[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: 0.2.6.10
 Keywords:  PostFreeze027, 027-backport  |     Resolution:
Parent ID:                               |  Actual Points:
  Sponsor:                               |         Points:
-----------------------------------------+---------------------------------

Comment (by mikeperry):

 Replying to [comment:19 starlight]:
 > Please go ahead and edit as you see fit.
 >
 > A log warning satisfies my concerns.

 Ok. So there's a specific action item here, the log message I am thinking
 about would read something like:
 "You appear to be attempting to use Tor for both relay and client
 functionality at the same time. Unfortunately, a side channel issue (Bug
 #16585) means that this fact will be visible in network traffic patterns.
 If this is a problem for you, we recommend running a second local Tor
 client instance and configuring it to use this relay as a local bridge.
 Your bridge line for this second instance would be: Bridge 127.0.0.1:port
 $IDENTITY_FP"

 If the user doesn't have their dirport set, we'll also need to tell them
 to do that until #12538 is solved, or they won't be able to use their tor
 relay as a bridge.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16824#comment:20>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online