[tor-bugs] #13837 [Core Tor/Tor]: Mitigate guard discovery by pinning middle node

Tor Bug Tracker & Wiki blackhole at torproject.org
Mon Jul 31 15:54:42 UTC 2017


#13837: Mitigate guard discovery by pinning middle node
------------------------------------------------+--------------------------
 Reporter:  asn                                 |          Owner:
                                                |  mikeperry
     Type:  defect                              |         Status:  assigned
 Priority:  Medium                              |      Milestone:  Tor:
                                                |  unspecified
Component:  Core Tor/Tor                        |        Version:
 Severity:  Normal                              |     Resolution:
 Keywords:  tor-hs, tor-guard, guard-discovery  |  Actual Points:
Parent ID:  #9001                               |         Points:
 Reviewer:                                      |        Sponsor:
                                                |  SponsorV-can
------------------------------------------------+--------------------------

Comment (by asn):

 Replying to [comment:11 mikeperry]:
 > Just FYI - I updated asn's branch to current origin/master and renamed
 the option to HSLayer2Guards. It also now applies to all HS circuit
 purpose types (not just rends).
 >
 > New branch location is mikeperry/prop247_torrc-rebased.
 >
 > Adding HSLayer3Guards next. After that, we can play with stem +
 onionperf.

 Sounds good. Took a look at the code and looks reasonable. WRT to:

 {{{
  * XXX: Hrmm.. HSDIR fetches might be CIRCUIT_PURPOSE_C_GENRAL.. How do
  * we differentiate those?
 }}}
 perhaps you can check for the `rend_data` field on the `origin_circuit_t`
 if you have access to that.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13837#comment:12>
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