使用fail2ban来阻止Ssh暴力入侵

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fail2ban可以设置对方密码失败n次后用防火墙屏蔽n分钟，
0A8R9zM ]Ju写入日志中，并可邮件你。BSD爱好者乐园E/w5ktg1A
时间到后会恢复iptables，很干净

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*U-`#St'\K"ehttp://sourceforge.net/projects/fail2ban/files/
iE+u{yB(_7JS^http://www.fail2ban.org/

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目前最新版为0.8.4BSD爱好者乐园3c iJZUiaG[$]

^6ql7bZOy |下载安装
(^%H3z'R$?wget "http://downloads.sourceforge.net/project/fail2ban/fail2ban-stable/fail2ban-0.8.4/fail2ban-0.8.4.tar.bz2?use_mirror=ncu"BSD爱好者乐园l"]NBT{MB
#tar xvfj fail2ban-0.8.4.tar.bz2
s/W:f"vt#cd fail2ban-0.8.4
/phN^@ d.Wl4G+X#python setup.py installBSD爱好者乐园TgNcw`8c_#a l
#cp ./files/redhat-initd /etc/init.d/fail2ban #./files目录下还有供其它系统使用的文件如:getoon,suse等
0u#@WFM |$k7_)~#chkconfig --add fail2ban #添加开机启动BSD爱好者乐园6J\7s }8ngda]
#chkconfig --list |grep fail2ban #检查一下是否已装载到服务
:u1sk%Uj5]#service fail2ban start 注:如果重起iptables 记的一定还要重起fail2ban，不然他就不能生效，fail2ban的过滤表是在iptables 启动后在加入的.

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Au"e?1C(Jz/oX修改配置文件

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-|f:vmVvX9A+_w/etc/fail2ban/fail2ban.conf
l-?+AMR*n2g_可以定义日志记录级别，保存路径及套接字文件，这个使用默认BSD爱好者乐园}4fN/Cq3Mu%y
#vi /etc/fail2ban/jail.confBSD爱好者乐园6q7^5e6v)M)JVm

vDs"b\ q{ignoreip = 127.0.0.1 # 忽悠 IP范围 如果有二组以上用空白做为间隔
3n H\0?'z S,}ybantime  = 600 # 设定 IP 被封锁的时间(秒)，如果值为 -1，代表永远封锁BSD爱好者乐园4S8j&m0i/q^PD*J_
findtime  = 600       # 设定在多少时间内达到 maxretry 的次数就封锁BSD爱好者乐园P8YMOLB6Q1m
maxretry = 3 # 允许尝试的次数BSD爱好者乐园#nR].o#X
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[ssh-iptables]BSD爱好者乐园*f8_9T4eo+t*|;tip
 #针对sshd暴力入侵防护
.~5K^Leenabled  = ture # 开启
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r1c(sdfilter   = sshd
V2\t_!_"Jq2bh_action   = iptables[name=SSH, port=6022, protocol=tcp] #我的sshd port为6022BSD爱好者乐园6}lhrZ\
#           sendmail-whois[name=SSH, dest=you@mail.com, sender=fail2ban@mail.com] #不发送邮件BSD爱好者乐园:? a2F)_n.ugER
logpath  = /var/log/secure #ssh 失败日志路径
A+p1tg'}F"@'?8A#Amaxretry = 3 #重试次数
#G5m#FV f\5ig!_测试BSD爱好者乐园;u&ez5X&^4g
#tail -f /var/log/secure /var/log/fail2ban.logBSD爱好者乐园'n&Zo+y-h
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==> /var/log/secure <==
9y#q!V9Kf7` xJan 13 17:02:02 localhost sshd[24207]: Failed password for c1g from 192.168.1.8 port 10270 ssh2
Tid4_y:N z*uu,qJan 13 17:02:12 localhost last message repeated 2 timesBSD爱好者乐园(i
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Jan 13 17:02:19 localhost sshd[24287]: Failed password for c1g from 192.168.1.8 port 10398 ssh2
3h9uN&MwfJan 13 17:02:28 localhost last message repeated 2 timesBSD爱好者乐园0`8P7E*L
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Jan 13 17:02:35 localhost sshd[24322]: Failed password for c1g from 192.168.1.8 port 10447 ssh2

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==> /var/log/fail2ban.log <==
N4m2j|3^`dh.F4q2010-01-13 17:02:36,849 fail2ban.actions: WARNING [ssh-iptables] Ban 192.168.1.8BSD爱好者乐园(@_K Yx6j dZ_8W6n

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==> /var/log/fail2ban.log <==BSD爱好者乐园*a/Q&lS Yg u
2010-01-13 17:12:36,852 fail2ban.actions: WARNING [ssh-iptables] Unban 192.168.1.8

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U9D*G}/M7L"up#fail2ban-client status ssh-iptablesBSD爱好者乐园\'LWo\po

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Status for the jail: ssh-iptablesBSD爱好者乐园)bwRA*^X&m h
|- filterBSD爱好者乐园 z
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| |- File list: /var/log/secure
c2h+L(J tieT| |- Currently failed: 0
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K| `- Total failed: 4BSD爱好者乐园6y*LD/z5Q:t!s1O+n
`- actionBSD爱好者乐园sI3DQt!G5iO X
|- Currently banned: 0
5G-kv]g)t| `- IP list:BSD爱好者乐园h*G$?A:lC1N
`- Total banned: 1

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*\`1G,FJ"ez配置日志
+_.pk}n5mEBkP1Q0Ag写一个logrotate的配置文件，并拷贝成/etc/logrotate.d/fail2ban，用来定期清理日志文件

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/var/log/fail2ban.log {
UU;e0@Jd-Cpm    missingok
gW.hf-W0iw    notifemptyBSD爱好者乐园8rcRP `#_M
    size 30k
0k:l-aM$VoS:B    create 0600 root root
2Gv&wt2N9V:a    postrotate
j ~dk7D*U#vkt^&z        /usr/bin/fail2ban-client reload 2> /dev/null || true
.Il^^x    endscript
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TAG: ssh 暴力破解 fail2ban