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Shadow Groups

DS-Tools

The Quick and Dirty version:
dsquery user “<Organizational Unit distinguishedName>” –scope onelevel | dsmod group “<Shadow Group distinguishedName>” –chmbr

This will look for all users found in the specified OU, and limit the search to that OU only. Then it will clear the current group membership of the SG and add all users currently found in the OU.

The Clean and Clever batch file version:
Set OU=Organizational Unit distinguishedName (without quotes)
Set Group=Shadow Group distinguishedName (without quotes)

dsget group %Group% –members | find /v /i “%OU%” | dsmod group “%Group%” –rmmbr
dsquery * “%OU%” –filter “(&(sAMAccountType=805306368)(!memberOf=%Group%))” –scope onelevel | dsmod “%Group%” –addmbr


This will look at the group membership, pipe it to the find command, to find only the users where the OU’s distinguishedName is NOT present, and then pipe it to dsmod group to remove those users from the group. The next step is to look for all users in the specified OU that are NOT member of the Shadow Group already. It will then add any users found to the group.

PowerShell

Windows Server 2008 R2 with Active Directory cmdlets:
$OU=”Organizational Unit distinguishedName”
$Group=”Shadow Group distinguishedName”

Get-ADGroupMember –Identity $Group | Where-Object {$_.distinguishedName –NotMatch $OU} | ForEach-Object {Remove-ADPrincipalGroupMembership –Identity $_ –MemberOf $Group –Confirm:$false}
Get-ADUser –SearchBase $OU –SearchScope OneLevel –LDAPFilter “(!memberOf=$Group)” | ForEach-Object {Add-ADPrincipalGroupMembership –Identity $_ –MemberOf $Group}
 

This will do the same thing as the ds-tools clean and clever version, except it’s done in PowerShell with the AD cmdlets.

Once you’ve decided for what approach you want to take, you can easily create a scheduled task for this and ensure that the batch or PowerShell script runs at intervals that suits your organization. Just make sure that the user account the scheduled task runs under has got the proper privileges (such as log on as batch job and permission to update the Shadow Groups (write members) in Active Directory).