local brute = require "brute"
local creds = require "creds"
local rpcap = require "rpcap"
local shortport = require "shortport"

description = [[
Performs brute force password auditing against the WinPcap Remote Capture
Daemon (rpcap).
]]

---
-- @usage
-- nmap -p 2002 <ip> --script rpcap-brute
--
-- @output
-- PORT     STATE SERVICE REASON
-- 2002/tcp open  globe   syn-ack
-- | rpcap-brute: 
-- |   Accounts
-- |     monkey:Password1 - Valid credentials
-- |   Statistics
-- |_    Performed 3540 guesses in 3 seconds, average tps: 1180
--
--


author = "Patrik Karlsson"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"intrusive", "brute"}

portrule = shortport.port_or_service(2002, "rpcap", "tcp")

Driver = {
	
	new = function(self, host, port)
		local o = { helper = rpcap.Helper:new(host, port) }
		setmetatable(o, self)
		self.__index = self
		return o
	end,
	
	connect = function(self)
		return self.helper:connect()
	end,
	
	login = function(self, username, password)
		local status, resp = self.helper:login(username, password)
		if ( status ) then
			return true, brute.Account:new(username, password, creds.State.VALID)
		end
		return false, brute.Error:new( "Incorrect password" )
	end,
       	
	disconnect = function(self)
		return self.helper:close()
	end,
		
}

local function validateAuth(host, port)
	local helper = rpcap.Helper:new(host, port)
	local status, result = helper:connect()
	if ( not(status) ) then
		return false, result
	end
	status, result = helper:login()
	helper:close()
	
	if ( status ) then
		return false, "Authentication not required"
	elseif ( not(status) and
		"Authentication failed; NULL autentication not permitted." == result ) then
		return true
	end
	return status, result
end

action = function(host, port)

	local status, result = validateAuth(host, port)
	if ( not(status) ) then
		return result
	end	
	
	local engine = brute.Engine:new(Driver, host, port )
	
	engine.options.script_name = SCRIPT_NAME
	engine.options.firstonly = true
	status, result = engine:start()

	return result
end