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https://github.com/PaperMC/Paper.git
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89d51d5f29
Because this exploit has been widely known for years and has not been fixed by Mojang, we decided that it was worth allowing people to toggle it on/off due to how easy it is to make it configurable. It should be noted that this decision does not promise all future exploits will be configurable.
137 lines
9.3 KiB
Diff
137 lines
9.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Andrew Steinborn <git@steinborn.me>
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Date: Tue, 11 May 2021 17:39:22 -0400
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Subject: [PATCH] Add Unix domain socket support
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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 a78b14b828526549e1309e94c271667043129a87..6b4c9ef02931491dd048646ead494892f06504c5 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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@@ -219,6 +219,20 @@ public class DedicatedServer extends MinecraftServer implements ServerInterface
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this.setEnforceWhitelist(dedicatedserverproperties.enforceWhitelist);
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// this.worldData.setGameType(dedicatedserverproperties.gamemode); // CraftBukkit - moved to world loading
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DedicatedServer.LOGGER.info("Default game type: {}", dedicatedserverproperties.gamemode);
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+ // Paper start - Unix domain socket support
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+ java.net.SocketAddress bindAddress;
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+ if (this.getLocalIp().startsWith("unix:")) {
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+ if (!io.netty.channel.epoll.Epoll.isAvailable()) {
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+ DedicatedServer.LOGGER.error("**** INVALID CONFIGURATION!");
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+ DedicatedServer.LOGGER.error("You are trying to use a Unix domain socket but you're not on a supported OS.");
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+ return false;
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+ } else if (!io.papermc.paper.configuration.GlobalConfiguration.get().proxies.velocity.enabled && !org.spigotmc.SpigotConfig.bungee) {
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+ DedicatedServer.LOGGER.error("**** INVALID CONFIGURATION!");
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+ DedicatedServer.LOGGER.error("Unix domain sockets require IPs to be forwarded from a proxy.");
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+ return false;
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+ }
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+ bindAddress = new io.netty.channel.unix.DomainSocketAddress(this.getLocalIp().substring("unix:".length()));
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+ } else {
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InetAddress inetaddress = null;
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if (!this.getLocalIp().isEmpty()) {
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@@ -228,12 +242,15 @@ public class DedicatedServer extends MinecraftServer implements ServerInterface
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if (this.getPort() < 0) {
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this.setPort(dedicatedserverproperties.serverPort);
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}
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+ bindAddress = new java.net.InetSocketAddress(inetaddress, this.getPort());
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+ }
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+ // Paper end - Unix domain socket support
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this.initializeKeyPair();
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DedicatedServer.LOGGER.info("Starting Minecraft server on {}:{}", this.getLocalIp().isEmpty() ? "*" : this.getLocalIp(), this.getPort());
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try {
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- this.getConnection().startTcpServerListener(inetaddress, this.getPort());
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+ this.getConnection().bind(bindAddress); // Paper - Unix domain socket support
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} catch (IOException ioexception) {
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DedicatedServer.LOGGER.warn("**** FAILED TO BIND TO PORT!");
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DedicatedServer.LOGGER.warn("The exception was: {}", ioexception.toString());
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diff --git a/src/main/java/net/minecraft/server/network/ServerConnectionListener.java b/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
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index 25ddfe8e5da65e4ac70be2820ba139e7f3852c0c..87abd6274f9da9367094bad0c28acfa47e01c50e 100644
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--- a/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
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+++ b/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
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@@ -76,7 +76,12 @@ public class ServerConnectionListener {
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this.running = true;
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}
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+ // Paper start - Unix domain socket support
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public void startTcpServerListener(@Nullable InetAddress address, int port) throws IOException {
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+ bind(new java.net.InetSocketAddress(address, port));
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+ }
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+ public void bind(java.net.SocketAddress address) throws IOException {
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+ // Paper end - Unix domain socket support
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List list = this.channels;
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synchronized (this.channels) {
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@@ -84,7 +89,13 @@ public class ServerConnectionListener {
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EventLoopGroup eventloopgroup;
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if (Epoll.isAvailable() && this.server.isEpollEnabled()) {
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+ // Paper start - Unix domain socket support
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+ if (address instanceof io.netty.channel.unix.DomainSocketAddress) {
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+ oclass = io.netty.channel.epoll.EpollServerDomainSocketChannel.class;
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+ } else {
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oclass = EpollServerSocketChannel.class;
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+ }
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+ // Paper end - Unix domain socket support
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eventloopgroup = (EventLoopGroup) ServerConnectionListener.SERVER_EPOLL_EVENT_GROUP.get();
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ServerConnectionListener.LOGGER.info("Using epoll channel type");
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} else {
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@@ -115,7 +126,7 @@ public class ServerConnectionListener {
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((Connection) object).setListenerForServerboundHandshake(new ServerHandshakePacketListenerImpl(ServerConnectionListener.this.server, (Connection) object));
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io.papermc.paper.network.ChannelInitializeListenerHolder.callListeners(channel); // Paper - Add Channel initialization listeners
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}
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- }).group(eventloopgroup).localAddress(address, port)).option(ChannelOption.AUTO_READ, false).bind().syncUninterruptibly()); // CraftBukkit
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+ }).group(eventloopgroup).localAddress(address)).option(ChannelOption.AUTO_READ, false).bind().syncUninterruptibly()); // CraftBukkit // Paper - Unix domain socket support
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}
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}
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diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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index ba7f0f4e2840b88d8f53c5720752cfeed2493c49..a5dd14014fd214ec900e0c49064ee54b2f43ff8e 100644
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--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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@@ -2475,6 +2475,11 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
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// Spigot Start
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public SocketAddress getRawAddress()
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{
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+ // Paper start - Unix domain socket support; this can be nullable in the case of a Unix domain socket, so if it is, fake something
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+ if (connection.channel.remoteAddress() == null) {
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+ return new java.net.InetSocketAddress(java.net.InetAddress.getLoopbackAddress(), 0);
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+ }
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+ // Paper end - Unix domain socket support
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return this.connection.channel.remoteAddress();
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}
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// Spigot End
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diff --git a/src/main/java/net/minecraft/server/network/ServerHandshakePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerHandshakePacketListenerImpl.java
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index 0c6d172c8b723d2ceff7443dfe50ae280cb6dc2d..a53dd1ea02bd19826cd9fd337459b08e9533bce8 100644
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--- a/src/main/java/net/minecraft/server/network/ServerHandshakePacketListenerImpl.java
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+++ b/src/main/java/net/minecraft/server/network/ServerHandshakePacketListenerImpl.java
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@@ -45,6 +45,7 @@ public class ServerHandshakePacketListenerImpl implements ServerHandshakePacketL
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this.connection.setClientboundProtocolAfterHandshake(ClientIntent.LOGIN);
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// CraftBukkit start - Connection throttle
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try {
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+ if (!(this.connection.channel.localAddress() instanceof io.netty.channel.unix.DomainSocketAddress)) { // Paper - Unix domain socket support; the connection throttle is useless when you have a Unix domain socket
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long currentTime = System.currentTimeMillis();
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long connectionThrottle = this.server.server.getConnectionThrottle();
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InetAddress address = ((java.net.InetSocketAddress) this.connection.getRemoteAddress()).getAddress();
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@@ -73,6 +74,7 @@ public class ServerHandshakePacketListenerImpl implements ServerHandshakePacketL
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}
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}
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}
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+ } // Paper - Unix domain socket support
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} catch (Throwable t) {
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org.apache.logging.log4j.LogManager.getLogger().debug("Failed to check connection throttle", t);
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}
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@@ -131,8 +133,11 @@ public class ServerHandshakePacketListenerImpl implements ServerHandshakePacketL
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// Paper end - PlayerHandshakeEvent
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// if (org.spigotmc.SpigotConfig.bungee) { // Paper - comment out, we check above!
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if ( ( split.length == 3 || split.length == 4 ) && ( ServerHandshakePacketListenerImpl.BYPASS_HOSTCHECK || ServerHandshakePacketListenerImpl.HOST_PATTERN.matcher( split[1] ).matches() ) ) { // Paper - Add bypass host check
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+ // Paper start - Unix domain socket support
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+ java.net.SocketAddress socketAddress = this.connection.getRemoteAddress();
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this.connection.hostname = split[0];
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- this.connection.address = new java.net.InetSocketAddress(split[1], ((java.net.InetSocketAddress) this.connection.getRemoteAddress()).getPort());
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+ this.connection.address = new java.net.InetSocketAddress(split[1], socketAddress instanceof java.net.InetSocketAddress ? ((java.net.InetSocketAddress) socketAddress).getPort() : 0);
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+ // Paper end - Unix domain socket support
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this.connection.spoofedUUID = com.mojang.util.UndashedUuid.fromStringLenient( split[2] );
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} else
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{
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