135 lines
4.8 KiB
Python
135 lines
4.8 KiB
Python
# Copyright 2017 - Nokia Networks
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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 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 jwt
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import memcache
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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_middleware import base as base_middleware
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import pprint
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import requests
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import webob.dec
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from glare.common import exception
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from glare.i18n import _
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LOG = logging.getLogger(__name__)
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keycloak_oidc_opts = [
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cfg.StrOpt(
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'auth_url',
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default='http://127.0.0.1:8080/auth',
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help='Keycloak base url (e.g. https://my.keycloak:8443/auth)'
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),
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cfg.StrOpt(
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'user_info_endpoint_url',
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default='/realms/%s/protocol/openid-connect/userinfo',
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help='Endpoint against which authorization will be performed'
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),
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cfg.StrOpt(
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'insecure',
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default=False,
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help='If True, SSL/TLS certificate verification is disabled'
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),
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cfg.StrOpt(
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'memcached_server',
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default=None,
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help='Url of memcached server to use for caching'
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),
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cfg.IntOpt(
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'token_cache_time',
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default=60,
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min=0,
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help='In order to prevent excessive effort spent validating '
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'tokens, the middleware caches previously-seen tokens '
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'for a configurable duration (in seconds).'
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),
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]
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CONF = cfg.CONF
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CONF.register_opts(keycloak_oidc_opts, group="keycloak_oidc")
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class KeycloakAuthMiddleware(base_middleware.Middleware):
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def __init__(self, app):
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super(KeycloakAuthMiddleware, self).__init__(application=app)
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mcserv_url = CONF.keycloak_oidc.memcached_server
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self.mcclient = memcache.Client(mcserv_url) if mcserv_url else None
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def authenticate(self, access_token, realm_name):
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info = None
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if self.mcclient:
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info = self.mcclient.get(access_token)
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if info is None and CONF.keycloak_oidc.user_info_endpoint_url:
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try:
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resp = requests.get(
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CONF.keycloak_oidc.auth_url +
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(CONF.keycloak_oidc.user_info_endpoint_url % realm_name),
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headers={"Authorization": "Bearer %s" % access_token},
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verify=not CONF.keycloak_oidc.insecure
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)
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except requests.ConnectionError:
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msg = _("Can't connect to keycloak server with address '%s'."
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) % CONF.keycloak_oidc.auth_url
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LOG.error(msg)
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raise exception.GlareException(message=msg)
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if resp.status_code == 401:
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raise exception.Unauthorized(message=resp.text)
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if resp.status_code == 403:
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raise exception.Forbidden(message=resp.text)
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elif resp.status_code >= 400:
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raise exception.GlareException(message=resp.text)
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if self.mcclient:
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self.mcclient.set(access_token, resp.json(),
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time=CONF.keycloak_oidc.token_cache_time)
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info = resp.json()
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LOG.debug("HTTP response from OIDC provider: %s",
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pprint.pformat(info))
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return info
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@webob.dec.wsgify
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def __call__(self, request):
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if 'X-Auth-Token' not in request.headers:
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msg = _("Auth token must be provided in 'X-Auth-Token' header.")
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LOG.error(msg)
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raise exception.Unauthorized()
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access_token = request.headers.get('X-Auth-Token')
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try:
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decoded = jwt.decode(access_token, algorithms=['RS256'],
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verify=False)
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except Exception:
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msg = _("Token can't be decoded because of wrong format.")
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LOG.error(msg)
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raise exception.Unauthorized()
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# Get user realm from parsed token
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# Format is "iss": "http://<host>:<port>/auth/realms/<realm_name>",
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__, __, realm_name = decoded['iss'].strip().rpartition('/realms/')
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# Get roles from from parsed token
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roles = ','.join(decoded['realm_access']['roles']) \
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if 'realm_access' in decoded else ''
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self.authenticate(access_token, realm_name)
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request.headers["X-Identity-Status"] = "Confirmed"
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request.headers["X-Project-Id"] = realm_name
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request.headers["X-Roles"] = roles
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return request.get_response(self.application)
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