[tor-bugs] #17178 [Tor]: Single Onion Services: One-Hop Intro Point and Rendezvous

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#17178: Single Onion Services: One-Hop Intro Point and Rendezvous
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 Reporter:  teor                |          Owner:
     Type:  enhancement         |         Status:  needs_revision
 Priority:  High                |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor                 |        Version:
 Severity:  Normal              |     Resolution:
 Keywords:  028-triaged tor-hs  |  Actual Points:
Parent ID:                      |         Points:  large
  Sponsor:  SponsorU            |
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Comment (by asn):

 Replying to [comment:14 teor]:
 > Replying to [comment:13 asn]:
 > > Hello teor, what can I do here to help? What's the current status
 here? I can spend a few hours this week on this ticket.
 >
 > The code works and has been tested using chutney.
 >
 > It doesn't behave correctly when
 RendezvousSingleOnionServiceNonAnonymousServer Is changed at runtime
 (using torrc and a HUP, or over the control port). The current code
 attempts to re-use introduction points and introduction point circuits
 after a HUP. But if the value of
 RendezvousSingleOnionServiceNonAnonymousServer has changed, the circuits
 are the wrong length. Tor should close the circuits and discard the intro
 points (this needs to be coded), then post a fresh descriptor (this likely
 already happens anyway after a config change).
 >

 This can be done yes, but it's some moderate engineering complexity. Are
 we sure we want `RendezvousSingleOnionServiceNonAnonymousServer` to be
 hotpluggable like that? We think HS operators would enjoy that, or can we
 just fail and warn the user if `RSOS` was enabled after a HUP?

 And also there is the opposite direction. What happens if RSOS is disabled
 after a HUP? Then you need to kill all 1-hop circuits and make 3-hop ones?
 Do we want people to think it's so easy to switch between these two modes?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17178#comment:15>
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