Re: under some kind of attack

On 20.07.2017 12:16, mj wrote:

Hi all,

If I may, one more question on this subject:

I would like to create a fail2ban filer, that scans for these lines:

...

Jul 20 11:10:09 auth: Info: ldap(user1,60.166.35.162,<cDFXHbxUQgA8piOi>): invalid credentials (given password: password) Jul 20 11:10:19 auth: Info: ldap(user2,61.53.66.4,): invalid credentials (given password: password)

(as you can see, I have enabled auth_verbose_passwords to do this, making me very uncomfortable...)

Anyway: since there are only a few password variations, I would like to block anyone using those passwords.

(since the connections are over TLS/SSL, I cannot use iptables, as suggested earlier)

So I need a specific fail2ban rule that extracts the <IP> from that line, and matches on "(given password: password)"

Can anyone here help out with a failregex line that would match..?

You could use https://github.com/PowerDNS/weakforced here. It lets you execute arbitrary actions in addition to just outright blocking the users.

Aki