Open Stack

@Thierry, the difference that I see between many authentication requests
versus one request with many authentication methods, is that in the
first case an operator may limit the rate at which requests are
processed, but it's more difficult to protect Keystone against few
requests triggering many authentication trials.

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https://bugs.launchpad.net/bugs/1300274

Title:
  V3 Authentication Chaining - uniqueness of auth method names

Status in OpenStack Identity (Keystone):
  In Progress
Status in OpenStack Security Advisories:
  Incomplete

Bug description:
  In V3.0 API,  we can chain authentication methods. An attacker can
  place the same authentication method multiple times in the methods
  filed. This will result in the same authentication method checking
  over and over (for loop in code).  Using this, an attacker can achieve
  some sorts of Denial of Service.   The methods field is not properly
  sanitized.

  {
     "auth":{
        "identity":{
           "methods":[
              "password",
              "password",
               "password",
               "password",
               "password" 
           ],
          "password":{
              "user":{
                 "domain":{
                    "id":"default"
                 },
                 "name":"demo",
                 "password":"stack"
              }
           }
        }
     }
  }

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