source4/dsdb/samdb/ldb_modules/samldb.c

   1 /*
   2    SAM ldb module
   3
   4    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   5    Copyright (C) Simo Sorce  2004-2008
   6    Copyright (C) Matthias Dieter Wallnöfer 2009-2011
   7
   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                         /* Workstation and (read-only) DC objects do need objectclass "computer" */
 901                         if ((samdb_find_attribute(ldb, ac->msg,
 902                                                   "objectclass", "computer") == NULL) &&
 903                             (user_account_control &
 904                              (UF_SERVER_TRUST_ACCOUNT | UF_WORKSTATION_TRUST_ACCOUNT))) {
 905                                 ldb_set_errstring(ldb,
 906                                                   "samldb: Requested account type does need objectclass 'computer'!");
 907                                 return LDB_ERR_OBJECT_CLASS_VIOLATION;
 908                         }
 909
 910                         account_type = ds_uf2atype(user_account_control);
 911                         if (account_type == 0) {
 912                                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
 913                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 914                         }
 915                         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
 916                                                  "sAMAccountType",
 917                                                  account_type);
 918                         if (ret != LDB_SUCCESS) {
 919                                 return ret;
 920                         }
 921                         el2 = ldb_msg_find_element(ac->msg, "sAMAccountType");
 922                         el2->flags = LDB_FLAG_MOD_REPLACE;
 923
 924                         /* "isCriticalSystemObject" might be set */
 925                         if (user_account_control &
 926                             (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
 927                                 ret = ldb_msg_add_string(ac->msg, "isCriticalSystemObject",
 928                                                          "TRUE");
 929                                 if (ret != LDB_SUCCESS) {
 930                                         return ret;
 931                                 }
 932                                 el2 = ldb_msg_find_element(ac->msg,
 933                                                            "isCriticalSystemObject");
 934                                 el2->flags = LDB_FLAG_MOD_REPLACE;
 935                         } else if (user_account_control & UF_WORKSTATION_TRUST_ACCOUNT) {
 936                                 ret = ldb_msg_add_string(ac->msg, "isCriticalSystemObject",
 937                                                          "FALSE");
 938                                 if (ret != LDB_SUCCESS) {
 939                                         return ret;
 940                                 }
 941                                 el2 = ldb_msg_find_element(ac->msg,
 942                                                            "isCriticalSystemObject");
 943                                 el2->flags = LDB_FLAG_MOD_REPLACE;
 944                         }
 945
 946                         /* Step 1.4: "userAccountControl" -> "primaryGroupID" mapping */
 947                         if (!ldb_msg_find_element(ac->msg, "primaryGroupID")) {
 948                                 uint32_t rid = ds_uf2prim_group_rid(user_account_control);
 949                                 ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
 950                                                          "primaryGroupID", rid);
 951                                 if (ret != LDB_SUCCESS) {
 952                                         return ret;
 953                                 }
 954                                 el2 = ldb_msg_find_element(ac->msg,
 955                                                            "primaryGroupID");
 956                                 el2->flags = LDB_FLAG_MOD_REPLACE;
 957                         }
 958
 959                         /* Step 1.5: Add additional flags when needed */
 960                         /* Obviously this is done when the "userAccountControl"
 961                          * has been generated here (tested against Windows
 962                          * Server) */
 963                         if (uac_generated) {
 964                                 user_account_control |= UF_ACCOUNTDISABLE;
 965                                 user_account_control |= UF_PASSWD_NOTREQD;
 966
 967                                 ret = samdb_msg_set_uint(ldb, ac->msg, ac->msg,
 968                                                          "userAccountControl",
 969                                                          user_account_control);
 970                                 if (ret != LDB_SUCCESS) {
 971                                         return ret;
 972                                 }
 973                         }
 974                 }
 975
 976         } else if (strcmp(ac->type, "group") == 0) {
 977                 const char *tempstr;
 978
 979                 /* Step 2.2: Default values */
 980                 tempstr = talloc_asprintf(ac->msg, "%d",
 981                                           GTYPE_SECURITY_GLOBAL_GROUP);
 982                 if (tempstr == NULL) return ldb_operr(ldb);
 983                 ret = samdb_find_or_add_attribute(ldb, ac->msg,
 984                         "groupType", tempstr);
 985                 if (ret != LDB_SUCCESS) return ret;
 986
 987                 /* Step 2.3: "groupType" -> "sAMAccountType" */
 988                 el = ldb_msg_find_element(ac->msg, "groupType");
 989                 if (el != NULL) {
 990                         uint32_t group_type, account_type;
 991
 992                         group_type = ldb_msg_find_attr_as_uint(ac->msg,
 993                                                                "groupType", 0);
 994
 995                         /* The creation of builtin groups requires the
 996                          * RELAX control */
 997                         if (group_type == GTYPE_SECURITY_BUILTIN_LOCAL_GROUP) {
 998                                 if (ldb_request_get_control(ac->req,
 999                                                             LDB_CONTROL_RELAX_OID) == NULL) {
1000                                         return LDB_ERR_UNWILLING_TO_PERFORM;
1001                                 }
1002                         }
1003
1004                         account_type = ds_gtype2atype(group_type);
1005                         if (account_type == 0) {
1006                                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
1007                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1008                         }
1009                         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
1010                                                  "sAMAccountType",
1011                                                  account_type);
1012                         if (ret != LDB_SUCCESS) {
1013                                 return ret;
1014                         }
1015                         el2 = ldb_msg_find_element(ac->msg, "sAMAccountType");
1016                         el2->flags = LDB_FLAG_MOD_REPLACE;
1017                 }
1018         }
1019
1020         return LDB_SUCCESS;
1021 }
1022
1023 /*
1024  * "Primary group ID" trigger (MS-SAMR 3.1.1.8.2)
1025  *
1026  * Has to be invoked on "add" and "modify" operations on "user" and "computer"
1027  * objects.
1028  * ac->msg contains the "add"/"modify" message
1029  */
1030
1031 static int samldb_prim_group_set(struct samldb_ctx *ac)
1032 {
1033         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1034         uint32_t rid;
1035         struct dom_sid *sid;
1036         struct ldb_result *res;
1037         int ret;
1038         const char *noattrs[] = { NULL };
1039
1040         rid = ldb_msg_find_attr_as_uint(ac->msg, "primaryGroupID", (uint32_t) -1);
1041         if (rid == (uint32_t) -1) {
1042                 /* we aren't affected of any primary group set */
1043                 return LDB_SUCCESS;
1044
1045         } else if (!ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
1046                 ldb_set_errstring(ldb,
1047                                   "The primary group isn't settable on add operations!");
1048                 return LDB_ERR_UNWILLING_TO_PERFORM;
1049         }
1050
1051         sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), rid);
1052         if (sid == NULL) {
1053                 return ldb_operr(ldb);
1054         }
1055
1056         ret = dsdb_module_search(ac->module, ac, &res, NULL, LDB_SCOPE_SUBTREE,
1057                                  noattrs, DSDB_FLAG_NEXT_MODULE,
1058                                  ac->req,
1059                                  "(objectSid=%s)",
1060                                  ldap_encode_ndr_dom_sid(ac, sid));
1061         if (ret != LDB_SUCCESS) {
1062                 return ret;
1063         }
1064         if (res->count != 1) {
1065                 talloc_free(res);
1066                 ldb_asprintf_errstring(ldb,
1067                                        "Failed to find primary group with RID %u!",
1068                                        rid);
1069                 return LDB_ERR_UNWILLING_TO_PERFORM;
1070         }
1071         talloc_free(res);
1072
1073         return LDB_SUCCESS;
1074 }
1075
1076 static int samldb_prim_group_change(struct samldb_ctx *ac)
1077 {
1078         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1079         const char * attrs[] = { "primaryGroupID", "memberOf", NULL };
1080         struct ldb_result *res, *group_res;
1081         struct ldb_message_element *el;
1082         struct ldb_message *msg;
1083         uint32_t prev_rid, new_rid;
1084         struct dom_sid *prev_sid, *new_sid;
1085         struct ldb_dn *prev_prim_group_dn, *new_prim_group_dn;
1086         int ret;
1087         const char *noattrs[] = { NULL };
1088
1089         el = dsdb_get_single_valued_attr(ac->msg, "primaryGroupID",
1090                                          ac->req->operation);
1091         if (el == NULL) {
1092                 /* we are not affected */
1093                 return LDB_SUCCESS;
1094         }
1095
1096         /* Fetch information from the existing object */
1097
1098         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1099                                  DSDB_FLAG_NEXT_MODULE, ac->req, NULL);
1100         if (ret != LDB_SUCCESS) {
1101                 return ret;
1102         }
1103         if (res->count != 1) {
1104                 return ldb_operr(ldb);
1105         }
1106
1107         /* Finds out the DN of the old primary group */
1108
1109         prev_rid = ldb_msg_find_attr_as_uint(res->msgs[0], "primaryGroupID",
1110                                              (uint32_t) -1);
1111         if (prev_rid == (uint32_t) -1) {
1112                 /* User objects do always have a mandatory "primaryGroupID"
1113                  * attribute. If this doesn't exist then the object is of the
1114                  * wrong type. This is the exact Windows error code */
1115                 return LDB_ERR_OBJECT_CLASS_VIOLATION;
1116         }
1117
1118         prev_sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), prev_rid);
1119         if (prev_sid == NULL) {
1120                 return ldb_operr(ldb);
1121         }
1122
1123         /* Finds out the DN of the new primary group
1124          * Notice: in order to parse the primary group ID correctly we create
1125          * a temporary message here. */
1126
1127         msg = ldb_msg_new(ac->msg);
1128         if (msg == NULL) {
1129                 return ldb_module_oom(ac->module);
1130         }
1131         ret = ldb_msg_add(msg, el, 0);
1132         if (ret != LDB_SUCCESS) {
1133                 return ret;
1134         }
1135         new_rid = ldb_msg_find_attr_as_uint(msg, "primaryGroupID", (uint32_t) -1);
1136         talloc_free(msg);
1137         if (new_rid == (uint32_t) -1) {
1138                 /* we aren't affected of any primary group change */
1139                 return LDB_SUCCESS;
1140         }
1141
1142         if (prev_rid == new_rid) {
1143                 return LDB_SUCCESS;
1144         }
1145
1146         ret = dsdb_module_search(ac->module, ac, &group_res, NULL, LDB_SCOPE_SUBTREE,
1147                                  noattrs, DSDB_FLAG_NEXT_MODULE,
1148                                  ac->req,
1149                                  "(objectSid=%s)",
1150                                  ldap_encode_ndr_dom_sid(ac, prev_sid));
1151         if (ret != LDB_SUCCESS) {
1152                 return ret;
1153         }
1154         if (group_res->count != 1) {
1155                 return ldb_operr(ldb);
1156         }
1157         prev_prim_group_dn = group_res->msgs[0]->dn;
1158
1159         new_sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), new_rid);
1160         if (new_sid == NULL) {
1161                 return ldb_operr(ldb);
1162         }
1163
1164         ret = dsdb_module_search(ac->module, ac, &group_res, NULL, LDB_SCOPE_SUBTREE,
1165                                  noattrs, DSDB_FLAG_NEXT_MODULE,
1166                                  ac->req,
1167                                  "(objectSid=%s)",
1168                                  ldap_encode_ndr_dom_sid(ac, new_sid));
1169         if (ret != LDB_SUCCESS) {
1170                 return ret;
1171         }
1172         if (group_res->count != 1) {
1173                 /* Here we know if the specified new primary group candidate is
1174                  * valid or not. */
1175                 return LDB_ERR_UNWILLING_TO_PERFORM;
1176         }
1177         new_prim_group_dn = group_res->msgs[0]->dn;
1178
1179         /* We need to be already a normal member of the new primary
1180          * group in order to be successful. */
1181         el = samdb_find_attribute(ldb, res->msgs[0], "memberOf",
1182                                   ldb_dn_get_linearized(new_prim_group_dn));
1183         if (el == NULL) {
1184                 return LDB_ERR_UNWILLING_TO_PERFORM;
1185         }
1186
1187         /* Remove the "member" attribute on the new primary group */
1188         msg = ldb_msg_new(ac->msg);
1189         if (msg == NULL) {
1190                 return ldb_module_oom(ac->module);
1191         }
1192         msg->dn = new_prim_group_dn;
1193
1194         ret = samdb_msg_add_delval(ldb, msg, msg, "member",
1195                                    ldb_dn_get_linearized(ac->msg->dn));
1196         if (ret != LDB_SUCCESS) {
1197                 return ret;
1198         }
1199
1200         ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE, ac->req);
1201         if (ret != LDB_SUCCESS) {
1202                 return ret;
1203         }
1204         talloc_free(msg);
1205
1206         /* Add a "member" attribute for the previous primary group */
1207         msg = ldb_msg_new(ac->msg);
1208         if (msg == NULL) {
1209                 return ldb_module_oom(ac->module);
1210         }
1211         msg->dn = prev_prim_group_dn;
1212
1213         ret = samdb_msg_add_addval(ldb, msg, msg, "member",
1214                                    ldb_dn_get_linearized(ac->msg->dn));
1215         if (ret != LDB_SUCCESS) {
1216                 return ret;
1217         }
1218
1219         ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE, ac->req);
1220         if (ret != LDB_SUCCESS) {
1221                 return ret;
1222         }
1223         talloc_free(msg);
1224
1225         return LDB_SUCCESS;
1226 }
1227
1228 static int samldb_prim_group_trigger(struct samldb_ctx *ac)
1229 {
1230         int ret;
1231
1232         if (ac->req->operation == LDB_ADD) {
1233                 ret = samldb_prim_group_set(ac);
1234         } else {
1235                 ret = samldb_prim_group_change(ac);
1236         }
1237
1238         return ret;
1239 }
1240
1241
1242 /**
1243  * This function is called on LDB modify operations. It performs some additions/
1244  * replaces on the current LDB message when "userAccountControl" changes.
1245  */
1246 static int samldb_user_account_control_change(struct samldb_ctx *ac)
1247 {
1248         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1249         uint32_t user_account_control, old_user_account_control, account_type;
1250         struct ldb_message_element *el;
1251         struct ldb_message *tmp_msg;
1252         int ret;
1253         struct ldb_result *res;
1254         const char *attrs[] = { "userAccountControl", "objectClass", NULL };
1255         unsigned int i;
1256         bool is_computer = false;
1257
1258         el = dsdb_get_single_valued_attr(ac->msg, "userAccountControl",
1259                                          ac->req->operation);
1260         if (el == NULL) {
1261                 /* we are not affected */
1262                 return LDB_SUCCESS;
1263         }
1264
1265         /* Create a temporary message for fetching the "userAccountControl" */
1266         tmp_msg = ldb_msg_new(ac->msg);
1267         if (tmp_msg == NULL) {
1268                 return ldb_module_oom(ac->module);
1269         }
1270         ret = ldb_msg_add(tmp_msg, el, 0);
1271         if (ret != LDB_SUCCESS) {
1272                 return ret;
1273         }
1274         user_account_control = ldb_msg_find_attr_as_uint(tmp_msg,
1275                                                          "userAccountControl",
1276                                                          0);
1277         talloc_free(tmp_msg);
1278
1279         /* Temporary duplicate accounts aren't allowed */
1280         if ((user_account_control & UF_TEMP_DUPLICATE_ACCOUNT) != 0) {
1281                 return LDB_ERR_OTHER;
1282         }
1283
1284         /* Fetch the old "userAccountControl" and "objectClass" */
1285         ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, attrs,
1286                                     DSDB_FLAG_NEXT_MODULE, ac->req);
1287         if (ret != LDB_SUCCESS) {
1288                 return ret;
1289         }
1290         old_user_account_control = ldb_msg_find_attr_as_uint(res->msgs[0], "userAccountControl", 0);
1291         if (old_user_account_control == 0) {
1292                 return ldb_operr(ldb);
1293         }
1294         el = ldb_msg_find_element(res->msgs[0], "objectClass");
1295         if (el == NULL) {
1296                 return ldb_operr(ldb);
1297         }
1298
1299         /* When we do not have objectclass "computer" we cannot switch to a (read-only) DC */
1300         for (i = 0; i < el->num_values; i++) {
1301                 if (ldb_attr_cmp((char *)el->values[i].data, "computer") == 0) {
1302                         is_computer = true;
1303                         break;
1304                 }
1305         }
1306         if (!is_computer &&
1307             (user_account_control & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT))) {
1308                 ldb_set_errstring(ldb,
1309                                   "samldb: Requested account type does need objectclass 'computer'!");
1310                 return LDB_ERR_UNWILLING_TO_PERFORM;
1311         }
1312
1313         /*
1314          * The functions "ds_uf2atype" and "ds_uf2prim_group_rid" are used as
1315          * detectors for account type changes.
1316          * So if the account type does change then we need to adjust the
1317          * "sAMAccountType", the "isCriticalSystemObject" and the
1318          * "primaryGroupID" attribute.
1319          */
1320         if ((ds_uf2atype(user_account_control)
1321              == ds_uf2atype(old_user_account_control)) &&
1322             (ds_uf2prim_group_rid(user_account_control)
1323              == ds_uf2prim_group_rid(old_user_account_control))) {
1324                 return LDB_SUCCESS;
1325         }
1326
1327         account_type = ds_uf2atype(user_account_control);
1328         if (account_type == 0) {
1329                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
1330                 return LDB_ERR_UNWILLING_TO_PERFORM;
1331         }
1332         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "sAMAccountType",
1333                                  account_type);
1334         if (ret != LDB_SUCCESS) {
1335                 return ret;
1336         }
1337         el = ldb_msg_find_element(ac->msg, "sAMAccountType");
1338         el->flags = LDB_FLAG_MOD_REPLACE;
1339
1340         /* "isCriticalSystemObject" might be set/changed */
1341         if (user_account_control
1342             & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
1343                 ret = ldb_msg_add_string(ac->msg, "isCriticalSystemObject",
1344                                          "TRUE");
1345                 if (ret != LDB_SUCCESS) {
1346                         return ret;
1347                 }
1348                 el = ldb_msg_find_element(ac->msg,
1349                                            "isCriticalSystemObject");
1350                 el->flags = LDB_FLAG_MOD_REPLACE;
1351         } else if (user_account_control & UF_WORKSTATION_TRUST_ACCOUNT) {
1352                 ret = ldb_msg_add_string(ac->msg, "isCriticalSystemObject",
1353                                          "FALSE");
1354                 if (ret != LDB_SUCCESS) {
1355                         return ret;
1356                 }
1357                 el = ldb_msg_find_element(ac->msg,
1358                                            "isCriticalSystemObject");
1359                 el->flags = LDB_FLAG_MOD_REPLACE;
1360         }
1361
1362         if (!ldb_msg_find_element(ac->msg, "primaryGroupID")) {
1363                 uint32_t rid = ds_uf2prim_group_rid(user_account_control);
1364                 ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg,
1365                                          "primaryGroupID", rid);
1366                 if (ret != LDB_SUCCESS) {
1367                         return ret;
1368                 }
1369                 el = ldb_msg_find_element(ac->msg,
1370                                            "primaryGroupID");
1371                 el->flags = LDB_FLAG_MOD_REPLACE;
1372         }
1373
1374         return LDB_SUCCESS;
1375 }
1376
1377 static int samldb_group_type_change(struct samldb_ctx *ac)
1378 {
1379         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1380         uint32_t group_type, old_group_type, account_type;
1381         struct ldb_message_element *el;
1382         struct ldb_message *tmp_msg;
1383         int ret;
1384         struct ldb_result *res;
1385         const char *attrs[] = { "groupType", NULL };
1386
1387         el = dsdb_get_single_valued_attr(ac->msg, "groupType",
1388                                          ac->req->operation);
1389         if (el == NULL) {
1390                 /* we are not affected */
1391                 return LDB_SUCCESS;
1392         }
1393
1394         /* Create a temporary message for fetching the "groupType" */
1395         tmp_msg = ldb_msg_new(ac->msg);
1396         if (tmp_msg == NULL) {
1397                 return ldb_module_oom(ac->module);
1398         }
1399         ret = ldb_msg_add(tmp_msg, el, 0);
1400         if (ret != LDB_SUCCESS) {
1401                 return ret;
1402         }
1403         group_type = ldb_msg_find_attr_as_uint(tmp_msg, "groupType", 0);
1404         talloc_free(tmp_msg);
1405
1406         ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, attrs,
1407                                     DSDB_FLAG_NEXT_MODULE, ac->req);
1408         if (ret != LDB_SUCCESS) {
1409                 return ret;
1410         }
1411         old_group_type = ldb_msg_find_attr_as_uint(res->msgs[0], "groupType", 0);
1412         if (old_group_type == 0) {
1413                 return ldb_operr(ldb);
1414         }
1415
1416         /* Group type switching isn't so easy as it seems: We can only
1417          * change in this directions: global <-> universal <-> local
1418          * On each step also the group type itself
1419          * (security/distribution) is variable. */
1420
1421         if (ldb_request_get_control(ac->req, LDB_CONTROL_PROVISION_OID) == NULL) {
1422                 switch (group_type) {
1423                 case GTYPE_SECURITY_GLOBAL_GROUP:
1424                 case GTYPE_DISTRIBUTION_GLOBAL_GROUP:
1425                         /* change to "universal" allowed */
1426                         if ((old_group_type == GTYPE_SECURITY_DOMAIN_LOCAL_GROUP) ||
1427                         (old_group_type == GTYPE_DISTRIBUTION_DOMAIN_LOCAL_GROUP)) {
1428                                 ldb_set_errstring(ldb,
1429                                         "samldb: Change from security/distribution local group forbidden!");
1430                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1431                         }
1432                 break;
1433
1434                 case GTYPE_SECURITY_UNIVERSAL_GROUP:
1435                 case GTYPE_DISTRIBUTION_UNIVERSAL_GROUP:
1436                         /* each change allowed */
1437                 break;
1438                 case GTYPE_SECURITY_DOMAIN_LOCAL_GROUP:
1439                 case GTYPE_DISTRIBUTION_DOMAIN_LOCAL_GROUP:
1440                         /* change to "universal" allowed */
1441                         if ((old_group_type == GTYPE_SECURITY_GLOBAL_GROUP) ||
1442                         (old_group_type == GTYPE_DISTRIBUTION_GLOBAL_GROUP)) {
1443                                 ldb_set_errstring(ldb,
1444                                         "samldb: Change from security/distribution global group forbidden!");
1445                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1446                         }
1447                 break;
1448
1449                 case GTYPE_SECURITY_BUILTIN_LOCAL_GROUP:
1450                 default:
1451                         /* we don't allow this "groupType" values */
1452                         return LDB_ERR_UNWILLING_TO_PERFORM;
1453                 break;
1454                 }
1455         }
1456
1457         account_type =  ds_gtype2atype(group_type);
1458         if (account_type == 0) {
1459                 ldb_set_errstring(ldb, "samldb: Unrecognized account type!");
1460                 return LDB_ERR_UNWILLING_TO_PERFORM;
1461         }
1462         ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "sAMAccountType",
1463                                  account_type);
1464         if (ret != LDB_SUCCESS) {
1465                 return ret;
1466         }
1467         el = ldb_msg_find_element(ac->msg, "sAMAccountType");
1468         el->flags = LDB_FLAG_MOD_REPLACE;
1469
1470         return LDB_SUCCESS;
1471 }
1472
1473 static int samldb_sam_accountname_check(struct samldb_ctx *ac)
1474 {
1475         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1476         const char *no_attrs[] = { NULL };
1477         struct ldb_result *res;
1478         const char *sam_accountname, *enc_str;
1479         struct ldb_message_element *el;
1480         struct ldb_message *tmp_msg;
1481         int ret;
1482
1483         el = dsdb_get_single_valued_attr(ac->msg, "sAMAccountName",
1484                                          ac->req->operation);
1485         if (el == NULL) {
1486                 /* we are not affected */
1487                 return LDB_SUCCESS;
1488         }
1489
1490         /* Create a temporary message for fetching the "sAMAccountName" */
1491         tmp_msg = ldb_msg_new(ac->msg);
1492         if (tmp_msg == NULL) {
1493                 return ldb_module_oom(ac->module);
1494         }
1495         ret = ldb_msg_add(tmp_msg, el, 0);
1496         if (ret != LDB_SUCCESS) {
1497                 return ret;
1498         }
1499         sam_accountname = talloc_steal(ac,
1500                                        ldb_msg_find_attr_as_string(tmp_msg, "sAMAccountName", NULL));
1501         talloc_free(tmp_msg);
1502
1503         if (sam_accountname == NULL) {
1504                 /* The "sAMAccountName" cannot be nothing */
1505                 ldb_set_errstring(ldb,
1506                                   "samldb: Empty account names aren't allowed!");
1507                 return LDB_ERR_UNWILLING_TO_PERFORM;
1508         }
1509
1510         enc_str = ldb_binary_encode_string(ac, sam_accountname);
1511         if (enc_str == NULL) {
1512                 return ldb_module_oom(ac->module);
1513         }
1514
1515         /* Make sure that a "sAMAccountName" is only used once */
1516
1517         ret = dsdb_module_search(ac->module, ac, &res, NULL, LDB_SCOPE_SUBTREE, no_attrs,
1518                                  DSDB_FLAG_NEXT_MODULE, ac->req,
1519                                  "(sAMAccountName=%s)", enc_str);
1520         if (ret != LDB_SUCCESS) {
1521                 return ret;
1522         }
1523         if (res->count > 1) {
1524                 return ldb_operr(ldb);
1525         } else if (res->count == 1) {
1526                 if (ldb_dn_compare(res->msgs[0]->dn, ac->msg->dn) != 0) {
1527                         ldb_asprintf_errstring(ldb,
1528                                                "samldb: Account name (sAMAccountName) '%s' already in use!",
1529                                                sam_accountname);
1530                         return LDB_ERR_ENTRY_ALREADY_EXISTS;
1531                 }
1532         }
1533         talloc_free(res);
1534
1535         return LDB_SUCCESS;
1536 }
1537
1538 static int samldb_member_check(struct samldb_ctx *ac)
1539 {
1540         static const char * const attrs[] = { "objectSid", "member", NULL };
1541         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1542         struct ldb_message_element *el;
1543         struct ldb_dn *member_dn;
1544         struct dom_sid *sid;
1545         struct ldb_result *res;
1546         struct dom_sid *group_sid;
1547         unsigned int i, j;
1548         int cnt;
1549         int ret;
1550
1551         /* Fetch information from the existing object */
1552
1553         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1554                                  DSDB_FLAG_NEXT_MODULE, ac->req, NULL);
1555         if (ret != LDB_SUCCESS) {
1556                 return ret;
1557         }
1558         if (res->count != 1) {
1559                 return ldb_operr(ldb);
1560         }
1561
1562         group_sid = samdb_result_dom_sid(res, res->msgs[0], "objectSid");
1563         if (group_sid == NULL) {
1564                 return ldb_operr(ldb);
1565         }
1566
1567         /* We've to walk over all modification entries and consider the "member"
1568          * ones. */
1569         for (i = 0; i < ac->msg->num_elements; i++) {
1570                 if (ldb_attr_cmp(ac->msg->elements[i].name, "member") != 0) {
1571                         continue;
1572                 }
1573
1574                 el = &ac->msg->elements[i];
1575                 for (j = 0; j < el->num_values; j++) {
1576                         struct ldb_message_element *mo;
1577                         struct ldb_result *group_res;
1578                         const char *group_attrs[] = { "primaryGroupID" , NULL };
1579                         uint32_t prim_group_rid;
1580
1581                         member_dn = ldb_dn_from_ldb_val(ac, ldb,
1582                                                         &el->values[j]);
1583                         if (!ldb_dn_validate(member_dn)) {
1584                                 return ldb_operr(ldb);
1585                         }
1586
1587                         /* The "member" attribute can be modified with the
1588                          * following restrictions (beside a valid DN):
1589                          *
1590                          * - "add" operations can only be performed when the
1591                          *   member still doesn't exist - if not then return
1592                          *   ERR_ENTRY_ALREADY_EXISTS (not
1593                          *   ERR_ATTRIBUTE_OR_VALUE_EXISTS!)
1594                          * - "delete" operations can only be performed when the
1595                          *   member does exist - if not then return
1596                          *   ERR_UNWILLING_TO_PERFORM (not
1597                          *   ERR_NO_SUCH_ATTRIBUTE!)
1598                          * - primary group check
1599                          */
1600                         mo = samdb_find_attribute(ldb, res->msgs[0], "member",
1601                                                   ldb_dn_get_linearized(member_dn));
1602                         if (mo == NULL) {
1603                                 cnt = 0;
1604                         } else {
1605                                 cnt = 1;
1606                         }
1607
1608                         if ((cnt > 0) && (LDB_FLAG_MOD_TYPE(el->flags)
1609                             == LDB_FLAG_MOD_ADD)) {
1610                                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
1611                         }
1612                         if ((cnt == 0) && LDB_FLAG_MOD_TYPE(el->flags)
1613                             == LDB_FLAG_MOD_DELETE) {
1614                                 return LDB_ERR_UNWILLING_TO_PERFORM;
1615                         }
1616
1617                         /* Denies to add "member"s to groups which are primary
1618                          * ones for them - in this case return
1619                          * ERR_ENTRY_ALREADY_EXISTS. */
1620
1621                         ret = dsdb_module_search_dn(ac->module, ac, &group_res,
1622                                                     member_dn, group_attrs,
1623                                                     DSDB_FLAG_NEXT_MODULE, ac->req);
1624                         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1625                                 /* member DN doesn't exist yet */
1626                                 continue;
1627                         }
1628                         if (ret != LDB_SUCCESS) {
1629                                 return ret;
1630                         }
1631                         prim_group_rid = ldb_msg_find_attr_as_uint(group_res->msgs[0], "primaryGroupID", (uint32_t)-1);
1632                         if (prim_group_rid == (uint32_t) -1) {
1633                                 /* the member hasn't to be a user account ->
1634                                  * therefore no check needed in this case. */
1635                                 continue;
1636                         }
1637
1638                         sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb),
1639                                               prim_group_rid);
1640                         if (sid == NULL) {
1641                                 return ldb_operr(ldb);
1642                         }
1643
1644                         if (dom_sid_equal(group_sid, sid)) {
1645                                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
1646                         }
1647                 }
1648         }
1649
1650         talloc_free(res);
1651
1652         return LDB_SUCCESS;
1653 }
1654
1655 /* SAM objects have special rules regarding the "description" attribute on
1656  * modify operations. */
1657 static int samldb_description_check(struct samldb_ctx *ac, bool *modified)
1658 {
1659         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1660         const char * const attrs[] = { "objectClass", "description", NULL };
1661         struct ldb_result *res;
1662         unsigned int i;
1663         int ret;
1664
1665         /* Fetch information from the existing object */
1666         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1667                                  DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED, ac->req,
1668                                  "(|(objectclass=user)(objectclass=group)(objectclass=samDomain)(objectclass=samServer))");
1669         if (ret != LDB_SUCCESS) {
1670                 /* don't treat it specially ... let normal error codes
1671                    happen from other places */
1672                 ldb_reset_err_string(ldb);
1673                 return LDB_SUCCESS;
1674         }
1675         if (res->count == 0) {
1676                 /* we didn't match the filter */
1677                 talloc_free(res);
1678                 return LDB_SUCCESS;
1679         }
1680
1681         /* We've to walk over all modification entries and consider the
1682          * "description" ones. */
1683         for (i = 0; i < ac->msg->num_elements; i++) {
1684                 if (ldb_attr_cmp(ac->msg->elements[i].name, "description") == 0) {
1685                         ac->msg->elements[i].flags |= LDB_FLAG_INTERNAL_FORCE_SINGLE_VALUE_CHECK;
1686                         *modified = true;
1687                 }
1688         }
1689
1690         talloc_free(res);
1691
1692         return LDB_SUCCESS;
1693 }
1694
1695 /* This trigger adapts the "servicePrincipalName" attributes if the
1696  * "dNSHostName" and/or "sAMAccountName" attribute change(s) */
1697 static int samldb_service_principal_names_change(struct samldb_ctx *ac)
1698 {
1699         struct ldb_context *ldb = ldb_module_get_ctx(ac->module);
1700         struct ldb_message_element *el = NULL, *el2 = NULL;
1701         struct ldb_message *msg;
1702         const char *attrs[] = { "servicePrincipalName", NULL };
1703         struct ldb_result *res;
1704         const char *dns_hostname = NULL, *old_dns_hostname = NULL,
1705                    *sam_accountname = NULL, *old_sam_accountname = NULL;
1706         unsigned int i;
1707         int ret;
1708
1709         el = dsdb_get_single_valued_attr(ac->msg, "dNSHostName",
1710                                          ac->req->operation);
1711         el2 = dsdb_get_single_valued_attr(ac->msg, "sAMAccountName",
1712                                           ac->req->operation);
1713         if ((el == NULL) && (el2 == NULL)) {
1714                 /* we are not affected */
1715                 return LDB_SUCCESS;
1716         }
1717
1718         /* Create a temporary message for fetching the "dNSHostName" */
1719         if (el != NULL) {
1720                 const char *dns_attrs[] = { "dNSHostName", NULL };
1721                 msg = ldb_msg_new(ac->msg);
1722                 if (msg == NULL) {
1723                         return ldb_module_oom(ac->module);
1724                 }
1725                 ret = ldb_msg_add(msg, el, 0);
1726                 if (ret != LDB_SUCCESS) {
1727                         return ret;
1728                 }
1729                 dns_hostname = talloc_steal(ac,
1730                                             ldb_msg_find_attr_as_string(msg, "dNSHostName", NULL));
1731                 talloc_free(msg);
1732
1733                 ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn,
1734                                             dns_attrs, DSDB_FLAG_NEXT_MODULE, ac->req);
1735                 if (ret == LDB_SUCCESS) {
1736                         old_dns_hostname = ldb_msg_find_attr_as_string(res->msgs[0], "dNSHostName", NULL);
1737                 }
1738         }
1739
1740         /* Create a temporary message for fetching the "sAMAccountName" */
1741         if (el2 != NULL) {
1742                 char *tempstr, *tempstr2;
1743                 const char *acct_attrs[] = { "sAMAccountName", NULL };
1744
1745                 msg = ldb_msg_new(ac->msg);
1746                 if (msg == NULL) {
1747                         return ldb_module_oom(ac->module);
1748                 }
1749                 ret = ldb_msg_add(msg, el2, 0);
1750                 if (ret != LDB_SUCCESS) {
1751                         return ret;
1752                 }
1753                 tempstr = talloc_strdup(ac,
1754                                         ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL));
1755                 talloc_free(msg);
1756
1757                 ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, acct_attrs,
1758                                             DSDB_FLAG_NEXT_MODULE, ac->req);
1759                 if (ret == LDB_SUCCESS) {
1760                         tempstr2 = talloc_strdup(ac,
1761                                                  ldb_msg_find_attr_as_string(res->msgs[0],
1762                                                                              "sAMAccountName", NULL));
1763                 }
1764
1765
1766                 /* The "sAMAccountName" needs some additional trimming: we need
1767                  * to remove the trailing "$"s if they exist. */
1768                 if ((tempstr != NULL) && (tempstr[0] != '\0') &&
1769                     (tempstr[strlen(tempstr) - 1] == '$')) {
1770                         tempstr[strlen(tempstr) - 1] = '\0';
1771                 }
1772                 if ((tempstr2 != NULL) && (tempstr2[0] != '\0') &&
1773                     (tempstr2[strlen(tempstr2) - 1] == '$')) {
1774                         tempstr2[strlen(tempstr2) - 1] = '\0';
1775                 }
1776                 sam_accountname = tempstr;
1777                 old_sam_accountname = tempstr2;
1778         }
1779
1780         if (old_dns_hostname == NULL) {
1781                 /* we cannot change when the old name is unknown */
1782                 dns_hostname = NULL;
1783         }
1784         if ((old_dns_hostname != NULL) && (dns_hostname != NULL) &&
1785             (strcasecmp(old_dns_hostname, dns_hostname) == 0)) {
1786                 /* The "dNSHostName" didn't change */
1787                 dns_hostname = NULL;
1788         }
1789
1790         if (old_sam_accountname == NULL) {
1791                 /* we cannot change when the old name is unknown */
1792                 sam_accountname = NULL;
1793         }
1794         if ((old_sam_accountname != NULL) && (sam_accountname != NULL) &&
1795             (strcasecmp(old_sam_accountname, sam_accountname) == 0)) {
1796                 /* The "sAMAccountName" didn't change */
1797                 sam_accountname = NULL;
1798         }
1799
1800         if ((dns_hostname == NULL) && (sam_accountname == NULL)) {
1801                 /* Well, there are information missing (old name(s)) or the
1802                  * names didn't change. We've nothing to do and can exit here */
1803                 return LDB_SUCCESS;
1804         }
1805
1806         /* Potential "servicePrincipalName" changes in the same request have to
1807          * be handled before the update (Windows behaviour). */
1808         el = ldb_msg_find_element(ac->msg, "servicePrincipalName");
1809         if (el != NULL) {
1810                 msg = ldb_msg_new(ac->msg);
1811                 if (msg == NULL) {
1812                         return ldb_module_oom(ac->module);
1813                 }
1814                 msg->dn = ac->msg->dn;
1815
1816                 do {
1817                         ret = ldb_msg_add(msg, el, el->flags);
1818                         if (ret != LDB_SUCCESS) {
1819                                 return ret;
1820                         }
1821
1822                         ldb_msg_remove_element(ac->msg, el);
1823
1824                         el = ldb_msg_find_element(ac->msg,
1825                                                   "servicePrincipalName");
1826                 } while (el != NULL);
1827
1828                 ret = dsdb_module_modify(ac->module, msg,
1829                                          DSDB_FLAG_NEXT_MODULE, ac->req);
1830                 if (ret != LDB_SUCCESS) {
1831                         return ret;
1832                 }
1833                 talloc_free(msg);
1834         }
1835
1836         /* Fetch the "servicePrincipalName"s if any */
1837         ret = dsdb_module_search(ac->module, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs,
1838                                  DSDB_FLAG_NEXT_MODULE, ac->req, NULL);
1839         if (ret != LDB_SUCCESS) {
1840                 return ret;
1841         }
1842         if ((res->count != 1) || (res->msgs[0]->num_elements > 1)) {
1843                 return ldb_operr(ldb);
1844         }
1845
1846         if (res->msgs[0]->num_elements == 1) {
1847                 /* Yes, we do have "servicePrincipalName"s. First we update them
1848                  * locally, that means we do always substitute the current
1849                  * "dNSHostName" with the new one and/or "sAMAccountName"
1850                  * without "$" with the new one and then we append this to the
1851                  * modification request (Windows behaviour). */
1852
1853                 for (i = 0; i < res->msgs[0]->elements[0].num_values; i++) {
1854                         char *old_str, *new_str, *pos;
1855                         const char *tok;
1856
1857                         old_str = (char *)
1858                                 res->msgs[0]->elements[0].values[i].data;
1859
1860                         new_str = talloc_strdup(ac->msg,
1861                                                 strtok_r(old_str, "/", &pos));
1862                         if (new_str == NULL) {
1863                                 return ldb_module_oom(ac->module);
1864                         }
1865
1866                         while ((tok = strtok_r(NULL, "/", &pos)) != NULL) {
1867                                 if ((dns_hostname != NULL) &&
1868                                     (strcasecmp(tok, old_dns_hostname) == 0)) {
1869                                         tok = dns_hostname;
1870                                 }
1871                                 if ((sam_accountname != NULL) &&
1872                                     (strcasecmp(tok, old_sam_accountname) == 0)) {
1873                                         tok = sam_accountname;
1874                                 }
1875
1876                                 new_str = talloc_asprintf(ac->msg, "%s/%s",
1877                                                           new_str, tok);
1878                                 if (new_str == NULL) {
1879                                         return ldb_module_oom(ac->module);
1880                                 }
1881                         }
1882
1883                         ret = ldb_msg_add_string(ac->msg,
1884                                                  "servicePrincipalName",
1885                                                  new_str);
1886                         if (ret != LDB_SUCCESS) {
1887                                 return ret;
1888                         }
1889                 }
1890
1891                 el = ldb_msg_find_element(ac->msg, "servicePrincipalName");
1892                 el->flags = LDB_FLAG_MOD_REPLACE;
1893         }
1894
1895         talloc_free(res);
1896
1897         return LDB_SUCCESS;
1898 }
1899
1900
1901 /* add */
1902 static int samldb_add(struct ldb_module *module, struct ldb_request *req)
1903 {
1904         struct ldb_context *ldb;
1905         struct samldb_ctx *ac;
1906         int ret;
1907
1908         ldb = ldb_module_get_ctx(module);
1909         ldb_debug(ldb, LDB_DEBUG_TRACE, "samldb_add\n");
1910
1911         /* do not manipulate our control entries */
1912         if (ldb_dn_is_special(req->op.add.message->dn)) {
1913                 return ldb_next_request(module, req);
1914         }
1915
1916         ac = samldb_ctx_init(module, req);
1917         if (ac == NULL) {
1918                 return ldb_operr(ldb);
1919         }
1920
1921         /* build the new msg */
1922         ac->msg = ldb_msg_copy_shallow(ac, req->op.add.message);
1923         if (ac->msg == NULL) {
1924                 talloc_free(ac);
1925                 ldb_debug(ldb, LDB_DEBUG_FATAL,
1926                           "samldb_add: ldb_msg_copy_shallow failed!\n");
1927                 return ldb_operr(ldb);
1928         }
1929
1930         if (samdb_find_attribute(ldb, ac->msg,
1931                                  "objectclass", "user") != NULL) {
1932                 ac->type = "user";
1933
1934                 ret = samldb_prim_group_trigger(ac);
1935                 if (ret != LDB_SUCCESS) {
1936                         return ret;
1937                 }
1938
1939                 ret = samldb_objectclass_trigger(ac);
1940                 if (ret != LDB_SUCCESS) {
1941                         return ret;
1942                 }
1943
1944                 return samldb_fill_object(ac);
1945         }
1946
1947         if (samdb_find_attribute(ldb, ac->msg,
1948                                  "objectclass", "group") != NULL) {
1949                 ac->type = "group";
1950
1951                 ret = samldb_objectclass_trigger(ac);
1952                 if (ret != LDB_SUCCESS) {
1953                         return ret;
1954                 }
1955
1956                 return samldb_fill_object(ac);
1957         }
1958
1959         /* perhaps a foreignSecurityPrincipal? */
1960         if (samdb_find_attribute(ldb, ac->msg,
1961                                  "objectclass",
1962                                  "foreignSecurityPrincipal") != NULL) {
1963                 return samldb_fill_foreignSecurityPrincipal_object(ac);
1964         }
1965
1966         if (samdb_find_attribute(ldb, ac->msg,
1967                                  "objectclass", "classSchema") != NULL) {
1968                 ret = samldb_schema_info_update(ac);
1969                 if (ret != LDB_SUCCESS) {
1970                         talloc_free(ac);
1971                         return ret;
1972                 }
1973
1974                 ac->type = "classSchema";
1975                 return samldb_fill_object(ac);
1976         }
1977
1978         if (samdb_find_attribute(ldb, ac->msg,
1979                                  "objectclass", "attributeSchema") != NULL) {
1980                 ret = samldb_schema_info_update(ac);
1981                 if (ret != LDB_SUCCESS) {
1982                         talloc_free(ac);
1983                         return ret;
1984                 }
1985
1986                 ac->type = "attributeSchema";
1987                 return samldb_fill_object(ac);
1988         }
1989
1990         talloc_free(ac);
1991
1992         /* nothing matched, go on */
1993         return ldb_next_request(module, req);
1994 }
1995
1996 /* modify */
1997 static int samldb_modify(struct ldb_module *module, struct ldb_request *req)
1998 {
1999         struct ldb_context *ldb;
2000         struct samldb_ctx *ac;
2001         struct ldb_message_element *el, *el2;
2002         bool modified = false;
2003         int ret;
2004
2005         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2006                 /* do not manipulate our control entries */
2007                 return ldb_next_request(module, req);
2008         }
2009
2010         ldb = ldb_module_get_ctx(module);
2011
2012         /* make sure that "objectSid" is not specified */
2013         el = ldb_msg_find_element(req->op.mod.message, "objectSid");
2014         if (el != NULL) {
2015                 ldb_set_errstring(ldb,
2016                                   "samldb: objectSid must not be specified!");
2017                 return LDB_ERR_UNWILLING_TO_PERFORM;
2018         }
2019         /* make sure that "sAMAccountType" is not specified */
2020         el = ldb_msg_find_element(req->op.mod.message, "sAMAccountType");
2021         if (el != NULL) {
2022                 ldb_set_errstring(ldb,
2023                                   "samldb: sAMAccountType must not be specified!");
2024                 return LDB_ERR_UNWILLING_TO_PERFORM;
2025         }
2026         /* make sure that "isCriticalSystemObject" is not specified */
2027         el = ldb_msg_find_element(req->op.mod.message, "isCriticalSystemObject");
2028         if (el != NULL) {
2029                 if (ldb_request_get_control(req, LDB_CONTROL_RELAX_OID) == NULL) {
2030                         ldb_set_errstring(ldb,
2031                                           "samldb: isCriticalSystemObject must not be specified!");
2032                         return LDB_ERR_UNWILLING_TO_PERFORM;
2033                 }
2034         }
2035
2036         /* msDS-IntId is not allowed to be modified
2037          * except when modification comes from replication */
2038         if (ldb_msg_find_element(req->op.mod.message, "msDS-IntId")) {
2039                 if (!ldb_request_get_control(req,
2040                                              DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
2041                         return LDB_ERR_CONSTRAINT_VIOLATION;
2042                 }
2043         }
2044
2045         ac = samldb_ctx_init(module, req);
2046         if (ac == NULL) {
2047                 return ldb_operr(ldb);
2048         }
2049
2050         /* build the new msg */
2051         ac->msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2052         if (ac->msg == NULL) {
2053                 talloc_free(ac);
2054                 ldb_debug(ldb, LDB_DEBUG_FATAL,
2055                           "samldb_modify: ldb_msg_copy_shallow failed!\n");
2056                 return ldb_operr(ldb);
2057         }
2058
2059         el = ldb_msg_find_element(ac->msg, "primaryGroupID");
2060         if (el != NULL) {
2061                 ret = samldb_prim_group_change(ac);
2062                 if (ret != LDB_SUCCESS) {
2063                         return ret;
2064                 }
2065         }
2066
2067         el = ldb_msg_find_element(ac->msg, "userAccountControl");
2068         if (el != NULL) {
2069                 modified = true;
2070                 ret = samldb_user_account_control_change(ac);
2071                 if (ret != LDB_SUCCESS) {
2072                         return ret;
2073                 }
2074         }
2075
2076         el = ldb_msg_find_element(ac->msg, "groupType");
2077         if (el != NULL) {
2078                 modified = true;
2079                 ret = samldb_group_type_change(ac);
2080                 if (ret != LDB_SUCCESS) {
2081                         return ret;
2082                 }
2083         }
2084
2085         el = ldb_msg_find_element(ac->msg, "sAMAccountName");
2086         if (el != NULL) {
2087                 ret = samldb_sam_accountname_check(ac);
2088                 if (ret != LDB_SUCCESS) {
2089                         return ret;
2090                 }
2091         }
2092
2093         el = ldb_msg_find_element(ac->msg, "member");
2094         if (el != NULL) {
2095                 ret = samldb_member_check(ac);
2096                 if (ret != LDB_SUCCESS) {
2097                         return ret;
2098                 }
2099         }
2100
2101         el = ldb_msg_find_element(ac->msg, "description");
2102         if (el != NULL) {
2103                 ret = samldb_description_check(ac, &modified);
2104                 if (ret != LDB_SUCCESS) {
2105                         return ret;
2106                 }
2107         }
2108
2109         el = ldb_msg_find_element(ac->msg, "dNSHostName");
2110         el2 = ldb_msg_find_element(ac->msg, "sAMAccountName");
2111         if ((el != NULL) || (el2 != NULL)) {
2112                 modified = true;
2113                 ret = samldb_service_principal_names_change(ac);
2114                 if (ret != LDB_SUCCESS) {
2115                         return ret;
2116                 }
2117         }
2118
2119         if (modified) {
2120                 struct ldb_request *child_req;
2121
2122                 /* Now perform the real modifications as a child request */
2123                 ret = ldb_build_mod_req(&child_req, ldb, ac,
2124                                         ac->msg,
2125                                         req->controls,
2126                                         req, dsdb_next_callback,
2127                                         req);
2128                 LDB_REQ_SET_LOCATION(child_req);
2129                 if (ret != LDB_SUCCESS) {
2130                         return ret;
2131                 }
2132
2133                 return ldb_next_request(module, child_req);
2134         }
2135
2136         talloc_free(ac);
2137
2138         /* no change which interests us, go on */
2139         return ldb_next_request(module, req);
2140 }
2141
2142 /* delete */
2143
2144 static int samldb_prim_group_users_check(struct samldb_ctx *ac)
2145 {
2146         struct ldb_context *ldb;
2147         struct dom_sid *sid;
2148         uint32_t rid;
2149         NTSTATUS status;
2150         int ret;
2151         struct ldb_result *res;
2152         const char *attrs[] = { "objectSid", NULL };
2153         const char *noattrs[] = { NULL };
2154
2155         ldb = ldb_module_get_ctx(ac->module);
2156
2157         /* Finds out the SID/RID of the SAM object */
2158         ret = dsdb_module_search_dn(ac->module, ac, &res, ac->req->op.del.dn, attrs, DSDB_FLAG_NEXT_MODULE, ac->req);
2159         if (ret != LDB_SUCCESS) {
2160                 return ret;
2161         }
2162
2163         sid = samdb_result_dom_sid(ac, res->msgs[0], "objectSid");
2164         if (sid == NULL) {
2165                 /* No SID - it might not be a SAM object - therefore ok */
2166                 return LDB_SUCCESS;
2167         }
2168         status = dom_sid_split_rid(ac, sid, NULL, &rid);
2169         if (!NT_STATUS_IS_OK(status)) {
2170                 return ldb_operr(ldb);
2171         }
2172         if (rid == 0) {
2173                 /* Special object (security principal?) */
2174                 return LDB_SUCCESS;
2175         }
2176
2177         /* Deny delete requests from groups which are primary ones */
2178         ret = dsdb_module_search(ac->module, ac, &res, NULL, LDB_SCOPE_SUBTREE, noattrs,
2179                                  DSDB_FLAG_NEXT_MODULE,
2180                                  ac->req,
2181                                  "(&(primaryGroupID=%u)(objectClass=user))", rid);
2182         if (ret != LDB_SUCCESS) {
2183                 return ret;
2184         }
2185         if (res->count > 0) {
2186                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
2187         }
2188
2189         return LDB_SUCCESS;
2190 }
2191
2192 static int samldb_delete(struct ldb_module *module, struct ldb_request *req)
2193 {
2194         struct samldb_ctx *ac;
2195         int ret;
2196
2197         if (ldb_dn_is_special(req->op.del.dn)) {
2198                 /* do not manipulate our control entries */
2199                 return ldb_next_request(module, req);
2200         }
2201
2202         ac = samldb_ctx_init(module, req);
2203         if (ac == NULL) {
2204                 return ldb_operr(ldb_module_get_ctx(module));
2205         }
2206
2207         ret = samldb_prim_group_users_check(ac);
2208         if (ret != LDB_SUCCESS) {
2209                 return ret;
2210         }
2211
2212         talloc_free(ac);
2213
2214         return ldb_next_request(module, req);
2215 }
2216
2217 /* extended */
2218
2219 static int samldb_extended_allocate_rid_pool(struct ldb_module *module, struct ldb_request *req)
2220 {
2221         struct ldb_context *ldb = ldb_module_get_ctx(module);
2222         struct dsdb_fsmo_extended_op *exop;
2223         int ret;
2224
2225         exop = talloc_get_type(req->op.extended.data,
2226                                struct dsdb_fsmo_extended_op);
2227         if (!exop) {
2228                 ldb_set_errstring(ldb,
2229                                   "samldb_extended_allocate_rid_pool: invalid extended data");
2230                 return LDB_ERR_PROTOCOL_ERROR;
2231         }
2232
2233         ret = ridalloc_allocate_rid_pool_fsmo(module, exop, req);
2234         if (ret != LDB_SUCCESS) {
2235                 return ret;
2236         }
2237
2238         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2239 }
2240
2241 static int samldb_extended(struct ldb_module *module, struct ldb_request *req)
2242 {
2243         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_ALLOCATE_RID_POOL) == 0) {
2244                 return samldb_extended_allocate_rid_pool(module, req);
2245         }
2246
2247         return ldb_next_request(module, req);
2248 }
2249
2250
2251 static const struct ldb_module_ops ldb_samldb_module_ops = {
2252         .name          = "samldb",
2253         .add           = samldb_add,
2254         .modify        = samldb_modify,
2255         .del           = samldb_delete,
2256         .extended      = samldb_extended
2257 };
2258
2259
2260 int ldb_samldb_module_init(const char *version)
2261 {
2262         LDB_MODULE_CHECK_VERSION(version);
2263         return ldb_register_module(&ldb_samldb_module_ops);
2264 }