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description = [[
Performs brute force password auditing against IBM Informix Dynamic Server.
]]

---
-- @usage
-- nmap --script informix-brute -p 9088 <host>
--
-- @output
-- PORT     STATE SERVICE
-- 9088/tcp open  unknown
-- | informix-brute:  
-- |   Accounts
-- |     ifxnoob:ifxnoob => Login correct
-- |   Statistics
-- |_    Perfomed 25024 guesses in 75 seconds, average tps: 320
--
-- Summary
-- -------
--   x The Driver class contains the driver implementation used by the brute
--     library
--

--
-- Version 0.1
-- Created 07/23/2010 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
--

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

require 'shortport'
require 'brute'
require 'informix'

portrule = shortport.port_or_service( { 1526, 9088, 9090, 9092 }, "informix", "tcp", "open") 

Driver = 
{

	new = function(self, host, port)
		local o = {}
       	setmetatable(o, self)
        self.__index = self
		o.host = host
		o.port = port
		return o
	end,
	
	--- Connects performs protocol negotiation
	--
	-- @return true on success, false on failure
	connect = function( self )
		local status, data 
		self.helper = informix.Helper:new( self.host, self.port, "on_nmap_dummy" )
		
		status, data = self.helper:Connect()
		if ( not(status) ) then
			return status, data
		end
		
		return true
	end,
	
	--- Attempts to login to the Informix server
	--
	-- @param username string containing the login username
	-- @param password string containing the login password
	-- @return status, true on success, false on failure
	-- @return brute.Error object on failure
	--         brute.Account object on success
	login = function( self, username, password )
		local status, data = self.helper:Login( username, password, {} )
		
		if ( status ) then
			if ( not(nmap.registry['informix-brute']) ) then
				nmap.registry['informix-brute'] = {}
			end
			table.insert( nmap.registry['informix-brute'], { ["username"] = username, ["password"] = password } )
			return true, brute.Account:new(username, password, "OPEN")
		-- Check for account locked message
		elseif ( data:match("INFORMIXSERVER does not match either DBSERVERNAME or DBSERVERALIASES") ) then
			return true, brute.Account:new(username, password, "OPEN")
		end

		return false, brute.Error:new( data )

	end,
	
	--- Disconnects and terminates the Informix communication
	disconnect = function( self )
		self.helper:Close()
	end,
	
	--- Perform a connection with the helper, this makes sure that the Informix
	-- instance is correct.
	--
	-- @return status true on success false on failure
	-- @return err containing the error message on failure
	check = function( self )
		return true
	end,
	
}


action = function(host, port)
	local status, result 
	local engine = brute.Engine:new(Driver, host, port )
	
	status, result = engine:start()

	return result
end

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