nixos-config/modules/system/vpn.nix

{
    config,
    lib,
    ...
}: {
    options.myConfig.vpn.lgs.enable = lib.mkEnableOption "";

    config = lib.mkIf config.myConfig.vpn.lgs.enable {
        sops.secrets = {
            "vpn/lgs/crt" = {};
            "vpn/lgs/key" = {};
        };

        services.openvpn.servers.lgs = {
            autoStart = false;

            config = ''
                dev tap
                persist-tun
                persist-key
                data-ciphers AES-128-GCM:AES-256-CBC
                data-ciphers-fallback AES-256-CBC
                auth SHA1
                tls-client
                client
                resolv-retry infinite
                remote 194.9.190.11 1194 udp4
                nobind
                auth-user-pass
                ca ${config.sops.secrets."vpn/lgs/crt".path}
                tls-auth ${config.sops.secrets."vpn/lgs/key".path} 1
                remote-cert-tls server
                explicit-exit-notify
            '';
        };
    };
}