To enable client applications to obtain information about authenticated users, the CAS server must be configured to resolve attributes and release them to the clients.

Version 3 of the CAS protocol, which was first supported by CAS 4.0, contains native support for returning authentication/user attributes to clients. Version 2 of the CAS protocol, the version implemented by CAS 3.x, did not support attribute release; the SAML 1.1 protocol was used for that purpose. Most CAS clients have not yet been updated to support Version 3 of the protocol, so it’s still necessary to configure SAML 1.1-based attribute release.

Add the SAML 1.1 dependency to the project object model

To add SAML 1.1 support to the CAS server, edit the file pom.xml in the cas-overlay-template directory on the master build server (casdev-master) and locate the dependencies section (around line 69), which should look something like this:

<dependencies>
    <dependency>
        <groupId>org.apereo.cas</groupId>
        <artifactId>cas-server-webapp${app.server}</artifactId>
        <version>${cas.version}</version>
        <type>war</type>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.apereo.cas</groupId>
        <artifactId>cas-server-support-json-service-registry</artifactId>
        <version>${cas.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apereo.cas</groupId>
        <artifactId>cas-server-support-ldap</artifactId>
        <version>${cas.version}</version>
    </dependency>
</dependencies>

Insert a new dependency for the SAML 1.1 module:

<dependencies>
    <dependency>
        <groupId>org.apereo.cas</groupId>
        <artifactId>cas-server-webapp${app.server}</artifactId>
        <version>${cas.version}</version>
        <type>war</type>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.apereo.cas</groupId>
        <artifactId>cas-server-support-json-service-registry</artifactId>
        <version>${cas.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apereo.cas</groupId>
        <artifactId>cas-server-support-ldap</artifactId>
        <version>${cas.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apereo.cas</groupId>
        <artifactId>cas-server-support-saml</artifactId>
        <version>${cas.version}</version>
    </dependency>
</dependencies>

This will instruct Maven to download the appropriate code modules and build them into the server.

Rebuild the server

Run Maven again to rebuild the server according to the new model:

casdev-master# ./mvnw clean package
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building cas-overlay 1.0
[INFO] ------------------------------------------------------------------------
(lots of diagnostic output... check for errors)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 43.966 s
[INFO] Finished at: YYYY-MM-DDTHH:MM:SS-00:00
[INFO] Final Memory: 30M/76M
[INFO] ------------------------------------------------------------------------
casdev-master#

References