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HMDM/HMDM-VDM/vdm_ctx/vdm_ctx.hpp

71 lines
1.9 KiB

4 years ago
#pragma once
#include <windows.h>
#include <string_view>
#include <vector>
#include <thread>
#include <atomic>
#include <mutex>
#include <functional>
#include "../vdm/vdm.hpp"
namespace vdm
{
// change this to whatever you want :^)
constexpr std::pair<const char*, const char*> syscall_hook = { "NtShutdownSystem", "ntdll.dll" };
inline std::atomic<bool> is_page_found = false;
inline std::atomic<void*> syscall_address = nullptr;
inline std::uint16_t nt_page_offset;
inline std::uint32_t nt_rva;
inline std::uint8_t* ntoskrnl;
using read_phys_t = std::function<decltype(vdm::read_phys)>;
using write_phys_t = std::function<decltype(vdm::write_phys)>;
class vdm_ctx
{
public:
explicit vdm_ctx(read_phys_t& read_func, write_phys_t& write_func);
void set_read(read_phys_t& read_func);
void set_write(write_phys_t& write_func);
template <class T, class ... Ts>
__forceinline std::invoke_result_t<T, Ts ...> syscall(void* addr, Ts ... args) const
{
static const auto proc =
GetProcAddress(
LoadLibraryA(syscall_hook.second),
syscall_hook.first
);
static std::mutex syscall_mutex;
syscall_mutex.lock();
// jmp [rip+0x0]
std::uint8_t jmp_code[] =
{
0xff, 0x25, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00
};
std::uint8_t orig_bytes[sizeof jmp_code];
*reinterpret_cast<void**>(jmp_code + 6) = addr;
read_phys(vdm::syscall_address.load(), orig_bytes, sizeof orig_bytes);
// execute hook...
write_phys(vdm::syscall_address.load(), jmp_code, sizeof jmp_code);
auto result = reinterpret_cast<T>(proc)(args ...);
write_phys(vdm::syscall_address.load(), orig_bytes, sizeof orig_bytes);
syscall_mutex.unlock();
return result;
}
private:
void locate_syscall(std::uintptr_t begin, std::uintptr_t end) const;
bool valid_syscall(void* syscall_addr) const;
read_phys_t read_phys;
write_phys_t write_phys;
};
}