python脚本使用阿里云slb对恶意攻击进行封堵的实现

环境准备：

1.安装python3.7和相关的依赖

并安装redis缓存数据库

pip install aliyun-python-sdk-core
pip install aliyun-python-sdk-slb
pip intall IPy
pip intall redis
pip intall paramiko

2.添加ram访问控制的编程接口用户

3.添加slb的访问控制策略并和需要频控的slb进行绑定

redis封堵ip的格式

脚本程序目录

Aliyun_SLB_Manager
├── helpers
│   ├── common.py
│   ├── email.py
│   ├── remote.py
│   └── slb.py
├── logs
│   └── run_20210204.log
└── run.py

# 程序核心就是使用shell命令对nginx的日志中出现的ip地址 和 访问的接口进行过滤，找出访问频繁的那些程序加入slb黑名单，同时加入redis缓存，因为slb有封堵ip个数限制，redis中存储的ip需要设置过期时间，对比后删除slb中封堵的Ip

# grep 04/Feb/2021:15:4 /data/www/logs/nginx_log/access/masterapi.chinasoft.cn_access.log | grep '/api' | awk '{print $1}' | sort | uniq -c | sort -r -n | head -200
  2454 114.248.45.15
  1576 47.115.122.23
  1569 47.107.239.148
  269 112.32.217.52

grep 04/Feb/2021:14:5 /data/www/logs/nginx_log/access/masterapi.chinasoft.cn_access.log | grep '/api' | awk '{print $1}' | awk -F ':' '{print $2}' | sort | uniq -c | sort -r -n | head -200 | awk '{if ($1 >15)print $1,$2}'

[root@alisz-edraw-api-server-web01:~]# grep 04/Feb/2021:15:4 /data/www/logs/nginx_log/access/masterapi.chinasoft.cn_access.log | grep '/api' | awk '{print $1}' | sort | uniq -c | sort -r -n | head -3
  2454 114.248.45.15
  1576 47.115.122.23
  1569 47.107.239.148

python脚本
主入口程序

run.py

import time
from helpers.email import send_mail
from helpers.remote import get_black_ips
from helpers.common import is_white_ip,get_ban_ip_time,set_ban_ip_time,groups
from helpers.slb import slb_add_host,slb_del_host,slb_get_host

if __name__ == "__main__":
  # aliyun 访问控制针对 slb 的管理用户
  # 用户登录名称 slb-frequency-user@xxx.onaliyun.com
  accessKeyId = 'id'
  accessSecret = 'pass'

  # slb 访问控制策略id
  acl_id = 'acl-slb'
  # reginid 查询地址：https://help.aliyun.com/document_detail/40654.html?spm=a2c6h.13066369.0.0.54a17471VmN3kA
  region_id = 'cn-shenzhen'
  # 黑名单限制个数 300
  slb_limit = 200
  # 每10分钟访问限制阈值
  threshold = 50
  # 接收邮箱
  mails = ['reblue520@chinasoft.cn']

  # 远程ssh执行grep过滤出可疑ip
  res = get_black_ips(threshold)
  deny_host_list = res[0]
  hosts_with_count = res[1]
  hosts_with_count = sorted(hosts_with_count.items(), key=lambda x: x[1] , reverse=True)
  print(hosts_with_count)
  # exit()
  # 等待被ban的ip , 过滤掉ip白名单
  deny_hosts = []
  for host in deny_host_list:
    if (is_white_ip(host) == False):
      deny_hosts.append(host + '/32')

  # 获取所有已经被ban的ip
  response = slb_get_host(accessKeyId , accessSecret , acl_id , region_id)
  denied_hosts = []
  if('AclEntrys' in response.keys()):
    for item in response['AclEntrys']['AclEntry']:
      denied_hosts.append(item['AclEntryIP'])

  # 被ban超过2天，首先移除
  must_del_hosts = []
  denied_hosts_clone = denied_hosts.copy()
  for host in denied_hosts:
    if (get_ban_ip_time(host) == 0 or (get_ban_ip_time(host) < int(round(time.time())) - 2* 24 * 3600)):
      must_del_hosts.append(host)
      denied_hosts_clone.remove(host)

  # 排除相同的
  deny_hosts_new = []
  for item in deny_hosts:
    if(item not in denied_hosts_clone):
      deny_hosts_new.append(item)

  # 两者和超过300的限制
  if((len(denied_hosts_clone)+len(deny_hosts_new))>slb_limit):
    denied_hosts_detail = {}
    for host in denied_hosts_clone:
      denied_hosts_detail[host] = get_ban_ip_time(host)
    # 需要排除的数量
    num = len(denied_hosts_clone) + len(deny_hosts_new) - slb_limit
    denied_hosts_detail = sorted(denied_hosts_detail.items(), key=lambda x: x[1])
    denied_hosts_detail = denied_hosts_detail[:num]
    for item in denied_hosts_detail:
      must_del_hosts.append(item[0])

  print("denied:",denied_hosts)
  print("delete:",must_del_hosts)
  print("add:",deny_hosts_new)
  # exit()
  # 先删除一部分 must_del_hosts
  if(len(must_del_hosts)>0):
    if (len(must_del_hosts)>50):
      must_del_hosts_clone = groups(must_del_hosts,50)
      for item in must_del_hosts_clone:
        slb_del_host(item, accessKeyId, accessSecret, acl_id, region_id)
        time.sleep(1)
    else :
      slb_del_host(must_del_hosts, accessKeyId, accessSecret, acl_id, region_id)

  # 再新增 deny_hosts_new
  if(len(deny_hosts_new)>0):
    if(len(deny_hosts_new)>50):
      deny_hosts_new_clone = groups(deny_hosts_new,50)
      for item in deny_hosts_new_clone:
        slb_add_host(item, accessKeyId, accessSecret, acl_id, region_id)
        time.sleep(1)
    else:
      slb_add_host(deny_hosts_new, accessKeyId, accessSecret, acl_id, region_id)

  # 记录ip被禁时间
  for host in deny_hosts_new:
    set_ban_ip_time(host)

  if (len(deny_hosts_new) >= 1):
    mail_content = ''
    if(len(must_del_hosts) > 0):
      mail_content += "以下黑名单已被解禁("+str(len(must_del_hosts))+"):\n"+"\n".join(must_del_hosts) + "\n"
    mail_content += "\n新增以下ip黑名单("+str(len(deny_hosts_new))+"):\n"+"\n".join(deny_hosts_new)
    mail_content += "\n\n10分钟访问超过15次("+str(len(hosts_with_count))+"):\n"
    for item in hosts_with_count:
      mail_content += str(item[1]) + " " + str(item[0]) + "\n"
    mail_content += "\n\n黑名单("+str(len(denied_hosts))+"个):\n"
    for item in denied_hosts:
      mail_content += str(item) + "\n"
    send_mail(mail_content , mails)

slb操作相关的脚本
slb.py

import logging , json

from aliyunsdkcore.client import AcsClient
from aliyunsdkslb.request.v20140515.AddAccessControlListEntryRequest import AddAccessControlListEntryRequest
from aliyunsdkslb.request.v20140515.RemoveAccessControlListEntryRequest import RemoveAccessControlListEntryRequest
from aliyunsdkslb.request.v20140515.DescribeAccessControlListAttributeRequest import DescribeAccessControlListAttributeRequest

# 阿里云slb访问控制里添加ip
def slb_add_host(hosts, accessKeyId, accessSecret, acl_id, region_id):
  client = AcsClient(accessKeyId, accessSecret, region_id)
  request = AddAccessControlListEntryRequest()
  request.set_accept_format('json')
  logging.info("正在封印IP：%s" % ",".join(hosts))

  try:
    add_hosts = []
    for host in hosts:
      add_hosts.append({"entry": host, "comment": "deny"})

    request.set_AclEntrys(add_hosts)
    request.set_AclId(acl_id)
    response = client.do_action_with_exception(request)
    print(response)
  except BaseException as e:
    logging.error("添加黑名单失败，原因：%s" % e)

# slb删除ip
def slb_del_host(hosts, accessKeyId, accessSecret, acl_id , region_id = 'us-west-1'):
  logging.info("正在解封IP：%s" % ",".join(hosts))
  try:
    del_hosts = []
    for host in hosts:
      del_hosts.append({"entry": host, "comment": "deny"})

    client = AcsClient(accessKeyId, accessSecret, region_id)
    request = RemoveAccessControlListEntryRequest()
    request.set_accept_format('json')
    request.set_AclEntrys(del_hosts)
    request.set_AclId(acl_id)

    client.do_action_with_exception(request)
    logging.info("slb删除IP:%s成功" % ",".join(hosts)) # 查看调用接口结果
    logging.info("slb删除IP:%s成功" % ",".join(hosts)) # 查看调用接口结果
  except BaseException as e:
    logging.error("移出黑名单失败，原因：%s" % e)

# 阿里云slb获取IP黑名单列表
def slb_get_host(accessKeyId, accessSecret, acl_id, region_id):
  client = AcsClient(accessKeyId, accessSecret, region_id)
  request = DescribeAccessControlListAttributeRequest()
  request.set_accept_format('json')

  try:
    request.set_AclId(acl_id)
    response = client.do_action_with_exception(request)
    data_sub = json.loads((response.decode("utf-8")))
    return data_sub
  except BaseException as e:
    logging.error("获取黑名单失败，原因：%s" % e)

远程操作日志的脚本
remote.py

#!/usr/bin/python
# -*- coding: UTF-8 -*-

import datetime
import re
import paramiko

def get_black_ips(threshold = 100):
  # file = '/data/www/logs/nginx_log/access/*api*_access.log'
  file = '/data/www/logs/nginx_log/access/masterapi.chinasoft.cn_access.log'
  # 可以 ssh 访问服务器 nginx 日志的用户信息
  username = 'apache'
  passwd = 'pass'

  ten_min_time = (datetime.datetime.now() - datetime.timedelta(minutes=10)).strftime("%d/%b/%Y:%H:%M")
  ten_min_time = ten_min_time[:-1]

  # 线上 需要对日志进行过滤的目标服务器，一般是内网ip，本地调试时可以直接使用外网ip方便调试
  ssh_hosts = ['1.1.1.1']
  deny_host_list = []
  for host in ssh_hosts:

    '''
    # 过滤日志文件，需要显示如下效果，次数 ip地址,需要定位具体的api接口，否则误伤率极高
    # grep 04/Feb/2021:15:2 /data/www/logs/nginx_log/access/masterapi.chinasoft.cn_access.log | grep '/api' | awk '{print $1}' | sort | uniq -c | sort -r -n | head -5 | awk '{if ($1 >15)print $1,$2}'
    2998 116.248.89.2
    2381 114.248.45.15
    1639 47.107.239.148
    1580 47.115.122.23
    245 59.109.149.45
    '''
    shell = (
          # "grep %s %s | grep '/index.php?submod=checkout&method=index&pid' | awk '{print $1}' | awk -F ':' '{print $2}' | sort | uniq -c | sort -r -n | head -200 | awk '{if ($1 >15)print $1,$2}'") % (
          # grep 04/Feb/2021:14:5 /data/www/logs/nginx_log/access/masterapi.chinasoft.cn_access.log | grep '/api/user' | awk '{print $1}' | awk -F ':' '{print $2}' | sort | uniq -c | sort -r -n | head -200 | awk '{if ($1 >15)print $1,$2}'
          "grep %s %s | grep '/api' | awk '{print $1}' | sort | uniq -c | sort -r -n | head -200 | awk '{if ($1 >2000)print $1,$2}'") % (
          ten_min_time, file)
    print(shell)
    ssh = paramiko.SSHClient()
    ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    ssh.connect(host, port=2020, username=username, password=passwd)
    stdin, stdout, stderr = ssh.exec_command(shell)
    result = stdout.read().decode(encoding="utf-8")
    deny_host_re = re.compile(r'\d{1,99} \d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}')
    deny_host_re = deny_host_re.findall(result)
    deny_host_list = deny_host_list + deny_host_re

  uniq_host = {}
  for host_str in deny_host_list:
    tmp = host_str.split(' ')
    if tmp[1] in uniq_host:
      uniq_host[tmp[1]] += int(tmp[0])
    else:
      uniq_host[tmp[1]] = int(tmp[0])

  deny_host_list = []
  for v in uniq_host:
    if (uniq_host[v] > threshold):
      deny_host_list.append(v)

  return [deny_host_list , uniq_host]

发送邮件的脚本
email.py

#!/usr/bin/python
# -*- coding: UTF-8 -*-

import smtplib
from email.mime.text import MIMEText
from email.header import Header
import logging

def send_mail(host , receivers):
  # 发送邮件的服务器，用户信息
  mail_host = "smtpdm-ap-southeast-1.aliyun.com"
  mail_user = "admin@mail.chinasoft.com"
  mail_pass = "pass"

  sender = 'admin@mail.chinasoft.com'

  message = MIMEText('chinasoft国内接口被刷,单个IP最近10分钟内访问超过阈值100次会收到此邮件告警!!!!\n%s' % (host), 'plain', 'utf-8')
  message['From'] = Header("chinasoft国内接口被刷", 'utf-8')

  subject ='[DDOS]购买链接接口异常链接!!'
  message['Subject'] = Header(subject, 'utf-8')

  try:
    smtpObj = smtplib.SMTP(mail_host, 80)
    smtpObj.login(mail_user, mail_pass)
    smtpObj.sendmail(sender, receivers, message.as_string())
    logging.info("邮件发送成功")
  except smtplib.SMTPException as e:
    logging.error("发送邮件失败，原因：%s" % e)

配置文件
common.py

#!/usr/bin/python
# -*- coding: UTF-8 -*-

import IPy
from functools import reduce
import redis,time

def groups(L1,len1):
  groups=zip(*(iter(L1),)*len1)
  L2=[list(i) for i in groups]
  n=len(L1) % len1
  L2.append(L1[-n:]) if n !=0 else L2
  return L2

def ip_into_int(ip):
  return reduce(lambda x, y: (x << 8) + y, map(int, ip.split('.')))

# 过滤掉内网ip
def is_internal_ip(ip):
  ip = ip_into_int(ip)
  net_a = ip_into_int('10.255.255.255') >> 24
  net_b = ip_into_int('172.31.255.255') >> 20
  net_c = ip_into_int('192.168.255.255') >> 16
  return ip >> 24 == net_a or ip >> 20 == net_b or ip >> 16 == net_c

# 是否为白名单ip （公司内网+集群内网ip+slb和需要互访的服务器ip避免误杀）
def is_white_ip(ip):
  if (is_internal_ip(ip)):
    return True
  white_hosts = [
    # web-servers
    '1.1.1.1',
    '1.1.1.2',
  ];
  for white in white_hosts:
    if (ip in IPy.IP(white)):
      return True
  return False

def get_ban_ip_time(ip):
  pool = redis.ConnectionPool(host='127.0.0.1', port=6379, db=1)
  client = redis.Redis(connection_pool=pool)
  key = 'slb_ban_'+ip
  val = client.get(key)
  if val == None:
    return 0
  else :
    return int(val)

def set_ban_ip_time(ip):
  pool = redis.ConnectionPool(host='127.0.0.1', port=6379, db=1)
  client = redis.Redis(connection_pool=pool)
  key = 'slb_ban_'+ip
  timestamp = time.time()
  timestamp = int(round(timestamp))
  return client.set(key , timestamp , 86400)

本地可以直接运行run.py进行调试

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