[tbb-bugs] #25036 [Core Tor/Tor]: Tor 0.3.2 rejects connections to raw ipv6 addresses

Tor Bug Tracker & Wiki blackhole at torproject.org
Mon Feb 5 20:16:13 UTC 2018

#25036: Tor 0.3.2 rejects connections to raw ipv6 addresses
 Reporter:  pastly                        |          Owner:  tbb-team
     Type:  defect                        |         Status:
                                          |  needs_information
 Priority:  High                          |      Milestone:  Tor:
                                          |  0.3.3.x-final
Component:  Core Tor/Tor                  |        Version:  Tor:
 Severity:  Normal                        |     Resolution:
 Keywords:  regression ipv6 032-backport  |  Actual Points:
Parent ID:                                |         Points:
 Reviewer:                                |        Sponsor:
Changes (by dgoulet):

 * status:  new => needs_information


 Quick question on this. Are we sure this is not Tor Browser sending a
 SOCKS5 request with the type "fqdn" used with an IPv6 address?

 That `string_is_valid_hostname()` check is done when we get an `atyp =
 0x03` in the SOCKS5 request which means tor should expect a FQDN thus
 returning the error here is fine. The IPv6 address is handled before.

 Why is TB sending a fqdn request at all with this address:
 https://[2a00:1450:401b:800::200e]/ ?

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25036#comment:12>
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