mirror of
https://github.com/trezor/trezor-firmware.git
synced 2025-02-05 04:10:58 +00:00
250 lines
7.2 KiB
Python
250 lines
7.2 KiB
Python
import hashlib
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import os
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import typing as t
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import pytest
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import typing_extensions as tx
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from trezorlib import protobuf
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from trezorlib.client import ProtocolV2
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from trezorlib.debuglink import TrezorClientDebugLink as Client
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from trezorlib.messages import (
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ButtonAck,
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ButtonRequest,
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ThpCodeEntryChallenge,
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ThpCodeEntryCommitment,
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ThpCodeEntryCpaceHostTag,
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ThpCodeEntryCpaceTrezor,
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ThpCodeEntrySecret,
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ThpEndRequest,
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ThpEndResponse,
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ThpPairingMethod,
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ThpPairingPreparationsFinished,
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ThpPairingRequest,
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ThpPairingRequestApproved,
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ThpQrCodeSecret,
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ThpQrCodeTag,
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ThpSelectMethod,
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)
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from trezorlib.transport.thp import curve25519
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from trezorlib.transport.thp.protocol_v2 import MANAGEMENT_SESSION_ID, _hkdf
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if t.TYPE_CHECKING:
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P = tx.ParamSpec("P")
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MT = t.TypeVar("MT", bound=protobuf.MessageType)
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pytestmark = [pytest.mark.protocol("protocol_v2")]
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protocol: ProtocolV2
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def _prepare_protocol(client: Client):
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global protocol
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protocol = client.protocol
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protocol.sync_bit_send = 0
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protocol.sync_bit_receive = 0
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def test_allocate_channel(client: Client) -> None:
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global protocol
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_prepare_protocol(client)
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# protocol: ProtocolV2 = client.protocol
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nonce = b"\x1A\x2B\x3B\x4A\x5C\x6D\x7E\x8F"
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# Use valid nonce
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protocol._send_channel_allocation_request(nonce)
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protocol._read_channel_allocation_response(nonce)
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# Expect different nonce
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protocol._send_channel_allocation_request(nonce)
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with pytest.raises(Exception, match="Invalid channel allocation response."):
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protocol._read_channel_allocation_response(
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expected_nonce=b"\xDE\xAD\xBE\xEF\xDE\xAD\xBE\xEF"
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)
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client.invalidate()
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def test_handshake(client: Client) -> None:
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global protocol
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_prepare_protocol(client)
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# protocol: ProtocolV2 = client.protocol
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host_ephemeral_privkey = curve25519.get_private_key(os.urandom(32))
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host_ephemeral_pubkey = curve25519.get_public_key(host_ephemeral_privkey)
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protocol._do_channel_allocation()
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protocol._send_handshake_init_request(host_ephemeral_pubkey)
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protocol._read_ack()
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init_response = protocol._read_handshake_init_response()
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trezor_ephemeral_pubkey = init_response[:32]
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encrypted_trezor_static_pubkey = init_response[32:80]
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noise_tag = init_response[80:96]
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# TODO check noise_tag is valid
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ck = protocol._send_handshake_completion_request(
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host_ephemeral_pubkey,
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host_ephemeral_privkey,
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trezor_ephemeral_pubkey,
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encrypted_trezor_static_pubkey,
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)
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protocol._read_ack()
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protocol._read_handshake_completion_response()
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protocol.key_request, protocol.key_response = _hkdf(ck, b"")
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protocol.nonce_request = 0
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protocol.nonce_response = 1
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# TODO - without pairing, the client is damaged and results in fail of the following test
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# so far no luck in solving it - it should be also tackled in FW, as it causes unexpected FW error
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protocol._do_pairing(client.debug)
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# TODO the following is just to make style checker happy
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assert noise_tag is not None
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def _send_message(
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message: MT,
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session_id: int = MANAGEMENT_SESSION_ID,
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):
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global protocol
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message_type, message_data = protocol.mapping.encode(message)
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protocol._encrypt_and_write(session_id, message_type, message_data)
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protocol._read_ack()
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def _read_message(message_type: type[MT]) -> MT:
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global protocol
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_, msg_type, msg_data = protocol.read_and_decrypt()
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msg = protocol.mapping.decode(msg_type, msg_data)
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assert isinstance(msg, message_type)
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return msg
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def test_pairing_qr_code(client: Client) -> None:
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global protocol
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_prepare_protocol(client)
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# Generate ephemeral keys
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host_ephemeral_privkey = curve25519.get_private_key(os.urandom(32))
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host_ephemeral_pubkey = curve25519.get_public_key(host_ephemeral_privkey)
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protocol._do_channel_allocation()
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protocol._do_handshake(host_ephemeral_privkey, host_ephemeral_pubkey)
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_send_message(ThpPairingRequest())
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_read_message(ButtonRequest)
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_send_message(ButtonAck())
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client.debug.press_yes()
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_read_message(ThpPairingRequestApproved)
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_send_message(ThpSelectMethod(selected_pairing_method=ThpPairingMethod.QrCode))
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_read_message(ThpPairingPreparationsFinished)
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# QR Code shown
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_read_message(ButtonRequest)
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_send_message(ButtonAck())
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# Read code from "Trezor's display" using debuglink
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state = client.debug.state(thp_channel_id=protocol.channel_id.to_bytes(2, "big"))
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code = state.thp_pairing_code_qr_code
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# Compute tag for response
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sha_ctx = hashlib.sha256(protocol.handshake_hash)
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sha_ctx.update(state.thp_pairing_code_qr_code)
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tag = sha_ctx.digest()
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_send_message(ThpQrCodeTag(tag=tag))
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secret_msg = _read_message(ThpQrCodeSecret)
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# Check that the `code` was derived from the revealed secret
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sha_ctx = hashlib.sha256(ThpPairingMethod.QrCode.to_bytes(1, "big"))
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sha_ctx.update(protocol.handshake_hash)
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sha_ctx.update(secret_msg.secret)
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computed_code = sha_ctx.digest()[:16]
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assert code == computed_code
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_send_message(ThpEndRequest())
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_read_message(ThpEndResponse)
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protocol._has_valid_channel = True
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@pytest.mark.skip("Cpace is not implemented yet")
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def test_pairing_code_entry(client: Client) -> None:
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global protocol
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_prepare_protocol(client)
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# Generate ephemeral keys
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host_ephemeral_privkey = curve25519.get_private_key(os.urandom(32))
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host_ephemeral_pubkey = curve25519.get_public_key(host_ephemeral_privkey)
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protocol._do_channel_allocation()
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protocol._do_handshake(host_ephemeral_privkey, host_ephemeral_pubkey)
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_send_message(ThpPairingRequest())
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_read_message(ButtonRequest)
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_send_message(ButtonAck())
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client.debug.press_yes()
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_read_message(ThpPairingRequestApproved)
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_send_message(ThpSelectMethod(selected_pairing_method=ThpPairingMethod.CodeEntry))
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commitment_msg = _read_message(ThpCodeEntryCommitment)
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commitment = commitment_msg.commitment
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challenge = b"\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xAA\xBB\xCC\xDD\xEE\xFF"
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_send_message(ThpCodeEntryChallenge(challenge=challenge))
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cpace_trezor = _read_message(ThpCodeEntryCpaceTrezor)
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cpace_trezor_public_key = cpace_trezor.cpace_trezor_public_key
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# Code Entry code shown
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_read_message(ButtonRequest)
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_send_message(ButtonAck())
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state = client.debug.state(thp_channel_id=protocol.channel_id.to_bytes(2, "big"))
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code = state.thp_pairing_code_entry_code
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# TODO fix missing CPACE
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cpace_shared_secret = b"\x01"
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sha_ctx = hashlib.sha256(cpace_shared_secret)
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tag = sha_ctx.digest()
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cpace_host_public_key = cpace_trezor_public_key
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_send_message(
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ThpCodeEntryCpaceHostTag(
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cpace_host_public_key=cpace_host_public_key,
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tag=tag,
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)
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)
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secret_msg = _read_message(ThpCodeEntrySecret)
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# Check `commitment` and `code`
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sha_ctx = hashlib.sha256(secret_msg.secret)
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computed_commitment = sha_ctx.digest()
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assert commitment == computed_commitment
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assert code == b"" # TODO implement
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_send_message(ThpEndRequest())
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_read_message(ThpEndResponse)
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protocol._has_valid_channel = True
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