[root@Centos6 ~]# rpm -ivh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-5.noarch.rpm
Retrieving http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-5.noarch.rpm
warning: /var/tmp/rpm-tmp.cINFQK: Header V3 RSA/SHA256 Signature, key ID 0608b895: NOKEY
Preparing... ########################################### [100%]
1:epel-release ########################################### [100%]
[root@Centos6 ~]# yum install fail2ban
Loaded plugins: fastestmirror
Determining fastest mirrors
epel/metalink | 2.2 kB 00:00
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=i386&repo=extras error was
12: Timeout on http://mirrorlist.centos.org/?release=6&arch=i386&repo=extras: (28, '')
* base: mirror.neu.edu.cn
* epel: mirror01.idc.hinet.net
* extras: mirror.neu.edu.cn
* updates: mirror.neu.edu.cn
base | 3.7 kB 00:00
epel | 4.0 kB 00:01
epel/primary_db | 3.5 MB 00:27
extras | 3.5 kB 00:00
updates | 3.5 kB 00:00
updates/primary_db | 1.7 MB 00:03
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package fail2ban.noarch 0:0.8.4-24.el6 set to be updated
--> Processing Dependency: shorewall for package: fail2ban-0.8.4-24.el6.noarch
--> Processing Dependency: gamin-python for package: fail2ban-0.8.4-24.el6.noarch
--> Running transaction check
---> Package gamin-python.i686 0:0.1.10-9.el6 set to be updated
---> Package shorewall.noarch 0:4.4.23.3-1.el6 set to be updated
--> Finished Dependency Resolution
Dependencies Resolved
=======================================================================================================================================================================
Package Arch Version Repository Size
=======================================================================================================================================================================
Installing:
fail2ban noarch 0.8.4-24.el6 epel 125 k
Installing for dependencies:
gamin-python i686 0.1.10-9.el6 base 33 k
shorewall noarch 4.4.23.3-1.el6 epel 541 k
Transaction Summary
=======================================================================================================================================================================
Install 3 Package(s)
Upgrade 0 Package(s)
Total download size: 699 k
Installed size: 2.6 M
Is this ok [y/N]: y
Downloading Packages:
(1/3): fail2ban-0.8.4-24.el6.noarch.rpm | 125 kB 00:00
(2/3): gamin-python-0.1.10-9.el6.i686.rpm | 33 kB 00:00
(3/3): shorewall-4.4.23.3-1.el6.noarch.rpm | 541 kB 00:01
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 253 kB/s | 699 kB 00:02
warning: rpmts_HdrFromFdno: Header V3 RSA/SHA256 Signature, key ID 0608b895: NOKEY
epel/gpgkey | 3.2 kB 00:00 ...
Importing GPG key 0x0608B895 "EPEL (6)
Is this ok [y/N]: y
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
Installing : shorewall-4.4.23.3-1.el6.noarch 1/3
Installing : gamin-python-0.1.10-9.el6.i686 2/3
Installing : fail2ban-0.8.4-24.el6.noarch 3/3
Installed:
fail2ban.noarch 0:0.8.4-24.el6
Dependency Installed:
gamin-python.i686 0:0.1.10-9.el6 shorewall.noarch 0:4.4.23.3-1.el6
Complete!
[root@Centos6 ~]# service fail2ban start
Starting fail2ban: [ OK ]
[root@Centos6 ~]# cd /etc/fail2ban/
[root@Centos6 fail2ban]# ls
action.d fail2ban.conf filter.d jail.conf
[root@Centos6 fail2ban]# cat fail2ban.conf
# Fail2Ban configuration file
#
# Author: Cyril Jaquier
#
# $Revision: 629 $
#
[Definition]
# Option: loglevel
# Notes.: Set the log level output.
# 1 = ERROR
# 2 = WARN
# 3 = INFO
# 4 = DEBUG
# Values: NUM Default: 3
#
loglevel = 3
# Option: logtarget
# Notes.: Set the log target. This could be a file, SYSLOG, STDERR or STDOUT.
# Only one log target can be specified.
# Values: STDOUT STDERR SYSLOG file Default: /var/log/fail2ban.log
#
logtarget = SYSLOG
# Option: socket
# Notes.: Set the socket file. This is used to communicate with the daemon. Do
# not remove this file when Fail2ban runs. It will not be possible to
# communicate with the server afterwards.
# Values: FILE Default: /var/run/fail2ban/fail2ban.sock
#
socket = /var/run/fail2ban/fail2ban.sock
[root@Centos6 fail2ban]# ls
action.d fail2ban.conf filter.d jail.conf
[root@Centos6 fail2ban]# cat jail.conf
# Fail2Ban configuration file
#
# Author: Cyril Jaquier
#
# $Revision: 747 $
#
# The DEFAULT allows a global definition of the options. They can be override
# in each jail afterwards.
[DEFAULT]
# "ignoreip" can be an IP address, a CIDR mask or a DNS host. Fail2ban will not
# ban a host which matches an address in this list. Several addresses can be
# defined using space separator.
ignoreip = 127.0.0.1
# "bantime" is the number of seconds that a host is banned.
bantime = 600
# A host is banned if it has generated "maxretry" during the last "findtime"
# seconds.
findtime = 600
# "maxretry" is the number of failures before a host get banned.
maxretry = 3
# "backend" specifies the backend used to get files modification. Available
# options are "gamin", "polling" and "auto". This option can be overridden in
# each jail too (use "gamin" for a jail and "polling" for another).
#
# gamin: requires Gamin (a file alteration monitor) to be installed. If Gamin
# is not installed, Fail2ban will use polling.
# polling: uses a polling algorithm which does not require external libraries.
# auto: will choose Gamin if available and polling otherwise.
backend = auto
# This jail corresponds to the standard configuration in Fail2ban 0.6.
# The mail-whois action send a notification e-mail with a whois request
# in the body.
[ssh-iptables]
enabled = true
filter = sshd
action = iptables[name=SSH, port=ssh, protocol=tcp]
sendmail-whois[name=SSH, dest=root, [email protected]]
logpath = /var/log/secure
maxretry = 5
[proftpd-iptables]
enabled = false
filter = proftpd
action = iptables[name=ProFTPD, port=ftp, protocol=tcp]
sendmail-whois[name=ProFTPD, [email protected]]
logpath = /var/log/proftpd/proftpd.log
maxretry = 6
# This jail forces the backend to "polling".
[sasl-iptables]
enabled = false
filter = sasl
backend = polling
action = iptables[name=sasl, port=smtp, protocol=tcp]
sendmail-whois[name=sasl, [email protected]]
logpath = /var/log/mail.log
# Here we use TCP-Wrappers instead of Netfilter/Iptables. "ignoreregex" is
# used to avoid banning the user "myuser".
[ssh-tcpwrapper]
enabled = false
filter = sshd
action = hostsdeny
sendmail-whois[name=SSH, [email protected]]
ignoreregex = for myuser from
logpath = /var/log/sshd.log
# This jail demonstrates the use of wildcards in "logpath".
# Moreover, it is possible to give other files on a new line.
[apache-tcpwrapper]
enabled = false
filter = apache-auth
action = hostsdeny
logpath = /var/log/apache*/*error.log
/home/www/myhomepage/error.log
maxretry = 6
# The hosts.deny path can be defined with the "file" argument if it is
# not in /etc.
[postfix-tcpwrapper]
enabled = false
filter = postfix
action = hostsdeny[file=/not/a/standard/path/hosts.deny]
sendmail[name=Postfix, [email protected]]
logpath = /var/log/postfix.log
bantime = 300
# Do not ban anybody. Just report information about the remote host.
# A notification is sent at most every 600 seconds (bantime).
[vsftpd-notification]
enabled = false
filter = vsftpd
action = sendmail-whois[name=VSFTPD, [email protected]]
logpath = /var/log/vsftpd.log
maxretry = 5
bantime = 1800
# Same as above but with banning the IP address.
[vsftpd-iptables]
enabled = false
filter = vsftpd
action = iptables[name=VSFTPD, port=ftp, protocol=tcp]
sendmail-whois[name=VSFTPD, [email protected]]
logpath = /var/log/vsftpd.log
maxretry = 5
bantime = 1800
# Ban hosts which agent identifies spammer robots crawling the web
# for email addresses. The mail outputs are buffered.
[apache-badbots]
enabled = false
filter = apache-badbots
action = iptables-multiport[name=BadBots, port="http,https"]
sendmail-buffered[name=BadBots, lines=5, [email protected]]
logpath = /var/www/*/logs/access_log
bantime = 172800
maxretry = 1
# Use shorewall instead of iptables.
[apache-shorewall]
enabled = false
filter = apache-noscript
action = shorewall
sendmail[name=Postfix, [email protected]]
logpath = /var/log/apache2/error_log
# Ban attackers that try to use PHP's URL-fopen() functionality
# through GET/POST variables. - Experimental, with more than a year
# of usage in production environments.
[php-url-fopen]
enabled = false
port = http,https
filter = php-url-fopen
logpath = /var/www/*/logs/access_log
maxretry = 1
# A simple PHP-fastcgi jail which works with lighttpd.
# If you run a lighttpd server, then you probably will
# find these kinds of messages in your error_log:
# ALERT – tried to register forbidden variable ‘GLOBALS’
# through GET variables (attacker '1.2.3.4', file '/var/www/default/htdocs/index.php')
# This jail would block the IP 1.2.3.4.
[lighttpd-fastcgi]
enabled = false
port = http,https
filter = lighttpd-fastcgi
# adapt the following two items as needed
logpath = /var/log/lighttpd/error.log
maxretry = 2
# This jail uses ipfw, the standard firewall on FreeBSD. The "ignoreip"
# option is overridden in this jail. Moreover, the action "mail-whois" defines
# the variable "name" which contains a comma using "". The characters '' are
# valid too.
[ssh-ipfw]
enabled = false
filter = sshd
action = ipfw[localhost=192.168.0.1]
sendmail-whois[name="SSH,IPFW", [email protected]]
logpath = /var/log/auth.log
ignoreip = 168.192.0.1
# These jails block attacks against named (bind9). By default, logging is off
# with bind9 installation. You will need something like this:
#
# logging {
# channel security_file {
# file "/var/log/named/security.log" versions 3 size 30m;
# severity dynamic;
# print-time yes;
# };
# category security {
# security_file;
# };
# };
#
# in your named.conf to provide proper logging.
# This jail blocks UDP traffic for DNS requests.
[named-refused-udp]
enabled = false
filter = named-refused
action = iptables-multiport[name=Named, port="domain,953", protocol=udp]
sendmail-whois[name=Named, [email protected]]
logpath = /var/log/named/security.log
ignoreip = 168.192.0.1
# This jail blocks TCP traffic for DNS requests.
[named-refused-tcp]
enabled = false
filter = named-refused
action = iptables-multiport[name=Named, port="domain,953", protocol=tcp]
sendmail-whois[name=Named, [email protected]]
logpath = /var/log/named/security.log
ignoreip = 168.192.0.1
[root@Centos6 fail2ban]# service fail2ban status
Fail2ban (pid 2226) is running...
Status
|- Number of jail: 1
`- Jail list: ssh-iptables
[root@Centos6 fail2ban]# cat /var/log/
anaconda.log ConsoleKit/ sa/
anaconda.program.log cron samba/
anaconda.storage.log cron-20120211 secure
anaconda.syslog dmesg secure-20120211
anaconda.xlog dmesg.old spooler
anaconda.yum.log lastlog spooler-20120211
audit/ maillog tallylog
boot.log maillog-20120211 wtmp
boot.log-20120211 messages yum.log
btmp messages-20120211 yum.log-20120211
btmp-20120211 prelink/
[root@Centos6 fail2ban]# iptables -L -vxn
Chain INPUT (policy ACCEPT 195 packets, 14960 bytes)
pkts bytes target prot opt in out source destination
195 14960 fail2ban-SSH tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 157 packets, 23536 bytes)
pkts bytes target prot opt in out source destination
Chain fail2ban-SSH (1 references)
pkts bytes target prot opt in out source destination
195 14960 RETURN all -- * * 0.0.0.0/0 0.0.0.0/0
[root@Centos6 fail2ban]#
