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455 lines
17 KiB
455 lines
17 KiB
import re
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import time
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from binascii import unhexlify
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from struct import pack
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from unicodedata import normalize
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from electrum.account import BIP32_Account
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from electrum.bitcoin import (bc_address_to_hash_160, xpub_from_pubkey,
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EncodeBase58Check)
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from electrum.i18n import _
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from electrum.plugins import BasePlugin, hook
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from electrum.transaction import (deserialize, is_extended_pubkey,
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Transaction, x_to_xpub)
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from electrum.wallet import BIP32_HD_Wallet, BIP44_Wallet
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class DeviceDisconnectedError(Exception):
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pass
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class TrezorCompatibleWallet(BIP44_Wallet):
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# Extend BIP44 Wallet as required by hardware implementation.
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# Derived classes must set:
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# - device
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# - wallet_type
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restore_wallet_class = BIP44_Wallet
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def __init__(self, storage):
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BIP44_Wallet.__init__(self, storage)
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# This is set when paired with a device, and used to re-pair
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# a device that is disconnected and re-connected
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self.device_id = None
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# Errors and other user interaction is done through the wallet's
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# handler. The handler is per-window and preserved across
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# device reconnects
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self.handler = None
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def disconnected(self):
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self.print_error("disconnected")
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self.handler.watching_only_changed()
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def connected(self):
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self.print_error("connected")
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self.handler.watching_only_changed()
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def get_action(self):
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pass
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def can_export(self):
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return False
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def is_watching_only(self):
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'''The wallet is watching-only if its trezor device is not
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connected. This result is dynamic and changes over time.'''
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assert not self.has_seed()
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return self.plugin.lookup_client(self) is None
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def can_change_password(self):
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return False
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def client(self):
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return self.plugin.client(self)
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def derive_xkeys(self, root, derivation, password):
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if self.master_public_keys.get(root):
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return BIP44_wallet.derive_xkeys(self, root, derivation, password)
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# When creating a wallet we need to ask the device for the
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# master public key
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derivation = derivation.replace(self.root_name, self.prefix() + "/")
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xpub = self.get_public_key(derivation)
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return xpub, None
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def get_public_key(self, bip32_path):
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client = self.client()
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address_n = client.expand_path(bip32_path)
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node = client.get_public_node(address_n).node
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xpub = ("0488B21E".decode('hex') + chr(node.depth)
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+ self.i4b(node.fingerprint) + self.i4b(node.child_num)
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+ node.chain_code + node.public_key)
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return EncodeBase58Check(xpub)
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def i4b(self, x):
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return pack('>I', x)
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def decrypt_message(self, pubkey, message, password):
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raise RuntimeError(_('Decrypt method is not implemented'))
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def sign_message(self, address, message, password):
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client = self.client()
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address_path = self.address_id(address)
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address_n = client.expand_path(address_path)
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msg_sig = client.sign_message('Bitcoin', address_n, message)
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return msg_sig.signature
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def sign_transaction(self, tx, password):
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if tx.is_complete() or self.is_watching_only():
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return
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# previous transactions used as inputs
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prev_tx = {}
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# path of the xpubs that are involved
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xpub_path = {}
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for txin in tx.inputs:
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tx_hash = txin['prevout_hash']
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ptx = self.transactions.get(tx_hash)
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if ptx is None:
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ptx = self.network.synchronous_get(('blockchain.transaction.get', [tx_hash]))
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ptx = Transaction(ptx)
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prev_tx[tx_hash] = ptx
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for x_pubkey in txin['x_pubkeys']:
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if not is_extended_pubkey(x_pubkey):
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continue
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xpub = x_to_xpub(x_pubkey)
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for k, v in self.master_public_keys.items():
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if v == xpub:
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acc_id = re.match("x/(\d+)'", k).group(1)
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xpub_path[xpub] = self.account_derivation(acc_id)
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self.plugin.sign_transaction(self, tx, prev_tx, xpub_path)
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class TrezorCompatiblePlugin(BasePlugin):
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# Derived classes provide:
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#
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# class-static variables: client_class, firmware_URL, handler_class,
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# libraries_available, libraries_URL, minimum_firmware,
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# wallet_class, ckd_public, types, HidTransport
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# This plugin automatically keeps track of attached devices, and
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# connects to anything attached creating a new Client instance.
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# When disconnected, the client is informed via a callback.
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# As a device can be disconnected and/or reconnected in a different
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# USB port (giving it a new path), the wallet must be dynamic in
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# asking for its client.
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# If a wallet is successfully paired with a given device, the plugin
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# stores its serial number in the wallet so it can be automatically
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# re-paired if the same device is connected elsewhere.
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# Approaching things this way permits several devices to be connected
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# simultaneously and handled smoothly.
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def __init__(self, parent, config, name):
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BasePlugin.__init__(self, parent, config, name)
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self.device = self.wallet_class.device
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self.wallet_class.plugin = self
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# A set of client instances to USB paths
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self.clients = set()
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# The device wallets we have seen to inform on reconnection
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self.paired_wallets = set()
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# Do an initial scan
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self.last_scan = 0
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self.timer_actions()
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@hook
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def timer_actions(self):
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if self.libraries_available:
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# Scan connected devices every second
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now = time.time()
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if now > self.last_scan + 1:
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self.last_scan = now
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self.scan_devices()
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def scan_devices(self):
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paths = self.HidTransport.enumerate()
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connected = set([c for c in self.clients if c.path in paths])
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disconnected = self.clients - connected
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self.clients = connected
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# Inform clients and wallets they were disconnected
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for client in disconnected:
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self.print_error("device disconnected:", client)
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if client.wallet:
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client.wallet.disconnected()
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for path in paths:
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# Look for new paths
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if any(c.path == path for c in connected):
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continue
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try:
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transport = self.HidTransport(path)
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except BaseException as e:
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# We were probably just disconnected; never mind
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self.print_error("cannot connect at", path, str(e))
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continue
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self.print_error("connected to device at", path[0])
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try:
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client = self.client_class(transport, path, self)
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except BaseException as e:
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self.print_error("cannot create client for", path, str(e))
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else:
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self.clients.add(client)
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self.print_error("new device:", client)
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# Inform reconnected wallets
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for wallet in self.paired_wallets:
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if wallet.device_id == client.features.device_id:
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client.wallet = wallet
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wallet.connected()
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def clear_session(self, client):
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# Clearing the session forces pin re-entry
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self.print_error("clear session:", client)
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client.clear_session()
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def select_device(self, wallet, wizard):
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'''Called when creating a new wallet. Select the device
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to use.'''
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clients = list(self.clients)
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if not len(clients):
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return
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if len(clients) > 1:
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labels = [client.label() for client in clients]
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msg = _("Please select which %s device to use:") % self.device
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client = clients[wizard.query_choice(msg, labels)]
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else:
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client = clients[0]
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self.pair_wallet(wallet, client)
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def pair_wallet(self, wallet, client):
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self.print_error("pairing wallet %s to device %s" % (wallet, client))
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self.paired_wallets.add(wallet)
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wallet.device_id = client.features.device_id
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client.wallet = wallet
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wallet.connected()
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def try_to_pair_wallet(self, wallet):
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'''Call this when loading an existing wallet to find if the
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associated device is connected.'''
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account = '0'
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if not account in wallet.accounts:
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self.print_error("try pair_wallet: wallet has no accounts")
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return None
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first_address = wallet.accounts[account].first_address()[0]
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derivation = wallet.address_derivation(account, 0, 0)
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for client in self.clients:
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if client.wallet:
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continue
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if not client.atleast_version(*self.minimum_firmware):
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wallet.handler.show_error(
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_('Outdated %s firmware for device labelled %s. Please '
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'download the updated firmware from %s') %
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(self.device, client.label(), self.firmware_URL))
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continue
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# This gives us a handler
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client.wallet = wallet
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device_address = None
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try:
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device_address = client.address_from_derivation(derivation)
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finally:
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client.wallet = None
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if first_address == device_address:
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self.pair_wallet(wallet, client)
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return client
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return None
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def lookup_client(self, wallet):
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for client in self.clients:
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if client.features.device_id == wallet.device_id:
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return client
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return None
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def client(self, wallet):
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'''Returns a wrapped client which handles cleanup in case of
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thrown exceptions, etc.'''
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assert isinstance(wallet, self.wallet_class)
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assert wallet.handler != None
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if wallet.device_id is None:
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client = self.try_to_pair_wallet(wallet)
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else:
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client = self.lookup_client(wallet)
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if not client:
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msg = (_('Could not connect to your %s. Verify the '
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'cable is connected and that no other app is '
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'using it.\nContinuing in watching-only mode '
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'until the device is re-connected.') % self.device)
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if not self.clients:
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wallet.handler.show_error(msg)
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raise DeviceDisconnectedError(msg)
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return client
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def is_enabled(self):
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return self.libraries_available
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@staticmethod
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def normalize_passphrase(self, passphrase):
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return normalize('NFKD', unicode(passphrase or ''))
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def on_restore_wallet(self, wallet, wizard):
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assert isinstance(wallet, self.wallet_class)
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msg = _("Enter the seed for your %s wallet:" % self.device)
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seed = wizard.request_seed(msg, is_valid = self.is_valid_seed)
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# Restored wallets are not hardware wallets
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wallet_class = self.wallet_class.restore_wallet_class
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wallet.storage.put('wallet_type', wallet_class.wallet_type)
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wallet = wallet_class(wallet.storage)
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passphrase = wizard.request_passphrase(self.device, restore=True)
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password = wizard.request_password()
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wallet.add_seed(seed, password)
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wallet.add_cosigner_seed(seed, 'x/', password, passphrase)
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wallet.create_main_account(password)
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return wallet
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@hook
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def close_wallet(self, wallet):
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# Don't retain references to a closed wallet
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self.paired_wallets.discard(wallet)
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client = self.lookup_client(wallet)
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if client:
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self.clear_session(client)
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# Release the device
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self.clients.discard(client)
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client.transport.close()
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def sign_transaction(self, wallet, tx, prev_tx, xpub_path):
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self.prev_tx = prev_tx
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self.xpub_path = xpub_path
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client = self.client(wallet)
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inputs = self.tx_inputs(tx, True)
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outputs = self.tx_outputs(wallet, tx)
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signed_tx = client.sign_tx('Bitcoin', inputs, outputs)[1]
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raw = signed_tx.encode('hex')
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tx.update_signatures(raw)
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def show_address(self, wallet, address):
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client = self.client(wallet)
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if not client.atleast_version(1, 3):
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wallet.handler.show_error(_("Your device firmware is too old"))
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return
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address_path = wallet.address_id(address)
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address_n = client.expand_path(address_path)
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client.get_address('Bitcoin', address_n, True)
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def tx_inputs(self, tx, for_sig=False):
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inputs = []
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for txin in tx.inputs:
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txinputtype = self.types.TxInputType()
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if txin.get('is_coinbase'):
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prev_hash = "\0"*32
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prev_index = 0xffffffff # signed int -1
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else:
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if for_sig:
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x_pubkeys = txin['x_pubkeys']
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if len(x_pubkeys) == 1:
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x_pubkey = x_pubkeys[0]
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xpub, s = BIP32_Account.parse_xpubkey(x_pubkey)
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xpub_n = self.client_class.expand_path(self.xpub_path[xpub])
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txinputtype.address_n.extend(xpub_n + s)
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else:
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def f(x_pubkey):
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if is_extended_pubkey(x_pubkey):
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xpub, s = BIP32_Account.parse_xpubkey(x_pubkey)
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else:
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xpub = xpub_from_pubkey(x_pubkey.decode('hex'))
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s = []
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node = ckd_public.deserialize(xpub)
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return self.types.HDNodePathType(node=node, address_n=s)
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pubkeys = map(f, x_pubkeys)
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multisig = self.types.MultisigRedeemScriptType(
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pubkeys=pubkeys,
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signatures=map(lambda x: x.decode('hex') if x else '', txin.get('signatures')),
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m=txin.get('num_sig'),
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)
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txinputtype = self.types.TxInputType(
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script_type=self.types.SPENDMULTISIG,
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multisig=multisig
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)
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# find which key is mine
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for x_pubkey in x_pubkeys:
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if is_extended_pubkey(x_pubkey):
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xpub, s = BIP32_Account.parse_xpubkey(x_pubkey)
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if xpub in self.xpub_path:
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xpub_n = self.client_class.expand_path(self.xpub_path[xpub])
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txinputtype.address_n.extend(xpub_n + s)
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break
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prev_hash = unhexlify(txin['prevout_hash'])
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prev_index = txin['prevout_n']
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txinputtype.prev_hash = prev_hash
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txinputtype.prev_index = prev_index
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if 'scriptSig' in txin:
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script_sig = txin['scriptSig'].decode('hex')
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txinputtype.script_sig = script_sig
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if 'sequence' in txin:
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sequence = txin['sequence']
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txinputtype.sequence = sequence
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inputs.append(txinputtype)
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return inputs
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def tx_outputs(self, wallet, tx):
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outputs = []
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for type, address, amount in tx.outputs:
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assert type == 'address'
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txoutputtype = self.types.TxOutputType()
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if wallet.is_change(address):
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address_path = wallet.address_id(address)
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address_n = self.client_class.expand_path(address_path)
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txoutputtype.address_n.extend(address_n)
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else:
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txoutputtype.address = address
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txoutputtype.amount = amount
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addrtype, hash_160 = bc_address_to_hash_160(address)
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if addrtype == 0:
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txoutputtype.script_type = self.types.PAYTOADDRESS
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elif addrtype == 5:
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txoutputtype.script_type = self.types.PAYTOSCRIPTHASH
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else:
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raise BaseException('addrtype')
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outputs.append(txoutputtype)
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return outputs
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def electrum_tx_to_txtype(self, tx):
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t = self.types.TransactionType()
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d = deserialize(tx.raw)
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t.version = d['version']
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t.lock_time = d['lockTime']
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inputs = self.tx_inputs(tx)
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t.inputs.extend(inputs)
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for vout in d['outputs']:
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o = t.bin_outputs.add()
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o.amount = vout['value']
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o.script_pubkey = vout['scriptPubKey'].decode('hex')
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return t
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# This function is called from the trezor libraries (via tx_api)
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def get_tx(self, tx_hash):
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tx = self.prev_tx[tx_hash]
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tx.deserialize()
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return self.electrum_tx_to_txtype(tx)
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@staticmethod
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def is_valid_seed(seed):
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return True
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