@cho l'eunuchs kinda does. DBus and freedesktop shit does not. L'Eunuchs can grant or deny access to various resources based on your user and what not. The problem is, once you get access to dbus bus, all bets are off and you're a god. And since more and more programs use dbus for ipc, l'eunuchs security is compromised.
PurpCat