Current File : //lib/python3/dist-packages/twisted/conch/test/test_ssh.py
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Tests for L{twisted.conch.ssh}.
"""
import struct
from twisted.conch.test.keydata import (
privateDSA_openssh,
privateRSA_openssh,
publicDSA_openssh,
publicRSA_openssh,
)
from twisted.conch.test.loopback import LoopbackRelay
from twisted.cred import portal
from twisted.cred.error import UnauthorizedLogin
from twisted.internet import defer, protocol, reactor
from twisted.internet.error import ProcessTerminated
from twisted.python import failure, log
from twisted.python.reflect import requireModule
from twisted.trial import unittest
cryptography = requireModule("cryptography")
pyasn1 = requireModule("pyasn1")
if cryptography:
from twisted.conch import avatar, error
from twisted.conch.ssh import _kex, common, forwarding, session
else:
class avatar: # type: ignore[no-redef]
class ConchUser:
pass
class ConchTestRealm:
"""
A realm which expects a particular avatarId to log in once and creates a
L{ConchTestAvatar} for that request.
@ivar expectedAvatarID: The only avatarID that this realm will produce an
avatar for.
@ivar avatar: A reference to the avatar after it is requested.
"""
avatar = None
def __init__(self, expectedAvatarID):
self.expectedAvatarID = expectedAvatarID
def requestAvatar(self, avatarID, mind, *interfaces):
"""
Return a new L{ConchTestAvatar} if the avatarID matches the expected one
and this is the first avatar request.
"""
if avatarID == self.expectedAvatarID:
if self.avatar is not None:
raise UnauthorizedLogin("Only one login allowed")
self.avatar = ConchTestAvatar()
return interfaces[0], self.avatar, self.avatar.logout
raise UnauthorizedLogin(
f"Only {self.expectedAvatarID!r} may log in, not {avatarID!r}"
)
class ConchTestAvatar(avatar.ConchUser):
"""
An avatar against which various SSH features can be tested.
@ivar loggedOut: A flag indicating whether the avatar logout method has been
called.
"""
if not cryptography:
skip = "cannot run without cryptography"
loggedOut = False
def __init__(self):
avatar.ConchUser.__init__(self)
self.listeners = {}
self.globalRequests = {}
self.channelLookup.update(
{
b"session": session.SSHSession,
b"direct-tcpip": forwarding.openConnectForwardingClient,
}
)
self.subsystemLookup.update({b"crazy": CrazySubsystem})
def global_foo(self, data):
self.globalRequests["foo"] = data
return 1
def global_foo_2(self, data):
self.globalRequests["foo_2"] = data
return 1, b"data"
def global_tcpip_forward(self, data):
host, port = forwarding.unpackGlobal_tcpip_forward(data)
try:
listener = reactor.listenTCP(
port,
forwarding.SSHListenForwardingFactory(
self.conn, (host, port), forwarding.SSHListenServerForwardingChannel
),
interface=host,
)
except BaseException:
log.err(None, "something went wrong with remote->local forwarding")
return 0
else:
self.listeners[(host, port)] = listener
return 1
def global_cancel_tcpip_forward(self, data):
host, port = forwarding.unpackGlobal_tcpip_forward(data)
listener = self.listeners.get((host, port), None)
if not listener:
return 0
del self.listeners[(host, port)]
listener.stopListening()
return 1
def logout(self):
self.loggedOut = True
for listener in self.listeners.values():
log.msg("stopListening %s" % listener)
listener.stopListening()
class ConchSessionForTestAvatar:
"""
An ISession adapter for ConchTestAvatar.
"""
def __init__(self, avatar):
"""
Initialize the session and create a reference to it on the avatar for
later inspection.
"""
self.avatar = avatar
self.avatar._testSession = self
self.cmd = None
self.proto = None
self.ptyReq = False
self.eof = 0
self.onClose = defer.Deferred()
def getPty(self, term, windowSize, attrs):
log.msg("pty req")
self._terminalType = term
self._windowSize = windowSize
self.ptyReq = True
def openShell(self, proto):
log.msg("opening shell")
self.proto = proto
EchoTransport(proto)
self.cmd = b"shell"
def execCommand(self, proto, cmd):
self.cmd = cmd
self.proto = proto
f = cmd.split()[0]
if f == b"false":
t = FalseTransport(proto)
# Avoid disconnecting this immediately. If the channel is closed
# before execCommand even returns the caller gets confused.
reactor.callLater(0, t.loseConnection)
elif f == b"echo":
t = EchoTransport(proto)
t.write(cmd[5:])
t.loseConnection()
elif f == b"secho":
t = SuperEchoTransport(proto)
t.write(cmd[6:])
t.loseConnection()
elif f == b"eecho":
t = ErrEchoTransport(proto)
t.write(cmd[6:])
t.loseConnection()
else:
raise error.ConchError("bad exec")
self.avatar.conn.transport.expectedLoseConnection = 1
def eofReceived(self):
self.eof = 1
def closed(self):
log.msg('closed cmd "%s"' % self.cmd)
self.remoteWindowLeftAtClose = self.proto.session.remoteWindowLeft
self.onClose.callback(None)
from twisted.python import components
if cryptography:
components.registerAdapter(
ConchSessionForTestAvatar, ConchTestAvatar, session.ISession
)
class CrazySubsystem(protocol.Protocol):
def __init__(self, *args, **kw):
pass
def connectionMade(self):
"""
good ... good
"""
class FalseTransport:
"""
False transport should act like a /bin/false execution, i.e. just exit with
nonzero status, writing nothing to the terminal.
@ivar proto: The protocol associated with this transport.
@ivar closed: A flag tracking whether C{loseConnection} has been called yet.
"""
def __init__(self, p):
"""
@type p L{twisted.conch.ssh.session.SSHSessionProcessProtocol} instance
"""
self.proto = p
p.makeConnection(self)
self.closed = 0
def loseConnection(self):
"""
Disconnect the protocol associated with this transport.
"""
if self.closed:
return
self.closed = 1
self.proto.inConnectionLost()
self.proto.outConnectionLost()
self.proto.errConnectionLost()
self.proto.processEnded(failure.Failure(ProcessTerminated(255, None, None)))
class EchoTransport:
def __init__(self, p):
self.proto = p
p.makeConnection(self)
self.closed = 0
def write(self, data):
log.msg(repr(data))
self.proto.outReceived(data)
self.proto.outReceived(b"\r\n")
if b"\x00" in data: # mimic 'exit' for the shell test
self.loseConnection()
def loseConnection(self):
if self.closed:
return
self.closed = 1
self.proto.inConnectionLost()
self.proto.outConnectionLost()
self.proto.errConnectionLost()
self.proto.processEnded(failure.Failure(ProcessTerminated(0, None, None)))
class ErrEchoTransport:
def __init__(self, p):
self.proto = p
p.makeConnection(self)
self.closed = 0
def write(self, data):
self.proto.errReceived(data)
self.proto.errReceived(b"\r\n")
def loseConnection(self):
if self.closed:
return
self.closed = 1
self.proto.inConnectionLost()
self.proto.outConnectionLost()
self.proto.errConnectionLost()
self.proto.processEnded(failure.Failure(ProcessTerminated(0, None, None)))
class SuperEchoTransport:
def __init__(self, p):
self.proto = p
p.makeConnection(self)
self.closed = 0
def write(self, data):
self.proto.outReceived(data)
self.proto.outReceived(b"\r\n")
self.proto.errReceived(data)
self.proto.errReceived(b"\r\n")
def loseConnection(self):
if self.closed:
return
self.closed = 1
self.proto.inConnectionLost()
self.proto.outConnectionLost()
self.proto.errConnectionLost()
self.proto.processEnded(failure.Failure(ProcessTerminated(0, None, None)))
if cryptography is not None and pyasn1 is not None:
from twisted.conch import checkers
from twisted.conch.ssh import (
channel,
connection,
factory,
keys,
transport,
userauth,
)
class ConchTestPasswordChecker:
credentialInterfaces = (checkers.IUsernamePassword,)
def requestAvatarId(self, credentials):
if (
credentials.username == b"testuser"
and credentials.password == b"testpass"
):
return defer.succeed(credentials.username)
return defer.fail(Exception("Bad credentials"))
class ConchTestSSHChecker(checkers.SSHProtocolChecker):
def areDone(self, avatarId):
if avatarId != b"testuser" or len(self.successfulCredentials[avatarId]) < 2:
return False
return True
class ConchTestServerFactory(factory.SSHFactory):
noisy = False
services = {
b"ssh-userauth": userauth.SSHUserAuthServer,
b"ssh-connection": connection.SSHConnection,
}
def buildProtocol(self, addr):
proto = ConchTestServer()
proto.supportedPublicKeys = self.privateKeys.keys()
proto.factory = self
if hasattr(self, "expectedLoseConnection"):
proto.expectedLoseConnection = self.expectedLoseConnection
self.proto = proto
return proto
def getPublicKeys(self):
return {
b"ssh-rsa": keys.Key.fromString(publicRSA_openssh),
b"ssh-dss": keys.Key.fromString(publicDSA_openssh),
}
def getPrivateKeys(self):
return {
b"ssh-rsa": keys.Key.fromString(privateRSA_openssh),
b"ssh-dss": keys.Key.fromString(privateDSA_openssh),
}
def getPrimes(self):
"""
Diffie-Hellman primes that can be used for the
diffie-hellman-group-exchange-sha1 key exchange.
@return: The primes and generators.
@rtype: L{dict} mapping the key size to a C{list} of
C{(generator, prime)} tupple.
"""
# In these tests, we hardwire the prime values to those defined by
# the diffie-hellman-group14-sha1 key exchange algorithm, to avoid
# requiring a moduli file when running tests.
# See OpenSSHFactory.getPrimes.
return {2048: [_kex.getDHGeneratorAndPrime(b"diffie-hellman-group14-sha1")]}
def getService(self, trans, name):
return factory.SSHFactory.getService(self, trans, name)
class ConchTestBase:
done = 0
def connectionLost(self, reason):
if self.done:
return
if not hasattr(self, "expectedLoseConnection"):
raise unittest.FailTest(
f"unexpectedly lost connection {self}\n{reason}"
)
self.done = 1
def receiveError(self, reasonCode, desc):
self.expectedLoseConnection = 1
# Some versions of OpenSSH (for example, OpenSSH_5.3p1) will
# send a DISCONNECT_BY_APPLICATION error before closing the
# connection. Other, older versions (for example,
# OpenSSH_5.1p1), won't. So accept this particular error here,
# but no others.
if reasonCode != transport.DISCONNECT_BY_APPLICATION:
log.err(
Exception(
"got disconnect for %s: reason %s, desc: %s"
% (self, reasonCode, desc)
)
)
self.loseConnection()
def receiveUnimplemented(self, seqID):
raise unittest.FailTest(f"got unimplemented: seqid {seqID}")
class ConchTestServer(ConchTestBase, transport.SSHServerTransport):
def connectionLost(self, reason):
ConchTestBase.connectionLost(self, reason)
transport.SSHServerTransport.connectionLost(self, reason)
class ConchTestClient(ConchTestBase, transport.SSHClientTransport):
"""
@ivar _channelFactory: A callable which accepts an SSH connection and
returns a channel which will be attached to a new channel on that
connection.
"""
def __init__(self, channelFactory):
self._channelFactory = channelFactory
def connectionLost(self, reason):
ConchTestBase.connectionLost(self, reason)
transport.SSHClientTransport.connectionLost(self, reason)
def verifyHostKey(self, key, fp):
keyMatch = key == keys.Key.fromString(publicRSA_openssh).blob()
fingerprintMatch = fp == b"85:25:04:32:58:55:96:9f:57:ee:fb:a8:1a:ea:69:da"
if keyMatch and fingerprintMatch:
return defer.succeed(1)
return defer.fail(Exception("Key or fingerprint mismatch"))
def connectionSecure(self):
self.requestService(
ConchTestClientAuth(
b"testuser", ConchTestClientConnection(self._channelFactory)
)
)
class ConchTestClientAuth(userauth.SSHUserAuthClient):
hasTriedNone = 0 # have we tried the 'none' auth yet?
canSucceedPublicKey = 0 # can we succeed with this yet?
canSucceedPassword = 0
def ssh_USERAUTH_SUCCESS(self, packet):
if not self.canSucceedPassword and self.canSucceedPublicKey:
raise unittest.FailTest(
"got USERAUTH_SUCCESS before password and publickey"
)
userauth.SSHUserAuthClient.ssh_USERAUTH_SUCCESS(self, packet)
def getPassword(self):
self.canSucceedPassword = 1
return defer.succeed(b"testpass")
def getPrivateKey(self):
self.canSucceedPublicKey = 1
return defer.succeed(keys.Key.fromString(privateDSA_openssh))
def getPublicKey(self):
return keys.Key.fromString(publicDSA_openssh)
class ConchTestClientConnection(connection.SSHConnection):
"""
@ivar _completed: A L{Deferred} which will be fired when the number of
results collected reaches C{totalResults}.
"""
name = b"ssh-connection"
results = 0
totalResults = 8
def __init__(self, channelFactory):
connection.SSHConnection.__init__(self)
self._channelFactory = channelFactory
def serviceStarted(self):
self.openChannel(self._channelFactory(conn=self))
class SSHTestChannel(channel.SSHChannel):
def __init__(self, name, opened, *args, **kwargs):
self.name = name
self._opened = opened
self.received = []
self.receivedExt = []
self.onClose = defer.Deferred()
channel.SSHChannel.__init__(self, *args, **kwargs)
def openFailed(self, reason):
self._opened.errback(reason)
def channelOpen(self, ignore):
self._opened.callback(self)
def dataReceived(self, data):
self.received.append(data)
def extReceived(self, dataType, data):
if dataType == connection.EXTENDED_DATA_STDERR:
self.receivedExt.append(data)
else:
log.msg(f"Unrecognized extended data: {dataType!r}")
def request_exit_status(self, status):
[self.status] = struct.unpack(">L", status)
def eofReceived(self):
self.eofCalled = True
def closed(self):
self.onClose.callback(None)
def conchTestPublicKeyChecker():
"""
Produces a SSHPublicKeyChecker with an in-memory key mapping with
a single use: 'testuser'
@return: L{twisted.conch.checkers.SSHPublicKeyChecker}
"""
conchTestPublicKeyDB = checkers.InMemorySSHKeyDB(
{b"testuser": [keys.Key.fromString(publicDSA_openssh)]}
)
return checkers.SSHPublicKeyChecker(conchTestPublicKeyDB)
class SSHProtocolTests(unittest.TestCase):
"""
Tests for communication between L{SSHServerTransport} and
L{SSHClientTransport}.
"""
if not cryptography:
skip = "can't run without cryptography"
if not pyasn1:
skip = "Cannot run without PyASN1"
def _ourServerOurClientTest(self, name=b"session", **kwargs):
"""
Create a connected SSH client and server protocol pair and return a
L{Deferred} which fires with an L{SSHTestChannel} instance connected to
a channel on that SSH connection.
"""
result = defer.Deferred()
self.realm = ConchTestRealm(b"testuser")
p = portal.Portal(self.realm)
sshpc = ConchTestSSHChecker()
sshpc.registerChecker(ConchTestPasswordChecker())
sshpc.registerChecker(conchTestPublicKeyChecker())
p.registerChecker(sshpc)
fac = ConchTestServerFactory()
fac.portal = p
fac.startFactory()
self.server = fac.buildProtocol(None)
self.clientTransport = LoopbackRelay(self.server)
self.client = ConchTestClient(
lambda conn: SSHTestChannel(name, result, conn=conn, **kwargs)
)
self.serverTransport = LoopbackRelay(self.client)
self.server.makeConnection(self.serverTransport)
self.client.makeConnection(self.clientTransport)
return result
def test_subsystemsAndGlobalRequests(self):
"""
Run the Conch server against the Conch client. Set up several different
channels which exercise different behaviors and wait for them to
complete. Verify that the channels with errors log them.
"""
channel = self._ourServerOurClientTest()
def cbSubsystem(channel):
self.channel = channel
return self.assertFailure(
channel.conn.sendRequest(
channel, b"subsystem", common.NS(b"not-crazy"), 1
),
Exception,
)
channel.addCallback(cbSubsystem)
def cbNotCrazyFailed(ignored):
channel = self.channel
return channel.conn.sendRequest(
channel, b"subsystem", common.NS(b"crazy"), 1
)
channel.addCallback(cbNotCrazyFailed)
def cbGlobalRequests(ignored):
channel = self.channel
d1 = channel.conn.sendGlobalRequest(b"foo", b"bar", 1)
d2 = channel.conn.sendGlobalRequest(b"foo-2", b"bar2", 1)
d2.addCallback(self.assertEqual, b"data")
d3 = self.assertFailure(
channel.conn.sendGlobalRequest(b"bar", b"foo", 1), Exception
)
return defer.gatherResults([d1, d2, d3])
channel.addCallback(cbGlobalRequests)
def disconnect(ignored):
self.assertEqual(
self.realm.avatar.globalRequests, {"foo": b"bar", "foo_2": b"bar2"}
)
channel = self.channel
channel.conn.transport.expectedLoseConnection = True
channel.conn.serviceStopped()
channel.loseConnection()
channel.addCallback(disconnect)
return channel
def test_shell(self):
"""
L{SSHChannel.sendRequest} can open a shell with a I{pty-req} request,
specifying a terminal type and window size.
"""
channel = self._ourServerOurClientTest()
data = session.packRequest_pty_req(b"conch-test-term", (24, 80, 0, 0), b"")
def cbChannel(channel):
self.channel = channel
return channel.conn.sendRequest(channel, b"pty-req", data, 1)
channel.addCallback(cbChannel)
def cbPty(ignored):
# The server-side object corresponding to our client side channel.
session = self.realm.avatar.conn.channels[0].session
self.assertIs(session.avatar, self.realm.avatar)
self.assertEqual(session._terminalType, b"conch-test-term")
self.assertEqual(session._windowSize, (24, 80, 0, 0))
self.assertTrue(session.ptyReq)
channel = self.channel
return channel.conn.sendRequest(channel, b"shell", b"", 1)
channel.addCallback(cbPty)
def cbShell(ignored):
self.channel.write(b"testing the shell!\x00")
self.channel.conn.sendEOF(self.channel)
return defer.gatherResults(
[self.channel.onClose, self.realm.avatar._testSession.onClose]
)
channel.addCallback(cbShell)
def cbExited(ignored):
if self.channel.status != 0:
log.msg("shell exit status was not 0: %i" % (self.channel.status,))
self.assertEqual(
b"".join(self.channel.received), b"testing the shell!\x00\r\n"
)
self.assertTrue(self.channel.eofCalled)
self.assertTrue(self.realm.avatar._testSession.eof)
channel.addCallback(cbExited)
return channel
def test_failedExec(self):
"""
If L{SSHChannel.sendRequest} issues an exec which the server responds to
with an error, the L{Deferred} it returns fires its errback.
"""
channel = self._ourServerOurClientTest()
def cbChannel(channel):
self.channel = channel
return self.assertFailure(
channel.conn.sendRequest(channel, b"exec", common.NS(b"jumboliah"), 1),
Exception,
)
channel.addCallback(cbChannel)
def cbFailed(ignored):
# The server logs this exception when it cannot perform the
# requested exec.
errors = self.flushLoggedErrors(error.ConchError)
self.assertEqual(errors[0].value.args, ("bad exec", None))
channel.addCallback(cbFailed)
return channel
def test_falseChannel(self):
"""
When the process started by a L{SSHChannel.sendRequest} exec request
exits, the exit status is reported to the channel.
"""
channel = self._ourServerOurClientTest()
def cbChannel(channel):
self.channel = channel
return channel.conn.sendRequest(channel, b"exec", common.NS(b"false"), 1)
channel.addCallback(cbChannel)
def cbExec(ignored):
return self.channel.onClose
channel.addCallback(cbExec)
def cbClosed(ignored):
# No data is expected
self.assertEqual(self.channel.received, [])
self.assertNotEqual(self.channel.status, 0)
channel.addCallback(cbClosed)
return channel
def test_errorChannel(self):
"""
Bytes sent over the extended channel for stderr data are delivered to
the channel's C{extReceived} method.
"""
channel = self._ourServerOurClientTest(localWindow=4, localMaxPacket=5)
def cbChannel(channel):
self.channel = channel
return channel.conn.sendRequest(
channel, b"exec", common.NS(b"eecho hello"), 1
)
channel.addCallback(cbChannel)
def cbExec(ignored):
return defer.gatherResults(
[self.channel.onClose, self.realm.avatar._testSession.onClose]
)
channel.addCallback(cbExec)
def cbClosed(ignored):
self.assertEqual(self.channel.received, [])
self.assertEqual(b"".join(self.channel.receivedExt), b"hello\r\n")
self.assertEqual(self.channel.status, 0)
self.assertTrue(self.channel.eofCalled)
self.assertEqual(self.channel.localWindowLeft, 4)
self.assertEqual(
self.channel.localWindowLeft,
self.realm.avatar._testSession.remoteWindowLeftAtClose,
)
channel.addCallback(cbClosed)
return channel
def test_unknownChannel(self):
"""
When an attempt is made to open an unknown channel type, the L{Deferred}
returned by L{SSHChannel.sendRequest} fires its errback.
"""
d = self.assertFailure(
self._ourServerOurClientTest(b"crazy-unknown-channel"), Exception
)
def cbFailed(ignored):
errors = self.flushLoggedErrors(error.ConchError)
self.assertEqual(errors[0].value.args, (3, "unknown channel"))
self.assertEqual(len(errors), 1)
d.addCallback(cbFailed)
return d
def test_maxPacket(self):
"""
An L{SSHChannel} can be configured with a maximum packet size to
receive.
"""
# localWindow needs to be at least 11 otherwise the assertion about it
# in cbClosed is invalid.
channel = self._ourServerOurClientTest(localWindow=11, localMaxPacket=1)
def cbChannel(channel):
self.channel = channel
return channel.conn.sendRequest(
channel, b"exec", common.NS(b"secho hello"), 1
)
channel.addCallback(cbChannel)
def cbExec(ignored):
return self.channel.onClose
channel.addCallback(cbExec)
def cbClosed(ignored):
self.assertEqual(self.channel.status, 0)
self.assertEqual(b"".join(self.channel.received), b"hello\r\n")
self.assertEqual(b"".join(self.channel.receivedExt), b"hello\r\n")
self.assertEqual(self.channel.localWindowLeft, 11)
self.assertTrue(self.channel.eofCalled)
channel.addCallback(cbClosed)
return channel
def test_echo(self):
"""
Normal standard out bytes are sent to the channel's C{dataReceived}
method.
"""
channel = self._ourServerOurClientTest(localWindow=4, localMaxPacket=5)
def cbChannel(channel):
self.channel = channel
return channel.conn.sendRequest(
channel, b"exec", common.NS(b"echo hello"), 1
)
channel.addCallback(cbChannel)
def cbEcho(ignored):
return defer.gatherResults(
[self.channel.onClose, self.realm.avatar._testSession.onClose]
)
channel.addCallback(cbEcho)
def cbClosed(ignored):
self.assertEqual(self.channel.status, 0)
self.assertEqual(b"".join(self.channel.received), b"hello\r\n")
self.assertEqual(self.channel.localWindowLeft, 4)
self.assertTrue(self.channel.eofCalled)
self.assertEqual(
self.channel.localWindowLeft,
self.realm.avatar._testSession.remoteWindowLeftAtClose,
)
channel.addCallback(cbClosed)
return channel
class SSHFactoryTests(unittest.TestCase):
if not cryptography:
skip = "can't run without cryptography"
if not pyasn1:
skip = "Cannot run without PyASN1"
def makeSSHFactory(self, primes=None):
sshFactory = factory.SSHFactory()
gpk = lambda: {"ssh-rsa": keys.Key(None)}
sshFactory.getPrimes = lambda: primes
sshFactory.getPublicKeys = sshFactory.getPrivateKeys = gpk
sshFactory.startFactory()
return sshFactory
def test_buildProtocol(self):
"""
By default, buildProtocol() constructs an instance of
SSHServerTransport.
"""
factory = self.makeSSHFactory()
protocol = factory.buildProtocol(None)
self.assertIsInstance(protocol, transport.SSHServerTransport)
def test_buildProtocolRespectsProtocol(self):
"""
buildProtocol() calls 'self.protocol()' to construct a protocol
instance.
"""
calls = []
def makeProtocol(*args):
calls.append(args)
return transport.SSHServerTransport()
factory = self.makeSSHFactory()
factory.protocol = makeProtocol
factory.buildProtocol(None)
self.assertEqual([()], calls)
def test_buildProtocolNoPrimes(self):
"""
Group key exchanges are not supported when we don't have the primes
database.
"""
f1 = self.makeSSHFactory(primes=None)
p1 = f1.buildProtocol(None)
self.assertNotIn(
b"diffie-hellman-group-exchange-sha1", p1.supportedKeyExchanges
)
self.assertNotIn(
b"diffie-hellman-group-exchange-sha256", p1.supportedKeyExchanges
)
def test_buildProtocolWithPrimes(self):
"""
Group key exchanges are supported when we have the primes database.
"""
f2 = self.makeSSHFactory(primes={1: (2, 3)})
p2 = f2.buildProtocol(None)
self.assertIn(b"diffie-hellman-group-exchange-sha1", p2.supportedKeyExchanges)
self.assertIn(b"diffie-hellman-group-exchange-sha256", p2.supportedKeyExchanges)
def test_buildProtocolKexECDSA(self):
"""
ECDSA key exchanges are listed with 256 having a higher priority among ECDSA.
"""
f2 = self.makeSSHFactory()
p2 = f2.buildProtocol(None)
# The list might contain other algorightm.
# For this test just check the order for ECDSA KEX.
self.assertIn(
b"ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521",
b",".join(p2.supportedKeyExchanges),
)
class MPTests(unittest.TestCase):
"""
Tests for L{common.getMP}.
@cvar getMP: a method providing a MP parser.
@type getMP: C{callable}
"""
if not cryptography:
skip = "can't run without cryptography"
if not pyasn1:
skip = "Cannot run without PyASN1"
if cryptography:
getMP = staticmethod(common.getMP)
def test_getMP(self):
"""
L{common.getMP} should parse the a multiple precision integer from a
string: a 4-byte length followed by length bytes of the integer.
"""
self.assertEqual(self.getMP(b"\x00\x00\x00\x04\x00\x00\x00\x01"), (1, b""))
def test_getMPBigInteger(self):
"""
L{common.getMP} should be able to parse a big enough integer
(that doesn't fit on one byte).
"""
self.assertEqual(
self.getMP(b"\x00\x00\x00\x04\x01\x02\x03\x04"), (16909060, b"")
)
def test_multipleGetMP(self):
"""
L{common.getMP} has the ability to parse multiple integer in the same
string.
"""
self.assertEqual(
self.getMP(
b"\x00\x00\x00\x04\x00\x00\x00\x01" b"\x00\x00\x00\x04\x00\x00\x00\x02",
2,
),
(1, 2, b""),
)
def test_getMPRemainingData(self):
"""
When more data than needed is sent to L{common.getMP}, it should return
the remaining data.
"""
self.assertEqual(
self.getMP(b"\x00\x00\x00\x04\x00\x00\x00\x01foo"), (1, b"foo")
)
def test_notEnoughData(self):
"""
When the string passed to L{common.getMP} doesn't even make 5 bytes,
it should raise a L{struct.error}.
"""
self.assertRaises(struct.error, self.getMP, b"\x02\x00")
class GMPYInstallDeprecationTests(unittest.TestCase):
"""
Tests for the deprecation of former GMPY accidental public API.
"""
if not cryptography:
skip = "cannot run without cryptography"
def test_deprecated(self):
"""
L{twisted.conch.ssh.common.install} is deprecated.
"""
common.install()
warnings = self.flushWarnings([self.test_deprecated])
self.assertEqual(len(warnings), 1)
self.assertEqual(
warnings[0]["message"],
"twisted.conch.ssh.common.install was deprecated in Twisted 16.5.0",
)
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