The website where your user will be redirected if he/she is not logged in, will probably send POST request back to the site/login action upon sucessful/bad authentication action. So inside site/login action you can write something like this:
Yii::app()->request->getPost('email');//This is equal to $_POST['email']
Yii::app()->request->getPost('status');//This is equal to $_POST['status']
So you are retreaving email and status from the POST array. You have to know what data will be sent from the third party website, in order to retreave it.