/usr/share/nghttp2/fetch-ocsp-response is in nghttp2-proxy 1.30.0-1ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 | #!/usr/bin/env python3
# -*- coding: utf-8 -*-
# nghttp2 - HTTP/2 C Library
# Copyright (c) 2015 Tatsuhiro Tsujikawa
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
# This program was translated from the program originally developed by
# h2o project (https://github.com/h2o/h2o), written in Perl. It had
# the following copyright notice:
# Copyright (c) 2015 DeNA Co., Ltd.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
from __future__ import unicode_literals
import argparse
import io
import os
import os.path
import re
import shutil
import subprocess
import sys
import tempfile
# make this program work for both Python 3 and Python 2.
try:
from urllib.parse import urlparse
stdout_bwrite = sys.stdout.buffer.write
except ImportError:
from urlparse import urlparse
stdout_bwrite = sys.stdout.write
def die(msg):
sys.stderr.write(msg)
sys.stderr.write('\n')
sys.exit(255)
def tempfail(msg):
sys.stderr.write(msg)
sys.stderr.write('\n')
sys.exit(os.EX_TEMPFAIL)
def run_openssl(args, allow_tempfail=False):
buf = io.BytesIO()
try:
p = subprocess.Popen(args, stdout=subprocess.PIPE)
except Exception as e:
die('failed to invoke {}:{}'.format(args, e))
try:
while True:
data = p.stdout.read()
if len(data) == 0:
break
buf.write(data)
if p.wait() != 0:
raise Exception('nonzero return code {}'.format(p.returncode))
return buf.getvalue()
except Exception as e:
msg = 'OpenSSL exitted abnormally: {}:{}'.format(args, e)
tempfail(msg) if allow_tempfail else die(msg)
def read_file(path):
with open(path, 'rb') as f:
return f.read()
def write_file(path, data):
with open(path, 'wb') as f:
f.write(data)
def detect_openssl_version(cmd):
return run_openssl([cmd, 'version']).decode('utf-8').strip()
def extract_ocsp_uri(cmd, cert_fn):
# obtain ocsp uri
ocsp_uri = run_openssl(
[cmd, 'x509', '-in', cert_fn, '-noout',
'-ocsp_uri']).decode('utf-8').strip()
if not re.match(r'^https?://', ocsp_uri):
die('failed to extract ocsp URI from {}'.format(cert_fn))
return ocsp_uri
def save_issuer_certificate(issuer_fn, cert_fn):
# save issuer certificate
chain = read_file(cert_fn).decode('utf-8')
m = re.match(
r'.*?-----END CERTIFICATE-----.*?(-----BEGIN CERTIFICATE-----.*?-----END CERTIFICATE-----)',
chain, re.DOTALL)
if not m:
die('--issuer option was not used, and failed to extract issuer certificate from the certificate')
write_file(issuer_fn, (m.group(1) + '\n').encode('utf-8'))
def send_and_receive_ocsp(respder_fn, cmd, cert_fn, issuer_fn, ocsp_uri,
ocsp_host, openssl_version):
# obtain response (without verification)
sys.stderr.write('sending OCSP request to {}\n'.format(ocsp_uri))
args = [
cmd, 'ocsp', '-issuer', issuer_fn, '-cert', cert_fn, '-url', ocsp_uri,
'-noverify', '-respout', respder_fn
]
ver = openssl_version.lower()
if ver.startswith('openssl 1.0.') or ver.startswith('libressl '):
args.extend(['-header', 'Host', ocsp_host])
resp = run_openssl(args, allow_tempfail=True)
return resp.decode('utf-8')
def verify_response(cmd, tempdir, issuer_fn, respder_fn):
# verify the response
sys.stderr.write('verifying the response signature\n')
verify_fn = os.path.join(tempdir, 'verify.out')
# try from exotic options
allextra = [
# for comodo
['-VAfile', issuer_fn],
# these options are only available in OpenSSL >= 1.0.2
['-partial_chain', '-trusted_first', '-CAfile', issuer_fn],
# for OpenSSL <= 1.0.1
['-CAfile', issuer_fn],
]
for extra in allextra:
with open(verify_fn, 'w+b') as f:
args = [cmd, 'ocsp', '-respin', respder_fn]
args.extend(extra)
p = subprocess.Popen(args, stdout=f, stderr=f)
if p.wait() == 0:
# OpenSSL <= 1.0.1, openssl ocsp still returns exit
# code 0 even if verification was failed. So check
# the error message in stderr output.
f.seek(0)
if f.read().decode('utf-8').find(
'Response Verify Failure') != -1:
continue
sys.stderr.write('verify OK (used: {})\n'.format(extra))
return True
sys.stderr.write(read_file(verify_fn).decode('utf-8'))
return False
def fetch_ocsp_response(cmd, cert_fn, tempdir, issuer_fn=None):
openssl_version = detect_openssl_version(cmd)
sys.stderr.write(
'fetch-ocsp-response (using {})\n'.format(openssl_version))
ocsp_uri = extract_ocsp_uri(cmd, cert_fn)
ocsp_host = urlparse(ocsp_uri).netloc
if not issuer_fn:
issuer_fn = os.path.join(tempdir, 'issuer.crt')
save_issuer_certificate(issuer_fn, cert_fn)
respder_fn = os.path.join(tempdir, 'resp.der')
resp = send_and_receive_ocsp(
respder_fn, cmd, cert_fn, issuer_fn, ocsp_uri, ocsp_host,
openssl_version)
sys.stderr.write('{}\n'.format(resp))
# OpenSSL 1.0.2 still returns exit code 0 even if ocsp responder
# returned error status (e.g., trylater(3))
if resp.find('Responder Error:') != -1:
raise Exception('responder returned error')
if not verify_response(cmd, tempdir, issuer_fn, respder_fn):
tempfail('failed to verify the response')
# success
res = read_file(respder_fn)
stdout_bwrite(res)
if __name__ == '__main__':
parser = argparse.ArgumentParser(
description=
'''The command issues an OCSP request for given server certificate, verifies the response and prints the resulting DER.''',
epilog=
'''The command exits 0 if successful, or 75 (EX_TEMPFAIL) on temporary error. Other exit codes may be returned in case of hard errors.''')
parser.add_argument(
'--issuer',
metavar='FILE',
help=
'issuer certificate (if omitted, is extracted from the certificate chain)')
parser.add_argument('--openssl',
metavar='CMD',
help='openssl command to use (default: "openssl")',
default='openssl')
parser.add_argument('certificate',
help='path to certificate file to validate')
args = parser.parse_args()
tempdir = None
try:
# Python3.2 has tempfile.TemporaryDirectory, which has nice
# feature to delete its tree by cleanup() function. We have
# to support Python2.7, so we have to do this manually.
tempdir = tempfile.mkdtemp()
fetch_ocsp_response(args.openssl, args.certificate, tempdir,
args.issuer)
finally:
if tempdir:
shutil.rmtree(tempdir)
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