{ lib, pkgs, ... }:
{
  environment.systemPackages = with pkgs; [
      yubioath-flutter # gui
      yubikey-manager  # `ykman`
      pam_u2f          # yubikey with sudo
  ];

  services.pcscd.enable = true;
  services.udev.packages = [ pkgs.yubikey-personalization ];

  services.yubikey-agent.enable = true;

  security.pam = {
    sshAgentAuth.enable = true;
    u2f = {
      enable = true;
      settings = {
        cue = true;
        authFile = "/home/max/.config/Yubico/u2f_keys";
      };
    };
    services = {
      login.u2fAuth = true;
      sudo = {
        u2fAuth = true;
        sshAgentAuth = true;
      };
    };

  };
}