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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

Creating different configurations for different hosts

For a change of pace, let’s look at the client’s end now. This time, we’ll look at a handy trick to help ease the pain of logging into different servers that require different keys or SSH options. This also allows you to access servers via easy-to-remember names, rather than having to remember multiple server IP addresses. All you have to do is go into the .ssh directory in your own home directory and create a config file. To demonstrate this, let’s create a configuration that allows us to easily access server1. In the ~/.ssh/config file, we can add a stanza that looks something like this:

Host server1
 Hostname 192.168.0.8
 User donnie
 IdentityFile ~/.ssh/server1_id_rsa
 IdentitiesOnly yes
 ForwardX11 yes
 Cipher [email protected]

Here’s the breakdown:

  • Host: This is the common name that you can use in your login command.
  • Hostname: For this, use either the IP address...
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