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Practical Linux Security Cookbook

You're reading from Practical Linux Security Cookbook Secure your Linux environment from modern-day attacks with practical recipes

Product type Paperback

Published in Aug 2018

Publisher Packt

ISBN-13 9781789138399

Length 482 pages

Edition 2nd Edition

Tools

Linux

Concepts

Information Security

Author (1):

Kalsi

View More author details

Table of Contents (20) Chapters

Title Page

Copyright and Credits

Contributors

Packt Upsell

Preface

1. Linux Security Problem FREE CHAPTER

2. Configuring a Secure and Optimized Kernel

3. Local Filesystem Security

4. Local Authentication in Linux

5. Remote Authentication

6. Network Security

7. Security Tools

8. Linux Security Distros

9. Bash Vulnerability Patching

10. Security Monitoring and Logging

11. Understanding Linux Service Security

12. Scanning and Auditing Linux

13. Vulnerability Scanning and Intrusion Detection

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Index

Limiting login capabilities of users

As a Linux system administrator, you may want to restrict access to a Linux system for specified users or groups. In this section, we will learn how to use two files, /etc/securetty and /etc/security/access.conf, to restrict user access.

Getting ready

All the steps given here have been tried on an Ubuntu system; however, you can follow these on any other Linux distribution also.

How to do it...

Let's learn how to edit the two files mentioned before to apply different restrictions to user access on a Linux system:

First, we will check the content of the /etc/securetty file using themore command:

more /etc/securetty

As we can see in the preceding screenshot, the file specifies the Terminals on which root is allowed to log in.

Now, edit the file using any editor of your choice and comment the tty1 entry as shown here:

Save and exit the editor after making the changes mentioned in the preceding step.

Now, switch to Terminal tty1 by running the command chvt 1. If we...

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Authors (1)

Kalsi

Kalsi

Tajinder Kalsi is an innovative professional with more than 9 years' progressive experience within the information security industry. He has a good amount of knowledge and experience in web application testing, vulnerability assessment, network penetration testing, and risk assessment. At present, he is working as an information security consultant. He started his career with Wipro as a technical associate, and later on he became an ISMS consultant-cum-technical evangelist. In his free time, he conducts seminars in colleges all across India on various topics, in more than 125 colleges; he has spoken to 10,000+ students. Tajinder is a certified ISO 27001:2013 Auditor. Tajinder authored Practical Linux Security Cookbook published by Packt Publishing. He has also reviewed the following books: Web Application Penetration Testing with Kali Linux and Mastering Kali Linux for Advanced Penetration Testing. He has also authored three video courses with Packt: Getting Started with Pentensing, Finding and Exploiting Hidden Vulnerabilities, and Pentesting Web Applications. He is best described as dedicated, devoted, and determined and a person who strongly believes in making his dreams come true. He defines himself as a tireless worker, who loves to laugh and make others laugh. He is also very friendly and level-headed. https://www.linkedin.com/in/tajinderkalsi/.

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