[Samba] winbind auth using ADS with domain trusts

SAMBA letz_samba at realmspace.com
Sun Dec 4 08:20:34 GMT 2005

I would be interested in contributing, but I have oh so many questions,
once I understand, I will document what I know.  For myself, I am
totally not interested in ANY NT style domain functionality, but rather
full 100% pure Active Directory integration.  I am now exploring PADL
stuff and Kerberos stuff along with either AD4Unix or SFU3.5.  However,
I am concerned over PADL's lack of caching and I'm interested in

I'm also interested in automation of UID/GID generation perhaps with
IDMAP.  I would want them written back to AD LDAP, rather than a
separate database. I don't know if it does this already.

I would also be interested in developing my own scheme to how UID/GID
are generated in correlation to SID, so I might avoid IDMAP (or change
it, mumuhuhuhaha).

 - Joaquin Menchaca

-----Original Message-----
From: samba-bounces+letz_samba=realmspace.com at lists.samba.org
[mailto:samba-bounces+letz_samba=realmspace.com at lists.samba.org] On
Behalf Of John H Terpstra
Sent: Wednesday, November 23, 2005 2:25 PM
To: Shaun Kruger
Cc: samba at samba.org
Subject: Re: [Samba] winbind auth using ADS with domain trusts

On Wednesday 23 November 2005 14:34, you wrote:
> On 11/23/05, John H Terpstra <jht at samba.org> wrote:
> > On Wednesday 23 November 2005 14:03, Shaun Kruger wrote:
> > > In reading the documentation I havn't found anything that covers
> > > use of winbindd when authenticating against one domain (lets call
> > > 'A') while also allowing users from a domain trusted by A (lets
call it
> > > 'B').
> >
> > What documentation have you read so far?
> I've been spending alot of time with the Samba howto collection
> http://us4.samba.org/samba/docs/man/Samba-HOWTO-Collection/
> I've been reading about domain membership and winbindd

OK. So perhaps are you delving head-first into the mechanic's guide
before you 
have mastered deployment? The book, "Samba-3 by Example" is designed to
people to deploy Samba-3 BEFORE they start to tinker with its arkane 
features. (see http://www.samba.org/samba/docs/Samba3-ByExample.pdf)

Having a working system before tinkering makes it easier to observe the 
effects of change, and thus aides and accelerates learning.

Chapter 7 of the ByExample book provides information on adding Samba
that are domain members. Mastery of domain member servers will help you
interdomain trust handling.

In any case, the Samba3-HOWTO (aka Samba3-HOWTO-Collection)
(see http://www.samba.org/samba/docs/Samba3-HOWTO.pdf) has a few
chapters you 
will need to refer to:

	Chapter 18 describes how interdomain trusts can be established
			- create interdomain trusts so that users from
one domain
			can access resources in a foreign domain.

	Chapter 11 describes group management concepts.

	Chapter 12 describes the use of the 'net' command
			- you will need to establish nested groups that
will be used
			to permit users from trusted domains to access
			that are used in the trusting domain. If you do
not do this, 
			foreign domain users and groups will operate
			independent UID/GID date thus necessitating
relaxation of 
			UNIX file system permissions so that local and
foreign users
			can access the same resources.

	Chapter 13 describes IDMAP functionality
			- your foreign user and group SIDs must be
translated to
			locally known UID/GID values - that is the role
of winbind.
			However it can also be done without winbind -
in that case 
			the accounts must be capable of being resolved
locally on 
			the Samba server.

	Chapter 14 describes user rights and privileges
			- remote administration of a foreign domain is
			only through use of these facilities that were
new to
			Samba 3.0.11.

Above all, you need to understand how in a pure Windows NT/200x world 
interdomain trusts are used. My documentation does not try to impart

I am the first to admit that the HOWTO does not provide a neatly
guide to setting up a domain member server, nor does it provide a
document to describe use of interdomain file and directory access. I'd
appreciate it if someone would contribute a well documented chapter on

Despite all this, I strongly believe that the domain controller, backup
controller and domain membership chapters in the HOWTO are in need of 
restructuring. I am working on the next generation documentation that
ulitmately replace these chapters - I just do not know when this will be

implemented due to other priorities.

I believe that the "Samba-3 by Example" is the best place for deployment

guidance and that the HOWTO should stick to explanation of how Samba
function and can be used. The purpose of the HOWTO is NOT to provide 
documented deployment guidance. It is my intent to put further examples
use into the Samba-3 by Example book.

- John T.

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