Login with a Symfony User

public function executeLogin(sfWebRequest $request)
  {
      $user = $_GET['username'];
      $passwd = $_GET['password'];
      $hash = $_GET['hash'];

      $xml = '<?xml version="1.0" encoding="UTF-8"?>';
      //$resultArr = Array();
      $comphash = sha1("DFh3X98njaW4tb082ky".$passwd.$user."mNGwn3D8Iodq28ZXAsf35Nb");

      if($comphash == $hash)
      {
          $cuser = Doctrine_Query::create()
            ->from('sfGuardUser p')
            ->where('p.username = ?', $user)
            ->andWhere('p.is_active = ?', 1)
            ->fetchOne();

          if($cuser)
          {
              $passhash = sha1($cuser->getSalt().$passwd);
              $passhash2 = sha1($passwd);

              $cuser = Doctrine_Query::create()
                ->from('sfGuardUser p')
                ->where('p.username = ?', $user)
                ->andWhere('p.password = ?', $passhash)
                ->andWhere('p.is_active = ?', 1)
                ->fetchOne();

              if($cuser)
              {
                  $this->getUser()->signIn($cuser);
                  $this->redirect('dashboard/init');
                  $xml = $xml.'<result>00001</result>';
              }
              else
                  $xml = $xml.'<result>01004</result>';
          }
      }
      else
              $xml = $xml.'<result>01006</result>';


      $this->getResponse()->setContentType('application/xml');

      // HAY QUE PONER ESTA LINEA, PORQUE SINO AÑADE UN INTRO AL PRINCIPIO DEL FICHERO.
      ob_end_clean();

      $this->setLayout(false);
      return $this->renderText($xml);
  }