--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/classes/sun/security/ssl/ALPNExtension.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,168 @@
+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package sun.security.ssl;
+
+import java.io.IOException;
+import java.nio.charset.*;
+import java.util.*;
+
+import javax.net.ssl.*;
+
+/*
+ * [RFC 7301]
+ * This TLS extension facilitates the negotiation of application-layer protocols
+ * within the TLS handshake. Clients MAY include an extension of type
+ * "application_layer_protocol_negotiation" in the (extended) ClientHello
+ * message. The "extension_data" field of this extension SHALL contain a
+ * "ProtocolNameList" value:
+ *
+ * enum {
+ * application_layer_protocol_negotiation(16), (65535)
+ * } ExtensionType;
+ *
+ * opaque ProtocolName<1..2^8-1>;
+ *
+ * struct {
+ * ProtocolName protocol_name_list<2..2^16-1>
+ * } ProtocolNameList;
+ */
+final class ALPNExtension extends HelloExtension {
+
+ final static int ALPN_HEADER_LENGTH = 1;
+ final static int MAX_APPLICATION_PROTOCOL_LENGTH = 255;
+ final static int MAX_APPLICATION_PROTOCOL_LIST_LENGTH = 65535;
+ private int listLength = 0; // ProtocolNameList length
+ private List<String> protocolNames = null;
+
+ // constructor for ServerHello
+ ALPNExtension(String protocolName) throws SSLException {
+ this(new String[]{ protocolName });
+ }
+
+ // constructor for ClientHello
+ ALPNExtension(String[] protocolNames) throws SSLException {
+ super(ExtensionType.EXT_ALPN);
+ if (protocolNames.length == 0) { // never null, never empty
+ throw new IllegalArgumentException(
+ "The list of application protocols cannot be empty");
+ }
+ this.protocolNames = Arrays.asList(protocolNames);
+ for (String p : protocolNames) {
+ int length = p.getBytes(StandardCharsets.UTF_8).length;
+ if (length == 0) {
+ throw new SSLProtocolException(
+ "Application protocol name is empty");
+ }
+ if (length <= MAX_APPLICATION_PROTOCOL_LENGTH) {
+ listLength += length + ALPN_HEADER_LENGTH;
+ } else {
+ throw new SSLProtocolException(
+ "Application protocol name is too long: " + p);
+ }
+ if (listLength > MAX_APPLICATION_PROTOCOL_LIST_LENGTH) {
+ throw new SSLProtocolException(
+ "Application protocol name list is too long");
+ }
+ }
+ }
+
+ // constructor for ServerHello for parsing ALPN extension
+ ALPNExtension(HandshakeInStream s, int len) throws IOException {
+ super(ExtensionType.EXT_ALPN);
+
+ if (len >= 2) {
+ listLength = s.getInt16(); // list length
+ if (listLength < 2 || listLength + 2 != len) {
+ throw new SSLProtocolException(
+ "Invalid " + type + " extension: incorrect list length " +
+ "(length=" + listLength + ")");
+ }
+ } else {
+ throw new SSLProtocolException(
+ "Invalid " + type + " extension: insufficient data " +
+ "(length=" + len + ")");
+ }
+
+ int remaining = listLength;
+ this.protocolNames = new ArrayList<>();
+ while (remaining > 0) {
+ // opaque ProtocolName<1..2^8-1>; // RFC 7301
+ byte[] bytes = s.getBytes8();
+ if (bytes.length == 0) {
+ throw new SSLProtocolException("Invalid " + type +
+ " extension: empty application protocol name");
+ }
+ String p =
+ new String(bytes, StandardCharsets.UTF_8); // app protocol
+ protocolNames.add(p);
+ remaining -= bytes.length + ALPN_HEADER_LENGTH;
+ }
+
+ if (remaining != 0) {
+ throw new SSLProtocolException(
+ "Invalid " + type + " extension: extra data " +
+ "(length=" + remaining + ")");
+ }
+ }
+
+ List<String> getPeerAPs() {
+ return protocolNames;
+ }
+
+ /*
+ * Return the length in bytes, including extension type and length fields.
+ */
+ @Override
+ int length() {
+ return 6 + listLength;
+ }
+
+ @Override
+ void send(HandshakeOutStream s) throws IOException {
+ s.putInt16(type.id);
+ s.putInt16(listLength + 2); // length of extension_data
+ s.putInt16(listLength); // length of ProtocolNameList
+
+ for (String p : protocolNames) {
+ s.putBytes8(p.getBytes(StandardCharsets.UTF_8));
+ }
+ }
+
+ @Override
+ public String toString() {
+ StringBuilder sb = new StringBuilder();
+ if (protocolNames == null || protocolNames.isEmpty()) {
+ sb.append("<empty>");
+ } else {
+ for (String protocolName : protocolNames) {
+ sb.append("[" + protocolName + "]");
+ }
+ }
+
+ return "Extension " + type +
+ ", protocol names: " + sb;
+ }
+}