e3e5812b19
Moves Django OpenStack Auth content to Horizon, since they are so tightly coupled. This cleans up the development workflow and should make keystone / auth related contributions easier. Implements: blueprint merge-openstack-auth Change-Id: Ia1cdc47bad1ca6e633073a9f9445b0c7f70d05bc
232 lines
8.6 KiB
Python
232 lines
8.6 KiB
Python
#
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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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"""Policy engine for openstack_auth"""
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import logging
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import os.path
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from django.conf import settings
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from oslo_config import cfg
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from oslo_policy import opts as policy_opts
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from oslo_policy import policy
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from openstack_auth import user as auth_user
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from openstack_auth import utils as auth_utils
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LOG = logging.getLogger(__name__)
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_ENFORCER = None
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_BASE_PATH = getattr(settings, 'POLICY_FILES_PATH', '')
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def _get_policy_conf(policy_file, policy_dirs=None):
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conf = cfg.ConfigOpts()
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# Passing [] is required. Otherwise oslo.config looks up sys.argv.
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conf([])
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policy_opts.set_defaults(conf)
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policy_file = os.path.join(_BASE_PATH, policy_file)
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conf.set_default('policy_file', policy_file, 'oslo_policy')
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# Policy Enforcer has been updated to take in a policy directory
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# as a config option. However, the default value in is set to
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# ['policy.d'] which causes the code to break. Set the default
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# value to empty list for now.
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if policy_dirs is None:
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policy_dirs = []
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policy_dirs = [os.path.join(_BASE_PATH, policy_dir)
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for policy_dir in policy_dirs]
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conf.set_default('policy_dirs', policy_dirs, 'oslo_policy')
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return conf
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def _get_enforcer():
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global _ENFORCER
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if not _ENFORCER:
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_ENFORCER = {}
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policy_files = getattr(settings, 'POLICY_FILES', {})
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policy_dirs = getattr(settings, 'POLICY_DIRS', {})
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for service in policy_files.keys():
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conf = _get_policy_conf(policy_file=policy_files[service],
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policy_dirs=policy_dirs.get(service, []))
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enforcer = policy.Enforcer(conf)
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# Ensure enforcer.policy_path is populated.
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enforcer.load_rules()
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if os.path.isfile(enforcer.policy_path):
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LOG.debug("adding enforcer for service: %s", service)
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_ENFORCER[service] = enforcer
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else:
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LOG.warning("policy file for service: %s not found at %s",
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(service, enforcer.policy_path))
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return _ENFORCER
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def reset():
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global _ENFORCER
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_ENFORCER = None
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def check(actions, request, target=None):
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"""Check user permission.
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Check if the user has permission to the action according
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to policy setting.
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:param actions: list of scope and action to do policy checks on,
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the composition of which is (scope, action). Multiple actions
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are treated as a logical AND.
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* scope: service type managing the policy for action
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* action: string representing the action to be checked
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this should be colon separated for clarity.
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i.e.
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| compute:create_instance
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| compute:attach_volume
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| volume:attach_volume
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for a policy action that requires a single action, actions
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should look like
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| "(("compute", "compute:create_instance"),)"
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for a multiple action check, actions should look like
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| "(("identity", "identity:list_users"),
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| ("identity", "identity:list_roles"))"
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:param request: django http request object. If not specified, credentials
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must be passed.
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:param target: dictionary representing the object of the action
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for object creation this should be a dictionary
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representing the location of the object e.g.
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{'project_id': object.project_id}
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:returns: boolean if the user has permission or not for the actions.
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"""
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if target is None:
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target = {}
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user = auth_utils.get_user(request)
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# Several service policy engines default to a project id check for
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# ownership. Since the user is already scoped to a project, if a
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# different project id has not been specified use the currently scoped
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# project's id.
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#
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# The reason is the operator can edit the local copies of the service
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# policy file. If a rule is removed, then the default rule is used. We
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# don't want to block all actions because the operator did not fully
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# understand the implication of editing the policy file. Additionally,
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# the service APIs will correct us if we are too permissive.
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if target.get('project_id') is None:
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target['project_id'] = user.project_id
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if target.get('tenant_id') is None:
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target['tenant_id'] = target['project_id']
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# same for user_id
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if target.get('user_id') is None:
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target['user_id'] = user.id
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domain_id_keys = [
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'domain_id',
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'project.domain_id',
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'user.domain_id',
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'group.domain_id'
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]
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# populates domain id keys with user's current domain id
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for key in domain_id_keys:
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if target.get(key) is None:
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target[key] = user.user_domain_id
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credentials = _user_to_credentials(user)
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domain_credentials = _domain_to_credentials(request, user)
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# if there is a domain token use the domain_id instead of the user's domain
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if domain_credentials:
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credentials['domain_id'] = domain_credentials.get('domain_id')
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enforcer = _get_enforcer()
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for action in actions:
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scope, action = action[0], action[1]
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if scope in enforcer:
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# this is for handling the v3 policy file and will only be
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# needed when a domain scoped token is present
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if scope == 'identity' and domain_credentials:
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# use domain credentials
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if not _check_credentials(enforcer[scope],
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action,
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target,
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domain_credentials):
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return False
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# use project credentials
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if not _check_credentials(enforcer[scope],
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action, target, credentials):
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return False
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# if no policy for scope, allow action, underlying API will
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# ultimately block the action if not permitted, treat as though
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# allowed
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return True
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def _check_credentials(enforcer_scope, action, target, credentials):
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is_valid = True
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if not enforcer_scope.enforce(action, target, credentials):
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# to match service implementations, if a rule is not found,
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# use the default rule for that service policy
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#
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# waiting to make the check because the first call to
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# enforce loads the rules
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if action not in enforcer_scope.rules:
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if not enforcer_scope.enforce('default', target, credentials):
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is_valid = False
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else:
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is_valid = False
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return is_valid
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def _user_to_credentials(user):
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if not hasattr(user, "_credentials"):
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roles = [role['name'] for role in user.roles]
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user._credentials = {'user_id': user.id,
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'token': user.token,
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'username': user.username,
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'project_id': user.project_id,
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'tenant_id': user.project_id,
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'project_name': user.project_name,
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'domain_id': user.user_domain_id,
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'is_admin': user.is_superuser,
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'roles': roles}
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return user._credentials
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def _domain_to_credentials(request, user):
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if not hasattr(user, "_domain_credentials"):
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try:
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domain_auth_ref = request.session.get('domain_token')
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# no domain role or not running on V3
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if not domain_auth_ref:
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return None
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domain_user = auth_user.create_user_from_token(
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request, auth_user.Token(domain_auth_ref),
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domain_auth_ref.service_catalog.url_for(interface=None))
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user._domain_credentials = _user_to_credentials(domain_user)
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# uses the domain_id associated with the domain_user
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user._domain_credentials['domain_id'] = domain_user.domain_id
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except Exception:
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LOG.warning("Failed to create user from domain scoped token.")
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return None
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return user._domain_credentials
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