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46 by Teddy Hogeborn
* network-protocol.txt: New.
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Network Protocol Version 1
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The server announces itself as an IPv6 Zeroconf service of type
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"_mandos._tcp".  A connecting client sends a line of text where the
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first whitespace-separated field is the protocol version, which
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currently is "1".  The client and server then start a TLS handshake,
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with the unusual property that the server program acts as a TLS
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"client" and the connecting client acts as a TLS "server".  In this
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TLS handshake the client must supply an OpenPGP certificate, and the
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fingerprint of this certificate is used by the server to look up (in a
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list read from file at start time) which binary blob to give the
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client.  No other authentication or authorization is done by the
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server.  After the binary blob is sent by the server to the client,
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the server closes the connection.