[Linux] Generate custom SSL for local use

generateSSL.sh

#!/bin/bash

# Author: Mattias Ghodsian
# Donate Eth: 0xBBB96204E45D11C9799c6B12E6eE6F0d4A071Ef5
# Donate coffee: https://www.buymeacoffee.com/mattiasghodsian

if [ -z "$1" ]; then
    echo "Usage: ./generate.sh yourdomain.lan"
    exit 1
fi

DOMAIN=$1

echo "Generating SSL certificate for: $DOMAIN"

openssl req -x509 -newkey rsa:4096 -sha256 -days 3650 -nodes \
  -keyout "$DOMAIN.key" \
  -out "$DOMAIN.crt" \
  -subj "/CN=$DOMAIN" \
  -addext "subjectAltName=DNS:$DOMAIN,DNS:*.$DOMAIN"

echo "------------------------------------------"
echo "Done! Created files:"
echo "Private Key:  $DOMAIN.key"
echo "Certificate:  $DOMAIN.crt"
echo "------------------------------------------"