NixOS-Config/modules/system/services/common/ssh/default.nix

{ ... }:
{
  imports = [ ./fail2ban ];

  services.openssh = {
    enable = true;
    settings = {
      PermitRootLogin = "no";
      PrintLastLog = "no";
      PasswordAuthentication = false;
      UsePAM = false;
    };
  };
}