141 lines
5.5 KiB
Python
141 lines
5.5 KiB
Python
from typing import Optional
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from libp2p.crypto.exceptions import MissingDeserializerError
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from libp2p.crypto.keys import PrivateKey, PublicKey
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from libp2p.crypto.pb import crypto_pb2
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from libp2p.crypto.serialization import deserialize_public_key
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from libp2p.io.abc import ReadWriteCloser
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from libp2p.network.connection.exceptions import RawConnError
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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.base_session import BaseSession
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from libp2p.security.base_transport import BaseSecureTransport
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from libp2p.security.exceptions import HandshakeFailure
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from libp2p.security.secure_conn_interface import ISecureConn
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from libp2p.typing import TProtocol
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from libp2p.utils import encode_fixedint_prefixed, read_fixedint_prefixed
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from .pb import plaintext_pb2
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# Reference: https://github.com/libp2p/go-libp2p-core/blob/master/sec/insecure/insecure.go
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PLAINTEXT_PROTOCOL_ID = TProtocol("/plaintext/2.0.0")
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class InsecureSession(BaseSession):
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def __init__(
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self,
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local_peer: ID,
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local_private_key: PrivateKey,
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conn: ReadWriteCloser,
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is_initiator: bool,
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peer_id: Optional[ID] = None,
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) -> None:
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super().__init__(local_peer, local_private_key, is_initiator, peer_id)
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self.conn = conn
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async def write(self, data: bytes) -> int:
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await self.conn.write(data)
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return len(data)
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async def read(self, n: int = None) -> bytes:
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return await self.conn.read(n)
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async def close(self) -> None:
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await self.conn.close()
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async def run_handshake(self) -> None:
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"""Raise `HandshakeFailure` when handshake failed."""
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msg = make_exchange_message(self.local_private_key.get_public_key())
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msg_bytes = msg.SerializeToString()
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encoded_msg_bytes = encode_fixedint_prefixed(msg_bytes)
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try:
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await self.write(encoded_msg_bytes)
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except RawConnError:
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raise HandshakeFailure("connection closed")
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try:
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remote_msg_bytes = await read_fixedint_prefixed(self.conn)
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except RawConnError:
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raise HandshakeFailure("connection closed")
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remote_msg = plaintext_pb2.Exchange()
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remote_msg.ParseFromString(remote_msg_bytes)
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received_peer_id = ID(remote_msg.id)
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# Verify if the receive `ID` matches the one we originally initialize the session.
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# We only need to check it when we are the initiator, because only in that condition
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# we possibly knows the `ID` of the remote.
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if self.is_initiator and self.remote_peer_id != received_peer_id:
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raise HandshakeFailure(
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"remote peer sent unexpected peer ID. "
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f"expected={self.remote_peer_id} received={received_peer_id}"
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)
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# Verify if the given `pubkey` matches the given `peer_id`
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try:
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received_pubkey = deserialize_public_key(
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remote_msg.pubkey.SerializeToString()
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)
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except ValueError:
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raise HandshakeFailure(
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f"unknown `key_type` of remote_msg.pubkey={remote_msg.pubkey}"
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)
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except MissingDeserializerError as error:
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raise HandshakeFailure(error)
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peer_id_from_received_pubkey = ID.from_pubkey(received_pubkey)
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if peer_id_from_received_pubkey != received_peer_id:
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raise HandshakeFailure(
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"peer id and pubkey from the remote mismatch: "
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f"received_peer_id={received_peer_id}, remote_pubkey={received_pubkey}, "
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f"peer_id_from_received_pubkey={peer_id_from_received_pubkey}"
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)
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# Nothing is wrong. Store the `pubkey` and `peer_id` in the session.
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self.remote_permanent_pubkey = received_pubkey
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# Only need to set peer's id when we don't know it before,
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# i.e. we are not the connection initiator.
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if not self.is_initiator:
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self.remote_peer_id = received_peer_id
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# TODO: Store `pubkey` and `peer_id` to `PeerStore`
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class InsecureTransport(BaseSecureTransport):
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"""``InsecureTransport`` provides the "identity" upgrader for a
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``IRawConnection``, i.e. the upgraded transport does not add any additional
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security."""
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async def secure_inbound(self, conn: IRawConnection) -> ISecureConn:
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"""
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Secure the connection, either locally or by communicating with opposing
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node via conn, for an inbound connection (i.e. we are not the
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initiator)
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:return: secure connection object (that implements secure_conn_interface)
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"""
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session = InsecureSession(self.local_peer, self.local_private_key, conn, False)
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await session.run_handshake()
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return session
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async def secure_outbound(self, conn: IRawConnection, peer_id: ID) -> ISecureConn:
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"""
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Secure the connection, either locally or by communicating with opposing
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node via conn, for an inbound connection (i.e. we are the initiator)
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:return: secure connection object (that implements secure_conn_interface)
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"""
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session = InsecureSession(
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self.local_peer, self.local_private_key, conn, True, peer_id
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)
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await session.run_handshake()
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return session
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def make_exchange_message(pubkey: PublicKey) -> plaintext_pb2.Exchange:
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pubkey_pb = crypto_pb2.PublicKey(
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key_type=pubkey.get_type().value, data=pubkey.to_bytes()
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)
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id_bytes = ID.from_pubkey(pubkey).to_bytes()
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return plaintext_pb2.Exchange(id=id_bytes, pubkey=pubkey_pb)
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