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The Application Gateway v2 SKU introduces the use of Trusted Root Certificates to allow backend servers. This removes authentication certificates that were required in the v1 SKU. The root certificate is a Base-64 encoded X.509(.CER) format root certificate from the backend certificate server. It identifies the root certificate authority (CA) that issued the server certificate and the server certificate is then used for the TLS/SSL communication.

Application Gateway trusts your website's certificate by default if it's signed by a well-known CA (for example, GoDaddy or DigiCert). You don't need to explicitly upload the root certificate in that case. For more information, see Overview of TLS termination and end to end TLS with Application Gateway. However, if you have a dev/test environment and don't want to purchase a verified CA signed certificate, you can create your own custom CA and create a self-signed certificate with it.

Navigate to your OpenSSL 'bin' directory and open a command prompt in the same location. Generate a CSR & Private Key: openssl req -out CSR.csr -new -newkey rsa:2048 -keyout privatekey.key. To generate a 4096-bit CSR you can replace the rsa:2048 syntax with rsa:4096 as shown below. Openssl req -out CSR.csr -new -newkey rsa:4096 -keyout privatekey.key.
I am using the following command in order to generate a CSR together with a private key by using OpenSSL: openssl req -new -subj '/CN=sample.myhost.com' -out newcsr.csr -nodes -sha512 -newkey rsa.

Note

You can do this with these steps: 1. Type the following command in an open terminal window on your computer to display the list of curves supported by your version of OpenSSL. Once you have selected a curve, then you can use the following command to create the private key file.

Self-signed certificates are not trusted by default and they can be difficult to maintain. Also, they may use outdated hash and cipher suites that may not be strong. For better security, purchase a certificate signed by a well-known certificate authority.

In this article, you will learn how to:

Create your own custom Certificate Authority
Create a self-signed certificate signed by your custom CA
Upload a self-signed root certificate to an Application Gateway to authenticate the backend server

Prerequisites

OpenSSL on a computer running Windows or Linux
While there could be other tools available for certificate management, this tutorial uses OpenSSL. You can find OpenSSL bundled with many Linux distributions, such as Ubuntu.
A web server
For example, Apache, IIS, or NGINX to test the certificates.
An Application Gateway v2 SKU
If you don't have an existing application gateway, see Quickstart: Direct web traffic with Azure Application Gateway - Azure portal.

Create a root CA certificate

Openssl Generate Cert From Csr

Create your root CA certificate using OpenSSL.

Create the root key

Sign in to your computer where OpenSSL is installed and run the following command. Git generate ssh key linux. This creates a password protected key.
Under standard security practices, every host should generate unique host keys for SSH authentication. This enables SSH verification of the host ID to prevent man-in-the-middle or other attacks before the connection is made. On Red Hat Enterprise Linux, the System Security Services Daemon (SSSD) can be configured to cache and retrieve host SSH keys so that applications and services only have to look in one location for host keys. Generate ssh host key redhat. To be able to use ssh, scp, or sftp to connect to the server from a client machine, generate an authorization key pair by following the steps below. Note that keys must be generated. This will re-generate the dsa keys for your host. This will generate a key pair for your system. Note: Administrators that have other users connecting to their sshd2 daemon should notify the users of the host-key change. If you do not, the users will receive a warning the next time they connect.
At the prompt, type a strong password. For example, at least nine characters, using upper case, lower case, numbers, and symbols.

Create a Root Certificate and self-sign it

Use the following commands to generate the csr and the certificate.
The previous commands create the root certificate. You'll use this to sign your server certificate.
When prompted, type the password for the root key, and the organizational information for the custom CA such as Country, State, Org, OU, and the fully qualified domain name (this is the domain of the issuer).

Create a server certificate

Next, you'll create a server certificate using OpenSSL.

Create the certificate's key

Use the following command to generate the key for the server certificate.

Create the CSR (Certificate Signing Request)

The CSR is a public key that is given to a CA when requesting a certificate. The CA issues the certificate for this specific request.

Note

The CN (Common Name) for the server certificate must be different from the issuer's domain. For example, in this case, the CN for the issuer is www.contoso.com and the server certificate's CN is www.fabrikam.com.

Use the following command to generate the CSR:
When prompted, type the password for the root key, and the organizational information for the custom CA: Country, State, Org, OU, and the fully qualified domain name. This is the domain of the website and it should be different from the issuer.

Generate the certificate with the CSR and the key and sign it with the CA's root key

Use the following command to create the certificate:

Verify the newly created certificate

Use the following command to print the output of the CRT file and verify its content:
Verify the files in your directory, and ensure you have the following files:
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- contoso.crt
- contoso.key
- fabrikam.crt
- fabrikam.key

Configure the certificate in your web server's TLS settings

In your web server, configure TLS using the fabrikam.crt and fabrikam.key files. If your web server can't take two files, you can combine them to a single .pem or .pfx file using OpenSSL commands.

IIS

For instructions on how to import certificate and upload them as server certificate on IIS, see HOW TO: Install Imported Certificates on a Web Server in Windows Server 2003.

For TLS binding instructions, see How to Set Up SSL on IIS 7.

Apache

The following configuration is an example virtual host configured for SSL in Apache:

NGINX

The following configuration is an example NGINX server block with TLS configuration:

Access the server to verify the configuration

Add the root certificate to your machine's trusted root store. When you access the website, ensure the entire certificate chain is seen in the browser.
Note
It's as

Openssl Generate Csr From Existing Key