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Restructure "net" packages

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This commit is contained in:
P0nk
2021-07-18 14:26:23 +02:00
parent 11e83522d6
commit 9e3f3cc036
16 changed files with 93 additions and 99 deletions
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27
src/main/java/net/encryption/ClientCyphers.java Normal file
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package net.encryption;
import constants.net.ServerConstants;
public class ClientCyphers {
private final MapleAESOFB send;
private final MapleAESOFB receive;
private ClientCyphers(MapleAESOFB send, MapleAESOFB receive) {
this.send = send;
this.receive = receive;
}
public static ClientCyphers of(InitializationVector sendIv, InitializationVector receiveIv) {
MapleAESOFB send = new MapleAESOFB(sendIv, (short) (0xFFFF - ServerConstants.VERSION));
MapleAESOFB receive = new MapleAESOFB(receiveIv, ServerConstants.VERSION);
return new ClientCyphers(send, receive);
}
public MapleAESOFB getSendCypher() {
return send;
}
public MapleAESOFB getReceiveCypher() {
return receive;
}
}

27
src/main/java/net/encryption/InitializationVector.java Normal file
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package net.encryption;
public class InitializationVector {
private final byte[] bytes;
private InitializationVector(byte[] bytes) {
this.bytes = bytes;
}
public byte[] getBytes() {
return bytes;
}
public static InitializationVector generateSend() {
byte[] ivSend = {82, 48, 120, getRandomByte()};
return new InitializationVector(ivSend);
}
public static InitializationVector generateReceive() {
byte[] ivRecv = {70, 114, 122, getRandomByte()};
return new InitializationVector(ivRecv);
}
private static byte getRandomByte() {
return (byte) (Math.random() * 255);
}
}

219
src/main/java/net/encryption/MapleAESOFB.java Normal file
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/*
This file is part of the OdinMS Maple Story Server
Copyright (C) 2008 Patrick Huy <patrick.huy@frz.cc>
Matthias Butz <matze@odinms.de>
Jan Christian Meyer <vimes@odinms.de>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation version 3 as published by
the Free Software Foundation. You may not use, modify or distribute
this program under any other version of the GNU Affero General Public
License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package net.encryption;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import tools.HexTool;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
public class MapleAESOFB {
private static final Logger log = LoggerFactory.getLogger(MapleAESOFB.class);
private final static SecretKeySpec skey = new SecretKeySpec(
new byte[]{
0x13, 0x00, 0x00, 0x00,
0x08, 0x00, 0x00, 0x00,
0x06, 0x00, 0x00, 0x00,
(byte) 0xB4, 0x00, 0x00, 0x00,
0x1B, 0x00, 0x00, 0x00,
0x0F, 0x00, 0x00, 0x00,
0x33, 0x00, 0x00, 0x00,
0x52, 0x00, 0x00, 0x00}, "AES");
private static final byte[] funnyBytes = new byte[]{
(byte) 0xEC, (byte) 0x3F, (byte) 0x77, (byte) 0xA4, (byte) 0x45, (byte) 0xD0, (byte) 0x71, (byte) 0xBF,
(byte) 0xB7, (byte) 0x98, (byte) 0x20, (byte) 0xFC, (byte) 0x4B, (byte) 0xE9, (byte) 0xB3, (byte) 0xE1,
(byte) 0x5C, (byte) 0x22, (byte) 0xF7, (byte) 0x0C, (byte) 0x44, (byte) 0x1B, (byte) 0x81, (byte) 0xBD,
(byte) 0x63, (byte) 0x8D, (byte) 0xD4, (byte) 0xC3, (byte) 0xF2, (byte) 0x10, (byte) 0x19, (byte) 0xE0,
(byte) 0xFB, (byte) 0xA1, (byte) 0x6E, (byte) 0x66, (byte) 0xEA, (byte) 0xAE, (byte) 0xD6, (byte) 0xCE,
(byte) 0x06, (byte) 0x18, (byte) 0x4E, (byte) 0xEB, (byte) 0x78, (byte) 0x95, (byte) 0xDB, (byte) 0xBA,
(byte) 0xB6, (byte) 0x42, (byte) 0x7A, (byte) 0x2A, (byte) 0x83, (byte) 0x0B, (byte) 0x54, (byte) 0x67,
(byte) 0x6D, (byte) 0xE8, (byte) 0x65, (byte) 0xE7, (byte) 0x2F, (byte) 0x07, (byte) 0xF3, (byte) 0xAA,
(byte) 0x27, (byte) 0x7B, (byte) 0x85, (byte) 0xB0, (byte) 0x26, (byte) 0xFD, (byte) 0x8B, (byte) 0xA9,
(byte) 0xFA, (byte) 0xBE, (byte) 0xA8, (byte) 0xD7, (byte) 0xCB, (byte) 0xCC, (byte) 0x92, (byte) 0xDA,
(byte) 0xF9, (byte) 0x93, (byte) 0x60, (byte) 0x2D, (byte) 0xDD, (byte) 0xD2, (byte) 0xA2, (byte) 0x9B,
(byte) 0x39, (byte) 0x5F, (byte) 0x82, (byte) 0x21, (byte) 0x4C, (byte) 0x69, (byte) 0xF8, (byte) 0x31,
(byte) 0x87, (byte) 0xEE, (byte) 0x8E, (byte) 0xAD, (byte) 0x8C, (byte) 0x6A, (byte) 0xBC, (byte) 0xB5,
(byte) 0x6B, (byte) 0x59, (byte) 0x13, (byte) 0xF1, (byte) 0x04, (byte) 0x00, (byte) 0xF6, (byte) 0x5A,
(byte) 0x35, (byte) 0x79, (byte) 0x48, (byte) 0x8F, (byte) 0x15, (byte) 0xCD, (byte) 0x97, (byte) 0x57,
(byte) 0x12, (byte) 0x3E, (byte) 0x37, (byte) 0xFF, (byte) 0x9D, (byte) 0x4F, (byte) 0x51, (byte) 0xF5,
(byte) 0xA3, (byte) 0x70, (byte) 0xBB, (byte) 0x14, (byte) 0x75, (byte) 0xC2, (byte) 0xB8, (byte) 0x72,
(byte) 0xC0, (byte) 0xED, (byte) 0x7D, (byte) 0x68, (byte) 0xC9, (byte) 0x2E, (byte) 0x0D, (byte) 0x62,
(byte) 0x46, (byte) 0x17, (byte) 0x11, (byte) 0x4D, (byte) 0x6C, (byte) 0xC4, (byte) 0x7E, (byte) 0x53,
(byte) 0xC1, (byte) 0x25, (byte) 0xC7, (byte) 0x9A, (byte) 0x1C, (byte) 0x88, (byte) 0x58, (byte) 0x2C,
(byte) 0x89, (byte) 0xDC, (byte) 0x02, (byte) 0x64, (byte) 0x40, (byte) 0x01, (byte) 0x5D, (byte) 0x38,
(byte) 0xA5, (byte) 0xE2, (byte) 0xAF, (byte) 0x55, (byte) 0xD5, (byte) 0xEF, (byte) 0x1A, (byte) 0x7C,
(byte) 0xA7, (byte) 0x5B, (byte) 0xA6, (byte) 0x6F, (byte) 0x86, (byte) 0x9F, (byte) 0x73, (byte) 0xE6,
(byte) 0x0A, (byte) 0xDE, (byte) 0x2B, (byte) 0x99, (byte) 0x4A, (byte) 0x47, (byte) 0x9C, (byte) 0xDF,
(byte) 0x09, (byte) 0x76, (byte) 0x9E, (byte) 0x30, (byte) 0x0E, (byte) 0xE4, (byte) 0xB2, (byte) 0x94,
(byte) 0xA0, (byte) 0x3B, (byte) 0x34, (byte) 0x1D, (byte) 0x28, (byte) 0x0F, (byte) 0x36, (byte) 0xE3,
(byte) 0x23, (byte) 0xB4, (byte) 0x03, (byte) 0xD8, (byte) 0x90, (byte) 0xC8, (byte) 0x3C, (byte) 0xFE,
(byte) 0x5E, (byte) 0x32, (byte) 0x24, (byte) 0x50, (byte) 0x1F, (byte) 0x3A, (byte) 0x43, (byte) 0x8A,
(byte) 0x96, (byte) 0x41, (byte) 0x74, (byte) 0xAC, (byte) 0x52, (byte) 0x33, (byte) 0xF0, (byte) 0xD9,
(byte) 0x29, (byte) 0x80, (byte) 0xB1, (byte) 0x16, (byte) 0xD3, (byte) 0xAB, (byte) 0x91, (byte) 0xB9,
(byte) 0x84, (byte) 0x7F, (byte) 0x61, (byte) 0x1E, (byte) 0xCF, (byte) 0xC5, (byte) 0xD1, (byte) 0x56,
(byte) 0x3D, (byte) 0xCA, (byte) 0xF4, (byte) 0x05, (byte) 0xC6, (byte) 0xE5, (byte) 0x08, (byte) 0x49};
private final short mapleVersion;
private final Cipher cipher;
private byte[] iv;
public MapleAESOFB(InitializationVector iv, short mapleVersion) {
try {
cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skey);
} catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException e) {
log.warn("Cypher initialization error with skey: {}", skey, e);
throw new RuntimeException(e);
}
this.iv = iv.getBytes();
this.mapleVersion = (short) (((mapleVersion >> 8) & 0xFF) | ((mapleVersion << 8) & 0xFF00));
}
private static byte[] multiplyBytes(byte[] in, int count, int mul) {
final int size = count * mul;
byte[] ret = new byte[size];
for (int x = 0; x < size; x++) {
ret[x] = in[x % count];
}
return ret;
}
public synchronized byte[] crypt(byte[] data) {
int remaining = data.length;
int llength = 0x5B0;
int start = 0;
while (remaining > 0) {
byte[] myIv = multiplyBytes(this.iv, 4, 4);
if (remaining < llength) {
llength = remaining;
}
for (int x = start; x < (start + llength); x++) {
if ((x - start) % myIv.length == 0) {
try {
byte[] newIv = cipher.doFinal(myIv);
System.arraycopy(newIv, 0, myIv, 0, myIv.length);
} catch (IllegalBlockSizeException | BadPaddingException e) {
e.printStackTrace();
}
}
data[x] ^= myIv[(x - start) % myIv.length];
}
start += llength;
remaining -= llength;
llength = 0x5B4;
}
updateIv();
return data;
}
private synchronized void updateIv() {
this.iv = getNewIv(this.iv);
}
public byte[] getPacketHeader(int length) {
int iiv = (iv[3]) & 0xFF;
iiv |= (iv[2] << 8) & 0xFF00;
iiv ^= mapleVersion;
int mlength = ((length << 8) & 0xFF00) | (length >>> 8);
int xoredIv = iiv ^ mlength;
byte[] ret = new byte[4];
ret[0] = (byte) ((iiv >>> 8) & 0xFF);
ret[1] = (byte) (iiv & 0xFF);
ret[2] = (byte) ((xoredIv >>> 8) & 0xFF);
ret[3] = (byte) (xoredIv & 0xFF);
return ret;
}
public static int getPacketLength(int packetHeader) {
int packetLength = ((packetHeader >>> 16) ^ (packetHeader & 0xFFFF));
packetLength = ((packetLength << 8) & 0xFF00) | ((packetLength >>> 8) & 0xFF);
return packetLength;
}
private boolean checkPacket(byte[] packet) {
return ((((packet[0] ^ iv[2]) & 0xFF) == ((mapleVersion >> 8) & 0xFF)) &&
(((packet[1] ^ iv[3]) & 0xFF) == (mapleVersion & 0xFF)));
}
public boolean isValidHeader(int packetHeader) {
byte[] packetHeaderBuf = new byte[2];
packetHeaderBuf[0] = (byte) ((packetHeader >> 24) & 0xFF);
packetHeaderBuf[1] = (byte) ((packetHeader >> 16) & 0xFF);
return checkPacket(packetHeaderBuf);
}
public static byte[] getNewIv(byte[] oldIv) {
byte[] in = {(byte) 0xf2, 0x53, (byte) 0x50, (byte) 0xc6};
for (int x = 0; x < 4; x++) {
funnyShit(oldIv[x], in);
}
return in;
}
@Override
public String toString() {
return "IV: " + HexTool.toString(this.iv);
}
private static byte[] funnyShit(byte inputByte, byte[] in) {
byte elina = in[1];
byte anna = inputByte;
byte moritz = funnyBytes[(int) elina & 0xFF];
moritz -= inputByte;
in[0] += moritz;
moritz = in[2];
moritz ^= funnyBytes[(int) anna & 0xFF];
elina -= (int) moritz & 0xFF;
in[1] = elina;
elina = in[3];
moritz = elina;
elina -= (int) in[0] & 0xFF;
moritz = funnyBytes[(int) moritz & 0xFF];
moritz += inputByte;
moritz ^= in[2];
in[2] = moritz;
elina += (int) funnyBytes[(int) anna & 0xFF] & 0xFF;
in[3] = elina;
int merry = ((int) in[0]) & 0xFF;
merry |= (in[1] << 8) & 0xFF00;
merry |= (in[2] << 16) & 0xFF0000;
merry |= (in[3] << 24) & 0xFF000000;
int ret_value = merry;
ret_value = ret_value >>> 0x1d;
merry = merry << 3;
ret_value = ret_value | merry;
in[0] = (byte) (ret_value & 0xFF);
in[1] = (byte) ((ret_value >> 8) & 0xFF);
in[2] = (byte) ((ret_value >> 16) & 0xFF);
in[3] = (byte) ((ret_value >> 24) & 0xFF);
return in;
}
}

9
src/main/java/net/encryption/PacketCodec.java Normal file
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package net.encryption;
import io.netty.channel.CombinedChannelDuplexHandler;
public class PacketCodec extends CombinedChannelDuplexHandler<PacketDecoder, PacketEncoder> {
public PacketCodec(ClientCyphers clientCyphers) {
super(new PacketDecoder(clientCyphers.getReceiveCypher()), new PacketEncoder(clientCyphers.getSendCypher()));
}
}

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src/main/java/net/encryption/PacketDecoder.java Normal file
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package net.encryption;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ReplayingDecoder;
import net.MapleCustomEncryption;
import net.netty.InvalidPacketHeaderException;
import net.packet.ByteBufInPacket;
import java.util.List;
public class PacketDecoder extends ReplayingDecoder<Void> {
private final MapleAESOFB receiveCypher;
public PacketDecoder(MapleAESOFB receiveCypher) {
this.receiveCypher = receiveCypher;
}
@Override
protected void decode(ChannelHandlerContext context, ByteBuf in, List<Object> out) {
final int header = in.readInt();
if (!receiveCypher.isValidHeader(header)) {
throw new InvalidPacketHeaderException("Attempted to decode a packet with an invalid header", header);
}
final int packetLength = decodePacketLength(header);
byte[] packet = new byte[packetLength];
in.readBytes(packet);
receiveCypher.crypt(packet);
MapleCustomEncryption.decryptData(packet);
out.add(new ByteBufInPacket(Unpooled.wrappedBuffer(packet)));
}
/**
* @param header Packet header - the first 4 bytes of the packet
* @return Packet size in bytes
*/
private static int decodePacketLength(byte[] header) {
return (((header[1] ^ header[3]) & 0xFF) << 8) | ((header[0] ^ header[2]) & 0xFF);
}
private static int decodePacketLength(int header) {
int length = ((header >>> 16) ^ (header & 0xFFFF));
length = ((length << 8) & 0xFF00) | ((length >>> 8) & 0xFF);
return length;
}
}

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src/main/java/net/encryption/PacketEncoder.java Normal file
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package net.encryption;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;
import net.MapleCustomEncryption;
import net.packet.OutPacket;
public class PacketEncoder extends MessageToByteEncoder<OutPacket> {
private final MapleAESOFB sendCypher;
public PacketEncoder(MapleAESOFB sendCypher) {
this.sendCypher = sendCypher;
}
@Override
protected void encode(ChannelHandlerContext ctx, OutPacket in, ByteBuf out) {
byte[] packet = in.getBytes();
out.writeBytes(getEncodedHeader(packet.length));
MapleCustomEncryption.encryptData(packet);
sendCypher.crypt(packet);
out.writeBytes(packet);
}
private byte[] getEncodedHeader(int length) {
return sendCypher.getPacketHeader(length);
}
}