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                         /* "isCriticalSystemObject" might be set */
 915                         if (user_account_control &
 916                             (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
 917                                 ret = ldb_msg_add_string(ac->msg, "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                         } else if (user_account_control & UF_WORKSTATION_TRUST_ACCOUNT) {
 926                                 ret = ldb_msg_add_string(ac->msg, "isCriticalSystemObject",
 927                                                          "FALSE");
 928                                 if (ret != LDB_SUCCESS) {
 929                                         return ret;
 930                                 }
 931                                 el2 = ldb_msg_find_element(ac->msg,
 932                                                            "isCriticalSystemObject");
 933                                 el2->flags = LDB_FLAG_MOD_REPLACE;
 934                         }
 935
 936                         /* Step 1.4: "userAccountControl" -> "primaryGroupID" mapping */
 937                         if (!ldb_msg_find_element(ac->msg, "primaryGroupID")) {
 938                                 uint32_t rid = ds_uf2prim_group_rid(user_account_control);
 939                                 ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
 940                                                          "primaryGroupID", rid);
 941                                 if (ret != LDB_SUCCESS) {
 942                                         return ret;
 943                                 }
 944                                 el2 = ldb_msg_find_element(ac->msg,
 945                                                            "primaryGroupID");
 946                                 el2->flags = LDB_FLAG_MOD_REPLACE;
 947                         }
 948
 949                         /* Step 1.5: Add additional flags when needed */
 950                         /* Obviously this is done when the "userAccountControl"
 951                          * has been generated here (tested against Windows
 952                          * Server) */
 953                         if (uac_generated) {
 954                                 user_account_control |= UF_ACCOUNTDISABLE;
 955                                 user_account_control |= UF_PASSWD_NOTREQD;
 956
 957                                 ret = samdb_msg_set_uint(ldb, ac->msg, ac->msg,
 958                                                          "userAccountControl",
 959                                                          user_account_control);
 960                                 if (ret != LDB_SUCCESS) {
 961                                         return ret;
 962                                 }
 963                         }
 964                 }
 965
 966         } else if (strcmp(ac->type, "group") == 0) {
 967                 const char *tempstr;
 968
 969                 /* Step 2.2: Default values */
 970                 tempstr = talloc_asprintf(ac->msg, "%d",
 971                                           GTYPE_SECURITY_GLOBAL_GROUP);
 972                 if (tempstr == NULL) return ldb_operr(ldb);
 973                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 974                         "groupType", tempstr);
 975                 if (ret != LDB_SUCCESS) return ret;
 976
 977                 /* Step 2.3: "groupType" -> "sAMAccountType" */
 978                 el = ldb_msg_find_element(ac->msg, "groupType");
 979                 if (el != NULL) {
 980                         uint32_t group_type, account_type;
 981
 982                         group_type = ldb_msg_find_attr_as_uint(ac->msg,
 983                                                                "groupType", 0);
 984
 985                         /* The creation of builtin groups requires the
 986                          * RELAX control */
 987                         if (group_type == GTYPE_SECURITY_BUILTIN_LOCAL_GROUP) {
 988                                 if (ldb_request_get_control(ac->req,
 989                                                             LDB_CONTROL_RELAX_OID) == NULL) {
 990                                         return LDB_ERR_UNWILLING_TO_PERFORM;
 991                                 }
 992                         }
 993
 994                         account_type = ds_gtype2atype(group_type);
 995                         if (account_type == 0) {
 996                                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
 997                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 998                         }
 999                         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
1000                                                  "sAMAccountType",
1001                                                  account_type);
1002                         if (ret != LDB_SUCCESS) {
1003                                 return ret;
1004                         }
1005                         el2 = ldb_msg_find_element(ac->msg, "sAMAccountType");
1006                         el2->flags = LDB_FLAG_MOD_REPLACE;
1007                 }
1008         }
1009
1010         return LDB_SUCCESS;
1011 }
1012
1013 /*
1014  * "Primary group ID" trigger (MS-SAMR 3.1.1.8.2)
1015  *
1016  * Has to be invoked on "add" and "modify" operations on "user" and "computer"
1017  * objects.
1018  * ac->msg contains the "add"/"modify" message
1019  */
1020
1021 static int samldb_prim_group_set(struct samldb_ctx *ac)
1022 {
1023         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1024         uint32_t rid;
1025         struct dom_sid *sid;
1026         struct ldb_result *res;
1027         int ret;
1028         const char *noattrs[] = { NULL };
1029
1030         rid = ldb_msg_find_attr_as_uint(ac->msg, "primaryGroupID", (uint32_t) -1);
1031         if (rid == (uint32_t) -1) {
1032                 /* we aren't affected of any primary group set */
1033                 return LDB_SUCCESS;
1034
1035         } else if (!ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
1036                 ldb_set_errstring(ldb,
1037                                   "The primary group isn't settable on add operations!");
1038                 return LDB_ERR_UNWILLING_TO_PERFORM;
1039         }
1040
1041         sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), rid);
1042         if (sid == NULL) {
1043                 return ldb_operr(ldb);
1044         }
1045
1046         ret = dsdb_module_search(ac->module, ac, &res, NULL, LDB_SCOPE_SUBTREE,
1047                                  noattrs, DSDB_FLAG_NEXT_MODULE,
1048                                  ac->req,
1049                                  "(objectSid=%s)",
1050                                  ldap_encode_ndr_dom_sid(ac, sid));
1051         if (ret != LDB_SUCCESS) {
1052                 return ret;
1053         }
1054         if (res->count != 1) {
1055                 talloc_free(res);
1056                 ldb_asprintf_errstring(ldb,
1057                                        "Failed to find primary group with RID %u!",
1058                                        rid);
1059                 return LDB_ERR_UNWILLING_TO_PERFORM;
1060         }
1061         talloc_free(res);
1062
1063         return LDB_SUCCESS;
1064 }
1065
1066 static int samldb_prim_group_change(struct samldb_ctx *ac)
1067 {
1068         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1069         const char * attrs[] = { "primaryGroupID", "memberOf", NULL };
1070         struct ldb_result *res, *group_res;
1071         struct ldb_message_element *el;
1072         struct ldb_message *msg;
1073         uint32_t prev_rid, new_rid;
1074         struct dom_sid *prev_sid, *new_sid;
1075         struct ldb_dn *prev_prim_group_dn, *new_prim_group_dn;
1076         int ret;
1077         const char *noattrs[] = { NULL };
1078
1079         el = dsdb_get_single_valued_attr(ac->msg, "primaryGroupID",
1080                                          ac->req->operation);
1081         if (el == NULL) {
1082                 /* we are not affected */
1083                 return LDB_SUCCESS;
1084         }
1085
1086         /* Fetch information from the existing object */
1087
1088         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1089                                  DSDB_FLAG_NEXT_MODULE, ac->req, NULL);
1090         if (ret != LDB_SUCCESS) {
1091                 return ret;
1092         }
1093         if (res->count != 1) {
1094                 return ldb_operr(ldb);
1095         }
1096
1097         /* Finds out the DN of the old primary group */
1098
1099         prev_rid = ldb_msg_find_attr_as_uint(res->msgs[0], "primaryGroupID",
1100                                              (uint32_t) -1);
1101         if (prev_rid == (uint32_t) -1) {
1102                 /* User objects do always have a mandatory "primaryGroupID"
1103                  * attribute. If this doesn't exist then the object is of the
1104                  * wrong type. This is the exact Windows error code */
1105                 return LDB_ERR_OBJECT_CLASS_VIOLATION;
1106         }
1107
1108         prev_sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), prev_rid);
1109         if (prev_sid == NULL) {
1110                 return ldb_operr(ldb);
1111         }
1112
1113         /* Finds out the DN of the new primary group
1114          * Notice: in order to parse the primary group ID correctly we create
1115          * a temporary message here. */
1116
1117         msg = ldb_msg_new(ac->msg);
1118         if (msg == NULL) {
1119                 return ldb_module_oom(ac->module);
1120         }
1121         ret = ldb_msg_add(msg, el, 0);
1122         if (ret != LDB_SUCCESS) {
1123                 return ret;
1124         }
1125         new_rid = ldb_msg_find_attr_as_uint(msg, "primaryGroupID", (uint32_t) -1);
1126         talloc_free(msg);
1127         if (new_rid == (uint32_t) -1) {
1128                 /* we aren't affected of any primary group change */
1129                 return LDB_SUCCESS;
1130         }
1131
1132         if (prev_rid == new_rid) {
1133                 return LDB_SUCCESS;
1134         }
1135
1136         ret = dsdb_module_search(ac->module, ac, &group_res, NULL, LDB_SCOPE_SUBTREE,
1137                                  noattrs, DSDB_FLAG_NEXT_MODULE,
1138                                  ac->req,
1139                                  "(objectSid=%s)",
1140                                  ldap_encode_ndr_dom_sid(ac, prev_sid));
1141         if (ret != LDB_SUCCESS) {
1142                 return ret;
1143         }
1144         if (group_res->count != 1) {
1145                 return ldb_operr(ldb);
1146         }
1147         prev_prim_group_dn = group_res->msgs[0]->dn;
1148
1149         new_sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), new_rid);
1150         if (new_sid == NULL) {
1151                 return ldb_operr(ldb);
1152         }
1153
1154         ret = dsdb_module_search(ac->module, ac, &group_res, NULL, LDB_SCOPE_SUBTREE,
1155                                  noattrs, DSDB_FLAG_NEXT_MODULE,
1156                                  ac->req,
1157                                  "(objectSid=%s)",
1158                                  ldap_encode_ndr_dom_sid(ac, new_sid));
1159         if (ret != LDB_SUCCESS) {
1160                 return ret;
1161         }
1162         if (group_res->count != 1) {
1163                 /* Here we know if the specified new primary group candidate is
1164                  * valid or not. */
1165                 return LDB_ERR_UNWILLING_TO_PERFORM;
1166         }
1167         new_prim_group_dn = group_res->msgs[0]->dn;
1168
1169         /* We need to be already a normal member of the new primary
1170          * group in order to be successful. */
1171         el = samdb_find_attribute(ldb, res->msgs[0], "memberOf",
1172                                   ldb_dn_get_linearized(new_prim_group_dn));
1173         if (el == NULL) {
1174                 return LDB_ERR_UNWILLING_TO_PERFORM;
1175         }
1176
1177         /* Remove the "member" attribute on the new primary group */
1178         msg = ldb_msg_new(ac->msg);
1179         if (msg == NULL) {
1180                 return ldb_module_oom(ac->module);
1181         }
1182         msg->dn = new_prim_group_dn;
1183
1184         ret = samdb_msg_add_delval(ldb, msg, msg, "member",
1185                                    ldb_dn_get_linearized(ac->msg->dn));
1186         if (ret != LDB_SUCCESS) {
1187                 return ret;
1188         }
1189
1190         ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE, ac->req);
1191         if (ret != LDB_SUCCESS) {
1192                 return ret;
1193         }
1194         talloc_free(msg);
1195
1196         /* Add a "member" attribute for the previous primary group */
1197         msg = ldb_msg_new(ac->msg);
1198         if (msg == NULL) {
1199                 return ldb_module_oom(ac->module);
1200         }
1201         msg->dn = prev_prim_group_dn;
1202
1203         ret = samdb_msg_add_addval(ldb, msg, msg, "member",
1204                                    ldb_dn_get_linearized(ac->msg->dn));
1205         if (ret != LDB_SUCCESS) {
1206                 return ret;
1207         }
1208
1209         ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE, ac->req);
1210         if (ret != LDB_SUCCESS) {
1211                 return ret;
1212         }
1213         talloc_free(msg);
1214
1215         return LDB_SUCCESS;
1216 }
1217
1218 static int samldb_prim_group_trigger(struct samldb_ctx *ac)
1219 {
1220         int ret;
1221
1222         if (ac->req->operation == LDB_ADD) {
1223                 ret = samldb_prim_group_set(ac);
1224         } else {
1225                 ret = samldb_prim_group_change(ac);
1226         }
1227
1228         return ret;
1229 }
1230
1231
1232 /**
1233  * This function is called on LDB modify operations. It performs some additions/
1234  * replaces on the current LDB message when "userAccountControl" changes.
1235  */
1236 static int samldb_user_account_control_change(struct samldb_ctx *ac)
1237 {
1238         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1239         uint32_t user_account_control, old_user_account_control, account_type;
1240         struct ldb_message_element *el;
1241         struct ldb_message *tmp_msg;
1242         int ret;
1243         struct ldb_result *res;
1244         const char *attrs[] = { "userAccountControl", NULL };
1245
1246         el = dsdb_get_single_valued_attr(ac->msg, "userAccountControl",
1247                                          ac->req->operation);
1248         if (el == NULL) {
1249                 /* we are not affected */
1250                 return LDB_SUCCESS;
1251         }
1252
1253         /* Create a temporary message for fetching the "userAccountControl" */
1254         tmp_msg = ldb_msg_new(ac->msg);
1255         if (tmp_msg == NULL) {
1256                 return ldb_module_oom(ac->module);
1257         }
1258         ret = ldb_msg_add(tmp_msg, el, 0);
1259         if (ret != LDB_SUCCESS) {
1260                 return ret;
1261         }
1262         user_account_control = ldb_msg_find_attr_as_uint(tmp_msg,
1263                                                          "userAccountControl",
1264                                                          0);
1265         talloc_free(tmp_msg);
1266
1267         /* Temporary duplicate accounts aren't allowed */
1268         if ((user_account_control & UF_TEMP_DUPLICATE_ACCOUNT) != 0) {
1269                 return LDB_ERR_OTHER;
1270         }
1271
1272         /* Fetch the old "userAccountControl" */
1273         ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, attrs,
1274                                     DSDB_FLAG_NEXT_MODULE, ac->req);
1275         if (ret != LDB_SUCCESS) {
1276                 return ret;
1277         }
1278         old_user_account_control = ldb_msg_find_attr_as_uint(res->msgs[0], "userAccountControl", 0);
1279         if (old_user_account_control == 0) {
1280                 return ldb_operr(ldb);
1281         }
1282
1283         /*
1284          * The functions "ds_uf2atype" and "ds_uf2prim_group_rid" are used as
1285          * detectors for account type changes.
1286          * So if the account type does change then we need to adjust the
1287          * "sAMAccountType", the "isCriticalSystemObject" and the
1288          * "primaryGroupID" attribute.
1289          */
1290         if ((ds_uf2atype(user_account_control)
1291              == ds_uf2atype(old_user_account_control)) &&
1292             (ds_uf2prim_group_rid(user_account_control)
1293              == ds_uf2prim_group_rid(old_user_account_control))) {
1294                 return LDB_SUCCESS;
1295         }
1296
1297         account_type = ds_uf2atype(user_account_control);
1298         if (account_type == 0) {
1299                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
1300                 return LDB_ERR_UNWILLING_TO_PERFORM;
1301         }
1302         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "sAMAccountType",
1303                                  account_type);
1304         if (ret != LDB_SUCCESS) {
1305                 return ret;
1306         }
1307         el = ldb_msg_find_element(ac->msg, "sAMAccountType");
1308         el->flags = LDB_FLAG_MOD_REPLACE;
1309
1310         /* "isCriticalSystemObject" might be set/changed */
1311         if (user_account_control
1312             & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
1313                 ret = ldb_msg_add_string(ac->msg, "isCriticalSystemObject",
1314                                          "TRUE");
1315                 if (ret != LDB_SUCCESS) {
1316                         return ret;
1317                 }
1318                 el = ldb_msg_find_element(ac->msg,
1319                                            "isCriticalSystemObject");
1320                 el->flags = LDB_FLAG_MOD_REPLACE;
1321         } else if (user_account_control & UF_WORKSTATION_TRUST_ACCOUNT) {
1322                 ret = ldb_msg_add_string(ac->msg, "isCriticalSystemObject",
1323                                          "FALSE");
1324                 if (ret != LDB_SUCCESS) {
1325                         return ret;
1326                 }
1327                 el = ldb_msg_find_element(ac->msg,
1328                                            "isCriticalSystemObject");
1329                 el->flags = LDB_FLAG_MOD_REPLACE;
1330         }
1331
1332         if (!ldb_msg_find_element(ac->msg, "primaryGroupID")) {
1333                 uint32_t rid = ds_uf2prim_group_rid(user_account_control);
1334                 ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
1335                                          "primaryGroupID", rid);
1336                 if (ret != LDB_SUCCESS) {
1337                         return ret;
1338                 }
1339                 el = ldb_msg_find_element(ac->msg,
1340                                            "primaryGroupID");
1341                 el->flags = LDB_FLAG_MOD_REPLACE;
1342         }
1343
1344         return LDB_SUCCESS;
1345 }
1346
1347 static int samldb_group_type_change(struct samldb_ctx *ac)
1348 {
1349         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1350         uint32_t group_type, old_group_type, account_type;
1351         struct ldb_message_element *el;
1352         struct ldb_message *tmp_msg;
1353         int ret;
1354         struct ldb_result *res;
1355         const char *attrs[] = { "groupType", NULL };
1356
1357         el = dsdb_get_single_valued_attr(ac->msg, "groupType",
1358                                          ac->req->operation);
1359         if (el == NULL) {
1360                 /* we are not affected */
1361                 return LDB_SUCCESS;
1362         }
1363
1364         /* Create a temporary message for fetching the "groupType" */
1365         tmp_msg = ldb_msg_new(ac->msg);
1366         if (tmp_msg == NULL) {
1367                 return ldb_module_oom(ac->module);
1368         }
1369         ret = ldb_msg_add(tmp_msg, el, 0);
1370         if (ret != LDB_SUCCESS) {
1371                 return ret;
1372         }
1373         group_type = ldb_msg_find_attr_as_uint(tmp_msg, "groupType", 0);
1374         talloc_free(tmp_msg);
1375
1376         ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, attrs,
1377                                     DSDB_FLAG_NEXT_MODULE, ac->req);
1378         if (ret != LDB_SUCCESS) {
1379                 return ret;
1380         }
1381         old_group_type = ldb_msg_find_attr_as_uint(res->msgs[0], "groupType", 0);
1382         if (old_group_type == 0) {
1383                 return ldb_operr(ldb);
1384         }
1385
1386         /* Group type switching isn't so easy as it seems: We can only
1387          * change in this directions: global <-> universal <-> local
1388          * On each step also the group type itself
1389          * (security/distribution) is variable. */
1390
1391         if (ldb_request_get_control(ac->req, LDB_CONTROL_PROVISION_OID) == NULL) {
1392                 switch (group_type) {
1393                 case GTYPE_SECURITY_GLOBAL_GROUP:
1394                 case GTYPE_DISTRIBUTION_GLOBAL_GROUP:
1395                         /* change to "universal" allowed */
1396                         if ((old_group_type == GTYPE_SECURITY_DOMAIN_LOCAL_GROUP) ||
1397                         (old_group_type == GTYPE_DISTRIBUTION_DOMAIN_LOCAL_GROUP)) {
1398                                 ldb_set_errstring(ldb,
1399                                         "samldb: Change from security/distribution local group forbidden!");
1400                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1401                         }
1402                 break;
1403
1404                 case GTYPE_SECURITY_UNIVERSAL_GROUP:
1405                 case GTYPE_DISTRIBUTION_UNIVERSAL_GROUP:
1406                         /* each change allowed */
1407                 break;
1408                 case GTYPE_SECURITY_DOMAIN_LOCAL_GROUP:
1409                 case GTYPE_DISTRIBUTION_DOMAIN_LOCAL_GROUP:
1410                         /* change to "universal" allowed */
1411                         if ((old_group_type == GTYPE_SECURITY_GLOBAL_GROUP) ||
1412                         (old_group_type == GTYPE_DISTRIBUTION_GLOBAL_GROUP)) {
1413                                 ldb_set_errstring(ldb,
1414                                         "samldb: Change from security/distribution global group forbidden!");
1415                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1416                         }
1417                 break;
1418
1419                 case GTYPE_SECURITY_BUILTIN_LOCAL_GROUP:
1420                 default:
1421                         /* we don't allow this "groupType" values */
1422                         return LDB_ERR_UNWILLING_TO_PERFORM;
1423                 break;
1424                 }
1425         }
1426
1427         account_type =  ds_gtype2atype(group_type);
1428         if (account_type == 0) {
1429                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
1430                 return LDB_ERR_UNWILLING_TO_PERFORM;
1431         }
1432         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "sAMAccountType",
1433                                  account_type);
1434         if (ret != LDB_SUCCESS) {
1435                 return ret;
1436         }
1437         el = ldb_msg_find_element(ac->msg, "sAMAccountType");
1438         el->flags = LDB_FLAG_MOD_REPLACE;
1439
1440         return LDB_SUCCESS;
1441 }
1442
1443 static int samldb_sam_accountname_check(struct samldb_ctx *ac)
1444 {
1445         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1446         const char *no_attrs[] = { NULL };
1447         struct ldb_result *res;
1448         const char *sam_accountname, *enc_str;
1449         struct ldb_message_element *el;
1450         struct ldb_message *tmp_msg;
1451         int ret;
1452
1453         el = dsdb_get_single_valued_attr(ac->msg, "sAMAccountName",
1454                                          ac->req->operation);
1455         if (el == NULL) {
1456                 /* we are not affected */
1457                 return LDB_SUCCESS;
1458         }
1459
1460         /* Create a temporary message for fetching the "sAMAccountName" */
1461         tmp_msg = ldb_msg_new(ac->msg);
1462         if (tmp_msg == NULL) {
1463                 return ldb_module_oom(ac->module);
1464         }
1465         ret = ldb_msg_add(tmp_msg, el, 0);
1466         if (ret != LDB_SUCCESS) {
1467                 return ret;
1468         }
1469         sam_accountname = talloc_steal(ac,
1470                                        ldb_msg_find_attr_as_string(tmp_msg, "sAMAccountName", NULL));
1471         talloc_free(tmp_msg);
1472
1473         if (sam_accountname == NULL) {
1474                 /* The "sAMAccountName" cannot be nothing */
1475                 ldb_set_errstring(ldb,
1476                                   "samldb: Empty account names aren't allowed!");
1477                 return LDB_ERR_UNWILLING_TO_PERFORM;
1478         }
1479
1480         enc_str = ldb_binary_encode_string(ac, sam_accountname);
1481         if (enc_str == NULL) {
1482                 return ldb_module_oom(ac->module);
1483         }
1484
1485         /* Make sure that a "sAMAccountName" is only used once */
1486
1487         ret = dsdb_module_search(ac->module, ac, &res, NULL, LDB_SCOPE_SUBTREE, no_attrs,
1488                                  DSDB_FLAG_NEXT_MODULE, ac->req,
1489                                  "(sAMAccountName=%s)", enc_str);
1490         if (ret != LDB_SUCCESS) {
1491                 return ret;
1492         }
1493         if (res->count > 1) {
1494                 return ldb_operr(ldb);
1495         } else if (res->count == 1) {
1496                 if (ldb_dn_compare(res->msgs[0]->dn, ac->msg->dn) != 0) {
1497                         ldb_asprintf_errstring(ldb,
1498                                                "samldb: Account name (sAMAccountName) '%s' already in use!",
1499                                                sam_accountname);
1500                         return LDB_ERR_ENTRY_ALREADY_EXISTS;
1501                 }
1502         }
1503         talloc_free(res);
1504
1505         return LDB_SUCCESS;
1506 }
1507
1508 static int samldb_member_check(struct samldb_ctx *ac)
1509 {
1510         static const char * const attrs[] = { "objectSid", "member", NULL };
1511         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1512         struct ldb_message_element *el;
1513         struct ldb_dn *member_dn;
1514         struct dom_sid *sid;
1515         struct ldb_result *res;
1516         struct dom_sid *group_sid;
1517         unsigned int i, j;
1518         int cnt;
1519         int ret;
1520
1521         /* Fetch information from the existing object */
1522
1523         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1524                                  DSDB_FLAG_NEXT_MODULE, ac->req, NULL);
1525         if (ret != LDB_SUCCESS) {
1526                 return ret;
1527         }
1528         if (res->count != 1) {
1529                 return ldb_operr(ldb);
1530         }
1531
1532         group_sid = samdb_result_dom_sid(res, res->msgs[0], "objectSid");
1533         if (group_sid == NULL) {
1534                 return ldb_operr(ldb);
1535         }
1536
1537         /* We've to walk over all modification entries and consider the "member"
1538          * ones. */
1539         for (i = 0; i < ac->msg->num_elements; i++) {
1540                 if (ldb_attr_cmp(ac->msg->elements[i].name, "member") != 0) {
1541                         continue;
1542                 }
1543
1544                 el = &ac->msg->elements[i];
1545                 for (j = 0; j < el->num_values; j++) {
1546                         struct ldb_message_element *mo;
1547                         struct ldb_result *group_res;
1548                         const char *group_attrs[] = { "primaryGroupID" , NULL };
1549                         uint32_t prim_group_rid;
1550
1551                         member_dn = ldb_dn_from_ldb_val(ac, ldb,
1552                                                         &el->values[j]);
1553                         if (!ldb_dn_validate(member_dn)) {
1554                                 return ldb_operr(ldb);
1555                         }
1556
1557                         /* The "member" attribute can be modified with the
1558                          * following restrictions (beside a valid DN):
1559                          *
1560                          * - "add" operations can only be performed when the
1561                          *   member still doesn't exist - if not then return
1562                          *   ERR_ENTRY_ALREADY_EXISTS (not
1563                          *   ERR_ATTRIBUTE_OR_VALUE_EXISTS!)
1564                          * - "delete" operations can only be performed when the
1565                          *   member does exist - if not then return
1566                          *   ERR_UNWILLING_TO_PERFORM (not
1567                          *   ERR_NO_SUCH_ATTRIBUTE!)
1568                          * - primary group check
1569                          */
1570                         mo = samdb_find_attribute(ldb, res->msgs[0], "member",
1571                                                   ldb_dn_get_linearized(member_dn));
1572                         if (mo == NULL) {
1573                                 cnt = 0;
1574                         } else {
1575                                 cnt = 1;
1576                         }
1577
1578                         if ((cnt > 0) && (LDB_FLAG_MOD_TYPE(el->flags)
1579                             == LDB_FLAG_MOD_ADD)) {
1580                                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
1581                         }
1582                         if ((cnt == 0) && LDB_FLAG_MOD_TYPE(el->flags)
1583                             == LDB_FLAG_MOD_DELETE) {
1584                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1585                         }
1586
1587                         /* Denies to add "member"s to groups which are primary
1588                          * ones for them - in this case return
1589                          * ERR_ENTRY_ALREADY_EXISTS. */
1590
1591                         ret = dsdb_module_search_dn(ac->module, ac, &group_res,
1592                                                     member_dn, group_attrs,
1593                                                     DSDB_FLAG_NEXT_MODULE, ac->req);
1594                         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1595                                 /* member DN doesn't exist yet */
1596                                 continue;
1597                         }
1598                         if (ret != LDB_SUCCESS) {
1599                                 return ret;
1600                         }
1601                         prim_group_rid = ldb_msg_find_attr_as_uint(group_res->msgs[0], "primaryGroupID", (uint32_t)-1);
1602                         if (prim_group_rid == (uint32_t) -1) {
1603                                 /* the member hasn't to be a user account ->
1604                                  * therefore no check needed in this case. */
1605                                 continue;
1606                         }
1607
1608                         sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb),
1609                                               prim_group_rid);
1610                         if (sid == NULL) {
1611                                 return ldb_operr(ldb);
1612                         }
1613
1614                         if (dom_sid_equal(group_sid, sid)) {
1615                                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
1616                         }
1617                 }
1618         }
1619
1620         talloc_free(res);
1621
1622         return LDB_SUCCESS;
1623 }
1624
1625 /* SAM objects have special rules regarding the "description" attribute on
1626  * modify operations. */
1627 static int samldb_description_check(struct samldb_ctx *ac, bool *modified)
1628 {
1629         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1630         const char * const attrs[] = { "objectClass", "description", NULL };
1631         struct ldb_result *res;
1632         unsigned int i;
1633         int ret;
1634
1635         /* Fetch information from the existing object */
1636         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1637                                  DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED, ac->req,
1638                                  "(|(objectclass=user)(objectclass=group)(objectclass=samDomain)(objectclass=samServer))");
1639         if (ret != LDB_SUCCESS) {
1640                 /* don't treat it specially ... let normal error codes
1641                    happen from other places */
1642                 ldb_reset_err_string(ldb);
1643                 return LDB_SUCCESS;
1644         }
1645         if (res->count == 0) {
1646                 /* we didn't match the filter */
1647                 talloc_free(res);
1648                 return LDB_SUCCESS;
1649         }
1650
1651         /* We've to walk over all modification entries and consider the
1652          * "description" ones. */
1653         for (i = 0; i < ac->msg->num_elements; i++) {
1654                 if (ldb_attr_cmp(ac->msg->elements[i].name, "description") == 0) {
1655                         ac->msg->elements[i].flags |= LDB_FLAG_INTERNAL_FORCE_SINGLE_VALUE_CHECK;
1656                         *modified = true;
1657                 }
1658         }
1659
1660         talloc_free(res);
1661
1662         return LDB_SUCCESS;
1663 }
1664
1665 /* This trigger adapts the "servicePrincipalName" attributes if the
1666  * "dNSHostName" and/or "sAMAccountName" attribute change(s) */
1667 static int samldb_service_principal_names_change(struct samldb_ctx *ac)
1668 {
1669         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1670         struct ldb_message_element *el = NULL, *el2 = NULL;
1671         struct ldb_message *msg;
1672         const char *attrs[] = { "servicePrincipalName", NULL };
1673         struct ldb_result *res;
1674         const char *dns_hostname = NULL, *old_dns_hostname = NULL,
1675                    *sam_accountname = NULL, *old_sam_accountname = NULL;
1676         unsigned int i;
1677         int ret;
1678
1679         el = dsdb_get_single_valued_attr(ac->msg, "dNSHostName",
1680                                          ac->req->operation);
1681         el2 = dsdb_get_single_valued_attr(ac->msg, "sAMAccountName",
1682                                           ac->req->operation);
1683         if ((el == NULL) && (el2 == NULL)) {
1684                 /* we are not affected */
1685                 return LDB_SUCCESS;
1686         }
1687
1688         /* Create a temporary message for fetching the "dNSHostName" */
1689         if (el != NULL) {
1690                 const char *dns_attrs[] = { "dNSHostName", NULL };
1691                 msg = ldb_msg_new(ac->msg);
1692                 if (msg == NULL) {
1693                         return ldb_module_oom(ac->module);
1694                 }
1695                 ret = ldb_msg_add(msg, el, 0);
1696                 if (ret != LDB_SUCCESS) {
1697                         return ret;
1698                 }
1699                 dns_hostname = talloc_steal(ac,
1700                                             ldb_msg_find_attr_as_string(msg, "dNSHostName", NULL));
1701                 talloc_free(msg);
1702
1703                 ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn,
1704                                             dns_attrs, DSDB_FLAG_NEXT_MODULE, ac->req);
1705                 if (ret == LDB_SUCCESS) {
1706                         old_dns_hostname = ldb_msg_find_attr_as_string(res->msgs[0], "dNSHostName", NULL);
1707                 }
1708         }
1709
1710         /* Create a temporary message for fetching the "sAMAccountName" */
1711         if (el2 != NULL) {
1712                 char *tempstr, *tempstr2;
1713                 const char *acct_attrs[] = { "sAMAccountName", NULL };
1714
1715                 msg = ldb_msg_new(ac->msg);
1716                 if (msg == NULL) {
1717                         return ldb_module_oom(ac->module);
1718                 }
1719                 ret = ldb_msg_add(msg, el2, 0);
1720                 if (ret != LDB_SUCCESS) {
1721                         return ret;
1722                 }
1723                 tempstr = talloc_strdup(ac,
1724                                         ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL));
1725                 talloc_free(msg);
1726
1727                 ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, acct_attrs,
1728                                             DSDB_FLAG_NEXT_MODULE, ac->req);
1729                 if (ret == LDB_SUCCESS) {
1730                         tempstr2 = talloc_strdup(ac,
1731                                                  ldb_msg_find_attr_as_string(res->msgs[0],
1732                                                                              "sAMAccountName", NULL));
1733                 }
1734
1735
1736                 /* The "sAMAccountName" needs some additional trimming: we need
1737                  * to remove the trailing "$"s if they exist. */
1738                 if ((tempstr != NULL) && (tempstr[0] != '\0') &&
1739                     (tempstr[strlen(tempstr) - 1] == '$')) {
1740                         tempstr[strlen(tempstr) - 1] = '\0';
1741                 }
1742                 if ((tempstr2 != NULL) && (tempstr2[0] != '\0') &&
1743                     (tempstr2[strlen(tempstr2) - 1] == '$')) {
1744                         tempstr2[strlen(tempstr2) - 1] = '\0';
1745                 }
1746                 sam_accountname = tempstr;
1747                 old_sam_accountname = tempstr2;
1748         }
1749
1750         if (old_dns_hostname == NULL) {
1751                 /* we cannot change when the old name is unknown */
1752                 dns_hostname = NULL;
1753         }
1754         if ((old_dns_hostname != NULL) && (dns_hostname != NULL) &&
1755             (strcasecmp(old_dns_hostname, dns_hostname) == 0)) {
1756                 /* The "dNSHostName" didn't change */
1757                 dns_hostname = NULL;
1758         }
1759
1760         if (old_sam_accountname == NULL) {
1761                 /* we cannot change when the old name is unknown */
1762                 sam_accountname = NULL;
1763         }
1764         if ((old_sam_accountname != NULL) && (sam_accountname != NULL) &&
1765             (strcasecmp(old_sam_accountname, sam_accountname) == 0)) {
1766                 /* The "sAMAccountName" didn't change */
1767                 sam_accountname = NULL;
1768         }
1769
1770         if ((dns_hostname == NULL) && (sam_accountname == NULL)) {
1771                 /* Well, there are information missing (old name(s)) or the
1772                  * names didn't change. We've nothing to do and can exit here */
1773                 return LDB_SUCCESS;
1774         }
1775
1776         /* Potential "servicePrincipalName" changes in the same request have to
1777          * be handled before the update (Windows behaviour). */
1778         el = ldb_msg_find_element(ac->msg, "servicePrincipalName");
1779         if (el != NULL) {
1780                 msg = ldb_msg_new(ac->msg);
1781                 if (msg == NULL) {
1782                         return ldb_module_oom(ac->module);
1783                 }
1784                 msg->dn = ac->msg->dn;
1785
1786                 do {
1787                         ret = ldb_msg_add(msg, el, el->flags);
1788                         if (ret != LDB_SUCCESS) {
1789                                 return ret;
1790                         }
1791
1792                         ldb_msg_remove_element(ac->msg, el);
1793
1794                         el = ldb_msg_find_element(ac->msg,
1795                                                   "servicePrincipalName");
1796                 } while (el != NULL);
1797
1798                 ret = dsdb_module_modify(ac->module, msg,
1799                                          DSDB_FLAG_NEXT_MODULE, ac->req);
1800                 if (ret != LDB_SUCCESS) {
1801                         return ret;
1802                 }
1803                 talloc_free(msg);
1804         }
1805
1806         /* Fetch the "servicePrincipalName"s if any */
1807         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1808                                  DSDB_FLAG_NEXT_MODULE, ac->req, NULL);
1809         if (ret != LDB_SUCCESS) {
1810                 return ret;
1811         }
1812         if ((res->count != 1) || (res->msgs[0]->num_elements > 1)) {
1813                 return ldb_operr(ldb);
1814         }
1815
1816         if (res->msgs[0]->num_elements == 1) {
1817                 /* Yes, we do have "servicePrincipalName"s. First we update them
1818                  * locally, that means we do always substitute the current
1819                  * "dNSHostName" with the new one and/or "sAMAccountName"
1820                  * without "$" with the new one and then we append this to the
1821                  * modification request (Windows behaviour). */
1822
1823                 for (i = 0; i < res->msgs[0]->elements[0].num_values; i++) {
1824                         char *old_str, *new_str, *pos;
1825                         const char *tok;
1826
1827                         old_str = (char *)
1828                                 res->msgs[0]->elements[0].values[i].data;
1829
1830                         new_str = talloc_strdup(ac->msg,
1831                                                 strtok_r(old_str, "/", &pos));
1832                         if (new_str == NULL) {
1833                                 return ldb_module_oom(ac->module);
1834                         }
1835
1836                         while ((tok = strtok_r(NULL, "/", &pos)) != NULL) {
1837                                 if ((dns_hostname != NULL) &&
1838                                     (strcasecmp(tok, old_dns_hostname) == 0)) {
1839                                         tok = dns_hostname;
1840                                 }
1841                                 if ((sam_accountname != NULL) &&
1842                                     (strcasecmp(tok, old_sam_accountname) == 0)) {
1843                                         tok = sam_accountname;
1844                                 }
1845
1846                                 new_str = talloc_asprintf(ac->msg, "%s/%s",
1847                                                           new_str, tok);
1848                                 if (new_str == NULL) {
1849                                         return ldb_module_oom(ac->module);
1850                                 }
1851                         }
1852
1853                         ret = ldb_msg_add_string(ac->msg,
1854                                                  "servicePrincipalName",
1855                                                  new_str);
1856                         if (ret != LDB_SUCCESS) {
1857                                 return ret;
1858                         }
1859                 }
1860
1861                 el = ldb_msg_find_element(ac->msg, "servicePrincipalName");
1862                 el->flags = LDB_FLAG_MOD_REPLACE;
1863         }
1864
1865         talloc_free(res);
1866
1867         return LDB_SUCCESS;
1868 }
1869
1870
1871 /* add */
1872 static int samldb_add(struct ldb_module *module, struct ldb_request *req)
1873 {
1874         struct ldb_context *ldb;
1875         struct samldb_ctx *ac;
1876         int ret;
1877
1878         ldb = ldb_module_get_ctx(module);
1879         ldb_debug(ldb, LDB_DEBUG_TRACE, "samldb_add\n");
1880
1881         /* do not manipulate our control entries */
1882         if (ldb_dn_is_special(req->op.add.message->dn)) {
1883                 return ldb_next_request(module, req);
1884         }
1885
1886         ac = samldb_ctx_init(module, req);
1887         if (ac == NULL) {
1888                 return ldb_operr(ldb);
1889         }
1890
1891         /* build the new msg */
1892         ac->msg = ldb_msg_copy_shallow(ac, req->op.add.message);
1893         if (ac->msg == NULL) {
1894                 talloc_free(ac);
1895                 ldb_debug(ldb, LDB_DEBUG_FATAL,
1896                           "samldb_add: ldb_msg_copy_shallow failed!\n");
1897                 return ldb_operr(ldb);
1898         }
1899
1900         if (samdb_find_attribute(ldb, ac->msg,
1901                                  "objectclass", "user") != NULL) {
1902                 ac->type = "user";
1903
1904                 ret = samldb_prim_group_trigger(ac);
1905                 if (ret != LDB_SUCCESS) {
1906                         return ret;
1907                 }
1908
1909                 ret = samldb_objectclass_trigger(ac);
1910                 if (ret != LDB_SUCCESS) {
1911                         return ret;
1912                 }
1913
1914                 return samldb_fill_object(ac);
1915         }
1916
1917         if (samdb_find_attribute(ldb, ac->msg,
1918                                  "objectclass", "group") != NULL) {
1919                 ac->type = "group";
1920
1921                 ret = samldb_objectclass_trigger(ac);
1922                 if (ret != LDB_SUCCESS) {
1923                         return ret;
1924                 }
1925
1926                 return samldb_fill_object(ac);
1927         }
1928
1929         /* perhaps a foreignSecurityPrincipal? */
1930         if (samdb_find_attribute(ldb, ac->msg,
1931                                  "objectclass",
1932                                  "foreignSecurityPrincipal") != NULL) {
1933                 return samldb_fill_foreignSecurityPrincipal_object(ac);
1934         }
1935
1936         if (samdb_find_attribute(ldb, ac->msg,
1937                                  "objectclass", "classSchema") != NULL) {
1938                 ret = samldb_schema_info_update(ac);
1939                 if (ret != LDB_SUCCESS) {
1940                         talloc_free(ac);
1941                         return ret;
1942                 }
1943
1944                 ac->type = "classSchema";
1945                 return samldb_fill_object(ac);
1946         }
1947
1948         if (samdb_find_attribute(ldb, ac->msg,
1949                                  "objectclass", "attributeSchema") != NULL) {
1950                 ret = samldb_schema_info_update(ac);
1951                 if (ret != LDB_SUCCESS) {
1952                         talloc_free(ac);
1953                         return ret;
1954                 }
1955
1956                 ac->type = "attributeSchema";
1957                 return samldb_fill_object(ac);
1958         }
1959
1960         talloc_free(ac);
1961
1962         /* nothing matched, go on */
1963         return ldb_next_request(module, req);
1964 }
1965
1966 /* modify */
1967 static int samldb_modify(struct ldb_module *module, struct ldb_request *req)
1968 {
1969         struct ldb_context *ldb;
1970         struct samldb_ctx *ac;
1971         struct ldb_message_element *el, *el2;
1972         bool modified = false;
1973         int ret;
1974
1975         if (ldb_dn_is_special(req->op.mod.message->dn)) {
1976                 /* do not manipulate our control entries */
1977                 return ldb_next_request(module, req);
1978         }
1979
1980         ldb = ldb_module_get_ctx(module);
1981
1982         /* make sure that "objectSid" is not specified */
1983         el = ldb_msg_find_element(req->op.mod.message, "objectSid");
1984         if (el != NULL) {
1985                 ldb_set_errstring(ldb,
1986                                   "samldb: objectSid must not be specified!");
1987                 return LDB_ERR_UNWILLING_TO_PERFORM;
1988         }
1989         /* make sure that "sAMAccountType" is not specified */
1990         el = ldb_msg_find_element(req->op.mod.message, "sAMAccountType");
1991         if (el != NULL) {
1992                 ldb_set_errstring(ldb,
1993                                   "samldb: sAMAccountType must not be specified!");
1994                 return LDB_ERR_UNWILLING_TO_PERFORM;
1995         }
1996         /* make sure that "isCriticalSystemObject" is not specified */
1997         el = ldb_msg_find_element(req->op.mod.message, "isCriticalSystemObject");
1998         if (el != NULL) {
1999                 if (ldb_request_get_control(req, LDB_CONTROL_RELAX_OID) == NULL) {
2000                         ldb_set_errstring(ldb,
2001                                           "samldb: isCriticalSystemObject must not be specified!");
2002                         return LDB_ERR_UNWILLING_TO_PERFORM;
2003                 }
2004         }
2005
2006         /* msDS-IntId is not allowed to be modified
2007          * except when modification comes from replication */
2008         if (ldb_msg_find_element(req->op.mod.message, "msDS-IntId")) {
2009                 if (!ldb_request_get_control(req,
2010                                              DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
2011                         return LDB_ERR_CONSTRAINT_VIOLATION;
2012                 }
2013         }
2014
2015         ac = samldb_ctx_init(module, req);
2016         if (ac == NULL) {
2017                 return ldb_operr(ldb);
2018         }
2019
2020         /* build the new msg */
2021         ac->msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2022         if (ac->msg == NULL) {
2023                 talloc_free(ac);
2024                 ldb_debug(ldb, LDB_DEBUG_FATAL,
2025                           "samldb_modify: ldb_msg_copy_shallow failed!\n");
2026                 return ldb_operr(ldb);
2027         }
2028
2029         el = ldb_msg_find_element(ac->msg, "primaryGroupID");
2030         if (el != NULL) {
2031                 ret = samldb_prim_group_change(ac);
2032                 if (ret != LDB_SUCCESS) {
2033                         return ret;
2034                 }
2035         }
2036
2037         el = ldb_msg_find_element(ac->msg, "userAccountControl");
2038         if (el != NULL) {
2039                 modified = true;
2040                 ret = samldb_user_account_control_change(ac);
2041                 if (ret != LDB_SUCCESS) {
2042                         return ret;
2043                 }
2044         }
2045
2046         el = ldb_msg_find_element(ac->msg, "groupType");
2047         if (el != NULL) {
2048                 modified = true;
2049                 ret = samldb_group_type_change(ac);
2050                 if (ret != LDB_SUCCESS) {
2051                         return ret;
2052                 }
2053         }
2054
2055         el = ldb_msg_find_element(ac->msg, "sAMAccountName");
2056         if (el != NULL) {
2057                 ret = samldb_sam_accountname_check(ac);
2058                 if (ret != LDB_SUCCESS) {
2059                         return ret;
2060                 }
2061         }
2062
2063         el = ldb_msg_find_element(ac->msg, "member");
2064         if (el != NULL) {
2065                 ret = samldb_member_check(ac);
2066                 if (ret != LDB_SUCCESS) {
2067                         return ret;
2068                 }
2069         }
2070
2071         el = ldb_msg_find_element(ac->msg, "description");
2072         if (el != NULL) {
2073                 ret = samldb_description_check(ac, &modified);
2074                 if (ret != LDB_SUCCESS) {
2075                         return ret;
2076                 }
2077         }
2078
2079         el = ldb_msg_find_element(ac->msg, "dNSHostName");
2080         el2 = ldb_msg_find_element(ac->msg, "sAMAccountName");
2081         if ((el != NULL) || (el2 != NULL)) {
2082                 modified = true;
2083                 ret = samldb_service_principal_names_change(ac);
2084                 if (ret != LDB_SUCCESS) {
2085                         return ret;
2086                 }
2087         }
2088
2089         if (modified) {
2090                 struct ldb_request *child_req;
2091
2092                 /* Now perform the real modifications as a child request */
2093                 ret = ldb_build_mod_req(&child_req, ldb, ac,
2094                                         ac->msg,
2095                                         req->controls,
2096                                         req, dsdb_next_callback,
2097                                         req);
2098                 LDB_REQ_SET_LOCATION(child_req);
2099                 if (ret != LDB_SUCCESS) {
2100                         return ret;
2101                 }
2102
2103                 return ldb_next_request(module, child_req);
2104         }
2105
2106         talloc_free(ac);
2107
2108         /* no change which interests us, go on */
2109         return ldb_next_request(module, req);
2110 }
2111
2112 /* delete */
2113
2114 static int samldb_prim_group_users_check(struct samldb_ctx *ac)
2115 {
2116         struct ldb_context *ldb;
2117         struct dom_sid *sid;
2118         uint32_t rid;
2119         NTSTATUS status;
2120         int ret;
2121         struct ldb_result *res;
2122         const char *attrs[] = { "objectSid", NULL };
2123         const char *noattrs[] = { NULL };
2124
2125         ldb = ldb_module_get_ctx(ac->module);
2126
2127         /* Finds out the SID/RID of the SAM object */
2128         ret = dsdb_module_search_dn(ac->module, ac, &res, ac->req->op.del.dn, attrs, DSDB_FLAG_NEXT_MODULE, ac->req);
2129         if (ret != LDB_SUCCESS) {
2130                 return ret;
2131         }
2132
2133         sid = samdb_result_dom_sid(ac, res->msgs[0], "objectSid");
2134         if (sid == NULL) {
2135                 /* No SID - it might not be a SAM object - therefore ok */
2136                 return LDB_SUCCESS;
2137         }
2138         status = dom_sid_split_rid(ac, sid, NULL, &rid);
2139         if (!NT_STATUS_IS_OK(status)) {
2140                 return ldb_operr(ldb);
2141         }
2142         if (rid == 0) {
2143                 /* Special object (security principal?) */
2144                 return LDB_SUCCESS;
2145         }
2146
2147         /* Deny delete requests from groups which are primary ones */
2148         ret = dsdb_module_search(ac->module, ac, &res, NULL, LDB_SCOPE_SUBTREE, noattrs,
2149                                  DSDB_FLAG_NEXT_MODULE,
2150                                  ac->req,
2151                                  "(&(primaryGroupID=%u)(objectClass=user))", rid);
2152         if (ret != LDB_SUCCESS) {
2153                 return ret;
2154         }
2155         if (res->count > 0) {
2156                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
2157         }
2158
2159         return LDB_SUCCESS;
2160 }
2161
2162 static int samldb_delete(struct ldb_module *module, struct ldb_request *req)
2163 {
2164         struct samldb_ctx *ac;
2165         int ret;
2166
2167         if (ldb_dn_is_special(req->op.del.dn)) {
2168                 /* do not manipulate our control entries */
2169                 return ldb_next_request(module, req);
2170         }
2171
2172         ac = samldb_ctx_init(module, req);
2173         if (ac == NULL) {
2174                 return ldb_operr(ldb_module_get_ctx(module));
2175         }
2176
2177         ret = samldb_prim_group_users_check(ac);
2178         if (ret != LDB_SUCCESS) {
2179                 return ret;
2180         }
2181
2182         talloc_free(ac);
2183
2184         return ldb_next_request(module, req);
2185 }
2186
2187 /* extended */
2188
2189 static int samldb_extended_allocate_rid_pool(struct ldb_module *module, struct ldb_request *req)
2190 {
2191         struct ldb_context *ldb = ldb_module_get_ctx(module);
2192         struct dsdb_fsmo_extended_op *exop;
2193         int ret;
2194
2195         exop = talloc_get_type(req->op.extended.data,
2196                                struct dsdb_fsmo_extended_op);
2197         if (!exop) {
2198                 ldb_set_errstring(ldb,
2199                                   "samldb_extended_allocate_rid_pool: invalid extended data");
2200                 return LDB_ERR_PROTOCOL_ERROR;
2201         }
2202
2203         ret = ridalloc_allocate_rid_pool_fsmo(module, exop, req);
2204         if (ret != LDB_SUCCESS) {
2205                 return ret;
2206         }
2207
2208         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2209 }
2210
2211 static int samldb_extended(struct ldb_module *module, struct ldb_request *req)
2212 {
2213         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_ALLOCATE_RID_POOL) == 0) {
2214                 return samldb_extended_allocate_rid_pool(module, req);
2215         }
2216
2217         return ldb_next_request(module, req);
2218 }
2219
2220
2221 static const struct ldb_module_ops ldb_samldb_module_ops = {
2222         .name          = "samldb",
2223         .add           = samldb_add,
2224         .modify        = samldb_modify,
2225         .del           = samldb_delete,
2226         .extended      = samldb_extended
2227 };
2228
2229
2230 int ldb_samldb_module_init(const char *version)
2231 {
2232         LDB_MODULE_CHECK_VERSION(version);
2233         return ldb_register_module(&ldb_samldb_module_ops);
2234 }