AAA and Network Security for Mobile Access in .NET

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AAA and Network Security for Mobile Access
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The second phase accomplishes the main functions intended for EAP-TTLS, such as client authentication, negotiation of cipher suites for client AP communications and key material distribution. Again, note that the secure tunnel ends at the TTLS server (not at the AAAH server); the TTLS server de-tunnels the encrypted AVPs and determines whether they are related to client authentication or to other purposes. We will go through an example on how the client authentication according CHAP is performed later on. For now, we note that, when the data is related to client authentication, if the TTLS server does not have access to client credentials, the TTLS server is not able to perform the client authentication. In such cases, it forwards the de-tunneled data to the AAA server using a secure AAA protocol transaction. This architecture removes the burden of supporting and understanding EAP-TTLS from the legacy AAA servers, since only the TTLS server deals with EAP-TTLS signaling. At the same time the TTLS server does not have to deal with the details of client authentication. The TTLS server simply waits for the AAAH server to approve or reject client authentication and issues EAP-Success or Failure based on the results from the AAAH server. Note, however, that if client authentication requires multiple exchanges with the client, the TTLS server needs to forward the exchange data to the intended recipient. For instance, for CHAP authentication, the TTLS server forwards the challenge issued by the AAAH server towards the client. Any keying material that is required for the protection of subsequent data connection between the client and the AP is generated in the second phase of EAP-TTLS. However, this keying material is still generated from the TLS master secret, client random value and server random value that were generated between the client and the TTLS server during the first phase of EAP-TTLS negotiations (see TLS handshake in 4). The keying material is first generated at the TTLS server but is transmitted to NAS only when the TTLS server receives an indication of a successful client authentication from the AAAH server. The TTLS sends this key material to the NAS over a AAA protocol (rather than over EAP-TTLS) encrypted using the security association that exists between the NAS and the TTLS server. Once the transfer is complete, the client and the NAS share a security association and key material can active this association to secure their communications.
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10.3.2.4 Session Resumption: EAP-TTLS Support for Mobility EAP-TTLS specification also provides support for a quicker negotiation if the client and TTLS server have already established a session earlier. Assuming that the session is not stale and the server has not completely erased all the records on the session, the client can invite the server to resume a previous session by including the identifier for the session (session ID) in a client hello message, which is the first message in TLS handshake. As mentioned earlier, the TLS session is established between the client and the TTLS server and hence the identity of the current NAS (or AP) does not affect any of the session characteristics. After handing over to a new AP, the client simply resumes the earlier session with the server (the TTLS server is the same) without the need for a new tunneled authentication to the TTLS server. Note that the TTLS server does not retain all the information regarding the key distribution for the client and therefore, the client must send some of the related information to the server. Also the TTLS server must still convey the session authorization information, such as the maximum allowed bandwidth, the maximum session time, and so on, to the new AP. The reader is referred to [EAPTTLSDR] for more details.
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