[tor-bugs] #2576 [Analysis]: Can we try to extend from the bridge to a website and learn if the website is reachable?

[Tor Bug Tracker & Wiki]

#2576: Can we try to extend from the bridge to a website and learn if the website
is reachable?
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 Reporter:  arma      |          Owner:
     Type:  task      |         Status:  closed
 Priority:  Medium    |      Milestone:
Component:  Analysis  |        Version:
 Severity:  Normal    |     Resolution:  wontfix
 Keywords:            |  Actual Points:
Parent ID:            |         Points:
  Sponsor:            |
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Comment (by teor):

 Replying to [comment:7 rransom]:
 > As I mentioned on #3520, all `TRUNCATED` cells currently result in a
 `CIRC FAILED` event with `REMOTE_REASON=OR_CONN_CLOSED`.  That will need
 to be fixed before we can hope to distinguish between ‘unable to complete
 TCP handshake’ and ‘opened TCP connection but got wrong TLS
 handshake/cert’.

 Making this change would enable all sorts of port scanning attacks through
 Tor.

 The fact that we don't distinguish between these cases made #8976 much
 less of a security risk.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/2576#comment:11>
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