mirror of
https://git.ugnet.gay/CrossTalk/azul.git
synced 2026-05-27 22:59:49 +00:00
Athena Funderburg
66 lines
2.1 KiB
Python
66 lines
2.1 KiB
Python
from typing import Dict, Tuple, Any, Optional
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from datetime import datetime, timedelta, timezone
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from pathlib import Path
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import ssl
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from cryptography import x509
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from cryptography.hazmat.backends import default_backend
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class TLSContext:
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def __init__(self, cert_root: str, cert_dir: str) -> None:
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self.cert_dir = Path(cert_dir)
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self.cert_root = cert_root
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self._cert_cache = {} # type: Dict[str, ssl.SSLContext]
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def create_ssl_context(self) -> ssl.SSLContext:
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self._get_root_cert()
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ssl_context = ssl.create_default_context(purpose = ssl.Purpose.CLIENT_AUTH)
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cache = self._cert_cache
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def servername_callback(socket: Any, domain: Optional[str], ssl_context: ssl.SSLSocket) -> Optional[int]:
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if domain is None:
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domain = 'no-domain'
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if domain not in cache:
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ctxt = ssl.create_default_context(purpose = ssl.Purpose.CLIENT_AUTH)
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p_crt, p_key = self._get_cert(domain)
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ctxt.load_cert_chain(str(p_crt), keyfile = str(p_key))
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cache[domain] = ctxt
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socket.context = cache[domain]
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return None
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ssl_context.set_servername_callback(servername_callback)
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return ssl_context
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def _get_cert(self, domain: str) -> Tuple[Path, Path]:
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p_crt = self.cert_dir / '{}'.format(domain)
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p_key = self.cert_dir / '{}'.format(domain)
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if not exists_and_valid(p_crt, p_key):
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raise ssl.CertificateError()
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return p_crt, p_key
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def _get_root_cert(self) -> Tuple[Path, Path]:
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assert self.cert_root is not None
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p_crt = self.cert_dir / '{}'.format(self.cert_root)
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p_key = self.cert_dir / '{}'.format(self.cert_root)
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if not exists_and_valid(p_crt, p_key):
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raise ssl.CertificateError()
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return p_crt, p_key
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def exists_and_valid(p_crt: Path, p_key: Path) -> bool:
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if not p_crt.exists(): return False
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if not p_key.exists(): return False
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backend = default_backend() # type: ignore
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with p_crt.open('rb') as fh:
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crt = x509.load_pem_x509_certificate(fh.read(), backend)
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now = datetime.now(timezone.utc)
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if now < crt.not_valid_before_utc: return False
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near_future = now + timedelta(days = 1)
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if near_future > crt.not_valid_after_utc: return False
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return True |