nixos/soteria: init module

(cherry picked from commit 53712fa4a1)

nixos/modules/module-list.nix

@@ -362,6 +362,7 @@
   ./security/polkit.nix
   ./security/rngd.nix
   ./security/rtkit.nix
+  ./security/soteria.nix
   ./security/sudo.nix
   ./security/sudo-rs.nix
   ./security/systemd-confinement.nix

nixos/modules/security/soteria.nix

@@ -0,0 +1,50 @@
+{
+  lib,
+  pkgs,
+  config,
+  ...
+}:
+
+let
+  cfg = config.security.soteria;
+in
+{
+  options.security.soteria = {
+    enable = lib.mkEnableOption null // {
+      description = ''
+        Whether to enable Soteria, a Polkit authentication agent
+        for any desktop environment.
+
+        ::: {.note}
+        You should only enable this if you are on a Desktop Environment that
+        does not provide a graphical polkit authentication agent, or you are on
+        a standalone window manager or Wayland compositor.
+        :::
+      '';
+    };
+    package = lib.mkPackageOption pkgs "soteria" { };
+  };
+
+  config = lib.mkIf cfg.enable {
+    security.polkit.enable = true;
+    environment.systemPackages = [ cfg.package ];
+
+    systemd.user.services.polkit-soteria = {
+      description = "Soteria, Polkit authentication agent for any desktop environment";
+
+      wantedBy = [ "graphical-session.target" ];
+      wants = [ "graphical-session.target" ];
+      after = [ "graphical-session.target" ];
+
+      script = lib.getExe cfg.package;
+      serviceConfig = {
+        Type = "simple";
+        Restart = "on-failure";
+        RestartSec = 1;
+        TimeoutStopSec = 10;
+      };
+    };
+  };
+
+  meta.maintainers = with lib.maintainers; [ johnrtitor ];
+}