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The Mandos server announces itself as a Zeroconf service of type
"_mandos._tcp". The Mandos client sends a line of text where the first
whitespace-separated field is the protocol version, which currently is
"1". The client and server then start a TLS protocol handshake with a
slight quirk: the Mandos server program acts as a TLS "client" while
the connecting Mandos client acts as a TLS "server". The Mandos
client must supply an OpenPGP certificate, and the fingerprint of this
certificate is used by the Mandos server to look up (in a list read
from a file at start time) which binary blob to give the client. No
other authentication or authorization is done by the server.
| Mandos Client | | Mandos Server |
|--------------------------------------------+-----+---------------|
| Connect | | |
| "1\r\n" | -> | |
| TLS handshake | <-> | TLS handshake |
| OpenPGP public key (part of TLS handshake) | -> | |
| | <- | Binary blob |
| | | Close |
|