On Mon, 21 May 2007, Matthew Schumacher wrote:
List, I'm getting some spammer trying to guess usernames and passwords: May 21 11:01:55 larry pop3[5845]: badlogin: [83.209.35.32] plaintext bob SASL(-13): authentication failure: checkpass failed May 21 11:01:54 larry pop3[5860]: badlogin: [83.209.35.32] plaintext complaints SASL(-13): authentication failure: checkpass failed May 21 11:01:56 larry pop3[5922]: badlogin: [83.209.35.32] plaintext diablo SASL(-13): authentication failure: checkpass failed May 21 11:01:58 larry pop3[5924]: badlogin: [83.209.35.32] plaintext darren SASL(-13): authentication failure: checkpass failed May 21 11:02:00 larry pop3[5927]: badlogin: [83.209.35.32] plaintext dallas SASL(-13): authentication failure: checkpass failed May 21 11:02:00 larry pop3[5939]: badlogin: [83.209.35.32] plaintext edgar SASL(-13): authentication failure: checkpass failed May 21 11:02:01 larry pop3[5945]: badlogin: [83.209.35.32] plaintext cristopher SASL(-13): authentication failure: checkpass failed May 21 11:02:02 larry pop3[5965]: badlogin: [83.209.35.32] plaintext easter SASL(-13): authentication failure: checkpass failed May 21 11:02:10 larry pop3[5964]: badlogin: [83.209.35.32] plaintext felicia SASL(-13): authentication failure: checkpass failed And this spammer is racking up a zillion processes which is killing my machine. I need a way to throttle this somehow where he is only allowed one connection per IP at a time, or perhaps a way to ignore them after so many invalid passwords. Anyone know of a way to do this?
You can use tcp-wrappers to block connections from that IP address entirely. I believe there are also some solutions to monitor connections and automatically add IP addresses to the /etc/hosts.deny file, but I've never used them myself.
Andy ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
