base/system/winlogon/sas.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS Winlogon
   4  * FILE:            base/system/winlogon/sas.c
   5  * PURPOSE:         Secure Attention Sequence
   6  * PROGRAMMERS:     Thomas Weidenmueller (w3seek@users.sourceforge.net)
   7  *                  Hervé Poussineau (hpoussin@reactos.org)
   8  * UPDATE HISTORY:
   9  *                  Created 28/03/2004
  10  */
  11
  12 /* INCLUDES *****************************************************************/
  13
  14 #include "winlogon.h"
  15
  16 #define WIN32_LEAN_AND_MEAN
  17 #include <aclapi.h>
  18 #include <mmsystem.h>
  19 #include <userenv.h>
  20 #include <ndk/setypes.h>
  21 #include <ndk/sefuncs.h>
  22 #include <reactos/winlogon.h>
  23
  24 /* GLOBALS ******************************************************************/
  25
  26 #define WINLOGON_SAS_CLASS L"SAS Window class"
  27 #define WINLOGON_SAS_TITLE L"SAS window"
  28
  29 #define HK_CTRL_ALT_DEL   0
  30 #define HK_CTRL_SHIFT_ESC 1
  31
  32 #define EWX_ACTION_MASK 0xffffffeb
  33 #define EWX_FLAGS_MASK  0x00000014
  34
  35 typedef struct tagLOGOFF_SHUTDOWN_DATA
  36 {
  37     UINT Flags;
  38     PWLSESSION Session;
  39 } LOGOFF_SHUTDOWN_DATA, *PLOGOFF_SHUTDOWN_DATA;
  40
  41 /* FUNCTIONS ****************************************************************/
  42
  43 static BOOL
  44 StartTaskManager(
  45     IN OUT PWLSESSION Session)
  46 {
  47     LPVOID lpEnvironment;
  48     BOOL ret;
  49
  50     if (!Session->Gina.Functions.WlxStartApplication)
  51         return FALSE;
  52
  53     if (!CreateEnvironmentBlock(
  54         &lpEnvironment,
  55         Session->UserToken,
  56         TRUE))
  57     {
  58         return FALSE;
  59     }
  60
  61     ret = Session->Gina.Functions.WlxStartApplication(
  62         Session->Gina.Context,
  63         L"Default",
  64         lpEnvironment,
  65         L"taskmgr.exe");
  66
  67     DestroyEnvironmentBlock(lpEnvironment);
  68     return ret;
  69 }
  70
  71 static BOOL
  72 StartUserShell(
  73     IN OUT PWLSESSION Session)
  74 {
  75     LPVOID lpEnvironment = NULL;
  76     BOOLEAN Old;
  77     BOOL ret;
  78
  79     /* Create environment block for the user */
  80     if (!CreateEnvironmentBlock(&lpEnvironment, Session->UserToken, TRUE))
  81     {
  82         WARN("WL: CreateEnvironmentBlock() failed\n");
  83         return FALSE;
  84     }
  85
  86     /* Get privilege */
  87     /* FIXME: who should do it? winlogon or gina? */
  88     /* FIXME: reverting to lower privileges after creating user shell? */
  89     RtlAdjustPrivilege(SE_ASSIGNPRIMARYTOKEN_PRIVILEGE, TRUE, FALSE, &Old);
  90
  91     ret = Session->Gina.Functions.WlxActivateUserShell(
  92                 Session->Gina.Context,
  93                 L"Default",
  94                 NULL, /* FIXME */
  95                 lpEnvironment);
  96
  97     DestroyEnvironmentBlock(lpEnvironment);
  98     return ret;
  99 }
 100
 101
 102 BOOL
 103 SetDefaultLanguage(
 104     IN BOOL UserProfile)
 105 {
 106     HKEY BaseKey;
 107     LPCWSTR SubKey;
 108     LPCWSTR ValueName;
 109     LONG rc;
 110     HKEY hKey = NULL;
 111     DWORD dwType, dwSize;
 112     LPWSTR Value = NULL;
 113     UNICODE_STRING ValueString;
 114     NTSTATUS Status;
 115     LCID Lcid;
 116     BOOL ret = FALSE;
 117
 118     if (UserProfile)
 119     {
 120         BaseKey = HKEY_CURRENT_USER;
 121         SubKey = L"Control Panel\\International";
 122         ValueName = L"Locale";
 123     }
 124     else
 125     {
 126         BaseKey = HKEY_LOCAL_MACHINE;
 127         SubKey = L"System\\CurrentControlSet\\Control\\Nls\\Language";
 128         ValueName = L"Default";
 129     }
 130
 131     rc = RegOpenKeyExW(
 132         BaseKey,
 133         SubKey,
 134         0,
 135         KEY_READ,
 136         &hKey);
 137     if (rc != ERROR_SUCCESS)
 138     {
 139         TRACE("RegOpenKeyEx() failed with error %lu\n", rc);
 140         goto cleanup;
 141     }
 142     rc = RegQueryValueExW(
 143         hKey,
 144         ValueName,
 145         NULL,
 146         &dwType,
 147         NULL,
 148         &dwSize);
 149     if (rc != ERROR_SUCCESS)
 150     {
 151         TRACE("RegQueryValueEx() failed with error %lu\n", rc);
 152         goto cleanup;
 153     }
 154     else if (dwType != REG_SZ)
 155     {
 156         TRACE("Wrong type for %S\\%S registry entry (got 0x%lx, expected 0x%x)\n",
 157             SubKey, ValueName, dwType, REG_SZ);
 158         goto cleanup;
 159     }
 160
 161     Value = HeapAlloc(GetProcessHeap(), 0, dwSize);
 162     if (!Value)
 163     {
 164         TRACE("HeapAlloc() failed\n");
 165         goto cleanup;
 166     }
 167     rc = RegQueryValueExW(
 168         hKey,
 169         ValueName,
 170         NULL,
 171         NULL,
 172         (LPBYTE)Value,
 173         &dwSize);
 174     if (rc != ERROR_SUCCESS)
 175     {
 176         TRACE("RegQueryValueEx() failed with error %lu\n", rc);
 177         goto cleanup;
 178     }
 179
 180     /* Convert Value to a Lcid */
 181     ValueString.Length = ValueString.MaximumLength = (USHORT)dwSize;
 182     ValueString.Buffer = Value;
 183     Status = RtlUnicodeStringToInteger(&ValueString, 16, (PULONG)&Lcid);
 184     if (!NT_SUCCESS(Status))
 185     {
 186         TRACE("RtlUnicodeStringToInteger() failed with status 0x%08lx\n", Status);
 187         goto cleanup;
 188     }
 189
 190     TRACE("%s language is 0x%08lx\n",
 191         UserProfile ? "User" : "System", Lcid);
 192     Status = NtSetDefaultLocale(UserProfile, Lcid);
 193     if (!NT_SUCCESS(Status))
 194     {
 195         TRACE("NtSetDefaultLocale() failed with status 0x%08lx\n", Status);
 196         goto cleanup;
 197     }
 198
 199     ret = TRUE;
 200
 201 cleanup:
 202     if (hKey)
 203         RegCloseKey(hKey);
 204     if (Value)
 205         HeapFree(GetProcessHeap(), 0, Value);
 206     return ret;
 207 }
 208
 209 BOOL
 210 PlaySoundRoutine(
 211     IN LPCWSTR FileName,
 212     IN UINT bLogon,
 213     IN UINT Flags)
 214 {
 215     typedef BOOL (WINAPI *PLAYSOUNDW)(LPCWSTR,HMODULE,DWORD);
 216     typedef UINT (WINAPI *WAVEOUTGETNUMDEVS)(VOID);
 217     PLAYSOUNDW Play;
 218     WAVEOUTGETNUMDEVS waveOutGetNumDevs;
 219     UINT NumDevs;
 220     HMODULE hLibrary;
 221     BOOL Ret = FALSE;
 222
 223     hLibrary = LoadLibraryW(L"winmm.dll");
 224     if (hLibrary)
 225     {
 226         waveOutGetNumDevs = (WAVEOUTGETNUMDEVS)GetProcAddress(hLibrary, "waveOutGetNumDevs");
 227         if (waveOutGetNumDevs)
 228         {
 229             NumDevs = waveOutGetNumDevs();
 230             if (!NumDevs)
 231             {
 232                 if (!bLogon)
 233                 {
 234                     Beep(500, 500);
 235                 }
 236                 FreeLibrary(hLibrary);
 237                 return FALSE;
 238             }
 239         }
 240
 241         Play = (PLAYSOUNDW)GetProcAddress(hLibrary, "PlaySoundW");
 242         if (Play)
 243         {
 244             Ret = Play(FileName, NULL, Flags);
 245         }
 246         FreeLibrary(hLibrary);
 247     }
 248
 249     return Ret;
 250 }
 251
 252 DWORD
 253 WINAPI
 254 PlayLogonSoundThread(
 255     IN LPVOID lpParameter)
 256 {
 257     BYTE TokenUserBuffer[256];
 258     PTOKEN_USER pTokenUser = (TOKEN_USER*)TokenUserBuffer;
 259     ULONG Length;
 260     HKEY hKey;
 261     WCHAR wszBuffer[MAX_PATH] = {0};
 262     WCHAR wszDest[MAX_PATH];
 263     DWORD dwSize = sizeof(wszBuffer), dwType;
 264     SERVICE_STATUS_PROCESS Info;
 265     UNICODE_STRING SidString;
 266     NTSTATUS Status;
 267     ULONG Index = 0;
 268     SC_HANDLE hSCManager, hService;
 269
 270     /* Get SID of current user */
 271     Status = NtQueryInformationToken((HANDLE)lpParameter,
 272                                      TokenUser,
 273                                      TokenUserBuffer,
 274                                      sizeof(TokenUserBuffer),
 275                                      &Length);
 276     if (!NT_SUCCESS(Status))
 277     {
 278         ERR("NtQueryInformationToken failed: %x!\n", Status);
 279         return 0;
 280     }
 281
 282     /* Convert SID to string */
 283     RtlInitEmptyUnicodeString(&SidString, wszBuffer, sizeof(wszBuffer));
 284     Status = RtlConvertSidToUnicodeString(&SidString, pTokenUser->User.Sid, FALSE);
 285     if (!NT_SUCCESS(Status))
 286     {
 287         ERR("RtlConvertSidToUnicodeString failed: %x!\n", Status);
 288         return 0;
 289     }
 290
 291     /* Build path to logon sound registry key.
 292        Note: We can't use HKCU here, because Winlogon is owned by SYSTEM user */
 293     if (FAILED(StringCbCopyW(wszBuffer + SidString.Length/sizeof(WCHAR),
 294                              sizeof(wszBuffer) - SidString.Length,
 295                              L"\\AppEvents\\Schemes\\Apps\\.Default\\WindowsLogon\\.Current")))
 296     {
 297         /* SID is too long. Should not happen. */
 298         ERR("StringCbCopyW failed!\n");
 299         return 0;
 300     }
 301
 302     /* Open registry key and query sound path */
 303     if (RegOpenKeyExW(HKEY_USERS, wszBuffer, 0, KEY_READ, &hKey) != ERROR_SUCCESS)
 304     {
 305         ERR("RegOpenKeyExW(%ls) failed!\n", wszBuffer);
 306         return 0;
 307     }
 308
 309     if (RegQueryValueExW(hKey, NULL, NULL, &dwType,
 310                       (LPBYTE)wszBuffer, &dwSize) != ERROR_SUCCESS ||
 311         (dwType != REG_SZ && dwType != REG_EXPAND_SZ))
 312     {
 313         ERR("RegQueryValueExW failed!\n");
 314         RegCloseKey(hKey);
 315         return 0;
 316     }
 317
 318     RegCloseKey(hKey);
 319
 320     if (!wszBuffer[0])
 321     {
 322         /* No sound has been set */
 323         ERR("No sound has been set\n");
 324         return 0;
 325     }
 326
 327     /* Expand environment variables */
 328     if (!ExpandEnvironmentStringsW(wszBuffer, wszDest, MAX_PATH))
 329     {
 330         ERR("ExpandEnvironmentStringsW failed!\n");
 331         return 0;
 332     }
 333
 334     /* Open service manager */
 335     hSCManager = OpenSCManager(NULL, NULL, SC_MANAGER_CONNECT);
 336     if (!hSCManager)
 337     {
 338         ERR("OpenSCManager failed (%x)\n", GetLastError());
 339         return 0;
 340     }
 341
 342     /* Open wdmaud service */
 343     hService = OpenServiceW(hSCManager, L"wdmaud", GENERIC_READ);
 344     if (!hService)
 345     {
 346         /* Sound is not installed */
 347         TRACE("Failed to open wdmaud service (%x)\n", GetLastError());
 348         CloseServiceHandle(hSCManager);
 349         return 0;
 350     }
 351
 352     /* Wait for wdmaud start */
 353     do
 354     {
 355         if (!QueryServiceStatusEx(hService, SC_STATUS_PROCESS_INFO, (LPBYTE)&Info, sizeof(SERVICE_STATUS_PROCESS), &dwSize))
 356         {
 357             TRACE("QueryServiceStatusEx failed (%x)\n", GetLastError());
 358             break;
 359         }
 360
 361         if (Info.dwCurrentState == SERVICE_RUNNING)
 362             break;
 363
 364         Sleep(1000);
 365
 366     } while (Index++ < 20);
 367
 368     CloseServiceHandle(hService);
 369     CloseServiceHandle(hSCManager);
 370
 371     /* If wdmaud is not running exit */
 372     if (Info.dwCurrentState != SERVICE_RUNNING)
 373     {
 374         WARN("wdmaud has not started!\n");
 375         return 0;
 376     }
 377
 378     /* Sound subsystem is running. Play logon sound. */
 379     TRACE("Playing logon sound: %ls\n", wszDest);
 380     PlaySoundRoutine(wszDest, TRUE, SND_FILENAME);
 381     return 0;
 382 }
 383
 384 static
 385 VOID
 386 PlayLogonSound(
 387     IN OUT PWLSESSION Session)
 388 {
 389     HANDLE hThread;
 390
 391     hThread = CreateThread(NULL, 0, PlayLogonSoundThread, (PVOID)Session->UserToken, 0, NULL);
 392     if (hThread)
 393         CloseHandle(hThread);
 394 }
 395
 396 static
 397 BOOL
 398 HandleLogon(
 399     IN OUT PWLSESSION Session)
 400 {
 401     PROFILEINFOW ProfileInfo;
 402     BOOL ret = FALSE;
 403
 404     /* Loading personal settings */
 405     DisplayStatusMessage(Session, Session->WinlogonDesktop, IDS_LOADINGYOURPERSONALSETTINGS);
 406     ProfileInfo.hProfile = INVALID_HANDLE_VALUE;
 407     if (0 == (Session->Options & WLX_LOGON_OPT_NO_PROFILE))
 408     {
 409         if (Session->Profile == NULL
 410          || (Session->Profile->dwType != WLX_PROFILE_TYPE_V1_0
 411           && Session->Profile->dwType != WLX_PROFILE_TYPE_V2_0))
 412         {
 413             ERR("WL: Wrong profile\n");
 414             goto cleanup;
 415         }
 416
 417         /* Load the user profile */
 418         ZeroMemory(&ProfileInfo, sizeof(PROFILEINFOW));
 419         ProfileInfo.dwSize = sizeof(PROFILEINFOW);
 420         ProfileInfo.dwFlags = 0;
 421         ProfileInfo.lpUserName = Session->MprNotifyInfo.pszUserName;
 422         ProfileInfo.lpProfilePath = Session->Profile->pszProfile;
 423         if (Session->Profile->dwType >= WLX_PROFILE_TYPE_V2_0)
 424         {
 425             ProfileInfo.lpDefaultPath = Session->Profile->pszNetworkDefaultUserProfile;
 426             ProfileInfo.lpServerName = Session->Profile->pszServerName;
 427             ProfileInfo.lpPolicyPath = Session->Profile->pszPolicy;
 428         }
 429
 430         if (!LoadUserProfileW(Session->UserToken, &ProfileInfo))
 431         {
 432             ERR("WL: LoadUserProfileW() failed\n");
 433             goto cleanup;
 434         }
 435     }
 436
 437     /* Create environment block for the user */
 438     if (!CreateUserEnvironment(Session))
 439     {
 440         WARN("WL: SetUserEnvironment() failed\n");
 441         goto cleanup;
 442     }
 443
 444     DisplayStatusMessage(Session, Session->WinlogonDesktop, IDS_APPLYINGYOURPERSONALSETTINGS);
 445     UpdatePerUserSystemParameters(0, TRUE);
 446
 447     /* Set default language */
 448     if (!SetDefaultLanguage(TRUE))
 449     {
 450         WARN("WL: SetDefaultLanguage() failed\n");
 451         goto cleanup;
 452     }
 453
 454     if (!StartUserShell(Session))
 455     {
 456         //WCHAR StatusMsg[256];
 457         WARN("WL: WlxActivateUserShell() failed\n");
 458         //LoadStringW(hAppInstance, IDS_FAILEDACTIVATEUSERSHELL, StatusMsg, sizeof(StatusMsg) / sizeof(StatusMsg[0]));
 459         //MessageBoxW(0, StatusMsg, NULL, MB_ICONERROR);
 460         goto cleanup;
 461     }
 462
 463     if (!InitializeScreenSaver(Session))
 464         WARN("WL: Failed to initialize screen saver\n");
 465
 466     Session->hProfileInfo = ProfileInfo.hProfile;
 467
 468     /* Logon has successed. Play sound. */
 469     PlayLogonSound(Session);
 470
 471     ret = TRUE;
 472
 473 cleanup:
 474     if (Session->Profile)
 475     {
 476         HeapFree(GetProcessHeap(), 0, Session->Profile->pszProfile);
 477         HeapFree(GetProcessHeap(), 0, Session->Profile);
 478     }
 479     Session->Profile = NULL;
 480     if (!ret
 481      && ProfileInfo.hProfile != INVALID_HANDLE_VALUE)
 482     {
 483         UnloadUserProfile(WLSession->UserToken, ProfileInfo.hProfile);
 484     }
 485     RemoveStatusMessage(Session);
 486     if (!ret)
 487     {
 488         CloseHandle(Session->UserToken);
 489         Session->UserToken = NULL;
 490     }
 491     return ret;
 492 }
 493
 494
 495 static
 496 DWORD
 497 WINAPI
 498 LogoffShutdownThread(
 499     LPVOID Parameter)
 500 {
 501     PLOGOFF_SHUTDOWN_DATA LSData = (PLOGOFF_SHUTDOWN_DATA)Parameter;
 502
 503     if (LSData->Session->UserToken != NULL && !ImpersonateLoggedOnUser(LSData->Session->UserToken))
 504     {
 505         ERR("ImpersonateLoggedOnUser() failed with error %lu\n", GetLastError());
 506         return 0;
 507     }
 508
 509     /* Close processes of the interactive user */
 510     if (!ExitWindowsEx(
 511         EWX_INTERNAL_KILL_USER_APPS | (LSData->Flags & EWX_FLAGS_MASK) |
 512         (EWX_LOGOFF == (LSData->Flags & EWX_ACTION_MASK) ? EWX_INTERNAL_FLAG_LOGOFF : 0),
 513         0))
 514     {
 515         ERR("Unable to kill user apps, error %lu\n", GetLastError());
 516         RevertToSelf();
 517         return 0;
 518     }
 519
 520     /* FIXME: Call ExitWindowsEx() to terminate COM processes */
 521
 522     if (LSData->Session->UserToken)
 523         RevertToSelf();
 524
 525     return 1;
 526 }
 527
 528
 529 static
 530 NTSTATUS
 531 CreateLogoffSecurityAttributes(
 532     OUT PSECURITY_ATTRIBUTES* ppsa)
 533 {
 534     /* The following code is not working yet and messy */
 535     /* Still, it gives some ideas about data types and functions involved and */
 536     /* required to set up a SECURITY_DESCRIPTOR for a SECURITY_ATTRIBUTES */
 537     /* instance for a thread, to allow that  thread to ImpersonateLoggedOnUser(). */
 538     /* Specifically THREAD_SET_THREAD_TOKEN is required. */
 539     PSECURITY_DESCRIPTOR SecurityDescriptor = NULL;
 540     PSECURITY_ATTRIBUTES psa = 0;
 541     BYTE* pMem;
 542     PACL pACL;
 543     EXPLICIT_ACCESS Access;
 544     PSID pEveryoneSID = NULL;
 545     static SID_IDENTIFIER_AUTHORITY WorldAuthority = { SECURITY_WORLD_SID_AUTHORITY };
 546
 547     *ppsa = NULL;
 548
 549     // Let's first try to enumerate what kind of data we need for this to ever work:
 550     // 1.  The Winlogon SID, to be able to give it THREAD_SET_THREAD_TOKEN.
 551     // 2.  The users SID (the user trying to logoff, or rather shut down the system).
 552     // 3.  At least two EXPLICIT_ACCESS instances:
 553     // 3.1 One for Winlogon itself, giving it the rights
 554     //     required to THREAD_SET_THREAD_TOKEN (as it's needed to successfully call
 555     //     ImpersonateLoggedOnUser).
 556     // 3.2 One for the user, to allow *that* thread to perform its work.
 557     // 4.  An ACL to hold the these EXPLICIT_ACCESS ACE's.
 558     // 5.  A SECURITY_DESCRIPTOR to hold the ACL, and finally.
 559     // 6.  A SECURITY_ATTRIBUTES instance to pull all of this required stuff
 560     //     together, to hand it to CreateThread.
 561     //
 562     // However, it seems struct LOGOFF_SHUTDOWN_DATA doesn't contain
 563     // these required SID's, why they'd have to be added.
 564     // The Winlogon's own SID should probably only be created once,
 565     // while the user's SID obviously must be created for each new user.
 566     // Might as well store it when the user logs on?
 567
 568     if(!AllocateAndInitializeSid(&WorldAuthority,
 569                                  1,
 570                                  SECURITY_WORLD_RID,
 571                                  0, 0, 0, 0, 0, 0, 0,
 572                                  &pEveryoneSID))
 573     {
 574         ERR("Failed to initialize security descriptor for logoff thread!\n");
 575         return STATUS_UNSUCCESSFUL;
 576     }
 577
 578     /* set up the required security attributes to be able to shut down */
 579     /* To save space and time, allocate a single block of memory holding */
 580     /* both SECURITY_ATTRIBUTES and SECURITY_DESCRIPTOR */
 581     pMem = HeapAlloc(GetProcessHeap(),
 582                      0,
 583                      sizeof(SECURITY_ATTRIBUTES) +
 584                      SECURITY_DESCRIPTOR_MIN_LENGTH +
 585                      sizeof(ACL));
 586     if (!pMem)
 587     {
 588         ERR("Failed to allocate memory for logoff security descriptor!\n");
 589         return STATUS_NO_MEMORY;
 590     }
 591
 592     /* Note that the security descriptor needs to be in _absolute_ format, */
 593     /* meaning its members must be pointers to other structures, rather */
 594     /* than the relative format using offsets */
 595     psa = (PSECURITY_ATTRIBUTES)pMem;
 596     SecurityDescriptor = (PSECURITY_DESCRIPTOR)(pMem + sizeof(SECURITY_ATTRIBUTES));
 597     pACL = (PACL)(((PBYTE)SecurityDescriptor) + SECURITY_DESCRIPTOR_MIN_LENGTH);
 598
 599     // Initialize an EXPLICIT_ACCESS structure for an ACE.
 600     // The ACE will allow this thread to log off (and shut down the system, currently).
 601     ZeroMemory(&Access, sizeof(Access));
 602     Access.grfAccessPermissions = THREAD_SET_THREAD_TOKEN;
 603     Access.grfAccessMode = SET_ACCESS; // GRANT_ACCESS?
 604     Access.grfInheritance = NO_INHERITANCE;
 605     Access.Trustee.TrusteeForm = TRUSTEE_IS_SID;
 606     Access.Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
 607     Access.Trustee.ptstrName = pEveryoneSID;
 608
 609     if (SetEntriesInAcl(1, &Access, NULL, &pACL) != ERROR_SUCCESS)
 610     {
 611         ERR("Failed to set Access Rights for logoff thread. Logging out will most likely fail.\n");
 612
 613         HeapFree(GetProcessHeap(), 0, pMem);
 614         return STATUS_UNSUCCESSFUL;
 615     }
 616
 617     if (!InitializeSecurityDescriptor(SecurityDescriptor, SECURITY_DESCRIPTOR_REVISION))
 618     {
 619         ERR("Failed to initialize security descriptor for logoff thread!\n");
 620         HeapFree(GetProcessHeap(), 0, pMem);
 621         return STATUS_UNSUCCESSFUL;
 622     }
 623
 624     if (!SetSecurityDescriptorDacl(SecurityDescriptor,
 625                                    TRUE,     // bDaclPresent flag
 626                                    pACL,
 627                                    FALSE))   // not a default DACL
 628     {
 629         ERR("SetSecurityDescriptorDacl Error %lu\n", GetLastError());
 630         HeapFree(GetProcessHeap(), 0, pMem);
 631         return STATUS_UNSUCCESSFUL;
 632     }
 633
 634     psa->nLength = sizeof(SECURITY_ATTRIBUTES);
 635     psa->lpSecurityDescriptor = SecurityDescriptor;
 636     psa->bInheritHandle = FALSE;
 637
 638     *ppsa = psa;
 639
 640     return STATUS_SUCCESS;
 641 }
 642
 643 static
 644 VOID
 645 DestroyLogoffSecurityAttributes(
 646     IN PSECURITY_ATTRIBUTES psa)
 647 {
 648     if (psa)
 649     {
 650         HeapFree(GetProcessHeap(), 0, psa);
 651     }
 652 }
 653
 654
 655 static
 656 NTSTATUS
 657 HandleLogoff(
 658     IN OUT PWLSESSION Session,
 659     IN UINT Flags)
 660 {
 661     PLOGOFF_SHUTDOWN_DATA LSData;
 662     PSECURITY_ATTRIBUTES psa;
 663     HANDLE hThread;
 664     DWORD exitCode;
 665     NTSTATUS Status;
 666
 667     DisplayStatusMessage(Session, Session->WinlogonDesktop, IDS_SAVEYOURSETTINGS);
 668
 669     /* Prepare data for logoff thread */
 670     LSData = HeapAlloc(GetProcessHeap(), 0, sizeof(LOGOFF_SHUTDOWN_DATA));
 671     if (!LSData)
 672     {
 673         ERR("Failed to allocate mem for thread data\n");
 674         return STATUS_NO_MEMORY;
 675     }
 676     LSData->Flags = Flags;
 677     LSData->Session = Session;
 678
 679     Status = CreateLogoffSecurityAttributes(&psa);
 680     if (!NT_SUCCESS(Status))
 681     {
 682         ERR("Failed to create a required security descriptor. Status 0x%08lx\n", Status);
 683         HeapFree(GetProcessHeap(), 0, LSData);
 684         return Status;
 685     }
 686
 687     /* Run logoff thread */
 688     hThread = CreateThread(psa, 0, LogoffShutdownThread, (LPVOID)LSData, 0, NULL);
 689
 690     /* we're done with the SECURITY_DESCRIPTOR */
 691     DestroyLogoffSecurityAttributes(psa);
 692     psa = NULL;
 693
 694     if (!hThread)
 695     {
 696         ERR("Unable to create logoff thread, error %lu\n", GetLastError());
 697         HeapFree(GetProcessHeap(), 0, LSData);
 698         return STATUS_UNSUCCESSFUL;
 699     }
 700     WaitForSingleObject(hThread, INFINITE);
 701     HeapFree(GetProcessHeap(), 0, LSData);
 702     if (!GetExitCodeThread(hThread, &exitCode))
 703     {
 704         ERR("Unable to get exit code of logoff thread (error %lu)\n", GetLastError());
 705         CloseHandle(hThread);
 706         return STATUS_UNSUCCESSFUL;
 707     }
 708     CloseHandle(hThread);
 709     if (exitCode == 0)
 710     {
 711         ERR("Logoff thread returned failure\n");
 712         return STATUS_UNSUCCESSFUL;
 713     }
 714
 715     UnloadUserProfile(Session->UserToken, Session->hProfileInfo);
 716     CloseHandle(Session->UserToken);
 717     UpdatePerUserSystemParameters(0, FALSE);
 718     Session->LogonState = STATE_LOGGED_OFF;
 719     Session->UserToken = NULL;
 720     return STATUS_SUCCESS;
 721 }
 722
 723 static
 724 INT_PTR
 725 CALLBACK
 726 ShutdownComputerWindowProc(
 727     IN HWND hwndDlg,
 728     IN UINT uMsg,
 729     IN WPARAM wParam,
 730     IN LPARAM lParam)
 731 {
 732     UNREFERENCED_PARAMETER(lParam);
 733
 734     switch (uMsg)
 735     {
 736         case WM_COMMAND:
 737         {
 738             switch (LOWORD(wParam))
 739             {
 740                 case IDC_BTNSHTDOWNCOMPUTER:
 741                     EndDialog(hwndDlg, IDC_BTNSHTDOWNCOMPUTER);
 742                     return TRUE;
 743             }
 744             break;
 745         }
 746         case WM_INITDIALOG:
 747         {
 748             RemoveMenu(GetSystemMenu(hwndDlg, FALSE), SC_CLOSE, MF_BYCOMMAND);
 749             SetFocus(GetDlgItem(hwndDlg, IDC_BTNSHTDOWNCOMPUTER));
 750             return TRUE;
 751         }
 752     }
 753     return FALSE;
 754 }
 755
 756 static
 757 VOID
 758 UninitializeSAS(
 759     IN OUT PWLSESSION Session)
 760 {
 761     if (Session->SASWindow)
 762     {
 763         DestroyWindow(Session->SASWindow);
 764         Session->SASWindow = NULL;
 765     }
 766     if (Session->hEndOfScreenSaverThread)
 767         SetEvent(Session->hEndOfScreenSaverThread);
 768     UnregisterClassW(WINLOGON_SAS_CLASS, hAppInstance);
 769 }
 770
 771 NTSTATUS
 772 HandleShutdown(
 773     IN OUT PWLSESSION Session,
 774     IN DWORD wlxAction)
 775 {
 776     PLOGOFF_SHUTDOWN_DATA LSData;
 777     HANDLE hThread;
 778     DWORD exitCode;
 779
 780     DisplayStatusMessage(Session, Session->WinlogonDesktop, IDS_REACTOSISSHUTTINGDOWN);
 781
 782     /* Prepare data for shutdown thread */
 783     LSData = HeapAlloc(GetProcessHeap(), 0, sizeof(LOGOFF_SHUTDOWN_DATA));
 784     if (!LSData)
 785     {
 786         ERR("Failed to allocate mem for thread data\n");
 787         return STATUS_NO_MEMORY;
 788     }
 789     if (wlxAction == WLX_SAS_ACTION_SHUTDOWN_POWER_OFF)
 790         LSData->Flags = EWX_POWEROFF;
 791     else if (wlxAction == WLX_SAS_ACTION_SHUTDOWN_REBOOT)
 792         LSData->Flags = EWX_REBOOT;
 793     else
 794         LSData->Flags = EWX_SHUTDOWN;
 795     LSData->Session = Session;
 796
 797     /* Run shutdown thread */
 798     hThread = CreateThread(NULL, 0, LogoffShutdownThread, (LPVOID)LSData, 0, NULL);
 799     if (!hThread)
 800     {
 801         ERR("Unable to create shutdown thread, error %lu\n", GetLastError());
 802         HeapFree(GetProcessHeap(), 0, LSData);
 803         return STATUS_UNSUCCESSFUL;
 804     }
 805     WaitForSingleObject(hThread, INFINITE);
 806     HeapFree(GetProcessHeap(), 0, LSData);
 807     if (!GetExitCodeThread(hThread, &exitCode))
 808     {
 809         ERR("Unable to get exit code of shutdown thread (error %lu)\n", GetLastError());
 810         CloseHandle(hThread);
 811         return STATUS_UNSUCCESSFUL;
 812     }
 813     CloseHandle(hThread);
 814     if (exitCode == 0)
 815     {
 816         ERR("Shutdown thread returned failure\n");
 817         return STATUS_UNSUCCESSFUL;
 818     }
 819
 820     /* Destroy SAS window */
 821     UninitializeSAS(Session);
 822
 823     FIXME("FIXME: Call SMSS API #1\n");
 824     if (wlxAction == WLX_SAS_ACTION_SHUTDOWN_REBOOT)
 825         NtShutdownSystem(ShutdownReboot);
 826     else
 827     {
 828         if (FALSE)
 829         {
 830             /* FIXME - only show this dialog if it's a shutdown and the computer doesn't support APM */
 831             DialogBox(hAppInstance, MAKEINTRESOURCE(IDD_SHUTDOWNCOMPUTER), GetDesktopWindow(), ShutdownComputerWindowProc);
 832         }
 833         NtShutdownSystem(ShutdownNoReboot);
 834     }
 835     return STATUS_SUCCESS;
 836 }
 837
 838 static
 839 VOID
 840 DoGenericAction(
 841     IN OUT PWLSESSION Session,
 842     IN DWORD wlxAction)
 843 {
 844     switch (wlxAction)
 845     {
 846         case WLX_SAS_ACTION_LOGON: /* 0x01 */
 847             if (Session->LogonState == STATE_LOGGED_OFF_SAS)
 848             {
 849                 if (HandleLogon(Session))
 850                 {
 851                     SwitchDesktop(Session->ApplicationDesktop);
 852                     Session->LogonState = STATE_LOGGED_ON;
 853                 }
 854                 else
 855                 {
 856                     Session->Gina.Functions.WlxDisplaySASNotice(Session->Gina.Context);
 857                 }
 858             }
 859             break;
 860         case WLX_SAS_ACTION_NONE: /* 0x02 */
 861             if (Session->LogonState == STATE_LOGGED_OFF_SAS)
 862             {
 863                 Session->LogonState = STATE_LOGGED_OFF;
 864                 Session->Gina.Functions.WlxDisplaySASNotice(Session->Gina.Context);
 865             }
 866             else if (Session->LogonState == STATE_LOGGED_ON_SAS)
 867             {
 868                 Session->LogonState = STATE_LOGGED_ON;
 869             }
 870             else if (Session->LogonState == STATE_LOCKED_SAS)
 871             {
 872                 Session->LogonState = STATE_LOCKED;
 873                 Session->Gina.Functions.WlxDisplayLockedNotice(Session->Gina.Context);
 874             }
 875             break;
 876         case WLX_SAS_ACTION_LOCK_WKSTA: /* 0x03 */
 877             if (Session->Gina.Functions.WlxIsLockOk(Session->Gina.Context))
 878             {
 879                 SwitchDesktop(WLSession->WinlogonDesktop);
 880                 Session->LogonState = STATE_LOCKED;
 881                 Session->Gina.Functions.WlxDisplayLockedNotice(Session->Gina.Context);
 882             }
 883             break;
 884         case WLX_SAS_ACTION_LOGOFF: /* 0x04 */
 885         case WLX_SAS_ACTION_SHUTDOWN: /* 0x05 */
 886         case WLX_SAS_ACTION_SHUTDOWN_POWER_OFF: /* 0x0a */
 887         case WLX_SAS_ACTION_SHUTDOWN_REBOOT: /* 0x0b */
 888             if (Session->LogonState != STATE_LOGGED_OFF)
 889             {
 890                 if (!Session->Gina.Functions.WlxIsLogoffOk(Session->Gina.Context))
 891                     break;
 892                 SwitchDesktop(WLSession->WinlogonDesktop);
 893                 Session->Gina.Functions.WlxLogoff(Session->Gina.Context);
 894                 if (!NT_SUCCESS(HandleLogoff(Session, EWX_LOGOFF)))
 895                 {
 896                     RemoveStatusMessage(Session);
 897                     break;
 898                 }
 899             }
 900             if (WLX_SHUTTINGDOWN(wlxAction))
 901             {
 902                 Session->Gina.Functions.WlxShutdown(Session->Gina.Context, wlxAction);
 903                 if (!NT_SUCCESS(HandleShutdown(Session, wlxAction)))
 904                 {
 905                     RemoveStatusMessage(Session);
 906                     Session->Gina.Functions.WlxDisplaySASNotice(Session->Gina.Context);
 907                 }
 908             }
 909             else
 910             {
 911                 RemoveStatusMessage(Session);
 912                 Session->Gina.Functions.WlxDisplaySASNotice(Session->Gina.Context);
 913             }
 914             break;
 915         case WLX_SAS_ACTION_TASKLIST: /* 0x07 */
 916             SwitchDesktop(WLSession->ApplicationDesktop);
 917             Session->LogonState = STATE_LOGGED_ON;
 918             StartTaskManager(Session);
 919             break;
 920         case WLX_SAS_ACTION_UNLOCK_WKSTA: /* 0x08 */
 921             SwitchDesktop(WLSession->ApplicationDesktop);
 922             Session->LogonState = STATE_LOGGED_ON;
 923             break;
 924         default:
 925             WARN("Unknown SAS action 0x%lx\n", wlxAction);
 926     }
 927 }
 928
 929 static
 930 VOID
 931 DispatchSAS(
 932     IN OUT PWLSESSION Session,
 933     IN DWORD dwSasType)
 934 {
 935     DWORD wlxAction = WLX_SAS_ACTION_NONE;
 936     HWND hwnd;
 937     PSID LogonSid = NULL; /* FIXME */
 938     BOOL bSecure = TRUE;
 939
 940     switch (dwSasType)
 941     {
 942         case WLX_SAS_TYPE_CTRL_ALT_DEL:
 943             switch (Session->LogonState)
 944             {
 945                 case STATE_INIT:
 946                     Session->LogonState = STATE_LOGGED_OFF;
 947                     Session->Gina.Functions.WlxDisplaySASNotice(Session->Gina.Context);
 948                     return;
 949
 950                 case STATE_LOGGED_OFF:
 951                     Session->LogonState = STATE_LOGGED_OFF_SAS;
 952
 953                     hwnd = GetTopDialogWindow();
 954                     if (hwnd != NULL)
 955                         SendMessage(hwnd, WLX_WM_SAS, 0, 0);
 956
 957                     Session->Options = 0;
 958
 959                     wlxAction = (DWORD)Session->Gina.Functions.WlxLoggedOutSAS(
 960                         Session->Gina.Context,
 961                         Session->SASAction,
 962                         &Session->LogonId,
 963                         LogonSid,
 964                         &Session->Options,
 965                         &Session->UserToken,
 966                         &Session->MprNotifyInfo,
 967                         (PVOID*)&Session->Profile);
 968                     break;
 969
 970                 case STATE_LOGGED_OFF_SAS:
 971                     /* Ignore SAS if we are already in an SAS state */
 972                     return;
 973
 974                 case STATE_LOGGED_ON:
 975                     Session->LogonState = STATE_LOGGED_ON_SAS;
 976                     wlxAction = (DWORD)Session->Gina.Functions.WlxLoggedOnSAS(Session->Gina.Context, dwSasType, NULL);
 977                     break;
 978
 979                 case STATE_LOGGED_ON_SAS:
 980                     /* Ignore SAS if we are already in an SAS state */
 981                     return;
 982
 983                 case STATE_LOCKED:
 984                     Session->LogonState = STATE_LOCKED_SAS;
 985
 986                     hwnd = GetTopDialogWindow();
 987                     if (hwnd != NULL)
 988                         SendMessage(hwnd, WLX_WM_SAS, 0, 0);
 989
 990                     wlxAction = (DWORD)Session->Gina.Functions.WlxWkstaLockedSAS(Session->Gina.Context, dwSasType);
 991                     break;
 992
 993                 case STATE_LOCKED_SAS:
 994                     /* Ignore SAS if we are already in an SAS state */
 995                     return;
 996
 997                 default:
 998                     return;
 999             }
1000             break;
1001
1002         case WLX_SAS_TYPE_TIMEOUT:
1003             return;
1004
1005         case WLX_SAS_TYPE_SCRNSVR_TIMEOUT:
1006             if (!Session->Gina.Functions.WlxScreenSaverNotify(Session->Gina.Context, &bSecure))
1007             {
1008                 /* Skip start of screen saver */
1009                 SetEvent(Session->hEndOfScreenSaver);
1010             }
1011             else
1012             {
1013                 StartScreenSaver(Session);
1014                 if (bSecure)
1015                 {
1016                     wlxAction = WLX_SAS_ACTION_LOCK_WKSTA;
1017 //                    DoGenericAction(Session, WLX_SAS_ACTION_LOCK_WKSTA);
1018                 }
1019             }
1020             break;
1021
1022         case WLX_SAS_TYPE_SCRNSVR_ACTIVITY:
1023             SetEvent(Session->hUserActivity);
1024             break;
1025     }
1026
1027     DoGenericAction(Session, wlxAction);
1028 }
1029
1030 static
1031 BOOL
1032 RegisterHotKeys(
1033     IN PWLSESSION Session,
1034     IN HWND hwndSAS)
1035 {
1036     /* Register Ctrl+Alt+Del Hotkey */
1037     if (!RegisterHotKey(hwndSAS, HK_CTRL_ALT_DEL, MOD_CONTROL | MOD_ALT, VK_DELETE))
1038     {
1039         ERR("WL: Unable to register Ctrl+Alt+Del hotkey!\n");
1040         return FALSE;
1041     }
1042
1043     /* Register Ctrl+Shift+Esc (optional) */
1044     Session->TaskManHotkey = RegisterHotKey(hwndSAS, HK_CTRL_SHIFT_ESC, MOD_CONTROL | MOD_SHIFT, VK_ESCAPE);
1045     if (!Session->TaskManHotkey)
1046         WARN("WL: Warning: Unable to register Ctrl+Alt+Esc hotkey!\n");
1047     return TRUE;
1048 }
1049
1050 static
1051 BOOL
1052 UnregisterHotKeys(
1053     IN PWLSESSION Session,
1054     IN HWND hwndSAS)
1055 {
1056     /* Unregister hotkeys */
1057     UnregisterHotKey(hwndSAS, HK_CTRL_ALT_DEL);
1058
1059     if (Session->TaskManHotkey)
1060         UnregisterHotKey(hwndSAS, HK_CTRL_SHIFT_ESC);
1061
1062     return TRUE;
1063 }
1064
1065 static
1066 NTSTATUS
1067 CheckForShutdownPrivilege(
1068     IN DWORD RequestingProcessId)
1069 {
1070     HANDLE Process;
1071     HANDLE Token;
1072     BOOL CheckResult;
1073     PPRIVILEGE_SET PrivSet;
1074
1075     TRACE("CheckForShutdownPrivilege()\n");
1076
1077     Process = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, RequestingProcessId);
1078     if (!Process)
1079     {
1080         WARN("OpenProcess() failed with error %lu\n", GetLastError());
1081         return STATUS_INVALID_HANDLE;
1082     }
1083     if (!OpenProcessToken(Process, TOKEN_QUERY, &Token))
1084     {
1085         WARN("OpenProcessToken() failed with error %lu\n", GetLastError());
1086         CloseHandle(Process);
1087         return STATUS_INVALID_HANDLE;
1088     }
1089     CloseHandle(Process);
1090     PrivSet = HeapAlloc(GetProcessHeap(), 0, sizeof(PRIVILEGE_SET) + sizeof(LUID_AND_ATTRIBUTES));
1091     if (!PrivSet)
1092     {
1093         ERR("Failed to allocate mem for privilege set\n");
1094         CloseHandle(Token);
1095         return STATUS_NO_MEMORY;
1096     }
1097     PrivSet->PrivilegeCount = 1;
1098     PrivSet->Control = PRIVILEGE_SET_ALL_NECESSARY;
1099     if (!LookupPrivilegeValue(NULL, SE_SHUTDOWN_NAME, &PrivSet->Privilege[0].Luid))
1100     {
1101         WARN("LookupPrivilegeValue() failed with error %lu\n", GetLastError());
1102         HeapFree(GetProcessHeap(), 0, PrivSet);
1103         CloseHandle(Token);
1104         return STATUS_UNSUCCESSFUL;
1105     }
1106     if (!PrivilegeCheck(Token, PrivSet, &CheckResult))
1107     {
1108         WARN("PrivilegeCheck() failed with error %lu\n", GetLastError());
1109         HeapFree(GetProcessHeap(), 0, PrivSet);
1110         CloseHandle(Token);
1111         return STATUS_ACCESS_DENIED;
1112     }
1113     HeapFree(GetProcessHeap(), 0, PrivSet);
1114     CloseHandle(Token);
1115
1116     if (!CheckResult)
1117     {
1118         WARN("SE_SHUTDOWN privilege not enabled\n");
1119         return STATUS_ACCESS_DENIED;
1120     }
1121     return STATUS_SUCCESS;
1122 }
1123
1124 BOOL
1125 WINAPI
1126 HandleMessageBeep(UINT uType)
1127 {
1128     LPWSTR EventName;
1129
1130     switch(uType)
1131     {
1132     case 0xFFFFFFFF:
1133         EventName = NULL;
1134         break;
1135     case MB_OK:
1136         EventName = L"SystemDefault";
1137         break;
1138     case MB_ICONASTERISK:
1139         EventName = L"SystemAsterisk";
1140         break;
1141     case MB_ICONEXCLAMATION:
1142         EventName = L"SystemExclamation";
1143         break;
1144     case MB_ICONHAND:
1145         EventName = L"SystemHand";
1146         break;
1147     case MB_ICONQUESTION:
1148         EventName = L"SystemQuestion";
1149         break;
1150     default:
1151         WARN("Unhandled type %d\n", uType);
1152         EventName = L"SystemDefault";
1153     }
1154
1155     return PlaySoundRoutine(EventName, FALSE, SND_ALIAS | SND_NOWAIT | SND_NOSTOP | SND_ASYNC);
1156 }
1157
1158 static
1159 LRESULT
1160 CALLBACK
1161 SASWindowProc(
1162     IN HWND hwndDlg,
1163     IN UINT uMsg,
1164     IN WPARAM wParam,
1165     IN LPARAM lParam)
1166 {
1167     PWLSESSION Session = (PWLSESSION)GetWindowLongPtr(hwndDlg, GWLP_USERDATA);
1168
1169     switch (uMsg)
1170     {
1171         case WM_HOTKEY:
1172         {
1173             switch (lParam)
1174             {
1175                 case MAKELONG(MOD_CONTROL | MOD_ALT, VK_DELETE):
1176                 {
1177                     TRACE("SAS: CONTROL+ALT+DELETE\n");
1178                     if (!Session->Gina.UseCtrlAltDelete)
1179                         break;
1180                     PostMessageW(Session->SASWindow, WLX_WM_SAS, WLX_SAS_TYPE_CTRL_ALT_DEL, 0);
1181                     return TRUE;
1182                 }
1183                 case MAKELONG(MOD_CONTROL | MOD_SHIFT, VK_ESCAPE):
1184                 {
1185                     TRACE("SAS: CONTROL+SHIFT+ESCAPE\n");
1186                     DoGenericAction(Session, WLX_SAS_ACTION_TASKLIST);
1187                     return TRUE;
1188                 }
1189             }
1190             break;
1191         }
1192         case WM_CREATE:
1193         {
1194             /* Get the session pointer from the create data */
1195             Session = (PWLSESSION)((LPCREATESTRUCT)lParam)->lpCreateParams;
1196
1197             /* Save the Session pointer */
1198             SetWindowLongPtrW(hwndDlg, GWLP_USERDATA, (LONG_PTR)Session);
1199             if (GetSetupType())
1200                 return TRUE;
1201             return RegisterHotKeys(Session, hwndDlg);
1202         }
1203         case WM_DESTROY:
1204         {
1205             if (!GetSetupType())
1206                 UnregisterHotKeys(Session, hwndDlg);
1207             return TRUE;
1208         }
1209         case WM_SETTINGCHANGE:
1210         {
1211             UINT uiAction = (UINT)wParam;
1212             if (uiAction == SPI_SETSCREENSAVETIMEOUT
1213              || uiAction == SPI_SETSCREENSAVEACTIVE)
1214             {
1215                 SetEvent(Session->hScreenSaverParametersChanged);
1216             }
1217             return TRUE;
1218         }
1219         case WM_LOGONNOTIFY:
1220         {
1221             switch(wParam)
1222             {
1223                 case LN_MESSAGE_BEEP:
1224                 {
1225                     return HandleMessageBeep(lParam);
1226                 }
1227                 case LN_SHELL_EXITED:
1228                 {
1229                     /* lParam is the exit code */
1230                     if(lParam != 1)
1231                     {
1232                         SetTimer(hwndDlg, 1, 1000, NULL);
1233                     }
1234                     break;
1235                 }
1236                 case LN_START_SCREENSAVE:
1237                 {
1238                     DispatchSAS(Session, WLX_SAS_TYPE_SCRNSVR_TIMEOUT);
1239                     break;
1240                 }
1241                 case LN_LOCK_WORKSTATION:
1242                 {
1243                     DoGenericAction(Session, WLX_SAS_ACTION_LOCK_WKSTA);
1244                     break;
1245                 }
1246                 default:
1247                 {
1248                     ERR("WM_LOGONNOTIFY case %d is unimplemented\n", wParam);
1249                 }
1250             }
1251             return 0;
1252         }
1253         case WM_TIMER:
1254         {
1255             if (wParam == 1)
1256             {
1257                 KillTimer(hwndDlg, 1);
1258                 StartUserShell(Session);
1259             }
1260             break;
1261         }
1262         case WLX_WM_SAS:
1263         {
1264             DispatchSAS(Session, (DWORD)wParam);
1265             return TRUE;
1266         }
1267         case PM_WINLOGON_EXITWINDOWS:
1268         {
1269             UINT Flags = (UINT)lParam;
1270             UINT Action = Flags & EWX_ACTION_MASK;
1271             DWORD wlxAction;
1272
1273             /* Check parameters */
1274             switch (Action)
1275             {
1276                 case EWX_LOGOFF: wlxAction = WLX_SAS_ACTION_LOGOFF; break;
1277                 case EWX_SHUTDOWN: wlxAction = WLX_SAS_ACTION_SHUTDOWN; break;
1278                 case EWX_REBOOT: wlxAction = WLX_SAS_ACTION_SHUTDOWN_REBOOT; break;
1279                 case EWX_POWEROFF: wlxAction = WLX_SAS_ACTION_SHUTDOWN_POWER_OFF; break;
1280                 default:
1281                 {
1282                     ERR("Invalid ExitWindows action 0x%x\n", Action);
1283                     return STATUS_INVALID_PARAMETER;
1284                 }
1285             }
1286
1287             if (WLX_SHUTTINGDOWN(wlxAction))
1288             {
1289                 NTSTATUS Status = CheckForShutdownPrivilege((DWORD)wParam);
1290                 if (!NT_SUCCESS(Status))
1291                     return Status;
1292             }
1293             DoGenericAction(Session, wlxAction);
1294             return 1;
1295         }
1296     }
1297
1298     return DefWindowProc(hwndDlg, uMsg, wParam, lParam);
1299 }
1300
1301 BOOL
1302 InitializeSAS(
1303     IN OUT PWLSESSION Session)
1304 {
1305     WNDCLASSEXW swc;
1306     BOOL ret = FALSE;
1307
1308     if (!SwitchDesktop(Session->WinlogonDesktop))
1309     {
1310         ERR("WL: Failed to switch to winlogon desktop\n");
1311         goto cleanup;
1312     }
1313
1314     /* Register SAS window class */
1315     swc.cbSize = sizeof(WNDCLASSEXW);
1316     swc.style = CS_SAVEBITS;
1317     swc.lpfnWndProc = SASWindowProc;
1318     swc.cbClsExtra = 0;
1319     swc.cbWndExtra = 0;
1320     swc.hInstance = hAppInstance;
1321     swc.hIcon = NULL;
1322     swc.hCursor = NULL;
1323     swc.hbrBackground = NULL;
1324     swc.lpszMenuName = NULL;
1325     swc.lpszClassName = WINLOGON_SAS_CLASS;
1326     swc.hIconSm = NULL;
1327     if (RegisterClassExW(&swc) == 0)
1328     {
1329         ERR("WL: Failed to register SAS window class\n");
1330         goto cleanup;
1331     }
1332
1333     /* Create invisible SAS window */
1334     Session->SASWindow = CreateWindowExW(
1335         0,
1336         WINLOGON_SAS_CLASS,
1337         WINLOGON_SAS_TITLE,
1338         WS_POPUP,
1339         0, 0, 0, 0, 0, 0,
1340         hAppInstance, Session);
1341     if (!Session->SASWindow)
1342     {
1343         ERR("WL: Failed to create SAS window\n");
1344         goto cleanup;
1345     }
1346
1347     /* Register SAS window to receive SAS notifications */
1348     if (!SetLogonNotifyWindow(Session->SASWindow, Session->InteractiveWindowStation))
1349     {
1350         ERR("WL: Failed to register SAS window\n");
1351         goto cleanup;
1352     }
1353
1354     if (!SetDefaultLanguage(FALSE))
1355         return FALSE;
1356
1357     ret = TRUE;
1358
1359 cleanup:
1360     if (!ret)
1361         UninitializeSAS(Session);
1362     return ret;
1363 }