User Guide for Cisco Secure Access Control Server - Stewing Home

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About Certification and EAP Protocols 9-8 User Guide for Cisco Secure Access Control Server 4.2 Chapter 9 System Configuration: Authentication and Certificates The session resume feature does not enforce changes to group assignment in an external user database; group mapping does not occur when the session resume feature extends a user session. Instead, the user is mapped to the same ACS group that the user was mapped to at the beginning of the session. At the start of a new session, group mapping enforces the new group assignment. The fast reconnect feature is particularly useful for wireless LANs, wherein a user may move the client computer so that a different wireless access point is in use. When ACS resumes a PEAP session, the user reauthenticates without entering a password, provided that the session has not timed out. If the end-user client is restarted, the user must enter a password; even if the session timeout interval has not ended. You can enable the PEAP fast reconnect feature on the Global Authentication Setup page. For more information about enabling this feature, see Global Authentication Setup, page 9-21. Note Re-use of an established session through fast reconnect will only work when ACS' dynamic users are NOT removed. When dynamic users are explicitly removed, re-use of established sessions is not possible, and ACS will try to do full authentication in the usual manner. PEAP and the Unknown User Policy Enabling PEAP Authentication During PEAP authentication, ACS might not know the real username to be authenticated until phase two of authentication. While the Microsoft PEAP client does reveal the actual username during phase one, the Cisco PEAP client does not; therefore, ACS does not attempt to look up the username that is presented during phase one and the use of the Unknown User Policy is irrelevant during phase one, regardless of the PEAP client used. When phase two of PEAP authentication occurs and the username that the PEAP client presents is unknown to ACS, ACS processes the username in the same way that it processes usernames that are presented in other authentication protocols. If the username is unknown and the Unknown User Policy is disabled, authentication fails. If the username is unknown and the Unknown User Policy is enabled, ACS attempts to authenticate the PEAP user with unknown user processing. For more information about unknown user processing, see About Unknown User Authentication, page 15-3. This procedure provides an overview of the detailed procedures that are required to configure ACS to support PEAP authentication. Note You must configure end-user client computers to support PEAP. This procedure is specific to configuration of ACS only. To enable PEAP authentication: Step 1 Install a server certificate in ACS. PEAP requires a server certificate. For detailed steps, see Installing an ACS Server Certificate, page 9-22. OL-14386-02
Chapter 9 System Configuration: Authentication and Certificates OL-14386-02 About Certification and EAP Protocols Note If you have previously installed a certificate to support EAP-TLS or PEAP user authentication, or to support HTTPS protection of remote ACS administration, you do not need to perform this step. A single server certificate is sufficient to support all certificate-based ACS services and remote administration; however, EAP-TLS and PEAP require that the certificate be suitable for server authentication purposes. Step 2 Enable PEAP on the Global Authentication Setup page. You use ACS to complete this step only after you have successfully completed Step 1. For detailed steps, see Configuring Authentication Options, page 9-21. Step 3 Configure a user database. To determine which user databases support PEAP authentication, see Authentication Protocol-Database Compatibility, page 1-8. ACS is ready to perform PEAP authentication for most users. For more information, see PEAP and the Unknown User Policy, page 9-8. Step 4 Consider enabling the Unknown User Policy to simplify PEAP authentication. For more information, see PEAP and the Unknown User Policy, page 9-8. For detailed steps, see Configuring the Unknown User Policy, page 15-8. EAP-FAST Authentication About EAP-FAST This section contains: About EAP-FAST, page 9-9 About Master Keys, page 9-11 About PACs, page 9-12 Provisioning Modes, page 9-13 Types of PACs, page 9-13 EAP-FAST for Anonymous TLS Renegotiation, page 9-16 PAC Free EAP-FAST, page 9-16 EAP-FAST PKI Authorization Bypass, page 9-16 Master Key and PAC TTLs, page 9-17 Replication and EAP-FAST, page 9-17 Enabling EAP-FAST, page 9-19 The EAP Flexible Authentication via Secured Tunnel (EAP-FAST) protocol is a new, publicly accessible IEEE 802.1X EAP type that Cisco developed to support customers that cannot enforce a strong password policy and want to deploy an 802.1X EAP type that does not require digital certificates. EAP-FAST supports a variety of user and password database types, password change and expiration; and is flexible, easy to deploy, and easy to manage. For more information about EAP-FAST and comparison with other EAP types, see: www.cisco.com/en/US/products/hw/wireless/ps430/products_qanda_item09186a00802030dc.shtml User Guide for Cisco Secure Access Control Server 4.2 9-9
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Preface OL-14386-02 Tip Identifies
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Service Control OL-14386-02 System
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Overview of NAPs OL-14386-02 Networ
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Numerics 3COMUSR settings 2-14 A AA
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See VoIP (Voice-over-IP) VoIP accou
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