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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2012 OpenStack LLC
#
# 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.
"""Token provider interface."""
from keystone.common import dependency
from keystone.common import manager
from keystone import config
from keystone import exception
from keystone.openstack.common import log as logging
CONF = config.CONF
LOG = logging.getLogger(__name__)
# supported token versions
V2 = 'v2.0'
V3 = 'v3.0'
# default token providers
PKI_PROVIDER = 'keystone.token.providers.pki.Provider'
UUID_PROVIDER = 'keystone.token.providers.uuid.Provider'
class UnsupportedTokenVersionException(Exception):
"""Token version is unrecognizable or unsupported."""
pass
@dependency.provider('token_provider_api')
class Manager(manager.Manager):
"""Default pivot point for the token provider backend.
See :mod:`keystone.common.manager.Manager` for more details on how this
dynamically calls the backend.
"""
@classmethod
def get_token_provider(cls):
"""Return package path to the configured token provider.
The value should come from ``keystone.conf`` ``[token] provider``,
however this method ensures backwards compatibility for
``keystone.conf`` ``[signing] token_format`` until Havana + 2.
Return the provider based on ``token_format`` if ``provider`` is not
set. Otherwise, ignore ``token_format`` and return the configured
``provider`` instead.
"""
if CONF.token.provider is not None:
# NOTE(gyee): we are deprecating CONF.signing.token_format. This
# code is to ensure the token provider configuration agrees with
# CONF.signing.token_format.
if ((CONF.signing.token_format == 'PKI' and
CONF.token.provider != PKI_PROVIDER or
(CONF.signing.token_format == 'UUID' and
CONF.token.provider != UUID_PROVIDER))):
raise exception.UnexpectedError(
_('keystone.conf [signing] token_format (deprecated) '
'conflicts with keystone.conf [token] provider'))
return CONF.token.provider
else:
if not CONF.signing.token_format:
# No token provider and no format, so use default (PKI)
return PKI_PROVIDER
msg = _('keystone.conf [signing] token_format is deprecated in '
'favor of keystone.conf [token] provider')
if CONF.signing.token_format == 'PKI':
LOG.warning(msg)
return PKI_PROVIDER
elif CONF.signing.token_format == 'UUID':
LOG.warning(msg)
return UUID_PROVIDER
else:
raise exception.UnexpectedError(
_('Unrecognized keystone.conf [signing] token_format: '
'expected either \'UUID\' or \'PKI\''))
def __init__(self):
super(Manager, self).__init__(self.get_token_provider())
class Provider(object):
"""Interface description for a Token provider."""
def get_token_version(self, token_data):
"""Return the version of the given token data.
If the given token data is unrecognizable,
UnsupportedTokenVersionException is raised.
"""
raise exception.NotImplemented()
def issue_token(self, version='v3.0', **kwargs):
"""Issue a V3 token.
For V3 tokens, 'user_id', 'method_names', must present in kwargs.
Optionally, kwargs may contain 'expires_at' for rescope tokens;
'project_id' for project-scoped token; 'domain_id' for
domain-scoped token; and 'auth_context' from the authentication
plugins.
For V2 tokens, 'token_ref' must be present in kwargs.
Optionally, kwargs may contain 'roles_ref' and 'catalog_ref'.
:param context: request context
:type context: dictionary
:param version: version of the token to be issued
:type version: string
:param kwargs: information needed for token creation. Parameters
may be different depending on token version.
:type kwargs: dictionary
:returns: (token_id, token_data)
"""
raise exception.NotImplemented()
def revoke_token(self, token_id):
"""Revoke a given token.
:param token_id: identity of the token
:type token_id: string
:returns: None.
"""
raise exception.NotImplemented()
def validate_token(self, token_id, belongs_to=None, version='v3.0'):
"""Validate the given token and return the token data.
Must raise Unauthorized exception if unable to validate token.
:param token_id: identity of the token
:type token_id: string
:param belongs_to: identity of the scoped project to validate
:type belongs_to: string
:param version: version of the token to be validated
:type version: string
:returns: token data
:raises: keystone.exception.Unauthorized
"""
raise exception.NotImplemented()
def check_token(self, token_id, belongs_to=None, version='v3.0'):
"""Check the validity of the given V3 token.
Must raise Unauthorized exception if unable to check token.
:param token_id: identity of the token
:type token_id: string
:param belongs_to: identity of the scoped project to validate
:type belongs_to: string
:param version: version of the token to check
:type version: string
:returns: None
:raises: keystone.exception.Unauthorized
"""
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