[tor-bugs] #16824 [Tor]: Emit a warning message about side channel leaks when using relays as clients

[Tor Bug Tracker & Wiki]

#16824: Emit a warning message about side channel leaks when using relays as
clients
-------------------------------------------------+-------------------------
 Reporter:  starlight                            |          Owner:
     Type:  defect                               |         Status:  new
 Priority:  High                                 |      Milestone:  Tor:
Component:  Tor                                  |  0.2.8.x-final
 Severity:  Normal                               |        Version:  Tor:
 Keywords:  PostFreeze027, 027-backport, mike-   |  0.2.6.10
  can                                            |     Resolution:
Parent ID:                                       |  Actual Points:
  Sponsor:                                       |         Points:
-------------------------------------------------+-------------------------

Comment (by mikeperry):

 Replying to [comment:21 starlight]:
 > Message text is good IMO.
 >
 > Is there any particular reason why it's better to configure the client-
 only relay in bridge mode rather than configure the local-public-relay as
 normal Guard?

 Because if you set the relay a Bridge line, Tor's bootstrapping code uses
 it as the sole source of directory information, and never tries to touch
 the directory authorities. If you set it as Guard, however, your second
 Tor instance will still bootstrap directly from the dirauths. Concealing
 the additional directory authority hits are crucial, since the goal is to
 conceal client activity on the relay itself.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16824#comment:23>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online