import hashlib
import httplib
import os.path
import re
import sys
import threading
import time
import traceback
import urllib2
try:
import paymentrequest_pb2
except:
print "protoc --proto_path=lib/ --python_out=lib/ lib/paymentrequest.proto"
raise Exception()
import urlparse
import requests
from M2Crypto import X509
from bitcoin import is_valid
import urlparse
import util
import transaction
REQUEST_HEADERS = {'Accept': 'application/bitcoin-paymentrequest', 'User-Agent': 'Electrum'}
ACK_HEADERS = {'Content-Type':'application/bitcoin-payment','Accept':'application/bitcoin-paymentack','User-Agent':'Electrum'}
ca_path = os.path.expanduser("~/.electrum/ca/ca-bundle.crt")
ca_list = {}
try:
with open(ca_path, 'r') as ca_f:
c = ""
for line in ca_f:
if line == "-----BEGIN CERTIFICATE-----\n":
c = line
else:
c += line
if line == "-----END CERTIFICATE-----\n":
x = X509.load_cert_string(c)
ca_list[x.get_fingerprint()] = x
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."
raise Exception()
class PaymentRequest:
def __init__(self, url):
self.url = url
self.outputs = []
def get_amount(self):
return sum(map(lambda x:x[1], self.outputs))
def verify(self):
u = urlparse.urlparse(self.url)
self.domain = u.netloc
connection = httplib.HTTPConnection(u.netloc) if u.scheme == 'http' else httplib.HTTPSConnection(u.netloc)
connection.request("GET",u.geturl(), headers=REQUEST_HEADERS)
resp = connection.getresponse()
r = resp.read()
paymntreq = paymentrequest_pb2.PaymentRequest()
paymntreq.ParseFromString(r)
sig = paymntreq.signature
if not sig:
print "No signature"
return
cert = paymentrequest_pb2.X509Certificates()
cert.ParseFromString(paymntreq.pki_data)
cert_num = len(cert.certificate)
x509_1 = X509.load_cert_der_string(cert.certificate[0])
if self.domain != x509_1.get_subject().CN:
validcert = False
try:
SANs = x509_1.get_ext("subjectAltName").get_value().split(",")
for s in SANs:
s = s.strip()
if s.startswith("DNS:") and s[4:] == self.domain:
validcert = True
print "Match SAN DNS"
elif s.startswith("IP:") and s[3:] == self.domain:
validcert = True
print "Match SAN IP"
elif s.startswith("email:") and s[6:] == self.domain:
validcert = True
print "Match SAN email"
except Exception, e:
print "ERROR: No SAN data"
if not validcert:
###TODO: check for wildcards
print "ERROR: Certificate Subject Domain Mismatch and SAN Mismatch"
print self.domain, x509_1.get_subject().CN
return
x509 = []
CA_OU = ''
if cert_num > 1:
for i in range(cert_num - 1):
x509.append(X509.load_cert_der_string(cert.certificate[i+1]))
if x509[i].check_ca() == 0:
print "ERROR: Supplied CA Certificate Error"
return
for i in range(cert_num - 1):
if i == 0:
if x509_1.verify(x509[i].get_pubkey()) != 1:
print "ERROR: Certificate not Signed by Provided CA Certificate Chain"
return
else:
if x509[i-1].verify(x509[i].get_pubkey()) != 1:
print "ERROR: CA Certificate not Signed by Provided CA Certificate Chain"
return
supplied_CA_fingerprint = x509[cert_num-2].get_fingerprint()
supplied_CA_CN = x509[cert_num-2].get_subject().CN
CA_match = False
x = ca_list.get(supplied_CA_fingerprint)
if x:
CA_OU = x.get_subject().OU
CA_match = True
if x.get_subject().CN != supplied_CA_CN:
print "ERROR: Trusted CA CN Mismatch; however CA has trusted fingerprint"
print "Payment will continue with manual verification."
else:
print "ERROR: Supplied CA Not Found in Trusted CA Store."
print "Payment will continue with manual verification."
else:
print "ERROR: CA Certificate Chain Not Provided by Payment Processor"
return False
paymntreq.signature = ''
s = paymntreq.SerializeToString()
pubkey_1 = x509_1.get_pubkey()
if paymntreq.pki_type == "x509+sha256":
pubkey_1.reset_context(md="sha256")
elif paymntreq.pki_type == "x509+sha1":
pubkey_1.reset_context(md="sha1")
else:
print "ERROR: Unsupported PKI Type for Message Signature"
return False
pubkey_1.verify_init()
pubkey_1.verify_update(s)
if pubkey_1.verify_final(sig) != 1:
print "ERROR: Invalid Signature for Payment Request Data"
return False
### SIG Verified
self.payment_details = pay_det = paymentrequest_pb2.PaymentDetails()
pay_det.ParseFromString(paymntreq.serialized_payment_details)
if pay_det.expires and pay_det.expires < int(time.time()):
print "ERROR: Payment Request has Expired."
#return False
for o in pay_det.outputs:
addr = transaction.get_address_from_output_script(o.script)[1]
self.outputs.append( (addr, o.amount) )
if CA_match:
print 'Signed By Trusted CA: ', CA_OU
return pay_det
def send_ack(self, raw_tx, refund_addr):
pay_det = self.payment_details
if pay_det.payment_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(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 "Payment Message/PaymentACK Failed"
print e
return
try:
paymntack = paymentrequest_pb2.PaymentACK()
paymntack.ParseFromString(r.content)
print "PaymentACK message received: %s" % paymntack.memo
except Exception:
print "PaymentACK could not be processed. Payment was sent; please manually verify that payment was received."
if __name__ == "__main__":
try:
uri = sys.argv[1]
except:
print "usage: %s url"%sys.argv[0]
print "example url: \"bitcoin:mpu3yTLdqA1BgGtFUwkVJmhnU3q5afaFkf?r=https%3A%2F%2Fbitcoincore.org%2F%7Egavin%2Ff.php%3Fh%3D2a828c05b8b80dc440c80a5d58890298&amount=1\""
sys.exit(1)
address, amount, label, message, request_url, url = util.parse_url(uri)
pr = PaymentRequest(request_url)
if not pr.verify():
sys.exit(1)
print 'Payment Request Verified Domain: ', pr.domain
print 'outputs', pr.outputs
print 'Payment Memo: ', pr.payment_details.memo
tx = "blah"
pr.send_ack(tx, refund_addr = "1vXAXUnGitimzinpXrqDWVU4tyAAQ34RA")