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test_socks.py
# Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. """ Tests for L{twisted.protocol.socks}, an implementation of the SOCKSv4 and SOCKSv4a protocols. """ import socket import struct from twisted.internet import address, defer from twisted.internet.error import DNSLookupError from twisted.protocols import socks from twisted.python.compat import iterbytes from twisted.test import proto_helpers from twisted.trial import unittest class StringTCPTransport(proto_helpers.StringTransport): stringTCPTransport_closing = False peer = None def getPeer(self): return self.peer def getHost(self): return address.IPv4Address("TCP", "2.3.4.5", 42) def loseConnection(self): self.stringTCPTransport_closing = True class FakeResolverReactor: """ Bare-bones reactor with deterministic behavior for the resolve method. """ def __init__(self, names): """ @type names: L{dict} containing L{str} keys and L{str} values. @param names: A hostname to IP address mapping. The IP addresses are stringified dotted quads. """ self.names = names def resolve(self, hostname): """ Resolve a hostname by looking it up in the C{names} dictionary. """ try: return defer.succeed(self.names[hostname]) except KeyError: return defer.fail( DNSLookupError( "FakeResolverReactor couldn't find " + hostname.decode("utf-8") ) ) class SOCKSv4Driver(socks.SOCKSv4): # last SOCKSv4Outgoing instantiated driver_outgoing = None # last SOCKSv4IncomingFactory instantiated driver_listen = None def connectClass(self, host, port, klass, *args): # fake it proto = klass(*args) proto.transport = StringTCPTransport() proto.transport.peer = address.IPv4Address("TCP", host, port) proto.connectionMade() self.driver_outgoing = proto return defer.succeed(proto) def listenClass(self, port, klass, *args): # fake it factory = klass(*args) self.driver_listen = factory if port == 0: port = 1234 return defer.succeed(("6.7.8.9", port)) class ConnectTests(unittest.TestCase): """ Tests for SOCKS and SOCKSv4a connect requests using the L{SOCKSv4} protocol. """ def setUp(self): self.sock = SOCKSv4Driver() self.sock.transport = StringTCPTransport() self.sock.connectionMade() self.sock.reactor = FakeResolverReactor({b"localhost": "127.0.0.1"}) def tearDown(self): outgoing = self.sock.driver_outgoing if outgoing is not None: self.assertTrue( outgoing.transport.stringTCPTransport_closing, "Outgoing SOCKS connections need to be closed.", ) def test_simple(self): self.sock.dataReceived( struct.pack("!BBH", 4, 1, 34) + socket.inet_aton("1.2.3.4") + b"fooBAR" + b"\0" ) sent = self.sock.transport.value() self.sock.transport.clear() self.assertEqual( sent, struct.pack("!BBH", 0, 90, 34) + socket.inet_aton("1.2.3.4") ) self.assertFalse(self.sock.transport.stringTCPTransport_closing) self.assertIsNotNone(self.sock.driver_outgoing) # pass some data through self.sock.dataReceived(b"hello, world") self.assertEqual(self.sock.driver_outgoing.transport.value(), b"hello, world") # the other way around self.sock.driver_outgoing.dataReceived(b"hi there") self.assertEqual(self.sock.transport.value(), b"hi there") self.sock.connectionLost("fake reason") def test_socks4aSuccessfulResolution(self): """ If the destination IP address has zeros for the first three octets and non-zero for the fourth octet, the client is attempting a v4a connection. A hostname is specified after the user ID string and the server connects to the address that hostname resolves to. @see: U{http://en.wikipedia.org/wiki/SOCKS#SOCKS_4a_protocol} """ # send the domain name "localhost" to be resolved clientRequest = ( struct.pack("!BBH", 4, 1, 34) + socket.inet_aton("0.0.0.1") + b"fooBAZ\0" + b"localhost\0" ) # Deliver the bytes one by one to exercise the protocol's buffering # logic. FakeResolverReactor's resolve method is invoked to "resolve" # the hostname. for byte in iterbytes(clientRequest): self.sock.dataReceived(byte) sent = self.sock.transport.value() self.sock.transport.clear() # Verify that the server responded with the address which will be # connected to. self.assertEqual( sent, struct.pack("!BBH", 0, 90, 34) + socket.inet_aton("127.0.0.1") ) self.assertFalse(self.sock.transport.stringTCPTransport_closing) self.assertIsNotNone(self.sock.driver_outgoing) # Pass some data through and verify it is forwarded to the outgoing # connection. self.sock.dataReceived(b"hello, world") self.assertEqual(self.sock.driver_outgoing.transport.value(), b"hello, world") # Deliver some data from the output connection and verify it is # passed along to the incoming side. self.sock.driver_outgoing.dataReceived(b"hi there") self.assertEqual(self.sock.transport.value(), b"hi there") self.sock.connectionLost("fake reason") def test_socks4aFailedResolution(self): """ Failed hostname resolution on a SOCKSv4a packet results in a 91 error response and the connection getting closed. """ # send the domain name "failinghost" to be resolved clientRequest = ( struct.pack("!BBH", 4, 1, 34) + socket.inet_aton("0.0.0.1") + b"fooBAZ\0" + b"failinghost\0" ) # Deliver the bytes one by one to exercise the protocol's buffering # logic. FakeResolverReactor's resolve method is invoked to "resolve" # the hostname. for byte in iterbytes(clientRequest): self.sock.dataReceived(byte) # Verify that the server responds with a 91 error. sent = self.sock.transport.value() self.assertEqual( sent, struct.pack("!BBH", 0, 91, 0) + socket.inet_aton("0.0.0.0") ) # A failed resolution causes the transport to drop the connection. self.assertTrue(self.sock.transport.stringTCPTransport_closing) self.assertIsNone(self.sock.driver_outgoing) def test_accessDenied(self): self.sock.authorize = lambda code, server, port, user: 0 self.sock.dataReceived( struct.pack("!BBH", 4, 1, 4242) + socket.inet_aton("10.2.3.4") + b"fooBAR" + b"\0" ) self.assertEqual( self.sock.transport.value(), struct.pack("!BBH", 0, 91, 0) + socket.inet_aton("0.0.0.0"), ) self.assertTrue(self.sock.transport.stringTCPTransport_closing) self.assertIsNone(self.sock.driver_outgoing) def test_eofRemote(self): self.sock.dataReceived( struct.pack("!BBH", 4, 1, 34) + socket.inet_aton("1.2.3.4") + b"fooBAR" + b"\0" ) self.sock.transport.clear() # pass some data through self.sock.dataReceived(b"hello, world") self.assertEqual(self.sock.driver_outgoing.transport.value(), b"hello, world") # now close it from the server side self.sock.driver_outgoing.transport.loseConnection() self.sock.driver_outgoing.connectionLost("fake reason") def test_eofLocal(self): self.sock.dataReceived( struct.pack("!BBH", 4, 1, 34) + socket.inet_aton("1.2.3.4") + b"fooBAR" + b"\0" ) self.sock.transport.clear() # pass some data through self.sock.dataReceived(b"hello, world") self.assertEqual(self.sock.driver_outgoing.transport.value(), b"hello, world") # now close it from the client side self.sock.connectionLost("fake reason") class BindTests(unittest.TestCase): """ Tests for SOCKS and SOCKSv4a bind requests using the L{SOCKSv4} protocol. """ def setUp(self): self.sock = SOCKSv4Driver() self.sock.transport = StringTCPTransport() self.sock.connectionMade() self.sock.reactor = FakeResolverReactor({b"localhost": "127.0.0.1"}) ## def tearDown(self): ## # TODO ensure the listen port is closed ## listen = self.sock.driver_listen ## if listen is not None: ## self.assert_(incoming.transport.stringTCPTransport_closing, ## "Incoming SOCKS connections need to be closed.") def test_simple(self): self.sock.dataReceived( struct.pack("!BBH", 4, 2, 34) + socket.inet_aton("1.2.3.4") + b"fooBAR" + b"\0" ) sent = self.sock.transport.value() self.sock.transport.clear() self.assertEqual( sent, struct.pack("!BBH", 0, 90, 1234) + socket.inet_aton("6.7.8.9") ) self.assertFalse(self.sock.transport.stringTCPTransport_closing) self.assertIsNotNone(self.sock.driver_listen) # connect incoming = self.sock.driver_listen.buildProtocol(("1.2.3.4", 5345)) self.assertIsNotNone(incoming) incoming.transport = StringTCPTransport() incoming.connectionMade() # now we should have the second reply packet sent = self.sock.transport.value() self.sock.transport.clear() self.assertEqual( sent, struct.pack("!BBH", 0, 90, 0) + socket.inet_aton("0.0.0.0") ) self.assertFalse(self.sock.transport.stringTCPTransport_closing) # pass some data through self.sock.dataReceived(b"hello, world") self.assertEqual(incoming.transport.value(), b"hello, world") # the other way around incoming.dataReceived(b"hi there") self.assertEqual(self.sock.transport.value(), b"hi there") self.sock.connectionLost("fake reason") def test_socks4a(self): """ If the destination IP address has zeros for the first three octets and non-zero for the fourth octet, the client is attempting a v4a connection. A hostname is specified after the user ID string and the server connects to the address that hostname resolves to. @see: U{http://en.wikipedia.org/wiki/SOCKS#SOCKS_4a_protocol} """ # send the domain name "localhost" to be resolved clientRequest = ( struct.pack("!BBH", 4, 2, 34) + socket.inet_aton("0.0.0.1") + b"fooBAZ\0" + b"localhost\0" ) # Deliver the bytes one by one to exercise the protocol's buffering # logic. FakeResolverReactor's resolve method is invoked to "resolve" # the hostname. for byte in iterbytes(clientRequest): self.sock.dataReceived(byte) sent = self.sock.transport.value() self.sock.transport.clear() # Verify that the server responded with the address which will be # connected to. self.assertEqual( sent, struct.pack("!BBH", 0, 90, 1234) + socket.inet_aton("6.7.8.9") ) self.assertFalse(self.sock.transport.stringTCPTransport_closing) self.assertIsNotNone(self.sock.driver_listen) # connect incoming = self.sock.driver_listen.buildProtocol(("127.0.0.1", 5345)) self.assertIsNotNone(incoming) incoming.transport = StringTCPTransport() incoming.connectionMade() # now we should have the second reply packet sent = self.sock.transport.value() self.sock.transport.clear() self.assertEqual( sent, struct.pack("!BBH", 0, 90, 0) + socket.inet_aton("0.0.0.0") ) self.assertIsNot(self.sock.transport.stringTCPTransport_closing, None) # Deliver some data from the output connection and verify it is # passed along to the incoming side. self.sock.dataReceived(b"hi there") self.assertEqual(incoming.transport.value(), b"hi there") # the other way around incoming.dataReceived(b"hi there") self.assertEqual(self.sock.transport.value(), b"hi there") self.sock.connectionLost("fake reason") def test_socks4aFailedResolution(self): """ Failed hostname resolution on a SOCKSv4a packet results in a 91 error response and the connection getting closed. """ # send the domain name "failinghost" to be resolved clientRequest = ( struct.pack("!BBH", 4, 2, 34) + socket.inet_aton("0.0.0.1") + b"fooBAZ\0" + b"failinghost\0" ) # Deliver the bytes one by one to exercise the protocol's buffering # logic. FakeResolverReactor's resolve method is invoked to "resolve" # the hostname. for byte in iterbytes(clientRequest): self.sock.dataReceived(byte) # Verify that the server responds with a 91 error. sent = self.sock.transport.value() self.assertEqual( sent, struct.pack("!BBH", 0, 91, 0) + socket.inet_aton("0.0.0.0") ) # A failed resolution causes the transport to drop the connection. self.assertTrue(self.sock.transport.stringTCPTransport_closing) self.assertIsNone(self.sock.driver_outgoing) def test_accessDenied(self): self.sock.authorize = lambda code, server, port, user: 0 self.sock.dataReceived( struct.pack("!BBH", 4, 2, 4242) + socket.inet_aton("10.2.3.4") + b"fooBAR" + b"\0" ) self.assertEqual( self.sock.transport.value(), struct.pack("!BBH", 0, 91, 0) + socket.inet_aton("0.0.0.0"), ) self.assertTrue(self.sock.transport.stringTCPTransport_closing) self.assertIsNone(self.sock.driver_listen) def test_eofRemote(self): self.sock.dataReceived( struct.pack("!BBH", 4, 2, 34) + socket.inet_aton("1.2.3.4") + b"fooBAR" + b"\0" ) sent = self.sock.transport.value() self.sock.transport.clear() # connect incoming = self.sock.driver_listen.buildProtocol(("1.2.3.4", 5345)) self.assertIsNotNone(incoming) incoming.transport = StringTCPTransport() incoming.connectionMade() # now we should have the second reply packet sent = self.sock.transport.value() self.sock.transport.clear() self.assertEqual( sent, struct.pack("!BBH", 0, 90, 0) + socket.inet_aton("0.0.0.0") ) self.assertFalse(self.sock.transport.stringTCPTransport_closing) # pass some data through self.sock.dataReceived(b"hello, world") self.assertEqual(incoming.transport.value(), b"hello, world") # now close it from the server side incoming.transport.loseConnection() incoming.connectionLost("fake reason") def test_eofLocal(self): self.sock.dataReceived( struct.pack("!BBH", 4, 2, 34) + socket.inet_aton("1.2.3.4") + b"fooBAR" + b"\0" ) sent = self.sock.transport.value() self.sock.transport.clear() # connect incoming = self.sock.driver_listen.buildProtocol(("1.2.3.4", 5345)) self.assertIsNotNone(incoming) incoming.transport = StringTCPTransport() incoming.connectionMade() # now we should have the second reply packet sent = self.sock.transport.value() self.sock.transport.clear() self.assertEqual( sent, struct.pack("!BBH", 0, 90, 0) + socket.inet_aton("0.0.0.0") ) self.assertFalse(self.sock.transport.stringTCPTransport_closing) # pass some data through self.sock.dataReceived(b"hello, world") self.assertEqual(incoming.transport.value(), b"hello, world") # now close it from the client side self.sock.connectionLost("fake reason") def test_badSource(self): self.sock.dataReceived( struct.pack("!BBH", 4, 2, 34) + socket.inet_aton("1.2.3.4") + b"fooBAR" + b"\0" ) sent = self.sock.transport.value() self.sock.transport.clear() # connect from WRONG address incoming = self.sock.driver_listen.buildProtocol(("1.6.6.6", 666)) self.assertIsNone(incoming) # Now we should have the second reply packet and it should # be a failure. The connection should be closing. sent = self.sock.transport.value() self.sock.transport.clear() self.assertEqual( sent, struct.pack("!BBH", 0, 91, 0) + socket.inet_aton("0.0.0.0") ) self.assertTrue(self.sock.transport.stringTCPTransport_closing)
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