[tor-bugs] #30477 [Core Tor/Tor]: Tor should self-test reachability of TCP listeners exposed by PT's

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#30477: Tor should self-test reachability of TCP listeners exposed by PT's
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 Reporter:  ahf                                  |          Owner:  (none)
     Type:  task                                 |         Status:  new
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  unspecified
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-pt, network-team-roadmap-        |  Actual Points:
  november, s30-o23a3                            |
Parent ID:  #30471                               |         Points:
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor30-must
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Comment (by phw):

 Replying to [comment:12 teor]:
 > Replying to [comment:10 nickm]:
 > > > If a transport exposes a TCP port, connect to that TCP port via a
 Tor Exit.
 > >
 > > Question: what if the attacker runs an exit in order find out where PT
 ports are?
 >
 > Bridges already do reachability checks via a random relay's ORPort: so
 we have accepted a similar risk in the past.
 [[br]]
 It may be a good time to re-consider this risk now. Over at #31874, we're
 brainstorming a service that takes as input a bridge line and then tests
 the given bridge. We may want such a service instead of, or in addition to
 Tor self-testing its PT bridge. The downside of this service (which we
 could couple with BridgeDB) doing the testing is that it takes a while
 until the bridge operator learns if their bridge works.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30477#comment:13>
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