[tor-bugs] #15743 [Tor]: Relax the "Blocking multiple introductions on the same circuit." log message

[Tor Bug Tracker & Wiki]

#15743: Relax the "Blocking multiple introductions on the same circuit." log
message
---------------------+------------------------------------
 Reporter:  asn      |          Owner:
     Type:  defect   |         Status:  new
 Priority:  trivial  |      Milestone:  Tor: 0.2.7.x-final
Component:  Tor      |        Version:
 Keywords:           |  Actual Points:
Parent ID:           |         Points:
---------------------+------------------------------------
 In #15515 we blocked HS DoS attacks by having IPs block multiple
 `INTRODUCE1` cells on the same circuit. When the IP blocks an attack, it
 issues this log message:
 {{{
     log_fn(LOG_PROTOCOL_WARN, LD_REND,
            "Blocking multiple introductions on the same circuit. "
            "Someone might be trying to attack a hidden service through "
            "this relay.");
 }}}

 You might notice it's in warn because we actually didn't think anyone was
 using this attack.

 Unfortunately, it seems like someone was actually using it, so a few
 people have encountered this message on their relays and it left them
 puzzled. I think the word "attack" makes this more mysterious than it
 deserves. Also, since there is no action for the user to do, maybe this
 log message can be silenced completely (toned down to info or something).

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15743>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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