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/* $Id: RTSystemFirmware-win.cpp $ */
/** @file
* IPRT - System firmware information, Win32.
*/
/*
* Copyright (C) 2019-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "internal/iprt.h"
#include <iprt/system.h>
#include <iprt/nt/nt-and-windows.h>
#include <WinSDKVer.h>
#include <iprt/asm.h>
#include <iprt/assert.h>
#include <iprt/err.h>
#include <iprt/mem.h>
#include <iprt/ldr.h>
#include <iprt/string.h>
#include <iprt/utf16.h>
#include "internal-r3-win.h"
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
#if _WIN32_MAXVER < 0x0602 /* Windows 7 or older, supply missing GetFirmwareType bits. */
typedef enum _FIRMWARE_TYPE
{
FirmwareTypeUnknown,
FirmwareTypeBios,
FirmwareTypeUefi,
FirmwareTypeMax
} FIRMWARE_TYPE;
typedef FIRMWARE_TYPE *PFIRMWARE_TYPE;
WINBASEAPI BOOL WINAPI GetFirmwareType(PFIRMWARE_TYPE);
#endif
/*********************************************************************************************************************************
* Defined Constants And Macros *
*********************************************************************************************************************************/
/** Defines the UEFI Globals UUID. */
#define VBOX_UEFI_UUID_GLOBALS L"{8BE4DF61-93CA-11D2-AA0D-00E098032B8C}"
/** Defines an UEFI dummy UUID, see MSDN docs of the API. */
#define VBOX_UEFI_UUID_DUMMY L"{00000000-0000-0000-0000-000000000000}"
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
static volatile bool g_fResolvedApis = false;
static decltype(GetFirmwareType) *g_pfnGetFirmwareType;
static decltype(GetFirmwareEnvironmentVariableW) *g_pfnGetFirmwareEnvironmentVariableW;
static void rtSystemFirmwareResolveApis(void)
{
FARPROC pfnTmp1 = GetProcAddress(g_hModKernel32, "GetFirmwareType");
FARPROC pfnTmp2 = GetProcAddress(g_hModKernel32, "GetFirmwareEnvironmentVariableW");
ASMCompilerBarrier(); /* paranoia^2 */
g_pfnGetFirmwareType = (decltype(GetFirmwareType) *)pfnTmp1;
g_pfnGetFirmwareEnvironmentVariableW = (decltype(GetFirmwareEnvironmentVariableW) *)pfnTmp2;
ASMAtomicWriteBool(&g_fResolvedApis, true);
}
static int rtSystemFirmwareGetPrivileges(LPCTSTR pcszPrivilege)
{
HANDLE hToken;
BOOL fRc = OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken);
if (!fRc)
return RTErrConvertFromWin32(GetLastError());
int rc = VINF_SUCCESS;
TOKEN_PRIVILEGES tokenPriv;
fRc = LookupPrivilegeValue(NULL, pcszPrivilege, &tokenPriv.Privileges[0].Luid);
if (fRc)
{
tokenPriv.PrivilegeCount = 1;
tokenPriv.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
fRc = AdjustTokenPrivileges(hToken, FALSE, &tokenPriv, 0, (PTOKEN_PRIVILEGES)NULL, 0);
if (!fRc)
rc = RTErrConvertFromWin32(GetLastError());
}
else
rc = RTErrConvertFromWin32(GetLastError());
CloseHandle(hToken);
return rc;
}
RTDECL(int) RTSystemQueryFirmwareType(PRTSYSFWTYPE penmFirmwareType)
{
AssertPtrReturn(penmFirmwareType, VERR_INVALID_POINTER);
if (!g_fResolvedApis)
rtSystemFirmwareResolveApis();
*penmFirmwareType = RTSYSFWTYPE_INVALID;
int rc = VERR_NOT_SUPPORTED;
/* GetFirmwareType is Windows 8 and later. */
if (g_pfnGetFirmwareType)
{
FIRMWARE_TYPE enmWinFwType;
if (g_pfnGetFirmwareType(&enmWinFwType))
{
switch (enmWinFwType)
{
case FirmwareTypeBios:
*penmFirmwareType = RTSYSFWTYPE_BIOS;
break;
case FirmwareTypeUefi:
*penmFirmwareType = RTSYSFWTYPE_UEFI;
break;
default:
*penmFirmwareType = RTSYSFWTYPE_UNKNOWN;
AssertMsgFailed(("%d\n", enmWinFwType));
break;
}
rc = VINF_SUCCESS;
}
else
rc = RTErrConvertFromWin32(GetLastError());
}
/* GetFirmwareEnvironmentVariableW is XP and later. */
else if (g_pfnGetFirmwareEnvironmentVariableW)
{
rtSystemFirmwareGetPrivileges(SE_SYSTEM_ENVIRONMENT_NAME);
/* On a non-UEFI system (or such a system in legacy boot mode), we will get
back ERROR_INVALID_FUNCTION when querying any firmware variable. While on a
UEFI system we'll typically get ERROR_ACCESS_DENIED or similar as the dummy
is a non-exising dummy namespace. See the API docs. */
SetLastError(0);
uint8_t abWhatever[64];
DWORD cbRet = g_pfnGetFirmwareEnvironmentVariableW(L"", VBOX_UEFI_UUID_DUMMY, abWhatever, sizeof(abWhatever));
DWORD dwErr = GetLastError();
*penmFirmwareType = cbRet != 0 || dwErr != ERROR_INVALID_FUNCTION ? RTSYSFWTYPE_UEFI : RTSYSFWTYPE_BIOS;
rc = VINF_SUCCESS;
}
return rc;
}
RTDECL(int) RTSystemQueryFirmwareBoolean(RTSYSFWBOOL enmBoolean, bool *pfValue)
{
*pfValue = false;
/*
* Translate the enmBoolean to a name:
*/
const wchar_t *pwszName = NULL;
switch (enmBoolean)
{
case RTSYSFWBOOL_SECURE_BOOT:
pwszName = L"SecureBoot";
break;
default:
AssertReturn(enmBoolean > RTSYSFWBOOL_INVALID && enmBoolean < RTSYSFWBOOL_END, VERR_INVALID_PARAMETER);
return VERR_SYS_UNSUPPORTED_FIRMWARE_PROPERTY;
}
/*
* Do the query.
* Note! This will typically fail with access denied unless we're in an elevated process.
*/
if (!g_pfnGetFirmwareEnvironmentVariableW)
return VERR_NOT_SUPPORTED;
rtSystemFirmwareGetPrivileges(SE_SYSTEM_ENVIRONMENT_NAME);
uint8_t bValue = 0;
DWORD cbRet = g_pfnGetFirmwareEnvironmentVariableW(pwszName, VBOX_UEFI_UUID_GLOBALS, &bValue, sizeof(bValue));
*pfValue = cbRet != 0 && bValue != 0;
if (cbRet != 0)
return VINF_SUCCESS;
DWORD dwErr = GetLastError();
if ( dwErr == ERROR_INVALID_FUNCTION
|| dwErr == ERROR_ENVVAR_NOT_FOUND)
return VINF_SUCCESS;
return RTErrConvertFromWin32(dwErr);
}
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