dll/appcompat/apphelp/shimeng.c

   1 /*
   2  * PROJECT:     ReactOS Application compatibility module
   3  * LICENSE:     GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
   4  * PURPOSE:     Shim engine core
   5  * COPYRIGHT:   Copyright 2015-2019 Mark Jansen (mark.jansen@reactos.org)
   6  */
   7
   8 #define WIN32_NO_STATUS
   9 #include "ntndk.h"
  10 #define IN_APPHELP
  11 #include "shimlib.h"
  12 #include <strsafe.h>
  13 /* Make sure we don't include apphelp logging */
  14 #define APPHELP_NOSDBPAPI
  15 #include "apphelp.h"
  16 #include "shimeng.h"
  17
  18
  19
  20 FARPROC WINAPI StubGetProcAddress(HINSTANCE hModule, LPCSTR lpProcName);
  21 BOOL WINAPI SE_IsShimDll(PVOID BaseAddress);
  22
  23 static const UNICODE_STRING Ntdll = RTL_CONSTANT_STRING(L"ntdll.dll");
  24 static const UNICODE_STRING Kernel32 = RTL_CONSTANT_STRING(L"kernel32.dll");
  25 static const UNICODE_STRING Verifier = RTL_CONSTANT_STRING(L"verifier.dll");
  26
  27 extern HMODULE g_hInstance;
  28 static UNICODE_STRING g_WindowsDirectory;
  29 static UNICODE_STRING g_System32Directory;
  30 static UNICODE_STRING g_SxsDirectory;
  31 static UNICODE_STRING g_LoadingShimDll;
  32 ULONG g_ShimEngDebugLevel = 0xffffffff;
  33 BOOL g_bComPlusImage = FALSE;
  34 BOOL g_bShimDuringInit = FALSE;
  35 BOOL g_bInternalHooksUsed = FALSE;
  36 static ARRAY g_pShimInfo;   /* PSHIMMODULE */
  37 static ARRAY g_pHookArray;  /* HOOKMODULEINFO */
  38 static ARRAY g_InExclude;   /* INEXCLUDE */
  39
  40 /* If we have setup a hook for a function, we should also redirect GetProcAddress for this function */
  41 HOOKAPIEX g_IntHookEx[] =
  42 {
  43     {
  44         "kernel32.dll",     /* LibraryName */
  45         "GetProcAddress",   /* FunctionName */
  46         StubGetProcAddress, /* ReplacementFunction*/
  47         NULL,               /* OriginalFunction */
  48         NULL,               /* pShimInfo */
  49         NULL                /* Unused */
  50     },
  51 };
  52
  53 static inline BOOL ARRAY_InitWorker(PARRAY Array, DWORD ItemSize)
  54 {
  55     Array->Data__ = NULL;
  56     Array->Size__ = Array->MaxSize__ = 0;
  57     Array->ItemSize__ = ItemSize;
  58
  59     return TRUE;
  60 }
  61
  62 static inline BOOL ARRAY_EnsureSize(PARRAY Array, DWORD ItemSize, DWORD GrowWith)
  63 {
  64     PVOID pNewData;
  65     DWORD Count;
  66
  67     ASSERT(Array);
  68     ASSERT(ItemSize == Array->ItemSize__);
  69
  70     if (Array->MaxSize__ > Array->Size__)
  71         return TRUE;
  72
  73     Count = Array->Size__ + GrowWith;
  74     pNewData = SeiAlloc(Count * ItemSize);
  75
  76     if (!pNewData)
  77     {
  78         SHIMENG_FAIL("Failed to allocate %d bytes\n", Count * ItemSize);
  79         return FALSE;
  80     }
  81     Array->MaxSize__ = Count;
  82
  83     if (Array->Data__)
  84     {
  85         memcpy(pNewData, Array->Data__, Array->Size__ * ItemSize);
  86         SeiFree(Array->Data__);
  87     }
  88     Array->Data__ = pNewData;
  89
  90     return TRUE;
  91 }
  92
  93 static inline PVOID ARRAY_AppendWorker(PARRAY Array, DWORD ItemSize, DWORD GrowWith)
  94 {
  95     PBYTE pData;
  96
  97     if (!ARRAY_EnsureSize(Array, ItemSize, GrowWith))
  98         return NULL;
  99
 100     pData = Array->Data__;
 101     pData += (Array->Size__ * ItemSize);
 102     Array->Size__++;
 103
 104     return pData;
 105 }
 106
 107 static inline PVOID ARRAY_AtWorker(PARRAY Array, DWORD ItemSize, DWORD n)
 108 {
 109     PBYTE pData;
 110
 111     ASSERT(Array);
 112     ASSERT(ItemSize == Array->ItemSize__);
 113     ASSERT(n < Array->Size__);
 114
 115     pData = Array->Data__;
 116     return pData + (n * ItemSize);
 117 }
 118
 119
 120 #define ARRAY_Init(Array, TypeOfArray)      ARRAY_InitWorker((Array), sizeof(TypeOfArray))
 121 #define ARRAY_Append(Array, TypeOfArray)    (TypeOfArray*)ARRAY_AppendWorker((Array), sizeof(TypeOfArray), 5)
 122 #define ARRAY_At(Array, TypeOfArray, at)    (TypeOfArray*)ARRAY_AtWorker((Array), sizeof(TypeOfArray), at)
 123 #define ARRAY_Size(Array)                   (Array)->Size__
 124
 125
 126 VOID SeiInitDebugSupport(VOID)
 127 {
 128     static const UNICODE_STRING DebugKey = RTL_CONSTANT_STRING(L"SHIMENG_DEBUG_LEVEL");
 129     UNICODE_STRING DebugValue;
 130     NTSTATUS Status;
 131     ULONG NewLevel = SEI_MSG;   /* Show some basic info in the logs, unless configured different */
 132     WCHAR Buffer[40];
 133
 134     RtlInitEmptyUnicodeString(&DebugValue, Buffer, sizeof(Buffer));
 135
 136     Status = RtlQueryEnvironmentVariable_U(NULL, &DebugKey, &DebugValue);
 137
 138     if (NT_SUCCESS(Status))
 139     {
 140         if (!NT_SUCCESS(RtlUnicodeStringToInteger(&DebugValue, 10, &NewLevel)))
 141             NewLevel = 0;
 142     }
 143     g_ShimEngDebugLevel = NewLevel;
 144 }
 145
 146
 147 /**
 148  * Outputs diagnostic info.
 149  *
 150  * @param [in]  Level           The level to log this message with, choose any of [SHIM_ERR,
 151  *                              SHIM_WARN, SHIM_INFO].
 152  * @param [in]  FunctionName    The function this log should be attributed to.
 153  * @param [in]  Format          The format string.
 154  * @param   ...                 Variable arguments providing additional information.
 155  *
 156  * @return  Success: TRUE Failure: FALSE.
 157  */
 158 BOOL WINAPIV SeiDbgPrint(SEI_LOG_LEVEL Level, PCSTR Function, PCSTR Format, ...)
 159 {
 160     char Buffer[512];
 161     char* Current = Buffer;
 162     const char* LevelStr;
 163     size_t Length = sizeof(Buffer);
 164     va_list ArgList;
 165     HRESULT hr;
 166
 167     if (g_ShimEngDebugLevel == 0xffffffff)
 168         SeiInitDebugSupport();
 169
 170     if (Level > g_ShimEngDebugLevel)
 171         return FALSE;
 172
 173     switch (Level)
 174     {
 175     case SEI_MSG:
 176         LevelStr = "MSG ";
 177         break;
 178     case SEI_FAIL:
 179         LevelStr = "FAIL";
 180         break;
 181     case SEI_WARN:
 182         LevelStr = "WARN";
 183         break;
 184     case SEI_INFO:
 185         LevelStr = "INFO";
 186         break;
 187     default:
 188         LevelStr = "USER";
 189         break;
 190     }
 191
 192     if (Function)
 193         hr = StringCchPrintfExA(Current, Length, &Current, &Length, STRSAFE_NULL_ON_FAILURE, "[%s] [%s] ", LevelStr, Function);
 194     else
 195         hr = StringCchPrintfExA(Current, Length, &Current, &Length, STRSAFE_NULL_ON_FAILURE, "[%s] ", LevelStr);
 196
 197     if (!SUCCEEDED(hr))
 198         return FALSE;
 199
 200     va_start(ArgList, Format);
 201     hr = StringCchVPrintfExA(Current, Length, &Current, &Length, STRSAFE_NULL_ON_FAILURE, Format, ArgList);
 202     va_end(ArgList);
 203     if (!SUCCEEDED(hr))
 204         return FALSE;
 205
 206     DbgPrint("%s", Buffer);
 207     return TRUE;
 208 }
 209
 210
 211 PVOID SeiGetModuleFromAddress(PVOID addr)
 212 {
 213     PVOID hModule = NULL;
 214     RtlPcToFileHeader(addr, &hModule);
 215     return hModule;
 216 }
 217
 218
 219
 220 /* TODO: Guard against recursive calling / calling init multiple times! */
 221 VOID NotifyShims(DWORD dwReason, PVOID Info)
 222 {
 223     DWORD n;
 224
 225     for (n = 0; n < ARRAY_Size(&g_pShimInfo); ++n)
 226     {
 227         PSHIMMODULE pShimModule = *ARRAY_At(&g_pShimInfo, PSHIMMODULE, n);
 228         if (!pShimModule->pNotifyShims)
 229             continue;
 230
 231         pShimModule->pNotifyShims(dwReason, Info);
 232     }
 233 }
 234
 235
 236
 237 VOID SeiCheckComPlusImage(PVOID BaseAddress)
 238 {
 239     ULONG ComSectionSize;
 240     g_bComPlusImage = RtlImageDirectoryEntryToData(BaseAddress, TRUE, IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR, &ComSectionSize) != NULL;
 241
 242     SHIMENG_INFO("COM+ executable %s\n", g_bComPlusImage ? "TRUE" : "FALSE");
 243 }
 244
 245
 246 PSHIMMODULE SeiGetShimModuleInfo(PVOID BaseAddress)
 247 {
 248     DWORD n;
 249
 250     for (n = 0; n < ARRAY_Size(&g_pShimInfo); ++n)
 251     {
 252         PSHIMMODULE pShimModule = *ARRAY_At(&g_pShimInfo, PSHIMMODULE, n);
 253
 254         if (pShimModule->BaseAddress == BaseAddress)
 255             return pShimModule;
 256     }
 257     return NULL;
 258 }
 259
 260 PSHIMMODULE SeiCreateShimModuleInfo(PCWSTR DllName, PVOID BaseAddress)
 261 {
 262     static const ANSI_STRING GetHookAPIs = RTL_CONSTANT_STRING("GetHookAPIs");
 263     static const ANSI_STRING NotifyShims = RTL_CONSTANT_STRING("NotifyShims");
 264     PSHIMMODULE* pData, Data;
 265     PVOID pGetHookAPIs, pNotifyShims;
 266
 267     if (!NT_SUCCESS(LdrGetProcedureAddress(BaseAddress, (PANSI_STRING)&GetHookAPIs, 0, &pGetHookAPIs)) ||
 268         !NT_SUCCESS(LdrGetProcedureAddress(BaseAddress, (PANSI_STRING)&NotifyShims, 0, &pNotifyShims)))
 269     {
 270         SHIMENG_WARN("Failed to resolve entry points for %S\n", DllName);
 271         return NULL;
 272     }
 273
 274     pData = ARRAY_Append(&g_pShimInfo, PSHIMMODULE);
 275     if (!pData)
 276         return NULL;
 277
 278     *pData = SeiAlloc(sizeof(SHIMMODULE));
 279
 280     Data = *pData;
 281
 282     RtlCreateUnicodeString(&Data->Name, DllName);
 283     Data->BaseAddress = BaseAddress;
 284
 285     Data->pGetHookAPIs = pGetHookAPIs;
 286     Data->pNotifyShims = pNotifyShims;
 287
 288     ARRAY_Init(&Data->EnabledShims, PSHIMINFO);
 289
 290     return Data;
 291 }
 292
 293 PSHIMINFO SeiAppendHookInfo(PSHIMMODULE pShimModuleInfo, PHOOKAPIEX pHookApi, DWORD dwHookCount, PCWSTR ShimName)
 294 {
 295     PSHIMINFO* pData, Data;
 296
 297     pData = ARRAY_Append(&pShimModuleInfo->EnabledShims, PSHIMINFO);
 298     if (!pData)
 299         return NULL;
 300
 301     *pData = SeiAlloc(sizeof(SHIMINFO));
 302     Data = *pData;
 303
 304     if (!Data)
 305         return NULL;
 306
 307     Data->ShimName = SdbpStrDup(ShimName);
 308     if (!Data->ShimName)
 309         return NULL;
 310
 311     Data->pHookApi = pHookApi;
 312     Data->dwHookCount = dwHookCount;
 313     Data->pShimModule = pShimModuleInfo;
 314     ARRAY_Init(&Data->InExclude, INEXCLUDE);
 315     return Data;
 316 }
 317
 318 PHOOKMODULEINFO SeiFindHookModuleInfo(PUNICODE_STRING ModuleName, PVOID BaseAddress)
 319 {
 320     DWORD n;
 321
 322     if (ModuleName == NULL && BaseAddress == NULL)
 323     {
 324         BaseAddress = NtCurrentPeb()->ImageBaseAddress;
 325     }
 326
 327     for (n = 0; n < ARRAY_Size(&g_pHookArray); ++n)
 328     {
 329         PHOOKMODULEINFO pModuleInfo = ARRAY_At(&g_pHookArray, HOOKMODULEINFO, n);
 330
 331         if (BaseAddress && BaseAddress == pModuleInfo->BaseAddress)
 332             return pModuleInfo;
 333
 334         if (!BaseAddress && RtlEqualUnicodeString(ModuleName, &pModuleInfo->Name, TRUE))
 335             return pModuleInfo;
 336     }
 337
 338     return NULL;
 339 }
 340
 341 PHOOKMODULEINFO SeiFindHookModuleInfoForImportDescriptor(PBYTE DllBase, PIMAGE_IMPORT_DESCRIPTOR ImportDescriptor)
 342 {
 343     UNICODE_STRING DllName;
 344     PVOID DllHandle;
 345     NTSTATUS Success;
 346
 347     if (!RtlCreateUnicodeStringFromAsciiz(&DllName, (PCSZ)(DllBase + ImportDescriptor->Name)))
 348     {
 349         SHIMENG_FAIL("Unable to convert dll name to unicode\n");
 350         return NULL;
 351     }
 352
 353     Success = LdrGetDllHandle(NULL, NULL, &DllName, &DllHandle);
 354
 355     if (!NT_SUCCESS(Success))
 356     {
 357         SHIMENG_FAIL("Unable to get module handle for %wZ (%p)\n", &DllName, DllBase);
 358         RtlFreeUnicodeString(&DllName);
 359
 360         return NULL;
 361     }
 362     RtlFreeUnicodeString(&DllName);
 363
 364     return SeiFindHookModuleInfo(NULL, DllHandle);
 365 }
 366
 367 static LPCWSTR SeiGetStringPtr(PDB pdb, TAGID tag, TAG type)
 368 {
 369     TAGID tagEntry = SdbFindFirstTag(pdb, tag, type);
 370     if (tagEntry == TAGID_NULL)
 371         return NULL;
 372
 373     return SdbGetStringTagPtr(pdb, tagEntry);
 374 }
 375
 376 static DWORD SeiGetDWORD(PDB pdb, TAGID tag, TAG type)
 377 {
 378     TAGID tagEntry = SdbFindFirstTag(pdb, tag, type);
 379     if (tagEntry == TAGID_NULL)
 380         return 0;
 381
 382     return SdbReadDWORDTag(pdb, tagEntry, 0);
 383 }
 384
 385 static QWORD SeiGetQWORD(PDB pdb, TAGID tag, TAG type)
 386 {
 387     TAGID tagEntry = SdbFindFirstTag(pdb, tag, type);
 388     if (tagEntry == TAGID_NULL)
 389         return 0;
 390
 391     return SdbReadQWORDTag(pdb, tagEntry, 0);
 392 }
 393
 394 static VOID SeiAddShim(TAGREF trShimRef, PARRAY pShimRef)
 395 {
 396     TAGREF* Data;
 397
 398     Data = ARRAY_Append(pShimRef, TAGREF);
 399     if (!Data)
 400         return;
 401
 402     *Data = trShimRef;
 403 }
 404
 405 static VOID SeiAddFlag(PDB pdb, TAGID tiFlagRef, PFLAGINFO pFlagInfo)
 406 {
 407     ULARGE_INTEGER Flag;
 408
 409     /* Resolve the FLAG_REF to the real FLAG node */
 410     TAGID FlagTag = SeiGetDWORD(pdb, tiFlagRef, TAG_FLAG_TAGID);
 411
 412     if (FlagTag == TAGID_NULL)
 413         return;
 414
 415     pFlagInfo->AppCompatFlags.QuadPart |= SeiGetQWORD(pdb, FlagTag, TAG_FLAG_MASK_KERNEL);
 416     pFlagInfo->AppCompatFlagsUser.QuadPart |= SeiGetQWORD(pdb, FlagTag, TAG_FLAG_MASK_USER);
 417     Flag.QuadPart = SeiGetQWORD(pdb, FlagTag, TAG_FLAG_PROCESSPARAM);
 418     pFlagInfo->ProcessParameters_Flags |= Flag.LowPart;
 419 }
 420
 421 /* Propagate layers to child processes */
 422 static VOID SeiSetLayerEnvVar(LPCWSTR wszLayer)
 423 {
 424     NTSTATUS Status;
 425     UNICODE_STRING VarName = RTL_CONSTANT_STRING(L"__COMPAT_LAYER");
 426     UNICODE_STRING Value;
 427
 428     RtlInitUnicodeString(&Value, wszLayer);
 429
 430     Status = RtlSetEnvironmentVariable(NULL, &VarName, &Value);
 431     if (NT_SUCCESS(Status))
 432         SHIMENG_INFO("Set env var %wZ=%wZ\n", &VarName, &Value);
 433     else
 434         SHIMENG_FAIL("Failed to set %wZ: 0x%x\n", &VarName, Status);
 435 }
 436
 437 #define MAX_LAYER_LENGTH            256
 438
 439 /* Translate all Exe and Layer entries to Shims, and propagate all layers */
 440 static VOID SeiBuildShimRefArray(HSDB hsdb, SDBQUERYRESULT* pQuery, PARRAY pShimRef, PFLAGINFO pFlagInfo)
 441 {
 442     WCHAR wszLayerEnvVar[MAX_LAYER_LENGTH] = { 0 };
 443     DWORD n;
 444
 445     for (n = 0; n < pQuery->dwExeCount; ++n)
 446     {
 447         PDB pdb;
 448         TAGID tag;
 449         if (SdbTagRefToTagID(hsdb, pQuery->atrExes[n], &pdb, &tag))
 450         {
 451             LPCWSTR ExeName = SeiGetStringPtr(pdb, tag, TAG_NAME);
 452             TAGID ShimRef = SdbFindFirstTag(pdb, tag, TAG_SHIM_REF);
 453             TAGID FlagRef = SdbFindFirstTag(pdb, tag, TAG_FLAG_REF);
 454
 455             if (ExeName)
 456                 SeiDbgPrint(SEI_MSG, NULL, "ShimInfo(Exe(%S))\n", ExeName);
 457
 458             while (ShimRef != TAGID_NULL)
 459             {
 460                 TAGREF trShimRef;
 461                 if (SdbTagIDToTagRef(hsdb, pdb, ShimRef, &trShimRef))
 462                     SeiAddShim(trShimRef, pShimRef);
 463
 464                 ShimRef = SdbFindNextTag(pdb, tag, ShimRef);
 465             }
 466
 467             while (FlagRef != TAGID_NULL)
 468             {
 469                 SeiAddFlag(pdb, FlagRef, pFlagInfo);
 470
 471                 FlagRef = SdbFindNextTag(pdb, tag, FlagRef);
 472             }
 473         }
 474     }
 475
 476
 477     for (n = 0; n < pQuery->dwLayerCount; ++n)
 478     {
 479         PDB pdb;
 480         TAGID tag;
 481         if (SdbTagRefToTagID(hsdb, pQuery->atrLayers[n], &pdb, &tag))
 482         {
 483             LPCWSTR LayerName = SeiGetStringPtr(pdb, tag, TAG_NAME);
 484             TAGID ShimRef = SdbFindFirstTag(pdb, tag, TAG_SHIM_REF);
 485             TAGID FlagRef = SdbFindFirstTag(pdb, tag, TAG_FLAG_REF);
 486
 487             if (LayerName)
 488             {
 489                 HRESULT hr;
 490                 SeiDbgPrint(SEI_MSG, NULL, "ShimInfo(Layer(%S))\n", LayerName);
 491                 if (wszLayerEnvVar[0])
 492                     StringCchCatW(wszLayerEnvVar, ARRAYSIZE(wszLayerEnvVar), L" ");
 493                 hr = StringCchCatW(wszLayerEnvVar, ARRAYSIZE(wszLayerEnvVar), LayerName);
 494                 if (!SUCCEEDED(hr))
 495                 {
 496                     SHIMENG_FAIL("Unable to append %S\n", LayerName);
 497                 }
 498             }
 499
 500             while (ShimRef != TAGID_NULL)
 501             {
 502                 TAGREF trShimRef;
 503                 if (SdbTagIDToTagRef(hsdb, pdb, ShimRef, &trShimRef))
 504                     SeiAddShim(trShimRef, pShimRef);
 505
 506                 ShimRef = SdbFindNextTag(pdb, tag, ShimRef);
 507             }
 508
 509             while (FlagRef != TAGID_NULL)
 510             {
 511                 SeiAddFlag(pdb, FlagRef, pFlagInfo);
 512
 513                 FlagRef = SdbFindNextTag(pdb, tag, FlagRef);
 514             }
 515         }
 516     }
 517     if (wszLayerEnvVar[0])
 518         SeiSetLayerEnvVar(wszLayerEnvVar);
 519 }
 520
 521 /* Given the hooks from one shim, find the relevant modules and store the combination of module + hook */
 522 VOID SeiAddHooks(PHOOKAPIEX hooks, DWORD dwHookCount, PSHIMINFO pShim)
 523 {
 524     DWORD n, j;
 525     UNICODE_STRING UnicodeModName;
 526     WCHAR Buf[512];
 527
 528     RtlInitEmptyUnicodeString(&UnicodeModName, Buf, sizeof(Buf));
 529
 530     for (n = 0; n < dwHookCount; ++n)
 531     {
 532         ANSI_STRING AnsiString;
 533         PVOID DllHandle;
 534         PHOOKAPIEX hook = hooks + n;
 535         PHOOKAPIEX* pHookApi;
 536         PHOOKMODULEINFO HookModuleInfo;
 537
 538         RtlInitAnsiString(&AnsiString, hook->LibraryName);
 539         if (!NT_SUCCESS(RtlAnsiStringToUnicodeString(&UnicodeModName, &AnsiString, FALSE)))
 540         {
 541             SHIMENG_FAIL("Unable to convert %s to Unicode\n", hook->LibraryName);
 542             continue;
 543         }
 544
 545         RtlInitAnsiString(&AnsiString, hook->FunctionName);
 546         if (NT_SUCCESS(LdrGetDllHandle(NULL, 0, &UnicodeModName, &DllHandle)))
 547         {
 548             PVOID ProcAddress;
 549
 550
 551             if (!NT_SUCCESS(LdrGetProcedureAddress(DllHandle, &AnsiString, 0, &ProcAddress)))
 552             {
 553                 SHIMENG_FAIL("Unable to retrieve %s!%s\n", hook->LibraryName, hook->FunctionName);
 554                 continue;
 555             }
 556
 557             HookModuleInfo = SeiFindHookModuleInfo(NULL, DllHandle);
 558             hook->OriginalFunction = ProcAddress;
 559         }
 560         else
 561         {
 562             HookModuleInfo = SeiFindHookModuleInfo(&UnicodeModName, NULL);
 563             DllHandle = NULL;
 564         }
 565
 566         if (!HookModuleInfo)
 567         {
 568             HookModuleInfo = ARRAY_Append(&g_pHookArray, HOOKMODULEINFO);
 569             if (!HookModuleInfo)
 570                 continue;
 571
 572             HookModuleInfo->BaseAddress = DllHandle;
 573             ARRAY_Init(&HookModuleInfo->HookApis, PHOOKAPIEX);
 574             RtlCreateUnicodeString(&HookModuleInfo->Name, UnicodeModName.Buffer);
 575         }
 576
 577         hook->pShimInfo = pShim;
 578
 579         for (j = 0; j < ARRAY_Size(&HookModuleInfo->HookApis); ++j)
 580         {
 581             PHOOKAPIEX HookApi = *ARRAY_At(&HookModuleInfo->HookApis, PHOOKAPIEX, j);
 582             int CmpResult = strcmp(hook->FunctionName, HookApi->FunctionName);
 583             if (CmpResult == 0)
 584             {
 585                 /* Multiple hooks on one function? --> use ApiLink */
 586                 SHIMENG_FAIL("Multiple hooks on one API is not yet supported!\n");
 587                 ASSERT(0);
 588             }
 589         }
 590         pHookApi = ARRAY_Append(&HookModuleInfo->HookApis, PHOOKAPIEX);
 591         if (pHookApi)
 592             *pHookApi = hook;
 593     }
 594 }
 595
 596 typedef FARPROC(WINAPI* GETPROCADDRESSPROC)(HINSTANCE, LPCSTR);
 597
 598 /* Check if we should fake the return from GetProcAddress (because we also redirected the iat for this module) */
 599 FARPROC WINAPI StubGetProcAddress(HINSTANCE hModule, LPCSTR lpProcName)
 600 {
 601     char szOrdProcName[10] = "";
 602     LPCSTR lpPrintName = lpProcName;
 603     PVOID Addr = _ReturnAddress();
 604     PHOOKMODULEINFO HookModuleInfo;
 605     FARPROC proc = ((GETPROCADDRESSPROC)g_IntHookEx[0].OriginalFunction)(hModule, lpProcName);
 606
 607     if ((DWORD_PTR)lpProcName <= MAXUSHORT)
 608     {
 609         sprintf(szOrdProcName, "#%Iu", (DWORD_PTR)lpProcName);
 610         lpPrintName = szOrdProcName;
 611     }
 612
 613     Addr = SeiGetModuleFromAddress(Addr);
 614     if (SE_IsShimDll(Addr))
 615     {
 616         SHIMENG_MSG("Not touching GetProcAddress for shim dll (%p!%s)", hModule, lpPrintName);
 617         return proc;
 618     }
 619
 620     SHIMENG_INFO("(GetProcAddress(%p!%s) => %p\n", hModule, lpPrintName, proc);
 621
 622     HookModuleInfo = SeiFindHookModuleInfo(NULL, hModule);
 623
 624     /* FIXME: Ordinal not yet supported */
 625     if (HookModuleInfo && HIWORD(lpProcName))
 626     {
 627         DWORD n;
 628         for (n = 0; n < ARRAY_Size(&HookModuleInfo->HookApis); ++n)
 629         {
 630             PHOOKAPIEX HookApi = *ARRAY_At(&HookModuleInfo->HookApis, PHOOKAPIEX, n);
 631             int CmpResult = strcmp(lpProcName, HookApi->FunctionName);
 632             if (CmpResult == 0)
 633             {
 634                 SHIMENG_MSG("Redirecting %p to %p\n", proc, HookApi->ReplacementFunction);
 635                 proc = HookApi->ReplacementFunction;
 636                 break;
 637             }
 638         }
 639     }
 640
 641     return proc;
 642 }
 643
 644 /* Walk all shim modules / enabled shims, and add their hooks */
 645 VOID SeiResolveAPIs(VOID)
 646 {
 647     DWORD mod, n;
 648
 649     /* Enumerate all Shim modules */
 650     for (mod = 0; mod < ARRAY_Size(&g_pShimInfo); ++mod)
 651     {
 652         PSHIMMODULE pShimModule = *ARRAY_At(&g_pShimInfo, PSHIMMODULE, mod);
 653         DWORD dwShimCount = ARRAY_Size(&pShimModule->EnabledShims);
 654
 655         /* Enumerate all Shims */
 656         for (n = 0; n < dwShimCount; ++n)
 657         {
 658             PSHIMINFO pShim = *ARRAY_At(&pShimModule->EnabledShims, PSHIMINFO, n);
 659
 660             PHOOKAPIEX hooks = pShim->pHookApi;
 661             DWORD dwHookCount = pShim->dwHookCount;
 662
 663             SeiAddHooks(hooks, dwHookCount, pShim);
 664         }
 665     }
 666 }
 667
 668 /* If we hooked something, we should also redirect GetProcAddress */
 669 VOID SeiAddInternalHooks(DWORD dwNumHooks)
 670 {
 671     if (dwNumHooks == 0)
 672     {
 673         g_bInternalHooksUsed = FALSE;
 674         return;
 675     }
 676
 677     SeiAddHooks(g_IntHookEx, ARRAYSIZE(g_IntHookEx), NULL);
 678     g_bInternalHooksUsed = TRUE;
 679 }
 680
 681 /* Patch one function in the iat */
 682 VOID SeiPatchNewImport(PIMAGE_THUNK_DATA FirstThunk, PHOOKAPIEX HookApi, PLDR_DATA_TABLE_ENTRY LdrEntry)
 683 {
 684     ULONG OldProtection = 0;
 685     PVOID Ptr;
 686     SIZE_T Size;
 687     NTSTATUS Status;
 688
 689     SHIMENG_INFO("Hooking API \"%s!%s\" for DLL \"%wZ\"\n", HookApi->LibraryName, HookApi->FunctionName, &LdrEntry->BaseDllName);
 690
 691     Ptr = &FirstThunk->u1.Function;
 692     Size = sizeof(FirstThunk->u1.Function);
 693     Status = NtProtectVirtualMemory(NtCurrentProcess(), &Ptr, &Size, PAGE_EXECUTE_READWRITE, &OldProtection);
 694
 695     if (!NT_SUCCESS(Status))
 696     {
 697         SHIMENG_FAIL("Unable to unprotect 0x%p\n", &FirstThunk->u1.Function);
 698         return;
 699     }
 700
 701     SHIMENG_INFO("changing 0x%p to 0x%p\n", FirstThunk->u1.Function, HookApi->ReplacementFunction);
 702 #ifdef _WIN64
 703     FirstThunk->u1.Function = (ULONGLONG)HookApi->ReplacementFunction;
 704 #else
 705     FirstThunk->u1.Function = (DWORD)HookApi->ReplacementFunction;
 706 #endif
 707
 708     Size = sizeof(FirstThunk->u1.Function);
 709     Status = NtProtectVirtualMemory(NtCurrentProcess(), &Ptr, &Size, OldProtection, &OldProtection);
 710
 711     if (!NT_SUCCESS(Status))
 712     {
 713         SHIMENG_WARN("Unable to reprotect 0x%p\n", &FirstThunk->u1.Function);
 714     }
 715 }
 716
 717
 718 PINEXCLUDE SeiFindInExclude(PARRAY InExclude, PCUNICODE_STRING DllName)
 719 {
 720     DWORD n;
 721
 722     for (n = 0; n < ARRAY_Size(InExclude); ++n)
 723     {
 724         PINEXCLUDE InEx = ARRAY_At(InExclude, INEXCLUDE, n);
 725
 726         if (RtlEqualUnicodeString(&InEx->Module, DllName, TRUE))
 727             return InEx;
 728     }
 729
 730     return NULL;
 731 }
 732
 733 BOOL SeiIsExcluded(PLDR_DATA_TABLE_ENTRY LdrEntry, PHOOKAPIEX HookApi)
 734 {
 735     PSHIMINFO pShimInfo = HookApi->pShimInfo;
 736     PINEXCLUDE InExclude;
 737     BOOL IsExcluded = FALSE;
 738
 739     if (!pShimInfo)
 740     {
 741         /* Internal hook, do not exclude it */
 742         return FALSE;
 743     }
 744
 745     /* By default, everything from System32 or WinSxs is excluded */
 746     if (RtlPrefixUnicodeString(&g_System32Directory, &LdrEntry->FullDllName, TRUE) ||
 747         RtlPrefixUnicodeString(&g_SxsDirectory, &LdrEntry->FullDllName, TRUE))
 748         IsExcluded = TRUE;
 749
 750     InExclude = SeiFindInExclude(&pShimInfo->InExclude, &LdrEntry->BaseDllName);
 751     if (InExclude)
 752     {
 753         /* If it is on the 'exclude' list, bail out */
 754         if (!InExclude->Include)
 755         {
 756             SHIMENG_INFO("Module '%wZ' excluded for shim %S, API '%s!%s', because it on in the exclude list.\n",
 757                          &LdrEntry->BaseDllName, pShimInfo->ShimName, HookApi->LibraryName, HookApi->FunctionName);
 758
 759             return TRUE;
 760         }
 761         /* If it is on the 'include' list, override System32 / Winsxs check. */
 762         if (IsExcluded)
 763         {
 764             SHIMENG_INFO("Module '%wZ' included for shim %S, API '%s!%s', because it is on the include list.\n",
 765                          &LdrEntry->BaseDllName, pShimInfo->ShimName, HookApi->LibraryName, HookApi->FunctionName);
 766
 767         }
 768         IsExcluded = FALSE;
 769     }
 770
 771     if (IsExcluded)
 772     {
 773         SHIMENG_INFO("Module '%wZ' excluded for shim %S, API '%s!%s', because it is in System32/WinSXS.\n",
 774                      &LdrEntry->BaseDllName, pShimInfo->ShimName, HookApi->LibraryName, HookApi->FunctionName);
 775     }
 776
 777     return IsExcluded;
 778 }
 779
 780 VOID SeiAppendInExclude(PARRAY dest, PCWSTR ModuleName, BOOL IsInclude)
 781 {
 782     PINEXCLUDE InExclude;
 783     UNICODE_STRING ModuleNameU;
 784     RtlInitUnicodeString(&ModuleNameU, ModuleName);
 785
 786     InExclude = SeiFindInExclude(dest, &ModuleNameU);
 787     if (InExclude)
 788     {
 789         InExclude->Include = IsInclude;
 790         return;
 791     }
 792
 793     InExclude = ARRAY_Append(dest, INEXCLUDE);
 794     if (InExclude)
 795     {
 796         PCWSTR ModuleNameCopy = SdbpStrDup(ModuleName);
 797         RtlInitUnicodeString(&InExclude->Module, ModuleNameCopy);
 798         InExclude->Include = IsInclude;
 799     }
 800 }
 801
 802 /* Read the INEXCLUD tags from a given parent tag */
 803 VOID SeiReadInExclude(PDB pdb, TAGID parent, PARRAY dest)
 804 {
 805     TAGID InExcludeTag;
 806
 807     InExcludeTag = SdbFindFirstTag(pdb, parent, TAG_INEXCLUD);
 808
 809     while (InExcludeTag != TAGID_NULL)
 810     {
 811         PCWSTR ModuleName;
 812         TAGID ModuleTag = SdbFindFirstTag(pdb, InExcludeTag, TAG_MODULE);
 813         TAGID IncludeTag = SdbFindFirstTag(pdb, InExcludeTag, TAG_INCLUDE);
 814
 815         ModuleName = SdbGetStringTagPtr(pdb, ModuleTag);
 816         if (ModuleName)
 817         {
 818             SeiAppendInExclude(dest, ModuleName, IncludeTag != TAGID_NULL);
 819         }
 820         else
 821         {
 822             SHIMENG_WARN("INEXCLUDE without Module: 0x%x\n", InExcludeTag);
 823         }
 824
 825         InExcludeTag = SdbFindNextTag(pdb, parent, InExcludeTag);
 826     }
 827 }
 828
 829 VOID SeiBuildGlobalInclExclList(HSDB hsdb)
 830 {
 831     PDB pdb;
 832     TAGREF tr = TAGREF_ROOT;
 833     TAGID root, db, library;
 834
 835     if (!SdbTagRefToTagID(hsdb, tr, &pdb, &root))
 836     {
 837         SHIMENG_WARN("Unable to resolve database root\n");
 838         return;
 839     }
 840     db = SdbFindFirstTag(pdb, root, TAG_DATABASE);
 841     if (db == TAGID_NULL)
 842     {
 843         SHIMENG_WARN("Unable to resolve database\n");
 844         return;
 845     }
 846     library = SdbFindFirstTag(pdb, db, TAG_LIBRARY);
 847     if (library == TAGID_NULL)
 848     {
 849         SHIMENG_WARN("Unable to resolve library\n");
 850         return;
 851     }
 852
 853     SeiReadInExclude(pdb, library, &g_InExclude);
 854 }
 855
 856 VOID SeiBuildInclExclList(PDB pdb, TAGID ShimTag, PSHIMINFO pShimInfo)
 857 {
 858     DWORD n;
 859
 860     /* First duplicate the global in/excludes */
 861     for (n = 0; n < ARRAY_Size(&g_InExclude); ++n)
 862     {
 863         PINEXCLUDE InEx = ARRAY_At(&g_InExclude, INEXCLUDE, n);
 864         SeiAppendInExclude(&pShimInfo->InExclude, InEx->Module.Buffer, InEx->Include);
 865     }
 866
 867     /* Now read this shim's in/excludes (possibly overriding the global ones) */
 868     SeiReadInExclude(pdb, ShimTag, &pShimInfo->InExclude);
 869 }
 870
 871 /* Given one loaded module, redirect (hook) all functions from the iat that are registered by shims */
 872 VOID SeiHookImports(PLDR_DATA_TABLE_ENTRY LdrEntry)
 873 {
 874     ULONG Size;
 875     PIMAGE_IMPORT_DESCRIPTOR ImportDescriptor;
 876     PBYTE DllBase = LdrEntry->DllBase;
 877
 878     if (SE_IsShimDll(DllBase) ||
 879         g_hInstance == LdrEntry->DllBase ||
 880         RtlEqualUnicodeString(&g_LoadingShimDll, &LdrEntry->BaseDllName, TRUE))
 881     {
 882         SHIMENG_INFO("Skipping shim module 0x%p \"%wZ\"\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
 883         return;
 884     }
 885
 886     if (LdrEntry->Flags & LDRP_COMPAT_DATABASE_PROCESSED)
 887     {
 888         SHIMENG_INFO("Skipping module 0x%p \"%wZ\" because it was already processed\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
 889         return;
 890     }
 891
 892     ImportDescriptor = RtlImageDirectoryEntryToData(DllBase, TRUE, IMAGE_DIRECTORY_ENTRY_IMPORT, &Size);
 893     if (!ImportDescriptor)
 894     {
 895         SHIMENG_INFO("Skipping module 0x%p \"%wZ\" due to no iat found\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
 896         return;
 897     }
 898
 899     SHIMENG_INFO("Hooking module 0x%p \"%wZ\"\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
 900
 901     for ( ;ImportDescriptor->Name && ImportDescriptor->OriginalFirstThunk; ImportDescriptor++)
 902     {
 903         PHOOKMODULEINFO HookModuleInfo;
 904
 905         /* Do we have hooks for this module? */
 906         HookModuleInfo = SeiFindHookModuleInfoForImportDescriptor(DllBase, ImportDescriptor);
 907
 908         if (HookModuleInfo)
 909         {
 910             PIMAGE_THUNK_DATA OriginalThunk, FirstThunk;
 911             DWORD n;
 912
 913             for (n = 0; n < ARRAY_Size(&HookModuleInfo->HookApis); ++n)
 914             {
 915                 DWORD dwFound = 0;
 916                 PHOOKAPIEX HookApi = *ARRAY_At(&HookModuleInfo->HookApis, PHOOKAPIEX, n);
 917
 918                 /* Check if this module should be excluded from being hooked (system32/winsxs, global or shim exclude) */
 919                 if (SeiIsExcluded(LdrEntry, HookApi))
 920                 {
 921                     continue;
 922                 }
 923
 924                 OriginalThunk = (PIMAGE_THUNK_DATA)(DllBase + ImportDescriptor->OriginalFirstThunk);
 925                 FirstThunk = (PIMAGE_THUNK_DATA)(DllBase + ImportDescriptor->FirstThunk);
 926
 927                 /* Walk all imports */
 928                 for (;OriginalThunk->u1.AddressOfData && FirstThunk->u1.Function; OriginalThunk++, FirstThunk++)
 929                 {
 930                     if (!IMAGE_SNAP_BY_ORDINAL32(OriginalThunk->u1.AddressOfData))
 931                     {
 932                         PIMAGE_IMPORT_BY_NAME ImportName;
 933
 934                         ImportName = (PIMAGE_IMPORT_BY_NAME)(DllBase + OriginalThunk->u1.AddressOfData);
 935                         if (!strcmp((PCSTR)ImportName->Name, HookApi->FunctionName))
 936                         {
 937                             SeiPatchNewImport(FirstThunk, HookApi, LdrEntry);
 938
 939                             /* Sadly, iat does not have to be sorted, and can even contain duplicate entries. */
 940                             dwFound++;
 941                         }
 942                     }
 943                     else
 944                     {
 945                         SHIMENG_FAIL("Ordinals not yet supported\n");
 946                         ASSERT(0);
 947                     }
 948                 }
 949
 950                 if (dwFound != 1)
 951                 {
 952                     /* One entry not found. */
 953                     if (!dwFound)
 954                         SHIMENG_INFO("Entry \"%s!%s\" not found for \"%wZ\"\n", HookApi->LibraryName, HookApi->FunctionName, &LdrEntry->BaseDllName);
 955                     else
 956                         SHIMENG_INFO("Entry \"%s!%s\" found %d times for \"%wZ\"\n", HookApi->LibraryName, HookApi->FunctionName, dwFound, &LdrEntry->BaseDllName);
 957                 }
 958             }
 959         }
 960     }
 961
 962     /* Mark this module as processed. */
 963     LdrEntry->Flags |= LDRP_COMPAT_DATABASE_PROCESSED;
 964 }
 965
 966
 967 VOID PatchNewModules(PPEB Peb)
 968 {
 969     PLIST_ENTRY ListHead, ListEntry;
 970     PLDR_DATA_TABLE_ENTRY LdrEntry;
 971
 972     ListHead = &NtCurrentPeb()->Ldr->InLoadOrderModuleList;
 973     ListEntry = ListHead->Flink;
 974
 975     while (ListHead != ListEntry)
 976     {
 977         LdrEntry = CONTAINING_RECORD(ListEntry, LDR_DATA_TABLE_ENTRY, InLoadOrderLinks);
 978         SeiHookImports(LdrEntry);
 979
 980         ListEntry = ListEntry->Flink;
 981     }
 982 }
 983
 984
 985 VOID SeiInitPaths(VOID)
 986 {
 987 #define SYSTEM32  L"\\system32"
 988 #define WINSXS  L"\\winsxs"
 989
 990     PWSTR WindowsDirectory = SdbpStrDup(SharedUserData->NtSystemRoot);
 991     RtlInitUnicodeString(&g_WindowsDirectory, WindowsDirectory);
 992
 993     g_System32Directory.MaximumLength = g_WindowsDirectory.Length + SdbpStrsize(SYSTEM32);
 994     g_System32Directory.Buffer = SdbpAlloc(g_System32Directory.MaximumLength);
 995     RtlCopyUnicodeString(&g_System32Directory, &g_WindowsDirectory);
 996     RtlAppendUnicodeToString(&g_System32Directory, SYSTEM32);
 997
 998     g_SxsDirectory.MaximumLength = g_WindowsDirectory.Length + SdbpStrsize(WINSXS);
 999     g_SxsDirectory.Buffer = SdbpAlloc(g_SxsDirectory.MaximumLength);
1000     RtlCopyUnicodeString(&g_SxsDirectory, &g_WindowsDirectory);
1001     RtlAppendUnicodeToString(&g_SxsDirectory, WINSXS);
1002
1003 #undef SYSTEM32
1004 #undef WINSXS
1005 }
1006
1007 VOID SeiSetEntryProcessed(PPEB Peb)
1008 {
1009     PLIST_ENTRY ListHead, Entry;
1010     PLDR_DATA_TABLE_ENTRY LdrEntry;
1011
1012     ListHead = &NtCurrentPeb()->Ldr->InInitializationOrderModuleList;
1013     Entry = ListHead->Flink;
1014     while (Entry != ListHead)
1015     {
1016         LdrEntry = CONTAINING_RECORD(Entry, LDR_DATA_TABLE_ENTRY, InInitializationOrderLinks);
1017         Entry = Entry->Flink;
1018
1019         if (RtlEqualUnicodeString(&LdrEntry->BaseDllName, &Ntdll, TRUE) ||
1020             RtlEqualUnicodeString(&LdrEntry->BaseDllName, &Kernel32, TRUE) ||
1021             RtlEqualUnicodeString(&LdrEntry->BaseDllName, &Verifier, TRUE) ||
1022             RtlEqualUnicodeString(&LdrEntry->BaseDllName, &g_LoadingShimDll, TRUE) ||
1023             SE_IsShimDll(LdrEntry->DllBase) ||
1024             (LdrEntry->Flags & LDRP_ENTRY_PROCESSED))
1025         {
1026             SHIMENG_WARN("Don't mess with 0x%p '%wZ'\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
1027         }
1028         else
1029         {
1030             SHIMENG_WARN("Touching        0x%p '%wZ'\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
1031             LdrEntry->Flags |= (LDRP_ENTRY_PROCESSED | LDRP_SHIMENG_SUPPRESSED_ENTRY);
1032         }
1033     }
1034
1035     ListHead = &NtCurrentPeb()->Ldr->InMemoryOrderModuleList;
1036     Entry = ListHead->Flink;
1037     SHIMENG_INFO("In memory:\n");
1038     while (Entry != ListHead)
1039     {
1040         LdrEntry = CONTAINING_RECORD(Entry, LDR_DATA_TABLE_ENTRY, InMemoryOrderLinks);
1041         Entry = Entry->Flink;
1042
1043         SHIMENG_INFO("    0x%p '%wZ'\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
1044     }
1045
1046     ListHead = &NtCurrentPeb()->Ldr->InLoadOrderModuleList;
1047     Entry = ListHead->Flink;
1048     SHIMENG_INFO("In load:\n");
1049     while (Entry != ListHead)
1050     {
1051         LdrEntry = CONTAINING_RECORD(Entry, LDR_DATA_TABLE_ENTRY, InLoadOrderLinks);
1052         Entry = Entry->Flink;
1053
1054         SHIMENG_INFO("    0x%p '%wZ'\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
1055     }
1056 }
1057
1058 VOID SeiResetEntryProcessed(PPEB Peb)
1059 {
1060     PLIST_ENTRY ListHead, Entry;
1061     PLDR_DATA_TABLE_ENTRY LdrEntry;
1062
1063     ListHead = &NtCurrentPeb()->Ldr->InInitializationOrderModuleList;
1064     Entry = ListHead->Flink;
1065     while (Entry != ListHead)
1066     {
1067         LdrEntry = CONTAINING_RECORD(Entry, LDR_DATA_TABLE_ENTRY, InInitializationOrderLinks);
1068         Entry = Entry->Flink;
1069
1070         if (SE_IsShimDll(LdrEntry->DllBase) ||
1071             g_hInstance == LdrEntry->DllBase ||
1072             RtlEqualUnicodeString(&LdrEntry->BaseDllName, &Ntdll, TRUE) ||
1073             RtlEqualUnicodeString(&LdrEntry->BaseDllName, &Kernel32, TRUE) ||
1074             RtlEqualUnicodeString(&LdrEntry->BaseDllName, &Verifier, TRUE) ||
1075             !(LdrEntry->Flags & LDRP_SHIMENG_SUPPRESSED_ENTRY))
1076         {
1077             SHIMENG_WARN("Don't mess with 0x%p '%wZ'\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
1078         }
1079         else
1080         {
1081             SHIMENG_WARN("Resetting       0x%p '%wZ'\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
1082             LdrEntry->Flags &= ~(LDRP_ENTRY_PROCESSED | LDRP_SHIMENG_SUPPRESSED_ENTRY);
1083         }
1084     }
1085 }
1086
1087 VOID SeiInit(PUNICODE_STRING ProcessImage, HSDB hsdb, SDBQUERYRESULT* pQuery)
1088 {
1089     DWORD n;
1090     ARRAY ShimRefArray;
1091     DWORD dwTotalHooks = 0;
1092     FLAGINFO ShimFlags;
1093
1094     PPEB Peb = NtCurrentPeb();
1095
1096     /* We should only be called once! */
1097     ASSERT(g_pShimInfo.ItemSize__ == 0);
1098
1099     ARRAY_Init(&ShimRefArray, TAGREF);
1100     ARRAY_Init(&g_pShimInfo, PSHIMMODULE);
1101     ARRAY_Init(&g_pHookArray, HOOKMODULEINFO);
1102     ARRAY_Init(&g_InExclude, INEXCLUDE);
1103     RtlZeroMemory(&ShimFlags, sizeof(ShimFlags));
1104
1105     SeiInitPaths();
1106
1107     SeiCheckComPlusImage(Peb->ImageBaseAddress);
1108
1109     /* Mark all modules loaded until now as 'LDRP_ENTRY_PROCESSED' so that their entrypoint is not called while we are loading shims */
1110     SeiSetEntryProcessed(Peb);
1111
1112     /* TODO:
1113     if (pQuery->trApphelp)
1114         SeiDisplayAppHelp(?pQuery->trApphelp?);
1115     */
1116
1117     SeiDbgPrint(SEI_MSG, NULL, "ShimInfo(ExePath(%wZ))\n", ProcessImage);
1118     SeiBuildShimRefArray(hsdb, pQuery, &ShimRefArray, &ShimFlags);
1119     if (ShimFlags.AppCompatFlags.QuadPart)
1120     {
1121         SeiDbgPrint(SEI_MSG, NULL, "Using KERNEL apphack flags 0x%I64x\n", ShimFlags.AppCompatFlags.QuadPart);
1122         Peb->AppCompatFlags.QuadPart |= ShimFlags.AppCompatFlags.QuadPart;
1123     }
1124     if (ShimFlags.AppCompatFlagsUser.QuadPart)
1125     {
1126         SeiDbgPrint(SEI_MSG, NULL, "Using USER apphack flags 0x%I64x\n", ShimFlags.AppCompatFlagsUser.QuadPart);
1127         Peb->AppCompatFlagsUser.QuadPart |= ShimFlags.AppCompatFlagsUser.QuadPart;
1128     }
1129     if (ShimFlags.ProcessParameters_Flags)
1130     {
1131         SeiDbgPrint(SEI_MSG, NULL, "Using ProcessParameters flags 0x%x\n", ShimFlags.ProcessParameters_Flags);
1132         Peb->ProcessParameters->Flags |= ShimFlags.ProcessParameters_Flags;
1133     }
1134     SeiDbgPrint(SEI_MSG, NULL, "ShimInfo(Complete)\n");
1135
1136     SHIMENG_INFO("Got %d shims\n", ARRAY_Size(&ShimRefArray));
1137     SeiBuildGlobalInclExclList(hsdb);
1138
1139     /* Walk all shims referenced (in layers + exes), and load their modules */
1140     for (n = 0; n < ARRAY_Size(&ShimRefArray); ++n)
1141     {
1142         PDB pdb;
1143         TAGID ShimRef;
1144
1145         TAGREF tr = *ARRAY_At(&ShimRefArray, TAGREF, n);
1146
1147         if (SdbTagRefToTagID(hsdb, tr, &pdb, &ShimRef))
1148         {
1149             LPCWSTR ShimName, DllName, CommandLine = NULL;
1150             TAGID ShimTag;
1151             WCHAR FullNameBuffer[MAX_PATH];
1152             UNICODE_STRING UnicodeDllName;
1153             PVOID BaseAddress;
1154             PSHIMMODULE pShimModuleInfo = NULL;
1155             ANSI_STRING AnsiCommandLine = RTL_CONSTANT_STRING("");
1156             PSHIMINFO pShimInfo = NULL;
1157             PHOOKAPIEX pHookApi;
1158             DWORD dwHookCount;
1159
1160             ShimName = SeiGetStringPtr(pdb, ShimRef, TAG_NAME);
1161             if (!ShimName)
1162             {
1163                 SHIMENG_FAIL("Failed to retrieve the name for 0x%x\n", tr);
1164                 continue;
1165             }
1166
1167             CommandLine = SeiGetStringPtr(pdb, ShimRef, TAG_COMMAND_LINE);
1168             if (CommandLine && *CommandLine)
1169             {
1170                 RtlInitUnicodeString(&UnicodeDllName, CommandLine);
1171                 if (NT_SUCCESS(RtlUnicodeStringToAnsiString(&AnsiCommandLine, &UnicodeDllName, TRUE)))
1172                 {
1173                     SHIMENG_INFO("COMMAND LINE %s for %S", AnsiCommandLine.Buffer, ShimName);
1174                 }
1175                 else
1176                 {
1177                     AnsiCommandLine.Buffer = "";
1178                     CommandLine = NULL;
1179                 }
1180             }
1181
1182             ShimTag = SeiGetDWORD(pdb, ShimRef, TAG_SHIM_TAGID);
1183             if (!ShimTag)
1184             {
1185                 SHIMENG_FAIL("Failed to resolve %S to a shim\n", ShimName);
1186                 continue;
1187             }
1188
1189             if (!SUCCEEDED(SdbGetAppPatchDir(NULL, FullNameBuffer, ARRAYSIZE(FullNameBuffer))))
1190             {
1191                 SHIMENG_WARN("Failed to get the AppPatch dir\n");
1192                 continue;
1193             }
1194
1195             DllName = SeiGetStringPtr(pdb, ShimTag, TAG_DLLFILE);
1196             if (DllName == NULL ||
1197                 !SUCCEEDED(StringCchCatW(FullNameBuffer, ARRAYSIZE(FullNameBuffer), L"\\")) ||
1198                 !SUCCEEDED(StringCchCatW(FullNameBuffer, ARRAYSIZE(FullNameBuffer), DllName)))
1199             {
1200                 SHIMENG_WARN("Failed to build a full path for %S\n", ShimName);
1201                 continue;
1202             }
1203
1204             RtlInitUnicodeString(&g_LoadingShimDll, DllName);
1205             RtlInitUnicodeString(&UnicodeDllName, FullNameBuffer);
1206             if (NT_SUCCESS(LdrGetDllHandle(NULL, NULL, &UnicodeDllName, &BaseAddress)))
1207             {
1208                 /* This shim dll was already loaded, let's find it */
1209                 pShimModuleInfo = SeiGetShimModuleInfo(BaseAddress);
1210             }
1211             else if (!NT_SUCCESS(LdrLoadDll(NULL, NULL, &UnicodeDllName, &BaseAddress)))
1212             {
1213                 SHIMENG_WARN("Failed to load %wZ for %S\n", &UnicodeDllName, ShimName);
1214                 continue;
1215             }
1216             RtlInitUnicodeString(&g_LoadingShimDll, NULL);
1217             /* No shim module found (or we just loaded it) */
1218             if (!pShimModuleInfo)
1219             {
1220                 pShimModuleInfo = SeiCreateShimModuleInfo(DllName, BaseAddress);
1221                 if (!pShimModuleInfo)
1222                 {
1223                     SHIMENG_FAIL("Failed to allocate ShimInfo for %S\n", DllName);
1224                     continue;
1225                 }
1226             }
1227
1228             SHIMENG_INFO("Shim DLL 0x%p \"%wZ\" loaded\n", BaseAddress, &UnicodeDllName);
1229             SHIMENG_INFO("Using SHIM \"%S!%S\"\n", DllName, ShimName);
1230
1231             /* Ask this shim what hooks it needs (and pass along the commandline) */
1232             dwHookCount = 0;
1233             pHookApi = pShimModuleInfo->pGetHookAPIs(AnsiCommandLine.Buffer, ShimName, &dwHookCount);
1234             SHIMENG_INFO("GetHookAPIs returns %d hooks for DLL \"%wZ\" SHIM \"%S\"\n", dwHookCount, &UnicodeDllName, ShimName);
1235             if (dwHookCount && pHookApi)
1236                 pShimInfo = SeiAppendHookInfo(pShimModuleInfo, pHookApi, dwHookCount, ShimName);
1237             else
1238                 dwHookCount = 0;
1239
1240             /* If this shim has hooks, create the include / exclude lists */
1241             if (pShimInfo)
1242                 SeiBuildInclExclList(pdb, ShimTag, pShimInfo);
1243
1244             if (CommandLine && *CommandLine)
1245                 RtlFreeAnsiString(&AnsiCommandLine);
1246
1247             dwTotalHooks += dwHookCount;
1248         }
1249     }
1250
1251     SeiAddInternalHooks(dwTotalHooks);
1252     SeiResolveAPIs();
1253     PatchNewModules(Peb);
1254
1255     /* Remove the 'LDRP_ENTRY_PROCESSED' flag from entries we modified, so that the loader can continue to process them */
1256     SeiResetEntryProcessed(Peb);
1257 }
1258
1259
1260 /* Load the database + unpack the shim data (if this process is allowed) */
1261 BOOL SeiGetShimData(PUNICODE_STRING ProcessImage, PVOID pShimData, HSDB* pHsdb, SDBQUERYRESULT* pQuery)
1262 {
1263     static const UNICODE_STRING ForbiddenShimmingApps[] = {
1264         RTL_CONSTANT_STRING(L"ntsd.exe"),
1265         RTL_CONSTANT_STRING(L"windbg.exe"),
1266 #if WINVER >= 0x600
1267         RTL_CONSTANT_STRING(L"slsvc.exe"),
1268 #endif
1269     };
1270     static const UNICODE_STRING BackSlash = RTL_CONSTANT_STRING(L"\\");
1271     static const UNICODE_STRING ForwdSlash = RTL_CONSTANT_STRING(L"/");
1272     UNICODE_STRING ProcessName;
1273     USHORT Back, Forward;
1274     HSDB hsdb;
1275     DWORD n;
1276
1277     if (!NT_SUCCESS(RtlFindCharInUnicodeString(RTL_FIND_CHAR_IN_UNICODE_STRING_START_AT_END, ProcessImage, &BackSlash, &Back)))
1278         Back = 0;
1279
1280     if (!NT_SUCCESS(RtlFindCharInUnicodeString(RTL_FIND_CHAR_IN_UNICODE_STRING_START_AT_END, ProcessImage, &ForwdSlash, &Forward)))
1281         Forward = 0;
1282
1283     if (Back < Forward)
1284         Back = Forward;
1285
1286     if (Back)
1287         Back += sizeof(WCHAR);
1288
1289     ProcessName.Buffer = ProcessImage->Buffer + Back / sizeof(WCHAR);
1290     ProcessName.Length = ProcessImage->Length - Back;
1291     ProcessName.MaximumLength = ProcessImage->MaximumLength - Back;
1292
1293     for (n = 0; n < ARRAYSIZE(ForbiddenShimmingApps); ++n)
1294     {
1295         if (RtlEqualUnicodeString(&ProcessName, ForbiddenShimmingApps + n, TRUE))
1296         {
1297             SHIMENG_MSG("Not shimming %wZ\n", ForbiddenShimmingApps + n);
1298             return FALSE;
1299         }
1300     }
1301
1302     /* We should probably load all db's here, but since we do not support that yet... */
1303     hsdb = SdbInitDatabase(HID_DOS_PATHS | SDB_DATABASE_MAIN_SHIM, NULL);
1304     if (hsdb)
1305     {
1306         if (SdbUnpackAppCompatData(hsdb, ProcessImage->Buffer, pShimData, pQuery))
1307         {
1308             *pHsdb = hsdb;
1309             return TRUE;
1310         }
1311         SdbReleaseDatabase(hsdb);
1312     }
1313     return FALSE;
1314 }
1315
1316
1317
1318 VOID NTAPI SE_InstallBeforeInit(PUNICODE_STRING ProcessImage, PVOID pShimData)
1319 {
1320     HSDB hsdb = NULL;
1321     SDBQUERYRESULT QueryResult = { { 0 } };
1322     SHIMENG_INFO("(%wZ, %p)\n", ProcessImage, pShimData);
1323
1324     if (!SeiGetShimData(ProcessImage, pShimData, &hsdb, &QueryResult))
1325     {
1326         SHIMENG_FAIL("Failed to get shim data\n");
1327         return;
1328     }
1329
1330     g_bShimDuringInit = TRUE;
1331     SeiInit(ProcessImage, hsdb, &QueryResult);
1332     g_bShimDuringInit = FALSE;
1333
1334     SdbReleaseDatabase(hsdb);
1335 }
1336
1337 VOID NTAPI SE_InstallAfterInit(PUNICODE_STRING ProcessImage, PVOID pShimData)
1338 {
1339     NotifyShims(SHIM_NOTIFY_ATTACH, NULL);
1340 }
1341
1342 VOID NTAPI SE_ProcessDying(VOID)
1343 {
1344     SHIMENG_MSG("()\n");
1345     NotifyShims(SHIM_NOTIFY_DETACH, NULL);
1346 }
1347
1348 VOID WINAPI SE_DllLoaded(PLDR_DATA_TABLE_ENTRY LdrEntry)
1349 {
1350     SHIMENG_INFO("%sINIT. loading DLL \"%wZ\"\n", g_bShimDuringInit ? "" : "AFTER ", &LdrEntry->BaseDllName);
1351
1352     SeiHookImports(LdrEntry);
1353
1354     NotifyShims(SHIM_REASON_DLL_LOAD, LdrEntry);
1355 }
1356
1357 VOID WINAPI SE_DllUnloaded(PLDR_DATA_TABLE_ENTRY LdrEntry)
1358 {
1359     SHIMENG_INFO("(%p)\n", LdrEntry);
1360
1361     /* Should we unhook here? */
1362
1363     NotifyShims(SHIM_REASON_DLL_UNLOAD, LdrEntry);
1364 }
1365
1366 BOOL WINAPI SE_IsShimDll(PVOID BaseAddress)
1367 {
1368     SHIMENG_INFO("(%p)\n", BaseAddress);
1369
1370     return SeiGetShimModuleInfo(BaseAddress) != NULL;
1371 }
1372