How to create a self-signed or trusted third-party certificate with openssl

This document (7023144) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 11

Situation

How to create a self-signed or trusted third-party certificate with openssl
 

Resolution

How to generate a self-signed or trusted third-party certificate using openssl:
 
  1. Generate a Private Key by following the steps below from a terminal window:
    • openssl genrsa -des3 -out server.key 2048
    • Type the pass phrase to protect the key and press [Enter]
    • Re-enter the pass phrase.
  2. Generate a Certificate Signing Request by following the steps below:
    • openssl req -new -key server.key -out server.csr
    • Enter the pass phrase of the private key created in Step 1.
    • Fill in the Country Name, State or Province Name, Locality Name, Organization Name, Organizational Unit Name, Common Name, Email Address.
      Note: The Common Name should be the DNS name of the server (i.e. server.mydomain.com).
    • When asked for a Challenge password and optional company name, leave it blank.
  3. To sign the certificate, please select from the following options:
    • (Trusted 3rd-party Certificate Authority) Send the Certificate-Signing Request (CSR) to the third party for their signing. The following files should be received:
      • Server certificate (public key)
      • Intermediate CA and/or bundles that chain to the Trusted Root CA
    • (Self-signed) Sign the certificate with openssl:
      • openssl x509 -req -days 730 -in server.csr -signkey server.key -out server.crt
        Note: Increase or decrease 730 as needed. This is the number of days the certificate is valid for.
      • Enter the pass phrase of the Private Key. This is the same pass phrase that was entered in Step 1.
  4. (optional) If needed, create a concatenated PEM file:
    TID 7013103 - How to create a .pem File for SSL Certificate Installations

Additional Information

TID 7015502 - Common Mistakes in SSL Certificate Management & Implementation.
TID 7013103 - How to create a .pem File for SSL Certificate Installations.
 

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:7023144
  • Creation Date: 02-Jul-2018
  • Modified Date:15-Sep-2020
    • SUSE Linux Enterprise Server

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