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Figure 8-23 Configuring ISA Server to use a RADIUS server for authentication
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Configuring ISA Server Authentication
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6. Configure a Web listener to use RADIUS authentication. To do this, perform the following steps: a. Access the Web Listener properties on the Firewall Policy Toolbox tab. b. On the Web Listener Properties dialog box, select the Preferences tab and click Authentication, as shown in Figure 8-24.
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Configuring a Web listener to use a RADIUS server for authentication
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c. Select RADIUS authentication and then click RADIUS Servers to select the RADIUS server that will be used by the Web listener.
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Off the Record
Although RADIUS authentication does enable you to configure authentication based on domain groups without joining the ISA Server computer to the Active Directory domain, the current implementation of RADIUS authentication on ISA Server is too limited to be feasible in a complex environment. When you configure the RADIUS remote access policy, you can choose to which group the policy will apply. You can also configure whether the group has permission to connect or not. However, you can apply only one remote access policy for ISA Server authentication. For example, if you create a remote access policy that allows members of the Managers group to access the server, and then configure the Web Listener to use RADIUS, only members of the Members of the Managers group will be able to access the Web site. That may be what you want but once you configure this rule, you cannot enable RADIUS authentication for another Web publishing rule and provide access to another group of users. You can configure a user set on the ISA Server computer, but there is no way for ISA Server to pass the user set information to the RADIUS server. Because of this limitation, RADIUS cannot be used to configure complex authentication requirements on ISA Server. About the best you can do is configure RADIUS to grant access to the Domain Users group, and then use more granular permissions on the Web site.
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Implementing ISA Server Publishing
How to Implement SecurID for Authentication
The RSA SecurID authentication system is a two-factor user authentication system. Two-factor authentication means that users need to identify themselves with two unique factors: something they know (a password or PIN) and something they have (in this case, an RSA SecurID token that generates a unique six-digit passcode every minute). ISA Server 2004 enables the option to authenticate users based on authentication credentials from the RSA SecurID product from RSA Security, Inc. To implement RSA SecurID authentication, you need the following components:
RSA ACE/Server This computer retains information about users, groups, hosts, and tokens. For each user, the RSA ACE/Server maintains a list of hosts to which the user can log on, and a logon name, which can differ from one host to the other. RSA ACE/Agent This computer provides Web content, and requires the user to provide credentials for RSA SecurID. When using SecurID authentication with ISA Server, ISA Server is the RSA ACE/Client. Client Usually, this is a Web browser that receives Web content.
When a user attempts to access Web pages that are protected by RSA SecurID, the ISA Server computer requests a Web browser cookie. This cookie will only be present if the user has authenticated recently. If the user s cookie is missing, the user is prompted for a username and passcode for SecurID. The passcode consists of a combination of the user s PIN and tokencode. The tokencode is displayed on the user s token and changes once every minute. The RSA ACE/Agent on the ISA Server computer passes these credentials to the RSA ACE/Server computer for validation. If the credentials are successfully validated, a cookie is delivered to the user s browser for subsequent activity during the session, and the user is granted access to the content. Configuring ISA Server to use RSA SecurID is similar to configuring ISA Server to use a RADIUS server for authentication. The high-level steps are described here (to complete the detailed steps, you need access to an RSA ACE/Server): 1. On the RSA ACE/Server, set up ISA Server as an RSA ACE/Agent. To do this, you need to add the ISA Server computer name and IP address as an Agent Host. Then copy the Sdconf.rec file, located in the ACE\Data folder on the RSA ACE/Server computer, to the %Windir%\System32 folder on the ISA Server computer. ISA Server uses this file when connecting to the RSA ACE/Server. 2. Add users to the ISA Server Host record on the ACE Server computer. Users with valid authentication credentials must be specified on the ACE Server computer. 3. Configure a Web listener to use SecurID for authentication.
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