source3/libgpo/gpext/registry.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  Group Policy Support
   4  *  Copyright (C) Guenther Deschner 2007-2008,2010
   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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21 #include "../libgpo/gpo_ini.h"
  22 #include "../libgpo/gpo.h"
  23 #include "libgpo/gpo_proto.h"
  24 #include "registry.h"
  25 #include "../librpc/gen_ndr/ndr_preg.h"
  26 #include "libgpo/gpext/gpext.h"
  27
  28 #define GP_EXT_NAME "registry"
  29
  30 /* more info can be found at:
  31  * http://msdn2.microsoft.com/en-us/library/aa374407.aspx */
  32
  33 #define GP_REGPOL_FILE  "Registry.pol"
  34
  35 #define GP_REGPOL_FILE_SIGNATURE 0x67655250 /* 'PReg' */
  36 #define GP_REGPOL_FILE_VERSION 1
  37
  38 static TALLOC_CTX *ctx = NULL;
  39
  40 NTSTATUS gpext_registry_init(TALLOC_CTX *mem_ctx);
  41
  42 /****************************************************************
  43 ****************************************************************/
  44
  45 static bool reg_parse_value(TALLOC_CTX *mem_ctx,
  46                             const char **value,
  47                             enum gp_reg_action *action)
  48 {
  49         if (!*value) {
  50                 *action = GP_REG_ACTION_ADD_KEY;
  51                 return true;
  52         }
  53
  54         if (strncmp(*value, "**", 2) != 0) {
  55                 *action = GP_REG_ACTION_ADD_VALUE;
  56                 return true;
  57         }
  58
  59         if (strnequal(*value, "**DelVals.", 10)) {
  60                 *action = GP_REG_ACTION_DEL_ALL_VALUES;
  61                 return true;
  62         }
  63
  64         if (strnequal(*value, "**Del.", 6)) {
  65                 *value = talloc_strdup(mem_ctx, *value + 6);
  66                 *action = GP_REG_ACTION_DEL_VALUE;
  67                 return true;
  68         }
  69
  70         if (strnequal(*value, "**SecureKey", 11)) {
  71                 if (strnequal(*value, "**SecureKey=1", 13)) {
  72                         *action = GP_REG_ACTION_SEC_KEY_SET;
  73                         return true;
  74                 }
  75
  76  /*************** not tested from here on ***************/
  77                 if (strnequal(*value, "**SecureKey=0", 13)) {
  78                         smb_panic("not supported: **SecureKey=0");
  79                         *action = GP_REG_ACTION_SEC_KEY_RESET;
  80                         return true;
  81                 }
  82                 DEBUG(0,("unknown: SecureKey: %s\n", *value));
  83                 smb_panic("not supported SecureKey method");
  84                 return false;
  85         }
  86
  87         if (strnequal(*value, "**DeleteValues", strlen("**DeleteValues"))) {
  88                 smb_panic("not supported: **DeleteValues");
  89                 *action = GP_REG_ACTION_DEL_VALUES;
  90                 return false;
  91         }
  92
  93         if (strnequal(*value, "**DeleteKeys", strlen("**DeleteKeys"))) {
  94                 smb_panic("not supported: **DeleteKeys");
  95                 *action = GP_REG_ACTION_DEL_KEYS;
  96                 return false;
  97         }
  98
  99         DEBUG(0,("unknown value: %s\n", *value));
 100         smb_panic(*value);
 101         return false;
 102 }
 103
 104 /****************************************************************
 105 ****************************************************************/
 106
 107 static bool gp_reg_entry_from_file_entry(TALLOC_CTX *mem_ctx,
 108                                          struct preg_entry *r,
 109                                          struct gp_registry_entry **reg_entry)
 110 {
 111         struct registry_value *data = NULL;
 112         struct gp_registry_entry *entry = NULL;
 113         enum gp_reg_action action = GP_REG_ACTION_NONE;
 114         enum ndr_err_code ndr_err;
 115
 116         ZERO_STRUCTP(*reg_entry);
 117
 118         data = talloc_zero(mem_ctx, struct registry_value);
 119         if (!data)
 120                 return false;
 121
 122         data->type = r->type;
 123
 124         ndr_err = ndr_push_union_blob(
 125                 &data->data,
 126                 mem_ctx,
 127                 &r->data,
 128                 r->type,
 129                 (ndr_push_flags_fn_t)ndr_push_winreg_Data);
 130         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 131                 DBG_WARNING("ndr_push_winreg_Data failed: %s\n",
 132                             ndr_errstr(ndr_err));
 133                 return false;
 134         }
 135
 136         entry = talloc_zero(mem_ctx, struct gp_registry_entry);
 137         if (!entry)
 138                 return false;
 139
 140         if (!reg_parse_value(mem_ctx, &r->valuename, &action))
 141                 return false;
 142
 143         entry->key = talloc_strdup(entry, r->keyname);
 144         entry->value = talloc_strdup(entry, r->valuename);
 145         entry->data = data;
 146         entry->action = action;
 147
 148         *reg_entry = entry;
 149
 150         return true;
 151 }
 152
 153 /****************************************************************
 154 ****************************************************************/
 155
 156 static NTSTATUS reg_parse_registry(TALLOC_CTX *mem_ctx,
 157                                    uint32_t flags,
 158                                    const char *filename,
 159                                    struct gp_registry_entry **entries_p,
 160                                    size_t *num_entries_p)
 161 {
 162         DATA_BLOB blob;
 163         NTSTATUS status;
 164         enum ndr_err_code ndr_err;
 165         const char *real_filename = NULL;
 166         struct preg_file r;
 167         struct gp_registry_entry *entries = NULL;
 168         size_t num_entries = 0;
 169         int i;
 170
 171         status = gp_find_file(mem_ctx,
 172                               flags,
 173                               filename,
 174                               GP_REGPOL_FILE,
 175                               &real_filename);
 176         if (!NT_STATUS_IS_OK(status)) {
 177                 return status;
 178         }
 179
 180         blob.data = (uint8_t *)file_load(real_filename, &blob.length, 0, NULL);
 181         if (!blob.data) {
 182                 return NT_STATUS_CANNOT_LOAD_REGISTRY_FILE;
 183         }
 184
 185         ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &r,
 186                         (ndr_pull_flags_fn_t)ndr_pull_preg_file);
 187         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 188                 status = ndr_map_error2ntstatus(ndr_err);
 189                 goto out;
 190         }
 191
 192         if (flags & GPO_INFO_FLAG_VERBOSE) {
 193                 NDR_PRINT_DEBUG(preg_file, &r);
 194         }
 195
 196         if (!strequal(r.header.signature, "PReg")) {
 197                 status = NT_STATUS_INVALID_PARAMETER;
 198                 goto out;
 199         }
 200
 201         if (r.header.version != GP_REGPOL_FILE_VERSION) {
 202                 status = NT_STATUS_INVALID_PARAMETER;
 203                 goto out;
 204         }
 205
 206         for (i=0; i < r.num_entries; i++) {
 207
 208                 struct gp_registry_entry *r_entry = NULL;
 209
 210                 if (!gp_reg_entry_from_file_entry(mem_ctx,
 211                                                   &r.entries[i],
 212                                                   &r_entry)) {
 213                         status = NT_STATUS_NO_MEMORY;
 214                         goto out;
 215                 }
 216
 217                 if (!add_gp_registry_entry_to_array(mem_ctx,
 218                                                     r_entry,
 219                                                     &entries,
 220                                                     &num_entries)) {
 221                         status = NT_STATUS_NO_MEMORY;
 222                         goto out;
 223                 }
 224         }
 225
 226         *entries_p = entries;
 227         *num_entries_p = num_entries;
 228
 229         status = NT_STATUS_OK;
 230
 231  out:
 232         data_blob_free(&blob);
 233         return status;
 234 }
 235
 236 /****************************************************************
 237 ****************************************************************/
 238
 239 static WERROR reg_apply_registry(TALLOC_CTX *mem_ctx,
 240                                  const struct security_token *token,
 241                                  struct registry_key *root_key,
 242                                  uint32_t flags,
 243                                  struct gp_registry_entry *entries,
 244                                  size_t num_entries)
 245 {
 246         struct gp_registry_context *reg_ctx = NULL;
 247         WERROR werr;
 248         size_t i;
 249
 250         if (num_entries == 0) {
 251                 return WERR_OK;
 252         }
 253
 254 #if 0
 255         if (flags & GPO_LIST_FLAG_MACHINE) {
 256                 werr = gp_init_reg_ctx(mem_ctx, KEY_HKLM, REG_KEY_WRITE,
 257                                        get_system_token(),
 258                                        &reg_ctx);
 259         } else {
 260                 werr = gp_init_reg_ctx(mem_ctx, KEY_HKCU, REG_KEY_WRITE,
 261                                        token,
 262                                        &reg_ctx);
 263         }
 264         W_ERROR_NOT_OK_RETURN(werr);
 265 #endif
 266         for (i=0; i<num_entries; i++) {
 267
 268                 /* FIXME: maybe we should check here if we attempt to go beyond
 269                  * the 4 allowed reg keys */
 270
 271                 werr = reg_apply_registry_entry(mem_ctx, root_key,
 272                                                 reg_ctx,
 273                                                 &(entries)[i],
 274                                                 token, flags);
 275                 if (!W_ERROR_IS_OK(werr)) {
 276                         DEBUG(0,("failed to apply registry: %s\n",
 277                                 win_errstr(werr)));
 278                         goto done;
 279                 }
 280         }
 281
 282 done:
 283         gp_free_reg_ctx(reg_ctx);
 284         return werr;
 285 }
 286
 287
 288 /****************************************************************
 289 ****************************************************************/
 290
 291 static NTSTATUS registry_process_group_policy(TALLOC_CTX *mem_ctx,
 292                                               uint32_t flags,
 293                                               struct registry_key *root_key,
 294                                               const struct security_token *token,
 295                                               const struct GROUP_POLICY_OBJECT *deleted_gpo_list,
 296                                               const struct GROUP_POLICY_OBJECT *changed_gpo_list)
 297 {
 298         NTSTATUS status;
 299         WERROR werr;
 300         struct gp_registry_entry *entries = NULL;
 301         size_t num_entries = 0;
 302         char *unix_path = NULL;
 303         const struct GROUP_POLICY_OBJECT *gpo;
 304         char *gpo_cache_path = cache_path(talloc_tos(), GPO_CACHE_DIR);
 305         if (gpo_cache_path == NULL) {
 306                 return NT_STATUS_NO_MEMORY;
 307         }
 308
 309         /* implementation of the policy callback function, see
 310          * http://msdn.microsoft.com/en-us/library/aa373494%28v=vs.85%29.aspx
 311          * for details - gd */
 312
 313         /* for now do not process the list of deleted group policies
 314
 315         for (gpo = deleted_gpo_list; gpo; gpo = gpo->next) {
 316         }
 317
 318         */
 319
 320         for (gpo = changed_gpo_list; gpo; gpo = gpo->next) {
 321
 322                 gpext_debug_header(0, "registry_process_group_policy", flags,
 323                                    gpo, GP_EXT_GUID_REGISTRY, NULL);
 324
 325                 status = gpo_get_unix_path(mem_ctx, gpo_cache_path,
 326                                            gpo, &unix_path);
 327                 if (!NT_STATUS_IS_OK(status)) {
 328                         goto err_cache_path_free;
 329                 }
 330
 331                 status = reg_parse_registry(mem_ctx,
 332                                             flags,
 333                                             unix_path,
 334                                             &entries,
 335                                             &num_entries);
 336                 if (!NT_STATUS_IS_OK(status)) {
 337                         DEBUG(0,("failed to parse registry: %s\n",
 338                                 nt_errstr(status)));
 339                         goto err_cache_path_free;
 340                 }
 341
 342                 dump_reg_entries(flags, "READ", entries, num_entries);
 343
 344                 werr = reg_apply_registry(mem_ctx, token, root_key, flags,
 345                                           entries, num_entries);
 346                 if (!W_ERROR_IS_OK(werr)) {
 347                         DEBUG(0,("failed to apply registry: %s\n",
 348                                 win_errstr(werr)));
 349                         status = werror_to_ntstatus(werr);
 350                         goto err_cache_path_free;
 351                 }
 352         }
 353         status = NT_STATUS_OK;
 354
 355 err_cache_path_free:
 356         talloc_free(gpo_cache_path);
 357         talloc_free(entries);
 358         return status;
 359 }
 360
 361 /****************************************************************
 362 ****************************************************************/
 363
 364 static NTSTATUS registry_get_reg_config(TALLOC_CTX *mem_ctx,
 365                                         struct gp_extension_reg_info **reg_info)
 366 {
 367         NTSTATUS status;
 368         struct gp_extension_reg_info *info = NULL;
 369         struct gp_extension_reg_table table[] = {
 370                 { "ProcessGroupPolicy", REG_SZ, "registry_process_group_policy" },
 371                 { NULL, REG_NONE, NULL }
 372         };
 373
 374         info = talloc_zero(mem_ctx, struct gp_extension_reg_info);
 375         NT_STATUS_HAVE_NO_MEMORY(info);
 376
 377         status = gpext_info_add_entry(mem_ctx, GP_EXT_NAME,
 378                                       GP_EXT_GUID_REGISTRY,
 379                                       table, info);
 380         NT_STATUS_NOT_OK_RETURN(status);
 381
 382         *reg_info = info;
 383
 384         return NT_STATUS_OK;
 385 }
 386
 387 /****************************************************************
 388 ****************************************************************/
 389
 390 static NTSTATUS registry_initialize(TALLOC_CTX *mem_ctx)
 391 {
 392         return NT_STATUS_OK;
 393 }
 394
 395 /****************************************************************
 396 ****************************************************************/
 397
 398 static NTSTATUS registry_shutdown(void)
 399 {
 400         NTSTATUS status;
 401
 402         status = gpext_unregister_gp_extension(GP_EXT_NAME);
 403         if (NT_STATUS_IS_OK(status)) {
 404                 return status;
 405         }
 406
 407         TALLOC_FREE(ctx);
 408
 409         return NT_STATUS_OK;
 410 }
 411
 412 /****************************************************************
 413 ****************************************************************/
 414
 415 static struct gp_extension_methods registry_methods = {
 416         .initialize             = registry_initialize,
 417         .process_group_policy   = registry_process_group_policy,
 418         .get_reg_config         = registry_get_reg_config,
 419         .shutdown               = registry_shutdown
 420 };
 421
 422 /****************************************************************
 423 ****************************************************************/
 424
 425 NTSTATUS gpext_registry_init(TALLOC_CTX *mem_ctx)
 426 {
 427         NTSTATUS status;
 428
 429         ctx = talloc_init("gpext_registry_init");
 430         NT_STATUS_HAVE_NO_MEMORY(ctx);
 431
 432         status = gpext_register_gp_extension(ctx, SMB_GPEXT_INTERFACE_VERSION,
 433                                              GP_EXT_NAME, GP_EXT_GUID_REGISTRY,
 434                                              &registry_methods);
 435         if (!NT_STATUS_IS_OK(status)) {
 436                 TALLOC_FREE(ctx);
 437         }
 438
 439         return status;
 440 }