Punkie

Also does anyone still port knock these days?

If they did, would we know?

Basic setup for me is scripted on a new system. In regards to ssh, I make sure:

• Root account is disabled, sudo only
• ssh only by keys
• sshd blocks all users but a few, via AllowUsers
• All ‘default usernames’ are removed, like ec2-user or ubuntu for AWS ec2 systems
• The default ssh port moved if ssh has to be exposed to the Internet. No, this doesn’t make it “more secure” but damn, it reduces the script denials in my system logs, fight me.
• Services are only allowed connections by an allow list of IPs or subnets. Internal, when possible.

My systems are not “unhackable” but not low-hanging fruit, either. I assume everything I have out there can be hacked by someone SUPER determined, and have a vector of protection to mitigate backwash in case they gain full access.