////
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
////

[[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 xref:springSecurityCore.adoc#springSecurityCore[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.