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PRB: Windows NT Permissions for Distribution List when Owner Set ADSI/LDAP

ID: Q242039

The information in this article applies to:

Microsoft Exchange Server, version 5.5
Microsoft Active Directory Service Interfaces, versions 1.0, 2.0, 2.5

SYMPTOMS

The owner of a distribution list is set through a Lightweight Directory Access Protocol (LDAP) and the new owner is unable to modify the membership of the list.

CAUSE

When the owner for a distribution list (DL) is set, the Microsoft Exchange Administrator program (Admin.exe) retrieves the associated Windows NT account of the owning object, usually a mailbox. This Windows NT account is then given user permissions on the distribution list. This allows the owner of the mailbox to add and remove members of the distribution list.

If the owner of the distribution list is set through ADSI/LDAP, the owner is not automatically retrieved and permissions for the associated Windows NT account are not set. This prevents the new owner from altering the list's membership.

NOTE: Improper permissions can also occur by changing the associated Windows NT account of the mailbox set as the owner. For further information see the following Knowledge Base article:

Q177838 XADM: NT Security Descriptor Associated w/ DL Owner Not Updated

RESOLUTION

In order to allow the distribution list owner to be able to add and remove members, the permissions must be properly set. This can be done by either making a change through Microsoft Exchange Administrator program (see the Knowledge Base Article Q177838) or by explicitly setting the security descriptor via LDAP.

Normally, when an owner is set on a distribution list, the only permissions which are added are for the associated Windows NT account. Setting a user to a distribution list requires LDAP to read the security descriptor of the distribution list, removing the Discretionary Access Control List (DACL), adding an Access Control Entry (ACE) with a trustee for that Windows NT account, replacing the DACL, then writing the security descriptor back to the directory.

MORE INFORMATION

For simplicity, the following ADSI code example copies the entire security descriptor from the owner's mailbox and places it on the distribution list. This will have the effect of giving all the users who have permission on that mailbox the same permissions on the distribution list.


strDNofDL = "cn=MyDL,cn=Recipients,ou=MySite,o=MyOrg"
strDNofMailbox = "cn=MyMailbox,cn=Recipients,ou=MySite,o=MyOrg"
strServer = "MyExchangeServerName"
set oDL = GetObject("LDAP://" + strServer + "/" + strDNofDL )
oDL.put "owner", strDNofMailbox
set oMailbox  = GetObject("LDAP://" + strServer + "/" + strDNofMailbox)
oMailbox.GetInfoEx Array("NT-Security-Descriptor"), 0
oDL.Put "NT-Security-Descriptor", oMailbox.Get("NT-Security-Descriptor")
oDL.SetInfo

REFERENCES

For additional information about this particular problem, please see the following article in the Microsoft Knowledge Base:

Q177838 XADM: NT Security Descriptor Associated w/ DL Owner Not Updated

For general information on Active Directory Services Interfaces(ADSI) please view the following Web site:

http://www.microsoft.com/adsi

For information about working with Exchange Mailboxes and Distribution Lists from ADSI, please see the following article in the Microsoft Knowledge Base:

Q220043 HOWTO: Find Distribution List Membership for a Given Recipient

Additional query words:

Keywords : kbADSI kbXchge kbXchge550 kbMsg kbVBp kbGrpPlatform kbGrpMsg kbDSupport
Version : winnt:1.0,2.0,2.5,5.5
Platform : winnt
Issue type : kbprb