source4/dsdb/samdb/ldb_modules/acl.c

   1 /*
   2   ldb database library
   3
   4   Copyright (C) Simo Sorce 2006-2008
   5   Copyright (C) Nadezhda Ivanova 2009
   6   Copyright (C) Anatoliy Atanasov  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: ldb ACL module
  26  *
  27  *  Description: Module that performs authorisation access checks based on the
  28  *               account's security context and the DACL of the object being polled.
  29  *               Only DACL checks implemented at this point
  30  *
  31  *  Authors: Nadezhda Ivanova, Anatoliy Atanasov
  32  */
  33
  34 #include "includes.h"
  35 #include "ldb_module.h"
  36 #include "auth/auth.h"
  37 #include "libcli/security/security.h"
  38 #include "dsdb/samdb/samdb.h"
  39 #include "librpc/gen_ndr/ndr_security.h"
  40 #include "param/param.h"
  41 #include "dsdb/samdb/ldb_modules/util.h"
  42 #include "dsdb/samdb/ldb_modules/schema.h"
  43 #include "lib/util/tsort.h"
  44
  45 struct extended_access_check_attribute {
  46         const char *oa_name;
  47         const uint32_t requires_rights;
  48 };
  49
  50 struct acl_private {
  51         bool acl_perform;
  52         const char **password_attrs;
  53 };
  54
  55 struct acl_context {
  56         struct ldb_module *module;
  57         struct ldb_request *req;
  58         bool am_system;
  59         bool allowedAttributes;
  60         bool allowedAttributesEffective;
  61         bool allowedChildClasses;
  62         bool allowedChildClassesEffective;
  63         bool sDRightsEffective;
  64         const char * const *attrs;
  65         struct dsdb_schema *schema;
  66 };
  67
  68 static int acl_module_init(struct ldb_module *module)
  69 {
  70         struct ldb_context *ldb;
  71         struct acl_private *data;
  72         int ret, i;
  73         TALLOC_CTX *mem_ctx;
  74         static const char *attrs[] = { "passwordAttribute", NULL };
  75         struct ldb_result *res;
  76         struct ldb_message *msg;
  77         struct ldb_message_element *password_attributes;
  78
  79         ldb = ldb_module_get_ctx(module);
  80
  81         ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
  82         if (ret != LDB_SUCCESS) {
  83                 ldb_debug(ldb, LDB_DEBUG_ERROR,
  84                           "acl_module_init: Unable to register control with rootdse!\n");
  85                 return ldb_operr(ldb);
  86         }
  87
  88         data = talloc(module, struct acl_private);
  89         if (data == NULL) {
  90                 return ldb_oom(ldb);
  91         }
  92
  93         data->password_attrs = NULL;
  94         data->acl_perform = lpcfg_parm_bool(ldb_get_opaque(ldb, "loadparm"),
  95                                          NULL, "acl", "perform", false);
  96         ldb_module_set_private(module, data);
  97
  98         mem_ctx = talloc_new(module);
  99         if (!mem_ctx) {
 100                 return ldb_oom(ldb);
 101         }
 102
 103         ret = dsdb_module_search_dn(module, mem_ctx, &res,
 104                                     ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
 105                                     attrs,
 106                                     DSDB_FLAG_NEXT_MODULE);
 107         if (ret != LDB_SUCCESS) {
 108                 goto done;
 109         }
 110         if (res->count == 0) {
 111                 goto done;
 112         }
 113
 114         if (res->count > 1) {
 115                 talloc_free(mem_ctx);
 116                 return LDB_ERR_CONSTRAINT_VIOLATION;
 117         }
 118
 119         msg = res->msgs[0];
 120
 121         password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
 122         if (!password_attributes) {
 123                 goto done;
 124         }
 125         data->password_attrs = talloc_array(data, const char *, password_attributes->num_values + 1);
 126         if (!data->password_attrs) {
 127                 talloc_free(mem_ctx);
 128                 return ldb_oom(ldb);
 129         }
 130         for (i=0; i < password_attributes->num_values; i++) {
 131                 data->password_attrs[i] = (const char *)password_attributes->values[i].data;
 132                 talloc_steal(data->password_attrs, password_attributes->values[i].data);
 133         }
 134         data->password_attrs[i] = NULL;
 135
 136 done:
 137         talloc_free(mem_ctx);
 138         return ldb_next_init(module);
 139 }
 140
 141 static int acl_allowedAttributes(struct ldb_module *module,
 142                                  const struct dsdb_schema *schema,
 143                                  struct ldb_message *sd_msg,
 144                                  struct ldb_message *msg,
 145                                  struct acl_context *ac)
 146 {
 147         struct ldb_message_element *oc_el;
 148         struct ldb_context *ldb = ldb_module_get_ctx(module);
 149         TALLOC_CTX *mem_ctx;
 150         const char **attr_list;
 151         int i, ret;
 152
 153         /* If we don't have a schema yet, we can't do anything... */
 154         if (schema == NULL) {
 155                 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 156                 return LDB_ERR_OPERATIONS_ERROR;
 157         }
 158
 159         /* Must remove any existing attribute */
 160         if (ac->allowedAttributes) {
 161                 ldb_msg_remove_attr(msg, "allowedAttributes");
 162         }
 163
 164         mem_ctx = talloc_new(msg);
 165         if (!mem_ctx) {
 166                 return ldb_oom(ldb);
 167         }
 168
 169         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 170         attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
 171         if (!attr_list) {
 172                 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
 173                 talloc_free(mem_ctx);
 174                 return LDB_ERR_OPERATIONS_ERROR;
 175         }
 176         if (ac->allowedAttributes) {
 177                 for (i=0; attr_list && attr_list[i]; i++) {
 178                         ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
 179                 }
 180         }
 181         if (ac->allowedAttributesEffective) {
 182                 struct security_descriptor *sd;
 183                 struct dom_sid *sid = NULL;
 184                 struct ldb_control *as_system = ldb_request_get_control(ac->req,
 185                                                                         LDB_CONTROL_AS_SYSTEM_OID);
 186
 187                 if (as_system != NULL) {
 188                         as_system->critical = 0;
 189                 }
 190
 191                 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
 192                 if (ac->am_system || as_system) {
 193                         for (i=0; attr_list && attr_list[i]; i++) {
 194                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 195                         }
 196                         return LDB_SUCCESS;
 197                 }
 198
 199                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), mem_ctx, sd_msg, &sd);
 200
 201                 if (ret != LDB_SUCCESS) {
 202                         return ret;
 203                 }
 204
 205                 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
 206                 for (i=0; attr_list && attr_list[i]; i++) {
 207                         const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
 208                                                                                         attr_list[i]);
 209                         if (!attr) {
 210                                 return ldb_operr(ldb);
 211                         }
 212                         /* remove constructed attributes */
 213                         if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
 214                             || attr->systemOnly
 215                             || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
 216                                 continue;
 217                         }
 218                         ret = acl_check_access_on_attribute(module,
 219                                                             msg,
 220                                                             sd,
 221                                                             sid,
 222                                                             SEC_ADS_WRITE_PROP,
 223                                                             attr);
 224                         if (ret == LDB_SUCCESS) {
 225                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 226                         }
 227                 }
 228         }
 229         return LDB_SUCCESS;
 230 }
 231
 232 static int acl_childClasses(struct ldb_module *module,
 233                             const struct dsdb_schema *schema,
 234                             struct ldb_message *sd_msg,
 235                             struct ldb_message *msg,
 236                             const char *attrName)
 237 {
 238         struct ldb_message_element *oc_el;
 239         struct ldb_message_element *allowedClasses;
 240         const struct dsdb_class *sclass;
 241         unsigned int i, j;
 242         int ret;
 243
 244         /* If we don't have a schema yet, we can't do anything... */
 245         if (schema == NULL) {
 246                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 247                 return LDB_ERR_OPERATIONS_ERROR;
 248         }
 249
 250         /* Must remove any existing attribute, or else confusion reins */
 251         ldb_msg_remove_attr(msg, attrName);
 252         ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
 253         if (ret != LDB_SUCCESS) {
 254                 return ret;
 255         }
 256
 257         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 258
 259         for (i=0; oc_el && i < oc_el->num_values; i++) {
 260                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 261                 if (!sclass) {
 262                         /* We don't know this class?  what is going on? */
 263                         continue;
 264                 }
 265
 266                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 267                         ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
 268                 }
 269         }
 270         if (allowedClasses->num_values > 1) {
 271                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 272                 for (i=1 ; i < allowedClasses->num_values; i++) {
 273                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 274                         struct ldb_val *val2 = &allowedClasses->values[i];
 275                         if (data_blob_cmp(val1, val2) == 0) {
 276                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
 277                                 allowedClasses->num_values--;
 278                                 i--;
 279                         }
 280                 }
 281         }
 282
 283         return LDB_SUCCESS;
 284 }
 285
 286 static int acl_childClassesEffective(struct ldb_module *module,
 287                                      const struct dsdb_schema *schema,
 288                                      struct ldb_message *sd_msg,
 289                                      struct ldb_message *msg,
 290                                      struct acl_context *ac)
 291 {
 292         struct ldb_message_element *oc_el;
 293         struct ldb_message_element *allowedClasses = NULL;
 294         const struct dsdb_class *sclass;
 295         struct security_descriptor *sd;
 296         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 297                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 298         struct dom_sid *sid = NULL;
 299         unsigned int i, j;
 300         int ret;
 301
 302         if (as_system != NULL) {
 303                 as_system->critical = 0;
 304         }
 305
 306         if (ac->am_system || as_system) {
 307                 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
 308         }
 309
 310         /* If we don't have a schema yet, we can't do anything... */
 311         if (schema == NULL) {
 312                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 313                 return LDB_ERR_OPERATIONS_ERROR;
 314         }
 315
 316         /* Must remove any existing attribute, or else confusion reins */
 317         ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
 318
 319         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 320         ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 321         if (ret != LDB_SUCCESS) {
 322                 return ret;
 323         }
 324
 325         sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 326         for (i=0; oc_el && i < oc_el->num_values; i++) {
 327                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 328                 if (!sclass) {
 329                         /* We don't know this class?  what is going on? */
 330                         continue;
 331                 }
 332
 333                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 334                         ret = acl_check_access_on_class(module,
 335                                                         schema,
 336                                                         msg,
 337                                                         sd,
 338                                                         sid,
 339                                                         SEC_ADS_CREATE_CHILD,
 340                                                         sclass->possibleInferiors[j]);
 341                         if (ret == LDB_SUCCESS) {
 342                                 ldb_msg_add_string(msg, "allowedChildClassesEffective",
 343                                                    sclass->possibleInferiors[j]);
 344                         }
 345                 }
 346         }
 347         allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
 348         if (!allowedClasses) {
 349                 return LDB_SUCCESS;
 350         }
 351
 352         if (allowedClasses->num_values > 1) {
 353                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 354                 for (i=1 ; i < allowedClasses->num_values; i++) {
 355                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 356                         struct ldb_val *val2 = &allowedClasses->values[i];
 357                         if (data_blob_cmp(val1, val2) == 0) {
 358                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
 359                                 allowedClasses->num_values--;
 360                                 i--;
 361                         }
 362                 }
 363         }
 364         return LDB_SUCCESS;
 365 }
 366
 367 static int acl_sDRightsEffective(struct ldb_module *module,
 368                                  struct ldb_message *sd_msg,
 369                                  struct ldb_message *msg,
 370                                  struct acl_context *ac)
 371 {
 372         struct ldb_message_element *rightsEffective;
 373         int ret;
 374         struct security_descriptor *sd;
 375         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 376                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 377         struct dom_sid *sid = NULL;
 378         uint32_t flags = 0;
 379
 380         if (as_system != NULL) {
 381                 as_system->critical = 0;
 382         }
 383
 384         /* Must remove any existing attribute, or else confusion reins */
 385         ldb_msg_remove_attr(msg, "sDRightsEffective");
 386         ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
 387         if (ret != LDB_SUCCESS) {
 388                 return ret;
 389         }
 390         if (ac->am_system || as_system) {
 391                 flags = SECINFO_OWNER | SECINFO_GROUP |  SECINFO_SACL |  SECINFO_DACL;
 392         }
 393         else {
 394                 /* Get the security descriptor from the message */
 395                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 396                 if (ret != LDB_SUCCESS) {
 397                         return ret;
 398                 }
 399                 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 400                 ret = acl_check_access_on_attribute(module,
 401                                                     msg,
 402                                                     sd,
 403                                                     sid,
 404                                                     SEC_STD_WRITE_OWNER,
 405                                                     NULL);
 406                 if (ret == LDB_SUCCESS) {
 407                         flags |= SECINFO_OWNER | SECINFO_GROUP;
 408                 }
 409                 ret = acl_check_access_on_attribute(module,
 410                                                     msg,
 411                                                     sd,
 412                                                     sid,
 413                                                     SEC_STD_WRITE_DAC,
 414                                                     NULL);
 415                 if (ret == LDB_SUCCESS) {
 416                         flags |= SECINFO_DACL;
 417                 }
 418                 ret = acl_check_access_on_attribute(module,
 419                                                     msg,
 420                                                     sd,
 421                                                     sid,
 422                                                     SEC_FLAG_SYSTEM_SECURITY,
 423                                                     NULL);
 424                 if (ret == LDB_SUCCESS) {
 425                         flags |= SECINFO_SACL;
 426                 }
 427         }
 428         return samdb_msg_add_uint(ldb_module_get_ctx(module), msg, msg,
 429                                   "sDRightsEffective", flags);
 430 }
 431
 432 static int acl_add(struct ldb_module *module, struct ldb_request *req)
 433 {
 434         int ret;
 435         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
 436         struct ldb_context *ldb;
 437         const struct dsdb_schema *schema;
 438         struct ldb_message_element *oc_el;
 439         const struct GUID *guid;
 440         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 441
 442         if (as_system != NULL) {
 443                 as_system->critical = 0;
 444         }
 445
 446         if (dsdb_module_am_system(module) || as_system) {
 447                 return ldb_next_request(module, req);
 448         }
 449
 450         if (ldb_dn_is_special(req->op.add.message->dn)) {
 451                 return ldb_next_request(module, req);
 452         }
 453         ldb = ldb_module_get_ctx(module);
 454         /* Creating an NC. There is probably something we should do here,
 455          * but we will establish that later */
 456         /* FIXME: this has to be made dynamic at some point */
 457         if ((ldb_dn_compare(req->op.add.message->dn, (ldb_get_schema_basedn(ldb))) == 0) ||
 458             (ldb_dn_compare(req->op.add.message->dn, (ldb_get_config_basedn(ldb))) == 0) ||
 459             (ldb_dn_compare(req->op.add.message->dn, (ldb_get_default_basedn(ldb))) == 0)) {
 460                 return ldb_next_request(module, req);
 461         }
 462
 463         schema = dsdb_get_schema(ldb, req);
 464         if (!schema) {
 465                 return ldb_operr(ldb);
 466         }
 467
 468         oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
 469         if (!oc_el || oc_el->num_values == 0) {
 470                 DEBUG(10,("acl:operation error %s\n", ldb_dn_get_linearized(req->op.add.message->dn)));
 471                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 472         }
 473
 474         guid = class_schemaid_guid_by_lDAPDisplayName(schema,
 475                                                       (char *)oc_el->values[oc_el->num_values-1].data);
 476         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid);
 477         if (ret != LDB_SUCCESS) {
 478                 return ret;
 479         }
 480         return ldb_next_request(module, req);
 481 }
 482
 483 /* ckecks if modifications are allowed on "Member" attribute */
 484 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
 485                                      struct ldb_module *module,
 486                                      struct ldb_request *req,
 487                                      struct security_descriptor *sd,
 488                                      struct dom_sid *sid,
 489                                      const struct GUID *oc_guid,
 490                                      const struct dsdb_attribute *attr)
 491 {
 492         int ret;
 493         unsigned int i;
 494         struct ldb_context *ldb = ldb_module_get_ctx(module);
 495         struct ldb_dn *user_dn;
 496         struct ldb_message_element *member_el;
 497         /* if we have wp, we can do whatever we like */
 498         if (acl_check_access_on_attribute(module,
 499                                           mem_ctx,
 500                                           sd,
 501                                           sid,
 502                                           SEC_ADS_WRITE_PROP,
 503                                           attr) == LDB_SUCCESS) {
 504                 return LDB_SUCCESS;
 505         }
 506         /* if we are adding/deleting ourselves, check for self membership */
 507         ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
 508                                   &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
 509                                   &user_dn);
 510         if (ret != LDB_SUCCESS) {
 511                 return ret;
 512         }
 513         member_el = ldb_msg_find_element(req->op.mod.message, "member");
 514         if (!member_el) {
 515                 return ldb_operr(ldb);
 516         }
 517         /* user can only remove oneself */
 518         if (member_el->num_values == 0) {
 519                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 520         }
 521         for (i = 0; i < member_el->num_values; i++) {
 522                 if (strcasecmp((const char *)member_el->values[i].data,
 523                                ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
 524                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 525                 }
 526         }
 527         ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
 528                                        GUID_DRS_SELF_MEMBERSHIP,
 529                                        SEC_ADS_SELF_WRITE,
 530                                        sid);
 531         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 532                 dsdb_acl_debug(sd, acl_user_token(module),
 533                                req->op.mod.message->dn,
 534                                true,
 535                                10);
 536         }
 537         return ret;
 538 }
 539
 540 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
 541                                      struct ldb_module *module,
 542                                      struct ldb_request *req,
 543                                      struct security_descriptor *sd,
 544                                      struct dom_sid *sid,
 545                                      const struct GUID *oc_guid)
 546 {
 547         int ret = LDB_SUCCESS;
 548         unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
 549         struct ldb_message_element *el;
 550         struct ldb_message *msg;
 551         const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
 552                                         "unicodePwd", "dBCSPwd", NULL }, **l;
 553         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 554
 555         msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
 556         if (msg == NULL) {
 557                 return ldb_module_oom(module);
 558         }
 559         for (l = passwordAttrs; *l != NULL; l++) {
 560                 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
 561                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
 562                                 ++del_attr_cnt;
 563                         }
 564                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
 565                                 ++add_attr_cnt;
 566                         }
 567                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
 568                                 ++rep_attr_cnt;
 569                         }
 570                         ldb_msg_remove_element(msg, el);
 571                 }
 572         }
 573
 574         /* single deletes will be handled by the "password_hash" LDB module
 575          * later in the stack, so we let it though here */
 576         if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
 577                 talloc_free(tmp_ctx);
 578                 return LDB_SUCCESS;
 579         }
 580
 581         if (ldb_request_get_control(req,
 582                                     DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
 583                 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
 584                  * have a user password change and not a set as the message
 585                  * looks like. In it's value blob it contains the NT and/or LM
 586                  * hash of the old password specified by the user.
 587                  * This control is used by the SAMR and "kpasswd" password
 588                  * change mechanisms. */
 589                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 590                                                GUID_DRS_USER_CHANGE_PASSWORD,
 591                                                SEC_ADS_CONTROL_ACCESS,
 592                                                sid);
 593         }
 594         else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
 595                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 596                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
 597                                                SEC_ADS_CONTROL_ACCESS,
 598                                                sid);
 599         }
 600         else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
 601                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 602                                                GUID_DRS_USER_CHANGE_PASSWORD,
 603                                                SEC_ADS_CONTROL_ACCESS,
 604                                                sid);
 605                 /* Very strange, but we get constraint violation in this case */
 606                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 607                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
 608                 }
 609         }
 610         if (ret != LDB_SUCCESS) {
 611                 dsdb_acl_debug(sd, acl_user_token(module),
 612                                req->op.mod.message->dn,
 613                                true,
 614                                10);
 615         }
 616         talloc_free(tmp_ctx);
 617         return ret;
 618 }
 619
 620 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
 621 {
 622         int ret;
 623         struct ldb_context *ldb = ldb_module_get_ctx(module);
 624         const struct dsdb_schema *schema;
 625         unsigned int i;
 626         const struct GUID *guid;
 627         uint32_t access_granted;
 628         struct object_tree *root = NULL;
 629         struct object_tree *new_node = NULL;
 630         NTSTATUS status;
 631         struct ldb_result *acl_res;
 632         struct security_descriptor *sd;
 633         struct dom_sid *sid = NULL;
 634         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 635         TALLOC_CTX *tmp_ctx = talloc_new(req);
 636         static const char *acl_attrs[] = {
 637                 "nTSecurityDescriptor",
 638                 "objectClass",
 639                 "objectSid",
 640                 NULL
 641         };
 642
 643         if (as_system != NULL) {
 644                 as_system->critical = 0;
 645         }
 646
 647         /* Don't print this debug statement if elements[0].name is going to be NULL */
 648         if(req->op.mod.message->num_elements > 0)
 649         {
 650                 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
 651         }
 652         if (dsdb_module_am_system(module) || as_system) {
 653                 return ldb_next_request(module, req);
 654         }
 655         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 656                 return ldb_next_request(module, req);
 657         }
 658         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
 659                                     acl_attrs,
 660                                     DSDB_FLAG_NEXT_MODULE);
 661
 662         if (ret != LDB_SUCCESS) {
 663                 goto fail;
 664         }
 665
 666         schema = dsdb_get_schema(ldb, tmp_ctx);
 667         if (!schema) {
 668                 ret = LDB_ERR_OPERATIONS_ERROR;
 669                 goto fail;
 670         }
 671
 672         ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
 673         if (ret != LDB_SUCCESS) {
 674                 DEBUG(10, ("acl_modify: cannot get descriptor\n"));
 675                 goto fail;
 676         }
 677         /* Theoretically we pass the check if the object has no sd */
 678         if (!sd) {
 679                 goto success;
 680         }
 681
 682         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
 683         if (!guid) {
 684                 DEBUG(10, ("acl_modify: cannot get guid\n"));
 685                 goto fail;
 686         }
 687         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
 688         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 689                                    &root, &new_node)) {
 690                 DEBUG(10, ("acl_modify: cannot add to object tree\n"));
 691                 goto fail;
 692         }
 693         for (i=0; i < req->op.mod.message->num_elements; i++){
 694                 const struct dsdb_attribute *attr;
 695                 attr = dsdb_attribute_by_lDAPDisplayName(schema,
 696                                                                  req->op.mod.message->elements[i].name);
 697
 698                 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
 699                         status = sec_access_check_ds(sd, acl_user_token(module),
 700                                              SEC_STD_WRITE_DAC,
 701                                              &access_granted,
 702                                              NULL,
 703                                              sid);
 704
 705                         if (!NT_STATUS_IS_OK(status)) {
 706                                 DEBUG(10, ("Object %s has no write dacl access\n",
 707                                            ldb_dn_get_linearized(req->op.mod.message->dn)));
 708                                 dsdb_acl_debug(sd,
 709                                                acl_user_token(module),
 710                                                req->op.mod.message->dn,
 711                                                true,
 712                                                10);
 713                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 714                                 goto fail;
 715                         }
 716                 }
 717                 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
 718                         ret = acl_check_self_membership(tmp_ctx,
 719                                                         module,
 720                                                         req,
 721                                                         sd,
 722                                                         sid,
 723                                                         guid,
 724                                                         attr);
 725                         if (ret != LDB_SUCCESS) {
 726                                 goto fail;
 727                         }
 728                 }
 729                 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
 730                         /* this one is not affected by any rights, we should let it through
 731                            so that passwords_hash returns the correct error */
 732                         continue;
 733                 }
 734                 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
 735                          ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0 ||
 736                          ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
 737                         ret = acl_check_password_rights(tmp_ctx,
 738                                                         module,
 739                                                         req,
 740                                                         sd,
 741                                                         sid,
 742                                                         guid);
 743                         if (ret != LDB_SUCCESS) {
 744                                 goto fail;
 745                         }
 746                 } else {
 747
 748                 /* This basic attribute existence check with the right errorcode
 749                  * is needed since this module is the first one which requests
 750                  * schema attribute informations.
 751                  * The complete attribute checking is done in the
 752                  * "objectclass_attrs" module behind this one.
 753                  */
 754                         if (!attr) {
 755                                 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
 756                                                        req->op.mod.message->elements[i].name,
 757                                                ldb_dn_get_linearized(req->op.mod.message->dn));
 758                                 ret =  LDB_ERR_NO_SUCH_ATTRIBUTE;
 759                                 goto fail;
 760                         }
 761                         if (!insert_in_object_tree(tmp_ctx,
 762                                                    &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
 763                                                    &new_node, &new_node)) {
 764                                 DEBUG(10, ("acl_modify: cannot add to object tree securityGUID\n"));
 765                                 ret = LDB_ERR_OPERATIONS_ERROR;
 766                                 goto fail;
 767                         }
 768
 769                         if (!insert_in_object_tree(tmp_ctx,
 770                                                    &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
 771                                 DEBUG(10, ("acl_modify: cannot add to object tree attributeGUID\n"));
 772                                 ret = LDB_ERR_OPERATIONS_ERROR;
 773                                 goto fail;
 774                         }
 775                 }
 776         }
 777
 778         if (root->num_of_children > 0) {
 779                 status = sec_access_check_ds(sd, acl_user_token(module),
 780                                              SEC_ADS_WRITE_PROP,
 781                                              &access_granted,
 782                                              root,
 783                                              sid);
 784
 785                 if (!NT_STATUS_IS_OK(status)) {
 786                         DEBUG(10, ("Object %s has no write property access\n",
 787                                    ldb_dn_get_linearized(req->op.mod.message->dn)));
 788                         dsdb_acl_debug(sd,
 789                                   acl_user_token(module),
 790                                   req->op.mod.message->dn,
 791                                   true,
 792                                   10);
 793                         ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 794                         goto fail;
 795                 }
 796         }
 797
 798 success:
 799         talloc_free(tmp_ctx);
 800         return ldb_next_request(module, req);
 801 fail:
 802         talloc_free(tmp_ctx);
 803         return ret;
 804 }
 805
 806 /* similar to the modify for the time being.
 807  * We need to concider the special delete tree case, though - TODO */
 808 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
 809 {
 810         int ret;
 811         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
 812         struct ldb_context *ldb;
 813         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 814
 815         if (as_system != NULL) {
 816                 as_system->critical = 0;
 817         }
 818
 819         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
 820         if (dsdb_module_am_system(module) || as_system) {
 821                 return ldb_next_request(module, req);
 822         }
 823
 824         if (ldb_dn_is_special(req->op.del.dn)) {
 825                 return ldb_next_request(module, req);
 826         }
 827         ldb = ldb_module_get_ctx(module);
 828         /* first check if we have delete object right */
 829         ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn, SEC_STD_DELETE, NULL);
 830         if (ret == LDB_SUCCESS) {
 831                 return ldb_next_request(module, req);
 832         }
 833
 834         /* Nope, we don't have delete object. Lets check if we have delete child on the parent */
 835         /* No parent, so check fails */
 836         /* FIXME: this has to be made dynamic at some point */
 837         if ((ldb_dn_compare(req->op.del.dn, (ldb_get_schema_basedn(ldb))) == 0) ||
 838             (ldb_dn_compare(req->op.del.dn, (ldb_get_config_basedn(ldb))) == 0) ||
 839             (ldb_dn_compare(req->op.del.dn, (ldb_get_default_basedn(ldb))) == 0)) {
 840                 DEBUG(10,("acl:deleting an NC\n"));
 841                 return ldb_module_done(req, NULL, NULL, LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS);
 842         }
 843
 844         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_DELETE_CHILD, NULL);
 845         if (ret != LDB_SUCCESS) {
 846                 return ret;
 847         }
 848         return ldb_next_request(module, req);
 849 }
 850
 851 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
 852 {
 853         int ret;
 854         struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
 855         struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
 856         const struct dsdb_schema *schema;
 857         struct ldb_context *ldb;
 858         struct security_descriptor *sd = NULL;
 859         struct dom_sid *sid = NULL;
 860         struct ldb_result *acl_res;
 861         const struct GUID *guid;
 862         struct object_tree *root = NULL;
 863         struct object_tree *new_node = NULL;
 864         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 865         TALLOC_CTX *tmp_ctx = talloc_new(req);
 866         NTSTATUS status;
 867         uint32_t access_granted;
 868         const char *rdn_name;
 869         static const char *acl_attrs[] = {
 870                 "nTSecurityDescriptor",
 871                 "objectClass",
 872                 "objectSid",
 873                 NULL
 874         };
 875
 876         if (as_system != NULL) {
 877                 as_system->critical = 0;
 878         }
 879
 880         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
 881         if (dsdb_module_am_system(module) || as_system) {
 882                 return ldb_next_request(module, req);
 883         }
 884         if (ldb_dn_is_special(req->op.rename.olddn)) {
 885                 return ldb_next_request(module, req);
 886         }
 887         ldb = ldb_module_get_ctx(module);
 888
 889         ret = dsdb_module_search_dn(module, req, &acl_res, req->op.rename.olddn,
 890                                     acl_attrs,
 891                                     DSDB_FLAG_NEXT_MODULE |
 892                                     DSDB_SEARCH_SHOW_RECYCLED);
 893         /* we sould be able to find the parent */
 894         if (ret != LDB_SUCCESS) {
 895                 DEBUG(10,("acl: failed to find object %s\n",
 896                           ldb_dn_get_linearized(req->op.rename.olddn)));
 897                 return ret;
 898         }
 899
 900         schema = dsdb_get_schema(ldb, acl_res);
 901         if (!schema) {
 902                 talloc_free(acl_res);
 903                 return ldb_operr(ldb);
 904         }
 905
 906         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
 907         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 908                                    &root, &new_node)) {
 909                 return ldb_operr(ldb);
 910         };
 911
 912         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
 913                                                           "name");
 914         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 915                                    &new_node, &new_node)) {
 916                 return ldb_operr(ldb);
 917         };
 918
 919         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
 920         if (rdn_name == NULL) {
 921                 return ldb_operr(ldb);
 922         }
 923         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
 924                                                           rdn_name);
 925         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 926                                    &new_node, &new_node)) {
 927                 return ldb_operr(ldb);
 928         };
 929
 930         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
 931
 932         if (ret != LDB_SUCCESS) {
 933                 return ldb_operr(ldb);
 934         }
 935         /* Theoretically we pass the check if the object has no sd */
 936         if (!sd) {
 937                 return LDB_SUCCESS;
 938         }
 939         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
 940         status = sec_access_check_ds(sd, acl_user_token(module),
 941                                      SEC_ADS_WRITE_PROP,
 942                                      &access_granted,
 943                                      root,
 944                                      sid);
 945
 946         if (!NT_STATUS_IS_OK(status)) {
 947                 DEBUG(10, ("Object %s has no wp on name\n",
 948                            ldb_dn_get_linearized(req->op.rename.olddn)));
 949                 dsdb_acl_debug(sd,
 950                           acl_user_token(module),
 951                           req->op.rename.olddn,
 952                           true,
 953                           10);
 954                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 955         }
 956
 957         if (ldb_dn_compare(oldparent, newparent) == 0) {
 958                 /* regular rename, not move, nothing more to do */
 959                 return ldb_next_request(module, req);
 960         }
 961
 962         /* What exactly to do in this case? It would fail anyway.. */
 963         /* FIXME: this has to be made dynamic at some point */
 964         if ((ldb_dn_compare(req->op.rename.newdn, (ldb_get_schema_basedn(ldb))) == 0) ||
 965             (ldb_dn_compare(req->op.rename.newdn, (ldb_get_config_basedn(ldb))) == 0) ||
 966             (ldb_dn_compare(req->op.rename.newdn, (ldb_get_default_basedn(ldb))) == 0)) {
 967                 DEBUG(10,("acl:moving as an NC\n"));
 968                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 969         }
 970         /* new parent should have create child */
 971         talloc_free(tmp_ctx);
 972         tmp_ctx = talloc_new(req);
 973         root = NULL;
 974         new_node = NULL;
 975         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
 976         if (!guid) {
 977                 DEBUG(10,("acl:renamed object has no object class\n"));
 978                 return ldb_module_done(req, NULL, NULL,  LDB_ERR_OPERATIONS_ERROR);
 979         }
 980
 981         ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid);
 982         if (ret != LDB_SUCCESS) {
 983                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
 984                 return ret;
 985         }
 986         /* do we have delete object on the object? */
 987
 988         status = sec_access_check_ds(sd, acl_user_token(module),
 989                                      SEC_STD_DELETE,
 990                                      &access_granted,
 991                                      NULL,
 992                                      sid);
 993
 994         if (NT_STATUS_IS_OK(status)) {
 995                 return ldb_next_request(module, req);
 996         }
 997         /* what about delete child on the current parent */
 998         ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL);
 999         if (ret != LDB_SUCCESS) {
1000                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1001                 return ldb_module_done(req, NULL, NULL, ret);
1002         }
1003         return ldb_next_request(module, req);
1004 }
1005
1006 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1007 {
1008         struct ldb_context *ldb;
1009         struct acl_context *ac;
1010         struct acl_private *data;
1011         struct ldb_result *acl_res;
1012         static const char *acl_attrs[] = {
1013                 "objectClass",
1014                 "nTSecurityDescriptor",
1015                 "objectSid",
1016                 NULL
1017         };
1018         int ret, i;
1019
1020         ac = talloc_get_type(req->context, struct acl_context);
1021         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1022         ldb = ldb_module_get_ctx(ac->module);
1023
1024         if (!ares) {
1025                 return ldb_module_done(ac->req, NULL, NULL,
1026                                        LDB_ERR_OPERATIONS_ERROR);
1027         }
1028         if (ares->error != LDB_SUCCESS) {
1029                 return ldb_module_done(ac->req, ares->controls,
1030                                        ares->response, ares->error);
1031         }
1032
1033         switch (ares->type) {
1034         case LDB_REPLY_ENTRY:
1035                 if (ac->allowedAttributes
1036                     || ac->allowedChildClasses
1037                     || ac->allowedChildClassesEffective
1038                     || ac->allowedAttributesEffective
1039                     || ac->sDRightsEffective) {
1040                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1041                                                     acl_attrs,
1042                                                     DSDB_FLAG_NEXT_MODULE);
1043                         if (ret != LDB_SUCCESS) {
1044                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1045                         }
1046                         if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1047                                 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1048                                 if (ret != LDB_SUCCESS) {
1049                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1050                                 }
1051                         }
1052                         if (ac->allowedChildClasses) {
1053                                 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1054                                                        ares->message, "allowedChildClasses");
1055                                 if (ret != LDB_SUCCESS) {
1056                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1057                                 }
1058                         }
1059                         if (ac->allowedChildClassesEffective) {
1060                                 ret = acl_childClassesEffective(ac->module, ac->schema,
1061                                                                 acl_res->msgs[0], ares->message, ac);
1062                                 if (ret != LDB_SUCCESS) {
1063                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1064                                 }
1065                         }
1066                         if (ac->sDRightsEffective) {
1067                                 ret = acl_sDRightsEffective(ac->module,
1068                                                             acl_res->msgs[0], ares->message, ac);
1069                                 if (ret != LDB_SUCCESS) {
1070                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1071                                 }
1072                         }
1073                 }
1074                 if (data && data->password_attrs) {
1075                         if (!ac->am_system) {
1076                                 for (i = 0; data->password_attrs[i]; i++) {
1077                                         ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1078                                 }
1079                         }
1080                 }
1081                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1082
1083         case LDB_REPLY_REFERRAL:
1084                 return ldb_module_send_referral(ac->req, ares->referral);
1085
1086         case LDB_REPLY_DONE:
1087                 return ldb_module_done(ac->req, ares->controls,
1088                                        ares->response, LDB_SUCCESS);
1089
1090         }
1091         return LDB_SUCCESS;
1092 }
1093
1094 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1095 {
1096         struct ldb_context *ldb;
1097         struct acl_context *ac;
1098         struct ldb_request *down_req;
1099         struct acl_private *data;
1100         int ret, i;
1101
1102         ldb = ldb_module_get_ctx(module);
1103
1104         ac = talloc_zero(req, struct acl_context);
1105         if (ac == NULL) {
1106                 return ldb_oom(ldb);
1107         }
1108         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1109
1110         ac->module = module;
1111         ac->req = req;
1112         ac->am_system = dsdb_module_am_system(module);
1113         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1114         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1115         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1116         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1117         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1118         ac->schema = dsdb_get_schema(ldb, ac);
1119
1120         /* replace any attributes in the parse tree that are private,
1121            so we don't allow a search for 'userPassword=penguin',
1122            just as we would not allow that attribute to be returned */
1123         if (ac->am_system) {
1124                 /* FIXME: We should copy the tree and keep the original unmodified. */
1125                 /* remove password attributes */
1126                 if (data && data->password_attrs) {
1127                         for (i = 0; data->password_attrs[i]; i++) {
1128                                 ldb_parse_tree_attr_replace(req->op.search.tree,
1129                                                             data->password_attrs[i],
1130                                                             "kludgeACLredactedattribute");
1131                         }
1132                 }
1133         }
1134         ret = ldb_build_search_req_ex(&down_req,
1135                                       ldb, ac,
1136                                       req->op.search.base,
1137                                       req->op.search.scope,
1138                                       req->op.search.tree,
1139                                       req->op.search.attrs,
1140                                       req->controls,
1141                                       ac, acl_search_callback,
1142                                       req);
1143         LDB_REQ_SET_LOCATION(down_req);
1144         if (ret != LDB_SUCCESS) {
1145                 return ret;
1146         }
1147         /* perform the search */
1148         return ldb_next_request(module, down_req);
1149 }
1150
1151 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1152 {
1153         struct ldb_context *ldb = ldb_module_get_ctx(module);
1154         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1155
1156         /* allow everybody to read the sequence number */
1157         if (strcmp(req->op.extended.oid,
1158                    LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1159                 return ldb_next_request(module, req);
1160         }
1161
1162         if (dsdb_module_am_system(module) ||
1163             dsdb_module_am_administrator(module) || as_system) {
1164                 return ldb_next_request(module, req);
1165         } else {
1166                 ldb_asprintf_errstring(ldb,
1167                                        "acl_extended: "
1168                                        "attempted database modify not permitted. "
1169                                        "User %s is not SYSTEM or an administrator",
1170                                        acl_user_name(req, module));
1171                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1172         }
1173 }
1174
1175 static const struct ldb_module_ops ldb_acl_module_ops = {
1176         .name              = "acl",
1177         .search            = acl_search,
1178         .add               = acl_add,
1179         .modify            = acl_modify,
1180         .del               = acl_delete,
1181         .rename            = acl_rename,
1182         .extended          = acl_extended,
1183         .init_context      = acl_module_init
1184 };
1185
1186 int ldb_acl_module_init(const char *version)
1187 {
1188         LDB_MODULE_CHECK_VERSION(version);
1189         return ldb_register_module(&ldb_acl_module_ops);
1190 }