-
-
Save jessesanford/ba930e10d455fbd80e74b3b5ec4e8eed to your computer and use it in GitHub Desktop.
Create signed SSL cert with K8S CA
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#! /bin/bash | |
set -o errexit | |
export APP="${1:-mutateme}" | |
export NAMESPACE="${2:-default}" | |
export CSR_NAME="${APP}.${NAMESPACE}.svc" | |
echo "... creating ${app}.key" | |
openssl genrsa -out ${APP}.key 2048 | |
echo "... creating ${app}.csr" | |
cat >csr.conf<<EOF | |
[req] | |
req_extensions = v3_req | |
distinguished_name = req_distinguished_name | |
[req_distinguished_name] | |
[ v3_req ] | |
basicConstraints = CA:FALSE | |
keyUsage = nonRepudiation, digitalSignature, keyEncipherment | |
extendedKeyUsage = serverAuth | |
subjectAltName = @alt_names | |
[alt_names] | |
DNS.1 = ${APP} | |
DNS.2 = ${APP}.${NAMESPACE} | |
DNS.3 = ${CSR_NAME} | |
DNS.4 = ${CSR_NAME}.cluster.local | |
EOF | |
echo "openssl req -new -key ${APP}.key -subj \"/CN=${CSR_NAME}\" -out ${APP}.csr -config csr.conf" | |
openssl req -new -key ${APP}.key -subj "/CN=${CSR_NAME}" -out ${APP}.csr -config csr.conf | |
echo "... deleting existing csr, if any" | |
echo "kubectl delete csr ${CSR_NAME} || :" | |
kubectl delete csr ${CSR_NAME} || : | |
echo "... creating kubernetes CSR object" | |
echo "kubectl create -f -" | |
kubectl create -f - <<EOF | |
apiVersion: certificates.k8s.io/v1beta1 | |
kind: CertificateSigningRequest | |
metadata: | |
name: ${CSR_NAME} | |
spec: | |
groups: | |
- system:authenticated | |
request: $(cat ${APP}.csr | base64 | tr -d '\n') | |
usages: | |
- digital signature | |
- key encipherment | |
- server auth | |
EOF | |
SECONDS=0 | |
while true; do | |
echo "... waiting for csr to be present in kubernetes" | |
echo "kubectl get csr ${CSR_NAME}" | |
kubectl get csr ${CSR_NAME} > /dev/null 2>&1 | |
if [ "$?" -eq 0 ]; then | |
break | |
fi | |
if [[ $SECONDS -ge 60 ]]; then | |
echo "[!] timed out waiting for csr" | |
exit 1 | |
fi | |
sleep 2 | |
done | |
kubectl certificate approve ${CSR_NAME} | |
SECONDS=0 | |
while true; do | |
echo "... waiting for serverCert to be present in kubernetes" | |
echo "kubectl get csr ${CSR_NAME} -o jsonpath='{.status.certificate}'" | |
serverCert=$(kubectl get csr ${CSR_NAME} -o jsonpath='{.status.certificate}') | |
if [[ $serverCert != "" ]]; then | |
break | |
fi | |
if [[ $SECONDS -ge 60 ]]; then | |
echo "[!] timed out waiting for serverCert" | |
exit 1 | |
fi | |
sleep 2 | |
done | |
echo "... creating ${app}.pem cert file" | |
echo "\$serverCert | openssl base64 -d -A -out ${APP}.pem" | |
echo ${serverCert} | openssl base64 -d -A -out ${APP}.pem |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment