We (namely Nima) have written auth-cas, it is currently being tested with one installation (where it seems to work) and we plan to setup a CAS server for cognovis.de which will have the user accounts for all employees of cognovis, so we have a single signon on all customer sites (for us).
If you are in dire need of this package, we can send it "as is" to you, and you can just get rid of certain customizations with which we toyed around in our process so far under the condition you release it once working. Alternatively you can just wait until the have our setup running at cognovis (probably within a months).