[tor-bugs] #15515 [Tor]: Don't allow multiple INTRODUCE1s on the same circuit

[Tor Bug Tracker & Wiki]

#15515: Don't allow multiple INTRODUCE1s on the same circuit
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     Reporter:  asn      |      Owner:
         Type:  defect   |     Status:  needs_review
     Priority:  normal   |  Milestone:  Tor: 0.2.6.x-final
    Component:  Tor      |    Version:
   Resolution:           |   Keywords:  026-backport 025-backport
Actual Points:           |  024-backport
       Points:           |  Parent ID:  #15463
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Comment (by cypherpunks):

 > Upgrading can't to prevent legit client from sending second introduce1
 cell on behalf of broken or evil HS.
 I'll remove this sentence, it's wrong.
 But let this to send as many NACKs as it can, anyway.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15515#comment:22>
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