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# Original work Copyright 2016 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Modified work Copyright 2020 Yubico AB. All Rights Reserved.
# This file, with modifications, is licensed under the above Apache License.
from __future__ import annotations
import fcntl
import logging
import os
import os.path
import select
import sys
from ctypes import Structure, c_char, c_int, c_uint8, c_uint16, c_uint32
from .base import FileCtapHidConnection, HidDescriptor
# Don't typecheck this file on Windows
assert sys.platform != "win32" # nosec
logger = logging.getLogger(__name__)
# /usr/include/dev/usb/usb.h
USB_GET_DEVICEINFO = 0x421C5570
USB_MAX_STRING_LEN = 127
USB_MAX_DEVNAMES = 4
USB_MAX_DEVNAMELEN = 16
FIDO_DEVS = "/dev/fido"
MAX_U2F_HIDLEN = 64
class UsbDeviceInfo(Structure):
_fields_ = [
("udi_bus", c_uint8),
("udi_addr", c_uint8),
("udi_product", c_char * USB_MAX_STRING_LEN),
("udi_vendor", c_char * USB_MAX_STRING_LEN),
("udi_release", c_char * 8),
("udi_productNo", c_uint16),
("udi_vendorNo", c_uint16),
("udi_releaseNo", c_uint16),
("udi_class", c_uint8),
("udi_subclass", c_uint8),
("udi_protocol", c_uint8),
("udi_config", c_uint8),
("udi_speed", c_uint8),
("udi_power", c_int),
("udi_nports", c_int),
("udi_devnames", c_char * USB_MAX_DEVNAMELEN * USB_MAX_DEVNAMES),
("udi_ports", c_uint32 * 16),
("udi_serial", c_char * USB_MAX_STRING_LEN),
]
class OpenBsdCtapHidConnection(FileCtapHidConnection):
def __init__(self, descriptor):
super().__init__(descriptor)
try:
self._terrible_ping_kludge()
except Exception:
self.close()
raise
def _terrible_ping_kludge(self):
# This is pulled from
# https://github.com/Yubico/libfido2/blob/da24193aa901086960f8d31b60d930ebef21f7a2/src/hid_openbsd.c#L128
for _ in range(4):
# 1 byte ping
data = b"\xff\xff\xff\xff\x81\0\1".ljust(
self.descriptor.report_size_out, b"\0"
)
poll = select.poll()
poll.register(self.handle, select.POLLIN)
self.write_packet(data)
poll.poll(100)
data = self.read_packet()
def open_connection(descriptor):
return OpenBsdCtapHidConnection(descriptor)
def get_descriptor(path):
f = os.open(path, os.O_RDONLY)
dev_info = UsbDeviceInfo()
try:
fcntl.ioctl(f, USB_GET_DEVICEINFO, dev_info) # type: ignore
finally:
os.close(f)
vid = int(dev_info.udi_vendorNo)
pid = int(dev_info.udi_productNo)
name = dev_info.udi_product.decode("utf-8") or None
serial = dev_info.udi_serial.decode("utf-8") or None
return HidDescriptor(path, vid, pid, MAX_U2F_HIDLEN, MAX_U2F_HIDLEN, name, serial)
# Cache for continuously failing devices
_failed_cache: set[str] = set()
def list_descriptors():
stale = set(_failed_cache)
descriptors = []
for dev in os.listdir(FIDO_DEVS):
path = os.path.join(FIDO_DEVS, dev)
stale.discard(path)
try:
descriptors.append(get_descriptor(path))
except Exception:
if path not in _failed_cache:
logger.debug("Failed opening FIDO device %s", path, exc_info=True)
_failed_cache.add(path)
return descriptors
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