145 lines
5.5 KiB
Python
145 lines
5.5 KiB
Python
#
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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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import logging
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from keystoneclient import exceptions as keystone_exceptions
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from keystoneclient import session
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from oslo_config import cfg
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from webob import exc
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from heat.common import context
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LOG = logging.getLogger(__name__)
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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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self.session = session.Session.construct(self._ssl_options())
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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 = env.get('HTTP_X_AUTH_URL')
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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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ctx = context.RequestContext(username=username, password=password,
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tenant_id=tenant, auth_url=auth_url,
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is_admin=False)
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auth_ref = ctx.auth_plugin.get_access(self.session)
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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.update(self._build_user_headers(auth_ref))
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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 = exc.HTTPUnauthorized('Authentication required', headers)
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return resp(env, start_response)
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def _build_user_headers(self, token_info):
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"""Build headers that represent authenticated user from auth token."""
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if token_info.get('version') == 'v3':
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keystone_token_info = {'token': token_info}
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tenant_id = token_info['project']['id']
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tenant_name = token_info['project']['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['roles']])
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service_catalog = None
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auth_token = token_info['auth_token']
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else:
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keystone_token_info = token_info
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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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'keystone.token_info': keystone_token_info,
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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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# 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 _ssl_options(self):
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opts = {'cacert': self._get_client_option('ca_file'),
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'insecure': self._get_client_option('insecure'),
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'cert': self._get_client_option('cert_file'),
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'key': self._get_client_option('key_file')}
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return opts
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def _get_client_option(self, option):
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# look for the option in the [clients_keystone] section
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# unknown options raise cfg.NoSuchOptError
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cfg.CONF.import_opt(option, 'heat.common.config',
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group='clients_keystone')
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v = getattr(cfg.CONF.clients_keystone, option)
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if v is not None:
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return v
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# look for the option in the generic [clients] section
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cfg.CONF.import_opt(option, 'heat.common.config', group='clients')
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return getattr(cfg.CONF.clients, option)
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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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