User Access Lifecycle Management: Access based on employment?

[italynstylion]

Weird thread title I know....sorry for being vague

Basically, what I'm trying to do is make a vBulletin site where employees from two companies have access to register for the forum. Essentially, the forum will have somewhat confidential information inside of it and I want to limit access based on current employment by either of the two companies. This way, in the event someone leaves the company or gets fired they will no longer have access to the forum. I'll have access to two different employee databases (one per company) and I'm envisioning some sort of vBulletin utility that checks these databases for a user. If they exist then they get in.

Any tips or ideas for how to do this?