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HiveMQ MQTT Client is an MQTT 5.0 and MQTT 3.1.1 compatible and feature-rich high-performance Java client library with different API flavours and backpressure support
/*
* Copyright 2018 dc-square and the HiveMQ MQTT Client Project
*
* 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 com.hivemq.client.internal.mqtt.handler.auth;
import com.hivemq.client.internal.logging.InternalLogger;
import com.hivemq.client.internal.logging.InternalLoggerFactory;
import com.hivemq.client.internal.mqtt.MqttClientConfig;
import com.hivemq.client.internal.mqtt.datatypes.MqttUtf8StringImpl;
import com.hivemq.client.internal.mqtt.handler.disconnect.MqttDisconnectUtil;
import com.hivemq.client.internal.mqtt.handler.util.MqttTimeoutInboundHandler;
import com.hivemq.client.internal.mqtt.message.auth.MqttAuth;
import com.hivemq.client.internal.mqtt.message.auth.MqttAuthBuilder;
import com.hivemq.client.internal.util.Checks;
import com.hivemq.client.mqtt.mqtt5.Mqtt5ClientConfig;
import com.hivemq.client.mqtt.mqtt5.auth.Mqtt5EnhancedAuthMechanism;
import com.hivemq.client.mqtt.mqtt5.exceptions.Mqtt5AuthException;
import com.hivemq.client.mqtt.mqtt5.message.auth.Mqtt5Auth;
import com.hivemq.client.mqtt.mqtt5.message.auth.Mqtt5AuthBuilder;
import com.hivemq.client.mqtt.mqtt5.message.disconnect.Mqtt5DisconnectReasonCode;
import io.netty.channel.ChannelHandlerContext;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Supplier;
import static com.hivemq.client.mqtt.mqtt5.message.auth.Mqtt5AuthReasonCode.CONTINUE_AUTHENTICATION;
/**
* Base for enhanced auth handling according to the MQTT 5 specification.
*
* @author Silvio Giebl
*/
abstract class AbstractMqttAuthHandler extends MqttTimeoutInboundHandler implements MqttAuthHandler {
static final @NotNull InternalLogger LOGGER = InternalLoggerFactory.getLogger(AbstractMqttAuthHandler.class);
enum MqttAuthState {
NONE,
WAIT_FOR_SERVER,
IN_PROGRESS_INIT,
IN_PROGRESS_RESPONSE,
IN_PROGRESS_DONE
}
final @NotNull MqttClientConfig clientConfig;
final @NotNull Mqtt5EnhancedAuthMechanism authMechanism;
@NotNull MqttAuthState state = MqttAuthState.NONE;
AbstractMqttAuthHandler(
final @NotNull MqttClientConfig clientConfig, final @NotNull Mqtt5EnhancedAuthMechanism authMechanism) {
this.clientConfig = clientConfig;
this.authMechanism = authMechanism;
}
/**
* Handles an incoming AUTH message. Sends a DISCONNECT message if the AUTH message is not valid.
*
* @param ctx the channel handler context.
* @param auth the incoming AUTH message.
*/
final void readAuth(final @NotNull ChannelHandlerContext ctx, final @NotNull MqttAuth auth) {
cancelTimeout();
if (validateAuth(ctx, auth)) {
switch (auth.getReasonCode()) {
case CONTINUE_AUTHENTICATION:
readAuthContinue(ctx, auth);
break;
case SUCCESS:
readAuthSuccess(ctx, auth);
break;
case REAUTHENTICATE:
readReAuth(ctx, auth);
break;
}
}
}
/**
* Validates an incoming AUTH message.
*
* If validation fails, disconnection and closing of the channel is already handled.
*
* @param ctx the channel handler context.
* @param auth the incoming AUTH message.
* @return true if the AUTH message is valid, otherwise false.
*/
private boolean validateAuth(final @NotNull ChannelHandlerContext ctx, final @NotNull MqttAuth auth) {
if (!auth.getMethod().equals(getMethod())) {
MqttDisconnectUtil.disconnect(ctx.channel(), Mqtt5DisconnectReasonCode.PROTOCOL_ERROR,
new Mqtt5AuthException(auth, "Auth method in AUTH must be the same as in the CONNECT."));
return false;
}
return true;
}
/**
* Handles an incoming AUTH message with the Reason Code CONTINUE AUTHENTICATION.
*
* - Calls {@link Mqtt5EnhancedAuthMechanism#onContinue(Mqtt5ClientConfig, Mqtt5Auth, Mqtt5AuthBuilder)}.
* - Sends a new AUTH message if the enhanced auth mechanism accepted the incoming AUTH message.
* - Otherwise sends a DISCONNECT message.
*
*
* @param ctx the channel handler context.
* @param auth the received AUTH message.
*/
private void readAuthContinue(final @NotNull ChannelHandlerContext ctx, final @NotNull MqttAuth auth) {
if (state != MqttAuthState.WAIT_FOR_SERVER) {
MqttDisconnectUtil.disconnect(ctx.channel(), Mqtt5DisconnectReasonCode.PROTOCOL_ERROR,
new Mqtt5AuthException(auth, "Must not receive AUTH with reason code CONTINUE_AUTHENTICATION " +
"in no response to a client message."));
return;
}
final MqttAuthBuilder authBuilder = new MqttAuthBuilder(CONTINUE_AUTHENTICATION, getMethod());
state = MqttAuthState.IN_PROGRESS_RESPONSE;
callMechanismFutureResult(() -> authMechanism.onContinue(clientConfig, auth, authBuilder), ctx2 -> {
state = MqttAuthState.WAIT_FOR_SERVER;
ctx2.writeAndFlush(authBuilder.build()).addListener(this);
}, (ctx2, throwable) -> MqttDisconnectUtil.disconnect(ctx2.channel(), Mqtt5DisconnectReasonCode.NOT_AUTHORIZED,
new Mqtt5AuthException(auth, "Server auth not accepted.")));
}
/**
* Disconnects on an incoming AUTH message with the Reason Code SUCCESS.
*
* @param ctx the channel handler context.
* @param auth the incoming AUTH message.
*/
abstract void readAuthSuccess(@NotNull ChannelHandlerContext ctx, @NotNull MqttAuth auth);
/**
* Disconnects on an incoming AUTH message with the Reason Code REAUTHENTICATE.
*
* @param ctx the channel handler context.
* @param auth the incoming AUTH message.
*/
abstract void readReAuth(@NotNull ChannelHandlerContext ctx, @NotNull MqttAuth auth);
void callMechanism(final @NotNull Runnable call) {
try {
call.run();
} catch (final Throwable throwable) {
LOGGER.error("Auth cancelled. Unexpected exception thrown by auth mechanism.", throwable);
}
}
void callMechanismFuture(
final @NotNull Supplier<@NotNull CompletableFuture> supplier,
final @NotNull Consumer<@NotNull ChannelHandlerContext> onSuccess,
final @NotNull BiConsumer<@NotNull ChannelHandlerContext, @NotNull Throwable> onError) {
if (ctx == null) {
return;
}
try {
supplier.get().whenComplete((aVoid, throwable) -> clientConfig.executeInEventLoop(() -> {
if (ctx == null) {
return;
}
if (throwable != null) {
LOGGER.error("Auth cancelled. Unexpected exception thrown by auth mechanism.", throwable);
onError.accept(ctx, throwable);
} else {
onSuccess.accept(ctx);
}
}));
} catch (final Throwable throwable) {
LOGGER.error("Auth cancelled. Unexpected exception thrown by auth mechanism.", throwable);
onError.accept(ctx, throwable);
}
}
void callMechanismFutureResult(
final @NotNull Supplier<@NotNull CompletableFuture> supplier,
final @NotNull Consumer<@NotNull ChannelHandlerContext> onSuccess,
final @NotNull BiConsumer<@NotNull ChannelHandlerContext, @Nullable Throwable> onError) {
if (ctx == null) {
return;
}
try {
supplier.get().whenComplete((accepted, throwable) -> clientConfig.executeInEventLoop(() -> {
if (ctx == null) {
return;
}
if (throwable != null) {
LOGGER.error("Auth cancelled. Unexpected exception thrown by auth mechanism.", throwable);
onError.accept(ctx, throwable);
} else if (accepted == null) {
LOGGER.error("Auth cancelled. Unexpected null result returned by auth mechanism.");
onError.accept(
ctx, new NullPointerException("Result returned by auth mechanism must not be null."));
} else if (!accepted) {
onError.accept(ctx, null);
} else {
onSuccess.accept(ctx);
}
}));
} catch (final Throwable throwable) {
LOGGER.error("Auth cancelled. Unexpected exception thrown by auth mechanism.", throwable);
onError.accept(ctx, throwable);
}
}
@NotNull MqttUtf8StringImpl getMethod() {
return Checks.notImplemented(authMechanism.getMethod(), MqttUtf8StringImpl.class, "Auth method");
}
@Override
protected final long getTimeout() {
return authMechanism.getTimeout();
}
@Override
protected final @NotNull Mqtt5DisconnectReasonCode getTimeoutReasonCode() {
return Mqtt5DisconnectReasonCode.NOT_AUTHORIZED;
}
}