| /* |
| * Copyright (c) 2006, 2012, 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.io.PrintStream; |
| import java.util.*; |
| import javax.net.ssl.*; |
| |
| /** |
| * This file contains all the classes relevant to TLS Extensions for the |
| * ClientHello and ServerHello messages. The extension mechanism and |
| * several extensions are defined in RFC 3546. Additional extensions are |
| * defined in the ECC RFC 4492. |
| * |
| * Currently, only the two ECC extensions are fully supported. |
| * |
| * The classes contained in this file are: |
| * . HelloExtensions: a List of extensions as used in the client hello |
| * and server hello messages. |
| * . ExtensionType: an enum style class for the extension type |
| * . HelloExtension: abstract base class for all extensions. All subclasses |
| * must be immutable. |
| * |
| * . UnknownExtension: used to represent all parsed extensions that we do not |
| * explicitly support. |
| * . ServerNameExtension: the server_name extension. |
| * . SignatureAlgorithmsExtension: the signature_algorithms extension. |
| * . SupportedEllipticCurvesExtension: the ECC supported curves extension. |
| * . SupportedEllipticPointFormatsExtension: the ECC supported point formats |
| * (compressed/uncompressed) extension. |
| * |
| * @since 1.6 |
| * @author Andreas Sterbenz |
| */ |
| final class HelloExtensions { |
| |
| private List<HelloExtension> extensions; |
| private int encodedLength; |
| |
| HelloExtensions() { |
| extensions = Collections.emptyList(); |
| } |
| |
| HelloExtensions(HandshakeInStream s) throws IOException { |
| int len = s.getInt16(); |
| extensions = new ArrayList<HelloExtension>(); |
| encodedLength = len + 2; |
| while (len > 0) { |
| int type = s.getInt16(); |
| int extlen = s.getInt16(); |
| ExtensionType extType = ExtensionType.get(type); |
| HelloExtension extension; |
| if (extType == ExtensionType.EXT_SERVER_NAME) { |
| extension = new ServerNameExtension(s, extlen); |
| } else if (extType == ExtensionType.EXT_SIGNATURE_ALGORITHMS) { |
| extension = new SignatureAlgorithmsExtension(s, extlen); |
| } else if (extType == ExtensionType.EXT_ELLIPTIC_CURVES) { |
| extension = new SupportedEllipticCurvesExtension(s, extlen); |
| } else if (extType == ExtensionType.EXT_EC_POINT_FORMATS) { |
| extension = |
| new SupportedEllipticPointFormatsExtension(s, extlen); |
| } else if (extType == ExtensionType.EXT_RENEGOTIATION_INFO) { |
| extension = new RenegotiationInfoExtension(s, extlen); |
| } else { |
| extension = new UnknownExtension(s, extlen, extType); |
| } |
| extensions.add(extension); |
| len -= extlen + 4; |
| } |
| if (len != 0) { |
| throw new SSLProtocolException( |
| "Error parsing extensions: extra data"); |
| } |
| } |
| |
| // Return the List of extensions. Must not be modified by the caller. |
| List<HelloExtension> list() { |
| return extensions; |
| } |
| |
| void add(HelloExtension ext) { |
| if (extensions.isEmpty()) { |
| extensions = new ArrayList<HelloExtension>(); |
| } |
| extensions.add(ext); |
| encodedLength = -1; |
| } |
| |
| HelloExtension get(ExtensionType type) { |
| for (HelloExtension ext : extensions) { |
| if (ext.type == type) { |
| return ext; |
| } |
| } |
| return null; |
| } |
| |
| int length() { |
| if (encodedLength >= 0) { |
| return encodedLength; |
| } |
| if (extensions.isEmpty()) { |
| encodedLength = 0; |
| } else { |
| encodedLength = 2; |
| for (HelloExtension ext : extensions) { |
| encodedLength += ext.length(); |
| } |
| } |
| return encodedLength; |
| } |
| |
| void send(HandshakeOutStream s) throws IOException { |
| int length = length(); |
| if (length == 0) { |
| return; |
| } |
| s.putInt16(length - 2); |
| for (HelloExtension ext : extensions) { |
| ext.send(s); |
| } |
| } |
| |
| void print(PrintStream s) throws IOException { |
| for (HelloExtension ext : extensions) { |
| s.println(ext.toString()); |
| } |
| } |
| } |