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Add root/admin user detection

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Noah van der Aa 2021-09-30 18:24:12 +02:00
parent f92cc98839
commit dfe8240ec6
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BungeeCord-Patches/0062-Add-root-admin-user-detection.patch Normal file
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From 5fb36dc51158d5d396411ac9bcf66ab7af62cfdb Mon Sep 17 00:00:00 2001
From: Noah van der Aa <ndvdaa@gmail.com>
Date: Thu, 30 Sep 2021 16:59:18 +0200
Subject: [PATCH] Add root/admin user detection
This patch detects whether or not the server is currently executing as a privileged user and spits out a warning.
The warning serves as a sort-of PSA for newer server admins who don't understand the risks of running as root.
We've seen plenty of bad/malicious plugins hit markets, and there's been a few close-calls with exploits in the past.
Hopefully this helps mitigate some potential damage to servers, even if it is just a warning.
Co-authored-by: egg82 <eggys82@gmail.com>
diff --git a/api/src/main/java/io/github/waterfallmc/waterfall/utils/ServerEnvironment.java b/api/src/main/java/io/github/waterfallmc/waterfall/utils/ServerEnvironment.java
new file mode 100644
index 00000000..99bd16b9
--- /dev/null
+++ b/api/src/main/java/io/github/waterfallmc/waterfall/utils/ServerEnvironment.java
@@ -0,0 +1,32 @@
+package io.github.waterfallmc.waterfall.utils;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class ServerEnvironment {
+ private static final boolean RUNNING_AS_ROOT_OR_ADMIN;
+
+ static {
+ boolean isWindows = System.getProperty("os.name").startsWith("Windows");
+ boolean isAdmin = false;
+ try {
+ Process process = Runtime.getRuntime().exec(isWindows ? "reg query \"HKU\\S-1-5-19\"" : "id -u " + System.getProperty("user.name"));
+ process.waitFor();
+ if (isWindows) {
+ isAdmin = process.exitValue() == 0;
+ } else {
+ BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
+ String uid = reader.readLine();
+ isAdmin = uid.equals("0");
+ }
+ } catch (InterruptedException | IOException ignored) {
+ ignored.printStackTrace();
+ }
+ RUNNING_AS_ROOT_OR_ADMIN = isAdmin;
+ }
+
+ public static boolean userIsRootOrAdmin() {
+ return RUNNING_AS_ROOT_OR_ADMIN;
+ }
+}
\ No newline at end of file
diff --git a/proxy/src/main/java/net/md_5/bungee/BungeeCord.java b/proxy/src/main/java/net/md_5/bungee/BungeeCord.java
index 07d74c67..d66c5a6c 100644
--- a/proxy/src/main/java/net/md_5/bungee/BungeeCord.java
+++ b/proxy/src/main/java/net/md_5/bungee/BungeeCord.java
@@ -287,6 +287,16 @@ public class BungeeCord extends ProxyServer
isRunning = true;
+ // Waterfall start - detect running as root
+ if ( io.github.waterfallmc.waterfall.utils.ServerEnvironment.userIsRootOrAdmin() ) {
+ getLogger().warning("****************************");
+ getLogger().warning("YOU ARE RUNNING THIS SERVER AS AN ADMINISTRATIVE OR ROOT USER. THIS IS NOT ADVISED.");
+ getLogger().warning("YOU ARE OPENING YOURSELF UP TO POTENTIAL RISKS WHEN DOING THIS.");
+ getLogger().warning("FOR MORE INFORMATION, SEE https://madelinemiller.dev/blog/root-minecraft-server/");
+ getLogger().warning("****************************");
+ }
+ // Waterfall end
+
pluginManager.enablePlugins();
if ( config.getThrottle() > 0 )
--
2.33.0