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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 logging
from django.conf import settings
from django.utils.translation import ugettext_lazy as _
from keystoneauth1.identity import v3 as v3_auth
from openstack_auth import exceptions
from openstack_auth.plugin import base
from openstack_auth import utils
LOG = logging.getLogger(__name__)
__all__ = ['K2KAuthPlugin']
class K2KAuthPlugin(base.BasePlugin):
def get_plugin(self, service_provider=None, auth_url=None, plugins=[],
**kwargs):
"""Authenticate using keystone to keystone federation.
This plugin uses other v3 plugins to authenticate a user to a
identity provider in order to authenticate the user to a service
provider
:param service_provider: service provider ID
:param auth_url: Keystone auth url
:param plugins: list of openstack_auth plugins to check
:returns Keystone2Keystone keystone auth plugin
"""
# service_provider being None prevents infinite recursion
if utils.get_keystone_version() < 3 or not service_provider:
return None
keystone_idp_id = getattr(settings, 'KEYSTONE_PROVIDER_IDP_ID',
'localkeystone')
if service_provider == keystone_idp_id:
return None
for plugin in plugins:
unscoped_idp_auth = plugin.get_plugin(plugins=plugins,
auth_url=auth_url, **kwargs)
if unscoped_idp_auth:
break
else:
LOG.debug('Could not find base authentication backend for '
'K2K plugin with the provided credentials.')
return None
idp_exception = None
scoped_idp_auth = None
unscoped_auth_ref = base.BasePlugin.get_access_info(
self, unscoped_idp_auth)
try:
scoped_idp_auth, __ = self.get_project_scoped_auth(
unscoped_idp_auth, unscoped_auth_ref)
except exceptions.KeystoneAuthException as idp_excp:
idp_exception = idp_excp
if not scoped_idp_auth or idp_exception:
msg = 'Identity provider authentication Failed.'
raise exceptions.KeystoneAuthException(msg)
session = utils.get_session()
if scoped_idp_auth.get_sp_auth_url(session, service_provider) is None:
msg = _('Could not find service provider ID on Keystone.')
raise exceptions.KeystoneAuthException(msg)
unscoped_auth = v3_auth.Keystone2Keystone(
base_plugin=scoped_idp_auth,
service_provider=service_provider)
return unscoped_auth
def get_access_info(self, unscoped_auth):
"""Get the access info object
We attempt to get the auth ref. If it fails and if the K2K auth plugin
was being used then we will prepend a message saying that the error was
on the service provider side.
:param: unscoped_auth: Keystone auth plugin for unscoped user
:returns: keystoneclient.access.AccessInfo object
"""
try:
unscoped_auth_ref = base.BasePlugin.get_access_info(
self, unscoped_auth)
except exceptions.KeystoneAuthException as excp:
msg = _('Service provider authentication failed. %s')
raise exceptions.KeystoneAuthException(msg % str(excp))
return unscoped_auth_ref
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