Re: [tor-bugs] #30649 [Core Tor/Tor]: Every few hours, relays [warn] Received circuit padding stop command for unknown machine.

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#30649: Every few hours, relays [warn] Received circuit padding stop command for
unknown machine.
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:
                                                 |  mikeperry
     Type:  defect                               |         Status:
                                                 |  needs_revision
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.1.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.4.1.1-alpha
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-relay, circuitpadding, wtf-pad,  |  Actual Points:
  041-must                                       |
Parent ID:                                       |         Points:  1
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor2
-------------------------------------------------+-------------------------

Comment (by teor):

 Replying to [comment:8 mikeperry]:
 > Hrmm.. but there is something that origins can do.. They can use
 ExcludeNodes to blacklist nodes that violoate protocol. Based on the
 reasoning for having LOG_PROTOCOL_WARN, it sounds like origin-facing
 procotol warns that mention the idhex and recommend ExcludeNodes should be
 fine as regular warns.

 I think you should talk to the Tor Browser team and UX team about this
 kind of warning. It could confuse a lot of Tor Browser users.

 > The reasoning is that I think that some users would prefer having
 padding defenses work over using broken nodes that violate protocol. Right
 now, circpad does not kill the circuit if padding fails in a bizarre way.
 I am thinking it should, or at least should tell the user and advise them.

 We need to design tor for the majority of our users, who do not edit their
 torrcs. But we also need to have advanced options available for users who
 need strict privacy. I don't know if there's a way to do both: we should
 talk to the UX team.

 > This ticket got a lot more complicated than fixing this bug.. Should we
 make a different ticket about the warns?

 Yes, I think so.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30649#comment:9>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

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