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         bool userPassword;
  65         const char * const *attrs;
  66         struct dsdb_schema *schema;
  67 };
  68
  69 static int acl_module_init(struct ldb_module *module)
  70 {
  71         struct ldb_context *ldb;
  72         struct acl_private *data;
  73         int ret, i;
  74         TALLOC_CTX *mem_ctx;
  75         static const char *attrs[] = { "passwordAttribute", NULL };
  76         struct ldb_result *res;
  77         struct ldb_message *msg;
  78         struct ldb_message_element *password_attributes;
  79
  80         ldb = ldb_module_get_ctx(module);
  81
  82         ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
  83         if (ret != LDB_SUCCESS) {
  84                 ldb_debug(ldb, LDB_DEBUG_ERROR,
  85                           "acl_module_init: Unable to register control with rootdse!\n");
  86                 return ldb_operr(ldb);
  87         }
  88
  89         data = talloc(module, struct acl_private);
  90         if (data == NULL) {
  91                 return ldb_oom(ldb);
  92         }
  93
  94         data->password_attrs = NULL;
  95         data->acl_perform = lpcfg_parm_bool(ldb_get_opaque(ldb, "loadparm"),
  96                                          NULL, "acl", "perform", false);
  97         ldb_module_set_private(module, data);
  98
  99         mem_ctx = talloc_new(module);
 100         if (!mem_ctx) {
 101                 return ldb_oom(ldb);
 102         }
 103
 104         ret = dsdb_module_search_dn(module, mem_ctx, &res,
 105                                     ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
 106                                     attrs,
 107                                     DSDB_FLAG_NEXT_MODULE);
 108         if (ret != LDB_SUCCESS) {
 109                 goto done;
 110         }
 111         if (res->count == 0) {
 112                 goto done;
 113         }
 114
 115         if (res->count > 1) {
 116                 talloc_free(mem_ctx);
 117                 return LDB_ERR_CONSTRAINT_VIOLATION;
 118         }
 119
 120         msg = res->msgs[0];
 121
 122         password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
 123         if (!password_attributes) {
 124                 goto done;
 125         }
 126         data->password_attrs = talloc_array(data, const char *, password_attributes->num_values + 1);
 127         if (!data->password_attrs) {
 128                 talloc_free(mem_ctx);
 129                 return ldb_oom(ldb);
 130         }
 131         for (i=0; i < password_attributes->num_values; i++) {
 132                 data->password_attrs[i] = (const char *)password_attributes->values[i].data;
 133                 talloc_steal(data->password_attrs, password_attributes->values[i].data);
 134         }
 135         data->password_attrs[i] = NULL;
 136
 137 done:
 138         talloc_free(mem_ctx);
 139         return ldb_next_init(module);
 140 }
 141
 142 static int acl_allowedAttributes(struct ldb_module *module,
 143                                  const struct dsdb_schema *schema,
 144                                  struct ldb_message *sd_msg,
 145                                  struct ldb_message *msg,
 146                                  struct acl_context *ac)
 147 {
 148         struct ldb_message_element *oc_el;
 149         struct ldb_context *ldb = ldb_module_get_ctx(module);
 150         TALLOC_CTX *mem_ctx;
 151         const char **attr_list;
 152         int i, ret;
 153
 154         /* If we don't have a schema yet, we can't do anything... */
 155         if (schema == NULL) {
 156                 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 157                 return LDB_ERR_OPERATIONS_ERROR;
 158         }
 159
 160         /* Must remove any existing attribute */
 161         if (ac->allowedAttributes) {
 162                 ldb_msg_remove_attr(msg, "allowedAttributes");
 163         }
 164
 165         mem_ctx = talloc_new(msg);
 166         if (!mem_ctx) {
 167                 return ldb_oom(ldb);
 168         }
 169
 170         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 171         attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
 172         if (!attr_list) {
 173                 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
 174                 talloc_free(mem_ctx);
 175                 return LDB_ERR_OPERATIONS_ERROR;
 176         }
 177         if (ac->allowedAttributes) {
 178                 for (i=0; attr_list && attr_list[i]; i++) {
 179                         ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
 180                 }
 181         }
 182         if (ac->allowedAttributesEffective) {
 183                 struct security_descriptor *sd;
 184                 struct dom_sid *sid = NULL;
 185                 struct ldb_control *as_system = ldb_request_get_control(ac->req,
 186                                                                         LDB_CONTROL_AS_SYSTEM_OID);
 187
 188                 if (as_system != NULL) {
 189                         as_system->critical = 0;
 190                 }
 191
 192                 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
 193                 if (ac->am_system || as_system) {
 194                         for (i=0; attr_list && attr_list[i]; i++) {
 195                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 196                         }
 197                         return LDB_SUCCESS;
 198                 }
 199
 200                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), mem_ctx, sd_msg, &sd);
 201
 202                 if (ret != LDB_SUCCESS) {
 203                         return ret;
 204                 }
 205
 206                 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
 207                 for (i=0; attr_list && attr_list[i]; i++) {
 208                         const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
 209                                                                                         attr_list[i]);
 210                         if (!attr) {
 211                                 return ldb_operr(ldb);
 212                         }
 213                         /* remove constructed attributes */
 214                         if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
 215                             || attr->systemOnly
 216                             || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
 217                                 continue;
 218                         }
 219                         ret = acl_check_access_on_attribute(module,
 220                                                             msg,
 221                                                             sd,
 222                                                             sid,
 223                                                             SEC_ADS_WRITE_PROP,
 224                                                             attr);
 225                         if (ret == LDB_SUCCESS) {
 226                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 227                         }
 228                 }
 229         }
 230         return LDB_SUCCESS;
 231 }
 232
 233 static int acl_childClasses(struct ldb_module *module,
 234                             const struct dsdb_schema *schema,
 235                             struct ldb_message *sd_msg,
 236                             struct ldb_message *msg,
 237                             const char *attrName)
 238 {
 239         struct ldb_message_element *oc_el;
 240         struct ldb_message_element *allowedClasses;
 241         const struct dsdb_class *sclass;
 242         unsigned int i, j;
 243         int ret;
 244
 245         /* If we don't have a schema yet, we can't do anything... */
 246         if (schema == NULL) {
 247                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 248                 return LDB_ERR_OPERATIONS_ERROR;
 249         }
 250
 251         /* Must remove any existing attribute, or else confusion reins */
 252         ldb_msg_remove_attr(msg, attrName);
 253         ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
 254         if (ret != LDB_SUCCESS) {
 255                 return ret;
 256         }
 257
 258         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 259
 260         for (i=0; oc_el && i < oc_el->num_values; i++) {
 261                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 262                 if (!sclass) {
 263                         /* We don't know this class?  what is going on? */
 264                         continue;
 265                 }
 266
 267                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 268                         ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
 269                 }
 270         }
 271         if (allowedClasses->num_values > 1) {
 272                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 273                 for (i=1 ; i < allowedClasses->num_values; i++) {
 274                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 275                         struct ldb_val *val2 = &allowedClasses->values[i];
 276                         if (data_blob_cmp(val1, val2) == 0) {
 277                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
 278                                 allowedClasses->num_values--;
 279                                 i--;
 280                         }
 281                 }
 282         }
 283
 284         return LDB_SUCCESS;
 285 }
 286
 287 static int acl_childClassesEffective(struct ldb_module *module,
 288                                      const struct dsdb_schema *schema,
 289                                      struct ldb_message *sd_msg,
 290                                      struct ldb_message *msg,
 291                                      struct acl_context *ac)
 292 {
 293         struct ldb_message_element *oc_el;
 294         struct ldb_message_element *allowedClasses = NULL;
 295         const struct dsdb_class *sclass;
 296         struct security_descriptor *sd;
 297         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 298                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 299         struct dom_sid *sid = NULL;
 300         unsigned int i, j;
 301         int ret;
 302
 303         if (as_system != NULL) {
 304                 as_system->critical = 0;
 305         }
 306
 307         if (ac->am_system || as_system) {
 308                 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
 309         }
 310
 311         /* If we don't have a schema yet, we can't do anything... */
 312         if (schema == NULL) {
 313                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 314                 return LDB_ERR_OPERATIONS_ERROR;
 315         }
 316
 317         /* Must remove any existing attribute, or else confusion reins */
 318         ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
 319
 320         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 321         ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 322         if (ret != LDB_SUCCESS) {
 323                 return ret;
 324         }
 325
 326         sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 327         for (i=0; oc_el && i < oc_el->num_values; i++) {
 328                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 329                 if (!sclass) {
 330                         /* We don't know this class?  what is going on? */
 331                         continue;
 332                 }
 333
 334                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 335                         ret = acl_check_access_on_class(module,
 336                                                         schema,
 337                                                         msg,
 338                                                         sd,
 339                                                         sid,
 340                                                         SEC_ADS_CREATE_CHILD,
 341                                                         sclass->possibleInferiors[j]);
 342                         if (ret == LDB_SUCCESS) {
 343                                 ldb_msg_add_string(msg, "allowedChildClassesEffective",
 344                                                    sclass->possibleInferiors[j]);
 345                         }
 346                 }
 347         }
 348         allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
 349         if (!allowedClasses) {
 350                 return LDB_SUCCESS;
 351         }
 352
 353         if (allowedClasses->num_values > 1) {
 354                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 355                 for (i=1 ; i < allowedClasses->num_values; i++) {
 356                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 357                         struct ldb_val *val2 = &allowedClasses->values[i];
 358                         if (data_blob_cmp(val1, val2) == 0) {
 359                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
 360                                 allowedClasses->num_values--;
 361                                 i--;
 362                         }
 363                 }
 364         }
 365         return LDB_SUCCESS;
 366 }
 367
 368 static int acl_sDRightsEffective(struct ldb_module *module,
 369                                  struct ldb_message *sd_msg,
 370                                  struct ldb_message *msg,
 371                                  struct acl_context *ac)
 372 {
 373         struct ldb_message_element *rightsEffective;
 374         int ret;
 375         struct security_descriptor *sd;
 376         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 377                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 378         struct dom_sid *sid = NULL;
 379         uint32_t flags = 0;
 380
 381         if (as_system != NULL) {
 382                 as_system->critical = 0;
 383         }
 384
 385         /* Must remove any existing attribute, or else confusion reins */
 386         ldb_msg_remove_attr(msg, "sDRightsEffective");
 387         ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
 388         if (ret != LDB_SUCCESS) {
 389                 return ret;
 390         }
 391         if (ac->am_system || as_system) {
 392                 flags = SECINFO_OWNER | SECINFO_GROUP |  SECINFO_SACL |  SECINFO_DACL;
 393         }
 394         else {
 395                 /* Get the security descriptor from the message */
 396                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 397                 if (ret != LDB_SUCCESS) {
 398                         return ret;
 399                 }
 400                 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 401                 ret = acl_check_access_on_attribute(module,
 402                                                     msg,
 403                                                     sd,
 404                                                     sid,
 405                                                     SEC_STD_WRITE_OWNER,
 406                                                     NULL);
 407                 if (ret == LDB_SUCCESS) {
 408                         flags |= SECINFO_OWNER | SECINFO_GROUP;
 409                 }
 410                 ret = acl_check_access_on_attribute(module,
 411                                                     msg,
 412                                                     sd,
 413                                                     sid,
 414                                                     SEC_STD_WRITE_DAC,
 415                                                     NULL);
 416                 if (ret == LDB_SUCCESS) {
 417                         flags |= SECINFO_DACL;
 418                 }
 419                 ret = acl_check_access_on_attribute(module,
 420                                                     msg,
 421                                                     sd,
 422                                                     sid,
 423                                                     SEC_FLAG_SYSTEM_SECURITY,
 424                                                     NULL);
 425                 if (ret == LDB_SUCCESS) {
 426                         flags |= SECINFO_SACL;
 427                 }
 428         }
 429         return samdb_msg_add_uint(ldb_module_get_ctx(module), msg, msg,
 430                                   "sDRightsEffective", flags);
 431 }
 432
 433 static int acl_add(struct ldb_module *module, struct ldb_request *req)
 434 {
 435         int ret;
 436         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
 437         struct ldb_context *ldb;
 438         const struct dsdb_schema *schema;
 439         struct ldb_message_element *oc_el;
 440         const struct GUID *guid;
 441         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 442
 443         if (as_system != NULL) {
 444                 as_system->critical = 0;
 445         }
 446
 447         if (dsdb_module_am_system(module) || as_system) {
 448                 return ldb_next_request(module, req);
 449         }
 450
 451         if (ldb_dn_is_special(req->op.add.message->dn)) {
 452                 return ldb_next_request(module, req);
 453         }
 454         ldb = ldb_module_get_ctx(module);
 455         /* Creating an NC. There is probably something we should do here,
 456          * but we will establish that later */
 457         /* FIXME: this has to be made dynamic at some point */
 458         if ((ldb_dn_compare(req->op.add.message->dn, (ldb_get_schema_basedn(ldb))) == 0) ||
 459             (ldb_dn_compare(req->op.add.message->dn, (ldb_get_config_basedn(ldb))) == 0) ||
 460             (ldb_dn_compare(req->op.add.message->dn, (ldb_get_default_basedn(ldb))) == 0)) {
 461                 return ldb_next_request(module, req);
 462         }
 463
 464         schema = dsdb_get_schema(ldb, req);
 465         if (!schema) {
 466                 return ldb_operr(ldb);
 467         }
 468
 469         oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
 470         if (!oc_el || oc_el->num_values == 0) {
 471                 DEBUG(10,("acl:operation error %s\n", ldb_dn_get_linearized(req->op.add.message->dn)));
 472                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 473         }
 474
 475         guid = class_schemaid_guid_by_lDAPDisplayName(schema,
 476                                                       (char *)oc_el->values[oc_el->num_values-1].data);
 477         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid);
 478         if (ret != LDB_SUCCESS) {
 479                 return ret;
 480         }
 481         return ldb_next_request(module, req);
 482 }
 483
 484 /* ckecks if modifications are allowed on "Member" attribute */
 485 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
 486                                      struct ldb_module *module,
 487                                      struct ldb_request *req,
 488                                      struct security_descriptor *sd,
 489                                      struct dom_sid *sid,
 490                                      const struct GUID *oc_guid,
 491                                      const struct dsdb_attribute *attr)
 492 {
 493         int ret;
 494         unsigned int i;
 495         struct ldb_context *ldb = ldb_module_get_ctx(module);
 496         struct ldb_dn *user_dn;
 497         struct ldb_message_element *member_el;
 498         /* if we have wp, we can do whatever we like */
 499         if (acl_check_access_on_attribute(module,
 500                                           mem_ctx,
 501                                           sd,
 502                                           sid,
 503                                           SEC_ADS_WRITE_PROP,
 504                                           attr) == LDB_SUCCESS) {
 505                 return LDB_SUCCESS;
 506         }
 507         /* if we are adding/deleting ourselves, check for self membership */
 508         ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
 509                                   &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
 510                                   &user_dn);
 511         if (ret != LDB_SUCCESS) {
 512                 return ret;
 513         }
 514         member_el = ldb_msg_find_element(req->op.mod.message, "member");
 515         if (!member_el) {
 516                 return ldb_operr(ldb);
 517         }
 518         /* user can only remove oneself */
 519         if (member_el->num_values == 0) {
 520                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 521         }
 522         for (i = 0; i < member_el->num_values; i++) {
 523                 if (strcasecmp((const char *)member_el->values[i].data,
 524                                ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
 525                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 526                 }
 527         }
 528         ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
 529                                        GUID_DRS_SELF_MEMBERSHIP,
 530                                        SEC_ADS_SELF_WRITE,
 531                                        sid);
 532         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 533                 dsdb_acl_debug(sd, acl_user_token(module),
 534                                req->op.mod.message->dn,
 535                                true,
 536                                10);
 537         }
 538         return ret;
 539 }
 540
 541 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
 542                                      struct ldb_module *module,
 543                                      struct ldb_request *req,
 544                                      struct security_descriptor *sd,
 545                                      struct dom_sid *sid,
 546                                      const struct GUID *oc_guid,
 547                                      bool userPassword)
 548 {
 549         int ret = LDB_SUCCESS;
 550         unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
 551         struct ldb_message_element *el;
 552         struct ldb_message *msg;
 553         const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
 554                                         "unicodePwd", "dBCSPwd", NULL }, **l;
 555         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 556
 557         msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
 558         if (msg == NULL) {
 559                 return ldb_module_oom(module);
 560         }
 561         for (l = passwordAttrs; *l != NULL; l++) {
 562                 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
 563                         continue;
 564                 }
 565
 566                 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
 567                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
 568                                 ++del_attr_cnt;
 569                         }
 570                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
 571                                 ++add_attr_cnt;
 572                         }
 573                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
 574                                 ++rep_attr_cnt;
 575                         }
 576                         ldb_msg_remove_element(msg, el);
 577                 }
 578         }
 579
 580         /* single deletes will be handled by the "password_hash" LDB module
 581          * later in the stack, so we let it though here */
 582         if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
 583                 talloc_free(tmp_ctx);
 584                 return LDB_SUCCESS;
 585         }
 586
 587         if (ldb_request_get_control(req,
 588                                     DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
 589                 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
 590                  * have a user password change and not a set as the message
 591                  * looks like. In it's value blob it contains the NT and/or LM
 592                  * hash of the old password specified by the user.
 593                  * This control is used by the SAMR and "kpasswd" password
 594                  * change mechanisms. */
 595                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 596                                                GUID_DRS_USER_CHANGE_PASSWORD,
 597                                                SEC_ADS_CONTROL_ACCESS,
 598                                                sid);
 599         }
 600         else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
 601                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 602                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
 603                                                SEC_ADS_CONTROL_ACCESS,
 604                                                sid);
 605         }
 606         else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
 607                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 608                                                GUID_DRS_USER_CHANGE_PASSWORD,
 609                                                SEC_ADS_CONTROL_ACCESS,
 610                                                sid);
 611                 /* Very strange, but we get constraint violation in this case */
 612                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 613                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
 614                 }
 615         }
 616         if (ret != LDB_SUCCESS) {
 617                 dsdb_acl_debug(sd, acl_user_token(module),
 618                                req->op.mod.message->dn,
 619                                true,
 620                                10);
 621         }
 622         talloc_free(tmp_ctx);
 623         return ret;
 624 }
 625
 626 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
 627 {
 628         int ret;
 629         struct ldb_context *ldb = ldb_module_get_ctx(module);
 630         const struct dsdb_schema *schema;
 631         unsigned int i;
 632         const struct GUID *guid;
 633         uint32_t access_granted;
 634         struct object_tree *root = NULL;
 635         struct object_tree *new_node = NULL;
 636         NTSTATUS status;
 637         struct ldb_result *acl_res;
 638         struct security_descriptor *sd;
 639         struct dom_sid *sid = NULL;
 640         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 641         bool userPassword = dsdb_user_password_support(module, req);
 642         TALLOC_CTX *tmp_ctx = talloc_new(req);
 643         static const char *acl_attrs[] = {
 644                 "nTSecurityDescriptor",
 645                 "objectClass",
 646                 "objectSid",
 647                 NULL
 648         };
 649
 650         if (as_system != NULL) {
 651                 as_system->critical = 0;
 652         }
 653
 654         /* Don't print this debug statement if elements[0].name is going to be NULL */
 655         if(req->op.mod.message->num_elements > 0)
 656         {
 657                 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
 658         }
 659         if (dsdb_module_am_system(module) || as_system) {
 660                 return ldb_next_request(module, req);
 661         }
 662         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 663                 return ldb_next_request(module, req);
 664         }
 665         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
 666                                     acl_attrs,
 667                                     DSDB_FLAG_NEXT_MODULE);
 668
 669         if (ret != LDB_SUCCESS) {
 670                 goto fail;
 671         }
 672
 673         schema = dsdb_get_schema(ldb, tmp_ctx);
 674         if (!schema) {
 675                 ret = LDB_ERR_OPERATIONS_ERROR;
 676                 goto fail;
 677         }
 678
 679         ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
 680         if (ret != LDB_SUCCESS) {
 681                 DEBUG(10, ("acl_modify: cannot get descriptor\n"));
 682                 goto fail;
 683         }
 684         /* Theoretically we pass the check if the object has no sd */
 685         if (!sd) {
 686                 goto success;
 687         }
 688
 689         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
 690         if (!guid) {
 691                 DEBUG(10, ("acl_modify: cannot get guid\n"));
 692                 goto fail;
 693         }
 694         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
 695         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 696                                    &root, &new_node)) {
 697                 DEBUG(10, ("acl_modify: cannot add to object tree\n"));
 698                 goto fail;
 699         }
 700         for (i=0; i < req->op.mod.message->num_elements; i++){
 701                 const struct dsdb_attribute *attr;
 702                 attr = dsdb_attribute_by_lDAPDisplayName(schema,
 703                                                                  req->op.mod.message->elements[i].name);
 704
 705                 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
 706                         status = sec_access_check_ds(sd, acl_user_token(module),
 707                                              SEC_STD_WRITE_DAC,
 708                                              &access_granted,
 709                                              NULL,
 710                                              sid);
 711
 712                         if (!NT_STATUS_IS_OK(status)) {
 713                                 DEBUG(10, ("Object %s has no write dacl access\n",
 714                                            ldb_dn_get_linearized(req->op.mod.message->dn)));
 715                                 dsdb_acl_debug(sd,
 716                                                acl_user_token(module),
 717                                                req->op.mod.message->dn,
 718                                                true,
 719                                                10);
 720                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 721                                 goto fail;
 722                         }
 723                 }
 724                 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
 725                         ret = acl_check_self_membership(tmp_ctx,
 726                                                         module,
 727                                                         req,
 728                                                         sd,
 729                                                         sid,
 730                                                         guid,
 731                                                         attr);
 732                         if (ret != LDB_SUCCESS) {
 733                                 goto fail;
 734                         }
 735                 }
 736                 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
 737                         /* this one is not affected by any rights, we should let it through
 738                            so that passwords_hash returns the correct error */
 739                         continue;
 740                 }
 741                 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
 742                          (userPassword && ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0) ||
 743                          ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
 744                         ret = acl_check_password_rights(tmp_ctx,
 745                                                         module,
 746                                                         req,
 747                                                         sd,
 748                                                         sid,
 749                                                         guid,
 750                                                         userPassword);
 751                         if (ret != LDB_SUCCESS) {
 752                                 goto fail;
 753                         }
 754                 } else {
 755
 756                 /* This basic attribute existence check with the right errorcode
 757                  * is needed since this module is the first one which requests
 758                  * schema attribute informations.
 759                  * The complete attribute checking is done in the
 760                  * "objectclass_attrs" module behind this one.
 761                  */
 762                         if (!attr) {
 763                                 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
 764                                                        req->op.mod.message->elements[i].name,
 765                                                ldb_dn_get_linearized(req->op.mod.message->dn));
 766                                 ret =  LDB_ERR_NO_SUCH_ATTRIBUTE;
 767                                 goto fail;
 768                         }
 769                         if (!insert_in_object_tree(tmp_ctx,
 770                                                    &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
 771                                                    &new_node, &new_node)) {
 772                                 DEBUG(10, ("acl_modify: cannot add to object tree securityGUID\n"));
 773                                 ret = LDB_ERR_OPERATIONS_ERROR;
 774                                 goto fail;
 775                         }
 776
 777                         if (!insert_in_object_tree(tmp_ctx,
 778                                                    &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
 779                                 DEBUG(10, ("acl_modify: cannot add to object tree attributeGUID\n"));
 780                                 ret = LDB_ERR_OPERATIONS_ERROR;
 781                                 goto fail;
 782                         }
 783                 }
 784         }
 785
 786         if (root->num_of_children > 0) {
 787                 status = sec_access_check_ds(sd, acl_user_token(module),
 788                                              SEC_ADS_WRITE_PROP,
 789                                              &access_granted,
 790                                              root,
 791                                              sid);
 792
 793                 if (!NT_STATUS_IS_OK(status)) {
 794                         DEBUG(10, ("Object %s has no write property access\n",
 795                                    ldb_dn_get_linearized(req->op.mod.message->dn)));
 796                         dsdb_acl_debug(sd,
 797                                   acl_user_token(module),
 798                                   req->op.mod.message->dn,
 799                                   true,
 800                                   10);
 801                         ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 802                         goto fail;
 803                 }
 804         }
 805
 806 success:
 807         talloc_free(tmp_ctx);
 808         return ldb_next_request(module, req);
 809 fail:
 810         talloc_free(tmp_ctx);
 811         return ret;
 812 }
 813
 814 /* similar to the modify for the time being.
 815  * We need to concider the special delete tree case, though - TODO */
 816 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
 817 {
 818         int ret;
 819         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
 820         struct ldb_context *ldb;
 821         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 822
 823         if (as_system != NULL) {
 824                 as_system->critical = 0;
 825         }
 826
 827         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
 828         if (dsdb_module_am_system(module) || as_system) {
 829                 return ldb_next_request(module, req);
 830         }
 831
 832         if (ldb_dn_is_special(req->op.del.dn)) {
 833                 return ldb_next_request(module, req);
 834         }
 835         ldb = ldb_module_get_ctx(module);
 836         /* first check if we have delete object right */
 837         ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn, SEC_STD_DELETE, NULL);
 838         if (ret == LDB_SUCCESS) {
 839                 return ldb_next_request(module, req);
 840         }
 841
 842         /* Nope, we don't have delete object. Lets check if we have delete child on the parent */
 843         /* No parent, so check fails */
 844         /* FIXME: this has to be made dynamic at some point */
 845         if ((ldb_dn_compare(req->op.del.dn, (ldb_get_schema_basedn(ldb))) == 0) ||
 846             (ldb_dn_compare(req->op.del.dn, (ldb_get_config_basedn(ldb))) == 0) ||
 847             (ldb_dn_compare(req->op.del.dn, (ldb_get_default_basedn(ldb))) == 0)) {
 848                 DEBUG(10,("acl:deleting an NC\n"));
 849                 return ldb_module_done(req, NULL, NULL, LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS);
 850         }
 851
 852         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_DELETE_CHILD, NULL);
 853         if (ret != LDB_SUCCESS) {
 854                 return ret;
 855         }
 856         return ldb_next_request(module, req);
 857 }
 858
 859 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
 860 {
 861         int ret;
 862         struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
 863         struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
 864         const struct dsdb_schema *schema;
 865         struct ldb_context *ldb;
 866         struct security_descriptor *sd = NULL;
 867         struct dom_sid *sid = NULL;
 868         struct ldb_result *acl_res;
 869         const struct GUID *guid;
 870         struct object_tree *root = NULL;
 871         struct object_tree *new_node = NULL;
 872         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 873         TALLOC_CTX *tmp_ctx = talloc_new(req);
 874         NTSTATUS status;
 875         uint32_t access_granted;
 876         const char *rdn_name;
 877         static const char *acl_attrs[] = {
 878                 "nTSecurityDescriptor",
 879                 "objectClass",
 880                 "objectSid",
 881                 NULL
 882         };
 883
 884         if (as_system != NULL) {
 885                 as_system->critical = 0;
 886         }
 887
 888         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
 889         if (dsdb_module_am_system(module) || as_system) {
 890                 return ldb_next_request(module, req);
 891         }
 892         if (ldb_dn_is_special(req->op.rename.olddn)) {
 893                 return ldb_next_request(module, req);
 894         }
 895         ldb = ldb_module_get_ctx(module);
 896
 897         ret = dsdb_module_search_dn(module, req, &acl_res, req->op.rename.olddn,
 898                                     acl_attrs,
 899                                     DSDB_FLAG_NEXT_MODULE |
 900                                     DSDB_SEARCH_SHOW_RECYCLED);
 901         /* we sould be able to find the parent */
 902         if (ret != LDB_SUCCESS) {
 903                 DEBUG(10,("acl: failed to find object %s\n",
 904                           ldb_dn_get_linearized(req->op.rename.olddn)));
 905                 return ret;
 906         }
 907
 908         schema = dsdb_get_schema(ldb, acl_res);
 909         if (!schema) {
 910                 talloc_free(acl_res);
 911                 return ldb_operr(ldb);
 912         }
 913
 914         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
 915         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 916                                    &root, &new_node)) {
 917                 return ldb_operr(ldb);
 918         };
 919
 920         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
 921                                                           "name");
 922         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 923                                    &new_node, &new_node)) {
 924                 return ldb_operr(ldb);
 925         };
 926
 927         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
 928         if (rdn_name == NULL) {
 929                 return ldb_operr(ldb);
 930         }
 931         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
 932                                                           rdn_name);
 933         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 934                                    &new_node, &new_node)) {
 935                 return ldb_operr(ldb);
 936         };
 937
 938         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
 939
 940         if (ret != LDB_SUCCESS) {
 941                 return ldb_operr(ldb);
 942         }
 943         /* Theoretically we pass the check if the object has no sd */
 944         if (!sd) {
 945                 return LDB_SUCCESS;
 946         }
 947         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
 948         status = sec_access_check_ds(sd, acl_user_token(module),
 949                                      SEC_ADS_WRITE_PROP,
 950                                      &access_granted,
 951                                      root,
 952                                      sid);
 953
 954         if (!NT_STATUS_IS_OK(status)) {
 955                 DEBUG(10, ("Object %s has no wp on name\n",
 956                            ldb_dn_get_linearized(req->op.rename.olddn)));
 957                 dsdb_acl_debug(sd,
 958                           acl_user_token(module),
 959                           req->op.rename.olddn,
 960                           true,
 961                           10);
 962                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 963         }
 964
 965         if (ldb_dn_compare(oldparent, newparent) == 0) {
 966                 /* regular rename, not move, nothing more to do */
 967                 return ldb_next_request(module, req);
 968         }
 969
 970         /* What exactly to do in this case? It would fail anyway.. */
 971         /* FIXME: this has to be made dynamic at some point */
 972         if ((ldb_dn_compare(req->op.rename.newdn, (ldb_get_schema_basedn(ldb))) == 0) ||
 973             (ldb_dn_compare(req->op.rename.newdn, (ldb_get_config_basedn(ldb))) == 0) ||
 974             (ldb_dn_compare(req->op.rename.newdn, (ldb_get_default_basedn(ldb))) == 0)) {
 975                 DEBUG(10,("acl:moving as an NC\n"));
 976                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 977         }
 978         /* new parent should have create child */
 979         talloc_free(tmp_ctx);
 980         tmp_ctx = talloc_new(req);
 981         root = NULL;
 982         new_node = NULL;
 983         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
 984         if (!guid) {
 985                 DEBUG(10,("acl:renamed object has no object class\n"));
 986                 return ldb_module_done(req, NULL, NULL,  LDB_ERR_OPERATIONS_ERROR);
 987         }
 988
 989         ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid);
 990         if (ret != LDB_SUCCESS) {
 991                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
 992                 return ret;
 993         }
 994         /* do we have delete object on the object? */
 995
 996         status = sec_access_check_ds(sd, acl_user_token(module),
 997                                      SEC_STD_DELETE,
 998                                      &access_granted,
 999                                      NULL,
1000                                      sid);
1001
1002         if (NT_STATUS_IS_OK(status)) {
1003                 return ldb_next_request(module, req);
1004         }
1005         /* what about delete child on the current parent */
1006         ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL);
1007         if (ret != LDB_SUCCESS) {
1008                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1009                 return ldb_module_done(req, NULL, NULL, ret);
1010         }
1011         return ldb_next_request(module, req);
1012 }
1013
1014 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1015 {
1016         struct ldb_context *ldb;
1017         struct acl_context *ac;
1018         struct acl_private *data;
1019         struct ldb_result *acl_res;
1020         static const char *acl_attrs[] = {
1021                 "objectClass",
1022                 "nTSecurityDescriptor",
1023                 "objectSid",
1024                 NULL
1025         };
1026         int ret, i;
1027
1028         ac = talloc_get_type(req->context, struct acl_context);
1029         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1030         ldb = ldb_module_get_ctx(ac->module);
1031
1032         if (!ares) {
1033                 return ldb_module_done(ac->req, NULL, NULL,
1034                                        LDB_ERR_OPERATIONS_ERROR);
1035         }
1036         if (ares->error != LDB_SUCCESS) {
1037                 return ldb_module_done(ac->req, ares->controls,
1038                                        ares->response, ares->error);
1039         }
1040
1041         switch (ares->type) {
1042         case LDB_REPLY_ENTRY:
1043                 if (ac->allowedAttributes
1044                     || ac->allowedChildClasses
1045                     || ac->allowedChildClassesEffective
1046                     || ac->allowedAttributesEffective
1047                     || ac->sDRightsEffective) {
1048                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1049                                                     acl_attrs,
1050                                                     DSDB_FLAG_NEXT_MODULE);
1051                         if (ret != LDB_SUCCESS) {
1052                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1053                         }
1054                         if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1055                                 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1056                                 if (ret != LDB_SUCCESS) {
1057                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1058                                 }
1059                         }
1060                         if (ac->allowedChildClasses) {
1061                                 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1062                                                        ares->message, "allowedChildClasses");
1063                                 if (ret != LDB_SUCCESS) {
1064                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1065                                 }
1066                         }
1067                         if (ac->allowedChildClassesEffective) {
1068                                 ret = acl_childClassesEffective(ac->module, ac->schema,
1069                                                                 acl_res->msgs[0], ares->message, ac);
1070                                 if (ret != LDB_SUCCESS) {
1071                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1072                                 }
1073                         }
1074                         if (ac->sDRightsEffective) {
1075                                 ret = acl_sDRightsEffective(ac->module,
1076                                                             acl_res->msgs[0], ares->message, ac);
1077                                 if (ret != LDB_SUCCESS) {
1078                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1079                                 }
1080                         }
1081                 }
1082                 if (data && data->password_attrs) {
1083                         if (!ac->am_system) {
1084                                 for (i = 0; data->password_attrs[i]; i++) {
1085                                         if ((!ac->userPassword) &&
1086                                             (ldb_attr_cmp(data->password_attrs[i],
1087                                                           "userPassword") == 0))
1088                                                 continue;
1089
1090                                         ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1091                                 }
1092                         }
1093                 }
1094                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1095
1096         case LDB_REPLY_REFERRAL:
1097                 return ldb_module_send_referral(ac->req, ares->referral);
1098
1099         case LDB_REPLY_DONE:
1100                 return ldb_module_done(ac->req, ares->controls,
1101                                        ares->response, LDB_SUCCESS);
1102
1103         }
1104         return LDB_SUCCESS;
1105 }
1106
1107 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1108 {
1109         struct ldb_context *ldb;
1110         struct acl_context *ac;
1111         struct ldb_request *down_req;
1112         struct acl_private *data;
1113         int ret, i;
1114
1115         ldb = ldb_module_get_ctx(module);
1116
1117         ac = talloc_zero(req, struct acl_context);
1118         if (ac == NULL) {
1119                 return ldb_oom(ldb);
1120         }
1121         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1122
1123         ac->module = module;
1124         ac->req = req;
1125         ac->am_system = dsdb_module_am_system(module);
1126         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1127         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1128         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1129         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1130         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1131         ac->userPassword = dsdb_user_password_support(module, ac);
1132         ac->schema = dsdb_get_schema(ldb, ac);
1133
1134         /* replace any attributes in the parse tree that are private,
1135            so we don't allow a search for 'userPassword=penguin',
1136            just as we would not allow that attribute to be returned */
1137         if (ac->am_system) {
1138                 /* FIXME: We should copy the tree and keep the original unmodified. */
1139                 /* remove password attributes */
1140                 if (data && data->password_attrs) {
1141                         for (i = 0; data->password_attrs[i]; i++) {
1142                                 if ((!ac->userPassword) &&
1143                                     (ldb_attr_cmp(data->password_attrs[i],
1144                                                   "userPassword") == 0))
1145                                                 continue;
1146
1147                                 ldb_parse_tree_attr_replace(req->op.search.tree,
1148                                                             data->password_attrs[i],
1149                                                             "kludgeACLredactedattribute");
1150                         }
1151                 }
1152         }
1153         ret = ldb_build_search_req_ex(&down_req,
1154                                       ldb, ac,
1155                                       req->op.search.base,
1156                                       req->op.search.scope,
1157                                       req->op.search.tree,
1158                                       req->op.search.attrs,
1159                                       req->controls,
1160                                       ac, acl_search_callback,
1161                                       req);
1162         LDB_REQ_SET_LOCATION(down_req);
1163         if (ret != LDB_SUCCESS) {
1164                 return ret;
1165         }
1166         /* perform the search */
1167         return ldb_next_request(module, down_req);
1168 }
1169
1170 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1171 {
1172         struct ldb_context *ldb = ldb_module_get_ctx(module);
1173         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1174
1175         /* allow everybody to read the sequence number */
1176         if (strcmp(req->op.extended.oid,
1177                    LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1178                 return ldb_next_request(module, req);
1179         }
1180
1181         if (dsdb_module_am_system(module) ||
1182             dsdb_module_am_administrator(module) || as_system) {
1183                 return ldb_next_request(module, req);
1184         } else {
1185                 ldb_asprintf_errstring(ldb,
1186                                        "acl_extended: "
1187                                        "attempted database modify not permitted. "
1188                                        "User %s is not SYSTEM or an administrator",
1189                                        acl_user_name(req, module));
1190                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1191         }
1192 }
1193
1194 static const struct ldb_module_ops ldb_acl_module_ops = {
1195         .name              = "acl",
1196         .search            = acl_search,
1197         .add               = acl_add,
1198         .modify            = acl_modify,
1199         .del               = acl_delete,
1200         .rename            = acl_rename,
1201         .extended          = acl_extended,
1202         .init_context      = acl_module_init
1203 };
1204
1205 int ldb_acl_module_init(const char *version)
1206 {
1207         LDB_MODULE_CHECK_VERSION(version);
1208         return ldb_register_module(&ldb_acl_module_ops);
1209 }