136 lines
5.3 KiB
Python
136 lines
5.3 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2013 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from keystoneclient.v2_0 import client as keystone_client
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from keystoneclient import exceptions as keystone_exceptions
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from oslo.config import cfg
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from webob.exc import HTTPBadRequest
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from webob.exc import HTTPUnauthorized
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from heat.openstack.common import importutils
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class KeystonePasswordAuthProtocol(object):
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"""
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Alternative authentication middleware that uses username and password
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to authenticate against Keystone instead of validating existing auth token.
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The benefit being that you no longer require admin/service token to
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authenticate users.
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"""
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def __init__(self, app, conf):
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self.app = app
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self.conf = conf
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auth_url = None
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if not cfg.CONF.auth_password.multi_cloud:
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if 'auth_uri' in self.conf:
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auth_url = self.conf['auth_uri']
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else:
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# Import auth_token to have keystone_authtoken settings setup.
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importutils.import_module(
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'keystoneclient.middleware.auth_token')
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auth_url = cfg.CONF.keystone_authtoken['auth_uri']
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self.auth_url = auth_url
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def __call__(self, env, start_response):
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"""Authenticate incoming request."""
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username = env.get('HTTP_X_AUTH_USER')
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password = env.get('HTTP_X_AUTH_KEY')
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# Determine tenant id from path.
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tenant = env.get('PATH_INFO').split('/')[1]
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auth_url = self.auth_url
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if cfg.CONF.auth_password.multi_cloud:
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auth_url = env.get('HTTP_X_AUTH_URL')
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error = self._validate_auth_url(env, start_response, auth_url)
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if error:
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return error
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if not tenant:
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return self._reject_request(env, start_response, auth_url)
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try:
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client = keystone_client.Client(
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username=username, password=password, tenant_id=tenant,
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auth_url=auth_url)
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except (keystone_exceptions.Unauthorized,
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keystone_exceptions.Forbidden,
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keystone_exceptions.NotFound,
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keystone_exceptions.AuthorizationFailure):
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return self._reject_request(env, start_response, auth_url)
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env['keystone.token_info'] = client.auth_ref
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env.update(self._build_user_headers(client.auth_ref, auth_url))
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return self.app(env, start_response)
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def _reject_request(self, env, start_response, auth_url):
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"""Redirect client to auth server."""
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headers = [('WWW-Authenticate', 'Keystone uri=\'%s\'' % auth_url)]
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resp = HTTPUnauthorized('Authentication required', headers)
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return resp(env, start_response)
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def _build_user_headers(self, token_info, auth_url):
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"""Build headers that represent authenticated user from auth token."""
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tenant_id = token_info['token']['tenant']['id']
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tenant_name = token_info['token']['tenant']['name']
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user_id = token_info['user']['id']
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user_name = token_info['user']['name']
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roles = ','.join(
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[role['name'] for role in token_info['user']['roles']])
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service_catalog = token_info['serviceCatalog']
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auth_token = token_info['token']['id']
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headers = {
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'HTTP_X_IDENTITY_STATUS': 'Confirmed',
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'HTTP_X_PROJECT_ID': tenant_id,
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'HTTP_X_PROJECT_NAME': tenant_name,
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'HTTP_X_USER_ID': user_id,
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'HTTP_X_USER_NAME': user_name,
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'HTTP_X_ROLES': roles,
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'HTTP_X_SERVICE_CATALOG': service_catalog,
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'HTTP_X_AUTH_TOKEN': auth_token,
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'HTTP_X_AUTH_URL': auth_url,
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# DEPRECATED
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'HTTP_X_USER': user_name,
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'HTTP_X_TENANT_ID': tenant_id,
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'HTTP_X_TENANT_NAME': tenant_name,
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'HTTP_X_TENANT': tenant_name,
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'HTTP_X_ROLE': roles,
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}
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return headers
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def _validate_auth_url(self, env, start_response, auth_url):
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"""Validate auth_url to ensure it can be used."""
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if not auth_url:
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resp = HTTPBadRequest(_('Request missing required header '
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'X-Auth-Url'))
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return resp(env, start_response)
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allowed = cfg.CONF.auth_password.allowed_auth_uris
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if auth_url not in allowed:
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resp = HTTPUnauthorized(_('Header X-Auth-Url "%s" not an allowed '
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'endpoint')
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% auth_url)
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return resp(env, start_response)
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return None
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def filter_factory(global_conf, **local_conf):
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"""Returns a WSGI filter app for use with paste.deploy."""
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conf = global_conf.copy()
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conf.update(local_conf)
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def auth_filter(app):
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return KeystonePasswordAuthProtocol(app, conf)
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return auth_filter
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