[tor-bugs] #17716 [Tor]: Do clients need to do authority clock checks?

[Tor Bug Tracker & Wiki]

#17716: Do clients need to do authority clock checks?
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 Reporter:  teor         |          Owner:
     Type:  enhancement  |         Status:  needs_revision
 Priority:  Medium       |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor          |        Version:
 Severity:  Normal       |     Resolution:
 Keywords:               |  Actual Points:
Parent ID:  #4483        |         Points:
  Sponsor:               |
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Changes (by teor):

 * status:  needs_review => needs_revision


Comment:

 I spoke with nickm on IRC:

 We can warn if the time is wrong whenever we download the consensus, as
 long as we say who is giving us the time, and that they could be wrong or
 lying.

 We might also want to mention whether they're a normal directory,
 fallback, or authority.
 (We should probably also limit warnings to once per day.)

 This allows us to:
 * prefer fallback directories when multiple connections are downloading
 * initiate connections to a fallback directory first (and then try an
 authority after a delay)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17716#comment:2>
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