184 lines
7.1 KiB
Python
184 lines
7.1 KiB
Python
from abc import ABC, abstractmethod
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from noise.backends.default.keypairs import KeyPair as NoiseKeyPair
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from noise.connection import Keypair as NoiseKeypairEnum
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from noise.connection import NoiseConnection as NoiseState
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from libp2p.crypto.ed25519 import Ed25519PublicKey
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from libp2p.crypto.keys import PrivateKey, PublicKey
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from libp2p.network.connection.raw_connection_interface import IRawConnection
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from libp2p.peer.id import ID
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from libp2p.security.secure_conn_interface import ISecureConn
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from libp2p.security.secure_session import SecureSession
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from .exceptions import (
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HandshakeHasNotFinished,
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InvalidSignature,
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NoiseStateError,
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PeerIDMismatchesPubkey,
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)
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from .io import NoiseHandshakeReadWriter, NoiseTransportReadWriter
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from .messages import (
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NoiseHandshakePayload,
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make_handshake_payload_sig,
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verify_handshake_payload_sig,
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)
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class IPattern(ABC):
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@abstractmethod
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async def handshake_inbound(self, conn: IRawConnection) -> ISecureConn:
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...
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@abstractmethod
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async def handshake_outbound(
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self, conn: IRawConnection, remote_peer: ID
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) -> ISecureConn:
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...
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class BasePattern(IPattern):
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protocol_name: bytes
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noise_static_key: PrivateKey
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local_peer: ID
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libp2p_privkey: PrivateKey
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early_data: bytes
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def create_noise_state(self) -> NoiseState:
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noise_state = NoiseState.from_name(self.protocol_name)
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noise_state.set_keypair_from_private_bytes(
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NoiseKeypairEnum.STATIC, self.noise_static_key.to_bytes()
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)
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return noise_state
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def make_handshake_payload(self) -> NoiseHandshakePayload:
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signature = make_handshake_payload_sig(
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self.libp2p_privkey, self.noise_static_key.get_public_key()
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)
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return NoiseHandshakePayload(self.libp2p_privkey.get_public_key(), signature)
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class PatternXX(BasePattern):
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def __init__(
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self,
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local_peer: ID,
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libp2p_privkey: PrivateKey,
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noise_static_key: PrivateKey,
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early_data: bytes = None,
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) -> None:
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self.protocol_name = b"Noise_XX_25519_ChaChaPoly_SHA256"
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self.local_peer = local_peer
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self.libp2p_privkey = libp2p_privkey
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self.noise_static_key = noise_static_key
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self.early_data = early_data
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async def handshake_inbound(self, conn: IRawConnection) -> ISecureConn:
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noise_state = self.create_noise_state()
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noise_state.set_as_responder()
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noise_state.start_handshake()
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handshake_state = noise_state.noise_protocol.handshake_state
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read_writer = NoiseHandshakeReadWriter(conn, noise_state)
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# Consume msg#1.
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await read_writer.read_msg()
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# Send msg#2, which should include our handshake payload.
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our_payload = self.make_handshake_payload()
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msg_2 = our_payload.serialize()
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await read_writer.write_msg(msg_2)
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# Receive and consume msg#3.
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msg_3 = await read_writer.read_msg()
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peer_handshake_payload = NoiseHandshakePayload.deserialize(msg_3)
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if handshake_state.rs is None:
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raise NoiseStateError(
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"something is wrong in the underlying noise `handshake_state`: "
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"we received and consumed msg#3, which should have included the"
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" remote static public key, but it is not present in the handshake_state"
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)
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remote_pubkey = self._get_pubkey_from_noise_keypair(handshake_state.rs)
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if not verify_handshake_payload_sig(peer_handshake_payload, remote_pubkey):
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raise InvalidSignature
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remote_peer_id_from_pubkey = ID.from_pubkey(peer_handshake_payload.id_pubkey)
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if not noise_state.handshake_finished:
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raise HandshakeHasNotFinished(
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"handshake is done but it is not marked as finished in `noise_state`"
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)
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transport_read_writer = NoiseTransportReadWriter(conn, noise_state)
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return SecureSession(
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local_peer=self.local_peer,
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local_private_key=self.libp2p_privkey,
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remote_peer=remote_peer_id_from_pubkey,
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remote_permanent_pubkey=remote_pubkey,
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is_initiator=False,
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conn=transport_read_writer,
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)
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async def handshake_outbound(
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self, conn: IRawConnection, remote_peer: ID
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) -> ISecureConn:
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noise_state = self.create_noise_state()
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read_writer = NoiseHandshakeReadWriter(conn, noise_state)
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noise_state.set_as_initiator()
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noise_state.start_handshake()
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handshake_state = noise_state.noise_protocol.handshake_state
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# Send msg#1, which is *not* encrypted.
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msg_1 = b""
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await read_writer.write_msg(msg_1)
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# Read msg#2 from the remote, which contains the public key of the peer.
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msg_2 = await read_writer.read_msg()
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peer_handshake_payload = NoiseHandshakePayload.deserialize(msg_2)
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if handshake_state.rs is None:
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raise NoiseStateError(
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"something is wrong in the underlying noise `handshake_state`: "
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"we received and consumed msg#3, which should have included the"
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" remote static public key, but it is not present in the handshake_state"
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)
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remote_pubkey = self._get_pubkey_from_noise_keypair(handshake_state.rs)
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if not verify_handshake_payload_sig(peer_handshake_payload, remote_pubkey):
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raise InvalidSignature
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remote_peer_id_from_pubkey = ID.from_pubkey(peer_handshake_payload.id_pubkey)
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if remote_peer_id_from_pubkey != remote_peer:
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raise PeerIDMismatchesPubkey(
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"peer id does not correspond to the received pubkey: "
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f"remote_peer={remote_peer}, "
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f"remote_peer_id_from_pubkey={remote_peer_id_from_pubkey}"
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)
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# Send msg#3, which includes our encrypted payload and our noise static key.
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our_payload = self.make_handshake_payload()
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msg_3 = our_payload.serialize()
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await read_writer.write_msg(msg_3)
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if not noise_state.handshake_finished:
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raise HandshakeHasNotFinished(
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"handshake is done but it is not marked as finished in `noise_state`"
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)
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transport_read_writer = NoiseTransportReadWriter(conn, noise_state)
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return SecureSession(
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local_peer=self.local_peer,
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local_private_key=self.libp2p_privkey,
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remote_peer=remote_peer_id_from_pubkey,
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remote_permanent_pubkey=remote_pubkey,
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is_initiator=True,
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conn=transport_read_writer,
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)
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@staticmethod
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def _get_pubkey_from_noise_keypair(key_pair: NoiseKeyPair) -> PublicKey:
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# Use `Ed25519PublicKey` since 25519 is used in our pattern.
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# NOTE: Ignore the warning for now, since it is also not fixed in `noiseprotocol`.
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# "CryptographyDeprecationWarning: public_bytes now requires
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# encoding and format arguments. Support for calling without arguments will be
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# removed in cryptography 2.7"
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raw_bytes = key_pair.public.public_bytes()
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return Ed25519PublicKey.from_bytes(raw_bytes)
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