mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-24 23:38:09 +00:00
162 lines
5.1 KiB
Python
162 lines
5.1 KiB
Python
# This file is part of the Trezor project.
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#
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# Copyright (C) 2012-2018 SatoshiLabs and contributors
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#
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# This library is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License version 3
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# as published by the Free Software Foundation.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the License along with this library.
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# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
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import logging
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import sys
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import time
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from typing import Any, Dict, Iterable
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from . import DEV_TREZOR1, UDEV_RULES_STR, TransportException
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from .protocol import ProtocolBasedTransport, ProtocolV1
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LOG = logging.getLogger(__name__)
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try:
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import hid
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except Exception as e:
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LOG.info("HID transport is disabled: {}".format(e))
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hid = None
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HidDevice = Dict[str, Any]
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HidDeviceHandle = Any
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class HidHandle:
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def __init__(
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self, path: bytes, serial: str, probe_hid_version: bool = False
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) -> None:
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self.path = path
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self.serial = serial
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self.handle = None # type: HidDeviceHandle
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self.hid_version = None if probe_hid_version else 2
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def open(self) -> None:
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self.handle = hid.device()
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try:
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self.handle.open_path(self.path)
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except (IOError, OSError) as e:
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if sys.platform.startswith("linux"):
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e.args = e.args + (UDEV_RULES_STR,)
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raise e
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# On some platforms, HID path stays the same over device reconnects.
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# That means that someone could unplug a Trezor, plug a different one
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# and we wouldn't even know.
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# So we check that the serial matches what we expect.
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serial = self.handle.get_serial_number_string()
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if serial != self.serial:
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self.handle.close()
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self.handle = None
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raise TransportException(
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"Unexpected device {} on path {}".format(serial, self.path.decode())
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)
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self.handle.set_nonblocking(True)
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if self.hid_version is None:
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self.hid_version = self.probe_hid_version()
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def close(self) -> None:
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if self.handle is not None:
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# reload serial, because device.wipe() can reset it
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self.serial = self.handle.get_serial_number_string()
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self.handle.close()
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self.handle = None
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def write_chunk(self, chunk: bytes) -> None:
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if len(chunk) != 64:
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raise TransportException("Unexpected chunk size: %d" % len(chunk))
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if self.hid_version == 2:
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self.handle.write(b"\0" + bytearray(chunk))
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else:
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self.handle.write(chunk)
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def read_chunk(self) -> bytes:
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while True:
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chunk = self.handle.read(64)
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if chunk:
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break
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else:
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time.sleep(0.001)
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if len(chunk) != 64:
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raise TransportException("Unexpected chunk size: %d" % len(chunk))
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return bytes(chunk)
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def probe_hid_version(self) -> int:
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n = self.handle.write([0, 63] + [0xFF] * 63)
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if n == 65:
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return 2
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n = self.handle.write([63] + [0xFF] * 63)
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if n == 64:
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return 1
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raise TransportException("Unknown HID version")
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class HidTransport(ProtocolBasedTransport):
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"""
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HidTransport implements transport over USB HID interface.
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"""
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PATH_PREFIX = "hid"
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ENABLED = hid is not None
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def __init__(self, device: HidDevice) -> None:
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self.device = device
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self.handle = HidHandle(device["path"], device["serial_number"])
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protocol = ProtocolV1(self.handle)
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super().__init__(protocol=protocol)
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def get_path(self) -> str:
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return "%s:%s" % (self.PATH_PREFIX, self.device["path"].decode())
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@classmethod
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def enumerate(cls, debug: bool = False) -> Iterable["HidTransport"]:
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devices = []
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for dev in hid.enumerate(0, 0):
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usb_id = (dev["vendor_id"], dev["product_id"])
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if usb_id != DEV_TREZOR1:
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continue
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if debug:
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if not is_debuglink(dev):
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continue
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else:
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if not is_wirelink(dev):
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continue
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devices.append(HidTransport(dev))
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return devices
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def find_debug(self) -> "HidTransport":
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if self.protocol.VERSION >= 2:
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# use the same device
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return self
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else:
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# For v1 protocol, find debug USB interface for the same serial number
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for debug in HidTransport.enumerate(debug=True):
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if debug.device["serial_number"] == self.device["serial_number"]:
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return debug
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raise TransportException("Debug HID device not found")
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def is_wirelink(dev: HidDevice) -> bool:
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return dev["usage_page"] == 0xFF00 or dev["interface_number"] == 0
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def is_debuglink(dev: HidDevice) -> bool:
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return dev["usage_page"] == 0xFF01 or dev["interface_number"] == 1
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