Verify: SSL Certificate Under OpenSSL

Posted on in Categories last updated December 7, 2010

All UNIX / Linux applications linked against the OpenSSL libraries can verify certificates signed by a recognized certificate authority (CA). How do I verify SSL certificates using OpenSSL command line toolkit itself under UNIX like operating systems without using third party websites?

How To Verify SSL Certificate From A Shell Prompt

Posted on in Categories , , , , , , , , , , , , , , last updated May 23, 2009

How do I verify and diagnosis SSL certification installation from a Linux / UNIX shell prompt? How do I validate SSL Certificate installation and save hours of troubleshooting headaches without using a browser? How do I confirm I’ve the correct and working SSL certificates?

Howto: Linux Dovecot Secure IMAPS / POP3S SSL Server configuration

Posted on in Categories , , , , , , , , , , , last updated July 16, 2007

Q. How do I configure Dovecot IMAPS and POP3s server using SSL certificate? Can I use SSL certificates generated for Postfix mail server?

A. Dovecot is an IMAP server for Linux/UNIX-like systems, written with security primarily in mind. It also contains a small POP3 server. It supports mail in either of maildir or mbox formats.

You need to enable POP3s and IMAPS. Open default configuration file:
# vi /etc/dovecot.conf
Make sure POP3S and IMAPS are enabled:
protocols = imaps pop3s

Next you must set PEM encoded X.509 SSL/TLS certificate and private key. They’re opened before dropping root privileges, so keep the key file unreadable by anyone but root (see how create certificate CSR and configure certificates for Postfix):
ssl_cert_file = /etc/postfix/ssl/smtp.theos.in.crt
ssl_key_file = /etc/postfix/ssl/smtp.theos.in.key

If key file is password protected, give the password using ssl_key_password directive:
ssl_key_password = myPassword

Save and close the file. Restart Dovecot server:
# /etc/init.d/dovecot restart