143 lines
5.0 KiB
Python
143 lines
5.0 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 2011 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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"""
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Common Auth Middleware.
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"""
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from oslo_config import cfg
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from oslo_log import log as logging
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from oslo_serialization import jsonutils
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import webob.dec
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import webob.exc
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from gceapi import context
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from gceapi.i18n import _
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from gceapi import wsgi
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auth_opts = [
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cfg.BoolOpt('api_rate_limit',
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default=False,
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help='whether to use per-user rate limiting for the api.'),
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cfg.StrOpt('auth_strategy',
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default='keystone',
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help='The strategy to use for auth: keystone only for now.'),
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cfg.BoolOpt('use_forwarded_for',
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default=False,
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help='Treat X-Forwarded-For as the canonical remote address. '
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'Only enable this if you have a sanitizing proxy.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(auth_opts)
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LOG = logging.getLogger(__name__)
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def pipeline_factory(loader, global_conf, **local_conf):
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"""A paste pipeline replica that keys off of auth_strategy."""
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pipeline = local_conf[CONF.auth_strategy]
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if not CONF.api_rate_limit:
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limit_name = CONF.auth_strategy + '_nolimit'
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pipeline = local_conf.get(limit_name, pipeline)
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pipeline = pipeline.split()
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filters = [loader.get_filter(n) for n in pipeline[:-1]]
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app = loader.get_app(pipeline[-1])
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filters.reverse()
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for filter_func in filters:
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app = filter_func(app)
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return app
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class InjectContext(wsgi.Middleware):
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"""Add a 'gceapi.context' to WSGI environ."""
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def __init__(self, context, *args, **kwargs):
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self.context = context
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super(InjectContext, self).__init__(*args, **kwargs)
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@webob.dec.wsgify(RequestClass=wsgi.Request)
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def __call__(self, req):
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req.environ['gceapi.context'] = self.context
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return self.application
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class GceapiKeystoneContext(wsgi.Middleware):
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"""Make a request context from keystone headers."""
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@webob.dec.wsgify(RequestClass=wsgi.Request)
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def __call__(self, req):
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user_id = req.headers.get('X_USER')
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user_id = req.headers.get('X_USER_ID', user_id)
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if user_id is None:
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LOG.debug("Neither X_USER_ID nor X_USER found in request")
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return webob.exc.HTTPUnauthorized()
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roles = self._get_roles(req)
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if 'X_TENANT_ID' in req.headers:
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# This is the new header since Keystone went to ID/Name
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project_id = req.headers['X_TENANT_ID']
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else:
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# This is for legacy compatibility
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project_id = req.headers['X_TENANT']
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project_name = req.headers.get('X_TENANT_NAME')
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user_name = req.headers.get('X_USER_NAME')
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# Get the auth token
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auth_token = req.headers.get('X_AUTH_TOKEN',
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req.headers.get('X_STORAGE_TOKEN'))
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# Build a context, including the auth_token...
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remote_address = req.remote_addr
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if CONF.use_forwarded_for:
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remote_address = req.headers.get('X-Forwarded-For', remote_address)
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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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ctx = context.RequestContext(user_id,
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project_id,
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user_name=user_name,
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project_name=project_name,
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roles=roles,
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auth_token=auth_token,
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remote_address=remote_address,
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service_catalog=service_catalog)
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req.environ['gceapi.context'] = ctx
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return self.application
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def _get_roles(self, req):
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"""Get the list of roles."""
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if 'X_ROLES' in req.headers:
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roles = req.headers.get('X_ROLES', '')
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else:
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# Fallback to deprecated role header:
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roles = req.headers.get('X_ROLE', '')
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if roles:
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LOG.warning(_("Sourcing roles from deprecated X-Role HTTP "
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"header"))
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return [r.strip() for r in roles.split(',')]
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