Actually, it supports Version 2 and 3 CAS external authentication server. The project have been designed to support any kind of external authentication server. Developers can use the CAS example to develop a new one.
While there is good documentation it was still a lot of trial and error to get all configurations working to my liking. There is detailed logging functionality but debugging Joomla is still quicker for those who can do that. Getting federated login to work is probably always going to be painful...
If you want CAS this package is way better than writing it yourself!
Sadly, although the installation seems to succeed, attempting to add a Server brings up a blank modal dialog box. I seem to have installed and enabled all the required pieces so I am at a loss. Any suggestions from succesful installers or the developer would be appreciated...
Of course this is a very particular extension, and not everybody would need this.
But if you do, it perfectly does the job.
We are using it at our university, were we are working with Joomla! for almost 4 years.
It can be hard if you are not familiar with CAS, but become really powerfull if you dig into it.
Thanks for this extension, a must have for us.