241 lines
8.3 KiB
Python
241 lines
8.3 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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#
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# Copyright 2012 New Dream Network, LLC (DreamHost)
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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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#
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# @author: Mark McClain, DreamHost
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import hashlib
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import hmac
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import os
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import socket
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import urlparse
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import eventlet
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import httplib2
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from neutronclient.v2_0 import client
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from oslo.config import cfg
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import webob
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from neutron.common import config
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from neutron.common import utils
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from neutron.openstack.common import log as logging
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from neutron import wsgi
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LOG = logging.getLogger(__name__)
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DEVICE_OWNER_ROUTER_INTF = "network:router_interface"
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class MetadataProxyHandler(object):
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OPTS = [
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cfg.StrOpt('admin_user',
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help=_("Admin user")),
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cfg.StrOpt('admin_password',
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help=_("Admin password"),
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secret=True),
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cfg.StrOpt('admin_tenant_name',
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help=_("Admin tenant name")),
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cfg.StrOpt('auth_url',
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help=_("Authentication URL")),
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cfg.StrOpt('auth_strategy', default='keystone',
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help=_("The type of authentication to use")),
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cfg.StrOpt('auth_region',
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help=_("Authentication region")),
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cfg.StrOpt('endpoint_type',
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default='adminURL',
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help=_("Network service endpoint type to pull from "
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"the keystone catalog")),
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cfg.StrOpt('nova_metadata_ip', default='127.0.0.1',
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help=_("IP address used by Nova metadata server.")),
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cfg.IntOpt('nova_metadata_port',
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default=8775,
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help=_("TCP Port used by Nova metadata server.")),
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cfg.StrOpt('metadata_proxy_shared_secret',
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default='',
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help=_('Shared secret to sign instance-id request'),
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secret=True)
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]
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def __init__(self, conf):
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self.conf = conf
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self.auth_info = {}
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def _get_neutron_client(self):
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qclient = client.Client(
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username=self.conf.admin_user,
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password=self.conf.admin_password,
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tenant_name=self.conf.admin_tenant_name,
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auth_url=self.conf.auth_url,
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auth_strategy=self.conf.auth_strategy,
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region_name=self.conf.auth_region,
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auth_token=self.auth_info.get('auth_token'),
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endpoint_url=self.auth_info.get('endpoint_url'),
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endpoint_type=self.conf.endpoint_type
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)
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return qclient
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@webob.dec.wsgify(RequestClass=webob.Request)
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def __call__(self, req):
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try:
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LOG.debug(_("Request: %s"), req)
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instance_id = self._get_instance_id(req)
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if instance_id:
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return self._proxy_request(instance_id, req)
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else:
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return webob.exc.HTTPNotFound()
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except Exception:
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LOG.exception(_("Unexpected error."))
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msg = _('An unknown error has occurred. '
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'Please try your request again.')
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return webob.exc.HTTPInternalServerError(explanation=unicode(msg))
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def _get_instance_id(self, req):
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qclient = self._get_neutron_client()
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remote_address = req.headers.get('X-Forwarded-For')
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network_id = req.headers.get('X-Neutron-Network-ID')
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router_id = req.headers.get('X-Neutron-Router-ID')
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if network_id:
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networks = [network_id]
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else:
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internal_ports = qclient.list_ports(
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device_id=router_id,
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device_owner=DEVICE_OWNER_ROUTER_INTF)['ports']
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networks = [p['network_id'] for p in internal_ports]
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ports = qclient.list_ports(
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network_id=networks,
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fixed_ips=['ip_address=%s' % remote_address])['ports']
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self.auth_info = qclient.get_auth_info()
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if len(ports) == 1:
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return ports[0]['device_id']
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def _proxy_request(self, instance_id, req):
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headers = {
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'X-Forwarded-For': req.headers.get('X-Forwarded-For'),
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'X-Instance-ID': instance_id,
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'X-Instance-ID-Signature': self._sign_instance_id(instance_id)
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}
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url = urlparse.urlunsplit((
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'http',
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'%s:%s' % (self.conf.nova_metadata_ip,
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self.conf.nova_metadata_port),
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req.path_info,
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req.query_string,
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''))
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h = httplib2.Http()
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resp, content = h.request(url, method=req.method, headers=headers,
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body=req.body)
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if resp.status == 200:
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LOG.debug(str(resp))
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return content
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elif resp.status == 403:
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msg = _(
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'The remote metadata server responded with Forbidden. This '
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'response usually occurs when shared secrets do not match.'
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)
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LOG.warn(msg)
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return webob.exc.HTTPForbidden()
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elif resp.status == 404:
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return webob.exc.HTTPNotFound()
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elif resp.status == 409:
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return webob.exc.HTTPConflict()
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elif resp.status == 500:
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msg = _(
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'Remote metadata server experienced an internal server error.'
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)
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LOG.warn(msg)
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return webob.exc.HTTPInternalServerError(explanation=unicode(msg))
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else:
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raise Exception(_('Unexpected response code: %s') % resp.status)
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def _sign_instance_id(self, instance_id):
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return hmac.new(self.conf.metadata_proxy_shared_secret,
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instance_id,
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hashlib.sha256).hexdigest()
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class UnixDomainHttpProtocol(eventlet.wsgi.HttpProtocol):
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def __init__(self, request, client_address, server):
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if client_address == '':
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client_address = ('<local>', 0)
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# base class is old-style, so super does not work properly
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eventlet.wsgi.HttpProtocol.__init__(self, request, client_address,
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server)
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class UnixDomainWSGIServer(wsgi.Server):
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def start(self, application, file_socket, backlog=128):
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sock = eventlet.listen(file_socket,
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family=socket.AF_UNIX,
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backlog=backlog)
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self.pool.spawn_n(self._run, application, sock)
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def _run(self, application, socket):
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"""Start a WSGI service in a new green thread."""
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logger = logging.getLogger('eventlet.wsgi.server')
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eventlet.wsgi.server(socket,
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application,
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custom_pool=self.pool,
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protocol=UnixDomainHttpProtocol,
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log=logging.WritableLogger(logger))
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class UnixDomainMetadataProxy(object):
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OPTS = [
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cfg.StrOpt('metadata_proxy_socket',
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default='$state_path/metadata_proxy',
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help=_('Location for Metadata Proxy UNIX domain socket'))
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]
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def __init__(self, conf):
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self.conf = conf
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dirname = os.path.dirname(cfg.CONF.metadata_proxy_socket)
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if os.path.isdir(dirname):
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try:
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os.unlink(cfg.CONF.metadata_proxy_socket)
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except OSError:
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if os.path.exists(cfg.CONF.metadata_proxy_socket):
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raise
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else:
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os.makedirs(dirname, 0o755)
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def run(self):
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server = UnixDomainWSGIServer('neutron-metadata-agent')
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server.start(MetadataProxyHandler(self.conf),
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self.conf.metadata_proxy_socket)
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server.wait()
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def main():
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eventlet.monkey_patch()
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cfg.CONF.register_opts(UnixDomainMetadataProxy.OPTS)
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cfg.CONF.register_opts(MetadataProxyHandler.OPTS)
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cfg.CONF(project='neutron')
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config.setup_logging(cfg.CONF)
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utils.log_opt_values(LOG)
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proxy = UnixDomainMetadataProxy(cfg.CONF)
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proxy.run()
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