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// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
#include "precomp.h"
OS_VERSION vOsVersion = OS_VERSION_UNKNOWN;
DWORD vdwOsServicePack = 0;
/********************************************************************
OsGetVersion
********************************************************************/
extern "C" void DAPI OsGetVersion(
__out OS_VERSION* pVersion,
__out DWORD* pdwServicePack
)
{
OSVERSIONINFOEXW ovi = { };
if (OS_VERSION_UNKNOWN == vOsVersion)
{
ovi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEXW);
::GetVersionExW(reinterpret_cast<OSVERSIONINFOW*>(&ovi)); // only fails if version info size is set incorrectly.
vdwOsServicePack = static_cast<DWORD>(ovi.wServicePackMajor) << 16 | ovi.wServicePackMinor;
if (4 == ovi.dwMajorVersion)
{
vOsVersion = OS_VERSION_WINNT;
}
else if (5 == ovi.dwMajorVersion)
{
if (0 == ovi.dwMinorVersion)
{
vOsVersion = OS_VERSION_WIN2000;
}
else if (1 == ovi.dwMinorVersion)
{
vOsVersion = OS_VERSION_WINXP;
}
else if (2 == ovi.dwMinorVersion)
{
vOsVersion = OS_VERSION_WIN2003;
}
else
{
vOsVersion = OS_VERSION_FUTURE;
}
}
else if (6 == ovi.dwMajorVersion)
{
if (0 == ovi.dwMinorVersion)
{
vOsVersion = (VER_NT_WORKSTATION == ovi.wProductType) ? OS_VERSION_VISTA : OS_VERSION_WIN2008;
}
else if (1 == ovi.dwMinorVersion)
{
vOsVersion = (VER_NT_WORKSTATION == ovi.wProductType) ? OS_VERSION_WIN7 : OS_VERSION_WIN2008_R2;
}
else
{
vOsVersion = OS_VERSION_FUTURE;
}
}
else
{
vOsVersion = OS_VERSION_FUTURE;
}
}
*pVersion = vOsVersion;
*pdwServicePack = vdwOsServicePack;
}
extern "C" HRESULT DAPI OsCouldRunPrivileged(
__out BOOL* pfPrivileged
)
{
HRESULT hr = S_OK;
BOOL fUacEnabled = FALSE;
SID_IDENTIFIER_AUTHORITY NtAuthority = SECURITY_NT_AUTHORITY;
PSID AdministratorsGroup = NULL;
// Do a best effort check to see if UAC is enabled on this machine.
OsIsUacEnabled(&fUacEnabled);
// If UAC is enabled then the process could run privileged by asking to elevate.
if (fUacEnabled)
{
*pfPrivileged = TRUE;
}
else // no UAC so only privilged if user is in administrators group.
{
*pfPrivileged = ::AllocateAndInitializeSid(&NtAuthority, 2, SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0, &AdministratorsGroup);
if (*pfPrivileged)
{
if (!::CheckTokenMembership(NULL, AdministratorsGroup, pfPrivileged))
{
*pfPrivileged = FALSE;
}
}
}
ReleaseSid(AdministratorsGroup);
return hr;
}
extern "C" HRESULT DAPI OsIsRunningPrivileged(
__out BOOL* pfPrivileged
)
{
HRESULT hr = S_OK;
UINT er = ERROR_SUCCESS;
HANDLE hToken = NULL;
TOKEN_ELEVATION_TYPE elevationType = TokenElevationTypeDefault;
DWORD dwSize = 0;
SID_IDENTIFIER_AUTHORITY NtAuthority = SECURITY_NT_AUTHORITY;
PSID AdministratorsGroup = NULL;
if (!::OpenProcessToken(::GetCurrentProcess(), TOKEN_QUERY, &hToken))
{
ExitOnLastError(hr, "Failed to open process token.");
}
if (::GetTokenInformation(hToken, TokenElevationType, &elevationType, sizeof(TOKEN_ELEVATION_TYPE), &dwSize))
{
*pfPrivileged = (TokenElevationTypeFull == elevationType);
ExitFunction1(hr = S_OK);
}
// If it's invalid argument, this means they don't support TokenElevationType, and we should fallback to another check
er = ::GetLastError();
if (ERROR_INVALID_FUNCTION == er)
{
er = ERROR_SUCCESS;
}
ExitOnWin32Error(er, hr, "Failed to get process token information.");
// Fallback to this check for some OS's (like XP)
*pfPrivileged = ::AllocateAndInitializeSid(&NtAuthority, 2, SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0, &AdministratorsGroup);
if (*pfPrivileged)
{
if (!::CheckTokenMembership(NULL, AdministratorsGroup, pfPrivileged))
{
*pfPrivileged = FALSE;
}
}
LExit:
ReleaseSid(AdministratorsGroup);
if (hToken)
{
::CloseHandle(hToken);
}
return hr;
}
extern "C" HRESULT DAPI OsIsUacEnabled(
__out BOOL* pfUacEnabled
)
{
HRESULT hr = S_OK;
HKEY hk = NULL;
DWORD dwUacEnabled = 0;
*pfUacEnabled = FALSE; // assume UAC not enabled.
hr = RegOpen(HKEY_LOCAL_MACHINE, L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System", KEY_READ, &hk);
if (E_FILENOTFOUND == hr)
{
ExitFunction1(hr = S_OK);
}
ExitOnFailure(hr, "Failed to open system policy key to detect UAC.");
hr = RegReadNumber(hk, L"EnableLUA", &dwUacEnabled);
if (E_FILENOTFOUND == hr)
{
ExitFunction1(hr = S_OK);
}
ExitOnFailure(hr, "Failed to read registry value to detect UAC.");
*pfUacEnabled = (0 != dwUacEnabled);
LExit:
ReleaseRegKey(hk);
return hr;
}
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