From 0d47952611198ef6b1163f366dc03922d20b1475 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 09:42:04 +0200 Subject: Adding upstream version 7.94+git20230807.3be01efb1+dfsg. Signed-off-by: Daniel Baumann --- scripts/tso-brute.nse | 368 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 368 insertions(+) create mode 100644 scripts/tso-brute.nse (limited to 'scripts/tso-brute.nse') diff --git a/scripts/tso-brute.nse b/scripts/tso-brute.nse new file mode 100644 index 0000000..ff52c0c --- /dev/null +++ b/scripts/tso-brute.nse @@ -0,0 +1,368 @@ +local stdnse = require "stdnse" +local shortport = require "shortport" +local tn3270 = require "tn3270" +local brute = require "brute" +local creds = require "creds" +local unpwdb = require "unpwdb" +local nmap = require "nmap" +local string = require "string" +local stringaux = require "stringaux" + +description = [[ +TSO account brute forcer. + +This script relies on the NSE TN3270 library which emulates a +TN3270 screen for NMAP. + +TSO user IDs have the following rules: + - it cannot begin with a number + - only contains alpha-numeric characters and @, #, $. + - it cannot be longer than 7 chars +]] + +--- +-- @usage +-- nmap -p 2401 --script tso-brute +-- +-- @output +-- 23/tcp open tn3270 syn-ack IBM Telnet TN3270 +-- | tso-brute: +-- | Node Name: +-- | IBMUSER: - User logged on. Skipped. +-- | ZERO: - User logged on. Skipped. +-- | COOL:secret - Valid credentials +-- |_ Statistics: Performed 6 guesses in 6 seconds, average tps: 1 +-- Final times for host: srtt: 96305 rttvar: 72303 to: 385517 +-- +-- @args tso-brute.commands Commands in a semi-colon separated list needed +-- to access TSO. Defaults to TSO. +-- +-- @args tso-brute.always_logon TSO logon can kick a user off if it guesses +-- the correct password. always_logon, when set to true, will logon, even if +-- the user is logged in (kicking that user off). The default, false will +-- skip that account. +-- +-- @changelog +-- 2015-10-29 - v0.1 - created by Soldier of Fortran +-- +-- @author Philip Young +-- @copyright Same as Nmap--See https://nmap.org/book/man-legal.html +-- + +author = "Soldier of Fortran" +license = "Same as Nmap--See https://nmap.org/book/man-legal.html" +categories = {"intrusive"} + +portrule = shortport.port_or_service({23,992,623}, {"tn3270"}) + +--- Registers User IDs that no longer need to be tested +-- +-- @param username to stop checking +local function register_invalid( username ) + if nmap.registry.tsoinvalid == nil then + nmap.registry.tsoinvalid = {} + end + stdnse.debug(2,"Registering %s", username) + nmap.registry.tsoinvalid[username] = true +end + +Driver = { + new = function(self, host, port, options) + local o = {} + setmetatable(o, self) + self.__index = self + o.host = host + o.port = port + o.options = options + o.tn3270 = tn3270.Telnet:new(brute.new_socket()) + o.tn3270:disable_tn3270e() + return o + end, + connect = function( self ) + local status, err = self.tn3270:initiate(self.host,self.port) + self.tn3270:get_screen_debug(2) + if not status then + stdnse.debug("Could not initiate TN3270: %s", err ) + return false + end + return true + end, + disconnect = function( self ) + self.tn3270:disconnect() + self.tn3270 = nil + return true + end, + login = function (self, user, pass) + + local commands = self.options['key1'] + local always_logon = self.options['key2'] + local skip = self.options['skip'] + stdnse.debug(2,"Getting to TSO") + local run = stringaux.strsplit(";%s*", commands) + stdnse.verbose(2,"Trying User ID/Password: %s/%s", user, pass) + for i = 1, #run do + stdnse.debug(2,"Issuing Command (#%s of %s): %s", i, #run ,run[i]) + if i == #run and run[i]:upper():find("LOGON APPLID") and skip then + stdnse.debug(2,"Trying User ID: %s", user) + self.tn3270:send_cursor(run[i] .. " DATA(" .. user .. ")") + elseif i == #run and skip then + stdnse.debug(2,"Trying User ID: %s", user) + self.tn3270:send_cursor(run[i] .. " " .. user) + else + self.tn3270:send_cursor(run[i]) + end + self.tn3270:get_all_data() + end + + if self.tn3270:find("%*%*%*") then -- For ACF2/TopSecret if required + self.tn3270:send_enter() + self.tn3270:get_all_data() + end + + if not self.tn3270:find("ENTER USERID") + and not self.tn3270:find("TSO/E LOGON") + and not self.tn3270:find("IKJ56710I INVALID USERID") then + local err = brute.Error:new( "TSO Unavailable" ) + -- This error occurs on too many concurrent application requests it + -- should be temporary. We use the new setReduce function. + err:setReduce(true) + stdnse.debug(1,"TSO Unavailable for UserID %s", pass ) + return false, err + end + + if not skip then + stdnse.debug(2,"Trying User ID: %s", user) + self.tn3270:send_cursor(user) + self.tn3270:get_all_data() + end + + + stdnse.debug(2,"Screen Received for User ID: %s", user) + self.tn3270:get_screen_debug(2) + + if not self.tn3270:find('Enter LOGON parameters below') then + stdnse.debug(2,"Screen Received for User ID: %s", user) + self.tn3270:get_screen_debug(2) + -- This error occurs on too many concurrent application requests it + -- should be temporary. We use the new setReduce function. + local err = brute.Error:new( "Not at TSO" ) + err:setReduce(true) + stdnse.debug(1,"TSO Unavailable for UserID %s", pass ) + return false, err + end + + if self.tn3270:find('not authorized to use TSO') then -- invalid user ID + stdnse.debug(2,"Got Message: IKJ56420I Userid %s not authorized to use TSO.", user) + -- Store the invalid ID in the registry so we don't keep trying it with subsequent passwords + -- when using the brute library. + register_invalid(user) + return false, brute.Error:new( "User ID not authorized to use TSO" ) + else + -- It's a valid account so lets try a password + stdnse.debug(2,"%s is a valid TSO User ID. Trying Password: %s", string.upper(user), pass) + if always_logon then + local writeable = self.tn3270:writeable() + -- This turns on the 'reconnect' which may boot users off + self.tn3270:send_locations({{writeable[1][1],pass},{writeable[11][1],"S"}}) + else + self.tn3270:send_cursor(pass) + end + + self.tn3270:get_all_data() + while self.tn3270:isClear() do + -- the screen is blank for a few while it loads TSO + self.tn3270:get_all_data() + end + + stdnse.debug(2,"Screen Received for User/Pass: %s/%s", user, pass) + self.tn3270:get_screen_debug(2) + + if not always_logon and self.tn3270:find("already logged on") then + -- IKJ56425I LOGON rejected User already logged on to system + register_invalid(user) + return true, creds.Account:new(user, "", "User logged on. Skipped.") + elseif (self.tn3270:find("IKJ56425I") and self.tn3270:find("IKJ56418I")) then + -- IKJ56425I LOGON REJECTED, RACF® TEMPORARILY REVOKING USER ACCESS + -- IKJ56418I CONTACT YOUR TSO ADMINISTRATOR + -- The first message (5I) is always followed by the second if the account it revoked + -- But not followed by the second message if its just logged on already + register_invalid(user) -- We dont want to keep generating errors + stdnse.verbose(3,"User: " .. user .. " LOCKED OUT") + return false, brute.Error:new("Account Locked out") + elseif not (self.tn3270:find("IKJ56421I") or + self.tn3270:find("IKJ56443I") or + self.tn3270:find("TSS7101E") or + self.tn3270:find("TSS714[0-3]E") or + self.tn3270:find("TSS7099E") or + self.tn3270:find("TSS7120E")) then + -- RACF: + -- IKJ56421I PASSWORD NOT AUTHORIZED FOR USERID + -- IKJ56443I TSOLOGON RECONNECT REJECTED - USER ACCESS REVOKED BY RACF + + -- Top Secret: + -- TSS7101E Password is Incorrect + -- TSS7140E Accessor ID Has Expired: No Longer Valid + -- TSS7141E Use of Accessor ID Suspended + -- TSS7142E Accessor ID Not Yet Available for Use - Still Inactive + -- TSS7143E Accessor ID Has Been Inactive Too Long + -- TSS7120E PASSWORD VIOLATION THRESHOLD EXCEEDED + -- TSS7099E Signon credentials invalid + + -- The 'MSG allows testers to discern any relevant messages they may get for the account' + stdnse.verbose(2,"Valid User/Pass: " .. user .. "/" .. pass) + stdnse.verbose(3,"Valid MSG for " .. user .. "/" .. pass .. ": " .. self.tn3270:get_screen():sub(1,80)) + return true, creds.Account:new(user, pass, creds.State.VALID) + else + return false, brute.Error:new( "Incorrect password" ) + end + end + end +} + +--- Tests the target to see if we can even get to TSO +-- +-- @param host host NSE object +-- @param port port NSE object +-- @param commands script-args of commands to use to get to TSO +-- @return status true on success, false on failure +-- @return name of security product installed +local function tso_test( host, port, commands ) + stdnse.debug("Checking for TSO") + local tn = tn3270.Telnet:new() + tn:disable_tn3270e() + local status, err = tn:initiate(host,port) + local tso = false -- initially we're not at TSO logon panel + local secprod = "RACF" + tn:get_screen_debug(2) -- prints TN3270 screen to debug + if not status then + stdnse.debug("Could not initiate TN3270: %s", err ) + return tso, "Could not Initiate TN3270" + end + local run = stringaux.strsplit(";%s*", commands) + for i = 1, #run do + stdnse.debug(2,"Issuing Command (#%s of %s): %s", i, #run ,run[i]) + tn:send_cursor(run[i]) + tn:get_all_data() + end + tn:get_screen_debug(2) + + if tn:find("***") then + secprod = "TopSecret/ACF2" + end + + if tn:find("ENTER USERID") or tn:find("TSO/E LOGON") then + tso = true + -- Patch OA44855 removed the ability to enumerate users + tn:send_cursor("notreal") + tn:get_all_data() + if tn:find("IKJ56476I ENTER PASSWORD") then + return false, secprod, "Enumeration is not possible. PASSWORDPREPROMPT is set to ON." + end + end + tn:send_pf(3) + tn:disconnect() + return tso, secprod, "Could not get to TSO. Try --script-args=tso-brute.commands='logon applid(tso)'. Aborting." +end + +--- Tests the target to see if we can speed up brute forcing +-- VTAM/USSTable will sometimes allow you to put the userid +-- in the command area either through data() or just adding +-- the userid. This function will test for both +-- +-- @param host host NSE object +-- @param port port NSE object +-- @param commands script-args of commands to use to get to TSO +-- @return status true on success, false on failure +local function tso_skip( host, port, commands ) + stdnse.debug("Checking for IKJ56700A message skip") + local tn = tn3270.Telnet:new() + tn:disable_tn3270e() + stdnse.debug2("Connecting TN3270 to %s:%s", host.targetname or host.ip, port.number) + local status, err = tn:initiate(host,port) + stdnse.debug2("Displaying initial TN3270 Screen:") + tn:get_screen_debug(2) -- prints TN3270 screen to debug + if not status then + stdnse.debug("Could not initiate TN3270: %s", err ) + return false + end + -- We're connected now to test. + local data = false + if commands:upper():find('LOGON APPLID') then + stdnse.debug(2,"Using LOGON command (%s) trying DATA() command", commands ) + data = true + else + stdnse.debug(2,"Not using LOGON command, testing adding userid to command" ) + end + + local run = stringaux.strsplit(";%s*", commands) + for i = 1, #run do + stdnse.debug(2,"Issuing Command (#%s of %s): %s", i, #run ,run[i]) + if i == #run then + if data then + stdnse.debug(2,"Sending "..run[i].." DATA(FAKEUSER)") + tn:send_cursor(run[i].." DATA(FAKEUSER)") + else + stdnse.debug(2,"Sending "..run[i].." FAKEUSER") + tn:send_cursor(run[i].." FAKEUSER") + end + else + tn:send_cursor(run[i]) + end + tn:get_all_data() + end + tn:get_screen_debug(2) + + if tn:find("IKJ56710I INVALID USERID") or + tn:find("Enter LOGON parameters below") then + stdnse.debug('IKJ56700A message skip supported') + return true + else + return false + end +end + +-- Filter iterator for unpwdb usernames +-- TSO is limited to 7 alpha numeric and @, #, $ and can't start with a number +-- If this user ID has been confirmed to not be a valid TSO account +-- it will stop being passed to the brute engine +-- pattern: +-- ^%D = The first char must NOT be a digit +-- [%w@#%$] = All letters including the special chars @, #, and $. +local valid_name = function(x) + if nmap.registry.tsoinvalid and nmap.registry.tsoinvalid[x] then + return false + else + return (string.len(x) <= 7 and string.match(x,"^%D+[%w@#%$]")) + end +end + +-- Checks string to see if it follows valid password limitations +local valid_pass = function(x) + local patt = "[%w@#%$]" + return (string.len(x) <= 8 and string.match(x,patt)) +end + +action = function( host, port ) + local status, result + local commands = stdnse.get_script_args(SCRIPT_NAME .. '.commands') or "tso" + -- if a user is logged on this script will not try to logon as that user + -- because a user is only allowed to logon from one location. If you turn always_logon on + -- it will logon if it finds a valid username/password, kicking that user off + local always_logon = stdnse.get_script_args(SCRIPT_NAME .. '.always_logon') or false + local tsotst, secprod, err = tso_test(host, port, commands) + if tsotst then + stdnse.debug("Starting TSO Brute Force") + local options = { key1 = commands, key2 = always_logon, skip = tso_skip(host, port, commands) } + local engine = brute.Engine:new(Driver, host, port, options) + -- TSO has username/password restrictions. + -- This sets the iterators to use only valid TSO userids/passwords + engine:setUsernameIterator(unpwdb.filter_iterator(brute.usernames_iterator(),valid_name)) + engine:setPasswordIterator(unpwdb.filter_iterator(brute.passwords_iterator(),valid_pass)) + engine.options.script_name = SCRIPT_NAME + engine.options:setTitle("TSO Accounts") + status, result = engine:start() + return result + else + return err + end +end -- cgit v1.2.3