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OpenVPN Cookbook

You're reading from   OpenVPN Cookbook Get the most out of OpenVPN by exploring it's advanced features.

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Product type Paperback
Published in Feb 2017
Publisher
ISBN-13 9781786463128
Length 400 pages
Edition 2nd Edition
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Author (1):
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Jan Just Keijser Jan Just Keijser
Author Profile Icon Jan Just Keijser
Jan Just Keijser
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Toc

Table of Contents (11) Chapters Close

Preface 1. Point-to-Point Networks FREE CHAPTER 2. Client-server IP-only Networks 3. Client-server Ethernet-style Networks 4. PKI, Certificates, and OpenSSL 5. Scripting and Plugins 6. Troubleshooting OpenVPN - Configurations 7. Troubleshooting OpenVPN - Routing 8. Performance Tuning 9. OS Integration 10. Advanced Configuration

Checking expired/revoked certificates


The goal of this recipe is to give an insight into some of the internals of the OpenSSL CA commands. We will show how a certificate's status is changed from "Valid" to "Revoked", or "Expired".

Getting ready

Set up the client and server certificates using the first recipe from Chapter 2Client-server IP-only Networks. This recipe was performed on a computer running CentOS 6 Linux but it can easily be run on Windows or Mac OS.

How to do it...

  1. Before we can use plain openssl commands, there are a few environment variables that need to be set. These variables are not set in the vars file by default:

    $ cd /etc/openvpn/cookbook
    $ . ./vars
    $ export KEY_NAME=
    $ export OPENSSL_CONF=/etc/openvpn/cookbook/openssl-1.0.0.cnf
    
  2. Now, we can query the status of a certificate using its serial number:

            $ cd keys
            $ openssl x509 -serial -noout -in server.crt
            serial=01
            $ openssl ca -status 01
            Using configuration from /etc/openvpn/cookbook...
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