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



#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 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.

 The reasoning is that I think that some users would prefer padding
 defenses to using broken nodes. 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.

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

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30649#comment:8>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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