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Enforcing Password Policy
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Password policies for domain user accounts and local user accounts are very important in preventing unauthorized access. There are six settings for password policies that enable you to control how passwords are managed. As shown in Figure 37-1, these policies are
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Part 7: Managing Active Directory and Security
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Managing Users, Groups, and Computers located in Computer Configuration\Windows Settings\Security Settings\Account Policies\ Password Policy.
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Figure 37-1.
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Managing Password Policy in the Default Domain Policy.
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The settings are as follows:
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Enforce Password History
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When users change their passwords, this setting determines how many old passwords will be maintained and associated with each user. On a domain controller, the default is 24 passwords, on a stand-alone server, it is zero passwords. This determines when users are required to change their passwords. For example, if this is set to 90 days, on the 91st day the user will be required to change his or her password. The default on domain controllers is 42 days. The minimum number of days is 0, which effectively means that the password never changes. The maximum number of days is 999. In an environment where security is critical, you probably want to set the value low in contrast, for environments where security is less stringent, you could set the password age high (rarely requiring users to change passwords). How long users must use passwords before they are allowed to change the password is determined by this setting. It must be more than zero days for the Enforce Password History Policy to be effective. In an environment where security is critical, you would probably set this to a shorter time, and to a longer time where security not as tight. This setting must be configured to be less than the Maximum Password Age policy. The default is 1 day on a domain controller and 0 days on standalone servers. This is the number of characters that sets the minimum requirement for the length of the password. Again, a more critically secure environment may require longer password lengths than one with reduced security requirements. As shown in Figure 37-2, the default length is seven characters on domain controllers. The default is zero characters on stand-alone servers. 1231
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Maximum Password Age
Minimum Password Age
Minimum Password Length
37
Part 7: Managing Active Directory and Security
Microsoft Windows Server 2003 Inside Out
37
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Figure 37-2. Configuring domain user Minimum Password Length in the Default Domain Policy. Password Must Meet Complexity Requirements
Complexity requirements for passwords for the domain user accounts are set at a higher requirement than previously, in Windows 2000. If this policy is defined, passwords can t contain the user account name, must contain at least six characters, and must consist of uppercase letters, lowercase letters, numerals, and special non-alphabetical characters, such as the percentage sign (%) and the asterisk (*). (Complexity requirements are enabled by default on domain controllers and disabled by default on stand-alone servers for Windows Server 2003.) This is basically an additional policy that allows for plain text encryption of passwords for applications that may need it. By default, it is disabled on Windows Server 2003. Enabling this policy is basically the same as storing passwords as plain text and is used when applications use protocols that need information about the user s password. Because this policy degrades the overall security of the domain, it should be used only when necessary.
Store Passwords Using Reversible Encryption
Configuring Account Lockout Policy
The Account Lockout Policy is invoked after a local user or a domain user has been locked out of his or her account. There are three settings for account lockout policies, located in Computer Configuration\Windows Settings\Security Settings\Account Policies\Account Lockout Policy. They are the following:
Account Lockout Duration
If a user does become locked out, this setting determines how long the user will be locked out before the user account is unlocked. There is no default setting, because this setting is dependent on the account lockout threshold setting. The range is from 0 through 99,999 minutes. The account will be locked out indefinitely when this is set to 0 and therefore will require an administrator to unlock it.
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