OpenStack Identity (Keystone)
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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.
import functools
import uuid
import flask
from oslo_log import log
from pycadf import cadftaxonomy as taxonomy
from urllib import parse
from keystone.auth import plugins as auth_plugins
from keystone.auth.plugins import base
from keystone.common import provider_api
from keystone import exception
from keystone.federation import constants as federation_constants
from keystone.federation import utils
from keystone.i18n import _
from keystone import notifications
LOG = log.getLogger(__name__)
METHOD_NAME = 'mapped'
PROVIDERS = provider_api.ProviderAPIs
class Mapped(base.AuthMethodHandler):
def _get_token_ref(self, auth_payload):
token_id = auth_payload['id']
return PROVIDERS.token_provider_api.validate_token(token_id)
def authenticate(self, auth_payload):
"""Authenticate mapped user and set an authentication context.
:param auth_payload: the content of the authentication for a
given method
In addition to ``user_id`` in ``response_data``, this plugin sets
``group_ids``, ``OS-FEDERATION:identity_provider`` and
``OS-FEDERATION:protocol``
"""
if 'id' in auth_payload:
token_ref = self._get_token_ref(auth_payload)
response_data = handle_scoped_token(token_ref,
PROVIDERS.federation_api,
PROVIDERS.identity_api)
else:
response_data = handle_unscoped_token(auth_payload,
PROVIDERS.resource_api,
PROVIDERS.federation_api,
PROVIDERS.identity_api,
PROVIDERS.assignment_api,
PROVIDERS.role_api)
return base.AuthHandlerResponse(status=True, response_body=None,
response_data=response_data)
def handle_scoped_token(token, federation_api, identity_api):
response_data = {}
utils.validate_expiration(token)
token_audit_id = token.audit_id
identity_provider = token.identity_provider_id
protocol = token.protocol_id
user_id = token.user_id
group_ids = []
for group_dict in token.federated_groups:
group_ids.append(group_dict['id'])
send_notification = functools.partial(
notifications.send_saml_audit_notification, 'authenticate',
user_id, group_ids, identity_provider, protocol,
token_audit_id)
utils.assert_enabled_identity_provider(federation_api, identity_provider)
try:
mapping = federation_api.get_mapping_from_idp_and_protocol(
identity_provider, protocol)
utils.validate_mapped_group_ids(group_ids, mapping['id'], identity_api)
except Exception:
# NOTE(topol): Diaper defense to catch any exception, so we can
# send off failed authentication notification, raise the exception
# after sending the notification
send_notification(taxonomy.OUTCOME_FAILURE)
raise
else:
send_notification(taxonomy.OUTCOME_SUCCESS)
response_data['user_id'] = user_id
response_data['group_ids'] = group_ids
response_data[federation_constants.IDENTITY_PROVIDER] = identity_provider
response_data[federation_constants.PROTOCOL] = protocol
return response_data
def handle_unscoped_token(auth_payload, resource_api, federation_api,
identity_api, assignment_api, role_api):
def validate_shadow_mapping(shadow_projects, existing_roles, idp_domain_id,
idp_id):
# Validate that the roles in the shadow mapping actually exist. If
# they don't we should bail early before creating anything.
for shadow_project in shadow_projects:
for shadow_role in shadow_project['roles']:
# The role in the project mapping must exist in order for it to
# be useful.
if shadow_role['name'] not in existing_roles:
LOG.error(
'Role %s was specified in the mapping but does '
'not exist. All roles specified in a mapping must '
'exist before assignment.',
shadow_role['name']
)
# NOTE(lbragstad): The RoleNotFound exception usually
# expects a role_id as the parameter, but in this case we
# only have a name so we'll pass that instead.
raise exception.RoleNotFound(shadow_role['name'])
role = existing_roles[shadow_role['name']]
if (role['domain_id'] is not None and
role['domain_id'] != idp_domain_id):
LOG.error(
'Role %(role)s is a domain-specific role and '
'cannot be assigned within %(domain)s.',
{'role': shadow_role['name'], 'domain': idp_domain_id}
)
raise exception.DomainSpecificRoleNotWithinIdPDomain(
role_name=shadow_role['name'],
identity_provider=idp_id
)
def create_projects_from_mapping(shadow_projects, idp_domain_id,
existing_roles, user, assignment_api,
resource_api):
for shadow_project in shadow_projects:
try:
# Check and see if the project already exists and if it
# does not, try to create it.
project = resource_api.get_project_by_name(
shadow_project['name'], idp_domain_id
)
except exception.ProjectNotFound:
LOG.info(
'Project %(project_name)s does not exist. It will be '
'automatically provisioning for user %(user_id)s.',
{'project_name': shadow_project['name'],
'user_id': user['id']}
)
project_ref = {
'id': uuid.uuid4().hex,
'name': shadow_project['name'],
'domain_id': idp_domain_id
}
project = resource_api.create_project(
project_ref['id'],
project_ref
)
shadow_roles = shadow_project['roles']
for shadow_role in shadow_roles:
assignment_api.create_grant(
existing_roles[shadow_role['name']]['id'],
user_id=user['id'],
project_id=project['id']
)
def is_ephemeral_user(mapped_properties):
return mapped_properties['user']['type'] == utils.UserType.EPHEMERAL
def build_ephemeral_user_context(user, mapped_properties,
identity_provider, protocol):
resp = {}
resp['user_id'] = user['id']
resp['group_ids'] = mapped_properties['group_ids']
resp[federation_constants.IDENTITY_PROVIDER] = identity_provider
resp[federation_constants.PROTOCOL] = protocol
return resp
def build_local_user_context(mapped_properties):
resp = {}
user_info = auth_plugins.UserAuthInfo.create(mapped_properties,
METHOD_NAME)
resp['user_id'] = user_info.user_id
return resp
assertion = extract_assertion_data()
try:
identity_provider = auth_payload['identity_provider']
except KeyError:
raise exception.ValidationError(
attribute='identity_provider', target='mapped')
try:
protocol = auth_payload['protocol']
except KeyError:
raise exception.ValidationError(
attribute='protocol', target='mapped')
utils.assert_enabled_identity_provider(federation_api, identity_provider)
group_ids = None
# NOTE(topol): The user is coming in from an IdP with a SAML assertion
# instead of from a token, so we set token_id to None
token_id = None
# NOTE(marek-denis): This variable is set to None and there is a
# possibility that it will be used in the CADF notification. This means
# operation will not be mapped to any user (even ephemeral).
user_id = None
try:
try:
mapped_properties, mapping_id = apply_mapping_filter(
identity_provider, protocol, assertion, resource_api,
federation_api, identity_api)
except exception.ValidationError as e:
# if mapping is either invalid or yield no valid identity,
# it is considered a failed authentication
raise exception.Unauthorized(e)
if is_ephemeral_user(mapped_properties):
unique_id, display_name = (
get_user_unique_id_and_display_name(mapped_properties)
)
email = mapped_properties['user'].get('email')
user = identity_api.shadow_federated_user(
identity_provider,
protocol, unique_id,
display_name,
email,
group_ids=mapped_properties['group_ids'])
if 'projects' in mapped_properties:
idp_domain_id = federation_api.get_idp(
identity_provider
)['domain_id']
existing_roles = {
role['name']: role for role in role_api.list_roles()
}
# NOTE(lbragstad): If we are dealing with a shadow mapping,
# then we need to make sure we validate all pieces of the
# mapping and what it's saying to create. If there is something
# wrong with how the mapping is, we should bail early before we
# create anything.
validate_shadow_mapping(
mapped_properties['projects'],
existing_roles,
idp_domain_id,
identity_provider
)
create_projects_from_mapping(
mapped_properties['projects'],
idp_domain_id,
existing_roles,
user,
assignment_api,
resource_api
)
user_id = user['id']
group_ids = mapped_properties['group_ids']
response_data = build_ephemeral_user_context(
user, mapped_properties, identity_provider, protocol)
else:
response_data = build_local_user_context(mapped_properties)
except Exception:
# NOTE(topol): Diaper defense to catch any exception, so we can
# send off failed authentication notification, raise the exception
# after sending the notification
outcome = taxonomy.OUTCOME_FAILURE
notifications.send_saml_audit_notification('authenticate',
user_id, group_ids,
identity_provider,
protocol, token_id,
outcome)
raise
else:
outcome = taxonomy.OUTCOME_SUCCESS
notifications.send_saml_audit_notification('authenticate',
user_id, group_ids,
identity_provider,
protocol, token_id,
outcome)
return response_data
def extract_assertion_data():
assertion = dict(utils.get_assertion_params_from_env())
return assertion
def apply_mapping_filter(identity_provider, protocol, assertion,
resource_api, federation_api, identity_api):
idp = federation_api.get_idp(identity_provider)
utils.validate_idp(idp, protocol, assertion)
mapped_properties, mapping_id = federation_api.evaluate(
identity_provider, protocol, assertion)
# NOTE(marek-denis): We update group_ids only here to avoid fetching
# groups identified by name/domain twice.
# NOTE(marek-denis): Groups are translated from name/domain to their
# corresponding ids in the auth plugin, as we need information what
# ``mapping_id`` was used as well as idenity_api and resource_api
# objects.
group_ids = mapped_properties['group_ids']
utils.validate_mapped_group_ids(group_ids, mapping_id, identity_api)
group_ids.extend(
utils.transform_to_group_ids(
mapped_properties['group_names'], mapping_id,
identity_api, resource_api))
mapped_properties['group_ids'] = list(set(group_ids))
return mapped_properties, mapping_id
def get_user_unique_id_and_display_name(mapped_properties):
"""Setup federated username.
Function covers all the cases for properly setting user id, a primary
identifier for identity objects. Initial version of the mapping engine
assumed user is identified by ``name`` and his ``id`` is built from the
name. We, however need to be able to accept local rules that identify user
by either id or name/domain.
The following use-cases are covered:
1) If neither user_name nor user_id is set raise exception.Unauthorized
2) If user_id is set and user_name not, set user_name equal to user_id
3) If user_id is not set and user_name is, set user_id as url safe version
of user_name.
:param mapped_properties: Properties issued by a RuleProcessor.
:type: dictionary
:raises keystone.exception.Unauthorized: If neither `user_name` nor
`user_id` is set.
:returns: tuple with user identification
:rtype: tuple
"""
user = mapped_properties['user']
user_id = user.get('id')
user_name = user.get('name') or flask.request.remote_user
if not any([user_id, user_name]):
msg = _("Could not map user while setting ephemeral user identity. "
"Either mapping rules must specify user id/name or "
"REMOTE_USER environment variable must be set.")
raise exception.Unauthorized(msg)
elif not user_name:
user['name'] = user_id
elif not user_id:
user_id = user_name
if user_name:
user['name'] = user_name
user['id'] = parse.quote(user_id)
return (user['id'], user['name'])