power: Add a backlight helper, as xbacklight isn't always present

This helper uses PolicyKit to do a one-time-authentication, which is not
required by default on an active session. This only works on Linux.

The PolicyKit helper has been moved from the gnome-power-manager project, and
was security reviewed by Vincent Untz.

1 files changed, 32 insertions, 0 deletions

diff --git a/plugins/power/org.gnome.settings-daemon.plugins.power.policy.in.in b/plugins/power/org.gnome.settings-daemon.plugins.power.policy.in.in
new file mode 100644
index 00000000..5adbc419
--- /dev/null
+++ b/plugins/power/org.gnome.settings-daemon.plugins.power.policy.in.in
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE policyconfig PUBLIC
+ "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN"
+ "http://www.freedesktop.org/standards/PolicyKit/1.0/policyconfig.dtd">
+<policyconfig>
+
+  <!--
+    Policy definitions for gnome-settings-daemon system-wide actions.
+    Copyright (c) 2010-2011 Richard Hughes <richard@hughsie.com>
+  -->
+
+  <vendor>GNOME Settings Daemon</vendor>
+  <vendor_url>http://git.gnome.org/browse/gnome-settings-daemon</vendor_url>
+  <icon_name>battery</icon_name>
+
+  <action id="org.gnome.settings-daemon.plugins.power.backlight-helper">
+    <!-- SECURITY:
+          - A normal active user on the local machine does not need permission
+            to change the backlight brightness.
+     -->
+    <_description>Modify the laptop brightness</_description>
+    <_message>Authentication is required to modify the laptop brightness</_message>
+    <defaults>
+      <allow_any>no</allow_any>
+      <allow_inactive>no</allow_inactive>
+      <allow_active>yes</allow_active>
+    </defaults>
+    <annotate key="org.freedesktop.policykit.exec.path">@libexecdir@/gsd-backlight-helper</annotate>
+  </action>
+
+</policyconfig>
+