Remove file that was added by mistake by ae7436813a
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/*
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* Copyright 2017 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.ssl;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.ByteBufUtil;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelOutboundHandler;
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import io.netty.channel.ChannelPromise;
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import io.netty.handler.codec.ByteToMessageDecoder;
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import io.netty.handler.codec.DecoderException;
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import io.netty.util.CharsetUtil;
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import io.netty.util.concurrent.Future;
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import io.netty.util.concurrent.FutureListener;
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import io.netty.util.internal.PlatformDependent;
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import io.netty.util.internal.logging.InternalLogger;
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import io.netty.util.internal.logging.InternalLoggerFactory;
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import java.net.SocketAddress;
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import java.util.List;
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import java.util.Locale;
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/**
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* <p>Enables <a href="https://tools.ietf.org/html/rfc3546#section-3.1">SNI
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* (Server Name Indication)</a> extension for server side SSL. For clients
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* support SNI, the server could have multiple host name bound on a single IP.
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* The client will send host name in the handshake data so server could decide
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* which certificate to choose for the host name.</p>
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*/
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public abstract class AbstractSniHandler<T> extends ByteToMessageDecoder implements ChannelOutboundHandler {
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// Maximal number of ssl records to inspect before fallback to the default SslContext.
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private static final int MAX_SSL_RECORDS = 4;
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private static final InternalLogger logger =
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InternalLoggerFactory.getInstance(AbstractSniHandler.class);
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private boolean handshakeFailed;
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private boolean suppressRead;
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private boolean readPending;
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@Override
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protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
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if (!suppressRead && !handshakeFailed) {
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final int writerIndex = in.writerIndex();
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try {
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loop:
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for (int i = 0; i < MAX_SSL_RECORDS; i++) {
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final int readerIndex = in.readerIndex();
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final int readableBytes = writerIndex - readerIndex;
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if (readableBytes < SslUtils.SSL_RECORD_HEADER_LENGTH) {
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// Not enough data to determine the record type and length.
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return;
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}
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final int command = in.getUnsignedByte(readerIndex);
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// tls, but not handshake command
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switch (command) {
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case SslUtils.SSL_CONTENT_TYPE_CHANGE_CIPHER_SPEC:
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case SslUtils.SSL_CONTENT_TYPE_ALERT:
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final int len = SslUtils.getEncryptedPacketLength(in, readerIndex);
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// Not an SSL/TLS packet
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if (len == SslUtils.NOT_ENCRYPTED) {
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handshakeFailed = true;
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NotSslRecordException e = new NotSslRecordException(
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"not an SSL/TLS record: " + ByteBufUtil.hexDump(in));
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in.skipBytes(in.readableBytes());
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SslUtils.notifyHandshakeFailure(ctx, e, true);
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throw e;
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}
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if (len == SslUtils.NOT_ENOUGH_DATA ||
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writerIndex - readerIndex - SslUtils.SSL_RECORD_HEADER_LENGTH < len) {
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// Not enough data
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return;
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}
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// increase readerIndex and try again.
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in.skipBytes(len);
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continue;
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case SslUtils.SSL_CONTENT_TYPE_HANDSHAKE:
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final int majorVersion = in.getUnsignedByte(readerIndex + 1);
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// SSLv3 or TLS
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if (majorVersion == 3) {
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final int packetLength = in.getUnsignedShort(readerIndex + 3) +
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SslUtils.SSL_RECORD_HEADER_LENGTH;
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if (readableBytes < packetLength) {
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// client hello incomplete; try again to decode once more data is ready.
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return;
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}
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// See https://tools.ietf.org/html/rfc5246#section-7.4.1.2
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//
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// Decode the ssl client hello packet.
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// We have to skip bytes until SessionID (which sum to 43 bytes).
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//
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// struct {
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// ProtocolVersion client_version;
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// Random random;
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// SessionID session_id;
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// CipherSuite cipher_suites<2..2^16-2>;
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// CompressionMethod compression_methods<1..2^8-1>;
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// select (extensions_present) {
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// case false:
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// struct {};
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// case true:
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// Extension extensions<0..2^16-1>;
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// };
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// } ClientHello;
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//
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final int endOffset = readerIndex + packetLength;
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int offset = readerIndex + 43;
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if (endOffset - offset < 6) {
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break loop;
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}
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final int sessionIdLength = in.getUnsignedByte(offset);
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offset += sessionIdLength + 1;
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final int cipherSuitesLength = in.getUnsignedShort(offset);
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offset += cipherSuitesLength + 2;
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final int compressionMethodLength = in.getUnsignedByte(offset);
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offset += compressionMethodLength + 1;
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final int extensionsLength = in.getUnsignedShort(offset);
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offset += 2;
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final int extensionsLimit = offset + extensionsLength;
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if (extensionsLimit > endOffset) {
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// Extensions should never exceed the record boundary.
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break loop;
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}
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for (;;) {
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if (extensionsLimit - offset < 4) {
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break loop;
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}
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final int extensionType = in.getUnsignedShort(offset);
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offset += 2;
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final int extensionLength = in.getUnsignedShort(offset);
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offset += 2;
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if (extensionsLimit - offset < extensionLength) {
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break loop;
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}
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// SNI
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// See https://tools.ietf.org/html/rfc6066#page-6
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if (extensionType == 0) {
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offset += 2;
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if (extensionsLimit - offset < 3) {
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break loop;
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}
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final int serverNameType = in.getUnsignedByte(offset);
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offset++;
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if (serverNameType == 0) {
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final int serverNameLength = in.getUnsignedShort(offset);
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offset += 2;
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if (extensionsLimit - offset < serverNameLength) {
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break loop;
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}
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final String hostname = in.toString(offset, serverNameLength,
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CharsetUtil.US_ASCII);
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try {
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select(ctx, hostname.toLowerCase(Locale.US));
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} catch (Throwable t) {
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PlatformDependent.throwException(t);
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}
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return;
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} else {
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// invalid enum value
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break loop;
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}
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}
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offset += extensionLength;
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}
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}
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// Fall-through
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default:
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//not tls, ssl or application data, do not try sni
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break loop;
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}
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}
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} catch (Throwable e) {
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// unexpected encoding, ignore sni and use default
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if (logger.isDebugEnabled()) {
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logger.debug("Unexpected client hello packet: " + ByteBufUtil.hexDump(in), e);
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}
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}
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// Just select the default SslContext
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select(ctx, null);
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}
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}
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private void select(final ChannelHandlerContext ctx, final String hostname) throws Exception {
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Future<T> future = lookup(ctx, hostname);
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if (future.isDone()) {
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onLookupComplete(ctx, hostname, future);
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} else {
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suppressRead = true;
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future.addListener(new FutureListener<T>() {
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@Override
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public void operationComplete(Future<T> future) throws Exception {
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try {
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suppressRead = false;
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try {
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onLookupComplete(ctx, hostname, future);
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} catch (DecoderException err) {
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ctx.fireExceptionCaught(err);
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} catch (Exception cause) {
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ctx.fireExceptionCaught(new DecoderException(cause));
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} catch (Throwable cause) {
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ctx.fireExceptionCaught(cause);
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}
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} finally {
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if (readPending) {
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readPending = false;
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ctx.read();
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}
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}
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}
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});
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}
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}
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/**
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* Kicks off a lookup for the given SNI value and returns a {@link Future} which in turn will
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* notify the {@link #onLookupComplete(ChannelHandlerContext, String, Future)} on completion.
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*
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* @see #onLookupComplete(ChannelHandlerContext, String, Future)
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*/
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protected abstract Future<T> lookup(ChannelHandlerContext ctx, String hostname) throws Exception;
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/**
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* Called upon completion of the {@link #lookup(ChannelHandlerContext, String)} {@link Future}.
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*
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* @see #lookup(ChannelHandlerContext, String)
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*/
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protected abstract void onLookupComplete(ChannelHandlerContext ctx,
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String hostname, Future<T> future) throws Exception;
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@Override
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public void read(ChannelHandlerContext ctx) throws Exception {
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if (suppressRead) {
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readPending = true;
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} else {
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ctx.read();
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}
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}
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@Override
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public void bind(ChannelHandlerContext ctx, SocketAddress localAddress, ChannelPromise promise) throws Exception {
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ctx.bind(localAddress, promise);
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}
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@Override
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public void connect(ChannelHandlerContext ctx, SocketAddress remoteAddress, SocketAddress localAddress,
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ChannelPromise promise) throws Exception {
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ctx.connect(remoteAddress, localAddress, promise);
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}
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@Override
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public void disconnect(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
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ctx.disconnect(promise);
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}
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@Override
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public void close(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
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ctx.close(promise);
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}
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@Override
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public void deregister(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
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ctx.deregister(promise);
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}
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@Override
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public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
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ctx.write(msg, promise);
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}
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@Override
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public void flush(ChannelHandlerContext ctx) throws Exception {
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ctx.flush();
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}
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}
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