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Fortify

Lets you run graphical applications as another user in a confined environment with a nice NixOS module to configure target users and provide launchers and desktop files for your privileged user.

Why would you want this?

It protects the desktop environment from applications.
It protects applications from each other.
It provides UID isolation on top of the standard application sandbox.

There are a few different things to set up for this to work:

A set of users, each for a group of applications that should be allowed access to each other
A tool to switch users, currently sudo and machinectl are supported.
If you are running NixOS, the module in this repository can take care of launchers and desktop files in the privileged user's environment, as well as packages and extra home-manager configuration for target users.

If you have a flakes-enabled nix environment, you can try out the tool by running:

nix run git+https://git.ophivana.moe/cat/fortify -- -h

Module usage

The NixOS module currently requires home-manager and impermanence to function correctly.

To use the module, import it into your configuration with

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";

    fortify = {
      url = "git+https://git.ophivana.moe/cat/fortify";

      # Optional but recommended to limit the size of your system closure.
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, fortify, ... }:
  {
    nixosConfigurations.fortify = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules = [
        fortify.nixosModules.fortify
      ];
    };
  };
}

This adds the environment.fortify option:

{ pkgs, ... }:

{
  environment.fortify = {
    enable = true;
    user = "nixos";
    stateDir = "/var/lib/persist/module";
    target = {
      chronos = {
        launchers = {
          weechat.method = "sudo";
          claws-mail.capability.pulse = false;

          discord = {
            command = "vesktop --ozone-platform-hint=wayland";
            share = pkgs.vesktop;
          };

          chromium.dbus = {
            configSystem = {
              filter = true;
              talk = [
                "org.bluez"
                "org.freedesktop.Avahi"
                "org.freedesktop.UPower"
              ];
            };
            config = {
              filter = true;
              talk = [
                "org.freedesktop.DBus"
                "org.freedesktop.FileManager1"
                "org.freedesktop.Notifications"
                "org.freedesktop.ScreenSaver"
                "org.freedesktop.secrets"
                "org.kde.kwalletd5"    
                "org.kde.kwalletd6"
              ];   
              own = [
                "org.chromium.Chromium.*"
                "org.mpris.MediaPlayer2.org.chromium.Chromium.*"
                "org.mpris.MediaPlayer2.chromium.*"
              ];
              call = {
                "org.freedesktop.portal.*" = "*";
              };
              broadcast = {
                "org.freedesktop.portal.*" = "@/org/freedesktop/portal/*";
              };
            };
          };
        };
        packages = with pkgs; [
          weechat
          claws-mail
          vesktop
          chromium
        ];
        persistence.directories = [
          ".config/weechat"
          ".claws-mail"
          ".config/vesktop"
        ];
        extraConfig = {
          programs.looking-glass-client.enable = true;
        };
      };
    };
  };
}

enable determines whether the module should be enabled or not. Useful when sharing configurations between graphical and headless systems. Defaults to false.
user specifies the privileged user with access to fortified applications.
stateDir is the path to your persistent storage location. It is directly passed through to the impermanence module.
target is an attribute set of submodules, where the attribute name is the username of the unprivileged target user.

The available options are:
- packages, the list of packages to make available in the target user's environment.
- persistence, user persistence attribute set passed to impermanence.
- extraConfig, extra home-manager configuration for the target user.
- launchers, attribute set where the attribute name is the name of the launcher.
  
  The available options are:
  - command, the command to run as the target user. Defaults to launcher name.
  - dbus.config, D-Bus proxy custom configuration.
  - dbus.configSystem, D-Bus system bus custom configuration, null to disable.
  - dbus.id, D-Bus application id, has no effect if dbus.config is set.
  - dbus.mpris, whether to enable MPRIS defaults, has no effect if dbus.config is set.
  - capability.wayland, whether to share the Wayland socket.
  - capability.x11, whether to share the X11 socket and allow connection.
  - capability.dbus, whether to proxy D-Bus.
  - capability.pulse, whether to share the PulseAudio socket and cookie.
  - share, package containing desktop/icon files. Defaults to launcher name.
  - method, the launch method for the sandboxed program, can be "fortify", "fortify-sudo", "sudo".

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Fortify

Module usage

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