git-svn-id: http://mc-server.googlecode.com/svn/trunk@869 0a769ca7-a7f5-676a-18bf-c427514a06d6
752 lines
17 KiB
C++
752 lines
17 KiB
C++
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// Protocol132.cpp
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// Implements the cProtocol132 class representing the release 1.3.2 protocol (#39)
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#include "Globals.h"
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#include "Protocol132.h"
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#include "cRoot.h"
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#include "cServer.h"
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#include "cClientHandle.h"
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#include "CryptoPP/randpool.h"
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#include "cItem.h"
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#include "ChunkDataSerializer.h"
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#include "cPlayer.h"
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#include "cMonster.h"
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#include "UI/cWindow.h"
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#define HANDLE_PACKET_READ(Proc, Type, Var) \
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Type Var; \
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{ \
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if (!m_ReceivedData.Proc(Var)) \
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{ \
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return PARSE_INCOMPLETE; \
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} \
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}
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typedef unsigned char Byte;
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using namespace CryptoPP;
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const int MAX_ENC_LEN = 512; // Maximum size of the encrypted message; should be 128, but who knows...
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enum
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{
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PACKET_KEEP_ALIVE = 0x00,
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PACKET_LOGIN = 0x01,
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PACKET_COMPASS = 0x06,
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PACKET_PLAYER_SPAWN = 0x14,
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PACKET_SPAWN_MOB = 0x18,
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PACKET_DESTROY_ENTITIES = 0x1d,
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PACKET_CHUNK_DATA = 0x33,
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PACKET_BLOCK_CHANGE = 0x35,
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PACKET_BLOCK_ACTION = 0x36,
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PACKET_SOUND_EFFECT = 0x3e
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} ;
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// Converts a raw 160-bit SHA1 digest into a Java Hex representation
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// According to http://wiki.vg/wiki/index.php?title=Protocol_Encryption&oldid=2802
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static void DigestToJava(byte a_Digest[20], AString & a_Out)
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{
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bool IsNegative = (a_Digest[0] >= 0x80);
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if (IsNegative)
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{
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// Two's complement:
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bool carry = true; // Add one to the whole number
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for (int i = 19; i >= 0; i--)
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{
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a_Digest[i] = ~a_Digest[i];
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if (carry)
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{
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carry = (a_Digest[i] == 0xff);
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a_Digest[i]++;
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}
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}
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}
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a_Out.clear();
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a_Out.reserve(40);
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for (int i = 0; i < 20; i++)
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{
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AppendPrintf(a_Out, "%02x", a_Digest[i]);
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}
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while ((a_Out.length() > 0) && (a_Out[0] == '0'))
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{
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a_Out.erase(0, 1);
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}
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if (IsNegative)
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{
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a_Out.insert(0, "-");
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}
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}
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/*
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// Self-test the hash formatting for known values:
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// sha1(Notch) : 4ed1f46bbe04bc756bcb17c0c7ce3e4632f06a48
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// sha1(jeb_) : -7c9d5b0044c130109a5d7b5fb5c317c02b4e28c1
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// sha1(simon) : 88e16a1019277b15d58faf0541e11910eb756f6
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class Test
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{
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public:
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Test(void)
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{
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AString DigestNotch, DigestJeb, DigestSimon;
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byte Digest[20];
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CryptoPP::SHA1 Checksum;
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Checksum.Update((const byte *)"Notch", 5);
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Checksum.Final(Digest);
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DigestToJava(Digest, DigestNotch);
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Checksum.Restart();
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Checksum.Update((const byte *)"jeb_", 4);
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Checksum.Final(Digest);
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DigestToJava(Digest, DigestJeb);
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Checksum.Restart();
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Checksum.Update((const byte *)"simon", 5);
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Checksum.Final(Digest);
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DigestToJava(Digest, DigestSimon);
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printf("Notch: \"%s\"", DigestNotch.c_str());
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printf("jeb_: \"%s\"", DigestJeb.c_str());
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printf("simon: \"%s\"", DigestSimon.c_str());
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}
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} test;
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*/
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// cProtocol132:
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cProtocol132::cProtocol132(cClientHandle * a_Client) :
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super(a_Client),
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m_IsEncrypted(false)
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{
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}
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cProtocol132::~cProtocol132()
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{
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if (!m_DataToSend.empty())
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{
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LOGD("There are %d unsent bytes while deleting cProtocol132", m_DataToSend.size());
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}
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}
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void cProtocol132::DataReceived(const char * a_Data, int a_Size)
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{
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if (m_IsEncrypted)
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{
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byte Decrypted[512];
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while (a_Size > 0)
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{
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int NumBytes = (a_Size > sizeof(Decrypted)) ? sizeof(Decrypted) : a_Size;
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m_Decryptor.ProcessData(Decrypted, (byte *)a_Data, NumBytes);
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super::DataReceived((const char *)Decrypted, NumBytes);
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a_Size -= NumBytes;
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a_Data += NumBytes;
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}
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}
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else
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{
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super::DataReceived(a_Data, a_Size);
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}
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}
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void cProtocol132::SendBlockAction(int a_BlockX, int a_BlockY, int a_BlockZ, char a_Byte1, char a_Byte2, BLOCKTYPE a_BlockType)
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{
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cCSLock Lock(m_CSPacket);
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WriteByte (PACKET_BLOCK_ACTION);
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WriteInt (a_BlockX);
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WriteShort((short)a_BlockY);
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WriteInt (a_BlockZ);
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WriteByte (a_Byte1);
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WriteByte (a_Byte2);
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WriteShort(a_BlockType);
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Flush();
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}
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void cProtocol132::SendBlockChange(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta)
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{
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cCSLock Lock(m_CSPacket);
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WriteByte (PACKET_BLOCK_CHANGE);
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WriteInt (a_BlockX);
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WriteByte ((unsigned char)a_BlockY);
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WriteInt (a_BlockZ);
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WriteShort(a_BlockType);
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WriteByte (a_BlockMeta);
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Flush();
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}
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void cProtocol132::SendChunkData(int a_ChunkX, int a_ChunkZ, cChunkDataSerializer & a_Serializer)
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{
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cCSLock Lock(m_CSPacket);
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// Pre-chunk not used in 1.3.2. Finally.
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// Send the chunk data:
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AString Serialized = a_Serializer.Serialize(cChunkDataSerializer::RELEASE_1_3_2);
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WriteByte(PACKET_CHUNK_DATA);
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WriteInt (a_ChunkX);
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WriteInt (a_ChunkZ);
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SendData(Serialized.data(), Serialized.size());
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Flush();
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}
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void cProtocol132::SendDestroyEntity(const cEntity & a_Entity)
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{
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cCSLock Lock(m_CSPacket);
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WriteByte(PACKET_DESTROY_ENTITIES);
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WriteByte(1); // entity count
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WriteInt (a_Entity.GetUniqueID());
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Flush();
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}
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void cProtocol132::SendKeepAlive(int a_PingID)
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{
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cCSLock Lock(m_CSPacket);
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WriteByte(PACKET_KEEP_ALIVE);
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WriteInt (a_PingID);
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Flush();
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}
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void cProtocol132::SendLogin(const cPlayer & a_Player, const cWorld & a_World)
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{
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cCSLock Lock(m_CSPacket);
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WriteByte (PACKET_LOGIN);
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WriteInt (a_Player.GetUniqueID()); // EntityID of the player
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WriteString("default"); // Level type
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WriteByte ((int)a_Player.GetGameMode());
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WriteByte (0); // TODO: Dimension (Nether / Overworld / End)
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WriteByte (2); // TODO: Difficulty
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WriteByte (0); // Unused, used to be world height
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WriteByte (8); // Client list width or something
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Flush();
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SendCompass(a_World);
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}
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void cProtocol132::SendPlayerSpawn(const cPlayer & a_Player)
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{
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const cItem & HeldItem = a_Player.GetEquippedItem();
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cCSLock Lock(m_CSPacket);
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WriteByte (PACKET_PLAYER_SPAWN);
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WriteInt (a_Player.GetUniqueID());
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WriteString(a_Player.GetName());
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WriteInt ((int)(a_Player.GetPosX() * 32));
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WriteInt ((int)(a_Player.GetPosY() * 32));
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WriteInt ((int)(a_Player.GetPosZ() * 32));
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WriteByte ((char)((a_Player.GetRot().x / 360.f) * 256));
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WriteByte ((char)((a_Player.GetRot().y / 360.f) * 256));
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WriteShort (HeldItem.IsEmpty() ? 0 : HeldItem.m_ItemType);
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// Player metadata: just use a default metadata value, since the client doesn't like starting without any metadata:
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WriteByte (0); // Index 0, byte (flags)
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WriteByte (0); // Flags, empty
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WriteByte (0x7f); // End of metadata
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Flush();
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}
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void cProtocol132::SendSoundEffect(const AString & a_SoundName, int a_SrcX, int a_SrcY, int a_SrcZ, float a_Volume, float a_Pitch)
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{
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cCSLock Lock(m_CSPacket);
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WriteByte (PACKET_SOUND_EFFECT);
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WriteString (a_SoundName);
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WriteInt (a_SrcX);
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WriteInt (a_SrcY);
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WriteInt (a_SrcZ);
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WriteFloat (a_Volume);
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WriteByte ((char)(a_Pitch * 63.0f));
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Flush();
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}
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void cProtocol132::SendSpawnMob(const cMonster & a_Mob)
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{
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cCSLock Lock(m_CSPacket);
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WriteByte (PACKET_SPAWN_MOB);
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WriteInt (a_Mob.GetUniqueID());
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WriteByte (a_Mob.GetMobType());
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WriteVectorI((Vector3i)(a_Mob.GetPosition() * 32));
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WriteByte (0); // yaw
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WriteByte (0); // pitch
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WriteByte (0); // head yaw
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WriteShort (0); // Velocity Z
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WriteShort (0); // Velocity X
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WriteShort (0); // Velocity Y
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AString MetaData = GetEntityMetaData(a_Mob);
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SendData (MetaData.data(), MetaData.size());
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Flush();
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}
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void cProtocol132::SendUnloadChunk(int a_ChunkX, int a_ChunkZ)
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{
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// Not used in 1.3.2
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// Does it unload chunks on its own?
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}
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void cProtocol132::SendWholeInventory(const cWindow & a_Window)
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{
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// 1.3.2 requires player inventory slots to be sent as SetSlot packets,
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// otherwise it sometimes fails to update the window
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super::SendWholeInventory(a_Window);
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const cItem * Slots = m_Client->GetPlayer()->GetInventory().GetSlots();
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int BaseOffset = a_Window.GetNumSlots() - cInventory::c_NumSlots + cInventory::c_MainOffset; // the number of non-inventory slots the window has; inventory follows
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char WindowID = a_Window.GetWindowID();
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for (int i = 0; i < cInventory::c_NumSlots - cInventory::c_MainOffset; i++)
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{
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SendInventorySlot(WindowID, BaseOffset + i, Slots[i + cInventory::c_MainOffset]);
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} // for i - Slots[]
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// Send even the item being dragged:
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SendInventorySlot(-1, -1, m_Client->GetPlayer()->GetDraggingItem());
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}
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AString cProtocol132::GetAuthServerID(void)
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{
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// http://wiki.vg/wiki/index.php?title=Session&oldid=2615
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// Server uses SHA1 to mix ServerID, Client secret and server public key together
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// The mixing is done in StartEncryption, the result is in m_AuthServerID
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return m_AuthServerID;
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}
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int cProtocol132::ParsePacket(unsigned char a_PacketType)
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{
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switch (a_PacketType)
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{
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default: return super::ParsePacket(a_PacketType); // off-load previously known packets into cProtocol125
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case 0xcc: return ParseLocaleViewDistance();
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case 0xcd: return ParseClientStatuses();
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case 0xfc: return ParseEncryptionKeyResponse();
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}
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}
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int cProtocol132::ParseBlockPlace(void)
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{
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HANDLE_PACKET_READ(ReadBEInt, int, PosX);
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HANDLE_PACKET_READ(ReadByte, Byte, PosY);
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HANDLE_PACKET_READ(ReadBEInt, int, PosZ);
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HANDLE_PACKET_READ(ReadChar, char, Direction);
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cItem HeldItem;
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int res = ParseItem(HeldItem);
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if (res < 0)
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{
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return res;
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}
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HANDLE_PACKET_READ(ReadChar, char, CursorX);
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HANDLE_PACKET_READ(ReadChar, char, CursorY);
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HANDLE_PACKET_READ(ReadChar, char, CursorZ);
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m_Client->HandleBlockPlace(PosX, PosY, PosZ, Direction, HeldItem);
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return PARSE_OK;
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}
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int cProtocol132::ParseHandshake(void)
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{
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HANDLE_PACKET_READ(ReadByte, Byte, ProtocolVersion);
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HANDLE_PACKET_READ(ReadBEUTF16String16, AString, Username);
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HANDLE_PACKET_READ(ReadBEUTF16String16, AString, ServerHost);
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HANDLE_PACKET_READ(ReadBEInt, int, ServerPort);
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m_Username = Username;
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if (!m_Client->HandleHandshake( m_Username ))
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{
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return PARSE_OK; // Player is not allowed into the server
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}
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// Send a 0xFD Encryption Key Request http://wiki.vg/Protocol#0xFD
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CryptoPP::StringSink sink(m_ServerPublicKey); // GCC won't allow inline instantiation in the following line, damned temporary refs
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cRoot::Get()->GetServer()->GetPublicKey().Save(sink);
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SendEncryptionKeyRequest();
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return PARSE_OK;
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}
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int cProtocol132::ParseClientStatuses(void)
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{
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HANDLE_PACKET_READ(ReadByte, byte, Status);
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m_Client->HandleLogin(39, m_Username);
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return PARSE_OK;
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}
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int cProtocol132::ParseEncryptionKeyResponse(void)
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{
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HANDLE_PACKET_READ(ReadBEShort, short, EncKeyLength);
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AString EncKey;
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if (!m_ReceivedData.ReadString(EncKey, EncKeyLength))
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{
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return PARSE_INCOMPLETE;
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}
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HANDLE_PACKET_READ(ReadBEShort, short, EncNonceLength);
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AString EncNonce;
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if (!m_ReceivedData.ReadString(EncNonce, EncNonceLength))
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{
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return PARSE_INCOMPLETE;
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}
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if ((EncKeyLength > MAX_ENC_LEN) || (EncNonceLength > MAX_ENC_LEN))
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{
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LOGD("Too long encryption");
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m_Client->Kick("Hacked client");
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return PARSE_OK;
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}
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HandleEncryptionKeyResponse(EncKey, EncNonce);
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return PARSE_OK;
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}
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int cProtocol132::ParseLocaleViewDistance(void)
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{
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HANDLE_PACKET_READ(ReadBEUTF16String16, AString, Locale);
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HANDLE_PACKET_READ(ReadChar, char, ViewDistance);
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HANDLE_PACKET_READ(ReadChar, char, ChatFlags);
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HANDLE_PACKET_READ(ReadChar, char, ClientDifficulty);
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// TODO: m_Client->HandleLocale(Locale);
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// TODO: m_Client->HandleViewDistance(ViewDistance);
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// TODO: m_Client->HandleChatFlags(ChatFlags);
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// Ignoring client difficulty
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return PARSE_OK;
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}
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int cProtocol132::ParseLogin(void)
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{
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// Login packet not used in 1.3.2
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return PARSE_ERROR;
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}
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int cProtocol132::ParsePlayerAbilities(void)
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{
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HANDLE_PACKET_READ(ReadBool, bool, Flags);
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HANDLE_PACKET_READ(ReadChar, char, FlyingSpeed);
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HANDLE_PACKET_READ(ReadChar, char, WalkingSpeed);
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// TODO: m_Client->HandlePlayerAbilities(...);
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return PARSE_OK;
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}
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void cProtocol132::SendData(const char * a_Data, int a_Size)
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{
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m_DataToSend.append(a_Data, a_Size);
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}
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void cProtocol132::Flush(void)
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{
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ASSERT(m_CSPacket.IsLockedByCurrentThread()); // Did all packets lock the CS properly?
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if (m_DataToSend.empty())
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{
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LOGD("Flushing empty");
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return;
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}
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const char * a_Data = m_DataToSend.data();
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int a_Size = m_DataToSend.size();
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if (m_IsEncrypted)
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{
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byte Encrypted[8192]; // Larger buffer, we may be sending lots of data (chunks)
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while (a_Size > 0)
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{
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int NumBytes = (a_Size > sizeof(Encrypted)) ? sizeof(Encrypted) : a_Size;
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m_Encryptor.ProcessData(Encrypted, (byte *)a_Data, NumBytes);
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super::SendData((const char *)Encrypted, NumBytes);
|
|
a_Size -= NumBytes;
|
|
a_Data += NumBytes;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
super::SendData(a_Data, a_Size);
|
|
}
|
|
m_DataToSend.clear();
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cProtocol132::WriteItem(const cItem & a_Item)
|
|
{
|
|
short ItemType = a_Item.m_ItemType;
|
|
ASSERT(ItemType >= -1); // Check validity of packets in debug runtime
|
|
if (ItemType <= 0)
|
|
{
|
|
// Fix, to make sure no invalid values are sent.
|
|
ItemType = -1;
|
|
}
|
|
|
|
if (a_Item.IsEmpty())
|
|
{
|
|
WriteShort(-1);
|
|
return;
|
|
}
|
|
|
|
WriteShort(ItemType);
|
|
WriteByte (a_Item.m_ItemCount);
|
|
WriteShort(a_Item.m_ItemDamage);
|
|
|
|
// TODO: Implement enchantments
|
|
WriteShort(-1);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
int cProtocol132::ParseItem(cItem & a_Item)
|
|
{
|
|
HANDLE_PACKET_READ(ReadBEShort, short, ItemType);
|
|
|
|
if (ItemType <= -1)
|
|
{
|
|
a_Item.Empty();
|
|
return PARSE_OK;
|
|
}
|
|
a_Item.m_ItemType = ItemType;
|
|
|
|
HANDLE_PACKET_READ(ReadChar, char, ItemCount);
|
|
HANDLE_PACKET_READ(ReadBEShort, short, ItemDamage);
|
|
a_Item.m_ItemCount = ItemCount;
|
|
// a_Item.m_ItemDamage = ItemDamage;
|
|
if (ItemCount <= 0)
|
|
{
|
|
a_Item.Empty();
|
|
}
|
|
|
|
HANDLE_PACKET_READ(ReadBEShort, short, EnchantNumBytes);
|
|
if (EnchantNumBytes <= 0)
|
|
{
|
|
return PARSE_OK;
|
|
}
|
|
|
|
// TODO: Enchantment not implemented yet!
|
|
if (!m_ReceivedData.SkipRead(EnchantNumBytes))
|
|
{
|
|
return PARSE_INCOMPLETE;
|
|
}
|
|
|
|
return PARSE_OK;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cProtocol132::SendCompass(const cWorld & a_World)
|
|
{
|
|
cCSLock Lock(m_CSPacket);
|
|
WriteByte(PACKET_COMPASS);
|
|
WriteInt((int)(a_World.GetSpawnX()));
|
|
WriteInt((int)(a_World.GetSpawnY()));
|
|
WriteInt((int)(a_World.GetSpawnZ()));
|
|
Flush();
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cProtocol132::SendEncryptionKeyRequest(void)
|
|
{
|
|
cCSLock Lock(m_CSPacket);
|
|
WriteByte((char)0xfd);
|
|
WriteString(cRoot::Get()->GetServer()->GetServerID());
|
|
WriteShort((short)m_ServerPublicKey.size());
|
|
SendData(m_ServerPublicKey.data(), m_ServerPublicKey.size());
|
|
WriteShort(4);
|
|
WriteInt((int)(intptr_t)this); // Using 'this' as the cryptographic nonce, so that we don't have to generate one each time :)
|
|
Flush();
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cProtocol132::HandleEncryptionKeyResponse(const AString & a_EncKey, const AString & a_EncNonce)
|
|
{
|
|
// Decrypt EncNonce using privkey
|
|
RSAES<PKCS1v15>::Decryptor rsaDecryptor(cRoot::Get()->GetServer()->GetPrivateKey());
|
|
time_t CurTime = time(NULL);
|
|
CryptoPP::RandomPool rng;
|
|
rng.Put((const byte *)&CurTime, sizeof(CurTime));
|
|
byte DecryptedNonce[MAX_ENC_LEN];
|
|
DecodingResult res = rsaDecryptor.Decrypt(rng, (const byte *)a_EncNonce.data(), a_EncNonce.size(), DecryptedNonce);
|
|
if (!res.isValidCoding || (res.messageLength != 4))
|
|
{
|
|
LOGD("Bad nonce length");
|
|
m_Client->Kick("Hacked client");
|
|
return;
|
|
}
|
|
if (ntohl(*((int *)DecryptedNonce)) != (unsigned)(uintptr_t)this)
|
|
{
|
|
LOGD("Bad nonce value");
|
|
m_Client->Kick("Hacked client");
|
|
return;
|
|
}
|
|
|
|
// Decrypt the symmetric encryption key using privkey:
|
|
byte DecryptedKey[MAX_ENC_LEN];
|
|
res = rsaDecryptor.Decrypt(rng, (const byte *)a_EncKey.data(), a_EncKey.size(), DecryptedKey);
|
|
if (!res.isValidCoding || (res.messageLength != 16))
|
|
{
|
|
LOGD("Bad key length");
|
|
m_Client->Kick("Hacked client");
|
|
return;
|
|
}
|
|
|
|
{
|
|
// Send encryption key response:
|
|
cCSLock Lock(m_CSPacket);
|
|
WriteByte((char)0xfc);
|
|
WriteShort(0);
|
|
WriteShort(0);
|
|
Flush();
|
|
}
|
|
|
|
StartEncryption(DecryptedKey);
|
|
return;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cProtocol132::StartEncryption(const byte * a_Key)
|
|
{
|
|
m_Encryptor.SetKey(a_Key, 16, MakeParameters(Name::IV(), ConstByteArrayParameter(a_Key, 16))(Name::FeedbackSize(), 1));
|
|
m_Decryptor.SetKey(a_Key, 16, MakeParameters(Name::IV(), ConstByteArrayParameter(a_Key, 16))(Name::FeedbackSize(), 1));
|
|
m_IsEncrypted = true;
|
|
|
|
// Prepare the m_AuthServerID:
|
|
CryptoPP::SHA1 Checksum;
|
|
AString ServerID = cRoot::Get()->GetServer()->GetServerID();
|
|
Checksum.Update((const byte *)ServerID.c_str(), ServerID.length());
|
|
Checksum.Update(a_Key, 16);
|
|
Checksum.Update((const byte *)m_ServerPublicKey.c_str(), m_ServerPublicKey.length());
|
|
byte Digest[20];
|
|
Checksum.Final(Digest);
|
|
DigestToJava(Digest, m_AuthServerID);
|
|
}
|
|
|
|
|
|
|
|
|