DESIGNING AND INSTALLING ACTIVE DIRECTORY in VS .NET

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11 DESIGNING AND INSTALLING ACTIVE DIRECTORY
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FIGURE 11-32 For the rst time, you can promote without being a domain administrator
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FIGURE 11-33 An unoccupied account is found
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Designing and Installing Active Directory
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The rest of the wizard runs as usual, allowing you to select the log location and so on Once again, you can export the con guration to a le for unattended installation, as in the following example When you run the unattended installation, remember the /UseExistingAccount: Attach switch
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; DCPROMO unattend le (automatically generated by dcpromo) ; Usage: ; dcpromoexe /UseExistingAccount:Attach ; /unattend:C:\temp\rodcviaprestagedtxt ; ; You may need to ll in password elds prior to using ; the unattend le ; If you leave the values for Password and/or ; DNSDelegationPassword ; as * , then you will be asked for credentials at runtime ; [DCInstall] ; Read-Only Replica DC promotion (stage 2) ReplicaDomainDNSName=virtsavilltechnet UserDomain=virtsavilltechnet UserName=dutch@virtsavilltechnet Password=* DatabasePath= C:\Windows\NTDS LogPath= C:\Windows\NTDS SYSVOLPath= C:\Windows\SYSVOL ; Set SafeModeAdminPassword to the correct value prior ; to using the unattend le SafeModeAdminPassword=Pa55word ; Run-time ags (optional) ; CriticalReplicationOnly=Yes ; RebootOnCompletion=Yes
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Once the RODC is rebooted, you can manage it as you would any other server, via the local administrators who were delegated permissions They just won t be able to affect the directory service The only special maintenance you, as domain administrators, may want to possibly perform on the RODC is to modify who is delegated to manage the server and to modify the Password Replication Policy Access these con guration items by selecting the properties of the RODC in the Active Directory Users and Computers MMC snap-in The Managed By tab shows who can manage the server Again, use a group, and just add/remove people in the group without having to modify the RODC con guration On the Password
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Read-Only Domain Controllers (RODCs)
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Replication Policy tab, as shown in Figure 11-34, make changes to the accounts that have passwords cached via the Add button, which then enables you to specify whether you are adding a Deny or Allow entry
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11 DESIGNING AND INSTALLING ACTIVE DIRECTORY
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FIGURE 11-34 The Austin Local Users group added to cache accounts Click the Advanced button to display a dialog listing all the accounts that have passwords cached on the server, as shown in Figure 11-35 If you are unsure whether a user s password is cached, check the Resultant Policy tab
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FIGURE 11-35 The Kerberos ticket for the RODC and its computer account are cached
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Here the user Dutch is also cached, as he is a member of the Austin Local Users group and has an explicit Allow in the Password Replication Policy
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So is it really working Download Proactive Password Auditor and run it on the RODC to get a result similar to that shown in Figure 11-36 The passwords for the domain users are all empty except for those that are set to Allow in the Password Replication Policy
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FIGURE 11-36 If this RODC is compromised, only the accounts that are cached are
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exposed; all the rest don t have the passwords stored on the RODC
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One other cool feature is that if you delete the computer object for an RODC, a special dialog appears, allowing you to reset passwords for the accounts that had their passwords stored on the RODC
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Trust Relationships
Directory Services of today is different from Directory Services of Windows NT 40, when a lot of manual trust relationships had to be created between the various domains in an organization, sometimes leading to a complex and difficult-to-maintain set of relationships Within an AD forest, a number of automatically created trust relationships are
Trust Relationships
maintained that enable resources to be shared between any domains in the forest You never create a trust relationship that you know of; the Active Directory Domain Services Installation Wizard does it for you
Trust Relationship 101
If you have more than one domain, it is highly likely that you want to be able to securely grant users/computers/groups from one domain access to resources in another domain For example, user Bob in domain development needs access to a set of les in the marketing domain By default, the Access Control List of an object cannot have entries for accounts in other domains; they won t be visible To resolve this, create a trust between the two domains The domain that holds the resources has to trust that the domain containing the user accounts requiring access performs proper authorization You are trusting that the domain is secured and is not going to expose your resources This logical view of a trust is how it is technically implemented: A trust relationship is created where one domain would trust the other domain The domain holding the resources would be the trusting domain (it trusts the domain with the accounts), and the domain holding the accounts would be the trusted domain (see Figure 11-37)