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test_kex.py
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# Copyright (C) 2003-2009 Robey Pointer <[email protected]>
#
# 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.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
"""
Some unit tests for the key exchange protocols.
"""
from binascii import hexlify
import os
import unittest
import paramiko.util
from paramiko.kex_group1 import KexGroup1
from paramiko.kex_gex import KexGex, KexGexSHA256
from paramiko import Message
from paramiko.common import byte_chr
def dummy_urandom(n):
return byte_chr(0xcc) * n
class FakeKey (object):
def __str__(self):
return 'fake-key'
def asbytes(self):
return b'fake-key'
def sign_ssh_data(self, H):
return b'fake-sig'
class FakeModulusPack (object):
P = 0xFFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF
G = 2
def get_modulus(self, min, ask, max):
return self.G, self.P
class FakeTransport(object):
local_version = 'SSH-2.0-paramiko_1.0'
remote_version = 'SSH-2.0-lame'
local_kex_init = 'local-kex-init'
remote_kex_init = 'remote-kex-init'
def _send_message(self, m):
self._message = m
def _expect_packet(self, *t):
self._expect = t
def _set_K_H(self, K, H):
self._K = K
self._H = H
def _verify_key(self, host_key, sig):
self._verify = (host_key, sig)
def _activate_outbound(self):
self._activated = True
def _log(self, level, s):
pass
def get_server_key(self):
return FakeKey()
def _get_modulus_pack(self):
return FakeModulusPack()
class KexTest (unittest.TestCase):
K = 14730343317708716439807310032871972459448364195094179797249681733965528989482751523943515690110179031004049109375612685505881911274101441415545039654102474376472240501616988799699744135291070488314748284283496055223852115360852283821334858541043710301057312858051901453919067023103730011648890038847384890504
def setUp(self):
self._original_urandom = os.urandom
os.urandom = dummy_urandom
def tearDown(self):
os.urandom = self._original_urandom
def test_1_group1_client(self):
transport = FakeTransport()
transport.server_mode = False
kex = KexGroup1(transport)
kex.start_kex()
x = b'1E000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D4'
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertEqual((paramiko.kex_group1._MSG_KEXDH_REPLY,), transport._expect)
# fake "reply"
msg = Message()
msg.add_string('fake-host-key')
msg.add_mpint(69)
msg.add_string('fake-sig')
msg.rewind()
kex.parse_next(paramiko.kex_group1._MSG_KEXDH_REPLY, msg)
H = b'03079780F3D3AD0B3C6DB30C8D21685F367A86D2'
self.assertEqual(self.K, transport._K)
self.assertEqual(H, hexlify(transport._H).upper())
self.assertEqual((b'fake-host-key', b'fake-sig'), transport._verify)
self.assertTrue(transport._activated)
def test_2_group1_server(self):
transport = FakeTransport()
transport.server_mode = True
kex = KexGroup1(transport)
kex.start_kex()
self.assertEqual((paramiko.kex_group1._MSG_KEXDH_INIT,), transport._expect)
msg = Message()
msg.add_mpint(69)
msg.rewind()
kex.parse_next(paramiko.kex_group1._MSG_KEXDH_INIT, msg)
H = b'B16BF34DD10945EDE84E9C1EF24A14BFDC843389'
x = b'1F0000000866616B652D6B6579000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D40000000866616B652D736967'
self.assertEqual(self.K, transport._K)
self.assertEqual(H, hexlify(transport._H).upper())
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertTrue(transport._activated)
def test_3_gex_client(self):
transport = FakeTransport()
transport.server_mode = False
kex = KexGex(transport)
kex.start_kex()
x = b'22000004000000080000002000'
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertEqual((paramiko.kex_gex._MSG_KEXDH_GEX_GROUP,), transport._expect)
msg = Message()
msg.add_mpint(FakeModulusPack.P)
msg.add_mpint(FakeModulusPack.G)
msg.rewind()
kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_GROUP, msg)
x = b'20000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D4'
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertEqual((paramiko.kex_gex._MSG_KEXDH_GEX_REPLY,), transport._expect)
msg = Message()
msg.add_string('fake-host-key')
msg.add_mpint(69)
msg.add_string('fake-sig')
msg.rewind()
kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_REPLY, msg)
H = b'A265563F2FA87F1A89BF007EE90D58BE2E4A4BD0'
self.assertEqual(self.K, transport._K)
self.assertEqual(H, hexlify(transport._H).upper())
self.assertEqual((b'fake-host-key', b'fake-sig'), transport._verify)
self.assertTrue(transport._activated)
def test_4_gex_old_client(self):
transport = FakeTransport()
transport.server_mode = False
kex = KexGex(transport)
kex.start_kex(_test_old_style=True)
x = b'1E00000800'
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertEqual((paramiko.kex_gex._MSG_KEXDH_GEX_GROUP,), transport._expect)
msg = Message()
msg.add_mpint(FakeModulusPack.P)
msg.add_mpint(FakeModulusPack.G)
msg.rewind()
kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_GROUP, msg)
x = b'20000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D4'
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertEqual((paramiko.kex_gex._MSG_KEXDH_GEX_REPLY,), transport._expect)
msg = Message()
msg.add_string('fake-host-key')
msg.add_mpint(69)
msg.add_string('fake-sig')
msg.rewind()
kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_REPLY, msg)
H = b'807F87B269EF7AC5EC7E75676808776A27D5864C'
self.assertEqual(self.K, transport._K)
self.assertEqual(H, hexlify(transport._H).upper())
self.assertEqual((b'fake-host-key', b'fake-sig'), transport._verify)
self.assertTrue(transport._activated)
def test_5_gex_server(self):
transport = FakeTransport()
transport.server_mode = True
kex = KexGex(transport)
kex.start_kex()
self.assertEqual((paramiko.kex_gex._MSG_KEXDH_GEX_REQUEST, paramiko.kex_gex._MSG_KEXDH_GEX_REQUEST_OLD), transport._expect)
msg = Message()
msg.add_int(1024)
msg.add_int(2048)
msg.add_int(4096)
msg.rewind()
kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_REQUEST, msg)
x = b'1F0000008100FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF0000000102'
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertEqual((paramiko.kex_gex._MSG_KEXDH_GEX_INIT,), transport._expect)
msg = Message()
msg.add_mpint(12345)
msg.rewind()
kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_INIT, msg)
K = 67592995013596137876033460028393339951879041140378510871612128162185209509220726296697886624612526735888348020498716482757677848959420073720160491114319163078862905400020959196386947926388406687288901564192071077389283980347784184487280885335302632305026248574716290537036069329724382811853044654824945750581
H = b'CE754197C21BF3452863B4F44D0B3951F12516EF'
x = b'210000000866616B652D6B6579000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D40000000866616B652D736967'
self.assertEqual(K, transport._K)
self.assertEqual(H, hexlify(transport._H).upper())
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertTrue(transport._activated)
def test_6_gex_server_with_old_client(self):
transport = FakeTransport()
transport.server_mode = True
kex = KexGex(transport)
kex.start_kex()
self.assertEqual((paramiko.kex_gex._MSG_KEXDH_GEX_REQUEST, paramiko.kex_gex._MSG_KEXDH_GEX_REQUEST_OLD), transport._expect)
msg = Message()
msg.add_int(2048)
msg.rewind()
kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_REQUEST_OLD, msg)
x = b'1F0000008100FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF0000000102'
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertEqual((paramiko.kex_gex._MSG_KEXDH_GEX_INIT,), transport._expect)
msg = Message()
msg.add_mpint(12345)
msg.rewind()
kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_INIT, msg)
K = 67592995013596137876033460028393339951879041140378510871612128162185209509220726296697886624612526735888348020498716482757677848959420073720160491114319163078862905400020959196386947926388406687288901564192071077389283980347784184487280885335302632305026248574716290537036069329724382811853044654824945750581
H = b'B41A06B2E59043CEFC1AE16EC31F1E2D12EC455B'
x = b'210000000866616B652D6B6579000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D40000000866616B652D736967'
self.assertEqual(K, transport._K)
self.assertEqual(H, hexlify(transport._H).upper())
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertTrue(transport._activated)
def test_7_gex_sha256_client(self):
transport = FakeTransport()
transport.server_mode = False
kex = KexGexSHA256(transport)
kex.start_kex()
x = b'22000004000000080000002000'
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertEqual((paramiko.kex_gex._MSG_KEXDH_GEX_GROUP,), transport._expect)
msg = Message()
msg.add_mpint(FakeModulusPack.P)
msg.add_mpint(FakeModulusPack.G)
msg.rewind()
kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_GROUP, msg)
x = b'20000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D4'
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertEqual((paramiko.kex_gex._MSG_KEXDH_GEX_REPLY,), transport._expect)
msg = Message()
msg.add_string('fake-host-key')
msg.add_mpint(69)
msg.add_string('fake-sig')
msg.rewind()
kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_REPLY, msg)
H = b'AD1A9365A67B4496F05594AD1BF656E3CDA0851289A4C1AFF549FEAE50896DF4'
self.assertEqual(self.K, transport._K)
self.assertEqual(H, hexlify(transport._H).upper())
self.assertEqual((b'fake-host-key', b'fake-sig'), transport._verify)
self.assertTrue(transport._activated)
def test_8_gex_sha256_old_client(self):
transport = FakeTransport()
transport.server_mode = False
kex = KexGexSHA256(transport)
kex.start_kex(_test_old_style=True)
x = b'1E00000800'
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertEqual((paramiko.kex_gex._MSG_KEXDH_GEX_GROUP,), transport._expect)
msg = Message()
msg.add_mpint(FakeModulusPack.P)
msg.add_mpint(FakeModulusPack.G)
msg.rewind()
kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_GROUP, msg)
x = b'20000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D4'
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertEqual((paramiko.kex_gex._MSG_KEXDH_GEX_REPLY,), transport._expect)
msg = Message()
msg.add_string('fake-host-key')
msg.add_mpint(69)
msg.add_string('fake-sig')
msg.rewind()
kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_REPLY, msg)
H = b'518386608B15891AE5237DEE08DCADDE76A0BCEFCE7F6DB3AD66BC41D256DFE5'
self.assertEqual(self.K, transport._K)
self.assertEqual(H, hexlify(transport._H).upper())
self.assertEqual((b'fake-host-key', b'fake-sig'), transport._verify)
self.assertTrue(transport._activated)
def test_9_gex_sha256_server(self):
transport = FakeTransport()
transport.server_mode = True
kex = KexGexSHA256(transport)
kex.start_kex()
self.assertEqual((paramiko.kex_gex._MSG_KEXDH_GEX_REQUEST, paramiko.kex_gex._MSG_KEXDH_GEX_REQUEST_OLD), transport._expect)
msg = Message()
msg.add_int(1024)
msg.add_int(2048)
msg.add_int(4096)
msg.rewind()
kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_REQUEST, msg)
x = b'1F0000008100FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF0000000102'
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertEqual((paramiko.kex_gex._MSG_KEXDH_GEX_INIT,), transport._expect)
msg = Message()
msg.add_mpint(12345)
msg.rewind()
kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_INIT, msg)
K = 67592995013596137876033460028393339951879041140378510871612128162185209509220726296697886624612526735888348020498716482757677848959420073720160491114319163078862905400020959196386947926388406687288901564192071077389283980347784184487280885335302632305026248574716290537036069329724382811853044654824945750581
H = b'CCAC0497CF0ABA1DBF55E1A3995D17F4CC31824B0E8D95CDF8A06F169D050D80'
x = b'210000000866616B652D6B6579000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D40000000866616B652D736967'
self.assertEqual(K, transport._K)
self.assertEqual(H, hexlify(transport._H).upper())
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertTrue(transport._activated)
def test_10_gex_sha256_server_with_old_client(self):
transport = FakeTransport()
transport.server_mode = True
kex = KexGexSHA256(transport)
kex.start_kex()
self.assertEqual((paramiko.kex_gex._MSG_KEXDH_GEX_REQUEST, paramiko.kex_gex._MSG_KEXDH_GEX_REQUEST_OLD), transport._expect)
msg = Message()
msg.add_int(2048)
msg.rewind()
kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_REQUEST_OLD, msg)
x = b'1F0000008100FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF0000000102'
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertEqual((paramiko.kex_gex._MSG_KEXDH_GEX_INIT,), transport._expect)
msg = Message()
msg.add_mpint(12345)
msg.rewind()
kex.parse_next(paramiko.kex_gex._MSG_KEXDH_GEX_INIT, msg)
K = 67592995013596137876033460028393339951879041140378510871612128162185209509220726296697886624612526735888348020498716482757677848959420073720160491114319163078862905400020959196386947926388406687288901564192071077389283980347784184487280885335302632305026248574716290537036069329724382811853044654824945750581
H = b'3DDD2AD840AD095E397BA4D0573972DC60F6461FD38A187CACA6615A5BC8ADBB'
x = b'210000000866616B652D6B6579000000807E2DDB1743F3487D6545F04F1C8476092FB912B013626AB5BCEB764257D88BBA64243B9F348DF7B41B8C814A995E00299913503456983FFB9178D3CD79EB6D55522418A8ABF65375872E55938AB99A84A0B5FC8A1ECC66A7C3766E7E0F80B7CE2C9225FC2DD683F4764244B72963BBB383F529DCF0C5D17740B8A2ADBE9208D40000000866616B652D736967'
self.assertEqual(K, transport._K)
self.assertEqual(H, hexlify(transport._H).upper())
self.assertEqual(x, hexlify(transport._message.asbytes()).upper())
self.assertTrue(transport._activated)