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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 CENTOS

pam_krb5_cchelper

pam_krb5_cchelper(8)					   System Administrator's Manual				      pam_krb5_cchelper(8)

NAME

       //usr/$LIB/security/pam_krb5/pam_krb5_cchelper - Credential cache helper

SYNOPSIS

       pam_krb5_cchelper [-c|-u|-d] [ccname] [uid] [gid]

DESCRIPTION

       The pam_krb5.so module uses pam_krb5_cchelper to create, update, and remove credential caches.

ARGUMENTS

       -c|-u|-d
	      A  flag  indicating whether the helper is expected to create, update, or destroy a ccache.  When creating a ccache, the ccname argu-
	      ment should be a name or a pattern ending in XXXXXX.  When updating or deleting a ccache, the ccname argument should be the name	of
	      an extant ccache.

       ccname A credential cache name or name pattern of the form TYPE:/tmp/foo or TYPE:/tmp/fooXXXXXX.

       uid    An  optional  numeric  UID which the helper will attempt to switch to before creating a ccache.  The helper continues in its task if
	      the attempt fails.

       gid    An optional numeric GID which the helper will attempt to switch to before creating a ccache.  The helper continues in  its  task	if
	      the attempt fails.

OPERATION

       The helper will read contents from its standard input.
       If input of suitable length is not read, the specified credential cache is deleted.
       If  input  of  suitable	length is read, a temporary file is created and the input is stored to the file.  If TYPE is FILE, the file's name
       will be based on the pattern and the name of this new credential cache will be printed.	If TYPE is not FILE, a new credential  cache  will
       be  created and the contents of the temporary file will be treated as a credential cache whose contents will be copied into the new creden-
       tial cache, whose name will be printed.

FILES

       //usr/$LIB/security/pam_krb5.so

SEE ALSO

       mkstemp(3) pam_krb5(5) pam_krb5(8)

BUGS

       Probably, but let's hope not.  If you find any, please file them in the bug database at http://bugzilla.redhat.com/ against the	"pam_krb5"
       component.

AUTHOR

       Nalin Dahyabhai <nalin@redhat.com>

Red Hat Linux							    2013/04/16						      pam_krb5_cchelper(8)