261 lines
10 KiB
Python
261 lines
10 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.translation import ugettext_lazy as _
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from keystoneclient import exceptions as keystone_exceptions
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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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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 = getattr(
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settings,
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'AUTHENTICATION_PLUGINS',
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['openstack_auth.plugin.password.PasswordPlugin',
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'openstack_auth.plugin.token.TokenPlugin'])
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self._auth_plugins = [utils.import_string(p)() for p in plugins]
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return self._auth_plugins
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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.KeystoneAuthException(msg)
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return True
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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: 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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else:
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return None
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def authenticate(self, 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 = utils.fix_auth_url_version(auth_url)
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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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break
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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.warn('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.KeystoneAuthException(msg)
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session = utils.get_session()
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keystone_client_class = utils.get_keystone_client().Client
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try:
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unscoped_auth_ref = unscoped_auth.get_access(session)
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except keystone_exceptions.ConnectionRefused as exc:
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LOG.error(str(exc))
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msg = _('Unable to establish connection to keystone endpoint.')
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raise exceptions.KeystoneAuthException(msg)
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except (keystone_exceptions.Unauthorized,
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keystone_exceptions.Forbidden,
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keystone_exceptions.NotFound) as exc:
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LOG.debug(str(exc))
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raise exceptions.KeystoneAuthException(_('Invalid credentials.'))
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except (keystone_exceptions.ClientException,
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keystone_exceptions.AuthorizationFailure) as exc:
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msg = _("An error occurred authenticating. "
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"Please try again later.")
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LOG.debug(str(exc))
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raise exceptions.KeystoneAuthException(msg)
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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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projects = plugin.list_projects(session,
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unscoped_auth,
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unscoped_auth_ref)
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# Attempt to scope only to enabled projects
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projects = [project for project in projects if project.enabled]
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# Abort if there are no projects for this user
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if not projects:
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msg = _('You are not authorized for any projects.')
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raise exceptions.KeystoneAuthException(msg)
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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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request = kwargs.get('request')
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if request:
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# Check if token is automatically scoped to default_project
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# grab the project from this token, to use as a default
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# if no recent_project is found in the cookie
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recent_project = request.COOKIES.get('recent_project',
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unscoped_auth_ref.project_id)
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# if a most recent project was found, try using it first
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if recent_project:
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for pos, project in enumerate(projects):
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if project.id == recent_project:
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# move recent project to the beginning
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projects.pop(pos)
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projects.insert(0, project)
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break
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for project in projects:
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token = unscoped_auth_ref.auth_token
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scoped_auth = utils.get_token_auth_plugin(auth_url,
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token=token,
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project_id=project.id)
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try:
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scoped_auth_ref = scoped_auth.get_access(session)
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except (keystone_exceptions.ClientException,
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keystone_exceptions.AuthorizationFailure):
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pass
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else:
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break
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else:
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msg = _("Unable to authenticate to any available projects.")
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raise exceptions.KeystoneAuthException(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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interface = getattr(settings, 'OPENSTACK_ENDPOINT_TYPE', 'public')
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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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scoped_auth_ref.service_catalog.url_for(endpoint_type=interface))
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if request is not None:
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request.session['unscoped_token'] = unscoped_token
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request.user = user
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timeout = getattr(settings, "SESSION_TIMEOUT", 3600)
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token_life = user.token.expires - datetime.datetime.now(pytz.utc)
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session_time = min(timeout, token_life.seconds)
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request.session.set_expiry(session_time)
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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 = set(["openstack.roles.%s" % role['name'].lower()
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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 = set(["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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