1 files changed, 155 insertions, 0 deletions
diff --git a/patches/server/0924-Validate-ResourceLocation-in-NBT-reading.patch b/patches/server/0924-Validate-ResourceLocation-in-NBT-reading.patch
new file mode 100644
index 0000000000..5531d9ffc8
--- /dev/null
+++ b/patches/server/0924-Validate-ResourceLocation-in-NBT-reading.patch
@@ -0,0 +1,155 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Nassim Jahnke <[email protected]>
+Date: Thu, 4 Jan 2024 13:49:14 +0100
+Subject: [PATCH] Validate ResourceLocation in NBT reading
+
+
+diff --git a/src/main/java/net/minecraft/nbt/NbtUtils.java b/src/main/java/net/minecraft/nbt/NbtUtils.java
+index 4929bac8e476664086470f078efce6c0a6164413..f88dd37783b3c155c23b547c360b8d3c16e030c0 100644
+--- a/src/main/java/net/minecraft/nbt/NbtUtils.java
++++ b/src/main/java/net/minecraft/nbt/NbtUtils.java
+@@ -149,8 +149,10 @@ public final class NbtUtils {
+         if (!nbt.contains("Name", 8)) {
+             return Blocks.AIR.defaultBlockState();
+         } else {
+-            ResourceLocation resourceLocation = ResourceLocation.parse(nbt.getString("Name"));
+-            Optional<? extends Holder<Block>> optional = blockLookup.get(ResourceKey.create(Registries.BLOCK, resourceLocation));
++            // Paper start - Validate resource location
++            ResourceLocation resourceLocation = ResourceLocation.tryParse(nbt.getString("Name"));
++            Optional<? extends Holder<Block>> optional = resourceLocation != null ? blockLookup.get(ResourceKey.create(Registries.BLOCK, resourceLocation)) : Optional.empty();
++            // Paper end - Validate resource location
+             if (optional.isEmpty()) {
+                 return Blocks.AIR.defaultBlockState();
+             } else {
+diff --git a/src/main/java/net/minecraft/resources/ResourceLocation.java b/src/main/java/net/minecraft/resources/ResourceLocation.java
+index 87afe84791af2d5e9f869cd4c09eed4bb5fee75b..1967c43ee3a12e63365cc40ee6565307e2fd73cf 100644
+--- a/src/main/java/net/minecraft/resources/ResourceLocation.java
++++ b/src/main/java/net/minecraft/resources/ResourceLocation.java
+@@ -41,6 +41,13 @@ public final class ResourceLocation implements Comparable<ResourceLocation> {
+ 
+         assert isValidPath(path);
+ 
++        // Paper start - Validate ResourceLocation
++        // Check for the max network string length (capped at Short.MAX_VALUE) as well as the max bytes of a StringTag (length written as an unsigned short)
++        final String resourceLocation = namespace + ":" + path;
++        if (resourceLocation.length() > Short.MAX_VALUE || io.netty.buffer.ByteBufUtil.utf8MaxBytes(resourceLocation) > 2 * Short.MAX_VALUE + 1) {
++            throw new ResourceLocationException("Resource location too long: " + resourceLocation);
++        }
++        // Paper end - Validate ResourceLocation
+         this.namespace = namespace;
+         this.path = path;
+     }
+diff --git a/src/main/java/net/minecraft/world/RandomizableContainer.java b/src/main/java/net/minecraft/world/RandomizableContainer.java
+index 597cd5dbb4bb415a9b4d874c1c5dd621be1d6fc8..a9a80f8bc4a6f250fe3c20482c395058f024fabd 100644
+--- a/src/main/java/net/minecraft/world/RandomizableContainer.java
++++ b/src/main/java/net/minecraft/world/RandomizableContainer.java
+@@ -50,7 +50,7 @@ public interface RandomizableContainer extends Container {
+ 
+     default boolean tryLoadLootTable(CompoundTag nbt) {
+         if (nbt.contains("LootTable", 8)) {
+-            this.setLootTable(ResourceKey.create(Registries.LOOT_TABLE, ResourceLocation.parse(nbt.getString("LootTable"))));
++            this.setLootTable(net.minecraft.Optionull.map(ResourceLocation.tryParse(nbt.getString("LootTable")), rl -> ResourceKey.create(Registries.LOOT_TABLE, rl))); // Paper - Validate ResourceLocation
+             if (this.lootableData() != null && this.getLootTable() != null) this.lootableData().loadNbt(nbt); // Paper - LootTable API
+             if (nbt.contains("LootTableSeed", 4)) {
+                 this.setLootTableSeed(nbt.getLong("LootTableSeed"));
+diff --git a/src/main/java/net/minecraft/world/entity/EntityType.java b/src/main/java/net/minecraft/world/entity/EntityType.java
+index b98f9246b60daf31460f41ce214dfa7c011f5684..842b0cec0397d7ae5166617627340ffac0e35db1 100644
+--- a/src/main/java/net/minecraft/world/entity/EntityType.java
++++ b/src/main/java/net/minecraft/world/entity/EntityType.java
+@@ -623,7 +623,7 @@ public class EntityType<T extends Entity> implements FeatureElement, EntityTypeT
+     }
+ 
+     public static Optional<EntityType<?>> by(CompoundTag nbt) {
+-        return BuiltInRegistries.ENTITY_TYPE.getOptional(ResourceLocation.parse(nbt.getString("id")));
++        return BuiltInRegistries.ENTITY_TYPE.getOptional(ResourceLocation.tryParse(nbt.getString("id"))); // Paper - Validate ResourceLocation
+     }
+ 
+     @Nullable
+diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
+index ff16c7196b146388c526e3100e561be771ca8a91..cbf076c5fa69d32ad3c8ea759cd9d405b60f8663 100644
+--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
++++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
+@@ -887,11 +887,13 @@ public abstract class LivingEntity extends Entity implements Attackable {
+         if (nbt.contains("SleepingX", 99) && nbt.contains("SleepingY", 99) && nbt.contains("SleepingZ", 99)) {
+             BlockPos blockposition = new BlockPos(nbt.getInt("SleepingX"), nbt.getInt("SleepingY"), nbt.getInt("SleepingZ"));
+ 
++            if (this.position().distanceToSqr(blockposition.getX(), blockposition.getY(), blockposition.getZ()) < 16 * 16) { // Paper - The sleeping pos will always also set the actual pos, so a desync suggests something is wrong
+             this.setSleepingPos(blockposition);
+             this.entityData.set(LivingEntity.DATA_POSE, Pose.SLEEPING);
+             if (!this.firstTick) {
+                 this.setPosToBed(blockposition);
+             }
++            } // Paper - The sleeping pos will always also set the actual pos, so a desync suggests something is wrong
+         }
+ 
+         if (nbt.contains("Brain", 10)) {
+diff --git a/src/main/java/net/minecraft/world/entity/Mob.java b/src/main/java/net/minecraft/world/entity/Mob.java
+index 56873752ae1ae0d2a36cb171d2de6884e15c01a5..5bac748649f43d74b13e7c0b4d355e67654ad59e 100644
+--- a/src/main/java/net/minecraft/world/entity/Mob.java
++++ b/src/main/java/net/minecraft/world/entity/Mob.java
+@@ -605,7 +605,7 @@ public abstract class Mob extends LivingEntity implements EquipmentUser, Leashab
+         this.leashData = this.readLeashData(nbt);
+         this.setLeftHanded(nbt.getBoolean("LeftHanded"));
+         if (nbt.contains("DeathLootTable", 8)) {
+-            this.lootTable = ResourceKey.create(Registries.LOOT_TABLE, ResourceLocation.parse(nbt.getString("DeathLootTable")));
++            this.lootTable = net.minecraft.Optionull.map(ResourceLocation.tryParse(nbt.getString("DeathLootTable")), rl -> ResourceKey.create(Registries.LOOT_TABLE, rl)); // Paper - Validate ResourceLocation
+             this.lootTableSeed = nbt.getLong("DeathLootTableSeed");
+         }
+ 
+diff --git a/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java b/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
+index 10d30304c8c89b1f2a55be8529035311d1424e44..ddf47dab1ab92c45e3eea09239d418a9798ed59e 100644
+--- a/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
++++ b/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
+@@ -649,7 +649,7 @@ public abstract class AbstractArrow extends Projectile {
+         this.setCritArrow(nbt.getBoolean("crit"));
+         this.setPierceLevel(nbt.getByte("PierceLevel"));
+         if (nbt.contains("SoundEvent", 8)) {
+-            this.soundEvent = (SoundEvent) BuiltInRegistries.SOUND_EVENT.getOptional(ResourceLocation.parse(nbt.getString("SoundEvent"))).orElse(this.getDefaultHitGroundSoundEvent());
++            this.soundEvent = (SoundEvent) BuiltInRegistries.SOUND_EVENT.getOptional(ResourceLocation.tryParse(nbt.getString("SoundEvent"))).orElse(this.getDefaultHitGroundSoundEvent()); // Paper - Validate resource location
+         }
+ 
+         if (nbt.contains("item", 10)) {
+diff --git a/src/main/java/net/minecraft/world/entity/vehicle/ContainerEntity.java b/src/main/java/net/minecraft/world/entity/vehicle/ContainerEntity.java
+index ccc7367ab2740bea0f2b907223a0920b11665092..845eff7401b811c179dc9dee70eca0d724be5c80 100644
+--- a/src/main/java/net/minecraft/world/entity/vehicle/ContainerEntity.java
++++ b/src/main/java/net/minecraft/world/entity/vehicle/ContainerEntity.java
+@@ -73,7 +73,7 @@ public interface ContainerEntity extends Container, MenuProvider {
+     default void readChestVehicleSaveData(CompoundTag nbt, HolderLookup.Provider registriesLookup) {
+         this.clearItemStacks();
+         if (nbt.contains("LootTable", 8)) {
+-            this.setLootTable(ResourceKey.create(Registries.LOOT_TABLE, ResourceLocation.parse(nbt.getString("LootTable"))));
++            this.setLootTable(net.minecraft.Optionull.map(ResourceLocation.tryParse(nbt.getString("LootTable")), rl -> ResourceKey.create(Registries.LOOT_TABLE, rl))); // Paper - Validate ResourceLocation
+             // Paper start - LootTable API
+             if (this.getLootTable() != null) {
+                 this.lootableData().loadNbt(nbt);
+diff --git a/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java
+index 65ab9b22f724877b68f4f25aad2831e2cb080b19..730aca233f6e7564d4cb85b5b628d23c4f01d2f4 100644
+--- a/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java
++++ b/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java
+@@ -295,7 +295,12 @@ public abstract class AbstractFurnaceBlockEntity extends BaseContainerBlockEntit
+         while (iterator.hasNext()) {
+             String s = (String) iterator.next();
+ 
+-            this.recipesUsed.put(ResourceLocation.parse(s), nbttagcompound1.getInt(s));
++            // Paper start - Validate ResourceLocation
++            final ResourceLocation resourceLocation = ResourceLocation.tryParse(s);
++            if (resourceLocation != null) {
++            this.recipesUsed.put(resourceLocation, nbttagcompound1.getInt(s));
++            }
++            // Paper end - Validate ResourceLocation
+         }
+ 
+         // Paper start - cook speed multiplier API
+diff --git a/src/main/java/net/minecraft/world/level/block/entity/BrushableBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BrushableBlockEntity.java
+index 32de29c385c784ab87e29b2e072f3992386cd775..dc02a3d84b397f634f77f4df9c06e245cc4dcb75 100644
+--- a/src/main/java/net/minecraft/world/level/block/entity/BrushableBlockEntity.java
++++ b/src/main/java/net/minecraft/world/level/block/entity/BrushableBlockEntity.java
+@@ -202,7 +202,7 @@ public class BrushableBlockEntity extends BlockEntity {
+ 
+     private boolean tryLoadLootTable(CompoundTag nbt) {
+         if (nbt.contains("LootTable", 8)) {
+-            this.lootTable = ResourceKey.create(Registries.LOOT_TABLE, ResourceLocation.parse(nbt.getString("LootTable")));
++            this.lootTable = net.minecraft.Optionull.map(ResourceLocation.tryParse(nbt.getString("LootTable")), rl -> ResourceKey.create(Registries.LOOT_TABLE, rl)); // Paper - Validate ResourceLocation
+             this.lootTableSeed = nbt.getLong("LootTableSeed");
+             return true;
+         } else {