用fail2ban阻止SSH和VSFTP暴力破解密码

某几个IP最近一直不停的在试图登录SSH和FTP。把机器上的几个虚拟主机都猜了一遍。
用fail2ban加个屏蔽吧。三次猜不对,就jail里休息俩小时再回来。

一、下载安装

#wget http://cdnetworks-kr-2.dl.sourceforge.net/project/fail2ban/fail2ban-stable/fail2ban-0.8.4/fail2ban-0.8.4.tar.bz2
#tar xvfj fail2ban-0.8.4.tar.bz2
#cd fail2ban-0.8.4
#python setup.py install
#cd files
# cp ./redhat-initd /etc/init.d/fail2ban
# chkconfig –add fail2ban
#service fail2ban start

注意: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。

二、配置
1、fail2ban本身配置
默认fail2ban.conf里面就三个参数,而且都有注释。
#默认日志的级别
loglevel = 3
#日志的存放路径
logtarget = /var/log/fail2ban.log
#socket的位置
socket = /tmp/fail2ban.sock

2、fail2ban防护配置
全局设置
# vi /etc/fail2ban/jail.conf
# 忽悠 IP范围 如果有二组以上用空白做为间隔
ignoreip = 127.0.0.1
# 设定 IP 被封锁的时间(秒),如果值为 -1,代表永远封锁
bantime = 86400
# 设定在多少时间内达到 maxretry 的次数就封锁
findtime = 600
# 设定在多少时间内达到 maxretry 的次数就封锁
maxretry = 3
# 允许尝试的次数

分类设置
#针对sshd暴力入侵防护

[ssh-iptables]
enabled = true
filter = sshd
action = iptables[name=SSH, port=ssh, protocol=tcp]
sendmail-whois[name=SSH, dest=you@mail.com, sender=fail2ban@mail.com]
logpath = /var/log/secure
# 如果有个别的次数设定就设在这里
maxretry = 3

#针对vsftpd暴力入侵防护

[vsftpd-iptables]
enabled = true
filter = vsftpd
action = iptables[name=VSFTPD, port=ftp, protocol=tcp]
sendmail-whois[name=VSFTPD, dest=you@mail.com]
logpath = /var/log/secure
maxretry = 3

建议设置成maxretry为 3 表示3次错误就封锁,另外logpath(Centos5和Rhel5中)要改成/var/log/secure。

然后我们设置启动服务:
#chkconfig –level 345 fail2ban on
#service fail2ban start

三、测试:
查看iptables 的规则多出了 iptables-ssh的规则

iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
fail2ban-SSH tcp — anywhere anywhere tcp dpt:ssh
fail2ban-SSH tcp — anywhere anywhere tcp dpt:ssh
Chain fail2ban-SSH (2 references)
target prot opt source destination
Drop all — 122.102.64.54 anywhere

# 这有一个被阻止的IP 拒绝时间根据在你的配置文件设置时间有关 我设置的是一天
RETURN all — anywhere anywhere

++++++++++++++++++++++++++++++++++++++++++++++++++++++++
在其他的机器上ssh 192.168.1.2
连续三次输错密码

使用命令fail2ban-client status ssh-iptables
查看阻止状态

或者

fail2ban-client status
Status
|- Number of jail: 1
`- Jail list: ssh-iptables

测试结果:
#fail2ban-client status ssh-iptables
Status for the jail: ssh-iptables
|- filter
| |- File list: /var/log/secure
| |- Currently failed: 0
| `- Total failed: 3
`- action
|- Currently banned: 1
| `- IP list: 192.168.1.1
`- Total banned: 1

++++++++++++++++++++++++++++++++++++++++++++++++++++++++

我们在来看看fail2ban的日志记录

2010-05-17 16:57:23,964 fail2ban.actions: WARNING [ssh-iptables] Ban 192.168.1.1
2010-05-17 21:35:00,449 fail2ban.actions: WARNING [ssh-iptables] Ban 218.108.85.244
2010-05-18 03:56:34,986 fail2ban.actions: WARNING [ssh-iptables] Ban 59.39.66.30

记录了被阻止的IP,成功阻止了ssh 密码猜测

原载于: http://jed.dzhope.com/read.php?738

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