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# -*- coding:utf-8 -*-
# Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
#
# Use of this source code is governed by a BSD-style license
# that can be found in the LICENSE file in the root of the source
# tree. An additional intellectual property rights grant can be found
# in the file PATENTS. All contributing project authors may
# be found in the AUTHORS file in the root of the source tree.
"""This is a tool to transform a crt file into a C/C++ header.
Usage:
generate_sslroots.py cert_file.crt [--verbose | -v] [--full_cert | -f]
Arguments:
-v Print output while running.
-f Add public key and certificate name. Default is to skip and reduce
generated file size.
"""
import commands
from optparse import OptionParser
import os
import re
import string
_GENERATED_FILE = 'sslroots.h'
_PREFIX = '__generated__'
_EXTENSION = '.crt'
_SUBJECT_NAME_ARRAY = 'subject_name'
_SUBJECT_NAME_VARIABLE = 'SubjectName'
_PUBLIC_KEY_ARRAY = 'public_key'
_PUBLIC_KEY_VARIABLE = 'PublicKey'
_CERTIFICATE_ARRAY = 'certificate'
_CERTIFICATE_VARIABLE = 'Certificate'
_CERTIFICATE_SIZE_VARIABLE = 'CertificateSize'
_INT_TYPE = 'size_t'
_CHAR_TYPE = 'const unsigned char*'
_VERBOSE = 'verbose'
def main():
"""The main entrypoint."""
parser = OptionParser('usage %prog FILE')
parser.add_option('-v', '--verbose', dest='verbose', action='store_true')
parser.add_option('-f', '--full_cert', dest='full_cert', action='store_true')
options, args = parser.parse_args()
if len(args) < 1:
parser.error('No crt file specified.')
return
root_dir = _SplitCrt(args[0], options)
_GenCFiles(root_dir, options)
_Cleanup(root_dir)
def _SplitCrt(source_file, options):
sub_file_blocks = []
label_name = ''
root_dir = os.path.dirname(os.path.abspath(source_file)) + '/'
_PrintOutput(root_dir, options)
f = open(source_file)
for line in f:
if line.startswith('# Label: '):
sub_file_blocks.append(line)
label = re.search(r'\".*\"', line)
temp_label = label.group(0)
end = len(temp_label)-1
label_name = _SafeName(temp_label[1:end])
elif line.startswith('-----END CERTIFICATE-----'):
sub_file_blocks.append(line)
new_file_name = root_dir + _PREFIX + label_name + _EXTENSION
_PrintOutput('Generating: ' + new_file_name, options)
new_file = open(new_file_name, 'w')
for out_line in sub_file_blocks:
new_file.write(out_line)
new_file.close()
sub_file_blocks = []
else:
sub_file_blocks.append(line)
f.close()
return root_dir
def _GenCFiles(root_dir, options):
output_header_file = open(root_dir + _GENERATED_FILE, 'w')
output_header_file.write(_CreateOutputHeader())
if options.full_cert:
subject_name_list = _CreateArraySectionHeader(_SUBJECT_NAME_VARIABLE,
_CHAR_TYPE, options)
public_key_list = _CreateArraySectionHeader(_PUBLIC_KEY_VARIABLE,
_CHAR_TYPE, options)
certificate_list = _CreateArraySectionHeader(_CERTIFICATE_VARIABLE,
_CHAR_TYPE, options)
certificate_size_list = _CreateArraySectionHeader(_CERTIFICATE_SIZE_VARIABLE,
_INT_TYPE, options)
for _, _, files in os.walk(root_dir):
for current_file in files:
if current_file.startswith(_PREFIX):
prefix_length = len(_PREFIX)
length = len(current_file) - len(_EXTENSION)
label = current_file[prefix_length:length]
filtered_output, cert_size = _CreateCertSection(root_dir, current_file,
label, options)
output_header_file.write(filtered_output + '\n\n\n')
if options.full_cert:
subject_name_list += _AddLabelToArray(label, _SUBJECT_NAME_ARRAY)
public_key_list += _AddLabelToArray(label, _PUBLIC_KEY_ARRAY)
certificate_list += _AddLabelToArray(label, _CERTIFICATE_ARRAY)
certificate_size_list += (' %s,\n') %(cert_size)
if options.full_cert:
subject_name_list += _CreateArraySectionFooter()
output_header_file.write(subject_name_list)
public_key_list += _CreateArraySectionFooter()
output_header_file.write(public_key_list)
certificate_list += _CreateArraySectionFooter()
output_header_file.write(certificate_list)
certificate_size_list += _CreateArraySectionFooter()
output_header_file.write(certificate_size_list)
output_header_file.close()
def _Cleanup(root_dir):
for f in os.listdir(root_dir):
if f.startswith(_PREFIX):
os.remove(root_dir + f)
def _CreateCertSection(root_dir, source_file, label, options):
command = 'openssl x509 -in %s%s -noout -C' %(root_dir, source_file)
_PrintOutput(command, options)
output = commands.getstatusoutput(command)[1]
renamed_output = output.replace('unsigned char XXX_',
'const unsigned char ' + label + '_')
filtered_output = ''
cert_block = '^const unsigned char.*?};$'
prog = re.compile(cert_block, re.IGNORECASE | re.MULTILINE | re.DOTALL)
if not options.full_cert:
filtered_output = prog.sub('', renamed_output, count=2)
else:
filtered_output = renamed_output
cert_size_block = r'\d\d\d+'
prog2 = re.compile(cert_size_block, re.MULTILINE | re.VERBOSE)
result = prog2.findall(renamed_output)
cert_size = result[len(result) - 1]
return filtered_output, cert_size
def _CreateOutputHeader():
output = ('// This file is the root certificates in C form that are needed to'
' connect to\n// Google.\n\n'
'// It was generated with the following command line:\n'
'// > python tools/certs/generate_sslroots.py'
'\n// https://pki.google.com/roots.pem\n\n')
return output
def _CreateArraySectionHeader(type_name, type_type, options):
output = ('const %s kSSLCert%sList[] = {\n') %(type_type, type_name)
_PrintOutput(output, options)
return output
def _AddLabelToArray(label, type_name):
return ' %s_%s,\n' %(label, type_name)
def _CreateArraySectionFooter():
return '};\n\n'
def _SafeName(original_file_name):
bad_chars = ' -./\\()áéíőú'
replacement_chars = ''
for _ in bad_chars:
replacement_chars += '_'
translation_table = string.maketrans(bad_chars, replacement_chars)
return original_file_name.translate(translation_table)
def _PrintOutput(output, options):
if options.verbose:
print output
if __name__ == '__main__':
main()
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