265 lines
10 KiB
Python
265 lines
10 KiB
Python
#
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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 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 as json
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import requests
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import webob
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from heat.api.aws import exception
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from heat.common import endpoint_utils
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from heat.common.i18n import _
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from heat.common import wsgi
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LOG = logging.getLogger(__name__)
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opts = [
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cfg.StrOpt('auth_uri',
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help=_("Authentication Endpoint URI.")),
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cfg.BoolOpt('multi_cloud',
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default=False,
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help=_('Allow orchestration of multiple clouds.')),
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cfg.ListOpt('allowed_auth_uris',
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default=[],
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help=_('Allowed keystone endpoints for auth_uri when '
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'multi_cloud is enabled. At least one endpoint needs '
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'to be specified.')),
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cfg.StrOpt('cert_file',
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help=_('Optional PEM-formatted certificate chain file.')),
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cfg.StrOpt('key_file',
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help=_('Optional PEM-formatted file that contains the '
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'private key.')),
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cfg.StrOpt('ca_file',
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help=_('Optional CA cert file to use in SSL connections.')),
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cfg.BoolOpt('insecure',
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default=False,
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help=_('If set, then the server\'s certificate will not '
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'be verified.')),
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]
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cfg.CONF.register_opts(opts, group='ec2authtoken')
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class EC2Token(wsgi.Middleware):
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"""Authenticate an EC2 request with keystone and convert to token."""
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def __init__(self, app, conf):
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self.conf = conf
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self.application = app
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self._ssl_options = None
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def _conf_get(self, name):
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# try config from paste-deploy first
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if name in self.conf:
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return self.conf[name]
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else:
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return cfg.CONF.ec2authtoken[name]
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def _conf_get_auth_uri(self):
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auth_uri = self._conf_get('auth_uri')
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if auth_uri:
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return auth_uri.replace('v2.0', 'v3')
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else:
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return endpoint_utils.get_auth_uri()
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@staticmethod
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def _conf_get_keystone_ec2_uri(auth_uri):
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if auth_uri.endswith('ec2tokens'):
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return auth_uri
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if auth_uri.endswith('/'):
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return '%sec2tokens' % auth_uri
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return '%s/ec2tokens' % auth_uri
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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 v4 also in a header called
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'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 v 0/1/2/3 this is passed as the AccessKeyId parameter,
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for version4 it is either and X-Amz-Credential parameter or a
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Credential= 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(RequestClass=wsgi.Request)
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def __call__(self, req):
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if not self._conf_get('multi_cloud'):
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return self._authorize(req, self._conf_get_auth_uri())
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else:
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# attempt to authorize for each configured allowed_auth_uris
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# until one is successful.
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# This is safe for the following reasons:
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# 1. AWSAccessKeyId is a randomly generated sequence
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# 2. No secret is transferred to validate a request
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last_failure = None
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for auth_uri in self._conf_get('allowed_auth_uris'):
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try:
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LOG.debug("Attempt authorize on %s" % auth_uri)
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return self._authorize(req, auth_uri)
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except exception.HeatAPIException as e:
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LOG.debug("Authorize failed: %s" % e.__class__)
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last_failure = e
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raise last_failure or exception.HeatAccessDeniedError()
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@property
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def ssl_options(self):
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if not self._ssl_options:
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cacert = self._conf_get('ca_file')
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insecure = self._conf_get('insecure')
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cert = self._conf_get('cert_file')
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key = self._conf_get('key_file')
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self._ssl_options = {
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'verify': cacert if cacert else not insecure,
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'cert': (cert, key) if cert else None
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}
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return self._ssl_options
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def _authorize(self, req, auth_uri):
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# Read request signature and access id.
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# If we find X-Auth-User in the headers we ignore a key error
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# here so that we can use both authentication methods.
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# Returning here just means the user didn't supply AWS
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# authentication and we'll let the app try native keystone next.
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LOG.info("Checking AWS credentials..")
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signature = self._get_signature(req)
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if not signature:
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if 'X-Auth-User' in req.headers:
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return self.application
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else:
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LOG.info("No AWS Signature found.")
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raise exception.HeatIncompleteSignatureError()
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access = self._get_access(req)
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if not access:
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if 'X-Auth-User' in req.headers:
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return self.application
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else:
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LOG.info("No AWSAccessKeyId/Authorization Credential")
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raise exception.HeatMissingAuthenticationTokenError()
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LOG.info("AWS credentials found, checking against keystone.")
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if not auth_uri:
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LOG.error("Ec2Token authorization failed, no auth_uri "
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"specified in config file")
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raise exception.HeatInternalFailureError(_('Service '
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'misconfigured'))
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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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# 'Signature' param Not part of authentication args
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auth_params.pop('Signature', None)
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# Authenticate the request.
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# AWS v4 authentication requires a hash of the body
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body_hash = hashlib.sha256(req.body).hexdigest()
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creds = {'ec2Credentials': {'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': dict(req.headers),
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'body_hash': body_hash
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}}
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creds_json = json.dumps(creds)
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headers = {'Content-Type': 'application/json'}
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keystone_ec2_uri = self._conf_get_keystone_ec2_uri(auth_uri)
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LOG.info('Authenticating with %s', keystone_ec2_uri)
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response = requests.post(keystone_ec2_uri, data=creds_json,
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headers=headers,
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verify=self.ssl_options['verify'],
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cert=self.ssl_options['cert'])
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result = response.json()
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try:
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token_id = response.headers['X-Subject-Token']
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tenant = result['token']['project']['name']
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tenant_id = result['token']['project']['id']
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roles = [role['name']
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for role in result['token'].get('roles', [])]
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except (AttributeError, KeyError):
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LOG.info("AWS authentication failure.")
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# Try to extract the reason for failure so we can return the
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# appropriate AWS error via raising an exception
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try:
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reason = result['error']['message']
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except KeyError:
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reason = None
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if reason == "EC2 access key not found.":
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raise exception.HeatInvalidClientTokenIdError()
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elif reason == "EC2 signature not supplied.":
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raise exception.HeatSignatureError()
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else:
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raise exception.HeatAccessDeniedError()
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else:
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LOG.info("AWS authentication successful.")
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# Authenticated!
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ec2_creds = {'ec2Credentials': {'access': access,
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'signature': signature}}
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req.headers['X-Auth-EC2-Creds'] = json.dumps(ec2_creds)
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req.headers['X-Auth-Token'] = token_id
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req.headers['X-Tenant-Name'] = tenant
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req.headers['X-Tenant-Id'] = tenant_id
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req.headers['X-Auth-URL'] = auth_uri
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req.headers['X-Roles'] = ','.join(roles)
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return self.application
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def EC2Token_filter_factory(global_conf, **local_conf):
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"""Factory method for paste.deploy."""
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conf = global_conf.copy()
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conf.update(local_conf)
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def filter(app):
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return EC2Token(app, conf)
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return filter
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def list_opts():
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yield 'ec2authtoken', opts
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