[tor-bugs] #20871 [Core Tor/Torsocks]: Regression in Torsocks 2.2.0 breaks wget, among others
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Sat Dec 3 10:39:41 UTC 2016
#20871: Regression in Torsocks 2.2.0 breaks wget, among others
-----------------------------------+---------------------
Reporter: cypherpunks | Owner: dgoulet
Type: defect | Status: new
Priority: High | Milestone:
Component: Core Tor/Torsocks | Version:
Severity: Major | Keywords:
Actual Points: | Parent ID:
Points: | Reviewer:
Sponsor: |
-----------------------------------+---------------------
Various applications no longer work due to a regression in the latest
Torsocks update, such as tlsdate and wget, whereas curl and youtube-dl
work. I've tested this by compiling both 2.1.0 and 2.2.0 and exporting the
library with LD_PRELOAD, and trying wget with both.
The problem is not with name resolution, as would be suggested in the wget
error, or with the TLS handshake, as tlsdate suggests, because the strace
output does not even get to socket() and connect(). However, when an IP
address is passed directly to wget rather than a hostname, 2.2.0 works. It
appears to me like the problem, at least in wget's case, is with the
hostname resolution code being hooked incorrectly by Torsocks. That's just
a guess though.
With wget and curl:
{{{
$ LD_PRELOAD=libtorsocks-2.1.0.so curl https://www.torproject.org/
>/dev/null
% Total % Received % Xferd Average Speed Time Time Time
Current
Dload Upload Total Spent Left
Speed
100 15868 100 15868 0 0 6158 0 0:00:02 0:00:02 --:--:--
8369
$ LD_PRELOAD=libtorsocks-2.1.0.so wget --spider
https://www.torproject.org/
Spider mode enabled. Check if remote file exists.
--2016-12-03 10:08:57-- https://www.torproject.org/
Resolving www.torproject.org... 38.229.72.16
Connecting to www.torproject.org|38.229.72.16|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 15868 (15K) [text/html]
Remote file exists and could contain further links,
but recursion is disabled -- not retrieving.
$ LD_PRELOAD=libtorsocks-2.2.0.so curl https://www.torproject.org/
>/dev/null
% Total % Received % Xferd Average Speed Time Time Time
Current
Dload Upload Total Spent Left
Speed
100 15868 100 15868 0 0 7227 0 0:00:02 0:00:02 --:--:--
10494
$ LD_PRELOAD=libtorsocks-2.2.0.so wget --spider
https://www.torproject.org/
Spider mode enabled. Check if remote file exists.
--2016-12-03 10:09:20-- https://www.torproject.org/
Resolving www.torproject.org... failed: Unknown error.
wget: unable to resolve host address www.torproject.org
$ LD_PRELOAD=libtorsocks-2.2.0.so wget --spider $(tor-resolve
torproject.org)
Spider mode enabled. Check if remote file exists.
--2016-12-03 10:11:12-- http://138.201.14.197/
Connecting to 138.201.14.197:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 496 [text/html]
Remote file exists and could contain further links,
but recursion is disabled -- not retrieving.
}}}
And with tlsdate:
{{{
$ LD_PRELOAD=libtorsocks-2.1.0.so tlsdate -n -V
Sat Dec 3 10:11:57 UTC 2016
$ LD_PRELOAD=libtorsocks-2.2.0.so tlsdate -n -V
SSL connection failed
child process failed in SSL handshake
}}}
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20871>
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