Paper/CraftBukkit-Patches/0039-Prevent-handshake-spam-from-invalid-names.patch

61 lines
2.4 KiB
Diff

From c1dcecdd3cca81c750580a70b1125012481fca7c Mon Sep 17 00:00:00 2001
From: Benjamin James Harrison-Sims <tehrainbowguy@gmail.com>
Date: Sun, 14 Apr 2013 21:19:57 +0500
Subject: [PATCH] Prevent handshake spam from invalid names.
diff --git a/src/main/java/net/minecraft/server/Packet2Handshake.java b/src/main/java/net/minecraft/server/Packet2Handshake.java
index 343af93..aa6609b 100644
--- a/src/main/java/net/minecraft/server/Packet2Handshake.java
+++ b/src/main/java/net/minecraft/server/Packet2Handshake.java
@@ -1,5 +1,7 @@
package net.minecraft.server;
+import org.bukkit.craftbukkit.Spigot;
+
import java.io.DataInputStream;
import java.io.DataOutputStream;
@@ -19,6 +21,7 @@ public class Packet2Handshake extends Packet {
this.b = a(datainputstream, 16);
this.c = a(datainputstream, 255);
this.d = datainputstream.readInt();
+ if(!Spigot.validName.matcher(this.b).matches()) throw new IOException("Invalid name!"); // Spigot
}
public void a(DataOutputStream dataoutputstream) throws IOException { // CraftBukkit - throws IOException
diff --git a/src/main/java/org/bukkit/craftbukkit/Spigot.java b/src/main/java/org/bukkit/craftbukkit/Spigot.java
index 99020e7..c7ef0e1 100644
--- a/src/main/java/org/bukkit/craftbukkit/Spigot.java
+++ b/src/main/java/org/bukkit/craftbukkit/Spigot.java
@@ -6,6 +6,7 @@ import java.net.InetAddress;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
+import java.util.regex.Pattern;
import net.minecraft.server.AxisAlignedBB;
import net.minecraft.server.Chunk;
import net.minecraft.server.Entity;
@@ -57,6 +58,7 @@ public class Spigot {
private static Metrics metrics;
public static List<String> bungeeIPs;
public static int textureResolution = 16;
+ public static final Pattern validName = Pattern.compile("^[a-zA-Z0-9_-]{2,16}$");
public static void initialize(CraftServer server, SimpleCommandMap commandMap, YamlConfiguration configuration) {
commandMap.register("bukkit", new org.bukkit.craftbukkit.command.TicksPerSecondCommand("tps"));
@@ -384,7 +386,9 @@ public class Spigot {
}
/**
- * Gets the range an entity should be 'tracked' by players and visible in the client.
+ * Gets the range an entity should be 'tracked' by players and visible in
+ * the client.
+ *
* @param entity
* @param defaultRange Default range defined by Mojang
* @return
--
1.8.1.2