Fail2ban dovecot

Hydra installieren

• apt install hydra

brute Force auf den Rechner

• hydra -S -v -l xinux -P bad-passwords -s 993 -f 10.88.201.21 imap

sshd in fail2ban aktivieren

• sed -ie "/^\[dovecot\]/aenabled = true" jail.local

fail2ban neustarten

• systemctl restart fail2ban

Status checken

• fail2ban-client status dovecot

Status for the jail: sshd
|- Filter
|  |- Currently failed:	1
|  |- Total failed:	14
|  `- File list:	/var/log/auth.log
`- Actions
   |- Currently banned:	1
   |- Total banned:	1
   `- Banned IP list:	172.31.31.1

Alles unbannen

• fail2ban-client unban --all