106 lines
4.2 KiB
Python
106 lines
4.2 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
|
|
# Copyright 2012 OpenStack LLC
|
|
# Copyright 2010 United States Government as represented by the
|
|
# Administrator of the National Aeronautics and Space Administration.
|
|
# Copyright 2011 - 2012 Justin Santa Barbara
|
|
# 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.
|
|
|
|
import base64
|
|
import hashlib
|
|
import hmac
|
|
import urllib
|
|
|
|
# FIXME : This should be imported from keystoneclient, so this can be removed
|
|
# when we no longer require an internal fallback implementation
|
|
# see : https://review.openstack.org/#/c/16964/
|
|
# https://blueprints.launchpad.net/keystone/+spec/ec2signer-to-keystoneclient
|
|
|
|
|
|
class Ec2Signer(object):
|
|
"""
|
|
Utility class which adds allows a request to be signed with an AWS style
|
|
signature, which can then be used for authentication via the keystone ec2
|
|
authentication extension
|
|
"""
|
|
|
|
def __init__(self, secret_key):
|
|
secret_key = secret_key.encode()
|
|
self.hmac = hmac.new(secret_key, digestmod=hashlib.sha1)
|
|
if hashlib.sha256:
|
|
self.hmac_256 = hmac.new(secret_key, digestmod=hashlib.sha256)
|
|
|
|
def generate(self, credentials):
|
|
"""Generate auth string according to what SignatureVersion is given."""
|
|
if credentials['params']['SignatureVersion'] == '0':
|
|
return self._calc_signature_0(credentials['params'])
|
|
if credentials['params']['SignatureVersion'] == '1':
|
|
return self._calc_signature_1(credentials['params'])
|
|
if credentials['params']['SignatureVersion'] == '2':
|
|
return self._calc_signature_2(credentials['params'],
|
|
credentials['verb'],
|
|
credentials['host'],
|
|
credentials['path'])
|
|
raise Exception('Unknown Signature Version: %s' %
|
|
credentials['params']['SignatureVersion'])
|
|
|
|
@staticmethod
|
|
def _get_utf8_value(value):
|
|
"""Get the UTF8-encoded version of a value."""
|
|
if not isinstance(value, str) and not isinstance(value, unicode):
|
|
value = str(value)
|
|
if isinstance(value, unicode):
|
|
return value.encode('utf-8')
|
|
else:
|
|
return value
|
|
|
|
def _calc_signature_0(self, params):
|
|
"""Generate AWS signature version 0 string."""
|
|
s = params['Action'] + params['Timestamp']
|
|
self.hmac.update(s)
|
|
return base64.b64encode(self.hmac.digest())
|
|
|
|
def _calc_signature_1(self, params):
|
|
"""Generate AWS signature version 1 string."""
|
|
keys = params.keys()
|
|
keys.sort(cmp=lambda x, y: cmp(x.lower(), y.lower()))
|
|
for key in keys:
|
|
self.hmac.update(key)
|
|
val = self._get_utf8_value(params[key])
|
|
self.hmac.update(val)
|
|
return base64.b64encode(self.hmac.digest())
|
|
|
|
def _calc_signature_2(self, params, verb, server_string, path):
|
|
"""Generate AWS signature version 2 string."""
|
|
string_to_sign = '%s\n%s\n%s\n' % (verb, server_string, path)
|
|
if self.hmac_256:
|
|
current_hmac = self.hmac_256
|
|
params['SignatureMethod'] = 'HmacSHA256'
|
|
else:
|
|
current_hmac = self.hmac
|
|
params['SignatureMethod'] = 'HmacSHA1'
|
|
keys = params.keys()
|
|
keys.sort()
|
|
pairs = []
|
|
for key in keys:
|
|
val = self._get_utf8_value(params[key])
|
|
val = urllib.quote(val, safe='-_~')
|
|
pairs.append(urllib.quote(key, safe='') + '=' + val)
|
|
qs = '&'.join(pairs)
|
|
string_to_sign += qs
|
|
current_hmac.update(string_to_sign)
|
|
b64 = base64.b64encode(current_hmac.digest())
|
|
return b64
|