OpenStack Identity (Keystone)
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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.
# This file handles all flask-restful resources for /v3/credentials
import hashlib
import flask
import http.client
from oslo_serialization import jsonutils
from keystone.common import provider_api
from keystone.common import rbac_enforcer
from keystone.common import validation
import keystone.conf
from keystone.credential import schema
from keystone import exception
from keystone.i18n import _
from keystone.server import flask as ks_flask
CONF = keystone.conf.CONF
PROVIDERS = provider_api.ProviderAPIs
ENFORCER = rbac_enforcer.RBACEnforcer
def _build_target_enforcement():
target = {}
try:
target['credential'] = PROVIDERS.credential_api.get_credential(
flask.request.view_args.get('credential_id')
)
except exception.NotFound: # nosec
# Defer existance in the event the credential doesn't exist, we'll
# check this later anyway.
pass
return target
class CredentialResource(ks_flask.ResourceBase):
collection_key = 'credentials'
member_key = 'credential'
@staticmethod
def _blob_to_json(ref):
# credentials stored via ec2tokens before the fix for #1259584
# need json_serailzing, as that's the documented API format
blob = ref.get('blob')
if isinstance(blob, dict):
ref = ref.copy()
ref['blob'] = jsonutils.dumps(blob)
return ref
def _validate_blob_json(self, ref):
try:
blob = jsonutils.loads(ref.get('blob'))
except (ValueError, TabError):
raise exception.ValidationError(
message=_('Invalid blob in credential'))
if not blob or not isinstance(blob, dict):
raise exception.ValidationError(attribute='blob',
target='credential')
if blob.get('access') is None:
raise exception.ValidationError(attribute='access',
target='credential')
return blob
def _assign_unique_id(
self, ref, trust_id=None, app_cred_id=None, access_token_id=None):
# Generates an assigns a unique identifier to a credential reference.
if ref.get('type', '').lower() == 'ec2':
blob = self._validate_blob_json(ref)
ref = ref.copy()
ref['id'] = hashlib.sha256(
blob['access'].encode('utf8')).hexdigest()
# update the blob with the trust_id or app_cred_id, so credentials
# created with a trust- or app cred-scoped token will result in
# trust- or app cred-scoped tokens when authentication via
# ec2tokens happens
if trust_id is not None:
blob['trust_id'] = trust_id
ref['blob'] = jsonutils.dumps(blob)
if app_cred_id is not None:
blob['app_cred_id'] = app_cred_id
ref['blob'] = jsonutils.dumps(blob)
if access_token_id is not None:
blob['access_token_id'] = access_token_id
ref['blob'] = jsonutils.dumps(blob)
return ref
else:
return super(CredentialResource, self)._assign_unique_id(ref)
def _list_credentials(self):
filters = ['user_id', 'type']
if not self.oslo_context.system_scope:
target = {'credential': {'user_id': self.oslo_context.user_id}}
else:
target = None
ENFORCER.enforce_call(action='identity:list_credentials',
filters=filters, target_attr=target)
hints = self.build_driver_hints(filters)
refs = PROVIDERS.credential_api.list_credentials(hints)
# If the request was filtered, make sure to return only the
# credentials specific to that user. This makes it so that users with
# roles on projects can't see credentials that aren't theirs.
filtered_refs = []
for ref in refs:
# Check each credential again to make sure the user has access to
# it, either by owning it, being a project admin with
# enforce_scope=false, being a system user, or having some other
# custom policy that allows access.
try:
cred = PROVIDERS.credential_api.get_credential(ref['id'])
ENFORCER.enforce_call(
action='identity:get_credential',
target_attr={'credential': cred}
)
filtered_refs.append(ref)
except exception.Forbidden:
pass
refs = filtered_refs
refs = [self._blob_to_json(r) for r in refs]
return self.wrap_collection(refs, hints=hints)
def _get_credential(self, credential_id):
ENFORCER.enforce_call(
action='identity:get_credential',
build_target=_build_target_enforcement
)
credential = PROVIDERS.credential_api.get_credential(credential_id)
return self.wrap_member(self._blob_to_json(credential))
def get(self, credential_id=None):
# Get Credential or List of credentials.
if credential_id is None:
# No Parameter passed means that we're doing a LIST action.
return self._list_credentials()
else:
return self._get_credential(credential_id)
def post(self):
# Create a new credential
credential = self.request_body_json.get('credential', {})
target = {}
target['credential'] = credential
ENFORCER.enforce_call(
action='identity:create_credential', target_attr=target
)
validation.lazy_validate(schema.credential_create, credential)
trust_id = getattr(self.oslo_context, 'trust_id', None)
app_cred_id = getattr(
self.auth_context['token'], 'application_credential_id', None)
access_token_id = getattr(
self.auth_context['token'], 'access_token_id', None)
ref = self._assign_unique_id(
self._normalize_dict(credential),
trust_id=trust_id, app_cred_id=app_cred_id,
access_token_id=access_token_id)
ref = PROVIDERS.credential_api.create_credential(
ref['id'], ref, initiator=self.audit_initiator)
return self.wrap_member(ref), http.client.CREATED
def _validate_blob_update_keys(self, credential, ref):
if credential.get('type', '').lower() == 'ec2':
new_blob = self._validate_blob_json(ref)
old_blob = credential.get('blob')
if isinstance(old_blob, str):
old_blob = jsonutils.loads(old_blob)
# if there was a scope set, prevent changing it or unsetting it
for key in ['trust_id', 'app_cred_id', 'access_token_id']:
if old_blob.get(key) != new_blob.get(key):
message = _('%s can not be updated for credential') % key
raise exception.ValidationError(message=message)
def patch(self, credential_id):
# Update Credential
ENFORCER.enforce_call(
action='identity:update_credential',
build_target=_build_target_enforcement
)
current = PROVIDERS.credential_api.get_credential(credential_id)
credential = self.request_body_json.get('credential', {})
validation.lazy_validate(schema.credential_update, credential)
self._validate_blob_update_keys(current.copy(), credential.copy())
self._require_matching_id(credential)
# Check that the user hasn't illegally modified the owner or scope
target = {'credential': dict(current, **credential)}
ENFORCER.enforce_call(
action='identity:update_credential', target_attr=target
)
ref = PROVIDERS.credential_api.update_credential(
credential_id, credential)
return self.wrap_member(ref)
def delete(self, credential_id):
# Delete credentials
ENFORCER.enforce_call(
action='identity:delete_credential',
build_target=_build_target_enforcement
)
return (PROVIDERS.credential_api.delete_credential(
credential_id, initiator=self.audit_initiator),
http.client.NO_CONTENT)
class CredentialAPI(ks_flask.APIBase):
_name = 'credentials'
_import_name = __name__
resource_mapping = []
resources = [CredentialResource]
APIs = (CredentialAPI,)