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