Re: [tor-bugs] #13667 [Tor]: Prevent port scanning of hidden services

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#13667: Prevent port scanning of hidden services
------------------------+------------------------------------------
     Reporter:  arma    |      Owner:
         Type:  defect  |     Status:  reopened
     Priority:  major   |  Milestone:  Tor: 0.2.5.x-final
    Component:  Tor     |    Version:
   Resolution:          |   Keywords:  SponsorR tor-hs 025-backport
Actual Points:          |  Parent ID:
       Points:          |
------------------------+------------------------------------------
Changes (by dgoulet):

 * status:  closed => reopened
 * resolution:  not a bug =>


Comment:

 Ok so I'm here with syverson, robjansen and Roger discussing about this
 one and a possible "attack" came up. Here is the scenario:

 Alice has a long lived connection to let say an IRC server on aaaa.onion
 port 6667. Now, Alice receives an email saying "Hey, can you connect to
 aaaa.onion:6668?" for which the HS does have that port in its exit policy.
 So Alice, connects, the tor client reuses the RP circuit but on a wrong
 port and blam the circuit is killed thus the long lasting connection.

 A solution we thought of here is to pin a *good* virtual port on a circuit
 and not accepting connections on it with an other port.

 Makes sense?

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13667#comment:26>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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