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337 lines
13 KiB
Python
337 lines
13 KiB
Python
# -*- coding: utf-8 -*-
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from __future__ import unicode_literals
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from django.conf import settings
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from django.core.context_processors import csrf
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from django.http import HttpRequest, HttpResponse
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from django.middleware.csrf import CsrfViewMiddleware, CSRF_KEY_LENGTH
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from django.template import RequestContext, Template
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from django.test import TestCase
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from django.views.decorators.csrf import csrf_exempt, requires_csrf_token, ensure_csrf_cookie
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# Response/views used for CsrfResponseMiddleware and CsrfViewMiddleware tests
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def post_form_response():
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resp = HttpResponse(content="""
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<html><body><h1>\u00a1Unicode!<form method="post"><input type="text" /></form></body></html>
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""", mimetype="text/html")
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return resp
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def post_form_view(request):
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"""A view that returns a POST form (without a token)"""
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return post_form_response()
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# Response/views used for template tag tests
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def token_view(request):
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"""A view that uses {% csrf_token %}"""
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context = RequestContext(request, processors=[csrf])
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template = Template("{% csrf_token %}")
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return HttpResponse(template.render(context))
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def non_token_view_using_request_processor(request):
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"""
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A view that doesn't use the token, but does use the csrf view processor.
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"""
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context = RequestContext(request, processors=[csrf])
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template = Template("")
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return HttpResponse(template.render(context))
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class TestingHttpRequest(HttpRequest):
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"""
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A version of HttpRequest that allows us to change some things
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more easily
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"""
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def is_secure(self):
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return getattr(self, '_is_secure_override', False)
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class CsrfViewMiddlewareTest(TestCase):
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# The csrf token is potentially from an untrusted source, so could have
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# characters that need dealing with.
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_csrf_id_cookie = b"<1>\xc2\xa1"
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_csrf_id = "1"
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def _get_GET_no_csrf_cookie_request(self):
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return TestingHttpRequest()
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def _get_GET_csrf_cookie_request(self):
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req = TestingHttpRequest()
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req.COOKIES[settings.CSRF_COOKIE_NAME] = self._csrf_id_cookie
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return req
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def _get_POST_csrf_cookie_request(self):
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req = self._get_GET_csrf_cookie_request()
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req.method = "POST"
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return req
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def _get_POST_no_csrf_cookie_request(self):
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req = self._get_GET_no_csrf_cookie_request()
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req.method = "POST"
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return req
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def _get_POST_request_with_token(self):
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req = self._get_POST_csrf_cookie_request()
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req.POST['csrfmiddlewaretoken'] = self._csrf_id
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return req
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def _check_token_present(self, response, csrf_id=None):
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self.assertContains(response, "name='csrfmiddlewaretoken' value='%s'" % (csrf_id or self._csrf_id))
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def test_process_view_token_too_long(self):
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"""
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Check that if the token is longer than expected, it is ignored and
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a new token is created.
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"""
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req = self._get_GET_no_csrf_cookie_request()
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req.COOKIES[settings.CSRF_COOKIE_NAME] = 'x' * 10000000
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CsrfViewMiddleware().process_view(req, token_view, (), {})
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resp = token_view(req)
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resp2 = CsrfViewMiddleware().process_response(req, resp)
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csrf_cookie = resp2.cookies.get(settings.CSRF_COOKIE_NAME, False)
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self.assertEqual(len(csrf_cookie.value), CSRF_KEY_LENGTH)
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def test_process_response_get_token_used(self):
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"""
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When get_token is used, check that the cookie is created and headers
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patched.
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"""
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req = self._get_GET_no_csrf_cookie_request()
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# Put tests for CSRF_COOKIE_* settings here
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with self.settings(CSRF_COOKIE_NAME='myname',
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CSRF_COOKIE_DOMAIN='.example.com',
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CSRF_COOKIE_PATH='/test/',
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CSRF_COOKIE_SECURE=True):
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# token_view calls get_token() indirectly
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CsrfViewMiddleware().process_view(req, token_view, (), {})
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resp = token_view(req)
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resp2 = CsrfViewMiddleware().process_response(req, resp)
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csrf_cookie = resp2.cookies.get('myname', False)
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self.assertNotEqual(csrf_cookie, False)
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self.assertEqual(csrf_cookie['domain'], '.example.com')
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self.assertEqual(csrf_cookie['secure'], True)
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self.assertEqual(csrf_cookie['path'], '/test/')
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self.assertTrue('Cookie' in resp2.get('Vary',''))
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def test_process_response_get_token_not_used(self):
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"""
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Check that if get_token() is not called, the view middleware does not
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add a cookie.
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"""
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# This is important to make pages cacheable. Pages which do call
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# get_token(), assuming they use the token, are not cacheable because
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# the token is specific to the user
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req = self._get_GET_no_csrf_cookie_request()
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# non_token_view_using_request_processor does not call get_token(), but
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# does use the csrf request processor. By using this, we are testing
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# that the view processor is properly lazy and doesn't call get_token()
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# until needed.
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CsrfViewMiddleware().process_view(req, non_token_view_using_request_processor, (), {})
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resp = non_token_view_using_request_processor(req)
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resp2 = CsrfViewMiddleware().process_response(req, resp)
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csrf_cookie = resp2.cookies.get(settings.CSRF_COOKIE_NAME, False)
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self.assertEqual(csrf_cookie, False)
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# Check the request processing
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def test_process_request_no_csrf_cookie(self):
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"""
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Check that if no CSRF cookies is present, the middleware rejects the
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incoming request. This will stop login CSRF.
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"""
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req = self._get_POST_no_csrf_cookie_request()
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req2 = CsrfViewMiddleware().process_view(req, post_form_view, (), {})
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self.assertEqual(403, req2.status_code)
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def test_process_request_csrf_cookie_no_token(self):
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"""
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Check that if a CSRF cookie is present but no token, the middleware
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rejects the incoming request.
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"""
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req = self._get_POST_csrf_cookie_request()
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req2 = CsrfViewMiddleware().process_view(req, post_form_view, (), {})
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self.assertEqual(403, req2.status_code)
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def test_process_request_csrf_cookie_and_token(self):
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"""
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Check that if both a cookie and a token is present, the middleware lets it through.
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"""
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req = self._get_POST_request_with_token()
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req2 = CsrfViewMiddleware().process_view(req, post_form_view, (), {})
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self.assertEqual(None, req2)
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def test_process_request_csrf_cookie_no_token_exempt_view(self):
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"""
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Check that if a CSRF cookie is present and no token, but the csrf_exempt
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decorator has been applied to the view, the middleware lets it through
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"""
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req = self._get_POST_csrf_cookie_request()
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req2 = CsrfViewMiddleware().process_view(req, csrf_exempt(post_form_view), (), {})
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self.assertEqual(None, req2)
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def test_csrf_token_in_header(self):
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"""
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Check that we can pass in the token in a header instead of in the form
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"""
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req = self._get_POST_csrf_cookie_request()
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req.META['HTTP_X_CSRFTOKEN'] = self._csrf_id
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req2 = CsrfViewMiddleware().process_view(req, post_form_view, (), {})
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self.assertEqual(None, req2)
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def test_put_and_delete_rejected(self):
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"""
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Tests that HTTP PUT and DELETE methods have protection
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"""
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req = TestingHttpRequest()
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req.method = 'PUT'
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req2 = CsrfViewMiddleware().process_view(req, post_form_view, (), {})
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self.assertEqual(403, req2.status_code)
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req = TestingHttpRequest()
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req.method = 'DELETE'
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req2 = CsrfViewMiddleware().process_view(req, post_form_view, (), {})
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self.assertEqual(403, req2.status_code)
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def test_put_and_delete_allowed(self):
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"""
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Tests that HTTP PUT and DELETE methods can get through with
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X-CSRFToken and a cookie
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"""
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req = self._get_GET_csrf_cookie_request()
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req.method = 'PUT'
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req.META['HTTP_X_CSRFTOKEN'] = self._csrf_id
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req2 = CsrfViewMiddleware().process_view(req, post_form_view, (), {})
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self.assertEqual(None, req2)
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req = self._get_GET_csrf_cookie_request()
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req.method = 'DELETE'
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req.META['HTTP_X_CSRFTOKEN'] = self._csrf_id
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req2 = CsrfViewMiddleware().process_view(req, post_form_view, (), {})
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self.assertEqual(None, req2)
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# Tests for the template tag method
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def test_token_node_no_csrf_cookie(self):
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"""
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Check that CsrfTokenNode works when no CSRF cookie is set
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"""
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req = self._get_GET_no_csrf_cookie_request()
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resp = token_view(req)
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self.assertEqual(resp.content, b'')
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def test_token_node_empty_csrf_cookie(self):
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"""
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Check that we get a new token if the csrf_cookie is the empty string
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"""
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req = self._get_GET_no_csrf_cookie_request()
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req.COOKIES[settings.CSRF_COOKIE_NAME] = b""
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CsrfViewMiddleware().process_view(req, token_view, (), {})
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resp = token_view(req)
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self.assertNotEqual("", resp.content)
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def test_token_node_with_csrf_cookie(self):
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"""
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Check that CsrfTokenNode works when a CSRF cookie is set
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"""
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req = self._get_GET_csrf_cookie_request()
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CsrfViewMiddleware().process_view(req, token_view, (), {})
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resp = token_view(req)
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self._check_token_present(resp)
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def test_get_token_for_exempt_view(self):
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"""
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Check that get_token still works for a view decorated with 'csrf_exempt'.
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"""
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req = self._get_GET_csrf_cookie_request()
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CsrfViewMiddleware().process_view(req, csrf_exempt(token_view), (), {})
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resp = token_view(req)
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self._check_token_present(resp)
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def test_get_token_for_requires_csrf_token_view(self):
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"""
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Check that get_token works for a view decorated solely with requires_csrf_token
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"""
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req = self._get_GET_csrf_cookie_request()
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resp = requires_csrf_token(token_view)(req)
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self._check_token_present(resp)
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def test_token_node_with_new_csrf_cookie(self):
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"""
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Check that CsrfTokenNode works when a CSRF cookie is created by
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the middleware (when one was not already present)
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"""
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req = self._get_GET_no_csrf_cookie_request()
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CsrfViewMiddleware().process_view(req, token_view, (), {})
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resp = token_view(req)
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resp2 = CsrfViewMiddleware().process_response(req, resp)
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csrf_cookie = resp2.cookies[settings.CSRF_COOKIE_NAME]
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self._check_token_present(resp, csrf_id=csrf_cookie.value)
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def test_https_bad_referer(self):
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"""
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Test that a POST HTTPS request with a bad referer is rejected
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"""
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req = self._get_POST_request_with_token()
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req._is_secure_override = True
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req.META['HTTP_HOST'] = 'www.example.com'
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req.META['HTTP_REFERER'] = 'https://www.evil.org/somepage'
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req2 = CsrfViewMiddleware().process_view(req, post_form_view, (), {})
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self.assertNotEqual(None, req2)
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self.assertEqual(403, req2.status_code)
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def test_https_good_referer(self):
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"""
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Test that a POST HTTPS request with a good referer is accepted
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"""
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req = self._get_POST_request_with_token()
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req._is_secure_override = True
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req.META['HTTP_HOST'] = 'www.example.com'
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req.META['HTTP_REFERER'] = 'https://www.example.com/somepage'
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req2 = CsrfViewMiddleware().process_view(req, post_form_view, (), {})
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self.assertEqual(None, req2)
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def test_https_good_referer_2(self):
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"""
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Test that a POST HTTPS request with a good referer is accepted
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where the referer contains no trailing slash
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"""
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# See ticket #15617
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req = self._get_POST_request_with_token()
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req._is_secure_override = True
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req.META['HTTP_HOST'] = 'www.example.com'
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req.META['HTTP_REFERER'] = 'https://www.example.com'
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req2 = CsrfViewMiddleware().process_view(req, post_form_view, (), {})
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self.assertEqual(None, req2)
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def test_ensures_csrf_cookie_no_middleware(self):
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"""
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Tests that ensures_csrf_cookie decorator fulfils its promise
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with no middleware
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"""
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@ensure_csrf_cookie
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def view(request):
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# Doesn't insert a token or anything
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return HttpResponse(content="")
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req = self._get_GET_no_csrf_cookie_request()
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resp = view(req)
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self.assertTrue(resp.cookies.get(settings.CSRF_COOKIE_NAME, False))
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self.assertTrue('Cookie' in resp.get('Vary',''))
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def test_ensures_csrf_cookie_with_middleware(self):
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"""
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Tests that ensures_csrf_cookie decorator fulfils its promise
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with the middleware enabled.
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"""
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@ensure_csrf_cookie
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def view(request):
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# Doesn't insert a token or anything
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return HttpResponse(content="")
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req = self._get_GET_no_csrf_cookie_request()
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CsrfViewMiddleware().process_view(req, view, (), {})
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resp = view(req)
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resp2 = CsrfViewMiddleware().process_response(req, resp)
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self.assertTrue(resp2.cookies.get(settings.CSRF_COOKIE_NAME, False))
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self.assertTrue('Cookie' in resp2.get('Vary',''))
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