async def _do_p2p_handshake(transport: TransportAPI,
capabilities: Capabilities,
p2p_handshake_params: DevP2PHandshakeParams,
base_protocol: BaseP2PProtocol,
token: CancelToken) -> Tuple[DevP2PReceipt, BaseP2PProtocol]:
client_version_string, listen_port, p2p_version = p2p_handshake_params
base_protocol.send(Hello(HelloPayload(
client_version_string=client_version_string,
capabilities=capabilities,
listen_port=listen_port,
version=p2p_version,
remote_public_key=transport.public_key.to_bytes(),
)))
# The base `p2p` protocol handshake directly streams the messages as it has
# strict requirements about receiving the `Hello` message first.
async for _, cmd in stream_transport_messages(transport, base_protocol, token=token):
if not isinstance(cmd, Hello):
raise HandshakeFailure(
f"First message across the DevP2P connection must be a Hello "
f"msg, got {cmd}, disconnecting"
)
protocol: BaseP2PProtocol
if base_protocol.version >= DEVP2P_V5:
# Check whether to support Snappy Compression or not
# based on other peer's p2p protocol version
snappy_support = cmd.payload.version >= DEVP2P_V5
if snappy_support:
# Now update the base protocol to support snappy compression
# This is needed so that Trinity is compatible with parity since
# parity sends Ping immediately after handshake
protocol = P2PProtocolV5(
transport,
command_id_offset=0,
snappy_support=True,
)
else:
protocol = base_protocol
else:
protocol = base_protocol
devp2p_receipt = DevP2PReceipt(
protocol=protocol,
version=cmd.payload.version,
client_version_string=cmd.payload.client_version_string,
capabilities=cmd.payload.capabilities,
remote_public_key=cmd.payload.remote_public_key,
listen_port=cmd.payload.listen_port,
)
break
else:
raise HandshakeFailure("DevP2P message stream exited before finishing handshake")
return devp2p_receipt, protocol
async def test_handshake():
# TODO: this test should be re-written to not depend on functionality in the `ETHPeer` class.
cancel_token = CancelToken("test_handshake")
use_eip8 = False
initiator_remote = kademlia.Node(
keys.PrivateKey(test_values['receiver_private_key']).public_key,
kademlia.Address('0.0.0.0', 0, 0))
initiator = HandshakeInitiator(
initiator_remote,
keys.PrivateKey(test_values['initiator_private_key']), use_eip8,
cancel_token)
initiator.ephemeral_privkey = keys.PrivateKey(
test_values['initiator_ephemeral_private_key'])
responder_remote = kademlia.Node(
keys.PrivateKey(test_values['initiator_private_key']).public_key,
kademlia.Address('0.0.0.0', 0, 0))
responder = HandshakeResponder(
responder_remote, keys.PrivateKey(test_values['receiver_private_key']),
use_eip8, cancel_token)
responder.ephemeral_privkey = keys.PrivateKey(
test_values['receiver_ephemeral_private_key'])
# Check that the auth message generated by the initiator is what we expect. Notice that we
# can't use the auth_init generated here because the non-deterministic prefix would cause the
# derived secrets to not match the expected values.
_auth_init = initiator.create_auth_message(test_values['initiator_nonce'])
assert len(_auth_init) == len(test_values['auth_plaintext'])
assert _auth_init[65:] == test_values['auth_plaintext'][
65:] # starts with non deterministic k
# Check that encrypting and decrypting the auth_init gets us the orig msg.
_auth_init_ciphertext = initiator.encrypt_auth_message(_auth_init)
assert _auth_init == ecies.decrypt(_auth_init_ciphertext,
responder.privkey)
# Check that the responder correctly decodes the auth msg.
auth_msg_ciphertext = test_values['auth_ciphertext']
initiator_ephemeral_pubkey, initiator_nonce, _ = decode_authentication(
auth_msg_ciphertext, responder.privkey)
assert initiator_nonce == test_values['initiator_nonce']
assert initiator_ephemeral_pubkey == (keys.PrivateKey(
test_values['initiator_ephemeral_private_key']).public_key)
# Check that the auth_ack msg generated by the responder is what we expect.
auth_ack_msg = responder.create_auth_ack_message(
test_values['receiver_nonce'])
assert auth_ack_msg == test_values['authresp_plaintext']
# Check that the secrets derived from ephemeral key agreements match the expected values.
auth_ack_ciphertext = test_values['authresp_ciphertext']
aes_secret, mac_secret, egress_mac, ingress_mac = responder.derive_secrets(
initiator_nonce, test_values['receiver_nonce'],
initiator_ephemeral_pubkey, auth_msg_ciphertext, auth_ack_ciphertext)
assert aes_secret == test_values['aes_secret']
assert mac_secret == test_values['mac_secret']
# Test values are from initiator perspective, so they're reversed here.
assert ingress_mac.digest() == test_values['initial_egress_MAC']
assert egress_mac.digest() == test_values['initial_ingress_MAC']
# Check that the initiator secrets match as well.
responder_ephemeral_pubkey, responder_nonce = initiator.decode_auth_ack_message(
test_values['authresp_ciphertext'])
(initiator_aes_secret, initiator_mac_secret, initiator_egress_mac,
initiator_ingress_mac) = initiator.derive_secrets(
initiator_nonce, responder_nonce, responder_ephemeral_pubkey,
auth_msg_ciphertext, auth_ack_ciphertext)
assert initiator_aes_secret == aes_secret
assert initiator_mac_secret == mac_secret
assert initiator_ingress_mac.digest() == test_values['initial_ingress_MAC']
assert initiator_egress_mac.digest() == test_values['initial_egress_MAC']
# Finally, check that two Peers configured with the secrets generated above understand each
# other.
(
(responder_reader, responder_writer),
(initiator_reader, initiator_writer),
) = get_directly_connected_streams()
capabilities = (('paragon', 1), )
initiator_transport = Transport(remote=initiator_remote,
private_key=initiator.privkey,
reader=initiator_reader,
writer=initiator_writer,
aes_secret=initiator_aes_secret,
mac_secret=initiator_mac_secret,
egress_mac=initiator_egress_mac,
ingress_mac=initiator_ingress_mac)
initiator_p2p_protocol = P2PProtocolV5(initiator_transport, 0, False)
initiator_multiplexer = Multiplexer(
transport=initiator_transport,
base_protocol=initiator_p2p_protocol,
protocols=(),
)
initiator_multiplexer.get_base_protocol().send(
Hello(
HelloPayload(
client_version_string='initiator',
capabilities=capabilities,
listen_port=30303,
version=DEVP2P_V5,
remote_public_key=initiator.privkey.public_key.to_bytes(),
)))
responder_transport = Transport(
remote=responder_remote,
private_key=responder.privkey,
reader=responder_reader,
writer=responder_writer,
aes_secret=aes_secret,
mac_secret=mac_secret,
egress_mac=egress_mac,
ingress_mac=ingress_mac,
)
responder_p2p_protocol = P2PProtocolV5(responder_transport, 0, False)
responder_multiplexer = Multiplexer(
transport=responder_transport,
base_protocol=responder_p2p_protocol,
protocols=(),
)
responder_multiplexer.get_base_protocol().send(
Hello(
HelloPayload(
client_version_string='responder',
capabilities=capabilities,
listen_port=30303,
version=DEVP2P_V5,
remote_public_key=responder.privkey.public_key.to_bytes(),
)))
async with initiator_multiplexer.multiplex():
async with responder_multiplexer.multiplex():
initiator_stream = initiator_multiplexer.stream_protocol_messages(
initiator_p2p_protocol, )
responder_stream = responder_multiplexer.stream_protocol_messages(
responder_p2p_protocol, )
initiator_hello = await asyncio.wait_for(
initiator_stream.asend(None), timeout=0.1)
responder_hello = await asyncio.wait_for(
responder_stream.asend(None), timeout=0.1)
await initiator_stream.aclose()
await responder_stream.aclose()
assert isinstance(responder_hello, Hello)
assert isinstance(initiator_hello, Hello)
async def test_handshake_eip8():
cancel_token = CancelToken("test_handshake_eip8")
use_eip8 = True
initiator_remote = kademlia.Node(
keys.PrivateKey(eip8_values['receiver_private_key']).public_key,
kademlia.Address('0.0.0.0', 0, 0))
initiator = HandshakeInitiator(
initiator_remote,
keys.PrivateKey(eip8_values['initiator_private_key']), use_eip8,
cancel_token)
initiator.ephemeral_privkey = keys.PrivateKey(
eip8_values['initiator_ephemeral_private_key'])
responder_remote = kademlia.Node(
keys.PrivateKey(eip8_values['initiator_private_key']).public_key,
kademlia.Address('0.0.0.0', 0, 0))
responder = HandshakeResponder(
responder_remote, keys.PrivateKey(eip8_values['receiver_private_key']),
use_eip8, cancel_token)
responder.ephemeral_privkey = keys.PrivateKey(
eip8_values['receiver_ephemeral_private_key'])
auth_init_ciphertext = eip8_values['auth_init_ciphertext']
# Check that we can decrypt/decode the EIP-8 auth init message.
initiator_ephemeral_pubkey, initiator_nonce, _ = decode_authentication(
auth_init_ciphertext, responder.privkey)
assert initiator_nonce == eip8_values['initiator_nonce']
assert initiator_ephemeral_pubkey == (keys.PrivateKey(
eip8_values['initiator_ephemeral_private_key']).public_key)
responder_nonce = eip8_values['receiver_nonce']
auth_ack_ciphertext = eip8_values['auth_ack_ciphertext']
aes_secret, mac_secret, egress_mac, ingress_mac = responder.derive_secrets(
initiator_nonce, responder_nonce, initiator_ephemeral_pubkey,
auth_init_ciphertext, auth_ack_ciphertext)
# Check that the secrets derived by the responder match the expected values.
assert aes_secret == eip8_values['expected_aes_secret']
assert mac_secret == eip8_values['expected_mac_secret']
# Also according to https://github.com/ethereum/EIPs/blob/master/EIPS/eip-8.md, running B's
# ingress-mac keccak state on the string "foo" yields the following hash:
ingress_mac_copy = ingress_mac.copy()
ingress_mac_copy.update(b'foo')
assert ingress_mac_copy.hexdigest() == (
'0c7ec6340062cc46f5e9f1e3cf86f8c8c403c5a0964f5df0ebd34a75ddc86db5')
responder_ephemeral_pubkey, responder_nonce = initiator.decode_auth_ack_message(
auth_ack_ciphertext)
(initiator_aes_secret, initiator_mac_secret, initiator_egress_mac,
initiator_ingress_mac) = initiator.derive_secrets(
initiator_nonce, responder_nonce, responder_ephemeral_pubkey,
auth_init_ciphertext, auth_ack_ciphertext)
# Check that the secrets derived by the initiator match the expected values.
assert initiator_aes_secret == eip8_values['expected_aes_secret']
assert initiator_mac_secret == eip8_values['expected_mac_secret']
# Finally, check that two Peers configured with the secrets generated above understand each
# other.
(
(responder_reader, responder_writer),
(initiator_reader, initiator_writer),
) = get_directly_connected_streams()
capabilities = (('testing', 1), )
initiator_transport = Transport(remote=initiator_remote,
private_key=initiator.privkey,
reader=initiator_reader,
writer=initiator_writer,
aes_secret=initiator_aes_secret,
mac_secret=initiator_mac_secret,
egress_mac=initiator_egress_mac,
ingress_mac=initiator_ingress_mac)
initiator_p2p_protocol = P2PProtocolV5(initiator_transport, 0, False)
initiator_multiplexer = Multiplexer(
transport=initiator_transport,
base_protocol=initiator_p2p_protocol,
protocols=(),
)
initiator_multiplexer.get_base_protocol().send(
Hello(
HelloPayload(
client_version_string='initiator',
capabilities=capabilities,
listen_port=30303,
version=DEVP2P_V5,
remote_public_key=initiator.privkey.public_key.to_bytes(),
)))
responder_transport = Transport(
remote=responder_remote,
private_key=responder.privkey,
reader=responder_reader,
writer=responder_writer,
aes_secret=aes_secret,
mac_secret=mac_secret,
egress_mac=egress_mac,
ingress_mac=ingress_mac,
)
responder_p2p_protocol = P2PProtocolV4(responder_transport, 0, False)
responder_multiplexer = Multiplexer(
transport=responder_transport,
base_protocol=responder_p2p_protocol,
protocols=(),
)
responder_multiplexer.get_base_protocol().send(
Hello(
HelloPayload(
client_version_string='responder',
capabilities=capabilities,
listen_port=30303,
version=DEVP2P_V4,
remote_public_key=responder.privkey.public_key.to_bytes(),
)))
async with initiator_multiplexer.multiplex():
async with responder_multiplexer.multiplex():
initiator_stream = initiator_multiplexer.stream_protocol_messages(
initiator_p2p_protocol, )
responder_stream = responder_multiplexer.stream_protocol_messages(
responder_p2p_protocol, )
initiator_hello = await initiator_stream.asend(None)
responder_hello = await responder_stream.asend(None)
await initiator_stream.aclose()
await responder_stream.aclose()
assert isinstance(responder_hello, Hello)
assert isinstance(initiator_hello, Hello)