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Modifying Active Directory ntSecurityDescriptor property in python-ldap

Posted on 2014-04-26
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Last Modified: 2014-05-15
Just wondering if anyone has any experience modifying the ntSecurityDescriptor property of an Active Directory object from a non-microsoft language (specifically, using python-ldap)?

I am using python-ldap to create user accounts and I need to set the "user cannot change password" property on the new accounts.  Unfortunately, the Microsoft documentation states that you cannot set this property by modifying the userAccountControl attribute directly and must instead pull the DACL object (which is contained within the ntSecurityDescriptor property), and modify a permission setting in there. They have some example code for doing it using a built-in class in Visual Basic, but I'm looking to modify this property directly from python.

Microsoft's documentation on this is here:

http://msdn.microsoft.com/en-us/library/aa746398(v=vs.85).aspx

Would greatly appreciate any assistance on this!
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Question by:rmeany
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Expert Comment

by:David Johnson, CD, MVP
ID: 40024775
It is a lot easier using the winnt provider
http://msdn.microsoft.com/en-us/library/aa746399%28v=vs.85%29.aspx
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Author Comment

by:rmeany
ID: 40024869
Sorry, I should have also mentioned that I am running this python on a linux server, so I have no access to win32 com objects
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Author Comment

by:rmeany
ID: 40024960
Looks like my only option is to edit the nTSecurityDescriptor byte structure directly.  I was having trouble accessing the nTSecurityDescriptor attribute until I found out that it can only be queried using an account with Domain Administrator privileges.. I don't like giving domain admin privileges to a service account, but oh well...

I found documentation describing the structure of nTSecurityDescriptor here:

http://msdn.microsoft.com/en-us/library/cc230366.aspx

I plan to write a function that pulls the DACL bytes, finds within that any ACE entry bytes representing CHANGE_PASSWORD_GUID and sets the ACE entry byte values appropriately (ADS_ACETYPE_ACCESS_DENIED_OBJECT or ADS_ACETYPE_ACCESS_ALLOWED_OBJECT) for any entries with SID bytes that match the SIDs for "Everyone" and "NT Authority\SELF"
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rmeany earned 0 total points
ID: 40056717
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Author Closing Comment

by:rmeany
ID: 40066736
The code I wrote allows you to read and manipulate the security descriptor on AD objects via python-ldap
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