{"id":2804,"date":"2013-12-04T09:59:26","date_gmt":"2013-12-04T15:59:26","guid":{"rendered":"https:\/\/secure.rosehosting.com\/blog\/?p=2804"},"modified":"2022-12-19T07:00:18","modified_gmt":"2022-12-19T13:00:18","slug":"set-up-ssl-encrypted-connection-in-postfix-dovecot-and-apache","status":"publish","type":"post","link":"https:\/\/www.rosehosting.com\/blog\/set-up-ssl-encrypted-connection-in-postfix-dovecot-and-apache\/","title":{"rendered":"Set-up SSL encrypted connection in Postfix, Dovecot and Apache"},"content":{"rendered":"
<\/div>

\"Set-up This article is part 3<\/strong> of our part 1<\/strong> mailserver set-up with virtual users and domains using Postfix and Dovecot<\/a> on a CentOS 6 VPS<\/a> and part 2 <\/strong>which explains how to install and set-up the Roundcube webmail interface<\/a><\/p>\n

The following post will show you how to set-up SSL encrypted connection<\/strong> to our mailserver installation.<\/p>\n

At the end of this article you will end-up using IMAP\/POP3 over SSL<\/strong> (IMAPs<\/strong>\/POP3s<\/strong>) SMTP over SSL<\/strong> (SMTPs<\/strong>) and Roundcube Webmail over SSL<\/strong> (HTTPS<\/strong>)<\/p>\n

<\/p>\n

UPDATE THE SYSTEM<\/strong><\/h3>\n

As always, make sure your CentOS 6<\/strong> Linux VPS<\/a> is fully up to date by executing:<\/p>\n

## screen -U -S ssl-screen\r\n## yum update<\/pre>\n
SET-UP SSL CERTIFICATE, KEY AND CSR<\/h3>\n
Next thing we are going to do, is to set-up the SSL certificate file and key. Do this by executing the following:<\/p>\n
## yum install openssl<\/pre>\n
## mkdir -p ~\/ssl\/mydomain.com\r\n## cd ~\/ssl\/mydomain.com\r\n## openssl genrsa -des3 -out mydomain.com.key 2048\r\n## openssl req -new -key mydomain.com.key -out mydomain.com.csr\r\n## openssl x509 -req -days 365 -in mydomain.com.csr -signkey mydomain.com.key -out mydomain.com.crt\r\n## cp mydomain.com.key{,.orig}\r\n## openssl rsa -in mydomain.com.key.orig -out mydomain.com.key\r\n## chmod 400 mydomain.com.key\r\n\r\n## cp mydomain.com.crt \/etc\/pki\/tls\/certs\r\n## cp mydomain.com.{key,csr} \/etc\/pki\/tls\/private\/<\/pre>\n
\n
SET-UP WEBMAIL OVER SSL<\/strong><\/h3>\n
In order to have your Roundcube webmail<\/strong> system accessible over SSL encrypted connection<\/strong> you will need to set-up Apache’s mod_ssl interface to openssl<\/strong> by running the following commands:<\/p>\n
## yum install mod_ssl\r\n## vim +\/SSLCertificateFile \/etc\/httpd\/conf.d\/ssl.conf<\/pre>\n
set the paths to the SSL certificate and private key<\/p>\n
SSLCertificateFile \/etc\/pki\/tls\/certs\/mydomain.com.crt\r\nSSLCertificateKeyFile \/etc\/pki\/tls\/private\/mydomain.com.key<\/pre>\n
force SSL encrypted connection when accessing mydomain.com\/webmail:<\/p>\n
## vim \/etc\/httpd\/conf.d\/90-roundcube.conf<\/pre>\n
add the following:<\/p>\n
RewriteEngine On\r\nRewriteCond %{HTTPS} !=on\r\nRewriteRule ^\/?webmail\/(.*) https:\/\/%{SERVER_NAME}\/webmail\/$1 [R,L]<\/pre>\n
finally, restart Apache for the changes to take effect and try to access http:\/\/mydomain.com\/webmail<\/p>\n
## service httpd restart<\/pre>\n
\n
SET-UP IMAP\/POP3 OVER SSL<\/strong><\/h3>\n
In order to enable IMAPs<\/strong> and POP3s<\/strong>, you need to edit dovecot main configuration file (\/etc\/dovecot\/dovecot.conf<\/code>) and add\/edit the following:<\/p>\n
protocols = imap pop3\r\n\r\nssl = yes\r\nssl_cert = <\/etc\/pki\/tls\/certs\/mydomain.com.crt\r\nssl_key = <\/etc\/pki\/tls\/private\/mydomain.com.key<\/pre>\n
restart dovecot for the changes to take effect and verify it’s listening on its SSL ports using:<\/p>\n
## service dovecot restart\r\n## ss -tpl | grep -E 'imaps|pop3s'\r\nLISTEN  0  0  *:imaps *:* users:((\"dovecot\",1955,22))\r\nLISTEN  0  0  *:pop3s *:* users:((\"dovecot\",1955,18))<\/pre>\n
to test IMAPs or POP3s, simply set your email client to use the SSL port, for example for IMAPs 993 and for POP3s 995 and try to receive an email.<\/p>\n
\n
SET-UP SMTP over SSL<\/strong><\/h3>\n
To enable SSL support in Postfix so you can send emails using SMTP over SSL, you need to edit two Postfix configuration files. Start with editing \/etc\/postfix\/main.cf<\/code> and add the following:<\/p>\n
## vim \/etc\/postfix\/main.cf<\/pre>\n
smtpd_use_tls = yes\r\nsmtpd_tls_key_file  = \/etc\/pki\/tls\/private\/mydomain.com.key\r\nsmtpd_tls_cert_file = \/etc\/pki\/tls\/certs\/mydomain.com.crt\r\n\r\nsmtpd_tls_loglevel = 3\r\nsmtpd_tls_received_header = yes\r\nsmtpd_tls_session_cache_timeout = 3600s\r\ntls_random_source = dev:\/dev\/urandom<\/pre>\n
then edit \/etc\/postfix\/master.cf<\/code> and make sure the following line is not commented:<\/p>\n
## vim +\/smtps \/etc\/postfix\/master.cf<\/pre>\n
smtps     inet  n       -       n       -       -       smtpd\r\n  -o smtpd_tls_wrappermode=yes\r\n  -o smtpd_sasl_auth_enable=yes<\/pre>\n
restart Postfix for the change to take effect and verify it is listening on its SSL port using:<\/p>\n
## service postfix restart\r\n\r\n## ss -tnpl | grep 465\r\nLISTEN 0 0  *:465 *:* users:((\"master\",2119,19))<\/pre>\n
test SMTPs by setting up your email client to use outgoing port 465.<\/p>\n
\n
Implementing SSL encrypted connections<\/strong> to the mailserver set-up with virtual users and domains using Postfix and Dovecot<\/a> and to the Roundcube webmail interface<\/a> on a CentOS VPS<\/a> provide you SSL encrypted connection for outbound and inbound emails.<\/p>\n
However, there are other parts missing like anti-spam service, digital signatures using opendkim, filter rules etc for a full-featured mail server. In the next few related articles, we will be adding additional features to the set-up so stay tuned.<\/p>\n
Update: Part 4 – How to install and integrate SpamAssassin with Postfix on a CentOS 6 VPS<\/a><\/p>\n
Update: Part 5 – How to install and integrate OpenDKIM with Postfix on a CentOS 6 VPS<\/a><\/p>\n
Update: Part 6 – How to set-up server-side email filtering with Dovecot Sieve and Roundcube on a CentOS 6 VPS<\/a><\/p>\n
\n
Of course, if you are one of our Linux VPS Hosting<\/a> customers, you don\u2019t have to do any of this, simply ask our admins, sit back and relax. Our admins will set this up for you immediately.<\/p>\n
PS.<\/strong> If you liked this post please share it with your friends on the social networks using the buttons on the left or simply leave a reply below. Thanks.<\/p>\n","protected":false},"excerpt":{"rendered":"
This article is part 3 of our part 1 mailserver set-up with virtual users and domains using Postfix and Dovecot … <\/p>\n
Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":2807,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1706,1703,13,1707],"tags":[37,71,344,72,220,74],"class_list":["post-2804","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-email-servers","category-security","category-tutorials","category-web-servers","tag-apache","tag-dovecot","tag-encryption","tag-openssl","tag-postfix","tag-ssl","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-33"],"yoast_head":"\nSet-up SSL encrypted connection in Postfix, Dovecot and Apache | RoseHosting<\/title>\n<meta name=\"description\" content=\"Set-up SSL encrypted connection in Postfix, Dovecot and Apache | RoseHosting\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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