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#!/usr/bin/env python3
# Copyright (C) 2007 Giampaolo Rodola' <g.rodola@gmail.com>.
# Use of this source code is governed by MIT license that can be
# found in the LICENSE file.
"""
A FTP server banning clients in case of commands flood.
If client sends more than 300 requests per-second it will be
disconnected and won't be able to re-connect for 1 hour.
"""
from pyftpdlib.authorizers import DummyAuthorizer
from pyftpdlib.handlers import FTPHandler
from pyftpdlib.servers import FTPServer
class AntiFloodHandler(FTPHandler):
cmds_per_second = 300 # max number of cmds per second
ban_for = 60 * 60 # 1 hour
banned_ips = []
def __init__(self, *args, **kwargs):
FTPHandler.__init__(self, *args, **kwargs)
self.processed_cmds = 0
self.pcmds_callback = self.ioloop.call_every(
1, self.check_processed_cmds
)
def on_connect(self):
# called when client connects.
if self.remote_ip in self.banned_ips:
self.respond('550 You are banned.')
self.close_when_done()
def check_processed_cmds(self):
# called every second; checks for the number of commands
# sent in the last second.
if self.processed_cmds > self.cmds_per_second:
self.ban(self.remote_ip)
else:
self.processed_cmds = 0
def process_command(self, *args, **kwargs):
# increase counter for every received command
self.processed_cmds += 1
FTPHandler.process_command(self, *args, **kwargs)
def ban(self, ip):
# ban ip and schedule next un-ban
if ip not in self.banned_ips:
self.log(f'banned IP {ip} for command flooding')
self.respond(f'550 You are banned for {self.ban_for} seconds.')
self.close()
self.banned_ips.append(ip)
def unban(self, ip):
# unban ip
try:
self.banned_ips.remove(ip)
except ValueError:
pass
else:
self.log(f'unbanning IP {ip}')
def close(self):
FTPHandler.close(self)
if not self.pcmds_callback.cancelled:
self.pcmds_callback.cancel()
def main():
authorizer = DummyAuthorizer()
authorizer.add_user('user', '12345', '.', perm='elradfmwMT')
authorizer.add_anonymous('.')
handler = AntiFloodHandler
handler.authorizer = authorizer
server = FTPServer(('', 2121), handler)
server.serve_forever(timeout=1)
if __name__ == '__main__':
main()
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