Securing OpenSSH on CentOS and Red Hat

This guide provides comprehensive steps to secure your OpenSSH server on CentOS and Red Hat systems, focusing on best practices such as public key-only authentication for privileged accounts, firewall restrictions, and deploying a chroot environment.

Setting Up Public Key-Only Authentication

Using public key-only authentication enhances the security of SSH connections by requiring a cryptographic key pair, making it harder for attackers to gain access. To configure this:

Configuring the Firewall

Limiting access to the SSH server via firewall settings is crucial to prevent unauthorized access:

Deploying a Chroot Environment

Chroot confines the root directory for specific users to a particular directory, enhancing the security by isolating the filesystem:

Maintaining Security

Regular updates and monitoring are essential to maintain the security of your SSH server: