function identify($user=null,$conditions=null){

        if (empty($user)) {
            $user = $this->user();
            if (empty($user)) {
                return null;
            }
        } elseif (is_object($user) && is_a($user, 'Model')) {
            if (!$user->exists()) {
                return null;
            }
            $user = $user->read();
            $user = $user[$this->userModel];
        } elseif (is_array($user) && isset($user[$this->userModel])) {
            $user = $user[$this->userModel];
        }



        if (isset($user[$this->fields['username']]) && !empty($user[$this->fields['username']])  && !empty($user[$this->fields['password']])) {
                if (trim($user[$this->fields['username']]) == '=' || trim($user[$this->fields['password']]) == '=') {
                    return false;
                }

                    $username = $user[$this->fields['username']];
                    $password = $user[$this->fields['password']];

            } elseif (isset($user[$this->userModel . '.' . $this->fields['username']]) && !empty($user[$this->userModel . '.' . $this->fields['username']])) {
                if (trim($user[$this->userModel . '.' . $this->fields['username']]) == '=' || trim($user[$this->userModel . '.' . $this->fields['password']]) == '=') {
                    return false;
                }

                    $username = $user[$this->userModel . '.' . $this->fields['username']];
                    $password = $user[$this->userModel . '.' . $this->fields['password']];

            } else {
                return false;
            }

        $ldap = new Ldapoperator();

        $authenticates = $ldap->auth($username, $password);

        if($authenticates){

                $userObject=new $this->userModel;
        $user=$userObject->find("first",
                                    array(
                                        'conditions'=> array(
                                            $this->fields['username']=>$username
                                            )
                                        )
                                    );
                if ($user)
                    return parent::identify($user,$conditions);
        }

        return null;

  }