Opened 6 years ago

Last modified 3 years ago

#13669 new defect

disable "retry DNS on new circuit" for web content

Reported by: arthuredelstein Owned by: tbb-team
Priority: Medium Milestone:
Component: Applications/Tor Browser Version:
Severity: Normal Keywords:
Cc: gk, mcs, isis Actual Points:
Parent ID: Points:
Reviewer: Sponsor:


From mikeperry's comment on ticket:5752#comment:7

isis just noted in #tor-dev that Tor retries failed DNS queries on other circuits. It appears that we do this for failed stream attempts too. I agree that's a bad property because it allows a web adversary to cause your browser to keep making new circuits until you pick one that uses its middle node.

We should ensure we disable this "retry on new circuit" behavior for content elements of a given URL bar, so that at least content elements don't get to cause you to create tons of circuits. Once a circuit can load a top-level url correctly, it should be considered reliable enough not to abandon if a DNS or other stream times out. This might actually require a new Tor child ticket and patch, though...

It's not clear what (if anything) we should change about the initial URL bar load behavior, though. Perhaps it is safe to remain unchanged, because Tor would at least rate limit that properly before failing the page load.

Child Tickets

Change History (5)

comment:1 Changed 6 years ago by arthuredelstein

Component: - Select a componentTor Browser
Owner: set to tbb-team

comment:2 Changed 6 years ago by gk

Cc: gk added

comment:3 Changed 6 years ago by mcs

Cc: mcs added

comment:4 Changed 6 years ago by isis

Cc: isis added

comment:5 Changed 3 years ago by teor

Severity: Normal

Set all open tickets without a severity to "Normal"

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