Open Stack

Only admin can perform role assignments so this is not so much as abuse
as putting a safety mechanism in place to help them deal with the
architectural limitations.

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https://bugs.launchpad.net/bugs/1499555

Title:
  You can crash keystone or make the DB very slow by assigning many
  roles

Status in OpenStack Identity (keystone):
  In Progress
Status in OpenStack Security Advisory:
  Incomplete

Bug description:
  This is applicable for UUID and PKI tokens.

  Token table has extra column where we store role information.  It is a
  blob with 64K limit. Basically we can do the following to fill the
  BLOB

     Say user is U, and Project is P
     for i =1  to  1000 ( or any large number)
          role x = create role i  with some large name
          assign role x for user U and Project P
         create a project scoped token for user U

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