Is there an easy way to get th administration to run on secure environment (https)?

Add the following code to your administrator/index.php file ( after define( '_VALID_MOS', 1 ); )

// See if user is connecting via SSL
 if ($_SERVER["SERVER_PORT"] == "443" && $_SERVER['SERVER_NAME'] != "localhost") 
 {
   // reset site config var to SSL equiv
   $mosConfig_live_site = $mosConfig_live_site_SSL;
 }
 
 if ($_SERVER['SERVER_NAME'] != "localhost")
 {
   $host = $_SERVER["HTTP_HOST"];
   $uri = $_SERVER["REQUEST_URI"];
   $port = $_SERVER["SERVER_PORT"];
   $ssl_port = "443";
 
   if ($port != $ssl_port) 
   {
     header("Location: https://$host$uri");
   }
 }