[tor-bugs] #7144 [Core Tor/Tor]: Implement Bridge Guards and other anti-enumeration defenses

Tor Bug Tracker & Wiki blackhole at torproject.org
Mon May 23 19:03:09 UTC 2016

#7144: Implement Bridge Guards and other anti-enumeration defenses
 Reporter:  karsten                              |          Owner:  isis
     Type:  project                              |         Status:
 Priority:  High                                 |  needs_revision
Component:  Core Tor/Tor                         |      Milestone:  Tor:
 Severity:  Normal                               |  0.2.9.x-final
 Keywords:  SponsorZ, tor-bridge,                |        Version:
  027-triaged-1-out, 028-triage, 028-triaged,    |     Resolution:
  isis201604, isis201605, TorCoreTeam201605,     |  Actual Points:
  TorCoreTeam-postponed-201604                   |         Points:  3
Parent ID:                                       |        Sponsor:
 Reviewer:                                       |  SponsorS-can

Comment (by teor):

 Let's call the last 3 issues T1, T2, and T3.

 T4: Generalize logic for calculating cpath length.
 The code used to check `if (circ && circ->cpath)` and return 0 if `circ`
 is NULL.
 Now `circuit_get_cpath_len` will dereference `circ` without that check.
 (This might not be an issue if every caller makes sure `circ` is not

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7144#comment:39>
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