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 2009-2010
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 /*
  23  *  Name: ldb
  24  *
  25  *  Component: ldb samldb module
  26  *
  27  *  Description: various internal DSDB triggers - most for SAM specific objects
  28  *
  29  *  Author: Simo Sorce
  30  */
  31
  32 #include "includes.h"
  33 #include "libcli/ldap/ldap_ndr.h"
  34 #include "ldb_module.h"
  35 #include "dsdb/samdb/samdb.h"
  36 #include "dsdb/samdb/ldb_modules/util.h"
  37 #include "dsdb/samdb/ldb_modules/ridalloc.h"
  38 #include "libcli/security/security.h"
  39 #include "librpc/gen_ndr/ndr_security.h"
  40 #include "ldb_wrap.h"
  41 #include "param/param.h"
  42
  43 struct samldb_ctx;
  44
  45 typedef int (*samldb_step_fn_t)(struct samldb_ctx *);
  46
  47 struct samldb_step {
  48         struct samldb_step *next;
  49         samldb_step_fn_t fn;
  50 };
  51
  52 struct samldb_ctx {
  53         struct ldb_module *module;
  54         struct ldb_request *req;
  55
  56         /* used for add operations */
  57         const char *type;
  58
  59         /* the resulting message */
  60         struct ldb_message *msg;
  61
  62         /* used in "samldb_find_for_defaultObjectCategory" */
  63         struct ldb_dn *dn, *res_dn;
  64
  65         /* all the async steps necessary to complete the operation */
  66         struct samldb_step *steps;
  67         struct samldb_step *curstep;
  68
  69         /* If someone set an ares to forward controls and response back to the caller */
  70         struct ldb_reply *ares;
  71 };
  72
  73 static struct samldb_ctx *samldb_ctx_init(struct ldb_module *module,
  74                                           struct ldb_request *req)
  75 {
  76         struct ldb_context *ldb;
  77         struct samldb_ctx *ac;
  78
  79         ldb = ldb_module_get_ctx(module);
  80
  81         ac = talloc_zero(req, struct samldb_ctx);
  82         if (ac == NULL) {
  83                 ldb_oom(ldb);
  84                 return NULL;
  85         }
  86
  87         ac->module = module;
  88         ac->req = req;
  89
  90         return ac;
  91 }
  92
  93 static int samldb_add_step(struct samldb_ctx *ac, samldb_step_fn_t fn)
  94 {
  95         struct samldb_step *step, *stepper;
  96
  97         step = talloc_zero(ac, struct samldb_step);
  98         if (step == NULL) {
  99                 return ldb_oom(ldb_module_get_ctx(ac->module));
 100         }
 101
 102         step->fn = fn;
 103
 104         if (ac->steps == NULL) {
 105                 ac->steps = step;
 106                 ac->curstep = step;
 107         } else {
 108                 if (ac->curstep == NULL)
 109                         return ldb_operr(ldb_module_get_ctx(ac->module));
 110                 for (stepper = ac->curstep; stepper->next != NULL;
 111                         stepper = stepper->next);
 112                 stepper->next = step;
 113         }
 114
 115         return LDB_SUCCESS;
 116 }
 117
 118 static int samldb_first_step(struct samldb_ctx *ac)
 119 {
 120         if (ac->steps == NULL) {
 121                 return ldb_operr(ldb_module_get_ctx(ac->module));
 122         }
 123
 124         ac->curstep = ac->steps;
 125         return ac->curstep->fn(ac);
 126 }
 127
 128 static int samldb_next_step(struct samldb_ctx *ac)
 129 {
 130         if (ac->curstep->next) {
 131                 ac->curstep = ac->curstep->next;
 132                 return ac->curstep->fn(ac);
 133         }
 134
 135         /* We exit the samldb module here. If someone set an "ares" to forward
 136          * controls and response back to the caller, use them. */
 137         if (ac->ares) {
 138                 return ldb_module_done(ac->req, ac->ares->controls,
 139                                        ac->ares->response, LDB_SUCCESS);
 140         } else {
 141                 return ldb_module_done(ac->req, NULL, NULL, LDB_SUCCESS);
 142         }
 143 }
 144
 145
 146 /* sAMAccountName handling */
 147
 148 static int samldb_generate_sAMAccountName(struct ldb_context *ldb,
 149                                           struct ldb_message *msg)
 150 {
 151         char *name;
 152
 153         /* Format: $000000-000000000000 */
 154
 155         name = talloc_asprintf(msg, "$%.6X-%.6X%.6X",
 156                                 (unsigned int)generate_random(),
 157                                 (unsigned int)generate_random(),
 158                                 (unsigned int)generate_random());
 159         if (name == NULL) {
 160                 return ldb_oom(ldb);
 161         }
 162         return ldb_msg_add_steal_string(msg, "sAMAccountName", name);
 163 }
 164
 165 static int samldb_check_sAMAccountName(struct samldb_ctx *ac)
 166 {
 167         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 168         const char *name;
 169         int ret;
 170
 171         if (ldb_msg_find_element(ac->msg, "sAMAccountName") == NULL) {
 172                 ret = samldb_generate_sAMAccountName(ldb, ac->msg);
 173                 if (ret != LDB_SUCCESS) {
 174                         return ret;
 175                 }
 176         }
 177
 178         name = ldb_msg_find_attr_as_string(ac->msg, "sAMAccountName", NULL);
 179         if (name == NULL) {
 180                 /* The "sAMAccountName" cannot be nothing */
 181                 ldb_set_errstring(ldb,
 182                                   "samldb: Empty account names aren't allowed!");
 183                 return LDB_ERR_CONSTRAINT_VIOLATION;
 184         }
 185
 186         ret = samdb_search_count(ldb, ac, NULL, "(sAMAccountName=%s)",
 187                                  ldb_binary_encode_string(ac, name));
 188         if ((ret < 0) || (ret > 1)) {
 189                 return ldb_operr(ldb);
 190         }
 191         if (ret == 1) {
 192                 ldb_asprintf_errstring(ldb,
 193                                        "samldb: Account name (sAMAccountName) '%s' already in use!",
 194                                        name);
 195                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
 196         }
 197
 198         return samldb_next_step(ac);
 199 }
 200
 201
 202 static bool samldb_msg_add_sid(struct ldb_message *msg,
 203                                 const char *name,
 204                                 const struct dom_sid *sid)
 205 {
 206         struct ldb_val v;
 207         enum ndr_err_code ndr_err;
 208
 209         ndr_err = ndr_push_struct_blob(&v, msg, sid,
 210                                        (ndr_push_flags_fn_t)ndr_push_dom_sid);
 211         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 212                 return false;
 213         }
 214         return (ldb_msg_add_value(msg, name, &v, NULL) == 0);
 215 }
 216
 217
 218 /* allocate a SID using our RID Set */
 219 static int samldb_allocate_sid(struct samldb_ctx *ac)
 220 {
 221         uint32_t rid;
 222         struct dom_sid *sid;
 223         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 224         int ret;
 225
 226         ret = ridalloc_allocate_rid(ac->module, &rid);
 227         if (ret != LDB_SUCCESS) {
 228                 return ret;
 229         }
 230
 231         sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), rid);
 232         if (sid == NULL) {
 233                 return ldb_module_oom(ac->module);
 234         }
 235
 236         if ( ! samldb_msg_add_sid(ac->msg, "objectSid", sid)) {
 237                 return ldb_operr(ldb);
 238         }
 239
 240         return samldb_next_step(ac);
 241 }
 242
 243 /*
 244   see if a krbtgt_number is available
 245  */
 246 static bool samldb_krbtgtnumber_available(struct samldb_ctx *ac,
 247                                           uint32_t krbtgt_number)
 248 {
 249         TALLOC_CTX *tmp_ctx = talloc_new(ac);
 250         struct ldb_result *res;
 251         const char *no_attrs[] = { NULL };
 252         int ret;
 253
 254         ret = dsdb_module_search(ac->module, tmp_ctx, &res, NULL,
 255                                  LDB_SCOPE_SUBTREE, no_attrs,
 256                                  DSDB_FLAG_NEXT_MODULE,
 257                                  "(msDC-SecondaryKrbTgtNumber=%u)",
 258                                  krbtgt_number);
 259         if (ret == LDB_SUCCESS && res->count == 0) {
 260                 talloc_free(tmp_ctx);
 261                 return true;
 262         }
 263         talloc_free(tmp_ctx);
 264         return false;
 265 }
 266
 267 /* special handling for add in RODC join */
 268 static int samldb_rodc_add(struct samldb_ctx *ac)
 269 {
 270         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 271         uint32_t krbtgt_number, i_start, i;
 272         int ret;
 273         char *newpass;
 274         struct ldb_val newpass_utf16;
 275
 276         /* find a unused msDC-SecondaryKrbTgtNumber */
 277         i_start = generate_random() & 0xFFFF;
 278         if (i_start == 0) {
 279                 i_start = 1;
 280         }
 281
 282         for (i=i_start; i<=0xFFFF; i++) {
 283                 if (samldb_krbtgtnumber_available(ac, i)) {
 284                         krbtgt_number = i;
 285                         goto found;
 286                 }
 287         }
 288         for (i=1; i<i_start; i++) {
 289                 if (samldb_krbtgtnumber_available(ac, i)) {
 290                         krbtgt_number = i;
 291                         goto found;
 292                 }
 293         }
 294
 295         ldb_asprintf_errstring(ldb,
 296                                "%08X: Unable to find available msDS-SecondaryKrbTgtNumber",
 297                                W_ERROR_V(WERR_NO_SYSTEM_RESOURCES));
 298         return LDB_ERR_OTHER;
 299
 300 found:
 301         ret = ldb_msg_add_empty(ac->msg, "msDS-SecondaryKrbTgtNumber",
 302                                 LDB_FLAG_INTERNAL_DISABLE_VALIDATION, NULL);
 303         if (ret != LDB_SUCCESS) {
 304                 return ldb_operr(ldb);
 305         }
 306
 307         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
 308                                  "msDS-SecondaryKrbTgtNumber", krbtgt_number);
 309         if (ret != LDB_SUCCESS) {
 310                 return ldb_operr(ldb);
 311         }
 312
 313         ret = ldb_msg_add_fmt(ac->msg, "sAMAccountName", "krbtgt_%u",
 314                               krbtgt_number);
 315         if (ret != LDB_SUCCESS) {
 316                 return ldb_operr(ldb);
 317         }
 318
 319         newpass = generate_random_password(ac->msg, 128, 255);
 320         if (newpass == NULL) {
 321                 return ldb_operr(ldb);
 322         }
 323
 324         if (!convert_string_talloc(ac,
 325                                    CH_UNIX, CH_UTF16,
 326                                    newpass, strlen(newpass),
 327                                    (void *)&newpass_utf16.data,
 328                                    &newpass_utf16.length, false)) {
 329                 ldb_asprintf_errstring(ldb,
 330                                        "samldb_rodc_add: "
 331                                        "failed to generate UTF16 password from random password");
 332                 return LDB_ERR_OPERATIONS_ERROR;
 333         }
 334         ret = ldb_msg_add_steal_value(ac->msg, "clearTextPassword", &newpass_utf16);
 335         if (ret != LDB_SUCCESS) {
 336                 return ldb_operr(ldb);
 337         }
 338
 339         return samldb_next_step(ac);
 340 }
 341
 342 static int samldb_find_for_defaultObjectCategory(struct samldb_ctx *ac)
 343 {
 344         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 345         struct ldb_result *res;
 346         const char *no_attrs[] = { NULL };
 347         int ret;
 348
 349         ac->res_dn = NULL;
 350
 351         ret = dsdb_module_search(ac->module, ac, &res,
 352                                  ac->dn, LDB_SCOPE_BASE, no_attrs,
 353                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT
 354                                  | DSDB_FLAG_NEXT_MODULE,
 355                                  "(objectClass=classSchema)");
 356         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 357                 /* Don't be pricky when the DN doesn't exist if we have the */
 358                 /* RELAX control specified */
 359                 if (ldb_request_get_control(ac->req,
 360                                             LDB_CONTROL_RELAX_OID) == NULL) {
 361                         ldb_set_errstring(ldb,
 362                                           "samldb_find_defaultObjectCategory: "
 363                                           "Invalid DN for 'defaultObjectCategory'!");
 364                         return LDB_ERR_CONSTRAINT_VIOLATION;
 365                 }
 366         }
 367         if ((ret != LDB_ERR_NO_SUCH_OBJECT) && (ret != LDB_SUCCESS)) {
 368                 return ret;
 369         }
 370
 371         ac->res_dn = ac->dn;
 372
 373         return samldb_next_step(ac);
 374 }
 375
 376 /**
 377  * msDS-IntId attributeSchema attribute handling
 378  * during LDB_ADD request processing
 379  */
 380 static int samldb_add_handle_msDS_IntId(struct samldb_ctx *ac)
 381 {
 382         int ret;
 383         bool id_exists;
 384         uint32_t msds_intid;
 385         int32_t system_flags;
 386         struct ldb_context *ldb;
 387         struct ldb_result *ldb_res;
 388         struct ldb_dn *schema_dn;
 389
 390         ldb = ldb_module_get_ctx(ac->module);
 391         schema_dn = ldb_get_schema_basedn(ldb);
 392
 393         /* replicated update should always go through */
 394         if (ldb_request_get_control(ac->req,
 395                                     DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
 396                 return LDB_SUCCESS;
 397         }
 398
 399         /* msDS-IntId is handled by system and should never be
 400          * passed by clients */
 401         if (ldb_msg_find_element(ac->msg, "msDS-IntId")) {
 402                 return LDB_ERR_UNWILLING_TO_PERFORM;
 403         }
 404
 405         /* do not generate msDS-IntId if Relax control is passed */
 406         if (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
 407                 return LDB_SUCCESS;
 408         }
 409
 410         /* check Functional Level */
 411         if (dsdb_functional_level(ldb) < DS_DOMAIN_FUNCTION_2003) {
 412                 return LDB_SUCCESS;
 413         }
 414
 415         /* check systemFlags for SCHEMA_BASE_OBJECT flag */
 416         system_flags = ldb_msg_find_attr_as_int(ac->msg, "systemFlags", 0);
 417         if (system_flags & SYSTEM_FLAG_SCHEMA_BASE_OBJECT) {
 418                 return LDB_SUCCESS;
 419         }
 420
 421         /* Generate new value for msDs-IntId
 422          * Value should be in 0x80000000..0xBFFFFFFF range */
 423         msds_intid = generate_random() % 0X3FFFFFFF;
 424         msds_intid += 0x80000000;
 425
 426         /* probe id values until unique one is found */
 427         do {
 428                 msds_intid++;
 429                 if (msds_intid > 0xBFFFFFFF) {
 430                         msds_intid = 0x80000001;
 431                 }
 432
 433                 ret = dsdb_module_search(ac->module, ac,
 434                                          &ldb_res,
 435                                          schema_dn, LDB_SCOPE_ONELEVEL, NULL,
 436                                          DSDB_FLAG_NEXT_MODULE,
 437                                          "(msDS-IntId=%d)", msds_intid);
 438                 if (ret != LDB_SUCCESS) {
 439                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 440                                       __location__": Searching for msDS-IntId=%d failed - %s\n",
 441                                       msds_intid,
 442                                       ldb_errstring(ldb));
 443                         return ldb_operr(ldb);
 444                 }
 445                 id_exists = (ldb_res->count > 0);
 446
 447                 talloc_free(ldb_res);
 448         } while(id_exists);
 449
 450         return samdb_msg_add_int(ldb, ac->msg, ac->msg, "msDS-IntId",
 451                                  msds_intid);
 452 }
 453
 454
 455 /*
 456  * samldb_add_entry (async)
 457  */
 458
 459 static int samldb_add_entry_callback(struct ldb_request *req,
 460                                         struct ldb_reply *ares)
 461 {
 462         struct ldb_context *ldb;
 463         struct samldb_ctx *ac;
 464         int ret;
 465
 466         ac = talloc_get_type(req->context, struct samldb_ctx);
 467         ldb = ldb_module_get_ctx(ac->module);
 468
 469         if (!ares) {
 470                 return ldb_module_done(ac->req, NULL, NULL,
 471                                         LDB_ERR_OPERATIONS_ERROR);
 472         }
 473
 474         if (ares->type == LDB_REPLY_REFERRAL) {
 475                 return ldb_module_send_referral(ac->req, ares->referral);
 476         }
 477
 478         if (ares->error != LDB_SUCCESS) {
 479                 return ldb_module_done(ac->req, ares->controls,
 480                                         ares->response, ares->error);
 481         }
 482         if (ares->type != LDB_REPLY_DONE) {
 483                 ldb_set_errstring(ldb,
 484                         "Invalid reply type!\n");
 485                 return ldb_module_done(ac->req, NULL, NULL,
 486                                         LDB_ERR_OPERATIONS_ERROR);
 487         }
 488
 489         /* The caller may wish to get controls back from the add */
 490         ac->ares = talloc_steal(ac, ares);
 491
 492         ret = samldb_next_step(ac);
 493         if (ret != LDB_SUCCESS) {
 494                 return ldb_module_done(ac->req, NULL, NULL, ret);
 495         }
 496         return ret;
 497 }
 498
 499 static int samldb_add_entry(struct samldb_ctx *ac)
 500 {
 501         struct ldb_context *ldb;
 502         struct ldb_request *req;
 503         int ret;
 504
 505         ldb = ldb_module_get_ctx(ac->module);
 506
 507         ret = ldb_build_add_req(&req, ldb, ac,
 508                                 ac->msg,
 509                                 ac->req->controls,
 510                                 ac, samldb_add_entry_callback,
 511                                 ac->req);
 512         LDB_REQ_SET_LOCATION(req);
 513         if (ret != LDB_SUCCESS) {
 514                 return ret;
 515         }
 516
 517         return ldb_next_request(ac->module, req);
 518 }
 519
 520 /*
 521  * return true if msg carries an attributeSchema that is intended to be RODC
 522  * filtered but is also a system-critical attribute.
 523  */
 524 static bool check_rodc_critical_attribute(struct ldb_message *msg)
 525 {
 526         uint32_t schemaFlagsEx, searchFlags, rodc_filtered_flags;
 527
 528         schemaFlagsEx = ldb_msg_find_attr_as_uint(msg, "schemaFlagsEx", 0);
 529         searchFlags = ldb_msg_find_attr_as_uint(msg, "searchFlags", 0);
 530         rodc_filtered_flags = (SEARCH_FLAG_RODC_ATTRIBUTE
 531                               | SEARCH_FLAG_CONFIDENTIAL);
 532
 533         if ((schemaFlagsEx & SCHEMA_FLAG_ATTR_IS_CRITICAL) &&
 534                 ((searchFlags & rodc_filtered_flags) == rodc_filtered_flags)) {
 535                 return true;
 536         } else {
 537                 return false;
 538         }
 539 }
 540
 541
 542 static int samldb_fill_object(struct samldb_ctx *ac)
 543 {
 544         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 545         int ret;
 546
 547         /* Add informations for the different account types */
 548         if (strcmp(ac->type, "user") == 0) {
 549                 struct ldb_control *rodc_control = ldb_request_get_control(ac->req,
 550                                                                            LDB_CONTROL_RODC_DCPROMO_OID);
 551                 if (rodc_control != NULL) {
 552                         /* see [MS-ADTS] 3.1.1.3.4.1.23 LDAP_SERVER_RODC_DCPROMO_OID */
 553                         rodc_control->critical = false;
 554                         ret = samldb_add_step(ac, samldb_rodc_add);
 555                         if (ret != LDB_SUCCESS) return ret;
 556                 }
 557
 558                 /* check if we have a valid sAMAccountName */
 559                 ret = samldb_add_step(ac, samldb_check_sAMAccountName);
 560                 if (ret != LDB_SUCCESS) return ret;
 561
 562                 ret = samldb_add_step(ac, samldb_add_entry);
 563                 if (ret != LDB_SUCCESS) return ret;
 564
 565         } else if (strcmp(ac->type, "group") == 0) {
 566                 /* check if we have a valid sAMAccountName */
 567                 ret = samldb_add_step(ac, samldb_check_sAMAccountName);
 568                 if (ret != LDB_SUCCESS) return ret;
 569
 570                 ret = samldb_add_step(ac, samldb_add_entry);
 571                 if (ret != LDB_SUCCESS) return ret;
 572
 573         } else if (strcmp(ac->type, "classSchema") == 0) {
 574                 const struct ldb_val *rdn_value, *def_obj_cat_val;
 575
 576                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 577                                                   "rdnAttId", "cn");
 578                 if (ret != LDB_SUCCESS) return ret;
 579
 580                 /* do not allow to mark an attributeSchema as RODC filtered if it
 581                  * is system-critical */
 582                 if (check_rodc_critical_attribute(ac->msg)) {
 583                         ldb_asprintf_errstring(ldb, "Refusing schema add of %s - cannot combine critical class with RODC filtering",
 584                                                ldb_dn_get_linearized(ac->msg->dn));
 585                         return LDB_ERR_UNWILLING_TO_PERFORM;
 586                 }
 587
 588                 rdn_value = ldb_dn_get_rdn_val(ac->msg->dn);
 589                 if (rdn_value == NULL) {
 590                         return ldb_operr(ldb);
 591                 }
 592                 if (!ldb_msg_find_element(ac->msg, "lDAPDisplayName")) {
 593                         /* the RDN has prefix "CN" */
 594                         ret = ldb_msg_add_string(ac->msg, "lDAPDisplayName",
 595                                 samdb_cn_to_lDAPDisplayName(ac->msg,
 596                                                             (const char *) rdn_value->data));
 597                         if (ret != LDB_SUCCESS) {
 598                                 ldb_oom(ldb);
 599                                 return ret;
 600                         }
 601                 }
 602
 603                 if (!ldb_msg_find_element(ac->msg, "schemaIDGUID")) {
 604                         struct GUID guid;
 605                         /* a new GUID */
 606                         guid = GUID_random();
 607                         ret = dsdb_msg_add_guid(ac->msg, &guid, "schemaIDGUID");
 608                         if (ret != LDB_SUCCESS) {
 609                                 ldb_oom(ldb);
 610                                 return ret;
 611                         }
 612                 }
 613
 614                 def_obj_cat_val = ldb_msg_find_ldb_val(ac->msg,
 615                                                        "defaultObjectCategory");
 616                 if (def_obj_cat_val != NULL) {
 617                         /* "defaultObjectCategory" has been set by the caller.
 618                          * Do some checks for consistency.
 619                          * NOTE: The real constraint check (that
 620                          * 'defaultObjectCategory' is the DN of the new
 621                          * objectclass or any parent of it) is still incomplete.
 622                          * For now we say that 'defaultObjectCategory' is valid
 623                          * if it exists and it is of objectclass "classSchema".
 624                          */
 625                         ac->dn = ldb_dn_from_ldb_val(ac, ldb, def_obj_cat_val);
 626                         if (ac->dn == NULL) {
 627                                 ldb_set_errstring(ldb,
 628                                                   "Invalid DN for 'defaultObjectCategory'!");
 629                                 return LDB_ERR_CONSTRAINT_VIOLATION;
 630                         }
 631                 } else {
 632                         /* "defaultObjectCategory" has not been set by the
 633                          * caller. Use the entry DN for it. */
 634                         ac->dn = ac->msg->dn;
 635
 636                         ret = ldb_msg_add_string(ac->msg, "defaultObjectCategory",
 637                                                  ldb_dn_alloc_linearized(ac->msg, ac->dn));
 638                         if (ret != LDB_SUCCESS) {
 639                                 ldb_oom(ldb);
 640                                 return ret;
 641                         }
 642                 }
 643
 644                 ret = samldb_add_step(ac, samldb_add_entry);
 645                 if (ret != LDB_SUCCESS) return ret;
 646
 647                 /* Now perform the checks for the 'defaultObjectCategory'. The
 648                  * lookup DN was already saved in "ac->dn" */
 649                 ret = samldb_add_step(ac, samldb_find_for_defaultObjectCategory);
 650                 if (ret != LDB_SUCCESS) return ret;
 651
 652         } else if (strcmp(ac->type, "attributeSchema") == 0) {
 653                 const struct ldb_val *rdn_value;
 654                 rdn_value = ldb_dn_get_rdn_val(ac->msg->dn);
 655                 if (rdn_value == NULL) {
 656                         return ldb_operr(ldb);
 657                 }
 658                 if (!ldb_msg_find_element(ac->msg, "lDAPDisplayName")) {
 659                         /* the RDN has prefix "CN" */
 660                         ret = ldb_msg_add_string(ac->msg, "lDAPDisplayName",
 661                                 samdb_cn_to_lDAPDisplayName(ac->msg,
 662                                                             (const char *) rdn_value->data));
 663                         if (ret != LDB_SUCCESS) {
 664                                 ldb_oom(ldb);
 665                                 return ret;
 666                         }
 667                 }
 668
 669                 /* do not allow to mark an attributeSchema as RODC filtered if it
 670                  * is system-critical */
 671                 if (check_rodc_critical_attribute(ac->msg)) {
 672                         ldb_asprintf_errstring(ldb,
 673                                                "samldb: refusing schema add of %s - cannot combine critical attribute with RODC filtering",
 674                                                ldb_dn_get_linearized(ac->msg->dn));
 675                         return LDB_ERR_UNWILLING_TO_PERFORM;
 676                 }
 677
 678                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 679                                                   "isSingleValued", "FALSE");
 680                 if (ret != LDB_SUCCESS) return ret;
 681
 682                 if (!ldb_msg_find_element(ac->msg, "schemaIDGUID")) {
 683                         struct GUID guid;
 684                         /* a new GUID */
 685                         guid = GUID_random();
 686                         ret = dsdb_msg_add_guid(ac->msg, &guid, "schemaIDGUID");
 687                         if (ret != LDB_SUCCESS) {
 688                                 ldb_oom(ldb);
 689                                 return ret;
 690                         }
 691                 }
 692
 693                 /* handle msDS-IntID attribute */
 694                 ret = samldb_add_handle_msDS_IntId(ac);
 695                 if (ret != LDB_SUCCESS) return ret;
 696
 697                 ret = samldb_add_step(ac, samldb_add_entry);
 698                 if (ret != LDB_SUCCESS) return ret;
 699
 700         } else {
 701                 ldb_asprintf_errstring(ldb,
 702                         "Invalid entry type!");
 703                 return LDB_ERR_OPERATIONS_ERROR;
 704         }
 705
 706         return samldb_first_step(ac);
 707 }
 708
 709 static int samldb_fill_foreignSecurityPrincipal_object(struct samldb_ctx *ac)
 710 {
 711         struct ldb_context *ldb;
 712         const struct ldb_val *rdn_value;
 713         struct dom_sid *sid;
 714         int ret;
 715
 716         ldb = ldb_module_get_ctx(ac->module);
 717
 718         sid = samdb_result_dom_sid(ac->msg, ac->msg, "objectSid");
 719         if (sid == NULL) {
 720                 rdn_value = ldb_dn_get_rdn_val(ac->msg->dn);
 721                 if (rdn_value == NULL) {
 722                         return ldb_operr(ldb);
 723                 }
 724                 sid = dom_sid_parse_talloc(ac->msg,
 725                                            (const char *)rdn_value->data);
 726                 if (sid == NULL) {
 727                         ldb_set_errstring(ldb,
 728                                           "samldb: No valid SID found in ForeignSecurityPrincipal CN!");
 729                         return LDB_ERR_CONSTRAINT_VIOLATION;
 730                 }
 731                 if (! samldb_msg_add_sid(ac->msg, "objectSid", sid)) {
 732                         return ldb_operr(ldb);
 733                 }
 734         }
 735
 736         /* finally proceed with adding the entry */
 737         ret = samldb_add_step(ac, samldb_add_entry);
 738         if (ret != LDB_SUCCESS) return ret;
 739
 740         return samldb_first_step(ac);
 741 }
 742
 743 static int samldb_schema_info_update(struct samldb_ctx *ac)
 744 {
 745         int ret;
 746         struct ldb_context *ldb;
 747         struct dsdb_schema *schema;
 748
 749         /* replicated update should always go through */
 750         if (ldb_request_get_control(ac->req,
 751                                     DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
 752                 return LDB_SUCCESS;
 753         }
 754
 755         /* do not update schemaInfo during provisioning */
 756         if (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
 757                 return LDB_SUCCESS;
 758         }
 759
 760         ldb = ldb_module_get_ctx(ac->module);
 761         schema = dsdb_get_schema(ldb, NULL);
 762         if (!schema) {
 763                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 764                               "samldb_schema_info_update: no dsdb_schema loaded");
 765                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 766                 return ldb_operr(ldb);
 767         }
 768
 769         ret = dsdb_module_schema_info_update(ac->module, schema,
 770                                              DSDB_FLAG_NEXT_MODULE);
 771         if (ret != LDB_SUCCESS) {
 772                 ldb_asprintf_errstring(ldb,
 773                                        "samldb_schema_info_update: dsdb_module_schema_info_update failed with %s",
 774                                        ldb_errstring(ldb));
 775                 return ret;
 776         }
 777
 778         return LDB_SUCCESS;
 779 }
 780
 781 /*
 782  * "Objectclass" trigger (MS-SAMR 3.1.1.8.1)
 783  *
 784  * Has to be invoked on "add" and "modify" operations on "user", "computer" and
 785  * "group" objects.
 786  * ac->msg contains the "add"/"modify" message
 787  * ac->type contains the object type (main objectclass)
 788  */
 789 static int samldb_objectclass_trigger(struct samldb_ctx *ac)
 790 {
 791         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 792         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb,
 793                                          "loadparm"), struct loadparm_context);
 794         struct ldb_message_element *el, *el2;
 795         enum sid_generator sid_generator;
 796         struct dom_sid *sid;
 797         const char *tempstr;
 798         int ret;
 799
 800         /* make sure that "sAMAccountType" is not specified */
 801         el = ldb_msg_find_element(ac->msg, "sAMAccountType");
 802         if (el != NULL) {
 803                 ldb_set_errstring(ldb,
 804                                   "samldb: sAMAccountType must not be specified!");
 805                 return LDB_ERR_UNWILLING_TO_PERFORM;
 806         }
 807
 808         /* Step 1: objectSid assignment */
 809
 810         /* Don't allow the objectSid to be changed. But beside the RELAX
 811          * control we have also to guarantee that it can always be set with
 812          * SYSTEM permissions. This is needed for the "samba3sam" backend. */
 813         sid = samdb_result_dom_sid(ac, ac->msg, "objectSid");
 814         if ((sid != NULL) && (!dsdb_module_am_system(ac->module)) &&
 815             (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID) == NULL)) {
 816                 ldb_set_errstring(ldb,
 817                                   "samldb: objectSid must not be specified!");
 818                 return LDB_ERR_UNWILLING_TO_PERFORM;
 819         }
 820
 821         /* but generate a new SID when we do have an add operations */
 822         if ((sid == NULL) && (ac->req->operation == LDB_ADD)) {
 823                 sid_generator = lpcfg_sid_generator(lp_ctx);
 824                 if (sid_generator == SID_GENERATOR_INTERNAL) {
 825                         ret = samldb_add_step(ac, samldb_allocate_sid);
 826                         if (ret != LDB_SUCCESS) return ret;
 827                 }
 828         }
 829
 830         if (strcmp(ac->type, "user") == 0) {
 831                 /* Step 1.2: Default values */
 832                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 833                         "accountExpires", "9223372036854775807");
 834                 if (ret != LDB_SUCCESS) return ret;
 835                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 836                         "badPasswordTime", "0");
 837                 if (ret != LDB_SUCCESS) return ret;
 838                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 839                         "badPwdCount", "0");
 840                 if (ret != LDB_SUCCESS) return ret;
 841                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 842                         "codePage", "0");
 843                 if (ret != LDB_SUCCESS) return ret;
 844                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 845                         "countryCode", "0");
 846                 if (ret != LDB_SUCCESS) return ret;
 847                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 848                         "lastLogoff", "0");
 849                 if (ret != LDB_SUCCESS) return ret;
 850                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 851                         "lastLogon", "0");
 852                 if (ret != LDB_SUCCESS) return ret;
 853                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 854                         "logonCount", "0");
 855                 if (ret != LDB_SUCCESS) return ret;
 856                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 857                         "pwdLastSet", "0");
 858                 if (ret != LDB_SUCCESS) return ret;
 859
 860                 tempstr = talloc_asprintf(ac->msg, "%d", UF_NORMAL_ACCOUNT);
 861                 if (tempstr == NULL) return ldb_operr(ldb);
 862                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 863                         "userAccountControl", tempstr);
 864                 if (ret != LDB_SUCCESS) return ret;
 865
 866                 el = ldb_msg_find_element(ac->msg, "userAccountControl");
 867                 if (el != NULL) {
 868                         uint32_t user_account_control, account_type;
 869
 870                         /* Step 1.3: "userAccountControl" -> "sAMAccountType" mapping */
 871                         user_account_control = ldb_msg_find_attr_as_uint(ac->msg,
 872                                                                          "userAccountControl",
 873                                                                          0);
 874
 875                         /* Temporary duplicate accounts aren't allowed */
 876                         if ((user_account_control & UF_TEMP_DUPLICATE_ACCOUNT) != 0) {
 877                                 return LDB_ERR_OTHER;
 878                         }
 879
 880                         account_type = ds_uf2atype(user_account_control);
 881                         if (account_type == 0) {
 882                                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
 883                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 884                         }
 885                         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
 886                                                  "sAMAccountType",
 887                                                  account_type);
 888                         if (ret != LDB_SUCCESS) {
 889                                 return ret;
 890                         }
 891                         el2 = ldb_msg_find_element(ac->msg, "sAMAccountType");
 892                         el2->flags = LDB_FLAG_MOD_REPLACE;
 893
 894                         if (user_account_control &
 895                             (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
 896                                 ret = samdb_msg_set_string(ldb, ac->msg, ac->msg,
 897                                                            "isCriticalSystemObject",
 898                                                            "TRUE");
 899                                 if (ret != LDB_SUCCESS) {
 900                                         return ret;
 901                                 }
 902                                 el2 = ldb_msg_find_element(ac->msg,
 903                                                            "isCriticalSystemObject");
 904                                 el2->flags = LDB_FLAG_MOD_REPLACE;
 905                         }
 906
 907                         /* Step 1.4: "userAccountControl" -> "primaryGroupID" mapping */
 908                         if (!ldb_msg_find_element(ac->msg, "primaryGroupID")) {
 909                                 uint32_t rid = ds_uf2prim_group_rid(user_account_control);
 910                                 ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
 911                                                          "primaryGroupID", rid);
 912                                 if (ret != LDB_SUCCESS) {
 913                                         return ret;
 914                                 }
 915                                 el2 = ldb_msg_find_element(ac->msg,
 916                                                            "primaryGroupID");
 917                                 el2->flags = LDB_FLAG_MOD_REPLACE;
 918                         }
 919
 920                         /* Step 1.5: Add additional flags when needed */
 921                         if ((user_account_control & UF_NORMAL_ACCOUNT) &&
 922                             (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID) == NULL)) {
 923                                 user_account_control |= UF_ACCOUNTDISABLE;
 924                                 user_account_control |= UF_PASSWD_NOTREQD;
 925
 926                                 ret = samdb_msg_set_uint(ldb, ac->msg, ac->msg,
 927                                                          "userAccountControl",
 928                                                          user_account_control);
 929                                 if (ret != LDB_SUCCESS) {
 930                                         return ret;
 931                                 }
 932                         }
 933                 }
 934
 935         } else if (strcmp(ac->type, "group") == 0) {
 936                 /* Step 2.2: Default values */
 937                 tempstr = talloc_asprintf(ac->msg, "%d",
 938                                           GTYPE_SECURITY_GLOBAL_GROUP);
 939                 if (tempstr == NULL) return ldb_operr(ldb);
 940                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 941                         "groupType", tempstr);
 942                 if (ret != LDB_SUCCESS) return ret;
 943
 944                 /* Step 2.3: "groupType" -> "sAMAccountType" */
 945                 el = ldb_msg_find_element(ac->msg, "groupType");
 946                 if (el != NULL) {
 947                         uint32_t group_type, account_type;
 948
 949                         group_type = ldb_msg_find_attr_as_uint(ac->msg,
 950                                                                "groupType", 0);
 951
 952                         /* The creation of builtin groups requires the
 953                          * RELAX control */
 954                         if (group_type == GTYPE_SECURITY_BUILTIN_LOCAL_GROUP) {
 955                                 if (ldb_request_get_control(ac->req,
 956                                                             LDB_CONTROL_RELAX_OID) == NULL) {
 957                                         return LDB_ERR_UNWILLING_TO_PERFORM;
 958                                 }
 959                         }
 960
 961                         account_type = ds_gtype2atype(group_type);
 962                         if (account_type == 0) {
 963                                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
 964                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 965                         }
 966                         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
 967                                                  "sAMAccountType",
 968                                                  account_type);
 969                         if (ret != LDB_SUCCESS) {
 970                                 return ret;
 971                         }
 972                         el2 = ldb_msg_find_element(ac->msg, "sAMAccountType");
 973                         el2->flags = LDB_FLAG_MOD_REPLACE;
 974                 }
 975         }
 976
 977         return LDB_SUCCESS;
 978 }
 979
 980 /*
 981  * "Primary group ID" trigger (MS-SAMR 3.1.1.8.2)
 982  *
 983  * Has to be invoked on "add" and "modify" operations on "user" and "computer"
 984  * objects.
 985  * ac->msg contains the "add"/"modify" message
 986  */
 987
 988 static int samldb_prim_group_set(struct samldb_ctx *ac)
 989 {
 990         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 991         struct ldb_dn *prim_group_dn;
 992         uint32_t rid;
 993         struct dom_sid *sid;
 994
 995         rid = ldb_msg_find_attr_as_uint(ac->msg, "primaryGroupID", (uint32_t) -1);
 996         if (rid == (uint32_t) -1) {
 997                 /* we aren't affected of any primary group set */
 998                 return LDB_SUCCESS;
 999
1000         } else if (!ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
1001                 ldb_set_errstring(ldb,
1002                                   "The primary group isn't settable on add operations!");
1003                 return LDB_ERR_UNWILLING_TO_PERFORM;
1004         }
1005
1006         sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), rid);
1007         if (sid == NULL) {
1008                 return ldb_operr(ldb);
1009         }
1010
1011         prim_group_dn = samdb_search_dn(ldb, ac, NULL, "(objectSid=%s)",
1012                                         ldap_encode_ndr_dom_sid(ac, sid));
1013         if (prim_group_dn == NULL) {
1014                 ldb_asprintf_errstring(ldb,
1015                                        "Failed to find primary group with RID %u!",
1016                                        rid);
1017                 return LDB_ERR_UNWILLING_TO_PERFORM;
1018         }
1019
1020         return LDB_SUCCESS;
1021 }
1022
1023 static int samldb_prim_group_change(struct samldb_ctx *ac)
1024 {
1025         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1026         const char * attrs[] = { "primaryGroupID", "memberOf", NULL };
1027         struct ldb_result *res;
1028         struct ldb_message_element *el;
1029         struct ldb_message *msg;
1030         uint32_t prev_rid, new_rid;
1031         struct dom_sid *prev_sid, *new_sid;
1032         struct ldb_dn *prev_prim_group_dn, *new_prim_group_dn;
1033         int ret;
1034
1035         el = dsdb_get_single_valued_attr(ac->msg, "primaryGroupID",
1036                                          ac->req->operation);
1037         if (el == NULL) {
1038                 /* we are not affected */
1039                 return LDB_SUCCESS;
1040         }
1041
1042         /* Fetch informations from the existing object */
1043
1044         ret = ldb_search(ldb, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1045                          NULL);
1046         if (ret != LDB_SUCCESS) {
1047                 return ret;
1048         }
1049         if (res->count != 1) {
1050                 return ldb_operr(ldb);
1051         }
1052
1053         /* Finds out the DN of the old primary group */
1054
1055         prev_rid = ldb_msg_find_attr_as_uint(res->msgs[0], "primaryGroupID",
1056                                              (uint32_t) -1);
1057         if (prev_rid == (uint32_t) -1) {
1058                 /* User objects do always have a mandatory "primaryGroupID"
1059                  * attribute. If this doesn't exist then the object is of the
1060                  * wrong type. This is the exact Windows error code */
1061                 return LDB_ERR_OBJECT_CLASS_VIOLATION;
1062         }
1063
1064         prev_sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), prev_rid);
1065         if (prev_sid == NULL) {
1066                 return ldb_operr(ldb);
1067         }
1068
1069         /* Finds out the DN of the new primary group
1070          * Notice: in order to parse the primary group ID correctly we create
1071          * a temporary message here. */
1072
1073         msg = ldb_msg_new(ac->msg);
1074         if (msg == NULL) {
1075                 return ldb_module_oom(ac->module);
1076         }
1077         ret = ldb_msg_add(msg, el, 0);
1078         if (ret != LDB_SUCCESS) {
1079                 return ret;
1080         }
1081         new_rid = ldb_msg_find_attr_as_uint(msg, "primaryGroupID", (uint32_t) -1);
1082         talloc_free(msg);
1083         if (new_rid == (uint32_t) -1) {
1084                 /* we aren't affected of any primary group change */
1085                 return LDB_SUCCESS;
1086         }
1087
1088         if (prev_rid == new_rid) {
1089                 return LDB_SUCCESS;
1090         }
1091
1092         prev_prim_group_dn = samdb_search_dn(ldb, ac, NULL, "(objectSid=%s)",
1093                                              ldap_encode_ndr_dom_sid(ac, prev_sid));
1094         if (prev_prim_group_dn == NULL) {
1095                 return ldb_operr(ldb);
1096         }
1097
1098         new_sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), new_rid);
1099         if (new_sid == NULL) {
1100                 return ldb_operr(ldb);
1101         }
1102
1103         new_prim_group_dn = samdb_search_dn(ldb, ac, NULL, "(objectSid=%s)",
1104                                             ldap_encode_ndr_dom_sid(ac, new_sid));
1105         if (new_prim_group_dn == NULL) {
1106                 /* Here we know if the specified new primary group candidate is
1107                  * valid or not. */
1108                 return LDB_ERR_UNWILLING_TO_PERFORM;
1109         }
1110
1111         /* We need to be already a normal member of the new primary
1112          * group in order to be successful. */
1113         el = samdb_find_attribute(ldb, res->msgs[0], "memberOf",
1114                                   ldb_dn_get_linearized(new_prim_group_dn));
1115         if (el == NULL) {
1116                 return LDB_ERR_UNWILLING_TO_PERFORM;
1117         }
1118
1119         /* Remove the "member" attribute on the new primary group */
1120         msg = ldb_msg_new(ac->msg);
1121         if (msg == NULL) {
1122                 return ldb_module_oom(ac->module);
1123         }
1124         msg->dn = new_prim_group_dn;
1125
1126         ret = samdb_msg_add_delval(ldb, msg, msg, "member",
1127                                    ldb_dn_get_linearized(ac->msg->dn));
1128         if (ret != LDB_SUCCESS) {
1129                 return ret;
1130         }
1131
1132         ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE);
1133         if (ret != LDB_SUCCESS) {
1134                 return ret;
1135         }
1136         talloc_free(msg);
1137
1138         /* Add a "member" attribute for the previous primary group */
1139         msg = ldb_msg_new(ac->msg);
1140         if (msg == NULL) {
1141                 return ldb_module_oom(ac->module);
1142         }
1143         msg->dn = prev_prim_group_dn;
1144
1145         ret = samdb_msg_add_addval(ldb, msg, msg, "member",
1146                                    ldb_dn_get_linearized(ac->msg->dn));
1147         if (ret != LDB_SUCCESS) {
1148                 return ret;
1149         }
1150
1151         ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE);
1152         if (ret != LDB_SUCCESS) {
1153                 return ret;
1154         }
1155         talloc_free(msg);
1156
1157         return LDB_SUCCESS;
1158 }
1159
1160 static int samldb_prim_group_trigger(struct samldb_ctx *ac)
1161 {
1162         int ret;
1163
1164         if (ac->req->operation == LDB_ADD) {
1165                 ret = samldb_prim_group_set(ac);
1166         } else {
1167                 ret = samldb_prim_group_change(ac);
1168         }
1169
1170         return ret;
1171 }
1172
1173 static int samldb_user_account_control_change(struct samldb_ctx *ac)
1174 {
1175         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1176         uint32_t user_account_control, account_type;
1177         struct ldb_message_element *el;
1178         struct ldb_message *tmp_msg;
1179         int ret;
1180
1181         el = dsdb_get_single_valued_attr(ac->msg, "userAccountControl",
1182                                          ac->req->operation);
1183         if (el == NULL) {
1184                 /* we are not affected */
1185                 return LDB_SUCCESS;
1186         }
1187
1188         /* Create a temporary message for fetching the "userAccountControl" */
1189         tmp_msg = ldb_msg_new(ac->msg);
1190         if (tmp_msg == NULL) {
1191                 return ldb_module_oom(ac->module);
1192         }
1193         ret = ldb_msg_add(tmp_msg, el, 0);
1194         if (ret != LDB_SUCCESS) {
1195                 return ret;
1196         }
1197         user_account_control = ldb_msg_find_attr_as_uint(tmp_msg,
1198                                                          "userAccountControl",
1199                                                          0);
1200         talloc_free(tmp_msg);
1201
1202         /* Temporary duplicate accounts aren't allowed */
1203         if ((user_account_control & UF_TEMP_DUPLICATE_ACCOUNT) != 0) {
1204                 return LDB_ERR_OTHER;
1205         }
1206
1207         account_type = ds_uf2atype(user_account_control);
1208         if (account_type == 0) {
1209                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
1210                 return LDB_ERR_UNWILLING_TO_PERFORM;
1211         }
1212         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "sAMAccountType",
1213                                  account_type);
1214         if (ret != LDB_SUCCESS) {
1215                 return ret;
1216         }
1217         el = ldb_msg_find_element(ac->msg, "sAMAccountType");
1218         el->flags = LDB_FLAG_MOD_REPLACE;
1219
1220         if (user_account_control
1221             & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
1222                 ret = samdb_msg_add_string(ldb, ac->msg, ac->msg,
1223                                            "isCriticalSystemObject", "TRUE");
1224                 if (ret != LDB_SUCCESS) {
1225                         return ret;
1226                 }
1227                 el = ldb_msg_find_element(ac->msg,
1228                                            "isCriticalSystemObject");
1229                 el->flags = LDB_FLAG_MOD_REPLACE;
1230         }
1231
1232         if (!ldb_msg_find_element(ac->msg, "primaryGroupID")) {
1233                 uint32_t rid = ds_uf2prim_group_rid(user_account_control);
1234                 ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
1235                                          "primaryGroupID", rid);
1236                 if (ret != LDB_SUCCESS) {
1237                         return ret;
1238                 }
1239                 el = ldb_msg_find_element(ac->msg,
1240                                            "primaryGroupID");
1241                 el->flags = LDB_FLAG_MOD_REPLACE;
1242         }
1243
1244         return LDB_SUCCESS;
1245 }
1246
1247 static int samldb_group_type_change(struct samldb_ctx *ac)
1248 {
1249         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1250         uint32_t group_type, old_group_type, account_type;
1251         struct ldb_message_element *el;
1252         struct ldb_message *tmp_msg;
1253         int ret;
1254
1255         el = dsdb_get_single_valued_attr(ac->msg, "groupType",
1256                                          ac->req->operation);
1257         if (el == NULL) {
1258                 /* we are not affected */
1259                 return LDB_SUCCESS;
1260         }
1261
1262         /* Create a temporary message for fetching the "groupType" */
1263         tmp_msg = ldb_msg_new(ac->msg);
1264         if (tmp_msg == NULL) {
1265                 return ldb_module_oom(ac->module);
1266         }
1267         ret = ldb_msg_add(tmp_msg, el, 0);
1268         if (ret != LDB_SUCCESS) {
1269                 return ret;
1270         }
1271         group_type = ldb_msg_find_attr_as_uint(tmp_msg, "groupType", 0);
1272         talloc_free(tmp_msg);
1273
1274         old_group_type = samdb_search_uint(ldb, ac, 0, ac->msg->dn,
1275                                            "groupType", NULL);
1276         if (old_group_type == 0) {
1277                 return ldb_operr(ldb);
1278         }
1279
1280         /* Group type switching isn't so easy as it seems: We can only
1281          * change in this directions: global <-> universal <-> local
1282          * On each step also the group type itself
1283          * (security/distribution) is variable. */
1284
1285         if (ldb_request_get_control(ac->req, LDB_CONTROL_PROVISION_OID) == NULL) {
1286                 switch (group_type) {
1287                 case GTYPE_SECURITY_GLOBAL_GROUP:
1288                 case GTYPE_DISTRIBUTION_GLOBAL_GROUP:
1289                         /* change to "universal" allowed */
1290                         if ((old_group_type == GTYPE_SECURITY_DOMAIN_LOCAL_GROUP) ||
1291                         (old_group_type == GTYPE_DISTRIBUTION_DOMAIN_LOCAL_GROUP)) {
1292                                 ldb_set_errstring(ldb,
1293                                         "samldb: Change from security/distribution local group forbidden!");
1294                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1295                         }
1296                 break;
1297
1298                 case GTYPE_SECURITY_UNIVERSAL_GROUP:
1299                 case GTYPE_DISTRIBUTION_UNIVERSAL_GROUP:
1300                         /* each change allowed */
1301                 break;
1302                 case GTYPE_SECURITY_DOMAIN_LOCAL_GROUP:
1303                 case GTYPE_DISTRIBUTION_DOMAIN_LOCAL_GROUP:
1304                         /* change to "universal" allowed */
1305                         if ((old_group_type == GTYPE_SECURITY_GLOBAL_GROUP) ||
1306                         (old_group_type == GTYPE_DISTRIBUTION_GLOBAL_GROUP)) {
1307                                 ldb_set_errstring(ldb,
1308                                         "samldb: Change from security/distribution global group forbidden!");
1309                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1310                         }
1311                 break;
1312
1313                 case GTYPE_SECURITY_BUILTIN_LOCAL_GROUP:
1314                 default:
1315                         /* we don't allow this "groupType" values */
1316                         return LDB_ERR_UNWILLING_TO_PERFORM;
1317                 break;
1318                 }
1319         }
1320
1321         account_type =  ds_gtype2atype(group_type);
1322         if (account_type == 0) {
1323                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
1324                 return LDB_ERR_UNWILLING_TO_PERFORM;
1325         }
1326         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "sAMAccountType",
1327                                  account_type);
1328         if (ret != LDB_SUCCESS) {
1329                 return ret;
1330         }
1331         el = ldb_msg_find_element(ac->msg, "sAMAccountType");
1332         el->flags = LDB_FLAG_MOD_REPLACE;
1333
1334         return LDB_SUCCESS;
1335 }
1336
1337 static int samldb_sam_accountname_check(struct samldb_ctx *ac)
1338 {
1339         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1340         const char *no_attrs[] = { NULL };
1341         struct ldb_result *res;
1342         const char *sam_accountname, *enc_str;
1343         struct ldb_message_element *el;
1344         struct ldb_message *tmp_msg;
1345         int ret;
1346
1347         el = dsdb_get_single_valued_attr(ac->msg, "sAMAccountName",
1348                                          ac->req->operation);
1349         if (el == NULL) {
1350                 /* we are not affected */
1351                 return LDB_SUCCESS;
1352         }
1353
1354         /* Create a temporary message for fetching the "sAMAccountName" */
1355         tmp_msg = ldb_msg_new(ac->msg);
1356         if (tmp_msg == NULL) {
1357                 return ldb_module_oom(ac->module);
1358         }
1359         ret = ldb_msg_add(tmp_msg, el, 0);
1360         if (ret != LDB_SUCCESS) {
1361                 return ret;
1362         }
1363         sam_accountname = talloc_steal(ac,
1364                                        ldb_msg_find_attr_as_string(tmp_msg, "sAMAccountName", NULL));
1365         talloc_free(tmp_msg);
1366
1367         if (sam_accountname == NULL) {
1368                 /* The "sAMAccountName" cannot be nothing */
1369                 ldb_set_errstring(ldb,
1370                                   "samldb: Empty account names aren't allowed!");
1371                 return LDB_ERR_UNWILLING_TO_PERFORM;
1372         }
1373
1374         enc_str = ldb_binary_encode_string(ac, sam_accountname);
1375         if (enc_str == NULL) {
1376                 return ldb_module_oom(ac->module);
1377         }
1378
1379         /* Make sure that a "sAMAccountName" is only used once */
1380
1381         ret = ldb_search(ldb, ac, &res, NULL, LDB_SCOPE_SUBTREE, no_attrs,
1382                          "(sAMAccountName=%s)", enc_str);
1383         if (ret != LDB_SUCCESS) {
1384                 return ret;
1385         }
1386         if (res->count > 1) {
1387                 return ldb_operr(ldb);
1388         } else if (res->count == 1) {
1389                 if (ldb_dn_compare(res->msgs[0]->dn, ac->msg->dn) != 0) {
1390                         ldb_asprintf_errstring(ldb,
1391                                                "samldb: Account name (sAMAccountName) '%s' already in use!",
1392                                                sam_accountname);
1393                         return LDB_ERR_ENTRY_ALREADY_EXISTS;
1394                 }
1395         }
1396         talloc_free(res);
1397
1398         return LDB_SUCCESS;
1399 }
1400
1401 static int samldb_member_check(struct samldb_ctx *ac)
1402 {
1403         static const char * const attrs[] = { "objectSid", "member", NULL };
1404         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1405         struct ldb_message_element *el;
1406         struct ldb_dn *member_dn;
1407         struct dom_sid *sid;
1408         struct ldb_result *res;
1409         struct dom_sid *group_sid;
1410         unsigned int i, j;
1411         int cnt;
1412         int ret;
1413
1414         /* Fetch informations from the existing object */
1415
1416         ret = ldb_search(ldb, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1417                          NULL);
1418         if (ret != LDB_SUCCESS) {
1419                 return ret;
1420         }
1421         if (res->count != 1) {
1422                 return ldb_operr(ldb);
1423         }
1424
1425         group_sid = samdb_result_dom_sid(res, res->msgs[0], "objectSid");
1426         if (group_sid == NULL) {
1427                 return ldb_operr(ldb);
1428         }
1429
1430         /* We've to walk over all modification entries and consider the "member"
1431          * ones. */
1432         for (i = 0; i < ac->msg->num_elements; i++) {
1433                 if (ldb_attr_cmp(ac->msg->elements[i].name, "member") != 0) {
1434                         continue;
1435                 }
1436
1437                 el = &ac->msg->elements[i];
1438                 for (j = 0; j < el->num_values; j++) {
1439                         struct ldb_message_element *mo;
1440                         struct ldb_result *group_res;
1441                         const char *group_attrs[] = { "primaryGroupID" , NULL };
1442                         uint32_t prim_group_rid;
1443
1444                         member_dn = ldb_dn_from_ldb_val(ac, ldb,
1445                                                         &el->values[j]);
1446                         if (!ldb_dn_validate(member_dn)) {
1447                                 return ldb_operr(ldb);
1448                         }
1449
1450                         /* The "member" attribute can be modified with the
1451                          * following restrictions (beside a valid DN):
1452                          *
1453                          * - "add" operations can only be performed when the
1454                          *   member still doesn't exist - if not then return
1455                          *   ERR_ENTRY_ALREADY_EXISTS (not
1456                          *   ERR_ATTRIBUTE_OR_VALUE_EXISTS!)
1457                          * - "delete" operations can only be performed when the
1458                          *   member does exist - if not then return
1459                          *   ERR_UNWILLING_TO_PERFORM (not
1460                          *   ERR_NO_SUCH_ATTRIBUTE!)
1461                          * - primary group check
1462                          */
1463                         mo = samdb_find_attribute(ldb, res->msgs[0], "member",
1464                                                   ldb_dn_get_linearized(member_dn));
1465                         if (mo == NULL) {
1466                                 cnt = 0;
1467                         } else {
1468                                 cnt = 1;
1469                         }
1470
1471                         if ((cnt > 0) && (LDB_FLAG_MOD_TYPE(el->flags)
1472                             == LDB_FLAG_MOD_ADD)) {
1473                                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
1474                         }
1475                         if ((cnt == 0) && LDB_FLAG_MOD_TYPE(el->flags)
1476                             == LDB_FLAG_MOD_DELETE) {
1477                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1478                         }
1479
1480                         /* Denies to add "member"s to groups which are primary
1481                          * ones for them - in this case return
1482                          * ERR_ENTRY_ALREADY_EXISTS. */
1483
1484                         ret = dsdb_module_search_dn(ac->module, ac, &group_res,
1485                                                     member_dn, group_attrs,
1486                                                     DSDB_FLAG_NEXT_MODULE);
1487                         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1488                                 /* member DN doesn't exist yet */
1489                                 continue;
1490                         }
1491                         if (ret != LDB_SUCCESS) {
1492                                 return ret;
1493                         }
1494                         prim_group_rid = ldb_msg_find_attr_as_uint(group_res->msgs[0], "primaryGroupID", (uint32_t)-1);
1495                         if (prim_group_rid == (uint32_t) -1) {
1496                                 /* the member hasn't to be a user account ->
1497                                  * therefore no check needed in this case. */
1498                                 continue;
1499                         }
1500
1501                         sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb),
1502                                               prim_group_rid);
1503                         if (sid == NULL) {
1504                                 return ldb_operr(ldb);
1505                         }
1506
1507                         if (dom_sid_equal(group_sid, sid)) {
1508                                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
1509                         }
1510                 }
1511         }
1512
1513         talloc_free(res);
1514
1515         return LDB_SUCCESS;
1516 }
1517
1518 /* SAM objects have special rules regarding the "description" attribute on
1519  * modify operations. */
1520 static int samldb_description_check(struct samldb_ctx *ac)
1521 {
1522         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1523         const char * const attrs[] = { "objectClass", "description", NULL };
1524         struct ldb_message_element *el;
1525         struct ldb_result *res;
1526         unsigned int i;
1527         int ret;
1528
1529         /* Fetch informations from the existing object */
1530
1531         ret = ldb_search(ldb, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1532                          NULL);
1533         if (ret != LDB_SUCCESS) {
1534                 return ret;
1535         }
1536         if (res->count != 1) {
1537                 return ldb_operr(ldb);
1538         }
1539
1540         /* if it's not a SAM object then please skip the constraints */
1541         if ((samdb_find_attribute(ldb, res->msgs[0], "objectClass",
1542                                   "group") == NULL) &&
1543             (samdb_find_attribute(ldb, res->msgs[0], "objectClass",
1544                                   "samDomain") == NULL) &&
1545             (samdb_find_attribute(ldb, res->msgs[0], "objectClass",
1546                                   "samServer") == NULL) &&
1547             (samdb_find_attribute(ldb, res->msgs[0], "objectClass",
1548                                   "user") == NULL)) {
1549                 talloc_free(res);
1550                 return LDB_SUCCESS;
1551         }
1552
1553         /* We've to walk over all modification entries and consider the
1554          * "description" ones. */
1555         for (i = 0; i < ac->msg->num_elements; i++) {
1556                 if (ldb_attr_cmp(ac->msg->elements[i].name,
1557                                  "description") != 0) {
1558                         continue;
1559                 }
1560
1561                 el = &ac->msg->elements[i];
1562
1563                 /* Multi-valued add or replace operations are always denied */
1564                 if ((LDB_FLAG_MOD_TYPE(el->flags) != LDB_FLAG_MOD_DELETE) &&
1565                     (el->num_values > 1)) {
1566                         ldb_asprintf_errstring(ldb,
1567                                                "samldb: Description on SAM entry '%s' is changed using a multi-valued add or replace operation!",
1568                                                ldb_dn_get_linearized(ac->msg->dn));
1569                         return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1570                 }
1571
1572                 /* Add operations are only allowed if no value exists */
1573                 if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
1574                         if (ldb_msg_find_element(res->msgs[0], "description")
1575                                                                 != NULL) {
1576                                 ldb_asprintf_errstring(ldb,
1577                                                        "samldb: Description on SAM entry '%s' is changed using an add operation while a value already exists!",
1578                                                        ldb_dn_get_linearized(ac->msg->dn));
1579                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1580                         }
1581                 }
1582         }
1583
1584         talloc_free(res);
1585
1586         return LDB_SUCCESS;
1587 }
1588
1589 /* This trigger adapts the "servicePrincipalName" attributes if the
1590  * "dNSHostName" and/or "sAMAccountName" attribute change(s) */
1591 static int samldb_service_principal_names_change(struct samldb_ctx *ac)
1592 {
1593         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1594         struct ldb_message_element *el = NULL, *el2 = NULL;
1595         struct ldb_message *msg;
1596         const char *attrs[] = { "servicePrincipalName", NULL };
1597         struct ldb_result *res;
1598         const char *dns_hostname = NULL, *old_dns_hostname = NULL,
1599                    *sam_accountname = NULL, *old_sam_accountname = NULL;
1600         unsigned int i;
1601         int ret;
1602
1603         el = dsdb_get_single_valued_attr(ac->msg, "dNSHostName",
1604                                          ac->req->operation);
1605         el2 = dsdb_get_single_valued_attr(ac->msg, "sAMAccountName",
1606                                           ac->req->operation);
1607         if ((el == NULL) && (el2 == NULL)) {
1608                 /* we are not affected */
1609                 return LDB_SUCCESS;
1610         }
1611
1612         /* Create a temporary message for fetching the "dNSHostName" */
1613         if (el != NULL) {
1614                 msg = ldb_msg_new(ac->msg);
1615                 if (msg == NULL) {
1616                         return ldb_module_oom(ac->module);
1617                 }
1618                 ret = ldb_msg_add(msg, el, 0);
1619                 if (ret != LDB_SUCCESS) {
1620                         return ret;
1621                 }
1622                 dns_hostname = talloc_steal(ac,
1623                                             ldb_msg_find_attr_as_string(msg, "dNSHostName", NULL));
1624                 talloc_free(msg);
1625
1626                 old_dns_hostname = samdb_search_string(ldb, ac, ac->msg->dn,
1627                                                        "dNSHostName", NULL);
1628         }
1629
1630         /* Create a temporary message for fetching the "sAMAccountName" */
1631         if (el2 != NULL) {
1632                 char *tempstr, *tempstr2;
1633
1634                 msg = ldb_msg_new(ac->msg);
1635                 if (msg == NULL) {
1636                         return ldb_module_oom(ac->module);
1637                 }
1638                 ret = ldb_msg_add(msg, el2, 0);
1639                 if (ret != LDB_SUCCESS) {
1640                         return ret;
1641                 }
1642                 tempstr = talloc_strdup(ac,
1643                                         ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL));
1644                 talloc_free(msg);
1645
1646                 tempstr2 = talloc_strdup(ac,
1647                                          samdb_search_string(ldb, ac, ac->msg->dn, "sAMAccountName", NULL));
1648
1649                 /* The "sAMAccountName" needs some additional trimming: we need
1650                  * to remove the trailing "$"s if they exist. */
1651                 if ((tempstr != NULL) && (tempstr[0] != '\0') &&
1652                     (tempstr[strlen(tempstr) - 1] == '$')) {
1653                         tempstr[strlen(tempstr) - 1] = '\0';
1654                 }
1655                 if ((tempstr2 != NULL) && (tempstr2[0] != '\0') &&
1656                     (tempstr2[strlen(tempstr2) - 1] == '$')) {
1657                         tempstr2[strlen(tempstr2) - 1] = '\0';
1658                 }
1659                 sam_accountname = tempstr;
1660                 old_sam_accountname = tempstr2;
1661         }
1662
1663         if (old_dns_hostname == NULL) {
1664                 /* we cannot change when the old name is unknown */
1665                 dns_hostname = NULL;
1666         }
1667         if ((old_dns_hostname != NULL) && (dns_hostname != NULL) &&
1668             (strcasecmp(old_dns_hostname, dns_hostname) == 0)) {
1669                 /* The "dNSHostName" didn't change */
1670                 dns_hostname = NULL;
1671         }
1672
1673         if (old_sam_accountname == NULL) {
1674                 /* we cannot change when the old name is unknown */
1675                 sam_accountname = NULL;
1676         }
1677         if ((old_sam_accountname != NULL) && (sam_accountname != NULL) &&
1678             (strcasecmp(old_sam_accountname, sam_accountname) == 0)) {
1679                 /* The "sAMAccountName" didn't change */
1680                 sam_accountname = NULL;
1681         }
1682
1683         if ((dns_hostname == NULL) && (sam_accountname == NULL)) {
1684                 /* Well, there are informations missing (old name(s)) or the
1685                  * names didn't change. We've nothing to do and can exit here */
1686                 return LDB_SUCCESS;
1687         }
1688
1689         /* Potential "servicePrincipalName" changes in the same request have to
1690          * be handled before the update (Windows behaviour). */
1691         el = ldb_msg_find_element(ac->msg, "servicePrincipalName");
1692         if (el != NULL) {
1693                 msg = ldb_msg_new(ac->msg);
1694                 if (msg == NULL) {
1695                         return ldb_module_oom(ac->module);
1696                 }
1697                 msg->dn = ac->msg->dn;
1698
1699                 do {
1700                         ret = ldb_msg_add(msg, el, el->flags);
1701                         if (ret != LDB_SUCCESS) {
1702                                 return ret;
1703                         }
1704
1705                         ldb_msg_remove_element(ac->msg, el);
1706
1707                         el = ldb_msg_find_element(ac->msg,
1708                                                   "servicePrincipalName");
1709                 } while (el != NULL);
1710
1711                 ret = dsdb_module_modify(ac->module, msg,
1712                                          DSDB_FLAG_NEXT_MODULE);
1713                 if (ret != LDB_SUCCESS) {
1714                         return ret;
1715                 }
1716                 talloc_free(msg);
1717         }
1718
1719         /* Fetch the "servicePrincipalName"s if any */
1720         ret = ldb_search(ldb, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1721                          NULL);
1722         if (ret != LDB_SUCCESS) {
1723                 return ret;
1724         }
1725         if ((res->count != 1) || (res->msgs[0]->num_elements > 1)) {
1726                 return ldb_operr(ldb);
1727         }
1728
1729         if (res->msgs[0]->num_elements == 1) {
1730                 /* Yes, we do have "servicePrincipalName"s. First we update them
1731                  * locally, that means we do always substitute the current
1732                  * "dNSHostName" with the new one and/or "sAMAccountName"
1733                  * without "$" with the new one and then we append this to the
1734                  * modification request (Windows behaviour). */
1735
1736                 for (i = 0; i < res->msgs[0]->elements[0].num_values; i++) {
1737                         char *old_str, *new_str, *pos;
1738                         const char *tok;
1739
1740                         old_str = (char *)
1741                                 res->msgs[0]->elements[0].values[i].data;
1742
1743                         new_str = talloc_strdup(ac->msg,
1744                                                 strtok_r(old_str, "/", &pos));
1745                         if (new_str == NULL) {
1746                                 return ldb_module_oom(ac->module);
1747                         }
1748
1749                         while ((tok = strtok_r(NULL, "/", &pos)) != NULL) {
1750                                 if ((dns_hostname != NULL) &&
1751                                     (strcasecmp(tok, old_dns_hostname) == 0)) {
1752                                         tok = dns_hostname;
1753                                 }
1754                                 if ((sam_accountname != NULL) &&
1755                                     (strcasecmp(tok, old_sam_accountname) == 0)) {
1756                                         tok = sam_accountname;
1757                                 }
1758
1759                                 new_str = talloc_asprintf(ac->msg, "%s/%s",
1760                                                           new_str, tok);
1761                                 if (new_str == NULL) {
1762                                         return ldb_module_oom(ac->module);
1763                                 }
1764                         }
1765
1766                         ret = ldb_msg_add_string(ac->msg,
1767                                                  "servicePrincipalName",
1768                                                  new_str);
1769                         if (ret != LDB_SUCCESS) {
1770                                 return ret;
1771                         }
1772                 }
1773
1774                 el = ldb_msg_find_element(ac->msg, "servicePrincipalName");
1775                 el->flags = LDB_FLAG_MOD_REPLACE;
1776         }
1777
1778         talloc_free(res);
1779
1780         return LDB_SUCCESS;
1781 }
1782
1783
1784 /* add */
1785 static int samldb_add(struct ldb_module *module, struct ldb_request *req)
1786 {
1787         struct ldb_context *ldb;
1788         struct samldb_ctx *ac;
1789         int ret;
1790
1791         ldb = ldb_module_get_ctx(module);
1792         ldb_debug(ldb, LDB_DEBUG_TRACE, "samldb_add\n");
1793
1794         /* do not manipulate our control entries */
1795         if (ldb_dn_is_special(req->op.add.message->dn)) {
1796                 return ldb_next_request(module, req);
1797         }
1798
1799         ac = samldb_ctx_init(module, req);
1800         if (ac == NULL) {
1801                 return ldb_operr(ldb);
1802         }
1803
1804         /* build the new msg */
1805         ac->msg = ldb_msg_copy_shallow(ac, req->op.add.message);
1806         if (ac->msg == NULL) {
1807                 talloc_free(ac);
1808                 ldb_debug(ldb, LDB_DEBUG_FATAL,
1809                           "samldb_add: ldb_msg_copy_shallow failed!\n");
1810                 return ldb_operr(ldb);
1811         }
1812
1813         if (samdb_find_attribute(ldb, ac->msg,
1814                                  "objectclass", "user") != NULL) {
1815                 ac->type = "user";
1816
1817                 ret = samldb_prim_group_trigger(ac);
1818                 if (ret != LDB_SUCCESS) {
1819                         return ret;
1820                 }
1821
1822                 ret = samldb_objectclass_trigger(ac);
1823                 if (ret != LDB_SUCCESS) {
1824                         return ret;
1825                 }
1826
1827                 return samldb_fill_object(ac);
1828         }
1829
1830         if (samdb_find_attribute(ldb, ac->msg,
1831                                  "objectclass", "group") != NULL) {
1832                 ac->type = "group";
1833
1834                 ret = samldb_objectclass_trigger(ac);
1835                 if (ret != LDB_SUCCESS) {
1836                         return ret;
1837                 }
1838
1839                 return samldb_fill_object(ac);
1840         }
1841
1842         /* perhaps a foreignSecurityPrincipal? */
1843         if (samdb_find_attribute(ldb, ac->msg,
1844                                  "objectclass",
1845                                  "foreignSecurityPrincipal") != NULL) {
1846                 return samldb_fill_foreignSecurityPrincipal_object(ac);
1847         }
1848
1849         if (samdb_find_attribute(ldb, ac->msg,
1850                                  "objectclass", "classSchema") != NULL) {
1851                 ret = samldb_schema_info_update(ac);
1852                 if (ret != LDB_SUCCESS) {
1853                         talloc_free(ac);
1854                         return ret;
1855                 }
1856
1857                 ac->type = "classSchema";
1858                 return samldb_fill_object(ac);
1859         }
1860
1861         if (samdb_find_attribute(ldb, ac->msg,
1862                                  "objectclass", "attributeSchema") != NULL) {
1863                 ret = samldb_schema_info_update(ac);
1864                 if (ret != LDB_SUCCESS) {
1865                         talloc_free(ac);
1866                         return ret;
1867                 }
1868
1869                 ac->type = "attributeSchema";
1870                 return samldb_fill_object(ac);
1871         }
1872
1873         talloc_free(ac);
1874
1875         /* nothing matched, go on */
1876         return ldb_next_request(module, req);
1877 }
1878
1879 /* modify */
1880 static int samldb_modify(struct ldb_module *module, struct ldb_request *req)
1881 {
1882         struct ldb_context *ldb;
1883         struct samldb_ctx *ac;
1884         struct ldb_message_element *el, *el2;
1885         bool modified = false;
1886         int ret;
1887
1888         if (ldb_dn_is_special(req->op.mod.message->dn)) {
1889                 /* do not manipulate our control entries */
1890                 return ldb_next_request(module, req);
1891         }
1892
1893         ldb = ldb_module_get_ctx(module);
1894
1895         /* make sure that "objectSid" is not specified */
1896         el = ldb_msg_find_element(req->op.mod.message, "objectSid");
1897         if (el != NULL) {
1898                 ldb_set_errstring(ldb,
1899                                   "samldb: objectSid must not be specified!");
1900                 return LDB_ERR_UNWILLING_TO_PERFORM;
1901         }
1902         /* make sure that "sAMAccountType" is not specified */
1903         el = ldb_msg_find_element(req->op.mod.message, "sAMAccountType");
1904         if (el != NULL) {
1905                 ldb_set_errstring(ldb,
1906                                   "samldb: sAMAccountType must not be specified!");
1907                 return LDB_ERR_UNWILLING_TO_PERFORM;
1908         }
1909         /* make sure that "isCriticalSystemObject" is not specified */
1910         el = ldb_msg_find_element(req->op.mod.message, "isCriticalSystemObject");
1911         if (el != NULL) {
1912                 if (ldb_request_get_control(req, LDB_CONTROL_RELAX_OID) == NULL) {
1913                         ldb_set_errstring(ldb,
1914                                           "samldb: isCriticalSystemObject must not be specified!");
1915                         return LDB_ERR_UNWILLING_TO_PERFORM;
1916                 }
1917         }
1918
1919         /* msDS-IntId is not allowed to be modified
1920          * except when modification comes from replication */
1921         if (ldb_msg_find_element(req->op.mod.message, "msDS-IntId")) {
1922                 if (!ldb_request_get_control(req,
1923                                              DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
1924                         return LDB_ERR_CONSTRAINT_VIOLATION;
1925                 }
1926         }
1927
1928         ac = samldb_ctx_init(module, req);
1929         if (ac == NULL) {
1930                 return ldb_operr(ldb);
1931         }
1932
1933         /* build the new msg */
1934         ac->msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
1935         if (ac->msg == NULL) {
1936                 talloc_free(ac);
1937                 ldb_debug(ldb, LDB_DEBUG_FATAL,
1938                           "samldb_modify: ldb_msg_copy_shallow failed!\n");
1939                 return ldb_operr(ldb);
1940         }
1941
1942         el = ldb_msg_find_element(ac->msg, "primaryGroupID");
1943         if (el != NULL) {
1944                 ret = samldb_prim_group_change(ac);
1945                 if (ret != LDB_SUCCESS) {
1946                         return ret;
1947                 }
1948         }
1949
1950         el = ldb_msg_find_element(ac->msg, "userAccountControl");
1951         if (el != NULL) {
1952                 modified = true;
1953                 ret = samldb_user_account_control_change(ac);
1954                 if (ret != LDB_SUCCESS) {
1955                         return ret;
1956                 }
1957         }
1958
1959         el = ldb_msg_find_element(ac->msg, "groupType");
1960         if (el != NULL) {
1961                 modified = true;
1962                 ret = samldb_group_type_change(ac);
1963                 if (ret != LDB_SUCCESS) {
1964                         return ret;
1965                 }
1966         }
1967
1968         el = ldb_msg_find_element(ac->msg, "sAMAccountName");
1969         if (el != NULL) {
1970                 ret = samldb_sam_accountname_check(ac);
1971                 if (ret != LDB_SUCCESS) {
1972                         return ret;
1973                 }
1974         }
1975
1976         el = ldb_msg_find_element(ac->msg, "member");
1977         if (el != NULL) {
1978                 ret = samldb_member_check(ac);
1979                 if (ret != LDB_SUCCESS) {
1980                         return ret;
1981                 }
1982         }
1983
1984         el = ldb_msg_find_element(ac->msg, "description");
1985         if (el != NULL) {
1986                 ret = samldb_description_check(ac);
1987                 if (ret != LDB_SUCCESS) {
1988                         return ret;
1989                 }
1990         }
1991
1992         el = ldb_msg_find_element(ac->msg, "dNSHostName");
1993         el2 = ldb_msg_find_element(ac->msg, "sAMAccountName");
1994         if ((el != NULL) || (el2 != NULL)) {
1995                 modified = true;
1996                 ret = samldb_service_principal_names_change(ac);
1997                 if (ret != LDB_SUCCESS) {
1998                         return ret;
1999                 }
2000         }
2001
2002         if (modified) {
2003                 struct ldb_request *child_req;
2004
2005                 /* Now perform the real modifications as a child request */
2006                 ret = ldb_build_mod_req(&child_req, ldb, ac,
2007                                         ac->msg,
2008                                         req->controls,
2009                                         req, dsdb_next_callback,
2010                                         req);
2011                 LDB_REQ_SET_LOCATION(child_req);
2012                 if (ret != LDB_SUCCESS) {
2013                         return ret;
2014                 }
2015
2016                 return ldb_next_request(module, child_req);
2017         }
2018
2019         talloc_free(ac);
2020
2021         /* no change which interests us, go on */
2022         return ldb_next_request(module, req);
2023 }
2024
2025 /* delete */
2026
2027 static int samldb_prim_group_users_check(struct samldb_ctx *ac)
2028 {
2029         struct ldb_context *ldb;
2030         struct dom_sid *sid;
2031         uint32_t rid;
2032         NTSTATUS status;
2033         int count;
2034
2035         ldb = ldb_module_get_ctx(ac->module);
2036
2037         /* Finds out the SID/RID of the SAM object */
2038         sid = samdb_search_dom_sid(ldb, ac, ac->req->op.del.dn, "objectSid",
2039                                    NULL);
2040         if (sid == NULL) {
2041                 /* No SID - it might not be a SAM object - therefore ok */
2042                 return LDB_SUCCESS;
2043         }
2044         status = dom_sid_split_rid(ac, sid, NULL, &rid);
2045         if (!NT_STATUS_IS_OK(status)) {
2046                 return ldb_operr(ldb);
2047         }
2048         if (rid == 0) {
2049                 /* Special object (security principal?) */
2050                 return LDB_SUCCESS;
2051         }
2052
2053         /* Deny delete requests from groups which are primary ones */
2054         count = samdb_search_count(ldb, ac, NULL,
2055                                    "(&(primaryGroupID=%u)(objectClass=user))",
2056                                    rid);
2057         if (count < 0) {
2058                 return ldb_operr(ldb);
2059         }
2060         if (count > 0) {
2061                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
2062         }
2063
2064         return LDB_SUCCESS;
2065 }
2066
2067 static int samldb_delete(struct ldb_module *module, struct ldb_request *req)
2068 {
2069         struct samldb_ctx *ac;
2070         int ret;
2071
2072         if (ldb_dn_is_special(req->op.del.dn)) {
2073                 /* do not manipulate our control entries */
2074                 return ldb_next_request(module, req);
2075         }
2076
2077         ac = samldb_ctx_init(module, req);
2078         if (ac == NULL) {
2079                 return ldb_operr(ldb_module_get_ctx(module));
2080         }
2081
2082         ret = samldb_prim_group_users_check(ac);
2083         if (ret != LDB_SUCCESS) {
2084                 return ret;
2085         }
2086
2087         talloc_free(ac);
2088
2089         return ldb_next_request(module, req);
2090 }
2091
2092 /* extended */
2093
2094 static int samldb_extended_allocate_rid_pool(struct ldb_module *module, struct ldb_request *req)
2095 {
2096         struct ldb_context *ldb = ldb_module_get_ctx(module);
2097         struct dsdb_fsmo_extended_op *exop;
2098         int ret;
2099
2100         exop = talloc_get_type(req->op.extended.data,
2101                                struct dsdb_fsmo_extended_op);
2102         if (!exop) {
2103                 ldb_set_errstring(ldb,
2104                                   "samldb_extended_allocate_rid_pool: invalid extended data");
2105                 return LDB_ERR_PROTOCOL_ERROR;
2106         }
2107
2108         ret = ridalloc_allocate_rid_pool_fsmo(module, exop);
2109         if (ret != LDB_SUCCESS) {
2110                 return ret;
2111         }
2112
2113         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2114 }
2115
2116 static int samldb_extended(struct ldb_module *module, struct ldb_request *req)
2117 {
2118         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_ALLOCATE_RID_POOL) == 0) {
2119                 return samldb_extended_allocate_rid_pool(module, req);
2120         }
2121
2122         return ldb_next_request(module, req);
2123 }
2124
2125
2126 static const struct ldb_module_ops ldb_samldb_module_ops = {
2127         .name          = "samldb",
2128         .add           = samldb_add,
2129         .modify        = samldb_modify,
2130         .del           = samldb_delete,
2131         .extended      = samldb_extended
2132 };
2133
2134
2135 int ldb_samldb_module_init(const char *version)
2136 {
2137         LDB_MODULE_CHECK_VERSION(version);
2138         return ldb_register_module(&ldb_samldb_module_ops);
2139 }