Use the same fallback directory mirror to bootstrap

If Tor always tries to use the same fallback directory mirror to bootstrap (when the consensus expires because Tor isn't used), fewer servers learn about Tor clients, and a Tor client is less likely to download from a bad fallback directory mirror.

This is low priority, as most Tor clients only bootstrap once [citation needed].

changed milestone to %Tor: unspecified

added component::core tor/tor enumeration-resistence fallback milestone::Tor: unspecified parent::7798 points::medium/large post-prop271 priority::low severity::normal status::new tor-guard type::enhancement labels

It is impossible that we will fix all 226 currently open 028 tickets before 028 releases. Time to move some out. This is my second pass through the "new" and tickets, looking for things to move to 0.2.9.

Trac:
Milestone: Tor: 0.2.8.x-final to Tor: 0.2.9.x-final

Trac:
Reviewer: N/A to N/A
Points: N/A to medium/large

tickets market to be removed from milestone 029

Trac:
Milestone: Tor: 0.2.9.x-final to Tor: 0.2.???

Trac:
Parent: #17158 (moved) to N/A

This might not be a good idea, because it enables attacks where a fallback continues to deliver subtly bad (or slow) consensuses to its clients.

We'd need to implement these checks carefully.

#7798 (moved) might achieve this without some of the drawbacks.

Trac:
Parent: N/A to #7798 (moved)

Milestone renamed

Trac:
Milestone: Tor: 0.2.??? to Tor: 0.3.???

Finally admitting that 0.3.??? was a euphemism for Tor: unspecified all along.

Trac:
Keywords: N/A deleted, tor-03-unspecified-201612 added
Milestone: Tor: 0.3.??? to Tor: unspecified

Replying to teor:

#7798 (moved) might achieve this without some of the drawbacks.

Agreed, I am a fan of solving this one by solving #7798 (moved).

Remove an old triaging keyword.

Trac:
Keywords: tor-03-unspecified-201612 deleted, N/A added

It wouldn't be so hard to make our existing code handle this, I think.

Trac:
Keywords: N/A deleted, tor-guard post-prop271 fallback enumeration-resistence added

moved to tpo/core/tor#18084 (closed)