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The Server Hello Done Message
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As the name implies, the server hello done message is sent by the server to the client to indicate the end of the server hello and to signal that no further associated server hello messages are coming. After this message is sent, the server waits for the client to respond. On receipt of the server hello done message, the client should verify the certificate and any certificate chain sent by the server (if required) and should verify that all server hello parameters received are acceptable.
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The Client Certificate Message
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The client certificate message is the first message that a client can send after a server hello done message is received, and it is sent only if the server requests a certificate. If the client does not have a suitable certificate (for example, an X.509v3 client certificate) to send, it should send a no_certificate alert instead. Although this alert is only a warning, it is a matter of the server s discretion whether to continue or terminate communications.
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The Client Key Exchange Message
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Like the server key exchange message, the client key exchange message allows the client to send key information to the server. Unlike the server key exchange message, however, this key information pertains to a symmetric-key algorithm that both parties will use for the session.
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Without the information contained in this message, communications cannot continue. The content of this message depends on the type of key exchange, as follows:
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Ephemeral or Anonymous Diffie-Hellman The client provides its own Diffie-Hellman public parameters to the server.
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The Certificate Verify Message
The certificate verify message is used to provide explicit verification of a client certificate. When using client authentication, the server authenticates the client using the private key. This message contains the premaster secret key signed with the client s private key. The server validates the key against the client s certificate. The server is not required to authenticate itself to the client. Because the pre-master secret is sent to the server using the server s public key, only the legitimate server can decrypt it with the corresponding private key.
Fortezza The client calculates public parameters using the public key in the server s certificate along with private parameters in the client s token. These parameters are then sent to the server.
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RSA The client generates a 48-byte pre-master secret, which it encrypts by using either the public key from the server s certificate or a temporary RSA key from a server key exchange message. This result is then sent to the server to compute the master secret key. (Computation of the master secret is discussed later in this chapter under Cryptographic Computations. )
Network and Transport Security Protocols
The Finished Message
Next, the client sends a change cipher spec message, followed immediately by the finished message. When the server receives the finished message, it too sends out a change cipher spec message and then sends its finished message. At this point the handshake protocol is complete and the parties can begin to transfer application data securely. Be aware that the finished message is the first to be protected with the just-negotiated algorithms, keys, and secrets. As a result, the communicating parties can verify that the key exchange and authentication processes were successful. No acknowledgment of the finished message is required; parties can begin sending encrypted data immediately after sending the finished message. Recipients of finished messages must verify that the contents are correct.
NOTE:
The change cipher spec message is actually part of the change cipher spec protocol and not the handshake protocol.
Ending a Session and Connection
Before the end of communications, the client and the server must share knowledge that the connection is ending. This arrangement protects the session from a possible truncation attack, whereby an attacker tries to compromise security by prematurely ending communications. Either party can terminate the session by sending a close_notify alert before closing its own write session. When such an alert is received, the other party must send its own close_notify alert and close down immediately, discarding any pending writes.
NOTE:
If the SSL session is closed before either party sends a close_notify message, the session cannot be resumed.
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