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|
local brute = require "brute"
local creds = require "creds"
local nmap = require "nmap"
local shortport = require "shortport"
local stdnse = require "stdnse"
local string = require "string"
description = [[
Performs brute force password auditing against FTP servers.
Based on old ftp-brute.nse script by Diman Todorov, Vlatko Kosturjak and Ron Bowes.
06.08.16 - Modified by Sergey Khegay to support new brute.lua adaptability mechanism.
]]
---
-- @usage
-- nmap --script ftp-brute -p 21 <host>
--
-- This script uses brute library to perform password
-- guessing.
--
-- @output
-- PORT STATE SERVICE
-- 21/tcp open ftp
-- | my-ftp-brute:
-- | Accounts
-- | root:root - Valid credentials
-- | Statistics
-- |_ Performed 510 guesses in 610 seconds, average tps: 0
--
-- @args ftp-brute.timeout the amount of time to wait for a response on the socket.
-- Lowering this value may result in a higher throughput for servers
-- having a delayed response on incorrect login attempts. (default: 5s)
author = "Aleksandar Nikolic"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"intrusive", "brute"}
portrule = shortport.port_or_service(21, "ftp")
local arg_timeout = stdnse.parse_timespec(stdnse.get_script_args(SCRIPT_NAME .. ".timeout"))
arg_timeout = (arg_timeout or 5) * 1000
Driver = {
new = function(self, host, port)
local o = {}
setmetatable(o, self)
self.__index = self
o.host = host
o.port = port
return o
end,
connect = function( self )
self.socket = brute.new_socket()
local status, err = self.socket:connect(self.host, self.port)
self.socket:set_timeout(arg_timeout)
if(not(status)) then
return false, brute.Error:new( "Couldn't connect to host: " .. err )
end
return true
end,
login = function (self, user, pass)
local status, err
local res = ""
status, err = self.socket:send("USER " .. user .. "\r\n")
if(not(status)) then
return false, brute.Error:new("Couldn't send login: " .. err)
end
status, err = self.socket:send("PASS " .. pass .. "\r\n")
if(not(status)) then
return false, brute.Error:new("Couldn't send login: " .. err)
end
-- Create a buffer and receive the first line
local buffer = stdnse.make_buffer(self.socket, "\r?\n")
local line = buffer()
-- Loop over the lines
while(line)do
stdnse.debug1("Received: %s", line)
if(string.match(line, "^230")) then
stdnse.debug1("Successful login: %s/%s", user, pass)
return true, creds.Account:new( user, pass, creds.State.VALID)
elseif(string.match(line, "^530")) then
return false, brute.Error:new( "Incorrect password" )
elseif(string.match(line, "^421")) then
local err = brute.Error:new("Too many connections")
err:setReduce(true)
return false, err
elseif(string.match(line, "^220")) then
elseif(string.match(line, "^331")) then
else
stdnse.debug1("WARNING: Unhandled response: %s", line)
local err = brute.Error:new("Unhandled response")
err:setRetry(true)
return false, err
end
line = buffer()
end
return false, brute.Error:new("Login didn't return a proper response")
end,
disconnect = function( self )
self.socket:close()
return true
end
}
action = function( host, port )
local status, result
local engine = brute.Engine:new(Driver, host, port)
engine.options.script_name = SCRIPT_NAME
status, result = engine:start()
return result
end
|
