summaryrefslogtreecommitdiffstats
path: root/scripts/tso-enum.nse
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--scripts/tso-enum.nse291
1 files changed, 291 insertions, 0 deletions
diff --git a/scripts/tso-enum.nse b/scripts/tso-enum.nse
new file mode 100644
index 0000000..a73adbc
--- /dev/null
+++ b/scripts/tso-enum.nse
@@ -0,0 +1,291 @@
+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 User ID enumerator for IBM mainframes (z/OS). The TSO logon panel
+tells you when a user ID is valid or invalid with the message:
+ <code>IKJ56420I Userid <user ID> not authorized to use TSO</code>.
+
+The TSO logon process can work in two ways:
+1) You get prompted with <code>IKJ56700A ENTER USERID -</code>
+ to which you reply with the user you want to use.
+ If the user ID is valid it will give you a normal
+ TSO logon screen. Otherwise it will give you the
+ screen logon error above.
+2) You're given the TSO logon panel and enter your user ID
+ at the <code>Userid ===></code> prompt. If you give
+ it an invalid user ID you receive the error message above.
+
+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
+]]
+
+---
+-- @args tso-enum.commands Commands in a semi-colon separated list needed
+-- to access TSO. Defaults to <code>tso</code>.
+--
+-- @usage
+-- nmap --script=tso-enum -p 23 <targets>
+--
+-- @usage
+-- nmap -sV -p 9923 10.32.70.10 --script tso-enum --script-args userdb=tso_users.txt,tso-enum.commands="logon applid(tso)"
+--
+-- @output
+-- PORT STATE SERVICE VERSION
+-- 23/tcp open tn3270 IBM Telnet TN3270
+-- | tso-enum:
+-- | TSO User ID:
+-- | TSO User:RAZOR - Valid User ID
+-- | TSO User:BLADE - Valid User ID
+-- | TSO User:PLAGUE - Valid User ID
+-- |_ Statistics: Performed 6 guesses in 3 seconds, average tps: 2
+--
+-- @changelog
+-- 2015-07-04 - v0.1 - created by Soldier of Fortran
+-- 2015-10-30 - v0.2 - streamlined the code, relying on brute and unpwdb and
+-- renamed to tso-enum.
+-- 2017-1-13 - v0.3 - Fixed 'data' bug and added options checking to speedup
+-- 2019-02-01 - v0.4 - Disabled TN3270 Enhanced support and fixed debug errors
+
+
+author = "Philip Young aka Soldier of Fortran"
+license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
+categories = {"intrusive", "brute"}
+
+portrule = shortport.port_or_service({23,992,623}, {"tn3270"})
+
+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()
+ 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:send_pf(3)
+ self.tn3270:disconnect()
+ self.tn3270 = nil
+ return true
+ end,
+ login = function (self, user, pass)
+ -- pass is actually the user id we want to try
+ local commands = self.options['key1']
+ local skip = self.options['skip']
+ stdnse.debug(2,"Getting to TSO")
+ 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 and run[i]:upper():find("LOGON APPLID") and skip then
+ stdnse.verbose(2,"Trying User ID: %s", pass)
+ self.tn3270:send_cursor(run[i] .. " DATA(" .. pass .. ")")
+ elseif i == #run and skip then
+ stdnse.verbose(2,"Trying User ID: %s", pass)
+ self.tn3270:send_cursor(run[i] .. " " .. pass)
+ else
+ self.tn3270:send_cursor(run[i])
+ end
+ self.tn3270:get_all_data()
+ end
+
+ if self.tn3270:find("%*%*%*") then
+ 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("Too many connections")
+ -- 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.verbose(2,"Trying User ID: %s", pass)
+ self.tn3270:send_cursor(pass)
+ self.tn3270:get_all_data()
+ -- some systems require an enter after sending a valid user ID
+ end
+
+ stdnse.debug(2,"Screen Received for User ID: %s", pass)
+ self.tn3270:get_screen_debug(2)
+ if self.tn3270:find('not authorized to use TSO') or
+ self.tn3270:find('IKJ56710I INVALID USERID') then -- invalid user ID
+ return false, brute.Error:new( "Incorrect User ID" )
+ elseif self.tn3270:find('NO USER APPLID AVAILABLE') or self.tn3270:isClear()
+ or not (self.tn3270:find('TSO/E LOGON') or
+ self.tn3270:find("IKJ56710I INVALID USERID")) then
+ -- This error occurs on too many concurrent application requests it
+ -- should be temporary. We use the new setReduce function here to reduce number of connections.
+ local err = brute.Error:new( "TSO Unavailable" )
+ err:setReduce(true)
+ stdnse.debug(1,"TSO Unavailable for UserID %s", pass )
+ return false, err
+ else
+ stdnse.verbose("Valid TSO User ID: %s", string.upper(pass))
+ return true, creds.Account:new("TSO User",string.upper(pass), " Valid User ID")
+ 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-enum.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
+-- TSO is limited to 7 alpha numeric and @, #, $ and can't start with a number
+-- pattern:
+-- ^%D = The first char must NOT be a digit
+-- [%w@#%$] = All letters including the special chars @, #, and $.
+local valid_name = function(x)
+ return (string.len(x) <= 7 and string.match(x,"^%D+[%w@#%$]"))
+end
+
+action = function(host, port)
+ local commands = stdnse.get_script_args(SCRIPT_NAME .. '.commands') or "tso"
+ local tsotst, secprod, err = tso_test(host, port, commands)
+ if tsotst then
+ local options = { key1 = commands, skip = tso_skip(host, port, commands) }
+ stdnse.debug("Starting TSO User ID Enumeration")
+ local engine = brute.Engine:new(Driver, host, port, options)
+ engine.options.script_name = SCRIPT_NAME
+ engine:setPasswordIterator(unpwdb.filter_iterator(brute.usernames_iterator(),valid_name))
+ engine.options.passonly = true
+ engine.options:setTitle("TSO User ID")
+ local status, result = engine:start()
+ port.version.extrainfo = "Security: " .. secprod
+ nmap.set_port_version(host, port)
+ return result
+ else
+ return err
+ end
+
+end
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-12 20:38:58 +0000