source4/dsdb/samdb/ldb_modules/acl.c

   1 /*
   2   ldb database library
   3
   4   Copyright (C) Simo Sorce 2006-2008
   5   Copyright (C) Nadezhda Ivanova 2009
   6   Copyright (C) Anatoliy Atanasov  2009
   7
   8   This program is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 3 of the License, or
  11   (at your option) any later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 /*
  23  *  Name: ldb
  24  *
  25  *  Component: ldb ACL module
  26  *
  27  *  Description: Module that performs authorisation access checks based on the
  28  *               account's security context and the DACL of the object being polled.
  29  *               Only DACL checks implemented at this point
  30  *
  31  *  Authors: Nadezhda Ivanova, Anatoliy Atanasov
  32  */
  33
  34 #include "includes.h"
  35 #include "ldb_module.h"
  36 #include "auth/auth.h"
  37 #include "libcli/security/security.h"
  38 #include "dsdb/samdb/samdb.h"
  39 #include "librpc/gen_ndr/ndr_security.h"
  40 #include "param/param.h"
  41 #include "dsdb/samdb/ldb_modules/util.h"
  42 #include "lib/util/tsort.h"
  43 #include "system/kerberos.h"
  44 #include "auth/kerberos/kerberos.h"
  45
  46 #undef strcasecmp
  47 #undef strncasecmp
  48
  49 struct extended_access_check_attribute {
  50         const char *oa_name;
  51         const uint32_t requires_rights;
  52 };
  53
  54 struct acl_private {
  55         bool acl_search;
  56         const char **password_attrs;
  57         void *cached_schema_ptr;
  58         uint64_t cached_schema_metadata_usn;
  59         uint64_t cached_schema_loaded_usn;
  60         const char **confidential_attrs;
  61         bool userPassword_support;
  62 };
  63
  64 struct acl_context {
  65         struct ldb_module *module;
  66         struct ldb_request *req;
  67         bool am_system;
  68         bool am_administrator;
  69         bool modify_search;
  70         bool constructed_attrs;
  71         bool allowedAttributes;
  72         bool allowedAttributesEffective;
  73         bool allowedChildClasses;
  74         bool allowedChildClassesEffective;
  75         bool sDRightsEffective;
  76         bool userPassword;
  77         const char * const *attrs;
  78         struct dsdb_schema *schema;
  79 };
  80
  81 static int acl_module_init(struct ldb_module *module)
  82 {
  83         struct ldb_context *ldb;
  84         struct acl_private *data;
  85         int ret;
  86         unsigned int i, n, j;
  87         TALLOC_CTX *mem_ctx;
  88         static const char * const attrs[] = { "passwordAttribute", NULL };
  89         static const char * const secret_attrs[] = {
  90                 DSDB_SECRET_ATTRIBUTES
  91         };
  92         struct ldb_result *res;
  93         struct ldb_message *msg;
  94         struct ldb_message_element *password_attributes;
  95
  96         ldb = ldb_module_get_ctx(module);
  97
  98         ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
  99         if (ret != LDB_SUCCESS) {
 100                 ldb_debug(ldb, LDB_DEBUG_ERROR,
 101                           "acl_module_init: Unable to register control with rootdse!\n");
 102                 return ldb_operr(ldb);
 103         }
 104
 105         data = talloc_zero(module, struct acl_private);
 106         if (data == NULL) {
 107                 return ldb_oom(ldb);
 108         }
 109
 110         data->acl_search = lpcfg_parm_bool(ldb_get_opaque(ldb, "loadparm"),
 111                                         NULL, "acl", "search", true);
 112         ldb_module_set_private(module, data);
 113
 114         mem_ctx = talloc_new(module);
 115         if (!mem_ctx) {
 116                 return ldb_oom(ldb);
 117         }
 118
 119         ret = dsdb_module_search_dn(module, mem_ctx, &res,
 120                                     ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
 121                                     attrs,
 122                                     DSDB_FLAG_NEXT_MODULE |
 123                                     DSDB_FLAG_AS_SYSTEM,
 124                                     NULL);
 125         if (ret != LDB_SUCCESS) {
 126                 goto done;
 127         }
 128         if (res->count == 0) {
 129                 goto done;
 130         }
 131
 132         if (res->count > 1) {
 133                 talloc_free(mem_ctx);
 134                 return LDB_ERR_CONSTRAINT_VIOLATION;
 135         }
 136
 137         msg = res->msgs[0];
 138
 139         password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
 140         if (!password_attributes) {
 141                 goto done;
 142         }
 143         data->password_attrs = talloc_array(data, const char *,
 144                         password_attributes->num_values +
 145                         ARRAY_SIZE(secret_attrs) + 1);
 146         if (!data->password_attrs) {
 147                 talloc_free(mem_ctx);
 148                 return ldb_oom(ldb);
 149         }
 150
 151         n = 0;
 152         for (i=0; i < password_attributes->num_values; i++) {
 153                 data->password_attrs[n] = (const char *)password_attributes->values[i].data;
 154                 talloc_steal(data->password_attrs, password_attributes->values[i].data);
 155                 n++;
 156         }
 157
 158         for (i=0; i < ARRAY_SIZE(secret_attrs); i++) {
 159                 bool found = false;
 160
 161                 for (j=0; j < n; j++) {
 162                         if (strcasecmp(data->password_attrs[j], secret_attrs[i]) == 0) {
 163                                 found = true;
 164                                 break;
 165                         }
 166                 }
 167
 168                 if (found) {
 169                         continue;
 170                 }
 171
 172                 data->password_attrs[n] = talloc_strdup(data->password_attrs,
 173                                                         secret_attrs[i]);
 174                 if (data->password_attrs[n] == NULL) {
 175                         talloc_free(mem_ctx);
 176                         return ldb_oom(ldb);
 177                 }
 178                 n++;
 179         }
 180         data->password_attrs[n] = NULL;
 181
 182 done:
 183         talloc_free(mem_ctx);
 184         ret = ldb_next_init(module);
 185
 186         if (ret != LDB_SUCCESS) {
 187                 return ret;
 188         }
 189
 190         /*
 191          * Check this after the modules have be initialised so we
 192          * can actually read the backend DB.
 193          */
 194         data->userPassword_support
 195                 = dsdb_user_password_support(module,
 196                                              module,
 197                                              NULL);
 198         return ret;
 199 }
 200
 201 static int acl_allowedAttributes(struct ldb_module *module,
 202                                  const struct dsdb_schema *schema,
 203                                  struct ldb_message *sd_msg,
 204                                  struct ldb_message *msg,
 205                                  struct acl_context *ac)
 206 {
 207         struct ldb_message_element *oc_el;
 208         struct ldb_context *ldb = ldb_module_get_ctx(module);
 209         TALLOC_CTX *mem_ctx;
 210         const char **attr_list;
 211         int i, ret;
 212         const struct dsdb_class *objectclass;
 213
 214         /* If we don't have a schema yet, we can't do anything... */
 215         if (schema == NULL) {
 216                 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 217                 return LDB_ERR_OPERATIONS_ERROR;
 218         }
 219
 220         /* Must remove any existing attribute */
 221         if (ac->allowedAttributes) {
 222                 ldb_msg_remove_attr(msg, "allowedAttributes");
 223         }
 224
 225         mem_ctx = talloc_new(msg);
 226         if (!mem_ctx) {
 227                 return ldb_oom(ldb);
 228         }
 229
 230         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 231         attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
 232         if (!attr_list) {
 233                 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
 234                 talloc_free(mem_ctx);
 235                 return LDB_ERR_OPERATIONS_ERROR;
 236         }
 237
 238         /*
 239          * Get the top-most structural object class for the ACL check
 240          */
 241         objectclass = dsdb_get_last_structural_class(ac->schema,
 242                                                      oc_el);
 243         if (objectclass == NULL) {
 244                 ldb_asprintf_errstring(ldb, "acl_read: Failed to find a structural class for %s",
 245                                        ldb_dn_get_linearized(sd_msg->dn));
 246                 talloc_free(mem_ctx);
 247                 return LDB_ERR_OPERATIONS_ERROR;
 248         }
 249
 250         if (ac->allowedAttributes) {
 251                 for (i=0; attr_list && attr_list[i]; i++) {
 252                         ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
 253                 }
 254         }
 255         if (ac->allowedAttributesEffective) {
 256                 struct security_descriptor *sd;
 257                 struct dom_sid *sid = NULL;
 258                 struct ldb_control *as_system = ldb_request_get_control(ac->req,
 259                                                                         LDB_CONTROL_AS_SYSTEM_OID);
 260
 261                 if (as_system != NULL) {
 262                         as_system->critical = 0;
 263                 }
 264
 265                 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
 266                 if (ac->am_system || as_system) {
 267                         for (i=0; attr_list && attr_list[i]; i++) {
 268                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 269                         }
 270                         return LDB_SUCCESS;
 271                 }
 272
 273                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), mem_ctx, sd_msg, &sd);
 274
 275                 if (ret != LDB_SUCCESS) {
 276                         return ret;
 277                 }
 278
 279                 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
 280                 for (i=0; attr_list && attr_list[i]; i++) {
 281                         const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
 282                                                                                         attr_list[i]);
 283                         if (!attr) {
 284                                 return ldb_operr(ldb);
 285                         }
 286                         /* remove constructed attributes */
 287                         if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
 288                             || attr->systemOnly
 289                             || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
 290                                 continue;
 291                         }
 292                         ret = acl_check_access_on_attribute(module,
 293                                                             msg,
 294                                                             sd,
 295                                                             sid,
 296                                                             SEC_ADS_WRITE_PROP,
 297                                                             attr,
 298                                                             objectclass);
 299                         if (ret == LDB_SUCCESS) {
 300                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 301                         }
 302                 }
 303         }
 304         return LDB_SUCCESS;
 305 }
 306
 307 static int acl_childClasses(struct ldb_module *module,
 308                             const struct dsdb_schema *schema,
 309                             struct ldb_message *sd_msg,
 310                             struct ldb_message *msg,
 311                             const char *attrName)
 312 {
 313         struct ldb_message_element *oc_el;
 314         struct ldb_message_element *allowedClasses;
 315         const struct dsdb_class *sclass;
 316         unsigned int i, j;
 317         int ret;
 318
 319         /* If we don't have a schema yet, we can't do anything... */
 320         if (schema == NULL) {
 321                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 322                 return LDB_ERR_OPERATIONS_ERROR;
 323         }
 324
 325         /* Must remove any existing attribute, or else confusion reins */
 326         ldb_msg_remove_attr(msg, attrName);
 327         ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
 328         if (ret != LDB_SUCCESS) {
 329                 return ret;
 330         }
 331
 332         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 333
 334         for (i=0; oc_el && i < oc_el->num_values; i++) {
 335                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 336                 if (!sclass) {
 337                         /* We don't know this class?  what is going on? */
 338                         continue;
 339                 }
 340
 341                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 342                         ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
 343                 }
 344         }
 345         if (allowedClasses->num_values > 1) {
 346                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 347                 for (i=1 ; i < allowedClasses->num_values; i++) {
 348                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 349                         struct ldb_val *val2 = &allowedClasses->values[i];
 350                         if (data_blob_cmp(val1, val2) == 0) {
 351                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
 352                                 allowedClasses->num_values--;
 353                                 i--;
 354                         }
 355                 }
 356         }
 357
 358         return LDB_SUCCESS;
 359 }
 360
 361 static int acl_childClassesEffective(struct ldb_module *module,
 362                                      const struct dsdb_schema *schema,
 363                                      struct ldb_message *sd_msg,
 364                                      struct ldb_message *msg,
 365                                      struct acl_context *ac)
 366 {
 367         struct ldb_message_element *oc_el;
 368         struct ldb_message_element *allowedClasses = NULL;
 369         const struct dsdb_class *sclass;
 370         struct security_descriptor *sd;
 371         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 372                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 373         struct dom_sid *sid = NULL;
 374         unsigned int i, j;
 375         int ret;
 376
 377         if (as_system != NULL) {
 378                 as_system->critical = 0;
 379         }
 380
 381         if (ac->am_system || as_system) {
 382                 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
 383         }
 384
 385         /* If we don't have a schema yet, we can't do anything... */
 386         if (schema == NULL) {
 387                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 388                 return LDB_ERR_OPERATIONS_ERROR;
 389         }
 390
 391         /* Must remove any existing attribute, or else confusion reins */
 392         ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
 393
 394         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 395         ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 396         if (ret != LDB_SUCCESS) {
 397                 return ret;
 398         }
 399
 400         sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 401         for (i=0; oc_el && i < oc_el->num_values; i++) {
 402                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 403                 if (!sclass) {
 404                         /* We don't know this class?  what is going on? */
 405                         continue;
 406                 }
 407
 408                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 409                         const struct dsdb_class *sc;
 410
 411                         sc = dsdb_class_by_lDAPDisplayName(schema,
 412                                                            sclass->possibleInferiors[j]);
 413                         if (!sc) {
 414                                 /* We don't know this class?  what is going on? */
 415                                 continue;
 416                         }
 417
 418                         ret = acl_check_access_on_objectclass(module, ac,
 419                                                               sd, sid,
 420                                                               SEC_ADS_CREATE_CHILD,
 421                                                               sc);
 422                         if (ret == LDB_SUCCESS) {
 423                                 ldb_msg_add_string(msg, "allowedChildClassesEffective",
 424                                                    sclass->possibleInferiors[j]);
 425                         }
 426                 }
 427         }
 428         allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
 429         if (!allowedClasses) {
 430                 return LDB_SUCCESS;
 431         }
 432
 433         if (allowedClasses->num_values > 1) {
 434                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 435                 for (i=1 ; i < allowedClasses->num_values; i++) {
 436                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 437                         struct ldb_val *val2 = &allowedClasses->values[i];
 438                         if (data_blob_cmp(val1, val2) == 0) {
 439                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
 440                                 allowedClasses->num_values--;
 441                                 i--;
 442                         }
 443                 }
 444         }
 445         return LDB_SUCCESS;
 446 }
 447
 448 static int acl_sDRightsEffective(struct ldb_module *module,
 449                                  struct ldb_message *sd_msg,
 450                                  struct ldb_message *msg,
 451                                  struct acl_context *ac)
 452 {
 453         struct ldb_context *ldb = ldb_module_get_ctx(module);
 454         struct ldb_message_element *rightsEffective;
 455         int ret;
 456         struct security_descriptor *sd;
 457         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 458                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 459         struct dom_sid *sid = NULL;
 460         uint32_t flags = 0;
 461
 462         if (as_system != NULL) {
 463                 as_system->critical = 0;
 464         }
 465
 466         /* Must remove any existing attribute, or else confusion reins */
 467         ldb_msg_remove_attr(msg, "sDRightsEffective");
 468         ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
 469         if (ret != LDB_SUCCESS) {
 470                 return ret;
 471         }
 472         if (ac->am_system || as_system) {
 473                 flags = SECINFO_OWNER | SECINFO_GROUP |  SECINFO_SACL |  SECINFO_DACL;
 474         } else {
 475                 const struct dsdb_class *objectclass;
 476                 const struct dsdb_attribute *attr;
 477
 478                 objectclass = dsdb_get_structural_oc_from_msg(ac->schema, sd_msg);
 479                 if (objectclass == NULL) {
 480                         return ldb_operr(ldb);
 481                 }
 482
 483                 attr = dsdb_attribute_by_lDAPDisplayName(ac->schema,
 484                                                          "nTSecurityDescriptor");
 485                 if (attr == NULL) {
 486                         return ldb_operr(ldb);
 487                 }
 488
 489                 /* Get the security descriptor from the message */
 490                 ret = dsdb_get_sd_from_ldb_message(ldb, msg, sd_msg, &sd);
 491                 if (ret != LDB_SUCCESS) {
 492                         return ret;
 493                 }
 494                 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 495                 ret = acl_check_access_on_attribute(module,
 496                                                     msg,
 497                                                     sd,
 498                                                     sid,
 499                                                     SEC_STD_WRITE_OWNER,
 500                                                     attr,
 501                                                     objectclass);
 502                 if (ret == LDB_SUCCESS) {
 503                         flags |= SECINFO_OWNER | SECINFO_GROUP;
 504                 }
 505                 ret = acl_check_access_on_attribute(module,
 506                                                     msg,
 507                                                     sd,
 508                                                     sid,
 509                                                     SEC_STD_WRITE_DAC,
 510                                                     attr,
 511                                                     objectclass);
 512                 if (ret == LDB_SUCCESS) {
 513                         flags |= SECINFO_DACL;
 514                 }
 515                 ret = acl_check_access_on_attribute(module,
 516                                                     msg,
 517                                                     sd,
 518                                                     sid,
 519                                                     SEC_FLAG_SYSTEM_SECURITY,
 520                                                     attr,
 521                                                     objectclass);
 522                 if (ret == LDB_SUCCESS) {
 523                         flags |= SECINFO_SACL;
 524                 }
 525         }
 526         return samdb_msg_add_uint(ldb_module_get_ctx(module), msg, msg,
 527                                   "sDRightsEffective", flags);
 528 }
 529
 530 static int acl_validate_spn_value(TALLOC_CTX *mem_ctx,
 531                                   struct ldb_context *ldb,
 532                                   const char *spn_value,
 533                                   uint32_t userAccountControl,
 534                                   const char *samAccountName,
 535                                   const char *dnsHostName,
 536                                   const char *netbios_name,
 537                                   const char *ntds_guid)
 538 {
 539         int ret, princ_size;
 540         krb5_context krb_ctx;
 541         krb5_error_code kerr;
 542         krb5_principal principal;
 543         char *instanceName;
 544         char *serviceType;
 545         char *serviceName;
 546         const char *forest_name = samdb_forest_name(ldb, mem_ctx);
 547         const char *base_domain = samdb_default_domain_name(ldb, mem_ctx);
 548         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
 549                                                           struct loadparm_context);
 550         bool is_dc = (userAccountControl & UF_SERVER_TRUST_ACCOUNT) ||
 551                 (userAccountControl & UF_PARTIAL_SECRETS_ACCOUNT);
 552
 553         if (strcasecmp_m(spn_value, samAccountName) == 0) {
 554                 /* MacOS X sets this value, and setting an SPN of your
 555                  * own samAccountName is both pointless and safe */
 556                 return LDB_SUCCESS;
 557         }
 558
 559         kerr = smb_krb5_init_context_basic(mem_ctx,
 560                                            lp_ctx,
 561                                            &krb_ctx);
 562         if (kerr != 0) {
 563                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 564                                  "Could not initialize kerberos context.");
 565         }
 566
 567         ret = krb5_parse_name(krb_ctx, spn_value, &principal);
 568         if (ret) {
 569                 krb5_free_context(krb_ctx);
 570                 return LDB_ERR_CONSTRAINT_VIOLATION;
 571         }
 572
 573         princ_size = krb5_princ_size(krb_ctx, principal);
 574         if (princ_size < 2) {
 575                 DBG_WARNING("princ_size=%d\n", princ_size);
 576                 goto fail;
 577         }
 578
 579         instanceName = smb_krb5_principal_get_comp_string(mem_ctx, krb_ctx,
 580                                                           principal, 1);
 581         serviceType = smb_krb5_principal_get_comp_string(mem_ctx, krb_ctx,
 582                                                          principal, 0);
 583         if (krb5_princ_size(krb_ctx, principal) == 3) {
 584                 serviceName = smb_krb5_principal_get_comp_string(mem_ctx, krb_ctx,
 585                                                                  principal, 2);
 586         } else {
 587                 serviceName = NULL;
 588         }
 589
 590         if (serviceName) {
 591                 if (!is_dc) {
 592                         DBG_WARNING("is_dc=false, serviceName=%s,"
 593                                     "serviceType=%s\n", serviceName,
 594                                   serviceType);
 595                         goto fail;
 596                 }
 597                 if (strcasecmp(serviceType, "ldap") == 0) {
 598                         if (strcasecmp(serviceName, netbios_name) != 0 &&
 599                             strcasecmp(serviceName, forest_name) != 0) {
 600                                 DBG_WARNING("serviceName=%s\n", serviceName);
 601                                 goto fail;
 602                         }
 603
 604                 } else if (strcasecmp(serviceType, "gc") == 0) {
 605                         if (strcasecmp(serviceName, forest_name) != 0) {
 606                                 DBG_WARNING("serviceName=%s\n", serviceName);
 607                                 goto fail;
 608                         }
 609                 } else {
 610                         if (strcasecmp(serviceName, base_domain) != 0 &&
 611                             strcasecmp(serviceName, netbios_name) != 0) {
 612                                 DBG_WARNING("serviceType=%s, "
 613                                             "serviceName=%s\n",
 614                                             serviceType, serviceName);
 615                                 goto fail;
 616                         }
 617                 }
 618         }
 619         /* instanceName can be samAccountName without $ or dnsHostName
 620          * or "ntds_guid._msdcs.forest_domain for DC objects */
 621         if (strlen(instanceName) == (strlen(samAccountName) - 1)
 622             && strncasecmp(instanceName, samAccountName,
 623                            strlen(samAccountName) - 1) == 0) {
 624                 goto success;
 625         }
 626         if ((dnsHostName != NULL) &&
 627             (strcasecmp(instanceName, dnsHostName) == 0)) {
 628                 goto success;
 629         }
 630         if (is_dc) {
 631                 const char *guid_str;
 632                 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
 633                                            ntds_guid,
 634                                            forest_name);
 635                 if (strcasecmp(instanceName, guid_str) == 0) {
 636                         goto success;
 637                 }
 638         }
 639
 640 fail:
 641         krb5_free_principal(krb_ctx, principal);
 642         krb5_free_context(krb_ctx);
 643         ldb_debug_set(ldb, LDB_DEBUG_WARNING,
 644                       "acl: spn validation failed for "
 645                       "spn[%s] uac[0x%x] account[%s] hostname[%s] "
 646                       "nbname[%s] ntds[%s] forest[%s] domain[%s]\n",
 647                       spn_value, (unsigned)userAccountControl,
 648                       samAccountName, dnsHostName,
 649                       netbios_name, ntds_guid,
 650                       forest_name, base_domain);
 651         return LDB_ERR_CONSTRAINT_VIOLATION;
 652
 653 success:
 654         krb5_free_principal(krb_ctx, principal);
 655         krb5_free_context(krb_ctx);
 656         return LDB_SUCCESS;
 657 }
 658
 659 /*
 660  * Passing in 'el' is critical, we want to check all the values.
 661  *
 662  */
 663 static int acl_check_spn(TALLOC_CTX *mem_ctx,
 664                          struct ldb_module *module,
 665                          struct ldb_request *req,
 666                          const struct ldb_message_element *el,
 667                          struct security_descriptor *sd,
 668                          struct dom_sid *sid,
 669                          const struct dsdb_attribute *attr,
 670                          const struct dsdb_class *objectclass)
 671 {
 672         int ret;
 673         unsigned int i;
 674         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 675         struct ldb_context *ldb = ldb_module_get_ctx(module);
 676         struct ldb_result *acl_res;
 677         struct ldb_result *netbios_res;
 678         struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
 679         uint32_t userAccountControl;
 680         const char *samAccountName;
 681         const char *dnsHostName;
 682         const char *netbios_name;
 683         struct GUID ntds;
 684         char *ntds_guid = NULL;
 685
 686         static const char *acl_attrs[] = {
 687                 "samAccountName",
 688                 "dnsHostName",
 689                 "userAccountControl",
 690                 NULL
 691         };
 692         static const char *netbios_attrs[] = {
 693                 "nETBIOSName",
 694                 NULL
 695         };
 696
 697         /* if we have wp, we can do whatever we like */
 698         if (acl_check_access_on_attribute(module,
 699                                           tmp_ctx,
 700                                           sd,
 701                                           sid,
 702                                           SEC_ADS_WRITE_PROP,
 703                                           attr, objectclass) == LDB_SUCCESS) {
 704                 talloc_free(tmp_ctx);
 705                 return LDB_SUCCESS;
 706         }
 707
 708         ret = acl_check_extended_right(tmp_ctx,
 709                                        module,
 710                                        req,
 711                                        objectclass,
 712                                        sd,
 713                                        acl_user_token(module),
 714                                        GUID_DRS_VALIDATE_SPN,
 715                                        SEC_ADS_SELF_WRITE,
 716                                        sid);
 717
 718         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 719                 dsdb_acl_debug(sd, acl_user_token(module),
 720                                req->op.mod.message->dn,
 721                                true,
 722                                10);
 723                 talloc_free(tmp_ctx);
 724                 return ret;
 725         }
 726
 727         /*
 728          * If we have "validated write spn", allow delete of any
 729          * existing value (this keeps constrained delete to the same
 730          * rules as unconstrained)
 731          */
 732         if (req->operation == LDB_MODIFY) {
 733                 /*
 734                  * If not add or replace (eg delete),
 735                  * return success
 736                  */
 737                 if ((el->flags
 738                      & (LDB_FLAG_MOD_ADD|LDB_FLAG_MOD_REPLACE)) == 0) {
 739                         talloc_free(tmp_ctx);
 740                         return LDB_SUCCESS;
 741                 }
 742         }
 743
 744         ret = dsdb_module_search_dn(module, tmp_ctx,
 745                                     &acl_res, req->op.mod.message->dn,
 746                                     acl_attrs,
 747                                     DSDB_FLAG_NEXT_MODULE |
 748                                     DSDB_FLAG_AS_SYSTEM |
 749                                     DSDB_SEARCH_SHOW_RECYCLED,
 750                                     req);
 751         if (ret != LDB_SUCCESS) {
 752                 talloc_free(tmp_ctx);
 753                 return ret;
 754         }
 755
 756         userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
 757         dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
 758         samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
 759
 760         ret = dsdb_module_search(module, tmp_ctx,
 761                                  &netbios_res, partitions_dn,
 762                                  LDB_SCOPE_ONELEVEL,
 763                                  netbios_attrs,
 764                                  DSDB_FLAG_NEXT_MODULE |
 765                                  DSDB_FLAG_AS_SYSTEM,
 766                                  req,
 767                                  "(ncName=%s)",
 768                                  ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
 769
 770         netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
 771
 772         /* NTDSDSA objectGuid of object we are checking SPN for */
 773         if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
 774                 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
 775                                                              req->op.mod.message->dn, &ntds, req);
 776                 if (ret != LDB_SUCCESS) {
 777                         ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
 778                                                ldb_dn_get_linearized(req->op.mod.message->dn),
 779                                                ldb_strerror(ret));
 780                         talloc_free(tmp_ctx);
 781                         return LDB_ERR_OPERATIONS_ERROR;
 782                 }
 783                 ntds_guid = GUID_string(tmp_ctx, &ntds);
 784         }
 785
 786         for (i=0; i < el->num_values; i++) {
 787                 ret = acl_validate_spn_value(tmp_ctx,
 788                                              ldb,
 789                                              (char *)el->values[i].data,
 790                                              userAccountControl,
 791                                              samAccountName,
 792                                              dnsHostName,
 793                                              netbios_name,
 794                                              ntds_guid);
 795                 if (ret != LDB_SUCCESS) {
 796                         talloc_free(tmp_ctx);
 797                         return ret;
 798                 }
 799         }
 800         talloc_free(tmp_ctx);
 801         return LDB_SUCCESS;
 802 }
 803
 804 static int acl_add(struct ldb_module *module, struct ldb_request *req)
 805 {
 806         int ret;
 807         struct ldb_dn *parent;
 808         struct ldb_context *ldb;
 809         const struct dsdb_schema *schema;
 810         const struct dsdb_class *objectclass;
 811         struct ldb_control *as_system;
 812         struct ldb_message_element *el;
 813         unsigned int instanceType = 0;
 814
 815         if (ldb_dn_is_special(req->op.add.message->dn)) {
 816                 return ldb_next_request(module, req);
 817         }
 818
 819         as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 820         if (as_system != NULL) {
 821                 as_system->critical = 0;
 822         }
 823
 824         if (dsdb_module_am_system(module) || as_system) {
 825                 return ldb_next_request(module, req);
 826         }
 827
 828         ldb = ldb_module_get_ctx(module);
 829
 830         parent = ldb_dn_get_parent(req, req->op.add.message->dn);
 831         if (parent == NULL) {
 832                 return ldb_oom(ldb);
 833         }
 834
 835         schema = dsdb_get_schema(ldb, req);
 836         if (!schema) {
 837                 return ldb_operr(ldb);
 838         }
 839
 840         objectclass = dsdb_get_structural_oc_from_msg(schema, req->op.add.message);
 841         if (!objectclass) {
 842                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
 843                                        "acl: unable to find or validate structural objectClass on %s\n",
 844                                        ldb_dn_get_linearized(req->op.add.message->dn));
 845                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 846         }
 847
 848         el = ldb_msg_find_element(req->op.add.message, "instanceType");
 849         if ((el != NULL) && (el->num_values != 1)) {
 850                 ldb_set_errstring(ldb, "acl: the 'instanceType' attribute is single-valued!");
 851                 return LDB_ERR_UNWILLING_TO_PERFORM;
 852         }
 853
 854         instanceType = ldb_msg_find_attr_as_uint(req->op.add.message,
 855                                                  "instanceType", 0);
 856         if (instanceType & INSTANCE_TYPE_IS_NC_HEAD) {
 857                 static const char *no_attrs[] = { NULL };
 858                 struct ldb_result *partition_res;
 859                 struct ldb_dn *partitions_dn;
 860
 861                 partitions_dn = samdb_partitions_dn(ldb, req);
 862                 if (!partitions_dn) {
 863                         ldb_set_errstring(ldb, "acl: CN=partitions dn could not be generated!");
 864                         return LDB_ERR_UNWILLING_TO_PERFORM;
 865                 }
 866
 867                 ret = dsdb_module_search(module, req, &partition_res,
 868                                          partitions_dn, LDB_SCOPE_ONELEVEL,
 869                                          no_attrs,
 870                                          DSDB_FLAG_NEXT_MODULE |
 871                                          DSDB_FLAG_AS_SYSTEM |
 872                                          DSDB_SEARCH_ONE_ONLY |
 873                                          DSDB_SEARCH_SHOW_RECYCLED,
 874                                          req,
 875                                          "(&(nCName=%s)(objectClass=crossRef))",
 876                                          ldb_dn_get_linearized(req->op.add.message->dn));
 877
 878                 if (ret == LDB_SUCCESS) {
 879                         /* Check that we can write to the crossRef object MS-ADTS 3.1.1.5.2.8.2 */
 880                         ret = dsdb_module_check_access_on_dn(module, req, partition_res->msgs[0]->dn,
 881                                                              SEC_ADS_WRITE_PROP,
 882                                                              &objectclass->schemaIDGUID, req);
 883                         if (ret != LDB_SUCCESS) {
 884                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
 885                                                        "acl: ACL check failed on crossRef object %s: %s\n",
 886                                                        ldb_dn_get_linearized(partition_res->msgs[0]->dn),
 887                                                        ldb_errstring(ldb));
 888                                 return ret;
 889                         }
 890
 891                         /*
 892                          * TODO: Remaining checks, like if we are
 893                          * the naming master etc need to be handled
 894                          * in the instanceType module
 895                          */
 896                         return ldb_next_request(module, req);
 897                 }
 898
 899                 /* Check that we can create a crossRef object MS-ADTS 3.1.1.5.2.8.2 */
 900                 ret = dsdb_module_check_access_on_dn(module, req, partitions_dn,
 901                                                      SEC_ADS_CREATE_CHILD,
 902                                                      &objectclass->schemaIDGUID, req);
 903                 if (ret == LDB_ERR_NO_SUCH_OBJECT &&
 904                     ldb_request_get_control(req, LDB_CONTROL_RELAX_OID))
 905                 {
 906                         /* Allow provision bootstrap */
 907                         ret = LDB_SUCCESS;
 908                 }
 909                 if (ret != LDB_SUCCESS) {
 910                         ldb_asprintf_errstring(ldb_module_get_ctx(module),
 911                                                "acl: ACL check failed on CN=Partitions crossRef container %s: %s\n",
 912                                                ldb_dn_get_linearized(partitions_dn), ldb_errstring(ldb));
 913                         return ret;
 914                 }
 915
 916                 /*
 917                  * TODO: Remaining checks, like if we are the naming
 918                  * master and adding the crossRef object need to be
 919                  * handled in the instanceType module
 920                  */
 921                 return ldb_next_request(module, req);
 922         }
 923
 924         ret = dsdb_module_check_access_on_dn(module, req, parent,
 925                                              SEC_ADS_CREATE_CHILD,
 926                                              &objectclass->schemaIDGUID, req);
 927         if (ret != LDB_SUCCESS) {
 928                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
 929                                        "acl: unable to get access to %s\n",
 930                                        ldb_dn_get_linearized(req->op.add.message->dn));
 931                 return ret;
 932         }
 933         return ldb_next_request(module, req);
 934 }
 935
 936 /* checks if modifications are allowed on "Member" attribute */
 937 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
 938                                      struct ldb_module *module,
 939                                      struct ldb_request *req,
 940                                      struct security_descriptor *sd,
 941                                      struct dom_sid *sid,
 942                                      const struct dsdb_attribute *attr,
 943                                      const struct dsdb_class *objectclass)
 944 {
 945         int ret;
 946         unsigned int i;
 947         struct ldb_context *ldb = ldb_module_get_ctx(module);
 948         struct ldb_dn *user_dn;
 949         struct ldb_message_element *member_el;
 950         const struct ldb_message *msg = NULL;
 951
 952         if (req->operation == LDB_MODIFY) {
 953                 msg = req->op.mod.message;
 954         } else if (req->operation == LDB_ADD) {
 955                 msg = req->op.add.message;
 956         } else {
 957                 return LDB_ERR_OPERATIONS_ERROR;
 958         }
 959
 960         /* if we have wp, we can do whatever we like */
 961         if (acl_check_access_on_attribute(module,
 962                                           mem_ctx,
 963                                           sd,
 964                                           sid,
 965                                           SEC_ADS_WRITE_PROP,
 966                                           attr, objectclass) == LDB_SUCCESS) {
 967                 return LDB_SUCCESS;
 968         }
 969         /* if we are adding/deleting ourselves, check for self membership */
 970         ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
 971                                   &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
 972                                   &user_dn);
 973         if (ret != LDB_SUCCESS) {
 974                 return ret;
 975         }
 976         member_el = ldb_msg_find_element(msg, "member");
 977         if (!member_el) {
 978                 return ldb_operr(ldb);
 979         }
 980         /* user can only remove oneself */
 981         if (member_el->num_values == 0) {
 982                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 983         }
 984         for (i = 0; i < member_el->num_values; i++) {
 985                 if (strcasecmp((const char *)member_el->values[i].data,
 986                                ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
 987                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 988                 }
 989         }
 990         ret = acl_check_extended_right(mem_ctx,
 991                                        module,
 992                                        req,
 993                                        objectclass,
 994                                        sd,
 995                                        acl_user_token(module),
 996                                        GUID_DRS_SELF_MEMBERSHIP,
 997                                        SEC_ADS_SELF_WRITE,
 998                                        sid);
 999         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
1000                 dsdb_acl_debug(sd, acl_user_token(module),
1001                                msg->dn,
1002                                true,
1003                                10);
1004         }
1005         return ret;
1006 }
1007
1008 static int acl_check_password_rights(
1009         TALLOC_CTX *mem_ctx,
1010         struct ldb_module *module,
1011         struct ldb_request *req,
1012         struct security_descriptor *sd,
1013         struct dom_sid *sid,
1014         const struct dsdb_class *objectclass,
1015         bool userPassword,
1016         struct  dsdb_control_password_acl_validation **control_for_response)
1017 {
1018         int ret = LDB_SUCCESS;
1019         unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
1020         unsigned int del_val_cnt = 0, add_val_cnt = 0, rep_val_cnt = 0;
1021         struct ldb_message_element *el;
1022         struct ldb_message *msg;
1023         struct ldb_control *c = NULL;
1024         const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
1025                                         "unicodePwd", NULL }, **l;
1026         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
1027         struct dsdb_control_password_acl_validation *pav = NULL;
1028
1029         if (tmp_ctx == NULL) {
1030                 return LDB_ERR_OPERATIONS_ERROR;
1031         }
1032
1033         pav = talloc_zero(req, struct dsdb_control_password_acl_validation);
1034         if (pav == NULL) {
1035                 talloc_free(tmp_ctx);
1036                 return LDB_ERR_OPERATIONS_ERROR;
1037         }
1038         /*
1039          * Set control_for_response to pav so it can be added to the response
1040          * and be passed up to the audit_log module which uses it to identify
1041          * password reset attempts.
1042          */
1043         *control_for_response = pav;
1044
1045         c = ldb_request_get_control(req, DSDB_CONTROL_PASSWORD_CHANGE_OID);
1046         if (c != NULL) {
1047                 pav->pwd_reset = false;
1048
1049                 /*
1050                  * The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
1051                  * have a user password change and not a set as the message
1052                  * looks like. In it's value blob it contains the NT and/or LM
1053                  * hash of the old password specified by the user.  This control
1054                  * is used by the SAMR and "kpasswd" password change mechanisms.
1055                  *
1056                  * This control can't be used by real LDAP clients,
1057                  * the only caller is samdb_set_password_internal(),
1058                  * so we don't have to strict verification of the input.
1059                  */
1060                 ret = acl_check_extended_right(tmp_ctx,
1061                                                module,
1062                                                req,
1063                                                objectclass,
1064                                                sd,
1065                                                acl_user_token(module),
1066                                                GUID_DRS_USER_CHANGE_PASSWORD,
1067                                                SEC_ADS_CONTROL_ACCESS,
1068                                                sid);
1069                 goto checked;
1070         }
1071
1072         c = ldb_request_get_control(req, DSDB_CONTROL_PASSWORD_HASH_VALUES_OID);
1073         if (c != NULL) {
1074                 pav->pwd_reset = true;
1075
1076                 /*
1077                  * The "DSDB_CONTROL_PASSWORD_HASH_VALUES_OID" control, without
1078                  * "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
1079                  * have a force password set.
1080                  * This control is used by the SAMR/NETLOGON/LSA password
1081                  * reset mechanisms.
1082                  *
1083                  * This control can't be used by real LDAP clients,
1084                  * the only caller is samdb_set_password_internal(),
1085                  * so we don't have to strict verification of the input.
1086                  */
1087                 ret = acl_check_extended_right(tmp_ctx,
1088                                                module,
1089                                                req,
1090                                                objectclass,
1091                                                sd,
1092                                                acl_user_token(module),
1093                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
1094                                                SEC_ADS_CONTROL_ACCESS,
1095                                                sid);
1096                 goto checked;
1097         }
1098
1099         el = ldb_msg_find_element(req->op.mod.message, "dBCSPwd");
1100         if (el != NULL) {
1101                 /*
1102                  * dBCSPwd is only allowed with a control.
1103                  */
1104                 talloc_free(tmp_ctx);
1105                 return LDB_ERR_UNWILLING_TO_PERFORM;
1106         }
1107
1108         msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
1109         if (msg == NULL) {
1110                 return ldb_module_oom(module);
1111         }
1112         for (l = passwordAttrs; *l != NULL; l++) {
1113                 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
1114                         continue;
1115                 }
1116
1117                 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
1118                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
1119                                 ++del_attr_cnt;
1120                                 del_val_cnt += el->num_values;
1121                         }
1122                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
1123                                 ++add_attr_cnt;
1124                                 add_val_cnt += el->num_values;
1125                         }
1126                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
1127                                 ++rep_attr_cnt;
1128                                 rep_val_cnt += el->num_values;
1129                         }
1130                         ldb_msg_remove_element(msg, el);
1131                 }
1132         }
1133
1134         /* single deletes will be handled by the "password_hash" LDB module
1135          * later in the stack, so we let it though here */
1136         if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
1137                 talloc_free(tmp_ctx);
1138                 return LDB_SUCCESS;
1139         }
1140
1141
1142         if (rep_attr_cnt > 0) {
1143                 pav->pwd_reset = true;
1144
1145                 ret = acl_check_extended_right(tmp_ctx,
1146                                                module,
1147                                                req,
1148                                                objectclass,
1149                                                sd,
1150                                                acl_user_token(module),
1151                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
1152                                                SEC_ADS_CONTROL_ACCESS,
1153                                                sid);
1154                 goto checked;
1155         }
1156
1157         if (add_attr_cnt != del_attr_cnt) {
1158                 pav->pwd_reset = true;
1159
1160                 ret = acl_check_extended_right(tmp_ctx,
1161                                                module,
1162                                                req,
1163                                                objectclass,
1164                                                sd,
1165                                                acl_user_token(module),
1166                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
1167                                                SEC_ADS_CONTROL_ACCESS,
1168                                                sid);
1169                 goto checked;
1170         }
1171
1172         if (add_val_cnt == 1 && del_val_cnt == 1) {
1173                 pav->pwd_reset = false;
1174
1175                 ret = acl_check_extended_right(tmp_ctx,
1176                                                module,
1177                                                req,
1178                                                objectclass,
1179                                                sd,
1180                                                acl_user_token(module),
1181                                                GUID_DRS_USER_CHANGE_PASSWORD,
1182                                                SEC_ADS_CONTROL_ACCESS,
1183                                                sid);
1184                 /* Very strange, but we get constraint violation in this case */
1185                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
1186                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
1187                 }
1188                 goto checked;
1189         }
1190
1191         if (add_val_cnt == 1 && del_val_cnt == 0) {
1192                 pav->pwd_reset = true;
1193
1194                 ret = acl_check_extended_right(tmp_ctx,
1195                                                module,
1196                                                req,
1197                                                objectclass,
1198                                                sd,
1199                                                acl_user_token(module),
1200                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
1201                                                SEC_ADS_CONTROL_ACCESS,
1202                                                sid);
1203                 /* Very strange, but we get constraint violation in this case */
1204                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
1205                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
1206                 }
1207                 goto checked;
1208         }
1209
1210         /*
1211          * Everything else is handled by the password_hash module where it will
1212          * fail, but with the correct error code when the module is again
1213          * checking the attributes. As the change request will lack the
1214          * DSDB_CONTROL_PASSWORD_ACL_VALIDATION_OID control, we can be sure that
1215          * any modification attempt that went this way will be rejected.
1216          */
1217
1218         talloc_free(tmp_ctx);
1219         return LDB_SUCCESS;
1220
1221 checked:
1222         if (ret != LDB_SUCCESS) {
1223                 dsdb_acl_debug(sd, acl_user_token(module),
1224                                req->op.mod.message->dn,
1225                                true,
1226                                10);
1227                 talloc_free(tmp_ctx);
1228                 return ret;
1229         }
1230
1231         ret = ldb_request_add_control(req,
1232                 DSDB_CONTROL_PASSWORD_ACL_VALIDATION_OID, false, pav);
1233         if (ret != LDB_SUCCESS) {
1234                 ldb_debug(ldb_module_get_ctx(module), LDB_DEBUG_ERROR,
1235                           "Unable to register ACL validation control!\n");
1236                 return ret;
1237         }
1238         return LDB_SUCCESS;
1239 }
1240
1241 /*
1242  * Context needed by acl_callback
1243  */
1244 struct acl_callback_context {
1245         struct ldb_request *request;
1246         struct ldb_module *module;
1247 };
1248
1249 /*
1250  * @brief Copy the password validation control to the reply.
1251  *
1252  * Copy the dsdb_control_password_acl_validation control from the request,
1253  * to the reply.  The control is used by the audit_log module to identify
1254  * password rests.
1255  *
1256  * @param req the ldb request.
1257  * @param ares the result, updated with the control.
1258  */
1259 static void copy_password_acl_validation_control(
1260         struct ldb_request *req,
1261         struct ldb_reply *ares)
1262 {
1263         struct ldb_control *pav_ctrl = NULL;
1264         struct dsdb_control_password_acl_validation *pav = NULL;
1265
1266         pav_ctrl = ldb_request_get_control(
1267                 discard_const(req),
1268                 DSDB_CONTROL_PASSWORD_ACL_VALIDATION_OID);
1269         if (pav_ctrl == NULL) {
1270                 return;
1271         }
1272
1273         pav = talloc_get_type_abort(
1274                 pav_ctrl->data,
1275                 struct dsdb_control_password_acl_validation);
1276         if (pav == NULL) {
1277                 return;
1278         }
1279         ldb_reply_add_control(
1280                 ares,
1281                 DSDB_CONTROL_PASSWORD_ACL_VALIDATION_OID,
1282                 false,
1283                 pav);
1284 }
1285 /*
1286  * @brief call back function for acl_modify.
1287  *
1288  * Calls acl_copy to copy the dsdb_control_password_acl_validation from
1289  * the request to the reply.
1290  *
1291  * @param req the ldb_request.
1292  * @param ares the operation result.
1293  *
1294  * @return the LDB_STATUS
1295  */
1296 static int acl_callback(struct ldb_request *req, struct ldb_reply *ares)
1297 {
1298         struct acl_callback_context *ac = NULL;
1299
1300         ac = talloc_get_type(req->context, struct acl_callback_context);
1301
1302         if (!ares) {
1303                 return ldb_module_done(
1304                         ac->request,
1305                         NULL,
1306                         NULL,
1307                         LDB_ERR_OPERATIONS_ERROR);
1308         }
1309
1310         /* pass on to the callback */
1311         switch (ares->type) {
1312         case LDB_REPLY_ENTRY:
1313                 return ldb_module_send_entry(
1314                         ac->request,
1315                         ares->message,
1316                         ares->controls);
1317
1318         case LDB_REPLY_REFERRAL:
1319                 return ldb_module_send_referral(
1320                         ac->request,
1321                         ares->referral);
1322
1323         case LDB_REPLY_DONE:
1324                 /*
1325                  * Copy the ACL control from the request to the response
1326                  */
1327                 copy_password_acl_validation_control(req, ares);
1328                 return ldb_module_done(
1329                         ac->request,
1330                         ares->controls,
1331                         ares->response,
1332                         ares->error);
1333
1334         default:
1335                 /* Can't happen */
1336                 return LDB_ERR_OPERATIONS_ERROR;
1337         }
1338 }
1339
1340 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
1341 {
1342         int ret;
1343         struct ldb_context *ldb = ldb_module_get_ctx(module);
1344         const struct dsdb_schema *schema;
1345         unsigned int i;
1346         const struct dsdb_class *objectclass;
1347         struct ldb_result *acl_res;
1348         struct security_descriptor *sd;
1349         struct dom_sid *sid = NULL;
1350         struct ldb_control *as_system;
1351         struct ldb_control *is_undelete;
1352         bool userPassword;
1353         bool password_rights_checked = false;
1354         TALLOC_CTX *tmp_ctx;
1355         const struct ldb_message *msg = req->op.mod.message;
1356         static const char *acl_attrs[] = {
1357                 "nTSecurityDescriptor",
1358                 "objectClass",
1359                 "objectSid",
1360                 NULL
1361         };
1362         struct acl_callback_context *context = NULL;
1363         struct ldb_request *new_req = NULL;
1364         struct  dsdb_control_password_acl_validation *pav = NULL;
1365         struct ldb_control **controls = NULL;
1366
1367         if (ldb_dn_is_special(msg->dn)) {
1368                 return ldb_next_request(module, req);
1369         }
1370
1371         as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1372         if (as_system != NULL) {
1373                 as_system->critical = 0;
1374         }
1375
1376         is_undelete = ldb_request_get_control(req, DSDB_CONTROL_RESTORE_TOMBSTONE_OID);
1377
1378         /* Don't print this debug statement if elements[0].name is going to be NULL */
1379         if (msg->num_elements > 0) {
1380                 DEBUG(10, ("ldb:acl_modify: %s\n", msg->elements[0].name));
1381         }
1382         if (dsdb_module_am_system(module) || as_system) {
1383                 return ldb_next_request(module, req);
1384         }
1385
1386         tmp_ctx = talloc_new(req);
1387         if (tmp_ctx == NULL) {
1388                 return ldb_oom(ldb);
1389         }
1390
1391         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, msg->dn,
1392                                     acl_attrs,
1393                                     DSDB_FLAG_NEXT_MODULE |
1394                                     DSDB_FLAG_AS_SYSTEM |
1395                                     DSDB_SEARCH_SHOW_RECYCLED,
1396                                     req);
1397
1398         if (ret != LDB_SUCCESS) {
1399                 goto fail;
1400         }
1401
1402         userPassword = dsdb_user_password_support(module, req, req);
1403
1404         schema = dsdb_get_schema(ldb, tmp_ctx);
1405         if (!schema) {
1406                 talloc_free(tmp_ctx);
1407                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1408                                  "acl_modify: Error obtaining schema.");
1409         }
1410
1411         ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
1412         if (ret != LDB_SUCCESS) {
1413                 talloc_free(tmp_ctx);
1414                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1415                                  "acl_modify: Error retrieving security descriptor.");
1416         }
1417         /* Theoretically we pass the check if the object has no sd */
1418         if (!sd) {
1419                 goto success;
1420         }
1421
1422         objectclass = dsdb_get_structural_oc_from_msg(schema, acl_res->msgs[0]);
1423         if (!objectclass) {
1424                 talloc_free(tmp_ctx);
1425                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1426                                  "acl_modify: Error retrieving object class for GUID.");
1427         }
1428         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1429         for (i=0; i < msg->num_elements; i++) {
1430                 const struct ldb_message_element *el = &msg->elements[i];
1431                 const struct dsdb_attribute *attr;
1432
1433                 /*
1434                  * This basic attribute existence check with the right errorcode
1435                  * is needed since this module is the first one which requests
1436                  * schema attribute information.
1437                  * The complete attribute checking is done in the
1438                  * "objectclass_attrs" module behind this one.
1439                  *
1440                  * NOTE: "clearTextPassword" is not defined in the schema.
1441                  */
1442                 attr = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1443                 if (!attr && ldb_attr_cmp("clearTextPassword", el->name) != 0) {
1444                         ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' "
1445                                                "on entry '%s' was not found in the schema!",
1446                                                req->op.mod.message->elements[i].name,
1447                                        ldb_dn_get_linearized(req->op.mod.message->dn));
1448                         ret =  LDB_ERR_NO_SUCH_ATTRIBUTE;
1449                         goto fail;
1450                 }
1451
1452                 if (ldb_attr_cmp("nTSecurityDescriptor", el->name) == 0) {
1453                         uint32_t sd_flags = dsdb_request_sd_flags(req, NULL);
1454                         uint32_t access_mask = 0;
1455
1456                         if (sd_flags & (SECINFO_OWNER|SECINFO_GROUP)) {
1457                                 access_mask |= SEC_STD_WRITE_OWNER;
1458                         }
1459                         if (sd_flags & SECINFO_DACL) {
1460                                 access_mask |= SEC_STD_WRITE_DAC;
1461                         }
1462                         if (sd_flags & SECINFO_SACL) {
1463                                 access_mask |= SEC_FLAG_SYSTEM_SECURITY;
1464                         }
1465
1466                         ret = acl_check_access_on_attribute(module,
1467                                                             tmp_ctx,
1468                                                             sd,
1469                                                             sid,
1470                                                             access_mask,
1471                                                             attr,
1472                                                             objectclass);
1473                         if (ret != LDB_SUCCESS) {
1474                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1475                                                        "Object %s has no write dacl access\n",
1476                                                        ldb_dn_get_linearized(msg->dn));
1477                                 dsdb_acl_debug(sd,
1478                                                acl_user_token(module),
1479                                                msg->dn,
1480                                                true,
1481                                                10);
1482                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1483                                 goto fail;
1484                         }
1485                 } else if (ldb_attr_cmp("member", el->name) == 0) {
1486                         ret = acl_check_self_membership(tmp_ctx,
1487                                                         module,
1488                                                         req,
1489                                                         sd,
1490                                                         sid,
1491                                                         attr,
1492                                                         objectclass);
1493                         if (ret != LDB_SUCCESS) {
1494                                 goto fail;
1495                         }
1496                 } else if (ldb_attr_cmp("dBCSPwd", el->name) == 0) {
1497                         /* this one is not affected by any rights, we should let it through
1498                            so that passwords_hash returns the correct error */
1499                         continue;
1500                 } else if (ldb_attr_cmp("unicodePwd", el->name) == 0 ||
1501                            (userPassword && ldb_attr_cmp("userPassword", el->name) == 0) ||
1502                            ldb_attr_cmp("clearTextPassword", el->name) == 0) {
1503                         /*
1504                          * Ideally we would do the acl_check_password_rights
1505                          * before we checked the other attributes, i.e. in a
1506                          * loop before the current one.
1507                          * Have not done this as yet in order to limit the size
1508                          * of the change. To limit the possibility of breaking
1509                          * the ACL logic.
1510                          */
1511                         if (password_rights_checked) {
1512                                 continue;
1513                         }
1514                         ret = acl_check_password_rights(tmp_ctx,
1515                                                         module,
1516                                                         req,
1517                                                         sd,
1518                                                         sid,
1519                                                         objectclass,
1520                                                         userPassword,
1521                                                         &pav);
1522                         if (ret != LDB_SUCCESS) {
1523                                 goto fail;
1524                         }
1525                         password_rights_checked = true;
1526                 } else if (ldb_attr_cmp("servicePrincipalName", el->name) == 0) {
1527                         ret = acl_check_spn(tmp_ctx,
1528                                             module,
1529                                             req,
1530                                             el,
1531                                             sd,
1532                                             sid,
1533                                             attr,
1534                                             objectclass);
1535                         if (ret != LDB_SUCCESS) {
1536                                 goto fail;
1537                         }
1538                 } else if (is_undelete != NULL && (ldb_attr_cmp("isDeleted", el->name) == 0)) {
1539                         /*
1540                          * in case of undelete op permissions on
1541                          * isDeleted are irrelevant and
1542                          * distinguishedName is removed by the
1543                          * tombstone_reanimate module
1544                          */
1545                         continue;
1546                 } else {
1547                         ret = acl_check_access_on_attribute(module,
1548                                                             tmp_ctx,
1549                                                             sd,
1550                                                             sid,
1551                                                             SEC_ADS_WRITE_PROP,
1552                                                             attr,
1553                                                             objectclass);
1554                         if (ret != LDB_SUCCESS) {
1555                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1556                                                        "Object %s has no write property access\n",
1557                                                        ldb_dn_get_linearized(msg->dn));
1558                                 dsdb_acl_debug(sd,
1559                                                acl_user_token(module),
1560                                                msg->dn,
1561                                                true,
1562                                                10);
1563                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1564                                 goto fail;
1565                         }
1566                 }
1567         }
1568
1569 success:
1570         talloc_free(tmp_ctx);
1571         context = talloc_zero(req, struct acl_callback_context);
1572
1573         if (context == NULL) {
1574                 return ldb_oom(ldb);
1575         }
1576         context->request = req;
1577         context->module  = module;
1578         ret = ldb_build_mod_req(
1579                 &new_req,
1580                 ldb,
1581                 req,
1582                 req->op.mod.message,
1583                 req->controls,
1584                 context,
1585                 acl_callback,
1586                 req);
1587         if (ret != LDB_SUCCESS) {
1588                 return ret;
1589         }
1590         return ldb_next_request(module, new_req);
1591 fail:
1592         talloc_free(tmp_ctx);
1593         /*
1594          * We copy the pav into the result, so that the password reset
1595          * logging code in audit_log can log failed password reset attempts.
1596          */
1597         if (pav) {
1598                 struct ldb_control *control = NULL;
1599
1600                 controls = talloc_zero_array(req, struct ldb_control *, 2);
1601                 if (controls == NULL) {
1602                         return ldb_oom(ldb);
1603                 }
1604
1605                 control = talloc(controls, struct ldb_control);
1606
1607                 if (control == NULL) {
1608                         return ldb_oom(ldb);
1609                 }
1610
1611                 control->oid= talloc_strdup(
1612                         control,
1613                         DSDB_CONTROL_PASSWORD_ACL_VALIDATION_OID);
1614                 if (control->oid == NULL) {
1615                         return ldb_oom(ldb);
1616                 }
1617                 control->critical       = false;
1618                 control->data   = pav;
1619                 *controls = control;
1620         }
1621         return ldb_module_done(req, controls, NULL, ret);
1622 }
1623
1624 /* similar to the modify for the time being.
1625  * We need to consider the special delete tree case, though - TODO */
1626 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1627 {
1628         int ret;
1629         struct ldb_dn *parent;
1630         struct ldb_context *ldb;
1631         struct ldb_dn *nc_root;
1632         struct ldb_control *as_system;
1633         const struct dsdb_schema *schema;
1634         const struct dsdb_class *objectclass;
1635         struct security_descriptor *sd = NULL;
1636         struct dom_sid *sid = NULL;
1637         struct ldb_result *acl_res;
1638         static const char *acl_attrs[] = {
1639                 "nTSecurityDescriptor",
1640                 "objectClass",
1641                 "objectSid",
1642                 NULL
1643         };
1644
1645         if (ldb_dn_is_special(req->op.del.dn)) {
1646                 return ldb_next_request(module, req);
1647         }
1648
1649         as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1650         if (as_system != NULL) {
1651                 as_system->critical = 0;
1652         }
1653
1654         if (dsdb_module_am_system(module) || as_system) {
1655                 return ldb_next_request(module, req);
1656         }
1657
1658         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1659
1660         ldb = ldb_module_get_ctx(module);
1661
1662         parent = ldb_dn_get_parent(req, req->op.del.dn);
1663         if (parent == NULL) {
1664                 return ldb_oom(ldb);
1665         }
1666
1667         /* Make sure we aren't deleting a NC */
1668
1669         ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1670         if (ret != LDB_SUCCESS) {
1671                 return ret;
1672         }
1673         if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1674                 talloc_free(nc_root);
1675                 DEBUG(10,("acl:deleting a NC\n"));
1676                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1677                 return ldb_module_done(req, NULL, NULL,
1678                                        LDB_ERR_UNWILLING_TO_PERFORM);
1679         }
1680         talloc_free(nc_root);
1681
1682         ret = dsdb_module_search_dn(module, req, &acl_res,
1683                                     req->op.del.dn, acl_attrs,
1684                                     DSDB_FLAG_NEXT_MODULE |
1685                                     DSDB_FLAG_AS_SYSTEM |
1686                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1687         /* we sould be able to find the parent */
1688         if (ret != LDB_SUCCESS) {
1689                 DEBUG(10,("acl: failed to find object %s\n",
1690                           ldb_dn_get_linearized(req->op.rename.olddn)));
1691                 return ret;
1692         }
1693
1694         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1695         if (ret != LDB_SUCCESS) {
1696                 return ldb_operr(ldb);
1697         }
1698         if (!sd) {
1699                 return ldb_operr(ldb);
1700         }
1701
1702         schema = dsdb_get_schema(ldb, req);
1703         if (!schema) {
1704                 return ldb_operr(ldb);
1705         }
1706
1707         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1708
1709         objectclass = dsdb_get_structural_oc_from_msg(schema, acl_res->msgs[0]);
1710         if (!objectclass) {
1711                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1712                                  "acl_modify: Error retrieving object class for GUID.");
1713         }
1714
1715         if (ldb_request_get_control(req, LDB_CONTROL_TREE_DELETE_OID)) {
1716                 ret = acl_check_access_on_objectclass(module, req, sd, sid,
1717                                                       SEC_ADS_DELETE_TREE,
1718                                                       objectclass);
1719                 if (ret != LDB_SUCCESS) {
1720                         return ret;
1721                 }
1722
1723                 return ldb_next_request(module, req);
1724         }
1725
1726         /* First check if we have delete object right */
1727         ret = acl_check_access_on_objectclass(module, req, sd, sid,
1728                                               SEC_STD_DELETE,
1729                                               objectclass);
1730         if (ret == LDB_SUCCESS) {
1731                 return ldb_next_request(module, req);
1732         }
1733
1734         /* Nope, we don't have delete object. Lets check if we have delete
1735          * child on the parent */
1736         ret = dsdb_module_check_access_on_dn(module, req, parent,
1737                                              SEC_ADS_DELETE_CHILD,
1738                                              &objectclass->schemaIDGUID,
1739                                              req);
1740         if (ret != LDB_SUCCESS) {
1741                 return ret;
1742         }
1743
1744         return ldb_next_request(module, req);
1745 }
1746 static int acl_check_reanimate_tombstone(TALLOC_CTX *mem_ctx,
1747                                          struct ldb_module *module,
1748                                          struct ldb_request *req,
1749                                          struct ldb_dn *nc_root)
1750 {
1751         int ret;
1752         struct ldb_result *acl_res;
1753         struct security_descriptor *sd = NULL;
1754         struct dom_sid *sid = NULL;
1755         const struct dsdb_schema *schema = NULL;
1756         const struct dsdb_class *objectclass = NULL;
1757         struct ldb_context *ldb = ldb_module_get_ctx(module);
1758         static const char *acl_attrs[] = {
1759                 "nTSecurityDescriptor",
1760                 "objectClass",
1761                 "objectSid",
1762                 NULL
1763         };
1764
1765         ret = dsdb_module_search_dn(module, mem_ctx, &acl_res,
1766                                     nc_root, acl_attrs,
1767                                     DSDB_FLAG_NEXT_MODULE |
1768                                     DSDB_FLAG_AS_SYSTEM |
1769                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1770         if (ret != LDB_SUCCESS) {
1771                 DEBUG(10,("acl: failed to find object %s\n",
1772                           ldb_dn_get_linearized(nc_root)));
1773                 return ret;
1774         }
1775
1776         ret = dsdb_get_sd_from_ldb_message(mem_ctx, req, acl_res->msgs[0], &sd);
1777         sid = samdb_result_dom_sid(mem_ctx, acl_res->msgs[0], "objectSid");
1778         schema = dsdb_get_schema(ldb, req);
1779         if (!schema) {
1780                 return LDB_ERR_OPERATIONS_ERROR;
1781         }
1782         objectclass = dsdb_get_structural_oc_from_msg(schema, acl_res->msgs[0]);
1783         if (ret != LDB_SUCCESS || !sd) {
1784                 return ldb_operr(ldb_module_get_ctx(module));
1785         }
1786         return acl_check_extended_right(mem_ctx,
1787                                         module,
1788                                         req,
1789                                         objectclass,
1790                                         sd,
1791                                         acl_user_token(module),
1792                                         GUID_DRS_REANIMATE_TOMBSTONE,
1793                                         SEC_ADS_CONTROL_ACCESS, sid);
1794 }
1795
1796 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1797 {
1798         int ret;
1799         struct ldb_dn *oldparent;
1800         struct ldb_dn *newparent;
1801         const struct dsdb_schema *schema;
1802         const struct dsdb_class *objectclass;
1803         const struct dsdb_attribute *attr = NULL;
1804         struct ldb_context *ldb;
1805         struct security_descriptor *sd = NULL;
1806         struct dom_sid *sid = NULL;
1807         struct ldb_result *acl_res;
1808         struct ldb_dn *nc_root;
1809         struct ldb_control *as_system;
1810         struct ldb_control *is_undelete;
1811         TALLOC_CTX *tmp_ctx;
1812         const char *rdn_name;
1813         static const char *acl_attrs[] = {
1814                 "nTSecurityDescriptor",
1815                 "objectClass",
1816                 "objectSid",
1817                 NULL
1818         };
1819
1820         if (ldb_dn_is_special(req->op.rename.olddn)) {
1821                 return ldb_next_request(module, req);
1822         }
1823
1824         as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1825         if (as_system != NULL) {
1826                 as_system->critical = 0;
1827         }
1828
1829         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1830         if (dsdb_module_am_system(module) || as_system) {
1831                 return ldb_next_request(module, req);
1832         }
1833
1834         ldb = ldb_module_get_ctx(module);
1835
1836         tmp_ctx = talloc_new(req);
1837         if (tmp_ctx == NULL) {
1838                 return ldb_oom(ldb);
1839         }
1840
1841         oldparent = ldb_dn_get_parent(tmp_ctx, req->op.rename.olddn);
1842         if (oldparent == NULL) {
1843                 return ldb_oom(ldb);
1844         }
1845         newparent = ldb_dn_get_parent(tmp_ctx, req->op.rename.newdn);
1846         if (newparent == NULL) {
1847                 return ldb_oom(ldb);
1848         }
1849
1850         /* Make sure we aren't renaming/moving a NC */
1851
1852         ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1853         if (ret != LDB_SUCCESS) {
1854                 return ret;
1855         }
1856         if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1857                 talloc_free(nc_root);
1858                 DEBUG(10,("acl:renaming/moving a NC\n"));
1859                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1860                 return ldb_module_done(req, NULL, NULL,
1861                                        LDB_ERR_UNWILLING_TO_PERFORM);
1862         }
1863
1864         /* special check for undelete operation */
1865         is_undelete = ldb_request_get_control(req, DSDB_CONTROL_RESTORE_TOMBSTONE_OID);
1866         if (is_undelete != NULL) {
1867                 is_undelete->critical = 0;
1868                 ret = acl_check_reanimate_tombstone(tmp_ctx, module, req, nc_root);
1869                 if (ret != LDB_SUCCESS) {
1870                         talloc_free(tmp_ctx);
1871                         return ret;
1872                 }
1873         }
1874         talloc_free(nc_root);
1875
1876         /* Look for the parent */
1877
1878         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1879                                     req->op.rename.olddn, acl_attrs,
1880                                     DSDB_FLAG_NEXT_MODULE |
1881                                     DSDB_FLAG_AS_SYSTEM |
1882                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1883         /* we sould be able to find the parent */
1884         if (ret != LDB_SUCCESS) {
1885                 DEBUG(10,("acl: failed to find object %s\n",
1886                           ldb_dn_get_linearized(req->op.rename.olddn)));
1887                 talloc_free(tmp_ctx);
1888                 return ret;
1889         }
1890
1891         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1892         if (ret != LDB_SUCCESS) {
1893                 talloc_free(tmp_ctx);
1894                 return ldb_operr(ldb);
1895         }
1896         if (!sd) {
1897                 talloc_free(tmp_ctx);
1898                 return ldb_operr(ldb);
1899         }
1900
1901         schema = dsdb_get_schema(ldb, acl_res);
1902         if (!schema) {
1903                 talloc_free(tmp_ctx);
1904                 return ldb_operr(ldb);
1905         }
1906
1907         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1908
1909         objectclass = dsdb_get_structural_oc_from_msg(schema, acl_res->msgs[0]);
1910         if (!objectclass) {
1911                 talloc_free(tmp_ctx);
1912                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1913                                  "acl_modify: Error retrieving object class for GUID.");
1914         }
1915
1916         attr = dsdb_attribute_by_lDAPDisplayName(schema, "name");
1917         if (attr == NULL) {
1918                 talloc_free(tmp_ctx);
1919                 return ldb_operr(ldb);
1920         }
1921
1922         ret = acl_check_access_on_attribute(module, tmp_ctx, sd, sid,
1923                                             SEC_ADS_WRITE_PROP,
1924                                             attr, objectclass);
1925         if (ret != LDB_SUCCESS) {
1926                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1927                                        "Object %s has no wp on %s\n",
1928                                        ldb_dn_get_linearized(req->op.rename.olddn),
1929                                        attr->lDAPDisplayName);
1930                 dsdb_acl_debug(sd,
1931                           acl_user_token(module),
1932                           req->op.rename.olddn,
1933                           true,
1934                           10);
1935                 talloc_free(tmp_ctx);
1936                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1937         }
1938
1939         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1940         if (rdn_name == NULL) {
1941                 talloc_free(tmp_ctx);
1942                 return ldb_operr(ldb);
1943         }
1944
1945         attr = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
1946         if (attr == NULL) {
1947                 talloc_free(tmp_ctx);
1948                 return ldb_operr(ldb);
1949         }
1950
1951         ret = acl_check_access_on_attribute(module, tmp_ctx, sd, sid,
1952                                             SEC_ADS_WRITE_PROP,
1953                                             attr, objectclass);
1954         if (ret != LDB_SUCCESS) {
1955                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1956                                        "Object %s has no wp on %s\n",
1957                                        ldb_dn_get_linearized(req->op.rename.olddn),
1958                                        attr->lDAPDisplayName);
1959                 dsdb_acl_debug(sd,
1960                           acl_user_token(module),
1961                           req->op.rename.olddn,
1962                           true,
1963                           10);
1964                 talloc_free(tmp_ctx);
1965                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1966         }
1967
1968         if (ldb_dn_compare(oldparent, newparent) == 0) {
1969                 /* regular rename, not move, nothing more to do */
1970                 talloc_free(tmp_ctx);
1971                 return ldb_next_request(module, req);
1972         }
1973
1974         /* new parent should have create child */
1975         ret = dsdb_module_check_access_on_dn(module, req, newparent,
1976                                              SEC_ADS_CREATE_CHILD,
1977                                              &objectclass->schemaIDGUID, req);
1978         if (ret != LDB_SUCCESS) {
1979                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1980                                        "acl:access_denied renaming %s",
1981                                        ldb_dn_get_linearized(req->op.rename.olddn));
1982                 talloc_free(tmp_ctx);
1983                 return ret;
1984         }
1985
1986         /* do we have delete object on the object? */
1987         /* this access is not necessary for undelete ops */
1988         if (is_undelete == NULL) {
1989                 ret = acl_check_access_on_objectclass(module, tmp_ctx, sd, sid,
1990                                                       SEC_STD_DELETE,
1991                                                       objectclass);
1992                 if (ret == LDB_SUCCESS) {
1993                         talloc_free(tmp_ctx);
1994                         return ldb_next_request(module, req);
1995                 }
1996                 /* what about delete child on the current parent */
1997                 ret = dsdb_module_check_access_on_dn(module, req, oldparent,
1998                                                      SEC_ADS_DELETE_CHILD,
1999                                                      &objectclass->schemaIDGUID,
2000                                                      req);
2001                 if (ret != LDB_SUCCESS) {
2002                         ldb_asprintf_errstring(ldb_module_get_ctx(module),
2003                                                "acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn));
2004                         talloc_free(tmp_ctx);
2005                         return ldb_module_done(req, NULL, NULL, ret);
2006                 }
2007         }
2008         talloc_free(tmp_ctx);
2009
2010         return ldb_next_request(module, req);
2011 }
2012
2013 static int acl_search_update_confidential_attrs(struct acl_context *ac,
2014                                                 struct acl_private *data)
2015 {
2016         struct dsdb_attribute *a;
2017         uint32_t n = 0;
2018
2019         if (data->acl_search) {
2020                 /*
2021                  * If acl:search is activated, the acl_read module
2022                  * protects confidential attributes.
2023                  */
2024                 return LDB_SUCCESS;
2025         }
2026
2027         if ((ac->schema == data->cached_schema_ptr) &&
2028             (ac->schema->metadata_usn == data->cached_schema_metadata_usn))
2029         {
2030                 return LDB_SUCCESS;
2031         }
2032
2033         data->cached_schema_ptr = NULL;
2034         data->cached_schema_loaded_usn = 0;
2035         data->cached_schema_metadata_usn = 0;
2036         TALLOC_FREE(data->confidential_attrs);
2037
2038         if (ac->schema == NULL) {
2039                 return LDB_SUCCESS;
2040         }
2041
2042         for (a = ac->schema->attributes; a; a = a->next) {
2043                 const char **attrs = data->confidential_attrs;
2044
2045                 if (!(a->searchFlags & SEARCH_FLAG_CONFIDENTIAL)) {
2046                         continue;
2047                 }
2048
2049                 attrs = talloc_realloc(data, attrs, const char *, n + 2);
2050                 if (attrs == NULL) {
2051                         TALLOC_FREE(data->confidential_attrs);
2052                         return ldb_module_oom(ac->module);
2053                 }
2054
2055                 attrs[n] = a->lDAPDisplayName;
2056                 attrs[n+1] = NULL;
2057                 n++;
2058
2059                 data->confidential_attrs = attrs;
2060         }
2061
2062         data->cached_schema_ptr = ac->schema;
2063         data->cached_schema_metadata_usn = ac->schema->metadata_usn;
2064
2065         return LDB_SUCCESS;
2066 }
2067
2068 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
2069 {
2070         struct acl_context *ac;
2071         struct acl_private *data;
2072         struct ldb_result *acl_res;
2073         static const char *acl_attrs[] = {
2074                 "objectClass",
2075                 "nTSecurityDescriptor",
2076                 "objectSid",
2077                 NULL
2078         };
2079         int ret;
2080         unsigned int i;
2081
2082         ac = talloc_get_type(req->context, struct acl_context);
2083         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
2084         if (!ares) {
2085                 return ldb_module_done(ac->req, NULL, NULL,
2086                                        LDB_ERR_OPERATIONS_ERROR);
2087         }
2088         if (ares->error != LDB_SUCCESS) {
2089                 return ldb_module_done(ac->req, ares->controls,
2090                                        ares->response, ares->error);
2091         }
2092
2093         switch (ares->type) {
2094         case LDB_REPLY_ENTRY:
2095                 if (ac->constructed_attrs) {
2096                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
2097                                                     acl_attrs,
2098                                                     DSDB_FLAG_NEXT_MODULE |
2099                                                     DSDB_FLAG_AS_SYSTEM |
2100                                                     DSDB_SEARCH_SHOW_RECYCLED,
2101                                                     req);
2102                         if (ret != LDB_SUCCESS) {
2103                                 return ldb_module_done(ac->req, NULL, NULL, ret);
2104                         }
2105                 }
2106
2107                 if (ac->allowedAttributes || ac->allowedAttributesEffective) {
2108                         ret = acl_allowedAttributes(ac->module, ac->schema,
2109                                                     acl_res->msgs[0],
2110                                                     ares->message, ac);
2111                         if (ret != LDB_SUCCESS) {
2112                                 return ldb_module_done(ac->req, NULL, NULL, ret);
2113                         }
2114                 }
2115
2116                 if (ac->allowedChildClasses) {
2117                         ret = acl_childClasses(ac->module, ac->schema,
2118                                                acl_res->msgs[0],
2119                                                ares->message,
2120                                                "allowedChildClasses");
2121                         if (ret != LDB_SUCCESS) {
2122                                 return ldb_module_done(ac->req, NULL, NULL, ret);
2123                         }
2124                 }
2125
2126                 if (ac->allowedChildClassesEffective) {
2127                         ret = acl_childClassesEffective(ac->module, ac->schema,
2128                                                         acl_res->msgs[0],
2129                                                         ares->message, ac);
2130                         if (ret != LDB_SUCCESS) {
2131                                 return ldb_module_done(ac->req, NULL, NULL, ret);
2132                         }
2133                 }
2134
2135                 if (ac->sDRightsEffective) {
2136                         ret = acl_sDRightsEffective(ac->module,
2137                                                     acl_res->msgs[0],
2138                                                     ares->message, ac);
2139                         if (ret != LDB_SUCCESS) {
2140                                 return ldb_module_done(ac->req, NULL, NULL, ret);
2141                         }
2142                 }
2143
2144                 if (data == NULL) {
2145                         return ldb_module_send_entry(ac->req, ares->message,
2146                                                      ares->controls);
2147                 }
2148
2149                 if (ac->am_system) {
2150                         return ldb_module_send_entry(ac->req, ares->message,
2151                                                      ares->controls);
2152                 }
2153
2154                 if (data->password_attrs != NULL) {
2155                         for (i = 0; data->password_attrs[i]; i++) {
2156                                 if ((!ac->userPassword) &&
2157                                     (ldb_attr_cmp(data->password_attrs[i],
2158                                                   "userPassword") == 0))
2159                                 {
2160                                                 continue;
2161                                 }
2162
2163                                 ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
2164                         }
2165                 }
2166
2167                 if (ac->am_administrator) {
2168                         return ldb_module_send_entry(ac->req, ares->message,
2169                                                      ares->controls);
2170                 }
2171
2172                 ret = acl_search_update_confidential_attrs(ac, data);
2173                 if (ret != LDB_SUCCESS) {
2174                         return ret;
2175                 }
2176
2177                 if (data->confidential_attrs != NULL) {
2178                         for (i = 0; data->confidential_attrs[i]; i++) {
2179                                 ldb_msg_remove_attr(ares->message,
2180                                                     data->confidential_attrs[i]);
2181                         }
2182                 }
2183
2184                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
2185
2186         case LDB_REPLY_REFERRAL:
2187                 return ldb_module_send_referral(ac->req, ares->referral);
2188
2189         case LDB_REPLY_DONE:
2190                 return ldb_module_done(ac->req, ares->controls,
2191                                        ares->response, LDB_SUCCESS);
2192
2193         }
2194         return LDB_SUCCESS;
2195 }
2196
2197 static int acl_search(struct ldb_module *module, struct ldb_request *req)
2198 {
2199         struct ldb_context *ldb;
2200         struct acl_context *ac;
2201         struct ldb_parse_tree *down_tree;
2202         struct ldb_request *down_req;
2203         struct acl_private *data;
2204         int ret;
2205         unsigned int i;
2206
2207         if (ldb_dn_is_special(req->op.search.base)) {
2208                 return ldb_next_request(module, req);
2209         }
2210
2211         ldb = ldb_module_get_ctx(module);
2212
2213         ac = talloc_zero(req, struct acl_context);
2214         if (ac == NULL) {
2215                 return ldb_oom(ldb);
2216         }
2217         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
2218
2219         ac->module = module;
2220         ac->req = req;
2221         ac->am_system = dsdb_module_am_system(module);
2222         ac->am_administrator = dsdb_module_am_administrator(module);
2223         ac->constructed_attrs = false;
2224         ac->modify_search = true;
2225         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
2226         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
2227         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
2228         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
2229         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
2230         ac->userPassword = true;
2231         ac->schema = dsdb_get_schema(ldb, ac);
2232
2233         ac->constructed_attrs |= ac->allowedAttributes;
2234         ac->constructed_attrs |= ac->allowedChildClasses;
2235         ac->constructed_attrs |= ac->allowedChildClassesEffective;
2236         ac->constructed_attrs |= ac->allowedAttributesEffective;
2237         ac->constructed_attrs |= ac->sDRightsEffective;
2238
2239         if (data == NULL) {
2240                 ac->modify_search = false;
2241         }
2242         if (ac->am_system) {
2243                 ac->modify_search = false;
2244         }
2245
2246         if (!ac->constructed_attrs && !ac->modify_search) {
2247                 talloc_free(ac);
2248                 return ldb_next_request(module, req);
2249         }
2250
2251         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
2252         if (data == NULL) {
2253                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
2254                                  "acl_private data is missing");
2255         }
2256         ac->userPassword = data->userPassword_support;
2257
2258         ret = acl_search_update_confidential_attrs(ac, data);
2259         if (ret != LDB_SUCCESS) {
2260                 return ret;
2261         }
2262
2263         down_tree = ldb_parse_tree_copy_shallow(ac, req->op.search.tree);
2264         if (down_tree == NULL) {
2265                 return ldb_oom(ldb);
2266         }
2267
2268         if (!ac->am_system && data->password_attrs) {
2269                 for (i = 0; data->password_attrs[i]; i++) {
2270                         if ((!ac->userPassword) &&
2271                             (ldb_attr_cmp(data->password_attrs[i],
2272                                           "userPassword") == 0))
2273                         {
2274                                 continue;
2275                         }
2276
2277                         ldb_parse_tree_attr_replace(down_tree,
2278                                                     data->password_attrs[i],
2279                                                     "kludgeACLredactedattribute");
2280                 }
2281         }
2282
2283         if (!ac->am_system && !ac->am_administrator && data->confidential_attrs) {
2284                 for (i = 0; data->confidential_attrs[i]; i++) {
2285                         ldb_parse_tree_attr_replace(down_tree,
2286                                                     data->confidential_attrs[i],
2287                                                     "kludgeACLredactedattribute");
2288                 }
2289         }
2290
2291         ret = ldb_build_search_req_ex(&down_req,
2292                                       ldb, ac,
2293                                       req->op.search.base,
2294                                       req->op.search.scope,
2295                                       down_tree,
2296                                       req->op.search.attrs,
2297                                       req->controls,
2298                                       ac, acl_search_callback,
2299                                       req);
2300         LDB_REQ_SET_LOCATION(down_req);
2301         if (ret != LDB_SUCCESS) {
2302                 return ret;
2303         }
2304         /* perform the search */
2305         return ldb_next_request(module, down_req);
2306 }
2307
2308 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
2309 {
2310         struct ldb_context *ldb = ldb_module_get_ctx(module);
2311         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
2312
2313         /* allow everybody to read the sequence number */
2314         if (strcmp(req->op.extended.oid,
2315                    LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
2316                 return ldb_next_request(module, req);
2317         }
2318
2319         if (dsdb_module_am_system(module) ||
2320             dsdb_module_am_administrator(module) || as_system) {
2321                 return ldb_next_request(module, req);
2322         } else {
2323                 ldb_asprintf_errstring(ldb,
2324                                        "acl_extended: "
2325                                        "attempted database modify not permitted. "
2326                                        "User %s is not SYSTEM or an administrator",
2327                                        acl_user_name(req, module));
2328                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
2329         }
2330 }
2331
2332 static const struct ldb_module_ops ldb_acl_module_ops = {
2333         .name              = "acl",
2334         .search            = acl_search,
2335         .add               = acl_add,
2336         .modify            = acl_modify,
2337         .del               = acl_delete,
2338         .rename            = acl_rename,
2339         .extended          = acl_extended,
2340         .init_context      = acl_module_init
2341 };
2342
2343 int ldb_acl_module_init(const char *version)
2344 {
2345         LDB_MODULE_CHECK_VERSION(version);
2346         return ldb_register_module(&ldb_acl_module_ops);
2347 }