Paris-Auckland via Guangzhou/Baiyun

Hi,
I am flying from Paris to Auckland via Guangzhou. The transit is from 6 am to mid night on the same day.
So I would like to ask:
1) Do I need any specific type permit for the transit?
2) Can I leave the airport and come back later during the day to take the flight to Aucland?
I hold a Moroccan passport and have a visa for New Zealand (final stop).
Thank you.