[tor-bugs] #21014 [Core Tor/Tor]: TR is blocking Tor connections

[Tor Bug Tracker & Wiki]

#21014: TR is blocking Tor connections
------------------------------+-----------------
     Reporter:  mrphs         |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+-----------------
 After getting some reports on twitter about Tor being blocked in Turkey
 and some chat on IRC, <bypassemall> aka <trdpi> aka <kzdpi> ran some tests
 and found some interesting information about how Turkey is blocking
 vanilla Tor connections. I paste their findings here:

 {{{

 16:48 < trdpi> 10 connections died in state handshaking (TLS) with SSL
 state SSLv2/v3 read server hello A in HANDSHAKE
 16:48 < trdpi> after less than 10 seconds
 ...
 16:55 < trdpi> this isp injects rst it seems
 16:56 < trdpi> to both side, as i got 2 rst one legit and 2 not
 16:57 < mrphs> oh apparently today is an special day in turkey
 ...
 17:00 < trdpi> telneting to or port, no rsts. it triggered by something
 more than ip:port connection
 17:01 < trdpi> yay, window trick for split req works for tr
 17:02 < trdpi> magic tool allows to bypass vanilla tor censorship
 17:04 < trdpi> so it's about ciphersuits or something
 17:07 < trdpi> it's like kz, but obfs4 works
 17:07 < trdpi> and kz do not rsts
 17:07 < trdpi> it controlls connection
 17:07 < trdpi> and tr like do not controlls and to inject fraud only

 }}}

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21014>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online