openstack/python-keystoneclient
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8fe7a822d3fd9f435bb4a73a838b380659196cf7
python-keystoneclient/keystoneclient/middleware/auth_token.py
Adam Young 8fe7a822d3 Check Expiry 
Explicitly checks the expiry on the tokens, and rejects tokens that
have expired

had to regenerate the sample data for the tokens as they all had been
generated with values that are now expired.

bug 1179615

Change-Id: Ie06500d446f55fd0ad67ea540c92d8cfc57483f4
2013-05-28 16:47:54 +02:00

1169 lines
44 KiB
Python
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2010-2012 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:
* Verifies that incoming client requests have valid tokens by validating
tokens with the auth service.
* Rejects 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)
* Collects and forwards identity information based on a valid token
such as user name, tenant, etc
Refer to: http://keystone.openstack.org/middlewarearchitecture.html
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
swift/cloud files
Used for communication between components
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
WWW-Authenticate
HTTP header returned to a user indicating which endpoint to use
to retrieve a new token
What we add to the request for use by the OpenStack service
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
HTTP_X_IDENTITY_STATUS
'Confirmed' or 'Invalid'
The underlying service will only see a value of 'Invalid' if the Middleware
is configured to run in 'delay_auth_decision' mode
HTTP_X_DOMAIN_ID
Identity service managed unique identifier, string. Only present if
this is a domain-scoped v3 token.
HTTP_X_DOMAIN_NAME
Unique domain name, string. Only present if this is a domain-scoped
v3 token.
HTTP_X_PROJECT_ID
Identity service managed unique identifier, string. Only present if
this is a project-scoped v3 token, or a tenant-scoped v2 token.
HTTP_X_PROJECT_NAME
Project name, unique within owning domain, string. Only present if
this is a project-scoped v3 token, or a tenant-scoped v2 token.
HTTP_X_PROJECT_DOMAIN_ID
Identity service managed unique identifier of owning domain of
project, string. Only present if this is a project-scoped v3 token. If
this variable is set, this indicates that the PROJECT_NAME can only
be assumed to be unique within this domain.
HTTP_X_PROJECT_DOMAIN_NAME
Name of owning domain of project, string. Only present if this is a
project-scoped v3 token. If this variable is set, this indicates that
the PROJECT_NAME can only be assumed to be unique within this domain.
HTTP_X_USER_ID
Identity-service managed unique identifier, string
HTTP_X_USER_NAME
User identifier, unique within owning domain, string
HTTP_X_USER_DOMAIN_ID
Identity service managed unique identifier of owning domain of
user, string. If this variable is set, this indicates that the USER_NAME
can only be assumed to be unique within this domain.
HTTP_X_USER_DOMAIN_NAME
Name of owning domain of user, string. If this variable is set, this
indicates that the USER_NAME can only be assumed to be unique within
this domain.
HTTP_X_ROLES
Comma delimited list of case-sensitive role names
HTTP_X_SERVICE_CATALOG
json encoded keystone service catalog (optional).
HTTP_X_TENANT_ID
*Deprecated* in favor of HTTP_X_PROJECT_ID
Identity service managed unique identifier, string. For v3 tokens, this
will be set to the same value as HTTP_X_PROJECT_ID
HTTP_X_TENANT_NAME
*Deprecated* in favor of HTTP_X_PROJECT_NAME
Project identifier, unique within owning domain, string. For v3 tokens,
this will be set to the same value as HTTP_X_PROJECT_NAME
HTTP_X_TENANT
*Deprecated* in favor of HTTP_X_TENANT_ID and HTTP_X_TENANT_NAME
Keystone-assigned unique identifier, string. For v3 tokens, this
will be set to the same value as HTTP_X_PROJECT_ID
HTTP_X_USER
*Deprecated* in favor of HTTP_X_USER_ID and HTTP_X_USER_NAME
User name, unique within owning domain, string
HTTP_X_ROLE
*Deprecated* in favor of HTTP_X_ROLES
Will contain the same values as HTTP_X_ROLES.
OTHER ENVIRONMENT VARIABLES
---------------------------
keystone.token_info
Information about the token discovered in the process of
validation. This may include extended information returned by the
Keystone token validation call, as well as basic information about
the tenant and user.
"""
import datetime
import httplib
import json
import logging
import os
import stat
import tempfile
import time
import urllib
import webob.exc
from keystoneclient.openstack.common import jsonutils
from keystoneclient.common import cms
from keystoneclient import utils
from keystoneclient.middleware import memcache_crypt
from keystoneclient.openstack.common import memorycache
from keystoneclient.openstack.common import timeutils
CONF = None
# to pass gate before oslo-config is deployed everywhere,
# try application copies first
for app in 'nova', 'glance', 'quantum', 'cinder':
try:
cfg = __import__('%s.openstack.common.cfg' % app,
fromlist=['%s.openstack.common' % app])
# test which application middleware is running in
if hasattr(cfg, 'CONF') and 'config_file' in cfg.CONF:
CONF = cfg.CONF
break
except ImportError:
pass
if not CONF:
from oslo.config import cfg
CONF = cfg.CONF
# alternative middleware configuration in the main application's
# configuration file e.g. in nova.conf
# [keystone_authtoken]
# auth_host = 127.0.0.1
# auth_port = 35357
# auth_protocol = http
# admin_tenant_name = admin
# admin_user = admin
# admin_password = badpassword
# when deploy Keystone auth_token middleware with Swift, user may elect
# to use Swift memcache instead of the local Keystone memcache. Swift memcache
# is passed in from the request environment and its identified by the
# 'swift.cache' key. However it could be different, depending on deployment.
# To use Swift memcache, you must set the 'cache' option to the environment
# key where the Swift cache object is stored.
opts = [
cfg.StrOpt('auth_admin_prefix', default=''),
cfg.StrOpt('auth_host', default='127.0.0.1'),
cfg.IntOpt('auth_port', default=35357),
cfg.StrOpt('auth_protocol', default='https'),
cfg.StrOpt('auth_uri', default=None),
cfg.StrOpt('auth_version', default=None),
cfg.BoolOpt('delay_auth_decision', default=False),
cfg.BoolOpt('http_connect_timeout', default=None),
cfg.StrOpt('http_handler', default=None),
cfg.StrOpt('admin_token', secret=True),
cfg.StrOpt('admin_user'),
cfg.StrOpt('admin_password', secret=True),
cfg.StrOpt('admin_tenant_name', default='admin'),
cfg.StrOpt('cache', default=None), # env key for the swift cache
cfg.StrOpt('certfile'),
cfg.StrOpt('keyfile'),
cfg.StrOpt('signing_dir'),
cfg.ListOpt('memcache_servers'),
cfg.IntOpt('token_cache_time', default=300),
cfg.IntOpt('revocation_cache_time', default=1),
cfg.StrOpt('memcache_security_strategy', default=None),
cfg.StrOpt('memcache_secret_key', default=None, secret=True)
]
CONF.register_opts(opts, group='keystone_authtoken')
LIST_OF_VERSIONS_TO_ATTEMPT = ['v2.0', 'v3.0']
def will_expire_soon(expiry):
""" Determines if expiration is about to occur.
:param expiry: a datetime of the expected expiration
:returns: boolean : true if expiration is within 30 seconds
"""
soon = (timeutils.utcnow() + datetime.timedelta(seconds=30))
return expiry < soon
def safe_quote(s):
"""URL-encode strings that are not already URL-encoded."""
return urllib.quote(s) if s == urllib.unquote(s) else s
class InvalidUserToken(Exception):
pass
class ServiceError(Exception):
pass
class ConfigurationError(Exception):
pass
class AuthProtocol(object):
"""Auth Middleware that handles authenticating client calls."""
def __init__(self, app, conf):
self.LOG = logging.getLogger(conf.get('log_name', __name__))
self.LOG.info('Starting keystone auth_token middleware')
self.conf = conf
self.app = app
# delay_auth_decision means we still allow unauthenticated requests
# through and we let the downstream service make the final decision
self.delay_auth_decision = (self._conf_get('delay_auth_decision') in
(True, 'true', 't', '1', 'on', 'yes', 'y'))
# where to find the auth service (we use this to validate tokens)
self.auth_host = self._conf_get('auth_host')
self.auth_port = int(self._conf_get('auth_port'))
self.auth_protocol = self._conf_get('auth_protocol')
if not self._conf_get('http_handler'):
if self.auth_protocol == 'http':
self.http_client_class = httplib.HTTPConnection
else:
self.http_client_class = httplib.HTTPSConnection
else:
# Really only used for unit testing, since we need to
# have a fake handler set up before we issue an http
# request to get the list of versions supported by the
# server at the end of this initialization
self.http_client_class = self._conf_get('http_handler')
self.auth_admin_prefix = self._conf_get('auth_admin_prefix')
self.auth_uri = self._conf_get('auth_uri')
if self.auth_uri is None:
self.auth_uri = '%s://%s:%s' % (self.auth_protocol,
self.auth_host,
self.auth_port)
# SSL
self.cert_file = self._conf_get('certfile')
self.key_file = self._conf_get('keyfile')
# signing
self.signing_dirname = self._conf_get('signing_dir')
if self.signing_dirname is None:
self.signing_dirname = tempfile.mkdtemp(prefix='keystone-signing-')
self.LOG.info('Using %s as cache directory for signing certificate' %
self.signing_dirname)
if os.path.exists(self.signing_dirname):
if not os.access(self.signing_dirname, os.W_OK):
raise ConfigurationError(
'unable to access signing_dir %s' % self.signing_dirname)
if os.stat(self.signing_dirname).st_uid != os.getuid():
self.LOG.warning(
'signing_dir is not owned by %s' % os.getlogin())
current_mode = stat.S_IMODE(os.stat(self.signing_dirname).st_mode)
if current_mode != stat.S_IRWXU:
self.LOG.warning(
'signing_dir mode is %s instead of %s' %
(oct(current_mode), oct(stat.S_IRWXU)))
else:
os.makedirs(self.signing_dirname, stat.S_IRWXU)
val = '%s/signing_cert.pem' % self.signing_dirname
self.signing_cert_file_name = val
val = '%s/cacert.pem' % self.signing_dirname
self.ca_file_name = val
val = '%s/revoked.pem' % self.signing_dirname
self.revoked_file_name = val
# Credentials used to verify this component with the Auth service since
# validating tokens is a privileged call
self.admin_token = self._conf_get('admin_token')
self.admin_token_expiry = None
self.admin_user = self._conf_get('admin_user')
self.admin_password = self._conf_get('admin_password')
self.admin_tenant_name = self._conf_get('admin_tenant_name')
# Token caching via memcache
self._cache = None
self._use_keystone_cache = False
self._cache_initialized = False # cache already initialzied?
# memcache value treatment, ENCRYPT or MAC
self._memcache_security_strategy = \
self._conf_get('memcache_security_strategy')
if self._memcache_security_strategy is not None:
self._memcache_security_strategy = \
self._memcache_security_strategy.upper()
self._memcache_secret_key = \
self._conf_get('memcache_secret_key')
self._assert_valid_memcache_protection_config()
# By default the token will be cached for 5 minutes
self.token_cache_time = int(self._conf_get('token_cache_time'))
self._token_revocation_list = None
self._token_revocation_list_fetched_time = None
self.token_revocation_list_cache_timeout = datetime.timedelta(
seconds=self._conf_get('revocation_cache_time'))
http_connect_timeout_cfg = self._conf_get('http_connect_timeout')
self.http_connect_timeout = (http_connect_timeout_cfg and
int(http_connect_timeout_cfg))
self.auth_version = None
def _assert_valid_memcache_protection_config(self):
if self._memcache_security_strategy:
if self._memcache_security_strategy not in ('MAC', 'ENCRYPT'):
raise Exception('memcache_security_strategy must be '
'ENCRYPT or MAC')
if not self._memcache_secret_key:
raise Exception('mecmache_secret_key must be defined when '
'a memcache_security_strategy is defined')
def _init_cache(self, env):
cache = self._conf_get('cache')
memcache_servers = self._conf_get('memcache_servers')
if cache and env.get(cache, None) is not None:
# use the cache from the upstream filter
self.LOG.info('Using %s memcache for caching token', cache)
self._cache = env.get(cache)
else:
# use Keystone memcache
self._cache = memorycache.get_client(memcache_servers)
self._use_keystone_cache = True
self._cache_initialized = True
def _conf_get(self, name):
# try config from paste-deploy first
if name in self.conf:
return self.conf[name]
else:
return CONF.keystone_authtoken[name]
def _choose_api_version(self):
""" Determine the api version that we should use."""
# If the configuration specifies an auth_version we will just
# assume that is correct and use it. We could, of course, check
# that this version is supported by the server, but in case
# there are some problems in the field, we want as little code
# as possible in the way of letting auth_token talk to the
# server.
if self._conf_get('auth_version'):
version_to_use = self._conf_get('auth_version')
self.LOG.info('Auth Token proceeding with requested %s apis',
version_to_use)
else:
version_to_use = None
versions_supported_by_server = self._get_supported_versions()
if versions_supported_by_server:
for version in LIST_OF_VERSIONS_TO_ATTEMPT:
if version in versions_supported_by_server:
version_to_use = version
break
if version_to_use:
self.LOG.info('Auth Token confirmed use of %s apis',
version_to_use)
else:
self.LOG.error(
'Attempted versions [%s] not in list supported by '
'server [%s]',
', '.join(LIST_OF_VERSIONS_TO_ATTEMPT),
', '.join(versions_supported_by_server))
raise ServiceError('No compatible apis supported by server')
return version_to_use
def _get_supported_versions(self):
versions = []
response, data = self._json_request('GET', '/')
if response.status != 300:
self.LOG.error('Unable to get version info from keystone: %s' %
response.status)
raise ServiceError('Unable to get version info from keystone')
else:
try:
for version in data['versions']['values']:
versions.append(version['id'])
except KeyError:
self.LOG.error(
'Invalid version response format from server', data)
raise ServiceError('Unable to parse version response '
'from keystone')
self.LOG.debug('Server reports support for api versions: %s',
', '.join(versions))
return versions
def __call__(self, env, start_response):
"""Handle incoming request.
Authenticate send downstream on success. Reject request if
we can't authenticate.
"""
self.LOG.debug('Authenticating user token')
# initialize memcache if we haven't done so
if not self._cache_initialized:
self._init_cache(env)
try:
self._remove_auth_headers(env)
user_token = self._get_user_token_from_header(env)
token_info = self._validate_user_token(user_token)
env['keystone.token_info'] = token_info
user_headers = self._build_user_headers(token_info)
self._add_headers(env, user_headers)
return self.app(env, start_response)
except InvalidUserToken:
if self.delay_auth_decision:
self.LOG.info(
'Invalid user token - deferring reject downstream')
self._add_headers(env, {'X-Identity-Status': 'Invalid'})
return self.app(env, start_response)
else:
self.LOG.info('Invalid user token - rejecting request')
return self._reject_request(env, start_response)
except ServiceError as e:
self.LOG.critical('Unable to obtain admin token: %s' % e)
resp = webob.exc.HTTPServiceUnavailable()
return resp(env, start_response)
def _remove_auth_headers(self, env):
"""Remove headers so a user can't fake authentication.
:param env: wsgi request environment
"""
auth_headers = (
'X-Identity-Status',
'X-Domain-Id',
'X-Domain-Name',
'X-Project-Id',
'X-Project-Name',
'X-Project-Domain-Id',
'X-Project-Domain-Name',
'X-User-Id',
'X-User-Name',
'X-User-Domain-Id',
'X-User-Domain-Name',
'X-Roles',
'X-Service-Catalog',
# Deprecated
'X-User',
'X-Tenant-Id',
'X-Tenant-Name',
'X-Tenant',
'X-Role',
)
self.LOG.debug('Removing headers from request environment: %s' %
','.join(auth_headers))
self._remove_headers(env, auth_headers)
def _get_user_token_from_header(self, env):
"""Get token id from request.
:param env: wsgi request environment
:return token id
:raises InvalidUserToken if no token is provided in request
"""
token = self._get_header(env, 'X-Auth-Token',
self._get_header(env, 'X-Storage-Token'))
if token:
return token
else:
if not self.delay_auth_decision:
self.LOG.warn("Unable to find authentication token"
" in headers")
self.LOG.debug("Headers: %s", env)
raise InvalidUserToken('Unable to find token in headers')
def _reject_request(self, env, start_response):
"""Redirect client to auth server.
:param env: wsgi request environment
:param start_response: wsgi response callback
:returns HTTPUnauthorized http response
"""
headers = [('WWW-Authenticate', 'Keystone uri=\'%s\'' % self.auth_uri)]
resp = webob.exc.HTTPUnauthorized('Authentication required', headers)
return resp(env, start_response)
def get_admin_token(self):
"""Return admin token, possibly fetching a new one.
if self.admin_token_expiry is set from fetching an admin token, check
it for expiration, and request a new token is the existing token
is about to expire.
:return admin token id
:raise ServiceError when unable to retrieve token from keystone
"""
if self.admin_token_expiry:
if will_expire_soon(self.admin_token_expiry):
self.admin_token = None
if not self.admin_token:
(self.admin_token,
self.admin_token_expiry) = self._request_admin_token()
return self.admin_token
def _get_http_connection(self):
if self.auth_protocol == 'http':
return self.http_client_class(self.auth_host, self.auth_port,
timeout=self.http_connect_timeout)
else:
return self.http_client_class(self.auth_host,
self.auth_port,
self.key_file,
self.cert_file,
timeout=self.http_connect_timeout)
def _http_request(self, method, path, **kwargs):
"""HTTP request helper used to make unspecified content type requests.
:param method: http method
:param path: relative request url
:return (http response object, response body)
:raise ServerError when unable to communicate with keystone
"""
conn = self._get_http_connection()
RETRIES = 3
retry = 0
while True:
try:
conn.request(method, path, **kwargs)
response = conn.getresponse()
body = response.read()
break
except Exception as e:
if retry == RETRIES:
self.LOG.error('HTTP connection exception: %s' % e)
raise ServiceError('Unable to communicate with keystone')
# NOTE(vish): sleep 0.5, 1, 2
self.LOG.warn('Retrying on HTTP connection exception: %s' % e)
time.sleep(2.0 ** retry / 2)
retry += 1
finally:
conn.close()
return response, body
def _json_request(self, method, path, body=None, additional_headers=None):
"""HTTP request helper used to make json requests.
:param method: http method
:param path: relative request url
:param body: dict to encode to json as request body. Optional.
:param additional_headers: dict of additional headers to send with
http request. Optional.
:return (http response object, response body parsed as json)
:raise ServerError when unable to communicate with keystone
"""
kwargs = {
'headers': {
'Content-type': 'application/json',
'Accept': 'application/json',
},
}
if additional_headers:
kwargs['headers'].update(additional_headers)
if body:
kwargs['body'] = jsonutils.dumps(body)
path = self.auth_admin_prefix + path
response, body = self._http_request(method, path, **kwargs)
try:
data = jsonutils.loads(body)
except ValueError:
self.LOG.debug('Keystone did not return json-encoded body')
data = {}
return response, data
def _request_admin_token(self):
"""Retrieve new token as admin user from keystone.
:return token id upon success
:raises ServerError when unable to communicate with keystone
Irrespective of the auth version we are going to use for the
user token, for simplicity we always use a v2 admin token to
validate the user token.
"""
params = {
'auth': {
'passwordCredentials': {
'username': self.admin_user,
'password': self.admin_password,
},
'tenantName': self.admin_tenant_name,
}
}
response, data = self._json_request('POST',
'/v2.0/tokens',
body=params)
try:
token = data['access']['token']['id']
expiry = data['access']['token']['expires']
assert token
assert expiry
datetime_expiry = timeutils.parse_isotime(expiry)
return (token, timeutils.normalize_time(datetime_expiry))
except (AssertionError, KeyError):
self.LOG.warn(
"Unexpected response from keystone service: %s", data)
raise ServiceError('invalid json response')
except (ValueError):
self.LOG.warn(
"Unable to parse expiration time from token: %s", data)
raise ServiceError('invalid json response')
def _validate_user_token(self, user_token, retry=True):
"""Authenticate user using PKI
:param user_token: user's token id
:param retry: Ignored, as it is not longer relevant
:return uncrypted body of the token if the token is valid
:raise InvalidUserToken if token is rejected
:no longer raises ServiceError since it no longer makes RPC
"""
try:
token_id = cms.cms_hash_token(user_token)
cached = self._cache_get(token_id)
if cached:
return cached
if cms.is_ans1_token(user_token):
verified = self.verify_signed_token(user_token)
data = json.loads(verified)
else:
data = self.verify_uuid_token(user_token, retry)
expires = self._confirm_token_not_expired(data)
self._cache_put(token_id, data, expires)
return data
except Exception as e:
self.LOG.debug('Token validation failure.', exc_info=True)
self._cache_store_invalid(user_token)
self.LOG.warn("Authorization failed for token %s", user_token)
raise InvalidUserToken('Token authorization failed')
def _token_is_v2(self, token_info):
return ('access' in token_info)
def _token_is_v3(self, token_info):
return ('token' in token_info)
def _build_user_headers(self, token_info):
"""Convert token object into headers.
Build headers that represent authenticated user - see main
doc info at start of file for details of headers to be defined.
:param token_info: token object returned by keystone on authentication
:raise InvalidUserToken when unable to parse token object
"""
def get_tenant_info():
"""Returns a (tenant_id, tenant_name) tuple from context."""
def essex():
"""Essex puts the tenant ID and name on the token."""
return (token['tenant']['id'], token['tenant']['name'])
def pre_diablo():
"""Pre-diablo, Keystone only provided tenantId."""
return (token['tenantId'], token['tenantId'])
def default_tenant():
"""Pre-grizzly, assume the user's default tenant."""
return (user['tenantId'], user['tenantName'])
for method in [essex, pre_diablo, default_tenant]:
try:
return method()
except KeyError:
pass
raise InvalidUserToken('Unable to determine tenancy.')
# For clarity. set all those attributes that are optional in
# either a v2 or v3 token to None first
domain_id = None
domain_name = None
project_id = None
project_name = None
user_domain_id = None
user_domain_name = None
project_domain_id = None
project_domain_name = None
if self._token_is_v2(token_info):
user = token_info['access']['user']
token = token_info['access']['token']
roles = ','.join([role['name'] for role in user.get('roles', [])])
catalog_root = token_info['access']
catalog_key = 'serviceCatalog'
project_id, project_name = get_tenant_info()
else:
#v3 token
token = token_info['token']
user = token['user']
user_domain_id = user['domain']['id']
user_domain_name = user['domain']['name']
roles = (','.join([role['name']
for role in token.get('roles', [])]))
catalog_root = token
catalog_key = 'catalog'
# For v3, the server will put in the default project if there is
# one, so no need for us to add it here (like we do for a v2 token)
if 'domain' in token:
domain_id = token['domain']['id']
domain_name = token['domain']['name']
elif 'project' in token:
project_id = token['project']['id']
project_name = token['project']['name']
project_domain_id = token['project']['domain']['id']
project_domain_name = token['project']['domain']['name']
user_id = user['id']
user_name = user['name']
rval = {
'X-Identity-Status': 'Confirmed',
'X-Domain-Id': domain_id,
'X-Domain-Name': domain_name,
'X-Project-Id': project_id,
'X-Project-Name': project_name,
'X-Project-Domain-Id': project_domain_id,
'X-Project-Domain-Name': project_domain_name,
'X-User-Id': user_id,
'X-User-Name': user_name,
'X-User-Domain-Id': user_domain_id,
'X-User-Domain-Name': user_domain_name,
'X-Roles': roles,
# Deprecated
'X-User': user_name,
'X-Tenant-Id': project_id,
'X-Tenant-Name': project_name,
'X-Tenant': project_name,
'X-Role': roles,
}
try:
catalog = catalog_root[catalog_key]
rval['X-Service-Catalog'] = jsonutils.dumps(catalog)
except KeyError:
pass
return rval
def _header_to_env_var(self, key):
"""Convert header to wsgi env variable.
:param key: http header name (ex. 'X-Auth-Token')
:return wsgi env variable name (ex. 'HTTP_X_AUTH_TOKEN')
"""
return 'HTTP_%s' % key.replace('-', '_').upper()
def _add_headers(self, env, headers):
"""Add http headers to environment."""
for (k, v) in headers.iteritems():
env_key = self._header_to_env_var(k)
env[env_key] = v
def _remove_headers(self, env, keys):
"""Remove http headers from environment."""
for k in keys:
env_key = self._header_to_env_var(k)
try:
del env[env_key]
except KeyError:
pass
def _get_header(self, env, key, default=None):
"""Get http header from environment."""
env_key = self._header_to_env_var(key)
return env.get(env_key, default)
def _protect_cache_value(self, token, data):
""" Encrypt or sign data if necessary. """
try:
if self._memcache_security_strategy == 'ENCRYPT':
return memcache_crypt.encrypt_data(token,
self._memcache_secret_key,
data)
elif self._memcache_security_strategy == 'MAC':
return memcache_crypt.sign_data(token, data)
else:
return data
except:
msg = 'Failed to encrypt/sign cache data.'
self.LOG.exception(msg)
return data
def _unprotect_cache_value(self, token, data):
""" Decrypt or verify signed data if necessary. """
if data is None:
return data
try:
if self._memcache_security_strategy == 'ENCRYPT':
return memcache_crypt.decrypt_data(token,
self._memcache_secret_key,
data)
elif self._memcache_security_strategy == 'MAC':
return memcache_crypt.verify_signed_data(token, data)
else:
return data
except:
msg = 'Failed to decrypt/verify cache data.'
self.LOG.exception(msg)
# this should have the same effect as data not found in cache
return None
def _get_cache_key(self, token):
""" Return the cache key.
Do not use clear token as key if memcache protection is on.
"""
htoken = token
if self._memcache_security_strategy in ('ENCRYPT', 'MAC'):
derv_token = token + self._memcache_secret_key
htoken = memcache_crypt.hash_data(derv_token)
return 'tokens/%s' % htoken
def _cache_get(self, token):
"""Return token information from cache.
If token is invalid raise InvalidUserToken
return token only if fresh (not expired).
"""
if self._cache and token:
key = self._get_cache_key(token)
cached = self._cache.get(key)
cached = self._unprotect_cache_value(token, cached)
if cached == 'invalid':
self.LOG.debug('Cached Token %s is marked unauthorized', token)
raise InvalidUserToken('Token authorization failed')
if cached:
data, expires = cached
if time.time() < float(expires):
self.LOG.debug('Returning cached token %s', token)
return data
else:
self.LOG.debug('Cached Token %s seems expired', token)
def _cache_store(self, token, data, expires=None):
""" Store value into memcache. """
key = self._get_cache_key(token)
data = self._protect_cache_value(token, data)
data_to_store = data
if expires:
data_to_store = (data, expires)
# we need to special-case set() because of the incompatibility between
# Swift MemcacheRing and python-memcached. See
# https://bugs.launchpad.net/swift/+bug/1095730
if self._use_keystone_cache:
self._cache.set(key,
data_to_store,
time=self.token_cache_time)
else:
self._cache.set(key,
data_to_store,
timeout=self.token_cache_time)
def _confirm_token_not_expired(self, data):
if not data:
raise InvalidUserToken('Token authorization failed')
if self._token_is_v2(data):
timestamp = data['access']['token']['expires']
elif self._token_is_v3(data):
timestamp = data['token']['expires_at']
else:
raise InvalidUserToken('Token authorization failed')
expires = timeutils.parse_isotime(timestamp).strftime('%s')
if time.time() >= float(expires):
self.LOG.debug('Token expired a %s', timestamp)
raise InvalidUserToken('Token authorization failed')
return expires
def _cache_put(self, token, data, expires):
""" Put token data into the cache.
Stores the parsed expire date in cache allowing
quick check of token freshness on retrieval.
"""
if self._cache:
self.LOG.debug('Storing %s token in memcache', token)
self._cache_store(token, data, expires)
def _cache_store_invalid(self, token):
"""Store invalid token in cache."""
if self._cache:
self.LOG.debug(
'Marking token %s as unauthorized in memcache', token)
self._cache_store(token, 'invalid')
def cert_file_missing(self, proc_output, file_name):
return (file_name in proc_output and not os.path.exists(file_name))
def verify_uuid_token(self, user_token, retry=True):
"""Authenticate user token with keystone.
:param user_token: user's token id
:param retry: flag that forces the middleware to retry
user authentication when an indeterminate
response is received. Optional.
:return token object received from keystone on success
:raise InvalidUserToken if token is rejected
:raise ServiceError if unable to authenticate token
"""
# Determine the highest api version we can use.
if not self.auth_version:
self.auth_version = self._choose_api_version()
if self.auth_version == 'v3.0':
headers = {'X-Auth-Token': self.get_admin_token(),
'X-Subject-Token': safe_quote(user_token)}
response, data = self._json_request(
'GET',
'/v3/auth/tokens',
additional_headers=headers)
else:
headers = {'X-Auth-Token': self.get_admin_token()}
response, data = self._json_request(
'GET',
'/v2.0/tokens/%s' % safe_quote(user_token),
additional_headers=headers)
if response.status == 200:
return data
if response.status == 404:
self.LOG.warn("Authorization failed for token %s", user_token)
raise InvalidUserToken('Token authorization failed')
if response.status == 401:
self.LOG.info(
'Keystone rejected admin token %s, resetting', headers)
self.admin_token = None
else:
self.LOG.error('Bad response code while validating token: %s' %
response.status)
if retry:
self.LOG.info('Retrying validation')
return self._validate_user_token(user_token, False)
else:
self.LOG.warn("Invalid user token: %s. Keystone response: %s.",
user_token, data)
raise InvalidUserToken()
def is_signed_token_revoked(self, signed_text):
"""Indicate whether the token appears in the revocation list."""
revocation_list = self.token_revocation_list
revoked_tokens = revocation_list.get('revoked', [])
if not revoked_tokens:
return
revoked_ids = (x['id'] for x in revoked_tokens)
token_id = utils.hash_signed_token(signed_text)
for revoked_id in revoked_ids:
if token_id == revoked_id:
self.LOG.debug('Token %s is marked as having been revoked',
token_id)
return True
return False
def cms_verify(self, data):
"""Verifies the signature of the provided data's IAW CMS syntax.
If either of the certificate files are missing, fetch them and
retry.
"""
while True:
try:
output = cms.cms_verify(data, self.signing_cert_file_name,
self.ca_file_name)
except cms.subprocess.CalledProcessError as err:
if self.cert_file_missing(err.output,
self.signing_cert_file_name):
self.fetch_signing_cert()
continue
if self.cert_file_missing(err.output, self.ca_file_name):
self.fetch_ca_cert()
continue
raise err
return output
def verify_signed_token(self, signed_text):
"""Check that the token is unrevoked and has a valid signature."""
if self.is_signed_token_revoked(signed_text):
raise InvalidUserToken('Token has been revoked')
formatted = cms.token_to_cms(signed_text)
return self.cms_verify(formatted)
@property
def token_revocation_list_fetched_time(self):
if not self._token_revocation_list_fetched_time:
# If the fetched list has been written to disk, use its
# modification time.
if os.path.exists(self.revoked_file_name):
mtime = os.path.getmtime(self.revoked_file_name)
fetched_time = datetime.datetime.fromtimestamp(mtime)
# Otherwise the list will need to be fetched.
else:
fetched_time = datetime.datetime.min
self._token_revocation_list_fetched_time = fetched_time
return self._token_revocation_list_fetched_time
@token_revocation_list_fetched_time.setter
def token_revocation_list_fetched_time(self, value):
self._token_revocation_list_fetched_time = value
@property
def token_revocation_list(self):
timeout = (self.token_revocation_list_fetched_time +
self.token_revocation_list_cache_timeout)
list_is_current = timeutils.utcnow() < timeout
if list_is_current:
# Load the list from disk if required
if not self._token_revocation_list:
with open(self.revoked_file_name, 'r') as f:
self._token_revocation_list = jsonutils.loads(f.read())
else:
self.token_revocation_list = self.fetch_revocation_list()
return self._token_revocation_list
@token_revocation_list.setter
def token_revocation_list(self, value):
"""Save a revocation list to memory and to disk.
:param value: A json-encoded revocation list
"""
self._token_revocation_list = jsonutils.loads(value)
self.token_revocation_list_fetched_time = timeutils.utcnow()
with open(self.revoked_file_name, 'w') as f:
f.write(value)
def fetch_revocation_list(self, retry=True):
headers = {'X-Auth-Token': self.get_admin_token()}
response, data = self._json_request('GET', '/v2.0/tokens/revoked',
additional_headers=headers)
if response.status == 401:
if retry:
self.LOG.info(
'Keystone rejected admin token %s, resetting admin token',
headers)
self.admin_token = None
return self.fetch_revocation_list(retry=False)
if response.status != 200:
raise ServiceError('Unable to fetch token revocation list.')
if (not 'signed' in data):
raise ServiceError('Revocation list inmproperly formatted.')
return self.cms_verify(data['signed'])
def fetch_signing_cert(self):
response, data = self._http_request('GET',
'/v2.0/certificates/signing')
try:
#todo check response
certfile = open(self.signing_cert_file_name, 'w')
certfile.write(data)
certfile.close()
except (AssertionError, KeyError):
self.LOG.warn(
"Unexpected response from keystone service: %s", data)
raise ServiceError('invalid json response')
def fetch_ca_cert(self):
response, data = self._http_request('GET',
'/v2.0/certificates/ca')
try:
#todo check response
certfile = open(self.ca_file_name, 'w')
certfile.write(data)
certfile.close()
except (AssertionError, KeyError):
self.LOG.warn(
"Unexpected response from keystone service: %s", data)
raise ServiceError('invalid json 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)
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