src/java.base/share/classes/sun/security/ssl/HandshakeMessage.java

8180643 Illegal handshake message

@@ -77,10 +77,13 @@
 
     /* Class and subclass dynamic debugging support */
     public static final Debug debug = Debug.getInstance("ssl");
 
     // enum HandshakeType:
+    //
+    // Please update the isUnsupported() method accordingly if the handshake
+    // types get updated in the future.
     static final byte   ht_hello_request          = 0;      // RFC 5246
     static final byte   ht_client_hello           = 1;      // RFC 5246
     static final byte   ht_server_hello           = 2;      // RFC 5246
     static final byte   ht_hello_verify_request   = 3;      // RFC 6347
     static final byte   ht_new_session_ticket     = 4;      // RFC 4507

@@ -128,10 +131,28 @@
             b = newarray;
         }
         return b;
     }
 
+    static boolean isUnsupported(byte handshakeType) {
+        return (handshakeType != ht_hello_request) &&
+               (handshakeType != ht_client_hello) &&
+               (handshakeType != ht_server_hello) &&
+               (handshakeType != ht_hello_verify_request) &&
+               (handshakeType != ht_new_session_ticket) &&
+               (handshakeType != ht_certificate) &&
+               (handshakeType != ht_server_key_exchange) &&
+               (handshakeType != ht_certificate_request) &&
+               (handshakeType != ht_server_hello_done) &&
+               (handshakeType != ht_certificate_verify) &&
+               (handshakeType != ht_client_key_exchange) &&
+               (handshakeType != ht_finished) &&
+               (handshakeType != ht_certificate_url) &&
+               (handshakeType != ht_certificate_status) &&
+               (handshakeType != ht_supplemental_data);
+    }
+
     private static byte[] genPad(int b, int count) {
         byte[] padding = new byte[count];
         Arrays.fill(padding, (byte)b);
         return padding;
     }