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Samba authentication to Kerberos via OpenLDAP, third and last try

So far answers I've received about this have been inconsistent at best and downright inaccurate at worst.  I'm going to try one more time and see if, at the very least, someone can give me a lead.  I ask you to consider what I'm asking remotely possible, and then seek a solution.  (Particularly before one blasts off an ill-thought out message that says simple, "Can't be done," simple because you've never done it or haven't heard of it being done.)  So consider this a challenge or a riddle.
  1. I have an OpenLDAP directory server that I am using for user and group information.  I would like to use it also to authenticate against.  This way, whatever I hook up to it (Samba, webstuff, PHP apps, CMS) can both authenticate and authorize from one source. 
  2. There is a separate Kerberos server that has users' campus-wide passwords.  I have access to it, but do not control it.
  3. I have a separate linux file server running Samba.  PCs and Macs will connect to it. 
I know I can do Kerberos authentication directly from Samba, but I'd prefer OpenLDAP do the Kerberos connection.  Here's why:  a) I can solve the problem once, rather than have to work out BOTH LDAP and Kerberos connections for every new authenticated service I add, and b) LDAP hooks are more common than Kerberos hooks for other services for which I will eventually want authentication and authroization.  And yes, I know it breaks the Kerberos model.

The question and the challenge:  Any leads on how I might convince Samba to pass the input password on to OpenLDAP so that OpenLDAP can authenticate it against Kerberos?



Wes Modes
Server Administrator & Programmer Analyst
McHenry Library
Computing & Network Services
Information and Technology Services