[tor-bugs] #29699 [Core Tor/Tor]: INTRO2 replay warn logs with v3 onions

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#29699: INTRO2 replay warn logs with v3 onions
------------------------------+--------------------
     Reporter:  mikeperry     |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+--------------------
 While testing vanguards 0.3.0 with tor 0.4.0.2-alpha and a v3 onion
 service that was only for my testing, I got several loglines to the effect
 of

 {{{
 Mar 07 11:10:17.000 [info] hs_circ_handle_introduce2(): We received an
 INTRODUCE2 cell with same REND_COOKIE field 1 seconds ago. Dropping cell.
 Mar 08 12:05:58.000 [warn] Possible replay detected! An INTRODUCE2 cell
 with thesame ENCRYPTED section was seen 0 seconds ago. Dropping cell.
 Mar 08 14:17:21.000 [warn] Possible replay detected! An INTRODUCE2 cell
 with thesame ENCRYPTED section was seen 59 seconds ago. Dropping cell.
 }}}

 The client was Tor version 0.3.5.7 (git-9beb085c10562a25), from Tor
 Browser 8.0.6. The client was accessing the service as follows:

 {{{
 while [ true ]; do
   torsocks wget  http://$MYV3_ONION_NAME.onion/404 -O /dev/null
   killall -HUP tor;
 done
 }}}

 That v3 404 url is in fact non-existant -- it does just send back a HTTP
 404.

 I'll match up some log instances and attach.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29699>
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