pam_krb5 UID mapping (clashing UIDs) Post: 302566177

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Operating Systems Linux Red Hat pam_krb5 UID mapping (clashing UIDs) Post 302566177 by cambridge on Wednesday 19th of October 2011 04:47:33 PM

10-19-2011

Registered User

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).

cambridge

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LEARN ABOUT SUSE

pam_krb5_storetmp

pam_krb5_storetmp(8)					   System Administrator's Manual				      pam_krb5_storetmp(8)

NAME

       /lib64/security/pam_krb5/pam_krb5_storetmp - Temporary file helper

SYNOPSIS

       pam_krb5_storetmp pattern [uid] [gid]

DESCRIPTION

       The pam_krb5.so module uses pam_krb5_storetmp to create and remove temporary files.  It is not intended for any other use.

ARGUMENTS

       pattern
	      A  filename pattern of the form /tmp/fooXXXXXX.  A temporary file will be created using mkstemp(3) and any data provided to standard
	      input will be piped to the file.	Upon reading an end-of-file, the helper will print the name of the created file.
	      If the pattern does not end with the distinctive patterh XXXXXX, then the file is simply deleted.

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

FILES

       /lib64/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>

openSUSE							    2005/10/05						      pam_krb5_storetmp(8)