Hi Danny,
We're running all of our production system through our central authentication system. The code we're using is described on the wiki at http://webwork.maa.org/wiki/Authentication and is checked in (it's the Cosign.pm module).
I believe the UC Merced is also using their central system for authentication; I worked with them some on that, resulting in the partial documentation on their system that's there. I'm sure they could provide the working code for you if that sounds like what you need.
Gavin
Features & Development
CAS Authentication
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