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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.
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: Noah van der Aa <ndvdaa@gmail.com>
This commit is contained in:
egg82 2021-09-11 22:55:14 +02:00
parent 987d596834
commit 61353ac496
2 changed files with 52 additions and 14 deletions
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43
paper-server/patches/sources/net/minecraft/server/dedicated/DedicatedServer.java.patch
View file

@ -35,7 +35,7 @@
@Nullable
private RconThread rconThread;
public DedicatedServerSettings settings;
@@ -81,36 +92,102 @@
@@ -81,41 +92,117 @@
private DebugSampleSubscriptionTracker debugSampleSubscriptionTracker;
public ServerLinks serverLinks;
@ -148,7 +148,22 @@
DedicatedServer.LOGGER.info("Starting minecraft server version {}", SharedConstants.getCurrentVersion().getName());
if (Runtime.getRuntime().maxMemory() / 1024L / 1024L < 512L) {
DedicatedServer.LOGGER.warn("To start the server with more ram, launch it as \"java -Xmx1024M -Xms1024M -jar minecraft_server.jar\"");
@@ -126,14 +203,50 @@
}
+ // Paper start - detect running as root
+ if (io.papermc.paper.util.ServerEnvironment.userIsRootOrAdmin()) {
+ DedicatedServer.LOGGER.warn("****************************");
+ DedicatedServer.LOGGER.warn("YOU ARE RUNNING THIS SERVER AS AN ADMINISTRATIVE OR ROOT USER. THIS IS NOT ADVISED.");
+ DedicatedServer.LOGGER.warn("YOU ARE OPENING YOURSELF UP TO POTENTIAL RISKS WHEN DOING THIS.");
+ DedicatedServer.LOGGER.warn("FOR MORE INFORMATION, SEE https://madelinemiller.dev/blog/root-minecraft-server/");
+ DedicatedServer.LOGGER.warn("****************************");
+ }
+ // Paper end - detect running as root
+
DedicatedServer.LOGGER.info("Loading properties");
DedicatedServerProperties dedicatedserverproperties = this.settings.getProperties();
@@ -126,14 +213,50 @@
this.setPreventProxyConnections(dedicatedserverproperties.preventProxyConnections);
this.setLocalIp(dedicatedserverproperties.serverIp);
}
@ -200,7 +215,7 @@
InetAddress inetaddress = null;
if (!this.getLocalIp().isEmpty()) {
@@ -143,12 +256,15 @@
@@ -143,12 +266,15 @@
if (this.getPort() < 0) {
this.setPort(dedicatedserverproperties.serverPort);
}
@ -217,7 +232,7 @@
} catch (IOException ioexception) {
DedicatedServer.LOGGER.warn("**** FAILED TO BIND TO PORT!");
DedicatedServer.LOGGER.warn("The exception was: {}", ioexception.toString());
@@ -156,21 +272,31 @@
@@ -156,21 +282,31 @@
return false;
}
@ -254,7 +269,7 @@
this.debugSampleSubscriptionTracker = new DebugSampleSubscriptionTracker(this.getPlayerList());
this.tickTimeLogger = new RemoteSampleLogger(TpsDebugDimensions.values().length, this.debugSampleSubscriptionTracker, RemoteDebugSampleType.TICK_TIME);
long i = Util.getNanos();
@@ -178,13 +304,13 @@
@@ -178,13 +314,13 @@
SkullBlockEntity.setup(this.services, this);
GameProfileCache.setUsesAuthentication(this.usesAuthentication());
DedicatedServer.LOGGER.info("Preparing level \"{}\"", this.getLevelIdName());
@ -270,7 +285,7 @@
}
if (dedicatedserverproperties.enableQuery) {
@@ -197,7 +323,7 @@
@@ -197,7 +333,7 @@
this.rconThread = RconThread.create(this);
}
@ -279,7 +294,7 @@
Thread thread1 = new Thread(new ServerWatchdog(this));
thread1.setUncaughtExceptionHandler(new DefaultUncaughtExceptionHandlerWithName(DedicatedServer.LOGGER));
@@ -215,6 +341,12 @@
@@ -215,6 +351,12 @@
}
}
@ -292,7 +307,7 @@
@Override
public boolean isSpawningMonsters() {
return this.settings.getProperties().spawnMonsters && super.isSpawningMonsters();
@@ -227,7 +359,7 @@
@@ -227,7 +369,7 @@
@Override
public void forceDifficulty() {
@ -301,7 +316,7 @@
}
@Override
@@ -286,13 +418,14 @@
@@ -286,13 +428,14 @@
}
if (this.rconThread != null) {
@ -318,7 +333,7 @@
}
@Override
@@ -302,19 +435,29 @@
@@ -302,19 +445,29 @@
}
@Override
@ -354,7 +369,7 @@
}
}
@@ -383,7 +526,7 @@
@@ -383,7 +536,7 @@
@Override
public boolean isUnderSpawnProtection(ServerLevel world, BlockPos pos, Player player) {
@ -363,7 +378,7 @@
return false;
} else if (this.getPlayerList().getOps().isEmpty()) {
return false;
@@ -453,7 +596,11 @@
@@ -453,7 +606,11 @@
public boolean enforceSecureProfile() {
DedicatedServerProperties dedicatedserverproperties = this.getProperties();
@ -376,7 +391,7 @@
}
@Override
@@ -541,16 +688,52 @@
@@ -541,16 +698,52 @@
@Override
public String getPluginNames() {
@ -433,7 +448,7 @@
}
public void storeUsingWhiteList(boolean useWhitelist) {
@@ -660,4 +843,15 @@
@@ -660,4 +853,15 @@
}
}
}

23
paper-server/src/main/java/io/papermc/paper/util/ServerEnvironment.java Normal file
View file

@ -0,0 +1,23 @@
package io.papermc.paper.util;
import com.sun.security.auth.module.NTSystem;
import com.sun.security.auth.module.UnixSystem;
import java.util.Set;
import org.apache.commons.lang.SystemUtils;
public class ServerEnvironment {
private static final boolean RUNNING_AS_ROOT_OR_ADMIN;
private static final String WINDOWS_HIGH_INTEGRITY_LEVEL = "S-1-16-12288";
static {
if (SystemUtils.IS_OS_WINDOWS) {
RUNNING_AS_ROOT_OR_ADMIN = Set.of(new NTSystem().getGroupIDs()).contains(WINDOWS_HIGH_INTEGRITY_LEVEL);
} else {
RUNNING_AS_ROOT_OR_ADMIN = new UnixSystem().getUid() == 0;
}
}
public static boolean userIsRootOrAdmin() {
return RUNNING_AS_ROOT_OR_ADMIN;
}
}