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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

Setting and enforcing password and account expiration

Something you never want is to have unused user accounts remain active. There have been incidents where an administrator set up user accounts for temporary usage, such as for a conference, and then just forgot about them after the accounts were no longer needed.

Another example would be if your company were to hire contract workers whose contract expires on a specific date. Allowing those accounts to remain active and accessible after the temporary employees leave the company would be a huge security problem. In cases like these, you want a way to ensure that temporary user accounts aren’t forgotten about when they’re no longer needed. If your employer subscribes to the conventional wisdom that users should change their passwords on a regular basis, then you’ll also want to ensure that it gets done.

Password expiration data and account expiration data are two different things. They can be set either...

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