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""" from __future__ import division, absolute_import import struct from twisted.python.reflect import requireModule cryptography = requireModule("cryptography") from twisted.conch import error if cryptography: from twisted.conch.ssh import common, connection else: class connection: class SSHConnection: pass from twisted.conch.ssh import channel from twisted.python.compat import long from twisted.trial import unittest from twisted.conch.test import test_userauth class TestChannel(channel.SSHChannel): """ A mocked-up version of twisted.conch.ssh.channel.SSHChannel. @ivar gotOpen: True if channelOpen has been called. @type gotOpen: L{bool} @ivar specificData: the specific channel open data passed to channelOpen. @type specificData: L{bytes} @ivar openFailureReason: the reason passed to openFailed. @type openFailed: C{error.ConchError} @ivar inBuffer: a C{list} of strings received by the channel. @type inBuffer: C{list} @ivar extBuffer: a C{list} of 2-tuples (type, extended data) of received by the channel. @type extBuffer: C{list} @ivar numberRequests: the number of requests that have been made to this channel. @type numberRequests: L{int} @ivar gotEOF: True if the other side sent EOF. @type gotEOF: L{bool} @ivar gotOneClose: True if the other side closed the connection. @type gotOneClose: L{bool} @ivar gotClosed: True if the channel is closed. @type gotClosed: L{bool} """ name = b"TestChannel" gotOpen = False def logPrefix(self): return "TestChannel %i" % self.id def channelOpen(self, specificData): """ The channel is open. Set up the instance variables. """ self.gotOpen = True self.specificData = specificData self.inBuffer = [] self.extBuffer = [] self.numberRequests = 0 self.gotEOF = False self.gotOneClose = False self.gotClosed = False def openFailed(self, reason): """ Opening the channel failed. Store the reason why. """ self.openFailureReason = reason def request_test(self, data): """ A test request. Return True if data is 'data'. @type data: L{bytes} """ self.numberRequests += 1 return data == b'data' def dataReceived(self, data): """ Data was received. Store it in the buffer. """ self.inBuffer.append(data) def extReceived(self, code, data): """ Extended data was received. Store it in the buffer. """ self.extBuffer.append((code, data)) def eofReceived(self): """ EOF was received. Remember it. """ self.gotEOF = True def closeReceived(self): """ Close was received. Remember it. """ self.gotOneClose = True def closed(self): """ The channel is closed. Rembember it. """ self.gotClosed = True class TestAvatar: """ A mocked-up version of twisted.conch.avatar.ConchUser """ _ARGS_ERROR_CODE = 123 def lookupChannel(self, channelType, windowSize, maxPacket, data): """ The server wants us to return a channel. If the requested channel is our TestChannel, return it, otherwise return None. """ if channelType == TestChannel.name: return TestChannel(remoteWindow=windowSize, remoteMaxPacket=maxPacket, data=data, avatar=self) elif channelType == b"conch-error-args": # Raise a ConchError with backwards arguments to make sure the # connection fixes it for us. This case should be deprecated and # deleted eventually, but only after all of Conch gets the argument # order right. raise error.ConchError( self._ARGS_ERROR_CODE, "error args in wrong order") def gotGlobalRequest(self, requestType, data): """ The client has made a global request. If the global request is 'TestGlobal', return True. If the global request is 'TestData', return True and the request-specific data we received. Otherwise, return False. """ if requestType == b'TestGlobal': return True elif requestType == b'TestData': return True, data else: return False class TestConnection(connection.SSHConnection): """ A subclass of SSHConnection for testing. @ivar channel: the current channel. @type channel. C{TestChannel} """ if not cryptography: skip = "Cannot run without cryptography" def logPrefix(self): return "TestConnection" def global_TestGlobal(self, data): """ The other side made the 'TestGlobal' global request. Return True. """ return True def global_Test_Data(self, data): """ The other side made the 'Test-Data' global request. Return True and the data we received. """ return True, data def channel_TestChannel(self, windowSize, maxPacket, data): """ The other side is requesting the TestChannel. Create a C{TestChannel} instance, store it, and return it. """ self.channel = TestChannel(remoteWindow=windowSize, remoteMaxPacket=maxPacket, data=data) return self.channel def channel_ErrorChannel(self, windowSize, maxPacket, data): """ The other side is requesting the ErrorChannel. Raise an exception. """ raise AssertionError('no such thing') class ConnectionTests(unittest.TestCase): if not cryptography: skip = "Cannot run without cryptography" if test_userauth.transport is None: skip = "Cannot run without both cryptography and pyasn1" def setUp(self): self.transport = test_userauth.FakeTransport(None) self.transport.avatar = TestAvatar() self.conn = TestConnection() self.conn.transport = self.transport self.conn.serviceStarted() def _openChannel(self, channel): """ Open the channel with the default connection. """ self.conn.openChannel(channel) self.transport.packets = self.transport.packets[:-1] self.conn.ssh_CHANNEL_OPEN_CONFIRMATION(struct.pack('>2L', channel.id, 255) + b'\x00\x02\x00\x00\x00\x00\x80\x00') def tearDown(self): self.conn.serviceStopped() def test_linkAvatar(self): """ Test that the connection links itself to the avatar in the transport. """ self.assertIs(self.transport.avatar.conn, self.conn) def test_serviceStopped(self): """ Test that serviceStopped() closes any open channels. """ channel1 = TestChannel() channel2 = TestChannel() self.conn.openChannel(channel1) self.conn.openChannel(channel2) self.conn.ssh_CHANNEL_OPEN_CONFIRMATION(b'\x00\x00\x00\x00' * 4) self.assertTrue(channel1.gotOpen) self.assertFalse(channel2.gotOpen) self.conn.serviceStopped() self.assertTrue(channel1.gotClosed) def test_GLOBAL_REQUEST(self): """ Test that global request packets are dispatched to the global_* methods and the return values are translated into success or failure messages. """ self.conn.ssh_GLOBAL_REQUEST(common.NS(b'TestGlobal') + b'\xff') self.assertEqual(self.transport.packets, [(connection.MSG_REQUEST_SUCCESS, b'')]) self.transport.packets = [] self.conn.ssh_GLOBAL_REQUEST(common.NS(b'TestData') + b'\xff' + b'test data') self.assertEqual(self.transport.packets, [(connection.MSG_REQUEST_SUCCESS, b'test data')]) self.transport.packets = [] self.conn.ssh_GLOBAL_REQUEST(common.NS(b'TestBad') + b'\xff') self.assertEqual(self.transport.packets, [(connection.MSG_REQUEST_FAILURE, b'')]) self.transport.packets = [] self.conn.ssh_GLOBAL_REQUEST(common.NS(b'TestGlobal') + b'\x00') self.assertEqual(self.transport.packets, []) def test_REQUEST_SUCCESS(self): """ Test that global request success packets cause the Deferred to be called back. """ d = self.conn.sendGlobalRequest(b'request', b'data', True) self.conn.ssh_REQUEST_SUCCESS(b'data') def check(data): self.assertEqual(data, b'data') d.addCallback(check) d.addErrback(self.fail) return d def test_REQUEST_FAILURE(self): """ Test that global request failure packets cause the Deferred to be erred back. """ d = self.conn.sendGlobalRequest(b'request', b'data', True) self.conn.ssh_REQUEST_FAILURE(b'data') def check(f): self.assertEqual(f.value.data, b'data') d.addCallback(self.fail) d.addErrback(check) return d def test_CHANNEL_OPEN(self): """ Test that open channel packets cause a channel to be created and opened or a failure message to be returned. """ del self.transport.avatar self.conn.ssh_CHANNEL_OPEN(common.NS(b'TestChannel') + b'\x00\x00\x00\x01' * 4) self.assertTrue(self.conn.channel.gotOpen) self.assertEqual(self.conn.channel.conn, self.conn) self.assertEqual(self.conn.channel.data, b'\x00\x00\x00\x01') self.assertEqual(self.conn.channel.specificData, b'\x00\x00\x00\x01') self.assertEqual(self.conn.channel.remoteWindowLeft, 1) self.assertEqual(self.conn.channel.remoteMaxPacket, 1) self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_OPEN_CONFIRMATION, b'\x00\x00\x00\x01\x00\x00\x00\x00\x00\x02\x00\x00' b'\x00\x00\x80\x00')]) self.transport.packets = [] self.conn.ssh_CHANNEL_OPEN(common.NS(b'BadChannel') + b'\x00\x00\x00\x02' * 4) self.flushLoggedErrors() self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_OPEN_FAILURE, b'\x00\x00\x00\x02\x00\x00\x00\x03' + common.NS( b'unknown channel') + common.NS(b''))]) self.transport.packets = [] self.conn.ssh_CHANNEL_OPEN(common.NS(b'ErrorChannel') + b'\x00\x00\x00\x02' * 4) self.flushLoggedErrors() self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_OPEN_FAILURE, b'\x00\x00\x00\x02\x00\x00\x00\x02' + common.NS( b'unknown failure') + common.NS(b''))]) def _lookupChannelErrorTest(self, code): """ Deliver a request for a channel open which will result in an exception being raised during channel lookup. Assert that an error response is delivered as a result. """ self.transport.avatar._ARGS_ERROR_CODE = code self.conn.ssh_CHANNEL_OPEN( common.NS(b'conch-error-args') + b'\x00\x00\x00\x01' * 4) errors = self.flushLoggedErrors(error.ConchError) self.assertEqual( len(errors), 1, "Expected one error, got: %r" % (errors,)) self.assertEqual(errors[0].value.args, (long(123), "error args in wrong order")) self.assertEqual( self.transport.packets, [(connection.MSG_CHANNEL_OPEN_FAILURE, # The response includes some bytes which identifying the # associated request, as well as the error code (7b in hex) and # the error message. b'\x00\x00\x00\x01\x00\x00\x00\x7b' + common.NS( b'error args in wrong order') + common.NS(b''))]) def test_lookupChannelError(self): """ If a C{lookupChannel} implementation raises L{error.ConchError} with the arguments in the wrong order, a C{MSG_CHANNEL_OPEN} failure is still sent in response to the message. This is a temporary work-around until L{error.ConchError} is given better attributes and all of the Conch code starts constructing instances of it properly. Eventually this functionality should be deprecated and then removed. """ self._lookupChannelErrorTest(123) def test_lookupChannelErrorLongCode(self): """ Like L{test_lookupChannelError}, but for the case where the failure code is represented as a L{long} instead of a L{int}. """ self._lookupChannelErrorTest(long(123)) def test_CHANNEL_OPEN_CONFIRMATION(self): """ Test that channel open confirmation packets cause the channel to be notified that it's open. """ channel = TestChannel() self.conn.openChannel(channel) self.conn.ssh_CHANNEL_OPEN_CONFIRMATION(b'\x00\x00\x00\x00'*5) self.assertEqual(channel.remoteWindowLeft, 0) self.assertEqual(channel.remoteMaxPacket, 0) self.assertEqual(channel.specificData, b'\x00\x00\x00\x00') self.assertEqual(self.conn.channelsToRemoteChannel[channel], 0) self.assertEqual(self.conn.localToRemoteChannel[0], 0) def test_CHANNEL_OPEN_FAILURE(self): """ Test that channel open failure packets cause the channel to be notified that its opening failed. """ channel = TestChannel() self.conn.openChannel(channel) self.conn.ssh_CHANNEL_OPEN_FAILURE(b'\x00\x00\x00\x00\x00\x00\x00' b'\x01' + common.NS(b'failure!')) self.assertEqual(channel.openFailureReason.args, (b'failure!', 1)) self.assertIsNone(self.conn.channels.get(channel)) def test_CHANNEL_WINDOW_ADJUST(self): """ Test that channel window adjust messages add bytes to the channel window. """ channel = TestChannel() self._openChannel(channel) oldWindowSize = channel.remoteWindowLeft self.conn.ssh_CHANNEL_WINDOW_ADJUST(b'\x00\x00\x00\x00\x00\x00\x00' b'\x01') self.assertEqual(channel.remoteWindowLeft, oldWindowSize + 1) def test_CHANNEL_DATA(self): """ Test that channel data messages are passed up to the channel, or cause the channel to be closed if the data is too large. """ channel = TestChannel(localWindow=6, localMaxPacket=5) self._openChannel(channel) self.conn.ssh_CHANNEL_DATA(b'\x00\x00\x00\x00' + common.NS(b'data')) self.assertEqual(channel.inBuffer, [b'data']) self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_WINDOW_ADJUST, b'\x00\x00\x00\xff' b'\x00\x00\x00\x04')]) self.transport.packets = [] longData = b'a' * (channel.localWindowLeft + 1) self.conn.ssh_CHANNEL_DATA(b'\x00\x00\x00\x00' + common.NS(longData)) self.assertEqual(channel.inBuffer, [b'data']) self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_CLOSE, b'\x00\x00\x00\xff')]) channel = TestChannel() self._openChannel(channel) bigData = b'a' * (channel.localMaxPacket + 1) self.transport.packets = [] self.conn.ssh_CHANNEL_DATA(b'\x00\x00\x00\x01' + common.NS(bigData)) self.assertEqual(channel.inBuffer, []) self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_CLOSE, b'\x00\x00\x00\xff')]) def test_CHANNEL_EXTENDED_DATA(self): """ Test that channel extended data messages are passed up to the channel, or cause the channel to be closed if they're too big. """ channel = TestChannel(localWindow=6, localMaxPacket=5) self._openChannel(channel) self.conn.ssh_CHANNEL_EXTENDED_DATA(b'\x00\x00\x00\x00\x00\x00\x00' b'\x00' + common.NS(b'data')) self.assertEqual(channel.extBuffer, [(0, b'data')]) self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_WINDOW_ADJUST, b'\x00\x00\x00\xff' b'\x00\x00\x00\x04')]) self.transport.packets = [] longData = b'a' * (channel.localWindowLeft + 1) self.conn.ssh_CHANNEL_EXTENDED_DATA(b'\x00\x00\x00\x00\x00\x00\x00' b'\x00' + common.NS(longData)) self.assertEqual(channel.extBuffer, [(0, b'data')]) self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_CLOSE, b'\x00\x00\x00\xff')]) channel = TestChannel() self._openChannel(channel) bigData = b'a' * (channel.localMaxPacket + 1) self.transport.packets = [] self.conn.ssh_CHANNEL_EXTENDED_DATA(b'\x00\x00\x00\x01\x00\x00\x00' b'\x00' + common.NS(bigData)) self.assertEqual(channel.extBuffer, []) self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_CLOSE, b'\x00\x00\x00\xff')]) def test_CHANNEL_EOF(self): """ Test that channel eof messages are passed up to the channel. """ channel = TestChannel() self._openChannel(channel) self.conn.ssh_CHANNEL_EOF(b'\x00\x00\x00\x00') self.assertTrue(channel.gotEOF) def test_CHANNEL_CLOSE(self): """ Test that channel close messages are passed up to the channel. Also, test that channel.close() is called if both sides are closed when this message is received. """ channel = TestChannel() self._openChannel(channel) self.conn.sendClose(channel) self.conn.ssh_CHANNEL_CLOSE(b'\x00\x00\x00\x00') self.assertTrue(channel.gotOneClose) self.assertTrue(channel.gotClosed) def test_CHANNEL_REQUEST_success(self): """ Test that channel requests that succeed send MSG_CHANNEL_SUCCESS. """ channel = TestChannel() self._openChannel(channel) self.conn.ssh_CHANNEL_REQUEST(b'\x00\x00\x00\x00' + common.NS(b'test') + b'\x00') self.assertEqual(channel.numberRequests, 1) d = self.conn.ssh_CHANNEL_REQUEST(b'\x00\x00\x00\x00' + common.NS( b'test') + b'\xff' + b'data') def check(result): self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_SUCCESS, b'\x00\x00\x00\xff')]) d.addCallback(check) return d def test_CHANNEL_REQUEST_failure(self): """ Test that channel requests that fail send MSG_CHANNEL_FAILURE. """ channel = TestChannel() self._openChannel(channel) d = self.conn.ssh_CHANNEL_REQUEST(b'\x00\x00\x00\x00' + common.NS( b'test') + b'\xff') def check(result): self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_FAILURE, b'\x00\x00\x00\xff' )]) d.addCallback(self.fail) d.addErrback(check) return d def test_CHANNEL_REQUEST_SUCCESS(self): """ Test that channel request success messages cause the Deferred to be called back. """ channel = TestChannel() self._openChannel(channel) d = self.conn.sendRequest(channel, b'test', b'data', True) self.conn.ssh_CHANNEL_SUCCESS(b'\x00\x00\x00\x00') def check(result): self.assertTrue(result) return d def test_CHANNEL_REQUEST_FAILURE(self): """ Test that channel request failure messages cause the Deferred to be erred back. """ channel = TestChannel() self._openChannel(channel) d = self.conn.sendRequest(channel, b'test', b'', True) self.conn.ssh_CHANNEL_FAILURE(b'\x00\x00\x00\x00') def check(result): self.assertEqual(result.value.value, 'channel request failed') d.addCallback(self.fail) d.addErrback(check) return d def test_sendGlobalRequest(self): """ Test that global request messages are sent in the right format. """ d = self.conn.sendGlobalRequest(b'wantReply', b'data', True) # must be added to prevent errbacking during teardown d.addErrback(lambda failure: None) self.conn.sendGlobalRequest(b'noReply', b'', False) self.assertEqual(self.transport.packets, [(connection.MSG_GLOBAL_REQUEST, common.NS(b'wantReply') + b'\xffdata'), (connection.MSG_GLOBAL_REQUEST, common.NS(b'noReply') + b'\x00')]) self.assertEqual(self.conn.deferreds, {'global':[d]}) def test_openChannel(self): """ Test that open channel messages are sent in the right format. """ channel = TestChannel() self.conn.openChannel(channel, b'aaaa') self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_OPEN, common.NS(b'TestChannel') + b'\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x80\x00aaaa')]) self.assertEqual(channel.id, 0) self.assertEqual(self.conn.localChannelID, 1) def test_sendRequest(self): """ Test that channel request messages are sent in the right format. """ channel = TestChannel() self._openChannel(channel) d = self.conn.sendRequest(channel, b'test', b'test', True) # needed to prevent errbacks during teardown. d.addErrback(lambda failure: None) self.conn.sendRequest(channel, b'test2', b'', False) channel.localClosed = True # emulate sending a close message self.conn.sendRequest(channel, b'test3', b'', True) self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_REQUEST, b'\x00\x00\x00\xff' + common.NS(b'test') + b'\x01test'), (connection.MSG_CHANNEL_REQUEST, b'\x00\x00\x00\xff' + common.NS(b'test2') + b'\x00')]) self.assertEqual(self.conn.deferreds[0], [d]) def test_adjustWindow(self): """ Test that channel window adjust messages cause bytes to be added to the window. """ channel = TestChannel(localWindow=5) self._openChannel(channel) channel.localWindowLeft = 0 self.conn.adjustWindow(channel, 1) self.assertEqual(channel.localWindowLeft, 1) channel.localClosed = True self.conn.adjustWindow(channel, 2) self.assertEqual(channel.localWindowLeft, 1) self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_WINDOW_ADJUST, b'\x00\x00\x00\xff' b'\x00\x00\x00\x01')]) def test_sendData(self): """ Test that channel data messages are sent in the right format. """ channel = TestChannel() self._openChannel(channel) self.conn.sendData(channel, b'a') channel.localClosed = True self.conn.sendData(channel, b'b') self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_DATA, b'\x00\x00\x00\xff' + common.NS(b'a'))]) def test_sendExtendedData(self): """ Test that channel extended data messages are sent in the right format. """ channel = TestChannel() self._openChannel(channel) self.conn.sendExtendedData(channel, 1, b'test') channel.localClosed = True self.conn.sendExtendedData(channel, 2, b'test2') self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_EXTENDED_DATA, b'\x00\x00\x00\xff' + b'\x00\x00\x00\x01' + common.NS(b'test'))]) def test_sendEOF(self): """ Test that channel EOF messages are sent in the right format. """ channel = TestChannel() self._openChannel(channel) self.conn.sendEOF(channel) self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_EOF, b'\x00\x00\x00\xff')]) channel.localClosed = True self.conn.sendEOF(channel) self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_EOF, b'\x00\x00\x00\xff')]) def test_sendClose(self): """ Test that channel close messages are sent in the right format. """ channel = TestChannel() self._openChannel(channel) self.conn.sendClose(channel) self.assertTrue(channel.localClosed) self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_CLOSE, b'\x00\x00\x00\xff')]) self.conn.sendClose(channel) self.assertEqual(self.transport.packets, [(connection.MSG_CHANNEL_CLOSE, b'\x00\x00\x00\xff')]) channel2 = TestChannel() self._openChannel(channel2) channel2.remoteClosed = True self.conn.sendClose(channel2) self.assertTrue(channel2.gotClosed) def test_getChannelWithAvatar(self): """ Test that getChannel dispatches to the avatar when an avatar is present. Correct functioning without the avatar is verified in test_CHANNEL_OPEN. """ channel = self.conn.getChannel(b'TestChannel', 50, 30, b'data') self.assertEqual(channel.data, b'data') self.assertEqual(channel.remoteWindowLeft, 50) self.assertEqual(channel.remoteMaxPacket, 30) self.assertRaises(error.ConchError, self.conn.getChannel, b'BadChannel', 50, 30, b'data') def test_gotGlobalRequestWithoutAvatar(self): """ Test that gotGlobalRequests dispatches to global_* without an avatar. """ del self.transport.avatar self.assertTrue(self.conn.gotGlobalRequest(b'TestGlobal', b'data')) self.assertEqual(self.conn.gotGlobalRequest(b'Test-Data', b'data'), (True, b'data')) self.assertFalse(self.conn.gotGlobalRequest(b'BadGlobal', b'data')) def test_channelClosedCausesLeftoverChannelDeferredsToErrback(self): """ Whenever an SSH channel gets closed any Deferred that was returned by a sendRequest() on its parent connection must be errbacked. """ channel = TestChannel() self._openChannel(channel) d = self.conn.sendRequest( channel, b"dummyrequest", b"dummydata", wantReply=1) d = self.assertFailure(d, error.ConchError) self.conn.channelClosed(channel) return d class CleanConnectionShutdownTests(unittest.TestCase): """ Check whether correct cleanup is performed on connection shutdown. """ if not cryptography: skip = "Cannot run without cryptography" if test_userauth.transport is None: skip = "Cannot run without both cryptography and pyasn1" def setUp(self): self.transport = test_userauth.FakeTransport(None) self.transport.avatar = TestAvatar() self.conn = TestConnection() self.conn.transport = self.transport def test_serviceStoppedCausesLeftoverGlobalDeferredsToErrback(self): """ Once the service is stopped any leftover global deferred returned by a sendGlobalRequest() call must be errbacked. """ self.conn.serviceStarted() d = self.conn.sendGlobalRequest( b"dummyrequest", b"dummydata", wantReply=1) d = self.assertFailure(d, error.ConchError) self.conn.serviceStopped() return d