async def establish_transport() -> TransportAPI:
aes_secret, mac_secret, egress_mac, ingress_mac = await auth._handshake(
initiator, alice_reader, alice_writer, token)
transport = Transport(
remote=alice_remote,
private_key=alice_private_key,
reader=alice_reader,
writer=alice_writer,
aes_secret=aes_secret,
mac_secret=mac_secret,
egress_mac=egress_mac,
ingress_mac=ingress_mac,
)
return transport
async def establish_transport() -> None:
aes_secret, mac_secret, egress_mac, ingress_mac = await auth._handshake(
initiator, alice_reader, alice_writer, token)
transport = Transport(
remote=alice_remote,
private_key=alice_private_key,
reader=alice_reader,
writer=alice_writer,
aes_secret=aes_secret,
mac_secret=mac_secret,
egress_mac=egress_mac,
ingress_mac=ingress_mac,
)
f_alice.set_result(transport)
handshake_finished.set()
async def do_handshake() -> None:
aes_secret, mac_secret, egress_mac, ingress_mac = await auth._handshake(
initiator, alice_reader, alice_writer, cancel_token)
transport = Transport(
remote=alice_remote,
private_key=alice_factory.privkey,
reader=alice_reader,
writer=alice_writer,
aes_secret=aes_secret,
mac_secret=mac_secret,
egress_mac=egress_mac,
ingress_mac=ingress_mac,
)
alice = alice_factory.create_peer(transport)
f_alice.set_result(alice)
handshake_finished.set()
async def test_server_incoming_connection(monkeypatch, server, event_loop):
use_eip8 = False
token = CancelToken("initiator")
initiator = HandshakeInitiator(RECEIVER_REMOTE, INITIATOR_PRIVKEY,
use_eip8, token)
reader, writer = await initiator.connect()
# Send auth init message to the server, then read and decode auth ack
aes_secret, mac_secret, egress_mac, ingress_mac = await _handshake(
initiator, reader, writer, token)
transport = Transport(
remote=RECEIVER_REMOTE,
private_key=initiator.privkey,
reader=reader,
writer=writer,
aes_secret=aes_secret,
mac_secret=mac_secret,
egress_mac=egress_mac,
ingress_mac=ingress_mac,
)
initiator_peer = ParagonPeer(
transport=transport,
context=ParagonContext(),
token=token,
)
# Perform p2p/sub-proto handshake, completing the full handshake and causing a new peer to be
# added to the server's pool.
await initiator_peer.do_p2p_handshake()
await initiator_peer.do_sub_proto_handshake()
# wait for peer to be processed
while len(server.peer_pool) == 0:
await asyncio.sleep(0)
assert len(server.peer_pool.connected_nodes) == 1
receiver_peer = list(server.peer_pool.connected_nodes.values())[0]
assert isinstance(receiver_peer, ParagonPeer)
assert initiator_peer.sub_proto is not None
assert initiator_peer.sub_proto.name == receiver_peer.sub_proto.name
assert initiator_peer.sub_proto.version == receiver_peer.sub_proto.version
# test public key here in order to not access private `_private_key` variable.
assert receiver_peer.transport.public_key == RECEIVER_PRIVKEY.public_key
async def test_server_incoming_connection(monkeypatch,
server,
event_loop,
receiver_remote,
):
use_eip8 = False
token = CancelToken("initiator")
initiator = HandshakeInitiator(receiver_remote, INITIATOR_PRIVKEY, use_eip8, token)
initiator_remote = NodeFactory(
pubkey=INITIATOR_PUBKEY,
address__ip='127.0.0.1',
)
for _ in range(10):
# The server isn't listening immediately so we give it a short grace
# period while trying to connect.
try:
reader, writer = await initiator.connect()
except ConnectionRefusedError:
await asyncio.sleep(0)
else:
break
else:
raise AssertionError("Unable to connect within 10 loops")
# Send auth init message to the server, then read and decode auth ack
aes_secret, mac_secret, egress_mac, ingress_mac = await _handshake(
initiator, reader, writer, token)
transport = Transport(
remote=receiver_remote,
private_key=initiator.privkey,
reader=reader,
writer=writer,
aes_secret=aes_secret,
mac_secret=mac_secret,
egress_mac=egress_mac,
ingress_mac=ingress_mac,
)
factory = ParagonPeerFactory(
initiator.privkey,
context=ParagonContext(),
token=token,
)
handshakers = await factory.get_handshakers()
devp2p_handshake_params = DevP2PHandshakeParamsFactory(
listen_port=initiator_remote.address.tcp_port,
)
multiplexer, devp2p_receipt, protocol_receipts = await negotiate_protocol_handshakes(
transport=transport,
p2p_handshake_params=devp2p_handshake_params,
protocol_handshakers=handshakers,
token=token,
)
connection = Connection(
multiplexer=multiplexer,
devp2p_receipt=devp2p_receipt,
protocol_receipts=protocol_receipts,
is_dial_out=False,
)
initiator_peer = factory.create_peer(connection=connection)
# wait for peer to be processed
for _ in range(100):
if len(server.peer_pool) > 0:
break
await asyncio.sleep(0)
assert len(server.peer_pool.connected_nodes) == 1
receiver_peer = list(server.peer_pool.connected_nodes.values())[0]
assert isinstance(receiver_peer, ParagonPeer)
assert initiator_peer.sub_proto is not None
assert initiator_peer.sub_proto.name == receiver_peer.sub_proto.name
assert initiator_peer.sub_proto.version == receiver_peer.sub_proto.version
assert initiator_peer.remote.pubkey == RECEIVER_PRIVKEY.public_key
async def get_directly_linked_peers_without_handshake(
alice_factory: BasePeerFactory = None,
bob_factory: BasePeerFactory = None) -> Tuple[BasePeer, BasePeer]:
"""
See get_directly_linked_peers().
Neither the P2P handshake nor the sub-protocol handshake will be performed here.
"""
cancel_token = CancelToken("get_directly_linked_peers_without_handshake")
if alice_factory is None:
alice_factory = ParagonPeerFactory(
privkey=ecies.generate_privkey(),
context=ParagonContext(),
token=cancel_token,
)
if bob_factory is None:
bob_factory = ParagonPeerFactory(
privkey=ecies.generate_privkey(),
context=ParagonContext(),
token=cancel_token,
)
alice_private_key = alice_factory.privkey
bob_private_key = bob_factory.privkey
alice_remote = kademlia.Node(bob_private_key.public_key,
kademlia.Address('0.0.0.0', 0, 0))
bob_remote = kademlia.Node(alice_private_key.public_key,
kademlia.Address('0.0.0.0', 0, 0))
use_eip8 = False
initiator = auth.HandshakeInitiator(alice_remote, alice_private_key,
use_eip8, cancel_token)
f_alice: 'asyncio.Future[BasePeer]' = asyncio.Future()
handshake_finished = asyncio.Event()
(
(alice_reader, alice_writer),
(bob_reader, bob_writer),
) = get_directly_connected_streams()
async def do_handshake() -> None:
aes_secret, mac_secret, egress_mac, ingress_mac = await auth._handshake(
initiator, alice_reader, alice_writer, cancel_token)
transport = Transport(
remote=alice_remote,
private_key=alice_factory.privkey,
reader=alice_reader,
writer=alice_writer,
aes_secret=aes_secret,
mac_secret=mac_secret,
egress_mac=egress_mac,
ingress_mac=ingress_mac,
)
alice = alice_factory.create_peer(transport)
f_alice.set_result(alice)
handshake_finished.set()
asyncio.ensure_future(do_handshake())
use_eip8 = False
responder = auth.HandshakeResponder(bob_remote, bob_private_key, use_eip8,
cancel_token)
auth_cipher = await bob_reader.read(constants.ENCRYPTED_AUTH_MSG_LEN)
initiator_ephemeral_pubkey, initiator_nonce, _ = decode_authentication(
auth_cipher, bob_private_key)
responder_nonce = keccak(os.urandom(constants.HASH_LEN))
auth_ack_msg = responder.create_auth_ack_message(responder_nonce)
auth_ack_ciphertext = responder.encrypt_auth_ack_message(auth_ack_msg)
bob_writer.write(auth_ack_ciphertext)
await handshake_finished.wait()
alice = await f_alice
aes_secret, mac_secret, egress_mac, ingress_mac = responder.derive_secrets(
initiator_nonce, responder_nonce, initiator_ephemeral_pubkey,
auth_cipher, auth_ack_ciphertext)
assert egress_mac.digest() == alice.transport._ingress_mac.digest()
assert ingress_mac.digest() == alice.transport._egress_mac.digest()
transport = Transport(
remote=bob_remote,
private_key=bob_factory.privkey,
reader=bob_reader,
writer=bob_writer,
aes_secret=aes_secret,
mac_secret=mac_secret,
egress_mac=egress_mac,
ingress_mac=ingress_mac,
)
bob = bob_factory.create_peer(transport)
return alice, bob
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)
async def TransportPairFactory(
*,
alice_remote: NodeAPI = None,
alice_private_key: keys.PrivateKey = None,
bob_remote: NodeAPI = None,
bob_private_key: keys.PrivateKey = None,
token: CancelToken = None,
use_eip8: bool = False,
) -> Tuple[TransportAPI, TransportAPI]:
if token is None:
token = CancelTokenFactory(name='TransportPairFactory')
if alice_private_key is None:
alice_private_key = PrivateKeyFactory()
if alice_remote is None:
alice_remote = NodeFactory(pubkey=alice_private_key.public_key)
if bob_private_key is None:
bob_private_key = PrivateKeyFactory()
if bob_remote is None:
bob_remote = NodeFactory(pubkey=bob_private_key.public_key)
assert alice_private_key.public_key == alice_remote.pubkey
assert bob_private_key.public_key == bob_remote.pubkey
assert alice_private_key != bob_private_key
initiator = auth.HandshakeInitiator(bob_remote, alice_private_key,
use_eip8, token)
bob_peername = (bob_remote.address.ip, bob_remote.address.udp_port,
bob_remote.address.tcp_port)
alice_peername = (alice_remote.address.ip, alice_remote.address.udp_port,
alice_remote.address.tcp_port) # noqa: E501
(
(alice_reader, alice_writer),
(bob_reader, bob_writer),
) = get_directly_connected_streams(
bob_extra_info={'peername': bob_peername},
alice_extra_info={'peername': alice_peername},
)
async def establish_transport() -> TransportAPI:
aes_secret, mac_secret, egress_mac, ingress_mac = await auth._handshake(
initiator, alice_reader, alice_writer, token)
transport = Transport(
remote=alice_remote,
private_key=alice_private_key,
reader=alice_reader,
writer=alice_writer,
aes_secret=aes_secret,
mac_secret=mac_secret,
egress_mac=egress_mac,
ingress_mac=ingress_mac,
)
return transport
alice_transport, bob_transport = await asyncio.wait_for(asyncio.gather(
establish_transport(),
Transport.receive_connection(
reader=bob_reader,
writer=bob_writer,
private_key=bob_private_key,
token=token,
),
),
timeout=1)
return alice_transport, bob_transport
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()
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_peer = ParagonPeer(
transport=initiator_transport,
context=ParagonContext(),
)
initiator_peer.base_protocol.send_handshake(
client_version_string=initiator_peer.context.client_version_string,
capabilities=initiator_peer.capabilities,
listen_port=initiator_peer.context.listen_port,
)
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_peer = ParagonPeer(
transport=responder_transport,
context=ParagonContext(),
)
responder_peer.base_protocol.send_handshake(
client_version_string=responder_peer.context.client_version_string,
capabilities=responder_peer.capabilities,
listen_port=responder_peer.context.listen_port,
)
# The handshake msgs sent by each peer (above) are going to be fed directly into their remote's
# reader, and thus the read_msg() calls will return immediately.
responder_hello, _ = await responder_peer.read_msg()
initiator_hello, _ = await initiator_peer.read_msg()
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()
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_peer = ParagonPeer(
transport=initiator_transport,
context=ParagonContext(),
)
initiator_peer.base_protocol.send_handshake(
client_version_string=initiator_peer.context.client_version_string,
capabilities=initiator_peer.capabilities,
listen_port=initiator_peer.context.listen_port,
)
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_peer = ParagonPeer(
transport=responder_transport,
context=ParagonContext(),
)
responder_peer.base_protocol.send_handshake(
client_version_string=responder_peer.context.client_version_string,
capabilities=responder_peer.capabilities,
listen_port=responder_peer.context.listen_port,
)
# The handshake msgs sent by each peer (above) are going to be fed directly into their remote's
# reader, and thus the read_msg() calls will return immediately.
responder_hello, _ = await responder_peer.read_msg()
initiator_hello, _ = await initiator_peer.read_msg()
assert isinstance(responder_hello, Hello)
assert isinstance(initiator_hello, Hello)
async def test_server_incoming_connection(server, receiver_remote):
use_eip8 = False
initiator = HandshakeInitiator(receiver_remote, INITIATOR_PRIVKEY,
use_eip8)
initiator_remote = NodeFactory(
pubkey=INITIATOR_PUBKEY,
address__ip='127.0.0.1',
)
for num_retries in range(10):
# The server isn't listening immediately so we give it a short grace
# period while trying to connect.
try:
reader, writer = await initiator.connect()
except ConnectionRefusedError:
await asyncio.sleep(0 + 0.001 * num_retries)
else:
break
else:
raise AssertionError("Unable to connect within 10 loops")
# Send auth init message to the server, then read and decode auth ack
aes_secret, mac_secret, egress_mac, ingress_mac = await _handshake(
initiator, reader, writer)
transport = Transport(
remote=receiver_remote,
private_key=initiator.privkey,
reader=reader,
writer=writer,
aes_secret=aes_secret,
mac_secret=mac_secret,
egress_mac=egress_mac,
ingress_mac=ingress_mac,
)
factory = ParagonPeerFactory(
initiator.privkey,
context=ParagonContext(),
)
handshakers = await factory.get_handshakers()
devp2p_handshake_params = DevP2PHandshakeParamsFactory(
listen_port=initiator_remote.address.tcp_port, )
multiplexer, devp2p_receipt, protocol_receipts = await negotiate_protocol_handshakes(
transport=transport,
p2p_handshake_params=devp2p_handshake_params,
protocol_handshakers=handshakers,
)
connection = Connection(
multiplexer=multiplexer,
devp2p_receipt=devp2p_receipt,
protocol_receipts=protocol_receipts,
is_dial_out=False,
)
initiator_peer = factory.create_peer(connection=connection)
# wait for peer to be processed
for _ in range(100):
if len(server.peer_pool) > 0:
break
await asyncio.sleep(0)
assert len(server.peer_pool.connected_nodes) == 1
receiver_peer = list(server.peer_pool.connected_nodes.values())[0]
assert isinstance(receiver_peer, ParagonPeer)
assert initiator_peer.sub_proto is not None
assert initiator_peer.sub_proto.name == receiver_peer.sub_proto.name
assert initiator_peer.sub_proto.version == receiver_peer.sub_proto.version
assert initiator_peer.remote.pubkey == RECEIVER_PRIVKEY.public_key
# Our connections are created manually and we don't call run() on them, so we need to stop the
# background streaming task or else we'll get asyncio warnings about task exceptions not being
# retrieved.
await initiator_peer.connection._multiplexer.stop_streaming()
await receiver_peer.connection._multiplexer.stop_streaming()
async def _receive_handshake(
self, reader: asyncio.StreamReader, writer: asyncio.StreamWriter) -> None:
msg = await self.wait(
reader.read(ENCRYPTED_AUTH_MSG_LEN),
timeout=REPLY_TIMEOUT)
peername = writer.get_extra_info("peername")
if peername is None:
socket = writer.get_extra_info("socket")
sockname = writer.get_extra_info("sockname")
raise HandshakeFailure(
"Received incoming connection with no remote information:"
f"socket={repr(socket)} sockname={sockname}"
)
ip, socket, *_ = peername
remote_address = Address(ip, socket)
self.logger.debug("Receiving handshake from %s", remote_address)
try:
ephem_pubkey, initiator_nonce, initiator_pubkey = decode_authentication(
msg, self.privkey)
except DecryptionError as non_eip8_err:
# Try to decode as EIP8
got_eip8 = True
msg_size = big_endian_to_int(msg[:2])
remaining_bytes = msg_size - ENCRYPTED_AUTH_MSG_LEN + 2
msg += await self.wait(
reader.read(remaining_bytes),
timeout=REPLY_TIMEOUT)
try:
ephem_pubkey, initiator_nonce, initiator_pubkey = decode_authentication(
msg, self.privkey)
except DecryptionError as eip8_err:
raise HandshakeFailure(
f"Failed to decrypt both EIP8 handshake: {eip8_err} and "
f"non-EIP8 handshake: {non_eip8_err}"
)
else:
got_eip8 = False
initiator_remote = Node(initiator_pubkey, remote_address)
responder = HandshakeResponder(initiator_remote, self.privkey, got_eip8, self.cancel_token)
responder_nonce = secrets.token_bytes(HASH_LEN)
auth_ack_msg = responder.create_auth_ack_message(responder_nonce)
auth_ack_ciphertext = responder.encrypt_auth_ack_message(auth_ack_msg)
# Use the `writer` to send the reply to the remote
writer.write(auth_ack_ciphertext)
await self.wait(writer.drain())
# Call `HandshakeResponder.derive_shared_secrets()` and use return values to create `Peer`
aes_secret, mac_secret, egress_mac, ingress_mac = responder.derive_secrets(
initiator_nonce=initiator_nonce,
responder_nonce=responder_nonce,
remote_ephemeral_pubkey=ephem_pubkey,
auth_init_ciphertext=msg,
auth_ack_ciphertext=auth_ack_ciphertext
)
transport = Transport(
remote=initiator_remote,
private_key=self.privkey,
reader=reader,
writer=writer,
aes_secret=aes_secret,
mac_secret=mac_secret,
egress_mac=egress_mac,
ingress_mac=ingress_mac,
)
# Create and register peer in peer_pool
peer = self.peer_pool.get_peer_factory().create_peer(
transport=transport,
inbound=True,
)
if self.peer_pool.is_full:
await peer.disconnect(DisconnectReason.too_many_peers)
return
elif not self.peer_pool.is_valid_connection_candidate(peer.remote):
await peer.disconnect(DisconnectReason.useless_peer)
return
total_peers = len(self.peer_pool)
inbound_peer_count = len([
peer
for peer
in self.peer_pool.connected_nodes.values()
if peer.inbound
])
if total_peers > 1 and inbound_peer_count / total_peers > DIAL_IN_OUT_RATIO:
# make sure to have at least 1/4 outbound connections
await peer.disconnect(DisconnectReason.too_many_peers)
else:
# We use self.wait() here as a workaround for
# https://github.com/ethereum/py-evm/issues/670.
await self.wait(self.do_handshake(peer))