Source code for keystone.token.providers.jws.core
# 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 os
import jwt
from oslo_utils import timeutils
from keystone.common import utils
import keystone.conf
from keystone import exception
from keystone.i18n import _
from keystone.token.providers import base
CONF = keystone.conf.CONF
[docs]class Provider(base.Provider):
def __init__(self, *args, **kwargs):
super(Provider, self).__init__(*args, **kwargs)
# NOTE(lbragstad): We add these checks here because if the jws
# provider is going to be used and either the `key_repository` is empty
# or doesn't exist we should fail, hard. It doesn't make sense to start
# keystone and just 500 because we can't do anything with an empty or
# non-existant key repository.
private_key = os.path.join(
CONF.jwt_tokens.jws_private_key_repository, 'private.pem'
)
public_key_repo = CONF.jwt_tokens.jws_public_key_repository
if not os.path.exists(private_key):
subs = {'private_key': private_key}
raise SystemExit(_(
'%(private_key)s does not exist. You can generate a key pair '
'using `keystone-manage create_jws_keypair`.') % subs)
if not os.path.exists(public_key_repo):
subs = {'public_key_repo': public_key_repo}
raise SystemExit(_(
'%(public_key_repo)s does not exist. Please make sure the '
'directory exists and is readable by the process running '
'keystone.') % subs)
if len(os.listdir(public_key_repo)) == 0:
subs = {'public_key_repo': public_key_repo}
msg = _(
'%(public_key_repo)s must contain at least one public '
'key but it is empty. You can generate a key pair using '
'`keystone-manage create_jws_keypair`.'
)
raise SystemExit(msg % subs)
self.token_formatter = JWSFormatter()
[docs] def generate_id_and_issued_at(self, token):
return self.token_formatter.create_token(
token.user_id, token.expires_at, token.audit_ids, token.methods,
system=token.system, domain_id=token.domain_id,
project_id=token.project_id, trust_id=token.trust_id,
federated_group_ids=token.federated_groups,
identity_provider_id=token.identity_provider_id,
protocol_id=token.protocol_id,
access_token_id=token.access_token_id,
app_cred_id=token.application_credential_id
)
[docs]class JWSFormatter(object):
# NOTE(lbragstad): If in the future we expand support for different
# algorithms, make this configurable and validate it against a blessed list
# of supported algorithms.
algorithm = 'ES256'
@property
def private_key(self):
private_key_path = os.path.join(
CONF.jwt_tokens.jws_private_key_repository, 'private.pem'
)
with open(private_key_path, 'r') as f:
key = f.read()
return key
@property
def public_keys(self):
keys = []
key_repo = CONF.jwt_tokens.jws_public_key_repository
for keyfile in os.listdir(key_repo):
with open(os.path.join(key_repo, keyfile), 'r') as f:
keys.append(f.read())
return keys
[docs] def create_token(self, user_id, expires_at, audit_ids, methods,
system=None, domain_id=None, project_id=None,
trust_id=None, federated_group_ids=None,
identity_provider_id=None, protocol_id=None,
access_token_id=None, app_cred_id=None):
issued_at = utils.isotime(subsecond=True)
issued_at_int = self._convert_time_string_to_int(issued_at)
expires_at_int = self._convert_time_string_to_int(expires_at)
payload = {
# public claims
'sub': user_id,
'iat': issued_at_int,
'exp': expires_at_int,
# private claims
'openstack_methods': methods,
'openstack_audit_ids': audit_ids,
'openstack_system': system,
'openstack_domain_id': domain_id,
'openstack_project_id': project_id,
'openstack_trust_id': trust_id,
'openstack_group_ids': federated_group_ids,
'openstack_idp_id': identity_provider_id,
'openstack_protocol_id': protocol_id,
'openstack_access_token_id': access_token_id,
'openstack_app_cred_id': app_cred_id
}
# NOTE(lbragstad): Calling .items() on a dictionary in python 2 returns
# a list but returns an iterable in python 3. Casting to a list makes
# it safe to modify the dictionary while iterating over it, regardless
# of the python version.
for k, v in list(payload.items()):
if v is None:
payload.pop(k)
token_id = jwt.encode(
payload,
self.private_key,
algorithm=JWSFormatter.algorithm
)
return token_id, issued_at
[docs] def validate_token(self, token_id):
payload = self._decode_token_from_id(token_id)
user_id = payload['sub']
expires_at_int = payload['exp']
issued_at_int = payload['iat']
methods = payload['openstack_methods']
audit_ids = payload['openstack_audit_ids']
system = payload.get('openstack_system', None)
domain_id = payload.get('openstack_domain_id', None)
project_id = payload.get('openstack_project_id', None)
trust_id = payload.get('openstack_trust_id', None)
federated_group_ids = payload.get('openstack_group_ids', None)
identity_provider_id = payload.get('openstack_idp_id', None)
protocol_id = payload.get('openstack_protocol_id', None)
access_token_id = payload.get('openstack_access_token_id', None)
app_cred_id = payload.get('openstack_app_cred_id', None)
issued_at = self._convert_time_int_to_string(issued_at_int)
expires_at = self._convert_time_int_to_string(expires_at_int)
return (
user_id, methods, audit_ids, system, domain_id, project_id,
trust_id, federated_group_ids, identity_provider_id, protocol_id,
access_token_id, app_cred_id, issued_at, expires_at
)
def _decode_token_from_id(self, token_id):
for public_key in self.public_keys:
try:
return jwt.decode(
token_id, public_key, algorithms=JWSFormatter.algorithm
)
except (jwt.InvalidSignatureError, jwt.DecodeError,
jwt.ExpiredSignatureError):
pass # nosec: We want to exhaustively try all public keys
raise exception.TokenNotFound(token_id=token_id)
def _convert_time_string_to_int(self, time_str):
time_object = timeutils.parse_isotime(time_str)
normalized = timeutils.normalize_time(time_object)
epoch = datetime.datetime.utcfromtimestamp(0)
return int((normalized - epoch).total_seconds())
def _convert_time_int_to_string(self, time_int):
time_object = datetime.datetime.utcfromtimestamp(time_int)
return utils.isotime(at=time_object, subsecond=True)
