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electrum/electrum/plugins/trezor/trezor.py

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import traceback
import sys
from typing import NamedTuple, Any
from electrum.util import bfh, bh2u, versiontuple, UserCancelled, UserFacingException
from electrum.bitcoin import TYPE_ADDRESS, TYPE_SCRIPT
from electrum.bip32 import BIP32Node, convert_bip32_path_to_list_of_uint32 as parse_path
from electrum import constants
from electrum.i18n import _
from electrum.plugin import Device
from electrum.transaction import deserialize, Transaction
from electrum.keystore import Hardware_KeyStore, is_xpubkey, parse_xpubkey
from electrum.base_wizard import ScriptTypeNotSupported, HWD_SETUP_NEW_WALLET
from electrum.logging import get_logger
from ..hw_wallet import HW_PluginBase
from ..hw_wallet.plugin import (is_any_tx_output_on_change_branch, trezor_validate_op_return_output_and_get_data,
LibraryFoundButUnusable, OutdatedHwFirmwareException)
_logger = get_logger(__name__)
try:
import trezorlib
import trezorlib.transport
from trezorlib.transport.bridge import BridgeTransport, call_bridge
from .clientbase import TrezorClientBase
from trezorlib.messages import (
RecoveryDeviceType, HDNodeType, HDNodePathType,
InputScriptType, OutputScriptType, MultisigRedeemScriptType,
TxInputType, TxOutputType, TxOutputBinType, TransactionType, SignTx)
RECOVERY_TYPE_SCRAMBLED_WORDS = RecoveryDeviceType.ScrambledWords
RECOVERY_TYPE_MATRIX = RecoveryDeviceType.Matrix
TREZORLIB = True
except Exception as e:
_logger.exception('error importing trezorlib')
TREZORLIB = False
RECOVERY_TYPE_SCRAMBLED_WORDS, RECOVERY_TYPE_MATRIX = range(2)
# Trezor initialization methods
TIM_NEW, TIM_RECOVER = range(2)
TREZOR_PRODUCT_KEY = 'Trezor'
class TrezorKeyStore(Hardware_KeyStore):
hw_type = 'trezor'
device = TREZOR_PRODUCT_KEY
def get_derivation(self):
return self.derivation
def get_client(self, force_pair=True):
return self.plugin.get_client(self, force_pair)
def decrypt_message(self, sequence, message, password):
raise UserFacingException(_('Encryption and decryption are not implemented by {}').format(self.device))
def sign_message(self, sequence, message, password):
client = self.get_client()
address_path = self.get_derivation() + "/%d/%d"%sequence
msg_sig = client.sign_message(address_path, message)
return msg_sig.signature
def sign_transaction(self, tx, password):
if tx.is_complete():
return
# previous transactions used as inputs
prev_tx = {}
# path of the xpubs that are involved
xpub_path = {}
for txin in tx.inputs():
pubkeys, x_pubkeys = tx.get_sorted_pubkeys(txin)
tx_hash = txin['prevout_hash']
if txin.get('prev_tx') is None and not Transaction.is_segwit_input(txin):
raise UserFacingException(_('Offline signing with {} is not supported for legacy inputs.').format(self.device))
prev_tx[tx_hash] = txin['prev_tx']
for x_pubkey in x_pubkeys:
if not is_xpubkey(x_pubkey):
continue
xpub, s = parse_xpubkey(x_pubkey)
if xpub == self.get_master_public_key():
xpub_path[xpub] = self.get_derivation()
self.plugin.sign_transaction(self, tx, prev_tx, xpub_path)
class TrezorInitSettings(NamedTuple):
word_count: int
label: str
pin_enabled: bool
passphrase_enabled: bool
recovery_type: Any = None
no_backup: bool = False
class TrezorPlugin(HW_PluginBase):
# Derived classes provide:
#
# class-static variables: client_class, firmware_URL, handler_class,
# libraries_available, libraries_URL, minimum_firmware,
# wallet_class, types
firmware_URL = 'https://wallet.trezor.io'
libraries_URL = 'https://github.com/trezor/python-trezor'
minimum_firmware = (1, 5, 2)
keystore_class = TrezorKeyStore
minimum_library = (0, 11, 0)
maximum_library = (0, 12)
SUPPORTED_XTYPES = ('standard', 'p2wpkh-p2sh', 'p2wpkh', 'p2wsh-p2sh', 'p2wsh')
DEVICE_IDS = (TREZOR_PRODUCT_KEY,)
MAX_LABEL_LEN = 32
def __init__(self, parent, config, name):
super().__init__(parent, config, name)
self.libraries_available = self.check_libraries_available()
if not self.libraries_available:
return
self.device_manager().register_enumerate_func(self.enumerate)
def get_library_version(self):
import trezorlib
try:
version = trezorlib.__version__
except Exception:
version = 'unknown'
if TREZORLIB:
return version
else:
raise LibraryFoundButUnusable(library_version=version)
def enumerate(self):
# If there is a bridge, prefer that.
# On Windows, the bridge runs as Admin (and Electrum usually does not),
# so the bridge has better chances of finding devices. see #5420
# This also avoids duplicate entries.
try:
call_bridge("enumerate")
except Exception:
devices = trezorlib.transport.enumerate_devices()
else:
devices = BridgeTransport.enumerate()
return [Device(path=d.get_path(),
interface_number=-1,
id_=d.get_path(),
product_key=TREZOR_PRODUCT_KEY,
usage_page=0,
transport_ui_string=d.get_path())
for d in devices]
def create_client(self, device, handler):
try:
self.logger.info(f"connecting to device at {device.path}")
transport = trezorlib.transport.get_transport(device.path)
except BaseException as e:
self.logger.info(f"cannot connect at {device.path} {e}")
return None
if not transport:
self.logger.info(f"cannot connect at {device.path}")
return
self.logger.info(f"connected to device at {device.path}")
# note that this call can still raise!
return TrezorClientBase(transport, handler, self)
def get_client(self, keystore, force_pair=True):
devmgr = self.device_manager()
handler = keystore.handler
with devmgr.hid_lock:
client = devmgr.client_for_keystore(self, handler, keystore, force_pair)
# returns the client for a given keystore. can use xpub
if client:
client.used()
return client
def get_coin_name(self):
return "Testnet" if constants.net.TESTNET else "Bitcoin"
def initialize_device(self, device_id, wizard, handler):
# Initialization method
msg = _("Choose how you want to initialize your {}.\n\n"
"The first two methods are secure as no secret information "
"is entered into your computer.\n\n"
"For the last two methods you input secrets on your keyboard "
"and upload them to your {}, and so you should "
"only do those on a computer you know to be trustworthy "
"and free of malware."
).format(self.device, self.device)
choices = [
# Must be short as QT doesn't word-wrap radio button text
(TIM_NEW, _("Let the device generate a completely new seed randomly")),
(TIM_RECOVER, _("Recover from a seed you have previously written down")),
]
def f(method):
import threading
settings = self.request_trezor_init_settings(wizard, method, device_id)
t = threading.Thread(target=self._initialize_device_safe, args=(settings, method, device_id, wizard, handler))
t.setDaemon(True)
t.start()
exit_code = wizard.loop.exec_()
if exit_code != 0:
# this method (initialize_device) was called with the expectation
# of leaving the device in an initialized state when finishing.
# signal that this is not the case:
raise UserCancelled()
wizard.choice_dialog(title=_('Initialize Device'), message=msg, choices=choices, run_next=f)
def _initialize_device_safe(self, settings, method, device_id, wizard, handler):
exit_code = 0
try:
self._initialize_device(settings, method, device_id, wizard, handler)
except UserCancelled:
exit_code = 1
except BaseException as e:
self.logger.exception('')
handler.show_error(repr(e))
exit_code = 1
finally:
wizard.loop.exit(exit_code)
def _initialize_device(self, settings: TrezorInitSettings, method, device_id, wizard, handler):
if method == TIM_RECOVER and settings.recovery_type == RECOVERY_TYPE_SCRAMBLED_WORDS:
handler.show_error(_(
"You will be asked to enter 24 words regardless of your "
"seed's actual length. If you enter a word incorrectly or "
"misspell it, you cannot change it or go back - you will need "
"to start again from the beginning.\n\nSo please enter "
"the words carefully!"),
blocking=True)
devmgr = self.device_manager()
client = devmgr.client_by_id(device_id)
if not client:
raise Exception(_("The device was disconnected."))
if method == TIM_NEW:
strength_from_word_count = {12: 128, 18: 192, 24: 256}
client.reset_device(
strength=strength_from_word_count[settings.word_count],
passphrase_protection=settings.passphrase_enabled,
pin_protection=settings.pin_enabled,
label=settings.label,
no_backup=settings.no_backup)
elif method == TIM_RECOVER:
client.recover_device(
recovery_type=settings.recovery_type,
word_count=settings.word_count,
passphrase_protection=settings.passphrase_enabled,
pin_protection=settings.pin_enabled,
label=settings.label)
if settings.recovery_type == RECOVERY_TYPE_MATRIX:
handler.close_matrix_dialog()
else:
raise RuntimeError("Unsupported recovery method")
def _make_node_path(self, xpub, address_n):
bip32node = BIP32Node.from_xkey(xpub)
node = HDNodeType(
depth=bip32node.depth,
fingerprint=int.from_bytes(bip32node.fingerprint, 'big'),
child_num=int.from_bytes(bip32node.child_number, 'big'),
chain_code=bip32node.chaincode,
public_key=bip32node.eckey.get_public_key_bytes(compressed=True),
)
return HDNodePathType(node=node, address_n=address_n)
def setup_device(self, device_info, wizard, purpose):
devmgr = self.device_manager()
device_id = device_info.device.id_
client = devmgr.client_by_id(device_id)
if client is None:
raise UserFacingException(_('Failed to create a client for this device.') + '\n' +
_('Make sure it is in the correct state.'))
if not client.is_uptodate():
msg = (_('Outdated {} firmware for device labelled {}. Please '
'download the updated firmware from {}')
.format(self.device, client.label(), self.firmware_URL))
raise OutdatedHwFirmwareException(msg)
# fixme: we should use: client.handler = wizard
client.handler = self.create_handler(wizard)
if not device_info.initialized:
self.initialize_device(device_id, wizard, client.handler)
is_creating_wallet = purpose == HWD_SETUP_NEW_WALLET
client.get_xpub('m', 'standard', creating=is_creating_wallet)
client.used()
def get_xpub(self, device_id, derivation, xtype, wizard):
if xtype not in self.SUPPORTED_XTYPES:
raise ScriptTypeNotSupported(_('This type of script is not supported with {}.').format(self.device))
devmgr = self.device_manager()
client = devmgr.client_by_id(device_id)
client.handler = wizard
xpub = client.get_xpub(derivation, xtype)
client.used()
return xpub
def get_trezor_input_script_type(self, electrum_txin_type: str):
if electrum_txin_type in ('p2wpkh', 'p2wsh'):
return InputScriptType.SPENDWITNESS
if electrum_txin_type in ('p2wpkh-p2sh', 'p2wsh-p2sh'):
return InputScriptType.SPENDP2SHWITNESS
if electrum_txin_type in ('p2pkh', ):
return InputScriptType.SPENDADDRESS
if electrum_txin_type in ('p2sh', ):
return InputScriptType.SPENDMULTISIG
raise ValueError('unexpected txin type: {}'.format(electrum_txin_type))
def get_trezor_output_script_type(self, electrum_txin_type: str):
if electrum_txin_type in ('p2wpkh', 'p2wsh'):
return OutputScriptType.PAYTOWITNESS
if electrum_txin_type in ('p2wpkh-p2sh', 'p2wsh-p2sh'):
return OutputScriptType.PAYTOP2SHWITNESS
if electrum_txin_type in ('p2pkh', ):
return OutputScriptType.PAYTOADDRESS
if electrum_txin_type in ('p2sh', ):
return OutputScriptType.PAYTOMULTISIG
raise ValueError('unexpected txin type: {}'.format(electrum_txin_type))
def sign_transaction(self, keystore, tx, prev_tx, xpub_path):
prev_tx = { bfh(txhash): self.electrum_tx_to_txtype(tx, xpub_path) for txhash, tx in prev_tx.items() }
client = self.get_client(keystore)
inputs = self.tx_inputs(tx, xpub_path, True)
outputs = self.tx_outputs(keystore.get_derivation(), tx)
details = SignTx(lock_time=tx.locktime, version=tx.version)
signatures, _ = client.sign_tx(self.get_coin_name(), inputs, outputs, details=details, prev_txes=prev_tx)
signatures = [(bh2u(x) + '01') for x in signatures]
tx.update_signatures(signatures)
def show_address(self, wallet, address, keystore=None):
if keystore is None:
keystore = wallet.get_keystore()
if not self.show_address_helper(wallet, address, keystore):
return
deriv_suffix = wallet.get_address_index(address)
derivation = keystore.derivation
address_path = "%s/%d/%d"%(derivation, *deriv_suffix)
script_type = self.get_trezor_input_script_type(wallet.txin_type)
# prepare multisig, if available:
xpubs = wallet.get_master_public_keys()
if len(xpubs) > 1:
pubkeys = wallet.get_public_keys(address)
# sort xpubs using the order of pubkeys
sorted_pairs = sorted(zip(pubkeys, xpubs))
multisig = self._make_multisig(
wallet.m,
[(xpub, deriv_suffix) for _, xpub in sorted_pairs])
else:
multisig = None
client = self.get_client(keystore)
client.show_address(address_path, script_type, multisig)
def tx_inputs(self, tx, xpub_path, for_sig=False):
inputs = []
for txin in tx.inputs():
txinputtype = TxInputType()
if txin['type'] == 'coinbase':
prev_hash = b"\x00"*32
prev_index = 0xffffffff # signed int -1
else:
if for_sig:
x_pubkeys = txin['x_pubkeys']
xpubs = [parse_xpubkey(x) for x in x_pubkeys]
multisig = self._make_multisig(txin.get('num_sig'), xpubs, txin.get('signatures'))
script_type = self.get_trezor_input_script_type(txin['type'])
txinputtype = TxInputType(
script_type=script_type,
multisig=multisig)
# find which key is mine
for xpub, deriv in xpubs:
if xpub in xpub_path:
xpub_n = parse_path(xpub_path[xpub])
txinputtype.address_n = xpub_n + deriv
break
prev_hash = bfh(txin['prevout_hash'])
prev_index = txin['prevout_n']
if 'value' in txin:
txinputtype.amount = txin['value']
txinputtype.prev_hash = prev_hash
txinputtype.prev_index = prev_index
if txin.get('scriptSig') is not None:
script_sig = bfh(txin['scriptSig'])
txinputtype.script_sig = script_sig
txinputtype.sequence = txin.get('sequence', 0xffffffff - 1)
inputs.append(txinputtype)
return inputs
def _make_multisig(self, m, xpubs, signatures=None):
if len(xpubs) == 1:
return None
pubkeys = [self._make_node_path(xpub, deriv) for xpub, deriv in xpubs]
if signatures is None:
signatures = [b''] * len(pubkeys)
elif len(signatures) != len(pubkeys):
raise RuntimeError('Mismatched number of signatures')
else:
signatures = [bfh(x)[:-1] if x else b'' for x in signatures]
return MultisigRedeemScriptType(
pubkeys=pubkeys,
signatures=signatures,
m=m)
def tx_outputs(self, derivation, tx: Transaction):
def create_output_by_derivation():
script_type = self.get_trezor_output_script_type(info.script_type)
deriv = parse_path("/%d/%d" % index)
multisig = self._make_multisig(m, [(xpub, deriv) for xpub in xpubs])
txoutputtype = TxOutputType(
multisig=multisig,
amount=amount,
address_n=parse_path(derivation + "/%d/%d" % index),
script_type=script_type)
return txoutputtype
def create_output_by_address():
txoutputtype = TxOutputType()
txoutputtype.amount = amount
if _type == TYPE_SCRIPT:
txoutputtype.script_type = OutputScriptType.PAYTOOPRETURN
txoutputtype.op_return_data = trezor_validate_op_return_output_and_get_data(o)
elif _type == TYPE_ADDRESS:
txoutputtype.script_type = OutputScriptType.PAYTOADDRESS
txoutputtype.address = address
return txoutputtype
outputs = []
has_change = False
any_output_on_change_branch = is_any_tx_output_on_change_branch(tx)
for o in tx.outputs():
_type, address, amount = o.type, o.address, o.value
use_create_by_derivation = False
info = tx.output_info.get(address)
if info is not None and not has_change:
index, xpubs, m = info.address_index, info.sorted_xpubs, info.num_sig
# prioritise hiding outputs on the 'change' branch from user
# because no more than one change address allowed
# note: ^ restriction can be removed once we require fw
# that has https://github.com/trezor/trezor-mcu/pull/306
if info.is_change == any_output_on_change_branch:
use_create_by_derivation = True
has_change = True
if use_create_by_derivation:
txoutputtype = create_output_by_derivation()
else:
txoutputtype = create_output_by_address()
outputs.append(txoutputtype)
return outputs
def electrum_tx_to_txtype(self, tx, xpub_path):
t = TransactionType()
if tx is None:
# probably for segwit input and we don't need this prev txn
return t
d = deserialize(tx.raw)
t.version = d['version']
t.lock_time = d['lockTime']
t.inputs = self.tx_inputs(tx, xpub_path)
t.bin_outputs = [
TxOutputBinType(amount=vout['value'], script_pubkey=bfh(vout['scriptPubKey']))
for vout in d['outputs']
]
return t