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Mutual authentication describes a process in which each side of an electronic communication verifies the authenticity of the other We are accustomed to the idea of having to
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9: Authentication and Remote Access
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authenticate ourselves to our ISP before we access the Internet, generally through the use of a user ID/password pair, but how do we actually know that we are really communicating with our ISP and not some other system that has somehow inserted itself into our communication (a man-in-the-middle attack) Mutual authentication would provide a mechanism for each side of a client/server relationship to verify the authenticity of the other to address this issue
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Authorization is the process of permitting or denying access to a specific resource Once identity is confirmed via authentication, specific actions can be authorized or denied Many types of authorization schemes are used, but the purpose is the same: determine whether a given user who has been identified has permissions for a particular object or resource being requested This functionality is frequently part of the operating system and is transparent to users The separation of tasks, from identification to authentication to authorization, has several advantages Many methods can be used to perform each task, and on many systems several methods are concurrently present for each task Separation of these tasks into individual elements allows combinations of implementations to work together Any system or resource, be it hardware (router or workstation) or a software component (database system) that requires authorization can use its own authorization method once authentication has occurred This makes for efficient and consistent application of these principles
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IEEE 8021x is an authentication standard that supports communications between a user and an authorization device, such as an edge router IEEE 8021x is used by all types of networks, including Ethernet, token ring, and wireless This standard describes methods used to authenticate a user prior to granting access to an authentication server, such as a RADIUS server 8021x acts through an intermediate device, such as an edge switch, enabling ports to carry normal traffic if the connection is properly authenticated This prevents unauthorized clients from accessing the publicly available ports on a switch, keeping unauthorized users out of a LAN Until a client has successfully authenticated itself to the device, only Extensible Authentication Protocol over LAN (EAPOL) traffic is passed by the switch EAPOL is an encapsulated method of passing EAP messages over 802 frames EAP is a general protocol that can support multiple methods of authentication, including one-time passwords, Kerberos, public keys, and security device methods such as smart cards Once a client successfully authenticates itself to the 8021x device, the switch opens ports for normal traffic At this point, the client can communicate with the system s AAA method, such as a RADIUS server, and authenticate itself to the network
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RADIUS
Remote Authentication Dial-In User Service (RADIUS) is a protocol that was developed originally by Livingston Enterprises (acquired by Lucent) as an AAA protocol It was submitted to the Internet Engineering Task Force (IETF) as a series of RFCs: RFC 2058 (RADIUS specification), RFC 2059 (RADIUS accounting standard), and updated RFCs 2865 2869 are now standard protocols The IETF AAA Working Group has proposed extensions to RADIUS (RFC 2882) and a replacement protocol DIAMETER (Internet Draft DIAMETER Base Protocol) RADIUS is designed as a connectionless protocol utilizing User Datagram Protocol (UDP) as its transport level protocol Connection type issues, such as timeouts, are handled by the RADIUS application instead of the transport layer RADIUS utilizes UDP ports 1812 for authentication and authorization and 1813 for accounting functions (see Table 9-1 in the Review section) RADIUS is a client/server protocol The RADIUS client is typically a network access server (NAS) The RADIUS server is a process or daemon running on a UNIX or Windows Server machine Communications between a RADIUS client and RADIUS server are encrypted using a shared secret that is manually configured into each entity and not shared over a connection Hence, communications between a RADIUS client (typically a NAS) and a RADIUS server are secure, but the communications between a user (typically a PC) and the RADIUS client are subject to compromise This is important to note, for if the user s machine (the PC) is not the RADIUS client (the NAS), then communications between the PC and the NAS are typically not encrypted and are passed in the clear
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