keystone.middleware.auth

Source code for keystone.middleware.auth

# 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.

from keystonemiddleware import auth_token
from oslo_log import log

from keystone.common import authorization
from keystone.common import context
from keystone.common import controller
from keystone.common import provider_api
from keystone.common import tokenless_auth
from keystone.common import wsgi
import keystone.conf
from keystone import exception
from keystone.federation import constants as federation_constants
from keystone.federation import utils
from keystone.i18n import _
from keystone.models import token_model

CONF = keystone.conf.CONF
LOG = log.getLogger(__name__)
PROVIDERS = provider_api.ProviderAPIs

__all__ = ('AuthContextMiddleware',)


[docs]class AuthContextMiddleware(provider_api.ProviderAPIMixin, auth_token.BaseAuthProtocol): """Build the authentication context from the request auth token.""" kwargs_to_fetch_token = True def __init__(self, app): super(AuthContextMiddleware, self).__init__(app, log=LOG)
[docs] def fetch_token(self, token, **kwargs): try: token_model = self.token_provider_api.validate_token(token) return controller.render_token_response_from_model(token_model) except exception.TokenNotFound: raise auth_token.InvalidToken(_('Could not find token'))
def _build_tokenless_auth_context(self, request): """Build the authentication context. The context is built from the attributes provided in the env, such as certificate and scope attributes. """ tokenless_helper = tokenless_auth.TokenlessAuthHelper(request.environ) (domain_id, project_id, trust_ref, unscoped, system) = ( tokenless_helper.get_scope()) user_ref = tokenless_helper.get_mapped_user( project_id, domain_id) # NOTE(gyee): if it is an ephemeral user, the # given X.509 SSL client cert does not need to map to # an existing user. if user_ref['type'] == utils.UserType.EPHEMERAL: auth_context = {} auth_context['group_ids'] = user_ref['group_ids'] auth_context[federation_constants.IDENTITY_PROVIDER] = ( user_ref[federation_constants.IDENTITY_PROVIDER]) auth_context[federation_constants.PROTOCOL] = ( user_ref[federation_constants.PROTOCOL]) if domain_id and project_id: msg = _('Scoping to both domain and project is not allowed') raise ValueError(msg) if domain_id: auth_context['domain_id'] = domain_id if project_id: auth_context['project_id'] = project_id auth_context['roles'] = user_ref['roles'] else: # it's the local user, so token data is needed. token = token_model.TokenModel() token.user_id = user_ref['id'] token.methods = [CONF.tokenless_auth.protocol] token.domain_id = domain_id token.project_id = project_id auth_context = {'user_id': user_ref['id']} auth_context['is_delegated_auth'] = False if domain_id: auth_context['domain_id'] = domain_id if project_id: auth_context['project_id'] = project_id auth_context['roles'] = [role['name'] for role in token.roles] return auth_context def _validate_trusted_issuer(self, request): """To further filter the certificates that are trusted. If the config option 'trusted_issuer' is absent or does not contain the trusted issuer DN, no certificates will be allowed in tokenless authorization. :param env: The env contains the client issuer's attributes :type env: dict :returns: True if client_issuer is trusted; otherwise False """ if not CONF.tokenless_auth.trusted_issuer: return False issuer = request.environ.get(CONF.tokenless_auth.issuer_attribute) if not issuer: msg = ('Cannot find client issuer in env by the ' 'issuer attribute - %s.') LOG.info(msg, CONF.tokenless_auth.issuer_attribute) return False if issuer in CONF.tokenless_auth.trusted_issuer: return True msg = ('The client issuer %(client_issuer)s does not match with ' 'the trusted issuer %(trusted_issuer)s') LOG.info( msg, {'client_issuer': issuer, 'trusted_issuer': CONF.tokenless_auth.trusted_issuer}) return False
[docs] @wsgi.middleware_exceptions def process_request(self, request): context_env = request.environ.get(wsgi.CONTEXT_ENV, {}) # NOTE(notmorgan): This code is merged over from the admin token # middleware and now emits the security warning when the # conf.admin_token value is set. token = request.headers.get(authorization.AUTH_TOKEN_HEADER) if CONF.admin_token and (token == CONF.admin_token): context_env['is_admin'] = True LOG.warning( "The use of the '[DEFAULT] admin_token' configuration" "option presents a significant security risk and should " "not be set. This option is deprecated in favor of using " "'keystone-manage bootstrap' and will be removed in a " "future release.") request.environ[wsgi.CONTEXT_ENV] = context_env if not context_env.get('is_admin', False): resp = super(AuthContextMiddleware, self).process_request(request) if resp: return resp if request.token_auth.user is not None: request.set_user_headers(request.token_auth.user) # NOTE(jamielennox): function is split so testing can check errors from # fill_context. There is no actual reason for fill_context to raise # errors rather than return a resp, simply that this is what happened # before refactoring and it was easier to port. This can be fixed up # and the middleware_exceptions helper removed. self.fill_context(request)
def _keystone_specific_values(self, token, request_context): if token.domain_scoped: # Domain scoped tokens should never have is_admin_project set # Even if KSA defaults it otherwise. The two mechanisms are # parallel; only ione or the other should be used for access. request_context.is_admin_project = False request_context.domain_id = token.domain_id request_context.domain_name = token.domain['name'] if token.oauth_scoped: request_context.is_delegated_auth = True request_context.oauth_consumer_id = ( token.access_token['consumer_id'] ) request_context.oauth_access_token_id = token.access_token_id if token.trust_scoped: request_context.is_delegated_auth = True request_context.trust_id = token.trust_id if token.is_federated: request_context.group_ids = [] for group in token.federated_groups: request_context.group_ids.append(group['id']) else: request_context.group_ids = []
[docs] def fill_context(self, request): # The request context stores itself in thread-local memory for logging. if authorization.AUTH_CONTEXT_ENV in request.environ: msg = ('Auth context already exists in the request ' 'environment; it will be used for authorization ' 'instead of creating a new one.') LOG.warning(msg) return kwargs = { 'authenticated': False, 'overwrite': True} request_context = context.RequestContext.from_environ( request.environ, **kwargs) request.environ[context.REQUEST_CONTEXT_ENV] = request_context # NOTE(gyee): token takes precedence over SSL client certificates. # This will preserve backward compatibility with the existing # behavior. Tokenless authorization with X.509 SSL client # certificate is effectively disabled if no trusted issuers are # provided. if request.environ.get(wsgi.CONTEXT_ENV, {}).get('is_admin', False): request_context.is_admin = True auth_context = {} elif request.token_auth.has_user_token: # Keystone enforces policy on some values that other services # do not, and should not, use. This adds them in to the context. token = PROVIDERS.token_provider_api.validate_token( request.user_token ) self._keystone_specific_values(token, request_context) request_context.auth_token = request.user_token auth_context = request_context.to_policy_values() additional = { 'trust_id': request_context.trust_id, 'trustor_id': request_context.trustor_id, 'trustee_id': request_context.trustee_id, 'domain_id': request_context._domain_id, 'domain_name': request_context.domain_name, 'group_ids': request_context.group_ids, 'token': token } auth_context.update(additional) elif self._validate_trusted_issuer(request): auth_context = self._build_tokenless_auth_context(request) else: # There is either no auth token in the request or the certificate # issuer is not trusted. No auth context will be set. This # typically happens on an initial token request. return # set authenticated to flag to keystone that a token has been validated request_context.authenticated = True LOG.debug('RBAC: auth_context: %s', auth_context) request.environ[authorization.AUTH_CONTEXT_ENV] = auth_context
[docs] @classmethod def factory(cls, global_config, **local_config): """Used for loading in middleware (holdover from paste.deploy).""" def _factory(app): conf = global_config.copy() conf.update(local_config) return cls(app, **local_config) return _factory
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