#16387: Improve reachability of hidden services on mobile phones
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Reporter: asn | Owner:
Type: enhancement | Status: new
Priority: Medium | Milestone: Tor: 0.2.???
Component: Core Tor/Tor | Version:
Severity: Normal | Resolution:
Keywords: tor-hs | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor: SponsorR-can
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Changes (by timonh):
* severity: => Normal
Comment:
I recently analyzed the behavior of Hidden Services (HS) when their IP
address changes and identified the following problems.
1. A client connected to a HS doesn't notice, that the established
circuit is broken when the HS changes it's address. This happens because
the circuit won't be closed until the entry guard of the HS detects a TCP
timeout and sends a destroy cell down the circuit. The problem can be
handled by the application itself by using own acknowledgments and closing
the circuit when it detects a timeout. The circuit can be closed by using
the Tor Control Protocol (use GETINFO stream-status to find the id and
CLOSECIRCUIT to close it).
2. A HS has to notice, that it's own connections are broken after an IP
address change so it can reestablish circuits to the introduction points.
On linux this lasts until TCP reports a timeout which can take quite long.
On Android connections get killed by the OS when an interface changes.
3. On Android I noticed, that an HS chose new introduction points after
an IP change because Tor thought they were down. The issue seems to be
addressed here: [https://trac.torproject.org/projects/tor/ticket/8239
#8239].
4. Another related problem is described in:
[https://trac.torproject.org/projects/tor/ticket/16966 #16966]. It may
result in a 5 minutes waiting time when a HS reuses it's introduction
points after a downtime.
Any other opinions on how these problems can be solved?
I'm currently working on [https://github.com/kit-tm/PTP] and therefore
interested in making Hidden Services work smooth on mobile devices
(particularly Android).
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16387#comment:5>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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