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 #include "libds/common/flag_mapping.h"
  43
  44 struct samldb_ctx;
  45
  46 typedef int (*samldb_step_fn_t)(struct samldb_ctx *);
  47
  48 struct samldb_step {
  49         struct samldb_step *next;
  50         samldb_step_fn_t fn;
  51 };
  52
  53 struct samldb_ctx {
  54         struct ldb_module *module;
  55         struct ldb_request *req;
  56
  57         /* used for add operations */
  58         const char *type;
  59
  60         /* the resulting message */
  61         struct ldb_message *msg;
  62
  63         /* used in "samldb_find_for_defaultObjectCategory" */
  64         struct ldb_dn *dn, *res_dn;
  65
  66         /* all the async steps necessary to complete the operation */
  67         struct samldb_step *steps;
  68         struct samldb_step *curstep;
  69
  70         /* If someone set an ares to forward controls and response back to the caller */
  71         struct ldb_reply *ares;
  72 };
  73
  74 static struct samldb_ctx *samldb_ctx_init(struct ldb_module *module,
  75                                           struct ldb_request *req)
  76 {
  77         struct ldb_context *ldb;
  78         struct samldb_ctx *ac;
  79
  80         ldb = ldb_module_get_ctx(module);
  81
  82         ac = talloc_zero(req, struct samldb_ctx);
  83         if (ac == NULL) {
  84                 ldb_oom(ldb);
  85                 return NULL;
  86         }
  87
  88         ac->module = module;
  89         ac->req = req;
  90
  91         return ac;
  92 }
  93
  94 static int samldb_add_step(struct samldb_ctx *ac, samldb_step_fn_t fn)
  95 {
  96         struct samldb_step *step, *stepper;
  97
  98         step = talloc_zero(ac, struct samldb_step);
  99         if (step == NULL) {
 100                 return ldb_oom(ldb_module_get_ctx(ac->module));
 101         }
 102
 103         step->fn = fn;
 104
 105         if (ac->steps == NULL) {
 106                 ac->steps = step;
 107                 ac->curstep = step;
 108         } else {
 109                 if (ac->curstep == NULL)
 110                         return ldb_operr(ldb_module_get_ctx(ac->module));
 111                 for (stepper = ac->curstep; stepper->next != NULL;
 112                         stepper = stepper->next);
 113                 stepper->next = step;
 114         }
 115
 116         return LDB_SUCCESS;
 117 }
 118
 119 static int samldb_first_step(struct samldb_ctx *ac)
 120 {
 121         if (ac->steps == NULL) {
 122                 return ldb_operr(ldb_module_get_ctx(ac->module));
 123         }
 124
 125         ac->curstep = ac->steps;
 126         return ac->curstep->fn(ac);
 127 }
 128
 129 static int samldb_next_step(struct samldb_ctx *ac)
 130 {
 131         if (ac->curstep->next) {
 132                 ac->curstep = ac->curstep->next;
 133                 return ac->curstep->fn(ac);
 134         }
 135
 136         /* We exit the samldb module here. If someone set an "ares" to forward
 137          * controls and response back to the caller, use them. */
 138         if (ac->ares) {
 139                 return ldb_module_done(ac->req, ac->ares->controls,
 140                                        ac->ares->response, LDB_SUCCESS);
 141         } else {
 142                 return ldb_module_done(ac->req, NULL, NULL, LDB_SUCCESS);
 143         }
 144 }
 145
 146
 147 /* sAMAccountName handling */
 148
 149 static int samldb_generate_sAMAccountName(struct ldb_context *ldb,
 150                                           struct ldb_message *msg)
 151 {
 152         char *name;
 153
 154         /* Format: $000000-000000000000 */
 155
 156         name = talloc_asprintf(msg, "$%.6X-%.6X%.6X",
 157                                 (unsigned int)generate_random(),
 158                                 (unsigned int)generate_random(),
 159                                 (unsigned int)generate_random());
 160         if (name == NULL) {
 161                 return ldb_oom(ldb);
 162         }
 163         return ldb_msg_add_steal_string(msg, "sAMAccountName", name);
 164 }
 165
 166 static int samldb_check_sAMAccountName(struct samldb_ctx *ac)
 167 {
 168         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 169         const char *name;
 170         int ret;
 171         struct ldb_result *res;
 172         const char *noattrs[] = { NULL };
 173
 174         if (ldb_msg_find_element(ac->msg, "sAMAccountName") == NULL) {
 175                 ret = samldb_generate_sAMAccountName(ldb, ac->msg);
 176                 if (ret != LDB_SUCCESS) {
 177                         return ret;
 178                 }
 179         }
 180
 181         name = ldb_msg_find_attr_as_string(ac->msg, "sAMAccountName", NULL);
 182         if (name == NULL) {
 183                 /* The "sAMAccountName" cannot be nothing */
 184                 ldb_set_errstring(ldb,
 185                                   "samldb: Empty account names aren't allowed!");
 186                 return LDB_ERR_CONSTRAINT_VIOLATION;
 187         }
 188
 189         ret = dsdb_module_search(ac->module, ac, &res,
 190                                  NULL, LDB_SCOPE_SUBTREE, noattrs,
 191                                  DSDB_FLAG_NEXT_MODULE,
 192                                  ac->req,
 193                                  "(sAMAccountName=%s)",
 194                                  ldb_binary_encode_string(ac, name));
 195         if (ret != LDB_SUCCESS) {
 196                 return ret;
 197         }
 198         if (res->count != 0) {
 199                 ldb_asprintf_errstring(ldb,
 200                                        "samldb: Account name (sAMAccountName) '%s' already in use!",
 201                                        name);
 202                 talloc_free(res);
 203                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
 204         }
 205         talloc_free(res);
 206
 207         return samldb_next_step(ac);
 208 }
 209
 210
 211 static bool samldb_msg_add_sid(struct ldb_message *msg,
 212                                 const char *name,
 213                                 const struct dom_sid *sid)
 214 {
 215         struct ldb_val v;
 216         enum ndr_err_code ndr_err;
 217
 218         ndr_err = ndr_push_struct_blob(&v, msg, sid,
 219                                        (ndr_push_flags_fn_t)ndr_push_dom_sid);
 220         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 221                 return false;
 222         }
 223         return (ldb_msg_add_value(msg, name, &v, NULL) == 0);
 224 }
 225
 226
 227 /* allocate a SID using our RID Set */
 228 static int samldb_allocate_sid(struct samldb_ctx *ac)
 229 {
 230         uint32_t rid;
 231         struct dom_sid *sid;
 232         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 233         int ret;
 234
 235         ret = ridalloc_allocate_rid(ac->module, &rid, ac->req);
 236         if (ret != LDB_SUCCESS) {
 237                 return ret;
 238         }
 239
 240         sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), rid);
 241         if (sid == NULL) {
 242                 return ldb_module_oom(ac->module);
 243         }
 244
 245         if ( ! samldb_msg_add_sid(ac->msg, "objectSid", sid)) {
 246                 return ldb_operr(ldb);
 247         }
 248
 249         return samldb_next_step(ac);
 250 }
 251
 252 /*
 253   see if a krbtgt_number is available
 254  */
 255 static bool samldb_krbtgtnumber_available(struct samldb_ctx *ac,
 256                                           uint32_t krbtgt_number)
 257 {
 258         TALLOC_CTX *tmp_ctx = talloc_new(ac);
 259         struct ldb_result *res;
 260         const char *no_attrs[] = { NULL };
 261         int ret;
 262
 263         ret = dsdb_module_search(ac->module, tmp_ctx, &res, NULL,
 264                                  LDB_SCOPE_SUBTREE, no_attrs,
 265                                  DSDB_FLAG_NEXT_MODULE,
 266                                  ac->req,
 267                                  "(msDC-SecondaryKrbTgtNumber=%u)",
 268                                  krbtgt_number);
 269         if (ret == LDB_SUCCESS && res->count == 0) {
 270                 talloc_free(tmp_ctx);
 271                 return true;
 272         }
 273         talloc_free(tmp_ctx);
 274         return false;
 275 }
 276
 277 /* special handling for add in RODC join */
 278 static int samldb_rodc_add(struct samldb_ctx *ac)
 279 {
 280         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 281         uint32_t krbtgt_number, i_start, i;
 282         int ret;
 283         char *newpass;
 284         struct ldb_val newpass_utf16;
 285
 286         /* find a unused msDC-SecondaryKrbTgtNumber */
 287         i_start = generate_random() & 0xFFFF;
 288         if (i_start == 0) {
 289                 i_start = 1;
 290         }
 291
 292         for (i=i_start; i<=0xFFFF; i++) {
 293                 if (samldb_krbtgtnumber_available(ac, i)) {
 294                         krbtgt_number = i;
 295                         goto found;
 296                 }
 297         }
 298         for (i=1; i<i_start; i++) {
 299                 if (samldb_krbtgtnumber_available(ac, i)) {
 300                         krbtgt_number = i;
 301                         goto found;
 302                 }
 303         }
 304
 305         ldb_asprintf_errstring(ldb,
 306                                "%08X: Unable to find available msDS-SecondaryKrbTgtNumber",
 307                                W_ERROR_V(WERR_NO_SYSTEM_RESOURCES));
 308         return LDB_ERR_OTHER;
 309
 310 found:
 311         ret = ldb_msg_add_empty(ac->msg, "msDS-SecondaryKrbTgtNumber",
 312                                 LDB_FLAG_INTERNAL_DISABLE_VALIDATION, NULL);
 313         if (ret != LDB_SUCCESS) {
 314                 return ldb_operr(ldb);
 315         }
 316
 317         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
 318                                  "msDS-SecondaryKrbTgtNumber", krbtgt_number);
 319         if (ret != LDB_SUCCESS) {
 320                 return ldb_operr(ldb);
 321         }
 322
 323         ret = ldb_msg_add_fmt(ac->msg, "sAMAccountName", "krbtgt_%u",
 324                               krbtgt_number);
 325         if (ret != LDB_SUCCESS) {
 326                 return ldb_operr(ldb);
 327         }
 328
 329         newpass = generate_random_password(ac->msg, 128, 255);
 330         if (newpass == NULL) {
 331                 return ldb_operr(ldb);
 332         }
 333
 334         if (!convert_string_talloc(ac,
 335                                    CH_UNIX, CH_UTF16,
 336                                    newpass, strlen(newpass),
 337                                    (void *)&newpass_utf16.data,
 338                                    &newpass_utf16.length)) {
 339                 ldb_asprintf_errstring(ldb,
 340                                        "samldb_rodc_add: "
 341                                        "failed to generate UTF16 password from random password");
 342                 return LDB_ERR_OPERATIONS_ERROR;
 343         }
 344         ret = ldb_msg_add_steal_value(ac->msg, "clearTextPassword", &newpass_utf16);
 345         if (ret != LDB_SUCCESS) {
 346                 return ldb_operr(ldb);
 347         }
 348
 349         return samldb_next_step(ac);
 350 }
 351
 352 static int samldb_find_for_defaultObjectCategory(struct samldb_ctx *ac)
 353 {
 354         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 355         struct ldb_result *res;
 356         const char *no_attrs[] = { NULL };
 357         int ret;
 358
 359         ac->res_dn = NULL;
 360
 361         ret = dsdb_module_search(ac->module, ac, &res,
 362                                  ac->dn, LDB_SCOPE_BASE, no_attrs,
 363                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT
 364                                  | DSDB_FLAG_NEXT_MODULE,
 365                                  ac->req,
 366                                  "(objectClass=classSchema)");
 367         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 368                 /* Don't be pricky when the DN doesn't exist if we have the */
 369                 /* RELAX control specified */
 370                 if (ldb_request_get_control(ac->req,
 371                                             LDB_CONTROL_RELAX_OID) == NULL) {
 372                         ldb_set_errstring(ldb,
 373                                           "samldb_find_defaultObjectCategory: "
 374                                           "Invalid DN for 'defaultObjectCategory'!");
 375                         return LDB_ERR_CONSTRAINT_VIOLATION;
 376                 }
 377         }
 378         if ((ret != LDB_ERR_NO_SUCH_OBJECT) && (ret != LDB_SUCCESS)) {
 379                 return ret;
 380         }
 381
 382         ac->res_dn = ac->dn;
 383
 384         return samldb_next_step(ac);
 385 }
 386
 387 /**
 388  * msDS-IntId attributeSchema attribute handling
 389  * during LDB_ADD request processing
 390  */
 391 static int samldb_add_handle_msDS_IntId(struct samldb_ctx *ac)
 392 {
 393         int ret;
 394         bool id_exists;
 395         uint32_t msds_intid;
 396         int32_t system_flags;
 397         struct ldb_context *ldb;
 398         struct ldb_result *ldb_res;
 399         struct ldb_dn *schema_dn;
 400
 401         ldb = ldb_module_get_ctx(ac->module);
 402         schema_dn = ldb_get_schema_basedn(ldb);
 403
 404         /* replicated update should always go through */
 405         if (ldb_request_get_control(ac->req,
 406                                     DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
 407                 return LDB_SUCCESS;
 408         }
 409
 410         /* msDS-IntId is handled by system and should never be
 411          * passed by clients */
 412         if (ldb_msg_find_element(ac->msg, "msDS-IntId")) {
 413                 return LDB_ERR_UNWILLING_TO_PERFORM;
 414         }
 415
 416         /* do not generate msDS-IntId if Relax control is passed */
 417         if (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
 418                 return LDB_SUCCESS;
 419         }
 420
 421         /* check Functional Level */
 422         if (dsdb_functional_level(ldb) < DS_DOMAIN_FUNCTION_2003) {
 423                 return LDB_SUCCESS;
 424         }
 425
 426         /* check systemFlags for SCHEMA_BASE_OBJECT flag */
 427         system_flags = ldb_msg_find_attr_as_int(ac->msg, "systemFlags", 0);
 428         if (system_flags & SYSTEM_FLAG_SCHEMA_BASE_OBJECT) {
 429                 return LDB_SUCCESS;
 430         }
 431
 432         /* Generate new value for msDs-IntId
 433          * Value should be in 0x80000000..0xBFFFFFFF range */
 434         msds_intid = generate_random() % 0X3FFFFFFF;
 435         msds_intid += 0x80000000;
 436
 437         /* probe id values until unique one is found */
 438         do {
 439                 msds_intid++;
 440                 if (msds_intid > 0xBFFFFFFF) {
 441                         msds_intid = 0x80000001;
 442                 }
 443
 444                 ret = dsdb_module_search(ac->module, ac,
 445                                          &ldb_res,
 446                                          schema_dn, LDB_SCOPE_ONELEVEL, NULL,
 447                                          DSDB_FLAG_NEXT_MODULE,
 448                                          ac->req,
 449                                          "(msDS-IntId=%d)", msds_intid);
 450                 if (ret != LDB_SUCCESS) {
 451                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 452                                       __location__": Searching for msDS-IntId=%d failed - %s\n",
 453                                       msds_intid,
 454                                       ldb_errstring(ldb));
 455                         return ldb_operr(ldb);
 456                 }
 457                 id_exists = (ldb_res->count > 0);
 458
 459                 talloc_free(ldb_res);
 460         } while(id_exists);
 461
 462         return samdb_msg_add_int(ldb, ac->msg, ac->msg, "msDS-IntId",
 463                                  msds_intid);
 464 }
 465
 466
 467 /*
 468  * samldb_add_entry (async)
 469  */
 470
 471 static int samldb_add_entry_callback(struct ldb_request *req,
 472                                         struct ldb_reply *ares)
 473 {
 474         struct ldb_context *ldb;
 475         struct samldb_ctx *ac;
 476         int ret;
 477
 478         ac = talloc_get_type(req->context, struct samldb_ctx);
 479         ldb = ldb_module_get_ctx(ac->module);
 480
 481         if (!ares) {
 482                 return ldb_module_done(ac->req, NULL, NULL,
 483                                         LDB_ERR_OPERATIONS_ERROR);
 484         }
 485
 486         if (ares->type == LDB_REPLY_REFERRAL) {
 487                 return ldb_module_send_referral(ac->req, ares->referral);
 488         }
 489
 490         if (ares->error != LDB_SUCCESS) {
 491                 return ldb_module_done(ac->req, ares->controls,
 492                                         ares->response, ares->error);
 493         }
 494         if (ares->type != LDB_REPLY_DONE) {
 495                 ldb_set_errstring(ldb,
 496                         "Invalid reply type!\n");
 497                 return ldb_module_done(ac->req, NULL, NULL,
 498                                         LDB_ERR_OPERATIONS_ERROR);
 499         }
 500
 501         /* The caller may wish to get controls back from the add */
 502         ac->ares = talloc_steal(ac, ares);
 503
 504         ret = samldb_next_step(ac);
 505         if (ret != LDB_SUCCESS) {
 506                 return ldb_module_done(ac->req, NULL, NULL, ret);
 507         }
 508         return ret;
 509 }
 510
 511 static int samldb_add_entry(struct samldb_ctx *ac)
 512 {
 513         struct ldb_context *ldb;
 514         struct ldb_request *req;
 515         int ret;
 516
 517         ldb = ldb_module_get_ctx(ac->module);
 518
 519         ret = ldb_build_add_req(&req, ldb, ac,
 520                                 ac->msg,
 521                                 ac->req->controls,
 522                                 ac, samldb_add_entry_callback,
 523                                 ac->req);
 524         LDB_REQ_SET_LOCATION(req);
 525         if (ret != LDB_SUCCESS) {
 526                 return ret;
 527         }
 528
 529         return ldb_next_request(ac->module, req);
 530 }
 531
 532 /*
 533  * return true if msg carries an attributeSchema that is intended to be RODC
 534  * filtered but is also a system-critical attribute.
 535  */
 536 static bool check_rodc_critical_attribute(struct ldb_message *msg)
 537 {
 538         uint32_t schemaFlagsEx, searchFlags, rodc_filtered_flags;
 539
 540         schemaFlagsEx = ldb_msg_find_attr_as_uint(msg, "schemaFlagsEx", 0);
 541         searchFlags = ldb_msg_find_attr_as_uint(msg, "searchFlags", 0);
 542         rodc_filtered_flags = (SEARCH_FLAG_RODC_ATTRIBUTE
 543                               | SEARCH_FLAG_CONFIDENTIAL);
 544
 545         if ((schemaFlagsEx & SCHEMA_FLAG_ATTR_IS_CRITICAL) &&
 546                 ((searchFlags & rodc_filtered_flags) == rodc_filtered_flags)) {
 547                 return true;
 548         } else {
 549                 return false;
 550         }
 551 }
 552
 553
 554 static int samldb_fill_object(struct samldb_ctx *ac)
 555 {
 556         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 557         int ret;
 558
 559         /* Add information for the different account types */
 560         if (strcmp(ac->type, "user") == 0) {
 561                 struct ldb_control *rodc_control = ldb_request_get_control(ac->req,
 562                                                                            LDB_CONTROL_RODC_DCPROMO_OID);
 563                 if (rodc_control != NULL) {
 564                         /* see [MS-ADTS] 3.1.1.3.4.1.23 LDAP_SERVER_RODC_DCPROMO_OID */
 565                         rodc_control->critical = false;
 566                         ret = samldb_add_step(ac, samldb_rodc_add);
 567                         if (ret != LDB_SUCCESS) return ret;
 568                 }
 569
 570                 /* check if we have a valid sAMAccountName */
 571                 ret = samldb_add_step(ac, samldb_check_sAMAccountName);
 572                 if (ret != LDB_SUCCESS) return ret;
 573
 574                 ret = samldb_add_step(ac, samldb_add_entry);
 575                 if (ret != LDB_SUCCESS) return ret;
 576
 577         } else if (strcmp(ac->type, "group") == 0) {
 578                 /* check if we have a valid sAMAccountName */
 579                 ret = samldb_add_step(ac, samldb_check_sAMAccountName);
 580                 if (ret != LDB_SUCCESS) return ret;
 581
 582                 ret = samldb_add_step(ac, samldb_add_entry);
 583                 if (ret != LDB_SUCCESS) return ret;
 584
 585         } else if (strcmp(ac->type, "classSchema") == 0) {
 586                 const struct ldb_val *rdn_value, *def_obj_cat_val;
 587
 588                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 589                                                   "rdnAttId", "cn");
 590                 if (ret != LDB_SUCCESS) return ret;
 591
 592                 /* do not allow to mark an attributeSchema as RODC filtered if it
 593                  * is system-critical */
 594                 if (check_rodc_critical_attribute(ac->msg)) {
 595                         ldb_asprintf_errstring(ldb, "Refusing schema add of %s - cannot combine critical class with RODC filtering",
 596                                                ldb_dn_get_linearized(ac->msg->dn));
 597                         return LDB_ERR_UNWILLING_TO_PERFORM;
 598                 }
 599
 600                 rdn_value = ldb_dn_get_rdn_val(ac->msg->dn);
 601                 if (rdn_value == NULL) {
 602                         return ldb_operr(ldb);
 603                 }
 604                 if (!ldb_msg_find_element(ac->msg, "lDAPDisplayName")) {
 605                         /* the RDN has prefix "CN" */
 606                         ret = ldb_msg_add_string(ac->msg, "lDAPDisplayName",
 607                                 samdb_cn_to_lDAPDisplayName(ac->msg,
 608                                                             (const char *) rdn_value->data));
 609                         if (ret != LDB_SUCCESS) {
 610                                 ldb_oom(ldb);
 611                                 return ret;
 612                         }
 613                 }
 614
 615                 if (!ldb_msg_find_element(ac->msg, "schemaIDGUID")) {
 616                         struct GUID guid;
 617                         /* a new GUID */
 618                         guid = GUID_random();
 619                         ret = dsdb_msg_add_guid(ac->msg, &guid, "schemaIDGUID");
 620                         if (ret != LDB_SUCCESS) {
 621                                 ldb_oom(ldb);
 622                                 return ret;
 623                         }
 624                 }
 625
 626                 def_obj_cat_val = ldb_msg_find_ldb_val(ac->msg,
 627                                                        "defaultObjectCategory");
 628                 if (def_obj_cat_val != NULL) {
 629                         /* "defaultObjectCategory" has been set by the caller.
 630                          * Do some checks for consistency.
 631                          * NOTE: The real constraint check (that
 632                          * 'defaultObjectCategory' is the DN of the new
 633                          * objectclass or any parent of it) is still incomplete.
 634                          * For now we say that 'defaultObjectCategory' is valid
 635                          * if it exists and it is of objectclass "classSchema".
 636                          */
 637                         ac->dn = ldb_dn_from_ldb_val(ac, ldb, def_obj_cat_val);
 638                         if (ac->dn == NULL) {
 639                                 ldb_set_errstring(ldb,
 640                                                   "Invalid DN for 'defaultObjectCategory'!");
 641                                 return LDB_ERR_CONSTRAINT_VIOLATION;
 642                         }
 643                 } else {
 644                         /* "defaultObjectCategory" has not been set by the
 645                          * caller. Use the entry DN for it. */
 646                         ac->dn = ac->msg->dn;
 647
 648                         ret = ldb_msg_add_string(ac->msg, "defaultObjectCategory",
 649                                                  ldb_dn_alloc_linearized(ac->msg, ac->dn));
 650                         if (ret != LDB_SUCCESS) {
 651                                 ldb_oom(ldb);
 652                                 return ret;
 653                         }
 654                 }
 655
 656                 ret = samldb_add_step(ac, samldb_add_entry);
 657                 if (ret != LDB_SUCCESS) return ret;
 658
 659                 /* Now perform the checks for the 'defaultObjectCategory'. The
 660                  * lookup DN was already saved in "ac->dn" */
 661                 ret = samldb_add_step(ac, samldb_find_for_defaultObjectCategory);
 662                 if (ret != LDB_SUCCESS) return ret;
 663
 664         } else if (strcmp(ac->type, "attributeSchema") == 0) {
 665                 const struct ldb_val *rdn_value;
 666                 rdn_value = ldb_dn_get_rdn_val(ac->msg->dn);
 667                 if (rdn_value == NULL) {
 668                         return ldb_operr(ldb);
 669                 }
 670                 if (!ldb_msg_find_element(ac->msg, "lDAPDisplayName")) {
 671                         /* the RDN has prefix "CN" */
 672                         ret = ldb_msg_add_string(ac->msg, "lDAPDisplayName",
 673                                 samdb_cn_to_lDAPDisplayName(ac->msg,
 674                                                             (const char *) rdn_value->data));
 675                         if (ret != LDB_SUCCESS) {
 676                                 ldb_oom(ldb);
 677                                 return ret;
 678                         }
 679                 }
 680
 681                 /* do not allow to mark an attributeSchema as RODC filtered if it
 682                  * is system-critical */
 683                 if (check_rodc_critical_attribute(ac->msg)) {
 684                         ldb_asprintf_errstring(ldb,
 685                                                "samldb: refusing schema add of %s - cannot combine critical attribute with RODC filtering",
 686                                                ldb_dn_get_linearized(ac->msg->dn));
 687                         return LDB_ERR_UNWILLING_TO_PERFORM;
 688                 }
 689
 690                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 691                                                   "isSingleValued", "FALSE");
 692                 if (ret != LDB_SUCCESS) return ret;
 693
 694                 if (!ldb_msg_find_element(ac->msg, "schemaIDGUID")) {
 695                         struct GUID guid;
 696                         /* a new GUID */
 697                         guid = GUID_random();
 698                         ret = dsdb_msg_add_guid(ac->msg, &guid, "schemaIDGUID");
 699                         if (ret != LDB_SUCCESS) {
 700                                 ldb_oom(ldb);
 701                                 return ret;
 702                         }
 703                 }
 704
 705                 /* handle msDS-IntID attribute */
 706                 ret = samldb_add_handle_msDS_IntId(ac);
 707                 if (ret != LDB_SUCCESS) return ret;
 708
 709                 ret = samldb_add_step(ac, samldb_add_entry);
 710                 if (ret != LDB_SUCCESS) return ret;
 711
 712         } else {
 713                 ldb_asprintf_errstring(ldb,
 714                         "Invalid entry type!");
 715                 return LDB_ERR_OPERATIONS_ERROR;
 716         }
 717
 718         return samldb_first_step(ac);
 719 }
 720
 721 static int samldb_fill_foreignSecurityPrincipal_object(struct samldb_ctx *ac)
 722 {
 723         struct ldb_context *ldb;
 724         const struct ldb_val *rdn_value;
 725         struct dom_sid *sid;
 726         int ret;
 727
 728         ldb = ldb_module_get_ctx(ac->module);
 729
 730         sid = samdb_result_dom_sid(ac->msg, ac->msg, "objectSid");
 731         if (sid == NULL) {
 732                 rdn_value = ldb_dn_get_rdn_val(ac->msg->dn);
 733                 if (rdn_value == NULL) {
 734                         return ldb_operr(ldb);
 735                 }
 736                 sid = dom_sid_parse_talloc(ac->msg,
 737                                            (const char *)rdn_value->data);
 738                 if (sid == NULL) {
 739                         ldb_set_errstring(ldb,
 740                                           "samldb: No valid SID found in ForeignSecurityPrincipal CN!");
 741                         return LDB_ERR_CONSTRAINT_VIOLATION;
 742                 }
 743                 if (! samldb_msg_add_sid(ac->msg, "objectSid", sid)) {
 744                         return ldb_operr(ldb);
 745                 }
 746         }
 747
 748         /* finally proceed with adding the entry */
 749         ret = samldb_add_step(ac, samldb_add_entry);
 750         if (ret != LDB_SUCCESS) return ret;
 751
 752         return samldb_first_step(ac);
 753 }
 754
 755 static int samldb_schema_info_update(struct samldb_ctx *ac)
 756 {
 757         int ret;
 758         struct ldb_context *ldb;
 759         struct dsdb_schema *schema;
 760
 761         /* replicated update should always go through */
 762         if (ldb_request_get_control(ac->req,
 763                                     DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
 764                 return LDB_SUCCESS;
 765         }
 766
 767         /* do not update schemaInfo during provisioning */
 768         if (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
 769                 return LDB_SUCCESS;
 770         }
 771
 772         ldb = ldb_module_get_ctx(ac->module);
 773         schema = dsdb_get_schema(ldb, NULL);
 774         if (!schema) {
 775                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 776                               "samldb_schema_info_update: no dsdb_schema loaded");
 777                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 778                 return ldb_operr(ldb);
 779         }
 780
 781         ret = dsdb_module_schema_info_update(ac->module, schema,
 782                                              DSDB_FLAG_NEXT_MODULE, ac->req);
 783         if (ret != LDB_SUCCESS) {
 784                 ldb_asprintf_errstring(ldb,
 785                                        "samldb_schema_info_update: dsdb_module_schema_info_update failed with %s",
 786                                        ldb_errstring(ldb));
 787                 return ret;
 788         }
 789
 790         return LDB_SUCCESS;
 791 }
 792
 793 /*
 794  * "Objectclass" trigger (MS-SAMR 3.1.1.8.1)
 795  *
 796  * Has to be invoked on "add" and "modify" operations on "user", "computer" and
 797  * "group" objects.
 798  * ac->msg contains the "add"/"modify" message
 799  * ac->type contains the object type (main objectclass)
 800  */
 801 static int samldb_objectclass_trigger(struct samldb_ctx *ac)
 802 {
 803         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
 804         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb,
 805                                          "loadparm"), struct loadparm_context);
 806         struct ldb_message_element *el, *el2;
 807         enum sid_generator sid_generator;
 808         struct dom_sid *sid;
 809         int ret;
 810
 811         /* make sure that "sAMAccountType" is not specified */
 812         el = ldb_msg_find_element(ac->msg, "sAMAccountType");
 813         if (el != NULL) {
 814                 ldb_set_errstring(ldb,
 815                                   "samldb: sAMAccountType must not be specified!");
 816                 return LDB_ERR_UNWILLING_TO_PERFORM;
 817         }
 818
 819         /* Step 1: objectSid assignment */
 820
 821         /* Don't allow the objectSid to be changed. But beside the RELAX
 822          * control we have also to guarantee that it can always be set with
 823          * SYSTEM permissions. This is needed for the "samba3sam" backend. */
 824         sid = samdb_result_dom_sid(ac, ac->msg, "objectSid");
 825         if ((sid != NULL) && (!dsdb_module_am_system(ac->module)) &&
 826             (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID) == NULL)) {
 827                 ldb_set_errstring(ldb,
 828                                   "samldb: objectSid must not be specified!");
 829                 return LDB_ERR_UNWILLING_TO_PERFORM;
 830         }
 831
 832         /* but generate a new SID when we do have an add operations */
 833         if ((sid == NULL) && (ac->req->operation == LDB_ADD)) {
 834                 sid_generator = lpcfg_sid_generator(lp_ctx);
 835                 if (sid_generator == SID_GENERATOR_INTERNAL) {
 836                         ret = samldb_add_step(ac, samldb_allocate_sid);
 837                         if (ret != LDB_SUCCESS) return ret;
 838                 }
 839         }
 840
 841         if (strcmp(ac->type, "user") == 0) {
 842                 bool uac_generated = false;
 843
 844                 /* Step 1.2: Default values */
 845                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 846                         "accountExpires", "9223372036854775807");
 847                 if (ret != LDB_SUCCESS) return ret;
 848                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 849                         "badPasswordTime", "0");
 850                 if (ret != LDB_SUCCESS) return ret;
 851                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 852                         "badPwdCount", "0");
 853                 if (ret != LDB_SUCCESS) return ret;
 854                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 855                         "codePage", "0");
 856                 if (ret != LDB_SUCCESS) return ret;
 857                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 858                         "countryCode", "0");
 859                 if (ret != LDB_SUCCESS) return ret;
 860                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 861                         "lastLogoff", "0");
 862                 if (ret != LDB_SUCCESS) return ret;
 863                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 864                         "lastLogon", "0");
 865                 if (ret != LDB_SUCCESS) return ret;
 866                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 867                         "logonCount", "0");
 868                 if (ret != LDB_SUCCESS) return ret;
 869                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 870                         "pwdLastSet", "0");
 871                 if (ret != LDB_SUCCESS) return ret;
 872
 873                 /* On add operations we might need to generate a
 874                  * "userAccountControl" (if it isn't specified). */
 875                 el = ldb_msg_find_element(ac->msg, "userAccountControl");
 876                 if ((el == NULL) && (ac->req->operation == LDB_ADD)) {
 877                         ret = samdb_msg_set_uint(ldb, ac->msg, ac->msg,
 878                                                  "userAccountControl",
 879                                                  UF_NORMAL_ACCOUNT);
 880                         if (ret != LDB_SUCCESS) {
 881                                 return ret;
 882                         }
 883                         uac_generated = true;
 884                 }
 885
 886                 el = ldb_msg_find_element(ac->msg, "userAccountControl");
 887                 if (el != NULL) {
 888                         uint32_t user_account_control, account_type;
 889
 890                         /* Step 1.3: "userAccountControl" -> "sAMAccountType" mapping */
 891                         user_account_control = ldb_msg_find_attr_as_uint(ac->msg,
 892                                                                          "userAccountControl",
 893                                                                          0);
 894
 895                         /* Temporary duplicate accounts aren't allowed */
 896                         if ((user_account_control & UF_TEMP_DUPLICATE_ACCOUNT) != 0) {
 897                                 return LDB_ERR_OTHER;
 898                         }
 899
 900                         account_type = ds_uf2atype(user_account_control);
 901                         if (account_type == 0) {
 902                                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
 903                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 904                         }
 905                         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
 906                                                  "sAMAccountType",
 907                                                  account_type);
 908                         if (ret != LDB_SUCCESS) {
 909                                 return ret;
 910                         }
 911                         el2 = ldb_msg_find_element(ac->msg, "sAMAccountType");
 912                         el2->flags = LDB_FLAG_MOD_REPLACE;
 913
 914                         if (user_account_control &
 915                             (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
 916                                 ret = samdb_msg_set_string(ldb, ac->msg, ac->msg,
 917                                                            "isCriticalSystemObject",
 918                                                            "TRUE");
 919                                 if (ret != LDB_SUCCESS) {
 920                                         return ret;
 921                                 }
 922                                 el2 = ldb_msg_find_element(ac->msg,
 923                                                            "isCriticalSystemObject");
 924                                 el2->flags = LDB_FLAG_MOD_REPLACE;
 925                         }
 926
 927                         /* Step 1.4: "userAccountControl" -> "primaryGroupID" mapping */
 928                         if (!ldb_msg_find_element(ac->msg, "primaryGroupID")) {
 929                                 uint32_t rid = ds_uf2prim_group_rid(user_account_control);
 930                                 ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
 931                                                          "primaryGroupID", rid);
 932                                 if (ret != LDB_SUCCESS) {
 933                                         return ret;
 934                                 }
 935                                 el2 = ldb_msg_find_element(ac->msg,
 936                                                            "primaryGroupID");
 937                                 el2->flags = LDB_FLAG_MOD_REPLACE;
 938                         }
 939
 940                         /* Step 1.5: Add additional flags when needed */
 941                         /* Obviously this is done when the "userAccountControl"
 942                          * has been generated here (tested against Windows
 943                          * Server) */
 944                         if (uac_generated) {
 945                                 user_account_control |= UF_ACCOUNTDISABLE;
 946                                 user_account_control |= UF_PASSWD_NOTREQD;
 947
 948                                 ret = samdb_msg_set_uint(ldb, ac->msg, ac->msg,
 949                                                          "userAccountControl",
 950                                                          user_account_control);
 951                                 if (ret != LDB_SUCCESS) {
 952                                         return ret;
 953                                 }
 954                         }
 955                 }
 956
 957         } else if (strcmp(ac->type, "group") == 0) {
 958                 const char *tempstr;
 959
 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         uint32_t rid;
1016         struct dom_sid *sid;
1017         struct ldb_result *res;
1018         int ret;
1019         const char *noattrs[] = { NULL };
1020
1021         rid = ldb_msg_find_attr_as_uint(ac->msg, "primaryGroupID", (uint32_t) -1);
1022         if (rid == (uint32_t) -1) {
1023                 /* we aren't affected of any primary group set */
1024                 return LDB_SUCCESS;
1025
1026         } else if (!ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
1027                 ldb_set_errstring(ldb,
1028                                   "The primary group isn't settable on add operations!");
1029                 return LDB_ERR_UNWILLING_TO_PERFORM;
1030         }
1031
1032         sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), rid);
1033         if (sid == NULL) {
1034                 return ldb_operr(ldb);
1035         }
1036
1037         ret = dsdb_module_search(ac->module, ac, &res, NULL, LDB_SCOPE_SUBTREE,
1038                                  noattrs, DSDB_FLAG_NEXT_MODULE,
1039                                  ac->req,
1040                                  "(objectSid=%s)",
1041                                  ldap_encode_ndr_dom_sid(ac, sid));
1042         if (ret != LDB_SUCCESS) {
1043                 return ret;
1044         }
1045         if (res->count != 1) {
1046                 talloc_free(res);
1047                 ldb_asprintf_errstring(ldb,
1048                                        "Failed to find primary group with RID %u!",
1049                                        rid);
1050                 return LDB_ERR_UNWILLING_TO_PERFORM;
1051         }
1052         talloc_free(res);
1053
1054         return LDB_SUCCESS;
1055 }
1056
1057 static int samldb_prim_group_change(struct samldb_ctx *ac)
1058 {
1059         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1060         const char * attrs[] = { "primaryGroupID", "memberOf", NULL };
1061         struct ldb_result *res, *group_res;
1062         struct ldb_message_element *el;
1063         struct ldb_message *msg;
1064         uint32_t prev_rid, new_rid;
1065         struct dom_sid *prev_sid, *new_sid;
1066         struct ldb_dn *prev_prim_group_dn, *new_prim_group_dn;
1067         int ret;
1068         const char *noattrs[] = { NULL };
1069
1070         el = dsdb_get_single_valued_attr(ac->msg, "primaryGroupID",
1071                                          ac->req->operation);
1072         if (el == NULL) {
1073                 /* we are not affected */
1074                 return LDB_SUCCESS;
1075         }
1076
1077         /* Fetch information from the existing object */
1078
1079         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1080                                  DSDB_FLAG_NEXT_MODULE, ac->req, NULL);
1081         if (ret != LDB_SUCCESS) {
1082                 return ret;
1083         }
1084         if (res->count != 1) {
1085                 return ldb_operr(ldb);
1086         }
1087
1088         /* Finds out the DN of the old primary group */
1089
1090         prev_rid = ldb_msg_find_attr_as_uint(res->msgs[0], "primaryGroupID",
1091                                              (uint32_t) -1);
1092         if (prev_rid == (uint32_t) -1) {
1093                 /* User objects do always have a mandatory "primaryGroupID"
1094                  * attribute. If this doesn't exist then the object is of the
1095                  * wrong type. This is the exact Windows error code */
1096                 return LDB_ERR_OBJECT_CLASS_VIOLATION;
1097         }
1098
1099         prev_sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), prev_rid);
1100         if (prev_sid == NULL) {
1101                 return ldb_operr(ldb);
1102         }
1103
1104         /* Finds out the DN of the new primary group
1105          * Notice: in order to parse the primary group ID correctly we create
1106          * a temporary message here. */
1107
1108         msg = ldb_msg_new(ac->msg);
1109         if (msg == NULL) {
1110                 return ldb_module_oom(ac->module);
1111         }
1112         ret = ldb_msg_add(msg, el, 0);
1113         if (ret != LDB_SUCCESS) {
1114                 return ret;
1115         }
1116         new_rid = ldb_msg_find_attr_as_uint(msg, "primaryGroupID", (uint32_t) -1);
1117         talloc_free(msg);
1118         if (new_rid == (uint32_t) -1) {
1119                 /* we aren't affected of any primary group change */
1120                 return LDB_SUCCESS;
1121         }
1122
1123         if (prev_rid == new_rid) {
1124                 return LDB_SUCCESS;
1125         }
1126
1127         ret = dsdb_module_search(ac->module, ac, &group_res, NULL, LDB_SCOPE_SUBTREE,
1128                                  noattrs, DSDB_FLAG_NEXT_MODULE,
1129                                  ac->req,
1130                                  "(objectSid=%s)",
1131                                  ldap_encode_ndr_dom_sid(ac, prev_sid));
1132         if (ret != LDB_SUCCESS) {
1133                 return ret;
1134         }
1135         if (group_res->count != 1) {
1136                 return ldb_operr(ldb);
1137         }
1138         prev_prim_group_dn = group_res->msgs[0]->dn;
1139
1140         new_sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), new_rid);
1141         if (new_sid == NULL) {
1142                 return ldb_operr(ldb);
1143         }
1144
1145         ret = dsdb_module_search(ac->module, ac, &group_res, NULL, LDB_SCOPE_SUBTREE,
1146                                  noattrs, DSDB_FLAG_NEXT_MODULE,
1147                                  ac->req,
1148                                  "(objectSid=%s)",
1149                                  ldap_encode_ndr_dom_sid(ac, new_sid));
1150         if (ret != LDB_SUCCESS) {
1151                 return ret;
1152         }
1153         if (group_res->count != 1) {
1154                 /* Here we know if the specified new primary group candidate is
1155                  * valid or not. */
1156                 return LDB_ERR_UNWILLING_TO_PERFORM;
1157         }
1158         new_prim_group_dn = group_res->msgs[0]->dn;
1159
1160         /* We need to be already a normal member of the new primary
1161          * group in order to be successful. */
1162         el = samdb_find_attribute(ldb, res->msgs[0], "memberOf",
1163                                   ldb_dn_get_linearized(new_prim_group_dn));
1164         if (el == NULL) {
1165                 return LDB_ERR_UNWILLING_TO_PERFORM;
1166         }
1167
1168         /* Remove the "member" attribute on the new primary group */
1169         msg = ldb_msg_new(ac->msg);
1170         if (msg == NULL) {
1171                 return ldb_module_oom(ac->module);
1172         }
1173         msg->dn = new_prim_group_dn;
1174
1175         ret = samdb_msg_add_delval(ldb, msg, msg, "member",
1176                                    ldb_dn_get_linearized(ac->msg->dn));
1177         if (ret != LDB_SUCCESS) {
1178                 return ret;
1179         }
1180
1181         ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE, ac->req);
1182         if (ret != LDB_SUCCESS) {
1183                 return ret;
1184         }
1185         talloc_free(msg);
1186
1187         /* Add a "member" attribute for the previous primary group */
1188         msg = ldb_msg_new(ac->msg);
1189         if (msg == NULL) {
1190                 return ldb_module_oom(ac->module);
1191         }
1192         msg->dn = prev_prim_group_dn;
1193
1194         ret = samdb_msg_add_addval(ldb, msg, msg, "member",
1195                                    ldb_dn_get_linearized(ac->msg->dn));
1196         if (ret != LDB_SUCCESS) {
1197                 return ret;
1198         }
1199
1200         ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE, ac->req);
1201         if (ret != LDB_SUCCESS) {
1202                 return ret;
1203         }
1204         talloc_free(msg);
1205
1206         return LDB_SUCCESS;
1207 }
1208
1209 static int samldb_prim_group_trigger(struct samldb_ctx *ac)
1210 {
1211         int ret;
1212
1213         if (ac->req->operation == LDB_ADD) {
1214                 ret = samldb_prim_group_set(ac);
1215         } else {
1216                 ret = samldb_prim_group_change(ac);
1217         }
1218
1219         return ret;
1220 }
1221
1222
1223 /**
1224  * This function is called on a LDB modify. It performs some additions/changes
1225  * on the current LDB message. Changes depend on the value of
1226  * userAccountControl.
1227  */
1228 static int samldb_user_account_control_change(struct samldb_ctx *ac)
1229 {
1230         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1231         uint32_t user_account_control, account_type;
1232         struct ldb_message_element *el;
1233         struct ldb_message *tmp_msg;
1234         int ret;
1235
1236         el = dsdb_get_single_valued_attr(ac->msg, "userAccountControl",
1237                                          ac->req->operation);
1238         if (el == NULL) {
1239                 /* we are not affected */
1240                 return LDB_SUCCESS;
1241         }
1242
1243         /* Create a temporary message for fetching the "userAccountControl" */
1244         tmp_msg = ldb_msg_new(ac->msg);
1245         if (tmp_msg == NULL) {
1246                 return ldb_module_oom(ac->module);
1247         }
1248         ret = ldb_msg_add(tmp_msg, el, 0);
1249         if (ret != LDB_SUCCESS) {
1250                 return ret;
1251         }
1252         user_account_control = ldb_msg_find_attr_as_uint(tmp_msg,
1253                                                          "userAccountControl",
1254                                                          0);
1255         talloc_free(tmp_msg);
1256
1257         /* Temporary duplicate accounts aren't allowed */
1258         if ((user_account_control & UF_TEMP_DUPLICATE_ACCOUNT) != 0) {
1259                 return LDB_ERR_OTHER;
1260         }
1261
1262         account_type = ds_uf2atype(user_account_control);
1263         if (account_type == 0) {
1264                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
1265                 return LDB_ERR_UNWILLING_TO_PERFORM;
1266         }
1267         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "sAMAccountType",
1268                                  account_type);
1269         if (ret != LDB_SUCCESS) {
1270                 return ret;
1271         }
1272         el = ldb_msg_find_element(ac->msg, "sAMAccountType");
1273         el->flags = LDB_FLAG_MOD_REPLACE;
1274
1275         if (user_account_control
1276             & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
1277                 ret = ldb_msg_add_string(ac->msg, "isCriticalSystemObject",
1278                                          "TRUE");
1279                 if (ret != LDB_SUCCESS) {
1280                         return ret;
1281                 }
1282                 el = ldb_msg_find_element(ac->msg,
1283                                            "isCriticalSystemObject");
1284                 el->flags = LDB_FLAG_MOD_REPLACE;
1285         }
1286
1287         /*
1288          * If the account has UF_SERVER_TRUST_ACCOUNT or
1289          * UF_WORKSTATION_TRUST_ACCOUNT then change the group
1290          * as it's either a workstation, a RODC, or a DC.
1291          *
1292          * If not it might be just a user that we are enabling
1293          * and in this case we don't want to change its default group.
1294          */
1295         if (user_account_control & (UF_SERVER_TRUST_ACCOUNT| UF_WORKSTATION_TRUST_ACCOUNT) &&
1296                         !ldb_msg_find_element(ac->msg, "primaryGroupID")) {
1297                 uint32_t rid = ds_uf2prim_group_rid(user_account_control);
1298                 ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
1299                                          "primaryGroupID", rid);
1300                 if (ret != LDB_SUCCESS) {
1301                         return ret;
1302                 }
1303                 el = ldb_msg_find_element(ac->msg,
1304                                            "primaryGroupID");
1305                 el->flags = LDB_FLAG_MOD_REPLACE;
1306         }
1307
1308         return LDB_SUCCESS;
1309 }
1310
1311 static int samldb_group_type_change(struct samldb_ctx *ac)
1312 {
1313         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1314         uint32_t group_type, old_group_type, account_type;
1315         struct ldb_message_element *el;
1316         struct ldb_message *tmp_msg;
1317         int ret;
1318         struct ldb_result *res;
1319         const char *attrs[] = { "groupType", NULL };
1320
1321         el = dsdb_get_single_valued_attr(ac->msg, "groupType",
1322                                          ac->req->operation);
1323         if (el == NULL) {
1324                 /* we are not affected */
1325                 return LDB_SUCCESS;
1326         }
1327
1328         /* Create a temporary message for fetching the "groupType" */
1329         tmp_msg = ldb_msg_new(ac->msg);
1330         if (tmp_msg == NULL) {
1331                 return ldb_module_oom(ac->module);
1332         }
1333         ret = ldb_msg_add(tmp_msg, el, 0);
1334         if (ret != LDB_SUCCESS) {
1335                 return ret;
1336         }
1337         group_type = ldb_msg_find_attr_as_uint(tmp_msg, "groupType", 0);
1338         talloc_free(tmp_msg);
1339
1340         ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, attrs,
1341                                     DSDB_FLAG_NEXT_MODULE, ac->req);
1342         if (ret != LDB_SUCCESS) {
1343                 return ret;
1344         }
1345         old_group_type = ldb_msg_find_attr_as_uint(res->msgs[0], "groupType", 0);
1346         if (old_group_type == 0) {
1347                 return ldb_operr(ldb);
1348         }
1349
1350         /* Group type switching isn't so easy as it seems: We can only
1351          * change in this directions: global <-> universal <-> local
1352          * On each step also the group type itself
1353          * (security/distribution) is variable. */
1354
1355         if (ldb_request_get_control(ac->req, LDB_CONTROL_PROVISION_OID) == NULL) {
1356                 switch (group_type) {
1357                 case GTYPE_SECURITY_GLOBAL_GROUP:
1358                 case GTYPE_DISTRIBUTION_GLOBAL_GROUP:
1359                         /* change to "universal" allowed */
1360                         if ((old_group_type == GTYPE_SECURITY_DOMAIN_LOCAL_GROUP) ||
1361                         (old_group_type == GTYPE_DISTRIBUTION_DOMAIN_LOCAL_GROUP)) {
1362                                 ldb_set_errstring(ldb,
1363                                         "samldb: Change from security/distribution local group forbidden!");
1364                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1365                         }
1366                 break;
1367
1368                 case GTYPE_SECURITY_UNIVERSAL_GROUP:
1369                 case GTYPE_DISTRIBUTION_UNIVERSAL_GROUP:
1370                         /* each change allowed */
1371                 break;
1372                 case GTYPE_SECURITY_DOMAIN_LOCAL_GROUP:
1373                 case GTYPE_DISTRIBUTION_DOMAIN_LOCAL_GROUP:
1374                         /* change to "universal" allowed */
1375                         if ((old_group_type == GTYPE_SECURITY_GLOBAL_GROUP) ||
1376                         (old_group_type == GTYPE_DISTRIBUTION_GLOBAL_GROUP)) {
1377                                 ldb_set_errstring(ldb,
1378                                         "samldb: Change from security/distribution global group forbidden!");
1379                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1380                         }
1381                 break;
1382
1383                 case GTYPE_SECURITY_BUILTIN_LOCAL_GROUP:
1384                 default:
1385                         /* we don't allow this "groupType" values */
1386                         return LDB_ERR_UNWILLING_TO_PERFORM;
1387                 break;
1388                 }
1389         }
1390
1391         account_type =  ds_gtype2atype(group_type);
1392         if (account_type == 0) {
1393                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
1394                 return LDB_ERR_UNWILLING_TO_PERFORM;
1395         }
1396         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "sAMAccountType",
1397                                  account_type);
1398         if (ret != LDB_SUCCESS) {
1399                 return ret;
1400         }
1401         el = ldb_msg_find_element(ac->msg, "sAMAccountType");
1402         el->flags = LDB_FLAG_MOD_REPLACE;
1403
1404         return LDB_SUCCESS;
1405 }
1406
1407 static int samldb_sam_accountname_check(struct samldb_ctx *ac)
1408 {
1409         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1410         const char *no_attrs[] = { NULL };
1411         struct ldb_result *res;
1412         const char *sam_accountname, *enc_str;
1413         struct ldb_message_element *el;
1414         struct ldb_message *tmp_msg;
1415         int ret;
1416
1417         el = dsdb_get_single_valued_attr(ac->msg, "sAMAccountName",
1418                                          ac->req->operation);
1419         if (el == NULL) {
1420                 /* we are not affected */
1421                 return LDB_SUCCESS;
1422         }
1423
1424         /* Create a temporary message for fetching the "sAMAccountName" */
1425         tmp_msg = ldb_msg_new(ac->msg);
1426         if (tmp_msg == NULL) {
1427                 return ldb_module_oom(ac->module);
1428         }
1429         ret = ldb_msg_add(tmp_msg, el, 0);
1430         if (ret != LDB_SUCCESS) {
1431                 return ret;
1432         }
1433         sam_accountname = talloc_steal(ac,
1434                                        ldb_msg_find_attr_as_string(tmp_msg, "sAMAccountName", NULL));
1435         talloc_free(tmp_msg);
1436
1437         if (sam_accountname == NULL) {
1438                 /* The "sAMAccountName" cannot be nothing */
1439                 ldb_set_errstring(ldb,
1440                                   "samldb: Empty account names aren't allowed!");
1441                 return LDB_ERR_UNWILLING_TO_PERFORM;
1442         }
1443
1444         enc_str = ldb_binary_encode_string(ac, sam_accountname);
1445         if (enc_str == NULL) {
1446                 return ldb_module_oom(ac->module);
1447         }
1448
1449         /* Make sure that a "sAMAccountName" is only used once */
1450
1451         ret = dsdb_module_search(ac->module, ac, &res, NULL, LDB_SCOPE_SUBTREE, no_attrs,
1452                                  DSDB_FLAG_NEXT_MODULE, ac->req,
1453                                  "(sAMAccountName=%s)", enc_str);
1454         if (ret != LDB_SUCCESS) {
1455                 return ret;
1456         }
1457         if (res->count > 1) {
1458                 return ldb_operr(ldb);
1459         } else if (res->count == 1) {
1460                 if (ldb_dn_compare(res->msgs[0]->dn, ac->msg->dn) != 0) {
1461                         ldb_asprintf_errstring(ldb,
1462                                                "samldb: Account name (sAMAccountName) '%s' already in use!",
1463                                                sam_accountname);
1464                         return LDB_ERR_ENTRY_ALREADY_EXISTS;
1465                 }
1466         }
1467         talloc_free(res);
1468
1469         return LDB_SUCCESS;
1470 }
1471
1472 static int samldb_member_check(struct samldb_ctx *ac)
1473 {
1474         static const char * const attrs[] = { "objectSid", "member", NULL };
1475         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1476         struct ldb_message_element *el;
1477         struct ldb_dn *member_dn;
1478         struct dom_sid *sid;
1479         struct ldb_result *res;
1480         struct dom_sid *group_sid;
1481         unsigned int i, j;
1482         int cnt;
1483         int ret;
1484
1485         /* Fetch information from the existing object */
1486
1487         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1488                                  DSDB_FLAG_NEXT_MODULE, ac->req, NULL);
1489         if (ret != LDB_SUCCESS) {
1490                 return ret;
1491         }
1492         if (res->count != 1) {
1493                 return ldb_operr(ldb);
1494         }
1495
1496         group_sid = samdb_result_dom_sid(res, res->msgs[0], "objectSid");
1497         if (group_sid == NULL) {
1498                 return ldb_operr(ldb);
1499         }
1500
1501         /* We've to walk over all modification entries and consider the "member"
1502          * ones. */
1503         for (i = 0; i < ac->msg->num_elements; i++) {
1504                 if (ldb_attr_cmp(ac->msg->elements[i].name, "member") != 0) {
1505                         continue;
1506                 }
1507
1508                 el = &ac->msg->elements[i];
1509                 for (j = 0; j < el->num_values; j++) {
1510                         struct ldb_message_element *mo;
1511                         struct ldb_result *group_res;
1512                         const char *group_attrs[] = { "primaryGroupID" , NULL };
1513                         uint32_t prim_group_rid;
1514
1515                         member_dn = ldb_dn_from_ldb_val(ac, ldb,
1516                                                         &el->values[j]);
1517                         if (!ldb_dn_validate(member_dn)) {
1518                                 return ldb_operr(ldb);
1519                         }
1520
1521                         /* The "member" attribute can be modified with the
1522                          * following restrictions (beside a valid DN):
1523                          *
1524                          * - "add" operations can only be performed when the
1525                          *   member still doesn't exist - if not then return
1526                          *   ERR_ENTRY_ALREADY_EXISTS (not
1527                          *   ERR_ATTRIBUTE_OR_VALUE_EXISTS!)
1528                          * - "delete" operations can only be performed when the
1529                          *   member does exist - if not then return
1530                          *   ERR_UNWILLING_TO_PERFORM (not
1531                          *   ERR_NO_SUCH_ATTRIBUTE!)
1532                          * - primary group check
1533                          */
1534                         mo = samdb_find_attribute(ldb, res->msgs[0], "member",
1535                                                   ldb_dn_get_linearized(member_dn));
1536                         if (mo == NULL) {
1537                                 cnt = 0;
1538                         } else {
1539                                 cnt = 1;
1540                         }
1541
1542                         if ((cnt > 0) && (LDB_FLAG_MOD_TYPE(el->flags)
1543                             == LDB_FLAG_MOD_ADD)) {
1544                                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
1545                         }
1546                         if ((cnt == 0) && LDB_FLAG_MOD_TYPE(el->flags)
1547                             == LDB_FLAG_MOD_DELETE) {
1548                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1549                         }
1550
1551                         /* Denies to add "member"s to groups which are primary
1552                          * ones for them - in this case return
1553                          * ERR_ENTRY_ALREADY_EXISTS. */
1554
1555                         ret = dsdb_module_search_dn(ac->module, ac, &group_res,
1556                                                     member_dn, group_attrs,
1557                                                     DSDB_FLAG_NEXT_MODULE, ac->req);
1558                         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1559                                 /* member DN doesn't exist yet */
1560                                 continue;
1561                         }
1562                         if (ret != LDB_SUCCESS) {
1563                                 return ret;
1564                         }
1565                         prim_group_rid = ldb_msg_find_attr_as_uint(group_res->msgs[0], "primaryGroupID", (uint32_t)-1);
1566                         if (prim_group_rid == (uint32_t) -1) {
1567                                 /* the member hasn't to be a user account ->
1568                                  * therefore no check needed in this case. */
1569                                 continue;
1570                         }
1571
1572                         sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb),
1573                                               prim_group_rid);
1574                         if (sid == NULL) {
1575                                 return ldb_operr(ldb);
1576                         }
1577
1578                         if (dom_sid_equal(group_sid, sid)) {
1579                                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
1580                         }
1581                 }
1582         }
1583
1584         talloc_free(res);
1585
1586         return LDB_SUCCESS;
1587 }
1588
1589 /* SAM objects have special rules regarding the "description" attribute on
1590  * modify operations. */
1591 static int samldb_description_check(struct samldb_ctx *ac, bool *modified)
1592 {
1593         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1594         const char * const attrs[] = { "objectClass", "description", NULL };
1595         struct ldb_result *res;
1596         unsigned int i;
1597         int ret;
1598
1599         /* Fetch information from the existing object */
1600         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1601                                  DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED, ac->req,
1602                                  "(|(objectclass=user)(objectclass=group)(objectclass=samDomain)(objectclass=samServer))");
1603         if (ret != LDB_SUCCESS) {
1604                 /* don't treat it specially ... let normal error codes
1605                    happen from other places */
1606                 ldb_reset_err_string(ldb);
1607                 return LDB_SUCCESS;
1608         }
1609         if (res->count == 0) {
1610                 /* we didn't match the filter */
1611                 talloc_free(res);
1612                 return LDB_SUCCESS;
1613         }
1614
1615         /* We've to walk over all modification entries and consider the
1616          * "description" ones. */
1617         for (i = 0; i < ac->msg->num_elements; i++) {
1618                 if (ldb_attr_cmp(ac->msg->elements[i].name, "description") == 0) {
1619                         ac->msg->elements[i].flags |= LDB_FLAG_INTERNAL_FORCE_SINGLE_VALUE_CHECK;
1620                         *modified = true;
1621                 }
1622         }
1623
1624         talloc_free(res);
1625
1626         return LDB_SUCCESS;
1627 }
1628
1629 /* This trigger adapts the "servicePrincipalName" attributes if the
1630  * "dNSHostName" and/or "sAMAccountName" attribute change(s) */
1631 static int samldb_service_principal_names_change(struct samldb_ctx *ac)
1632 {
1633         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1634         struct ldb_message_element *el = NULL, *el2 = NULL;
1635         struct ldb_message *msg;
1636         const char *attrs[] = { "servicePrincipalName", NULL };
1637         struct ldb_result *res;
1638         const char *dns_hostname = NULL, *old_dns_hostname = NULL,
1639                    *sam_accountname = NULL, *old_sam_accountname = NULL;
1640         unsigned int i;
1641         int ret;
1642
1643         el = dsdb_get_single_valued_attr(ac->msg, "dNSHostName",
1644                                          ac->req->operation);
1645         el2 = dsdb_get_single_valued_attr(ac->msg, "sAMAccountName",
1646                                           ac->req->operation);
1647         if ((el == NULL) && (el2 == NULL)) {
1648                 /* we are not affected */
1649                 return LDB_SUCCESS;
1650         }
1651
1652         /* Create a temporary message for fetching the "dNSHostName" */
1653         if (el != NULL) {
1654                 const char *dns_attrs[] = { "dNSHostName", NULL };
1655                 msg = ldb_msg_new(ac->msg);
1656                 if (msg == NULL) {
1657                         return ldb_module_oom(ac->module);
1658                 }
1659                 ret = ldb_msg_add(msg, el, 0);
1660                 if (ret != LDB_SUCCESS) {
1661                         return ret;
1662                 }
1663                 dns_hostname = talloc_steal(ac,
1664                                             ldb_msg_find_attr_as_string(msg, "dNSHostName", NULL));
1665                 talloc_free(msg);
1666
1667                 ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn,
1668                                             dns_attrs, DSDB_FLAG_NEXT_MODULE, ac->req);
1669                 if (ret == LDB_SUCCESS) {
1670                         old_dns_hostname = ldb_msg_find_attr_as_string(res->msgs[0], "dNSHostName", NULL);
1671                 }
1672         }
1673
1674         /* Create a temporary message for fetching the "sAMAccountName" */
1675         if (el2 != NULL) {
1676                 char *tempstr, *tempstr2;
1677                 const char *acct_attrs[] = { "sAMAccountName", NULL };
1678
1679                 msg = ldb_msg_new(ac->msg);
1680                 if (msg == NULL) {
1681                         return ldb_module_oom(ac->module);
1682                 }
1683                 ret = ldb_msg_add(msg, el2, 0);
1684                 if (ret != LDB_SUCCESS) {
1685                         return ret;
1686                 }
1687                 tempstr = talloc_strdup(ac,
1688                                         ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL));
1689                 talloc_free(msg);
1690
1691                 ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, acct_attrs,
1692                                             DSDB_FLAG_NEXT_MODULE, ac->req);
1693                 if (ret == LDB_SUCCESS) {
1694                         tempstr2 = talloc_strdup(ac,
1695                                                  ldb_msg_find_attr_as_string(res->msgs[0],
1696                                                                              "sAMAccountName", NULL));
1697                 }
1698
1699
1700                 /* The "sAMAccountName" needs some additional trimming: we need
1701                  * to remove the trailing "$"s if they exist. */
1702                 if ((tempstr != NULL) && (tempstr[0] != '\0') &&
1703                     (tempstr[strlen(tempstr) - 1] == '$')) {
1704                         tempstr[strlen(tempstr) - 1] = '\0';
1705                 }
1706                 if ((tempstr2 != NULL) && (tempstr2[0] != '\0') &&
1707                     (tempstr2[strlen(tempstr2) - 1] == '$')) {
1708                         tempstr2[strlen(tempstr2) - 1] = '\0';
1709                 }
1710                 sam_accountname = tempstr;
1711                 old_sam_accountname = tempstr2;
1712         }
1713
1714         if (old_dns_hostname == NULL) {
1715                 /* we cannot change when the old name is unknown */
1716                 dns_hostname = NULL;
1717         }
1718         if ((old_dns_hostname != NULL) && (dns_hostname != NULL) &&
1719             (strcasecmp(old_dns_hostname, dns_hostname) == 0)) {
1720                 /* The "dNSHostName" didn't change */
1721                 dns_hostname = NULL;
1722         }
1723
1724         if (old_sam_accountname == NULL) {
1725                 /* we cannot change when the old name is unknown */
1726                 sam_accountname = NULL;
1727         }
1728         if ((old_sam_accountname != NULL) && (sam_accountname != NULL) &&
1729             (strcasecmp(old_sam_accountname, sam_accountname) == 0)) {
1730                 /* The "sAMAccountName" didn't change */
1731                 sam_accountname = NULL;
1732         }
1733
1734         if ((dns_hostname == NULL) && (sam_accountname == NULL)) {
1735                 /* Well, there are information missing (old name(s)) or the
1736                  * names didn't change. We've nothing to do and can exit here */
1737                 return LDB_SUCCESS;
1738         }
1739
1740         /* Potential "servicePrincipalName" changes in the same request have to
1741          * be handled before the update (Windows behaviour). */
1742         el = ldb_msg_find_element(ac->msg, "servicePrincipalName");
1743         if (el != NULL) {
1744                 msg = ldb_msg_new(ac->msg);
1745                 if (msg == NULL) {
1746                         return ldb_module_oom(ac->module);
1747                 }
1748                 msg->dn = ac->msg->dn;
1749
1750                 do {
1751                         ret = ldb_msg_add(msg, el, el->flags);
1752                         if (ret != LDB_SUCCESS) {
1753                                 return ret;
1754                         }
1755
1756                         ldb_msg_remove_element(ac->msg, el);
1757
1758                         el = ldb_msg_find_element(ac->msg,
1759                                                   "servicePrincipalName");
1760                 } while (el != NULL);
1761
1762                 ret = dsdb_module_modify(ac->module, msg,
1763                                          DSDB_FLAG_NEXT_MODULE, ac->req);
1764                 if (ret != LDB_SUCCESS) {
1765                         return ret;
1766                 }
1767                 talloc_free(msg);
1768         }
1769
1770         /* Fetch the "servicePrincipalName"s if any */
1771         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1772                                  DSDB_FLAG_NEXT_MODULE, ac->req, NULL);
1773         if (ret != LDB_SUCCESS) {
1774                 return ret;
1775         }
1776         if ((res->count != 1) || (res->msgs[0]->num_elements > 1)) {
1777                 return ldb_operr(ldb);
1778         }
1779
1780         if (res->msgs[0]->num_elements == 1) {
1781                 /* Yes, we do have "servicePrincipalName"s. First we update them
1782                  * locally, that means we do always substitute the current
1783                  * "dNSHostName" with the new one and/or "sAMAccountName"
1784                  * without "$" with the new one and then we append this to the
1785                  * modification request (Windows behaviour). */
1786
1787                 for (i = 0; i < res->msgs[0]->elements[0].num_values; i++) {
1788                         char *old_str, *new_str, *pos;
1789                         const char *tok;
1790
1791                         old_str = (char *)
1792                                 res->msgs[0]->elements[0].values[i].data;
1793
1794                         new_str = talloc_strdup(ac->msg,
1795                                                 strtok_r(old_str, "/", &pos));
1796                         if (new_str == NULL) {
1797                                 return ldb_module_oom(ac->module);
1798                         }
1799
1800                         while ((tok = strtok_r(NULL, "/", &pos)) != NULL) {
1801                                 if ((dns_hostname != NULL) &&
1802                                     (strcasecmp(tok, old_dns_hostname) == 0)) {
1803                                         tok = dns_hostname;
1804                                 }
1805                                 if ((sam_accountname != NULL) &&
1806                                     (strcasecmp(tok, old_sam_accountname) == 0)) {
1807                                         tok = sam_accountname;
1808                                 }
1809
1810                                 new_str = talloc_asprintf(ac->msg, "%s/%s",
1811                                                           new_str, tok);
1812                                 if (new_str == NULL) {
1813                                         return ldb_module_oom(ac->module);
1814                                 }
1815                         }
1816
1817                         ret = ldb_msg_add_string(ac->msg,
1818                                                  "servicePrincipalName",
1819                                                  new_str);
1820                         if (ret != LDB_SUCCESS) {
1821                                 return ret;
1822                         }
1823                 }
1824
1825                 el = ldb_msg_find_element(ac->msg, "servicePrincipalName");
1826                 el->flags = LDB_FLAG_MOD_REPLACE;
1827         }
1828
1829         talloc_free(res);
1830
1831         return LDB_SUCCESS;
1832 }
1833
1834
1835 /* add */
1836 static int samldb_add(struct ldb_module *module, struct ldb_request *req)
1837 {
1838         struct ldb_context *ldb;
1839         struct samldb_ctx *ac;
1840         int ret;
1841
1842         ldb = ldb_module_get_ctx(module);
1843         ldb_debug(ldb, LDB_DEBUG_TRACE, "samldb_add\n");
1844
1845         /* do not manipulate our control entries */
1846         if (ldb_dn_is_special(req->op.add.message->dn)) {
1847                 return ldb_next_request(module, req);
1848         }
1849
1850         ac = samldb_ctx_init(module, req);
1851         if (ac == NULL) {
1852                 return ldb_operr(ldb);
1853         }
1854
1855         /* build the new msg */
1856         ac->msg = ldb_msg_copy_shallow(ac, req->op.add.message);
1857         if (ac->msg == NULL) {
1858                 talloc_free(ac);
1859                 ldb_debug(ldb, LDB_DEBUG_FATAL,
1860                           "samldb_add: ldb_msg_copy_shallow failed!\n");
1861                 return ldb_operr(ldb);
1862         }
1863
1864         if (samdb_find_attribute(ldb, ac->msg,
1865                                  "objectclass", "user") != NULL) {
1866                 ac->type = "user";
1867
1868                 ret = samldb_prim_group_trigger(ac);
1869                 if (ret != LDB_SUCCESS) {
1870                         return ret;
1871                 }
1872
1873                 ret = samldb_objectclass_trigger(ac);
1874                 if (ret != LDB_SUCCESS) {
1875                         return ret;
1876                 }
1877
1878                 return samldb_fill_object(ac);
1879         }
1880
1881         if (samdb_find_attribute(ldb, ac->msg,
1882                                  "objectclass", "group") != NULL) {
1883                 ac->type = "group";
1884
1885                 ret = samldb_objectclass_trigger(ac);
1886                 if (ret != LDB_SUCCESS) {
1887                         return ret;
1888                 }
1889
1890                 return samldb_fill_object(ac);
1891         }
1892
1893         /* perhaps a foreignSecurityPrincipal? */
1894         if (samdb_find_attribute(ldb, ac->msg,
1895                                  "objectclass",
1896                                  "foreignSecurityPrincipal") != NULL) {
1897                 return samldb_fill_foreignSecurityPrincipal_object(ac);
1898         }
1899
1900         if (samdb_find_attribute(ldb, ac->msg,
1901                                  "objectclass", "classSchema") != NULL) {
1902                 ret = samldb_schema_info_update(ac);
1903                 if (ret != LDB_SUCCESS) {
1904                         talloc_free(ac);
1905                         return ret;
1906                 }
1907
1908                 ac->type = "classSchema";
1909                 return samldb_fill_object(ac);
1910         }
1911
1912         if (samdb_find_attribute(ldb, ac->msg,
1913                                  "objectclass", "attributeSchema") != NULL) {
1914                 ret = samldb_schema_info_update(ac);
1915                 if (ret != LDB_SUCCESS) {
1916                         talloc_free(ac);
1917                         return ret;
1918                 }
1919
1920                 ac->type = "attributeSchema";
1921                 return samldb_fill_object(ac);
1922         }
1923
1924         talloc_free(ac);
1925
1926         /* nothing matched, go on */
1927         return ldb_next_request(module, req);
1928 }
1929
1930 /* modify */
1931 static int samldb_modify(struct ldb_module *module, struct ldb_request *req)
1932 {
1933         struct ldb_context *ldb;
1934         struct samldb_ctx *ac;
1935         struct ldb_message_element *el, *el2;
1936         bool modified = false;
1937         int ret;
1938
1939         if (ldb_dn_is_special(req->op.mod.message->dn)) {
1940                 /* do not manipulate our control entries */
1941                 return ldb_next_request(module, req);
1942         }
1943
1944         ldb = ldb_module_get_ctx(module);
1945
1946         /* make sure that "objectSid" is not specified */
1947         el = ldb_msg_find_element(req->op.mod.message, "objectSid");
1948         if (el != NULL) {
1949                 ldb_set_errstring(ldb,
1950                                   "samldb: objectSid must not be specified!");
1951                 return LDB_ERR_UNWILLING_TO_PERFORM;
1952         }
1953         /* make sure that "sAMAccountType" is not specified */
1954         el = ldb_msg_find_element(req->op.mod.message, "sAMAccountType");
1955         if (el != NULL) {
1956                 ldb_set_errstring(ldb,
1957                                   "samldb: sAMAccountType must not be specified!");
1958                 return LDB_ERR_UNWILLING_TO_PERFORM;
1959         }
1960         /* make sure that "isCriticalSystemObject" is not specified */
1961         el = ldb_msg_find_element(req->op.mod.message, "isCriticalSystemObject");
1962         if (el != NULL) {
1963                 if (ldb_request_get_control(req, LDB_CONTROL_RELAX_OID) == NULL) {
1964                         ldb_set_errstring(ldb,
1965                                           "samldb: isCriticalSystemObject must not be specified!");
1966                         return LDB_ERR_UNWILLING_TO_PERFORM;
1967                 }
1968         }
1969
1970         /* msDS-IntId is not allowed to be modified
1971          * except when modification comes from replication */
1972         if (ldb_msg_find_element(req->op.mod.message, "msDS-IntId")) {
1973                 if (!ldb_request_get_control(req,
1974                                              DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
1975                         return LDB_ERR_CONSTRAINT_VIOLATION;
1976                 }
1977         }
1978
1979         ac = samldb_ctx_init(module, req);
1980         if (ac == NULL) {
1981                 return ldb_operr(ldb);
1982         }
1983
1984         /* build the new msg */
1985         ac->msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
1986         if (ac->msg == NULL) {
1987                 talloc_free(ac);
1988                 ldb_debug(ldb, LDB_DEBUG_FATAL,
1989                           "samldb_modify: ldb_msg_copy_shallow failed!\n");
1990                 return ldb_operr(ldb);
1991         }
1992
1993         el = ldb_msg_find_element(ac->msg, "primaryGroupID");
1994         if (el != NULL) {
1995                 ret = samldb_prim_group_change(ac);
1996                 if (ret != LDB_SUCCESS) {
1997                         return ret;
1998                 }
1999         }
2000
2001         el = ldb_msg_find_element(ac->msg, "userAccountControl");
2002         if (el != NULL) {
2003                 modified = true;
2004                 ret = samldb_user_account_control_change(ac);
2005                 if (ret != LDB_SUCCESS) {
2006                         return ret;
2007                 }
2008         }
2009
2010         el = ldb_msg_find_element(ac->msg, "groupType");
2011         if (el != NULL) {
2012                 modified = true;
2013                 ret = samldb_group_type_change(ac);
2014                 if (ret != LDB_SUCCESS) {
2015                         return ret;
2016                 }
2017         }
2018
2019         el = ldb_msg_find_element(ac->msg, "sAMAccountName");
2020         if (el != NULL) {
2021                 ret = samldb_sam_accountname_check(ac);
2022                 if (ret != LDB_SUCCESS) {
2023                         return ret;
2024                 }
2025         }
2026
2027         el = ldb_msg_find_element(ac->msg, "member");
2028         if (el != NULL) {
2029                 ret = samldb_member_check(ac);
2030                 if (ret != LDB_SUCCESS) {
2031                         return ret;
2032                 }
2033         }
2034
2035         el = ldb_msg_find_element(ac->msg, "description");
2036         if (el != NULL) {
2037                 ret = samldb_description_check(ac, &modified);
2038                 if (ret != LDB_SUCCESS) {
2039                         return ret;
2040                 }
2041         }
2042
2043         el = ldb_msg_find_element(ac->msg, "dNSHostName");
2044         el2 = ldb_msg_find_element(ac->msg, "sAMAccountName");
2045         if ((el != NULL) || (el2 != NULL)) {
2046                 modified = true;
2047                 ret = samldb_service_principal_names_change(ac);
2048                 if (ret != LDB_SUCCESS) {
2049                         return ret;
2050                 }
2051         }
2052
2053         if (modified) {
2054                 struct ldb_request *child_req;
2055
2056                 /* Now perform the real modifications as a child request */
2057                 ret = ldb_build_mod_req(&child_req, ldb, ac,
2058                                         ac->msg,
2059                                         req->controls,
2060                                         req, dsdb_next_callback,
2061                                         req);
2062                 LDB_REQ_SET_LOCATION(child_req);
2063                 if (ret != LDB_SUCCESS) {
2064                         return ret;
2065                 }
2066
2067                 return ldb_next_request(module, child_req);
2068         }
2069
2070         talloc_free(ac);
2071
2072         /* no change which interests us, go on */
2073         return ldb_next_request(module, req);
2074 }
2075
2076 /* delete */
2077
2078 static int samldb_prim_group_users_check(struct samldb_ctx *ac)
2079 {
2080         struct ldb_context *ldb;
2081         struct dom_sid *sid;
2082         uint32_t rid;
2083         NTSTATUS status;
2084         int ret;
2085         struct ldb_result *res;
2086         const char *attrs[] = { "objectSid", NULL };
2087         const char *noattrs[] = { NULL };
2088
2089         ldb = ldb_module_get_ctx(ac->module);
2090
2091         /* Finds out the SID/RID of the SAM object */
2092         ret = dsdb_module_search_dn(ac->module, ac, &res, ac->req->op.del.dn, attrs, DSDB_FLAG_NEXT_MODULE, ac->req);
2093         if (ret != LDB_SUCCESS) {
2094                 return ret;
2095         }
2096
2097         sid = samdb_result_dom_sid(ac, res->msgs[0], "objectSid");
2098         if (sid == NULL) {
2099                 /* No SID - it might not be a SAM object - therefore ok */
2100                 return LDB_SUCCESS;
2101         }
2102         status = dom_sid_split_rid(ac, sid, NULL, &rid);
2103         if (!NT_STATUS_IS_OK(status)) {
2104                 return ldb_operr(ldb);
2105         }
2106         if (rid == 0) {
2107                 /* Special object (security principal?) */
2108                 return LDB_SUCCESS;
2109         }
2110
2111         /* Deny delete requests from groups which are primary ones */
2112         ret = dsdb_module_search(ac->module, ac, &res, NULL, LDB_SCOPE_SUBTREE, noattrs,
2113                                  DSDB_FLAG_NEXT_MODULE,
2114                                  ac->req,
2115                                  "(&(primaryGroupID=%u)(objectClass=user))", rid);
2116         if (ret != LDB_SUCCESS) {
2117                 return ret;
2118         }
2119         if (res->count > 0) {
2120                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
2121         }
2122
2123         return LDB_SUCCESS;
2124 }
2125
2126 static int samldb_delete(struct ldb_module *module, struct ldb_request *req)
2127 {
2128         struct samldb_ctx *ac;
2129         int ret;
2130
2131         if (ldb_dn_is_special(req->op.del.dn)) {
2132                 /* do not manipulate our control entries */
2133                 return ldb_next_request(module, req);
2134         }
2135
2136         ac = samldb_ctx_init(module, req);
2137         if (ac == NULL) {
2138                 return ldb_operr(ldb_module_get_ctx(module));
2139         }
2140
2141         ret = samldb_prim_group_users_check(ac);
2142         if (ret != LDB_SUCCESS) {
2143                 return ret;
2144         }
2145
2146         talloc_free(ac);
2147
2148         return ldb_next_request(module, req);
2149 }
2150
2151 /* extended */
2152
2153 static int samldb_extended_allocate_rid_pool(struct ldb_module *module, struct ldb_request *req)
2154 {
2155         struct ldb_context *ldb = ldb_module_get_ctx(module);
2156         struct dsdb_fsmo_extended_op *exop;
2157         int ret;
2158
2159         exop = talloc_get_type(req->op.extended.data,
2160                                struct dsdb_fsmo_extended_op);
2161         if (!exop) {
2162                 ldb_set_errstring(ldb,
2163                                   "samldb_extended_allocate_rid_pool: invalid extended data");
2164                 return LDB_ERR_PROTOCOL_ERROR;
2165         }
2166
2167         ret = ridalloc_allocate_rid_pool_fsmo(module, exop, req);
2168         if (ret != LDB_SUCCESS) {
2169                 return ret;
2170         }
2171
2172         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2173 }
2174
2175 static int samldb_extended(struct ldb_module *module, struct ldb_request *req)
2176 {
2177         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_ALLOCATE_RID_POOL) == 0) {
2178                 return samldb_extended_allocate_rid_pool(module, req);
2179         }
2180
2181         return ldb_next_request(module, req);
2182 }
2183
2184
2185 static const struct ldb_module_ops ldb_samldb_module_ops = {
2186         .name          = "samldb",
2187         .add           = samldb_add,
2188         .modify        = samldb_modify,
2189         .del           = samldb_delete,
2190         .extended      = samldb_extended
2191 };
2192
2193
2194 int ldb_samldb_module_init(const char *version)
2195 {
2196         LDB_MODULE_CHECK_VERSION(version);
2197         return ldb_register_module(&ldb_samldb_module_ops);
2198 }