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 "lib/util/tsort.h"
  43
  44 struct extended_access_check_attribute {
  45         const char *oa_name;
  46         const uint32_t requires_rights;
  47 };
  48
  49 struct acl_private {
  50         bool acl_perform;
  51         const char **password_attrs;
  52 };
  53
  54 struct acl_context {
  55         struct ldb_module *module;
  56         struct ldb_request *req;
  57         bool am_system;
  58         bool allowedAttributes;
  59         bool allowedAttributesEffective;
  60         bool allowedChildClasses;
  61         bool allowedChildClassesEffective;
  62         bool sDRightsEffective;
  63         const char * const *attrs;
  64         struct dsdb_schema *schema;
  65 };
  66
  67 bool is_root_base_dn(struct ldb_context *ldb, struct ldb_dn *dn_to_check)
  68 {
  69         int result;
  70         struct ldb_dn *root_base_dn = ldb_get_root_basedn(ldb);
  71         result = ldb_dn_compare(root_base_dn,dn_to_check);
  72         return (result==0);
  73 }
  74
  75 static struct security_token *acl_user_token(struct ldb_module *module)
  76 {
  77         struct ldb_context *ldb = ldb_module_get_ctx(module);
  78         struct auth_session_info *session_info
  79                 = (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
  80         if(!session_info) {
  81                 return NULL;
  82         }
  83         return session_info->security_token;
  84 }
  85
  86 /* performs an access check from inside the module stack
  87  * given the dn of the object to be checked, the required access
  88  * guid is either the guid of the extended right, or NULL
  89  */
  90
  91 int dsdb_module_check_access_on_dn(struct ldb_module *module,
  92                                    TALLOC_CTX *mem_ctx,
  93                                    struct ldb_dn *dn,
  94                                    uint32_t access,
  95                                    const struct GUID *guid)
  96 {
  97         int ret;
  98         struct ldb_result *acl_res;
  99         static const char *acl_attrs[] = {
 100                 "nTSecurityDescriptor",
 101                 "objectSid",
 102                 NULL
 103         };
 104         struct ldb_context *ldb = ldb_module_get_ctx(module);
 105         struct auth_session_info *session_info
 106                 = (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
 107         if(!session_info) {
 108                 return LDB_ERR_OPERATIONS_ERROR;
 109         }
 110         ret = dsdb_module_search_dn(module, mem_ctx, &acl_res, dn,
 111                                     acl_attrs, DSDB_SEARCH_SHOW_DELETED);
 112         if (ret != LDB_SUCCESS) {
 113                 DEBUG(10,("access_check: failed to find object %s\n", ldb_dn_get_linearized(dn)));
 114                 return ret;
 115         }
 116         return dsdb_check_access_on_dn_internal(acl_res,
 117                                                 mem_ctx,
 118                                                 session_info->security_token,
 119                                                 dn,
 120                                                 access,
 121                                                 guid);
 122 }
 123
 124
 125 static int acl_module_init(struct ldb_module *module)
 126 {
 127         struct ldb_context *ldb;
 128         struct acl_private *data;
 129         int ret, i;
 130         TALLOC_CTX *mem_ctx = talloc_new(module);
 131         static const char *attrs[] = { "passwordAttribute", NULL };
 132         struct ldb_result *res;
 133         struct ldb_message *msg;
 134         struct ldb_message_element *password_attributes;
 135
 136         ldb = ldb_module_get_ctx(module);
 137
 138         ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
 139         if (ret != LDB_SUCCESS) {
 140                 ldb_debug(ldb, LDB_DEBUG_ERROR,
 141                           "acl_module_init: Unable to register control with rootdse!\n");
 142                 return LDB_ERR_OPERATIONS_ERROR;
 143         }
 144
 145         data = talloc(module, struct acl_private);
 146         if (data == NULL) {
 147                 ldb_oom(ldb);
 148                 return LDB_ERR_OPERATIONS_ERROR;
 149         }
 150
 151         data->password_attrs = NULL;
 152         data->acl_perform = lp_parm_bool(ldb_get_opaque(ldb, "loadparm"),
 153                                          NULL, "acl", "perform", false);
 154         ldb_module_set_private(module, data);
 155
 156         if (!mem_ctx) {
 157                 ldb_oom(ldb);
 158                 return LDB_ERR_OPERATIONS_ERROR;
 159         }
 160
 161         ret = dsdb_module_search_dn(module, mem_ctx, &res,
 162                                     ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
 163                                     attrs, 0);
 164         if (ret != LDB_SUCCESS) {
 165                 goto done;
 166         }
 167         if (res->count == 0) {
 168                 goto done;
 169         }
 170
 171         if (res->count > 1) {
 172                 talloc_free(mem_ctx);
 173                 return LDB_ERR_CONSTRAINT_VIOLATION;
 174         }
 175
 176         msg = res->msgs[0];
 177
 178         password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
 179         if (!password_attributes) {
 180                 goto done;
 181         }
 182         data->password_attrs = talloc_array(data, const char *, password_attributes->num_values + 1);
 183         if (!data->password_attrs) {
 184                 talloc_free(mem_ctx);
 185                 ldb_oom(ldb);
 186                 return LDB_ERR_OPERATIONS_ERROR;
 187         }
 188         for (i=0; i < password_attributes->num_values; i++) {
 189                 data->password_attrs[i] = (const char *)password_attributes->values[i].data;
 190                 talloc_steal(data->password_attrs, password_attributes->values[i].data);
 191         }
 192         data->password_attrs[i] = NULL;
 193
 194 done:
 195         talloc_free(mem_ctx);
 196         return ldb_next_init(module);
 197 }
 198
 199 static const struct GUID *get_oc_guid_from_message(struct ldb_module *module,
 200                                                    const struct dsdb_schema *schema,
 201                                                    struct ldb_message *msg)
 202 {
 203         struct ldb_message_element *oc_el;
 204
 205         oc_el = ldb_msg_find_element(msg, "objectClass");
 206         if (!oc_el) {
 207                 return NULL;
 208         }
 209
 210         return class_schemaid_guid_by_lDAPDisplayName(schema,
 211                                                       (char *)oc_el->values[oc_el->num_values-1].data);
 212 }
 213
 214 static int acl_check_access_on_attribute(struct ldb_module *module,
 215                                          TALLOC_CTX *mem_ctx,
 216                                          struct security_descriptor *sd,
 217                                          struct dom_sid *rp_sid,
 218                                          uint32_t access,
 219                                          const struct dsdb_attribute *attr)
 220 {
 221         int ret;
 222         NTSTATUS status;
 223         uint32_t access_granted;
 224         struct object_tree *root = NULL;
 225         struct object_tree *new_node = NULL;
 226         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 227         struct security_token *token = acl_user_token(module);
 228         if (attr) {
 229                 if (!GUID_all_zero(&attr->attributeSecurityGUID)) {
 230                         if (!insert_in_object_tree(tmp_ctx,
 231                                                    &attr->attributeSecurityGUID, access,
 232                                                    &root, &new_node)) {
 233                                 DEBUG(10, ("acl_search: cannot add to object tree securityGUID\n"));
 234                                 goto fail;
 235                         }
 236
 237                         if (!insert_in_object_tree(tmp_ctx,
 238                                                    &attr->schemaIDGUID, access, &new_node, &new_node)) {
 239                                 DEBUG(10, ("acl_search: cannot add to object tree attributeGUID\n"));
 240                                 goto fail;
 241                         }
 242                 }
 243                 else {
 244                         if (!insert_in_object_tree(tmp_ctx,
 245                                                    &attr->schemaIDGUID, access, &root, &new_node)) {
 246                                 DEBUG(10, ("acl_search: cannot add to object tree attributeGUID\n"));
 247                                 goto fail;
 248                         }
 249                 }
 250         }
 251         status = sec_access_check_ds(sd, token,
 252                                      access,
 253                                      &access_granted,
 254                                      root,
 255                                      rp_sid);
 256         if (!NT_STATUS_IS_OK(status)) {
 257                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 258         }
 259         else {
 260                 ret = LDB_SUCCESS;
 261         }
 262         return ret;
 263 fail:
 264         return LDB_ERR_OPERATIONS_ERROR;
 265 }
 266
 267 static int acl_check_access_on_class(struct ldb_module *module,
 268                                      const struct dsdb_schema *schema,
 269                                      TALLOC_CTX *mem_ctx,
 270                                      struct security_descriptor *sd,
 271                                      struct dom_sid *rp_sid,
 272                                      uint32_t access,
 273                                      const char *class_name)
 274 {
 275         int ret;
 276         NTSTATUS status;
 277         uint32_t access_granted;
 278         struct object_tree *root = NULL;
 279         struct object_tree *new_node = NULL;
 280         const struct GUID *guid;
 281         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 282         struct security_token *token = acl_user_token(module);
 283         if (class_name) {
 284                 guid = class_schemaid_guid_by_lDAPDisplayName(schema, class_name);
 285                 if (!guid) {
 286                         DEBUG(10, ("acl_search: cannot find class %s\n",
 287                                    class_name));
 288                         goto fail;
 289                 }
 290                 if (!insert_in_object_tree(tmp_ctx,
 291                                            guid, access,
 292                                            &root, &new_node)) {
 293                         DEBUG(10, ("acl_search: cannot add to object tree guid\n"));
 294                         goto fail;
 295                 }
 296         }
 297         status = sec_access_check_ds(sd, token,
 298                                      access,
 299                                      &access_granted,
 300                                      root,
 301                                      rp_sid);
 302         if (!NT_STATUS_IS_OK(status)) {
 303                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 304         }
 305         else {
 306                 ret = LDB_SUCCESS;
 307         }
 308         return ret;
 309 fail:
 310         return LDB_ERR_OPERATIONS_ERROR;
 311 }
 312
 313 static int acl_allowedAttributes(struct ldb_module *module,
 314                                  const struct dsdb_schema *schema,
 315                                  struct ldb_message *sd_msg,
 316                                  struct ldb_message *msg,
 317                                  struct acl_context *ac)
 318 {
 319         struct ldb_message_element *oc_el;
 320         struct ldb_context *ldb = ldb_module_get_ctx(module);
 321         TALLOC_CTX *mem_ctx;
 322         const char **attr_list;
 323         int i, ret;
 324
 325         /* If we don't have a schema yet, we can't do anything... */
 326         if (schema == NULL) {
 327                 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 328                 return LDB_ERR_OPERATIONS_ERROR;
 329         }
 330
 331         /* Must remove any existing attribute */
 332         if (ac->allowedAttributes) {
 333                 ldb_msg_remove_attr(msg, "allowedAttributes");
 334         }
 335
 336         mem_ctx = talloc_new(msg);
 337         if (!mem_ctx) {
 338                 ldb_oom(ldb);
 339                 return LDB_ERR_OPERATIONS_ERROR;
 340         }
 341
 342         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 343         attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
 344         if (!attr_list) {
 345                 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
 346                 talloc_free(mem_ctx);
 347                 return LDB_ERR_OPERATIONS_ERROR;
 348         }
 349         if (ac->allowedAttributes) {
 350                 for (i=0; attr_list && attr_list[i]; i++) {
 351                         ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
 352                 }
 353         }
 354         if (ac->allowedAttributesEffective) {
 355                 struct security_descriptor *sd;
 356                 struct dom_sid *sid = NULL;
 357                 struct ldb_control *as_system = ldb_request_get_control(ac->req,
 358                                                                         LDB_CONTROL_AS_SYSTEM_OID);
 359
 360                 if (as_system != NULL) {
 361                         as_system->critical = 0;
 362                 }
 363
 364                 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
 365                 if (ac->am_system || as_system) {
 366                         for (i=0; attr_list && attr_list[i]; i++) {
 367                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 368                         }
 369                         return LDB_SUCCESS;
 370                 }
 371
 372                 ret = dsdb_get_sd_from_ldb_message(mem_ctx, sd_msg, &sd);
 373
 374                 if (ret != LDB_SUCCESS) {
 375                         return ret;
 376                 }
 377
 378                 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
 379                 for (i=0; attr_list && attr_list[i]; i++) {
 380                         const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
 381                                                                                         attr_list[i]);
 382                         if (!attr) {
 383                                 return LDB_ERR_OPERATIONS_ERROR;
 384                         }
 385                         /* remove constructed attributes */
 386                         if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
 387                             || attr->systemOnly
 388                             || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
 389                                 continue;
 390                         }
 391                         ret = acl_check_access_on_attribute(module,
 392                                                             msg,
 393                                                             sd,
 394                                                             sid,
 395                                                             SEC_ADS_WRITE_PROP,
 396                                                             attr);
 397                         if (ret == LDB_SUCCESS) {
 398                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 399                         }
 400                 }
 401         }
 402         return LDB_SUCCESS;
 403 }
 404
 405 static int acl_childClasses(struct ldb_module *module,
 406                             const struct dsdb_schema *schema,
 407                             struct ldb_message *sd_msg,
 408                             struct ldb_message *msg,
 409                             const char *attrName)
 410 {
 411         struct ldb_message_element *oc_el;
 412         struct ldb_message_element *allowedClasses;
 413         const struct dsdb_class *sclass;
 414         unsigned int i, j;
 415         int ret;
 416
 417         /* If we don't have a schema yet, we can't do anything... */
 418         if (schema == NULL) {
 419                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 420                 return LDB_ERR_OPERATIONS_ERROR;
 421         }
 422
 423         /* Must remove any existing attribute, or else confusion reins */
 424         ldb_msg_remove_attr(msg, attrName);
 425         ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
 426         if (ret != LDB_SUCCESS) {
 427                 return ret;
 428         }
 429
 430         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 431
 432         for (i=0; oc_el && i < oc_el->num_values; i++) {
 433                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 434                 if (!sclass) {
 435                         /* We don't know this class?  what is going on? */
 436                         continue;
 437                 }
 438
 439                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 440                         ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
 441                 }
 442         }
 443         if (allowedClasses->num_values > 1) {
 444                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 445                 for (i=1 ; i < allowedClasses->num_values; i++) {
 446                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 447                         struct ldb_val *val2 = &allowedClasses->values[i];
 448                         if (data_blob_cmp(val1, val2) == 0) {
 449                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
 450                                 allowedClasses->num_values--;
 451                                 i--;
 452                         }
 453                 }
 454         }
 455
 456         return LDB_SUCCESS;
 457 }
 458
 459 static int acl_childClassesEffective(struct ldb_module *module,
 460                                      const struct dsdb_schema *schema,
 461                                      struct ldb_message *sd_msg,
 462                                      struct ldb_message *msg,
 463                                      struct acl_context *ac)
 464 {
 465         struct ldb_message_element *oc_el;
 466         struct ldb_message_element *allowedClasses = NULL;
 467         const struct dsdb_class *sclass;
 468         struct security_descriptor *sd;
 469         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 470                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 471         struct dom_sid *sid = NULL;
 472         unsigned int i, j;
 473         int ret;
 474
 475         if (as_system != NULL) {
 476                 as_system->critical = 0;
 477         }
 478
 479         if (ac->am_system || as_system) {
 480                 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
 481         }
 482
 483         /* If we don't have a schema yet, we can't do anything... */
 484         if (schema == NULL) {
 485                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 486                 return LDB_ERR_OPERATIONS_ERROR;
 487         }
 488
 489         /* Must remove any existing attribute, or else confusion reins */
 490         ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
 491
 492         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 493         ret = dsdb_get_sd_from_ldb_message(msg, sd_msg, &sd);
 494         if (ret != LDB_SUCCESS) {
 495                 return ret;
 496         }
 497
 498         sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 499         for (i=0; oc_el && i < oc_el->num_values; i++) {
 500                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 501                 if (!sclass) {
 502                         /* We don't know this class?  what is going on? */
 503                         continue;
 504                 }
 505
 506                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 507                         ret = acl_check_access_on_class(module,
 508                                                         schema,
 509                                                         msg,
 510                                                         sd,
 511                                                         sid,
 512                                                         SEC_ADS_CREATE_CHILD,
 513                                                         sclass->possibleInferiors[j]);
 514                         if (ret == LDB_SUCCESS) {
 515                                 ldb_msg_add_string(msg, "allowedChildClassesEffective",
 516                                                    sclass->possibleInferiors[j]);
 517                         }
 518                 }
 519         }
 520         allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
 521         if (!allowedClasses) {
 522                 return LDB_SUCCESS;
 523         }
 524
 525         if (allowedClasses->num_values > 1) {
 526                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 527                 for (i=1 ; i < allowedClasses->num_values; i++) {
 528                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 529                         struct ldb_val *val2 = &allowedClasses->values[i];
 530                         if (data_blob_cmp(val1, val2) == 0) {
 531                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
 532                                 allowedClasses->num_values--;
 533                                 i--;
 534                         }
 535                 }
 536         }
 537         return LDB_SUCCESS;
 538 }
 539
 540 static int acl_sDRightsEffective(struct ldb_module *module,
 541                                  struct ldb_message *sd_msg,
 542                                  struct ldb_message *msg,
 543                                  struct acl_context *ac)
 544 {
 545         struct ldb_message_element *rightsEffective;
 546         int ret;
 547         struct security_descriptor *sd;
 548         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 549                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 550         struct dom_sid *sid = NULL;
 551         uint32_t flags = 0;
 552
 553         if (as_system != NULL) {
 554                 as_system->critical = 0;
 555         }
 556
 557         /* Must remove any existing attribute, or else confusion reins */
 558         ldb_msg_remove_attr(msg, "sDRightsEffective");
 559         ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
 560         if (ret != LDB_SUCCESS) {
 561                 return ret;
 562         }
 563         if (ac->am_system || as_system) {
 564                 flags = SECINFO_OWNER | SECINFO_GROUP |  SECINFO_SACL |  SECINFO_DACL;
 565         }
 566         else {
 567                 /* Get the security descriptor from the message */
 568                 ret = dsdb_get_sd_from_ldb_message(msg, sd_msg, &sd);
 569                 if (ret != LDB_SUCCESS) {
 570                         return ret;
 571                 }
 572                 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 573                 ret = acl_check_access_on_attribute(module,
 574                                                     msg,
 575                                                     sd,
 576                                                     sid,
 577                                                     SEC_STD_WRITE_OWNER,
 578                                                     NULL);
 579                 if (ret == LDB_SUCCESS) {
 580                         flags |= SECINFO_OWNER | SECINFO_GROUP;
 581                 }
 582                 ret = acl_check_access_on_attribute(module,
 583                                                     msg,
 584                                                     sd,
 585                                                     sid,
 586                                                     SEC_STD_WRITE_DAC,
 587                                                     NULL);
 588                 if (ret == LDB_SUCCESS) {
 589                         flags |= SECINFO_DACL;
 590                 }
 591                 ret = acl_check_access_on_attribute(module,
 592                                                     msg,
 593                                                     sd,
 594                                                     sid,
 595                                                     SEC_FLAG_SYSTEM_SECURITY,
 596                                                     NULL);
 597                 if (ret == LDB_SUCCESS) {
 598                         flags |= SECINFO_SACL;
 599                 }
 600         }
 601         ldb_msg_add_fmt(msg, "sDRightsEffective", "%u", flags);
 602         return LDB_SUCCESS;
 603 }
 604
 605 static int acl_add(struct ldb_module *module, struct ldb_request *req)
 606 {
 607         int ret;
 608         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
 609         struct ldb_context *ldb;
 610         const struct dsdb_schema *schema;
 611         struct ldb_message_element *oc_el;
 612         const struct GUID *guid;
 613         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 614
 615         if (as_system != NULL) {
 616                 as_system->critical = 0;
 617         }
 618
 619         if (dsdb_module_am_system(module) || as_system) {
 620                 return ldb_next_request(module, req);
 621         }
 622
 623         if (ldb_dn_is_special(req->op.add.message->dn)) {
 624                 return ldb_next_request(module, req);
 625         }
 626         ldb = ldb_module_get_ctx(module);
 627         /* Creating an NC. There is probably something we should do here,
 628          * but we will establish that later */
 629         /* FIXME: this has to be made dynamic at some point */
 630         if ((ldb_dn_compare(req->op.add.message->dn, (ldb_get_schema_basedn(ldb))) == 0) ||
 631             (ldb_dn_compare(req->op.add.message->dn, (ldb_get_config_basedn(ldb))) == 0) ||
 632             (ldb_dn_compare(req->op.add.message->dn, (ldb_get_default_basedn(ldb))) == 0) ||
 633             (ldb_dn_compare(req->op.add.message->dn, (ldb_get_root_basedn(ldb))) == 0)) {
 634                 return ldb_next_request(module, req);
 635         }
 636
 637         schema = dsdb_get_schema(ldb, req);
 638         if (!schema) {
 639                 return LDB_ERR_OPERATIONS_ERROR;
 640         }
 641
 642         oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
 643         if (!oc_el || oc_el->num_values == 0) {
 644                 DEBUG(10,("acl:operation error %s\n", ldb_dn_get_linearized(req->op.add.message->dn)));
 645                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 646         }
 647
 648         guid = class_schemaid_guid_by_lDAPDisplayName(schema,
 649                                                       (char *)oc_el->values[oc_el->num_values-1].data);
 650         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid);
 651         if (ret != LDB_SUCCESS) {
 652                 return ret;
 653         }
 654         return ldb_next_request(module, req);
 655 }
 656
 657 /* checks for validated writes */
 658 static int acl_check_self_write(struct ldb_request *req,
 659                                 struct security_descriptor *sd,
 660                                 struct security_token *token,
 661                                 const char *self_write,
 662                                 struct dom_sid *sid)
 663 {
 664         struct GUID right;
 665         NTSTATUS status;
 666         uint32_t access_granted;
 667         struct object_tree *root = NULL;
 668         struct object_tree *new_node = NULL;
 669         TALLOC_CTX *tmp_ctx = talloc_new(req);
 670
 671         GUID_from_string(self_write, &right);
 672
 673         if (!insert_in_object_tree(tmp_ctx, &right, SEC_ADS_SELF_WRITE,
 674                                    &root, &new_node)) {
 675                 DEBUG(10, ("acl_modify: cannot add to object tree\n"));
 676                 talloc_free(tmp_ctx);
 677                 return LDB_ERR_OPERATIONS_ERROR;
 678         }
 679         status = sec_access_check_ds(sd, token,
 680                                      SEC_ADS_SELF_WRITE,
 681                                      &access_granted,
 682                                      root,
 683                                      sid);
 684
 685         if (!NT_STATUS_IS_OK(status)) {
 686                 DEBUG(10, ("Object %s has no self membershipself write right\n",
 687                            ldb_dn_get_linearized(req->op.mod.message->dn)));
 688                 dsdb_acl_debug(sd, token,
 689                                req->op.mod.message->dn,
 690                                true,
 691                                10);
 692                 talloc_free(tmp_ctx);
 693                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 694         }
 695
 696         return LDB_SUCCESS;
 697 }
 698
 699 /* ckecks if modifications are allowed on "Member" attribute */
 700 static int acl_check_self_membership(struct ldb_module *module,
 701                                      struct ldb_request *req,
 702                                      struct security_descriptor *sd,
 703                                      struct dom_sid *sid,
 704                                      const struct GUID *oc_guid,
 705                                      const struct dsdb_attribute *attr)
 706 {
 707         int ret;
 708         unsigned int i;
 709         TALLOC_CTX *tmp_ctx = talloc_new(req);
 710         struct ldb_context *ldb = ldb_module_get_ctx(module);
 711         struct ldb_dn *user_dn;
 712         struct ldb_message_element *member_el;
 713         /* if we have wp, we can do whatever we like */
 714         if (acl_check_access_on_attribute(module,
 715                                           req,
 716                                           sd,
 717                                           sid,
 718                                           SEC_ADS_WRITE_PROP,
 719                                           attr) == LDB_SUCCESS) {
 720                 return LDB_SUCCESS;
 721         }
 722         /* if we are adding/deleting ourselves, check for self membership */
 723         ret = dsdb_find_dn_by_sid(ldb, req, acl_user_token(module)->user_sid, &user_dn);
 724         if (ret != LDB_SUCCESS) {
 725                 return ret;
 726         }
 727         member_el = ldb_msg_find_element(req->op.mod.message, "Member");
 728         if (!member_el) {
 729                 return LDB_ERR_OPERATIONS_ERROR;
 730         }
 731         /* user can only remove oneself */
 732         if (member_el->num_values == 0) {
 733                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 734         }
 735         for (i = 0; i < member_el->num_values; i++) {
 736                 if (strcasecmp((const char *)member_el->values[i].data,
 737                                ldb_dn_get_extended_linearized(tmp_ctx, user_dn, 1)) != 0) {
 738                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 739                 }
 740         }
 741         talloc_free(tmp_ctx);
 742         return acl_check_self_write(req, sd, acl_user_token(module),
 743                                     GUID_DRS_SELF_MEMBERSHIP,
 744                                     sid);
 745 }
 746
 747 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
 748 {
 749         int ret;
 750         struct ldb_context *ldb = ldb_module_get_ctx(module);
 751         const struct dsdb_schema *schema;
 752         unsigned int i;
 753         bool modify_sd = false;
 754         const struct GUID *guid;
 755         uint32_t access_granted;
 756         struct object_tree *root = NULL;
 757         struct object_tree *new_node = NULL;
 758         NTSTATUS status;
 759         struct ldb_result *acl_res;
 760         struct security_descriptor *sd;
 761         struct dom_sid *sid = NULL;
 762         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 763         TALLOC_CTX *tmp_ctx = talloc_new(req);
 764         static const char *acl_attrs[] = {
 765                 "nTSecurityDescriptor",
 766                 "objectClass",
 767                 "objectSid",
 768                 NULL
 769         };
 770
 771         if (as_system != NULL) {
 772                 as_system->critical = 0;
 773         }
 774
 775         /* Don't print this debug statement if elements[0].name is going to be NULL */
 776         if(req->op.mod.message->num_elements > 0)
 777         {
 778                 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
 779         }
 780         if (dsdb_module_am_system(module) || as_system) {
 781                 return ldb_next_request(module, req);
 782         }
 783         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 784                 return ldb_next_request(module, req);
 785         }
 786         ret = dsdb_module_search_dn(module, req, &acl_res, req->op.mod.message->dn,
 787                                     acl_attrs, 0);
 788
 789         if (ret != LDB_SUCCESS) {
 790                 return ret;
 791         }
 792
 793         schema = dsdb_get_schema(ldb, acl_res);
 794         if (!schema) {
 795                 talloc_free(acl_res);
 796                 return LDB_ERR_OPERATIONS_ERROR;
 797         }
 798
 799         ret = dsdb_get_sd_from_ldb_message(req, acl_res->msgs[0], &sd);
 800         if (ret != LDB_SUCCESS) {
 801                 DEBUG(10, ("acl_modify: cannot get descriptor\n"));
 802                 return ret;
 803         }
 804         /* Theoretically we pass the check if the object has no sd */
 805         if (!sd) {
 806                 return LDB_SUCCESS;
 807         }
 808
 809         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
 810         if (!guid) {
 811                 DEBUG(10, ("acl_modify: cannot get guid\n"));
 812                 goto fail;
 813         }
 814         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
 815         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 816                                    &root, &new_node)) {
 817                 DEBUG(10, ("acl_modify: cannot add to object tree\n"));
 818                 goto fail;
 819         }
 820         for (i=0; i < req->op.mod.message->num_elements; i++){
 821                 const struct dsdb_attribute *attr;
 822                 /* clearTextPassword is not in schema */
 823                 if (ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
 824                         attr = dsdb_attribute_by_lDAPDisplayName(schema, "unicodePwd");
 825                 } else {
 826                         attr = dsdb_attribute_by_lDAPDisplayName(schema,
 827                                                                  req->op.mod.message->elements[i].name);
 828                 }
 829
 830                 /* This basic attribute existence check with the right errorcode
 831                  * is needed since this module is the first one which requests
 832                  * schema attribute informations.
 833                  * The complete attribute checking is done in the
 834                  * "objectclass_attrs" module behind this one.
 835                  */
 836                 if (!attr) {
 837                         ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
 838                                                req->op.mod.message->elements[i].name,
 839                                                ldb_dn_get_linearized(req->op.mod.message->dn));
 840                         talloc_free(tmp_ctx);
 841                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 842                 }
 843
 844                 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
 845                         modify_sd = true;
 846                 }
 847                 else if (ldb_attr_cmp("Member", req->op.mod.message->elements[i].name) == 0) {
 848                         ret = acl_check_self_membership(module,
 849                                                         req,
 850                                                         sd,
 851                                                         sid,
 852                                                         guid,
 853                                                         attr);
 854                         if (ret != LDB_SUCCESS) {
 855                                 return ret;
 856                         }
 857                 } else {
 858                         if (!insert_in_object_tree(tmp_ctx,
 859                                                    &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
 860                                                    &new_node, &new_node)) {
 861                                 DEBUG(10, ("acl_modify: cannot add to object tree securityGUID\n"));
 862                                 goto fail;
 863                         }
 864
 865                         if (!insert_in_object_tree(tmp_ctx,
 866                                                    &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
 867                                 DEBUG(10, ("acl_modify: cannot add to object tree attributeGUID\n"));
 868                                 goto fail;
 869                         }
 870                 }
 871         }
 872
 873         if (root->num_of_children > 0) {
 874                 status = sec_access_check_ds(sd, acl_user_token(module),
 875                                              SEC_ADS_WRITE_PROP,
 876                                              &access_granted,
 877                                              root,
 878                                              sid);
 879
 880                 if (!NT_STATUS_IS_OK(status)) {
 881                         DEBUG(10, ("Object %s has no write property access\n",
 882                                    ldb_dn_get_linearized(req->op.mod.message->dn)));
 883                         dsdb_acl_debug(sd,
 884                                   acl_user_token(module),
 885                                   req->op.mod.message->dn,
 886                                   true,
 887                                   10);
 888                         talloc_free(tmp_ctx);
 889                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 890                 }
 891         }
 892         if (modify_sd) {
 893                 status = sec_access_check_ds(sd, acl_user_token(module),
 894                                              SEC_STD_WRITE_DAC,
 895                                              &access_granted,
 896                                              NULL,
 897                                              sid);
 898
 899                 if (!NT_STATUS_IS_OK(status)) {
 900                         DEBUG(10, ("Object %s has no write dacl access\n",
 901                                    ldb_dn_get_linearized(req->op.mod.message->dn)));
 902                         dsdb_acl_debug(sd,
 903                                   acl_user_token(module),
 904                                   req->op.mod.message->dn,
 905                                   true,
 906                                   10);
 907                         talloc_free(tmp_ctx);
 908                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 909                 }
 910         }
 911
 912         talloc_free(tmp_ctx);
 913         return ldb_next_request(module, req);
 914 fail:
 915         talloc_free(tmp_ctx);
 916         return LDB_ERR_OPERATIONS_ERROR;
 917 }
 918
 919 /* similar to the modify for the time being.
 920  * We need to concider the special delete tree case, though - TODO */
 921 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
 922 {
 923         int ret;
 924         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
 925         struct ldb_context *ldb;
 926         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 927
 928         if (as_system != NULL) {
 929                 as_system->critical = 0;
 930         }
 931
 932         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
 933         if (dsdb_module_am_system(module) || as_system) {
 934                 return ldb_next_request(module, req);
 935         }
 936
 937         if (ldb_dn_is_special(req->op.del.dn)) {
 938                 return ldb_next_request(module, req);
 939         }
 940         ldb = ldb_module_get_ctx(module);
 941         /* first check if we have delete object right */
 942         ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn, SEC_STD_DELETE, NULL);
 943         if (ret == LDB_SUCCESS) {
 944                 return ldb_next_request(module, req);
 945         }
 946
 947         /* Nope, we don't have delete object. Lets check if we have delete child on the parent */
 948         /* No parent, so check fails */
 949         /* FIXME: this has to be made dynamic at some point */
 950         if ((ldb_dn_compare(req->op.del.dn, (ldb_get_schema_basedn(ldb))) == 0) ||
 951             (ldb_dn_compare(req->op.del.dn, (ldb_get_config_basedn(ldb))) == 0) ||
 952             (ldb_dn_compare(req->op.del.dn, (ldb_get_default_basedn(ldb))) == 0) ||
 953             (ldb_dn_compare(req->op.del.dn, (ldb_get_root_basedn(ldb))) == 0)) {
 954                 DEBUG(10,("acl:deleting an NC\n"));
 955                 return ldb_module_done(req, NULL, NULL, LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS);
 956         }
 957
 958         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_DELETE_CHILD, NULL);
 959         if (ret != LDB_SUCCESS) {
 960                 return ret;
 961         }
 962         return ldb_next_request(module, req);
 963 }
 964
 965 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
 966 {
 967         int ret;
 968         struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
 969         struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
 970         const struct dsdb_schema *schema;
 971         struct ldb_context *ldb;
 972         struct security_descriptor *sd = NULL;
 973         struct dom_sid *sid = NULL;
 974         struct ldb_result *acl_res;
 975         const struct GUID *guid;
 976         struct object_tree *root = NULL;
 977         struct object_tree *new_node = NULL;
 978         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 979         TALLOC_CTX *tmp_ctx = talloc_new(req);
 980         NTSTATUS status;
 981         uint32_t access_granted;
 982         const char *rdn_name;
 983         static const char *acl_attrs[] = {
 984                 "nTSecurityDescriptor",
 985                 "objectClass",
 986                 "objectSid",
 987                 NULL
 988         };
 989
 990         if (as_system != NULL) {
 991                 as_system->critical = 0;
 992         }
 993
 994         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
 995         if (dsdb_module_am_system(module) || as_system) {
 996                 return ldb_next_request(module, req);
 997         }
 998         if (ldb_dn_is_special(req->op.rename.olddn)) {
 999                 return ldb_next_request(module, req);
1000         }
1001         ldb = ldb_module_get_ctx(module);
1002
1003         ret = dsdb_module_search_dn(module, req, &acl_res, req->op.rename.olddn,
1004                                     acl_attrs, DSDB_SEARCH_SHOW_DELETED);
1005         /* we sould be able to find the parent */
1006         if (ret != LDB_SUCCESS) {
1007                 DEBUG(10,("acl: failed to find object %s\n",
1008                           ldb_dn_get_linearized(req->op.rename.olddn)));
1009                 return ret;
1010         }
1011
1012         schema = dsdb_get_schema(ldb, acl_res);
1013         if (!schema) {
1014                 talloc_free(acl_res);
1015                 return LDB_ERR_OPERATIONS_ERROR;
1016         }
1017
1018         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1019         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1020                                    &root, &new_node)) {
1021                 return LDB_ERR_OPERATIONS_ERROR;
1022         };
1023
1024         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1025                                                           "name");
1026         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1027                                    &new_node, &new_node)) {
1028                 return LDB_ERR_OPERATIONS_ERROR;
1029         };
1030
1031         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1032         if (rdn_name == NULL) {
1033                 return LDB_ERR_OPERATIONS_ERROR;
1034         }
1035         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1036                                                           rdn_name);
1037         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1038                                    &new_node, &new_node)) {
1039                 return LDB_ERR_OPERATIONS_ERROR;
1040         };
1041
1042         ret = dsdb_get_sd_from_ldb_message(req, acl_res->msgs[0], &sd);
1043
1044         if (ret != LDB_SUCCESS) {
1045                 return LDB_ERR_OPERATIONS_ERROR;
1046         }
1047         /* Theoretically we pass the check if the object has no sd */
1048         if (!sd) {
1049                 return LDB_SUCCESS;
1050         }
1051         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1052         status = sec_access_check_ds(sd, acl_user_token(module),
1053                                      SEC_ADS_WRITE_PROP,
1054                                      &access_granted,
1055                                      root,
1056                                      sid);
1057
1058         if (!NT_STATUS_IS_OK(status)) {
1059                 DEBUG(10, ("Object %s has no wp on name\n",
1060                            ldb_dn_get_linearized(req->op.rename.olddn)));
1061                 dsdb_acl_debug(sd,
1062                           acl_user_token(module),
1063                           req->op.rename.olddn,
1064                           true,
1065                           10);
1066                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1067         }
1068
1069         if (ldb_dn_compare(oldparent, newparent) == 0) {
1070                 /* regular rename, not move, nothing more to do */
1071                 return ldb_next_request(module, req);
1072         }
1073
1074         /* What exactly to do in this case? It would fail anyway.. */
1075         /* FIXME: this has to be made dynamic at some point */
1076         if ((ldb_dn_compare(req->op.rename.newdn, (ldb_get_schema_basedn(ldb))) == 0) ||
1077             (ldb_dn_compare(req->op.rename.newdn, (ldb_get_config_basedn(ldb))) == 0) ||
1078             (ldb_dn_compare(req->op.rename.newdn, (ldb_get_default_basedn(ldb))) == 0) ||
1079             (ldb_dn_compare(req->op.rename.newdn, (ldb_get_root_basedn(ldb))) == 0)) {
1080                 DEBUG(10,("acl:moving as an NC\n"));
1081                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1082         }
1083         /* new parent should have create child */
1084         talloc_free(tmp_ctx);
1085         tmp_ctx = talloc_new(req);
1086         root = NULL;
1087         new_node = NULL;
1088         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1089         if (!guid) {
1090                 DEBUG(10,("acl:renamed object has no object class\n"));
1091                 return ldb_module_done(req, NULL, NULL,  LDB_ERR_OPERATIONS_ERROR);
1092         }
1093
1094         ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid);
1095         if (ret != LDB_SUCCESS) {
1096                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1097                 return ret;
1098         }
1099         /* do we have delete object on the object? */
1100
1101         status = sec_access_check_ds(sd, acl_user_token(module),
1102                                      SEC_STD_DELETE,
1103                                      &access_granted,
1104                                      NULL,
1105                                      sid);
1106
1107         if (NT_STATUS_IS_OK(status)) {
1108                 return ldb_next_request(module, req);
1109         }
1110         /* what about delete child on the current parent */
1111         ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL);
1112         if (ret != LDB_SUCCESS) {
1113                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1114                 return ldb_module_done(req, NULL, NULL, ret);
1115         }
1116         return ldb_next_request(module, req);
1117 }
1118
1119 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1120 {
1121         struct ldb_context *ldb;
1122         struct acl_context *ac;
1123         struct acl_private *data;
1124         struct ldb_result *acl_res;
1125         static const char *acl_attrs[] = {
1126                 "objectClass",
1127                 "nTSecurityDescriptor",
1128                 "objectSid",
1129                 NULL
1130         };
1131         int ret, i;
1132
1133         ac = talloc_get_type(req->context, struct acl_context);
1134         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1135         ldb = ldb_module_get_ctx(ac->module);
1136
1137         if (!ares) {
1138                 return ldb_module_done(ac->req, NULL, NULL,
1139                                        LDB_ERR_OPERATIONS_ERROR);
1140         }
1141         if (ares->error != LDB_SUCCESS) {
1142                 return ldb_module_done(ac->req, ares->controls,
1143                                        ares->response, ares->error);
1144         }
1145
1146         switch (ares->type) {
1147         case LDB_REPLY_ENTRY:
1148                 if (ac->allowedAttributes
1149                     || ac->allowedChildClasses
1150                     || ac->allowedChildClassesEffective
1151                     || ac->allowedAttributesEffective
1152                     || ac->sDRightsEffective) {
1153                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1154                                                     acl_attrs, 0);
1155                         if (ret != LDB_SUCCESS) {
1156                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1157                         }
1158                         if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1159                                 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1160                                 if (ret != LDB_SUCCESS) {
1161                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1162                                 }
1163                         }
1164                         if (ac->allowedChildClasses) {
1165                                 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1166                                                        ares->message, "allowedChildClasses");
1167                                 if (ret != LDB_SUCCESS) {
1168                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1169                                 }
1170                         }
1171                         if (ac->allowedChildClassesEffective) {
1172                                 ret = acl_childClassesEffective(ac->module, ac->schema,
1173                                                                 acl_res->msgs[0], ares->message, ac);
1174                                 if (ret != LDB_SUCCESS) {
1175                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1176                                 }
1177                         }
1178                         if (ac->sDRightsEffective) {
1179                                 ret = acl_sDRightsEffective(ac->module,
1180                                                             acl_res->msgs[0], ares->message, ac);
1181                                 if (ret != LDB_SUCCESS) {
1182                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1183                                 }
1184                         }
1185                 }
1186                 if (data && data->password_attrs) {
1187                         if (!ac->am_system) {
1188                                 for (i = 0; data->password_attrs[i]; i++) {
1189                                         ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1190                                 }
1191                         }
1192                 }
1193                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1194
1195         case LDB_REPLY_REFERRAL:
1196                 return ldb_module_send_referral(ac->req, ares->referral);
1197
1198         case LDB_REPLY_DONE:
1199                 return ldb_module_done(ac->req, ares->controls,
1200                                        ares->response, LDB_SUCCESS);
1201
1202         }
1203         return LDB_SUCCESS;
1204 }
1205
1206 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1207 {
1208         struct ldb_context *ldb;
1209         struct acl_context *ac;
1210         struct ldb_request *down_req;
1211         struct acl_private *data;
1212         int ret, i;
1213
1214         ldb = ldb_module_get_ctx(module);
1215
1216         ac = talloc_zero(req, struct acl_context);
1217         if (ac == NULL) {
1218                 ldb_oom(ldb);
1219                 return LDB_ERR_OPERATIONS_ERROR;
1220         }
1221         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1222
1223         ac->module = module;
1224         ac->req = req;
1225         ac->am_system = dsdb_module_am_system(module);
1226         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1227         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1228         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1229         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1230         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1231         ac->schema = dsdb_get_schema(ldb, ac);
1232
1233         /* replace any attributes in the parse tree that are private,
1234            so we don't allow a search for 'userPassword=penguin',
1235            just as we would not allow that attribute to be returned */
1236         if (ac->am_system) {
1237                 /* FIXME: We should copy the tree and keep the original unmodified. */
1238                 /* remove password attributes */
1239                 if (data && data->password_attrs) {
1240                         for (i = 0; data->password_attrs[i]; i++) {
1241                                 ldb_parse_tree_attr_replace(req->op.search.tree,
1242                                                             data->password_attrs[i],
1243                                                             "kludgeACLredactedattribute");
1244                         }
1245                 }
1246         }
1247         ret = ldb_build_search_req_ex(&down_req,
1248                                       ldb, ac,
1249                                       req->op.search.base,
1250                                       req->op.search.scope,
1251                                       req->op.search.tree,
1252                                       req->op.search.attrs,
1253                                       req->controls,
1254                                       ac, acl_search_callback,
1255                                       req);
1256         if (ret != LDB_SUCCESS) {
1257                 return ret;
1258         }
1259         /* perform the search */
1260         return ldb_next_request(module, down_req);
1261 }
1262
1263 _PUBLIC_ const struct ldb_module_ops ldb_acl_module_ops = {
1264         .name              = "acl",
1265         .search            = acl_search,
1266         .add               = acl_add,
1267         .modify            = acl_modify,
1268         .del               = acl_delete,
1269         .rename            = acl_rename,
1270         .init_context      = acl_module_init
1271 };