681 lines
26 KiB
Python
681 lines
26 KiB
Python
# Copyright 2013 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import functools
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import uuid
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from keystone.common import authorization
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from keystone.common import dependency
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from keystone.common import driver_hints
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from keystone.common import utils
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from keystone.common import wsgi
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from keystone import config
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from keystone import exception
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from keystone.openstack.common.gettextutils import _
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from keystone.openstack.common import log
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from keystone.openstack.common import versionutils
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LOG = log.getLogger(__name__)
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CONF = config.CONF
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v2_deprecated = versionutils.deprecated(what='v2 API',
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as_of=versionutils.deprecated.ICEHOUSE,
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in_favor_of='v3 API')
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def _build_policy_check_credentials(self, action, context, kwargs):
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LOG.debug(_('RBAC: Authorizing %(action)s(%(kwargs)s)'), {
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'action': action,
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'kwargs': ', '.join(['%s=%s' % (k, kwargs[k]) for k in kwargs])})
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# see if auth context has already been created. If so use it.
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if ('environment' in context and
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authorization.AUTH_CONTEXT_ENV in context['environment']):
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LOG.debug(_('RBAC: using auth context from the request environment'))
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return context['environment'].get(authorization.AUTH_CONTEXT_ENV)
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# now build the auth context from the incoming auth token
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try:
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LOG.debug(_('RBAC: building auth context from the incoming '
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'auth token'))
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# TODO(ayoung): These two functions return the token in different
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# formats. However, the call
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# to get_token hits the caching layer, and does not validate the
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# token. This should be reduced to one call
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if not CONF.token.revoke_by_id:
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self.token_api.token_provider_api.validate_token(
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context['token_id'])
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token_ref = self.token_api.get_token(context['token_id'])
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except exception.TokenNotFound:
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LOG.warning(_('RBAC: Invalid token'))
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raise exception.Unauthorized()
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# NOTE(jamielennox): whilst this maybe shouldn't be within this function
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# it would otherwise need to reload the token_ref from backing store.
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wsgi.validate_token_bind(context, token_ref)
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auth_context = authorization.token_to_auth_context(token_ref['token_data'])
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return auth_context
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def protected(callback=None):
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"""Wraps API calls with role based access controls (RBAC).
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This handles both the protection of the API parameters as well as any
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target entities for single-entity API calls.
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More complex API calls (for example that deal with several different
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entities) should pass in a callback function, that will be subsequently
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called to check protection for these multiple entities. This callback
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function should gather the appropriate entities needed and then call
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check_proetction() in the V3Controller class.
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"""
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def wrapper(f):
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@functools.wraps(f)
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def inner(self, context, *args, **kwargs):
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if 'is_admin' in context and context['is_admin']:
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LOG.warning(_('RBAC: Bypassing authorization'))
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elif callback is not None:
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prep_info = {'f_name': f.__name__,
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'input_attr': kwargs}
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callback(self, context, prep_info, *args, **kwargs)
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else:
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action = 'identity:%s' % f.__name__
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creds = _build_policy_check_credentials(self, action,
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context, kwargs)
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policy_dict = {}
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# Check to see if we need to include the target entity in our
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# policy checks. We deduce this by seeing if the class has
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# specified a get_member() method and that kwargs contains the
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# appropriate entity id.
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if (hasattr(self, 'get_member_from_driver') and
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self.get_member_from_driver is not None):
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key = '%s_id' % self.member_name
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if key in kwargs:
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ref = self.get_member_from_driver(kwargs[key])
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policy_dict['target'] = {self.member_name: ref}
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# TODO(henry-nash): Move this entire code to a member
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# method inside v3 Auth
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if context.get('subject_token_id') is not None:
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token_ref = self.token_api.get_token(
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context['subject_token_id'])
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policy_dict.setdefault('target', {})
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policy_dict['target'].setdefault(self.member_name, {})
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policy_dict['target'][self.member_name]['user_id'] = (
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token_ref['user_id'])
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if 'domain' in token_ref['user']:
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policy_dict['target'][self.member_name].setdefault(
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'user', {})
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policy_dict['target'][self.member_name][
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'user'].setdefault('domain', {})
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policy_dict['target'][self.member_name]['user'][
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'domain']['id'] = (
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token_ref['user']['domain']['id'])
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# Add in the kwargs, which means that any entity provided as a
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# parameter for calls like create and update will be included.
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policy_dict.update(kwargs)
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self.policy_api.enforce(creds,
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action,
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authorization.flatten(policy_dict))
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LOG.debug(_('RBAC: Authorization granted'))
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return f(self, context, *args, **kwargs)
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return inner
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return wrapper
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def filterprotected(*filters):
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"""Wraps filtered API calls with role based access controls (RBAC)."""
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def _filterprotected(f):
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@functools.wraps(f)
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def wrapper(self, context, **kwargs):
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if not context['is_admin']:
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action = 'identity:%s' % f.__name__
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creds = _build_policy_check_credentials(self, action,
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context, kwargs)
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# Now, build the target dict for policy check. We include:
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#
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# - Any query filter parameters
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# - Data from the main url (which will be in the kwargs
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# parameter) and would typically include the prime key
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# of a get/update/delete call
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#
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# First any query filter parameters
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target = dict()
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if filters:
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for item in filters:
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if item in context['query_string']:
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target[item] = context['query_string'][item]
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LOG.debug(_('RBAC: Adding query filter params (%s)'), (
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', '.join(['%s=%s' % (item, target[item])
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for item in target])))
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# Now any formal url parameters
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for key in kwargs:
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target[key] = kwargs[key]
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self.policy_api.enforce(creds,
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action,
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authorization.flatten(target))
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LOG.debug(_('RBAC: Authorization granted'))
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else:
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LOG.warning(_('RBAC: Bypassing authorization'))
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return f(self, context, filters, **kwargs)
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return wrapper
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return _filterprotected
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class V2Controller(wsgi.Application):
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"""Base controller class for Identity API v2."""
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def _normalize_domain_id(self, context, ref):
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"""Fill in domain_id since v2 calls are not domain-aware.
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This will overwrite any domain_id that was inadvertently
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specified in the v2 call.
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"""
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ref['domain_id'] = CONF.identity.default_domain_id
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return ref
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@staticmethod
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def filter_domain_id(ref):
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"""Remove domain_id since v2 calls are not domain-aware."""
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ref.pop('domain_id', None)
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return ref
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@staticmethod
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def normalize_username_in_response(ref):
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"""Adds username to outgoing user refs to match the v2 spec.
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Internally we use `name` to represent a user's name. The v2 spec
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requires the use of `username` instead.
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"""
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if 'username' not in ref and 'name' in ref:
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ref['username'] = ref['name']
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return ref
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@staticmethod
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def normalize_username_in_request(ref):
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"""Adds name in incoming user refs to match the v2 spec.
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Internally we use `name` to represent a user's name. The v2 spec
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requires the use of `username` instead.
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"""
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if 'name' not in ref and 'username' in ref:
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ref['name'] = ref.pop('username')
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return ref
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@staticmethod
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def v3_to_v2_user(ref):
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"""Convert a user_ref from v3 to v2 compatible.
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* v2.0 users are not domain aware, and should have domain_id removed
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* v2.0 users expect the use of tenantId instead of default_project_id
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* v2.0 users have a username attribute
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This method should only be applied to user_refs being returned from the
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v2.0 controller(s).
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If ref is a list type, we will iterate through each element and do the
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conversion.
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"""
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def _format_default_project_id(ref):
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"""Convert default_project_id to tenantId for v2 calls."""
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default_project_id = ref.pop('default_project_id', None)
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if default_project_id is not None:
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ref['tenantId'] = default_project_id
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elif 'tenantId' in ref:
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# NOTE(morganfainberg): To avoid v2.0 confusion if somehow a
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# tenantId property sneaks its way into the extra blob on the
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# user, we remove it here. If default_project_id is set, we
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# would override it in either case.
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del ref['tenantId']
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def _normalize_and_filter_user_properties(ref):
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"""Run through the various filter/normalization methods."""
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_format_default_project_id(ref)
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V2Controller.filter_domain_id(ref)
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V2Controller.normalize_username_in_response(ref)
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return ref
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if isinstance(ref, dict):
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return _normalize_and_filter_user_properties(ref)
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elif isinstance(ref, list):
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return [_normalize_and_filter_user_properties(x) for x in ref]
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else:
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raise ValueError(_('Expected dict or list: %s') % type(ref))
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@dependency.requires('policy_api', 'token_api')
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class V3Controller(wsgi.Application):
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"""Base controller class for Identity API v3.
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Child classes should set the ``collection_name`` and ``member_name`` class
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attributes, representing the collection of entities they are exposing to
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the API. This is required for supporting self-referential links,
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pagination, etc.
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Class parameters:
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* `_mutable_parameters` - set of parameters that can be changed by users.
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Usually used by cls.check_immutable_params()
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* `_public_parameters` - set of parameters that are exposed to the user.
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Usually used by cls.filter_params()
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"""
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collection_name = 'entities'
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member_name = 'entity'
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get_member_from_driver = None
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@classmethod
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def base_url(cls, path=None):
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endpoint = CONF.public_endpoint % CONF
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# allow a missing trailing slash in the config
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if endpoint[-1] != '/':
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endpoint += '/'
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url = endpoint + 'v3'
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if path:
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return url + path
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else:
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return url + '/' + cls.collection_name
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@classmethod
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def _add_self_referential_link(cls, ref):
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ref.setdefault('links', {})
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ref['links']['self'] = cls.base_url() + '/' + ref['id']
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@classmethod
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def wrap_member(cls, context, ref):
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cls._add_self_referential_link(ref)
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return {cls.member_name: ref}
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@classmethod
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def wrap_collection(cls, context, refs, hints=None):
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"""Wrap a collection, checking for filtering and pagination.
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Returns the wrapped collection, which includes:
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- Executing any filtering not already carried out
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- Truncate to a set limit if necessary
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- Adds 'self' links in every member
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- Adds 'next', 'self' and 'prev' links for the whole collection.
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:param context: the current context, containing the original url path
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and query string
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:param refs: the list of members of the collection
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:param hints: list hints, containing any relevant filters and limit.
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Any filters already satisfied by managers will have been
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removed
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"""
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# Check if there are any filters in hints that were not
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# handled by the drivers. The driver will not have paginated or
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# limited the output if it found there were filters it was unable to
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# handle.
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if hints is not None:
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refs = cls.filter_by_attributes(refs, hints)
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list_limited, refs = cls.limit(refs, hints)
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for ref in refs:
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cls.wrap_member(context, ref)
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container = {cls.collection_name: refs}
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container['links'] = {
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'next': None,
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'self': cls.base_url(path=context['path']),
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'previous': None}
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if list_limited:
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container['truncated'] = True
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return container
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@classmethod
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def limit(cls, refs, hints):
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"""Limits a list of entities.
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The underlying driver layer may have already truncated the collection
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for us, but in case it was unable to handle truncation we check here.
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:param refs: the list of members of the collection
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:param hints: hints, containing, among other things, the limit
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requested
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:returns: boolean indicating whether the list was truncated, as well
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as the list of (truncated if necessary) entities.
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"""
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NOT_LIMITED = False
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LIMITED = True
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if hints is None or hints.get_limit() is None:
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# No truncation was requested
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return NOT_LIMITED, refs
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list_limit = hints.get_limit()
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if list_limit.get('truncated', False):
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# The driver did truncate the list
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return LIMITED, refs
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if len(refs) > list_limit['limit']:
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# The driver layer wasn't able to truncate it for us, so we must
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# do it here
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return LIMITED, refs[:list_limit['limit']]
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return NOT_LIMITED, refs
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@classmethod
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def filter_by_attributes(cls, refs, hints):
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"""Filters a list of references by filter values."""
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def _attr_match(ref_attr, val_attr):
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"""Matches attributes allowing for booleans as strings.
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We test explicitly for a value that defines it as 'False',
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which also means that the existence of the attribute with
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no value implies 'True'
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"""
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if type(ref_attr) is bool:
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return ref_attr == utils.attr_as_boolean(val_attr)
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else:
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return ref_attr == val_attr
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def _inexact_attr_match(filter, ref):
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"""Applies an inexact filter to a result dict.
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:param filter: the filter in question
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:param ref: the dict to check
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:returns True if there is a match
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"""
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comparator = filter['comparator']
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key = filter['name']
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if key in ref:
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filter_value = filter['value']
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target_value = ref[key]
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if not filter['case_sensitive']:
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# We only support inexact filters on strings so
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# it's OK to use lower()
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filter_value = filter_value.lower()
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target_value = target_value.lower()
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if comparator == 'contains':
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return (filter_value in target_value)
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elif comparator == 'startswith':
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return target_value.startswith(filter_value)
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elif comparator == 'endswith':
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return target_value.endswith(filter_value)
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else:
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# We silently ignore unsupported filters
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return True
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return False
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for filter in hints.filters():
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if filter['comparator'] == 'equals':
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attr = filter['name']
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value = filter['value']
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refs = [r for r in refs if _attr_match(
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authorization.flatten(r).get(attr), value)]
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else:
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# It might be an inexact filter
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refs = [r for r in refs if _inexact_attr_match(
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filter, r)]
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return refs
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@classmethod
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def build_driver_hints(cls, context, supported_filters):
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"""Build list hints based on the context query string.
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:param context: contains the query_string from which any list hints can
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be extracted
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:param supported_filters: list of filters supported, so ignore any
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keys in query_dict that are not in this list.
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"""
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query_dict = context['query_string']
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hints = driver_hints.Hints()
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if query_dict is None:
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return hints
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for key in query_dict:
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# Check if this is an exact filter
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if supported_filters is None or key in supported_filters:
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hints.add_filter(key, query_dict[key])
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continue
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# Check if it is an inexact filter
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for valid_key in supported_filters:
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# See if this entry in query_dict matches a known key with an
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# inexact suffix added. If it doesn't match, then that just
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# means that there is no inexact filter for that key in this
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# query.
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if not key.startswith(valid_key + '__'):
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continue
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base_key, comparator = key.split('__', 1)
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# We map the query-style inexact of, for example:
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#
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# {'email__contains', 'myISP'}
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#
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# into a list directive add filter call parameters of:
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#
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# name = 'email'
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# value = 'myISP'
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# comparator = 'contains'
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# case_sensitive = True
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case_sensitive = True
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if comparator.startswith('i'):
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case_sensitive = False
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comparator = comparator[1:]
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hints.add_filter(base_key, query_dict[key],
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comparator=comparator,
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case_sensitive=case_sensitive)
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# NOTE(henry-nash): If we were to support pagination, we would pull any
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# pagination directives out of the query_dict here, and add them into
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# the hints list.
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return hints
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def _require_matching_id(self, value, ref):
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"""Ensures the value matches the reference's ID, if any."""
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if 'id' in ref and ref['id'] != value:
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raise exception.ValidationError('Cannot change ID')
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def _require_matching_domain_id(self, ref_id, ref, get_member):
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"""Ensure the current domain ID matches the reference one, if any.
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Provided we want domain IDs to be immutable, check whether any
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domain_id specified in the ref dictionary matches the existing
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domain_id for this entity.
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:param ref_id: the ID of the entity
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:param ref: the dictionary of new values proposed for this entity
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:param get_member: The member function to call to get the current
|
|
entity
|
|
:raises: :class:`keystone.exception.ValidationError`
|
|
|
|
"""
|
|
# TODO(henry-nash): It might be safer and more efficient to do this
|
|
# check in the managers affected, so look to migrate this check to
|
|
# there in the future.
|
|
if CONF.domain_id_immutable and 'domain_id' in ref:
|
|
existing_ref = get_member(ref_id)
|
|
if ref['domain_id'] != existing_ref['domain_id']:
|
|
raise exception.ValidationError(_('Cannot change Domain ID'))
|
|
|
|
def _assign_unique_id(self, ref):
|
|
"""Generates and assigns a unique identifer to a reference."""
|
|
ref = ref.copy()
|
|
ref['id'] = uuid.uuid4().hex
|
|
return ref
|
|
|
|
def _get_domain_id_for_request(self, context):
|
|
"""Get the domain_id for a v3 call."""
|
|
|
|
if context['is_admin']:
|
|
return CONF.identity.default_domain_id
|
|
|
|
# Fish the domain_id out of the token
|
|
#
|
|
# We could make this more efficient by loading the domain_id
|
|
# into the context in the wrapper function above (since
|
|
# this version of normalize_domain will only be called inside
|
|
# a v3 protected call). However, this optimization is probably not
|
|
# worth the duplication of state
|
|
try:
|
|
token_ref = self.token_api.get_token(context['token_id'])
|
|
except exception.TokenNotFound:
|
|
LOG.warning(_('Invalid token in _get_domain_id_for_request'))
|
|
raise exception.Unauthorized()
|
|
|
|
if 'domain' in token_ref:
|
|
return token_ref['domain']['id']
|
|
else:
|
|
return CONF.identity.default_domain_id
|
|
|
|
def _normalize_domain_id(self, context, ref):
|
|
"""Fill in domain_id if not specified in a v3 call."""
|
|
if 'domain_id' not in ref:
|
|
ref['domain_id'] = self._get_domain_id_for_request(context)
|
|
return ref
|
|
|
|
@staticmethod
|
|
def filter_domain_id(ref):
|
|
"""Override v2 filter to let domain_id out for v3 calls."""
|
|
return ref
|
|
|
|
def check_protection(self, context, prep_info, target_attr=None):
|
|
"""Provide call protection for complex target attributes.
|
|
|
|
As well as including the standard parameters from the original API
|
|
call (which is passed in prep_info), this call will add in any
|
|
additional entities or attributes (passed in target_attr), so that
|
|
they can be referenced by policy rules.
|
|
|
|
"""
|
|
if 'is_admin' in context and context['is_admin']:
|
|
LOG.warning(_('RBAC: Bypassing authorization'))
|
|
else:
|
|
action = 'identity:%s' % prep_info['f_name']
|
|
# TODO(henry-nash) need to log the target attributes as well
|
|
creds = _build_policy_check_credentials(self, action,
|
|
context,
|
|
prep_info['input_attr'])
|
|
# Build the dict the policy engine will check against from both the
|
|
# parameters passed into the call we are protecting (which was
|
|
# stored in the prep_info by protected()), plus the target
|
|
# attributes provided.
|
|
policy_dict = {}
|
|
if target_attr:
|
|
policy_dict = {'target': target_attr}
|
|
policy_dict.update(prep_info['input_attr'])
|
|
self.policy_api.enforce(creds,
|
|
action,
|
|
authorization.flatten(policy_dict))
|
|
LOG.debug(_('RBAC: Authorization granted'))
|
|
|
|
@classmethod
|
|
def check_immutable_params(cls, ref):
|
|
"""Raise exception when disallowed parameter is in ref.
|
|
|
|
Check whether the ref dictionary representing a request has only
|
|
mutable parameters included. If not, raise an exception. This method
|
|
checks only root-level keys from a ref dictionary.
|
|
|
|
:param ref: a dictionary representing deserialized request to be
|
|
stored
|
|
:raises: :class:`keystone.exception.ImmutableAttributeError`
|
|
|
|
"""
|
|
ref_keys = set(ref.keys())
|
|
blocked_keys = ref_keys.difference(cls._mutable_parameters)
|
|
|
|
if not blocked_keys:
|
|
#No immutable parameters changed
|
|
return
|
|
|
|
exception_args = {'target': cls.__name__,
|
|
'attribute': blocked_keys.pop()}
|
|
raise exception.ImmutableAttributeError(**exception_args)
|
|
|
|
@classmethod
|
|
def check_required_params(cls, ref):
|
|
"""Raise exception when required parameter is not in ref.
|
|
|
|
Check whether the ref dictionary representing a request has the
|
|
required parameters to fulfill the request. If not, raise an
|
|
exception. This method checks only root-level keys from a ref
|
|
dictionary.
|
|
|
|
:param ref: a dictionary representing deserialized request to be
|
|
stored
|
|
:raises: :class:`keystone.exception.ValidationError`
|
|
|
|
"""
|
|
ref_keys = set(ref.keys())
|
|
missing_args = []
|
|
|
|
for required in cls._required_parameters:
|
|
if required not in ref_keys:
|
|
missing_args.append(required)
|
|
|
|
if len(missing_args) > 0:
|
|
exception_args = {'target': cls.__name__,
|
|
'attribute': missing_args.pop()}
|
|
raise exception.ValidationError(**exception_args)
|
|
else:
|
|
return
|
|
|
|
@classmethod
|
|
def filter_params(cls, ref):
|
|
"""Remove unspecified parameters from the dictionary.
|
|
|
|
This function removes unspecified parameters from the dictionary. See
|
|
check_immutable_parameters for corresponding function that raises
|
|
exceptions. This method checks only root-level keys from a ref
|
|
dictionary.
|
|
|
|
:param ref: a dictionary representing deserialized response to be
|
|
serialized
|
|
"""
|
|
ref_keys = set(ref.keys())
|
|
blocked_keys = ref_keys - cls._public_parameters
|
|
for blocked_param in blocked_keys:
|
|
del ref[blocked_param]
|
|
return ref
|