modules/keycloak-protocol-cas

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			# keycloak-protocol-cas
			This plugin for Keycloak Identity and Access Management (http://www.keycloak.org) adds the CAS 3.0 SSO protocol as an available client protocol to the Keycloak system. It implements the required Service Provider Interfaces (SPIs) for a Login Protocol and will be picked up and made available by Keycloak automatically once installed.

			# Features
			This plugin for Keycloak Identity and Access Management (http://www.keycloak.org) adds the CAS 3.0 SSO protocol
			as an available client protocol to the Keycloak system. It implements the required Service Provider Interfaces (SPIs)
			for a Login Protocol and will be picked up and made available by Keycloak automatically once installed.

			![Build status](https://github.com/jacekkow/keycloak-protocol-cas/workflows/Release/badge.svg)

			## Features

			The following CAS features are currently implemented:
			* CAS 1.0/2.0/3.0 compliant Login/Logout and Service Ticket Validation
			* Single Logout (SLO)
			* Filtering of provided `service` against configured redirect URIs
			* JSON and XML response types
			* Mapping of custom user attributes to CAS assertion attributes

			The following features are curently missing:
			* Proxy ticket service and proxy ticket validation [CAS 2.0]
			* Long-Term Tickets - Remember-Me [CAS 3.0 - optional]
			The following features are missing:
			* SAML request/response [CAS 3.0 - optional]
			* Proxy ticket service and proxy ticket validation [CAS 2.0]

			# Installation
			1. Clone or download this repository (pre-compiled releases will follow!)
			2. Run `mvn package` to build the plugin JAR
			3. Copy the JAR file generated in the `target` folder into the `providers` directory in your Keycloak server's root
			4. Restart Keycloak
			The following features are out of scope:
			* Long-Term Tickets - Remember-Me [CAS 3.0 - optional]

			# Configuration
			To use the new protocol, you have to create a client within Keycloak as usual.
			Important: Due to [KEYCLOAK-4270](https://issues.jboss.org/browse/KEYCLOAK-4270), you have to select the `openid-connect` protocol when creating the client and change it after saving.
			As the CAS protocol does not transmit a client ID, the client will be identified by the redirect URIs (mapped to CAS service). No further configuration is necessary.
			## Compatibility

			The CAS plugin has been tested against the same Keycloak version as the plugin version.

			As a rule of thumb plugin version should match your Keycloak version.

			## Installation

			Installation of a compatible plugin version is simple and can be done without a Keycloak server restart.

			1. Download the latest release compatible with your Keycloak version from the [releases page](https://github.com/jacekkow/keycloak-protocol-cas/releases).
			2. Copy the JAR file into the `standalone/deployments` directory in your Keycloak server's root.

			Remember to update plugin artifact with each Keycloak server upgrade!

			## Configuration

			To use the new protocol, you have to create a client within Keycloak as usual, selecting `cas` as protocol.
			As there is no client ID indication in protocol, the client will be identified by the redirect URIs
			configured in Keycloak.

			Enter `https://your.keycloak.host/auth/realms/master/protocol/cas` as the CAS URL into your SP.
			This assumes that you use the default `master` realm - if not, modify the URL accordingly.

			# Disclaimer
			This plugin was implemented from scratch to comply to the official CAS protocol specification, and is based heavily on the OpenID Connect implementation in Keycloak.
			Note that some client implementations require you to enter login and validate URLs, not CAS URL!
			This manifests with "Page Not Found" error on login attempt
			(see [issue #27](https://github.com/jacekkow/keycloak-protocol-cas/issues/27) for example).
			In such case append `/login` to the CAS URL to get the "login URL".
			Similarly append `/serviceValidate` to get the "validate URL".

			## Disclaimer

			This plugin was implemented from scratch to comply to the official CAS protocol specification,
			and is based heavily on the OpenID Connect implementation in Keycloak.
			It is licensed under the Apache License 2.0.

			# References
			[1] http://www.keycloak.org
			This repo is a fork of https://github.com/Doccrazy/keycloak-protocol-cas
			and includes changes for Keycloak 8 and newer that were not merged by the owner for half a year.

			## References

			[1] https://www.keycloak.org/
			[2] https://issues.jboss.org/browse/KEYCLOAK-1047 (Support CAS 2.0 SSO protocol)
			[3] https://apereo.github.io/cas/4.2.x/protocol/CAS-Protocol-Specification.html
			[4] https://keycloak.gitbooks.io/server-developer-guide/content/topics/providers.html