2016-02-29 08:47:21 -05:00
|
|
|
#include "STDInclude.hpp"
|
|
|
|
|
|
|
|
namespace Components
|
|
|
|
{
|
2016-02-29 11:30:04 -05:00
|
|
|
int AntiCheat::LastCheck;
|
2016-02-29 08:47:21 -05:00
|
|
|
std::string AntiCheat::Hash;
|
|
|
|
|
2016-02-29 14:38:14 -05:00
|
|
|
// This function does nothing, it only adds the two passed variables and returns the value
|
|
|
|
// The only important thing it does is to clean the first parameter, and then return
|
|
|
|
// By returning, the crash procedure will be called, as it hasn't been cleaned from the stack
|
|
|
|
void __declspec(naked) AntiCheat::NullSub()
|
|
|
|
{
|
|
|
|
__asm
|
|
|
|
{
|
|
|
|
push ebp
|
|
|
|
push ecx
|
|
|
|
mov ebp, esp
|
|
|
|
|
|
|
|
xor eax, eax
|
|
|
|
mov eax, [ebp + 8h]
|
|
|
|
mov ecx, [ebp + 0Ch]
|
|
|
|
add eax, ecx
|
|
|
|
|
|
|
|
pop ecx
|
|
|
|
pop ebp
|
|
|
|
retn 4
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-02-29 08:47:21 -05:00
|
|
|
void __declspec(naked) AntiCheat::CrashClient()
|
|
|
|
{
|
|
|
|
static uint8_t crashProcedure[] =
|
|
|
|
{
|
2016-02-29 14:38:14 -05:00
|
|
|
// Variable space
|
|
|
|
0xDC, 0xC1, 0xDC, 0x05,
|
|
|
|
|
2016-02-29 08:47:21 -05:00
|
|
|
// Uninstall minidump handler
|
|
|
|
0xB8, 0x63, 0xE7, 0x2F, 0x00, // mov eax, 2FE763h
|
|
|
|
0x05, 0xAD, 0xAD, 0x3C, 0x00, // add eax, 3CADADh
|
|
|
|
0x6A, 0x58, // push 88
|
|
|
|
0x8B, 0x80, 0xEA, 0x01, 0x00, 0x00, // mov eax, [eax + 1EAh]
|
|
|
|
0xFF, 0x10, // call dword ptr [eax]
|
|
|
|
|
|
|
|
// Crash me.
|
|
|
|
0xB8, 0x4F, 0x91, 0x27, 0x00, // mov eax, 27914Fh
|
|
|
|
0x05, 0xDD, 0x28, 0x1A, 0x00, // add eax, 1A28DDh
|
|
|
|
0x80, 0x00, 0x68, // add byte ptr [eax], 68h
|
|
|
|
0xC3, // retn
|
2016-02-29 14:38:14 -05:00
|
|
|
|
|
|
|
// Random stuff
|
|
|
|
0xBE, 0xFF, 0xC2, 0xF4, 0x3A,
|
2016-02-29 08:47:21 -05:00
|
|
|
};
|
|
|
|
|
|
|
|
__asm
|
|
|
|
{
|
|
|
|
// This does absolutely nothing :P
|
|
|
|
xor eax, eax
|
|
|
|
mov ebx, [esp + 4h]
|
|
|
|
shl ebx, 4h
|
2016-02-29 14:38:14 -05:00
|
|
|
setz bl
|
|
|
|
|
|
|
|
// Push the fake var onto the stack
|
|
|
|
push ebx
|
|
|
|
|
|
|
|
// Get address to VirtualProtect
|
|
|
|
mov eax, 6567h
|
|
|
|
shl eax, 0Ch
|
|
|
|
or eax, 70000A50h
|
|
|
|
|
|
|
|
// Move the address into ebx
|
|
|
|
push eax
|
|
|
|
pop ebx
|
|
|
|
|
|
|
|
// Save the address to our crash procedure
|
|
|
|
mov eax, offset crashProcedure
|
|
|
|
push eax
|
2016-02-29 08:47:21 -05:00
|
|
|
|
2016-02-29 14:38:14 -05:00
|
|
|
// Unprotect the .text segment
|
|
|
|
push eax
|
|
|
|
push 40h
|
|
|
|
push 2D5FFFh
|
|
|
|
push 401001h
|
|
|
|
call ebx
|
|
|
|
|
|
|
|
// Increment to our crash procedure
|
|
|
|
add dword ptr [esp], 4h
|
|
|
|
|
|
|
|
// This basically removes the pushed ebx value from the stack, so returning results in a call to the procedure
|
|
|
|
jmp AntiCheat::NullSub
|
2016-02-29 08:47:21 -05:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// This has to be called when doing .text changes during runtime
|
|
|
|
void AntiCheat::EmptyHash()
|
|
|
|
{
|
2016-02-29 11:30:04 -05:00
|
|
|
AntiCheat::LastCheck = 0;
|
2016-02-29 08:47:21 -05:00
|
|
|
AntiCheat::Hash.clear();
|
|
|
|
}
|
|
|
|
|
2016-02-29 14:38:14 -05:00
|
|
|
void AntiCheat::PerformCheck()
|
2016-02-29 08:47:21 -05:00
|
|
|
{
|
2016-02-29 14:38:14 -05:00
|
|
|
// Hash .text segment
|
|
|
|
// Add 1 to each value, so searching in memory doesn't reveal anything
|
|
|
|
size_t textSize = 0x2D6001;
|
|
|
|
uint8_t* textBase = reinterpret_cast<uint8_t*>(0x401001);
|
|
|
|
std::string hash = Utils::Cryptography::SHA512::Compute(textBase - 1, textSize - 1, false);
|
2016-02-29 08:47:21 -05:00
|
|
|
|
|
|
|
// Set the hash, if none is set
|
|
|
|
if (AntiCheat::Hash.empty())
|
|
|
|
{
|
|
|
|
AntiCheat::Hash = hash;
|
|
|
|
}
|
|
|
|
// Crash if the hashes don't match
|
2016-02-29 14:38:14 -05:00
|
|
|
else if (AntiCheat::Hash != hash)
|
2016-02-29 08:47:21 -05:00
|
|
|
{
|
|
|
|
AntiCheat::CrashClient();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-02-29 14:38:14 -05:00
|
|
|
void AntiCheat::Frame()
|
|
|
|
{
|
|
|
|
// Perform check only every 30 seconds
|
|
|
|
if (AntiCheat::LastCheck && (Game::Com_Milliseconds() - AntiCheat::LastCheck) < 1000 * 30) return;
|
|
|
|
AntiCheat::LastCheck = Game::Com_Milliseconds();
|
|
|
|
|
|
|
|
AntiCheat::PerformCheck();
|
|
|
|
}
|
|
|
|
|
2016-02-29 08:47:21 -05:00
|
|
|
AntiCheat::AntiCheat()
|
|
|
|
{
|
2016-02-29 11:30:04 -05:00
|
|
|
AntiCheat::EmptyHash();
|
|
|
|
|
2016-02-29 08:47:21 -05:00
|
|
|
Renderer::OnFrame(AntiCheat::Frame);
|
|
|
|
Dedicated::OnFrame(AntiCheat::Frame);
|
|
|
|
|
|
|
|
#ifdef DEBUG
|
|
|
|
Command::Add("penis", [] (Command::Params)
|
|
|
|
{
|
|
|
|
AntiCheat::CrashClient();
|
|
|
|
});
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
AntiCheat::~AntiCheat()
|
|
|
|
{
|
|
|
|
AntiCheat::EmptyHash();
|
|
|
|
}
|
|
|
|
}
|