forked from grpc/grpc-java
/
FakeTsiHandshaker.java
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/
FakeTsiHandshaker.java
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/*
* Copyright 2018 The gRPC Authors
*
* Licensed 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
*
* http://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.grpc.alts.internal;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.common.base.Preconditions;
import io.grpc.alts.internal.TsiPeer.Property;
import io.netty.buffer.ByteBufAllocator;
import java.nio.ByteBuffer;
import java.security.GeneralSecurityException;
import java.util.Collections;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* A fake handshaker compatible with security/transport_security/fake_transport_security.h See
* {@link TsiHandshaker} for documentation.
*/
public class FakeTsiHandshaker implements TsiHandshaker {
private static final Logger logger = Logger.getLogger(FakeTsiHandshaker.class.getName());
private static final TsiHandshakerFactory clientHandshakerFactory =
new TsiHandshakerFactory() {
@Override
public TsiHandshaker newHandshaker(String authority) {
return new FakeTsiHandshaker(true);
}
};
private static final TsiHandshakerFactory serverHandshakerFactory =
new TsiHandshakerFactory() {
@Override
public TsiHandshaker newHandshaker(String authority) {
return new FakeTsiHandshaker(false);
}
};
private boolean isClient;
private ByteBuffer sendBuffer = null;
private AltsFraming.Parser frameParser = new AltsFraming.Parser();
private State sendState;
private State receiveState;
enum State {
CLIENT_NONE,
SERVER_NONE,
CLIENT_INIT,
SERVER_INIT,
CLIENT_FINISHED,
SERVER_FINISHED;
// Returns the next State. In order to advance to sendState=N, receiveState must be N-1.
public State next() {
if (ordinal() + 1 < values().length) {
return values()[ordinal() + 1];
}
throw new UnsupportedOperationException("Can't call next() on last element: " + this);
}
}
public static TsiHandshakerFactory clientHandshakerFactory() {
return clientHandshakerFactory;
}
public static TsiHandshakerFactory serverHandshakerFactory() {
return serverHandshakerFactory;
}
public static TsiHandshaker newFakeHandshakerClient() {
return clientHandshakerFactory.newHandshaker(null);
}
public static TsiHandshaker newFakeHandshakerServer() {
return serverHandshakerFactory.newHandshaker(null);
}
protected FakeTsiHandshaker(boolean isClient) {
this.isClient = isClient;
if (isClient) {
sendState = State.CLIENT_NONE;
receiveState = State.SERVER_NONE;
} else {
sendState = State.SERVER_NONE;
receiveState = State.CLIENT_NONE;
}
}
private State getNextState(State state) {
switch (state) {
case CLIENT_NONE:
return State.CLIENT_INIT;
case SERVER_NONE:
return State.SERVER_INIT;
case CLIENT_INIT:
return State.CLIENT_FINISHED;
case SERVER_INIT:
return State.SERVER_FINISHED;
default:
return null;
}
}
private String getNextMessage() {
State result = getNextState(sendState);
return result == null ? "BAD STATE" : result.toString();
}
private String getExpectedMessage() {
State result = getNextState(receiveState);
return result == null ? "BAD STATE" : result.toString();
}
private void incrementSendState() {
sendState = getNextState(sendState);
}
private void incrementReceiveState() {
receiveState = getNextState(receiveState);
}
@Override
public void getBytesToSendToPeer(ByteBuffer bytes) throws GeneralSecurityException {
Preconditions.checkNotNull(bytes);
// If we're done, return nothing.
if (sendState == State.CLIENT_FINISHED || sendState == State.SERVER_FINISHED) {
return;
}
// Prepare the next message, if neeeded.
if (sendBuffer == null) {
if (sendState.next() != receiveState) {
// We're still waiting for bytes from the peer, so bail.
return;
}
ByteBuffer payload = ByteBuffer.wrap(getNextMessage().getBytes(UTF_8));
sendBuffer = AltsFraming.toFrame(payload, payload.remaining());
logger.log(Level.FINE, "Buffered message: {0}", getNextMessage());
}
while (bytes.hasRemaining() && sendBuffer.hasRemaining()) {
bytes.put(sendBuffer.get());
}
if (!sendBuffer.hasRemaining()) {
// Get ready to send the next message.
sendBuffer = null;
incrementSendState();
}
}
@Override
public boolean processBytesFromPeer(ByteBuffer bytes) throws GeneralSecurityException {
Preconditions.checkNotNull(bytes);
frameParser.readBytes(bytes);
if (frameParser.isComplete()) {
ByteBuffer messageBytes = frameParser.getRawFrame();
int offset = AltsFraming.getFramingOverhead();
int length = messageBytes.limit() - offset;
@SuppressWarnings("ByteBufferBackingArray") // ByteBuffer is created using allocate()
String message = new String(messageBytes.array(), offset, length, UTF_8);
logger.log(Level.FINE, "Read message: {0}", message);
if (!message.equals(getExpectedMessage())) {
throw new IllegalArgumentException(
"Bad handshake message. Got "
+ message
+ " (length = "
+ message.length()
+ ") expected "
+ getExpectedMessage()
+ " (length = "
+ getExpectedMessage().length()
+ ")");
}
incrementReceiveState();
return true;
}
return false;
}
@Override
public boolean isInProgress() {
boolean finishedReceiving =
receiveState == State.CLIENT_FINISHED || receiveState == State.SERVER_FINISHED;
boolean finishedSending =
sendState == State.CLIENT_FINISHED || sendState == State.SERVER_FINISHED;
return !finishedSending || !finishedReceiving;
}
@Override
public TsiPeer extractPeer() {
return new TsiPeer(Collections.<Property<?>>emptyList());
}
@Override
public Object extractPeerObject() {
return AltsAuthContext.getDefaultInstance();
}
@Override
public TsiFrameProtector createFrameProtector(int maxFrameSize, ByteBufAllocator alloc) {
Preconditions.checkState(!isInProgress(), "Handshake is not complete.");
// We use an all-zero key, since this is the fake handshaker.
byte[] key = new byte[AltsChannelCrypter.getKeyLength()];
return new AltsTsiFrameProtector(maxFrameSize, new AltsChannelCrypter(key, isClient), alloc);
}
@Override
public TsiFrameProtector createFrameProtector(ByteBufAllocator alloc) {
return createFrameProtector(AltsTsiFrameProtector.getMaxAllowedFrameBytes(), alloc);
}
@Override
public void close() {
// No-op
}
}