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#include <stdafx.h>
#include "update.h"
#include <libcommon/error.h>
#include <libcommon/filesystem.h>
#include <libcommon/memory.h>
#include <algorithm>
#include <fstream>
#include <filesystem>
namespace
{
// Jason found this to be a reliable marker of the signature check fix:
// https://git.zx2c4.com/wireguard-windows/tree/installer/customactions.c#n145
const char PATCH_MARKER[] = "Signature Hash";
}
namespace update
{
bool HasSetupApiSha2Fix()
{
common::memory::ScopeDestructor destructor;
common::fs::ScopedNativeFileSystem nativeFileSystem;
const auto systemDir = common::fs::GetKnownFolderPath(FOLDERID_System, KF_FLAG_DEFAULT, NULL);
const auto setupApiPath = std::filesystem::path(systemDir).append(L"setupapi.dll");
const auto setupApiHandle = CreateFileW(
setupApiPath.c_str(),
GENERIC_READ,
FILE_SHARE_READ,
nullptr,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
nullptr
);
if (INVALID_HANDLE_VALUE == setupApiHandle)
{
THROW_WINDOWS_ERROR(GetLastError(), "CreateFileW");
}
destructor += [=]() {
CloseHandle(setupApiHandle);
};
const auto mapping = CreateFileMappingW(setupApiHandle, nullptr, PAGE_READONLY, 0, 0, nullptr);
if (nullptr == mapping)
{
THROW_WINDOWS_ERROR(GetLastError(), "CreateFileMappingW");
}
destructor += [=]() {
CloseHandle(mapping);
};
const auto bytes = MapViewOfFile(mapping, FILE_MAP_READ, 0, 0, 0);
if (nullptr == bytes)
{
THROW_WINDOWS_ERROR(GetLastError(), "MapViewOfFile");
}
destructor += [=]() {
UnmapViewOfFile(bytes);
};
MEMORY_BASIC_INFORMATION meminfo;
if (0 == VirtualQuery(bytes, &meminfo, sizeof(meminfo)))
{
THROW_WINDOWS_ERROR(GetLastError(), "VirtualQuery");
}
constexpr auto PATCH_MARKER_SIZE = sizeof(PATCH_MARKER) - 1;
if (meminfo.RegionSize < PATCH_MARKER_SIZE)
{
return false;
}
for (size_t i = 0; i <= meminfo.RegionSize - PATCH_MARKER_SIZE; i++)
{
if (0 == memcmp((void*)((char*)bytes + i), PATCH_MARKER, PATCH_MARKER_SIZE))
{
return true;
}
}
return false;
}
}
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