Cisco 7604 Configuration Guide - Page 346
Authentication Overview, One-Time Authentication
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Configuring Authentication for Network Access Chapter 17 Applying AAA for Network Access Authentication Overview The FWSM lets you configure network access authentication using AAA servers. This section includes the following topics: • One-Time Authentication, page 17-2 • Applications Required to Receive an Authentication Challenge, page 17-2 • Static PAT and HTTP, page 17-3 • Authenticating Directly with the FWSM, page 17-3 One-Time Authentication A user at a given IP address only needs to authenticate one time for all rules and types, until the authentication session expires. (See the timeout uauth command in the Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Command Reference for timeout values.) For example, if you configure the FWSM to authenticate Telnet and FTP, and a user first successfully authenticates for Telnet, then as long as the authentication session exists, the user does not also have to authenticate for FTP. For HTTP or HTTPS authentication, once authenticated, a user never has to reauthenticate, no matter how low the timeout uauth command is set, because the browser caches the string "Basic=Uuhjksdkfhk==" in every subsequent connection to that particular site. This can be cleared only when the user exits all instances of the web browser and restarts. Flushing the cache is of no use. Applications Required to Receive an Authentication Challenge Although you can configure the FWSM to require authentication for network access to any protocol or service, users can authenticate directly with HTTP, HTTPS, Telnet, or FTP only. A user must first authenticate with one of these services before the FWSM allows other traffic requiring authentication. The authentication ports that the FWSM supports for AAA are fixed: • Port 21 for FTP • Port 23 for Telnet • Port 80 for HTTP • Port 443 for HTTPS FWSM Authentication Prompts For Telnet and FTP, the FWSM generates an authentication prompt. After you authenticate correctly, the FWSM redirects you to your original destination. If the destination server also has its own authentication, you enter another username and password. For HTTP, you log in using basic HTTP authentication supplied by the browser. For HTTPS, the FWSM generates custom login windows. 17-2 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM OL-20748-01
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