nano /etc/fail2ban/jail.conf

# Fail2Ban configuration file.

#

# This file was composed for Debian systems from the original one

#  provided now under /usr/share/doc/fail2ban/examples/jail.conf

#  for additional examples.

#

# To avoid merges during upgrades DO NOT MODIFY THIS FILE

# and rather provide your changes in /etc/fail2ban/jail.local

#

# Author: Yaroslav O. Halchenko <debian@onerussian.com>

#

# $Revision$

#

# The DEFAULT allows a global definition of the options. They can be overridden

# in each jail afterwards.

[DEFAULT]

# 여기가 기준입니다. maxretry 같은 경우는 각 항목에 넣으면 그것이 기준이 됩니다.

# "ignoreip" can be an IP address, a CIDR mask or a DNS host

ignoreip = 127.0.0.1/8

ignoreip = 자신의외부아이피넣기

bantime  = 600

maxretry = 3

#bantime  = 기준은 초 단위입니다. 600이면 600초 = 10분

#maxretry  = 3번 틀리면 밴 들어가는 겁니다.

# "backend" specifies the backend used to get files modification. Available

# options are "gamin", "polling" and "auto".

# yoh: For some reason Debian shipped python-gamin didn't work as expected

#      This issue left ToDo, so polling is default backend for now

backend = gamin   

# 데비안에서 잘 안될수도 있지만 전 잘되더군요.

#

# Destination email address used solely for the interpolations in

# jail.{conf,local} configuration files.

destemail = root@localhost

#

# ACTIONS

#

# Default banning action (e.g. iptables, iptables-new,

# iptables-multiport, shorewall, etc) It is used to define

# action_* variables. Can be overridden globally or per

# section within jail.local file

banaction = iptables-multiport

# email action. Since 0.8.1 upstream fail2ban uses sendmail

# MTA for the mailing. Change mta configuration parameter to mail

# if you want to revert to conventional 'mail'.

mta = sendmail

# Default protocol

protocol = tcp

# Specify chain where jumps would need to be added in iptables-* actions

chain = INPUT

#

# Action shortcuts. To be used to define action parameter

# The simplest action to take: ban only

action_ = %(banaction)s[name=%(__name__)s, port="%(port)s", protocol="%(protocol)s", chain="%(chain)s"]

# ban & send an e-mail with whois report to the destemail.

action_mw = %(banaction)s[name=%(__name__)s, port="%(port)s", protocol="%(protocol)s", chain="%(chain)s"]

              %(mta)s-whois[name=%(__name__)s, dest="%(destemail)s", protocol="%(protocol)s", chain="%(chain)s"]

# ban & send an e-mail with whois report and relevant log lines

# to the destemail.

action_mwl = %(banaction)s[name=%(__name__)s, port="%(port)s", protocol="%(protocol)s", chain="%(chain)s"]

               %(mta)s-whois-lines[name=%(__name__)s, dest="%(destemail)s", logpath=%(logpath)s, chain="%(chain)s"]

# Choose default action.  To change, just override value of 'action' with the

# interpolation to the chosen action shortcut (e.g.  action_mw, action_mwl, etc) in jail.local

# globally (section [DEFAULT]) or per specific section

action = %(action_)s

#

# JAILS

#

# Next jails corresponds to the standard configuration in Fail2ban 0.6 which

# was shipped in Debian. Enable any defined here jail by including

#

# [SECTION_NAME]

# enabled = true

#

# in /etc/fail2ban/jail.local.

#

# Optionally you may override any other parameter (e.g. banaction,

# action, port, logpath, etc) in that section within jail.local

[ssh]

enabled  = true

port     = ssh

filter   = sshd

logpath  = /var/log/auth.log

maxretry = 6

#ssh의 접속을 막는 부분입니다. 다른 것은 만질 필요없고, maxretry만 수정하셔도 됩니다.

[dropbear]

enabled  = false

port     = ssh

filter   = sshd

logpath  = /var/log/dropbear

maxretry = 6

# Generic filter for pam. Has to be used with action which bans all ports

# such as iptables-allports, shorewall

[pam-generic]

enabled  = false

# pam-generic filter can be customized to monitor specific subset of 'tty's

filter   = pam-generic

# port actually must be irrelevant but lets leave it all for some possible uses

port     = all

banaction = iptables-allports

port     = anyport

logpath  = /var/log/auth.log

maxretry = 6

[xinetd-fail]

enabled   = false

filter    = xinetd-fail

port      = all

banaction = iptables-multiport-log

logpath   = /var/log/daemon.log

maxretry  = 2

[ssh-ddos]

enabled  = true

port     = ssh

filter   = sshd-ddos

logpath  = /var/log/auth.log

maxretry = 6

# 저는 이쪽도 추가해줬습니다. ddos를 막는 것 같은 느낌이 드는군요.

#

# HTTP servers

#

[apache]

enabled  = false

port     = http,https

filter   = apache-auth

logpath  = /var/log/apache*/*error.log

maxretry = 6

# default action is now multiport, so apache-multiport jail was left

# for compatibility with previous (<0.7.6-2) releases

[apache-multiport]

enabled   = false

port      = http,https

filter    = apache-auth

logpath   = /var/log/apache*/*error.log

maxretry  = 6

[apache-noscript]

enabled  = false

port     = http,https

filter   = apache-noscript

logpath  = /var/log/apache*/*error.log

maxretry = 6

[apache-overflows]

enabled  = false

port     = http,https

filter   = apache-overflows

logpath  = /var/log/apache*/*error.log

maxretry = 2

#

# FTP servers

#

[vsftpd]

enabled  = true

port     = ftp,ftp-data,ftps,ftps-data

filter   = vsftpd

logpath  = /var/log/vsftpd.log

# or overwrite it in jails.local to be

# logpath = /var/log/auth.log

# if you want to rely on PAM failed login attempts

# vsftpd's failregex should match both of those formats

maxretry = 6

#vsftpd를 쓰는 사람은 여기가 필수겠죠

[proftpd]

enabled  = false

port     = ftp,ftp-data,ftps,ftps-data

filter   = proftpd

logpath  = /var/log/proftpd/proftpd.log

maxretry = 6

[pure-ftpd]

enabled  = false

port     = ftp,ftp-data,ftps,ftps-data

filter   = pure-ftpd

logpath  = /var/log/auth.log

maxretry = 6

[wuftpd]

enabled  = false

port     = ftp,ftp-data,ftps,ftps-data

filter   = wuftpd

logpath  = /var/log/auth.log

maxretry = 6

#

# Mail servers

#

[postfix]

enabled  = false

port     = smtp,ssmtp

filter   = postfix

logpath  = /var/log/mail.log

[couriersmtp]

enabled  = false

port     = smtp,ssmtp

filter   = couriersmtp

logpath  = /var/log/mail.log

#

# Mail servers authenticators: might be used for smtp,ftp,imap servers, so

# all relevant ports get banned

#

[courierauth]

enabled  = false

port     = smtp,ssmtp,imap2,imap3,imaps,pop3,pop3s

filter   = courierlogin

logpath  = /var/log/mail.log

[sasl]

enabled  = false

port     = smtp,ssmtp,imap2,imap3,imaps,pop3,pop3s

filter   = sasl

# You might consider monitoring /var/log/mail.warn instead if you are

# running postfix since it would provide the same log lines at the

# "warn" level but overall at the smaller filesize.

logpath  = /var/log/mail.log

[dovecot]

enabled = false

port    = smtp,ssmtp,imap2,imap3,imaps,pop3,pop3s

filter  = dovecot

logpath = /var/log/mail.log

# DNS Servers

# 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

# !!! WARNING !!!

#   Since UDP is connection-less protocol, spoofing of IP and imitation

#   of illegal actions is way too simple.  Thus enabling of this filter

#   might provide an easy way for implementing a DoS against a chosen

#   victim. See

#    http://nion.modprobe.de/blog/archives/690-fail2ban-+-dns-fail.html

#   Please DO NOT USE this jail unless you know what you are doing.

#[named-refused-udp]

#

#enabled  = false

#port     = domain,953

#protocol = udp

#filter   = named-refused

#logpath  = /var/log/named/security.log

[named-refused-tcp]

enabled  = false

port     = domain,953

protocol = tcp

filter   = named-refused

logpath  = /var/log/named/security.log

service fail2ban restart

iptables -nvL