214 lines
7.8 KiB
Python
214 lines
7.8 KiB
Python
# Copyright 2012 OpenStack Foundation
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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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"""Starting point for routing EC2 requests."""
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import hashlib
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from oslo_config import cfg
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from oslo_log import log as logging
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from oslo_serialization import jsonutils
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import requests
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import six
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import webob.dec
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from keystonemiddleware.i18n import _
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keystone_ec2_opts = [
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cfg.StrOpt('url',
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default='http://localhost:5000/v3/ec2tokens',
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help='URL to get token from ec2 request.'),
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cfg.StrOpt('keyfile',
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help='Required if EC2 server requires client certificate.'),
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cfg.StrOpt('certfile',
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help='Client certificate key filename. Required if EC2 server '
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'requires client certificate.'),
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cfg.StrOpt('cafile',
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help='A PEM encoded certificate authority to use when '
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'verifying HTTPS connections. Defaults to the system '
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'CAs.'),
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cfg.BoolOpt('insecure', default=False,
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help='Disable SSL certificate verification.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(keystone_ec2_opts, group='keystone_ec2_token')
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PROTOCOL_NAME = 'EC2 Token Authentication'
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class EC2Token(object):
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"""Authenticate an EC2 request with keystone and convert to token."""
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def __init__(self, application, conf):
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super(EC2Token, self).__init__()
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self._application = application
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self._logger = logging.getLogger(conf.get('log_name', __name__))
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self._logger.debug('Starting the %s component', PROTOCOL_NAME)
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def _ec2_error_response(self, code, message):
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"""Helper to construct an EC2 compatible error message."""
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self._logger.debug('EC2 error response: %(code)s: %(message)s',
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{'code': code, 'message': message})
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resp = webob.Response()
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resp.status = 400
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resp.headers['Content-Type'] = 'text/xml'
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error_msg = str('<?xml version="1.0"?>\n'
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'<Response><Errors><Error><Code>%s</Code>'
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'<Message>%s</Message></Error></Errors></Response>' %
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(code, message))
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if six.PY3:
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error_msg = error_msg.encode()
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resp.body = error_msg
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return resp
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def _get_signature(self, req):
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"""Extract the signature from the request.
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This can be a get/post variable or for version 4 also in a header
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called 'Authorization'.
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- params['Signature'] == version 0,1,2,3
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- params['X-Amz-Signature'] == version 4
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- header 'Authorization' == version 4
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"""
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sig = req.params.get('Signature') or req.params.get('X-Amz-Signature')
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if sig is None and 'Authorization' in req.headers:
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auth_str = req.headers['Authorization']
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sig = auth_str.partition("Signature=")[2].split(',')[0]
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return sig
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def _get_access(self, req):
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"""Extract the access key identifier.
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For version 0/1/2/3 this is passed as the AccessKeyId parameter, for
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version 4 it is either an X-Amz-Credential parameter or a Credential=
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field in the 'Authorization' header string.
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"""
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access = req.params.get('AWSAccessKeyId')
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if access is None:
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cred_param = req.params.get('X-Amz-Credential')
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if cred_param:
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access = cred_param.split("/")[0]
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if access is None and 'Authorization' in req.headers:
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auth_str = req.headers['Authorization']
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cred_str = auth_str.partition("Credential=")[2].split(',')[0]
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access = cred_str.split("/")[0]
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return access
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@webob.dec.wsgify()
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def __call__(self, req):
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# NOTE(alevine): We need to calculate the hash here because
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# subsequent access to request modifies the req.body so the hash
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# calculation will yield invalid results.
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body_hash = hashlib.sha256(req.body).hexdigest()
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signature = self._get_signature(req)
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if not signature:
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msg = _("Signature not provided")
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return self._ec2_error_response("AuthFailure", msg)
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access = self._get_access(req)
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if not access:
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msg = _("Access key not provided")
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return self._ec2_error_response("AuthFailure", msg)
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if 'X-Amz-Signature' in req.params or 'Authorization' in req.headers:
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auth_params = {}
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else:
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# Make a copy of args for authentication and signature verification
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auth_params = dict(req.params)
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# Not part of authentication args
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auth_params.pop('Signature', None)
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headers = req.headers
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if six.PY3:
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# NOTE(andrey-mp): jsonutils dumps it as list of keys without
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# conversion instead real dict
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headers = {k: headers[k] for k in headers}
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cred_dict = {
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'access': access,
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'signature': signature,
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'host': req.host,
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'verb': req.method,
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'path': req.path,
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'params': auth_params,
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'headers': headers,
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'body_hash': body_hash
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}
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if "ec2" in CONF.keystone_ec2_token.url:
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creds = {'ec2Credentials': cred_dict}
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else:
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creds = {'auth': {'OS-KSEC2:ec2Credentials': cred_dict}}
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creds_json = jsonutils.dumps(creds)
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headers = {'Content-Type': 'application/json'}
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verify = not CONF.keystone_ec2_token.insecure
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if verify and CONF.keystone_ec2_token.cafile:
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verify = CONF.keystone_ec2_token.cafile
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cert = None
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if (CONF.keystone_ec2_token.certfile and
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CONF.keystone_ec2_token.keyfile):
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cert = (CONF.keystone_ec2_certfile,
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CONF.keystone_ec2_token.keyfile)
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elif CONF.keystone_ec2_token.certfile:
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cert = CONF.keystone_ec2_token.certfile
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response = requests.request('POST', CONF.keystone_ec2_token.url,
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data=creds_json, headers=headers,
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verify=verify, cert=cert)
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# NOTE(vish): We could save a call to keystone by
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# having keystone return token, tenant,
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# user, and roles from this call.
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status_code = response.status_code
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if status_code != 200:
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msg = _('Error response from keystone: %s') % response.reason
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self._logger.debug(msg)
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return self._ec2_error_response("AuthFailure", msg)
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try:
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token_id = response.headers['x-subject-token']
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except (AttributeError, KeyError):
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msg = _("Failure parsing response from keystone")
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self._logger.exception(msg)
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return self._ec2_error_response("AuthFailure", msg)
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# Authenticated!
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req.headers['X-Auth-Token'] = token_id
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return self._application
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def filter_factory(global_conf, **local_conf):
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"""Return a WSGI filter app for use with paste.deploy."""
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conf = global_conf.copy()
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conf.update(local_conf)
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def auth_filter(app):
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return EC2Token(app, conf)
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return auth_filter
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def app_factory(global_conf, **local_conf):
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conf = global_conf.copy()
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conf.update(local_conf)
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return EC2Token(None, conf)
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