source4/lib/registry/patchfile.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Reading registry patch files
   4
   5    Copyright (C) Jelmer Vernooij 2004-2007
   6    Copyright (C) Wilco Baan Hofman 2006
   7    Copyright (C) Matthias Dieter Wallnöfer 2008
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "lib/registry/registry.h"
  25 #include "system/filesys.h"
  26 #include "param/param.h"
  27
  28
  29 _PUBLIC_ WERROR reg_preg_diff_load(int fd,
  30                                    struct smb_iconv_convenience *iconv_convenience,
  31                                    const struct reg_diff_callbacks *callbacks,
  32                                    void *callback_data);
  33
  34 _PUBLIC_ WERROR reg_dotreg_diff_load(int fd,
  35                                      struct smb_iconv_convenience *iconv_convenience,
  36                                      const struct reg_diff_callbacks *callbacks,
  37                                      void *callback_data);
  38
  39 /*
  40  * Generate difference between two keys
  41  */
  42 WERROR reg_generate_diff_key(struct registry_key *oldkey,
  43                              struct registry_key *newkey,
  44                              const char *path,
  45                              const struct reg_diff_callbacks *callbacks,
  46                              void *callback_data)
  47 {
  48         int i;
  49         struct registry_key *t1 = NULL, *t2 = NULL;
  50         char *tmppath;
  51         const char *keyname1;
  52         WERROR error, error1, error2;
  53         TALLOC_CTX *mem_ctx = talloc_init("writediff");
  54         uint32_t old_num_subkeys, old_num_values,
  55                          new_num_subkeys, new_num_values;
  56
  57         if (oldkey != NULL) {
  58                 error = reg_key_get_info(mem_ctx, oldkey, NULL,
  59                                          &old_num_subkeys, &old_num_values,
  60                                          NULL, NULL, NULL, NULL);
  61                 if (!W_ERROR_IS_OK(error)) {
  62                         DEBUG(0, ("Error occurred while getting key info: %s\n",
  63                                 win_errstr(error)));
  64                         talloc_free(mem_ctx);
  65                         return error;
  66                 }
  67         } else {
  68                 old_num_subkeys = 0;
  69                 old_num_values = 0;
  70         }
  71
  72         /* Subkeys that were changed or deleted */
  73         for (i = 0; i < old_num_subkeys; i++) {
  74                 error1 = reg_key_get_subkey_by_index(mem_ctx, oldkey, i,
  75                                                      &keyname1, NULL, NULL);
  76                 if (!W_ERROR_IS_OK(error1)) {
  77                         DEBUG(0, ("Error occurred while getting subkey by index: %s\n",
  78                                 win_errstr(error1)));
  79                         continue;
  80                 }
  81
  82                 if (newkey != NULL) {
  83                         error2 = reg_open_key(mem_ctx, newkey, keyname1, &t2);
  84                 } else {
  85                         error2 = WERR_BADFILE;
  86                         t2 = NULL;
  87                 }
  88
  89                 if (!W_ERROR_IS_OK(error2) && !W_ERROR_EQUAL(error2, WERR_BADFILE)) {
  90                         DEBUG(0, ("Error occured while getting subkey by name: %s\n",
  91                                 win_errstr(error2)));
  92                         talloc_free(mem_ctx);
  93                         return error2;
  94                 }
  95
  96                 /* if "error2" is going to be "WERR_BADFILE", then newkey */
  97                 /* didn't have such a subkey and therefore add a del diff */
  98                 tmppath = talloc_asprintf(mem_ctx, "%s\\%s", path, keyname1);
  99                 if (!W_ERROR_IS_OK(error2))
 100                         callbacks->del_key(callback_data, tmppath);
 101
 102                 /* perform here also the recursive invocation */
 103                 error1 = reg_open_key(mem_ctx, oldkey, keyname1, &t1);
 104                 if (!W_ERROR_IS_OK(error1)) {
 105                         DEBUG(0, ("Error occured while getting subkey by name: %s\n",
 106                         win_errstr(error1)));
 107                         talloc_free(mem_ctx);
 108                         return error1;
 109                 }
 110                 reg_generate_diff_key(t1, t2, tmppath, callbacks, callback_data);
 111
 112                 talloc_free(tmppath);
 113         }
 114
 115         if (newkey != NULL) {
 116                 error = reg_key_get_info(mem_ctx, newkey, NULL,
 117                                          &new_num_subkeys, &new_num_values,
 118                                          NULL, NULL, NULL, NULL);
 119                 if (!W_ERROR_IS_OK(error)) {
 120                         DEBUG(0, ("Error occurred while getting key info: %s\n",
 121                                 win_errstr(error)));
 122                         talloc_free(mem_ctx);
 123                         return error;
 124                 }
 125         } else {
 126                 new_num_subkeys = 0;
 127                 new_num_values = 0;
 128         }
 129
 130         /* Subkeys that were added */
 131         for(i = 0; i < new_num_subkeys; i++) {
 132                 error1 = reg_key_get_subkey_by_index(mem_ctx, newkey, i,
 133                                                      &keyname1, NULL, NULL);
 134                 if (!W_ERROR_IS_OK(error1)) {
 135                         DEBUG(0, ("Error occurred while getting subkey by index: %s\n",
 136                                 win_errstr(error1)));
 137                         talloc_free(mem_ctx);
 138                         return error1;
 139                 }
 140
 141                 if (oldkey != NULL) {
 142                         error2 = reg_open_key(mem_ctx, oldkey, keyname1, &t1);
 143
 144                         if (W_ERROR_IS_OK(error2))
 145                                 continue;
 146                 } else {
 147                         error2 = WERR_BADFILE;
 148                         t1 = NULL;
 149                 }
 150
 151                 if (!W_ERROR_EQUAL(error2, WERR_BADFILE)) {
 152                         DEBUG(0, ("Error occurred while getting subkey by name: %s\n",
 153                                 win_errstr(error2)));
 154                         talloc_free(mem_ctx);
 155                         return error2;
 156                 }
 157
 158                 /* oldkey didn't have such a subkey, add add diff */
 159                 tmppath = talloc_asprintf(mem_ctx, "%s\\%s", path, keyname1);
 160                 callbacks->add_key(callback_data, tmppath);
 161
 162                 /* perform here also the recursive invocation */
 163                 error1 = reg_open_key(mem_ctx, newkey, keyname1, &t2);
 164                 if (!W_ERROR_IS_OK(error1)) {
 165                         DEBUG(0, ("Error occured while getting subkey by name: %s\n",
 166                         win_errstr(error1)));
 167                         talloc_free(mem_ctx);
 168                         return error1;
 169                 }
 170                 reg_generate_diff_key(t1, t2, tmppath, callbacks, callback_data);
 171
 172                 talloc_free(tmppath);
 173         }
 174
 175         /* Values that were added or changed */
 176         for(i = 0; i < new_num_values; i++) {
 177                 const char *name;
 178                 uint32_t type1, type2;
 179                 DATA_BLOB contents1, contents2;
 180
 181                 error1 = reg_key_get_value_by_index(mem_ctx, newkey, i,
 182                                                     &name, &type1, &contents1);
 183                 if (!W_ERROR_IS_OK(error1)) {
 184                         DEBUG(0, ("Unable to get value by index: %s\n",
 185                                 win_errstr(error1)));
 186                         talloc_free(mem_ctx);
 187                         return error1;
 188                 }
 189
 190                 if (oldkey != NULL) {
 191                         error2 = reg_key_get_value_by_name(mem_ctx, oldkey,
 192                                                            name, &type2,
 193                                                            &contents2);
 194                 } else
 195                         error2 = WERR_BADFILE;
 196
 197                 if (!W_ERROR_IS_OK(error2)
 198                         && !W_ERROR_EQUAL(error2, WERR_BADFILE)) {
 199                         DEBUG(0, ("Error occurred while getting value by name: %s\n",
 200                                 win_errstr(error2)));
 201                         talloc_free(mem_ctx);
 202                         return error2;
 203                 }
 204
 205                 if (W_ERROR_IS_OK(error2)
 206                         && (data_blob_cmp(&contents1, &contents2) == 0)
 207                         && (type1 == type2))
 208                         continue;
 209
 210                 callbacks->set_value(callback_data, path, name,
 211                                      type1, contents1);
 212         }
 213
 214         /* Values that were deleted */
 215         for (i = 0; i < old_num_values; i++) {
 216                 const char *name;
 217                 uint32_t type;
 218                 DATA_BLOB contents;
 219
 220                 error1 = reg_key_get_value_by_index(mem_ctx, oldkey, i, &name,
 221                                                     &type, &contents);
 222                 if (!W_ERROR_IS_OK(error1)) {
 223                         DEBUG(0, ("Unable to get value by index: %s\n",
 224                                 win_errstr(error1)));
 225                         talloc_free(mem_ctx);
 226                         return error1;
 227                 }
 228
 229                 if (newkey != NULL)
 230                         error2 = reg_key_get_value_by_name(mem_ctx, newkey,
 231                                  name, &type, &contents);
 232                 else
 233                         error2 = WERR_BADFILE;
 234
 235                 if (W_ERROR_IS_OK(error2))
 236                         continue;
 237
 238                 if (!W_ERROR_EQUAL(error2, WERR_BADFILE)) {
 239                         DEBUG(0, ("Error occurred while getting value by name: %s\n",
 240                                 win_errstr(error2)));
 241                         talloc_free(mem_ctx);
 242                         return error2;
 243                 }
 244
 245                 callbacks->del_value(callback_data, path, name);
 246         }
 247
 248         talloc_free(mem_ctx);
 249         return WERR_OK;
 250 }
 251
 252 /**
 253  * Generate diff between two registry contexts
 254  */
 255 _PUBLIC_ WERROR reg_generate_diff(struct registry_context *ctx1,
 256                                   struct registry_context *ctx2,
 257                                   const struct reg_diff_callbacks *callbacks,
 258                                   void *callback_data)
 259 {
 260         int i;
 261         WERROR error;
 262
 263         for (i = 0; reg_predefined_keys[i].name; i++) {
 264                 struct registry_key *r1 = NULL, *r2 = NULL;
 265
 266                 error = reg_get_predefined_key(ctx1,
 267                         reg_predefined_keys[i].handle, &r1);
 268                 if (!W_ERROR_IS_OK(error) &&
 269                     !W_ERROR_EQUAL(error, WERR_BADFILE)) {
 270                         DEBUG(0, ("Unable to open hive %s for backend 1\n",
 271                                 reg_predefined_keys[i].name));
 272                         continue;
 273                 }
 274
 275                 error = reg_get_predefined_key(ctx2,
 276                         reg_predefined_keys[i].handle, &r2);
 277                 if (!W_ERROR_IS_OK(error) &&
 278                     !W_ERROR_EQUAL(error, WERR_BADFILE)) {
 279                         DEBUG(0, ("Unable to open hive %s for backend 2\n",
 280                                 reg_predefined_keys[i].name));
 281                         continue;
 282                 }
 283
 284                 error = reg_generate_diff_key(r1, r2,
 285                         reg_predefined_keys[i].name, callbacks,
 286                         callback_data);
 287                 if (!W_ERROR_IS_OK(error)) {
 288                         DEBUG(0, ("Unable to determine diff: %s\n",
 289                                 win_errstr(error)));
 290                         return error;
 291                 }
 292         }
 293         if (callbacks->done != NULL) {
 294                 callbacks->done(callback_data);
 295         }
 296         return WERR_OK;
 297 }
 298
 299 /**
 300  * Load diff file
 301  */
 302 _PUBLIC_ WERROR reg_diff_load(const char *filename,
 303                               struct smb_iconv_convenience *iconv_convenience,
 304                               const struct reg_diff_callbacks *callbacks,
 305                               void *callback_data)
 306 {
 307         int fd;
 308         char hdr[4];
 309
 310         fd = open(filename, O_RDONLY, 0);
 311         if (fd == -1) {
 312                 DEBUG(0, ("Error opening registry patch file `%s'\n",
 313                         filename));
 314                 return WERR_GENERAL_FAILURE;
 315         }
 316
 317         if (read(fd, &hdr, 4) != 4) {
 318                 DEBUG(0, ("Error reading registry patch file `%s'\n",
 319                         filename));
 320                 return WERR_GENERAL_FAILURE;
 321         }
 322
 323         /* Reset position in file */
 324         lseek(fd, 0, SEEK_SET);
 325 #if 0 /* These backends are not supported yet. */
 326         if (strncmp(hdr, "CREG", 4) == 0) {
 327                 /* Must be a W9x CREG Config.pol file */
 328                 return reg_creg_diff_load(diff, fd);
 329         } else if (strncmp(hdr, "regf", 4) == 0) {
 330                 /* Must be a REGF NTConfig.pol file */
 331                 return reg_regf_diff_load(diff, fd);
 332         } else
 333 #endif
 334         if (strncmp(hdr, "PReg", 4) == 0) {
 335                 /* Must be a GPO Registry.pol file */
 336                 return reg_preg_diff_load(fd, iconv_convenience, callbacks, callback_data);
 337         } else {
 338                 /* Must be a normal .REG file */
 339                 return reg_dotreg_diff_load(fd, iconv_convenience, callbacks, callback_data);
 340         }
 341 }
 342
 343 /**
 344  * The reg_diff_apply functions
 345  */
 346 static WERROR reg_diff_apply_add_key(void *_ctx, const char *key_name)
 347 {
 348         struct registry_context *ctx = (struct registry_context *)_ctx;
 349         struct registry_key *tmp;
 350         char *buf, *buf_ptr;
 351         WERROR error;
 352
 353         /* Recursively create the path */
 354         buf = talloc_strdup(ctx, key_name);
 355         buf_ptr = buf;
 356
 357         while (*buf_ptr++ != '\0' ) {
 358                 if (*buf_ptr == '\\') {
 359                         *buf_ptr = '\0';
 360                         error = reg_key_add_abs(ctx, ctx, buf, 0, NULL, &tmp);
 361
 362                         if (!W_ERROR_EQUAL(error, WERR_ALREADY_EXISTS) &&
 363                                     !W_ERROR_IS_OK(error)) {
 364                                 DEBUG(0, ("Error adding new key '%s': %s\n",
 365                                         key_name, win_errstr(error)));
 366                                 return error;
 367                         }
 368                         *buf_ptr++ = '\\';
 369                 }
 370         }
 371
 372         /* Add the key */
 373         error = reg_key_add_abs(ctx, ctx, key_name, 0, NULL, &tmp);
 374
 375         if (!W_ERROR_EQUAL(error, WERR_ALREADY_EXISTS) &&
 376                     !W_ERROR_IS_OK(error)) {
 377                 DEBUG(0, ("Error adding new key '%s': %s\n",
 378                         key_name, win_errstr(error)));
 379                 return error;
 380         }
 381         return WERR_OK;
 382 }
 383
 384 static WERROR reg_diff_apply_del_key(void *_ctx, const char *key_name)
 385 {
 386         struct registry_context *ctx = (struct registry_context *)_ctx;
 387
 388         /* We can't proof here for success, because a common superkey could */
 389         /* have been deleted before the subkey's (diff order). This removed */
 390         /* therefore all childs recursively and the "WERR_BADFILE" result is */
 391         /* expected. */
 392
 393         reg_key_del_abs(ctx, key_name);
 394
 395         return WERR_OK;
 396 }
 397
 398 static WERROR reg_diff_apply_set_value(void *_ctx, const char *path,
 399                                        const char *value_name,
 400                                        uint32_t value_type, DATA_BLOB value)
 401 {
 402         struct registry_context *ctx = (struct registry_context *)_ctx;
 403         struct registry_key *tmp;
 404         WERROR error;
 405
 406         /* Open key */
 407         error = reg_open_key_abs(ctx, ctx, path, &tmp);
 408
 409         if (W_ERROR_EQUAL(error, WERR_BADFILE)) {
 410                 DEBUG(0, ("Error opening key '%s'\n", path));
 411                 return error;
 412         }
 413
 414         /* Set value */
 415         error = reg_val_set(tmp, value_name,
 416                                  value_type, value);
 417         if (!W_ERROR_IS_OK(error)) {
 418                 DEBUG(0, ("Error setting value '%s'\n", value_name));
 419                 return error;
 420         }
 421
 422         return WERR_OK;
 423 }
 424
 425 static WERROR reg_diff_apply_del_value(void *_ctx, const char *key_name,
 426                                        const char *value_name)
 427 {
 428         struct registry_context *ctx = (struct registry_context *)_ctx;
 429         struct registry_key *tmp;
 430         WERROR error;
 431
 432         /* Open key */
 433         error = reg_open_key_abs(ctx, ctx, key_name, &tmp);
 434
 435         if (!W_ERROR_IS_OK(error)) {
 436                 DEBUG(0, ("Error opening key '%s'\n", key_name));
 437                 return error;
 438         }
 439
 440         error = reg_del_value(tmp, value_name);
 441         if (!W_ERROR_IS_OK(error)) {
 442                 DEBUG(0, ("Error deleting value '%s'\n", value_name));
 443                 return error;
 444         }
 445
 446
 447         return WERR_OK;
 448 }
 449
 450 static WERROR reg_diff_apply_del_all_values(void *_ctx, const char *key_name)
 451 {
 452         struct registry_context *ctx = (struct registry_context *)_ctx;
 453         struct registry_key *key;
 454         WERROR error;
 455         const char* value_name;
 456
 457         error = reg_open_key_abs(ctx, ctx, key_name, &key);
 458
 459         if (!W_ERROR_IS_OK(error)) {
 460                 DEBUG(0, ("Error opening key '%s'\n", key_name));
 461                 return error;
 462         }
 463
 464         W_ERROR_NOT_OK_RETURN(reg_key_get_info(ctx, key, NULL,
 465                                NULL, NULL, NULL, NULL, NULL, NULL));
 466
 467         while (W_ERROR_IS_OK(reg_key_get_value_by_index(
 468                         ctx, key, 0, &value_name, NULL, NULL))) {
 469                 error = reg_del_value(key, value_name);
 470                 if (!W_ERROR_IS_OK(error)) {
 471                         DEBUG(0, ("Error deleting value '%s'\n", value_name));
 472                         return error;
 473                 }
 474         }
 475
 476         return WERR_OK;
 477 }
 478
 479 /**
 480  * Apply diff to a registry context
 481  */
 482 _PUBLIC_ WERROR reg_diff_apply(struct registry_context *ctx,
 483                                                            struct smb_iconv_convenience *iconv_convenience,
 484                                                            const char *filename)
 485 {
 486         struct reg_diff_callbacks callbacks;
 487
 488         callbacks.add_key = reg_diff_apply_add_key;
 489         callbacks.del_key = reg_diff_apply_del_key;
 490         callbacks.set_value = reg_diff_apply_set_value;
 491         callbacks.del_value = reg_diff_apply_del_value;
 492         callbacks.del_all_values = reg_diff_apply_del_all_values;
 493         callbacks.done = NULL;
 494
 495         return reg_diff_load(filename, iconv_convenience,
 496                              &callbacks, ctx);
 497 }