Windows Server 2008 Password Policies

PSO Creation and Configuration Tools
Microsoft doesn’t plan to provide a GUI tool or Microsoft Management Console (MMC) snapin extension to configure fine-grained password policies in the first Server 2008 release. However, you can use existing LDAP query tools such as LDP or LDIFDE, or the MMC ADSI Edit snap-in, to define and configure PSOs. These tools are available on any Server 2008 AD installation. Although these three tools are rather complex, experienced AD administrators should have no problem using them to set the new password policies.

Novice AD administrators, or experienced administrators who simply want to make their jobs easier, might consider Joe Richards’ command- line tool called psomgr.exe, or Special Operations Software’s Specops Password Policy tool. Specops Password Policy lets you use a special MMC snap-in to configure PSOs from the Windows GUI. Both tools hide the AD complexity behind fine-grained password policies and significantly ease their configuration. You can download the PSOMgr tool from www.joeware.net/freetools/tools/psomgr. The fullfeatured commercial version of Specops Password Policy is available at www.specopssoft.com/products/specopspasswordpolicy; a free version with limited functionality, called Specops Password Policy Basic, is available at www.specopssoft.com/wiki/index.php/specopspasswordpolicybasic. The full-featured version extends the standard Windows password policy capabilities by adding features such as the ability to disallow the use of user names or certain words in passwords, and automatic user notification of password expiry via email message.

To use ADSI Edit to define a new PSO, start ADSI Edit and connect to the domain where youwant to define a fine-grained password policy. Then, navigate to the System\Password Policy Settings container. Right-click the container and select New, Object. In the Create Object dialog box, which Figure 1 shows, select the msDSPasswordSettings object class, and enter your preferred password and account lockout policy values for the different PSO attributes.

To use LDP to define a new PSO, you must initiate several LDAP commands from the LDP interface. (For information about using LDP, see the Microsoft article “Using Ldp.exe to Find Data in the Active Directory,” at support.microsoft.com/kb/224543.) To use the LDIFDE command line to define a new PSO, you must first create an LDF configuration file that specifies the different PSO attributes. (For information about using LDIFDE, see the Microsoft article “Using LDIFDE to import and export directory objects to Active Directory,” at support.microsoft.com/kb/237677. For more detailed instructions, see the Microsoft article “Stepby- Step Guide for Fine-Grained Password and Account Lockout Policy Configuration,” at technet2.microsoft.com/windowsserver2008/en/library/2199dcf7-68fd-4315-87cc-ade35f8978ea1033.mspx?mfr=true.)

When you use the ADSI Edit version that’s bundled with Server 2008 to define PSOs, you must enter the four time-related PSO attributes (msDS-MaximumPasswordAge, msDS-MinimumPasswordAge, msDS-LockoutObservationWindow, and msDS-LockoutDuration) in the days:hours:minutes:seconds format. For example, to set a maximum password age of 40 days, you’d enter the value 40:00:00:00. When you use the ldifde command or an older (pre-Server 2008) version of ADSI Edit to create PSOs, you must enter the values of these attributes in I8 format (i.e., integer represented in 8 bytes). In the I8 format, time must be stored in intervals of -100 nanoseconds. This means that to use LDIFDE or an older ADSI Edit version to set PSO attributes to their appropriate values, you must convert the time you want to set in values in minutes, hours, or days to time values in intervals of 100 nanoseconds, then precede the resultant values with a minus sign (-).

Because the I8 format is difficult to use, I recommend that you use the Server 2008 version of the ADSI Edit tool (or the PSOMgr or Specops Password Policy tools) for defining PSOs. The Microsoft article “Step-by-Step Guide for Fine-Grained Password and Account Lockout Policy Configuration” (technet2.microsoft.com/windowsserver2008/en/library/2199dcf7-68fd-4315-87cc-ade35f8978ea1033.mspx?mfr=true) explains I8 conversion in more detail.

In addition to using ADSI Edit, LDP, LDIFDE, PSOMgr, or Specops Password Policy to link PSOs to users or global groups, you can also use the MMC Active Directory Users and Computers snap-in. To link a PSO to a user or group from this snap-in, open the snapin and ensure that the Advanced Features view is enabled. (To enable this view, use the Advanced Features option in the View menu.) Then, open the Passwords Settings Container in the System container, right-click the PSO you want to link, and select Properties. In the Properties dialog box, select the Attribute Editor tab, select the msDS-PSOAppliesTo attribute, and click Edit. Finally, in the Edit dialog box, which Figure 2 shows, enter the DN of the user or group you want to link the PSO to. If you don’t know the correct DN of a user or group, you can obtain it from the Active Directory Users and Computers snap-in. In the snap-in’s details pane, right-click the user or the global security group, select Properties, select the Attribute Editor tab, and view the value of the user’s or group’s distinguishedName attribute in the Attributes list.

A Valuable Addition
Server 2008’s fine-grained password and account lockout policies are a valuable addition to the Windows security management portfolio. Although defining and configuring these policies isn’t straightforward in the first Server 2008 release (I strongly advise you to use PSOMgr or the Specops Password Policy tool), the policies do provide a significant level of additional flexibility. For example, Server 2008’s fine-grained password policies eliminate the need for organizations to define additional Windows domains or develop special password filters.

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