AD authentication for local users

[Mark Drayton]

Hi

We have a lot of Linux development servers (RHEL 5.3, Samba 3.0.33)
which are generally accessed via SSH. Each developer has a local
account on each box, managed by Puppet. Logins are via private keys
only; there are no local passwords.

I'd like to run Samba on these boxes and authenticate against our AD
domain. I don't want AD authentication for anything besides Samba --
the only other service we run is SSH via keys.

Here's my smb.conf:

[global]
 workgroup = DOMAIN
 server string = Samba Server Version %v
 security = ADS
 realm = DOMAIN.FQDN
 encrypt passwords = yes
 log level = 3
 log file = /var/log/samba/%U.log

[homes]
 comment = Home Directories
 browseable = no
 writable = yes

I'm pretty sure the Kerberos configuration is fine as I've joined the domain.

Relevant (ie, non-standard) nsswitch.conf lines:

passwd:     files winbind
group:      files winbind

It looks like the problem is AD UID to UNIX UID mapping. The default
TDB backend will create 'virtual' UNIX accounts on demand but I don't
want this -- I want user 'foo' to map to the local user 'foo'. If I
add idmap uid and idmap gid lines the users authenticate okay but the
TDB idmap backend wants to map a new user instead of using the
existing UNIX account by the same name.

Is this a workable configuration? I feel like I've tried every
combination of PAM fiddling and idmap settings possible for what seems
like a straightforward setup.

Cheers,

Mark
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[Adam Nielsen-2]

> It looks like the problem is AD UID to UNIX UID mapping. The default
> TDB backend will create 'virtual' UNIX accounts on demand but I don't
> want this -- I want user 'foo' to map to the local user 'foo'. If I
> add idmap uid and idmap gid lines the users authenticate okay but the
> TDB idmap backend wants to map a new user instead of using the
> existing UNIX account by the same name.

Have you looked at the 'username map' option?  AFAIK you will need to
map AD to UNIX users by hand if you don't want the autocreate behaviour.
 You might be able to script the production of the username mapping file
though, which would automate it to a certain extent.

Cheers,
Adam.
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