def test__getNextRecord_with_too_big_record(self):
mockSock = MockSocket(
bytearray(b'\x16' + # type - handshake
b'\x03\x03' + # TLSv1.2
b'\xff\xff' + # length
b'\x00' * 65536))
sock = TLSRecordLayer(mockSock)
# XXX using private method!
gen = sock._getNextRecord()
with self.assertRaises(TLSLocalAlert) as context:
next(gen)
self.assertEqual(str(context.exception), "record_overflow")
def test__getNextRecord_with_empty_handshake(self):
mock_sock = MockSocket(
bytearray(b'\x16' + # handshake
b'\x03\x03' + # TLSv1.2
b'\x00\x00' # length
))
record_layer = TLSRecordLayer(mock_sock)
with self.assertRaises(TLSLocalAlert):
for result in record_layer._getNextRecord():
if result in (0, 1):
raise Exception("blocking socket")
else:
break
def test__getNextRecord_with_malformed_record(self):
mockSock = MockSocket(
bytearray(b'\x01' + # wrong type
b'\x03\x03' + # TLSv1.2
b'\x00\x01' + # length
b'\x00'))
sock = TLSRecordLayer(mockSock)
# XXX using private method!
gen = sock._getNextRecord()
with self.assertRaises(TLSLocalAlert) as context:
next(gen)
self.assertEqual(str(context.exception), "illegal_parameter")
def test_keyingMaterialExporter_tls1_3_sha256(self):
sock = MockSocket(bytearray(0))
conn = TLSConnection(sock)
conn._recordLayer.version = (3, 4)
conn.session = Session()
conn.session.cipherSuite = \
CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
conn.session.exporterMasterSecret = \
bytearray(b'0123456789abcdef0123456789abcdef' +
b'0123456789abcdef0123456789abcdef')
mat = conn.keyingMaterialExporter(bytearray(b'test'), 20)
self.assertEqual(
mat,
bytearray(
b'W_h\x10\x83\xc0XD\x0fw\x0e\xfc/\x92\x8f\xb3\xfd\x13\x96\xd9')
)
def test_recvMessage(self):
defragmenter = Defragmenter()
defragmenter.addStaticSize(21, 2)
sock = MockSocket(bytearray(
b'\x15' + # message type
b'\x03\x03' + # TLS version
b'\x00\x04' + # payload length
b'\xff\xff' + # first message
b'\xbb\xbb' # second message
))
msgSock = MessageSocket(sock, defragmenter)
for res in msgSock.recvMessage():
if res in (0, 1):
self.assertTrue(False, "Blocking read")
else:
break
self.assertIsNotNone(res)
header, parser = res
self.assertEqual(header.type, 21)
self.assertEqual(header.version, (3, 3))
self.assertEqual(header.length, 0)
self.assertEqual(parser.bytes, bytearray(b'\xff\xff'))
res = None
for res in msgSock.recvMessage():
if res in (0, 1):
self.assertTrue(False, "Blocking read")
else:
break
self.assertIsNotNone(res)
header, parser = res
self.assertEqual(header.type, 21)
self.assertEqual(header.version, (3, 3))
self.assertEqual(header.length, 0)
self.assertEqual(parser.bytes, bytearray(b'\xbb\xbb'))
def test_queueMessage_with_conflicting_types(self):
sock = MockSocket(bytearray())
msgSock = MessageSocket(sock, None)
msgSock.version = (3, 3)
msg = Message(ContentType.handshake, bytearray(b'\xaa\xaa\xaa'))
for res in msgSock.queueMessage(msg):
if res in (0, 1):
self.assertTrue(False, "Blocking queue")
else:
break
self.assertEqual(len(sock.sent), 0)
msg = Message(ContentType.alert, bytearray(b'\x02\x01'))
for res in msgSock.queueMessage(msg):
if res in (0, 1):
self.assertTrue(False, "Blocking queue")
else:
break
self.assertEqual(len(sock.sent), 1)
self.assertEqual(bytearray(
b'\x16' +
b'\x03\x03' +
b'\x00\x03' +
b'\xaa'*3), sock.sent[0])
for res in msgSock.flush():
if res in (0, 1):
self.assertTrue(False, "Blocking flush")
else:
break
self.assertEqual(len(sock.sent), 2)
self.assertEqual(bytearray(
b'\x15' +
b'\x03\x03' +
b'\x00\x02' +
b'\x02\x01'), sock.sent[1])
def test_flushBlocking_with_data(self):
sock = MockSocket(bytearray(), blockEveryOther=True)
sock.blockWrite = True
msgSock = MessageSocket(sock, None)
msgSock.version = (3, 3)
msg = Message(ContentType.handshake, bytearray(b'\xaa\xaa\xaa'))
msgSock.queueMessageBlocking(msg)
self.assertEqual(len(sock.sent), 0)
msgSock.flushBlocking()
self.assertEqual(len(sock.sent), 1)
self.assertEqual(
bytearray(b'\x16' + b'\x03\x03' + b'\x00\x03' + b'\xaa' * 3),
sock.sent[0])
def test_flush(self):
sock = MockSocket(bytearray())
msgSock = MessageSocket(sock, None)
for res in msgSock.flush():
if res in (0, 1):
self.assertTrue(False, "Blocking flush")
else:
break
self.assertEqual(len(sock.sent), 0)
for res in msgSock.flush():
if res in (0, 1):
self.assertTrue(False, "Blocking flush")
else:
break
self.assertEqual(len(sock.sent), 0)
def test_sendMessage(self):
sock = MockSocket(bytearray(), blockEveryOther=True)
sock.blockWrite = True
msgSock = MessageSocket(sock, None)
msgSock.version = (3, 3)
msg = Message(ContentType.handshake, bytearray(b'\xaa\xaa\xaa'))
blocked = False
for res in msgSock.queueMessage(msg):
if res in (0, 1):
blocked = True
else:
break
# no write so no blocking
self.assertFalse(blocked)
self.assertEqual(len(sock.sent), 0)
msg = Message(ContentType.alert, bytearray(b'\x02\x01'))
blocked = False
for res in msgSock.sendMessage(msg):
if res in (0, 1):
blocked = True
else:
break
self.assertTrue(blocked)
self.assertEqual(len(sock.sent), 2)
self.assertEqual(bytearray(
b'\x16' +
b'\x03\x03' +
b'\x00\x03' +
b'\xaa'*3), sock.sent[0])
self.assertEqual(bytearray(
b'\x15' +
b'\x03\x03' +
b'\x00\x02' +
b'\x02\x01'), sock.sent[1])
def test__getNextRecord_with_trickling_socket(self):
mockSock = MockSocket(
bytearray(b'\x16' + # type - handshake
b'\x03\x03' + # TLSv1.2
b'\x00\x04' + # length
b'\x00' * 4),
maxRet=1)
sock = TLSRecordLayer(mockSock)
# XXX using private method!
for result in sock._getNextRecord():
if result in (0, 1):
self.assertTrue(False, "blocking socket")
else:
break
header, data = result
data = data.bytes
self.assertEqual(bytearray(4), data)
def test__getMsg_with_fragmented_message(self):
mock_sock = MockSocket(
bytearray(b'\x16' + # handshake
b'\x03\x03' + # TLSv1.2
b'\x00\x06' + # payload length
b'\x02' + # Server Hello
b'\x00\x00\x36' + # hello length
b'\x03\x03' + # TLSv1.2
# fragment end
b'\x16' + # type - handshake
b'\x03\x03' + # TLSv1.2
b'\x00\x34' + # payload length:
b'\x00' * 32 + # random
b'\x00' + # session ID length
b'\x00\x2f' + # cipher suite selected (AES128-SHA)
b'\x00' + # compression null
b'\x00\x0e' + # extensions length
b'\xff\x01' + # renegotiation_info
b'\x00\x01' + # ext length
b'\x00' + # renegotiation info ext length - 0
b'\x00\x23' + # session_ticket
b'\x00\x00' + # ext length
b'\x00\x0f' + # heartbeat extension
b'\x00\x01' + # ext length
b'\x01')) # peer is allowed to send requests
record_layer = TLSRecordLayer(mock_sock)
gen = record_layer._getMsg(ContentType.handshake,
HandshakeType.server_hello)
message = next(gen)
if message in (0, 1):
raise Exception("blocking")
self.assertEqual(ServerHello, type(message))
self.assertEqual((3, 3), message.server_version)
self.assertEqual(0x002f, message.cipher_suite)
def test__sendMsg_with_large_message(self):
mock_sock = MockSocket(bytearray(0))
record_layer = TLSRecordLayer(mock_sock)
client_hello = ClientHello().create(
(3, 3), bytearray(32), bytearray(0), [x for x in range(2**15 - 1)])
gen = record_layer._sendMsg(client_hello)
for result in gen:
if result in (0, 1):
self.assertTrue(False, "blocking")
else:
break
# The maximum length that can be sent in single record is 2**14
# record layer adds 5 byte on top of that
self.assertEqual(len(mock_sock.sent), 5)
for msg in mock_sock.sent:
self.assertTrue(len(msg) <= 2**14 + 5)
def test__sendMsg(self):
mockSock = MockSocket(bytearray(0))
sock = TLSRecordLayer(mockSock)
sock.version = (3, 3)
msg = Message(ContentType.handshake, bytearray(10))
# XXX using private method
for result in sock._sendMsg(msg, False):
if result in (0, 1):
self.assertTrue(False, "Blocking socket")
else:
break
self.assertEqual(len(mockSock.sent), 1)
self.assertEqual(
bytearray(b'\x16' + # handshake message
b'\x03\x03' + # version
b'\x00\x0a' + # payload length
b'\x00' * 10 # payload
),
mockSock.sent[0])
def test_queueMessage(self):
sock = MockSocket(bytearray())
msgSocket = MessageSocket(sock, None)
msg = Message(ContentType.alert, bytearray(b'\xff\xbb'))
for res in msgSocket.queueMessage(msg):
if res in (0, 1):
self.assertTrue(False, "Blocking queue")
else:
break
self.assertEqual(len(sock.sent), 0)
msg = Message(ContentType.alert, bytearray(b'\xff\xaa'))
for res in msgSocket.queueMessage(msg):
if res in (0, 1):
self.assertTrue(False, "Blocking queue")
else:
break
self.assertEqual(len(sock.sent), 0)
for res in msgSocket.flush():
if res in (0, 1):
self.assertTrue(False, "Blocking flush")
else:
break
self.assertEqual(len(sock.sent), 1)
self.assertEqual(sock.sent[0], bytearray(
b'\x15' +
b'\x00\x00' +
b'\x00\x04' +
b'\xff\xbb' +
b'\xff\xaa'))
def test_write_with_BEAST_record_splitting_and_empty_write(self):
mock_sock = MockSocket(bytearray(0))
record_layer = TLSRecordLayer(mock_sock)
record_layer.version = (3, 1)
record_layer.closed = False
record_layer._recordLayer.calcPendingStates(
CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA, bytearray(48),
bytearray(32), bytearray(32), None)
record_layer._recordLayer.changeWriteState()
record_layer.write(bytearray(0))
self.assertEqual(len(mock_sock.sent), 1)
msg1 = mock_sock.sent[0]
self.assertEqual(
bytearray(
b'\x17' + # application data
b'\x03\x01' + # TLSv1.0
b'\x00\x20' # length 32 bytes = data(0) + MAC(20) + padding(12)
),
msg1[:5])
self.assertEqual(len(msg1[5:]), 32)
def test__getNextRecord(self):
mockSock = MockSocket(
bytearray(b'\x16' + # type - handshake
b'\x03\x03' + # TLSv1.2
b'\x00\x04' + # length
b'\x00' * 4))
sock = TLSRecordLayer(mockSock)
sock.version = (3, 3)
# XXX using private method!
for result in sock._getNextRecord():
if result in (0, 1):
self.assertTrue(False, "blocking socket")
else:
break
header, data = result
data = data.bytes
self.assertEqual(data, bytearray(4))
self.assertEqual(header.type, ContentType.handshake)
self.assertEqual(header.version, (3, 3))
self.assertEqual(header.length, 0)
def test_recvMessageBlocking(self):
defragmenter = Defragmenter()
defragmenter.addStaticSize(21, 2)
sock = MockSocket(bytearray(
b'\x15' + # message type
b'\x03\x03' + # TLS version
b'\x00\x02' + # payload length
b'\xff\xff' # message
),
blockEveryOther=True,
maxRet=1)
msgSock = MessageSocket(sock, defragmenter)
res = msgSock.recvMessageBlocking()
self.assertIsNotNone(res)
header, parser = res
self.assertEqual(header.type, 21)
self.assertEqual(parser.bytes, bytearray(b'\xff\xff'))
def test__getNextRecord_with_slow_socket(self):
mockSock = MockSocket(
bytearray(b'\x16' + # type - handshake
b'\x03\x03' + # TLSv1.2
b'\x00\x04' + # length
b'\x00' * 4),
maxRet=1,
blockEveryOther=True)
sock = TLSRecordLayer(mockSock)
gotRetry = False
# XXX using private method!
for result in sock._getNextRecord():
if result in (0, 1):
gotRetry = True
else:
break
header, data = result
data = data.bytes
self.assertTrue(gotRetry)
self.assertEqual(bytearray(4), data)
def test__getNextRecord_with_SSL2_record(self):
mockSock = MockSocket(
bytearray(b'\x80' + # tag
b'\x04' + # length
b'\x00' * 4))
sock = TLSRecordLayer(mockSock)
# XXX using private method!
for result in sock._getNextRecord():
if result in (0, 1):
self.assertTrue(False, "blocking socket")
else:
break
header, data = result
data = data.bytes
self.assertTrue(header.ssl2)
self.assertEqual(ContentType.handshake, header.type)
self.assertEqual(4, header.length)
self.assertEqual((2, 0), header.version)
self.assertEqual(bytearray(4), data)
def test(self):
sock = MockSocket(server_hello_ciphertext)
record_layer = RecordLayer(sock)
ext = [SNIExtension().create(bytearray(b'server')),
TLSExtension(extType=ExtensionType.renegotiation_info)
.create(bytearray(b'\x00')),
SupportedGroupsExtension().create([GroupName.x25519,
GroupName.secp256r1,
GroupName.secp384r1,
GroupName.secp521r1,
GroupName.ffdhe2048,
GroupName.ffdhe3072,
GroupName.ffdhe4096,
GroupName.ffdhe6144,
GroupName.ffdhe8192]),
ECPointFormatsExtension().create([ECPointFormat.uncompressed]),
TLSExtension(extType=35),
ClientKeyShareExtension().create([KeyShareEntry().create(GroupName.x25519,
client_key_public,
client_key_private)]),
SupportedVersionsExtension().create([TLS_1_3_DRAFT,
(3, 3), (3, 2)]),
SignatureAlgorithmsExtension().create([(HashAlgorithm.sha256,
SignatureAlgorithm.ecdsa),
(HashAlgorithm.sha384,
SignatureAlgorithm.ecdsa),
(HashAlgorithm.sha512,
SignatureAlgorithm.ecdsa),
(HashAlgorithm.sha1,
SignatureAlgorithm.ecdsa),
SignatureScheme.rsa_pss_sha256,
SignatureScheme.rsa_pss_sha384,
SignatureScheme.rsa_pss_sha512,
SignatureScheme.rsa_pkcs1_sha256,
SignatureScheme.rsa_pkcs1_sha384,
SignatureScheme.rsa_pkcs1_sha512,
SignatureScheme.rsa_pkcs1_sha1,
(HashAlgorithm.sha256,
SignatureAlgorithm.dsa),
(HashAlgorithm.sha384,
SignatureAlgorithm.dsa),
(HashAlgorithm.sha512,
SignatureAlgorithm.dsa),
(HashAlgorithm.sha1,
SignatureAlgorithm.dsa)]),
TLSExtension(extType=45).create(bytearray(b'\x01\x01')),
TLSExtension(extType=ExtensionType.client_hello_padding)
.create(bytearray(252))
]
client_hello = ClientHello()
client_hello.create((3, 3),
bytearray(b'\xaf!\x15k\x04\xdbc\x9ef\x15J\x1f\xe5'
b'\xad\xfa\xea\xdf\x9eA4\x16\x00\rW\xb8'
b'\xe1\x12mM\x11\x9a\x8b'),
bytearray(b''),
[CipherSuite.TLS_AES_128_GCM_SHA256,
CipherSuite.TLS_CHACHA20_POLY1305_SHA256,
CipherSuite.TLS_AES_256_GCM_SHA384,
CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
0xCCA9,
CipherSuite.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
CipherSuite.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
CipherSuite.TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,
CipherSuite.TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
CipherSuite.TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
0x0032,
CipherSuite.TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,
CipherSuite.TLS_DHE_RSA_WITH_AES_256_CBC_SHA,
0x0038,
CipherSuite.TLS_DHE_RSA_WITH_AES_256_CBC_SHA256,
CipherSuite.TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA,
0x0013,
CipherSuite.TLS_RSA_WITH_AES_128_GCM_SHA256,
CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA,
CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA256,
CipherSuite.TLS_RSA_WITH_AES_256_CBC_SHA,
CipherSuite.TLS_RSA_WITH_AES_256_CBC_SHA256,
CipherSuite.TLS_RSA_WITH_3DES_EDE_CBC_SHA,
CipherSuite.TLS_RSA_WITH_RC4_128_SHA,
CipherSuite.TLS_RSA_WITH_RC4_128_MD5],
extensions=ext)
self.assertEqual(client_hello.write(), client_hello_ciphertext[5:])
for result in record_layer.recvRecord():
# check if non-blocking
self.assertNotIn(result, (0, 1))
header, parser = result
hs_type = parser.get(1)
self.assertEqual(hs_type, HandshakeType.server_hello)
server_hello = ServerHello().parse(parser)
self.assertEqual(server_hello.server_version, TLS_1_3_DRAFT)
self.assertEqual(server_hello.cipher_suite, CipherSuite.TLS_AES_128_GCM_SHA256)
server_key_share = server_hello.getExtension(ExtensionType.key_share)
server_key_share = server_key_share.server_share
self.assertEqual(server_key_share.group, GroupName.x25519)
# for TLS_AES_128_GCM_SHA256:
prf_name = 'sha256'
prf_size = 256 // 8
secret = bytearray(prf_size)
psk = bytearray(prf_size)
# early secret
secret = secureHMAC(secret, psk, prf_name)
self.assertEqual(secret,
str_to_bytearray(
"33ad0a1c607ec03b 09e6cd9893680ce2"
"10adf300aa1f2660 e1b22e10f170f92a"))
# derive secret for handshake
secret = derive_secret(secret, b"derived", None, prf_name)
self.assertEqual(secret,
str_to_bytearray(
"6f2615a108c702c5 678f54fc9dbab697"
"16c076189c48250c ebeac3576c3611ba"))
# extract secret "handshake"
Z = x25519(client_key_private, server_key_share.key_exchange)
self.assertEqual(Z,
str_to_bytearray(
"f677c3cdac26a755 455b130efa9b1a3f"
"3cafb153544ca46a ddf670df199d996e"))
secret = secureHMAC(secret, Z, prf_name)
self.assertEqual(secret,
str_to_bytearray(
"0cefce00d5d29fd0 9f5de36c86fc8e72"
"99b4ad11ba4211c6 7063c2cc539fc4f9"))
handshake_hashes = HandshakeHashes()
handshake_hashes.update(client_hello_plaintext)
handshake_hashes.update(server_hello_payload)
# derive "tls13 c hs traffic"
c_hs_traffic = derive_secret(secret,
bytearray(b'c hs traffic'),
handshake_hashes,
prf_name)
self.assertEqual(c_hs_traffic,
str_to_bytearray(
"5a63db760b817b1b da96e72832333aec"
"6a177deeadb5b407 501ac10c17dac0a4"))
s_hs_traffic = derive_secret(secret,
bytearray(b's hs traffic'),
handshake_hashes,
prf_name)
self.assertEqual(s_hs_traffic,
str_to_bytearray(
"3aa72a3c77b791e8 f4de243f9ccce172"
"941f8392aeb05429 320f4b572ccfe744"))
# derive master secret
secret = derive_secret(secret, b"derived", None, prf_name)
self.assertEqual(secret,
str_to_bytearray(
"32cadf38f3089048 5c54bf4f1184eaa5"
"569eeef15a43f3c7 6ab33965a47c9ff6"))
# extract secret "master
secret = secureHMAC(secret, bytearray(prf_size), prf_name)
self.assertEqual(secret,
str_to_bytearray(
"6c6d4b3e7c925460 82d7b7a32f6ce219"
"3804f1bb930fed74 5c6b93c71397f424"))
def prepare_mock_socket_with_handshake_failure(self):
alertObj = Alert().create(AlertDescription.handshake_failure)
alert = alertObj.write()
header = RecordHeader3().create((3, 3), ContentType.alert, len(alert))
return MockSocket(header.write() + alert)
def test(self):
sock = MockSocket(server_hello_ciphertext)
record_layer = RecordLayer(sock)
ext = [
SNIExtension().create(bytearray(b'server')),
TLSExtension(extType=ExtensionType.renegotiation_info).create(
bytearray(b'\x00')),
SupportedGroupsExtension().create([
GroupName.x25519, GroupName.secp256r1, GroupName.secp384r1,
GroupName.secp521r1, GroupName.ffdhe2048, GroupName.ffdhe3072,
GroupName.ffdhe4096, GroupName.ffdhe6144, GroupName.ffdhe8192
]),
TLSExtension(extType=35),
ClientKeyShareExtension().create([
KeyShareEntry().create(GroupName.x25519, client_key_public,
client_key_private)
]),
SupportedVersionsExtension().create([(3, 4)]),
SignatureAlgorithmsExtension().create([
SignatureScheme.ecdsa_secp256r1_sha256,
SignatureScheme.ecdsa_secp384r1_sha384,
SignatureScheme.ecdsa_secp521r1_sha512,
(HashAlgorithm.sha1, SignatureAlgorithm.ecdsa),
SignatureScheme.rsa_pss_rsae_sha256,
SignatureScheme.rsa_pss_rsae_sha384,
SignatureScheme.rsa_pss_rsae_sha512,
SignatureScheme.rsa_pkcs1_sha256,
SignatureScheme.rsa_pkcs1_sha384,
SignatureScheme.rsa_pkcs1_sha512,
SignatureScheme.rsa_pkcs1_sha1,
(HashAlgorithm.sha256, SignatureAlgorithm.dsa),
(HashAlgorithm.sha384, SignatureAlgorithm.dsa),
(HashAlgorithm.sha512, SignatureAlgorithm.dsa),
(HashAlgorithm.sha1, SignatureAlgorithm.dsa)
]),
TLSExtension(extType=45).create(bytearray(b'\x01\x01')),
RecordSizeLimitExtension().create(16385)
]
client_hello = ClientHello()
client_hello.create((3, 3),
bytearray(b'\xcb4\xec\xb1\xe7\x81c'
b'\xba\x1c8\xc6\xda\xcb'
b'\x19jm\xff\xa2\x1a\x8d'
b'\x99\x12\xec\x18\xa2'
b'\xefb\x83\x02M\xec\xe7'),
bytearray(b''), [
CipherSuite.TLS_AES_128_GCM_SHA256,
CipherSuite.TLS_CHACHA20_POLY1305_SHA256,
CipherSuite.TLS_AES_256_GCM_SHA384
],
extensions=ext)
self.assertEqual(client_hello.write(), client_hello_ciphertext[5:])
for result in record_layer.recvRecord():
# check if non-blocking
self.assertNotIn(result, (0, 1))
break
header, parser = result
hs_type = parser.get(1)
self.assertEqual(hs_type, HandshakeType.server_hello)
server_hello = ServerHello().parse(parser)
self.assertEqual(server_hello.server_version, (3, 3))
self.assertEqual(server_hello.cipher_suite,
CipherSuite.TLS_AES_128_GCM_SHA256)
server_key_share = server_hello.getExtension(ExtensionType.key_share)
server_key_share = server_key_share.server_share
self.assertEqual(server_key_share.group, GroupName.x25519)
# for TLS_AES_128_GCM_SHA256:
prf_name = 'sha256'
prf_size = 256 // 8
secret = bytearray(prf_size)
psk = bytearray(prf_size)
# early secret
secret = secureHMAC(secret, psk, prf_name)
self.assertEqual(
secret,
clean("""
33 ad 0a 1c 60 7e c0 3b 09 e6 cd 98 93 68 0c
e2 10 ad f3 00 aa 1f 26 60 e1 b2 2e 10 f1 70 f9 2a
"""))
# derive secret for handshake
secret = derive_secret(secret, b"derived", None, prf_name)
self.assertEqual(
secret,
clean("""
6f 26 15 a1 08 c7 02 c5 67 8f 54 fc 9d ba
b6 97 16 c0 76 18 9c 48 25 0c eb ea c3 57 6c 36 11 ba
"""))
# extract secret "handshake"
Z = x25519(client_key_private, server_key_share.key_exchange)
self.assertEqual(
Z,
clean("""
8b d4 05 4f b5 5b 9d 63 fd fb ac f9 f0 4b 9f 0d
35 e6 d6 3f 53 75 63 ef d4 62 72 90 0f 89 49 2d
"""))
secret = secureHMAC(secret, Z, prf_name)
self.assertEqual(
secret,
clean("""
1d c8 26 e9 36 06 aa 6f dc 0a ad c1 2f 74 1b
01 04 6a a6 b9 9f 69 1e d2 21 a9 f0 ca 04 3f be ac
"""))
handshake_hashes = HandshakeHashes()
handshake_hashes.update(client_hello_plaintext)
handshake_hashes.update(server_hello_payload)
# derive "tls13 c hs traffic"
c_hs_traffic = derive_secret(secret, bytearray(b'c hs traffic'),
handshake_hashes, prf_name)
self.assertEqual(
c_hs_traffic,
clean("""
b3 ed db 12 6e 06 7f 35 a7 80 b3 ab f4 5e
2d 8f 3b 1a 95 07 38 f5 2e 96 00 74 6a 0e 27 a5 5a 21
"""))
s_hs_traffic = derive_secret(secret, bytearray(b's hs traffic'),
handshake_hashes, prf_name)
self.assertEqual(
s_hs_traffic,
clean("""
b6 7b 7d 69 0c c1 6c 4e 75 e5 42 13 cb 2d
37 b4 e9 c9 12 bc de d9 10 5d 42 be fd 59 d3 91 ad 38
"""))
# derive master secret
secret = derive_secret(secret, b"derived", None, prf_name)
self.assertEqual(
secret,
clean("""
43 de 77 e0 c7 77 13 85 9a 94 4d b9 db 25
90 b5 31 90 a6 5b 3e e2 e4 f1 2d d7 a0 bb 7c e2 54 b4
"""))
# extract secret "master"
secret = secureHMAC(secret, bytearray(prf_size), prf_name)
self.assertEqual(
secret,
clean("""
18 df 06 84 3d 13 a0 8b f2 a4 49 84 4c 5f 8a
47 80 01 bc 4d 4c 62 79 84 d5 a4 1d a8 d0 40 29 19
"""))
# derive write keys for handshake data
server_hs_write_trafic_key = HKDF_expand_label(s_hs_traffic, b"key",
b"", 16, prf_name)
self.assertEqual(
server_hs_write_trafic_key,
clean("""
3f ce 51 60 09 c2 17 27 d0 f2 e4 e8 6e
e4 03 bc
"""))
server_hs_write_trafic_iv = HKDF_expand_label(s_hs_traffic, b"iv", b"",
12, prf_name)
self.assertEqual(
server_hs_write_trafic_iv,
clean("""
5d 31 3e b2 67 12 76 ee 13 00 0b 30
"""))
# derive key for Finished message
server_finished_key = HKDF_expand_label(s_hs_traffic, b"finished", b"",
prf_size, prf_name)
self.assertEqual(
server_finished_key,
clean("""
00 8d 3b 66 f8 16 ea 55 9f 96 b5 37 e8 85
c3 1f c0 68 bf 49 2c 65 2f 01 f2 88 a1 d8 cd c1 9f c8
"""))
# Update the handshake transcript
handshake_hashes.update(server_encrypted_extensions)
handshake_hashes.update(server_certificate_message)
handshake_hashes.update(server_certificateverify_message)
hs_transcript = handshake_hashes.digest(prf_name)
server_finished = secureHMAC(server_finished_key, hs_transcript,
prf_name)
self.assertEqual(
server_finished,
clean("""
9b 9b 14 1d 90 63 37 fb d2 cb dc e7 1d f4
de da 4a b4 2c 30 95 72 cb 7f ff ee 54 54 b7 8f 07 18
"""))
server_finished_message = Finished((3, 4)).create(server_finished)
server_finished_payload = server_finished_message.write()
# update handshake transcript to include Finished payload
handshake_hashes.update(server_finished_payload)
# derive keys for client application traffic
c_ap_traffic = derive_secret(secret, b"c ap traffic", handshake_hashes,
prf_name)
self.assertEqual(
c_ap_traffic,
clean("""
9e 40 64 6c e7 9a 7f 9d c0 5a f8 88 9b ce
65 52 87 5a fa 0b 06 df 00 87 f7 92 eb b7 c1 75 04 a5
"""))
# derive keys for server application traffic
s_ap_traffic = derive_secret(secret, b"s ap traffic", handshake_hashes,
prf_name)
self.assertEqual(
s_ap_traffic,
clean("""
a1 1a f9 f0 55 31 f8 56 ad 47 11 6b 45 a9
50 32 82 04 b4 f4 4b fb 6b 3a 4b 4f 1f 3f cb 63 16 43
"""))
# derive exporter master secret
exp_master = derive_secret(secret, b"exp master", handshake_hashes,
prf_name)
self.assertEqual(
exp_master,
clean("""
fe 22 f8 81 17 6e da 18 eb 8f 44 52 9e 67
92 c5 0c 9a 3f 89 45 2f 68 d8 ae 31 1b 43 09 d3 cf 50
"""))
# derive write traffic keys for app data
server_write_traffic_key = HKDF_expand_label(s_ap_traffic, b"key", b"",
16, prf_name)
self.assertEqual(
server_write_traffic_key,
clean("""
9f 02 28 3b 6c 9c 07 ef c2 6b b9 f2 ac
92 e3 56
"""))
server_write_traffic_iv = HKDF_expand_label(s_ap_traffic, b"iv", b"",
12, prf_name)
self.assertEqual(
server_write_traffic_iv,
clean("""
cf 78 2b 88 dd 83 54 9a ad f1 e9 84
"""))
# derive read traffic keys for app data
server_read_hs_key = HKDF_expand_label(c_hs_traffic, b"key", b"", 16,
prf_name)
self.assertEqual(
server_read_hs_key,
clean("""
db fa a6 93 d1 76 2c 5b 66 6a f5 d9 50
25 8d 01
"""))
server_read_hs_iv = HKDF_expand_label(c_hs_traffic, b"iv", b"", 12,
prf_name)
self.assertEqual(
server_read_hs_iv,
clean("""
5b d3 c7 1b 83 6e 0b 76 bb 73 26 5f
"""))