141 lines
3.7 KiB
Nix
141 lines
3.7 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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let
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cfg = config.security.polkit;
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pkWrapper = pkgs.stdenv.mkDerivation {
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name = "polkit-wrapper";
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helper = "libexec/polkit-1/polkit-agent-helper-1";
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buildInputs = [ pkgs.xorg.lndir ];
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builder = pkgs.writeScript "pkwrap-builder" ''
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source $stdenv/setup
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mkdir -pv $out
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lndir ${pkgs.polkit} $out
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# !!! I'm pretty sure the wrapper doesn't work because
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# libpolkit-agent-1.so has a hard-coded reference to
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# polkit-agent-helper-1.
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rm $out/$helper
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ln -sv ${config.security.wrapperDir}/polkit-agent-helper-1 $out/$helper
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'';
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};
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in
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{
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options = {
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security.polkit.enable = mkOption {
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default = true;
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description = "Whether to enable PolKit.";
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};
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security.polkit.permissions = mkOption {
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default = "";
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example =
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''
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[Disallow Users To Suspend]
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Identity=unix-group:users
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Action=org.freedesktop.upower.*
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ResultAny=no
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ResultInactive=no
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ResultActive=no
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[Allow Anybody To Eject Disks]
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Identity=unix-user:*
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Action=org.freedesktop.udisks.drive-eject
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ResultAny=yes
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ResultInactive=yes
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ResultActive=yes
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[Allow Alice To Mount Filesystems After Admin Authentication]
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Identity=unix-user:alice
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Action=org.freedesktop.udisks.filesystem-mount
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ResultAny=auth_admin
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ResultInactive=auth_admin
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ResultActive=auth_admin
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'';
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description =
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''
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Allows the default permissions of privileged actions to be overriden.
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'';
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};
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security.polkit.adminIdentities = mkOption {
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default = "unix-user:0;unix-group:wheel";
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example = "";
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description =
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''
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Specifies which users are considered “administrators”, for those
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actions that require the user to authenticate as an
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administrator (i.e. have a <literal>auth_admin</literal>
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value). By default, this is the <literal>root</literal>
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user and all users in the <literal>wheel</literal> group.
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'';
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};
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};
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config = mkIf cfg.enable {
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environment.systemPackages = [ pkWrapper ];
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# The polkit daemon reads action files
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environment.pathsToLink = [ "/share/polkit-1/actions" ];
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environment.etc =
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[ # No idea what the "null backend" is, but it seems to need this.
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{ source = "${pkgs.polkit}/etc/polkit-1/nullbackend.conf.d";
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target = "polkit-1/nullbackend.conf.d";
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}
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# This file determines what users are considered
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# "administrators".
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{ source = pkgs.writeText "10-nixos.conf"
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''
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[Configuration]
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AdminIdentities=${cfg.adminIdentities}
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'';
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target = "polkit-1/localauthority.conf.d/10-nixos.conf";
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}
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{ source = pkgs.writeText "org.nixos.pkla" cfg.permissions;
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target = "polkit-1/localauthority/10-vendor.d/org.nixos.pkla";
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}
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];
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services.dbus.packages = [ pkWrapper ];
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security.pam.services = [ { name = "polkit-1"; } ];
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security.setuidPrograms = [ "pkexec" ];
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security.setuidOwners = singleton
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{ program = "polkit-agent-helper-1";
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owner = "root";
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group = "root";
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setuid = true;
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source = pkgs.polkit + "/" + pkWrapper.helper;
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};
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system.activationScripts.polkit =
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''
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mkdir -p /var/lib/polkit-1/localauthority
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chmod 700 /var/lib/polkit-1{/localauthority,}
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# Force polkitd to be restarted so that it reloads its
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# configuration.
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${pkgs.procps}/bin/pkill -INT -u root -x polkitd
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'';
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};
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}
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