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Change semantic of OR of two permission classes

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The original semantic of OR is defined as: the request pass either of the two has_permission() check, and pass either of the two has_object_permission() check, which could lead to situations that a request passes has_permission() but fails on has_object_permission() of Permission Class A, fails has_permission() but passes has_object_permission() of Permission Class B, passes the OR permission check. This should not be the desired permission check semantic in applications, because such a request should fail on either Permission Class (on Django object permission) alone, but passes the OR or the two.

My code fix this by changing the semantic so that the request has to pass either class's has_permission() and has_object_permission() to get the Django object permission of the OR check.
This commit is contained in:
Mark Yu 2019-04-24 22:25:37 +08:00 committed by David Smith
parent 04f39c42ee
commit 2d4858af3b
2 changed files with 16 additions and 3 deletions
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4
rest_framework/permissions.py
View File

@ -78,8 +78,8 @@ class OR:
def has_object_permission(self, request, view, obj): def has_object_permission(self, request, view, obj):
return ( return (
self.op1.has_object_permission(request, view, obj) or (self.op1.has_permission(request, view) and self.op1.has_object_permission(request, view, obj)) or
self.op2.has_object_permission(request, view, obj) (self.op2.has_permission(request, view) and self.op2.has_object_permission(request, view, obj))
) )

15
tests/test_permissions.py
View File

@ -635,7 +635,7 @@ class PermissionsCompositionTests(TestCase):
composed_perm = (permissions.IsAuthenticated | permissions.AllowAny) composed_perm = (permissions.IsAuthenticated | permissions.AllowAny)
hasperm = composed_perm().has_object_permission(request, None, None) hasperm = composed_perm().has_object_permission(request, None, None)
assert hasperm is True assert hasperm is True
assert mock_deny.call_count == 1 assert mock_deny.call_count == 0
assert mock_allow.call_count == 1 assert mock_allow.call_count == 1
def test_and_lazyness(self): def test_and_lazyness(self):
@ -677,3 +677,16 @@ class PermissionsCompositionTests(TestCase):
assert hasperm is False assert hasperm is False
assert mock_deny.call_count == 1 assert mock_deny.call_count == 1
mock_allow.assert_not_called() mock_allow.assert_not_called()
def test_unimplemented_has_object_permission(self):
"test for issue 6402 https://github.com/encode/django-rest-framework/issues/6402"
request = factory.get('/1', format='json')
request.user = AnonymousUser()
class IsAuthenticatedUserOwner(permissions.IsAuthenticated):
def has_object_permission(self, request, view, obj):
return True
composed_perm = (IsAuthenticatedUserOwner | permissions.IsAdminUser)
hasperm = composed_perm().has_object_permission(request, None, None)
assert hasperm is False