[Samba] Winbind nested groups not working

Joshua Penix jpenix at binarytribe.com
Fri Jan 19 03:10:26 GMT 2007

On Jan 18, 2007, at 6:54 AM, Gerald (Jerry) Carter wrote:

> The nest group functionality is for a local BUILTIN\Administrators
> or MACHINE\localgrp type of group.  The patch in question I was
> referring to was to expand local group membership in getgrnam().
> These are different things.  Not sure which one you are looking for
> if either.

Hrm, then I'm not quite sure either.  Here's the goal --

Samba is acting as a member file server in an AD domain.  In addition  
to the domain containing Samba, there are two other domains in the AD  
forest.  All three domains have full trust between them.  Each domain  
has a Global Security Group called ACAD_ENGR.  Samba sees them as DOM1 
+ACAD_ENGR, DOM2+ACAD_ENGR, and DOM3+ACAD_ENGR.  I'd like members  
from all three groups to have write access to a particular  
directory.  This needs to be done with filesystem permissions, not  
share permissions, because underneath each directory there are  
further subdirectories that have varying access rights matched to  
other groups in the three domains.

Thoughts?  Is this possible with Samba?

Under Windows there would be two ways to achieve it:

1) Assign all three ACAD_ENGR groups rights to each folder.  In  
theory, this could be achieved in Linux by using ACLs.  But it is not  
an easily manageable solution - should we add a fourth domain, we  
would have to go back and add it to every folder.

2) In the domain where the files are actually hosted, create a Domain  
Local group and then add the ACAD_ENGR groups from each domain to  
it.  Then assign rights on the filesystem to the single Domain Local  
group.  This is considered the "best practice" - down the road,  
adding or removing access is as simple as a group membership change.

Number 2 is what I'm trying to do, but Samba doesn't seem to allow  
it.  I cannot see the Domain Local group through "wbinfo -g".  I  
*can* explicitly pull its ID with "getent group DOM1+localgroup", but  
it shows as having no members.  Since getent sees it, I can assign it  
as group owner of a directory, but Samba will not let any of the  
members have access.

Am I just doing something wrong?

Joshua Penix                                http://www.binarytribe.com
Binary Tribe           Linux Integration Services & Network Consulting

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