mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-12 10:39:00 +00:00
108 lines
3.7 KiB
Python
108 lines
3.7 KiB
Python
import os
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import logger
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import uhid
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def random_bytes(length):
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return os.urandom(length)
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class HIDInterface:
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uhid_device = "/dev/uhid"
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def __init__(self):
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self.file_descriptor = os.open(HIDInterface.uhid_device, os.O_RDWR)
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self.create_device()
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def __uhid_read(self, length):
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data = os.read(self.file_descriptor, length)
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logger.log_raw(f"{HIDInterface.uhid_device} >", data.hex())
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return data
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def __uhid_write(self, data):
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bytes_written = os.write(self.file_descriptor, data)
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assert bytes_written == len(data)
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logger.log_raw(f"{HIDInterface.uhid_device} <", data.hex())
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def create_device(self):
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name = b"Virtual Trezor"
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phys = b""
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uniq = random_bytes(64)
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bus = 0
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vendor = 0x1209
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product = 0x53C1
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version = 0x0200
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country = 0
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# fmt: off
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rd_data = bytes([
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0x06, 0xD0, 0xF1, # USAGE_PAGE (FIDO Alliance)
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0x09, 0x01, # USAGE (U2F HID Authenticator Device)
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0xA1, 0x01, # COLLECTION (Application)
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0x09, 0x20, # USAGE (Input Report Data)
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0x15, 0x00, # LOGICAL_MINIMUM (0)
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0x26, 0xFF, 0x00, # LOGICAL_MAXIMUM (255)
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0x75, 0x08, # REPORT_SIZE (8)
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0x95, 0x40, # REPORT_COUNT (64)
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0x81, 0x02, # INPUT (Data,Var,Abs)
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0x09, 0x21, # USAGE (Output Report Data)
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0x15, 0x00, # LOGICAL_MINIMUM (0)
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0x26, 0xFF, 0x00, # LOGICAL_MAXIMUM (255)
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0x75, 0x08, # REPORT_SIZE (8)
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0x95, 0x40, # REPORT_COUNT (64)
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0x91, 0x02, # OUTPUT (Data,Var,Abs)
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0xC0, # END_COLLECTION
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])
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# fmt: on
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buf = uhid.create_create2_event(
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name, phys, uniq, bus, vendor, product, version, country, rd_data
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)
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self.__uhid_write(buf)
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logger.log_uhid_event(
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"UHID_CREATE2",
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f"name='{name.decode()}' "
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f"phys='{phys.decode()}' "
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f"uniq=0x{uniq.hex()} "
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f"rd_size={len(rd_data)} "
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f"bus=0x{bus:04x} "
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f"vendor=0x{vendor:04x} "
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f"product=0x{product:04x} "
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f"version=0x{version:04x} "
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f"country=0x{country:04x} "
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f"rd_data=0x{rd_data.hex()}",
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)
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def write_data(self, data):
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buf = uhid.create_input2_event(data)
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self.__uhid_write(buf)
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logger.log_uhid_event(
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"UHID_INPUT2", f"data=0x{data.hex()} size={len(data)}"
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)
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logger.log_hid_packet("DEVICE_OUTPUT", f"0x{data.hex()}")
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def process_event(self):
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ev_type, request = uhid.parse_event(self.__uhid_read(uhid.EVENT_LENGTH))
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if ev_type == uhid.EVENT_TYPE_START:
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dev_flags, = request
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logger.log_uhid_event("UHID_START", f"dev_flags=0b{dev_flags:08b}")
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elif ev_type == uhid.EVENT_TYPE_STOP:
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logger.log_uhid_event("UHID_STOP")
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elif ev_type == uhid.EVENT_TYPE_OPEN:
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logger.log_uhid_event("UHID_OPEN")
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elif ev_type == uhid.EVENT_TYPE_CLOSE:
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logger.log_uhid_event("UHID_CLOSE")
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elif ev_type == uhid.EVENT_TYPE_OUTPUT:
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data, size, rtype = request
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logger.log_uhid_event(
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"UHID_OUTPUT",
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f"data=0x{data.hex()} size={size} rtype={rtype}",
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)
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logger.log_hid_packet("DEVICE_INPUT", f"0x{data[1:].hex()}")
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return data[1:]
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else:
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logger.log_uhid_event(
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"UNKNOWN_EVENT",
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f"ev_type={ev_type} request=0x{request.hex()}",
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)
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