movim_ynh/sources/app/controllers/AdminloginController.php

<?php
use Movim\Controller\Base;

class AdminloginController extends Base
{
    function load()
    {
        $this->session_only = false;
    }

    function dispatch()
    {
        $this->page->setTitle(__('page.administration'));

        $cd = new \Modl\ConfigDAO();
        $config = $cd->get();

        if($config->username == $_POST['username']
        && $config->password == sha1($_POST['password'])) {
            $_SESSION['admin'] = true;
            $this->name = 'admin';
        }
    }
}