209 lines
7.4 KiB
Python
209 lines
7.4 KiB
Python
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import hashlib
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import httplib
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import os.path
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import re
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import sys
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import threading
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import time
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import traceback
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import urllib2
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try:
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import paymentrequest_pb2
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except:
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print "protoc --proto_path=lib/ --python_out=lib/ lib/paymentrequest.proto"
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sys.exit(1)
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import urlparse
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import requests
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from M2Crypto import X509
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from bitcoin import is_valid
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import urlparse
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import transaction
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REQUEST_HEADERS = {'Accept': 'application/bitcoin-paymentrequest', 'User-Agent': 'Electrum'}
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ACK_HEADERS = {'Content-Type':'application/bitcoin-payment','Accept':'application/bitcoin-paymentack','User-Agent':'Electrum'}
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class PaymentRequest:
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def __init__(self):
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self.ca_path = os.path.expanduser("~/.electrum/ca/ca-bundle.crt")
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self.ca_list = {}
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try:
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with open(self.ca_path, 'r') as ca_f:
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c = ""
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for line in ca_f:
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if line == "-----BEGIN CERTIFICATE-----\n":
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c = line
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else:
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c += line
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if line == "-----END CERTIFICATE-----\n":
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x = X509.load_cert_string(c)
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self.ca_list[x.get_fingerprint()] = x
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except Exception:
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print "ERROR: Could not open %s"%self.ca_path
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print "ca-bundle.crt file should be placed in ~/.electrum/ca/ca-bundle.crt"
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print "Documentation on how to download or create the file here: http://curl.haxx.se/docs/caextract.html"
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print "Payment will continue with manual verification."
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def verify(self, url):
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u = urlparse.urlparse(urllib2.unquote(url))
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self.domain = u.netloc
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connection = httplib.HTTPConnection(u.netloc) if u.scheme == 'http' else httplib.HTTPSConnection(u.netloc)
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connection.request("GET",u.geturl(), headers=REQUEST_HEADERS)
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resp = connection.getresponse()
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r = resp.read()
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paymntreq = paymentrequest_pb2.PaymentRequest()
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paymntreq.ParseFromString(r)
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sig = paymntreq.signature
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cert = paymentrequest_pb2.X509Certificates()
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cert.ParseFromString(paymntreq.pki_data)
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cert_num = len(cert.certificate)
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x509_1 = X509.load_cert_der_string(cert.certificate[0])
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if self.domain != x509_1.get_subject().CN:
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###TODO: check for subject alt names
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### check for wildcards
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print "ERROR: Certificate Subject Domain Mismatch"
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print self.domain, x509_1.get_subject().CN
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#return
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x509 = []
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CA_OU = ''
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if cert_num > 1:
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for i in range(cert_num - 1):
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x509.append(X509.load_cert_der_string(cert.certificate[i+1]))
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if x509[i].check_ca() == 0:
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print "ERROR: Supplied CA Certificate Error"
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return
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for i in range(cert_num - 1):
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if i == 0:
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if x509_1.verify(x509[i].get_pubkey()) != 1:
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print "ERROR: Certificate not Signed by Provided CA Certificate Chain"
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return
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else:
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if x509[i-1].verify(x509[i].get_pubkey()) != 1:
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print "ERROR: CA Certificate not Signed by Provided CA Certificate Chain"
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return
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supplied_CA_fingerprint = x509[cert_num-2].get_fingerprint()
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supplied_CA_CN = x509[cert_num-2].get_subject().CN
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CA_match = False
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x = self.ca_list.get(supplied_CA_fingerprint)
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if x:
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CA_OU = x.get_subject().OU
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CA_match = True
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if x.get_subject().CN != supplied_CA_CN:
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print "ERROR: Trusted CA CN Mismatch; however CA has trusted fingerprint"
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print "Payment will continue with manual verification."
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else:
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print "ERROR: Supplied CA Not Found in Trusted CA Store."
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print "Payment will continue with manual verification."
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else:
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print "ERROR: CA Certificate Chain Not Provided by Payment Processor"
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return False
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paymntreq.signature = ''
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s = paymntreq.SerializeToString()
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pubkey_1 = x509_1.get_pubkey()
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if paymntreq.pki_type == "x509+sha256":
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pubkey_1.reset_context(md="sha256")
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elif paymntreq.pki_type == "x509+sha1":
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pubkey_1.reset_context(md="sha1")
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else:
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print "ERROR: Unsupported PKI Type for Message Signature"
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return False
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pubkey_1.verify_init()
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pubkey_1.verify_update(s)
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if pubkey_1.verify_final(sig) != 1:
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print "ERROR: Invalid Signature for Payment Request Data"
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return False
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### SIG Verified
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self.payment_details = pay_det = paymentrequest_pb2.PaymentDetails()
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pay_det.ParseFromString(paymntreq.serialized_payment_details)
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if pay_det.expires and pay_det.expires < int(time.time()):
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print "ERROR: Payment Request has Expired."
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return False
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self.outputs = []
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for o in pay_det.outputs:
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addr = transaction.get_address_from_output_script(o.script)[1]
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self.outputs.append( (addr, o.amount) )
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if CA_match:
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print 'Signed By Trusted CA: ', CA_OU
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return True
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def send_ack(self, raw_tx, refund_addr):
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pay_det = self.payment_details
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if pay_det.payment_url:
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paymnt = paymentrequest_pb2.Payment()
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paymnt.merchant_data = pay_det.merchant_data
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paymnt.transactions.append(raw_tx)
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ref_out = paymnt.refund_to.add()
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ref_out.script = transaction.Transaction.pay_script(refund_addr)
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paymnt.memo = "Paid using Electrum"
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pm = paymnt.SerializeToString()
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payurl = urlparse.urlparse(pay_det.payment_url)
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try:
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r = requests.post(payurl.geturl(), data=pm, headers=ACK_HEADERS, verify=self.ca_path)
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except requests.exceptions.SSLError:
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print "Payment Message/PaymentACK verify Failed"
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try:
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r = requests.post(payurl.geturl(), data=pm, headers=ACK_HEADERS, verify=False)
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except Exception as e:
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print "Payment Message/PaymentACK Failed"
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print e
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return
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try:
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paymntack = paymentrequest_pb2.PaymentACK()
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paymntack.ParseFromString(r.content)
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print "PaymentACK message received: %s" % paymntack.memo
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except Exception:
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print "PaymentACK could not be processed. Payment was sent; please manually verify that payment was received."
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uri = "bitcoin:mpu3yTLdqA1BgGtFUwkVJmhnU3q5afaFkf?r=https%3A%2F%2Fbitcoincore.org%2F%7Egavin%2Ff.php%3Fh%3D26c19879d44c3891214e7897797b9160&amount=1"
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url = "https%3A%2F%2Fbitcoincore.org%2F%7Egavin%2Ff.php%3Fh%3D26c19879d44c3891214e7897797b9160"
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#uri = "bitcoin:1m9Lw2pFCe6Hs7xUuo9fMJCzEwQNdCo5e?amount=0.0012&r=https%3A%2F%2Fbitpay.com%2Fi%2F8XNDiQU92H2whNG4j8hZ5M"
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#url = "https%3A%2F%2Fbitpay.com%2Fi%2F8XNDiQU92H2whNG4j8hZ5M"
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if __name__ == "__main__":
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pr = PaymentRequest()
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if not pr.verify(url):
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sys.exit(1)
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print 'Payment Request Verified Domain: ', pr.domain
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print 'outputs', pr.outputs
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print 'Payment Memo: ', pr.payment_details.memo
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tx = "blah"
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pr.send_ack(tx, "1vXAXUnGitimzinpXrqDWVU4tyAAQ34RA")
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