65 lines
2.3 KiB
Python
65 lines
2.3 KiB
Python
# -*- coding: utf-8 -*- #
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# Copyright 2022 Google LLC. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Helpers for parsing certificates."""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import unicode_literals
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import base64
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from googlecloudsdk.calliope import exceptions
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from googlecloudsdk.core.util import files
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import six
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def GetDerCertificate(certificate_file):
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"""Read certificate_file and return the certificate in DER encoding.
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Args:
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certificate_file: A file handle to the certificate in PEM or DER format.
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Returns:
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The certificate in DER encoding.
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Raises:
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BadArgumentException: The provided certificate failed to parse as a PEM.
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"""
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data = files.ReadBinaryFileContents(certificate_file)
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if b'-----BEGIN CERTIFICATE-----' in data:
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certb64 = data.replace(b'-----BEGIN CERTIFICATE-----', b'', 1)
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certb64 = certb64.replace(b'-----END CERTIFICATE-----', b'', 1)
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# If there's another certificate detected afterwards
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if b'-----BEGIN CERTIFICATE-----' in certb64:
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raise exceptions.BadArgumentException(
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'certificate_file',
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'Cannot place multiple certificates in the same file : {}'.format(
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certificate_file))
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try:
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certb64 = certb64.replace(b'\r', b'').replace(b'\n', b'')
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# Since validate=True isn't supported on Python2's base64.b64decode,
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# re-encode output and compare to original.
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decoded = base64.b64decode(six.ensure_binary(certb64))
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encoded = base64.b64encode(decoded)
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if encoded != certb64:
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raise ValueError('Non-base64 digit found.')
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except Exception as e:
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raise exceptions.BadArgumentException(
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'certificate_file',
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'Recognized {} as a PEM file but failed during parsing : {}'.format(
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certificate_file, e))
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return decoded
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else:
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return data
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