update README document

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>
2024-09-04 19:53:35 +09:00 · 2024-09-04 19:53:35 +09:00 · 1b5fce5ccb
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+Fortify
+=======
+
+[![Go Reference](https://pkg.go.dev/badge/git.ophivana.moe/cat/fortify.svg)](https://pkg.go.dev/git.ophivana.moe/cat/fortify)
+
+Lets you run graphical applications as another user ~~in an Android-like sandbox environment~~ (WIP) 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~~ (WIP).
+
+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:
+
+```shell
+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
+
+```nix
+{
+  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:
+
+```nix
+{ pkgs, ... }:
+
+{
+  environment.fortify = {
+    enable = true;
+    user = "nixos";
+    shell = "zsh";
+    stateDir = "/var/lib/persist/module";
+    target = {
+      chronos = {
+        launchers = {
+          weechat.method = "sudo";
+          claws-mail.pulse = false;
+          discord = {
+            command = "vesktop --ozone-platform-hint=wayland";
+            share = pkgs.vesktop;
+          };
+        };
+        packages = with pkgs; [
+          weechat
+          claws-mail
+          vesktop
+        ];
+        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.
+
+* `shell` is the shell used to run the launch command, required for sourcing the home-manager environment.
+
+* `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.
+
+        * `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"`.