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Add certificate serial number (sn) to mDNS TXT record requirements #360

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Add certificate serial number (sn) to mDNS TXT record requirements #360

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7 changes: 6 additions & 1 deletion network.bs
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Expand Up @@ -175,6 +175,11 @@ keys and values:
:: An alphanumeric, unguessable token consisting of characters from the set
`[A-Za-z0-9+/]`.

: sn
:: The [=certificate serial number=] of the advertising agent, encoded as a
base64 string according to [[!RFC4648]]. This is required for listening
agents to compute the [=agent hostname=] for TLS SNI.

Note: `at` prevents off-LAN parties from attempting authentication; see
[[#remote-active-mitigations]]. `at` should have at least 32 bits of true
entropy to make brute force attacks impractical.
Expand Down Expand Up @@ -613,7 +618,7 @@ considered public:

1. IP addresses and ports used by the Open Screen Network Protocol.
1. Data advertised through mDNS, including the display name prefix, the
certificate fingerprint and serial number, and the metadata version.
certificate fingerprint, certificate serial number, and the metadata version.

### Cross Origin State Considerations ### {#cross-origin-state}

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