135 lines
4.9 KiB
Python
135 lines
4.9 KiB
Python
# Copyright 2016 - Brocade Communications Systems, Inc.
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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 os
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import jwt
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from oslo_config import cfg
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from oslo_log import log as logging
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import pprint
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import requests
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from six.moves import urllib
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from mistral._i18n import _
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from mistral import auth
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from mistral import exceptions as exc
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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class KeycloakAuthHandler(auth.AuthHandler):
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def authenticate(self, req):
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certfile = CONF.keycloak_oidc.certfile
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keyfile = CONF.keycloak_oidc.keyfile
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cafile = CONF.keycloak_oidc.cafile or self.get_system_ca_file()
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insecure = CONF.keycloak_oidc.insecure
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if 'X-Auth-Token' not in req.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 exc.UnauthorizedException(message=msg)
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access_token = req.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 as e:
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msg = _("Token can't be decoded because of wrong format %s")\
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% str(e)
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LOG.error(msg)
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raise exc.UnauthorizedException(message=msg)
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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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# NOTE(rakhmerov): There's a special endpoint for introspecting
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# access tokens described in OpenID Connect specification but it's
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# available in KeyCloak starting only with version 1.8.Final so we have
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# to use user info endpoint which also takes exactly one parameter
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# (access token) and replies with error if token is invalid.
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user_info_endpoint_url = CONF.keycloak_oidc.user_info_endpoint_url
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if user_info_endpoint_url.startswith(('http://', 'https://')):
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user_info_endpoint = user_info_endpoint_url
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else:
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user_info_endpoint = (
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("%s" + user_info_endpoint_url) %
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(CONF.keycloak_oidc.auth_url, realm_name))
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verify = None
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if urllib.parse.urlparse(user_info_endpoint).scheme == "https":
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verify = False if insecure else cafile
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cert = (certfile, keyfile) if certfile and keyfile else None
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try:
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resp = requests.get(
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user_info_endpoint,
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headers={"Authorization": "Bearer %s" % access_token},
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verify=verify,
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cert=cert
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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 exc.MistralException(message=msg)
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if resp.status_code == 401:
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LOG.warning("HTTP response from OIDC provider:"
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" [%s] with WWW-Authenticate: [%s]",
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pprint.pformat(resp.text),
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resp.headers.get("WWW-Authenticate"))
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else:
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LOG.debug("HTTP response from OIDC provider: %s",
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pprint.pformat(resp.text))
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resp.raise_for_status()
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LOG.debug(
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"HTTP response from OIDC provider: %s",
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pprint.pformat(resp.json())
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)
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req.headers["X-Identity-Status"] = "Confirmed"
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req.headers["X-Project-Id"] = realm_name
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req.headers["X-Roles"] = roles
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@staticmethod
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def get_system_ca_file():
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"""Return path to system default CA file."""
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# Standard CA file locations for Debian/Ubuntu, RedHat/Fedora,
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# Suse, FreeBSD/OpenBSD, MacOSX, and the bundled ca
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ca_path = ['/etc/ssl/certs/ca-certificates.crt',
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'/etc/pki/tls/certs/ca-bundle.crt',
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'/etc/ssl/ca-bundle.pem',
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'/etc/ssl/cert.pem',
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'/System/Library/OpenSSL/certs/cacert.pem',
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requests.certs.where()]
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for ca in ca_path:
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LOG.debug("Looking for ca file %s", ca)
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if os.path.exists(ca):
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LOG.debug("Using ca file %s", ca)
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return ca
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LOG.warning("System ca file could not be found.")
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