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Generating a Certificate Signing Request (CSR) using Apache OpenSSL

Jan 22, 2018 This post explains how to generate self signed certificates with SAN – Subject Alternative Names using openssl. It is a common but not very funny task, only a minute is needed when using this method. The example below generates a certificate with two SubAltNames: mydomain.com and www.mydomain.com. Create openssl configuration file. Is it possible to create a SSL (self-signed) certificate by specifying IP range in the SAN section of OpenSSL conf like this? IP range in SSL subject alternative name. Ask Question Asked 4 years. Now in the past there was a way to put an IP address in a SAN field of type DNS (!). This was always dodgy. But there at.

A CSR is a file containing your certificate application information, including your Public Key. Generate your CSR and then copy and paste the CSR file into the web form in the enrollment process.

To generate a pair of private key and public Certificate Signing Request (CSR) for a web server, “server”, use the following command :

openssl req -new -nodes -keyout myserver.key -out server.csr

This creates two files. The file myserver.key contains a private key; do not disclose this file to anyone. Carefully protect the private key. In particular, be sure to backup the private key, as there is no means to recover it should it be lost. The private key is used as input in the command to generate a Certificate Signing Request (CSR). You will now be asked to enter details to be entered into your CSR. What you are about to enter is what is called a Distinguished Name or a DN.

For some fields there will be a default value, If you enter ‘.’, the field will be left blank.

—–

Country Name (2 letter code) [AU]: US
State or Province Name (full name) [Some-State]: Your State
Locality Name (eg, city) []: Your City
Organization Name (eg, company) [Internet Widgits Pty Ltd]: Your Company Name
Organizational Unit Name (eg, section) []: IT
Common Name (eg, YOUR name) []: www.domain.com
Email Address []:

Please enter the following ‘extra’ attributes to be sent with your certificate request

A challenge password []:
An optional company name []:

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Use the name of the web server as Common Name (CN). If the domain name is mydomain.com append the domain to the hostname (use the fully qualified domain name).

The fields email address, optional company name and challenge password can be left blank for a web server certificate.

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Your CSR will now have been created. Open the server.csr in a text editor and copy and paste the contents into the online enrollment form when requested.

Updated by Lukas SabotaWritten by Linode

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If you’re generating your own SSL certificates, you may wish to create a certificate that is valid for multiple DNS names. Using this approach, you can host multiple SSL sites on a single IP address. We assume you’ve completed the steps detailed in our getting started guide, and that you’re logged into your Linode as root via an SSH session.

Install OpenSSL

Issue the following command to install required packages for OpenSSL, the open source SSL toolkit.

Debian/Ubuntu users:

CentOS/Fedora users:

Generate the Certificate

Edit the file openssl.cnf, inserting the following line immediately before the “HOME” entry. On Debian and Ubuntu systems this file can found at /usr/lib/ssl/openssl.cnf, on CentOS and Fedora it can be found at /etc/pki/tls/openssl.cnf.

openssl.cnf

Change “example.com” to match the domain name used for your server’s fully qualified domain name (FQDN). Next, add the following line immediately after the [ v3_req ] and [ v3_ca ] section markers.

openssl.cnf

Openssl Generate Certificate Key With Ip Address Code

These statements instruct OpenSSL to append your default support email address to the SAN field for new SSL certificates if no other alternate names are provided. The environment variable “SAN” will be read to obtain a list of alternate DNS names that should be considered valid for new certificates.

At the shell prompt, issue the following command to declare the names domain names that you want to include in your certificate:

Substitute your own domain names for “firstsite.org” and “secondsite.org”, adding additional domains delimited by commas. For convenience sake, we’re including the base domains for each site here (this prevents errors that would otherwise occur if the user doesn’t type the “www” part).

Issue the following command to generate the certificate itself. Note that this command should be issued on a single line, without the backslash (e.g. ):

OpenSSL will ask you for several configuration values. Enter values appropriate for your organization and server, as shown here. This example will create a certificate valid for 365 days; you may wish to increase this value. We’ve specified the FQDN (fully qualified domain name) of the Linode for the “Common Name” entry, as this certificate will be used for generic SSL service.

You’ll need to configure the applicable server software on your Linode to use the newly generated certificate. After accepting an initial warning regarding the certificate for the first domain you access over SSL, you should be able to access the domains you specified over SSL without further warnings.

More Information

You may wish to consult the following resources for additional information on this topic. While these are provided in the hope that they will be useful, please note that we cannot vouch for the accuracy or timeliness of externally hosted materials.

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Openssl Generate Certificate Key With Ip Address Free

This guide is published under a CC BY-ND 4.0 license.