from binascii import hexlify, unhexlify import traceback import sys from typing import NamedTuple, Any, Optional, Dict, Union, List, Tuple, TYPE_CHECKING from electrum.util import bfh, bh2u, versiontuple, UserCancelled, UserFacingException from electrum.bitcoin import TYPE_ADDRESS, TYPE_SCRIPT from electrum.bip32 import BIP32Node from electrum import constants from electrum.i18n import _ from electrum.plugin import Device from electrum.transaction import Transaction, PartialTransaction, PartialTxInput, PartialTxOutput from electrum.keystore import Hardware_KeyStore from electrum.base_wizard import ScriptTypeNotSupported 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, get_xpubs_and_der_suffixes_from_txinout) if TYPE_CHECKING: from .client import SafeTClient # Safe-T mini initialization methods TIM_NEW, TIM_RECOVER, TIM_MNEMONIC, TIM_PRIVKEY = range(0, 4) class SafeTKeyStore(Hardware_KeyStore): hw_type = 'safe_t' device = 'Safe-T mini' plugin: 'SafeTPlugin' 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_prefix() + "/%d/%d"%sequence address_n = client.expand_path(address_path) msg_sig = client.sign_message(self.plugin.get_coin_name(), address_n, message) return msg_sig.signature def sign_transaction(self, tx, password): if tx.is_complete(): return # previous transactions used as inputs prev_tx = {} for txin in tx.inputs(): tx_hash = txin.prevout.txid.hex() if txin.utxo is None and not Transaction.is_segwit_input(txin): raise UserFacingException(_('Missing previous tx for legacy input.')) prev_tx[tx_hash] = txin.utxo self.plugin.sign_transaction(self, tx, prev_tx) class SafeTPlugin(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://safe-t.io' libraries_URL = 'https://github.com/archos-safe-t/python-safet' minimum_firmware = (1, 0, 5) keystore_class = SafeTKeyStore minimum_library = (0, 1, 0) SUPPORTED_XTYPES = ('standard', 'p2wpkh-p2sh', 'p2wpkh', 'p2wsh-p2sh', 'p2wsh') MAX_LABEL_LEN = 32 def __init__(self, parent, config, name): HW_PluginBase.__init__(self, parent, config, name) self.libraries_available = self.check_libraries_available() if not self.libraries_available: return from . import client from . import transport import safetlib.messages self.client_class = client.SafeTClient self.types = safetlib.messages self.DEVICE_IDS = ('Safe-T mini',) self.transport_handler = transport.SafeTTransport() self.device_manager().register_enumerate_func(self.enumerate) def get_library_version(self): import safetlib try: return safetlib.__version__ except AttributeError: return 'unknown' def enumerate(self): devices = self.transport_handler.enumerate_devices() return [Device(path=d.get_path(), interface_number=-1, id_=d.get_path(), product_key='Safe-T mini', 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 = self.transport_handler.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}") client = self.client_class(transport, handler, self) # Try a ping for device sanity try: client.ping('t') except BaseException as e: self.logger.info(f"ping failed {e}") return None if not client.atleast_version(*self.minimum_firmware): msg = (_('Outdated {} firmware for device labelled {}. Please ' 'download the updated firmware from {}') .format(self.device, client.label(), self.firmware_URL)) self.logger.info(msg) if handler: handler.show_error(msg) else: raise UserFacingException(msg) return None return client def get_client(self, keystore, force_pair=True) -> Optional['SafeTClient']: 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")), (TIM_MNEMONIC, _("Upload a BIP39 mnemonic to generate the seed")), (TIM_PRIVKEY, _("Upload a master private key")) ] def f(method): import threading settings = self.request_safe_t_init_settings(wizard, method, self.device) 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, method, device_id, wizard, handler): item, label, pin_protection, passphrase_protection = settings if method == TIM_RECOVER: 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) language = 'english' 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 = 64 * (item + 2) # 128, 192 or 256 u2f_counter = 0 skip_backup = False client.reset_device(True, strength, passphrase_protection, pin_protection, label, language, u2f_counter, skip_backup) elif method == TIM_RECOVER: word_count = 6 * (item + 2) # 12, 18 or 24 client.step = 0 client.recovery_device(word_count, passphrase_protection, pin_protection, label, language) elif method == TIM_MNEMONIC: pin = pin_protection # It's the pin, not a boolean client.load_device_by_mnemonic(str(item), pin, passphrase_protection, label, language) else: pin = pin_protection # It's the pin, not a boolean client.load_device_by_xprv(item, pin, passphrase_protection, label, language) def _make_node_path(self, xpub, address_n): bip32node = BIP32Node.from_xkey(xpub) node = self.types.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 self.types.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.')) # 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) client.get_xpub('m', 'standard') 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_safet_input_script_type(self, electrum_txin_type: str): if electrum_txin_type in ('p2wpkh', 'p2wsh'): return self.types.InputScriptType.SPENDWITNESS if electrum_txin_type in ('p2wpkh-p2sh', 'p2wsh-p2sh'): return self.types.InputScriptType.SPENDP2SHWITNESS if electrum_txin_type in ('p2pkh', ): return self.types.InputScriptType.SPENDADDRESS if electrum_txin_type in ('p2sh', ): return self.types.InputScriptType.SPENDMULTISIG raise ValueError('unexpected txin type: {}'.format(electrum_txin_type)) def get_safet_output_script_type(self, electrum_txin_type: str): if electrum_txin_type in ('p2wpkh', 'p2wsh'): return self.types.OutputScriptType.PAYTOWITNESS if electrum_txin_type in ('p2wpkh-p2sh', 'p2wsh-p2sh'): return self.types.OutputScriptType.PAYTOP2SHWITNESS if electrum_txin_type in ('p2pkh', ): return self.types.OutputScriptType.PAYTOADDRESS if electrum_txin_type in ('p2sh', ): return self.types.OutputScriptType.PAYTOMULTISIG raise ValueError('unexpected txin type: {}'.format(electrum_txin_type)) def sign_transaction(self, keystore, tx: PartialTransaction, prev_tx): self.prev_tx = prev_tx client = self.get_client(keystore) inputs = self.tx_inputs(tx, for_sig=True, keystore=keystore) outputs = self.tx_outputs(tx, keystore=keystore) signatures = client.sign_tx(self.get_coin_name(), inputs, outputs, lock_time=tx.locktime, version=tx.version)[0] 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 client = self.get_client(keystore) if not client.atleast_version(1, 0): keystore.handler.show_error(_("Your device firmware is too old")) return deriv_suffix = wallet.get_address_index(address) derivation = keystore.get_derivation_prefix() address_path = "%s/%d/%d"%(derivation, *deriv_suffix) address_n = client.expand_path(address_path) script_type = self.get_safet_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 pubkey, xpub in sorted_pairs]) else: multisig = None client.get_address(self.get_coin_name(), address_n, True, multisig=multisig, script_type=script_type) def tx_inputs(self, tx: Transaction, *, for_sig=False, keystore: 'SafeTKeyStore' = None): inputs = [] for txin in tx.inputs(): txinputtype = self.types.TxInputType() if txin.is_coinbase(): prev_hash = b"\x00"*32 prev_index = 0xffffffff # signed int -1 else: if for_sig: assert isinstance(tx, PartialTransaction) assert isinstance(txin, PartialTxInput) assert keystore xpubs_and_deriv_suffixes = get_xpubs_and_der_suffixes_from_txinout(tx, txin) multisig = self._make_multisig(txin.num_sig, xpubs_and_deriv_suffixes) script_type = self.get_safet_input_script_type(txin.script_type) txinputtype = self.types.TxInputType( script_type=script_type, multisig=multisig) my_pubkey, full_path = keystore.find_my_pubkey_in_txinout(txin) if full_path: txinputtype.address_n = full_path prev_hash = txin.prevout.txid prev_index = txin.prevout.out_idx if txin.value_sats() is not None: txinputtype.amount = txin.value_sats() txinputtype.prev_hash = prev_hash txinputtype.prev_index = prev_index if txin.script_sig is not None: txinputtype.script_sig = txin.script_sig txinputtype.sequence = txin.nsequence inputs.append(txinputtype) return inputs def _make_multisig(self, m, xpubs): if len(xpubs) == 1: return None pubkeys = [self._make_node_path(xpub, deriv) for xpub, deriv in xpubs] return self.types.MultisigRedeemScriptType( pubkeys=pubkeys, signatures=[b''] * len(pubkeys), m=m) def tx_outputs(self, tx: PartialTransaction, *, keystore: 'SafeTKeyStore' = None): def create_output_by_derivation(): script_type = self.get_safet_output_script_type(txout.script_type) xpubs_and_deriv_suffixes = get_xpubs_and_der_suffixes_from_txinout(tx, txout) multisig = self._make_multisig(txout.num_sig, xpubs_and_deriv_suffixes) my_pubkey, full_path = keystore.find_my_pubkey_in_txinout(txout) assert full_path txoutputtype = self.types.TxOutputType( multisig=multisig, amount=txout.value, address_n=full_path, script_type=script_type) return txoutputtype def create_output_by_address(): txoutputtype = self.types.TxOutputType() txoutputtype.amount = txout.value if address: txoutputtype.script_type = self.types.OutputScriptType.PAYTOADDRESS txoutputtype.address = address else: txoutputtype.script_type = self.types.OutputScriptType.PAYTOOPRETURN txoutputtype.op_return_data = trezor_validate_op_return_output_and_get_data(txout) return txoutputtype outputs = [] has_change = False any_output_on_change_branch = is_any_tx_output_on_change_branch(tx) for txout in tx.outputs(): address = txout.address use_create_by_derivation = False if txout.is_mine and not has_change: # 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 txout.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: Optional[Transaction]): t = self.types.TransactionType() if tx is None: # probably for segwit input and we don't need this prev txn return t tx.deserialize() t.version = tx.version t.lock_time = tx.locktime inputs = self.tx_inputs(tx) t._extend_inputs(inputs) for out in tx.outputs(): o = t._add_bin_outputs() o.amount = out.value o.script_pubkey = out.scriptpubkey return t # This function is called from the TREZOR libraries (via tx_api) def get_tx(self, tx_hash): tx = self.prev_tx[tx_hash] return self.electrum_tx_to_txtype(tx)