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         local_key->hive_key = talloc_steal(local_key, hive);
  61         local_key->global.context = talloc_reference(local_key, ctx);
  62         local_key->path = parent_path;
  63
  64         return (struct registry_key *)local_key;
  65 }
  66
  67
  68 static WERROR local_open_key(TALLOC_CTX *mem_ctx,
  69                              struct registry_key *parent,
  70                              const char *path,
  71                              struct registry_key **result)
  72 {
  73         char *orig = talloc_strdup(mem_ctx, path),
  74                  *curbegin = orig,
  75                  *curend = strchr(orig, '\\');
  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 (local_parent->path.elements != NULL) {
  84                 elements = talloc_array(mem_ctx, const char *,
  85                                         str_list_length(local_parent->path.elements) + 1);
  86                 for (el = 0; local_parent->path.elements[el] != NULL; el++) {
  87                         elements[el] = talloc_reference(elements,
  88                                                         local_parent->path.elements[el]);
  89                 }
  90                 elements[el] = NULL;
  91         } else {
  92                 elements = NULL;
  93                 el = 0;
  94         }
  95
  96         while (curbegin != NULL && *curbegin) {
  97                 if (curend != NULL)
  98                         *curend = '\0';
  99                 elements = talloc_realloc(mem_ctx, elements, const char *, el+2);
 100                 elements[el] = talloc_strdup(elements, curbegin);
 101                 el++;
 102                 elements[el] = NULL;
 103                 error = hive_get_key_by_name(mem_ctx, curkey,
 104                                              curbegin, &curkey);
 105                 if (!W_ERROR_IS_OK(error)) {
 106                         DEBUG(2, ("Opening key %s failed: %s\n", curbegin,
 107                                 win_errstr(error)));
 108                         talloc_free(orig);
 109                         return error;
 110                 }
 111                 if (curend == NULL)
 112                         break;
 113                 curbegin = curend + 1;
 114                 curend = strchr(curbegin, '\\');
 115         }
 116         talloc_free(orig);
 117
 118         *result = reg_import_hive_key(local_parent->global.context, curkey,
 119                                       local_parent->path.predefined_key,
 120                                       talloc_steal(curkey, elements));
 121
 122         return WERR_OK;
 123 }
 124
 125 WERROR local_get_predefined_key(struct registry_context *ctx,
 126                                 uint32_t key_id, struct registry_key **key)
 127 {
 128         struct registry_local *rctx = talloc_get_type(ctx,
 129                                                       struct registry_local);
 130         struct mountpoint *mp;
 131
 132         for (mp = rctx->mountpoints; mp != NULL; mp = mp->next) {
 133                 if (mp->path.predefined_key == key_id &&
 134                         mp->path.elements == NULL)
 135                         break;
 136         }
 137
 138         if (mp == NULL)
 139                 return WERR_BADFILE;
 140
 141         *key = reg_import_hive_key(ctx, mp->key,
 142                                    mp->path.predefined_key,
 143                                    mp->path.elements);
 144
 145         return WERR_OK;
 146 }
 147
 148 static WERROR local_enum_key(TALLOC_CTX *mem_ctx,
 149                              const struct registry_key *key, uint32_t idx,
 150                              const char **name,
 151                              const char **keyclass,
 152                              NTTIME *last_changed_time)
 153 {
 154         const struct local_key *local = (const struct local_key *)key;
 155
 156         return hive_enum_key(mem_ctx, local->hive_key, idx, name, keyclass,
 157                              last_changed_time);
 158 }
 159
 160 static WERROR local_create_key(TALLOC_CTX *mem_ctx,
 161                                struct registry_key *parent_key,
 162                                const char *name,
 163                                const char *key_class,
 164                                struct security_descriptor *security,
 165                                struct registry_key **key)
 166 {
 167         struct local_key *local_parent;
 168         struct hive_key *hivekey;
 169         const char **elements;
 170         int i;
 171         const char *last_part;
 172
 173         last_part = strrchr(name, '\\');
 174         if (last_part == NULL) {
 175                 last_part = name;
 176                 local_parent = (struct local_key *)parent_key;
 177         } else {
 178                 W_ERROR_NOT_OK_RETURN(reg_open_key(mem_ctx, parent_key,
 179                                                    talloc_strndup(mem_ctx, name, last_part-name),
 180                                                    (struct registry_key **)&local_parent));
 181                 last_part++;
 182         }
 183
 184         W_ERROR_NOT_OK_RETURN(hive_key_add_name(mem_ctx, local_parent->hive_key,
 185                                                 last_part, key_class, security,
 186                                                 &hivekey));
 187
 188         if (local_parent->path.elements != NULL) {
 189                 elements = talloc_array(hivekey, const char *,
 190                                         str_list_length(local_parent->path.elements)+2);
 191                 for (i = 0; local_parent->path.elements[i] != NULL; i++) {
 192                         elements[i] = talloc_reference(elements,
 193                                                        local_parent->path.elements[i]);
 194                 }
 195         } else {
 196                 elements = talloc_array(hivekey, const char *, 2);
 197                 i = 0;
 198         }
 199
 200         elements[i] = talloc_strdup(elements, name);
 201         elements[i+1] = NULL;
 202
 203         *key = reg_import_hive_key(local_parent->global.context, hivekey,
 204                                    local_parent->path.predefined_key,
 205                                    elements);
 206
 207         return WERR_OK;
 208 }
 209
 210 static WERROR local_set_value(struct registry_key *key, const char *name,
 211                               uint32_t type, const DATA_BLOB data)
 212 {
 213         struct local_key *local = (struct local_key *)key;
 214
 215         return hive_key_set_value(local->hive_key, name, type, data);
 216 }
 217
 218 static WERROR local_get_value(TALLOC_CTX *mem_ctx,
 219                               const struct registry_key *key,
 220                               const char *name, uint32_t *type, DATA_BLOB *data)
 221 {
 222         const struct local_key *local = (const struct local_key *)key;
 223
 224         return hive_get_value(mem_ctx, local->hive_key, name, type, data);
 225 }
 226
 227 static WERROR local_enum_value(TALLOC_CTX *mem_ctx,
 228                                const struct registry_key *key, uint32_t idx,
 229                                const char **name,
 230                                uint32_t *type,
 231                                DATA_BLOB *data)
 232 {
 233         const struct local_key *local = (const struct local_key *)key;
 234
 235         return hive_get_value_by_index(mem_ctx, local->hive_key, idx,
 236                                        name, type, data);
 237 }
 238
 239 static WERROR local_delete_key(struct registry_key *key, const char *name)
 240 {
 241         const struct local_key *local = (const struct local_key *)key;
 242
 243         return hive_key_del(local->hive_key, name);
 244 }
 245
 246 static WERROR local_delete_value(struct registry_key *key, const char *name)
 247 {
 248         const struct local_key *local = (const struct local_key *)key;
 249
 250         return hive_key_del_value(local->hive_key, name);
 251 }
 252
 253 static WERROR local_flush_key(struct registry_key *key)
 254 {
 255         const struct local_key *local = (const struct local_key *)key;
 256
 257         return hive_key_flush(local->hive_key);
 258 }
 259
 260 static WERROR local_get_key_info(TALLOC_CTX *mem_ctx,
 261                                  const struct registry_key *key,
 262                                  const char **classname,
 263                                  uint32_t *num_subkeys,
 264                                  uint32_t *num_values,
 265                                  NTTIME *last_change_time,
 266                                  uint32_t *max_subkeynamelen,
 267                                  uint32_t *max_valnamelen,
 268                                  uint32_t *max_valbufsize)
 269 {
 270         const struct local_key *local = (const struct local_key *)key;
 271
 272         return hive_key_get_info(mem_ctx, local->hive_key,
 273                                  classname, num_subkeys, num_values,
 274                                  last_change_time, max_subkeynamelen,
 275                                  max_valnamelen, max_valbufsize);
 276 }
 277 static WERROR local_get_sec_desc(TALLOC_CTX *mem_ctx,
 278                                  const struct registry_key *key,
 279                                  struct security_descriptor **security)
 280 {
 281         const struct local_key *local = (const struct local_key *)key;
 282
 283         return hive_get_sec_desc(mem_ctx, local->hive_key, security);
 284 }
 285 static WERROR local_set_sec_desc(struct registry_key *key,
 286                                  const struct security_descriptor *security)
 287 {
 288         const struct local_key *local = (const struct local_key *)key;
 289
 290         return hive_set_sec_desc(local->hive_key, security);
 291 }
 292 const static struct registry_operations local_ops = {
 293         .name = "local",
 294         .open_key = local_open_key,
 295         .get_predefined_key = local_get_predefined_key,
 296         .enum_key = local_enum_key,
 297         .create_key = local_create_key,
 298         .set_value = local_set_value,
 299         .get_value = local_get_value,
 300         .enum_value = local_enum_value,
 301         .delete_key = local_delete_key,
 302         .delete_value = local_delete_value,
 303         .flush_key = local_flush_key,
 304         .get_key_info = local_get_key_info,
 305         .get_sec_desc = local_get_sec_desc,
 306         .set_sec_desc = local_set_sec_desc,
 307 };
 308
 309 WERROR reg_open_local(TALLOC_CTX *mem_ctx, struct registry_context **ctx)
 310 {
 311         struct registry_local *ret = talloc_zero(mem_ctx,
 312                                                  struct registry_local);
 313
 314         W_ERROR_HAVE_NO_MEMORY(ret);
 315
 316         ret->ops = &local_ops;
 317
 318         *ctx = (struct registry_context *)ret;
 319
 320         return WERR_OK;
 321 }
 322
 323 WERROR reg_mount_hive(struct registry_context *rctx,
 324                       struct hive_key *hive_key,
 325                       uint32_t key_id,
 326                       const char **elements)
 327 {
 328         struct registry_local *reg_local = talloc_get_type(rctx,
 329                                                            struct registry_local);
 330         struct mountpoint *mp = talloc(rctx, struct mountpoint);
 331         int i = 0;
 332
 333         mp->path.predefined_key = key_id;
 334         mp->prev = mp->next = NULL;
 335         mp->key = hive_key;
 336         if (elements != NULL && str_list_length(elements) != 0) {
 337                 mp->path.elements = talloc_array(mp, const char *,
 338                                                  str_list_length(elements));
 339                 for (i = 0; elements[i] != NULL; i++) {
 340                         mp->path.elements[i] = talloc_reference(mp->path.elements,
 341                                                                 elements[i]);
 342                 }
 343                 mp->path.elements[i] = NULL;
 344         } else {
 345                 mp->path.elements = NULL;
 346         }
 347
 348         DLIST_ADD(reg_local->mountpoints, mp);
 349
 350         return WERR_OK;
 351 }