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