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Re: [tor-bugs] #25812 [Community/Relays]: Update the tor relay guide about ed25519 changes

#25812: Update the tor relay guide about ed25519 changes
------------------------------+--------------------------
 Reporter:  ffmancera         |          Owner:  nusenu
     Type:  enhancement       |         Status:  reopened
 Priority:  Medium            |      Milestone:
Component:  Community/Relays  |        Version:
 Severity:  Normal            |     Resolution:
 Keywords:                    |  Actual Points:
Parent ID:                    |         Points:
 Reviewer:                    |        Sponsor:
------------------------------+--------------------------
Changes (by teor):

 * status:  closed => reopened
 * resolution:  fixed =>


Comment:

 Replying to [comment:7 nusenu]:
 >
 https://trac.torproject.org/projects/tor/wiki/TorRelayGuide?action=diff&version=219
 >
 > please reopen if you are unhappy with this change

 Thanks, but the text is too definite:
 {{{
 Tor relays are not allowed to downgrade their tor version from a
 [[org/teams/NetworkTeam/CoreTorReleases#Listofreleases|supported]] to an
 unsupported major version of tor. Relays that do attempt do downgrade will
 be rejected from the network automatically.
 }}}

 Relays can't downgrade from a version that supports ed25519 keys, to a
 version that ignores them. So relays that downgrade from 0.2.9 (or later)
 to 0.2.8 (or earlier) will be rejected.

 But relays that move between two versions that are both 0.2.9 or later
 will not be rejected from the consensus. (For example, 0.3.2 is supported,
 and 0.3.0 is not supported, but the downgrade still works.)

 Here's a more accurate version:
 {{{
 Tor relays should not downgrade their tor version from a
 [[org/teams/NetworkTeam/CoreTorReleases#Listofreleases|supported]] to an
 unsupported version of tor. Some unsupported versions are insecure. Relays
 that attempt to downgrade to an insecure version will be rejected from the
 network automatically.
 }}}

 The authorities implement a number of different version checks, and this
 text covers past and future checks. Most of the time, we just reject old
 versions. But sometimes it's more complicated (like ed25519).

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25812#comment:8>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

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