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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--- -- Common communication functions for network discovery tasks like -- banner grabbing and data exchange. -- -- The functions in this module return values appropriate for use with -- exception handling via nmap.new_try. -- -- These functions may be passed a table of options, but it's not required. The -- keys for the options table are: -- * bytes - minimum number of bytes to read. -- * lines - minimum number of lines to read. -- * proto - string, protocol to use. Default "tcp" -- * timeout - override timeout in milliseconds. This overrides all other timeout defaults, but can be overridden by specific connect and request timeouts (below) -- * connect_timeout - socket timeout for connection. Default: same as stdnse.get_timeout -- * request_timeout - additional socket timeout for requests. This is added to the connect_timeout to get a total time for a request to receive a response. Default: 6000ms -- * recv_before - boolean, receive data before sending first payload -- * any_af - boolean, allow connecting to any address family, inet or inet6. By default, these functions will only use the same AF as nmap.address_family to resolve names. -- -- If both "bytes" and "lines" are provided, -- "lines" takes precedence. If neither are given, the functions -- read as many bytes as possible. -- @author Kris Katterjohn 04/2008 -- @copyright Same as Nmap--See https://nmap.org/book/man-legal.html local nmap = require "nmap" local shortport local stdnse = require "stdnse" local oops = require "oops" _ENV = stdnse.module("comm", stdnse.seeall) -- This timeout value (in ms) is added to the connect timeout and represents -- the amount of processing time allowed for the host before it sends a packet. -- For justification of this value, see totalwaitms in nmap-service-probes local REQUEST_TIMEOUT = 6000 -- Function used to get a connect and request timeout based on specified options local function get_timeouts(host, opts) local connect_timeout, request_timeout -- connect_timeout based on options or stdnse.get_timeout() if opts and opts.connect_timeout then connect_timeout = opts.connect_timeout elseif opts and opts.timeout then connect_timeout = opts.timeout else connect_timeout = stdnse.get_timeout(host) end -- request_timeout based on options or REQUEST_TIMEOUT + connect_timeout if opts and opts.request_timeout then request_timeout = opts.request_timeout elseif opts and opts.timeout then request_timeout = opts.timeout else request_timeout = REQUEST_TIMEOUT end request_timeout = request_timeout + connect_timeout return connect_timeout, request_timeout end -- Sets up the socket and connects to host:port local setup_connect = function(host, port, opts) local sock = nmap.new_socket() local connect_timeout, request_timeout = get_timeouts(host, opts) sock:set_timeout(connect_timeout) if type(host) == "string" and opts.any_af then local status, addrs = nmap.resolve(host) if status then host = {ip = addrs[1], targetname = host} end end local status, err = sock:connect(host, port, opts.proto) if not status then sock:close() return oops.raise("Could not connect", status, err) end sock:set_timeout(request_timeout) return true, sock end local read = function(sock, opts) if opts.lines then return oops.raise("receive_lines failed", sock:receive_lines(opts.lines)) end if opts.bytes then return oops.raise("receive_bytes failed", sock:receive_bytes(opts.bytes)) end return oops.raise("receive failed", sock:receive()) end --- This function simply connects to the specified port number on the -- specified host and returns any data received. -- -- The first return value is true to signal success or false to signal -- failure. On success the second return value is the response from the -- remote host. On failure the second return value is an error message. -- @param host The host to connect to. -- @param port The port on the host. -- @param opts The options. See the module description. -- @return Status (true or false). -- @return Data (if status is true) or error string (if status is false). get_banner = function(host, port, opts) opts = opts or {} opts.recv_before = true local socket, errmsg, correct, banner = oops.raise("tryssl failed", tryssl(host, port, nil, opts)) if socket then socket:close() return true, banner end return false, errmsg end --- This function connects to the specified port number on the specified -- host, sends data, then waits for and returns the response, if any. -- -- The first return value is true to signal success or false to signal -- failure. On success the second return value is the response from the -- remote host. On failure the second return value is an error message. -- @param host The host to connect to. -- @param port The port on the host. -- @param data The data to send initially. -- @param opts The options. See the module description. -- @return Status (true or false). -- @return Data (if status is true) or error string (if status is false). exchange = function(host, port, data, opts) opts = opts or {} local status, sock = setup_connect(host, port, opts) local ret if not status then -- sock is an error message in this case return oops.raise("Failed to connect", status, sock) end status, ret = sock:send(data) if not status then sock:close() return oops.raise("Failed to send", status, ret) end status, ret = read(sock, opts) sock:close() return oops.raise("Failed to read", status, ret) end --- This function uses shortport.ssl to check if the port is a likely SSL port -- @see shortport.ssl -- -- @param port The port table to check -- @return bool True if port is usually ssl, otherwise false local function is_ssl(port) shortport = shortport or require "shortport" return shortport.ssl(nil, port) end --- This function returns best protocol order for trying to open a -- connection based on port and service information -- -- The first value is the best option, the second is the worst -- @param port The port table -- @return Best option ("tcp" or "ssl") -- @return Worst option ("tcp" or "ssl") local function bestoption(port) if type(port) == 'table' then if port.protocol == "udp" then stdnse.debug2("DTLS (SSL over UDP) is not supported") return "udp", "udp" end if port.version and port.version.service_tunnel and port.version.service_tunnel == "ssl" then return "ssl","tcp" end if port.version and port.version.name_confidence and port.version.name_confidence > 6 then return "tcp","ssl" end local _port = { number = port.number, service = port.service, protocol = port.protocol or "tcp", state = port.state or "open", version = port.version } if is_ssl(_port) then return "ssl","tcp" end elseif type(port) == 'number' then if is_ssl({number=port, protocol="tcp", state="open"}) then return "ssl","tcp" end end return "tcp","ssl" end --- This function opens a connection, sends the first data payload and -- check if a response is correctly received (what means that the -- protocol used is fine) -- -- Possible options: -- timeout, connect_timeout, request_timeout: See module documentation -- recv_before: receive data before sending first payload -- proto: the protocol to use ("tcp", "udp", or "ssl") -- -- @param host The destination host IP -- @param port The destination host port -- @param data The first data payload of the connection -- @param opts An options table -- @return sd The socket descriptor, nil if no connection is established -- @return response The response received for the payload, or an error message -- @return early_resp If opt recv_before is true, returns the value -- of the first receive (before sending data) function opencon(host, port, data, opts) opts = opts or {} local status, sd = setup_connect(host, port, opts) if not status then return oops.raise("Failed to connect", false, sd) end local response, early_resp if opts.recv_before then status, early_resp = oops.raise("read failed", read(sd, opts)) end if data and #data > 0 then sd:send(data) status, response = oops.raise("receive failed", sd:receive()) else response = early_resp end if not status then sd:close() end return status and sd, response, early_resp end --- Opens a SSL connection if possible, with fallback to plain text. -- -- For likely-SSL services (as determined by shortport.ssl), SSL -- is tried first. For UDP services, only plain text is currently supported. -- -- Either data or opts.recv_before is required: -- -- * If the service sends a banner first, use opts.recv_before -- * If the service waits for client data first, provide that via data. -- * If you provide neither, then a service that waits for client data will -- only work with SSL and a service that sends a banner first will require you -- to do a read to get that banner. -- -- @param host The host table -- @param port The port table -- @param data The first data payload of the connection. Optional if -- opts.recv_before is true. -- @param opts Options, such as timeout -- @return sd The socket descriptor, or nil on error -- @return response The response received for the payload, or an error message -- @return correctOpt Correct option for connection guess -- @return earlyResp If opt recv_before is true, returns the value -- of the first receive (before sending data) function tryssl(host, port, data, opts) opts = opts or {} if not data and not opts.recv_before then stdnse.debug1( "Using comm.tryssl without either first data payload or opts.recv_before.\n\z Impossible to test the connection for the correct protocol!" ) end local opt1, opt2 = bestoption(port) local best = opt1 if opts.proto=="udp" then stdnse.debug2("DTLS (SSL over UDP) is not supported") end opts.proto = opt1 local sd, response, early_resp = oops.raise(("%s failed"):format(opt1), opencon(host, port, data, opts)) -- Try the second option (If udp, then both options are the same; skip it) if not sd and opt1 ~= "udp" then opts.proto = opt2 sd, response, early_resp = oops.raise(("%s failed"):format(opt2), opencon(host, port, data, opts)) best = opt2 end if not sd then best = "none" end return sd, response, best, early_resp end local unittest = require "unittest" if not unittest.testing() then return _ENV end test_suite = unittest.TestSuite:new() test_suite:add_test(unittest.table_equal({bestoption(443)}, {"ssl", "tcp"}), "bestoption ssl number") test_suite:add_test(unittest.table_equal({bestoption(80)}, {"tcp", "ssl"}), "bestoption tcp number") test_suite:add_test(unittest.table_equal({bestoption({number=8443,protocol="tcp",state="open"})}, {"ssl", "tcp"}), "bestoption ssl table") test_suite:add_test(unittest.table_equal({bestoption({number=1234,protocol="tcp",state="open"})}, {"tcp", "ssl"}), "bestoption tcp table") return _ENV;