385 lines
15 KiB
Python
385 lines
15 KiB
Python
# -*- coding: utf-8 -*-
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import warnings
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from django.test import TestCase
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from django.http import HttpRequest, HttpResponse
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from django.middleware.csrf import CsrfMiddleware, CsrfViewMiddleware
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from django.views.decorators.csrf import csrf_exempt, csrf_view_exempt, requires_csrf_token
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from django.core.context_processors import csrf
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from django.contrib.sessions.middleware import SessionMiddleware
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from django.utils.importlib import import_module
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from django.conf import settings
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from django.template import RequestContext, Template
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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=u"""
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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_response_non_html():
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resp = post_form_response()
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resp["Content-Type"] = "application/xml"
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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_template():
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return Template("{% csrf_token %}")
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def _render_csrf_token_template(req):
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context = RequestContext(req, processors=[csrf])
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template = _token_template()
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return template.render(context)
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def token_view(request):
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"""A view that uses {% csrf_token %}"""
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return HttpResponse(_render_csrf_token_template(request))
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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', False)
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class CsrfMiddlewareTest(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 = "<1>\xc2\xa1"
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_csrf_id = "1"
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# This is a valid session token for this ID and secret key. This was generated using
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# the old code that we're to be backwards-compatible with. Don't use the CSRF code
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# to generate this hash, or we're merely testing the code against itself and not
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# checking backwards-compatibility. This is also the output of (echo -n test1 | md5sum).
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_session_token = "5a105e8b9d40e1329780d62ea2265d8a"
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_session_id = "1"
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_secret_key_for_session_test= "test"
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def setUp(self):
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self.save_warnings_state()
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warnings.filterwarnings('ignore', category=DeprecationWarning,
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module='django.middleware.csrf')
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def tearDown(self):
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self.restore_warnings_state()
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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 _get_POST_session_request_with_token(self):
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req = self._get_POST_no_csrf_cookie_request()
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req.COOKIES[settings.SESSION_COOKIE_NAME] = self._session_id
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req.POST['csrfmiddlewaretoken'] = self._session_token
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return req
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def _get_POST_session_request_no_token(self):
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req = self._get_POST_no_csrf_cookie_request()
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req.COOKIES[settings.SESSION_COOKIE_NAME] = self._session_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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# Check the post processing and outgoing cookie
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def test_process_response_no_csrf_cookie(self):
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"""
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When no prior CSRF cookie exists, check that the cookie is created and a
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token is inserted.
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"""
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req = self._get_GET_no_csrf_cookie_request()
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CsrfMiddleware().process_view(req, post_form_view, (), {})
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resp = post_form_response()
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resp_content = resp.content # needed because process_response modifies resp
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resp2 = CsrfMiddleware().process_response(req, resp)
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csrf_cookie = resp2.cookies.get(settings.CSRF_COOKIE_NAME, False)
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self.assertNotEqual(csrf_cookie, False)
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self.assertNotEqual(resp_content, resp2.content)
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self._check_token_present(resp2, csrf_cookie.value)
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# Check the Vary header got patched correctly
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self.assertTrue('Cookie' in resp2.get('Vary',''))
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def test_process_response_for_exempt_view(self):
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"""
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Check that a view decorated with 'csrf_view_exempt' is still
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post-processed to add the CSRF token.
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"""
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req = self._get_GET_no_csrf_cookie_request()
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CsrfMiddleware().process_view(req, csrf_view_exempt(post_form_view), (), {})
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resp = post_form_response()
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resp_content = resp.content # needed because process_response modifies resp
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resp2 = CsrfMiddleware().process_response(req, resp)
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csrf_cookie = resp2.cookies.get(settings.CSRF_COOKIE_NAME, False)
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self.assertNotEqual(csrf_cookie, False)
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self.assertNotEqual(resp_content, resp2.content)
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self._check_token_present(resp2, csrf_cookie.value)
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def test_process_response_no_csrf_cookie_view_only_get_token_used(self):
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"""
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When no prior CSRF cookie exists, check that the cookie is created, even
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if only CsrfViewMiddleware is used.
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"""
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# This is checking that CsrfViewMiddleware has the cookie setting
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# code. Most of the other tests use CsrfMiddleware.
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req = self._get_GET_no_csrf_cookie_request()
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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(settings.CSRF_COOKIE_NAME, False)
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self.assertNotEqual(csrf_cookie, False)
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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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def test_process_response_existing_csrf_cookie(self):
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"""
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Check that the token is inserted when a prior CSRF cookie exists
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"""
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req = self._get_GET_csrf_cookie_request()
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CsrfMiddleware().process_view(req, post_form_view, (), {})
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resp = post_form_response()
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resp_content = resp.content # needed because process_response modifies resp
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resp2 = CsrfMiddleware().process_response(req, resp)
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self.assertNotEqual(resp_content, resp2.content)
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self._check_token_present(resp2)
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def test_process_response_non_html(self):
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"""
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Check the the post-processor does nothing for content-types not in _HTML_TYPES.
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"""
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req = self._get_GET_no_csrf_cookie_request()
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CsrfMiddleware().process_view(req, post_form_view, (), {})
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resp = post_form_response_non_html()
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resp_content = resp.content # needed because process_response modifies resp
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resp2 = CsrfMiddleware().process_response(req, resp)
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self.assertEqual(resp_content, resp2.content)
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def test_process_response_exempt_view(self):
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"""
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Check that no post processing is done for an exempt view
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"""
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req = self._get_GET_csrf_cookie_request()
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view = csrf_exempt(post_form_view)
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CsrfMiddleware().process_view(req, view, (), {})
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resp = view(req)
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resp_content = resp.content
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resp2 = CsrfMiddleware().process_response(req, resp)
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self.assertEqual(resp_content, resp2.content)
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# Check the request processing
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def test_process_request_no_session_no_csrf_cookie(self):
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"""
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Check that if neither a CSRF cookie nor a session cookie are present,
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the middleware rejects the 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 = CsrfMiddleware().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 = CsrfMiddleware().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 = CsrfMiddleware().process_view(req, post_form_view, (), {})
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self.assertEqual(None, req2)
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def test_process_request_session_cookie_no_csrf_cookie_token(self):
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"""
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When no CSRF cookie exists, but the user has a session, check that a token
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using the session cookie as a legacy CSRF cookie is accepted.
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"""
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orig_secret_key = settings.SECRET_KEY
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settings.SECRET_KEY = self._secret_key_for_session_test
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try:
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req = self._get_POST_session_request_with_token()
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req2 = CsrfMiddleware().process_view(req, post_form_view, (), {})
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self.assertEqual(None, req2)
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finally:
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settings.SECRET_KEY = orig_secret_key
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def test_process_request_session_cookie_no_csrf_cookie_no_token(self):
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"""
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Check that if a session cookie is present but no token and no CSRF cookie,
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the request is rejected.
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"""
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req = self._get_POST_session_request_no_token()
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req2 = CsrfMiddleware().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_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 = CsrfMiddleware().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 = CsrfMiddleware().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(u"", resp.content)
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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] = ""
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CsrfViewMiddleware().process_view(req, token_view, (), {})
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resp = token_view(req)
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self.assertNotEqual(u"", 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_view_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_view_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_response_middleware_without_view_middleware(self):
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"""
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Check that CsrfResponseMiddleware finishes without error if the view middleware
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has not been called, as is the case if a request middleware returns a response.
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"""
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req = self._get_GET_no_csrf_cookie_request()
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resp = post_form_view(req)
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CsrfMiddleware().process_response(req, resp)
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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 = 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 = 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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