PaperMC/patches/server/0856-Prevent-causing-expired-keys-from-impacting-new-join.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Mon, 3 Apr 2023 08:55:52 +0100
Subject: [PATCH] Prevent causing expired keys from impacting new joins


diff --git a/src/main/java/net/minecraft/network/protocol/game/ClientboundPlayerInfoUpdatePacket.java b/src/main/java/net/minecraft/network/protocol/game/ClientboundPlayerInfoUpdatePacket.java
index e4f0949b6538734ff25daf68a428262481feeb81..754a2a5e958a04b3f8bf216b6022f547aa1cd36f 100644
--- a/src/main/java/net/minecraft/network/protocol/game/ClientboundPlayerInfoUpdatePacket.java
+++ b/src/main/java/net/minecraft/network/protocol/game/ClientboundPlayerInfoUpdatePacket.java
@@ -101,7 +101,15 @@ public class ClientboundPlayerInfoUpdatePacket implements Packet<ClientGamePacke
         }),
         INITIALIZE_CHAT(
             (serialized, buf) -> serialized.chatSession = buf.readNullable(RemoteChatSession.Data::read),
-            (buf, entry) -> buf.writeNullable(entry.chatSession, RemoteChatSession.Data::write)
+            // Paper start - Prevent causing expired keys from impacting new joins
+            (buf, entry) -> {
+                RemoteChatSession.Data chatSession = entry.chatSession;
+                if (chatSession != null && chatSession.profilePublicKey().hasExpired()) {
+                    chatSession = null;
+                }
+                buf.writeNullable(chatSession, RemoteChatSession.Data::write);
+            }
+            // Paper end - Prevent causing expired keys from impacting new joins
         ),
         UPDATE_GAME_MODE((serialized, buf) -> serialized.gameMode = GameType.byId(buf.readVarInt()), (buf, entry) -> buf.writeVarInt(entry.gameMode().getId())),
         UPDATE_LISTED((serialized, buf) -> serialized.listed = buf.readBoolean(), (buf, entry) -> buf.writeBoolean(entry.listed())),
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index c9dab47fe3db73b31b40e071d37f1be63401c19d..69118af2a873f23f6543676db39263bfeb81b4f1 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -286,6 +286,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
     private int knownMovePacketCount;
     @Nullable
     private RemoteChatSession chatSession;
+    private boolean hasLoggedExpiry = false; // Paper - Prevent causing expired keys from impacting new joins
     private SignedMessageChain.Decoder signedMessageDecoder;
     private final LastSeenMessagesValidator lastSeenMessages = new LastSeenMessagesValidator(20);
     private final MessageSignatureCache messageSignatureCache = MessageSignatureCache.createDefault();
@@ -394,6 +395,13 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
             this.disconnect(Component.translatable("multiplayer.disconnect.idling"), org.bukkit.event.player.PlayerKickEvent.Cause.IDLING); // Paper - kick event cause
         }
 
+        // Paper start - Prevent causing expired keys from impacting new joins
+        if (!hasLoggedExpiry && this.chatSession != null && this.chatSession.profilePublicKey().data().hasExpired()) {
+            LOGGER.info("Player profile key for {} has expired!", this.player.getName().getString());
+            hasLoggedExpiry = true;
+        }
+        // Paper end - Prevent causing expired keys from impacting new joins
+
     }
 
     public void resetPosition() {
@@ -3337,6 +3345,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
 
     private void resetPlayerChatState(RemoteChatSession session) {
         this.chatSession = session;
+        this.hasLoggedExpiry = false; // Paper - Prevent causing expired keys from impacting new joins
         this.signedMessageDecoder = session.createMessageDecoder(this.player.getUUID());
         this.chatMessageChain.append(() -> {
             this.player.setChatSession(session);