131 lines
4.3 KiB
Python
131 lines
4.3 KiB
Python
# Copyright 2012 OpenStack Foundation
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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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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Starting point for routing EC2 requests.
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"""
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from oslo_config import cfg
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from oslo_serialization import jsonutils
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import requests
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import webob.dec
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import webob.exc
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keystone_ec2_opts = [
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cfg.StrOpt('url',
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default='http://localhost:5000/v2.0/ec2tokens',
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help='URL to get token from ec2 request.'),
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cfg.StrOpt('keyfile',
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help='Required if EC2 server requires client certificate.'),
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cfg.StrOpt('certfile',
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help='Client certificate key filename. Required if EC2 server '
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'requires client certificate.'),
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cfg.StrOpt('cafile',
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help='A PEM encoded certificate authority to use when '
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'verifying HTTPS connections. Defaults to the system '
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'CAs.'),
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cfg.BoolOpt('insecure', default=False,
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help='Disable SSL certificate verification.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(keystone_ec2_opts, group='keystone_ec2_token')
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class EC2Token(object):
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"""Authenticate an EC2 request with keystone and convert to token."""
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def __init__(self, application):
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super(EC2Token, self).__init__()
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self._application = application
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@webob.dec.wsgify()
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def __call__(self, req):
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# Read request signature and access id.
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try:
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signature = req.params['Signature']
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access = req.params['AWSAccessKeyId']
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except KeyError:
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raise webob.exc.HTTPBadRequest()
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# Make a copy of args for authentication and signature verification.
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auth_params = dict(req.params)
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# Not part of authentication args
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auth_params.pop('Signature')
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# Authenticate the request.
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creds = {
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'ec2Credentials': {
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'access': access,
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'signature': signature,
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'host': req.host,
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'verb': req.method,
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'path': req.path,
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'params': auth_params,
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}
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}
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creds_json = jsonutils.dumps(creds)
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headers = {'Content-Type': 'application/json'}
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verify = True
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if CONF.keystone_ec2_token.insecure:
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verify = False
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elif CONF.keystone_ec2_token.cafile:
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verify = CONF.keystone_ec2_token.cafile
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cert = None
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if (CONF.keystone_ec2_token.certfile and
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CONF.keystone_ec2_token.keyfile):
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cert = (CONF.keystone_ec2_certfile,
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CONF.keystone_ec2_token.keyfile)
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elif CONF.keystone_ec2_token.certfile:
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cert = CONF.keystone_ec2_token.certfile
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response = requests.post(CONF.keystone_ec2_token.url, data=creds_json,
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headers=headers, verify=verify, cert=cert)
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# NOTE(vish): We could save a call to keystone by
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# having keystone return token, tenant,
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# user, and roles from this call.
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result = response.json()
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try:
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token_id = result['access']['token']['id']
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except (AttributeError, KeyError):
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raise webob.exc.HTTPBadRequest()
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# Authenticated!
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req.headers['X-Auth-Token'] = token_id
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return self._application
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def filter_factory(global_conf, **local_conf):
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"""Returns a WSGI filter app for use with paste.deploy."""
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conf = global_conf.copy()
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conf.update(local_conf)
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def auth_filter(app):
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return EC2Token(app, conf)
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return auth_filter
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def app_factory(global_conf, **local_conf):
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conf = global_conf.copy()
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conf.update(local_conf)
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return EC2Token(None, conf)
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