Rim/iw4x-client
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[AntiCheat] Use more efficient hashing

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This commit is contained in:
momo5502 2017-07-03 22:17:46 +02:00
parent 0c2c7bb7e9
commit b54b18806f
3 changed files with 14 additions and 16 deletions
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27
src/Components/Modules/AntiCheat.cpp
View File

@ -3,7 +3,6 @@
namespace Components
{
Utils::Time::Interval AntiCheat::LastCheck;
std::string AntiCheat::Hash;
Utils::Hook AntiCheat::CreateThreadHook;
Utils::Hook AntiCheat::LoadLibHook[6];
Utils::Hook AntiCheat::VirtualProtectHook[2];
@ -200,6 +199,8 @@ namespace Components
void AntiCheat::PerformScan()
{
static std::optional<unsigned int> hashVal;
// Perform check only every 20 seconds
if (!AntiCheat::LastCheck.elapsed(20s)) return;
AntiCheat::LastCheck.update();
@ -207,16 +208,17 @@ namespace Components
// 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);
char* textBase = reinterpret_cast<char*>(0x401001);
unsigned int hash = Utils::Cryptography::JenkinsOneAtATime::Compute(textBase - 1, textSize - 1);
// Set the hash, if none is set
if (AntiCheat::Hash.empty())
if (!hashVal.has_value())
{
AntiCheat::Hash = hash;
hashVal.emplace(hash);
}
// Crash if the hashes don't match
else if (AntiCheat::Hash != hash)
else if (hashVal.value() != hash)
{
#ifdef DEBUG_DETECTIONS
Logger::Print("AntiCheat: Memory scan failed");
@ -232,7 +234,7 @@ namespace Components
void AntiCheat::QuickCodeScanner1()
{
static Utils::Time::Interval interval;
static std::optional<std::string> hashVal;
static std::optional<unsigned int> hashVal;
if (!interval.elapsed(32s)) return;
interval.update();
@ -240,8 +242,8 @@ namespace Components
// Hash .text segment
// Add 1 to each value, so searching in memory doesn't reveal anything
size_t textSize = 0x2D5FFF;
uint8_t* textBase = reinterpret_cast<uint8_t*>(0x400FFF);
std::string hash = Utils::Cryptography::SHA256::Compute(textBase + 1, textSize + 1, false);
char* textBase = reinterpret_cast<char*>(0x400FFF);
unsigned int hash = Utils::Cryptography::JenkinsOneAtATime::Compute(textBase + 1, textSize + 1);
if (hashVal.has_value() && hash != hashVal.value())
{
@ -254,13 +256,13 @@ namespace Components
void AntiCheat::QuickCodeScanner2()
{
static Utils::Time::Interval interval;
static std::optional<std::string> hashVal;
static std::optional<unsigned int> hashVal;
if (!interval.elapsed(42s)) return;
interval.update();
// Hash .text segment
std::string hash = Utils::Cryptography::SHA1::Compute(reinterpret_cast<uint8_t*>(0x401000), 0x2D6000, false);
unsigned int hash = Utils::Cryptography::JenkinsOneAtATime::Compute(reinterpret_cast<char*>(0x401000), 0x2D6000);
if (hashVal.has_value() && hash != hashVal.value())
{
Utils::Hook::Set<BYTE>(0x40797C, 0x90); // Crash
@ -788,7 +790,6 @@ namespace Components
{
time(nullptr);
AntiCheat::Flags = NO_FLAG;
AntiCheat::Hash.clear();
#ifdef DEBUG
Command::Add("penis", [](Command::Params*)
@ -831,8 +832,6 @@ namespace Components
AntiCheat::~AntiCheat()
{
AntiCheat::Flags = NO_FLAG;
AntiCheat::Hash.clear();
AntiCheat::OwnThreadIds.clear();
AntiCheat::ThreadHookMap.clear();

1
src/Components/Modules/AntiCheat.hpp
View File

@ -57,7 +57,6 @@ namespace Components
};
static Utils::Time::Interval LastCheck;
static std::string Hash;
static unsigned long Flags;
static void PerformScan();

2
src/Components/Modules/Node.hpp
View File

@ -1,7 +1,7 @@
#pragma once
#define NODE_HALFLIFE (3 * 60 * 1000) //3min
#define NODE_REQUEST_LIMIT 10
#define NODE_REQUEST_LIMIT 3
namespace Components
{