[tbb-bugs] #27590 [Applications/Tor Browser]: Display .onion alt-svc route in the circuit display

Tor Bug Tracker & Wiki blackhole at torproject.org
Sun Jun 2 20:21:52 UTC 2019


#27590: Display .onion alt-svc route in the circuit display
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 Reporter:  mahrud                        |          Owner:  tbb-team
     Type:  defect                        |         Status:  new
 Priority:  Medium                        |      Milestone:
Component:  Applications/Tor Browser      |        Version:
 Severity:  Normal                        |     Resolution:
 Keywords:  tbb-circuit-display, ux-team  |  Actual Points:
Parent ID:  #30024                        |         Points:
 Reviewer:                                |        Sponsor:  Sponsor27-must
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Comment (by gk):

 Replying to [comment:5 gk]:
 > So, here is an interesting issue: If you load the website the first time
 the circuit display actually shows part of the onion circuit (the one the
 client controls) *but* the website still says that the content got loaded
 over the regular Tor circuit. This is true. What happens is that a second
 request is issued for the favicon which uses the onion in the alt-svc
 header which then updates the circuit display even though the content did
 not get loaded over the .onion. What should the display show here?

 This is actually a circuit display issue (which we should deal with,
 though) in the sense that it does not show any alt-svc routing requests at
 all using the Cloudflare .onion service. This happens because once the
 Alt-Svc header is processed the mapping is created and part of that is
 validating it (see: `AltSvcCache::UpdateAltServiceMapping`) which means in
 the https:// case just establishing a connection to the alt-svc host. And
 the circuit display gets in turn updated with the client side rend circuit
 caused by that validation request.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27590#comment:13>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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