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#!/usr/bin/env python2
from __future__ import print_function
from datetime import datetime
from hashlib import sha1
import argparse
import os.path
from pyasn1_modules import pem
from pyx509.pkcs7.asn1_models.X509_certificate import Certificate
from pyx509.pkcs7_models import X509Certificate
from pyx509.pkcs7.asn1_models.decoder_workarounds import decode
ALTNAME_MAP = (
('dNSName', 'DNS'),
('rfc822Name', 'EMAIL'),
('iPAddress', 'IP')
)
def x509_parse(derData):
"""Decodes certificate.
@param derData: DER-encoded certificate string
@returns: pkcs7_models.X509Certificate
"""
cert = decode(derData, asn1Spec=Certificate())[0]
x509cert = X509Certificate(cert)
return x509cert
def get_altnames(cert):
altnames = cert.tbsCertificate.subjAltNameExt.value.values
retval = []
for typ, data in [(field[1], altnames[field[0]]) for field in ALTNAME_MAP]:
for item in sorted(data):
retval.append("{typ}:{item}".format(typ=typ, item=item))
return ", ".join(retval)
def get_serial(cert):
serial = "%X" % cert.tbsCertificate.serial_number
return "0" * (len(serial) % 2) + serial
def get_expiration(cert):
return datetime.strptime(
cert.tbsCertificate.validity.valid_to, '%Y%m%d%H%M%SZ'
).strftime('%b %d %Y %H:%M:%S GMT')
def get_sha1fp(certdata):
hexhash = sha1(certdata).hexdigest().upper()
return ":".join([hexhash[i:i+2] for i in range(0, len(hexhash), 2)])
def get_issuer(cert):
return cert.tbsCertificate.issuer.get_attributes()['CN'][0]
def get_subject(cert):
return cert.tbsCertificate.subject.get_attributes()['CN'][0]
if __name__ == '__main__':
parser = argparse.ArgumentParser(
description=(
'Create an sslcert directive from data taken from a PEM encoded '
'X.509 certificate file and its corresponding PEM encoded RSA key '
'file.'))
parser.add_argument(
'cert', metavar='CERT', type=open,
help='PEM encoded X.509 certficate file')
parser.add_argument(
'--key', metavar='KEY', type=open,
help='PEM encoded RSA private key', default=None)
args = parser.parse_args()
certpem = pem.readPemFromFile(args.cert)
certpath = os.path.abspath(args.cert.name)
if args.key:
haskey = True
keypem = pem.readPemFromFile(args.key)
keypath = os.path.abspath(args.key.name)
else:
keypath = 'TODO: define key path'
cert = x509_parse(certpem)
data = {
'altnames': get_altnames(cert),
'certfile': certpath,
'keyfile': keypath,
'serial': get_serial(cert),
'expiration': get_expiration(cert),
'sha1fp': get_sha1fp(certpem),
'issuer': get_issuer(cert),
'subject': get_subject(cert),
}
print(""".. sslcert:: {subject}
:altnames: {altnames}
:certfile: {certfile}
:keyfile: {keyfile}
:serial: {serial}
:expiration: {expiration}
:sha1fp: {sha1fp}
:issuer: {issuer}
""".format(**data))
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