source4/dsdb/samdb/ldb_modules/samldb.c

   1 /*
   2    SAM ldb module
   3
   4    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   5    Copyright (C) Simo Sorce  2004-2008
   6    Copyright (C) Matthias Dieter Wallnöfer 2009-2011
   7    Copyright (C) Matthieu Patou 2012
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /*
  24  *  Name: ldb
  25  *
  26  *  Component: ldb samldb module
  27  *
  28  *  Description: various internal DSDB triggers - most for SAM specific objects
  29  *
  30  *  Author: Simo Sorce
  31  */
  32
  33 #include "includes.h"
  34 #include "libcli/ldap/ldap_ndr.h"
  35 #include "ldb_module.h"
  36 #include "dsdb/samdb/samdb.h"
  37 #include "dsdb/samdb/ldb_modules/util.h"
  38 #include "dsdb/samdb/ldb_modules/ridalloc.h"
  39 #include "libcli/security/security.h"
  40 #include "librpc/gen_ndr/ndr_security.h"
  41 #include "ldb_wrap.h"
  42 #include "param/param.h"
  43 #include "libds/common/flag_mapping.h"
  44
  45 struct samldb_ctx;
  46 enum samldb_add_type {
  47         SAMLDB_TYPE_USER,
  48         SAMLDB_TYPE_GROUP,
  49         SAMLDB_TYPE_CLASS,
  50         SAMLDB_TYPE_ATTRIBUTE
  51 };
  52
  53 typedef int (*samldb_step_fn_t)(struct samldb_ctx *);
  54
  55 struct samldb_step {
  56         struct samldb_step *next;
  57         samldb_step_fn_t fn;
  58 };
  59
  60 struct samldb_ctx {
  61         struct ldb_module *module;
  62         struct ldb_request *req;
  63
  64         /* used for add operations */
  65         enum samldb_add_type type;
  66
  67         /* the resulting message */
  68         struct ldb_message *msg;
  69
  70         /* used in "samldb_find_for_defaultObjectCategory" */
  71         struct ldb_dn *dn, *res_dn;
  72
  73         /* all the async steps necessary to complete the operation */
  74         struct samldb_step *steps;
  75         struct samldb_step *curstep;
  76
  77         /* If someone set an ares to forward controls and response back to the caller */
  78         struct ldb_reply *ares;
  79 };
  80
  81 static struct samldb_ctx *samldb_ctx_init(struct ldb_module *module,
  82                                           struct ldb_request *req)
  83 {
  84         struct ldb_context *ldb;
  85         struct samldb_ctx *ac;
  86
  87         ldb = ldb_module_get_ctx(module);
  88
  89         ac = talloc_zero(req, struct samldb_ctx);
  90         if (ac == NULL) {
  91                 ldb_oom(ldb);
  92                 return NULL;
  93         }
  94
  95         ac->module = module;
  96         ac->req = req;
  97
  98         return ac;
  99 }
 100
 101 static int samldb_add_step(struct samldb_ctx *ac, samldb_step_fn_t fn)
 102 {
 103         struct samldb_step *step, *stepper;
 104
 105         step = talloc_zero(ac, struct samldb_step);
 106         if (step == NULL) {
 107                 return ldb_oom(ldb_module_get_ctx(ac->module));
 108         }
 109
 110         step->fn = fn;
 111
 112         if (ac->steps == NULL) {
 113                 ac->steps = step;
 114                 ac->curstep = step;
 115         } else {
 116                 if (ac->curstep == NULL)
 117                         return ldb_operr(ldb_module_get_ctx(ac->module));
 118                 for (stepper = ac->curstep; stepper->next != NULL;
 119                         stepper = stepper->next);
 120                 stepper->next = step;
 121         }
 122
 123         return LDB_SUCCESS;
 124 }
 125
 126 static int samldb_first_step(struct samldb_ctx *ac)
 127 {
 128         if (ac->steps == NULL) {
 129                 return ldb_operr(ldb_module_get_ctx(ac->module));
 130         }
 131
 132         ac->curstep = ac->steps;
 133         return ac->curstep->fn(ac);
 134 }
 135
 136 static int samldb_next_step(struct samldb_ctx *ac)
 137 {
 138         if (ac->curstep->next) {
 139                 ac->curstep = ac->curstep->next;
 140                 return ac->curstep->fn(ac);
 141         }
 142
 143         /* We exit the samldb module here. If someone set an "ares" to forward
 144          * controls and response back to the caller, use them. */
 145         if (ac->ares) {
 146                 return ldb_module_done(ac->req, ac->ares->controls,
 147                                        ac->ares->response, LDB_SUCCESS);
 148         } else {
 149                 return ldb_module_done(ac->req, NULL, NULL, LDB_SUCCESS);
 150         }
 151 }
 152
 153
 154 /* sAMAccountName handling */
 155
 156 static int samldb_generate_sAMAccountName(struct ldb_context *ldb,
 157                                           struct ldb_message *msg)
 158 {
 159         char *name;
 160
 161         /* Format: $000000-000000000000 */
 162
 163         name = talloc_asprintf(msg, "$%.6X-%.6X%.6X",
 164                                 (unsigned int)generate_random(),
 165                                 (unsigned int)generate_random(),
 166                                 (unsigned int)generate_random());
 167         if (name == NULL) {
 168                 return ldb_oom(ldb);
 169         }
 170         return ldb_msg_add_steal_string(msg, "sAMAccountName", name);
 171 }
 172
 173 static int samldb_check_sAMAccountName(struct samldb_ctx *ac)
 174 {
 175         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 176         const char *name;
 177         int ret;
 178         struct ldb_result *res;
 179         const char * const noattrs[] = { NULL };
 180
 181         if (ldb_msg_find_element(ac->msg, "sAMAccountName") == NULL) {
 182                 ret = samldb_generate_sAMAccountName(ldb, ac->msg);
 183                 if (ret != LDB_SUCCESS) {
 184                         return ret;
 185                 }
 186         }
 187
 188         name = ldb_msg_find_attr_as_string(ac->msg, "sAMAccountName", NULL);
 189         if (name == NULL) {
 190                 /* The "sAMAccountName" cannot be nothing */
 191                 ldb_set_errstring(ldb,
 192                                   "samldb: Empty account names aren't allowed!");
 193                 return LDB_ERR_CONSTRAINT_VIOLATION;
 194         }
 195
 196         ret = dsdb_module_search(ac->module, ac, &res,
 197                                  ldb_get_default_basedn(ldb), LDB_SCOPE_SUBTREE, noattrs,
 198                                  DSDB_FLAG_NEXT_MODULE,
 199                                  ac->req,
 200                                  "(sAMAccountName=%s)",
 201                                  ldb_binary_encode_string(ac, name));
 202         if (ret != LDB_SUCCESS) {
 203                 return ret;
 204         }
 205         if (res->count != 0) {
 206                 ldb_asprintf_errstring(ldb,
 207                                        "samldb: Account name (sAMAccountName) '%s' already in use!",
 208                                        name);
 209                 talloc_free(res);
 210                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
 211         }
 212         talloc_free(res);
 213
 214         return samldb_next_step(ac);
 215 }
 216
 217
 218 static bool samldb_msg_add_sid(struct ldb_message *msg,
 219                                 const char *name,
 220                                 const struct dom_sid *sid)
 221 {
 222         struct ldb_val v;
 223         enum ndr_err_code ndr_err;
 224
 225         ndr_err = ndr_push_struct_blob(&v, msg, sid,
 226                                        (ndr_push_flags_fn_t)ndr_push_dom_sid);
 227         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 228                 return false;
 229         }
 230         return (ldb_msg_add_value(msg, name, &v, NULL) == 0);
 231 }
 232
 233
 234 /* allocate a SID using our RID Set */
 235 static int samldb_allocate_sid(struct samldb_ctx *ac)
 236 {
 237         uint32_t rid;
 238         struct dom_sid *sid;
 239         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 240         int ret;
 241
 242         ret = ridalloc_allocate_rid(ac->module, &rid, ac->req);
 243         if (ret != LDB_SUCCESS) {
 244                 return ret;
 245         }
 246
 247         sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), rid);
 248         if (sid == NULL) {
 249                 return ldb_module_oom(ac->module);
 250         }
 251
 252         if ( ! samldb_msg_add_sid(ac->msg, "objectSid", sid)) {
 253                 return ldb_operr(ldb);
 254         }
 255
 256         return samldb_next_step(ac);
 257 }
 258
 259 /*
 260   see if a krbtgt_number is available
 261  */
 262 static bool samldb_krbtgtnumber_available(struct samldb_ctx *ac,
 263                                           uint32_t krbtgt_number)
 264 {
 265         TALLOC_CTX *tmp_ctx = talloc_new(ac);
 266         struct ldb_result *res;
 267         const char * const no_attrs[] = { NULL };
 268         int ret;
 269
 270         ret = dsdb_module_search(ac->module, tmp_ctx, &res,
 271                                  ldb_get_default_basedn(ldb_module_get_ctx(ac->module)),
 272                                  LDB_SCOPE_SUBTREE, no_attrs,
 273                                  DSDB_FLAG_NEXT_MODULE,
 274                                  ac->req,
 275                                  "(msDC-SecondaryKrbTgtNumber=%u)",
 276                                  krbtgt_number);
 277         if (ret == LDB_SUCCESS && res->count == 0) {
 278                 talloc_free(tmp_ctx);
 279                 return true;
 280         }
 281         talloc_free(tmp_ctx);
 282         return false;
 283 }
 284
 285 /* special handling for add in RODC join */
 286 static int samldb_rodc_add(struct samldb_ctx *ac)
 287 {
 288         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 289         uint32_t krbtgt_number, i_start, i;
 290         int ret;
 291         char *newpass;
 292         struct ldb_val newpass_utf16;
 293
 294         /* find a unused msDC-SecondaryKrbTgtNumber */
 295         i_start = generate_random() & 0xFFFF;
 296         if (i_start == 0) {
 297                 i_start = 1;
 298         }
 299
 300         for (i=i_start; i<=0xFFFF; i++) {
 301                 if (samldb_krbtgtnumber_available(ac, i)) {
 302                         krbtgt_number = i;
 303                         goto found;
 304                 }
 305         }
 306         for (i=1; i<i_start; i++) {
 307                 if (samldb_krbtgtnumber_available(ac, i)) {
 308                         krbtgt_number = i;
 309                         goto found;
 310                 }
 311         }
 312
 313         ldb_asprintf_errstring(ldb,
 314                                "%08X: Unable to find available msDS-SecondaryKrbTgtNumber",
 315                                W_ERROR_V(WERR_NO_SYSTEM_RESOURCES));
 316         return LDB_ERR_OTHER;
 317
 318 found:
 319         ret = ldb_msg_add_empty(ac->msg, "msDS-SecondaryKrbTgtNumber",
 320                                 LDB_FLAG_INTERNAL_DISABLE_VALIDATION, NULL);
 321         if (ret != LDB_SUCCESS) {
 322                 return ldb_operr(ldb);
 323         }
 324
 325         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
 326                                  "msDS-SecondaryKrbTgtNumber", krbtgt_number);
 327         if (ret != LDB_SUCCESS) {
 328                 return ldb_operr(ldb);
 329         }
 330
 331         ret = ldb_msg_add_fmt(ac->msg, "sAMAccountName", "krbtgt_%u",
 332                               krbtgt_number);
 333         if (ret != LDB_SUCCESS) {
 334                 return ldb_operr(ldb);
 335         }
 336
 337         newpass = generate_random_password(ac->msg, 128, 255);
 338         if (newpass == NULL) {
 339                 return ldb_operr(ldb);
 340         }
 341
 342         if (!convert_string_talloc(ac,
 343                                    CH_UNIX, CH_UTF16,
 344                                    newpass, strlen(newpass),
 345                                    (void *)&newpass_utf16.data,
 346                                    &newpass_utf16.length)) {
 347                 ldb_asprintf_errstring(ldb,
 348                                        "samldb_rodc_add: "
 349                                        "failed to generate UTF16 password from random password");
 350                 return LDB_ERR_OPERATIONS_ERROR;
 351         }
 352         ret = ldb_msg_add_steal_value(ac->msg, "clearTextPassword", &newpass_utf16);
 353         if (ret != LDB_SUCCESS) {
 354                 return ldb_operr(ldb);
 355         }
 356
 357         return samldb_next_step(ac);
 358 }
 359
 360 static int samldb_find_for_defaultObjectCategory(struct samldb_ctx *ac)
 361 {
 362         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 363         struct ldb_result *res;
 364         const char * const no_attrs[] = { NULL };
 365         int ret;
 366
 367         ac->res_dn = NULL;
 368
 369         ret = dsdb_module_search(ac->module, ac, &res,
 370                                  ac->dn, LDB_SCOPE_BASE, no_attrs,
 371                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT
 372                                  | DSDB_FLAG_NEXT_MODULE,
 373                                  ac->req,
 374                                  "(objectClass=classSchema)");
 375         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 376                 /* Don't be pricky when the DN doesn't exist if we have the */
 377                 /* RELAX control specified */
 378                 if (ldb_request_get_control(ac->req,
 379                                             LDB_CONTROL_RELAX_OID) == NULL) {
 380                         ldb_set_errstring(ldb,
 381                                           "samldb_find_defaultObjectCategory: "
 382                                           "Invalid DN for 'defaultObjectCategory'!");
 383                         return LDB_ERR_CONSTRAINT_VIOLATION;
 384                 }
 385         }
 386         if ((ret != LDB_ERR_NO_SUCH_OBJECT) && (ret != LDB_SUCCESS)) {
 387                 return ret;
 388         }
 389
 390         if (ret == LDB_SUCCESS) {
 391                 /* ensure the defaultObjectCategory has a full GUID */
 392                 struct ldb_message *m;
 393                 m = ldb_msg_new(ac->msg);
 394                 if (m == NULL) {
 395                         return ldb_oom(ldb);
 396                 }
 397                 m->dn = ac->msg->dn;
 398                 if (ldb_msg_add_string(m, "defaultObjectCategory",
 399                                        ldb_dn_get_extended_linearized(m, res->msgs[0]->dn, 1)) !=
 400                     LDB_SUCCESS) {
 401                         return ldb_oom(ldb);
 402                 }
 403                 m->elements[0].flags = LDB_FLAG_MOD_REPLACE;
 404
 405                 ret = dsdb_module_modify(ac->module, m,
 406                                          DSDB_FLAG_NEXT_MODULE,
 407                                          ac->req);
 408                 if (ret != LDB_SUCCESS) {
 409                         return ret;
 410                 }
 411         }
 412
 413
 414         ac->res_dn = ac->dn;
 415
 416         return samldb_next_step(ac);
 417 }
 418
 419 /**
 420  * msDS-IntId attributeSchema attribute handling
 421  * during LDB_ADD request processing
 422  */
 423 static int samldb_add_handle_msDS_IntId(struct samldb_ctx *ac)
 424 {
 425         int ret;
 426         bool id_exists;
 427         uint32_t msds_intid;
 428         int32_t system_flags;
 429         struct ldb_context *ldb;
 430         struct ldb_result *ldb_res;
 431         struct ldb_dn *schema_dn;
 432         struct samldb_msds_intid_persistant *msds_intid_struct;
 433         struct dsdb_schema *schema;
 434
 435         ldb = ldb_module_get_ctx(ac->module);
 436         schema_dn = ldb_get_schema_basedn(ldb);
 437
 438         /* replicated update should always go through */
 439         if (ldb_request_get_control(ac->req,
 440                                     DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
 441                 return LDB_SUCCESS;
 442         }
 443
 444         /* msDS-IntId is handled by system and should never be
 445          * passed by clients */
 446         if (ldb_msg_find_element(ac->msg, "msDS-IntId")) {
 447                 return LDB_ERR_UNWILLING_TO_PERFORM;
 448         }
 449
 450         /* do not generate msDS-IntId if Relax control is passed */
 451         if (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
 452                 return LDB_SUCCESS;
 453         }
 454
 455         /* check Functional Level */
 456         if (dsdb_functional_level(ldb) < DS_DOMAIN_FUNCTION_2003) {
 457                 return LDB_SUCCESS;
 458         }
 459
 460         /* check systemFlags for SCHEMA_BASE_OBJECT flag */
 461         system_flags = ldb_msg_find_attr_as_int(ac->msg, "systemFlags", 0);
 462         if (system_flags & SYSTEM_FLAG_SCHEMA_BASE_OBJECT) {
 463                 return LDB_SUCCESS;
 464         }
 465         schema = dsdb_get_schema(ldb, NULL);
 466         if (!schema) {
 467                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 468                               "samldb_schema_info_update: no dsdb_schema loaded");
 469                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 470                 return ldb_operr(ldb);
 471         }
 472
 473         msds_intid_struct = (struct samldb_msds_intid_persistant*) ldb_get_opaque(ldb, SAMLDB_MSDS_INTID_OPAQUE);
 474         if (!msds_intid_struct) {
 475                 msds_intid_struct = talloc(ldb, struct samldb_msds_intid_persistant);
 476                 /* Generate new value for msDs-IntId
 477                 * Value should be in 0x80000000..0xBFFFFFFF range */
 478                 msds_intid = generate_random() % 0X3FFFFFFF;
 479                 msds_intid += 0x80000000;
 480                 msds_intid_struct->msds_intid = msds_intid;
 481                 msds_intid_struct->usn = schema->loaded_usn;
 482                 DEBUG(2, ("No samldb_msds_intid_persistant struct, allocating a new one\n"));
 483         } else {
 484                 msds_intid = msds_intid_struct->msds_intid;
 485         }
 486
 487         /* probe id values until unique one is found */
 488         do {
 489                 uint64_t current_usn;
 490                 msds_intid++;
 491                 if (msds_intid > 0xBFFFFFFF) {
 492                         msds_intid = 0x80000001;
 493                 }
 494                 /*
 495                  * Alternative strategy to a costly (even indexed search) to the
 496                  * database.
 497                  * We search in the schema if we have already this intid (using dsdb_attribute_by_attributeID_id because
 498                  * in the range 0x80000000 0xBFFFFFFFF, attributeID is a DSDB_ATTID_TYPE_INTID).
 499                  * If so generate another random value.
 500                  * If not check if the highest USN in the database for the schema partition is the
 501                  * one that we know.
 502                  * If so it means that's only this ldb context that is touching the schema in the database.
 503                  * If not it means that's someone else has modified the database while we are doing our changes too
 504                  * (this case should be very bery rare) in order to be sure do the search in the database.
 505                  */
 506                 if (dsdb_attribute_by_attributeID_id(schema, msds_intid)) {
 507                         msds_intid = generate_random() % 0X3FFFFFFF;
 508                         msds_intid += 0x80000000;
 509                         continue;
 510                 }
 511
 512                 ret = dsdb_module_load_partition_usn(ac->module, schema->base_dn, &current_usn, NULL, NULL);
 513                 if (ret != LDB_SUCCESS) {
 514                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 515                                       __location__": Searching for schema USN failed: %s\n",
 516                                       ldb_errstring(ldb));
 517                         return ldb_operr(ldb);
 518                 }
 519
 520                 /* current_usn can be lesser than msds_intid_struct-> if there is
 521                  * uncommited changes.
 522                  */
 523                 if (current_usn > msds_intid_struct->usn) {
 524                         /* oups something has changed, someone/something
 525                          * else is modifying or has modified the schema
 526                          * we'd better check this intid is the database directly
 527                          */
 528
 529                         DEBUG(2, ("Schema has changed, searching the database for the unicity of %d\n",
 530                                         msds_intid));
 531
 532                         ret = dsdb_module_search(ac->module, ac,
 533                                                 &ldb_res,
 534                                                 schema_dn, LDB_SCOPE_ONELEVEL, NULL,
 535                                                 DSDB_FLAG_NEXT_MODULE,
 536                                                 ac->req,
 537                                                 "(msDS-IntId=%d)", msds_intid);
 538                         if (ret != LDB_SUCCESS) {
 539                                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 540                                         __location__": Searching for msDS-IntId=%d failed - %s\n",
 541                                         msds_intid,
 542                                         ldb_errstring(ldb));
 543                                 return ldb_operr(ldb);
 544                         }
 545                         id_exists = (ldb_res->count > 0);
 546                         talloc_free(ldb_res);
 547                 } else {
 548                         id_exists = 0;
 549                 }
 550
 551         } while(id_exists);
 552         msds_intid_struct->msds_intid = msds_intid;
 553         ldb_set_opaque(ldb, SAMLDB_MSDS_INTID_OPAQUE, msds_intid_struct);
 554
 555         return samdb_msg_add_int(ldb, ac->msg, ac->msg, "msDS-IntId",
 556                                  msds_intid);
 557 }
 558
 559
 560 /*
 561  * samldb_add_entry (async)
 562  */
 563
 564 static int samldb_add_entry_callback(struct ldb_request *req,
 565                                         struct ldb_reply *ares)
 566 {
 567         struct ldb_context *ldb;
 568         struct samldb_ctx *ac;
 569         int ret;
 570
 571         ac = talloc_get_type(req->context, struct samldb_ctx);
 572         ldb = ldb_module_get_ctx(ac->module);
 573
 574         if (!ares) {
 575                 return ldb_module_done(ac->req, NULL, NULL,
 576                                         LDB_ERR_OPERATIONS_ERROR);
 577         }
 578
 579         if (ares->type == LDB_REPLY_REFERRAL) {
 580                 return ldb_module_send_referral(ac->req, ares->referral);
 581         }
 582
 583         if (ares->error != LDB_SUCCESS) {
 584                 return ldb_module_done(ac->req, ares->controls,
 585                                         ares->response, ares->error);
 586         }
 587         if (ares->type != LDB_REPLY_DONE) {
 588                 ldb_asprintf_errstring(ldb, "Invalid LDB reply type %d", ares->type);
 589                 return ldb_module_done(ac->req, NULL, NULL,
 590                                         LDB_ERR_OPERATIONS_ERROR);
 591         }
 592
 593         /* The caller may wish to get controls back from the add */
 594         ac->ares = talloc_steal(ac, ares);
 595
 596         ret = samldb_next_step(ac);
 597         if (ret != LDB_SUCCESS) {
 598                 return ldb_module_done(ac->req, NULL, NULL, ret);
 599         }
 600         return ret;
 601 }
 602
 603 static int samldb_add_entry(struct samldb_ctx *ac)
 604 {
 605         struct ldb_context *ldb;
 606         struct ldb_request *req;
 607         int ret;
 608
 609         ldb = ldb_module_get_ctx(ac->module);
 610
 611         ret = ldb_build_add_req(&req, ldb, ac,
 612                                 ac->msg,
 613                                 ac->req->controls,
 614                                 ac, samldb_add_entry_callback,
 615                                 ac->req);
 616         LDB_REQ_SET_LOCATION(req);
 617         if (ret != LDB_SUCCESS) {
 618                 return ret;
 619         }
 620
 621         return ldb_next_request(ac->module, req);
 622 }
 623
 624 /*
 625  * return true if msg carries an attributeSchema that is intended to be RODC
 626  * filtered but is also a system-critical attribute.
 627  */
 628 static bool check_rodc_critical_attribute(struct ldb_message *msg)
 629 {
 630         uint32_t schemaFlagsEx, searchFlags, rodc_filtered_flags;
 631
 632         schemaFlagsEx = ldb_msg_find_attr_as_uint(msg, "schemaFlagsEx", 0);
 633         searchFlags = ldb_msg_find_attr_as_uint(msg, "searchFlags", 0);
 634         rodc_filtered_flags = (SEARCH_FLAG_RODC_ATTRIBUTE
 635                               | SEARCH_FLAG_CONFIDENTIAL);
 636
 637         if ((schemaFlagsEx & SCHEMA_FLAG_ATTR_IS_CRITICAL) &&
 638                 ((searchFlags & rodc_filtered_flags) == rodc_filtered_flags)) {
 639                 return true;
 640         } else {
 641                 return false;
 642         }
 643 }
 644
 645
 646 static int samldb_fill_object(struct samldb_ctx *ac)
 647 {
 648         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 649         int ret;
 650
 651         /* Add information for the different account types */
 652         switch(ac->type) {
 653         case SAMLDB_TYPE_USER: {
 654                 struct ldb_control *rodc_control = ldb_request_get_control(ac->req,
 655                                                                            LDB_CONTROL_RODC_DCPROMO_OID);
 656                 if (rodc_control != NULL) {
 657                         /* see [MS-ADTS] 3.1.1.3.4.1.23 LDAP_SERVER_RODC_DCPROMO_OID */
 658                         rodc_control->critical = false;
 659                         ret = samldb_add_step(ac, samldb_rodc_add);
 660                         if (ret != LDB_SUCCESS) return ret;
 661                 }
 662
 663                 /* check if we have a valid sAMAccountName */
 664                 ret = samldb_add_step(ac, samldb_check_sAMAccountName);
 665                 if (ret != LDB_SUCCESS) return ret;
 666
 667                 ret = samldb_add_step(ac, samldb_add_entry);
 668                 if (ret != LDB_SUCCESS) return ret;
 669                 break;
 670         }
 671
 672         case SAMLDB_TYPE_GROUP: {
 673                 /* check if we have a valid sAMAccountName */
 674                 ret = samldb_add_step(ac, samldb_check_sAMAccountName);
 675                 if (ret != LDB_SUCCESS) return ret;
 676
 677                 ret = samldb_add_step(ac, samldb_add_entry);
 678                 if (ret != LDB_SUCCESS) return ret;
 679                 break;
 680         }
 681
 682         case SAMLDB_TYPE_CLASS: {
 683                 const struct ldb_val *rdn_value, *def_obj_cat_val;
 684                 unsigned int v = ldb_msg_find_attr_as_uint(ac->msg, "objectClassCategory", -2);
 685
 686                 /* As discussed with Microsoft through dochelp in April 2012 this is the behavior of windows*/
 687                 if (!ldb_msg_find_element(ac->msg, "subClassOf")) {
 688                         ret = ldb_msg_add_string(ac->msg, "subClassOf", "top");
 689                         if (ret != LDB_SUCCESS) return ret;
 690                 }
 691
 692                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 693                                                   "rdnAttId", "cn");
 694                 if (ret != LDB_SUCCESS) return ret;
 695
 696                 /* do not allow to mark an attributeSchema as RODC filtered if it
 697                  * is system-critical */
 698                 if (check_rodc_critical_attribute(ac->msg)) {
 699                         ldb_asprintf_errstring(ldb, "Refusing schema add of %s - cannot combine critical class with RODC filtering",
 700                                                ldb_dn_get_linearized(ac->msg->dn));
 701                         return LDB_ERR_UNWILLING_TO_PERFORM;
 702                 }
 703
 704                 rdn_value = ldb_dn_get_rdn_val(ac->msg->dn);
 705                 if (rdn_value == NULL) {
 706                         return ldb_operr(ldb);
 707                 }
 708                 if (!ldb_msg_find_element(ac->msg, "lDAPDisplayName")) {
 709                         /* the RDN has prefix "CN" */
 710                         ret = ldb_msg_add_string(ac->msg, "lDAPDisplayName",
 711                                 samdb_cn_to_lDAPDisplayName(ac->msg,
 712                                                             (const char *) rdn_value->data));
 713                         if (ret != LDB_SUCCESS) {
 714                                 ldb_oom(ldb);
 715                                 return ret;
 716                         }
 717                 }
 718
 719                 if (!ldb_msg_find_element(ac->msg, "schemaIDGUID")) {
 720                         struct GUID guid;
 721                         /* a new GUID */
 722                         guid = GUID_random();
 723                         ret = dsdb_msg_add_guid(ac->msg, &guid, "schemaIDGUID");
 724                         if (ret != LDB_SUCCESS) {
 725                                 ldb_oom(ldb);
 726                                 return ret;
 727                         }
 728                 }
 729
 730                 def_obj_cat_val = ldb_msg_find_ldb_val(ac->msg,
 731                                                        "defaultObjectCategory");
 732                 if (def_obj_cat_val != NULL) {
 733                         /* "defaultObjectCategory" has been set by the caller.
 734                          * Do some checks for consistency.
 735                          * NOTE: The real constraint check (that
 736                          * 'defaultObjectCategory' is the DN of the new
 737                          * objectclass or any parent of it) is still incomplete.
 738                          * For now we say that 'defaultObjectCategory' is valid
 739                          * if it exists and it is of objectclass "classSchema".
 740                          */
 741                         ac->dn = ldb_dn_from_ldb_val(ac, ldb, def_obj_cat_val);
 742                         if (ac->dn == NULL) {
 743                                 ldb_set_errstring(ldb,
 744                                                   "Invalid DN for 'defaultObjectCategory'!");
 745                                 return LDB_ERR_CONSTRAINT_VIOLATION;
 746                         }
 747                 } else {
 748                         /* "defaultObjectCategory" has not been set by the
 749                          * caller. Use the entry DN for it. */
 750                         ac->dn = ac->msg->dn;
 751
 752                         ret = ldb_msg_add_string(ac->msg, "defaultObjectCategory",
 753                                                  ldb_dn_alloc_linearized(ac->msg, ac->dn));
 754                         if (ret != LDB_SUCCESS) {
 755                                 ldb_oom(ldb);
 756                                 return ret;
 757                         }
 758                 }
 759
 760                 ret = samldb_add_step(ac, samldb_add_entry);
 761                 if (ret != LDB_SUCCESS) return ret;
 762
 763                 /* Now perform the checks for the 'defaultObjectCategory'. The
 764                  * lookup DN was already saved in "ac->dn" */
 765                 ret = samldb_add_step(ac, samldb_find_for_defaultObjectCategory);
 766                 if (ret != LDB_SUCCESS) return ret;
 767
 768                 /* -2 is not a valid objectClassCategory so it means the attribute wasn't present */
 769                 if (v == -2) {
 770                         /* Windows 2003 does this*/
 771                         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "objectClassCategory", 0);
 772                         if (ret != LDB_SUCCESS) {
 773                                 return ret;
 774                         }
 775                 }
 776                 break;
 777         }
 778
 779         case SAMLDB_TYPE_ATTRIBUTE: {
 780                 const struct ldb_val *rdn_value;
 781                 struct ldb_message_element *el;
 782                 rdn_value = ldb_dn_get_rdn_val(ac->msg->dn);
 783                 if (rdn_value == NULL) {
 784                         return ldb_operr(ldb);
 785                 }
 786                 if (!ldb_msg_find_element(ac->msg, "lDAPDisplayName")) {
 787                         /* the RDN has prefix "CN" */
 788                         ret = ldb_msg_add_string(ac->msg, "lDAPDisplayName",
 789                                 samdb_cn_to_lDAPDisplayName(ac->msg,
 790                                                             (const char *) rdn_value->data));
 791                         if (ret != LDB_SUCCESS) {
 792                                 ldb_oom(ldb);
 793                                 return ret;
 794                         }
 795                 }
 796
 797                 /* do not allow to mark an attributeSchema as RODC filtered if it
 798                  * is system-critical */
 799                 if (check_rodc_critical_attribute(ac->msg)) {
 800                         ldb_asprintf_errstring(ldb,
 801                                                "samldb: refusing schema add of %s - cannot combine critical attribute with RODC filtering",
 802                                                ldb_dn_get_linearized(ac->msg->dn));
 803                         return LDB_ERR_UNWILLING_TO_PERFORM;
 804                 }
 805
 806                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 807                                                   "isSingleValued", "FALSE");
 808                 if (ret != LDB_SUCCESS) return ret;
 809
 810                 if (!ldb_msg_find_element(ac->msg, "schemaIDGUID")) {
 811                         struct GUID guid;
 812                         /* a new GUID */
 813                         guid = GUID_random();
 814                         ret = dsdb_msg_add_guid(ac->msg, &guid, "schemaIDGUID");
 815                         if (ret != LDB_SUCCESS) {
 816                                 ldb_oom(ldb);
 817                                 return ret;
 818                         }
 819                 }
 820
 821                 el = ldb_msg_find_element(ac->msg, "attributeSyntax");
 822                 if (el) {
 823                         /*
 824                          * No need to scream if there isn't as we have code later on
 825                          * that will take care of it.
 826                          */
 827                         const struct dsdb_syntax *syntax = find_syntax_map_by_ad_oid((const char *)el->values[0].data);
 828                         if (!syntax) {
 829                                 DEBUG(9, ("Can't find dsdb_syntax object for attributeSyntax %s\n",
 830                                                 (const char *)el->values[0].data));
 831                         } else {
 832                                 unsigned int v = ldb_msg_find_attr_as_uint(ac->msg, "oMSyntax", 0);
 833                                 const struct ldb_val *val = ldb_msg_find_ldb_val(ac->msg, "oMObjectClass");
 834
 835                                 if (v == 0) {
 836                                         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "oMSyntax", syntax->oMSyntax);
 837                                         if (ret != LDB_SUCCESS) {
 838                                                 return ret;
 839                                         }
 840                                 }
 841                                 if (!val) {
 842                                         struct ldb_val val2 = ldb_val_dup(ldb, &syntax->oMObjectClass);
 843                                         if (val2.length > 0) {
 844                                                 ret = ldb_msg_add_value(ac->msg, "oMObjectClass", &val2, NULL);
 845                                                 if (ret != LDB_SUCCESS) {
 846                                                         return ret;
 847                                                 }
 848                                         }
 849                                 }
 850                         }
 851                 }
 852
 853                 /* handle msDS-IntID attribute */
 854                 ret = samldb_add_handle_msDS_IntId(ac);
 855                 if (ret != LDB_SUCCESS) return ret;
 856
 857                 ret = samldb_add_step(ac, samldb_add_entry);
 858                 if (ret != LDB_SUCCESS) return ret;
 859                 break;
 860         }
 861
 862         default:
 863                 ldb_asprintf_errstring(ldb, "Invalid entry type!");
 864                 return LDB_ERR_OPERATIONS_ERROR;
 865                 break;
 866         }
 867
 868         return samldb_first_step(ac);
 869 }
 870
 871 static int samldb_fill_foreignSecurityPrincipal_object(struct samldb_ctx *ac)
 872 {
 873         struct ldb_context *ldb;
 874         const struct ldb_val *rdn_value;
 875         struct dom_sid *sid;
 876         int ret;
 877
 878         ldb = ldb_module_get_ctx(ac->module);
 879
 880         sid = samdb_result_dom_sid(ac->msg, ac->msg, "objectSid");
 881         if (sid == NULL) {
 882                 rdn_value = ldb_dn_get_rdn_val(ac->msg->dn);
 883                 if (rdn_value == NULL) {
 884                         return ldb_operr(ldb);
 885                 }
 886                 sid = dom_sid_parse_talloc(ac->msg,
 887                                            (const char *)rdn_value->data);
 888                 if (sid == NULL) {
 889                         ldb_set_errstring(ldb,
 890                                           "samldb: No valid SID found in ForeignSecurityPrincipal CN!");
 891                         return LDB_ERR_CONSTRAINT_VIOLATION;
 892                 }
 893                 if (! samldb_msg_add_sid(ac->msg, "objectSid", sid)) {
 894                         return ldb_operr(ldb);
 895                 }
 896         }
 897
 898         /* finally proceed with adding the entry */
 899         ret = samldb_add_step(ac, samldb_add_entry);
 900         if (ret != LDB_SUCCESS) return ret;
 901
 902         return samldb_first_step(ac);
 903 }
 904
 905 static int samldb_schema_info_update(struct samldb_ctx *ac)
 906 {
 907         int ret;
 908         struct ldb_context *ldb;
 909         struct dsdb_schema *schema;
 910
 911         /* replicated update should always go through */
 912         if (ldb_request_get_control(ac->req,
 913                                     DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
 914                 return LDB_SUCCESS;
 915         }
 916
 917         /* do not update schemaInfo during provisioning */
 918         if (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
 919                 return LDB_SUCCESS;
 920         }
 921
 922         ldb = ldb_module_get_ctx(ac->module);
 923         schema = dsdb_get_schema(ldb, NULL);
 924         if (!schema) {
 925                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 926                               "samldb_schema_info_update: no dsdb_schema loaded");
 927                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 928                 return ldb_operr(ldb);
 929         }
 930
 931         ret = dsdb_module_schema_info_update(ac->module, schema,
 932                                              DSDB_FLAG_NEXT_MODULE|
 933                                              DSDB_FLAG_AS_SYSTEM,
 934                                              ac->req);
 935         if (ret != LDB_SUCCESS) {
 936                 ldb_asprintf_errstring(ldb,
 937                                        "samldb_schema_info_update: dsdb_module_schema_info_update failed with %s",
 938                                        ldb_errstring(ldb));
 939                 return ret;
 940         }
 941
 942         return LDB_SUCCESS;
 943 }
 944
 945 static int samldb_prim_group_tester(struct samldb_ctx *ac, uint32_t rid);
 946
 947 /*
 948  * "Objectclass" trigger (MS-SAMR 3.1.1.8.1)
 949  *
 950  * Has to be invoked on "add" and "modify" operations on "user", "computer" and
 951  * "group" objects.
 952  * ac->msg contains the "add"/"modify" message
 953  * ac->type contains the object type (main objectclass)
 954  */
 955 static int samldb_objectclass_trigger(struct samldb_ctx *ac)
 956 {
 957         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 958         void *skip_allocate_sids = ldb_get_opaque(ldb,
 959                                                   "skip_allocate_sids");
 960         struct ldb_message_element *el, *el2;
 961         struct dom_sid *sid;
 962         int ret;
 963
 964         /* make sure that "sAMAccountType" is not specified */
 965         el = ldb_msg_find_element(ac->msg, "sAMAccountType");
 966         if (el != NULL) {
 967                 ldb_set_errstring(ldb,
 968                                   "samldb: sAMAccountType must not be specified!");
 969                 return LDB_ERR_UNWILLING_TO_PERFORM;
 970         }
 971
 972         /* Step 1: objectSid assignment */
 973
 974         /* Don't allow the objectSid to be changed. But beside the RELAX
 975          * control we have also to guarantee that it can always be set with
 976          * SYSTEM permissions. This is needed for the "samba3sam" backend. */
 977         sid = samdb_result_dom_sid(ac, ac->msg, "objectSid");
 978         if ((sid != NULL) && (!dsdb_module_am_system(ac->module)) &&
 979             (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID) == NULL)) {
 980                 ldb_set_errstring(ldb,
 981                                   "samldb: objectSid must not be specified!");
 982                 return LDB_ERR_UNWILLING_TO_PERFORM;
 983         }
 984
 985         /* but generate a new SID when we do have an add operations */
 986         if ((sid == NULL) && (ac->req->operation == LDB_ADD) && !skip_allocate_sids) {
 987                 ret = samldb_add_step(ac, samldb_allocate_sid);
 988                 if (ret != LDB_SUCCESS) return ret;
 989         }
 990
 991         switch(ac->type) {
 992         case SAMLDB_TYPE_USER: {
 993                 bool uac_generated = false, uac_add_flags = false;
 994
 995                 /* Step 1.2: Default values */
 996                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 997                         "accountExpires", "9223372036854775807");
 998                 if (ret != LDB_SUCCESS) return ret;
 999                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1000                         "badPasswordTime", "0");
1001                 if (ret != LDB_SUCCESS) return ret;
1002                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1003                         "badPwdCount", "0");
1004                 if (ret != LDB_SUCCESS) return ret;
1005                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1006                         "codePage", "0");
1007                 if (ret != LDB_SUCCESS) return ret;
1008                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1009                         "countryCode", "0");
1010                 if (ret != LDB_SUCCESS) return ret;
1011                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1012                         "lastLogoff", "0");
1013                 if (ret != LDB_SUCCESS) return ret;
1014                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1015                         "lastLogon", "0");
1016                 if (ret != LDB_SUCCESS) return ret;
1017                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1018                         "logonCount", "0");
1019                 if (ret != LDB_SUCCESS) return ret;
1020                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1021                         "pwdLastSet", "0");
1022                 if (ret != LDB_SUCCESS) return ret;
1023
1024                 /* On add operations we might need to generate a
1025                  * "userAccountControl" (if it isn't specified). */
1026                 el = ldb_msg_find_element(ac->msg, "userAccountControl");
1027                 if ((el == NULL) && (ac->req->operation == LDB_ADD)) {
1028                         ret = samdb_msg_set_uint(ldb, ac->msg, ac->msg,
1029                                                  "userAccountControl",
1030                                                  UF_NORMAL_ACCOUNT);
1031                         if (ret != LDB_SUCCESS) {
1032                                 return ret;
1033                         }
1034                         uac_generated = true;
1035                         uac_add_flags = true;
1036                 }
1037
1038                 el = ldb_msg_find_element(ac->msg, "userAccountControl");
1039                 if (el != NULL) {
1040                         uint32_t user_account_control, account_type;
1041
1042                         /* Step 1.3: "userAccountControl" -> "sAMAccountType" mapping */
1043                         user_account_control = ldb_msg_find_attr_as_uint(ac->msg,
1044                                                                          "userAccountControl",
1045                                                                          0);
1046                         /* "userAccountControl" = 0 means "UF_NORMAL_ACCOUNT" */
1047                         if (user_account_control == 0) {
1048                                 user_account_control = UF_NORMAL_ACCOUNT;
1049                                 uac_generated = true;
1050                         }
1051
1052                         /*
1053                          * As per MS-SAMR 3.1.1.8.10 these flags have not to be set
1054                          */
1055                         if ((user_account_control & UF_LOCKOUT) != 0) {
1056                                 user_account_control &= ~UF_LOCKOUT;
1057                                 uac_generated = true;
1058                         }
1059                         if ((user_account_control & UF_PASSWORD_EXPIRED) != 0) {
1060                                 user_account_control &= ~UF_PASSWORD_EXPIRED;
1061                                 uac_generated = true;
1062                         }
1063
1064                         /* Temporary duplicate accounts aren't allowed */
1065                         if ((user_account_control & UF_TEMP_DUPLICATE_ACCOUNT) != 0) {
1066                                 return LDB_ERR_OTHER;
1067                         }
1068
1069                         /* Workstation and (read-only) DC objects do need objectclass "computer" */
1070                         if ((samdb_find_attribute(ldb, ac->msg,
1071                                                   "objectclass", "computer") == NULL) &&
1072                             (user_account_control &
1073                              (UF_SERVER_TRUST_ACCOUNT | UF_WORKSTATION_TRUST_ACCOUNT))) {
1074                                 ldb_set_errstring(ldb,
1075                                                   "samldb: Requested account type does need objectclass 'computer'!");
1076                                 return LDB_ERR_OBJECT_CLASS_VIOLATION;
1077                         }
1078
1079                         account_type = ds_uf2atype(user_account_control);
1080                         if (account_type == 0) {
1081                                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
1082                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1083                         }
1084                         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
1085                                                  "sAMAccountType",
1086                                                  account_type);
1087                         if (ret != LDB_SUCCESS) {
1088                                 return ret;
1089                         }
1090                         el2 = ldb_msg_find_element(ac->msg, "sAMAccountType");
1091                         el2->flags = LDB_FLAG_MOD_REPLACE;
1092
1093                         /* "isCriticalSystemObject" might be set */
1094                         if (user_account_control &
1095                             (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
1096                                 ret = ldb_msg_add_string(ac->msg, "isCriticalSystemObject",
1097                                                          "TRUE");
1098                                 if (ret != LDB_SUCCESS) {
1099                                         return ret;
1100                                 }
1101                                 el2 = ldb_msg_find_element(ac->msg,
1102                                                            "isCriticalSystemObject");
1103                                 el2->flags = LDB_FLAG_MOD_REPLACE;
1104                         } else if (user_account_control & UF_WORKSTATION_TRUST_ACCOUNT) {
1105                                 ret = ldb_msg_add_string(ac->msg, "isCriticalSystemObject",
1106                                                          "FALSE");
1107                                 if (ret != LDB_SUCCESS) {
1108                                         return ret;
1109                                 }
1110                                 el2 = ldb_msg_find_element(ac->msg,
1111                                                            "isCriticalSystemObject");
1112                                 el2->flags = LDB_FLAG_MOD_REPLACE;
1113                         }
1114
1115                         /* Step 1.4: "userAccountControl" -> "primaryGroupID" mapping */
1116                         if (!ldb_msg_find_element(ac->msg, "primaryGroupID")) {
1117                                 uint32_t rid = ds_uf2prim_group_rid(user_account_control);
1118
1119                                 /*
1120                                  * Older AD deployments don't know about the
1121                                  * RODC group
1122                                  */
1123                                 if (rid == DOMAIN_RID_READONLY_DCS) {
1124                                         ret = samldb_prim_group_tester(ac, rid);
1125                                         if (ret != LDB_SUCCESS) {
1126                                                 return ret;
1127                                         }
1128                                 }
1129
1130                                 ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
1131                                                          "primaryGroupID", rid);
1132                                 if (ret != LDB_SUCCESS) {
1133                                         return ret;
1134                                 }
1135                                 el2 = ldb_msg_find_element(ac->msg,
1136                                                            "primaryGroupID");
1137                                 el2->flags = LDB_FLAG_MOD_REPLACE;
1138                         }
1139
1140                         /* Step 1.5: Add additional flags when needed */
1141                         /* Obviously this is done when the "userAccountControl"
1142                          * has been generated here (tested against Windows
1143                          * Server) */
1144                         if (uac_generated) {
1145                                 if (uac_add_flags) {
1146                                         user_account_control |= UF_ACCOUNTDISABLE;
1147                                         user_account_control |= UF_PASSWD_NOTREQD;
1148                                 }
1149
1150                                 ret = samdb_msg_set_uint(ldb, ac->msg, ac->msg,
1151                                                          "userAccountControl",
1152                                                          user_account_control);
1153                                 if (ret != LDB_SUCCESS) {
1154                                         return ret;
1155                                 }
1156                         }
1157                 }
1158                 break;
1159         }
1160
1161         case SAMLDB_TYPE_GROUP: {
1162                 const char *tempstr;
1163
1164                 /* Step 2.2: Default values */
1165                 tempstr = talloc_asprintf(ac->msg, "%d",
1166                                           GTYPE_SECURITY_GLOBAL_GROUP);
1167                 if (tempstr == NULL) return ldb_operr(ldb);
1168                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
1169                         "groupType", tempstr);
1170                 if (ret != LDB_SUCCESS) return ret;
1171
1172                 /* Step 2.3: "groupType" -> "sAMAccountType" */
1173                 el = ldb_msg_find_element(ac->msg, "groupType");
1174                 if (el != NULL) {
1175                         uint32_t group_type, account_type;
1176
1177                         group_type = ldb_msg_find_attr_as_uint(ac->msg,
1178                                                                "groupType", 0);
1179
1180                         /* The creation of builtin groups requires the
1181                          * RELAX control */
1182                         if (group_type == GTYPE_SECURITY_BUILTIN_LOCAL_GROUP) {
1183                                 if (ldb_request_get_control(ac->req,
1184                                                             LDB_CONTROL_RELAX_OID) == NULL) {
1185                                         return LDB_ERR_UNWILLING_TO_PERFORM;
1186                                 }
1187                         }
1188
1189                         account_type = ds_gtype2atype(group_type);
1190                         if (account_type == 0) {
1191                                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
1192                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1193                         }
1194                         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
1195                                                  "sAMAccountType",
1196                                                  account_type);
1197                         if (ret != LDB_SUCCESS) {
1198                                 return ret;
1199                         }
1200                         el2 = ldb_msg_find_element(ac->msg, "sAMAccountType");
1201                         el2->flags = LDB_FLAG_MOD_REPLACE;
1202                 }
1203                 break;
1204         }
1205
1206         default:
1207                 ldb_asprintf_errstring(ldb,
1208                                 "Invalid entry type!");
1209                 return LDB_ERR_OPERATIONS_ERROR;
1210                 break;
1211         }
1212
1213         return LDB_SUCCESS;
1214 }
1215
1216 /*
1217  * "Primary group ID" trigger (MS-SAMR 3.1.1.8.2)
1218  *
1219  * Has to be invoked on "add" and "modify" operations on "user" and "computer"
1220  * objects.
1221  * ac->msg contains the "add"/"modify" message
1222  */
1223
1224 static int samldb_prim_group_tester(struct samldb_ctx *ac, uint32_t rid)
1225 {
1226         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1227         struct dom_sid *sid;
1228         struct ldb_result *res;
1229         int ret;
1230         const char * const noattrs[] = { NULL };
1231
1232         sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), rid);
1233         if (sid == NULL) {
1234                 return ldb_operr(ldb);
1235         }
1236
1237         ret = dsdb_module_search(ac->module, ac, &res,
1238                                  ldb_get_default_basedn(ldb),
1239                                  LDB_SCOPE_SUBTREE,
1240                                  noattrs, DSDB_FLAG_NEXT_MODULE,
1241                                  ac->req,
1242                                  "(objectSid=%s)",
1243                                  ldap_encode_ndr_dom_sid(ac, sid));
1244         if (ret != LDB_SUCCESS) {
1245                 return ret;
1246         }
1247         if (res->count != 1) {
1248                 talloc_free(res);
1249                 ldb_asprintf_errstring(ldb,
1250                                        "Failed to find primary group with RID %u!",
1251                                        rid);
1252                 return LDB_ERR_UNWILLING_TO_PERFORM;
1253         }
1254         talloc_free(res);
1255
1256         return LDB_SUCCESS;
1257 }
1258
1259 static int samldb_prim_group_set(struct samldb_ctx *ac)
1260 {
1261         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1262         uint32_t rid;
1263
1264         rid = ldb_msg_find_attr_as_uint(ac->msg, "primaryGroupID", (uint32_t) -1);
1265         if (rid == (uint32_t) -1) {
1266                 /* we aren't affected of any primary group set */
1267                 return LDB_SUCCESS;
1268
1269         } else if (!ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
1270                 ldb_set_errstring(ldb,
1271                                   "The primary group isn't settable on add operations!");
1272                 return LDB_ERR_UNWILLING_TO_PERFORM;
1273         }
1274
1275         return samldb_prim_group_tester(ac, rid);
1276 }
1277
1278 static int samldb_prim_group_change(struct samldb_ctx *ac)
1279 {
1280         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1281         const char * const attrs[] = { "primaryGroupID", "memberOf", NULL };
1282         struct ldb_result *res, *group_res;
1283         struct ldb_message_element *el;
1284         struct ldb_message *msg;
1285         uint32_t prev_rid, new_rid;
1286         struct dom_sid *prev_sid, *new_sid;
1287         struct ldb_dn *prev_prim_group_dn, *new_prim_group_dn;
1288         int ret;
1289         const char * const noattrs[] = { NULL };
1290
1291         el = dsdb_get_single_valued_attr(ac->msg, "primaryGroupID",
1292                                          ac->req->operation);
1293         if (el == NULL) {
1294                 /* we are not affected */
1295                 return LDB_SUCCESS;
1296         }
1297
1298         /* Fetch information from the existing object */
1299
1300         ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, attrs,
1301                                     DSDB_FLAG_NEXT_MODULE, ac->req);
1302         if (ret != LDB_SUCCESS) {
1303                 return ret;
1304         }
1305
1306         /* Finds out the DN of the old primary group */
1307
1308         prev_rid = ldb_msg_find_attr_as_uint(res->msgs[0], "primaryGroupID",
1309                                              (uint32_t) -1);
1310         if (prev_rid == (uint32_t) -1) {
1311                 /* User objects do always have a mandatory "primaryGroupID"
1312                  * attribute. If this doesn't exist then the object is of the
1313                  * wrong type. This is the exact Windows error code */
1314                 return LDB_ERR_OBJECT_CLASS_VIOLATION;
1315         }
1316
1317         prev_sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), prev_rid);
1318         if (prev_sid == NULL) {
1319                 return ldb_operr(ldb);
1320         }
1321
1322         /* Finds out the DN of the new primary group
1323          * Notice: in order to parse the primary group ID correctly we create
1324          * a temporary message here. */
1325
1326         msg = ldb_msg_new(ac->msg);
1327         if (msg == NULL) {
1328                 return ldb_module_oom(ac->module);
1329         }
1330         ret = ldb_msg_add(msg, el, 0);
1331         if (ret != LDB_SUCCESS) {
1332                 return ret;
1333         }
1334         new_rid = ldb_msg_find_attr_as_uint(msg, "primaryGroupID", (uint32_t) -1);
1335         talloc_free(msg);
1336         if (new_rid == (uint32_t) -1) {
1337                 /* we aren't affected of any primary group change */
1338                 return LDB_SUCCESS;
1339         }
1340
1341         if (prev_rid == new_rid) {
1342                 return LDB_SUCCESS;
1343         }
1344
1345         ret = dsdb_module_search(ac->module, ac, &group_res,
1346                                  ldb_get_default_basedn(ldb),
1347                                  LDB_SCOPE_SUBTREE,
1348                                  noattrs, DSDB_FLAG_NEXT_MODULE,
1349                                  ac->req,
1350                                  "(objectSid=%s)",
1351                                  ldap_encode_ndr_dom_sid(ac, prev_sid));
1352         if (ret != LDB_SUCCESS) {
1353                 return ret;
1354         }
1355         if (group_res->count != 1) {
1356                 return ldb_operr(ldb);
1357         }
1358         prev_prim_group_dn = group_res->msgs[0]->dn;
1359
1360         new_sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), new_rid);
1361         if (new_sid == NULL) {
1362                 return ldb_operr(ldb);
1363         }
1364
1365         ret = dsdb_module_search(ac->module, ac, &group_res,
1366                                  ldb_get_default_basedn(ldb),
1367                                  LDB_SCOPE_SUBTREE,
1368                                  noattrs, DSDB_FLAG_NEXT_MODULE,
1369                                  ac->req,
1370                                  "(objectSid=%s)",
1371                                  ldap_encode_ndr_dom_sid(ac, new_sid));
1372         if (ret != LDB_SUCCESS) {
1373                 return ret;
1374         }
1375         if (group_res->count != 1) {
1376                 /* Here we know if the specified new primary group candidate is
1377                  * valid or not. */
1378                 return LDB_ERR_UNWILLING_TO_PERFORM;
1379         }
1380         new_prim_group_dn = group_res->msgs[0]->dn;
1381
1382         /* We need to be already a normal member of the new primary
1383          * group in order to be successful. */
1384         el = samdb_find_attribute(ldb, res->msgs[0], "memberOf",
1385                                   ldb_dn_get_linearized(new_prim_group_dn));
1386         if (el == NULL) {
1387                 return LDB_ERR_UNWILLING_TO_PERFORM;
1388         }
1389
1390         /* Remove the "member" attribute on the new primary group */
1391         msg = ldb_msg_new(ac->msg);
1392         if (msg == NULL) {
1393                 return ldb_module_oom(ac->module);
1394         }
1395         msg->dn = new_prim_group_dn;
1396
1397         ret = samdb_msg_add_delval(ldb, msg, msg, "member",
1398                                    ldb_dn_get_linearized(ac->msg->dn));
1399         if (ret != LDB_SUCCESS) {
1400                 return ret;
1401         }
1402
1403         ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE, ac->req);
1404         if (ret != LDB_SUCCESS) {
1405                 return ret;
1406         }
1407         talloc_free(msg);
1408
1409         /* Add a "member" attribute for the previous primary group */
1410         msg = ldb_msg_new(ac->msg);
1411         if (msg == NULL) {
1412                 return ldb_module_oom(ac->module);
1413         }
1414         msg->dn = prev_prim_group_dn;
1415
1416         ret = samdb_msg_add_addval(ldb, msg, msg, "member",
1417                                    ldb_dn_get_linearized(ac->msg->dn));
1418         if (ret != LDB_SUCCESS) {
1419                 return ret;
1420         }
1421
1422         ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE, ac->req);
1423         if (ret != LDB_SUCCESS) {
1424                 return ret;
1425         }
1426         talloc_free(msg);
1427
1428         return LDB_SUCCESS;
1429 }
1430
1431 static int samldb_prim_group_trigger(struct samldb_ctx *ac)
1432 {
1433         int ret;
1434
1435         if (ac->req->operation == LDB_ADD) {
1436                 ret = samldb_prim_group_set(ac);
1437         } else {
1438                 ret = samldb_prim_group_change(ac);
1439         }
1440
1441         return ret;
1442 }
1443
1444
1445 /**
1446  * This function is called on LDB modify operations. It performs some additions/
1447  * replaces on the current LDB message when "userAccountControl" changes.
1448  */
1449 static int samldb_user_account_control_change(struct samldb_ctx *ac)
1450 {
1451         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1452         uint32_t user_account_control, old_user_account_control, account_type;
1453         struct ldb_message_element *el;
1454         struct ldb_message *tmp_msg;
1455         int ret;
1456         struct ldb_result *res;
1457         const char * const attrs[] = { "userAccountControl", "objectClass",
1458                                        "lockoutTime", NULL };
1459         unsigned int i;
1460         bool is_computer = false, uac_generated = false;
1461
1462         el = dsdb_get_single_valued_attr(ac->msg, "userAccountControl",
1463                                          ac->req->operation);
1464         if (el == NULL) {
1465                 /* we are not affected */
1466                 return LDB_SUCCESS;
1467         }
1468
1469         /* Create a temporary message for fetching the "userAccountControl" */
1470         tmp_msg = ldb_msg_new(ac->msg);
1471         if (tmp_msg == NULL) {
1472                 return ldb_module_oom(ac->module);
1473         }
1474         ret = ldb_msg_add(tmp_msg, el, 0);
1475         if (ret != LDB_SUCCESS) {
1476                 return ret;
1477         }
1478         user_account_control = ldb_msg_find_attr_as_uint(tmp_msg,
1479                                                          "userAccountControl",
1480                                                          0);
1481         talloc_free(tmp_msg);
1482
1483         /* Temporary duplicate accounts aren't allowed */
1484         if ((user_account_control & UF_TEMP_DUPLICATE_ACCOUNT) != 0) {
1485                 return LDB_ERR_OTHER;
1486         }
1487
1488         /* Fetch the old "userAccountControl" and "objectClass" */
1489         ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, attrs,
1490                                     DSDB_FLAG_NEXT_MODULE, ac->req);
1491         if (ret != LDB_SUCCESS) {
1492                 return ret;
1493         }
1494         old_user_account_control = ldb_msg_find_attr_as_uint(res->msgs[0], "userAccountControl", 0);
1495         if (old_user_account_control == 0) {
1496                 return ldb_operr(ldb);
1497         }
1498         el = ldb_msg_find_element(res->msgs[0], "objectClass");
1499         if (el == NULL) {
1500                 return ldb_operr(ldb);
1501         }
1502
1503         /* When we do not have objectclass "computer" we cannot switch to a (read-only) DC */
1504         for (i = 0; i < el->num_values; i++) {
1505                 if (ldb_attr_cmp((char *)el->values[i].data, "computer") == 0) {
1506                         is_computer = true;
1507                         break;
1508                 }
1509         }
1510         if (!is_computer &&
1511             (user_account_control & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT))) {
1512                 ldb_set_errstring(ldb,
1513                                   "samldb: Requested account type does need objectclass 'computer'!");
1514                 return LDB_ERR_UNWILLING_TO_PERFORM;
1515         }
1516
1517         /*
1518          * The functions "ds_uf2atype" and "ds_uf2prim_group_rid" are used as
1519          * detectors for account type changes.
1520          * So if the account type does change then we need to adjust the
1521          * "sAMAccountType", the "isCriticalSystemObject" and the
1522          * "primaryGroupID" attribute.
1523          */
1524         if ((ds_uf2atype(user_account_control)
1525              == ds_uf2atype(old_user_account_control)) &&
1526             (ds_uf2prim_group_rid(user_account_control)
1527              == ds_uf2prim_group_rid(old_user_account_control))) {
1528                 return LDB_SUCCESS;
1529         }
1530
1531         account_type = ds_uf2atype(user_account_control);
1532         if (account_type == 0) {
1533                 /*
1534                  * When there is no account type embedded in "userAccountControl"
1535                  * fall back to default "UF_NORMAL_ACCOUNT".
1536                  */
1537                 if (user_account_control == 0) {
1538                         ldb_set_errstring(ldb,
1539                                           "samldb: Invalid user account control value!");
1540                         return LDB_ERR_UNWILLING_TO_PERFORM;
1541                 }
1542
1543                 user_account_control |= UF_NORMAL_ACCOUNT;
1544                 uac_generated = true;
1545                 account_type = ATYPE_NORMAL_ACCOUNT;
1546         }
1547         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "sAMAccountType",
1548                                  account_type);
1549         if (ret != LDB_SUCCESS) {
1550                 return ret;
1551         }
1552         el = ldb_msg_find_element(ac->msg, "sAMAccountType");
1553         el->flags = LDB_FLAG_MOD_REPLACE;
1554
1555         /* As per MS-SAMR 3.1.1.8.10 these flags have not to be set */
1556         if ((user_account_control & UF_LOCKOUT) != 0) {
1557                 /* "lockoutTime" reset as per MS-SAMR 3.1.1.8.10 */
1558                 uint64_t lockout_time = ldb_msg_find_attr_as_uint64(res->msgs[0],
1559                                                                     "lockoutTime",
1560                                                                     0);
1561                 if (lockout_time != 0) {
1562                         ldb_msg_remove_attr(ac->msg, "lockoutTime");
1563                         ret = samdb_msg_add_uint64(ldb, ac->msg, ac->msg,
1564                                                    "lockoutTime", (NTTIME)0);
1565                         if (ret != LDB_SUCCESS) {
1566                                 return ret;
1567                         }
1568                         el = ldb_msg_find_element(ac->msg, "lockoutTime");
1569                         el->flags = LDB_FLAG_MOD_REPLACE;
1570                 }
1571
1572                 user_account_control &= ~UF_LOCKOUT;
1573                 uac_generated = true;
1574         }
1575         if ((user_account_control & UF_PASSWORD_EXPIRED) != 0) {
1576                 /* "pwdLastSet" reset as password expiration has been forced  */
1577                 ldb_msg_remove_attr(ac->msg, "pwdLastSet");
1578                 ret = samdb_msg_add_uint64(ldb, ac->msg, ac->msg, "pwdLastSet",
1579                                            (NTTIME)0);
1580                 if (ret != LDB_SUCCESS) {
1581                         return ret;
1582                 }
1583                 el = ldb_msg_find_element(ac->msg, "pwdLastSet");
1584                 el->flags = LDB_FLAG_MOD_REPLACE;
1585
1586                 user_account_control &= ~UF_PASSWORD_EXPIRED;
1587                 uac_generated = true;
1588         }
1589
1590         /* "isCriticalSystemObject" might be set/changed */
1591         if (user_account_control
1592             & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
1593                 ret = ldb_msg_add_string(ac->msg, "isCriticalSystemObject",
1594                                          "TRUE");
1595                 if (ret != LDB_SUCCESS) {
1596                         return ret;
1597                 }
1598                 el = ldb_msg_find_element(ac->msg,
1599                                            "isCriticalSystemObject");
1600                 el->flags = LDB_FLAG_MOD_REPLACE;
1601         } else if (user_account_control & UF_WORKSTATION_TRUST_ACCOUNT) {
1602                 ret = ldb_msg_add_string(ac->msg, "isCriticalSystemObject",
1603                                          "FALSE");
1604                 if (ret != LDB_SUCCESS) {
1605                         return ret;
1606                 }
1607                 el = ldb_msg_find_element(ac->msg,
1608                                            "isCriticalSystemObject");
1609                 el->flags = LDB_FLAG_MOD_REPLACE;
1610         }
1611
1612         if (!ldb_msg_find_element(ac->msg, "primaryGroupID")) {
1613                 uint32_t rid = ds_uf2prim_group_rid(user_account_control);
1614
1615                 /* Older AD deployments don't know about the RODC group */
1616                 if (rid == DOMAIN_RID_READONLY_DCS) {
1617                         ret = samldb_prim_group_tester(ac, rid);
1618                         if (ret != LDB_SUCCESS) {
1619                                 return ret;
1620                         }
1621                 }
1622
1623                 ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
1624                                          "primaryGroupID", rid);
1625                 if (ret != LDB_SUCCESS) {
1626                         return ret;
1627                 }
1628                 el = ldb_msg_find_element(ac->msg,
1629                                            "primaryGroupID");
1630                 el->flags = LDB_FLAG_MOD_REPLACE;
1631         }
1632
1633         /* Propagate eventual "userAccountControl" attribute changes */
1634         if (uac_generated) {
1635                 char *tempstr = talloc_asprintf(ac->msg, "%d",
1636                                                 user_account_control);
1637                 if (tempstr == NULL) {
1638                         return ldb_module_oom(ac->module);
1639                 }
1640
1641                 /* Overwrite "userAccountControl" correctly */
1642                 el = dsdb_get_single_valued_attr(ac->msg, "userAccountControl",
1643                                                  ac->req->operation);
1644                 el->values[0].data = (uint8_t *) tempstr;
1645                 el->values[0].length = strlen(tempstr);
1646         }
1647
1648         return LDB_SUCCESS;
1649 }
1650
1651 static int samldb_group_type_change(struct samldb_ctx *ac)
1652 {
1653         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1654         uint32_t group_type, old_group_type, account_type;
1655         struct ldb_message_element *el;
1656         struct ldb_message *tmp_msg;
1657         int ret;
1658         struct ldb_result *res;
1659         const char * const attrs[] = { "groupType", NULL };
1660
1661         el = dsdb_get_single_valued_attr(ac->msg, "groupType",
1662                                          ac->req->operation);
1663         if (el == NULL) {
1664                 /* we are not affected */
1665                 return LDB_SUCCESS;
1666         }
1667
1668         /* Create a temporary message for fetching the "groupType" */
1669         tmp_msg = ldb_msg_new(ac->msg);
1670         if (tmp_msg == NULL) {
1671                 return ldb_module_oom(ac->module);
1672         }
1673         ret = ldb_msg_add(tmp_msg, el, 0);
1674         if (ret != LDB_SUCCESS) {
1675                 return ret;
1676         }
1677         group_type = ldb_msg_find_attr_as_uint(tmp_msg, "groupType", 0);
1678         talloc_free(tmp_msg);
1679
1680         ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, attrs,
1681                                     DSDB_FLAG_NEXT_MODULE |
1682                                     DSDB_SEARCH_SHOW_DELETED, ac->req);
1683         if (ret != LDB_SUCCESS) {
1684                 return ret;
1685         }
1686         old_group_type = ldb_msg_find_attr_as_uint(res->msgs[0], "groupType", 0);
1687         if (old_group_type == 0) {
1688                 return ldb_operr(ldb);
1689         }
1690
1691         /* Group type switching isn't so easy as it seems: We can only
1692          * change in this directions: global <-> universal <-> local
1693          * On each step also the group type itself
1694          * (security/distribution) is variable. */
1695
1696         if (ldb_request_get_control(ac->req, LDB_CONTROL_PROVISION_OID) == NULL) {
1697                 switch (group_type) {
1698                 case GTYPE_SECURITY_GLOBAL_GROUP:
1699                 case GTYPE_DISTRIBUTION_GLOBAL_GROUP:
1700                         /* change to "universal" allowed */
1701                         if ((old_group_type == GTYPE_SECURITY_DOMAIN_LOCAL_GROUP) ||
1702                         (old_group_type == GTYPE_DISTRIBUTION_DOMAIN_LOCAL_GROUP)) {
1703                                 ldb_set_errstring(ldb,
1704                                         "samldb: Change from security/distribution local group forbidden!");
1705                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1706                         }
1707                 break;
1708
1709                 case GTYPE_SECURITY_UNIVERSAL_GROUP:
1710                 case GTYPE_DISTRIBUTION_UNIVERSAL_GROUP:
1711                         /* each change allowed */
1712                 break;
1713                 case GTYPE_SECURITY_DOMAIN_LOCAL_GROUP:
1714                 case GTYPE_DISTRIBUTION_DOMAIN_LOCAL_GROUP:
1715                         /* change to "universal" allowed */
1716                         if ((old_group_type == GTYPE_SECURITY_GLOBAL_GROUP) ||
1717                         (old_group_type == GTYPE_DISTRIBUTION_GLOBAL_GROUP)) {
1718                                 ldb_set_errstring(ldb,
1719                                         "samldb: Change from security/distribution global group forbidden!");
1720                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1721                         }
1722                 break;
1723
1724                 case GTYPE_SECURITY_BUILTIN_LOCAL_GROUP:
1725                 default:
1726                         /* we don't allow this "groupType" values */
1727                         return LDB_ERR_UNWILLING_TO_PERFORM;
1728                 break;
1729                 }
1730         }
1731
1732         account_type =  ds_gtype2atype(group_type);
1733         if (account_type == 0) {
1734                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
1735                 return LDB_ERR_UNWILLING_TO_PERFORM;
1736         }
1737         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "sAMAccountType",
1738                                  account_type);
1739         if (ret != LDB_SUCCESS) {
1740                 return ret;
1741         }
1742         el = ldb_msg_find_element(ac->msg, "sAMAccountType");
1743         el->flags = LDB_FLAG_MOD_REPLACE;
1744
1745         return LDB_SUCCESS;
1746 }
1747
1748 static int samldb_sam_accountname_check(struct samldb_ctx *ac)
1749 {
1750         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1751         const char * const no_attrs[] = { NULL };
1752         struct ldb_result *res;
1753         const char *sam_accountname, *enc_str;
1754         struct ldb_message_element *el;
1755         struct ldb_message *tmp_msg;
1756         int ret;
1757
1758         el = dsdb_get_single_valued_attr(ac->msg, "sAMAccountName",
1759                                          ac->req->operation);
1760         if (el == NULL) {
1761                 /* we are not affected */
1762                 return LDB_SUCCESS;
1763         }
1764
1765         /* Create a temporary message for fetching the "sAMAccountName" */
1766         tmp_msg = ldb_msg_new(ac->msg);
1767         if (tmp_msg == NULL) {
1768                 return ldb_module_oom(ac->module);
1769         }
1770         ret = ldb_msg_add(tmp_msg, el, 0);
1771         if (ret != LDB_SUCCESS) {
1772                 return ret;
1773         }
1774
1775         /* We must not steal the original string, it belongs to the caller! */
1776         sam_accountname = talloc_strdup(ac,
1777                                         ldb_msg_find_attr_as_string(tmp_msg, "sAMAccountName", NULL));
1778         talloc_free(tmp_msg);
1779
1780         if (sam_accountname == NULL) {
1781                 /* The "sAMAccountName" cannot be nothing */
1782                 ldb_set_errstring(ldb,
1783                                   "samldb: Empty account names aren't allowed!");
1784                 return LDB_ERR_UNWILLING_TO_PERFORM;
1785         }
1786
1787         enc_str = ldb_binary_encode_string(ac, sam_accountname);
1788         if (enc_str == NULL) {
1789                 return ldb_module_oom(ac->module);
1790         }
1791
1792         /* Make sure that a "sAMAccountName" is only used once */
1793
1794         ret = dsdb_module_search(ac->module, ac, &res,
1795                                  ldb_get_default_basedn(ldb),
1796                                  LDB_SCOPE_SUBTREE, no_attrs,
1797                                  DSDB_FLAG_NEXT_MODULE, ac->req,
1798                                  "(sAMAccountName=%s)", enc_str);
1799         if (ret != LDB_SUCCESS) {
1800                 return ret;
1801         }
1802         if (res->count > 1) {
1803                 return ldb_operr(ldb);
1804         } else if (res->count == 1) {
1805                 if (ldb_dn_compare(res->msgs[0]->dn, ac->msg->dn) != 0) {
1806                         ldb_asprintf_errstring(ldb,
1807                                                "samldb: Account name (sAMAccountName) '%s' already in use!",
1808                                                sam_accountname);
1809                         return LDB_ERR_ENTRY_ALREADY_EXISTS;
1810                 }
1811         }
1812         talloc_free(res);
1813
1814         return LDB_SUCCESS;
1815 }
1816
1817 static int samldb_member_check(struct samldb_ctx *ac)
1818 {
1819         const char * const attrs[] = { "objectSid", NULL };
1820         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1821         struct ldb_message_element *el;
1822         struct ldb_dn *member_dn;
1823         struct dom_sid *sid;
1824         struct ldb_result *res;
1825         struct dom_sid *group_sid;
1826         unsigned int i, j;
1827         int ret;
1828
1829         /* Fetch information from the existing object */
1830
1831         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1832                                  DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED, ac->req, NULL);
1833         if (ret != LDB_SUCCESS) {
1834                 return ret;
1835         }
1836         if (res->count != 1) {
1837                 return ldb_operr(ldb);
1838         }
1839
1840         group_sid = samdb_result_dom_sid(res, res->msgs[0], "objectSid");
1841         if (group_sid == NULL) {
1842                 return ldb_operr(ldb);
1843         }
1844
1845         /* We've to walk over all modification entries and consider the "member"
1846          * ones. */
1847         for (i = 0; i < ac->msg->num_elements; i++) {
1848                 if (ldb_attr_cmp(ac->msg->elements[i].name, "member") != 0) {
1849                         continue;
1850                 }
1851
1852                 el = &ac->msg->elements[i];
1853                 for (j = 0; j < el->num_values; j++) {
1854                         struct ldb_result *group_res;
1855                         const char *group_attrs[] = { "primaryGroupID" , NULL };
1856                         uint32_t prim_group_rid;
1857
1858                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
1859                                 /* Deletes will be handled in
1860                                  * repl_meta_data, and deletes not
1861                                  * matching a member will return
1862                                  * LDB_ERR_UNWILLING_TO_PERFORM
1863                                  * there */
1864                                 continue;
1865                         }
1866
1867                         member_dn = ldb_dn_from_ldb_val(ac, ldb,
1868                                                         &el->values[j]);
1869                         if (!ldb_dn_validate(member_dn)) {
1870                                 return ldb_operr(ldb);
1871                         }
1872
1873                         /* Denies to add "member"s to groups which are primary
1874                          * ones for them - in this case return
1875                          * ERR_ENTRY_ALREADY_EXISTS. */
1876
1877                         ret = dsdb_module_search_dn(ac->module, ac, &group_res,
1878                                                     member_dn, group_attrs,
1879                                                     DSDB_FLAG_NEXT_MODULE, ac->req);
1880                         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1881                                 /* member DN doesn't exist yet */
1882                                 continue;
1883                         }
1884                         if (ret != LDB_SUCCESS) {
1885                                 return ret;
1886                         }
1887                         prim_group_rid = ldb_msg_find_attr_as_uint(group_res->msgs[0], "primaryGroupID", (uint32_t)-1);
1888                         if (prim_group_rid == (uint32_t) -1) {
1889                                 /* the member hasn't to be a user account ->
1890                                  * therefore no check needed in this case. */
1891                                 continue;
1892                         }
1893
1894                         sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb),
1895                                               prim_group_rid);
1896                         if (sid == NULL) {
1897                                 return ldb_operr(ldb);
1898                         }
1899
1900                         if (dom_sid_equal(group_sid, sid)) {
1901                                 ldb_asprintf_errstring(ldb,
1902                                                        "samldb: member %s already set via primaryGroupID %u",
1903                                                        ldb_dn_get_linearized(member_dn), prim_group_rid);
1904                                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
1905                         }
1906                 }
1907         }
1908
1909         talloc_free(res);
1910
1911         return LDB_SUCCESS;
1912 }
1913
1914 /* SAM objects have special rules regarding the "description" attribute on
1915  * modify operations. */
1916 static int samldb_description_check(struct samldb_ctx *ac, bool *modified)
1917 {
1918         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1919         const char * const attrs[] = { "objectClass", "description", NULL };
1920         struct ldb_result *res;
1921         unsigned int i;
1922         int ret;
1923
1924         /* Fetch information from the existing object */
1925         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1926                                  DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED, ac->req,
1927                                  "(|(objectclass=user)(objectclass=group)(objectclass=samDomain)(objectclass=samServer))");
1928         if (ret != LDB_SUCCESS) {
1929                 /* don't treat it specially ... let normal error codes
1930                    happen from other places */
1931                 ldb_reset_err_string(ldb);
1932                 return LDB_SUCCESS;
1933         }
1934         if (res->count == 0) {
1935                 /* we didn't match the filter */
1936                 talloc_free(res);
1937                 return LDB_SUCCESS;
1938         }
1939
1940         /* We've to walk over all modification entries and consider the
1941          * "description" ones. */
1942         for (i = 0; i < ac->msg->num_elements; i++) {
1943                 if (ldb_attr_cmp(ac->msg->elements[i].name, "description") == 0) {
1944                         ac->msg->elements[i].flags |= LDB_FLAG_INTERNAL_FORCE_SINGLE_VALUE_CHECK;
1945                         *modified = true;
1946                 }
1947         }
1948
1949         talloc_free(res);
1950
1951         return LDB_SUCCESS;
1952 }
1953
1954 /* This trigger adapts the "servicePrincipalName" attributes if the
1955  * "dNSHostName" and/or "sAMAccountName" attribute change(s) */
1956 static int samldb_service_principal_names_change(struct samldb_ctx *ac)
1957 {
1958         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1959         struct ldb_message_element *el = NULL, *el2 = NULL;
1960         struct ldb_message *msg;
1961         const char * const attrs[] = { "servicePrincipalName", NULL };
1962         struct ldb_result *res;
1963         const char *dns_hostname = NULL, *old_dns_hostname = NULL,
1964                    *sam_accountname = NULL, *old_sam_accountname = NULL;
1965         unsigned int i, j;
1966         int ret;
1967
1968         el = dsdb_get_single_valued_attr(ac->msg, "dNSHostName",
1969                                          ac->req->operation);
1970         el2 = dsdb_get_single_valued_attr(ac->msg, "sAMAccountName",
1971                                           ac->req->operation);
1972         if ((el == NULL) && (el2 == NULL)) {
1973                 /* we are not affected */
1974                 return LDB_SUCCESS;
1975         }
1976
1977         /* Create a temporary message for fetching the "dNSHostName" */
1978         if (el != NULL) {
1979                 const char *dns_attrs[] = { "dNSHostName", NULL };
1980                 msg = ldb_msg_new(ac->msg);
1981                 if (msg == NULL) {
1982                         return ldb_module_oom(ac->module);
1983                 }
1984                 ret = ldb_msg_add(msg, el, 0);
1985                 if (ret != LDB_SUCCESS) {
1986                         return ret;
1987                 }
1988                 dns_hostname = talloc_strdup(ac,
1989                                              ldb_msg_find_attr_as_string(msg, "dNSHostName", NULL));
1990                 if (dns_hostname == NULL) {
1991                         return ldb_module_oom(ac->module);
1992                 }
1993
1994                 talloc_free(msg);
1995
1996                 ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn,
1997                                             dns_attrs, DSDB_FLAG_NEXT_MODULE, ac->req);
1998                 if (ret == LDB_SUCCESS) {
1999                         old_dns_hostname = ldb_msg_find_attr_as_string(res->msgs[0], "dNSHostName", NULL);
2000                 }
2001         }
2002
2003         /* Create a temporary message for fetching the "sAMAccountName" */
2004         if (el2 != NULL) {
2005                 char *tempstr, *tempstr2;
2006                 const char *acct_attrs[] = { "sAMAccountName", NULL };
2007
2008                 msg = ldb_msg_new(ac->msg);
2009                 if (msg == NULL) {
2010                         return ldb_module_oom(ac->module);
2011                 }
2012                 ret = ldb_msg_add(msg, el2, 0);
2013                 if (ret != LDB_SUCCESS) {
2014                         return ret;
2015                 }
2016                 tempstr = talloc_strdup(ac,
2017                                         ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL));
2018                 talloc_free(msg);
2019
2020                 ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, acct_attrs,
2021                                             DSDB_FLAG_NEXT_MODULE, ac->req);
2022                 if (ret == LDB_SUCCESS) {
2023                         tempstr2 = talloc_strdup(ac,
2024                                                  ldb_msg_find_attr_as_string(res->msgs[0],
2025                                                                              "sAMAccountName", NULL));
2026                 }
2027
2028
2029                 /* The "sAMAccountName" needs some additional trimming: we need
2030                  * to remove the trailing "$"s if they exist. */
2031                 if ((tempstr != NULL) && (tempstr[0] != '\0') &&
2032                     (tempstr[strlen(tempstr) - 1] == '$')) {
2033                         tempstr[strlen(tempstr) - 1] = '\0';
2034                 }
2035                 if ((tempstr2 != NULL) && (tempstr2[0] != '\0') &&
2036                     (tempstr2[strlen(tempstr2) - 1] == '$')) {
2037                         tempstr2[strlen(tempstr2) - 1] = '\0';
2038                 }
2039                 sam_accountname = tempstr;
2040                 old_sam_accountname = tempstr2;
2041         }
2042
2043         if (old_dns_hostname == NULL) {
2044                 /* we cannot change when the old name is unknown */
2045                 dns_hostname = NULL;
2046         }
2047         if ((old_dns_hostname != NULL) && (dns_hostname != NULL) &&
2048             (strcasecmp_m(old_dns_hostname, dns_hostname) == 0)) {
2049                 /* The "dNSHostName" didn't change */
2050                 dns_hostname = NULL;
2051         }
2052
2053         if (old_sam_accountname == NULL) {
2054                 /* we cannot change when the old name is unknown */
2055                 sam_accountname = NULL;
2056         }
2057         if ((old_sam_accountname != NULL) && (sam_accountname != NULL) &&
2058             (strcasecmp_m(old_sam_accountname, sam_accountname) == 0)) {
2059                 /* The "sAMAccountName" didn't change */
2060                 sam_accountname = NULL;
2061         }
2062
2063         if ((dns_hostname == NULL) && (sam_accountname == NULL)) {
2064                 /* Well, there are information missing (old name(s)) or the
2065                  * names didn't change. We've nothing to do and can exit here */
2066                 return LDB_SUCCESS;
2067         }
2068
2069         /* Potential "servicePrincipalName" changes in the same request have to
2070          * be handled before the update (Windows behaviour). */
2071         el = ldb_msg_find_element(ac->msg, "servicePrincipalName");
2072         if (el != NULL) {
2073                 msg = ldb_msg_new(ac->msg);
2074                 if (msg == NULL) {
2075                         return ldb_module_oom(ac->module);
2076                 }
2077                 msg->dn = ac->msg->dn;
2078
2079                 do {
2080                         ret = ldb_msg_add(msg, el, el->flags);
2081                         if (ret != LDB_SUCCESS) {
2082                                 return ret;
2083                         }
2084
2085                         ldb_msg_remove_element(ac->msg, el);
2086
2087                         el = ldb_msg_find_element(ac->msg,
2088                                                   "servicePrincipalName");
2089                 } while (el != NULL);
2090
2091                 ret = dsdb_module_modify(ac->module, msg,
2092                                          DSDB_FLAG_NEXT_MODULE, ac->req);
2093                 if (ret != LDB_SUCCESS) {
2094                         return ret;
2095                 }
2096                 talloc_free(msg);
2097         }
2098
2099         /* Fetch the "servicePrincipalName"s if any */
2100         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
2101                                  DSDB_FLAG_NEXT_MODULE, ac->req, NULL);
2102         if (ret != LDB_SUCCESS) {
2103                 return ret;
2104         }
2105         if ((res->count != 1) || (res->msgs[0]->num_elements > 1)) {
2106                 return ldb_operr(ldb);
2107         }
2108
2109         if (res->msgs[0]->num_elements == 1) {
2110                 /*
2111                  * Yes, we do have "servicePrincipalName"s. First we update them
2112                  * locally, that means we do always substitute the current
2113                  * "dNSHostName" with the new one and/or "sAMAccountName"
2114                  * without "$" with the new one and then we append the
2115                  * modified "servicePrincipalName"s as a message element
2116                  * replace to the modification request (Windows behaviour). We
2117                  * need also to make sure that the values remain case-
2118                  * insensitively unique.
2119                  */
2120
2121                 ret = ldb_msg_add_empty(ac->msg, "servicePrincipalName",
2122                                         LDB_FLAG_MOD_REPLACE, &el);
2123                 if (ret != LDB_SUCCESS) {
2124                         return ret;
2125                 }
2126
2127                 for (i = 0; i < res->msgs[0]->elements[0].num_values; i++) {
2128                         char *old_str, *new_str, *pos;
2129                         const char *tok;
2130                         struct ldb_val *vals;
2131                         bool found = false;
2132
2133                         old_str = (char *)
2134                                 res->msgs[0]->elements[0].values[i].data;
2135
2136                         new_str = talloc_strdup(ac->msg,
2137                                                 strtok_r(old_str, "/", &pos));
2138                         if (new_str == NULL) {
2139                                 return ldb_module_oom(ac->module);
2140                         }
2141
2142                         while ((tok = strtok_r(NULL, "/", &pos)) != NULL) {
2143                                 if ((dns_hostname != NULL) &&
2144                                     (strcasecmp_m(tok, old_dns_hostname) == 0)) {
2145                                         tok = dns_hostname;
2146                                 }
2147                                 if ((sam_accountname != NULL) &&
2148                                     (strcasecmp_m(tok, old_sam_accountname) == 0)) {
2149                                         tok = sam_accountname;
2150                                 }
2151
2152                                 new_str = talloc_asprintf(ac->msg, "%s/%s",
2153                                                           new_str, tok);
2154                                 if (new_str == NULL) {
2155                                         return ldb_module_oom(ac->module);
2156                                 }
2157                         }
2158
2159                         /* Uniqueness check */
2160                         for (j = 0; (!found) && (j < el->num_values); j++) {
2161                                 if (strcasecmp_m((char *)el->values[j].data,
2162                                                new_str) == 0) {
2163                                         found = true;
2164                                 }
2165                         }
2166                         if (found) {
2167                                 continue;
2168                         }
2169
2170                         /*
2171                          * append the new "servicePrincipalName" -
2172                          * code derived from ldb_msg_add_value().
2173                          *
2174                          * Open coded to make it clear that we must
2175                          * append to the MOD_REPLACE el created above.
2176                          */
2177                         vals = talloc_realloc(ac->msg, el->values,
2178                                               struct ldb_val,
2179                                               el->num_values + 1);
2180                         if (vals == NULL) {
2181                                 return ldb_module_oom(ac->module);
2182                         }
2183                         el->values = vals;
2184                         el->values[el->num_values] = data_blob_string_const(new_str);
2185                         ++(el->num_values);
2186                 }
2187         }
2188
2189         talloc_free(res);
2190
2191         return LDB_SUCCESS;
2192 }
2193
2194 /* This checks the "fSMORoleOwner" attributes */
2195 static int samldb_fsmo_role_owner_check(struct samldb_ctx *ac)
2196 {
2197         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
2198         const char * const no_attrs[] = { NULL };
2199         struct ldb_message_element *el;
2200         struct ldb_message *tmp_msg;
2201         struct ldb_dn *res_dn;
2202         struct ldb_result *res;
2203         int ret;
2204
2205         el = dsdb_get_single_valued_attr(ac->msg, "fSMORoleOwner",
2206                                          ac->req->operation);
2207         if (el == NULL) {
2208                 /* we are not affected */
2209                 return LDB_SUCCESS;
2210         }
2211
2212         /* Create a temporary message for fetching the "fSMORoleOwner" */
2213         tmp_msg = ldb_msg_new(ac->msg);
2214         if (tmp_msg == NULL) {
2215                 return ldb_module_oom(ac->module);
2216         }
2217         ret = ldb_msg_add(tmp_msg, el, 0);
2218         if (ret != LDB_SUCCESS) {
2219                 return ret;
2220         }
2221         res_dn = ldb_msg_find_attr_as_dn(ldb, ac, tmp_msg, "fSMORoleOwner");
2222         talloc_free(tmp_msg);
2223
2224         if (res_dn == NULL) {
2225                 ldb_set_errstring(ldb,
2226                                   "samldb: 'fSMORoleOwner' attributes have to reference 'nTDSDSA' entries!");
2227                 if (ac->req->operation == LDB_ADD) {
2228                         return LDB_ERR_CONSTRAINT_VIOLATION;
2229                 } else {
2230                         return LDB_ERR_UNWILLING_TO_PERFORM;
2231                 }
2232         }
2233
2234         /* Fetched DN has to reference a "nTDSDSA" entry */
2235         ret = dsdb_module_search(ac->module, ac, &res, res_dn, LDB_SCOPE_BASE,
2236                                  no_attrs,
2237                                  DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED,
2238                                  ac->req, "(objectClass=nTDSDSA)");
2239         if (ret != LDB_SUCCESS) {
2240                 return ret;
2241         }
2242         if (res->count != 1) {
2243                 ldb_set_errstring(ldb,
2244                                   "samldb: 'fSMORoleOwner' attributes have to reference 'nTDSDSA' entries!");
2245                 return LDB_ERR_UNWILLING_TO_PERFORM;
2246         }
2247
2248         talloc_free(res);
2249
2250         return LDB_SUCCESS;
2251 }
2252
2253
2254 /* add */
2255 static int samldb_add(struct ldb_module *module, struct ldb_request *req)
2256 {
2257         struct ldb_context *ldb;
2258         struct samldb_ctx *ac;
2259         struct ldb_message_element *el;
2260         int ret;
2261
2262         ldb = ldb_module_get_ctx(module);
2263         ldb_debug(ldb, LDB_DEBUG_TRACE, "samldb_add\n");
2264
2265         /* do not manipulate our control entries */
2266         if (ldb_dn_is_special(req->op.add.message->dn)) {
2267                 return ldb_next_request(module, req);
2268         }
2269
2270         ac = samldb_ctx_init(module, req);
2271         if (ac == NULL) {
2272                 return ldb_operr(ldb);
2273         }
2274
2275         /* build the new msg */
2276         ac->msg = ldb_msg_copy_shallow(ac, req->op.add.message);
2277         if (ac->msg == NULL) {
2278                 talloc_free(ac);
2279                 ldb_debug(ldb, LDB_DEBUG_FATAL,
2280                           "samldb_add: ldb_msg_copy_shallow failed!\n");
2281                 return ldb_operr(ldb);
2282         }
2283
2284         el = ldb_msg_find_element(ac->msg, "fSMORoleOwner");
2285         if (el != NULL) {
2286                 ret = samldb_fsmo_role_owner_check(ac);
2287                 if (ret != LDB_SUCCESS) {
2288                         return ret;
2289                 }
2290         }
2291
2292         if (samdb_find_attribute(ldb, ac->msg,
2293                                  "objectclass", "user") != NULL) {
2294                 ac->type = SAMLDB_TYPE_USER;
2295
2296                 ret = samldb_prim_group_trigger(ac);
2297                 if (ret != LDB_SUCCESS) {
2298                         return ret;
2299                 }
2300
2301                 ret = samldb_objectclass_trigger(ac);
2302                 if (ret != LDB_SUCCESS) {
2303                         return ret;
2304                 }
2305
2306                 return samldb_fill_object(ac);
2307         }
2308
2309         if (samdb_find_attribute(ldb, ac->msg,
2310                                  "objectclass", "group") != NULL) {
2311                 ac->type = SAMLDB_TYPE_GROUP;
2312
2313                 ret = samldb_objectclass_trigger(ac);
2314                 if (ret != LDB_SUCCESS) {
2315                         return ret;
2316                 }
2317
2318                 return samldb_fill_object(ac);
2319         }
2320
2321         /* perhaps a foreignSecurityPrincipal? */
2322         if (samdb_find_attribute(ldb, ac->msg,
2323                                  "objectclass",
2324                                  "foreignSecurityPrincipal") != NULL) {
2325                 return samldb_fill_foreignSecurityPrincipal_object(ac);
2326         }
2327
2328         if (samdb_find_attribute(ldb, ac->msg,
2329                                  "objectclass", "classSchema") != NULL) {
2330                 ret = samldb_schema_info_update(ac);
2331                 if (ret != LDB_SUCCESS) {
2332                         talloc_free(ac);
2333                         return ret;
2334                 }
2335
2336                 ac->type = SAMLDB_TYPE_CLASS;
2337                 return samldb_fill_object(ac);
2338         }
2339
2340         if (samdb_find_attribute(ldb, ac->msg,
2341                                  "objectclass", "attributeSchema") != NULL) {
2342                 ret = samldb_schema_info_update(ac);
2343                 if (ret != LDB_SUCCESS) {
2344                         talloc_free(ac);
2345                         return ret;
2346                 }
2347
2348                 ac->type = SAMLDB_TYPE_ATTRIBUTE;
2349                 return samldb_fill_object(ac);
2350         }
2351
2352         talloc_free(ac);
2353
2354         /* nothing matched, go on */
2355         return ldb_next_request(module, req);
2356 }
2357
2358 /* modify */
2359 static int samldb_modify(struct ldb_module *module, struct ldb_request *req)
2360 {
2361         struct ldb_context *ldb;
2362         struct samldb_ctx *ac;
2363         struct ldb_message_element *el, *el2;
2364         bool modified = false;
2365         int ret;
2366
2367         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2368                 /* do not manipulate our control entries */
2369                 return ldb_next_request(module, req);
2370         }
2371
2372         ldb = ldb_module_get_ctx(module);
2373
2374         /* make sure that "objectSid" is not specified */
2375         el = ldb_msg_find_element(req->op.mod.message, "objectSid");
2376         if (el != NULL) {
2377                 if (ldb_request_get_control(req, LDB_CONTROL_PROVISION_OID) == NULL) {
2378                         ldb_set_errstring(ldb,
2379                                           "samldb: objectSid must not be specified!");
2380                         return LDB_ERR_UNWILLING_TO_PERFORM;
2381                 }
2382         }
2383         /* make sure that "sAMAccountType" is not specified */
2384         el = ldb_msg_find_element(req->op.mod.message, "sAMAccountType");
2385         if (el != NULL) {
2386                 ldb_set_errstring(ldb,
2387                                   "samldb: sAMAccountType must not be specified!");
2388                 return LDB_ERR_UNWILLING_TO_PERFORM;
2389         }
2390         /* make sure that "isCriticalSystemObject" is not specified */
2391         el = ldb_msg_find_element(req->op.mod.message, "isCriticalSystemObject");
2392         if (el != NULL) {
2393                 if (ldb_request_get_control(req, LDB_CONTROL_RELAX_OID) == NULL) {
2394                         ldb_set_errstring(ldb,
2395                                           "samldb: isCriticalSystemObject must not be specified!");
2396                         return LDB_ERR_UNWILLING_TO_PERFORM;
2397                 }
2398         }
2399
2400         /* msDS-IntId is not allowed to be modified
2401          * except when modification comes from replication */
2402         if (ldb_msg_find_element(req->op.mod.message, "msDS-IntId")) {
2403                 if (!ldb_request_get_control(req,
2404                                              DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
2405                         return LDB_ERR_CONSTRAINT_VIOLATION;
2406                 }
2407         }
2408
2409         ac = samldb_ctx_init(module, req);
2410         if (ac == NULL) {
2411                 return ldb_operr(ldb);
2412         }
2413
2414         /* build the new msg */
2415         ac->msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2416         if (ac->msg == NULL) {
2417                 talloc_free(ac);
2418                 ldb_debug(ldb, LDB_DEBUG_FATAL,
2419                           "samldb_modify: ldb_msg_copy_shallow failed!\n");
2420                 return ldb_operr(ldb);
2421         }
2422
2423         el = ldb_msg_find_element(ac->msg, "primaryGroupID");
2424         if (el != NULL) {
2425                 ret = samldb_prim_group_trigger(ac);
2426                 if (ret != LDB_SUCCESS) {
2427                         return ret;
2428                 }
2429         }
2430
2431         el = ldb_msg_find_element(ac->msg, "userAccountControl");
2432         if (el != NULL) {
2433                 modified = true;
2434                 ret = samldb_user_account_control_change(ac);
2435                 if (ret != LDB_SUCCESS) {
2436                         return ret;
2437                 }
2438         }
2439
2440         el = ldb_msg_find_element(ac->msg, "groupType");
2441         if (el != NULL) {
2442                 modified = true;
2443                 ret = samldb_group_type_change(ac);
2444                 if (ret != LDB_SUCCESS) {
2445                         return ret;
2446                 }
2447         }
2448
2449         el = ldb_msg_find_element(ac->msg, "sAMAccountName");
2450         if (el != NULL) {
2451                 ret = samldb_sam_accountname_check(ac);
2452                 if (ret != LDB_SUCCESS) {
2453                         return ret;
2454                 }
2455         }
2456
2457         el = ldb_msg_find_element(ac->msg, "member");
2458         if (el != NULL) {
2459                 ret = samldb_member_check(ac);
2460                 if (ret != LDB_SUCCESS) {
2461                         return ret;
2462                 }
2463         }
2464
2465         el = ldb_msg_find_element(ac->msg, "description");
2466         if (el != NULL) {
2467                 ret = samldb_description_check(ac, &modified);
2468                 if (ret != LDB_SUCCESS) {
2469                         return ret;
2470                 }
2471         }
2472
2473         el = ldb_msg_find_element(ac->msg, "dNSHostName");
2474         el2 = ldb_msg_find_element(ac->msg, "sAMAccountName");
2475         if ((el != NULL) || (el2 != NULL)) {
2476                 modified = true;
2477                 ret = samldb_service_principal_names_change(ac);
2478                 if (ret != LDB_SUCCESS) {
2479                         return ret;
2480                 }
2481         }
2482
2483         el = ldb_msg_find_element(ac->msg, "fSMORoleOwner");
2484         if (el != NULL) {
2485                 ret = samldb_fsmo_role_owner_check(ac);
2486                 if (ret != LDB_SUCCESS) {
2487                         return ret;
2488                 }
2489         }
2490
2491         if (modified) {
2492                 struct ldb_request *child_req;
2493
2494                 /* Now perform the real modifications as a child request */
2495                 ret = ldb_build_mod_req(&child_req, ldb, ac,
2496                                         ac->msg,
2497                                         req->controls,
2498                                         req, dsdb_next_callback,
2499                                         req);
2500                 LDB_REQ_SET_LOCATION(child_req);
2501                 if (ret != LDB_SUCCESS) {
2502                         return ret;
2503                 }
2504
2505                 return ldb_next_request(module, child_req);
2506         }
2507
2508         talloc_free(ac);
2509
2510         /* no change which interests us, go on */
2511         return ldb_next_request(module, req);
2512 }
2513
2514 /* delete */
2515
2516 static int samldb_prim_group_users_check(struct samldb_ctx *ac)
2517 {
2518         struct ldb_context *ldb;
2519         struct dom_sid *sid;
2520         uint32_t rid;
2521         NTSTATUS status;
2522         int ret;
2523         struct ldb_result *res;
2524         const char * const attrs[] = { "objectSid", "isDeleted", NULL };
2525         const char * const noattrs[] = { NULL };
2526
2527         ldb = ldb_module_get_ctx(ac->module);
2528
2529         /* Finds out the SID/RID of the SAM object */
2530         ret = dsdb_module_search_dn(ac->module, ac, &res, ac->req->op.del.dn,
2531                                         attrs,
2532                                         DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED,
2533                                         ac->req);
2534         if (ret != LDB_SUCCESS) {
2535                 return ret;
2536         }
2537
2538         if (ldb_msg_check_string_attribute(res->msgs[0], "isDeleted", "TRUE")) {
2539                 return LDB_SUCCESS;
2540         }
2541
2542         sid = samdb_result_dom_sid(ac, res->msgs[0], "objectSid");
2543         if (sid == NULL) {
2544                 /* No SID - it might not be a SAM object - therefore ok */
2545                 return LDB_SUCCESS;
2546         }
2547         status = dom_sid_split_rid(ac, sid, NULL, &rid);
2548         if (!NT_STATUS_IS_OK(status)) {
2549                 return ldb_operr(ldb);
2550         }
2551         if (rid == 0) {
2552                 /* Special object (security principal?) */
2553                 return LDB_SUCCESS;
2554         }
2555         /* do not allow deletion of well-known sids */
2556         if (rid < DSDB_SAMDB_MINIMUM_ALLOWED_RID &&
2557             (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID) == NULL)) {
2558                 return LDB_ERR_OTHER;
2559         }
2560
2561         /* Deny delete requests from groups which are primary ones */
2562         ret = dsdb_module_search(ac->module, ac, &res,
2563                                  ldb_get_default_basedn(ldb),
2564                                  LDB_SCOPE_SUBTREE, noattrs,
2565                                  DSDB_FLAG_NEXT_MODULE,
2566                                  ac->req,
2567                                  "(&(primaryGroupID=%u)(objectClass=user))", rid);
2568         if (ret != LDB_SUCCESS) {
2569                 return ret;
2570         }
2571         if (res->count > 0) {
2572                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
2573         }
2574
2575         return LDB_SUCCESS;
2576 }
2577
2578 static int samldb_delete(struct ldb_module *module, struct ldb_request *req)
2579 {
2580         struct samldb_ctx *ac;
2581         int ret;
2582
2583         if (ldb_dn_is_special(req->op.del.dn)) {
2584                 /* do not manipulate our control entries */
2585                 return ldb_next_request(module, req);
2586         }
2587
2588         ac = samldb_ctx_init(module, req);
2589         if (ac == NULL) {
2590                 return ldb_operr(ldb_module_get_ctx(module));
2591         }
2592
2593         ret = samldb_prim_group_users_check(ac);
2594         if (ret != LDB_SUCCESS) {
2595                 return ret;
2596         }
2597
2598         talloc_free(ac);
2599
2600         return ldb_next_request(module, req);
2601 }
2602
2603 /* extended */
2604
2605 static int samldb_extended_allocate_rid_pool(struct ldb_module *module, struct ldb_request *req)
2606 {
2607         struct ldb_context *ldb = ldb_module_get_ctx(module);
2608         struct dsdb_fsmo_extended_op *exop;
2609         int ret;
2610
2611         exop = talloc_get_type(req->op.extended.data,
2612                                struct dsdb_fsmo_extended_op);
2613         if (!exop) {
2614                 ldb_set_errstring(ldb,
2615                                   "samldb_extended_allocate_rid_pool: invalid extended data");
2616                 return LDB_ERR_PROTOCOL_ERROR;
2617         }
2618
2619         ret = ridalloc_allocate_rid_pool_fsmo(module, exop, req);
2620         if (ret != LDB_SUCCESS) {
2621                 return ret;
2622         }
2623
2624         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2625 }
2626
2627 static int samldb_extended(struct ldb_module *module, struct ldb_request *req)
2628 {
2629         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_ALLOCATE_RID_POOL) == 0) {
2630                 return samldb_extended_allocate_rid_pool(module, req);
2631         }
2632
2633         return ldb_next_request(module, req);
2634 }
2635
2636
2637 static const struct ldb_module_ops ldb_samldb_module_ops = {
2638         .name          = "samldb",
2639         .add           = samldb_add,
2640         .modify        = samldb_modify,
2641         .del           = samldb_delete,
2642         .extended      = samldb_extended
2643 };
2644
2645
2646 int ldb_samldb_module_init(const char *version)
2647 {
2648         LDB_MODULE_CHECK_VERSION(version);
2649         return ldb_register_module(&ldb_samldb_module_ops);
2650 }