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# 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.
""" Module defining the Django auth backend class for the Keystone API. """
import logging
from django.conf import settings
from django.utils.translation import ugettext_lazy as _
from keystoneclient import exceptions as keystone_exceptions
from openstack_auth import exceptions
from openstack_auth import user as auth_user
from openstack_auth import utils
LOG = logging.getLogger(__name__)
KEYSTONE_CLIENT_ATTR = "_keystoneclient"
class KeystoneBackend(object):
"""Django authentication backend for use with ``django.contrib.auth``."""
def check_auth_expiry(self, auth_ref, margin=None):
if not utils.is_token_valid(auth_ref, margin):
msg = _("The authentication token issued by the Identity service "
"has expired.")
LOG.warning("The authentication token issued by the Identity "
"service appears to have expired before it was "
"issued. This may indicate a problem with either your "
"server or client configuration.")
raise exceptions.KeystoneAuthException(msg)
return True
def get_user(self, user_id):
"""Returns the current user from the session data.
If authenticated, this return the user object based on the user ID
and session data.
Note: this required monkey-patching the ``contrib.auth`` middleware
to make the ``request`` object available to the auth backend class.
"""
if (hasattr(self, 'request') and
user_id == self.request.session["user_id"]):
token = self.request.session['token']
endpoint = self.request.session['region_endpoint']
services_region = self.request.session['services_region']
user = auth_user.create_user_from_token(self.request, token,
endpoint, services_region)
return user
else:
return None
def authenticate(self, request=None, username=None, password=None,
user_domain_name=None, auth_url=None):
"""Authenticates a user via the Keystone Identity API."""
LOG.debug('Beginning user authentication for user "%s".' % username)
interface = getattr(settings, 'OPENSTACK_ENDPOINT_TYPE', 'public')
if auth_url is None:
auth_url = settings.OPENSTACK_KEYSTONE_URL
session = utils.get_session()
keystone_client_class = utils.get_keystone_client().Client
auth_url = utils.fix_auth_url_version(auth_url)
unscoped_auth = utils.get_password_auth_plugin(auth_url,
username,
password,
user_domain_name)
try:
unscoped_auth_ref = unscoped_auth.get_access(session)
except (keystone_exceptions.Unauthorized,
keystone_exceptions.Forbidden,
keystone_exceptions.NotFound) as exc:
msg = _('Invalid user name or password.')
LOG.debug(str(exc))
raise exceptions.KeystoneAuthException(msg)
except (keystone_exceptions.ClientException,
keystone_exceptions.AuthorizationFailure) as exc:
msg = _("An error occurred authenticating. "
"Please try again later.")
LOG.debug(str(exc))
raise exceptions.KeystoneAuthException(msg)
# Check expiry for our unscoped auth ref.
self.check_auth_expiry(unscoped_auth_ref)
unscoped_client = keystone_client_class(session=session,
auth=unscoped_auth)
# We list all the user's projects
try:
if utils.get_keystone_version() >= 3:
projects = unscoped_client.projects.list(
user=unscoped_auth_ref.user_id)
else:
projects = unscoped_client.tenants.list()
except (keystone_exceptions.ClientException,
keystone_exceptions.AuthorizationFailure) as exc:
msg = _('Unable to retrieve authorized projects.')
raise exceptions.KeystoneAuthException(msg)
# Attempt to scope only to enabled projects
projects = [project for project in projects if project.enabled]
# Abort if there are no projects for this user
if not projects:
msg = _('You are not authorized for any projects.')
raise exceptions.KeystoneAuthException(msg)
# the recent project id a user might have set in a cookie
recent_project = None
if request:
# Check if token is automatically scoped to default_project
# grab the project from this token, to use as a default
# if no recent_project is found in the cookie
recent_project = request.COOKIES.get('recent_project',
unscoped_auth_ref.project_id)
# if a most recent project was found, try using it first
if recent_project:
for pos, project in enumerate(projects):
if project.id == recent_project:
# move recent project to the beginning
projects.pop(pos)
projects.insert(0, project)
break
for project in projects:
token = unscoped_auth_ref.auth_token
scoped_auth = utils.get_token_auth_plugin(auth_url,
token=token,
project_id=project.id)
try:
scoped_auth_ref = scoped_auth.get_access(session)
except (keystone_exceptions.ClientException,
keystone_exceptions.AuthorizationFailure):
pass
else:
break
else:
msg = _("Unable to authenticate to any available projects.")
raise exceptions.KeystoneAuthException(msg)
# Check expiry for our new scoped token.
self.check_auth_expiry(scoped_auth_ref)
# If we made it here we succeeded. Create our User!
user = auth_user.create_user_from_token(
request,
auth_user.Token(scoped_auth_ref),
scoped_auth_ref.service_catalog.url_for(endpoint_type=interface))
if request is not None:
request.session['unscoped_token'] = unscoped_auth_ref.auth_token
request.user = user
scoped_client = keystone_client_class(session=session,
auth=scoped_auth)
# Support client caching to save on auth calls.
setattr(request, KEYSTONE_CLIENT_ATTR, scoped_client)
LOG.debug('Authentication completed for user "%s".' % username)
return user
def get_group_permissions(self, user, obj=None):
"""Returns an empty set since Keystone doesn't support "groups"."""
# Keystone V3 added "groups". The Auth token response includes the
# roles from the user's Group assignment. It should be fine just
# returning an empty set here.
return set()
def get_all_permissions(self, user, obj=None):
"""Returns a set of permission strings that the user has.
This permission available to the user is derived from the user's
Keystone "roles".
The permissions are returned as ``"openstack.{{ role.name }}"``.
"""
if user.is_anonymous() or obj is not None:
return set()
# TODO(gabrielhurley): Integrate policy-driven RBAC
# when supported by Keystone.
role_perms = set(["openstack.roles.%s" % role['name'].lower()
for role in user.roles])
service_perms = set(["openstack.services.%s" % service['type'].lower()
for service in user.service_catalog
if user.services_region in
[endpoint.get('region', None) for endpoint
in service.get('endpoints', [])]])
return role_perms | service_perms
def has_perm(self, user, perm, obj=None):
"""Returns True if the given user has the specified permission."""
if not user.is_active:
return False
return perm in self.get_all_permissions(user, obj)
def has_module_perms(self, user, app_label):
"""Returns True if user has any permissions in the given app_label.
Currently this matches for the app_label ``"openstack"``.
"""
if not user.is_active:
return False
for perm in self.get_all_permissions(user):
if perm[:perm.index('.')] == app_label:
return True
return False
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