Authentication and Permissions with Django REST framework

An overview of the authentication and permissions management with Django REST framework.

Transcript

1. Django REST framework Authentification Permissions Xavier Ordoquy
2. Mainteneur Django REST framework Freelance irc: linovia twitter: linovia_net
3. Django
4. DJANGO @login_required() def someview(request): ... ?
5. DJANGO MIDDLEWARE = [ "django...SessionMiddleware", "django...AuthenticationMiddleware", ] @login_required() def someview(request): ... !
6. Auth =/= Perm
7. Django REST framework
8. CLASSE VUE class ExampleView(APIView): authentication_classes = [SessionAuthentication] permission_classes = [IsAuthenticated]
9. FONCTION @api_view(['GET']) @authentication_classes([SessionAuthentication]) @permission_classes([IsAuthenticated]) def example_view(request, format=None): return Response({})
10. SETTINGS REST_FRAMEWORK = { 'DEFAULT_AUTHENTICATION_CLASSES': ( 'rest_framework.authentication.SessionAuthentication', ), 'DEFAULT_PERMISSION_CLASSES': ( 'rest_framework.permissions.IsAuthenticated', ) }
11. vue >> settings
12. Pourquoi ne pas réutiliser Django ?
13. DJANGO MIDDLEWARE = [ "django...SessionMiddleware", "django...AuthenticationMiddleware", ] @login_required() def someview(request): ...
14. Problème: authentifications différentes
15. Problème: trop lié à l’utilisateur
16. Problème: Middleware pour tout le site
17. SITE vs API { "count": 2, "next": null, "previous": null, "results": [ { "email": "admin@example.com", "groups": [], "url": "http://127.0.0.1:8000/users/1/", "username": "admin" }, { "email": "tom@example.com", "groups": [ ], "url": "http://127.0.0.1:8000/users/2/", "username": "tom" } ] }
18. Inclus: Basic
19. Inclus: Session
20. Inclus: Token
21. 3RD PARTIES • Django OAuth2 Consumer • JSON Web Token Authentication • Hawk HTTP Authentication • HTTP Signature Authentication • django-rest-framework-social-oauth2 • Digest
 Authentication • Djoser • django-rest-auth • django-rest-knox
22. 401 / 403
23. 403 Forbidden The request was successfully authenticated, but permission was denied.
24. 401 Unauthorized The request was not successfully authenticated, and the highest priority authentication class does use "WWW-Authenticate" headers
25. 403 Forbidden The request was not successfully authenticated, and the highest priority authentication class does not use "WWW-Authenticate" headers. > SessionAuthentication <
26. pas de header pas de 401 401 Unauthorized
27. CSRF
28. CSRF @csrf_exempt
29. CSRF Géré par SessionAuth…
30. PERMISSIONS
31. • AllowAny • IsAuthenticated • IsAdminUser • IsAuthenticatedOrReadOnly • DjangoModelPermissions • DjangoModelPermissionsOrAnonReadOnly • DjangoObjectPermissions INCLUS
32. DjangoModel Permissions Permissions par Model de django.contrib.auth
33. PERSONALISATION GET OPTIONS HEAD POST…………………….. PUT………………….. PATCH………………. DELETE……………….. <app label>.add_<model name> <app label>.change_<model name> <app label>.change_<model name> <app label>.delete_<model name> perms_map
34. DjangoObject Permissions Permissions par objet de django.contrib.auth (django-guardian ou autre)
35. PERMISSIONS PAR OBJET SUR LISTE ?
36. class CustomObjectPermissions(DjangoObjectPermissions): perms_map = { 'GET': ['%(app_label)s.view_%(model_name)s'], 'OPTIONS': ['%(app_label)s.view_%(model_name)s'], 'HEAD': ['%(app_label)s.view_%(model_name)s'], 'POST': ['%(app_label)s.add_%(model_name)s'], 'PUT': ['%(app_label)s.change_%(model_name)s'], 'PATCH': ['%(app_label)s.change_%(model_name)s'], 'DELETE': ['%(app_label)s.delete_%(model_name)s'], } class EventViewSet(viewsets.ModelViewSet): queryset = Event.objects.all() serializer_class = EventSerializer filter_backends = [filters.DjangoObjectPermissionsFilter] permission_classes = [CustomObjectPermissions]
37. WTF ?!? mes permissions sont appelées 6 x ?
38. COUPABLE
39. Pas de permissions sur mon get_object !!
40. SURCHAGE view.get_object def get_object(self): queryset = self.filter_queryset(self.get_queryset()) filter_kwargs = ### obj = get_object_or_404(queryset, **filter_kwargs) self.check_object_permissions(self.request, obj) return obj
41. CACHE GLOBAL (MIDDLEWARE) Pas de gestion de permissions
42. Permissions complexes ?
43. Et si j’avais besoin de lire la requête ?
44. from rest_framework.exceptions import PermissionDenied raise PermissionDenied( 'Some permission failed’ )
45. Ecrire son auth
46. from django.contrib.auth.models import User from rest_framework import authentication from rest_framework import exceptions class ExampleAuthentication(authentication.BaseAuthentication): def authenticate(self, request): username = request.META.get('X_USERNAME') if not username: return None try: user = User.objects.get(username=username) except User.DoesNotExist: raise exceptions.AuthenticationFailed('No such user') return (user, None)
47. Ecrire ses perms
48. from rest_framework import permissions class BlacklistPermission(permissions.BasePermission): def has_permission(self, request, view): ip_addr = request.META['REMOTE_ADDR'] blacklisted = Blacklist.objects.filter( ip_addr=ip_addr).exists() return not blacklisted
49. class IsOwnerOrReadOnly(permissions.BasePermission): def has_object_permission(self, request, view, obj): if request.method in permissions.SAFE_METHODS: return True return obj.owner == request.user
50. One more thing
51. Pérennité http://www.django-rest- framework.org/topics/funding/
52. As a direct result of a successful Mozilla grant application, I will be leaving my current role at DabApps, and attempting to secure a sustainable business model for REST framework development. I need your help in order to make this work. -Tom Christie
53. MERCI @linovia_net