The protocol: http://jasig.github.io/cas/development/protocol/CAS-Protocol-Specification.html

Full documentation is hosted at http://txcas.readthedocs.org/

• Implements the CAS Protocol required sections (1-3).
• Easy to start/stop service that listens and responds to incoming requests. No external web server or web application container required.
• Open source Python code making heavy use of the Twisted networking library.
• Flexible plugin architecture, allowing customization of major architectural components.
• Plugins for Authentication (file, unix, LDAP), User Realms (basic, LDAP), Ticket Stores (in-memory, CouchDB), Service Managers (JSON), and View Providers (Jinja2 templates).
• Simple configuration.

Run the sample.py script as follows:

$ python sample.py

The CAS server will run on port 9800. Service 1 runs on port 9801. Service 2 runs on port 9802. Service 3 runs on port 9803. Service 4 runs on port 9804. All services listen on localhost (127.0.0.1).

Copy cas.cfg.example to cas.cfg. Copy cas.tac.example to cas.tac. Then edit the settings in both files. Run the service with:

$ twistd -n -y cas.tac

To run as a daemon (in the background even when you log out of the shell), omit the -n option.

You can also run the server and specify the options from the command line. The following example runs the server on port 9800.:

$ twistd -n cas -p 9800

To get a list of all command line options:

$ twistd -n cas --help

The HTML pages presented by txcas are fully customizable via view provider plugins. The included Jinja2 view provider allows you to design pages using powerful yet easy to use Jinja2 templates (see http://jinja.pocoo.org/docs/templates/).

A sample theme using Bootstrap 3 is available at https://github.com/cwaldbieser/txcas_extras.