/etc/dbus-1/system.d/com.canonical.Unity.Greeter.Broadcast.conf is in unity-greeter-session-broadcast 0.1+14.10.20140601-0ubuntu2.
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 | <!-- ../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>
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