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Re: [tor-bugs] #13667 [Tor]: Prevent port scanning of hidden services
#13667: Prevent port scanning of hidden services
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Reporter: arma | Owner:
Type: defect | Status: new
Priority: normal | Milestone: Tor: 0.2.5.x-final
Component: Tor | Version:
Resolution: | Keywords: SponsorR tor-hs
Actual Points: | Parent ID:
Points: |
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Comment (by dgoulet):
Started poking around a bit with this one. Here is what I think is
possible.
1) Send back "END_STREAM_REASON_CONNECTREFUSED" which does *not* fully
tell if the port is open or not. It could be that the service *might*
exists but misconfigured or not started.
2) Drop the circuit with no reason which seems like a firewall with a DROP
policy. However, I think it's pretty easy to link that to a "close port"
for HS.
3) Send back a mysterious reason with "END_STREAM_REASON_MISC" but I think
it is also too easy to associate that reason with a closed port for HS.
Usually firewall have two policies either DROP or REJECT (that sends a TCP
reset) so at best I think we can make port scanning harder but not
completely stop it. I would advocate for 1) here since it's actually a
true and valid reason if the port is not supported by the HS and the other
side (client) can't really confirm if it's a problem of the remote service
or HS port.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13667#comment:2>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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