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/*
* 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.mqtt.exceptions.MqttClientStateExceptions;
import com.hivemq.client.internal.mqtt.handler.disconnect.MqttDisconnectEvent;
import com.hivemq.client.internal.mqtt.handler.disconnect.MqttDisconnectUtil;
import com.hivemq.client.internal.mqtt.ioc.ConnectionScope;
import com.hivemq.client.internal.mqtt.message.auth.MqttAuth;
import com.hivemq.client.internal.mqtt.message.auth.MqttAuthBuilder;
import com.hivemq.client.internal.mqtt.message.disconnect.MqttDisconnect;
import com.hivemq.client.internal.rx.CompletableFlow;
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.Mqtt5Disconnect;
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 static com.hivemq.client.mqtt.mqtt5.message.auth.Mqtt5AuthReasonCode.CONTINUE_AUTHENTICATION;
import static com.hivemq.client.mqtt.mqtt5.message.auth.Mqtt5AuthReasonCode.REAUTHENTICATE;
/**
* Enhanced reauth handling according during connection according to the MQTT 5 specification.
*
* @author Silvio Giebl
*/
@ConnectionScope
public class MqttReAuthHandler extends AbstractMqttAuthHandler {
private @Nullable CompletableFlow flow;
MqttReAuthHandler(final @NotNull MqttConnectAuthHandler connectAuthHandler) {
super(connectAuthHandler.clientConfig, connectAuthHandler.authMechanism);
}
void reauth(final @NotNull CompletableFlow flow) {
if (!clientConfig.executeInEventLoop(() -> writeReAuth(flow))) {
flow.onError(MqttClientStateExceptions.notConnected());
}
}
/**
* Sends a AUTH message with the Reason Code REAUTHENTICATE.
*
* Calls {@link Mqtt5EnhancedAuthMechanism#onReAuth(Mqtt5ClientConfig, Mqtt5AuthBuilder)}.
*
* @param flow the flow for the reauth result.
*/
private void writeReAuth(final @NotNull CompletableFlow flow) {
if (ctx == null) {
flow.onError(MqttClientStateExceptions.notConnected());
return;
}
if (state != MqttAuthState.NONE) {
flow.onError(new UnsupportedOperationException("Reauth is still pending."));
return;
}
this.flow = flow;
final MqttAuthBuilder authBuilder = new MqttAuthBuilder(REAUTHENTICATE, getMethod());
state = MqttAuthState.IN_PROGRESS_INIT;
callMechanismFuture(() -> authMechanism.onReAuth(clientConfig, authBuilder), ctx -> {
state = MqttAuthState.WAIT_FOR_SERVER;
ctx.writeAndFlush(authBuilder.build()).addListener(this);
}, (ctx, throwable) -> {
callMechanism(() -> authMechanism.onReAuthError(clientConfig, throwable));
state = MqttAuthState.NONE;
this.flow.onError(throwable);
this.flow = null;
});
}
@Override
public void channelRead(final @NotNull ChannelHandlerContext ctx, final @NotNull Object msg) {
if (msg instanceof MqttAuth) {
readAuth(ctx, (MqttAuth) msg);
} else if (msg instanceof MqttDisconnect) {
readDisconnect(ctx, (MqttDisconnect) msg);
} else {
ctx.fireChannelRead(msg);
}
}
/**
* Handles an incoming AUTH message with the Reason Code SUCCESS.
*
* - Calls {@link Mqtt5EnhancedAuthMechanism#onReAuthSuccess(Mqtt5ClientConfig, Mqtt5Auth)}.
* - Sends a DISCONNECT message if the enhanced auth mechanism did not accept the AUTH message.
*
*
* @param ctx the channel handler context.
* @param auth the incoming AUTH message.
*/
@Override
void readAuthSuccess(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 SUCCESS in no response to a client message."));
return;
}
state = MqttAuthState.IN_PROGRESS_DONE;
callMechanismFutureResult(() -> authMechanism.onReAuthSuccess(clientConfig, auth), ctx2 -> {
state = MqttAuthState.NONE;
if (flow != null) {
if (!flow.isCancelled()) {
flow.onComplete();
} else {
LOGGER.warn("Reauth was successful but the Completable has been cancelled.");
}
flow = null;
}
}, (ctx2, throwable) -> MqttDisconnectUtil.disconnect(ctx2.channel(), Mqtt5DisconnectReasonCode.NOT_AUTHORIZED,
new Mqtt5AuthException(auth, "Server auth success not accepted.")));
}
/**
* Handles an incoming AUTH message with the Reason Code REAUTHENTICATE.
*
* - Sends a DISCONNECT message if server reauth is not allowed.
* - Otherwise calls
* {@link Mqtt5EnhancedAuthMechanism#onServerReAuth(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 incoming AUTH message.
*/
@Override
void readReAuth(final @NotNull ChannelHandlerContext ctx, final @NotNull MqttAuth auth) {
if (!clientConfig.getAdvancedConfig().isAllowServerReAuth()) {
MqttDisconnectUtil.disconnect(ctx.channel(), Mqtt5DisconnectReasonCode.PROTOCOL_ERROR,
new Mqtt5AuthException(auth, "Must not receive an AUTH with reason code REAUTHENTICATE."));
return;
}
if (state != MqttAuthState.NONE) {
MqttDisconnectUtil.disconnect(ctx.channel(), Mqtt5DisconnectReasonCode.PROTOCOL_ERROR,
new Mqtt5AuthException(
auth,
"Must not receive AUTH with reason code REAUTHENTICATE if reauth is still pending."));
return;
}
final MqttAuthBuilder authBuilder = new MqttAuthBuilder(CONTINUE_AUTHENTICATION, getMethod());
state = MqttAuthState.IN_PROGRESS_INIT;
callMechanismFutureResult(() -> authMechanism.onServerReAuth(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 reauth not accepted.")));
}
/**
* Handles an incoming DISCONNECT message.
*
* Calls {@link Mqtt5EnhancedAuthMechanism#onReAuthRejected(Mqtt5ClientConfig, Mqtt5Disconnect)}.
*
* @param ctx the channel handler context.
* @param disconnect the incoming DISCONNECT message.
*/
private void readDisconnect(final @NotNull ChannelHandlerContext ctx, final @NotNull MqttDisconnect disconnect) {
cancelTimeout();
if (state != MqttAuthState.NONE) {
callMechanism(() -> authMechanism.onReAuthRejected(clientConfig, disconnect));
state = MqttAuthState.NONE;
}
ctx.fireChannelRead(disconnect);
}
/**
* Calls {@link Mqtt5EnhancedAuthMechanism#onReAuthError(Mqtt5ClientConfig, Throwable)} with the cause why the
* channel was closed if reauth is still in progress.
*
* @param disconnectEvent the channel close event.
*/
@Override
protected void onDisconnectEvent(final @NotNull MqttDisconnectEvent disconnectEvent) {
super.onDisconnectEvent(disconnectEvent);
if (state != MqttAuthState.NONE) {
callMechanism(() -> authMechanism.onReAuthError(clientConfig, disconnectEvent.getCause()));
state = MqttAuthState.NONE;
}
if (flow != null) {
flow.onError(disconnectEvent.getCause());
flow = null;
}
}
@Override
protected @NotNull String getTimeoutReasonString() {
return "Timeout while waiting for AUTH or DISCONNECT.";
}
}