136 lines
5.0 KiB
Python
136 lines
5.0 KiB
Python
# Copyright 2011-2012 OpenStack Foundation
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# All Rights Reserved.
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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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from oslo.config import cfg
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from oslo.serialization import jsonutils
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import webob.exc
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from glance.api import policy
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from glance.common import wsgi
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import glance.context
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import glance.openstack.common.log as logging
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context_opts = [
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cfg.BoolOpt('owner_is_tenant', default=True,
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help=_('When true, this option sets the owner of an image '
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'to be the tenant. Otherwise, the owner of the '
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' image will be the authenticated user issuing the '
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'request.')),
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cfg.StrOpt('admin_role', default='admin',
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help=_('Role used to identify an authenticated user as '
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'administrator.')),
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cfg.BoolOpt('allow_anonymous_access', default=False,
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help=_('Allow unauthenticated users to access the API with '
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'read-only privileges. This only applies when using '
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'ContextMiddleware.')),
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]
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CONF = cfg.CONF
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CONF.register_opts(context_opts)
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LOG = logging.getLogger(__name__)
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class BaseContextMiddleware(wsgi.Middleware):
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def process_response(self, resp):
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try:
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request_id = resp.request.context.request_id
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except AttributeError:
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LOG.warn(_('Unable to retrieve request id from context'))
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else:
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resp.headers['x-openstack-request-id'] = 'req-%s' % request_id
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return resp
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class ContextMiddleware(BaseContextMiddleware):
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def __init__(self, app):
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self.policy_enforcer = policy.Enforcer()
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super(ContextMiddleware, self).__init__(app)
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def process_request(self, req):
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"""Convert authentication information into a request context
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Generate a glance.context.RequestContext object from the available
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authentication headers and store on the 'context' attribute
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of the req object.
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:param req: wsgi request object that will be given the context object
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:raises webob.exc.HTTPUnauthorized: when value of the X-Identity-Status
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header is not 'Confirmed' and
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anonymous access is disallowed
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"""
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if req.headers.get('X-Identity-Status') == 'Confirmed':
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req.context = self._get_authenticated_context(req)
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elif CONF.allow_anonymous_access:
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req.context = self._get_anonymous_context()
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else:
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raise webob.exc.HTTPUnauthorized()
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def _get_anonymous_context(self):
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kwargs = {
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'user': None,
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'tenant': None,
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'roles': [],
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'is_admin': False,
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'read_only': True,
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'policy_enforcer': self.policy_enforcer,
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}
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return glance.context.RequestContext(**kwargs)
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def _get_authenticated_context(self, req):
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# NOTE(bcwaldon): X-Roles is a csv string, but we need to parse
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# it into a list to be useful
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roles_header = req.headers.get('X-Roles', '')
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roles = [r.strip().lower() for r in roles_header.split(',')]
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# NOTE(bcwaldon): This header is deprecated in favor of X-Auth-Token
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deprecated_token = req.headers.get('X-Storage-Token')
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service_catalog = None
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if req.headers.get('X-Service-Catalog') is not None:
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try:
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catalog_header = req.headers.get('X-Service-Catalog')
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service_catalog = jsonutils.loads(catalog_header)
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except ValueError:
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raise webob.exc.HTTPInternalServerError(
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_('Invalid service catalog json.'))
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kwargs = {
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'user': req.headers.get('X-User-Id'),
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'tenant': req.headers.get('X-Tenant-Id'),
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'roles': roles,
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'is_admin': CONF.admin_role.strip().lower() in roles,
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'auth_token': req.headers.get('X-Auth-Token', deprecated_token),
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'owner_is_tenant': CONF.owner_is_tenant,
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'service_catalog': service_catalog,
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'policy_enforcer': self.policy_enforcer,
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}
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return glance.context.RequestContext(**kwargs)
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class UnauthenticatedContextMiddleware(BaseContextMiddleware):
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def process_request(self, req):
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"""Create a context without an authorized user."""
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kwargs = {
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'user': None,
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'tenant': None,
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'roles': [],
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'is_admin': True,
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}
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req.context = glance.context.RequestContext(**kwargs)
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