source3/registry/reg_objects.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  Virtual Windows Registry Layer
   4  *  Copyright (C) Gerald Carter                     2002-2005
   5  *  Copyright (C) Michael Adam                      2007-2010
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 3 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 /* Implementation of registry frontend view functions. */
  22
  23 #include "includes.h"
  24 #include "registry.h"
  25 #include "reg_objects.h"
  26 #include "util_tdb.h"
  27 #include "dbwrap.h"
  28 #include "../libcli/registry/util_reg.h"
  29
  30 #undef DBGC_CLASS
  31 #define DBGC_CLASS DBGC_REGISTRY
  32
  33 /* low level structure to contain registry values */
  34
  35 struct regval_blob {
  36         fstring         valuename;
  37         uint32_t        type;
  38         /* this should be encapsulated in an RPC_DATA_BLOB */
  39         uint32_t        size;   /* in bytes */
  40         uint8_t         *data_p;
  41 };
  42
  43 /* container for registry values */
  44
  45 struct regval_ctr {
  46         uint32_t num_values;
  47         struct regval_blob **values;
  48         int seqnum;
  49 };
  50
  51 struct regsubkey_ctr {
  52         uint32_t        num_subkeys;
  53         char            **subkeys;
  54         struct db_context *subkeys_hash;
  55         int seqnum;
  56 };
  57
  58 /**********************************************************************
  59
  60  Note that the struct regsubkey_ctr and struct regval_ctr objects *must* be
  61  talloc()'d since the methods use the object pointer as the talloc
  62  context for internal private data.
  63
  64  There is no longer a regval_ctr_intit() and regval_ctr_destroy()
  65  pair of functions.  Simply talloc_zero() and TALLOC_FREE() the
  66  object.
  67
  68  **********************************************************************/
  69
  70 WERROR regsubkey_ctr_init(TALLOC_CTX *mem_ctx, struct regsubkey_ctr **ctr)
  71 {
  72         if (ctr == NULL) {
  73                 return WERR_INVALID_PARAM;
  74         }
  75
  76         *ctr = talloc_zero(mem_ctx, struct regsubkey_ctr);
  77         if (*ctr == NULL) {
  78                 return WERR_NOMEM;
  79         }
  80
  81         (*ctr)->subkeys_hash = db_open_rbt(*ctr);
  82         if ((*ctr)->subkeys_hash == NULL) {
  83                 talloc_free(*ctr);
  84                 return WERR_NOMEM;
  85         }
  86
  87         return WERR_OK;
  88 }
  89
  90 /**
  91  * re-initialize the list of subkeys (to the emtpy list)
  92  * in an already allocated regsubkey_ctr
  93  */
  94
  95 WERROR regsubkey_ctr_reinit(struct regsubkey_ctr *ctr)
  96 {
  97         if (ctr == NULL) {
  98                 return WERR_INVALID_PARAM;
  99         }
 100
 101         talloc_free(ctr->subkeys_hash);
 102         ctr->subkeys_hash = db_open_rbt(ctr);
 103         W_ERROR_HAVE_NO_MEMORY(ctr->subkeys_hash);
 104
 105         TALLOC_FREE(ctr->subkeys);
 106
 107         ctr->num_subkeys = 0;
 108         ctr->seqnum = 0;
 109
 110         return WERR_OK;
 111 }
 112
 113 WERROR regsubkey_ctr_set_seqnum(struct regsubkey_ctr *ctr, int seqnum)
 114 {
 115         if (ctr == NULL) {
 116                 return WERR_INVALID_PARAM;
 117         }
 118
 119         ctr->seqnum = seqnum;
 120
 121         return WERR_OK;
 122 }
 123
 124 int regsubkey_ctr_get_seqnum(struct regsubkey_ctr *ctr)
 125 {
 126         if (ctr == NULL) {
 127                 return -1;
 128         }
 129
 130         return ctr->seqnum;
 131 }
 132
 133 static WERROR regsubkey_ctr_hash_keyname(struct regsubkey_ctr *ctr,
 134                                          const char *keyname,
 135                                          uint32_t idx)
 136 {
 137         WERROR werr;
 138
 139         werr = ntstatus_to_werror(dbwrap_store_bystring_upper(ctr->subkeys_hash,
 140                                                 keyname,
 141                                                 make_tdb_data((uint8_t *)&idx,
 142                                                               sizeof(idx)),
 143                                                 TDB_REPLACE));
 144         if (!W_ERROR_IS_OK(werr)) {
 145                 DEBUG(1, ("error hashing new key '%s' in container: %s\n",
 146                           keyname, win_errstr(werr)));
 147         }
 148
 149         return werr;
 150 }
 151
 152 static WERROR regsubkey_ctr_unhash_keyname(struct regsubkey_ctr *ctr,
 153                                            const char *keyname)
 154 {
 155         WERROR werr;
 156
 157         werr = ntstatus_to_werror(dbwrap_delete_bystring_upper(ctr->subkeys_hash,
 158                                   keyname));
 159         if (!W_ERROR_IS_OK(werr)) {
 160                 DEBUG(1, ("error unhashing key '%s' in container: %s\n",
 161                           keyname, win_errstr(werr)));
 162         }
 163
 164         return werr;
 165 }
 166
 167 static WERROR regsubkey_ctr_index_for_keyname(struct regsubkey_ctr *ctr,
 168                                               const char *keyname,
 169                                               uint32_t *idx)
 170 {
 171         TDB_DATA data;
 172
 173         if ((ctr == NULL) || (keyname == NULL)) {
 174                 return WERR_INVALID_PARAM;
 175         }
 176
 177         data = dbwrap_fetch_bystring_upper(ctr->subkeys_hash, ctr, keyname);
 178         if (data.dptr == NULL) {
 179                 return WERR_NOT_FOUND;
 180         }
 181
 182         if (data.dsize != sizeof(*idx)) {
 183                 talloc_free(data.dptr);
 184                 return WERR_INVALID_DATATYPE;
 185         }
 186
 187         if (idx != NULL) {
 188                 *idx = *(uint32_t *)data.dptr;
 189         }
 190
 191         talloc_free(data.dptr);
 192         return WERR_OK;
 193 }
 194
 195 /***********************************************************************
 196  Add a new key to the array
 197  **********************************************************************/
 198
 199 WERROR regsubkey_ctr_addkey( struct regsubkey_ctr *ctr, const char *keyname )
 200 {
 201         char **newkeys;
 202         WERROR werr;
 203
 204         if ( !keyname ) {
 205                 return WERR_OK;
 206         }
 207
 208         /* make sure the keyname is not already there */
 209
 210         if ( regsubkey_ctr_key_exists( ctr, keyname ) ) {
 211                 return WERR_OK;
 212         }
 213
 214         if (!(newkeys = talloc_realloc(ctr, ctr->subkeys, char *,
 215                                              ctr->num_subkeys+1))) {
 216                 return WERR_NOMEM;
 217         }
 218
 219         ctr->subkeys = newkeys;
 220
 221         if (!(ctr->subkeys[ctr->num_subkeys] = talloc_strdup(ctr->subkeys,
 222                                                              keyname ))) {
 223                 /*
 224                  * Don't shrink the new array again, this wastes a pointer
 225                  */
 226                 return WERR_NOMEM;
 227         }
 228
 229         werr = regsubkey_ctr_hash_keyname(ctr, keyname, ctr->num_subkeys);
 230         W_ERROR_NOT_OK_RETURN(werr);
 231
 232         ctr->num_subkeys++;
 233
 234         return WERR_OK;
 235 }
 236
 237  /***********************************************************************
 238  Delete a key from the array
 239  **********************************************************************/
 240
 241 WERROR regsubkey_ctr_delkey( struct regsubkey_ctr *ctr, const char *keyname )
 242 {
 243         WERROR werr;
 244         uint32_t idx, j;
 245
 246         if (keyname == NULL) {
 247                 return WERR_INVALID_PARAM;
 248         }
 249
 250         /* make sure the keyname is actually already there */
 251
 252         werr = regsubkey_ctr_index_for_keyname(ctr, keyname, &idx);
 253         W_ERROR_NOT_OK_RETURN(werr);
 254
 255         werr = regsubkey_ctr_unhash_keyname(ctr, keyname);
 256         W_ERROR_NOT_OK_RETURN(werr);
 257
 258         /* update if we have any keys left */
 259         ctr->num_subkeys--;
 260         if (idx < ctr->num_subkeys) {
 261                 memmove(&ctr->subkeys[idx], &ctr->subkeys[idx+1],
 262                         sizeof(char *) * (ctr->num_subkeys - idx));
 263
 264                 /* we have to re-hash rest of the array...  :-( */
 265                 for (j = idx; j < ctr->num_subkeys; j++) {
 266                         werr = regsubkey_ctr_hash_keyname(ctr, ctr->subkeys[j], j);
 267                         W_ERROR_NOT_OK_RETURN(werr);
 268                 }
 269         }
 270
 271         return WERR_OK;
 272 }
 273
 274 /***********************************************************************
 275  Check for the existance of a key
 276  **********************************************************************/
 277
 278 bool regsubkey_ctr_key_exists( struct regsubkey_ctr *ctr, const char *keyname )
 279 {
 280         WERROR werr;
 281
 282         if (!ctr->subkeys) {
 283                 return False;
 284         }
 285
 286         werr = regsubkey_ctr_index_for_keyname(ctr, keyname, NULL);
 287         if (!W_ERROR_IS_OK(werr)) {
 288                 return false;
 289         }
 290
 291         return true;
 292 }
 293
 294 /***********************************************************************
 295  How many keys does the container hold ?
 296  **********************************************************************/
 297
 298 int regsubkey_ctr_numkeys( struct regsubkey_ctr *ctr )
 299 {
 300         return ctr->num_subkeys;
 301 }
 302
 303 /***********************************************************************
 304  Retreive a specific key string
 305  **********************************************************************/
 306
 307 char* regsubkey_ctr_specific_key( struct regsubkey_ctr *ctr, uint32_t key_index )
 308 {
 309         if ( ! (key_index < ctr->num_subkeys) )
 310                 return NULL;
 311
 312         return ctr->subkeys[key_index];
 313 }
 314
 315 /*
 316  * Utility functions for struct regval_ctr
 317  */
 318
 319 /**
 320  * allocate a regval_ctr structure.
 321  */
 322 WERROR regval_ctr_init(TALLOC_CTX *mem_ctx, struct regval_ctr **ctr)
 323 {
 324         if (ctr == NULL) {
 325                 return WERR_INVALID_PARAM;
 326         }
 327
 328         *ctr = talloc_zero(mem_ctx, struct regval_ctr);
 329         if (*ctr == NULL) {
 330                 return WERR_NOMEM;
 331         }
 332
 333         return WERR_OK;
 334 }
 335
 336 /***********************************************************************
 337  How many keys does the container hold ?
 338  **********************************************************************/
 339
 340 int regval_ctr_numvals(struct regval_ctr *ctr)
 341 {
 342         return ctr->num_values;
 343 }
 344
 345 /***********************************************************************
 346  allocate memory for and duplicate a struct regval_blob.
 347  This is malloc'd memory so the caller should free it when done
 348  **********************************************************************/
 349
 350 struct regval_blob* dup_registry_value(struct regval_blob *val)
 351 {
 352         struct regval_blob *copy = NULL;
 353
 354         if ( !val )
 355                 return NULL;
 356
 357         if ( !(copy = SMB_MALLOC_P( struct regval_blob)) ) {
 358                 DEBUG(0,("dup_registry_value: malloc() failed!\n"));
 359                 return NULL;
 360         }
 361
 362         /* copy all the non-pointer initial data */
 363
 364         memcpy( copy, val, sizeof(struct regval_blob) );
 365
 366         copy->size = 0;
 367         copy->data_p = NULL;
 368
 369         if ( val->data_p && val->size )
 370         {
 371                 if ( !(copy->data_p = (uint8_t *)memdup( val->data_p,
 372                                                        val->size )) ) {
 373                         DEBUG(0,("dup_registry_value: memdup() failed for [%d] "
 374                                  "bytes!\n", val->size));
 375                         SAFE_FREE( copy );
 376                         return NULL;
 377                 }
 378                 copy->size = val->size;
 379         }
 380
 381         return copy;
 382 }
 383
 384 /**********************************************************************
 385  free the memory allocated to a struct regval_blob
 386  *********************************************************************/
 387
 388 void free_registry_value(struct regval_blob *val)
 389 {
 390         if ( !val )
 391                 return;
 392
 393         SAFE_FREE( val->data_p );
 394         SAFE_FREE( val );
 395
 396         return;
 397 }
 398
 399 /**********************************************************************
 400  *********************************************************************/
 401
 402 uint8_t* regval_data_p(struct regval_blob *val)
 403 {
 404         return val->data_p;
 405 }
 406
 407 /**********************************************************************
 408  *********************************************************************/
 409
 410 uint32_t regval_size(struct regval_blob *val)
 411 {
 412         return val->size;
 413 }
 414
 415 /**********************************************************************
 416  *********************************************************************/
 417
 418 char* regval_name(struct regval_blob *val)
 419 {
 420         return val->valuename;
 421 }
 422
 423 /**********************************************************************
 424  *********************************************************************/
 425
 426 uint32_t regval_type(struct regval_blob *val)
 427 {
 428         return val->type;
 429 }
 430
 431 /***********************************************************************
 432  Retreive a pointer to a specific value.  Caller shoud dup the structure
 433  since this memory will go away when the ctr is free()'d
 434  **********************************************************************/
 435
 436 struct regval_blob *regval_ctr_specific_value(struct regval_ctr *ctr,
 437                                               uint32_t idx)
 438 {
 439         if ( !(idx < ctr->num_values) )
 440                 return NULL;
 441
 442         return ctr->values[idx];
 443 }
 444
 445 /***********************************************************************
 446  Check for the existance of a value
 447  **********************************************************************/
 448
 449 bool regval_ctr_key_exists(struct regval_ctr *ctr, const char *value)
 450 {
 451         int     i;
 452
 453         for ( i=0; i<ctr->num_values; i++ ) {
 454                 if ( strequal( ctr->values[i]->valuename, value) )
 455                         return True;
 456         }
 457
 458         return False;
 459 }
 460
 461 /***********************************************************************
 462  * compose a struct regval_blob from input data
 463  **********************************************************************/
 464
 465 struct regval_blob *regval_compose(TALLOC_CTX *ctx, const char *name,
 466                                    uint32_t type,
 467                                    const uint8_t *data_p, size_t size)
 468 {
 469         struct regval_blob *regval = talloc(ctx, struct regval_blob);
 470
 471         if (regval == NULL) {
 472                 return NULL;
 473         }
 474
 475         fstrcpy(regval->valuename, name);
 476         regval->type = type;
 477         if (size) {
 478                 regval->data_p = (uint8_t *)talloc_memdup(regval, data_p, size);
 479                 if (!regval->data_p) {
 480                         TALLOC_FREE(regval);
 481                         return NULL;
 482                 }
 483         } else {
 484                 regval->data_p = NULL;
 485         }
 486         regval->size = size;
 487
 488         return regval;
 489 }
 490
 491 /***********************************************************************
 492  Add a new registry value to the array
 493  **********************************************************************/
 494
 495 int regval_ctr_addvalue(struct regval_ctr *ctr, const char *name, uint32_t type,
 496                         const uint8_t *data_p, size_t size)
 497 {
 498         if ( !name )
 499                 return ctr->num_values;
 500
 501         /* Delete the current value (if it exists) and add the new one */
 502
 503         regval_ctr_delvalue( ctr, name );
 504
 505         /* allocate a slot in the array of pointers */
 506
 507         if (  ctr->num_values == 0 ) {
 508                 ctr->values = talloc( ctr, struct regval_blob *);
 509         } else {
 510                 ctr->values = talloc_realloc(ctr, ctr->values,
 511                                                    struct regval_blob *,
 512                                                    ctr->num_values+1);
 513         }
 514
 515         if (!ctr->values) {
 516                 ctr->num_values = 0;
 517                 return 0;
 518         }
 519
 520         /* allocate a new value and store the pointer in the arrya */
 521
 522         ctr->values[ctr->num_values] = regval_compose(ctr, name, type, data_p,
 523                                                       size);
 524         if (ctr->values[ctr->num_values] == NULL) {
 525                 ctr->num_values = 0;
 526                 return 0;
 527         }
 528         ctr->num_values++;
 529
 530         return ctr->num_values;
 531 }
 532
 533 /***********************************************************************
 534  Add a new registry SZ value to the array
 535  **********************************************************************/
 536
 537 int regval_ctr_addvalue_sz(struct regval_ctr *ctr, const char *name, const char *data)
 538 {
 539         DATA_BLOB blob;
 540
 541         if (!push_reg_sz(ctr, &blob, data)) {
 542                 return -1;
 543         }
 544
 545         return regval_ctr_addvalue(ctr, name, REG_SZ,
 546                                    (const uint8_t *)blob.data,
 547                                    blob.length);
 548 }
 549
 550 /***********************************************************************
 551  Add a new registry MULTI_SZ value to the array
 552  **********************************************************************/
 553
 554 int regval_ctr_addvalue_multi_sz(struct regval_ctr *ctr, const char *name, const char **data)
 555 {
 556         DATA_BLOB blob;
 557
 558         if (!push_reg_multi_sz(ctr, &blob, data)) {
 559                 return -1;
 560         }
 561
 562         return regval_ctr_addvalue(ctr, name, REG_MULTI_SZ,
 563                                    (const uint8_t *)blob.data,
 564                                    blob.length);
 565 }
 566
 567 /***********************************************************************
 568  Add a new registry value to the array
 569  **********************************************************************/
 570
 571 int regval_ctr_copyvalue(struct regval_ctr *ctr, struct regval_blob *val)
 572 {
 573         if ( val ) {
 574                 regval_ctr_addvalue(ctr, val->valuename, val->type,
 575                                     (uint8_t *)val->data_p, val->size);
 576         }
 577
 578         return ctr->num_values;
 579 }
 580
 581 /***********************************************************************
 582  Delete a single value from the registry container.
 583  No need to free memory since it is talloc'd.
 584  **********************************************************************/
 585
 586 int regval_ctr_delvalue(struct regval_ctr *ctr, const char *name)
 587 {
 588         int     i;
 589
 590         for ( i=0; i<ctr->num_values; i++ ) {
 591                 if ( strequal( ctr->values[i]->valuename, name ) )
 592                         break;
 593         }
 594
 595         /* just return if we don't find it */
 596
 597         if ( i == ctr->num_values )
 598                 return ctr->num_values;
 599
 600         /* If 'i' was not the last element, just shift everything down one */
 601         ctr->num_values--;
 602         if ( i < ctr->num_values )
 603                 memmove(&ctr->values[i], &ctr->values[i+1],
 604                         sizeof(struct regval_blob*)*(ctr->num_values-i));
 605
 606         return ctr->num_values;
 607 }
 608
 609 /***********************************************************************
 610  Retrieve single value from the registry container.
 611  No need to free memory since it is talloc'd.
 612  **********************************************************************/
 613
 614 struct regval_blob* regval_ctr_getvalue(struct regval_ctr *ctr,
 615                                         const char *name)
 616 {
 617         int     i;
 618
 619         /* search for the value */
 620
 621         for ( i=0; i<ctr->num_values; i++ ) {
 622                 if ( strequal( ctr->values[i]->valuename, name ) )
 623                         return ctr->values[i];
 624         }
 625
 626         return NULL;
 627 }
 628
 629 int regval_ctr_get_seqnum(struct regval_ctr *ctr)
 630 {
 631         if (ctr == NULL) {
 632                 return -1;
 633         }
 634
 635         return ctr->seqnum;
 636 }
 637
 638 WERROR regval_ctr_set_seqnum(struct regval_ctr *ctr, int seqnum)
 639 {
 640         if (ctr == NULL) {
 641                 return WERR_INVALID_PARAM;
 642         }
 643
 644         ctr->seqnum = seqnum;
 645
 646         return WERR_OK;
 647 }
 648
 649 /***********************************************************************
 650  return the data_p as a uint32_t
 651  **********************************************************************/
 652
 653 uint32_t regval_dword(struct regval_blob *val)
 654 {
 655         uint32_t data;
 656
 657         data = IVAL( regval_data_p(val), 0 );
 658
 659         return data;
 660 }
 661
 662 /***********************************************************************
 663  return the data_p as a character string
 664  **********************************************************************/
 665
 666 const char *regval_sz(struct regval_blob *val)
 667 {
 668         const char *data = NULL;
 669         DATA_BLOB blob = data_blob_const(regval_data_p(val), regval_size(val));
 670
 671         pull_reg_sz(talloc_tos(), &blob, &data);
 672
 673         return data;
 674 }