nixos/polkit: make pkexec opt-in

nixos/doc/manual/release-notes/rl-2611.section.md

@@ -28,6 +28,8 @@
 
 - Python 2 has been removed from the top-level package set, as it is long past end-of-life. The `python2`, `python27`, `python2Full`, `python27Full`, `python2Packages`, and `python27Packages` attributes, along with the legacy `python`, `pythonFull`, and `pythonPackages` aliases, now throw an error directing you to `python3`. The `isPy2` and `isPy27` package flags have been removed accordingly. The only remaining Python 2 interpreter is vendored inside the `resholve` package for its `oil` dependency and is not exposed for general use.
 
+- `security.polkit.enablePkexecWrapper` has been introduced, making the `pkexec` setuid wrapper opt-in.
+
 - `systemd.user.extraConfig` has been removed in favor of the structured [](#opt-systemd.user.settings.Manager) option. Use `systemd.user.settings.Manager` to set any `systemd-user.conf(5)` option directly. For example, replace `systemd.user.extraConfig = "DefaultTimeoutStartSec=60";` with `systemd.user.settings.Manager.DefaultTimeoutStartSec = 60;`.
 
 - `services.timesyncd.extraConfig` has been removed in favor of the structured [](#opt-services.timesyncd.settings.Time) option. Use `services.timesyncd.settings.Time` to set any `timesyncd.conf(5)` option directly. For example, replace `services.timesyncd.extraConfig = "PollIntervalMaxSec=180";` with `services.timesyncd.settings.Time.PollIntervalMaxSec = 180;`.

nixos/modules/security/polkit.nix

@@ -26,6 +26,7 @@ in
   options.security.polkit = {
     enable = mkEnableOption "polkit";
 
+    enablePkexecWrapper = mkEnableOption "the setuid pkexec wrapper";
 
     package = mkPackageOption pkgs "polkit" { };
 
@@ -157,6 +158,7 @@ in
     security.pam.services.polkit-1 = { };
 
     security.wrappers.pkexec = {
+      enable = cfg.enablePkexecWrapper;
       setuid = true;
       owner = "root";
       group = "root";