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         bool userPassword_support;
  59 };
  60
  61 struct acl_context {
  62         struct ldb_module *module;
  63         struct ldb_request *req;
  64         bool am_system;
  65         bool am_administrator;
  66         bool modify_search;
  67         bool constructed_attrs;
  68         bool allowedAttributes;
  69         bool allowedAttributesEffective;
  70         bool allowedChildClasses;
  71         bool allowedChildClassesEffective;
  72         bool sDRightsEffective;
  73         bool userPassword;
  74         const char * const *attrs;
  75         struct dsdb_schema *schema;
  76 };
  77
  78 static int acl_module_init(struct ldb_module *module)
  79 {
  80         struct ldb_context *ldb;
  81         struct acl_private *data;
  82         int ret;
  83         unsigned int i, n, j;
  84         TALLOC_CTX *mem_ctx;
  85         static const char * const attrs[] = { "passwordAttribute", NULL };
  86         static const char * const secret_attrs[] = {
  87                 DSDB_SECRET_ATTRIBUTES
  88         };
  89         struct ldb_result *res;
  90         struct ldb_message *msg;
  91         struct ldb_message_element *password_attributes;
  92
  93         ldb = ldb_module_get_ctx(module);
  94
  95         ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
  96         if (ret != LDB_SUCCESS) {
  97                 ldb_debug(ldb, LDB_DEBUG_ERROR,
  98                           "acl_module_init: Unable to register control with rootdse!\n");
  99                 return ldb_operr(ldb);
 100         }
 101
 102         data = talloc_zero(module, struct acl_private);
 103         if (data == NULL) {
 104                 return ldb_oom(ldb);
 105         }
 106
 107         data->acl_search = lpcfg_parm_bool(ldb_get_opaque(ldb, "loadparm"),
 108                                         NULL, "acl", "search", true);
 109         ldb_module_set_private(module, data);
 110
 111         data->userPassword_support = dsdb_user_password_support(module, module, NULL);
 112
 113         mem_ctx = talloc_new(module);
 114         if (!mem_ctx) {
 115                 return ldb_oom(ldb);
 116         }
 117
 118         ret = dsdb_module_search_dn(module, mem_ctx, &res,
 119                                     ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
 120                                     attrs,
 121                                     DSDB_FLAG_NEXT_MODULE |
 122                                     DSDB_FLAG_AS_SYSTEM,
 123                                     NULL);
 124         if (ret != LDB_SUCCESS) {
 125                 goto done;
 126         }
 127         if (res->count == 0) {
 128                 goto done;
 129         }
 130
 131         if (res->count > 1) {
 132                 talloc_free(mem_ctx);
 133                 return LDB_ERR_CONSTRAINT_VIOLATION;
 134         }
 135
 136         msg = res->msgs[0];
 137
 138         password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
 139         if (!password_attributes) {
 140                 goto done;
 141         }
 142         data->password_attrs = talloc_array(data, const char *,
 143                         password_attributes->num_values +
 144                         ARRAY_SIZE(secret_attrs) + 1);
 145         if (!data->password_attrs) {
 146                 talloc_free(mem_ctx);
 147                 return ldb_oom(ldb);
 148         }
 149
 150         n = 0;
 151         for (i=0; i < password_attributes->num_values; i++) {
 152                 data->password_attrs[n] = (const char *)password_attributes->values[i].data;
 153                 talloc_steal(data->password_attrs, password_attributes->values[i].data);
 154                 n++;
 155         }
 156
 157         for (i=0; i < ARRAY_SIZE(secret_attrs); i++) {
 158                 bool found = false;
 159
 160                 for (j=0; j < n; j++) {
 161                         if (strcasecmp(data->password_attrs[j], secret_attrs[i]) == 0) {
 162                                 found = true;
 163                                 break;
 164                         }
 165                 }
 166
 167                 if (found) {
 168                         continue;
 169                 }
 170
 171                 data->password_attrs[n] = talloc_strdup(data->password_attrs,
 172                                                         secret_attrs[i]);
 173                 if (data->password_attrs[n] == NULL) {
 174                         talloc_free(mem_ctx);
 175                         return ldb_oom(ldb);
 176                 }
 177                 n++;
 178         }
 179         data->password_attrs[n] = NULL;
 180
 181 done:
 182         talloc_free(mem_ctx);
 183         return ldb_next_init(module);
 184 }
 185
 186 static int acl_allowedAttributes(struct ldb_module *module,
 187                                  const struct dsdb_schema *schema,
 188                                  struct ldb_message *sd_msg,
 189                                  struct ldb_message *msg,
 190                                  struct acl_context *ac)
 191 {
 192         struct ldb_message_element *oc_el;
 193         struct ldb_context *ldb = ldb_module_get_ctx(module);
 194         TALLOC_CTX *mem_ctx;
 195         const char **attr_list;
 196         int i, ret;
 197         const struct dsdb_class *objectclass;
 198
 199         /* If we don't have a schema yet, we can't do anything... */
 200         if (schema == NULL) {
 201                 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 202                 return LDB_ERR_OPERATIONS_ERROR;
 203         }
 204
 205         /* Must remove any existing attribute */
 206         if (ac->allowedAttributes) {
 207                 ldb_msg_remove_attr(msg, "allowedAttributes");
 208         }
 209
 210         mem_ctx = talloc_new(msg);
 211         if (!mem_ctx) {
 212                 return ldb_oom(ldb);
 213         }
 214
 215         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 216         attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
 217         if (!attr_list) {
 218                 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
 219                 talloc_free(mem_ctx);
 220                 return LDB_ERR_OPERATIONS_ERROR;
 221         }
 222
 223         /*
 224          * Get the top-most structural object class for the ACL check
 225          */
 226         objectclass = dsdb_get_last_structural_class(ac->schema,
 227                                                      oc_el);
 228         if (objectclass == NULL) {
 229                 ldb_asprintf_errstring(ldb, "acl_read: Failed to find a structural class for %s",
 230                                        ldb_dn_get_linearized(sd_msg->dn));
 231                 talloc_free(mem_ctx);
 232                 return LDB_ERR_OPERATIONS_ERROR;
 233         }
 234
 235         if (ac->allowedAttributes) {
 236                 for (i=0; attr_list && attr_list[i]; i++) {
 237                         ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
 238                 }
 239         }
 240         if (ac->allowedAttributesEffective) {
 241                 struct security_descriptor *sd;
 242                 struct dom_sid *sid = NULL;
 243                 struct ldb_control *as_system = ldb_request_get_control(ac->req,
 244                                                                         LDB_CONTROL_AS_SYSTEM_OID);
 245
 246                 if (as_system != NULL) {
 247                         as_system->critical = 0;
 248                 }
 249
 250                 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
 251                 if (ac->am_system || as_system) {
 252                         for (i=0; attr_list && attr_list[i]; i++) {
 253                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 254                         }
 255                         return LDB_SUCCESS;
 256                 }
 257
 258                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), mem_ctx, sd_msg, &sd);
 259
 260                 if (ret != LDB_SUCCESS) {
 261                         return ret;
 262                 }
 263
 264                 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
 265                 for (i=0; attr_list && attr_list[i]; i++) {
 266                         const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
 267                                                                                         attr_list[i]);
 268                         if (!attr) {
 269                                 return ldb_operr(ldb);
 270                         }
 271                         /* remove constructed attributes */
 272                         if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
 273                             || attr->systemOnly
 274                             || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
 275                                 continue;
 276                         }
 277                         ret = acl_check_access_on_attribute(module,
 278                                                             msg,
 279                                                             sd,
 280                                                             sid,
 281                                                             SEC_ADS_WRITE_PROP,
 282                                                             attr,
 283                                                             objectclass);
 284                         if (ret == LDB_SUCCESS) {
 285                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 286                         }
 287                 }
 288         }
 289         return LDB_SUCCESS;
 290 }
 291
 292 static int acl_childClasses(struct ldb_module *module,
 293                             const struct dsdb_schema *schema,
 294                             struct ldb_message *sd_msg,
 295                             struct ldb_message *msg,
 296                             const char *attrName)
 297 {
 298         struct ldb_message_element *oc_el;
 299         struct ldb_message_element *allowedClasses;
 300         const struct dsdb_class *sclass;
 301         unsigned int i, j;
 302         int ret;
 303
 304         /* If we don't have a schema yet, we can't do anything... */
 305         if (schema == NULL) {
 306                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 307                 return LDB_ERR_OPERATIONS_ERROR;
 308         }
 309
 310         /* Must remove any existing attribute, or else confusion reins */
 311         ldb_msg_remove_attr(msg, attrName);
 312         ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
 313         if (ret != LDB_SUCCESS) {
 314                 return ret;
 315         }
 316
 317         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 318
 319         for (i=0; oc_el && i < oc_el->num_values; i++) {
 320                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 321                 if (!sclass) {
 322                         /* We don't know this class?  what is going on? */
 323                         continue;
 324                 }
 325
 326                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 327                         ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
 328                 }
 329         }
 330         if (allowedClasses->num_values > 1) {
 331                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 332                 for (i=1 ; i < allowedClasses->num_values; i++) {
 333                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 334                         struct ldb_val *val2 = &allowedClasses->values[i];
 335                         if (data_blob_cmp(val1, val2) == 0) {
 336                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
 337                                 allowedClasses->num_values--;
 338                                 i--;
 339                         }
 340                 }
 341         }
 342
 343         return LDB_SUCCESS;
 344 }
 345
 346 static int acl_childClassesEffective(struct ldb_module *module,
 347                                      const struct dsdb_schema *schema,
 348                                      struct ldb_message *sd_msg,
 349                                      struct ldb_message *msg,
 350                                      struct acl_context *ac)
 351 {
 352         struct ldb_message_element *oc_el;
 353         struct ldb_message_element *allowedClasses = NULL;
 354         const struct dsdb_class *sclass;
 355         struct security_descriptor *sd;
 356         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 357                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 358         struct dom_sid *sid = NULL;
 359         unsigned int i, j;
 360         int ret;
 361
 362         if (as_system != NULL) {
 363                 as_system->critical = 0;
 364         }
 365
 366         if (ac->am_system || as_system) {
 367                 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
 368         }
 369
 370         /* If we don't have a schema yet, we can't do anything... */
 371         if (schema == NULL) {
 372                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 373                 return LDB_ERR_OPERATIONS_ERROR;
 374         }
 375
 376         /* Must remove any existing attribute, or else confusion reins */
 377         ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
 378
 379         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 380         ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 381         if (ret != LDB_SUCCESS) {
 382                 return ret;
 383         }
 384
 385         sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 386         for (i=0; oc_el && i < oc_el->num_values; i++) {
 387                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 388                 if (!sclass) {
 389                         /* We don't know this class?  what is going on? */
 390                         continue;
 391                 }
 392
 393                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 394                         const struct dsdb_class *sc;
 395
 396                         sc = dsdb_class_by_lDAPDisplayName(schema,
 397                                                            sclass->possibleInferiors[j]);
 398                         if (!sc) {
 399                                 /* We don't know this class?  what is going on? */
 400                                 continue;
 401                         }
 402
 403                         ret = acl_check_access_on_objectclass(module, ac,
 404                                                               sd, sid,
 405                                                               SEC_ADS_CREATE_CHILD,
 406                                                               sc);
 407                         if (ret == LDB_SUCCESS) {
 408                                 ldb_msg_add_string(msg, "allowedChildClassesEffective",
 409                                                    sclass->possibleInferiors[j]);
 410                         }
 411                 }
 412         }
 413         allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
 414         if (!allowedClasses) {
 415                 return LDB_SUCCESS;
 416         }
 417
 418         if (allowedClasses->num_values > 1) {
 419                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 420                 for (i=1 ; i < allowedClasses->num_values; i++) {
 421                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 422                         struct ldb_val *val2 = &allowedClasses->values[i];
 423                         if (data_blob_cmp(val1, val2) == 0) {
 424                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
 425                                 allowedClasses->num_values--;
 426                                 i--;
 427                         }
 428                 }
 429         }
 430         return LDB_SUCCESS;
 431 }
 432
 433 static int acl_sDRightsEffective(struct ldb_module *module,
 434                                  struct ldb_message *sd_msg,
 435                                  struct ldb_message *msg,
 436                                  struct acl_context *ac)
 437 {
 438         struct ldb_context *ldb = ldb_module_get_ctx(module);
 439         struct ldb_message_element *rightsEffective;
 440         int ret;
 441         struct security_descriptor *sd;
 442         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 443                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 444         struct dom_sid *sid = NULL;
 445         uint32_t flags = 0;
 446
 447         if (as_system != NULL) {
 448                 as_system->critical = 0;
 449         }
 450
 451         /* Must remove any existing attribute, or else confusion reins */
 452         ldb_msg_remove_attr(msg, "sDRightsEffective");
 453         ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
 454         if (ret != LDB_SUCCESS) {
 455                 return ret;
 456         }
 457         if (ac->am_system || as_system) {
 458                 flags = SECINFO_OWNER | SECINFO_GROUP |  SECINFO_SACL |  SECINFO_DACL;
 459         } else {
 460                 const struct dsdb_class *objectclass;
 461                 const struct dsdb_attribute *attr;
 462
 463                 objectclass = dsdb_get_structural_oc_from_msg(ac->schema, sd_msg);
 464                 if (objectclass == NULL) {
 465                         return ldb_operr(ldb);
 466                 }
 467
 468                 attr = dsdb_attribute_by_lDAPDisplayName(ac->schema,
 469                                                          "nTSecurityDescriptor");
 470                 if (attr == NULL) {
 471                         return ldb_operr(ldb);
 472                 }
 473
 474                 /* Get the security descriptor from the message */
 475                 ret = dsdb_get_sd_from_ldb_message(ldb, msg, sd_msg, &sd);
 476                 if (ret != LDB_SUCCESS) {
 477                         return ret;
 478                 }
 479                 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 480                 ret = acl_check_access_on_attribute(module,
 481                                                     msg,
 482                                                     sd,
 483                                                     sid,
 484                                                     SEC_STD_WRITE_OWNER,
 485                                                     attr,
 486                                                     objectclass);
 487                 if (ret == LDB_SUCCESS) {
 488                         flags |= SECINFO_OWNER | SECINFO_GROUP;
 489                 }
 490                 ret = acl_check_access_on_attribute(module,
 491                                                     msg,
 492                                                     sd,
 493                                                     sid,
 494                                                     SEC_STD_WRITE_DAC,
 495                                                     attr,
 496                                                     objectclass);
 497                 if (ret == LDB_SUCCESS) {
 498                         flags |= SECINFO_DACL;
 499                 }
 500                 ret = acl_check_access_on_attribute(module,
 501                                                     msg,
 502                                                     sd,
 503                                                     sid,
 504                                                     SEC_FLAG_SYSTEM_SECURITY,
 505                                                     attr,
 506                                                     objectclass);
 507                 if (ret == LDB_SUCCESS) {
 508                         flags |= SECINFO_SACL;
 509                 }
 510         }
 511         return samdb_msg_add_uint(ldb_module_get_ctx(module), msg, msg,
 512                                   "sDRightsEffective", flags);
 513 }
 514
 515 static int acl_validate_spn_value(TALLOC_CTX *mem_ctx,
 516                                   struct ldb_context *ldb,
 517                                   const char *spn_value,
 518                                   uint32_t userAccountControl,
 519                                   const char *samAccountName,
 520                                   const char *dnsHostName,
 521                                   const char *netbios_name,
 522                                   const char *ntds_guid)
 523 {
 524         int ret, princ_size;
 525         krb5_context krb_ctx;
 526         krb5_error_code kerr;
 527         krb5_principal principal;
 528         char *instanceName;
 529         char *serviceType;
 530         char *serviceName;
 531         const char *forest_name = samdb_forest_name(ldb, mem_ctx);
 532         const char *base_domain = samdb_default_domain_name(ldb, mem_ctx);
 533         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
 534                                                           struct loadparm_context);
 535         bool is_dc = (userAccountControl & UF_SERVER_TRUST_ACCOUNT) ||
 536                 (userAccountControl & UF_PARTIAL_SECRETS_ACCOUNT);
 537
 538         if (strcasecmp_m(spn_value, samAccountName) == 0) {
 539                 /* MacOS X sets this value, and setting an SPN of your
 540                  * own samAccountName is both pointless and safe */
 541                 return LDB_SUCCESS;
 542         }
 543
 544         kerr = smb_krb5_init_context_basic(mem_ctx,
 545                                            lp_ctx,
 546                                            &krb_ctx);
 547         if (kerr != 0) {
 548                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 549                                  "Could not initialize kerberos context.");
 550         }
 551
 552         ret = krb5_parse_name(krb_ctx, spn_value, &principal);
 553         if (ret) {
 554                 krb5_free_context(krb_ctx);
 555                 return LDB_ERR_CONSTRAINT_VIOLATION;
 556         }
 557
 558         princ_size = krb5_princ_size(krb_ctx, principal);
 559         if (princ_size < 2) {
 560                 DBG_WARNING("princ_size=%d\n", princ_size);
 561                 goto fail;
 562         }
 563
 564         instanceName = smb_krb5_principal_get_comp_string(mem_ctx, krb_ctx,
 565                                                           principal, 1);
 566         serviceType = smb_krb5_principal_get_comp_string(mem_ctx, krb_ctx,
 567                                                          principal, 0);
 568         if (krb5_princ_size(krb_ctx, principal) == 3) {
 569                 serviceName = smb_krb5_principal_get_comp_string(mem_ctx, krb_ctx,
 570                                                                  principal, 2);
 571         } else {
 572                 serviceName = NULL;
 573         }
 574
 575         if (serviceName) {
 576                 if (!is_dc) {
 577                         DBG_WARNING("is_dc=false, serviceName=%s,"
 578                                     "serviceType=%s\n", serviceName,
 579                                   serviceType);
 580                         goto fail;
 581                 }
 582                 if (strcasecmp(serviceType, "ldap") == 0) {
 583                         if (strcasecmp(serviceName, netbios_name) != 0 &&
 584                             strcasecmp(serviceName, forest_name) != 0) {
 585                                 DBG_WARNING("serviceName=%s\n", serviceName);
 586                                 goto fail;
 587                         }
 588
 589                 } else if (strcasecmp(serviceType, "gc") == 0) {
 590                         if (strcasecmp(serviceName, forest_name) != 0) {
 591                                 DBG_WARNING("serviceName=%s\n", serviceName);
 592                                 goto fail;
 593                         }
 594                 } else {
 595                         if (strcasecmp(serviceName, base_domain) != 0 &&
 596                             strcasecmp(serviceName, netbios_name) != 0) {
 597                                 DBG_WARNING("serviceType=%s, "
 598                                             "serviceName=%s\n",
 599                                             serviceType, serviceName);
 600                                 goto fail;
 601                         }
 602                 }
 603         }
 604         /* instanceName can be samAccountName without $ or dnsHostName
 605          * or "ntds_guid._msdcs.forest_domain for DC objects */
 606         if (strlen(instanceName) == (strlen(samAccountName) - 1)
 607             && strncasecmp(instanceName, samAccountName,
 608                            strlen(samAccountName) - 1) == 0) {
 609                 goto success;
 610         }
 611         if ((dnsHostName != NULL) &&
 612             (strcasecmp(instanceName, dnsHostName) == 0)) {
 613                 goto success;
 614         }
 615         if (is_dc) {
 616                 const char *guid_str;
 617                 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
 618                                            ntds_guid,
 619                                            forest_name);
 620                 if (strcasecmp(instanceName, guid_str) == 0) {
 621                         goto success;
 622                 }
 623         }
 624
 625 fail:
 626         krb5_free_principal(krb_ctx, principal);
 627         krb5_free_context(krb_ctx);
 628         ldb_debug_set(ldb, LDB_DEBUG_WARNING,
 629                       "acl: spn validation failed for "
 630                       "spn[%s] uac[0x%x] account[%s] hostname[%s] "
 631                       "nbname[%s] ntds[%s] forest[%s] domain[%s]\n",
 632                       spn_value, (unsigned)userAccountControl,
 633                       samAccountName, dnsHostName,
 634                       netbios_name, ntds_guid,
 635                       forest_name, base_domain);
 636         return LDB_ERR_CONSTRAINT_VIOLATION;
 637
 638 success:
 639         krb5_free_principal(krb_ctx, principal);
 640         krb5_free_context(krb_ctx);
 641         return LDB_SUCCESS;
 642 }
 643
 644 static int acl_check_spn(TALLOC_CTX *mem_ctx,
 645                          struct ldb_module *module,
 646                          struct ldb_request *req,
 647                          struct security_descriptor *sd,
 648                          struct dom_sid *sid,
 649                          const struct dsdb_attribute *attr,
 650                          const struct dsdb_class *objectclass)
 651 {
 652         int ret;
 653         unsigned int i;
 654         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 655         struct ldb_context *ldb = ldb_module_get_ctx(module);
 656         struct ldb_result *acl_res;
 657         struct ldb_result *netbios_res;
 658         struct ldb_message_element *el;
 659         struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
 660         uint32_t userAccountControl;
 661         const char *samAccountName;
 662         const char *dnsHostName;
 663         const char *netbios_name;
 664         struct GUID ntds;
 665         char *ntds_guid = NULL;
 666
 667         static const char *acl_attrs[] = {
 668                 "samAccountName",
 669                 "dnsHostName",
 670                 "userAccountControl",
 671                 NULL
 672         };
 673         static const char *netbios_attrs[] = {
 674                 "nETBIOSName",
 675                 NULL
 676         };
 677
 678         /* if we have wp, we can do whatever we like */
 679         if (acl_check_access_on_attribute(module,
 680                                           tmp_ctx,
 681                                           sd,
 682                                           sid,
 683                                           SEC_ADS_WRITE_PROP,
 684                                           attr, objectclass) == LDB_SUCCESS) {
 685                 talloc_free(tmp_ctx);
 686                 return LDB_SUCCESS;
 687         }
 688
 689         ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 690                                        GUID_DRS_VALIDATE_SPN,
 691                                        SEC_ADS_SELF_WRITE,
 692                                        sid);
 693
 694         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 695                 dsdb_acl_debug(sd, acl_user_token(module),
 696                                req->op.mod.message->dn,
 697                                true,
 698                                10);
 699                 talloc_free(tmp_ctx);
 700                 return ret;
 701         }
 702
 703         ret = dsdb_module_search_dn(module, tmp_ctx,
 704                                     &acl_res, req->op.mod.message->dn,
 705                                     acl_attrs,
 706                                     DSDB_FLAG_NEXT_MODULE |
 707                                     DSDB_FLAG_AS_SYSTEM |
 708                                     DSDB_SEARCH_SHOW_RECYCLED,
 709                                     req);
 710         if (ret != LDB_SUCCESS) {
 711                 talloc_free(tmp_ctx);
 712                 return ret;
 713         }
 714
 715         userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
 716         dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
 717         samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
 718
 719         ret = dsdb_module_search(module, tmp_ctx,
 720                                  &netbios_res, partitions_dn,
 721                                  LDB_SCOPE_ONELEVEL,
 722                                  netbios_attrs,
 723                                  DSDB_FLAG_NEXT_MODULE |
 724                                  DSDB_FLAG_AS_SYSTEM,
 725                                  req,
 726                                  "(ncName=%s)",
 727                                  ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
 728
 729         netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
 730
 731         el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
 732         if (!el) {
 733                 talloc_free(tmp_ctx);
 734                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 735                                          "Error finding element for servicePrincipalName.");
 736         }
 737
 738         /* NTDSDSA objectGuid of object we are checking SPN for */
 739         if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
 740                 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
 741                                                              req->op.mod.message->dn, &ntds, req);
 742                 if (ret != LDB_SUCCESS) {
 743                         ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
 744                                                ldb_dn_get_linearized(req->op.mod.message->dn),
 745                                                ldb_strerror(ret));
 746                         talloc_free(tmp_ctx);
 747                         return LDB_ERR_OPERATIONS_ERROR;
 748                 }
 749                 ntds_guid = GUID_string(tmp_ctx, &ntds);
 750         }
 751
 752         for (i=0; i < el->num_values; i++) {
 753                 ret = acl_validate_spn_value(tmp_ctx,
 754                                              ldb,
 755                                              (char *)el->values[i].data,
 756                                              userAccountControl,
 757                                              samAccountName,
 758                                              dnsHostName,
 759                                              netbios_name,
 760                                              ntds_guid);
 761                 if (ret != LDB_SUCCESS) {
 762                         talloc_free(tmp_ctx);
 763                         return ret;
 764                 }
 765         }
 766         talloc_free(tmp_ctx);
 767         return LDB_SUCCESS;
 768 }
 769
 770 static int acl_add(struct ldb_module *module, struct ldb_request *req)
 771 {
 772         int ret;
 773         struct ldb_dn *parent;
 774         struct ldb_context *ldb;
 775         const struct dsdb_schema *schema;
 776         const struct dsdb_class *objectclass;
 777         struct ldb_control *as_system;
 778         struct ldb_message_element *el;
 779         unsigned int instanceType = 0;
 780
 781         if (ldb_dn_is_special(req->op.add.message->dn)) {
 782                 return ldb_next_request(module, req);
 783         }
 784
 785         as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 786         if (as_system != NULL) {
 787                 as_system->critical = 0;
 788         }
 789
 790         if (dsdb_module_am_system(module) || as_system) {
 791                 return ldb_next_request(module, req);
 792         }
 793
 794         ldb = ldb_module_get_ctx(module);
 795
 796         parent = ldb_dn_get_parent(req, req->op.add.message->dn);
 797         if (parent == NULL) {
 798                 return ldb_oom(ldb);
 799         }
 800
 801         schema = dsdb_get_schema(ldb, req);
 802         if (!schema) {
 803                 return ldb_operr(ldb);
 804         }
 805
 806         objectclass = dsdb_get_structural_oc_from_msg(schema, req->op.add.message);
 807         if (!objectclass) {
 808                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
 809                                        "acl: unable to find or validate structural objectClass on %s\n",
 810                                        ldb_dn_get_linearized(req->op.add.message->dn));
 811                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 812         }
 813
 814         el = ldb_msg_find_element(req->op.add.message, "instanceType");
 815         if ((el != NULL) && (el->num_values != 1)) {
 816                 ldb_set_errstring(ldb, "acl: the 'instanceType' attribute is single-valued!");
 817                 return LDB_ERR_UNWILLING_TO_PERFORM;
 818         }
 819
 820         instanceType = ldb_msg_find_attr_as_uint(req->op.add.message,
 821                                                  "instanceType", 0);
 822         if (instanceType & INSTANCE_TYPE_IS_NC_HEAD) {
 823                 static const char *no_attrs[] = { NULL };
 824                 struct ldb_result *partition_res;
 825                 struct ldb_dn *partitions_dn;
 826
 827                 partitions_dn = samdb_partitions_dn(ldb, req);
 828                 if (!partitions_dn) {
 829                         ldb_set_errstring(ldb, "acl: CN=partitions dn could not be generated!");
 830                         return LDB_ERR_UNWILLING_TO_PERFORM;
 831                 }
 832
 833                 ret = dsdb_module_search(module, req, &partition_res,
 834                                          partitions_dn, LDB_SCOPE_ONELEVEL,
 835                                          no_attrs,
 836                                          DSDB_FLAG_NEXT_MODULE |
 837                                          DSDB_FLAG_AS_SYSTEM |
 838                                          DSDB_SEARCH_ONE_ONLY |
 839                                          DSDB_SEARCH_SHOW_RECYCLED,
 840                                          req,
 841                                          "(&(nCName=%s)(objectClass=crossRef))",
 842                                          ldb_dn_get_linearized(req->op.add.message->dn));
 843
 844                 if (ret == LDB_SUCCESS) {
 845                         /* Check that we can write to the crossRef object MS-ADTS 3.1.1.5.2.8.2 */
 846                         ret = dsdb_module_check_access_on_dn(module, req, partition_res->msgs[0]->dn,
 847                                                              SEC_ADS_WRITE_PROP,
 848                                                              &objectclass->schemaIDGUID, req);
 849                         if (ret != LDB_SUCCESS) {
 850                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
 851                                                        "acl: ACL check failed on crossRef object %s: %s\n",
 852                                                        ldb_dn_get_linearized(partition_res->msgs[0]->dn),
 853                                                        ldb_errstring(ldb));
 854                                 return ret;
 855                         }
 856
 857                         /*
 858                          * TODO: Remaining checks, like if we are
 859                          * the naming master etc need to be handled
 860                          * in the instanceType module
 861                          */
 862                         return ldb_next_request(module, req);
 863                 }
 864
 865                 /* Check that we can create a crossRef object MS-ADTS 3.1.1.5.2.8.2 */
 866                 ret = dsdb_module_check_access_on_dn(module, req, partitions_dn,
 867                                                      SEC_ADS_CREATE_CHILD,
 868                                                      &objectclass->schemaIDGUID, req);
 869                 if (ret == LDB_ERR_NO_SUCH_OBJECT &&
 870                     ldb_request_get_control(req, LDB_CONTROL_RELAX_OID))
 871                 {
 872                         /* Allow provision bootstrap */
 873                         ret = LDB_SUCCESS;
 874                 }
 875                 if (ret != LDB_SUCCESS) {
 876                         ldb_asprintf_errstring(ldb_module_get_ctx(module),
 877                                                "acl: ACL check failed on CN=Partitions crossRef container %s: %s\n",
 878                                                ldb_dn_get_linearized(partitions_dn), ldb_errstring(ldb));
 879                         return ret;
 880                 }
 881
 882                 /*
 883                  * TODO: Remaining checks, like if we are the naming
 884                  * master and adding the crossRef object need to be
 885                  * handled in the instanceType module
 886                  */
 887                 return ldb_next_request(module, req);
 888         }
 889
 890         ret = dsdb_module_check_access_on_dn(module, req, parent,
 891                                              SEC_ADS_CREATE_CHILD,
 892                                              &objectclass->schemaIDGUID, req);
 893         if (ret != LDB_SUCCESS) {
 894                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
 895                                        "acl: unable to get access to %s\n",
 896                                        ldb_dn_get_linearized(req->op.add.message->dn));
 897                 return ret;
 898         }
 899         return ldb_next_request(module, req);
 900 }
 901
 902 /* ckecks if modifications are allowed on "Member" attribute */
 903 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
 904                                      struct ldb_module *module,
 905                                      struct ldb_request *req,
 906                                      struct security_descriptor *sd,
 907                                      struct dom_sid *sid,
 908                                      const struct dsdb_attribute *attr,
 909                                      const struct dsdb_class *objectclass)
 910 {
 911         int ret;
 912         unsigned int i;
 913         struct ldb_context *ldb = ldb_module_get_ctx(module);
 914         struct ldb_dn *user_dn;
 915         struct ldb_message_element *member_el;
 916         /* if we have wp, we can do whatever we like */
 917         if (acl_check_access_on_attribute(module,
 918                                           mem_ctx,
 919                                           sd,
 920                                           sid,
 921                                           SEC_ADS_WRITE_PROP,
 922                                           attr, objectclass) == LDB_SUCCESS) {
 923                 return LDB_SUCCESS;
 924         }
 925         /* if we are adding/deleting ourselves, check for self membership */
 926         ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
 927                                   &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
 928                                   &user_dn);
 929         if (ret != LDB_SUCCESS) {
 930                 return ret;
 931         }
 932         member_el = ldb_msg_find_element(req->op.mod.message, "member");
 933         if (!member_el) {
 934                 return ldb_operr(ldb);
 935         }
 936         /* user can only remove oneself */
 937         if (member_el->num_values == 0) {
 938                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 939         }
 940         for (i = 0; i < member_el->num_values; i++) {
 941                 if (strcasecmp((const char *)member_el->values[i].data,
 942                                ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
 943                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 944                 }
 945         }
 946         ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
 947                                        GUID_DRS_SELF_MEMBERSHIP,
 948                                        SEC_ADS_SELF_WRITE,
 949                                        sid);
 950         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 951                 dsdb_acl_debug(sd, acl_user_token(module),
 952                                req->op.mod.message->dn,
 953                                true,
 954                                10);
 955         }
 956         return ret;
 957 }
 958
 959 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
 960                                      struct ldb_module *module,
 961                                      struct ldb_request *req,
 962                                      struct security_descriptor *sd,
 963                                      struct dom_sid *sid,
 964                                      const struct dsdb_class *objectclass,
 965                                      bool userPassword)
 966 {
 967         int ret = LDB_SUCCESS;
 968         unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
 969         unsigned int del_val_cnt = 0, add_val_cnt = 0, rep_val_cnt = 0;
 970         struct ldb_message_element *el;
 971         struct ldb_message *msg;
 972         struct ldb_control *c = NULL;
 973         const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
 974                                         "unicodePwd", NULL }, **l;
 975         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 976         struct dsdb_control_password_acl_validation *pav = NULL;
 977
 978         if (tmp_ctx == NULL) {
 979                 return LDB_ERR_OPERATIONS_ERROR;
 980         }
 981
 982         pav = talloc_zero(req, struct dsdb_control_password_acl_validation);
 983         if (pav == NULL) {
 984                 talloc_free(tmp_ctx);
 985                 return LDB_ERR_OPERATIONS_ERROR;
 986         }
 987
 988         c = ldb_request_get_control(req, DSDB_CONTROL_PASSWORD_CHANGE_OID);
 989         if (c != NULL) {
 990                 pav->pwd_reset = false;
 991
 992                 /*
 993                  * The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
 994                  * have a user password change and not a set as the message
 995                  * looks like. In it's value blob it contains the NT and/or LM
 996                  * hash of the old password specified by the user.  This control
 997                  * is used by the SAMR and "kpasswd" password change mechanisms.
 998                  *
 999                  * This control can't be used by real LDAP clients,
1000                  * the only caller is samdb_set_password_internal(),
1001                  * so we don't have to strict verification of the input.
1002                  */
1003                 ret = acl_check_extended_right(tmp_ctx,
1004                                                sd,
1005                                                acl_user_token(module),
1006                                                GUID_DRS_USER_CHANGE_PASSWORD,
1007                                                SEC_ADS_CONTROL_ACCESS,
1008                                                sid);
1009                 goto checked;
1010         }
1011
1012         c = ldb_request_get_control(req, DSDB_CONTROL_PASSWORD_HASH_VALUES_OID);
1013         if (c != NULL) {
1014                 pav->pwd_reset = true;
1015
1016                 /*
1017                  * The "DSDB_CONTROL_PASSWORD_HASH_VALUES_OID" control, without
1018                  * "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
1019                  * have a force password set.
1020                  * This control is used by the SAMR/NETLOGON/LSA password
1021                  * reset mechanisms.
1022                  *
1023                  * This control can't be used by real LDAP clients,
1024                  * the only caller is samdb_set_password_internal(),
1025                  * so we don't have to strict verification of the input.
1026                  */
1027                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
1028                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
1029                                                SEC_ADS_CONTROL_ACCESS,
1030                                                sid);
1031                 goto checked;
1032         }
1033
1034         el = ldb_msg_find_element(req->op.mod.message, "dBCSPwd");
1035         if (el != NULL) {
1036                 /*
1037                  * dBCSPwd is only allowed with a control.
1038                  */
1039                 talloc_free(tmp_ctx);
1040                 return LDB_ERR_UNWILLING_TO_PERFORM;
1041         }
1042
1043         msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
1044         if (msg == NULL) {
1045                 return ldb_module_oom(module);
1046         }
1047         for (l = passwordAttrs; *l != NULL; l++) {
1048                 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
1049                         continue;
1050                 }
1051
1052                 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
1053                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
1054                                 ++del_attr_cnt;
1055                                 del_val_cnt += el->num_values;
1056                         }
1057                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
1058                                 ++add_attr_cnt;
1059                                 add_val_cnt += el->num_values;
1060                         }
1061                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
1062                                 ++rep_attr_cnt;
1063                                 rep_val_cnt += el->num_values;
1064                         }
1065                         ldb_msg_remove_element(msg, el);
1066                 }
1067         }
1068
1069         /* single deletes will be handled by the "password_hash" LDB module
1070          * later in the stack, so we let it though here */
1071         if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
1072                 talloc_free(tmp_ctx);
1073                 return LDB_SUCCESS;
1074         }
1075
1076
1077         if (rep_attr_cnt > 0) {
1078                 pav->pwd_reset = true;
1079
1080                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
1081                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
1082                                                SEC_ADS_CONTROL_ACCESS,
1083                                                sid);
1084                 goto checked;
1085         }
1086
1087         if (add_attr_cnt != del_attr_cnt) {
1088                 pav->pwd_reset = true;
1089
1090                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
1091                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
1092                                                SEC_ADS_CONTROL_ACCESS,
1093                                                sid);
1094                 goto checked;
1095         }
1096
1097         if (add_val_cnt == 1 && del_val_cnt == 1) {
1098                 pav->pwd_reset = false;
1099
1100                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
1101                                                GUID_DRS_USER_CHANGE_PASSWORD,
1102                                                SEC_ADS_CONTROL_ACCESS,
1103                                                sid);
1104                 /* Very strange, but we get constraint violation in this case */
1105                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
1106                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
1107                 }
1108                 goto checked;
1109         }
1110
1111         if (add_val_cnt == 1 && del_val_cnt == 0) {
1112                 pav->pwd_reset = true;
1113
1114                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
1115                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
1116                                                SEC_ADS_CONTROL_ACCESS,
1117                                                sid);
1118                 /* Very strange, but we get constraint violation in this case */
1119                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
1120                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
1121                 }
1122                 goto checked;
1123         }
1124
1125         /*
1126          * Everything else is handled by the password_hash module where it will
1127          * fail, but with the correct error code when the module is again
1128          * checking the attributes. As the change request will lack the
1129          * DSDB_CONTROL_PASSWORD_ACL_VALIDATION_OID control, we can be sure that
1130          * any modification attempt that went this way will be rejected.
1131          */
1132
1133         talloc_free(tmp_ctx);
1134         return LDB_SUCCESS;
1135
1136 checked:
1137         if (ret != LDB_SUCCESS) {
1138                 dsdb_acl_debug(sd, acl_user_token(module),
1139                                req->op.mod.message->dn,
1140                                true,
1141                                10);
1142                 talloc_free(tmp_ctx);
1143                 return ret;
1144         }
1145
1146         ret = ldb_request_add_control(req,
1147                 DSDB_CONTROL_PASSWORD_ACL_VALIDATION_OID, false, pav);
1148         if (ret != LDB_SUCCESS) {
1149                 ldb_debug(ldb_module_get_ctx(module), LDB_DEBUG_ERROR,
1150                           "Unable to register ACL validation control!\n");
1151                 return ret;
1152         }
1153         return LDB_SUCCESS;
1154 }
1155
1156 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
1157 {
1158         int ret;
1159         struct ldb_context *ldb = ldb_module_get_ctx(module);
1160         const struct dsdb_schema *schema;
1161         unsigned int i;
1162         const struct dsdb_class *objectclass;
1163         struct ldb_result *acl_res;
1164         struct security_descriptor *sd;
1165         struct dom_sid *sid = NULL;
1166         struct ldb_control *as_system;
1167         struct ldb_control *is_undelete;
1168         bool userPassword;
1169         bool password_rights_checked = false;
1170         TALLOC_CTX *tmp_ctx;
1171         const struct ldb_message *msg = req->op.mod.message;
1172         static const char *acl_attrs[] = {
1173                 "nTSecurityDescriptor",
1174                 "objectClass",
1175                 "objectSid",
1176                 NULL
1177         };
1178
1179         if (ldb_dn_is_special(msg->dn)) {
1180                 return ldb_next_request(module, req);
1181         }
1182
1183         as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1184         if (as_system != NULL) {
1185                 as_system->critical = 0;
1186         }
1187
1188         is_undelete = ldb_request_get_control(req, DSDB_CONTROL_RESTORE_TOMBSTONE_OID);
1189
1190         /* Don't print this debug statement if elements[0].name is going to be NULL */
1191         if (msg->num_elements > 0) {
1192                 DEBUG(10, ("ldb:acl_modify: %s\n", msg->elements[0].name));
1193         }
1194         if (dsdb_module_am_system(module) || as_system) {
1195                 return ldb_next_request(module, req);
1196         }
1197
1198         tmp_ctx = talloc_new(req);
1199         if (tmp_ctx == NULL) {
1200                 return ldb_oom(ldb);
1201         }
1202
1203         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, msg->dn,
1204                                     acl_attrs,
1205                                     DSDB_FLAG_NEXT_MODULE |
1206                                     DSDB_FLAG_AS_SYSTEM |
1207                                     DSDB_SEARCH_SHOW_RECYCLED,
1208                                     req);
1209
1210         if (ret != LDB_SUCCESS) {
1211                 goto fail;
1212         }
1213
1214         userPassword = dsdb_user_password_support(module, req, req);
1215
1216         schema = dsdb_get_schema(ldb, tmp_ctx);
1217         if (!schema) {
1218                 talloc_free(tmp_ctx);
1219                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1220                                  "acl_modify: Error obtaining schema.");
1221         }
1222
1223         ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
1224         if (ret != LDB_SUCCESS) {
1225                 talloc_free(tmp_ctx);
1226                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1227                                  "acl_modify: Error retrieving security descriptor.");
1228         }
1229         /* Theoretically we pass the check if the object has no sd */
1230         if (!sd) {
1231                 goto success;
1232         }
1233
1234         objectclass = dsdb_get_structural_oc_from_msg(schema, acl_res->msgs[0]);
1235         if (!objectclass) {
1236                 talloc_free(tmp_ctx);
1237                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1238                                  "acl_modify: Error retrieving object class for GUID.");
1239         }
1240         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1241         for (i=0; i < msg->num_elements; i++) {
1242                 const struct ldb_message_element *el = &msg->elements[i];
1243                 const struct dsdb_attribute *attr;
1244
1245                 /*
1246                  * This basic attribute existence check with the right errorcode
1247                  * is needed since this module is the first one which requests
1248                  * schema attribute information.
1249                  * The complete attribute checking is done in the
1250                  * "objectclass_attrs" module behind this one.
1251                  *
1252                  * NOTE: "clearTextPassword" is not defined in the schema.
1253                  */
1254                 attr = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1255                 if (!attr && ldb_attr_cmp("clearTextPassword", el->name) != 0) {
1256                         ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' "
1257                                                "on entry '%s' was not found in the schema!",
1258                                                req->op.mod.message->elements[i].name,
1259                                        ldb_dn_get_linearized(req->op.mod.message->dn));
1260                         ret =  LDB_ERR_NO_SUCH_ATTRIBUTE;
1261                         goto fail;
1262                 }
1263
1264                 if (ldb_attr_cmp("nTSecurityDescriptor", el->name) == 0) {
1265                         uint32_t sd_flags = dsdb_request_sd_flags(req, NULL);
1266                         uint32_t access_mask = 0;
1267
1268                         if (sd_flags & (SECINFO_OWNER|SECINFO_GROUP)) {
1269                                 access_mask |= SEC_STD_WRITE_OWNER;
1270                         }
1271                         if (sd_flags & SECINFO_DACL) {
1272                                 access_mask |= SEC_STD_WRITE_DAC;
1273                         }
1274                         if (sd_flags & SECINFO_SACL) {
1275                                 access_mask |= SEC_FLAG_SYSTEM_SECURITY;
1276                         }
1277
1278                         ret = acl_check_access_on_attribute(module,
1279                                                             tmp_ctx,
1280                                                             sd,
1281                                                             sid,
1282                                                             access_mask,
1283                                                             attr,
1284                                                             objectclass);
1285                         if (ret != LDB_SUCCESS) {
1286                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1287                                                        "Object %s has no write dacl access\n",
1288                                                        ldb_dn_get_linearized(msg->dn));
1289                                 dsdb_acl_debug(sd,
1290                                                acl_user_token(module),
1291                                                msg->dn,
1292                                                true,
1293                                                10);
1294                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1295                                 goto fail;
1296                         }
1297                 } else if (ldb_attr_cmp("member", el->name) == 0) {
1298                         ret = acl_check_self_membership(tmp_ctx,
1299                                                         module,
1300                                                         req,
1301                                                         sd,
1302                                                         sid,
1303                                                         attr,
1304                                                         objectclass);
1305                         if (ret != LDB_SUCCESS) {
1306                                 goto fail;
1307                         }
1308                 } else if (ldb_attr_cmp("dBCSPwd", el->name) == 0) {
1309                         /* this one is not affected by any rights, we should let it through
1310                            so that passwords_hash returns the correct error */
1311                         continue;
1312                 } else if (ldb_attr_cmp("unicodePwd", el->name) == 0 ||
1313                            (userPassword && ldb_attr_cmp("userPassword", el->name) == 0) ||
1314                            ldb_attr_cmp("clearTextPassword", el->name) == 0) {
1315                         if (password_rights_checked) {
1316                                 continue;
1317                         }
1318                         ret = acl_check_password_rights(tmp_ctx,
1319                                                         module,
1320                                                         req,
1321                                                         sd,
1322                                                         sid,
1323                                                         objectclass,
1324                                                         userPassword);
1325                         if (ret != LDB_SUCCESS) {
1326                                 goto fail;
1327                         }
1328                         password_rights_checked = true;
1329                 } else if (ldb_attr_cmp("servicePrincipalName", el->name) == 0) {
1330                         ret = acl_check_spn(tmp_ctx,
1331                                             module,
1332                                             req,
1333                                             sd,
1334                                             sid,
1335                                             attr,
1336                                             objectclass);
1337                         if (ret != LDB_SUCCESS) {
1338                                 goto fail;
1339                         }
1340                 } else if (is_undelete != NULL && (ldb_attr_cmp("isDeleted", el->name) == 0)) {
1341                         /*
1342                          * in case of undelete op permissions on
1343                          * isDeleted are irrelevant and
1344                          * distinguishedName is removed by the
1345                          * tombstone_reanimate module
1346                          */
1347                         continue;
1348                 } else {
1349                         ret = acl_check_access_on_attribute(module,
1350                                                             tmp_ctx,
1351                                                             sd,
1352                                                             sid,
1353                                                             SEC_ADS_WRITE_PROP,
1354                                                             attr,
1355                                                             objectclass);
1356                         if (ret != LDB_SUCCESS) {
1357                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1358                                                        "Object %s has no write property access\n",
1359                                                        ldb_dn_get_linearized(msg->dn));
1360                                 dsdb_acl_debug(sd,
1361                                                acl_user_token(module),
1362                                                msg->dn,
1363                                                true,
1364                                                10);
1365                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1366                                 goto fail;
1367                         }
1368                 }
1369         }
1370
1371 success:
1372         talloc_free(tmp_ctx);
1373         return ldb_next_request(module, req);
1374 fail:
1375         talloc_free(tmp_ctx);
1376         return ret;
1377 }
1378
1379 /* similar to the modify for the time being.
1380  * We need to consider the special delete tree case, though - TODO */
1381 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1382 {
1383         int ret;
1384         struct ldb_dn *parent;
1385         struct ldb_context *ldb;
1386         struct ldb_dn *nc_root;
1387         struct ldb_control *as_system;
1388         const struct dsdb_schema *schema;
1389         const struct dsdb_class *objectclass;
1390         struct security_descriptor *sd = NULL;
1391         struct dom_sid *sid = NULL;
1392         struct ldb_result *acl_res;
1393         static const char *acl_attrs[] = {
1394                 "nTSecurityDescriptor",
1395                 "objectClass",
1396                 "objectSid",
1397                 NULL
1398         };
1399
1400         if (ldb_dn_is_special(req->op.del.dn)) {
1401                 return ldb_next_request(module, req);
1402         }
1403
1404         as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1405         if (as_system != NULL) {
1406                 as_system->critical = 0;
1407         }
1408
1409         if (dsdb_module_am_system(module) || as_system) {
1410                 return ldb_next_request(module, req);
1411         }
1412
1413         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1414
1415         ldb = ldb_module_get_ctx(module);
1416
1417         parent = ldb_dn_get_parent(req, req->op.del.dn);
1418         if (parent == NULL) {
1419                 return ldb_oom(ldb);
1420         }
1421
1422         /* Make sure we aren't deleting a NC */
1423
1424         ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1425         if (ret != LDB_SUCCESS) {
1426                 return ret;
1427         }
1428         if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1429                 talloc_free(nc_root);
1430                 DEBUG(10,("acl:deleting a NC\n"));
1431                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1432                 return ldb_module_done(req, NULL, NULL,
1433                                        LDB_ERR_UNWILLING_TO_PERFORM);
1434         }
1435         talloc_free(nc_root);
1436
1437         ret = dsdb_module_search_dn(module, req, &acl_res,
1438                                     req->op.del.dn, acl_attrs,
1439                                     DSDB_FLAG_NEXT_MODULE |
1440                                     DSDB_FLAG_AS_SYSTEM |
1441                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1442         /* we sould be able to find the parent */
1443         if (ret != LDB_SUCCESS) {
1444                 DEBUG(10,("acl: failed to find object %s\n",
1445                           ldb_dn_get_linearized(req->op.rename.olddn)));
1446                 return ret;
1447         }
1448
1449         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1450         if (ret != LDB_SUCCESS) {
1451                 return ldb_operr(ldb);
1452         }
1453         if (!sd) {
1454                 return ldb_operr(ldb);
1455         }
1456
1457         schema = dsdb_get_schema(ldb, req);
1458         if (!schema) {
1459                 return ldb_operr(ldb);
1460         }
1461
1462         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1463
1464         objectclass = dsdb_get_structural_oc_from_msg(schema, acl_res->msgs[0]);
1465         if (!objectclass) {
1466                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1467                                  "acl_modify: Error retrieving object class for GUID.");
1468         }
1469
1470         if (ldb_request_get_control(req, LDB_CONTROL_TREE_DELETE_OID)) {
1471                 ret = acl_check_access_on_objectclass(module, req, sd, sid,
1472                                                       SEC_ADS_DELETE_TREE,
1473                                                       objectclass);
1474                 if (ret != LDB_SUCCESS) {
1475                         return ret;
1476                 }
1477
1478                 return ldb_next_request(module, req);
1479         }
1480
1481         /* First check if we have delete object right */
1482         ret = acl_check_access_on_objectclass(module, req, sd, sid,
1483                                               SEC_STD_DELETE,
1484                                               objectclass);
1485         if (ret == LDB_SUCCESS) {
1486                 return ldb_next_request(module, req);
1487         }
1488
1489         /* Nope, we don't have delete object. Lets check if we have delete
1490          * child on the parent */
1491         ret = dsdb_module_check_access_on_dn(module, req, parent,
1492                                              SEC_ADS_DELETE_CHILD,
1493                                              &objectclass->schemaIDGUID,
1494                                              req);
1495         if (ret != LDB_SUCCESS) {
1496                 return ret;
1497         }
1498
1499         return ldb_next_request(module, req);
1500 }
1501 static int acl_check_reanimate_tombstone(TALLOC_CTX *mem_ctx,
1502                                          struct ldb_module *module,
1503                                          struct ldb_request *req,
1504                                          struct ldb_dn *nc_root)
1505 {
1506         int ret;
1507         struct ldb_result *acl_res;
1508         struct security_descriptor *sd = NULL;
1509         struct dom_sid *sid = NULL;
1510         static const char *acl_attrs[] = {
1511                 "nTSecurityDescriptor",
1512                 "objectClass",
1513                 "objectSid",
1514                 NULL
1515         };
1516
1517         ret = dsdb_module_search_dn(module, mem_ctx, &acl_res,
1518                                     nc_root, acl_attrs,
1519                                     DSDB_FLAG_NEXT_MODULE |
1520                                     DSDB_FLAG_AS_SYSTEM |
1521                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1522         if (ret != LDB_SUCCESS) {
1523                 DEBUG(10,("acl: failed to find object %s\n",
1524                           ldb_dn_get_linearized(nc_root)));
1525                 return ret;
1526         }
1527
1528         ret = dsdb_get_sd_from_ldb_message(mem_ctx, req, acl_res->msgs[0], &sd);
1529         sid = samdb_result_dom_sid(mem_ctx, acl_res->msgs[0], "objectSid");
1530         if (ret != LDB_SUCCESS || !sd) {
1531                 return ldb_operr(ldb_module_get_ctx(module));
1532         }
1533         return acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
1534                                         GUID_DRS_REANIMATE_TOMBSTONE,
1535                                         SEC_ADS_CONTROL_ACCESS, sid);
1536 }
1537
1538 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1539 {
1540         int ret;
1541         struct ldb_dn *oldparent;
1542         struct ldb_dn *newparent;
1543         const struct dsdb_schema *schema;
1544         const struct dsdb_class *objectclass;
1545         const struct dsdb_attribute *attr = NULL;
1546         struct ldb_context *ldb;
1547         struct security_descriptor *sd = NULL;
1548         struct dom_sid *sid = NULL;
1549         struct ldb_result *acl_res;
1550         struct ldb_dn *nc_root;
1551         struct ldb_control *as_system;
1552         struct ldb_control *is_undelete;
1553         TALLOC_CTX *tmp_ctx;
1554         const char *rdn_name;
1555         static const char *acl_attrs[] = {
1556                 "nTSecurityDescriptor",
1557                 "objectClass",
1558                 "objectSid",
1559                 NULL
1560         };
1561
1562         if (ldb_dn_is_special(req->op.rename.olddn)) {
1563                 return ldb_next_request(module, req);
1564         }
1565
1566         as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1567         if (as_system != NULL) {
1568                 as_system->critical = 0;
1569         }
1570
1571         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1572         if (dsdb_module_am_system(module) || as_system) {
1573                 return ldb_next_request(module, req);
1574         }
1575
1576         ldb = ldb_module_get_ctx(module);
1577
1578         tmp_ctx = talloc_new(req);
1579         if (tmp_ctx == NULL) {
1580                 return ldb_oom(ldb);
1581         }
1582
1583         oldparent = ldb_dn_get_parent(tmp_ctx, req->op.rename.olddn);
1584         if (oldparent == NULL) {
1585                 return ldb_oom(ldb);
1586         }
1587         newparent = ldb_dn_get_parent(tmp_ctx, req->op.rename.newdn);
1588         if (newparent == NULL) {
1589                 return ldb_oom(ldb);
1590         }
1591
1592         /* Make sure we aren't renaming/moving a NC */
1593
1594         ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1595         if (ret != LDB_SUCCESS) {
1596                 return ret;
1597         }
1598         if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1599                 talloc_free(nc_root);
1600                 DEBUG(10,("acl:renaming/moving a NC\n"));
1601                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1602                 return ldb_module_done(req, NULL, NULL,
1603                                        LDB_ERR_UNWILLING_TO_PERFORM);
1604         }
1605
1606         /* special check for undelete operation */
1607         is_undelete = ldb_request_get_control(req, DSDB_CONTROL_RESTORE_TOMBSTONE_OID);
1608         if (is_undelete != NULL) {
1609                 is_undelete->critical = 0;
1610                 ret = acl_check_reanimate_tombstone(tmp_ctx, module, req, nc_root);
1611                 if (ret != LDB_SUCCESS) {
1612                         talloc_free(tmp_ctx);
1613                         return ret;
1614                 }
1615         }
1616         talloc_free(nc_root);
1617
1618         /* Look for the parent */
1619
1620         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1621                                     req->op.rename.olddn, acl_attrs,
1622                                     DSDB_FLAG_NEXT_MODULE |
1623                                     DSDB_FLAG_AS_SYSTEM |
1624                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1625         /* we sould be able to find the parent */
1626         if (ret != LDB_SUCCESS) {
1627                 DEBUG(10,("acl: failed to find object %s\n",
1628                           ldb_dn_get_linearized(req->op.rename.olddn)));
1629                 talloc_free(tmp_ctx);
1630                 return ret;
1631         }
1632
1633         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1634         if (ret != LDB_SUCCESS) {
1635                 talloc_free(tmp_ctx);
1636                 return ldb_operr(ldb);
1637         }
1638         if (!sd) {
1639                 talloc_free(tmp_ctx);
1640                 return ldb_operr(ldb);
1641         }
1642
1643         schema = dsdb_get_schema(ldb, acl_res);
1644         if (!schema) {
1645                 talloc_free(tmp_ctx);
1646                 return ldb_operr(ldb);
1647         }
1648
1649         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1650
1651         objectclass = dsdb_get_structural_oc_from_msg(schema, acl_res->msgs[0]);
1652         if (!objectclass) {
1653                 talloc_free(tmp_ctx);
1654                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1655                                  "acl_modify: Error retrieving object class for GUID.");
1656         }
1657
1658         attr = dsdb_attribute_by_lDAPDisplayName(schema, "name");
1659         if (attr == NULL) {
1660                 talloc_free(tmp_ctx);
1661                 return ldb_operr(ldb);
1662         }
1663
1664         ret = acl_check_access_on_attribute(module, tmp_ctx, sd, sid,
1665                                             SEC_ADS_WRITE_PROP,
1666                                             attr, objectclass);
1667         if (ret != LDB_SUCCESS) {
1668                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1669                                        "Object %s has no wp on %s\n",
1670                                        ldb_dn_get_linearized(req->op.rename.olddn),
1671                                        attr->lDAPDisplayName);
1672                 dsdb_acl_debug(sd,
1673                           acl_user_token(module),
1674                           req->op.rename.olddn,
1675                           true,
1676                           10);
1677                 talloc_free(tmp_ctx);
1678                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1679         }
1680
1681         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1682         if (rdn_name == NULL) {
1683                 talloc_free(tmp_ctx);
1684                 return ldb_operr(ldb);
1685         }
1686
1687         attr = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
1688         if (attr == NULL) {
1689                 talloc_free(tmp_ctx);
1690                 return ldb_operr(ldb);
1691         }
1692
1693         ret = acl_check_access_on_attribute(module, tmp_ctx, sd, sid,
1694                                             SEC_ADS_WRITE_PROP,
1695                                             attr, objectclass);
1696         if (ret != LDB_SUCCESS) {
1697                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1698                                        "Object %s has no wp on %s\n",
1699                                        ldb_dn_get_linearized(req->op.rename.olddn),
1700                                        attr->lDAPDisplayName);
1701                 dsdb_acl_debug(sd,
1702                           acl_user_token(module),
1703                           req->op.rename.olddn,
1704                           true,
1705                           10);
1706                 talloc_free(tmp_ctx);
1707                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1708         }
1709
1710         if (ldb_dn_compare(oldparent, newparent) == 0) {
1711                 /* regular rename, not move, nothing more to do */
1712                 talloc_free(tmp_ctx);
1713                 return ldb_next_request(module, req);
1714         }
1715
1716         /* new parent should have create child */
1717         ret = dsdb_module_check_access_on_dn(module, req, newparent,
1718                                              SEC_ADS_CREATE_CHILD,
1719                                              &objectclass->schemaIDGUID, req);
1720         if (ret != LDB_SUCCESS) {
1721                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1722                                        "acl:access_denied renaming %s",
1723                                        ldb_dn_get_linearized(req->op.rename.olddn));
1724                 talloc_free(tmp_ctx);
1725                 return ret;
1726         }
1727
1728         /* do we have delete object on the object? */
1729         /* this access is not necessary for undelete ops */
1730         if (is_undelete == NULL) {
1731                 ret = acl_check_access_on_objectclass(module, tmp_ctx, sd, sid,
1732                                                       SEC_STD_DELETE,
1733                                                       objectclass);
1734                 if (ret == LDB_SUCCESS) {
1735                         talloc_free(tmp_ctx);
1736                         return ldb_next_request(module, req);
1737                 }
1738                 /* what about delete child on the current parent */
1739                 ret = dsdb_module_check_access_on_dn(module, req, oldparent,
1740                                                      SEC_ADS_DELETE_CHILD,
1741                                                      &objectclass->schemaIDGUID,
1742                                                      req);
1743                 if (ret != LDB_SUCCESS) {
1744                         ldb_asprintf_errstring(ldb_module_get_ctx(module),
1745                                                "acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn));
1746                         talloc_free(tmp_ctx);
1747                         return ldb_module_done(req, NULL, NULL, ret);
1748                 }
1749         }
1750         talloc_free(tmp_ctx);
1751
1752         return ldb_next_request(module, req);
1753 }
1754
1755 static int acl_search_update_confidential_attrs(struct acl_context *ac,
1756                                                 struct acl_private *data)
1757 {
1758         struct dsdb_attribute *a;
1759         uint32_t n = 0;
1760
1761         if (data->acl_search) {
1762                 /*
1763                  * If acl:search is activated, the acl_read module
1764                  * protects confidential attributes.
1765                  */
1766                 return LDB_SUCCESS;
1767         }
1768
1769         if ((ac->schema == data->cached_schema_ptr) &&
1770             (ac->schema->metadata_usn == data->cached_schema_metadata_usn))
1771         {
1772                 return LDB_SUCCESS;
1773         }
1774
1775         data->cached_schema_ptr = NULL;
1776         data->cached_schema_loaded_usn = 0;
1777         data->cached_schema_metadata_usn = 0;
1778         TALLOC_FREE(data->confidential_attrs);
1779
1780         if (ac->schema == NULL) {
1781                 return LDB_SUCCESS;
1782         }
1783
1784         for (a = ac->schema->attributes; a; a = a->next) {
1785                 const char **attrs = data->confidential_attrs;
1786
1787                 if (!(a->searchFlags & SEARCH_FLAG_CONFIDENTIAL)) {
1788                         continue;
1789                 }
1790
1791                 attrs = talloc_realloc(data, attrs, const char *, n + 2);
1792                 if (attrs == NULL) {
1793                         TALLOC_FREE(data->confidential_attrs);
1794                         return ldb_module_oom(ac->module);
1795                 }
1796
1797                 attrs[n] = a->lDAPDisplayName;
1798                 attrs[n+1] = NULL;
1799                 n++;
1800
1801                 data->confidential_attrs = attrs;
1802         }
1803
1804         data->cached_schema_ptr = ac->schema;
1805         data->cached_schema_metadata_usn = ac->schema->metadata_usn;
1806
1807         return LDB_SUCCESS;
1808 }
1809
1810 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1811 {
1812         struct acl_context *ac;
1813         struct acl_private *data;
1814         struct ldb_result *acl_res;
1815         static const char *acl_attrs[] = {
1816                 "objectClass",
1817                 "nTSecurityDescriptor",
1818                 "objectSid",
1819                 NULL
1820         };
1821         int ret;
1822         unsigned int i;
1823
1824         ac = talloc_get_type(req->context, struct acl_context);
1825         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1826         if (!ares) {
1827                 return ldb_module_done(ac->req, NULL, NULL,
1828                                        LDB_ERR_OPERATIONS_ERROR);
1829         }
1830         if (ares->error != LDB_SUCCESS) {
1831                 return ldb_module_done(ac->req, ares->controls,
1832                                        ares->response, ares->error);
1833         }
1834
1835         switch (ares->type) {
1836         case LDB_REPLY_ENTRY:
1837                 if (ac->constructed_attrs) {
1838                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1839                                                     acl_attrs,
1840                                                     DSDB_FLAG_NEXT_MODULE |
1841                                                     DSDB_FLAG_AS_SYSTEM |
1842                                                     DSDB_SEARCH_SHOW_RECYCLED,
1843                                                     req);
1844                         if (ret != LDB_SUCCESS) {
1845                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1846                         }
1847                 }
1848
1849                 if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1850                         ret = acl_allowedAttributes(ac->module, ac->schema,
1851                                                     acl_res->msgs[0],
1852                                                     ares->message, ac);
1853                         if (ret != LDB_SUCCESS) {
1854                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1855                         }
1856                 }
1857
1858                 if (ac->allowedChildClasses) {
1859                         ret = acl_childClasses(ac->module, ac->schema,
1860                                                acl_res->msgs[0],
1861                                                ares->message,
1862                                                "allowedChildClasses");
1863                         if (ret != LDB_SUCCESS) {
1864                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1865                         }
1866                 }
1867
1868                 if (ac->allowedChildClassesEffective) {
1869                         ret = acl_childClassesEffective(ac->module, ac->schema,
1870                                                         acl_res->msgs[0],
1871                                                         ares->message, ac);
1872                         if (ret != LDB_SUCCESS) {
1873                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1874                         }
1875                 }
1876
1877                 if (ac->sDRightsEffective) {
1878                         ret = acl_sDRightsEffective(ac->module,
1879                                                     acl_res->msgs[0],
1880                                                     ares->message, ac);
1881                         if (ret != LDB_SUCCESS) {
1882                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1883                         }
1884                 }
1885
1886                 if (data == NULL) {
1887                         return ldb_module_send_entry(ac->req, ares->message,
1888                                                      ares->controls);
1889                 }
1890
1891                 if (ac->am_system) {
1892                         return ldb_module_send_entry(ac->req, ares->message,
1893                                                      ares->controls);
1894                 }
1895
1896                 if (data->password_attrs != NULL) {
1897                         for (i = 0; data->password_attrs[i]; i++) {
1898                                 if ((!ac->userPassword) &&
1899                                     (ldb_attr_cmp(data->password_attrs[i],
1900                                                   "userPassword") == 0))
1901                                 {
1902                                                 continue;
1903                                 }
1904
1905                                 ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1906                         }
1907                 }
1908
1909                 if (ac->am_administrator) {
1910                         return ldb_module_send_entry(ac->req, ares->message,
1911                                                      ares->controls);
1912                 }
1913
1914                 ret = acl_search_update_confidential_attrs(ac, data);
1915                 if (ret != LDB_SUCCESS) {
1916                         return ret;
1917                 }
1918
1919                 if (data->confidential_attrs != NULL) {
1920                         for (i = 0; data->confidential_attrs[i]; i++) {
1921                                 ldb_msg_remove_attr(ares->message,
1922                                                     data->confidential_attrs[i]);
1923                         }
1924                 }
1925
1926                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1927
1928         case LDB_REPLY_REFERRAL:
1929                 return ldb_module_send_referral(ac->req, ares->referral);
1930
1931         case LDB_REPLY_DONE:
1932                 return ldb_module_done(ac->req, ares->controls,
1933                                        ares->response, LDB_SUCCESS);
1934
1935         }
1936         return LDB_SUCCESS;
1937 }
1938
1939 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1940 {
1941         struct ldb_context *ldb;
1942         struct acl_context *ac;
1943         struct ldb_parse_tree *down_tree;
1944         struct ldb_request *down_req;
1945         struct acl_private *data;
1946         int ret;
1947         unsigned int i;
1948
1949         if (ldb_dn_is_special(req->op.search.base)) {
1950                 return ldb_next_request(module, req);
1951         }
1952
1953         ldb = ldb_module_get_ctx(module);
1954
1955         ac = talloc_zero(req, struct acl_context);
1956         if (ac == NULL) {
1957                 return ldb_oom(ldb);
1958         }
1959         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1960
1961         ac->module = module;
1962         ac->req = req;
1963         ac->am_system = dsdb_module_am_system(module);
1964         ac->am_administrator = dsdb_module_am_administrator(module);
1965         ac->constructed_attrs = false;
1966         ac->modify_search = true;
1967         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1968         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1969         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1970         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1971         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1972         ac->userPassword = true;
1973         ac->schema = dsdb_get_schema(ldb, ac);
1974
1975         ac->constructed_attrs |= ac->allowedAttributes;
1976         ac->constructed_attrs |= ac->allowedChildClasses;
1977         ac->constructed_attrs |= ac->allowedChildClassesEffective;
1978         ac->constructed_attrs |= ac->allowedAttributesEffective;
1979         ac->constructed_attrs |= ac->sDRightsEffective;
1980
1981         if (data == NULL) {
1982                 ac->modify_search = false;
1983         }
1984         if (ac->am_system) {
1985                 ac->modify_search = false;
1986         }
1987
1988         if (!ac->constructed_attrs && !ac->modify_search) {
1989                 talloc_free(ac);
1990                 return ldb_next_request(module, req);
1991         }
1992
1993         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1994         if (data != NULL) {
1995                 ac->userPassword = data->userPassword_support;
1996         }
1997
1998         ret = acl_search_update_confidential_attrs(ac, data);
1999         if (ret != LDB_SUCCESS) {
2000                 return ret;
2001         }
2002
2003         down_tree = ldb_parse_tree_copy_shallow(ac, req->op.search.tree);
2004         if (down_tree == NULL) {
2005                 return ldb_oom(ldb);
2006         }
2007
2008         if (!ac->am_system && data->password_attrs) {
2009                 for (i = 0; data->password_attrs[i]; i++) {
2010                         if ((!ac->userPassword) &&
2011                             (ldb_attr_cmp(data->password_attrs[i],
2012                                           "userPassword") == 0))
2013                         {
2014                                 continue;
2015                         }
2016
2017                         ldb_parse_tree_attr_replace(down_tree,
2018                                                     data->password_attrs[i],
2019                                                     "kludgeACLredactedattribute");
2020                 }
2021         }
2022
2023         if (!ac->am_system && !ac->am_administrator && data->confidential_attrs) {
2024                 for (i = 0; data->confidential_attrs[i]; i++) {
2025                         ldb_parse_tree_attr_replace(down_tree,
2026                                                     data->confidential_attrs[i],
2027                                                     "kludgeACLredactedattribute");
2028                 }
2029         }
2030
2031         ret = ldb_build_search_req_ex(&down_req,
2032                                       ldb, ac,
2033                                       req->op.search.base,
2034                                       req->op.search.scope,
2035                                       down_tree,
2036                                       req->op.search.attrs,
2037                                       req->controls,
2038                                       ac, acl_search_callback,
2039                                       req);
2040         LDB_REQ_SET_LOCATION(down_req);
2041         if (ret != LDB_SUCCESS) {
2042                 return ret;
2043         }
2044         /* perform the search */
2045         return ldb_next_request(module, down_req);
2046 }
2047
2048 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
2049 {
2050         struct ldb_context *ldb = ldb_module_get_ctx(module);
2051         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
2052
2053         /* allow everybody to read the sequence number */
2054         if (strcmp(req->op.extended.oid,
2055                    LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
2056                 return ldb_next_request(module, req);
2057         }
2058
2059         if (dsdb_module_am_system(module) ||
2060             dsdb_module_am_administrator(module) || as_system) {
2061                 return ldb_next_request(module, req);
2062         } else {
2063                 ldb_asprintf_errstring(ldb,
2064                                        "acl_extended: "
2065                                        "attempted database modify not permitted. "
2066                                        "User %s is not SYSTEM or an administrator",
2067                                        acl_user_name(req, module));
2068                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
2069         }
2070 }
2071
2072 static const struct ldb_module_ops ldb_acl_module_ops = {
2073         .name              = "acl",
2074         .search            = acl_search,
2075         .add               = acl_add,
2076         .modify            = acl_modify,
2077         .del               = acl_delete,
2078         .rename            = acl_rename,
2079         .extended          = acl_extended,
2080         .init_context      = acl_module_init
2081 };
2082
2083 int ldb_acl_module_init(const char *version)
2084 {
2085         LDB_MODULE_CHECK_VERSION(version);
2086         return ldb_register_module(&ldb_acl_module_ops);
2087 }