Eu instalei o fail2ban com odoo 13.
Abaixo estão minha configuração e amostra de saída, mas não consigo entender por que ela não é filtrada.
user@tempdev:/etc/fail2ban# fail2ban-regex -v /var/log/odoo/odoo.log /etc/fail2ban/filter.d/odoo-login.conf
Running tests
=============
Use failregex filter file : odoo-login, basedir: /etc/fail2ban
Use log file : /var/log/odoo/odoo.log
Use encoding : UTF-8
Results
=======
Failregex: 0 total
|- #) [# of hits] regular expression
| 1) [0] ^\d+ INFO \S+ \S+ Login failed for db:\S+ login:\S+ from <HOST>
`-
usuário@tempdev:/etc/fail2ban# cat /var/log/odoo/odoo.log | grep 'Falha no login'
2020-12-11 12:54:06,442 1620 INFO TestSRV odoo.addons.base.models.res_users: Login failed for db:TestSRV login:asfd from 1.2.23.3
2020-12-11 13:11:20,945 1620 INFO TestSRV odoo.addons.base.models.res_users: Login failed for db:TestSRV login:asfd from 1.2.23.3
2020-12-11 13:12:07,928 1620 INFO TestSRV odoo.addons.base.models.res_users: Login failed for db:TestSRV login:asdf from 1.2.23.3
Responder1
Fail2ban certamente corta a parte da string correspondente ao datepattern, mas ainda resta um espaço, então você deve adicionar \s*após a âncora antes \d+:
-failregex = ^\d+ INFO \S+ \S+ Login failed for db:\S+ login:\S+ from <HOST>
+failregex = ^\s*\d+ INFO \S+ \S+ Login failed for db:\S+ login:\S+ from <HOST>