rootdir/etc/dbus.conf

<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN"
 "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>

  <!-- Our well-known bus type, do not change this -->
  <type>system</type>

  <!-- Only allow socket-credentials-based authentication -->
  <auth>EXTERNAL</auth>

  <!-- Only listen on a local socket. (abstract=/path/to/socket 
       means use abstract namespace, don't really create filesystem 
       file; only Linux supports this. Use path=/whatever on other 
       systems.) -->
  <listen>unix:path=/dev/socket/dbus</listen>

  <!-- Allow everything, D-Bus socket is protected by unix filesystem
       permissions -->
  <policy context="default">
    <allow send_interface="*"/>
    <allow receive_interface="*"/>
    <allow own="*"/>
    <allow user="*"/>
    <allow send_requested_reply="true"/>
    <allow receive_requested_reply="true"/>
  </policy>
</busconfig>