This file is indexed.

/etc/dbus-1/system.d/com.canonical.Unity.Greeter.Broadcast.conf is in unity-greeter-session-broadcast 0.1+14.04.20140324-0ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<!-- ../system.conf have denied everything, so we just punch some holes -->

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

  <policy user="root">
    <allow own="com.canonical.Unity.Greeter.Broadcast"/>
    <allow send_destination="com.canonical.Unity.Greeter.Broadcast"/>
  </policy>

  <policy user="lightdm">
    <allow send_destination="com.canonical.Unity.Greeter.Broadcast"/>
  </policy>

  <policy context="default">
    <allow send_destination="com.canonical.Unity.Greeter.Broadcast"
           send_interface="org.freedesktop.DBus.Introspectable"/>
  </policy>

</busconfig>