I retested and the stacktrace is still there :


2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] ******************** REQUEST ENVIRON ********************
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] SCRIPT_NAME = /v2.0
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] webob.adhoc_attrs = {'response': <Response at 0x24bcd50 200 OK>}
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] REQUEST_METHOD = POST
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] PATH_INFO = /s3tokens
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] SERVER_PROTOCOL = HTTP/1.0
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] CONTENT_LENGTH = 315
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] eventlet.posthooks = []
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] SERVER_NAME = 192.168.244.27
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] REMOTE_ADDR = 192.168.240.13
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] eventlet.input = <eventlet.wsgi.Input object at 0x24bc150>
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] wsgi.url_scheme = http
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] SERVER_PORT = 35357
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] wsgi.input = <_io.BytesIO object at 0x24b1410>
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] HTTP_HOST = 192.168.244.27:35357
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] wsgi.multithread = True
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] openstack.params = {u'credentials': {u'token': u'R0VUCgoKVHVlLCAyNyBNYXIgMjAxMiAxNzoxMzowMSBHTVQKL3Rlc3Qv', u'access': u'a33d3faba9aa46bd813777c7fb06f953', u'host': u'roro-swift:8080', u'verb': u'GET', u'expire': u'Tue, 27 Mar 2012 17:13:01 GMT', u'signature': u'UP9gJ6iN/8/L734jZOq68h698po=', u'path': u'/v1/a33d3faba9aa46bd813777c7fb06f953/test'}}
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] wsgi.version = (1, 0)
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] openstack.context = {'token_id': None, 'is_admin': False}
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] GATEWAY_INTERFACE = CGI/1.1
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] wsgi.run_once = False
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] wsgi.errors = <open file '<stderr>', mode 'w' at 0x7f77e2823270>
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] wsgi.multiprocess = False
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] webob.is_body_seekable = True
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] CONTENT_TYPE = application/json
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] HTTP_ACCEPT_ENCODING = identity
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] 
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] ******************** REQUEST BODY ********************
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] {"credentials": {"host": "roro-swift:8080", "access": "a33d3faba9aa46bd813777c7fb06f953", "token": "R0VUCgoKVHVlLCAyNyBNYXIgMjAxMiAxNzoxMzowMSBHTVQKL3Rlc3Qv", "verb": "GET", "expire": "Tue, 27 Mar 2012 17:13:01 GMT", "signature": "UP9gJ6iN/8/L734jZOq68h698po=", "path": "/v1/a33d3faba9aa46bd813777c7fb06f953/test"}}
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] 
2012-03-27 09:12:31    DEBUG [routes.middleware] Matched POST /s3tokens
2012-03-27 09:12:31    DEBUG [routes.middleware] Route path: '{path_info:.*}', defaults: {'controller': <keystone.contrib.s3.core.S3Extension object at 0x1f25750>}
2012-03-27 09:12:31    DEBUG [routes.middleware] Match dict: {'controller': <keystone.contrib.s3.core.S3Extension object at 0x1f25750>, 'path_info': '/s3tokens'}
2012-03-27 09:12:31    DEBUG [routes.middleware] Matched POST /s3tokens
2012-03-27 09:12:31    DEBUG [routes.middleware] Route path: '/s3tokens', defaults: {'action': u'authenticate', 'controller': <keystone.contrib.s3.core.S3Controller object at 0x1f25850>}
2012-03-27 09:12:31    DEBUG [routes.middleware] Match dict: {'action': u'authenticate', 'controller': <keystone.contrib.s3.core.S3Controller object at 0x1f25850>}
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] arg_dict: {}
2012-03-27 09:12:31    ERROR [root] Not Authorized
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/keystone-2012.2-py2.7.egg/keystone/common/wsgi.py", line 184, in __call__
    result = method(context, **params)
  File "/usr/local/lib/python2.7/dist-packages/keystone-2012.2-py2.7.egg/keystone/contrib/ec2/core.py", line 152, in authenticate
    self.check_signature(creds_ref, credentials)
  File "/usr/local/lib/python2.7/dist-packages/keystone-2012.2-py2.7.egg/keystone/contrib/s3/core.py", line 52, in check_signature
    raise Exception('Not Authorized')
Exception: Not Authorized
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] ******************** RESPONSE HEADERS ********************
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] Content-Type = application/json
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] Vary = X-Auth-Token
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] Content-Length = 158
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] 
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] ******************** RESPONSE BODY ********************
2012-03-27 09:12:31    DEBUG [keystone.common.wsgi] {"error": {"message": "An unexpected error prevented the server from fulfilling your request. Not Authorized", "code": 500, "title": "Internal Server Error"}}
2012-03-27 09:12:31    DEBUG [eventlet.wsgi.server] 192.168.240.13 - - [27/Mar/2012 09:12:31] "POST /v2.0/s3tokens HTTP/1.1" 500 306 0.008177