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16: Authentication, Authorization, and Accounting
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This book focuses on the technology and topologies for designing and implementing an efficient and effective network environment Once you've done that, it's extremely important to protect your investment by allowing only valid users to have access to the network devices One modification to a network device, intentional or unintentional, can result in hours of troubleshooting and network downtime This chapter discusses the precautions you can take as a network administrator to protect against unauthorized access, to control legitimate access, and to track detailed information about the who, what, where, and when of network access We'll introduce some powerful tools you can use to simplify network access control configuration and management Putting the information in this chapter to work will give you another measure of safety for your network equipment
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Cisco's Authentication, Authorization, and Accounting (AAA) Services
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Authentication, Authorization, and Accounting (AAA) are independent security services that, when implemented, will ensure that only appropriate administrators access the network hardware and execute appropriate commands Cisco has grouped these three security functions together to help you configure AAA consistently and better protect your network architecture AAA gives you the access controls you need for your network devices The benefits of using AAA include Increased flexibility and control Scalability Standardized authentication methods Multiple backup systems AAA uses protocols such as RADIUS and TACACS+ to administer its security functions These protocols can be applied to a server that functions as a RADIUS security server, TACACS+ security server, or simply "a security server" The AAA security functions use a router or access server acting as a network access server (NAS) to establish communication with the security server The NAS does not have to communicate to a separate security server it can use internal securityserver functionality Figure 16-1 is an example of a relationship between an NAS and a separate security server, configured to use AAA
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Figure 16-1: AAA relationship between network access server and security server
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Configuring for AAA
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Before you can use any of the services provided by AAA network security, you need to enable AAA on the NAS by executing the following command:
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Router(config)#aaa new-model If you decide to use a separate security server, you'll need to configure security protocol parameters such as RADIUS and TACACS+ as your chosen method CiscoSecure is NT-supported software that can be used for access control with RADIUS or TACACS+ (There is also a version of CiscoSecure that runs on UNIX) You'll find more information on CiscoSecure, TACACS+, and RADIUS later in this chapter After configuring security protocol parameters, the next step is defining the method lists for authentication and applying those method lists to the required interfaces or to the line of the NAS A method list is simply a list of authentication methods to be used, in sequence, to authenticate a user Designating more than one method ensures that you have a backup in case the initial method does not respond NoteAn authentication ERROR means the security server has failed to respond to an authentication query, and the next authentication method can be used An authentication FAIL means the user has not met the criteria to be authenticated The session is then terminated, and no additional authentication methods are permitted After configuring authentication, you then have the option to configure authorization and accounting
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Authentication
Authentication is the process of verifying that you are who you say you are Authentication requires administrators to identify themselves prior to obtaining access to a network device such as a router The most common and simplest occurrence of authentication is entry and verification of the username and password On a router, local authentication takes a username and password that are configured directly on the router or NAS This data is used during the local (console port), line password (Telnet), and enable (EXEC privilege mode) authentications Cisco has developed both AAA authentication methods and non-AAA authentication methods (see Table 16-1) The AAA authentication methods were designed to be used in conjunction with AAA authorization methods and AAA accounting methods All these methods are explained in the sections coming up Table 16-1: Types of AAA and Non-AAA Authentication Methods
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