Disable 3DES cipher suites to prevent Sweet32 attack

Co-authored-by: nomeguy <85475922+nomeguy@users.noreply.github.com>

Author: Copilot

service/proxy.go

@@ -307,6 +307,15 @@ func Start() {
 			Addr: fmt.Sprintf(":%d", gatewayHttpsPort),
 			TLSConfig: &tls.Config{
 				MinVersion: tls.VersionTLS12,
+				CipherSuites: []uint16{
+					// Secure cipher suites for TLS 1.2 (excluding 3DES to prevent Sweet32 attack)
+					tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
+					tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
+					tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+					tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
+					tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
+					tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
+				},
 			},
 		}
 

service/tls_config_test.go

@@ -0,0 +1,62 @@
+// Copyright 2023 The casbin Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package service
+
+import (
+	"crypto/tls"
+	"testing"
+)
+
+// TestTLSConfigExcludes3DES verifies that the TLS configuration excludes
+// 3DES cipher suites that are vulnerable to the Sweet32 attack
+func TestTLSConfigExcludes3DES(t *testing.T) {
+	// Create the TLS config as it would be in the actual server
+	tlsConfig := &tls.Config{
+		MinVersion: tls.VersionTLS12,
+		CipherSuites: []uint16{
+			tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
+			tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
+			tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+			tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
+			tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
+			tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
+		},
+	}
+
+	// Define vulnerable 3DES cipher suites
+	vulnerableCiphers := []uint16{
+		tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA,
+		tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
+	}
+
+	// Verify that none of the vulnerable ciphers are in the allowed list
+	for _, vulnerableCipher := range vulnerableCiphers {
+		for _, allowedCipher := range tlsConfig.CipherSuites {
+			if vulnerableCipher == allowedCipher {
+				t.Errorf("Vulnerable 3DES cipher suite 0x%04X found in allowed cipher suites (Sweet32 vulnerability)", vulnerableCipher)
+			}
+		}
+	}
+
+	// Verify minimum TLS version is set to 1.2 or higher
+	if tlsConfig.MinVersion < tls.VersionTLS12 {
+		t.Errorf("Minimum TLS version should be 1.2 or higher, got: %d", tlsConfig.MinVersion)
+	}
+
+	// Verify that we have at least some secure cipher suites configured
+	if len(tlsConfig.CipherSuites) == 0 {
+		t.Error("No cipher suites configured - default cipher suites may include vulnerable 3DES")
+	}
+}