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pam_krb5 UID mapping (clashing UIDs)

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Operating Systems Linux Red Hat pam_krb5 UID mapping (clashing UIDs)
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Old 10-19-2011
Question pam_krb5 UID mapping (clashing UIDs)
Hi,

I'm considering implementing pam_krb5 on RHEL 5.5 and Solaris 10, and I'm in an environment that has a number of legacy NIS domains. They've all been migrated into Active Directory, RFC2307, with the NIS maps that differed in each domain kept within its own container. However, users and groups have been merged together.

This now lends itself to an interesting problem. Some users have clashing UIDs. User 'joe' might login to a machine in domain 'A' and should rightly have UID 120. However, when 'joe' logs into a machine in domain 'B' he's going to need a UID of say 140. Same username, different UID.

We need a way of overriding the UID, GID, home directory and login shell for particular users on a domain-by-domain basis. I've seen this done with commercial products using GPOs in AD, and I'm guessing, some funky pam_krb5 code?

Can anyone think of either a) how we might achieve this using features already available in one or other pam_krb5, or b) if I have to hack someone's pam_krb5 to do this which one I should pick and which features this might be most similar to?

I'm a C whizz, so don't mind hacking a solution, but would rather not re-invent the wheel.

Thanks,
Mark.

p.s. it's not possible to clean up the data (too big a problem).
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LEARN ABOUT FREEBSD

idmap_ad

IDMAP_AD(8)                                                 System Administration tools                                                IDMAP_AD(8)

NAME

       idmap_ad - Samba's idmap_ad Backend for Winbind

DESCRIPTION

       The idmap_ad plugin provides a way for Winbind to read id mappings from an AD server that uses RFC2307/SFU schema extensions. This module
       implements only the "idmap" API, and is READONLY. Mappings must be provided in advance by the administrator by adding the
       posixAccount/posixGroup classes and relative attribute/value pairs to the user and group objects in the AD.

IDMAP OPTIONS

       range = low - high
           Defines the available matching UID and GID range for which the backend is authoritative. Note that the range acts as a filter. If
           specified any UID or GID stored in AD that fall outside the range is ignored and the corresponding map is discarded. It is intended as
           a way to avoid accidental UID/GID overlaps between local and remotely defined IDs.

       schema_mode = <rfc2307 | sfu >
           Defines the schema that idmap_ad should use when querying Active Directory regarding user and group information. This can be either the
           RFC2307 schema support included in Windows 2003 R2 or the Service for Unix (SFU) schema.

EXAMPLES

       The following example shows how to retrieve idmappings from our principal and trusted AD domains. If trusted domains are present id
       conflicts must be resolved beforehand, there is no guarantee on the order conflicting mappings would be resolved at this point. This
       example also shows how to leave a small non conflicting range for local id allocation that may be used in internal backends like BUILTIN.

                [global]
                idmap backend = tdb
                idmap uid = 1000000-1999999
                idmap gid = 1000000-1999999

                idmap config CORP : backend  = ad
                idmap config CORP : range = 1000-999999

AUTHOR

       The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open
       Source project similar to the way the Linux kernel is developed.

Samba 3.5                                                           06/18/2010                                                         IDMAP_AD(8)