88 lines
2.4 KiB
Python
88 lines
2.4 KiB
Python
# Copyright 2026 jCloud Services GbR
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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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# https://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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from cryptography.hazmat.primitives.asymmetric import padding
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from cryptography import x509
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import datetime
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__all__ = [
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'load_cert_file',
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'Identity',
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'Verifier'
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]
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def load_cert_file(path: str) -> x509.Certificate:
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'''
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Loads a certificate from a file
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:param path: File path
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:type path: str
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:return: The certificate
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:rtype: cryptography.x509.Certificate
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'''
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with open(path, 'rb') as f:
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cert_data = f.read()
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return x509.load_pem_x509_certificate(cert_data)
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class Identity:
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def __init__(self, cert: x509.Certificate = None):
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self.cert = cert
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@property
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def public_key(self):
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return self.cert.public_key()
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@property
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def issuer(self):
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return self.cert.issuer
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@property
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def subject(self):
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return self.cert.subject
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@property
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def not_valid_before(self):
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return self.cert.not_valid_before_utc
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@property
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def not_valid_after(self):
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return self.cert.not_valid_after_utc
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@property
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def signature_algorithm(self):
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return self.cert.signature_hash_algorithm
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class Verifier:
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def __init__(self, trusted_ca: Identity):
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self.trusted_ca = trusted_ca
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def verify(self, identity: Identity, now = datetime.datetime.now(datetime.timezone.utc), verify_issuer = True):
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if not (identity.not_valid_before <= now <= identity.not_valid_after):
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return False
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try:
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self.trusted_ca.public_key.verify(
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identity.cert.signature,
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identity.cert.tbs_certificate_bytes,
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padding.PKCS1v15(),
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identity.cert.signature_hash_algorithm
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)
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except:
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return False
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if (identity.issuer != self.trusted_ca.subject) and verify_issuer:
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return False
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return True |