Course

All About SSH

In this course, we will look at SSH usage and how to lock it down.

    Syllabus

  • TCP Wrappers Video — 00:10:31
    • Using TCP wrappers to further secure SSH.

  • What is ssh and why is it so important to Linux? Video — 00:12:57
    • A look at SSH server, SSH client, password vs. public/private key authorization and ssh-agent.

  • Hiding your SSH (or other daemons) with knockd Video — 00:11:08
    • How to set up port knocking to hide your daemons.

  • SSH is great, but how do we make it more secure? Video — 00:17:45
    • How to lock down SSH and SSH features. Explore allowing certain users, disallowing root, disallowing passwords, disallowing X forwarding and more.

Syllabus

Course description

SSH is the sysadmin’s best friend. We will look at some basics of SSH and how to use it to authenticate to remote servers, both with and without passwords. Securing SSH servers is very important, and we will review the various ways to lock down this critical service.

Meet the author

Jason Welsh started experimenting with Linux back in 1994 when it was still packaged on floppy disks. Over the years, he has run just about every flavor of Linux there is as well as a few years trying out FreeBSD.

He has been administering Solaris and Linux systems professionally since around 2003, supporting everything from Linux running on server hardware to storage to VPNs and firewalls. He‚Äôs always on the lookout for new and exciting things to try out in his home lab, which runs a Proxmox server. He’s tolerant of all Linux distributions, but the current favorite is Arch or Manjaro Linux.

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