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