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#!/usr/bin/python3
# vim:set et sw=4:
#
# certdata2pem.py - splits certdata.txt into multiple files
#
# Copyright (C) 2009 Philipp Kern <pkern@debian.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
# USA.
import base64
import datetime
import os.path
import re
import sys
import textwrap
import io
from cryptography import x509
objects = []
# Dirty file parser.
in_data, in_multiline, in_obj = False, False, False
field, type, value, obj = None, None, None, dict()
# Python 3 will not let us decode non-ascii characters if we
# have not specified an encoding, but Python 2's open does not
# have an option to set the encoding. Python 3's open is io.open
# and io.open has been backported to Python 2.6 and 2.7, so use io.open.
for line in io.open('certdata.txt', 'rt', encoding='utf8'):
# Ignore the file header.
if not in_data:
if line.startswith('BEGINDATA'):
in_data = True
continue
# Ignore comment lines.
if line.startswith('#'):
continue
# Empty lines are significant if we are inside an object.
if in_obj and len(line.strip()) == 0:
objects.append(obj)
obj = dict()
in_obj = False
continue
if len(line.strip()) == 0:
continue
if in_multiline:
if not line.startswith('END'):
if type == 'MULTILINE_OCTAL':
line = line.strip()
for i in re.finditer(r'\\([0-3][0-7][0-7])', line):
value.append(int(i.group(1), 8))
else:
value += line
continue
obj[field] = value
in_multiline = False
continue
if line.startswith('CKA_CLASS'):
in_obj = True
line_parts = line.strip().split(' ', 2)
if len(line_parts) > 2:
field, type = line_parts[0:2]
value = ' '.join(line_parts[2:])
elif len(line_parts) == 2:
field, type = line_parts
value = None
else:
raise NotImplementedError('line_parts < 2 not supported.')
if type == 'MULTILINE_OCTAL':
in_multiline = True
value = bytearray()
continue
obj[field] = value
if len(obj) > 0:
objects.append(obj)
# Read blacklist.
blacklist = []
if os.path.exists('blacklist.txt'):
for line in open('blacklist.txt', 'r'):
line = line.strip()
if line.startswith('#') or len(line) == 0:
continue
item = line.split('#', 1)[0].strip()
blacklist.append(item)
# Build up trust database.
trust = dict()
for obj in objects:
if obj['CKA_CLASS'] != 'CKO_NSS_TRUST':
continue
if obj['CKA_LABEL'] in blacklist:
print("Certificate %s blacklisted, ignoring." % obj['CKA_LABEL'])
elif obj['CKA_TRUST_SERVER_AUTH'] == 'CKT_NSS_TRUSTED_DELEGATOR':
trust[obj['CKA_LABEL']] = True
elif obj['CKA_TRUST_SERVER_AUTH'] == 'CKT_NSS_NOT_TRUSTED':
print('!'*74)
print("UNTRUSTED BUT NOT BLACKLISTED CERTIFICATE FOUND: %s" % obj['CKA_LABEL'])
print('!'*74)
else:
print("Ignoring certificate %s. SAUTH=%s, EPROT=%s" % \
(obj['CKA_LABEL'], obj['CKA_TRUST_SERVER_AUTH'],
obj['CKA_TRUST_EMAIL_PROTECTION']))
for obj in objects:
if obj['CKA_CLASS'] == 'CKO_CERTIFICATE':
if not obj['CKA_LABEL'] in trust or not trust[obj['CKA_LABEL']]:
continue
cert = x509.load_der_x509_certificate(bytes(obj['CKA_VALUE']))
if cert.not_valid_after < datetime.datetime.utcnow():
print('!'*74)
print('Trusted but expired certificate found: %s' % obj['CKA_LABEL'])
print('!'*74)
bname = obj['CKA_LABEL'][1:-1].replace('/', '_')\
.replace(' ', '_')\
.replace('(', '=')\
.replace(')', '=')\
.replace(',', '_')
# this is the only way to decode the way NSS stores multi-byte UTF-8
# and we need an escaped string for checking existence of things
# otherwise we're dependant on the user's current locale.
if bytes != str:
# We're in python 3, convert the utf-8 string to a
# sequence of bytes that represents this utf-8 string
# then encode the byte-sequence as an escaped string that
# can be passed to open() and os.path.exists()
bname = bname.encode('utf-8').decode('unicode_escape').encode('latin-1')
else:
# Python 2
# Convert the unicode string back to its original byte form
# (contents of files returned by io.open are returned as
# unicode strings)
# then to an escaped string that can be passed to open()
# and os.path.exists()
bname = bname.encode('utf-8').decode('string_escape')
fname = bname + b'.crt'
if os.path.exists(fname):
print("Found duplicate certificate name %s, renaming." % bname)
fname = bname + b'_2.crt'
f = open(fname, 'w')
f.write("-----BEGIN CERTIFICATE-----\n")
encoded = base64.b64encode(obj['CKA_VALUE']).decode('utf-8')
f.write("\n".join(textwrap.wrap(encoded, 64)))
f.write("\n-----END CERTIFICATE-----\n")
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