fail2ban帮助postfix过滤恶意IP


fail2ban帮助postfix过滤恶意IP
 
今天看postfix 日志,发现日志中报大量的NOQUEUE: reject: RCPT from unknown[183.60.103.208]: 504 5.5.2 ,而且在不停的换IP,频率很高,一分钟能收到2000左右的连接,虽然postfix 已经拒绝了请求,但是这也很浪费服务器资源。决定扼杀在萌芽状态。于是想起了fail2ban。
 
首先安装,yum 安装,需要epel 源
 
yum install fail2ban -y
 
cd /etc/fail2ban
 
vi jail.conf
 
#[postfix-tcpwrapper]
[POSTFIX]
enabled  = ture
port = smtp
filter   = postfix
logpath  = /var/log/zimbra.log ##日志
action   =iptables[name=Postfix, port=25, protocol=tcp] ##调用iptables 拒绝ip
ignoreip = 127.0.0.1 192.168.2.0/16 ##忽略的ip地址,或者是信任的ip地址
bantime  = 86400 #####禁止其访问的时间(秒)
findtime = 60 
maxretry = 5 ###最大尝试次数
 
vi filter.d/postfix.conf                
 
failregex = warning: (.*)\[<HOST>\]: SASL LOGIN authentication failed:
             reject: RCPT from (.*)\[<HOST>\]: 550 5.1.1
             reject: RCPT from (.*)\[<HOST>\]: 450 4.7.1
             reject: RCPT from (.*)\[<HOST>\]: 554 5.7.1
             reject: RCPT from (.*)\[<HOST>\]: 554 5.5.2
 
             reject: RCPT from (.*)\[<HOST>\]: 504 5.5.2###过滤规则,上面4条默认有,我另外加了两条
 
然后启动服务:service fail2ban start
 
查看状态:
 
 fail2ban-client status POSTFIX
Status for the jail: POSTFIX
|- filter
|  |- File list:        /var/log/zimbra.log 
|  |- Currently failed: 0
|  `- Total failed:     8
`- action
   |- Currently banned: 1
   |  `- IP list:       120.197.131.6 
   `- Total banned:     1
 
已经有IP地址了
 
iptables -L
 
Chain fail2ban-Postfix (1 references)
target     prot opt source               destination         
DROP       all  --  120.197.131.6        anywhere            
RETURN     all  --  anywhere             anywhere  
 
世界终于安静多了
 

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