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Single Sign On: CAS Developer FAQ


In this article:

What version of CAS are you running?

We are running the Shibboleth IdP v3.3.1 which supports the CAS v3 protocol.


Who can authenticate with CAS?

All University of Maryland College Park (UMDCP) students, faculty, staff, and affiliates. Additionally employees and affiliates of UMES, UMCES, & USMO can authenticate.

For certain sites, former students and/or associates (guests) can authenticate. Please contact IT Service Desk if you desire this functionality.


What "username" is returned by CAS?

CAS will return the user's Directory ID. Additional attributes are available upon request.


Where can I learn how to use CAS with my web application?

See the CAS(Opens in a new window) web site (note that we currently support CAS 1/2). In particular, you will want to check out the clients(Opens in a new window) which have already been implemented in a variety of environments/languages.

Here is a little presentation(Opens in a new window) on how a CAS authentication works.


What are the URLs for the UM CAS server?

Login in a new window)
Logout in a new window)
Legacy Validate in a new window)
Service Validate in a new window)

See the CAS Protocol(Opens in a new window) specification for details on the parameters.


How can I stay informed?

All users of CAS are strongly encouraged to subscribe to the UMDIRECTORY listserv list by sending a message to with a body of Subscribe UMDIRECTORY.


What if I have additional questions about CAS?

For additional questions and or assistance please contact the administrators at