178 lines
6.5 KiB
Python
178 lines
6.5 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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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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# PORTIONS OF THIS FILE ARE FROM:
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# http://code.google.com/p/boto
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# Copyright (c) 2006-2009 Mitch Garnaat http://garnaat.org/
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#
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# Permission is hereby granted, free of charge, to any person obtaining a
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# copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish, dis-
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# tribute, sublicense, and/or sell copies of the Software, and to permit
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# persons to whom the Software is furnished to do so, subject to the fol-
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# lowing conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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# IN THE SOFTWARE.
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"""
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Utility class for parsing signed AMI manifests.
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"""
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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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try:
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# NOTE(vish): for new boto
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import boto
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# for boto.utils
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import boto.provider
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# NOTE(vish): for old boto
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import boto.utils
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except ImportError:
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boto = None
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from nova import exception
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from nova import log as logging
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LOG = logging.getLogger(__name__)
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class Signer(object):
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"""Hacked up code from boto/connection.py"""
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def __init__(self, secret_key):
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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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else:
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self.hmac_256 = None
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def s3_authorization(self, headers, verb, path):
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"""Generate S3 authorization string."""
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if not boto:
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raise exception.NovaException('boto is not installed')
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c_string = boto.utils.canonical_string(verb, path, headers)
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hmac_copy = self.hmac.copy()
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hmac_copy.update(c_string)
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b64_hmac = base64.encodestring(hmac_copy.digest()).strip()
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return b64_hmac
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def generate(self, params, verb, server_string, path):
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"""Generate auth string according to what SignatureVersion is given.
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The signature method must be SHA1 or SHA256.
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"""
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if params['SignatureVersion'] == '0':
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return self._calc_signature_0(params)
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if params['SignatureVersion'] == '1':
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return self._calc_signature_1(params)
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if params['SignatureVersion'] == '2':
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return self._calc_signature_2(params, verb, server_string, path)
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raise exception.NovaException('Unknown Signature Version: %s' %
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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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keys = params.keys()
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keys.sort(cmp=lambda x, y: cmp(x.lower(), y.lower()))
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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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pairs.append(key + '=' + urllib.quote(val))
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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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pairs = []
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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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pairs.append(key + '=' + urllib.quote(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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LOG.debug('using _calc_signature_2')
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string_to_sign = '%s\n%s\n%s\n' % (verb, server_string, path)
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if 'SignatureMethod' not in params:
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raise exception.NovaException('No SignatureMethod specified')
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if params['SignatureMethod'] == 'HmacSHA256':
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if not self.hmac_256:
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msg = _('SHA256 not supported on this server')
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raise exception.NovaException(msg)
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current_hmac = self.hmac_256
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elif params['SignatureMethod'] == 'HmacSHA1':
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current_hmac = self.hmac
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else:
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raise exception.NovaException('SignatureMethod %s not supported'
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% params['SignatureMethod'])
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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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LOG.debug('query string: %s', qs)
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string_to_sign += qs
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LOG.debug('string_to_sign: %s', string_to_sign)
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current_hmac.update(string_to_sign)
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b64 = base64.b64encode(current_hmac.digest())
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LOG.debug('len(b64)=%d', len(b64))
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LOG.debug('base64 encoded digest: %s', b64)
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return b64
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if __name__ == '__main__':
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print Signer('foo').generate({'SignatureVersion': '2',
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'SignatureMethod': 'HmacSHA256'},
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'get', 'server', '/foo')
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