wpa_supplicant: Permit the at_console user access to the

root properties of wpa_supplicant, so that they can set the debug
variables. The properties at this node are three debug variables
(writable) and lists of interfaces and EAP methods (read-only).

BUG=8984
TEST=Remove sudo from wpa_debug (separate CL) and run as chronos
user. Check for error, as opposed to a valid response.

Change-Id: I46479510b2b32be7eaa98ae860bdd8c4f91521e5

Review URL: http://codereview.chromium.org/4777002

wpa_supplicant/dbus/dbus-wpa_supplicant.conf

@@ -14,4 +14,9 @@
                 <deny send_interface="fi.w1.wpa_supplicant1"/>
                 <deny receive_sender="fi.w1.wpa_supplicant1" receive_type="signal"/>
         </policy>
+        <policy at_console="true">
+          <allow send_destination="fi.w1.wpa_supplicant1"
+                 send_interface="org.freedesktop.DBus.Properties"
+                 send_path="/fi/w1/wpa_supplicant1"/>
+        </policy>
 </busconfig>