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/* $Id$ */
/** @file
* VBoxGINA - Windows Logon DLL for VirtualBox, Helper Functions.
*/
/*
* Copyright (C) 2006-2022 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
#include <iprt/win/windows.h>
#include <iprt/semaphore.h>
#include <iprt/string.h>
#include <iprt/thread.h>
#include "winwlx.h"
#include "Helper.h"
#include "VBoxGINA.h"
#include <VBox/log.h>
#include <VBox/VBoxGuestLib.h>
/** Flag indicating whether remote sessions (over MSRDP) should be
* handled or not. Default is disabled. */
static DWORD g_dwHandleRemoteSessions = 0;
/** Verbosity flag for guest logging. */
static DWORD g_dwVerbosity = 0;
/**
* Displays a verbose message.
*
* @param dwLevel Minimum log level required to display this message.
* @param pszFormat The message text.
* @param ... Format arguments.
*/
void VBoxGINAVerbose(DWORD dwLevel, const char *pszFormat, ...)
{
if (dwLevel <= g_dwVerbosity)
{
va_list args;
va_start(args, pszFormat);
char *psz = NULL;
RTStrAPrintfV(&psz, pszFormat, args);
va_end(args);
AssertPtr(psz);
LogRel(("%s", psz));
RTStrFree(psz);
}
}
/**
* Loads the global configuration from registry.
*
* @return IPRT status code.
*/
int VBoxGINALoadConfiguration(void)
{
HKEY hKey;
/** @todo Add some registry wrapper function(s) as soon as we got more values to retrieve. */
DWORD dwRet = RegOpenKeyEx(HKEY_LOCAL_MACHINE, L"SOFTWARE\\Oracle\\VirtualBox Guest Additions\\AutoLogon",
0L, KEY_QUERY_VALUE, &hKey);
if (dwRet == ERROR_SUCCESS)
{
DWORD dwValue;
DWORD dwType = REG_DWORD;
DWORD dwSize = sizeof(DWORD);
dwRet = RegQueryValueEx(hKey, L"HandleRemoteSessions", NULL, &dwType, (LPBYTE)&dwValue, &dwSize);
if ( dwRet == ERROR_SUCCESS
&& dwType == REG_DWORD
&& dwSize == sizeof(DWORD))
{
g_dwHandleRemoteSessions = dwValue;
}
dwRet = RegQueryValueEx(hKey, L"LoggingEnabled", NULL, &dwType, (LPBYTE)&dwValue, &dwSize);
if ( dwRet == ERROR_SUCCESS
&& dwType == REG_DWORD
&& dwSize == sizeof(DWORD))
{
g_dwVerbosity = 1; /* Default logging level. */
}
if (g_dwVerbosity) /* Do we want logging at all? */
{
dwRet = RegQueryValueEx(hKey, L"LoggingLevel", NULL, &dwType, (LPBYTE)&dwValue, &dwSize);
if ( dwRet == ERROR_SUCCESS
&& dwType == REG_DWORD
&& dwSize == sizeof(DWORD))
{
g_dwVerbosity = dwValue;
}
}
RegCloseKey(hKey);
}
/* Do not report back an error here yet. */
return VINF_SUCCESS;
}
/**
* Determines whether we should handle the current session or not.
*
* @return bool true if we should handle this session, false if not.
*/
bool VBoxGINAHandleCurrentSession(void)
{
/* Load global configuration from registry. */
int rc = VBoxGINALoadConfiguration();
if (RT_FAILURE(rc))
VBoxGINAVerbose(0, "VBoxGINA::handleCurrentSession: Error loading global configuration, rc=%Rrc\n",
rc);
bool fHandle = false;
if (VbglR3AutoLogonIsRemoteSession())
{
if (g_dwHandleRemoteSessions) /* Force remote session handling. */
fHandle = true;
}
else /* No remote session. */
fHandle = true;
#ifdef DEBUG
VBoxGINAVerbose(3, "VBoxGINA::handleCurrentSession: Handling current session=%RTbool\n", fHandle);
#endif
return fHandle;
}
/* handle of the poller thread */
RTTHREAD gThreadPoller = NIL_RTTHREAD;
/**
* Poller thread. Checks periodically whether there are credentials.
*/
static DECLCALLBACK(int) credentialsPoller(RTTHREAD ThreadSelf, void *pvUser)
{
RT_NOREF(pvUser);
VBoxGINAVerbose(0, "VBoxGINA::credentialsPoller\n");
do
{
int rc = VbglR3CredentialsQueryAvailability();
if (RT_SUCCESS(rc))
{
VBoxGINAVerbose(0, "VBoxGINA::credentialsPoller: got credentials, simulating C-A-D\n");
/* tell WinLogon to start the attestation process */
pWlxFuncs->WlxSasNotify(hGinaWlx, WLX_SAS_TYPE_CTRL_ALT_DEL);
/* time to say goodbye */
return 0;
}
if ( RT_FAILURE(rc)
&& rc != VERR_NOT_FOUND)
{
static int s_cBitchedQueryAvail = 0;
if (s_cBitchedQueryAvail++ < 5)
VBoxGINAVerbose(0, "VBoxGINA::credentialsPoller: querying for credentials failed with rc=%Rrc\n", rc);
}
/* wait a bit */
if (RTThreadUserWait(ThreadSelf, 500) == VINF_SUCCESS)
{
VBoxGINAVerbose(0, "VBoxGINA::credentialsPoller: we were asked to terminate\n");
/* we were asked to terminate, do that instantly! */
return 0;
}
}
while (1);
return 0;
}
int VBoxGINACredentialsPollerCreate(void)
{
if (!VBoxGINAHandleCurrentSession())
return VINF_SUCCESS;
VBoxGINAVerbose(0, "VBoxGINA::credentialsPollerCreate\n");
/* don't create more than one of them */
if (gThreadPoller != NIL_RTTHREAD)
{
VBoxGINAVerbose(0, "VBoxGINA::credentialsPollerCreate: thread already running, returning!\n");
return VINF_SUCCESS;
}
/* create the poller thread */
int rc = RTThreadCreate(&gThreadPoller, credentialsPoller, NULL, 0, RTTHREADTYPE_INFREQUENT_POLLER,
RTTHREADFLAGS_WAITABLE, "creds");
if (RT_FAILURE(rc))
VBoxGINAVerbose(0, "VBoxGINA::credentialsPollerCreate: failed to create thread, rc = %Rrc\n", rc);
return rc;
}
int VBoxGINACredentialsPollerTerminate(void)
{
if (gThreadPoller == NIL_RTTHREAD)
return VINF_SUCCESS;
VBoxGINAVerbose(0, "VBoxGINA::credentialsPollerTerminate\n");
/* post termination event semaphore */
int rc = RTThreadUserSignal(gThreadPoller);
if (RT_SUCCESS(rc))
{
VBoxGINAVerbose(0, "VBoxGINA::credentialsPollerTerminate: waiting for thread to terminate\n");
rc = RTThreadWait(gThreadPoller, RT_INDEFINITE_WAIT, NULL);
}
else
VBoxGINAVerbose(0, "VBoxGINA::credentialsPollerTerminate: thread has terminated? wait rc = %Rrc\n", rc);
if (RT_SUCCESS(rc))
{
gThreadPoller = NIL_RTTHREAD;
}
VBoxGINAVerbose(0, "VBoxGINA::credentialsPollerTerminate: returned with rc=%Rrc)\n", rc);
return rc;
}
/**
* Reports VBoxGINA's status to the host (treated as a guest facility).
*
* @return IPRT status code.
* @param enmStatus Status to report to the host.
*/
int VBoxGINAReportStatus(VBoxGuestFacilityStatus enmStatus)
{
VBoxGINAVerbose(0, "VBoxGINA: reporting status %d\n", enmStatus);
int rc = VbglR3AutoLogonReportStatus(enmStatus);
if (RT_FAILURE(rc))
VBoxGINAVerbose(0, "VBoxGINA: failed to report status %d, rc=%Rrc\n", enmStatus, rc);
return rc;
}
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