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#!/usr/bin/env python
#
# Electrum - lightweight Bitcoin client
# Copyright (C) 2014 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 hashlib
import httplib
import os.path
import re
import sys
import threading
import time
import traceback
import urllib2
import urlparse
try:
import paymentrequest_pb2
except:
sys.exit("Error: could not find paymentrequest_pb2.py. Create it with 'protoc --proto_path=lib/ --python_out=lib/ lib/paymentrequest.proto'")
try:
import requests
except ImportError:
sys.exit("Error: requests does not seem to be installed. Try 'sudo pip install requests'")
import bitcoin
import util
import transaction
import x509
REQUEST_HEADERS = {'Accept': 'application/bitcoin-paymentrequest', 'User-Agent': 'Electrum'}
ACK_HEADERS = {'Content-Type':'application/bitcoin-payment','Accept':'application/bitcoin-paymentack','User-Agent':'Electrum'}
ca_list = {}
ca_path = requests.certs.where()
def load_certificates():
try:
ca_f = open(ca_path, 'r')
except Exception:
print "ERROR: Could not open %s"%ca_path
print "ca-bundle.crt file should be placed in ~/.electrum/ca/ca-bundle.crt"
print "Documentation on how to download or create the file here: http://curl.haxx.se/docs/caextract.html"
print "Payment will continue with manual verification."
return False
c = ""
for line in ca_f:
if line == "-----BEGIN CERTIFICATE-----\n":
c = line
else:
c += line
if line == "-----END CERTIFICATE-----\n":
x = x509.X509()
try:
x.parse(c)
except Exception as e:
util.print_error("cannot parse cert:", e)
continue
ca_list[x.getFingerprint()] = x
ca_f.close()
util.print_error("%d certificates"%len(ca_list))
return True
load_certificates()
class PaymentRequest:
def __init__(self, config):
self.config = config
self.outputs = []
self.error = ""
self.dir_path = os.path.join( self.config.path, 'requests')
if not os.path.exists(self.dir_path):
os.mkdir(self.dir_path)
def read(self, url):
self.url = url
u = urlparse.urlparse(url)
self.domain = u.netloc
try:
connection = httplib.HTTPConnection(u.netloc) if u.scheme == 'http' else httplib.HTTPSConnection(u.netloc)
connection.request("GET",u.geturl(), headers=REQUEST_HEADERS)
response = connection.getresponse()
except:
self.error = "cannot read url"
return
try:
r = response.read()
except:
self.error = "cannot read"
return
self.id = bitcoin.sha256(r)[0:16].encode('hex')
filename = os.path.join(self.dir_path, self.id)
with open(filename,'w') as f:
f.write(r)
return self.parse(r)
def get_status(self):
if self.error:
return self.error
else:
return self.status
def read_file(self, key):
filename = os.path.join(self.dir_path, key)
with open(filename,'r') as f:
r = f.read()
assert key == bitcoin.sha256(r)[0:16].encode('hex')
self.id = key
self.parse(r)
def parse(self, r):
try:
self.data = paymentrequest_pb2.PaymentRequest()
self.data.ParseFromString(r)
except:
self.error = "cannot parse payment request"
return
def verify(self):
if not ca_list:
self.error = "Trusted certificate authorities list not found"
return False
paymntreq = self.data
if not paymntreq.signature:
self.error = "No signature"
return
cert = paymentrequest_pb2.X509Certificates()
cert.ParseFromString(paymntreq.pki_data)
cert_num = len(cert.certificate)
x509_chain = []
for i in range(cert_num):
x = x509.X509()
x.parseBinary(bytearray(cert.certificate[i]))
x.slow_parse()
x509_chain.append(x)
if i == 0:
try:
x.check_date()
x.check_name(self.domain)
except Exception as e:
self.error = str(e)
return
else:
if not x.check_ca():
self.error = "ERROR: Supplied CA Certificate Error"
return
if not cert_num > 1:
self.error = "ERROR: CA Certificate Chain Not Provided by Payment Processor"
return False
for i in range(1, cert_num):
x = x509_chain[i]
prev_x = x509_chain[i-1]
algo, sig, data = prev_x.extract_sig()
sig = bytearray(sig[5:])
pubkey = x.publicKey
if algo.getComponentByName('algorithm') == x509.ALGO_RSA_SHA1:
verify = pubkey.hashAndVerify(sig, data)
elif algo.getComponentByName('algorithm') == x509.ALGO_RSA_SHA256:
hashBytes = bytearray(hashlib.sha256(data).digest())
prefixBytes = bytearray([0x30,0x31,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x01,0x05,0x00,0x04,0x20])
verify = pubkey.verify(sig, prefixBytes + hashBytes)
else:
self.error = "Algorithm not supported"
util.print_error(self.error, algo.getComponentByName('algorithm'))
return
if not verify:
self.error = "Certificate not Signed by Provided CA Certificate Chain"
return
ca = x509_chain[cert_num-1]
supplied_CA_fingerprint = ca.getFingerprint()
supplied_CA_names = ca.extract_names()
CA_OU = supplied_CA_names['OU']
x = ca_list.get(supplied_CA_fingerprint)
if x:
x.slow_parse()
names = x.extract_names()
CA_match = True
if names['CN'] != supplied_CA_names['CN']:
print "ERROR: Trusted CA CN Mismatch; however CA has trusted fingerprint"
print "Payment will continue with manual verification."
else:
CA_match = False
pubkey0 = x509_chain[0].publicKey
sig = paymntreq.signature
paymntreq.signature = ''
s = paymntreq.SerializeToString()
sigBytes = bytearray(sig)
msgBytes = bytearray(s)
if paymntreq.pki_type == "x509+sha256":
hashBytes = bytearray(hashlib.sha256(msgBytes).digest())
prefixBytes = bytearray([0x30,0x31,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x01,0x05,0x00,0x04,0x20])
verify = pubkey0.verify(sigBytes, prefixBytes + hashBytes)
elif paymntreq.pki_type == "x509+sha1":
verify = pubkey0.hashAndVerify(sigBytes, msgBytes)
else:
self.error = "ERROR: Unsupported PKI Type for Message Signature"
return False
if not verify:
self.error = "ERROR: Invalid Signature for Payment Request Data"
return False
### SIG Verified
self.details = pay_det = paymentrequest_pb2.PaymentDetails()
self.details.ParseFromString(paymntreq.serialized_payment_details)
for o in pay_det.outputs:
addr = transaction.get_address_from_output_script(o.script)[1]
self.outputs.append( ('address', addr, o.amount) )
self.memo = self.details.memo
if CA_match:
self.status = 'Signed by Trusted CA:\n' + CA_OU
else:
self.status = "Supplied CA Not Found in Trusted CA Store."
self.payment_url = self.details.payment_url
return True
def has_expired(self):
return self.details.expires and self.details.expires < int(time.time())
def get_expiration_date(self):
return self.details.expires
def get_amount(self):
return sum(map(lambda x:x[2], self.outputs))
def get_domain(self):
return self.domain
def get_memo(self):
return self.memo
def get_id(self):
return self.id
def get_outputs(self):
return self.outputs[:]
def send_ack(self, raw_tx, refund_addr):
pay_det = self.details
if not self.details.payment_url:
return False, "no url"
paymnt = paymentrequest_pb2.Payment()
paymnt.merchant_data = pay_det.merchant_data
paymnt.transactions.append(raw_tx)
ref_out = paymnt.refund_to.add()
ref_out.script = transaction.Transaction.pay_script('address', refund_addr)
paymnt.memo = "Paid using Electrum"
pm = paymnt.SerializeToString()
payurl = urlparse.urlparse(pay_det.payment_url)
try:
r = requests.post(payurl.geturl(), data=pm, headers=ACK_HEADERS, verify=ca_path)
except requests.exceptions.SSLError:
print "Payment Message/PaymentACK verify Failed"
try:
r = requests.post(payurl.geturl(), data=pm, headers=ACK_HEADERS, verify=False)
except Exception as e:
print e
return False, "Payment Message/PaymentACK Failed"
if r.status_code >= 500:
return False, r.reason
try:
paymntack = paymentrequest_pb2.PaymentACK()
paymntack.ParseFromString(r.content)
except Exception:
return False, "PaymentACK could not be processed. Payment was sent; please manually verify that payment was received."
print "PaymentACK message received: %s" % paymntack.memo
return True, paymntack.memo
if __name__ == "__main__":
util.set_verbosity(True)
load_certificates()
try:
uri = sys.argv[1]
except:
print "usage: %s url"%sys.argv[0]
print "example url: \"bitcoin:17KjQgnXC96jakzJe9yo8zxqerhqNptmhq?amount=0.0018&r=https%3A%2F%2Fbitpay.com%2Fi%2FMXc7qTM5f87EC62SWiS94z\""
sys.exit(1)
address, amount, label, message, request_url = util.parse_URI(uri)
from simple_config import SimpleConfig
config = SimpleConfig()
pr = PaymentRequest(config)
pr.read(request_url)
if not pr.verify():
print 'verify failed'
print pr.error
sys.exit(1)
print 'Payment Request Verified Domain: ', pr.domain
print 'outputs', pr.outputs
print 'Payment Memo: ', pr.details.memo
tx = "blah"
pr.send_ack(tx, refund_addr = "1vXAXUnGitimzinpXrqDWVU4tyAAQ34RA")