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[tor-bugs] #32439 [Circumvention/Obfs4]: tor can't bootstrap with obfs4 bridge and skewed clock
#32439: tor can't bootstrap with obfs4 bridge and skewed clock
-------------------------+-------------------------------------------------
Reporter: | Owner: (none)
intrigeri |
Type: defect | Status: new
Priority: Medium | Milestone:
Component: | Version:
Circumvention/Obfs4 |
Severity: Normal | Keywords: bootstrap, clock-skew, AffectsTails
Actual Points: | Parent ID:
Points: | Reviewer:
Sponsor: |
-------------------------+-------------------------------------------------
Environment: Debian unstable, Tor Browser 9.0.1, system clock set 2h in
the future.
Observed behavior: Tor Launcher says "Connected to bridge" but the
progress bar is stuck at a very low percentage. After a while, the "Copy
Tor Log To Clipboard" button appears.
Impact: Tails users whose hardware clock is set to local time, in a
timezone that's not close enough to UTC, cannot use obfs4 bridges.
Unfortunately, that's quite common, because:
* Windows sets the hardware clock to local time by default (as opposed to
Unix systems, that tend to assume the hardware clock is in UTC)
* many places where one needs obfs4 to use Tor are 4-7 hours ahead of UTC
* Tails can't guess whether the hardware clock is set to UTC time or to
local time; it assumes it's UTC time
Corresponding tor log (actual obfs4 bridges IP & port redacted):
{{{
11/9/19, 16:39:11.903 [NOTICE] DisableNetwork is set. Tor will not make or
accept non-control network connections. Shutting down all existing
connections.
11/9/19, 16:39:11.903 [NOTICE] Switching to guard context "bridges" (was
using "default")
11/9/19, 16:39:11.903 [NOTICE] DisableNetwork is set. Tor will not make or
accept non-control network connections. Shutting down all existing
connections.
11/9/19, 16:39:11.903 [NOTICE] DisableNetwork is set. Tor will not make or
accept non-control network connections. Shutting down all existing
connections.
11/9/19, 16:39:11.903 [NOTICE] Opening Socks listener on 127.0.0.1:9150
11/9/19, 16:39:11.903 [NOTICE] Opened Socks listener on 127.0.0.1:9150
11/9/19, 16:39:11.903 [NOTICE] Renaming old configuration file to
"/home/toto/tor-browser_en-US/Browser/TorBrowser/Data/Tor/torrc.orig.1"
11/9/19, 16:39:12.885 [NOTICE] Bootstrapped 1% (conn_pt): Connecting to
pluggable transport
11/9/19, 16:39:12.887 [NOTICE] Bootstrapped 2% (conn_done_pt): Connected
to pluggable transport
11/9/19, 16:40:06.330 [WARN] Proxy Client: unable to connect to
$IP1:$PORT1 ("general SOCKS server failure")
11/9/19, 16:40:12.957 [WARN] Proxy Client: unable to connect to
$IP2:$PORT2 ("general SOCKS server failure")
11/9/19, 16:40:13.120 [WARN] Proxy Client: unable to connect to
$IP3:$PORT3 ("general SOCKS server failure")
11/9/19, 16:41:10.165 [WARN] Proxy Client: unable to connect to
$IP1:$PORT1 ("general SOCKS server failure")
11/9/19, 16:41:14.240 [WARN] Proxy Client: unable to connect to
$IP2:$PORT2 ("general SOCKS server failure")
11/9/19, 16:41:20.420 [WARN] Proxy Client: unable to connect to
$IP3:$PORT3 ("general SOCKS server failure")
}}}
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32439>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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