190 lines
6.4 KiB
Python
190 lines
6.4 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
|
|
# Copyright 2011 OpenStack LLC.
|
|
# 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.
|
|
|
|
from glance.common import exception
|
|
from glance.common import wsgi
|
|
from glance.openstack.common import cfg
|
|
from glance.registry.db import api as db_api
|
|
|
|
|
|
class RequestContext(object):
|
|
"""
|
|
Stores information about the security context under which the user
|
|
accesses the system, as well as additional request information.
|
|
"""
|
|
|
|
def __init__(self, auth_tok=None, user=None, tenant=None, roles=None,
|
|
is_admin=False, read_only=False, show_deleted=False,
|
|
owner_is_tenant=True):
|
|
self.auth_tok = auth_tok
|
|
self.user = user
|
|
self.tenant = tenant
|
|
self.roles = roles or []
|
|
self.is_admin = is_admin
|
|
self.read_only = read_only
|
|
self._show_deleted = show_deleted
|
|
self.owner_is_tenant = owner_is_tenant
|
|
|
|
@property
|
|
def owner(self):
|
|
"""Return the owner to correlate with an image."""
|
|
return self.tenant if self.owner_is_tenant else self.user
|
|
|
|
@property
|
|
def show_deleted(self):
|
|
"""Admins can see deleted by default"""
|
|
if self._show_deleted or self.is_admin:
|
|
return True
|
|
return False
|
|
|
|
def is_image_visible(self, image):
|
|
"""Return True if the image is visible in this context."""
|
|
# Is admin == image visible
|
|
if self.is_admin:
|
|
return True
|
|
|
|
# No owner == image visible
|
|
if image.owner is None:
|
|
return True
|
|
|
|
# Image is_public == image visible
|
|
if image.is_public:
|
|
return True
|
|
|
|
# Perform tests based on whether we have an owner
|
|
if self.owner is not None:
|
|
if self.owner == image.owner:
|
|
return True
|
|
|
|
# Figure out if this image is shared with that tenant
|
|
try:
|
|
tmp = db_api.image_member_find(self, image.id, self.owner)
|
|
return not tmp['deleted']
|
|
except exception.NotFound:
|
|
pass
|
|
|
|
# Private image
|
|
return False
|
|
|
|
def is_image_mutable(self, image):
|
|
"""Return True if the image is mutable in this context."""
|
|
# Is admin == image mutable
|
|
if self.is_admin:
|
|
return True
|
|
|
|
# No owner == image not mutable
|
|
if image.owner is None or self.owner is None:
|
|
return False
|
|
|
|
# Image only mutable by its owner
|
|
return image.owner == self.owner
|
|
|
|
def is_image_sharable(self, image, **kwargs):
|
|
"""Return True if the image can be shared to others in this context."""
|
|
# Only allow sharing if we have an owner
|
|
if self.owner is None:
|
|
return False
|
|
|
|
# Is admin == image sharable
|
|
if self.is_admin:
|
|
return True
|
|
|
|
# If we own the image, we can share it
|
|
if self.owner == image.owner:
|
|
return True
|
|
|
|
# Let's get the membership association
|
|
if 'membership' in kwargs:
|
|
membership = kwargs['membership']
|
|
if membership is None:
|
|
# Not shared with us anyway
|
|
return False
|
|
else:
|
|
try:
|
|
membership = db_api.image_member_find(self, image.id,
|
|
self.owner)
|
|
except exception.NotFound:
|
|
# Not shared with us anyway
|
|
return False
|
|
|
|
# It's the can_share attribute we're now interested in
|
|
return membership.can_share
|
|
|
|
|
|
class ContextMiddleware(wsgi.Middleware):
|
|
|
|
opts = [
|
|
cfg.BoolOpt('owner_is_tenant', default=True),
|
|
cfg.StrOpt('admin_role', default='admin'),
|
|
]
|
|
|
|
def __init__(self, app, conf, **local_conf):
|
|
self.conf = conf
|
|
self.conf.register_opts(self.opts)
|
|
super(ContextMiddleware, self).__init__(app)
|
|
|
|
def make_context(self, *args, **kwargs):
|
|
"""
|
|
Create a context with the given arguments.
|
|
"""
|
|
kwargs.setdefault('owner_is_tenant', self.conf.owner_is_tenant)
|
|
|
|
return RequestContext(*args, **kwargs)
|
|
|
|
def process_request(self, req):
|
|
"""
|
|
Extract any authentication information in the request and
|
|
construct an appropriate context from it.
|
|
|
|
A few scenarios exist:
|
|
|
|
1. If X-Auth-Token is passed in, then consult TENANT and ROLE headers
|
|
to determine permissions.
|
|
|
|
2. An X-Auth-Token was passed in, but the Identity-Status is not
|
|
confirmed. For now, just raising a NotAuthenticated exception.
|
|
|
|
3. X-Auth-Token is omitted. If we were using Keystone, then the
|
|
tokenauth middleware would have rejected the request, so we must be
|
|
using NoAuth. In that case, assume that is_admin=True.
|
|
"""
|
|
auth_tok = req.headers.get('X-Auth-Token',
|
|
req.headers.get('X-Storage-Token'))
|
|
if auth_tok:
|
|
if req.headers.get('X-Identity-Status') == 'Confirmed':
|
|
# 1. Auth-token is passed, check other headers
|
|
user = req.headers.get('X-User-Id')
|
|
tenant = req.headers.get('X-Tenant-Id')
|
|
roles = [r.strip()
|
|
for r in req.headers.get('X-Roles', '').split(',')]
|
|
is_admin = self.conf.admin_role in roles
|
|
else:
|
|
# 2. Indentity-Status not confirmed
|
|
# FIXME(sirp): not sure what the correct behavior in this case
|
|
# is; just raising NotAuthenticated for now
|
|
raise exception.NotAuthenticated()
|
|
else:
|
|
# 3. Auth-token is ommited, assume NoAuth
|
|
user = None
|
|
tenant = None
|
|
roles = []
|
|
is_admin = True
|
|
|
|
req.context = self.make_context(
|
|
auth_tok=auth_tok, user=user, tenant=tenant, roles=roles,
|
|
is_admin=is_admin)
|