dumpling: add min tls version config item (#51127)

ref pingcap/tidb#36036

dumpling/export/config.go

@@ -180,10 +180,11 @@ type Config struct {
 	CollationCompatible string
 	CsvOutputDialect    CSVDialect
 
-	Labels       prometheus.Labels       `json:"-"`
-	PromFactory  promutil.Factory        `json:"-"`
-	PromRegistry promutil.Registry       `json:"-"`
-	ExtStorage   storage.ExternalStorage `json:"-"`
+	Labels        prometheus.Labels       `json:"-"`
+	PromFactory   promutil.Factory        `json:"-"`
+	PromRegistry  promutil.Registry       `json:"-"`
+	ExtStorage    storage.ExternalStorage `json:"-"`
+	MinTLSVersion uint16                  `json:"-"`
 
 	IOTotalBytes *atomic.Uint64
 	Net          string
@@ -276,10 +277,14 @@ func (conf *Config) GetDriverConfig(db string) *mysql.Config {
 	} else {
 		// Use TLS first.
 		driverCfg.AllowFallbackToPlaintext = true
+		minTLSVersion := uint16(tls.VersionTLS12)
+		if conf.MinTLSVersion != 0 {
+			minTLSVersion = conf.MinTLSVersion
+		}
 		/* #nosec G402 */
 		driverCfg.TLS = &tls.Config{
 			InsecureSkipVerify: true,
-			MinVersion:         tls.VersionTLS12,
+			MinVersion:         minTLSVersion,
 			NextProtos:         []string{"h2", "http/1.1"}, // specify `h2` to let Go use HTTP/2.
 		}
 	}
@@ -754,6 +759,7 @@ func buildTLSConfig(conf *Config) error {
 		util.WithCertAndKeyPath(conf.Security.CertPath, conf.Security.KeyPath),
 		util.WithCAContent(conf.Security.SSLCABytes),
 		util.WithCertAndKeyContent(conf.Security.SSLCertBytes, conf.Security.SSLKeyBytes),
+		util.WithMinTLSVersion(conf.MinTLSVersion),
 	)
 	if err != nil {
 		return errors.Trace(err)

pkg/util/security.go

@@ -109,6 +109,7 @@ type tlsConfigBuilder struct {
 	caPath, certPath, keyPath          string
 	caContent, certContent, keyContent []byte
 	verifyCN                           []string
+	minTLSVersion                      uint16
 }
 
 // TLSConfigOption is used to build a tls.Config in NewTLSConfig.
@@ -162,6 +163,13 @@ func WithCertAndKeyContent(certContent, keyContent []byte) TLSConfigOption {
 	}
 }
 
+// WithMinTLSVersion sets the min tls version to build a tls.Config.
+func WithMinTLSVersion(minTLSVersion uint16) TLSConfigOption {
+	return func(builder *tlsConfigBuilder) {
+		builder.minTLSVersion = minTLSVersion
+	}
+}
+
 // NewTLSConfig creates a tls.Config from the given options. If no certificate is provided, it will return (nil, nil).
 func NewTLSConfig(opts ...TLSConfigOption) (*tls.Config, error) {
 	builder := &tlsConfigBuilder{}
@@ -188,6 +196,10 @@ func NewTLSConfig(opts ...TLSConfigOption) (*tls.Config, error) {
 		NextProtos:         []string{"h2", "http/1.2"}, // specify `h2` to let Go use HTTP/2.
 	}
 
+	if builder.minTLSVersion != 0 {
+		tlsCfg.MinVersion = builder.minTLSVersion
+	}
+
 	// 1. handle client certificates
 
 	if builder.certPath != "" && builder.keyPath != "" {

pkg/util/security_test.go

@@ -175,6 +175,15 @@ func TestTLSVersion(t *testing.T) {
 			require.Error(t, err)
 		}
 	}
+
+	// test with min tls version
+	clientTLS2, err := util.NewTLSConfig(
+		util.WithCAContent(caData),
+		util.WithCertAndKeyContent(clientCert, clientKey),
+		util.WithMinTLSVersion(tls.VersionTLS13),
+	)
+	require.NoError(t, err)
+	require.Equal(t, uint16(tls.VersionTLS13), clientTLS2.MinVersion)
 }
 
 func TestCA(t *testing.T) {