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Þ'¯°ÌME[YéïĵÂCå½ Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢ Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ] R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß ¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8 CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ àfPìð .wFšir´þ’2_Y *Æ€x\« ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1 2Ž‰$€$I$#‰SÞ’Hë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙ--- -- A library that implements the basics of the STUN protocol (Session -- Traversal Utilities for NAT) per RFC3489 and RFC5389. A protocol -- overview is available at http://en.wikipedia.org/wiki/STUN. -- -- @args stun.mode Mode container to use. Supported containers: "modern" -- (default) or "classic" -- -- @author Patrik Karlsson -- local ipOps = require "ipOps" local match = require "match" local rand = require "rand" local nmap = require "nmap" local stdnse = require "stdnse" local string = require "string" local table = require "table" _ENV = stdnse.module("stun", stdnse.seeall) -- The supported request types MessageType = { BINDING_REQUEST = 0x0001, BINDING_RESPONSE = 0x0101, } -- The header used in both request and responses Header = { -- the header size in bytes size = 20, --- creates a new instance of Header -- @param type number the request/response type -- @param trans_id string the 128-bit transaction id -- @param length number the packet length -- @return new instance of Header -- @name Header.new new = function(self, type, trans_id, length) local o = { type = type, trans_id = trans_id, length = length or 0 } setmetatable(o, self) self.__index = self return o end, --- parses an opaque string and creates a new Header instance -- @param data opaque string -- @return new instance of Header -- @name Header.parse parse = function(data) local header = Header:new() header.type, header.length, header.trans_id = string.unpack(">I2I2 c16", data) return header end, -- converts the header to an opaque string -- @return string containing the header instance __tostring = function(self) return string.pack(">I2I2", self.type, self.length) .. self.trans_id end, } Request = { -- The binding request Bind = { --- Creates a new Bind request -- @param trans_id string containing the 128 bit transaction ID -- @return new instance of the Bind request -- @name Request.Bind.new new = function(self, trans_id) local o = { header = Header:new(MessageType.BINDING_REQUEST, trans_id), attributes = {} } setmetatable(o, self) self.__index = self return o end, -- converts the instance to an opaque string -- @return string containing the Bind request as string __tostring = function(self) local data = "" for _, attrib in ipairs(self.attributes) do data = data .. tostring(attrib) end self.header.length = #data return tostring(self.header) .. data end, } } -- The attribute class Attribute = { MAPPED_ADDRESS = 0x0001, RESPONSE_ADDRESS = 0x0002, CHANGE_REQUEST = 0x0003, SOURCE_ADDRESS = 0x0004, CHANGED_ADDRESS = 0x0005, USERNAME = 0x0006, PASSWORD = 0x0007, MESSAGE_INTEGRITY = 0x0008, ERROR_CODE = 0x0009, UNKNOWN_ATTRIBUTES = 0x000a, REFLECTED_FROM = 0x000b, SERVER = 0x8022, --- creates a new attribute instance -- @param type number containing the attribute type -- @param data string containing the attribute value -- @return instance of attribute -- @name Attribute.new new = function(self, type, data) local o = { type = type, length = (data and #data or 0), data = data, } setmetatable(o, self) self.__index = self return o end, --- parses a string and creates an Attribute instance -- @param data string containing the raw attribute -- @return new attribute instance -- @name Attribute.parse parse = function(data) local attr = Attribute:new() local pos = 1 attr.type, attr.length, pos = string.unpack(">I2I2", data, pos) local function parseAddress(data, pos) local addr = {} addr.family, addr.port, addr.ip, pos = string.unpack(">xBI2c4", data, pos) addr.ip = ipOps.str_to_ip(addr.ip) return addr end if ( ( attr.type == Attribute.MAPPED_ADDRESS ) or ( attr.type == Attribute.RESPONSE_ADDRESS ) or ( attr.type == Attribute.SOURCE_ADDRESS ) or ( attr.type == Attribute.CHANGED_ADDRESS ) ) then if ( attr.length ~= 8 ) then stdnse.debug2("Incorrect attribute length") end attr.addr = parseAddress(data, pos) elseif( attr.type == Attribute.SERVER ) then attr.server = data:sub(pos, pos + attr.length - 1) end return attr end, -- converts an attribute to string -- @return string containing the serialized attribute __tostring = function(self) return string.pack(">I2I2", self.type, self.length) .. (self.data or "") end, } -- Response class container Response = { -- Bind response class Bind = { --- creates a new instance of the Bind response -- @param trans_id string containing the 128 bit transaction id -- @return new Bind instance -- @name Response.Bind.new new = function(self, trans_id) local o = { header = Header:new(MessageType.BINDING_RESPONSE, trans_id) } setmetatable(o, self) self.__index = self return o end, --- parses a raw string and creates a new Bind instance -- @param data string containing the raw data -- @return a new Bind instance -- @name Response.Bind.parse parse = function(data) local resp = Response.Bind:new() local pos = Header.size + 1 resp.header = Header.parse(data) resp.attributes = {} while( pos < #data ) do local attr = Attribute.parse(data:sub(pos)) table.insert(resp.attributes, attr) pos = pos + attr.length + 4 end return resp end } } -- The communication class Comm = { --- creates a new Comm instance -- @param host table -- @param port table -- @param options table, currently supporting: -- timeout - socket timeout in ms. -- @return new instance of Comm -- @name Comm.new new = function(self, host, port, options) local o = { host = host, port = port, options = options or { timeout = 10000 }, socket = nmap.new_socket(), } setmetatable(o, self) self.__index = self return o end, --- connects the socket to the server -- @return status true on success, false on failure -- @return err string containing an error message, if status is false -- @name Comm.connect connect = function(self) self.socket:set_timeout(self.options.timeout) return self.socket:connect(self.host, self.port) end, --- sends a request to the server -- @return status true on success, false on failure -- @return err string containing an error message, if status is false -- @name Comm.send send = function(self, data) return self.socket:send(data) end, --- receives a response from the server -- @return status true on success, false on failure -- @return response containing a response instance, or -- err string containing an error message, if status is false -- @name Comm.recv recv = function(self) local status, hdr_data = self.socket:receive_buf(match.numbytes(Header.size), true) if ( not(status) ) then return false, "Failed to receive response from server" end local header = Header.parse(hdr_data) if ( not(header) ) then return false, "Failed to parse response header" end local status, data = self.socket:receive_buf(match.numbytes(header.length), true) if ( header.type == MessageType.BINDING_RESPONSE ) then local resp = Response.Bind.parse(hdr_data .. data) return true, resp end return false, "Unknown response message received" end, --- sends the request instance to the server and receives the response -- @param req request class instance -- @return status true on success, false on failure -- @return response containing a response instance, or -- err string containing an error message, if status is false -- @name Comm.exch exch = function(self, req) local status, err = self:send(tostring(req)) if ( not(status) ) then return false, "Failed to send request to server" end return self:recv() end, --- closes the connection to the server -- @return status true on success, false on failure -- @return err string containing an error message, if status is false -- @name Comm.close close = function(self) self.socket:close() end, } -- The Helper class Helper = { --- creates a new Helper instance -- @param host table -- @param port table -- @param options table, currently supporting: -- timeout - socket timeout in ms. -- @param mode containing the mode container. Supported containers: "modern" -- (default) or "classic" -- @return o new instance of Helper -- @name Helper.new new = function(self, host, port, options, mode) local o = { mode = mode or stdnse.get_script_args("stun.mode") or "modern", comm = Comm:new(host, port, options), } assert(o.mode == "modern" or o.mode == "classic", "Unsupported mode") setmetatable(o, self) self.__index = self return o end, --- connects to the server -- @return status true on success, false on failure -- @return err string containing an error message, if status is false -- @name Helper.connect connect = function(self) return self.comm:connect() end, --- Gets the external public IP -- @return status true on success, false on failure -- @return result containing the IP as string -- @name Helper.getExternalAddress getExternalAddress = function(self) local trans_id if ( self.mode == "classic" ) then trans_id = rand.random_string(16) else trans_id = "\x21\x12\xA4\x42" .. rand.random_string(12) end local req = Request.Bind:new(trans_id) local status, response = self.comm:exch(req) if ( not(status) ) then return false, "Failed to send data to server" end local result for k, attr in pairs(response.attributes) do if (attr.type == Attribute.MAPPED_ADDRESS ) then result = ( attr.addr and attr.addr.ip or "" ) end if ( attr.type == Attribute.SERVER ) then self.cache = self.cache or {} self.cache.server = attr.server end end if ( not(result) and not(self.cache) ) then return false, "Server returned no response" end return status, result end, --- Gets the server version if it was returned by the server -- @return status true on success, false on failure -- @return version string containing the server product and version -- @name Helper.getVersion getVersion = function(self) local status, response = false, nil -- check if the server version was cached if ( not(self.cache) or not(self.cache.version) ) then local status, response = self:getExternalAddress() if ( status ) then return true, (self.cache and self.cache.server or "") end return false, response end return true, (self.cache and self.cache.server or "") end, --- closes the connection to the server -- @return status true on success, false on failure -- @return err string containing an error message, if status is false -- @name Helper.close close = function(self) return self.comm:close() end, } return _ENV;