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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sat, 1 Jan 2022 05:19:37 -0800
Subject: [PATCH] Validate usernames
diff --git a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
index 1e4b288f20153ce0c91fabf164c5c8320c90ba7d..cb5dd77892283a1aaec45434fb99bb7f08ee5394 100644
--- a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
@@ -90,6 +90,7 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
private final String serverId;
private final boolean transferred;
private ServerPlayer player; // CraftBukkit
+ public boolean iKnowThisMayNotBeTheBestIdeaButPleaseDisableUsernameValidation = false; // Paper - username validation overriding
public ServerLoginPacketListenerImpl(MinecraftServer server, Connection connection, boolean transferred) {
this.state = ServerLoginPacketListenerImpl.State.HELLO;
@@ -171,7 +172,13 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
@Override
public void handleHello(ServerboundHelloPacket packet) {
Validate.validState(this.state == ServerLoginPacketListenerImpl.State.HELLO, "Unexpected hello packet", new Object[0]);
- Validate.validState(StringUtil.isValidPlayerName(packet.name()), "Invalid characters in username", new Object[0]);
+ // Paper start - Validate usernames
+ if (io.papermc.paper.configuration.GlobalConfiguration.get().proxies.isProxyOnlineMode()
+ && io.papermc.paper.configuration.GlobalConfiguration.get().unsupportedSettings.performUsernameValidation
+ && !this.iKnowThisMayNotBeTheBestIdeaButPleaseDisableUsernameValidation) {
+ Validate.validState(StringUtil.isReasonablePlayerName(packet.name()), "Invalid characters in username", new Object[0]);
+ }
+ // Paper end - Validate usernames
this.requestedUsername = packet.name();
GameProfile gameprofile = this.server.getSingleplayerProfile();
diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
index 05d2f3c26d10169f6cf43bcb6c48db5d27b5cbac..3a0e0196f5bfa554b23fff9ff1a18a189b36452e 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -627,7 +627,7 @@ public abstract class PlayerList {
for (int i = 0; i < this.players.size(); ++i) {
entityplayer = (ServerPlayer) this.players.get(i);
- if (entityplayer.getUUID().equals(uuid)) {
+ if (entityplayer.getUUID().equals(uuid) || (io.papermc.paper.configuration.GlobalConfiguration.get().proxies.isProxyOnlineMode() && entityplayer.getGameProfile().getName().equalsIgnoreCase(gameprofile.getName()))) { // Paper - validate usernames
list.add(entityplayer);
}
}
diff --git a/src/main/java/net/minecraft/util/StringUtil.java b/src/main/java/net/minecraft/util/StringUtil.java
index e588bd7ef0616dc88ce4c0feeeabadc29dcaa550..6c33002dc8bbb3759c3156302ab7d1f26ce5e8ee 100644
--- a/src/main/java/net/minecraft/util/StringUtil.java
+++ b/src/main/java/net/minecraft/util/StringUtil.java
@@ -67,6 +67,25 @@ public class StringUtil {
return name.length() <= 16 && name.chars().filter(c -> c <= 32 || c >= 127).findAny().isEmpty();
}
+ // Paper start - Username validation
+ public static boolean isReasonablePlayerName(final String name) {
+ if (name.isEmpty() || name.length() > 16) {
+ return false;
+ }
+
+ for (int i = 0, len = name.length(); i < len; ++i) {
+ final char c = name.charAt(i);
+ if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || (c == '_' || c == '.')) {
+ continue;
+ }
+
+ return false;
+ }
+
+ return true;
+ }
+ // Paper end - Username validation
+
public static String filterText(String string) {
return filterText(string, false);
}
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