April 2015
Beginner
912 pages
25h 14m
English
Content preview from Linux Bible, 9th 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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Enhancing Linux Security with SELinux
IN THIS CHAPTER
Learning about SELinux benefits
Learning how SELinux works
Setting up SELinux
Fixing problems with SELinux
Getting additional information on SELinux
Security Enhanced Linux (SELinux) was developed by the National Security Agency (NSA) along with other security research organizations, such as Secure Computing Corporation (SCC). SELinux was released to the open source community in 2000 and became popular when Red Hat included SELinux in its Linux distributions. Now, SELinux is used by many organizations and is widely available.
Understanding SELinux Benefits
SELinux is a security enhancement module deployed on top of Linux. It provides additional security measures, is included by default, and is set to be in Enforcing mode in RHEL and Fedora.
SELinux provides improved security on the Linux system via Role Based Access Controls (RBAC) on subjects and objects (aka processes and resources). “Traditional” Linux security uses Discretionary Access Controls (DAC).
SELinux is not a replacement for DAC. Instead, it is an additional security layer.
- DAC rules are still used when using SELinux.
- DAC rules are checked first, and if access is allowed, then SELinux policies are checked.
- If DAC rules deny access, SELinux policies are not reviewed.
If a user tries to execute a file that he does not have execute access to (rw-), the “traditional” ...
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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.