# This file is part of the Trezor project. # # Copyright (C) 2012-2018 SatoshiLabs and contributors # # This library is free software: you can redistribute it and/or modify # it under the terms of the GNU Lesser General Public License version 3 # as published by the Free Software Foundation. # # This library is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Lesser General Public License for more details. # # You should have received a copy of the License along with this library. # If not, see . import logging import struct from io import BytesIO from typing import Any, Dict, Iterable, Optional import requests from . import Transport, TransportException from .. import mapping, protobuf if False: # mark Optional as used, otherwise it only exists in comments Optional LOG = logging.getLogger(__name__) TREZORD_HOST = "http://127.0.0.1:21325" TREZORD_ORIGIN_HEADER = {"Origin": "https://python.trezor.io"} TREZORD_VERSION_MODERN = (2, 0, 25) CONNECTION = requests.Session() CONNECTION.headers.update(TREZORD_ORIGIN_HEADER) def call_bridge(uri: str, data=None) -> requests.Response: url = TREZORD_HOST + "/" + uri r = CONNECTION.post(url, data=data) if r.status_code != 200: error_str = "trezord: {} failed with code {}: {}".format( uri, r.status_code, r.json()["error"] ) raise TransportException(error_str) return r def is_legacy_bridge() -> bool: config = call_bridge("configure").json() version_tuple = tuple(map(int, config["version"].split("."))) return version_tuple < TREZORD_VERSION_MODERN class BridgeHandle: def __init__(self, transport: "BridgeTransport") -> None: self.transport = transport def read_buf(self) -> bytes: raise NotImplementedError def write_buf(self, buf: bytes) -> None: raise NotImplementedError class BridgeHandleModern(BridgeHandle): def write_buf(self, buf: bytes) -> None: self.transport._call("post", data=buf.hex()) def read_buf(self) -> bytes: data = self.transport._call("read") return bytes.fromhex(data.text) class BridgeHandleLegacy(BridgeHandle): def __init__(self, transport: "BridgeTransport") -> None: super().__init__(transport) self.request = None # type: Optional[str] def write_buf(self, buf: bytes) -> None: if self.request is not None: raise TransportException("Can't write twice on legacy Bridge") self.request = buf.hex() def read_buf(self) -> bytes: if self.request is None: raise TransportException("Can't read without write on legacy Bridge") try: data = self.transport._call("call", data=self.request) return bytes.fromhex(data.text) finally: self.request = None class BridgeTransport(Transport): """ BridgeTransport implements transport through TREZOR Bridge (aka trezord). """ PATH_PREFIX = "bridge" def __init__( self, device: Dict[str, Any], legacy: bool, debug: bool = False ) -> None: if legacy and debug: raise TransportException("Debugging not supported on legacy Bridge") self.device = device self.session = None # type: Optional[str] self.debug = debug self.legacy = legacy if legacy: self.handle = BridgeHandleLegacy(self) # type: BridgeHandle else: self.handle = BridgeHandleModern(self) def get_path(self) -> str: return "%s:%s" % (self.PATH_PREFIX, self.device["path"]) def find_debug(self) -> "BridgeTransport": if not self.device.get("debug"): raise TransportException("Debug device not available") return BridgeTransport(self.device, self.legacy, debug=True) def _call(self, action: str, data: str = None) -> requests.Response: session = self.session or "null" uri = action + "/" + str(session) if self.debug: uri = "debug/" + uri return call_bridge(uri, data=data) @classmethod def enumerate(cls) -> Iterable["BridgeTransport"]: try: legacy = is_legacy_bridge() return [ BridgeTransport(dev, legacy) for dev in call_bridge("enumerate").json() ] except Exception: return [] def begin_session(self) -> None: data = self._call("acquire/" + self.device["path"]) self.session = data.json()["session"] def end_session(self) -> None: if not self.session: return self._call("release") self.session = None def write(self, msg: protobuf.MessageType) -> None: LOG.debug( "sending message: {}".format(msg.__class__.__name__), extra={"protobuf": msg}, ) buffer = BytesIO() protobuf.dump_message(buffer, msg) ser = buffer.getvalue() header = struct.pack(">HL", mapping.get_type(msg), len(ser)) self.handle.write_buf(header + ser) def read(self) -> protobuf.MessageType: data = self.handle.read_buf() headerlen = struct.calcsize(">HL") msg_type, datalen = struct.unpack(">HL", data[:headerlen]) buffer = BytesIO(data[headerlen : headerlen + datalen]) msg = protobuf.load_message(buffer, mapping.get_class(msg_type)) LOG.debug( "received message: {}".format(msg.__class__.__name__), extra={"protobuf": msg}, ) return msg TRANSPORT = BridgeTransport