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OpenVPN Cookbook - Second Edition by Jan Just Keijser

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OpenSSL tricks - x509, pkcs12, verify output

The OpenSSL commands may seem daunting at first, but there are a lot of useful commands in the OpenSSL toolbox for viewing and managing X.509 certificates and private keys. This recipe will show how to use a few of those commands.

Getting ready

Set up the easy-rsa certificate environment using the first recipe from Chapter 2Client-server IP-only Networks, by sourcing the vars file. This recipe was performed on a computer running Fedora 22 Linux but it can easily be run on Windows or MacOS.

How to do it...

For this recipe, we need to perform the following steps:

  1. To view the subject and expiry date of a given certificate, type:
    $ cd /etc/openvpn/cookbook/keys
    $ openssl x509 -subject -enddate -noout -in client1.crt ...

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