更改 fail2ban 設定並使用 pf 阻擋

大家好，我是無能。今天是一篇無能中的無能文章。

咦！？fail2ban.log 裡怎麼出現奇怪的日誌了！

好吧好吧，正想看看 fail2ban 封鎖了什麼...結果一看

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，顯示說找不到指令...我完全忘記了！！！
FreeBSD 的情況下是用 pf 控制的啊...GNU/Linux 的情況下用 iptables 沒問題，但我明明在用 BSD 卻完全忘記了...所以，我將參考這個網站重新設定...https://dbdemon.com/pf_and_fail2ban因此，我將我的伺服器設定為 $exsrv1

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

這樣就設定好了。話說，f2b/* 這樣可以作為正規表達式嗎...然後，重新設定 jail.conf。我乖乖地把它放到了 Default 區塊。

[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

從設定檔來看，action.d/pf.conf 已經預設設定好了，查看後發現
看來像這樣，呼叫指令時似乎不需要特別修改。然後，重啟 fail2ban 和 pf，並檢查 fail2ban 的日誌，發現之前被封鎖的 IP 似乎會直接繼承下來。

# 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:   *

這樣我會再觀察看看。
那麼。下次再見了。

咦！？fail2ban.log 裡怎麼出現奇怪的日誌了！

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