Mirror von
https://github.com/PaperMC/Velocity.git
synchronisiert 2024-12-26 00:00:55 +01:00
Capture a consistent and reusable 'last seen' state for use in command packets
Dieser Commit ist enthalten in:
Gegy
Riley Park
Ursprung
ec9745769f
Commit
b5ee9dd20a
@ -54,6 +54,7 @@ import com.velocitypowered.proxy.protocol.packet.ServerboundCookieResponsePacket
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import com.velocitypowered.proxy.protocol.packet.TabCompleteRequestPacket;
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import com.velocitypowered.proxy.protocol.packet.TabCompleteResponsePacket;
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import com.velocitypowered.proxy.protocol.packet.TabCompleteResponsePacket.Offer;
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import com.velocitypowered.proxy.protocol.packet.chat.ChatAcknowledgementPacket;
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import com.velocitypowered.proxy.protocol.packet.chat.ChatHandler;
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import com.velocitypowered.proxy.protocol.packet.chat.ChatTimeKeeper;
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import com.velocitypowered.proxy.protocol.packet.chat.CommandHandler;
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@ -423,6 +424,15 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
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return true;
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}
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@Override
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public boolean handle(ChatAcknowledgementPacket packet) {
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if (player.getCurrentServer().isEmpty()) {
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return true;
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}
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player.getChatQueue().handleAcknowledgement(packet.offset());
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return true;
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}
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@Override
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public boolean handle(ServerboundCookieResponsePacket packet) {
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server.getEventManager()
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@ -54,4 +54,8 @@ public class ChatAcknowledgementPacket implements MinecraftPacket {
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"offset=" + offset +
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'}';
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}
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public int offset() {
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return offset;
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}
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}
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@ -23,7 +23,9 @@ import com.velocitypowered.proxy.protocol.MinecraftPacket;
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import io.netty.channel.ChannelFuture;
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import org.checkerframework.checker.nullness.qual.Nullable;
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import java.time.Instant;
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import java.util.BitSet;
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import java.util.concurrent.CompletableFuture;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.function.Function;
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/**
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@ -64,13 +66,15 @@ public class ChatQueue {
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* packets. This maintains order on the server-level for the client insertions of commands
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* and messages. All entries are locked through an internal object lock.
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*
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* @param nextPacket the {@link CompletableFuture} which will provide the next-processed packet.
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* @param timestamp the new {@link Instant} timestamp of this packet to update the internal chat state.
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* @param nextPacket a function mapping {@link LastSeenMessages} state to a {@link CompletableFuture} that will
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* provide the next-processed packet. This should include the fixed {@link LastSeenMessages}.
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* @param timestamp the new {@link Instant} timestamp of this packet to update the internal chat state.
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* @param lastSeenMessages the new {@link LastSeenMessages} last seen messages to update the internal chat state.
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*/
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public void queuePacket(CompletableFuture<MinecraftPacket> nextPacket, @Nullable Instant timestamp) {
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public void queuePacket(Function<LastSeenMessages, CompletableFuture<MinecraftPacket>> nextPacket, @Nullable Instant timestamp, @Nullable LastSeenMessages lastSeenMessages) {
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queueTask((chatState, smc) -> {
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chatState.update(timestamp);
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return nextPacket.thenCompose(packet -> writePacket(packet, smc));
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LastSeenMessages newLastSeenMessages = chatState.updateFromMessage(timestamp, lastSeenMessages);
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return nextPacket.apply(newLastSeenMessages).thenCompose(packet -> writePacket(packet, smc));
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});
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}
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@ -88,6 +92,16 @@ public class ChatQueue {
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});
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}
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public void handleAcknowledgement(int offset) {
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queueTask((chatState, smc) -> {
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int ackCountToForward = chatState.accumulateAckCount(offset);
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if (ackCountToForward > 0) {
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return writePacket(new ChatAcknowledgementPacket(ackCountToForward), smc);
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}
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return CompletableFuture.completedFuture(null);
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});
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}
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private static <T extends MinecraftPacket> CompletableFuture<Void> writePacket(T packet, MinecraftConnection smc) {
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return CompletableFuture.runAsync(() -> {
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if (!smc.isClosed()) {
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@ -103,16 +117,64 @@ public class ChatQueue {
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CompletableFuture<Void> update(ChatState chatState, MinecraftConnection smc);
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}
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/**
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* Tracks the last Secure Chat state that we received from the client. This is important to always have a valid 'last
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* seen' state that is consistent with future and past updates from the client (which may be signed). This state is
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* used to construct 'spoofed' command packets from the proxy to the server.
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* <ul>
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* <li>If we last forwarded a chat or command packet from the client, we have a known 'last seen' that we can
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* reuse.</li>
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* <li>If we last forwarded a {@link ChatAcknowledgementPacket}, the previous 'last seen' cannot be reused. We
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* cannot predict an up-to-date 'last seen', as we do not know which messages the client actually saw.</li>
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* <li>Therefore, we need to hold back any acknowledgement packets so that we can continue to reuse the last valid
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* 'last seen' state.</li>
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* <li>However, there is a limit to the number of messages that can remain unacknowledged on the server.</li>
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* <li>To address this, we know that if the client has moved its 'last seen' window far enough, we can fill in the
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* gap with dummy 'last seen', and it will never be checked.</li>
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* </ul>
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*
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* Note that this is effectively unused for 1.20.5+ clients, as commands without any signature do not send 'last seen'
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* updates.
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*/
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public static class ChatState {
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private static final int MINIMUM_DELAYED_ACK_COUNT = LastSeenMessages.WINDOW_SIZE;
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private static final BitSet DUMMY_LAST_SEEN_MESSAGES = new BitSet();
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public volatile Instant lastTimestamp = Instant.EPOCH;
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private volatile BitSet lastSeenMessages = new BitSet();
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private final AtomicInteger delayedAckCount = new AtomicInteger();
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private ChatState() {
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}
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public void update(@Nullable Instant timestamp) {
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@Nullable
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public LastSeenMessages updateFromMessage(@Nullable Instant timestamp, @Nullable LastSeenMessages lastSeenMessages) {
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if (timestamp != null) {
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this.lastTimestamp = timestamp;
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}
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if (lastSeenMessages != null) {
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// We held back some acknowledged messages, so flush that out now that we have a known 'last seen' state again
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int delayedAckCount = this.delayedAckCount.getAndSet(0);
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this.lastSeenMessages = lastSeenMessages.getAcknowledged();
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return lastSeenMessages.offset(delayedAckCount);
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}
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return null;
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}
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public int accumulateAckCount(int ackCount) {
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int delayedAckCount = this.delayedAckCount.addAndGet(ackCount);
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int ackCountToForward = delayedAckCount - MINIMUM_DELAYED_ACK_COUNT;
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if (ackCountToForward >= LastSeenMessages.WINDOW_SIZE) {
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// Because we only forward acknowledgements above the window size, we don't have to shift the previous 'last seen' state
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this.lastSeenMessages = DUMMY_LAST_SEEN_MESSAGES;
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this.delayedAckCount.set(MINIMUM_DELAYED_ACK_COUNT);
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return ackCountToForward;
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}
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return 0;
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}
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public LastSeenMessages createLastSeen() {
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return new LastSeenMessages(0, lastSeenMessages);
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}
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}
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}
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@ -23,11 +23,13 @@ import com.velocitypowered.proxy.connection.client.ConnectedPlayer;
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import com.velocitypowered.proxy.protocol.MinecraftPacket;
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import java.time.Instant;
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import java.util.concurrent.CompletableFuture;
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import java.util.function.BiFunction;
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import java.util.function.Function;
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import net.kyori.adventure.text.Component;
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import net.kyori.adventure.text.format.NamedTextColor;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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import org.checkerframework.checker.nullness.qual.Nullable;
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public interface CommandHandler<T extends MinecraftPacket> {
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@ -53,11 +55,12 @@ public interface CommandHandler<T extends MinecraftPacket> {
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}
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default void queueCommandResult(VelocityServer server, ConnectedPlayer player,
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Function<CommandExecuteEvent, CompletableFuture<MinecraftPacket>> futurePacketCreator,
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String message, Instant timestamp) {
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player.getChatQueue().queuePacket(
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server.getCommandManager().callCommandEvent(player, message)
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.thenComposeAsync(futurePacketCreator)
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BiFunction<CommandExecuteEvent, LastSeenMessages, CompletableFuture<MinecraftPacket>> futurePacketCreator,
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String message, Instant timestamp, @Nullable LastSeenMessages lastSeenMessages) {
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CompletableFuture<CommandExecuteEvent> eventFuture = server.getCommandManager().callCommandEvent(player, message);
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player.getChatQueue().queuePacket(
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newLastSeenMessages -> eventFuture
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.thenComposeAsync(event -> futurePacketCreator.apply(event, newLastSeenMessages))
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.thenApply(pkt -> {
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if (server.getConfiguration().isLogCommandExecutions()) {
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logger.info("{} -> executed command /{}", player, message);
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@ -68,6 +71,6 @@ public interface CommandHandler<T extends MinecraftPacket> {
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player.sendMessage(
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Component.translatable("velocity.command.generic-error", NamedTextColor.RED));
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return null;
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}), timestamp);
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}), timestamp, lastSeenMessages);
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}
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}
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@ -24,7 +24,8 @@ import java.util.BitSet;
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public class LastSeenMessages {
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private static final int DIV_FLOOR = -Math.floorDiv(-20, 8);
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public static final int WINDOW_SIZE = 20;
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private static final int DIV_FLOOR = -Math.floorDiv(-WINDOW_SIZE, 8);
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private int offset;
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private BitSet acknowledged;
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@ -33,6 +34,11 @@ public class LastSeenMessages {
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this.acknowledged = new BitSet();
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}
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public LastSeenMessages(int offset, BitSet acknowledged) {
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this.offset = offset;
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this.acknowledged = acknowledged;
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}
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public LastSeenMessages(ByteBuf buf) {
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this.offset = ProtocolUtils.readVarInt(buf);
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@ -54,6 +60,14 @@ public class LastSeenMessages {
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return this.offset;
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}
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public BitSet getAcknowledged() {
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return acknowledged;
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}
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public LastSeenMessages offset(final int offset) {
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return new LastSeenMessages(this.offset + offset, acknowledged);
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}
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@Override
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public String toString() {
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return "LastSeenMessages{" +
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@ -91,11 +91,12 @@ public class KeyedChatHandler implements
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});
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}
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chatQueue.queuePacket(
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chatFuture.exceptionally((ex) -> {
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newLastSeen -> chatFuture.exceptionally((ex) -> {
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logger.error("Exception while handling player chat for {}", player, ex);
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return null;
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}),
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packet.getExpiry()
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packet.getExpiry(),
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null
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);
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}
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@ -43,7 +43,7 @@ public class KeyedCommandHandler implements CommandHandler<KeyedPlayerCommandPac
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@Override
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public void handlePlayerCommandInternal(KeyedPlayerCommandPacket packet) {
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queueCommandResult(this.server, this.player, event -> {
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queueCommandResult(this.server, this.player, (event, newLastSeenMessages) -> {
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CommandExecuteEvent.CommandResult result = event.getResult();
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IdentifiedKey playerKey = player.getIdentifiedKey();
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if (result == CommandExecuteEvent.CommandResult.denied()) {
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@ -111,6 +111,6 @@ public class KeyedCommandHandler implements CommandHandler<KeyedPlayerCommandPac
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}
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return null;
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});
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}, packet.getCommand(), packet.getTimestamp());
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}, packet.getCommand(), packet.getTimestamp(), null);
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}
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}
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@ -42,7 +42,7 @@ public class LegacyCommandHandler implements CommandHandler<LegacyChatPacket> {
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@Override
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public void handlePlayerCommandInternal(LegacyChatPacket packet) {
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String command = packet.getMessage().substring(1);
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queueCommandResult(this.server, this.player, event -> {
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queueCommandResult(this.server, this.player, (event, newLastSeenMessages) -> {
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CommandExecuteEvent.CommandResult result = event.getResult();
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if (result == CommandExecuteEvent.CommandResult.denied()) {
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return CompletableFuture.completedFuture(null);
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@ -62,6 +62,6 @@ public class LegacyCommandHandler implements CommandHandler<LegacyChatPacket> {
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}
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return null;
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});
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}, command, Instant.now());
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}, command, Instant.now(), null);
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}
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}
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@ -29,6 +29,8 @@ import com.velocitypowered.proxy.protocol.packet.chat.ChatQueue;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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import java.util.concurrent.CompletableFuture;
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public class SessionChatHandler implements ChatHandler<SessionPlayerChatPacket> {
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private static final Logger logger = LogManager.getLogger(SessionChatHandler.class);
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@ -51,8 +53,9 @@ public class SessionChatHandler implements ChatHandler<SessionPlayerChatPacket>
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ChatQueue chatQueue = this.player.getChatQueue();
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EventManager eventManager = this.server.getEventManager();
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PlayerChatEvent toSend = new PlayerChatEvent(player, packet.getMessage());
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CompletableFuture<PlayerChatEvent> eventFuture = eventManager.fire(toSend);
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chatQueue.queuePacket(
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eventManager.fire(toSend)
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newLastSeenMessages -> eventFuture
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.thenApply(pme -> {
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PlayerChatEvent.ChatResult chatResult = pme.getResult();
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if (!chatResult.isAllowed()) {
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@ -72,13 +75,14 @@ public class SessionChatHandler implements ChatHandler<SessionPlayerChatPacket>
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.setTimestamp(packet.timestamp)
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.toServer();
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}
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return packet;
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return packet.withLastSeenMessages(newLastSeenMessages);
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})
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.exceptionally((ex) -> {
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logger.error("Exception while handling player chat for {}", player, ex);
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return null;
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}),
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packet.getTimestamp()
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packet.getTimestamp(),
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packet.getLastSeenMessages()
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);
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}
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}
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@ -93,23 +93,25 @@ public class SessionCommandHandler implements CommandHandler<SessionPlayerComman
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@Override
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public void handlePlayerCommandInternal(SessionPlayerCommandPacket packet) {
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queueCommandResult(this.server, this.player, event -> {
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queueCommandResult(this.server, this.player, (event, newLastSeenMessages) -> {
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SessionPlayerCommandPacket fixedPacket = packet.withLastSeenMessages(newLastSeenMessages);
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CommandExecuteEvent.CommandResult result = event.getResult();
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if (result == CommandExecuteEvent.CommandResult.denied()) {
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return CompletableFuture.completedFuture(consumeCommand(packet));
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return CompletableFuture.completedFuture(consumeCommand(fixedPacket));
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}
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String commandToRun = result.getCommand().orElse(packet.command);
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String commandToRun = result.getCommand().orElse(fixedPacket.command);
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if (result.isForwardToServer()) {
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return CompletableFuture.completedFuture(forwardCommand(packet, commandToRun));
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return CompletableFuture.completedFuture(forwardCommand(fixedPacket, commandToRun));
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}
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return runCommand(this.server, this.player, commandToRun, hasRun -> {
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if (hasRun) {
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return consumeCommand(packet);
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return consumeCommand(fixedPacket);
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}
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return forwardCommand(packet, commandToRun);
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return forwardCommand(fixedPacket, commandToRun);
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});
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}, packet.command, packet.timeStamp);
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}, packet.command, packet.timeStamp, packet.lastSeenMessages);
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}
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}
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@ -99,4 +99,15 @@ public class SessionPlayerChatPacket implements MinecraftPacket {
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buf.readBytes(signature);
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return signature;
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}
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public SessionPlayerChatPacket withLastSeenMessages(LastSeenMessages lastSeenMessages) {
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SessionPlayerChatPacket packet = new SessionPlayerChatPacket();
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packet.message = message;
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packet.timestamp = timestamp;
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packet.salt = salt;
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packet.signed = signed;
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packet.signature = signature;
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packet.lastSeenMessages = lastSeenMessages;
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return packet;
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}
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}
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@ -25,6 +25,8 @@ import com.velocitypowered.proxy.protocol.ProtocolUtils;
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import com.velocitypowered.proxy.protocol.packet.chat.LastSeenMessages;
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import com.velocitypowered.proxy.util.except.QuietDecoderException;
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import io.netty.buffer.ByteBuf;
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import org.checkerframework.checker.nullness.qual.Nullable;
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import java.time.Instant;
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import java.util.List;
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@ -83,6 +85,21 @@ public class SessionPlayerCommandPacket implements MinecraftPacket {
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'}';
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}
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public SessionPlayerCommandPacket withLastSeenMessages(@Nullable LastSeenMessages lastSeenMessages) {
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if (lastSeenMessages == null) {
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UnsignedPlayerCommandPacket packet = new UnsignedPlayerCommandPacket();
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packet.command = command;
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return packet;
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}
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SessionPlayerCommandPacket packet = new SessionPlayerCommandPacket();
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packet.command = command;
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packet.timeStamp = timeStamp;
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packet.salt = salt;
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packet.argumentSignatures = argumentSignatures;
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packet.lastSeenMessages = lastSeenMessages;
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return packet;
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}
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public static class ArgumentSignatures {
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private final List<ArgumentSignature> entries;
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@ -19,7 +19,9 @@ package com.velocitypowered.proxy.protocol.packet.chat.session;
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import com.velocitypowered.api.network.ProtocolVersion;
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import com.velocitypowered.proxy.protocol.ProtocolUtils;
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import com.velocitypowered.proxy.protocol.packet.chat.LastSeenMessages;
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import io.netty.buffer.ByteBuf;
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import org.checkerframework.checker.nullness.qual.Nullable;
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public class UnsignedPlayerCommandPacket extends SessionPlayerCommandPacket {
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@ -33,6 +35,11 @@ public class UnsignedPlayerCommandPacket extends SessionPlayerCommandPacket {
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ProtocolUtils.writeString(buf, this.command);
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}
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@Override
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public SessionPlayerCommandPacket withLastSeenMessages(@Nullable LastSeenMessages lastSeenMessages) {
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return this;
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}
|
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public boolean isSigned() {
|
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return false;
|
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}
|
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