Update mctpd-dbus.conf to open properties, introspection, and objects to unprivileged users, and full access to a special group

Signed-off-by: James Lee <james@codeconstruct.com.au>

Author: SafetyInObscurity

conf/mctpd-dbus.conf

@@ -2,9 +2,33 @@
 <!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
         "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
 <busconfig>
+ <policy context="default">
+  <deny send_destination="au.com.codeconstruct.MCTP1">
+
+  <allow receive_sender="au.com.codeconstruct.MCTP1"/>
+
+  <allow send_destination="au.com.codeconstruct.MCTP1"
+         send_interface="org.freedesktop.DBus.Propeties"
+         send_member="Get"/>
+
+  <allow send_destination="au.com.codeconstruct.MCTP1"
+         send_interface="org.freedesktop.DBus.Propeties"
+         send_member="GetAll"/>
+
+  <allow send_destination="au.com.codeconstruct.MCTP1"
+         send_interface="org.freedesktop.DBus.Introspectable"/>
+
+  <allow send_destination="au.com.codeconstruct.MCTP1"
+         send_interface="org.freedesktop.DBus.ObjectManager"/>
+ </policy>
  <policy user="mctpd">
   <allow own="au.com.codeconstruct.MCTP1"/>
+ </policy>
+ <policy group="mctp-admin">
+  <allow send_destination="au.com.codeconstruct.MCTP1"/>
+ </policy>
+ <policy user="root">
+  <allow own="au.com.codeconstruct.MCTP1"/>
   <allow send_destination="au.com.codeconstruct.MCTP1"/>
-  <allow receive_sender="au.com.codeconstruct.MCTP1"/>
  </policy>
 </busconfig>