Configure mod_evasive

Configure mod_evasive 2015/08/03

	Enable mod_evasive module to defend from DoS attacks and so on.
[1]	Install and configure mod_evasive.

# install from EPEL [root@www ~]#  yum --enablerepo=epel -y install mod_evasive [root@www ~]#  vi/etc/httpd/conf.d/mod_evasive.conf # line 18: threshhold for the number of requests for the same page per page interval DOSPageCount    5 # line 24: threshhold for the total number of requests for any object by the same client on the same listener per site interval DOSSiteCount    50 # line 28: The interval for the page count threshhold DOSPageInterval    1 # line 32: The interval for the site count threshhold DOSSiteInterval    1 # line 41: amount of time (in seconds) that a client will be blocked for if they are added to the blocking list DOSBlockingPeriod    300 # line 48: notification address if IP address becomes blacklisted DOSEmailNotify    root@localhost # line 66: specify log directory DOSLogDir   " /var/log/mod_evasive " [root@www ~]#  mkdir /var/log/mod_evasive  [root@www ~]#  chown apache. /var/log/mod_evasive  [root@www ~]#  systemctl restart httpd

[2]	Test with a test tool which is included in RPM package.

[root@www ~]#  perl /usr/share/doc/mod_evasive-*/test.pl  HTTP/1.1 200 OK HTTP/1.1 200 OK HTTP/1.1 200 OK HTTP/1.1 200 OK HTTP/1.1 200 OK ..... ..... HTTP/1.1 403 Forbidden HTTP/1.1 403 Forbidden HTTP/1.1 403 Forbidden ..... ..... HTTP/1.1 403 Forbidden # turn to "403 Forbidden" if blocked # logs are saved [root@www ~]#  ll /var/log/mod_evasive  total 4 -rw-r--r-- 1 apache apache 5 Aug 5 15:42 dos-127.0.0.1 # if set notification, it is sent like follows [root@www ~]#  mail  Heirloom Mail version 12.5 7/5/10. Type ? for help. "/var/spool/mail/root": 1 message 1 new >N 1 Apache Wed Aug 3 19:42 20/673 & 1 Message 1: From apache@www.server.world Wed Aug 3 19:42:55 2015 Return-Path: <apache@www.server.world> X-Original-To: root@localhost Delivered-To: root@localhost.server.world Date: Wed, 05 Aug 2015 15:42:54 +0900 To: root@localhost.server.world User-Agent: Heirloom mailx 12.5 7/5/10 Content-Type: text/plain; charset=us-ascii From: apache@www.server.world (Apache) Status: R To: root@localhost Subject: HTTP BLACKLIST 127.0.0.1 mod_evasive HTTP Blacklisted 127.0.0.1