Paper/patches/server/0741-Validate-usernames.patch
2023-12-06 11:00:26 -05:00

71 Zeilen
3.8 KiB
Diff

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 0c4fb4a7d4fcdc6d724beb13a16bd729a3c525cd..20ba13c06edf125ba216d1ca8794868abcd8f916 100644
--- a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
@@ -63,6 +63,7 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
public GameProfile authenticatedProfile; // Paper - public
private final String serverId;
private ServerPlayer player; // CraftBukkit
+ public boolean iKnowThisMayNotBeTheBestIdeaButPleaseDisableUsernameValidation = false; // Paper - username validation overriding
public ServerLoginPacketListenerImpl(MinecraftServer server, Connection connection) {
this.state = ServerLoginPacketListenerImpl.State.HELLO;
@@ -134,10 +135,38 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
return this.requestedUsername != null ? this.requestedUsername + " (" + s + ")" : s;
}
+ // Paper start - validate usernames
+ public static boolean validateUsername(String in) {
+ if (in == null || in.isEmpty() || in.length() > 16) {
+ return false;
+ }
+
+ for (int i = 0, len = in.length(); i < len; ++i) {
+ char c = in.charAt(i);
+
+ if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || (c == '_' || c == '.')) {
+ continue;
+ }
+
+ return false;
+ }
+
+ return true;
+ }
+ // Paper end - validate usernames
+
@Override
public void handleHello(ServerboundHelloPacket packet) {
Validate.validState(this.state == ServerLoginPacketListenerImpl.State.HELLO, "Unexpected hello packet", new Object[0]);
Validate.validState(Player.isValidUsername(packet.name()), "Invalid characters in username", new Object[0]);
+ // Paper start - validate usernames -- TODO: Do we need this?
+ if (io.papermc.paper.configuration.GlobalConfiguration.get().proxies.isProxyOnlineMode() && io.papermc.paper.configuration.GlobalConfiguration.get().unsupportedSettings.performUsernameValidation) {
+ if (!this.iKnowThisMayNotBeTheBestIdeaButPleaseDisableUsernameValidation && !validateUsername(packet.name())) {
+ ServerLoginPacketListenerImpl.this.disconnect("Failed to verify username!");
+ return;
+ }
+ }
+ // 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 c92545e3cd199c7e123f65d42ca8976d2da27509..1e15c3576b6b506335c66a4ca0a47f3aa178c72a 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -679,7 +679,7 @@ 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);
}
}