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cmd/tailscale,tka: implement compat for TKA messages, minor UX tweaks

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Signed-off-by: Tom DNetto <tom@tailscale.com>
This commit is contained in:
Tom DNetto
2022-12-13 09:33:13 -08:00
committed by Tom
parent c4e262a0fc
commit 8724aa254f
3 changed files with 31 additions and 10 deletions
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15
tka/state.go
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@@ -29,9 +29,6 @@ type State struct {
// DisablementSecrets are KDF-derived values which can be used
// to turn off the TKA in the event of a consensus-breaking bug.
//
// TODO(tom): This is an alpha feature, remove this mechanism once
// we have confidence in our implementation.
DisablementSecrets [][]byte `cbor:"2,keyasint"`
// Keys are the public keys currently trusted by the TKA.
@@ -217,9 +214,15 @@ func (s State) applyVerifiedAUM(update AUM) (State, error) {
return out, nil
default:
// TODO(tom): Instead of erroring, update lastHash and
// continue (to preserve future compatibility).
return State{}, fmt.Errorf("unhandled message: %v", update.MessageKind)
// An AUM with an unknown message kind was received! That means
// that a future version of tailscaled added some feature we don't
// understand.
//
// The future-compatibility contract for AUM message types is that
// they must only add new features, not change the semantics of existing
// mechanisms or features. As such, old clients can safely ignore them.
out := s.cloneForUpdate(&update)
return out, nil
}
}