I am trying to find an SSO server written in PHP that is either open source or free which meets the following needs...
- Authenticate users against multiple Samba directories
- Get user groups from directory
- Easy to use server side code for integrating into internal PHP software for authenticating users and getting the users groups
- Easy to change the login form template to match website theme
- Support for authenticating not just against sub domains of the same root domain but also cross domain support
As an example I am after something similar to the way Stack Exchange manages authentication across all stack exchange sites but in PHP not in .NET.