291 lines
10 KiB
Python
291 lines
10 KiB
Python
# Copyright (c) 2012 Intel, Inc.
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# Copyright (c) 2011-2012 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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"""
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Filter to add support for Trusted Computing Pools.
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Filter that only schedules tasks on a host if the integrity (trust)
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of that host matches the trust requested in the `extra_specs' for the
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flavor. The `extra_specs' will contain a key/value pair where the
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key is `trust'. The value of this pair (`trusted'/`untrusted') must
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match the integrity of that host (obtained from the Attestation
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service) before the task can be scheduled on that host.
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Note that the parameters to control access to the Attestation Service
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are in the `nova.conf' file in a separate `trust' section. For example,
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the config file will look something like:
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[DEFAULT]
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verbose=True
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...
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[trust]
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server=attester.mynetwork.com
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Details on the specific parameters can be found in the file `trust_attest.py'.
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Details on setting up and using an Attestation Service can be found at
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the Open Attestation project at:
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https://github.com/OpenAttestation/OpenAttestation
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"""
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import httplib
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import socket
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import ssl
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from oslo.config import cfg
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from nova import context
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from nova import db
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from nova.openstack.common.gettextutils import _
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from nova.openstack.common import jsonutils
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from nova.openstack.common import log as logging
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from nova.openstack.common import timeutils
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from nova.scheduler import filters
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LOG = logging.getLogger(__name__)
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trusted_opts = [
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cfg.StrOpt('attestation_server',
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help='Attestation server HTTP'),
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cfg.StrOpt('attestation_server_ca_file',
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help='Attestation server Cert file for Identity verification'),
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cfg.StrOpt('attestation_port',
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default='8443',
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help='Attestation server port'),
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cfg.StrOpt('attestation_api_url',
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default='/OpenAttestationWebServices/V1.0',
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help='Attestation web API URL'),
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cfg.StrOpt('attestation_auth_blob',
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help='Attestation authorization blob - must change'),
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cfg.IntOpt('attestation_auth_timeout',
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default=60,
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help='Attestation status cache valid period length'),
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]
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CONF = cfg.CONF
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trust_group = cfg.OptGroup(name='trusted_computing', title='Trust parameters')
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CONF.register_group(trust_group)
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CONF.register_opts(trusted_opts, group=trust_group)
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class HTTPSClientAuthConnection(httplib.HTTPSConnection):
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"""Class to make a HTTPS connection, with support for full client-based
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SSL Authentication
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"""
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def __init__(self, host, port, key_file, cert_file, ca_file, timeout=None):
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httplib.HTTPSConnection.__init__(self, host,
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key_file=key_file,
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cert_file=cert_file)
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self.host = host
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self.port = port
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self.key_file = key_file
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self.cert_file = cert_file
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self.ca_file = ca_file
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self.timeout = timeout
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def connect(self):
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"""Connect to a host on a given (SSL) port.
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If ca_file is pointing somewhere, use it to check Server Certificate.
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Redefined/copied and extended from httplib.py:1105 (Python 2.6.x).
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This is needed to pass cert_reqs=ssl.CERT_REQUIRED as parameter to
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ssl.wrap_socket(), which forces SSL to check server certificate
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against our client certificate.
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"""
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sock = socket.create_connection((self.host, self.port), self.timeout)
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self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file,
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ca_certs=self.ca_file,
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cert_reqs=ssl.CERT_REQUIRED)
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class AttestationService(object):
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# Provide access wrapper to attestation server to get integrity report.
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def __init__(self):
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self.api_url = CONF.trusted_computing.attestation_api_url
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self.host = CONF.trusted_computing.attestation_server
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self.port = CONF.trusted_computing.attestation_port
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self.auth_blob = CONF.trusted_computing.attestation_auth_blob
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self.key_file = None
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self.cert_file = None
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self.ca_file = CONF.trusted_computing.attestation_server_ca_file
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self.request_count = 100
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def _do_request(self, method, action_url, body, headers):
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# Connects to the server and issues a request.
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# :returns: result data
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# :raises: IOError if the request fails
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action_url = "%s/%s" % (self.api_url, action_url)
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try:
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c = HTTPSClientAuthConnection(self.host, self.port,
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key_file=self.key_file,
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cert_file=self.cert_file,
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ca_file=self.ca_file)
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c.request(method, action_url, body, headers)
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res = c.getresponse()
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status_code = res.status
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if status_code in (httplib.OK,
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httplib.CREATED,
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httplib.ACCEPTED,
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httplib.NO_CONTENT):
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return httplib.OK, res
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return status_code, None
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except (socket.error, IOError):
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return IOError, None
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def _request(self, cmd, subcmd, hosts):
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body = {}
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body['count'] = len(hosts)
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body['hosts'] = hosts
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cooked = jsonutils.dumps(body)
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headers = {}
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headers['content-type'] = 'application/json'
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headers['Accept'] = 'application/json'
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if self.auth_blob:
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headers['x-auth-blob'] = self.auth_blob
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status, res = self._do_request(cmd, subcmd, cooked, headers)
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if status == httplib.OK:
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data = res.read()
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return status, jsonutils.loads(data)
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else:
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return status, None
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def do_attestation(self, hosts):
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"""Attests compute nodes through OAT service.
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:param hosts: hosts list to be attested
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:returns: dictionary for trust level and validate time
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"""
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result = None
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status, data = self._request("POST", "PollHosts", hosts)
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if data != None:
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result = data.get('hosts')
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return result
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class ComputeAttestationCache(object):
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"""Cache for compute node attestation
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Cache compute node's trust level for sometime,
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if the cache is out of date, poll OAT service to flush the
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cache.
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OAT service may have cache also. OAT service's cache valid time
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should be set shorter than trusted filter's cache valid time.
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"""
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def __init__(self):
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self.attestservice = AttestationService()
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self.compute_nodes = {}
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admin = context.get_admin_context()
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# Fetch compute node list to initialize the compute_nodes,
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# so that we don't need poll OAT service one by one for each
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# host in the first round that scheduler invokes us.
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computes = db.compute_node_get_all(admin)
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for compute in computes:
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service = compute['service']
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if not service:
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LOG.warn(_("No service for compute ID %s") % compute['id'])
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continue
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host = service['host']
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self._init_cache_entry(host)
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def _cache_valid(self, host):
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cachevalid = False
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if host in self.compute_nodes:
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node_stats = self.compute_nodes.get(host)
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if not timeutils.is_older_than(
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node_stats['vtime'],
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CONF.trusted_computing.attestation_auth_timeout):
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cachevalid = True
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return cachevalid
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def _init_cache_entry(self, host):
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self.compute_nodes[host] = {
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'trust_lvl': 'unknown',
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'vtime': timeutils.normalize_time(
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timeutils.parse_isotime("1970-01-01T00:00:00Z"))}
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def _invalidate_caches(self):
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for host in self.compute_nodes:
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self._init_cache_entry(host)
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def _update_cache_entry(self, state):
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entry = {}
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host = state['host_name']
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entry['trust_lvl'] = state['trust_lvl']
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try:
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# Normalize as naive object to interoperate with utcnow().
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entry['vtime'] = timeutils.normalize_time(
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timeutils.parse_isotime(state['vtime']))
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except ValueError:
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# Mark the system as un-trusted if get invalid vtime.
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entry['trust_lvl'] = 'unknown'
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entry['vtime'] = timeutils.utcnow()
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self.compute_nodes[host] = entry
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def _update_cache(self):
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self._invalidate_caches()
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states = self.attestservice.do_attestation(self.compute_nodes.keys())
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if states is None:
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return
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for state in states:
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self._update_cache_entry(state)
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def get_host_attestation(self, host):
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"""Check host's trust level."""
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if host not in self.compute_nodes:
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self._init_cache_entry(host)
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if not self._cache_valid(host):
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self._update_cache()
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level = self.compute_nodes.get(host).get('trust_lvl')
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return level
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class ComputeAttestation(object):
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def __init__(self):
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self.caches = ComputeAttestationCache()
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def is_trusted(self, host, trust):
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level = self.caches.get_host_attestation(host)
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return trust == level
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class TrustedFilter(filters.BaseHostFilter):
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"""Trusted filter to support Trusted Compute Pools."""
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def __init__(self):
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self.compute_attestation = ComputeAttestation()
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def host_passes(self, host_state, filter_properties):
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instance = filter_properties.get('instance_type', {})
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extra = instance.get('extra_specs', {})
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trust = extra.get('trust:trusted_host')
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host = host_state.host
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if trust:
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return self.compute_attestation.is_trusted(host, trust)
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return True
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