[tor-bugs] #14265 [Torsocks]: Torsocks works badly with default VirtualAddrNetworkIPv4 ranges

Tor Bug Tracker & Wiki blackhole at torproject.org
Sun Jan 18 19:06:21 UTC 2015


#14265: Torsocks works badly with default VirtualAddrNetworkIPv4 ranges
----------------------+-------------------------
 Reporter:  nickm     |          Owner:  dgoulet
     Type:  defect    |         Status:  new
 Priority:  normal    |      Milestone:
Component:  Torsocks  |        Version:
 Keywords:            |  Actual Points:
Parent ID:            |         Points:
----------------------+-------------------------
 In comment:9:ticket:7555 , aagbsn notes that you get the following warning
 when you use a default AutoMap configuration with IPv4:
 {{{
 05:53:37 libtorsocks(13692): connect: Connection is to a local address
 (127.192.0.1),
 may be a TCP DNS request to a local DNS server so have to reject to be
 safe.
 Please report a bug to  http://code.google.com/p/torsocks/issues/entry if
 this is
 preventing a program from working  properly with torsocks.
 }}}

 When AutomapHostsOnResolve is enabled, then Tor returns phony DNS
 addresses in the "Virtual range" (VirtualAddrNetworkIPv4,
 VirtualAddrNetworkIPv6) in response to requests for hosts listed in
 AutomapHostsSuffixes.  For example, foobar.onion might resolve into
 127.192.66.55, and subsequent connection attempts to 127.192.66.55 will
 cause Tor to make a connection to foobar.onion.

 By default, VirtualAddrNetworkIPv4 is 127.192.0.0/10 and
 VirtualAddrNetworkIPv6 is [FE80::]/10 .  It looks like torsocks rejects
 the IPv4 one because it's a local address?  There should probably be some
 way to make it not do that, or to make an exception for a certain range,
 or something.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14265>
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