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395 lines
17 KiB
395 lines
17 KiB
from binascii import hexlify
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from struct import unpack
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import hashlib
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import time
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import electrum
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from electrum.bitcoin import EncodeBase58Check, DecodeBase58Check, TYPE_ADDRESS
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from electrum.i18n import _
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from electrum.plugins import BasePlugin, hook
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from ..hw_wallet import BIP44_HW_Wallet
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from ..hw_wallet import HW_PluginBase
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from electrum.util import format_satoshis_plain, print_error
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try:
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from btchip.btchipComm import getDongle, DongleWait
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from btchip.btchip import btchip
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from btchip.btchipUtils import compress_public_key,format_transaction, get_regular_input_script
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from btchip.bitcoinTransaction import bitcoinTransaction
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from btchip.btchipPersoWizard import StartBTChipPersoDialog
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from btchip.btchipFirmwareWizard import checkFirmware, updateFirmware
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from btchip.btchipException import BTChipException
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BTCHIP = True
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BTCHIP_DEBUG = False
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except ImportError:
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BTCHIP = False
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class BTChipWallet(BIP44_HW_Wallet):
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wallet_type = 'btchip'
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device = 'Ledger'
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def __init__(self, storage):
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BIP44_HW_Wallet.__init__(self, storage)
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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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self.force_watching_only = False
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self.device_checked = False
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self.signing = False
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def give_error(self, message, clear_client = False):
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print_error(message)
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if not self.signing:
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self.handler.show_error(message)
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else:
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self.signing = False
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if clear_client:
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self.plugin.client = None
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self.device_checked = False
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raise Exception(message)
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def address_id(self, address):
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# Strip the leading "m/"
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return BIP44_HW_Wallet.address_id(self, address)[2:]
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def get_public_key(self, bip32_path):
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# bip32_path is of the form 44'/0'/1'
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# S-L-O-W - we don't handle the fingerprint directly, so compute
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# it manually from the previous node
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# This only happens once so it's bearable
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self.get_client() # prompt for the PIN before displaying the dialog if necessary
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self.handler.show_message("Computing master public key")
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try:
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splitPath = bip32_path.split('/')
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if splitPath[0] == 'm':
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splitPath = splitPath[1:]
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bip32_path = bip32_path[2:]
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fingerprint = 0
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if len(splitPath) > 1:
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prevPath = "/".join(splitPath[0:len(splitPath) - 1])
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nodeData = self.get_client().getWalletPublicKey(prevPath)
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publicKey = compress_public_key(nodeData['publicKey'])
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h = hashlib.new('ripemd160')
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h.update(hashlib.sha256(publicKey).digest())
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fingerprint = unpack(">I", h.digest()[0:4])[0]
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nodeData = self.get_client().getWalletPublicKey(bip32_path)
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publicKey = compress_public_key(nodeData['publicKey'])
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depth = len(splitPath)
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lastChild = splitPath[len(splitPath) - 1].split('\'')
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if len(lastChild) == 1:
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childnum = int(lastChild[0])
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else:
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childnum = 0x80000000 | int(lastChild[0])
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xpub = "0488B21E".decode('hex') + chr(depth) + self.i4b(fingerprint) + self.i4b(childnum) + str(nodeData['chainCode']) + str(publicKey)
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except Exception, e:
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self.give_error(e, True)
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finally:
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self.handler.clear_dialog()
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return EncodeBase58Check(xpub)
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def decrypt_message(self, pubkey, message, password):
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self.give_error("Not supported")
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def sign_message(self, address, message, password):
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use2FA = False
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self.signing = True
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# prompt for the PIN before displaying the dialog if necessary
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client = self.get_client()
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if not self.check_proper_device():
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self.give_error('Wrong device or password')
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address_path = self.address_id(address)
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self.handler.show_message("Signing message ...")
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try:
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info = self.get_client().signMessagePrepare(address_path, message)
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pin = ""
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if info['confirmationNeeded']:
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# TODO : handle different confirmation types. For the time being only supports keyboard 2FA
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use2FA = True
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confirmed, p, pin = self.password_dialog()
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if not confirmed:
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raise Exception('Aborted by user')
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pin = pin.encode()
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client.bad = True
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self.device_checked = False
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self.plugin.get_client(self, True, True)
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signature = self.get_client().signMessageSign(pin)
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except BTChipException, e:
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if e.sw == 0x6a80:
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self.give_error("Unfortunately, this message cannot be signed by the Ledger wallet. Only alphanumerical messages shorter than 140 characters are supported. Please remove any extra characters (tab, carriage return) and retry.")
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else:
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self.give_error(e, True)
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except Exception, e:
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self.give_error(e, True)
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finally:
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self.handler.clear_dialog()
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client.bad = use2FA
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self.signing = False
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# Parse the ASN.1 signature
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rLength = signature[3]
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r = signature[4 : 4 + rLength]
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sLength = signature[4 + rLength + 1]
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s = signature[4 + rLength + 2:]
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if rLength == 33:
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r = r[1:]
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if sLength == 33:
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s = s[1:]
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r = str(r)
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s = str(s)
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# And convert it
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return chr(27 + 4 + (signature[0] & 0x01)) + r + s
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def sign_transaction(self, tx, password):
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if tx.is_complete():
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return
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client = self.get_client()
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self.signing = True
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inputs = []
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inputsPaths = []
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pubKeys = []
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trustedInputs = []
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redeemScripts = []
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signatures = []
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preparedTrustedInputs = []
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changePath = ""
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changeAmount = None
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output = None
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outputAmount = None
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use2FA = False
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pin = ""
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rawTx = tx.serialize()
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# Fetch inputs of the transaction to sign
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for txinput in tx.inputs():
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if ('is_coinbase' in txinput and txinput['is_coinbase']):
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self.give_error("Coinbase not supported") # should never happen
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inputs.append([ self.transactions[txinput['prevout_hash']].raw,
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txinput['prevout_n'] ])
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address = txinput['address']
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inputsPaths.append(self.address_id(address))
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pubKeys.append(self.get_public_keys(address))
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# Recognize outputs - only one output and one change is authorized
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if len(tx.outputs()) > 2: # should never happen
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self.give_error("Transaction with more than 2 outputs not supported")
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for type, address, amount in tx.outputs():
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assert type == TYPE_ADDRESS
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if self.is_change(address):
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changePath = self.address_id(address)
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changeAmount = amount
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else:
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if output <> None: # should never happen
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self.give_error("Multiple outputs with no change not supported")
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output = address
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outputAmount = amount
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self.get_client() # prompt for the PIN before displaying the dialog if necessary
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if not self.check_proper_device():
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self.give_error('Wrong device or password')
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self.handler.show_message("Signing Transaction ...")
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try:
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# Get trusted inputs from the original transactions
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for utxo in inputs:
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txtmp = bitcoinTransaction(bytearray(utxo[0].decode('hex')))
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trustedInputs.append(self.get_client().getTrustedInput(txtmp, utxo[1]))
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# TODO : Support P2SH later
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redeemScripts.append(txtmp.outputs[utxo[1]].script)
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# Sign all inputs
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firstTransaction = True
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inputIndex = 0
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while inputIndex < len(inputs):
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self.get_client().startUntrustedTransaction(firstTransaction, inputIndex,
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trustedInputs, redeemScripts[inputIndex])
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outputData = self.get_client().finalizeInput(output, format_satoshis_plain(outputAmount),
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format_satoshis_plain(self.get_tx_fee(tx)), changePath, bytearray(rawTx.decode('hex')))
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if firstTransaction:
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transactionOutput = outputData['outputData']
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if outputData['confirmationNeeded']:
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# TODO : handle different confirmation types. For the time being only supports keyboard 2FA
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self.handler.clear_dialog()
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if 'keycardData' in outputData:
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pin2 = ""
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for keycardIndex in range(len(outputData['keycardData'])):
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msg = "Do not enter your device PIN here !\r\n\r\n" + \
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"Your Ledger Wallet wants to talk to you and tell you a unique second factor code.\r\n" + \
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"For this to work, please match the character between stars of the output address using your security card\r\n\r\n" + \
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"Output address : "
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for index in range(len(output)):
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if index == outputData['keycardData'][keycardIndex]:
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msg = msg + "*" + output[index] + "*"
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else:
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msg = msg + output[index]
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msg = msg + "\r\n"
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confirmed, p, pin = self.password_dialog(msg)
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if not confirmed:
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raise Exception('Aborted by user')
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try:
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pin2 = pin2 + chr(int(pin[0], 16))
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except:
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raise Exception('Invalid PIN character')
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pin = pin2
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else:
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use2FA = True
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confirmed, p, pin = self.password_dialog()
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if not confirmed:
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raise Exception('Aborted by user')
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pin = pin.encode()
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client.bad = True
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self.device_checked = False
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self.plugin.get_client(self, True, True)
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self.handler.show_message("Signing ...")
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else:
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# Sign input with the provided PIN
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inputSignature = self.get_client().untrustedHashSign(inputsPaths[inputIndex],
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pin)
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inputSignature[0] = 0x30 # force for 1.4.9+
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signatures.append(inputSignature)
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inputIndex = inputIndex + 1
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firstTransaction = False
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except Exception, e:
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self.give_error(e, True)
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finally:
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self.handler.clear_dialog()
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# Reformat transaction
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inputIndex = 0
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while inputIndex < len(inputs):
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# TODO : Support P2SH later
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inputScript = get_regular_input_script(signatures[inputIndex], pubKeys[inputIndex][0].decode('hex'))
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preparedTrustedInputs.append([ trustedInputs[inputIndex]['value'], inputScript ])
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inputIndex = inputIndex + 1
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updatedTransaction = format_transaction(transactionOutput, preparedTrustedInputs)
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updatedTransaction = hexlify(updatedTransaction)
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tx.update(updatedTransaction)
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client.bad = use2FA
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self.signing = False
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def check_proper_device(self):
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pubKey = DecodeBase58Check(self.master_public_keys["x/0'"])[45:]
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if not self.device_checked:
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self.handler.show_message("Checking device")
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try:
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nodeData = self.get_client().getWalletPublicKey("44'/0'/0'")
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except Exception, e:
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self.give_error(e, True)
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finally:
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self.handler.clear_dialog()
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pubKeyDevice = compress_public_key(nodeData['publicKey'])
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self.device_checked = True
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if pubKey != pubKeyDevice:
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self.proper_device = False
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else:
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self.proper_device = True
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return self.proper_device
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def password_dialog(self, msg=None):
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if not msg:
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msg = _("Do not enter your device PIN here !\r\n\r\n" \
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"Your Ledger Wallet wants to talk to you and tell you a unique second factor code.\r\n" \
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"For this to work, please open a text editor " \
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"(on a different computer / device if you believe this computer is compromised) " \
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"and put your cursor into it, unplug your Ledger Wallet and plug it back in.\r\n" \
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"It should show itself to your computer as a keyboard " \
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"and output the second factor along with a summary of " \
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"the transaction being signed into the text-editor.\r\n\r\n" \
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"Check that summary and then enter the second factor code here.\r\n" \
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"Before clicking OK, re-plug the device once more (unplug it and plug it again if you read the second factor code on the same computer)")
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response = self.handler.get_word(msg)
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if response is None:
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return False, None, None
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return True, response, response
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class LedgerPlugin(HW_PluginBase):
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libraries_available = BTCHIP
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wallet_class = BTChipWallet
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def __init__(self, parent, config, name):
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HW_PluginBase.__init__(self, parent, config, name)
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# FIXME shouldn't be a plugin member. Then this constructor can go.
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self.client = None
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def btchip_is_connected(self, wallet):
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try:
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wallet.get_client().getFirmwareVersion()
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except:
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return False
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return True
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def get_client(self, wallet, force_pair=True, noPin=False):
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aborted = False
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client = self.client
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if not client or client.bad:
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try:
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d = getDongle(BTCHIP_DEBUG)
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client = btchip(d)
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firmware = client.getFirmwareVersion()['version'].split(".")
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if not checkFirmware(firmware):
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d.close()
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try:
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updateFirmware()
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except Exception, e:
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aborted = True
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raise e
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d = getDongle(BTCHIP_DEBUG)
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client = btchip(d)
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try:
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client.getOperationMode()
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except BTChipException, e:
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if (e.sw == 0x6985):
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d.close()
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dialog = StartBTChipPersoDialog()
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dialog.exec_()
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# Then fetch the reference again as it was invalidated
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d = getDongle(BTCHIP_DEBUG)
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client = btchip(d)
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else:
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raise e
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if not noPin:
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# Immediately prompts for the PIN
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remaining_attempts = client.getVerifyPinRemainingAttempts()
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if remaining_attempts <> 1:
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msg = "Enter your Ledger PIN - remaining attempts : " + str(remaining_attempts)
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else:
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msg = "Enter your Ledger PIN - WARNING : LAST ATTEMPT. If the PIN is not correct, the dongle will be wiped."
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confirmed, p, pin = wallet.password_dialog(msg)
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if not confirmed:
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aborted = True
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raise Exception('Aborted by user - please unplug the dongle and plug it again before retrying')
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pin = pin.encode()
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client.verifyPin(pin)
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except BTChipException, e:
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try:
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client.dongle.close()
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except:
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pass
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client = None
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if (e.sw == 0x6faa):
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raise Exception("Dongle is temporarily locked - please unplug it and replug it again")
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if ((e.sw & 0xFFF0) == 0x63c0):
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raise Exception("Invalid PIN - please unplug the dongle and plug it again before retrying")
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raise e
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except Exception, e:
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try:
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client.dongle.close()
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except:
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pass
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client = None
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if not aborted:
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raise Exception("Could not connect to your Ledger wallet. Please verify access permissions, PIN, or unplug the dongle and plug it again")
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else:
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raise e
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client.bad = False
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wallet.device_checked = False
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wallet.proper_device = False
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self.client = client
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return self.client
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