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https://github.com/pypa/pip
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67 lines
2.3 KiB
Python
67 lines
2.3 KiB
Python
import contextlib
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import os
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import re
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import ssl
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import typing
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# candidates based on https://github.com/tiran/certifi-system-store by Christian Heimes
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_CA_FILE_CANDIDATES = [
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# Alpine, Arch, Fedora 34+, OpenWRT, RHEL 9+, BSD
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"/etc/ssl/cert.pem",
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# Fedora <= 34, RHEL <= 9, CentOS <= 9
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"/etc/pki/tls/cert.pem",
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# Debian, Ubuntu (requires ca-certificates)
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"/etc/ssl/certs/ca-certificates.crt",
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# SUSE
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"/etc/ssl/ca-bundle.pem",
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]
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_HASHED_CERT_FILENAME_RE = re.compile(r"^[0-9a-fA-F]{8}\.[0-9]$")
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@contextlib.contextmanager
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def _configure_context(ctx: ssl.SSLContext) -> typing.Iterator[None]:
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# First, check whether the default locations from OpenSSL
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# seem like they will give us a usable set of CA certs.
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# ssl.get_default_verify_paths already takes care of:
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# - getting cafile from either the SSL_CERT_FILE env var
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# or the path configured when OpenSSL was compiled,
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# and verifying that that path exists
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# - getting capath from either the SSL_CERT_DIR env var
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# or the path configured when OpenSSL was compiled,
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# and verifying that that path exists
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# In addition we'll check whether capath appears to contain certs.
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defaults = ssl.get_default_verify_paths()
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if defaults.cafile or (defaults.capath and _capath_contains_certs(defaults.capath)):
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ctx.set_default_verify_paths()
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else:
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# cafile from OpenSSL doesn't exist
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# and capath from OpenSSL doesn't contain certs.
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# Let's search other common locations instead.
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for cafile in _CA_FILE_CANDIDATES:
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if os.path.isfile(cafile):
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ctx.load_verify_locations(cafile=cafile)
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break
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yield
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def _capath_contains_certs(capath: str) -> bool:
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"""Check whether capath exists and contains certs in the expected format."""
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if not os.path.isdir(capath):
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return False
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for name in os.listdir(capath):
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if _HASHED_CERT_FILENAME_RE.match(name):
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return True
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return False
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def _verify_peercerts_impl(
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ssl_context: ssl.SSLContext,
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cert_chain: list[bytes],
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server_hostname: str | None = None,
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) -> None:
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# This is a no-op because we've enabled SSLContext's built-in
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# verification via verify_mode=CERT_REQUIRED, and don't need to repeat it.
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pass
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