/*
* This file is part of LanternServer, licensed under the MIT License (MIT).
*
* Copyright (c) LanternPowered <https://www.lanternpowered.org>
* Copyright (c) SpongePowered <https://www.spongepowered.org>
* Copyright (c) contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the Software), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/*
* Copyright (c) 2011-2014 Glowstone - Tad Hardesty
* Copyright (c) 2010-2011 Lightstone - Graham Edgecombe
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.lanternpowered.server.network.vanilla.message.handler.login;
import static org.lanternpowered.server.text.translation.TranslationHelper.t;
import com.google.common.collect.Multimap;
import com.google.gson.Gson;
import com.google.gson.JsonObject;
import org.lanternpowered.server.game.Lantern;
import org.lanternpowered.server.network.NetworkContext;
import org.lanternpowered.server.network.message.handler.Handler;
import org.lanternpowered.server.network.pipeline.MessageEncryptionHandler;
import org.lanternpowered.server.network.NetworkSession;
import org.lanternpowered.server.network.vanilla.message.type.login.MessageLoginInEncryptionResponse;
import org.lanternpowered.server.network.vanilla.message.type.login.MessageLoginInFinish;
import org.lanternpowered.server.profile.LanternGameProfile;
import org.lanternpowered.server.profile.LanternProfileProperty;
import org.lanternpowered.server.util.UUIDHelper;
import org.spongepowered.api.Sponge;
import org.spongepowered.api.event.SpongeEventFactory;
import org.spongepowered.api.event.cause.Cause;
import org.spongepowered.api.event.message.MessageEvent;
import org.spongepowered.api.event.network.ClientConnectionEvent;
import org.spongepowered.api.profile.property.ProfileProperty;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.math.BigInteger;
import java.net.URL;
import java.net.URLConnection;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.util.Arrays;
import java.util.UUID;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
public final class HandlerEncryptionResponse implements Handler<MessageLoginInEncryptionResponse> {
private final static String AUTH_BASE_URL =
"https://sessionserver.mojang.com/session/minecraft/hasJoined?username=%s&serverId=%s";
private final static Gson GSON = new Gson();
@Override
public void handle(NetworkContext context, MessageLoginInEncryptionResponse message) {
final NetworkSession session = context.getSession();
final PrivateKey privateKey = session.getServer().getKeyPair().getPrivate();
// Create rsaCipher
Cipher rsaCipher;
try {
rsaCipher = Cipher.getInstance("RSA");
} catch (GeneralSecurityException e) {
Lantern.getLogger().error("Could not initialize RSA cipher", e);
session.disconnect(t("Unable to initialize RSA cipher."));
return;
}
// Decrypt shared secret
SecretKey sharedSecret;
try {
rsaCipher.init(Cipher.DECRYPT_MODE, privateKey);
sharedSecret = new SecretKeySpec(rsaCipher.doFinal(message.getSharedSecret()), "AES");
} catch (Exception e) {
Lantern.getLogger().warn("Could not decrypt shared secret", e);
session.disconnect(t("Unable to decrypt shared secret."));
return;
}
// Decrypt verify token
byte[] verifyToken;
try {
rsaCipher.init(Cipher.DECRYPT_MODE, privateKey);
verifyToken = rsaCipher.doFinal(message.getVerifyToken());
} catch (Exception e) {
Lantern.getLogger().warn("Could not decrypt verify token", e);
session.disconnect(t("Unable to decrypt verify token."));
return;
}
LoginAuthData authData = context.getChannel().attr(HandlerLoginStart.AUTH_DATA).getAndRemove();
// Check verify token
if (!Arrays.equals(verifyToken, authData.getVerifyToken())) {
session.disconnect(t("Invalid verify token."));
return;
}
// Initialize stream encryption
session.getChannel().pipeline().replace(NetworkSession.ENCRYPTION, NetworkSession.ENCRYPTION,
new MessageEncryptionHandler(sharedSecret));
// Create hash for auth
String hash;
try {
MessageDigest digest = MessageDigest.getInstance("SHA-1");
digest.update(authData.getSessionId().getBytes());
digest.update(sharedSecret.getEncoded());
digest.update(session.getServer().getKeyPair().getPublic().getEncoded());
// BigInteger takes care of sign and leading zeroes
hash = new BigInteger(digest.digest()).toString(16);
} catch (NoSuchAlgorithmException e) {
Lantern.getLogger().error("Unable to generate SHA-1 digest", e);
session.disconnect(t("Failed to hash login data."));
return;
}
Lantern.getScheduler().submitAsyncTask(() -> {
performAuth(session, authData.getUsername(), hash);
return null;
});
}
private void performAuth(NetworkSession session, String username, String hash) {
final String postUrl = String.format(AUTH_BASE_URL, username, hash);
try {
// Authenticate
URLConnection connection = new URL(postUrl).openConnection();
JsonObject json;
try (InputStream is = connection.getInputStream()) {
if (is.available() == 0) {
session.disconnect(t("Invalid username or session id!"));
return;
}
try {
json = GSON.fromJson(new InputStreamReader(is), JsonObject.class);
} catch (Exception e) {
Lantern.getLogger().warn("Username \"{}\" failed to authenticate!", username);
session.disconnect(t("Failed to verify username!"));
return;
}
}
String name = json.get("name").getAsString();
String id = json.get("id").getAsString();
// Parse UUID
UUID uuid;
try {
uuid = UUIDHelper.fromFlatString(id);
} catch (IllegalArgumentException e) {
Lantern.getLogger().error("Returned authentication UUID invalid: {}", id, e);
session.disconnect(t("Invalid UUID."));
return;
}
Multimap<String, ProfileProperty> properties = LanternProfileProperty.createPropertiesMapFromJson(json.getAsJsonArray("properties"));
LanternGameProfile gameProfile = new LanternGameProfile(uuid, name, properties);
Lantern.getLogger().info("Finished authenticating.");
ClientConnectionEvent.Auth event = SpongeEventFactory.createClientConnectionEventAuth(Cause.source(gameProfile).build(), session,
new MessageEvent.MessageFormatter(t("disconnect.notAllowedToJoin")), gameProfile, false);
Sponge.getEventManager().post(event);
if (event.isCancelled()) {
session.disconnect(event.isMessageCancelled() ? t("disconnect.disconnected") : event.getMessage());
} else {
session.messageReceived(new MessageLoginInFinish(gameProfile));
}
} catch (Exception e) {
Lantern.getLogger().error("Error in authentication thread", e);
session.disconnect(t("Internal error during authentication."));
}
}
}