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# Copyright 2015 Open Platform for NFV Project, Inc. and its contributors
# This software is distributed under the terms and conditions of the 'Apache-2.0'
# license which can be found in the file 'LICENSE' in this package distribution
# or at 'http://www.apache.org/licenses/LICENSE-2.0'.
import webob
import logging
import json
import six
import requests
import re
import httplib
from keystone import exception
from cStringIO import StringIO
from oslo_config import cfg
# from keystoneclient import auth
from keystonemiddleware.i18n import _, _LC, _LE, _LI, _LW
_OPTS = [
cfg.StrOpt('auth_uri',
default="http://127.0.0.1:35357/v3",
help='Complete public Identity API endpoint.'),
cfg.StrOpt('auth_version',
default=None,
help='API version of the admin Identity API endpoint.'),
cfg.StrOpt('authz_login',
default="admin",
help='Name of the administrator who will connect to the Keystone Moon backends.'),
cfg.StrOpt('authz_password',
default="nomoresecrete",
help='Password of the administrator who will connect to the Keystone Moon backends.'),
cfg.StrOpt('logfile',
default="/tmp/authz.log",
help='File where logs goes.'),
]
_AUTHZ_GROUP = 'keystone_authz'
CONF = cfg.CONF
CONF.register_opts(_OPTS, group=_AUTHZ_GROUP)
CONF.debug = True
# auth.register_conf_options(CONF, _AUTHZ_GROUP)
# from http://developer.openstack.org/api-ref-objectstorage-v1.html
SWIFT_API = (
("^/v1/(?P<account>[\w_-]+)$", "GET", "get_account_details"),
("^/v1/(?P<account>[\w_-]+)$", "POST", "modify_account"),
("^/v1/(?P<account>[\w_-]+)$", "HEAD", "get_account"),
("^/v1/(?P<account>[\w_-]+)/(?P<container>[\w-]+)$", "GET", "get_container"),
("^/v1/(?P<account>[\w_-]+)/(?P<container>[\w-]+)$", "PUT", "create_container"),
("^/v1/(?P<account>[\w_-]+)/(?P<container>[\w-]+)$", "POST", "update_container_metadata"),
("^/v1/(?P<account>[\w_-]+)/(?P<container>[\w-]+)$", "DELETE", "delete_container"),
("^/v1/(?P<account>[\w_-]+)/(?P<container>[\w-]+)$", "HEAD", "get_container_metadata"),
("^/v1/(?P<account>[\w_-]+)/(?P<container>[\w-]+)/(?P<object>.+)$", "GET", "get_object"),
("^/v1/(?P<account>[\w_-]+)/(?P<container>[\w-]+)/(?P<object>.+)$", "PUT", "create_object"),
("^/v1/(?P<account>[\w_-]+)/(?P<container>[\w-]+)/(?P<object>.+)$", "COPY", "copy_object"),
("^/v1/(?P<account>[\w_-]+)/(?P<container>[\w-]+)/(?P<object>.+)$", "POST", "update_object_metadata"),
("^/v1/(?P<account>[\w_-]+)/(?P<container>[\w-]+)/(?P<object>.+)$", "DELETE", "delete_object"),
("^/v1/(?P<account>[\w_-]+)/(?P<container>[\w-]+)/(?P<object>.+)$", "HEAD", "get_object_metadata"),
)
class ServiceError(Exception):
pass
class AuthZProtocol(object):
"""Middleware that handles authenticating client calls."""
def __init__(self, app, conf):
self._LOG = logging.getLogger(conf.get('log_name', __name__))
# FIXME: events are duplicated in log file
authz_fh = logging.FileHandler(CONF.keystone_authz["logfile"])
self._LOG.setLevel(logging.DEBUG)
self._LOG.addHandler(authz_fh)
self._LOG.info(_LI('Starting Keystone authz middleware'))
self._conf = conf
self._app = app
# MOON
self.auth_host = conf.get('auth_host', "127.0.0.1")
self.auth_port = int(conf.get('auth_port', 35357))
auth_protocol = conf.get('auth_protocol', 'http')
self._request_uri = '%s://%s:%s' % (auth_protocol, self.auth_host,
self.auth_port)
# SSL
insecure = conf.get('insecure', False)
cert_file = conf.get('certfile')
key_file = conf.get('keyfile')
if insecure:
self._verify = False
elif cert_file and key_file:
self._verify = (cert_file, key_file)
elif cert_file:
self._verify = cert_file
else:
self._verify = None
def get_url(self, url):
conn = httplib.HTTPConnection(self.auth_host, self.auth_port)
headers = {
"Content-type": "application/x-www-form-urlencoded",
"Accept": "text/plain,text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
}
conn.request('GET', url, headers=headers)
resp = conn.getresponse()
content = resp.read()
conn.close()
try:
return json.loads(content)
except ValueError:
return {"content": content}
def _deny_request(self, code):
error_table = {
'AccessDenied': (401, 'Access denied'),
'InvalidURI': (400, 'Could not parse the specified URI'),
'NotFound': (404, 'URI not found'),
'Error': (500, 'Server error'),
}
resp = webob.Response(content_type='text/xml')
resp.status = error_table[code][0]
error_msg = ('<?xml version="1.0" encoding="UTF-8"?>\r\n'
'<Error>\r\n <Code>%s</Code>\r\n '
'<Message>%s</Message>\r\n</Error>\r\n' %
(code, error_table[code][1]))
if six.PY3:
error_msg = error_msg.encode()
resp.body = error_msg
return resp
def _get_authz_from_moon(self, tenant_id, subject_id, object_id, action_id):
try:
_url ='{}/v3/OS-MOON/authz/{}/{}/{}/{}'.format(
self._request_uri,
tenant_id,
subject_id,
object_id,
action_id)
self._LOG.info(_url)
response = requests.get(_url,verify=self._verify)
except requests.exceptions.RequestException as e:
self._LOG.error(_LI('HTTP connection exception: %s'), e)
resp = self._deny_request('InvalidURI')
raise ServiceError(resp)
if response.status_code < 200 or response.status_code >= 300:
self._LOG.debug('Keystone reply error: status=%s reason=%s',
response.status_code, response.reason)
if response.status_code == 404:
resp = self._deny_request('NotFound')
elif response.status_code == 401:
resp = self._deny_request('AccessDenied')
else:
resp = self._deny_request('Error')
raise ServiceError(resp)
return response
def _find_openstack_component(self, env):
if "nova.context" in env.keys():
return "nova"
elif "swift.authorize" in env.keys():
return "swift"
else:
self._LOG.debug(env.keys())
return "unknown"
def _get_action(self, env, component):
""" Find and return the action of the request
Actually, find only Nova (start, destroy, pause, unpause, ...) and swift actions
:param env: the request
:return: the action or ""
"""
action = ""
self.input = ""
if component == "nova":
length = int(env.get('CONTENT_LENGTH', '0'))
# TODO (dthom): compute for Nova, Cinder, Neutron, ...
action = ""
if length > 0:
try:
sub_action_object = env['wsgi.input'].read(length)
self.input = sub_action_object
action = json.loads(sub_action_object).keys()[0]
body = StringIO(sub_action_object)
env['wsgi.input'] = body
except ValueError:
self._LOG.error("Error in decoding sub-action")
except Exception as e:
self._LOG.error(str(e))
if not action or len(action) == 0 and "servers/detail" in env["PATH_INFO"]:
return "list"
if component == "swift":
path = env["PATH_INFO"]
method = env["REQUEST_METHOD"]
for api in SWIFT_API:
if re.match(api[0], path) and method == api[1]:
action = api[2]
length = int(env.get('CONTENT_LENGTH', '0'))
# TODO (dthom): compute for Nova, Cinder, Neutron, ...
_action = ""
if length > 0:
try:
sub_action_object = env['wsgi.input'].read(length)
self.input = sub_action_object
_action = json.loads(sub_action_object).keys()[0]
body = StringIO(sub_action_object)
env['wsgi.input'] = body
self._LOG.debug("wsgi.input={}".format(_action))
except ValueError:
self._LOG.error("Error in decoding sub-action")
except Exception as e:
self._LOG.error(str(e))
return action
@staticmethod
def _get_object(env, component):
if component == "nova":
# http://developer.openstack.org/api-ref-compute-v2.1.html
# nova URLs:
# /<tenant_id>/servers/<server_id>
# list details for server_id
# /<tenant_id>/servers/<server_id>/action
# execute action to server_id
# /<tenant_id>/servers/<server_id>/metadata
# show metadata from server_id
# /<tenant_id>/servers/details
# list servers
url = env.get("PATH_INFO").split("/")
if url[-1] == "detail":
return "servers"
try:
return url[3]
except IndexError:
return
elif component == "swift":
# remove the "/v1/" part of the URL
return env.get("PATH_INFO").split("/", 2)[-1].replace("/", "-").replace(".", "-")
return "unknown"
def __call__(self, env, start_response):
req = webob.Request(env)
subject_id = env.get("HTTP_X_USER_ID")
if not subject_id:
self._LOG.warning("No subject_id found for {}".format(env.get("PATH_INFO")))
return self._app(env, start_response)
tenant_id = env.get("HTTP_X_TENANT_ID")
if not tenant_id:
self._LOG.warning("No tenant_id found for {}".format(env.get("PATH_INFO")))
return self._app(env, start_response)
component = self._find_openstack_component(env)
action_id = self._get_action(env, component)
self._LOG.debug("\033[1m\033[31mrequest={}\033[m".format(env["PATH_INFO"]))
if action_id:
object_id = self._get_object(env, component)
if not object_id:
object_id = "servers"
self._LOG.debug("object_id={}".format(object_id))
resp = self._get_authz_from_moon(tenant_id, subject_id, object_id, action_id)
if resp.status_code == 200:
answer = json.loads(resp.content)
self._LOG.debug("action_id={}/{}".format(component, action_id))
self._LOG.debug(answer)
if "authz" in answer and answer["authz"]:
return self._app(env, start_response)
self._LOG.error("You are not authorized to do that! ({})".format(unicode(answer["comment"])))
raise exception.Unauthorized(message="You are not authorized to do that! ({})".format(unicode(answer["comment"])))
else:
self._LOG.error("Unable to request Moon ({}: {})".format(resp.status_code, resp.reason))
else:
self._LOG.debug("No action_id found for {}".format(env.get("PATH_INFO")))
# If action is not found, we can't raise an exception because a lots of action is missing
# in function self._get_action, it is not possible to get them all.
return self._app(env, start_response)
# raise exception.Unauthorized(message="You are not authorized to do that!")
def filter_factory(global_conf, **local_conf):
"""Returns a WSGI filter app for use with paste.deploy."""
conf = global_conf.copy()
conf.update(local_conf)
def auth_filter(app):
return AuthZProtocol(app, conf)
return auth_filter
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