[Samba] smbpasswd backend, group-per-user, and primary gid not a domain group

[Craig White]

On Mon, 2004-07-19 at 17:09, Frank H wrote: 
> After changing from 2.x to 3.0 I get these messages:
> 
> rpc_server/srv_util.c:get_domain_user_groups(376)
> get_domain_user_groups: primary gid of user [fred] is not a Domain group !
> get_domain_user_groups: You should fix it, NT doesn't like that
> 
> I understand why this is: fred's group needs to be mapped like so
> 
> net groupmap modify ntgroup="Domain Users" unixgroup=<fred's group>
> 
> The problem is this: each user is in a different group (i.e. fred's
> initial group, the one mentioned in /etc/passed, is fred) and I can only
> map one onto "Domain Users."
> I don't want to give up my "group-per-user, umask is always 2" system.
> I'm hoping to avoid a more complicated password backend, assuming that
> would even help.
> 
> My best idea so far is to set everyone's initial group (the one in
> /etc/passwd) to "user" mapped to "Domain Users" and also add them
> to their personal group.  Then home directories have to be setgid so
> files don't end up in group "user."  But it's too easy to lose
> setgid bits.  "mkdir /tmp/dir; mv /tmp/dir ~" and files made
> in ~/dir are now the wrong group.
> 
> My questions are:
> 
> Is there a clean solution using the smbpasswd file password backend
> and keeping the group-per-user plan?
> 
> If I bite the bullet and go to ldapsam or tdbsam does that help?
> 
> Do I even need to worry about this?  "NT doesn't like that" sounds
> ominous, but everything seems to work.  My clients are mainly W2K
> if that matters.
----
you are the chief - you make the call

according to samba 3 How-to
<http://us1.samba.org/samba/docs/man/Samba-HOWTO-Collection/passdb.html>
smbpasswd

This option allows continued use of the smbpasswd file that maintains a
plain ASCII (text) layout that includes the MS Windows LanMan and NT
encrypted passwords as well as a field that stores some account
information. This form of password backend does not store any of the MS
Windows NT/200x SAM (Security Account Manager) information required to
provide the extended controls that are needed for more comprehensive
inter-operation with MS Windows NT4/200x servers. 

This backend should be used only for backward compatibility with older
versions of Samba. It may be deprecated in future releases. 

tdbsam

This backend provides a rich database backend for local servers. This
backend is not suitable for multiple Domain Controllers (i.e., PDC + one
or more BDC) installations. 

The tdbsam password backend stores the old  smbpasswd information plus
the extended MS Windows NT / 200x SAM information into a binary format
TDB (trivial database) file. The inclusion of the extended information
makes it possible for Samba-3 to implement the same account and system
access controls that are possible with MS Windows NT4/200x-based
systems. 

The inclusion of the tdbsam capability is a direct response to user
requests to allow simple site operation without the overhead of the
complexities of running OpenLDAP. It is recommended to use this only for
sites that have fewer than 250 users. For larger sites or
implementations, the use of OpenLDAP or of Active Directory integration
is strongly recommended. 

I would change to tdb but that's me.

Craig