Hack The Sec-Leading Resource Of Linux Tutorial: secure ftp

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<span style="color: #990000;">Protect SSH/FTP using Fail2ban on <span style="color: #990000;"><a href="http://www.hackthesec.co.in/search/label/Centos" target="_blank">CentOS</a>/<a href="http://www.hackthesec.co.in/search/label/RHEL" target="_blank">RHEL</a></span></span></h2>
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<span style="background-color: white; border: 0px; font-family: 'Roboto Slab'; font-size: 16px; font-weight: 700; line-height: 28px; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">Fail2ban</span><span style="background-color: white; font-family: 'Roboto Slab'; font-size: 16px; line-height: 28px;"> is very useful application for you, if you are managing security of server, or you are running your own vps or physical server. Fail2ban scan log files created on system and has ability to ban ips which found malicious bassed on configuration rules. We can use it for monitoring various system services logs like Apache, SSH and blog the ips which are trying to breach the system’s security.</span><br />
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<span style="background-color: white; color: #0b5394; font-family: 'Roboto Slab'; font-size: 24px; font-weight: bolder; line-height: 34px;">Step 1: Install EPEL RPM Repository</span><br />
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<span style="font-size: large;"><span style="line-height: 28px;">Fail2ban is available in <a href="http://www.hackthesec.co.in/2016/01/how-to-install-epel-repo-on-centos-and.html" target="_blank">EPEL</a> repository, So make sure you have installed <a href="http://www.hackthesec.co.in/2016/01/how-to-install-epel-repo-on-centos-and.html" target="_blank">EPEL</a> repository in your system or you can use </span><a href="http://www.hackthesec.co.in/2016/01/how-to-install-epel-repo-on-centos-and.html" style="line-height: 28px; outline: none; text-decoration: none;" target="_blank">these instructions</a><span style="line-height: 28px;"> to install it.</span></span></div>
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<span style="line-height: 28px;"><br /></span><span style="font-size: 24px; font-weight: bolder; line-height: 34px;"><span style="color: #0b5394;">Step 2: Install Fail2ban Package</span></span></div>
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After installing required repository use yum package manager to install Fail2ban rpm package using following command.</div>
<pre style="background: none 0px 0px repeat scroll rgb(60, 60, 60); border-radius: 4px; border: 1px solid rgb(229, 229, 229); color: white; line-height: 1.3em; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"># yum install fail2ban<span style="font-size: 0.9em;">
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<span style="color: #0b5394;">Step 3: Setup Fail2ban Default Configuration</span></h2>
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Fail2ban provides its own security configuration file <span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-size: inherit; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">/etc/fail2ban/jail.conf</span>, but we need to create a copy of this file as <span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-size: inherit; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">jail.local</span>.</div>
<pre style="background: none 0px 0px repeat scroll rgb(60, 60, 60); border-radius: 4px; border: 1px solid rgb(229, 229, 229); color: white; line-height: 1.3em; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"># cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local<span style="font-size: 0.9em;">
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Now we need to make necessory changes in jail.local file to create ban rules. Edit this file in your favorite editor and make changes in <span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-size: inherit; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">[DEFAULT]</span> section.</div>
<pre style="background: none 0px 0px repeat scroll rgb(60, 60, 60); border-radius: 4px; border: 1px solid rgb(229, 229, 229); color: white; line-height: 1.3em; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"># "ignoreip" can be an IP address, a CIDR mask or a DNS host. Fail2ban will use as always allowed, 
# so add your system ip to protect your ip from banned.
<orange style="color: orange;">ignoreip = 127.0.0.1/8 192.168.1.0/24 11.22.33.44</orange>

# "bantime" is the total number of seconds that a host is banned (3600sec = 1 Hour ).
<orange style="color: orange;">bantime  = 3600</orange>

# A host is banned if it has generated "maxretry" during the last "findtime" seconds. as per below 
# settings, 2 minutes
<orange style="color: orange;">findtime  = 120</orange>

# "maxretry" is the number of failures before a host get banned.
<orange style="color: orange;">maxretry = 3 </orange><span style="font-size: 0.9em;">
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<span style="color: #0b5394;">Step 4: Protect SSH/SFTP</span></h2>
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After completing default configuration, go down in the same file jail.local and update <span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-size: inherit; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">[ssh-iptables]</span> section as below.</div>
<pre style="background: none 0px 0px repeat scroll rgb(60, 60, 60); border-radius: 4px; border: 1px solid rgb(229, 229, 229); color: white; line-height: 1.3em; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">enabled  = true
filter   = sshd
action   = iptables[name=SSH, port=22, protocol=tcp]
           sendmail-whois[name=SSH, dest=root, sender=admin@hackthesec.co.in, sendername="Fail2Ban"]
logpath  = /var/log/secure
maxretry = 3<span style="font-size: 0.9em;">
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<span style="color: #0b5394;">Step 5: Protect FTP (vsFTPd) Server</span></h2>
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Let’s protect your FTP (vsFTPd) server, Find the below entry of <span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-size: inherit; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">[vsftpd-iptables]</span> section and make changes as below. If you are not using vsFTPd, you can skip this section.</div>
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enabled  = true
filter   = vsftpd
action   = iptables[name=VSFTPD, port=21, protocol=tcp]
           sendmail-whois[name=VSFTPD, dest=admin@hackthesec.co.in]
logpath  = /var/log/vsftpd.log
maxretry = 5
bantime  = 1800<span style="font-size: 0.9em;">
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<span style="color: #0b5394;">Step 6: Restart Fail2ban Service</span></h2>
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After making all the changes save your file and restart Fail2ban service using following command.</div>
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<pre style="-webkit-text-stroke-width: 0px; background: none 0px 0px repeat scroll rgb(60, 60, 60); border-radius: 4px; border: 1px solid rgb(229, 229, 229); color: white; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 1.3em; margin: 0px 0px 20px; orphans: auto; outline: 0px; overflow: auto; padding: 20px; text-align: start; text-indent: 0px; text-transform: none; vertical-align: baseline; widows: 1; word-spacing: 0px;"># service fail2ban restart
# chkconfig fail2ban on<span style="font-size: 0.9em;">
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How To Protect SSH/FTP using Fail2ban on CentOS/RHEL

Protect SSH/FTP using Fail2ban on CentOS / RHEL Fail2ban is very useful application for you, if you are managing security of server, ...