107 lines
3.7 KiB
Python
107 lines
3.7 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2012 OpenStack LLC
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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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# 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 urlparse import urlparse
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from eventlet.green import httplib
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import webob.dec
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import webob.exc
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from nova import flags
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from nova import utils
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from nova import wsgi
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FLAGS = flags.FLAGS
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flags.DEFINE_string('keystone_ec2_url',
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'http://localhost:5000/v2.0/ec2tokens',
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'URL to get token from ec2 request.')
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class EC2Token(wsgi.Middleware):
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"""Authenticate an EC2 request with keystone and convert to token."""
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@webob.dec.wsgify(RequestClass=wsgi.Request)
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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 = {'ec2Credentials': {'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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creds_json = utils.dumps(creds)
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headers = {'Content-Type': 'application/json'}
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# Disable 'has no x member' pylint error
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# for httplib and urlparse
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# pylint: disable-msg=E1101
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o = urlparse(FLAGS.keystone_ec2_url)
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if o.scheme == 'http':
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conn = httplib.HTTPConnection(o.netloc)
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else:
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conn = httplib.HTTPSConnection(o.netloc)
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conn.request('POST', o.path, body=creds_json, headers=headers)
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response = conn.getresponse().read()
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conn.close()
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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 = utils.loads(response)
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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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