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OpenStack Study: token.py

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# Copyright 2013 OpenStack Foundation

#

# 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.

from keystone import auth

from keystone.common import wsgi

from keystone import exception

from keystone.openstack.common import log

from keystone.openstack.common import timeutils

from keystone.token import provider

LOG = log.getLogger(__name__)

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class Token(auth.AuthMethodHandler):

method = 'token'

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    def __init__(self):

        self.provider = provider.Manager()

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    def authenticate(self, context, auth_payload, user_context):

        try:

            if 'id' not in auth_payload:

                raise exception.ValidationError(attribute='id',

                                                target=self.method)

            token_id = auth_payload['id']

            response = self.provider.validate_token(token_id)

            #for V3 tokens, the essential data is under  the 'token' value.

            #For V2, the comparable data was nested under 'access'

            token_ref = response.get('token', response.get('access'))

            #Do not allow tokens used for delegation to

            #create another token, or perform any changes of

            #state in Keystone. TO do so is to invite elevation of

            #privilege attacks

            if 'OS-TRUST:trust' in token_ref:

                raise exception.Forbidden()

            if 'trust' in token_ref:

                raise exception.Forbidden()

            if 'trust_id' in token_ref.get('metadata', {}):

                raise exception.Forbidden()

            if 'OS-OAUTH1' in token_ref:

                raise exception.Forbidden()

            wsgi.validate_token_bind(context, token_ref)

            #new tokens are not allowed to extend the expiration

            #time of an old token, otherwise, they could be extened

            #forever.   The expiration value was stored at different

            #locations in v2 and v3 tokens.

            expires_at = token_ref.get('expires_at')

            if not expires_at:

                expires_at = token_ref.get('expires')

            if not expires_at:

                expires_at = timeutils.normalize_time(

                    timeutils.parse_isotime(token_ref['token']['expires']))

            user_context.setdefault('expires_at', expires_at)

            user_context.setdefault('user_id', token_ref['user']['id'])

            user_context['extras'].update(token_ref.get('extras', {}))

            user_context['method_names'].extend(token_ref.get('methods', []))

        except AssertionError as e:

            LOG.error(e)

            raise exception.Unauthorized(e)