更改 fail2ban 设置以使用 pf 进行阻止

大家好，我是无能。今天是一篇无能中的无能文章。

咦！？fail2ban.log 里好像有奇怪的日志！

好吧好吧，正想着看看 fail2ban 阻止了什么……结果发现

2024-07-24 20:52:43,027 fail2ban.utils          [39963]: INFO    HINT on 127: "Command not found".  Make sure that all commands  
in "{ iptables -w -C f2b-sshd -j RETURN >/dev/null 2>&1; } || { iptables -w -N f2b-sshd || true; iptables -w -A f2b-sshd -j RE  
TURN; }  
for proto in $(echo 'tcp' | sed 's/,/ /g'); do  
{ iptables -w -C INPUT -p $proto -m multiport --dports ssh -j f2b-sshd  
 >/dev/null 2>&1; } || { iptables -w -I INPUT -p $proto -m multiport --dports ssh -j f2b-sshd; }  
done" are in the PATH of fail  
2ban-server process (grep -a PATH= /proc/pidof -x fail2ban-server/environ). You may want to start "fail2ban-server -f" separa  
tely, initiate it with "fail2ban-client reload" in another shell session and observe if additional informative error messages a  
ppear in the terminals.

咦，显示说找不到命令……我完全忘了！！！
FreeBSD 的情况是用 pf 控制的……GNU/Linux 的情况用 iptables 就可以了，但我明明在用 BSD 却完全忘了……所以，我将参考这个网站重新设置……https://dbdemon.com/pf_and_fail2ban因此，我将我的自建服务器设为 $exsrv1，所以

# Fail2Ban  
table &LTf2b> persist  
anchor "f2b/*"  
block drop in log quick on $exsrv1 from &LTf2b> to any

这样就设置好了。话说，f2b/* 竟然可以作为正则表达式吗……然后，重新设置 jail.conf。我乖乖地放到了 Default 部分。

[DEFAULT]  
banaction = pf[actiontype=&LTallports>]  
banaction_allports = pf[actiontype=&LTallports>]  
  
[sshd]  
enabled = true  
port    = ssh  
logpath = /var/log/auth.log  
bantime = 1w  
findtime = 1d  
maxretry = 5  
  
[postfix]  
enabled = true  
port    = smtp,ssmtp,submission  
logpath = /var/log/maillog  
bantime = 1w  
findtime = 1d  
maxretry = 10  
  
[dovecot]  
enabled = true  
port    = pop3,pop3s,imap,imaps,submission  
logpath = /var/log/maillog  
bantime = 1w  
findtime = 1d  
maxretry = 10

从配置文件来看，action.d/pf.conf 中默认已经设置好了，查看后发现

看起来像这样，调用命令时似乎不需要特别修改。然后，重启 fail2ban 和 pf，查看 fail2ban 的日志，发现之前被阻止的 IP 似乎都继承了下来。

# fail2ban-client status sshd  
Status for the jail: sshd  
|- Filter  
|  |- Currently failed: 1  
|  |- Total failed:     1  
|  `- File list:        /var/log/auth.log  
`- Actions  
   |- Currently banned: 37  
   |- Total banned:     37  
   `- Banned IP list:   *

接下来我会再观察一下。
那么。下次再见。

咦！？fail2ban.log 里好像有奇怪的日志！

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