Tacker: ETSI MANO NFV Orchestrator / VNF Manager. See https://wiki.openstack.org/wiki/Tacker
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# Copyright 2012 OpenStack Foundation.
# All Rights Reserved.
#
# 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.
"""Context: context for security/db session."""
import copy
import datetime
from castellan.common.credentials import keystone_password
from oslo_config import cfg
from oslo_context import context as oslo_context
from oslo_db.sqlalchemy import enginefacade
from tacker.common import exceptions
from tacker.db import api as db_api
from tacker import policy
CONF = cfg.CONF
class ContextBase(oslo_context.RequestContext):
"""Security context and request information.
Represents the user taking a given action within the system.
"""
def __init__(self, user_id=None, tenant_id=None, is_admin=None,
timestamp=None, tenant_name=None, user_name=None,
is_advsvc=None, **kwargs):
# NOTE(jamielennox): We maintain this argument in order for tests that
# pass arguments positionally.
kwargs.setdefault('project_id', tenant_id)
# prefer project_name, as that's what's going to be set by
# keystone. Fall back to tenant_name if for some reason it's blank.
kwargs.setdefault('project_name', tenant_name)
super(ContextBase, self).__init__(
is_admin=is_admin, user_id=user_id, **kwargs)
self.user_name = user_name
if not timestamp:
timestamp = datetime.datetime.utcnow()
self.timestamp = timestamp
# self.is_advsvc = is_advsvc
# if self.is_advsvc is None:
# self.is_advsvc = self.is_admin or policy.check_is_advsvc(self)
if self.is_admin is None:
self.is_admin = policy.check_is_admin(self)
@property
def project_id(self):
return self.tenant
@property
def tenant_id(self):
return self.tenant
@tenant_id.setter
def tenant_id(self, tenant_id):
self.tenant = tenant_id
@property
def tenant_name(self):
return self.project_name
@tenant_name.setter
def tenant_name(self, tenant_name):
self.project_name = tenant_name
@property
def user_id(self):
return self.user
@user_id.setter
def user_id(self, user_id):
self.user = user_id
def to_dict(self):
context = super(ContextBase, self).to_dict()
context.update({
'user_id': self.user_id,
'tenant_id': self.tenant_id,
'project_id': self.project_id,
'timestamp': str(self.timestamp),
'tenant_name': self.tenant_name,
'project_name': self.tenant_name,
'user_name': self.user_name,
})
return context
@classmethod
def from_dict(cls, values):
return cls(user_id=values.get('user_id', values.get('user')),
tenant_id=values.get('tenant_id', values.get('project_id')),
is_admin=values.get('is_admin'),
roles=values.get('roles'),
timestamp=values.get('timestamp'),
request_id=values.get('request_id'),
tenant_name=values.get('tenant_name'),
user_name=values.get('user_name'),
auth_token=values.get('auth_token'))
def to_policy_values(self):
values = super(ContextBase, self).to_policy_values()
values['tenant_id'] = self.project_id
values['is_admin'] = self.is_admin
# NOTE(jamielennox): These are almost certainly unused and non-standard
# but kept for backwards compatibility. Remove them in Pike
# (oslo.context from Ocata release already issues deprecation warnings
# for non-standard keys).
values['user'] = self.user_id
values['tenant'] = self.project_id
values['domain'] = self.domain_id
values['user_domain'] = self.user_domain_id
values['project_domain'] = self.project_domain_id
values['tenant_name'] = self.project_name
values['project_name'] = self.project_name
values['user_name'] = self.user_name
return values
def elevated(self):
"""Return a version of this context with admin flag set."""
context = copy.copy(self)
context.is_admin = True
if 'admin' not in [x.lower() for x in context.roles]:
context.roles = context.roles + ["admin"]
return context
def can(self, action, target=None, fatal=True):
"""Verifies that the given action is valid on the target in this context.
:param action: string representing the action to be checked.
:param target: dictionary representing the object of the action
for object creation this should be a dictionary representing the
location of the object e.g. ``{'project_id': context.project_id}``.
If None, then this default target will be considered:
{'project_id': self.project_id, 'user_id': self.user_id}
:param fatal: if False, will return False when an exception.Forbidden
occurs.
:raises tacker.exception.Forbidden: if verification fails and fatal
is True.
:return: returns a non-False value (not necessarily "True") if
authorized and False if not authorized and fatal is False.
"""
if target is None:
target = {'tenant_id': self.tenant_id,
'user_id': self.user_id}
try:
return policy.authorize(self, action, target)
except exceptions.Forbidden:
if fatal:
raise
return False
@enginefacade.transaction_context_provider
class ContextBaseWithSession(ContextBase):
pass
class Context(ContextBaseWithSession):
def __init__(self, *args, **kwargs):
super(Context, self).__init__(*args, **kwargs)
self._session = None
@property
def session(self):
# TODO(akamyshnikova): checking for session attribute won't be needed
# when reader and writer will be used
if hasattr(super(Context, self), 'session'):
return super(Context, self).session
if self._session is None:
self._session = db_api.get_session()
return self._session
def get_admin_context():
return Context(user_id=None,
tenant_id=None,
is_admin=True,
overwrite=False)
def get_admin_context_without_session():
return ContextBase(user_id=None,
tenant_id=None,
is_admin=True)
def is_user_context(context):
"""Indicates if the request context is a normal user."""
if not context:
return False
if context.is_admin:
return False
if not context.user_id or not context.project_id:
return False
return True
def generate_tacker_service_context():
return keystone_password.KeystonePassword(
password=CONF.keystone_authtoken.password,
auth_url=CONF.keystone_authtoken.auth_url,
username=CONF.keystone_authtoken.username,
user_domain_name=CONF.keystone_authtoken.user_domain_name,
project_name=CONF.keystone_authtoken.project_name,
project_domain_name=CONF.keystone_authtoken.project_domain_name)