334 lines
12 KiB
Python
334 lines
12 KiB
Python
# Copyright 2011 OpenStack Foundation
|
|
# Copyright 2010 United States Government as represented by the
|
|
# Administrator of the National Aeronautics and Space Administration.
|
|
# 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.
|
|
|
|
"""RequestContext: context for requests that persist through all of nova."""
|
|
|
|
from contextlib import contextmanager
|
|
import copy
|
|
|
|
from keystoneauth1.access import service_catalog as ksa_service_catalog
|
|
from keystoneauth1 import plugin
|
|
from oslo_context import context
|
|
from oslo_db.sqlalchemy import enginefacade
|
|
from oslo_log import log as logging
|
|
from oslo_utils import timeutils
|
|
import six
|
|
|
|
from nova import exception
|
|
from nova.i18n import _
|
|
from nova import policy
|
|
from nova import utils
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
|
|
class _ContextAuthPlugin(plugin.BaseAuthPlugin):
|
|
"""A keystoneauth auth plugin that uses the values from the Context.
|
|
|
|
Ideally we would use the plugin provided by auth_token middleware however
|
|
this plugin isn't serialized yet so we construct one from the serialized
|
|
auth data.
|
|
"""
|
|
|
|
def __init__(self, auth_token, sc):
|
|
super(_ContextAuthPlugin, self).__init__()
|
|
|
|
self.auth_token = auth_token
|
|
self.service_catalog = ksa_service_catalog.ServiceCatalogV2(sc)
|
|
|
|
def get_token(self, *args, **kwargs):
|
|
return self.auth_token
|
|
|
|
def get_endpoint(self, session, service_type=None, interface=None,
|
|
region_name=None, service_name=None, **kwargs):
|
|
return self.service_catalog.url_for(service_type=service_type,
|
|
service_name=service_name,
|
|
interface=interface,
|
|
region_name=region_name)
|
|
|
|
|
|
@enginefacade.transaction_context_provider
|
|
class RequestContext(context.RequestContext):
|
|
"""Security context and request information.
|
|
|
|
Represents the user taking a given action within the system.
|
|
|
|
"""
|
|
|
|
def __init__(self, user_id=None, project_id=None, is_admin=None,
|
|
read_deleted="no", remote_address=None, timestamp=None,
|
|
quota_class=None, user_name=None, project_name=None,
|
|
service_catalog=None, instance_lock_checked=False,
|
|
user_auth_plugin=None, **kwargs):
|
|
""":param read_deleted: 'no' indicates deleted records are hidden,
|
|
'yes' indicates deleted records are visible,
|
|
'only' indicates that *only* deleted records are visible.
|
|
|
|
:param overwrite: Set to False to ensure that the greenthread local
|
|
copy of the index is not overwritten.
|
|
|
|
:param user_auth_plugin: The auth plugin for the current request's
|
|
authentication data.
|
|
"""
|
|
if user_id:
|
|
kwargs['user'] = user_id
|
|
if project_id:
|
|
kwargs['tenant'] = project_id
|
|
|
|
super(RequestContext, self).__init__(is_admin=is_admin, **kwargs)
|
|
|
|
# FIXME(dims): user_id and project_id duplicate information that is
|
|
# already present in the oslo_context's RequestContext. We need to
|
|
# get rid of them.
|
|
self.user_id = user_id
|
|
self.project_id = project_id
|
|
self.read_deleted = read_deleted
|
|
self.remote_address = remote_address
|
|
if not timestamp:
|
|
timestamp = timeutils.utcnow()
|
|
if isinstance(timestamp, six.string_types):
|
|
timestamp = timeutils.parse_strtime(timestamp)
|
|
self.timestamp = timestamp
|
|
|
|
if service_catalog:
|
|
# Only include required parts of service_catalog
|
|
self.service_catalog = [s for s in service_catalog
|
|
if s.get('type') in ('volume', 'volumev2', 'key-manager')]
|
|
else:
|
|
# if list is empty or none
|
|
self.service_catalog = []
|
|
|
|
self.instance_lock_checked = instance_lock_checked
|
|
|
|
# NOTE(markmc): this attribute is currently only used by the
|
|
# rs_limits turnstile pre-processor.
|
|
# See https://lists.launchpad.net/openstack/msg12200.html
|
|
self.quota_class = quota_class
|
|
self.user_name = user_name
|
|
self.project_name = project_name
|
|
|
|
# NOTE(dheeraj): The following attributes are used by cellsv2 to store
|
|
# connection information for connecting to the target cell.
|
|
# It is only manipulated using the target_cell contextmanager
|
|
# provided by this module
|
|
self.db_connection = None
|
|
self.mq_connection = None
|
|
|
|
self.user_auth_plugin = user_auth_plugin
|
|
if self.is_admin is None:
|
|
self.is_admin = policy.check_is_admin(self)
|
|
|
|
def get_auth_plugin(self):
|
|
if self.user_auth_plugin:
|
|
return self.user_auth_plugin
|
|
else:
|
|
return _ContextAuthPlugin(self.auth_token, self.service_catalog)
|
|
|
|
def _get_read_deleted(self):
|
|
return self._read_deleted
|
|
|
|
def _set_read_deleted(self, read_deleted):
|
|
if read_deleted not in ('no', 'yes', 'only'):
|
|
raise ValueError(_("read_deleted can only be one of 'no', "
|
|
"'yes' or 'only', not %r") % read_deleted)
|
|
self._read_deleted = read_deleted
|
|
|
|
def _del_read_deleted(self):
|
|
del self._read_deleted
|
|
|
|
read_deleted = property(_get_read_deleted, _set_read_deleted,
|
|
_del_read_deleted)
|
|
|
|
def to_dict(self):
|
|
values = super(RequestContext, self).to_dict()
|
|
# FIXME(dims): defensive hasattr() checks need to be
|
|
# removed once we figure out why we are seeing stack
|
|
# traces
|
|
values.update({
|
|
'user_id': getattr(self, 'user_id', None),
|
|
'project_id': getattr(self, 'project_id', None),
|
|
'is_admin': getattr(self, 'is_admin', None),
|
|
'read_deleted': getattr(self, 'read_deleted', 'no'),
|
|
'remote_address': getattr(self, 'remote_address', None),
|
|
'timestamp': utils.strtime(self.timestamp) if hasattr(
|
|
self, 'timestamp') else None,
|
|
'request_id': getattr(self, 'request_id', None),
|
|
'quota_class': getattr(self, 'quota_class', None),
|
|
'user_name': getattr(self, 'user_name', None),
|
|
'service_catalog': getattr(self, 'service_catalog', None),
|
|
'project_name': getattr(self, 'project_name', None),
|
|
'instance_lock_checked': getattr(self, 'instance_lock_checked',
|
|
False)
|
|
})
|
|
return values
|
|
|
|
@classmethod
|
|
def from_dict(cls, values):
|
|
return cls(
|
|
user_id=values.get('user_id'),
|
|
user=values.get('user'),
|
|
project_id=values.get('project_id'),
|
|
tenant=values.get('tenant'),
|
|
is_admin=values.get('is_admin'),
|
|
read_deleted=values.get('read_deleted', 'no'),
|
|
roles=values.get('roles'),
|
|
remote_address=values.get('remote_address'),
|
|
timestamp=values.get('timestamp'),
|
|
request_id=values.get('request_id'),
|
|
auth_token=values.get('auth_token'),
|
|
quota_class=values.get('quota_class'),
|
|
user_name=values.get('user_name'),
|
|
project_name=values.get('project_name'),
|
|
service_catalog=values.get('service_catalog'),
|
|
instance_lock_checked=values.get('instance_lock_checked', False),
|
|
)
|
|
|
|
def elevated(self, read_deleted=None):
|
|
"""Return a version of this context with admin flag set."""
|
|
context = copy.copy(self)
|
|
# context.roles must be deepcopied to leave original roles
|
|
# without changes
|
|
context.roles = copy.deepcopy(self.roles)
|
|
context.is_admin = True
|
|
|
|
if 'admin' not in context.roles:
|
|
context.roles.append('admin')
|
|
|
|
if read_deleted is not None:
|
|
context.read_deleted = read_deleted
|
|
|
|
return context
|
|
|
|
def can(self, rule, target=None, fatal=True):
|
|
"""Verifies that the given rule 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 nova.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 = {'project_id': self.project_id,
|
|
'user_id': self.user_id}
|
|
|
|
try:
|
|
return policy.authorize(self, rule, target)
|
|
except exception.Forbidden:
|
|
if fatal:
|
|
raise
|
|
return False
|
|
|
|
def __str__(self):
|
|
return "<Context %s>" % self.to_dict()
|
|
|
|
|
|
def get_admin_context(read_deleted="no"):
|
|
return RequestContext(user_id=None,
|
|
project_id=None,
|
|
is_admin=True,
|
|
read_deleted=read_deleted,
|
|
overwrite=False)
|
|
|
|
|
|
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 require_admin_context(ctxt):
|
|
"""Raise exception.AdminRequired() if context is not an admin context."""
|
|
if not ctxt.is_admin:
|
|
raise exception.AdminRequired()
|
|
|
|
|
|
def require_context(ctxt):
|
|
"""Raise exception.Forbidden() if context is not a user or an
|
|
admin context.
|
|
"""
|
|
if not ctxt.is_admin and not is_user_context(ctxt):
|
|
raise exception.Forbidden()
|
|
|
|
|
|
def authorize_project_context(context, project_id):
|
|
"""Ensures a request has permission to access the given project."""
|
|
if is_user_context(context):
|
|
if not context.project_id:
|
|
raise exception.Forbidden()
|
|
elif context.project_id != project_id:
|
|
raise exception.Forbidden()
|
|
|
|
|
|
def authorize_user_context(context, user_id):
|
|
"""Ensures a request has permission to access the given user."""
|
|
if is_user_context(context):
|
|
if not context.user_id:
|
|
raise exception.Forbidden()
|
|
elif context.user_id != user_id:
|
|
raise exception.Forbidden()
|
|
|
|
|
|
def authorize_quota_class_context(context, class_name):
|
|
"""Ensures a request has permission to access the given quota class."""
|
|
if is_user_context(context):
|
|
if not context.quota_class:
|
|
raise exception.Forbidden()
|
|
elif context.quota_class != class_name:
|
|
raise exception.Forbidden()
|
|
|
|
|
|
@contextmanager
|
|
def target_cell(context, cell_mapping):
|
|
"""Adds database and message queue connection information to the context
|
|
for communicating with the given target cell.
|
|
|
|
:param context: The RequestContext to add connection information
|
|
:param cell_mapping: A objects.CellMapping object
|
|
"""
|
|
original_db_connection = context.db_connection
|
|
original_mq_connection = context.mq_connection
|
|
# avoid circular imports
|
|
from nova import db
|
|
from nova import rpc
|
|
db_connection_string = cell_mapping.database_connection
|
|
context.db_connection = db.create_context_manager(db_connection_string)
|
|
# NOTE(melwitt): none:// url is a special value meaning do not switch
|
|
if not cell_mapping.transport_url.startswith('none'):
|
|
transport_url = cell_mapping.transport_url
|
|
context.mq_connection = rpc.create_transport(transport_url)
|
|
|
|
try:
|
|
yield context
|
|
finally:
|
|
context.db_connection = original_db_connection
|
|
context.mq_connection = original_mq_connection
|