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ISA Server Web Publishing Authentication Scenarios
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When designing an authentication strategy for ISA Server Web publishing rules, you have several options. You can configure ISA Server to perform the authentication, or you can configure the published server to perform the authentication. In some cases, you may want to require authentication on both ISA Server and the published server.
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Configure Authentication on ISA Server
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In some cases, you may want users to authenticate before they reach the internal network. To enable this, you can configure the Web listener associated with the publishing rule to require authentication. Once the users authenticate with ISA Server, they can then access the Web server on the internal network. This is a secure configuration because if users cannot successfully authenticate with ISA Server, they cannot access anything on the internal network. Use ISA Server authentication if you have fairly simple authentication requirements. For example, if you want to ensure that only authenticated users can access all your published Web servers, then configure the Web listener to allow access to the All Authenticated Users user set. This option also has the added benefit of offloading authentication activity to the ISA Server computer.
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Configuring ISA Server Authentication
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See Also For information about how to configure authentication, see 5, Enabling Secure Internet Access with ISA Server 2004. Although 5 deals specifically with how to configure authentication for outbound Internet access, the options and procedures for configuring authentication are the same when configuring authentication for inbound access. The only differences are that you need to configure the authentication protocols on the Web listener rather than on the Internal network properties, and you can configure OWA Forms-Based authentication and SecurID authentication on the Web listener. OWA Forms-Based authentication will be discussed in detail in 9.
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Configure Authentication on the Internal Web Server
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Another option for configuring authentication is to configure the internal Web server to require authentication. In this scenario, ISA Server allows anonymous access to the published server, but the server requests authentication. In this configuration, ISA Server uses pass-through authentication to complete the authentication. Pass-through authentication refers to the ability of ISA Server to pass a client s authentication information to the destination server. The following steps describe how pass-through authentication works in a Web publishing scenario: 1. The client sends a request for an object on a Web server protected by ISA Server. Because the publishing rule allows anonymous access, ISA Server does not prompt for authentication but passes the request to the Web server. 2. The Web server receives the request and responds that authentication is required. 3. ISA Server passes the authentication-required response to the client. 4. The client returns authentication information to ISA Server. 5. ISA Server passes the client authentication information to the Web server. 6. After successful authentication, the client communicates with the Web server. This option transfers all authentication activity to the internal server. This is a recommended solution when you have complex authentication requirements. For example, you may be publishing multiple Web sites with some allowing anonymous access, while others require authentication. In this scenario, it is easier to configure authentication on the internal Web server.
Important If you are publishing resources using a server publishing rule, you can only configure authentication on the server hosting the internal resource. You cannot configure authentication on a server publishing rule.
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8
Implementing ISA Server Publishing
Configure Authentication on ISA Server and on the Internal Web Server
You can also design an authentication strategy that requires that users authenticate on ISA Server as well as on the internal Web server. You may choose to implement this solution if you have a Web site with varying types of confidential information. For example, you may want to limit access to a private Web site in your organization to only users who have valid domain user accounts. However, the Web site may also contain a confidential area that should be accessible only to executives. In this case, you could enable ISA Server authentication to limit access to the Web site to the Domain Users group, and then use authentication on the Web server to limit access to confidential information. When you configure authentication using an authentication option other than basic authentication on both servers, the users have to provide their credentials more than once. If you are using basic authentication on both ISA Server and the internal Web server, you can use basic authentication delegation to enable single sign-on for the users. When you enable basic authentication delegation, ISA Server authenticates the users, and then forwards the user credentials to the Web server, allowing the Web server to authenticate users without requesting credentials a second time. To enable basic authentication delegation, select the check box for Forward Basic Authentication Credentials (Basic Delegation) on the Users tab of the Web publishing or secure Web publishing rule, as shown in Figure 8-22.
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