The design feels a bit peculiar: - the "client" mode is a privileged mode, and the "daemon" mode is an unprivileged which is kind of unexpected. Usually one would expect the opposite. - the "client" which actually registers a service on the D-Bus system bus only shortly appears to send out this signal and then disappears again. Usually a serivce should be long running. Apart from these peculiar bits I don't see any security relevant issues though. I started the whitelisting process for Factory.