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[[cas-introduction]]
== Introduction to the Spring Security CAS Plugin

The CAS plugin adds https://www.jasig.org/cas[CAS] single sign-on support to a Grails application that uses Spring Security. It depends on the https://github.com/apache/grails-spring-security[Spring Security Core plugin].

Once you have configured a CAS server and have configured your Grails application(s) as clients, you can authenticate to any application that is a client of the CAS server and be automatically authenticated to all other clients.