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         if (strcasecmp_m(spn_value, samAccountName) == 0) {
 461                 /* MacOS X sets this value, and setting an SPN of your
 462                  * own samAccountName is both pointless and safe */
 463                 return LDB_SUCCESS;
 464         }
 465
 466         kerr = smb_krb5_init_context_basic(mem_ctx,
 467                                            lp_ctx,
 468                                            &krb_ctx);
 469         if (kerr != 0) {
 470                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 471                                  "Could not initialize kerberos context.");
 472         }
 473
 474         ret = krb5_parse_name(krb_ctx, spn_value, &principal);
 475         if (ret) {
 476                 krb5_free_context(krb_ctx);
 477                 return LDB_ERR_CONSTRAINT_VIOLATION;
 478         }
 479
 480         if (principal->name.name_string.len < 2) {
 481                 goto fail;
 482         }
 483
 484         instanceName = principal->name.name_string.val[1];
 485         serviceType = principal->name.name_string.val[0];
 486         realm = krb5_principal_get_realm(krb_ctx, principal);
 487         if (principal->name.name_string.len == 3) {
 488                 serviceName = principal->name.name_string.val[2];
 489         } else {
 490                 serviceName = NULL;
 491         }
 492
 493         if (serviceName) {
 494                 if (!is_dc) {
 495                         goto fail;
 496                 }
 497                 if (strcasecmp(serviceType, "ldap") == 0) {
 498                         if (strcasecmp(serviceName, netbios_name) != 0 &&
 499                             strcasecmp(serviceName, forest_name) != 0) {
 500                                 goto fail;
 501                         }
 502
 503                 } else if (strcasecmp(serviceType, "gc") == 0) {
 504                         if (strcasecmp(serviceName, forest_name) != 0) {
 505                                 goto fail;
 506                         }
 507                 } else {
 508                         if (strcasecmp(serviceName, base_domain) != 0 &&
 509                             strcasecmp(serviceName, netbios_name) != 0) {
 510                                 goto fail;
 511                         }
 512                 }
 513         }
 514         /* instanceName can be samAccountName without $ or dnsHostName
 515          * or "ntds_guid._msdcs.forest_domain for DC objects */
 516         if (strlen(instanceName) == (strlen(samAccountName) - 1)
 517             && strncasecmp(instanceName, samAccountName, strlen(samAccountName) - 1) == 0) {
 518                 goto success;
 519         } else if (strcasecmp(instanceName, dnsHostName) == 0) {
 520                 goto success;
 521         } else if (is_dc) {
 522                 const char *guid_str;
 523                 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
 524                                            ntds_guid,
 525                                            forest_name);
 526                 if (strcasecmp(instanceName, guid_str) == 0) {
 527                         goto success;
 528                 }
 529         }
 530
 531 fail:
 532         krb5_free_principal(krb_ctx, principal);
 533         krb5_free_context(krb_ctx);
 534         return LDB_ERR_CONSTRAINT_VIOLATION;
 535
 536 success:
 537         krb5_free_principal(krb_ctx, principal);
 538         krb5_free_context(krb_ctx);
 539         return LDB_SUCCESS;
 540 }
 541
 542 static int acl_check_spn(TALLOC_CTX *mem_ctx,
 543                          struct ldb_module *module,
 544                          struct ldb_request *req,
 545                          struct security_descriptor *sd,
 546                          struct dom_sid *sid,
 547                          const struct GUID *oc_guid,
 548                          const struct dsdb_attribute *attr)
 549 {
 550         int ret;
 551         unsigned int i;
 552         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 553         struct ldb_context *ldb = ldb_module_get_ctx(module);
 554         struct ldb_result *acl_res;
 555         struct ldb_result *netbios_res;
 556         struct ldb_message_element *el;
 557         struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
 558         uint32_t userAccountControl;
 559         const char *samAccountName;
 560         const char *dnsHostName;
 561         const char *netbios_name;
 562         struct GUID ntds;
 563         char *ntds_guid = NULL;
 564
 565         static const char *acl_attrs[] = {
 566                 "samAccountName",
 567                 "dnsHostName",
 568                 "userAccountControl",
 569                 NULL
 570         };
 571         static const char *netbios_attrs[] = {
 572                 "nETBIOSName",
 573                 NULL
 574         };
 575
 576         /* if we have wp, we can do whatever we like */
 577         if (acl_check_access_on_attribute(module,
 578                                           tmp_ctx,
 579                                           sd,
 580                                           sid,
 581                                           SEC_ADS_WRITE_PROP,
 582                                           attr) == LDB_SUCCESS) {
 583                 talloc_free(tmp_ctx);
 584                 return LDB_SUCCESS;
 585         }
 586
 587         ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 588                                        GUID_DRS_VALIDATE_SPN,
 589                                        SEC_ADS_SELF_WRITE,
 590                                        sid);
 591
 592         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 593                 dsdb_acl_debug(sd, acl_user_token(module),
 594                                req->op.mod.message->dn,
 595                                true,
 596                                10);
 597                 talloc_free(tmp_ctx);
 598                 return ret;
 599         }
 600
 601         ret = dsdb_module_search_dn(module, tmp_ctx,
 602                                     &acl_res, req->op.mod.message->dn,
 603                                     acl_attrs,
 604                                     DSDB_FLAG_NEXT_MODULE |
 605                                     DSDB_SEARCH_SHOW_DELETED, req);
 606         if (ret != LDB_SUCCESS) {
 607                 talloc_free(tmp_ctx);
 608                 return ret;
 609         }
 610
 611         userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
 612         dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
 613         samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
 614
 615         ret = dsdb_module_search(module, tmp_ctx,
 616                                  &netbios_res, partitions_dn,
 617                                  LDB_SCOPE_ONELEVEL,
 618                                  netbios_attrs,
 619                                  DSDB_FLAG_NEXT_MODULE,
 620                                  req,
 621                                  "(ncName=%s)",
 622                                  ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
 623
 624         netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
 625
 626         el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
 627         if (!el) {
 628                 talloc_free(tmp_ctx);
 629                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 630                                          "Error finding element for servicePrincipalName.");
 631         }
 632
 633         /* NTDSDSA objectGuid of object we are checking SPN for */
 634         if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
 635                 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
 636                                                              req->op.mod.message->dn, &ntds, req);
 637                 if (ret != LDB_SUCCESS) {
 638                         ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
 639                                                ldb_dn_get_linearized(req->op.mod.message->dn),
 640                                                ldb_strerror(ret));
 641                         talloc_free(tmp_ctx);
 642                         return LDB_ERR_OPERATIONS_ERROR;
 643                 }
 644                 ntds_guid = GUID_string(tmp_ctx, &ntds);
 645         }
 646
 647         for (i=0; i < el->num_values; i++) {
 648                 ret = acl_validate_spn_value(tmp_ctx,
 649                                              ldb,
 650                                              (char *)el->values[i].data,
 651                                              userAccountControl,
 652                                              samAccountName,
 653                                              dnsHostName,
 654                                              netbios_name,
 655                                              ntds_guid);
 656                 if (ret != LDB_SUCCESS) {
 657                         talloc_free(tmp_ctx);
 658                         return ret;
 659                 }
 660         }
 661         talloc_free(tmp_ctx);
 662         return LDB_SUCCESS;
 663 }
 664
 665 static int acl_add(struct ldb_module *module, struct ldb_request *req)
 666 {
 667         int ret;
 668         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
 669         struct ldb_context *ldb;
 670         const struct dsdb_schema *schema;
 671         struct ldb_message_element *oc_el;
 672         const struct GUID *guid;
 673         struct ldb_dn *nc_root;
 674         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 675
 676         if (as_system != NULL) {
 677                 as_system->critical = 0;
 678         }
 679
 680         if (dsdb_module_am_system(module) || as_system) {
 681                 return ldb_next_request(module, req);
 682         }
 683         if (ldb_dn_is_special(req->op.add.message->dn)) {
 684                 return ldb_next_request(module, req);
 685         }
 686
 687         ldb = ldb_module_get_ctx(module);
 688
 689         /* Creating an NC. There is probably something we should do here,
 690          * but we will establish that later */
 691
 692         ret = dsdb_find_nc_root(ldb, req, req->op.add.message->dn, &nc_root);
 693         if (ret != LDB_SUCCESS) {
 694                 return ret;
 695         }
 696         if (ldb_dn_compare(nc_root, req->op.add.message->dn) == 0) {
 697                 talloc_free(nc_root);
 698                 return ldb_next_request(module, req);
 699         }
 700         talloc_free(nc_root);
 701
 702         schema = dsdb_get_schema(ldb, req);
 703         if (!schema) {
 704                 return ldb_operr(ldb);
 705         }
 706
 707         oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
 708         if (!oc_el || oc_el->num_values == 0) {
 709                 DEBUG(10,("acl:operation error %s\n", ldb_dn_get_linearized(req->op.add.message->dn)));
 710                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 711         }
 712
 713         guid = class_schemaid_guid_by_lDAPDisplayName(schema,
 714                                                       (char *)oc_el->values[oc_el->num_values-1].data);
 715         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid, req);
 716         if (ret != LDB_SUCCESS) {
 717                 return ret;
 718         }
 719         return ldb_next_request(module, req);
 720 }
 721
 722 /* ckecks if modifications are allowed on "Member" attribute */
 723 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
 724                                      struct ldb_module *module,
 725                                      struct ldb_request *req,
 726                                      struct security_descriptor *sd,
 727                                      struct dom_sid *sid,
 728                                      const struct GUID *oc_guid,
 729                                      const struct dsdb_attribute *attr)
 730 {
 731         int ret;
 732         unsigned int i;
 733         struct ldb_context *ldb = ldb_module_get_ctx(module);
 734         struct ldb_dn *user_dn;
 735         struct ldb_message_element *member_el;
 736         /* if we have wp, we can do whatever we like */
 737         if (acl_check_access_on_attribute(module,
 738                                           mem_ctx,
 739                                           sd,
 740                                           sid,
 741                                           SEC_ADS_WRITE_PROP,
 742                                           attr) == LDB_SUCCESS) {
 743                 return LDB_SUCCESS;
 744         }
 745         /* if we are adding/deleting ourselves, check for self membership */
 746         ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
 747                                   &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
 748                                   &user_dn);
 749         if (ret != LDB_SUCCESS) {
 750                 return ret;
 751         }
 752         member_el = ldb_msg_find_element(req->op.mod.message, "member");
 753         if (!member_el) {
 754                 return ldb_operr(ldb);
 755         }
 756         /* user can only remove oneself */
 757         if (member_el->num_values == 0) {
 758                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 759         }
 760         for (i = 0; i < member_el->num_values; i++) {
 761                 if (strcasecmp((const char *)member_el->values[i].data,
 762                                ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
 763                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 764                 }
 765         }
 766         ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
 767                                        GUID_DRS_SELF_MEMBERSHIP,
 768                                        SEC_ADS_SELF_WRITE,
 769                                        sid);
 770         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 771                 dsdb_acl_debug(sd, acl_user_token(module),
 772                                req->op.mod.message->dn,
 773                                true,
 774                                10);
 775         }
 776         return ret;
 777 }
 778
 779 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
 780                                      struct ldb_module *module,
 781                                      struct ldb_request *req,
 782                                      struct security_descriptor *sd,
 783                                      struct dom_sid *sid,
 784                                      const struct GUID *oc_guid,
 785                                      bool userPassword)
 786 {
 787         int ret = LDB_SUCCESS;
 788         unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
 789         struct ldb_message_element *el;
 790         struct ldb_message *msg;
 791         const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
 792                                         "unicodePwd", "dBCSPwd", NULL }, **l;
 793         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 794
 795         msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
 796         if (msg == NULL) {
 797                 return ldb_module_oom(module);
 798         }
 799         for (l = passwordAttrs; *l != NULL; l++) {
 800                 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
 801                         continue;
 802                 }
 803
 804                 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
 805                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
 806                                 ++del_attr_cnt;
 807                         }
 808                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
 809                                 ++add_attr_cnt;
 810                         }
 811                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
 812                                 ++rep_attr_cnt;
 813                         }
 814                         ldb_msg_remove_element(msg, el);
 815                 }
 816         }
 817
 818         /* single deletes will be handled by the "password_hash" LDB module
 819          * later in the stack, so we let it though here */
 820         if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
 821                 talloc_free(tmp_ctx);
 822                 return LDB_SUCCESS;
 823         }
 824
 825         if (ldb_request_get_control(req,
 826                                     DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
 827                 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
 828                  * have a user password change and not a set as the message
 829                  * looks like. In it's value blob it contains the NT and/or LM
 830                  * hash of the old password specified by the user.
 831                  * This control is used by the SAMR and "kpasswd" password
 832                  * change mechanisms. */
 833                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 834                                                GUID_DRS_USER_CHANGE_PASSWORD,
 835                                                SEC_ADS_CONTROL_ACCESS,
 836                                                sid);
 837         }
 838         else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
 839                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 840                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
 841                                                SEC_ADS_CONTROL_ACCESS,
 842                                                sid);
 843         }
 844         else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
 845                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 846                                                GUID_DRS_USER_CHANGE_PASSWORD,
 847                                                SEC_ADS_CONTROL_ACCESS,
 848                                                sid);
 849                 /* Very strange, but we get constraint violation in this case */
 850                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 851                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
 852                 }
 853         }
 854         if (ret != LDB_SUCCESS) {
 855                 dsdb_acl_debug(sd, acl_user_token(module),
 856                                req->op.mod.message->dn,
 857                                true,
 858                                10);
 859         }
 860         talloc_free(tmp_ctx);
 861         return ret;
 862 }
 863
 864 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
 865 {
 866         int ret;
 867         struct ldb_context *ldb = ldb_module_get_ctx(module);
 868         const struct dsdb_schema *schema;
 869         unsigned int i;
 870         const struct GUID *guid;
 871         uint32_t access_granted;
 872         struct object_tree *root = NULL;
 873         struct object_tree *new_node = NULL;
 874         NTSTATUS status;
 875         struct ldb_result *acl_res;
 876         struct security_descriptor *sd;
 877         struct dom_sid *sid = NULL;
 878         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 879         bool userPassword = dsdb_user_password_support(module, req, req);
 880         TALLOC_CTX *tmp_ctx = talloc_new(req);
 881         static const char *acl_attrs[] = {
 882                 "nTSecurityDescriptor",
 883                 "objectClass",
 884                 "objectSid",
 885                 NULL
 886         };
 887
 888         if (as_system != NULL) {
 889                 as_system->critical = 0;
 890         }
 891
 892         /* Don't print this debug statement if elements[0].name is going to be NULL */
 893         if(req->op.mod.message->num_elements > 0)
 894         {
 895                 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
 896         }
 897         if (dsdb_module_am_system(module) || as_system) {
 898                 return ldb_next_request(module, req);
 899         }
 900         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 901                 return ldb_next_request(module, req);
 902         }
 903         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
 904                                     acl_attrs,
 905                                     DSDB_FLAG_NEXT_MODULE, req);
 906
 907         if (ret != LDB_SUCCESS) {
 908                 goto fail;
 909         }
 910
 911         schema = dsdb_get_schema(ldb, tmp_ctx);
 912         if (!schema) {
 913                 ret = LDB_ERR_OPERATIONS_ERROR;
 914                 goto fail;
 915         }
 916
 917         ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
 918         if (ret != LDB_SUCCESS) {
 919                 talloc_free(tmp_ctx);
 920                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 921                                  "acl_modify: Error retrieving security descriptor.");
 922         }
 923         /* Theoretically we pass the check if the object has no sd */
 924         if (!sd) {
 925                 goto success;
 926         }
 927
 928         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
 929         if (!guid) {
 930                 talloc_free(tmp_ctx);
 931                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 932                                  "acl_modify: Error retrieving object class GUID.");
 933         }
 934         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
 935         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 936                                    &root, &new_node)) {
 937                 talloc_free(tmp_ctx);
 938                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 939                                  "acl_modify: Error adding new node in object tree.");
 940         }
 941         for (i=0; i < req->op.mod.message->num_elements; i++){
 942                 const struct dsdb_attribute *attr;
 943                 attr = dsdb_attribute_by_lDAPDisplayName(schema,
 944                                                          req->op.mod.message->elements[i].name);
 945
 946                 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
 947                         status = sec_access_check_ds(sd, acl_user_token(module),
 948                                              SEC_STD_WRITE_DAC,
 949                                              &access_granted,
 950                                              NULL,
 951                                              sid);
 952
 953                         if (!NT_STATUS_IS_OK(status)) {
 954                                 DEBUG(10, ("Object %s has no write dacl access\n",
 955                                            ldb_dn_get_linearized(req->op.mod.message->dn)));
 956                                 dsdb_acl_debug(sd,
 957                                                acl_user_token(module),
 958                                                req->op.mod.message->dn,
 959                                                true,
 960                                                10);
 961                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 962                                 goto fail;
 963                         }
 964                 }
 965                 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
 966                         ret = acl_check_self_membership(tmp_ctx,
 967                                                         module,
 968                                                         req,
 969                                                         sd,
 970                                                         sid,
 971                                                         guid,
 972                                                         attr);
 973                         if (ret != LDB_SUCCESS) {
 974                                 goto fail;
 975                         }
 976                 }
 977                 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
 978                         /* this one is not affected by any rights, we should let it through
 979                            so that passwords_hash returns the correct error */
 980                         continue;
 981                 }
 982                 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
 983                          (userPassword && ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0) ||
 984                          ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
 985                         ret = acl_check_password_rights(tmp_ctx,
 986                                                         module,
 987                                                         req,
 988                                                         sd,
 989                                                         sid,
 990                                                         guid,
 991                                                         userPassword);
 992                         if (ret != LDB_SUCCESS) {
 993                                 goto fail;
 994                         }
 995                 } else if (ldb_attr_cmp("servicePrincipalName", req->op.mod.message->elements[i].name) == 0) {
 996                         ret = acl_check_spn(tmp_ctx,
 997                                             module,
 998                                             req,
 999                                             sd,
1000                                             sid,
1001                                             guid,
1002                                             attr);
1003                         if (ret != LDB_SUCCESS) {
1004                                 goto fail;
1005                         }
1006                 } else {
1007
1008                 /* This basic attribute existence check with the right errorcode
1009                  * is needed since this module is the first one which requests
1010                  * schema attribute information.
1011                  * The complete attribute checking is done in the
1012                  * "objectclass_attrs" module behind this one.
1013                  */
1014                         if (!attr) {
1015                                 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
1016                                                        req->op.mod.message->elements[i].name,
1017                                                ldb_dn_get_linearized(req->op.mod.message->dn));
1018                                 ret =  LDB_ERR_NO_SUCH_ATTRIBUTE;
1019                                 goto fail;
1020                         }
1021                         if (!insert_in_object_tree(tmp_ctx,
1022                                                    &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
1023                                                    &new_node, &new_node)) {
1024                                 DEBUG(10, ("acl_modify: cannot add to object tree securityGUID\n"));
1025                                 ret = LDB_ERR_OPERATIONS_ERROR;
1026                                 goto fail;
1027                         }
1028
1029                         if (!insert_in_object_tree(tmp_ctx,
1030                                                    &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
1031                                 DEBUG(10, ("acl_modify: cannot add to object tree attributeGUID\n"));
1032                                 ret = LDB_ERR_OPERATIONS_ERROR;
1033                                 goto fail;
1034                         }
1035                 }
1036         }
1037
1038         if (root->num_of_children > 0) {
1039                 status = sec_access_check_ds(sd, acl_user_token(module),
1040                                              SEC_ADS_WRITE_PROP,
1041                                              &access_granted,
1042                                              root,
1043                                              sid);
1044
1045                 if (!NT_STATUS_IS_OK(status)) {
1046                         DEBUG(10, ("Object %s has no write property access\n",
1047                                    ldb_dn_get_linearized(req->op.mod.message->dn)));
1048                         dsdb_acl_debug(sd,
1049                                   acl_user_token(module),
1050                                   req->op.mod.message->dn,
1051                                   true,
1052                                   10);
1053                         ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1054                         goto fail;
1055                 }
1056         }
1057
1058 success:
1059         talloc_free(tmp_ctx);
1060         return ldb_next_request(module, req);
1061 fail:
1062         talloc_free(tmp_ctx);
1063         return ret;
1064 }
1065
1066 /* similar to the modify for the time being.
1067  * We need to consider the special delete tree case, though - TODO */
1068 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1069 {
1070         int ret;
1071         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
1072         struct ldb_context *ldb;
1073         struct ldb_dn *nc_root;
1074         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1075
1076         if (as_system != NULL) {
1077                 as_system->critical = 0;
1078         }
1079
1080         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1081         if (dsdb_module_am_system(module) || as_system) {
1082                 return ldb_next_request(module, req);
1083         }
1084         if (ldb_dn_is_special(req->op.del.dn)) {
1085                 return ldb_next_request(module, req);
1086         }
1087
1088         ldb = ldb_module_get_ctx(module);
1089
1090         /* Make sure we aren't deleting a NC */
1091
1092         ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1093         if (ret != LDB_SUCCESS) {
1094                 return ret;
1095         }
1096         if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1097                 talloc_free(nc_root);
1098                 DEBUG(10,("acl:deleting a NC\n"));
1099                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1100                 return ldb_module_done(req, NULL, NULL,
1101                                        LDB_ERR_UNWILLING_TO_PERFORM);
1102         }
1103         talloc_free(nc_root);
1104
1105         /* First check if we have delete object right */
1106         ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn,
1107                                              SEC_STD_DELETE, NULL, req);
1108         if (ret == LDB_SUCCESS) {
1109                 return ldb_next_request(module, req);
1110         }
1111
1112         /* Nope, we don't have delete object. Lets check if we have delete
1113          * child on the parent */
1114         ret = dsdb_module_check_access_on_dn(module, req, parent,
1115                                              SEC_ADS_DELETE_CHILD, NULL, req);
1116         if (ret != LDB_SUCCESS) {
1117                 return ret;
1118         }
1119
1120         return ldb_next_request(module, req);
1121 }
1122
1123 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1124 {
1125         int ret;
1126         struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
1127         struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
1128         const struct dsdb_schema *schema;
1129         struct ldb_context *ldb;
1130         struct security_descriptor *sd = NULL;
1131         struct dom_sid *sid = NULL;
1132         struct ldb_result *acl_res;
1133         const struct GUID *guid;
1134         struct ldb_dn *nc_root;
1135         struct object_tree *root = NULL;
1136         struct object_tree *new_node = NULL;
1137         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1138         TALLOC_CTX *tmp_ctx = talloc_new(req);
1139         NTSTATUS status;
1140         uint32_t access_granted;
1141         const char *rdn_name;
1142         static const char *acl_attrs[] = {
1143                 "nTSecurityDescriptor",
1144                 "objectClass",
1145                 "objectSid",
1146                 NULL
1147         };
1148
1149         if (as_system != NULL) {
1150                 as_system->critical = 0;
1151         }
1152
1153         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1154         if (dsdb_module_am_system(module) || as_system) {
1155                 return ldb_next_request(module, req);
1156         }
1157         if (ldb_dn_is_special(req->op.rename.olddn)) {
1158                 return ldb_next_request(module, req);
1159         }
1160
1161         ldb = ldb_module_get_ctx(module);
1162
1163         /* Make sure we aren't renaming/moving a NC */
1164
1165         ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1166         if (ret != LDB_SUCCESS) {
1167                 return ret;
1168         }
1169         if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1170                 talloc_free(nc_root);
1171                 DEBUG(10,("acl:renaming/moving a NC\n"));
1172                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1173                 return ldb_module_done(req, NULL, NULL,
1174                                        LDB_ERR_UNWILLING_TO_PERFORM);
1175         }
1176         talloc_free(nc_root);
1177
1178         /* Look for the parent */
1179
1180         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1181                                     req->op.rename.olddn, acl_attrs,
1182                                     DSDB_FLAG_NEXT_MODULE |
1183                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1184         /* we sould be able to find the parent */
1185         if (ret != LDB_SUCCESS) {
1186                 DEBUG(10,("acl: failed to find object %s\n",
1187                           ldb_dn_get_linearized(req->op.rename.olddn)));
1188                 talloc_free(tmp_ctx);
1189                 return ret;
1190         }
1191
1192         schema = dsdb_get_schema(ldb, acl_res);
1193         if (!schema) {
1194                 talloc_free(tmp_ctx);
1195                 return ldb_operr(ldb);
1196         }
1197
1198         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1199         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1200                                    &root, &new_node)) {
1201                 talloc_free(tmp_ctx);
1202                 return ldb_operr(ldb);
1203         };
1204
1205         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1206                                                           "name");
1207         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1208                                    &new_node, &new_node)) {
1209                 talloc_free(tmp_ctx);
1210                 return ldb_operr(ldb);
1211         };
1212
1213         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1214         if (rdn_name == NULL) {
1215                 talloc_free(tmp_ctx);
1216                 return ldb_operr(ldb);
1217         }
1218         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1219                                                           rdn_name);
1220         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1221                                    &new_node, &new_node)) {
1222                 talloc_free(tmp_ctx);
1223                 return ldb_operr(ldb);
1224         };
1225
1226         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1227
1228         if (ret != LDB_SUCCESS) {
1229                 talloc_free(tmp_ctx);
1230                 return ldb_operr(ldb);
1231         }
1232         /* Theoretically we pass the check if the object has no sd */
1233         if (!sd) {
1234                 talloc_free(tmp_ctx);
1235                 return LDB_SUCCESS;
1236         }
1237         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1238         status = sec_access_check_ds(sd, acl_user_token(module),
1239                                      SEC_ADS_WRITE_PROP,
1240                                      &access_granted,
1241                                      root,
1242                                      sid);
1243
1244         if (!NT_STATUS_IS_OK(status)) {
1245                 DEBUG(10, ("Object %s has no wp on name\n",
1246                            ldb_dn_get_linearized(req->op.rename.olddn)));
1247                 dsdb_acl_debug(sd,
1248                           acl_user_token(module),
1249                           req->op.rename.olddn,
1250                           true,
1251                           10);
1252                 talloc_free(tmp_ctx);
1253                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1254         }
1255
1256         if (ldb_dn_compare(oldparent, newparent) == 0) {
1257                 /* regular rename, not move, nothing more to do */
1258                 talloc_free(tmp_ctx);
1259                 return ldb_next_request(module, req);
1260         }
1261
1262         /* new parent should have create child */
1263         root = NULL;
1264         new_node = NULL;
1265         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1266         if (!guid) {
1267                 DEBUG(10,("acl:renamed object has no object class\n"));
1268                 talloc_free(tmp_ctx);
1269                 return ldb_module_done(req, NULL, NULL,  LDB_ERR_OPERATIONS_ERROR);
1270         }
1271
1272         ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid, req);
1273         if (ret != LDB_SUCCESS) {
1274                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1275                 talloc_free(tmp_ctx);
1276                 return ret;
1277         }
1278         /* do we have delete object on the object? */
1279
1280         status = sec_access_check_ds(sd, acl_user_token(module),
1281                                      SEC_STD_DELETE,
1282                                      &access_granted,
1283                                      NULL,
1284                                      sid);
1285
1286         if (NT_STATUS_IS_OK(status)) {
1287                 talloc_free(tmp_ctx);
1288                 return ldb_next_request(module, req);
1289         }
1290         /* what about delete child on the current parent */
1291         ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL, req);
1292         if (ret != LDB_SUCCESS) {
1293                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1294                 talloc_free(tmp_ctx);
1295                 return ldb_module_done(req, NULL, NULL, ret);
1296         }
1297
1298         talloc_free(tmp_ctx);
1299
1300         return ldb_next_request(module, req);
1301 }
1302
1303 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1304 {
1305         struct ldb_context *ldb;
1306         struct acl_context *ac;
1307         struct acl_private *data;
1308         struct ldb_result *acl_res;
1309         static const char *acl_attrs[] = {
1310                 "objectClass",
1311                 "nTSecurityDescriptor",
1312                 "objectSid",
1313                 NULL
1314         };
1315         int ret;
1316         unsigned int i;
1317
1318         ac = talloc_get_type(req->context, struct acl_context);
1319         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1320         ldb = ldb_module_get_ctx(ac->module);
1321
1322         if (!ares) {
1323                 return ldb_module_done(ac->req, NULL, NULL,
1324                                        LDB_ERR_OPERATIONS_ERROR);
1325         }
1326         if (ares->error != LDB_SUCCESS) {
1327                 return ldb_module_done(ac->req, ares->controls,
1328                                        ares->response, ares->error);
1329         }
1330
1331         switch (ares->type) {
1332         case LDB_REPLY_ENTRY:
1333                 if (ac->allowedAttributes
1334                     || ac->allowedChildClasses
1335                     || ac->allowedChildClassesEffective
1336                     || ac->allowedAttributesEffective
1337                     || ac->sDRightsEffective) {
1338                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1339                                                     acl_attrs,
1340                                                     DSDB_FLAG_NEXT_MODULE, req);
1341                         if (ret != LDB_SUCCESS) {
1342                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1343                         }
1344                         if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1345                                 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1346                                 if (ret != LDB_SUCCESS) {
1347                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1348                                 }
1349                         }
1350                         if (ac->allowedChildClasses) {
1351                                 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1352                                                        ares->message, "allowedChildClasses");
1353                                 if (ret != LDB_SUCCESS) {
1354                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1355                                 }
1356                         }
1357                         if (ac->allowedChildClassesEffective) {
1358                                 ret = acl_childClassesEffective(ac->module, ac->schema,
1359                                                                 acl_res->msgs[0], ares->message, ac);
1360                                 if (ret != LDB_SUCCESS) {
1361                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1362                                 }
1363                         }
1364                         if (ac->sDRightsEffective) {
1365                                 ret = acl_sDRightsEffective(ac->module,
1366                                                             acl_res->msgs[0], ares->message, ac);
1367                                 if (ret != LDB_SUCCESS) {
1368                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1369                                 }
1370                         }
1371                 }
1372                 if (data && data->password_attrs) {
1373                         if (!ac->am_system) {
1374                                 for (i = 0; data->password_attrs[i]; i++) {
1375                                         if ((!ac->userPassword) &&
1376                                             (ldb_attr_cmp(data->password_attrs[i],
1377                                                           "userPassword") == 0))
1378                                                 continue;
1379
1380                                         ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1381                                 }
1382                         }
1383                 }
1384                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1385
1386         case LDB_REPLY_REFERRAL:
1387                 return ldb_module_send_referral(ac->req, ares->referral);
1388
1389         case LDB_REPLY_DONE:
1390                 return ldb_module_done(ac->req, ares->controls,
1391                                        ares->response, LDB_SUCCESS);
1392
1393         }
1394         return LDB_SUCCESS;
1395 }
1396
1397 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1398 {
1399         struct ldb_context *ldb;
1400         struct acl_context *ac;
1401         struct ldb_request *down_req;
1402         struct acl_private *data;
1403         int ret;
1404         unsigned int i;
1405
1406         ldb = ldb_module_get_ctx(module);
1407
1408         ac = talloc_zero(req, struct acl_context);
1409         if (ac == NULL) {
1410                 return ldb_oom(ldb);
1411         }
1412         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1413
1414         ac->module = module;
1415         ac->req = req;
1416         ac->am_system = dsdb_module_am_system(module);
1417         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1418         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1419         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1420         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1421         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1422         ac->userPassword = dsdb_user_password_support(module, ac, req);
1423         ac->schema = dsdb_get_schema(ldb, ac);
1424
1425         /* replace any attributes in the parse tree that are private,
1426            so we don't allow a search for 'userPassword=penguin',
1427            just as we would not allow that attribute to be returned */
1428         if (ac->am_system) {
1429                 /* FIXME: We should copy the tree and keep the original unmodified. */
1430                 /* remove password attributes */
1431                 if (data && data->password_attrs) {
1432                         for (i = 0; data->password_attrs[i]; i++) {
1433                                 if ((!ac->userPassword) &&
1434                                     (ldb_attr_cmp(data->password_attrs[i],
1435                                                   "userPassword") == 0))
1436                                                 continue;
1437
1438                                 ldb_parse_tree_attr_replace(req->op.search.tree,
1439                                                             data->password_attrs[i],
1440                                                             "kludgeACLredactedattribute");
1441                         }
1442                 }
1443         }
1444         ret = ldb_build_search_req_ex(&down_req,
1445                                       ldb, ac,
1446                                       req->op.search.base,
1447                                       req->op.search.scope,
1448                                       req->op.search.tree,
1449                                       req->op.search.attrs,
1450                                       req->controls,
1451                                       ac, acl_search_callback,
1452                                       req);
1453         LDB_REQ_SET_LOCATION(down_req);
1454         if (ret != LDB_SUCCESS) {
1455                 return ret;
1456         }
1457         /* perform the search */
1458         return ldb_next_request(module, down_req);
1459 }
1460
1461 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1462 {
1463         struct ldb_context *ldb = ldb_module_get_ctx(module);
1464         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1465
1466         /* allow everybody to read the sequence number */
1467         if (strcmp(req->op.extended.oid,
1468                    LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1469                 return ldb_next_request(module, req);
1470         }
1471
1472         if (dsdb_module_am_system(module) ||
1473             dsdb_module_am_administrator(module) || as_system) {
1474                 return ldb_next_request(module, req);
1475         } else {
1476                 ldb_asprintf_errstring(ldb,
1477                                        "acl_extended: "
1478                                        "attempted database modify not permitted. "
1479                                        "User %s is not SYSTEM or an administrator",
1480                                        acl_user_name(req, module));
1481                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1482         }
1483 }
1484
1485 static const struct ldb_module_ops ldb_acl_module_ops = {
1486         .name              = "acl",
1487         .search            = acl_search,
1488         .add               = acl_add,
1489         .modify            = acl_modify,
1490         .del               = acl_delete,
1491         .rename            = acl_rename,
1492         .extended          = acl_extended,
1493         .init_context      = acl_module_init
1494 };
1495
1496 int ldb_acl_module_init(const char *version)
1497 {
1498         LDB_MODULE_CHECK_VERSION(version);
1499         return ldb_register_module(&ldb_acl_module_ops);
1500 }