#20218: Default authorization backend returns False when queried for object
level
permissions
------------------------------+------------------------------------
Reporter: soren@… | Owner: nobody
Type: Bug | Status: new
Component: contrib.auth | Version: 1.5
Severity: Normal | Resolution:
Keywords: auth | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
------------------------------+------------------------------------
Comment (by Jamie Bliss):
Replying to [ticket:20218 soren@…]:
> Ticket #12462 suggests this is intentional, but doesn't give much of a
rationale. It seems to me that if you don't want a user to be able to edit
all objects of type XXX, don't give them the "app.change_XXX"?
I think the rationale is that the current behavior handles the general
permissions case (no object) while still falling through and allowing
another provider to handle the object-specific case.
The snippet to I used to work around this.
{{{#!python
class UseGeneralPermissions:
"""
Permissions provider that does object-level permissions by using
general permissions.
"""
def has_perm(self, user_obj, perm, obj=None):
if obj is None:
return False
else:
# Retry using general permissions
return user_obj.has_perm(perm)
}}}
As to how general and object-level permissions interact? That is
completely unspecified, and there isn't a clear answer how it should be.
1. A general given overrides an object-level ungiven, 2. A general ungiven
overrides an object-level given. 1 still allows efficient bulk operations
but UIs must check permissions on each object to know to display actions.
2 allows UIs to display actions optimistically, but can prevent efficient
bulk operations.
--
Ticket URL: <https://code.djangoproject.com/ticket/20218#comment:7>
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