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409 lines
15 KiB
409 lines
15 KiB
#!/usr/bin/env python |
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# |
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# Electrum - Lightweight Bitcoin Client |
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# Copyright (C) 2015 Thomas Voegtlin |
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# |
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# This program is free software: you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation, either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program. If not, see <http://www.gnu.org/licenses/>. |
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import socket |
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import os |
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import re |
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import requests |
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import json |
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from hashlib import sha256 |
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from urlparse import urljoin |
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from urllib import quote |
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import electrum |
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from electrum import bitcoin |
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from electrum.bitcoin import * |
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from electrum.mnemonic import Mnemonic |
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from electrum import version |
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from electrum.wallet import Multisig_Wallet, BIP32_Wallet |
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from electrum.i18n import _ |
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from electrum.plugins import BasePlugin, run_hook, hook |
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from electrum.util import NotEnoughFunds |
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from decimal import Decimal |
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# signing_xpub is hardcoded so that the wallet can be restored from seed, without TrustedCoin's server |
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signing_xpub = "xpub661MyMwAqRbcGnMkaTx2594P9EDuiEqMq25PM2aeG6UmwzaohgA6uDmNsvSUV8ubqwA3Wpste1hg69XHgjUuCD5HLcEp2QPzyV1HMrPppsL" |
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billing_xpub = "xpub6DTBdtBB8qUmH5c77v8qVGVoYk7WjJNpGvutqjLasNG1mbux6KsojaLrYf2sRhXAVU4NaFuHhbD9SvVPRt1MB1MaMooRuhHcAZH1yhQ1qDU" |
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SEED_PREFIX = version.SEED_PREFIX_2FA |
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DISCLAIMER = [ |
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_("Two-factor authentication is a service provided by TrustedCoin. " |
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"It uses a multi-signature wallet, where you own 2 of 3 keys. " |
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"The third key is stored on a remote server that signs transactions on " |
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"your behalf. To use this service, you will need a smartphone with " |
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"Google Authenticator installed."), |
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_("A small fee will be charged on each transaction that uses the " |
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"remote server. You may check and modify your billing preferences " |
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"once the installation is complete."), |
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_("Note that your coins are not locked in this service. You may withdraw " |
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"your funds at any time and at no cost, without the remote server, by " |
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"using the 'restore wallet' option with your wallet seed."), |
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_("The next step will generate the seed of your wallet. This seed will " |
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"NOT be saved in your computer, and it must be stored on paper. " |
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"To be safe from malware, you may want to do this on an offline " |
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"computer, and move your wallet later to an online computer."), |
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] |
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RESTORE_MSG = _("Enter the seed for your 2-factor wallet:") |
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class TrustedCoinException(Exception): |
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def __init__(self, message, status_code=0): |
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Exception.__init__(self, message) |
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self.status_code = status_code |
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class TrustedCoinCosignerClient(object): |
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def __init__(self, user_agent=None, base_url='https://api.trustedcoin.com/2/', debug=False): |
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self.base_url = base_url |
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self.debug = debug |
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self.user_agent = user_agent |
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def send_request(self, method, relative_url, data=None): |
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kwargs = {'headers': {}} |
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if self.user_agent: |
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kwargs['headers']['user-agent'] = self.user_agent |
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if method == 'get' and data: |
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kwargs['params'] = data |
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elif method == 'post' and data: |
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kwargs['data'] = json.dumps(data) |
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kwargs['headers']['content-type'] = 'application/json' |
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url = urljoin(self.base_url, relative_url) |
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if self.debug: |
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print '%s %s %s' % (method, url, data) |
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response = requests.request(method, url, **kwargs) |
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if self.debug: |
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print response.text |
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print |
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if response.status_code != 200: |
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message = str(response.text) |
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if response.headers.get('content-type') == 'application/json': |
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r = response.json() |
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if 'message' in r: |
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message = r['message'] |
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raise TrustedCoinException(message, response.status_code) |
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if response.headers.get('content-type') == 'application/json': |
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return response.json() |
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else: |
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return response.text |
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def get_terms_of_service(self, billing_plan='electrum-per-tx-otp'): |
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""" |
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Returns the TOS for the given billing plan as a plain/text unicode string. |
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:param billing_plan: the plan to return the terms for |
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""" |
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payload = {'billing_plan': billing_plan} |
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return self.send_request('get', 'tos', payload) |
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def create(self, xpubkey1, xpubkey2, email, billing_plan='electrum-per-tx-otp'): |
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""" |
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Creates a new cosigner resource. |
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:param xpubkey1: a bip32 extended public key (customarily the hot key) |
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:param xpubkey2: a bip32 extended public key (customarily the cold key) |
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:param email: a contact email |
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:param billing_plan: the billing plan for the cosigner |
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""" |
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payload = { |
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'email': email, |
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'xpubkey1': xpubkey1, |
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'xpubkey2': xpubkey2, |
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'billing_plan': billing_plan, |
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} |
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return self.send_request('post', 'cosigner', payload) |
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def auth(self, id, otp): |
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""" |
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Attempt to authenticate for a particular cosigner. |
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:param id: the id of the cosigner |
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:param otp: the one time password |
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""" |
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payload = {'otp': otp} |
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return self.send_request('post', 'cosigner/%s/auth' % quote(id), payload) |
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def get(self, id): |
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""" |
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Attempt to authenticate for a particular cosigner. |
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:param id: the id of the cosigner |
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:param otp: the one time password |
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""" |
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return self.send_request('get', 'cosigner/%s' % quote(id)) |
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def sign(self, id, transaction, otp): |
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""" |
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Attempt to authenticate for a particular cosigner. |
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:param id: the id of the cosigner |
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:param transaction: the hex encoded [partially signed] compact transaction to sign |
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:param otp: the one time password |
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""" |
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payload = { |
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'otp': otp, |
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'transaction': transaction |
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} |
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return self.send_request('post', 'cosigner/%s/sign' % quote(id), payload) |
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def transfer_credit(self, id, recipient, otp, signature_callback): |
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""" |
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Tranfer a cosigner's credits to another cosigner. |
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:param id: the id of the sending cosigner |
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:param recipient: the id of the recipient cosigner |
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:param otp: the one time password (of the sender) |
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:param signature_callback: a callback that signs a text message using xpubkey1/0/0 returning a compact sig |
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""" |
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payload = { |
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'otp': otp, |
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'recipient': recipient, |
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'timestamp': int(time.time()), |
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} |
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relative_url = 'cosigner/%s/transfer' % quote(id) |
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full_url = urljoin(self.base_url, relative_url) |
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headers = { |
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'x-signature': signature_callback(full_url + '\n' + json.dumps(payload)) |
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} |
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return self.send_request('post', relative_url, payload, headers) |
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server = TrustedCoinCosignerClient(user_agent="Electrum/" + version.ELECTRUM_VERSION) |
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class Wallet_2fa(Multisig_Wallet): |
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def __init__(self, storage): |
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BIP32_Wallet.__init__(self, storage) |
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self.wallet_type = '2fa' |
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self.m = 2 |
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self.n = 3 |
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self.is_billing = False |
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self.billing_info = None |
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def get_action(self): |
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xpub1 = self.master_public_keys.get("x1/") |
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xpub2 = self.master_public_keys.get("x2/") |
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xpub3 = self.master_public_keys.get("x3/") |
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if xpub2 is None and not self.storage.get('use_trustedcoin'): |
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return 'show_disclaimer' |
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if xpub2 is None: |
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return 'create_extended_seed' |
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if xpub3 is None: |
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return 'create_remote_key' |
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def make_seed(self): |
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return Mnemonic('english').make_seed(num_bits=256, prefix=SEED_PREFIX) |
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def can_sign_without_server(self): |
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return self.master_private_keys.get('x2/') is not None |
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def extra_fee(self): |
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if self.can_sign_without_server(): |
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return 0 |
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if self.billing_info.get('tx_remaining'): |
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return 0 |
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if self.is_billing: |
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return 0 |
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price = int(self.price_per_tx.get(1)) |
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assert price <= 100000 |
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return price |
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def make_unsigned_transaction(self, coins, outputs, config, |
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fixed_fee=None, change_addr=None): |
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mk_tx = lambda o: BIP32_Wallet.make_unsigned_transaction( |
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self, coins, o, config, fixed_fee, change_addr) |
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fee = self.extra_fee() |
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if fee: |
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address = self.billing_info['billing_address'] |
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fee_output = (TYPE_ADDRESS, address, fee) |
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try: |
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tx = mk_tx(outputs + [fee_output]) |
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except NotEnoughFunds: |
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# trustedcoin won't charge if the total inputs is |
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# lower than their fee |
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tx = mk_tx(outputs) |
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if tx.input_value() >= fee: |
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raise |
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self.print_error("not charging for this tx") |
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else: |
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tx = mk_tx(outputs) |
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return tx |
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def sign_transaction(self, tx, password): |
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BIP32_Wallet.sign_transaction(self, tx, password) |
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if tx.is_complete(): |
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return |
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if not self.auth_code: |
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self.print_error("sign_transaction: no auth code") |
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return |
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long_user_id, short_id = self.get_user_id() |
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tx_dict = tx.as_dict() |
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raw_tx = tx_dict["hex"] |
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r = server.sign(short_id, raw_tx, self.auth_code) |
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if r: |
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raw_tx = r.get('transaction') |
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tx.update(raw_tx) |
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self.print_error("twofactor: is complete", tx.is_complete()) |
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def get_user_id(self): |
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def make_long_id(xpub_hot, xpub_cold): |
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return bitcoin.sha256(''.join(sorted([xpub_hot, xpub_cold]))) |
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xpub_hot = self.master_public_keys["x1/"] |
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xpub_cold = self.master_public_keys["x2/"] |
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long_id = make_long_id(xpub_hot, xpub_cold) |
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short_id = hashlib.sha256(long_id).hexdigest() |
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return long_id, short_id |
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# Utility functions |
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def make_xpub(xpub, s): |
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_, _, _, c, cK = deserialize_xkey(xpub) |
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cK2, c2 = bitcoin._CKD_pub(cK, c, s) |
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xpub2 = ("0488B21E" + "00" + "00000000" + "00000000").decode("hex") + c2 + cK2 |
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return EncodeBase58Check(xpub2) |
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def restore_third_key(wallet): |
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long_user_id, short_id = wallet.get_user_id() |
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xpub3 = make_xpub(signing_xpub, long_user_id) |
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wallet.add_master_public_key('x3/', xpub3) |
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def make_billing_address(wallet, num): |
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long_id, short_id = wallet.get_user_id() |
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xpub = make_xpub(billing_xpub, long_id) |
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_, _, _, c, cK = deserialize_xkey(xpub) |
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cK, c = bitcoin.CKD_pub(cK, c, num) |
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address = public_key_to_bc_address( cK ) |
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return address |
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class TrustedCoinPlugin(BasePlugin): |
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wallet_class = Wallet_2fa |
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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.wallet_class.plugin = self |
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@staticmethod |
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def is_valid_seed(seed): |
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return bitcoin.is_new_seed(seed, SEED_PREFIX) |
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def is_available(self): |
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return True |
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def set_enabled(self, wallet, enabled): |
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wallet.storage.put('use_' + self.name, enabled) |
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def is_enabled(self): |
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return True |
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@hook |
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def get_additional_fee(self, wallet, tx): |
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address = wallet.billing_info['billing_address'] |
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for _type, addr, amount in tx.outputs(): |
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if _type == TYPE_ADDRESS and addr == address: |
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return amount |
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def request_billing_info(self, wallet): |
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billing_info = server.get(wallet.get_user_id()[1]) |
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billing_address = make_billing_address(wallet, billing_info['billing_index']) |
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assert billing_address == billing_info['billing_address'] |
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wallet.billing_info = billing_info |
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wallet.price_per_tx = dict(billing_info['price_per_tx']) |
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return True |
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def create_extended_seed(self, wallet, window): |
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seed = wallet.make_seed() |
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window.show_and_verify_seed(seed, is_valid=self.is_valid_seed) |
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password = window.request_password() |
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wallet.storage.put('seed_version', wallet.seed_version) |
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wallet.storage.put('use_encryption', password is not None) |
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words = seed.split() |
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n = len(words)/2 |
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wallet.add_xprv_from_seed(' '.join(words[0:n]), 'x1/', password) |
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wallet.add_xpub_from_seed(' '.join(words[n:]), 'x2/') |
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wallet.storage.write() |
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msg = [ |
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_("Your wallet file is: %s.")%os.path.abspath(wallet.storage.path), |
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_("You need to be online in order to complete the creation of " |
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"your wallet. If you generated your seed on an offline " |
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'computer, click on "%s" to close this window, move your ' |
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"wallet file to an online computer, and reopen it with " |
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"Electrum.") % _('Cancel'), |
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_('If you are online, click on "%s" to continue.') % _('Next') |
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] |
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msg = '\n\n'.join(msg) |
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self.confirm(window, msg) |
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@hook |
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def do_clear(self, window): |
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window.wallet.is_billing = False |
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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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seed = wizard.request_seed(RESTORE_MSG, is_valid=self.is_valid_seed) |
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password = wizard.request_password() |
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wallet.add_seed(seed, password) |
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words = seed.split() |
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n = len(words)/2 |
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wallet.add_xprv_from_seed(' '.join(words[0:n]), 'x1/', password) |
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wallet.add_xpub_from_seed(' '.join(words[n:]), 'x2/') |
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restore_third_key(wallet) |
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wallet.create_main_account() |
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return wallet |
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def create_remote_key(self, wallet, window): |
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email = self.accept_terms_of_use(window) |
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xpub_hot = wallet.master_public_keys["x1/"] |
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xpub_cold = wallet.master_public_keys["x2/"] |
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# Generate third key deterministically. |
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long_user_id, short_id = wallet.get_user_id() |
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xpub3 = make_xpub(signing_xpub, long_user_id) |
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# secret must be sent by the server |
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try: |
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r = server.create(xpub_hot, xpub_cold, email) |
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except socket.error: |
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window.show_message('Server not reachable, aborting') |
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return |
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except TrustedCoinException as e: |
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if e.status_code == 409: |
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r = None |
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else: |
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raise e |
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if r is None: |
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otp_secret = None |
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else: |
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otp_secret = r.get('otp_secret') |
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if not otp_secret: |
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window.show_message(_('Error')) |
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return |
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_xpub3 = r['xpubkey_cosigner'] |
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_id = r['id'] |
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try: |
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assert _id == short_id, ("user id error", _id, short_id) |
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assert xpub3 == _xpub3, ("xpub3 error", xpub3, _xpub3) |
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except Exception as e: |
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window.show_message(str(e)) |
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return |
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if self.setup_google_auth(window, short_id, otp_secret): |
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wallet.add_master_public_key('x3/', xpub3) |
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wallet.create_main_account()
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