tls: limit version to 1.2 only and selected ciphers

Signed-off-by: Tuomas Katila <tuomas.katila@intel.com>

Author: tkatila

cmd/fpga_admissionwebhook/main.go

@@ -55,7 +55,14 @@ func main() {
 	ctrl.SetLogger(textlogger.NewLogger(tlConf))
 
 	tlsCfgFunc := func(cfg *tls.Config) {
-		cfg.MinVersion = tls.VersionTLS13
+		cfg.MinVersion = tls.VersionTLS12
+		cfg.MaxVersion = tls.VersionTLS12
+		cfg.CipherSuites = []uint16{
+			tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
+			tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
+			tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
+			tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+		}
 	}
 
 	webhookOptions := webhook.Options{

cmd/operator/main.go

@@ -135,7 +135,14 @@ func main() {
 	}
 
 	tlsCfgFunc := func(cfg *tls.Config) {
-		cfg.MinVersion = tls.VersionTLS13
+		cfg.MinVersion = tls.VersionTLS12
+		cfg.MaxVersion = tls.VersionTLS12
+		cfg.CipherSuites = []uint16{
+			tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
+			tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
+			tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
+			tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+		}
 	}
 
 	webhookOptions := webhook.Options{

cmd/sgx_admissionwebhook/main.go

@@ -37,7 +37,14 @@ func main() {
 	ctrl.SetLogger(textlogger.NewLogger(tlConf))
 
 	tlsCfgFunc := func(cfg *tls.Config) {
-		cfg.MinVersion = tls.VersionTLS13
+		cfg.MinVersion = tls.VersionTLS12
+		cfg.MaxVersion = tls.VersionTLS12
+		cfg.CipherSuites = []uint16{
+			tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
+			tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
+			tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
+			tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+		}
 	}
 
 	webhookOptions := webhook.Options{