Hack The Sec-Leading Resource Of Linux Tutorial: DKIM

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<span style="color: #0b5394; font-size: large;"><u>Enabling email authentication (SPF and DKIM)</u></span></h1>
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<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px;">cPanel is a <a href="http://www.hackthesec.co.in/search/label/Linux%20Tutorial">Linux-based</a> web hosting control panel that provides a graphical interface and automation tools designed to simplify the process of hosting a web site. cPanel utilizes a 3 tier structure that provides capabilities for administrators, resellers, and end-user website owners to control the various aspects of website and server administration through a standard web browser.</span></span></div>
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<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px;">In addition to the GUI, cPanel also has command line and API-based access that allows third party software vendors, web hosting organizations, and developers to automate standard system administration processes.</span></span></div>
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<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px;">cPanel is designed to function either as a dedicated server or virtual private server. The latest cPanel version supports installation on CentOS, Red Hat Enterprise Linux (RHEL), and CloudLinux OS. cPanel 11.30 is the last major version to support FreeBSD.</span></span></div>
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<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px;">Application-based support includes Apache, PHP, MySQL, PostgreSQL, Perl, and BIND (DNS). Email based support includes POP3, IMAP, and SMTP services. cPanel is accessed via https on port 2083</span></span></div>
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<span style="font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px;"><b><u><span style="color: #0b5394;">cPanel script to enable SPF via commandline:</span></u></b></span></span></div>
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Syntax</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;"><span style="color: white; font-family: monospace , serif;"><span style="font-size: 14px;"># /usr/local/cpanel/bin/spf_installer $username</span></span></pre>
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<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px;">Where, $username is the cPanel user name</span></span></div>
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<span style="font-family: "verdana" , "geneva" , sans-serif; font-size: 15px;"><b><u><span style="color: #0b5394;">cPanel script to enable DKIM via commandline:</span></u></b></span><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"></span><br />
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<span style="font-size: 15px;">Syntax</span></div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;"><span style="color: white; font-family: monospace , serif;"><span style="font-size: 14px;">#  /usr/local/cpanel/bin/dkim_keys_install $username</span></span></pre>
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<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px;">Replace $username with the actual cPanel username.</span></span></div>
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The above commands will help you to enable email authentications for single cPanel users. If you have hundreds of accounts and you want to enable SPF and DKIM for all accounts, please follow the simple for loop.</div>
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Here we can get the cPanel usernames from "/var/cpanel/users". Then give that to installations scripts. Please see the sample script below:</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;"><span style="color: white; font-family: monospace , serif;"><span style="font-size: 14px;">for username in `ls -A /var/cpanel/users` ; do
       /usr/local/cpanel/bin/dkim_keys_install $username  &&
       /usr/local/cpanel/bin/spf_installer $username ; done</span></span></pre>
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Thanks for support</div>
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<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px;">
<a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></div>
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Enabling email authentication (SPF and DKIM) for all existing accounts – cPanel/WHM

Enabling email authentication (SPF and DKIM) cPanel is a Linux-based web hosting control panel that provides a graphical interface and...

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<span style="color: red;"><u><i>Setup DKIM (DomainKeys) with Postfix on Ubuntu & Debian</i></u></span></h2>
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<span style="background-color: white;"><span style="line-height: 28px;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: large;"><b>DomainKeys Identified Mail </b>(<b>DKIM</b>) is an email authentication method designed to detect email spoofing by providing a mechanism to allow receiving mail exchangers to check that incoming mail from a domain is authorized by that domain's administrators.In technical terms, DKIM is a </span></span></span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgwKpIQ7e4ZfTIYX-ozR6kYqk2ktJG9tC1Sy0ExOC0SVnE_QHF06sQMyG99K5qBE0zelXXTgSaxcWTwcT3y5R9qK6iDeW7YqcStisuexkfPN8xVXrSSIimoE6wxaQN8nwx3GgmlY4rMRa1f/s1600/DKIM_www.hackthesec.co.in.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="257" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgwKpIQ7e4ZfTIYX-ozR6kYqk2ktJG9tC1Sy0ExOC0SVnE_QHF06sQMyG99K5qBE0zelXXTgSaxcWTwcT3y5R9qK6iDeW7YqcStisuexkfPN8xVXrSSIimoE6wxaQN8nwx3GgmlY4rMRa1f/s400/DKIM_www.hackthesec.co.in.png" width="400" /></a></div>
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<span style="background-color: white;"><span style="line-height: 28px;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">technique to authorize a domain to associate its name to an email message through cryptographic authentication.</span></span></span></div>
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<span style="color: #0b5394;">Step 1: Install opendkim Package</span></h2>
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<span style="font-family: "georgia" , "times new roman" , serif;">First we need to install <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;">opendkim </span>and <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;">opendkim-tools</span> packages using following command.</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;"><span style="font-size: large;">$ sudo apt-get install opendkim opendkim-tools
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<span style="color: #0b5394;">Step 2: Generate Key Pair</span></h2>
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<span style="font-family: "georgia" , "times new roman" , serif;">Now create DKIM key pair using <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;">opendkim-genkey</span> command line utility. For this tutorial we are using domain name “hackthesec.co.in”, Change this name with your actual domain name.</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;"><span style="font-size: large;">$ MYDOMAIN=hackthesec.co.in
$ mkdir -p /etc/mail/dkim-keys/$MYDOMAIN
$ cd /etc/mail/dkim-keys/$MYDOMAIN
$ opendkim-genkey -t -s mail -d $MYDOMAIN</span><span style="font-size: 0.9em;">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgPTFZaq35Oimo_cHciUg7ZF3kszjskssH0TnQ2AZzmi9gnQmqWwhPqxMd8m_A3lV6sz5LAjuxKwxKZUL1Doej930ZnwmngXYrlWmgFLTXR1r8tySIZlhHdRxtE_cgmh2N3s7uQI7wvIrSL/s1600/Generate_Key+_Pair_www.hackthesec.co.in.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="136" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgPTFZaq35Oimo_cHciUg7ZF3kszjskssH0TnQ2AZzmi9gnQmqWwhPqxMd8m_A3lV6sz5LAjuxKwxKZUL1Doej930ZnwmngXYrlWmgFLTXR1r8tySIZlhHdRxtE_cgmh2N3s7uQI7wvIrSL/s640/Generate_Key+_Pair_www.hackthesec.co.in.png" width="640" /></a></div>
<span style="font-family: "georgia" , "times new roman" , serif;"><br /></span>
<span style="font-family: "georgia" , "times new roman" , serif;">Above command will generate two files <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.private</span> and <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.txt</span>. You can created multiple DKIM keys for different-2 domains and configure with your postfix server.</span></div>
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<span style="color: #0b5394;">Step 3: Configure DKIM and POSTFIX</span></h2>
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<span style="font-family: "georgia" , "times new roman" , serif;">First edit the domain keys lists setting 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/mail/dkim.key</span> and add following entry.</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;"><span style="font-size: large;">*@hackthesec.co.in:<span style="line-height: 1.3em;">hackthesec.co.in</span></span><span style="font-size: large; line-height: 1.3em;">:/etc/mail/dkim-keys/hackthesec.co.in/default.private</span></pre>
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<span style="font-family: "georgia" , "times new roman" , serif;">Edit DKIM 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/opendkim.conf</span> and update below values in configuration file.</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;"><span style="font-size: large;">Domain             <span style="line-height: 1.3em;">hackthesec.co.in</span>
KeyFile            /etc/mail/dkim.key
Selector           mail
Socket    inet:8892@localhost</span><span style="font-size: 0.9em;">
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<span style="font-family: "georgia" , "times new roman" , serif;">Now edit POSTFIX 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/postfix/main.cf</span> and add following values at the end of file</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;"><span style="font-size: large;">milter_default_action = accept
milter_protocol = 2
smtpd_milters = inet:localhost:8892
non_smtpd_milters = inet:localhost:8892</span><span style="font-size: 0.9em;">
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<span style="color: #0b5394;">Step 4: Configure DNS Entry</span></h2>
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<span style="font-family: "georgia" , "times new roman" , serif;">After configuring private key in postfix server. there will be another 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;">default.txt</span> generated by opendkim-genkey. Edit your DNS zone file and add this as TXT record found in default.txt.</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;"><span style="font-size: large;">mail._domainkey.hackthesec.coin IN TXT "v=DKIM1; k=rsa; p=IOIIGfBGGCSqGSIb3DEFGAQUAA4GNHDCBiQKBgRG6RY5DLhAbbrqcwgyBaC
x50scjedj357we9SJdff6VHOKDYgU/kvuV2rQiedHjtJDPuFJIwoNqh8pbIWxcZ8J2FhVhXU1QWdBmOQ/w61jfsyVAMrX/SrcJAd/1
XHYcS4o3uIOV7jICVOJLiYW5wjYLvWpPoraQzQE1Npjlsx2T5QIDAQAB" ; ----- DKIM key default for hackthesec.co.in</span><span style="font-size: 0.9em;">
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<span style="color: #0b5394;">Step 5: Restart Service</span></h2>
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<span style="font-family: "georgia" , "times new roman" , serif;">After making all above configuration’s restart dkim and postfix services</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;"><span style="font-size: large;">$ sudo service opendkim restart
$ sudo service postfix restart</span><span style="font-size: 0.9em;">
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<span style="color: #0b5394;">Step 6: Verify DKIM</span></h2>
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<span style="font-family: "georgia" , "times new roman" , serif;">And you have all done. Let’s verify that DKIM is working properly. Let’s send a test email through command line</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;"><span style="font-size: large;">$ mail -vs "Test DKIM" hackthesec@gmail.com < /dev/null
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<span style="font-family: "georgia" , "times new roman" , serif;">In received email in our mailbox, open the source of email and search for "DKIM-Signature". You will find some thing like below</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;"><span style="font-size: large;">DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=hackthesec.co.in;
 s=default.private; t=1431284463;
 bh=fdkeB/b0Fghse2k4J4pNas23AsqBm9+c0CsOYesw8=;
 h=Date:From:Message-Id:To:Subject;
 b=M6g0easdqURha9d7sdWldOddXsXxrMtN2qrSQ6/1AZtDxDkDDfoBTHDzoESlD
  i6uLLwV+3/JTs7mFmrkvlA5ZR693sM5gkVgVJmuOsylXSwd3XNfEcGSqFRRIrLhHtbC
  mAXMNxJtih9OuVNi96TrFNyUJeHMRvvbo34BzqWY=

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