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#!/usr/bin/env python
import unittest
from ct.proto import client_pb2
from ct.proto import test_message_pb2
from ct.serialization import tls_message
valid_test_message = test_message_pb2.TestMessage()
valid_test_message.uint_8 = 0
valid_test_message.uint_16 = 258
valid_test_message.uint_24 = 197637
valid_test_message.uint_32 = 101124105
valid_test_message.uint_48 = 11042563100175
valid_test_message.uint_64 = 255
valid_test_message.fixed_bytes = "\xff\x00"
valid_test_message.var_bytes = "hello"
valid_test_message.var_bytes2 = "world"
valid_test_message.vector_bytes.append("hello")
valid_test_message.vector_bytes.append("world")
valid_test_message.vector_uint32.append(1)
valid_test_message.vector_uint32.append(255)
valid_test_message.test_enum = test_message_pb2.TestMessage.ENUM_1
valid_test_message.select_uint32 = 2
valid_test_message.embedded_message.uint_32 = 3
valid_test_message.repeated_message.add().uint_32 = 4
valid_test_message.repeated_message.add().uint_32 = 256
# Test vectors are given as a list of serialized, hex-encoded components.
serialized_valid_test_message = [
"00", # 0: uint_8
"0102", # 1: uint_16
"030405", # 2: uint_24
"06070809", # 3: uint_32
"0a0b0c0d0e0f", # 4: uint_48
"00000000000000ff", # 5: uint_64
"ff00", # 6: fixed_bytes
"05" + "hello".encode("hex"), # 7: var_bytes
"0005" + "world".encode("hex"), # 8: var_bytes2
"0c" + "05" + "hello".encode("hex") + "05" +
"world".encode("hex"), # 9: vector_bytes
"0800000001000000ff", # 10: vector_uint32
"0001", # 11: test_enum
"00000002", # 12: select_uint32
"0003", # 13: embedded_message.uint_32
"0400040100", # 14: repeated_message
]
class TLSReaderTest(unittest.TestCase):
def verify_decode(self, test_vector, test_message):
serialized = "".join(test_vector).decode("hex")
message = test_message_pb2.TestMessage()
tls_message.decode(serialized, message)
self.assertEqual(test_message, message,
msg = "%s vs %s" % (test_message, message))
def verify_decode_fail(self, test_vector):
serialized = "".join(test_vector).decode("hex")
message = test_message_pb2.TestMessage()
self.assertRaises(tls_message.TLSDecodingError,
tls_message.decode, serialized, message)
def test_decode_valid(self):
self.verify_decode(serialized_valid_test_message, valid_test_message)
pass
def test_decode_valid_select(self):
test_vector = serialized_valid_test_message[:]
test_vector[11] = "0000"
test_vector[12] = ""
test_message = test_message_pb2.TestMessage()
test_message.CopyFrom(valid_test_message)
test_message.test_enum = test_message_pb2.TestMessage.ENUM_0
test_message.ClearField("select_uint32")
self.verify_decode(test_vector, test_message)
def test_decode_invalid_select_fails(self):
test_vector = serialized_valid_test_message[:]
test_vector[11] = "0000"
self.verify_decode_fail(test_vector)
def test_decode_too_short_fails(self):
test_vector = serialized_valid_test_message[:]
# var_bytes2 has a min length of 4
test_vector[8] = "bit".encode("hex")
self.verify_decode_fail(test_vector)
def test_decode_empty(self):
test_vector = serialized_valid_test_message[:]
# var_bytes has no min length
test_vector[7] = "00"
test_message = test_message_pb2.TestMessage()
test_message.CopyFrom(valid_test_message)
test_message.var_bytes = ""
self.verify_decode(test_vector, test_message)
def test_decode_too_long_fails(self):
test_vector = serialized_valid_test_message[:]
# var_bytes has a max length of 16
test_vector[7] = "16" + "Iamtoolongformyowngood".encode("hex")
self.verify_decode_fail(test_vector)
def test_decode_repeated_too_short_fails(self):
test_vector = serialized_valid_test_message[:]
# repeated_uint32 has a min total length of 4
test_vector[10] = "00"
self.verify_decode_fail(test_vector)
def test_decode_repeated_too_long_fails(self):
test_vector = serialized_valid_test_message[:]
# repeated_uint32 has a max total length of 8
test_vector[10] = "0c" + "00"*12
self.verify_decode_fail(test_vector)
def test_decode_repeated_invalid_contents_fails(self):
test_vector = serialized_valid_test_message[:]
# repeated_uint32 must be a multiple of 4
test_vector[10] = "02" + "0000"
self.verify_decode_fail(test_vector)
def test_read_longer_buffer(self):
test_vector = serialized_valid_test_message[:]
test_vector.append("somegarbageintheend".encode("hex"))
serialized = "".join(test_vector).decode("hex")
message = test_message_pb2.TestMessage()
reader = tls_message.TLSReader(serialized)
reader.read(message)
self.assertEqual(valid_test_message, message,
msg = "%s vs %s" % (valid_test_message, message))
self.assertFalse(reader.finished())
class TLSWriterTest(unittest.TestCase):
def verify_encode(self, test_message, test_vector):
serialized = tls_message.encode(test_message)
self.assertEqual("".join(test_vector), serialized.encode("hex"))
def verify_encode_fails(self, test_message):
self.assertRaises(tls_message.TLSEncodingError,
tls_message.encode, test_message)
def test_encode(self):
self.verify_encode(valid_test_message, serialized_valid_test_message)
def test_encode_ignores_skipped_fields(self):
test_message = test_message_pb2.TestMessage()
test_message.CopyFrom(valid_test_message)
test_message.skip_uint32 = 42
self.verify_encode(test_message, serialized_valid_test_message)
def test_encode_ignores_bad_select(self):
test_vector = serialized_valid_test_message[:]
test_vector[11] = "0000"
test_vector[12] = ""
test_message = test_message_pb2.TestMessage()
test_message.CopyFrom(valid_test_message)
test_message.test_enum = test_message_pb2.TestMessage.ENUM_0
self.verify_encode(test_message, test_vector)
def test_encode_too_large_value_fails(self):
test_message = test_message_pb2.TestMessage()
test_message.CopyFrom(valid_test_message)
test_message.uint_8 = 65000
self.verify_encode_fails(test_message)
def test_encode_bad_length_fails(self):
test_message = test_message_pb2.TestMessage()
test_message.CopyFrom(valid_test_message)
test_message.fixed_bytes = "hello"
self.verify_encode_fails(test_message)
def test_encode_too_short_fails(self):
test_message = test_message_pb2.TestMessage()
test_message.CopyFrom(valid_test_message)
test_message.var_bytes2 = "sho"
self.verify_encode_fails(test_message)
def test_encode_too_long_fails(self):
test_message = test_message_pb2.TestMessage()
test_message.CopyFrom(valid_test_message)
test_message.var_bytes = "Iamtoolongformyowngood"
self.verify_encode_fails(test_message)
def test_encode_repeated_too_long_fails(self):
test_message = test_message_pb2.TestMessage()
test_message.CopyFrom(valid_test_message)
test_message.vector_uint32.extend([1, 2, 3, 4])
self.verify_encode_fails(test_message)
def test_encode_repeated_too_short_fails(self):
test_message = test_message_pb2.TestMessage()
test_message.CopyFrom(valid_test_message)
test_message.ClearField("vector_uint32")
self.verify_encode_fails(test_message)
class SCTEncodingTest(unittest.TestCase):
def setUp(self):
sct_proto = client_pb2.SignedCertificateTimestamp()
sct_proto.version = client_pb2.V1
sct_proto.id.key_id = (
"a4b90990b418581487bb13a2cc67700a3c359804f91bdfb8e377cd0ec80ddc10"
).decode('hex')
sct_proto.timestamp = 1365427532443
sct_proto.signature.hash_algorithm = client_pb2.DigitallySigned.SHA256
sct_proto.signature.sig_algorithm = client_pb2.DigitallySigned.ECDSA
sct_proto.signature.signature = (
"304502210089de897f603e590b1aa0d7c4236c2f697e90602795f7a469215fda5e"
"460123fc022065ab501ce3dbaf49bd563d1c9ff0ac76120bc11f65a44122b3cd8b"
"89fc77a48c").decode("hex")
self._sct_proto = sct_proto
def test_correctly_encodes_sct(self):
sct = tls_message.encode(self._sct_proto)
expected_sct = ("00a4b90990b418581487bb13a2cc67700a3c359804f91bdfb8e377"
"cd0ec80ddc100000013de9d2b29b000004030047304502210089de"
"897f603e590b1aa0d7c4236c2f697e90602795f7a469215fda5e46"
"0123fc022065ab501ce3dbaf49bd563d1c9ff0ac76120bc11f65a4"
"4122b3cd8b89fc77a48c").decode("hex")
self.assertEqual(sct, expected_sct)
def test_correctly_encodes_sct_list_one_sct(self):
# Taken from the C++ serializer test, to ensure this encoder
# produces results compatible with the C++ one.
single_sct = ("0069616d617075626c69636b657973686174776f6669766573697864"
"696765737400000000000004d20000040300097369676e6174757265"
).decode("hex")
sct_list = client_pb2.SignedCertificateTimestampList()
sct_list.sct_list.append(single_sct)
encoded_sct_list = tls_message.encode(sct_list)
self.assertEqual(encoded_sct_list[:4],
"003a0038".decode("hex"))
self.assertEqual(encoded_sct_list[4:], single_sct)
def test_correctly_encodes_sct_list_multiple_scts(self):
first_sct = tls_message.encode(self._sct_proto)
sct_proto_2 = client_pb2.SignedCertificateTimestamp()
sct_proto_2.CopyFrom(self._sct_proto)
sct_proto_2.timestamp = 1365427530000
second_sct = tls_message.encode(sct_proto_2)
sct_list = client_pb2.SignedCertificateTimestampList()
sct_list.sct_list.extend([first_sct, second_sct])
encoded_sct_list = tls_message.encode(sct_list)
# First 2 bytes are list length prefix - 240 bytes in total
# Next 2 bytes are the length of the first SCT: 118
self.assertEqual(encoded_sct_list[:4],
"00f00076".decode("hex"))
first_sct_end = len(first_sct) + 4
# The actual SCT
self.assertEqual(encoded_sct_list[4:first_sct_end], first_sct)
# Next 2 bytes are the length of the second SCT (118 again)
self.assertEqual(encoded_sct_list[first_sct_end:first_sct_end+2],
"0076".decode("hex"))
# The 2nd SCT
self.assertEqual(encoded_sct_list[first_sct_end+2:], second_sct)
if __name__ == "__main__":
unittest.main()
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