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555ca59af7
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.
87 lines
3.7 KiB
Diff
87 lines
3.7 KiB
Diff
From 2f25bc9579085e0c3d522e972c79c6e4ae15a2de Mon Sep 17 00:00:00 2001
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From: egg82 <eggys82@gmail.com>
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Date: Thu, 8 Aug 2019 14:12:48 -0600
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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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diff --git a/src/main/java/com/destroystokyo/paper/util/ServerEnvironment.java b/src/main/java/com/destroystokyo/paper/util/ServerEnvironment.java
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new file mode 100644
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index 000000000..76bfae177
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--- /dev/null
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+++ b/src/main/java/com/destroystokyo/paper/util/ServerEnvironment.java
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@@ -0,0 +1,38 @@
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+package com.destroystokyo.paper.util;
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+
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+import java.io.OutputStream;
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+import java.io.PrintStream;
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+import java.util.prefs.Preferences;
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+
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+public class ServerEnvironment {
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+ private static final boolean runningAsRootOrAdmin;
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+
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+ static {
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+ // https://stackoverflow.com/a/23538961
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+ Preferences prefs = Preferences.systemRoot();
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+ PrintStream err = System.err;
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+ PrintStream emptyStream = new PrintStream(new OutputStream() {
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+ @Override
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+ public void write(int b) { }
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+ });
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+
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+ System.err.flush();
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+ System.setErr(emptyStream);
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+
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+ boolean retVal;
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+ try {
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+ prefs.put("papermc.priv_test", "This is a test performed by the Paper Minecraft server software."); // SecurityException
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+ prefs.remove("papermc.priv_test");
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+ prefs.flush(); // BackingStoreException
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+ retVal = true;
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+ } catch (Exception ignored) { // Windows = SecurityException, Linux = BackingStoreException
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+ retVal = false;
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+ }
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+ runningAsRootOrAdmin = retVal;
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+
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+ System.err.flush();
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+ System.setErr(err);
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+ }
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+
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+ public static boolean userIsRootOrAdmin() { return runningAsRootOrAdmin; }
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+}
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diff --git a/src/main/java/org/bukkit/craftbukkit/Main.java b/src/main/java/org/bukkit/craftbukkit/Main.java
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index af05f3c1e..2a0273074 100644
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--- a/src/main/java/org/bukkit/craftbukkit/Main.java
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+++ b/src/main/java/org/bukkit/craftbukkit/Main.java
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@@ -1,5 +1,6 @@
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package org.bukkit.craftbukkit;
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+import com.destroystokyo.paper.util.ServerEnvironment; // Paper
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import java.io.File;
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import java.io.IOException;
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import java.text.SimpleDateFormat;
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@@ -212,6 +213,17 @@ public class Main {
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System.setProperty(TerminalConsoleAppender.JLINE_OVERRIDE_PROPERTY, "false"); // Paper
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}
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+ // Paper start - detect running as root
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+ if (ServerEnvironment.userIsRootOrAdmin()) {
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+ System.err.println("****************************");
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+ System.err.println("YOU ARE RUNNING AS AN ADMINISTRATIVE OR ROOT USER. THIS IS NOT ADVISED.");
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+ System.err.println("YOU ARE OPENING YOURSELF UP TO POTENTIAL RISKS WHEN DOING THIS.");
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+ System.err.println("MALWARE, BAD PLUGINS, AND ATTACKERS WILL HAVE COMPLETE ACCESS AND CONTROL OF YOUR MACHINE.");
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+ System.err.println("****************************");
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+ System.err.println();
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+ }
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+ // Paper end
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+
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if (Main.class.getPackage().getImplementationVendor() != null && System.getProperty("IReallyKnowWhatIAmDoingISwear") == null) {
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Date buildDate = new SimpleDateFormat("yyyyMMdd-HHmm").parse(Main.class.getPackage().getImplementationVendor());
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--
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2.25.0
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