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__ _ _ ___ _ / _|__ _(_) |_ ) |__ __ _ _ _ | _/ _` | | |/ /| '_ \/ _` | ' \ |_| \__,_|_|_/___|_.__/\__,_|_||_| ============================================================= Fail2Ban (version 0.4.1) 06/30/2005 ============================================================= Fail2Ban scans log files like /var/log/pwdfail and bans IP that makes too many password failures. It updates firewall rules to reject the IP address. Currently iptables, ipfw and ipfwadm are supported. Fail2Ban can read multiple log files such as sshd or Apache web server ones. It needs log4py. This is my first Python program. Moreover, English is not my mother tongue... More details: ------------- Fail2Ban is rather simple. I have a home server connected to the Internet which runs apache, samba, sshd, ... I see in my logs that people are trying to log into my box using "manual" brute force or scripts. They try 10, 20 and sometimes more user/password (without success anyway). In order to discourage these script kiddies, I wanted that sshd refuse login from a specific ip after 3 password failures. After some Google searches, I found that sshd was not able of that. So I search for a script or program that do it. I found nothing :-( So I decide to write mine and to learn Python :-) For each sections defined in the configuration file, Fail2Ban tries to find lines which match the failregex. Then it retrieves the message time using timeregex and timepattern. It finally gets the ip and if it has already done 3 or more password failures in the last banTime, the ip is banned for banTime using a firewall rule. After banTime, the rule is deleted. Notice that if no "plain" ip is available, Fail2Ban try to do DNS lookup in order to found one or several ip's to ban. Sections can be freely added so it is possible to monitor several daemons at the same time. Runs on my server and does its job rather well :-) The idea is to make fail2ban usable with daemons and services that require a login (sshd, telnetd, ...). It should also support others firewalls than iptables. Installation: ------------- Require: python-2.3 (http://www.python.org) log4py-1.1 (http://sourceforge.net/projects/log4py) To install, just do: > tar xvfj fail2ban-0.4.1.tar.bz2 > cd fail2ban-0.4.1 > python setup.py install This will install Fail2Ban into /usr/lib/fail2ban. The fail2ban.py executable is placed into /usr/bin. For Gentoo users, an ebuild is available on the website. Fail2Ban should now be correctly installed. Just type: > fail2ban.py -h to see if everything is alright. You can configure fail2ban with a config file. Copy config/fail2ban.conf.default to /etc/fail2ban.conf. Gentoo users can use the initd script available in config/. Copy gentoo-initd to /etc/init.d/fail2ban and gentoo-confd to /etc/conf.d/fail2ban. You can start fail2ban and add it to your default runlevel: > /etc/init.d/fail2ban start > rc-update add fail2ban default Configuration: -------------- You can configure fail2ban using the file /etc/fail2ban.conf or using command line options. Command line options override the value stored in fail2ban.conf. Here are the command line options: -b start fail2ban in background -d start fail2ban in debug mode -e <INTF> ban IP on the INTF interface -c <FILE> read configuration file FILE -p <FILE> create PID lock in FILE -h display this help message -i <IP(s)> IP(s) to ignore -k kill a currently running Fail2Ban instance -l <FILE> log message in FILE -r <VALUE> allow a max of VALUE password failure -t <TIME> ban IP for TIME seconds -v verbose. Use twice for greater effect -w <FIWA> select the firewall to use. Can be iptables, ipfwadm or ipfw Contact: -------- You need some new features, you found bugs or you just appreciate this program, you can contact me at : Website: http://www.sourceforge.net/projects/fail2ban Cyril Jaquier: <email@example.com> Thanks: ------- Kévin Drapel, Marvin Rouge, Sireyessire, Robert Edeker, Tom Pike, Iain Lea License: -------- Fail2Ban is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. Fail2Ban is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Fail2Ban; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA