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
 115         ZERO_STRUCTP(*reg_entry);
 116
 117         data = talloc_zero(mem_ctx, struct registry_value);
 118         if (!data)
 119                 return false;
 120
 121         data->type = r->type;
 122         data->data = data_blob_talloc(data, r->data, r->size);
 123
 124         entry = talloc_zero(mem_ctx, struct gp_registry_entry);
 125         if (!entry)
 126                 return false;
 127
 128         if (!reg_parse_value(mem_ctx, &r->valuename, &action))
 129                 return false;
 130
 131         entry->key = talloc_strdup(entry, r->keyname);
 132         entry->value = talloc_strdup(entry, r->valuename);
 133         entry->data = data;
 134         entry->action = action;
 135
 136         *reg_entry = entry;
 137
 138         return true;
 139 }
 140
 141 /****************************************************************
 142 ****************************************************************/
 143
 144 static NTSTATUS reg_parse_registry(TALLOC_CTX *mem_ctx,
 145                                    uint32_t flags,
 146                                    const char *filename,
 147                                    struct gp_registry_entry **entries_p,
 148                                    size_t *num_entries_p)
 149 {
 150         DATA_BLOB blob;
 151         NTSTATUS status;
 152         enum ndr_err_code ndr_err;
 153         const char *real_filename = NULL;
 154         struct preg_file r;
 155         struct gp_registry_entry *entries = NULL;
 156         size_t num_entries = 0;
 157         int i;
 158
 159         status = gp_find_file(mem_ctx,
 160                               flags,
 161                               filename,
 162                               GP_REGPOL_FILE,
 163                               &real_filename);
 164         if (!NT_STATUS_IS_OK(status)) {
 165                 return status;
 166         }
 167
 168         blob.data = (uint8_t *)file_load(real_filename, &blob.length, 0, NULL);
 169         if (!blob.data) {
 170                 return NT_STATUS_CANNOT_LOAD_REGISTRY_FILE;
 171         }
 172
 173         ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &r,
 174                         (ndr_pull_flags_fn_t)ndr_pull_preg_file);
 175         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 176                 status = ndr_map_error2ntstatus(ndr_err);
 177                 goto out;
 178         }
 179
 180         if (flags & GPO_INFO_FLAG_VERBOSE) {
 181                 NDR_PRINT_DEBUG(preg_file, &r);
 182         }
 183
 184         if (!strequal(r.header.signature, "PReg")) {
 185                 status = NT_STATUS_INVALID_PARAMETER;
 186                 goto out;
 187         }
 188
 189         if (r.header.version != GP_REGPOL_FILE_VERSION) {
 190                 status = NT_STATUS_INVALID_PARAMETER;
 191                 goto out;
 192         }
 193
 194         for (i=0; i < r.num_entries; i++) {
 195
 196                 struct gp_registry_entry *r_entry = NULL;
 197
 198                 if (!gp_reg_entry_from_file_entry(mem_ctx,
 199                                                   &r.entries[i],
 200                                                   &r_entry)) {
 201                         status = NT_STATUS_NO_MEMORY;
 202                         goto out;
 203                 }
 204
 205                 if (!add_gp_registry_entry_to_array(mem_ctx,
 206                                                     r_entry,
 207                                                     &entries,
 208                                                     &num_entries)) {
 209                         status = NT_STATUS_NO_MEMORY;
 210                         goto out;
 211                 }
 212         }
 213
 214         *entries_p = entries;
 215         *num_entries_p = num_entries;
 216
 217         status = NT_STATUS_OK;
 218
 219  out:
 220         data_blob_free(&blob);
 221         return status;
 222 }
 223
 224 /****************************************************************
 225 ****************************************************************/
 226
 227 static WERROR reg_apply_registry(TALLOC_CTX *mem_ctx,
 228                                  const struct security_token *token,
 229                                  struct registry_key *root_key,
 230                                  uint32_t flags,
 231                                  struct gp_registry_entry *entries,
 232                                  size_t num_entries)
 233 {
 234         struct gp_registry_context *reg_ctx = NULL;
 235         WERROR werr;
 236         size_t i;
 237
 238         if (num_entries == 0) {
 239                 return WERR_OK;
 240         }
 241
 242 #if 0
 243         if (flags & GPO_LIST_FLAG_MACHINE) {
 244                 werr = gp_init_reg_ctx(mem_ctx, KEY_HKLM, REG_KEY_WRITE,
 245                                        get_system_token(),
 246                                        &reg_ctx);
 247         } else {
 248                 werr = gp_init_reg_ctx(mem_ctx, KEY_HKCU, REG_KEY_WRITE,
 249                                        token,
 250                                        &reg_ctx);
 251         }
 252         W_ERROR_NOT_OK_RETURN(werr);
 253 #endif
 254         for (i=0; i<num_entries; i++) {
 255
 256                 /* FIXME: maybe we should check here if we attempt to go beyond
 257                  * the 4 allowed reg keys */
 258
 259                 werr = reg_apply_registry_entry(mem_ctx, root_key,
 260                                                 reg_ctx,
 261                                                 &(entries)[i],
 262                                                 token, flags);
 263                 if (!W_ERROR_IS_OK(werr)) {
 264                         DEBUG(0,("failed to apply registry: %s\n",
 265                                 win_errstr(werr)));
 266                         goto done;
 267                 }
 268         }
 269
 270 done:
 271         gp_free_reg_ctx(reg_ctx);
 272         return werr;
 273 }
 274
 275
 276 /****************************************************************
 277 ****************************************************************/
 278
 279 static NTSTATUS registry_process_group_policy(TALLOC_CTX *mem_ctx,
 280                                               uint32_t flags,
 281                                               struct registry_key *root_key,
 282                                               const struct security_token *token,
 283                                               const struct GROUP_POLICY_OBJECT *deleted_gpo_list,
 284                                               const struct GROUP_POLICY_OBJECT *changed_gpo_list)
 285 {
 286         NTSTATUS status;
 287         WERROR werr;
 288         struct gp_registry_entry *entries = NULL;
 289         size_t num_entries = 0;
 290         char *unix_path = NULL;
 291         const struct GROUP_POLICY_OBJECT *gpo;
 292         char *gpo_cache_path = cache_path(GPO_CACHE_DIR);
 293         if (gpo_cache_path == NULL) {
 294                 return NT_STATUS_NO_MEMORY;
 295         }
 296
 297         /* implementation of the policy callback function, see
 298          * http://msdn.microsoft.com/en-us/library/aa373494%28v=vs.85%29.aspx
 299          * for details - gd */
 300
 301         /* for now do not process the list of deleted group policies
 302
 303         for (gpo = deleted_gpo_list; gpo; gpo = gpo->next) {
 304         }
 305
 306         */
 307
 308         for (gpo = changed_gpo_list; gpo; gpo = gpo->next) {
 309
 310                 gpext_debug_header(0, "registry_process_group_policy", flags,
 311                                    gpo, GP_EXT_GUID_REGISTRY, NULL);
 312
 313                 status = gpo_get_unix_path(mem_ctx, gpo_cache_path,
 314                                            gpo, &unix_path);
 315                 if (!NT_STATUS_IS_OK(status)) {
 316                         goto err_cache_path_free;
 317                 }
 318
 319                 status = reg_parse_registry(mem_ctx,
 320                                             flags,
 321                                             unix_path,
 322                                             &entries,
 323                                             &num_entries);
 324                 if (!NT_STATUS_IS_OK(status)) {
 325                         DEBUG(0,("failed to parse registry: %s\n",
 326                                 nt_errstr(status)));
 327                         goto err_cache_path_free;
 328                 }
 329
 330                 dump_reg_entries(flags, "READ", entries, num_entries);
 331
 332                 werr = reg_apply_registry(mem_ctx, token, root_key, flags,
 333                                           entries, num_entries);
 334                 if (!W_ERROR_IS_OK(werr)) {
 335                         DEBUG(0,("failed to apply registry: %s\n",
 336                                 win_errstr(werr)));
 337                         status = werror_to_ntstatus(werr);
 338                         goto err_cache_path_free;
 339                 }
 340         }
 341         status = NT_STATUS_OK;
 342
 343 err_cache_path_free:
 344         talloc_free(gpo_cache_path);
 345         talloc_free(entries);
 346         return status;
 347 }
 348
 349 /****************************************************************
 350 ****************************************************************/
 351
 352 static NTSTATUS registry_get_reg_config(TALLOC_CTX *mem_ctx,
 353                                         struct gp_extension_reg_info **reg_info)
 354 {
 355         NTSTATUS status;
 356         struct gp_extension_reg_info *info = NULL;
 357         struct gp_extension_reg_table table[] = {
 358                 { "ProcessGroupPolicy", REG_SZ, "registry_process_group_policy" },
 359                 { NULL, REG_NONE, NULL }
 360         };
 361
 362         info = talloc_zero(mem_ctx, struct gp_extension_reg_info);
 363         NT_STATUS_HAVE_NO_MEMORY(info);
 364
 365         status = gpext_info_add_entry(mem_ctx, GP_EXT_NAME,
 366                                       GP_EXT_GUID_REGISTRY,
 367                                       table, info);
 368         NT_STATUS_NOT_OK_RETURN(status);
 369
 370         *reg_info = info;
 371
 372         return NT_STATUS_OK;
 373 }
 374
 375 /****************************************************************
 376 ****************************************************************/
 377
 378 static NTSTATUS registry_initialize(TALLOC_CTX *mem_ctx)
 379 {
 380         return NT_STATUS_OK;
 381 }
 382
 383 /****************************************************************
 384 ****************************************************************/
 385
 386 static NTSTATUS registry_shutdown(void)
 387 {
 388         NTSTATUS status;
 389
 390         status = gpext_unregister_gp_extension(GP_EXT_NAME);
 391         if (NT_STATUS_IS_OK(status)) {
 392                 return status;
 393         }
 394
 395         TALLOC_FREE(ctx);
 396
 397         return NT_STATUS_OK;
 398 }
 399
 400 /****************************************************************
 401 ****************************************************************/
 402
 403 static struct gp_extension_methods registry_methods = {
 404         .initialize             = registry_initialize,
 405         .process_group_policy   = registry_process_group_policy,
 406         .get_reg_config         = registry_get_reg_config,
 407         .shutdown               = registry_shutdown
 408 };
 409
 410 /****************************************************************
 411 ****************************************************************/
 412
 413 NTSTATUS gpext_registry_init(TALLOC_CTX *mem_ctx)
 414 {
 415         NTSTATUS status;
 416
 417         ctx = talloc_init("gpext_registry_init");
 418         NT_STATUS_HAVE_NO_MEMORY(ctx);
 419
 420         status = gpext_register_gp_extension(ctx, SMB_GPEXT_INTERFACE_VERSION,
 421                                              GP_EXT_NAME, GP_EXT_GUID_REGISTRY,
 422                                              &registry_methods);
 423         if (!NT_STATUS_IS_OK(status)) {
 424                 TALLOC_FREE(ctx);
 425         }
 426
 427         return status;
 428 }