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Re: [tor-bugs] #33157 [Circumvention/Snowflake]: Client generates SDP with "IN IP4 0.0.0.0", causing proxy to send "client_ip=0.0.0.0" and bridge to send "USERADDR 0.0.0.0:1"
#33157: Client generates SDP with "IN IP4 0.0.0.0", causing proxy to send
"client_ip=0.0.0.0" and bridge to send "USERADDR 0.0.0.0:1"
-------------------------------------+------------------------
Reporter: dcf | Owner: (none)
Type: defect | Status: new
Priority: Medium | Milestone:
Component: Circumvention/Snowflake | Version:
Severity: Normal | Resolution:
Keywords: | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor:
-------------------------------------+------------------------
Comment (by dcf):
I'll say that the bug here is not necessarily that the SDP contains
0.0.0.0; it's that the proxy uses 0.0.0.0 as the client address despite
more meaningful information being available in the SDP. `remoteIPFromSDP`
could choose one of the candidates from an `a=candidate` line rather than
only looking at the `c=` line, for example. (Which one? It probably
doesn't matter, as they are all likely to have the same geolocation, as
long as you pick an external address candidate and not a LAN address
candidate.) One way to fix the problem would be to ensure that clients
generate SDP with a meaningful address in the `c=` line; another way would
be to use a different method of extracting the address in the proxy.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33157#comment:3>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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