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