[tor-bugs] #21621 [Core Tor/Tor]: Intro points can get stuck in CIRCUIT_PURPOSE_S_ESTABLISH_INTRO

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#21621: Intro points can get stuck in CIRCUIT_PURPOSE_S_ESTABLISH_INTRO
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 Reporter:  teor          |          Owner:  teor
     Type:  defect        |         Status:  new
 Priority:  Medium        |      Milestone:  Tor: 0.3.1.x-final
Component:  Core Tor/Tor  |        Version:  Tor: 0.2.7.2-alpha
 Severity:  Normal        |     Resolution:
 Keywords:  tor-hs        |  Actual Points:
Parent ID:  #21446        |         Points:  1
 Reviewer:                |        Sponsor:
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Changes (by teor):

 * status:  needs_information => new


Comment:

 Replying to [comment:2 dgoulet]:
 > I think we do.
 >
 > `intro->circuit_established = 1;` is what signals that the intro circuit
 is established and ready to be used?

 We only do that when the INTRO_ESTABLISHED cell is received.
 Until then, `intro->circuit_established` is 0, and it can remain in that
 state forever:
 * What if the introduction point has a bug and never sends it?
   * What do introduction points do when they detect a replay?
 * What if there's a deliberate attack where an intro point maintains the
 circuit but never sends the INTRO_ESTABLISHED cell?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21621#comment:3>
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