Add dbus-network-manager-strict abstraction

Some applications queries network configuration (using QNetworkConfigurationManager class in Qt and similar), and that produces DBus denials under AppArmor confinement when NetworkManager backend is used.

Add abstraction that allows most common read-only DBus queries for getting current network configuration from NetworkManager backend.


PR: apparmor/apparmor!409


Acked-by: John Johansen <john.johansen@canonical.com>
(cherry picked from commit a10fa57f)
Signed-off-by: John Johansen <john.johansen@canonical.com>

profiles/apparmor.d/abstractions/dbus-network-manager-strict

+# vim:syntax=apparmor
+
+  dbus send
+       bus=system
+       path=/org/freedesktop/NetworkManager
+       interface=org.freedesktop.DBus.Properties
+       member=GetAll
+       peer=(name=org.freedesktop.NetworkManager),
+
+  dbus send
+       bus=system
+       path=/org/freedesktop/NetworkManager
+       interface=org.freedesktop.NetworkManager
+       member=GetDevices
+       peer=(name=org.freedesktop.NetworkManager),
+
+  dbus send
+       bus=system
+       path=/org/freedesktop/NetworkManager/ActiveConnection/[0-9]*
+       interface=org.freedesktop.DBus.Properties
+       member=GetAll
+       peer=(name=org.freedesktop.NetworkManager),
+
+  dbus send
+       bus=system
+       path=/org/freedesktop/NetworkManager/Devices/[0-9]*
+       interface=org.freedesktop.DBus.Properties
+       member=GetAll
+       peer=(name=org.freedesktop.NetworkManager),
+
+  dbus send
+       bus=system
+       path=/org/freedesktop/NetworkManager/Settings
+       interface=org.freedesktop.NetworkManager.Settings
+       member={GetDevices,ListConnections}
+       peer=(name=org.freedesktop.NetworkManager),
+
+  dbus send
+       bus=system
+       path=/org/freedesktop/NetworkManager/Settings/[0-9]*
+       interface=org.freedesktop.NetworkManager.Settings.Connection
+       member=GetSettings
+       peer=(name=org.freedesktop.NetworkManager),
+