cakePHP 認証

class AppController extends Controller {
    public $components = array(
            'Session',
            'Auth' => array(
                    'loginRedirect' => array('controller' => 'users', 'action' => 'index'),
                    'logoutRedirect' => array('controller' => 'users', 'action' => 'index'),
            )
    );

}

class UsersController extends AppController {

public function beforeFilter() {
        parent::beforeFilter();
        $this->Auth->allow('add');
    }

    public function login() {
        if ($this->request->is('post')) {
            if ($this->Auth->login()) {
                $this->redirect($this->Auth->redirect());
            } else {
                $this->Session->setFlash(__('Invalid username or password, try again'));
            }
        }
    }

    public function logout() {
        $this->redirect($this->Auth->logout());
    }

    public function top_page(){

    }

App::uses('AppModel', 'Model','AuthComponent', 'Controller/Component');
public function beforeSave($options = array()) {
        if (isset($this->data[$this->alias]['password'])) {
            $this->data[$this->alias]['password'] = AuthComponent::password($this->data[$this->alias]['password']);
        }
        return true;
    }

<div class="users form">
< ?php echo $this->Session->flash('auth'); ?>
< ?php echo $this->Form->create('User'); ?>
< ?php
    echo $this->Form->input('username');
    echo $this->Form->input('password');
?>
< ?php echo $this->Form->end(__('Login')); ?>
</div>