Fail2ban:Community Portal

User Suggestions

Fail2ban is one of the best projects I've encountered - I love it! One suggestion: in 0.7+, the iptables.conf action uses pre-ban command"

iptables -L....

Is there a reason for this? Maybe ip spoofing? At any rate, this can cause fail2ban to take forever in implementing its actions if the iptables chains are big, because it causes DNS lookups for each entry. I suggest adding the "n" flag to the command, to speed things up, like this:

iptables -nL....

See:

netfilter FAQ: iptables -L takes a very long time to display the rules

and

Docunext: fail2ban iptable.conf action

---

Thank you. Added in the repository. --Lostcontrol 13:21, 14 December 2006 (PST)

Regexp for vsftp&qpopper/RHEL4

I hope this is the right place to submit fail2ban regexp, and hope this not too much trivial and wring. Here is the section of fail2ban dedicated to VSFTPD and Qpopper according to a RHEL4 standard config:

[VSFTPD]
enabled = true
port = ftp
logfile = /var/log/messages
timeregex = \S{3}\s{1,2}\d{1,2} \d{2}:\d{2}:\d{2}
timepattern = %%b %%d %%H:%%M:%%S
failregex = vsftpd.*authentication failure

[qpopper]
enabled = true
port = pop3
logfile = /var/log/secure
timeregex = \S{3}\s{1,2}\d{1,2} \d{2}:\d{2}:\d{2}
timepattern = %%b %%d %%H:%%M:%%S
failregex = FAIL.*pop3

-- Vincent

Details in mail report

This would be fine if some details were reported in the mail sent by fail2ban when banning ip's:

• report reverse DNS lookup of the ip attacker
• report the usernames used for the attacks
• report hour and minutes ...

--Vincent

Misc suggestions

• allow some ip (ranges) to fail authentification more than the maxfailures value but with a finite number of auth failures (something between whitelisting (through ignoreip value) with an infinite number of auth failures and the rest)
• when banning an ip because of attacking a service, ban it for all the other services monitored by fail2ban
• wiki pages with fail2ban config section related to various services and linux distributions

--Vincent (cosmotroll ---- yahoo / fr)