141 lines
4.2 KiB
Lua
141 lines
4.2 KiB
Lua
local brute = require "brute"
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local coroutine = require "coroutine"
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local creds = require "creds"
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local shortport = require "shortport"
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local smtp = require "smtp"
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local stdnse = require "stdnse"
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description = [[
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Performs brute force password auditing against SMTP servers using either LOGIN, PLAIN, CRAM-MD5, DIGEST-MD5 or NTLM authentication.
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]]
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---
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-- @usage
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-- nmap -p 25 --script smtp-brute <host>
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--
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-- @output
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-- PORT STATE SERVICE REASON
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-- 25/tcp open stmp syn-ack
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-- | smtp-brute:
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-- | Accounts
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-- | braddock:jules - Valid credentials
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-- | lane:sniper - Valid credentials
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-- | parker:scorpio - Valid credentials
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-- | Statistics
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-- |_ Performed 1160 guesses in 41 seconds, average tps: 33
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--
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-- @args smtp-brute.auth authentication mechanism to use LOGIN, PLAIN,
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-- CRAM-MD5, DIGEST-MD5 or NTLM
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-- Version 0.1
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-- Created 07/15/2011 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
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author = "Patrik Karlsson"
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license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
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categories = {"brute", "intrusive"}
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portrule = shortport.port_or_service({ 25, 465, 587 },
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{ "smtp", "smtps", "submission" })
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local mech
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-- By using this connectionpool we don't need to reconnect the socket
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-- for each attempt.
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ConnectionPool = {}
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Driver =
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{
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-- Creates a new driver instance
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-- @param host table as received by the action method
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-- @param port table as received by the action method
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-- @param pool an instance of the ConnectionPool
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new = function(self, host, port)
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local o = { host = host, port = port }
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setmetatable(o, self)
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self.__index = self
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return o
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end,
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-- Connects to the server (retrieves a connection from the pool)
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connect = function( self )
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self.socket = ConnectionPool[coroutine.running()]
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if ( not(self.socket) ) then
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self.socket = smtp.connect(self.host, self.port, { ssl = true, recv_before = true })
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if ( not(self.socket) ) then return false end
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ConnectionPool[coroutine.running()] = self.socket
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end
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return true
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end,
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-- Attempts to login to the server
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-- @param username string containing the username
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-- @param password string containing the password
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-- @return status true on success, false on failure
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-- @return brute.Error on failure and creds.Account on success
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login = function( self, username, password )
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local status, err = smtp.login( self.socket, username, password, mech )
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if ( status ) then
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smtp.quit(self.socket)
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ConnectionPool[coroutine.running()] = nil
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return true, creds.Account:new(username, password, creds.State.VALID)
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end
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if ( err:match("^ERROR: Failed to .*") ) then
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self.socket:close()
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ConnectionPool[coroutine.running()] = nil
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local err = brute.Error:new( err )
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-- This might be temporary, set the retry flag
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err:setRetry( true )
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return false, err
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end
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return false, brute.Error:new( "Incorrect password" )
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end,
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-- Disconnects from the server (release the connection object back to
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-- the pool)
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disconnect = function( self )
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return true
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end,
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}
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local function fail (err) return stdnse.format_output(false, err) end
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action = function(host, port)
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local socket, response = smtp.connect(host, port, { ssl = true, recv_before = true })
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if ( not(socket) ) then return fail("Failed to connect to SMTP server") end
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local status, response = smtp.ehlo(socket, smtp.get_domain(host))
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if ( not(status) ) then return fail("EHLO command failed, aborting ...") end
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local mechs = smtp.get_auth_mech(response)
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if ( not(mechs) ) then
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return fail("Failed to retrieve authentication mechanisms form server")
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end
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smtp.quit(socket)
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local mech_prio = stdnse.get_script_args("smtp-brute.auth")
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mech_prio = ( mech_prio and { mech_prio } ) or
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{ "LOGIN", "PLAIN", "CRAM-MD5", "DIGEST-MD5", "NTLM" }
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for _, mp in ipairs(mech_prio) do
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for _, m in pairs(mechs) do
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if ( mp == m ) then
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mech = m
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break
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end
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end
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if ( mech ) then break end
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end
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local engine = brute.Engine:new(Driver, host, port)
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engine.options.script_name = SCRIPT_NAME
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local result
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status, result = engine:start()
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for _, sock in pairs(ConnectionPool) do sock:close() end
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return result
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end
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