117 lines
3.8 KiB
Python
117 lines
3.8 KiB
Python
from abc import ABC, abstractmethod
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from noise.connection import Keypair as NoiseKeypair
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from noise.connection import NoiseConnection as NoiseState
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from libp2p.crypto.keys import PrivateKey
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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 .connection import NoiseConnection
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# FIXME: Choose a serious bound number.
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NUM_BYTES_TO_READ = 2048
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# TODO: Merged into `BasePattern`?
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class PreHandshakeConnection:
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conn: IRawConnection
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def __init__(self, conn: IRawConnection) -> None:
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self.conn = conn
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async def write_msg(self, data: bytes) -> None:
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# TODO:
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await self.conn.write(data)
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async def read_msg(self) -> bytes:
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return await self.conn.read(NUM_BYTES_TO_READ)
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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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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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NoiseKeypair.STATIC, self.noise_static_key.to_bytes()
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)
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return noise_state
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class PatternXX(BasePattern):
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def __init__(
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self, local_peer: ID, libp2p_privkey: PrivateKey, noise_static_key: PrivateKey
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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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async def handshake_inbound(self, conn: IRawConnection) -> ISecureConn:
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noise_state = self.create_noise_state()
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handshake_conn = PreHandshakeConnection(conn)
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noise_state.set_as_responder()
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noise_state.start_handshake()
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msg_0_encrypted = await handshake_conn.read_msg()
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# TODO: Parse and save the payload from the other side.
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_ = noise_state.read_message(msg_0_encrypted)
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# TODO: Send our payload.
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our_payload = b"server"
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msg_1_encrypted = noise_state.write_message(our_payload)
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await handshake_conn.write_msg(msg_1_encrypted)
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msg_2_encrypted = await handshake_conn.read_msg()
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# TODO: Parse and save another payload from the other side.
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_ = noise_state.read_message(msg_2_encrypted)
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# TODO: Add a specific exception
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if not noise_state.handshake_finished:
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raise Exception
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# FIXME: `remote_peer` should be derived from the messages.
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return NoiseConnection(self.local_peer, self.libp2p_privkey, None, conn, False)
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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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handshake_conn = PreHandshakeConnection(conn)
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noise_state.set_as_initiator()
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noise_state.start_handshake()
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msg_0 = noise_state.write_message()
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await handshake_conn.write_msg(msg_0)
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msg_1_encrypted = await handshake_conn.read_msg()
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# TODO: Parse and save the payload from the other side.
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_ = noise_state.read_message(msg_1_encrypted)
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# TODO: Send our payload.
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our_payload = b"client"
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msg_2_encrypted = noise_state.write_message(our_payload)
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await handshake_conn.write_msg(msg_2_encrypted)
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# TODO: Add a specific exception
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if not noise_state.handshake_finished:
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raise Exception
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return NoiseConnection(
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self.local_peer, self.libp2p_privkey, remote_peer, conn, False
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)
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