280 lines
12 KiB
Python
280 lines
12 KiB
Python
# 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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""" Module defining the Django auth backend class for the Keystone API. """
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import datetime
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import logging
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import pytz
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from django.conf import settings
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from django.utils.module_loading import import_string
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from django.utils.translation import gettext_lazy as _
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from openstack_auth import exceptions
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from openstack_auth import user as auth_user
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from openstack_auth import utils
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LOG = logging.getLogger(__name__)
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KEYSTONE_CLIENT_ATTR = "_keystoneclient"
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# TODO(stephenfin): Subclass 'django.contrib.auth.backends.BaseBackend' once we
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# (only) support Django 3.0
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class KeystoneBackend(object):
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"""Django authentication backend for use with ``django.contrib.auth``."""
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def __init__(self):
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self._auth_plugins = None
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@property
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def auth_plugins(self):
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if self._auth_plugins is None:
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plugins = settings.AUTHENTICATION_PLUGINS
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self._auth_plugins = [import_string(p)() for p in plugins]
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return self._auth_plugins
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def get_user(self, user_id):
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"""Returns the current user from the session data.
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If authenticated, this return the user object based on the user ID
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and session data.
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.. note::
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This required monkey-patching the ``contrib.auth`` middleware
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to make the ``request`` object available to the auth backend class.
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"""
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if (hasattr(self, 'request') and
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user_id == self.request.session["user_id"]):
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token = self.request.session['token']
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endpoint = self.request.session['region_endpoint']
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services_region = self.request.session['services_region']
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user = auth_user.create_user_from_token(self.request, token,
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endpoint, services_region)
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return user
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return None
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def _check_auth_expiry(self, auth_ref, margin=None):
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if not utils.is_token_valid(auth_ref, margin):
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msg = _("The authentication token issued by the Identity service "
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"has expired.")
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LOG.warning("The authentication token issued by the Identity "
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"service appears to have expired before it was "
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"issued. This may indicate a problem with either your "
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"server or client configuration.")
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raise exceptions.KeystoneTokenExpiredException(msg)
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return True
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def _get_auth_backend(self, auth_url, **kwargs):
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for plugin in self.auth_plugins:
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unscoped_auth = plugin.get_plugin(auth_url=auth_url, **kwargs)
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if unscoped_auth:
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return plugin, unscoped_auth
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else:
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msg = _('No authentication backend could be determined to '
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'handle the provided credentials.')
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LOG.warning('No authentication backend could be determined to '
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'handle the provided credentials. This is likely a '
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'configuration error that should be addressed.')
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raise exceptions.KeystoneNoBackendException(msg)
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def authenticate(self, request, auth_url=None, **kwargs):
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"""Authenticates a user via the Keystone Identity API."""
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LOG.debug('Beginning user authentication')
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if not auth_url:
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auth_url = settings.OPENSTACK_KEYSTONE_URL
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auth_url, url_fixed = utils.fix_auth_url_version_prefix(auth_url)
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if url_fixed:
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LOG.warning("The OPENSTACK_KEYSTONE_URL setting points to a v2.0 "
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"Keystone endpoint, but v3 is specified as the API "
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"version to use by Horizon. Using v3 endpoint for "
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"authentication.")
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plugin, unscoped_auth = self._get_auth_backend(auth_url, **kwargs)
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client_ip = utils.get_client_ip(request)
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session = utils.get_session(original_ip=client_ip)
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# the recent project id a user might have set in a cookie
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recent_project = None
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if request:
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# Grab recent_project found in the cookie, try to scope
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# to the last project used.
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recent_project = request.COOKIES.get('recent_project')
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unscoped_auth_ref = plugin.get_access_info(unscoped_auth,
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session=session)
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# Check expiry for our unscoped auth ref.
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self._check_auth_expiry(unscoped_auth_ref)
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domain_name = kwargs.get('user_domain_name', None)
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domain_auth, domain_auth_ref = plugin.get_domain_scoped_auth(
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unscoped_auth, unscoped_auth_ref, domain_name, session=session)
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scoped_auth, scoped_auth_ref = plugin.get_project_scoped_auth(
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unscoped_auth, unscoped_auth_ref, recent_project=recent_project,
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session=session)
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# Abort if there are no projects for this user and a valid domain
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# token has not been obtained
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#
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# The valid use cases for a user login are:
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# Keystone v2: user must have a role on a project and be able
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# to obtain a project scoped token
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# Keystone v3: 1) user can obtain a domain scoped token (user
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# has a role on the domain they authenticated to),
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# only, no roles on a project
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# 2) user can obtain a domain scoped token and has
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# a role on a project in the domain they
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# authenticated to (and can obtain a project scoped
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# token)
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# 3) user cannot obtain a domain scoped token, but can
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# obtain a project scoped token
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if not scoped_auth_ref and domain_auth_ref:
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# if the user can't obtain a project scoped token, set the scoped
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# token to be the domain token, if valid
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scoped_auth = domain_auth
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scoped_auth_ref = domain_auth_ref
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elif not scoped_auth_ref and not domain_auth_ref:
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msg = _('You are not authorized for any projects or domains.')
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raise exceptions.KeystoneNoProjectsException(msg)
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# Check expiry for our new scoped token.
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self._check_auth_expiry(scoped_auth_ref)
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# We want to try to use the same region we just logged into
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# which may or may not be the default depending upon the order
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# keystone uses
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region_name = None
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id_endpoints = scoped_auth_ref.service_catalog.\
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get_endpoints(service_type='identity')
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for id_endpoint in id_endpoints['identity']:
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if auth_url in id_endpoint.values():
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region_name = id_endpoint['region']
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break
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if settings.OPENSTACK_KEYSTONE_ENDPOINT_TYPE:
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interface = settings.OPENSTACK_KEYSTONE_ENDPOINT_TYPE
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else:
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interface = settings.OPENSTACK_ENDPOINT_TYPE
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endpoint = scoped_auth_ref.service_catalog.url_for(
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service_type='identity',
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interface=interface,
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region_name=region_name)
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# If we made it here we succeeded. Create our User!
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unscoped_token = unscoped_auth_ref.auth_token
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user = auth_user.create_user_from_token(
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request,
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auth_user.Token(scoped_auth_ref, unscoped_token=unscoped_token),
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endpoint,
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services_region=region_name)
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if request is not None:
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# if no k2k providers exist then the function returns quickly
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utils.store_initial_k2k_session(auth_url, request, scoped_auth_ref,
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unscoped_auth_ref)
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request.session['unscoped_token'] = unscoped_token
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if domain_auth_ref:
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# check django session engine, if using cookies, this will not
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# work, as it will overflow the cookie so don't add domain
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# scoped token to the session and put error in the log
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if utils.using_cookie_backed_sessions():
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LOG.error('Using signed cookies as SESSION_ENGINE with '
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'OPENSTACK_KEYSTONE_MULTIDOMAIN_SUPPORT is '
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'enabled. This disables the ability to '
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'perform identity operations due to cookie size '
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'constraints.')
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else:
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request.session['domain_token'] = domain_auth_ref
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request.user = user
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timeout = settings.SESSION_TIMEOUT
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token_life = user.token.expires - datetime.datetime.now(pytz.utc)
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session_time = min(timeout, int(token_life.total_seconds()))
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request.session.set_expiry(session_time)
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keystone_client_class = utils.get_keystone_client().Client
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scoped_client = keystone_client_class(session=session,
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auth=scoped_auth)
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# Support client caching to save on auth calls.
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setattr(request, KEYSTONE_CLIENT_ATTR, scoped_client)
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LOG.debug('Authentication completed.')
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return user
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def get_group_permissions(self, user, obj=None):
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"""Returns an empty set since Keystone doesn't support "groups"."""
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# Keystone V3 added "groups". The Auth token response includes the
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# roles from the user's Group assignment. It should be fine just
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# returning an empty set here.
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return set()
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def get_all_permissions(self, user, obj=None):
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"""Returns a set of permission strings that the user has.
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This permission available to the user is derived from the user's
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Keystone "roles".
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The permissions are returned as ``"openstack.{{ role.name }}"``.
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"""
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if user.is_anonymous or obj is not None:
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return set()
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# TODO(gabrielhurley): Integrate policy-driven RBAC
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# when supported by Keystone.
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role_perms = {utils.get_role_permission(role['name'])
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for role in user.roles}
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services = []
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for service in user.service_catalog:
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try:
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service_type = service['type']
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except KeyError:
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continue
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service_regions = [utils.get_endpoint_region(endpoint) for endpoint
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in service.get('endpoints', [])]
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if user.services_region in service_regions:
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services.append(service_type.lower())
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service_perms = {"openstack.services.%s" % service
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for service in services}
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return role_perms | service_perms
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def has_perm(self, user, perm, obj=None):
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"""Returns True if the given user has the specified permission."""
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if not user.is_active:
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return False
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return perm in self.get_all_permissions(user, obj)
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def has_module_perms(self, user, app_label):
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"""Returns True if user has any permissions in the given app_label.
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Currently this matches for the app_label ``"openstack"``.
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"""
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if not user.is_active:
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return False
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for perm in self.get_all_permissions(user):
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if perm[:perm.index('.')] == app_label:
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return True
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return False
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