nixos-config/services/openssh.nix

{
  services.openssh = {
    enable = true;
    allowSFTP = false;
    settings = {
      KbdInteractiveAuthentication = false;
      PasswordAuthentication = false;
      PermitEmptyPasswords = false;
      PermitRootLogin = "no";
      UseDns = false;
      X11Forwarding = false;
    };
  };
}