102 lines
3.5 KiB
Python
102 lines
3.5 KiB
Python
# Copyright 2013 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Keystone External Authentication Plugins."""
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import abc
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from oslo_config import cfg
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import six
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from keystone import auth
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from keystone.common import dependency
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from keystone import exception
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from keystone.i18n import _
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CONF = cfg.CONF
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@six.add_metaclass(abc.ABCMeta)
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class Base(auth.AuthMethodHandler):
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def authenticate(self, context, auth_info, auth_context):
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"""Use REMOTE_USER to look up the user in the identity backend.
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auth_context is an in-out variable that will be updated with the
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user_id from the actual user from the REMOTE_USER env variable.
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"""
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try:
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REMOTE_USER = context['environment']['REMOTE_USER']
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except KeyError:
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msg = _('No authenticated user')
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raise exception.Unauthorized(msg)
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try:
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user_ref = self._authenticate(REMOTE_USER, context)
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auth_context['user_id'] = user_ref['id']
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if ('kerberos' in CONF.token.bind and
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(context['environment'].get('AUTH_TYPE', '').lower()
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== 'negotiate')):
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auth_context['bind']['kerberos'] = user_ref['name']
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except Exception:
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msg = _('Unable to lookup user %s') % (REMOTE_USER)
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raise exception.Unauthorized(msg)
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@abc.abstractmethod
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def _authenticate(self, remote_user, context):
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"""Look up the user in the identity backend.
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Return user_ref
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"""
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pass
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@dependency.requires('identity_api')
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class DefaultDomain(Base):
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def _authenticate(self, remote_user, context):
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"""Use remote_user to look up the user in the identity backend."""
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domain_id = CONF.identity.default_domain_id
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user_ref = self.identity_api.get_user_by_name(remote_user, domain_id)
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return user_ref
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@dependency.requires('identity_api', 'resource_api')
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class Domain(Base):
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def _authenticate(self, remote_user, context):
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"""Use remote_user to look up the user in the identity backend.
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The domain will be extracted from the REMOTE_DOMAIN environment
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variable if present. If not, the default domain will be used.
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"""
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username = remote_user
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try:
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domain_name = context['environment']['REMOTE_DOMAIN']
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except KeyError:
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domain_id = CONF.identity.default_domain_id
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else:
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domain_ref = self.resource_api.get_domain_by_name(domain_name)
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domain_id = domain_ref['id']
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user_ref = self.identity_api.get_user_by_name(username, domain_id)
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return user_ref
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class KerberosDomain(Domain):
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"""Allows `kerberos` as a method."""
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def _authenticate(self, remote_user, context):
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auth_type = context['environment'].get('AUTH_TYPE')
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if auth_type != 'Negotiate':
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raise exception.Unauthorized(_("auth_type is not Negotiate"))
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return super(KerberosDomain, self)._authenticate(remote_user, context)
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