[tor-bugs] #7167 [Pluggable transport]: Combine traffic obfuscation with address diversity of flash proxy

[Tor Bug Tracker & Wiki]

#7167: Combine traffic obfuscation with address diversity of flash proxy
---------------------------------+-----------------------------------------
     Reporter:  karsten          |      Owner:  asn
         Type:  project          |     Status:  needs_revision
     Priority:  normal           |  Milestone:
    Component:  Pluggable        |    Version:
  transport                      |   Keywords:  SponsorF20131101 flashproxy
   Resolution:                   |  Parent ID:
Actual Points:                   |
       Points:                   |
---------------------------------+-----------------------------------------

Comment (by infinity0):

 I've found a problem with the current set-up. I'm not sure why it's
 happening, but it's something special about our plugin composition.

 If I disconnect my browser proxy and reconnect it (by reloading the page),
 with flashproxy-client tor is able to recover and I can continue browsing.
 However, with obfs-flash-client, tor is unable to do this and I get a
 bunch of error messages like this:

 {{{
 Oct 11 19:32:59.000 [notice] We tried for 15 seconds to connect to
 '[scrubbed]' using exit X1 at A1. Retrying on a new circuit.
 [x4]
 Oct 11 19:33:14.000 [notice] We tried for 15 seconds to connect to
 '[scrubbed]' using exit X2 at A2. Retrying on a new circuit.
 [x4]
 Oct 11 19:33:29.000 [notice] We tried for 15 seconds to connect to
 '[scrubbed]' using exit X3 at A3. Retrying on a new circuit.
 [x4]
 }}}

 Would either of you know why this is happening? To reproduce:

 torrc line for flashproxy-client:

 {{{
 ClientTransportPlugin websocket exec ./flashproxy-client --register -f
 http://siteb.fp-facilitator.org/fac/ --register-methods http :0
 }}}

 torrc line for obfs-flash-client (requires latest master from my github):

 {{{
 ClientTransportPlugin obfs3_flash exec ./obfs-flash-client --fp-arg=-f
 --fp-arg=http://siteb.fp-facilitator.org/fac/ --fp-arg=--register-
 methods=http 2334
 }}}

 browser proxy:

 http://siteb.fp-facilitator.org/proxy/embed.html?debug&unsafe_logging=true

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7167#comment:42>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online