Book Image

Mastering Linux Security and Hardening

By : Donald A. Tevault
Book Image

Mastering Linux Security and Hardening

By: Donald A. Tevault

Overview of this book

This book has extensive coverage of techniques that will help prevent attackers from breaching your system, by building a much more secure Linux environment. You will learn various security techniques such as SSH hardening, network service detection, setting up firewalls, encrypting file systems, protecting user accounts, authentication processes, and so on. Moving forward, you will also develop hands-on skills with advanced Linux permissions, access control, special modes, and more. Lastly, this book will also cover best practices and troubleshooting techniques to get your work done efficiently. By the end of this book, you will be confident in delivering a system that will be much harder to compromise.
Table of Contents (15 chapters)
Title Page
Packt Upsell

Auditing system services

A basic tenet of server administration, regardless of which operating system we're talking about, is to never have anything that you don't absolutely need installed on a server. You especially don't want any unnecessary network services running because that would give the bad guys extra ways to get into your system. And, there's always a chance that some evil hacker might have planted something that acts as a network service, and you'd definitely want to know about that. In this chapter, we'll look at a few different ways to audit your system to ensure that no unnecessary network services are running on it.

Auditing system services with systemctl

On Linux systems that come with systemd, the systemctl command is pretty much a universal command that does many things for you. In addition to controlling your system's services, it can also show you the status of those services. We have the following code:

donnie@linux-0ro8:~> sudo systemctl -t service --state=active