[support] Active Directory groups with Drupal for customised homepage?

Good evening,

How do I integrate ActiveDirectory with Drupal?

Basically I want each user to be automatically logged into Drupal if they're logged in through Active Directory, for there Drupal accounts to automatically be created, and for there home-screens to be different based off there Active Directory group.

I'm building a small Intranet, and want specific things to be displayed based on users' GP groups. Each employee will have a form to send ticket to HelpDesk, IT KnowledgeBase and then a set of "blocks" based on there role (i.e. an account would have a calcuator amongst other things), but the user should also be able to add/remove blocks and move blocks around.

Are there projects and/or sets of modules which I can use to make this system work? (i.e.: ldap_provisioning)

Alternatively should I be looking at a different CMS?

Thanks for all suggestions,

Alec Taylor