From cbe35161f2e8a59c22aca9a0d5412674d128df41 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 21 Mar 2018 19:57:10 -0400
Subject: [PATCH] Configurable Unrestricted Signs

Bukkit restricts command execution of signs to test if the sender
has permission to run the specified command. This breaks vanilla
maps that use signs to intentionally run as elevated permission.

Bukkit provides an unrestricted advancements setting, so this setting
compliments that one and allows for unrestricted signs.

We still filter sign update packets to strip out commands at edit phase,
however there is no sanity in ever expecting creative mode to not be
able to create signs with any command.

Creative servers should absolutely never enable this.
Non creative servers, enable at own risk!!!

diff --git a/src/main/java/net/minecraft/server/TileEntitySign.java b/src/main/java/net/minecraft/server/TileEntitySign.java
index 3f2c5b2d5..67bd3bcbe 100644
--- a/src/main/java/net/minecraft/server/TileEntitySign.java
+++ b/src/main/java/net/minecraft/server/TileEntitySign.java
@@ -38,7 +38,7 @@ public class TileEntitySign extends TileEntity {
     public void load(NBTTagCompound nbttagcompound) {
         this.isEditable = false;
         super.load(nbttagcompound);
-        ICommandListener icommandlistener = new ICommandListener() {
+        ICommandListener icommandlistener = new ISignCommandListener() { // Paper
             public String getName() {
                 return "Sign";
             }
@@ -125,7 +125,7 @@ public class TileEntitySign extends TileEntity {
     }
 
     public boolean b(final EntityHuman entityhuman) {
-        ICommandListener icommandlistener = new ICommandListener() {
+        ICommandListener icommandlistener = new ISignCommandListener() { // Paper
             public String getName() {
                 return entityhuman.getName();
             }
@@ -200,4 +200,5 @@ public class TileEntitySign extends TileEntity {
     public CommandObjectiveExecutor f() {
         return this.i;
     }
+    public interface ISignCommandListener extends ICommandListener {} // Paper
 }
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index e86c16755..6095948e8 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -175,6 +175,7 @@ public final class CraftServer implements Server {
     private CraftIconCache icon;
     private boolean overrideAllCommandBlockCommands = false;
     private boolean unrestrictedAdvancements;
+    private boolean unrestrictedSignCommands; // Paper
     private final List<CraftPlayer> playerView;
     public int reloadCount;
     public static Exception excessiveVelEx; // Paper - Velocity warnings
@@ -253,6 +254,12 @@ public final class CraftServer implements Server {
         saveCommandsConfig();
         overrideAllCommandBlockCommands = commandsConfiguration.getStringList("command-block-overrides").contains("*");
         unrestrictedAdvancements = commandsConfiguration.getBoolean("unrestricted-advancements");
+        // Paper start
+        unrestrictedSignCommands = commandsConfiguration.getBoolean("unrestricted-signs");
+        if (unrestrictedSignCommands) {
+            logger.warning("Warning: Commands are no longer restricted on signs. If you allow players to use Creative Mode, there may be risk of players bypassing permissions. Use this setting at your own risk!!!!");
+        }
+        // Paper end
         pluginManager.useTimings(configuration.getBoolean("settings.plugin-profiling"));
         monsterSpawn = configuration.getInt("spawn-limits.monsters");
         animalSpawn = configuration.getInt("spawn-limits.animals");
@@ -270,6 +277,7 @@ public final class CraftServer implements Server {
             listener = ((CommandListenerWrapper) listener).base;
         }
 
+        if (unrestrictedSignCommands && listener instanceof TileEntitySign.ISignCommandListener) return true; // Paper
         return unrestrictedAdvancements && listener instanceof AdvancementRewards.AdvancementCommandListener;
     }
 
-- 
2.18.0