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#!/usr/bin/env python3
import time
import string
import enum
from cobs import cobs
def _print_line(write, ts, line, width=16):
h,m,s,ms = int(ts//3600), int((ts//60)%60), int(ts%60), int((ts%1.0) * 1000)
timestamp = f'{h: 3d}:{m:02d}:{s:02d}:{ms:03d}'
line = list(line) + [None]*(width-len(line))
hexcol = '\033[0m'
col = lambda b, s: s if b != 0 else f'\033[91m{s}{hexcol}'
hexfmt = ' '.join(
' '.join(col(b, f'{b:02x}') if b is not None else ' ' for b in line[i*8:i*8+8])
for i in range(1 + (len(line)-1)//8))
asciifmt = ''.join(chr(c) if c is not None and chr(c) in string.printable and c>=0x20 else '.' for c in line)
write(f'\033[38;5;244m{timestamp} {hexcol}{hexfmt} \033[38;5;244m|\033[92m{asciifmt}\033[38;5;244m|\033[0m', flush=True, end='')
startup = time.time()
def hexdump(write, packet, width=16):
ts = time.time()
while len(packet) > width:
chunk, packet = packet[:width], packet[width:]
_print_line(write, ts-startup, chunk, width=width)
write()
_print_line(write, ts-startup, packet, width=width)
write()
class PacketType(enum.Enum):
_RESERVED = 0
INITIATE_HANDSHAKE = 1
HANDSHAKE = 2
DATA = 3
class ReportType(enum.Enum):
_RESERVED = 0
KEYBOARD = 1
MOUSE = 2
PAIRING = 3 # keyboard in disguise
def send_packet(ser, pkt_type, data, width=16):
print(f'\033[93mSending {len(data)} bytes, packet type {pkt_type.name} ({pkt_type.value})\033[0m')
hexdump(print, data, width)
data = bytes([pkt_type.value]) + data
encoded = cobs.encode(data) + b'\0'
ser.write(encoded)
ser.flushOutput()
def receive_packet(ser, width=16):
packet = ser.read_until(b'\0')
data = cobs.decode(packet[:-1])
print(f'\033[93mReceived {len(data)} bytes\033[0m')
hexdump(print, data, width)
return data[0], data[1:]
if __name__ == '__main__':
import argparse
import serial
parser = argparse.ArgumentParser()
parser.add_argument('serial')
parser.add_argument('baudrate')
parser.add_argument('-w', '--width', type=int, default=16, help='Number of bytes to display in one line')
args = parser.parse_args()
ser = serial.Serial(args.serial, args.baudrate)
import uinput
ALL_KEYS = [ v for k, v in uinput.ev.__dict__.items() if k.startswith('KEY_') ]
MODIFIERS = [
uinput.ev.KEY_LEFTCTRL,
uinput.ev.KEY_LEFTSHIFT,
uinput.ev.KEY_LEFTALT,
uinput.ev.KEY_LEFTMETA,
uinput.ev.KEY_RIGHTCTRL,
uinput.ev.KEY_RIGHTSHIFT,
uinput.ev.KEY_RIGHTALT,
uinput.ev.KEY_RIGHTMETA,
]
map_modifiers = lambda x: [ mod for i, mod in enumerate(MODIFIERS) if x & (1<<i) ]
import keymap
map_regular = { v: getattr(uinput.ev, k) for k, v in keymap.__dict__.items() if k.startswith('KEY_') }
map_regulars = lambda keycodes: [ map_regular[kc] for kc in keycodes if kc != 0 and kc in map_regular ]
from noise.connection import NoiseConnection, Keypair
from noise.exceptions import NoiseInvalidMessage
STATIC_LOCAL = bytes([
0xbb, 0xdb, 0x4c, 0xdb, 0xd3, 0x09, 0xf1, 0xa1,
0xf2, 0xe1, 0x45, 0x69, 0x67, 0xfe, 0x28, 0x8c,
0xad, 0xd6, 0xf7, 0x12, 0xd6, 0x5d, 0xc7, 0xb7,
0x79, 0x3d, 0x5e, 0x63, 0xda, 0x6b, 0x37, 0x5b
])
proto = NoiseConnection.from_name(b'Noise_XX_25519_ChaChaPoly_BLAKE2s')
proto.set_as_initiator()
proto.set_keypair_from_private_bytes(Keypair.STATIC, STATIC_LOCAL)
proto.start_handshake()
send_packet(ser, PacketType.INITIATE_HANDSHAKE, b'', args.width)
print('Handshake started')
while True:
if proto.handshake_finished:
break
send_packet(ser, PacketType.HANDSHAKE, proto.write_message(), args.width)
if proto.handshake_finished:
break
pkt_type, payload = receive_packet(ser, args.width)
if pkt_type == PacketType.HANDSHAKE.value:
proto.read_message(payload)
else:
print(f'Incorrect packet type {pkt_type}. Ignoring since this is only test code.')
print('Handshake finished, handshake hash:')
hexdump(print, proto.get_handshake_hash(), args.width)
old_kcs = set()
def noise_rx(received, ui):
global old_kcs
data = proto.decrypt(received)
print('Decrypted data:')
hexdump(print, data, args.width)
rtype, rlen, *report = data
if rtype != 1 or rlen != 8:
return
modbyte, _reserved, *keycodes = report
keys = map_modifiers(modbyte) + map_regulars(keycodes)
print('Emitting:', keys)
keyset = set(keys)
for key in keyset - old_kcs:
ui.emit(key, 1, syn=False)
for key in old_kcs - keyset:
ui.emit(key, 0, syn=False)
ui.syn()
old_kcs = keyset
with uinput.Device(ALL_KEYS) as ui:
while True:
try:
pkt_type, received = receive_packet(ser, args.width)
if pkt_type != PacketType.DATA.value:
print(f'Unexpected packet type {pkt_type}. Ignoring.')
continue
try:
noise_rx(received, ui)
except NoiseInvalidMessage as e:
orig_n = proto.noise_protocol.cipher_state_decrypt.n
print('Invalid noise message', e)
for n in [orig_n+1, orig_n+2, orig_n+3]:
try:
proto.noise_protocol.cipher_state_decrypt.n = n
noise_rx(received, ui)
print(f' Recovered. n={n}')
break
except NoiseInvalidMessage as e:
pass
else:
print(' Unrecoverable.')
proto.noise_protocol.cipher_state_decrypt.n = orig_n
except Exception as e:
print('Invalid framing:', e)
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