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Re: [tor-bugs] #25882 [Core Tor/Tor]: clients not detecting stale onion service introduction points

#25882: clients not detecting stale onion service introduction points
-------------------------------------------------+-------------------------
 Reporter:  cypherpunks                          |          Owner:  dgoulet
     Type:  defect                               |         Status:
                                                 |  assigned
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-hs, 034-deferred-20180602        |  Actual Points:
  035-removed                                    |
Parent ID:  #22455                               |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by cypherpunks2):

 The file
 [https://trac.torproject.org/projects/tor/attachment/ticket/25882/debug.onionservice.2.log.xz
 debug.onionservice.2.log.xz] contains a pair of new failures, one for the
 v2 service and one for the v3 service, observed at about 21:00 local time.

 Notice the absence of the receipt of an {{{INTRODUCE2}}} cell in both
 cases.

 It seems that our bug affects both v2 and v3 services, and the symptom is
 that the onion service does not receive an {{{INTRODUCE2}}} cell, i.e. it
 does not hear from the introduction point.

 So, two thoughts: what is the mechanism by which the set of introduction
 points known to a client is kept synchronised with the set of "live"
 introduction points maintained by an onion service?  Note that a
 descriptor held by a client may become outdated, a descriptor held by the
 database may become outdated, and circuits maintained by the onion service
 may stop working...

 Also, what is to stop a malicious introduction point from sending an ACK
 to a client but never reaching out to the onion service?

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25882#comment:27>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

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