1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
# 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
import requests
import webob.dec
import webob.exc
from keystonemiddleware.openstack.common import jsonutils
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)
|
