123 lines
4.3 KiB
Python
123 lines
4.3 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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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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from heat.common import exception
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from heat.common import utils
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from heat.common import wsgi
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from heat.openstack.common import cfg
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class RequestContext(object):
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"""
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Stores information about the security context under which the user
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accesses the system, as well as additional request information.
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"""
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def __init__(self, auth_tok=None, user=None, tenant=None, roles=None,
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is_admin=False, read_only=False, show_deleted=False,
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owner_is_tenant=True):
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self.auth_tok = auth_tok
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self.user = user
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self.tenant = tenant
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self.roles = roles or []
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self.is_admin = is_admin
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self.read_only = read_only
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self._show_deleted = show_deleted
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self.owner_is_tenant = owner_is_tenant
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@property
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def owner(self):
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"""Return the owner to correlate with an image."""
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return self.tenant if self.owner_is_tenant else self.user
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@property
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def show_deleted(self):
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"""Admins can see deleted by default"""
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if self._show_deleted or self.is_admin:
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return True
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return False
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class ContextMiddleware(wsgi.Middleware):
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opts = [
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cfg.BoolOpt('owner_is_tenant', default=True),
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]
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def __init__(self, app, conf, **local_conf):
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self.conf = conf
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self.conf.register_opts(self.opts)
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# Determine the context class to use
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self.ctxcls = RequestContext
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if 'context_class' in local_conf:
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self.ctxcls = utils.import_class(local_conf['context_class'])
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super(ContextMiddleware, self).__init__(app)
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def make_context(self, *args, **kwargs):
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"""
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Create a context with the given arguments.
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"""
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kwargs.setdefault('owner_is_tenant', self.conf.owner_is_tenant)
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return self.ctxcls(*args, **kwargs)
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def process_request(self, req):
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"""
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Extract any authentication information in the request and
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construct an appropriate context from it.
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A few scenarios exist:
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1. If X-Auth-Token is passed in, then consult TENANT and ROLE headers
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to determine permissions.
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2. An X-Auth-Token was passed in, but the Identity-Status is not
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confirmed. For now, just raising a NotAuthorized exception.
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3. X-Auth-Token is omitted. If we were using Keystone, then the
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tokenauth middleware would have rejected the request, so we must be
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using NoAuth. In that case, assume that is_admin=True.
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"""
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# TODO(sirp): should we be using the heat_tokeauth shim from
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# Keystone here? If we do, we need to make sure it handles the NoAuth
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# case
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auth_tok = req.headers.get('X-Auth-Token',
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req.headers.get('X-Storage-Token'))
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if auth_tok:
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if req.headers.get('X-Identity-Status') == 'Confirmed':
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# 1. Auth-token is passed, check other headers
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user = req.headers.get('X-User')
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tenant = req.headers.get('X-Tenant')
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roles = [r.strip()
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for r in req.headers.get('X-Role', '').split(',')]
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is_admin = 'Admin' in roles
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else:
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# 2. Indentity-Status not confirmed
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# FIXME(sirp): not sure what the correct behavior in this case
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# is; just raising NotAuthorized for now
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raise exception.NotAuthorized()
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else:
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# 3. Auth-token is ommited, assume NoAuth
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user = None
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tenant = None
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roles = []
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is_admin = True
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req.context = self.make_context(
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auth_tok=auth_tok, user=user, tenant=tenant, roles=roles,
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is_admin=is_admin)
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