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 #include "system/kerberos.h"
  44 #include "auth/kerberos/kerberos.h"
  45
  46 struct extended_access_check_attribute {
  47         const char *oa_name;
  48         const uint32_t requires_rights;
  49 };
  50
  51 struct acl_private {
  52         bool acl_search;
  53         const char **password_attrs;
  54         void *cached_schema_ptr;
  55         uint64_t cached_schema_metadata_usn;
  56         uint64_t cached_schema_loaded_usn;
  57         const char **confidential_attrs;
  58 };
  59
  60 struct acl_context {
  61         struct ldb_module *module;
  62         struct ldb_request *req;
  63         bool am_system;
  64         bool am_administrator;
  65         bool modify_search;
  66         bool constructed_attrs;
  67         bool allowedAttributes;
  68         bool allowedAttributesEffective;
  69         bool allowedChildClasses;
  70         bool allowedChildClassesEffective;
  71         bool sDRightsEffective;
  72         bool userPassword;
  73         const char * const *attrs;
  74         struct dsdb_schema *schema;
  75 };
  76
  77 static int acl_module_init(struct ldb_module *module)
  78 {
  79         struct ldb_context *ldb;
  80         struct acl_private *data;
  81         int ret;
  82         unsigned int i, n, j;
  83         TALLOC_CTX *mem_ctx;
  84         static const char * const attrs[] = { "passwordAttribute", NULL };
  85         static const char * const secret_attrs[] = {
  86                 DSDB_SECRET_ATTRIBUTES
  87         };
  88         struct ldb_result *res;
  89         struct ldb_message *msg;
  90         struct ldb_message_element *password_attributes;
  91
  92         ldb = ldb_module_get_ctx(module);
  93
  94         ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
  95         if (ret != LDB_SUCCESS) {
  96                 ldb_debug(ldb, LDB_DEBUG_ERROR,
  97                           "acl_module_init: Unable to register control with rootdse!\n");
  98                 return ldb_operr(ldb);
  99         }
 100
 101         data = talloc_zero(module, struct acl_private);
 102         if (data == NULL) {
 103                 return ldb_oom(ldb);
 104         }
 105
 106         data->acl_search = lpcfg_parm_bool(ldb_get_opaque(ldb, "loadparm"),
 107                                         NULL, "acl", "search", true);
 108         ldb_module_set_private(module, data);
 109
 110         mem_ctx = talloc_new(module);
 111         if (!mem_ctx) {
 112                 return ldb_oom(ldb);
 113         }
 114
 115         ret = dsdb_module_search_dn(module, mem_ctx, &res,
 116                                     ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
 117                                     attrs,
 118                                     DSDB_FLAG_NEXT_MODULE |
 119                                     DSDB_FLAG_AS_SYSTEM,
 120                                     NULL);
 121         if (ret != LDB_SUCCESS) {
 122                 goto done;
 123         }
 124         if (res->count == 0) {
 125                 goto done;
 126         }
 127
 128         if (res->count > 1) {
 129                 talloc_free(mem_ctx);
 130                 return LDB_ERR_CONSTRAINT_VIOLATION;
 131         }
 132
 133         msg = res->msgs[0];
 134
 135         password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
 136         if (!password_attributes) {
 137                 goto done;
 138         }
 139         data->password_attrs = talloc_array(data, const char *,
 140                         password_attributes->num_values +
 141                         ARRAY_SIZE(secret_attrs) + 1);
 142         if (!data->password_attrs) {
 143                 talloc_free(mem_ctx);
 144                 return ldb_oom(ldb);
 145         }
 146
 147         n = 0;
 148         for (i=0; i < password_attributes->num_values; i++) {
 149                 data->password_attrs[n] = (const char *)password_attributes->values[i].data;
 150                 talloc_steal(data->password_attrs, password_attributes->values[i].data);
 151                 n++;
 152         }
 153
 154         for (i=0; i < ARRAY_SIZE(secret_attrs); i++) {
 155                 bool found = false;
 156
 157                 for (j=0; j < n; j++) {
 158                         if (strcasecmp(data->password_attrs[j], secret_attrs[i]) == 0) {
 159                                 found = true;
 160                                 break;
 161                         }
 162                 }
 163
 164                 if (found) {
 165                         continue;
 166                 }
 167
 168                 data->password_attrs[n] = talloc_strdup(data->password_attrs,
 169                                                         secret_attrs[i]);
 170                 if (data->password_attrs[n] == NULL) {
 171                         talloc_free(mem_ctx);
 172                         return ldb_oom(ldb);
 173                 }
 174                 n++;
 175         }
 176         data->password_attrs[n] = NULL;
 177
 178 done:
 179         talloc_free(mem_ctx);
 180         return ldb_next_init(module);
 181 }
 182
 183 static int acl_allowedAttributes(struct ldb_module *module,
 184                                  const struct dsdb_schema *schema,
 185                                  struct ldb_message *sd_msg,
 186                                  struct ldb_message *msg,
 187                                  struct acl_context *ac)
 188 {
 189         struct ldb_message_element *oc_el;
 190         struct ldb_context *ldb = ldb_module_get_ctx(module);
 191         TALLOC_CTX *mem_ctx;
 192         const char **attr_list;
 193         int i, ret;
 194         const struct dsdb_class *objectclass;
 195
 196         /* If we don't have a schema yet, we can't do anything... */
 197         if (schema == NULL) {
 198                 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 199                 return LDB_ERR_OPERATIONS_ERROR;
 200         }
 201
 202         /* Must remove any existing attribute */
 203         if (ac->allowedAttributes) {
 204                 ldb_msg_remove_attr(msg, "allowedAttributes");
 205         }
 206
 207         mem_ctx = talloc_new(msg);
 208         if (!mem_ctx) {
 209                 return ldb_oom(ldb);
 210         }
 211
 212         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 213         attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
 214         if (!attr_list) {
 215                 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
 216                 talloc_free(mem_ctx);
 217                 return LDB_ERR_OPERATIONS_ERROR;
 218         }
 219
 220         /*
 221          * Get the top-most structural object class for the ACL check
 222          */
 223         objectclass = dsdb_get_last_structural_class(ac->schema,
 224                                                      oc_el);
 225         if (objectclass == NULL) {
 226                 ldb_asprintf_errstring(ldb, "acl_read: Failed to find a structural class for %s",
 227                                        ldb_dn_get_linearized(sd_msg->dn));
 228                 talloc_free(mem_ctx);
 229                 return LDB_ERR_OPERATIONS_ERROR;
 230         }
 231
 232         if (ac->allowedAttributes) {
 233                 for (i=0; attr_list && attr_list[i]; i++) {
 234                         ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
 235                 }
 236         }
 237         if (ac->allowedAttributesEffective) {
 238                 struct security_descriptor *sd;
 239                 struct dom_sid *sid = NULL;
 240                 struct ldb_control *as_system = ldb_request_get_control(ac->req,
 241                                                                         LDB_CONTROL_AS_SYSTEM_OID);
 242
 243                 if (as_system != NULL) {
 244                         as_system->critical = 0;
 245                 }
 246
 247                 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
 248                 if (ac->am_system || as_system) {
 249                         for (i=0; attr_list && attr_list[i]; i++) {
 250                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 251                         }
 252                         return LDB_SUCCESS;
 253                 }
 254
 255                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), mem_ctx, sd_msg, &sd);
 256
 257                 if (ret != LDB_SUCCESS) {
 258                         return ret;
 259                 }
 260
 261                 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
 262                 for (i=0; attr_list && attr_list[i]; i++) {
 263                         const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
 264                                                                                         attr_list[i]);
 265                         if (!attr) {
 266                                 return ldb_operr(ldb);
 267                         }
 268                         /* remove constructed attributes */
 269                         if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
 270                             || attr->systemOnly
 271                             || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
 272                                 continue;
 273                         }
 274                         ret = acl_check_access_on_attribute(module,
 275                                                             msg,
 276                                                             sd,
 277                                                             sid,
 278                                                             SEC_ADS_WRITE_PROP,
 279                                                             attr,
 280                                                             objectclass);
 281                         if (ret == LDB_SUCCESS) {
 282                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 283                         }
 284                 }
 285         }
 286         return LDB_SUCCESS;
 287 }
 288
 289 static int acl_childClasses(struct ldb_module *module,
 290                             const struct dsdb_schema *schema,
 291                             struct ldb_message *sd_msg,
 292                             struct ldb_message *msg,
 293                             const char *attrName)
 294 {
 295         struct ldb_message_element *oc_el;
 296         struct ldb_message_element *allowedClasses;
 297         const struct dsdb_class *sclass;
 298         unsigned int i, j;
 299         int ret;
 300
 301         /* If we don't have a schema yet, we can't do anything... */
 302         if (schema == NULL) {
 303                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 304                 return LDB_ERR_OPERATIONS_ERROR;
 305         }
 306
 307         /* Must remove any existing attribute, or else confusion reins */
 308         ldb_msg_remove_attr(msg, attrName);
 309         ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
 310         if (ret != LDB_SUCCESS) {
 311                 return ret;
 312         }
 313
 314         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 315
 316         for (i=0; oc_el && i < oc_el->num_values; i++) {
 317                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 318                 if (!sclass) {
 319                         /* We don't know this class?  what is going on? */
 320                         continue;
 321                 }
 322
 323                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 324                         ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
 325                 }
 326         }
 327         if (allowedClasses->num_values > 1) {
 328                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 329                 for (i=1 ; i < allowedClasses->num_values; i++) {
 330                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 331                         struct ldb_val *val2 = &allowedClasses->values[i];
 332                         if (data_blob_cmp(val1, val2) == 0) {
 333                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
 334                                 allowedClasses->num_values--;
 335                                 i--;
 336                         }
 337                 }
 338         }
 339
 340         return LDB_SUCCESS;
 341 }
 342
 343 static int acl_childClassesEffective(struct ldb_module *module,
 344                                      const struct dsdb_schema *schema,
 345                                      struct ldb_message *sd_msg,
 346                                      struct ldb_message *msg,
 347                                      struct acl_context *ac)
 348 {
 349         struct ldb_message_element *oc_el;
 350         struct ldb_message_element *allowedClasses = NULL;
 351         const struct dsdb_class *sclass;
 352         struct security_descriptor *sd;
 353         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 354                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 355         struct dom_sid *sid = NULL;
 356         unsigned int i, j;
 357         int ret;
 358
 359         if (as_system != NULL) {
 360                 as_system->critical = 0;
 361         }
 362
 363         if (ac->am_system || as_system) {
 364                 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
 365         }
 366
 367         /* If we don't have a schema yet, we can't do anything... */
 368         if (schema == NULL) {
 369                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 370                 return LDB_ERR_OPERATIONS_ERROR;
 371         }
 372
 373         /* Must remove any existing attribute, or else confusion reins */
 374         ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
 375
 376         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 377         ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 378         if (ret != LDB_SUCCESS) {
 379                 return ret;
 380         }
 381
 382         sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 383         for (i=0; oc_el && i < oc_el->num_values; i++) {
 384                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 385                 if (!sclass) {
 386                         /* We don't know this class?  what is going on? */
 387                         continue;
 388                 }
 389
 390                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 391                         const struct dsdb_class *sc;
 392
 393                         sc = dsdb_class_by_lDAPDisplayName(schema,
 394                                                            sclass->possibleInferiors[j]);
 395                         if (!sc) {
 396                                 /* We don't know this class?  what is going on? */
 397                                 continue;
 398                         }
 399
 400                         ret = acl_check_access_on_objectclass(module, ac,
 401                                                               sd, sid,
 402                                                               SEC_ADS_CREATE_CHILD,
 403                                                               sc);
 404                         if (ret == LDB_SUCCESS) {
 405                                 ldb_msg_add_string(msg, "allowedChildClassesEffective",
 406                                                    sclass->possibleInferiors[j]);
 407                         }
 408                 }
 409         }
 410         allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
 411         if (!allowedClasses) {
 412                 return LDB_SUCCESS;
 413         }
 414
 415         if (allowedClasses->num_values > 1) {
 416                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 417                 for (i=1 ; i < allowedClasses->num_values; i++) {
 418                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 419                         struct ldb_val *val2 = &allowedClasses->values[i];
 420                         if (data_blob_cmp(val1, val2) == 0) {
 421                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
 422                                 allowedClasses->num_values--;
 423                                 i--;
 424                         }
 425                 }
 426         }
 427         return LDB_SUCCESS;
 428 }
 429
 430 static int acl_sDRightsEffective(struct ldb_module *module,
 431                                  struct ldb_message *sd_msg,
 432                                  struct ldb_message *msg,
 433                                  struct acl_context *ac)
 434 {
 435         struct ldb_context *ldb = ldb_module_get_ctx(module);
 436         struct ldb_message_element *rightsEffective;
 437         int ret;
 438         struct security_descriptor *sd;
 439         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 440                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 441         struct dom_sid *sid = NULL;
 442         uint32_t flags = 0;
 443
 444         if (as_system != NULL) {
 445                 as_system->critical = 0;
 446         }
 447
 448         /* Must remove any existing attribute, or else confusion reins */
 449         ldb_msg_remove_attr(msg, "sDRightsEffective");
 450         ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
 451         if (ret != LDB_SUCCESS) {
 452                 return ret;
 453         }
 454         if (ac->am_system || as_system) {
 455                 flags = SECINFO_OWNER | SECINFO_GROUP |  SECINFO_SACL |  SECINFO_DACL;
 456         } else {
 457                 const struct dsdb_class *objectclass;
 458                 const struct dsdb_attribute *attr;
 459
 460                 objectclass = dsdb_get_structural_oc_from_msg(ac->schema, sd_msg);
 461                 if (objectclass == NULL) {
 462                         return ldb_operr(ldb);
 463                 }
 464
 465                 attr = dsdb_attribute_by_lDAPDisplayName(ac->schema,
 466                                                          "nTSecurityDescriptor");
 467                 if (attr == NULL) {
 468                         return ldb_operr(ldb);
 469                 }
 470
 471                 /* Get the security descriptor from the message */
 472                 ret = dsdb_get_sd_from_ldb_message(ldb, msg, sd_msg, &sd);
 473                 if (ret != LDB_SUCCESS) {
 474                         return ret;
 475                 }
 476                 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 477                 ret = acl_check_access_on_attribute(module,
 478                                                     msg,
 479                                                     sd,
 480                                                     sid,
 481                                                     SEC_STD_WRITE_OWNER,
 482                                                     attr,
 483                                                     objectclass);
 484                 if (ret == LDB_SUCCESS) {
 485                         flags |= SECINFO_OWNER | SECINFO_GROUP;
 486                 }
 487                 ret = acl_check_access_on_attribute(module,
 488                                                     msg,
 489                                                     sd,
 490                                                     sid,
 491                                                     SEC_STD_WRITE_DAC,
 492                                                     attr,
 493                                                     objectclass);
 494                 if (ret == LDB_SUCCESS) {
 495                         flags |= SECINFO_DACL;
 496                 }
 497                 ret = acl_check_access_on_attribute(module,
 498                                                     msg,
 499                                                     sd,
 500                                                     sid,
 501                                                     SEC_FLAG_SYSTEM_SECURITY,
 502                                                     attr,
 503                                                     objectclass);
 504                 if (ret == LDB_SUCCESS) {
 505                         flags |= SECINFO_SACL;
 506                 }
 507         }
 508         return samdb_msg_add_uint(ldb_module_get_ctx(module), msg, msg,
 509                                   "sDRightsEffective", flags);
 510 }
 511
 512 static int acl_validate_spn_value(TALLOC_CTX *mem_ctx,
 513                                   struct ldb_context *ldb,
 514                                   const char *spn_value,
 515                                   uint32_t userAccountControl,
 516                                   const char *samAccountName,
 517                                   const char *dnsHostName,
 518                                   const char *netbios_name,
 519                                   const char *ntds_guid)
 520 {
 521         int ret;
 522         krb5_context krb_ctx;
 523         krb5_error_code kerr;
 524         krb5_principal principal;
 525         char *instanceName;
 526         char *serviceType;
 527         char *serviceName;
 528         const char *forest_name = samdb_forest_name(ldb, mem_ctx);
 529         const char *base_domain = samdb_default_domain_name(ldb, mem_ctx);
 530         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
 531                                                           struct loadparm_context);
 532         bool is_dc = (userAccountControl & UF_SERVER_TRUST_ACCOUNT) ||
 533                 (userAccountControl & UF_PARTIAL_SECRETS_ACCOUNT);
 534
 535         if (strcasecmp_m(spn_value, samAccountName) == 0) {
 536                 /* MacOS X sets this value, and setting an SPN of your
 537                  * own samAccountName is both pointless and safe */
 538                 return LDB_SUCCESS;
 539         }
 540
 541         kerr = smb_krb5_init_context_basic(mem_ctx,
 542                                            lp_ctx,
 543                                            &krb_ctx);
 544         if (kerr != 0) {
 545                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 546                                  "Could not initialize kerberos context.");
 547         }
 548
 549         ret = krb5_parse_name(krb_ctx, spn_value, &principal);
 550         if (ret) {
 551                 krb5_free_context(krb_ctx);
 552                 return LDB_ERR_CONSTRAINT_VIOLATION;
 553         }
 554
 555         if (krb5_princ_size(krb_ctx, principal) < 2) {
 556                 goto fail;
 557         }
 558
 559         instanceName = smb_krb5_principal_get_comp_string(mem_ctx, krb_ctx,
 560                                                           principal, 1);
 561         serviceType = smb_krb5_principal_get_comp_string(mem_ctx, krb_ctx,
 562                                                          principal, 0);
 563         if (krb5_princ_size(krb_ctx, principal) == 3) {
 564                 serviceName = smb_krb5_principal_get_comp_string(mem_ctx, krb_ctx,
 565                                                                  principal, 2);
 566         } else {
 567                 serviceName = NULL;
 568         }
 569
 570         if (serviceName) {
 571                 if (!is_dc) {
 572                         goto fail;
 573                 }
 574                 if (strcasecmp(serviceType, "ldap") == 0) {
 575                         if (strcasecmp(serviceName, netbios_name) != 0 &&
 576                             strcasecmp(serviceName, forest_name) != 0) {
 577                                 goto fail;
 578                         }
 579
 580                 } else if (strcasecmp(serviceType, "gc") == 0) {
 581                         if (strcasecmp(serviceName, forest_name) != 0) {
 582                                 goto fail;
 583                         }
 584                 } else {
 585                         if (strcasecmp(serviceName, base_domain) != 0 &&
 586                             strcasecmp(serviceName, netbios_name) != 0) {
 587                                 goto fail;
 588                         }
 589                 }
 590         }
 591         /* instanceName can be samAccountName without $ or dnsHostName
 592          * or "ntds_guid._msdcs.forest_domain for DC objects */
 593         if (strlen(instanceName) == (strlen(samAccountName) - 1)
 594             && strncasecmp(instanceName, samAccountName, strlen(samAccountName) - 1) == 0) {
 595                 goto success;
 596         } else if (dnsHostName != NULL && strcasecmp(instanceName, dnsHostName) == 0) {
 597                 goto success;
 598         } else if (is_dc) {
 599                 const char *guid_str;
 600                 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
 601                                            ntds_guid,
 602                                            forest_name);
 603                 if (strcasecmp(instanceName, guid_str) == 0) {
 604                         goto success;
 605                 }
 606         }
 607
 608 fail:
 609         krb5_free_principal(krb_ctx, principal);
 610         krb5_free_context(krb_ctx);
 611         return LDB_ERR_CONSTRAINT_VIOLATION;
 612
 613 success:
 614         krb5_free_principal(krb_ctx, principal);
 615         krb5_free_context(krb_ctx);
 616         return LDB_SUCCESS;
 617 }
 618
 619 static int acl_check_spn(TALLOC_CTX *mem_ctx,
 620                          struct ldb_module *module,
 621                          struct ldb_request *req,
 622                          struct security_descriptor *sd,
 623                          struct dom_sid *sid,
 624                          const struct dsdb_attribute *attr,
 625                          const struct dsdb_class *objectclass)
 626 {
 627         int ret;
 628         unsigned int i;
 629         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 630         struct ldb_context *ldb = ldb_module_get_ctx(module);
 631         struct ldb_result *acl_res;
 632         struct ldb_result *netbios_res;
 633         struct ldb_message_element *el;
 634         struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
 635         uint32_t userAccountControl;
 636         const char *samAccountName;
 637         const char *dnsHostName;
 638         const char *netbios_name;
 639         struct GUID ntds;
 640         char *ntds_guid = NULL;
 641
 642         static const char *acl_attrs[] = {
 643                 "samAccountName",
 644                 "dnsHostName",
 645                 "userAccountControl",
 646                 NULL
 647         };
 648         static const char *netbios_attrs[] = {
 649                 "nETBIOSName",
 650                 NULL
 651         };
 652
 653         /* if we have wp, we can do whatever we like */
 654         if (acl_check_access_on_attribute(module,
 655                                           tmp_ctx,
 656                                           sd,
 657                                           sid,
 658                                           SEC_ADS_WRITE_PROP,
 659                                           attr, objectclass) == LDB_SUCCESS) {
 660                 talloc_free(tmp_ctx);
 661                 return LDB_SUCCESS;
 662         }
 663
 664         ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 665                                        GUID_DRS_VALIDATE_SPN,
 666                                        SEC_ADS_SELF_WRITE,
 667                                        sid);
 668
 669         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 670                 dsdb_acl_debug(sd, acl_user_token(module),
 671                                req->op.mod.message->dn,
 672                                true,
 673                                10);
 674                 talloc_free(tmp_ctx);
 675                 return ret;
 676         }
 677
 678         ret = dsdb_module_search_dn(module, tmp_ctx,
 679                                     &acl_res, req->op.mod.message->dn,
 680                                     acl_attrs,
 681                                     DSDB_FLAG_NEXT_MODULE |
 682                                     DSDB_FLAG_AS_SYSTEM |
 683                                     DSDB_SEARCH_SHOW_RECYCLED,
 684                                     req);
 685         if (ret != LDB_SUCCESS) {
 686                 talloc_free(tmp_ctx);
 687                 return ret;
 688         }
 689
 690         userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
 691         dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
 692         samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
 693
 694         ret = dsdb_module_search(module, tmp_ctx,
 695                                  &netbios_res, partitions_dn,
 696                                  LDB_SCOPE_ONELEVEL,
 697                                  netbios_attrs,
 698                                  DSDB_FLAG_NEXT_MODULE |
 699                                  DSDB_FLAG_AS_SYSTEM,
 700                                  req,
 701                                  "(ncName=%s)",
 702                                  ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
 703
 704         netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
 705
 706         el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
 707         if (!el) {
 708                 talloc_free(tmp_ctx);
 709                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 710                                          "Error finding element for servicePrincipalName.");
 711         }
 712
 713         /* NTDSDSA objectGuid of object we are checking SPN for */
 714         if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
 715                 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
 716                                                              req->op.mod.message->dn, &ntds, req);
 717                 if (ret != LDB_SUCCESS) {
 718                         ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
 719                                                ldb_dn_get_linearized(req->op.mod.message->dn),
 720                                                ldb_strerror(ret));
 721                         talloc_free(tmp_ctx);
 722                         return LDB_ERR_OPERATIONS_ERROR;
 723                 }
 724                 ntds_guid = GUID_string(tmp_ctx, &ntds);
 725         }
 726
 727         for (i=0; i < el->num_values; i++) {
 728                 ret = acl_validate_spn_value(tmp_ctx,
 729                                              ldb,
 730                                              (char *)el->values[i].data,
 731                                              userAccountControl,
 732                                              samAccountName,
 733                                              dnsHostName,
 734                                              netbios_name,
 735                                              ntds_guid);
 736                 if (ret != LDB_SUCCESS) {
 737                         talloc_free(tmp_ctx);
 738                         return ret;
 739                 }
 740         }
 741         talloc_free(tmp_ctx);
 742         return LDB_SUCCESS;
 743 }
 744
 745 static int acl_add(struct ldb_module *module, struct ldb_request *req)
 746 {
 747         int ret;
 748         struct ldb_dn *parent;
 749         struct ldb_context *ldb;
 750         const struct dsdb_schema *schema;
 751         const struct dsdb_class *objectclass;
 752         struct ldb_control *as_system;
 753         struct ldb_message_element *el;
 754         unsigned int instanceType = 0;
 755
 756         if (ldb_dn_is_special(req->op.add.message->dn)) {
 757                 return ldb_next_request(module, req);
 758         }
 759
 760         as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 761         if (as_system != NULL) {
 762                 as_system->critical = 0;
 763         }
 764
 765         if (dsdb_module_am_system(module) || as_system) {
 766                 return ldb_next_request(module, req);
 767         }
 768
 769         ldb = ldb_module_get_ctx(module);
 770
 771         parent = ldb_dn_get_parent(req, req->op.add.message->dn);
 772         if (parent == NULL) {
 773                 return ldb_oom(ldb);
 774         }
 775
 776         schema = dsdb_get_schema(ldb, req);
 777         if (!schema) {
 778                 return ldb_operr(ldb);
 779         }
 780
 781         objectclass = dsdb_get_structural_oc_from_msg(schema, req->op.add.message);
 782         if (!objectclass) {
 783                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
 784                                        "acl: unable to find or validate structural objectClass on %s\n",
 785                                        ldb_dn_get_linearized(req->op.add.message->dn));
 786                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 787         }
 788
 789         el = ldb_msg_find_element(req->op.add.message, "instanceType");
 790         if ((el != NULL) && (el->num_values != 1)) {
 791                 ldb_set_errstring(ldb, "acl: the 'instanceType' attribute is single-valued!");
 792                 return LDB_ERR_UNWILLING_TO_PERFORM;
 793         }
 794
 795         instanceType = ldb_msg_find_attr_as_uint(req->op.add.message,
 796                                                  "instanceType", 0);
 797         if (instanceType & INSTANCE_TYPE_IS_NC_HEAD) {
 798                 static const char *no_attrs[] = { NULL };
 799                 struct ldb_result *partition_res;
 800                 struct ldb_dn *partitions_dn;
 801
 802                 partitions_dn = samdb_partitions_dn(ldb, req);
 803                 if (!partitions_dn) {
 804                         ldb_set_errstring(ldb, "acl: CN=partitions dn could not be generated!");
 805                         return LDB_ERR_UNWILLING_TO_PERFORM;
 806                 }
 807
 808                 ret = dsdb_module_search(module, req, &partition_res,
 809                                          partitions_dn, LDB_SCOPE_ONELEVEL,
 810                                          no_attrs,
 811                                          DSDB_FLAG_NEXT_MODULE |
 812                                          DSDB_FLAG_AS_SYSTEM |
 813                                          DSDB_SEARCH_ONE_ONLY |
 814                                          DSDB_SEARCH_SHOW_RECYCLED,
 815                                          req,
 816                                          "(&(nCName=%s)(objectClass=crossRef))",
 817                                          ldb_dn_get_linearized(req->op.add.message->dn));
 818
 819                 if (ret == LDB_SUCCESS) {
 820                         /* Check that we can write to the crossRef object MS-ADTS 3.1.1.5.2.8.2 */
 821                         ret = dsdb_module_check_access_on_dn(module, req, partition_res->msgs[0]->dn,
 822                                                              SEC_ADS_WRITE_PROP,
 823                                                              &objectclass->schemaIDGUID, req);
 824                         if (ret != LDB_SUCCESS) {
 825                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
 826                                                        "acl: ACL check failed on crossRef object %s: %s\n",
 827                                                        ldb_dn_get_linearized(partition_res->msgs[0]->dn),
 828                                                        ldb_errstring(ldb));
 829                                 return ret;
 830                         }
 831
 832                         /*
 833                          * TODO: Remaining checks, like if we are
 834                          * the naming master etc need to be handled
 835                          * in the instanceType module
 836                          */
 837                         return ldb_next_request(module, req);
 838                 }
 839
 840                 /* Check that we can create a crossRef object MS-ADTS 3.1.1.5.2.8.2 */
 841                 ret = dsdb_module_check_access_on_dn(module, req, partitions_dn,
 842                                                      SEC_ADS_CREATE_CHILD,
 843                                                      &objectclass->schemaIDGUID, req);
 844                 if (ret == LDB_ERR_NO_SUCH_OBJECT &&
 845                     ldb_request_get_control(req, LDB_CONTROL_RELAX_OID))
 846                 {
 847                         /* Allow provision bootstrap */
 848                         ret = LDB_SUCCESS;
 849                 }
 850                 if (ret != LDB_SUCCESS) {
 851                         ldb_asprintf_errstring(ldb_module_get_ctx(module),
 852                                                "acl: ACL check failed on CN=Partitions crossRef container %s: %s\n",
 853                                                ldb_dn_get_linearized(partitions_dn), ldb_errstring(ldb));
 854                         return ret;
 855                 }
 856
 857                 /*
 858                  * TODO: Remaining checks, like if we are the naming
 859                  * master and adding the crossRef object need to be
 860                  * handled in the instanceType module
 861                  */
 862                 return ldb_next_request(module, req);
 863         }
 864
 865         ret = dsdb_module_check_access_on_dn(module, req, parent,
 866                                              SEC_ADS_CREATE_CHILD,
 867                                              &objectclass->schemaIDGUID, req);
 868         if (ret != LDB_SUCCESS) {
 869                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
 870                                        "acl: unable to get access to %s\n",
 871                                        ldb_dn_get_linearized(req->op.add.message->dn));
 872                 return ret;
 873         }
 874         return ldb_next_request(module, req);
 875 }
 876
 877 /* ckecks if modifications are allowed on "Member" attribute */
 878 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
 879                                      struct ldb_module *module,
 880                                      struct ldb_request *req,
 881                                      struct security_descriptor *sd,
 882                                      struct dom_sid *sid,
 883                                      const struct dsdb_attribute *attr,
 884                                      const struct dsdb_class *objectclass)
 885 {
 886         int ret;
 887         unsigned int i;
 888         struct ldb_context *ldb = ldb_module_get_ctx(module);
 889         struct ldb_dn *user_dn;
 890         struct ldb_message_element *member_el;
 891         /* if we have wp, we can do whatever we like */
 892         if (acl_check_access_on_attribute(module,
 893                                           mem_ctx,
 894                                           sd,
 895                                           sid,
 896                                           SEC_ADS_WRITE_PROP,
 897                                           attr, objectclass) == LDB_SUCCESS) {
 898                 return LDB_SUCCESS;
 899         }
 900         /* if we are adding/deleting ourselves, check for self membership */
 901         ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
 902                                   &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
 903                                   &user_dn);
 904         if (ret != LDB_SUCCESS) {
 905                 return ret;
 906         }
 907         member_el = ldb_msg_find_element(req->op.mod.message, "member");
 908         if (!member_el) {
 909                 return ldb_operr(ldb);
 910         }
 911         /* user can only remove oneself */
 912         if (member_el->num_values == 0) {
 913                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 914         }
 915         for (i = 0; i < member_el->num_values; i++) {
 916                 if (strcasecmp((const char *)member_el->values[i].data,
 917                                ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
 918                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 919                 }
 920         }
 921         ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
 922                                        GUID_DRS_SELF_MEMBERSHIP,
 923                                        SEC_ADS_SELF_WRITE,
 924                                        sid);
 925         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 926                 dsdb_acl_debug(sd, acl_user_token(module),
 927                                req->op.mod.message->dn,
 928                                true,
 929                                10);
 930         }
 931         return ret;
 932 }
 933
 934 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
 935                                      struct ldb_module *module,
 936                                      struct ldb_request *req,
 937                                      struct security_descriptor *sd,
 938                                      struct dom_sid *sid,
 939                                      const struct dsdb_class *objectclass,
 940                                      bool userPassword)
 941 {
 942         int ret = LDB_SUCCESS;
 943         unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
 944         struct ldb_message_element *el;
 945         struct ldb_message *msg;
 946         const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
 947                                         "unicodePwd", "dBCSPwd", NULL }, **l;
 948         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 949
 950         msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
 951         if (msg == NULL) {
 952                 return ldb_module_oom(module);
 953         }
 954         for (l = passwordAttrs; *l != NULL; l++) {
 955                 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
 956                         continue;
 957                 }
 958
 959                 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
 960                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
 961                                 ++del_attr_cnt;
 962                         }
 963                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
 964                                 ++add_attr_cnt;
 965                         }
 966                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
 967                                 ++rep_attr_cnt;
 968                         }
 969                         ldb_msg_remove_element(msg, el);
 970                 }
 971         }
 972
 973         /* single deletes will be handled by the "password_hash" LDB module
 974          * later in the stack, so we let it though here */
 975         if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
 976                 talloc_free(tmp_ctx);
 977                 return LDB_SUCCESS;
 978         }
 979
 980         if (ldb_request_get_control(req,
 981                                     DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
 982                 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
 983                  * have a user password change and not a set as the message
 984                  * looks like. In it's value blob it contains the NT and/or LM
 985                  * hash of the old password specified by the user.
 986                  * This control is used by the SAMR and "kpasswd" password
 987                  * change mechanisms. */
 988                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 989                                                GUID_DRS_USER_CHANGE_PASSWORD,
 990                                                SEC_ADS_CONTROL_ACCESS,
 991                                                sid);
 992         }
 993         else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
 994                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 995                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
 996                                                SEC_ADS_CONTROL_ACCESS,
 997                                                sid);
 998         }
 999         else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
1000                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
1001                                                GUID_DRS_USER_CHANGE_PASSWORD,
1002                                                SEC_ADS_CONTROL_ACCESS,
1003                                                sid);
1004                 /* Very strange, but we get constraint violation in this case */
1005                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
1006                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
1007                 }
1008         }
1009         if (ret != LDB_SUCCESS) {
1010                 dsdb_acl_debug(sd, acl_user_token(module),
1011                                req->op.mod.message->dn,
1012                                true,
1013                                10);
1014         }
1015         talloc_free(tmp_ctx);
1016         return ret;
1017 }
1018
1019
1020 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
1021 {
1022         int ret;
1023         struct ldb_context *ldb = ldb_module_get_ctx(module);
1024         const struct dsdb_schema *schema;
1025         unsigned int i;
1026         const struct dsdb_class *objectclass;
1027         struct ldb_result *acl_res;
1028         struct security_descriptor *sd;
1029         struct dom_sid *sid = NULL;
1030         struct ldb_control *as_system;
1031         struct ldb_control *is_undelete;
1032         bool userPassword;
1033         TALLOC_CTX *tmp_ctx;
1034         const struct ldb_message *msg = req->op.mod.message;
1035         static const char *acl_attrs[] = {
1036                 "nTSecurityDescriptor",
1037                 "objectClass",
1038                 "objectSid",
1039                 NULL
1040         };
1041
1042         if (ldb_dn_is_special(msg->dn)) {
1043                 return ldb_next_request(module, req);
1044         }
1045
1046         as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1047         if (as_system != NULL) {
1048                 as_system->critical = 0;
1049         }
1050
1051         is_undelete = ldb_request_get_control(req, DSDB_CONTROL_RESTORE_TOMBSTONE_OID);
1052
1053         /* Don't print this debug statement if elements[0].name is going to be NULL */
1054         if (msg->num_elements > 0) {
1055                 DEBUG(10, ("ldb:acl_modify: %s\n", msg->elements[0].name));
1056         }
1057         if (dsdb_module_am_system(module) || as_system) {
1058                 return ldb_next_request(module, req);
1059         }
1060
1061         tmp_ctx = talloc_new(req);
1062         if (tmp_ctx == NULL) {
1063                 return ldb_oom(ldb);
1064         }
1065
1066         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, msg->dn,
1067                                     acl_attrs,
1068                                     DSDB_FLAG_NEXT_MODULE |
1069                                     DSDB_FLAG_AS_SYSTEM |
1070                                     DSDB_SEARCH_SHOW_RECYCLED,
1071                                     req);
1072
1073         if (ret != LDB_SUCCESS) {
1074                 goto fail;
1075         }
1076
1077         userPassword = dsdb_user_password_support(module, req, req);
1078
1079         schema = dsdb_get_schema(ldb, tmp_ctx);
1080         if (!schema) {
1081                 talloc_free(tmp_ctx);
1082                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1083                                  "acl_modify: Error obtaining schema.");
1084         }
1085
1086         ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
1087         if (ret != LDB_SUCCESS) {
1088                 talloc_free(tmp_ctx);
1089                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1090                                  "acl_modify: Error retrieving security descriptor.");
1091         }
1092         /* Theoretically we pass the check if the object has no sd */
1093         if (!sd) {
1094                 goto success;
1095         }
1096
1097         objectclass = dsdb_get_structural_oc_from_msg(schema, acl_res->msgs[0]);
1098         if (!objectclass) {
1099                 talloc_free(tmp_ctx);
1100                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1101                                  "acl_modify: Error retrieving object class for GUID.");
1102         }
1103         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1104         for (i=0; i < msg->num_elements; i++) {
1105                 const struct ldb_message_element *el = &msg->elements[i];
1106                 const struct dsdb_attribute *attr;
1107
1108                 /*
1109                  * This basic attribute existence check with the right errorcode
1110                  * is needed since this module is the first one which requests
1111                  * schema attribute information.
1112                  * The complete attribute checking is done in the
1113                  * "objectclass_attrs" module behind this one.
1114                  *
1115                  * NOTE: "clearTextPassword" is not defined in the schema.
1116                  */
1117                 attr = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1118                 if (!attr && ldb_attr_cmp("clearTextPassword", el->name) != 0) {
1119                         ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' "
1120                                                "on entry '%s' was not found in the schema!",
1121                                                req->op.mod.message->elements[i].name,
1122                                        ldb_dn_get_linearized(req->op.mod.message->dn));
1123                         ret =  LDB_ERR_NO_SUCH_ATTRIBUTE;
1124                         goto fail;
1125                 }
1126
1127                 if (ldb_attr_cmp("nTSecurityDescriptor", el->name) == 0) {
1128                         uint32_t sd_flags = dsdb_request_sd_flags(req, NULL);
1129                         uint32_t access_mask = 0;
1130
1131                         if (sd_flags & (SECINFO_OWNER|SECINFO_GROUP)) {
1132                                 access_mask |= SEC_STD_WRITE_OWNER;
1133                         }
1134                         if (sd_flags & SECINFO_DACL) {
1135                                 access_mask |= SEC_STD_WRITE_DAC;
1136                         }
1137                         if (sd_flags & SECINFO_SACL) {
1138                                 access_mask |= SEC_FLAG_SYSTEM_SECURITY;
1139                         }
1140
1141                         ret = acl_check_access_on_attribute(module,
1142                                                             tmp_ctx,
1143                                                             sd,
1144                                                             sid,
1145                                                             access_mask,
1146                                                             attr,
1147                                                             objectclass);
1148                         if (ret != LDB_SUCCESS) {
1149                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1150                                                        "Object %s has no write dacl access\n",
1151                                                        ldb_dn_get_linearized(msg->dn));
1152                                 dsdb_acl_debug(sd,
1153                                                acl_user_token(module),
1154                                                msg->dn,
1155                                                true,
1156                                                10);
1157                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1158                                 goto fail;
1159                         }
1160                 } else if (ldb_attr_cmp("member", el->name) == 0) {
1161                         ret = acl_check_self_membership(tmp_ctx,
1162                                                         module,
1163                                                         req,
1164                                                         sd,
1165                                                         sid,
1166                                                         attr,
1167                                                         objectclass);
1168                         if (ret != LDB_SUCCESS) {
1169                                 goto fail;
1170                         }
1171                 } else if (ldb_attr_cmp("dBCSPwd", el->name) == 0) {
1172                         /* this one is not affected by any rights, we should let it through
1173                            so that passwords_hash returns the correct error */
1174                         continue;
1175                 } else if (ldb_attr_cmp("unicodePwd", el->name) == 0 ||
1176                            (userPassword && ldb_attr_cmp("userPassword", el->name) == 0) ||
1177                            ldb_attr_cmp("clearTextPassword", el->name) == 0) {
1178                         ret = acl_check_password_rights(tmp_ctx,
1179                                                         module,
1180                                                         req,
1181                                                         sd,
1182                                                         sid,
1183                                                         objectclass,
1184                                                         userPassword);
1185                         if (ret != LDB_SUCCESS) {
1186                                 goto fail;
1187                         }
1188                 } else if (ldb_attr_cmp("servicePrincipalName", el->name) == 0) {
1189                         ret = acl_check_spn(tmp_ctx,
1190                                             module,
1191                                             req,
1192                                             sd,
1193                                             sid,
1194                                             attr,
1195                                             objectclass);
1196                         if (ret != LDB_SUCCESS) {
1197                                 goto fail;
1198                         }
1199                 } else if (is_undelete != NULL && (ldb_attr_cmp("isDeleted", el->name) == 0)) {
1200                         /*
1201                          * in case of undelete op permissions on
1202                          * isDeleted are irrelevant and
1203                          * distinguishedName is removed by the
1204                          * tombstone_reanimate module
1205                          */
1206                         continue;
1207                 } else {
1208                         ret = acl_check_access_on_attribute(module,
1209                                                             tmp_ctx,
1210                                                             sd,
1211                                                             sid,
1212                                                             SEC_ADS_WRITE_PROP,
1213                                                             attr,
1214                                                             objectclass);
1215                         if (ret != LDB_SUCCESS) {
1216                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1217                                                        "Object %s has no write property access\n",
1218                                                        ldb_dn_get_linearized(msg->dn));
1219                                 dsdb_acl_debug(sd,
1220                                                acl_user_token(module),
1221                                                msg->dn,
1222                                                true,
1223                                                10);
1224                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1225                                 goto fail;
1226                         }
1227                 }
1228         }
1229
1230 success:
1231         talloc_free(tmp_ctx);
1232         return ldb_next_request(module, req);
1233 fail:
1234         talloc_free(tmp_ctx);
1235         return ret;
1236 }
1237
1238 /* similar to the modify for the time being.
1239  * We need to consider the special delete tree case, though - TODO */
1240 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1241 {
1242         int ret;
1243         struct ldb_dn *parent;
1244         struct ldb_context *ldb;
1245         struct ldb_dn *nc_root;
1246         struct ldb_control *as_system;
1247         const struct dsdb_schema *schema;
1248         const struct dsdb_class *objectclass;
1249         struct security_descriptor *sd = NULL;
1250         struct dom_sid *sid = NULL;
1251         struct ldb_result *acl_res;
1252         static const char *acl_attrs[] = {
1253                 "nTSecurityDescriptor",
1254                 "objectClass",
1255                 "objectSid",
1256                 NULL
1257         };
1258
1259         if (ldb_dn_is_special(req->op.del.dn)) {
1260                 return ldb_next_request(module, req);
1261         }
1262
1263         as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1264         if (as_system != NULL) {
1265                 as_system->critical = 0;
1266         }
1267
1268         if (dsdb_module_am_system(module) || as_system) {
1269                 return ldb_next_request(module, req);
1270         }
1271
1272         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1273
1274         ldb = ldb_module_get_ctx(module);
1275
1276         parent = ldb_dn_get_parent(req, req->op.del.dn);
1277         if (parent == NULL) {
1278                 return ldb_oom(ldb);
1279         }
1280
1281         /* Make sure we aren't deleting a NC */
1282
1283         ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1284         if (ret != LDB_SUCCESS) {
1285                 return ret;
1286         }
1287         if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1288                 talloc_free(nc_root);
1289                 DEBUG(10,("acl:deleting a NC\n"));
1290                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1291                 return ldb_module_done(req, NULL, NULL,
1292                                        LDB_ERR_UNWILLING_TO_PERFORM);
1293         }
1294         talloc_free(nc_root);
1295
1296         ret = dsdb_module_search_dn(module, req, &acl_res,
1297                                     req->op.del.dn, acl_attrs,
1298                                     DSDB_FLAG_NEXT_MODULE |
1299                                     DSDB_FLAG_AS_SYSTEM |
1300                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1301         /* we sould be able to find the parent */
1302         if (ret != LDB_SUCCESS) {
1303                 DEBUG(10,("acl: failed to find object %s\n",
1304                           ldb_dn_get_linearized(req->op.rename.olddn)));
1305                 return ret;
1306         }
1307
1308         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1309         if (ret != LDB_SUCCESS) {
1310                 return ldb_operr(ldb);
1311         }
1312         if (!sd) {
1313                 return ldb_operr(ldb);
1314         }
1315
1316         schema = dsdb_get_schema(ldb, req);
1317         if (!schema) {
1318                 return ldb_operr(ldb);
1319         }
1320
1321         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1322
1323         objectclass = dsdb_get_structural_oc_from_msg(schema, acl_res->msgs[0]);
1324         if (!objectclass) {
1325                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1326                                  "acl_modify: Error retrieving object class for GUID.");
1327         }
1328
1329         if (ldb_request_get_control(req, LDB_CONTROL_TREE_DELETE_OID)) {
1330                 ret = acl_check_access_on_objectclass(module, req, sd, sid,
1331                                                       SEC_ADS_DELETE_TREE,
1332                                                       objectclass);
1333                 if (ret != LDB_SUCCESS) {
1334                         return ret;
1335                 }
1336
1337                 return ldb_next_request(module, req);
1338         }
1339
1340         /* First check if we have delete object right */
1341         ret = acl_check_access_on_objectclass(module, req, sd, sid,
1342                                               SEC_STD_DELETE,
1343                                               objectclass);
1344         if (ret == LDB_SUCCESS) {
1345                 return ldb_next_request(module, req);
1346         }
1347
1348         /* Nope, we don't have delete object. Lets check if we have delete
1349          * child on the parent */
1350         ret = dsdb_module_check_access_on_dn(module, req, parent,
1351                                              SEC_ADS_DELETE_CHILD,
1352                                              &objectclass->schemaIDGUID,
1353                                              req);
1354         if (ret != LDB_SUCCESS) {
1355                 return ret;
1356         }
1357
1358         return ldb_next_request(module, req);
1359 }
1360 static int acl_check_reanimate_tombstone(TALLOC_CTX *mem_ctx,
1361                                          struct ldb_module *module,
1362                                          struct ldb_request *req,
1363                                          struct ldb_dn *nc_root)
1364 {
1365         int ret;
1366         struct ldb_result *acl_res;
1367         struct security_descriptor *sd = NULL;
1368         struct dom_sid *sid = NULL;
1369         static const char *acl_attrs[] = {
1370                 "nTSecurityDescriptor",
1371                 "objectClass",
1372                 "objectSid",
1373                 NULL
1374         };
1375
1376         ret = dsdb_module_search_dn(module, mem_ctx, &acl_res,
1377                                     nc_root, acl_attrs,
1378                                     DSDB_FLAG_NEXT_MODULE |
1379                                     DSDB_FLAG_AS_SYSTEM |
1380                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1381         if (ret != LDB_SUCCESS) {
1382                 DEBUG(10,("acl: failed to find object %s\n",
1383                           ldb_dn_get_linearized(nc_root)));
1384                 return ret;
1385         }
1386
1387         ret = dsdb_get_sd_from_ldb_message(mem_ctx, req, acl_res->msgs[0], &sd);
1388         sid = samdb_result_dom_sid(mem_ctx, acl_res->msgs[0], "objectSid");
1389         if (ret != LDB_SUCCESS || !sd) {
1390                 return ldb_operr(ldb_module_get_ctx(module));
1391         }
1392         return acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
1393                                         GUID_DRS_REANIMATE_TOMBSTONE,
1394                                         SEC_ADS_CONTROL_ACCESS, sid);
1395 }
1396
1397 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1398 {
1399         int ret;
1400         struct ldb_dn *oldparent;
1401         struct ldb_dn *newparent;
1402         const struct dsdb_schema *schema;
1403         const struct dsdb_class *objectclass;
1404         const struct dsdb_attribute *attr = NULL;
1405         struct ldb_context *ldb;
1406         struct security_descriptor *sd = NULL;
1407         struct dom_sid *sid = NULL;
1408         struct ldb_result *acl_res;
1409         struct ldb_dn *nc_root;
1410         struct ldb_control *as_system;
1411         struct ldb_control *is_undelete;
1412         TALLOC_CTX *tmp_ctx;
1413         const char *rdn_name;
1414         static const char *acl_attrs[] = {
1415                 "nTSecurityDescriptor",
1416                 "objectClass",
1417                 "objectSid",
1418                 NULL
1419         };
1420
1421         if (ldb_dn_is_special(req->op.rename.olddn)) {
1422                 return ldb_next_request(module, req);
1423         }
1424
1425         as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1426         if (as_system != NULL) {
1427                 as_system->critical = 0;
1428         }
1429
1430         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1431         if (dsdb_module_am_system(module) || as_system) {
1432                 return ldb_next_request(module, req);
1433         }
1434
1435         ldb = ldb_module_get_ctx(module);
1436
1437         tmp_ctx = talloc_new(req);
1438         if (tmp_ctx == NULL) {
1439                 return ldb_oom(ldb);
1440         }
1441
1442         oldparent = ldb_dn_get_parent(tmp_ctx, req->op.rename.olddn);
1443         if (oldparent == NULL) {
1444                 return ldb_oom(ldb);
1445         }
1446         newparent = ldb_dn_get_parent(tmp_ctx, req->op.rename.newdn);
1447         if (newparent == NULL) {
1448                 return ldb_oom(ldb);
1449         }
1450
1451         /* Make sure we aren't renaming/moving a NC */
1452
1453         ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1454         if (ret != LDB_SUCCESS) {
1455                 return ret;
1456         }
1457         if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1458                 talloc_free(nc_root);
1459                 DEBUG(10,("acl:renaming/moving a NC\n"));
1460                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1461                 return ldb_module_done(req, NULL, NULL,
1462                                        LDB_ERR_UNWILLING_TO_PERFORM);
1463         }
1464
1465         /* special check for undelete operation */
1466         is_undelete = ldb_request_get_control(req, DSDB_CONTROL_RESTORE_TOMBSTONE_OID);
1467         if (is_undelete != NULL) {
1468                 is_undelete->critical = 0;
1469                 ret = acl_check_reanimate_tombstone(tmp_ctx, module, req, nc_root);
1470                 if (ret != LDB_SUCCESS) {
1471                         talloc_free(tmp_ctx);
1472                         return ret;
1473                 }
1474         }
1475         talloc_free(nc_root);
1476
1477         /* Look for the parent */
1478
1479         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1480                                     req->op.rename.olddn, acl_attrs,
1481                                     DSDB_FLAG_NEXT_MODULE |
1482                                     DSDB_FLAG_AS_SYSTEM |
1483                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1484         /* we sould be able to find the parent */
1485         if (ret != LDB_SUCCESS) {
1486                 DEBUG(10,("acl: failed to find object %s\n",
1487                           ldb_dn_get_linearized(req->op.rename.olddn)));
1488                 talloc_free(tmp_ctx);
1489                 return ret;
1490         }
1491
1492         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1493         if (ret != LDB_SUCCESS) {
1494                 talloc_free(tmp_ctx);
1495                 return ldb_operr(ldb);
1496         }
1497         if (!sd) {
1498                 talloc_free(tmp_ctx);
1499                 return ldb_operr(ldb);
1500         }
1501
1502         schema = dsdb_get_schema(ldb, acl_res);
1503         if (!schema) {
1504                 talloc_free(tmp_ctx);
1505                 return ldb_operr(ldb);
1506         }
1507
1508         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1509
1510         objectclass = dsdb_get_structural_oc_from_msg(schema, acl_res->msgs[0]);
1511         if (!objectclass) {
1512                 talloc_free(tmp_ctx);
1513                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1514                                  "acl_modify: Error retrieving object class for GUID.");
1515         }
1516
1517         attr = dsdb_attribute_by_lDAPDisplayName(schema, "name");
1518         if (attr == NULL) {
1519                 talloc_free(tmp_ctx);
1520                 return ldb_operr(ldb);
1521         }
1522
1523         ret = acl_check_access_on_attribute(module, tmp_ctx, sd, sid,
1524                                             SEC_ADS_WRITE_PROP,
1525                                             attr, objectclass);
1526         if (ret != LDB_SUCCESS) {
1527                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1528                                        "Object %s has no wp on %s\n",
1529                                        ldb_dn_get_linearized(req->op.rename.olddn),
1530                                        attr->lDAPDisplayName);
1531                 dsdb_acl_debug(sd,
1532                           acl_user_token(module),
1533                           req->op.rename.olddn,
1534                           true,
1535                           10);
1536                 talloc_free(tmp_ctx);
1537                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1538         }
1539
1540         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1541         if (rdn_name == NULL) {
1542                 talloc_free(tmp_ctx);
1543                 return ldb_operr(ldb);
1544         }
1545
1546         attr = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
1547         if (attr == NULL) {
1548                 talloc_free(tmp_ctx);
1549                 return ldb_operr(ldb);
1550         }
1551
1552         ret = acl_check_access_on_attribute(module, tmp_ctx, sd, sid,
1553                                             SEC_ADS_WRITE_PROP,
1554                                             attr, objectclass);
1555         if (ret != LDB_SUCCESS) {
1556                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1557                                        "Object %s has no wp on %s\n",
1558                                        ldb_dn_get_linearized(req->op.rename.olddn),
1559                                        attr->lDAPDisplayName);
1560                 dsdb_acl_debug(sd,
1561                           acl_user_token(module),
1562                           req->op.rename.olddn,
1563                           true,
1564                           10);
1565                 talloc_free(tmp_ctx);
1566                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1567         }
1568
1569         if (ldb_dn_compare(oldparent, newparent) == 0) {
1570                 /* regular rename, not move, nothing more to do */
1571                 talloc_free(tmp_ctx);
1572                 return ldb_next_request(module, req);
1573         }
1574
1575         /* new parent should have create child */
1576         ret = dsdb_module_check_access_on_dn(module, req, newparent,
1577                                              SEC_ADS_CREATE_CHILD,
1578                                              &objectclass->schemaIDGUID, req);
1579         if (ret != LDB_SUCCESS) {
1580                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1581                                        "acl:access_denied renaming %s",
1582                                        ldb_dn_get_linearized(req->op.rename.olddn));
1583                 talloc_free(tmp_ctx);
1584                 return ret;
1585         }
1586
1587         /* do we have delete object on the object? */
1588         /* this access is not necessary for undelete ops */
1589         if (is_undelete == NULL) {
1590                 ret = acl_check_access_on_objectclass(module, tmp_ctx, sd, sid,
1591                                                       SEC_STD_DELETE,
1592                                                       objectclass);
1593                 if (ret == LDB_SUCCESS) {
1594                         talloc_free(tmp_ctx);
1595                         return ldb_next_request(module, req);
1596                 }
1597                 /* what about delete child on the current parent */
1598                 ret = dsdb_module_check_access_on_dn(module, req, oldparent,
1599                                                      SEC_ADS_DELETE_CHILD,
1600                                                      &objectclass->schemaIDGUID,
1601                                                      req);
1602                 if (ret != LDB_SUCCESS) {
1603                         ldb_asprintf_errstring(ldb_module_get_ctx(module),
1604                                                "acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn));
1605                         talloc_free(tmp_ctx);
1606                         return ldb_module_done(req, NULL, NULL, ret);
1607                 }
1608         }
1609         talloc_free(tmp_ctx);
1610
1611         return ldb_next_request(module, req);
1612 }
1613
1614 static int acl_search_update_confidential_attrs(struct acl_context *ac,
1615                                                 struct acl_private *data)
1616 {
1617         struct dsdb_attribute *a;
1618         uint32_t n = 0;
1619
1620         if (data->acl_search) {
1621                 /*
1622                  * If acl:search is activated, the acl_read module
1623                  * protects confidential attributes.
1624                  */
1625                 return LDB_SUCCESS;
1626         }
1627
1628         if ((ac->schema == data->cached_schema_ptr) &&
1629             (ac->schema->loaded_usn == data->cached_schema_loaded_usn) &&
1630             (ac->schema->metadata_usn == data->cached_schema_metadata_usn))
1631         {
1632                 return LDB_SUCCESS;
1633         }
1634
1635         data->cached_schema_ptr = NULL;
1636         data->cached_schema_loaded_usn = 0;
1637         data->cached_schema_metadata_usn = 0;
1638         TALLOC_FREE(data->confidential_attrs);
1639
1640         if (ac->schema == NULL) {
1641                 return LDB_SUCCESS;
1642         }
1643
1644         for (a = ac->schema->attributes; a; a = a->next) {
1645                 const char **attrs = data->confidential_attrs;
1646
1647                 if (!(a->searchFlags & SEARCH_FLAG_CONFIDENTIAL)) {
1648                         continue;
1649                 }
1650
1651                 attrs = talloc_realloc(data, attrs, const char *, n + 2);
1652                 if (attrs == NULL) {
1653                         TALLOC_FREE(data->confidential_attrs);
1654                         return ldb_module_oom(ac->module);
1655                 }
1656
1657                 attrs[n] = a->lDAPDisplayName;
1658                 attrs[n+1] = NULL;
1659                 n++;
1660
1661                 data->confidential_attrs = attrs;
1662         }
1663
1664         data->cached_schema_ptr = ac->schema;
1665         data->cached_schema_loaded_usn = ac->schema->loaded_usn;
1666         data->cached_schema_metadata_usn = ac->schema->metadata_usn;
1667
1668         return LDB_SUCCESS;
1669 }
1670
1671 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1672 {
1673         struct acl_context *ac;
1674         struct acl_private *data;
1675         struct ldb_result *acl_res;
1676         static const char *acl_attrs[] = {
1677                 "objectClass",
1678                 "nTSecurityDescriptor",
1679                 "objectSid",
1680                 NULL
1681         };
1682         int ret;
1683         unsigned int i;
1684
1685         ac = talloc_get_type(req->context, struct acl_context);
1686         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1687         if (!ares) {
1688                 return ldb_module_done(ac->req, NULL, NULL,
1689                                        LDB_ERR_OPERATIONS_ERROR);
1690         }
1691         if (ares->error != LDB_SUCCESS) {
1692                 return ldb_module_done(ac->req, ares->controls,
1693                                        ares->response, ares->error);
1694         }
1695
1696         switch (ares->type) {
1697         case LDB_REPLY_ENTRY:
1698                 if (ac->constructed_attrs) {
1699                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1700                                                     acl_attrs,
1701                                                     DSDB_FLAG_NEXT_MODULE |
1702                                                     DSDB_FLAG_AS_SYSTEM |
1703                                                     DSDB_SEARCH_SHOW_RECYCLED,
1704                                                     req);
1705                         if (ret != LDB_SUCCESS) {
1706                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1707                         }
1708                 }
1709
1710                 if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1711                         ret = acl_allowedAttributes(ac->module, ac->schema,
1712                                                     acl_res->msgs[0],
1713                                                     ares->message, ac);
1714                         if (ret != LDB_SUCCESS) {
1715                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1716                         }
1717                 }
1718
1719                 if (ac->allowedChildClasses) {
1720                         ret = acl_childClasses(ac->module, ac->schema,
1721                                                acl_res->msgs[0],
1722                                                ares->message,
1723                                                "allowedChildClasses");
1724                         if (ret != LDB_SUCCESS) {
1725                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1726                         }
1727                 }
1728
1729                 if (ac->allowedChildClassesEffective) {
1730                         ret = acl_childClassesEffective(ac->module, ac->schema,
1731                                                         acl_res->msgs[0],
1732                                                         ares->message, ac);
1733                         if (ret != LDB_SUCCESS) {
1734                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1735                         }
1736                 }
1737
1738                 if (ac->sDRightsEffective) {
1739                         ret = acl_sDRightsEffective(ac->module,
1740                                                     acl_res->msgs[0],
1741                                                     ares->message, ac);
1742                         if (ret != LDB_SUCCESS) {
1743                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1744                         }
1745                 }
1746
1747                 if (data == NULL) {
1748                         return ldb_module_send_entry(ac->req, ares->message,
1749                                                      ares->controls);
1750                 }
1751
1752                 if (ac->am_system) {
1753                         return ldb_module_send_entry(ac->req, ares->message,
1754                                                      ares->controls);
1755                 }
1756
1757                 if (data->password_attrs != NULL) {
1758                         for (i = 0; data->password_attrs[i]; i++) {
1759                                 if ((!ac->userPassword) &&
1760                                     (ldb_attr_cmp(data->password_attrs[i],
1761                                                   "userPassword") == 0))
1762                                 {
1763                                                 continue;
1764                                 }
1765
1766                                 ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1767                         }
1768                 }
1769
1770                 if (ac->am_administrator) {
1771                         return ldb_module_send_entry(ac->req, ares->message,
1772                                                      ares->controls);
1773                 }
1774
1775                 ret = acl_search_update_confidential_attrs(ac, data);
1776                 if (ret != LDB_SUCCESS) {
1777                         return ret;
1778                 }
1779
1780                 if (data->confidential_attrs != NULL) {
1781                         for (i = 0; data->confidential_attrs[i]; i++) {
1782                                 ldb_msg_remove_attr(ares->message,
1783                                                     data->confidential_attrs[i]);
1784                         }
1785                 }
1786
1787                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1788
1789         case LDB_REPLY_REFERRAL:
1790                 return ldb_module_send_referral(ac->req, ares->referral);
1791
1792         case LDB_REPLY_DONE:
1793                 return ldb_module_done(ac->req, ares->controls,
1794                                        ares->response, LDB_SUCCESS);
1795
1796         }
1797         return LDB_SUCCESS;
1798 }
1799
1800 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1801 {
1802         struct ldb_context *ldb;
1803         struct acl_context *ac;
1804         struct ldb_parse_tree *down_tree;
1805         struct ldb_request *down_req;
1806         struct acl_private *data;
1807         int ret;
1808         unsigned int i;
1809
1810         if (ldb_dn_is_special(req->op.search.base)) {
1811                 return ldb_next_request(module, req);
1812         }
1813
1814         ldb = ldb_module_get_ctx(module);
1815
1816         ac = talloc_zero(req, struct acl_context);
1817         if (ac == NULL) {
1818                 return ldb_oom(ldb);
1819         }
1820         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1821
1822         ac->module = module;
1823         ac->req = req;
1824         ac->am_system = dsdb_module_am_system(module);
1825         ac->am_administrator = dsdb_module_am_administrator(module);
1826         ac->constructed_attrs = false;
1827         ac->modify_search = true;
1828         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1829         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1830         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1831         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1832         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1833         ac->userPassword = true;
1834         ac->schema = dsdb_get_schema(ldb, ac);
1835
1836         ac->constructed_attrs |= ac->allowedAttributes;
1837         ac->constructed_attrs |= ac->allowedChildClasses;
1838         ac->constructed_attrs |= ac->allowedChildClassesEffective;
1839         ac->constructed_attrs |= ac->allowedAttributesEffective;
1840         ac->constructed_attrs |= ac->sDRightsEffective;
1841
1842         if (data == NULL) {
1843                 ac->modify_search = false;
1844         }
1845         if (ac->am_system) {
1846                 ac->modify_search = false;
1847         }
1848
1849         if (!ac->constructed_attrs && !ac->modify_search) {
1850                 talloc_free(ac);
1851                 return ldb_next_request(module, req);
1852         }
1853
1854         if (!ac->am_system) {
1855                 ac->userPassword = dsdb_user_password_support(module, ac, req);
1856         }
1857
1858         ret = acl_search_update_confidential_attrs(ac, data);
1859         if (ret != LDB_SUCCESS) {
1860                 return ret;
1861         }
1862
1863         down_tree = ldb_parse_tree_copy_shallow(ac, req->op.search.tree);
1864         if (down_tree == NULL) {
1865                 return ldb_oom(ldb);
1866         }
1867
1868         if (!ac->am_system && data->password_attrs) {
1869                 for (i = 0; data->password_attrs[i]; i++) {
1870                         if ((!ac->userPassword) &&
1871                             (ldb_attr_cmp(data->password_attrs[i],
1872                                           "userPassword") == 0))
1873                         {
1874                                 continue;
1875                         }
1876
1877                         ldb_parse_tree_attr_replace(down_tree,
1878                                                     data->password_attrs[i],
1879                                                     "kludgeACLredactedattribute");
1880                 }
1881         }
1882
1883         if (!ac->am_system && !ac->am_administrator && data->confidential_attrs) {
1884                 for (i = 0; data->confidential_attrs[i]; i++) {
1885                         ldb_parse_tree_attr_replace(down_tree,
1886                                                     data->confidential_attrs[i],
1887                                                     "kludgeACLredactedattribute");
1888                 }
1889         }
1890
1891         ret = ldb_build_search_req_ex(&down_req,
1892                                       ldb, ac,
1893                                       req->op.search.base,
1894                                       req->op.search.scope,
1895                                       down_tree,
1896                                       req->op.search.attrs,
1897                                       req->controls,
1898                                       ac, acl_search_callback,
1899                                       req);
1900         LDB_REQ_SET_LOCATION(down_req);
1901         if (ret != LDB_SUCCESS) {
1902                 return ret;
1903         }
1904         /* perform the search */
1905         return ldb_next_request(module, down_req);
1906 }
1907
1908 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1909 {
1910         struct ldb_context *ldb = ldb_module_get_ctx(module);
1911         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1912
1913         /* allow everybody to read the sequence number */
1914         if (strcmp(req->op.extended.oid,
1915                    LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1916                 return ldb_next_request(module, req);
1917         }
1918
1919         if (dsdb_module_am_system(module) ||
1920             dsdb_module_am_administrator(module) || as_system) {
1921                 return ldb_next_request(module, req);
1922         } else {
1923                 ldb_asprintf_errstring(ldb,
1924                                        "acl_extended: "
1925                                        "attempted database modify not permitted. "
1926                                        "User %s is not SYSTEM or an administrator",
1927                                        acl_user_name(req, module));
1928                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1929         }
1930 }
1931
1932 static const struct ldb_module_ops ldb_acl_module_ops = {
1933         .name              = "acl",
1934         .search            = acl_search,
1935         .add               = acl_add,
1936         .modify            = acl_modify,
1937         .del               = acl_delete,
1938         .rename            = acl_rename,
1939         .extended          = acl_extended,
1940         .init_context      = acl_module_init
1941 };
1942
1943 int ldb_acl_module_init(const char *version)
1944 {
1945         LDB_MODULE_CHECK_VERSION(version);
1946         return ldb_register_module(&ldb_acl_module_ops);
1947 }