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Merge pull request #52 from otavepto/dev

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support older bind variants + auto unload on success or timeout
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Detanup01 2024-10-06 13:52:51 +02:00 committed by GitHub
commit 3a05ef636f
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3 changed files with 600 additions and 412 deletions
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65
tools/steamclient_loader/win/extra_protection/dllmain.cpp
View File

@ -1,6 +1,49 @@
#include "pe_helpers/pe_helpers.hpp"
#include "extra_protection/stubdrm.hpp" #include "extra_protection/stubdrm.hpp"
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#include <condition_variable>
#include <mutex>
#include <chrono>
#include <thread>
static std::mutex dll_unload_mtx{};
static std::condition_variable dll_unload_cv{};
static bool unload_dll = false;
static HMODULE my_hModule = nullptr;
static HANDLE unload_thread_handle = INVALID_HANDLE_VALUE;
static void send_unload_signal()
{
{
std::lock_guard lock(dll_unload_mtx);
unload_dll = true;
}
dll_unload_cv.notify_one();
}
DWORD WINAPI self_unload(LPVOID lpParameter)
{
constexpr const auto UNLOAD_TIMEOUT =
#ifdef _DEBUG
std::chrono::minutes(5)
#else
std::chrono::seconds(5)
#endif
;
{
std::unique_lock lock(dll_unload_mtx);
dll_unload_cv.wait_for(lock, UNLOAD_TIMEOUT, [](){ return unload_dll; });
}
unload_thread_handle = INVALID_HANDLE_VALUE;
FreeLibraryAndExitThread(my_hModule, 0);
}
BOOL APIENTRY DllMain( BOOL APIENTRY DllMain(
HMODULE hModule, HMODULE hModule,
DWORD reason, DWORD reason,
@ -9,14 +52,26 @@ BOOL APIENTRY DllMain(
switch (reason) switch (reason)
{ {
case DLL_PROCESS_ATTACH: case DLL_PROCESS_ATTACH:
stubdrm::patch(); if (!stubdrm::patch()) {
break; // https://learn.microsoft.com/en-us/windows/win32/dlls/dllmain
case DLL_THREAD_ATTACH: // "The system immediately calls your entry-point function with DLL_PROCESS_DETACH and unloads the DLL"
case DLL_THREAD_DETACH: unload_dll = true;
return FALSE;
}
my_hModule = hModule;
stubdrm::set_cleanup_cb(send_unload_signal);
unload_thread_handle = CreateThread(nullptr, 0, self_unload, nullptr, 0, nullptr);
break; break;
case DLL_PROCESS_DETACH: case DLL_PROCESS_DETACH:
if (!unload_dll) { // not unloaded yet, just an early exit, or thread timed out
stubdrm::restore(); stubdrm::restore();
if (unload_thread_handle != INVALID_HANDLE_VALUE && unload_thread_handle != NULL) {
TerminateThread(unload_thread_handle, 0);
}
}
break; break;
} }
return TRUE; return TRUE;
} }

6
tools/steamclient_loader/win/extra_protection/extra_protection/stubdrm.hpp
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@ -1,11 +1,9 @@
#pragma once #pragma once
#include <string>
#include <vector>
namespace stubdrm namespace stubdrm
{ {
bool patch(); bool patch();
bool restore(); bool restore();
void set_cleanup_cb(void (*fn)());
} }

281
tools/steamclient_loader/win/extra_protection/stubdrm.cpp
View File

@ -1,100 +1,138 @@
#include "extra_protection/stubdrm.hpp"
#include "pe_helpers/pe_helpers.hpp" #include "pe_helpers/pe_helpers.hpp"
#include "common_helpers/common_helpers.hpp" #include "common_helpers/common_helpers.hpp"
#include "extra_protection/stubdrm.hpp"
#include "detours/detours.h" #include "detours/detours.h"
#include <string>
#include <vector>
#include <tuple> #include <tuple>
#include <mutex> #include <mutex>
#include <intrin.h> #include <intrin.h>
// MinGW doesn't implement _AddressOfReturnAddress(), throws linker error // MinGW doesn't implement _AddressOfReturnAddress(), throws linker error
// https://gcc.gnu.org/onlinedocs/gcc/Return-Address.html // https://gcc.gnu.org/onlinedocs/gcc/Return-Address.html
// https://learn.microsoft.com/en-us/cpp/intrinsics/addressofreturnaddress
#if defined(__GNUC__) && (defined(__MINGW32__) || defined(__MINGW64__)) #if defined(__GNUC__) && (defined(__MINGW32__) || defined(__MINGW64__))
#define ADDR_OF_RET_ADDR() ((void*)((char*)__builtin_frame_address(0) + sizeof(void*))) #define ADDR_OF_RET_ADDR() ((void*)((char*)__builtin_frame_address(0) + sizeof(void*)))
#else // regular windows #else // regular windows
#define ADDR_OF_RET_ADDR() _AddressOfReturnAddress() #define ADDR_OF_RET_ADDR() _AddressOfReturnAddress()
#endif #endif
typedef struct SnrUnit { typedef struct _SnrUnit_t {
std::string search_patt{}; std::string search_patt{};
std::string replace_patt{}; std::string replace_patt{};
} SnrUnit_t; } SnrUnit_t;
typedef struct SnrDetails { typedef struct _StubSnrDetails_t {
std::string detection_patt{}; std::string stub_detection_patt{}; // inside the dynamically allocated stub
bool change_mem_access = false; bool change_mem_access = false;
std::vector<SnrUnit_t> snr_units{}; std::vector<SnrUnit_t> stub_snr_units{};
} SnrDetails_t; } StubSnrDetails_t;
typedef struct _BindSnrDetails_t {
std::string bind_detection_patt{}; // inside .bind
std::vector<StubSnrDetails_t> stub_details{};
} BindSnrDetails_t;
static const std::vector<BindSnrDetails_t> all_bind_details {
// x64 // x64
#if defined(_WIN64) #if defined(_WIN64)
static const std::vector<SnrDetails> snr_patts {
{ {
// detection_patt // bind_detection_patt
"FF 94 24 ?? ?? ?? ?? 88 44 24 ?? 0F BE 44 24 ?? 83 ?? 30 74 ?? E9", "FF 94 24 ?? ?? ?? ?? 88 44 24 ?? 0F BE 44 24 ?? 83 ?? 30 74 ?? E9", // appid 1684350
// stub_details
{
{
// stub_detection_patt
"??",
// change memory pages access to r/w/e // change memory pages access to r/w/e
false, false,
// snr_units // stub_snr_units
{ {
// patt 1 is a bunch of checks for registry + files validity (including custom DOS stub) // patt 1 is a bunch of checks for registry + files validity (including custom DOS stub)
// patt 2 is again a bunch of checks + creates some interfaces via steamclient + calls getappownershipticket() // patt 2 is again a bunch of checks + creates some interfaces via steamclient + calls getappownershipticket()
{ {
"E8 ?? ?? ?? ?? 84 C0 75 ?? B0 33 E9", "E8 ?? ?? ?? ?? 84 C0 75 ?? B0 3?",
"B8 01 00 00 00 ?? ?? EB", "B8 01 00 00 00 ?? ?? EB",
}, },
{ {
"E8 ?? ?? ?? ?? 44 0F B6 ?? 3C 30 0F 84 ?? ?? ?? ?? 3C 35 0F 85", "E8 ?? ?? ?? ?? 44 0F B6 ?? 3C 30 0F 84 ?? ?? ?? ?? 3C",
"B8 30 00 00 00 ?? ?? ?? ?? ?? ?? 90 E9", "B8 30 00 00 00 ?? ?? ?? ?? ?? ?? 90 E9",
}, },
}, },
}, },
},
},
{ {
// detection_patt // bind_detection_patt
"FF D? 44 0F B6 ?? 3C 30 0F 85", "FF D? 44 0F B6 ?? 3C 30 0F 85", // appid: 537450 (rare, only found in this appid!)
// stub_details
{
{
// stub_detection_patt
"??",
// change memory pages access to r/w/e // change memory pages access to r/w/e
false, false,
// snr_units // stub_snr_units
{
{
"E8 ?? ?? ?? ?? 44 0F B6 ?? 3C 30 0F 84 ?? ?? ?? ?? 3C ?? 0F 85",
"B8 30 00 00 00 ?? ?? ?? ?? ?? ?? 90 E9 ?? ?? ?? ?? ?? ?? ?? ??",
},
},
},
};
#endif
// x32
#if !defined(_WIN64)
static const std::vector<SnrDetails> snr_patts {
{
// detection_patt
"FF 95 ?? ?? ?? ?? 88 45 ?? 0F BE 4D ?? 83 ?? 30 74 ?? E9",
// change memory pages access to r/w/e
false,
// snr_units
{ {
// patt 1 is a bunch of checks for registry + files validity (including custom DOS stub) // patt 1 is a bunch of checks for registry + files validity (including custom DOS stub)
// patt 2 is again a bunch of checks + creates some interfaces via steamclient + calls getappownershipticket() // patt 2 is again a bunch of checks + creates some interfaces via steamclient + calls getappownershipticket()
{ {
"5? 5? E8 ?? ?? ?? ?? 83 C4 08 84 C0 75 ?? B0 33", "E8 ?? ?? ?? ?? 84 C0 75 ?? B0 3?",
"B8 01 00 00 00 ?? ?? EB",
},
{
"E8 ?? ?? ?? ?? 44 0F B6 ?? 3C 30 0F 84 ?? ?? ?? ?? 3C",
"B8 30 00 00 00 ?? ?? ?? ?? ?? ?? 90 E9",
},
},
},
},
},
#endif // x64
// x32
#if !defined(_WIN64)
{
// bind_detection_patt
"FF 95 ?? ?? ?? ?? 88 45 ?? 0F BE 4D ?? 83 ?? 30 74 ?? E9", // appid 588650
// stub_details
{
{
// stub_detection_patt
"??",
// change memory pages access to r/w/e
false,
// stub_snr_units
{
// patt 1 is a bunch of checks for registry + files validity (including custom DOS stub)
// patt 2 is again a bunch of checks + creates some interfaces via steamclient + calls getappownershipticket()
{
"5? 5? E8 ?? ?? ?? ?? 83 C4 08 84 C0 75",
"?? ?? B8 01 00 00 00 ?? ?? ?? ?? ?? EB", "?? ?? B8 01 00 00 00 ?? ?? ?? ?? ?? EB",
}, },
{ {
"E8 ?? ?? ?? ?? 83 C4 ?? 88 45 ?? 3C 30 0F 84 ?? ?? ?? ?? 3C 35 75", "E8 ?? ?? ?? ?? 83 C4 ?? 88 45 ?? 3C 30 0F 84 ?? ?? ?? ?? 3C 3?",
"B8 30 00 00 00 ?? ?? ?? ?? ?? ?? ?? ?? 90 E9", "B8 30 00 00 00 ?? ?? ?? ?? ?? ?? ?? ?? 90 E9",
}, },
}, },
}, },
},
},
{ {
// detection_patt // bind_detection_patt
"FF 95 ?? ?? ?? ?? 89 85 ?? ?? ?? ?? 8B ?? ?? ?? ?? ?? 89 ?? ?? ?? ?? ?? 8B ?? ?? 89 ?? ?? ?? ?? ?? 83 A5 ?? ?? ?? ?? ?? EB", "FF 95 ?? ?? ?? ?? 89 85 ?? ?? ?? ?? 8B ?? ?? ?? ?? ?? 89 ?? ?? ?? ?? ?? 8B ?? ?? 89 ?? ?? ?? ?? ?? 83 A5 ?? ?? ?? ?? ?? EB", // appid 201790
// stub_details
{
{
// stub_detection_patt
"??",
// change memory pages access to r/w/e // change memory pages access to r/w/e
true, true, // appid 48000
// snr_units // stub_snr_units
{ {
{ {
"F6 C? 02 0F 85 ?? ?? ?? ?? 5? FF ?? 6?", "F6 C? 02 0F 85 ?? ?? ?? ?? 5? FF ?? 6?",
@ -104,19 +142,26 @@ typedef struct SnrDetails {
"F6 C? 02 89 ?? ?? ?? ?? ?? A3 ?? ?? ?? ?? 0F 85", "F6 C? 02 89 ?? ?? ?? ?? ?? A3 ?? ?? ?? ?? 0F 85",
"?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 90 E9 00 03 00 00", "?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 90 E9 00 03 00 00",
}, },
{ { // appid 250180
"F6 05 ?? ?? ?? ?? 02 89 ?? ?? 0F 85 ?? ?? ?? ?? 5? FF ?? 6?", "F6 05 ?? ?? ?? ?? 02 89 ?? ?? 0F 85 ?? ?? ?? ?? 5? FF ?? 6?",
"?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 90 E9 03 03", "?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 90 E9 03 03",
}, },
}, },
}, },
},
},
{ {
// detection_patt // bind_detection_patt
"FF D? 88 45 ?? 3C 30 0F 85 ?? ?? ?? ?? B8 4D 5A", "FF D? 88 45 ?? 3C 30 0F 85 ?? ?? ?? ?? B8 4D 5A",
// stub_details
{
{
// stub_detection_patt
"??",
// change memory pages access to r/w/e // change memory pages access to r/w/e
false, false,
// snr_units // stub_snr_units
{ {
{ {
"5? E8 ?? ?? ?? ?? 83 C4 ?? 88 45 ?? 3C 30 0F 84", "5? E8 ?? ?? ?? ?? 83 C4 ?? 88 45 ?? 3C 30 0F 84",
@ -128,32 +173,80 @@ typedef struct SnrDetails {
}, },
}, },
}, },
},
},
}; {
// bind_detection_patt
"FF 95 ?? ?? ?? ?? 89 85 ?? ?? ?? ?? 8B ?? ?? ?? ?? ?? 89 ?? ?? ?? ?? ?? 8B ?? ?? ?? ?? ?? 89 ?? ?? ?? ?? ?? 83 A5 ?? ?? ?? ?? ?? EB", // appids: 31290, 94530, 37010
// stub_details
{
{ // appid 31290, 37010
// stub_detection_patt
"F6 05 ?? ?? ?? ?? 04 0F 85 ?? ?? ?? ?? A1 ?? ?? ?? ?? 89",
// change memory pages access to r/w/e
false,
// stub_snr_units
{
{
"F6 C? 02 89 ?? ?? ?? ?? ?? A3 ?? ?? ?? ?? 0F 85",
"?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 90 E9 57 02 00 00",
},
},
},
#endif // _WIN64 { // 94530
// stub_detection_patt
"84 ?? ?? ?? ?? ?? 0F 85 ?? ?? ?? ?? A1 ?? ?? ?? ?? 89",
// change memory pages access to r/w/e
false,
// stub_snr_units
{
{
"F6 C? 02 89 ?? ?? ?? ?? ?? A3 ?? ?? ?? ?? 0F 85",
"?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 90 E9 2A 02 00 00",
},
{
"6A 04 5? 5? 8D",
"?? ?? ?? E9 BF 00 00 00",
},
},
},
},
},
#endif // x32
};
static size_t current_snr_details = static_cast<size_t>(-1); static size_t current_bind_idx = static_cast<size_t>(-1);
static std::recursive_mutex mtx_win32_api{}; static uint8_t *exe_addr_base = (uint8_t *)GetModuleHandleW(nullptr);
static uint8_t *exe_addr_base = (uint8_t *)GetModuleHandleW(NULL);
static uint8_t *bind_addr_base = nullptr; static uint8_t *bind_addr_base = nullptr;
static uint8_t *bind_addr_end = nullptr; static uint8_t *bind_addr_end = nullptr;
static bool restore_win32_apis(); // this mutex is used to halt/defer the execution of threads if they tried to use the hooked functions at the same time
// just in case
static std::recursive_mutex mtx_win32_api{};
// these flags are used as a fallback in case Detours lib failed to restore the hooks
static bool GetTickCount_hooked = false;
static bool GetModuleHandleA_hooked = false;
static bool GetModuleHandleExA_hooked = false;
void (*cleanup_cb)() = nullptr;
// stub v2 needs manual change for .text, section must have write access
// old stub variant (found in appid 201790) needs manual change for .text section, it must have write access
static void change_mem_pages_access() static void change_mem_pages_access()
{ {
auto sections = pe_helpers::get_section_headers((HMODULE)exe_addr_base); auto sections = pe_helpers::get_section_headers((HMODULE)exe_addr_base);
if (!sections.count) return; if (!sections.count) return;
constexpr const static unsigned ANY_EXECUTE_RIGHT = PAGE_EXECUTE | PAGE_EXECUTE_READ | PAGE_EXECUTE_READWRITE | PAGE_EXECUTE_WRITECOPY;
for (size_t i = 0; i < sections.count; ++i) { for (size_t i = 0; i < sections.count; ++i) {
auto section = sections.ptr[i]; auto section = sections.ptr[i];
uint8_t *section_base_addr = exe_addr_base + section.VirtualAddress; uint8_t *section_base_addr = exe_addr_base + section.VirtualAddress;
MEMORY_BASIC_INFORMATION mbi{}; MEMORY_BASIC_INFORMATION mbi{};
constexpr const static auto ANY_EXECUTE_RIGHT = PAGE_EXECUTE | PAGE_EXECUTE_READ | PAGE_EXECUTE_READWRITE | PAGE_EXECUTE_WRITECOPY;
if (VirtualQuery((LPCVOID)section_base_addr, &mbi, sizeof(mbi)) && // function succeeded if (VirtualQuery((LPCVOID)section_base_addr, &mbi, sizeof(mbi)) && // function succeeded
(mbi.Protect & ANY_EXECUTE_RIGHT)) { // this page (not entire section) has execute rights (mbi.Protect & ANY_EXECUTE_RIGHT)) { // this page (not entire section) has execute rights
DWORD current_protection = 0; DWORD current_protection = 0;
@ -172,6 +265,14 @@ static void change_mem_pages_access()
} }
static void call_cleanup_cb()
{
if (cleanup_cb) {
cleanup_cb();
}
}
static bool restore_win32_apis();
static void patch_if_possible(void *ret_addr) static void patch_if_possible(void *ret_addr)
{ {
if (!ret_addr) return; if (!ret_addr) return;
@ -179,8 +280,30 @@ static void patch_if_possible(void *ret_addr)
auto page_details = pe_helpers::get_mem_page_details(ret_addr); auto page_details = pe_helpers::get_mem_page_details(ret_addr);
if (!page_details.BaseAddress || page_details.AllocationProtect != PAGE_READWRITE) return; if (!page_details.BaseAddress || page_details.AllocationProtect != PAGE_READWRITE) return;
// find stub variant
const StubSnrDetails_t *current_stub = nullptr;
const auto &bind_details = all_bind_details[current_bind_idx];
for (const auto &stub_details : bind_details.stub_details) {
auto mem = pe_helpers::search_memory(
(uint8_t *)page_details.BaseAddress,
page_details.RegionSize,
stub_details.stub_detection_patt);
if (mem) {
current_stub = &stub_details;
break;
}
}
if (!current_stub) {
// we can't remove hooks here, the drm allocates many pages with read/write access to decrypt other parts
// and their code also gets here, if we restore hooks then we can't patch the actual stub page (which comes much later)
return;
}
// patch all snr units inside stub
bool anything_found = false; bool anything_found = false;
for (const auto &snr_unit : snr_patts[current_snr_details].snr_units) { for (const auto &snr_unit : current_stub->stub_snr_units) {
auto mem = pe_helpers::search_memory( auto mem = pe_helpers::search_memory(
(uint8_t *)page_details.BaseAddress, (uint8_t *)page_details.BaseAddress,
page_details.RegionSize, page_details.RegionSize,
@ -200,49 +323,50 @@ static void patch_if_possible(void *ret_addr)
} }
if (anything_found) { if (anything_found) {
restore_win32_apis();
if (snr_patts[current_snr_details].change_mem_access) change_mem_pages_access();
}
// MessageBoxA(NULL, ("ret addr = " + std::to_string((size_t)ret_addr)).c_str(), "Patched", MB_OK); // MessageBoxA(NULL, ("ret addr = " + std::to_string((size_t)ret_addr)).c_str(), "Patched", MB_OK);
restore_win32_apis();
if (current_stub->change_mem_access) {
change_mem_pages_access();
}
call_cleanup_cb();
}
} }
// https://learn.microsoft.com/en-us/cpp/intrinsics/addressofreturnaddress
static bool GetTickCount_hooked = false;
static decltype(GetTickCount) *actual_GetTickCount = GetTickCount; static decltype(GetTickCount) *actual_GetTickCount = GetTickCount;
__declspec(noinline) __declspec(noinline)
static DWORD WINAPI GetTickCount_hook() static DWORD WINAPI GetTickCount_hook()
{ {
if (GetTickCount_hooked) { // unencrypted apps (like 270880 american truck) don't call GetModuleHandleA()
std::lock_guard lk(mtx_win32_api); std::lock_guard lk(mtx_win32_api);
if (GetTickCount_hooked) { // if we win arbitration and hooks are still intact
if (GetTickCount_hooked) { // american truck doesn't call GetModuleHandleA
void* *ret_ptr = (void**)ADDR_OF_RET_ADDR(); void* *ret_ptr = (void**)ADDR_OF_RET_ADDR();
patch_if_possible(*ret_ptr); patch_if_possible(*ret_ptr);
} }
}
return actual_GetTickCount(); return actual_GetTickCount();
} }
static bool GetModuleHandleA_hooked = false;
static decltype(GetModuleHandleA) *actual_GetModuleHandleA = GetModuleHandleA; static decltype(GetModuleHandleA) *actual_GetModuleHandleA = GetModuleHandleA;
__declspec(noinline) __declspec(noinline)
static HMODULE WINAPI GetModuleHandleA_hook( static HMODULE WINAPI GetModuleHandleA_hook(
LPCSTR lpModuleName LPCSTR lpModuleName
) )
{ {
std::lock_guard lk(mtx_win32_api);
if (GetModuleHandleA_hooked && if (GetModuleHandleA_hooked &&
lpModuleName && lpModuleName && lpModuleName[0] &&
common_helpers::ends_with_i(lpModuleName, "ntdll.dll")) { common_helpers::ends_with_i(lpModuleName, "ntdll.dll")) {
std::lock_guard lk(mtx_win32_api);
if (GetModuleHandleA_hooked) { // if we win arbitration and hooks are still intact
void* *ret_ptr = (void**)ADDR_OF_RET_ADDR(); void* *ret_ptr = (void**)ADDR_OF_RET_ADDR();
patch_if_possible(*ret_ptr); patch_if_possible(*ret_ptr);
} }
}
return actual_GetModuleHandleA(lpModuleName); return actual_GetModuleHandleA(lpModuleName);
} }
static bool GetModuleHandleExA_hooked = false;
static decltype(GetModuleHandleExA) *actual_GetModuleHandleExA = GetModuleHandleExA; static decltype(GetModuleHandleExA) *actual_GetModuleHandleExA = GetModuleHandleExA;
__declspec(noinline) __declspec(noinline)
static BOOL WINAPI GetModuleHandleExA_hook( static BOOL WINAPI GetModuleHandleExA_hook(
@ -251,18 +375,21 @@ static BOOL WINAPI GetModuleHandleExA_hook(
HMODULE *phModule HMODULE *phModule
) )
{ {
std::lock_guard lk(mtx_win32_api); constexpr const static unsigned HANDLE_FROM_ADDR = GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT;
if (GetModuleHandleExA_hooked && if (GetModuleHandleExA_hooked &&
(dwFlags == (GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT)) && (dwFlags & HANDLE_FROM_ADDR) &&
((uint8_t *)lpModuleName >= bind_addr_base && (uint8_t *)lpModuleName < bind_addr_end)) { ((uint8_t *)lpModuleName >= bind_addr_base && (uint8_t *)lpModuleName < bind_addr_end)) {
std::lock_guard lk(mtx_win32_api);
if (GetModuleHandleExA_hooked) { // if we win arbitration and hooks are still intact
void* *ret_ptr = (void**)ADDR_OF_RET_ADDR(); void* *ret_ptr = (void**)ADDR_OF_RET_ADDR();
patch_if_possible(*ret_ptr); patch_if_possible(*ret_ptr);
} }
}
return actual_GetModuleHandleExA(dwFlags, lpModuleName, phModule); return actual_GetModuleHandleExA(dwFlags, lpModuleName, phModule);
} }
static bool redirect_win32_apis() static bool redirect_win32_apis()
{ {
if (DetourTransactionBegin() != NO_ERROR) return false; if (DetourTransactionBegin() != NO_ERROR) return false;
@ -295,6 +422,7 @@ static bool restore_win32_apis()
return DetourTransactionCommit() == NO_ERROR; return DetourTransactionCommit() == NO_ERROR;
} }
static std::vector<uint8_t> get_pe_header_disk() static std::vector<uint8_t> get_pe_header_disk()
{ {
const std::string filepath = pe_helpers::get_current_exe_path() + pe_helpers::get_current_exe_name(); const std::string filepath = pe_helpers::get_current_exe_path() + pe_helpers::get_current_exe_name();
@ -351,6 +479,7 @@ static bool calc_bind_section_boundaries()
return true; return true;
} }
bool stubdrm::patch() bool stubdrm::patch()
{ {
if (!calc_bind_section_boundaries()) return false; if (!calc_bind_section_boundaries()) return false;
@ -358,14 +487,15 @@ bool stubdrm::patch()
auto addrOfEntry = exe_addr_base + pe_helpers::get_optional_header((HMODULE)exe_addr_base)->AddressOfEntryPoint; auto addrOfEntry = exe_addr_base + pe_helpers::get_optional_header((HMODULE)exe_addr_base)->AddressOfEntryPoint;
if (addrOfEntry < bind_addr_base || addrOfEntry >= bind_addr_end) return false; // entry addr is not inside .bind if (addrOfEntry < bind_addr_base || addrOfEntry >= bind_addr_end) return false; // entry addr is not inside .bind
for (const auto &patt : snr_patts) { // find .bind variant
for (const auto &patt : all_bind_details) {
auto mem = pe_helpers::search_memory( auto mem = pe_helpers::search_memory(
bind_addr_base, bind_addr_base,
static_cast<size_t>(bind_addr_end - bind_addr_base), static_cast<size_t>(bind_addr_end - bind_addr_base),
patt.detection_patt); patt.bind_detection_patt);
if (mem) { if (mem) {
current_snr_details = &patt - &snr_patts[0]; current_bind_idx = static_cast<size_t>(&patt - &all_bind_details[0]);
return redirect_win32_apis(); return redirect_win32_apis();
} }
} }
@ -377,3 +507,8 @@ bool stubdrm::restore()
{ {
return restore_win32_apis(); return restore_win32_apis();
} }
void stubdrm::set_cleanup_cb(void (*fn)())
{
cleanup_cb = fn;
}