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#!/usr/bin/env python3
from __future__ import print_function
import argparse
import os.path
from hashlib import sha1
from asn1crypto import pem
from cryptography import x509
from cryptography.hazmat.backends import default_backend
from cryptography.x509.oid import ExtensionOID, NameOID
ALTNAME_MAP = (
(x509.DNSName, 'DNS'),
(x509.RFC822Name, 'EMAIL'),
(x509.IPAddress, 'IP')
)
def get_altnames(cert):
altnames = cert.extensions.get_extension_for_oid(
ExtensionOID.SUBJECT_ALTERNATIVE_NAME)
retval = []
for altname_type, field_name in ALTNAME_MAP:
names = altnames.value.get_values_for_type(altname_type)
for item in sorted(names):
retval.append("{typ}:{item}".format(typ=field_name, item=item))
return ", ".join(retval)
def get_serial(cert):
serial = "%X" % cert.serial_number
return "0" * (len(serial) % 2) + serial
def get_expiration(cert):
return cert.not_valid_after.strftime('%b %d %H:%M:%S %Y GMT')
def get_sha1fp(pem_data):
cert_data = pem.unarmor(pem_data)
hex_hash = sha1(cert_data[2]).hexdigest().upper()
return ":".join([hex_hash[i:i + 2] for i in range(0, len(hex_hash), 2)])
def get_issuer(cert):
return cert.issuer.get_attributes_for_oid(NameOID.COMMON_NAME)[0].value
def get_subject(cert):
return cert.subject.get_attributes_for_oid(NameOID.COMMON_NAME)[0].value
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=argparse.FileType('rb'),
help='PEM encoded X.509 certificate file')
parser.add_argument(
'--key', metavar='KEY', type=argparse.FileType('rb'),
help='PEM encoded RSA private key', default=None)
parser.add_argument(
'--root', metavar='ROOT', type=str,
help='Relative root directory for key and cert')
args = parser.parse_args()
cert_path = os.path.abspath(args.cert.name)
if args.root:
cert_path = '/' + os.path.relpath(cert_path, args.root)
if args.key:
has_key = True
key_path = os.path.abspath(args.key.name)
if args.root:
key_path = '/' + os.path.relpath(key_path, args.root)
else:
key_path = 'TODO: define key path'
cert_pem = args.cert.read()
certificate = x509.load_pem_x509_certificate(cert_pem, default_backend())
data = {
'altnames': get_altnames(certificate),
'certfile': cert_path,
'keyfile': key_path,
'serial': get_serial(certificate),
'expiration': get_expiration(certificate),
'sha1fp': get_sha1fp(cert_pem),
'issuer': get_issuer(certificate),
'subject': get_subject(certificate),
}
print(""".. sslcert:: {subject}
:altnames: {altnames}
:certfile: {certfile}
:keyfile: {keyfile}
:serial: {serial}
:expiration: {expiration}
:sha1fp: {sha1fp}
:issuer: {issuer}
""".format(**data))
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