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a73ed9572e
Upstream has released updates that appear to apply and compile correctly. This update has not been tested by PaperMC and as with ANY update, please do your own testing CraftBukkit Changes: b76ceb4f5 PR-1235: Move EntityType return to base Entity class e795d7490 SPIGOT-7458: Exception when Entity CommandSender executes Vanilla command 46c7fc3b1 SPIGOT-7452: Player#openSign cannot edit d91e5aa0b SPIGOT-7447: Rewrite --forceUpgrade to minimise diff and properly handle CraftBukkit world layout 921ae06d6 Revert "SPIGOT-7447: Fix --forceUpgrade" Spigot Changes: 94e187b5 Rebuild patches 3bce7935 SPIGOT-7091: Update bungeecord-chat
79 lines
4.1 KiB
Diff
79 lines
4.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: egg82 <eggys82@gmail.com>
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Date: Sat, 11 Sep 2021 22:55:14 +0200
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Subject: [PATCH] Add root/admin user detection
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This patch detects whether or not the server is currently executing as a privileged user and spits out a warning.
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The warning serves as a sort-of PSA for newer server admins who don't understand the risks of running as root.
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We've seen plenty of bad/malicious plugins hit markets, and there's been a few close-calls with exploits in the past.
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Hopefully this helps mitigate some potential damage to servers, even if it is just a warning.
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Co-authored-by: Noah van der Aa <ndvdaa@gmail.com>
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diff --git a/src/main/java/io/papermc/paper/util/ServerEnvironment.java b/src/main/java/io/papermc/paper/util/ServerEnvironment.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..6bd0afddbcc461149dfe9a5c7a86fff6ea13a5f1
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--- /dev/null
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+++ b/src/main/java/io/papermc/paper/util/ServerEnvironment.java
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@@ -0,0 +1,40 @@
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+package io.papermc.paper.util;
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+
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+import com.sun.security.auth.module.NTSystem;
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+import com.sun.security.auth.module.UnixSystem;
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+import org.apache.commons.lang.SystemUtils;
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+
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+import java.io.IOException;
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+import java.io.InputStream;
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+import java.util.Set;
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+
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+public class ServerEnvironment {
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+ private static final boolean RUNNING_AS_ROOT_OR_ADMIN;
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+ private static final String WINDOWS_HIGH_INTEGRITY_LEVEL = "S-1-16-12288";
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+
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+ static {
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+ if (SystemUtils.IS_OS_WINDOWS) {
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+ RUNNING_AS_ROOT_OR_ADMIN = Set.of(new NTSystem().getGroupIDs()).contains(WINDOWS_HIGH_INTEGRITY_LEVEL);
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+ } else {
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+ boolean isRunningAsRoot = false;
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+ if (new UnixSystem().getUid() == 0) {
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+ // Due to an OpenJDK bug (https://bugs.openjdk.java.net/browse/JDK-8274721), UnixSystem#getUid incorrectly
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+ // returns 0 when the user doesn't have a username. Because of this, we'll have to double-check if the user ID is
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+ // actually 0 by running the id -u command.
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+ try {
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+ Process process = new ProcessBuilder("id", "-u").start();
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+ process.waitFor();
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+ InputStream inputStream = process.getInputStream();
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+ isRunningAsRoot = new String(inputStream.readAllBytes()).trim().equals("0");
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+ } catch (InterruptedException | IOException ignored) {
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+ isRunningAsRoot = false;
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+ }
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+ }
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+ RUNNING_AS_ROOT_OR_ADMIN = isRunningAsRoot;
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+ }
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+ }
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+
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+ public static boolean userIsRootOrAdmin() {
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+ return RUNNING_AS_ROOT_OR_ADMIN;
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+ }
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+}
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diff --git a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
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index 1fbe7a58707ddd40f80d71e3703ff3fefff672f4..9a45921cbb1e7a39e6ef46cc93c14766ee8229ad 100644
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--- a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
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+++ b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
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@@ -179,6 +179,16 @@ public class DedicatedServer extends MinecraftServer implements ServerInterface
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DedicatedServer.LOGGER.warn("To start the server with more ram, launch it as \"java -Xmx1024M -Xms1024M -jar minecraft_server.jar\"");
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}
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+ // Paper start - detect running as root
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+ if (io.papermc.paper.util.ServerEnvironment.userIsRootOrAdmin()) {
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+ DedicatedServer.LOGGER.warn("****************************");
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+ DedicatedServer.LOGGER.warn("YOU ARE RUNNING THIS SERVER AS AN ADMINISTRATIVE OR ROOT USER. THIS IS NOT ADVISED.");
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+ DedicatedServer.LOGGER.warn("YOU ARE OPENING YOURSELF UP TO POTENTIAL RISKS WHEN DOING THIS.");
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+ DedicatedServer.LOGGER.warn("FOR MORE INFORMATION, SEE https://madelinemiller.dev/blog/root-minecraft-server/");
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+ DedicatedServer.LOGGER.warn("****************************");
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+ }
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+ // Paper end
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+
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DedicatedServer.LOGGER.info("Loading properties");
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DedicatedServerProperties dedicatedserverproperties = this.settings.getProperties();
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