Files
Paul Lorenz d84e78ec59 Verify link peer identity against the leaf certificate only
- fingerprints only the leaf certificate whose key the TLS handshake proved
  possession of when verifying a dialing router on an incoming link, instead of
  the whole presented certificate chain
- prevents an enrolled router from being admitted on a link under another
  router's identity by presenting that router's certificate as filler in its
  chain
- adds a unit test covering leaf-only fingerprinting, including the case where a
  filler certificate must not contribute a fingerprint
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