AAA and Network Security for Mobile Access in .NET

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7.2.1.1 Diameter Message Format As shown in Table 7.2, Diameter messages consist of a standard header, and a number of AVPs. In Table 7.2 the header fields are shown in gray. The header fields are as described in the following
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The Version field indicates the Diameter protocol version and is set to 1 for now. The Command flags field specifies 4 flags for now: R flag (stands for Request) flag shows whether the message is a request or a response. P flag (stands for Proxiable) shows if the message can be proxied, relayed or redirected or it must be locally processed. E flag (stands for Error) to show if the message contains protocol or semantic errors. T flag to show that a message can potentially be a retransmitted message after a link fail-over or is used to aid removal of duplicate messages.
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The command code value indicates the command associated with the message, such as abort session request or accounting-answer , and so on. Every Diameter message must contain a command code so that the receiver can determine what action it needs to take for each message. Application ID identifies the specific application the message is used for, such as Mobile IP, accounting and so on. Hop-by-hop identifier field carries an identifier that is used to match request and responses over that hop. The sender of the request must ensure that the identifier is unique over the connection on that hop at any given time. The sender of a response must ensure that the identifier value is the same as that in the corresponding request. End-to-end identifier is an identifier used to detect duplicate messages. The identifier in a response message must match the identifier in the corresponding request message. The identifier must remain locally unique for at least 4 minutes. This identifier and the OriginHost AVP (described later) are used together to detect message duplicates. Note duplicate request could cause duplicate responses but the duplications must not affect any states that were created by the original request.
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7.2.1.2 Diameter Command Code (Message Types) As mentioned earlier, the action to be taken upon reception of each message is defined by the command code in the Diameter message. As described previously, both request and answer
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Table 7.2 Diameter message format and header 0 12 34 56 701 23 45 67 01 234 56 70 12 345 67 Version Command flags Message length Command code Application ID Hop-by-hop identifier End-to-end Identifier AVPs. . . .
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Table 7.3 Common Diameter command codes Command name(s) Capabilities-Exchange Request/Response Disconnect-Peer-Request/ Answer Re-Auth-Request/Answer Abbreviation CER/CEA Code 257 Description Allows for discovery of a peer s identity and its capabilities, such as supported Diameter applications, security mechanisms, etc. Sent to a peer to inform sender s intentions to shut down the transport connection Sent by a server to an access device, providing session service to user, to request the access device to re-authenticate and/or re-authorize the user Sent by the access device that provided the service, on behalf of a user that is terminating a session, to the server that had authorized that session. Sent by a Diameter client to exchange accounting information with its peer.
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messages corresponding to a command type use the same command code, but the request messages set the R flag within the message header. Typically an answer message includes a Result-Code AVP, indicating the result of the processing of the request at the receiver. Examples of some of the more relevant command codes that are defined in Diameter base specification are shown in Table 7.3. Obviously, Table 7.3 does not include all the command codes defined in the Diameter base protocol specification. Furthermore, as mentioned earlier, the base specification leaves the definition of application-specific commands to other documents. For instance, authentication or authorization request/answer commands are defined in NASREQ specification. In the same way, other applications such as Mobile IP or credit control define additional command codes as needed for their operation. We will give examples of those commands when we describe each of these applications. It is a requirement that each Diameter node must support all the command codes described in the Diameter base protocol, but only supports the command codes for the Diameter application it has advertised provide.
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7.2.1.3 Attribute-Value Pair (AVP) Format As mentioned earlier, most of the information to be carried by Diameter in the form of attributes are formatted as attribute-value pairs, commonly known as AVPs. AVPs can arbitrarily be added to messages, as long as the minimum required AVPs for a message are included and no AVP that is specifically excluded for inclusion in that message is added. The AVP format is shown in Table 7.4 with the AVP header in gray: In the following we do not go through the description of every field, as that would be repeating the RFC specification. Instead we go through the fields important for our discussions in this chapter:
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