django-session-csrf
is an alternative implementation of Django's CSRF protection that does not use cookies. Instead, it maintains the CSRF token on the server using Django's session backend. The csrf token must still be included in all POST requests (either with csrfmiddlewaretoken in the form or with the X-CSRFTOKEN header).
From PyPI:
pip install django-session-csrf
From github:
git clone git://github.com/mozilla/django-session-csrf.git
Replace django.core.context_processors.csrf
with session_csrf.context_processor
in your TEMPLATE_CONTEXT_PROCESSORS
:
TEMPLATE_CONTEXT_PROCESSORS = (
...
'session_csrf.context_processor',
...
)
Replace django.middleware.csrf.CsrfViewMiddleware
with session_csrf.CsrfMiddleware
in your MIDDLEWARE_CLASSES
and make sure it is listed after the AuthenticationMiddleware:
MIDDLEWARE_CLASSES = (
...
'django.contrib.auth.middleware.AuthenticationMiddleware',
...
'session_csrf.CsrfMiddleware',
...
)
Then we have to monkeypatch Django to fix the @csrf_protect
decorator:
import session_csrf
session_csrf.monkeypatch()
Make sure that's in something like your root urls.py
so the patch gets applied before your views are imported.
django-session-csrf
does not assign CSRF tokens to anonymous users because we don't want to support a session for every anonymous user. Instead, views that need anonymous forms can be decorated with @anonymous_csrf
:
from session_csrf import anonymous_csrf
@anonymous_csrf
def login(request):
...
anonymous_csrf
uses the cache to give anonymous users a lightweight session. It sends a cookie to uniquely identify the user and stores the CSRF token in the cache. It can be controlled through these settings:
ANON_COOKIE
the name used for the anonymous user's cookie
Default:
anoncsrf
ANON_TIMEOUT
the cache timeout (in seconds) to use for the anonymous CSRF tokens
Default:
60 * 60 * 2 # 2 hours
Note that by default Django uses local-memory caching, which will not work with anonymous CSRF if there is more than one web server thread. To use anonymous CSRF, you must configure a cache that's shared between web server instances, such as Memcached. See the Django cache documentation for more information.
If you only want a view to have CSRF protection for logged-in users, you can use the anonymous_csrf_exempt
decorator. This could be useful if the anonymous view is protected through a CAPTCHA, for example.
from session_csrf import anonymous_csrf_exempt
@anonymous_csrf_exempt
def protected_in_another_way(request):
...
If you want all views to have CSRF protection for anonymous users as Django does, use the following setting:
ANON_ALWAYS
always provide CSRF protection for anonymous users
Default: False
- Your site is on a subdomain with other sites that are not under your control, so cookies could come from anywhere.
- You're worried about attackers using Flash to forge HTTP headers.
- You're tired of requiring a Referer header.
- Storing tokens in sessions means you have to hit your session store more often.
- It's a little bit more work to CSRF-protect forms for anonymous users.