source4/dsdb/samdb/ldb_modules/samldb.c

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