User Guide for Cisco Secure Access Control Server - Stewing Home

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Windows User Database 12-14 User Guide for Cisco Secure Access Control Server 4.2 Chapter 12 User Databases 2. Ensure that the certification authority (CA) certificate of the CA that issued the ACS server certificate is stored in machine storage on client computers. User storage is not available during machine authentication; therefore, if the CA certificate is in user storage, machine authentication fails. 3. Select the wireless network: – In Windows XP, you can choose Windows Network Connection > Properties > Network Connection Properties. – In Windows 2000, you can manually enter the Service Set Identifier (SSID) of the wireless network. Use the Advanced tab of the properties dialog box for the wireless network adapter. 4. To enable PEAP machine authentication, configure the Authentication tab. In Windows XP, the Authentication tab is available from the properties of the wireless network. In Windows 2000, it is available from the properties of the wireless network connection. To configure the Authentication tab: a. Check the Enable network access control using IEEE 802.1X check box. b. Check the Authenticate as computer when computer information is available check box. c. From the EAP type list, select Protected EAP (PEAP). d. On the Protected EAP Properties dialog box, you can enforce that ACS has a valid server certificate by checking the Validate server certificate check box. If you do check this check box, you must also select the applicable Trusted Root Certification Authorities. e. Also open the PEAP properties dialog box, from the Select Authentication Method list, select Secured password (EAP-MS-CHAP v2). 5. To enable EAP-TLS machine authentication, configure the Authentication tab. In Windows XP, the Authentication tab is available from the properties of the wireless network. In Windows 2000, it is available from the properties of the wireless network connection. a. Check the Enable network access control using IEEE 802.1X check box. b. Check the Authenticate as computer when computer information is available check box. c. From the EAP type list, select Smart Card or other Certificate. d. On the Smart Card or other Certificate Properties dialog box, select the Use a certificate on this computer option. e. Also on the Smart Card or other Certificate Properties dialog box, you can enforce that ACS has a valid server certificate by checking the Validate server certificate check box. If you check this check box, you must also select the applicable Trusted Root Certification Authorities. If you have a Microsoft certification authority server that is configured on the domain controller, you can configure a policy in Active Directory to produce a client certificate automatically when a computer is added to the domain. For more information, see the Microsoft Knowledge Base Article 313407, HOW TO: Create Automatic Certificate Requests with Group Policy in Windows. OL-14386-02
Chapter 12 User Databases Enabling Machine Authentication OL-14386-02 Windows User Database This procedure contains an overview of the detailed procedures required to configure ACS to support machine authentication. Note You must configure end-user client computers and the applicable Active Directory to support machine authentication. This procedure is specific to configuration of ACS only. For information about configuring Microsoft Windows operating systems to support machine authentication, see Microsoft Windows and Machine Authentication, page 12-13. Note Solution Engine only: Windows authentication requires that you install at least one ACS Remote Agent for Windows and complete the steps in Adding a Remote Agent, page 3-21. For information about installing the ACS Remote Agent for Windows, see the Installation and Configuration Guide for Cisco Secure ACS Remote Agents Release 4.2. To enable ACS to perform machine authentication: Step 1 Install a server certificate in ACS. PEAP (EAP-MS-CHAPv2) and EAP-TLS require a server certificate. ACS uses a single certificate to support both protocols. For detailed steps, see Installing an ACS Server Certificate, page 9-22. Note If you have 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 will support all certificate-based ACS services and remote administration. Step 2 For EAP-TLS machine authentication, if certificates on end-user clients are issued by a different CA than the CA that issued the server certificate on ACS, you must edit the certification trust list so that CAs that issue end-user client certificates are trusted. If you do not perform this step and the CA of the server certificate is not the same as the CA of an end-user client certificate CA, EAP-TLS will operate normally; but reject the EAP-TLS machine authentication because it does not trust the correct CA. For detailed steps, see Editing the Certificate Trust List, page 9-28. Step 3 Enable the applicable protocols on the Global Authentication Setup page: To support machine authentication with PEAP, enable the PEAP (EAP-MS-CHAPv2) protocol. To support machine authentication with EAP-TLS, enable the EAP-TLS protocol. Note Solution Engine only: If you are using a Network Access Profile (NAP), the same protocols must be enabled in the NAP configuration. You can 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 4 Configure a Windows external user database and enable the applicable types of machine authentication on the Windows User Database Configuration page: To support machine authentication with PEAP, check the Enable PEAP machine authentication check box. User Guide for Cisco Secure Access Control Server 4.2 12-15
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