182 lines
9 KiB
HTML
182 lines
9 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>Use a bought SSL certificate</title>
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<link rel="stylesheet" type="text/css" href="./css/markdown.css" />
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</head>
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<body>
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<div id="navigation">
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<a href="https://www.iredmail.org" target="_blank">
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<img alt="iRedMail web site"
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src="./images/logo-iredmail.png"
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style="vertical-align: middle; height: 30px;"
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/>
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<span>iRedMail</span>
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</a>
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// <a href="./index.html">Document Index</a></div><div class="admonition note">
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<p class="admonition-title">This tutorial is available in other languages. <a href="https://bitbucket.org/zhb/iredmail-docs/src">Help translate more</a></p>
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<p><a href="./use.a.bought.ssl.certificate-zh_CN.html">简体中文</a> /</p>
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</div>
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<h1 id="use-a-bought-ssl-certificate">Use a bought SSL certificate</h1>
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<div class="toc">
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<ul>
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<li><a href="#use-a-bought-ssl-certificate">Use a bought SSL certificate</a><ul>
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<li><a href="#get-a-ssl-certificate">Get a SSL certificate</a><ul>
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<li><a href="#request-a-free-cert-from-lets-encrypt">Request a free cert from Let's Encrypt</a></li>
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<li><a href="#buy-from-a-trusted-ssl-vendor">Buy from a trusted SSL vendor</a></li>
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</ul>
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</li>
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<li><a href="#use-the-bought-cert">Use the bought cert</a><ul>
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<li><a href="#replace-cert-files">Replace cert files</a></li>
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<li><a href="#restart-network-services">Restart network services</a></li>
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</ul>
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</li>
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<li><a href="#verify-the-cert">Verify the cert</a></li>
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<li><a href="#see-also">See Also</a></li>
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</ul>
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</li>
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</ul>
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</div>
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<p>iRedMail generates a self-signed SSL certificate during installation, it's
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fine if you just want to secure the network connections (POP3/IMAP/SMTP over
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TLS, HTTPS), but mail clients or web browsers will promot a annoying message
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to warn you this self-signed certificate is not trusted. To avoid this
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annoying message, you have to buy a SSL certificate from SSL certificate
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provider. Search <code>buy ssl certificate</code> in Google will give you many SSL
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providers, choose the one you prefer.</p>
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<h2 id="get-a-ssl-certificate">Get a SSL certificate</h2>
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<h3 id="request-a-free-cert-from-lets-encrypt">Request a free cert from Let's Encrypt</h3>
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<p>We have another tutorial to show you to request a free cert from Let's Encrypt:
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<a href="./letsencrypt.html">Request a free cert from Let's Encrypt</a>.</p>
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<h3 id="buy-from-a-trusted-ssl-vendor">Buy from a trusted SSL vendor</h3>
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<p>To buy ssl cert from a trusted vendor, you need to generate a new SSL
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key and signing request file on your server with <code>openssl</code> command:</p>
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<div class="admonition warning">
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<p class="admonition-title">Warning</p>
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<p>Do NOT use key length smaller than <code>2048</code> bit, it's insecure.</p>
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</div>
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<pre><code># openssl req -new -newkey rsa:2048 -nodes -keyout privkey.pem -out server.csr
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</code></pre>
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<p>This command will generate two files:</p>
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<ul>
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<li><code>privkey.pem</code>: the private key for the decryption of your SSL certificate.</li>
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<li><code>server.csr</code>: the certificate signing request (CSR) file used to apply
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for your SSL certificate. <strong>This file is required by SSL certificate
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provider.</strong></li>
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</ul>
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<p>The openssl command will prompt for the following X.509 attributes of the
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certificate:</p>
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<ul>
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<li><code>Country Name (2 letter code)</code>: Use the two-letter code without punctuation
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for country. for example: US, CA, CN.</li>
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<li><code>State or Province Name (full name)</code>: Spell out the state completely; do not
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abbreviate the state or province name, for example: California.</li>
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<li><code>Locality Name (eg, city)</code>: City or town name, for example: Berkeley.</li>
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<li><code>Organization Name (eg, company)</code>: Your company name.</li>
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<li><code>Organizational Unit Name (eg, section)</code>: The name of the department or
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organization unit making the request.</li>
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<li><code>Common Name (e.g. server FQDN or YOUR name)</code>: server FQDN or your name.</li>
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<li><code>Email Address []</code>: your full email address.</li>
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<li><code>A challenge password []</code>: type a password for this ssl certificate.</li>
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<li><code>An optional company name []</code>: an optional company name.</li>
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</ul>
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<p><strong>NOTE</strong>: Some certificates can only be used on web servers using the <code>Common Name</code>
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specified during enrollment. For example, a certificate for the domain
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<code>domain.com</code> will receive a warning if accessing a site named <code>www.domain.com</code>
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or <code>secure.domain.com</code>, because <code>www.domain.com</code> and <code>secure.domain.com</code> are
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different from <code>domain.com</code>.</p>
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<p>Now you have two files: <code>privkey.pem</code> and <code>server.csr</code>. Go to the website of
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your preferred SSL privider, it will ask you to upload <code>server.csr</code> file to
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issue an SSL certificate.</p>
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<p>Usually, SSL provider will give you 2 files:</p>
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<ul>
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<li><code>cert.pem</code></li>
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<li><code>fullchain.pem</code> (some SSL providers use name <code>server.ca-bundle</code>)</li>
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</ul>
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<p>We need above 2 files, and <code>privkey.pem</code>. Upload them to your server, you can
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store them in any directory you like, recommended directories are:</p>
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<ul>
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<li>on RHEL/CentOS: <code>cert.pem</code> and <code>fullchain.pem</code> should be placed under
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<code>/etc/pki/tls/certs/</code>, <code>privkey.pem</code> should be <code>/etc/pki/tls/private/</code>.</li>
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<li>on Debian/Ubuntu, FreeBSD: <code>cert.pem</code> and <code>fullchain.pem</code> should be
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placed under <code>/etc/ssl/certs/</code>, <code>privkey.pem</code> should be <code>/etc/ssl/private/</code>.</li>
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<li>on OpenBSD: <code>/etc/ssl/</code>.</li>
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</ul>
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<h2 id="use-the-bought-cert">Use the bought cert</h2>
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<p>The easiest and quickest way to use the bought cert is replacing
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the self-signed SSL cert generated by iRedMail installer, then
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restart services which use the cert files.</p>
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<h3 id="replace-cert-files">Replace cert files</h3>
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<div class="admonition warning">
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<p class="admonition-title">Warning</p>
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<p>If you deployed iRedMail with the iRedMail Easy platform, ssl cert files
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are stored under <code>/opt/iredmail/ssl/</code>:</p>
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<ul>
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<li><code>key.pem</code>: private key</li>
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<li><code>cert.pem</code>: certificate</li>
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<li><code>combined.pem</code>: full chain</li>
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</ul>
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</div>
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<ul>
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<li>On RHEL/CentOS:</li>
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</ul>
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<pre><code>mv /etc/pki/tls/certs/iRedMail.crt{,.bak} # Backup. Rename iRedMail.crt to iRedMail.crt.bak
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mv /etc/pki/tls/private/iRedMail.key{,.bak} # Backup. Rename iRedMail.key to iRedMail.key.bak
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cp fullchain.pem /etc/pki/tls/certs/iRedMail.crt
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cp privkey.pem /etc/pki/tls/private/iRedMail.key
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</code></pre>
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<ul>
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<li>On Debian/Ubuntu, FreeBSD and OpenBSD:</li>
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</ul>
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<pre><code>mv /etc/ssl/certs/iRedMail.crt{,.bak} # Backup. Rename iRedMail.crt to iRedMail.crt.bak
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mv /etc/ssl/private/iRedMail.key{,.bak} # Backup. Rename iRedMail.key to iRedMail.key.bak
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cp fullchain.pem /etc/ssl/certs/iRedMail.crt
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cp privkey.pem /etc/ssl/private/iRedMail.key
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</code></pre>
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<h3 id="restart-network-services">Restart network services</h3>
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<p>Required services:</p>
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<ul>
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<li>Postfix</li>
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<li>Dovecot</li>
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<li>Nginx or Apache</li>
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</ul>
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<p>Depends on the backend you chose during iRedMail installation, you may need to
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restart:</p>
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<ul>
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<li>MySQL or MariaDB</li>
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<li>PostgreSQL</li>
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<li>OpenLDAP</li>
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</ul>
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<h2 id="verify-the-cert">Verify the cert</h2>
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<ul>
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<li>To verify ssl cert used in Postfix (SMTP server) and Dovecot, please launch a
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mail client application (MUA, e.g. Outlook, Thunderbird) and create an email
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account, make sure you correctly configured the MUA to connect to mail
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server. If SSL cert is not valid, MUA will warn you.</li>
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<li>For Apache / Nginx web server, you can access your website with favourite web
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browser, the browser should show you the ssl cert status. Or, use other
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website to help test it, for example:
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<a href="https://www.ssllabs.com/ssltest/index.html">https://www.ssllabs.com/ssltest/index.html</a> (input your web host name, then
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submit and wait for a result).</li>
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</ul>
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<h2 id="see-also">See Also</h2>
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<ul>
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<li><a href="./letsencrypt.html">Request a free cert from Let's Encrypt</a></li>
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</ul><div class="footer">
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<p style="text-align: center; color: grey;">All documents are available in <a href="https://bitbucket.org/zhb/iredmail-docs/src">BitBucket repository</a>, and published under <a href="http://creativecommons.org/licenses/by-nd/3.0/us/" target="_blank">Creative Commons</a> license. You can <a href="https://bitbucket.org/zhb/iredmail-docs/get/tip.tar.bz2">download the latest version</a> for offline reading. If you found something wrong, please do <a href="https://www.iredmail.org/contact.html">contact us</a> to fix it.</p>
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