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Split the behavior of node_supports_ed25519_link_authentication().

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Before, this function meant "can we connect to this node and
authenticate it using its ed25519 key?"  Now it can additionally
mean, "when somebody else connects to this node, do we expect that
they can authenticate using the node's ed25519 key"?

This change lets us future-proof our link authentication a bit.

Closes ticket 20895.  No backport needed, since ed25519 link
authentication support has not been in any LTS release yet, and
existing releases with it should be obsolete before any releases
without support for linkauth=3 are released.
This commit is contained in:
Nick Mathewson
2017-09-11 10:00:11 -04:00
parent 362bc880b1
commit 3124c921e7
9 changed files with 36 additions and 17 deletions
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changes/ticket20895
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o Minor features (forward-compatibility):
- If a relay supports some link authentication protocol that we do not
recognize, then include that relay's ed25519 key when telling other
relays to extend to it. Previously, we treated future versions as if
they were too old to support ed25519 link authentication.
Closes ticket 20895.