/usr/lib/python2.7/dist-packages/requestbuilder/auth.py is in python-requestbuilder 0.1.0~beta2-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 | # Copyright (c) 2012-2013, Eucalyptus Systems, Inc.
#
# Permission to use, copy, modify, and/or distribute this software for
# any purpose with or without fee is hereby granted, provided that the
# above copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
from __future__ import absolute_import
import argparse
import base64
import email.utils
import hashlib
import hmac
import os
import logging
import re
from requestbuilder import Arg, AUTH
from requestbuilder.exceptions import AuthError
from requestbuilder.util import add_default_routes, aggregate_subclass_fields
import six
import time
import urllib
import urlparse
ISO8601 = '%Y-%m-%dT%H:%M:%SZ'
class BaseAuth(object):
'''
Basis for all authentication
This class does nothing on its own. It is up to you to implement the
necessary functions to effect an authentication scheme.
'''
ARGS = []
DEFAULT_ROUTES = (AUTH,)
def __init__(self, config, loglevel=None, **kwargs):
self.args = kwargs
self.config = config
# Auth handlers are much more tightly coupled with their associated
# services. Since some of them need to have access to stuff like
# endpoint URLs and region names the service will automatically give
# the auth handler a weak reference to itself when it creates the auth
# handler itself or when you pass it to the service's __init__ method.
# Be aware of this when you set the service's auth attribute by hand --
# you may need to point it at the service for it to function properly.
self.service = None
self.log = logging.getLogger(self.__class__.__name__)
if loglevel is not None:
self.log.level = loglevel
def collect_arg_objs(self):
arg_objs = aggregate_subclass_fields(self.__class__, 'ARGS')
add_default_routes(arg_objs, self.DEFAULT_ROUTES)
return arg_objs
def preprocess_arg_objs(self, arg_objs):
pass
def configure(self):
pass
def __call__(self, req):
pass
class HmacKeyAuth(BaseAuth):
'''
Basis for AWS HMAC-based authentication
'''
ARGS = [Arg('-I', '--access-key-id', dest='key_id', metavar='KEY_ID'),
Arg('-S', '--secret-key', dest='secret_key', metavar='KEY')]
def configure(self):
# If the current user/region was explicitly set (e.g. with --region),
# use that first
self.configure_from_configfile(only_if_explicit=True)
# See if an AWS credential file was given in the environment
self.configure_from_aws_credential_file()
# Try the requestbuilder config file next
self.configure_from_configfile()
if not self.args.get('key_id'):
raise AuthError('missing access key ID; please supply one with -I')
if not self.args.get('secret_key'):
raise AuthError('missing secret key; please supply one with -S')
def configure_from_aws_credential_file(self):
if 'AWS_ACCESS_KEY' in os.environ and not self.args.get('key_id'):
self.args['key_id'] = os.getenv('AWS_ACCESS_KEY')
if 'AWS_SECRET_KEY' in os.environ and not self.args.get('secret_key'):
self.args['secret_key'] = os.getenv('AWS_SECRET_KEY')
if 'AWS_CREDENTIAL_FILE' in os.environ:
path = os.getenv('AWS_CREDENTIAL_FILE')
path = os.path.expandvars(path)
path = os.path.expanduser(path)
with open(path) as credfile:
for line in credfile:
line = line.split('#', 1)[0]
if '=' in line:
(key, val) = line.split('=', 1)
if (key.strip() == 'AWSAccessKeyId' and
not self.args.get('key_id')):
# There's probably a better way to do this, but it
# seems to work for me. Patches are welcome. :)
self.args['key_id'] = val.strip()
elif (key.strip() == 'AWSSecretKey' and
not self.args.get('secret_key')):
# This space for rent
self.args['secret_key'] = val.strip()
def configure_from_configfile(self, only_if_explicit=False):
if (only_if_explicit and self.config.current_user is None and
self.config.current_region is None):
# The current user/region were not explicitly set, so do nothing.
return
if not self.args.get('key_id'):
config_key_id = self.config.get_user_option('key-id')
if config_key_id:
self.args['key_id'] = config_key_id
if not self.args.get('secret_key'):
config_secret_key = self.config.get_user_option('secret-key',
redact=True)
if config_secret_key:
self.args['secret_key'] = config_secret_key
class S3RestAuth(HmacKeyAuth):
'''
S3 REST authentication
http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html
'''
# This list comes from the CanonicalizedResource section of the above page
HASHED_PARAMS = set(('acl', 'lifecycle', 'location', 'logging',
'notification', 'partNumber', 'policy', 'requestPayment',
'torrent', 'uploadId', 'uploads', 'versionId', 'versioning',
'versions', 'website'))
def __call__(self, req):
if req.headers is None:
req.headers = {}
req.headers['Date'] = email.utils.formatdate()
req.headers['Host'] = urlparse.urlparse(req.url).netloc
if 'Signature' in req.headers:
del req.headers['Signature']
c_headers = self.get_canonicalized_headers(req)
self.log.debug('canonicalized_headers: %s', repr(c_headers))
c_resource = self.get_canonicalized_resource(req)
self.log.debug('canonicalized resource: %s', repr(c_resource))
to_sign = '\n'.join((req.method.upper(),
req.headers.get('Content-MD5', ''),
req.headers.get('Content-Type', ''),
req.headers.get('Date'),
c_headers + c_resource))
self.log.debug('string to sign: %s', repr(to_sign))
signature = self.sign_string(to_sign.encode('utf-8'))
self.log.debug('b64-encoded signature: %s', signature)
req.headers['Authorization'] = 'AWS {0}:{1}'.format(self.args['key_id'],
signature)
def get_canonicalized_resource(self, req):
# /bucket/keyname
parsed_req_path = urlparse.urlparse(req.url).path
assert self.service.endpoint is not None
parsed_svc_path = urlparse.urlparse(self.service.endpoint).path
# IMPORTANT: this only supports path-style requests
assert parsed_req_path.startswith(parsed_svc_path)
resource = parsed_req_path[len(parsed_svc_path):]
if parsed_svc_path.endswith('/'):
# The leading / got stripped off
resource = '/' + resource
# Now append sub-resources, a.k.a. query string parameters
if req.params:
subresources = []
for key, val in sorted(req.params.iteritems()):
if key in self.HASHED_PARAMS:
if val is None:
subresources.append(key)
else:
print '{0}={1}'.format(key, val), key + '=' + val
#subresources.append('{0}={1}'.format(key, val))
subresources.append(key + '=' + val)
if subresources:
resource += '?' + '&'.join(subresources)
return resource
def get_canonicalized_headers(self, req):
headers_dict = {}
for key, val in req.headers.iteritems():
if key.lower().startswith('x-amz-'):
headers_dict.setdefault(key.lower(), [])
headers_dict[key.lower()].append(' '.join(val.split()))
headers_strs = []
for key, vals in sorted(headers_dict.iteritems()):
headers_strs.append('{0}:{1}'.format(key, ','.join(vals)))
if headers_strs:
return '\n'.join(headers_strs) + '\n'
else:
return ''
def sign_string(self, to_sign):
req_hmac = hmac.new(self.args['secret_key'], digestmod=hashlib.sha1)
req_hmac.update(to_sign)
return base64.b64encode(req_hmac.digest())
class QuerySigV2Auth(HmacKeyAuth):
'''
AWS signature version 2
http://docs.amazonwebservices.com/general/latest/gr/signature-version-2.html
'''
def __call__(self, req):
if req.params is None:
req.params = {}
req.params['AWSAccessKeyId'] = self.args['key_id']
req.params['SignatureVersion'] = 2
req.params['SignatureMethod'] = 'HmacSHA256'
req.params['Timestamp'] = time.strftime(ISO8601, time.gmtime())
if 'Signature' in req.params:
# Needed for retries so old signatures aren't included in to_sign
del req.params['Signature']
parsed = urlparse.urlparse(req.url)
to_sign = '{method}\n{host}\n{path}\n'.format(method=req.method,
host=parsed.netloc.lower(), path=(parsed.path or '/'))
quoted_params = []
for key in sorted(req.params):
val = six.text_type(req.params[key])
quoted_params.append(urllib.quote(key, safe='') + '=' +
urllib.quote(val, safe='-_~'))
query_string = '&'.join(quoted_params)
to_sign += query_string
# Redact passwords
redacted_to_sign = re.sub('assword=[^&]*', 'assword=<redacted>',
to_sign)
self.log.debug('string to sign: %s', repr(redacted_to_sign))
signature = self.sign_string(to_sign)
self.log.debug('b64-encoded signature: %s', signature)
req.params['Signature'] = signature
self.convert_params_to_data(req)
return req
def convert_params_to_data(self, req):
if req.method.upper() == 'POST' and isinstance(req.params, dict):
# POST with params -> use params as form data instead
self.log.debug('converting params to POST data')
req.data = req.params
req.params = None
def sign_string(self, to_sign):
req_hmac = hmac.new(self.args['secret_key'], digestmod=hashlib.sha256)
req_hmac.update(to_sign)
return base64.b64encode(req_hmac.digest())
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