December 2016
Intermediate to advanced
300 pages
6h 36m
English
Content preview from SELinux System Administration - Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Replacing existing policies
When adding custom SELinux policies, all that users can do is to add more allow rules. SELinux does not have a deny rule that can be used to remove currently allowed access rules from the active policy.
If the current policy is too permissive to the administrator's liking, then the administrator will need to update the policy rather than just enhance it. And that implies that the administrator has access to the current SELinux policy rules used.
Replacing existing policies depends on the SELinux user space utilities (the more recent one supports priority-based loading) and the source of the current policy. Let's look at two approaches: one for RHEL and another for Gentoo Linux.
Replacing RHEL policies
To replace an active ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.