def test_auth_header_preparation_without_enr(
tag, auth_tag, id_nonce, initiator_key, auth_response_key, ephemeral_public_key
):
message = PingMessage(request_id=5, enr_seq=1)
id_nonce_signature = b"\x00" * 32
packet = AuthHeaderPacket.prepare(
tag=tag,
auth_tag=auth_tag,
id_nonce=id_nonce,
message=message,
initiator_key=initiator_key,
id_nonce_signature=id_nonce_signature,
auth_response_key=auth_response_key,
enr=None,
ephemeral_public_key=ephemeral_public_key,
)
decrypted_auth_response = aesgcm_decrypt(
key=auth_response_key,
nonce=ZERO_NONCE,
cipher_text=packet.auth_header.encrypted_auth_response,
authenticated_data=b"",
)
decoded_auth_response = rlp.decode(decrypted_auth_response)
assert is_list_like(decoded_auth_response) and len(decoded_auth_response) == 3
assert decoded_auth_response[0] == int_to_big_endian(AUTH_RESPONSE_VERSION)
assert decoded_auth_response[1] == id_nonce_signature
assert decoded_auth_response[2] == []
def test_auth_tag_packet_preparation(tag, auth_tag, key):
message = PingMessage(request_id=5, enr_seq=3)
packet = AuthTagPacket.prepare(tag=tag, auth_tag=auth_tag, message=message, key=key)
assert packet.tag == tag
assert packet.auth_tag == auth_tag
decrypted_message = aesgcm_decrypt(
key=key,
nonce=auth_tag,
cipher_text=packet.encrypted_message,
authenticated_data=tag,
)
assert decrypted_message[0] == message.message_type
assert rlp.decode(decrypted_message[1:], PingMessage) == message
def test_auth_header_preparation(
tag, auth_tag, id_nonce, initiator_key, auth_response_key, ephemeral_public_key
):
enr = ENR(
sequence_number=1,
signature=b"",
kv_pairs={b"id": b"v4", b"secp256k1": b"\x02" * 33},
)
message = PingMessage(request_id=5, enr_seq=enr.sequence_number)
id_nonce_signature = b"\x00" * 32
packet = AuthHeaderPacket.prepare(
tag=tag,
auth_tag=auth_tag,
id_nonce=id_nonce,
message=message,
initiator_key=initiator_key,
id_nonce_signature=id_nonce_signature,
auth_response_key=auth_response_key,
enr=enr,
ephemeral_public_key=ephemeral_public_key,
)
assert packet.tag == tag
assert packet.auth_header.auth_tag == auth_tag
assert packet.auth_header.id_nonce == id_nonce
assert packet.auth_header.auth_scheme_name == AUTH_SCHEME_NAME
assert packet.auth_header.ephemeral_public_key == ephemeral_public_key
decrypted_auth_response = aesgcm_decrypt(
key=auth_response_key,
nonce=ZERO_NONCE,
cipher_text=packet.auth_header.encrypted_auth_response,
authenticated_data=b"",
)
decoded_auth_response = rlp.decode(decrypted_auth_response)
assert is_list_like(decoded_auth_response) and len(decoded_auth_response) == 3
assert decoded_auth_response[0] == int_to_big_endian(AUTH_RESPONSE_VERSION)
assert decoded_auth_response[1] == id_nonce_signature
assert ENR.deserialize(decoded_auth_response[2]) == enr
decrypted_message = aesgcm_decrypt(
key=initiator_key,
nonce=auth_tag,
cipher_text=packet.encrypted_message,
authenticated_data=tag,
)
assert decrypted_message[0] == message.message_type
assert rlp.decode(decrypted_message[1:], PingMessage) == message
async def ping(self, node_id: NodeID) -> None:
local_enr = self.get_local_enr()
ping = PingMessage(
request_id=self.message_dispatcher.get_free_request_id(node_id),
enr_seq=local_enr.sequence_number,
)
try:
with trio.fail_after(REQUEST_RESPONSE_TIMEOUT):
inbound_message = await self.message_dispatcher.request(node_id, ping)
except ValueError as value_error:
self.logger.debug(
"Failed to send ping to %s: %s", encode_hex(node_id), value_error
)
except trio.TooSlowError:
self.logger.debug("Ping to %s timed out", encode_hex(node_id))
else:
if not isinstance(inbound_message.message, PongMessage):
self.logger.debug(
"Peer %s responded to Ping with %s instead of Pong",
encode_hex(node_id),
inbound_message.message.__class__.__name__,
)
else:
self.logger.debug("Received Pong from %s", encode_hex(node_id))
self.update_routing_table(node_id)
pong = inbound_message.message
local_endpoint = Endpoint(
ip_address=pong.packet_ip, port=pong.packet_port
)
endpoint_vote = EndpointVote(
endpoint=local_endpoint, node_id=node_id, timestamp=time.monotonic()
)
await self.endpoint_vote_send_channel.send(endpoint_vote)
await self.maybe_request_remote_enr(inbound_message)
def message(enr):
return PingMessage(request_id=5, enr_seq=enr.sequence_number)
def test_message_encoding():
message = PingMessage(request_id=5, enr_seq=10)
encoded_message = message.to_bytes()
assert encoded_message[0] == message.message_type
assert encoded_message[1:] == rlp.encode(message)