FIM 2010 can provide user authentication?

Hi

Can FIM 2010 be used to provide authentication to a 3th party applcation developed, for example, in .NET?

These are the steps the application must accomplish:

1. User provides his username and his password on login page.

2. .NET app calls FIM 2010 and validate user and password with the user informations created in a previous synchronization with AD.

Thanks