Authentication

I've created a function to implement a single sign-on to Moodle and Novell web services such as NetStorage and Groupwise WebAccess (for eDirectory users). Basically it takes the username and password, then uses cURL to authenticate with NetStorage, and forwards the session cookie back to the user's browser.

The code probably needs some messing with to make it a bit more universal, but my main question is to the best way of integrating with Moodle (it's just a script in /local which I have to run manually atm ). Would it serve best as a separate authentication plug-in (if it's possible to have the authentication use it as well as the LDAP plugin?) or as an optional patch to the LDAP plugin for eDirectory users? Or am I barking up the wrong tree entirely?