPorts to the list of things that make
Tor accept that it has running ports. Change starting Tor with no
ports from a fatal error to a warning; we might change it back if
this turns out to confuse anybody. Fixes bug 579.
Changes in version 0.1.2.19 - 2008-01-17
Tor 0.1.2.19 fixes a huge memory leak on exit relays, makes the default
exit policy a little bit more conservative so it's safer to run an
exit relay on a home system, and fixes a variety of smaller issues.
o Security fixes:
- Exit policies now reject connections that are addressed to a
relay's public (external) IP address too, unless
ExitPolicyRejectPrivate is turned off. We do this because too
many relays are running nearby to services that trust them based
on network address.
o Major bugfixes:
- When the clock jumps forward a lot, do not allow the bandwidth
buckets to become negative. Fixes bug 544.
- Fix a memory leak on exit relays; we were leaking a cached_resolve_t
on every successful resolve. Reported by Mike Perry.
- Purge old entries from the "rephist" database and the hidden
service descriptor database even when DirPort is zero.
- Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
crashing or mis-answering these requests.
- When we decide to send a 503 response to a request for servers, do
not then also send the server descriptors: this defeats the whole
purpose. Fixes bug 539.
o Minor bugfixes:
- Changing the ExitPolicyRejectPrivate setting should cause us to
rebuild our server descriptor.
- Fix handling of hex nicknames when answering controller requests for
networkstatus by name, or when deciding whether to warn about
unknown routers in a config option. (Patch from mwenge.)
- Fix a couple of hard-to-trigger autoconf problems that could result
in really weird results on platforms whose sys/types.h files define
nonstandard integer types.
- Don't try to create the datadir when running --verify-config or
--hash-password. Resolves bug 540.
- If we were having problems getting a particular descriptor from the
directory caches, and then we learned about a new descriptor for
that router, we weren't resetting our failure count. Reported
by lodger.
- Although we fixed bug 539 (where servers would send HTTP status 503
responses _and_ send a body too), there are still servers out there
that haven't upgraded. Therefore, make clients parse such bodies
when they receive them.
- Run correctly on systems where rlim_t is larger than unsigned long.
This includes some 64-bit systems.
- Run correctly on platforms (like some versions of OS X 10.5) where
the real limit for number of open files is OPEN_FILES, not rlim_max
from getrlimit(RLIMIT_NOFILES).
- Avoid a spurious free on base64 failure.
- Avoid segfaults on certain complex invocations of
router_get_by_hexdigest().
- Fix rare bug on REDIRECTSTREAM control command when called with no
port set: it could erroneously report an error when none had
happened.
Changes in version 0.2.0.15-alpha - 2007-12-25
Tor 0.2.0.14-alpha and 0.2.0.15-alpha fix a bunch of bugs with the
features added in 0.2.0.13-alpha.
o Major bugfixes:
- Fix several remotely triggerable asserts based on DirPort requests
for a v2 or v3 networkstatus object before we were prepared. This
was particularly bad for 0.2.0.13 and later bridge relays, who
would never have a v2 networkstatus and would thus always crash
when used. Bugfixes on 0.2.0.x.
- Estimate the v3 networkstatus size more accurately, rather than
estimating it at zero bytes and giving it artificially high priority
compared to other directory requests. Bugfix on 0.2.0.x.
o Minor bugfixes:
- Fix configure.in logic for cross-compilation.
- When we load a bridge descriptor from the cache, and it was
previously unreachable, mark it as retriable so we won't just
ignore it. Also, try fetching a new copy immediately. Bugfixes
on 0.2.0.13-alpha.
- The bridge GeoIP stats were counting other relays, for example
self-reachability and authority-reachability tests.
o Minor features:
- Support compilation to target iPhone; patch from cjacker huang.
To build for iPhone, pass the --enable-iphone option to configure.
Changes in version 0.2.0.14-alpha - 2007-12-23
o Major bugfixes:
- Fix a crash on startup if you install Tor 0.2.0.13-alpha fresh
without a datadirectory from a previous Tor install. Reported
by Zax.
- Fix a crash when we fetch a descriptor that turns out to be
unexpected (it used to be in our networkstatus when we started
fetching it, but it isn't in our current networkstatus), and we
aren't using bridges. Bugfix on 0.2.0.x.
- Fix a crash when accessing hidden services: it would work the first
time you use a given introduction point for your service, but
on subsequent requests we'd be using garbage memory. Fixed by
Karsten Loesing. Bugfix on 0.2.0.13-alpha.
- Fix a crash when we load a bridge descriptor from disk but we don't
currently have a Bridge line for it in our torrc. Bugfix on
0.2.0.13-alpha.
o Major features:
- If bridge authorities set BridgePassword, they will serve a
snapshot of known bridge routerstatuses from their DirPort to
anybody who knows that password. Unset by default.
o Minor bugfixes:
- Make the unit tests build again.
- Make "GETINFO/desc-annotations/id/<OR digest>" actually work.
- Make PublishServerDescriptor default to 1, so the default doesn't
have to change as we invent new directory protocol versions.
- Fix test for rlim_t on OSX 10.3: sys/resource.h doesn't want to
be included unless sys/time.h is already included. Fixes
bug 553. Bugfix on 0.2.0.x.
- If we receive a general-purpose descriptor and then receive an
identical bridge-purpose descriptor soon after, don't discard
the next one as a duplicate.
o Minor features:
- If BridgeRelay is set to 1, then the default for
PublishServerDescriptor is now "bridge" rather than "v2,v3".
- If the user sets RelayBandwidthRate but doesn't set
RelayBandwidthBurst, then make them equal rather than erroring out.
Changes in version 0.2.0.13-alpha - 2007-12-21
Tor 0.2.0.13-alpha adds a fourth v3 directory authority run by Geoff
Goodell, fixes many more bugs, and adds a lot of infrastructure for
upcoming features.
o New directory authorities:
- Set up lefkada (run by Geoff Goodell) as the fourth v3 directory
authority.
o Major bugfixes:
- Only update guard status (usable / not usable) once we have
enough directory information. This was causing us to always pick
two new guards on startup (bugfix on 0.2.0.9-alpha), and it was
causing us to discard all our guards on startup if we hadn't been
running for a few weeks (bugfix on 0.1.2.x). Fixes bug 448.
- Purge old entries from the "rephist" database and the hidden
service descriptor databases even when DirPort is zero. Bugfix
on 0.1.2.x.
- We were ignoring our RelayBandwidthRate for the first 30 seconds
after opening a circuit -- even a relayed circuit. Bugfix on
0.2.0.3-alpha.
- Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
crashing or mis-answering these types of requests.
- Relays were publishing their server descriptor to v1 and v2
directory authorities, but they didn't try publishing to v3-only
authorities. Fix this; and also stop publishing to v1 authorities.
Bugfix on 0.2.0.x.
- When we were reading router descriptors from cache, we were ignoring
the annotations -- so for example we were reading in bridge-purpose
descriptors as general-purpose descriptors. Bugfix on 0.2.0.8-alpha.
- When we decided to send a 503 response to a request for servers, we
were then also sending the server descriptors: this defeats the
whole purpose. Fixes bug 539; bugfix on 0.1.2.x.
o Major features:
- Bridge relays now behave like clients with respect to time
intervals for downloading new consensus documents -- otherwise they
stand out. Bridge users now wait until the end of the interval,
so their bridge relay will be sure to have a new consensus document.
- Three new config options (AlternateDirAuthority,
AlternateBridgeAuthority, and AlternateHSAuthority) that let the
user selectively replace the default directory authorities by type,
rather than the all-or-nothing replacement that DirServer offers.
- Tor can now be configured to read a GeoIP file from disk in one
of two formats. This can be used by controllers to map IP addresses
to countries. Eventually, it may support exit-by-country.
- When possible, bridge relays remember which countries users
are coming from, and report aggregate information in their
extra-info documents, so that the bridge authorities can learn
where Tor is blocked.
- Bridge directory authorities now do reachability testing on the
bridges they know. They provide router status summaries to the
controller via "getinfo ns/purpose/bridge", and also dump summaries
to a file periodically.
- Stop fetching directory info so aggressively if your DirPort is
on but your ORPort is off; stop fetching v2 dir info entirely.
You can override these choices with the new FetchDirInfoEarly
config option.
o Minor bugfixes:
- The fix in 0.2.0.12-alpha cleared the "hsdir" flag in v3 network
consensus documents when there are too many relays at a single
IP address. Now clear it in v2 network status documents too, and
also clear it in routerinfo_t when the relay is no longer listed
in the relevant networkstatus document.
- Don't crash if we get an unexpected value for the
PublishServerDescriptor config option. Reported by Matt Edman;
bugfix on 0.2.0.9-alpha.
- Our new v2 hidden service descriptor format allows descriptors
that have no introduction points. But Tor crashed when we tried
to build a descriptor with no intro points (and it would have
crashed if we had tried to parse one). Bugfix on 0.2.0.x; patch
by Karsten Loesing.
- Fix building with dmalloc 5.5.2 with glibc.
- Reject uploaded descriptors and extrainfo documents if they're
huge. Otherwise we'll cache them all over the network and it'll
clog everything up. Reported by Aljosha Judmayer.
- Check for presence of s6_addr16 and s6_addr32 fields in in6_addr
via autoconf. Should fix compile on solaris. Bugfix on 0.2.0.x.
- When the DANGEROUS_VERSION controller status event told us we're
running an obsolete version, it used the string "OLD" to describe
it. Yet the "getinfo" interface used the string "OBSOLETE". Now use
"OBSOLETE" in both cases. Bugfix on 0.1.2.x.
- If we can't expand our list of entry guards (e.g. because we're
using bridges or we have StrictEntryNodes set), don't mark relays
down when they fail a directory request. Otherwise we're too quick
to mark all our entry points down. Bugfix on 0.1.2.x.
- Fix handling of hex nicknames when answering controller requests for
networkstatus by name, or when deciding whether to warn about unknown
routers in a config option. Bugfix on 0.1.2.x. (Patch from mwenge.)
- Fix a couple of hard-to-trigger autoconf problems that could result
in really weird results on platforms whose sys/types.h files define
nonstandard integer types. Bugfix on 0.1.2.x.
- Fix compilation with --disable-threads set. Bugfix on 0.2.0.x.
- Don't crash on name lookup when we have no current consensus. Fixes
bug 538; bugfix on 0.2.0.x.
- Only Tors that want to mirror the v2 directory info should
create the "cached-status" directory in their datadir. (All Tors
used to create it.) Bugfix on 0.2.0.9-alpha.
- Directory authorities should only automatically download Extra Info
documents if they're v1, v2, or v3 authorities. Bugfix on 0.1.2.x.
o Minor features:
- On the USR1 signal, when dmalloc is in use, log the top 10 memory
consumers. (We already do this on HUP.)
- Authorities and caches fetch the v2 networkstatus documents
less often, now that v3 is encouraged.
- Add a new config option BridgeRelay that specifies you want to
be a bridge relay. Right now the only difference is that it makes
you answer begin_dir requests, and it makes you cache dir info,
even if your DirPort isn't on.
- Add "GETINFO/desc-annotations/id/<OR digest>" so controllers can
ask about source, timestamp of arrival, purpose, etc. We need
something like this to help Vidalia not do GeoIP lookups on bridge
addresses.
- Allow multiple HashedControlPassword config lines, to support
multiple controller passwords.
- Authorities now decide whether they're authoritative for a given
router based on the router's purpose.
- New config options AuthDirBadDir and AuthDirListBadDirs for
authorities to mark certain relays as "bad directories" in the
networkstatus documents. Also supports the "!baddir" directive in
the approved-routers file.
Changes in version 0.2.0.12-alpha - 2007-11-16
This twelfth development snapshot fixes some more build problems as
well as a few minor bugs.
o Compile fixes:
- Make it build on OpenBSD again. Patch from tup.
- Substitute BINDIR and LOCALSTATEDIR in scripts. Fixes
package-building for Red Hat, OS X, etc.
o Minor bugfixes (on 0.1.2.x):
- Changing the ExitPolicyRejectPrivate setting should cause us to
rebuild our server descriptor.
o Minor bugfixes (on 0.2.0.x):
- When we're lacking a consensus, don't try to perform rendezvous
operations. Reported by Karsten Loesing.
- Fix a small memory leak whenever we decide against using a
newly picked entry guard. Reported by Mike Perry.
- When authorities detected more than two relays running on the same
IP address, they were clearing all the status flags but forgetting
to clear the "hsdir" flag. So clients were being told that a
given relay was the right choice for a v2 hsdir lookup, yet they
never had its descriptor because it was marked as 'not running'
in the consensus.
- If we're trying to fetch a bridge descriptor and there's no way
the bridge authority could help us (for example, we don't know
a digest, or there is no bridge authority), don't be so eager to
fall back to asking the bridge authority.
- If we're using bridges or have strictentrynodes set, and our
chosen exit is in the same family as all our bridges/entry guards,
then be flexible about families.
o Minor features:
- When we negotiate a v2 link-layer connection (not yet implemented),
accept RELAY_EARLY cells and turn them into RELAY cells if we've
negotiated a v1 connection for their next step. Initial code for
proposal 110.
Changes in version 0.2.0.11-alpha - 2007-11-12
This eleventh development snapshot fixes some build problems with
the previous snapshot. It also includes a more secure-by-default exit
policy for relays, fixes an enormous memory leak for exit relays, and
fixes another bug where servers were falling out of the directory list.
o Security fixes:
- Exit policies now reject connections that are addressed to a
relay's public (external) IP address too, unless
ExitPolicyRejectPrivate is turned off. We do this because too
many relays are running nearby to services that trust them based
on network address. Bugfix on 0.1.2.x.
o Major bugfixes:
- Fix a memory leak on exit relays; we were leaking a cached_resolve_t
on every successful resolve. Reported by Mike Perry; bugfix
on 0.1.2.x.
- On authorities, never downgrade to old router descriptors simply
because they're listed in the consensus. This created a catch-22
where we wouldn't list a new descriptor because there was an
old one in the consensus, and we couldn't get the new one in the
consensus because we wouldn't list it. Possible fix for bug 548.
Also, this might cause bug 543 to appear on authorities; if so,
we'll need a band-aid for that. Bugfix on 0.2.0.9-alpha.
o Packaging fixes on 0.2.0.10-alpha:
- We were including instructions about what to do with the
src/config/fallback-consensus file, but we weren't actually
including it in the tarball. Disable all of that for now.
o Minor features:
- Allow people to say PreferTunnelledDirConns rather than
PreferTunneledDirConns, for those alternate-spellers out there.
o Minor bugfixes:
- Don't reevaluate all the information from our consensus document
just because we've downloaded a v2 networkstatus that we intend
to cache. Fixes bug 545; bugfix on 0.2.0.x.
Changes in version 0.2.0.10-alpha - 2007-11-10
This tenth development snapshot adds a third v3 directory authority
run by Mike Perry, adds most of Karsten Loesing's new hidden service
descriptor format, fixes a bad crash bug and new bridge bugs introduced
in 0.2.0.9-alpha, fixes many bugs with the v3 directory implementation,
fixes some minor memory leaks in previous 0.2.0.x snapshots, and
addresses many more minor issues.
o New directory authorities:
- Set up ides (run by Mike Perry) as the third v3 directory authority.
o Major features:
- Allow tunnelled directory connections to ask for an encrypted
"begin_dir" connection or an anonymized "uses a full Tor circuit"
connection independently. Now we can make anonymized begin_dir
connections for (e.g.) more secure hidden service posting and
fetching.
- More progress on proposal 114: code from Karsten Loesing to
implement new hidden service descriptor format.
- Raise the default BandwidthRate/BandwidthBurst to 5MB/10MB, to
accommodate the growing number of servers that use the default
and are reaching it.
- Directory authorities use a new formula for selecting which nodes
to advertise as Guards: they must be in the top 7/8 in terms of
how long we have known about them, and above the median of those
nodes in terms of weighted fractional uptime.
- Make "not enough dir info yet" warnings describe *why* Tor feels
it doesn't have enough directory info yet.
o Major bugfixes:
- Stop servers from crashing if they set a Family option (or
maybe in other situations too). Bugfix on 0.2.0.9-alpha; reported
by Fabian Keil.
- Make bridge users work again -- the move to v3 directories in
0.2.0.9-alpha had introduced a number of bugs that made bridges
no longer work for clients.
- When the clock jumps forward a lot, do not allow the bandwidth
buckets to become negative. Bugfix on 0.1.2.x; fixes bug 544.
o Major bugfixes (v3 dir, bugfixes on 0.2.0.9-alpha):
- When the consensus lists a router descriptor that we previously were
mirroring, but that we considered non-canonical, reload the
descriptor as canonical. This fixes bug 543 where Tor servers
would start complaining after a few days that they don't have
enough directory information to build a circuit.
- Consider replacing the current consensus when certificates arrive
that make the pending consensus valid. Previously, we were only
considering replacement when the new certs _didn't_ help.
- Fix an assert error on startup if we didn't already have the
consensus and certs cached in our datadirectory: we were caching
the consensus in consensus_waiting_for_certs but then free'ing it
right after.
- Avoid sending a request for "keys/fp" (for which we'll get a 400 Bad
Request) if we need more v3 certs but we've already got pending
requests for all of them.
- Correctly back off from failing certificate downloads. Fixes
bug 546.
- Authorities don't vote on the Running flag if they have been running
for less than 30 minutes themselves. Fixes bug 547, where a newly
started authority would vote that everyone was down.
o New requirements:
- Drop support for OpenSSL version 0.9.6. Just about nobody was using
it, it had no AES, and it hasn't seen any security patches since
2004.
o Minor features:
- Clients now hold circuitless TLS connections open for 1.5 times
MaxCircuitDirtiness (15 minutes), since it is likely that they'll
rebuild a new circuit over them within that timeframe. Previously,
they held them open only for KeepalivePeriod (5 minutes).
- Use "If-Modified-Since" to avoid retrieving consensus
networkstatuses that we already have.
- When we have no consensus, check FallbackNetworkstatusFile (defaults
to $PREFIX/share/tor/fallback-consensus) for a consensus. This way
we start knowing some directory caches.
- When we receive a consensus from the future, warn about skew.
- Improve skew reporting: try to give the user a better log message
about how skewed they are, and how much this matters.
- When we have a certificate for an authority, believe that
certificate's claims about the authority's IP address.
- New --quiet command-line option to suppress the default console log.
Good in combination with --hash-password.
- Authorities send back an X-Descriptor-Not-New header in response to
an accepted-but-discarded descriptor upload. Partially implements
fix for bug 535.
- Make the log message for "tls error. breaking." more useful.
- Better log messages about certificate downloads, to attempt to
track down the second incarnation of bug 546.
o Minor features (bridges):
- If bridge users set UpdateBridgesFromAuthority, but the digest
they ask for is a 404 from the bridge authority, they now fall
back to trying the bridge directly.
- Bridges now use begin_dir to publish their server descriptor to
the bridge authority, even when they haven't set TunnelDirConns.
o Minor features (controller):
- When reporting clock skew, and we know that the clock is _at least
as skewed_ as some value, but we don't know the actual value,
report the value as a "minimum skew."
o Utilities:
- Update linux-tor-prio.sh script to allow QoS based on the uid of
the Tor process. Patch from Marco Bonetti with tweaks from Mike
Perry.
o Minor bugfixes:
- Refuse to start if both ORPort and UseBridges are set. Bugfix
on 0.2.0.x, suggested by Matt Edman.
- Don't stop fetching descriptors when FetchUselessDescriptors is
set, even if we stop asking for circuits. Bugfix on 0.1.2.x;
reported by tup and ioerror.
- Better log message on vote from unknown authority.
- Don't log "Launching 0 request for 0 router" message.
o Minor bugfixes (memory leaks):
- Stop leaking memory every time we parse a v3 certificate. Bugfix
on 0.2.0.1-alpha.
- Stop leaking memory every time we load a v3 certificate. Bugfix
on 0.2.0.1-alpha. Fixes bug 536.
- Stop leaking a cached networkstatus on exit. Bugfix on
0.2.0.3-alpha.
- Stop leaking voter information every time we free a consensus.
Bugfix on 0.2.0.3-alpha.
- Stop leaking signed data every time we check a voter signature.
Bugfix on 0.2.0.3-alpha.
- Stop leaking a signature every time we fail to parse a consensus or
a vote. Bugfix on 0.2.0.3-alpha.
- Stop leaking v2_download_status_map on shutdown. Bugfix on
0.2.0.9-alpha.
- Stop leaking conn->nickname every time we make a connection to a
Tor relay without knowing its expected identity digest (e.g. when
using bridges). Bugfix on 0.2.0.3-alpha.
- Minor bugfixes (portability):
- Run correctly on platforms where rlim_t is larger than unsigned
long, and/or where the real limit for number of open files is
OPEN_FILES, not rlim_max from getrlimit(RLIMIT_NOFILES). In
particular, these may be needed for OS X 10.5.
Changes in version 0.1.2.18 - 2007-10-28
Tor 0.1.2.18 fixes many problems including crash bugs, problems with
hidden service introduction that were causing huge delays, and a big
bug that was causing some servers to disappear from the network status
lists for a few hours each day.
o Major bugfixes (crashes):
- If a connection is shut down abruptly because of something that
happened inside connection_flushed_some(), do not call
connection_finished_flushing(). Should fix bug 451:
"connection_stop_writing: Assertion conn->write_event failed"
Bugfix on 0.1.2.7-alpha.
- Fix possible segfaults in functions called from
rend_process_relay_cell().
o Major bugfixes (hidden services):
- Hidden services were choosing introduction points uniquely by
hexdigest, but when constructing the hidden service descriptor
they merely wrote the (potentially ambiguous) nickname.
- Clients now use the v2 intro format for hidden service
connections: they specify their chosen rendezvous point by identity
digest rather than by (potentially ambiguous) nickname. These
changes could speed up hidden service connections dramatically.
o Major bugfixes (other):
- Stop publishing a new server descriptor just because we get a
HUP signal. This led (in a roundabout way) to some servers getting
dropped from the networkstatus lists for a few hours each day.
- When looking for a circuit to cannibalize, consider family as well
as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
circuit cannibalization).
- When a router wasn't listed in a new networkstatus, we were leaving
the flags for that router alone -- meaning it remained Named,
Running, etc -- even though absence from the networkstatus means
that it shouldn't be considered to exist at all anymore. Now we
clear all the flags for routers that fall out of the networkstatus
consensus. Fixes bug 529.
o Minor bugfixes:
- Don't try to access (or alter) the state file when running
--list-fingerprint or --verify-config or --hash-password. Resolves
bug 499.
- When generating information telling us how to extend to a given
router, do not try to include the nickname if it is
absent. Resolves bug 467.
- Fix a user-triggerable segfault in expand_filename(). (There isn't
a way to trigger this remotely.)
- When sending a status event to the controller telling it that an
OR address is reachable, set the port correctly. (Previously we
were reporting the dir port.)
- Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
command. Bugfix on 0.1.2.17.
- When loading bandwidth history, do not believe any information in
the future. Fixes bug 434.
- When loading entry guard information, do not believe any information
in the future.
- When we have our clock set far in the future and generate an
onion key, then re-set our clock to be correct, we should not stop
the onion key from getting rotated.
- On some platforms, accept() can return a broken address. Detect
this more quietly, and deal accordingly. Fixes bug 483.
- It's not actually an error to find a non-pending entry in the DNS
cache when canceling a pending resolve. Don't log unless stuff
is fishy. Resolves bug 463.
- Don't reset trusted dir server list when we set a configuration
option. Patch from Robert Hogan.
- Don't try to create the datadir when running --verify-config or
--hash-password. Resolves bug 540.
Changes in version 0.2.0.9-alpha - 2007-10-24
This ninth development snapshot switches clients to the new v3 directory
system; allows servers to be listed in the network status even when they
have the same nickname as a registered server; and fixes many other
bugs including a big one that was causing some servers to disappear
from the network status lists for a few hours each day.
o Major features (directory system):
- Clients now download v3 consensus networkstatus documents instead
of v2 networkstatus documents. Clients and caches now base their
opinions about routers on these consensus documents. Clients only
download router descriptors listed in the consensus.
- Authorities now list servers who have the same nickname as
a different named server, but list them with a new flag,
"Unnamed". Now we can list servers that happen to pick the same
nickname as a server that registered two years ago and then
disappeared. Partially implements proposal 122.
- If the consensus lists a router as "Unnamed", the name is assigned
to a different router: do not identify the router by that name.
Partially implements proposal 122.
- Authorities can now come to a consensus on which method to use to
compute the consensus. This gives us forward compatibility.
o Major bugfixes:
- Stop publishing a new server descriptor just because we HUP or
when we find our DirPort to be reachable but won't actually publish
it. New descriptors without any real changes are dropped by the
authorities, and can screw up our "publish every 18 hours" schedule.
Bugfix on 0.1.2.x.
- When a router wasn't listed in a new networkstatus, we were leaving
the flags for that router alone -- meaning it remained Named,
Running, etc -- even though absence from the networkstatus means
that it shouldn't be considered to exist at all anymore. Now we
clear all the flags for routers that fall out of the networkstatus
consensus. Fixes bug 529; bugfix on 0.1.2.x.
- Fix awful behavior in DownloadExtraInfo option where we'd fetch
extrainfo documents and then discard them immediately for not
matching the latest router. Bugfix on 0.2.0.1-alpha.
o Minor features (v3 directory protocol):
- Allow tor-gencert to generate a new certificate without replacing
the signing key.
- Allow certificates to include an address.
- When we change our directory-cache settings, reschedule all voting
and download operations.
- Reattempt certificate downloads immediately on failure, as long as
we haven't failed a threshold number of times yet.
- Delay retrying consensus downloads while we're downloading
certificates to verify the one we just got. Also, count getting a
consensus that we already have (or one that isn't valid) as a failure,
and count failing to get the certificates after 20 minutes as a
failure.
- Build circuits and download descriptors even if our consensus is a
little expired. (This feature will go away once authorities are
more reliable.)
o Minor features (router descriptor cache):
- If we find a cached-routers file that's been sitting around for more
than 28 days unmodified, then most likely it's a leftover from
when we upgraded to 0.2.0.8-alpha. Remove it. It has no good
routers anyway.
- When we (as a cache) download a descriptor because it was listed
in a consensus, remember when the consensus was supposed to expire,
and don't expire the descriptor until then.
o Minor features (performance):
- Call routerlist_remove_old_routers() much less often. This should
speed startup, especially on directory caches.
- Don't try to launch new descriptor downloads quite so often when we
already have enough directory information to build circuits.
- Base64 decoding was actually showing up on our profile when parsing
the initial descriptor file; switch to an in-process all-at-once
implementation that's about 3.5x times faster than calling out to
OpenSSL.
o Minor features (compilation):
- Detect non-ASCII platforms (if any still exist) and refuse to
build there: some of our code assumes that 'A' is 65 and so on.
o Minor bugfixes (v3 directory authorities, bugfixes on 0.2.0.x):
- Make the "next period" votes into "current period" votes immediately
after publishing the consensus; avoid a heisenbug that made them
stick around indefinitely.
- When we discard a vote as a duplicate, do not report this as
an error.
- Treat missing v3 keys or certificates as an error when running as a
v3 directory authority.
- When we're configured to be a v3 authority, but we're only listed
as a non-v3 authority in our DirServer line for ourself, correct
the listing.
- If an authority doesn't have a qualified hostname, just put
its address in the vote. This fixes the problem where we referred to
"moria on moria:9031."
- Distinguish between detached signatures for the wrong period, and
detached signatures for a divergent vote.
- Fix a small memory leak when computing a consensus.
- When there's no consensus, we were forming a vote every 30
minutes, but writing the "valid-after" line in our vote based
on our configured V3AuthVotingInterval: so unless the intervals
matched up, we immediately rejected our own vote because it didn't
start at the voting interval that caused us to construct a vote.
o Minor bugfixes (v3 directory protocol, bugfixes on 0.2.0.x):
- Delete unverified-consensus when the real consensus is set.
- Consider retrying a consensus networkstatus fetch immediately
after one fails: don't wait 60 seconds to notice.
- When fetching a consensus as a cache, wait until a newer consensus
should exist before trying to replace the current one.
- Use a more forgiving schedule for retrying failed consensus
downloads than for other types.
o Minor bugfixes (other directory issues):
- Correct the implementation of "download votes by digest." Bugfix on
0.2.0.8-alpha.
- Authorities no longer send back "400 you're unreachable please fix
it" errors to Tor servers that aren't online all the time. We're
supposed to tolerate these servers now. Bugfix on 0.1.2.x.
o Minor bugfixes (controller):
- Don't reset trusted dir server list when we set a configuration
option. Patch from Robert Hogan; bugfix on 0.1.2.x.
- Respond to INT and TERM SIGNAL commands before we execute the
signal, in case the signal shuts us down. We had a patch in
0.1.2.1-alpha that tried to do this by queueing the response on
the connection's buffer before shutting down, but that really
isn't the same thing at all. Bug located by Matt Edman.
o Minor bugfixes (misc):
- Correctly check for bad options to the "PublishServerDescriptor"
config option. Bugfix on 0.2.0.1-alpha; reported by Matt Edman.
- Stop leaking memory on failing case of base32_decode, and make
it accept upper-case letters. Bugfixes on 0.2.0.7-alpha.
- Don't try to download extrainfo documents when we're trying to
fetch enough directory info to build a circuit: having enough
info should get priority. Bugfix on 0.2.0.x.
- Don't complain that "your server has not managed to confirm that its
ports are reachable" if we haven't been able to build any circuits
yet. Bug found by spending four hours without a v3 consensus. Bugfix
on 0.1.2.x.
- Detect the reason for failing to mmap a descriptor file we just
wrote, and give a more useful log message. Fixes bug 533. Bugfix
on 0.1.2.x.
o Code simplifications and refactoring:
- Remove support for the old bw_accounting file: we've been storing
bandwidth accounting information in the state file since
0.1.2.5-alpha. This may result in bandwidth accounting errors
if you try to upgrade from 0.1.1.x or earlier, or if you try to
downgrade to 0.1.1.x or earlier.
- New convenience code to locate a file within the DataDirectory.
- Move non-authority functionality out of dirvote.c.
- Refactor the arguments for router_pick_{directory_|trusteddir}server
so that they all take the same named flags.
o Utilities
- Include the "tor-ctrl.sh" bash script by Stefan Behte to provide
Unix users an easy way to script their Tor process (e.g. by
adjusting bandwidth based on the time of the day).
Changes in version 0.2.0.8-alpha - 2007-10-12
This eighth development snapshot fixes a crash bug that's been bothering
us since February 2007, lets bridge authorities store a list of bridge
descriptors they've seen, gets v3 directory voting closer to working,
starts caching v3 directory consensus documents on directory mirrors,
and fixes a variety of smaller issues including some minor memory leaks.
o Major features (router descriptor cache):
- Store routers in a file called cached-descriptors instead of in
cached-routers. Initialize cached-descriptors from cached-routers
if the old format is around. The new format allows us to store
annotations along with descriptors.
- Use annotations to record the time we received each descriptor, its
source, and its purpose.
- Disable the SETROUTERPURPOSE controller command: it is now
obsolete.
- Controllers should now specify cache=no or cache=yes when using
the +POSTDESCRIPTOR command.
- Bridge authorities now write bridge descriptors to disk, meaning
we can export them to other programs and begin distributing them
to blocked users.
o Major features (directory authorities):
- When a v3 authority is missing votes or signatures, it now tries
to fetch them.
- Directory authorities track weighted fractional uptime as well as
weighted mean-time-between failures. WFU is suitable for deciding
whether a node is "usually up", while MTBF is suitable for deciding
whether a node is "likely to stay up." We need both, because
"usually up" is a good requirement for guards, while "likely to
stay up" is a good requirement for long-lived connections.
o Major features (v3 directory system):
- Caches now download v3 network status documents as needed,
and download the descriptors listed in them.
- All hosts now attempt to download and keep fresh v3 authority
certificates, and re-attempt after failures.
- More internal-consistency checks for vote parsing.
o Major bugfixes (crashes):
- If a connection is shut down abruptly because of something that
happened inside connection_flushed_some(), do not call
connection_finished_flushing(). Should fix bug 451. Bugfix on
0.1.2.7-alpha.
o Major bugfixes (performance):
- Fix really bad O(n^2) performance when parsing a long list of
routers: Instead of searching the entire list for an "extra-info "
string which usually wasn't there, once for every routerinfo
we read, just scan lines forward until we find one we like.
Bugfix on 0.2.0.1.
- When we add data to a write buffer in response to the data on that
write buffer getting low because of a flush, do not consider the
newly added data as a candidate for immediate flushing, but rather
make it wait until the next round of writing. Otherwise, we flush
and refill recursively, and a single greedy TLS connection can
eat all of our bandwidth. Bugfix on 0.1.2.7-alpha.
o Minor features (v3 authority system):
- Add more ways for tools to download the votes that lead to the
current consensus.
- Send a 503 when low on bandwidth and a vote, consensus, or
certificate is requested.
- If-modified-since is now implemented properly for all kinds of
certificate requests.
o Minor bugfixes (network statuses):
- Tweak the implementation of proposal 109 slightly: allow at most
two Tor servers on the same IP address, except if it's the location
of a directory authority, in which case allow five. Bugfix on
0.2.0.3-alpha.
o Minor bugfixes (controller):
- When sending a status event to the controller telling it that an
OR address is reachable, set the port correctly. (Previously we
were reporting the dir port.) Bugfix on 0.1.2.x.
o Minor bugfixes (v3 directory system):
- Fix logic to look up a cert by its signing key digest. Bugfix on
0.2.0.7-alpha.
- Only change the reply to a vote to "OK" if it's not already
set. This gets rid of annoying "400 OK" log messages, which may
have been masking some deeper issue. Bugfix on 0.2.0.7-alpha.
- When we get a valid consensus, recompute the voting schedule.
- Base the valid-after time of a vote on the consensus voting
schedule, not on our preferred schedule.
- Make the return values and messages from signature uploads and
downloads more sensible.
- Fix a memory leak when serving votes and consensus documents, and
another when serving certificates.
o Minor bugfixes (performance):
- Use a slightly simpler string hashing algorithm (copying Python's
instead of Java's) and optimize our digest hashing algorithm to take
advantage of 64-bit platforms and to remove some possibly-costly
voodoo.
- Fix a minor memory leak whenever we parse guards from our state
file. Bugfix on 0.2.0.7-alpha.
- Fix a minor memory leak whenever we write out a file. Bugfix on
0.2.0.7-alpha.
- Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
command. Bugfix on 0.2.0.5-alpha.
o Minor bugfixes (portability):
- On some platforms, accept() can return a broken address. Detect
this more quietly, and deal accordingly. Fixes bug 483.
- Stop calling tor_strlower() on uninitialized memory in some cases.
Bugfix in 0.2.0.7-alpha.
o Minor bugfixes (usability):
- Treat some 403 responses from directory servers as INFO rather than
WARN-severity events.
- It's not actually an error to find a non-pending entry in the DNS
cache when canceling a pending resolve. Don't log unless stuff is
fishy. Resolves bug 463.
o Minor bugfixes (anonymity):
- Never report that we've used more bandwidth than we're willing to
relay: it leaks how much non-relay traffic we're using. Resolves
bug 516.
- When looking for a circuit to cannibalize, consider family as well
as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
circuit cannibalization).
o Code simplifications and refactoring:
- Make a bunch of functions static. Remove some dead code.
- Pull out about a third of the really big routerlist.c; put it in a
new module, networkstatus.c.
- Merge the extra fields in local_routerstatus_t back into
routerstatus_t: we used to need one routerstatus_t for each
authority's opinion, plus a local_routerstatus_t for the locally
computed consensus opinion. To save space, we put the locally
modified fields into local_routerstatus_t, and only the common
stuff into routerstatus_t. But once v3 directories are in use,
clients and caches will no longer need to hold authority opinions;
thus, the rationale for keeping the types separate is now gone.
- Make the code used to reschedule and reattempt downloads more
uniform.
- Turn all 'Are we a directory server/mirror?' logic into a call to
dirserver_mode().
- Remove the code to generate the oldest (v1) directory format.
The code has been disabled since 0.2.0.5-alpha.
Changes in version 0.2.0.7-alpha - 2007-09-21
This seventh development snapshot makes bridges work again, makes bridge
authorities work for the first time, fixes two huge performance flaws
in hidden services, and fixes a variety of minor issues.
o New directory authorities:
- Set up moria1 and tor26 as the first v3 directory authorities. See
doc/spec/dir-spec.txt for details on the new directory design.
o Major bugfixes (crashes):
- Fix possible segfaults in functions called from
rend_process_relay_cell(). Bugfix on 0.1.2.x.
o Major bugfixes (bridges):
- Fix a bug that made servers send a "404 Not found" in response to
attempts to fetch their server descriptor. This caused Tor servers
to take many minutes to establish reachability for their DirPort,
and it totally crippled bridges. Bugfix on 0.2.0.5-alpha.
- Make "UpdateBridgesFromAuthority" torrc option work: when bridge
users configure that and specify a bridge with an identity
fingerprint, now they will lookup the bridge descriptor at the
default bridge authority via a one-hop tunnel, but once circuits
are established they will switch to a three-hop tunnel for later
connections to the bridge authority. Bugfix in 0.2.0.3-alpha.
o Major bugfixes (hidden services):
- Hidden services were choosing introduction points uniquely by
hexdigest, but when constructing the hidden service descriptor
they merely wrote the (potentially ambiguous) nickname.
- Clients now use the v2 intro format for hidden service
connections: they specify their chosen rendezvous point by identity
digest rather than by (potentially ambiguous) nickname. Both
are bugfixes on 0.1.2.x, and they could speed up hidden service
connections dramatically. Thanks to Karsten Loesing.
o Minor features (security):
- As a client, do not believe any server that tells us that an
address maps to an internal address space.
- Make it possible to enable HashedControlPassword and
CookieAuthentication at the same time.
o Minor features (guard nodes):
- Tag every guard node in our state file with the version that
we believe added it, or with our own version if we add it. This way,
if a user temporarily runs an old version of Tor and then switches
back to a new one, she doesn't automatically lose her guards.
o Minor features (speed):
- When implementing AES counter mode, update only the portions of the
counter buffer that need to change, and don't keep separate
network-order and host-order counters when they are the same (i.e.,
on big-endian hosts.)
o Minor features (controller):
- Accept LF instead of CRLF on controller, since some software has a
hard time generating real Internet newlines.
- Add GETINFO values for the server status events
"REACHABILITY_SUCCEEDED" and "GOOD_SERVER_DESCRIPTOR". Patch from
Robert Hogan.
o Removed features:
- Routers no longer include bandwidth-history lines in their
descriptors; this information is already available in extra-info
documents, and including it in router descriptors took up 60%
(!) of compressed router descriptor downloads. Completes
implementation of proposal 104.
- Remove the contrib scripts ExerciseServer.py, PathDemo.py,
and TorControl.py, as they use the old v0 controller protocol,
and are obsoleted by TorFlow anyway.
- Drop support for v1 rendezvous descriptors, since we never used
them anyway, and the code has probably rotted by now. Based on
patch from Karsten Loesing.
- On OSX, stop warning the user that kqueue support in libevent is
"experimental", since it seems to have worked fine for ages.
o Minor bugfixes:
- When generating information telling us how to extend to a given
router, do not try to include the nickname if it is absent. Fixes
bug 467. Bugfix on 0.2.0.3-alpha.
- Fix a user-triggerable (but not remotely-triggerable) segfault
in expand_filename(). Bugfix on 0.1.2.x.
- Fix a memory leak when freeing incomplete requests from DNSPort.
Found by Niels Provos with valgrind. Bugfix on 0.2.0.1-alpha.
- Don't try to access (or alter) the state file when running
--list-fingerprint or --verify-config or --hash-password. (Resolves
bug 499.) Bugfix on 0.1.2.x.
- Servers used to decline to publish their DirPort if their
BandwidthRate, RelayBandwidthRate, or MaxAdvertisedBandwidth
were below a threshold. Now they only look at BandwidthRate and
RelayBandwidthRate. Bugfix on 0.1.2.x.
- Remove an optimization in the AES counter-mode code that assumed
that the counter never exceeded 2^68. When the counter can be set
arbitrarily as an IV (as it is by Karsten's new hidden services
code), this assumption no longer holds. Bugfix on 0.1.2.x.
- Resume listing "AUTHORITY" flag for authorities in network status.
Bugfix on 0.2.0.3-alpha; reported by Alex de Joode.
o Code simplifications and refactoring:
- Revamp file-writing logic so we don't need to have the entire
contents of a file in memory at once before we write to disk. Tor,
meet stdio.
- Turn "descriptor store" into a full-fledged type.
- Move all NT services code into a separate source file.
- Unify all code that computes medians, percentile elements, etc.
- Get rid of a needless malloc when parsing address policies.
Changes in version 0.1.2.17 - 2007-08-30
Tor 0.1.2.17 features a new Vidalia version in the Windows and OS
X bundles. Vidalia 0.0.14 makes authentication required for the
ControlPort in the default configuration, which addresses important
security risks. Everybody who uses Vidalia (or another controller)
should upgrade.
In addition, this Tor update fixes major load balancing problems with
path selection, which should speed things up a lot once many people
have upgraded.
o Major bugfixes (security):
- We removed support for the old (v0) control protocol. It has been
deprecated since Tor 0.1.1.1-alpha, and keeping it secure has
become more of a headache than it's worth.
o Major bugfixes (load balancing):
- When choosing nodes for non-guard positions, weight guards
proportionally less, since they already have enough load. Patch
from Mike Perry.
- Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
will allow fast Tor servers to get more attention.
- When we're upgrading from an old Tor version, forget our current
guards and pick new ones according to the new weightings. These
three load balancing patches could raise effective network capacity
by a factor of four. Thanks to Mike Perry for measurements.
o Major bugfixes (stream expiration):
- Expire not-yet-successful application streams in all cases if
they've been around longer than SocksTimeout. Right now there are
some cases where the stream will live forever, demanding a new
circuit every 15 seconds. Fixes bug 454; reported by lodger.
o Minor features (controller):
- Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
is valid before any authentication has been received. It tells
a controller what kind of authentication is expected, and what
protocol is spoken. Implements proposal 119.
o Minor bugfixes (performance):
- Save on most routerlist_assert_ok() calls in routerlist.c, thus
greatly speeding up loading cached-routers from disk on startup.
- Disable sentinel-based debugging for buffer code: we squashed all
the bugs that this was supposed to detect a long time ago, and now
its only effect is to change our buffer sizes from nice powers of
two (which platform mallocs tend to like) to values slightly over
powers of two (which make some platform mallocs sad).
o Minor bugfixes (misc):
- If exit bandwidth ever exceeds one third of total bandwidth, then
use the correct formula to weight exit nodes when choosing paths.
Based on patch from Mike Perry.
- Choose perfectly fairly among routers when choosing by bandwidth and
weighting by fraction of bandwidth provided by exits. Previously, we
would choose with only approximate fairness, and correct ourselves
if we ran off the end of the list.
- If we require CookieAuthentication but we fail to write the
cookie file, we would warn but not exit, and end up in a state
where no controller could authenticate. Now we exit.
- If we require CookieAuthentication, stop generating a new cookie
every time we change any piece of our config.
- Refuse to start with certain directory authority keys, and
encourage people using them to stop.
- Terminate multi-line control events properly. Original patch
from tup.
- Fix a minor memory leak when we fail to find enough suitable
servers to choose a circuit.
- Stop leaking part of the descriptor when we run into a particularly
unparseable piece of it.
Changes in version 0.2.0.6-alpha - 2007-08-26
This sixth development snapshot features a new Vidalia version in the
Windows and OS X bundles. Vidalia 0.0.14 makes authentication required for
the ControlPort in the default configuration, which addresses important
security risks.
In addition, this snapshot fixes major load balancing problems
with path selection, which should speed things up a lot once many
people have upgraded. The directory authorities also use a new
mean-time-between-failure approach to tracking which servers are stable,
rather than just looking at the most recent uptime.
o New directory authorities:
- Set up Tonga as the default bridge directory authority.
o Major features:
- Directory authorities now track servers by weighted
mean-times-between-failures. When we have 4 or more days of data,
use measured MTBF rather than declared uptime to decide whether
to call a router Stable. Implements proposal 108.
o Major bugfixes (load balancing):
- When choosing nodes for non-guard positions, weight guards
proportionally less, since they already have enough load. Patch
from Mike Perry.
- Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
will allow fast Tor servers to get more attention.
- When we're upgrading from an old Tor version, forget our current
guards and pick new ones according to the new weightings. These
three load balancing patches could raise effective network capacity
by a factor of four. Thanks to Mike Perry for measurements.
o Major bugfixes (descriptor parsing):
- Handle unexpected whitespace better in malformed descriptors. Bug
found using Benedikt Boss's new Tor fuzzer! Bugfix on 0.2.0.x.
o Minor features:
- There is now an ugly, temporary "desc/all-recent-extrainfo-hack"
GETINFO for Torstat to use until it can switch to using extrainfos.
- Optionally (if built with -DEXPORTMALLINFO) export the output
of mallinfo via http, as tor/mallinfo.txt. Only accessible
from localhost.
o Minor bugfixes:
- Do not intermix bridge routers with controller-added
routers. (Bugfix on 0.2.0.x)
- Do not fail with an assert when accept() returns an unexpected
address family. Addresses but does not wholly fix bug 483. (Bugfix
on 0.2.0.x)
- Let directory authorities startup even when they can't generate
a descriptor immediately, e.g. because they don't know their
address.
- Stop putting the authentication cookie in a file called "0"
in your working directory if you don't specify anything for the
new CookieAuthFile option. Reported by Matt Edman.
- Make it possible to read the PROTOCOLINFO response in a way that
conforms to our control-spec. Reported by Matt Edman.
- Fix a minor memory leak when we fail to find enough suitable
servers to choose a circuit. Bugfix on 0.1.2.x.
- Stop leaking part of the descriptor when we run into a particularly
unparseable piece of it. Bugfix on 0.1.2.x.
- Unmap the extrainfo cache file on exit.
Changes in version 0.2.0.5-alpha - 2007-08-19
This fifth development snapshot fixes compilation on Windows again;
fixes an obnoxious client-side bug that slowed things down and put
extra load on the network; gets us closer to using the v3 directory
voting scheme; makes it easier for Tor controllers to use cookie-based
authentication; and fixes a variety of other bugs.
o Removed features:
- Version 1 directories are no longer generated in full. Instead,
authorities generate and serve "stub" v1 directories that list
no servers. This will stop Tor versions 0.1.0.x and earlier from
working, but (for security reasons) nobody should be running those
versions anyway.
o Major bugfixes (compilation, 0.2.0.x):
- Try to fix Win32 compilation again: improve checking for IPv6 types.
- Try to fix MSVC compilation: build correctly on platforms that do
not define s6_addr16 or s6_addr32.
- Fix compile on platforms without getaddrinfo: bug found by Li-Hui
Zhou.
o Major bugfixes (stream expiration):
- Expire not-yet-successful application streams in all cases if
they've been around longer than SocksTimeout. Right now there are
some cases where the stream will live forever, demanding a new
circuit every 15 seconds. Bugfix on 0.1.2.7-alpha; fixes bug 454;
reported by lodger.
o Minor features (directory servers):
- When somebody requests a list of statuses or servers, and we have
none of those, return a 404 rather than an empty 200.
o Minor features (directory voting):
- Store v3 consensus status consensuses on disk, and reload them
on startup.
o Minor features (security):
- Warn about unsafe ControlPort configurations.
- Refuse to start with certain directory authority keys, and
encourage people using them to stop.
o Minor features (controller):
- Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
is valid before any authentication has been received. It tells
a controller what kind of authentication is expected, and what
protocol is spoken. Implements proposal 119.
- New config option CookieAuthFile to choose a new location for the
cookie authentication file, and config option
CookieAuthFileGroupReadable to make it group-readable.
o Minor features (unit testing):
- Add command-line arguments to unit-test executable so that we can
invoke any chosen test from the command line rather than having
to run the whole test suite at once; and so that we can turn on
logging for the unit tests.
o Minor bugfixes (on 0.1.2.x):
- If we require CookieAuthentication but we fail to write the
cookie file, we would warn but not exit, and end up in a state
where no controller could authenticate. Now we exit.
- If we require CookieAuthentication, stop generating a new cookie
every time we change any piece of our config.
- When loading bandwidth history, do not believe any information in
the future. Fixes bug 434.
- When loading entry guard information, do not believe any information
in the future.
- When we have our clock set far in the future and generate an
onion key, then re-set our clock to be correct, we should not stop
the onion key from getting rotated.
- Clean up torrc sample config file.
- Do not automatically run configure from autogen.sh. This
non-standard behavior tended to annoy people who have built other
programs.
o Minor bugfixes (on 0.2.0.x):
- Fix a bug with AutomapHostsOnResolve that would always cause
the second request to fail. Bug reported by Kate. Bugfix on
0.2.0.3-alpha.
- Fix a bug in ADDRMAP controller replies that would sometimes
try to print a NULL. Patch from tup.
- Read v3 directory authority keys from the right location.
- Numerous bugfixes to directory voting code.
Changes in version 0.1.2.16 - 2007-08-01
Tor 0.1.2.16 fixes a critical security vulnerability that allows a
remote attacker in certain situations to rewrite the user's torrc
configuration file. This can completely compromise anonymity of users
in most configurations, including those running the Vidalia bundles,
TorK, etc. Or worse.
o Major security fixes:
- Close immediately after missing authentication on control port;
do not allow multiple authentication attempts.
Changes in version 0.2.0.4-alpha - 2007-08-01
This fourth development snapshot fixes a critical security vulnerability
for most users, specifically those running Vidalia, TorK, etc. Everybody
should upgrade to either 0.1.2.16 or 0.2.0.4-alpha.
o Major security fixes:
- Close immediately after missing authentication on control port;
do not allow multiple authentication attempts.
o Major bugfixes (compilation):
- Fix win32 compilation: apparently IN_ADDR and IN6_ADDR are already
defined there.
o Minor features (performance):
- Be even more aggressive about releasing RAM from small
empty buffers. Thanks to our free-list code, this shouldn't be too
performance-intensive.
- Disable sentinel-based debugging for buffer code: we squashed all
the bugs that this was supposed to detect a long time ago, and
now its only effect is to change our buffer sizes from nice
powers of two (which platform mallocs tend to like) to values
slightly over powers of two (which make some platform mallocs sad).
- Log malloc statistics from mallinfo() on platforms where it
exists.
Changes in version 0.2.0.3-alpha - 2007-07-29
This third development snapshot introduces new experimental
blocking-resistance features and a preliminary version of the v3
directory voting design, and includes many other smaller features
and bugfixes.
o Major features:
- The first pieces of our "bridge" design for blocking-resistance
are implemented. People can run bridge directory authorities;
people can run bridges; and people can configure their Tor clients
with a set of bridges to use as the first hop into the Tor network.
See http://archives.seul.org/or/talk/Jul-2007/msg00249.html for
details.
- Create listener connections before we setuid to the configured
User and Group. Now non-Windows users can choose port values
under 1024, start Tor as root, and have Tor bind those ports
before it changes to another UID. (Windows users could already
pick these ports.)
- Added a new ConstrainedSockets config option to set SO_SNDBUF and
SO_RCVBUF on TCP sockets. Hopefully useful for Tor servers running
on "vserver" accounts. (Patch from coderman.)
- Be even more aggressive about separating local traffic from relayed
traffic when RelayBandwidthRate is set. (Refines proposal 111.)
o Major features (experimental):
- First cut of code for "v3 dir voting": directory authorities will
vote on a common network status document rather than each publishing
their own opinion. This code needs more testing and more corner-case
handling before it's ready for use.
o Security fixes:
- Directory authorities now call routers Fast if their bandwidth is
at least 100KB/s, and consider their bandwidth adequate to be a
Guard if it is at least 250KB/s, no matter the medians. This fix
complements proposal 107. [Bugfix on 0.1.2.x]
- Directory authorities now never mark more than 3 servers per IP as
Valid and Running. (Implements proposal 109, by Kevin Bauer and
Damon McCoy.)
- Minor change to organizationName and commonName generation
procedures in TLS certificates during Tor handshakes, to invalidate
some earlier censorware approaches. This is not a long-term
solution, but applying it will give us a bit of time to look into
the epidemiology of countermeasures as they spread.
o Major bugfixes (directory):
- Rewrite directory tokenization code to never run off the end of
a string. Fixes bug 455. Patch from croup. [Bugfix on 0.1.2.x]
o Minor features (controller):
- Add a SOURCE_ADDR field to STREAM NEW events so that controllers can
match requests to applications. (Patch from Robert Hogan.)
- Report address and port correctly on connections to DNSPort. (Patch
from Robert Hogan.)
- Add a RESOLVE command to launch hostname lookups. (Original patch
from Robert Hogan.)
- Add GETINFO status/enough-dir-info to let controllers tell whether
Tor has downloaded sufficient directory information. (Patch
from Tup.)
- You can now use the ControlSocket option to tell Tor to listen for
controller connections on Unix domain sockets on systems that
support them. (Patch from Peter Palfrader.)
- STREAM NEW events are generated for DNSPort requests and for
tunneled directory connections. (Patch from Robert Hogan.)
- New "GETINFO address-mappings/*" command to get address mappings
with expiry information. "addr-mappings/*" is now deprecated.
(Patch from Tup.)
o Minor features (misc):
- Merge in some (as-yet-unused) IPv6 address manipulation code. (Patch
from croup.)
- The tor-gencert tool for v3 directory authorities now creates all
files as readable to the file creator only, and write-protects
the authority identity key.
- When dumping memory usage, list bytes used in buffer memory
free-lists.
- When running with dmalloc, dump more stats on hup and on exit.
- Directory authorities now fail quickly and (relatively) harmlessly
if they generate a network status document that is somehow
malformed.
o Traffic load balancing improvements:
- If exit bandwidth ever exceeds one third of total bandwidth, then
use the correct formula to weight exit nodes when choosing paths.
(Based on patch from Mike Perry.)
- Choose perfectly fairly among routers when choosing by bandwidth and
weighting by fraction of bandwidth provided by exits. Previously, we
would choose with only approximate fairness, and correct ourselves
if we ran off the end of the list. [Bugfix on 0.1.2.x]
o Performance improvements:
- Be more aggressive with freeing buffer RAM or putting it on the
memory free lists.
- Use Critical Sections rather than Mutexes for synchronizing threads
on win32; Mutexes are heavier-weight, and designed for synchronizing
between processes.
o Deprecated and removed features:
- RedirectExits is now deprecated.
- Stop allowing address masks that do not correspond to bit prefixes.
We have warned about these for a really long time; now it's time
to reject them. (Patch from croup.)
o Minor bugfixes (directory):
- Fix another crash bug related to extra-info caching. (Bug found by
Peter Palfrader.) [Bugfix on 0.2.0.2-alpha]
- Directories no longer return a "304 not modified" when they don't
have the networkstatus the client asked for. Also fix a memory
leak when returning 304 not modified. [Bugfixes on 0.2.0.2-alpha]
- We had accidentally labelled 0.1.2.x directory servers as not
suitable for begin_dir requests, and had labelled no directory
servers as suitable for uploading extra-info documents. [Bugfix
on 0.2.0.1-alpha]
o Minor bugfixes (dns):
- Fix a crash when DNSPort is set more than once. (Patch from Robert
Hogan.) [Bugfix on 0.2.0.2-alpha]
- Add DNSPort connections to the global connection list, so that we
can time them out correctly. (Bug found by Robert Hogan.) [Bugfix
on 0.2.0.2-alpha]
- Fix a dangling reference that could lead to a crash when DNSPort is
changed or closed (Patch from Robert Hogan.) [Bugfix on
0.2.0.2-alpha]
o Minor bugfixes (controller):
- Provide DNS expiry times in GMT, not in local time. For backward
compatibility, ADDRMAP events only provide GMT expiry in an extended
field. "GETINFO address-mappings" always does the right thing.
- Use CRLF line endings properly in NS events.
- Terminate multi-line control events properly. (Original patch
from tup.) [Bugfix on 0.1.2.x-alpha]
- Do not include spaces in SOURCE_ADDR fields in STREAM
events. Resolves bug 472. [Bugfix on 0.2.0.x-alpha]
Changes in version 0.1.2.15 - 2007-07-17
Tor 0.1.2.15 fixes several crash bugs, fixes some anonymity-related
problems, fixes compilation on BSD, and fixes a variety of other
bugs. Everybody should upgrade.
o Major bugfixes (compilation):
- Fix compile on FreeBSD/NetBSD/OpenBSD. Oops.
o Major bugfixes (crashes):
- Try even harder not to dereference the first character after
an mmap(). Reported by lodger.
- Fix a crash bug in directory authorities when we re-number the
routerlist while inserting a new router.
- When the cached-routers file is an even multiple of the page size,
don't run off the end and crash. (Fixes bug 455; based on idea
from croup.)
- Fix eventdns.c behavior on Solaris: It is critical to include
orconfig.h _before_ sys/types.h, so that we can get the expected
definition of _FILE_OFFSET_BITS.
o Major bugfixes (security):
- Fix a possible buffer overrun when using BSD natd support. Bug
found by croup.
- When sending destroy cells from a circuit's origin, don't include
the reason for tearing down the circuit. The spec says we didn't,
and now we actually don't. Reported by lodger.
- Keep streamids from different exits on a circuit separate. This
bug may have allowed other routers on a given circuit to inject
cells into streams. Reported by lodger; fixes bug 446.
- If there's a never-before-connected-to guard node in our list,
never choose any guards past it. This way we don't expand our
guard list unless we need to.
o Minor bugfixes (guard nodes):
- Weight guard selection by bandwidth, so that low-bandwidth nodes
don't get overused as guards.
o Minor bugfixes (directory):
- Correctly count the number of authorities that recommend each
version. Previously, we were under-counting by 1.
- Fix a potential crash bug when we load many server descriptors at
once and some of them make others of them obsolete. Fixes bug 458.
o Minor bugfixes (hidden services):
- Stop tearing down the whole circuit when the user asks for a
connection to a port that the hidden service didn't configure.
Resolves bug 444.
o Minor bugfixes (misc):
- On Windows, we were preventing other processes from reading
cached-routers while Tor was running. Reported by janbar.
- Fix a possible (but very unlikely) bug in picking routers by
bandwidth. Add a log message to confirm that it is in fact
unlikely. Patch from lodger.
- Backport a couple of memory leak fixes.
- Backport miscellaneous cosmetic bugfixes.
Changes in version 0.2.0.2-alpha - 2007-06-02
o Major bugfixes on 0.2.0.1-alpha:
- Fix an assertion failure related to servers without extra-info digests.
Resolves bugs 441 and 442.
o Minor features (directory):
- Support "If-Modified-Since" when answering HTTP requests for
directories, running-routers documents, and network-status documents.
(There's no need to support it for router descriptors, since those
are downloaded by descriptor digest.)
o Minor build issues:
- Clear up some MIPSPro compiler warnings.
- When building from a tarball on a machine that happens to have SVK
installed, report the micro-revision as whatever version existed
in the tarball, not as "x".
Changes in version 0.2.0.1-alpha - 2007-06-01
This early development snapshot provides new features for people running
Tor as both a client and a server (check out the new RelayBandwidth
config options); lets Tor run as a DNS proxy; and generally moves us
forward on a lot of fronts.
o Major features, server usability:
- New config options RelayBandwidthRate and RelayBandwidthBurst:
a separate set of token buckets for relayed traffic. Right now
relayed traffic is defined as answers to directory requests, and
OR connections that don't have any local circuits on them.
o Major features, client usability:
- A client-side DNS proxy feature to replace the need for
dns-proxy-tor: Just set "DNSPort 9999", and Tor will now listen
for DNS requests on port 9999, use the Tor network to resolve them
anonymously, and send the reply back like a regular DNS server.
The code still only implements a subset of DNS.
- Make PreferTunneledDirConns and TunnelDirConns work even when
we have no cached directory info. This means Tor clients can now
do all of their connections protected by TLS.
o Major features, performance and efficiency:
- Directory authorities accept and serve "extra info" documents for
routers. These documents contain fields from router descriptors
that aren't usually needed, and that use a lot of excess
bandwidth. Once these fields are removed from router descriptors,
the bandwidth savings should be about 60%. [Partially implements
proposal 104.]
- Servers upload extra-info documents to any authority that accepts
them. Authorities (and caches that have been configured to download
extra-info documents) download them as needed. [Partially implements
proposal 104.]
- Change the way that Tor buffers data that it is waiting to write.
Instead of queueing data cells in an enormous ring buffer for each
client->OR or OR->OR connection, we now queue cells on a separate
queue for each circuit. This lets us use less slack memory, and
will eventually let us be smarter about prioritizing different kinds
of traffic.
- Use memory pools to allocate cells with better speed and memory
efficiency, especially on platforms where malloc() is inefficient.
- Stop reading on edge connections when their corresponding circuit
buffers are full; start again as the circuits empty out.
o Major features, other:
- Add an HSAuthorityRecordStats option that hidden service authorities
can use to track statistics of overall hidden service usage without
logging information that would be very useful to an attacker.
- Start work implementing multi-level keys for directory authorities:
Add a standalone tool to generate key certificates. (Proposal 103.)
o Security fixes:
- Directory authorities now call routers Stable if they have an
uptime of at least 30 days, even if that's not the median uptime
in the network. Implements proposal 107, suggested by Kevin Bauer
and Damon McCoy.
o Minor fixes (resource management):
- Count the number of open sockets separately from the number
of active connection_t objects. This will let us avoid underusing
our allocated connection limit.
- We no longer use socket pairs to link an edge connection to an
anonymous directory connection or a DirPort test connection.
Instead, we track the link internally and transfer the data
in-process. This saves two sockets per "linked" connection (at the
client and at the server), and avoids the nasty Windows socketpair()
workaround.
- Keep unused 4k and 16k buffers on free lists, rather than wasting 8k
for every single inactive connection_t. Free items from the
4k/16k-buffer free lists when they haven't been used for a while.
o Minor features (build):
- Make autoconf search for libevent, openssl, and zlib consistently.
- Update deprecated macros in configure.in.
- When warning about missing headers, tell the user to let us
know if the compile succeeds anyway, so we can downgrade the
warning.
- Include the current subversion revision as part of the version
string: either fetch it directly if we're in an SVN checkout, do
some magic to guess it if we're in an SVK checkout, or use
the last-detected version if we're building from a .tar.gz.
Use this version consistently in log messages.
o Minor features (logging):
- Always prepend "Bug: " to any log message about a bug.
- Put a platform string (e.g. "Linux i686") in the startup log
message, so when people paste just their logs, we know if it's
OpenBSD or Windows or what.
- When logging memory usage, break down memory used in buffers by
buffer type.
o Minor features (directory system):
- New config option V2AuthoritativeDirectory that all directory
authorities should set. This will let future authorities choose
not to serve V2 directory information.
- Directory authorities allow multiple router descriptors and/or extra
info documents to be uploaded in a single go. This will make
implementing proposal 104 simpler.
o Minor features (controller):
- Add a new config option __DisablePredictedCircuits designed for
use by the controller, when we don't want Tor to build any circuits
preemptively.
- Let the controller specify HOP=%d as an argument to ATTACHSTREAM,
so we can exit from the middle of the circuit.
- Implement "getinfo status/circuit-established".
- Implement "getinfo status/version/..." so a controller can tell
whether the current version is recommended, and whether any versions
are good, and how many authorities agree. (Patch from shibz.)
o Minor features (hidden services):
- Allow multiple HiddenServicePort directives with the same virtual
port; when they occur, the user is sent round-robin to one
of the target ports chosen at random. Partially fixes bug 393 by
adding limited ad-hoc round-robining.
o Minor features (other):
- More unit tests.
- Add a new AutomapHostsOnResolve option: when it is enabled, any
resolve request for hosts matching a given pattern causes Tor to
generate an internal virtual address mapping for that host. This
allows DNSPort to work sensibly with hidden service users. By
default, .exit and .onion addresses are remapped; the list of
patterns can be reconfigured with AutomapHostsSuffixes.
- Add an "-F" option to tor-resolve to force a resolve for a .onion
address. Thanks to the AutomapHostsOnResolve option, this is no
longer a completely silly thing to do.
- If Tor is invoked from something that isn't a shell (e.g. Vidalia),
now we expand "-f ~/.tor/torrc" correctly. Suggested by Matt Edman.
- Treat "2gb" when given in torrc for a bandwidth as meaning 2gb,
minus 1 byte: the actual maximum declared bandwidth.
o Removed features:
- Removed support for the old binary "version 0" controller protocol.
This has been deprecated since 0.1.1, and warnings have been issued
since 0.1.2. When we encounter a v0 control message, we now send
back an error and close the connection.
- Remove the old "dns worker" server DNS code: it hasn't been default
since 0.1.2.2-alpha, and all the servers seem to be using the new
eventdns code.
o Minor bugfixes (portability):
- Even though Windows is equally happy with / and \ as path separators,
try to use \ consistently on Windows and / consistently on Unix: it
makes the log messages nicer.
- Correctly report platform name on Windows 95 OSR2 and Windows 98 SE.
- Read resolv.conf files correctly on platforms where read() returns
partial results on small file reads.
o Minor bugfixes (directory):
- Correctly enforce that elements of directory objects do not appear
more often than they are allowed to appear.
- When we are reporting the DirServer line we just parsed, we were
logging the second stanza of the key fingerprint, not the first.
o Minor bugfixes (logging):
- When we hit an EOF on a log (probably because we're shutting down),
don't try to remove the log from the list: just mark it as
unusable. (Bulletproofs against bug 222.)
o Minor bugfixes (other):
- In the exitlist script, only consider the most recently published
server descriptor for each server. Also, when the user requests
a list of servers that _reject_ connections to a given address,
explicitly exclude the IPs that also have servers that accept
connections to that address. (Resolves bug 405.)
- Stop allowing hibernating servers to be "stable" or "fast".
- On Windows, we were preventing other processes from reading
cached-routers while Tor was running. (Reported by janbar)
- Make the NodeFamilies config option work. (Reported by
lodger -- it has never actually worked, even though we added it
in Oct 2004.)
- Check return values from pthread_mutex functions.
- Don't save non-general-purpose router descriptors to the disk cache,
because we have no way of remembering what their purpose was when
we restart.
- Add even more asserts to hunt down bug 417.
- Build without verbose warnings even on (not-yet-released) gcc 4.2.
- Fix a possible (but very unlikely) bug in picking routers by bandwidth.
Add a log message to confirm that it is in fact unlikely.
o Minor bugfixes (controller):
- Make 'getinfo fingerprint' return a 551 error if we're not a
server, so we match what the control spec claims we do. Reported
by daejees.
- Fix a typo in an error message when extendcircuit fails that
caused us to not follow the \r\n-based delimiter protocol. Reported
by daejees.
o Code simplifications and refactoring:
- Stop passing around circuit_t and crypt_path_t pointers that are
implicit in other procedure arguments.
- Drop the old code to choke directory connections when the
corresponding OR connections got full: thanks to the cell queue
feature, OR conns don't get full any more.
- Make dns_resolve() handle attaching connections to circuits
properly, so the caller doesn't have to.
- Rename wants_to_read and wants_to_write to read/write_blocked_on_bw.
- Keep the connection array as a dynamic smartlist_t, rather than as
a fixed-sized array. This is important, as the number of connections
is becoming increasingly decoupled from the number of sockets.
Changes in version 0.1.2.14 - 2007-05-25
Tor 0.1.2.14 changes the addresses of two directory authorities (this
change especially affects those who serve or use hidden services),
and fixes several other crash- and security-related bugs.
o Directory authority changes:
- Two directory authorities (moria1 and moria2) just moved to new
IP addresses. This change will particularly affect those who serve
or use hidden services.
o Major bugfixes (crashes):
- If a directory server runs out of space in the connection table
as it's processing a begin_dir request, it will free the exit stream
but leave it attached to the circuit, leading to unpredictable
behavior. (Reported by seeess, fixes bug 425.)
- Fix a bug in dirserv_remove_invalid() that would cause authorities
to corrupt memory under some really unlikely scenarios.
- Tighten router parsing rules. (Bugs reported by Benedikt Boss.)
- Avoid segfaults when reading from mmaped descriptor file. (Reported
by lodger.)
o Major bugfixes (security):
- When choosing an entry guard for a circuit, avoid using guards
that are in the same family as the chosen exit -- not just guards
that are exactly the chosen exit. (Reported by lodger.)
o Major bugfixes (resource management):
- If a directory authority is down, skip it when deciding where to get
networkstatus objects or descriptors. Otherwise we keep asking
every 10 seconds forever. Fixes bug 384.
- Count it as a failure if we fetch a valid network-status but we
don't want to keep it. Otherwise we'll keep fetching it and keep
not wanting to keep it. Fixes part of bug 422.
- If all of our dirservers have given us bad or no networkstatuses
lately, then stop hammering them once per minute even when we
think they're failed. Fixes another part of bug 422.
o Minor bugfixes:
- Actually set the purpose correctly for descriptors inserted with
purpose=controller.
- When we have k non-v2 authorities in our DirServer config,
we ignored the last k authorities in the list when updating our
network-statuses.
- Correctly back-off from requesting router descriptors that we are
having a hard time downloading.
- Read resolv.conf files correctly on platforms where read() returns
partial results on small file reads.
- Don't rebuild the entire router store every time we get 32K of
routers: rebuild it when the journal gets very large, or when
the gaps in the store get very large.
o Minor features:
- When routers publish SVN revisions in their router descriptors,
authorities now include those versions correctly in networkstatus
documents.
- Warn when using a version of libevent before 1.3b to run a server on
OSX or BSD: these versions interact badly with userspace threads.
Changes in version 0.1.2.13 - 2007-04-24
This release features some major anonymity fixes, such as safer path
selection; better client performance; faster bootstrapping, better
address detection, and better DNS support for servers; write limiting as
well as read limiting to make servers easier to run; and a huge pile of
other features and bug fixes. The bundles also ship with Vidalia 0.0.11.
Tor 0.1.2.13 is released in memory of Rob Levin (1955-2006), aka lilo
of the Freenode IRC network, remembering his patience and vision for
free speech on the Internet.
o Minor fixes:
- Fix a memory leak when we ask for "all" networkstatuses and we
get one we don't recognize.
- Add more asserts to hunt down bug 417.
- Disable kqueue on OS X 10.3 and earlier, to fix bug 371.
Changes in version 0.1.2.12-rc - 2007-03-16
o Major bugfixes:
- Fix an infinite loop introduced in 0.1.2.7-alpha when we serve
directory information requested inside Tor connections (i.e. via
begin_dir cells). It only triggered when the same connection was
serving other data at the same time. Reported by seeess.
o Minor bugfixes:
- When creating a circuit via the controller, send a 'launched'
event when we're done, so we follow the spec better.
Changes in version 0.1.2.11-rc - 2007-03-15
o Minor bugfixes (controller), reported by daejees:
- Correct the control spec to match how the code actually responds
to 'getinfo addr-mappings/*'.
- The control spec described a GUARDS event, but the code
implemented a GUARD event. Standardize on GUARD, but let people
ask for GUARDS too.
Changes in version 0.1.2.10-rc - 2007-03-07
o Major bugfixes (Windows):
- Do not load the NT services library functions (which may not exist)
just to detect if we're a service trying to shut down. Now we run
on Win98 and friends again.
o Minor bugfixes (other):
- Clarify a couple of log messages.
- Fix a misleading socks5 error number.
Changes in version 0.1.2.9-rc - 2007-03-02
o Major bugfixes (Windows):
- On MinGW, use "%I64u" to printf/scanf 64-bit integers, instead
of the usual GCC "%llu". This prevents a bug when saving 64-bit
int configuration values: the high-order 32 bits would get
truncated. In particular, we were being bitten by the default
MaxAdvertisedBandwidth of 128 TB turning into 0. (Fixes bug 400
and maybe also bug 397.)
o Minor bugfixes (performance):
- Use OpenSSL's AES implementation on platforms where it's faster.
This could save us as much as 10% CPU usage.
o Minor bugfixes (server):
- Do not rotate onion key immediately after setting it for the first
time.
o Minor bugfixes (directory authorities):
- Stop calling servers that have been hibernating for a long time
"stable". Also, stop letting hibernating or obsolete servers affect
uptime and bandwidth cutoffs.
- Stop listing hibernating servers in the v1 directory.
o Minor bugfixes (hidden services):
- Upload hidden service descriptors slightly less often, to reduce
load on authorities.
o Minor bugfixes (other):
- Fix an assert that could trigger if a controller quickly set then
cleared EntryNodes. Bug found by Udo van den Heuvel.
- On architectures where sizeof(int)>4, still clamp declarable bandwidth
to INT32_MAX.
- Fix a potential race condition in the rpm installer. Found by
Stefan Nordhausen.
- Try to fix eventdns warnings once and for all: do not treat a dns rcode
of 2 as indicating that the server is completely bad; it sometimes
means that the server is just bad for the request in question. (may fix
the last of bug 326.)
- Disable encrypted directory connections when we don't have a server
descriptor for the destination. We'll get this working again in
the 0.2.0 branch.
Changes in version 0.1.2.8-beta - 2007-02-26
o Major bugfixes (crashes):
- Stop crashing when the controller asks us to resetconf more than
one config option at once. (Vidalia 0.0.11 does this.)
- Fix a crash that happened on Win98 when we're given command-line
arguments: don't try to load NT service functions from advapi32.dll
except when we need them. (Bug introduced in 0.1.2.7-alpha;
resolves bug 389.)
- Fix a longstanding obscure crash bug that could occur when
we run out of DNS worker processes. (Resolves bug 390.)
o Major bugfixes (hidden services):
- Correctly detect whether hidden service descriptor downloads are
in-progress. (Suggested by Karsten Loesing; fixes bug 399.)
o Major bugfixes (accounting):
- When we start during an accounting interval before it's time to wake
up, remember to wake up at the correct time. (May fix bug 342.)
o Minor bugfixes (controller):
- Give the controller END_STREAM_REASON_DESTROY events _before_ we
clear the corresponding on_circuit variable, and remember later
that we don't need to send a redundant CLOSED event. Resolves part
3 of bug 367.
- Report events where a resolve succeeded or where we got a socks
protocol error correctly, rather than calling both of them
"INTERNAL".
- Change reported stream target addresses to IP consistently when
we finally get the IP from an exit node.
- Send log messages to the controller even if they happen to be very
long.
o Minor bugfixes (other):
- Display correct results when reporting which versions are
recommended, and how recommended they are. (Resolves bug 383.)
- Improve our estimates for directory bandwidth to be less random:
guess that an unrecognized directory will have the average bandwidth
from all known directories, not that it will have the average
bandwidth from those directories earlier than it on the list.
- If we start a server with ClientOnly 1, then set ClientOnly to 0
and hup, stop triggering an assert based on an empty onion_key.
- On platforms with no working mmap() equivalent, don't warn the
user when cached-routers doesn't exist.
- Warn the user when mmap() [or its equivalent] fails for some reason
other than file-not-found.
- Don't warn the user when cached-routers.new doesn't exist: that's
perfectly fine when starting up for the first time.
- When EntryNodes are configured, rebuild the guard list to contain,
in order: the EntryNodes that were guards before; the rest of the
EntryNodes; the nodes that were guards before.
- Mask out all signals in sub-threads; only the libevent signal
handler should be processing them. This should prevent some crashes
on some machines using pthreads. (Patch from coderman.)
- Fix switched arguments on memset in the implementation of
tor_munmap() for systems with no mmap() call.
- When Tor receives a router descriptor that it asked for, but
no longer wants (because it has received fresh networkstatuses
in the meantime), do not warn the user. Cache the descriptor if
we're a cache; drop it if we aren't.
- Make earlier entry guards _really_ get retried when the network
comes back online.
- On a malformed DNS reply, always give an error to the corresponding
DNS request.
- Build with recent libevents on platforms that do not define the
nonstandard types "u_int8_t" and friends.
o Minor features (controller):
- Warn the user when an application uses the obsolete binary v0
control protocol. We're planning to remove support for it during
the next development series, so it's good to give people some
advance warning.
- Add STREAM_BW events to report per-entry-stream bandwidth
use. (Patch from Robert Hogan.)
- Rate-limit SIGNEWNYM signals in response to controllers that
impolitely generate them for every single stream. (Patch from
mwenge; closes bug 394.)
- Make REMAP stream events have a SOURCE (cache or exit), and
make them generated in every case where we get a successful
connected or resolved cell.
o Minor bugfixes (performance):
- Call router_have_min_dir_info half as often. (This is showing up in
some profiles, but not others.)
- When using GCC, make log_debug never get called at all, and its
arguments never get evaluated, when no debug logs are configured.
(This is showing up in some profiles, but not others.)
o Minor features:
- Remove some never-implemented options. Mark PathlenCoinWeight as
obsolete.
- Implement proposal 106: Stop requiring clients to have well-formed
certificates; stop checking nicknames in certificates. (Clients
have certificates so that they can look like Tor servers, but in
the future we might want to allow them to look like regular TLS
clients instead. Nicknames in certificates serve no purpose other
than making our protocol easier to recognize on the wire.)
- Revise messages on handshake failure again to be even more clear about
which are incoming connections and which are outgoing.
- Discard any v1 directory info that's over 1 month old (for
directories) or over 1 week old (for running-routers lists).
- Do not warn when individual nodes in the configuration's EntryNodes,
ExitNodes, etc are down: warn only when all possible nodes
are down. (Fixes bug 348.)
- Always remove expired routers and networkstatus docs before checking
whether we have enough information to build circuits. (Fixes
bug 373.)
- Put a lower-bound on MaxAdvertisedBandwidth.
Changes in version 0.1.2.7-alpha - 2007-02-06
o Major bugfixes (rate limiting):
- Servers decline directory requests much more aggressively when
they're low on bandwidth. Otherwise they end up queueing more and
more directory responses, which can't be good for latency.
- But never refuse directory requests from local addresses.
- Fix a memory leak when sending a 503 response for a networkstatus
request.
- Be willing to read or write on local connections (e.g. controller
connections) even when the global rate limiting buckets are empty.
- If our system clock jumps back in time, don't publish a negative
uptime in the descriptor. Also, don't let the global rate limiting
buckets go absurdly negative.
- Flush local controller connection buffers periodically as we're
writing to them, so we avoid queueing 4+ megabytes of data before
trying to flush.
o Major bugfixes (NT services):
- Install as NT_AUTHORITY\LocalService rather than as SYSTEM; add a
command-line flag so that admins can override the default by saying
"tor --service install --user "SomeUser"". This will not affect
existing installed services. Also, warn the user that the service
will look for its configuration file in the service user's
%appdata% directory. (We can't do the 'hardwire the user's appdata
directory' trick any more, since we may not have read access to that
directory.)
o Major bugfixes (other):
- Previously, we would cache up to 16 old networkstatus documents
indefinitely, if they came from nontrusted authorities. Now we
discard them if they are more than 10 days old.
- Fix a crash bug in the presence of DNS hijacking (reported by Andrew
Del Vecchio).
- Detect and reject malformed DNS responses containing circular
pointer loops.
- If exits are rare enough that we're not marking exits as guards,
ignore exit bandwidth when we're deciding the required bandwidth
to become a guard.
- When we're handling a directory connection tunneled over Tor,
don't fill up internal memory buffers with all the data we want
to tunnel; instead, only add it if the OR connection that will
eventually receive it has some room for it. (This can lead to
slowdowns in tunneled dir connections; a better solution will have
to wait for 0.2.0.)
o Minor bugfixes (dns):
- Add some defensive programming to eventdns.c in an attempt to catch
possible memory-stomping bugs.
- Detect and reject DNS replies containing IPv4 or IPv6 records with
an incorrect number of bytes. (Previously, we would ignore the
extra bytes.)
- Fix as-yet-unused reverse IPv6 lookup code so it sends nybbles
in the correct order, and doesn't crash.
- Free memory held in recently-completed DNS lookup attempts on exit.
This was not a memory leak, but may have been hiding memory leaks.
- Handle TTL values correctly on reverse DNS lookups.
- Treat failure to parse resolv.conf as an error.
o Minor bugfixes (other):
- Fix crash with "tor --list-fingerprint" (reported by seeess).
- When computing clock skew from directory HTTP headers, consider what
time it was when we finished asking for the directory, not what
time it is now.
- Expire socks connections if they spend too long waiting for the
handshake to finish. Previously we would let them sit around for
days, if the connecting application didn't close them either.
- And if the socks handshake hasn't started, don't send a
"DNS resolve socks failed" handshake reply; just close it.
- Stop using C functions that OpenBSD's linker doesn't like.
- Don't launch requests for descriptors unless we have networkstatuses
from at least half of the authorities. This delays the first
download slightly under pathological circumstances, but can prevent
us from downloading a bunch of descriptors we don't need.
- Do not log IPs with TLS failures for incoming TLS
connections. (Fixes bug 382.)
- If the user asks to use invalid exit nodes, be willing to use
unstable ones.
- Stop using the reserved ac_cv namespace in our configure script.
- Call stat() slightly less often; use fstat() when possible.
- Refactor the way we handle pending circuits when an OR connection
completes or fails, in an attempt to fix a rare crash bug.
- Only rewrite a conn's address based on X-Forwarded-For: headers
if it's a parseable public IP address; and stop adding extra quotes
to the resulting address.
o Major features:
- Weight directory requests by advertised bandwidth. Now we can
let servers enable write limiting but still allow most clients to
succeed at their directory requests. (We still ignore weights when
choosing a directory authority; I hope this is a feature.)
o Minor features:
- Create a new file ReleaseNotes which was the old ChangeLog. The
new ChangeLog file now includes the summaries for all development
versions too.
- Check for addresses with invalid characters at the exit as well
as at the client, and warn less verbosely when they fail. You can
override this by setting ServerDNSAllowNonRFC953Addresses to 1.
- Adapt a patch from goodell to let the contrib/exitlist script
take arguments rather than require direct editing.
- Inform the server operator when we decide not to advertise a
DirPort due to AccountingMax enabled or a low BandwidthRate. It
was confusing Zax, so now we're hopefully more helpful.
- Bring us one step closer to being able to establish an encrypted
directory tunnel without knowing a descriptor first. Still not
ready yet. As part of the change, now assume we can use a
create_fast cell if we don't know anything about a router.
- Allow exit nodes to use nameservers running on ports other than 53.
- Servers now cache reverse DNS replies.
- Add an --ignore-missing-torrc command-line option so that we can
get the "use sensible defaults if the configuration file doesn't
exist" behavior even when specifying a torrc location on the command
line.
o Minor features (controller):
- Track reasons for OR connection failure; make these reasons
available via the controller interface. (Patch from Mike Perry.)
- Add a SOCKS_BAD_HOSTNAME client status event so controllers
can learn when clients are sending malformed hostnames to Tor.
- Clean up documentation for controller status events.
- Add a REMAP status to stream events to note that a stream's
address has changed because of a cached address or a MapAddress
directive.
Changes in version 0.1.2.6-alpha - 2007-01-09
o Major bugfixes:
- Fix an assert error introduced in 0.1.2.5-alpha: if a single TLS
connection handles more than 4 gigs in either direction, we crash.
- Fix an assert error introduced in 0.1.2.5-alpha: if we're an
advertised exit node, somebody might try to exit from us when
we're bootstrapping and before we've built our descriptor yet.
Refuse the connection rather than crashing.
o Minor bugfixes:
- Warn if we (as a server) find that we've resolved an address that we
weren't planning to resolve.
- Warn that using select() on any libevent version before 1.1 will be
unnecessarily slow (even for select()).
- Flush ERR-level controller status events just like we currently
flush ERR-level log events, so that a Tor shutdown doesn't prevent
the controller from learning about current events.
o Minor features (more controller status events):
- Implement EXTERNAL_ADDRESS server status event so controllers can
learn when our address changes.
- Implement BAD_SERVER_DESCRIPTOR server status event so controllers
can learn when directories reject our descriptor.
- Implement SOCKS_UNKNOWN_PROTOCOL client status event so controllers
can learn when a client application is speaking a non-socks protocol
to our SocksPort.
- Implement DANGEROUS_SOCKS client status event so controllers
can learn when a client application is leaking DNS addresses.
- Implement BUG general status event so controllers can learn when
Tor is unhappy about its internal invariants.
- Implement CLOCK_SKEW general status event so controllers can learn
when Tor thinks the system clock is set incorrectly.
- Implement GOOD_SERVER_DESCRIPTOR and ACCEPTED_SERVER_DESCRIPTOR
server status events so controllers can learn when their descriptors
are accepted by a directory.
- Implement CHECKING_REACHABILITY and REACHABILITY_{SUCCEEDED|FAILED}
server status events so controllers can learn about Tor's progress in
deciding whether it's reachable from the outside.
- Implement BAD_LIBEVENT general status event so controllers can learn
when we have a version/method combination in libevent that needs to
be changed.
- Implement NAMESERVER_STATUS, NAMESERVER_ALL_DOWN, DNS_HIJACKED,
and DNS_USELESS server status events so controllers can learn
about changes to DNS server status.
o Minor features (directory):
- Authorities no longer recommend exits as guards if this would shift
too much load to the exit nodes.
Changes in version 0.1.2.5-alpha - 2007-01-06
o Major features:
- Enable write limiting as well as read limiting. Now we sacrifice
capacity if we're pushing out lots of directory traffic, rather
than overrunning the user's intended bandwidth limits.
- Include TLS overhead when counting bandwidth usage; previously, we
would count only the bytes sent over TLS, but not the bytes used
to send them.
- Support running the Tor service with a torrc not in the same
directory as tor.exe and default to using the torrc located in
the %appdata%\Tor\ of the user who installed the service. Patch
from Matt Edman.
- Servers now check for the case when common DNS requests are going to
wildcarded addresses (i.e. all getting the same answer), and change
their exit policy to reject *:* if it's happening.
- Implement BEGIN_DIR cells, so we can connect to the directory
server via TLS to do encrypted directory requests rather than
plaintext. Enable via the TunnelDirConns and PreferTunneledDirConns
config options if you like.
o Minor features (config and docs):
- Start using the state file to store bandwidth accounting data:
the bw_accounting file is now obsolete. We'll keep generating it
for a while for people who are still using 0.1.2.4-alpha.
- Try to batch changes to the state file so that we do as few
disk writes as possible while still storing important things in
a timely fashion.
- The state file and the bw_accounting file get saved less often when
the AvoidDiskWrites config option is set.
- Make PIDFile work on Windows (untested).
- Add internal descriptions for a bunch of configuration options:
accessible via controller interface and in comments in saved
options files.
- Reject *:563 (NNTPS) in the default exit policy. We already reject
NNTP by default, so this seems like a sensible addition.
- Clients now reject hostnames with invalid characters. This should
avoid some inadvertent info leaks. Add an option
AllowNonRFC953Hostnames to disable this behavior, in case somebody
is running a private network with hosts called @, !, and #.
- Add a maintainer script to tell us which options are missing
documentation: "make check-docs".
- Add a new address-spec.txt document to describe our special-case
addresses: .exit, .onion, and .noconnnect.
o Minor features (DNS):
- Ongoing work on eventdns infrastructure: now it has dns server
and ipv6 support. One day Tor will make use of it.
- Add client-side caching for reverse DNS lookups.
- Add support to tor-resolve tool for reverse lookups and SOCKS5.
- When we change nameservers or IP addresses, reset and re-launch
our tests for DNS hijacking.
o Minor features (directory):
- Authorities now specify server versions in networkstatus. This adds
about 2% to the size of compressed networkstatus docs, and allows
clients to tell which servers support BEGIN_DIR and which don't.
The implementation is forward-compatible with a proposed future
protocol version scheme not tied to Tor versions.
- DirServer configuration lines now have an orport= option so
clients can open encrypted tunnels to the authorities without
having downloaded their descriptors yet. Enabled for moria1,
moria2, tor26, and lefkada now in the default configuration.
- Directory servers are more willing to send a 503 "busy" if they
are near their write limit, especially for v1 directory requests.
Now they can use their limited bandwidth for actual Tor traffic.
- Clients track responses with status 503 from dirservers. After a
dirserver has given us a 503, we try not to use it until an hour has
gone by, or until we have no dirservers that haven't given us a 503.
- When we get a 503 from a directory, and we're not a server, we don't
count the failure against the total number of failures allowed
for the thing we're trying to download.
- Report X-Your-Address-Is correctly from tunneled directory
connections; don't report X-Your-Address-Is when it's an internal
address; and never believe reported remote addresses when they're
internal.
- Protect against an unlikely DoS attack on directory servers.
- Add a BadDirectory flag to network status docs so that authorities
can (eventually) tell clients about caches they believe to be
broken.
o Minor features (controller):
- Have GETINFO dir/status/* work on hosts with DirPort disabled.
- Reimplement GETINFO so that info/names stays in sync with the
actual keys.
- Implement "GETINFO fingerprint".
- Implement "SETEVENTS GUARD" so controllers can get updates on
entry guard status as it changes.
o Minor features (clean up obsolete pieces):
- Remove some options that have been deprecated since at least
0.1.0.x: AccountingMaxKB, LogFile, DebugLogFile, LogLevel, and
SysLog. Use AccountingMax instead of AccountingMaxKB, and use Log
to set log options.
- We no longer look for identity and onion keys in "identity.key" and
"onion.key" -- these were replaced by secret_id_key and
secret_onion_key in 0.0.8pre1.
- We no longer require unrecognized directory entries to be
preceded by "opt".
o Major bugfixes (security):
- Stop sending the HttpProxyAuthenticator string to directory
servers when directory connections are tunnelled through Tor.
- Clients no longer store bandwidth history in the state file.
- Do not log introduction points for hidden services if SafeLogging
is set.
- When generating bandwidth history, round down to the nearest
1k. When storing accounting data, round up to the nearest 1k.
- When we're running as a server, remember when we last rotated onion
keys, so that we will rotate keys once they're a week old even if
we never stay up for a week ourselves.
o Major bugfixes (other):
- Fix a longstanding bug in eventdns that prevented the count of
timed-out resolves from ever being reset. This bug caused us to
give up on a nameserver the third time it timed out, and try it
10 seconds later... and to give up on it every time it timed out
after that.
- Take out the '5 second' timeout from the connection retry
schedule. Now the first connect attempt will wait a full 10
seconds before switching to a new circuit. Perhaps this will help
a lot. Based on observations from Mike Perry.
- Fix a bug on the Windows implementation of tor_mmap_file() that
would prevent the cached-routers file from ever loading. Reported
by John Kimble.
o Minor bugfixes:
- Fix an assert failure when a directory authority sets
AuthDirRejectUnlisted and then receives a descriptor from an
unlisted router. Reported by seeess.
- Avoid a double-free when parsing malformed DirServer lines.
- Fix a bug when a BSD-style PF socket is first used. Patch from
Fabian Keil.
- Fix a bug in 0.1.2.2-alpha that prevented clients from asking
to resolve an address at a given exit node even when they ask for
it by name.
- Servers no longer ever list themselves in their "family" line,
even if configured to do so. This makes it easier to configure
family lists conveniently.
- When running as a server, don't fall back to 127.0.0.1 when no
nameservers are configured in /etc/resolv.conf; instead, make the
user fix resolv.conf or specify nameservers explicitly. (Resolves
bug 363.)
- Stop accepting certain malformed ports in configured exit policies.
- Don't re-write the fingerprint file every restart, unless it has
changed.
- Stop warning when a single nameserver fails: only warn when _all_ of
our nameservers have failed. Also, when we only have one nameserver,
raise the threshold for deciding that the nameserver is dead.
- Directory authorities now only decide that routers are reachable
if their identity keys are as expected.
- When the user uses bad syntax in the Log config line, stop
suggesting other bad syntax as a replacement.
- Correctly detect ipv6 DNS capability on OpenBSD.
o Minor bugfixes (controller):
- Report the circuit number correctly in STREAM CLOSED events. Bug
reported by Mike Perry.
- Do not report bizarre values for results of accounting GETINFOs
when the last second's write or read exceeds the allotted bandwidth.
- Report "unrecognized key" rather than an empty string when the
controller tries to fetch a networkstatus that doesn't exist.
Changes in version 0.1.1.26 - 2006-12-14
o Security bugfixes:
- Stop sending the HttpProxyAuthenticator string to directory
servers when directory connections are tunnelled through Tor.
- Clients no longer store bandwidth history in the state file.
- Do not log introduction points for hidden services if SafeLogging
is set.
o Minor bugfixes:
- Fix an assert failure when a directory authority sets
AuthDirRejectUnlisted and then receives a descriptor from an
unlisted router (reported by seeess).
Changes in version 0.1.2.4-alpha - 2006-12-03
o Major features:
- Add support for using natd; this allows FreeBSDs earlier than
5.1.2 to have ipfw send connections through Tor without using
SOCKS. (Patch from Zajcev Evgeny with tweaks from tup.)
o Minor features:
- Make all connections to addresses of the form ".noconnect"
immediately get closed. This lets application/controller combos
successfully test whether they're talking to the same Tor by
watching for STREAM events.
- Make cross.sh cross-compilation script work even when autogen.sh
hasn't been run. (Patch from Michael Mohr.)
- Statistics dumped by -USR2 now include a breakdown of public key
operations, for profiling.
o Major bugfixes:
- Fix a major leak when directory authorities parse their
approved-routers list, a minor memory leak when we fail to pick
an exit node, and a few rare leaks on errors.
- Handle TransPort connections even when the server sends data before
the client sends data. Previously, the connection would just hang
until the client sent data. (Patch from tup based on patch from
Zajcev Evgeny.)
- Avoid assert failure when our cached-routers file is empty on
startup.
o Minor bugfixes:
- Don't log spurious warnings when we see a circuit close reason we
don't recognize; it's probably just from a newer version of Tor.
- Have directory authorities allow larger amounts of drift in uptime
without replacing the server descriptor: previously, a server that
restarted every 30 minutes could have 48 "interesting" descriptors
per day.
- Start linking to the Tor specification and Tor reference manual
correctly in the Windows installer.
- Add Vidalia to the OS X uninstaller script, so when we uninstall
Tor/Privoxy we also uninstall Vidalia.
- Resume building on Irix64, and fix a lot of warnings from its
MIPSpro C compiler.
- Don't corrupt last_guessed_ip in router_new_address_suggestion()
when we're running as a client.
Changes in version 0.1.1.25 - 2006-11-04
o Major bugfixes:
- When a client asks us to resolve (rather than connect to)
an address, and we have a cached answer, give them the cached
answer. Previously, we would give them no answer at all.
- We were building exactly the wrong circuits when we predict
hidden service requirements, meaning Tor would have to build all
its circuits on demand.
- If none of our live entry guards have a high uptime, but we
require a guard with a high uptime, try adding a new guard before
we give up on the requirement. This patch should make long-lived
connections more stable on average.
- When testing reachability of our DirPort, don't launch new
tests when there's already one in progress -- unreachable
servers were stacking up dozens of testing streams.
o Security bugfixes:
- When the user sends a NEWNYM signal, clear the client-side DNS
cache too. Otherwise we continue to act on previous information.
o Minor bugfixes:
- Avoid a memory corruption bug when creating a hash table for
the first time.
- Avoid possibility of controller-triggered crash when misusing
certain commands from a v0 controller on platforms that do not
handle printf("%s",NULL) gracefully.
- Avoid infinite loop on unexpected controller input.
- Don't log spurious warnings when we see a circuit close reason we
don't recognize; it's probably just from a newer version of Tor.
- Add Vidalia to the OS X uninstaller script, so when we uninstall
Tor/Privoxy we also uninstall Vidalia.
Changes in version 0.1.2.3-alpha - 2006-10-29
o Minor features:
- Prepare for servers to publish descriptors less often: never
discard a descriptor simply for being too old until either it is
recommended by no authorities, or until we get a better one for
the same router. Make caches consider retaining old recommended
routers for even longer.
- If most authorities set a BadExit flag for a server, clients
don't think of it as a general-purpose exit. Clients only consider
authorities that advertise themselves as listing bad exits.
- Directory servers now provide 'Pragma: no-cache' and 'Expires'
headers for content, so that we can work better in the presence of
caching HTTP proxies.
- Allow authorities to list nodes as bad exits by fingerprint or by
address.
o Minor features, controller:
- Add a REASON field to CIRC events; for backward compatibility, this
field is sent only to controllers that have enabled the extended
event format. Also, add additional reason codes to explain why
a given circuit has been destroyed or truncated. (Patches from
Mike Perry)
- Add a REMOTE_REASON field to extended CIRC events to tell the
controller about why a remote OR told us to close a circuit.
- Stream events also now have REASON and REMOTE_REASON fields,
working much like those for circuit events.
- There's now a GETINFO ns/... field so that controllers can ask Tor
about the current status of a router.
- A new event type "NS" to inform a controller when our opinion of
a router's status has changed.
- Add a GETINFO events/names and GETINFO features/names so controllers
can tell which events and features are supported.
- A new CLEARDNSCACHE signal to allow controllers to clear the
client-side DNS cache without expiring circuits.
o Security bugfixes:
- When the user sends a NEWNYM signal, clear the client-side DNS
cache too. Otherwise we continue to act on previous information.
o Minor bugfixes:
- Avoid sending junk to controllers or segfaulting when a controller
uses EVENT_NEW_DESC with verbose nicknames.
- Stop triggering asserts if the controller tries to extend hidden
service circuits (reported by mwenge).
- Avoid infinite loop on unexpected controller input.
- When the controller does a "GETINFO network-status", tell it
about even those routers whose descriptors are very old, and use
long nicknames where appropriate.
- Change NT service functions to be loaded on demand. This lets us
build with MinGW without breaking Tor for Windows 98 users.
- Do DirPort reachability tests less often, since a single test
chews through many circuits before giving up.
- In the hidden service example in torrc.sample, stop recommending
esoteric and discouraged hidden service options.
- When stopping an NT service, wait up to 10 sec for it to actually
stop. Patch from Matt Edman; resolves bug 295.
- Fix handling of verbose nicknames with ORCONN controller events:
make them show up exactly when requested, rather than exactly when
not requested.
- When reporting verbose nicknames in entry_guards_getinfo(), avoid
printing a duplicate "$" in the keys we send (reported by mwenge).
- Correctly set maximum connection limit on Cygwin. (This time
for sure!)
- Try to detect Windows correctly when cross-compiling.
- Detect the size of the routers file correctly even if it is
corrupted (on systems without mmap) or not page-aligned (on systems
with mmap). This bug was harmless.
- Sometimes we didn't bother sending a RELAY_END cell when an attempt
to open a stream fails; now we do in more cases. This should
make clients able to find a good exit faster in some cases, since
unhandleable requests will now get an error rather than timing out.
- Resolve two memory leaks when rebuilding the on-disk router cache
(reported by fookoowa).
- Clean up minor code warnings suggested by the MIPSpro C compiler,
and reported by some Centos users.
- Controller signals now work on non-Unix platforms that don't define
SIGUSR1 and SIGUSR2 the way we expect.
- Patch from Michael Mohr to contrib/cross.sh, so it checks more
values before failing, and always enables eventdns.
- Libevent-1.2 exports, but does not define in its headers, strlcpy.
Try to fix this in configure.in by checking for most functions
before we check for libevent.
Changes in version 0.1.2.2-alpha - 2006-10-07
o Major features:
- Make our async eventdns library on-by-default for Tor servers,
and plan to deprecate the separate dnsworker threads.
- Add server-side support for "reverse" DNS lookups (using PTR
records so clients can determine the canonical hostname for a given
IPv4 address). Only supported by servers using eventdns; servers
now announce in their descriptors whether they support eventdns.
- Specify and implement client-side SOCKS5 interface for reverse DNS
lookups (see doc/socks-extensions.txt).
- Add a BEGIN_DIR relay cell type for an easier in-protocol way to
connect to directory servers through Tor. Previously, clients needed
to find Tor exits to make private connections to directory servers.
- Avoid choosing Exit nodes for entry or middle hops when the
total bandwidth available from non-Exit nodes is much higher than
the total bandwidth available from Exit nodes.
- Workaround for name servers (like Earthlink's) that hijack failing
DNS requests and replace the no-such-server answer with a "helpful"
redirect to an advertising-driven search portal. Also work around
DNS hijackers who "helpfully" decline to hijack known-invalid
RFC2606 addresses. Config option "ServerDNSDetectHijacking 0"
lets you turn it off.
- Send out a burst of long-range padding cells once we've established
that we're reachable. Spread them over 4 circuits, so hopefully
a few will be fast. This exercises our bandwidth and bootstraps
us into the directory more quickly.
o New/improved config options:
- Add new config option "ResolvConf" to let the server operator
choose an alternate resolve.conf file when using eventdns.
- Add an "EnforceDistinctSubnets" option to control our "exclude
servers on the same /16" behavior. It's still on by default; this
is mostly for people who want to operate private test networks with
all the machines on the same subnet.
- If one of our entry guards is on the ExcludeNodes list, or the
directory authorities don't think it's a good guard, treat it as
if it were unlisted: stop using it as a guard, and throw it off
the guards list if it stays that way for a long time.
- Allow directory authorities to be marked separately as authorities
for the v1 directory protocol, the v2 directory protocol, and
as hidden service directories, to make it easier to retire old
authorities. V1 authorities should set "HSAuthoritativeDir 1"
to continue being hidden service authorities too.
- Remove 8888 as a LongLivedPort, and add 6697 (IRCS).
o Minor features, controller:
- Fix CIRC controller events so that controllers can learn the
identity digests of non-Named servers used in circuit paths.
- Let controllers ask for more useful identifiers for servers. Instead
of learning identity digests for un-Named servers and nicknames
for Named servers, the new identifiers include digest, nickname,
and indication of Named status. Off by default; see control-spec.txt
for more information.
- Add a "getinfo address" controller command so it can display Tor's
best guess to the user.
- New controller event to alert the controller when our server
descriptor has changed.
- Give more meaningful errors on controller authentication failure.
o Minor features, other:
- When asked to resolve a hostname, don't use non-exit servers unless
requested to do so. This allows servers with broken DNS to be
useful to the network.
- Divide eventdns log messages into warn and info messages.
- Reserve the nickname "Unnamed" for routers that can't pick
a hostname: any router can call itself Unnamed; directory
authorities will never allocate Unnamed to any particular router;
clients won't believe that any router is the canonical Unnamed.
- Only include function names in log messages for info/debug messages.
For notice/warn/err, the content of the message should be clear on
its own, and printing the function name only confuses users.
- Avoid some false positives during reachability testing: don't try
to test via a server that's on the same /24 as us.
- If we fail to build a circuit to an intended enclave, and it's
not mandatory that we use that enclave, stop wanting it.
- When eventdns is enabled, allow multithreaded builds on NetBSD and
OpenBSD. (We had previously disabled threads on these platforms
because they didn't have working thread-safe resolver functions.)
o Major bugfixes, anonymity/security:
- If a client asked for a server by name, and there's a named server
in our network-status but we don't have its descriptor yet, we
could return an unnamed server instead.
- Fix NetBSD bug that could allow someone to force uninitialized RAM
to be sent to a server's DNS resolver. This only affects NetBSD
and other platforms that do not bounds-check tolower().
- Reject (most) attempts to use Tor circuits with length one. (If
many people start using Tor as a one-hop proxy, exit nodes become
a more attractive target for compromise.)
- Just because your DirPort is open doesn't mean people should be
able to remotely teach you about hidden service descriptors. Now
only accept rendezvous posts if you've got HSAuthoritativeDir set.
o Major bugfixes, other:
- Don't crash on race condition in dns.c: tor_assert(!resolve->expire)
- When a client asks the server to resolve (not connect to)
an address, and it has a cached answer, give them the cached answer.
Previously, the server would give them no answer at all.
- Allow really slow clients to not hang up five minutes into their
directory downloads (suggested by Adam J. Richter).
- We were building exactly the wrong circuits when we anticipated
hidden service requirements, meaning Tor would have to build all
its circuits on demand.
- Avoid crashing when we mmap a router cache file of size 0.
- When testing reachability of our DirPort, don't launch new
tests when there's already one in progress -- unreachable
servers were stacking up dozens of testing streams.
o Minor bugfixes, correctness:
- If we're a directory mirror and we ask for "all" network status
documents, we would discard status documents from authorities
we don't recognize.
- Avoid a memory corruption bug when creating a hash table for
the first time.
- Avoid controller-triggered crash when misusing certain commands
from a v0 controller on platforms that do not handle
printf("%s",NULL) gracefully.
- Don't crash when a controller sends a third argument to an
"extendcircuit" request.
- Controller protocol fixes: fix encoding in "getinfo addr-mappings"
response; fix error code when "getinfo dir/status/" fails.
- Avoid crash when telling controller stream-status and a stream
is detached.
- Patch from Adam Langley to fix assert() in eventdns.c.
- Fix a debug log message in eventdns to say "X resolved to Y"
instead of "X resolved to X".
- Make eventdns give strings for DNS errors, not just error numbers.
- Track unreachable entry guards correctly: don't conflate
'unreachable by us right now' with 'listed as down by the directory
authorities'. With the old code, if a guard was unreachable by
us but listed as running, it would clog our guard list forever.
- Behave correctly in case we ever have a network with more than
2GB/s total advertised capacity.
- Make TrackExitHosts case-insensitive, and fix the behavior of
".suffix" TrackExitHosts items to avoid matching in the middle of
an address.
- Finally fix the openssl warnings from newer gccs that believe that
ignoring a return value is okay, but casting a return value and
then ignoring it is a sign of madness.
- Prevent the contrib/exitlist script from printing the same
result more than once.
- Patch from Steve Hildrey: Generate network status correctly on
non-versioning dirservers.
- Don't listen to the X-Your-Address-Is hint if you did the lookup
via Tor; otherwise you'll think you're the exit node's IP address.
o Minor bugfixes, performance:
- Two small performance improvements on parsing descriptors.
- Major performance improvement on inserting descriptors: change
algorithm from O(n^2) to O(n).
- Make the common memory allocation path faster on machines where
malloc(0) returns a pointer.
- Start remembering X-Your-Address-Is directory hints even if you're
a client, so you can become a server more smoothly.
- Avoid duplicate entries on MyFamily line in server descriptor.
o Packaging, features:
- Remove architecture from OS X builds. The official builds are
now universal binaries.
- The Debian package now uses --verify-config when (re)starting,
to distinguish configuration errors from other errors.
- Update RPMs to require libevent 1.1b.
o Packaging, bugfixes:
- Patches so Tor builds with MinGW on Windows.
- Patches so Tor might run on Cygwin again.
- Resume building on non-gcc compilers and ancient gcc. Resume
building with the -O0 compile flag. Resume building cleanly on
Debian woody.
- Run correctly on OS X platforms with case-sensitive filesystems.
- Correct includes for net/if.h and net/pfvar.h on OpenBSD (from Tup).
- Add autoconf checks so Tor can build on Solaris x86 again.
o Documentation
- Documented (and renamed) ServerDNSSearchDomains and
ServerDNSResolvConfFile options.
- Be clearer that the *ListenAddress directives can be repeated
multiple times.
Changes in version 0.1.1.24 - 2006-09-29
o Major bugfixes:
- Allow really slow clients to not hang up five minutes into their
directory downloads (suggested by Adam J. Richter).
- Fix major performance regression from 0.1.0.x: instead of checking
whether we have enough directory information every time we want to
do something, only check when the directory information has changed.
This should improve client CPU usage by 25-50%.
- Don't crash if, after a server has been running for a while,
it can't resolve its hostname.
o Minor bugfixes:
- Allow Tor to start when RunAsDaemon is set but no logs are set.
- Don't crash when the controller receives a third argument to an
"extendcircuit" request.
- Controller protocol fixes: fix encoding in "getinfo addr-mappings"
response; fix error code when "getinfo dir/status/" fails.
- Fix configure.in to not produce broken configure files with
more recent versions of autoconf. Thanks to Clint for his auto*
voodoo.
- Fix security bug on NetBSD that could allow someone to force
uninitialized RAM to be sent to a server's DNS resolver. This
only affects NetBSD and other platforms that do not bounds-check
tolower().
- Warn user when using libevent 1.1a or earlier with win32 or kqueue
methods: these are known to be buggy.
- If we're a directory mirror and we ask for "all" network status
documents, we would discard status documents from authorities
we don't recognize.
Changes in version 0.1.2.1-alpha - 2006-08-27
o Major features:
- Add "eventdns" async dns library from Adam Langley, tweaked to
build on OSX and Windows. Only enabled if you pass the
--enable-eventdns argument to configure.
- Allow servers with no hostname or IP address to learn their
IP address by asking the directory authorities. This code only
kicks in when you would normally have exited with a "no address"
error. Nothing's authenticated, so use with care.
- Rather than waiting a fixed amount of time between retrying
application connections, we wait only 5 seconds for the first,
10 seconds for the second, and 15 seconds for each retry after
that. Hopefully this will improve the expected user experience.
- Patch from Tup to add support for transparent AP connections:
this basically bundles the functionality of trans-proxy-tor
into the Tor mainline. Now hosts with compliant pf/netfilter
implementations can redirect TCP connections straight to Tor
without diverting through SOCKS. Needs docs.
- Busy directory servers save lots of memory by spooling server
descriptors, v1 directories, and v2 networkstatus docs to buffers
as needed rather than en masse. Also mmap the cached-routers
files, so we don't need to keep the whole thing in memory too.
- Automatically avoid picking more than one node from the same
/16 network when constructing a circuit.
- Revise and clean up the torrc.sample that we ship with; add
a section for BandwidthRate and BandwidthBurst.
o Minor features:
- Split circuit_t into origin_circuit_t and or_circuit_t, and
split connection_t into edge, or, dir, control, and base structs.
These will save quite a bit of memory on busy servers, and they'll
also help us track down bugs in the code and bugs in the spec.
- Experimentally re-enable kqueue on OSX when using libevent 1.1b
or later. Log when we are doing this, so we can diagnose it when
it fails. (Also, recommend libevent 1.1b for kqueue and
win32 methods; deprecate libevent 1.0b harder; make libevent
recommendation system saner.)
- Start being able to build universal binaries on OS X (thanks
to Phobos).
- Export the default exit policy via the control port, so controllers
don't need to guess what it is / will be later.
- Add a man page entry for ProtocolWarnings.
- Add TestVia config option to the man page.
- Remove even more protocol-related warnings from Tor server logs,
such as bad TLS handshakes and malformed begin cells.
- Stop fetching descriptors if you're not a dir mirror and you
haven't tried to establish any circuits lately. [This currently
causes some dangerous behavior, because when you start up again
you'll use your ancient server descriptors.]
- New DirPort behavior: if you have your dirport set, you download
descriptors aggressively like a directory mirror, whether or not
your ORPort is set.
- Get rid of the router_retry_connections notion. Now routers
no longer try to rebuild long-term connections to directory
authorities, and directory authorities no longer try to rebuild
long-term connections to all servers. We still don't hang up
connections in these two cases though -- we need to look at it
more carefully to avoid flapping, and we likely need to wait til
0.1.1.x is obsolete.
- Drop compatibility with obsolete Tors that permit create cells
to have the wrong circ_id_type.
- Re-enable per-connection rate limiting. Get rid of the "OP
bandwidth" concept. Lay groundwork for "bandwidth classes" --
separate global buckets that apply depending on what sort of conn
it is.
- Start publishing one minute or so after we find our ORPort
to be reachable. This will help reduce the number of descriptors
we have for ourselves floating around, since it's quite likely
other things (e.g. DirPort) will change during that minute too.
- Fork the v1 directory protocol into its own spec document,
and mark dir-spec.txt as the currently correct (v2) spec.
o Major bugfixes:
- When we find our DirPort to be reachable, publish a new descriptor
so we'll tell the world (reported by pnx).
- Publish a new descriptor after we hup/reload. This is important
if our config has changed such that we'll want to start advertising
our DirPort now, etc.
- Allow Tor to start when RunAsDaemon is set but no logs are set.
- When we have a state file we cannot parse, tell the user and
move it aside. Now we avoid situations where the user starts
Tor in 1904, Tor writes a state file with that timestamp in it,
the user fixes her clock, and Tor refuses to start.
- Fix configure.in to not produce broken configure files with
more recent versions of autoconf. Thanks to Clint for his auto*
voodoo.
- "tor --verify-config" now exits with -1(255) or 0 depending on
whether the config options are bad or good.
- Resolve bug 321 when using dnsworkers: append a period to every
address we resolve at the exit node, so that we do not accidentally
pick up local addresses, and so that failing searches are retried
in the resolver search domains. (This is already solved for
eventdns.) (This breaks Blossom servers for now.)
- If we are using an exit enclave and we can't connect, e.g. because
its webserver is misconfigured to not listen on localhost, then
back off and try connecting from somewhere else before we fail.
o Minor bugfixes:
- Start compiling on MinGW on Windows (patches from Mike Chiussi).
- Start compiling on MSVC6 on Windows (patches from Frediano Ziglio).
- Fix bug 314: Tor clients issued "unsafe socks" warnings even
when the IP address is mapped through MapAddress to a hostname.
- Start passing "ipv4" hints to getaddrinfo(), so servers don't do
useless IPv6 DNS resolves.
- Patch suggested by Karsten Loesing: respond to SIGNAL command
before we execute the signal, in case the signal shuts us down.
- Clean up AllowInvalidNodes man page entry.
- Claim a commonname of Tor, rather than TOR, in TLS handshakes.
- Add more asserts to track down an assert error on a windows Tor
server with connection_add being called with socket == -1.
- Handle reporting OR_CONN_EVENT_NEW events to the controller.
- Fix misleading log messages: an entry guard that is "unlisted",
as well as not known to be "down" (because we've never heard
of it), is not therefore "up".
- Remove code to special-case "-cvs" ending, since it has not
actually mattered since 0.0.9.
- Make our socks5 handling more robust to broken socks clients:
throw out everything waiting on the buffer in between socks
handshake phases, since they can't possibly (so the theory
goes) have predicted what we plan to respond to them.
Changes in version 0.1.1.23 - 2006-07-30
o Major bugfixes:
- Fast Tor servers, especially exit nodes, were triggering asserts
due to a bug in handling the list of pending DNS resolves. Some
bugs still remain here; we're hunting them.
- Entry guards could crash clients by sending unexpected input.
- More fixes on reachability testing: if you find yourself reachable,
then don't ever make any client requests (so you stop predicting
circuits), then hup or have your clock jump, then later your IP
changes, you won't think circuits are working, so you won't try to
test reachability, so you won't publish.
o Minor bugfixes:
- Avoid a crash if the controller does a resetconf firewallports
and then a setconf fascistfirewall=1.
- Avoid an integer underflow when the dir authority decides whether
a router is stable: we might wrongly label it stable, and compute
a slightly wrong median stability, when a descriptor is published
later than now.
- Fix a place where we might trigger an assert if we can't build our
own server descriptor yet.
Changes in version 0.1.1.22 - 2006-07-05
o Major bugfixes:
- Fix a big bug that was causing servers to not find themselves
reachable if they changed IP addresses. Since only 0.1.1.22+
servers can do reachability testing correctly, now we automatically
make sure to test via one of these.
- Fix to allow clients and mirrors to learn directory info from
descriptor downloads that get cut off partway through.
- Directory authorities had a bug in deciding if a newly published
descriptor was novel enough to make everybody want a copy -- a few
servers seem to be publishing new descriptors many times a minute.
o Minor bugfixes:
- Fix a rare bug that was causing some servers to complain about
"closing wedged cpuworkers" and skip some circuit create requests.
- Make the Exit flag in directory status documents actually work.
Changes in version 0.1.1.21 - 2006-06-10
o Crash and assert fixes from 0.1.1.20:
- Fix a rare crash on Tor servers that have enabled hibernation.
- Fix a seg fault on startup for Tor networks that use only one
directory authority.
- Fix an assert from a race condition that occurs on Tor servers
while exiting, where various threads are trying to log that they're
exiting, and delete the logs, at the same time.
- Make our unit tests pass again on certain obscure platforms.
o Other fixes:
- Add support for building SUSE RPM packages.
- Speed up initial bootstrapping for clients: if we are making our
first ever connection to any entry guard, then don't mark it down
right after that.
- When only one Tor server in the network is labelled as a guard,
and we've already picked him, we would cycle endlessly picking him
again, being unhappy about it, etc. Now we specifically exclude
current guards when picking a new guard.
- Servers send create cells more reliably after the TLS connection
is established: we were sometimes forgetting to send half of them
when we had more than one pending.
- If we get a create cell that asks us to extend somewhere, but the
Tor server there doesn't match the expected digest, we now send
a destroy cell back, rather than silently doing nothing.
- Make options->RedirectExit work again.
- Make cookie authentication for the controller work again.
- Stop being picky about unusual characters in the arguments to
mapaddress. It's none of our business.
- Add a new config option "TestVia" that lets you specify preferred
middle hops to use for test circuits. Perhaps this will let me
debug the reachability problems better.
o Log / documentation fixes:
- If we're a server and some peer has a broken TLS certificate, don't
log about it unless ProtocolWarnings is set, i.e., we want to hear
about protocol violations by others.
- Fix spelling of VirtualAddrNetwork in man page.
- Add a better explanation at the top of the autogenerated torrc file
about what happened to our old torrc.
Changes in version 0.1.1.20 - 2006-05-23
o Bugfixes:
- Downgrade a log severity where servers complain that they're
invalid.
- Avoid a compile warning on FreeBSD.
- Remove string size limit on NEWDESC messages; solve bug 291.
- Correct the RunAsDaemon entry in the man page; ignore RunAsDaemon
more thoroughly when we're running on windows.
Changes in version 0.1.1.19-rc - 2006-05-03
o Minor bugs:
- Regenerate our local descriptor if it's dirty and we try to use
it locally (e.g. if it changes during reachability detection).
- If we setconf our ORPort to 0, we continued to listen on the
old ORPort and receive connections.
- Avoid a second warning about machine/limits.h on Debian
GNU/kFreeBSD.
- Be willing to add our own routerinfo into the routerlist.
Now authorities will include themselves in their directories
and network-statuses.
- Stop trying to upload rendezvous descriptors to every
directory authority: only try the v1 authorities.
- Servers no longer complain when they think they're not
registered with the directory authorities. There were too many
false positives.
- Backport dist-rpm changes so rpms can be built without errors.
o Features:
- Implement an option, VirtualAddrMask, to set which addresses
get handed out in response to mapaddress requests. This works
around a bug in tsocks where 127.0.0.0/8 is never socksified.
Changes in version 0.1.1.18-rc - 2006-04-10
o Major fixes:
- Work harder to download live network-statuses from all the
directory authorities we know about. Improve the threshold
decision logic so we're more robust to edge cases.
- When fetching rendezvous descriptors, we were willing to ask
v2 authorities too, which would always return 404.
o Minor fixes:
- Stop listing down or invalid nodes in the v1 directory. This will
reduce its bulk by about 1/3, and reduce load on directory
mirrors.
- When deciding whether a router is Fast or Guard-worthy, consider
his advertised BandwidthRate and not just the BandwidthCapacity.
- No longer ship INSTALL and README files -- they are useless now.
- Force rpmbuild to behave and honor target_cpu.
- Avoid warnings about machine/limits.h on Debian GNU/kFreeBSD.
- Start to include translated versions of the tor-doc-*.html
files, along with the screenshots. Still needs more work.
- Start sending back 512 and 451 errors if mapaddress fails,
rather than not sending anything back at all.
- When we fail to bind or listen on an incoming or outgoing
socket, we should close it before failing. otherwise we just
leak it. (thanks to weasel for finding.)
- Allow "getinfo dir/status/foo" to work, as long as your DirPort
is enabled. (This is a hack, and will be fixed in 0.1.2.x.)
- Make NoPublish (even though deprecated) work again.
- Fix a minor security flaw where a versioning auth dirserver
could list a recommended version many times in a row to make
clients more convinced that it's recommended.
- Fix crash bug if there are two unregistered servers running
with the same nickname, one of them is down, and you ask for
them by nickname in your EntryNodes or ExitNodes. Also, try
to pick the one that's running rather than an arbitrary one.
- Fix an infinite loop we could hit if we go offline for too long.
- Complain when we hit WSAENOBUFS on recv() or write() too.
Perhaps this will help us hunt the bug.
- If you're not a versioning dirserver, don't put the string
"client-versions \nserver-versions \n" in your network-status.
- Lower the minimum required number of file descriptors to 1000,
so we can have some overhead for Valgrind on Linux, where the
default ulimit -n is 1024.
o New features:
- Add tor.dizum.com as the fifth authoritative directory server.
- Add a new config option FetchUselessDescriptors, off by default,
for when you plan to run "exitlist" on your client and you want
to know about even the non-running descriptors.
Changes in version 0.1.1.17-rc - 2006-03-28
o Major fixes:
- Clients and servers since 0.1.1.10-alpha have been expiring
connections whenever they are idle for 5 minutes and they *do*
have circuits on them. Oops. With this new version, clients will
discard their previous entry guard choices and avoid choosing
entry guards running these flawed versions.
- Fix memory leak when uncompressing concatenated zlib streams. This
was causing substantial leaks over time on Tor servers.
- The v1 directory was including servers as much as 48 hours old,
because that's how the new routerlist->routers works. Now only
include them if they're 20 hours old or less.
o Minor fixes:
- Resume building on irix64, netbsd 2.0, etc.
- On non-gcc compilers (e.g. solaris), use "-g -O" instead of
"-Wall -g -O2".
- Stop writing the "router.desc" file, ever. Nothing uses it anymore,
and it is confusing some users.
- Mirrors stop caching the v1 directory so often.
- Make the max number of old descriptors that a cache will hold
rise with the number of directory authorities, so we can scale.
- Change our win32 uname() hack to be more forgiving about what
win32 versions it thinks it's found.
o New features:
- Add lefkada.eecs.harvard.edu as a fourth authoritative directory
server.
- When the controller's *setconf commands fail, collect an error
message in a string and hand it back to the controller.
- Make the v2 dir's "Fast" flag based on relative capacity, just
like "Stable" is based on median uptime. Name everything in the
top 7/8 Fast, and only the top 1/2 gets to be a Guard.
- Log server fingerprint on startup, so new server operators don't
have to go hunting around their filesystem for it.
- Return a robots.txt on our dirport to discourage google indexing.
- Let the controller ask for GETINFO dir/status/foo so it can ask
directly rather than connecting to the dir port. Only works when
dirport is set for now.
o New config options rather than constants in the code:
- SocksTimeout: How long do we let a socks connection wait
unattached before we fail it?
- CircuitBuildTimeout: Cull non-open circuits that were born
at least this many seconds ago.
- CircuitIdleTimeout: Cull open clean circuits that were born
at least this many seconds ago.
Changes in version 0.1.1.16-rc - 2006-03-18
o Bugfixes on 0.1.1.15-rc:
- Fix assert when the controller asks to attachstream a connect-wait
or resolve-wait stream.
- Now do address rewriting when the controller asks us to attach
to a particular circuit too. This will let Blossom specify
"moria2.exit" without having to learn what moria2's IP address is.
- Make the "tor --verify-config" command-line work again, so people
can automatically check if their torrc will parse.
- Authoritative dirservers no longer require an open connection from
a server to consider him "reachable". We need this change because
when we add new auth dirservers, old servers won't know not to
hang up on them.
- Let Tor build on Sun CC again.
- Fix an off-by-one buffer size in dirserv.c that magically never
hit our three authorities but broke sjmurdoch's own tor network.
- If we as a directory mirror don't know of any v1 directory
authorities, then don't try to cache any v1 directories.
- Stop warning about unknown servers in our family when they are
given as hex digests.
- Stop complaining as quickly to the server operator that he
hasn't registered his nickname/key binding.
- Various cleanups so we can add new V2 Auth Dirservers.
- Change "AllowUnverifiedNodes" to "AllowInvalidNodes", to
reflect the updated flags in our v2 dir protocol.
- Resume allowing non-printable characters for exit streams (both
for connecting and for resolving). Now we tolerate applications
that don't follow the RFCs. But continue to block malformed names
at the socks side.
o Bugfixes on 0.1.0.x:
- Fix assert bug in close_logs(): when we close and delete logs,
remove them all from the global "logfiles" list.
- Fix minor integer overflow in calculating when we expect to use up
our bandwidth allocation before hibernating.
- Fix a couple of bugs in OpenSSL detection. Also, deal better when
there are multiple SSLs installed with different versions.
- When we try to be a server and Address is not explicitly set and
our hostname resolves to a private IP address, try to use an
interface address if it has a public address. Now Windows machines
that think of themselves as localhost can work by default.
o New features:
- Let the controller ask for GETINFO dir/server/foo so it can ask
directly rather than connecting to the dir port.
- Let the controller tell us about certain router descriptors
that it doesn't want Tor to use in circuits. Implement
SETROUTERPURPOSE and modify +POSTDESCRIPTOR to do this.
- New config option SafeSocks to reject all application connections
using unsafe socks protocols. Defaults to off.
Changes in version 0.1.1.15-rc - 2006-03-11
o Bugfixes and cleanups:
- When we're printing strings from the network, don't try to print
non-printable characters. This protects us against shell escape
sequence exploits, and also against attacks to fool humans into
misreading their logs.
- Fix a bug where Tor would fail to establish any connections if you
left it off for 24 hours and then started it: we were happy with
the obsolete network statuses, but they all referred to router
descriptors that were too old to fetch, so we ended up with no
valid router descriptors.
- Fix a seg fault in the controller's "getinfo orconn-status"
command while listing status on incoming handshaking connections.
Introduce a status name "NEW" for these connections.
- If we get a linelist or linelist_s config option from the torrc
(e.g. ExitPolicy) and it has no value, warn and skip rather than
silently resetting it to its default.
- Don't abandon entry guards until they've been down or gone for
a whole month.
- Cleaner and quieter log messages.
o New features:
- New controller signal NEWNYM that makes new application requests
use clean circuits.
- Add a new circuit purpose 'controller' to let the controller ask
for a circuit that Tor won't try to use. Extend the EXTENDCIRCUIT
controller command to let you specify the purpose if you're
starting a new circuit. Add a new SETCIRCUITPURPOSE controller
command to let you change a circuit's purpose after it's been
created.
- Accept "private:*" in routerdesc exit policies; not generated yet
because older Tors do not understand it.
- Add BSD-style contributed startup script "rc.subr" from Peter
Thoenen.
Changes in version 0.1.1.14-alpha - 2006-02-20
o Bugfixes on 0.1.1.x:
- Don't die if we ask for a stdout or stderr log (even implicitly)
and we're set to RunAsDaemon -- just warn.
- We still had a few bugs in the OR connection rotation code that
caused directory servers to slowly aggregate connections to other
fast Tor servers. This time for sure!
- Make log entries on Win32 include the name of the function again.
- We were treating a pair of exit policies if they were equal even
if one said accept and the other said reject -- causing us to
not always publish a new descriptor since we thought nothing
had changed.
- Retry pending server downloads as well as pending networkstatus
downloads when we unexpectedly get a socks request.
- We were ignoring the IS_FAST flag in the directory status,
meaning we were willing to pick trivial-bandwidth nodes for "fast"
connections.
- If the controller's SAVECONF command fails (e.g. due to file
permissions), let the controller know that it failed.
o Features:
- If we're trying to be a Tor server and running Windows 95/98/ME
as a server, explain that we'll likely crash.
- When we're a server, a client asks for an old-style directory,
and our write bucket is empty, don't give it to him. This way
small servers can continue to serve the directory *sometimes*,
without getting overloaded.
- Compress exit policies even more -- look for duplicate lines
and remove them.
- Clients now honor the "guard" flag in the router status when
picking entry guards, rather than looking at is_fast or is_stable.
- Retain unrecognized lines in $DATADIR/state file, so that we can
be forward-compatible.
- Generate 18.0.0.0/8 address policy format in descs when we can;
warn when the mask is not reducible to a bit-prefix.
- Let the user set ControlListenAddress in the torrc. This can be
dangerous, but there are some cases (like a secured LAN) where it
makes sense.
- Split ReachableAddresses into ReachableDirAddresses and
ReachableORAddresses, so we can restrict Dir conns to port 80
and OR conns to port 443.
- Now we can target arch and OS in rpm builds (contributed by
Phobos). Also make the resulting dist-rpm filename match the
target arch.
- New config options to help controllers: FetchServerDescriptors
and FetchHidServDescriptors for whether to fetch server
info and hidserv info or let the controller do it, and
PublishServerDescriptor and PublishHidServDescriptors.
- Also let the controller set the __AllDirActionsPrivate config
option if you want all directory fetches/publishes to happen via
Tor (it assumes your controller bootstraps your circuits).
Changes in version 0.1.0.17 - 2006-02-17
o Crash bugfixes on 0.1.0.x:
- When servers with a non-zero DirPort came out of hibernation,
sometimes they would trigger an assert.
o Other important bugfixes:
- On platforms that don't have getrlimit (like Windows), we were
artificially constraining ourselves to a max of 1024
connections. Now just assume that we can handle as many as 15000
connections. Hopefully this won't cause other problems.
o Backported features:
- When we're a server, a client asks for an old-style directory,
and our write bucket is empty, don't give it to him. This way
small servers can continue to serve the directory *sometimes*,
without getting overloaded.
- Whenever you get a 503 in response to a directory fetch, try
once more. This will become important once servers start sending
503's whenever they feel busy.
- Fetch a new directory every 120 minutes, not every 40 minutes.
Now that we have hundreds of thousands of users running the old
directory algorithm, it's starting to hurt a lot.
- Bump up the period for forcing a hidden service descriptor upload
from 20 minutes to 1 hour.
Changes in version 0.1.1.13-alpha - 2006-02-09
o Crashes in 0.1.1.x:
- When you tried to setconf ORPort via the controller, Tor would
crash. So people using TorCP to become a server were sad.
- Solve (I hope) the stack-smashing bug that we were seeing on fast
servers. The problem appears to be something do with OpenSSL's
random number generation, or how we call it, or something. Let me
know if the crashes continue.
- Turn crypto hardware acceleration off by default, until we find
somebody smart who can test it for us. (It appears to produce
seg faults in at least some cases.)
- Fix a rare assert error when we've tried all intro points for
a hidden service and we try fetching the service descriptor again:
"Assertion conn->state != AP_CONN_STATE_RENDDESC_WAIT failed"
o Major fixes:
- Fix a major load balance bug: we were round-robining in 16 KB
chunks, and servers with bandwidthrate of 20 KB, while downloading
a 600 KB directory, would starve their other connections. Now we
try to be a bit more fair.
- Dir authorities and mirrors were never expiring the newest
descriptor for each server, causing memory and directory bloat.
- Fix memory-bloating and connection-bloating bug on servers: We
were never closing any connection that had ever had a circuit on
it, because we were checking conn->n_circuits == 0, yet we had a
bug that let it go negative.
- Make Tor work using squid as your http proxy again -- squid
returns an error if you ask for a URL that's too long, and it uses
a really generic error message. Plus, many people are behind a
transparent squid so they don't even realize it.
- On platforms that don't have getrlimit (like Windows), we were
artificially constraining ourselves to a max of 1024
connections. Now just assume that we can handle as many as 15000
connections. Hopefully this won't cause other problems.
- Add a new config option ExitPolicyRejectPrivate which defaults to
1. This means all exit policies will begin with rejecting private
addresses, unless the server operator explicitly turns it off.
o Major features:
- Clients no longer download descriptors for non-running
descriptors.
- Before we add new directory authorities, we should make it
clear that only v1 authorities should receive/publish hidden
service descriptors.
o Minor features:
- As soon as we've fetched some more directory info, immediately
try to download more server descriptors. This way we don't have
a 10 second pause during initial bootstrapping.
- Remove even more loud log messages that the server operator can't
do anything about.
- When we're running an obsolete or un-recommended version, make
the log message more clear about what the problem is and what
versions *are* still recommended.
- Provide a more useful warn message when our onion queue gets full:
the CPU is too slow or the exit policy is too liberal.
- Don't warn when we receive a 503 from a dirserver/cache -- this
will pave the way for them being able to refuse if they're busy.
- When we fail to bind a listener, try to provide a more useful
log message: e.g., "Is Tor already running?"
- Adjust tor-spec to parameterize cell and key lengths. Now Ian
Goldberg can prove things about our handshake protocol more
easily.
- MaxConn has been obsolete for a while now. Document the ConnLimit
config option, which is a *minimum* number of file descriptors
that must be available else Tor refuses to start.
- Apply Matt Ghali's --with-syslog-facility patch to ./configure
if you log to syslog and want something other than LOG_DAEMON.
- Make dirservers generate a separate "guard" flag to mean,
"would make a good entry guard". Make clients parse it and vote
on it. Not used by clients yet.
- Implement --with-libevent-dir option to ./configure. Also, improve
search techniques to find libevent, and use those for openssl too.
- Bump the default bandwidthrate to 3 MB, and burst to 6 MB
- Only start testing reachability once we've established a
circuit. This will make startup on dirservers less noisy.
- Don't try to upload hidden service descriptors until we have
established a circuit.
- Fix the controller's "attachstream 0" command to treat conn like
it just connected, doing address remapping, handling .exit and
.onion idioms, and so on. Now we're more uniform in making sure
that the controller hears about new and closing connections.
Changes in version 0.1.1.12-alpha - 2006-01-11
o Bugfixes on 0.1.1.x:
- The fix to close duplicate server connections was closing all
Tor client connections if they didn't establish a circuit
quickly enough. Oops.
- Fix minor memory issue (double-free) that happened on exit.
o Bugfixes on 0.1.0.x:
- Tor didn't warn when it failed to open a log file.
Changes in version 0.1.1.11-alpha - 2006-01-10
o Crashes in 0.1.1.x:
- Include all the assert/crash fixes from 0.1.0.16.
- If you start Tor and then quit very quickly, there were some
races that tried to free things that weren't allocated yet.
- Fix a rare memory stomp if you're running hidden services.
- Fix segfault when specifying DirServer in config without nickname.
- Fix a seg fault when you finish connecting to a server but at
that moment you dump his server descriptor.
- Extendcircuit and Attachstream controller commands would
assert/crash if you don't give them enough arguments.
- Fix an assert error when we're out of space in the connection_list
and we try to post a hidden service descriptor (reported by weasel).
- If you specify a relative torrc path and you set RunAsDaemon in
your torrc, then it chdir()'s to the new directory. If you HUP,
it tries to load the new torrc location, fails, and exits.
The fix: no longer allow a relative path to torrc using -f.
o Major features:
- Implement "entry guards": automatically choose a handful of entry
nodes and stick with them for all circuits. Only pick new guards
when the ones you have are unsuitable, and if the old guards
become suitable again, switch back. This will increase security
dramatically against certain end-point attacks. The EntryNodes
config option now provides some hints about which entry guards you
want to use most; and StrictEntryNodes means to only use those.
- New directory logic: download by descriptor digest, not by
fingerprint. Caches try to download all listed digests from
authorities; clients try to download "best" digests from caches.
This avoids partitioning and isolating attacks better.
- Make the "stable" router flag in network-status be the median of
the uptimes of running valid servers, and make clients pay
attention to the network-status flags. Thus the cutoff adapts
to the stability of the network as a whole, making IRC, IM, etc
connections more reliable.
o Major fixes:
- Tor servers with dynamic IP addresses were needing to wait 18
hours before they could start doing reachability testing using
the new IP address and ports. This is because they were using
the internal descriptor to learn what to test, yet they were only
rebuilding the descriptor once they decided they were reachable.
- Tor 0.1.1.9 and 0.1.1.10 had a serious bug that caused clients
to download certain server descriptors, throw them away, and then
fetch them again after 30 minutes. Now mirrors throw away these
server descriptors so clients can't get them.
- We were leaving duplicate connections to other ORs open for a week,
rather than closing them once we detect a duplicate. This only
really affected authdirservers, but it affected them a lot.
- Spread the authdirservers' reachability testing over the entire
testing interval, so we don't try to do 500 TLS's at once every
20 minutes.
o Minor fixes:
- If the network is down, and we try to connect to a conn because
we have a circuit in mind, and we timeout (30 seconds) because the
network never answers, we were expiring the circuit, but we weren't
obsoleting the connection or telling the entry_guards functions.
- Some Tor servers process billions of cells per day. These statistics
need to be uint64_t's.
- Check for integer overflows in more places, when adding elements
to smartlists. This could possibly prevent a buffer overflow
on malicious huge inputs. I don't see any, but I haven't looked
carefully.
- ReachableAddresses kept growing new "reject *:*" lines on every
setconf/reload.
- When you "setconf log" via the controller, it should remove all
logs. We were automatically adding back in a "log notice stdout".
- Newly bootstrapped Tor networks couldn't establish hidden service
circuits until they had nodes with high uptime. Be more tolerant.
- We were marking servers down when they could not answer every piece
of the directory request we sent them. This was far too harsh.
- Fix the torify (tsocks) config file to not use Tor for localhost
connections.
- Directory authorities now go to the proper authority when asking for
a networkstatus, even when they want a compressed one.
- Fix a harmless bug that was causing Tor servers to log
"Got an end because of misc error, but we're not an AP. Closing."
- Authorities were treating their own descriptor changes as cosmetic,
meaning the descriptor available in the network-status and the
descriptor that clients downloaded were different.
- The OS X installer was adding a symlink for tor_resolve but
the binary was called tor-resolve (reported by Thomas Hardly).
- Workaround a problem with some http proxies where they refuse GET
requests that specify "Content-Length: 0" (reported by Adrian).
- Fix wrong log message when you add a "HiddenServiceNodes" config
line without any HiddenServiceDir line (reported by Chris Thomas).
o Minor features:
- Write the TorVersion into the state file so we have a prayer of
keeping forward and backward compatibility.
- Revive the FascistFirewall config option rather than eliminating it:
now it's a synonym for ReachableAddresses *:80,*:443.
- Clients choose directory servers from the network status lists,
not from their internal list of router descriptors. Now they can
go to caches directly rather than needing to go to authorities
to bootstrap.
- Directory authorities ignore router descriptors that have only
cosmetic differences: do this for 0.1.0.x servers now too.
- Add a new flag to network-status indicating whether the server
can answer v2 directory requests too.
- Authdirs now stop whining so loudly about bad descriptors that
they fetch from other dirservers. So when there's a log complaint,
it's for sure from a freshly uploaded descriptor.
- Reduce memory requirements in our structs by changing the order
of fields.
- There used to be two ways to specify your listening ports in a
server descriptor: on the "router" line and with a separate "ports"
line. Remove support for the "ports" line.
- New config option "AuthDirRejectUnlisted" for auth dirservers as
a panic button: if we get flooded with unusable servers we can
revert to only listing servers in the approved-routers file.
- Auth dir servers can now mark a fingerprint as "!reject" or
"!invalid" in the approved-routers file (as its nickname), to
refuse descriptors outright or include them but marked as invalid.
- Servers store bandwidth history across restarts/crashes.
- Add reasons to DESTROY and RELAY_TRUNCATED cells, so clients can
get a better idea of why their circuits failed. Not used yet.
- Directory mirrors now cache up to 16 unrecognized network-status
docs. Now we can add new authdirservers and they'll be cached too.
- When picking a random directory, prefer non-authorities if any
are known.
- New controller option "getinfo desc/all-recent" to fetch the
latest server descriptor for every router that Tor knows about.
Changes in version 0.1.0.16 - 2006-01-02
o Crash bugfixes on 0.1.0.x:
- On Windows, build with a libevent patch from "I-M Weasel" to avoid
corrupting the heap, losing FDs, or crashing when we need to resize
the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
- It turns out sparc64 platforms crash on unaligned memory access
too -- so detect and avoid this.
- Handle truncated compressed data correctly (by detecting it and
giving an error).
- Fix possible-but-unlikely free(NULL) in control.c.
- When we were closing connections, there was a rare case that
stomped on memory, triggering seg faults and asserts.
- Avoid potential infinite recursion when building a descriptor. (We
don't know that it ever happened, but better to fix it anyway.)
- We were neglecting to unlink marked circuits from soon-to-close OR
connections, which caused some rare scribbling on freed memory.
- Fix a memory stomping race bug when closing the joining point of two
rendezvous circuits.
- Fix an assert in time parsing found by Steven Murdoch.
o Other bugfixes on 0.1.0.x:
- When we're doing reachability testing, provide more useful log
messages so the operator knows what to expect.
- Do not check whether DirPort is reachable when we are suppressing
advertising it because of hibernation.
- When building with -static or on Solaris, we sometimes needed -ldl.
- When we're deciding whether a stream has enough circuits around
that can handle it, count the freshly dirty ones and not the ones
that are so dirty they won't be able to handle it.
- When we're expiring old circuits, we had a logic error that caused
us to close new rendezvous circuits rather than old ones.
- Give a more helpful log message when you try to change ORPort via
the controller: you should upgrade Tor if you want that to work.
- We were failing to parse Tor versions that start with "Tor ".
- Tolerate faulty streams better: when a stream fails for reason
exitpolicy, stop assuming that the router is lying about his exit
policy. When a stream fails for reason misc, allow it to retry just
as if it was resolvefailed. When a stream has failed three times,
reset its failure count so we can try again and get all three tries.
Changes in version 0.1.1.10-alpha - 2005-12-11
o Correctness bugfixes on 0.1.0.x:
- On Windows, build with a libevent patch from "I-M Weasel" to avoid
corrupting the heap, losing FDs, or crashing when we need to resize
the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
- Stop doing the complex voodoo overkill checking for insecure
Diffie-Hellman keys. Just check if it's in [2,p-2] and be happy.
- When we were closing connections, there was a rare case that
stomped on memory, triggering seg faults and asserts.
- We were neglecting to unlink marked circuits from soon-to-close OR
connections, which caused some rare scribbling on freed memory.
- When we're deciding whether a stream has enough circuits around
that can handle it, count the freshly dirty ones and not the ones
that are so dirty they won't be able to handle it.
- Recover better from TCP connections to Tor servers that are
broken but don't tell you (it happens!); and rotate TLS
connections once a week.
- When we're expiring old circuits, we had a logic error that caused
us to close new rendezvous circuits rather than old ones.
- Fix a scary-looking but apparently harmless bug where circuits
would sometimes start out in state CIRCUIT_STATE_OR_WAIT at
servers, and never switch to state CIRCUIT_STATE_OPEN.
- When building with -static or on Solaris, we sometimes needed to
build with -ldl.
- Give a useful message when people run Tor as the wrong user,
rather than telling them to start chowning random directories.
- We were failing to inform the controller about new .onion streams.
o Security bugfixes on 0.1.0.x:
- Refuse server descriptors if the fingerprint line doesn't match
the included identity key. Tor doesn't care, but other apps (and
humans) might actually be trusting the fingerprint line.
- We used to kill the circuit when we receive a relay command we
don't recognize. Now we just drop it.
- Start obeying our firewall options more rigorously:
. If we can't get to a dirserver directly, try going via Tor.
. Don't ever try to connect (as a client) to a place our
firewall options forbid.
. If we specify a proxy and also firewall options, obey the
firewall options even when we're using the proxy: some proxies
can only proxy to certain destinations.
- Fix a bug found by Lasse Overlier: when we were making internal
circuits (intended to be cannibalized later for rendezvous and
introduction circuits), we were picking them so that they had
useful exit nodes. There was no need for this, and it actually
aids some statistical attacks.
- Start treating internal circuits and exit circuits separately.
It's important to keep them separate because internal circuits
have their last hops picked like middle hops, rather than like
exit hops. So exiting on them will break the user's expectations.
o Bugfixes on 0.1.1.x:
- Take out the mis-feature where we tried to detect IP address
flapping for people with DynDNS, and chose not to upload a new
server descriptor sometimes.
- Try to be compatible with OpenSSL 0.9.6 again.
- Log fix: when the controller is logging about .onion addresses,
sometimes it didn't include the ".onion" part of the address.
- Don't try to modify options->DirServers internally -- if the
user didn't specify any, just add the default ones directly to
the trusted dirserver list. This fixes a bug where people running
controllers would use SETCONF on some totally unrelated config
option, and Tor would start yelling at them about changing their
DirServer lines.
- Let the controller's redirectstream command specify a port, in
case the controller wants to change that too.
- When we requested a pile of server descriptors, we sometimes
accidentally launched a duplicate request for the first one.
- Bugfix for trackhostexits: write down the fingerprint of the
chosen exit, not its nickname, because the chosen exit might not
be verified.
- When parsing foo.exit, if foo is unknown, and we are leaving
circuits unattached, set the chosen_exit field and leave the
address empty. This matters because controllers got confused
otherwise.
- Directory authorities no longer try to download server
descriptors that they know they will reject.
o Features and updates:
- Replace balanced trees with hash tables: this should make stuff
significantly faster.
- Resume using the AES counter-mode implementation that we ship,
rather than OpenSSL's. Ours is significantly faster.
- Many other CPU and memory improvements.
- Add a new config option FastFirstHopPK (on by default) so clients
do a trivial crypto handshake for their first hop, since TLS has
already taken care of confidentiality and authentication.
- Add a new config option TestSocks so people can see if their
applications are using socks4, socks4a, socks5-with-ip, or
socks5-with-hostname. This way they don't have to keep mucking
with tcpdump and wondering if something got cached somewhere.
- Warn when listening on a public address for socks. I suspect a
lot of people are setting themselves up as open socks proxies,
and they have no idea that jerks on the Internet are using them,
since they simply proxy the traffic into the Tor network.
- Add "private:*" as an alias in configuration for policies. Now
you can simplify your exit policy rather than needing to list
every single internal or nonroutable network space.
- Add a new controller event type that allows controllers to get
all server descriptors that were uploaded to a router in its role
as authoritative dirserver.
- Start shipping socks-extensions.txt, tor-doc-unix.html,
tor-doc-server.html, and stylesheet.css in the tarball.
- Stop shipping tor-doc.html in the tarball.
Changes in version 0.1.1.9-alpha - 2005-11-15
o Usability improvements:
- Start calling it FooListenAddress rather than FooBindAddress,
since few of our users know what it means to bind an address
or port.
- Reduce clutter in server logs. We're going to try to make
them actually usable now. New config option ProtocolWarnings that
lets you hear about how _other Tors_ are breaking the protocol. Off
by default.
- Divide log messages into logging domains. Once we put some sort
of interface on this, it will let people looking at more verbose
log levels specify the topics they want to hear more about.
- Make directory servers return better http 404 error messages
instead of a generic "Servers unavailable".
- Check for even more Windows version flags when writing the platform
string in server descriptors, and note any we don't recognize.
- Clean up more of the OpenSSL memory when exiting, so we can detect
memory leaks better.
- Make directory authorities be non-versioning, non-naming by
default. Now we can add new directory servers without requiring
their operators to pay close attention.
- When logging via syslog, include the pid whenever we provide
a log entry. Suggested by Todd Fries.
o Performance improvements:
- Directory servers now silently throw away new descriptors that
haven't changed much if the timestamps are similar. We do this to
tolerate older Tor servers that upload a new descriptor every 15
minutes. (It seemed like a good idea at the time.)
- Inline bottleneck smartlist functions; use fast versions by default.
- Add a "Map from digest to void*" abstraction digestmap_t so we
can do less hex encoding/decoding. Use it in router_get_by_digest()
to resolve a performance bottleneck.
- Allow tor_gzip_uncompress to extract as much as possible from
truncated compressed data. Try to extract as many
descriptors as possible from truncated http responses (when
DIR_PURPOSE_FETCH_ROUTERDESC).
- Make circ->onionskin a pointer, not a static array. moria2 was using
125000 circuit_t's after it had been up for a few weeks, which
translates to 20+ megs of wasted space.
- The private half of our EDH handshake keys are now chosen out
of 320 bits, not 1024 bits. (Suggested by Ian Goldberg.)
o Security improvements:
- Start making directory caches retain old routerinfos, so soon
clients can start asking by digest of descriptor rather than by
fingerprint of server.
- Add half our entropy from RAND_poll in OpenSSL. This knows how
to use egd (if present), openbsd weirdness (if present), vms/os2
weirdness (if we ever port there), and more in the future.
o Bugfixes on 0.1.0.x:
- Do round-robin writes of at most 16 kB per write. This might be
more fair on loaded Tor servers, and it might resolve our Windows
crash bug. It might also slow things down.
- Our TLS handshakes were generating a single public/private
keypair for the TLS context, rather than making a new one for
each new connections. Oops. (But we were still rotating them
periodically, so it's not so bad.)
- When we were cannibalizing a circuit with a particular exit
node in mind, we weren't checking to see if that exit node was
already present earlier in the circuit. Oops.
- When a Tor server's IP changes (e.g. from a dyndns address),
upload a new descriptor so clients will learn too.
- Really busy servers were keeping enough circuits open on stable
connections that they were wrapping around the circuit_id
space. (It's only two bytes.) This exposed a bug where we would
feel free to reuse a circuit_id even if it still exists but has
been marked for close. Try to fix this bug. Some bug remains.
- If we would close a stream early (e.g. it asks for a .exit that
we know would refuse it) but the LeaveStreamsUnattached config
option is set by the controller, then don't close it.
o Bugfixes on 0.1.1.8-alpha:
- Fix a big pile of memory leaks, some of them serious.
- Do not try to download a routerdesc if we would immediately reject
it as obsolete.
- Resume inserting a newline between all router descriptors when
generating (old style) signed directories, since our spec says
we do.
- When providing content-type application/octet-stream for
server descriptors using .z, we were leaving out the
content-encoding header. Oops. (Everything tolerated this just
fine, but that doesn't mean we need to be part of the problem.)
- Fix a potential seg fault in getconf and getinfo using version 1
of the controller protocol.
- Avoid crash: do not check whether DirPort is reachable when we
are suppressing it because of hibernation.
- Make --hash-password not crash on exit.
Changes in version 0.1.1.8-alpha - 2005-10-07
o New features (major):
- Clients don't download or use the directory anymore. Now they
download and use network-statuses from the trusted dirservers,
and fetch individual server descriptors as needed from mirrors.
See dir-spec.txt for all the gory details.
- Be more conservative about whether to advertise our DirPort.
The main change is to not advertise if we're running at capacity
and either a) we could hibernate or b) our capacity is low and
we're using a default DirPort.
- Use OpenSSL's AES when OpenSSL has version 0.9.7 or later.
o New features (minor):
- Try to be smart about when to retry network-status and
server-descriptor fetches. Still needs some tuning.
- Stop parsing, storing, or using running-routers output (but
mirrors still cache and serve it).
- Consider a threshold of versioning dirservers (dirservers who have
an opinion about which Tor versions are still recommended) before
deciding whether to warn the user that he's obsolete.
- Dirservers can now reject/invalidate by key and IP, with the
config options "AuthDirInvalid" and "AuthDirReject". This is
useful since currently we automatically list servers as running
and usable even if we know they're jerks.
- Provide dire warnings to any users who set DirServer; move it out
of torrc.sample and into torrc.complete.
- Add MyFamily to torrc.sample in the server section.
- Add nicknames to the DirServer line, so we can refer to them
without requiring all our users to memorize their IP addresses.
- When we get an EOF or a timeout on a directory connection, note
how many bytes of serverdesc we are dropping. This will help
us determine whether it is smart to parse incomplete serverdesc
responses.
- Add a new function to "change pseudonyms" -- that is, to stop
using any currently-dirty circuits for new streams, so we don't
link new actions to old actions. Currently it's only called on
HUP (or SIGNAL RELOAD).
- On sighup, if UseHelperNodes changed to 1, use new circuits.
- Start using RAND_bytes rather than RAND_pseudo_bytes from
OpenSSL. Also, reseed our entropy every hour, not just at
startup. And entropy in 512-bit chunks, not 160-bit chunks.
o Fixes on 0.1.1.7-alpha:
- Nobody ever implemented EVENT_ADDRMAP for control protocol
version 0, so don't let version 0 controllers ask for it.
- If you requested something with too many newlines via the
v1 controller protocol, you could crash tor.
- Fix a number of memory leaks, including some pretty serious ones.
- Re-enable DirPort testing again, so Tor servers will be willing
to advertise their DirPort if it's reachable.
- On TLS handshake, only check the other router's nickname against
its expected nickname if is_named is set.
o Fixes forward-ported from 0.1.0.15:
- Don't crash when we don't have any spare file descriptors and we
try to spawn a dns or cpu worker.
- Make the numbers in read-history and write-history into uint64s,
so they don't overflow and publish negatives in the descriptor.
o Fixes on 0.1.0.x:
- For the OS X package's modified privoxy config file, comment
out the "logfile" line so we don't log everything passed
through privoxy.
- We were whining about using socks4 or socks5-with-local-lookup
even when it's an IP in the "virtual" range we designed exactly
for this case.
- We were leaking some memory every time the client changes IPs.
- Never call free() on tor_malloc()d memory. This will help us
use dmalloc to detect memory leaks.
- Check for named servers when looking them up by nickname;
warn when we'recalling a non-named server by its nickname;
don't warn twice about the same name.
- Try to list MyFamily elements by key, not by nickname, and warn
if we've not heard of the server.
- Make windows platform detection (uname equivalent) smarter.
- It turns out sparc64 doesn't like unaligned access either.
Changes in version 0.1.0.15 - 2005-09-23
o Bugfixes on 0.1.0.x:
- Reject ports 465 and 587 (spam targets) in default exit policy.
- Don't crash when we don't have any spare file descriptors and we
try to spawn a dns or cpu worker.
- Get rid of IgnoreVersion undocumented config option, and make us
only warn, never exit, when we're running an obsolete version.
- Don't try to print a null string when your server finds itself to
be unreachable and the Address config option is empty.
- Make the numbers in read-history and write-history into uint64s,
so they don't overflow and publish negatives in the descriptor.
- Fix a minor memory leak in smartlist_string_remove().
- We were only allowing ourselves to upload a server descriptor at
most every 20 minutes, even if it changed earlier than that.
- Clean up log entries that pointed to old URLs.
Changes in version 0.1.1.7-alpha - 2005-09-14
o Fixes on 0.1.1.6-alpha:
- Exit servers were crashing when people asked them to make a
connection to an address not in their exit policy.
- Looking up a non-existent stream for a v1 control connection would
cause a segfault.
- Fix a seg fault if we ask a dirserver for a descriptor by
fingerprint but he doesn't know about him.
- SETCONF was appending items to linelists, not clearing them.
- SETCONF SocksBindAddress killed Tor if it fails to bind. Now back
out and refuse the setconf if it would fail.
- Downgrade the dirserver log messages when whining about
unreachability.
o New features:
- Add Peter Palfrader's check-tor script to tor/contrib/
It lets you easily check whether a given server (referenced by
nickname) is reachable by you.
- Numerous changes to move towards client-side v2 directories. Not
enabled yet.
o Fixes on 0.1.0.x:
- If the user gave tor an odd number of command-line arguments,
we were silently ignoring the last one. Now we complain and fail.
[This wins the oldest-bug prize -- this bug has been present since
November 2002, as released in Tor 0.0.0.]
- Do not use unaligned memory access on alpha, mips, or mipsel.
It *works*, but is very slow, so we treat them as if it doesn't.
- Retry directory requests if we fail to get an answer we like
from a given dirserver (we were retrying before, but only if
we fail to connect).
- When writing the RecommendedVersions line, sort them first.
- When the client asked for a rendezvous port that the hidden
service didn't want to provide, we were sending an IP address
back along with the end cell. Fortunately, it was zero. But stop
that anyway.
- Correct "your server is reachable" log entries to indicate that
it was self-testing that told us so.
Changes in version 0.1.1.6-alpha - 2005-09-09
o Fixes on 0.1.1.5-alpha:
- We broke fascistfirewall in 0.1.1.5-alpha. Oops.
- Fix segfault in unit tests in 0.1.1.5-alpha. Oops.
- Fix bug with tor_memmem finding a match at the end of the string.
- Make unit tests run without segfaulting.
- Resolve some solaris x86 compile warnings.
- Handle duplicate lines in approved-routers files without warning.
- Fix bug where as soon as a server refused any requests due to his
exit policy (e.g. when we ask for localhost and he tells us that's
127.0.0.1 and he won't do it), we decided he wasn't obeying his
exit policy using him for any exits.
- Only do openssl hardware accelerator stuff if openssl version is
at least 0.9.7.
o New controller features/fixes:
- Add a "RESETCONF" command so you can set config options like
AllowUnverifiedNodes and LongLivedPorts to "". Also, if you give
a config option in the torrc with no value, then it clears it
entirely (rather than setting it to its default).
- Add a "GETINFO config-file" to tell us where torrc is.
- Avoid sending blank lines when GETINFO replies should be empty.
- Add a QUIT command for the controller (for using it manually).
- Fix a bug in SAVECONF that was adding default dirservers and
other redundant entries to the torrc file.
o Start on the new directory design:
- Generate, publish, cache, serve new network-status format.
- Publish individual descriptors (by fingerprint, by "all", and by
"tell me yours").
- Publish client and server recommended versions separately.
- Allow tor_gzip_uncompress() to handle multiple concatenated
compressed strings. Serve compressed groups of router
descriptors. The compression logic here could be more
memory-efficient.
- Distinguish v1 authorities (all currently trusted directories)
from v2 authorities (all trusted directories).
- Change DirServers config line to note which dirs are v1 authorities.
- Add configuration option "V1AuthoritativeDirectory 1" which
moria1, moria2, and tor26 should set.
- Remove option when getting directory cache to see whether they
support running-routers; they all do now. Replace it with one
to see whether caches support v2 stuff.
o New features:
- Dirservers now do their own external reachability testing of each
Tor server, and only list them as running if they've been found to
be reachable. We also send back warnings to the server's logs if
it uploads a descriptor that we already believe is unreachable.
- Implement exit enclaves: if we know an IP address for the
destination, and there's a running Tor server at that address
which allows exit to the destination, then extend the circuit to
that exit first. This provides end-to-end encryption and end-to-end
authentication. Also, if the user wants a .exit address or enclave,
use 4 hops rather than 3, and cannibalize a general circ for it
if you can.
- Permit transitioning from ORPort=0 to ORPort!=0, and back, from the
controller. Also, rotate dns and cpu workers if the controller
changes options that will affect them; and initialize the dns
worker cache tree whether or not we start out as a server.
- Only upload a new server descriptor when options change, 18
hours have passed, uptime is reset, or bandwidth changes a lot.
- Check [X-]Forwarded-For headers in HTTP requests when generating
log messages. This lets people run dirservers (and caches) behind
Apache but still know which IP addresses are causing warnings.
o Config option changes:
- Replace (Fascist)Firewall* config options with a new
ReachableAddresses option that understands address policies.
For example, "ReachableAddresses *:80,*:443"
- Get rid of IgnoreVersion undocumented config option, and make us
only warn, never exit, when we're running an obsolete version.
- Make MonthlyAccountingStart config option truly obsolete now.
o Fixes on 0.1.0.x:
- Reject ports 465 and 587 in the default exit policy, since
people have started using them for spam too.
- It turns out we couldn't bootstrap a network since we added
reachability detection in 0.1.0.1-rc. Good thing the Tor network
has never gone down. Add an AssumeReachable config option to let
servers and dirservers bootstrap. When we're trying to build a
high-uptime or high-bandwidth circuit but there aren't enough
suitable servers, try being less picky rather than simply failing.
- Our logic to decide if the OR we connected to was the right guy
was brittle and maybe open to a mitm for unverified routers.
- We weren't cannibalizing circuits correctly for
CIRCUIT_PURPOSE_C_ESTABLISH_REND and
CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, so we were being forced to
build those from scratch. This should make hidden services faster.
- Predict required circuits better, with an eye toward making hidden
services faster on the service end.
- Retry streams if the exit node sends back a 'misc' failure. This
should result in fewer random failures. Also, after failing
from resolve failed or misc, reset the num failures, so we give
it a fair shake next time we try.
- Clean up the rendezvous warn log msgs, and downgrade some to info.
- Reduce severity on logs about dns worker spawning and culling.
- When we're shutting down and we do something like try to post a
server descriptor or rendezvous descriptor, don't complain that
we seem to be unreachable. Of course we are, we're shutting down.
- Add TTLs to RESOLVED, CONNECTED, and END_REASON_EXITPOLICY cells.
We don't use them yet, but maybe one day our DNS resolver will be
able to discover them.
- Make ContactInfo mandatory for authoritative directory servers.
- Require server descriptors to list IPv4 addresses -- hostnames
are no longer allowed. This also fixes some potential security
problems with people providing hostnames as their address and then
preferentially resolving them to partition users.
- Change log line for unreachability to explicitly suggest /etc/hosts
as the culprit. Also make it clearer what IP address and ports we're
testing for reachability.
- Put quotes around user-supplied strings when logging so users are
more likely to realize if they add bad characters (like quotes)
to the torrc.
- Let auth dir servers start without specifying an Address config
option.
- Make unit tests (and other invocations that aren't the real Tor)
run without launching listeners, creating subdirectories, and so on.
Changes in version 0.1.1.5-alpha - 2005-08-08
o Bugfixes included in 0.1.0.14.
o Bugfixes on 0.1.0.x:
- If you write "HiddenServicePort 6667 127.0.0.1 6668" in your
torrc rather than "HiddenServicePort 6667 127.0.0.1:6668",
it would silently using ignore the 6668.
Changes in version 0.1.0.14 - 2005-08-08
o Bugfixes on 0.1.0.x:
- Fix the other half of the bug with crypto handshakes
(CVE-2005-2643).
- Fix an assert trigger if you send a 'signal term' via the
controller when it's listening for 'event info' messages.
Changes in version 0.1.1.4-alpha - 2005-08-04
o Bugfixes included in 0.1.0.13.
o Features:
- Improve tor_gettimeofday() granularity on windows.
- Make clients regenerate their keys when their IP address changes.
- Implement some more GETINFO goodness: expose helper nodes, config
options, getinfo keys.
Changes in version 0.1.0.13 - 2005-08-04
o Bugfixes on 0.1.0.x:
- Fix a critical bug in the security of our crypto handshakes.
- Fix a size_t underflow in smartlist_join_strings2() that made
it do bad things when you hand it an empty smartlist.
- Fix Windows installer to ship Tor license (thanks to Aphex for
pointing out this oversight) and put a link to the doc directory
in the start menu.
- Explicitly set no-unaligned-access for sparc: it turns out the
new gcc's let you compile broken code, but that doesn't make it
not-broken.
Changes in version 0.1.1.3-alpha - 2005-07-23
o Bugfixes on 0.1.1.2-alpha:
- Fix a bug in handling the controller's "post descriptor"
function.
- Fix several bugs in handling the controller's "extend circuit"
function.
- Fix a bug in handling the controller's "stream status" event.
- Fix an assert failure if we have a controller listening for
circuit events and we go offline.
- Re-allow hidden service descriptors to publish 0 intro points.
- Fix a crash when generating your hidden service descriptor if
you don't have enough intro points already.
o New features on 0.1.1.2-alpha:
- New controller function "getinfo accounting", to ask how
many bytes we've used in this time period.
- Experimental support for helper nodes: a lot of the risk from
a small static adversary comes because users pick new random
nodes every time they rebuild a circuit. Now users will try to
stick to the same small set of entry nodes if they can. Not
enabled by default yet.
o Bugfixes on 0.1.0.12:
- If you're an auth dir server, always publish your dirport,
even if you haven't yet found yourself to be reachable.
- Fix a size_t underflow in smartlist_join_strings2() that made
it do bad things when you hand it an empty smartlist.
Changes in version 0.1.0.12 - 2005-07-18
o New directory servers:
- tor26 has changed IP address.
o Bugfixes on 0.1.0.x:
- Fix a possible double-free in tor_gzip_uncompress().
- When --disable-threads is set, do not search for or link against
pthreads libraries.
- Don't trigger an assert if an authoritative directory server
claims its dirport is 0.
- Fix bug with removing Tor as an NT service: some people were
getting "The service did not return an error." Thanks to Matt
Edman for the fix.
Changes in version 0.1.1.2-alpha - 2005-07-15
o New directory servers:
- tor26 has changed IP address.
o Bugfixes on 0.1.0.x, crashes/leaks:
- Port the servers-not-obeying-their-exit-policies fix from
0.1.0.11.
- Fix an fd leak in start_daemon().
- On Windows, you can't always reopen a port right after you've
closed it. So change retry_listeners() to only close and re-open
ports that have changed.
- Fix a possible double-free in tor_gzip_uncompress().
o Bugfixes on 0.1.0.x, usability:
- When tor_socketpair() fails in Windows, give a reasonable
Windows-style errno back.
- Let people type "tor --install" as well as "tor -install" when
they
want to make it an NT service.
- NT service patch from Matt Edman to improve error messages.
- When the controller asks for a config option with an abbreviated
name, give the full name in our response.
- Correct the man page entry on TrackHostExitsExpire.
- Looks like we were never delivering deflated (i.e. compressed)
running-routers lists, even when asked. Oops.
- When --disable-threads is set, do not search for or link against
pthreads libraries.
o Bugfixes on 0.1.1.x:
- Fix a seg fault with autodetecting which controller version is
being used.
o Features:
- New hidden service descriptor format: put a version in it, and
let people specify introduction/rendezvous points that aren't
in "the directory" (which is subjective anyway).
- Allow the DEBUG controller event to work again. Mark certain log
entries as "don't tell this to controllers", so we avoid cycles.
Changes in version 0.1.0.11 - 2005-06-30
o Bugfixes on 0.1.0.x:
- Fix major security bug: servers were disregarding their
exit policies if clients behaved unexpectedly.
- Make OS X init script check for missing argument, so we don't
confuse users who invoke it incorrectly.
- Fix a seg fault in "tor --hash-password foo".
- The MAPADDRESS control command was broken.
Changes in version 0.1.1.1-alpha - 2005-06-29
o Bugfixes:
- Make OS X init script check for missing argument, so we don't
confuse users who invoke it incorrectly.
- Fix a seg fault in "tor --hash-password foo".
- Fix a possible way to DoS dirservers.
- When we complain that your exit policy implicitly allows local or
private address spaces, name them explicitly so operators can
fix it.
- Make the log message less scary when all the dirservers are
temporarily unreachable.
- We were printing the number of idle dns workers incorrectly when
culling them.
o Features:
- Revised controller protocol (version 1) that uses ascii rather
than binary. Add supporting libraries in python and java so you
can use the controller from your applications without caring how
our protocol works.
- Spiffy new support for crypto hardware accelerators. Can somebody
test this?
Changes in version 0.0.9.10 - 2005-06-16
o Bugfixes on 0.0.9.x (backported from 0.1.0.10):
- Refuse relay cells that claim to have a length larger than the
maximum allowed. This prevents a potential attack that could read
arbitrary memory (e.g. keys) from an exit server's process
(CVE-2005-2050).
Changes in version 0.1.0.10 - 2005-06-14
o Allow a few EINVALs from libevent before dying. Warn on kqueue with
libevent before 1.1a.
Changes in version 0.1.0.9-rc - 2005-06-09
o Bugfixes:
- Reset buf->highwater every time buf_shrink() is called, not just on
a successful shrink. This was causing significant memory bloat.
- Fix buffer overflow when checking hashed passwords.
- Security fix: if seeding the RNG on Win32 fails, quit.
- Allow seeding the RNG on Win32 even when you're not running as
Administrator.
- Disable threading on Solaris too. Something is wonky with it,
cpuworkers, and reentrant libs.
- Reenable the part of the code that tries to flush as soon as an
OR outbuf has a full TLS record available. Perhaps this will make
OR outbufs not grow as huge except in rare cases, thus saving lots
of CPU time plus memory.
- Reject malformed .onion addresses rather then passing them on as
normal web requests.
- Adapt patch from Adam Langley: fix possible memory leak in
tor_lookup_hostname().
- Initialize libevent later in the startup process, so the logs are
already established by the time we start logging libevent warns.
- Use correct errno on win32 if libevent fails.
- Check and warn about known-bad/slow libevent versions.
- Pay more attention to the ClientOnly config option.
- Have torctl.in/tor.sh.in check for location of su binary (needed
on FreeBSD)
- Correct/add man page entries for LongLivedPorts, ExitPolicy,
KeepalivePeriod, ClientOnly, NoPublish, HttpProxy, HttpsProxy,
HttpProxyAuthenticator
- Stop warning about sigpipes in the logs. We're going to
pretend that getting these occasionally is normal and fine.
- Resolve OS X installer bugs: stop claiming to be 0.0.9.2 in
certain
installer screens; and don't put stuff into StartupItems unless
the user asks you to.
- Require servers that use the default dirservers to have public IP
addresses. We have too many servers that are configured with private
IPs and their admins never notice the log entries complaining that
their descriptors are being rejected.
- Add OSX uninstall instructions. An actual uninstall script will
come later.
Changes in version 0.1.0.8-rc - 2005-05-23
o Bugfixes:
- It turns out that kqueue on OS X 10.3.9 was causing kernel
panics. Disable kqueue on all OS X Tors.
- Fix RPM: remove duplicate line accidentally added to the rpm
spec file.
- Disable threads on openbsd too, since its gethostaddr is not
reentrant either.
- Tolerate libevent 0.8 since it still works, even though it's
ancient.
- Enable building on Red Hat 9.0 again.
- Allow the middle hop of the testing circuit to be running any
version, now that most of them have the bugfix to let them connect
to unknown servers. This will allow reachability testing to work
even when 0.0.9.7-0.0.9.9 become obsolete.
- Handle relay cells with rh.length too large. This prevents
a potential attack that could read arbitrary memory (maybe even
keys) from the exit server's process.
- We screwed up the dirport reachability testing when we don't yet
have a cached version of the directory. Hopefully now fixed.
- Clean up router_load_single_router() (used by the controller),
so it doesn't seg fault on error.
- Fix a minor memory leak when somebody establishes an introduction
point at your Tor server.
- If a socks connection ends because read fails, don't warn that
you're not sending a socks reply back.
o Features:
- Add HttpProxyAuthenticator config option too, that works like
the HttpsProxyAuthenticator config option.
- Encode hashed controller passwords in hex instead of base64,
to make it easier to write controllers.
Changes in version 0.1.0.7-rc - 2005-05-17
o Bugfixes:
- Fix a bug in the OS X package installer that prevented it from
installing on Tiger.
- Fix a script bug in the OS X package installer that made it
complain during installation.
- Find libevent even if it's hiding in /usr/local/ and your
CFLAGS and LDFLAGS don't tell you to look there.
- Be able to link with libevent as a shared library (the default
after 1.0d), even if it's hiding in /usr/local/lib and even
if you haven't added /usr/local/lib to your /etc/ld.so.conf,
assuming you're running gcc. Otherwise fail and give a useful
error message.
- Fix a bug in the RPM packager: set home directory for _tor to
something more reasonable when first installing.
- Free a minor amount of memory that is still reachable on exit.
Changes in version 0.1.0.6-rc - 2005-05-14
o Bugfixes:
- Implement --disable-threads configure option. Disable threads on
netbsd by default, because it appears to have no reentrant resolver
functions.
- Apple's OS X 10.4.0 ships with a broken kqueue. The new libevent
release (1.1) detects and disables kqueue if it's broken.
- Append default exit policy before checking for implicit internal
addresses. Now we don't log a bunch of complaints on startup
when using the default exit policy.
- Some people were putting "Address " in their torrc, and they had
a buggy resolver that resolved " " to 0.0.0.0. Oops.
- If DataDir is ~/.tor, and that expands to /.tor, then default to
LOCALSTATEDIR/tor instead.
- Fix fragmented-message bug in TorControl.py.
- Resolve a minor bug which would prevent unreachable dirports
from getting suppressed in the published descriptor.
- When the controller gave us a new descriptor, we weren't resolving
it immediately, so Tor would think its address was 0.0.0.0 until
we fetched a new directory.
- Fix an uppercase/lowercase case error in suppressing a bogus
libevent warning on some Linuxes.
o Features:
- Begin scrubbing sensitive strings from logs by default. Turn off
the config option SafeLogging if you need to do debugging.
- Switch to a new buffer management algorithm, which tries to avoid
reallocing and copying quite as much. In first tests it looks like
it uses *more* memory on average, but less cpu.
- First cut at support for "create-fast" cells. Clients can use
these when extending to their first hop, since the TLS already
provides forward secrecy and authentication. Not enabled on
clients yet.
- When dirservers refuse a router descriptor, we now log its
contactinfo, platform, and the poster's IP address.
- Call tor_free_all instead of connections_free_all after forking, to
save memory on systems that need to fork.
- Whine at you if you're a server and you don't set your contactinfo.
- Implement --verify-config command-line option to check if your torrc
is valid without actually launching Tor.
- Rewrite address "serifos.exit" to "localhost.serifos.exit"
rather than just rejecting it.
Changes in version 0.1.0.5-rc - 2005-04-27
o Bugfixes:
- Stop trying to print a null pointer if an OR conn fails because
we didn't like its cert.
o Features:
- Switch our internal buffers implementation to use a ring buffer,
to hopefully improve performance for fast servers a lot.
- Add HttpsProxyAuthenticator support (basic auth only), based
on patch from Adam Langley.
- Bump the default BandwidthRate from 1 MB to 2 MB, to accommodate
the fast servers that have been joining lately.
- Give hidden service accesses extra time on the first attempt,
since 60 seconds is often only barely enough. This might improve
robustness more.
- Improve performance for dirservers: stop re-parsing the whole
directory every time you regenerate it.
- Add more debugging info to help us find the weird dns freebsd
pthreads bug; cleaner debug messages to help track future issues.
Changes in version 0.0.9.9 - 2005-04-23
o Bugfixes on 0.0.9.x:
- If unofficial Tor clients connect and send weird TLS certs, our
Tor server triggers an assert. This release contains a minimal
backport from the broader fix that we put into 0.1.0.4-rc.
Changes in version 0.1.0.4-rc - 2005-04-23
o Bugfixes:
- If unofficial Tor clients connect and send weird TLS certs, our
Tor server triggers an assert. Stop asserting, and start handling
TLS errors better in other situations too.
- When the controller asks us to tell it about all the debug-level
logs, it turns out we were generating debug-level logs while
telling it about them, which turns into a bad loop. Now keep
track of whether you're sending a debug log to the controller,
and don't log when you are.
- Fix the "postdescriptor" feature of the controller interface: on
non-complete success, only say "done" once.
o Features:
- Clients are now willing to load balance over up to 2mB, not 1mB,
of advertised bandwidth capacity.
- Add a NoPublish config option, so you can be a server (e.g. for
testing running Tor servers in other Tor networks) without
publishing your descriptor to the primary dirservers.
Changes in version 0.1.0.3-rc - 2005-04-08
o Improvements on 0.1.0.2-rc:
- Client now retries when streams end early for 'hibernating' or
'resource limit' reasons, rather than failing them.
- More automated handling for dirserver operators:
- Automatically approve nodes running 0.1.0.2-rc or later,
now that the the reachability detection stuff is working.
- Now we allow two unverified servers with the same nickname
but different keys. But if a nickname is verified, only that
nickname+key are allowed.
- If you're an authdirserver connecting to an address:port,
and it's not the OR you were expecting, forget about that
descriptor. If he *was* the one you were expecting, then forget
about all other descriptors for that address:port.
- Allow servers to publish descriptors from 12 hours in the future.
Corollary: only whine about clock skew from the dirserver if
he's a trusted dirserver (since now even verified servers could
have quite wrong clocks).
- Adjust maximum skew and age for rendezvous descriptors: let skew
be 48 hours rather than 90 minutes.
- Efficiency improvements:
- Keep a big splay tree of (circid,orconn)->circuit mappings to make
it much faster to look up a circuit for each relay cell.
- Remove most calls to assert_all_pending_dns_resolves_ok(),
since they're eating our cpu on exit nodes.
- Stop wasting time doing a case insensitive comparison for every
dns name every time we do any lookup. Canonicalize the names to
lowercase and be done with it.
- Start sending 'truncated' cells back rather than destroy cells,
if the circuit closes in front of you. This means we won't have
to abandon partially built circuits.
- Only warn once per nickname from add_nickname_list_to_smartlist
per failure, so an entrynode or exitnode choice that's down won't
yell so much.
- Put a note in the torrc about abuse potential with the default
exit policy.
- Revise control spec and implementation to allow all log messages to
be sent to controller with their severities intact (suggested by
Matt Edman). Update TorControl to handle new log event types.
- Provide better explanation messages when controller's POSTDESCRIPTOR
fails.
- Stop putting nodename in the Platform string in server descriptors.
It doesn't actually help, and it is confusing/upsetting some people.
o Bugfixes on 0.1.0.2-rc:
- We were printing the host mask wrong in exit policies in server
descriptors. This isn't a critical bug though, since we were still
obeying the exit policy internally.
- Fix Tor when compiled with libevent but without pthreads: move
connection_unregister() from _connection_free() to
connection_free().
- Fix an assert trigger (already fixed in 0.0.9.x): when we have
the rare mysterious case of accepting a conn on 0.0.0.0:0, then
when we look through the connection array, we'll find any of the
cpu/dnsworkers. This is no good.
o Bugfixes on 0.0.9.8:
- Fix possible bug on threading platforms (e.g. win32) which was
leaking a file descriptor whenever a cpuworker or dnsworker died.
- When using preferred entry or exit nodes, ignore whether the
circuit wants uptime or capacity. They asked for the nodes, they
get the nodes.
- chdir() to your datadirectory at the *end* of the daemonize process,
not the beginning. This was a problem because the first time you
run tor, if your datadir isn't there, and you have runasdaemon set
to 1, it will try to chdir to it before it tries to create it. Oops.
- Handle changed router status correctly when dirserver reloads
fingerprint file. We used to be dropping all unverified descriptors
right then. The bug was hidden because we would immediately
fetch a directory from another dirserver, which would include the
descriptors we just dropped.
- When we're connecting to an OR and he's got a different nickname/key
than we were expecting, only complain loudly if we're an OP or a
dirserver. Complaining loudly to the OR admins just confuses them.
- Tie MAX_DIR_SIZE to MAX_BUF_SIZE, so now directory sizes won't get
artificially capped at 500kB.
Changes in version 0.0.9.8 - 2005-04-07
o Bugfixes on 0.0.9.x:
- We have a bug that I haven't found yet. Sometimes, very rarely,
cpuworkers get stuck in the 'busy' state, even though the cpuworker
thinks of itself as idle. This meant that no new circuits ever got
established. Here's a workaround to kill any cpuworker that's been
busy for more than 100 seconds.
Changes in version 0.1.0.2-rc - 2005-04-01
o Bugfixes on 0.1.0.1-rc:
- Fixes on reachability detection:
- Don't check for reachability while hibernating.
- If ORPort is reachable but DirPort isn't, still publish the
descriptor, but zero out DirPort until it's found reachable.
- When building testing circs for ORPort testing, use only
high-bandwidth nodes, so fewer circuits fail.
- Complain about unreachable ORPort separately from unreachable
DirPort, so the user knows what's going on.
- Make sure we only conclude ORPort reachability if we didn't
initiate the conn. Otherwise we could falsely conclude that
we're reachable just because we connected to the guy earlier
and he used that same pipe to extend to us.
- Authdirservers shouldn't do ORPort reachability detection,
since they're in clique mode, so it will be rare to find a
server not already connected to them.
- When building testing circuits, always pick middle hops running
Tor 0.0.9.7, so we avoid the "can't extend to unknown routers"
bug. (This is a kludge; it will go away when 0.0.9.x becomes
obsolete.)
- When we decide we're reachable, actually publish our descriptor
right then.
- Fix bug in redirectstream in the controller.
- Fix the state descriptor strings so logs don't claim edge streams
are in a different state than they actually are.
- Use recent libevent features when possible (this only really affects
win32 and osx right now, because the new libevent with these
features hasn't been released yet). Add code to suppress spurious
libevent log msgs.
- Prevent possible segfault in connection_close_unattached_ap().
- Fix newlines on torrc in win32.
- Improve error msgs when tor-resolve fails.
o Improvements on 0.0.9.x:
- New experimental script tor/contrib/ExerciseServer.py (needs more
work) that uses the controller interface to build circuits and
fetch pages over them. This will help us bootstrap servers that
have lots of capacity but haven't noticed it yet.
- New experimental script tor/contrib/PathDemo.py (needs more work)
that uses the controller interface to let you choose whole paths
via addresses like
"<hostname>.<path,separated by dots>.<length of path>.path"
- When we've connected to an OR and handshaked but didn't like
the result, we were closing the conn without sending destroy
cells back for pending circuits. Now send those destroys.
Changes in version 0.0.9.7 - 2005-04-01
o Bugfixes on 0.0.9.x:
- Fix another race crash bug (thanks to Glenn Fink for reporting).
- Compare identity to identity, not to nickname, when extending to
a router not already in the directory. This was preventing us from
extending to unknown routers. Oops.
- Make sure to create OS X Tor user in <500 range, so we aren't
creating actual system users.
- Note where connection-that-hasn't-sent-end was marked, and fix
a few really loud instances of this harmless bug (it's fixed more
in 0.1.0.x).
Changes in version 0.1.0.1-rc - 2005-03-28
o New features:
- Add reachability testing. Your Tor server will automatically try
to see if its ORPort and DirPort are reachable from the outside,
and it won't upload its descriptor until it decides they are.
- Handle unavailable hidden services better. Handle slow or busy
hidden services better.
- Add support for CONNECTing through https proxies, with "HttpsProxy"
config option.
- New exit policy: accept most low-numbered ports, rather than
rejecting most low-numbered ports.
- More Tor controller support (still experimental). See
http://tor.eff.org/doc/control-spec.txt for all the new features,
including signals to emulate unix signals from any platform;
redirectstream; extendcircuit; mapaddress; getinfo; postdescriptor;
closestream; closecircuit; etc.
- Make nt services work and start on startup on win32 (based on
patch by Matt Edman).
- Add a new AddressMap config directive to rewrite incoming socks
addresses. This lets you, for example, declare an implicit
required exit node for certain sites.
- Add a new TrackHostExits config directive to trigger addressmaps
for certain incoming socks addresses -- for sites that break when
your exit keeps changing (based on patch by Mike Perry).
- Redo the client-side dns cache so it's just an addressmap too.
- Notice when our IP changes, and reset stats/uptime/reachability.
- When an application is using socks5, give him the whole variety of
potential socks5 responses (connect refused, host unreachable, etc),
rather than just "success" or "failure".
- A more sane version numbering system. See
http://tor.eff.org/cvs/tor/doc/version-spec.txt for details.
- New contributed script "exitlist": a simple python script to
parse directories and find Tor nodes that exit to listed
addresses/ports.
- New contributed script "privoxy-tor-toggle" to toggle whether
Privoxy uses Tor. Seems to be configured for Debian by default.
- Report HTTP reasons to client when getting a response from directory
servers -- so you can actually know what went wrong.
- New config option MaxAdvertisedBandwidth which lets you advertise
a low bandwidthrate (to not attract as many circuits) while still
allowing a higher bandwidthrate in reality.
o Robustness/stability fixes:
- Make Tor use Niels Provos's libevent instead of its current
poll-but-sometimes-select mess. This will let us use faster async
cores (like epoll, kpoll, and /dev/poll), and hopefully work better
on Windows too.
- pthread support now too. This was forced because when we forked,
we ended up wasting a lot of duplicate ram over time. Also switch
to foo_r versions of some library calls to allow reentry and
threadsafeness.
- Better handling for heterogeneous / unreliable nodes:
- Annotate circuits w/ whether they aim to contain high uptime nodes
and/or high capacity nodes. When building circuits, choose
appropriate nodes.
- This means that every single node in an intro rend circuit,
not just the last one, will have a minimum uptime.
- New config option LongLivedPorts to indicate application streams
that will want high uptime circuits.
- Servers reset uptime when a dir fetch entirely fails. This
hopefully reflects stability of the server's network connectivity.
- If somebody starts his tor server in Jan 2004 and then fixes his
clock, don't make his published uptime be a year.
- Reset published uptime when you wake up from hibernation.
- Introduce a notion of 'internal' circs, which are chosen without
regard to the exit policy of the last hop. Intro and rendezvous
circs must be internal circs, to avoid leaking information. Resolve
and connect streams can use internal circs if they want.
- New circuit pooling algorithm: make sure to have enough circs around
to satisfy any predicted ports, and also make sure to have 2 internal
circs around if we've required internal circs lately (and with high
uptime if we've seen that lately too).
- Split NewCircuitPeriod option into NewCircuitPeriod (30 secs),
which describes how often we retry making new circuits if current
ones are dirty, and MaxCircuitDirtiness (10 mins), which describes
how long we're willing to make use of an already-dirty circuit.
- Cannibalize GENERAL circs to be C_REND, C_INTRO, S_INTRO, and S_REND
circ as necessary, if there are any completed ones lying around
when we try to launch one.
- Make hidden services try to establish a rendezvous for 30 seconds,
rather than for n (where n=3) attempts to build a circuit.
- Change SHUTDOWN_WAIT_LENGTH from a fixed 30 secs to a config option
"ShutdownWaitLength".
- Try to be more zealous about calling connection_edge_end when
things go bad with edge conns in connection.c.
- Revise tor-spec to add more/better stream end reasons.
- Revise all calls to connection_edge_end to avoid sending "misc",
and to take errno into account where possible.
o Bug fixes:
- Fix a race condition that can trigger an assert, when we have a
pending create cell and an OR connection fails right then.
- Fix several double-mark-for-close bugs, e.g. where we were finding
a conn for a cell even if that conn is already marked for close.
- Make sequence of log messages when starting on win32 with no config
file more reasonable.
- When choosing an exit node for a new non-internal circ, don't take
into account whether it'll be useful for any pending x.onion
addresses -- it won't.
- Turn addr_policy_compare from a tristate to a quadstate; this should
help address our "Ah, you allow 1.2.3.4:80. You are a good choice
for google.com" problem.
- Make "platform" string in descriptor more accurate for Win32 servers,
so it's not just "unknown platform".
- Fix an edge case in parsing config options (thanks weasel).
If they say "--" on the commandline, it's not an option.
- Reject odd-looking addresses at the client (e.g. addresses that
contain a colon), rather than having the server drop them because
they're malformed.
- tor-resolve requests were ignoring .exit if there was a working circuit
they could use instead.
- REUSEADDR on normal platforms means you can rebind to the port
right after somebody else has let it go. But REUSEADDR on win32
means to let you bind to the port _even when somebody else
already has it bound_! So, don't do that on Win32.
- Change version parsing logic: a version is "obsolete" if it is not
recommended and (1) there is a newer recommended version in the
same series, or (2) there are no recommended versions in the same
series, but there are some recommended versions in a newer series.
A version is "new" if it is newer than any recommended version in
the same series.
- Stop most cases of hanging up on a socks connection without sending
the socks reject.
o Helpful fixes:
- Require BandwidthRate to be at least 20kB/s for servers.
- When a dirserver causes you to give a warn, mention which dirserver
it was.
- New config option DirAllowPrivateAddresses for authdirservers.
Now by default they refuse router descriptors that have non-IP or
private-IP addresses.
- Stop publishing socksport in the directory, since it's not
actually meant to be public. For compatibility, publish a 0 there
for now.
- Change DirFetchPeriod/StatusFetchPeriod to have a special "Be
smart" value, that is low for servers and high for clients.
- If our clock jumps forward by 100 seconds or more, assume something
has gone wrong with our network and abandon all not-yet-used circs.
- Warn when exit policy implicitly allows local addresses.
- If we get an incredibly skewed timestamp from a dirserver mirror
that isn't a verified OR, don't warn -- it's probably him that's
wrong.
- Since we ship our own Privoxy on OS X, tweak it so it doesn't write
cookies to disk and doesn't log each web request to disk. (Thanks
to Brett Carrington for pointing this out.)
- When a client asks us for a dir mirror and we don't have one,
launch an attempt to get a fresh one.
- If we're hibernating and we get a SIGINT, exit immediately.
- Add --with-dmalloc ./configure option, to track memory leaks.
- And try to free all memory on closing, so we can detect what
we're leaking.
- Cache local dns resolves correctly even when they're .exit
addresses.
- Give a better warning when some other server advertises an
ORPort that is actually an apache running ssl.
- Add "opt hibernating 1" to server descriptor to make it clearer
whether the server is hibernating.
Changes in version 0.0.9.6 - 2005-03-24
o Bugfixes on 0.0.9.x (crashes and asserts):
- Add new end stream reasons to maintenance branch. Fix bug where
reason (8) could trigger an assert. Prevent bug from recurring.
- Apparently win32 stat wants paths to not end with a slash.
- Fix assert triggers in assert_cpath_layer_ok(), where we were
blowing away the circuit that conn->cpath_layer points to, then
checking to see if the circ is well-formed. Backport check to make
sure we dont use the cpath on a closed connection.
- Prevent circuit_resume_edge_reading_helper() from trying to package
inbufs for marked-for-close streams.
- Don't crash on hup if your options->address has become unresolvable.
- Some systems (like OS X) sometimes accept() a connection and tell
you the remote host is 0.0.0.0:0. If this happens, due to some
other mis-features, we get confused; so refuse the conn for now.
o Bugfixes on 0.0.9.x (other):
- Fix harmless but scary "Unrecognized content encoding" warn message.
- Add new stream error reason: TORPROTOCOL reason means "you are not
speaking a version of Tor I understand; say bye-bye to your stream."
- Be willing to cache directories from up to ROUTER_MAX_AGE seconds
into the future, now that we are more tolerant of skew. This
resolves a bug where a Tor server would refuse to cache a directory
because all the directories it gets are too far in the future;
yet the Tor server never logs any complaints about clock skew.
- Mac packaging magic: make man pages useable, and do not overwrite
existing torrc files.
- Make OS X log happily to /var/log/tor/tor.log
Changes in version 0.0.9.5 - 2005-02-22
o Bugfixes on 0.0.9.x:
- Fix an assert race at exit nodes when resolve requests fail.
- Stop picking unverified dir mirrors--it only leads to misery.
- Patch from Matt Edman to make NT services work better. Service
support is still not compiled into the executable by default.
- Patch from Dmitri Bely so the Tor service runs better under
the win32 SYSTEM account.
- Make tor-resolve actually work (?) on Win32.
- Fix a sign bug when getrlimit claims to have 4+ billion
file descriptors available.
- Stop refusing to start when bandwidthburst == bandwidthrate.
- When create cells have been on the onion queue more than five
seconds, just send back a destroy and take them off the list.
Changes in version 0.0.9.4 - 2005-02-03
o Bugfixes on 0.0.9:
- Fix an assert bug that took down most of our servers: when
a server claims to have 1 GB of bandwidthburst, don't
freak out.
- Don't crash as badly if we have spawned the max allowed number
of dnsworkers, or we're out of file descriptors.
- Block more file-sharing ports in the default exit policy.
- MaxConn is now automatically set to the hard limit of max
file descriptors we're allowed (ulimit -n), minus a few for
logs, etc.
- Give a clearer message when servers need to raise their
ulimit -n when they start running out of file descriptors.
- SGI Compatibility patches from Jan Schaumann.
- Tolerate a corrupt cached directory better.
- When a dirserver hasn't approved your server, list which one.
- Go into soft hibernation after 95% of the bandwidth is used,
not 99%. This is especially important for daily hibernators who
have a small accounting max. Hopefully it will result in fewer
cut connections when the hard hibernation starts.
- Load-balance better when using servers that claim more than
800kB/s of capacity.
- Make NT services work (experimental, only used if compiled in).
Changes in version 0.0.9.3 - 2005-01-21
o Bugfixes on 0.0.9:
- Backport the cpu use fixes from main branch, so busy servers won't
need as much processor time.
- Work better when we go offline and then come back, or when we
run Tor at boot before the network is up. We do this by
optimistically trying to fetch a new directory whenever an
application request comes in and we think we're offline -- the
human is hopefully a good measure of when the network is back.
- Backport some minimal hidserv bugfixes: keep rend circuits open as
long as you keep using them; actually publish hidserv descriptors
shortly after they change, rather than waiting 20-40 minutes.
- Enable Mac startup script by default.
- Fix duplicate dns_cancel_pending_resolve reported by Giorgos Pallas.
- When you update AllowUnverifiedNodes or FirewallPorts via the
controller's setconf feature, we were always appending, never
resetting.
- When you update HiddenServiceDir via setconf, it was screwing up
the order of reading the lines, making it fail.
- Do not rewrite a cached directory back to the cache; otherwise we
will think it is recent and not fetch a newer one on startup.
- Workaround for webservers that lie about Content-Encoding: Tor
now tries to autodetect compressed directories and compression
itself. This lets us Proxypass dir fetches through apache.
Changes in version 0.0.9.2 - 2005-01-04
o Bugfixes on 0.0.9 (crashes and asserts):
- Fix an assert on startup when the disk is full and you're logging
to a file.
- If you do socks4 with an IP of 0.0.0.x but *don't* provide a socks4a
style address, then we'd crash.
- Fix an assert trigger when the running-routers string we get from
a dirserver is broken.
- Make worker threads start and run on win32. Now win32 servers
may work better.
- Bandaid (not actually fix, but now it doesn't crash) an assert
where the dns worker dies mysteriously and the main Tor process
doesn't remember anything about the address it was resolving.
o Bugfixes on 0.0.9 (Win32):
- Workaround for brain-damaged __FILE__ handling on MSVC: keep Nick's
name out of the warning/assert messages.
- Fix a superficial "unhandled error on read" bug on win32.
- The win32 installer no longer requires a click-through for our
license, since our Free Software license grants rights but does not
take any away.
- Win32: When connecting to a dirserver fails, try another one
immediately. (This was already working for non-win32 Tors.)
- Stop trying to parse $HOME on win32 when hunting for default
DataDirectory.
- Make tor-resolve.c work on win32 by calling network_init().
o Bugfixes on 0.0.9 (other):
- Make 0.0.9.x build on Solaris again.
- Due to a fencepost error, we were blowing away the \n when reporting
confvalue items in the controller. So asking for multiple config
values at once couldn't work.
- When listing circuits that are pending on an opening OR connection,
if we're an OR we were listing circuits that *end* at us as
being pending on every listener, dns/cpu worker, etc. Stop that.
- Dirservers were failing to create 'running-routers' or 'directory'
strings if we had more than some threshold of routers. Fix them so
they can handle any number of routers.
- Fix a superficial "Duplicate mark for close" bug.
- Stop checking for clock skew for OR connections, even for servers.
- Fix a fencepost error that was chopping off the last letter of any
nickname that is the maximum allowed nickname length.
- Update URLs in log messages so they point to the new website.
- Fix a potential problem in mangling server private keys while
writing to disk (not triggered yet, as far as we know).
- Include the licenses for other free software we include in Tor,
now that we're shipping binary distributions more regularly.
Changes in version 0.0.9.1 - 2004-12-15
o Bugfixes on 0.0.9:
- Make hibernation actually work.
- Make HashedControlPassword config option work.
- When we're reporting event circuit status to a controller,
don't use the stream status code.
Changes in version 0.0.9 - 2004-12-12
o Cleanups:
- Clean up manpage and torrc.sample file.
- Clean up severities and text of log warnings.
o Mistakes:
- Make servers trigger an assert when they enter hibernation.
Changes in version 0.0.9rc7 - 2004-12-08
o Bugfixes on 0.0.9rc:
- Fix a stack-trashing crash when an exit node begins hibernating.
- Avoid looking at unallocated memory while considering which
ports we need to build circuits to cover.
- Stop a sigpipe: when an 'end' cell races with eof from the app,
we shouldn't hold-open-until-flush if the eof arrived first.
- Fix a bug with init_cookie_authentication() in the controller.
- When recommending new-format log lines, if the upper bound is
LOG_ERR, leave it implicit.
o Bugfixes on 0.0.8.1:
- Fix a whole slew of memory leaks.
- Fix isspace() and friends so they still make Solaris happy
but also so they don't trigger asserts on win32.
- Fix parse_iso_time on platforms without strptime (eg win32).
- win32: tolerate extra "readable" events better.
- win32: when being multithreaded, leave parent fdarray open.
- Make unit tests work on win32.
Changes in version 0.0.9rc6 - 2004-12-06
o Bugfixes on 0.0.9pre:
- Clean up some more integer underflow opportunities (not exploitable
we think).
- While hibernating, hup should not regrow our listeners.
- Send an end to the streams we close when we hibernate, rather
than just chopping them off.
- React to eof immediately on non-open edge connections.
o Bugfixes on 0.0.8.1:
- Calculate timeout for waiting for a connected cell from the time
we sent the begin cell, not from the time the stream started. If
it took a long time to establish the circuit, we would time out
right after sending the begin cell.
- Fix router_compare_addr_to_addr_policy: it was not treating a port
of * as always matching, so we were picking reject *:* nodes as
exit nodes too. Oops.
o Features:
- New circuit building strategy: keep a list of ports that we've
used in the past 6 hours, and always try to have 2 circuits open
or on the way that will handle each such port. Seed us with port
80 so web users won't complain that Tor is "slow to start up".
- Make kill -USR1 dump more useful stats about circuits.
- When warning about retrying or giving up, print the address, so
the user knows which one it's talking about.
- If you haven't used a clean circuit in an hour, throw it away,
just to be on the safe side. (This means after 6 hours a totally
unused Tor client will have no circuits open.)
Changes in version 0.0.9rc5 - 2004-12-01
o Bugfixes on 0.0.8.1:
- Disallow NDEBUG. We don't ever want anybody to turn off debug.
- Let resolve conns retry/expire also, rather than sticking around
forever.
- If we are using select, make sure we stay within FD_SETSIZE.
o Bugfixes on 0.0.9pre:
- Fix integer underflow in tor_vsnprintf() that may be exploitable,
but doesn't seem to be currently; thanks to Ilja van Sprundel for
finding it.
- If anybody set DirFetchPostPeriod, give them StatusFetchPeriod
instead. Impose minima and maxima for all *Period options; impose
even tighter maxima for fetching if we are a caching dirserver.
Clip rather than rejecting.
- Fetch cached running-routers from servers that serve it (that is,
authdirservers and servers running 0.0.9rc5-cvs or later.)
o Features:
- Accept *:706 (silc) in default exit policy.
- Implement new versioning format for post 0.1.
- Support "foo.nickname.exit" addresses, to let Alice request the
address "foo" as viewed by exit node "nickname". Based on a patch
by Geoff Goodell.
- Make tor --version --version dump the cvs Id of every file.
Changes in version 0.0.9rc4 - 2004-11-28
o Bugfixes on 0.0.8.1:
- Make windows sockets actually non-blocking (oops), and handle
win32 socket errors better.
o Bugfixes on 0.0.9rc1:
- Actually catch the -USR2 signal.
Changes in version 0.0.9rc3 - 2004-11-25
o Bugfixes on 0.0.8.1:
- Flush the log file descriptor after we print "Tor opening log file",
so we don't see those messages days later.
o Bugfixes on 0.0.9rc1:
- Make tor-resolve work again.
- Avoid infinite loop in tor-resolve if tor hangs up on it.
- Fix an assert trigger for clients/servers handling resolves.
Changes in version 0.0.9rc2 - 2004-11-24
o Bugfixes on 0.0.9rc1:
- I broke socks5 support while fixing the eof bug.
- Allow unitless bandwidths and intervals; they default to bytes
and seconds.
- New servers don't start out hibernating; they are active until
they run out of bytes, so they have a better estimate of how
long it takes, and so their operators can know they're working.
Changes in version 0.0.9rc1 - 2004-11-23
o Bugfixes on 0.0.8.1:
- Finally fix a bug that's been plaguing us for a year:
With high load, circuit package window was reaching 0. Whenever
we got a circuit-level sendme, we were reading a lot on each
socket, but only writing out a bit. So we would eventually reach
eof. This would be noticed and acted on even when there were still
bytes sitting in the inbuf.
- When poll() is interrupted, we shouldn't believe the revents values.
o Bugfixes on 0.0.9pre6:
- Fix hibernate bug that caused pre6 to be broken.
- Don't keep rephist info for routers that haven't had activity for
24 hours. (This matters now that clients have keys, since we track
them too.)
- Never call close_temp_logs while validating log options.
- Fix backslash-escaping on tor.sh.in and torctl.in.
o Features:
- Implement weekly/monthly/daily accounting: now you specify your
hibernation properties by
AccountingMax N bytes|KB|MB|GB|TB
AccountingStart day|week|month [day] HH:MM
Defaults to "month 1 0:00".
- Let bandwidth and interval config options be specified as 5 bytes,
kb, kilobytes, etc; and as seconds, minutes, hours, days, weeks.
- kill -USR2 now moves all logs to loglevel debug (kill -HUP to
get back to normal.)
- If your requested entry or exit node has advertised bandwidth 0,
pick it anyway.
- Be more greedy about filling up relay cells -- we try reading again
once we've processed the stuff we read, in case enough has arrived
to fill the last cell completely.
- Apply NT service patch from Osamu Fujino. Still needs more work.
Changes in version 0.0.9pre6 - 2004-11-15
o Bugfixes on 0.0.8.1:
- Fix assert failure on malformed socks4a requests.
- Use identity comparison, not nickname comparison, to choose which
half of circuit-ID-space each side gets to use. This is needed
because sometimes we think of a router as a nickname, and sometimes
as a hex ID, and we can't predict what the other side will do.
- Catch and ignore SIGXFSZ signals when log files exceed 2GB; our
write() call will fail and we handle it there.
- Add a FAST_SMARTLIST define to optionally inline smartlist_get
and smartlist_len, which are two major profiling offenders.
o Bugfixes on 0.0.9pre5:
- Fix a bug in read_all that was corrupting config files on windows.
- When we're raising the max number of open file descriptors to
'unlimited', don't log that we just raised it to '-1'.
- Include event code with events, as required by control-spec.txt.
- Don't give a fingerprint when clients do --list-fingerprint:
it's misleading, because it will never be the same again.
- Stop using strlcpy in tor_strndup, since it was slowing us
down a lot.
- Remove warn on startup about missing cached-directory file.
- Make kill -USR1 work again.
- Hibernate if we start tor during the "wait for wakeup-time" phase
of an accounting interval. Log our hibernation plans better.
- Authoritative dirservers now also cache their directory, so they
have it on start-up.
o Features:
- Fetch running-routers; cache running-routers; compress
running-routers; serve compressed running-routers.z
- Add NSI installer script contributed by J Doe.
- Commit VC6 and VC7 workspace/project files.
- Commit a tor.spec for making RPM files, with help from jbash.
- Add contrib/torctl.in contributed by Glenn Fink.
- Implement the control-spec's SAVECONF command, to write your
configuration to torrc.
- Get cookie authentication for the controller closer to working.
- Include control-spec.txt in the tarball.
- When set_conf changes our server descriptor, upload a new copy.
But don't upload it too often if there are frequent changes.
- Document authentication config in man page, and document signals
we catch.
- Clean up confusing parts of man page and torrc.sample.
- Make expand_filename handle ~ and ~username.
- Use autoconf to enable largefile support where necessary. Use
ftello where available, since ftell can fail at 2GB.
- Distinguish between TOR_TLS_CLOSE and TOR_TLS_ERROR, so we can
log more informatively.
- Give a slightly more useful output for "tor -h".
- Refuse application socks connections to port 0.
- Check clock skew for verified servers, but allow unverified
servers and clients to have any clock skew.
- Break DirFetchPostPeriod into:
- DirFetchPeriod for fetching full directory,
- StatusFetchPeriod for fetching running-routers,
- DirPostPeriod for posting server descriptor,
- RendPostPeriod for posting hidden service descriptors.
- Make sure the hidden service descriptors are at a random offset
from each other, to hinder linkability.
Changes in version 0.0.9pre5 - 2004-11-09
o Bugfixes on 0.0.9pre4:
- Fix a seg fault in unit tests (doesn't affect main program).
- Fix an assert bug where a hidden service provider would fail if
the first hop of his rendezvous circuit was down.
- Hidden service operators now correctly handle version 1 style
INTRODUCE1 cells (nobody generates them still, so not a critical
bug).
- If do_hup fails, actually notice.
- Handle more errnos from accept() without closing the listener.
Some OpenBSD machines were closing their listeners because
they ran out of file descriptors.
- Send resolve cells to exit routers that are running a new
enough version of the resolve code to work right.
- Better handling of winsock includes on non-MSV win32 compilers.
- Some people had wrapped their tor client/server in a script
that would restart it whenever it died. This did not play well
with our "shut down if your version is obsolete" code. Now people
don't fetch a new directory if their local cached version is
recent enough.
- Make our autogen.sh work on ksh as well as bash.
o Major Features:
- Hibernation: New config option "AccountingMaxKB" lets you
set how many KBytes per month you want to allow your server to
consume. Rather than spreading those bytes out evenly over the
month, we instead hibernate for some of the month and pop up
at a deterministic time, work until the bytes are consumed, then
hibernate again. Config option "MonthlyAccountingStart" lets you
specify which day of the month your billing cycle starts on.
- Control interface: a separate program can now talk to your
client/server over a socket, and get/set config options, receive
notifications of circuits and streams starting/finishing/dying,
bandwidth used, etc. The next step is to get some GUIs working.
Let us know if you want to help out. See doc/control-spec.txt .
- Ship a contrib/tor-control.py as an example script to interact
with the control port.
- "tor --hash-password zzyxz" will output a salted password for
use in authenticating to the control interface.
- New log format in config:
"Log minsev[-maxsev] stdout|stderr|syslog" or
"Log minsev[-maxsev] file /var/foo"
o Minor Features:
- DirPolicy config option, to let people reject incoming addresses
from their dirserver.
- "tor --list-fingerprint" will list your identity key fingerprint
and then exit.
- Add "pass" target for RedirectExit, to make it easier to break
out of a sequence of RedirectExit rules.
- Clients now generate a TLS cert too, in preparation for having
them act more like real nodes.
- Ship src/win32/ in the tarball, so people can use it to build.
- Make old win32 fall back to CWD if SHGetSpecialFolderLocation
is broken.
- New "router-status" line in directory, to better bind each verified
nickname to its identity key.
- Deprecate unofficial config option abbreviations, and abbreviations
not on the command line.
- Add a pure-C tor-resolve implementation.
- Use getrlimit and friends to ensure we can reach MaxConn (currently
1024) file descriptors.
o Code security improvements, inspired by Ilja:
- Replace sprintf with snprintf. (I think they were all safe, but
hey.)
- Replace strcpy/strncpy with strlcpy in more places.
- Avoid strcat; use snprintf or strlcat instead.
- snprintf wrapper with consistent (though not C99) overflow behavior.
Changes in version 0.0.9pre4 - 2004-10-17
o Bugfixes on 0.0.9pre3:
- If the server doesn't specify an exit policy, use the real default
exit policy, not reject *:*.
- Ignore fascistfirewall when uploading/downloading hidden service
descriptors, since we go through Tor for those; and when using
an HttpProxy, since we assume it can reach them all.
- When looking for an authoritative dirserver, use only the ones
configured at boot. Don't bother looking in the directory.
- The rest of the fix for get_default_conf_file() on older win32.
- Make 'Routerfile' config option obsolete.
o Features:
- New 'MyFamily nick1,...' config option for a server to
specify other servers that shouldn't be used in the same circuit
with it. Only believed if nick1 also specifies us.
- New 'NodeFamily nick1,nick2,...' config option for a client to
specify nodes that it doesn't want to use in the same circuit.
- New 'Redirectexit pattern address:port' config option for a
server to redirect exit connections, e.g. to a local squid.
Changes in version 0.0.9pre3 - 2004-10-13
o Bugfixes on 0.0.8.1:
- Better torrc example lines for dirbindaddress and orbindaddress.
- Improved bounds checking on parsed ints (e.g. config options and
the ones we find in directories.)
- Better handling of size_t vs int, so we're more robust on 64
bit platforms.
- Fix the rest of the bug where a newly started OR would appear
as unverified even after we've added his fingerprint and hupped
the dirserver.
- Fix a bug from 0.0.7: when read() failed on a stream, we would
close it without sending back an end. So 'connection refused'
would simply be ignored and the user would get no response.
o Bugfixes on 0.0.9pre2:
- Serving the cached-on-disk directory to people is bad. We now
provide no directory until we've fetched a fresh one.
- Workaround for bug on windows where cached-directories get crlf
corruption.
- Make get_default_conf_file() work on older windows too.
- If we write a *:* exit policy line in the descriptor, don't write
any more exit policy lines.
o Features:
- Use only 0.0.9pre1 and later servers for resolve cells.
- Make the dirservers file obsolete.
- Include a dir-signing-key token in directories to tell the
parsing entity which key is being used to sign.
- Remove the built-in bulky default dirservers string.
- New config option "Dirserver %s:%d [fingerprint]", which can be
repeated as many times as needed. If no dirservers specified,
default to moria1,moria2,tor26.
- Make moria2 advertise a dirport of 80, so people behind firewalls
will be able to get a directory.
- Http proxy support
- Dirservers translate requests for http://%s:%d/x to /x
- You can specify "HttpProxy %s[:%d]" and all dir fetches will
be routed through this host.
- Clients ask for /tor/x rather than /x for new enough dirservers.
This way we can one day coexist peacefully with apache.
- Clients specify a "Host: %s%d" http header, to be compatible
with more proxies, and so running squid on an exit node can work.
Changes in version 0.0.8.1 - 2004-10-13
o Bugfixes:
- Fix a seg fault that can be triggered remotely for Tor
clients/servers with an open dirport.
- Fix a rare assert trigger, where routerinfos for entries in
our cpath would expire while we're building the path.
- Fix a bug in OutboundBindAddress so it (hopefully) works.
- Fix a rare seg fault for people running hidden services on
intermittent connections.
- Fix a bug in parsing opt keywords with objects.
- Fix a stale pointer assert bug when a stream detaches and
reattaches.
- Fix a string format vulnerability (probably not exploitable)
in reporting stats locally.
- Fix an assert trigger: sometimes launching circuits can fail
immediately, e.g. because too many circuits have failed recently.
- Fix a compile warning on 64 bit platforms.
Changes in version 0.0.9pre2 - 2004-10-03
o Bugfixes:
- Make fetching a cached directory work for 64-bit platforms too.
- Make zlib.h a required header, not an optional header.
Changes in version 0.0.9pre1 - 2004-10-01
o Bugfixes:
- Stop using separate defaults for no-config-file and
empty-config-file. Now you have to explicitly turn off SocksPort,
if you don't want it open.
- Fix a bug in OutboundBindAddress so it (hopefully) works.
- Improve man page to mention more of the 0.0.8 features.
- Fix a rare seg fault for people running hidden services on
intermittent connections.
- Change our file IO stuff (especially wrt OpenSSL) so win32 is
happier.
- Fix more dns related bugs: send back resolve_failed and end cells
more reliably when the resolve fails, rather than closing the
circuit and then trying to send the cell. Also attach dummy resolve
connections to a circuit *before* calling dns_resolve(), to fix
a bug where cached answers would never be sent in RESOLVED cells.
- When we run out of disk space, or other log writing error, don't
crash. Just stop logging to that log and continue.
- We were starting to daemonize before we opened our logs, so if
there were any problems opening logs, we would complain to stderr,
which wouldn't work, and then mysteriously exit.
- Fix a rare bug where sometimes a verified OR would connect to us
before he'd uploaded his descriptor, which would cause us to
assign conn->nickname as though he's unverified. Now we look through
the fingerprint list to see if he's there.
- Fix a rare assert trigger, where routerinfos for entries in
our cpath would expire while we're building the path.
o Features:
- Clients can ask dirservers for /dir.z to get a compressed version
of the directory. Only works for servers running 0.0.9, of course.
- Make clients cache directories and use them to seed their router
lists at startup. This means clients have a datadir again.
- Configuration infrastructure support for warning on obsolete
options.
- Respond to content-encoding headers by trying to uncompress as
appropriate.
- Reply with a deflated directory when a client asks for "dir.z".
We could use allow-encodings instead, but allow-encodings isn't
specified in HTTP 1.0.
- Raise the max dns workers from 50 to 100.
- Discourage people from setting their dirfetchpostperiod more often
than once per minute.
- Protect dirservers from overzealous descriptor uploading -- wait
10 seconds after directory gets dirty, before regenerating.
Changes in version 0.0.8 - 2004-08-25
o Port it to SunOS 5.9 / Athena
Changes in version 0.0.8rc2 - 2004-08-20
o Make it compile on cygwin again.
o When picking unverified routers, skip those with low uptime and/or
low bandwidth, depending on what properties you care about.
Changes in version 0.0.8rc1 - 2004-08-18
o Changes from 0.0.7.3:
- Bugfixes:
- Fix assert triggers: if the other side returns an address 0.0.0.0,
don't put it into the client dns cache.
- If a begin failed due to exit policy, but we believe the IP address
should have been allowed, switch that router to exitpolicy reject *:*
until we get our next directory.
- Features:
- Clients choose nodes proportional to advertised bandwidth.
- Avoid using nodes with low uptime as introduction points.
- Handle servers with dynamic IP addresses: don't replace
options->Address with the resolved one at startup, and
detect our address right before we make a routerinfo each time.
- 'FascistFirewall' option to pick dirservers and ORs on specific
ports; plus 'FirewallPorts' config option to tell FascistFirewall
which ports are open. (Defaults to 80,443)
- Be more aggressive about trying to make circuits when the network
has changed (e.g. when you unsuspend your laptop).
- Check for time skew on http headers; report date in response to
"GET /".
- If the entrynode config line has only one node, don't pick it as
an exitnode.
- Add strict{entry|exit}nodes config options. If set to 1, then
we refuse to build circuits that don't include the specified entry
or exit nodes.
- OutboundBindAddress config option, to bind to a specific
IP address for outgoing connect()s.
- End truncated log entries (e.g. directories) with "[truncated]".
o Patches to 0.0.8preX:
- Bugfixes:
- Patches to compile and run on win32 again (maybe)?
- Fix crash when looking for ~/.torrc with no $HOME set.
- Fix a race bug in the unit tests.
- Handle verified/unverified name collisions better when new
routerinfo's arrive in a directory.
- Sometimes routers were getting entered into the stats before
we'd assigned their identity_digest. Oops.
- Only pick and establish intro points after we've gotten a
directory.
- Features:
- AllowUnverifiedNodes config option to let circuits choose no-name
routers in entry,middle,exit,introduction,rendezvous positions.
Allow middle and rendezvous positions by default.
- Add a man page for tor-resolve.
Changes in version 0.0.7.3 - 2004-08-12
o Stop dnsworkers from triggering an assert failure when you
ask them to resolve the host "".
Changes in version 0.0.8pre3 - 2004-08-09
o Changes from 0.0.7.2:
- Allow multiple ORs with same nickname in routerlist -- now when
people give us one identity key for a nickname, then later
another, we don't constantly complain until the first expires.
- Remember used bandwidth (both in and out), and publish 15-minute
snapshots for the past day into our descriptor.
- You can now fetch $DIRURL/running-routers to get just the
running-routers line, not the whole descriptor list. (But
clients don't use this yet.)
- When people mistakenly use Tor as an http proxy, point them
at the tor-doc.html rather than the INSTALL.
- Remove our mostly unused -- and broken -- hex_encode()
function. Use base16_encode() instead. (Thanks to Timo Lindfors
for pointing out this bug.)
- Rotate onion keys every 12 hours, not every 2 hours, so we have
fewer problems with people using the wrong key.
- Change the default exit policy to reject the default edonkey,
kazaa, gnutella ports.
- Add replace_file() to util.[ch] to handle win32's rename().
o Changes from 0.0.8preX:
- Fix two bugs in saving onion keys to disk when rotating, so
hopefully we'll get fewer people using old onion keys.
- Fix an assert error that was making SocksPolicy not work.
- Be willing to expire routers that have an open dirport -- it's
just the authoritative dirservers we want to not forget.
- Reject tor-resolve requests for .onion addresses early, so we
don't build a whole rendezvous circuit and then fail.
- When you're warning a server that he's unverified, don't cry
wolf unpredictably.
- Fix a race condition: don't try to extend onto a connection
that's still handshaking.
- For servers in clique mode, require the conn to be open before
you'll choose it for your path.
- Fix some cosmetic bugs about duplicate mark-for-close, lack of
end relay cell, etc.
- Measure bandwidth capacity over the last 24 hours, not just 12
- Bugfix: authoritative dirservers were making and signing a new
directory for each client, rather than reusing the cached one.
Changes in version 0.0.8pre2 - 2004-08-04
o Changes from 0.0.7.2:
- Security fixes:
- Check directory signature _before_ you decide whether you're
you're running an obsolete version and should exit.
- Check directory signature _before_ you parse the running-routers
list to decide who's running or verified.
- Bugfixes and features:
- Check return value of fclose while writing to disk, so we don't
end up with broken files when servers run out of disk space.
- Log a warning if the user uses an unsafe socks variant, so people
are more likely to learn about privoxy or socat.
- Dirservers now include RFC1123-style dates in the HTTP headers,
which one day we will use to better detect clock skew.
o Changes from 0.0.8pre1:
- Make it compile without warnings again on win32.
- Log a warning if you're running an unverified server, to let you
know you might want to get it verified.
- Only pick a default nickname if you plan to be a server.
Changes in version 0.0.8pre1 - 2004-07-23
o Bugfixes:
- Made our unit tests compile again on OpenBSD 3.5, and tor
itself compile again on OpenBSD on a sparc64.
- We were neglecting milliseconds when logging on win32, so
everything appeared to happen at the beginning of each second.
o Protocol changes:
- 'Extend' relay cell payloads now include the digest of the
intended next hop's identity key. Now we can verify that we're
extending to the right router, and also extend to routers we
hadn't heard of before.
o Features:
- Tor nodes can now act as relays (with an advertised ORPort)
without being manually verified by the dirserver operators.
- Uploaded descriptors of unverified routers are now accepted
by the dirservers, and included in the directory.
- Verified routers are listed by nickname in the running-routers
list; unverified routers are listed as "$<fingerprint>".
- We now use hash-of-identity-key in most places rather than
nickname or addr:port, for improved security/flexibility.
- To avoid Sybil attacks, paths still use only verified servers.
But now we have a chance to play around with hybrid approaches.
- Nodes track bandwidth usage to estimate capacity (not used yet).
- ClientOnly option for nodes that never want to become servers.
- Directory caching.
- "AuthoritativeDir 1" option for the official dirservers.
- Now other nodes (clients and servers) will cache the latest
directory they've pulled down.
- They can enable their DirPort to serve it to others.
- Clients will pull down a directory from any node with an open
DirPort, and check the signature/timestamp correctly.
- Authoritative dirservers now fetch directories from other
authdirservers, to stay better synced.
- Running-routers list tells who's down also, along with noting
if they're verified (listed by nickname) or unverified (listed
by hash-of-key).
- Allow dirservers to serve running-router list separately.
This isn't used yet.
- ORs connect-on-demand to other ORs
- If you get an extend cell to an OR you're not connected to,
connect, handshake, and forward the create cell.
- The authoritative dirservers stay connected to everybody,
and everybody stays connected to 0.0.7 servers, but otherwise
clients/servers expire unused connections after 5 minutes.
- When servers get a sigint, they delay 30 seconds (refusing new
connections) then exit. A second sigint causes immediate exit.
- File and name management:
- Look for .torrc if no CONFDIR "torrc" is found.
- If no datadir is defined, then choose, make, and secure ~/.tor
as datadir.
- If torrc not found, exitpolicy reject *:*.
- Expands ~/ in filenames to $HOME/ (but doesn't yet expand ~arma).
- If no nickname is defined, derive default from hostname.
- Rename secret key files, e.g. identity.key -> secret_id_key,
to discourage people from mailing their identity key to tor-ops.
- Refuse to build a circuit before the directory has arrived --
it won't work anyway, since you won't know the right onion keys
to use.
- Try other dirservers immediately if the one you try is down. This
should tolerate down dirservers better now.
- Parse tor version numbers so we can do an is-newer-than check
rather than an is-in-the-list check.
- New socks command 'resolve', to let us shim gethostbyname()
locally.
- A 'tor_resolve' script to access the socks resolve functionality.
- A new socks-extensions.txt doc file to describe our
interpretation and extensions to the socks protocols.
- Add a ContactInfo option, which gets published in descriptor.
- Publish OR uptime in descriptor (and thus in directory) too.
- Write tor version at the top of each log file
- New docs in the tarball:
- tor-doc.html.
- Document that you should proxy your SSL traffic too.
Changes in version 0.0.7.2 - 2004-07-07
o A better fix for the 0.0.0.0 problem, that will hopefully
eliminate the remaining related assertion failures.
Changes in version 0.0.7.1 - 2004-07-04
o When an address resolves to 0.0.0.0, treat it as a failed resolve,
since internally we use 0.0.0.0 to signify "not yet resolved".
Changes in version 0.0.7 - 2004-06-07
o Updated the man page to reflect the new features.
Changes in version 0.0.7rc2 - 2004-06-06
o Changes from 0.0.7rc1:
- Make it build on Win32 again.
o Changes from 0.0.6.2:
- Rotate dnsworkers and cpuworkers on SIGHUP, so they get new config
settings too.
Changes in version 0.0.7rc1 - 2004-06-02
o Bugfixes:
- On sighup, we were adding another log without removing the first
one. So log messages would get duplicated n times for n sighups.
- Several cases of using a connection after we'd freed it. The
problem was that connections that are pending resolve are in both
the pending_resolve tree, and also the circuit's resolving_streams
list. When you want to remove one, you must remove it from both.
- Fix a double-mark-for-close where an end cell arrived for a
resolving stream, and then the resolve failed.
- Check directory signatures based on name of signer, not on whom
we got the directory from. This will let us cache directories more
easily.
o Features:
- Crank up some of our constants to handle more users.
Changes in version 0.0.7pre1 - 2004-06-02
o Fixes for crashes and other obnoxious bugs:
- Fix an epipe bug: sometimes when directory connections failed
to connect, we would give them a chance to flush before closing
them.
- When we detached from a circuit because of resolvefailed, we
would immediately try the same circuit twice more, and then
give up on the resolve thinking we'd tried three different
exit nodes.
- Limit the number of intro circuits we'll attempt to build for a
hidden service per 15-minute period.
- Check recommended-software string *early*, before actually parsing
the directory. Thus we can detect an obsolete version and exit,
even if the new directory format doesn't parse.
o Fixes for security bugs:
- Remember which nodes are dirservers when you startup, and if a
random OR enables his dirport, don't automatically assume he's
a trusted dirserver.
o Other bugfixes:
- Directory connections were asking the wrong poll socket to
start writing, and not asking themselves to start writing.
- When we detached from a circuit because we sent a begin but
didn't get a connected, we would use it again the first time;
but after that we would correctly switch to a different one.
- Stop warning when the first onion decrypt attempt fails; they
will sometimes legitimately fail now that we rotate keys.
- Override unaligned-access-ok check when $host_cpu is ia64 or
arm. Apparently they allow it but the kernel whines.
- Dirservers try to reconnect periodically too, in case connections
have failed.
- Fix some memory leaks in directory servers.
- Allow backslash in Win32 filenames.
- Made Tor build complain-free on FreeBSD, hopefully without
breaking other BSD builds. We'll see.
o Features:
- Doxygen markup on all functions and global variables.
- Make directory functions update routerlist, not replace it. So
now directory disagreements are not so critical a problem.
- Remove the upper limit on number of descriptors in a dirserver's
directory (not that we were anywhere close).
- Allow multiple logfiles at different severity ranges.
- Allow *BindAddress to specify ":port" rather than setting *Port
separately. Allow multiple instances of each BindAddress config
option, so you can bind to multiple interfaces if you want.
- Allow multiple exit policy lines, which are processed in order.
Now we don't need that huge line with all the commas in it.
- Enable accept/reject policies on SOCKS connections, so you can bind
to 0.0.0.0 but still control who can use your OP.
Changes in version 0.0.6.2 - 2004-05-16
o Our integrity-checking digest was checking only the most recent cell,
not the previous cells like we'd thought.
Thanks to Stefan Mark for finding the flaw!
Changes in version 0.0.6.1 - 2004-05-06
o Fix two bugs in our AES counter-mode implementation (this affected
onion-level stream encryption, but not TLS-level). It turns
out we were doing something much more akin to a 16-character
polyalphabetic cipher. Oops.
Thanks to Stefan Mark for finding the flaw!
o Retire moria3 as a directory server, and add tor26 as a directory
server.
Changes in version 0.0.6 - 2004-05-02
[version bump only]
Changes in version 0.0.6rc4 - 2004-05-01
o Update the built-in dirservers list to use the new directory format
o Fix a rare seg fault: if a node offering a hidden service attempts
to build a circuit to Alice's rendezvous point and fails before it
reaches the last hop, it retries with a different circuit, but
then dies.
o Handle windows socket errors correctly.
Changes in version 0.0.6rc3 - 2004-04-28
o Don't expire non-general excess circuits (if we had enough
circuits open, we were expiring rendezvous circuits -- even
when they had a stream attached. oops.)
o Fetch randomness from /dev/urandom better (not via fopen/fread)
o Better debugging for tls errors
o Some versions of openssl have an SSL_pending function that erroneously
returns bytes when there is a non-application record pending.
o Set Content-Type on the directory and hidserv descriptor.
o Remove IVs from cipher code, since AES-ctr has none.
o Win32 fixes. Tor now compiles on win32 with no warnings/errors.
o We were using an array of length zero in a few places.
o win32's gethostbyname can't resolve an IP to an IP.
o win32's close can't close a socket.
Changes in version 0.0.6rc2 - 2004-04-26
o Fix a bug where we were closing tls connections intermittently.
It turns out openssl keeps its errors around -- so if an error
happens, and you don't ask about it, and then another openssl
operation happens and succeeds, and you ask if there was an error,
it tells you about the first error. Fun fun.
o Fix a bug that's been lurking since 27 may 03 (!)
When passing back a destroy cell, we would use the wrong circ id.
'Mostly harmless', but still worth fixing.
o Since we don't support truncateds much, don't bother sending them;
just close the circ.
o check for <machine/limits.h> so we build on NetBSD again (I hope).
o don't crash if a conn that sent a begin has suddenly lost its circuit
(this was quite rare).
Changes in version 0.0.6rc1 - 2004-04-25
o We now rotate link (tls context) keys and onion keys.
o CREATE cells now include oaep padding, so you can tell
if you decrypted them correctly.
o Add bandwidthburst to server descriptor.
o Directories now say which dirserver signed them.
o Use a tor_assert macro that logs failed assertions too.
Changes in version 0.0.6pre5 - 2004-04-18
o changes from 0.0.6pre4:
- make tor build on broken freebsd 5.2 installs
- fix a failed assert when you try an intro point, get a nack, and try
a second one and it works.
- when alice uses a port that the hidden service doesn't accept,
it now sends back an end cell (denied by exit policy). otherwise
alice would just have to wait to time out.
- fix another rare bug: when we had tried all the intro
points for a hidden service, we fetched the descriptor
again, but we left our introcirc thinking it had already
sent an intro, so it kept waiting for a response...
- bugfix: when you sleep your hidden-service laptop, as soon
as it wakes up it tries to upload a service descriptor, but
socketpair fails for some reason (localhost not up yet?).
now we simply give up on that upload, and we'll try again later.
i'd still like to find the bug though.
- if an intro circ waiting for an ack dies before getting one, then
count it as a nack
- we were reusing stale service descriptors and refetching usable
ones. oops.
Changes in version 0.0.6pre4 - 2004-04-14
o changes from 0.0.6pre3:
- when bob fails to connect to the rendezvous point, and his
circ didn't fail because of the rendezvous point itself, then
he retries a couple of times
- we expire introduction and rendezvous circs more thoroughly
(sometimes they were hanging around forever)
- we expire unattached rendezvous streams that have been around
too long (they were sticking around forever).
- fix a measly fencepost error that was crashing everybody with
a strict glibc.
Changes in version 0.0.6pre3 - 2004-04-14
o changes from 0.0.6pre2:
- make hup work again
- fix some memory leaks for dirservers
- allow more skew in rendezvous descriptor timestamps, to help
handle people like blanu who don't know what time it is
- normal circs are 3 hops, but some rend/intro circs are 4, if
the initiator doesn't get to choose the last hop
- send acks for introductions, so alice can know whether to try
again
- bob publishes intro points more correctly
o changes from 0.0.5:
- fix an assert trigger that's been plaguing us since the days
of 0.0.2prexx (thanks weasel!)
- retry stream correctly when we fail to connect because of
exit-policy-reject (should try another) or can't-resolve-address
(also should try another, because dns on random internet servers
is flaky).
- when we hup a dirserver and we've *removed* a server from the
approved-routers list, now we remove that server from the
in-memory directories too
Changes in version 0.0.6pre2 - 2004-04-08
o We fixed our base32 implementation. Now it works on all architectures.
Changes in version 0.0.6pre1 - 2004-04-08
o Features:
- Hidden services and rendezvous points are implemented. Go to
http://6sxoyfb3h2nvok2d.onion/ for an index of currently available
hidden services. (This only works via a socks4a proxy such as
Privoxy, and currently it's quite slow.)
Changes in version 0.0.5 - 2004-03-30
[version bump only]
Changes in version 0.0.5rc3 - 2004-03-29
o Install torrc as torrc.sample -- we no longer clobber your
torrc. (Woo!)
o Re-enable recommendedversion checking (we broke it in rc2, oops)
o Add in a 'notice' log level for things the operator should hear
but that aren't warnings
Changes in version 0.0.5rc2 - 2004-03-29
o Hold socks connection open until reply is flushed (if possible)
o Make exit nodes resolve IPs to IPs immediately, rather than asking
the dns farm to do it.
o Fix c99 aliasing warnings in rephist.c
o Don't include server descriptors that are older than 24 hours in the
directory.
o Give socks 'reject' replies their whole 15s to attempt to flush,
rather than seeing the 60s timeout and assuming the flush had failed.
o Clean automake droppings from the cvs repository
Changes in version 0.0.5rc1 - 2004-03-28
o Fix mangled-state bug in directory fetching (was causing sigpipes).
o Only build circuits after we've fetched the directory: clients were
using only the directory servers before they'd fetched a directory.
This also means longer startup time; so it goes.
o Fix an assert trigger where an OP would fail to handshake, and we'd
expect it to have a nickname.
o Work around a tsocks bug: do a socks reject when AP connection dies
early, else tsocks goes into an infinite loop.
Changes in version 0.0.4 - 2004-03-26
o When connecting to a dirserver or OR and the network is down,
we would crash.
Changes in version 0.0.3 - 2004-03-26
o Warn and fail if server chose a nickname with illegal characters
o Port to Solaris and Sparc:
- include missing header fcntl.h
- have autoconf find -lsocket -lnsl automatically
- deal with hardware word alignment
- make uname() work (solaris has a different return convention)
- switch from using signal() to sigaction()
o Preliminary work on reputation system:
- Keep statistics on success/fail of connect attempts; they're published
by kill -USR1 currently.
- Add a RunTesting option to try to learn link state by creating test
circuits, even when SocksPort is off.
- Remove unused open circuits when there are too many.
Changes in version 0.0.2 - 2004-03-19
- Include strlcpy and strlcat for safer string ops
- define INADDR_NONE so we compile (but still not run) on solaris
Changes in version 0.0.2pre27 - 2004-03-14
o Bugfixes:
- Allow internal tor networks (we were rejecting internal IPs,
now we allow them if they're set explicitly).
- And fix a few endian issues.
Changes in version 0.0.2pre26 - 2004-03-14
o New features:
- If a stream times out after 15s without a connected cell, don't
try that circuit again: try a new one.
- Retry streams at most 4 times. Then give up.
- When a dirserver gets a descriptor from an unknown router, it
logs its fingerprint (so the dirserver operator can choose to
accept it even without mail from the server operator).
- Inform unapproved servers when we reject their descriptors.
- Make tor build on Windows again. It works as a client, who knows
about as a server.
- Clearer instructions in the torrc for how to set up a server.
- Be more efficient about reading fd's when our global token bucket
(used for rate limiting) becomes empty.
o Bugfixes:
- Stop asserting that computers always go forward in time. It's
simply not true.
- When we sent a cell (e.g. destroy) and then marked an OR connection
expired, we might close it before finishing a flush if the other
side isn't reading right then.
- Don't allow dirservers to start if they haven't defined
RecommendedVersions
- We were caching transient dns failures. Oops.
- Prevent servers from publishing an internal IP as their address.
- Address a strcat vulnerability in circuit.c
Changes in version 0.0.2pre25 - 2004-03-04
o New features:
- Put the OR's IP in its router descriptor, not its fqdn. That way
we'll stop being stalled by gethostbyname for nodes with flaky dns,
e.g. poblano.
o Bugfixes:
- If the user typed in an address that didn't resolve, the server
crashed.
Changes in version 0.0.2pre24 - 2004-03-03
o Bugfixes:
- Fix an assertion failure in dns.c, where we were trying to dequeue
a pending dns resolve even if it wasn't pending
- Fix a spurious socks5 warning about still trying to write after the
connection is finished.
- Hold certain marked_for_close connections open until they're finished
flushing, rather than losing bytes by closing them too early.
- Correctly report the reason for ending a stream
- Remove some duplicate calls to connection_mark_for_close
- Put switch_id and start_daemon earlier in the boot sequence, so it
will actually try to chdir() to options.DataDirectory
- Make 'make test' exit(1) if a test fails; fix some unit tests
- Make tor fail when you use a config option it doesn't know about,
rather than warn and continue.
- Make --version work
- Bugfixes on the rpm spec file and tor.sh, so it's more up to date
Changes in version 0.0.2pre23 - 2004-02-29
o New features:
- Print a statement when the first circ is finished, so the user
knows it's working.
- If a relay cell is unrecognized at the end of the circuit,
send back a destroy. (So attacks to mutate cells are more
clearly thwarted.)
- New config option 'excludenodes' to avoid certain nodes for circuits.
- When it daemonizes, it chdir's to the DataDirectory rather than "/",
so you can collect coredumps there.
o Bugfixes:
- Fix a bug in tls flushing where sometimes data got wedged and
didn't flush until more data got sent. Hopefully this bug was
a big factor in the random delays we were seeing.
- Make 'connected' cells include the resolved IP, so the client
dns cache actually gets populated.
- Disallow changing from ORPort=0 to ORPort>0 on hup.
- When we time-out on a stream and detach from the circuit, send an
end cell down it first.
- Only warn about an unknown router (in exitnodes, entrynodes,
excludenodes) after we've fetched a directory.
Changes in version 0.0.2pre22 - 2004-02-26
o New features:
- Servers publish less revealing uname information in descriptors.
- More memory tracking and assertions, to crash more usefully when
errors happen.
- If the default torrc isn't there, just use some default defaults.
Plus provide an internal dirservers file if they don't have one.
- When the user tries to use Tor as an http proxy, give them an http
501 failure explaining that we're a socks proxy.
- Dump a new router.desc on hup, to help confused people who change
their exit policies and then wonder why router.desc doesn't reflect
it.
- Clean up the generic tor.sh init script that we ship with.
o Bugfixes:
- If the exit stream is pending on the resolve, and a destroy arrives,
then the stream wasn't getting removed from the pending list. I
think this was the one causing recent server crashes.
- Use a more robust poll on OSX 10.3, since their poll is flaky.
- When it couldn't resolve any dirservers, it was useless from then on.
Now it reloads the RouterFile (or default dirservers) if it has no
dirservers.
- Move the 'tor' binary back to /usr/local/bin/ -- it turns out
many users don't even *have* a /usr/local/sbin/.
Changes in version 0.0.2pre21 - 2004-02-18
o New features:
- There's a ChangeLog file that actually reflects the changelog.
- There's a 'torify' wrapper script, with an accompanying
tor-tsocks.conf, that simplifies the process of using tsocks for
tor. It even has a man page.
- The tor binary gets installed to sbin rather than bin now.
- Retry streams where the connected cell hasn't arrived in 15 seconds
- Clean up exit policy handling -- get the default out of the torrc,
so we can update it without forcing each server operator to fix
his/her torrc.
- Allow imaps and pop3s in default exit policy
o Bugfixes:
- Prevent picking middleman nodes as the last node in the circuit
Changes in version 0.0.2pre20 - 2004-01-30
o New features:
- We now have a deb package, and it's in debian unstable. Go to
it, apt-getters. :)
- I've split the TotalBandwidth option into BandwidthRate (how many
bytes per second you want to allow, long-term) and
BandwidthBurst (how many bytes you will allow at once before the cap
kicks in). This better token bucket approach lets you, say, set
BandwidthRate to 10KB/s and BandwidthBurst to 10MB, allowing good
performance while not exceeding your monthly bandwidth quota.
- Push out a tls record's worth of data once you've got it, rather
than waiting until you've read everything waiting to be read. This
may improve performance by pipelining better. We'll see.
- Add an AP_CONN_STATE_CONNECTING state, to allow streams to detach
from failed circuits (if they haven't been connected yet) and attach
to new ones.
- Expire old streams that haven't managed to connect. Some day we'll
have them reattach to new circuits instead.
o Bugfixes:
- Fix several memory leaks that were causing servers to become bloated
after a while.
- Fix a few very rare assert triggers. A few more remain.
- Setuid to User _before_ complaining about running as root.
Changes in version 0.0.2pre19 - 2004-01-07
o Bugfixes:
- Fix deadlock condition in dns farm. We were telling a child to die by
closing the parent's file descriptor to him. But newer children were
inheriting the open file descriptor from the parent, and since they
weren't closing it, the socket never closed, so the child never read
eof, so he never knew to exit. Similarly, dns workers were holding
open other sockets, leading to all sorts of chaos.
- New cleaner daemon() code for forking and backgrounding.
- If you log to a file, it now prints an entry at the top of the
logfile so you know it's working.
- The onionskin challenge length was 30 bytes longer than necessary.
- Started to patch up the spec so it's not quite so out of date.
Changes in version 0.0.2pre18 - 2004-01-02
o Bugfixes:
- Fix endian issues with the 'integrity' field in the relay header.
- Fix a potential bug where connections in state
AP_CONN_STATE_CIRCUIT_WAIT might unexpectedly ask to write.
Changes in version 0.0.2pre17 - 2003-12-30
o Bugfixes:
- Made --debuglogfile (or any second log file, actually) work.
- Resolved an edge case in get_unique_circ_id_by_conn where a smart
adversary could force us into an infinite loop.
o Features:
- Each onionskin handshake now includes a hash of the computed key,
to prove the server's identity and help perfect forward secrecy.
- Changed cell size from 256 to 512 bytes (working toward compatibility
with MorphMix).
- Changed cell length to 2 bytes, and moved it to the relay header.
- Implemented end-to-end integrity checking for the payloads of
relay cells.
- Separated streamid from 'recognized' (otherwise circuits will get
messed up when we try to have streams exit from the middle). We
use the integrity-checking to confirm that a cell is addressed to
this hop.
- Randomize the initial circid and streamid values, so an adversary who
breaks into a node can't learn how many circuits or streams have
been made so far.
Changes in version 0.0.2pre16 - 2003-12-14
o Bugfixes:
- Fixed a bug that made HUP trigger an assert
- Fixed a bug where a circuit that immediately failed wasn't being
counted as a failed circuit in counting retries.
o Features:
- Now we close the circuit when we get a truncated cell: otherwise we're
open to an anonymity attack where a bad node in the path truncates
the circuit and then we open streams at him.
- Add port ranges to exit policies
- Add a conservative default exit policy
- Warn if you're running tor as root
- on HUP, retry OR connections and close/rebind listeners
- options.EntryNodes: try these nodes first when picking the first node
- options.ExitNodes: if your best choices happen to include any of
your preferred exit nodes, you choose among just those preferred
exit nodes.
- options.ExcludedNodes: nodes that are never picked in path building
Changes in version 0.0.2pre15 - 2003-12-03
o Robustness and bugfixes:
- Sometimes clients would cache incorrect DNS resolves, which would
really screw things up.
- An OP that goes offline would slowly leak all its sockets and stop
working.
- A wide variety of bugfixes in exit node selection, exit policy
handling, and processing pending streams when a new circuit is
established.
- Pick nodes for a path only from those the directory says are up
- Choose randomly from all running dirservers, not always the first one
- Increase allowed http header size for directory fetch.
- Stop writing to stderr (if we're daemonized it will be closed).
- Enable -g always, so cores will be more useful to me.
- Switch "-lcrypto -lssl" to "-lssl -lcrypto" for broken distributions.
o Documentation:
- Wrote a man page. It lists commonly used options.
o Configuration:
- Change default loglevel to warn.
- Make PidFile default to null rather than littering in your CWD.
- OnionRouter config option is now obsolete. Instead it just checks
ORPort>0.
- Moved to a single unified torrc file for both clients and servers.
Changes in version 0.0.2pre14 - 2003-11-29
o Robustness and bugfixes:
- Force the admin to make the DataDirectory himself
- to get ownership/permissions right
- so clients no longer make a DataDirectory and then never use it
- fix bug where a client who was offline for 45 minutes would never
pull down a directory again
- fix (or at least hide really well) the dns assert bug that was
causing server crashes
- warnings and improved robustness wrt clockskew for certs
- use the native daemon(3) to daemonize, when available
- exit if bind() fails
- exit if neither socksport nor orport is defined
- include our own tor_timegm (Win32 doesn't have its own)
- bugfix for win32 with lots of connections
- fix minor bias in PRNG
- make dirserver more robust to corrupt cached directory
o Documentation:
- Wrote the design document (woo)
o Circuit building and exit policies:
- Circuits no longer try to use nodes that the directory has told them
are down.
- Exit policies now support bitmasks (18.0.0.0/255.0.0.0) and
bitcounts (18.0.0.0/8).
- Make AP connections standby for a circuit if no suitable circuit
exists, rather than failing
- Circuits choose exit node based on addr/port, exit policies, and
which AP connections are standing by
- Bump min pathlen from 2 to 3
- Relay end cells have a payload to describe why the stream ended.
- If the stream failed because of exit policy, try again with a new
circuit.
- Clients have a dns cache to remember resolved addresses.
- Notice more quickly when we have no working circuits
o Configuration:
- APPort is now called SocksPort
- SocksBindAddress, ORBindAddress, DirBindAddress let you configure
where to bind
- RecommendedVersions is now a config variable rather than
hardcoded (for dirservers)
- Reloads config on HUP
- Usage info on -h or --help
- If you set User and Group config vars, it'll setu/gid to them.
Changes in version 0.0.2pre13 - 2003-10-19
o General stability:
- SSL_write no longer fails when it returns WANTWRITE and the number
of bytes in the buf has changed by the next SSL_write call.
- Fix segfault fetching directory when network is down
- Fix a variety of minor memory leaks
- Dirservers reload the fingerprints file on HUP, so I don't have
to take down the network when I approve a new router
- Default server config file has explicit Address line to specify fqdn
o Buffers:
- Buffers grow and shrink as needed (Cut process size from 20M to 2M)
- Make listener connections not ever alloc bufs
o Autoconf improvements:
- don't clobber an external CFLAGS in ./configure
- Make install now works
- create var/lib/tor on make install
- autocreate a tor.sh initscript to help distribs
- autocreate the torrc and sample-server-torrc with correct paths
o Log files and Daemonizing now work:
- If --DebugLogFile is specified, log to it at -l debug
- If --LogFile is specified, use it instead of commandline
- If --RunAsDaemon is set, tor forks and backgrounds on startup
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