You're reading from Mastering Defensive Security Effective techniques to secure your Windows, Linux, IoT, and cloud infrastructure

Product type Paperback

Published in Jan 2022

Publisher Packt

ISBN-13 9781800208162

Length 528 pages

Edition 1st Edition

Languages

SQL

Tools

Kali Linux

Concepts

Cybersecurity

Author (1):

Cesar Bravo

View More author details

Table of Contents (23) Chapters

Preface

1. Section 1: Mastering Defensive Security Concepts

2. Chapter 1: A Refresher on Defensive Security Concepts FREE CHAPTER

3. Chapter 2: Managing Threats, Vulnerabilities, and Risks

4. Chapter 3: Comprehending Policies, Procedures, Compliance, and Audits

5. Chapter 4: Patching Layer 8

6. Chapter 5: Cybersecurity Technologies and Tools

7. Section 2: Applying Defensive Security

8. Chapter 6: Securing Windows Infrastructures

9. Chapter 7: Hardening a Unix Server

10. Chapter 8: Enhancing Your Network Defensive Skills

11. Chapter 9: Deep Diving into Physical Security

12. Chapter 10: Applying IoT Security

13. Chapter 11: Secure Development and Deployment on the Cloud

14. Chapter 12: Mastering Web App Security

15. Section 3: Deep Dive into Defensive Security

16. Chapter 13: Vulnerability Assessment Tools

17. Chapter 14: Malware Analysis

18. Chapter 15: Leveraging Pentesting for Defensive Security

19. Chapter 16: Practicing Forensics

20. Chapter 17: Achieving Automation of Security Tools

21. Chapter 18: The Master's Compilation of Useful Resources

22. Other Books You May Enjoy

Enhancing the protection of the server by improving your access controls

ACLs enable Unix administrators to apply detailed fine-tuning of permissions that may not be possible to achieve with the commands specified in the previous section. Therefore, let's explore how to work with ACLs so that you can take advantage of them to enhance the application and management of permissions.

Viewing ACLs

First, you can use the getfacl {file_name} command to see the ACL of the specified file.

The following figure shows an example of a file with and without an ACL. Notice that, when the file has an ACL, it adds a new line with the permissions of the specified user on the ACL, in this case, the cesar user and their associated permissions (rwx):

Figure 7.19 – View of the getfacl command

You can also identify whether a file has an ACL by doing a long listing (ls –l):

Figure 7.20 – Listing of a file with an ACL

The...