How to get a *.cer file to add a self-signed HTTPS certificate in command

Question

It is related to the this question: How to get a *.cer file to add a self-signed HTTPS certificate as trusted for Java

As mentioned in the answer:

With firefox is is done by double-clicking on the lock in the status bar, clicking on the button "View certificate", then in the "Details" tab, click on "Export..."

I am wondering if there is anyway to get the .cer file in command, so that I can get the process automated?

Answer 1

In order to interact with a server over SSL, one of the well known tools is OpenSSL . You can install it easily on your Linux or Windows. The OpenSSL has commands which could be used to retrieve SSL certificate of a server.

Take a look at the below post for step by step tutorial on retrieving server certificate through OpenSSL (pay special attention to comments in order to automate the overall process)

Quickpost: Retrieving an SSL Certificate