import base64 import os import email import urllib.parse import urllib.request import http.server import threading import unittest import hashlib from test import support from test.support import hashlib_helper try: import ssl except ImportError: ssl = None here = os.path.dirname(__file__) # Self-signed cert file for 'localhost' CERT_localhost = os.path.join(here, 'keycert.pem') # Self-signed cert file for 'fakehostname' CERT_fakehostname = os.path.join(here, 'keycert2.pem') # Loopback http server infrastructure class LoopbackHttpServer(http.server.HTTPServer): """HTTP server w/ a few modifications that make it useful for loopback testing purposes. """ def __init__(self, server_address, RequestHandlerClass): http.server.HTTPServer.__init__(self, server_address, RequestHandlerClass) # Set the timeout of our listening socket really low so # that we can stop the server easily. self.socket.settimeout(0.1) def get_request(self): """HTTPServer method, overridden.""" request, client_address = self.socket.accept() # It's a loopback connection, so setting the timeout # really low shouldn't affect anything, but should make # deadlocks less likely to occur. request.settimeout(10.0) return (request, client_address) class LoopbackHttpServerThread(threading.Thread): """Stoppable thread that runs a loopback http server.""" def __init__(self, request_handler): threading.Thread.__init__(self) self._stop_server = False self.ready = threading.Event() request_handler.protocol_version = "HTTP/1.0" self.httpd = LoopbackHttpServer(("127.0.0.1", 0), request_handler) self.port = self.httpd.server_port def stop(self): """Stops the webserver if it's currently running.""" self._stop_server = True self.join() self.httpd.server_close() def run(self): self.ready.set() while not self._stop_server: self.httpd.handle_request() # Authentication infrastructure class DigestAuthHandler: """Handler for performing digest authentication.""" def __init__(self): self._request_num = 0 self._nonces = [] self._users = {} self._realm_name = "Test Realm" self._qop = "auth" def set_qop(self, qop): self._qop = qop def set_users(self, users): assert isinstance(users, dict) self._users = users def set_realm(self, realm): self._realm_name = realm def _generate_nonce(self): self._request_num += 1 nonce = hashlib.md5(str(self._request_num).encode("ascii")).hexdigest() self._nonces.append(nonce) return nonce def _create_auth_dict(self, auth_str): first_space_index = auth_str.find(" ") auth_str = auth_str[first_space_index+1:] parts = auth_str.split(",") auth_dict = {} for part in parts: name, value = part.split("=") name = name.strip() if value[0] == '"' and value[-1] == '"': value = value[1:-1] else: value = value.strip() auth_dict[name] = value return auth_dict def _validate_auth(self, auth_dict, password, method, uri): final_dict = {} final_dict.update(auth_dict) final_dict["password"] = password final_dict["method"] = method final_dict["uri"] = uri HA1_str = "%(username)s:%(realm)s:%(password)s" % final_dict HA1 = hashlib.md5(HA1_str.encode("ascii")).hexdigest() HA2_str = "%(method)s:%(uri)s" % final_dict HA2 = hashlib.md5(HA2_str.encode("ascii")).hexdigest() final_dict["HA1"] = HA1 final_dict["HA2"] = HA2 response_str = "%(HA1)s:%(nonce)s:%(nc)s:" \ "%(cnonce)s:%(qop)s:%(HA2)s" % final_dict response = hashlib.md5(response_str.encode("ascii")).hexdigest() return response == auth_dict["response"] def _return_auth_challenge(self, request_handler): request_handler.send_response(407, "Proxy Authentication Required") request_handler.send_header("Content-Type", "text/html") request_handler.send_header( 'Proxy-Authenticate', 'Digest realm="%s", ' 'qop="%s",' 'nonce="%s", ' % \ (self._realm_name, self._qop, self._generate_nonce())) # XXX: Not sure if we're supposed to add this next header or # not. #request_handler.send_header('Connection', 'close') request_handler.end_headers() request_handler.wfile.write(b"Proxy Authentication Required.") return False def handle_request(self, request_handler): """Performs digest authentication on the given HTTP request handler. Returns True if authentication was successful, False otherwise. If no users have been set, then digest auth is effectively disabled and this method will always return True. """ if len(self._users) == 0: return True if "Proxy-Authorization" not in request_handler.headers: return self._return_auth_challenge(request_handler) else: auth_dict = self._create_auth_dict( request_handler.headers["Proxy-Authorization"] ) if auth_dict["username"] in self._users: password = self._users[ auth_dict["username"] ] else: return self._return_auth_challenge(request_handler) if not auth_dict.get("nonce") in self._nonces: return self._return_auth_challenge(request_handler) else: self._nonces.remove(auth_dict["nonce"]) auth_validated = False # MSIE uses short_path in its validation, but Python's # urllib.request uses the full path, so we're going to see if # either of them works here. for path in [request_handler.path, request_handler.short_path]: if self._validate_auth(auth_dict, password, request_handler.command, path): auth_validated = True if not auth_validated: return self._return_auth_challenge(request_handler) return True class BasicAuthHandler(http.server.BaseHTTPRequestHandler): """Handler for performing basic authentication.""" # Server side values USER = 'testUser' PASSWD = 'testPass' REALM = 'Test' USER_PASSWD = "%s:%s" % (USER, PASSWD) ENCODED_AUTH = base64.b64encode(USER_PASSWD.encode('ascii')).decode('ascii') def __init__(self, *args, **kwargs): http.server.BaseHTTPRequestHandler.__init__(self, *args, **kwargs) def log_message(self, format, *args): # Suppress console log message pass def do_HEAD(self): self.send_response(200) self.send_header("Content-type", "text/html") self.end_headers() def do_AUTHHEAD(self): self.send_response(401) self.send_header("WWW-Authenticate", "Basic realm=\"%s\"" % self.REALM) self.send_header("Content-type", "text/html") self.end_headers() def do_GET(self): if not self.headers.get("Authorization", ""): self.do_AUTHHEAD() self.wfile.write(b"No Auth header received") elif self.headers.get( "Authorization", "") == "Basic " + self.ENCODED_AUTH: self.send_response(200) self.end_headers() self.wfile.write(b"It works") else: # Request Unauthorized self.do_AUTHHEAD() # Proxy test infrastructure class FakeProxyHandler(http.server.BaseHTTPRequestHandler): """This is a 'fake proxy' that makes it look like the entire internet has gone down due to a sudden zombie invasion. It main utility is in providing us with authentication support for testing. """ def __init__(self, digest_auth_handler, *args, **kwargs): # This has to be set before calling our parent's __init__(), which will # try to call do_GET(). self.digest_auth_handler = digest_auth_handler http.server.BaseHTTPRequestHandler.__init__(self, *args, **kwargs) def log_message(self, format, *args): # Uncomment the next line for debugging. # sys.stderr.write(format % args) pass def do_GET(self): (scm, netloc, path, params, query, fragment) = urllib.parse.urlparse( self.path, "http") self.short_path = path if self.digest_auth_handler.handle_request(self): self.send_response(200, "OK") self.send_header("Content-Type", "text/html") self.end_headers() self.wfile.write(bytes("You've reached %s!
" % self.path, "ascii")) self.wfile.write(b"Our apologies, but our server is down due to " b"a sudden zombie invasion.") # Test cases class BasicAuthTests(unittest.TestCase): USER = "testUser" PASSWD = "testPass" INCORRECT_PASSWD = "Incorrect" REALM = "Test" def setUp(self): super(BasicAuthTests, self).setUp() # With Basic Authentication def http_server_with_basic_auth_handler(*args, **kwargs): return BasicAuthHandler(*args, **kwargs) self.server = LoopbackHttpServerThread(http_server_with_basic_auth_handler) self.addCleanup(self.stop_server) self.server_url = 'http://127.0.0.1:%s' % self.server.port self.server.start() self.server.ready.wait() def stop_server(self): self.server.stop() self.server = None def tearDown(self): super(BasicAuthTests, self).tearDown() def test_basic_auth_success(self): ah = urllib.request.HTTPBasicAuthHandler() ah.add_password(self.REALM, self.server_url, self.USER, self.PASSWD) urllib.request.install_opener(urllib.request.build_opener(ah)) try: self.assertTrue(urllib.request.urlopen(self.server_url)) except urllib.error.HTTPError: self.fail("Basic auth failed for the url: %s" % self.server_url) def test_basic_auth_httperror(self): ah = urllib.request.HTTPBasicAuthHandler() ah.add_password(self.REALM, self.server_url, self.USER, self.INCORRECT_PASSWD) urllib.request.install_opener(urllib.request.build_opener(ah)) self.assertRaises(urllib.error.HTTPError, urllib.request.urlopen, self.server_url) class ProxyAuthTests(unittest.TestCase): URL = "http://localhost" USER = "tester" PASSWD = "test123" REALM = "TestRealm" @hashlib_helper.requires_hashdigest("md5") def setUp(self): super(ProxyAuthTests, self).setUp() # Ignore proxy bypass settings in the environment. def restore_environ(old_environ): os.environ.clear() os.environ.update(old_environ) self.addCleanup(restore_environ, os.environ.copy()) os.environ['NO_PROXY'] = '' os.environ['no_proxy'] = '' self.digest_auth_handler = DigestAuthHandler() self.digest_auth_handler.set_users({self.USER: self.PASSWD}) self.digest_auth_handler.set_realm(self.REALM) # With Digest Authentication. def create_fake_proxy_handler(*args, **kwargs): return FakeProxyHandler(self.digest_auth_handler, *args, **kwargs) self.server = LoopbackHttpServerThread(create_fake_proxy_handler) self.addCleanup(self.stop_server) self.server.start() self.server.ready.wait() proxy_url = "http://127.0.0.1:%d" % self.server.port handler = urllib.request.ProxyHandler({"http" : proxy_url}) self.proxy_digest_handler = urllib.request.ProxyDigestAuthHandler() self.opener = urllib.request.build_opener( handler, self.proxy_digest_handler) def stop_server(self): self.server.stop() self.server = None def test_proxy_with_bad_password_raises_httperror(self): self.proxy_digest_handler.add_password(self.REALM, self.URL, self.USER, self.PASSWD+"bad") self.digest_auth_handler.set_qop("auth") self.assertRaises(urllib.error.HTTPError, self.opener.open, self.URL) def test_proxy_with_no_password_raises_httperror(self): self.digest_auth_handler.set_qop("auth") self.assertRaises(urllib.error.HTTPError, self.opener.open, self.URL) def test_proxy_qop_auth_works(self): self.proxy_digest_handler.add_password(self.REALM, self.URL, self.USER, self.PASSWD) self.digest_auth_handler.set_qop("auth") with self.opener.open(self.URL) as result: while result.read(): pass def test_proxy_qop_auth_int_works_or_throws_urlerror(self): self.proxy_digest_handler.add_password(self.REALM, self.URL, self.USER, self.PASSWD) self.digest_auth_handler.set_qop("auth-int") try: result = self.opener.open(self.URL) except urllib.error.URLError: # It's okay if we don't support auth-int, but we certainly # shouldn't receive any kind of exception here other than # a URLError. pass else: with result: while result.read(): pass def GetRequestHandler(responses): class FakeHTTPRequestHandler(http.server.BaseHTTPRequestHandler): server_version = "TestHTTP/" requests = [] headers_received = [] port = 80 def do_GET(self): body = self.send_head() while body: done = self.wfile.write(body) body = body[done:] def do_POST(self): content_length = self.headers["Content-Length"] post_data = self.rfile.read(int(content_length)) self.do_GET() self.requests.append(post_data) def send_head(self): FakeHTTPRequestHandler.headers_received = self.headers self.requests.append(self.path) response_code, headers, body = responses.pop(0) self.send_response(response_code) for (header, value) in headers: self.send_header(header, value % {'port':self.port}) if body: self.send_header("Content-type", "text/plain") self.end_headers() return body self.end_headers() def log_message(self, *args): pass return FakeHTTPRequestHandler class TestUrlopen(unittest.TestCase): """Tests urllib.request.urlopen using the network. These tests are not exhaustive. Assuming that testing using files does a good job overall of some of the basic interface features. There are no tests exercising the optional 'data' and 'proxies' arguments. No tests for transparent redirection have been written. """ def setUp(self): super(TestUrlopen, self).setUp() # clear _opener global variable self.addCleanup(urllib.request.urlcleanup) # Ignore proxies for localhost tests. def restore_environ(old_environ): os.environ.clear() os.environ.update(old_environ) self.addCleanup(restore_environ, os.environ.copy()) os.environ['NO_PROXY'] = '*' os.environ['no_proxy'] = '*' def urlopen(self, url, data=None, **kwargs): l = [] f = urllib.request.urlopen(url, data, **kwargs) try: # Exercise various methods l.extend(f.readlines(200)) l.append(f.readline()) l.append(f.read(1024)) l.append(f.read()) finally: f.close() return b"".join(l) def stop_server(self): self.server.stop() self.server = None def start_server(self, responses=None): if responses is None: responses = [(200, [], b"we don't care")] handler = GetRequestHandler(responses) self.server = LoopbackHttpServerThread(handler) self.addCleanup(self.stop_server) self.server.start() self.server.ready.wait() port = self.server.port handler.port = port return handler def start_https_server(self, responses=None, **kwargs): if not hasattr(urllib.request, 'HTTPSHandler'): self.skipTest('ssl support required') from test.ssl_servers import make_https_server if responses is None: responses = [(200, [], b"we care a bit")] handler = GetRequestHandler(responses) server = make_https_server(self, handler_class=handler, **kwargs) handler.port = server.port return handler def test_redirection(self): expected_response = b"We got here..." responses = [ (302, [("Location", "http://localhost:%(port)s/somewhere_else")], ""), (200, [], expected_response) ] handler = self.start_server(responses) data = self.urlopen("http://localhost:%s/" % handler.port) self.assertEqual(data, expected_response) self.assertEqual(handler.requests, ["/", "/somewhere_else"]) def test_chunked(self): expected_response = b"hello world" chunked_start = ( b'a\r\n' b'hello worl\r\n' b'1\r\n' b'd\r\n' b'0\r\n' ) response = [(200, [("Transfer-Encoding", "chunked")], chunked_start)] handler = self.start_server(response) data = self.urlopen("http://localhost:%s/" % handler.port) self.assertEqual(data, expected_response) def test_404(self): expected_response = b"Bad bad bad..." handler = self.start_server([(404, [], expected_response)]) try: self.urlopen("http://localhost:%s/weeble" % handler.port) except urllib.error.URLError as f: data = f.read() f.close() else: self.fail("404 should raise URLError") self.assertEqual(data, expected_response) self.assertEqual(handler.requests, ["/weeble"]) def test_200(self): expected_response = b"pycon 2008..." handler = self.start_server([(200, [], expected_response)]) data = self.urlopen("http://localhost:%s/bizarre" % handler.port) self.assertEqual(data, expected_response) self.assertEqual(handler.requests, ["/bizarre"]) def test_200_with_parameters(self): expected_response = b"pycon 2008..." handler = self.start_server([(200, [], expected_response)]) data = self.urlopen("http://localhost:%s/bizarre" % handler.port, b"get=with_feeling") self.assertEqual(data, expected_response) self.assertEqual(handler.requests, ["/bizarre", b"get=with_feeling"]) def test_https(self): handler = self.start_https_server() context = ssl.create_default_context(cafile=CERT_localhost) data = self.urlopen("https://localhost:%s/bizarre" % handler.port, context=context) self.assertEqual(data, b"we care a bit") def test_https_with_cafile(self): handler = self.start_https_server(certfile=CERT_localhost) with support.check_warnings(('', DeprecationWarning)): # Good cert data = self.urlopen("https://localhost:%s/bizarre" % handler.port, cafile=CERT_localhost) self.assertEqual(data, b"we care a bit") # Bad cert with self.assertRaises(urllib.error.URLError) as cm: self.urlopen("https://localhost:%s/bizarre" % handler.port, cafile=CERT_fakehostname) # Good cert, but mismatching hostname handler = self.start_https_server(certfile=CERT_fakehostname) with self.assertRaises(urllib.error.URLError) as cm: self.urlopen("https://localhost:%s/bizarre" % handler.port, cafile=CERT_fakehostname) def test_https_with_cadefault(self): handler = self.start_https_server(certfile=CERT_localhost) # Self-signed cert should fail verification with system certificate store with support.check_warnings(('', DeprecationWarning)): with self.assertRaises(urllib.error.URLError) as cm: self.urlopen("https://localhost:%s/bizarre" % handler.port, cadefault=True) def test_https_sni(self): if ssl is None: self.skipTest("ssl module required") if not ssl.HAS_SNI: self.skipTest("SNI support required in OpenSSL") sni_name = None def cb_sni(ssl_sock, server_name, initial_context): nonlocal sni_name sni_name = server_name context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER) context.set_servername_callback(cb_sni) handler = self.start_https_server(context=context, certfile=CERT_localhost) context = ssl.create_default_context(cafile=CERT_localhost) self.urlopen("https://localhost:%s" % handler.port, context=context) self.assertEqual(sni_name, "localhost") def test_sending_headers(self): handler = self.start_server() req = urllib.request.Request("http://localhost:%s/" % handler.port, headers={"Range": "bytes=20-39"}) with urllib.request.urlopen(req): pass self.assertEqual(handler.headers_received["Range"], "bytes=20-39") def test_basic(self): handler = self.start_server() with urllib.request.urlopen("http://localhost:%s" % handler.port) as open_url: for attr in ("read", "close", "info", "geturl"): self.assertTrue(hasattr(open_url, attr), "object returned from " "urlopen lacks the %s attribute" % attr) self.assertTrue(open_url.read(), "calling 'read' failed") def test_info(self): handler = self.start_server() open_url = urllib.request.urlopen( "http://localhost:%s" % handler.port) with open_url: info_obj = open_url.info() self.assertIsInstance(info_obj, email.message.Message, "object returned by 'info' is not an " "instance of email.message.Message") self.assertEqual(info_obj.get_content_subtype(), "plain") def test_geturl(self): # Make sure same URL as opened is returned by geturl. handler = self.start_server() open_url = urllib.request.urlopen("http://localhost:%s" % handler.port) with open_url: url = open_url.geturl() self.assertEqual(url, "http://localhost:%s" % handler.port) def test_iteration(self): expected_response = b"pycon 2008..." handler = self.start_server([(200, [], expected_response)]) data = urllib.request.urlopen("http://localhost:%s" % handler.port) for line in data: self.assertEqual(line, expected_response) def test_line_iteration(self): lines = [b"We\n", b"got\n", b"here\n", b"verylong " * 8192 + b"\n"] expected_response = b"".join(lines) handler = self.start_server([(200, [], expected_response)]) data = urllib.request.urlopen("http://localhost:%s" % handler.port) for index, line in enumerate(data): self.assertEqual(line, lines[index], "Fetched line number %s doesn't match expected:\n" " Expected length was %s, got %s" % (index, len(lines[index]), len(line))) self.assertEqual(index + 1, len(lines)) threads_key = None def setUpModule(): # Store the threading_setup in a key and ensure that it is cleaned up # in the tearDown global threads_key threads_key = support.threading_setup() def tearDownModule(): if threads_key: support.threading_cleanup(*threads_key) if __name__ == "__main__": unittest.main()