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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import datetime
import logging
import os
from oslo_serialization import jsonutils
from oslo_utils import timeutils
from keystonemiddleware.auth_token import _exceptions as exc
from keystonemiddleware.i18n import _
_LOG = logging.getLogger(__name__)
class Revocations(object):
_FILE_NAME = 'revoked.pem'
def __init__(self, timeout, signing_directory, identity_server,
cms_verify, log=_LOG):
self._cache_timeout = timeout
self._signing_directory = signing_directory
self._identity_server = identity_server
self._cms_verify = cms_verify
self._log = log
self._fetched_time_prop = None
self._list_prop = None
@property
def _fetched_time(self):
if not self._fetched_time_prop:
# If the fetched list has been written to disk, use its
# modification time.
file_path = self._signing_directory.calc_path(self._FILE_NAME)
if os.path.exists(file_path):
mtime = os.path.getmtime(file_path)
fetched_time = datetime.datetime.utcfromtimestamp(mtime)
# Otherwise the list will need to be fetched.
else:
fetched_time = datetime.datetime.min
self._fetched_time_prop = fetched_time
return self._fetched_time_prop
@_fetched_time.setter
def _fetched_time(self, value):
self._fetched_time_prop = value
def _fetch(self):
revocation_list_data = self._identity_server.fetch_revocation_list()
return self._cms_verify(revocation_list_data)
@property
def _list(self):
timeout = self._fetched_time + self._cache_timeout
list_is_current = timeutils.utcnow() < timeout
if list_is_current:
# Load the list from disk if required
if not self._list_prop:
self._list_prop = jsonutils.loads(
self._signing_directory.read_file(self._FILE_NAME))
else:
self._list = self._fetch()
return self._list_prop
@_list.setter
def _list(self, value):
"""Save a revocation list to memory and to disk.
:param value: A json-encoded revocation list
"""
self._list_prop = jsonutils.loads(value)
self._fetched_time = timeutils.utcnow()
self._signing_directory.write_file(self._FILE_NAME, value)
def _is_revoked(self, token_id):
"""Indicate whether the token_id appears in the revocation list."""
revoked_tokens = self._list.get('revoked', None)
if not revoked_tokens:
return False
revoked_ids = (x['id'] for x in revoked_tokens)
return token_id in revoked_ids
def _any_revoked(self, token_ids):
for token_id in token_ids:
if self._is_revoked(token_id):
return True
return False
def check(self, token_ids):
if self._any_revoked(token_ids):
self._log.debug('Token is marked as having been revoked')
raise exc.InvalidToken(_('Token has been revoked'))
def check_by_audit_id(self, audit_ids):
"""Check whether the audit_id appears in the revocation list.
:raises keystonemiddleware.auth_token._exceptions.InvalidToken:
if the audit ID(s) appear in the revocation list.
"""
revoked_tokens = self._list.get('revoked', None)
if not revoked_tokens:
# There's no revoked tokens, so nothing to do.
return
# The audit_id may not be present in the revocation events because
# earlier versions of the identity server didn't provide them.
revoked_ids = set(
x['audit_id'] for x in revoked_tokens if 'audit_id' in x)
for audit_id in audit_ids:
if audit_id in revoked_ids:
self._log.debug(
'Token is marked as having been revoked by audit id')
raise exc.InvalidToken(_('Token has been revoked'))
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