LDAP - Enum predefined groups

How can I enumerate members of groups such 'Domain Users', 'Domain Computers', 'Domain Controllers' etc.?
I'm using the LDAP provider and the straightforward way doesn't work. I always get for these groups Members.Count = 0.

Thanks.
NetivAsked:
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Chris DentConnect With a Mentor PowerShell DeveloperCommented:

In short... cheat...

Those groups cannot be enumerated through the LDAP ADS Interface. However... they can be enumerated through the older WinNT ADS Interface. For example (in VbScript):

Set objGroup = GetObject("WinNT://your.domain.local/Domain Users, group")

For Each objUser in objGroup.Members
      WScript.Echo objUser.Name
Next


HTH

Chris
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Chris DentPowerShell DeveloperCommented:

One thing though - Members.Count isn't available as a property of the members collection - you'd have to create an integer variant (say "i"), loop through and count them that way.

Chris
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Chris DentPowerShell DeveloperCommented:

By the way, what are you looking to achieve by enumerating them? There are some very easy ways to get from the NT Username to the AD DS Path if you need to know how.

Chris
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NetivAuthor Commented:
Thank you Chris for your answer.  I'm totally new to the AD programming and your first answer saved me a lot of googling.
I know I can get the members of those groups in other ways (WinNT provider or direct calls like NetLocalGroupEnum), I was just thinking it would be nice to converge into a single method of work. I now understand it is impossible.
As for your last remark, the application need to have a user interface that shows AD groups.

Thank you,
Amir.
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Chris DentPowerShell DeveloperCommented:

Well the way to pull that information via LDAP is to read the Primary Group Token of each Object in AD and compare that with the Primary Group ID of each of the Groups. For instance, the PrimaryGroupID of Domain Users is 513. Each user that is a member of that group will have 513 listed as their Primary Group Token.

Something like this reads the Primary Group ID (again VbScript):

Set objUser = GetObject("LDAP://CN=User Name,OU=Some OU,DC=Your,DC=Domain,DC=local")
intPrimaryGroupID = objUser.Get("primaryGroupID")
If intPrimaryGroupID = 513 Then
     ' Member of Domain Users
End If

Getting the PrimaryGroupToken is also easy:

Set objGroup = GetObject("LDAP://CN=Domain Users,CN=Users,DC=Your,DC=Domain,DC=local")
intPrimaryGroupToken = objGroup.Get("primaryGroupToken")

You can, of course, read in all the Primary Group Tokens and Group Names from AD - but in many cases the only one you're interested in is Domain Users and that is always 513 regardless of who set the domain up.

Always seemed like a really silly way to organise things in my opinion...

Chris
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NetivAuthor Commented:
"...silly way...", You mean that you would use the older interface WinNT  to enumerate this group?
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Chris DentPowerShell DeveloperCommented:

I would use the WinNT interface to read the membership, then the NameTranslate object if I needed to get from those to the ADS Path. Otherwise you're going to have to loop through every user account just to check the membership - and while that may well include everyone it doesn't have to.

I would rather the members of the group could be directly enumerated as with other AD based groups. The Primary Group setup is only there for POSIX / Mac support and generally seems unnecessary.

Chris
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NetivAuthor Commented:
"The Primary Group setup is only there for POSIX / Mac support"
This is exactly what I needed to hear in order to abandon the 'Domain Users' idea.

Thank you,
Amir.
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