Hi Jayesh , Am Samstag, den 17.10.2015, 13:06 +0530 schrieb Jayesh Shinde: > Hello all , > > I am having mailserver with centos 6.3 + cyrus-imad + postfix + ldap > We are using cyrus-sasl-2.1.23-13.el6.x86_64 with 'PAM' Mechanism . > > Many spammer are trying to hack password for doing many authentication > with pop3 + imap + smtp services. > on server Fail2ban hass been added , but its blocking hacker IPs > after certain interval and not in real time. Which is the actual > issue. > > I am looking for some real-time blocking where that particular > spammer IP + email id must get block . I'm using fail2ban too and I don't understand what you mean by "real time". In my configuration the ban is set immediately after three failed logins (no delay) and for more extended banning of persistent abusers I use the recidive filter. > I believe this issue is very common with other too , is there any > option in 'saslauthd' / postfix / cyrus-imapd for below > requirement ? > > 1) If server receive the wrong password , then is it possible to > introduce the delay of say 5-10 seconds to sender client ? So that > spammer will do less attempt ? > 2) After given wrong password attempt more than 3 time , the > particular "IP + email id" must get block for next 5-10 min. > And then need to unblock after that. > 3) I check PAM-ABL , but its not working for 'saslauthd'' with pop / > imap / smtp . Because I came to know that 'saslauthd'' is not getting > IP of source . > How to pass source IP to "saslauthd'' along with email id , password > and relam . Is there any patch available for this ? > Ciao!
