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/*
* Copyright 2017 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.handler.ssl;
import static io.netty.handler.ssl.SslUtils.toSSLHandshakeException;
import static io.netty.util.internal.ObjectUtil.checkNotNull;
import static java.lang.Math.min;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.handler.ssl.JdkApplicationProtocolNegotiator.ProtocolSelectionListener;
import io.netty.handler.ssl.JdkApplicationProtocolNegotiator.ProtocolSelector;
import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLEngineResult;
import javax.net.ssl.SSLException;
import io.netty.util.internal.EmptyArrays;
import io.netty.util.internal.SystemPropertyUtil;
import org.conscrypt.AllocatedBuffer;
import org.conscrypt.BufferAllocator;
import org.conscrypt.Conscrypt;
import org.conscrypt.HandshakeListener;
/**
* A {@link JdkSslEngine} that uses the Conscrypt provider or SSL with ALPN.
*/
abstract class ConscryptAlpnSslEngine extends JdkSslEngine {
private static final boolean USE_BUFFER_ALLOCATOR = SystemPropertyUtil.getBoolean(
"io.netty.handler.ssl.conscrypt.useBufferAllocator", true);
static ConscryptAlpnSslEngine newClientEngine(SSLEngine engine, ByteBufAllocator alloc,
JdkApplicationProtocolNegotiator applicationNegotiator) {
return new ClientEngine(engine, alloc, applicationNegotiator);
}
static ConscryptAlpnSslEngine newServerEngine(SSLEngine engine, ByteBufAllocator alloc,
JdkApplicationProtocolNegotiator applicationNegotiator) {
return new ServerEngine(engine, alloc, applicationNegotiator);
}
private ConscryptAlpnSslEngine(SSLEngine engine, ByteBufAllocator alloc, List protocols) {
super(engine);
// Configure the Conscrypt engine to use Netty's buffer allocator. This is a trade-off of memory vs
// performance.
//
// If no allocator is provided, the engine will internally allocate a direct buffer of max packet size in
// order to optimize JNI calls (this happens the first time it is provided a non-direct buffer from the
// application).
//
// Alternatively, if an allocator is provided, no internal buffer will be created and direct buffers will be
// retrieved from the allocator on-demand.
if (USE_BUFFER_ALLOCATOR) {
Conscrypt.setBufferAllocator(engine, new BufferAllocatorAdapter(alloc));
}
// Set the list of supported ALPN protocols on the engine.
Conscrypt.setApplicationProtocols(engine, protocols.toArray(EmptyArrays.EMPTY_STRINGS));
}
/**
* Calculates the maximum size of the encrypted output buffer required to wrap the given plaintext bytes. Assumes
* as a worst case that there is one TLS record per buffer.
*
* @param plaintextBytes the number of plaintext bytes to be wrapped.
* @param numBuffers the number of buffers that the plaintext bytes are spread across.
* @return the maximum size of the encrypted output buffer required for the wrap operation.
*/
final int calculateOutNetBufSize(int plaintextBytes, int numBuffers) {
// Assuming a max of one frame per component in a composite buffer.
return calculateSpace(plaintextBytes, numBuffers, Integer.MAX_VALUE);
}
/**
* Calculate the space necessary in an out buffer to hold the max size that the given
* plaintextBytes and numBuffers can produce when encrypted. Assumes as a worst case
* that there is one TLS record per buffer.
* @param plaintextBytes the number of plaintext bytes to be wrapped.
* @param numBuffers the number of buffers that the plaintext bytes are spread across.
* @return the maximum size of the encrypted output buffer required for the wrap operation.
*/
final int calculateRequiredOutBufSpace(int plaintextBytes, int numBuffers) {
return calculateSpace(plaintextBytes, numBuffers, Conscrypt.maxEncryptedPacketLength());
}
private int calculateSpace(int plaintextBytes, int numBuffers, long maxPacketLength) {
long maxOverhead = (long) Conscrypt.maxSealOverhead(getWrappedEngine()) * numBuffers;
return (int) min(maxPacketLength, plaintextBytes + maxOverhead);
}
final SSLEngineResult unwrap(ByteBuffer[] srcs, ByteBuffer[] dests) throws SSLException {
return Conscrypt.unwrap(getWrappedEngine(), srcs, dests);
}
private static final class ClientEngine extends ConscryptAlpnSslEngine {
private final ProtocolSelectionListener protocolListener;
ClientEngine(SSLEngine engine, ByteBufAllocator alloc,
JdkApplicationProtocolNegotiator applicationNegotiator) {
super(engine, alloc, applicationNegotiator.protocols());
// Register for completion of the handshake.
Conscrypt.setHandshakeListener(engine, new HandshakeListener() {
@Override
public void onHandshakeFinished() throws SSLException {
selectProtocol();
}
});
protocolListener = checkNotNull(applicationNegotiator
.protocolListenerFactory().newListener(this, applicationNegotiator.protocols()),
"protocolListener");
}
private void selectProtocol() throws SSLException {
String protocol = Conscrypt.getApplicationProtocol(getWrappedEngine());
try {
protocolListener.selected(protocol);
} catch (Throwable e) {
throw toSSLHandshakeException(e);
}
}
}
private static final class ServerEngine extends ConscryptAlpnSslEngine {
private final ProtocolSelector protocolSelector;
ServerEngine(SSLEngine engine, ByteBufAllocator alloc,
JdkApplicationProtocolNegotiator applicationNegotiator) {
super(engine, alloc, applicationNegotiator.protocols());
// Register for completion of the handshake.
Conscrypt.setHandshakeListener(engine, new HandshakeListener() {
@Override
public void onHandshakeFinished() throws SSLException {
selectProtocol();
}
});
protocolSelector = checkNotNull(applicationNegotiator.protocolSelectorFactory()
.newSelector(this,
new LinkedHashSet(applicationNegotiator.protocols())),
"protocolSelector");
}
private void selectProtocol() throws SSLException {
try {
String protocol = Conscrypt.getApplicationProtocol(getWrappedEngine());
protocolSelector.select(protocol != null ? Collections.singletonList(protocol)
: Collections.emptyList());
} catch (Throwable e) {
throw toSSLHandshakeException(e);
}
}
}
private static final class BufferAllocatorAdapter extends BufferAllocator {
private final ByteBufAllocator alloc;
BufferAllocatorAdapter(ByteBufAllocator alloc) {
this.alloc = alloc;
}
@Override
public AllocatedBuffer allocateDirectBuffer(int capacity) {
return new BufferAdapter(alloc.directBuffer(capacity));
}
}
private static final class BufferAdapter extends AllocatedBuffer {
private final ByteBuf nettyBuffer;
private final ByteBuffer buffer;
BufferAdapter(ByteBuf nettyBuffer) {
this.nettyBuffer = nettyBuffer;
buffer = nettyBuffer.nioBuffer(0, nettyBuffer.capacity());
}
@Override
public ByteBuffer nioBuffer() {
return buffer;
}
@Override
public AllocatedBuffer retain() {
nettyBuffer.retain();
return this;
}
@Override
public AllocatedBuffer release() {
nettyBuffer.release();
return this;
}
}
}
