source4/dsdb/samdb/ldb_modules/samldb.c

   1 /*
   2    SAM ldb module
   3
   4    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   5    Copyright (C) Simo Sorce  2004-2008
   6    Copyright (C) Matthias Dieter Wallnöfer 2009-2011
   7    Copyright (C) Matthieu Patou 2012
   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  *  Name: ldb
  25  *
  26  *  Component: ldb samldb module
  27  *
  28  *  Description: various internal DSDB triggers - most for SAM specific objects
  29  *
  30  *  Author: Simo Sorce
  31  */
  32
  33 #include "includes.h"
  34 #include "libcli/ldap/ldap_ndr.h"
  35 #include "ldb_module.h"
  36 #include "dsdb/samdb/samdb.h"
  37 #include "dsdb/samdb/ldb_modules/util.h"
  38 #include "dsdb/samdb/ldb_modules/ridalloc.h"
  39 #include "libcli/security/security.h"
  40 #include "librpc/gen_ndr/ndr_security.h"
  41 #include "ldb_wrap.h"
  42 #include "param/param.h"
  43 #include "libds/common/flag_mapping.h"
  44
  45 struct samldb_ctx;
  46 enum samldb_add_type {
  47         SAMLDB_TYPE_USER,
  48         SAMLDB_TYPE_GROUP,
  49         SAMLDB_TYPE_CLASS,
  50         SAMLDB_TYPE_ATTRIBUTE
  51 };
  52
  53 typedef int (*samldb_step_fn_t)(struct samldb_ctx *);
  54
  55 struct samldb_step {
  56         struct samldb_step *next;
  57         samldb_step_fn_t fn;
  58 };
  59
  60 struct samldb_ctx {
  61         struct ldb_module *module;
  62         struct ldb_request *req;
  63
  64         /* used for add operations */
  65         enum samldb_add_type type;
  66
  67         /* the resulting message */
  68         struct ldb_message *msg;
  69
  70         /* used in "samldb_find_for_defaultObjectCategory" */
  71         struct ldb_dn *dn, *res_dn;
  72
  73         /* all the async steps necessary to complete the operation */
  74         struct samldb_step *steps;
  75         struct samldb_step *curstep;
  76
  77         /* If someone set an ares to forward controls and response back to the caller */
  78         struct ldb_reply *ares;
  79 };
  80
  81 static struct samldb_ctx *samldb_ctx_init(struct ldb_module *module,
  82                                           struct ldb_request *req)
  83 {
  84         struct ldb_context *ldb;
  85         struct samldb_ctx *ac;
  86
  87         ldb = ldb_module_get_ctx(module);
  88
  89         ac = talloc_zero(req, struct samldb_ctx);
  90         if (ac == NULL) {
  91                 ldb_oom(ldb);
  92                 return NULL;
  93         }
  94
  95         ac->module = module;
  96         ac->req = req;
  97
  98         return ac;
  99 }
 100
 101 static int samldb_add_step(struct samldb_ctx *ac, samldb_step_fn_t fn)
 102 {
 103         struct samldb_step *step, *stepper;
 104
 105         step = talloc_zero(ac, struct samldb_step);
 106         if (step == NULL) {
 107                 return ldb_oom(ldb_module_get_ctx(ac->module));
 108         }
 109
 110         step->fn = fn;
 111
 112         if (ac->steps == NULL) {
 113                 ac->steps = step;
 114                 ac->curstep = step;
 115         } else {
 116                 if (ac->curstep == NULL)
 117                         return ldb_operr(ldb_module_get_ctx(ac->module));
 118                 for (stepper = ac->curstep; stepper->next != NULL;
 119                         stepper = stepper->next);
 120                 stepper->next = step;
 121         }
 122
 123         return LDB_SUCCESS;
 124 }
 125
 126 static int samldb_first_step(struct samldb_ctx *ac)
 127 {
 128         if (ac->steps == NULL) {
 129                 return ldb_operr(ldb_module_get_ctx(ac->module));
 130         }
 131
 132         ac->curstep = ac->steps;
 133         return ac->curstep->fn(ac);
 134 }
 135
 136 static int samldb_next_step(struct samldb_ctx *ac)
 137 {
 138         if (ac->curstep->next) {
 139                 ac->curstep = ac->curstep->next;
 140                 return ac->curstep->fn(ac);
 141         }
 142
 143         /* We exit the samldb module here. If someone set an "ares" to forward
 144          * controls and response back to the caller, use them. */
 145         if (ac->ares) {
 146                 return ldb_module_done(ac->req, ac->ares->controls,
 147                                        ac->ares->response, LDB_SUCCESS);
 148         } else {
 149                 return ldb_module_done(ac->req, NULL, NULL, LDB_SUCCESS);
 150         }
 151 }
 152
 153
 154 /* sAMAccountName handling */
 155
 156 static int samldb_generate_sAMAccountName(struct ldb_context *ldb,
 157                                           struct ldb_message *msg)
 158 {
 159         char *name;
 160
 161         /* Format: $000000-000000000000 */
 162
 163         name = talloc_asprintf(msg, "$%.6X-%.6X%.6X",
 164                                 (unsigned int)generate_random(),
 165                                 (unsigned int)generate_random(),
 166                                 (unsigned int)generate_random());
 167         if (name == NULL) {
 168                 return ldb_oom(ldb);
 169         }
 170         return ldb_msg_add_steal_string(msg, "sAMAccountName", name);
 171 }
 172
 173 static int samldb_check_sAMAccountName(struct samldb_ctx *ac)
 174 {
 175         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 176         const char *name;
 177         int ret;
 178         struct ldb_result *res;
 179         const char * const noattrs[] = { NULL };
 180
 181         if (ldb_msg_find_element(ac->msg, "sAMAccountName") == NULL) {
 182                 ret = samldb_generate_sAMAccountName(ldb, ac->msg);
 183                 if (ret != LDB_SUCCESS) {
 184                         return ret;
 185                 }
 186         }
 187
 188         name = ldb_msg_find_attr_as_string(ac->msg, "sAMAccountName", NULL);
 189         if (name == NULL) {
 190                 /* The "sAMAccountName" cannot be nothing */
 191                 ldb_set_errstring(ldb,
 192                                   "samldb: Empty account names aren't allowed!");
 193                 return LDB_ERR_CONSTRAINT_VIOLATION;
 194         }
 195
 196         ret = dsdb_module_search(ac->module, ac, &res,
 197                                  ldb_get_default_basedn(ldb), LDB_SCOPE_SUBTREE, noattrs,
 198                                  DSDB_FLAG_NEXT_MODULE,
 199                                  ac->req,
 200                                  "(sAMAccountName=%s)",
 201                                  ldb_binary_encode_string(ac, name));
 202         if (ret != LDB_SUCCESS) {
 203                 return ret;
 204         }
 205         if (res->count != 0) {
 206                 ldb_asprintf_errstring(ldb,
 207                                        "samldb: Account name (sAMAccountName) '%s' already in use!",
 208                                        name);
 209                 talloc_free(res);
 210                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
 211         }
 212         talloc_free(res);
 213
 214         return samldb_next_step(ac);
 215 }
 216
 217
 218 static bool samldb_msg_add_sid(struct ldb_message *msg,
 219                                 const char *name,
 220                                 const struct dom_sid *sid)
 221 {
 222         struct ldb_val v;
 223         enum ndr_err_code ndr_err;
 224
 225         ndr_err = ndr_push_struct_blob(&v, msg, sid,
 226                                        (ndr_push_flags_fn_t)ndr_push_dom_sid);
 227         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 228                 return false;
 229         }
 230         return (ldb_msg_add_value(msg, name, &v, NULL) == 0);
 231 }
 232
 233
 234 /* allocate a SID using our RID Set */
 235 static int samldb_allocate_sid(struct samldb_ctx *ac)
 236 {
 237         uint32_t rid;
 238         struct dom_sid *sid;
 239         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 240         int ret;
 241
 242         ret = ridalloc_allocate_rid(ac->module, &rid, ac->req);
 243         if (ret != LDB_SUCCESS) {
 244                 return ret;
 245         }
 246
 247         sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), rid);
 248         if (sid == NULL) {
 249                 return ldb_module_oom(ac->module);
 250         }
 251
 252         if ( ! samldb_msg_add_sid(ac->msg, "objectSid", sid)) {
 253                 return ldb_operr(ldb);
 254         }
 255
 256         return samldb_next_step(ac);
 257 }
 258
 259 /*
 260   see if a krbtgt_number is available
 261  */
 262 static bool samldb_krbtgtnumber_available(struct samldb_ctx *ac,
 263                                           uint32_t krbtgt_number)
 264 {
 265         TALLOC_CTX *tmp_ctx = talloc_new(ac);
 266         struct ldb_result *res;
 267         const char * const no_attrs[] = { NULL };
 268         int ret;
 269
 270         ret = dsdb_module_search(ac->module, tmp_ctx, &res,
 271                                  ldb_get_default_basedn(ldb_module_get_ctx(ac->module)),
 272                                  LDB_SCOPE_SUBTREE, no_attrs,
 273                                  DSDB_FLAG_NEXT_MODULE,
 274                                  ac->req,
 275                                  "(msDC-SecondaryKrbTgtNumber=%u)",
 276                                  krbtgt_number);
 277         if (ret == LDB_SUCCESS && res->count == 0) {
 278                 talloc_free(tmp_ctx);
 279                 return true;
 280         }
 281         talloc_free(tmp_ctx);
 282         return false;
 283 }
 284
 285 /* special handling for add in RODC join */
 286 static int samldb_rodc_add(struct samldb_ctx *ac)
 287 {
 288         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 289         uint32_t krbtgt_number, i_start, i;
 290         int ret;
 291         char *newpass;
 292         struct ldb_val newpass_utf16;
 293
 294         /* find a unused msDC-SecondaryKrbTgtNumber */
 295         i_start = generate_random() & 0xFFFF;
 296         if (i_start == 0) {
 297                 i_start = 1;
 298         }
 299
 300         for (i=i_start; i<=0xFFFF; i++) {
 301                 if (samldb_krbtgtnumber_available(ac, i)) {
 302                         krbtgt_number = i;
 303                         goto found;
 304                 }
 305         }
 306         for (i=1; i<i_start; i++) {
 307                 if (samldb_krbtgtnumber_available(ac, i)) {
 308                         krbtgt_number = i;
 309                         goto found;
 310                 }
 311         }
 312
 313         ldb_asprintf_errstring(ldb,
 314                                "%08X: Unable to find available msDS-SecondaryKrbTgtNumber",
 315                                W_ERROR_V(WERR_NO_SYSTEM_RESOURCES));
 316         return LDB_ERR_OTHER;
 317
 318 found:
 319         ret = ldb_msg_add_empty(ac->msg, "msDS-SecondaryKrbTgtNumber",
 320                                 LDB_FLAG_INTERNAL_DISABLE_VALIDATION, NULL);
 321         if (ret != LDB_SUCCESS) {
 322                 return ldb_operr(ldb);
 323         }
 324
 325         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
 326                                  "msDS-SecondaryKrbTgtNumber", krbtgt_number);
 327         if (ret != LDB_SUCCESS) {
 328                 return ldb_operr(ldb);
 329         }
 330
 331         ret = ldb_msg_add_fmt(ac->msg, "sAMAccountName", "krbtgt_%u",
 332                               krbtgt_number);
 333         if (ret != LDB_SUCCESS) {
 334                 return ldb_operr(ldb);
 335         }
 336
 337         newpass = generate_random_password(ac->msg, 128, 255);
 338         if (newpass == NULL) {
 339                 return ldb_operr(ldb);
 340         }
 341
 342         if (!convert_string_talloc(ac,
 343                                    CH_UNIX, CH_UTF16,
 344                                    newpass, strlen(newpass),
 345                                    (void *)&newpass_utf16.data,
 346                                    &newpass_utf16.length)) {
 347                 ldb_asprintf_errstring(ldb,
 348                                        "samldb_rodc_add: "
 349                                        "failed to generate UTF16 password from random password");
 350                 return LDB_ERR_OPERATIONS_ERROR;
 351         }
 352         ret = ldb_msg_add_steal_value(ac->msg, "clearTextPassword", &newpass_utf16);
 353         if (ret != LDB_SUCCESS) {
 354                 return ldb_operr(ldb);
 355         }
 356
 357         return samldb_next_step(ac);
 358 }
 359
 360 static int samldb_find_for_defaultObjectCategory(struct samldb_ctx *ac)
 361 {
 362         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 363         struct ldb_result *res;
 364         const char * const no_attrs[] = { NULL };
 365         int ret;
 366
 367         ac->res_dn = NULL;
 368
 369         ret = dsdb_module_search(ac->module, ac, &res,
 370                                  ac->dn, LDB_SCOPE_BASE, no_attrs,
 371                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT
 372                                  | DSDB_FLAG_NEXT_MODULE,
 373                                  ac->req,
 374                                  "(objectClass=classSchema)");
 375         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 376                 /* Don't be pricky when the DN doesn't exist if we have the */
 377                 /* RELAX control specified */
 378                 if (ldb_request_get_control(ac->req,
 379                                             LDB_CONTROL_RELAX_OID) == NULL) {
 380                         ldb_set_errstring(ldb,
 381                                           "samldb_find_defaultObjectCategory: "
 382                                           "Invalid DN for 'defaultObjectCategory'!");
 383                         return LDB_ERR_CONSTRAINT_VIOLATION;
 384                 }
 385         }
 386         if ((ret != LDB_ERR_NO_SUCH_OBJECT) && (ret != LDB_SUCCESS)) {
 387                 return ret;
 388         }
 389
 390         if (ret == LDB_SUCCESS) {
 391                 /* ensure the defaultObjectCategory has a full GUID */
 392                 struct ldb_message *m;
 393                 m = ldb_msg_new(ac->msg);
 394                 if (m == NULL) {
 395                         return ldb_oom(ldb);
 396                 }
 397                 m->dn = ac->msg->dn;
 398                 if (ldb_msg_add_string(m, "defaultObjectCategory",
 399                                        ldb_dn_get_extended_linearized(m, res->msgs[0]->dn, 1)) !=
 400                     LDB_SUCCESS) {
 401                         return ldb_oom(ldb);
 402                 }
 403                 m->elements[0].flags = LDB_FLAG_MOD_REPLACE;
 404
 405                 ret = dsdb_module_modify(ac->module, m,
 406                                          DSDB_FLAG_NEXT_MODULE,
 407                                          ac->req);
 408                 if (ret != LDB_SUCCESS) {
 409                         return ret;
 410                 }
 411         }
 412
 413
 414         ac->res_dn = ac->dn;
 415
 416         return samldb_next_step(ac);
 417 }
 418
 419 /**
 420  * msDS-IntId attributeSchema attribute handling
 421  * during LDB_ADD request processing
 422  */
 423 static int samldb_add_handle_msDS_IntId(struct samldb_ctx *ac)
 424 {
 425         int ret;
 426         bool id_exists;
 427         uint32_t msds_intid;
 428         int32_t system_flags;
 429         struct ldb_context *ldb;
 430         struct ldb_result *ldb_res;
 431         struct ldb_dn *schema_dn;
 432         struct samldb_msds_intid_persistant *msds_intid_struct;
 433         struct dsdb_schema *schema;
 434
 435         ldb = ldb_module_get_ctx(ac->module);
 436         schema_dn = ldb_get_schema_basedn(ldb);
 437
 438         /* replicated update should always go through */
 439         if (ldb_request_get_control(ac->req,
 440                                     DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
 441                 return LDB_SUCCESS;
 442         }
 443
 444         /* msDS-IntId is handled by system and should never be
 445          * passed by clients */
 446         if (ldb_msg_find_element(ac->msg, "msDS-IntId")) {
 447                 return LDB_ERR_UNWILLING_TO_PERFORM;
 448         }
 449
 450         /* do not generate msDS-IntId if Relax control is passed */
 451         if (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
 452                 return LDB_SUCCESS;
 453         }
 454
 455         /* check Functional Level */
 456         if (dsdb_functional_level(ldb) < DS_DOMAIN_FUNCTION_2003) {
 457                 return LDB_SUCCESS;
 458         }
 459
 460         /* check systemFlags for SCHEMA_BASE_OBJECT flag */
 461         system_flags = ldb_msg_find_attr_as_int(ac->msg, "systemFlags", 0);
 462         if (system_flags & SYSTEM_FLAG_SCHEMA_BASE_OBJECT) {
 463                 return LDB_SUCCESS;
 464         }
 465         schema = dsdb_get_schema(ldb, NULL);
 466         if (!schema) {
 467                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 468                               "samldb_schema_info_update: no dsdb_schema loaded");
 469                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 470                 return ldb_operr(ldb);
 471         }
 472
 473         msds_intid_struct = (struct samldb_msds_intid_persistant*) ldb_get_opaque(ldb, SAMLDB_MSDS_INTID_OPAQUE);
 474         if (!msds_intid_struct) {
 475                 msds_intid_struct = talloc(ldb, struct samldb_msds_intid_persistant);
 476                 /* Generate new value for msDs-IntId
 477                 * Value should be in 0x80000000..0xBFFFFFFF range */
 478                 msds_intid = generate_random() % 0X3FFFFFFF;
 479                 msds_intid += 0x80000000;
 480                 msds_intid_struct->msds_intid = msds_intid;
 481                 msds_intid_struct->usn = schema->loaded_usn;
 482                 DEBUG(2, ("No samldb_msds_intid_persistant struct, allocating a new one\n"));
 483         } else {
 484                 msds_intid = msds_intid_struct->msds_intid;
 485         }
 486
 487         /* probe id values until unique one is found */
 488         do {
 489                 uint64_t current_usn;
 490                 msds_intid++;
 491                 if (msds_intid > 0xBFFFFFFF) {
 492                         msds_intid = 0x80000001;
 493                 }
 494                 /*
 495                  * Alternative strategy to a costly (even indexed search) to the
 496                  * database.
 497                  * We search in the schema if we have already this intid (using dsdb_attribute_by_attributeID_id because
 498                  * in the range 0x80000000 0xBFFFFFFFF, attributeID is a DSDB_ATTID_TYPE_INTID).
 499                  * If so generate another random value.
 500                  * If not check if the highest USN in the database for the schema partition is the
 501                  * one that we know.
 502                  * If so it means that's only this ldb context that is touching the schema in the database.
 503                  * If not it means that's someone else has modified the database while we are doing our changes too
 504                  * (this case should be very bery rare) in order to be sure do the search in the database.
 505                  */
 506                 if (dsdb_attribute_by_attributeID_id(schema, msds_intid)) {
 507                         msds_intid = generate_random() % 0X3FFFFFFF;
 508                         msds_intid += 0x80000000;
 509                         continue;
 510                 }
 511
 512                 ret = dsdb_module_load_partition_usn(ac->module, schema->base_dn, &current_usn, NULL, NULL);
 513                 if (ret != LDB_SUCCESS) {
 514                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 515                                       __location__": Searching for schema USN failed: %s\n",
 516                                       ldb_errstring(ldb));
 517                         return ldb_operr(ldb);
 518                 }
 519
 520                 /* current_usn can be lesser than msds_intid_struct-> if there is
 521                  * uncommited changes.
 522                  */
 523                 if (current_usn > msds_intid_struct->usn) {
 524                         /* oups something has changed, someone/something
 525                          * else is modifying or has modified the schema
 526                          * we'd better check this intid is the database directly
 527                          */
 528
 529                         DEBUG(2, ("Schema has changed, searching the database for the unicity of %d\n",
 530                                         msds_intid));
 531
 532                         ret = dsdb_module_search(ac->module, ac,
 533                                                 &ldb_res,
 534                                                 schema_dn, LDB_SCOPE_ONELEVEL, NULL,
 535                                                 DSDB_FLAG_NEXT_MODULE,
 536                                                 ac->req,
 537                                                 "(msDS-IntId=%d)", msds_intid);
 538                         if (ret != LDB_SUCCESS) {
 539                                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 540                                         __location__": Searching for msDS-IntId=%d failed - %s\n",
 541                                         msds_intid,
 542                                         ldb_errstring(ldb));
 543                                 return ldb_operr(ldb);
 544                         }
 545                         id_exists = (ldb_res->count > 0);
 546                         talloc_free(ldb_res);
 547                 } else {
 548                         id_exists = 0;
 549                 }
 550
 551         } while(id_exists);
 552         msds_intid_struct->msds_intid = msds_intid;
 553         ldb_set_opaque(ldb, SAMLDB_MSDS_INTID_OPAQUE, msds_intid_struct);
 554
 555         return samdb_msg_add_int(ldb, ac->msg, ac->msg, "msDS-IntId",
 556                                  msds_intid);
 557 }
 558
 559
 560 /*
 561  * samldb_add_entry (async)
 562  */
 563
 564 static int samldb_add_entry_callback(struct ldb_request *req,
 565                                         struct ldb_reply *ares)
 566 {
 567         struct ldb_context *ldb;
 568         struct samldb_ctx *ac;
 569         int ret;
 570
 571         ac = talloc_get_type(req->context, struct samldb_ctx);
 572         ldb = ldb_module_get_ctx(ac->module);
 573
 574         if (!ares) {
 575                 return ldb_module_done(ac->req, NULL, NULL,
 576                                         LDB_ERR_OPERATIONS_ERROR);
 577         }
 578
 579         if (ares->type == LDB_REPLY_REFERRAL) {
 580                 return ldb_module_send_referral(ac->req, ares->referral);
 581         }
 582
 583         if (ares->error != LDB_SUCCESS) {
 584                 return ldb_module_done(ac->req, ares->controls,
 585                                         ares->response, ares->error);
 586         }
 587         if (ares->type != LDB_REPLY_DONE) {
 588                 ldb_asprintf_errstring(ldb, "Invalid LDB reply type %d", ares->type);
 589                 return ldb_module_done(ac->req, NULL, NULL,
 590                                         LDB_ERR_OPERATIONS_ERROR);
 591         }
 592
 593         /* The caller may wish to get controls back from the add */
 594         ac->ares = talloc_steal(ac, ares);
 595
 596         ret = samldb_next_step(ac);
 597         if (ret != LDB_SUCCESS) {
 598                 return ldb_module_done(ac->req, NULL, NULL, ret);
 599         }
 600         return ret;
 601 }
 602
 603 static int samldb_add_entry(struct samldb_ctx *ac)
 604 {
 605         struct ldb_context *ldb;
 606         struct ldb_request *req;
 607         int ret;
 608
 609         ldb = ldb_module_get_ctx(ac->module);
 610
 611         ret = ldb_build_add_req(&req, ldb, ac,
 612                                 ac->msg,
 613                                 ac->req->controls,
 614                                 ac, samldb_add_entry_callback,
 615                                 ac->req);
 616         LDB_REQ_SET_LOCATION(req);
 617         if (ret != LDB_SUCCESS) {
 618                 return ret;
 619         }
 620
 621         return ldb_next_request(ac->module, req);
 622 }
 623
 624 /*
 625  * return true if msg carries an attributeSchema that is intended to be RODC
 626  * filtered but is also a system-critical attribute.
 627  */
 628 static bool check_rodc_critical_attribute(struct ldb_message *msg)
 629 {
 630         uint32_t schemaFlagsEx, searchFlags, rodc_filtered_flags;
 631
 632         schemaFlagsEx = ldb_msg_find_attr_as_uint(msg, "schemaFlagsEx", 0);
 633         searchFlags = ldb_msg_find_attr_as_uint(msg, "searchFlags", 0);
 634         rodc_filtered_flags = (SEARCH_FLAG_RODC_ATTRIBUTE
 635                               | SEARCH_FLAG_CONFIDENTIAL);
 636
 637         if ((schemaFlagsEx & SCHEMA_FLAG_ATTR_IS_CRITICAL) &&
 638                 ((searchFlags & rodc_filtered_flags) == rodc_filtered_flags)) {
 639                 return true;
 640         } else {
 641                 return false;
 642         }
 643 }
 644
 645
 646 static int samldb_fill_object(struct samldb_ctx *ac)
 647 {
 648         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 649         int ret;
 650
 651         /* Add information for the different account types */
 652         switch(ac->type) {
 653         case SAMLDB_TYPE_USER: {
 654                 struct ldb_control *rodc_control = ldb_request_get_control(ac->req,
 655                                                                            LDB_CONTROL_RODC_DCPROMO_OID);
 656                 if (rodc_control != NULL) {
 657                         /* see [MS-ADTS] 3.1.1.3.4.1.23 LDAP_SERVER_RODC_DCPROMO_OID */
 658                         rodc_control->critical = false;
 659                         ret = samldb_add_step(ac, samldb_rodc_add);
 660                         if (ret != LDB_SUCCESS) return ret;
 661                 }
 662
 663                 /* check if we have a valid sAMAccountName */
 664                 ret = samldb_add_step(ac, samldb_check_sAMAccountName);
 665                 if (ret != LDB_SUCCESS) return ret;
 666
 667                 ret = samldb_add_step(ac, samldb_add_entry);
 668                 if (ret != LDB_SUCCESS) return ret;
 669                 break;
 670         }
 671
 672         case SAMLDB_TYPE_GROUP: {
 673                 /* check if we have a valid sAMAccountName */
 674                 ret = samldb_add_step(ac, samldb_check_sAMAccountName);
 675                 if (ret != LDB_SUCCESS) return ret;
 676
 677                 ret = samldb_add_step(ac, samldb_add_entry);
 678                 if (ret != LDB_SUCCESS) return ret;
 679                 break;
 680         }
 681
 682         case SAMLDB_TYPE_CLASS: {
 683                 const struct ldb_val *rdn_value, *def_obj_cat_val;
 684                 unsigned int v = ldb_msg_find_attr_as_uint(ac->msg, "objectClassCategory", -2);
 685
 686                 /* As discussed with Microsoft through dochelp in April 2012 this is the behavior of windows*/
 687                 if (!ldb_msg_find_element(ac->msg, "subClassOf")) {
 688                         ret = ldb_msg_add_string(ac->msg, "subClassOf", "top");
 689                         if (ret != LDB_SUCCESS) return ret;
 690                 }
 691
 692                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 693                                                   "rdnAttId", "cn");
 694                 if (ret != LDB_SUCCESS) return ret;
 695
 696                 /* do not allow to mark an attributeSchema as RODC filtered if it
 697                  * is system-critical */
 698                 if (check_rodc_critical_attribute(ac->msg)) {
 699                         ldb_asprintf_errstring(ldb, "Refusing schema add of %s - cannot combine critical class with RODC filtering",
 700                                                ldb_dn_get_linearized(ac->msg->dn));
 701                         return LDB_ERR_UNWILLING_TO_PERFORM;
 702                 }
 703
 704                 rdn_value = ldb_dn_get_rdn_val(ac->msg->dn);
 705                 if (rdn_value == NULL) {
 706                         return ldb_operr(ldb);
 707                 }
 708                 if (!ldb_msg_find_element(ac->msg, "lDAPDisplayName")) {
 709                         /* the RDN has prefix "CN" */
 710                         ret = ldb_msg_add_string(ac->msg, "lDAPDisplayName",
 711                                 samdb_cn_to_lDAPDisplayName(ac->msg,
 712                                                             (const char *) rdn_value->data));
 713                         if (ret != LDB_SUCCESS) {
 714                                 ldb_oom(ldb);
 715                                 return ret;
 716                         }
 717                 }
 718
 719                 if (!ldb_msg_find_element(ac->msg, "schemaIDGUID")) {
 720                         struct GUID guid;
 721                         /* a new GUID */
 722                         guid = GUID_random();
 723                         ret = dsdb_msg_add_guid(ac->msg, &guid, "schemaIDGUID");
 724                         if (ret != LDB_SUCCESS) {
 725                                 ldb_oom(ldb);
 726                                 return ret;
 727                         }
 728                 }
 729
 730                 def_obj_cat_val = ldb_msg_find_ldb_val(ac->msg,
 731                                                        "defaultObjectCategory");
 732                 if (def_obj_cat_val != NULL) {
 733                         /* "defaultObjectCategory" has been set by the caller.
 734                          * Do some checks for consistency.
 735                          * NOTE: The real constraint check (that
 736                          * 'defaultObjectCategory' is the DN of the new
 737                          * objectclass or any parent of it) is still incomplete.
 738                          * For now we say that 'defaultObjectCategory' is valid
 739                          * if it exists and it is of objectclass "classSchema".
 740                          */
 741                         ac->dn = ldb_dn_from_ldb_val(ac, ldb, def_obj_cat_val);
 742                         if (ac->dn == NULL) {
 743                                 ldb_set_errstring(ldb,
 744                                                   "Invalid DN for 'defaultObjectCategory'!");
 745                                 return LDB_ERR_CONSTRAINT_VIOLATION;
 746                         }
 747                 } else {
 748                         /* "defaultObjectCategory" has not been set by the
 749                          * caller. Use the entry DN for it. */
 750                         ac->dn = ac->msg->dn;
 751
 752                         ret = ldb_msg_add_string(ac->msg, "defaultObjectCategory",
 753                                                  ldb_dn_alloc_linearized(ac->msg, ac->dn));
 754                         if (ret != LDB_SUCCESS) {
 755                                 ldb_oom(ldb);
 756                                 return ret;
 757                         }
 758                 }
 759
 760                 ret = samldb_add_step(ac, samldb_add_entry);
 761                 if (ret != LDB_SUCCESS) return ret;
 762
 763                 /* Now perform the checks for the 'defaultObjectCategory'. The
 764                  * lookup DN was already saved in "ac->dn" */
 765                 ret = samldb_add_step(ac, samldb_find_for_defaultObjectCategory);
 766                 if (ret != LDB_SUCCESS) return ret;
 767
 768                 /* -2 is not a valid objectClassCategory so it means the attribute wasn't present */
 769                 if (v == -2) {
 770                         /* Windows 2003 does this*/
 771                         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "objectClassCategory", 0);
 772                         if (ret != LDB_SUCCESS) {
 773                                 return ret;
 774                         }
 775                 }
 776                 break;
 777         }
 778
 779         case SAMLDB_TYPE_ATTRIBUTE: {
 780                 const struct ldb_val *rdn_value;
 781                 struct ldb_message_element *el;
 782                 rdn_value = ldb_dn_get_rdn_val(ac->msg->dn);
 783                 if (rdn_value == NULL) {
 784                         return ldb_operr(ldb);
 785                 }
 786                 if (!ldb_msg_find_element(ac->msg, "lDAPDisplayName")) {
 787                         /* the RDN has prefix "CN" */
 788                         ret = ldb_msg_add_string(ac->msg, "lDAPDisplayName",
 789                                 samdb_cn_to_lDAPDisplayName(ac->msg,
 790                                                             (const char *) rdn_value->data));
 791                         if (ret != LDB_SUCCESS) {
 792                                 ldb_oom(ldb);
 793                                 return ret;
 794                         }
 795                 }
 796
 797                 /* do not allow to mark an attributeSchema as RODC filtered if it
 798                  * is system-critical */
 799                 if (check_rodc_critical_attribute(ac->msg)) {
 800                         ldb_asprintf_errstring(ldb,
 801                                                "samldb: refusing schema add of %s - cannot combine critical attribute with RODC filtering",
 802                                                ldb_dn_get_linearized(ac->msg->dn));
 803                         return LDB_ERR_UNWILLING_TO_PERFORM;
 804                 }
 805
 806                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 807                                                   "isSingleValued", "FALSE");
 808                 if (ret != LDB_SUCCESS) return ret;
 809
 810                 if (!ldb_msg_find_element(ac->msg, "schemaIDGUID")) {
 811                         struct GUID guid;
 812                         /* a new GUID */
 813                         guid = GUID_random();
 814                         ret = dsdb_msg_add_guid(ac->msg, &guid, "schemaIDGUID");
 815                         if (ret != LDB_SUCCESS) {
 816                                 ldb_oom(ldb);
 817                                 return ret;
 818                         }
 819                 }
 820
 821                 el = ldb_msg_find_element(ac->msg, "attributeSyntax");
 822                 if (el) {
 823                         /*
 824                          * No need to scream if there isn't as we have code later on
 825                          * that will take care of it.
 826                          */
 827                         const struct dsdb_syntax *syntax = find_syntax_map_by_ad_oid((const char *)el->values[0].data);
 828                         if (!syntax) {
 829                                 DEBUG(9, ("Can't find dsdb_syntax object for attributeSyntax %s\n",
 830                                                 (const char *)el->values[0].data));
 831                         } else {
 832                                 unsigned int v = ldb_msg_find_attr_as_uint(ac->msg, "oMSyntax", 0);
 833                                 const struct ldb_val *val = ldb_msg_find_ldb_val(ac->msg, "oMObjectClass");
 834
 835                                 if (v == 0) {
 836                                         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "oMSyntax", syntax->oMSyntax);
 837                                         if (ret != LDB_SUCCESS) {
 838                                                 return ret;
 839                                         }
 840                                 }
 841                                 if (!val) {
 842                                         struct ldb_val val2 = ldb_val_dup(ldb, &syntax->oMObjectClass);
 843                                         if (val2.length > 0) {
 844                                                 ret = ldb_msg_add_value(ac->msg, "oMObjectClass", &val2, NULL);
 845                                                 if (ret != LDB_SUCCESS) {
 846                                                         return ret;
 847                                                 }
 848                                         }
 849                                 }
 850                         }
 851                 }
 852
 853                 /* handle msDS-IntID attribute */
 854                 ret = samldb_add_handle_msDS_IntId(ac);
 855                 if (ret != LDB_SUCCESS) return ret;
 856
 857                 ret = samldb_add_step(ac, samldb_add_entry);
 858                 if (ret != LDB_SUCCESS) return ret;
 859                 break;
 860         }
 861
 862         default:
 863                 ldb_asprintf_errstring(ldb, "Invalid entry type!");
 864                 return LDB_ERR_OPERATIONS_ERROR;
 865                 break;
 866         }
 867
 868         return samldb_first_step(ac);
 869 }
 870
 871 static int samldb_fill_foreignSecurityPrincipal_object(struct samldb_ctx *ac)
 872 {
 873         struct ldb_context *ldb;
 874         const struct ldb_val *rdn_value;
 875         struct dom_sid *sid;
 876         int ret;
 877
 878         ldb = ldb_module_get_ctx(ac->module);
 879
 880         sid = samdb_result_dom_sid(ac->msg, ac->msg, "objectSid");
 881         if (sid == NULL) {
 882                 rdn_value = ldb_dn_get_rdn_val(ac->msg->dn);
 883                 if (rdn_value == NULL) {
 884                         return ldb_operr(ldb);
 885                 }
 886                 sid = dom_sid_parse_talloc(ac->msg,
 887                                            (const char *)rdn_value->data);
 888                 if (sid == NULL) {
 889                         ldb_set_errstring(ldb,
 890                                           "samldb: No valid SID found in ForeignSecurityPrincipal CN!");
 891                         return LDB_ERR_CONSTRAINT_VIOLATION;
 892                 }
 893                 if (! samldb_msg_add_sid(ac->msg, "objectSid", sid)) {
 894                         return ldb_operr(ldb);
 895                 }
 896         }
 897
 898         /* finally proceed with adding the entry */
 899         ret = samldb_add_step(ac, samldb_add_entry);
 900         if (ret != LDB_SUCCESS) return ret;
 901
 902         return samldb_first_step(ac);
 903 }
 904
 905 static int samldb_schema_info_update(struct samldb_ctx *ac)
 906 {
 907         int ret;
 908         struct ldb_context *ldb;
 909         struct dsdb_schema *schema;
 910
 911         /* replicated update should always go through */
 912         if (ldb_request_get_control(ac->req,
 913                                     DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
 914                 return LDB_SUCCESS;
 915         }
 916
 917         /* do not update schemaInfo during provisioning */
 918         if (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
 919                 return LDB_SUCCESS;
 920         }
 921
 922         ldb = ldb_module_get_ctx(ac->module);
 923         schema = dsdb_get_schema(ldb, NULL);
 924         if (!schema) {
 925                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 926                               "samldb_schema_info_update: no dsdb_schema loaded");
 927                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 928                 return ldb_operr(ldb);
 929         }
 930
 931         ret = dsdb_module_schema_info_update(ac->module, schema,
 932                                              DSDB_FLAG_NEXT_MODULE|
 933                                              DSDB_FLAG_AS_SYSTEM,
 934                                              ac->req);
 935         if (ret != LDB_SUCCESS) {
 936                 ldb_asprintf_errstring(ldb,
 937                                        "samldb_schema_info_update: dsdb_module_schema_info_update failed with %s",
 938                                        ldb_errstring(ldb));
 939                 return ret;
 940         }
 941
 942         return LDB_SUCCESS;
 943 }
 944
 945 static int samldb_prim_group_tester(struct samldb_ctx *ac, uint32_t rid);
 946
 947 /*
 948  * "Objectclass" trigger (MS-SAMR 3.1.1.8.1)
 949  *
 950  * Has to be invoked on "add" and "modify" operations on "user", "computer" and
 951  * "group" objects.
 952  * ac->msg contains the "add"/"modify" message
 953  * ac->type contains the object type (main objectclass)
 954  */
 955 static int samldb_objectclass_trigger(struct samldb_ctx *ac)
 956 {
 957         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 958         void *skip_allocate_sids = ldb_get_opaque(ldb,
 959                                                   "skip_allocate_sids");
 960         struct ldb_message_element *el, *el2;
 961         struct dom_sid *sid;
 962         int ret;
 963
 964         /* make sure that "sAMAccountType" is not specified */
 965         el = ldb_msg_find_element(ac->msg, "sAMAccountType");
 966         if (el != NULL) {
 967                 ldb_set_errstring(ldb,
 968                                   "samldb: sAMAccountType must not be specified!");
 969                 return LDB_ERR_UNWILLING_TO_PERFORM;
 970         }
 971
 972         /* Step 1: objectSid assignment */
 973
 974         /* Don't allow the objectSid to be changed. But beside the RELAX
 975          * control we have also to guarantee that it can always be set with
 976          * SYSTEM permissions. This is needed for the "samba3sam" backend. */
 977         sid = samdb_result_dom_sid(ac, ac->msg, "objectSid");
 978         if ((sid != NULL) && (!dsdb_module_am_system(ac->module)) &&
 979             (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID) == NULL)) {
 980                 ldb_set_errstring(ldb,
 981                                   "samldb: objectSid must not be specified!");
 982                 return LDB_ERR_UNWILLING_TO_PERFORM;
 983         }
 984
 985         /* but generate a new SID when we do have an add operations */
 986         if ((sid == NULL) && (ac->req->operation == LDB_ADD) && !skip_allocate_sids) {
 987                 ret = samldb_add_step(ac, samldb_allocate_sid);
 988                 if (ret != LDB_SUCCESS) return ret;
 989         }
 990
 991         switch(ac->type) {
 992         case SAMLDB_TYPE_USER: {
 993                 bool uac_generated = false, uac_add_flags = false;
 994
 995                 /* Step 1.2: Default values */
 996                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 997                         "accountExpires", "9223372036854775807");
 998                 if (ret != LDB_SUCCESS) return ret;
 999                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1000                         "badPasswordTime", "0");
1001                 if (ret != LDB_SUCCESS) return ret;
1002                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1003                         "badPwdCount", "0");
1004                 if (ret != LDB_SUCCESS) return ret;
1005                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1006                         "codePage", "0");
1007                 if (ret != LDB_SUCCESS) return ret;
1008                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1009                         "countryCode", "0");
1010                 if (ret != LDB_SUCCESS) return ret;
1011                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1012                         "lastLogoff", "0");
1013                 if (ret != LDB_SUCCESS) return ret;
1014                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1015                         "lastLogon", "0");
1016                 if (ret != LDB_SUCCESS) return ret;
1017                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1018                         "logonCount", "0");
1019                 if (ret != LDB_SUCCESS) return ret;
1020                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1021                         "pwdLastSet", "0");
1022                 if (ret != LDB_SUCCESS) return ret;
1023
1024                 /* On add operations we might need to generate a
1025                  * "userAccountControl" (if it isn't specified). */
1026                 el = ldb_msg_find_element(ac->msg, "userAccountControl");
1027                 if ((el == NULL) && (ac->req->operation == LDB_ADD)) {
1028                         ret = samdb_msg_set_uint(ldb, ac->msg, ac->msg,
1029                                                  "userAccountControl",
1030                                                  UF_NORMAL_ACCOUNT);
1031                         if (ret != LDB_SUCCESS) {
1032                                 return ret;
1033                         }
1034                         uac_generated = true;
1035                         uac_add_flags = true;
1036                 }
1037
1038                 el = ldb_msg_find_element(ac->msg, "userAccountControl");
1039                 if (el != NULL) {
1040                         uint32_t user_account_control, account_type;
1041
1042                         /* Step 1.3: "userAccountControl" -> "sAMAccountType" mapping */
1043                         user_account_control = ldb_msg_find_attr_as_uint(ac->msg,
1044                                                                          "userAccountControl",
1045                                                                          0);
1046                         /* "userAccountControl" = 0 means "UF_NORMAL_ACCOUNT" */
1047                         if (user_account_control == 0) {
1048                                 user_account_control = UF_NORMAL_ACCOUNT;
1049                                 uac_generated = true;
1050                         }
1051
1052                         /* Temporary duplicate accounts aren't allowed */
1053                         if ((user_account_control & UF_TEMP_DUPLICATE_ACCOUNT) != 0) {
1054                                 return LDB_ERR_OTHER;
1055                         }
1056
1057                         /* Workstation and (read-only) DC objects do need objectclass "computer" */
1058                         if ((samdb_find_attribute(ldb, ac->msg,
1059                                                   "objectclass", "computer") == NULL) &&
1060                             (user_account_control &
1061                              (UF_SERVER_TRUST_ACCOUNT | UF_WORKSTATION_TRUST_ACCOUNT))) {
1062                                 ldb_set_errstring(ldb,
1063                                                   "samldb: Requested account type does need objectclass 'computer'!");
1064                                 return LDB_ERR_OBJECT_CLASS_VIOLATION;
1065                         }
1066
1067                         account_type = ds_uf2atype(user_account_control);
1068                         if (account_type == 0) {
1069                                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
1070                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1071                         }
1072                         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
1073                                                  "sAMAccountType",
1074                                                  account_type);
1075                         if (ret != LDB_SUCCESS) {
1076                                 return ret;
1077                         }
1078                         el2 = ldb_msg_find_element(ac->msg, "sAMAccountType");
1079                         el2->flags = LDB_FLAG_MOD_REPLACE;
1080
1081                         /* "isCriticalSystemObject" might be set */
1082                         if (user_account_control &
1083                             (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
1084                                 ret = ldb_msg_add_string(ac->msg, "isCriticalSystemObject",
1085                                                          "TRUE");
1086                                 if (ret != LDB_SUCCESS) {
1087                                         return ret;
1088                                 }
1089                                 el2 = ldb_msg_find_element(ac->msg,
1090                                                            "isCriticalSystemObject");
1091                                 el2->flags = LDB_FLAG_MOD_REPLACE;
1092                         } else if (user_account_control & UF_WORKSTATION_TRUST_ACCOUNT) {
1093                                 ret = ldb_msg_add_string(ac->msg, "isCriticalSystemObject",
1094                                                          "FALSE");
1095                                 if (ret != LDB_SUCCESS) {
1096                                         return ret;
1097                                 }
1098                                 el2 = ldb_msg_find_element(ac->msg,
1099                                                            "isCriticalSystemObject");
1100                                 el2->flags = LDB_FLAG_MOD_REPLACE;
1101                         }
1102
1103                         /* Step 1.4: "userAccountControl" -> "primaryGroupID" mapping */
1104                         if (!ldb_msg_find_element(ac->msg, "primaryGroupID")) {
1105                                 uint32_t rid = ds_uf2prim_group_rid(user_account_control);
1106
1107                                 /*
1108                                  * Older AD deployments don't know about the
1109                                  * RODC group
1110                                  */
1111                                 if (rid == DOMAIN_RID_READONLY_DCS) {
1112                                         ret = samldb_prim_group_tester(ac, rid);
1113                                         if (ret != LDB_SUCCESS) {
1114                                                 return ret;
1115                                         }
1116                                 }
1117
1118                                 ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
1119                                                          "primaryGroupID", rid);
1120                                 if (ret != LDB_SUCCESS) {
1121                                         return ret;
1122                                 }
1123                                 el2 = ldb_msg_find_element(ac->msg,
1124                                                            "primaryGroupID");
1125                                 el2->flags = LDB_FLAG_MOD_REPLACE;
1126                         }
1127
1128                         /* Step 1.5: Add additional flags when needed */
1129                         /* Obviously this is done when the "userAccountControl"
1130                          * has been generated here (tested against Windows
1131                          * Server) */
1132                         if (uac_generated) {
1133                                 if (uac_add_flags) {
1134                                         user_account_control |= UF_ACCOUNTDISABLE;
1135                                         user_account_control |= UF_PASSWD_NOTREQD;
1136                                 }
1137
1138                                 ret = samdb_msg_set_uint(ldb, ac->msg, ac->msg,
1139                                                          "userAccountControl",
1140                                                          user_account_control);
1141                                 if (ret != LDB_SUCCESS) {
1142                                         return ret;
1143                                 }
1144                         }
1145                 }
1146                 break;
1147         }
1148
1149         case SAMLDB_TYPE_GROUP: {
1150                 const char *tempstr;
1151
1152                 /* Step 2.2: Default values */
1153                 tempstr = talloc_asprintf(ac->msg, "%d",
1154                                           GTYPE_SECURITY_GLOBAL_GROUP);
1155                 if (tempstr == NULL) return ldb_operr(ldb);
1156                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1157                         "groupType", tempstr);
1158                 if (ret != LDB_SUCCESS) return ret;
1159
1160                 /* Step 2.3: "groupType" -> "sAMAccountType" */
1161                 el = ldb_msg_find_element(ac->msg, "groupType");
1162                 if (el != NULL) {
1163                         uint32_t group_type, account_type;
1164
1165                         group_type = ldb_msg_find_attr_as_uint(ac->msg,
1166                                                                "groupType", 0);
1167
1168                         /* The creation of builtin groups requires the
1169                          * RELAX control */
1170                         if (group_type == GTYPE_SECURITY_BUILTIN_LOCAL_GROUP) {
1171                                 if (ldb_request_get_control(ac->req,
1172                                                             LDB_CONTROL_RELAX_OID) == NULL) {
1173                                         return LDB_ERR_UNWILLING_TO_PERFORM;
1174                                 }
1175                         }
1176
1177                         account_type = ds_gtype2atype(group_type);
1178                         if (account_type == 0) {
1179                                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
1180                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1181                         }
1182                         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
1183                                                  "sAMAccountType",
1184                                                  account_type);
1185                         if (ret != LDB_SUCCESS) {
1186                                 return ret;
1187                         }
1188                         el2 = ldb_msg_find_element(ac->msg, "sAMAccountType");
1189                         el2->flags = LDB_FLAG_MOD_REPLACE;
1190                 }
1191                 break;
1192         }
1193
1194         default:
1195                 ldb_asprintf_errstring(ldb,
1196                                 "Invalid entry type!");
1197                 return LDB_ERR_OPERATIONS_ERROR;
1198                 break;
1199         }
1200
1201         return LDB_SUCCESS;
1202 }
1203
1204 /*
1205  * "Primary group ID" trigger (MS-SAMR 3.1.1.8.2)
1206  *
1207  * Has to be invoked on "add" and "modify" operations on "user" and "computer"
1208  * objects.
1209  * ac->msg contains the "add"/"modify" message
1210  */
1211
1212 static int samldb_prim_group_tester(struct samldb_ctx *ac, uint32_t rid)
1213 {
1214         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1215         struct dom_sid *sid;
1216         struct ldb_result *res;
1217         int ret;
1218         const char * const noattrs[] = { NULL };
1219
1220         sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), rid);
1221         if (sid == NULL) {
1222                 return ldb_operr(ldb);
1223         }
1224
1225         ret = dsdb_module_search(ac->module, ac, &res,
1226                                  ldb_get_default_basedn(ldb),
1227                                  LDB_SCOPE_SUBTREE,
1228                                  noattrs, DSDB_FLAG_NEXT_MODULE,
1229                                  ac->req,
1230                                  "(objectSid=%s)",
1231                                  ldap_encode_ndr_dom_sid(ac, sid));
1232         if (ret != LDB_SUCCESS) {
1233                 return ret;
1234         }
1235         if (res->count != 1) {
1236                 talloc_free(res);
1237                 ldb_asprintf_errstring(ldb,
1238                                        "Failed to find primary group with RID %u!",
1239                                        rid);
1240                 return LDB_ERR_UNWILLING_TO_PERFORM;
1241         }
1242         talloc_free(res);
1243
1244         return LDB_SUCCESS;
1245 }
1246
1247 static int samldb_prim_group_set(struct samldb_ctx *ac)
1248 {
1249         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1250         uint32_t rid;
1251
1252         rid = ldb_msg_find_attr_as_uint(ac->msg, "primaryGroupID", (uint32_t) -1);
1253         if (rid == (uint32_t) -1) {
1254                 /* we aren't affected of any primary group set */
1255                 return LDB_SUCCESS;
1256
1257         } else if (!ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
1258                 ldb_set_errstring(ldb,
1259                                   "The primary group isn't settable on add operations!");
1260                 return LDB_ERR_UNWILLING_TO_PERFORM;
1261         }
1262
1263         return samldb_prim_group_tester(ac, rid);
1264 }
1265
1266 static int samldb_prim_group_change(struct samldb_ctx *ac)
1267 {
1268         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1269         const char * const attrs[] = { "primaryGroupID", "memberOf", NULL };
1270         struct ldb_result *res, *group_res;
1271         struct ldb_message_element *el;
1272         struct ldb_message *msg;
1273         uint32_t prev_rid, new_rid;
1274         struct dom_sid *prev_sid, *new_sid;
1275         struct ldb_dn *prev_prim_group_dn, *new_prim_group_dn;
1276         int ret;
1277         const char * const noattrs[] = { NULL };
1278
1279         el = dsdb_get_single_valued_attr(ac->msg, "primaryGroupID",
1280                                          ac->req->operation);
1281         if (el == NULL) {
1282                 /* we are not affected */
1283                 return LDB_SUCCESS;
1284         }
1285
1286         /* Fetch information from the existing object */
1287
1288         ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, attrs,
1289                                     DSDB_FLAG_NEXT_MODULE, ac->req);
1290         if (ret != LDB_SUCCESS) {
1291                 return ret;
1292         }
1293
1294         /* Finds out the DN of the old primary group */
1295
1296         prev_rid = ldb_msg_find_attr_as_uint(res->msgs[0], "primaryGroupID",
1297                                              (uint32_t) -1);
1298         if (prev_rid == (uint32_t) -1) {
1299                 /* User objects do always have a mandatory "primaryGroupID"
1300                  * attribute. If this doesn't exist then the object is of the
1301                  * wrong type. This is the exact Windows error code */
1302                 return LDB_ERR_OBJECT_CLASS_VIOLATION;
1303         }
1304
1305         prev_sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), prev_rid);
1306         if (prev_sid == NULL) {
1307                 return ldb_operr(ldb);
1308         }
1309
1310         /* Finds out the DN of the new primary group
1311          * Notice: in order to parse the primary group ID correctly we create
1312          * a temporary message here. */
1313
1314         msg = ldb_msg_new(ac->msg);
1315         if (msg == NULL) {
1316                 return ldb_module_oom(ac->module);
1317         }
1318         ret = ldb_msg_add(msg, el, 0);
1319         if (ret != LDB_SUCCESS) {
1320                 return ret;
1321         }
1322         new_rid = ldb_msg_find_attr_as_uint(msg, "primaryGroupID", (uint32_t) -1);
1323         talloc_free(msg);
1324         if (new_rid == (uint32_t) -1) {
1325                 /* we aren't affected of any primary group change */
1326                 return LDB_SUCCESS;
1327         }
1328
1329         if (prev_rid == new_rid) {
1330                 return LDB_SUCCESS;
1331         }
1332
1333         ret = dsdb_module_search(ac->module, ac, &group_res,
1334                                  ldb_get_default_basedn(ldb),
1335                                  LDB_SCOPE_SUBTREE,
1336                                  noattrs, DSDB_FLAG_NEXT_MODULE,
1337                                  ac->req,
1338                                  "(objectSid=%s)",
1339                                  ldap_encode_ndr_dom_sid(ac, prev_sid));
1340         if (ret != LDB_SUCCESS) {
1341                 return ret;
1342         }
1343         if (group_res->count != 1) {
1344                 return ldb_operr(ldb);
1345         }
1346         prev_prim_group_dn = group_res->msgs[0]->dn;
1347
1348         new_sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), new_rid);
1349         if (new_sid == NULL) {
1350                 return ldb_operr(ldb);
1351         }
1352
1353         ret = dsdb_module_search(ac->module, ac, &group_res,
1354                                  ldb_get_default_basedn(ldb),
1355                                  LDB_SCOPE_SUBTREE,
1356                                  noattrs, DSDB_FLAG_NEXT_MODULE,
1357                                  ac->req,
1358                                  "(objectSid=%s)",
1359                                  ldap_encode_ndr_dom_sid(ac, new_sid));
1360         if (ret != LDB_SUCCESS) {
1361                 return ret;
1362         }
1363         if (group_res->count != 1) {
1364                 /* Here we know if the specified new primary group candidate is
1365                  * valid or not. */
1366                 return LDB_ERR_UNWILLING_TO_PERFORM;
1367         }
1368         new_prim_group_dn = group_res->msgs[0]->dn;
1369
1370         /* We need to be already a normal member of the new primary
1371          * group in order to be successful. */
1372         el = samdb_find_attribute(ldb, res->msgs[0], "memberOf",
1373                                   ldb_dn_get_linearized(new_prim_group_dn));
1374         if (el == NULL) {
1375                 return LDB_ERR_UNWILLING_TO_PERFORM;
1376         }
1377
1378         /* Remove the "member" attribute on the new primary group */
1379         msg = ldb_msg_new(ac->msg);
1380         if (msg == NULL) {
1381                 return ldb_module_oom(ac->module);
1382         }
1383         msg->dn = new_prim_group_dn;
1384
1385         ret = samdb_msg_add_delval(ldb, msg, msg, "member",
1386                                    ldb_dn_get_linearized(ac->msg->dn));
1387         if (ret != LDB_SUCCESS) {
1388                 return ret;
1389         }
1390
1391         ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE, ac->req);
1392         if (ret != LDB_SUCCESS) {
1393                 return ret;
1394         }
1395         talloc_free(msg);
1396
1397         /* Add a "member" attribute for the previous primary group */
1398         msg = ldb_msg_new(ac->msg);
1399         if (msg == NULL) {
1400                 return ldb_module_oom(ac->module);
1401         }
1402         msg->dn = prev_prim_group_dn;
1403
1404         ret = samdb_msg_add_addval(ldb, msg, msg, "member",
1405                                    ldb_dn_get_linearized(ac->msg->dn));
1406         if (ret != LDB_SUCCESS) {
1407                 return ret;
1408         }
1409
1410         ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE, ac->req);
1411         if (ret != LDB_SUCCESS) {
1412                 return ret;
1413         }
1414         talloc_free(msg);
1415
1416         return LDB_SUCCESS;
1417 }
1418
1419 static int samldb_prim_group_trigger(struct samldb_ctx *ac)
1420 {
1421         int ret;
1422
1423         if (ac->req->operation == LDB_ADD) {
1424                 ret = samldb_prim_group_set(ac);
1425         } else {
1426                 ret = samldb_prim_group_change(ac);
1427         }
1428
1429         return ret;
1430 }
1431
1432
1433 /**
1434  * This function is called on LDB modify operations. It performs some additions/
1435  * replaces on the current LDB message when "userAccountControl" changes.
1436  */
1437 static int samldb_user_account_control_change(struct samldb_ctx *ac)
1438 {
1439         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1440         uint32_t user_account_control, old_user_account_control, account_type;
1441         struct ldb_message_element *el;
1442         struct ldb_message *tmp_msg;
1443         int ret;
1444         struct ldb_result *res;
1445         const char * const attrs[] = { "userAccountControl", "objectClass", NULL };
1446         unsigned int i;
1447         bool is_computer = false;
1448
1449         el = dsdb_get_single_valued_attr(ac->msg, "userAccountControl",
1450                                          ac->req->operation);
1451         if (el == NULL) {
1452                 /* we are not affected */
1453                 return LDB_SUCCESS;
1454         }
1455
1456         /* Create a temporary message for fetching the "userAccountControl" */
1457         tmp_msg = ldb_msg_new(ac->msg);
1458         if (tmp_msg == NULL) {
1459                 return ldb_module_oom(ac->module);
1460         }
1461         ret = ldb_msg_add(tmp_msg, el, 0);
1462         if (ret != LDB_SUCCESS) {
1463                 return ret;
1464         }
1465         user_account_control = ldb_msg_find_attr_as_uint(tmp_msg,
1466                                                          "userAccountControl",
1467                                                          0);
1468         talloc_free(tmp_msg);
1469
1470         /* Temporary duplicate accounts aren't allowed */
1471         if ((user_account_control & UF_TEMP_DUPLICATE_ACCOUNT) != 0) {
1472                 return LDB_ERR_OTHER;
1473         }
1474
1475         /* Fetch the old "userAccountControl" and "objectClass" */
1476         ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, attrs,
1477                                     DSDB_FLAG_NEXT_MODULE, ac->req);
1478         if (ret != LDB_SUCCESS) {
1479                 return ret;
1480         }
1481         old_user_account_control = ldb_msg_find_attr_as_uint(res->msgs[0], "userAccountControl", 0);
1482         if (old_user_account_control == 0) {
1483                 return ldb_operr(ldb);
1484         }
1485         el = ldb_msg_find_element(res->msgs[0], "objectClass");
1486         if (el == NULL) {
1487                 return ldb_operr(ldb);
1488         }
1489
1490         /* When we do not have objectclass "computer" we cannot switch to a (read-only) DC */
1491         for (i = 0; i < el->num_values; i++) {
1492                 if (ldb_attr_cmp((char *)el->values[i].data, "computer") == 0) {
1493                         is_computer = true;
1494                         break;
1495                 }
1496         }
1497         if (!is_computer &&
1498             (user_account_control & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT))) {
1499                 ldb_set_errstring(ldb,
1500                                   "samldb: Requested account type does need objectclass 'computer'!");
1501                 return LDB_ERR_UNWILLING_TO_PERFORM;
1502         }
1503
1504         /*
1505          * The functions "ds_uf2atype" and "ds_uf2prim_group_rid" are used as
1506          * detectors for account type changes.
1507          * So if the account type does change then we need to adjust the
1508          * "sAMAccountType", the "isCriticalSystemObject" and the
1509          * "primaryGroupID" attribute.
1510          */
1511         if ((ds_uf2atype(user_account_control)
1512              == ds_uf2atype(old_user_account_control)) &&
1513             (ds_uf2prim_group_rid(user_account_control)
1514              == ds_uf2prim_group_rid(old_user_account_control))) {
1515                 return LDB_SUCCESS;
1516         }
1517
1518         account_type = ds_uf2atype(user_account_control);
1519         if (account_type == 0) {
1520                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
1521                 return LDB_ERR_UNWILLING_TO_PERFORM;
1522         }
1523         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "sAMAccountType",
1524                                  account_type);
1525         if (ret != LDB_SUCCESS) {
1526                 return ret;
1527         }
1528         el = ldb_msg_find_element(ac->msg, "sAMAccountType");
1529         el->flags = LDB_FLAG_MOD_REPLACE;
1530
1531         /* "isCriticalSystemObject" might be set/changed */
1532         if (user_account_control
1533             & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
1534                 ret = ldb_msg_add_string(ac->msg, "isCriticalSystemObject",
1535                                          "TRUE");
1536                 if (ret != LDB_SUCCESS) {
1537                         return ret;
1538                 }
1539                 el = ldb_msg_find_element(ac->msg,
1540                                            "isCriticalSystemObject");
1541                 el->flags = LDB_FLAG_MOD_REPLACE;
1542         } else if (user_account_control & UF_WORKSTATION_TRUST_ACCOUNT) {
1543                 ret = ldb_msg_add_string(ac->msg, "isCriticalSystemObject",
1544                                          "FALSE");
1545                 if (ret != LDB_SUCCESS) {
1546                         return ret;
1547                 }
1548                 el = ldb_msg_find_element(ac->msg,
1549                                            "isCriticalSystemObject");
1550                 el->flags = LDB_FLAG_MOD_REPLACE;
1551         }
1552
1553         if (!ldb_msg_find_element(ac->msg, "primaryGroupID")) {
1554                 uint32_t rid = ds_uf2prim_group_rid(user_account_control);
1555
1556                 /* Older AD deployments don't know about the RODC group */
1557                 if (rid == DOMAIN_RID_READONLY_DCS) {
1558                         ret = samldb_prim_group_tester(ac, rid);
1559                         if (ret != LDB_SUCCESS) {
1560                                 return ret;
1561                         }
1562                 }
1563
1564                 ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
1565                                          "primaryGroupID", rid);
1566                 if (ret != LDB_SUCCESS) {
1567                         return ret;
1568                 }
1569                 el = ldb_msg_find_element(ac->msg,
1570                                            "primaryGroupID");
1571                 el->flags = LDB_FLAG_MOD_REPLACE;
1572         }
1573
1574         return LDB_SUCCESS;
1575 }
1576
1577 static int samldb_group_type_change(struct samldb_ctx *ac)
1578 {
1579         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1580         uint32_t group_type, old_group_type, account_type;
1581         struct ldb_message_element *el;
1582         struct ldb_message *tmp_msg;
1583         int ret;
1584         struct ldb_result *res;
1585         const char * const attrs[] = { "groupType", NULL };
1586
1587         el = dsdb_get_single_valued_attr(ac->msg, "groupType",
1588                                          ac->req->operation);
1589         if (el == NULL) {
1590                 /* we are not affected */
1591                 return LDB_SUCCESS;
1592         }
1593
1594         /* Create a temporary message for fetching the "groupType" */
1595         tmp_msg = ldb_msg_new(ac->msg);
1596         if (tmp_msg == NULL) {
1597                 return ldb_module_oom(ac->module);
1598         }
1599         ret = ldb_msg_add(tmp_msg, el, 0);
1600         if (ret != LDB_SUCCESS) {
1601                 return ret;
1602         }
1603         group_type = ldb_msg_find_attr_as_uint(tmp_msg, "groupType", 0);
1604         talloc_free(tmp_msg);
1605
1606         ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, attrs,
1607                                     DSDB_FLAG_NEXT_MODULE |
1608                                     DSDB_SEARCH_SHOW_DELETED, ac->req);
1609         if (ret != LDB_SUCCESS) {
1610                 return ret;
1611         }
1612         old_group_type = ldb_msg_find_attr_as_uint(res->msgs[0], "groupType", 0);
1613         if (old_group_type == 0) {
1614                 return ldb_operr(ldb);
1615         }
1616
1617         /* Group type switching isn't so easy as it seems: We can only
1618          * change in this directions: global <-> universal <-> local
1619          * On each step also the group type itself
1620          * (security/distribution) is variable. */
1621
1622         if (ldb_request_get_control(ac->req, LDB_CONTROL_PROVISION_OID) == NULL) {
1623                 switch (group_type) {
1624                 case GTYPE_SECURITY_GLOBAL_GROUP:
1625                 case GTYPE_DISTRIBUTION_GLOBAL_GROUP:
1626                         /* change to "universal" allowed */
1627                         if ((old_group_type == GTYPE_SECURITY_DOMAIN_LOCAL_GROUP) ||
1628                         (old_group_type == GTYPE_DISTRIBUTION_DOMAIN_LOCAL_GROUP)) {
1629                                 ldb_set_errstring(ldb,
1630                                         "samldb: Change from security/distribution local group forbidden!");
1631                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1632                         }
1633                 break;
1634
1635                 case GTYPE_SECURITY_UNIVERSAL_GROUP:
1636                 case GTYPE_DISTRIBUTION_UNIVERSAL_GROUP:
1637                         /* each change allowed */
1638                 break;
1639                 case GTYPE_SECURITY_DOMAIN_LOCAL_GROUP:
1640                 case GTYPE_DISTRIBUTION_DOMAIN_LOCAL_GROUP:
1641                         /* change to "universal" allowed */
1642                         if ((old_group_type == GTYPE_SECURITY_GLOBAL_GROUP) ||
1643                         (old_group_type == GTYPE_DISTRIBUTION_GLOBAL_GROUP)) {
1644                                 ldb_set_errstring(ldb,
1645                                         "samldb: Change from security/distribution global group forbidden!");
1646                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1647                         }
1648                 break;
1649
1650                 case GTYPE_SECURITY_BUILTIN_LOCAL_GROUP:
1651                 default:
1652                         /* we don't allow this "groupType" values */
1653                         return LDB_ERR_UNWILLING_TO_PERFORM;
1654                 break;
1655                 }
1656         }
1657
1658         account_type =  ds_gtype2atype(group_type);
1659         if (account_type == 0) {
1660                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
1661                 return LDB_ERR_UNWILLING_TO_PERFORM;
1662         }
1663         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "sAMAccountType",
1664                                  account_type);
1665         if (ret != LDB_SUCCESS) {
1666                 return ret;
1667         }
1668         el = ldb_msg_find_element(ac->msg, "sAMAccountType");
1669         el->flags = LDB_FLAG_MOD_REPLACE;
1670
1671         return LDB_SUCCESS;
1672 }
1673
1674 static int samldb_sam_accountname_check(struct samldb_ctx *ac)
1675 {
1676         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1677         const char * const no_attrs[] = { NULL };
1678         struct ldb_result *res;
1679         const char *sam_accountname, *enc_str;
1680         struct ldb_message_element *el;
1681         struct ldb_message *tmp_msg;
1682         int ret;
1683
1684         el = dsdb_get_single_valued_attr(ac->msg, "sAMAccountName",
1685                                          ac->req->operation);
1686         if (el == NULL) {
1687                 /* we are not affected */
1688                 return LDB_SUCCESS;
1689         }
1690
1691         /* Create a temporary message for fetching the "sAMAccountName" */
1692         tmp_msg = ldb_msg_new(ac->msg);
1693         if (tmp_msg == NULL) {
1694                 return ldb_module_oom(ac->module);
1695         }
1696         ret = ldb_msg_add(tmp_msg, el, 0);
1697         if (ret != LDB_SUCCESS) {
1698                 return ret;
1699         }
1700
1701         /* We must not steal the original string, it belongs to the caller! */
1702         sam_accountname = talloc_strdup(ac,
1703                                         ldb_msg_find_attr_as_string(tmp_msg, "sAMAccountName", NULL));
1704         talloc_free(tmp_msg);
1705
1706         if (sam_accountname == NULL) {
1707                 /* The "sAMAccountName" cannot be nothing */
1708                 ldb_set_errstring(ldb,
1709                                   "samldb: Empty account names aren't allowed!");
1710                 return LDB_ERR_UNWILLING_TO_PERFORM;
1711         }
1712
1713         enc_str = ldb_binary_encode_string(ac, sam_accountname);
1714         if (enc_str == NULL) {
1715                 return ldb_module_oom(ac->module);
1716         }
1717
1718         /* Make sure that a "sAMAccountName" is only used once */
1719
1720         ret = dsdb_module_search(ac->module, ac, &res,
1721                                  ldb_get_default_basedn(ldb),
1722                                  LDB_SCOPE_SUBTREE, no_attrs,
1723                                  DSDB_FLAG_NEXT_MODULE, ac->req,
1724                                  "(sAMAccountName=%s)", enc_str);
1725         if (ret != LDB_SUCCESS) {
1726                 return ret;
1727         }
1728         if (res->count > 1) {
1729                 return ldb_operr(ldb);
1730         } else if (res->count == 1) {
1731                 if (ldb_dn_compare(res->msgs[0]->dn, ac->msg->dn) != 0) {
1732                         ldb_asprintf_errstring(ldb,
1733                                                "samldb: Account name (sAMAccountName) '%s' already in use!",
1734                                                sam_accountname);
1735                         return LDB_ERR_ENTRY_ALREADY_EXISTS;
1736                 }
1737         }
1738         talloc_free(res);
1739
1740         return LDB_SUCCESS;
1741 }
1742
1743 static int samldb_member_check(struct samldb_ctx *ac)
1744 {
1745         const char * const attrs[] = { "objectSid", NULL };
1746         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1747         struct ldb_message_element *el;
1748         struct ldb_dn *member_dn;
1749         struct dom_sid *sid;
1750         struct ldb_result *res;
1751         struct dom_sid *group_sid;
1752         unsigned int i, j;
1753         int ret;
1754
1755         /* Fetch information from the existing object */
1756
1757         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1758                                  DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED, ac->req, NULL);
1759         if (ret != LDB_SUCCESS) {
1760                 return ret;
1761         }
1762         if (res->count != 1) {
1763                 return ldb_operr(ldb);
1764         }
1765
1766         group_sid = samdb_result_dom_sid(res, res->msgs[0], "objectSid");
1767         if (group_sid == NULL) {
1768                 return ldb_operr(ldb);
1769         }
1770
1771         /* We've to walk over all modification entries and consider the "member"
1772          * ones. */
1773         for (i = 0; i < ac->msg->num_elements; i++) {
1774                 if (ldb_attr_cmp(ac->msg->elements[i].name, "member") != 0) {
1775                         continue;
1776                 }
1777
1778                 el = &ac->msg->elements[i];
1779                 for (j = 0; j < el->num_values; j++) {
1780                         struct ldb_result *group_res;
1781                         const char *group_attrs[] = { "primaryGroupID" , NULL };
1782                         uint32_t prim_group_rid;
1783
1784                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
1785                                 /* Deletes will be handled in
1786                                  * repl_meta_data, and deletes not
1787                                  * matching a member will return
1788                                  * LDB_ERR_UNWILLING_TO_PERFORM
1789                                  * there */
1790                                 continue;
1791                         }
1792
1793                         member_dn = ldb_dn_from_ldb_val(ac, ldb,
1794                                                         &el->values[j]);
1795                         if (!ldb_dn_validate(member_dn)) {
1796                                 return ldb_operr(ldb);
1797                         }
1798
1799                         /* Denies to add "member"s to groups which are primary
1800                          * ones for them - in this case return
1801                          * ERR_ENTRY_ALREADY_EXISTS. */
1802
1803                         ret = dsdb_module_search_dn(ac->module, ac, &group_res,
1804                                                     member_dn, group_attrs,
1805                                                     DSDB_FLAG_NEXT_MODULE, ac->req);
1806                         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1807                                 /* member DN doesn't exist yet */
1808                                 continue;
1809                         }
1810                         if (ret != LDB_SUCCESS) {
1811                                 return ret;
1812                         }
1813                         prim_group_rid = ldb_msg_find_attr_as_uint(group_res->msgs[0], "primaryGroupID", (uint32_t)-1);
1814                         if (prim_group_rid == (uint32_t) -1) {
1815                                 /* the member hasn't to be a user account ->
1816                                  * therefore no check needed in this case. */
1817                                 continue;
1818                         }
1819
1820                         sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb),
1821                                               prim_group_rid);
1822                         if (sid == NULL) {
1823                                 return ldb_operr(ldb);
1824                         }
1825
1826                         if (dom_sid_equal(group_sid, sid)) {
1827                                 ldb_asprintf_errstring(ldb,
1828                                                        "samldb: member %s already set via primaryGroupID %u",
1829                                                        ldb_dn_get_linearized(member_dn), prim_group_rid);
1830                                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
1831                         }
1832                 }
1833         }
1834
1835         talloc_free(res);
1836
1837         return LDB_SUCCESS;
1838 }
1839
1840 /* SAM objects have special rules regarding the "description" attribute on
1841  * modify operations. */
1842 static int samldb_description_check(struct samldb_ctx *ac, bool *modified)
1843 {
1844         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1845         const char * const attrs[] = { "objectClass", "description", NULL };
1846         struct ldb_result *res;
1847         unsigned int i;
1848         int ret;
1849
1850         /* Fetch information from the existing object */
1851         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1852                                  DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED, ac->req,
1853                                  "(|(objectclass=user)(objectclass=group)(objectclass=samDomain)(objectclass=samServer))");
1854         if (ret != LDB_SUCCESS) {
1855                 /* don't treat it specially ... let normal error codes
1856                    happen from other places */
1857                 ldb_reset_err_string(ldb);
1858                 return LDB_SUCCESS;
1859         }
1860         if (res->count == 0) {
1861                 /* we didn't match the filter */
1862                 talloc_free(res);
1863                 return LDB_SUCCESS;
1864         }
1865
1866         /* We've to walk over all modification entries and consider the
1867          * "description" ones. */
1868         for (i = 0; i < ac->msg->num_elements; i++) {
1869                 if (ldb_attr_cmp(ac->msg->elements[i].name, "description") == 0) {
1870                         ac->msg->elements[i].flags |= LDB_FLAG_INTERNAL_FORCE_SINGLE_VALUE_CHECK;
1871                         *modified = true;
1872                 }
1873         }
1874
1875         talloc_free(res);
1876
1877         return LDB_SUCCESS;
1878 }
1879
1880 /* This trigger adapts the "servicePrincipalName" attributes if the
1881  * "dNSHostName" and/or "sAMAccountName" attribute change(s) */
1882 static int samldb_service_principal_names_change(struct samldb_ctx *ac)
1883 {
1884         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1885         struct ldb_message_element *el = NULL, *el2 = NULL;
1886         struct ldb_message *msg;
1887         const char * const attrs[] = { "servicePrincipalName", NULL };
1888         struct ldb_result *res;
1889         const char *dns_hostname = NULL, *old_dns_hostname = NULL,
1890                    *sam_accountname = NULL, *old_sam_accountname = NULL;
1891         unsigned int i, j;
1892         int ret;
1893
1894         el = dsdb_get_single_valued_attr(ac->msg, "dNSHostName",
1895                                          ac->req->operation);
1896         el2 = dsdb_get_single_valued_attr(ac->msg, "sAMAccountName",
1897                                           ac->req->operation);
1898         if ((el == NULL) && (el2 == NULL)) {
1899                 /* we are not affected */
1900                 return LDB_SUCCESS;
1901         }
1902
1903         /* Create a temporary message for fetching the "dNSHostName" */
1904         if (el != NULL) {
1905                 const char *dns_attrs[] = { "dNSHostName", NULL };
1906                 msg = ldb_msg_new(ac->msg);
1907                 if (msg == NULL) {
1908                         return ldb_module_oom(ac->module);
1909                 }
1910                 ret = ldb_msg_add(msg, el, 0);
1911                 if (ret != LDB_SUCCESS) {
1912                         return ret;
1913                 }
1914                 dns_hostname = talloc_strdup(ac,
1915                                              ldb_msg_find_attr_as_string(msg, "dNSHostName", NULL));
1916                 if (dns_hostname == NULL) {
1917                         return ldb_module_oom(ac->module);
1918                 }
1919
1920                 talloc_free(msg);
1921
1922                 ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn,
1923                                             dns_attrs, DSDB_FLAG_NEXT_MODULE, ac->req);
1924                 if (ret == LDB_SUCCESS) {
1925                         old_dns_hostname = ldb_msg_find_attr_as_string(res->msgs[0], "dNSHostName", NULL);
1926                 }
1927         }
1928
1929         /* Create a temporary message for fetching the "sAMAccountName" */
1930         if (el2 != NULL) {
1931                 char *tempstr, *tempstr2;
1932                 const char *acct_attrs[] = { "sAMAccountName", NULL };
1933
1934                 msg = ldb_msg_new(ac->msg);
1935                 if (msg == NULL) {
1936                         return ldb_module_oom(ac->module);
1937                 }
1938                 ret = ldb_msg_add(msg, el2, 0);
1939                 if (ret != LDB_SUCCESS) {
1940                         return ret;
1941                 }
1942                 tempstr = talloc_strdup(ac,
1943                                         ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL));
1944                 talloc_free(msg);
1945
1946                 ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, acct_attrs,
1947                                             DSDB_FLAG_NEXT_MODULE, ac->req);
1948                 if (ret == LDB_SUCCESS) {
1949                         tempstr2 = talloc_strdup(ac,
1950                                                  ldb_msg_find_attr_as_string(res->msgs[0],
1951                                                                              "sAMAccountName", NULL));
1952                 }
1953
1954
1955                 /* The "sAMAccountName" needs some additional trimming: we need
1956                  * to remove the trailing "$"s if they exist. */
1957                 if ((tempstr != NULL) && (tempstr[0] != '\0') &&
1958                     (tempstr[strlen(tempstr) - 1] == '$')) {
1959                         tempstr[strlen(tempstr) - 1] = '\0';
1960                 }
1961                 if ((tempstr2 != NULL) && (tempstr2[0] != '\0') &&
1962                     (tempstr2[strlen(tempstr2) - 1] == '$')) {
1963                         tempstr2[strlen(tempstr2) - 1] = '\0';
1964                 }
1965                 sam_accountname = tempstr;
1966                 old_sam_accountname = tempstr2;
1967         }
1968
1969         if (old_dns_hostname == NULL) {
1970                 /* we cannot change when the old name is unknown */
1971                 dns_hostname = NULL;
1972         }
1973         if ((old_dns_hostname != NULL) && (dns_hostname != NULL) &&
1974             (strcasecmp_m(old_dns_hostname, dns_hostname) == 0)) {
1975                 /* The "dNSHostName" didn't change */
1976                 dns_hostname = NULL;
1977         }
1978
1979         if (old_sam_accountname == NULL) {
1980                 /* we cannot change when the old name is unknown */
1981                 sam_accountname = NULL;
1982         }
1983         if ((old_sam_accountname != NULL) && (sam_accountname != NULL) &&
1984             (strcasecmp_m(old_sam_accountname, sam_accountname) == 0)) {
1985                 /* The "sAMAccountName" didn't change */
1986                 sam_accountname = NULL;
1987         }
1988
1989         if ((dns_hostname == NULL) && (sam_accountname == NULL)) {
1990                 /* Well, there are information missing (old name(s)) or the
1991                  * names didn't change. We've nothing to do and can exit here */
1992                 return LDB_SUCCESS;
1993         }
1994
1995         /* Potential "servicePrincipalName" changes in the same request have to
1996          * be handled before the update (Windows behaviour). */
1997         el = ldb_msg_find_element(ac->msg, "servicePrincipalName");
1998         if (el != NULL) {
1999                 msg = ldb_msg_new(ac->msg);
2000                 if (msg == NULL) {
2001                         return ldb_module_oom(ac->module);
2002                 }
2003                 msg->dn = ac->msg->dn;
2004
2005                 do {
2006                         ret = ldb_msg_add(msg, el, el->flags);
2007                         if (ret != LDB_SUCCESS) {
2008                                 return ret;
2009                         }
2010
2011                         ldb_msg_remove_element(ac->msg, el);
2012
2013                         el = ldb_msg_find_element(ac->msg,
2014                                                   "servicePrincipalName");
2015                 } while (el != NULL);
2016
2017                 ret = dsdb_module_modify(ac->module, msg,
2018                                          DSDB_FLAG_NEXT_MODULE, ac->req);
2019                 if (ret != LDB_SUCCESS) {
2020                         return ret;
2021                 }
2022                 talloc_free(msg);
2023         }
2024
2025         /* Fetch the "servicePrincipalName"s if any */
2026         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
2027                                  DSDB_FLAG_NEXT_MODULE, ac->req, NULL);
2028         if (ret != LDB_SUCCESS) {
2029                 return ret;
2030         }
2031         if ((res->count != 1) || (res->msgs[0]->num_elements > 1)) {
2032                 return ldb_operr(ldb);
2033         }
2034
2035         if (res->msgs[0]->num_elements == 1) {
2036                 /*
2037                  * Yes, we do have "servicePrincipalName"s. First we update them
2038                  * locally, that means we do always substitute the current
2039                  * "dNSHostName" with the new one and/or "sAMAccountName"
2040                  * without "$" with the new one and then we append the
2041                  * modified "servicePrincipalName"s as a message element
2042                  * replace to the modification request (Windows behaviour). We
2043                  * need also to make sure that the values remain case-
2044                  * insensitively unique.
2045                  */
2046
2047                 ret = ldb_msg_add_empty(ac->msg, "servicePrincipalName",
2048                                         LDB_FLAG_MOD_REPLACE, &el);
2049                 if (ret != LDB_SUCCESS) {
2050                         return ret;
2051                 }
2052
2053                 for (i = 0; i < res->msgs[0]->elements[0].num_values; i++) {
2054                         char *old_str, *new_str, *pos;
2055                         const char *tok;
2056                         struct ldb_val *vals;
2057                         bool found = false;
2058
2059                         old_str = (char *)
2060                                 res->msgs[0]->elements[0].values[i].data;
2061
2062                         new_str = talloc_strdup(ac->msg,
2063                                                 strtok_r(old_str, "/", &pos));
2064                         if (new_str == NULL) {
2065                                 return ldb_module_oom(ac->module);
2066                         }
2067
2068                         while ((tok = strtok_r(NULL, "/", &pos)) != NULL) {
2069                                 if ((dns_hostname != NULL) &&
2070                                     (strcasecmp_m(tok, old_dns_hostname) == 0)) {
2071                                         tok = dns_hostname;
2072                                 }
2073                                 if ((sam_accountname != NULL) &&
2074                                     (strcasecmp_m(tok, old_sam_accountname) == 0)) {
2075                                         tok = sam_accountname;
2076                                 }
2077
2078                                 new_str = talloc_asprintf(ac->msg, "%s/%s",
2079                                                           new_str, tok);
2080                                 if (new_str == NULL) {
2081                                         return ldb_module_oom(ac->module);
2082                                 }
2083                         }
2084
2085                         /* Uniqueness check */
2086                         for (j = 0; (!found) && (j < el->num_values); j++) {
2087                                 if (strcasecmp_m((char *)el->values[j].data,
2088                                                new_str) == 0) {
2089                                         found = true;
2090                                 }
2091                         }
2092                         if (found) {
2093                                 continue;
2094                         }
2095
2096                         /*
2097                          * append the new "servicePrincipalName" -
2098                          * code derived from ldb_msg_add_value().
2099                          *
2100                          * Open coded to make it clear that we must
2101                          * append to the MOD_REPLACE el created above.
2102                          */
2103                         vals = talloc_realloc(ac->msg, el->values,
2104                                               struct ldb_val,
2105                                               el->num_values + 1);
2106                         if (vals == NULL) {
2107                                 return ldb_module_oom(ac->module);
2108                         }
2109                         el->values = vals;
2110                         el->values[el->num_values] = data_blob_string_const(new_str);
2111                         ++(el->num_values);
2112                 }
2113         }
2114
2115         talloc_free(res);
2116
2117         return LDB_SUCCESS;
2118 }
2119
2120 /* This checks the "fSMORoleOwner" attributes */
2121 static int samldb_fsmo_role_owner_check(struct samldb_ctx *ac)
2122 {
2123         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
2124         const char * const no_attrs[] = { NULL };
2125         struct ldb_message_element *el;
2126         struct ldb_message *tmp_msg;
2127         struct ldb_dn *res_dn;
2128         struct ldb_result *res;
2129         int ret;
2130
2131         el = dsdb_get_single_valued_attr(ac->msg, "fSMORoleOwner",
2132                                          ac->req->operation);
2133         if (el == NULL) {
2134                 /* we are not affected */
2135                 return LDB_SUCCESS;
2136         }
2137
2138         /* Create a temporary message for fetching the "fSMORoleOwner" */
2139         tmp_msg = ldb_msg_new(ac->msg);
2140         if (tmp_msg == NULL) {
2141                 return ldb_module_oom(ac->module);
2142         }
2143         ret = ldb_msg_add(tmp_msg, el, 0);
2144         if (ret != LDB_SUCCESS) {
2145                 return ret;
2146         }
2147         res_dn = ldb_msg_find_attr_as_dn(ldb, ac, tmp_msg, "fSMORoleOwner");
2148         talloc_free(tmp_msg);
2149
2150         if (res_dn == NULL) {
2151                 ldb_set_errstring(ldb,
2152                                   "samldb: 'fSMORoleOwner' attributes have to reference 'nTDSDSA' entries!");
2153                 if (ac->req->operation == LDB_ADD) {
2154                         return LDB_ERR_CONSTRAINT_VIOLATION;
2155                 } else {
2156                         return LDB_ERR_UNWILLING_TO_PERFORM;
2157                 }
2158         }
2159
2160         /* Fetched DN has to reference a "nTDSDSA" entry */
2161         ret = dsdb_module_search(ac->module, ac, &res, res_dn, LDB_SCOPE_BASE,
2162                                  no_attrs,
2163                                  DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED,
2164                                  ac->req, "(objectClass=nTDSDSA)");
2165         if (ret != LDB_SUCCESS) {
2166                 return ret;
2167         }
2168         if (res->count != 1) {
2169                 ldb_set_errstring(ldb,
2170                                   "samldb: 'fSMORoleOwner' attributes have to reference 'nTDSDSA' entries!");
2171                 return LDB_ERR_UNWILLING_TO_PERFORM;
2172         }
2173
2174         talloc_free(res);
2175
2176         return LDB_SUCCESS;
2177 }
2178
2179
2180 /* add */
2181 static int samldb_add(struct ldb_module *module, struct ldb_request *req)
2182 {
2183         struct ldb_context *ldb;
2184         struct samldb_ctx *ac;
2185         struct ldb_message_element *el;
2186         int ret;
2187
2188         ldb = ldb_module_get_ctx(module);
2189         ldb_debug(ldb, LDB_DEBUG_TRACE, "samldb_add\n");
2190
2191         /* do not manipulate our control entries */
2192         if (ldb_dn_is_special(req->op.add.message->dn)) {
2193                 return ldb_next_request(module, req);
2194         }
2195
2196         ac = samldb_ctx_init(module, req);
2197         if (ac == NULL) {
2198                 return ldb_operr(ldb);
2199         }
2200
2201         /* build the new msg */
2202         ac->msg = ldb_msg_copy_shallow(ac, req->op.add.message);
2203         if (ac->msg == NULL) {
2204                 talloc_free(ac);
2205                 ldb_debug(ldb, LDB_DEBUG_FATAL,
2206                           "samldb_add: ldb_msg_copy_shallow failed!\n");
2207                 return ldb_operr(ldb);
2208         }
2209
2210         el = ldb_msg_find_element(ac->msg, "fSMORoleOwner");
2211         if (el != NULL) {
2212                 ret = samldb_fsmo_role_owner_check(ac);
2213                 if (ret != LDB_SUCCESS) {
2214                         return ret;
2215                 }
2216         }
2217
2218         if (samdb_find_attribute(ldb, ac->msg,
2219                                  "objectclass", "user") != NULL) {
2220                 ac->type = SAMLDB_TYPE_USER;
2221
2222                 ret = samldb_prim_group_trigger(ac);
2223                 if (ret != LDB_SUCCESS) {
2224                         return ret;
2225                 }
2226
2227                 ret = samldb_objectclass_trigger(ac);
2228                 if (ret != LDB_SUCCESS) {
2229                         return ret;
2230                 }
2231
2232                 return samldb_fill_object(ac);
2233         }
2234
2235         if (samdb_find_attribute(ldb, ac->msg,
2236                                  "objectclass", "group") != NULL) {
2237                 ac->type = SAMLDB_TYPE_GROUP;
2238
2239                 ret = samldb_objectclass_trigger(ac);
2240                 if (ret != LDB_SUCCESS) {
2241                         return ret;
2242                 }
2243
2244                 return samldb_fill_object(ac);
2245         }
2246
2247         /* perhaps a foreignSecurityPrincipal? */
2248         if (samdb_find_attribute(ldb, ac->msg,
2249                                  "objectclass",
2250                                  "foreignSecurityPrincipal") != NULL) {
2251                 return samldb_fill_foreignSecurityPrincipal_object(ac);
2252         }
2253
2254         if (samdb_find_attribute(ldb, ac->msg,
2255                                  "objectclass", "classSchema") != NULL) {
2256                 ret = samldb_schema_info_update(ac);
2257                 if (ret != LDB_SUCCESS) {
2258                         talloc_free(ac);
2259                         return ret;
2260                 }
2261
2262                 ac->type = SAMLDB_TYPE_CLASS;
2263                 return samldb_fill_object(ac);
2264         }
2265
2266         if (samdb_find_attribute(ldb, ac->msg,
2267                                  "objectclass", "attributeSchema") != NULL) {
2268                 ret = samldb_schema_info_update(ac);
2269                 if (ret != LDB_SUCCESS) {
2270                         talloc_free(ac);
2271                         return ret;
2272                 }
2273
2274                 ac->type = SAMLDB_TYPE_ATTRIBUTE;
2275                 return samldb_fill_object(ac);
2276         }
2277
2278         talloc_free(ac);
2279
2280         /* nothing matched, go on */
2281         return ldb_next_request(module, req);
2282 }
2283
2284 /* modify */
2285 static int samldb_modify(struct ldb_module *module, struct ldb_request *req)
2286 {
2287         struct ldb_context *ldb;
2288         struct samldb_ctx *ac;
2289         struct ldb_message_element *el, *el2;
2290         bool modified = false;
2291         int ret;
2292
2293         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2294                 /* do not manipulate our control entries */
2295                 return ldb_next_request(module, req);
2296         }
2297
2298         ldb = ldb_module_get_ctx(module);
2299
2300         /* make sure that "objectSid" is not specified */
2301         el = ldb_msg_find_element(req->op.mod.message, "objectSid");
2302         if (el != NULL) {
2303                 if (ldb_request_get_control(req, LDB_CONTROL_PROVISION_OID) == NULL) {
2304                         ldb_set_errstring(ldb,
2305                                           "samldb: objectSid must not be specified!");
2306                         return LDB_ERR_UNWILLING_TO_PERFORM;
2307                 }
2308         }
2309         /* make sure that "sAMAccountType" is not specified */
2310         el = ldb_msg_find_element(req->op.mod.message, "sAMAccountType");
2311         if (el != NULL) {
2312                 ldb_set_errstring(ldb,
2313                                   "samldb: sAMAccountType must not be specified!");
2314                 return LDB_ERR_UNWILLING_TO_PERFORM;
2315         }
2316         /* make sure that "isCriticalSystemObject" is not specified */
2317         el = ldb_msg_find_element(req->op.mod.message, "isCriticalSystemObject");
2318         if (el != NULL) {
2319                 if (ldb_request_get_control(req, LDB_CONTROL_RELAX_OID) == NULL) {
2320                         ldb_set_errstring(ldb,
2321                                           "samldb: isCriticalSystemObject must not be specified!");
2322                         return LDB_ERR_UNWILLING_TO_PERFORM;
2323                 }
2324         }
2325
2326         /* msDS-IntId is not allowed to be modified
2327          * except when modification comes from replication */
2328         if (ldb_msg_find_element(req->op.mod.message, "msDS-IntId")) {
2329                 if (!ldb_request_get_control(req,
2330                                              DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
2331                         return LDB_ERR_CONSTRAINT_VIOLATION;
2332                 }
2333         }
2334
2335         ac = samldb_ctx_init(module, req);
2336         if (ac == NULL) {
2337                 return ldb_operr(ldb);
2338         }
2339
2340         /* build the new msg */
2341         ac->msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2342         if (ac->msg == NULL) {
2343                 talloc_free(ac);
2344                 ldb_debug(ldb, LDB_DEBUG_FATAL,
2345                           "samldb_modify: ldb_msg_copy_shallow failed!\n");
2346                 return ldb_operr(ldb);
2347         }
2348
2349         el = ldb_msg_find_element(ac->msg, "primaryGroupID");
2350         if (el != NULL) {
2351                 ret = samldb_prim_group_trigger(ac);
2352                 if (ret != LDB_SUCCESS) {
2353                         return ret;
2354                 }
2355         }
2356
2357         el = ldb_msg_find_element(ac->msg, "userAccountControl");
2358         if (el != NULL) {
2359                 modified = true;
2360                 ret = samldb_user_account_control_change(ac);
2361                 if (ret != LDB_SUCCESS) {
2362                         return ret;
2363                 }
2364         }
2365
2366         el = ldb_msg_find_element(ac->msg, "groupType");
2367         if (el != NULL) {
2368                 modified = true;
2369                 ret = samldb_group_type_change(ac);
2370                 if (ret != LDB_SUCCESS) {
2371                         return ret;
2372                 }
2373         }
2374
2375         el = ldb_msg_find_element(ac->msg, "sAMAccountName");
2376         if (el != NULL) {
2377                 ret = samldb_sam_accountname_check(ac);
2378                 if (ret != LDB_SUCCESS) {
2379                         return ret;
2380                 }
2381         }
2382
2383         el = ldb_msg_find_element(ac->msg, "member");
2384         if (el != NULL) {
2385                 ret = samldb_member_check(ac);
2386                 if (ret != LDB_SUCCESS) {
2387                         return ret;
2388                 }
2389         }
2390
2391         el = ldb_msg_find_element(ac->msg, "description");
2392         if (el != NULL) {
2393                 ret = samldb_description_check(ac, &modified);
2394                 if (ret != LDB_SUCCESS) {
2395                         return ret;
2396                 }
2397         }
2398
2399         el = ldb_msg_find_element(ac->msg, "dNSHostName");
2400         el2 = ldb_msg_find_element(ac->msg, "sAMAccountName");
2401         if ((el != NULL) || (el2 != NULL)) {
2402                 modified = true;
2403                 ret = samldb_service_principal_names_change(ac);
2404                 if (ret != LDB_SUCCESS) {
2405                         return ret;
2406                 }
2407         }
2408
2409         el = ldb_msg_find_element(ac->msg, "fSMORoleOwner");
2410         if (el != NULL) {
2411                 ret = samldb_fsmo_role_owner_check(ac);
2412                 if (ret != LDB_SUCCESS) {
2413                         return ret;
2414                 }
2415         }
2416
2417         if (modified) {
2418                 struct ldb_request *child_req;
2419
2420                 /* Now perform the real modifications as a child request */
2421                 ret = ldb_build_mod_req(&child_req, ldb, ac,
2422                                         ac->msg,
2423                                         req->controls,
2424                                         req, dsdb_next_callback,
2425                                         req);
2426                 LDB_REQ_SET_LOCATION(child_req);
2427                 if (ret != LDB_SUCCESS) {
2428                         return ret;
2429                 }
2430
2431                 return ldb_next_request(module, child_req);
2432         }
2433
2434         talloc_free(ac);
2435
2436         /* no change which interests us, go on */
2437         return ldb_next_request(module, req);
2438 }
2439
2440 /* delete */
2441
2442 static int samldb_prim_group_users_check(struct samldb_ctx *ac)
2443 {
2444         struct ldb_context *ldb;
2445         struct dom_sid *sid;
2446         uint32_t rid;
2447         NTSTATUS status;
2448         int ret;
2449         struct ldb_result *res;
2450         const char * const attrs[] = { "objectSid", "isDeleted", NULL };
2451         const char * const noattrs[] = { NULL };
2452
2453         ldb = ldb_module_get_ctx(ac->module);
2454
2455         /* Finds out the SID/RID of the SAM object */
2456         ret = dsdb_module_search_dn(ac->module, ac, &res, ac->req->op.del.dn,
2457                                         attrs,
2458                                         DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED,
2459                                         ac->req);
2460         if (ret != LDB_SUCCESS) {
2461                 return ret;
2462         }
2463
2464         if (ldb_msg_check_string_attribute(res->msgs[0], "isDeleted", "TRUE")) {
2465                 return LDB_SUCCESS;
2466         }
2467
2468         sid = samdb_result_dom_sid(ac, res->msgs[0], "objectSid");
2469         if (sid == NULL) {
2470                 /* No SID - it might not be a SAM object - therefore ok */
2471                 return LDB_SUCCESS;
2472         }
2473         status = dom_sid_split_rid(ac, sid, NULL, &rid);
2474         if (!NT_STATUS_IS_OK(status)) {
2475                 return ldb_operr(ldb);
2476         }
2477         if (rid == 0) {
2478                 /* Special object (security principal?) */
2479                 return LDB_SUCCESS;
2480         }
2481
2482         /* Deny delete requests from groups which are primary ones */
2483         ret = dsdb_module_search(ac->module, ac, &res,
2484                                  ldb_get_default_basedn(ldb),
2485                                  LDB_SCOPE_SUBTREE, noattrs,
2486                                  DSDB_FLAG_NEXT_MODULE,
2487                                  ac->req,
2488                                  "(&(primaryGroupID=%u)(objectClass=user))", rid);
2489         if (ret != LDB_SUCCESS) {
2490                 return ret;
2491         }
2492         if (res->count > 0) {
2493                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
2494         }
2495
2496         return LDB_SUCCESS;
2497 }
2498
2499 static int samldb_delete(struct ldb_module *module, struct ldb_request *req)
2500 {
2501         struct samldb_ctx *ac;
2502         int ret;
2503
2504         if (ldb_dn_is_special(req->op.del.dn)) {
2505                 /* do not manipulate our control entries */
2506                 return ldb_next_request(module, req);
2507         }
2508
2509         ac = samldb_ctx_init(module, req);
2510         if (ac == NULL) {
2511                 return ldb_operr(ldb_module_get_ctx(module));
2512         }
2513
2514         ret = samldb_prim_group_users_check(ac);
2515         if (ret != LDB_SUCCESS) {
2516                 return ret;
2517         }
2518
2519         talloc_free(ac);
2520
2521         return ldb_next_request(module, req);
2522 }
2523
2524 /* extended */
2525
2526 static int samldb_extended_allocate_rid_pool(struct ldb_module *module, struct ldb_request *req)
2527 {
2528         struct ldb_context *ldb = ldb_module_get_ctx(module);
2529         struct dsdb_fsmo_extended_op *exop;
2530         int ret;
2531
2532         exop = talloc_get_type(req->op.extended.data,
2533                                struct dsdb_fsmo_extended_op);
2534         if (!exop) {
2535                 ldb_set_errstring(ldb,
2536                                   "samldb_extended_allocate_rid_pool: invalid extended data");
2537                 return LDB_ERR_PROTOCOL_ERROR;
2538         }
2539
2540         ret = ridalloc_allocate_rid_pool_fsmo(module, exop, req);
2541         if (ret != LDB_SUCCESS) {
2542                 return ret;
2543         }
2544
2545         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2546 }
2547
2548 static int samldb_extended(struct ldb_module *module, struct ldb_request *req)
2549 {
2550         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_ALLOCATE_RID_POOL) == 0) {
2551                 return samldb_extended_allocate_rid_pool(module, req);
2552         }
2553
2554         return ldb_next_request(module, req);
2555 }
2556
2557
2558 static const struct ldb_module_ops ldb_samldb_module_ops = {
2559         .name          = "samldb",
2560         .add           = samldb_add,
2561         .modify        = samldb_modify,
2562         .del           = samldb_delete,
2563         .extended      = samldb_extended
2564 };
2565
2566
2567 int ldb_samldb_module_init(const char *version)
2568 {
2569         LDB_MODULE_CHECK_VERSION(version);
2570         return ldb_register_module(&ldb_samldb_module_ops);
2571 }