# -*- coding: utf-8 -*-
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, requires_csrf_token
from django.core.context_processors import csrf
from django.contrib.sessions.middleware import SessionMiddleware
from django.utils.importlib import import_module
from django.conf import settings
from django.template import RequestContext, Template
# Response/views used for CsrfResponseMiddleware and CsrfViewMiddleware tests
def post_form_response():
resp = HttpResponse(content=u"""
<html><body><h1>\u00a1Unicode!<form method="post"><input type="text" /></form></body></html>
""", mimetype="text/html")
return resp
def post_form_response_non_html():
resp = post_form_response()
resp["Content-Type"] = "application/xml"
return resp
def post_form_view(request):
"""A view that returns a POST form (without a token)"""
return post_form_response()
# Response/views used for template tag tests
def _token_template():
return Template("{% csrf_token %}")
def _render_csrf_token_template(req):
context = RequestContext(req, processors=[csrf])
template = _token_template()
return template.render(context)
def token_view(request):
"""A view that uses {% csrf_token %}"""
return HttpResponse(_render_csrf_token_template(request))
def non_token_view_using_request_processor(request):
"""
A view that doesn't use the token, but does use the csrf view processor.
"""
context = RequestContext(request, processors=[csrf])
template = Template("")
return HttpResponse(template.render(context))
class TestingHttpRequest(HttpRequest):
"""
A version of HttpRequest that allows us to change some things
more easily
"""
def is_secure(self):
return getattr(self, '_is_secure', False)
class CsrfMiddlewareTest(TestCase):
# The csrf token is potentially from an untrusted source, so could have
# characters that need dealing with.
_csrf_id_cookie = "<1>\xc2\xa1"
_csrf_id = "1"
# This is a valid session token for this ID and secret key. This was generated using
# the old code that we're to be backwards-compatible with. Don't use the CSRF code
# to generate this hash, or we're merely testing the code against itself and not
# checking backwards-compatibility. This is also the output of (echo -n test1 | md5sum).
_session_token = "5a105e8b9d40e1329780d62ea2265d8a"
_session_id = "1"
_secret_key_for_session_test= "test"
def _get_GET_no_csrf_cookie_request(self):
return TestingHttpRequest()
def _get_GET_csrf_cookie_request(self):
req = TestingHttpRequest()
req.COOKIES[settings.CSRF_COOKIE_NAME] = self._csrf_id_cookie
return req
def _get_POST_csrf_cookie_request(self):
req = self._get_GET_csrf_cookie_request()
req.method = "POST"
return req
def _get_POST_no_csrf_cookie_request(self):
req = self._get_GET_no_csrf_cookie_request()
req.method = "POST"
return req
def _get_POST_request_with_token(self):
req = self._get_POST_csrf_cookie_request()
req.POST['csrfmiddlewaretoken'] = self._csrf_id
return req
def _get_POST_session_request_with_token(self):
req = self._get_POST_no_csrf_cookie_request()
req.COOKIES[settings.SESSION_COOKIE_NAME] = self._session_id
req.POST['csrfmiddlewaretoken'] = self._session_token
return req
def _get_POST_session_request_no_token(self):
req = self._get_POST_no_csrf_cookie_request()
req.COOKIES[settings.SESSION_COOKIE_NAME] = self._session_id
return req
def _check_token_present(self, response, csrf_id=None):
self.assertContains(response, "name='csrfmiddlewaretoken' value='%s'" % (csrf_id or self._csrf_id))
# Check the post processing and outgoing cookie
def test_process_response_no_csrf_cookie(self):
"""
When no prior CSRF cookie exists, check that the cookie is created and a
token is inserted.
"""
req = self._get_GET_no_csrf_cookie_request()
CsrfMiddleware().process_view(req, post_form_view, (), {})
resp = post_form_response()
resp_content = resp.content # needed because process_response modifies resp
resp2 = CsrfMiddleware().process_response(req, resp)
csrf_cookie = resp2.cookies.get(settings.CSRF_COOKIE_NAME, False)
self.assertNotEqual(csrf_cookie, False)
self.assertNotEqual(resp_content, resp2.content)
self._check_token_present(resp2, csrf_cookie.value)
# Check the Vary header got patched correctly
self.assert_('Cookie' in resp2.get('Vary',''))
def test_process_response_for_exempt_view(self):
"""
Check that a view decorated with 'csrf_view_exempt' is still
post-processed to add the CSRF token.
"""
req = self._get_GET_no_csrf_cookie_request()
CsrfMiddleware().process_view(req, csrf_view_exempt(post_form_view), (), {})
resp = post_form_response()
resp_content = resp.content # needed because process_response modifies resp
resp2 = CsrfMiddleware().process_response(req, resp)
csrf_cookie = resp2.cookies.get(settings.CSRF_COOKIE_NAME, False)
self.assertNotEqual(csrf_cookie, False)
self.assertNotEqual(resp_content, resp2.content)
self._check_token_present(resp2, csrf_cookie.value)
def test_process_response_no_csrf_cookie_view_only_get_token_used(self):
"""
When no prior CSRF cookie exists, check that the cookie is created, even
if only CsrfViewMiddleware is used.
"""
# This is checking that CsrfViewMiddleware has the cookie setting
# code. Most of the other tests use CsrfMiddleware.
req = self._get_GET_no_csrf_cookie_request()
# token_view calls get_token() indirectly
CsrfViewMiddleware().process_view(req, token_view, (), {})
resp = token_view(req)
resp2 = CsrfViewMiddleware().process_response(req, resp)
csrf_cookie = resp2.cookies.get(settings.CSRF_COOKIE_NAME, False)
self.assertNotEqual(csrf_cookie, False)
def test_process_response_get_token_not_used(self):
"""
Check that if get_token() is not called, the view middleware does not
add a cookie.
"""
# This is important to make pages cacheable. Pages which do call
# get_token(), assuming they use the token, are not cacheable because
# the token is specific to the user
req = self._get_GET_no_csrf_cookie_request()
# non_token_view_using_request_processor does not call get_token(), but
# does use the csrf request processor. By using this, we are testing
# that the view processor is properly lazy and doesn't call get_token()
# until needed.
CsrfViewMiddleware().process_view(req, non_token_view_using_request_processor, (), {})
resp = non_token_view_using_request_processor(req)
resp2 = CsrfViewMiddleware().process_response(req, resp)
csrf_cookie = resp2.cookies.get(settings.CSRF_COOKIE_NAME, False)
self.assertEqual(csrf_cookie, False)
def test_process_response_existing_csrf_cookie(self):
"""
Check that the token is inserted when a prior CSRF cookie exists
"""
req = self._get_GET_csrf_cookie_request()
CsrfMiddleware().process_view(req, post_form_view, (), {})
resp = post_form_response()
resp_content = resp.content # needed because process_response modifies resp
resp2 = CsrfMiddleware().process_response(req, resp)
self.assertNotEqual(resp_content, resp2.content)
self._check_token_present(resp2)
def test_process_response_non_html(self):
"""
Check the the post-processor does nothing for content-types not in _HTML_TYPES.
"""
req = self._get_GET_no_csrf_cookie_request()
CsrfMiddleware().process_view(req, post_form_view, (), {})
resp = post_form_response_non_html()
resp_content = resp.content # needed because process_response modifies resp
resp2 = CsrfMiddleware().process_response(req, resp)
self.assertEquals(resp_content, resp2.content)
def test_process_response_exempt_view(self):
"""
Check that no post processing is done for an exempt view
"""
req = self._get_GET_csrf_cookie_request()
view = csrf_exempt(post_form_view)
CsrfMiddleware().process_view(req, view, (), {})
resp = view(req)
resp_content = resp.content
resp2 = CsrfMiddleware().process_response(req, resp)
self.assertEquals(resp_content, resp2.content)
# Check the request processing
def test_process_request_no_session_no_csrf_cookie(self):
"""
Check that if neither a CSRF cookie nor a session cookie are present,
the middleware rejects the incoming request. This will stop login CSRF.
"""
req = self._get_POST_no_csrf_cookie_request()
req2 = CsrfMiddleware().process_view(req, post_form_view, (), {})
self.assertEquals(403, req2.status_code)
def test_process_request_csrf_cookie_no_token(self):
"""
Check that if a CSRF cookie is present but no token, the middleware
rejects the incoming request.
"""
req = self._get_POST_csrf_cookie_request()
req2 = CsrfMiddleware().process_view(req, post_form_view, (), {})
self.assertEquals(403, req2.status_code)
def test_process_request_csrf_cookie_and_token(self):
"""
Check that if both a cookie and a token is present, the middleware lets it through.
"""
req = self._get_POST_request_with_token()
req2 = CsrfMiddleware().process_view(req, post_form_view, (), {})
self.assertEquals(None, req2)
def test_process_request_session_cookie_no_csrf_cookie_token(self):
"""
When no CSRF cookie exists, but the user has a session, check that a token
using the session cookie as a legacy CSRF cookie is accepted.
"""
orig_secret_key = settings.SECRET_KEY
settings.SECRET_KEY = self._secret_key_for_session_test
try:
req = self._get_POST_session_request_with_token()
req2 = CsrfMiddleware().process_view(req, post_form_view, (), {})
self.assertEquals(None, req2)
finally:
settings.SECRET_KEY = orig_secret_key
def test_process_request_session_cookie_no_csrf_cookie_no_token(self):
"""
Check that if a session cookie is present but no token and no CSRF cookie,
the request is rejected.
"""
req = self._get_POST_session_request_no_token()
req2 = CsrfMiddleware().process_view(req, post_form_view, (), {})
self.assertEquals(403, req2.status_code)
def test_process_request_csrf_cookie_no_token_exempt_view(self):
"""
Check that if a CSRF cookie is present and no token, but the csrf_exempt
decorator has been applied to the view, the middleware lets it through
"""
req = self._get_POST_csrf_cookie_request()
req2 = CsrfMiddleware().process_view(req, csrf_exempt(post_form_view), (), {})
self.assertEquals(None, req2)
def test_ajax_exemption(self):
"""
Check that AJAX requests are automatically exempted.
"""
req = self._get_POST_csrf_cookie_request()
req.META['HTTP_X_REQUESTED_WITH'] = 'XMLHttpRequest'
req2 = CsrfMiddleware().process_view(req, post_form_view, (), {})
self.assertEquals(None, req2)
# Tests for the template tag method
def test_token_node_no_csrf_cookie(self):
"""
Check that CsrfTokenNode works when no CSRF cookie is set
"""
req = self._get_GET_no_csrf_cookie_request()
resp = token_view(req)
self.assertEquals(u"", resp.content)
def test_token_node_empty_csrf_cookie(self):
"""
Check that we get a new token if the csrf_cookie is the empty string
"""
req = self._get_GET_no_csrf_cookie_request()
req.COOKIES[settings.CSRF_COOKIE_NAME] = ""
CsrfViewMiddleware().process_view(req, token_view, (), {})
resp = token_view(req)
self.assertNotEqual(u"", resp.content)
def test_token_node_with_csrf_cookie(self):
"""
Check that CsrfTokenNode works when a CSRF cookie is set
"""
req = self._get_GET_csrf_cookie_request()
CsrfViewMiddleware().process_view(req, token_view, (), {})
resp = token_view(req)
self._check_token_present(resp)
def test_get_token_for_exempt_view(self):
"""
Check that get_token still works for a view decorated with 'csrf_view_exempt'.
"""
req = self._get_GET_csrf_cookie_request()
CsrfViewMiddleware().process_view(req, csrf_view_exempt(token_view), (), {})
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
the middleware (when one was not already present)
"""
req = self._get_GET_no_csrf_cookie_request()
CsrfViewMiddleware().process_view(req, token_view, (), {})
resp = token_view(req)
resp2 = CsrfViewMiddleware().process_response(req, resp)
csrf_cookie = resp2.cookies[settings.CSRF_COOKIE_NAME]
self._check_token_present(resp, csrf_id=csrf_cookie.value)
def test_response_middleware_without_view_middleware(self):
"""
Check that CsrfResponseMiddleware finishes without error if the view middleware
has not been called, as is the case if a request middleware returns a response.
"""
req = self._get_GET_no_csrf_cookie_request()
resp = post_form_view(req)
CsrfMiddleware().process_response(req, resp)
def test_https_bad_referer(self):
"""
Test that a POST HTTPS request with a bad referer is rejected
"""
req = self._get_POST_request_with_token()
req._is_secure = True
req.META['HTTP_HOST'] = 'www.example.com'
req.META['HTTP_REFERER'] = 'https://www.evil.org/somepage'
req2 = CsrfViewMiddleware().process_view(req, post_form_view, (), {})
self.assertNotEqual(None, req2)
self.assertEquals(403, req2.status_code)
def test_https_good_referer(self):
"""
Test that a POST HTTPS request with a good referer is accepted
"""
req = self._get_POST_request_with_token()
req._is_secure = True
req.META['HTTP_HOST'] = 'www.example.com'
req.META['HTTP_REFERER'] = 'https://www.example.com/somepage'
req2 = CsrfViewMiddleware().process_view(req, post_form_view, (), {})
self.assertEquals(None, req2)