ntoskrnl/cm/regobj.c

   1 /*
   2  * COPYRIGHT:        See COPYING in the top level directory
   3  * PROJECT:          ReactOS kernel
   4  * FILE:             ntoskrnl/cm/regobj.c
   5  * PURPOSE:          Registry object manipulation routines.
   6  * UPDATE HISTORY:
   7 */
   8
   9 #ifdef WIN32_REGDBG
  10 #include "cm_win32.h"
  11 #else
  12 #include <ddk/ntddk.h>
  13 #include <roscfg.h>
  14 #include <internal/ob.h>
  15 #include <limits.h>
  16 #include <string.h>
  17 #include <internal/pool.h>
  18 #include <internal/registry.h>
  19 #include <ntos/minmax.h>
  20
  21 #define NDEBUG
  22 #include <internal/debug.h>
  23
  24 #include "cm.h"
  25 #endif
  26
  27
  28 static NTSTATUS
  29 CmiGetLinkTarget(PREGISTRY_HIVE RegistryHive,
  30                  PKEY_CELL KeyCell,
  31                  PUNICODE_STRING TargetPath);
  32
  33 /* FUNCTONS *****************************************************************/
  34
  35 NTSTATUS STDCALL
  36 CmiObjectParse(PVOID ParsedObject,
  37                PVOID *NextObject,
  38                PUNICODE_STRING FullPath,
  39                PWSTR *Path,
  40                ULONG Attributes)
  41 {
  42   BLOCK_OFFSET BlockOffset;
  43   PKEY_OBJECT FoundObject;
  44   PKEY_OBJECT ParsedKey;
  45   PKEY_CELL SubKeyCell;
  46   CHAR cPath[MAX_PATH];
  47   NTSTATUS Status;
  48   PWSTR StartPtr;
  49   PWSTR EndPtr;
  50   ULONG Length;
  51   UNICODE_STRING LinkPath;
  52   UNICODE_STRING TargetPath;
  53
  54   ParsedKey = ParsedObject;
  55
  56   VERIFY_KEY_OBJECT(ParsedKey);
  57
  58   *NextObject = NULL;
  59
  60   if ((*Path) == NULL)
  61     {
  62       DPRINT("*Path is NULL\n");
  63       return STATUS_UNSUCCESSFUL;
  64     }
  65
  66   DPRINT("Path '%S'\n", *Path);
  67
  68   /* Extract relevant path name */
  69   StartPtr = *Path;
  70   if (*StartPtr == L'\\')
  71     StartPtr++;
  72
  73   EndPtr = wcschr(StartPtr, L'\\');
  74   if (EndPtr != NULL)
  75     Length = ((PCHAR)EndPtr - (PCHAR)StartPtr) / sizeof(WCHAR);
  76   else
  77     Length = wcslen(StartPtr);
  78
  79   wcstombs(cPath, StartPtr, Length);
  80   cPath[Length] = 0;
  81
  82
  83   FoundObject = CmiScanKeyList(ParsedKey, cPath, Attributes);
  84   if (FoundObject == NULL)
  85     {
  86       Status = CmiScanForSubKey(ParsedKey->RegistryHive,
  87                                 ParsedKey->KeyCell,
  88                                 &SubKeyCell,
  89                                 &BlockOffset,
  90                                 cPath,
  91                                 0,
  92                                 Attributes);
  93       if (!NT_SUCCESS(Status) || (SubKeyCell == NULL))
  94         {
  95           return(STATUS_UNSUCCESSFUL);
  96         }
  97
  98       if ((SubKeyCell->Type == REG_LINK_KEY_CELL_TYPE) &&
  99           !((Attributes & OBJ_OPENLINK) && (EndPtr == NULL) /*(end == NULL)*/))
 100         {
 101           RtlInitUnicodeString(&LinkPath, NULL);
 102           Status = CmiGetLinkTarget(ParsedKey->RegistryHive,
 103                                     SubKeyCell,
 104                                     &LinkPath);
 105           if (NT_SUCCESS(Status))
 106             {
 107               DPRINT("LinkPath '%wZ'\n", &LinkPath);
 108
 109               /* build new FullPath for reparsing */
 110               TargetPath.MaximumLength = LinkPath.MaximumLength;
 111               if (EndPtr != NULL)
 112                 {
 113                   TargetPath.MaximumLength += (wcslen(EndPtr) * sizeof(WCHAR));
 114                 }
 115               TargetPath.Length = TargetPath.MaximumLength - sizeof(WCHAR);
 116               TargetPath.Buffer = ExAllocatePool(NonPagedPool,
 117                                                  TargetPath.MaximumLength);
 118               wcscpy(TargetPath.Buffer, LinkPath.Buffer);
 119               if (EndPtr != NULL)
 120                 {
 121                   wcscat(TargetPath.Buffer, EndPtr);
 122                 }
 123
 124               RtlFreeUnicodeString(FullPath);
 125               RtlFreeUnicodeString(&LinkPath);
 126               FullPath->Length = TargetPath.Length;
 127               FullPath->MaximumLength = TargetPath.MaximumLength;
 128               FullPath->Buffer = TargetPath.Buffer;
 129
 130               DPRINT("FullPath '%wZ'\n", FullPath);
 131
 132               /* reinitialize Path for reparsing */
 133               *Path = FullPath->Buffer;
 134
 135               *NextObject = NULL;
 136               return(STATUS_REPARSE);
 137             }
 138         }
 139
 140       /* Create new key object and put into linked list */
 141       DPRINT("CmiObjectParse: %s\n", cPath);
 142       Status = ObCreateObject(NULL,
 143                               STANDARD_RIGHTS_REQUIRED,
 144                               NULL,
 145                               CmiKeyType,
 146                               (PVOID*)&FoundObject);
 147       if (!NT_SUCCESS(Status))
 148         {
 149           return(Status);
 150         }
 151
 152       FoundObject->Flags = 0;
 153       FoundObject->Name = SubKeyCell->Name;
 154       FoundObject->NameSize = SubKeyCell->NameSize;
 155       FoundObject->KeyCell = SubKeyCell;
 156       FoundObject->BlockOffset = BlockOffset;
 157       FoundObject->RegistryHive = ParsedKey->RegistryHive;
 158       CmiAddKeyToList(ParsedKey, FoundObject);
 159       DPRINT("Created object 0x%x\n", FoundObject);
 160     }
 161   else
 162     {
 163       if ((FoundObject->KeyCell->Type == REG_LINK_KEY_CELL_TYPE) &&
 164           !((Attributes & OBJ_OPENLINK) && (EndPtr == NULL)/*(end == NULL)*/))
 165         {
 166           DPRINT("Found link\n");
 167
 168           RtlInitUnicodeString(&LinkPath, NULL);
 169           Status = CmiGetLinkTarget(FoundObject->RegistryHive,
 170                                     FoundObject->KeyCell,
 171                                     &LinkPath);
 172           if (NT_SUCCESS(Status))
 173             {
 174               DPRINT("LinkPath '%wZ'\n", &LinkPath);
 175
 176               /* build new FullPath for reparsing */
 177               TargetPath.MaximumLength = LinkPath.MaximumLength;
 178               if (EndPtr != NULL)
 179                 {
 180                   TargetPath.MaximumLength += (wcslen(EndPtr) * sizeof(WCHAR));
 181                 }
 182               TargetPath.Length = TargetPath.MaximumLength - sizeof(WCHAR);
 183               TargetPath.Buffer = ExAllocatePool(NonPagedPool,
 184                                                  TargetPath.MaximumLength);
 185               wcscpy(TargetPath.Buffer, LinkPath.Buffer);
 186               if (EndPtr != NULL)
 187                 {
 188                   wcscat(TargetPath.Buffer, EndPtr);
 189                 }
 190
 191               RtlFreeUnicodeString(FullPath);
 192               RtlFreeUnicodeString(&LinkPath);
 193               FullPath->Length = TargetPath.Length;
 194               FullPath->MaximumLength = TargetPath.MaximumLength;
 195               FullPath->Buffer = TargetPath.Buffer;
 196
 197               DPRINT("FullPath '%wZ'\n", FullPath);
 198
 199               /* reinitialize Path for reparsing */
 200               *Path = FullPath->Buffer;
 201
 202               *NextObject = NULL;
 203               return(STATUS_REPARSE);
 204             }
 205         }
 206
 207       ObReferenceObjectByPointer(FoundObject,
 208                                  STANDARD_RIGHTS_REQUIRED,
 209                                  NULL,
 210                                  UserMode);
 211     }
 212 #ifndef WIN32_REGDBG
 213   DPRINT("CmiObjectParse: %s\n", FoundObject->Name);
 214 #else
 215   {
 216       char buffer[_BUFFER_LEN];
 217       memset(buffer, 0, _BUFFER_LEN);
 218       strncpy(buffer, FoundObject->Name, min(FoundObject->NameSize, _BUFFER_LEN - 1));
 219       DPRINT("CmiObjectParse: %s\n", buffer);
 220   }
 221 #endif
 222
 223   *Path = EndPtr;
 224
 225   VERIFY_KEY_OBJECT(FoundObject);
 226
 227   *NextObject = FoundObject;
 228
 229   return(STATUS_SUCCESS);
 230 }
 231
 232
 233 NTSTATUS STDCALL
 234 CmiObjectCreate(PVOID ObjectBody,
 235                 PVOID Parent,
 236                 PWSTR RemainingPath,
 237                 struct _OBJECT_ATTRIBUTES* ObjectAttributes)
 238 {
 239   PKEY_OBJECT pKey = ObjectBody;
 240
 241   pKey->ParentKey = Parent;
 242   if (RemainingPath)
 243     {
 244       if(RemainingPath[0]== L'\\')
 245         {
 246           pKey->Name = (PCHAR)(&RemainingPath[1]);
 247           pKey->NameSize = wcslen(RemainingPath) - 1;
 248         }
 249       else
 250         {
 251           pKey->Name = (PCHAR)RemainingPath;
 252           pKey->NameSize = wcslen(RemainingPath);
 253         }
 254     }
 255    else
 256     {
 257       pKey->NameSize = 0;
 258     }
 259
 260   return STATUS_SUCCESS;
 261 }
 262
 263
 264 VOID STDCALL
 265 CmiObjectDelete(PVOID DeletedObject)
 266 {
 267   PKEY_OBJECT KeyObject;
 268
 269   DPRINT("Delete object key\n");
 270
 271   KeyObject = (PKEY_OBJECT) DeletedObject;
 272
 273   if (!NT_SUCCESS(CmiRemoveKeyFromList(KeyObject)))
 274     {
 275       DPRINT1("Key not found in parent list ???\n");
 276     }
 277
 278   if (KeyObject->Flags & KO_MARKED_FOR_DELETE)
 279     {
 280       DPRINT("delete really key\n");
 281
 282       CmiRemoveSubKey(KeyObject->RegistryHive,
 283                       KeyObject->ParentKey,
 284                       KeyObject);
 285
 286       if (IsPermanentHive(KeyObject->RegistryHive))
 287         CmiSyncHives();
 288     }
 289   else
 290     {
 291       CmiReleaseBlock(KeyObject->RegistryHive, KeyObject->KeyCell);
 292     }
 293 }
 294
 295
 296 VOID
 297 CmiAddKeyToList(PKEY_OBJECT ParentKey,
 298                 PKEY_OBJECT NewKey)
 299 {
 300   KIRQL OldIrql;
 301
 302   DPRINT("ParentKey %.08x\n", ParentKey);
 303
 304   KeAcquireSpinLock(&CmiKeyListLock, &OldIrql);
 305
 306   if (ParentKey->SizeOfSubKeys <= ParentKey->NumberOfSubKeys)
 307     {
 308       PKEY_OBJECT *tmpSubKeys = ExAllocatePool(NonPagedPool,
 309         (ParentKey->NumberOfSubKeys + 1) * sizeof(DWORD));
 310
 311       if (ParentKey->NumberOfSubKeys > 0)
 312         {
 313           memcpy(tmpSubKeys,
 314                  ParentKey->SubKeys,
 315                  ParentKey->NumberOfSubKeys * sizeof(DWORD));
 316         }
 317
 318       if (ParentKey->SubKeys)
 319         ExFreePool(ParentKey->SubKeys);
 320
 321       ParentKey->SubKeys = tmpSubKeys;
 322       ParentKey->SizeOfSubKeys = ParentKey->NumberOfSubKeys + 1;
 323     }
 324
 325   /* FIXME: Please maintain the list in alphabetic order */
 326   /*      to allow a dichotomic search */
 327   ParentKey->SubKeys[ParentKey->NumberOfSubKeys++] = NewKey;
 328
 329   DPRINT("Reference parent key: 0x%x\n", ParentKey);
 330
 331   ObReferenceObjectByPointer(ParentKey,
 332                 STANDARD_RIGHTS_REQUIRED,
 333                 NULL,
 334                 UserMode);
 335   NewKey->ParentKey = ParentKey;
 336   KeReleaseSpinLock(&CmiKeyListLock, OldIrql);
 337 }
 338
 339
 340 NTSTATUS
 341 CmiRemoveKeyFromList(PKEY_OBJECT KeyToRemove)
 342 {
 343   PKEY_OBJECT ParentKey;
 344   KIRQL OldIrql;
 345   DWORD Index;
 346
 347   ParentKey = KeyToRemove->ParentKey;
 348   KeAcquireSpinLock(&CmiKeyListLock, &OldIrql);
 349   /* FIXME: If list maintained in alphabetic order, use dichotomic search */
 350   for (Index = 0; Index < ParentKey->NumberOfSubKeys; Index++)
 351     {
 352       if (ParentKey->SubKeys[Index] == KeyToRemove)
 353         {
 354           if (Index < ParentKey->NumberOfSubKeys-1)
 355             RtlMoveMemory(&ParentKey->SubKeys[Index],
 356                           &ParentKey->SubKeys[Index + 1],
 357                           (ParentKey->NumberOfSubKeys - Index - 1) * sizeof(PKEY_OBJECT));
 358           ParentKey->NumberOfSubKeys--;
 359           KeReleaseSpinLock(&CmiKeyListLock, OldIrql);
 360
 361           DPRINT("Dereference parent key: 0x%x\n", ParentKey);
 362
 363           ObDereferenceObject(ParentKey);
 364           return STATUS_SUCCESS;
 365         }
 366     }
 367   KeReleaseSpinLock(&CmiKeyListLock, OldIrql);
 368
 369   return STATUS_UNSUCCESSFUL;
 370 }
 371
 372
 373 PKEY_OBJECT
 374 CmiScanKeyList(PKEY_OBJECT Parent,
 375                PCHAR KeyName,
 376                ULONG Attributes)
 377 {
 378   PKEY_OBJECT CurKey;
 379   KIRQL OldIrql;
 380   WORD NameSize;
 381   DWORD Index;
 382
 383 #ifndef WIN32_REGDBG
 384   DPRINT("Scanning key list for: %s (Parent: %s)\n",
 385     KeyName, Parent->Name);
 386 #else
 387   {
 388       char buffer[_BUFFER_LEN];
 389       memset(buffer, 0, _BUFFER_LEN);
 390       strncpy(buffer, Parent->Name, min(Parent->NameSize, _BUFFER_LEN - 1));
 391       DPRINT("Scanning key list for: %s (Parent: %s)\n", KeyName, buffer);
 392   }
 393 #endif
 394
 395   NameSize = strlen(KeyName);
 396   KeAcquireSpinLock(&CmiKeyListLock, &OldIrql);
 397   /* FIXME: if list maintained in alphabetic order, use dichotomic search */
 398   for (Index=0; Index < Parent->NumberOfSubKeys; Index++)
 399     {
 400       CurKey = Parent->SubKeys[Index];
 401       if (Attributes & OBJ_CASE_INSENSITIVE)
 402         {
 403           if ((NameSize == CurKey->NameSize)
 404               && (_strnicmp(KeyName, CurKey->Name, NameSize) == 0))
 405             {
 406               KeReleaseSpinLock(&CmiKeyListLock, OldIrql);
 407               return CurKey;
 408             }
 409         }
 410       else
 411         {
 412           if ((NameSize == CurKey->NameSize)
 413               && (strncmp(KeyName,CurKey->Name,NameSize) == 0))
 414             {
 415               KeReleaseSpinLock(&CmiKeyListLock, OldIrql);
 416               return CurKey;
 417             }
 418         }
 419     }
 420   KeReleaseSpinLock(&CmiKeyListLock, OldIrql);
 421
 422   return NULL;
 423 }
 424
 425
 426 static NTSTATUS
 427 CmiGetLinkTarget(PREGISTRY_HIVE RegistryHive,
 428                  PKEY_CELL KeyCell,
 429                  PUNICODE_STRING TargetPath)
 430 {
 431   UNICODE_STRING LinkName = UNICODE_STRING_INITIALIZER(L"SymbolicLinkValue");
 432   PVALUE_CELL ValueCell;
 433   PDATA_CELL DataCell;
 434   NTSTATUS Status;
 435
 436   DPRINT("CmiGetLinkTarget() called\n");
 437
 438   /* Get Value block of interest */
 439   Status = CmiScanKeyForValue(RegistryHive,
 440                               KeyCell,
 441                               &LinkName,
 442                               &ValueCell,
 443                               NULL);
 444   if (!NT_SUCCESS(Status))
 445     {
 446       DPRINT1("CmiScanKeyForValue() failed (Status %lx)\n", Status);
 447       return(Status);
 448     }
 449
 450   if (ValueCell->DataType != REG_LINK)
 451     {
 452       DPRINT1("Type != REG_LINK\n!");
 453       return(STATUS_UNSUCCESSFUL);
 454     }
 455
 456   if (TargetPath->Buffer == NULL && TargetPath->MaximumLength == 0)
 457     {
 458       TargetPath->Length = 0;
 459       TargetPath->MaximumLength = ValueCell->DataSize + sizeof(WCHAR);
 460       TargetPath->Buffer = ExAllocatePool(NonPagedPool,
 461                                           TargetPath->MaximumLength);
 462     }
 463
 464   TargetPath->Length = min(TargetPath->MaximumLength - sizeof(WCHAR),
 465                            (ULONG) ValueCell->DataSize);
 466
 467   if (ValueCell->DataSize > 0)
 468     {
 469       DataCell = CmiGetBlock(RegistryHive, ValueCell->DataOffset, NULL);
 470       RtlCopyMemory(TargetPath->Buffer,
 471                     DataCell->Data,
 472                     TargetPath->Length);
 473       TargetPath->Buffer[TargetPath->Length / sizeof(WCHAR)] = 0;
 474       CmiReleaseBlock(RegistryHive, DataCell);
 475     }
 476   else
 477     {
 478       RtlCopyMemory(TargetPath->Buffer,
 479                     &ValueCell->DataOffset,
 480                     TargetPath->Length);
 481       TargetPath->Buffer[TargetPath->Length / sizeof(WCHAR)] = 0;
 482     }
 483
 484   DPRINT("TargetPath '%wZ'\n", TargetPath);
 485
 486   return(STATUS_SUCCESS);
 487 }
 488
 489 /* EOF */