[Samba] winbind auth using ADS with domain trusts

John H Terpstra jht at samba.org
Sun Dec 4 15:25:22 GMT 2005

On Sunday 04 December 2005 01:20, SAMBA wrote:
> 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
> winbindd.

Check the information regarding the pam_updatedb and pam_ccreds open source 
modules available on the PADL web site. 

> 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.

This can already be done using MS ADAM on the ADS servers, and then using the 
ADS LDAP server for IDMAP storage. You simply need to specify the LDAP server 
to the "idmap backend" parameter.

> 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).

Specifically, what are you trying to achieve that has not already been 

- John T.

>  - 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
> the
> > > > use of winbindd when authenticating against one domain (lets call
> it
> > > > '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
> help
> 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
> servers
> that are domain members. Mastery of domain member servers will help you
> with
> 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
> resources
> 			that are used in the trusting domain. If you do
> not do this,
> 			foreign domain users and groups will operate
> with
> 			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
> possible
> 			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
> that
> knowledge.
> I am the first to admit that the HOWTO does not provide a neatly
> integrated
> guide to setting up a domain member server, nor does it provide a
> detailed
> document to describe use of interdomain file and directory access. I'd
> much
> appreciate it if someone would contribute a well documented chapter on
> these
> subjects.
> Despite all this, I strongly believe that the domain controller, backup
> domain
> controller and domain membership chapters in the HOWTO are in need of
> restructuring. I am working on the next generation documentation that
> will
> 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
> features
> 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
> of
> use into the Samba-3 by Example book.
> - John T.
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John H Terpstra
Samba-Team Member
Phone: +1 (650) 580-8668

The Official Samba-3 HOWTO & Reference Guide, 2 Ed., ISBN: 0131882228
Samba-3 by Example, 2 Ed., ISBN: 0131882221X
Hardening Linux, ISBN: 0072254971
Other books in production.

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