nixpkgs/nixos/tests/opensnitch.nix

import ./make-test-python.nix (
  { pkgs, ... }:
  {
    name = "opensnitch";

    meta = with pkgs.lib.maintainers; {
      maintainers = [ onny ];
    };

    nodes = {
      server =
        { ... }:
        {
          networking.firewall.allowedTCPPorts = [ 80 ];
          services.caddy = {
            enable = true;
            virtualHosts."localhost".extraConfig = ''
              respond "Hello, world!"
            '';
          };
        };

      clientBlocked =
        { ... }:
        {
          services.opensnitch = {
            enable = true;
            settings.DefaultAction = "deny";
          };
        };

      clientAllowed =
        { ... }:
        {
          services.opensnitch = {
            enable = true;
            settings.DefaultAction = "deny";
            rules = {
              curl = {
                name = "curl";
                enabled = true;
                action = "allow";
                duration = "always";
                operator = {
                  type = "simple";
                  sensitive = false;
                  operand = "process.path";
                  data = "${pkgs.curl}/bin/curl";
                };
              };
            };
          };
        };
    };

    testScript = ''
      start_all()
      server.wait_for_unit("caddy.service")
      server.wait_for_open_port(80)

      clientBlocked.wait_for_unit("opensnitchd.service")
      clientBlocked.fail("curl http://server")

      clientAllowed.wait_for_unit("opensnitchd.service")
      clientAllowed.succeed("curl http://server")
    '';
  }
)