Chapter 7. Troubleshooting Security Issues

In this chapter, we will discuss the issues related to the security of CentOS 7. However, instead of taking a traditional tour relating to hardening a server, we will take a more pragmatic approach by reviewing SSH, SELinux, HIDS, and Firewalld in an alternate fashion in order to encourage you to discover more about the system in general.

In this chapter, we will:

• Discover how to use aureport to generate audit reports and audit SELinux with setroubleshoot
• Learn how to add and manage SSH banners and use FIGlet to create custom banners
• Discover more about the rudiments of tuning the SSH service
• Learn how to install Tripwire and provide your system with an intrusion detection system
• Discover more about Firewalld, zone management, and how to add/remove interfaces, ports, and masquerade your infrastructure
• Learn how to remove Firewalld and return to iptables