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# Copyright 2012 OpenStack Foundation
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
Starting point for routing EC2 requests.
"""
from oslo_config import cfg
from oslo_serialization import jsonutils
import requests
import webob.dec
import webob.exc
keystone_ec2_opts = [
cfg.StrOpt('url',
default='http://localhost:5000/v2.0/ec2tokens',
help='URL to get token from ec2 request.'),
cfg.StrOpt('keyfile',
help='Required if EC2 server requires client certificate.'),
cfg.StrOpt('certfile',
help='Client certificate key filename. Required if EC2 server '
'requires client certificate.'),
cfg.StrOpt('cafile',
help='A PEM encoded certificate authority to use when '
'verifying HTTPS connections. Defaults to the system '
'CAs.'),
cfg.BoolOpt('insecure', default=False,
help='Disable SSL certificate verification.'),
]
CONF = cfg.CONF
CONF.register_opts(keystone_ec2_opts, group='keystone_ec2_token')
class EC2Token(object):
"""Authenticate an EC2 request with keystone and convert to token."""
def __init__(self, application):
super(EC2Token, self).__init__()
self._application = application
@webob.dec.wsgify()
def __call__(self, req):
# Read request signature and access id.
try:
signature = req.params['Signature']
access = req.params['AWSAccessKeyId']
except KeyError:
raise webob.exc.HTTPBadRequest()
# Make a copy of args for authentication and signature verification.
auth_params = dict(req.params)
# Not part of authentication args
auth_params.pop('Signature')
# Authenticate the request.
creds = {
'ec2Credentials': {
'access': access,
'signature': signature,
'host': req.host,
'verb': req.method,
'path': req.path,
'params': auth_params,
}
}
creds_json = jsonutils.dumps(creds)
headers = {'Content-Type': 'application/json'}
verify = True
if CONF.keystone_ec2_token.insecure:
verify = False
elif CONF.keystone_ec2_token.cafile:
verify = CONF.keystone_ec2_token.cafile
cert = None
if (CONF.keystone_ec2_token.certfile and
CONF.keystone_ec2_token.keyfile):
cert = (CONF.keystone_ec2_certfile,
CONF.keystone_ec2_token.keyfile)
elif CONF.keystone_ec2_token.certfile:
cert = CONF.keystone_ec2_token.certfile
response = requests.post(CONF.keystone_ec2_token.url, data=creds_json,
headers=headers, verify=verify, cert=cert)
# NOTE(vish): We could save a call to keystone by
# having keystone return token, tenant,
# user, and roles from this call.
result = response.json()
try:
token_id = result['access']['token']['id']
except (AttributeError, KeyError):
raise webob.exc.HTTPBadRequest()
# Authenticated!
req.headers['X-Auth-Token'] = token_id
return self._application
def filter_factory(global_conf, **local_conf):
"""Returns a WSGI filter app for use with paste.deploy."""
conf = global_conf.copy()
conf.update(local_conf)
def auth_filter(app):
return EC2Token(app, conf)
return auth_filter
def app_factory(global_conf, **local_conf):
conf = global_conf.copy()
conf.update(local_conf)
return EC2Token(None, conf)
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