[tor-bugs] #28275 [Core Tor/Tor]: hs-v3: Rotate intro points and close RP circuits when removing client auth service side

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#28275: hs-v3: Rotate intro points and close RP circuits when removing client auth
service side
------------------------------+--------------------------------
     Reporter:  dgoulet       |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Very High     |  Milestone:  Tor: 0.3.5.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: 0.3.5.1-alpha
     Severity:  Normal        |   Keywords:  security, tor-hs
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+--------------------------------
 On the service side (only), when a client authorization is removed and
 then tor is HUP, right now the service notices that and re-upload a new
 descriptor containing that new auth.

 However, the into points are most likely kept as is (if no normal rotation
 happened during re-build) which means that a revoked client can still
 access the service with their cached descriptor because the intro points
 are still valid...

 Furthermore, the RP circuits for that client aren't closed.

 Security wise, that is not ideal to have a "not really revoked client" ;).
 Fortunately, only applies to 0.3.5.1-alpha and onward so no need for a
 TROVE.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28275>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

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