Open Stack

There should probably be an OSSN highlighting that rate limiting exists
and pointing to the correct configurations. It can also mention that
there was a problem with some versions of the code, linking to this bug.

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https://bugs.launchpad.net/bugs/1210869

Title:
  Ratelimiting not working

Status in OpenStack Compute (Nova):
  Fix Committed
Status in OpenStack Security Advisories:
  Invalid

Bug description:
  Current master does not respect ratelimiting, since parsing of the  api-paste.ini is faulty. api-paste.ini configues user limiting by
  setting a line as follows (according to the code and unit test):
      
  user:<user-id>:(GET, *, ".*", 4, minute)
      
  This was passed to the Limiter as kwargs with "user" as a key.
  Thus multiple user limiting is not possible as well as extracting
  the id of the user was bound to fail, since we checked on the key
  with startswith("user:")
     
  An example config in the api-paste.ini has to look as follows:
  limits = (POST, "*", .*, 10, MINUTE)
  limits.<user-id1>:(GET, "*", .*, 4, minute)
  limits.<user-id2>:(GET, "*", .*, 2, minute)

  This can  be then tested by maybe trying to run "cinder list" with a
  configures user and see if the limit is respected.

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