I have a list of custom permissions in the Permission model, a User model and a Group model. I have different set of permissions(from the Permission model) defined for each group. Each user belongs to a particular group. I want to include a permission check in my website such that whenever a user logs in and tries to go to a view, the back-end checks if the user has the permission to enter the particular view. How to implement this in my website?
Note: I am not using django REST framework.
A user has all the permissions assigned to them directly as well as those assigned to any group that they are a member of.
To restrict access to a view based on Django permissions you can:
use the permission decorator:
https://docs.djangoproject.com/en/1.11/topics/auth/default/#the-permission-required-decorator
wrap the view function (e.g. in urls.py) with user_passes_test() with a test that checks for the permission: https://docs.djangoproject.com/en/1.11/topics/auth/default/#django.contrib.auth.decorators.user_passes_test
or check explicitly with user.has_perm() (same page as the above links, just read all of it)
Related
How can a user be a member of multiple organizations and have different roles in each organization, depending on what level of access they need.
Maybe you can try this build_user, you can use it as it comes by default or you can customize custom_user it so that you can accept a more specific authentication authentication_user, in addition to defining the user model or extending the permission control, you define it in the View by validating user permissions with (request .user.username), I hope it serves you, greetings.
If you have django.contrib.auth in your INSTALLED_APPS django will automatically create add, change, delete and view permissions to every model in your system (or any one you add later). These are stored in auth_permission.
In django doc, here is what we can read under Groups section:
django.contrib.auth.models.Group models are a generic way of categorizing users so you can apply permissions, or some other label, to those users. A user can belong to any number of groups.
A user in a group automatically has the permissions granted to that group. For example, if the group 'Site editors' has the permission can_edit_home_page, any user in that group will have that permission.
I've a group with no permission at all (call it NADA) and I've assign that group to a specific user (let's call him Pierre). Pierre can still connect and create, update, delete or view anything on my web interface.
How can I make it working? There's few or no doc on the web for native Django Permission.
I've read this nice publication
django-permission-apps-comparison.
I know I could install django-guardian, django-role-permissions or
django-rules...
I know we can manage access via middleware or decorator But since django IS creating these tables for us (user, groups, permissions and group_permissions)
I thought it was extremely simple to implement CRUD access to any model class!
Wrong?
Do I miss something?
Note: Working with Python3.6 and Django 2.1.3
Django permissions are simple. As far as I understand your question, you are trying to create a user with no permission and he should not see any entries on the Django admin.
First thing is to make sure the user is not marked as "superuser", the superuser sees everything no matter which group they are added in.
If he is not a superuser and is still able to see the model then you should make sure he is not part of multiple groups. If a user is in multiple groups then a union of all permissions is what is applied to them. This link will give you more details on different flags for a user https://djangobook.com/users-groups-permissions/. Let me know if this helps.
Django allows you to give users and groups of users custom permissions on objects (and django-guardian adds some nice ways of using this). There are various ways of putting users into hierarchies. What I'd like to do is add two types of hierarchies to the permissions themselves. For example if someone has a given permission on a Book object, I want them to implicitly have that permission on each Page object. Also, if someone has an change permission on a Page, I want them to implicitly have the view permission on that Page.
In sum, I want page.has_permission('view', user) to check both page.has_permission('*edit*', user) and page *.book* .has_permission('view', user), and for book.has_permission('view', user) to itself check book.has_permission('*edit*', user). (Asterisks just for emphasis.)
I don't need anything as complex as django-rules, and I prefer the generic foreign key approach as I will not have large numbers and it keeps the model structure clean and focused. I'd like to avoid repeating the logic for these permission relationships in views, or cluttering models, and I'd ideally keep this permission structure centralized somewhere, ideally declaratively. For example
perm_hierarchy = {'view': ['edit', 'delete', ]}
model_perm_hierarchy = { Page : [Chapter, ],
Chapter : [Book, ]}
Then a layer that when checking for 'view' on Page checks for 'edit' and 'delete' permissions on that Page object.
And similarly when checking Page for a permission, checks Chapter for the same permission (if that same named permission is defined for Chapter).
Very happy to be told I'm thinking about this wrong.
I document a solution using django-rules on top of django-guardian in this answer
Is it possible to conditionally register or unregister models in django admin?
I want some models to appear in django admin, only if request satisfies some conditions. In my specific case I only need to check if the logged in user belongs to a particular group, and not show the model if the user (even if superuser) is not in the group. I can not use permissions here because, superusers can not be ruled out using permissions.
Or, is there a way to revoke permission from even superusers on model.
Permissions on a model can be managed dynamically in ModelAdmin.
Override the methods has_add_permission, has_change_permission and has_delete_permission.
class MyModelAdmin(admin.ModelAdmin):
def has_add_permission(self,request):
# if request satisfies conditions:
# return True
#else:
# return False
Same goes for other two methods. This works for superusers also.
If you revoke all three permissions MyModel will not be listed on admin site.
If you only require to hide model entry from admin site, simply override
get_model_perms method. You don't have to override permission methods.
def get_model_perms(self, request):
return {}
However, this method does not revoke permissions from the model. Even if the model is not listed on admin site, it can be accessed by entering url.
I've tried a couple of approaches locally, including overriding an AdminSite, but given the fact that all admin-related code is loaded when the app is initialized, the simplest approach would be to rely on permissions (and not give everyone superuser access).
I will be creating an intranet site with multiple roles (client-employee, client-admin, staff team member). Each role will have a model that attaches (via One-to-One or ForeignKey field) to a user with custom fields. I want each role to have it's own set of permissions (like a group).
How can I store this permissions set inside my application. Groups seem to be defined as part of the contrib.admin app rather than in code. I couldn't find anything in documentation on how to define a group.
What is the best way to handle model level permissions. Maybe I could do a check in the model if see if the user has the right role-model.
Access control lists are tricky (some say dead), but Django comes with a good default implementation in contrib.auth equipped with:
Users
Permissions: Binary (yes/no) flags designating whether a user may perform a certain task.
Groups: A generic way of applying labels and permissions to more than one user.
A more detailed introduction can be found here:
http://parand.com/say/index.php/2010/02/19/django-using-the-permission-system/