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