from django.http import HttpResponse from django.test import RequestFactory, SimpleTestCase from django.test.utils import override_settings class SecurityMiddlewareTest(SimpleTestCase): @property def middleware(self): from django.middleware.security import SecurityMiddleware return SecurityMiddleware() @property def secure_request_kwargs(self): return {"wsgi.url_scheme": "https"} def response(self, *args, **kwargs): headers = kwargs.pop("headers", {}) response = HttpResponse(*args, **kwargs) for k, v in headers.items(): response[k] = v return response def process_response(self, *args, **kwargs): request_kwargs = {} if kwargs.pop("secure", False): request_kwargs.update(self.secure_request_kwargs) request = (kwargs.pop("request", None) or self.request.get("/some/url", **request_kwargs)) ret = self.middleware.process_request(request) if ret: return ret return self.middleware.process_response( request, self.response(*args, **kwargs)) request = RequestFactory() def process_request(self, method, *args, **kwargs): if kwargs.pop("secure", False): kwargs.update(self.secure_request_kwargs) req = getattr(self.request, method.lower())(*args, **kwargs) return self.middleware.process_request(req) @override_settings(SECURE_HSTS_SECONDS=3600) def test_sts_on(self): """ With HSTS_SECONDS=3600, the middleware adds "strict-transport-security: max-age=3600" to the response. """ self.assertEqual( self.process_response(secure=True)["strict-transport-security"], "max-age=3600") @override_settings(SECURE_HSTS_SECONDS=3600) def test_sts_already_present(self): """ The middleware will not override a "strict-transport-security" header already present in the response. """ response = self.process_response( secure=True, headers={"strict-transport-security": "max-age=7200"}) self.assertEqual(response["strict-transport-security"], "max-age=7200") @override_settings(HSTS_SECONDS=3600) def test_sts_only_if_secure(self): """ The "strict-transport-security" header is not added to responses going over an insecure connection. """ self.assertNotIn("strict-transport-security", self.process_response(secure=False)) @override_settings(HSTS_SECONDS=0) def test_sts_off(self): """ With HSTS_SECONDS of 0, the middleware does not add a "strict-transport-security" header to the response. """ self.assertNotIn("strict-transport-security", self.process_response(secure=True)) @override_settings( SECURE_HSTS_SECONDS=600, SECURE_HSTS_INCLUDE_SUBDOMAINS=True) def test_sts_include_subdomains(self): """ With HSTS_SECONDS non-zero and HSTS_INCLUDE_SUBDOMAINS True, the middleware adds a "strict-transport-security" header with the "includeSubDomains" tag to the response. """ response = self.process_response(secure=True) self.assertEqual(response["strict-transport-security"], "max-age=600; includeSubDomains") @override_settings( SECURE_HSTS_SECONDS=600, SECURE_HSTS_INCLUDE_SUBDOMAINS=False) def test_sts_no_include_subdomains(self): """ With HSTS_SECONDS non-zero and HSTS_INCLUDE_SUBDOMAINS False, the middleware adds a "strict-transport-security" header without the "includeSubDomains" tag to the response. """ response = self.process_response(secure=True) self.assertEqual(response["strict-transport-security"], "max-age=600") @override_settings(SECURE_CONTENT_TYPE_NOSNIFF=True) def test_content_type_on(self): """ With CONTENT_TYPE_NOSNIFF set to True, the middleware adds "x-content-type-options: nosniff" header to the response. """ self.assertEqual(self.process_response()["x-content-type-options"], "nosniff") @override_settings(SECURE_CONTENT_TYPE_NOSNIFF=True) def test_content_type_already_present(self): """ The middleware will not override an "x-content-type-options" header already present in the response. """ response = self.process_response(secure=True, headers={"x-content-type-options": "foo"}) self.assertEqual(response["x-content-type-options"], "foo") @override_settings(SECURE_CONTENT_TYPE_NOSNIFF=False) def test_content_type_off(self): """ With CONTENT_TYPE_NOSNIFF False, the middleware does not add an "x-content-type-options" header to the response. """ self.assertNotIn("x-content-type-options", self.process_response()) @override_settings(SECURE_BROWSER_XSS_FILTER=True) def test_xss_filter_on(self): """ With BROWSER_XSS_FILTER set to True, the middleware adds "s-xss-protection: 1; mode=block" header to the response. """ self.assertEqual( self.process_response()["x-xss-protection"], "1; mode=block") @override_settings(SECURE_BROWSER_XSS_FILTER=True) def test_xss_filter_already_present(self): """ The middleware will not override an "x-xss-protection" header already present in the response. """ response = self.process_response(secure=True, headers={"x-xss-protection": "foo"}) self.assertEqual(response["x-xss-protection"], "foo") @override_settings(BROWSER_XSS_FILTER=False) def test_xss_filter_off(self): """ With BROWSER_XSS_FILTER set to False, the middleware does not add an "x-xss-protection" header to the response. """ self.assertNotIn("x-xss-protection", self.process_response()) @override_settings(SECURE_SSL_REDIRECT=True) def test_ssl_redirect_on(self): """ With SSL_REDIRECT True, the middleware redirects any non-secure requests to the https:// version of the same URL. """ ret = self.process_request("get", "/some/url?query=string") self.assertEqual(ret.status_code, 301) self.assertEqual( ret["Location"], "https://testserver/some/url?query=string") @override_settings(SECURE_SSL_REDIRECT=True) def test_no_redirect_ssl(self): """ The middleware does not redirect secure requests. """ ret = self.process_request("get", "/some/url", secure=True) self.assertIsNone(ret) @override_settings( SECURE_SSL_REDIRECT=True, SECURE_REDIRECT_EXEMPT=["^insecure/"]) def test_redirect_exempt(self): """ The middleware does not redirect requests with URL path matching an exempt pattern. """ ret = self.process_request("get", "/insecure/page") self.assertIsNone(ret) @override_settings( SECURE_SSL_REDIRECT=True, SECURE_SSL_HOST="secure.example.com") def test_redirect_ssl_host(self): """ The middleware redirects to SSL_HOST if given. """ ret = self.process_request("get", "/some/url") self.assertEqual(ret.status_code, 301) self.assertEqual(ret["Location"], "https://secure.example.com/some/url") @override_settings(SECURE_SSL_REDIRECT=False) def test_ssl_redirect_off(self): """ With SSL_REDIRECT False, the middleware does no redirect. """ ret = self.process_request("get", "/some/url") self.assertIsNone(ret)