public function getConfigValues($subSection = null) {
        $config = Zend_Registry::get('config');
        // set defaults
        $values = $this->_defaultConfigValues;
        if ($config->auth) {
            $values = array_merge($values, $config->auth->toArray());
        }
        if ($subSection) {
            return array_get($values, $subSection);
        }
        return $values;
    }