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Mastering Linux Security and Hardening

You're reading from   Mastering Linux Security and Hardening A practical guide to protecting your Linux system from cyber attacks

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Product type Paperback
Published in Feb 2023
Publisher Packt
ISBN-13 9781837630516
Length 618 pages
Edition 3rd Edition
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Author (1):
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Donald A. Tevault Donald A. Tevault
Author Profile Icon Donald A. Tevault
Donald A. Tevault
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Table of Contents (22) Chapters Close

Preface 1. Section 1: Setting up a Secure Linux System
2. Running Linux in a Virtual Environment FREE CHAPTER 3. Securing Administrative User Accounts 4. Securing Normal User Accounts 5. Securing Your Server with a Firewall – Part 1 6. Securing Your Server with a Firewall — Part 2 7. Encryption Technologies 8. SSH Hardening 9. Section 2: Mastering File and Directory Access Control (DAC)
10. Mastering Discretionary Access Control 11. Access Control Lists and Shared Directory Management 12. Section 3: Advanced System Hardening Techniques
13. Implementing Mandatory Access Control with SELinux and AppArmor 14. Kernel Hardening and Process Isolation 15. Scanning, Auditing, and Hardening 16. Logging and Log Security 17. Vulnerability Scanning and Intrusion Detection 18. Prevent Unwanted Programs from Running 19. Security Tips and Tricks for the Busy Bee 20. Other Books You May Enjoy
21. Index

firewalld for Red Hat systems

For our next act, we turn our attention to firewalld, which is the default firewall manager on Red Hat Enterprise Linux 7 through 9 and all of their offspring.

As we just saw with ufw on Ubuntu, firewalld can be a frontend for either iptables or nftables. On RHEL/CentOS 7, firewalld uses the iptables engine as its backend. On the RHEL 8- and 9-type distros, firewalld uses nftables as its backend. Either way, you can’t create rules with normal iptables or nftables commands while firewalld is enabled because firewalld stores the rules in an incompatible format.

Until very recently, firewalld was only available for the newer RHEL versions and their offspring. Now, however, firewalld is also available in the Ubuntu repositories. So, if you want to run firewalld on Ubuntu, you finally have that choice. Also, the combination of firewalld and nftables now comes already installed and activated on the SUSE distros.

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