[tor-bugs] #8742 [Tor]: Byte history leaks information about local usage/hidden services

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#8742: Byte history leaks information about local usage/hidden services
-------------------------+-------------------------------------------------
     Reporter:           |      Owner:
  alphawolf              |     Status:  new
         Type:  defect   |  Milestone:  Tor: 0.2.6.x-final
     Priority:  major    |    Version:  Tor: 0.2.4.12-alpha
    Component:  Tor      |   Keywords:  byte-history stats tor-hs privacy
   Resolution:           |  tor-relay 026-triaged-1
Actual Points:           |  Parent ID:
       Points:           |
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Changes (by andrea):

 * keywords:  byte-history stats tor-hs privacy tor-relay 024-backport =>
     byte-history stats tor-hs privacy tor-relay 026-triaged-1


Comment:

 There's a complicated solution here:

 1.) Keep track at the level of the number of bytes that go out as cells
 before the channel layer by cause (relay vs. local client vs. hidden
 service)
 2.) Calculate proportions and apply them to the raw numbers that go over
 the wire so we only report the amortized number of bytes due to relay
 activity

 This is probably too complicated to be worth it.  We should deprecate this
 and warn in the log file if we're running a relay and a hidden service.
 Since this is easy, let's keep it in 0.2.6.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8742#comment:6>
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