[tor-bugs] #27841 [Core Tor/Tor]: Surprise race: Intro point closes circuit after NACK, at the same time as client tries to extend circuit to new intro point

[Tor Bug Tracker & Wiki]

#27841: Surprise race: Intro point closes circuit after NACK, at the same time as
client tries to extend circuit to new intro point
-------------------------------------------------+-------------------------
 Reporter:  asn                                  |          Owner:  neel
     Type:  defect                               |         Status:  closed
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.5.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:  fixed
 Keywords:  tor-hs dos 035-backport              |  Actual Points:
  040-backport 041-backport                      |
Parent ID:                                       |         Points:
 Reviewer:  dgoulet                              |        Sponsor:
                                                 |  Sponsor27
-------------------------------------------------+-------------------------

Comment (by dgoulet):

 Replying to [comment:31 nickm]:
 > Is there a flag we can stop giving them?

 We would need to remove HSIntro=4 basically from the 032, 033 and 034
 relays so the service will go in legacy mode and this bug is not in the
 legacy code.

 Not sure the authorities can do that :S

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27841#comment:32>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online