iw4x-client/src/Components/Modules/AntiCheat.cpp

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#include "STDInclude.hpp"
namespace Components
{
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int AntiCheat::LastCheck = 0;
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std::string AntiCheat::Hash;
Utils::Hook AntiCheat::LoadLibHook[4];
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unsigned long AntiCheat::Flags = NO_FLAG;
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// 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
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__declspec(naked) void AntiCheat::NullSub()
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{
__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
}
}
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#if 0
__declspec(naked) void AntiCheat::CrashClient()
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{
static uint8_t crashProcedure[] =
{
// Variable space
0xDC, 0xC1, 0xDC, 0x05,
// Uninstall minidump handler
// This doesn't work anymore, due to the SetUnhandledExceptionFilter hook, but that's not important
//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
// Random stuff
0xBE, 0xFF, 0xC2, 0xF4, 0x3A,
};
__asm
{
// This does absolutely nothing :P
xor eax, eax
mov ebx, [esp + 4h]
shl ebx, 4h
setz bl
// Push the fake var onto the stack
push ebx
// Save the address to our crash procedure
mov eax, offset crashProcedure
push eax
// Unprotect the .text segment
push eax
push 40h
push 2D5FFFh
push 401001h
call VirtualProtect
// Increment to our crash procedure
// Skip variable space
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
}
}
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#else
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void AntiCheat::CrashClient()
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{
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#ifdef DEBUG_DETECTIONS
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MessageBoxA(0, "Check the log for more information!", "AntiCheat triggered", MB_ICONERROR);
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ExitProcess(0xFFFFFFFF);
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#else
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Utils::Hook::Set<BYTE>(0x41BA2C, 0xEB);
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#endif
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}
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#endif
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void AntiCheat::AssertCalleeModule(void* callee)
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{
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HMODULE hModuleSelf = nullptr, hModuleTarget = nullptr, hModuleProcess = GetModuleHandleA(NULL);
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GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS, reinterpret_cast<char*>(callee), &hModuleTarget);
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GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS, reinterpret_cast<char*>(AntiCheat::AssertCalleeModule), &hModuleSelf);
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if (!hModuleSelf || !hModuleTarget || !hModuleProcess || (hModuleTarget != hModuleSelf && hModuleTarget != hModuleProcess))
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{
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#ifdef DEBUG_DETECTIONS
char buffer[MAX_PATH] = { 0 };
GetModuleFileNameA(hModuleTarget, buffer, sizeof buffer);
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Logger::Print(Utils::String::VA("AntiCheat: Callee assertion failed: %X %s", reinterpret_cast<uint32_t>(callee), buffer));
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#endif
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//AntiCheat::CrashClient();
AntiCheat::Hash.append("\0", 1);
}
}
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// This has to be called when doing .text changes during runtime
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__declspec(noinline) void AntiCheat::EmptyHash()
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{
AntiCheat::LastCheck = 0;
AntiCheat::Hash.clear();
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AntiCheat::AssertCalleeModule(_ReturnAddress());
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}
void AntiCheat::InitLoadLibHook()
{
static uint8_t loadLibStub[] = { 0x33, 0xC0, 0xC2, 0x04, 0x00 }; // xor eax, eax; retn 04h
static uint8_t loadLibExStub[] = { 0x33, 0xC0, 0xC2, 0x0C, 0x00 }; // xor eax, eax; retn 0Ch
static uint8_t kernel32Str[] = { 0xB4, 0x9A, 0x8D, 0xB1, 0x9A, 0x93, 0xCC, 0xCD, 0xD1, 0x9B, 0x93, 0x93 }; // KerNel32.dll
static uint8_t loadLibAStr[] = { 0xB3, 0x90, 0x9E, 0x9B, 0xB3, 0x96, 0x9D, 0x8D, 0x9E, 0x8D, 0x86, 0xBE }; // LoadLibraryA
static uint8_t loadLibWStr[] = { 0xB3, 0x90, 0x9E, 0x9B, 0xB3, 0x96, 0x9D, 0x8D, 0x9E, 0x8D, 0x86, 0xA8 }; // LoadLibraryW
HMODULE kernel32 = GetModuleHandleA(Utils::String::XOR(std::string(reinterpret_cast<char*>(kernel32Str), sizeof kernel32Str), -1).data());
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if (kernel32)
{
FARPROC loadLibA = GetProcAddress(kernel32, Utils::String::XOR(std::string(reinterpret_cast<char*>(loadLibAStr), sizeof loadLibAStr), -1).data());
FARPROC loadLibW = GetProcAddress(kernel32, Utils::String::XOR(std::string(reinterpret_cast<char*>(loadLibWStr), sizeof loadLibWStr), -1).data());
if (loadLibA && loadLibW)
{
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#ifdef DEBUG_LOAD_LIBRARY
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AntiCheat::LoadLibHook[0].Initialize(loadLibA, LoadLibaryAStub, HOOK_JUMP);
AntiCheat::LoadLibHook[1].Initialize(loadLibW, LoadLibaryWStub, HOOK_JUMP);
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#else
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AntiCheat::LoadLibHook[0].Initialize(loadLibA, loadLibStub, HOOK_JUMP);
AntiCheat::LoadLibHook[1].Initialize(loadLibW, loadLibStub, HOOK_JUMP);
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#endif
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//AntiCheat::LoadLibHook[2].Initialize(LoadLibraryExA, loadLibExStub, HOOK_JUMP);
//AntiCheat::LoadLibHook[3].Initialize(LoadLibraryExW, loadLibExStub, HOOK_JUMP);
}
}
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}
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void AntiCheat::ReadIntegrityCheck()
{
static int lastCheck = Game::Sys_Milliseconds();
if ((Game::Sys_Milliseconds() - lastCheck) > 1000 * 70)
{
if (HANDLE h = OpenProcess(PROCESS_VM_READ, TRUE, GetCurrentProcessId()))
{
#ifdef DEBUG_DETECTIONS
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Logger::Print("AntiCheat: Process integrity check failed");
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#endif
CloseHandle(h);
AntiCheat::Hash.append("\0", 1);
}
}
// Set the integrity flag
AntiCheat::Flags |= AntiCheat::IntergrityFlag::READ_INTEGRITY_CHECK;
}
void AntiCheat::FlagIntegrityCheck()
{
static int lastCheck = Game::Sys_Milliseconds();
if ((Game::Sys_Milliseconds() - lastCheck) > 1000 * 180)
{
lastCheck = Game::Sys_Milliseconds();
unsigned long flags = ((AntiCheat::IntergrityFlag::MAX_FLAG - 1) << 1) - 1;
if (AntiCheat::Flags != flags)
{
#ifdef DEBUG_DETECTIONS
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Logger::Print(Utils::String::VA("AntiCheat: Flag integrity check failed: %X", AntiCheat::Flags));
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#endif
AntiCheat::CrashClient();
}
}
}
void AntiCheat::ScanIntegrityCheck()
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{
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static int count = 0;
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int lastCheck = AntiCheat::LastCheck;
int milliseconds = Game::Sys_Milliseconds();
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if (lastCheck) count = 0;
else ++count;
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if (milliseconds < 1000 * 40) return;
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// If there was no check within the last 120 seconds, crash!
if ((lastCheck && (milliseconds - lastCheck) > 1000 * 120) || count > 1)
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{
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#ifdef DEBUG_DETECTIONS
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Logger::Print("AntiCheat: Integrity check failed");
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#endif
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AntiCheat::CrashClient();
}
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// Set the integrity flag
AntiCheat::Flags |= AntiCheat::IntergrityFlag::SCAN_INTEGRITY_CHECK;
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}
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void AntiCheat::PerformCheck()
{
// 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);
// Set the hash, if none is set
if (AntiCheat::Hash.empty())
{
AntiCheat::Hash = hash;
}
// Crash if the hashes don't match
else if (AntiCheat::Hash != hash)
{
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#ifdef DEBUG_DETECTIONS
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Logger::Print("AntiCheat: Memory scan failed");
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#endif
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AntiCheat::CrashClient();
}
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// Set the memory scan flag
AntiCheat::Flags |= AntiCheat::IntergrityFlag::MEMORY_SCAN;
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}
void AntiCheat::Frame()
{
// Perform check only every 30 seconds
if (AntiCheat::LastCheck && (Game::Sys_Milliseconds() - AntiCheat::LastCheck) < 1000 * 30) return;
AntiCheat::LastCheck = Game::Sys_Milliseconds();
AntiCheat::PerformCheck();
}
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#ifdef DEBUG_LOAD_LIBRARY
HANDLE AntiCheat::LoadLibary(std::wstring library, void* callee)
{
HMODULE module;
char buffer[MAX_PATH] = { 0 };
GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS, reinterpret_cast<char*>(callee), &module);
GetModuleFileNameA(module, buffer, sizeof buffer);
MessageBoxA(0, fmt::sprintf("Loading library %s via %s %X", std::string(library.begin(), library.end()).data(), buffer, reinterpret_cast<uint32_t>(callee)).data(), 0, 0);
return LoadLibraryExW(library.data(), NULL, 0);
}
HANDLE WINAPI AntiCheat::LoadLibaryAStub(const char* library)
{
std::string lib(library);
return AntiCheat::LoadLibary(std::wstring(lib.begin(), lib.end()), _ReturnAddress());
}
HANDLE WINAPI AntiCheat::LoadLibaryWStub(const wchar_t* library)
{
return AntiCheat::LoadLibary(library, _ReturnAddress());
}
#endif
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void AntiCheat::UninstallLibHook()
{
for (int i = 0; i < ARRAYSIZE(AntiCheat::LoadLibHook); ++i)
{
AntiCheat::LoadLibHook[i].Uninstall();
}
}
void AntiCheat::InstallLibHook()
{
AntiCheat::LoadLibHook[0].Install();
AntiCheat::LoadLibHook[1].Install();
//AntiCheat::LoadLibHook[2].Install();
//AntiCheat::LoadLibHook[3].Install();
}
void AntiCheat::PatchWinAPI()
{
AntiCheat::UninstallLibHook();
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// Initialize directx
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Utils::Hook::Call<void()>(0x5078C0)();
AntiCheat::InstallLibHook();
}
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void AntiCheat::SoundInitStub(int a1, int a2, int a3)
{
AntiCheat::UninstallLibHook();
Game::SND_Init(a1, a2, a3);
AntiCheat::InstallLibHook();
}
void AntiCheat::SoundInitDriverStub()
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{
AntiCheat::UninstallLibHook();
Game::SND_InitDriver();
AntiCheat::InstallLibHook();
}
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void AntiCheat::LostD3DStub()
{
AntiCheat::UninstallLibHook();
// Reset directx
Utils::Hook::Call<void()>(0x508070)();
AntiCheat::InstallLibHook();
}
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__declspec(naked) void AntiCheat::CinematicStub()
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{
__asm
{
pushad
call AntiCheat::UninstallLibHook
popad
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call Game::R_Cinematic_StartPlayback_Now
pushad
call AntiCheat::InstallLibHook
popad
retn
}
}
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__declspec(naked) void AntiCheat::DObjGetWorldTagPosStub()
{
__asm
{
pushad
push[esp + 20h]
call AntiCheat::AssertCalleeModule
pop esi
popad
push ecx
mov ecx, [esp + 10h]
push 426585h
retn
}
}
__declspec(naked) void AntiCheat::AimTargetGetTagPosStub()
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{
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__asm
{
pushad
push [esp + 20h]
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call AntiCheat::AssertCalleeModule
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pop esi
popad
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sub esp, 14h
cmp dword ptr[esi + 0E0h], 1
push 56AC6Ah
ret
}
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}
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// TODO: Beautify that
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DWORD AntiCheat::ProtectProcess()
{
// Returned to caller
DWORD dwResult = (DWORD)-1;
// Released on exit
HANDLE hToken = NULL;
PVOID pTokenInfo = NULL;
PSID psidEveryone = NULL;
PSID psidSystem = NULL;
PSID psidAdmins = NULL;
PACL pDacl = NULL;
PSECURITY_DESCRIPTOR pSecDesc = NULL;
__try
{
// Scratch
DWORD dwSize = 0;
BOOL bResult = FALSE;
// If this fails, you can try to fallback to OpenThreadToken
if (!OpenProcessToken(GetCurrentProcess(), TOKEN_READ, &hToken))
{
dwResult = GetLastError();
assert(FALSE);
__leave; /*failed*/
}
bResult = GetTokenInformation(hToken, TokenUser, NULL, 0, &dwSize);
dwResult = GetLastError();
assert(bResult == FALSE && ERROR_INSUFFICIENT_BUFFER == dwResult);
if (!(bResult == FALSE && ERROR_INSUFFICIENT_BUFFER == dwResult)) { __leave; /*failed*/ }
if (dwSize)
{
pTokenInfo = HeapAlloc(GetProcessHeap(), 0, dwSize);
dwResult = GetLastError();
assert(NULL != pTokenInfo);
if (NULL == pTokenInfo) { __leave; /*failed*/ }
}
bResult = GetTokenInformation(hToken, TokenUser, pTokenInfo, dwSize, &dwSize);
dwResult = GetLastError();
assert(bResult && pTokenInfo);
if (!(bResult && pTokenInfo)) { __leave; /*failed*/ }
PSID psidCurUser = ((TOKEN_USER*)pTokenInfo)->User.Sid;
SID_IDENTIFIER_AUTHORITY sidEveryone = SECURITY_WORLD_SID_AUTHORITY;
bResult = AllocateAndInitializeSid(&sidEveryone, 1,
SECURITY_WORLD_RID, 0, 0, 0, 0, 0, 0, 0, &psidEveryone);
dwResult = GetLastError();
assert(bResult && psidEveryone);
if (!(bResult && psidEveryone)) { __leave; /*failed*/ }
SID_IDENTIFIER_AUTHORITY sidSystem = SECURITY_NT_AUTHORITY;
bResult = AllocateAndInitializeSid(&sidSystem, 1,
SECURITY_LOCAL_SYSTEM_RID, 0, 0, 0, 0, 0, 0, 0, &psidSystem);
dwResult = GetLastError();
assert(bResult && psidSystem);
if (!(bResult && psidSystem)) { __leave; /*failed*/ }
SID_IDENTIFIER_AUTHORITY sidAdministrators = SECURITY_NT_AUTHORITY;
bResult = AllocateAndInitializeSid(&sidAdministrators, 2,
SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS,
0, 0, 0, 0, 0, 0, &psidAdmins);
dwResult = GetLastError();
assert(bResult && psidAdmins);
if (!(bResult && psidAdmins)) { __leave; /*failed*/ }
const PSID psidArray[] =
{
psidEveryone, /* Deny most rights to everyone */
psidCurUser, /* Allow what was not denied */
psidSystem, /* Full control */
psidAdmins, /* Full control */
};
// Determine required size of the ACL
dwSize = sizeof(ACL);
// First the DENY, then the ALLOW
dwSize += GetLengthSid(psidArray[0]);
dwSize += sizeof(ACCESS_DENIED_ACE) - sizeof(DWORD);
for (UINT i = 1; i < _countof(psidArray); i++)
{
// DWORD is the SidStart field, which is not used for absolute format
dwSize += GetLengthSid(psidArray[i]);
dwSize += sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD);
}
pDacl = (PACL)HeapAlloc(GetProcessHeap(), 0, dwSize);
dwResult = GetLastError();
assert(NULL != pDacl);
if (NULL == pDacl) { __leave; /*failed*/ }
bResult = InitializeAcl(pDacl, dwSize, ACL_REVISION);
dwResult = GetLastError();
assert(TRUE == bResult);
if (FALSE == bResult) { __leave; /*failed*/ }
// Mimic Protected Process
// http://www.microsoft.com/whdc/system/vista/process_vista.mspx
// Protected processes allow PROCESS_TERMINATE, which is
// probably not appropriate for high integrity software.
static const DWORD dwPoison =
/*READ_CONTROL |*/ WRITE_DAC | WRITE_OWNER |
PROCESS_CREATE_PROCESS | PROCESS_CREATE_THREAD |
PROCESS_DUP_HANDLE | PROCESS_QUERY_INFORMATION |
PROCESS_SET_QUOTA | PROCESS_SET_INFORMATION |
PROCESS_VM_OPERATION | PROCESS_VM_READ | PROCESS_VM_WRITE |
// In addition to protected process
PROCESS_SUSPEND_RESUME | PROCESS_TERMINATE;
bResult = AddAccessDeniedAce(pDacl, ACL_REVISION, dwPoison, psidArray[0]);
dwResult = GetLastError();
assert(TRUE == bResult);
if (FALSE == bResult) { __leave; /*failed*/ }
// Standard and specific rights not explicitly denied
static const DWORD dwAllowed = ~dwPoison & 0x1FFF;
bResult = AddAccessAllowedAce(pDacl, ACL_REVISION, dwAllowed, psidArray[1]);
dwResult = GetLastError();
assert(TRUE == bResult);
if (FALSE == bResult) { __leave; /*failed*/ }
// Because of ACE ordering, System will effectively have dwAllowed even
// though the ACE specifies PROCESS_ALL_ACCESS (unless software uses
// SeDebugPrivilege or SeTcbName and increases access).
// As an exercise, check behavior of tools such as Process Explorer under XP,
// Vista, and above. Vista and above should exhibit slightly different behavior
// due to Restricted tokens.
bResult = AddAccessAllowedAce(pDacl, ACL_REVISION, PROCESS_ALL_ACCESS, psidArray[2]);
dwResult = GetLastError();
assert(TRUE == bResult);
if (FALSE == bResult) { __leave; /*failed*/ }
// Because of ACE ordering, Administrators will effectively have dwAllowed
// even though the ACE specifies PROCESS_ALL_ACCESS (unless the Administrator
// invokes 'discretionary security' by taking ownership and increasing access).
// As an exercise, check behavior of tools such as Process Explorer under XP,
// Vista, and above. Vista and above should exhibit slightly different behavior
// due to Restricted tokens.
bResult = AddAccessAllowedAce(pDacl, ACL_REVISION, PROCESS_ALL_ACCESS, psidArray[3]);
dwResult = GetLastError();
assert(TRUE == bResult);
if (FALSE == bResult) { __leave; /*failed*/ }
pSecDesc = (PSECURITY_DESCRIPTOR)HeapAlloc(GetProcessHeap(), 0, SECURITY_DESCRIPTOR_MIN_LENGTH);
dwResult = GetLastError();
assert(NULL != pSecDesc);
if (NULL == pSecDesc) { __leave; /*failed*/ }
// InitializeSecurityDescriptor initializes a security descriptor in
// absolute format, rather than self-relative format. See
// http://msdn.microsoft.com/en-us/library/aa378863(VS.85).aspx
bResult = InitializeSecurityDescriptor(pSecDesc, SECURITY_DESCRIPTOR_REVISION);
dwResult = GetLastError();
assert(TRUE == bResult);
if (FALSE == bResult) { __leave; /*failed*/ }
bResult = SetSecurityDescriptorDacl(pSecDesc, TRUE, pDacl, FALSE);
dwResult = GetLastError();
assert(TRUE == bResult);
if (FALSE == bResult) { __leave; /*failed*/ }
dwResult = SetSecurityInfo(
GetCurrentProcess(),
SE_KERNEL_OBJECT, // process object
OWNER_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION,
psidCurUser, // NULL, // Owner SID
NULL, // Group SID
pDacl,
NULL // SACL
);
dwResult = GetLastError();
assert(ERROR_SUCCESS == dwResult);
if (ERROR_SUCCESS != dwResult) { __leave; /*failed*/ }
dwResult = ERROR_SUCCESS;
}
__finally
{
if (NULL != pSecDesc)
{
HeapFree(GetProcessHeap(), 0, pSecDesc);
}
if (NULL != pDacl)
{
HeapFree(GetProcessHeap(), 0, pDacl);
}
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if (psidAdmins)
{
FreeSid(psidAdmins);
}
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if (psidSystem)
{
FreeSid(psidSystem);
}
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if (psidEveryone)
{
FreeSid(psidEveryone);
}
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if (NULL != pTokenInfo)
{
HeapFree(GetProcessHeap(), 0, pTokenInfo);
}
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if (NULL != hToken)
{
CloseHandle(hToken);
}
}
return dwResult;
}
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AntiCheat::AntiCheat()
{
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AntiCheat::EmptyHash();
#ifdef DEBUG
Command::Add("penis", [] (Command::Params)
{
AntiCheat::CrashClient();
});
#else
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Utils::Hook(0x507BD5, AntiCheat::PatchWinAPI, HOOK_CALL).Install()->Quick();
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Utils::Hook(0x5082FD, AntiCheat::LostD3DStub, HOOK_CALL).Install()->Quick();
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Utils::Hook(0x51C76C, AntiCheat::CinematicStub, HOOK_CALL).Install()->Quick();
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Utils::Hook(0x418209, AntiCheat::SoundInitStub, HOOK_CALL).Install()->Quick();
Utils::Hook(0x60BE9D, AntiCheat::SoundInitStub, HOOK_CALL).Install()->Quick();
Utils::Hook(0x60BE8E, AntiCheat::SoundInitDriverStub, HOOK_CALL).Install()->Quick();
Utils::Hook(0x418204, AntiCheat::SoundInitDriverStub, HOOK_CALL).Install()->Quick();
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QuickPatch::OnFrame(AntiCheat::Frame);
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// Detect aimbots
Utils::Hook(0x426580, AntiCheat::DObjGetWorldTagPosStub, HOOK_JUMP).Install()->Quick();
Utils::Hook(0x56AC60, AntiCheat::AimTargetGetTagPosStub, HOOK_JUMP).Install()->Quick();
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// TODO: Probably move that :P
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if (!Dedicated::IsEnabled())
{
AntiCheat::InitLoadLibHook();
}
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// Prevent external processes from accessing our memory
AntiCheat::ProtectProcess();
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// Set the integrity flag
AntiCheat::Flags |= AntiCheat::IntergrityFlag::INITIALIZATION;
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#endif
}
AntiCheat::~AntiCheat()
{
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AntiCheat::Flags = NO_FLAG;
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AntiCheat::EmptyHash();
for (int i = 0; i < ARRAYSIZE(AntiCheat::LoadLibHook); ++i)
{
AntiCheat::LoadLibHook[i].Uninstall();
}
}
}