[tor-bugs] #5458 [Tor Client]: Clients should warn and disable guards responsible for excessive circuit failures

[Tor Bug Tracker & Wiki]

#5458: Clients should warn and disable guards responsible for excessive circuit
failures
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 Reporter:  mikeperry        |          Owner:  mikeperry         
     Type:  defect           |         Status:  needs_revision    
 Priority:  major            |      Milestone:  Tor: 0.2.3.x-final
Component:  Tor Client       |        Version:                    
 Keywords:  MikePerry201205  |         Parent:  #5456             
   Points:  6                |   Actualpoints:                    
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Changes (by mikeperry):

  * milestone:  Tor: 0.2.2.x-final => Tor: 0.2.3.x-final


Old description:

> In https://lists.torproject.org/pipermail/tor-dev/2012-March/003361.html,
> the raccoon gave us some bounds to determine unreasonable amounts of
> circuit failure that indicate a potential tagging attack.
>
> Tor Clients should emit warnings if they observe anywhere near this
> amount of circuit failure. His bound for tagging was 80%, but frankly if
> even 50% of my circuits are failing, I would want tor to tell me.
>
> Maybe >50% failure should notice and >66% failure should warn?

New description:

 In https://lists.torproject.org/pipermail/tor-dev/2012-March/003361.html,
 the raccoon gave us some bounds to determine unreasonable amounts of
 circuit failure that indicate a potential tagging attack.

 Tor Clients should emit warnings and disable guards if they observe
 anywhere near this amount of circuit failure per guard. His bound for
 tagging was 80%, but frankly if even 50% of my circuits are failing, I
 would want tor to tell me.

 Maybe >50% failure should notice and >66% failure should warn?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/5458#comment:17>
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