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<div id="wb_element_instance1348" class="wb_element" style="left: 0px; top: 0px; width: 1000px; height: auto; min-width: 900px; min-height: 500px;padding-left: 200px ;padding-bottom: 50px; z-index: 299; ">
<h1 class="wb-stl-heading1">SECURITY </h1>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal">Things to be considered before configuring apache server.</p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p></br>
<h2 class="wb-stl-heading2">1.Hiding Apache version and OS information:</h2>
<p> </p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal">Apache displays its version and the name of the operating system in errors. A hacker can use this information to launch an attack. so server administration must hide the server signature. This can be with following command</p>
</br>
<p class="wb-stl-normal"><span style="color:#f10631;">vim /etc/httpd/conf/httpd.conf</span></p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal">>Go to the above directory</p></br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">ServerSignature Off</span></p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal">>Off the default signature</p></br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">service httpd restart</span></p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal">>restart the server to take effect the changes</p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p>
<h3 class="wb-stl-heading3">2.Disable Directory Listing</h3>
<p> </p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal">If /var/www/ don’t have the index file then webserver shows the document root directory</p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal">This feature could be turn off for a specific directory through “options directive” available in the Apache configuration file.</p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"><span style="color:#f10631;"><Directory /var/www/html></span></p>
<p class="wb-stl-normal"><span style="color:#f10631;">Options -Indexes</span></p>
<p class="wb-stl-normal"><span style="color:#f10631;"></Directory></span></p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p></br>
<h2 class="wb-stl-heading2">3.Restricting Access to files outside the root directory</h2>
<p> </p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal">Configure the file like given below:</p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"><span style="color:#f10631;"><Directory/></span></p>
<p class="wb-stl-normal"><span style="color:#f10631;">Options None</span></p>
<p class="wb-stl-normal"><span style="color:#f10631;">AllowOverride None</span></p>
<p class="wb-stl-normal"><span style="color:#f10631;">Order deny,allow</span></p>
<p class="wb-stl-normal"><span style="color:#f10631;">Deny from all</span></p>
<p class="wb-stl-normal"><span style="color:#f10631;"></Directory></span></p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal">This will not allow user to access outside the web root directory</p>
<p> </p>
<p> </p>
<p class="wb-stl-normal"> </p></br>
<h2 class="wb-stl-heading2">HOW TO INSERT RESTRICTION. </h2>
<p> </p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal">To view the current iptables configuration</p>
<p class="wb-stl-normal"><span style="color:#f10631;">iptables -L</span></p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p></br>
<h3 class="wb-stl-heading3">How to block all connections from a specific IP Address.</h3>
<p> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">iptables -A INPUT -s (ip address) -j DROP</span></p>
<p class="wb-stl-normal">e.g.: <span style="color:#f10631;">iptables -A INPUT -s 192.168.1.22 -j DROP</span></p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p></br>
<h3 class="wb-stl-heading3">How to block all of the IP Addresses in the 192.168.1.1/24 network range.</h3>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal">Standard method: <span style="color:#f10631;">iptables -A INPUT -s 192.168.1.1/24 -j DROP</span></p>
<p class="wb-stl-normal">OR</p>
<p class="wb-stl-normal">Netmask method: <span style="color:#f10631;">iptables -A INPUT -s 192.168.1.1/255.255.255.0 -j DROP</span></p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p></br>
<h2 class="wb-stl-heading2">How to block SSH connections from any IP address.</h2>
<p class="wb-stl-normal"> </p>
<p><span style="color:#f10631;">iptables -A INPUT -p tcp --dport ssh -j DROP</span></p>
<p> </p></br>
<h3 class="wb-stl-heading3">How to block SSH connections from a specific IP Address.</h3>
<p> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">iptables -A INPUT -p tcp --dport ssh -s 10.10.10.10 -j DROP</span></p>
<p class="wb-stl-normal">For tcp protocol use <span style="color:#f10631;">-p tcp</span></p>
<p class="wb-stl-normal">& for udp protocol use <span style="color:#f10631;">-p udp</span></p>
<p class="wb-stl-normal"> </p>
</br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal">The changes that you make to your iptables rules will be scrapped the next time that the iptables service gets restarted unless you execute a command to save the changes</p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal">For Ubuntu:</p>
<p class="wb-stl-normal"><span style="color:#f10631;">sudo /sbin/iptables-save</span></p>
<p class="wb-stl-normal"> </p>
</br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal">Red Hat / CentOS:</p>
<p class="wb-stl-normal"><span style="color:#f10631;">/sbin/service iptables save</span></p>
<p class="wb-stl-normal">Or</p>
<p class="wb-stl-normal"><span style="color:#f10631;">/etc/init.d/iptables save</span></p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"><strong>To clear all the currently configured rules:</strong></p>
<p class="wb-stl-normal"><span style="color:#f10631;">iptables -F</span></p>
<p class="wb-stl-normal"> </p>
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