214 lines
9.2 KiB
Python
214 lines
9.2 KiB
Python
# Copyright (c) 2010-2011 OpenStack, LLC.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from time import time
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from eventlet.timeout import Timeout
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from webob.exc import HTTPForbidden, HTTPUnauthorized, HTTPNotFound
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from swift.common.bufferedhttp import http_connect_raw as http_connect
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from swift.common.middleware.acl import clean_acl, parse_acl, referrer_allowed
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from swift.common.utils import cache_from_env, split_path, TRUE_VALUES
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class DevAuth(object):
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"""Auth Middleware that uses the dev auth server."""
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def __init__(self, app, conf):
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self.app = app
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self.conf = conf
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self.reseller_prefix = conf.get('reseller_prefix', 'AUTH').strip()
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if self.reseller_prefix and self.reseller_prefix[-1] != '_':
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self.reseller_prefix += '_'
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self.auth_host = conf.get('ip', '127.0.0.1')
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self.auth_port = int(conf.get('port', 11000))
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self.ssl = conf.get('ssl', 'false').lower() in TRUE_VALUES
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self.auth_prefix = conf.get('prefix', '/')
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self.timeout = int(conf.get('node_timeout', 10))
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def __call__(self, env, start_response):
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"""
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Accepts a standard WSGI application call, authenticating the request
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and installing callback hooks for authorization and ACL header
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validation. For an authenticated request, REMOTE_USER will be set to a
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comma separated list of the user's groups.
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With a non-empty reseller prefix, acts as the definitive auth service
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for just tokens and accounts that begin with that prefix, but will deny
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requests outside this prefix if no other auth middleware overrides it.
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With an empty reseller prefix, acts as the definitive auth service only
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for tokens that validate to a non-empty set of groups. For all other
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requests, acts as the fallback auth service when no other auth
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middleware overrides it.
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"""
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s3 = env.get('HTTP_AUTHORIZATION')
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token = env.get('HTTP_X_AUTH_TOKEN', env.get('HTTP_X_STORAGE_TOKEN'))
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if s3 or (token and token.startswith(self.reseller_prefix)):
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# Note: Empty reseller_prefix will match all tokens.
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# Attempt to auth my token with my auth server
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groups = self.get_groups(env, token,
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memcache_client=cache_from_env(env))
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if groups:
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env['REMOTE_USER'] = groups
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user = groups and groups.split(',', 1)[0] or ''
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# We know the proxy logs the token, so we augment it just a bit
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# to also log the authenticated user.
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env['HTTP_X_AUTH_TOKEN'] = '%s,%s' % (user, token)
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env['swift.authorize'] = self.authorize
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env['swift.clean_acl'] = clean_acl
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else:
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# Unauthorized token
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if self.reseller_prefix:
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# Because I know I'm the definitive auth for this token, I
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# can deny it outright.
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return HTTPUnauthorized()(env, start_response)
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# Because I'm not certain if I'm the definitive auth for empty
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# reseller_prefixed tokens, I won't overwrite swift.authorize.
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elif 'swift.authorize' not in env:
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env['swift.authorize'] = self.denied_response
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else:
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if self.reseller_prefix:
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# With a non-empty reseller_prefix, I would like to be called
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# back for anonymous access to accounts I know I'm the
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# definitive auth for.
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try:
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version, rest = split_path(env.get('PATH_INFO', ''),
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1, 2, True)
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except ValueError:
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return HTTPNotFound()(env, start_response)
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if rest and rest.startswith(self.reseller_prefix):
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# Handle anonymous access to accounts I'm the definitive
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# auth for.
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env['swift.authorize'] = self.authorize
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env['swift.clean_acl'] = clean_acl
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# Not my token, not my account, I can't authorize this request,
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# deny all is a good idea if not already set...
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elif 'swift.authorize' not in env:
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env['swift.authorize'] = self.denied_response
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# Because I'm not certain if I'm the definitive auth for empty
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# reseller_prefixed accounts, I won't overwrite swift.authorize.
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elif 'swift.authorize' not in env:
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env['swift.authorize'] = self.authorize
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env['swift.clean_acl'] = clean_acl
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return self.app(env, start_response)
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def get_groups(self, env, token, memcache_client=None):
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"""
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Get groups for the given token.
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If memcache_client is set, token credentials will be cached
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appropriately.
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With a cache miss, or no memcache_client, the configurated external
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authentication server will be queried for the group information.
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:param token: Token to validate and return a group string for.
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:param memcache_client: Memcached client to use for caching token
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credentials; None if no caching is desired.
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:returns: None if the token is invalid or a string containing a comma
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separated list of groups the authenticated user is a member
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of. The first group in the list is also considered a unique
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identifier for that user.
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"""
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groups = None
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key = '%s/token/%s' % (self.reseller_prefix, token)
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cached_auth_data = memcache_client and memcache_client.get(key)
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if cached_auth_data:
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start, expiration, groups = cached_auth_data
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if time() - start > expiration:
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groups = None
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headers = {}
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if env.get('HTTP_AUTHORIZATION'):
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groups = None
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headers["Authorization"] = env.get('HTTP_AUTHORIZATION')
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if not groups:
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with Timeout(self.timeout):
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conn = http_connect(self.auth_host, self.auth_port, 'GET',
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'%stoken/%s' % (self.auth_prefix, token),
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headers, ssl=self.ssl)
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resp = conn.getresponse()
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resp.read()
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conn.close()
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if resp.status // 100 != 2:
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return None
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expiration = float(resp.getheader('x-auth-ttl'))
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groups = resp.getheader('x-auth-groups')
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if memcache_client:
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memcache_client.set(key, (time(), expiration, groups),
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timeout=expiration)
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if env.get('HTTP_AUTHORIZATION'):
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account, user, sign = \
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env['HTTP_AUTHORIZATION'].split(' ')[-1].split(':')
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cfaccount = resp.getheader('x-auth-account-suffix')
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path = env['PATH_INFO']
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env['PATH_INFO'] = \
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path.replace("%s:%s" % (account, user), cfaccount, 1)
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return groups
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def authorize(self, req):
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"""
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Returns None if the request is authorized to continue or a standard
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WSGI response callable if not.
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"""
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try:
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version, account, container, obj = split_path(req.path, 1, 4, True)
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except ValueError:
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return HTTPNotFound(request=req)
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if not account or not account.startswith(self.reseller_prefix):
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return self.denied_response(req)
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user_groups = (req.remote_user or '').split(',')
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if '.reseller_admin' in user_groups:
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return None
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if account in user_groups and \
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(req.method not in ('DELETE', 'PUT') or container):
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# If the user is admin for the account and is not trying to do an
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# account DELETE or PUT...
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return None
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referrers, groups = parse_acl(getattr(req, 'acl', None))
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if referrer_allowed(req.referer, referrers):
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return None
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if not req.remote_user:
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return self.denied_response(req)
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for user_group in user_groups:
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if user_group in groups:
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return None
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return self.denied_response(req)
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def denied_response(self, req):
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"""
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Returns a standard WSGI response callable with the status of 403 or 401
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depending on whether the REMOTE_USER is set or not.
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"""
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if req.remote_user:
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return HTTPForbidden(request=req)
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else:
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return HTTPUnauthorized(request=req)
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def filter_factory(global_conf, **local_conf):
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"""Returns 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 DevAuth(app, conf)
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return auth_filter
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