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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 sys
from oslo_config import cfg
from oslo_policy import opts
from oslo_policy import policy
_ROLE_ENFORCER = None
_ADMIN_CTX_POLICY = 'context_is_admin'
_ADVSVC_CTX_POLICY = 'context_is_advsvc'
_SERVICE_ROLE = 'service_api'
opts.set_defaults(cfg.CONF)
_BASE_RULES = [
policy.RuleDefault(
_ADMIN_CTX_POLICY,
'role:admin',
description='Rule for cloud admin access'),
policy.RuleDefault(
_ADVSVC_CTX_POLICY,
'role:advsvc',
description='Rule for advanced service role access'),
policy.RuleDefault(
_SERVICE_ROLE,
'role:service',
description='Default rule for the service-to-service APIs.'),
]
def init(conf=cfg.CONF, policy_file=None):
"""Initialize the global enforcer if not already initialized.
Initialize the global enforcer (and load its rules) if not already
initialized; otherwise this is a no-op.
:param conf: The configuration to initialize the global enforcer with.
Defaults to oslo_config.cfg.CONF.
:param policy_file: The policy file to initialize the global enforcer
with.
:returns: None.
"""
global _ROLE_ENFORCER
if not _ROLE_ENFORCER:
_ROLE_ENFORCER = policy.Enforcer(conf, policy_file=policy_file)
# Skip the undefined rule check to avoid unnecessary warning messages.
_ROLE_ENFORCER.skip_undefined_check = True
_ROLE_ENFORCER.register_defaults(_BASE_RULES)
_ROLE_ENFORCER.load_rules(True)
def _check_rule(context, rule):
init()
# the target is user-self
credentials = context.to_policy_values()
try:
return _ROLE_ENFORCER.authorize(rule, credentials, credentials)
except policy.PolicyNotRegistered:
return False
def check_is_admin(context):
"""Verify context has admin rights according to the global policy settings.
:param context: The context object.
:returns: True if the context has admin rights (as per the global
enforcer) and False otherwise.
"""
return _check_rule(context, _ADMIN_CTX_POLICY)
def check_is_advsvc(context):
"""Verify context has advsvc rights according to global policy settings.
:param context: The context object.
:returns: True if the context has advsvc rights (as per the global
enforcer) and False otherwise.
"""
return _check_rule(context, _ADVSVC_CTX_POLICY)
def check_is_service_role(context):
"""Verify context is service role according to global policy settings.
:param context: The context object.
:returns: True if the context is service role (as per the global
enforcer) and False otherwise.
"""
return _check_rule(context, _SERVICE_ROLE)
def list_rules():
return _BASE_RULES
def get_enforcer():
# NOTE(amotoki): This was borrowed from nova/policy.py.
# This method is for use by oslo.policy CLI scripts. Those scripts need the
# 'output-file' and 'namespace' options, but having those in sys.argv means
# loading the neutron config options will fail as those are not expected to
# be present. So we pass in an arg list with those stripped out.
conf_args = []
# Start at 1 because cfg.CONF expects the equivalent of sys.argv[1:]
i = 1
while i < len(sys.argv):
if sys.argv[i].strip('-') in ['namespace', 'output-file']:
i += 2
continue
conf_args.append(sys.argv[i])
i += 1
# 'project' must be 'neutron' so that get_enforcer looks at
# /etc/neutron/policy.yaml by default.
cfg.CONF(conf_args, project='neutron')
init()
return _ROLE_ENFORCER
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