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dev_ping: don't crash with silly values.

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It's a dev command, but still.

Fixes: #985
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2018-02-20 16:37:18 +10:30
parent 91a9c2923f
commit b536e97df2
2 changed files with 31 additions and 0 deletions
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26
lightningd/dev_ping.c
View File

@ -62,6 +62,26 @@ static void json_dev_ping(struct command *cmd,
return;
}
/* BOLT #1:
*
* 1. `type`: a 2-byte big-endian field indicating the type of message
* 2. `payload`
*...
* The size of the message is required by the transport layer to fit
* into a 2-byte unsigned int; therefore, the maximum possible size is
* 65535 bytes.
*...
* 1. type: 18 (`ping`)
* 2. data:
* * [`2`:`num_pong_bytes`]
* * [`2`:`byteslen`]
* * [`byteslen`:`ignored`]
*/
if (len > 65535 - 2 - 2 - 2) {
command_fail(cmd, "%u would result in oversize ping", len);
return;
}
if (!json_tok_number(buffer, pongbytestok, &pongbytes)) {
command_fail(cmd, "'%.*s' is not a valid number",
pongbytestok->end - pongbytestok->start,
@ -69,6 +89,12 @@ static void json_dev_ping(struct command *cmd,
return;
}
/* Note that > 65531 is valid: it means "no pong reply" */
if (pongbytes > 65535) {
command_fail(cmd, "pongbytes %u > 65535", pongbytes);
return;
}
if (!json_tok_pubkey(buffer, idtok, &id)) {
command_fail(cmd, "'%.*s' is not a valid pubkey",
idtok->end - idtok->start,

5
tests/test_lightningd.py
View File

@ -1851,6 +1851,11 @@ class LightningDTests(BaseLightningDTests):
ret = l1.rpc.dev_ping(l2.info['id'], 1000, s)
assert ret['totlen'] == 0
# 65535 - type(2 bytes) - num_pong_bytes(2 bytes) - byteslen(2 bytes)
# = 65529 max.
self.assertRaisesRegex(ValueError, r'oversize ping',
l1.rpc.dev_ping, l2.info['id'], 65530, 1)
@unittest.skipIf(not DEVELOPER, "needs DEVELOPER=1")
def test_ping(self):
l1,l2 = self.connect()