Don't roam peer endpoint on cookie replies#489
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BoringTun updates a peer's endpoint on any authenticated packet, including
cookie replies. Upstream WireGuard implementations only roam on handshake
initiations/responses and transport data. An attacker could abuse this to
fingerprint which WireGuard implementation a peer uses. An attacker that can
observe the WireGuard traffic between two peers could also replay a recently
captured cookie reply from a spoofed source, incorrectly updating the peer's
endpoint address.