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import struct
import pytest
from ssh_audit.auditconf import AuditConf
from ssh_audit.fingerprint import Fingerprint
from ssh_audit.outputbuffer import OutputBuffer
from ssh_audit.protocol import Protocol
from ssh_audit.readbuf import ReadBuf
from ssh_audit.ssh1 import SSH1
from ssh_audit.ssh1_publickeymessage import SSH1_PublicKeyMessage
from ssh_audit.ssh_audit import audit
from ssh_audit.writebuf import WriteBuf
# pylint: disable=line-too-long,attribute-defined-outside-init
class TestSSH1:
@pytest.fixture(autouse=True)
def init(self, ssh_audit):
self.OutputBuffer = OutputBuffer
self.protocol = Protocol
self.ssh1 = SSH1
self.PublicKeyMessage = SSH1_PublicKeyMessage
self.rbuf = ReadBuf
self.wbuf = WriteBuf
self.audit = audit
self.AuditConf = AuditConf
self.fingerprint = Fingerprint
def _conf(self):
conf = self.AuditConf('localhost', 22)
conf.colors = False
conf.batch = True
conf.verbose = True
conf.ssh1 = True
conf.ssh2 = False
return conf
def _create_ssh1_packet(self, payload, valid_crc=True):
padding = -(len(payload) + 4) % 8
plen = len(payload) + 4
pad_bytes = b'\x00' * padding
cksum = self.ssh1.crc32(pad_bytes + payload) if valid_crc else 0
data = struct.pack('>I', plen) + pad_bytes + payload + struct.pack('>I', cksum)
return data
@classmethod
def _server_key(cls):
return (1024, 0x10001, 0xee6552da432e0ac2c422df1a51287507748bfe3b5e3e4fa989a8f49fdc163a17754939ef18ef8a667ea3b71036a151fcd7f5e01ceef1e4439864baf3ac569047582c69d6c128212e0980dcb3168f00d371004039983f6033cd785b8b8f85096c7d9405cbfdc664e27c966356a6b4eb6ee20ad43414b50de18b22829c1880b551)
@classmethod
def _host_key(cls):
return (2048, 0x10001, 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)
def _pkm_payload(self):
w = self.wbuf()
w.write(b'\x88\x99\xaa\xbb\xcc\xdd\xee\xff')
b, e, m = self._server_key()
w.write_int(b).write_mpint1(e).write_mpint1(m)
b, e, m = self._host_key()
w.write_int(b).write_mpint1(e).write_mpint1(m)
w.write_int(2)
w.write_int(72)
w.write_int(36)
return w.write_flush()
def test_crc32(self):
assert self.ssh1.crc32(b'') == 0x00
assert self.ssh1.crc32(b'The quick brown fox jumps over the lazy dog') == 0xb9c60808
def test_fingerprint(self):
# pylint: disable=protected-access
b, e, m = self._host_key()
fpd = self.wbuf._create_mpint(m, False)
fpd += self.wbuf._create_mpint(e, False)
fp = self.fingerprint(fpd)
assert b == 2048
assert fp.md5 == 'MD5:9d:26:f8:39:fc:20:9d:9b:ca:cc:4a:0f:e1:93:f5:96'
assert fp.sha256 == 'SHA256:vZdx3mhzbvVJmn08t/ruv8WDhJ9jfKYsCTuSzot+QIs'
def _assert_pkm_keys(self, pkm, skey, hkey):
b, e, m = skey
assert pkm.server_key_bits == b
assert pkm.server_key_public_exponent == e
assert pkm.server_key_public_modulus == m
b, e, m = hkey
assert pkm.host_key_bits == b
assert pkm.host_key_public_exponent == e
assert pkm.host_key_public_modulus == m
def _assert_pkm_fields(self, pkm, skey, hkey):
assert pkm is not None
assert pkm.cookie == b'\x88\x99\xaa\xbb\xcc\xdd\xee\xff'
self._assert_pkm_keys(pkm, skey, hkey)
assert pkm.protocol_flags == 2
assert pkm.supported_ciphers_mask == 72
assert pkm.supported_ciphers == ['3des', 'blowfish']
assert pkm.supported_authentications_mask == 36
assert pkm.supported_authentications == ['rsa', 'tis']
fp = self.fingerprint(pkm.host_key_fingerprint_data)
assert fp.md5 == 'MD5:9d:26:f8:39:fc:20:9d:9b:ca:cc:4a:0f:e1:93:f5:96'
assert fp.sha256 == 'SHA256:vZdx3mhzbvVJmn08t/ruv8WDhJ9jfKYsCTuSzot+QIs'
def test_pkm_init(self):
cookie = b'\x88\x99\xaa\xbb\xcc\xdd\xee\xff'
pflags, cmask, amask = 2, 72, 36
skey, hkey = self._server_key(), self._host_key()
pkm = self.PublicKeyMessage(cookie, skey, hkey, pflags, cmask, amask)
self._assert_pkm_fields(pkm, skey, hkey)
for skey2 in ([], [0], [0, 1], [0, 1, 2, 3]):
with pytest.raises(ValueError):
pkm = self.PublicKeyMessage(cookie, skey2, hkey, pflags, cmask, amask)
for hkey2 in ([], [0], [0, 1], [0, 1, 2, 3]):
with pytest.raises(ValueError):
print(hkey2)
pkm = self.PublicKeyMessage(cookie, skey, hkey2, pflags, cmask, amask)
def test_pkm_read(self):
pkm = self.PublicKeyMessage.parse(self._pkm_payload())
self._assert_pkm_fields(pkm, self._server_key(), self._host_key())
def test_pkm_payload(self):
cookie = b'\x88\x99\xaa\xbb\xcc\xdd\xee\xff'
skey, hkey = self._server_key(), self._host_key()
pflags, cmask, amask = 2, 72, 36
pkm1 = self.PublicKeyMessage(cookie, skey, hkey, pflags, cmask, amask)
pkm2 = self.PublicKeyMessage.parse(self._pkm_payload())
assert pkm1.payload == pkm2.payload
def test_ssh1_server_simple(self, output_spy, virtual_socket):
vsocket = virtual_socket
w = self.wbuf()
w.write_byte(self.protocol.SMSG_PUBLIC_KEY)
w.write(self._pkm_payload())
vsocket.rdata.append(b'SSH-1.5-OpenSSH_7.2 ssh-audit-test\r\n')
vsocket.rdata.append(self._create_ssh1_packet(w.write_flush()))
output_spy.begin()
out = self.OutputBuffer()
self.audit(out, self._conf())
out.write()
lines = output_spy.flush()
assert len(lines) == 21
def test_ssh1_server_invalid_first_packet(self, output_spy, virtual_socket):
vsocket = virtual_socket
w = self.wbuf()
w.write_byte(self.protocol.SMSG_PUBLIC_KEY + 1)
w.write(self._pkm_payload())
vsocket.rdata.append(b'SSH-1.5-OpenSSH_7.2 ssh-audit-test\r\n')
vsocket.rdata.append(self._create_ssh1_packet(w.write_flush()))
output_spy.begin()
out = self.OutputBuffer()
ret = self.audit(out, self._conf())
out.write()
assert ret != 0
lines = output_spy.flush()
assert len(lines) == 14
assert 'unknown message' in lines[-1]
def test_ssh1_server_invalid_checksum(self, output_spy, virtual_socket):
vsocket = virtual_socket
w = self.wbuf()
w.write_byte(self.protocol.SMSG_PUBLIC_KEY + 1)
w.write(self._pkm_payload())
vsocket.rdata.append(b'SSH-1.5-OpenSSH_7.2 ssh-audit-test\r\n')
vsocket.rdata.append(self._create_ssh1_packet(w.write_flush(), False))
output_spy.begin()
out = self.OutputBuffer()
with pytest.raises(SystemExit):
self.audit(out, self._conf())
out.write()
lines = output_spy.flush()
assert len(lines) == 3
assert ('checksum' in lines[0]) or ('checksum' in lines[1]) or ('checksum' in lines[2])
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