Fixes tls certificate issue for webhook endpoint (#1120)

When `operator-ca-tls` secret is defined operator will use that to
verify tls connections with minio tenants, however that was causing a
problem with kube-apiserver in where the certificate exposed on the
`caBundle` from tenants.minio.min.io crd will not match with the actual certificate operator is using
for the webhook https endpoint

Signed-off-by: Lenin Alevski <alevsk.8772@gmail.com>

main.go

@@ -124,17 +124,18 @@ func main() {
 	}
 
 	ctx := context.Background()
-	var caContent []byte
-	operatorCATLSCert, err := kubeClient.CoreV1().Secrets(miniov2.GetNSFromFile()).Get(ctx, "operator-ca-tls", metav1.GetOptions{})
-	// if custom ca.crt is not present in kubernetes secrets use the one stored in the pod
-	if err != nil {
-		caContent = miniov2.GetPodCAFromFile()
-	} else {
+
+	// Default kubernetes CA certificate
+	caContent := miniov2.GetPodCAFromFile()
+	// custom ca certificate to be used by operator
+	operatorCATLSCert, err := kubeClient.CoreV1().Secrets(miniov2.GetNSFromFile()).Get(ctx, cluster.OperatorTLSCASecretName, metav1.GetOptions{})
+	if err == nil && operatorCATLSCert != nil {
 		if val, ok := operatorCATLSCert.Data["ca.crt"]; ok {
-			caContent = val
+			caContent = append(caContent, val...)
+		} else if val, ok = operatorCATLSCert.Data["public.crt"]; ok {
+			caContent = append(caContent, val...)
 		}
 	}
-
 	if len(caContent) > 0 {
 		crd, err := extClient.ApiextensionsV1().CustomResourceDefinitions().Get(context.Background(), "tenants.minio.min.io", metav1.GetOptions{})
 		if err != nil {

pkg/controller/cluster/operator.go

@@ -272,19 +272,20 @@ func (c *Controller) getTransport() *http.Transport {
 	if c.transport != nil {
 		return c.transport
 	}
-
+	rootCAs := miniov2.MustGetSystemCertPool()
+	// Default kubernetes CA certificate
+	rootCAs.AppendCertsFromPEM(miniov2.GetPodCAFromFile())
 	var caContent []byte
+	// Custom ca certificate to be used by operator
 	operatorCATLSCert, err := c.kubeClientSet.CoreV1().Secrets(miniov2.GetNSFromFile()).Get(context.Background(), OperatorTLSCASecretName, metav1.GetOptions{})
-	// if custom ca.crt is not present in kubernetes secrets use the one stored in the pod
-	if err != nil {
-		caContent = miniov2.GetPodCAFromFile()
-	} else {
+	if err == nil && operatorCATLSCert != nil {
 		if val, ok := operatorCATLSCert.Data["ca.crt"]; ok {
 			caContent = val
+		} else if val, ok = operatorCATLSCert.Data["public.crt"]; ok {
+			caContent = val
 		}
 	}
 
-	rootCAs := miniov2.MustGetSystemCertPool()
 	if len(caContent) > 0 {
 		rootCAs.AppendCertsFromPEM(caContent)
 	}