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#!/usr/bin/python
#
# Copyright (C) 2015, Jaguar Land Rover
#
# This program is licensed under the terms and conditions of the
# Mozilla Public License, version 2.0. T full text of the
# Mozilla Public License is at https://www.mozilla.org/MPL/2.0/
#
# Create a certificate giving the sender the right to invoke and
#
import getopt
import sys
from Crypto.PublicKey import RSA
# apt-get install python-dev
# apt-get install libffi-dev
# pip install cryptography
# pip install PyJWT
import jwt
import time
import json
import base64
import struct
def long2intarr(long_int):
_bytes = []
while long_int:
long_int, r = divmod(long_int, 256)
_bytes.insert(0, r)
return _bytes
# copied from https://github.com/rohe/pyjwkest
def long_to_base64(n):
bys = long2intarr(n)
data = struct.pack('%sB' % len(bys), *bys)
if not len(data):
data = '\x00'
s = base64.urlsafe_b64encode(data).rstrip(b'=')
return s
def usage():
print "Usage:", sys.argv[0], "--id=<id> --invoke='<services>' -register='<services>' \\"
print " --root_key=<file> --start='<date/time>' --stop='<date/time>' \\"
print " --out=<file>"
print
print " --id=<id> System-wide unique certificate ID"
print
print " --invoke='<services>' Right to invoke service. Space separate multiple services."
print
print " --register='<services>' Right to register service. Space separate multiple services."
print " At least one --invoke or --register must be given."
print
print " --root_key=<file> Private root key to sign certificate with"
print " Mandatory"
print
print " --device_key=<file> Public device key to include in certificate"
print " Mandatory"
print
print " --start='<YYYY-MM-DD HH:MM:SS>' Date and time when certificate is activated."
print " Default: current time."
print
print " --stop='<YYYY-MM-DD HH:MM:SS>' Date and time when certificate is deactivated."
print " Default: 365 days from current time"
print
print " --jwt_out=<file> File name to store JWT-encoded certificate in."
print " Default: stdout"
print
print " --cert_out=<file> File name to unencoded JSON certificate in."
print " Default: Do not store certificate"
print
print " --issuer=issuer Name of the issuer. Default: jaguarlandrover.com"
print
print "Root key file is generated by rvi_create_root_key.sh"
print
print "Device key is the '_pub.pem'-suffixed file created by rvi_create_device_key.py"
print
print "Certificate file specified by out should be placed in 'priv/certs'"
print
print
print "Example:"
print "./rvi_create_certificate.py --id=317624d8-2ccf-11e5-993c-7f3b5182c649 \\"
print " --device_key=device_key_pub.pem \\"
print " --start='2015-12-01 00:00:00' \\"
print " --stop='2015-12-31 23:59:59' \\"
print " --root_key=root_key_priv.pem \\"
print " --register='jlr.com/vin/abc/unlock jlr.com/vin/abc/lock' \\"
print " --invoke='jlr.com/backend/report jlr.com/backend/set_state' \\"
print " --jwt_out=lock_cert.jwt \\"
print " --cert_out=lock_cert.json"
sys.exit(255)
try:
opts, args = getopt.getopt(sys.argv[1:], "", [ 'issuer=', 'invoke=', 'register=',
'root_key=', 'start=',
'stop=', 'cert_out=', 'id=',
'jwt_out=', 'device_key='])
except getopt.GetoptError as e:
print
print e
print
usage()
start=int(time.time())
stop=int(time.time()) + 86400 * 365
issuer='jaguarlandrover.com'
invoke=None
register=None
root_key=None
device_key=None
jwt_out_file=None
cert_out_file=None
id_string=None
for o, a in opts:
if o == "--start":
try:
start = int(time.mktime(time.strptime(a, "%Y-%m-%d %H:%M:%S")))
except:
print
print "Incorrect start time: {}".format(a)
print
usage()
elif o == '--root_key':
try:
root_key_fname = a
root_key_file = open(root_key_fname, "r")
root_key = RSA.importKey(root_key_file.read())
root_key_file.close()
except IOError as e:
print "Coould read root cert from {0}: {1}".format(a, e.strerror)
sys.exit(255)
elif o == '--device_key':
try:
device_key_file = open(a, "r")
device_key = RSA.importKey(device_key_file.read())
device_key_file.close()
except IOError as e:
print "Coould read root cert from {0}: {1}".format(a, e.strerror)
sys.exit(255)
elif o == "--stop":
try:
stop = int(time.mktime(time.strptime(a, "%Y-%m-%d %H:%M:%S")))
except:
print
print "Incorrect stop time: {}".format(a)
print
usage()
elif o == '--invoke':
invoke=a.split(' ')
elif o == '--register':
register=a.split(' ')
elif o == '--id':
id_string=a
elif o == '--issuer':
issuer=a
elif o == '--jwt_out':
try:
jwt_out_file = open(a, "w")
except IOError as e:
print "Coould write to JWT file {0}: {1}".format(a, e.strerror)
sys.exit(255)
elif o == '--cert_out':
try:
cert_out_file = open(a, "w")
except IOError as e:
print "Coould write to certificate file {0}: {1}".format(a, e.strerror)
sys.exit(255)
else:
print
print "Unknown command line argument: {}".format(o)
print
usage()
if jwt_out_file == None:
jwt_out_file = sys.stdout
if not invoke and not register:
print
print "At least one --invoke or --register service must be specified."
print
usage()
if not root_key:
print
print "No --root_key=<root_key_file.pem> specified"
print
usage()
if not device_key:
print
print "No --device_key=<device_public_key_file.pem> specified"
print
usage()
if not id_string:
print
print "No --id=<id_string> specified"
print
usage()
# Create a JSON Web Key based off our public device key PEM file
cert = {
'iss': issuer,
'id': id_string,
'sources': register,
'destinations': invoke,
'create_timestamp': int(time.time()),
'keys': [{
"kty": "RSA",
"alg": "RS256",
"use": "sig",
"e": long_to_base64(device_key.e),
"n": long_to_base64(device_key.n)
}],
'validity': {
'start': start,
'stop': stop
}
}
encoded = jwt.encode(cert, root_key.exportKey("PEM"), algorithm='RS256')
# Validate
try:
jwt.decode(encoded, root_key.publickey().exportKey("PEM"))
except:
print "FAILED: Could not verify signed JSON Web Token using public part of"
print " root key {}".format(root_key_fname)
jwt_out_file.write(encoded)
jwt_out_file.close()
if cert_out_file:
cert_out_file.write(json.dumps(cert, sort_keys=True, indent=4, separators=(',', ': ')) + '\n')
cert_out_file.close()
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