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|Tutorial Series||PolicyKit Tutorial|
|What's Next|| None
Applications running under root privileges has always been a major problem in Linux, and PolicyKit was created exactly to make the whole process easier and more secure. Though, running applications as root, even if small and controlled, can be still a major issue. So there are a few things you should take in account that will help you minimize possible issues:
If you are aware of this, and you're also sure that your application actually needs root privileges, you can go on reading.
What is cool about PolicyKit and this approach is that we need to write a minimum portion of code, don't need hacks or executon bits, and we actually get root privileges for a minimum portion of code. Suppose we still have our foo application we saw in the precedent Tutorial. From our .policy file, we know action2 actually does something that requires authentication as root. In fact, the following lines of code in action2 definitely require root privileges:
But foo is a huge program that runs as standard user apart from those lines. So the option is to make it run as root as a whole, or split those 4 lines in a different program running as root. That is the approach that we will take in this tutorial.
Our helper will be a standard QCoreApplication. We need to create the following stuff:
We already know how create Policy files, let's get deeper on the other points and let's try to understand what we need to do, how and why.