/etc/dbus-1/system.d/powerd.conf is in powerd 0.16+16.04.20160204.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | <!-- This configuration file specifies the required security policies
for powerd daemon to work. -->
<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>
<!-- Only the root user can own the powerd name -->
<policy user="root">
<allow own="com.canonical.powerd"/>
</policy>
<!-- Permit the root user to invoke all of the methods on powerd,
and to get and set properties. -->
<policy user="root">
<allow send_destination="com.canonical.powerd"/>
<allow send_interface="com.canonical.powerd"/>
</policy>
<!-- Allow any user to introspect powerd's interfaces, to obtain the
values of properties and only set some of them (brightness). -->
<policy context="default">
<allow send_destination="com.canonical.powerd"
send_interface="org.freedesktop.DBus.Introspectable" />
<allow send_destination="com.canonical.powerd"
send_interface="org.freedesktop.DBus.Properties"
send_type="method_call" send_member="Get" />
<allow send_destination="com.canonical.powerd"
send_interface="org.freedesktop.DBus.Properties"
send_type="method_call" send_member="GetAll" />
<allow send_destination="com.canonical.powerd"
send_interface="com.canonical.powerd"
send_type="method_call" send_member="userAutobrightnessEnable" />
<allow send_destination="com.canonical.powerd"
send_interface="com.canonical.powerd"
send_type="method_call" send_member="getBrightnessParams" />
<allow send_destination="com.canonical.powerd"
send_interface="com.canonical.powerd"
send_type="method_call" send_member="setUserBrightness" />
<allow send_destination="com.canonical.powerd"
send_interface="com.canonical.powerd"
send_type="method_call" send_member="listSysRequests" />
<allow send_destination="com.canonical.powerd"
send_interface="com.canonical.powerd"
send_type="method_call" send_member="getSysRequestStats" />
<allow send_destination="com.canonical.powerd"
send_interface="com.canonical.powerd"
send_type="method_call" send_member="userAutobrightnessEnable" />
</policy>
<!-- Allow any user at console (adb shell) to send commands this is
needed for unlocking the screen in tests (LP: 1298869) -->
<policy at_console="true">
<allow send_destination="com.canonical.powerd"/>
</policy>
</busconfig>
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