As far as I understand from http://rip.journal-officiel.gouv.fr/index.php/pages/LO the laws themselves don't really have an author, but you are required to mention the source of the texts you reuse.

They are considered "public information", so no droit d'auteur. All government data considered as public information were published starting 2011 with an open data licence, the Etalab licence similar to the UK one.