8ce98ba6a2
Currently, the Cisco VPN drivers use two routers for the proof of concept
solution. A Neutron router provides access to the public and private
subnets, and a Cisco CSR (out-of-band) provides the VPN tunneling.
The end goal is to integrate the Cisco VPN drivers with the Cisco L3
routing plugin being developed (as a separate blueprint), allowing an
in-band CSR to be used as a Neutron router for VPN functionality.
This commit provides an incremental approach to that goal, by modifying
the Cisco VPN drivers to be able to dynamically obtain CSR info from
an INI file, instead of statically reading the INI file at start-up.
A CSR VM can be created out-of-band (or in-band using Nova) and the INI
file can be updated with the router info. Then, the Cisco VPN driver
can use that information (dynamically) to create IPSec connections.
Once the Cisco L3 router plugin is available, the INI file will be
removed, and two calls to the plugin will be used to obtain the needed
router information, for an integrated solution.
The main advantages are:
- Dynamically use the CSR for VPN.
- Less manual intervention and setup.
- Easy migration to final solution.
- No dependency on the Cisco L3 router plugin implementation.
Note 1: The INI unit tests are moved from device driver to service
driver and modified.
Note 2: I added a unit test for deleting IPSec site-to-site connection,
which was missing (pass).
Note 3: For more details on the change, you can view this Google Doc:
http://goo.gl/DXir8c
Change-Id: I307fc79952e3e12a0f77679ac1fc2b314fa63684
Partially-Implements: blueprint cisco-vpnaas-with-cisco-csr-router
283 lines
12 KiB
Python
283 lines
12 KiB
Python
# Copyright 2014 Cisco Systems, Inc. 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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# @author: Paul Michali, Cisco Systems, Inc.
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import time
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import netaddr
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import requests
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from requests import exceptions as r_exc
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from neutron.openstack.common import jsonutils
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from neutron.openstack.common import log as logging
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TIMEOUT = 20.0
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LOG = logging.getLogger(__name__)
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HEADER_CONTENT_TYPE_JSON = {'content-type': 'application/json'}
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URL_BASE = 'https://%(host)s/api/v1/%(resource)s'
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# CSR RESTapi URIs
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URI_VPN_IPSEC_POLICIES = 'vpn-svc/ipsec/policies'
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URI_VPN_IPSEC_POLICIES_ID = URI_VPN_IPSEC_POLICIES + '/%s'
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URI_VPN_IKE_POLICIES = 'vpn-svc/ike/policies'
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URI_VPN_IKE_POLICIES_ID = URI_VPN_IKE_POLICIES + '/%s'
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URI_VPN_IKE_KEYRINGS = 'vpn-svc/ike/keyrings'
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URI_VPN_IKE_KEYRINGS_ID = URI_VPN_IKE_KEYRINGS + '/%s'
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URI_VPN_IKE_KEEPALIVE = 'vpn-svc/ike/keepalive'
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URI_VPN_SITE_TO_SITE = 'vpn-svc/site-to-site'
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URI_VPN_SITE_TO_SITE_ID = URI_VPN_SITE_TO_SITE + '/%s'
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URI_VPN_SITE_TO_SITE_STATE = URI_VPN_SITE_TO_SITE + '/%s/state'
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URI_VPN_SITE_ACTIVE_SESSIONS = URI_VPN_SITE_TO_SITE + '/active/sessions'
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URI_ROUTING_STATIC_ROUTES = 'routing-svc/static-routes'
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URI_ROUTING_STATIC_ROUTES_ID = URI_ROUTING_STATIC_ROUTES + '/%s'
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def make_route_id(cidr, interface):
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"""Build ID that will be used to identify route for later deletion."""
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net = netaddr.IPNetwork(cidr)
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return '%(network)s_%(prefix)s_%(interface)s' % {
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'network': net.network,
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'prefix': net.prefixlen,
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'interface': interface}
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class CsrRestClient(object):
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"""REST CsrRestClient for accessing the Cisco Cloud Services Router."""
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def __init__(self, settings):
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self.port = str(settings.get('protocol_port', 55443))
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self.host = ':'.join([settings.get('rest_mgmt_ip', ''), self.port])
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self.tunnel_ip = settings.get('external_ip', '')
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self.auth = (settings['username'], settings['password'])
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self.tunnel_if_name = settings.get('tunnel_if_name', '')
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self.token = None
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self.status = requests.codes.OK
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self.timeout = settings.get('timeout')
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self.max_tries = 5
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self.session = requests.Session()
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def _response_info_for(self, response, method):
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"""Return contents or location from response.
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For a POST or GET with a 200 response, the response content
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is returned.
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For a POST with a 201 response, return the header's location,
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which contains the identifier for the created resource.
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If there is an error, return the response content, so that
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it can be used in error processing ('error-code', 'error-message',
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and 'detail' fields).
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"""
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if method in ('POST', 'GET') and self.status == requests.codes.OK:
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LOG.debug(_('RESPONSE: %s'), response.json())
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return response.json()
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if method == 'POST' and self.status == requests.codes.CREATED:
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return response.headers.get('location', '')
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if self.status >= requests.codes.BAD_REQUEST and response.content:
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if 'error-code' in response.content:
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content = jsonutils.loads(response.content)
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LOG.debug("Error response content %s", content)
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return content
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def _request(self, method, url, **kwargs):
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"""Perform REST request and save response info."""
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try:
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LOG.debug(_("%(method)s: Request for %(resource)s payload: "
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"%(payload)s"),
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{'method': method.upper(), 'resource': url,
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'payload': kwargs.get('data')})
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start_time = time.time()
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response = self.session.request(method, url, verify=False,
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timeout=self.timeout, **kwargs)
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LOG.debug(_("%(method)s Took %(time).2f seconds to process"),
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{'method': method.upper(),
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'time': time.time() - start_time})
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except (r_exc.Timeout, r_exc.SSLError) as te:
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# Should never see SSLError, unless requests package is old (<2.0)
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timeout_val = 0.0 if self.timeout is None else self.timeout
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LOG.warning(_("%(method)s: Request timeout%(ssl)s "
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"(%(timeout).3f sec) for CSR(%(host)s)"),
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{'method': method,
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'timeout': timeout_val,
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'ssl': '(SSLError)'
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if isinstance(te, r_exc.SSLError) else '',
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'host': self.host})
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self.status = requests.codes.REQUEST_TIMEOUT
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except r_exc.ConnectionError:
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LOG.exception(_("%(method)s: Unable to connect to CSR(%(host)s)"),
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{'method': method, 'host': self.host})
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self.status = requests.codes.NOT_FOUND
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except Exception as e:
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LOG.error(_("%(method)s: Unexpected error for CSR (%(host)s): "
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"%(error)s"),
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{'method': method, 'host': self.host, 'error': e})
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self.status = requests.codes.INTERNAL_SERVER_ERROR
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else:
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self.status = response.status_code
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LOG.debug(_("%(method)s: Completed [%(status)s]"),
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{'method': method, 'status': self.status})
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return self._response_info_for(response, method)
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def authenticate(self):
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"""Obtain a token to use for subsequent CSR REST requests.
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This is called when there is no token yet, or if the token has expired
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and attempts to use it resulted in an UNAUTHORIZED REST response.
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"""
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url = URL_BASE % {'host': self.host, 'resource': 'auth/token-services'}
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headers = {'Content-Length': '0',
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'Accept': 'application/json'}
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headers.update(HEADER_CONTENT_TYPE_JSON)
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LOG.debug(_("%(auth)s with CSR %(host)s"),
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{'auth': 'Authenticating' if self.token is None
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else 'Reauthenticating', 'host': self.host})
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self.token = None
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response = self._request("POST", url, headers=headers, auth=self.auth)
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if response:
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self.token = response['token-id']
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LOG.debug(_("Successfully authenticated with CSR %s"), self.host)
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return True
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LOG.error(_("Failed authentication with CSR %(host)s [%(status)s]"),
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{'host': self.host, 'status': self.status})
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def _do_request(self, method, resource, payload=None, more_headers=None,
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full_url=False):
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"""Perform a REST request to a CSR resource.
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If this is the first time interacting with the CSR, a token will
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be obtained. If the request fails, due to an expired token, the
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token will be obtained and the request will be retried once more.
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"""
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if self.token is None:
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if not self.authenticate():
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return
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if full_url:
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url = resource
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else:
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url = ('https://%(host)s/api/v1/%(resource)s' %
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{'host': self.host, 'resource': resource})
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headers = {'Accept': 'application/json', 'X-auth-token': self.token}
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if more_headers:
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headers.update(more_headers)
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if payload:
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payload = jsonutils.dumps(payload)
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response = self._request(method, url, data=payload, headers=headers)
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if self.status == requests.codes.UNAUTHORIZED:
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if not self.authenticate():
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return
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headers['X-auth-token'] = self.token
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response = self._request(method, url, data=payload,
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headers=headers)
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if self.status != requests.codes.REQUEST_TIMEOUT:
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return response
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LOG.error(_("%(method)s: Request timeout for CSR(%(host)s)"),
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{'method': method, 'host': self.host})
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def get_request(self, resource, full_url=False):
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"""Perform a REST GET requests for a CSR resource."""
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return self._do_request('GET', resource, full_url=full_url)
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def post_request(self, resource, payload=None):
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"""Perform a POST request to a CSR resource."""
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return self._do_request('POST', resource, payload=payload,
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more_headers=HEADER_CONTENT_TYPE_JSON)
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def put_request(self, resource, payload=None):
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"""Perform a PUT request to a CSR resource."""
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return self._do_request('PUT', resource, payload=payload,
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more_headers=HEADER_CONTENT_TYPE_JSON)
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def delete_request(self, resource):
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"""Perform a DELETE request on a CSR resource."""
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return self._do_request('DELETE', resource,
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more_headers=HEADER_CONTENT_TYPE_JSON)
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def create_ike_policy(self, policy_info):
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base_ike_policy_info = {u'version': u'v1',
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u'local-auth-method': u'pre-share'}
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base_ike_policy_info.update(policy_info)
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return self.post_request(URI_VPN_IKE_POLICIES,
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payload=base_ike_policy_info)
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def create_ipsec_policy(self, policy_info):
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base_ipsec_policy_info = {u'mode': u'tunnel'}
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base_ipsec_policy_info.update(policy_info)
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return self.post_request(URI_VPN_IPSEC_POLICIES,
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payload=base_ipsec_policy_info)
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def create_pre_shared_key(self, psk_info):
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return self.post_request(URI_VPN_IKE_KEYRINGS, payload=psk_info)
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def create_ipsec_connection(self, connection_info):
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base_conn_info = {
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u'vpn-type': u'site-to-site',
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u'ip-version': u'ipv4',
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u'local-device': {
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u'tunnel-ip-address': self.tunnel_ip,
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u'ip-address': self.tunnel_if_name
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}
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}
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connection_info.update(base_conn_info)
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return self.post_request(URI_VPN_SITE_TO_SITE,
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payload=connection_info)
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def configure_ike_keepalive(self, keepalive_info):
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base_keepalive_info = {u'periodic': True}
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keepalive_info.update(base_keepalive_info)
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return self.put_request(URI_VPN_IKE_KEEPALIVE, keepalive_info)
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def create_static_route(self, route_info):
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return self.post_request(URI_ROUTING_STATIC_ROUTES,
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payload=route_info)
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def delete_static_route(self, route_id):
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return self.delete_request(URI_ROUTING_STATIC_ROUTES_ID % route_id)
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def set_ipsec_connection_state(self, tunnel, admin_up=True):
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"""Set the IPSec site-to-site connection (tunnel) admin state.
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Note: When a tunnel is created, it will be admin up.
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"""
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info = {u'vpn-interface-name': tunnel, u'enabled': admin_up}
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return self.put_request(URI_VPN_SITE_TO_SITE_STATE % tunnel, info)
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def delete_ipsec_connection(self, conn_id):
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return self.delete_request(URI_VPN_SITE_TO_SITE_ID % conn_id)
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def delete_ipsec_policy(self, policy_id):
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return self.delete_request(URI_VPN_IPSEC_POLICIES_ID % policy_id)
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def delete_ike_policy(self, policy_id):
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return self.delete_request(URI_VPN_IKE_POLICIES_ID % policy_id)
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def delete_pre_shared_key(self, key_id):
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return self.delete_request(URI_VPN_IKE_KEYRINGS_ID % key_id)
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def read_tunnel_statuses(self):
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results = self.get_request(URI_VPN_SITE_ACTIVE_SESSIONS)
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if self.status != requests.codes.OK or not results:
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return []
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tunnels = [(t[u'vpn-interface-name'], t[u'status'])
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for t in results['items']]
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return tunnels
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