How to Concatenate PEM Certificates for HTTPS in Go Web Servers?

Concatenating PEM Certificates for HTTPS in Go Web Server

When setting up HTTPS for a Go web server, you often encounter a need to concatenate multiple PEM certificate files. This process is essential to create a complete certificate chain that includes both your primary certificate and intermediate certificates.

Obtaining Intermediate Certificates

Typically, you will be provided with a bundle of PEM files when you purchase an SSL certificate, including:

• csr.pem (ignored)
• private-key.pem (private key)
• website.com.crt (primary certificate)
• website.com.ca-bundle (intermediate certificates)
• website.com.zip (zipped version of the bundle)

Concatenating the Certificates

As per the documentation at https://www.kaihag.com/https-and-go/, you need to concatenate the following PEM files:

• website.com.ca-bundle (intermediate certificate(s))
• website.com.crt (primary certificate)

To do this, you can use the following command (assuming the files are in the current directory):

cat website.com.ca-bundle website.com.crt > full-cert.crt

This creates a combined certificate file named full-cert.crt, which contains both the intermediate certificates and your primary certificate.

Setting Up HTTPS in Go

Once you have a concatenated certificate file, you can use the http.ListenAndServeTLS function to start your HTTPS server in Go. Here's an example code snippet:

package main

import (
    "log"
    "net/http"
)

func handler(w http.ResponseWriter, r *http.Request) {
    w.Write([]byte("Hello, HTTPS!"))
}

func main() {
    log.Printf("About to listen on 10443. Go to https://127.0.0.1:10443/")
    err := http.ListenAndServeTLS(":10443", "full-cert.crt", "private-key.pem", nil)
    log.Fatal(err)
}

Replace full-cert.crt with the name of your concatenated certificate file and private-key.pem with the name of your private key file. Run the program and access https://127.0.0.1:10443/ to confirm that HTTPS is working correctly.

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