source4/dsdb/schema/schema_set.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    DSDB schema header
   4
   5    Copyright (C) Stefan Metzmacher <metze@samba.org> 2006-2007
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2006-2008
   7    Copyright (C) Matthieu Patou <mat@matws.net> 2011
   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
  24 #include "includes.h"
  25 #include "lib/util/dlinklist.h"
  26 #include "dsdb/samdb/samdb.h"
  27 #include <ldb_module.h>
  28 #include "param/param.h"
  29 #include "librpc/ndr/libndr.h"
  30 #include "librpc/gen_ndr/ndr_misc.h"
  31 #include "lib/util/tsort.h"
  32
  33 /* change this when we change something in our schema code that
  34  * requires a re-index of the database
  35  */
  36 #define SAMDB_INDEXING_VERSION "2"
  37
  38 /*
  39   override the name to attribute handler function
  40  */
  41 const struct ldb_schema_attribute *dsdb_attribute_handler_override(struct ldb_context *ldb,
  42                                                                    void *private_data,
  43                                                                    const char *name)
  44 {
  45         struct dsdb_schema *schema = talloc_get_type_abort(private_data, struct dsdb_schema);
  46         const struct dsdb_attribute *a = dsdb_attribute_by_lDAPDisplayName(schema, name);
  47         if (a == NULL) {
  48                 /* this will fall back to ldb internal handling */
  49                 return NULL;
  50         }
  51         return a->ldb_schema_attribute;
  52 }
  53
  54 static int dsdb_schema_set_attributes(struct ldb_context *ldb, struct dsdb_schema *schema, bool write_attributes)
  55 {
  56         int ret = LDB_SUCCESS;
  57         struct ldb_result *res;
  58         struct ldb_result *res_idx;
  59         struct dsdb_attribute *attr;
  60         struct ldb_message *mod_msg;
  61         TALLOC_CTX *mem_ctx;
  62         struct ldb_message *msg;
  63         struct ldb_message *msg_idx;
  64
  65         /* setup our own attribute name to schema handler */
  66         ldb_schema_attribute_set_override_handler(ldb, dsdb_attribute_handler_override, schema);
  67
  68         if (!write_attributes) {
  69                 return ret;
  70         }
  71
  72         mem_ctx = talloc_new(ldb);
  73         if (!mem_ctx) {
  74                 return ldb_oom(ldb);
  75         }
  76
  77         msg = ldb_msg_new(mem_ctx);
  78         if (!msg) {
  79                 ldb_oom(ldb);
  80                 goto op_error;
  81         }
  82         msg_idx = ldb_msg_new(mem_ctx);
  83         if (!msg_idx) {
  84                 ldb_oom(ldb);
  85                 goto op_error;
  86         }
  87         msg->dn = ldb_dn_new(msg, ldb, "@ATTRIBUTES");
  88         if (!msg->dn) {
  89                 ldb_oom(ldb);
  90                 goto op_error;
  91         }
  92         msg_idx->dn = ldb_dn_new(msg_idx, ldb, "@INDEXLIST");
  93         if (!msg_idx->dn) {
  94                 ldb_oom(ldb);
  95                 goto op_error;
  96         }
  97
  98         ret = ldb_msg_add_string(msg_idx, "@IDXONE", "1");
  99         if (ret != LDB_SUCCESS) {
 100                 goto op_error;
 101         }
 102
 103
 104         ret = ldb_msg_add_string(msg_idx, "@IDXVERSION", SAMDB_INDEXING_VERSION);
 105         if (ret != LDB_SUCCESS) {
 106                 goto op_error;
 107         }
 108
 109         for (attr = schema->attributes; attr; attr = attr->next) {
 110                 const char *syntax = attr->syntax->ldb_syntax;
 111
 112                 if (!syntax) {
 113                         syntax = attr->syntax->ldap_oid;
 114                 }
 115
 116                 /*
 117                  * Write out a rough approximation of the schema
 118                  * as an @ATTRIBUTES value, for bootstrapping
 119                  */
 120                 if (strcmp(syntax, LDB_SYNTAX_INTEGER) == 0) {
 121                         ret = ldb_msg_add_string(msg, attr->lDAPDisplayName, "INTEGER");
 122                 } else if (strcmp(syntax, LDB_SYNTAX_DIRECTORY_STRING) == 0) {
 123                         ret = ldb_msg_add_string(msg, attr->lDAPDisplayName, "CASE_INSENSITIVE");
 124                 }
 125                 if (ret != LDB_SUCCESS) {
 126                         break;
 127                 }
 128
 129                 if (attr->searchFlags & SEARCH_FLAG_ATTINDEX) {
 130                         ret = ldb_msg_add_string(msg_idx, "@IDXATTR", attr->lDAPDisplayName);
 131                         if (ret != LDB_SUCCESS) {
 132                                 break;
 133                         }
 134                 }
 135         }
 136
 137         if (ret != LDB_SUCCESS) {
 138                 talloc_free(mem_ctx);
 139                 return ret;
 140         }
 141
 142         /*
 143          * Try to avoid churning the attributes too much,
 144          * we only want to do this if they have changed
 145          */
 146         ret = ldb_search(ldb, mem_ctx, &res, msg->dn, LDB_SCOPE_BASE, NULL,
 147                          NULL);
 148         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 149                 ret = ldb_add(ldb, msg);
 150         } else if (ret != LDB_SUCCESS) {
 151         } else if (res->count != 1) {
 152                 ret = ldb_add(ldb, msg);
 153         } else {
 154                 ret = LDB_SUCCESS;
 155                 /* Annoyingly added to our search results */
 156                 ldb_msg_remove_attr(res->msgs[0], "distinguishedName");
 157
 158                 ret = ldb_msg_difference(ldb, mem_ctx,
 159                                          res->msgs[0], msg, &mod_msg);
 160                 if (ret != LDB_SUCCESS) {
 161                         goto op_error;
 162                 }
 163                 if (mod_msg->num_elements > 0) {
 164                         ret = dsdb_replace(ldb, mod_msg, 0);
 165                 }
 166                 talloc_free(mod_msg);
 167         }
 168
 169         if (ret == LDB_ERR_OPERATIONS_ERROR || ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS || ret == LDB_ERR_INVALID_DN_SYNTAX) {
 170                 /* We might be on a read-only DB or LDAP */
 171                 ret = LDB_SUCCESS;
 172         }
 173         if (ret != LDB_SUCCESS) {
 174                 talloc_free(mem_ctx);
 175                 return ret;
 176         }
 177
 178         /* Now write out the indexes, as found in the schema (if they have changed) */
 179
 180         ret = ldb_search(ldb, mem_ctx, &res_idx, msg_idx->dn, LDB_SCOPE_BASE,
 181                          NULL, NULL);
 182         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 183                 ret = ldb_add(ldb, msg_idx);
 184         } else if (ret != LDB_SUCCESS) {
 185         } else if (res_idx->count != 1) {
 186                 ret = ldb_add(ldb, msg_idx);
 187         } else {
 188                 ret = LDB_SUCCESS;
 189                 /* Annoyingly added to our search results */
 190                 ldb_msg_remove_attr(res_idx->msgs[0], "distinguishedName");
 191
 192                 ret = ldb_msg_difference(ldb, mem_ctx,
 193                                          res_idx->msgs[0], msg_idx, &mod_msg);
 194                 if (ret != LDB_SUCCESS) {
 195                         goto op_error;
 196                 }
 197                 if (mod_msg->num_elements > 0) {
 198                         ret = dsdb_replace(ldb, mod_msg, 0);
 199                 }
 200                 talloc_free(mod_msg);
 201         }
 202         if (ret == LDB_ERR_OPERATIONS_ERROR || ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS || ret == LDB_ERR_INVALID_DN_SYNTAX) {
 203                 /* We might be on a read-only DB */
 204                 ret = LDB_SUCCESS;
 205         }
 206         talloc_free(mem_ctx);
 207         return ret;
 208
 209 op_error:
 210         talloc_free(mem_ctx);
 211         return ldb_operr(ldb);
 212 }
 213
 214
 215 /*
 216   create extra attribute shortcuts
 217  */
 218 static void dsdb_setup_attribute_shortcuts(struct ldb_context *ldb, struct dsdb_schema *schema)
 219 {
 220         struct dsdb_attribute *attribute;
 221
 222         /* setup fast access to one_way_link and DN format */
 223         for (attribute=schema->attributes; attribute; attribute=attribute->next) {
 224                 attribute->dn_format = dsdb_dn_oid_to_format(attribute->syntax->ldap_oid);
 225
 226                 if (attribute->dn_format == DSDB_INVALID_DN) {
 227                         attribute->one_way_link = false;
 228                         continue;
 229                 }
 230
 231                 /* these are not considered to be one way links for
 232                    the purpose of DN link fixups */
 233                 if (ldb_attr_cmp("distinguishedName", attribute->lDAPDisplayName) == 0 ||
 234                     ldb_attr_cmp("objectCategory", attribute->lDAPDisplayName) == 0) {
 235                         attribute->one_way_link = false;
 236                         continue;
 237                 }
 238
 239                 if (attribute->linkID == 0) {
 240                         attribute->one_way_link = true;
 241                         continue;
 242                 }
 243                 /* handle attributes with a linkID but no backlink */
 244                 if ((attribute->linkID & 1) == 0 &&
 245                     dsdb_attribute_by_linkID(schema, attribute->linkID + 1) == NULL) {
 246                         attribute->one_way_link = true;
 247                         continue;
 248                 }
 249                 attribute->one_way_link = false;
 250         }
 251 }
 252
 253 static int uint32_cmp(uint32_t c1, uint32_t c2)
 254 {
 255         if (c1 == c2) return 0;
 256         return c1 > c2 ? 1 : -1;
 257 }
 258
 259 static int dsdb_compare_class_by_lDAPDisplayName(struct dsdb_class **c1, struct dsdb_class **c2)
 260 {
 261         return strcasecmp((*c1)->lDAPDisplayName, (*c2)->lDAPDisplayName);
 262 }
 263 static int dsdb_compare_class_by_governsID_id(struct dsdb_class **c1, struct dsdb_class **c2)
 264 {
 265         return uint32_cmp((*c1)->governsID_id, (*c2)->governsID_id);
 266 }
 267 static int dsdb_compare_class_by_governsID_oid(struct dsdb_class **c1, struct dsdb_class **c2)
 268 {
 269         return strcasecmp((*c1)->governsID_oid, (*c2)->governsID_oid);
 270 }
 271 static int dsdb_compare_class_by_cn(struct dsdb_class **c1, struct dsdb_class **c2)
 272 {
 273         return strcasecmp((*c1)->cn, (*c2)->cn);
 274 }
 275
 276 static int dsdb_compare_attribute_by_lDAPDisplayName(struct dsdb_attribute **a1, struct dsdb_attribute **a2)
 277 {
 278         return strcasecmp((*a1)->lDAPDisplayName, (*a2)->lDAPDisplayName);
 279 }
 280 static int dsdb_compare_attribute_by_attributeID_id(struct dsdb_attribute **a1, struct dsdb_attribute **a2)
 281 {
 282         return uint32_cmp((*a1)->attributeID_id, (*a2)->attributeID_id);
 283 }
 284 static int dsdb_compare_attribute_by_msDS_IntId(struct dsdb_attribute **a1, struct dsdb_attribute **a2)
 285 {
 286         return uint32_cmp((*a1)->msDS_IntId, (*a2)->msDS_IntId);
 287 }
 288 static int dsdb_compare_attribute_by_attributeID_oid(struct dsdb_attribute **a1, struct dsdb_attribute **a2)
 289 {
 290         return strcasecmp((*a1)->attributeID_oid, (*a2)->attributeID_oid);
 291 }
 292 static int dsdb_compare_attribute_by_linkID(struct dsdb_attribute **a1, struct dsdb_attribute **a2)
 293 {
 294         return uint32_cmp((*a1)->linkID, (*a2)->linkID);
 295 }
 296
 297 /**
 298  * Clean up Classes and Attributes accessor arrays
 299  */
 300 static void dsdb_sorted_accessors_free(struct dsdb_schema *schema)
 301 {
 302         /* free classes accessors */
 303         TALLOC_FREE(schema->classes_by_lDAPDisplayName);
 304         TALLOC_FREE(schema->classes_by_governsID_id);
 305         TALLOC_FREE(schema->classes_by_governsID_oid);
 306         TALLOC_FREE(schema->classes_by_cn);
 307         /* free attribute accessors */
 308         TALLOC_FREE(schema->attributes_by_lDAPDisplayName);
 309         TALLOC_FREE(schema->attributes_by_attributeID_id);
 310         TALLOC_FREE(schema->attributes_by_msDS_IntId);
 311         TALLOC_FREE(schema->attributes_by_attributeID_oid);
 312         TALLOC_FREE(schema->attributes_by_linkID);
 313 }
 314
 315 /*
 316   create the sorted accessor arrays for the schema
 317  */
 318 int dsdb_setup_sorted_accessors(struct ldb_context *ldb,
 319                                 struct dsdb_schema *schema)
 320 {
 321         struct dsdb_class *cur;
 322         struct dsdb_attribute *a;
 323         unsigned int i;
 324         unsigned int num_int_id;
 325         int ret;
 326
 327         /* free all caches */
 328         dsdb_sorted_accessors_free(schema);
 329
 330         /* count the classes */
 331         for (i=0, cur=schema->classes; cur; i++, cur=cur->next) /* noop */ ;
 332         schema->num_classes = i;
 333
 334         /* setup classes_by_* */
 335         schema->classes_by_lDAPDisplayName = talloc_array(schema, struct dsdb_class *, i);
 336         schema->classes_by_governsID_id    = talloc_array(schema, struct dsdb_class *, i);
 337         schema->classes_by_governsID_oid   = talloc_array(schema, struct dsdb_class *, i);
 338         schema->classes_by_cn              = talloc_array(schema, struct dsdb_class *, i);
 339         if (schema->classes_by_lDAPDisplayName == NULL ||
 340             schema->classes_by_governsID_id == NULL ||
 341             schema->classes_by_governsID_oid == NULL ||
 342             schema->classes_by_cn == NULL) {
 343                 goto failed;
 344         }
 345
 346         for (i=0, cur=schema->classes; cur; i++, cur=cur->next) {
 347                 schema->classes_by_lDAPDisplayName[i] = cur;
 348                 schema->classes_by_governsID_id[i]    = cur;
 349                 schema->classes_by_governsID_oid[i]   = cur;
 350                 schema->classes_by_cn[i]              = cur;
 351         }
 352
 353         /* sort the arrays */
 354         TYPESAFE_QSORT(schema->classes_by_lDAPDisplayName, schema->num_classes, dsdb_compare_class_by_lDAPDisplayName);
 355         TYPESAFE_QSORT(schema->classes_by_governsID_id, schema->num_classes, dsdb_compare_class_by_governsID_id);
 356         TYPESAFE_QSORT(schema->classes_by_governsID_oid, schema->num_classes, dsdb_compare_class_by_governsID_oid);
 357         TYPESAFE_QSORT(schema->classes_by_cn, schema->num_classes, dsdb_compare_class_by_cn);
 358
 359         /* now build the attribute accessor arrays */
 360
 361         /* count the attributes
 362          * and attributes with msDS-IntId set */
 363         num_int_id = 0;
 364         for (i=0, a=schema->attributes; a; i++, a=a->next) {
 365                 if (a->msDS_IntId != 0) {
 366                         num_int_id++;
 367                 }
 368         }
 369         schema->num_attributes = i;
 370         schema->num_int_id_attr = num_int_id;
 371
 372         /* setup attributes_by_* */
 373         schema->attributes_by_lDAPDisplayName = talloc_array(schema, struct dsdb_attribute *, i);
 374         schema->attributes_by_attributeID_id    = talloc_array(schema, struct dsdb_attribute *, i);
 375         schema->attributes_by_msDS_IntId        = talloc_array(schema,
 376                                                                struct dsdb_attribute *, num_int_id);
 377         schema->attributes_by_attributeID_oid   = talloc_array(schema, struct dsdb_attribute *, i);
 378         schema->attributes_by_linkID              = talloc_array(schema, struct dsdb_attribute *, i);
 379         if (schema->attributes_by_lDAPDisplayName == NULL ||
 380             schema->attributes_by_attributeID_id == NULL ||
 381             schema->attributes_by_msDS_IntId == NULL ||
 382             schema->attributes_by_attributeID_oid == NULL ||
 383             schema->attributes_by_linkID == NULL) {
 384                 goto failed;
 385         }
 386
 387         num_int_id = 0;
 388         for (i=0, a=schema->attributes; a; i++, a=a->next) {
 389                 schema->attributes_by_lDAPDisplayName[i] = a;
 390                 schema->attributes_by_attributeID_id[i]    = a;
 391                 schema->attributes_by_attributeID_oid[i]   = a;
 392                 schema->attributes_by_linkID[i]          = a;
 393                 /* append attr-by-msDS-IntId values */
 394                 if (a->msDS_IntId != 0) {
 395                         schema->attributes_by_msDS_IntId[num_int_id] = a;
 396                         num_int_id++;
 397                 }
 398         }
 399         SMB_ASSERT(num_int_id == schema->num_int_id_attr);
 400
 401         /* sort the arrays */
 402         TYPESAFE_QSORT(schema->attributes_by_lDAPDisplayName, schema->num_attributes, dsdb_compare_attribute_by_lDAPDisplayName);
 403         TYPESAFE_QSORT(schema->attributes_by_attributeID_id, schema->num_attributes, dsdb_compare_attribute_by_attributeID_id);
 404         TYPESAFE_QSORT(schema->attributes_by_msDS_IntId, schema->num_int_id_attr, dsdb_compare_attribute_by_msDS_IntId);
 405         TYPESAFE_QSORT(schema->attributes_by_attributeID_oid, schema->num_attributes, dsdb_compare_attribute_by_attributeID_oid);
 406         TYPESAFE_QSORT(schema->attributes_by_linkID, schema->num_attributes, dsdb_compare_attribute_by_linkID);
 407
 408         dsdb_setup_attribute_shortcuts(ldb, schema);
 409
 410         ret = schema_fill_constructed(schema);
 411         if (ret != LDB_SUCCESS) {
 412                 dsdb_sorted_accessors_free(schema);
 413                 return ret;
 414         }
 415
 416         return LDB_SUCCESS;
 417
 418 failed:
 419         dsdb_sorted_accessors_free(schema);
 420         return ldb_oom(ldb);
 421 }
 422
 423 /**
 424  * Attach the schema to an opaque pointer on the ldb,
 425  * so ldb modules can find it
 426  */
 427 int dsdb_set_schema(struct ldb_context *ldb, struct dsdb_schema *schema)
 428 {
 429         struct dsdb_schema *old_schema;
 430         int ret;
 431
 432         ret = dsdb_setup_sorted_accessors(ldb, schema);
 433         if (ret != LDB_SUCCESS) {
 434                 return ret;
 435         }
 436
 437         old_schema = ldb_get_opaque(ldb, "dsdb_schema");
 438
 439         ret = ldb_set_opaque(ldb, "dsdb_schema", schema);
 440         if (ret != LDB_SUCCESS) {
 441                 return ret;
 442         }
 443
 444         /* Remove the reference to the schema we just overwrote - if there was
 445          * none, NULL is harmless here */
 446         if (old_schema != schema) {
 447                 talloc_unlink(ldb, old_schema);
 448                 talloc_steal(ldb, schema);
 449         }
 450
 451         ret = ldb_set_opaque(ldb, "dsdb_use_global_schema", NULL);
 452         if (ret != LDB_SUCCESS) {
 453                 return ret;
 454         }
 455
 456         /* Set the new attributes based on the new schema */
 457         ret = dsdb_schema_set_attributes(ldb, schema, true);
 458         if (ret != LDB_SUCCESS) {
 459                 return ret;
 460         }
 461
 462         return LDB_SUCCESS;
 463 }
 464
 465 /**
 466  * Global variable to hold one copy of the schema, used to avoid memory bloat
 467  */
 468 static struct dsdb_schema *global_schema;
 469
 470 /**
 471  * Make this ldb use a specified schema, already fully calculated and belonging to another ldb
 472  */
 473 int dsdb_reference_schema(struct ldb_context *ldb, struct dsdb_schema *schema,
 474                           bool write_attributes)
 475 {
 476         int ret;
 477         struct dsdb_schema *old_schema;
 478         old_schema = ldb_get_opaque(ldb, "dsdb_schema");
 479         ret = ldb_set_opaque(ldb, "dsdb_schema", schema);
 480         if (ret != LDB_SUCCESS) {
 481                 return ret;
 482         }
 483
 484         /* Remove the reference to the schema we just overwrote - if there was
 485          * none, NULL is harmless here */
 486         talloc_unlink(ldb, old_schema);
 487
 488         if (talloc_reference(ldb, schema) == NULL) {
 489                 return ldb_oom(ldb);
 490         }
 491
 492         /* Make this ldb use local schema preferably */
 493         ret = ldb_set_opaque(ldb, "dsdb_use_global_schema", NULL);
 494         if (ret != LDB_SUCCESS) {
 495                 return ret;
 496         }
 497
 498         ret = dsdb_schema_set_attributes(ldb, schema, write_attributes);
 499         if (ret != LDB_SUCCESS) {
 500                 return ret;
 501         }
 502
 503         return LDB_SUCCESS;
 504 }
 505
 506 /**
 507  * Make this ldb use the 'global' schema, setup to avoid having multiple copies in this process
 508  */
 509 int dsdb_set_global_schema(struct ldb_context *ldb)
 510 {
 511         int ret;
 512         void *use_global_schema = (void *)1;
 513         if (!global_schema) {
 514                 return LDB_SUCCESS;
 515         }
 516         ret = ldb_set_opaque(ldb, "dsdb_use_global_schema", use_global_schema);
 517         if (ret != LDB_SUCCESS) {
 518                 return ret;
 519         }
 520
 521         /* Set the new attributes based on the new schema */
 522         ret = dsdb_schema_set_attributes(ldb, global_schema, false /* Don't write attributes, it's expensive */);
 523         if (ret == LDB_SUCCESS) {
 524                 /* Keep a reference to this schema, just in case the original copy is replaced */
 525                 if (talloc_reference(ldb, global_schema) == NULL) {
 526                         return ldb_oom(ldb);
 527                 }
 528         }
 529
 530         return ret;
 531 }
 532
 533 bool dsdb_uses_global_schema(struct ldb_context *ldb)
 534 {
 535         return (ldb_get_opaque(ldb, "dsdb_use_global_schema") != NULL);
 536 }
 537
 538 /**
 539  * Find the schema object for this ldb
 540  *
 541  * If reference_ctx is not NULL, then talloc_reference onto that context
 542  */
 543
 544 struct dsdb_schema *dsdb_get_schema(struct ldb_context *ldb, TALLOC_CTX *reference_ctx)
 545 {
 546         const void *p;
 547         struct dsdb_schema *schema_out;
 548         struct dsdb_schema *schema_in;
 549         bool use_global_schema;
 550         TALLOC_CTX *tmp_ctx = talloc_new(reference_ctx);
 551         if (!tmp_ctx) {
 552                 return NULL;
 553         }
 554
 555         /* see if we have a cached copy */
 556         use_global_schema = dsdb_uses_global_schema(ldb);
 557         if (use_global_schema) {
 558                 schema_in = global_schema;
 559         } else {
 560                 p = ldb_get_opaque(ldb, "dsdb_schema");
 561
 562                 schema_in = talloc_get_type(p, struct dsdb_schema);
 563                 if (!schema_in) {
 564                         talloc_free(tmp_ctx);
 565                         return NULL;
 566                 }
 567         }
 568
 569         if (schema_in->refresh_fn && !schema_in->refresh_in_progress) {
 570                 if (!talloc_reference(tmp_ctx, schema_in)) {
 571                         /*
 572                          * ensure that the schema_in->refresh_in_progress
 573                          * remains valid for the right amount of time
 574                          */
 575                         talloc_free(tmp_ctx);
 576                         return NULL;
 577                 }
 578                 schema_in->refresh_in_progress = true;
 579                 /* This may change schema, if it needs to reload it from disk */
 580                 schema_out = schema_in->refresh_fn(schema_in->loaded_from_module,
 581                                                    schema_in,
 582                                                    use_global_schema);
 583                 schema_in->refresh_in_progress = false;
 584         } else {
 585                 schema_out = schema_in;
 586         }
 587
 588         /* This removes the extra reference above */
 589         talloc_free(tmp_ctx);
 590         if (!reference_ctx) {
 591                 return schema_out;
 592         } else {
 593                 return talloc_reference(reference_ctx, schema_out);
 594         }
 595 }
 596
 597 /**
 598  * Make the schema found on this ldb the 'global' schema
 599  */
 600
 601 void dsdb_make_schema_global(struct ldb_context *ldb, struct dsdb_schema *schema)
 602 {
 603         if (!schema) {
 604                 return;
 605         }
 606
 607         if (global_schema) {
 608                 talloc_unlink(talloc_autofree_context(), global_schema);
 609         }
 610
 611         /* we want the schema to be around permanently */
 612         talloc_reparent(ldb, talloc_autofree_context(), schema);
 613         global_schema = schema;
 614
 615         /* This calls the talloc_reference() of the global schema back onto the ldb */
 616         dsdb_set_global_schema(ldb);
 617 }
 618
 619 /**
 620  * When loading the schema from LDIF files, we don't get the extended DNs.
 621  *
 622  * We need to set these up, so that from the moment we start the provision,
 623  * the defaultObjectCategory links are set up correctly.
 624  */
 625 int dsdb_schema_fill_extended_dn(struct ldb_context *ldb, struct dsdb_schema *schema)
 626 {
 627         struct dsdb_class *cur;
 628         const struct dsdb_class *target_class;
 629         for (cur = schema->classes; cur; cur = cur->next) {
 630                 const struct ldb_val *rdn;
 631                 struct ldb_val guid;
 632                 NTSTATUS status;
 633                 struct ldb_dn *dn = ldb_dn_new(NULL, ldb, cur->defaultObjectCategory);
 634
 635                 if (!dn) {
 636                         return LDB_ERR_INVALID_DN_SYNTAX;
 637                 }
 638                 rdn = ldb_dn_get_component_val(dn, 0);
 639                 if (!rdn) {
 640                         talloc_free(dn);
 641                         return LDB_ERR_INVALID_DN_SYNTAX;
 642                 }
 643                 target_class = dsdb_class_by_cn_ldb_val(schema, rdn);
 644                 if (!target_class) {
 645                         talloc_free(dn);
 646                         return LDB_ERR_CONSTRAINT_VIOLATION;
 647                 }
 648
 649                 status = GUID_to_ndr_blob(&target_class->objectGUID, dn, &guid);
 650                 if (!NT_STATUS_IS_OK(status)) {
 651                         talloc_free(dn);
 652                         return ldb_operr(ldb);
 653                 }
 654                 ldb_dn_set_extended_component(dn, "GUID", &guid);
 655
 656                 cur->defaultObjectCategory = ldb_dn_get_extended_linearized(cur, dn, 1);
 657                 talloc_free(dn);
 658         }
 659         return LDB_SUCCESS;
 660 }
 661
 662 /**
 663  * Add an element to the schema (attribute or class) from an LDB message
 664  */
 665 WERROR dsdb_schema_set_el_from_ldb_msg(struct ldb_context *ldb, struct dsdb_schema *schema,
 666                                        struct ldb_message *msg)
 667 {
 668         if (samdb_find_attribute(ldb, msg,
 669                                  "objectclass", "attributeSchema") != NULL) {
 670                 return dsdb_set_attribute_from_ldb(ldb, schema, msg);
 671         } else if (samdb_find_attribute(ldb, msg,
 672                                  "objectclass", "classSchema") != NULL) {
 673                 return dsdb_set_class_from_ldb(schema, msg);
 674         }
 675
 676         /* Don't fail on things not classes or attributes */
 677         return WERR_OK;
 678 }
 679
 680 /**
 681  * Rather than read a schema from the LDB itself, read it from an ldif
 682  * file.  This allows schema to be loaded and used while adding the
 683  * schema itself to the directory.
 684  */
 685
 686 WERROR dsdb_set_schema_from_ldif(struct ldb_context *ldb,
 687                                  const char *pf, const char *df,
 688                                  const char *dn)
 689 {
 690         struct ldb_ldif *ldif;
 691         struct ldb_message *msg;
 692         TALLOC_CTX *mem_ctx;
 693         WERROR status;
 694         int ret;
 695         struct dsdb_schema *schema;
 696         const struct ldb_val *prefix_val;
 697         const struct ldb_val *info_val;
 698         struct ldb_val info_val_default;
 699
 700
 701         mem_ctx = talloc_new(ldb);
 702         if (!mem_ctx) {
 703                 goto nomem;
 704         }
 705
 706         schema = dsdb_new_schema(mem_ctx);
 707         if (!schema) {
 708                 goto nomem;
 709         }
 710         schema->base_dn = ldb_dn_new(schema, ldb, dn);
 711         if (!schema->base_dn) {
 712                 goto nomem;
 713         }
 714         schema->fsmo.we_are_master = true;
 715         schema->fsmo.update_allowed = true;
 716         schema->fsmo.master_dn = ldb_dn_new(schema, ldb, "@PROVISION_SCHEMA_MASTER");
 717         if (!schema->fsmo.master_dn) {
 718                 goto nomem;
 719         }
 720
 721         /*
 722          * load the prefixMap attribute from pf
 723          */
 724         ldif = ldb_ldif_read_string(ldb, &pf);
 725         if (!ldif) {
 726                 status = WERR_INVALID_PARAM;
 727                 goto failed;
 728         }
 729         talloc_steal(mem_ctx, ldif);
 730
 731         ret = ldb_msg_normalize(ldb, mem_ctx, ldif->msg, &msg);
 732         if (ret != LDB_SUCCESS) {
 733                 goto nomem;
 734         }
 735         talloc_free(ldif);
 736
 737         prefix_val = ldb_msg_find_ldb_val(msg, "prefixMap");
 738         if (!prefix_val) {
 739                 status = WERR_INVALID_PARAM;
 740                 goto failed;
 741         }
 742
 743         info_val = ldb_msg_find_ldb_val(msg, "schemaInfo");
 744         if (!info_val) {
 745                 status = dsdb_schema_info_blob_new(mem_ctx, &info_val_default);
 746                 W_ERROR_NOT_OK_GOTO(status, failed);
 747                 info_val = &info_val_default;
 748         }
 749
 750         status = dsdb_load_oid_mappings_ldb(schema, prefix_val, info_val);
 751         if (!W_ERROR_IS_OK(status)) {
 752                 DEBUG(0,("ERROR: dsdb_load_oid_mappings_ldb() failed with %s\n", win_errstr(status)));
 753                 goto failed;
 754         }
 755
 756         /* load the attribute and class definitions out of df */
 757         while ((ldif = ldb_ldif_read_string(ldb, &df))) {
 758                 talloc_steal(mem_ctx, ldif);
 759
 760                 ret = ldb_msg_normalize(ldb, ldif, ldif->msg, &msg);
 761                 if (ret != LDB_SUCCESS) {
 762                         goto nomem;
 763                 }
 764
 765                 status = dsdb_schema_set_el_from_ldb_msg(ldb, schema, msg);
 766                 talloc_free(ldif);
 767                 if (!W_ERROR_IS_OK(status)) {
 768                         goto failed;
 769                 }
 770         }
 771
 772         ret = dsdb_set_schema(ldb, schema);
 773         if (ret != LDB_SUCCESS) {
 774                 status = WERR_FOOBAR;
 775                 goto failed;
 776         }
 777
 778         ret = dsdb_schema_fill_extended_dn(ldb, schema);
 779         if (ret != LDB_SUCCESS) {
 780                 status = WERR_FOOBAR;
 781                 goto failed;
 782         }
 783
 784         goto done;
 785
 786 nomem:
 787         status = WERR_NOMEM;
 788 failed:
 789 done:
 790         talloc_free(mem_ctx);
 791         return status;
 792 }