2a207f2eb1
Add Ec2Signer class (from keystone.utils) to keystoneclient Allows clients to more easily generate correctly signed requests for use with APIs using EC2 auth-extension based authentication blueprint ec2signer-to-keystoneclient Signed-off-by: Steven Hardy <shardy@redhat.com> Change-Id: Iea69ccd4dadd09740f42d907bf14f61c1750596a
101 lines
3.9 KiB
Python
101 lines
3.9 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2012 OpenStack LLC
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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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# Copyright 2011 - 2012 Justin Santa Barbara
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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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import base64
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import hashlib
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import hmac
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import urllib
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class Ec2Signer(object):
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"""
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Utility class which adds allows a request to be signed with an AWS style
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signature, which can then be used for authentication via the keystone ec2
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authentication extension
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"""
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def __init__(self, secret_key):
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secret_key = secret_key.encode()
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self.hmac = hmac.new(secret_key, digestmod=hashlib.sha1)
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if hashlib.sha256:
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self.hmac_256 = hmac.new(secret_key, digestmod=hashlib.sha256)
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def generate(self, credentials):
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"""Generate auth string according to what SignatureVersion is given."""
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if credentials['params']['SignatureVersion'] == '0':
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return self._calc_signature_0(credentials['params'])
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if credentials['params']['SignatureVersion'] == '1':
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return self._calc_signature_1(credentials['params'])
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if credentials['params']['SignatureVersion'] == '2':
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return self._calc_signature_2(credentials['params'],
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credentials['verb'],
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credentials['host'],
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credentials['path'])
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raise Exception('Unknown Signature Version: %s' %
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credentials['params']['SignatureVersion'])
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@staticmethod
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def _get_utf8_value(value):
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"""Get the UTF8-encoded version of a value."""
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if not isinstance(value, str) and not isinstance(value, unicode):
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value = str(value)
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if isinstance(value, unicode):
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return value.encode('utf-8')
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else:
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return value
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def _calc_signature_0(self, params):
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"""Generate AWS signature version 0 string."""
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s = params['Action'] + params['Timestamp']
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self.hmac.update(s)
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return base64.b64encode(self.hmac.digest())
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def _calc_signature_1(self, params):
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"""Generate AWS signature version 1 string."""
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keys = params.keys()
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keys.sort(cmp=lambda x, y: cmp(x.lower(), y.lower()))
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for key in keys:
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self.hmac.update(key)
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val = self._get_utf8_value(params[key])
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self.hmac.update(val)
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return base64.b64encode(self.hmac.digest())
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def _calc_signature_2(self, params, verb, server_string, path):
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"""Generate AWS signature version 2 string."""
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string_to_sign = '%s\n%s\n%s\n' % (verb, server_string, path)
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if self.hmac_256:
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current_hmac = self.hmac_256
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params['SignatureMethod'] = 'HmacSHA256'
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else:
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current_hmac = self.hmac
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params['SignatureMethod'] = 'HmacSHA1'
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keys = params.keys()
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keys.sort()
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pairs = []
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for key in keys:
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val = self._get_utf8_value(params[key])
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val = urllib.quote(val, safe='-_~')
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pairs.append(urllib.quote(key, safe='') + '=' + val)
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qs = '&'.join(pairs)
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string_to_sign += qs
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current_hmac.update(string_to_sign)
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b64 = base64.b64encode(current_hmac.digest())
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return b64
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