ip scanning and ftp probing

andy1974 · 03-13-2008, 04:37 PM

ok i need some help blocking certain ips from trying to access my ftp server. i have like 3 ips that keep trying to access my ftp server, using a script trying diffrent username and password combanations. is there a way of just blocking those ips from accesssing the server at all ?

acid_kewpie · 03-13-2008, 05:09 PM

may i suggest a slightly more comprehensive approach?
http://www.fail2ban.org/wiki/index.php/Vsftpd
http://www.fail2ban.org/wiki/index.php/ProFTPd

andy1974 · 03-14-2008, 06:18 AM

OK.......ummmm what exactly am i looking for in that link? and Yes i have ProFTP

acid_kewpie · 03-14-2008, 06:22 AM

you're looking to install fail2ban.

andy1974 · 03-14-2008, 06:24 AM

OK.......ummmm what exactly am i looking for in that link? and Yes i have ProFTP

# Fail2Ban configuration file
#
# Author: Yaroslav Halchenko
#
# $Revision: 510 $
#

[Definition]

# Option: failregex
# Notes.: regex to match the password failures messages in the logfile. The
# host must be matched by a group named "host". The tag "<HOST>" can
# be used for standard IP/hostname matching and is only an alias for
# (?:::f{4,6}

?(?P<host>\S+)
# Values: TEXT
#
failregex = USER \S+: no such user found from \S* ?\[<HOST>\] to \S+\s*$

# Option: ignoreregex
# Notes.: regex to ignore. If this regex matches, the line is ignored.
# Values: TEXT
#
ignoreregex =

andy1974 · 03-14-2008, 06:27 AM

ok i see, looking at fail2ban.org now

andy1974 · 03-14-2008, 06:34 AM

ok ....installed the rpm , now just need to find out how to work it

acid_kewpie · 03-14-2008, 06:39 AM

TBH, looking at those links, they aren't *actually* that useful are they? Are you clear on what fail2ban will do for you? should just take all the specifics like ip addresses away from attackers, and continualy block attackers as and when they come in from wherever.

andy1974 · 03-14-2008, 08:53 AM

its ok ...yea i see what is does now

, i am looking at the docs for it now, making sure i have it set up correctly

CarLost · 03-14-2008, 10:26 AM

I use this

Code:

iptables -A INPUT -p tcp -i eth1.15 --dport 21 -m state --state NEW,INVALID -m recent --name BadGuy --set
iptables -A INPUT -p tcp -i eth1.15 --dport 21 -m state --state NEW,INVALID -m recent --seconds 60 --hitcount 3 --name BadGuy --update -j DROP

BEFORE the STABLISH,RELATED accept rule

and work just OK

andy1974 · 03-24-2008, 08:43 PM

well i download and install the fail2ban, how ever i need some help configing it properly. whould there be anyone willing to help assist me ?

Tux-Slack · 03-25-2008, 05:01 AM

Brute force...Install blockhosts, configure it and run it. Then you should be good against those attacks.

acid_kewpie · 03-25-2008, 06:16 AM

well we're already heading down one valid path, wouldn't change that for no reason... not seen blockhosts myself, doesn't look nearly as versatile as fail2ban. what problems are you actually having with fail2ban?

andy1974 · 03-26-2008, 08:06 AM

well i did finnaly got it configed correctly and seems to be working at this time. i did get a email saying that it did ban a ip for unsecsessfull login attemps. I did change the allowed attempt times. Next question i have. i take it it will unban the ip after a certain amount of time, so i am looking for that.

andy1974 · 03-27-2008, 08:36 AM

OK, wanted to give an update. Fail2ban has been working great for a few days now jailing threat ips. Thanks for your help Great script!!