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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright (c) 2011 OpenStack Foundation
#
# 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.
"""
Common Auth Middleware.
"""
from oslo.config import cfg
import webob.dec
import webob.exc
from nova import context
from nova.openstack.common import jsonutils
from nova.openstack.common import log as logging
from nova import wsgi
auth_opts = [
cfg.BoolOpt('api_rate_limit',
default=True,
help='whether to rate limit the api'),
cfg.StrOpt('auth_strategy',
default='noauth',
help='The strategy to use for auth: noauth or keystone.'),
cfg.BoolOpt('use_forwarded_for',
default=False,
help='Treat X-Forwarded-For as the canonical remote address. '
'Only enable this if you have a sanitizing proxy.'),
]
CONF = cfg.CONF
CONF.register_opts(auth_opts)
LOG = logging.getLogger(__name__)
def pipeline_factory(loader, global_conf, **local_conf):
"""A paste pipeline replica that keys off of auth_strategy."""
pipeline = local_conf[CONF.auth_strategy]
if not CONF.api_rate_limit:
limit_name = CONF.auth_strategy + '_nolimit'
pipeline = local_conf.get(limit_name, pipeline)
pipeline = pipeline.split()
filters = [loader.get_filter(n) for n in pipeline[:-1]]
app = loader.get_app(pipeline[-1])
filters.reverse()
for filter in filters:
app = filter(app)
return app
class InjectContext(wsgi.Middleware):
"""Add a 'nova.context' to WSGI environ."""
def __init__(self, context, *args, **kwargs):
self.context = context
super(InjectContext, self).__init__(*args, **kwargs)
@webob.dec.wsgify(RequestClass=wsgi.Request)
def __call__(self, req):
req.environ['nova.context'] = self.context
return self.application
class NovaKeystoneContext(wsgi.Middleware):
"""Make a request context from keystone headers."""
@webob.dec.wsgify(RequestClass=wsgi.Request)
def __call__(self, req):
user_id = req.headers.get('X_USER')
user_id = req.headers.get('X_USER_ID', user_id)
if user_id is None:
LOG.debug("Neither X_USER_ID nor X_USER found in request")
return webob.exc.HTTPUnauthorized()
roles = self._get_roles(req)
if 'X_TENANT_ID' in req.headers:
# This is the new header since Keystone went to ID/Name
project_id = req.headers['X_TENANT_ID']
else:
# This is for legacy compatibility
project_id = req.headers['X_TENANT']
project_name = req.headers.get('X_TENANT_NAME')
user_name = req.headers.get('X_USER_NAME')
# Get the auth token
auth_token = req.headers.get('X_AUTH_TOKEN',
req.headers.get('X_STORAGE_TOKEN'))
# Build a context, including the auth_token...
remote_address = req.remote_addr
if CONF.use_forwarded_for:
remote_address = req.headers.get('X-Forwarded-For', remote_address)
service_catalog = None
if req.headers.get('X_SERVICE_CATALOG') is not None:
try:
catalog_header = req.headers.get('X_SERVICE_CATALOG')
service_catalog = jsonutils.loads(catalog_header)
except ValueError:
raise webob.exc.HTTPInternalServerError(
_('Invalid service catalog json.'))
ctx = context.RequestContext(user_id,
project_id,
user_name=user_name,
project_name=project_name,
roles=roles,
auth_token=auth_token,
remote_address=remote_address,
service_catalog=service_catalog)
req.environ['nova.context'] = ctx
return self.application
def _get_roles(self, req):
"""Get the list of roles."""
if 'X_ROLES' in req.headers:
roles = req.headers.get('X_ROLES', '')
else:
# Fallback to deprecated role header:
roles = req.headers.get('X_ROLE', '')
if roles:
LOG.warn(_("Sourcing roles from deprecated X-Role HTTP "
"header"))
return [r.strip() for r in roles.split(',')]
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