def test_1_write(self):
rsock = LoopSocket()
wsock = LoopSocket()
rsock.link(wsock)
p = Packetizer(wsock)
p.set_log(util.get_logger('paramiko.transport'))
p.set_hexdump(True)
encryptor = Cipher(
algorithms.AES(zero_byte * 16),
modes.CBC(x55 * 16),
backend=default_backend()
).encryptor()
p.set_outbound_cipher(encryptor, 16, sha1, 12, x1f * 20)
# message has to be at least 16 bytes long, so we'll have at least one
# block of data encrypted that contains zero random padding bytes
m = Message()
m.add_byte(byte_chr(100))
m.add_int(100)
m.add_int(1)
m.add_int(900)
p.send_message(m)
data = rsock.recv(100)
# 32 + 12 bytes of MAC = 44
self.assertEqual(44, len(data))
self.assertEqual(b'\x43\x91\x97\xbd\x5b\x50\xac\x25\x87\xc2\xc4\x6b\xc7\xe9\x38\xc0', data[:16])
def test_3_closed(self):
if sys.platform.startswith("win"): # no SIGALRM on windows
return
rsock = LoopSocket()
wsock = LoopSocket()
rsock.link(wsock)
p = Packetizer(wsock)
p.set_log(util.get_logger('paramiko.transport'))
p.set_hexdump(True)
encryptor = Cipher(
algorithms.AES(zero_byte * 16),
modes.CBC(x55 * 16),
backend=default_backend()
).encryptor()
p.set_outbound_cipher(encryptor, 16, sha1, 12, x1f * 20)
# message has to be at least 16 bytes long, so we'll have at least one
# block of data encrypted that contains zero random padding bytes
m = Message()
m.add_byte(byte_chr(100))
m.add_int(100)
m.add_int(1)
m.add_int(900)
wsock.send = lambda x: 0
from functools import wraps
import errno
import os
import signal
class TimeoutError(Exception):
def __init__(self, error_message):
if hasattr(errno, 'ETIME'):
self.message = os.sterror(errno.ETIME)
else:
self.messaage = error_message
def timeout(seconds=1, error_message='Timer expired'):
def decorator(func):
def _handle_timeout(signum, frame):
raise TimeoutError(error_message)
def wrapper(*args, **kwargs):
signal.signal(signal.SIGALRM, _handle_timeout)
signal.alarm(seconds)
try:
result = func(*args, **kwargs)
finally:
signal.alarm(0)
return result
return wraps(func)(wrapper)
return decorator
send = timeout()(p.send_message)
self.assertRaises(EOFError, send, m)
def test_3_closed(self):
rsock = LoopSocket()
wsock = LoopSocket()
rsock.link(wsock)
p = Packetizer(wsock)
p.set_log(util.get_logger('paramiko.transport'))
p.set_hexdump(True)
cipher = AES.new(zero_byte * 16, AES.MODE_CBC, x55 * 16)
p.set_outbound_cipher(cipher, 16, sha1, 12, x1f * 20)
# message has to be at least 16 bytes long, so we'll have at least one
# block of data encrypted that contains zero random padding bytes
m = Message()
m.add_byte(byte_chr(100))
m.add_int(100)
m.add_int(1)
m.add_int(900)
wsock.send = lambda x: 0
from functools import wraps
import errno
import os
import signal
class TimeoutError(Exception):
pass
def timeout(seconds=1, error_message=os.strerror(errno.ETIME)):
def decorator(func):
def _handle_timeout(signum, frame):
raise TimeoutError(error_message)
def wrapper(*args, **kwargs):
signal.signal(signal.SIGALRM, _handle_timeout)
signal.alarm(seconds)
try:
result = func(*args, **kwargs)
finally:
signal.alarm(0)
return result
return wraps(func)(wrapper)
return decorator
send = timeout()(p.send_message)
self.assertRaises(EOFError, send, m)
def init_loopback():
global sftp, tc
socks = LoopSocket()
sockc = LoopSocket()
sockc.link(socks)
tc = paramiko.Transport(sockc)
ts = paramiko.Transport(socks)
host_key = paramiko.RSAKey.from_private_key_file(test_path("test_rsa.key"))
ts.add_server_key(host_key)
event = threading.Event()
server = StubServer()
ts.set_subsystem_handler("sftp", paramiko.SFTPServer, StubSFTPServer)
ts.start_server(event, server)
tc.connect(username="******", password="******")
event.wait(1.0)
sftp = paramiko.SFTP.from_transport(tc)
def init_loopback():
global sftp, tc
socks = LoopSocket()
sockc = LoopSocket()
sockc.link(socks)
tc = paramiko.Transport(sockc)
ts = paramiko.Transport(socks)
host_key = paramiko.RSAKey.from_private_key_file(test_path('test_rsa.key'))
ts.add_server_key(host_key)
event = threading.Event()
server = StubServer()
ts.set_subsystem_handler('sftp', paramiko.SFTPServer, StubSFTPServer)
ts.start_server(event, server)
tc.connect(username='******', password='******')
event.wait(1.0)
sftp = paramiko.SFTP.from_transport(tc)
def test_1_write(self):
rsock = LoopSocket()
wsock = LoopSocket()
rsock.link(wsock)
p = Packetizer(wsock)
p.set_log(util.get_logger('paramiko.transport'))
p.set_hexdump(True)
encryptor = Cipher(algorithms.AES(zero_byte * 16),
modes.CBC(x55 * 16),
backend=default_backend()).encryptor()
p.set_outbound_cipher(encryptor, 16, sha1, 12, x1f * 20)
# message has to be at least 16 bytes long, so we'll have at least one
# block of data encrypted that contains zero random padding bytes
m = Message()
m.add_byte(byte_chr(100))
m.add_int(100)
m.add_int(1)
m.add_int(900)
p.send_message(m)
data = rsock.recv(100)
# 32 + 12 bytes of MAC = 44
self.assertEqual(44, len(data))
self.assertEqual(
b'\x43\x91\x97\xbd\x5b\x50\xac\x25\x87\xc2\xc4\x6b\xc7\xe9\x38\xc0',
data[:16])
def test_3_closed(self):
if sys.platform.startswith("win"): # no SIGALRM on windows
return
rsock = LoopSocket()
wsock = LoopSocket()
rsock.link(wsock)
p = Packetizer(wsock)
p.set_log(util.get_logger('paramiko.transport'))
p.set_hexdump(True)
encryptor = Cipher(algorithms.AES(zero_byte * 16),
modes.CBC(x55 * 16),
backend=default_backend()).encryptor()
p.set_outbound_cipher(encryptor, 16, sha1, 12, x1f * 20)
# message has to be at least 16 bytes long, so we'll have at least one
# block of data encrypted that contains zero random padding bytes
m = Message()
m.add_byte(byte_chr(100))
m.add_int(100)
m.add_int(1)
m.add_int(900)
wsock.send = lambda x: 0
from functools import wraps
import errno
import os
import signal
class TimeoutError(Exception):
def __init__(self, error_message):
if hasattr(errno, 'ETIME'):
self.message = os.sterror(errno.ETIME)
else:
self.messaage = error_message
def timeout(seconds=1, error_message='Timer expired'):
def decorator(func):
def _handle_timeout(signum, frame):
raise TimeoutError(error_message)
def wrapper(*args, **kwargs):
signal.signal(signal.SIGALRM, _handle_timeout)
signal.alarm(seconds)
try:
result = func(*args, **kwargs)
finally:
signal.alarm(0)
return result
return wraps(func)(wrapper)
return decorator
send = timeout()(p.send_message)
self.assertRaises(EOFError, send, m)
def test_2_read(self):
rsock = LoopSocket()
wsock = LoopSocket()
rsock.link(wsock)
p = Packetizer(rsock)
p.set_log(util.get_logger('paramiko.transport'))
p.set_hexdump(True)
cipher = AES.new(zero_byte * 16, AES.MODE_CBC, x55 * 16)
p.set_inbound_cipher(cipher, 16, SHA, 12, x1f * 20)
wsock.send(
b'\x43\x91\x97\xbd\x5b\x50\xac\x25\x87\xc2\xc4\x6b\xc7\xe9\x38\xc0\x90\xd2\x16\x56\x0d\x71\x73\x61\x38\x7c\x4c\x3d\xfb\x97\x7d\xe2\x6e\x03\xb1\xa0\xc2\x1c\xd6\x41\x41\x4c\xb4\x59'
)
cmd, m = p.read_message()
self.assertEqual(100, cmd)
self.assertEqual(100, m.get_int())
self.assertEqual(1, m.get_int())
self.assertEqual(900, m.get_int())
def test_2_read(self):
rsock = LoopSocket()
wsock = LoopSocket()
rsock.link(wsock)
p = Packetizer(rsock)
p.set_log(util.get_logger('paramiko.transport'))
p.set_hexdump(True)
decryptor = Cipher(algorithms.AES(zero_byte * 16),
modes.CBC(x55 * 16),
backend=default_backend()).decryptor()
p.set_inbound_cipher(decryptor, 16, sha1, 12, x1f * 20)
wsock.send(
b'\x43\x91\x97\xbd\x5b\x50\xac\x25\x87\xc2\xc4\x6b\xc7\xe9\x38\xc0\x90\xd2\x16\x56\x0d\x71\x73\x61\x38\x7c\x4c\x3d\xfb\x97\x7d\xe2\x6e\x03\xb1\xa0\xc2\x1c\xd6\x41\x41\x4c\xb4\x59'
)
cmd, m = p.read_message()
self.assertEqual(100, cmd)
self.assertEqual(100, m.get_int())
self.assertEqual(1, m.get_int())
self.assertEqual(900, m.get_int())
def test_3_closed(self):
rsock = LoopSocket()
wsock = LoopSocket()
rsock.link(wsock)
p = Packetizer(wsock)
p.set_log(util.get_logger('paramiko.transport'))
p.set_hexdump(True)
cipher = AES.new(zero_byte * 16, AES.MODE_CBC, x55 * 16)
p.set_outbound_cipher(cipher, 16, sha1, 12, x1f * 20)
# message has to be at least 16 bytes long, so we'll have at least one
# block of data encrypted that contains zero random padding bytes
m = Message()
m.add_byte(byte_chr(100))
m.add_int(100)
m.add_int(1)
m.add_int(900)
wsock.send = lambda x: 0
from functools import wraps
import errno
import os
import signal
class TimeoutError(Exception):
pass
def timeout(seconds=1, error_message=os.strerror(errno.ETIME)):
def decorator(func):
def _handle_timeout(signum, frame):
raise TimeoutError(error_message)
def wrapper(*args, **kwargs):
signal.signal(signal.SIGALRM, _handle_timeout)
signal.alarm(seconds)
try:
result = func(*args, **kwargs)
finally:
signal.alarm(0)
return result
return wraps(func)(wrapper)
return decorator
send = timeout()(p.send_message)
self.assertRaises(EOFError, send, m)
def test_2_read(self):
rsock = LoopSocket()
wsock = LoopSocket()
rsock.link(wsock)
p = Packetizer(rsock)
p.set_log(util.get_logger('paramiko.transport'))
p.set_hexdump(True)
cipher = AES.new(zero_byte * 16, AES.MODE_CBC, x55 * 16)
p.set_inbound_cipher(cipher, 16, sha1, 12, x1f * 20)
wsock.send(b'\x43\x91\x97\xbd\x5b\x50\xac\x25\x87\xc2\xc4\x6b\xc7\xe9\x38\xc0\x90\xd2\x16\x56\x0d\x71\x73\x61\x38\x7c\x4c\x3d\xfb\x97\x7d\xe2\x6e\x03\xb1\xa0\xc2\x1c\xd6\x41\x41\x4c\xb4\x59')
cmd, m = p.read_message()
self.assertEqual(100, cmd)
self.assertEqual(100, m.get_int())
self.assertEqual(1, m.get_int())
self.assertEqual(900, m.get_int())
def test_2_read(self):
rsock = LoopSocket()
wsock = LoopSocket()
rsock.link(wsock)
p = Packetizer(rsock)
p.set_log(util.get_logger("paramiko.transport"))
p.set_hexdump(True)
decryptor = Cipher(algorithms.AES(zero_byte * 16), modes.CBC(x55 * 16), backend=default_backend()).decryptor()
p.set_inbound_cipher(decryptor, 16, sha1, 12, x1f * 20)
wsock.send(
b"\x43\x91\x97\xbd\x5b\x50\xac\x25\x87\xc2\xc4\x6b\xc7\xe9\x38\xc0\x90\xd2\x16\x56\x0d\x71\x73\x61\x38\x7c\x4c\x3d\xfb\x97\x7d\xe2\x6e\x03\xb1\xa0\xc2\x1c\xd6\x41\x41\x4c\xb4\x59"
)
cmd, m = p.read_message()
self.assertEqual(100, cmd)
self.assertEqual(100, m.get_int())
self.assertEqual(1, m.get_int())
self.assertEqual(900, m.get_int())
class TransportTest(unittest.TestCase):
def setUp(self):
self.socks = LoopSocket()
self.sockc = LoopSocket()
self.sockc.link(self.socks)
self.tc = Transport(self.sockc)
self.ts = Transport(self.socks)
def tearDown(self):
self.tc.close()
self.ts.close()
self.socks.close()
self.sockc.close()
def setup_test_server(self, client_options=None, server_options=None):
host_key = RSAKey.from_private_key_file(test_path('test_rsa.key'))
public_host_key = RSAKey(data=host_key.asbytes())
self.ts.add_server_key(host_key)
if client_options is not None:
client_options(self.tc.get_security_options())
if server_options is not None:
server_options(self.ts.get_security_options())
event = threading.Event()
self.server = NullServer()
self.assertTrue(not event.is_set())
self.ts.start_server(event, self.server)
self.tc.connect(hostkey=public_host_key,
username='******',
password='******')
event.wait(1.0)
self.assertTrue(event.is_set())
self.assertTrue(self.ts.is_active())
def test_1_security_options(self):
o = self.tc.get_security_options()
self.assertEqual(type(o), SecurityOptions)
self.assertTrue(('aes256-cbc', 'blowfish-cbc') != o.ciphers)
o.ciphers = ('aes256-cbc', 'blowfish-cbc')
self.assertEqual(('aes256-cbc', 'blowfish-cbc'), o.ciphers)
try:
o.ciphers = ('aes256-cbc', 'made-up-cipher')
self.assertTrue(False)
except ValueError:
pass
try:
o.ciphers = 23
self.assertTrue(False)
except TypeError:
pass
def test_2_compute_key(self):
self.tc.K = 123281095979686581523377256114209720774539068973101330872763622971399429481072519713536292772709507296759612401802191955568143056534122385270077606457721553469730659233569339356140085284052436697480759510519672848743794433460113118986816826624865291116513647975790797391795651716378444844877749505443714557929
self.tc.H = b'\x0C\x83\x07\xCD\xE6\x85\x6F\xF3\x0B\xA9\x36\x84\xEB\x0F\x04\xC2\x52\x0E\x9E\xD3'
self.tc.session_id = self.tc.H
key = self.tc._compute_key('C', 32)
self.assertEqual(
b'207E66594CA87C44ECCBA3B3CD39FDDB378E6FDB0F97C54B2AA0CFBF900CD995',
hexlify(key).upper())
def test_3_simple(self):
"""
verify that we can establish an ssh link with ourselves across the
loopback sockets. this is hardly "simple" but it's simpler than the
later tests. :)
"""
host_key = RSAKey.from_private_key_file(test_path('test_rsa.key'))
public_host_key = RSAKey(data=host_key.asbytes())
self.ts.add_server_key(host_key)
event = threading.Event()
server = NullServer()
self.assertTrue(not event.is_set())
self.assertEqual(None, self.tc.get_username())
self.assertEqual(None, self.ts.get_username())
self.assertEqual(False, self.tc.is_authenticated())
self.assertEqual(False, self.ts.is_authenticated())
self.ts.start_server(event, server)
self.tc.connect(hostkey=public_host_key,
username='******',
password='******')
event.wait(1.0)
self.assertTrue(event.is_set())
self.assertTrue(self.ts.is_active())
self.assertEqual('slowdive', self.tc.get_username())
self.assertEqual('slowdive', self.ts.get_username())
self.assertEqual(True, self.tc.is_authenticated())
self.assertEqual(True, self.ts.is_authenticated())
def test_3a_long_banner(self):
"""
verify that a long banner doesn't mess up the handshake.
"""
host_key = RSAKey.from_private_key_file(test_path('test_rsa.key'))
public_host_key = RSAKey(data=host_key.asbytes())
self.ts.add_server_key(host_key)
event = threading.Event()
server = NullServer()
self.assertTrue(not event.is_set())
self.socks.send(LONG_BANNER)
self.ts.start_server(event, server)
self.tc.connect(hostkey=public_host_key,
username='******',
password='******')
event.wait(1.0)
self.assertTrue(event.is_set())
self.assertTrue(self.ts.is_active())
def test_4_special(self):
"""
verify that the client can demand odd handshake settings, and can
renegotiate keys in mid-stream.
"""
def force_algorithms(options):
options.ciphers = ('aes256-cbc', )
options.digests = ('hmac-md5-96', )
self.setup_test_server(client_options=force_algorithms)
self.assertEqual('aes256-cbc', self.tc.local_cipher)
self.assertEqual('aes256-cbc', self.tc.remote_cipher)
self.assertEqual(12, self.tc.packetizer.get_mac_size_out())
self.assertEqual(12, self.tc.packetizer.get_mac_size_in())
self.tc.send_ignore(1024)
self.tc.renegotiate_keys()
self.ts.send_ignore(1024)
def test_5_keepalive(self):
"""
verify that the keepalive will be sent.
"""
self.setup_test_server()
self.assertEqual(None, getattr(self.server, '_global_request', None))
self.tc.set_keepalive(1)
time.sleep(2)
self.assertEqual('*****@*****.**', self.server._global_request)
def test_6_exec_command(self):
"""
verify that exec_command() does something reasonable.
"""
self.setup_test_server()
chan = self.tc.open_session()
schan = self.ts.accept(1.0)
try:
chan.exec_command('no')
self.assertTrue(False)
except SSHException:
pass
chan = self.tc.open_session()
chan.exec_command('yes')
schan = self.ts.accept(1.0)
schan.send('Hello there.\n')
schan.send_stderr('This is on stderr.\n')
schan.close()
f = chan.makefile()
self.assertEqual('Hello there.\n', f.readline())
self.assertEqual('', f.readline())
f = chan.makefile_stderr()
self.assertEqual('This is on stderr.\n', f.readline())
self.assertEqual('', f.readline())
# now try it with combined stdout/stderr
chan = self.tc.open_session()
chan.exec_command('yes')
schan = self.ts.accept(1.0)
schan.send('Hello there.\n')
schan.send_stderr('This is on stderr.\n')
schan.close()
chan.set_combine_stderr(True)
f = chan.makefile()
self.assertEqual('Hello there.\n', f.readline())
self.assertEqual('This is on stderr.\n', f.readline())
self.assertEqual('', f.readline())
def test_6a_channel_can_be_used_as_context_manager(self):
"""
verify that exec_command() does something reasonable.
"""
self.setup_test_server()
with self.tc.open_session() as chan:
with self.ts.accept(1.0) as schan:
chan.exec_command('yes')
schan.send('Hello there.\n')
schan.close()
f = chan.makefile()
self.assertEqual('Hello there.\n', f.readline())
self.assertEqual('', f.readline())
def test_7_invoke_shell(self):
"""
verify that invoke_shell() does something reasonable.
"""
self.setup_test_server()
chan = self.tc.open_session()
chan.invoke_shell()
schan = self.ts.accept(1.0)
chan.send('communist j. cat\n')
f = schan.makefile()
self.assertEqual('communist j. cat\n', f.readline())
chan.close()
self.assertEqual('', f.readline())
def test_8_channel_exception(self):
"""
verify that ChannelException is thrown for a bad open-channel request.
"""
self.setup_test_server()
try:
chan = self.tc.open_channel('bogus')
self.fail('expected exception')
except ChannelException as e:
self.assertTrue(e.code == OPEN_FAILED_ADMINISTRATIVELY_PROHIBITED)
def test_9_exit_status(self):
"""
verify that get_exit_status() works.
"""
self.setup_test_server()
chan = self.tc.open_session()
schan = self.ts.accept(1.0)
chan.exec_command('yes')
schan.send('Hello there.\n')
self.assertTrue(not chan.exit_status_ready())
# trigger an EOF
schan.shutdown_read()
schan.shutdown_write()
schan.send_exit_status(23)
schan.close()
f = chan.makefile()
self.assertEqual('Hello there.\n', f.readline())
self.assertEqual('', f.readline())
count = 0
while not chan.exit_status_ready():
time.sleep(0.1)
count += 1
if count > 50:
raise Exception("timeout")
self.assertEqual(23, chan.recv_exit_status())
chan.close()
def test_A_select(self):
"""
verify that select() on a channel works.
"""
self.setup_test_server()
chan = self.tc.open_session()
chan.invoke_shell()
schan = self.ts.accept(1.0)
# nothing should be ready
r, w, e = select.select([chan], [], [], 0.1)
self.assertEqual([], r)
self.assertEqual([], w)
self.assertEqual([], e)
schan.send('hello\n')
# something should be ready now (give it 1 second to appear)
for i in range(10):
r, w, e = select.select([chan], [], [], 0.1)
if chan in r:
break
time.sleep(0.1)
self.assertEqual([chan], r)
self.assertEqual([], w)
self.assertEqual([], e)
self.assertEqual(b'hello\n', chan.recv(6))
# and, should be dead again now
r, w, e = select.select([chan], [], [], 0.1)
self.assertEqual([], r)
self.assertEqual([], w)
self.assertEqual([], e)
schan.close()
# detect eof?
for i in range(10):
r, w, e = select.select([chan], [], [], 0.1)
if chan in r:
break
time.sleep(0.1)
self.assertEqual([chan], r)
self.assertEqual([], w)
self.assertEqual([], e)
self.assertEqual(bytes(), chan.recv(16))
# make sure the pipe is still open for now...
p = chan._pipe
self.assertEqual(False, p._closed)
chan.close()
# ...and now is closed.
self.assertEqual(True, p._closed)
def test_B_renegotiate(self):
"""
verify that a transport can correctly renegotiate mid-stream.
"""
self.setup_test_server()
self.tc.packetizer.REKEY_BYTES = 16384
chan = self.tc.open_session()
chan.exec_command('yes')
schan = self.ts.accept(1.0)
self.assertEqual(self.tc.H, self.tc.session_id)
for i in range(20):
chan.send('x' * 1024)
chan.close()
# allow a few seconds for the rekeying to complete
for i in range(50):
if self.tc.H != self.tc.session_id:
break
time.sleep(0.1)
self.assertNotEqual(self.tc.H, self.tc.session_id)
schan.close()
def test_C_compression(self):
"""
verify that zlib compression is basically working.
"""
def force_compression(o):
o.compression = ('zlib', )
self.setup_test_server(force_compression, force_compression)
chan = self.tc.open_session()
chan.exec_command('yes')
schan = self.ts.accept(1.0)
bytes = self.tc.packetizer._Packetizer__sent_bytes
chan.send('x' * 1024)
bytes2 = self.tc.packetizer._Packetizer__sent_bytes
# tests show this is actually compressed to *52 bytes*! including packet overhead! nice!! :)
self.assertTrue(bytes2 - bytes < 1024)
self.assertEqual(52, bytes2 - bytes)
chan.close()
schan.close()
def test_D_x11(self):
"""
verify that an x11 port can be requested and opened.
"""
self.setup_test_server()
chan = self.tc.open_session()
chan.exec_command('yes')
schan = self.ts.accept(1.0)
requested = []
def handler(c, addr_port):
addr, port = addr_port
requested.append((addr, port))
self.tc._queue_incoming_channel(c)
self.assertEqual(None, getattr(self.server, '_x11_screen_number',
None))
cookie = chan.request_x11(0, single_connection=True, handler=handler)
self.assertEqual(0, self.server._x11_screen_number)
self.assertEqual('MIT-MAGIC-COOKIE-1', self.server._x11_auth_protocol)
self.assertEqual(cookie, self.server._x11_auth_cookie)
self.assertEqual(True, self.server._x11_single_connection)
x11_server = self.ts.open_x11_channel(('localhost', 6093))
x11_client = self.tc.accept()
self.assertEqual('localhost', requested[0][0])
self.assertEqual(6093, requested[0][1])
x11_server.send('hello')
self.assertEqual(b'hello', x11_client.recv(5))
x11_server.close()
x11_client.close()
chan.close()
schan.close()
def test_E_reverse_port_forwarding(self):
"""
verify that a client can ask the server to open a reverse port for
forwarding.
"""
self.setup_test_server()
chan = self.tc.open_session()
chan.exec_command('yes')
schan = self.ts.accept(1.0)
requested = []
def handler(c, origin_addr_port, server_addr_port):
requested.append(origin_addr_port)
requested.append(server_addr_port)
self.tc._queue_incoming_channel(c)
port = self.tc.request_port_forward('127.0.0.1', 0, handler)
self.assertEqual(port, self.server._listen.getsockname()[1])
cs = socket.socket()
cs.connect(('127.0.0.1', port))
ss, _ = self.server._listen.accept()
sch = self.ts.open_forwarded_tcpip_channel(ss.getsockname(),
ss.getpeername())
cch = self.tc.accept()
sch.send('hello')
self.assertEqual(b'hello', cch.recv(5))
sch.close()
cch.close()
ss.close()
cs.close()
# now cancel it.
self.tc.cancel_port_forward('127.0.0.1', port)
self.assertTrue(self.server._listen is None)
def test_F_port_forwarding(self):
"""
verify that a client can forward new connections from a locally-
forwarded port.
"""
self.setup_test_server()
chan = self.tc.open_session()
chan.exec_command('yes')
schan = self.ts.accept(1.0)
# open a port on the "server" that the client will ask to forward to.
greeting_server = socket.socket()
greeting_server.bind(('127.0.0.1', 0))
greeting_server.listen(1)
greeting_port = greeting_server.getsockname()[1]
cs = self.tc.open_channel('direct-tcpip', ('127.0.0.1', greeting_port),
('', 9000))
sch = self.ts.accept(1.0)
cch = socket.socket()
cch.connect(self.server._tcpip_dest)
ss, _ = greeting_server.accept()
ss.send(b'Hello!\n')
ss.close()
sch.send(cch.recv(8192))
sch.close()
self.assertEqual(b'Hello!\n', cs.recv(7))
cs.close()
def test_G_stderr_select(self):
"""
verify that select() on a channel works even if only stderr is
receiving data.
"""
self.setup_test_server()
chan = self.tc.open_session()
chan.invoke_shell()
schan = self.ts.accept(1.0)
# nothing should be ready
r, w, e = select.select([chan], [], [], 0.1)
self.assertEqual([], r)
self.assertEqual([], w)
self.assertEqual([], e)
schan.send_stderr('hello\n')
# something should be ready now (give it 1 second to appear)
for i in range(10):
r, w, e = select.select([chan], [], [], 0.1)
if chan in r:
break
time.sleep(0.1)
self.assertEqual([chan], r)
self.assertEqual([], w)
self.assertEqual([], e)
self.assertEqual(b'hello\n', chan.recv_stderr(6))
# and, should be dead again now
r, w, e = select.select([chan], [], [], 0.1)
self.assertEqual([], r)
self.assertEqual([], w)
self.assertEqual([], e)
schan.close()
chan.close()
def test_H_send_ready(self):
"""
verify that send_ready() indicates when a send would not block.
"""
self.setup_test_server()
chan = self.tc.open_session()
chan.invoke_shell()
schan = self.ts.accept(1.0)
self.assertEqual(chan.send_ready(), True)
total = 0
K = '*' * 1024
limit = 1 + (64 * 2**15)
while total < limit:
chan.send(K)
total += len(K)
if not chan.send_ready():
break
self.assertTrue(total < limit)
schan.close()
chan.close()
self.assertEqual(chan.send_ready(), True)
def test_I_rekey_deadlock(self):
"""
Regression test for deadlock when in-transit messages are received after MSG_KEXINIT is sent
Note: When this test fails, it may leak threads.
"""
# Test for an obscure deadlocking bug that can occur if we receive
# certain messages while initiating a key exchange.
#
# The deadlock occurs as follows:
#
# In the main thread:
# 1. The user's program calls Channel.send(), which sends
# MSG_CHANNEL_DATA to the remote host.
# 2. Packetizer discovers that REKEY_BYTES has been exceeded, and
# sets the __need_rekey flag.
#
# In the Transport thread:
# 3. Packetizer notices that the __need_rekey flag is set, and raises
# NeedRekeyException.
# 4. In response to NeedRekeyException, the transport thread sends
# MSG_KEXINIT to the remote host.
#
# On the remote host (using any SSH implementation):
# 5. The MSG_CHANNEL_DATA is received, and MSG_CHANNEL_WINDOW_ADJUST is sent.
# 6. The MSG_KEXINIT is received, and a corresponding MSG_KEXINIT is sent.
#
# In the main thread:
# 7. The user's program calls Channel.send().
# 8. Channel.send acquires Channel.lock, then calls Transport._send_user_message().
# 9. Transport._send_user_message waits for Transport.clear_to_send
# to be set (i.e., it waits for re-keying to complete).
# Channel.lock is still held.
#
# In the Transport thread:
# 10. MSG_CHANNEL_WINDOW_ADJUST is received; Channel._window_adjust
# is called to handle it.
# 11. Channel._window_adjust tries to acquire Channel.lock, but it
# blocks because the lock is already held by the main thread.
#
# The result is that the Transport thread never processes the remote
# host's MSG_KEXINIT packet, because it becomes deadlocked while
# handling the preceding MSG_CHANNEL_WINDOW_ADJUST message.
# We set up two separate threads for sending and receiving packets,
# while the main thread acts as a watchdog timer. If the timer
# expires, a deadlock is assumed.
class SendThread(threading.Thread):
def __init__(self, chan, iterations, done_event):
threading.Thread.__init__(self, None, None,
self.__class__.__name__)
self.setDaemon(True)
self.chan = chan
self.iterations = iterations
self.done_event = done_event
self.watchdog_event = threading.Event()
self.last = None
def run(self):
try:
for i in range(1, 1 + self.iterations):
if self.done_event.is_set():
break
self.watchdog_event.set()
#print i, "SEND"
self.chan.send("x" * 2048)
finally:
self.done_event.set()
self.watchdog_event.set()
class ReceiveThread(threading.Thread):
def __init__(self, chan, done_event):
threading.Thread.__init__(self, None, None,
self.__class__.__name__)
self.setDaemon(True)
self.chan = chan
self.done_event = done_event
self.watchdog_event = threading.Event()
def run(self):
try:
while not self.done_event.is_set():
if self.chan.recv_ready():
chan.recv(65536)
self.watchdog_event.set()
else:
if random.randint(0, 1):
time.sleep(random.randint(0, 500) / 1000.0)
finally:
self.done_event.set()
self.watchdog_event.set()
self.setup_test_server()
self.ts.packetizer.REKEY_BYTES = 2048
chan = self.tc.open_session()
chan.exec_command('yes')
schan = self.ts.accept(1.0)
# Monkey patch the client's Transport._handler_table so that the client
# sends MSG_CHANNEL_WINDOW_ADJUST whenever it receives an initial
# MSG_KEXINIT. This is used to simulate the effect of network latency
# on a real MSG_CHANNEL_WINDOW_ADJUST message.
self.tc._handler_table = self.tc._handler_table.copy(
) # copy per-class dictionary
_negotiate_keys = self.tc._handler_table[MSG_KEXINIT]
def _negotiate_keys_wrapper(self, m):
if self.local_kex_init is None: # Remote side sent KEXINIT
# Simulate in-transit MSG_CHANNEL_WINDOW_ADJUST by sending it
# before responding to the incoming MSG_KEXINIT.
m2 = Message()
m2.add_byte(cMSG_CHANNEL_WINDOW_ADJUST)
m2.add_int(chan.remote_chanid)
m2.add_int(1) # bytes to add
self._send_message(m2)
return _negotiate_keys(self, m)
self.tc._handler_table[MSG_KEXINIT] = _negotiate_keys_wrapper
# Parameters for the test
iterations = 500 # The deadlock does not happen every time, but it
# should after many iterations.
timeout = 5
# This event is set when the test is completed
done_event = threading.Event()
# Start the sending thread
st = SendThread(schan, iterations, done_event)
st.start()
# Start the receiving thread
rt = ReceiveThread(chan, done_event)
rt.start()
# Act as a watchdog timer, checking
deadlocked = False
while not deadlocked and not done_event.is_set():
for event in (st.watchdog_event, rt.watchdog_event):
event.wait(timeout)
if done_event.is_set():
break
if not event.is_set():
deadlocked = True
break
event.clear()
# Tell the threads to stop (if they haven't already stopped). Note
# that if one or more threads are deadlocked, they might hang around
# forever (until the process exits).
done_event.set()
# Assertion: We must not have detected a timeout.
self.assertFalse(deadlocked)
# Close the channels
schan.close()
chan.close()
def test_J_sanitze_packet_size(self):
"""
verify that we conform to the rfc of packet and window sizes.
"""
for val, correct in [(4095, MIN_PACKET_SIZE),
(None, DEFAULT_MAX_PACKET_SIZE),
(2**32, MAX_WINDOW_SIZE)]:
self.assertEqual(self.tc._sanitize_packet_size(val), correct)
def test_K_sanitze_window_size(self):
"""
verify that we conform to the rfc of packet and window sizes.
"""
for val, correct in [(32767, MIN_WINDOW_SIZE),
(None, DEFAULT_WINDOW_SIZE),
(2**32, MAX_WINDOW_SIZE)]:
self.assertEqual(self.tc._sanitize_window_size(val), correct)
def test_L_handshake_timeout(self):
"""
verify that we can get a hanshake timeout.
"""
host_key = RSAKey.from_private_key_file(test_path('test_rsa.key'))
public_host_key = RSAKey(data=host_key.asbytes())
self.ts.add_server_key(host_key)
event = threading.Event()
server = NullServer()
self.assertTrue(not event.is_set())
self.tc.handshake_timeout = 0.000000000001
self.ts.start_server(event, server)
self.assertRaises(EOFError,
self.tc.connect,
hostkey=public_host_key,
username='******',
password='******')
def setUp(self):
self.socks = LoopSocket()
self.sockc = LoopSocket()
self.sockc.link(self.socks)
self.tc = Transport(self.sockc)
self.ts = Transport(self.socks)
class TransportTest(unittest.TestCase):
def setUp(self):
self.socks = LoopSocket()
self.sockc = LoopSocket()
self.sockc.link(self.socks)
self.tc = Transport(self.sockc)
self.ts = Transport(self.socks)
def tearDown(self):
self.tc.close()
self.ts.close()
self.socks.close()
self.sockc.close()
def setup_test_server(self, client_options=None, server_options=None):
host_key = RSAKey.from_private_key_file(test_path('test_rsa.key'))
public_host_key = RSAKey(data=host_key.asbytes())
self.ts.add_server_key(host_key)
if client_options is not None:
client_options(self.tc.get_security_options())
if server_options is not None:
server_options(self.ts.get_security_options())
event = threading.Event()
self.server = NullServer()
self.assertTrue(not event.is_set())
self.ts.start_server(event, self.server)
self.tc.connect(hostkey=public_host_key,
username='******', password='******')
event.wait(1.0)
self.assertTrue(event.is_set())
self.assertTrue(self.ts.is_active())
def test_1_security_options(self):
o = self.tc.get_security_options()
self.assertEqual(type(o), SecurityOptions)
self.assertTrue(('aes256-cbc', 'blowfish-cbc') != o.ciphers)
o.ciphers = ('aes256-cbc', 'blowfish-cbc')
self.assertEqual(('aes256-cbc', 'blowfish-cbc'), o.ciphers)
try:
o.ciphers = ('aes256-cbc', 'made-up-cipher')
self.assertTrue(False)
except ValueError:
pass
try:
o.ciphers = 23
self.assertTrue(False)
except TypeError:
pass
def test_2_compute_key(self):
self.tc.K = 123281095979686581523377256114209720774539068973101330872763622971399429481072519713536292772709507296759612401802191955568143056534122385270077606457721553469730659233569339356140085284052436697480759510519672848743794433460113118986816826624865291116513647975790797391795651716378444844877749505443714557929
self.tc.H = b'\x0C\x83\x07\xCD\xE6\x85\x6F\xF3\x0B\xA9\x36\x84\xEB\x0F\x04\xC2\x52\x0E\x9E\xD3'
self.tc.session_id = self.tc.H
key = self.tc._compute_key('C', 32)
self.assertEqual(b'207E66594CA87C44ECCBA3B3CD39FDDB378E6FDB0F97C54B2AA0CFBF900CD995',
hexlify(key).upper())
def test_3_simple(self):
"""
verify that we can establish an ssh link with ourselves across the
loopback sockets. this is hardly "simple" but it's simpler than the
later tests. :)
"""
host_key = RSAKey.from_private_key_file(test_path('test_rsa.key'))
public_host_key = RSAKey(data=host_key.asbytes())
self.ts.add_server_key(host_key)
event = threading.Event()
server = NullServer()
self.assertTrue(not event.is_set())
self.assertEqual(None, self.tc.get_username())
self.assertEqual(None, self.ts.get_username())
self.assertEqual(False, self.tc.is_authenticated())
self.assertEqual(False, self.ts.is_authenticated())
self.ts.start_server(event, server)
self.tc.connect(hostkey=public_host_key,
username='******', password='******')
event.wait(1.0)
self.assertTrue(event.is_set())
self.assertTrue(self.ts.is_active())
self.assertEqual('slowdive', self.tc.get_username())
self.assertEqual('slowdive', self.ts.get_username())
self.assertEqual(True, self.tc.is_authenticated())
self.assertEqual(True, self.ts.is_authenticated())
def test_3a_long_banner(self):
"""
verify that a long banner doesn't mess up the handshake.
"""
host_key = RSAKey.from_private_key_file(test_path('test_rsa.key'))
public_host_key = RSAKey(data=host_key.asbytes())
self.ts.add_server_key(host_key)
event = threading.Event()
server = NullServer()
self.assertTrue(not event.is_set())
self.socks.send(LONG_BANNER)
self.ts.start_server(event, server)
self.tc.connect(hostkey=public_host_key,
username='******', password='******')
event.wait(1.0)
self.assertTrue(event.is_set())
self.assertTrue(self.ts.is_active())
def test_4_special(self):
"""
verify that the client can demand odd handshake settings, and can
renegotiate keys in mid-stream.
"""
def force_algorithms(options):
options.ciphers = ('aes256-cbc',)
options.digests = ('hmac-md5-96',)
self.setup_test_server(client_options=force_algorithms)
self.assertEqual('aes256-cbc', self.tc.local_cipher)
self.assertEqual('aes256-cbc', self.tc.remote_cipher)
self.assertEqual(12, self.tc.packetizer.get_mac_size_out())
self.assertEqual(12, self.tc.packetizer.get_mac_size_in())
self.tc.send_ignore(1024)
self.tc.renegotiate_keys()
self.ts.send_ignore(1024)
def test_5_keepalive(self):
"""
verify that the keepalive will be sent.
"""
self.setup_test_server()
self.assertEqual(None, getattr(self.server, '_global_request', None))
self.tc.set_keepalive(1)
time.sleep(2)
self.assertEqual('*****@*****.**', self.server._global_request)
def test_6_exec_command(self):
"""
verify that exec_command() does something reasonable.
"""
self.setup_test_server()
chan = self.tc.open_session()
schan = self.ts.accept(1.0)
try:
chan.exec_command('no')
self.assertTrue(False)
except SSHException:
pass
chan = self.tc.open_session()
chan.exec_command('yes')
schan = self.ts.accept(1.0)
schan.send('Hello there.\n')
schan.send_stderr('This is on stderr.\n')
schan.close()
f = chan.makefile()
self.assertEqual('Hello there.\n', f.readline())
self.assertEqual('', f.readline())
f = chan.makefile_stderr()
self.assertEqual('This is on stderr.\n', f.readline())
self.assertEqual('', f.readline())
# now try it with combined stdout/stderr
chan = self.tc.open_session()
chan.exec_command('yes')
schan = self.ts.accept(1.0)
schan.send('Hello there.\n')
schan.send_stderr('This is on stderr.\n')
schan.close()
chan.set_combine_stderr(True)
f = chan.makefile()
self.assertEqual('Hello there.\n', f.readline())
self.assertEqual('This is on stderr.\n', f.readline())
self.assertEqual('', f.readline())
def test_6a_channel_can_be_used_as_context_manager(self):
"""
verify that exec_command() does something reasonable.
"""
self.setup_test_server()
with self.tc.open_session() as chan:
with self.ts.accept(1.0) as schan:
chan.exec_command('yes')
schan.send('Hello there.\n')
schan.close()
f = chan.makefile()
self.assertEqual('Hello there.\n', f.readline())
self.assertEqual('', f.readline())
def test_7_invoke_shell(self):
"""
verify that invoke_shell() does something reasonable.
"""
self.setup_test_server()
chan = self.tc.open_session()
chan.invoke_shell()
schan = self.ts.accept(1.0)
chan.send('communist j. cat\n')
f = schan.makefile()
self.assertEqual('communist j. cat\n', f.readline())
chan.close()
self.assertEqual('', f.readline())
def test_8_channel_exception(self):
"""
verify that ChannelException is thrown for a bad open-channel request.
"""
self.setup_test_server()
try:
chan = self.tc.open_channel('bogus')
self.fail('expected exception')
except ChannelException as e:
self.assertTrue(e.code == OPEN_FAILED_ADMINISTRATIVELY_PROHIBITED)
def test_9_exit_status(self):
"""
verify that get_exit_status() works.
"""
self.setup_test_server()
chan = self.tc.open_session()
schan = self.ts.accept(1.0)
chan.exec_command('yes')
schan.send('Hello there.\n')
self.assertTrue(not chan.exit_status_ready())
# trigger an EOF
schan.shutdown_read()
schan.shutdown_write()
schan.send_exit_status(23)
schan.close()
f = chan.makefile()
self.assertEqual('Hello there.\n', f.readline())
self.assertEqual('', f.readline())
count = 0
while not chan.exit_status_ready():
time.sleep(0.1)
count += 1
if count > 50:
raise Exception("timeout")
self.assertEqual(23, chan.recv_exit_status())
chan.close()
def test_A_select(self):
"""
verify that select() on a channel works.
"""
self.setup_test_server()
chan = self.tc.open_session()
chan.invoke_shell()
schan = self.ts.accept(1.0)
# nothing should be ready
r, w, e = select.select([chan], [], [], 0.1)
self.assertEqual([], r)
self.assertEqual([], w)
self.assertEqual([], e)
schan.send('hello\n')
# something should be ready now (give it 1 second to appear)
for i in range(10):
r, w, e = select.select([chan], [], [], 0.1)
if chan in r:
break
time.sleep(0.1)
self.assertEqual([chan], r)
self.assertEqual([], w)
self.assertEqual([], e)
self.assertEqual(b'hello\n', chan.recv(6))
# and, should be dead again now
r, w, e = select.select([chan], [], [], 0.1)
self.assertEqual([], r)
self.assertEqual([], w)
self.assertEqual([], e)
schan.close()
# detect eof?
for i in range(10):
r, w, e = select.select([chan], [], [], 0.1)
if chan in r:
break
time.sleep(0.1)
self.assertEqual([chan], r)
self.assertEqual([], w)
self.assertEqual([], e)
self.assertEqual(bytes(), chan.recv(16))
# make sure the pipe is still open for now...
p = chan._pipe
self.assertEqual(False, p._closed)
chan.close()
# ...and now is closed.
self.assertEqual(True, p._closed)
def test_B_renegotiate(self):
"""
verify that a transport can correctly renegotiate mid-stream.
"""
self.setup_test_server()
self.tc.packetizer.REKEY_BYTES = 16384
chan = self.tc.open_session()
chan.exec_command('yes')
schan = self.ts.accept(1.0)
self.assertEqual(self.tc.H, self.tc.session_id)
for i in range(20):
chan.send('x' * 1024)
chan.close()
# allow a few seconds for the rekeying to complete
for i in range(50):
if self.tc.H != self.tc.session_id:
break
time.sleep(0.1)
self.assertNotEqual(self.tc.H, self.tc.session_id)
schan.close()
def test_C_compression(self):
"""
verify that zlib compression is basically working.
"""
def force_compression(o):
o.compression = ('zlib',)
self.setup_test_server(force_compression, force_compression)
chan = self.tc.open_session()
chan.exec_command('yes')
schan = self.ts.accept(1.0)
bytes = self.tc.packetizer._Packetizer__sent_bytes
chan.send('x' * 1024)
bytes2 = self.tc.packetizer._Packetizer__sent_bytes
# tests show this is actually compressed to *52 bytes*! including packet overhead! nice!! :)
self.assertTrue(bytes2 - bytes < 1024)
self.assertEqual(52, bytes2 - bytes)
chan.close()
schan.close()
def test_D_x11(self):
"""
verify that an x11 port can be requested and opened.
"""
self.setup_test_server()
chan = self.tc.open_session()
chan.exec_command('yes')
schan = self.ts.accept(1.0)
requested = []
def handler(c, addr_port):
addr, port = addr_port
requested.append((addr, port))
self.tc._queue_incoming_channel(c)
self.assertEqual(None, getattr(self.server, '_x11_screen_number', None))
cookie = chan.request_x11(0, single_connection=True, handler=handler)
self.assertEqual(0, self.server._x11_screen_number)
self.assertEqual('MIT-MAGIC-COOKIE-1', self.server._x11_auth_protocol)
self.assertEqual(cookie, self.server._x11_auth_cookie)
self.assertEqual(True, self.server._x11_single_connection)
x11_server = self.ts.open_x11_channel(('localhost', 6093))
x11_client = self.tc.accept()
self.assertEqual('localhost', requested[0][0])
self.assertEqual(6093, requested[0][1])
x11_server.send('hello')
self.assertEqual(b'hello', x11_client.recv(5))
x11_server.close()
x11_client.close()
chan.close()
schan.close()
def test_E_reverse_port_forwarding(self):
"""
verify that a client can ask the server to open a reverse port for
forwarding.
"""
self.setup_test_server()
chan = self.tc.open_session()
chan.exec_command('yes')
schan = self.ts.accept(1.0)
requested = []
def handler(c, origin_addr_port, server_addr_port):
requested.append(origin_addr_port)
requested.append(server_addr_port)
self.tc._queue_incoming_channel(c)
port = self.tc.request_port_forward('127.0.0.1', 0, handler)
self.assertEqual(port, self.server._listen.getsockname()[1])
cs = socket.socket()
cs.connect(('127.0.0.1', port))
ss, _ = self.server._listen.accept()
sch = self.ts.open_forwarded_tcpip_channel(ss.getsockname(), ss.getpeername())
cch = self.tc.accept()
sch.send('hello')
self.assertEqual(b'hello', cch.recv(5))
sch.close()
cch.close()
ss.close()
cs.close()
# now cancel it.
self.tc.cancel_port_forward('127.0.0.1', port)
self.assertTrue(self.server._listen is None)
def test_F_port_forwarding(self):
"""
verify that a client can forward new connections from a locally-
forwarded port.
"""
self.setup_test_server()
chan = self.tc.open_session()
chan.exec_command('yes')
schan = self.ts.accept(1.0)
# open a port on the "server" that the client will ask to forward to.
greeting_server = socket.socket()
greeting_server.bind(('127.0.0.1', 0))
greeting_server.listen(1)
greeting_port = greeting_server.getsockname()[1]
cs = self.tc.open_channel('direct-tcpip', ('127.0.0.1', greeting_port), ('', 9000))
sch = self.ts.accept(1.0)
cch = socket.socket()
cch.connect(self.server._tcpip_dest)
ss, _ = greeting_server.accept()
ss.send(b'Hello!\n')
ss.close()
sch.send(cch.recv(8192))
sch.close()
self.assertEqual(b'Hello!\n', cs.recv(7))
cs.close()
def test_G_stderr_select(self):
"""
verify that select() on a channel works even if only stderr is
receiving data.
"""
self.setup_test_server()
chan = self.tc.open_session()
chan.invoke_shell()
schan = self.ts.accept(1.0)
# nothing should be ready
r, w, e = select.select([chan], [], [], 0.1)
self.assertEqual([], r)
self.assertEqual([], w)
self.assertEqual([], e)
schan.send_stderr('hello\n')
# something should be ready now (give it 1 second to appear)
for i in range(10):
r, w, e = select.select([chan], [], [], 0.1)
if chan in r:
break
time.sleep(0.1)
self.assertEqual([chan], r)
self.assertEqual([], w)
self.assertEqual([], e)
self.assertEqual(b'hello\n', chan.recv_stderr(6))
# and, should be dead again now
r, w, e = select.select([chan], [], [], 0.1)
self.assertEqual([], r)
self.assertEqual([], w)
self.assertEqual([], e)
schan.close()
chan.close()
def test_H_send_ready(self):
"""
verify that send_ready() indicates when a send would not block.
"""
self.setup_test_server()
chan = self.tc.open_session()
chan.invoke_shell()
schan = self.ts.accept(1.0)
self.assertEqual(chan.send_ready(), True)
total = 0
K = '*' * 1024
limit = 1+(64 * 2 ** 15)
while total < limit:
chan.send(K)
total += len(K)
if not chan.send_ready():
break
self.assertTrue(total < limit)
schan.close()
chan.close()
self.assertEqual(chan.send_ready(), True)
def test_I_rekey_deadlock(self):
"""
Regression test for deadlock when in-transit messages are received after MSG_KEXINIT is sent
Note: When this test fails, it may leak threads.
"""
# Test for an obscure deadlocking bug that can occur if we receive
# certain messages while initiating a key exchange.
#
# The deadlock occurs as follows:
#
# In the main thread:
# 1. The user's program calls Channel.send(), which sends
# MSG_CHANNEL_DATA to the remote host.
# 2. Packetizer discovers that REKEY_BYTES has been exceeded, and
# sets the __need_rekey flag.
#
# In the Transport thread:
# 3. Packetizer notices that the __need_rekey flag is set, and raises
# NeedRekeyException.
# 4. In response to NeedRekeyException, the transport thread sends
# MSG_KEXINIT to the remote host.
#
# On the remote host (using any SSH implementation):
# 5. The MSG_CHANNEL_DATA is received, and MSG_CHANNEL_WINDOW_ADJUST is sent.
# 6. The MSG_KEXINIT is received, and a corresponding MSG_KEXINIT is sent.
#
# In the main thread:
# 7. The user's program calls Channel.send().
# 8. Channel.send acquires Channel.lock, then calls Transport._send_user_message().
# 9. Transport._send_user_message waits for Transport.clear_to_send
# to be set (i.e., it waits for re-keying to complete).
# Channel.lock is still held.
#
# In the Transport thread:
# 10. MSG_CHANNEL_WINDOW_ADJUST is received; Channel._window_adjust
# is called to handle it.
# 11. Channel._window_adjust tries to acquire Channel.lock, but it
# blocks because the lock is already held by the main thread.
#
# The result is that the Transport thread never processes the remote
# host's MSG_KEXINIT packet, because it becomes deadlocked while
# handling the preceding MSG_CHANNEL_WINDOW_ADJUST message.
# We set up two separate threads for sending and receiving packets,
# while the main thread acts as a watchdog timer. If the timer
# expires, a deadlock is assumed.
class SendThread(threading.Thread):
def __init__(self, chan, iterations, done_event):
threading.Thread.__init__(self, None, None, self.__class__.__name__)
self.setDaemon(True)
self.chan = chan
self.iterations = iterations
self.done_event = done_event
self.watchdog_event = threading.Event()
self.last = None
def run(self):
try:
for i in range(1, 1+self.iterations):
if self.done_event.is_set():
break
self.watchdog_event.set()
#print i, "SEND"
self.chan.send("x" * 2048)
finally:
self.done_event.set()
self.watchdog_event.set()
class ReceiveThread(threading.Thread):
def __init__(self, chan, done_event):
threading.Thread.__init__(self, None, None, self.__class__.__name__)
self.setDaemon(True)
self.chan = chan
self.done_event = done_event
self.watchdog_event = threading.Event()
def run(self):
try:
while not self.done_event.is_set():
if self.chan.recv_ready():
chan.recv(65536)
self.watchdog_event.set()
else:
if random.randint(0, 1):
time.sleep(random.randint(0, 500) / 1000.0)
finally:
self.done_event.set()
self.watchdog_event.set()
self.setup_test_server()
self.ts.packetizer.REKEY_BYTES = 2048
chan = self.tc.open_session()
chan.exec_command('yes')
schan = self.ts.accept(1.0)
# Monkey patch the client's Transport._handler_table so that the client
# sends MSG_CHANNEL_WINDOW_ADJUST whenever it receives an initial
# MSG_KEXINIT. This is used to simulate the effect of network latency
# on a real MSG_CHANNEL_WINDOW_ADJUST message.
self.tc._handler_table = self.tc._handler_table.copy() # copy per-class dictionary
_negotiate_keys = self.tc._handler_table[MSG_KEXINIT]
def _negotiate_keys_wrapper(self, m):
if self.local_kex_init is None: # Remote side sent KEXINIT
# Simulate in-transit MSG_CHANNEL_WINDOW_ADJUST by sending it
# before responding to the incoming MSG_KEXINIT.
m2 = Message()
m2.add_byte(cMSG_CHANNEL_WINDOW_ADJUST)
m2.add_int(chan.remote_chanid)
m2.add_int(1) # bytes to add
self._send_message(m2)
return _negotiate_keys(self, m)
self.tc._handler_table[MSG_KEXINIT] = _negotiate_keys_wrapper
# Parameters for the test
iterations = 500 # The deadlock does not happen every time, but it
# should after many iterations.
timeout = 5
# This event is set when the test is completed
done_event = threading.Event()
# Start the sending thread
st = SendThread(schan, iterations, done_event)
st.start()
# Start the receiving thread
rt = ReceiveThread(chan, done_event)
rt.start()
# Act as a watchdog timer, checking
deadlocked = False
while not deadlocked and not done_event.is_set():
for event in (st.watchdog_event, rt.watchdog_event):
event.wait(timeout)
if done_event.is_set():
break
if not event.is_set():
deadlocked = True
break
event.clear()
# Tell the threads to stop (if they haven't already stopped). Note
# that if one or more threads are deadlocked, they might hang around
# forever (until the process exits).
done_event.set()
# Assertion: We must not have detected a timeout.
self.assertFalse(deadlocked)
# Close the channels
schan.close()
chan.close()
def test_J_sanitze_packet_size(self):
"""
verify that we conform to the rfc of packet and window sizes.
"""
for val, correct in [(4095, MIN_PACKET_SIZE),
(None, DEFAULT_MAX_PACKET_SIZE),
(2**32, MAX_WINDOW_SIZE)]:
self.assertEqual(self.tc._sanitize_packet_size(val), correct)
def test_K_sanitze_window_size(self):
"""
verify that we conform to the rfc of packet and window sizes.
"""
for val, correct in [(32767, MIN_WINDOW_SIZE),
(None, DEFAULT_WINDOW_SIZE),
(2**32, MAX_WINDOW_SIZE)]:
self.assertEqual(self.tc._sanitize_window_size(val), correct)
class AuthTest(unittest.TestCase):
def setUp(self):
self.socks = LoopSocket()
self.sockc = LoopSocket()
self.sockc.link(self.socks)
self.tc = Transport(self.sockc)
self.ts = Transport(self.socks)
def tearDown(self):
self.tc.close()
self.ts.close()
self.socks.close()
self.sockc.close()
def start_server(self):
host_key = RSAKey.from_private_key_file(test_path('test_rsa.key'))
self.public_host_key = RSAKey(data=host_key.asbytes())
self.ts.add_server_key(host_key)
self.event = threading.Event()
self.server = NullServer()
self.assertTrue(not self.event.isSet())
self.ts.start_server(self.event, self.server)
def verify_finished(self):
self.event.wait(1.0)
self.assertTrue(self.event.isSet())
self.assertTrue(self.ts.is_active())
def test_1_bad_auth_type(self):
"""
verify that we get the right exception when an unsupported auth
type is requested.
"""
self.start_server()
try:
self.tc.connect(hostkey=self.public_host_key,
username='******',
password='******')
self.assertTrue(False)
except:
etype, evalue, etb = sys.exc_info()
self.assertEqual(BadAuthenticationType, etype)
self.assertEqual(['publickey'], evalue.allowed_types)
def test_2_bad_password(self):
"""
verify that a bad password gets the right exception, and that a retry
with the right password works.
"""
self.start_server()
self.tc.connect(hostkey=self.public_host_key)
try:
self.tc.auth_password(username='******', password='******')
self.assertTrue(False)
except:
etype, evalue, etb = sys.exc_info()
self.assertTrue(issubclass(etype, AuthenticationException))
self.tc.auth_password(username='******', password='******')
self.verify_finished()
def test_3_multipart_auth(self):
"""
verify that multipart auth works.
"""
self.start_server()
self.tc.connect(hostkey=self.public_host_key)
remain = self.tc.auth_password(username='******',
password='******')
self.assertEqual(['publickey'], remain)
key = DSSKey.from_private_key_file(test_path('test_dss.key'))
remain = self.tc.auth_publickey(username='******', key=key)
self.assertEqual([], remain)
self.verify_finished()
def test_4_interactive_auth(self):
"""
verify keyboard-interactive auth works.
"""
self.start_server()
self.tc.connect(hostkey=self.public_host_key)
def handler(title, instructions, prompts):
self.got_title = title
self.got_instructions = instructions
self.got_prompts = prompts
return ['cat']
remain = self.tc.auth_interactive('commie', handler)
self.assertEqual(self.got_title, 'password')
self.assertEqual(self.got_prompts, [('Password', False)])
self.assertEqual([], remain)
self.verify_finished()
def test_5_interactive_auth_fallback(self):
"""
verify that a password auth attempt will fallback to "interactive"
if password auth isn't supported but interactive is.
"""
self.start_server()
self.tc.connect(hostkey=self.public_host_key)
remain = self.tc.auth_password('commie', 'cat')
self.assertEqual([], remain)
self.verify_finished()
def test_6_auth_utf8(self):
"""
verify that utf-8 encoding happens in authentication.
"""
self.start_server()
self.tc.connect(hostkey=self.public_host_key)
remain = self.tc.auth_password('utf8', _pwd)
self.assertEqual([], remain)
self.verify_finished()
def test_7_auth_non_utf8(self):
"""
verify that non-utf-8 encoded passwords can be used for broken
servers.
"""
self.start_server()
self.tc.connect(hostkey=self.public_host_key)
remain = self.tc.auth_password('non-utf8', '\xff')
self.assertEqual([], remain)
self.verify_finished()
def test_8_auth_gets_disconnected(self):
"""
verify that we catch a server disconnecting during auth, and report
it as an auth failure.
"""
self.start_server()
self.tc.connect(hostkey=self.public_host_key)
try:
remain = self.tc.auth_password('bad-server', 'hello')
except:
etype, evalue, etb = sys.exc_info()
self.assertTrue(issubclass(etype, AuthenticationException))
class AuthTest (unittest.TestCase):
def setUp(self):
self.socks = LoopSocket()
self.sockc = LoopSocket()
self.sockc.link(self.socks)
self.tc = Transport(self.sockc)
self.ts = Transport(self.socks)
def tearDown(self):
self.tc.close()
self.ts.close()
self.socks.close()
self.sockc.close()
def start_server(self):
host_key = RSAKey.from_private_key_file(test_path('test_rsa.key'))
self.public_host_key = RSAKey(data=host_key.asbytes())
self.ts.add_server_key(host_key)
self.event = threading.Event()
self.server = NullServer()
self.assertTrue(not self.event.is_set())
self.ts.start_server(self.event, self.server)
def verify_finished(self):
self.event.wait(1.0)
self.assertTrue(self.event.is_set())
self.assertTrue(self.ts.is_active())
def test_1_bad_auth_type(self):
"""
verify that we get the right exception when an unsupported auth
type is requested.
"""
self.start_server()
try:
self.tc.connect(hostkey=self.public_host_key,
username='******', password='******')
self.assertTrue(False)
except:
etype, evalue, etb = sys.exc_info()
self.assertEqual(BadAuthenticationType, etype)
self.assertEqual(['publickey'], evalue.allowed_types)
def test_2_bad_password(self):
"""
verify that a bad password gets the right exception, and that a retry
with the right password works.
"""
self.start_server()
self.tc.connect(hostkey=self.public_host_key)
try:
self.tc.auth_password(username='******', password='******')
self.assertTrue(False)
except:
etype, evalue, etb = sys.exc_info()
self.assertTrue(issubclass(etype, AuthenticationException))
self.tc.auth_password(username='******', password='******')
self.verify_finished()
def test_3_multipart_auth(self):
"""
verify that multipart auth works.
"""
self.start_server()
self.tc.connect(hostkey=self.public_host_key)
remain = self.tc.auth_password(username='******', password='******')
self.assertEqual(['publickey'], remain)
key = DSSKey.from_private_key_file(test_path('test_dss.key'))
remain = self.tc.auth_publickey(username='******', key=key)
self.assertEqual([], remain)
self.verify_finished()
def test_4_interactive_auth(self):
"""
verify keyboard-interactive auth works.
"""
self.start_server()
self.tc.connect(hostkey=self.public_host_key)
def handler(title, instructions, prompts):
self.got_title = title
self.got_instructions = instructions
self.got_prompts = prompts
return ['cat']
remain = self.tc.auth_interactive('commie', handler)
self.assertEqual(self.got_title, 'password')
self.assertEqual(self.got_prompts, [('Password', False)])
self.assertEqual([], remain)
self.verify_finished()
def test_5_interactive_auth_fallback(self):
"""
verify that a password auth attempt will fallback to "interactive"
if password auth isn't supported but interactive is.
"""
self.start_server()
self.tc.connect(hostkey=self.public_host_key)
remain = self.tc.auth_password('commie', 'cat')
self.assertEqual([], remain)
self.verify_finished()
def test_6_auth_utf8(self):
"""
verify that utf-8 encoding happens in authentication.
"""
self.start_server()
self.tc.connect(hostkey=self.public_host_key)
remain = self.tc.auth_password('utf8', _pwd)
self.assertEqual([], remain)
self.verify_finished()
def test_7_auth_non_utf8(self):
"""
verify that non-utf-8 encoded passwords can be used for broken
servers.
"""
self.start_server()
self.tc.connect(hostkey=self.public_host_key)
remain = self.tc.auth_password('non-utf8', '\xff')
self.assertEqual([], remain)
self.verify_finished()
def test_8_auth_gets_disconnected(self):
"""
verify that we catch a server disconnecting during auth, and report
it as an auth failure.
"""
self.start_server()
self.tc.connect(hostkey=self.public_host_key)
try:
remain = self.tc.auth_password('bad-server', 'hello')
except:
etype, evalue, etb = sys.exc_info()
self.assertTrue(issubclass(etype, AuthenticationException))
def test_9_auth_non_responsive(self):
"""
verify that authentication times out if server takes to long to
respond (or never responds).
"""
self.tc.auth_timeout = 1 # 1 second, to speed up test
self.start_server()
self.tc.connect()
try:
remain = self.tc.auth_password('unresponsive-server', 'hello')
except:
etype, evalue, etb = sys.exc_info()
self.assertTrue(issubclass(etype, AuthenticationException))
self.assertTrue('Authentication timeout' in str(evalue))
def setUp(self):
self.socks = LoopSocket()
self.sockc = LoopSocket()
self.sockc.link(self.socks)
self.tc = Transport(self.sockc)
self.ts = Transport(self.socks)