{
  # Enable the OpenSSH daemon.
  services.openssh = {
    enable = true;
    ports = [ 22 ];
    settings = {
      PasswordAuthentication = true;
      AllowUsers = [ "freenen" ];
      UseDns = true;
      X11Forwarding = false;
      PermitRootLogin = "no";
    };
  };

  # Open ports in the firewall.
  # networking.firewall.allowedTCPPorts = [ 22 ];
  # networking.firewall.allowedUDPPorts = [ ... ];
  # Or disable the firewall altogether.
  # networking.firewall.enable = false;
}