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 "dsdb/samdb/ldb_modules/schema.h"
  43 #include "lib/util/tsort.h"
  44 #include "system/kerberos.h"
  45 #include "auth/kerberos/kerberos.h"
  46
  47 struct extended_access_check_attribute {
  48         const char *oa_name;
  49         const uint32_t requires_rights;
  50 };
  51
  52 struct acl_private {
  53         bool acl_perform;
  54         const char **password_attrs;
  55 };
  56
  57 struct acl_context {
  58         struct ldb_module *module;
  59         struct ldb_request *req;
  60         bool am_system;
  61         bool allowedAttributes;
  62         bool allowedAttributesEffective;
  63         bool allowedChildClasses;
  64         bool allowedChildClassesEffective;
  65         bool sDRightsEffective;
  66         bool userPassword;
  67         const char * const *attrs;
  68         struct dsdb_schema *schema;
  69 };
  70
  71 static int acl_module_init(struct ldb_module *module)
  72 {
  73         struct ldb_context *ldb;
  74         struct acl_private *data;
  75         int ret;
  76         unsigned int i;
  77         TALLOC_CTX *mem_ctx;
  78         static const char *attrs[] = { "passwordAttribute", NULL };
  79         struct ldb_result *res;
  80         struct ldb_message *msg;
  81         struct ldb_message_element *password_attributes;
  82
  83         ldb = ldb_module_get_ctx(module);
  84
  85         ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
  86         if (ret != LDB_SUCCESS) {
  87                 ldb_debug(ldb, LDB_DEBUG_ERROR,
  88                           "acl_module_init: Unable to register control with rootdse!\n");
  89                 return ldb_operr(ldb);
  90         }
  91
  92         data = talloc(module, struct acl_private);
  93         if (data == NULL) {
  94                 return ldb_oom(ldb);
  95         }
  96
  97         data->password_attrs = NULL;
  98         data->acl_perform = lpcfg_parm_bool(ldb_get_opaque(ldb, "loadparm"),
  99                                          NULL, "acl", "perform", false);
 100         ldb_module_set_private(module, data);
 101
 102         mem_ctx = talloc_new(module);
 103         if (!mem_ctx) {
 104                 return ldb_oom(ldb);
 105         }
 106
 107         ret = dsdb_module_search_dn(module, mem_ctx, &res,
 108                                     ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
 109                                     attrs,
 110                                     DSDB_FLAG_NEXT_MODULE, NULL);
 111         if (ret != LDB_SUCCESS) {
 112                 goto done;
 113         }
 114         if (res->count == 0) {
 115                 goto done;
 116         }
 117
 118         if (res->count > 1) {
 119                 talloc_free(mem_ctx);
 120                 return LDB_ERR_CONSTRAINT_VIOLATION;
 121         }
 122
 123         msg = res->msgs[0];
 124
 125         password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
 126         if (!password_attributes) {
 127                 goto done;
 128         }
 129         data->password_attrs = talloc_array(data, const char *, password_attributes->num_values + 1);
 130         if (!data->password_attrs) {
 131                 talloc_free(mem_ctx);
 132                 return ldb_oom(ldb);
 133         }
 134         for (i=0; i < password_attributes->num_values; i++) {
 135                 data->password_attrs[i] = (const char *)password_attributes->values[i].data;
 136                 talloc_steal(data->password_attrs, password_attributes->values[i].data);
 137         }
 138         data->password_attrs[i] = NULL;
 139
 140 done:
 141         talloc_free(mem_ctx);
 142         return ldb_next_init(module);
 143 }
 144
 145 static int acl_allowedAttributes(struct ldb_module *module,
 146                                  const struct dsdb_schema *schema,
 147                                  struct ldb_message *sd_msg,
 148                                  struct ldb_message *msg,
 149                                  struct acl_context *ac)
 150 {
 151         struct ldb_message_element *oc_el;
 152         struct ldb_context *ldb = ldb_module_get_ctx(module);
 153         TALLOC_CTX *mem_ctx;
 154         const char **attr_list;
 155         int i, ret;
 156
 157         /* If we don't have a schema yet, we can't do anything... */
 158         if (schema == NULL) {
 159                 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 160                 return LDB_ERR_OPERATIONS_ERROR;
 161         }
 162
 163         /* Must remove any existing attribute */
 164         if (ac->allowedAttributes) {
 165                 ldb_msg_remove_attr(msg, "allowedAttributes");
 166         }
 167
 168         mem_ctx = talloc_new(msg);
 169         if (!mem_ctx) {
 170                 return ldb_oom(ldb);
 171         }
 172
 173         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 174         attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
 175         if (!attr_list) {
 176                 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
 177                 talloc_free(mem_ctx);
 178                 return LDB_ERR_OPERATIONS_ERROR;
 179         }
 180         if (ac->allowedAttributes) {
 181                 for (i=0; attr_list && attr_list[i]; i++) {
 182                         ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
 183                 }
 184         }
 185         if (ac->allowedAttributesEffective) {
 186                 struct security_descriptor *sd;
 187                 struct dom_sid *sid = NULL;
 188                 struct ldb_control *as_system = ldb_request_get_control(ac->req,
 189                                                                         LDB_CONTROL_AS_SYSTEM_OID);
 190
 191                 if (as_system != NULL) {
 192                         as_system->critical = 0;
 193                 }
 194
 195                 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
 196                 if (ac->am_system || as_system) {
 197                         for (i=0; attr_list && attr_list[i]; i++) {
 198                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 199                         }
 200                         return LDB_SUCCESS;
 201                 }
 202
 203                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), mem_ctx, sd_msg, &sd);
 204
 205                 if (ret != LDB_SUCCESS) {
 206                         return ret;
 207                 }
 208
 209                 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
 210                 for (i=0; attr_list && attr_list[i]; i++) {
 211                         const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
 212                                                                                         attr_list[i]);
 213                         if (!attr) {
 214                                 return ldb_operr(ldb);
 215                         }
 216                         /* remove constructed attributes */
 217                         if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
 218                             || attr->systemOnly
 219                             || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
 220                                 continue;
 221                         }
 222                         ret = acl_check_access_on_attribute(module,
 223                                                             msg,
 224                                                             sd,
 225                                                             sid,
 226                                                             SEC_ADS_WRITE_PROP,
 227                                                             attr);
 228                         if (ret == LDB_SUCCESS) {
 229                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 230                         }
 231                 }
 232         }
 233         return LDB_SUCCESS;
 234 }
 235
 236 static int acl_childClasses(struct ldb_module *module,
 237                             const struct dsdb_schema *schema,
 238                             struct ldb_message *sd_msg,
 239                             struct ldb_message *msg,
 240                             const char *attrName)
 241 {
 242         struct ldb_message_element *oc_el;
 243         struct ldb_message_element *allowedClasses;
 244         const struct dsdb_class *sclass;
 245         unsigned int i, j;
 246         int ret;
 247
 248         /* If we don't have a schema yet, we can't do anything... */
 249         if (schema == NULL) {
 250                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 251                 return LDB_ERR_OPERATIONS_ERROR;
 252         }
 253
 254         /* Must remove any existing attribute, or else confusion reins */
 255         ldb_msg_remove_attr(msg, attrName);
 256         ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
 257         if (ret != LDB_SUCCESS) {
 258                 return ret;
 259         }
 260
 261         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 262
 263         for (i=0; oc_el && i < oc_el->num_values; i++) {
 264                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 265                 if (!sclass) {
 266                         /* We don't know this class?  what is going on? */
 267                         continue;
 268                 }
 269
 270                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 271                         ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
 272                 }
 273         }
 274         if (allowedClasses->num_values > 1) {
 275                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 276                 for (i=1 ; i < allowedClasses->num_values; i++) {
 277                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 278                         struct ldb_val *val2 = &allowedClasses->values[i];
 279                         if (data_blob_cmp(val1, val2) == 0) {
 280                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
 281                                 allowedClasses->num_values--;
 282                                 i--;
 283                         }
 284                 }
 285         }
 286
 287         return LDB_SUCCESS;
 288 }
 289
 290 static int acl_childClassesEffective(struct ldb_module *module,
 291                                      const struct dsdb_schema *schema,
 292                                      struct ldb_message *sd_msg,
 293                                      struct ldb_message *msg,
 294                                      struct acl_context *ac)
 295 {
 296         struct ldb_message_element *oc_el;
 297         struct ldb_message_element *allowedClasses = NULL;
 298         const struct dsdb_class *sclass;
 299         struct security_descriptor *sd;
 300         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 301                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 302         struct dom_sid *sid = NULL;
 303         unsigned int i, j;
 304         int ret;
 305
 306         if (as_system != NULL) {
 307                 as_system->critical = 0;
 308         }
 309
 310         if (ac->am_system || as_system) {
 311                 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
 312         }
 313
 314         /* If we don't have a schema yet, we can't do anything... */
 315         if (schema == NULL) {
 316                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 317                 return LDB_ERR_OPERATIONS_ERROR;
 318         }
 319
 320         /* Must remove any existing attribute, or else confusion reins */
 321         ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
 322
 323         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 324         ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 325         if (ret != LDB_SUCCESS) {
 326                 return ret;
 327         }
 328
 329         sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 330         for (i=0; oc_el && i < oc_el->num_values; i++) {
 331                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 332                 if (!sclass) {
 333                         /* We don't know this class?  what is going on? */
 334                         continue;
 335                 }
 336
 337                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 338                         ret = acl_check_access_on_class(module,
 339                                                         schema,
 340                                                         msg,
 341                                                         sd,
 342                                                         sid,
 343                                                         SEC_ADS_CREATE_CHILD,
 344                                                         sclass->possibleInferiors[j]);
 345                         if (ret == LDB_SUCCESS) {
 346                                 ldb_msg_add_string(msg, "allowedChildClassesEffective",
 347                                                    sclass->possibleInferiors[j]);
 348                         }
 349                 }
 350         }
 351         allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
 352         if (!allowedClasses) {
 353                 return LDB_SUCCESS;
 354         }
 355
 356         if (allowedClasses->num_values > 1) {
 357                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 358                 for (i=1 ; i < allowedClasses->num_values; i++) {
 359                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 360                         struct ldb_val *val2 = &allowedClasses->values[i];
 361                         if (data_blob_cmp(val1, val2) == 0) {
 362                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
 363                                 allowedClasses->num_values--;
 364                                 i--;
 365                         }
 366                 }
 367         }
 368         return LDB_SUCCESS;
 369 }
 370
 371 static int acl_sDRightsEffective(struct ldb_module *module,
 372                                  struct ldb_message *sd_msg,
 373                                  struct ldb_message *msg,
 374                                  struct acl_context *ac)
 375 {
 376         struct ldb_message_element *rightsEffective;
 377         int ret;
 378         struct security_descriptor *sd;
 379         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 380                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 381         struct dom_sid *sid = NULL;
 382         uint32_t flags = 0;
 383
 384         if (as_system != NULL) {
 385                 as_system->critical = 0;
 386         }
 387
 388         /* Must remove any existing attribute, or else confusion reins */
 389         ldb_msg_remove_attr(msg, "sDRightsEffective");
 390         ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
 391         if (ret != LDB_SUCCESS) {
 392                 return ret;
 393         }
 394         if (ac->am_system || as_system) {
 395                 flags = SECINFO_OWNER | SECINFO_GROUP |  SECINFO_SACL |  SECINFO_DACL;
 396         }
 397         else {
 398                 /* Get the security descriptor from the message */
 399                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 400                 if (ret != LDB_SUCCESS) {
 401                         return ret;
 402                 }
 403                 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 404                 ret = acl_check_access_on_attribute(module,
 405                                                     msg,
 406                                                     sd,
 407                                                     sid,
 408                                                     SEC_STD_WRITE_OWNER,
 409                                                     NULL);
 410                 if (ret == LDB_SUCCESS) {
 411                         flags |= SECINFO_OWNER | SECINFO_GROUP;
 412                 }
 413                 ret = acl_check_access_on_attribute(module,
 414                                                     msg,
 415                                                     sd,
 416                                                     sid,
 417                                                     SEC_STD_WRITE_DAC,
 418                                                     NULL);
 419                 if (ret == LDB_SUCCESS) {
 420                         flags |= SECINFO_DACL;
 421                 }
 422                 ret = acl_check_access_on_attribute(module,
 423                                                     msg,
 424                                                     sd,
 425                                                     sid,
 426                                                     SEC_FLAG_SYSTEM_SECURITY,
 427                                                     NULL);
 428                 if (ret == LDB_SUCCESS) {
 429                         flags |= SECINFO_SACL;
 430                 }
 431         }
 432         return samdb_msg_add_uint(ldb_module_get_ctx(module), msg, msg,
 433                                   "sDRightsEffective", flags);
 434 }
 435
 436 static int acl_validate_spn_value(TALLOC_CTX *mem_ctx,
 437                                   struct ldb_context *ldb,
 438                                   const char *spn_value,
 439                                   uint32_t userAccountControl,
 440                                   const char *samAccountName,
 441                                   const char *dnsHostName,
 442                                   const char *netbios_name,
 443                                   const char *ntds_guid)
 444 {
 445         int ret;
 446         krb5_context krb_ctx;
 447         krb5_error_code kerr;
 448         krb5_principal principal;
 449         char *instanceName;
 450         char *serviceType;
 451         char *serviceName;
 452         const char *realm;
 453         const char *forest_name = samdb_forest_name(ldb, mem_ctx);
 454         const char *base_domain = samdb_default_domain_name(ldb, mem_ctx);
 455         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
 456                                                           struct loadparm_context);
 457         bool is_dc = (userAccountControl & UF_SERVER_TRUST_ACCOUNT) ||
 458                 (userAccountControl & UF_PARTIAL_SECRETS_ACCOUNT);
 459
 460         kerr = smb_krb5_init_context_basic(mem_ctx,
 461                                            lp_ctx,
 462                                            &krb_ctx);
 463         if (kerr != 0) {
 464                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 465                                  "Could not initialize kerberos context.");
 466         }
 467
 468         ret = krb5_parse_name(krb_ctx, spn_value, &principal);
 469         if (ret) {
 470                 krb5_free_context(krb_ctx);
 471                 return LDB_ERR_CONSTRAINT_VIOLATION;
 472         }
 473
 474         instanceName = principal->name.name_string.val[1];
 475         serviceType = principal->name.name_string.val[0];
 476         realm = krb5_principal_get_realm(krb_ctx, principal);
 477         if (principal->name.name_string.len == 3) {
 478                 serviceName = principal->name.name_string.val[2];
 479         } else {
 480                 serviceName = NULL;
 481         }
 482
 483         if (serviceName) {
 484                 if (!is_dc) {
 485                         goto fail;
 486                 }
 487                 if (strcasecmp(serviceType, "ldap") == 0) {
 488                         if (strcasecmp(serviceName, netbios_name) != 0 &&
 489                             strcasecmp(serviceName, forest_name) != 0) {
 490                                 goto fail;
 491                         }
 492
 493                 } else if (strcasecmp(serviceType, "gc") == 0) {
 494                         if (strcasecmp(serviceName, forest_name) != 0) {
 495                                 goto fail;
 496                         }
 497                 } else {
 498                         if (strcasecmp(serviceName, base_domain) != 0 &&
 499                             strcasecmp(serviceName, netbios_name) != 0) {
 500                                 goto fail;
 501                         }
 502                 }
 503         }
 504         /* instanceName can be samAccountName without $ or dnsHostName
 505          * or "ntds_guid._msdcs.forest_domain for DC objects */
 506         if (strncasecmp(instanceName, samAccountName, strlen(samAccountName) - 1) == 0) {
 507                 goto success;
 508         } else if (strcasecmp(instanceName, dnsHostName) == 0) {
 509                 goto success;
 510         } else if (is_dc) {
 511                 const char *guid_str;
 512                 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
 513                                            ntds_guid,
 514                                            forest_name);
 515                 if (strcasecmp(instanceName, guid_str) == 0) {
 516                         goto success;
 517                 }
 518         }
 519
 520 fail:
 521         krb5_free_principal(krb_ctx, principal);
 522         krb5_free_context(krb_ctx);
 523         return LDB_ERR_CONSTRAINT_VIOLATION;
 524
 525 success:
 526         krb5_free_principal(krb_ctx, principal);
 527         krb5_free_context(krb_ctx);
 528         return LDB_SUCCESS;
 529 }
 530
 531 static int acl_check_spn(TALLOC_CTX *mem_ctx,
 532                          struct ldb_module *module,
 533                          struct ldb_request *req,
 534                          struct security_descriptor *sd,
 535                          struct dom_sid *sid,
 536                          const struct GUID *oc_guid,
 537                          const struct dsdb_attribute *attr)
 538 {
 539         int ret;
 540         unsigned int i;
 541         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 542         struct ldb_context *ldb = ldb_module_get_ctx(module);
 543         struct ldb_result *acl_res;
 544         struct ldb_result *netbios_res;
 545         struct ldb_message_element *el;
 546         struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
 547         uint32_t userAccountControl;
 548         const char *samAccountName;
 549         const char *dnsHostName;
 550         const char *netbios_name;
 551         struct GUID ntds;
 552         char *ntds_guid = NULL;
 553
 554         static const char *acl_attrs[] = {
 555                 "samAccountName",
 556                 "dnsHostName",
 557                 "userAccountControl",
 558                 NULL
 559         };
 560         static const char *netbios_attrs[] = {
 561                 "nETBIOSName",
 562                 NULL
 563         };
 564
 565         /* if we have wp, we can do whatever we like */
 566         if (acl_check_access_on_attribute(module,
 567                                           tmp_ctx,
 568                                           sd,
 569                                           sid,
 570                                           SEC_ADS_WRITE_PROP,
 571                                           attr) == LDB_SUCCESS) {
 572                 talloc_free(tmp_ctx);
 573                 return LDB_SUCCESS;
 574         }
 575
 576         ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 577                                        GUID_DRS_VALIDATE_SPN,
 578                                        SEC_ADS_SELF_WRITE,
 579                                        sid);
 580
 581         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 582                 dsdb_acl_debug(sd, acl_user_token(module),
 583                                req->op.mod.message->dn,
 584                                true,
 585                                10);
 586                 talloc_free(tmp_ctx);
 587                 return ret;
 588         }
 589
 590         ret = dsdb_module_search_dn(module, tmp_ctx,
 591                                     &acl_res, req->op.mod.message->dn,
 592                                     acl_attrs,
 593                                     DSDB_FLAG_NEXT_MODULE |
 594                                     DSDB_SEARCH_SHOW_DELETED, req);
 595         if (ret != LDB_SUCCESS) {
 596                 talloc_free(tmp_ctx);
 597                 return ret;
 598         }
 599
 600         userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
 601         dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
 602         samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
 603
 604         ret = dsdb_module_search(module, tmp_ctx,
 605                                  &netbios_res, partitions_dn,
 606                                  LDB_SCOPE_ONELEVEL,
 607                                  netbios_attrs,
 608                                  DSDB_FLAG_NEXT_MODULE,
 609                                  req,
 610                                  "(ncName=%s)",
 611                                  ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
 612
 613         netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
 614
 615         el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
 616         if (!el) {
 617                 talloc_free(tmp_ctx);
 618                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 619                                          "Error finding element for servicePrincipalName.");
 620         }
 621
 622         /* NTDSDSA objectGuid of object we are checking SPN for */
 623         if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
 624                 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
 625                                                              req->op.mod.message->dn, &ntds, req);
 626                 if (ret != LDB_SUCCESS) {
 627                         ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
 628                                                ldb_dn_get_linearized(req->op.mod.message->dn),
 629                                                ldb_strerror(ret));
 630                         talloc_free(tmp_ctx);
 631                         return LDB_ERR_OPERATIONS_ERROR;
 632                 }
 633                 ntds_guid = GUID_string(tmp_ctx, &ntds);
 634         }
 635
 636         for (i=0; i < el->num_values; i++) {
 637                 ret = acl_validate_spn_value(tmp_ctx,
 638                                              ldb,
 639                                              (char *)el->values[i].data,
 640                                              userAccountControl,
 641                                              samAccountName,
 642                                              dnsHostName,
 643                                              netbios_name,
 644                                              ntds_guid);
 645                 if (ret != LDB_SUCCESS) {
 646                         talloc_free(tmp_ctx);
 647                         return ret;
 648                 }
 649         }
 650         talloc_free(tmp_ctx);
 651         return LDB_SUCCESS;
 652 }
 653
 654 static int acl_add(struct ldb_module *module, struct ldb_request *req)
 655 {
 656         int ret;
 657         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
 658         struct ldb_context *ldb;
 659         const struct dsdb_schema *schema;
 660         struct ldb_message_element *oc_el;
 661         const struct GUID *guid;
 662         struct ldb_dn *nc_root;
 663         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 664
 665         if (as_system != NULL) {
 666                 as_system->critical = 0;
 667         }
 668
 669         if (dsdb_module_am_system(module) || as_system) {
 670                 return ldb_next_request(module, req);
 671         }
 672         if (ldb_dn_is_special(req->op.add.message->dn)) {
 673                 return ldb_next_request(module, req);
 674         }
 675
 676         ldb = ldb_module_get_ctx(module);
 677
 678         /* Creating an NC. There is probably something we should do here,
 679          * but we will establish that later */
 680
 681         ret = dsdb_find_nc_root(ldb, req, req->op.add.message->dn, &nc_root);
 682         if (ret != LDB_SUCCESS) {
 683                 return ret;
 684         }
 685         if (ldb_dn_compare(nc_root, req->op.add.message->dn) == 0) {
 686                 talloc_free(nc_root);
 687                 return ldb_next_request(module, req);
 688         }
 689         talloc_free(nc_root);
 690
 691         schema = dsdb_get_schema(ldb, req);
 692         if (!schema) {
 693                 return ldb_operr(ldb);
 694         }
 695
 696         oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
 697         if (!oc_el || oc_el->num_values == 0) {
 698                 DEBUG(10,("acl:operation error %s\n", ldb_dn_get_linearized(req->op.add.message->dn)));
 699                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 700         }
 701
 702         guid = class_schemaid_guid_by_lDAPDisplayName(schema,
 703                                                       (char *)oc_el->values[oc_el->num_values-1].data);
 704         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid, req);
 705         if (ret != LDB_SUCCESS) {
 706                 return ret;
 707         }
 708         return ldb_next_request(module, req);
 709 }
 710
 711 /* ckecks if modifications are allowed on "Member" attribute */
 712 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
 713                                      struct ldb_module *module,
 714                                      struct ldb_request *req,
 715                                      struct security_descriptor *sd,
 716                                      struct dom_sid *sid,
 717                                      const struct GUID *oc_guid,
 718                                      const struct dsdb_attribute *attr)
 719 {
 720         int ret;
 721         unsigned int i;
 722         struct ldb_context *ldb = ldb_module_get_ctx(module);
 723         struct ldb_dn *user_dn;
 724         struct ldb_message_element *member_el;
 725         /* if we have wp, we can do whatever we like */
 726         if (acl_check_access_on_attribute(module,
 727                                           mem_ctx,
 728                                           sd,
 729                                           sid,
 730                                           SEC_ADS_WRITE_PROP,
 731                                           attr) == LDB_SUCCESS) {
 732                 return LDB_SUCCESS;
 733         }
 734         /* if we are adding/deleting ourselves, check for self membership */
 735         ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
 736                                   &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
 737                                   &user_dn);
 738         if (ret != LDB_SUCCESS) {
 739                 return ret;
 740         }
 741         member_el = ldb_msg_find_element(req->op.mod.message, "member");
 742         if (!member_el) {
 743                 return ldb_operr(ldb);
 744         }
 745         /* user can only remove oneself */
 746         if (member_el->num_values == 0) {
 747                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 748         }
 749         for (i = 0; i < member_el->num_values; i++) {
 750                 if (strcasecmp((const char *)member_el->values[i].data,
 751                                ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
 752                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 753                 }
 754         }
 755         ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
 756                                        GUID_DRS_SELF_MEMBERSHIP,
 757                                        SEC_ADS_SELF_WRITE,
 758                                        sid);
 759         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 760                 dsdb_acl_debug(sd, acl_user_token(module),
 761                                req->op.mod.message->dn,
 762                                true,
 763                                10);
 764         }
 765         return ret;
 766 }
 767
 768 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
 769                                      struct ldb_module *module,
 770                                      struct ldb_request *req,
 771                                      struct security_descriptor *sd,
 772                                      struct dom_sid *sid,
 773                                      const struct GUID *oc_guid,
 774                                      bool userPassword)
 775 {
 776         int ret = LDB_SUCCESS;
 777         unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
 778         struct ldb_message_element *el;
 779         struct ldb_message *msg;
 780         const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
 781                                         "unicodePwd", "dBCSPwd", NULL }, **l;
 782         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 783
 784         msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
 785         if (msg == NULL) {
 786                 return ldb_module_oom(module);
 787         }
 788         for (l = passwordAttrs; *l != NULL; l++) {
 789                 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
 790                         continue;
 791                 }
 792
 793                 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
 794                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
 795                                 ++del_attr_cnt;
 796                         }
 797                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
 798                                 ++add_attr_cnt;
 799                         }
 800                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
 801                                 ++rep_attr_cnt;
 802                         }
 803                         ldb_msg_remove_element(msg, el);
 804                 }
 805         }
 806
 807         /* single deletes will be handled by the "password_hash" LDB module
 808          * later in the stack, so we let it though here */
 809         if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
 810                 talloc_free(tmp_ctx);
 811                 return LDB_SUCCESS;
 812         }
 813
 814         if (ldb_request_get_control(req,
 815                                     DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
 816                 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
 817                  * have a user password change and not a set as the message
 818                  * looks like. In it's value blob it contains the NT and/or LM
 819                  * hash of the old password specified by the user.
 820                  * This control is used by the SAMR and "kpasswd" password
 821                  * change mechanisms. */
 822                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 823                                                GUID_DRS_USER_CHANGE_PASSWORD,
 824                                                SEC_ADS_CONTROL_ACCESS,
 825                                                sid);
 826         }
 827         else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
 828                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 829                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
 830                                                SEC_ADS_CONTROL_ACCESS,
 831                                                sid);
 832         }
 833         else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
 834                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 835                                                GUID_DRS_USER_CHANGE_PASSWORD,
 836                                                SEC_ADS_CONTROL_ACCESS,
 837                                                sid);
 838                 /* Very strange, but we get constraint violation in this case */
 839                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 840                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
 841                 }
 842         }
 843         if (ret != LDB_SUCCESS) {
 844                 dsdb_acl_debug(sd, acl_user_token(module),
 845                                req->op.mod.message->dn,
 846                                true,
 847                                10);
 848         }
 849         talloc_free(tmp_ctx);
 850         return ret;
 851 }
 852
 853 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
 854 {
 855         int ret;
 856         struct ldb_context *ldb = ldb_module_get_ctx(module);
 857         const struct dsdb_schema *schema;
 858         unsigned int i;
 859         const struct GUID *guid;
 860         uint32_t access_granted;
 861         struct object_tree *root = NULL;
 862         struct object_tree *new_node = NULL;
 863         NTSTATUS status;
 864         struct ldb_result *acl_res;
 865         struct security_descriptor *sd;
 866         struct dom_sid *sid = NULL;
 867         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 868         bool userPassword = dsdb_user_password_support(module, req, req);
 869         TALLOC_CTX *tmp_ctx = talloc_new(req);
 870         static const char *acl_attrs[] = {
 871                 "nTSecurityDescriptor",
 872                 "objectClass",
 873                 "objectSid",
 874                 NULL
 875         };
 876
 877         if (as_system != NULL) {
 878                 as_system->critical = 0;
 879         }
 880
 881         /* Don't print this debug statement if elements[0].name is going to be NULL */
 882         if(req->op.mod.message->num_elements > 0)
 883         {
 884                 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
 885         }
 886         if (dsdb_module_am_system(module) || as_system) {
 887                 return ldb_next_request(module, req);
 888         }
 889         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 890                 return ldb_next_request(module, req);
 891         }
 892         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
 893                                     acl_attrs,
 894                                     DSDB_FLAG_NEXT_MODULE, req);
 895
 896         if (ret != LDB_SUCCESS) {
 897                 goto fail;
 898         }
 899
 900         schema = dsdb_get_schema(ldb, tmp_ctx);
 901         if (!schema) {
 902                 ret = LDB_ERR_OPERATIONS_ERROR;
 903                 goto fail;
 904         }
 905
 906         ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
 907         if (ret != LDB_SUCCESS) {
 908                 talloc_free(tmp_ctx);
 909                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 910                                  "acl_modify: Error retrieving security descriptor.");
 911         }
 912         /* Theoretically we pass the check if the object has no sd */
 913         if (!sd) {
 914                 goto success;
 915         }
 916
 917         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
 918         if (!guid) {
 919                 talloc_free(tmp_ctx);
 920                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 921                                  "acl_modify: Error retrieving object class GUID.");
 922         }
 923         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
 924         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 925                                    &root, &new_node)) {
 926                 talloc_free(tmp_ctx);
 927                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 928                                  "acl_modify: Error adding new node in object tree.");
 929         }
 930         for (i=0; i < req->op.mod.message->num_elements; i++){
 931                 const struct dsdb_attribute *attr;
 932                 attr = dsdb_attribute_by_lDAPDisplayName(schema,
 933                                                          req->op.mod.message->elements[i].name);
 934
 935                 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
 936                         status = sec_access_check_ds(sd, acl_user_token(module),
 937                                              SEC_STD_WRITE_DAC,
 938                                              &access_granted,
 939                                              NULL,
 940                                              sid);
 941
 942                         if (!NT_STATUS_IS_OK(status)) {
 943                                 DEBUG(10, ("Object %s has no write dacl access\n",
 944                                            ldb_dn_get_linearized(req->op.mod.message->dn)));
 945                                 dsdb_acl_debug(sd,
 946                                                acl_user_token(module),
 947                                                req->op.mod.message->dn,
 948                                                true,
 949                                                10);
 950                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 951                                 goto fail;
 952                         }
 953                 }
 954                 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
 955                         ret = acl_check_self_membership(tmp_ctx,
 956                                                         module,
 957                                                         req,
 958                                                         sd,
 959                                                         sid,
 960                                                         guid,
 961                                                         attr);
 962                         if (ret != LDB_SUCCESS) {
 963                                 goto fail;
 964                         }
 965                 }
 966                 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
 967                         /* this one is not affected by any rights, we should let it through
 968                            so that passwords_hash returns the correct error */
 969                         continue;
 970                 }
 971                 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
 972                          (userPassword && ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0) ||
 973                          ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
 974                         ret = acl_check_password_rights(tmp_ctx,
 975                                                         module,
 976                                                         req,
 977                                                         sd,
 978                                                         sid,
 979                                                         guid,
 980                                                         userPassword);
 981                         if (ret != LDB_SUCCESS) {
 982                                 goto fail;
 983                         }
 984                 } else if (ldb_attr_cmp("servicePrincipalName", req->op.mod.message->elements[i].name) == 0) {
 985                         ret = acl_check_spn(tmp_ctx,
 986                                             module,
 987                                             req,
 988                                             sd,
 989                                             sid,
 990                                             guid,
 991                                             attr);
 992                         if (ret != LDB_SUCCESS) {
 993                                 goto fail;
 994                         }
 995                 } else {
 996
 997                 /* This basic attribute existence check with the right errorcode
 998                  * is needed since this module is the first one which requests
 999                  * schema attribute information.
1000                  * The complete attribute checking is done in the
1001                  * "objectclass_attrs" module behind this one.
1002                  */
1003                         if (!attr) {
1004                                 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
1005                                                        req->op.mod.message->elements[i].name,
1006                                                ldb_dn_get_linearized(req->op.mod.message->dn));
1007                                 ret =  LDB_ERR_NO_SUCH_ATTRIBUTE;
1008                                 goto fail;
1009                         }
1010                         if (!insert_in_object_tree(tmp_ctx,
1011                                                    &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
1012                                                    &new_node, &new_node)) {
1013                                 DEBUG(10, ("acl_modify: cannot add to object tree securityGUID\n"));
1014                                 ret = LDB_ERR_OPERATIONS_ERROR;
1015                                 goto fail;
1016                         }
1017
1018                         if (!insert_in_object_tree(tmp_ctx,
1019                                                    &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
1020                                 DEBUG(10, ("acl_modify: cannot add to object tree attributeGUID\n"));
1021                                 ret = LDB_ERR_OPERATIONS_ERROR;
1022                                 goto fail;
1023                         }
1024                 }
1025         }
1026
1027         if (root->num_of_children > 0) {
1028                 status = sec_access_check_ds(sd, acl_user_token(module),
1029                                              SEC_ADS_WRITE_PROP,
1030                                              &access_granted,
1031                                              root,
1032                                              sid);
1033
1034                 if (!NT_STATUS_IS_OK(status)) {
1035                         DEBUG(10, ("Object %s has no write property access\n",
1036                                    ldb_dn_get_linearized(req->op.mod.message->dn)));
1037                         dsdb_acl_debug(sd,
1038                                   acl_user_token(module),
1039                                   req->op.mod.message->dn,
1040                                   true,
1041                                   10);
1042                         ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1043                         goto fail;
1044                 }
1045         }
1046
1047 success:
1048         talloc_free(tmp_ctx);
1049         return ldb_next_request(module, req);
1050 fail:
1051         talloc_free(tmp_ctx);
1052         return ret;
1053 }
1054
1055 /* similar to the modify for the time being.
1056  * We need to consider the special delete tree case, though - TODO */
1057 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1058 {
1059         int ret;
1060         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
1061         struct ldb_context *ldb;
1062         struct ldb_dn *nc_root;
1063         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1064
1065         if (as_system != NULL) {
1066                 as_system->critical = 0;
1067         }
1068
1069         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1070         if (dsdb_module_am_system(module) || as_system) {
1071                 return ldb_next_request(module, req);
1072         }
1073         if (ldb_dn_is_special(req->op.del.dn)) {
1074                 return ldb_next_request(module, req);
1075         }
1076
1077         ldb = ldb_module_get_ctx(module);
1078
1079         /* Make sure we aren't deleting a NC */
1080
1081         ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1082         if (ret != LDB_SUCCESS) {
1083                 return ret;
1084         }
1085         if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1086                 talloc_free(nc_root);
1087                 DEBUG(10,("acl:deleting a NC\n"));
1088                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1089                 return ldb_module_done(req, NULL, NULL,
1090                                        LDB_ERR_UNWILLING_TO_PERFORM);
1091         }
1092         talloc_free(nc_root);
1093
1094         /* First check if we have delete object right */
1095         ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn,
1096                                              SEC_STD_DELETE, NULL, req);
1097         if (ret == LDB_SUCCESS) {
1098                 return ldb_next_request(module, req);
1099         }
1100
1101         /* Nope, we don't have delete object. Lets check if we have delete
1102          * child on the parent */
1103         ret = dsdb_module_check_access_on_dn(module, req, parent,
1104                                              SEC_ADS_DELETE_CHILD, NULL, req);
1105         if (ret != LDB_SUCCESS) {
1106                 return ret;
1107         }
1108
1109         return ldb_next_request(module, req);
1110 }
1111
1112 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1113 {
1114         int ret;
1115         struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
1116         struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
1117         const struct dsdb_schema *schema;
1118         struct ldb_context *ldb;
1119         struct security_descriptor *sd = NULL;
1120         struct dom_sid *sid = NULL;
1121         struct ldb_result *acl_res;
1122         const struct GUID *guid;
1123         struct ldb_dn *nc_root;
1124         struct object_tree *root = NULL;
1125         struct object_tree *new_node = NULL;
1126         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1127         TALLOC_CTX *tmp_ctx = talloc_new(req);
1128         NTSTATUS status;
1129         uint32_t access_granted;
1130         const char *rdn_name;
1131         static const char *acl_attrs[] = {
1132                 "nTSecurityDescriptor",
1133                 "objectClass",
1134                 "objectSid",
1135                 NULL
1136         };
1137
1138         if (as_system != NULL) {
1139                 as_system->critical = 0;
1140         }
1141
1142         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1143         if (dsdb_module_am_system(module) || as_system) {
1144                 return ldb_next_request(module, req);
1145         }
1146         if (ldb_dn_is_special(req->op.rename.olddn)) {
1147                 return ldb_next_request(module, req);
1148         }
1149
1150         ldb = ldb_module_get_ctx(module);
1151
1152         /* Make sure we aren't renaming/moving a NC */
1153
1154         ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1155         if (ret != LDB_SUCCESS) {
1156                 return ret;
1157         }
1158         if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1159                 talloc_free(nc_root);
1160                 DEBUG(10,("acl:renaming/moving a NC\n"));
1161                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1162                 return ldb_module_done(req, NULL, NULL,
1163                                        LDB_ERR_UNWILLING_TO_PERFORM);
1164         }
1165         talloc_free(nc_root);
1166
1167         /* Look for the parent */
1168
1169         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1170                                     req->op.rename.olddn, acl_attrs,
1171                                     DSDB_FLAG_NEXT_MODULE |
1172                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1173         /* we sould be able to find the parent */
1174         if (ret != LDB_SUCCESS) {
1175                 DEBUG(10,("acl: failed to find object %s\n",
1176                           ldb_dn_get_linearized(req->op.rename.olddn)));
1177                 talloc_free(tmp_ctx);
1178                 return ret;
1179         }
1180
1181         schema = dsdb_get_schema(ldb, acl_res);
1182         if (!schema) {
1183                 talloc_free(tmp_ctx);
1184                 return ldb_operr(ldb);
1185         }
1186
1187         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1188         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1189                                    &root, &new_node)) {
1190                 talloc_free(tmp_ctx);
1191                 return ldb_operr(ldb);
1192         };
1193
1194         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1195                                                           "name");
1196         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1197                                    &new_node, &new_node)) {
1198                 talloc_free(tmp_ctx);
1199                 return ldb_operr(ldb);
1200         };
1201
1202         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1203         if (rdn_name == NULL) {
1204                 talloc_free(tmp_ctx);
1205                 return ldb_operr(ldb);
1206         }
1207         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1208                                                           rdn_name);
1209         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1210                                    &new_node, &new_node)) {
1211                 talloc_free(tmp_ctx);
1212                 return ldb_operr(ldb);
1213         };
1214
1215         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1216
1217         if (ret != LDB_SUCCESS) {
1218                 talloc_free(tmp_ctx);
1219                 return ldb_operr(ldb);
1220         }
1221         /* Theoretically we pass the check if the object has no sd */
1222         if (!sd) {
1223                 talloc_free(tmp_ctx);
1224                 return LDB_SUCCESS;
1225         }
1226         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1227         status = sec_access_check_ds(sd, acl_user_token(module),
1228                                      SEC_ADS_WRITE_PROP,
1229                                      &access_granted,
1230                                      root,
1231                                      sid);
1232
1233         if (!NT_STATUS_IS_OK(status)) {
1234                 DEBUG(10, ("Object %s has no wp on name\n",
1235                            ldb_dn_get_linearized(req->op.rename.olddn)));
1236                 dsdb_acl_debug(sd,
1237                           acl_user_token(module),
1238                           req->op.rename.olddn,
1239                           true,
1240                           10);
1241                 talloc_free(tmp_ctx);
1242                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1243         }
1244
1245         if (ldb_dn_compare(oldparent, newparent) == 0) {
1246                 /* regular rename, not move, nothing more to do */
1247                 talloc_free(tmp_ctx);
1248                 return ldb_next_request(module, req);
1249         }
1250
1251         /* new parent should have create child */
1252         root = NULL;
1253         new_node = NULL;
1254         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1255         if (!guid) {
1256                 DEBUG(10,("acl:renamed object has no object class\n"));
1257                 talloc_free(tmp_ctx);
1258                 return ldb_module_done(req, NULL, NULL,  LDB_ERR_OPERATIONS_ERROR);
1259         }
1260
1261         ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid, req);
1262         if (ret != LDB_SUCCESS) {
1263                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1264                 talloc_free(tmp_ctx);
1265                 return ret;
1266         }
1267         /* do we have delete object on the object? */
1268
1269         status = sec_access_check_ds(sd, acl_user_token(module),
1270                                      SEC_STD_DELETE,
1271                                      &access_granted,
1272                                      NULL,
1273                                      sid);
1274
1275         if (NT_STATUS_IS_OK(status)) {
1276                 talloc_free(tmp_ctx);
1277                 return ldb_next_request(module, req);
1278         }
1279         /* what about delete child on the current parent */
1280         ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL, req);
1281         if (ret != LDB_SUCCESS) {
1282                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1283                 talloc_free(tmp_ctx);
1284                 return ldb_module_done(req, NULL, NULL, ret);
1285         }
1286
1287         talloc_free(tmp_ctx);
1288
1289         return ldb_next_request(module, req);
1290 }
1291
1292 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1293 {
1294         struct ldb_context *ldb;
1295         struct acl_context *ac;
1296         struct acl_private *data;
1297         struct ldb_result *acl_res;
1298         static const char *acl_attrs[] = {
1299                 "objectClass",
1300                 "nTSecurityDescriptor",
1301                 "objectSid",
1302                 NULL
1303         };
1304         int ret;
1305         unsigned int i;
1306
1307         ac = talloc_get_type(req->context, struct acl_context);
1308         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1309         ldb = ldb_module_get_ctx(ac->module);
1310
1311         if (!ares) {
1312                 return ldb_module_done(ac->req, NULL, NULL,
1313                                        LDB_ERR_OPERATIONS_ERROR);
1314         }
1315         if (ares->error != LDB_SUCCESS) {
1316                 return ldb_module_done(ac->req, ares->controls,
1317                                        ares->response, ares->error);
1318         }
1319
1320         switch (ares->type) {
1321         case LDB_REPLY_ENTRY:
1322                 if (ac->allowedAttributes
1323                     || ac->allowedChildClasses
1324                     || ac->allowedChildClassesEffective
1325                     || ac->allowedAttributesEffective
1326                     || ac->sDRightsEffective) {
1327                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1328                                                     acl_attrs,
1329                                                     DSDB_FLAG_NEXT_MODULE, req);
1330                         if (ret != LDB_SUCCESS) {
1331                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1332                         }
1333                         if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1334                                 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1335                                 if (ret != LDB_SUCCESS) {
1336                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1337                                 }
1338                         }
1339                         if (ac->allowedChildClasses) {
1340                                 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1341                                                        ares->message, "allowedChildClasses");
1342                                 if (ret != LDB_SUCCESS) {
1343                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1344                                 }
1345                         }
1346                         if (ac->allowedChildClassesEffective) {
1347                                 ret = acl_childClassesEffective(ac->module, ac->schema,
1348                                                                 acl_res->msgs[0], ares->message, ac);
1349                                 if (ret != LDB_SUCCESS) {
1350                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1351                                 }
1352                         }
1353                         if (ac->sDRightsEffective) {
1354                                 ret = acl_sDRightsEffective(ac->module,
1355                                                             acl_res->msgs[0], ares->message, ac);
1356                                 if (ret != LDB_SUCCESS) {
1357                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1358                                 }
1359                         }
1360                 }
1361                 if (data && data->password_attrs) {
1362                         if (!ac->am_system) {
1363                                 for (i = 0; data->password_attrs[i]; i++) {
1364                                         if ((!ac->userPassword) &&
1365                                             (ldb_attr_cmp(data->password_attrs[i],
1366                                                           "userPassword") == 0))
1367                                                 continue;
1368
1369                                         ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1370                                 }
1371                         }
1372                 }
1373                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1374
1375         case LDB_REPLY_REFERRAL:
1376                 return ldb_module_send_referral(ac->req, ares->referral);
1377
1378         case LDB_REPLY_DONE:
1379                 return ldb_module_done(ac->req, ares->controls,
1380                                        ares->response, LDB_SUCCESS);
1381
1382         }
1383         return LDB_SUCCESS;
1384 }
1385
1386 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1387 {
1388         struct ldb_context *ldb;
1389         struct acl_context *ac;
1390         struct ldb_request *down_req;
1391         struct acl_private *data;
1392         int ret;
1393         unsigned int i;
1394
1395         ldb = ldb_module_get_ctx(module);
1396
1397         ac = talloc_zero(req, struct acl_context);
1398         if (ac == NULL) {
1399                 return ldb_oom(ldb);
1400         }
1401         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1402
1403         ac->module = module;
1404         ac->req = req;
1405         ac->am_system = dsdb_module_am_system(module);
1406         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1407         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1408         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1409         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1410         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1411         ac->userPassword = dsdb_user_password_support(module, ac, req);
1412         ac->schema = dsdb_get_schema(ldb, ac);
1413
1414         /* replace any attributes in the parse tree that are private,
1415            so we don't allow a search for 'userPassword=penguin',
1416            just as we would not allow that attribute to be returned */
1417         if (ac->am_system) {
1418                 /* FIXME: We should copy the tree and keep the original unmodified. */
1419                 /* remove password attributes */
1420                 if (data && data->password_attrs) {
1421                         for (i = 0; data->password_attrs[i]; i++) {
1422                                 if ((!ac->userPassword) &&
1423                                     (ldb_attr_cmp(data->password_attrs[i],
1424                                                   "userPassword") == 0))
1425                                                 continue;
1426
1427                                 ldb_parse_tree_attr_replace(req->op.search.tree,
1428                                                             data->password_attrs[i],
1429                                                             "kludgeACLredactedattribute");
1430                         }
1431                 }
1432         }
1433         ret = ldb_build_search_req_ex(&down_req,
1434                                       ldb, ac,
1435                                       req->op.search.base,
1436                                       req->op.search.scope,
1437                                       req->op.search.tree,
1438                                       req->op.search.attrs,
1439                                       req->controls,
1440                                       ac, acl_search_callback,
1441                                       req);
1442         LDB_REQ_SET_LOCATION(down_req);
1443         if (ret != LDB_SUCCESS) {
1444                 return ret;
1445         }
1446         /* perform the search */
1447         return ldb_next_request(module, down_req);
1448 }
1449
1450 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1451 {
1452         struct ldb_context *ldb = ldb_module_get_ctx(module);
1453         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1454
1455         /* allow everybody to read the sequence number */
1456         if (strcmp(req->op.extended.oid,
1457                    LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1458                 return ldb_next_request(module, req);
1459         }
1460
1461         if (dsdb_module_am_system(module) ||
1462             dsdb_module_am_administrator(module) || as_system) {
1463                 return ldb_next_request(module, req);
1464         } else {
1465                 ldb_asprintf_errstring(ldb,
1466                                        "acl_extended: "
1467                                        "attempted database modify not permitted. "
1468                                        "User %s is not SYSTEM or an administrator",
1469                                        acl_user_name(req, module));
1470                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1471         }
1472 }
1473
1474 static const struct ldb_module_ops ldb_acl_module_ops = {
1475         .name              = "acl",
1476         .search            = acl_search,
1477         .add               = acl_add,
1478         .modify            = acl_modify,
1479         .del               = acl_delete,
1480         .rename            = acl_rename,
1481         .extended          = acl_extended,
1482         .init_context      = acl_module_init
1483 };
1484
1485 int ldb_acl_module_init(const char *version)
1486 {
1487         LDB_MODULE_CHECK_VERSION(version);
1488         return ldb_register_module(&ldb_acl_module_ops);
1489 }