generate-self-signed-cert-and-k8secrets.sh

#!/bin/bash

echo "Generating self-signed certificate"
# generate priv key for root CA
openssl genrsa -out rootCA.key 4096 
# generate root CA
openssl req -x509 -new -nodes -key rootCA.key -sha256 -days 1024 -out rootCA.crt -subj "/C=US/ST=test/L=test /O=test /OU=PIB/CN=*.kyverno.svc/emailAddress=test@test.com"
# generate priv key
openssl genrsa -out webhook.key 4096
# generate certificate
openssl req -new -key webhook.key -out webhook.csr -subj "/C=US/ST=test /L=test /O=test /OU=PIB/CN=kyverno-svc.kyverno.svc/emailAddress=test@test.com"
# sign the certificate using the root CA
openssl x509 -req -in webhook.csr -CA rootCA.crt -CAkey rootCA.key -CAcreateserial -out webhook.crt -days 1024 -sha256

echo "Generating corresponding kubernetes secrets for TLS pair and root CA"
# create project namespace
kubectl create ns kyverno
# create tls pair secret
kubectl -n kyverno create secret tls kyverno-svc.kyverno.svc.kyverno-tls-pair --cert=webhook.crt --key=webhook.key
# annotate tls pair secret to specify use of self-signed certificates and check if root CA is created as secret
kubectl annotate secret kyverno-svc.kyverno.svc.kyverno-tls-pair -n kyverno self-signed-cert=true
# create root CA secret
kubectl -n kyverno create secret generic kyverno-svc.kyverno.svc.kyverno-tls-ca --from-file=rootCA.crt