94 lines
3.9 KiB
Python
94 lines
3.9 KiB
Python
from libp2p.crypto.keys import PublicKey
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from libp2p.crypto.pb import crypto_pb2
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from libp2p.crypto.utils import pubkey_from_protobuf
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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.secure_conn_interface import ISecureConn
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from libp2p.transport.exceptions import HandshakeFailure
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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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async def run_handshake(self) -> None:
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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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await self.write(encoded_msg_bytes)
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remote_msg_bytes = await read_fixedint_prefixed(self.conn)
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remote_msg = plaintext_pb2.Exchange()
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remote_msg.ParseFromString(remote_msg_bytes)
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# Verify if the given `pubkey` matches the given `peer_id`
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try:
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remote_pubkey = pubkey_from_protobuf(remote_msg.pubkey)
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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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remote_peer_id = ID(remote_msg.id)
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remote_peer_id_from_pubkey = ID.from_pubkey(remote_pubkey)
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if remote_peer_id_from_pubkey != remote_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"remote_peer_id={remote_peer_id}, remote_pubkey={remote_pubkey}, "
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f"remote_peer_id_from_pubkey={remote_peer_id_from_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 = remote_pubkey
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self.remote_peer_id = remote_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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"""
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``InsecureTransport`` provides the "identity" upgrader for a ``IRawConnection``,
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i.e. the upgraded transport does not add any additional security.
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"""
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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 node via conn,
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for an inbound connection (i.e. we are not 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(self, conn, ID(b""))
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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 node via conn,
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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(self, conn, peer_id)
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await session.run_handshake()
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received_peer_id = session.get_remote_peer()
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if session.remote_permanent_pubkey is not None and received_peer_id != peer_id:
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raise HandshakeFailure(
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"remote peer sent unexpected peer ID. "
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f"expected={peer_id} received={received_peer_id}"
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)
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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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