[tor-bugs] #6314 [TorBirdy]: prevent leak via Date header field (local timestamp disclosure)

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#6314: prevent leak via Date header field (local timestamp disclosure)
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 Reporter:  tagnaq    |          Owner:  ioerror
     Type:  defect    |         Status:  needs_review
 Priority:  High      |      Milestone:
Component:  TorBirdy  |        Version:
 Severity:  Normal    |     Resolution:
 Keywords:            |  Actual Points:
Parent ID:  #9131     |         Points:
  Sponsor:            |
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Changes (by arthuredelstein):

 * status:  new => needs_review
 * severity:   => Normal


Comment:

 Here's a JS torbirdy patch that allows us to round the Date header down to
 the nearest minute. It uses a custom Date header emitter that overrides
 Thunderbird's default Date header emitter.

 https://github.com/arthuredelstein/torbirdy/commit/6314

 (Alternatively, we could use the custom emitter to cause the Date header
 to be blank, randomized, rounded to the nearest hour, day, etc.)

 This torbirdy patch should mean we won't need a patch for
 https://bugzil.la/980573. Thanks to jcranmer for helping me understand the
 Thunderbird logic.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6314#comment:17>
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