def test_parse_message(self):
actual = SMB2HeaderResponse()
data = b"\xfe\x53\x4d\x42" \
b"\x40\x00" \
b"\x00\x00" \
b"\x00\x00\x00\x00" \
b"\x01\x00" \
b"\x00\x00" \
b"\x00\x00\x00\x00" \
b"\x00\x00\x00\x00" \
b"\x01\x00\x00\x00\x00\x00\x00\x00" \
b"\x00\x00\x00\x00" \
b"\x00\x00\x00\x00" \
b"\x0a\x00\x00\x00\x00\x00\x00\x00" \
b"\x00\x00\x00\x00\x00\x00\x00\x00" \
b"\x00\x00\x00\x00\x00\x00\x00\x00" \
b"\x01\x02\x03\x04"
actual.unpack(data)
assert len(actual) == 68
assert actual['protocol_id'].get_value() == b"\xfeSMB"
assert actual['structure_size'].get_value() == 64
assert actual['credit_charge'].get_value() == 0
assert actual['status'].get_value() == 0
assert actual['command'].get_value() == Commands.SMB2_SESSION_SETUP
assert actual['credit_response'].get_value() == 0
assert actual['flags'].get_value() == 0
assert actual['next_command'].get_value() == 0
assert actual['message_id'].get_value() == 1
assert actual['reserved'].get_value() == 0
assert actual['tree_id'].get_value() == 0
assert actual['session_id'].get_value() == 10
assert actual['signature'].get_value() == b"\x00" * 16
assert actual['data'].get_value() == b"\x01\x02\x03\x04"
def test_verify_message_skip(self, smb_real):
connection = Connection(uuid.uuid4(), smb_real[2], smb_real[3], True)
connection.connect()
try:
header = SMB2HeaderResponse()
header['message_id'] = 0xFFFFFFFFFFFFFFFF
connection.verify_signature(header, 0)
finally:
connection.disconnect()
def __call__(cls, header=None):
if header:
new_cls = cls.__registry.get(header['status'].get_value(), cls)
else:
header = SMB2HeaderResponse()
header['status'] = cls._STATUS_CODE
header['data'] = SMB2ErrorResponse()
new_cls = cls
return super(_SMBErrorRegistry, new_cls).__call__(header)
def test_verify_fail_no_session(self, smb_real):
connection = Connection(uuid.uuid4(), smb_real[2], smb_real[3], True)
connection.connect()
try:
header = SMB2HeaderResponse()
header['message_id'] = 1
header['flags'].set_flag(Smb2Flags.SMB2_FLAGS_SIGNED)
with pytest.raises(SMBException) as exc:
connection.verify_signature(header, 100)
assert str(exc.value) == "Failed to find session 100 for " \
"message verification"
finally:
connection.disconnect()
def test_decrypt_invalid_session_id(self, smb_real):
connection = Connection(uuid.uuid4(), smb_real[2], smb_real[3], True)
session = Session(connection, smb_real[0], smb_real[1])
connection.connect()
try:
session.connect()
# just get some random message
b_header = connection.preauth_integrity_hash_value[-1]
header = SMB2HeaderResponse()
header.unpack(b_header)
enc_header = connection._encrypt(header.pack(), session)
assert isinstance(enc_header, SMB2TransformHeader)
enc_header['session_id'] = 100
with pytest.raises(SMBException) as exc:
connection._decrypt(enc_header)
assert str(exc.value) == "Failed to find valid session 100 for " \
"message decryption"
finally:
connection.disconnect(True)
def test_decrypt_invalid_flag(self, smb_real):
connection = Connection(uuid.uuid4(), smb_real[2], smb_real[3], True)
session = Session(connection, smb_real[0], smb_real[1])
connection.connect()
try:
session.connect()
# just get some random message
b_header = connection.preauth_integrity_hash_value[-1]
header = SMB2HeaderResponse()
header.unpack(b_header)
enc_header = connection._encrypt(header.pack(), session)
assert isinstance(enc_header, SMB2TransformHeader)
enc_header['flags'] = 5
with pytest.raises(SMBException) as exc:
connection._decrypt(enc_header)
assert str(exc.value) == "Expecting flag of 0x0001 but got 5 in " \
"the SMB Transform Header Response"
finally:
connection.disconnect(True)
def test_verify_mistmatch(self, smb_real):
connection = Connection(uuid.uuid4(), smb_real[2], smb_real[3], True)
session = Session(connection, smb_real[0], smb_real[1])
connection.connect()
try:
session.connect()
b_header = connection.preauth_integrity_hash_value[-2]
header = SMB2HeaderResponse()
header.unpack(b_header)
# just set some random values for verification failure
header['flags'].set_flag(Smb2Flags.SMB2_FLAGS_SIGNED)
header['signature'] = b"\xff" * 16
with pytest.raises(SMBException) as exc:
connection.verify_signature(
header,
list(connection.session_table.keys())[0],
force=True)
assert "Server message signature could not be verified:" in str(
exc.value)
finally:
connection.disconnect(True)
def test_create_message(self):
header = SMB2HeaderResponse()
header['command'] = Commands.SMB2_SESSION_SETUP
header['message_id'] = 1
header['session_id'] = 10
expected = b"\xfe\x53\x4d\x42" \
b"\x40\x00" \
b"\x00\x00" \
b"\x00\x00\x00\x00" \
b"\x01\x00" \
b"\x00\x00" \
b"\x00\x00\x00\x00" \
b"\x00\x00\x00\x00" \
b"\x01\x00\x00\x00\x00\x00\x00\x00" \
b"\x00\x00\x00\x00" \
b"\x00\x00\x00\x00" \
b"\x0a\x00\x00\x00\x00\x00\x00\x00" \
b"\x00\x00\x00\x00\x00\x00\x00\x00" \
b"\x00\x00\x00\x00\x00\x00\x00\x00"
actual = header.pack()
assert len(header) == 64
assert actual == expected
