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from datetime import datetime
from typing import Dict, Iterable, List, Optional, Set
from asn1crypto import crl, ocsp, x509
from pyhanko_certvalidator.authority import Authority
from pyhanko_certvalidator.errors import OCSPFetchError
from pyhanko_certvalidator.fetchers import Fetchers
from pyhanko_certvalidator.ltv.poe import (
KnownPOE,
POEManager,
POEType,
ValidationObject,
ValidationObjectType,
digest_for_poe,
)
from pyhanko_certvalidator.policy_decl import NonRevokedStatusAssertion
from pyhanko_certvalidator.registry import CertificateRegistry
from pyhanko_certvalidator.revinfo.archival import (
CRLContainer,
OCSPContainer,
sort_freshest_first,
)
class RevinfoManager:
"""
.. versionadded:: 0.20.0
Class to manage and potentially fetch revocation information.
:param certificate_registry:
The associated certificate registry.
:param poe_manager:
The proof-of-existence (POE) data manager.
:param crls:
CRL data.
:param ocsps:
OCSP response data.
:param fetchers:
Fetchers for collecting revocation information.
If ``None``, no fetching will be performed.
"""
def __init__(
self,
certificate_registry: CertificateRegistry,
poe_manager: POEManager,
crls: Iterable[CRLContainer],
ocsps: Iterable[OCSPContainer],
assertions: Iterable[NonRevokedStatusAssertion] = (),
fetchers: Optional[Fetchers] = None,
):
self._certificate_registry = certificate_registry
self._poe_manager = poe_manager
self._revocation_certs: Dict[bytes, x509.Certificate] = {}
self._crl_issuer_map: Dict[bytes, x509.Certificate] = {}
self._crls: List[CRLContainer] = []
if crls:
self._crls = sort_freshest_first(crls)
self._ocsps: List[OCSPContainer] = []
if ocsps:
self._ocsps = ocsps = sort_freshest_first(ocsps)
for ocsp_response in ocsps:
self._extract_ocsp_certs(ocsp_response)
self._fetchers = fetchers
self._assertions: Dict[bytes, NonRevokedStatusAssertion] = {
assertion.cert_sha256: assertion for assertion in assertions
}
@property
def poe_manager(self) -> POEManager:
"""
The proof-of-existence (POE) data manager.
"""
return self._poe_manager
@property
def certificate_registry(self) -> CertificateRegistry:
"""
The associated certificate registry.
"""
return self._certificate_registry
@property
def fetching_allowed(self) -> bool:
"""
Boolean indicating whether fetching is allowed.
"""
return self._fetchers is not None
@property
def crls(self) -> List[crl.CertificateList]:
"""
A list of all cached :class:`crl.CertificateList` objects
"""
raw_crls = [cont.crl_data for cont in self._crls]
if not self._fetchers:
return raw_crls
return list(self._fetchers.crl_fetcher.fetched_crls()) + raw_crls
@property
def ocsps(self) -> List[ocsp.OCSPResponse]:
"""
A list of all cached :class:`ocsp.OCSPResponse` objects
"""
raw_ocsps = [cont.ocsp_response_data for cont in self._ocsps]
if not self._fetchers:
return raw_ocsps
return list(self._fetchers.ocsp_fetcher.fetched_responses()) + raw_ocsps
@property
def new_revocation_certs(self) -> List[x509.Certificate]:
"""
A list of newly-fetched :class:`x509.Certificate` objects that were
obtained from OCSP responses and CRLs
"""
return list(self._revocation_certs.values())
def _extract_ocsp_certs(self, ocsp_response: OCSPContainer):
"""
Extracts any certificates included with an OCSP response and adds them
to the certificate registry
:param ocsp_response:
An asn1crypto.ocsp.OCSPResponse object to look for certs inside of
"""
poe_man = self._poe_manager
ocsp_poe_time = poe_man[ocsp_response]
registry = self._certificate_registry
revo_certs = self._revocation_certs
basic = ocsp_response.extract_basic_ocsp_response()
if basic is not None and basic['certs']:
for other_cert in basic['certs']:
if registry.register(other_cert):
revo_certs[other_cert.issuer_serial] = other_cert
poe_man.register_known_poe(
KnownPOE(
poe_type=POEType.VALIDATION,
digest=digest_for_poe(other_cert.dump()),
# register with the same POE time as the OCSP
# response
poe_time=ocsp_poe_time,
validation_object=ValidationObject(
object_type=ValidationObjectType.CERTIFICATE,
value=other_cert,
),
)
)
def record_crl_issuer(self, certificate_list, cert):
"""
Records the certificate that issued a certificate list. Used to reduce
processing code when dealing with self-issued certificates and multiple
CRLs.
:param certificate_list:
An ans1crypto.crl.CertificateList object
:param cert:
An ans1crypto.x509.Certificate object
"""
self._crl_issuer_map[certificate_list.signature] = cert
def check_crl_issuer(self, certificate_list) -> Optional[x509.Certificate]:
"""
Checks to see if the certificate that signed a certificate list has
been found
:param certificate_list:
An ans1crypto.crl.CertificateList object
:return:
None if not found, or an asn1crypto.x509.Certificate object of the
issuer
"""
return self._crl_issuer_map.get(certificate_list.signature)
async def async_retrieve_crls(self, cert) -> List[CRLContainer]:
"""
.. versionadded:: 0.20.0
:param cert:
An asn1crypto.x509.Certificate object
:return:
A list of :class:`CRLContainer` objects
"""
if not self._fetchers:
return self._crls
fetchers = self._fetchers
try:
crls = fetchers.crl_fetcher.fetched_crls_for_cert(cert)
except KeyError:
crls = await fetchers.crl_fetcher.fetch(cert)
conts = [CRLContainer(crl_data) for crl_data in crls]
return conts + self._crls
async def async_retrieve_ocsps(
self, cert, authority: Authority
) -> List[OCSPContainer]:
"""
.. versionadded:: 0.20.0
:param cert:
An asn1crypto.x509.Certificate object
:param authority:
The issuing authority for the certificate
:return:
A list of :class:`OCSPContainer` objects
"""
if not self._fetchers:
return self._ocsps
fetchers = self._fetchers
ocsps = [
OCSPContainer(resp)
for resp in fetchers.ocsp_fetcher.fetched_responses_for_cert(cert)
]
if not ocsps:
ocsp_response_data = await fetchers.ocsp_fetcher.fetch(
cert, authority
)
ocsps = OCSPContainer.load_multi(ocsp_response_data)
# Responses can contain certificates that are useful in
# validating the response itself. We can use these since they
# will be validated using the local trust roots.
for resp in ocsps:
try:
self._extract_ocsp_certs(resp)
except ValueError:
raise OCSPFetchError(
"Failed to extract certificates from "
"fetched OCSP response"
)
return ocsps + self._ocsps
def evict_ocsps(self, hashes_to_evict: Set[bytes]):
"""
Internal API to eliminate local OCSP records from consideration.
:param hashes_to_evict:
A collection of OCSP response hashes; see :func:`.digest_for_poe`.
"""
def p(container: OCSPContainer):
digest = digest_for_poe(container.ocsp_response_data.dump())
return digest not in hashes_to_evict
self._ocsps = list(filter(p, self._ocsps))
def evict_crls(self, hashes_to_evict: Set[bytes]):
"""
Internal API to eliminate local CRLs from consideration.
:param hashes_to_evict:
A collection of CRL hashes; see :func:`.digest_for_poe`.
"""
def p(container: CRLContainer):
digest = digest_for_poe(container.crl_data.dump())
return digest not in hashes_to_evict
self._crls = list(filter(p, self._crls))
def check_asserted_unrevoked(
self, cert: x509.Certificate, at: datetime
) -> bool:
try:
return at <= self._assertions[cert.sha256].at
except KeyError:
return False
|
