Brute force password discovery attacks involve repeated attempts to authenticate against a service using a dictionary of common passwords. While it is desirable to enforce strong passwords for users this is not always possible and in cases where a weak password has been used brute force attacks can be effective.
The pam_abl module monitors failed authentication attempts and automatically blacklists those hosts (and accounts) that are responsible for large numbers of failed attempts. Once a host is blacklisted it is guaranteed to fail authentication even if the correct credentials are provided.
Blacklisting is triggered when the number of failed authentication attempts in a particular period of time exceeds a predefined limit. Hosts which stop attempting to authenticate will, after a period of time, be un-blacklisted.
Download: Here
Installation:
$ make install
$ cp conf/pam_abl.conf /etc/security
Edit your PAM configuration to include the pam_abl.so module. Here's an example
auth required /lib/security/pam_env.so
auth required /lib/security/pam_abl.so config=/etc/security/pam_abl.conf
auth sufficient /lib/security/pam_unix.so likeauth nullok
auth required /lib/security/pam_deny.so
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source:http://linuxpoison.blogspot.com/2008/06/135781758010991.html