[tor-bugs] #18129 [Tor Messenger]: Investigate chosen ciphersuite

Tor Bug Tracker & Wiki blackhole at torproject.org
Sat Jan 23 02:17:36 UTC 2016


#18129: Investigate chosen ciphersuite
---------------------------+---------------------
 Reporter:  arlolra        |          Owner:
     Type:  defect         |         Status:  new
 Priority:  High           |      Milestone:
Component:  Tor Messenger  |        Version:
 Severity:  Normal         |     Resolution:
 Keywords:                 |  Actual Points:
Parent ID:                 |         Points:
  Sponsor:                 |
---------------------------+---------------------

Comment (by arlolra):

 It's been suggested that the server doesn't do server side ordering, so
 whatever the client presents first gets picked, meaning Instantbird is
 ordered to use AES128-SHA-128 first :(

 `openssl s_client -cipher 'AES128-GCM-SHA256:AES256-GCM-SHA384' -connect
 irc.oftc.net:6697`

 => AES128-GCM-SHA256

 `openssl s_client -cipher 'AES256-GCM-SHA384:AES128-GCM-SHA256' -connect
 irc.oftc.net:6697`

 => AES256-GCM-SHA384

 Next step is to record the client hello in wireshark to see what it's
 presenting, to be sure. And then figure out why ...

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18129#comment:6>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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