org.kde.kcontrol.kcmkdm.conf

[andrzejl@icsserver ~]$ cat /usr/etc/dbus-1/system.d/org.kde.kcontrol.kcmkdm.conf
<!DOCTYPE busconfig PUBLIC
 "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
 "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>

  <!-- Only user root can own the foo helper -->
  <policy user="root">
    <allow own="org.kde.kcontrol.kcmkdm"/>
  </policy>

</busconfig>
[andrzejl@icsserver ~]$