OpenSSH security and hardening


Michael Boelen


After reading this article, you will know: Where the client settings and server settings are stored How to see the active and default settings How to test your configuration settings Make an informed decision on how to secure SSH Which tools can help audit SSH and apply best practices SSH basics SSH has two parts: the server daemon (sshd) that runs on a system and the client (ssh) used to connect to the server. PermitEmptyPasswords no If you see this option enabled, then check which user accounts have no password set. Use HashKnownHosts Each time the SSH client connects to a server, it will store a related signature (a key) of the server. Instead, we will have a look at the OpenSSH client tool. Instead of testing on the host itself, it can connect to an SSH server via the network.


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