Firstly we should know how to use the Bastille application to “harden” the Linux operating system so that it can function securely as it fulfills a specific role of your choice (e.g., as a Web server, as an E-mail server, and so forth).
You should also learn how to use your Linux system as an auditing tool to scan systems for vulnerabilities as well as create an Intrusion Detection System (IDS), which enables your Linux system to log and respond to suspicious activity. From virus protection to encrypting transmissions using Gnu Privacy Guard and FreeSWAN, you will be able to configure your system to secure local data as well as data that will be passed along the network.
We have also included chapters concerning ways to sniff and troubleshoot network connections and how to implement strong authentication using One Time Passwords (OTP) and Kerberos.
Tools such as Squid proxy server and Ipchains/Iptables will help you use your Linux system so that it can act as a firewall.
The focus would be on profiling the most commonly used security tools found on the Linux platform.I will also try to emphasize the real-world implementation of these tools, as opposed to just providing conceptual overviews.
Finally, I have described the steps you should take when things go wrong. As a result, I have created a blog that is a valuable resource that helps you use your Linux system as efficiently as possible.
While writing the blog, I had the following three-part structure in mind:
- Locking Down the Network
- Securing Data Passing Across the Network
- Protecting the Network Perimeter with Firewalls
Each of these sections is designed to help you find the best solution for your particular situation.
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