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