def test_send_incorrect_state_request(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("request")
event = GreetingRequest((AUTH_TYPE["NO_AUTH"], ))
with self.assertRaises(ProtocolError):
conn.send(event)
def test_recv_incorrect_state_request(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("request")
raw_data = b""
with self.assertRaises(ProtocolError):
conn.recv(raw_data)
def test_send_incorrect_state_response(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("response")
event = GreetingResponse(AUTH_TYPE["NO_AUTH"])
with self.assertRaises(ProtocolError):
conn.send(event)
def test_send_incorrect_state_request(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("request")
event = GreetingRequest((AUTH_TYPE["NO_AUTH"], ))
with self.assertRaises(ProtocolError):
conn.send(event)
def test_recv_incorrect_state_request(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("request")
raw_data = b""
with self.assertRaises(ProtocolError):
conn.recv(raw_data)
def test_send_incorrect_state_response(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("response")
event = GreetingResponse(AUTH_TYPE["NO_AUTH"])
with self.assertRaises(ProtocolError):
conn.send(event)
def test_recv_need_more_data(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_request")
raw_data = b"\x05"
event = conn.recv(raw_data)
self.assertEqual(conn._conn.state, "greeting_request")
self.assertEqual(event, "NeedMoreData")
def test_recv_need_more_data(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_request")
raw_data = b"\x05"
event = conn.recv(raw_data)
self.assertEqual(conn._conn.state, "greeting_request")
self.assertEqual(event, "NeedMoreData")
def test_send_greeting_response_with_unsupported_auth(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 5
conn._conn._auth_methods = [AUTH_TYPE["NO_SUPPORT_AUTH_METHOD"]]
event = GreetingResponse(AUTH_TYPE["NO_SUPPORT_AUTH_METHOD"])
conn.send(event)
self.assertEqual(conn._conn.state, "end")
def test_send_greeting_response_with_valid_auth(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 5
conn._conn._auth_methods = [AUTH_TYPE["USERNAME_PASSWD"]]
event = GreetingResponse(AUTH_TYPE["USERNAME_PASSWD"])
conn.send(event)
self.assertEqual(conn._conn.state, "auth_inprogress")
def test_recv_in_greeting_response_with_incorrect_auth_method(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 5
conn._conn._auth_methods = [AUTH_TYPE["NO_SUPPORT_AUTH_METHOD"]]
raw_data = struct.pack("!BB", 0x5, 0x2)
with self.assertRaises(ProtocolError):
conn.recv(raw_data)
def test_send_greeting_response_with_incorrect_event_detail_version(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 5
conn._conn._auth_methods = [AUTH_TYPE["NO_SUPPORT_AUTH_METHOD"]]
event = Socks4Response(0x5a, "127.0.0.1", 5580)
with self.assertRaises(ProtocolError):
conn.send(event)
def test_send_greeting_response_with_incorrect_event_detail_auth_type(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 5
conn._conn._auth_methods = [AUTH_TYPE["NO_SUPPORT_AUTH_METHOD"]]
event = GreetingResponse(AUTH_TYPE["NO_AUTH"])
with self.assertRaises(ProtocolError):
conn.send(event)
def test_send_in_greeting_request(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("greeting_request")
event = GreetingRequest((AUTH_TYPE["NO_AUTH"], ))
data = conn.send(event)
expected_data = struct.pack("!BBB", 0x5, 0x1, 0x00)
self.assertEqual(conn._conn.state, "greeting_response")
self.assertEqual(data, expected_data)
def test_send_in_greeting_request(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("greeting_request")
event = GreetingRequest((AUTH_TYPE["NO_AUTH"], ))
data = conn.send(event)
expected_data = struct.pack("!BBB", 0x5, 0x1, 0x00)
self.assertEqual(conn._conn.state, "greeting_response")
self.assertEqual(data, expected_data)
def test_recv_in_greeting_response_socks4_incorrect_version(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 4
conn._conn._port = 5580
raw_data = struct.pack("!BB", 0x5, 0xff)
with self.assertRaises(ProtocolError):
conn.recv(raw_data)
def test_recv_in_greeting_response_with_unsupported_auth(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 5
conn._conn._auth_methods = [AUTH_TYPE["NO_SUPPORT_AUTH_METHOD"]]
raw_data = struct.pack("!BB", 0x5, 0xff)
conn.recv(raw_data)
self.assertEqual(conn._conn.state, "end")
def test_recv_in_greeting_response_with_valid_auth(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 5
conn._conn._auth_methods = [AUTH_TYPE["USERNAME_PASSWD"]]
raw_data = struct.pack("!BB", 0x5, 0x2)
conn.recv(raw_data)
self.assertEqual(conn._conn.state, "auth_inprogress")
def test_recv_in_greeting_response_with_unsupported_auth(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 5
conn._conn._auth_methods = [AUTH_TYPE["NO_SUPPORT_AUTH_METHOD"]]
raw_data = struct.pack("!BB", 0x5, 0xff)
conn.recv(raw_data)
self.assertEqual(conn._conn.state, "end")
def test_recv_in_greeting_response_with_incorrect_auth_method(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 5
conn._conn._auth_methods = [AUTH_TYPE["NO_SUPPORT_AUTH_METHOD"]]
raw_data = struct.pack("!BB", 0x5, 0x2)
with self.assertRaises(ProtocolError):
conn.recv(raw_data)
def test_send_greeting_response_socks4_with_incorrect_event_detail_verion(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 4
conn._conn._port = 5580
event = GreetingResponse(AUTH_TYPE["NO_AUTH"])
with self.assertRaises(ProtocolError):
conn.send(event)
def test_send_greeting_response_socks4_with_incorrect_event_detail_port(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 4
conn._conn._port = 5580
event = Socks4Response(0x5a, "127.0.0.1", 5581)
with self.assertRaises(ProtocolError):
conn.send(event)
def test_send_in_request_request(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("request")
event = Request(REQ_COMMAND["CONNECT"], ADDR_TYPE["IPV4"], u"127.0.0.1", 8080)
data = conn.send(event)
expected_data = struct.pack("!BBxB4BH", 0x5, 0x1, 0x1, 127, 0, 0, 1, 8080)
self.assertEqual(conn._conn.state, "response")
self.assertEqual(data, expected_data)
def test_recv_in_greeting_response_with_valid_auth(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 5
conn._conn._auth_methods = [AUTH_TYPE["USERNAME_PASSWD"]]
raw_data = struct.pack("!BB", 0x5, 0x2)
conn.recv(raw_data)
self.assertEqual(conn._conn.state, "auth_inprogress")
def test_send_greeting_response_with_unsupported_auth(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 5
conn._conn._auth_methods = [AUTH_TYPE["NO_SUPPORT_AUTH_METHOD"]]
event = GreetingResponse(AUTH_TYPE["NO_SUPPORT_AUTH_METHOD"])
conn.send(event)
self.assertEqual(conn._conn.state, "end")
def test_recv_in_greeting_response_socks4_incorrect_version(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 4
conn._conn._port = 5580
raw_data = struct.pack("!BB", 0x5, 0xff)
with self.assertRaises(ProtocolError):
conn.recv(raw_data)
def test_send_greeting_response_with_valid_auth(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 5
conn._conn._auth_methods = [AUTH_TYPE["USERNAME_PASSWD"]]
event = GreetingResponse(AUTH_TYPE["USERNAME_PASSWD"])
conn.send(event)
self.assertEqual(conn._conn.state, "auth_inprogress")
def test_send_in_greeting_request_socks4(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("greeting_request")
event = Socks4Request(1, "127.0.0.1", 5580, "Johnny")
data = conn.send(event)
expected_data = struct.pack("!BBH4B6sB", 0x4, 0x1, 5580, 127, 0, 0, 1, "Johnny".encode("ascii"), 0)
self.assertEqual(conn._conn.state, "greeting_response")
self.assertEqual(data, expected_data)
def test_send_greeting_response_socks4_with_incorrect_event_detail_port(
self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 4
conn._conn._port = 5580
event = Socks4Response(0x5a, "127.0.0.1", 5581)
with self.assertRaises(ProtocolError):
conn.send(event)
def test_send_greeting_response_socks4_with_incorrect_event_detail_verion(
self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 4
conn._conn._port = 5580
event = GreetingResponse(AUTH_TYPE["NO_AUTH"])
with self.assertRaises(ProtocolError):
conn.send(event)
def test_send_in_greeting_request_socks4(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("greeting_request")
event = Socks4Request(1, "127.0.0.1", 5580, "Johnny")
data = conn.send(event)
expected_data = struct.pack("!BBH4B6sB", 0x4, 0x1, 5580, 127, 0, 0, 1,
"Johnny".encode("ascii"), 0)
self.assertEqual(conn._conn.state, "greeting_response")
self.assertEqual(data, expected_data)
def test_recv_in_greeting_request_socks4(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_request")
raw_data = struct.pack("!BBH4B6sB", 0x4, 0x1, 5580, 127, 0, 0, 1, "Johnny".encode("ascii"), 0)
event = conn.recv(raw_data)
self.assertEqual(event, "Socks4Request")
self.assertEqual(event.cmd, 1)
self.assertEqual(event.port, 5580)
self.assertEqual(event.addr, ipaddress.IPv4Address("127.0.0.1"))
self.assertEqual(event.name, "Johnny")
def test_send_response_with_incorrect_event_detail_port(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("response")
conn._conn._version = 5
conn._conn._addr_type = ADDR_TYPE["IPV4"]
conn._conn._addr = ipaddress.IPv4Address("127.0.0.1")
conn._conn._port = 8080
event = Response(RESP_STATUS["SUCCESS"], ADDR_TYPE["IPV4"], "127.0.0.1", 5580)
with self.assertRaises(ProtocolError):
conn.send(event)
def test_send_in_request_request(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("request")
event = Request(REQ_COMMAND["CONNECT"], ADDR_TYPE["IPV4"],
u"127.0.0.1", 8080)
data = conn.send(event)
expected_data = struct.pack("!BBxB4BH", 0x5, 0x1, 0x1, 127, 0, 0, 1,
8080)
self.assertEqual(conn._conn.state, "response")
self.assertEqual(data, expected_data)
def test_recv_in_greeting_request_socks4(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_request")
raw_data = struct.pack("!BBH4B6sB", 0x4, 0x1, 5580, 127, 0, 0, 1,
"Johnny".encode("ascii"), 0)
event = conn.recv(raw_data)
self.assertEqual(event, "Socks4Request")
self.assertEqual(event.cmd, 1)
self.assertEqual(event.port, 5580)
self.assertEqual(event.addr, ipaddress.IPv4Address("127.0.0.1"))
self.assertEqual(event.name, "Johnny")
def test_recv_in_greeting_request(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_request")
raw_data = struct.pack("!BB2B", 0x5, 0x2, 0x00, 0x01)
event = conn.recv(raw_data)
self.assertEqual(conn._conn.state, "greeting_response")
self.assertEqual(event, "GreetingRequest")
self.assertEqual(event.nmethod, 2)
self.assertIn(0, event.methods)
self.assertIn(1, event.methods)
def test_recv_in_greeting_request(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_request")
raw_data = struct.pack("!BB2B", 0x5, 0x2, 0x00, 0x01)
event = conn.recv(raw_data)
self.assertEqual(conn._conn.state, "greeting_response")
self.assertEqual(event, "GreetingRequest")
self.assertEqual(event.nmethod, 2)
self.assertIn(0, event.methods)
self.assertIn(1, event.methods)
def test_recv_in_response_with_incorrect_addr(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("response")
conn._conn._version = 5
conn._conn._addr_type = ADDR_TYPE["IPV4"]
conn._conn._addr = ipaddress.IPv4Address("127.0.0.1")
conn._conn._port = 8080
raw_data = struct.pack("!BBxB4BH", 0x5, 0x0, 0x1, 127, 0, 0, 2, 8080)
with self.assertRaises(ProtocolError):
conn.recv(raw_data)
def test_send_greeting_response_no_auth(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 5
conn._conn._auth_methods = [AUTH_TYPE["NO_AUTH"]]
event = GreetingResponse(AUTH_TYPE["NO_AUTH"])
data = conn.send(event)
expected_data = struct.pack("!BB", 0x5, 0x0)
self.assertEqual(conn._conn.state, "request")
self.assertEqual(data, expected_data)
def test_recv_in_greeting_response_no_auth(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 5
conn._conn._auth_methods = [AUTH_TYPE["NO_AUTH"]]
raw_data = struct.pack("!BB", 0x5, 0x0)
event = conn.recv(raw_data)
self.assertEqual(conn._conn.state, "request")
self.assertEqual(event, "GreetingResponse")
self.assertEqual(event.auth_type, 0)
def test_recv_in_greeting_response_no_auth(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 5
conn._conn._auth_methods = [AUTH_TYPE["NO_AUTH"]]
raw_data = struct.pack("!BB", 0x5, 0x0)
event = conn.recv(raw_data)
self.assertEqual(conn._conn.state, "request")
self.assertEqual(event, "GreetingResponse")
self.assertEqual(event.auth_type, 0)
def test_send_greeting_response_socks4(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 4
conn._conn._port = 5580
event = Socks4Response(0x5a, "127.0.0.1", 5580)
data = conn.send(event)
expected_data = struct.pack("!BBH4B", 0, 0x5a, 5580, 127, 0, 0, 1)
self.assertEqual(conn._conn.state, "end")
self.assertEqual(data, expected_data)
def test_send_greeting_response_no_auth(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 5
conn._conn._auth_methods = [AUTH_TYPE["NO_AUTH"]]
event = GreetingResponse(AUTH_TYPE["NO_AUTH"])
data = conn.send(event)
expected_data = struct.pack("!BB", 0x5, 0x0)
self.assertEqual(conn._conn.state, "request")
self.assertEqual(data, expected_data)
def test_send_response_with_incorrect_event_detail_port(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("response")
conn._conn._version = 5
conn._conn._addr_type = ADDR_TYPE["IPV4"]
conn._conn._addr = ipaddress.IPv4Address("127.0.0.1")
conn._conn._port = 8080
event = Response(RESP_STATUS["SUCCESS"], ADDR_TYPE["IPV4"],
"127.0.0.1", 5580)
with self.assertRaises(ProtocolError):
conn.send(event)
def test_recv_in_request(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("request")
raw_data = struct.pack("!BBxB4BH", 0x5, 0x1, 0x1, 127, 0, 0, 1, 8080)
event = conn.recv(raw_data)
self.assertEqual(conn._conn.state, "response")
self.assertEqual(event, "Request")
self.assertEqual(event.cmd, 1)
self.assertEqual(event.atyp, 1)
self.assertEqual(event.addr, ipaddress.IPv4Address("127.0.0.1"))
self.assertEqual(event.port, 8080)
def test_send_greeting_response_socks4(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 4
conn._conn._port = 5580
event = Socks4Response(0x5a, "127.0.0.1", 5580)
data = conn.send(event)
expected_data = struct.pack("!BBH4B", 0, 0x5a, 5580, 127, 0, 0, 1)
self.assertEqual(conn._conn.state, "end")
self.assertEqual(data, expected_data)
def test_recv_in_request(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("request")
raw_data = struct.pack("!BBxB4BH", 0x5, 0x1, 0x1, 127, 0, 0, 1, 8080)
event = conn.recv(raw_data)
self.assertEqual(conn._conn.state, "response")
self.assertEqual(event, "Request")
self.assertEqual(event.cmd, 1)
self.assertEqual(event.atyp, 1)
self.assertEqual(event.addr, ipaddress.IPv4Address("127.0.0.1"))
self.assertEqual(event.port, 8080)
def test_send_response(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("response")
conn._conn._version = 5
conn._conn._addr_type = ADDR_TYPE["IPV4"]
conn._conn._addr = ipaddress.IPv4Address("127.0.0.1")
conn._conn._port = 8080
event = Response(RESP_STATUS["SUCCESS"], ADDR_TYPE["IPV4"], "127.0.0.1", 8080)
data = conn.send(event)
expected_data = struct.pack("!BBxB4BH", 0x5, 0x0, 0x1, 127, 0, 0, 1, 8080)
self.assertEqual(conn._conn.state, "end")
self.assertEqual(data, expected_data)
def test_recv_in_greeting_response_socks4(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 4
conn._conn._port = 5580
raw_data = struct.pack("!BBH4B", 0, 0x5a, 5580, 127, 0, 0, 1)
event = conn.recv(raw_data)
self.assertEqual(conn._conn.state, "end")
self.assertEqual(event, "Socks4Response")
self.assertEqual(event.status, 0x5a)
self.assertEqual(event.port, 5580)
self.assertEqual(event.addr, ipaddress.IPv4Address("127.0.0.1"))
def test_recv_in_greeting_response_socks4(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("greeting_response")
conn._conn._version = 4
conn._conn._port = 5580
raw_data = struct.pack("!BBH4B", 0, 0x5a, 5580, 127, 0, 0, 1)
event = conn.recv(raw_data)
self.assertEqual(conn._conn.state, "end")
self.assertEqual(event, "Socks4Response")
self.assertEqual(event.status, 0x5a)
self.assertEqual(event.port, 5580)
self.assertEqual(event.addr, ipaddress.IPv4Address("127.0.0.1"))
def test_send_response(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("response")
conn._conn._version = 5
conn._conn._addr_type = ADDR_TYPE["IPV4"]
conn._conn._addr = ipaddress.IPv4Address("127.0.0.1")
conn._conn._port = 8080
event = Response(RESP_STATUS["SUCCESS"], ADDR_TYPE["IPV4"],
"127.0.0.1", 8080)
data = conn.send(event)
expected_data = struct.pack("!BBxB4BH", 0x5, 0x0, 0x1, 127, 0, 0, 1,
8080)
self.assertEqual(conn._conn.state, "end")
self.assertEqual(data, expected_data)
def test_recv_in_response(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("response")
conn._conn._version = 5
conn._conn._addr_type = ADDR_TYPE["IPV4"]
conn._conn._addr = ipaddress.IPv4Address("127.0.0.1")
conn._conn._port = 8080
raw_data = struct.pack("!BBxB4BH", 0x5, 0x0, 0x1, 127, 0, 0, 1, 8080)
event = conn.recv(raw_data)
self.assertEqual(conn._conn.state, "end")
self.assertEqual(event, "Response")
self.assertEqual(event.status, 0)
self.assertEqual(event.atyp, 1)
self.assertEqual(event.addr, ipaddress.IPv4Address("127.0.0.1"))
self.assertEqual(event.port, 8080)
def test_recv_in_response(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("response")
conn._conn._version = 5
conn._conn._addr_type = ADDR_TYPE["IPV4"]
conn._conn._addr = ipaddress.IPv4Address("127.0.0.1")
conn._conn._port = 8080
raw_data = struct.pack("!BBxB4BH", 0x5, 0x0, 0x1, 127, 0, 0, 1, 8080)
event = conn.recv(raw_data)
self.assertEqual(conn._conn.state, "end")
self.assertEqual(event, "Response")
self.assertEqual(event.status, 0)
self.assertEqual(event.atyp, 1)
self.assertEqual(event.addr, ipaddress.IPv4Address("127.0.0.1"))
self.assertEqual(event.port, 8080)
def test_auth_end_in_incorrect_state(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_request")
with self.assertRaises(ProtocolError):
conn.auth_end()
def test_initiate_connection(self):
conn = Connection(our_role="client")
self.assertEqual(conn._conn.state, "init")
conn.initiate_connection()
self.assertEqual(conn._conn.state, "greeting_request")
def test_initiate_connection(self):
conn = Connection(our_role="client")
self.assertEqual(conn._conn.state, "init")
conn.initiate_connection()
self.assertEqual(conn._conn.state, "greeting_request")
def test_auth_end(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("auth_inprogress")
conn.auth_end()
self.assertEqual(conn._conn.state, "request")
def test_recv_incorrect_state_response(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("response")
with self.assertRaises(ProtocolError):
conn.recv(b"")
def test_auth_end(self):
conn = Connection(our_role="client")
conn._conn.machine.set_state("auth_inprogress")
conn.auth_end()
self.assertEqual(conn._conn.state, "request")
def test_auth_end_in_incorrect_state(self):
conn = Connection(our_role="server")
conn._conn.machine.set_state("greeting_request")
with self.assertRaises(ProtocolError):
conn.auth_end()