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Part 7: Managing Active Directory and Security
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Microsoft Windows Server 2003 Inside Out
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Design Considerations for Active Directory Authentication and Trusts
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Authentication and trusts are integral parts of Active Directory. Before you implement any Active Directory design or try to modify your existing Active Directory infrastructure, you should have a firm understanding of how both authentication and trusts work in an Active Directory environment.
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Universal Groups and Authentication
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When a user logs on to a domain, Active Directory looks up information about the groups of which the user is a member to generate a security token for the user. The security token is needed as part of the normal authentication process and is used whenever a user accesses resources on the network.
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Understanding Security Tokens and Universal Group Membership Caching
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To generate the security token, Active Directory checks the domain local and global group memberships for the user. When a domain is operating in Windows 2000 native functional level or higher, an additional type of group is also available, called a universal group. As universal groups can contain user and group accounts from any domain in the forest, and global catalog servers are the only servers in a domain with forest-wide domain data, the global catalog is essential for logon in any domain operating at the Windows 2000 native functional level or higher. Because of problems authenticating users when global catalog servers are not available, Windows Server 2003 introduces a technique for caching universal group membership. In a domain with domain controllers running Windows Server 2003, universal group membership caching can be enabled. Once caching is enabled, the cache is where domain controllers store universal group membership information that they have previously looked up. Domain controllers use the cache for the next time the user logs on to the domain. The cache is maintained indefinitely and updated periodically to ensure that it is current. By default, domain controllers check the consistency of the cache every eight hours. Thanks to universal group membership caching, remote sites running Windows Server 2003 domain controllers don t necessarily have to have global catalog servers configured as well. This gives you additional options when configuring the Active Directory forest. The assignment of security tokens is only part of the logon process. The logon process also includes authentication and the assignment of a user principal name (UPN) to the user.
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Enabling Universal Group Membership Caching
In a domain with domain controllers running Windows Server 2003, you use the Active Directory Sites And Services tool to configure universal group membership caching. You
Part 7: Managing Active Directory and Security
Designing and Managing the Domain Environment enable caching on a per-site basis. Start Active Directory Sites And Services by clicking Start, Programs or All Programs, Administrative Tools, and Active Directory Sites And Services. Expand the site in which you want to enable universal group membership caching, as shown in the following screen:
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In the right pane, right-click NTDS Site Settings, and then select Properties. This displays the NTDS Site Settings Properties dialog box as shown in the following screen:
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To enable universal group membership caching for the site, select Enable Universal Group Membership Caching and continue as follows:
If the directory has multiple sites, you can replicate existing universal group member-
ship information from a specific site s cache by selecting the site on the Refresh Cache From List. With this option, universal group membership information doesn t need to be generated and then replicated; it is simply replicated from the other site s cache.
If the directory has only one site or you d rather get the information from a global cat-
alog server in the nearest site, accept the default setting <Default>. With this option, universal group membership information is generated and then replicated. When you are finished configuring universal group membership caching, click OK.
Part 7: Managing Active Directory and Security
Microsoft Windows Server 2003 Inside Out
NTLM and Kerberos Authentication
Windows NT 4 uses a form of authentication known as NT LAN Manager (NTLM). With NTLM, an encrypted challenge/response is used to authenticate a user without sending the user s password over the network. The system requesting authentication must perform a calculation that proves it has access to the secured NTLM credentials. It does this by sending a one-way hash of the user s password that can be verified. NTLM authentication has interactive and non-interactive authentication processes. Interactive NTLM authentication over a network typically involves a client system from which a user is requesting authentication, and a domain controller on which the user s password is stored. As the user accesses other resources on the network, non-interactive authentication may take place as well to permit an already logged-on user to access network resources. Typically, noninteractive authentication involves a client, a server, and a domain controller that manages the authentication. To see how NTLM authentication works, consider the situation that occurs when a user tries to access a resource on the network and she is prompted for her user name and password. Assuming the resource is on a server that is not also a domain controller, the authentication process would be similar to the following:
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