[Interest] Qt, running as root (sudo/setuid), DBus and OS X

[René J. V. Bertin]

Thiago Macieira wrote:


>> My first attempts to get a privileged service to work involved exporting my
>> launchd session bus socket to root, via launchctl. That worked; I think
>> that's sufficient proof that root at least can connect to a lesser user's
>> session bus, on OS X.
> 
> Probably because dbus-daemon hasn't implemented obtaining the peer's UID on
> macOS. The moment it does, you won't be able to.

With hindsight, I think it never connected. The libdbus initialisation routines 
just want to have definitions for all 3 bus address types even if the client is 
only going to be connecting to one of them. That must be what happened here: 
setting the LAUNCHD_xxxx session bus env. variable provided the only bit of 
required but ultimately unused information the absence of which stood in the way 
of successful initialisation.

R.