为CentOS安装防DDOS攻击软件DDoS-Deflate
DDoS-Deflate是一款非常小巧的防御和减轻DDoS攻击的工具,它可以通过监测netstat来跟踪来创建大量互联网连接的IP地址信息,通过APF或IPTABLES禁止或阻档这些非常IP地址。我们可以使用netstat命令查看当前系统连接的状态,是否有受到DDOS攻击
# netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n
&http://www.aliyun.com/zixun/aggregation/37954.html">nbsp; 1 101.226.66.172
1 103.29.134.193
1 110.85.249.85
1 115.150.118.203
1 116.22.233.25
1 119.254.227.106
1 122.224.152.139
1 123.126.68.35
1 123.151.136.225
1 124.202.164.10
1 124.202.164.16
1 14.29.112.87
1 14.29.127.218
1 157.55.33.124
1 170.130.24.152
1 180.149.143.11
1 182.118.19.201
1 182.118.20.40
1 183.39.201.142
1 199.30.24.33
1 210.242.215.195
1 210.242.215.211
1 210.242.215.212
1 210.242.215.213
1 210.242.215.215
1 210.242.215.216
1 210.242.215.218
1 210.6.198.12
1 219.239.26.13
1 220.181.51.62
1 23.94.20.3
1 27.28.7.0
1 42.120.160.95
1 42.156.137.95
1 58.51.180.34
1 60.220.197.225
1 61.135.189.43
1 61.135.249.202
1 61.164.170.222
1 66.249.67.163
1 Address
1 servers)
2 124.202.164.11
2 218.109.165.44
2 220.181.125.20
2 223.104.20.49
2 42.156.136.95
2 61.51.249.58
2 72.52.94.226
3 210.242.215.210
3 222.76.109.133
4 120.39.165.97
4 123.113.42.119
5 110.244.82.238
5 118.72.107.112
5 222.141.238.211
6 110.153.48.75
6 111.206.125.33
6 124.117.235.163
6 60.215.180.43
7 101.226.89.117
9 111.20.119.234
9 119.126.238.114
9 183.32.67.179
10 121.35.228.194
10 122.141.235.146
11 183.63.97.42
12 106.125.11.78
13 114.228.158.82
13 118.228.151.171
14 222.129.186.143
15 113.231.87.141
17 113.137.204.201
20 119.251.38.134
20 61.164.36.34
30 58.215.136.89
44 58.215.136.105
101 127.0.0.1
查看iptables的状态
# service iptables status
表格:filter
Chain INPUT (policy ACCEPT)
numtarget prot opt source destination
1 ACCEPT all--0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
2 ACCEPT icmp --0.0.0.0/0 0.0.0.0/0
3 ACCEPT all--0.0.0.0/0 0.0.0.0/0
4 ACCEPT tcp--0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:21
5 ACCEPT tcp--0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:80
6 ACCEPT tcp--0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:3306
7 ACCEPT tcp--0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:58416
8 REJECT all--0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT)
numtarget prot opt source destination
1 REJECT all--0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT)
numtarget prot opt source destination
安装DDoS-Deflate
# wget http://www.inetbase.com/scripts/ddos/install.sh
# chmod +x install.sh
# ./install.sh
Installing DOS-Deflate 0.6
Downloading source files....
.....done
Creating cron to run script every minute.....(Default setting).....done
Installation has completed.
Config file is at /usr/local/ddos/ddos.conf
Please send in your comments and/or suggestions to [email protected]
DOS-Deflate已经安装好了。
DOS-Deflate卸载
wget http://www.inetbase.com/scripts/ddos/uninstall.ddos
chmod 0700 uninstall.ddos
./uninstall.ddos
DOS-Deflate文件的说明:
# cd /usr/local/ddos/
# ll
总用量 4
-rw-r--r-- 1 root root 971 1月10 2006 ddos.conf
-rwxr-xr-x 1 root root3945 1月10 2006 ddos.sh
-rw-r--r-- 1 root root 10 1月10 2006 ignore.ip.list
-rw-r--r-- 1 root root 10113 1月10 2006 LICENSE
DOS-Deflate安装好之后,全部的文件是放在/usr/local/ddos文件夹中。
文件说明:
ddos.conf -- DDoS-Deflate 的配置文件,其中配置防止ddos时的各种行为
ddos.sh -- DDoS-Deflate 的主程序,使用shell编写的,整个程序的功能模块
ignore.ip.list -- 白名单,该文件中的ip超过设定的连接数时,也不被 DDoS-Deflate 阻止
LICENSE -- DDoS-Deflate 程序的发布协议
配置ddos.conf
# cat ddos.conf
##### Paths of the script and other files #配置文件也是个shell脚本
PROGDIR="/usr/local/ddos"
PROG="/usr/local/ddos/ddos.sh"
IGNORE_IP_LIST="/usr/local/ddos/ignore.ip.list" #存放白名单的文件
CRON="/etc/cron.d/ddos.cron" #计划任务,默认是每分钟执行一次ddos.sh
APF="/etc/apf/apf"
IPT="/sbin/iptables"
##### frequency in minutes for running the script
##### Caution: Every time this setting is changed, run the script with --cron
##### option so that the new frequency takes effect
FREQ=1#DDoS-Deflate通过linux的计划任务执行,默认为每分钟一次
##### How many connections define a bad IP? Indicate that below.
NO_OF_CONNECTIONS=150 #定义单个IP达到多少连接时规定为这是一次ddos攻击
##### APF_BAN=1 (Make sure your APF version is atleast 0.96)
##### APF_BAN=0 (Uses iptables for banning ips instead of APF)
APF_BAN=0#这里为 “0”,表示使用iptables,而不是APF
##### KILL=0 (Bad IPs are'nt banned, good for interactive execution of script)
##### KILL=1 (Recommended setting)
KILL=1#是否阻止被定义为ddos攻击的ip,“1”为阻止
##### An email is sent to the following address when an IP is banned.
##### Blank would suppress sending of mails
EMAIL_TO="[email protected]"#事件通知人的邮件地址
##### Number of seconds the banned ip should remain in blacklist.
BAN_PERIOD=600 #阻止被定义为ddos攻击者ip与本机通信时间,默认为600秒
ddos.sh文件内容:
# ./ddos.sh -h
DDoS-Deflate version 0.6
Copyright (C) 2005, Zaf <[email protected]>
Usage: ddos.sh
N : number of tcp/udp connections (default 150)
OPTIONS:
-h | --help: Show this help screen
-c | --cron: Create cron job to run this script regularly (default 1 mins)
-k | --kill: Block the offending ip making more than N connections
测试防ddos攻击效果
NO_OF_CONNECTIONS=3
#这里为了方便测试,设置为3。生产环境下,几十到几百都可以理解为正常,上千肯定就是不正常了,除非是应用内部各个服务器之间的通信
通过一台固定ip的机器ssh连接该服务器,当连接到超过3甚至更多时,不会立刻显示连不上,因为ddos.sh默认一分钟运行一次,当过不到一分钟时,会发现连接掉了,查看部署了防ddos软件的服务器上可以看到iptables的策略中多了:
DROP all -- 31.210.16.29.broad.cs.gd.dynamic.163data.com.cn anywhere
说明确实生效了,当10分钟后,iptables上这条策略会被取消的
关于如何查看单个IP的连接数目可以通过如下命令查看,依次排列:
netstat -na|grep ESTABLISHED|awk '{print $5}'|awk -F: '{print $1}'|sort|uniq -c|sort -r -n
..............
40 127.0.0.1
1 121.9.252.28
1 173.117.140.69
ddos攻击很常见,攻击效果也很好,比如像前段时间由于维基创始人引发的那次大范围的攻击。
如果有专门防止ddos的硬件设备的话最好,没有的话就利用DDoS-Deflate结合iptables在一定程度上防范ddos攻击也是一种很好的策略。 低调是最好的选择。尽量不在某些地方显摆,不要过于招摇,也算做了一道安全防御吧!话说人在江湖飘,哪有不挨刀?防患于未然,是很有必要的。好了,废话说了一堆,现在安装DDos deflate。
在说到DDos deflate之前,我们还需要了解一个东西:iptables
iptables是linux内核集成的IP信息包过滤系统,他可以简单的添加、编辑和除去规则,而这些规则是在做信息包过滤决定时,防火墙所遵循和组成的规则。
我们首选确认iptables服务状态
# service iptables staus
确认之后,安装DDos deflate
# wget http://www.inetbase.com/scripts/ddos/install.sh
# chmod +x install.sh
# ./install.sh
安装完成后,还需要修改配置文件,达到利用iptables自动锁定IP的目的。
# vi /usr/local/ddos/ddos.conf
接下来修改,这里主要是APF_BAN=1修改为0(使用iptables),另外EMAIL_TO="root"可以将root修改为你的一个Email地址,这样系统办掉哪个IP,会有邮件提示你。
-----------------------------------------
##### Paths of the script and other files
PROGDIR=”/usr/local/ddos”
PROG=”/usr/local/ddos/ddos.sh”
IGNORE_IP_LIST=”/usr/local/ddos/ignore.ip.list”//IP地址白名单
CRON=”/etc/cron.d/ddos.cron” //定时执行程序
APF=”/etc/apf/apf”
IPT=”/sbin/iptables”
##### frequency in minutes for running the script
##### Caution: Every time this setting is changed, run the script with –cron
##### option so that the new frequency takes effect
FREQ=1 //检查时间间隔,默认1分钟
##### How many connections define a bad IP? Indicate that below.
NO_OF_CONNECTIONS=150 //最大连接数,超过这个数IP就会被屏蔽,一般默认即可
##### APF_BAN=1 (Make sure your APF version is atleast 0.96)
##### APF_BAN=0 (Uses iptables for banning ips instead of APF)
APF_BAN=0 //使用APF还是iptables。推荐使用iptables,将APF_BAN的值改为0即可。
##### KILL=0 (Bad IPs are’nt banned, good for interactive execution of script)
##### KILL=1 (Recommended setting)
KILL=1 //是否屏蔽IP,默认即可
##### An email is sent to the following address when an IP is banned.
##### Blank would suppress sending of mails
[email protected] //当IP被屏蔽时给指定邮箱发送邮件,推荐使用,换成自己的邮箱
##### Number of seconds the banned ip should remain in blacklist.
BAN_PERIOD=600 //禁用IP时间,默认600秒,可根据情况调整
-------------------------------------------------------------
由于这个系统默认白名单有些问题,经常会有失误,所以,我们最好再设定手工设置白名单并不可修改。
# vi /usr/local/ddos/ignore.ip.list#手工设置白名单IP
# chattr +i /usr/local/ddos/ignore.ip.list #强制不允许修改
# chattr -i /usr/local/ddos/ignore.ip.list #解除不允许修改
卸载DDos deflate方法。
# wget http://www.inetbase.com/scripts/ddos/uninstall.ddos
# chmod 700 uninstall.ddos
# ./uninstall.ddos
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