I\'m looking for a CAS server which supports Facebook/Twitter authentication via OAuth for Single-Sign-On. I\'ve checked JASIG-CAS server but it doesn\'t look support them. My j
Jasig CAS 3.5 will hopefully provide you with oauth authentication. It is not yet available as of writing this answer. But you can check out the release candidate of version 3.5.
Have a look here: https://wiki.jasig.org/display/CASUM/OAuth+client+support
The source for 3.5 RC1 is available here: https://github.com/Jasig/cas/
If your idea of integration of facebook twitter logins to cas is all about aggregation of various logins to one centralized login service, then this should be the right thing to look at.