After struggling some time with CAS, I finally ended up working with SimpleSAMLphp package. I can recommend it as really simple yet powerful software. The package contains ready-to-use SAML 2.0 IdP site and provides PHP API to integrate your application with SAML 2.0 Service Provider functionality. The handling of the actual authentication process is delegated to a rich set of authentication modules, and in case no build-in module fits your needs – you have all the power to implement your own module in hours.
SimpleSAMLphp – my favorite SAML 2.0 software package
