We have shell web application which shows different applications allowed to logged in user. We use Drupal/CAS server to authenticate/log in to this application. Once user is logged in, he/she does not have to login to other applications. Same credentials are passed to other applications. Now we want to integrate Magento in this application, say user1 logs into our shell web application, he/she will see link to magento store, when he clicks on it, it will automatically get logged into Magento site and don't have to enter user id/password.
Our authentication service uses CAS server under Drupal.
Thanks