TUN-5612: Add support for specifying TLS min/max version

tlsconfig/tlsconfig.go

@@ -19,6 +19,8 @@ type TLSParameters struct {
 	RootCAs          []string
 	ServerName       string
 	CurvePreferences []tls.CurveID
+	minVersion       uint16 // min tls version. If zero, TLS1.0 is defined as minimum.
+	maxVersion       uint16 // max tls version. If zero, last TLS version is used defined as limit (currently TLS1.3)
 }
 
 // GetConfig returns a TLS configuration according to the Config set by the user.
@@ -72,6 +74,9 @@ func GetConfig(p *TLSParameters) (*tls.Config, error) {
 		tlsconfig.CurvePreferences = []tls.CurveID{tls.CurveP256}
 	}
 
+	tlsconfig.MinVersion = p.minVersion
+	tlsconfig.MaxVersion = p.maxVersion
+
 	return tlsconfig, nil
 }