How to make your app run as root?

asked 2015-09-20 16:52:30 +0200

Rikudou_Sennin gravatar image

updated 2015-09-20 16:57:30 +0200

Hello, I am trying to make an app that will start as root user, but I am not really experienced in C++.

My binary has a sticky UID 0 and in the code setuid(0).

And what really confuses me is that when I start the app from terminal (as nemo user) it has root privileges but when I start via desktop file, it runs as nemo user.

Can anybody help me with it?

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Comments

You really shouldn't make your app run as root. I think it's better to do a privileged DBus daemon running as root and then an un-privileged application that interfaces with it.

Regarding your problem, do you use invoker in your desktop file? Maybe that's the issue.

g7 ( 2015-09-20 18:27:02 +0200 )edit

Hello, I don't use invoker, how should I use it?

Rikudou_Sennin ( 2015-09-20 18:57:22 +0200 )edit

Ah, found it, thank you very much for pointing the way :) Can you please send some resources about using the DBus method?

Rikudou_Sennin ( 2015-09-20 19:04:36 +0200 )edit
1

DBus is pretty common in desktop Linux distributions, you'll find plenty of resources online. I never used the C++ bindings (nor the one provided by Qt) but this seems a good place to start: http://doc.qt.io/qt-5/examples-dbus.html

I have written an application for SailfishOS with a DBus service, written in vala: https://github.com/g7/jolla-settings-screenmonitor Maybe that's useful.

To interface with the service from the QML application, you can import org.nemomobile.dbus and use the DBusInterface object.

Ideally you should use Polkit to manage authentication but I don't know if there is a proper SailfishOS frontend for it (I remember that it was in the works before).

g7 ( 2015-09-20 20:31:08 +0200 )edit