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Configuring basic authentication delegation
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How to Implement RADIUS Server for Authentication
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ISA Server enables the use of RADIUS to authenticate users. RADIUS is an industrystandard protocol used to provide authentication in heterogeneous environments. To implement RADIUS authentication, you need to implement the following components:
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RADIUS server A RADIUS server has access to all the user accounts within a defined namespace. The RADIUS server passes authentication requests to an authentication server (such as an Active Directory domain controller) and can also be used to apply policies to user connections. Microsoft includes Internet Authentication Server (IAS), which is a RADIUS server with Windows 2000 Server and Windows Server 2003. RADIUS client A RADIUS client is typically a dial-up server, VPN server, or wireless access point. The RADIUS client is the server that users connect to when they want to access a network. The RADIUS client collects the user credentials and sends them in the form of a RADIUS message to a RADIUS server. The RADIUS server authenticates the RADIUS client request, and sends back a RADIUS message response. If the RADIUS message response indicates that the user has been successfully authenticated, the user is granted access.
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ISA Server can be configured as a RADIUS client. This means that when users connect to ISA Server, ISA Server will send the user logon information to a RADIUS server rather than to an Active Directory domain controller. The most important benefit of using RADIUS for ISA Server authentication is that you can authenticate users based on their Active Directory user names without requiring that ISA Server be a member of the Active Directory domain. In organizations that have deployed Active Directory, most user accounts are stored in Active Directory. One of the benefits of using ISA Server as a firewall is that you can use those Active Directory accounts to authenticate user access, for both inbound and outbound access. However, for ISA Server to authenticate Active Directory users, the computer running ISA Server must be a member of the Active Directory domain. Security best practices specify that the firewall should not be located on a server that is a member of a Windows domain. The problem with using a firewall that is a member of a domain is that if an attacker were able to compromise the firewall, the attacker could potentially leverage the firewall s domain member status to launch a successful attack against other internal network servers. You can use RADIUS to gain the benefit of using the Active Directory domains for authentication without joining the server running ISA Server to the domain. When ISA Server is configured to use RADIUS authentication for incoming Web requests, the firewall forwards the request to a RADIUS server located on a protected network. The RADIUS server can forward the authentication requests to an Active Directory domain controller, another RADIUS server, or a directory server created by a third party that accepts RADIUS authentication messages.
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Implementing ISA Server Publishing
How to Implement RADIUS Authentication
Configuring ISA Server to use RADIUS for authentication requires several steps. The high-level steps are described here (you will complete the detailed steps in the following practice): 1. Install IAS on a computer running Windows Server 2003 or Windows 2000 Server. IAS is one of the Networking Services installed by using Add Or Remove Programs from Control Panel. 2. Configure IAS to accept ISA Server as a RADIUS client. To configure this option, open the Internet Authentication Service console from the Administrative Tools menu. Right-click RADIUS clients and click New RADIUS client. To complete the configuration, you need to provide the ISA Server name and IP address and configure a shared secret that will be used to authenticate the connection between the ISA Server and the RADIUS server. 3. Configure IAS to use Active Directory for its user account database. To do this, you must register the IAS server in the Active Directory domain. 4. Configure the Active Directory user accounts and remote access policies. When the user attempts to authenticate on a RADIUS server, the RADIUS server checks the user account properties and the remote access policies to determine if the user can authenticate. The user account must be configured to allow dial-in access or configured so that dial-in access is controlled by a remote access policy. Then a remote access policy must be created that will allow the user dial-in access. 5. Configure ISA Server to use a RADIUS server for authentication. To do this, expand the Configuration container in ISA Server management, click General and then click Define RADIUS Servers. To add a RADIUS server, click Add and then specify the RADIUS server name, shared secret, and port number, as shown in Figure 8-23.
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