719 lines
20 KiB
C++
719 lines
20 KiB
C++
#include <std_include.hpp>
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#include "loader/component_loader.hpp"
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#include "scheduler.hpp"
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#include "steam/steam.hpp"
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#include <utils/hook.hpp>
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#include "utils/io.hpp"
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#include "utils/string.hpp"
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#include "utils/thread.hpp"
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#define ProcessDebugPort 7
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#define ProcessDebugObjectHandle 30 // WinXP source says 31?
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#define ProcessDebugFlags 31 // WinXP source says 32?
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namespace arxan
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{
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namespace
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{
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constexpr auto pseudo_steam_id = 0x1337;
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const auto pseudo_steam_handle = reinterpret_cast<HANDLE>(reinterpret_cast<uint64_t>(INVALID_HANDLE_VALUE) -
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pseudo_steam_id);
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utils::hook::detour nt_close_hook;
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utils::hook::detour nt_query_system_information_hook;
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utils::hook::detour nt_query_information_process_hook;
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utils::hook::detour create_mutex_ex_a_hook;
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utils::hook::detour open_process_hook;
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utils::hook::detour create_thread_hook;
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utils::hook::detour get_thread_context_hook;
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utils::hook::detour zw_terminate_process_hook;
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utils::hook::detour get_proc_address_hook;
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void* original_first_tls_callback = nullptr;
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void** get_tls_callbacks()
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{
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const utils::nt::library game{};
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const auto& entry = game.get_optional_header()->DataDirectory[IMAGE_DIRECTORY_ENTRY_TLS];
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if (!entry.VirtualAddress || !entry.Size)
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{
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return nullptr;
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}
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const auto* tls_dir = reinterpret_cast<IMAGE_TLS_DIRECTORY*>(game.get_ptr() + entry.VirtualAddress);
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return reinterpret_cast<void**>(tls_dir->AddressOfCallBacks);
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}
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void disable_tls_callbacks()
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{
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auto* tls_callbacks = get_tls_callbacks();
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if (tls_callbacks)
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{
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original_first_tls_callback = *tls_callbacks;
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}
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utils::hook::set(tls_callbacks, nullptr);
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}
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void restore_tls_callbacks()
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{
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auto* tls_callbacks = get_tls_callbacks();
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if (tls_callbacks)
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{
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utils::hook::set(tls_callbacks, original_first_tls_callback);
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}
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}
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HANDLE WINAPI create_thread_stub(const LPSECURITY_ATTRIBUTES thread_attributes, const SIZE_T stack_size,
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const LPTHREAD_START_ROUTINE start_address, const LPVOID parameter,
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const DWORD creation_flags,
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const LPDWORD thread_id)
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{
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if (utils::nt::library::get_by_address(start_address) == utils::nt::library{})
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{
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restore_tls_callbacks();
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create_thread_hook.clear();
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return CreateThread(thread_attributes, stack_size, start_address, parameter, creation_flags,
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thread_id);
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}
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return create_thread_hook.invoke<HANDLE>(thread_attributes, stack_size, start_address, parameter,
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creation_flags, thread_id);
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}
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HANDLE process_id_to_handle(const DWORD pid)
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{
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return reinterpret_cast<HANDLE>(static_cast<DWORD64>(pid));
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}
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HANDLE WINAPI open_process_stub(const DWORD access, const BOOL inherit, const DWORD pid)
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{
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if (pid == pseudo_steam_id)
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{
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return pseudo_steam_handle;
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}
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return open_process_hook.invoke<HANDLE>(access, inherit, pid);
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}
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HANDLE create_mutex_ex_a_stub(const LPSECURITY_ATTRIBUTES attributes, const LPCSTR name, const DWORD flags,
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const DWORD access)
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{
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if (name == "$ IDA trusted_idbs"s || name == "$ IDA registry mutex $"s)
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{
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return nullptr;
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}
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return create_mutex_ex_a_hook.invoke<HANDLE>(attributes, name, flags, access);
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}
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bool remove_evil_keywords_from_string(const UNICODE_STRING& string)
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{
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static const std::wstring evil_keywords[] =
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{
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L"IDA",
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L"ida",
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L"HxD",
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L"cheatengine",
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L"Cheat Engine",
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L"x96dbg",
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L"x32dbg",
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L"x64dbg",
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L"Wireshark",
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};
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if (!string.Buffer || !string.Length)
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{
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return false;
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}
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std::wstring_view path(string.Buffer, string.Length / sizeof(string.Buffer[0]));
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bool modified = false;
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for (const auto& keyword : evil_keywords)
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{
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while (true)
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{
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const auto pos = path.find(keyword);
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if (pos == std::wstring::npos)
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{
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break;
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}
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modified = true;
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for (size_t i = 0; i < keyword.size(); ++i)
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{
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string.Buffer[pos + i] = L'a';
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}
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}
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}
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return modified;
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}
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bool remove_evil_keywords_from_string(wchar_t* str, const size_t length)
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{
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UNICODE_STRING unicode_string{};
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unicode_string.Buffer = str;
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unicode_string.Length = static_cast<uint16_t>(length);
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unicode_string.MaximumLength = unicode_string.Length;
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return remove_evil_keywords_from_string(unicode_string);
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}
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bool remove_evil_keywords_from_string(char* str, const size_t length)
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{
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std::string_view str_view(str, length);
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std::wstring wstr(str_view.begin(), str_view.end());
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if (!remove_evil_keywords_from_string(&wstr[0], wstr.size()))
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{
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return false;
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}
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const std::string regular_str(wstr.begin(), wstr.end());
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memcpy(str, regular_str.data(), length);
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return true;
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}
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int WINAPI get_window_text_a_stub(const HWND wnd, const LPSTR str, const int max_count)
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{
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std::wstring wstr{};
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wstr.resize(max_count);
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const auto res = GetWindowTextW(wnd, &wstr[0], max_count);
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if (res)
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{
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remove_evil_keywords_from_string(wstr.data(), res);
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const std::string regular_str(wstr.begin(), wstr.end());
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memset(str, 0, max_count);
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memcpy(str, regular_str.data(), res);
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}
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return res;
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}
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NTSTATUS NTAPI nt_query_system_information_stub(const SYSTEM_INFORMATION_CLASS system_information_class,
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const PVOID system_information,
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const ULONG system_information_length,
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const PULONG return_length)
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{
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const auto status = nt_query_system_information_hook.invoke<NTSTATUS>(
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system_information_class, system_information, system_information_length, return_length);
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if (NT_SUCCESS(status))
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{
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if (system_information_class == SystemProcessInformation && !utils::nt::is_shutdown_in_progress())
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{
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bool injected_steam = false;
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auto addr = static_cast<uint8_t*>(system_information);
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while (true)
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{
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const auto info = reinterpret_cast<SYSTEM_PROCESS_INFORMATION*>(addr);
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remove_evil_keywords_from_string(info->ImageName);
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static const auto our_pid = process_id_to_handle(GetCurrentProcessId());
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if (!injected_steam && info->UniqueProcessId != our_pid)
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{
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static wchar_t steam_path[] = L"steam.exe";
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info->UniqueProcessId = process_id_to_handle(pseudo_steam_id);
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info->ImageName.Buffer = steam_path;
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info->ImageName.Length = static_cast<uint16_t>(wcslen(steam_path) * 2u);
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info->ImageName.MaximumLength = info->ImageName.Length;
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injected_steam = true;
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}
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if (!info->NextEntryOffset)
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{
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break;
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}
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addr = addr + info->NextEntryOffset;
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}
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}
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}
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return status;
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}
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bool handle_pseudo_steam_process(const HANDLE handle, const PROCESSINFOCLASS info_class,
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const PVOID info,
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const ULONG info_length, const PULONG ret_length, NTSTATUS* status)
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{
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if (handle != pseudo_steam_handle || static_cast<int>(info_class) != 43)
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{
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return false;
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}
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const auto steam_folder = steam::SteamAPI_GetSteamInstallPath();
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const auto steam_path = steam_folder + "\\steam.exe"s;
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const std::wstring wide_path(steam_path.begin(), steam_path.end());
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const auto required_size = static_cast<ULONG>((wide_path.size() + 1u) * 2u + sizeof(UNICODE_STRING));
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if (ret_length)
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{
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*ret_length = required_size;
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}
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if (info_length < required_size)
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{
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*status = static_cast<LONG>(0xC0000004);
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return true;
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}
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memset(info, 0, info_length);
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auto& str = *static_cast<UNICODE_STRING*>(info);
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str.Buffer = reinterpret_cast<wchar_t*>(&str + 1);
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str.Length = static_cast<uint16_t>(wide_path.size() * 2u);
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str.MaximumLength = str.Length;
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memcpy(str.Buffer, wide_path.data(), str.Length);
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*status = 0;
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return true;
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}
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NTSTATUS WINAPI nt_query_information_process_stub(const HANDLE handle, const PROCESSINFOCLASS info_class,
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const PVOID info,
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const ULONG info_length, const PULONG ret_length)
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{
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NTSTATUS status{0};
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if (handle_pseudo_steam_process(handle, info_class, info, info_length, ret_length, &status))
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{
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return status;
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}
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status = nt_query_information_process_hook.invoke<NTSTATUS>(handle, info_class, info, info_length,
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ret_length);
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if (NT_SUCCESS(status))
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{
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if (info_class == ProcessBasicInformation)
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{
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static_cast<PPROCESS_BASIC_INFORMATION>(info)->Reserved3 = process_id_to_handle(pseudo_steam_id);
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}
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else if (info_class == ProcessDebugObjectHandle)
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{
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*static_cast<HANDLE*>(info) = nullptr;
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return static_cast<LONG>(0xC0000353);
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}
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else if (info_class == ProcessImageFileName || static_cast<int>(info_class) == 43 /* ? */)
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{
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remove_evil_keywords_from_string(*static_cast<UNICODE_STRING*>(info));
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}
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else if (info_class == ProcessDebugPort)
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{
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*static_cast<HANDLE*>(info) = nullptr;
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}
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else if (info_class == ProcessDebugFlags)
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{
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*static_cast<ULONG*>(info) = 1;
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}
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}
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return status;
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}
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NTSTATUS NTAPI nt_close_stub(const HANDLE handle)
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{
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if (handle == pseudo_steam_handle)
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{
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return 0;
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}
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char info[16];
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if (NtQueryObject(handle, OBJECT_INFORMATION_CLASS(4), &info, 2, nullptr) >= 0 && size_t(handle) != 0x12345)
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{
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return nt_close_hook.invoke<NTSTATUS>(handle);
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}
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return STATUS_INVALID_HANDLE;
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}
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void hide_being_debugged()
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{
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auto* const peb = reinterpret_cast<PPEB>(__readgsqword(0x60));
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peb->BeingDebugged = false;
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*reinterpret_cast<PDWORD>(LPSTR(peb) + 0xBC) &= ~0x70;
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}
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void restore_debug_functions()
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{
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static const char* functions[] = {
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"DbgBreakPoint",
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"DbgUserBreakPoint",
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"DbgUiConnectToDbg",
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"DbgUiContinue",
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"DbgUiConvertStateChangeStructure",
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"DbgUiDebugActiveProcess",
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"DbgUiGetThreadDebugObject",
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"DbgUiIssueRemoteBreakin",
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"DbgUiRemoteBreakin",
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"DbgUiSetThreadDebugObject",
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"DbgUiStopDebugging",
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"DbgUiWaitStateChange",
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"DbgPrintReturnControlC",
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"DbgPrompt",
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};
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using buffer = uint8_t[15];
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static buffer buffers[ARRAYSIZE(functions)] = {};
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static bool loaded = false;
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const utils::nt::library ntdll("ntdll.dll");
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for (auto i = 0u; i < ARRAYSIZE(functions); ++i)
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{
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const auto func = ntdll.get_proc<void*>(functions[i]);
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if (!loaded)
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{
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memcpy(buffers[i], func, sizeof(buffer));
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}
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else
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{
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utils::hook::copy(func, buffers[i], sizeof(buffer));
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}
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}
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loaded = true;
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}
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struct integrity_handler_context
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{
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uint32_t* computed_checksum;
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uint32_t* original_checksum;
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};
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// Pretty trashy, but working, heuristic to search integrity the handler context
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bool is_handler_context(uint8_t* stack_frame, const uint32_t computed_checksum, const uint32_t frame_offset)
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{
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auto* potential_address = *reinterpret_cast<uint32_t**>(stack_frame + frame_offset);
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int64_t diff = reinterpret_cast<uint64_t>(stack_frame) - reinterpret_cast<uint64_t>(potential_address);
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diff = std::abs(diff);
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return diff < 0x1000 && *potential_address == computed_checksum;
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}
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integrity_handler_context* search_handler_context(uint8_t* stack_frame, const uint32_t computed_checksum)
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{
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for (uint32_t frame_offset = 0x38; frame_offset < 0x90; frame_offset += 8)
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{
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if (is_handler_context(stack_frame, computed_checksum, frame_offset))
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{
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return reinterpret_cast<integrity_handler_context*>(stack_frame + frame_offset);
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}
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}
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return nullptr;
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}
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uint32_t adjust_integrity_checksum(const uint64_t return_address, uint8_t* stack_frame,
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const uint32_t current_checksum)
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{
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const auto handler_address = reverse_g(return_address - 5);
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const auto* context = search_handler_context(stack_frame, current_checksum);
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if (!context)
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{
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MessageBoxA(nullptr, utils::string::va("No frame offset for: %llX", handler_address), "Error",
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MB_ICONERROR);
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TerminateProcess(GetCurrentProcess(), 0xBAD);
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return current_checksum;
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}
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const auto correct_checksum = *context->original_checksum;
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*context->computed_checksum = correct_checksum;
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if (current_checksum != correct_checksum)
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{
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#ifndef NDEBUG
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printf("Adjusting checksum (%llX): %X -> %X\n", handler_address,
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current_checksum, correct_checksum);
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#endif
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}
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return correct_checksum;
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}
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void patch_intact_basic_block_integrity_check(void* address)
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{
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const auto game_address = reinterpret_cast<uint64_t>(address);
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constexpr auto inst_len = 3;
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const auto next_inst_addr = game_address + inst_len;
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const auto next_inst = *reinterpret_cast<uint32_t*>(next_inst_addr);
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if ((next_inst & 0xFF00FFFF) != 0xFF004583)
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{
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throw std::runtime_error(utils::string::va("Unable to patch intact basic block: %llX", game_address));
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}
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const auto other_frame_offset = static_cast<uint8_t>(next_inst >> 16);
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static const auto stub = utils::hook::assemble([](utils::hook::assembler& a)
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{
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a.push(rax);
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a.mov(rax, qword_ptr(rsp, 8));
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a.sub(rax, 2); // Skip the push we inserted
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a.push(rax);
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a.pushad64();
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a.mov(r8, qword_ptr(rsp, 0x88));
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a.mov(rcx, rax);
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a.mov(rdx, rbp);
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a.call_aligned(adjust_integrity_checksum);
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a.mov(qword_ptr(rsp, 0x80), rax);
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a.popad64();
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a.pop(rax);
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a.add(rsp, 8);
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a.mov(dword_ptr(rdx, rcx, 4), eax);
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a.pop(rax); // return addr
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a.xchg(rax, qword_ptr(rsp)); // switch with push
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a.add(dword_ptr(rbp, rax), 0xFFFFFFFF);
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a.mov(rax, dword_ptr(rdx, rcx, 4)); // restore rax
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a.ret();
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});
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// push other_frame_offset
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utils::hook::set<uint16_t>(game_address, static_cast<uint16_t>(0x6A | (other_frame_offset << 8)));
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utils::hook::call(game_address + 2, stub);
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}
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void patch_split_basic_block_integrity_check(void* address)
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{
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const auto game_address = reinterpret_cast<uint64_t>(address);
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constexpr auto inst_len = 3;
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const auto next_inst_addr = game_address + inst_len;
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if (*reinterpret_cast<uint8_t*>(next_inst_addr) != 0xE9)
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{
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throw std::runtime_error(utils::string::va("Unable to patch split basic block: %llX", game_address));
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}
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const auto jump_target = utils::hook::extract<void*>(reinterpret_cast<void*>(next_inst_addr + 1));
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const auto stub = utils::hook::assemble([jump_target](utils::hook::assembler& a)
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{
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a.push(rax);
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a.mov(rax, qword_ptr(rsp, 8));
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a.push(rax);
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a.pushad64();
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a.mov(r8, qword_ptr(rsp, 0x88));
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a.mov(rcx, rax);
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a.mov(rdx, rbp);
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a.call_aligned(adjust_integrity_checksum);
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|
|
a.mov(qword_ptr(rsp, 0x80), rax);
|
|
|
|
a.popad64();
|
|
a.pop(rax);
|
|
|
|
a.add(rsp, 8);
|
|
|
|
a.mov(dword_ptr(rdx, rcx, 4), eax);
|
|
|
|
a.add(rsp, 8);
|
|
|
|
a.jmp(jump_target);
|
|
});
|
|
|
|
utils::hook::call(game_address, stub);
|
|
}
|
|
|
|
void search_and_patch_integrity_checks()
|
|
{
|
|
// There seem to be 1219 results.
|
|
// Searching them is quite slow.
|
|
// Maybe precomputing that might be better?
|
|
const auto intact_results = "89 04 8A 83 45 ? FF"_sig;
|
|
const auto split_results = "89 04 8A E9"_sig;
|
|
|
|
for (auto* i : intact_results)
|
|
{
|
|
patch_intact_basic_block_integrity_check(i);
|
|
}
|
|
|
|
for (auto* i : split_results)
|
|
{
|
|
patch_split_basic_block_integrity_check(i);
|
|
}
|
|
}
|
|
|
|
LONG WINAPI exception_filter(const LPEXCEPTION_POINTERS info)
|
|
{
|
|
if (info->ExceptionRecord->ExceptionCode == STATUS_INVALID_HANDLE)
|
|
{
|
|
return EXCEPTION_CONTINUE_EXECUTION;
|
|
}
|
|
|
|
return EXCEPTION_CONTINUE_SEARCH;
|
|
}
|
|
|
|
const char* get_command_line_a_stub()
|
|
{
|
|
static auto cmd = []
|
|
{
|
|
std::string cmd_line = GetCommandLineA();
|
|
if (!strstr(cmd_line.data(), "fs_game"))
|
|
{
|
|
cmd_line += " +set fs_game \"boiii\"";
|
|
}
|
|
|
|
return cmd_line;
|
|
}();
|
|
|
|
return cmd.data();
|
|
}
|
|
}
|
|
|
|
int WINAPI get_system_metrics_stub(const int index)
|
|
{
|
|
if (SM_REMOTESESSION == index)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
return GetSystemMetrics(index);
|
|
}
|
|
|
|
BOOL WINAPI get_thread_context_stub(const HANDLE thread_handle, const LPCONTEXT context)
|
|
{
|
|
constexpr auto debug_registers_flag = (CONTEXT_DEBUG_REGISTERS & ~CONTEXT_AMD64);
|
|
if (context->ContextFlags & debug_registers_flag)
|
|
{
|
|
auto* source = _ReturnAddress();
|
|
const auto game = utils::nt::library{};
|
|
const auto source_module = utils::nt::library::get_by_address(source);
|
|
|
|
if (source_module == game)
|
|
{
|
|
context->ContextFlags &= ~debug_registers_flag;
|
|
}
|
|
}
|
|
|
|
return get_thread_context_hook.invoke<BOOL>(thread_handle, context);
|
|
}
|
|
|
|
NTSTATUS NTAPI get_proc_address_stub(const HMODULE module_handle, const PANSI_STRING function_name,
|
|
const WORD oridinal,
|
|
PVOID* function_address, const BOOL b_value,
|
|
PVOID* callback_address)
|
|
{
|
|
OutputDebugStringA(utils::string::va("Proc: %s %X\n",
|
|
(function_name && function_name->Buffer)
|
|
? function_name->Buffer
|
|
: "(null)", static_cast<DWORD>(oridinal)));
|
|
|
|
return get_proc_address_hook.invoke<NTSTATUS>(module_handle, function_name, oridinal, function_address, b_value,
|
|
callback_address);
|
|
}
|
|
|
|
NTSTATUS zw_terminate_process_stub(const HANDLE process_handle, const NTSTATUS exit_status)
|
|
{
|
|
MessageBoxA(nullptr, "TERMINATING", nullptr, 0);
|
|
return zw_terminate_process_hook.invoke<NTSTATUS>(process_handle, exit_status);
|
|
}
|
|
|
|
class component final : public component_interface
|
|
{
|
|
public:
|
|
component()
|
|
{
|
|
auto* dll_characteristics = &utils::nt::library().get_optional_header()->DllCharacteristics;
|
|
utils::hook::set<WORD>(dll_characteristics, *dll_characteristics | IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE);
|
|
}
|
|
|
|
void pre_start() override
|
|
{
|
|
disable_tls_callbacks();
|
|
restore_debug_functions();
|
|
|
|
hide_being_debugged();
|
|
scheduler::loop(hide_being_debugged, scheduler::pipeline::async);
|
|
|
|
create_thread_hook.create(CreateThread, create_thread_stub);
|
|
create_mutex_ex_a_hook.create(CreateMutexExA, create_mutex_ex_a_stub);
|
|
|
|
const utils::nt::library ntdll("ntdll.dll");
|
|
nt_close_hook.create(ntdll.get_proc<void*>("NtClose"), nt_close_stub);
|
|
|
|
const auto nt_query_information_process = ntdll.get_proc<void*>("NtQueryInformationProcess");
|
|
nt_query_information_process_hook.create(nt_query_information_process,
|
|
nt_query_information_process_stub);
|
|
|
|
const auto nt_query_system_information = ntdll.get_proc<void*>("NtQuerySystemInformation");
|
|
nt_query_system_information_hook.create(nt_query_system_information, nt_query_system_information_stub);
|
|
nt_query_system_information_hook.move();
|
|
|
|
open_process_hook.create(OpenProcess, open_process_stub);
|
|
|
|
#ifndef NDEBUG
|
|
auto* get_thread_context_func = utils::nt::library("kernelbase.dll").get_proc<void*>("GetThreadContext");
|
|
get_thread_context_hook.create(get_thread_context_func, get_thread_context_stub);
|
|
#endif
|
|
|
|
utils::hook::copy(this->window_text_buffer_, GetWindowTextA, sizeof(this->window_text_buffer_));
|
|
utils::hook::jump(GetWindowTextA, get_window_text_a_stub, true, true);
|
|
utils::hook::move_hook(GetWindowTextA);
|
|
|
|
AddVectoredExceptionHandler(1, exception_filter);
|
|
|
|
auto* sys_met_import = utils::nt::library{}.get_iat_entry("user32.dll", "GetSystemMetrics");
|
|
if (sys_met_import) utils::hook::set(sys_met_import, get_system_metrics_stub);
|
|
|
|
// TODO: Remove as soon as real hooking works
|
|
auto* get_cmd_import = utils::nt::library{}.get_iat_entry("kernel32.dll", "GetCommandLineA");
|
|
if (get_cmd_import) utils::hook::set(get_cmd_import, get_command_line_a_stub);
|
|
|
|
//zw_terminate_process_hook.create(ntdll.get_proc<void*>("ZwTerminateProcess"), zw_terminate_process_stub);
|
|
//zw_terminate_process_hook.move();
|
|
|
|
//auto* gpafc = ntdll.get_proc<void*>("LdrGetProcedureAddressForCaller");
|
|
//get_proc_address_hook.create(gpafc, get_proc_address_stub);
|
|
//get_proc_address_hook.move();
|
|
}
|
|
|
|
void post_unpack() override
|
|
{
|
|
search_and_patch_integrity_checks();
|
|
//restore_debug_functions();
|
|
}
|
|
|
|
int priority() override
|
|
{
|
|
return 9999;
|
|
}
|
|
|
|
private:
|
|
uint8_t window_text_buffer_[15]{};
|
|
};
|
|
}
|
|
|
|
REGISTER_COMPONENT(arxan::component)
|