Central Authentication Service (CAS)

Apereo CAS - Enterprise Single Sign On for all earthlings and beyond.
Under Apache License 2.0
By apereo

java open-source aws authentication oauth2 spring-boot sso authorization spring-cloud ldap-authentication apache2 openidconnect sso-authentication websso saml2 spring-webflow spring-framework identity-provider u2f-server duosecurity

Central Authentication Service (CAS)


Welcome to the home of the Central Authentication Service project, more commonly referred to as CAS. CAS is an
enterprise multilingual single sign-on solution for the web and attempts to be a comprehensive platform for your authentication and authorization needs.

CAS is an open and well-documented authentication protocol. The primary implementation of the protocol is an open-source Java server
component by the same name hosted here, with support for a plethora of additional authentication protocols and features.


If you have already identified an enhancement or a bug, it is STRONGLY recommended that you submit a pull request to address the case.
There is no need for special ceremony to create separate issues. The pull request IS the issue and it will be tracked and tagged as such.


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Additional resources are available as follows:


It is recommended to deploy CAS locally using the WAR Overlay method. Cloning or downloading the CAS codebase
is ONLY required if you wish to contribute to the development of the project.


The following features are supported by the CAS project:

The foundations of CAS are built upon: Spring Boot and
Spring Cloud.


To build the project locally, please follow this guide.
The release schedule is available here.


CAS is 100% free open source software managed by Apereo, licensed under Apache v2. Our
community has access to all releases of the CAS software with absolutely no costs. We welcome contributions from our community of all
types and sizes. The time and effort to develop and maintain this project is dedicated by a group
of volunteers and contributors. Support options may be found here.
If you (or your employer) benefit from this project, please consider becoming a Friend of Apereo and contribute.