config.php

    $moxieManagerConfig['authenticator'] = 'SymfonyAuthenticator';
    
    // we go back to the root of the project assuming tiny_mce folder is under web.
    // Example value : $path = realpath(dirname(__FILE__) . '/../../../../../../../../config/ProjectConfiguration.class.php');
    $moxieManagerConfig['SymfonyAuthenticator.project_configuration_path'] = '';
    
    // Example value 'frontend'
    $moxieManagerConfig['SymfonyAuthenticator.application_name'] = '';
    
    // Example value 'prod'
    $moxieManagerConfig['SymfonyAuthenticator.application_env'] = '';
    
    // Example value 'ROLE_MOXIEMANAGER'
    $moxieManagerConfig['SymfonyAuthenticator.credential'] = '';

Plugin.php

<?php

/**
 * This class handles MoxieManager SymfonyAuthenticator (Symfony < 2.x).
 *
 * @author Tristan Bessoussa <tristan.bessoussa@gmail.com>
 */
class MOXMAN_SymfonyAuthenticator_Plugin implements MOXMAN_Auth_IAuthenticator
{
    public function authenticate(MOXMAN_Auth_User $user)
    {
        $config = MOXMAN::getConfig();

        if ($config->get('SymfonyAuthenticator.application_name') == '') {
            die('You should define a symfony application name in Moxiemanager config file.');
        }

        if ($config->get('SymfonyAuthenticator.application_env') == '') {
            die('You should define a symfony application environement in Moxiemanager config file.');
        }

        if ($config->get('SymfonyAuthenticator.project_configuration_path') == '') {
            die('You should define a symfony project configuration path in Moxiemanager config file.');
        }

        require_once($config->get('SymfonyAuthenticator.project_configuration_path'));

        $configuration = ProjectConfiguration::getApplicationConfiguration(
            $config->get('SymfonyAuthenticator.application_name'),
            $config->get('SymfonyAuthenticator.application_env'),
            false
        );

        $context = sfContext::createInstance($configuration);

        // Is the user authenticated ?
        if ($context->getUser()->isAuthenticated()) {

            // Do we need a special role to access to the moxiemanager ?
            if ($config->get('SymfonyAuthenticator.credential') != '') {
                if ($context->getUser()->hasCredential($config->get('SymfonyAuthenticator.credential'))) {
                    return true;
                } else {
                    return false;
                }
            }

            return true;
        }

        return false;
    }
}

MOXMAN::getAuthManager()->add("SymfonyAuthenticator", new MOXMAN_SymfonyAuthenticator_Plugin());