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[1.2.X] Fixed #14565 - No csrf_token on 404 page.

This solution doesn't have the negative side-effects of [14356].

Backport of [14377] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14380 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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commit 36dd74446047570bd6bc1a8bdb8e2eaf3eb39a44 1 parent fcc283a
@spookylukey spookylukey authored
View
38 django/middleware/csrf.py
@@ -84,18 +84,22 @@ class CsrfViewMiddleware(object):
This middleware should be used in conjunction with the csrf_token template
tag.
"""
+ # The _accept and _reject methods currently only exist for the sake of the
+ # requires_csrf_token decorator.
+ def _accept(self, request):
+ # Avoid checking the request twice by adding a custom attribute to
+ # request. This will be relevant when both decorator and middleware
+ # are used.
+ request.csrf_processing_done = True
+ return None
+
+ def _reject(self, request, reason):
+ return _get_failure_view()(request, reason=reason)
+
def process_view(self, request, callback, callback_args, callback_kwargs):
if getattr(request, 'csrf_processing_done', False):
return None
- reject = lambda s: _get_failure_view()(request, reason=s)
- def accept():
- # Avoid checking the request twice by adding a custom attribute to
- # request. This will be relevant when both decorator and middleware
- # are used.
- request.csrf_processing_done = True
- return None
-
# If the user doesn't have a CSRF cookie, generate one and store it in the
# request, so it's available to the view. We'll store it in a cookie when
# we reach the response.
@@ -124,7 +128,7 @@ def accept():
# the creation of CSRF cookies, so that everything else continues to
# work exactly the same (e.g. cookies are sent etc), but before the
# any branches that call reject()
- return accept()
+ return self._accept(request)
if request.is_ajax():
# .is_ajax() is based on the presence of X-Requested-With. In
@@ -149,20 +153,20 @@ def accept():
# allowing the cross-domain POST request.
#
# So in all cases, it is safe to allow these requests through.
- return accept()
+ return self._accept(request)
if request.is_secure():
# Strict referer checking for HTTPS
referer = request.META.get('HTTP_REFERER')
if referer is None:
- return reject(REASON_NO_REFERER)
+ return self._reject(request, REASON_NO_REFERER)
# The following check ensures that the referer is HTTPS,
# the domains match and the ports match. This might be too strict.
good_referer = 'https://%s/' % request.get_host()
if not referer.startswith(good_referer):
- return reject(REASON_BAD_REFERER %
- (referer, good_referer))
+ return self._reject(request, REASON_BAD_REFERER %
+ (referer, good_referer))
# If the user didn't already have a CSRF cookie, then fall back to
# the Django 1.1 method (hash of session ID), so a request is not
@@ -176,7 +180,7 @@ def accept():
# No CSRF cookie and no session cookie. For POST requests,
# we insist on a CSRF cookie, and in this way we can avoid
# all CSRF attacks, including login CSRF.
- return reject(REASON_NO_COOKIE)
+ return self._reject(request, REASON_NO_COOKIE)
else:
csrf_token = request.META["CSRF_COOKIE"]
@@ -185,11 +189,11 @@ def accept():
if request_csrf_token != csrf_token:
if cookie_is_new:
# probably a problem setting the CSRF cookie
- return reject(REASON_NO_CSRF_COOKIE)
+ return self._reject(request, REASON_NO_CSRF_COOKIE)
else:
- return reject(REASON_BAD_TOKEN)
+ return self._reject(request, REASON_BAD_TOKEN)
- return accept()
+ return self._accept(request)
def process_response(self, request, response):
if getattr(response, 'csrf_processing_done', False):
View
16 django/views/decorators/csrf.py
@@ -14,6 +14,22 @@
using the decorator multiple times, is harmless and efficient.
"""
+
+class _EnsureCsrfToken(CsrfViewMiddleware):
+ # We need this to behave just like the CsrfViewMiddleware, but not reject
+ # requests.
+ def _reject(self, request, reason):
+ return None
+
+
+requires_csrf_token = decorator_from_middleware(_EnsureCsrfToken)
+requires_csrf_token.__name__ = 'requires_csrf_token'
+csrf_protect.__doc__ = """
+Use this decorator on views that need a correct csrf_token available to
+RequestContext, but without the CSRF protection that csrf_protect
+enforces.
+"""
+
def csrf_response_exempt(view_func):
"""
Modifies a view function so that its response is exempt
View
8 django/views/defaults.py
@@ -1,6 +1,11 @@
from django import http
+from django.views.decorators.csrf import requires_csrf_token
from django.template import Context, RequestContext, loader
+
+# This can be called when CsrfViewMiddleware.process_view has not run, therefore
+# need @requires_csrf_token in case the template needs {% csrf_token %}.
+@requires_csrf_token
def page_not_found(request, template_name='404.html'):
"""
Default 404 handler.
@@ -13,6 +18,8 @@ def page_not_found(request, template_name='404.html'):
t = loader.get_template(template_name) # You need to create a 404.html template.
return http.HttpResponseNotFound(t.render(RequestContext(request, {'request_path': request.path})))
+
+@requires_csrf_token
def server_error(request, template_name='500.html'):
"""
500 error handler.
@@ -23,6 +30,7 @@ def server_error(request, template_name='500.html'):
t = loader.get_template(template_name) # You need to create a 500.html template.
return http.HttpResponseServerError(t.render(Context({})))
+
def shortcut(request, content_type_id, object_id):
# TODO: Remove this in Django 2.0.
# This is a legacy view that depends on the contenttypes framework.
View
10 tests/regressiontests/csrf_tests/tests.py
@@ -3,7 +3,7 @@
from django.test import TestCase
from django.http import HttpRequest, HttpResponse
from django.middleware.csrf import CsrfMiddleware, CsrfViewMiddleware
-from django.views.decorators.csrf import csrf_exempt, csrf_view_exempt
+from django.views.decorators.csrf import csrf_exempt, csrf_view_exempt, requires_csrf_token
from django.core.context_processors import csrf
from django.contrib.sessions.middleware import SessionMiddleware
from django.utils.importlib import import_module
@@ -322,6 +322,14 @@ def test_get_token_for_exempt_view(self):
resp = token_view(req)
self._check_token_present(resp)
+ def test_get_token_for_requires_csrf_token_view(self):
+ """
+ Check that get_token works for a view decorated solely with requires_csrf_token
+ """
+ req = self._get_GET_csrf_cookie_request()
+ resp = requires_csrf_token(token_view)(req)
+ self._check_token_present(resp)
+
def test_token_node_with_new_csrf_cookie(self):
"""
Check that CsrfTokenNode works when a CSRF cookie is created by
View
17 tests/regressiontests/views/tests/defaults.py
@@ -9,6 +9,8 @@
class DefaultsTests(TestCase):
"""Test django views in django/views/defaults.py"""
fixtures = ['testdata.json']
+ non_existing_urls = ['/views/non_existing_url/', # this is in urls.py
+ '/views/other_non_existing_url/'] # this NOT in urls.py
def test_shortcut_with_absolute_url(self):
"Can view a shortcut for an Author object that has a get_absolute_url method"
@@ -49,12 +51,21 @@ def test_bad_content_type(self):
def test_page_not_found(self):
"A 404 status is returned by the page_not_found view"
- non_existing_urls = ['/views/non_existing_url/', # this is in urls.py
- '/views/other_non_existing_url/'] # this NOT in urls.py
- for url in non_existing_urls:
+ for url in self.non_existing_urls:
response = self.client.get(url)
self.assertEquals(response.status_code, 404)
+ def test_csrf_token_in_404(self):
+ """
+ The 404 page should have the csrf_token available in the context
+ """
+ # See ticket #14565
+ for url in self.non_existing_urls:
+ response = self.client.get(url)
+ csrf_token = response.context['csrf_token']
+ self.assertNotEqual(str(csrf_token), 'NOTPROVIDED')
+ self.assertNotEqual(str(csrf_token), '')
+
def test_server_error(self):
"The server_error view raises a 500 status"
response = self.client.get('/views/server_error/')
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