source4/lib/registry/local.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Transparent registry backend handling
   4    Copyright (C) Jelmer Vernooij                        2003-2007.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22 #include "../lib/util/dlinklist.h"
  23 #include "lib/registry/registry.h"
  24 #include "system/filesys.h"
  25
  26 struct reg_key_path {
  27         uint32_t predefined_key;
  28         const char **elements;
  29 };
  30
  31 struct registry_local {
  32         const struct registry_operations *ops;
  33
  34         struct mountpoint {
  35                 struct reg_key_path path;
  36                 struct hive_key *key;
  37                 struct mountpoint *prev, *next;
  38         } *mountpoints;
  39 };
  40
  41 struct local_key {
  42         struct registry_key global;
  43         struct reg_key_path path;
  44         struct hive_key *hive_key;
  45 };
  46
  47
  48 struct registry_key *reg_import_hive_key(struct registry_context *ctx,
  49                                          struct hive_key *hive,
  50                                          uint32_t predefined_key,
  51                                          const char **elements)
  52 {
  53         struct local_key *local_key;
  54         struct reg_key_path parent_path;
  55
  56         parent_path.predefined_key = predefined_key;
  57         parent_path.elements = elements;
  58
  59         local_key = talloc(ctx, struct local_key);
  60         if (local_key != NULL) {
  61                 local_key->hive_key = talloc_reference(local_key, hive);
  62                 local_key->global.context = talloc_reference(local_key, ctx);
  63                 local_key->path = parent_path;
  64         }
  65
  66         return (struct registry_key *)local_key;
  67 }
  68
  69
  70 static WERROR local_open_key(TALLOC_CTX *mem_ctx,
  71                              struct registry_key *parent,
  72                              const char *path,
  73                              struct registry_key **result)
  74 {
  75         char *orig, *curbegin, *curend;
  76         struct local_key *local_parent = talloc_get_type(parent,
  77                                                          struct local_key);
  78         struct hive_key *curkey = local_parent->hive_key;
  79         WERROR error;
  80         const char **elements = NULL;
  81         int el;
  82
  83         if (path == NULL || path[0] == '\0') {
  84                 return WERR_INVALID_PARAMETER;
  85         }
  86
  87         orig = talloc_strdup(mem_ctx, path);
  88         W_ERROR_HAVE_NO_MEMORY(orig);
  89         curbegin = orig;
  90         curend = strchr(orig, '\\');
  91
  92         if (local_parent->path.elements != NULL) {
  93                 elements = talloc_array(mem_ctx, const char *,
  94                                         str_list_length(local_parent->path.elements) + 1);
  95                 W_ERROR_HAVE_NO_MEMORY(elements);
  96                 for (el = 0; local_parent->path.elements[el] != NULL; el++) {
  97                         elements[el] = talloc_reference(elements,
  98                                                         local_parent->path.elements[el]);
  99                 }
 100                 elements[el] = NULL;
 101         } else {
 102                 elements = NULL;
 103                 el = 0;
 104         }
 105
 106         do {
 107                 if (curend != NULL)
 108                         *curend = '\0';
 109                 elements = talloc_realloc(mem_ctx, elements, const char *, el+2);
 110                 W_ERROR_HAVE_NO_MEMORY(elements);
 111                 elements[el] = talloc_strdup(elements, curbegin);
 112                 W_ERROR_HAVE_NO_MEMORY(elements[el]);
 113                 el++;
 114                 elements[el] = NULL;
 115                 error = hive_get_key_by_name(mem_ctx, curkey,
 116                                              curbegin, &curkey);
 117                 if (!W_ERROR_IS_OK(error)) {
 118                         DEBUG(2, ("Opening key %s failed: %s\n", curbegin,
 119                                 win_errstr(error)));
 120                         talloc_free(orig);
 121                         return error;
 122                 }
 123                 if (curend == NULL)
 124                         break;
 125                 curbegin = curend + 1;
 126                 curend = strchr(curbegin, '\\');
 127         } while (curbegin[0] != '\0');
 128         talloc_free(orig);
 129
 130         *result = reg_import_hive_key(local_parent->global.context, curkey,
 131                                       local_parent->path.predefined_key,
 132                                       talloc_steal(curkey, elements));
 133
 134         return WERR_OK;
 135 }
 136
 137 WERROR local_get_predefined_key(struct registry_context *ctx,
 138                                 uint32_t key_id, struct registry_key **key)
 139 {
 140         struct registry_local *rctx = talloc_get_type(ctx,
 141                                                       struct registry_local);
 142         struct mountpoint *mp;
 143
 144         for (mp = rctx->mountpoints; mp != NULL; mp = mp->next) {
 145                 if (mp->path.predefined_key == key_id &&
 146                         mp->path.elements == NULL)
 147                         break;
 148         }
 149
 150         if (mp == NULL)
 151                 return WERR_FILE_NOT_FOUND;
 152
 153         *key = reg_import_hive_key(ctx, mp->key,
 154                                    mp->path.predefined_key,
 155                                    mp->path.elements);
 156
 157         return WERR_OK;
 158 }
 159
 160 static WERROR local_enum_key(TALLOC_CTX *mem_ctx,
 161                              const struct registry_key *key, uint32_t idx,
 162                              const char **name,
 163                              const char **keyclass,
 164                              NTTIME *last_changed_time)
 165 {
 166         const struct local_key *local = (const struct local_key *)key;
 167
 168         return hive_enum_key(mem_ctx, local->hive_key, idx, name, keyclass,
 169                              last_changed_time);
 170 }
 171
 172 static WERROR local_create_key(TALLOC_CTX *mem_ctx,
 173                                struct registry_key *parent,
 174                                const char *path,
 175                                const char *key_class,
 176                                struct security_descriptor *security,
 177                                struct registry_key **result)
 178 {
 179         char *orig, *curbegin, *curend;
 180         struct local_key *local_parent = talloc_get_type(parent,
 181                                                          struct local_key);
 182         struct hive_key *curkey = local_parent->hive_key;
 183         WERROR error;
 184         const char **elements = NULL;
 185         int el;
 186
 187         if (path == NULL || path[0] == '\0') {
 188                 return WERR_INVALID_PARAMETER;
 189         }
 190
 191         orig = talloc_strdup(mem_ctx, path);
 192         W_ERROR_HAVE_NO_MEMORY(orig);
 193         curbegin = orig;
 194         curend = strchr(orig, '\\');
 195
 196         if (local_parent->path.elements != NULL) {
 197                 elements = talloc_array(mem_ctx, const char *,
 198                                         str_list_length(local_parent->path.elements) + 1);
 199                 W_ERROR_HAVE_NO_MEMORY(elements);
 200                 for (el = 0; local_parent->path.elements[el] != NULL; el++) {
 201                         elements[el] = talloc_reference(elements,
 202                                                         local_parent->path.elements[el]);
 203                 }
 204                 elements[el] = NULL;
 205         } else {
 206                 elements = NULL;
 207                 el = 0;
 208         }
 209
 210         do {
 211                 if (curend != NULL)
 212                         *curend = '\0';
 213                 elements = talloc_realloc(mem_ctx, elements, const char *, el+2);
 214                 W_ERROR_HAVE_NO_MEMORY(elements);
 215                 elements[el] = talloc_strdup(elements, curbegin);
 216                 W_ERROR_HAVE_NO_MEMORY(elements[el]);
 217                 el++;
 218                 elements[el] = NULL;
 219                 error = hive_get_key_by_name(mem_ctx, curkey,
 220                                              curbegin, &curkey);
 221                 if (W_ERROR_EQUAL(error, WERR_FILE_NOT_FOUND)) {
 222                         error = hive_key_add_name(mem_ctx, curkey, curbegin,
 223                                                   key_class, security,
 224                                                   &curkey);
 225                 }
 226                 if (!W_ERROR_IS_OK(error)) {
 227                         DEBUG(2, ("Open/Creation of key %s failed: %s\n",
 228                                 curbegin, win_errstr(error)));
 229                         talloc_free(orig);
 230                         return error;
 231                 }
 232                 if (curend == NULL)
 233                         break;
 234                 curbegin = curend + 1;
 235                 curend = strchr(curbegin, '\\');
 236         } while (curbegin[0] != '\0');
 237         talloc_free(orig);
 238
 239         *result = reg_import_hive_key(local_parent->global.context, curkey,
 240                                       local_parent->path.predefined_key,
 241                                       talloc_steal(curkey, elements));
 242
 243         return WERR_OK;
 244 }
 245
 246 static WERROR local_set_value(struct registry_key *key, const char *name,
 247                               uint32_t type, const DATA_BLOB data)
 248 {
 249         struct local_key *local = (struct local_key *)key;
 250
 251         if (name == NULL) {
 252                 return WERR_INVALID_PARAMETER;
 253         }
 254
 255         return hive_key_set_value(local->hive_key, name, type, data);
 256 }
 257
 258 static WERROR local_get_value(TALLOC_CTX *mem_ctx,
 259                               const struct registry_key *key,
 260                               const char *name, uint32_t *type, DATA_BLOB *data)
 261 {
 262         const struct local_key *local = (const struct local_key *)key;
 263
 264         if (name == NULL) {
 265                 return WERR_INVALID_PARAMETER;
 266         }
 267
 268         return hive_get_value(mem_ctx, local->hive_key, name, type, data);
 269 }
 270
 271 static WERROR local_enum_value(TALLOC_CTX *mem_ctx,
 272                                const struct registry_key *key, uint32_t idx,
 273                                const char **name,
 274                                uint32_t *type,
 275                                DATA_BLOB *data)
 276 {
 277         const struct local_key *local = (const struct local_key *)key;
 278
 279         return hive_get_value_by_index(mem_ctx, local->hive_key, idx,
 280                                        name, type, data);
 281 }
 282
 283 static WERROR local_delete_key(TALLOC_CTX *mem_ctx, struct registry_key *key,
 284                                const char *name)
 285 {
 286         const struct local_key *local = (const struct local_key *)key;
 287
 288         if (name == NULL) {
 289                 return WERR_INVALID_PARAMETER;
 290         }
 291
 292         return hive_key_del(mem_ctx, local->hive_key, name);
 293 }
 294
 295 static WERROR local_delete_value(TALLOC_CTX *mem_ctx, struct registry_key *key,
 296                                  const char *name)
 297 {
 298         const struct local_key *local = (const struct local_key *)key;
 299
 300         if (name == NULL) {
 301                 return WERR_INVALID_PARAMETER;
 302         }
 303
 304         return hive_key_del_value(mem_ctx, local->hive_key, name);
 305 }
 306
 307 static WERROR local_flush_key(struct registry_key *key)
 308 {
 309         const struct local_key *local = (const struct local_key *)key;
 310
 311         return hive_key_flush(local->hive_key);
 312 }
 313
 314 static WERROR local_get_key_info(TALLOC_CTX *mem_ctx,
 315                                  const struct registry_key *key,
 316                                  const char **classname,
 317                                  uint32_t *num_subkeys,
 318                                  uint32_t *num_values,
 319                                  NTTIME *last_change_time,
 320                                  uint32_t *max_subkeynamelen,
 321                                  uint32_t *max_valnamelen,
 322                                  uint32_t *max_valbufsize)
 323 {
 324         const struct local_key *local = (const struct local_key *)key;
 325
 326         return hive_key_get_info(mem_ctx, local->hive_key,
 327                                  classname, num_subkeys, num_values,
 328                                  last_change_time, max_subkeynamelen,
 329                                  max_valnamelen, max_valbufsize);
 330 }
 331 static WERROR local_get_sec_desc(TALLOC_CTX *mem_ctx,
 332                                  const struct registry_key *key,
 333                                  struct security_descriptor **security)
 334 {
 335         const struct local_key *local = (const struct local_key *)key;
 336
 337         return hive_get_sec_desc(mem_ctx, local->hive_key, security);
 338 }
 339 static WERROR local_set_sec_desc(struct registry_key *key,
 340                                  const struct security_descriptor *security)
 341 {
 342         const struct local_key *local = (const struct local_key *)key;
 343
 344         return hive_set_sec_desc(local->hive_key, security);
 345 }
 346 const static struct registry_operations local_ops = {
 347         .name = "local",
 348         .open_key = local_open_key,
 349         .get_predefined_key = local_get_predefined_key,
 350         .enum_key = local_enum_key,
 351         .create_key = local_create_key,
 352         .set_value = local_set_value,
 353         .get_value = local_get_value,
 354         .enum_value = local_enum_value,
 355         .delete_key = local_delete_key,
 356         .delete_value = local_delete_value,
 357         .flush_key = local_flush_key,
 358         .get_key_info = local_get_key_info,
 359         .get_sec_desc = local_get_sec_desc,
 360         .set_sec_desc = local_set_sec_desc,
 361 };
 362
 363 WERROR reg_open_local(TALLOC_CTX *mem_ctx, struct registry_context **ctx)
 364 {
 365         struct registry_local *ret = talloc_zero(mem_ctx,
 366                                                  struct registry_local);
 367
 368         W_ERROR_HAVE_NO_MEMORY(ret);
 369
 370         ret->ops = &local_ops;
 371
 372         *ctx = (struct registry_context *)ret;
 373
 374         return WERR_OK;
 375 }
 376
 377 WERROR reg_mount_hive(struct registry_context *rctx,
 378                       struct hive_key *hive_key,
 379                       uint32_t key_id,
 380                       const char **elements)
 381 {
 382         struct registry_local *reg_local = talloc_get_type(rctx,
 383                                                            struct registry_local);
 384         struct mountpoint *mp;
 385         unsigned int i = 0;
 386
 387         mp = talloc(rctx, struct mountpoint);
 388         W_ERROR_HAVE_NO_MEMORY(mp);
 389         mp->path.predefined_key = key_id;
 390         mp->prev = mp->next = NULL;
 391         mp->key = hive_key;
 392         if (elements != NULL && elements[0] != NULL) {
 393                 mp->path.elements = talloc_array(mp, const char *,
 394                                                  str_list_length(elements));
 395                 W_ERROR_HAVE_NO_MEMORY(mp->path.elements);
 396                 for (i = 0; elements[i] != NULL; i++) {
 397                         mp->path.elements[i] = talloc_reference(mp->path.elements,
 398                                                                 elements[i]);
 399                 }
 400                 mp->path.elements[i] = NULL;
 401         } else {
 402                 mp->path.elements = NULL;
 403         }
 404
 405         DLIST_ADD(reg_local->mountpoints, mp);
 406
 407         return WERR_OK;
 408 }