#!/usr/bin/python

# 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 os.path

import re

import sys

import textwrap

objects = []

# Dirty file parser.

in_data, in_multiline, in_obj = False, False, False

field, type, value, obj = None, None, None, dict()

for line in open('certdata.txt', 'r'):

    # 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 += chr(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 = ""

        continue

    obj[field] = value

if len(obj.items()) > 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()

trustmap = 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_EMAIL_PROTECTION'] == 'CKT_NSS_TRUSTED_DELEGATOR':

        trust[obj['CKA_LABEL']] = True

    elif obj['CKA_TRUST_CODE_SIGNING'] == 'CKT_NSS_TRUSTED_DELEGATOR':

        trust[obj['CKA_LABEL']] = True

    elif obj['CKA_TRUST_SERVER_AUTH'] == 'CKT_NSS_UNTRUSTED':

        print '!'*74

        print "UNTRUSTED BUT NOT BLACKLISTED CERTIFICATE FOUND: %s" % obj['CKA_LABEL']

        print '!'*74

        sys.exit(1)

    else:

        print "Ignoring certificate %s.  SAUTH=%s, EPROT=%s" % \

              (obj['CKA_LABEL'], obj['CKA_TRUST_SERVER_AUTH'],

               obj['CKA_TRUST_EMAIL_PROTECTION'])

    label = obj['CKA_LABEL']

    trustmap[label] = obj

    print " added cert", label

def label_to_filename(label):

    label = label.replace('/', '_')\

        .replace(' ', '_')\

        .replace('(', '=')\

        .replace(')', '=')\

        .replace(',', '_') + '.crt'

    return re.sub(r'\\x[0-9a-fA-F]{2}', lambda m:chr(int(m.group(0)[2:], 16)), label)

trust_types = {

  "CKA_TRUST_DIGITAL_SIGNATURE": "digital-signature",

  "CKA_TRUST_NON_REPUDIATION": "non-repudiation",

  "CKA_TRUST_KEY_ENCIPHERMENT": "key-encipherment",

  "CKA_TRUST_DATA_ENCIPHERMENT": "data-encipherment",

  "CKA_TRUST_KEY_AGREEMENT": "key-agreement",

  "CKA_TRUST_KEY_CERT_SIGN": "cert-sign",

  "CKA_TRUST_CRL_SIGN": "crl-sign",

  "CKA_TRUST_SERVER_AUTH": "server-auth",

  "CKA_TRUST_CLIENT_AUTH": "client-auth",

  "CKA_TRUST_CODE_SIGNING": "code-signing",

  "CKA_TRUST_EMAIL_PROTECTION": "email-protection",

  "CKA_TRUST_IPSEC_END_SYSTEM": "ipsec-end-system",

  "CKA_TRUST_IPSEC_TUNNEL": "ipsec-tunnel",

  "CKA_TRUST_IPSEC_USER": "ipsec-user",

  "CKA_TRUST_TIME_STAMPING": "time-stamping",

  "CKA_TRUST_STEP_UP_APPROVED": "step-up-approved",

}

openssl_trust = {

  "CKA_TRUST_SERVER_AUTH": "serverAuth",

  "CKA_TRUST_CLIENT_AUTH": "clientAuth",

  "CKA_TRUST_CODE_SIGNING": "codeSigning",

  "CKA_TRUST_EMAIL_PROTECTION": "emailProtection",

}

for obj in objects:

    if obj['CKA_CLASS'] == 'CKO_CERTIFICATE':

        print "producing cert file for " + obj['CKA_LABEL']

        if not obj['CKA_LABEL'] in trust or not trust[obj['CKA_LABEL']]:

            print " -> untrusted, ignoring"

            continue

        fname = label_to_filename(obj['CKA_LABEL'][1:-1])

        f = open(fname, 'w')

        trustbits = []

        openssl_trustflags = []

        tobj = trustmap[obj['CKA_LABEL']]

        for t in trust_types.keys():

            if tobj.has_key(t) and tobj[t] == 'CKT_NSS_TRUSTED_DELEGATOR':

                trustbits.append(t)

                if t in openssl_trust:

                    openssl_trustflags.append(openssl_trust[t])

        f.write("# trust=" + " ".join(trustbits) + "\n")

        if openssl_trustflags:

            f.write("# openssl-trust=" + " ".join(openssl_trustflags) + "\n")

        f.write("-----BEGIN CERTIFICATE-----\n")

        f.write("\n".join(textwrap.wrap(base64.b64encode(obj['CKA_VALUE']), 64)))

        f.write("\n-----END CERTIFICATE-----\n")

        print " -> written as '%s', trust = %s, openssl-trust = %s" % (fname, trustbits, openssl_trustflags)