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 static struct security_token *acl_user_token(struct ldb_module *module)
  68 {
  69         struct ldb_context *ldb = ldb_module_get_ctx(module);
  70         struct auth_session_info *session_info
  71                 = (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
  72         if(!session_info) {
  73                 return NULL;
  74         }
  75         return session_info->security_token;
  76 }
  77
  78 /* performs an access check from inside the module stack
  79  * given the dn of the object to be checked, the required access
  80  * guid is either the guid of the extended right, or NULL
  81  */
  82
  83 int dsdb_module_check_access_on_dn(struct ldb_module *module,
  84                                    TALLOC_CTX *mem_ctx,
  85                                    struct ldb_dn *dn,
  86                                    uint32_t access,
  87                                    const struct GUID *guid)
  88 {
  89         int ret;
  90         struct ldb_result *acl_res;
  91         static const char *acl_attrs[] = {
  92                 "nTSecurityDescriptor",
  93                 "objectSid",
  94                 NULL
  95         };
  96         struct ldb_context *ldb = ldb_module_get_ctx(module);
  97         struct auth_session_info *session_info
  98                 = (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
  99         if(!session_info) {
 100                 return ldb_operr(ldb);
 101         }
 102         ret = dsdb_module_search_dn(module, mem_ctx, &acl_res, dn,
 103                                     acl_attrs,
 104                                     DSDB_FLAG_NEXT_MODULE |
 105                                     DSDB_SEARCH_SHOW_DELETED);
 106         if (ret != LDB_SUCCESS) {
 107                 DEBUG(10,("access_check: failed to find object %s\n", ldb_dn_get_linearized(dn)));
 108                 return ret;
 109         }
 110         return dsdb_check_access_on_dn_internal(ldb, acl_res,
 111                                                 mem_ctx,
 112                                                 session_info->security_token,
 113                                                 dn,
 114                                                 access,
 115                                                 guid);
 116 }
 117
 118
 119 static int acl_module_init(struct ldb_module *module)
 120 {
 121         struct ldb_context *ldb;
 122         struct acl_private *data;
 123         int ret, i;
 124         TALLOC_CTX *mem_ctx;
 125         static const char *attrs[] = { "passwordAttribute", NULL };
 126         struct ldb_result *res;
 127         struct ldb_message *msg;
 128         struct ldb_message_element *password_attributes;
 129
 130         ldb = ldb_module_get_ctx(module);
 131
 132         ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
 133         if (ret != LDB_SUCCESS) {
 134                 ldb_debug(ldb, LDB_DEBUG_ERROR,
 135                           "acl_module_init: Unable to register control with rootdse!\n");
 136                 return ldb_operr(ldb);
 137         }
 138
 139         data = talloc(module, struct acl_private);
 140         if (data == NULL) {
 141                 return ldb_oom(ldb);
 142         }
 143
 144         data->password_attrs = NULL;
 145         data->acl_perform = lpcfg_parm_bool(ldb_get_opaque(ldb, "loadparm"),
 146                                          NULL, "acl", "perform", false);
 147         ldb_module_set_private(module, data);
 148
 149         mem_ctx = talloc_new(module);
 150         if (!mem_ctx) {
 151                 return ldb_oom(ldb);
 152         }
 153
 154         ret = dsdb_module_search_dn(module, mem_ctx, &res,
 155                                     ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
 156                                     attrs,
 157                                     DSDB_FLAG_NEXT_MODULE);
 158         if (ret != LDB_SUCCESS) {
 159                 goto done;
 160         }
 161         if (res->count == 0) {
 162                 goto done;
 163         }
 164
 165         if (res->count > 1) {
 166                 talloc_free(mem_ctx);
 167                 return LDB_ERR_CONSTRAINT_VIOLATION;
 168         }
 169
 170         msg = res->msgs[0];
 171
 172         password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
 173         if (!password_attributes) {
 174                 goto done;
 175         }
 176         data->password_attrs = talloc_array(data, const char *, password_attributes->num_values + 1);
 177         if (!data->password_attrs) {
 178                 talloc_free(mem_ctx);
 179                 return ldb_oom(ldb);
 180         }
 181         for (i=0; i < password_attributes->num_values; i++) {
 182                 data->password_attrs[i] = (const char *)password_attributes->values[i].data;
 183                 talloc_steal(data->password_attrs, password_attributes->values[i].data);
 184         }
 185         data->password_attrs[i] = NULL;
 186
 187 done:
 188         talloc_free(mem_ctx);
 189         return ldb_next_init(module);
 190 }
 191
 192 static const struct GUID *get_oc_guid_from_message(struct ldb_module *module,
 193                                                    const struct dsdb_schema *schema,
 194                                                    struct ldb_message *msg)
 195 {
 196         struct ldb_message_element *oc_el;
 197
 198         oc_el = ldb_msg_find_element(msg, "objectClass");
 199         if (!oc_el) {
 200                 return NULL;
 201         }
 202
 203         return class_schemaid_guid_by_lDAPDisplayName(schema,
 204                                                       (char *)oc_el->values[oc_el->num_values-1].data);
 205 }
 206
 207 static int acl_check_access_on_attribute(struct ldb_module *module,
 208                                          TALLOC_CTX *mem_ctx,
 209                                          struct security_descriptor *sd,
 210                                          struct dom_sid *rp_sid,
 211                                          uint32_t access,
 212                                          const struct dsdb_attribute *attr)
 213 {
 214         int ret;
 215         NTSTATUS status;
 216         uint32_t access_granted;
 217         struct object_tree *root = NULL;
 218         struct object_tree *new_node = NULL;
 219         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 220         struct security_token *token = acl_user_token(module);
 221         if (attr) {
 222                 if (!GUID_all_zero(&attr->attributeSecurityGUID)) {
 223                         if (!insert_in_object_tree(tmp_ctx,
 224                                                    &attr->attributeSecurityGUID, access,
 225                                                    &root, &new_node)) {
 226                                 DEBUG(10, ("acl_search: cannot add to object tree securityGUID\n"));
 227                                 goto fail;
 228                         }
 229
 230                         if (!insert_in_object_tree(tmp_ctx,
 231                                                    &attr->schemaIDGUID, access, &new_node, &new_node)) {
 232                                 DEBUG(10, ("acl_search: cannot add to object tree attributeGUID\n"));
 233                                 goto fail;
 234                         }
 235                 }
 236                 else {
 237                         if (!insert_in_object_tree(tmp_ctx,
 238                                                    &attr->schemaIDGUID, access, &root, &new_node)) {
 239                                 DEBUG(10, ("acl_search: cannot add to object tree attributeGUID\n"));
 240                                 goto fail;
 241                         }
 242                 }
 243         }
 244         status = sec_access_check_ds(sd, token,
 245                                      access,
 246                                      &access_granted,
 247                                      root,
 248                                      rp_sid);
 249         if (!NT_STATUS_IS_OK(status)) {
 250                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 251         }
 252         else {
 253                 ret = LDB_SUCCESS;
 254         }
 255         talloc_free(tmp_ctx);
 256         return ret;
 257 fail:
 258         talloc_free(tmp_ctx);
 259         return ldb_operr(ldb_module_get_ctx(module));
 260 }
 261
 262 static int acl_check_access_on_class(struct ldb_module *module,
 263                                      const struct dsdb_schema *schema,
 264                                      TALLOC_CTX *mem_ctx,
 265                                      struct security_descriptor *sd,
 266                                      struct dom_sid *rp_sid,
 267                                      uint32_t access,
 268                                      const char *class_name)
 269 {
 270         int ret;
 271         NTSTATUS status;
 272         uint32_t access_granted;
 273         struct object_tree *root = NULL;
 274         struct object_tree *new_node = NULL;
 275         const struct GUID *guid;
 276         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 277         struct security_token *token = acl_user_token(module);
 278         if (class_name) {
 279                 guid = class_schemaid_guid_by_lDAPDisplayName(schema, class_name);
 280                 if (!guid) {
 281                         DEBUG(10, ("acl_search: cannot find class %s\n",
 282                                    class_name));
 283                         goto fail;
 284                 }
 285                 if (!insert_in_object_tree(tmp_ctx,
 286                                            guid, access,
 287                                            &root, &new_node)) {
 288                         DEBUG(10, ("acl_search: cannot add to object tree guid\n"));
 289                         goto fail;
 290                 }
 291         }
 292         status = sec_access_check_ds(sd, token,
 293                                      access,
 294                                      &access_granted,
 295                                      root,
 296                                      rp_sid);
 297         if (!NT_STATUS_IS_OK(status)) {
 298                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 299         }
 300         else {
 301                 ret = LDB_SUCCESS;
 302         }
 303         return ret;
 304 fail:
 305         return ldb_operr(ldb_module_get_ctx(module));
 306 }
 307
 308 static int acl_allowedAttributes(struct ldb_module *module,
 309                                  const struct dsdb_schema *schema,
 310                                  struct ldb_message *sd_msg,
 311                                  struct ldb_message *msg,
 312                                  struct acl_context *ac)
 313 {
 314         struct ldb_message_element *oc_el;
 315         struct ldb_context *ldb = ldb_module_get_ctx(module);
 316         TALLOC_CTX *mem_ctx;
 317         const char **attr_list;
 318         int i, ret;
 319
 320         /* If we don't have a schema yet, we can't do anything... */
 321         if (schema == NULL) {
 322                 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 323                 return LDB_ERR_OPERATIONS_ERROR;
 324         }
 325
 326         /* Must remove any existing attribute */
 327         if (ac->allowedAttributes) {
 328                 ldb_msg_remove_attr(msg, "allowedAttributes");
 329         }
 330
 331         mem_ctx = talloc_new(msg);
 332         if (!mem_ctx) {
 333                 return ldb_oom(ldb);
 334         }
 335
 336         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 337         attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
 338         if (!attr_list) {
 339                 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
 340                 talloc_free(mem_ctx);
 341                 return LDB_ERR_OPERATIONS_ERROR;
 342         }
 343         if (ac->allowedAttributes) {
 344                 for (i=0; attr_list && attr_list[i]; i++) {
 345                         ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
 346                 }
 347         }
 348         if (ac->allowedAttributesEffective) {
 349                 struct security_descriptor *sd;
 350                 struct dom_sid *sid = NULL;
 351                 struct ldb_control *as_system = ldb_request_get_control(ac->req,
 352                                                                         LDB_CONTROL_AS_SYSTEM_OID);
 353
 354                 if (as_system != NULL) {
 355                         as_system->critical = 0;
 356                 }
 357
 358                 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
 359                 if (ac->am_system || as_system) {
 360                         for (i=0; attr_list && attr_list[i]; i++) {
 361                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 362                         }
 363                         return LDB_SUCCESS;
 364                 }
 365
 366                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), mem_ctx, sd_msg, &sd);
 367
 368                 if (ret != LDB_SUCCESS) {
 369                         return ret;
 370                 }
 371
 372                 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
 373                 for (i=0; attr_list && attr_list[i]; i++) {
 374                         const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
 375                                                                                         attr_list[i]);
 376                         if (!attr) {
 377                                 return ldb_operr(ldb);
 378                         }
 379                         /* remove constructed attributes */
 380                         if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
 381                             || attr->systemOnly
 382                             || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
 383                                 continue;
 384                         }
 385                         ret = acl_check_access_on_attribute(module,
 386                                                             msg,
 387                                                             sd,
 388                                                             sid,
 389                                                             SEC_ADS_WRITE_PROP,
 390                                                             attr);
 391                         if (ret == LDB_SUCCESS) {
 392                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 393                         }
 394                 }
 395         }
 396         return LDB_SUCCESS;
 397 }
 398
 399 static int acl_childClasses(struct ldb_module *module,
 400                             const struct dsdb_schema *schema,
 401                             struct ldb_message *sd_msg,
 402                             struct ldb_message *msg,
 403                             const char *attrName)
 404 {
 405         struct ldb_message_element *oc_el;
 406         struct ldb_message_element *allowedClasses;
 407         const struct dsdb_class *sclass;
 408         unsigned int i, j;
 409         int ret;
 410
 411         /* If we don't have a schema yet, we can't do anything... */
 412         if (schema == NULL) {
 413                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 414                 return LDB_ERR_OPERATIONS_ERROR;
 415         }
 416
 417         /* Must remove any existing attribute, or else confusion reins */
 418         ldb_msg_remove_attr(msg, attrName);
 419         ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
 420         if (ret != LDB_SUCCESS) {
 421                 return ret;
 422         }
 423
 424         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 425
 426         for (i=0; oc_el && i < oc_el->num_values; i++) {
 427                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 428                 if (!sclass) {
 429                         /* We don't know this class?  what is going on? */
 430                         continue;
 431                 }
 432
 433                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 434                         ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
 435                 }
 436         }
 437         if (allowedClasses->num_values > 1) {
 438                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 439                 for (i=1 ; i < allowedClasses->num_values; i++) {
 440                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 441                         struct ldb_val *val2 = &allowedClasses->values[i];
 442                         if (data_blob_cmp(val1, val2) == 0) {
 443                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
 444                                 allowedClasses->num_values--;
 445                                 i--;
 446                         }
 447                 }
 448         }
 449
 450         return LDB_SUCCESS;
 451 }
 452
 453 static int acl_childClassesEffective(struct ldb_module *module,
 454                                      const struct dsdb_schema *schema,
 455                                      struct ldb_message *sd_msg,
 456                                      struct ldb_message *msg,
 457                                      struct acl_context *ac)
 458 {
 459         struct ldb_message_element *oc_el;
 460         struct ldb_message_element *allowedClasses = NULL;
 461         const struct dsdb_class *sclass;
 462         struct security_descriptor *sd;
 463         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 464                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 465         struct dom_sid *sid = NULL;
 466         unsigned int i, j;
 467         int ret;
 468
 469         if (as_system != NULL) {
 470                 as_system->critical = 0;
 471         }
 472
 473         if (ac->am_system || as_system) {
 474                 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
 475         }
 476
 477         /* If we don't have a schema yet, we can't do anything... */
 478         if (schema == NULL) {
 479                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 480                 return LDB_ERR_OPERATIONS_ERROR;
 481         }
 482
 483         /* Must remove any existing attribute, or else confusion reins */
 484         ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
 485
 486         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 487         ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 488         if (ret != LDB_SUCCESS) {
 489                 return ret;
 490         }
 491
 492         sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 493         for (i=0; oc_el && i < oc_el->num_values; i++) {
 494                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 495                 if (!sclass) {
 496                         /* We don't know this class?  what is going on? */
 497                         continue;
 498                 }
 499
 500                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 501                         ret = acl_check_access_on_class(module,
 502                                                         schema,
 503                                                         msg,
 504                                                         sd,
 505                                                         sid,
 506                                                         SEC_ADS_CREATE_CHILD,
 507                                                         sclass->possibleInferiors[j]);
 508                         if (ret == LDB_SUCCESS) {
 509                                 ldb_msg_add_string(msg, "allowedChildClassesEffective",
 510                                                    sclass->possibleInferiors[j]);
 511                         }
 512                 }
 513         }
 514         allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
 515         if (!allowedClasses) {
 516                 return LDB_SUCCESS;
 517         }
 518
 519         if (allowedClasses->num_values > 1) {
 520                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 521                 for (i=1 ; i < allowedClasses->num_values; i++) {
 522                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 523                         struct ldb_val *val2 = &allowedClasses->values[i];
 524                         if (data_blob_cmp(val1, val2) == 0) {
 525                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
 526                                 allowedClasses->num_values--;
 527                                 i--;
 528                         }
 529                 }
 530         }
 531         return LDB_SUCCESS;
 532 }
 533
 534 static int acl_sDRightsEffective(struct ldb_module *module,
 535                                  struct ldb_message *sd_msg,
 536                                  struct ldb_message *msg,
 537                                  struct acl_context *ac)
 538 {
 539         struct ldb_message_element *rightsEffective;
 540         int ret;
 541         struct security_descriptor *sd;
 542         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 543                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 544         struct dom_sid *sid = NULL;
 545         uint32_t flags = 0;
 546
 547         if (as_system != NULL) {
 548                 as_system->critical = 0;
 549         }
 550
 551         /* Must remove any existing attribute, or else confusion reins */
 552         ldb_msg_remove_attr(msg, "sDRightsEffective");
 553         ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
 554         if (ret != LDB_SUCCESS) {
 555                 return ret;
 556         }
 557         if (ac->am_system || as_system) {
 558                 flags = SECINFO_OWNER | SECINFO_GROUP |  SECINFO_SACL |  SECINFO_DACL;
 559         }
 560         else {
 561                 /* Get the security descriptor from the message */
 562                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 563                 if (ret != LDB_SUCCESS) {
 564                         return ret;
 565                 }
 566                 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 567                 ret = acl_check_access_on_attribute(module,
 568                                                     msg,
 569                                                     sd,
 570                                                     sid,
 571                                                     SEC_STD_WRITE_OWNER,
 572                                                     NULL);
 573                 if (ret == LDB_SUCCESS) {
 574                         flags |= SECINFO_OWNER | SECINFO_GROUP;
 575                 }
 576                 ret = acl_check_access_on_attribute(module,
 577                                                     msg,
 578                                                     sd,
 579                                                     sid,
 580                                                     SEC_STD_WRITE_DAC,
 581                                                     NULL);
 582                 if (ret == LDB_SUCCESS) {
 583                         flags |= SECINFO_DACL;
 584                 }
 585                 ret = acl_check_access_on_attribute(module,
 586                                                     msg,
 587                                                     sd,
 588                                                     sid,
 589                                                     SEC_FLAG_SYSTEM_SECURITY,
 590                                                     NULL);
 591                 if (ret == LDB_SUCCESS) {
 592                         flags |= SECINFO_SACL;
 593                 }
 594         }
 595         ldb_msg_add_fmt(msg, "sDRightsEffective", "%u", flags);
 596         return LDB_SUCCESS;
 597 }
 598
 599 static int acl_add(struct ldb_module *module, struct ldb_request *req)
 600 {
 601         int ret;
 602         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
 603         struct ldb_context *ldb;
 604         const struct dsdb_schema *schema;
 605         struct ldb_message_element *oc_el;
 606         const struct GUID *guid;
 607         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 608
 609         if (as_system != NULL) {
 610                 as_system->critical = 0;
 611         }
 612
 613         if (dsdb_module_am_system(module) || as_system) {
 614                 return ldb_next_request(module, req);
 615         }
 616
 617         if (ldb_dn_is_special(req->op.add.message->dn)) {
 618                 return ldb_next_request(module, req);
 619         }
 620         ldb = ldb_module_get_ctx(module);
 621         /* Creating an NC. There is probably something we should do here,
 622          * but we will establish that later */
 623         /* FIXME: this has to be made dynamic at some point */
 624         if ((ldb_dn_compare(req->op.add.message->dn, (ldb_get_schema_basedn(ldb))) == 0) ||
 625             (ldb_dn_compare(req->op.add.message->dn, (ldb_get_config_basedn(ldb))) == 0) ||
 626             (ldb_dn_compare(req->op.add.message->dn, (ldb_get_default_basedn(ldb))) == 0)) {
 627                 return ldb_next_request(module, req);
 628         }
 629
 630         schema = dsdb_get_schema(ldb, req);
 631         if (!schema) {
 632                 return ldb_operr(ldb);
 633         }
 634
 635         oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
 636         if (!oc_el || oc_el->num_values == 0) {
 637                 DEBUG(10,("acl:operation error %s\n", ldb_dn_get_linearized(req->op.add.message->dn)));
 638                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 639         }
 640
 641         guid = class_schemaid_guid_by_lDAPDisplayName(schema,
 642                                                       (char *)oc_el->values[oc_el->num_values-1].data);
 643         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid);
 644         if (ret != LDB_SUCCESS) {
 645                 return ret;
 646         }
 647         return ldb_next_request(module, req);
 648 }
 649
 650 /* checks for validated writes */
 651 static int acl_check_extended_right(TALLOC_CTX *mem_ctx,
 652                                     struct security_descriptor *sd,
 653                                     struct security_token *token,
 654                                     const char *ext_right,
 655                                     uint32_t right_type,
 656                                     struct dom_sid *sid)
 657 {
 658         struct GUID right;
 659         NTSTATUS status;
 660         uint32_t access_granted;
 661         struct object_tree *root = NULL;
 662         struct object_tree *new_node = NULL;
 663         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 664
 665         GUID_from_string(ext_right, &right);
 666
 667         if (!insert_in_object_tree(tmp_ctx, &right, right_type,
 668                                    &root, &new_node)) {
 669                 DEBUG(10, ("acl_ext_right: cannot add to object tree\n"));
 670                 talloc_free(tmp_ctx);
 671                 return LDB_ERR_OPERATIONS_ERROR;
 672         }
 673         status = sec_access_check_ds(sd, token,
 674                                      right_type,
 675                                      &access_granted,
 676                                      root,
 677                                      sid);
 678
 679         if (!NT_STATUS_IS_OK(status)) {
 680                 talloc_free(tmp_ctx);
 681                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 682         }
 683         talloc_free(tmp_ctx);
 684         return LDB_SUCCESS;
 685 }
 686
 687
 688 /* ckecks if modifications are allowed on "Member" attribute */
 689 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
 690                                      struct ldb_module *module,
 691                                      struct ldb_request *req,
 692                                      struct security_descriptor *sd,
 693                                      struct dom_sid *sid,
 694                                      const struct GUID *oc_guid,
 695                                      const struct dsdb_attribute *attr)
 696 {
 697         int ret;
 698         unsigned int i;
 699         struct ldb_context *ldb = ldb_module_get_ctx(module);
 700         struct ldb_dn *user_dn;
 701         struct ldb_message_element *member_el;
 702         /* if we have wp, we can do whatever we like */
 703         if (acl_check_access_on_attribute(module,
 704                                           mem_ctx,
 705                                           sd,
 706                                           sid,
 707                                           SEC_ADS_WRITE_PROP,
 708                                           attr) == LDB_SUCCESS) {
 709                 return LDB_SUCCESS;
 710         }
 711         /* if we are adding/deleting ourselves, check for self membership */
 712         ret = dsdb_find_dn_by_sid(ldb, mem_ctx, acl_user_token(module)->user_sid, &user_dn);
 713         if (ret != LDB_SUCCESS) {
 714                 return ret;
 715         }
 716         member_el = ldb_msg_find_element(req->op.mod.message, "member");
 717         if (!member_el) {
 718                 return ldb_operr(ldb);
 719         }
 720         /* user can only remove oneself */
 721         if (member_el->num_values == 0) {
 722                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 723         }
 724         for (i = 0; i < member_el->num_values; i++) {
 725                 if (strcasecmp((const char *)member_el->values[i].data,
 726                                ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
 727                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 728                 }
 729         }
 730         ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
 731                                        GUID_DRS_SELF_MEMBERSHIP,
 732                                        SEC_ADS_SELF_WRITE,
 733                                        sid);
 734         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 735                 dsdb_acl_debug(sd, acl_user_token(module),
 736                                req->op.mod.message->dn,
 737                                true,
 738                                10);
 739         }
 740         return ret;
 741 }
 742
 743 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
 744                                      struct ldb_module *module,
 745                                      struct ldb_request *req,
 746                                      struct security_descriptor *sd,
 747                                      struct dom_sid *sid,
 748                                      const struct GUID *oc_guid)
 749 {
 750         int ret = LDB_SUCCESS;
 751         unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
 752         struct ldb_message_element *el;
 753         struct ldb_message *msg;
 754         const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
 755                                         "unicodePwd", "dBCSPwd", NULL }, **l;
 756         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 757
 758         msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
 759         if (msg == NULL) {
 760                 return ldb_module_oom(module);
 761         }
 762         for (l = passwordAttrs; *l != NULL; l++) {
 763                 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
 764                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
 765                                 ++del_attr_cnt;
 766                         }
 767                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
 768                                 ++add_attr_cnt;
 769                         }
 770                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
 771                                 ++rep_attr_cnt;
 772                         }
 773                         ldb_msg_remove_element(msg, el);
 774                 }
 775         }
 776         /* a single delete will be handled by password hash
 777            later in the stack, so we let it though here */
 778         if (del_attr_cnt > 0 && add_attr_cnt == 0) {
 779                 talloc_free(tmp_ctx);
 780                 return LDB_SUCCESS;
 781         }
 782
 783         if (ldb_request_get_control(req,
 784                                     DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
 785                 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
 786                  * have a user password change and not a set as the message
 787                  * looks like. In it's value blob it contains the NT and/or LM
 788                  * hash of the old password specified by the user.
 789                  * This control is used by the SAMR and "kpasswd" password
 790                  * change mechanisms. */
 791                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 792                                                GUID_DRS_USER_CHANGE_PASSWORD,
 793                                                SEC_ADS_CONTROL_ACCESS,
 794                                                sid);
 795         }
 796         else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
 797                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 798                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
 799                                                SEC_ADS_CONTROL_ACCESS,
 800                                                sid);
 801         }
 802         else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
 803                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 804                                                GUID_DRS_USER_CHANGE_PASSWORD,
 805                                                SEC_ADS_CONTROL_ACCESS,
 806                                                sid);
 807                 /* Very strange, but we get constraint violation in this case */
 808                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 809                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
 810                 }
 811         }
 812         if (ret != LDB_SUCCESS) {
 813                 dsdb_acl_debug(sd, acl_user_token(module),
 814                                req->op.mod.message->dn,
 815                                true,
 816                                10);
 817         }
 818         talloc_free(tmp_ctx);
 819         return ret;
 820 }
 821
 822 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
 823 {
 824         int ret;
 825         struct ldb_context *ldb = ldb_module_get_ctx(module);
 826         const struct dsdb_schema *schema;
 827         unsigned int i;
 828         const struct GUID *guid;
 829         uint32_t access_granted;
 830         struct object_tree *root = NULL;
 831         struct object_tree *new_node = NULL;
 832         NTSTATUS status;
 833         struct ldb_result *acl_res;
 834         struct security_descriptor *sd;
 835         struct dom_sid *sid = NULL;
 836         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 837         TALLOC_CTX *tmp_ctx = talloc_new(req);
 838         static const char *acl_attrs[] = {
 839                 "nTSecurityDescriptor",
 840                 "objectClass",
 841                 "objectSid",
 842                 NULL
 843         };
 844
 845         if (as_system != NULL) {
 846                 as_system->critical = 0;
 847         }
 848
 849         /* Don't print this debug statement if elements[0].name is going to be NULL */
 850         if(req->op.mod.message->num_elements > 0)
 851         {
 852                 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
 853         }
 854         if (dsdb_module_am_system(module) || as_system) {
 855                 return ldb_next_request(module, req);
 856         }
 857         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 858                 return ldb_next_request(module, req);
 859         }
 860         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
 861                                     acl_attrs,
 862                                     DSDB_FLAG_NEXT_MODULE);
 863
 864         if (ret != LDB_SUCCESS) {
 865                 goto fail;
 866         }
 867
 868         schema = dsdb_get_schema(ldb, tmp_ctx);
 869         if (!schema) {
 870                 ret = LDB_ERR_OPERATIONS_ERROR;
 871                 goto fail;
 872         }
 873
 874         ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
 875         if (ret != LDB_SUCCESS) {
 876                 DEBUG(10, ("acl_modify: cannot get descriptor\n"));
 877                 goto fail;
 878         }
 879         /* Theoretically we pass the check if the object has no sd */
 880         if (!sd) {
 881                 goto success;
 882         }
 883
 884         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
 885         if (!guid) {
 886                 DEBUG(10, ("acl_modify: cannot get guid\n"));
 887                 goto fail;
 888         }
 889         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
 890         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 891                                    &root, &new_node)) {
 892                 DEBUG(10, ("acl_modify: cannot add to object tree\n"));
 893                 goto fail;
 894         }
 895         for (i=0; i < req->op.mod.message->num_elements; i++){
 896                 const struct dsdb_attribute *attr;
 897                 attr = dsdb_attribute_by_lDAPDisplayName(schema,
 898                                                                  req->op.mod.message->elements[i].name);
 899
 900                 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
 901                         status = sec_access_check_ds(sd, acl_user_token(module),
 902                                              SEC_STD_WRITE_DAC,
 903                                              &access_granted,
 904                                              NULL,
 905                                              sid);
 906
 907                         if (!NT_STATUS_IS_OK(status)) {
 908                                 DEBUG(10, ("Object %s has no write dacl access\n",
 909                                            ldb_dn_get_linearized(req->op.mod.message->dn)));
 910                                 dsdb_acl_debug(sd,
 911                                                acl_user_token(module),
 912                                                req->op.mod.message->dn,
 913                                                true,
 914                                                10);
 915                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 916                                 goto fail;
 917                         }
 918                 }
 919                 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
 920                         ret = acl_check_self_membership(tmp_ctx,
 921                                                         module,
 922                                                         req,
 923                                                         sd,
 924                                                         sid,
 925                                                         guid,
 926                                                         attr);
 927                         if (ret != LDB_SUCCESS) {
 928                                 goto fail;
 929                         }
 930                 }
 931                 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
 932                         /* this one is not affected by any rights, we should let it through
 933                            so that passwords_hash returns the correct error */
 934                         continue;
 935                 }
 936                 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
 937                          ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0 ||
 938                          ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
 939                         ret = acl_check_password_rights(tmp_ctx,
 940                                                         module,
 941                                                         req,
 942                                                         sd,
 943                                                         sid,
 944                                                         guid);
 945                         if (ret != LDB_SUCCESS) {
 946                                 goto fail;
 947                         }
 948                 } else {
 949
 950                 /* This basic attribute existence check with the right errorcode
 951                  * is needed since this module is the first one which requests
 952                  * schema attribute informations.
 953                  * The complete attribute checking is done in the
 954                  * "objectclass_attrs" module behind this one.
 955                  */
 956                         if (!attr) {
 957                                 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
 958                                                        req->op.mod.message->elements[i].name,
 959                                                ldb_dn_get_linearized(req->op.mod.message->dn));
 960                                 ret =  LDB_ERR_NO_SUCH_ATTRIBUTE;
 961                                 goto fail;
 962                         }
 963                         if (!insert_in_object_tree(tmp_ctx,
 964                                                    &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
 965                                                    &new_node, &new_node)) {
 966                                 DEBUG(10, ("acl_modify: cannot add to object tree securityGUID\n"));
 967                                 ret = LDB_ERR_OPERATIONS_ERROR;
 968                                 goto fail;
 969                         }
 970
 971                         if (!insert_in_object_tree(tmp_ctx,
 972                                                    &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
 973                                 DEBUG(10, ("acl_modify: cannot add to object tree attributeGUID\n"));
 974                                 ret = LDB_ERR_OPERATIONS_ERROR;
 975                                 goto fail;
 976                         }
 977                 }
 978         }
 979
 980         if (root->num_of_children > 0) {
 981                 status = sec_access_check_ds(sd, acl_user_token(module),
 982                                              SEC_ADS_WRITE_PROP,
 983                                              &access_granted,
 984                                              root,
 985                                              sid);
 986
 987                 if (!NT_STATUS_IS_OK(status)) {
 988                         DEBUG(10, ("Object %s has no write property access\n",
 989                                    ldb_dn_get_linearized(req->op.mod.message->dn)));
 990                         dsdb_acl_debug(sd,
 991                                   acl_user_token(module),
 992                                   req->op.mod.message->dn,
 993                                   true,
 994                                   10);
 995                         ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 996                         goto fail;
 997                 }
 998         }
 999
1000 success:
1001         talloc_free(tmp_ctx);
1002         return ldb_next_request(module, req);
1003 fail:
1004         talloc_free(tmp_ctx);
1005         return ret;
1006 }
1007
1008 /* similar to the modify for the time being.
1009  * We need to concider the special delete tree case, though - TODO */
1010 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1011 {
1012         int ret;
1013         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
1014         struct ldb_context *ldb;
1015         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1016
1017         if (as_system != NULL) {
1018                 as_system->critical = 0;
1019         }
1020
1021         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1022         if (dsdb_module_am_system(module) || as_system) {
1023                 return ldb_next_request(module, req);
1024         }
1025
1026         if (ldb_dn_is_special(req->op.del.dn)) {
1027                 return ldb_next_request(module, req);
1028         }
1029         ldb = ldb_module_get_ctx(module);
1030         /* first check if we have delete object right */
1031         ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn, SEC_STD_DELETE, NULL);
1032         if (ret == LDB_SUCCESS) {
1033                 return ldb_next_request(module, req);
1034         }
1035
1036         /* Nope, we don't have delete object. Lets check if we have delete child on the parent */
1037         /* No parent, so check fails */
1038         /* FIXME: this has to be made dynamic at some point */
1039         if ((ldb_dn_compare(req->op.del.dn, (ldb_get_schema_basedn(ldb))) == 0) ||
1040             (ldb_dn_compare(req->op.del.dn, (ldb_get_config_basedn(ldb))) == 0) ||
1041             (ldb_dn_compare(req->op.del.dn, (ldb_get_default_basedn(ldb))) == 0)) {
1042                 DEBUG(10,("acl:deleting an NC\n"));
1043                 return ldb_module_done(req, NULL, NULL, LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS);
1044         }
1045
1046         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_DELETE_CHILD, NULL);
1047         if (ret != LDB_SUCCESS) {
1048                 return ret;
1049         }
1050         return ldb_next_request(module, req);
1051 }
1052
1053 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1054 {
1055         int ret;
1056         struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
1057         struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
1058         const struct dsdb_schema *schema;
1059         struct ldb_context *ldb;
1060         struct security_descriptor *sd = NULL;
1061         struct dom_sid *sid = NULL;
1062         struct ldb_result *acl_res;
1063         const struct GUID *guid;
1064         struct object_tree *root = NULL;
1065         struct object_tree *new_node = NULL;
1066         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1067         TALLOC_CTX *tmp_ctx = talloc_new(req);
1068         NTSTATUS status;
1069         uint32_t access_granted;
1070         const char *rdn_name;
1071         static const char *acl_attrs[] = {
1072                 "nTSecurityDescriptor",
1073                 "objectClass",
1074                 "objectSid",
1075                 NULL
1076         };
1077
1078         if (as_system != NULL) {
1079                 as_system->critical = 0;
1080         }
1081
1082         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1083         if (dsdb_module_am_system(module) || as_system) {
1084                 return ldb_next_request(module, req);
1085         }
1086         if (ldb_dn_is_special(req->op.rename.olddn)) {
1087                 return ldb_next_request(module, req);
1088         }
1089         ldb = ldb_module_get_ctx(module);
1090
1091         ret = dsdb_module_search_dn(module, req, &acl_res, req->op.rename.olddn,
1092                                     acl_attrs,
1093                                     DSDB_FLAG_NEXT_MODULE |
1094                                     DSDB_SEARCH_SHOW_DELETED);
1095         /* we sould be able to find the parent */
1096         if (ret != LDB_SUCCESS) {
1097                 DEBUG(10,("acl: failed to find object %s\n",
1098                           ldb_dn_get_linearized(req->op.rename.olddn)));
1099                 return ret;
1100         }
1101
1102         schema = dsdb_get_schema(ldb, acl_res);
1103         if (!schema) {
1104                 talloc_free(acl_res);
1105                 return ldb_operr(ldb);
1106         }
1107
1108         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1109         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1110                                    &root, &new_node)) {
1111                 return ldb_operr(ldb);
1112         };
1113
1114         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1115                                                           "name");
1116         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1117                                    &new_node, &new_node)) {
1118                 return ldb_operr(ldb);
1119         };
1120
1121         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1122         if (rdn_name == NULL) {
1123                 return ldb_operr(ldb);
1124         }
1125         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1126                                                           rdn_name);
1127         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1128                                    &new_node, &new_node)) {
1129                 return ldb_operr(ldb);
1130         };
1131
1132         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1133
1134         if (ret != LDB_SUCCESS) {
1135                 return ldb_operr(ldb);
1136         }
1137         /* Theoretically we pass the check if the object has no sd */
1138         if (!sd) {
1139                 return LDB_SUCCESS;
1140         }
1141         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1142         status = sec_access_check_ds(sd, acl_user_token(module),
1143                                      SEC_ADS_WRITE_PROP,
1144                                      &access_granted,
1145                                      root,
1146                                      sid);
1147
1148         if (!NT_STATUS_IS_OK(status)) {
1149                 DEBUG(10, ("Object %s has no wp on name\n",
1150                            ldb_dn_get_linearized(req->op.rename.olddn)));
1151                 dsdb_acl_debug(sd,
1152                           acl_user_token(module),
1153                           req->op.rename.olddn,
1154                           true,
1155                           10);
1156                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1157         }
1158
1159         if (ldb_dn_compare(oldparent, newparent) == 0) {
1160                 /* regular rename, not move, nothing more to do */
1161                 return ldb_next_request(module, req);
1162         }
1163
1164         /* What exactly to do in this case? It would fail anyway.. */
1165         /* FIXME: this has to be made dynamic at some point */
1166         if ((ldb_dn_compare(req->op.rename.newdn, (ldb_get_schema_basedn(ldb))) == 0) ||
1167             (ldb_dn_compare(req->op.rename.newdn, (ldb_get_config_basedn(ldb))) == 0) ||
1168             (ldb_dn_compare(req->op.rename.newdn, (ldb_get_default_basedn(ldb))) == 0)) {
1169                 DEBUG(10,("acl:moving as an NC\n"));
1170                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1171         }
1172         /* new parent should have create child */
1173         talloc_free(tmp_ctx);
1174         tmp_ctx = talloc_new(req);
1175         root = NULL;
1176         new_node = NULL;
1177         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1178         if (!guid) {
1179                 DEBUG(10,("acl:renamed object has no object class\n"));
1180                 return ldb_module_done(req, NULL, NULL,  LDB_ERR_OPERATIONS_ERROR);
1181         }
1182
1183         ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid);
1184         if (ret != LDB_SUCCESS) {
1185                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1186                 return ret;
1187         }
1188         /* do we have delete object on the object? */
1189
1190         status = sec_access_check_ds(sd, acl_user_token(module),
1191                                      SEC_STD_DELETE,
1192                                      &access_granted,
1193                                      NULL,
1194                                      sid);
1195
1196         if (NT_STATUS_IS_OK(status)) {
1197                 return ldb_next_request(module, req);
1198         }
1199         /* what about delete child on the current parent */
1200         ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL);
1201         if (ret != LDB_SUCCESS) {
1202                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1203                 return ldb_module_done(req, NULL, NULL, ret);
1204         }
1205         return ldb_next_request(module, req);
1206 }
1207
1208 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1209 {
1210         struct ldb_context *ldb;
1211         struct acl_context *ac;
1212         struct acl_private *data;
1213         struct ldb_result *acl_res;
1214         static const char *acl_attrs[] = {
1215                 "objectClass",
1216                 "nTSecurityDescriptor",
1217                 "objectSid",
1218                 NULL
1219         };
1220         int ret, i;
1221
1222         ac = talloc_get_type(req->context, struct acl_context);
1223         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1224         ldb = ldb_module_get_ctx(ac->module);
1225
1226         if (!ares) {
1227                 return ldb_module_done(ac->req, NULL, NULL,
1228                                        LDB_ERR_OPERATIONS_ERROR);
1229         }
1230         if (ares->error != LDB_SUCCESS) {
1231                 return ldb_module_done(ac->req, ares->controls,
1232                                        ares->response, ares->error);
1233         }
1234
1235         switch (ares->type) {
1236         case LDB_REPLY_ENTRY:
1237                 if (ac->allowedAttributes
1238                     || ac->allowedChildClasses
1239                     || ac->allowedChildClassesEffective
1240                     || ac->allowedAttributesEffective
1241                     || ac->sDRightsEffective) {
1242                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1243                                                     acl_attrs,
1244                                                     DSDB_FLAG_NEXT_MODULE);
1245                         if (ret != LDB_SUCCESS) {
1246                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1247                         }
1248                         if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1249                                 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1250                                 if (ret != LDB_SUCCESS) {
1251                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1252                                 }
1253                         }
1254                         if (ac->allowedChildClasses) {
1255                                 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1256                                                        ares->message, "allowedChildClasses");
1257                                 if (ret != LDB_SUCCESS) {
1258                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1259                                 }
1260                         }
1261                         if (ac->allowedChildClassesEffective) {
1262                                 ret = acl_childClassesEffective(ac->module, ac->schema,
1263                                                                 acl_res->msgs[0], ares->message, ac);
1264                                 if (ret != LDB_SUCCESS) {
1265                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1266                                 }
1267                         }
1268                         if (ac->sDRightsEffective) {
1269                                 ret = acl_sDRightsEffective(ac->module,
1270                                                             acl_res->msgs[0], ares->message, ac);
1271                                 if (ret != LDB_SUCCESS) {
1272                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1273                                 }
1274                         }
1275                 }
1276                 if (data && data->password_attrs) {
1277                         if (!ac->am_system) {
1278                                 for (i = 0; data->password_attrs[i]; i++) {
1279                                         ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1280                                 }
1281                         }
1282                 }
1283                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1284
1285         case LDB_REPLY_REFERRAL:
1286                 return ldb_module_send_referral(ac->req, ares->referral);
1287
1288         case LDB_REPLY_DONE:
1289                 return ldb_module_done(ac->req, ares->controls,
1290                                        ares->response, LDB_SUCCESS);
1291
1292         }
1293         return LDB_SUCCESS;
1294 }
1295
1296 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1297 {
1298         struct ldb_context *ldb;
1299         struct acl_context *ac;
1300         struct ldb_request *down_req;
1301         struct acl_private *data;
1302         int ret, i;
1303
1304         ldb = ldb_module_get_ctx(module);
1305
1306         ac = talloc_zero(req, struct acl_context);
1307         if (ac == NULL) {
1308                 return ldb_oom(ldb);
1309         }
1310         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1311
1312         ac->module = module;
1313         ac->req = req;
1314         ac->am_system = dsdb_module_am_system(module);
1315         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1316         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1317         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1318         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1319         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1320         ac->schema = dsdb_get_schema(ldb, ac);
1321
1322         /* replace any attributes in the parse tree that are private,
1323            so we don't allow a search for 'userPassword=penguin',
1324            just as we would not allow that attribute to be returned */
1325         if (ac->am_system) {
1326                 /* FIXME: We should copy the tree and keep the original unmodified. */
1327                 /* remove password attributes */
1328                 if (data && data->password_attrs) {
1329                         for (i = 0; data->password_attrs[i]; i++) {
1330                                 ldb_parse_tree_attr_replace(req->op.search.tree,
1331                                                             data->password_attrs[i],
1332                                                             "kludgeACLredactedattribute");
1333                         }
1334                 }
1335         }
1336         ret = ldb_build_search_req_ex(&down_req,
1337                                       ldb, ac,
1338                                       req->op.search.base,
1339                                       req->op.search.scope,
1340                                       req->op.search.tree,
1341                                       req->op.search.attrs,
1342                                       req->controls,
1343                                       ac, acl_search_callback,
1344                                       req);
1345         if (ret != LDB_SUCCESS) {
1346                 return ret;
1347         }
1348         /* perform the search */
1349         return ldb_next_request(module, down_req);
1350 }
1351
1352 static const char *acl_user_name(TALLOC_CTX *mem_ctx, struct ldb_module *module)
1353 {
1354         struct ldb_context *ldb = ldb_module_get_ctx(module);
1355         struct auth_session_info *session_info
1356                 = (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
1357         if (!session_info) {
1358                 return "UNKNOWN (NULL)";
1359         }
1360
1361         return talloc_asprintf(mem_ctx, "%s\\%s",
1362                                session_info->server_info->domain_name,
1363                                session_info->server_info->account_name);
1364 }
1365
1366 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1367 {
1368         struct ldb_context *ldb = ldb_module_get_ctx(module);
1369         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1370
1371         /* allow everybody to read the sequence number */
1372         if (strcmp(req->op.extended.oid,
1373                    LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1374                 return ldb_next_request(module, req);
1375         }
1376
1377         if (dsdb_module_am_system(module) ||
1378             dsdb_module_am_administrator(module) || as_system) {
1379                 return ldb_next_request(module, req);
1380         } else {
1381                 ldb_asprintf_errstring(ldb,
1382                                        "acl_extended: "
1383                                        "attempted database modify not permitted. "
1384                                        "User %s is not SYSTEM or an administrator",
1385                                        acl_user_name(req, module));
1386                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1387         }
1388 }
1389
1390 _PUBLIC_ const struct ldb_module_ops ldb_acl_module_ops = {
1391         .name              = "acl",
1392         .search            = acl_search,
1393         .add               = acl_add,
1394         .modify            = acl_modify,
1395         .del               = acl_delete,
1396         .rename            = acl_rename,
1397         .extended          = acl_extended,
1398         .init_context      = acl_module_init
1399 };