[tor-bugs] #23361 [Core Tor/Tor]: prop224: client can pick super old rendezvous points

Tor Bug Tracker & Wiki blackhole at torproject.org
Tue Sep 5 12:21:47 UTC 2017

#23361: prop224: client can pick super old rendezvous points
 Reporter:  asn              |          Owner:  (none)
     Type:  defect           |         Status:  needs_revision
 Priority:  High             |      Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/Tor     |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  prop224, tor-hs  |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:  asn              |        Sponsor:  SponsorR-can

Comment (by dgoulet):

 Replying to [comment:10 nickm]:
 > Also, this seems to violate proposal 224 section 4.3, which says that we
 _can_ use older rendezvous points.  Why  did we decide not to do that?

 That is a spec issue that needs to be updated. Back at the Montreal hidden
 service meeting, we realized that we needed legacy rendezvous point to
 relay an HS cell that had more bytes than the 20 bytes rendezvous cookie
 and that patch got in 0.2.9 (commit `be0e1e9e2f6`). So, HS client can
 *not* use RPs below that version which is `HSRend=2`.

 *HOWEVER*, we should most certainly pad all RENDEZVOUS cells in the legacy
 HS system so v2 and v3 cells look "alike".

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23361#comment:11>
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