integration with a user management system

I am looking for a project/product to maintain users, and I am
wondering what others are using.

My wish list would include:
    - Integration with CAS
    - A user can self register on the web.
    - Verifies user by replying to email address
    - Create a password policy that contains:
            + minimum length
            + special characters
            + length of time until password expires
    - Changing/Resetting of password over the web


Is there anything out there that comes close to meeting these needs ?


-Thanks
Steve More