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45 lines
1.4 KiB
Text
45 lines
1.4 KiB
Text
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Tor's (little) Firewall Helper specification
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Jacob Appelbaum
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0. Preface
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This document describes issues faced by Tor users who are behind NAT devices
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and wish to share their resources with the rest of the Tor network. It also
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explains a possible solution for some NAT devices.
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1. Overview
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Tor users often wish to relay traffic for the Tor network and their upstream
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firewall thwarts their attempted generosity. Automatic port forwarding
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configuration for many consumer NAT devices is often available with two common
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protocols NAT-PMP[0] and UPnP[1].
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2. Implementation
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tor-fw-helper is a program that implements basic port forwarding requests; it
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may be used alone or called from Tor itself.
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2.1 Output format
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When tor-fw-helper has completed the requested action successfully, it will
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report the following message to standard output:
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tor-fw-helper: SUCCESS
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If tor-fw-helper was unable to complete the requested action successfully, it
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will report the following message to standard error:
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tor-fw-helper: FAILURE
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All informational messages are printed to standard output; all error messages
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are printed to standard error.
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3. Security Concerns
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It is probably best to hand configure port forwarding and in the process, we
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suggest disabling NAT-PMP and/or UPnP.
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[0] http://en.wikipedia.org/wiki/NAT_Port_Mapping_Protocol
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[1] http://en.wikipedia.org/wiki/Universal_Plug_and_Play
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