我有一個郵件伺服器，帶有dovecot.我fail2ban在啟用監獄的情況下運行它[dovecot]。這是該監獄的現狀。
# fail2ban-client status dovecot
Status for the jail: dovecot
|- Filter
| |- Currently failed: 5
| |- Total failed: 94
| `- File list: /var/log/mail.warn /var/log/auth.log
`- Actions
|- Currently banned: 23
|- Total banned: 23
`- Banned IP list: 102.165.49.129 114.220.45.96 115.98.44.72 117.20.117.40 117.81.173.196 117.81.173.227 121.227.161.24 121.239.88.158 180.107.116.92 180.107.125.85 185.137.111.14 185.137.111.145 185.137.111.44 185.137.111.77 185.234.216.120 221.225.183.210 221.225.183.214 221.225.26.196 45.13.36.22 45.227.253.107 49.73.157.152 5.178.153.116 111.94.169.183
我已將區塊類型從預設值重新定義REJECT --reject-with icmp-port-unreachable為DROP.這是 的輸出iptables -S。
...
-A f2b-dovecot -s 45.13.36.22/32 -j DROP
-A f2b-dovecot -s 221.225.26.196/32 -j DROP
-A f2b-dovecot -s 221.225.183.214/32 -j DROP
-A f2b-dovecot -s 221.225.183.210/32 -j DROP
-A f2b-dovecot -s 185.234.216.120/32 -j DROP
-A f2b-dovecot -s 185.137.111.77/32 -j DROP
-A f2b-dovecot -s 185.137.111.44/32 -j DROP
-A f2b-dovecot -s 185.137.111.145/32 -j DROP
-A f2b-dovecot -s 185.137.111.14/32 -j DROP
-A f2b-dovecot -s 180.107.125.85/32 -j DROP
-A f2b-dovecot -s 180.107.116.92/32 -j DROP
-A f2b-dovecot -s 121.239.88.158/32 -j DROP
-A f2b-dovecot -s 121.227.161.24/32 -j DROP
-A f2b-dovecot -s 117.81.173.227/32 -j DROP
-A f2b-dovecot -s 117.81.173.196/32 -j DROP
-A f2b-dovecot -s 117.20.117.40/32 -j DROP
-A f2b-dovecot -s 115.98.44.72/32 -j DROP
-A f2b-dovecot -s 114.220.45.96/32 -j DROP
-A f2b-dovecot -s 102.165.49.129/32 -j DROP
...
但是，我不斷收到類似的訊息
May 27 22:27:08 mail auth: pam_unix(dovecot:auth): authentication failure; logname= uid=0 euid=0 tty=dovecot [email protected] rhost=185.137.111.77
我認為 IMAP 連線是從這些被禁止的 IP 位址嘗試的。但是，當我手動運行時
iptables -I f2b-dovecot <MY_IP> -j DROP
並運行
telnet MY_MAIL_SERVER 993
數據包按預期被丟棄。
Q：為什麼我仍然收到pam_unix(dovecot:auth) authentication failure訊息auth.log？與 IMAP 連接埠的連線是否已封鎖？