364 lines
15 KiB
Python
Executable File
364 lines
15 KiB
Python
Executable File
#!/usr/bin/env python
|
|
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
#
|
|
# Copyright (c) 2010-2011 OpenStack, LLC.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
|
|
# implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
"""
|
|
TOKEN-BASED AUTH MIDDLEWARE
|
|
|
|
This WSGI component performs multiple jobs:
|
|
- it verifies that incoming client requests have valid tokens by verifying
|
|
tokens with the auth service.
|
|
- it will reject unauthenticated requests UNLESS it is in 'delay_auth_decision'
|
|
mode, which means the final decision is delegated to the downstream WSGI
|
|
component (usually the OpenStack service)
|
|
- it will collect and forward identity information from a valid token
|
|
such as user name etc...
|
|
|
|
Refer to: http://wiki.openstack.org/openstack-authn
|
|
|
|
|
|
HEADERS
|
|
-------
|
|
Headers starting with HTTP_ is a standard http header
|
|
Headers starting with HTTP_X is an extended http header
|
|
|
|
> Coming in from initial call from client or customer
|
|
HTTP_X_AUTH_TOKEN : the client token being passed in
|
|
HTTP_X_STORAGE_TOKEN: the client token being passed in (legacy Rackspace use)
|
|
to support cloud files
|
|
> Used for communication between components
|
|
www-authenticate : only used if this component is being used remotely
|
|
HTTP_AUTHORIZATION : basic auth password used to validate the connection
|
|
|
|
> What we add to the request for use by the OpenStack service
|
|
HTTP_X_AUTHORIZATION: the client identity being passed in
|
|
|
|
"""
|
|
|
|
import eventlet
|
|
from eventlet import wsgi
|
|
import httplib
|
|
import json
|
|
import os
|
|
from paste.deploy import loadapp
|
|
from urlparse import urlparse
|
|
from webob.exc import HTTPUnauthorized, HTTPUseProxy
|
|
from webob.exc import Request, Response
|
|
import keystone.tools.tracer # @UnusedImport # module runs on import
|
|
|
|
from keystone.common.bufferedhttp import http_connect_raw as http_connect
|
|
|
|
PROTOCOL_NAME = "Token Authentication"
|
|
|
|
|
|
class AuthProtocol(object):
|
|
"""Auth Middleware that handles authenticating client calls"""
|
|
|
|
def _init_protocol_common(self, app, conf):
|
|
""" Common initialization code"""
|
|
print "Starting the %s component" % PROTOCOL_NAME
|
|
|
|
self.conf = conf
|
|
self.app = app
|
|
#if app is set, then we are in a WSGI pipeline and requests get passed
|
|
# on to app. If it is not set, this component should forward requests
|
|
|
|
# where to find the OpenStack service (if not in local WSGI chain)
|
|
# these settings are only used if this component is acting as a proxy
|
|
# and the OpenSTack service is running remotely
|
|
self.service_protocol = conf.get('service_protocol', 'https')
|
|
self.service_host = conf.get('service_host')
|
|
self.service_port = int(conf.get('service_port'))
|
|
self.service_url = '%s://%s:%s' % (self.service_protocol,
|
|
self.service_host,
|
|
self.service_port)
|
|
# used to verify this component with the OpenStack service or PAPIAuth
|
|
self.service_pass = conf.get('service_pass')
|
|
|
|
# delay_auth_decision means we still allow unauthenticated requests
|
|
# through and we let the downstream service make the final decision
|
|
self.delay_auth_decision = int(conf.get('delay_auth_decision', 0))
|
|
|
|
def _init_protocol(self, conf):
|
|
""" Protocol specific initialization """
|
|
|
|
# where to find the auth service (we use this to validate tokens)
|
|
self.auth_host = conf.get('auth_host')
|
|
self.auth_port = int(conf.get('auth_port'))
|
|
self.auth_protocol = conf.get('auth_protocol', 'https')
|
|
|
|
# where to tell clients to find the auth service (default to url
|
|
# constructed based on endpoint we have for the service to use)
|
|
self.auth_location = conf.get('auth_uri',
|
|
"%s://%s:%s" % (self.auth_protocol,
|
|
self.auth_host,
|
|
self.auth_port))
|
|
|
|
# Credentials used to verify this component with the Auth service since
|
|
# validating tokens is a privileged call
|
|
self.admin_token = conf.get('admin_token')
|
|
|
|
def __init__(self, app, conf):
|
|
""" Common initialization code """
|
|
|
|
#TODO(ziad): maybe we refactor this into a superclass
|
|
self._init_protocol_common(app, conf) # Applies to all protocols
|
|
self._init_protocol(conf) # Specific to this protocol
|
|
|
|
def __call__(self, env, start_response):
|
|
""" Handle incoming request. Authenticate. And send downstream. """
|
|
|
|
#Prep headers to forward request to local or remote downstream service
|
|
proxy_headers = env.copy()
|
|
for header in proxy_headers.iterkeys():
|
|
if header[0:5] == 'HTTP_':
|
|
proxy_headers[header[5:]] = proxy_headers[header]
|
|
del proxy_headers[header]
|
|
|
|
#Look for authentication claims
|
|
claims = self._get_claims(env)
|
|
if not claims:
|
|
#No claim(s) provided
|
|
if self.delay_auth_decision:
|
|
#Configured to allow downstream service to make final decision.
|
|
#So mark status as Invalid and forward the request downstream
|
|
self._decorate_request("X_IDENTITY_STATUS",
|
|
"Invalid", env, proxy_headers)
|
|
else:
|
|
#Respond to client as appropriate for this auth protocol
|
|
return self._reject_request(env, start_response)
|
|
else:
|
|
# this request is presenting claims. Let's validate them
|
|
valid = self._validate_claims(claims)
|
|
if not valid:
|
|
# Keystone rejected claim
|
|
if self.delay_auth_decision:
|
|
# Downstream service will receive call still and decide
|
|
self._decorate_request("X_IDENTITY_STATUS",
|
|
"Invalid", env, proxy_headers)
|
|
else:
|
|
#Respond to client as appropriate for this auth protocol
|
|
return self._reject_claims(env, start_response)
|
|
else:
|
|
self._decorate_request("X_IDENTITY_STATUS",
|
|
"Confirmed", env, proxy_headers)
|
|
|
|
#Collect information about valid claims
|
|
if valid:
|
|
claims = self._expound_claims(claims)
|
|
|
|
# Store authentication data
|
|
if claims:
|
|
self._decorate_request('X_AUTHORIZATION', "Proxy %s" %
|
|
claims['user'], env, proxy_headers)
|
|
self._decorate_request('X_TENANT',
|
|
claims['tenant'], env, proxy_headers)
|
|
self._decorate_request('X_USER',
|
|
claims['user'], env, proxy_headers)
|
|
if 'roles' in claims and len(claims['roles']) > 0:
|
|
if claims['roles'] != None:
|
|
roles = ''
|
|
for role in claims['roles']:
|
|
if len(roles) > 0:
|
|
roles += ','
|
|
roles += role
|
|
self._decorate_request('X_ROLE',
|
|
roles, env, proxy_headers)
|
|
|
|
# NOTE(todd): unused
|
|
self.expanded = True
|
|
|
|
#Send request downstream
|
|
return self._forward_request(env, start_response, proxy_headers)
|
|
|
|
# NOTE(todd): unused
|
|
def get_admin_auth_token(self, username, password):
|
|
"""
|
|
This function gets an admin auth token to be used by this service to
|
|
validate a user's token. Validate_token is a priviledged call so
|
|
it needs to be authenticated by a service that is calling it
|
|
"""
|
|
headers = {"Content-type": "application/json", "Accept": "text/json"}
|
|
params = {"passwordCredentials": {"username": username,
|
|
"password": password,
|
|
"tenantId": "1"}}
|
|
conn = httplib.HTTPConnection("%s:%s" \
|
|
% (self.auth_host, self.auth_port))
|
|
conn.request("POST", "/v2.0/tokens", json.dumps(params), \
|
|
headers=headers)
|
|
response = conn.getresponse()
|
|
data = response.read()
|
|
return data
|
|
|
|
def _get_claims(self, env):
|
|
"""Get claims from request"""
|
|
claims = env.get('HTTP_X_AUTH_TOKEN', env.get('HTTP_X_STORAGE_TOKEN'))
|
|
return claims
|
|
|
|
def _reject_request(self, env, start_response):
|
|
"""Redirect client to auth server"""
|
|
return HTTPUnauthorized("Authentication required",
|
|
[("WWW-Authenticate",
|
|
"Keystone uri='%s'" % self.auth_location)])(env,
|
|
start_response)
|
|
|
|
def _reject_claims(self, env, start_response):
|
|
"""Client sent bad claims"""
|
|
return HTTPUnauthorized()(env,
|
|
start_response)
|
|
|
|
def _validate_claims(self, claims):
|
|
"""Validate claims, and provide identity information isf applicable """
|
|
|
|
# Step 1: We need to auth with the keystone service, so get an
|
|
# admin token
|
|
#TODO(ziad): Need to properly implement this, where to store creds
|
|
# for now using token from ini
|
|
#auth = self.get_admin_auth_token("admin", "secrete", "1")
|
|
#admin_token = json.loads(auth)["auth"]["token"]["id"]
|
|
|
|
# Step 2: validate the user's token with the auth service
|
|
# since this is a priviledged op,m we need to auth ourselves
|
|
# by using an admin token
|
|
headers = {"Content-type": "application/json",
|
|
"Accept": "text/json",
|
|
"X-Auth-Token": self.admin_token}
|
|
##TODO(ziad):we need to figure out how to auth to keystone
|
|
#since validate_token is a priviledged call
|
|
#Khaled's version uses creds to get a token
|
|
# "X-Auth-Token": admin_token}
|
|
# we're using a test token from the ini file for now
|
|
conn = http_connect(self.auth_host, self.auth_port, 'GET',
|
|
'/v2.0/tokens/%s' % claims, headers=headers)
|
|
resp = conn.getresponse()
|
|
# data = resp.read()
|
|
conn.close()
|
|
|
|
if not str(resp.status).startswith('20'):
|
|
# Keystone rejected claim
|
|
return False
|
|
else:
|
|
#TODO(Ziad): there is an optimization we can do here. We have just
|
|
#received data from Keystone that we can use instead of making
|
|
#another call in _expound_claims
|
|
return True
|
|
|
|
def _expound_claims(self, claims):
|
|
# Valid token. Get user data and put it in to the call
|
|
# so the downstream service can use it
|
|
headers = {"Content-type": "application/json",
|
|
"Accept": "text/json",
|
|
"X-Auth-Token": self.admin_token}
|
|
##TODO(ziad):we need to figure out how to auth to keystone
|
|
#since validate_token is a priviledged call
|
|
#Khaled's version uses creds to get a token
|
|
# "X-Auth-Token": admin_token}
|
|
# we're using a test token from the ini file for now
|
|
conn = http_connect(self.auth_host, self.auth_port, 'GET',
|
|
'/v2.0/tokens/%s' % claims, headers=headers)
|
|
resp = conn.getresponse()
|
|
data = resp.read()
|
|
conn.close()
|
|
|
|
if not str(resp.status).startswith('20'):
|
|
raise LookupError('Unable to locate claims: %s' % resp.status)
|
|
|
|
token_info = json.loads(data)
|
|
roles = []
|
|
role_refs = token_info["auth"]["user"]["roleRefs"]
|
|
if role_refs != None:
|
|
for role_ref in role_refs:
|
|
roles.append(role_ref["roleId"])
|
|
|
|
try:
|
|
tenant = token_info['auth']['token']['tenantId']
|
|
except:
|
|
tenant = None
|
|
if not tenant:
|
|
tenant = token_info['auth']['user']['tenantId']
|
|
verified_claims = {'user': token_info['auth']['user']['username'],
|
|
'tenant': tenant,
|
|
'roles': roles}
|
|
return verified_claims
|
|
|
|
def _decorate_request(self, index, value, env, proxy_headers):
|
|
"""Add headers to request"""
|
|
proxy_headers[index] = value
|
|
env["HTTP_%s" % index] = value
|
|
|
|
def _forward_request(self, env, start_response, proxy_headers):
|
|
"""Token/Auth processed & claims added to headers"""
|
|
self._decorate_request('AUTHORIZATION',
|
|
"Basic %s" % self.service_pass, env, proxy_headers)
|
|
#now decide how to pass on the call
|
|
if self.app:
|
|
# Pass to downstream WSGI component
|
|
return self.app(env, start_response)
|
|
#.custom_start_response)
|
|
else:
|
|
# We are forwarding to a remote service (no downstream WSGI app)
|
|
req = Request(proxy_headers)
|
|
parsed = urlparse(req.url)
|
|
|
|
conn = http_connect(self.service_host,
|
|
self.service_port,
|
|
req.method,
|
|
parsed.path,
|
|
proxy_headers,
|
|
ssl=(self.service_protocol == 'https'))
|
|
resp = conn.getresponse()
|
|
data = resp.read()
|
|
|
|
#TODO(ziad): use a more sophisticated proxy
|
|
# we are rewriting the headers now
|
|
|
|
if resp.status == 401 or resp.status == 305:
|
|
# Add our own headers to the list
|
|
headers = [("WWW_AUTHENTICATE",
|
|
"Keystone uri='%s'" % self.auth_location)]
|
|
return Response(status=resp.status, body=data,
|
|
headerlist=headers)(env,
|
|
start_response)
|
|
else:
|
|
return Response(status=resp.status, body=data)(env,
|
|
start_response)
|
|
|
|
|
|
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 AuthProtocol(app, conf)
|
|
return auth_filter
|
|
|
|
|
|
def app_factory(global_conf, **local_conf):
|
|
conf = global_conf.copy()
|
|
conf.update(local_conf)
|
|
return AuthProtocol(None, conf)
|
|
|
|
if __name__ == "__main__":
|
|
app = loadapp("config:" + \
|
|
os.path.join(os.path.abspath(os.path.dirname(__file__)),
|
|
os.pardir,
|
|
os.pardir,
|
|
"examples/paste/auth_token.ini"),
|
|
global_conf={"log_name": "auth_token.log"})
|
|
wsgi.server(eventlet.listen(('', 8090)), app)
|