1 files changed, 105 insertions, 0 deletions
diff --git a/scripts/ftp-brute.nse b/scripts/ftp-brute.nse
new file mode 100644
index 0000000..9a7a565
--- /dev/null
+++ b/scripts/ftp-brute.nse
@@ -0,0 +1,105 @@
+local brute = require "brute"
+local creds = require "creds"
+local shortport = require "shortport"
+local stdnse = require "stdnse"
+local ftp = require "ftp"
+
+description = [[
+Performs brute force password auditing against FTP servers.
+
+Based on old ftp-brute.nse script by Diman Todorov, Vlatko Kosturjak and Ron Bowes.
+]]
+
+---
+-- @see ftp-anon.nse
+--
+-- @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
+-- | 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)
+
+-- 06.08.16 - Modified by Sergey Khegay to support new brute.lua adaptability mechanism.
+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()
+    -- discard buffer, we'll create a new one over the BruteSocket later
+    local realsocket, code, message, buffer = ftp.connect(self.host, self.port, {request_timeout=arg_timeout})
+    if not realsocket then
+      return false, brute.Error:new( "Couldn't connect to host: " .. (code or message) )
+    end
+    self.socket.socket = realsocket
+    return true
+  end,
+
+  login = function (self, user, pass)
+    local buffer = stdnse.make_buffer(self.socket, "\r?\n")
+    local status, code, message = ftp.auth(self.socket, buffer, user, pass)
+
+    if not status then
+      if not code then
+        return false, brute.Error:new("socket error during login: " .. message)
+      elseif code == 530 then
+        return false, brute.Error:new( "Incorrect password" )
+      elseif code == 421 then
+        local err = brute.Error:new("Too many connections")
+        err:setReduce(true)
+        return false, err
+      else
+        stdnse.debug1("WARNING: Unhandled response: %d %s", code, message)
+        local err = brute.Error:new("Unhandled response")
+        err:setRetry(true)
+        return false, err
+      end
+    end
+
+    stdnse.debug1("Successful login: %s/%s", user, pass)
+    return true, creds.Account:new( user, pass, creds.State.VALID)
+  end,
+
+  disconnect = function( self )
+    ftp.close(self.socket)
+    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