source4/dsdb/samdb/ldb_modules/descriptor.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Simo Sorce  2006-2008
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2007
   6    Copyright (C) Nadezhda Ivanova  2009
   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: DS Security descriptor module
  26  *
  27  *  Description:
  28  *  - Calculate the security descriptor of a newly created object
  29  *  - Perform sd recalculation on a move operation
  30  *  - Handle sd modification invariants
  31  *
  32  *  Author: Nadezhda Ivanova
  33  */
  34
  35 #include "includes.h"
  36 #include <ldb_module.h>
  37 #include "util/dlinklist.h"
  38 #include "dsdb/samdb/samdb.h"
  39 #include "librpc/ndr/libndr.h"
  40 #include "librpc/gen_ndr/ndr_security.h"
  41 #include "libcli/security/security.h"
  42 #include "auth/auth.h"
  43 #include "param/param.h"
  44 #include "dsdb/samdb/ldb_modules/util.h"
  45
  46 struct descriptor_data {
  47         int _dummy;
  48 };
  49
  50 struct descriptor_context {
  51         struct ldb_module *module;
  52         struct ldb_request *req;
  53         struct ldb_message *msg;
  54         struct ldb_reply *search_res;
  55         struct ldb_reply *search_oc_res;
  56         struct ldb_val *parentsd_val;
  57         struct ldb_message_element *sd_element;
  58         struct ldb_val *sd_val;
  59         uint32_t sd_flags;
  60         int (*step_fn)(struct descriptor_context *);
  61 };
  62
  63 static struct dom_sid *get_default_ag(TALLOC_CTX *mem_ctx,
  64                                struct ldb_dn *dn,
  65                                struct security_token *token,
  66                                struct ldb_context *ldb)
  67 {
  68         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
  69         const struct dom_sid *domain_sid = samdb_domain_sid(ldb);
  70         struct dom_sid *da_sid = dom_sid_add_rid(tmp_ctx, domain_sid, DOMAIN_RID_ADMINS);
  71         struct dom_sid *ea_sid = dom_sid_add_rid(tmp_ctx, domain_sid, DOMAIN_RID_ENTERPRISE_ADMINS);
  72         struct dom_sid *sa_sid = dom_sid_add_rid(tmp_ctx, domain_sid, DOMAIN_RID_SCHEMA_ADMINS);
  73         struct dom_sid *dag_sid;
  74         struct ldb_dn *nc_root;
  75         int ret;
  76
  77         ret = dsdb_find_nc_root(ldb, tmp_ctx, dn, &nc_root);
  78         if (ret != LDB_SUCCESS) {
  79                 talloc_free(tmp_ctx);
  80                 return NULL;
  81         }
  82
  83         if (ldb_dn_compare(nc_root, ldb_get_schema_basedn(ldb)) == 0) {
  84                 if (security_token_has_sid(token, sa_sid)) {
  85                         dag_sid = dom_sid_dup(mem_ctx, sa_sid);
  86                 } else if (security_token_has_sid(token, ea_sid)) {
  87                         dag_sid = dom_sid_dup(mem_ctx, ea_sid);
  88                 } else if (security_token_has_sid(token, da_sid)) {
  89                         dag_sid = dom_sid_dup(mem_ctx, da_sid);
  90                 } else if (security_token_is_system(token)) {
  91                         dag_sid = dom_sid_dup(mem_ctx, sa_sid);
  92                 } else {
  93                         dag_sid = NULL;
  94                 }
  95         } else if (ldb_dn_compare(nc_root, ldb_get_config_basedn(ldb)) == 0) {
  96                 if (security_token_has_sid(token, ea_sid)) {
  97                         dag_sid = dom_sid_dup(mem_ctx, ea_sid);
  98                 } else if (security_token_has_sid(token, da_sid)) {
  99                         dag_sid = dom_sid_dup(mem_ctx, da_sid);
 100                 } else if (security_token_is_system(token)) {
 101                         dag_sid = dom_sid_dup(mem_ctx, ea_sid);
 102                 } else {
 103                         dag_sid = NULL;
 104                 }
 105         } else if (ldb_dn_compare(nc_root, ldb_get_default_basedn(ldb)) == 0) {
 106                 if (security_token_has_sid(token, da_sid)) {
 107                         dag_sid = dom_sid_dup(mem_ctx, da_sid);
 108                 } else if (security_token_has_sid(token, ea_sid)) {
 109                                 dag_sid = dom_sid_dup(mem_ctx, ea_sid);
 110                 } else if (security_token_is_system(token)) {
 111                         dag_sid = dom_sid_dup(mem_ctx, da_sid);
 112                 } else {
 113                         dag_sid = NULL;
 114                 }
 115         } else {
 116                 dag_sid = NULL;
 117         }
 118
 119         talloc_free(tmp_ctx);
 120         return dag_sid;
 121 }
 122
 123 static struct security_descriptor *get_sd_unpacked(struct ldb_module *module, TALLOC_CTX *mem_ctx,
 124                                             const struct dsdb_class *objectclass)
 125 {
 126         struct ldb_context *ldb = ldb_module_get_ctx(module);
 127         struct security_descriptor *sd;
 128         const struct dom_sid *domain_sid = samdb_domain_sid(ldb);
 129
 130         if (!objectclass->defaultSecurityDescriptor || !domain_sid) {
 131                 return NULL;
 132         }
 133
 134         sd = sddl_decode(mem_ctx,
 135                          objectclass->defaultSecurityDescriptor,
 136                          domain_sid);
 137         return sd;
 138 }
 139
 140 static struct dom_sid *get_default_group(TALLOC_CTX *mem_ctx,
 141                                          struct ldb_context *ldb,
 142                                          struct dom_sid *dag)
 143 {
 144         if (dsdb_functional_level(ldb) >= DS_DOMAIN_FUNCTION_2008) {
 145                 return dag;
 146         }
 147
 148         return NULL;
 149 }
 150
 151 static struct security_descriptor *descr_handle_sd_flags(TALLOC_CTX *mem_ctx,
 152                                                          struct security_descriptor *new_sd,
 153                                                          struct security_descriptor *old_sd,
 154                                                          uint32_t sd_flags)
 155 {
 156         struct security_descriptor *final_sd;
 157         /* if there is no control or control == 0 modify everything */
 158         if (!sd_flags) {
 159                 return new_sd;
 160         }
 161
 162         final_sd = talloc_zero(mem_ctx, struct security_descriptor);
 163         final_sd->revision = SECURITY_DESCRIPTOR_REVISION_1;
 164         final_sd->type = SEC_DESC_SELF_RELATIVE;
 165
 166         if (sd_flags & (SECINFO_OWNER)) {
 167                 final_sd->owner_sid = talloc_memdup(mem_ctx, new_sd->owner_sid, sizeof(struct dom_sid));
 168                 final_sd->type |= new_sd->type & SEC_DESC_OWNER_DEFAULTED;
 169         }
 170         else if (old_sd) {
 171                 final_sd->owner_sid = talloc_memdup(mem_ctx, old_sd->owner_sid, sizeof(struct dom_sid));
 172                 final_sd->type |= old_sd->type & SEC_DESC_OWNER_DEFAULTED;
 173         }
 174
 175         if (sd_flags & (SECINFO_GROUP)) {
 176                 final_sd->group_sid = talloc_memdup(mem_ctx, new_sd->group_sid, sizeof(struct dom_sid));
 177                 final_sd->type |= new_sd->type & SEC_DESC_GROUP_DEFAULTED;
 178         }
 179         else if (old_sd) {
 180                 final_sd->group_sid = talloc_memdup(mem_ctx, old_sd->group_sid, sizeof(struct dom_sid));
 181                 final_sd->type |= old_sd->type & SEC_DESC_GROUP_DEFAULTED;
 182         }
 183
 184         if (sd_flags & (SECINFO_SACL)) {
 185                 final_sd->sacl = security_acl_dup(mem_ctx,new_sd->sacl);
 186                 final_sd->type |= new_sd->type & (SEC_DESC_SACL_PRESENT |
 187                         SEC_DESC_SACL_DEFAULTED|SEC_DESC_SACL_AUTO_INHERIT_REQ |
 188                         SEC_DESC_SACL_AUTO_INHERITED|SEC_DESC_SACL_PROTECTED |
 189                         SEC_DESC_SERVER_SECURITY);
 190         }
 191         else if (old_sd && old_sd->sacl) {
 192                 final_sd->sacl = security_acl_dup(mem_ctx,old_sd->sacl);
 193                 final_sd->type |= old_sd->type & (SEC_DESC_SACL_PRESENT |
 194                         SEC_DESC_SACL_DEFAULTED|SEC_DESC_SACL_AUTO_INHERIT_REQ |
 195                         SEC_DESC_SACL_AUTO_INHERITED|SEC_DESC_SACL_PROTECTED |
 196                         SEC_DESC_SERVER_SECURITY);
 197         }
 198
 199         if (sd_flags & (SECINFO_DACL)) {
 200                 final_sd->dacl = security_acl_dup(mem_ctx,new_sd->dacl);
 201                 final_sd->type |= new_sd->type & (SEC_DESC_DACL_PRESENT |
 202                         SEC_DESC_DACL_DEFAULTED|SEC_DESC_DACL_AUTO_INHERIT_REQ |
 203                         SEC_DESC_DACL_AUTO_INHERITED|SEC_DESC_DACL_PROTECTED |
 204                         SEC_DESC_DACL_TRUSTED);
 205         }
 206         else if (old_sd && old_sd->dacl) {
 207                 final_sd->dacl = security_acl_dup(mem_ctx,old_sd->dacl);
 208                 final_sd->type |= old_sd->type & (SEC_DESC_DACL_PRESENT |
 209                         SEC_DESC_DACL_DEFAULTED|SEC_DESC_DACL_AUTO_INHERIT_REQ |
 210                         SEC_DESC_DACL_AUTO_INHERITED|SEC_DESC_DACL_PROTECTED |
 211                         SEC_DESC_DACL_TRUSTED);
 212         }
 213         /* not so sure about this */
 214         final_sd->type |= new_sd->type & SEC_DESC_RM_CONTROL_VALID;
 215         return final_sd;
 216 }
 217
 218 static DATA_BLOB *get_new_descriptor(struct ldb_module *module,
 219                                      struct ldb_dn *dn,
 220                                      TALLOC_CTX *mem_ctx,
 221                                      const struct dsdb_class *objectclass,
 222                                      const struct ldb_val *parent,
 223                                      const struct ldb_val *object,
 224                                      const struct ldb_val *old_sd,
 225                                      uint32_t sd_flags)
 226 {
 227         struct security_descriptor *user_descriptor = NULL, *parent_descriptor = NULL;
 228         struct security_descriptor *old_descriptor = NULL;
 229         struct security_descriptor *new_sd, *final_sd;
 230         DATA_BLOB *linear_sd;
 231         enum ndr_err_code ndr_err;
 232         struct ldb_context *ldb = ldb_module_get_ctx(module);
 233         struct auth_session_info *session_info
 234                 = ldb_get_opaque(ldb, "sessionInfo");
 235         const struct dom_sid *domain_sid = samdb_domain_sid(ldb);
 236         char *sddl_sd;
 237         struct dom_sid *default_owner;
 238         struct dom_sid *default_group;
 239         struct security_descriptor *default_descriptor = NULL;
 240
 241         if (objectclass != NULL) {
 242                 default_descriptor = get_sd_unpacked(module, mem_ctx, objectclass);
 243         }
 244
 245         if (object) {
 246                 user_descriptor = talloc(mem_ctx, struct security_descriptor);
 247                 if (!user_descriptor) {
 248                         return NULL;
 249                 }
 250                 ndr_err = ndr_pull_struct_blob(object, user_descriptor,
 251                                                user_descriptor,
 252                                                (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
 253
 254                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 255                         talloc_free(user_descriptor);
 256                         return NULL;
 257                 }
 258         } else {
 259                 user_descriptor = default_descriptor;
 260         }
 261
 262         if (old_sd) {
 263                 old_descriptor = talloc(mem_ctx, struct security_descriptor);
 264                 if (!old_descriptor) {
 265                         return NULL;
 266                 }
 267                 ndr_err = ndr_pull_struct_blob(old_sd, old_descriptor,
 268                                                old_descriptor,
 269                                                (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
 270
 271                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 272                         talloc_free(old_descriptor);
 273                         return NULL;
 274                 }
 275         }
 276
 277         if (parent) {
 278                 parent_descriptor = talloc(mem_ctx, struct security_descriptor);
 279                 if (!parent_descriptor) {
 280                         return NULL;
 281                 }
 282                 ndr_err = ndr_pull_struct_blob(parent, parent_descriptor,
 283                                                parent_descriptor,
 284                                                (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
 285
 286                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 287                         talloc_free(parent_descriptor);
 288                         return NULL;
 289                 }
 290         }
 291
 292         if (user_descriptor && default_descriptor &&
 293             (user_descriptor->dacl == NULL))
 294         {
 295                 user_descriptor->dacl = default_descriptor->dacl;
 296                 user_descriptor->type |= default_descriptor->type & (
 297                         SEC_DESC_DACL_PRESENT |
 298                         SEC_DESC_DACL_DEFAULTED|SEC_DESC_DACL_AUTO_INHERIT_REQ |
 299                         SEC_DESC_DACL_AUTO_INHERITED|SEC_DESC_DACL_PROTECTED |
 300                         SEC_DESC_DACL_TRUSTED);
 301         }
 302
 303         if (user_descriptor && default_descriptor &&
 304             (user_descriptor->sacl == NULL))
 305         {
 306                 user_descriptor->sacl = default_descriptor->sacl;
 307                 user_descriptor->type |= default_descriptor->type & (
 308                         SEC_DESC_SACL_PRESENT |
 309                         SEC_DESC_SACL_DEFAULTED|SEC_DESC_SACL_AUTO_INHERIT_REQ |
 310                         SEC_DESC_SACL_AUTO_INHERITED|SEC_DESC_SACL_PROTECTED |
 311                         SEC_DESC_SERVER_SECURITY);
 312         }
 313
 314         default_owner = get_default_ag(mem_ctx, dn,
 315                                        session_info->security_token, ldb);
 316         default_group = get_default_group(mem_ctx, ldb, default_owner);
 317         new_sd = create_security_descriptor(mem_ctx, parent_descriptor, user_descriptor, true,
 318                                             NULL, SEC_DACL_AUTO_INHERIT|SEC_SACL_AUTO_INHERIT,
 319                                             session_info->security_token,
 320                                             default_owner, default_group,
 321                                             map_generic_rights_ds);
 322         if (!new_sd) {
 323                 return NULL;
 324         }
 325         final_sd = descr_handle_sd_flags(mem_ctx, new_sd, old_descriptor, sd_flags);
 326
 327         if (!final_sd) {
 328                 return NULL;
 329         }
 330
 331         if (final_sd->dacl) {
 332                 final_sd->dacl->revision = SECURITY_ACL_REVISION_ADS;
 333         }
 334         if (final_sd->sacl) {
 335                 final_sd->sacl->revision = SECURITY_ACL_REVISION_ADS;
 336         }
 337
 338         sddl_sd = sddl_encode(mem_ctx, final_sd, domain_sid);
 339         DEBUG(10, ("Object %s created with desriptor %s\n\n", ldb_dn_get_linearized(dn), sddl_sd));
 340
 341         linear_sd = talloc(mem_ctx, DATA_BLOB);
 342         if (!linear_sd) {
 343                 return NULL;
 344         }
 345
 346         ndr_err = ndr_push_struct_blob(linear_sd, mem_ctx,
 347                                        final_sd,
 348                                        (ndr_push_flags_fn_t)ndr_push_security_descriptor);
 349         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 350                 return NULL;
 351         }
 352
 353         return linear_sd;
 354 }
 355
 356 static DATA_BLOB *descr_get_descriptor_to_show(struct ldb_module *module,
 357                                                TALLOC_CTX *mem_ctx,
 358                                                struct ldb_val *sd,
 359                                                uint32_t sd_flags)
 360 {
 361         struct security_descriptor *old_sd, *final_sd;
 362         DATA_BLOB *linear_sd;
 363         enum ndr_err_code ndr_err;
 364
 365         old_sd = talloc(mem_ctx, struct security_descriptor);
 366         if (!old_sd) {
 367                 return NULL;
 368         }
 369         ndr_err = ndr_pull_struct_blob(sd, old_sd,
 370                                        old_sd,
 371                                        (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
 372
 373         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 374                 talloc_free(old_sd);
 375                 return NULL;
 376         }
 377
 378         final_sd = descr_handle_sd_flags(mem_ctx, old_sd, NULL, sd_flags);
 379
 380         if (!final_sd) {
 381                 return NULL;
 382         }
 383
 384         linear_sd = talloc(mem_ctx, DATA_BLOB);
 385         if (!linear_sd) {
 386                 return NULL;
 387         }
 388
 389         ndr_err = ndr_push_struct_blob(linear_sd, mem_ctx,
 390                                        final_sd,
 391                                        (ndr_push_flags_fn_t)ndr_push_security_descriptor);
 392         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 393                 return NULL;
 394         }
 395
 396         return linear_sd;
 397 }
 398
 399 static struct descriptor_context *descriptor_init_context(struct ldb_module *module,
 400                                                           struct ldb_request *req)
 401 {
 402         struct ldb_context *ldb;
 403         struct descriptor_context *ac;
 404
 405         ldb = ldb_module_get_ctx(module);
 406
 407         ac = talloc_zero(req, struct descriptor_context);
 408         if (ac == NULL) {
 409                 ldb_set_errstring(ldb, "Out of Memory");
 410                 return NULL;
 411         }
 412
 413         ac->module = module;
 414         ac->req = req;
 415         return ac;
 416 }
 417
 418 static int descriptor_search_callback(struct ldb_request *req, struct ldb_reply *ares)
 419 {
 420         struct descriptor_context *ac;
 421         struct ldb_val *sd_val = NULL;
 422         struct ldb_message_element *sd_el;
 423         DATA_BLOB *show_sd;
 424         int ret;
 425
 426         ac = talloc_get_type(req->context, struct descriptor_context);
 427
 428         if (!ares) {
 429                 ret = LDB_ERR_OPERATIONS_ERROR;
 430                 goto fail;
 431         }
 432         if (ares->error != LDB_SUCCESS) {
 433                 return ldb_module_done(ac->req, ares->controls,
 434                                         ares->response, ares->error);
 435         }
 436
 437         switch (ares->type) {
 438         case LDB_REPLY_ENTRY:
 439                 sd_el = ldb_msg_find_element(ares->message, "nTSecurityDescriptor");
 440                 if (sd_el) {
 441                         sd_val = sd_el->values;
 442                 }
 443
 444                 if (sd_val) {
 445                         show_sd = descr_get_descriptor_to_show(ac->module, ac->req,
 446                                                                sd_val, ac->sd_flags);
 447                         if (!show_sd) {
 448                                 ret = LDB_ERR_OPERATIONS_ERROR;
 449                                 goto fail;
 450                         }
 451                         ldb_msg_remove_attr(ares->message, "nTSecurityDescriptor");
 452                         ret = ldb_msg_add_steal_value(ares->message, "nTSecurityDescriptor", show_sd);
 453                         if (ret != LDB_SUCCESS) {
 454                                 goto fail;
 455                         }
 456                 }
 457                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
 458
 459         case LDB_REPLY_REFERRAL:
 460                 return ldb_module_send_referral(ac->req, ares->referral);
 461
 462         case LDB_REPLY_DONE:
 463                 return ldb_module_done(ac->req, ares->controls,
 464                                         ares->response, ares->error);
 465         }
 466
 467 fail:
 468         talloc_free(ares);
 469         return ldb_module_done(ac->req, NULL, NULL, ret);
 470 }
 471
 472 static int descriptor_add(struct ldb_module *module, struct ldb_request *req)
 473 {
 474         struct ldb_context *ldb = ldb_module_get_ctx(module);
 475         struct ldb_request *add_req;
 476         struct ldb_message *msg;
 477         struct ldb_result *parent_res;
 478         const struct ldb_val *parent_sd = NULL;
 479         const struct ldb_val *user_sd;
 480         struct ldb_dn *dn = req->op.add.message->dn;
 481         struct ldb_dn *parent_dn, *nc_root;
 482         struct ldb_message_element *objectclass_element, *sd_element;
 483         int ret;
 484         const struct dsdb_schema *schema;
 485         DATA_BLOB *sd;
 486         const struct dsdb_class *objectclass;
 487         static const char * const parent_attrs[] = { "nTSecurityDescriptor", NULL };
 488         uint32_t instanceType;
 489         bool isNC = false;
 490         uint32_t sd_flags = dsdb_request_sd_flags(req, NULL);
 491
 492         /* do not manipulate our control entries */
 493         if (ldb_dn_is_special(dn)) {
 494                 return ldb_next_request(module, req);
 495         }
 496
 497         user_sd = ldb_msg_find_ldb_val(req->op.add.message, "nTSecurityDescriptor");
 498         sd_element = ldb_msg_find_element(req->op.add.message, "nTSecurityDescriptor");
 499         /* nTSecurityDescriptor without a value is an error, letting through so it is handled */
 500         if (user_sd == NULL && sd_element) {
 501                 return ldb_next_request(module, req);
 502         }
 503
 504         ldb_debug(ldb, LDB_DEBUG_TRACE,"descriptor_add: %s\n", ldb_dn_get_linearized(dn));
 505
 506         instanceType = ldb_msg_find_attr_as_uint(req->op.add.message, "instanceType", 0);
 507
 508         if (instanceType & INSTANCE_TYPE_IS_NC_HEAD) {
 509                 isNC = true;
 510         }
 511
 512         if (!isNC) {
 513                 ret = dsdb_find_nc_root(ldb, req, dn, &nc_root);
 514                 if (ret != LDB_SUCCESS) {
 515                         ldb_debug(ldb, LDB_DEBUG_TRACE,"descriptor_add: Could not find NC root for %s\n",
 516                                 ldb_dn_get_linearized(dn));
 517                         return ret;
 518                 }
 519
 520                 if (ldb_dn_compare(dn, nc_root) == 0) {
 521                         DEBUG(0, ("Found DN %s being a NC by the old method\n", ldb_dn_get_linearized(dn)));
 522                         isNC = true;
 523                 }
 524         }
 525
 526         if (isNC) {
 527                 DEBUG(2, ("DN: %s is a NC\n", ldb_dn_get_linearized(dn)));
 528         }
 529         if (!isNC) {
 530                 /* if the object has a parent, retrieve its SD to
 531                  * use for calculation. Unfortunately we do not yet have
 532                  * instanceType, so we use dsdb_find_nc_root. */
 533
 534                 parent_dn = ldb_dn_get_parent(req, dn);
 535                 if (parent_dn == NULL) {
 536                         return ldb_oom(ldb);
 537                 }
 538
 539                 /* we aren't any NC */
 540                 ret = dsdb_module_search_dn(module, req, &parent_res, parent_dn,
 541                                             parent_attrs,
 542                                             DSDB_FLAG_NEXT_MODULE |
 543                                             DSDB_FLAG_AS_SYSTEM |
 544                                             DSDB_SEARCH_SHOW_RECYCLED,
 545                                             req);
 546                 if (ret != LDB_SUCCESS) {
 547                         ldb_debug(ldb, LDB_DEBUG_TRACE,"descriptor_add: Could not find SD for %s\n",
 548                                   ldb_dn_get_linearized(parent_dn));
 549                         return ret;
 550                 }
 551                 if (parent_res->count != 1) {
 552                         return ldb_operr(ldb);
 553                 }
 554                 parent_sd = ldb_msg_find_ldb_val(parent_res->msgs[0], "nTSecurityDescriptor");
 555         }
 556
 557         schema = dsdb_get_schema(ldb, req);
 558
 559         objectclass_element = ldb_msg_find_element(req->op.add.message, "objectClass");
 560         if (objectclass_element == NULL) {
 561                 return ldb_operr(ldb);
 562         }
 563
 564         objectclass = dsdb_get_last_structural_class(schema,
 565                                                      objectclass_element);
 566         if (objectclass == NULL) {
 567                 return ldb_operr(ldb);
 568         }
 569
 570         /*
 571          * The SD_FLAG control is ignored on add
 572          * and we default to all bits set.
 573          */
 574         sd_flags = 0xF;
 575
 576         sd = get_new_descriptor(module, dn, req,
 577                                 objectclass, parent_sd,
 578                                 user_sd, NULL, sd_flags);
 579         if (sd == NULL) {
 580                 return ldb_operr(ldb);
 581         }
 582         msg = ldb_msg_copy_shallow(req, req->op.add.message);
 583         if (msg == NULL) {
 584                 return ldb_oom(ldb);
 585         }
 586         if (sd_element != NULL) {
 587                 sd_element->values[0] = *sd;
 588         } else {
 589                 ret = ldb_msg_add_steal_value(msg,
 590                                               "nTSecurityDescriptor",
 591                                               sd);
 592                 if (ret != LDB_SUCCESS) {
 593                         return ret;
 594                 }
 595         }
 596
 597         ret = ldb_build_add_req(&add_req, ldb, req,
 598                                 msg,
 599                                 req->controls,
 600                                 req, dsdb_next_callback,
 601                                 req);
 602         LDB_REQ_SET_LOCATION(add_req);
 603         if (ret != LDB_SUCCESS) {
 604                 return ldb_error(ldb, ret,
 605                                  "descriptor_add: Error creating new add request.");
 606         }
 607
 608         return ldb_next_request(module, add_req);
 609 }
 610
 611 static int descriptor_modify(struct ldb_module *module, struct ldb_request *req)
 612 {
 613         struct ldb_context *ldb = ldb_module_get_ctx(module);
 614         struct ldb_request *mod_req;
 615         struct ldb_message *msg;
 616         struct ldb_result *current_res, *parent_res;
 617         const struct ldb_val *old_sd = NULL;
 618         const struct ldb_val *parent_sd = NULL;
 619         const struct ldb_val *user_sd;
 620         struct ldb_dn *dn = req->op.mod.message->dn;
 621         struct ldb_dn *parent_dn;
 622         struct ldb_message_element *objectclass_element, *sd_element;
 623         int ret;
 624         uint32_t instanceType;
 625         uint32_t sd_flags = dsdb_request_sd_flags(req, NULL);
 626         const struct dsdb_schema *schema;
 627         DATA_BLOB *sd;
 628         const struct dsdb_class *objectclass;
 629         static const char * const parent_attrs[] = { "nTSecurityDescriptor", NULL };
 630         static const char * const current_attrs[] = { "nTSecurityDescriptor",
 631                                                       "instanceType",
 632                                                       "objectClass", NULL };
 633
 634         /* do not manipulate our control entries */
 635         if (ldb_dn_is_special(dn)) {
 636                 return ldb_next_request(module, req);
 637         }
 638
 639
 640         sd_element = ldb_msg_find_element(req->op.mod.message, "nTSecurityDescriptor");
 641         if (sd_element == NULL) {
 642                 return ldb_next_request(module, req);
 643         }
 644
 645         user_sd = ldb_msg_find_ldb_val(req->op.mod.message, "nTSecurityDescriptor");
 646         /* nTSecurityDescriptor without a value is an error, letting through so it is handled */
 647         if (user_sd == NULL) {
 648                 return ldb_next_request(module, req);
 649         }
 650
 651         ldb_debug(ldb, LDB_DEBUG_TRACE,"descriptor_modify: %s\n", ldb_dn_get_linearized(dn));
 652
 653         ret = dsdb_module_search_dn(module, req, &current_res, dn,
 654                                     current_attrs,
 655                                     DSDB_FLAG_NEXT_MODULE |
 656                                     DSDB_FLAG_AS_SYSTEM |
 657                                     DSDB_SEARCH_SHOW_RECYCLED,
 658                                     req);
 659         if (ret != LDB_SUCCESS) {
 660                 ldb_debug(ldb, LDB_DEBUG_ERROR,"descriptor_modify: Could not find %s\n",
 661                           ldb_dn_get_linearized(dn));
 662                 return ret;
 663         }
 664
 665         instanceType = ldb_msg_find_attr_as_uint(current_res->msgs[0],
 666                                                  "instanceType", 0);
 667         /* if the object has a parent, retrieve its SD to
 668          * use for calculation */
 669         if (!ldb_dn_is_null(current_res->msgs[0]->dn) &&
 670             !(instanceType & INSTANCE_TYPE_IS_NC_HEAD)) {
 671                 parent_dn = ldb_dn_get_parent(req, dn);
 672                 if (parent_dn == NULL) {
 673                         return ldb_oom(ldb);
 674                 }
 675                 ret = dsdb_module_search_dn(module, req, &parent_res, parent_dn,
 676                                             parent_attrs,
 677                                             DSDB_FLAG_NEXT_MODULE |
 678                                             DSDB_FLAG_AS_SYSTEM |
 679                                             DSDB_SEARCH_SHOW_RECYCLED,
 680                                             req);
 681                 if (ret != LDB_SUCCESS) {
 682                         ldb_debug(ldb, LDB_DEBUG_ERROR, "descriptor_modify: Could not find SD for %s\n",
 683                                   ldb_dn_get_linearized(parent_dn));
 684                         return ret;
 685                 }
 686                 if (parent_res->count != 1) {
 687                         return ldb_operr(ldb);
 688                 }
 689                 parent_sd = ldb_msg_find_ldb_val(parent_res->msgs[0], "nTSecurityDescriptor");
 690         }
 691
 692         schema = dsdb_get_schema(ldb, req);
 693
 694         objectclass_element = ldb_msg_find_element(current_res->msgs[0], "objectClass");
 695         if (objectclass_element == NULL) {
 696                 return ldb_operr(ldb);
 697         }
 698
 699         objectclass = dsdb_get_last_structural_class(schema,
 700                                                      objectclass_element);
 701         if (objectclass == NULL) {
 702                 return ldb_operr(ldb);
 703         }
 704
 705         old_sd = ldb_msg_find_ldb_val(current_res->msgs[0], "nTSecurityDescriptor");
 706
 707         sd = get_new_descriptor(module, dn, req,
 708                                 objectclass, parent_sd,
 709                                 user_sd, old_sd, sd_flags);
 710         if (sd == NULL) {
 711                 return ldb_operr(ldb);
 712         }
 713         msg = ldb_msg_copy_shallow(req, req->op.mod.message);
 714         if (msg == NULL) {
 715                 return ldb_oom(ldb);
 716         }
 717         sd_element->values[0] = *sd;
 718
 719         ret = ldb_build_mod_req(&mod_req, ldb, req,
 720                                 msg,
 721                                 req->controls,
 722                                 req,
 723                                 dsdb_next_callback,
 724                                 req);
 725         LDB_REQ_SET_LOCATION(mod_req);
 726         if (ret != LDB_SUCCESS) {
 727                 return ret;
 728         }
 729
 730         return ldb_next_request(module, mod_req);
 731 }
 732
 733 static int descriptor_search(struct ldb_module *module, struct ldb_request *req)
 734 {
 735         int ret;
 736         struct ldb_context *ldb;
 737         struct ldb_request *down_req;
 738         struct descriptor_context *ac;
 739         bool explicit_sd_flags = false;
 740         uint32_t sd_flags = dsdb_request_sd_flags(req, &explicit_sd_flags);
 741         bool show_sd = explicit_sd_flags;
 742
 743         if (!show_sd &&
 744             ldb_attr_in_list(req->op.search.attrs, "nTSecurityDescriptor"))
 745         {
 746                 show_sd = true;
 747         }
 748
 749         if (!show_sd) {
 750                 return ldb_next_request(module, req);
 751         }
 752
 753         ldb = ldb_module_get_ctx(module);
 754         ac = descriptor_init_context(module, req);
 755         if (ac == NULL) {
 756                 return ldb_operr(ldb);
 757         }
 758         ac->sd_flags = sd_flags;
 759
 760         ret = ldb_build_search_req_ex(&down_req, ldb, ac,
 761                                       req->op.search.base,
 762                                       req->op.search.scope,
 763                                       req->op.search.tree,
 764                                       req->op.search.attrs,
 765                                       req->controls,
 766                                       ac, descriptor_search_callback,
 767                                       ac->req);
 768         LDB_REQ_SET_LOCATION(down_req);
 769         if (ret != LDB_SUCCESS) {
 770                 return ret;
 771         }
 772
 773         return ldb_next_request(ac->module, down_req);
 774 }
 775 /* TODO */
 776 static int descriptor_rename(struct ldb_module *module, struct ldb_request *req)
 777 {
 778         struct ldb_context *ldb = ldb_module_get_ctx(module);
 779         struct ldb_dn *olddn = req->op.rename.olddn;
 780
 781         /* do not manipulate our control entries */
 782         if (ldb_dn_is_special(req->op.rename.olddn)) {
 783                 return ldb_next_request(module, req);
 784         }
 785
 786         ldb_debug(ldb, LDB_DEBUG_TRACE,"descriptor_rename: %s\n",
 787                   ldb_dn_get_linearized(olddn));
 788
 789         return ldb_next_request(module, req);
 790 }
 791
 792 static int descriptor_init(struct ldb_module *module)
 793 {
 794         int ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
 795         struct ldb_context *ldb = ldb_module_get_ctx(module);
 796         if (ret != LDB_SUCCESS) {
 797                 ldb_debug(ldb, LDB_DEBUG_ERROR,
 798                         "descriptor: Unable to register control with rootdse!\n");
 799                 return ldb_operr(ldb);
 800         }
 801         return ldb_next_init(module);
 802 }
 803
 804
 805 static const struct ldb_module_ops ldb_descriptor_module_ops = {
 806         .name          = "descriptor",
 807         .search        = descriptor_search,
 808         .add           = descriptor_add,
 809         .modify        = descriptor_modify,
 810         .rename        = descriptor_rename,
 811         .init_context  = descriptor_init
 812 };
 813
 814 int ldb_descriptor_module_init(const char *version)
 815 {
 816         LDB_MODULE_CHECK_VERSION(version);
 817         return ldb_register_module(&ldb_descriptor_module_ops);
 818 }