PaperMC/CraftBukkit-Patches/0113-Better-item-validation.patch

From 77058805fac70e9b35debdba1a12f5a05f1f9510 Mon Sep 17 00:00:00 2001
From: Thinkofdeath <thinkofdeath@spigotmc.org>
Date: Wed, 2 Jul 2014 23:35:51 +0100
Subject: [PATCH] Better item validation


diff --git a/src/main/java/net/minecraft/server/PacketDataSerializer.java b/src/main/java/net/minecraft/server/PacketDataSerializer.java
index 9655e74..ede4fe2 100644
--- a/src/main/java/net/minecraft/server/PacketDataSerializer.java
+++ b/src/main/java/net/minecraft/server/PacketDataSerializer.java
@@ -213,6 +213,10 @@ public class PacketDataSerializer extends ByteBuf {
             NBTTagCompound nbttagcompound = null;
 
             if (itemstack.getItem().usesDurability() || itemstack.getItem().p()) {
+                // Spigot start - filter
+                itemstack = itemstack.cloneItemStack();
+                CraftItemStack.setItemMeta(itemstack, CraftItemStack.getItemMeta(itemstack));
+                // Spigot end
                 nbttagcompound = itemstack.getTag();
             }
 
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBook.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBook.java
index 0318958..0b5ada0 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBook.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBook.java
@@ -22,6 +22,10 @@ import net.minecraft.server.IChatBaseComponent;
 import net.minecraft.server.NBTTagString;
 import org.bukkit.craftbukkit.util.CraftChatMessage;
 
+// Spigot start
+import static org.spigotmc.ValidateUtils.*;
+// Spigot end
+
 @DelegateDeserialization(SerializableMeta.class)
 public class CraftMetaBook extends CraftMetaItem implements BookMeta {
     static final ItemMetaKey BOOK_TITLE = new ItemMetaKey("title");
@@ -57,11 +61,11 @@ public class CraftMetaBook extends CraftMetaItem implements BookMeta {
         super(tag);
 
         if (tag.hasKey(BOOK_TITLE.NBT)) {
-            this.title = tag.getString(BOOK_TITLE.NBT);
+            this.title = limit( tag.getString(BOOK_TITLE.NBT), 1024 ); // Spigot
         }
 
         if (tag.hasKey(BOOK_AUTHOR.NBT)) {
-            this.author = tag.getString(BOOK_AUTHOR.NBT);
+            this.author = limit( tag.getString(BOOK_AUTHOR.NBT), 1024 ); // Spigot
         }
 
         boolean resolved = false;
@@ -86,7 +90,7 @@ public class CraftMetaBook extends CraftMetaItem implements BookMeta {
                         // Ignore and treat as an old book
                     }
                 }
-                addPage(page);
+                addPage( limit( page, 2048 ) ); // Spigot
             }
         }
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
index e487d52..07ea6f6 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
@@ -47,6 +47,10 @@ import java.util.logging.Logger;
 import net.minecraft.server.NBTCompressedStreamTools;
 import org.apache.commons.codec.binary.Base64;
 
+// Spigot start
+import static org.spigotmc.ValidateUtils.*;
+// Spigot end
+
 /**
  * Children must include the following:
  *
@@ -247,7 +251,7 @@ class CraftMetaItem implements ItemMeta, Repairable {
             NBTTagCompound display = tag.getCompound(DISPLAY.NBT);
 
             if (display.hasKey(NAME.NBT)) {
-                displayName = display.getString(NAME.NBT);
+                displayName = limit( display.getString(NAME.NBT), 1024 ); // Spigot
             }
 
             if (display.hasKey(LORE.NBT)) {
@@ -255,7 +259,7 @@ class CraftMetaItem implements ItemMeta, Repairable {
                 lore = new ArrayList<String>(list.size());
 
                 for (int index = 0; index < list.size(); index++) {
-                    String line = list.getString(index);
+                    String line = limit( list.getString(index), 1024 ); // Spigot
                     lore.add(line);
                 }
             }
diff --git a/src/main/java/org/spigotmc/ValidateUtils.java b/src/main/java/org/spigotmc/ValidateUtils.java
new file mode 100644
index 0000000..58a9534
--- /dev/null
+++ b/src/main/java/org/spigotmc/ValidateUtils.java
@@ -0,0 +1,14 @@
+package org.spigotmc;
+
+public class ValidateUtils
+{
+
+    public static String limit(String str, int limit)
+    {
+        if ( str.length() > limit )
+        {
+            return str.substring( 0, limit );
+        }
+        return str;
+    }
+}
-- 
2.5.0