local brute = require "brute" local coroutine = require "coroutine" local creds = require "creds" local imap = require "imap" local shortport = require "shortport" local stdnse = require "stdnse" description = [[ Performs brute force password auditing against IMAP servers using either LOGIN, PLAIN, CRAM-MD5, DIGEST-MD5 or NTLM authentication. ]] --- -- @usage -- nmap -p 143,993 --script imap-brute -- -- @output -- PORT STATE SERVICE REASON -- 143/tcp open imap syn-ack -- | imap-brute: -- | Accounts -- | braddock:jules - Valid credentials -- | lane:sniper - Valid credentials -- | parker:scorpio - Valid credentials -- | Statistics -- |_ Performed 62 guesses in 10 seconds, average tps: 6 -- -- @args imap-brute.auth authentication mechanism to use LOGIN, PLAIN, -- CRAM-MD5, DIGEST-MD5 or NTLM -- Version 0.1 -- Created 07/15/2011 - v0.1 - created by Patrik Karlsson author = "Patrik Karlsson" license = "Same as Nmap--See https://nmap.org/book/man-legal.html" categories = {"brute", "intrusive"} portrule = shortport.port_or_service({143,993}, {"imap","imaps"}) local mech -- By using this connectionpool we don't need to reconnect the socket -- for each attempt. ConnectionPool = {} Driver = { -- Creates a new driver instance -- @param host table as received by the action method -- @param port table as received by the action method -- @param pool an instance of the ConnectionPool new = function(self, host, port, pool) local o = { host = host, port = port } setmetatable(o, self) self.__index = self return o end, -- Connects to the server (retrieves a connection from the pool) connect = function( self ) self.helper = ConnectionPool[coroutine.running()] if ( not(self.helper) ) then self.helper = imap.Helper:new( self.host, self.port ) self.helper:connect() ConnectionPool[coroutine.running()] = self.helper end return true end, -- Attempts to login to the server -- @param username string containing the username -- @param password string containing the password -- @return status true on success, false on failure -- @return brute.Error on failure and creds.Account on success login = function( self, username, password ) local status, err = self.helper:login( username, password, mech ) if ( status ) then self.helper:close() self.helper:connect() return true, creds.Account:new(username, password, creds.State.VALID) end if ( err:match("^ERROR: Failed to .* data$") ) then self.helper:close() self.helper:connect() local err = brute.Error:new( err ) -- This might be temporary, set the retry flag err:setRetry( true ) return false, err end return false, brute.Error:new( "Incorrect password" ) end, -- Disconnects from the server (release the connection object back to -- the pool) disconnect = function( self ) return true end, } local function fail (err) return stdnse.format_output(false, err) end action = function(host, port) -- Connects to the server and retrieves the capabilities so that -- authentication mechanisms can be determined local helper = imap.Helper:new(host, port) local status = helper:connect() if (not(status)) then return fail("Failed to connect to the server.") end local status, capabilities = helper:capabilities() if (not(status)) then return fail("Failed to retrieve capabilities.") end -- check if an authentication mechanism was provided or try -- try them in the mech_prio order local mech_prio = stdnse.get_script_args("imap-brute.auth") mech_prio = ( mech_prio and { mech_prio } ) or { "LOGIN", "PLAIN", "CRAM-MD5", "DIGEST-MD5", "NTLM" } -- iterates over auth mechanisms until a valid mechanism is found for _, m in ipairs(mech_prio) do if ( m == "LOGIN" and not(capabilities.LOGINDISABLED)) then mech = "LOGIN" break elseif ( capabilities["AUTH=" .. m] ) then mech = m break end end -- if no mechanisms were found, abort if ( not(mech) ) then return fail("No suitable authentication mechanism was found") end local engine = brute.Engine:new(Driver, host, port) engine.options.script_name = SCRIPT_NAME local result status, result = engine:start() for _, helper in pairs(ConnectionPool) do helper:close() end return result end