o [NSE] Added an Informix library and three scripts that make use of it:

- informix-brute uses the brute framework to perform password guessing
  - informix-query add support for running SQL queries against Informix
  - informix-tables lists table- and column-names for a given database
  [Patrik]

scripts/informix-brute.nse

@@ -0,0 +1,115 @@
+description = [[
+Performs password guessing against 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 Oracle 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 Oracle TNS communication
+	disconnect = function( self )
+		self.helper:Close()
+	end,
+	
+	--- Perform a connection with the helper, this makes sure that the Oracle
+	-- 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