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#!/usr/bin/env python
#
# Electrum - Lightweight Bitcoin Client
# Copyright (C) 2015 Thomas Voegtlin
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import threading
import socket
import os
import re
import requests
import json
from hashlib import sha256
from urlparse import urljoin
from urllib import quote
from PyQt4.QtGui import *
from PyQt4.QtCore import *
import electrum
from electrum import bitcoin
from electrum.bitcoin import *
from electrum.mnemonic import Mnemonic
from electrum import version
from electrum.wallet import Multisig_Wallet, BIP32_Wallet
from electrum.i18n import _
from electrum.plugins import BasePlugin, run_hook, hook
from electrum_gui.qt.util import *
from electrum_gui.qt.qrcodewidget import QRCodeWidget
from electrum_gui.qt.amountedit import AmountEdit
from electrum_gui.qt.main_window import StatusBarButton
from decimal import Decimal
# signing_xpub is hardcoded so that the wallet can be restored from seed, without TrustedCoin's server
signing_xpub = "xpub661MyMwAqRbcGnMkaTx2594P9EDuiEqMq25PM2aeG6UmwzaohgA6uDmNsvSUV8ubqwA3Wpste1hg69XHgjUuCD5HLcEp2QPzyV1HMrPppsL"
billing_xpub = "xpub6DTBdtBB8qUmH5c77v8qVGVoYk7WjJNpGvutqjLasNG1mbux6KsojaLrYf2sRhXAVU4NaFuHhbD9SvVPRt1MB1MaMooRuhHcAZH1yhQ1qDU"
SEED_PREFIX = version.SEED_PREFIX_2FA
class TrustedCoinException(Exception):
def __init__(self, message, status_code=0):
Exception.__init__(self, message)
self.status_code = status_code
class TrustedCoinCosignerClient(object):
def __init__(self, user_agent=None, base_url='https://api.trustedcoin.com/2/', debug=False):
self.base_url = base_url
self.debug = debug
self.user_agent = user_agent
def send_request(self, method, relative_url, data=None):
kwargs = {'headers': {}}
if self.user_agent:
kwargs['headers']['user-agent'] = self.user_agent
if method == 'get' and data:
kwargs['params'] = data
elif method == 'post' and data:
kwargs['data'] = json.dumps(data)
kwargs['headers']['content-type'] = 'application/json'
url = urljoin(self.base_url, relative_url)
if self.debug:
print '%s %s %s' % (method, url, data)
response = requests.request(method, url, **kwargs)
if self.debug:
print response.text
print
if response.status_code != 200:
message = str(response.text)
if response.headers.get('content-type') == 'application/json':
r = response.json()
if 'message' in r:
message = r['message']
raise TrustedCoinException(message, response.status_code)
if response.headers.get('content-type') == 'application/json':
return response.json()
else:
return response.text
def get_terms_of_service(self, billing_plan='electrum-per-tx-otp'):
"""
Returns the TOS for the given billing plan as a plain/text unicode string.
:param billing_plan: the plan to return the terms for
"""
payload = {'billing_plan': billing_plan}
return self.send_request('get', 'tos', payload)
def create(self, xpubkey1, xpubkey2, email, billing_plan='electrum-per-tx-otp'):
"""
Creates a new cosigner resource.
:param xpubkey1: a bip32 extended public key (customarily the hot key)
:param xpubkey2: a bip32 extended public key (customarily the cold key)
:param email: a contact email
:param billing_plan: the billing plan for the cosigner
"""
payload = {
'email': email,
'xpubkey1': xpubkey1,
'xpubkey2': xpubkey2,
'billing_plan': billing_plan,
}
return self.send_request('post', 'cosigner', payload)
def auth(self, id, otp):
"""
Attempt to authenticate for a particular cosigner.
:param id: the id of the cosigner
:param otp: the one time password
"""
payload = {'otp': otp}
return self.send_request('post', 'cosigner/%s/auth' % quote(id), payload)
def get(self, id):
"""
Attempt to authenticate for a particular cosigner.
:param id: the id of the cosigner
:param otp: the one time password
"""
return self.send_request('get', 'cosigner/%s' % quote(id))
def sign(self, id, transaction, otp):
"""
Attempt to authenticate for a particular cosigner.
:param id: the id of the cosigner
:param transaction: the hex encoded [partially signed] compact transaction to sign
:param otp: the one time password
"""
payload = {
'otp': otp,
'transaction': transaction
}
return self.send_request('post', 'cosigner/%s/sign' % quote(id), payload)
def transfer_credit(self, id, recipient, otp, signature_callback):
"""
Tranfer a cosigner's credits to another cosigner.
:param id: the id of the sending cosigner
:param recipient: the id of the recipient cosigner
:param otp: the one time password (of the sender)
:param signature_callback: a callback that signs a text message using xpubkey1/0/0 returning a compact sig
"""
payload = {
'otp': otp,
'recipient': recipient,
'timestamp': int(time.time()),
}
relative_url = 'cosigner/%s/transfer' % quote(id)
full_url = urljoin(self.base_url, relative_url)
headers = {
'x-signature': signature_callback(full_url + '\n' + json.dumps(payload))
}
return self.send_request('post', relative_url, payload, headers)
server = TrustedCoinCosignerClient(user_agent="Electrum/" + version.ELECTRUM_VERSION)
class Wallet_2fa(Multisig_Wallet):
def __init__(self, storage):
BIP32_Wallet.__init__(self, storage)
self.wallet_type = '2fa'
self.m = 2
self.n = 3
def get_action(self):
xpub1 = self.master_public_keys.get("x1/")
xpub2 = self.master_public_keys.get("x2/")
xpub3 = self.master_public_keys.get("x3/")
if xpub2 is None and not self.storage.get('use_trustedcoin'):
return 'show_disclaimer'
if xpub2 is None:
return 'create_extended_seed'
if xpub3 is None:
return 'create_remote_key'
if not self.accounts:
return 'create_accounts'
def make_seed(self):
return Mnemonic('english').make_seed(num_bits=256, prefix=SEED_PREFIX)
def estimated_fee(self, tx, fee_per_kb):
fee = Multisig_Wallet.estimated_fee(self, tx, fee_per_kb)
x = run_hook('extra_fee', tx)
if x: fee += x
return fee
def get_tx_fee(self, tx):
fee = Multisig_Wallet.get_tx_fee(self, tx)
x = run_hook('extra_fee', tx)
if x: fee += x
return fee
class Plugin(BasePlugin):
wallet = None
def __init__(self, x, y):
BasePlugin.__init__(self, x, y)
self.seed_func = lambda x: bitcoin.is_new_seed(x, SEED_PREFIX)
self.billing_info = None
self.is_billing = False
def constructor(self, s):
return Wallet_2fa(s)
def is_available(self):
if not self.wallet:
return False
if self.wallet.storage.get('wallet_type') == '2fa':
return True
return False
def set_enabled(self, enabled):
self.wallet.storage.put('use_' + self.name, enabled)
def is_enabled(self):
if not self.is_available():
return False
if self.wallet.master_private_keys.get('x2/'):
return False
return True
def make_long_id(self, xpub_hot, xpub_cold):
return bitcoin.sha256(''.join(sorted([xpub_hot, xpub_cold])))
def get_user_id(self):
xpub_hot = self.wallet.master_public_keys["x1/"]
xpub_cold = self.wallet.master_public_keys["x2/"]
long_id = self.make_long_id(xpub_hot, xpub_cold)
short_id = hashlib.sha256(long_id).hexdigest()
return long_id, short_id
def make_xpub(self, xpub, s):
_, _, _, c, cK = deserialize_xkey(xpub)
cK2, c2 = bitcoin._CKD_pub(cK, c, s)
xpub2 = ("0488B21E" + "00" + "00000000" + "00000000").decode("hex") + c2 + cK2
return EncodeBase58Check(xpub2)
def make_billing_address(self, num):
long_id, short_id = self.get_user_id()
xpub = self.make_xpub(billing_xpub, long_id)
_, _, _, c, cK = deserialize_xkey(xpub)
cK, c = bitcoin.CKD_pub(cK, c, num)
address = public_key_to_bc_address( cK )
return address
def create_extended_seed(self, wallet, window):
seed = wallet.make_seed()
if not window.show_seed(seed, None):
return
if not window.verify_seed(seed, None, self.seed_func):
return
password = window.password_dialog()
wallet.storage.put('seed_version', wallet.seed_version, True)
wallet.storage.put('use_encryption', password is not None, True)
words = seed.split()
n = len(words)/2
wallet.add_cosigner_seed(' '.join(words[0:n]), 'x1/', password)
wallet.add_cosigner_xpub(' '.join(words[n:]), 'x2/')
msg = [
_('Your wallet file is:') + " %s"%os.path.abspath(wallet.storage.path),
_('You need to be online in order to complete the creation of your wallet.'),
_('If you generated your seed on an offline computer, click on "%s" to close this window, move your wallet file to an online computer and reopen it with Electrum.') % _('Close'),
_('If you are online, click on "%s" to continue.') % _('Next')
]
return window.question('\n\n'.join(msg), no_label=_('Close'), yes_label=_('Next'))
def show_disclaimer(self, wallet, window):
msg = [
_("Two-factor authentication is a service provided by TrustedCoin.") + ' ',
_("It uses a multi-signature wallet, where you own 2 of 3 keys.") + ' ',
_("The third key is stored on a remote server that signs transactions on your behalf.") + ' ',
_("To use this service, you will need a smartphone with Google Authenticator.") + '\n\n',
_("A small fee will be charged on each transaction that uses the remote server.") + ' ',
_("You may check and modify your billing preferences once the installation is complete.") + '\n\n',
_("Note that your coins are not locked in this service.") + ' ',
_("You may withdraw your funds at any time and at no cost, without the remote server, by using the 'restore wallet' option with your wallet seed.") + '\n\n',
_('The next step will generate the seed of your wallet.') + ' ',
_('This seed will NOT be saved in your computer, and it must be stored on paper.') + ' ',
_('To be safe from malware, you may want to do this on an offline computer, and move your wallet later to an online computer.')
]
icon = QPixmap(':icons/trustedcoin.png')
if not window.question(''.join(msg), icon=icon):
return False
self.wallet = wallet
self.set_enabled(True)
return True
def restore_third_key(self, wallet):
long_user_id, short_id = self.get_user_id()
xpub3 = self.make_xpub(signing_xpub, long_user_id)
wallet.add_master_public_key('x3/', xpub3)
@hook
def do_clear(self):
self.is_billing = False
@hook
def load_wallet(self, wallet, window):
self.wallet = wallet
self.window = window
self.trustedcoin_button = StatusBarButton(QIcon(":icons/trustedcoin.png"), _("TrustedCoin"), self.settings_dialog)
self.window.statusBar().addPermanentWidget(self.trustedcoin_button)
self.xpub = self.wallet.master_public_keys.get('x1/')
self.user_id = self.get_user_id()[1]
t = threading.Thread(target=self.request_billing_info)
t.setDaemon(True)
t.start()
@hook
def installwizard_load_wallet(self, wallet, window):
self.wallet = wallet
self.window = window
@hook
def close_wallet(self):
self.window.statusBar().removeWidget(self.trustedcoin_button)
@hook
def get_wizard_action(self, window, wallet, action):
if hasattr(self, action):
return getattr(self, action)
@hook
def installwizard_restore(self, window, storage):
if storage.get('wallet_type') != '2fa':
return
seed = window.enter_seed_dialog("Enter your seed", None, func=self.seed_func)
if not seed:
return
wallet = Wallet_2fa(storage)
self.wallet = wallet
password = window.password_dialog()
wallet.add_seed(seed, password)
words = seed.split()
n = len(words)/2
wallet.add_cosigner_seed(' '.join(words[0:n]), 'x1/', password)
wallet.add_cosigner_seed(' '.join(words[n:]), 'x2/', password)
self.restore_third_key(wallet)
wallet.create_main_account(password)
# disable plugin
self.set_enabled(False)
return wallet
def create_remote_key(self, wallet, window):
self.wallet = wallet
self.window = window
if wallet.storage.get('wallet_type') != '2fa':
raise
return
email = self.accept_terms_of_use(window)
if not email:
return
xpub_hot = wallet.master_public_keys["x1/"]
xpub_cold = wallet.master_public_keys["x2/"]
# Generate third key deterministically.
long_user_id, self.user_id = self.get_user_id()
xpub3 = self.make_xpub(signing_xpub, long_user_id)
# secret must be sent by the server
try:
r = server.create(xpub_hot, xpub_cold, email)
except socket.error:
self.window.show_message('Server not reachable, aborting')
return
except TrustedCoinException as e:
if e.status_code == 409:
r = None
else:
raise e
if r is None:
otp_secret = None
else:
otp_secret = r.get('otp_secret')
if not otp_secret:
self.window.show_message(_('Error'))
return
_xpub3 = r['xpubkey_cosigner']
_id = r['id']
try:
assert _id == self.user_id, ("user id error", _id, self.user_id)
assert xpub3 == _xpub3, ("xpub3 error", xpub3, _xpub3)
except Exception as e:
self.window.show_message(str(e))
return
if not self.setup_google_auth(self.window, self.user_id, otp_secret):
return
self.wallet.add_master_public_key('x3/', xpub3)
return True
def need_server(self, tx):
from electrum.account import BIP32_Account
# Detect if the server is needed
long_id, short_id = self.get_user_id()
xpub3 = self.wallet.master_public_keys['x3/']
for x in tx.inputs_to_sign():
if x[0:2] == 'ff':
xpub, sequence = BIP32_Account.parse_xpubkey(x)
if xpub == xpub3:
return True
return False
@hook
def sign_tx(self, tx):
self.print_error("twofactor:sign_tx")
if self.wallet.storage.get('wallet_type') != '2fa':
return
if not self.need_server(tx):
self.print_error("twofactor: xpub3 not needed")
self.auth_code = None
return
self.auth_code = self.auth_dialog()
@hook
def before_send(self):
# request billing info before forming the transaction
self.billing_info = None
self.waiting_dialog = WaitingDialog(self.window, 'please wait...', self.request_billing_info)
self.waiting_dialog.start()
self.waiting_dialog.wait()
if self.billing_info is None:
self.window.show_message('Could not contact server')
return True
return False
@hook
def extra_fee(self, tx):
if self.billing_info.get('tx_remaining'):
return 0
if self.is_billing:
return 0
# trustedcoin won't charge if the total inputs is lower than their fee
price = int(self.price_per_tx.get(1))
assert price <= 100000
if tx.input_value() < price:
self.print_error("not charging for this tx")
return 0
return price
@hook
def make_unsigned_transaction(self, tx):
price = self.extra_fee(tx)
if not price:
return
tx.outputs.append(('address', self.billing_info['billing_address'], price))
@hook
def sign_transaction(self, tx, password):
self.print_error("twofactor:sign")
if self.wallet.storage.get('wallet_type') != '2fa':
self.print_error("twofactor: aborting")
return
self.long_user_id, self.user_id = self.get_user_id()
if not self.auth_code:
return
if tx.is_complete():
return
tx_dict = tx.as_dict()
raw_tx = tx_dict["hex"]
try:
r = server.sign(self.user_id, raw_tx, self.auth_code)
except Exception as e:
tx.error = str(e)
return
self.print_error( "received answer", r)
if not r:
return
raw_tx = r.get('transaction')
tx.update(raw_tx)
self.print_error("twofactor: is complete", tx.is_complete())
def auth_dialog(self ):
d = QDialog(self.window)
d.setModal(1)
vbox = QVBoxLayout(d)
pw = AmountEdit(None, is_int = True)
msg = _('Please enter your Google Authenticator code')
vbox.addWidget(QLabel(msg))
grid = QGridLayout()
grid.setSpacing(8)
grid.addWidget(QLabel(_('Code')), 1, 0)
grid.addWidget(pw, 1, 1)
vbox.addLayout(grid)
vbox.addLayout(Buttons(CancelButton(d), OkButton(d)))
if not d.exec_():
return
return pw.get_amount()
def settings_dialog(self):
self.waiting_dialog = WaitingDialog(self.window, 'please wait...', self.request_billing_info, self.show_settings_dialog)
self.waiting_dialog.start()
def show_settings_dialog(self, success):
if not success:
self.window.show_message(_('Server not reachable.'))
return
d = QDialog(self.window)
d.setWindowTitle("TrustedCoin Information")
d.setMinimumSize(500, 200)
vbox = QVBoxLayout(d)
hbox = QHBoxLayout()
logo = QLabel()
logo.setPixmap(QPixmap(":icons/trustedcoin.png"))
msg = _('This wallet is protected by TrustedCoin\'s two-factor authentication.') + '<br/>'\
+ _("For more information, visit") + " <a href=\"https://api.trustedcoin.com/#/electrum-help\">https://api.trustedcoin.com/#/electrum-help</a>"
label = QLabel(msg)
label.setOpenExternalLinks(1)
hbox.addStretch(10)
hbox.addWidget(logo)
hbox.addStretch(10)
hbox.addWidget(label)
hbox.addStretch(10)
vbox.addLayout(hbox)
vbox.addStretch(10)
msg = _('TrustedCoin charges a fee per co-signed transaction. You may pay on each transaction (an extra output will be added to your transaction), or you may purchase prepaid transaction using this dialog.') + '<br/>'
label = QLabel(msg)
label.setWordWrap(1)
vbox.addWidget(label)
vbox.addStretch(10)
grid = QGridLayout()
vbox.addLayout(grid)
v = self.price_per_tx.get(1)
grid.addWidget(QLabel(_("Price per transaction (not prepaid):")), 0, 0)
grid.addWidget(QLabel(self.window.format_amount(v) + ' ' + self.window.base_unit()), 0, 1)
i = 1
if 10 not in self.price_per_tx:
self.price_per_tx[10] = 10 * self.price_per_tx.get(1)
for k, v in sorted(self.price_per_tx.items()):
if k == 1:
continue
grid.addWidget(QLabel("Price for %d prepaid transactions:"%k), i, 0)
grid.addWidget(QLabel("%d x "%k + self.window.format_amount(v/k) + ' ' + self.window.base_unit()), i, 1)
b = QPushButton(_("Buy"))
b.clicked.connect(lambda b, k=k, v=v: self.on_buy(k, v, d))
grid.addWidget(b, i, 2)
i += 1
n = self.billing_info.get('tx_remaining', 0)
grid.addWidget(QLabel(_("Your wallet has %d prepaid transactions.")%n), i, 0)
# tranfer button
#def on_transfer():
# server.transfer_credit(self.user_id, recipient, otp, signature_callback)
# pass
#b = QPushButton(_("Transfer"))
#b.clicked.connect(on_transfer)
#grid.addWidget(b, 1, 2)
#grid.addWidget(QLabel(_("Next Billing Address:")), i, 0)
#grid.addWidget(QLabel(self.billing_info['billing_address']), i, 1)
vbox.addLayout(Buttons(CloseButton(d)))
d.exec_()
def on_buy(self, k, v, d):
d.close()
if self.window.pluginsdialog:
self.window.pluginsdialog.close()
uri = "bitcoin:" + self.billing_info['billing_address'] + "?message=TrustedCoin %d Prepaid Transactions&amount="%k + str(Decimal(v)/100000000)
self.is_billing = True
self.window.pay_to_URI(uri)
self.window.payto_e.setFrozen(True)
self.window.message_e.setFrozen(True)
self.window.amount_e.setFrozen(True)
def request_billing_info(self):
billing_info = server.get(self.user_id)
billing_address = self.make_billing_address(billing_info['billing_index'])
assert billing_address == billing_info['billing_address']
self.billing_info = billing_info
self.price_per_tx = dict(self.billing_info['price_per_tx'])
return True
def accept_terms_of_use(self, window):
vbox = QVBoxLayout()
window.set_layout(vbox)
vbox.addWidget(QLabel(_("Terms of Service")))
tos_e = QTextEdit()
tos_e.setReadOnly(True)
vbox.addWidget(tos_e)
vbox.addWidget(QLabel(_("Please enter your e-mail address")))
email_e = QLineEdit()
vbox.addWidget(email_e)
vbox.addStretch()
accept_button = OkButton(window, _('Accept'))
accept_button.setEnabled(False)
vbox.addLayout(Buttons(CancelButton(window), accept_button))
def request_TOS():
tos = server.get_terms_of_service()
self.TOS = tos
window.emit(SIGNAL('twofactor:TOS'))
def on_result():
tos_e.setText(self.TOS)
window.connect(window, SIGNAL('twofactor:TOS'), on_result)
t = threading.Thread(target=request_TOS)
t.setDaemon(True)
t.start()
regexp = r"[^@]+@[^@]+\.[^@]+"
email_e.textChanged.connect(lambda: accept_button.setEnabled(re.match(regexp,email_e.text()) is not None))
email_e.setFocus(True)
if not window.exec_():
return
email = str(email_e.text())
return email
def setup_google_auth(self, window, _id, otp_secret):
vbox = QVBoxLayout()
window.set_layout(vbox)
if otp_secret is not None:
uri = "otpauth://totp/%s?secret=%s"%('trustedcoin.com', otp_secret)
vbox.addWidget(QLabel("Please scan this QR code in Google Authenticator."))
qrw = QRCodeWidget(uri)
vbox.addWidget(qrw, 1)
msg = _('Then, enter your Google Authenticator code:')
else:
label = QLabel("This wallet is already registered, but it was never authenticated. To finalize your registration, please enter your Google Authenticator Code. If you do not have this code, delete the wallet file and start a new registration")
label.setWordWrap(1)
vbox.addWidget(label)
msg = _('Google Authenticator code:')
hbox = QHBoxLayout()
hbox.addWidget(QLabel(msg))
pw = AmountEdit(None, is_int = True)
pw.setFocus(True)
hbox.addWidget(pw)
hbox.addStretch(1)
vbox.addLayout(hbox)
b = OkButton(window, _('Next'))
b.setEnabled(False)
vbox.addLayout(Buttons(CancelButton(window), b))
pw.textChanged.connect(lambda: b.setEnabled(len(pw.text())==6))
while True:
if not window.exec_():
return False
otp = pw.get_amount()
try:
server.auth(_id, otp)
return True
except:
QMessageBox.information(self.window, _('Message'), _('Incorrect password'), _('OK'))
pw.setText('')