I'm using StatusNet 0.9.6. The OS is Windows 7. The php is running on XAMPP 1.7.3 and the jsp is running on Tomcat 7.0.4. The CAS server is 22.214.171.124.
When I enabled the plugin CasAuthentication by adding the following sentence in config.php, I find that the user can log in the StatusNet without username and password. When the user click the hypertext login, the user logged in. When the user click the hypertext logout, the user logged out. The login page does not display, so the username and password are not needed.