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import logging
from typing import Iterable, Union
import aiohttp
from asn1crypto import cms, ocsp, x509
from ... import errors
from ...authority import Authority
from ...util import get_ocsp_urls, issuer_serial
from ..api import OCSPFetcher
from ..common_utils import (
format_ocsp_request,
ocsp_job_get_earliest,
process_ocsp_response_data,
)
from .util import AIOHttpMixin, LazySession
logger = logging.getLogger(__name__)
class AIOHttpOCSPFetcher(OCSPFetcher, AIOHttpMixin):
def __init__(
self,
session: Union[aiohttp.ClientSession, LazySession],
user_agent=None,
per_request_timeout=10,
certid_hash_algo='sha1',
request_nonces=True,
):
super().__init__(session, user_agent, per_request_timeout)
if certid_hash_algo not in ('sha1', 'sha256'):
raise ValueError(
f'certid_hash_algo must be one of "sha1", "sha256", not '
f'{repr(certid_hash_algo)}'
)
self.certid_hash_algo = certid_hash_algo
self.request_nonces = request_nonces
async def fetch(
self,
cert: Union[x509.Certificate, cms.AttributeCertificateV2],
authority: Authority,
) -> ocsp.OCSPResponse:
tag = (issuer_serial(cert), authority.hashable)
if isinstance(cert, x509.Certificate):
target = cert.subject.human_friendly
else:
# TODO log audit ID
target = "attribute certificate"
logger.info(f"About to queue OCSP fetch for {target}...")
async def task():
return await self._fetch(cert, authority)
return await self._post_fetch_task(tag, task)
async def _fetch(
self,
cert: Union[x509.Certificate, cms.AttributeCertificateV2],
authority: Authority,
):
ocsp_request = format_ocsp_request(
cert,
authority,
certid_hash_algo=self.certid_hash_algo,
request_nonces=self.request_nonces,
)
# Try the OCSP responders in arbitrary order, and process the responses
# as they come in
ocsp_urls = get_ocsp_urls(cert)
if not ocsp_urls:
raise errors.OCSPFetchError("No URLs to fetch OCSP responses from")
if isinstance(cert, x509.Certificate):
target = cert.subject.human_friendly
else:
# TODO log audit ID
target = "attribute certificate"
logger.info(
f"Fetching OCSP status for {target} from url(s) "
f"{';'.join(ocsp_urls)}..."
)
session = await self.get_session()
fetch_jobs = (
_grab_ocsp(
ocsp_request,
ocsp_url,
user_agent=self.user_agent,
session=session,
timeout=self.per_request_timeout,
)
for ocsp_url in ocsp_urls
)
return await ocsp_job_get_earliest(fetch_jobs)
def fetched_responses(self) -> Iterable[ocsp.OCSPResponse]:
return self.get_results()
def fetched_responses_for_cert(
self, cert: x509.Certificate
) -> Iterable[ocsp.OCSPResponse]:
target_is = issuer_serial(cert)
return {
resp
for (subj_is, _), resp in self._iter_results()
if subj_is == target_is
}
async def _grab_ocsp(
ocsp_request: ocsp.OCSPRequest,
ocsp_url: str,
*,
user_agent,
session: aiohttp.ClientSession,
timeout,
):
try:
logger.info(f"Requesting OCSP response from {ocsp_url}...")
headers = {
'Accept': 'application/ocsp-response',
'Content-Type': 'application/ocsp-request',
'User-Agent': user_agent,
}
cl_timeout = aiohttp.ClientTimeout(total=timeout)
async with session.post(
url=ocsp_url,
headers=headers,
data=ocsp_request.dump(),
raise_for_status=True,
timeout=cl_timeout,
) as response:
response_data = await response.read()
return process_ocsp_response_data(
response_data, ocsp_request=ocsp_request, ocsp_url=ocsp_url
)
except (aiohttp.ClientError, errors.OCSPValidationError) as e:
raise errors.OCSPFetchError(
f"Failed to fetch OCSP response from {ocsp_url}",
) from e
|
