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Figure 10.10 Architecture for EAP-SIM authentication
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10.4 Use of EAP in 802 Networks
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We mentioned that for wireless links EAP is carried over link layer protocols such as PPP or EAPOL. IEEE 802 LANs provide their own inbuilt framing support for traffic the way PPP does for dial-up and cellular data links. The link characteristics are known in advance and network protocols and features are carried inside LAN 802 headers, so the LCP or NCP type functions of PPP are not needed either. For those reasons, authentication functionality was one of the most important features missing from 802 protocols when it came to controlling access over 802 links. This was the motivation behind the creation of 802.1X: to protect the network from unauthorized access by users trying to access Ethernet connections that were physically accessible to the public. Hence authentication and access control at the network point of presence became the main goal of 802.1X. It should be noted that the recent popularity of 802.1X-based methods for providing security within 802.11 WLANs does not mean that 802.1X is only designed for 802.11. On the contrary, 802.1X is designed for all 802 type links. In fact, 802.1X design started before 802.11 specifications started with wired connections in mind, even though the latest version of 802.1X [8021X2004] was published yesterday (time of writing: 9:20 pm December 15, 2004) to facilitate the use of 802.1X with 802.11.
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10.4.1 802.1X Port-Based Authentication
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The 802.1x model is a logical model consisting of a switched Ethernet hub with multiple logical switches, where there is one logical switch per user. The reason for insisting on the term logical is that, for wireless networks, such as 802.11 networks, there is no physical switch as opposed to wired 802 networks. 802.11 is like an access point that is dealing with multiple users trying to connect. As a user tries gain access to the network, it is as though it is trying to logically connect to the hub. A software port called the port access entity (PAE) is created for the user, where each port includes an authenticator and a switch (shown in Figure 10.11). The switch is open or disconnected to illustrate the controlled ports, i.e. ports that are used for variety of applications and services. This switch remains open (port closed) until the authentication is complete and will close (port open) when the user is authorized to use these services. The uncontrolled port is always open to allow for transit of authentication exchanges. For this reason, 802.1X is referred to as a port-based authentication.
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10.4.1.1 EAPOL in 802.1X and Interaction with RADIUS The logical point to implement 802.1X is the access point. However, the AP generally only includes the authenticator and not the authentication server (all the user information). So the AP only marginally understands the EAP messages carried by 802.1X and it is difficult for the authenticator to understand all the authentication methods negotiated during the EAP message exchange. Therefore, the authenticator simply forwards the EAP messages to the authentication server (RADIUS server) as described in generic EAP-XXX model. Note that 802 in general includes any type of layer-2 network, but IEEE does not get involved with higher layer protocols. As a result, even though some RADIUS interactions are defined, the amount of interaction with RADIUS server is nowhere near those for EAP-TLS and EAP-TTLS. As explained earlier, the EAP messages between supplicant and authentication server are encapsulated in EAPOL messages from supplicant to authenticator (using 802.1X), and in RADIUS when going to the authentication server.
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10.4.1.2 Security Flaws of 802.1X, WPA/RSN and 802.1aa The issue with 802.1X (since it is designed for wired networks) is that it is mostly concerned with access control, i.e. initial authentication which only provides a one-time protection, whereas in wireless 802.11 networks, the user s channel can easily be hijacked and therefore we need ongoing security protection, such as encryption as well as message integrity protection (and time synchronization) and most of this needs to be set up at the time of initial authentication. Several task groups and specifications such as IEEE 802.1aa, IEEE 802.11i, IEEE 802.1AE, and IEEE 802.1af have attempted solutions to these flaws. We refer the reader to the IEEE standardization process and the large amount of literature on the subject and do not get into its details due to the lack of stability in the specifications.
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10.4.2 Lightweight Extensible Authentication Protocol (LEAP)
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To facilitate wireless network access for mobile users, Cisco developed a lightweight EAP authentication variant that allows a user to use its Cisco wireless LAN (WLAN) network interface card (NIC) to perform a simple Windows-type user name and password login to gain access to the network as if it was connected through wired Ethernet. The result is what is called Lightweight EAP, LEAP, that can support both Windows Active Directory databases and RADIUS infrastructures. LEAP takes some ideas from the Microsoft version of CHAP, commonly known as MS-CHAP in that it uses a challenge/response mechanism for authentication. However, LEAP provides a mutual authentication, through which both the authentication server and the client challenge each other. From a protocol standpoint, on the client side, LEAP is designed based on IEEE 802.1X standards and integrates well with the 802.11 MAC procedures such as the association process. On the wired side, LEAP attempted to be consistent with the earlier specification of transport of EAP over RADIUS [RADEXT2869]. LEAP implements the Wired Equivalent Privacy (WEP) security mechanism, which is a symmetric key-based encryption mechanism to protect traffic between the client and the WLAN AP. We will not go through WEP in this text due to the massive criticism that WEP has received. Although LEAP uses WEP for wireless link encryption, it provides its own key
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