# octavia.common.keystone

# Source code for octavia.common.keystone

    #    Copyright 2015 Rackspace
    #
    #    Licensed under the Apache License, Version 2.0 (the "License"); you may
    #    not use this file except in compliance with the License. You may obtain
    #    a copy of the License at
    #
    #         http://www.apache.org/licenses/LICENSE-2.0
    #
    #    Unless required by applicable law or agreed to in writing, software
    #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    #    License for the specific language governing permissions and limitations
    #    under the License.

    from keystoneauth1 import exceptions as ks_exceptions
    from keystoneauth1 import loading as ks_loading
    from keystonemiddleware import auth_token
    from oslo_config import cfg
    from oslo_log import log as logging

    from octavia.common import constants

    LOG = logging.getLogger(__name__)

    _NOAUTH_PATHS = ['/', '/load-balancer/', '/healthcheck',
                     '/load-balancer/healthcheck']

    class KeystoneSession:

        def __init__(self, section=constants.SERVICE_AUTH):
            self._session = None
            self._auth = None

            self.section = section

        def get_session(self, auth=None):
            """Initializes a Keystone session.

            :return: a Keystone Session object
            """
            if auth:
                # Do not use the singleton with custom auth params
                return ks_loading.load_session_from_conf_options(
                    cfg.CONF, self.section, auth=auth)

            if not self._session:
                self._session = ks_loading.load_session_from_conf_options(
                    cfg.CONF, self.section, auth=self.get_auth())

            return self._session

        def get_auth(self):
            if not self._auth:
                try:
                    self._auth = ks_loading.load_auth_from_conf_options(
                        cfg.CONF, self.section)
                except ks_exceptions.auth_plugins.MissingRequiredOptions as e:
                    if self.section == constants.SERVICE_AUTH:
                        raise e
                    # NOTE(gthiemonge): MissingRequiredOptions is raised: there is
                    # one or more missing auth options in the config file. It may
                    # be due to the migration from python-neutronclient to
                    # openstacksdk.
                    # With neutronclient, most of the auth settings were in
                    # [service_auth] with a few overrides in [neutron],
                    # but with openstacksdk, we have all the auth settings in the
                    # [neutron] section. In order to support smooth upgrades, in
                    # case those options are missing, we override the undefined
                    # options with the existing settings from [service_auth].

                    # This code should be removed when all the deployment tools set
                    # the correct options in [neutron]

                    # The config options are lazily registered/loaded by keystone,
                    # it means that we cannot get/set them before invoking
                    # 'load_auth_from_conf_options' on 'service_auth'.
                    ks_loading.load_auth_from_conf_options(
                        cfg.CONF, constants.SERVICE_AUTH)

                    config = getattr(cfg.CONF, self.section)
                    for opt in config:
                        # For each option in the [section] section, get its setting
                        # location, if the location is 'opt_default', it means that
                        # the option is not configured in the config file.
                        # if the option is also defined in [service_auth], the
                        # option of the [section] can be replaced by the one from
                        # [service_auth]
                        loc = cfg.CONF.get_location(opt, self.section)
                        if not loc or loc.location == cfg.Locations.opt_default:
                            if hasattr(cfg.CONF.service_auth, opt):
                                cur_value = getattr(config, opt)
                                value = getattr(cfg.CONF.service_auth, opt)
                                if value != cur_value:
                                    log_value = (value if opt != "password"
                                                 else "<hidden>")
                                    LOG.debug("Overriding [%s].%s with '%s'",
                                              self.section, opt, log_value)
                                    cfg.CONF.set_override(opt, value, self.section)

                    # Now we can call load_auth_from_conf_options for this specific
                    # service with the newly defined options.
                    self._auth = ks_loading.load_auth_from_conf_options(
                        cfg.CONF, self.section)

            return self._auth

        def get_service_user_id(self):
            return self.get_auth().get_user_id(self.get_session())

    class SkippingAuthProtocol(auth_token.AuthProtocol):
        """SkippingAuthProtocol to reach special endpoints

        Bypasses keystone authentication for special request paths, such
        as the api version discovery path.

        Note:
            SkippingAuthProtocol is lean customization
            of :py:class:`keystonemiddleware.auth_token.AuthProtocol`
            that disables keystone communication if the request path
            is in the _NOAUTH_PATHS list.

        """

        def process_request(self, request):
            path = request.path
            if path in _NOAUTH_PATHS:
                LOG.debug('Request path is %s and it does not require keystone '
                          'authentication', path)
                return None  # return NONE to reach actual logic

            return super().process_request(request)

this page last updated: 2025-10-06 11:22:08

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