244 lines
8.1 KiB
Python
244 lines
8.1 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 json
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import subprocess
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import sys
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import time
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import urllib
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import passlib.hash
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from keystone import config
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from keystone.common import logging
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CONF = config.CONF
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config.register_int('crypt_strength', default=40000)
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ISO_TIME_FORMAT = '%Y-%m-%dT%H:%M:%SZ'
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def import_class(import_str):
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"""Returns a class from a string including module and class."""
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mod_str, _sep, class_str = import_str.rpartition('.')
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try:
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__import__(mod_str)
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return getattr(sys.modules[mod_str], class_str)
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except (ImportError, ValueError, AttributeError), exc:
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logging.debug('Inner Exception: %s', exc)
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raise
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def import_object(import_str, *args, **kw):
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"""Returns an object including a module or module and class."""
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try:
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__import__(import_str)
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return sys.modules[import_str]
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except ImportError:
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cls = import_class(import_str)
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return cls(*args, **kw)
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class SmarterEncoder(json.JSONEncoder):
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"""Help for JSON encoding dict-like objects."""
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def default(self, obj):
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if not isinstance(obj, dict) and hasattr(obj, 'iteritems'):
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return dict(obj.iteritems())
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return super(SmarterEncoder, self).default(obj)
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class Ec2Signer(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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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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logging.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 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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logging.debug('query string: %s', qs)
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string_to_sign += qs
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logging.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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logging.debug('len(b64)=%d', len(b64))
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logging.debug('base64 encoded digest: %s', b64)
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return b64
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def hash_password(password):
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"""Hash a password. Hard."""
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password_utf8 = password.encode('utf-8')
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if passlib.hash.sha512_crypt.identify(password_utf8):
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return password_utf8
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h = passlib.hash.sha512_crypt.encrypt(password_utf8,
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rounds=CONF.crypt_strength)
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return h
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def ldap_hash_password(password):
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"""Hash a password. Hard."""
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password_utf8 = password.encode('utf-8')
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h = passlib.hash.ldap_salted_sha1.encrypt(password_utf8)
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return h
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def ldap_check_password(password, hashed):
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if password is None:
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return False
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password_utf8 = password.encode('utf-8')
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h = passlib.hash.ldap_salted_sha1.encrypt(password_utf8)
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return passlib.hash.ldap_salted_sha1.verify(password_utf8, hashed)
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def check_password(password, hashed):
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"""Check that a plaintext password matches hashed.
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hashpw returns the salt value concatenated with the actual hash value.
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It extracts the actual salt if this value is then passed as the salt.
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"""
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if password is None:
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return False
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password_utf8 = password.encode('utf-8')
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return passlib.hash.sha512_crypt.verify(password_utf8, hashed)
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# From python 2.7
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def check_output(*popenargs, **kwargs):
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r"""Run command with arguments and return its output as a byte string.
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If the exit code was non-zero it raises a CalledProcessError. The
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CalledProcessError object will have the return code in the returncode
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attribute and output in the output attribute.
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The arguments are the same as for the Popen constructor. Example:
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>>> check_output(['ls', '-l', '/dev/null'])
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'crw-rw-rw- 1 root root 1, 3 Oct 18 2007 /dev/null\n'
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The stdout argument is not allowed as it is used internally.
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To capture standard error in the result, use stderr=STDOUT.
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>>> check_output(['/bin/sh', '-c',
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... 'ls -l non_existent_file ; exit 0'],
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... stderr=STDOUT)
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'ls: non_existent_file: No such file or directory\n'
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"""
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if 'stdout' in kwargs:
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raise ValueError('stdout argument not allowed, it will be overridden.')
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logging.debug(' '.join(popenargs[0]))
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process = subprocess.Popen(stdout=subprocess.PIPE, *popenargs, **kwargs)
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output, unused_err = process.communicate()
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retcode = process.poll()
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if retcode:
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cmd = kwargs.get('args')
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if cmd is None:
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cmd = popenargs[0]
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raise subprocess.CalledProcessError(retcode, cmd)
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return output
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def git(*args):
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return check_output(['git'] + list(args))
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def isotime(dt_obj):
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"""Format datetime object as ISO compliant string.
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:param dt_obj: datetime.datetime object
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:returns: string representation of datetime object
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"""
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return dt_obj.strftime(ISO_TIME_FORMAT)
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def unixtime(dt_obj):
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"""Format datetime object as unix timestamp
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:param dt_obj: datetime.datetime object
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:returns: float
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"""
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return time.mktime(dt_obj.utctimetuple())
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