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# Copyright (C) 2003-2009 Robey Pointer <robeypointer@gmail.com>
#
# This file is part of paramiko.
#
# Paramiko is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""
Some unit tests for the ssh2 protocol in Transport.
"""
import sys
import unittest
from hashlib import sha1
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.ciphers import algorithms, Cipher, modes
from paramiko import Message, Packetizer, util
from paramiko.common import byte_chr, zero_byte
from .loop import LoopSocket
x55 = byte_chr(0x55)
x1f = byte_chr(0x1F)
class PacketizerTest(unittest.TestCase):
def test_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", # noqa
data[:16],
)
def test_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" # noqa
)
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_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)
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