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How to install dotProject on CentOS 7

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<h1 style="box-sizing: border-box; font-family: Raleway, Helvetica, Arial, sans-serif; font-size: 33px; font-weight: 500; line-height: 46px; margin: 0px 0px 8px;">
Install dotProject on CentOS</h1>
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dotProject is a web-based, multi-user, multi-language project management application. It is free and open source software, and is maintained by an open community of volunteer programmers.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgqm1AUy0QwKk_rkaVJPqy-Ox8KlGWn6m5GVfUTMSaANUgGkb45_Ve8RWjjbPWGOSfwKh-UPwN5-vAQwbyfiKZuBNI-D7pLAnHyiEmZPIMOa6gqKKWr2k5Xsu1kVbwGy3OsYmCpuYn-YyN1/s1600/dotproject_hackthesec.co.in.gif" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgqm1AUy0QwKk_rkaVJPqy-Ox8KlGWn6m5GVfUTMSaANUgGkb45_Ve8RWjjbPWGOSfwKh-UPwN5-vAQwbyfiKZuBNI-D7pLAnHyiEmZPIMOa6gqKKWr2k5Xsu1kVbwGy3OsYmCpuYn-YyN1/s1600/dotproject_hackthesec.co.in.gif" /></a></div>
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INSTALLATION:-</div>
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As a system administrator will always update the system to the latest stable status:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">sudo yum update -y
sudo reboot</pre>
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In order to serve dotProject, you need to deploy the <a href="http://www.hackthesec.co.in/search/label/LAMP" target="_blank">LAMP stack</a> on your machine. </div>
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You need to install Apache, the only officially supported web server program, on your system:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">sudo yum install httpd
sudo systemctl start httpd.service
sudo systemctl enable httpd.service</pre>
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Remove Apache's default welcome page by commenting out the content of the file welcome.conf:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">sudo vi /etc/httpd/conf.d/welcome.conf</pre>
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Use # to comment out every line.</div>
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<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">#
# This configuration file enables the default "Welcome" page if there
# is no default index page present for the root URL. To disable the
# Welcome page, comment out all the lines below.
#
# NOTE: if this file is removed, it will be restored on upgrades.
#
#<LocationMatch "^/+$">
# Options -Indexes
# ErrorDocument 403 /.noindex.html
#</LocationMatch>
# 
#<Directory /usr/share/httpd/noindex>
# AllowOverride None
# Require all granted
#</Directory>
# 
#Alias /.noindex.html /usr/share/httpd/noindex/index.html
#Alias /noindex/css/bootstrap.min.css /usr/share/httpd/noindex/css/bootstrap.min.css
#Alias /noindex/css/open-sans.css /usr/share/httpd/noindex/css/open-sans.css
#Alias /images/apache_pb.gif /usr/share/httpd/noindex/images/apache_pb.gif
#Alias /images/poweredby.png /usr/share/httpd/noindex/images/poweredby.png</pre>
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Save and quit with :wq!</div>
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Prevent Apache from displaying files in directories:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">sudo vi /etc/httpd/conf/httpd.conf</pre>
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Replace:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">Options Indexes FollowSymLinks</pre>
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With:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">Options FollowSymLinks</pre>
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Save and quit with :wq!</div>
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Before you can visit your web site from the browser, you need to modify the firewall configuration:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">sudo firewall-cmd --zone=public --permanent --add-service=http
sudo firewall-cmd --reload</pre>
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Install and setup MySQL</div>
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You can install MariaDB, a popular branch of MySQL, on your server instance:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">sudo yum install mariadb mariadb-server
sudo systemctl start mariadb.service
sudo systemctl enable mariadb.service
sudo /usr/bin/mysql_secure_installation</pre>
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Finish the secure MySQL installation according to the instructions below:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">Enter current password for root (enter for none): press the Enter key
Set root password? [Y/n]: Input Y, then press the Enter key
Set root password? [Y/n]: Input Y, then press the Enter key
Remove anonymous users? [Y/n]: Input Y, then press the Enter key
Disallow root login remotely? [Y/n]: Input Y, then press the Enter key
Remove test database and access to it? [Y/n]: Input Y, then press the Enter key
Reload privilege tables now? [Y/n]: Input Y, then press the Enter key</pre>
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Log into the MySQL shell to setup a database for dotProject:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">mysql -u root -p</pre>
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Input the root password you had setup earlier to log in, then execute the following commands one by one. Remember to replace the database name dotproject, the database username dotprojectuser, and the database user password yourpassword with your own ones.</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">CREATE DATABASE dotproject;
CREATE USER 'dotprojectuser'@'localhost' IDENTIFIED BY 'yourpassword';
GRANT ALL PRIVILEGES ON dotproject.* TO 'dotprojectuser'@'localhost';
GRANT ALL PRIVILEGES ON dotproject.* TO 'dotprojectuser'@'localhost' IDENTIFIED BY 'yourpassword' WITH GRANT OPTION;
FLUSH PRIVILEGES;
EXIT;</pre>
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Install and configure PHP</div>
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Install necessary PHP components using YUM:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">sudo yum install php php-gd php-mbstring php-mysqli php-curl php-ldap php-xsl php-xml php-cli php-pear</pre>
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Modify PHP settings in the php.ini file:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">sudo vi /etc/php.ini</pre>
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Replace the line:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">;date.timezone =</pre>
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with:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">date.timezone = Asia/Kolkata</pre>
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Asia/Kolkata is the timezone value of my server, you can find a suitable timezone value from <a href="https://secure.php.net/manual/en/timezones.php" target="_blank">here</a>.</div>
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Replace the line:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">session.auto_start = 0</pre>
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With:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">session.auto_start = 1</pre>
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Other settings in the file php.ini are already qualified, you can use the default values:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">session.use_trans_sid = 0
memory_limit = 128M</pre>
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Then Restart the httpd and mariadb server.</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">sudo systemctl restart httpd mariadb</pre>
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Download the dotProject installation package</div>
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Download dotProject Latest version for there official website.</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">wget http://downloads.sourceforge.net/project/dotproject/dotproject/dotProject Version 2.1.8/dotproject-2.1.8.tar.gz

tar -zxvf dotproject-2.1.8.tar.gz</pre>
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In order to prevent permission issues, you need to change the owner and permissions for each involved file.</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">sudo chown -R apache: dotproject/
sudo mv dotproject/* /var/www/html/</pre>
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Install dotProject from the browser</div>
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Now, visit your server from a web browser to finish the installation:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">http://[your-server-IP]</pre>
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Review the check results, then click the button "Start Installation" on the top.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjdbSawcQnQvubBTTDG6r9AJ45ZVz4iks5SqrQXhS3eR2SCyoshxb9eyswsf-ns4G3pp8bqiVS0TzJTJHJGOjKqoPi1Yiy6KrdbaCv3fAbgPpzuX2FwdLPcK55Y4TLTSWgiVJSVTljzEIMs/s1600/dotproject_installation_hackthesec.co.in.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjdbSawcQnQvubBTTDG6r9AJ45ZVz4iks5SqrQXhS3eR2SCyoshxb9eyswsf-ns4G3pp8bqiVS0TzJTJHJGOjKqoPi1Yiy6KrdbaCv3fAbgPpzuX2FwdLPcK55Y4TLTSWgiVJSVTljzEIMs/s1600/dotproject_installation_hackthesec.co.in.png" /></a></div>
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On the "Database Settings" screen, replace the default "Database User Name" and "Database User Password" with your own ones, then click the button "install db & write cfg" on the right-hand side..Example Bellow</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWrqKzLrDqfQT2S1OFmlpAR7kDsCNU8v1H83ZrIgGH4fQruUXMKaf3bItmwXkQpaFU4AnBa_aGYmwTeK5f-HveA_pSshBrqg8gqiQtnLxSElT-PHBUycTV8z_t6L-6ZWab1xaj_OldohSH/s1600/dotproject_db_installation_hackthesec.co.in.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWrqKzLrDqfQT2S1OFmlpAR7kDsCNU8v1H83ZrIgGH4fQruUXMKaf3bItmwXkQpaFU4AnBa_aGYmwTeK5f-HveA_pSshBrqg8gqiQtnLxSElT-PHBUycTV8z_t6L-6ZWab1xaj_OldohSH/s1600/dotproject_db_installation_hackthesec.co.in.png" /></a></div>
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On the next screen, click "Login and Configure the dotProject System Environment", then use the default credentials to log in:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">Username: admin
Password: passwd</pre>
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Security cleanup</div>
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For security purposes, you should change the password immediately as instructed below:</div>
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<div>
<ul style="font-size: 15px; line-height: 26px; text-align: left;">
<li>Find the menu on the web interface.</li>
<li>Click the menu item "User Admin => Login Name".</li>
<li>Under "admin", Click the link on the right hand side.</li>
<li>Under "change password", input a new password twice in the pop-up window.</li>
<li>Click the button "submit", then close the pop-up window.</li>
</ul>
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Next, remove the install directory within the dotProject environment</div>
</div>
</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">sudo rm -rf /var/www/html/install/</pre>
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That's all.</div>
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 </div>
<div>
<a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></div>
<div>
 </div>
</div>

How to install dotProject on CentOS 7

Install dotProject on CentOS dotProject is a web-based, multi-user, multi-language project management application. It is free and open s...

Installing Mod_Antiloris To Mitigate SlowLoris DOS Attack

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<h2 style="background-color: white; box-sizing: border-box; font-family: Raleway, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 30px; line-height: 1.1; margin-bottom: 10px; margin-top: 20px;">
Installing Mod_Antiloris To Mitigate SlowLoris DOS Attack</h2>
<div>
In computing, a denial-of-service (<a href="http://www.hackthesec.co.in/search/label/DOS" target="_blank">DoS</a>) attack is an attempt to make a machine or network resource unavailable to its intended users, such as to temporarily or indefinitely interrupt or suspend services of a host connected to the Internet.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbXyoGw_tVxPwMEaPBFK-7jx-AyZVVx6y5XVv0d_OY6LGrVfWQAug-kvGRptCO4vry43cDykBUs72vkGRas8rdImg3f8zqpr0HNUYdoQ7oGnjufhs8bIe6ncmkA2sgGmI96hWbvRu2nWK9/s1600/dos-attack-hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbXyoGw_tVxPwMEaPBFK-7jx-AyZVVx6y5XVv0d_OY6LGrVfWQAug-kvGRptCO4vry43cDykBUs72vkGRas8rdImg3f8zqpr0HNUYdoQ7oGnjufhs8bIe6ncmkA2sgGmI96hWbvRu2nWK9/s1600/dos-attack-hackthesec.co.in.jpg" /></a></div>
<div>
 </div>
<div>
A distributed denial-of-service (<a href="http://www.hackthesec.co.in/search/label/Ddos%20Attack" target="_blank">DDoS</a>) is where the attack source is more than one, often thousands of, unique IP addresses. It is analogous to a group of people crowding the entry door or gate to a shop or business, and not letting legitimate parties enter into the shop or business, disrupting normal operations.</div>
<div>
<a href="http://www.hackthesec.co.in/2016/05/how-to-protect-apache-server-from-dos-attack.html" itemprop="url" style="background-color: white; display: block; font-family: 'Open Sans', serif, sans-serif; font-size: 18.6px; font-weight: 600; text-decoration: none;"></a><ul style="text-align: left;"><a href="http://www.hackthesec.co.in/2016/05/how-to-protect-apache-server-from-dos-attack.html" itemprop="url" style="background-color: white; display: block; font-family: 'Open Sans', serif, sans-serif; font-size: 18.6px; font-weight: 600; text-decoration: none;"></a>
<li><a href="http://www.hackthesec.co.in/2016/05/how-to-protect-apache-server-from-dos-attack.html" itemprop="url" style="background-color: white; display: block; font-family: 'Open Sans', serif, sans-serif; font-size: 18.6px; font-weight: 600; text-decoration: none;"></a><a href="http://www.hackthesec.co.in/2016/05/how-to-protect-apache-server-from-dos-attack.html" itemprop="url" style="display: inline !important; font-size: 18.6px; text-decoration: none;">How to Protect Apache Server From Denial-of-Service (Dos) Attack</a></li>
</ul>
</div>
<div>
INSTALLATION:-</div>
<div>
Download the installer from sourceforge and install</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">[root@hackthesec]# cd /usr/local/src

[root@hackthesec]# apxs -a -i -c mod_antiloris.c</pre>
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<div>
Now restart Apache</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">[root@hackthesec]# service httpd restart</pre>
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check whether mod_antiloris loaded or not</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">httpd -M | grep antiloris</pre>
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Note:- if you are using cpanel server then you have to run the below command to make sure new modification are updated into configuration system file</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">/usr/local/cpanel/bin/apache_conf_distiller –update</pre>
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;"><a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></pre>
</div>
</div>

Installing Mod_Antiloris To Mitigate SlowLoris DOS Attack

Installing Mod_Antiloris To Mitigate SlowLoris DOS Attack In computing, a denial-of-service ( DoS ) attack is an attempt to make a machi...

How to Install mlocate (locate and updatedb Commands) on CentOS 7

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Install mlocate (locate and updatedb Commands) 
mlocate is a merging locate and database package. "Merging" means updatedb reuses the existing database to avoid re-reading most of the file system. This makes the database update faster and does not tax the system caches.  
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mlocate can index several file systems including network file systems for network shares. This package is essential when attempting to quickly find documents in a terminal. 
Install mlocate 
 
As a matter of best practice we'll update our packages: 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">yum -y update</pre>
Then let's install mlocate and any required packages: 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">yum -y install mlocate</pre>
Updating mlocate 
The following command will update the search databases: 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">updatedb</pre>
mlocate installs a cron job that will run daily to update search databases at: 
 
 
/etc/cron.daily/mlocate.cron 
 
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How to Install mlocate (locate and updatedb Commands) on CentOS 7

Install mlocate (locate and updatedb Commands) mlocate is a merging locate and database package. "Merging" means updatedb reuse...

How to install ONLYOFFICE Desktop Editor Ubuntu

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ONLYOFFICE – Alternative to LibreOffice – Ubuntu and derivatives 
ONLYOFFICE (formerly Teamlab Office) is a multifunctional online office suite integrated with CRM system, document and project management toolset, Gantt chart and email aggregator. ONLYOFFICE is written in ASP.NET and translated to 21 languages (as of October 2014). 
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ONLYOFFICE includes an online office application suite working within a browser. It combines text, spreadsheet and presentation editors that include features similar to Microsoft desktop editors (Word, Excel and PowerPoint) 
INSTALLATION:- 
You can download the latest version of Desktop Editors from the ONLYOFFICE official website <a href="http://www.onlyoffice.com/download-desktop.aspx" target="_blank">here</a>. 
Choose the Linux DEB-package installation package and click the Download button 
after download complete Run the downloaded package file. 
 
The <a href="http://www.hackthesec.co.in/search/label/Ubuntu" target="_blank">Ubuntu </a>Software Center will open. Click the Install button to start the installation process.example bellow.. 
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Alternately you can install ONLY-OFFICE Through Ubuntu Repository.. 
Install ONLYOFFICE using Repository: 
First need to download GPG signing key: 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">sudo wget http://download.onlyoffice.com/repo/onlyoffice.key
sudo apt-key add onlyoffice.key
</pre>
Add ONLYOFFICE Desktop Editors repository to the /etc/apt/sources.list file. Open this file using any available text editor  
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">sudo nano /etc/apt/sources.list</pre>
Add the following record 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">deb http://download.onlyoffice.com/repo/debian squeeze main</pre>
Update the package manager cache and Install the ONLYOFFICE 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">sudo apt-get update
sudo apt-get install onlyoffice-desktopeditors
</pre>
Once the installation is over, run the editors using the terminal command: 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">desktopeditors</pre>
Or find the editors in your computer Application menu – Office – ONLYOFFICE. 
 
 
You will see the following screen: 
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How to install ONLYOFFICE Desktop Editor Ubuntu

ONLYOFFICE – Alternative to LibreOffice – Ubuntu and derivatives ONLYOFFICE (formerly Teamlab Office) is a multifunctional online office s...

How to install uTorrent on Ubuntu 16.04

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Install uTorrent on Ubuntu 16.04 
µTorrent, or uTorrent (see pronunciation) is a freeware, ad-supported, proprietary BitTorrent client owned and developed by BitTorrent, Inc. With over 100 million users it is the most widely used BitTorrent client outside China; globally only behind Xunlei.The "µ" (Greek letter "mu") in its name comes from the SI prefix "micro-", referring to the program's small memory footprint: the program was designed to use minimal  
 
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computer resources while offering functionality comparable to larger BitTorrent clients such as Vuze or BitComet. The program has received consistently good reviews for its feature set, performance, stability, and support for older hardware and versions of Windows. 
INSTALLATION  
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">$ sudo apt-get update
$ sudo apt-get install libssl1.0.0 libssl-dev</pre>
<a href="http://www.utorrent.com/downloads/linux" target="_blank">Download the Latest version</a> of the uTorrent server from the official website or simply enter the following command to download the current version. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">### 32 bit ###

$ wget http://download-new.utorrent.com/endpoint/utserver/os/linux-i386-ubuntu-13-04/track/beta/ -O utserver.tar.gz

### 64 bit ###

$ wget http://download-new.utorrent.com/endpoint/utserver/os/linux-x64-ubuntu-13-04/track/beta/ -O utserver.tar.gz</pre>
Once you have downloaded, extract the file into /opt directory 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; float: none !important; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">$ sudo tar -zxvf utserver.tar.gz -C /opt/</pre>
<div>
Set an executable permission to the extracted directory for running the uTorrent Server.</div>
<div>
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">$ sudo chmod 777 /opt/utorrent-server-alpha-v3_3/</pre>
</div>
Link uTorrent Server to /usr/bin/ directory. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">$ sudo ln -s /opt/utorrent-server-alpha-v3_3/utserver /usr/bin/utserver</pre>
Start uTorrent Server by executing the following command. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">$ utserver -settingspath /opt/utorrent-server-alpha-v3_3/ &</pre>
Once you run the command, navigate your web browser to the following address. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">http://your-ip-address:8080/gui</pre>
Username is admin and leave the password field empty. 
 
Once you have logged in, set the download directory. To do that, click on Settings (Gear Icon) –> Directories –>  Put new downloads in —> mention the directory –> Save settings. 
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How to install uTorrent on Ubuntu 16.04

Install uTorrent on Ubuntu 16.04 µTorrent, or uTorrent (see pronunciation) is a freeware, ad-supported, proprietary BitTorrent client owne...

How to install and setup Icinga Monitoring Tool on CentOS 7 / RHEL 7

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Setup Icinga Monitoring Tool on CentOS 7 / RHEL 7 
Icinga is an open source computer system and network monitoring application. It was originally created as a fork of the Nagios system monitoring application in 2009. 
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Icinga is attempting to get past perceived short-comings in Nagios' development process, as well as adding new features such as a modern Web 2.0 style user interface, additional database connectors (for MySQL, Oracle, and PostgreSQL), and a REST API that lets administrators integrate numerous extensions without complicated modification of the Icinga core. 
Before we go ahead, lets install the required packages for Icinga. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># yum -y install wget httpd mod_ssl gd gd-devel mariadb-server php-mysql php-xmlrpc gcc mariadb libdbi libdbi-devel libdbi-drivers libdbi-dbd-mysql</pre>
Disable SELinux. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config</pre>
Reboot once done. 
 
Create icinga user and icinga-cmd group (allowing the external commands to be executed through the web interface) , add  icinga and apache user to the part of icinga-cmd group. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># useradd icinga
# groupadd icinga-cmd
# usermod -a -G icinga-cmd icinga
# usermod -a -G icinga-cmd apache</pre>
Download latest Icinga source tarball. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># cd /tmp/
# wget http://downloads.sourceforge.net/project/icinga/icinga/1.10.1/icinga-1.10.1.tar.gz
# tar -zxvf /tmp/icinga-1.10.1.tar.gz
# cd /tmp/icinga-1.10.1</pre>
Compile and Install Icinga: 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># ./configure --with-command-group=icinga-cmd --enable-idoutils
# make all
# make install
# make install-init
# make install-config
# make install-commandmode
# make install-webconf
# make install-idoutils</pre>
Configure Icinga: 
 
Sample configuration files have now been installed in the /usr/local/icinga/etc/ directory. These sample files should work fine for getting started with Icinga. You’ll need to make just one change before you proceed. Edit the /usr/local/icinga/etc/objects/contacts.cfg config file with your favorite editor and change the email address associated with the nagiosadmin contact definition to the address you’d like to use for receiving alerts. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># vi /usr/local/icinga/etc/objects/contacts.cfg</pre>
Change the Email address field to receive the notification. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">email icinga@localhost</pre>
to 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">email icinga@hackthesec.co.in</pre>
Move sample idoutils configuration files to Icinga base directory. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># cd /usr/local/icinga/etc/
# mv idomod.cfg-sample idomod.cfg
# mv ido2db.cfg-sample ido2db.cfg
# cd modules/
# mv idoutils.cfg-sample idoutils.cfg</pre>
Create database for idoutils: 
 
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"># systemctl start mariadb.service
# mysql -u root -p
MariaDB [(none)]> CREATE DATABASE icinga;
MariaDB [(none)]> GRANT USAGE ON icinga.* TO 'icinga'@'localhost' IDENTIFIED BY 'icinga' WITH MAX_QUERIES_PER_HOUR 0 MAX_CONNECTIONS_PER_HOUR 0 MAX_UPDATES_PER_HOUR 0;
MariaDB [(none)]> FLUSH PRIVILEGES;
MariaDB [(none)]> quit</pre>
Import Database. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># mysql -u root -p icinga < /tmp/icinga 1.10.1/module/idoutils/db/mysql/mysql.sql</pre>
Configure Web Interface: 
 
Create a icingaadmin account for logging into the Icinga web interface. Remember the password that you assign to this user – you’ll need it later. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># htpasswd -c /usr/local/icinga/etc/htpasswd.users icingaadmin</pre>
Restart Apache to make the new settings take effect. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">systemctl restart httpd.service</pre>
Download and Install Nagios Plugins: 
 
Download Nagios Plugins to /tmp directory. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># cd /tmp
# wget http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz
# tar -zxvf /tmp/nagios-plugins-2.0.3.tar.gz
# cd /tmp/nagios-plugins-2.0.3/</pre>
Compile and install the plugins. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># ./configure --prefix=/usr/local/icinga --with-cgiurl=/icinga/cgi-bin --with-nagios-user=icinga --with-nagios-group=icinga
# make
# make install</pre>
Starting Icinga: 
 
Verify the sample Icinga configuration files. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># /usr/local/icinga/bin/icinga -v /usr/local/icinga/etc/icinga.cfg</pre>
If there are no errors, start Nagios and Idoutils. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># /etc/init.d/icinga start
# /etc/init.d/ido2db start</pre>
Start Icinga and Idoutils on system startup. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># chkconfig ido2db on
# chkconfig icinga on
# systemctl enable httpd.service
# systemctl enable mariadb.service</pre>
Access Web Interface: 
 
Now access Icinga web interface using the following URL. You'll be prompted for the username (icingaadmin) and password you specified earlier. 
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<a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a> 
 
 </div>

How to install and setup Icinga Monitoring Tool on CentOS 7 / RHEL 7

Setup Icinga Monitoring Tool on CentOS 7 / RHEL 7 Icinga is an open source computer system and network monitoring application. It was orig...

How to Send Email from Node.js

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Send Email from Node.js</h1>
<div>
Node.js is an open-source, cross-platform runtime environment for developing server-side Web applications. Although <a href="http://www.hackthesec.co.in/search/label/Node.Js">Node.js</a> is not a JavaScript framework, many of its basic modules are written in JavaScript, and developers can write new modules in JavaScript. The runtime environment interprets JavaScript using Google's V8 JavaScript engine.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgS_d84hKw7Wbrd45feCZJfc5UzuZmMrKqYVaPQH4-eIyKaI03TQLhnTqrXKqI_29dGvp0lXdCdm-LzYjOLtOJYCam5NGABC8pKYMceCtBB1Ok5xvlkqtjylZXFrpaz78DavDHgahrHBuc0/s1600/sending-email-with-node-js-gmail-www.hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgS_d84hKw7Wbrd45feCZJfc5UzuZmMrKqYVaPQH4-eIyKaI03TQLhnTqrXKqI_29dGvp0lXdCdm-LzYjOLtOJYCam5NGABC8pKYMceCtBB1Ok5xvlkqtjylZXFrpaz78DavDHgahrHBuc0/s1600/sending-email-with-node-js-gmail-www.hackthesec.co.in.jpg" /></a></div>
<div>
 </div>
<div>
First you need to install nodemailer package in your application. Use following command to install this package.</div>
<div>
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">$ npm install nodemailer</pre>
</div>
<div>
Now add following code in your application to send email. Make sure to update all required values in below code to send email successfully.</div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">var nodemailer = require('nodemailer');

var mailTransport = nodemailer.createTransport('smtps://user%40gmail.com:email_password@smtp.gmail.com');

var mailOptions = {
 from: "Sender Name <sender@example.com>",
 to: "Recipient Name <recipient@example.com>",
 subject: "Hello World",
 text: "Test email with node.js"
 html: 'Test email with node.js'
};

mailTransport.sendMail(mailOptions, function(error, info){
 if(error){
 return console.log(error);
 }
 console.log('Message sent: ' + info.response);
});
</pre>
<div>
If you are still facing any issue with sending email through Gmail stmp servers make sure you are using correct login details. For 2 factor authentication enabled account required to generate application specific password and set here. Also you allow <a href="https://www.google.com/settings/security/lesssecureapps" target="_blank">less secure apps</a> in your Gmail account.</div>
<div>
 </div>
<div>
<a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></div>
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</div>

How to Send Email from Node.js

Send Email from Node.js Node.js is an open-source, cross-platform runtime environment for developing server-side Web applications. Alth...

Allow/deny,disable or drop/block ping packets on Linux serves

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Allow/deny,disable or drop/block ping request 
Ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network, and to measure the round-trip time for messages sent from the originating host to a destination computer and echoed back to the source.  
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The name comes from active sonar terminology that sends a pulse of sound and listens for the echo to detect objects under water,although it is sometimes interpreted as a backronym to packet Internet groper 
Blocking PING on server is helpful sometimes, if the server is continue to face any type of DDoS attack by using the PING feature. By using <a href="http://www.hackthesec.co.in/search/label/Iptables" target="_blank">iptables </a>we can simply stop the PING option. 
STEP : 1 
You can setup kernel variable to drop all ping packets. Type the following command at shell prompt: 
This instructs the kernel to simply ignore all ping requests. 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_all</pre>
To enable ping request type the command: 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">echo "0" > /proc/sys/net/ipv4/icmp_echo_ignore_all</pre>
You can add following line to /etc/sysctl.conf file: 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># vi /etc/sysctl.conf </pre>
Append following line: 
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">net.ipv4.icmp_echo_ignore_all = 1</pre>
Save and close the file. 
STEP : 2 
Also we can manage it by the help of '<a href="http://www.hackthesec.co.in/search/label/Iptables" target="_blank">iptables</a>'. The 'ping' is using ICMP to communicate. We can simply manage the 'icmp : Internet Controlled Message Protocol'from iptables. 
The below pasted switches are required for creating a rule for managing icmp. 
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">-A : Add a rule
-D : Delete rule from table
-p : To specify protocol (here 'icmp')
--icmp-type : For specifying type
-J : Jump to target</pre>
Normally using icmp types and its Codes Click here for ICMP Types and Codes 
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">echo-request : 8
echo-reply : 0
</pre>
<div>
How to block PING to your server with an error message?</div>
In this way you can partially block the PING with an error message 'Destination Port Unreachable'. Add the following iptables rules to block the PING with an error message. (Use REJECT as Jump to target) 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -A INPUT -p icmp --icmp-type echo-request -j REJECT</pre>
Result : -  
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">[root@redhat ~]# ping hackthesec.co.in
Pinging hackthesec.co.in [216.239.34.21] with 32 bytes of data:
From 216.239.34.2 icmp_seq=1 Destination Port Unreachable
From 216.239.34.2 icmp_seq=2 Destination Port Unreachable
From 216.239.34.2 icmp_seq=3 Destination Port Unreachable</pre>
To block without any messages use DROP as Jump to target. 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -A INPUT -p icmp --icmp-type echo-request -j DROP
iptables -A OUTPUT -p icmp --icmp-type echo-reply -j DROP</pre>
Allow Ping from Outside to Inside 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
iptables -A OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT</pre>
How to block PING from your server? 
In this way you can block PING option from your server to outside. Add these rules to your iptables to do the same. 
 
Block PING operation with message 'Operation not permitted' 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -A OUTPUT -p icmp --icmp-type echo-request -j DROP</pre>
Result:- 
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">root@test [~]# ping google.com
PING google.com (173.194.34.136) 56(84) bytes of data.
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted</pre>
To block with out any error messages 
For this, DROP the echo-reply to the INPUT chain of your iptables. 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -A OUTPUT -p icmp --icmp-type echo-request -j DROP
iptables -A INPUT -p icmp --icmp-type echo-reply -j DROP</pre>
Allow Ping from Inside to Outside 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -A OUTPUT -p icmp --icmp-type echo-request -j ACCEPT
iptables -A INPUT -p icmp --icmp-type echo-reply -j ACCEPT</pre>
You can use the icmp code instead of icmp-type name for adding rule to iptables. 
 
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