pki/testdata/verify_certificate_chain_unittest/target-wrong-signature-no-authority-key-identifier/generate-chains.py

#!/usr/bin/env python
# Copyright 2019 The Chromium Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Certificate chain where the target was signed by a different
certificate with a different key. The target lacks an
authorityKeyIdentifier extension as some verifiers will not try verifying with
the bogus intermediate if the authorityKeyIdentifier does not match the
intermediate's subjectKeyIdentifier.
"""

import sys
sys.path += ['../..']

import gencerts

# Self-signed root certificate.
root = gencerts.create_self_signed_root_certificate('Root')

# Intermediate certificate, which actually signed the leaf.
intermediate = gencerts.create_intermediate_certificate('Intermediate', root)
section = intermediate.config.get_section('signing_ca_ext')
# Don't include authorityKeyIdentifier extension in the target issued by
# the real intermediate, otherwise the verifier might not even try to validate
# the signature against the bogus intermediate.
section.remove_property('authorityKeyIdentifier')

# Target certificate.
target = gencerts.create_end_entity_certificate('Target', intermediate)
# TODO(eroman): Set subjectAltName by default rather than specifically in
# this test.
target.get_extensions().set_property('subjectAltName', 'DNS:test.example')

# Intermediate certificate issued by root, but which did not sign target.
bogus_intermediate = gencerts.create_intermediate_certificate('Intermediate',
                                                              root)

chain = [target, bogus_intermediate, root]
gencerts.write_chain(__doc__, chain, 'chain.pem')