Had a quick search in french Yahoo
Wild camp-site has never been prohibited in France, but on the other hand it is regulated. It is prohibited to camp: -
in woods, forests and national parks, -
on the roads and public highways, -
on the shores of the sea,
in a radius of 200 m around a water point collected for consumption. -
in a classified site or registered voter in the zones of protection of the inheritance of nature and the sites, -
with less than 500 m of a classified or registered historic building, -
in certain zones determined by the municipal or prefectoral authorities.
Used google to translate...don't blame me
As to fires
Don't risk it is probably the thing to do.