source4/dsdb/samdb/ldb_modules/acl.c

   1 /*
   2   ldb database library
   3
   4   Copyright (C) Simo Sorce 2006-2008
   5   Copyright (C) Nadezhda Ivanova 2009
   6   Copyright (C) Anatoliy Atanasov  2009
   7
   8   This program is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 3 of the License, or
  11   (at your option) any later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 /*
  23  *  Name: ldb
  24  *
  25  *  Component: ldb ACL module
  26  *
  27  *  Description: Module that performs authorisation access checks based on the
  28  *               account's security context and the DACL of the object being polled.
  29  *               Only DACL checks implemented at this point
  30  *
  31  *  Authors: Nadezhda Ivanova, Anatoliy Atanasov
  32  */
  33
  34 #include "includes.h"
  35 #include "ldb_module.h"
  36 #include "auth/auth.h"
  37 #include "libcli/security/security.h"
  38 #include "dsdb/samdb/samdb.h"
  39 #include "librpc/gen_ndr/ndr_security.h"
  40 #include "param/param.h"
  41 #include "dsdb/samdb/ldb_modules/util.h"
  42 #include "dsdb/samdb/ldb_modules/schema.h"
  43 #include "lib/util/tsort.h"
  44 #include "system/kerberos.h"
  45 #include "auth/kerberos/kerberos.h"
  46
  47 struct extended_access_check_attribute {
  48         const char *oa_name;
  49         const uint32_t requires_rights;
  50 };
  51
  52 struct acl_private {
  53         bool acl_perform;
  54         const char **password_attrs;
  55 };
  56
  57 struct acl_context {
  58         struct ldb_module *module;
  59         struct ldb_request *req;
  60         bool am_system;
  61         bool allowedAttributes;
  62         bool allowedAttributesEffective;
  63         bool allowedChildClasses;
  64         bool allowedChildClassesEffective;
  65         bool sDRightsEffective;
  66         bool userPassword;
  67         const char * const *attrs;
  68         struct dsdb_schema *schema;
  69 };
  70
  71 static int acl_module_init(struct ldb_module *module)
  72 {
  73         struct ldb_context *ldb;
  74         struct acl_private *data;
  75         int ret;
  76         unsigned int i;
  77         TALLOC_CTX *mem_ctx;
  78         static const char *attrs[] = { "passwordAttribute", NULL };
  79         struct ldb_result *res;
  80         struct ldb_message *msg;
  81         struct ldb_message_element *password_attributes;
  82
  83         ldb = ldb_module_get_ctx(module);
  84
  85         ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
  86         if (ret != LDB_SUCCESS) {
  87                 ldb_debug(ldb, LDB_DEBUG_ERROR,
  88                           "acl_module_init: Unable to register control with rootdse!\n");
  89                 return ldb_operr(ldb);
  90         }
  91
  92         data = talloc(module, struct acl_private);
  93         if (data == NULL) {
  94                 return ldb_oom(ldb);
  95         }
  96
  97         data->password_attrs = NULL;
  98         data->acl_perform = lpcfg_parm_bool(ldb_get_opaque(ldb, "loadparm"),
  99                                          NULL, "acl", "perform", false);
 100         ldb_module_set_private(module, data);
 101
 102         mem_ctx = talloc_new(module);
 103         if (!mem_ctx) {
 104                 return ldb_oom(ldb);
 105         }
 106
 107         ret = dsdb_module_search_dn(module, mem_ctx, &res,
 108                                     ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
 109                                     attrs,
 110                                     DSDB_FLAG_NEXT_MODULE, NULL);
 111         if (ret != LDB_SUCCESS) {
 112                 goto done;
 113         }
 114         if (res->count == 0) {
 115                 goto done;
 116         }
 117
 118         if (res->count > 1) {
 119                 talloc_free(mem_ctx);
 120                 return LDB_ERR_CONSTRAINT_VIOLATION;
 121         }
 122
 123         msg = res->msgs[0];
 124
 125         password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
 126         if (!password_attributes) {
 127                 goto done;
 128         }
 129         data->password_attrs = talloc_array(data, const char *, password_attributes->num_values + 1);
 130         if (!data->password_attrs) {
 131                 talloc_free(mem_ctx);
 132                 return ldb_oom(ldb);
 133         }
 134         for (i=0; i < password_attributes->num_values; i++) {
 135                 data->password_attrs[i] = (const char *)password_attributes->values[i].data;
 136                 talloc_steal(data->password_attrs, password_attributes->values[i].data);
 137         }
 138         data->password_attrs[i] = NULL;
 139
 140 done:
 141         talloc_free(mem_ctx);
 142         return ldb_next_init(module);
 143 }
 144
 145 static int acl_allowedAttributes(struct ldb_module *module,
 146                                  const struct dsdb_schema *schema,
 147                                  struct ldb_message *sd_msg,
 148                                  struct ldb_message *msg,
 149                                  struct acl_context *ac)
 150 {
 151         struct ldb_message_element *oc_el;
 152         struct ldb_context *ldb = ldb_module_get_ctx(module);
 153         TALLOC_CTX *mem_ctx;
 154         const char **attr_list;
 155         int i, ret;
 156
 157         /* If we don't have a schema yet, we can't do anything... */
 158         if (schema == NULL) {
 159                 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 160                 return LDB_ERR_OPERATIONS_ERROR;
 161         }
 162
 163         /* Must remove any existing attribute */
 164         if (ac->allowedAttributes) {
 165                 ldb_msg_remove_attr(msg, "allowedAttributes");
 166         }
 167
 168         mem_ctx = talloc_new(msg);
 169         if (!mem_ctx) {
 170                 return ldb_oom(ldb);
 171         }
 172
 173         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 174         attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
 175         if (!attr_list) {
 176                 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
 177                 talloc_free(mem_ctx);
 178                 return LDB_ERR_OPERATIONS_ERROR;
 179         }
 180         if (ac->allowedAttributes) {
 181                 for (i=0; attr_list && attr_list[i]; i++) {
 182                         ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
 183                 }
 184         }
 185         if (ac->allowedAttributesEffective) {
 186                 struct security_descriptor *sd;
 187                 struct dom_sid *sid = NULL;
 188                 struct ldb_control *as_system = ldb_request_get_control(ac->req,
 189                                                                         LDB_CONTROL_AS_SYSTEM_OID);
 190
 191                 if (as_system != NULL) {
 192                         as_system->critical = 0;
 193                 }
 194
 195                 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
 196                 if (ac->am_system || as_system) {
 197                         for (i=0; attr_list && attr_list[i]; i++) {
 198                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 199                         }
 200                         return LDB_SUCCESS;
 201                 }
 202
 203                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), mem_ctx, sd_msg, &sd);
 204
 205                 if (ret != LDB_SUCCESS) {
 206                         return ret;
 207                 }
 208
 209                 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
 210                 for (i=0; attr_list && attr_list[i]; i++) {
 211                         const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
 212                                                                                         attr_list[i]);
 213                         if (!attr) {
 214                                 return ldb_operr(ldb);
 215                         }
 216                         /* remove constructed attributes */
 217                         if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
 218                             || attr->systemOnly
 219                             || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
 220                                 continue;
 221                         }
 222                         ret = acl_check_access_on_attribute(module,
 223                                                             msg,
 224                                                             sd,
 225                                                             sid,
 226                                                             SEC_ADS_WRITE_PROP,
 227                                                             attr);
 228                         if (ret == LDB_SUCCESS) {
 229                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 230                         }
 231                 }
 232         }
 233         return LDB_SUCCESS;
 234 }
 235
 236 static int acl_childClasses(struct ldb_module *module,
 237                             const struct dsdb_schema *schema,
 238                             struct ldb_message *sd_msg,
 239                             struct ldb_message *msg,
 240                             const char *attrName)
 241 {
 242         struct ldb_message_element *oc_el;
 243         struct ldb_message_element *allowedClasses;
 244         const struct dsdb_class *sclass;
 245         unsigned int i, j;
 246         int ret;
 247
 248         /* If we don't have a schema yet, we can't do anything... */
 249         if (schema == NULL) {
 250                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 251                 return LDB_ERR_OPERATIONS_ERROR;
 252         }
 253
 254         /* Must remove any existing attribute, or else confusion reins */
 255         ldb_msg_remove_attr(msg, attrName);
 256         ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
 257         if (ret != LDB_SUCCESS) {
 258                 return ret;
 259         }
 260
 261         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 262
 263         for (i=0; oc_el && i < oc_el->num_values; i++) {
 264                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 265                 if (!sclass) {
 266                         /* We don't know this class?  what is going on? */
 267                         continue;
 268                 }
 269
 270                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 271                         ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
 272                 }
 273         }
 274         if (allowedClasses->num_values > 1) {
 275                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 276                 for (i=1 ; i < allowedClasses->num_values; i++) {
 277                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 278                         struct ldb_val *val2 = &allowedClasses->values[i];
 279                         if (data_blob_cmp(val1, val2) == 0) {
 280                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
 281                                 allowedClasses->num_values--;
 282                                 i--;
 283                         }
 284                 }
 285         }
 286
 287         return LDB_SUCCESS;
 288 }
 289
 290 static int acl_check_access_on_class(struct ldb_module *module,
 291                                      const struct dsdb_schema *schema,
 292                                      TALLOC_CTX *mem_ctx,
 293                                      struct security_descriptor *sd,
 294                                      struct security_token *token,
 295                                      struct dom_sid *rp_sid,
 296                                      uint32_t access_mask,
 297                                      const char *class_name)
 298 {
 299         int ret;
 300         NTSTATUS status;
 301         uint32_t access_granted;
 302         struct object_tree *root = NULL;
 303         struct object_tree *new_node = NULL;
 304         const struct GUID *guid;
 305
 306         if (class_name != NULL) {
 307                 guid = class_schemaid_guid_by_lDAPDisplayName(schema, class_name);
 308                 if (!guid) {
 309                         DEBUG(10, ("acl_search: cannot find class %s\n",
 310                                    class_name));
 311                         goto fail;
 312                 }
 313                 if (!insert_in_object_tree(mem_ctx,
 314                                            guid, access_mask,
 315                                            &root, &new_node)) {
 316                         DEBUG(10, ("acl_search: cannot add to object tree guid\n"));
 317                         goto fail;
 318                 }
 319         }
 320
 321         status = sec_access_check_ds(sd, token,
 322                                      access_mask,
 323                                      &access_granted,
 324                                      root,
 325                                      rp_sid);
 326         if (!NT_STATUS_IS_OK(status)) {
 327                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 328         } else {
 329                 ret = LDB_SUCCESS;
 330         }
 331         return ret;
 332 fail:
 333         return ldb_operr(ldb_module_get_ctx(module));
 334 }
 335
 336 static int acl_childClassesEffective(struct ldb_module *module,
 337                                      const struct dsdb_schema *schema,
 338                                      struct ldb_message *sd_msg,
 339                                      struct ldb_message *msg,
 340                                      struct acl_context *ac)
 341 {
 342         struct ldb_message_element *oc_el;
 343         struct ldb_message_element *allowedClasses = NULL;
 344         const struct dsdb_class *sclass;
 345         struct security_descriptor *sd;
 346         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 347                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 348         struct dom_sid *sid = NULL;
 349         unsigned int i, j;
 350         int ret;
 351
 352         if (as_system != NULL) {
 353                 as_system->critical = 0;
 354         }
 355
 356         if (ac->am_system || as_system) {
 357                 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
 358         }
 359
 360         /* If we don't have a schema yet, we can't do anything... */
 361         if (schema == NULL) {
 362                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 363                 return LDB_ERR_OPERATIONS_ERROR;
 364         }
 365
 366         /* Must remove any existing attribute, or else confusion reins */
 367         ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
 368
 369         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 370         ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 371         if (ret != LDB_SUCCESS) {
 372                 return ret;
 373         }
 374
 375         sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 376         for (i=0; oc_el && i < oc_el->num_values; i++) {
 377                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 378                 if (!sclass) {
 379                         /* We don't know this class?  what is going on? */
 380                         continue;
 381                 }
 382
 383                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 384                         ret = acl_check_access_on_class(module,
 385                                                         schema,
 386                                                         msg,
 387                                                         sd,
 388                                                         acl_user_token(module),
 389                                                         sid,
 390                                                         SEC_ADS_CREATE_CHILD,
 391                                                         sclass->possibleInferiors[j]);
 392                         if (ret == LDB_SUCCESS) {
 393                                 ldb_msg_add_string(msg, "allowedChildClassesEffective",
 394                                                    sclass->possibleInferiors[j]);
 395                         }
 396                 }
 397         }
 398         allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
 399         if (!allowedClasses) {
 400                 return LDB_SUCCESS;
 401         }
 402
 403         if (allowedClasses->num_values > 1) {
 404                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 405                 for (i=1 ; i < allowedClasses->num_values; i++) {
 406                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 407                         struct ldb_val *val2 = &allowedClasses->values[i];
 408                         if (data_blob_cmp(val1, val2) == 0) {
 409                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
 410                                 allowedClasses->num_values--;
 411                                 i--;
 412                         }
 413                 }
 414         }
 415         return LDB_SUCCESS;
 416 }
 417
 418 static int acl_sDRightsEffective(struct ldb_module *module,
 419                                  struct ldb_message *sd_msg,
 420                                  struct ldb_message *msg,
 421                                  struct acl_context *ac)
 422 {
 423         struct ldb_message_element *rightsEffective;
 424         int ret;
 425         struct security_descriptor *sd;
 426         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 427                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 428         struct dom_sid *sid = NULL;
 429         uint32_t flags = 0;
 430
 431         if (as_system != NULL) {
 432                 as_system->critical = 0;
 433         }
 434
 435         /* Must remove any existing attribute, or else confusion reins */
 436         ldb_msg_remove_attr(msg, "sDRightsEffective");
 437         ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
 438         if (ret != LDB_SUCCESS) {
 439                 return ret;
 440         }
 441         if (ac->am_system || as_system) {
 442                 flags = SECINFO_OWNER | SECINFO_GROUP |  SECINFO_SACL |  SECINFO_DACL;
 443         }
 444         else {
 445                 /* Get the security descriptor from the message */
 446                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 447                 if (ret != LDB_SUCCESS) {
 448                         return ret;
 449                 }
 450                 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 451                 ret = acl_check_access_on_attribute(module,
 452                                                     msg,
 453                                                     sd,
 454                                                     sid,
 455                                                     SEC_STD_WRITE_OWNER,
 456                                                     NULL);
 457                 if (ret == LDB_SUCCESS) {
 458                         flags |= SECINFO_OWNER | SECINFO_GROUP;
 459                 }
 460                 ret = acl_check_access_on_attribute(module,
 461                                                     msg,
 462                                                     sd,
 463                                                     sid,
 464                                                     SEC_STD_WRITE_DAC,
 465                                                     NULL);
 466                 if (ret == LDB_SUCCESS) {
 467                         flags |= SECINFO_DACL;
 468                 }
 469                 ret = acl_check_access_on_attribute(module,
 470                                                     msg,
 471                                                     sd,
 472                                                     sid,
 473                                                     SEC_FLAG_SYSTEM_SECURITY,
 474                                                     NULL);
 475                 if (ret == LDB_SUCCESS) {
 476                         flags |= SECINFO_SACL;
 477                 }
 478         }
 479         return samdb_msg_add_uint(ldb_module_get_ctx(module), msg, msg,
 480                                   "sDRightsEffective", flags);
 481 }
 482
 483 static int acl_validate_spn_value(TALLOC_CTX *mem_ctx,
 484                                   struct ldb_context *ldb,
 485                                   const char *spn_value,
 486                                   uint32_t userAccountControl,
 487                                   const char *samAccountName,
 488                                   const char *dnsHostName,
 489                                   const char *netbios_name,
 490                                   const char *ntds_guid)
 491 {
 492         int ret;
 493         krb5_context krb_ctx;
 494         krb5_error_code kerr;
 495         krb5_principal principal;
 496         char *instanceName;
 497         char *serviceType;
 498         char *serviceName;
 499         const char *forest_name = samdb_forest_name(ldb, mem_ctx);
 500         const char *base_domain = samdb_default_domain_name(ldb, mem_ctx);
 501         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
 502                                                           struct loadparm_context);
 503         bool is_dc = (userAccountControl & UF_SERVER_TRUST_ACCOUNT) ||
 504                 (userAccountControl & UF_PARTIAL_SECRETS_ACCOUNT);
 505
 506         if (strcasecmp_m(spn_value, samAccountName) == 0) {
 507                 /* MacOS X sets this value, and setting an SPN of your
 508                  * own samAccountName is both pointless and safe */
 509                 return LDB_SUCCESS;
 510         }
 511
 512         kerr = smb_krb5_init_context_basic(mem_ctx,
 513                                            lp_ctx,
 514                                            &krb_ctx);
 515         if (kerr != 0) {
 516                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 517                                  "Could not initialize kerberos context.");
 518         }
 519
 520         ret = krb5_parse_name(krb_ctx, spn_value, &principal);
 521         if (ret) {
 522                 krb5_free_context(krb_ctx);
 523                 return LDB_ERR_CONSTRAINT_VIOLATION;
 524         }
 525
 526         if (principal->name.name_string.len < 2) {
 527                 goto fail;
 528         }
 529
 530         instanceName = principal->name.name_string.val[1];
 531         serviceType = principal->name.name_string.val[0];
 532         if (principal->name.name_string.len == 3) {
 533                 serviceName = principal->name.name_string.val[2];
 534         } else {
 535                 serviceName = NULL;
 536         }
 537
 538         if (serviceName) {
 539                 if (!is_dc) {
 540                         goto fail;
 541                 }
 542                 if (strcasecmp(serviceType, "ldap") == 0) {
 543                         if (strcasecmp(serviceName, netbios_name) != 0 &&
 544                             strcasecmp(serviceName, forest_name) != 0) {
 545                                 goto fail;
 546                         }
 547
 548                 } else if (strcasecmp(serviceType, "gc") == 0) {
 549                         if (strcasecmp(serviceName, forest_name) != 0) {
 550                                 goto fail;
 551                         }
 552                 } else {
 553                         if (strcasecmp(serviceName, base_domain) != 0 &&
 554                             strcasecmp(serviceName, netbios_name) != 0) {
 555                                 goto fail;
 556                         }
 557                 }
 558         }
 559         /* instanceName can be samAccountName without $ or dnsHostName
 560          * or "ntds_guid._msdcs.forest_domain for DC objects */
 561         if (strlen(instanceName) == (strlen(samAccountName) - 1)
 562             && strncasecmp(instanceName, samAccountName, strlen(samAccountName) - 1) == 0) {
 563                 goto success;
 564         } else if (dnsHostName != NULL && strcasecmp(instanceName, dnsHostName) == 0) {
 565                 goto success;
 566         } else if (is_dc) {
 567                 const char *guid_str;
 568                 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
 569                                            ntds_guid,
 570                                            forest_name);
 571                 if (strcasecmp(instanceName, guid_str) == 0) {
 572                         goto success;
 573                 }
 574         }
 575
 576 fail:
 577         krb5_free_principal(krb_ctx, principal);
 578         krb5_free_context(krb_ctx);
 579         return LDB_ERR_CONSTRAINT_VIOLATION;
 580
 581 success:
 582         krb5_free_principal(krb_ctx, principal);
 583         krb5_free_context(krb_ctx);
 584         return LDB_SUCCESS;
 585 }
 586
 587 static int acl_check_spn(TALLOC_CTX *mem_ctx,
 588                          struct ldb_module *module,
 589                          struct ldb_request *req,
 590                          struct security_descriptor *sd,
 591                          struct dom_sid *sid,
 592                          const struct GUID *oc_guid,
 593                          const struct dsdb_attribute *attr)
 594 {
 595         int ret;
 596         unsigned int i;
 597         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 598         struct ldb_context *ldb = ldb_module_get_ctx(module);
 599         struct ldb_result *acl_res;
 600         struct ldb_result *netbios_res;
 601         struct ldb_message_element *el;
 602         struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
 603         uint32_t userAccountControl;
 604         const char *samAccountName;
 605         const char *dnsHostName;
 606         const char *netbios_name;
 607         struct GUID ntds;
 608         char *ntds_guid = NULL;
 609
 610         static const char *acl_attrs[] = {
 611                 "samAccountName",
 612                 "dnsHostName",
 613                 "userAccountControl",
 614                 NULL
 615         };
 616         static const char *netbios_attrs[] = {
 617                 "nETBIOSName",
 618                 NULL
 619         };
 620
 621         /* if we have wp, we can do whatever we like */
 622         if (acl_check_access_on_attribute(module,
 623                                           tmp_ctx,
 624                                           sd,
 625                                           sid,
 626                                           SEC_ADS_WRITE_PROP,
 627                                           attr) == LDB_SUCCESS) {
 628                 talloc_free(tmp_ctx);
 629                 return LDB_SUCCESS;
 630         }
 631
 632         ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 633                                        GUID_DRS_VALIDATE_SPN,
 634                                        SEC_ADS_SELF_WRITE,
 635                                        sid);
 636
 637         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 638                 dsdb_acl_debug(sd, acl_user_token(module),
 639                                req->op.mod.message->dn,
 640                                true,
 641                                10);
 642                 talloc_free(tmp_ctx);
 643                 return ret;
 644         }
 645
 646         ret = dsdb_module_search_dn(module, tmp_ctx,
 647                                     &acl_res, req->op.mod.message->dn,
 648                                     acl_attrs,
 649                                     DSDB_FLAG_NEXT_MODULE |
 650                                     DSDB_SEARCH_SHOW_DELETED, req);
 651         if (ret != LDB_SUCCESS) {
 652                 talloc_free(tmp_ctx);
 653                 return ret;
 654         }
 655
 656         userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
 657         dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
 658         samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
 659
 660         ret = dsdb_module_search(module, tmp_ctx,
 661                                  &netbios_res, partitions_dn,
 662                                  LDB_SCOPE_ONELEVEL,
 663                                  netbios_attrs,
 664                                  DSDB_FLAG_NEXT_MODULE,
 665                                  req,
 666                                  "(ncName=%s)",
 667                                  ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
 668
 669         netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
 670
 671         el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
 672         if (!el) {
 673                 talloc_free(tmp_ctx);
 674                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 675                                          "Error finding element for servicePrincipalName.");
 676         }
 677
 678         /* NTDSDSA objectGuid of object we are checking SPN for */
 679         if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
 680                 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
 681                                                              req->op.mod.message->dn, &ntds, req);
 682                 if (ret != LDB_SUCCESS) {
 683                         ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
 684                                                ldb_dn_get_linearized(req->op.mod.message->dn),
 685                                                ldb_strerror(ret));
 686                         talloc_free(tmp_ctx);
 687                         return LDB_ERR_OPERATIONS_ERROR;
 688                 }
 689                 ntds_guid = GUID_string(tmp_ctx, &ntds);
 690         }
 691
 692         for (i=0; i < el->num_values; i++) {
 693                 ret = acl_validate_spn_value(tmp_ctx,
 694                                              ldb,
 695                                              (char *)el->values[i].data,
 696                                              userAccountControl,
 697                                              samAccountName,
 698                                              dnsHostName,
 699                                              netbios_name,
 700                                              ntds_guid);
 701                 if (ret != LDB_SUCCESS) {
 702                         talloc_free(tmp_ctx);
 703                         return ret;
 704                 }
 705         }
 706         talloc_free(tmp_ctx);
 707         return LDB_SUCCESS;
 708 }
 709
 710 static int acl_add(struct ldb_module *module, struct ldb_request *req)
 711 {
 712         int ret;
 713         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
 714         struct ldb_context *ldb;
 715         const struct dsdb_schema *schema;
 716         struct ldb_message_element *oc_el;
 717         const struct GUID *guid;
 718         struct ldb_dn *nc_root;
 719         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 720
 721         if (as_system != NULL) {
 722                 as_system->critical = 0;
 723         }
 724
 725         if (dsdb_module_am_system(module) || as_system) {
 726                 return ldb_next_request(module, req);
 727         }
 728         if (ldb_dn_is_special(req->op.add.message->dn)) {
 729                 return ldb_next_request(module, req);
 730         }
 731
 732         ldb = ldb_module_get_ctx(module);
 733
 734         /* Creating an NC. There is probably something we should do here,
 735          * but we will establish that later */
 736
 737         ret = dsdb_find_nc_root(ldb, req, req->op.add.message->dn, &nc_root);
 738         if (ret != LDB_SUCCESS) {
 739                 return ret;
 740         }
 741         if (ldb_dn_compare(nc_root, req->op.add.message->dn) == 0) {
 742                 talloc_free(nc_root);
 743                 return ldb_next_request(module, req);
 744         }
 745         talloc_free(nc_root);
 746
 747         schema = dsdb_get_schema(ldb, req);
 748         if (!schema) {
 749                 return ldb_operr(ldb);
 750         }
 751
 752         oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
 753         if (!oc_el || oc_el->num_values == 0) {
 754                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
 755                                        "acl: unable to find objectClass on %s\n",
 756                                        ldb_dn_get_linearized(req->op.add.message->dn));
 757                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 758         }
 759
 760         guid = class_schemaid_guid_by_lDAPDisplayName(schema,
 761                                                       (char *)oc_el->values[oc_el->num_values-1].data);
 762         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid, req);
 763         if (ret != LDB_SUCCESS) {
 764                 return ret;
 765         }
 766         return ldb_next_request(module, req);
 767 }
 768
 769 /* ckecks if modifications are allowed on "Member" attribute */
 770 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
 771                                      struct ldb_module *module,
 772                                      struct ldb_request *req,
 773                                      struct security_descriptor *sd,
 774                                      struct dom_sid *sid,
 775                                      const struct GUID *oc_guid,
 776                                      const struct dsdb_attribute *attr)
 777 {
 778         int ret;
 779         unsigned int i;
 780         struct ldb_context *ldb = ldb_module_get_ctx(module);
 781         struct ldb_dn *user_dn;
 782         struct ldb_message_element *member_el;
 783         /* if we have wp, we can do whatever we like */
 784         if (acl_check_access_on_attribute(module,
 785                                           mem_ctx,
 786                                           sd,
 787                                           sid,
 788                                           SEC_ADS_WRITE_PROP,
 789                                           attr) == LDB_SUCCESS) {
 790                 return LDB_SUCCESS;
 791         }
 792         /* if we are adding/deleting ourselves, check for self membership */
 793         ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
 794                                   &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
 795                                   &user_dn);
 796         if (ret != LDB_SUCCESS) {
 797                 return ret;
 798         }
 799         member_el = ldb_msg_find_element(req->op.mod.message, "member");
 800         if (!member_el) {
 801                 return ldb_operr(ldb);
 802         }
 803         /* user can only remove oneself */
 804         if (member_el->num_values == 0) {
 805                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 806         }
 807         for (i = 0; i < member_el->num_values; i++) {
 808                 if (strcasecmp((const char *)member_el->values[i].data,
 809                                ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
 810                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 811                 }
 812         }
 813         ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
 814                                        GUID_DRS_SELF_MEMBERSHIP,
 815                                        SEC_ADS_SELF_WRITE,
 816                                        sid);
 817         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 818                 dsdb_acl_debug(sd, acl_user_token(module),
 819                                req->op.mod.message->dn,
 820                                true,
 821                                10);
 822         }
 823         return ret;
 824 }
 825
 826 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
 827                                      struct ldb_module *module,
 828                                      struct ldb_request *req,
 829                                      struct security_descriptor *sd,
 830                                      struct dom_sid *sid,
 831                                      const struct GUID *oc_guid,
 832                                      bool userPassword)
 833 {
 834         int ret = LDB_SUCCESS;
 835         unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
 836         struct ldb_message_element *el;
 837         struct ldb_message *msg;
 838         const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
 839                                         "unicodePwd", "dBCSPwd", NULL }, **l;
 840         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 841
 842         msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
 843         if (msg == NULL) {
 844                 return ldb_module_oom(module);
 845         }
 846         for (l = passwordAttrs; *l != NULL; l++) {
 847                 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
 848                         continue;
 849                 }
 850
 851                 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
 852                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
 853                                 ++del_attr_cnt;
 854                         }
 855                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
 856                                 ++add_attr_cnt;
 857                         }
 858                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
 859                                 ++rep_attr_cnt;
 860                         }
 861                         ldb_msg_remove_element(msg, el);
 862                 }
 863         }
 864
 865         /* single deletes will be handled by the "password_hash" LDB module
 866          * later in the stack, so we let it though here */
 867         if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
 868                 talloc_free(tmp_ctx);
 869                 return LDB_SUCCESS;
 870         }
 871
 872         if (ldb_request_get_control(req,
 873                                     DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
 874                 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
 875                  * have a user password change and not a set as the message
 876                  * looks like. In it's value blob it contains the NT and/or LM
 877                  * hash of the old password specified by the user.
 878                  * This control is used by the SAMR and "kpasswd" password
 879                  * change mechanisms. */
 880                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 881                                                GUID_DRS_USER_CHANGE_PASSWORD,
 882                                                SEC_ADS_CONTROL_ACCESS,
 883                                                sid);
 884         }
 885         else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
 886                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 887                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
 888                                                SEC_ADS_CONTROL_ACCESS,
 889                                                sid);
 890         }
 891         else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
 892                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 893                                                GUID_DRS_USER_CHANGE_PASSWORD,
 894                                                SEC_ADS_CONTROL_ACCESS,
 895                                                sid);
 896                 /* Very strange, but we get constraint violation in this case */
 897                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 898                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
 899                 }
 900         }
 901         if (ret != LDB_SUCCESS) {
 902                 dsdb_acl_debug(sd, acl_user_token(module),
 903                                req->op.mod.message->dn,
 904                                true,
 905                                10);
 906         }
 907         talloc_free(tmp_ctx);
 908         return ret;
 909 }
 910
 911 static const struct GUID *get_oc_guid_from_message(const struct dsdb_schema *schema,
 912                                                    struct ldb_message *msg)
 913 {
 914         struct ldb_message_element *oc_el;
 915         const struct dsdb_class *object_class;
 916
 917         oc_el = ldb_msg_find_element(msg, "objectClass");
 918         if (!oc_el) {
 919                 return NULL;
 920         }
 921
 922         object_class = get_last_structural_class(schema, oc_el);
 923         if (object_class == NULL) {
 924                 return NULL;
 925         }
 926
 927         return &object_class->schemaIDGUID;
 928 }
 929
 930
 931 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
 932 {
 933         int ret;
 934         struct ldb_context *ldb = ldb_module_get_ctx(module);
 935         const struct dsdb_schema *schema;
 936         unsigned int i;
 937         const struct GUID *guid;
 938         uint32_t access_granted;
 939         struct object_tree *root = NULL;
 940         struct object_tree *new_node = NULL;
 941         NTSTATUS status;
 942         struct ldb_result *acl_res;
 943         struct security_descriptor *sd;
 944         struct dom_sid *sid = NULL;
 945         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 946         bool userPassword = dsdb_user_password_support(module, req, req);
 947         TALLOC_CTX *tmp_ctx = talloc_new(req);
 948         static const char *acl_attrs[] = {
 949                 "nTSecurityDescriptor",
 950                 "objectClass",
 951                 "objectSid",
 952                 NULL
 953         };
 954
 955         if (as_system != NULL) {
 956                 as_system->critical = 0;
 957         }
 958
 959         /* Don't print this debug statement if elements[0].name is going to be NULL */
 960         if(req->op.mod.message->num_elements > 0)
 961         {
 962                 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
 963         }
 964         if (dsdb_module_am_system(module) || as_system) {
 965                 return ldb_next_request(module, req);
 966         }
 967         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 968                 return ldb_next_request(module, req);
 969         }
 970         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
 971                                     acl_attrs,
 972                                     DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED,
 973                                     req);
 974
 975         if (ret != LDB_SUCCESS) {
 976                 goto fail;
 977         }
 978
 979         schema = dsdb_get_schema(ldb, tmp_ctx);
 980         if (!schema) {
 981                 ret = LDB_ERR_OPERATIONS_ERROR;
 982                 goto fail;
 983         }
 984
 985         ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
 986         if (ret != LDB_SUCCESS) {
 987                 talloc_free(tmp_ctx);
 988                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 989                                  "acl_modify: Error retrieving security descriptor.");
 990         }
 991         /* Theoretically we pass the check if the object has no sd */
 992         if (!sd) {
 993                 goto success;
 994         }
 995
 996         guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
 997         if (!guid) {
 998                 talloc_free(tmp_ctx);
 999                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1000                                  "acl_modify: Error retrieving object class GUID.");
1001         }
1002         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1003         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1004                                    &root, &new_node)) {
1005                 talloc_free(tmp_ctx);
1006                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1007                                  "acl_modify: Error adding new node in object tree.");
1008         }
1009         for (i=0; i < req->op.mod.message->num_elements; i++){
1010                 const struct dsdb_attribute *attr;
1011                 attr = dsdb_attribute_by_lDAPDisplayName(schema,
1012                                                          req->op.mod.message->elements[i].name);
1013
1014                 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
1015                         status = sec_access_check_ds(sd, acl_user_token(module),
1016                                              SEC_STD_WRITE_DAC,
1017                                              &access_granted,
1018                                              NULL,
1019                                              sid);
1020
1021                         if (!NT_STATUS_IS_OK(status)) {
1022                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1023                                                        "Object %s has no write dacl access\n",
1024                                                        ldb_dn_get_linearized(req->op.mod.message->dn));
1025                                 dsdb_acl_debug(sd,
1026                                                acl_user_token(module),
1027                                                req->op.mod.message->dn,
1028                                                true,
1029                                                10);
1030                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1031                                 goto fail;
1032                         }
1033                 }
1034                 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
1035                         ret = acl_check_self_membership(tmp_ctx,
1036                                                         module,
1037                                                         req,
1038                                                         sd,
1039                                                         sid,
1040                                                         guid,
1041                                                         attr);
1042                         if (ret != LDB_SUCCESS) {
1043                                 goto fail;
1044                         }
1045                 }
1046                 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
1047                         /* this one is not affected by any rights, we should let it through
1048                            so that passwords_hash returns the correct error */
1049                         continue;
1050                 }
1051                 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
1052                          (userPassword && ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0) ||
1053                          ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
1054                         ret = acl_check_password_rights(tmp_ctx,
1055                                                         module,
1056                                                         req,
1057                                                         sd,
1058                                                         sid,
1059                                                         guid,
1060                                                         userPassword);
1061                         if (ret != LDB_SUCCESS) {
1062                                 goto fail;
1063                         }
1064                 } else if (ldb_attr_cmp("servicePrincipalName", req->op.mod.message->elements[i].name) == 0) {
1065                         ret = acl_check_spn(tmp_ctx,
1066                                             module,
1067                                             req,
1068                                             sd,
1069                                             sid,
1070                                             guid,
1071                                             attr);
1072                         if (ret != LDB_SUCCESS) {
1073                                 goto fail;
1074                         }
1075                 } else {
1076
1077                 /* This basic attribute existence check with the right errorcode
1078                  * is needed since this module is the first one which requests
1079                  * schema attribute information.
1080                  * The complete attribute checking is done in the
1081                  * "objectclass_attrs" module behind this one.
1082                  */
1083                         if (!attr) {
1084                                 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
1085                                                        req->op.mod.message->elements[i].name,
1086                                                ldb_dn_get_linearized(req->op.mod.message->dn));
1087                                 ret =  LDB_ERR_NO_SUCH_ATTRIBUTE;
1088                                 goto fail;
1089                         }
1090                         if (!insert_in_object_tree(tmp_ctx,
1091                                                    &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
1092                                                    &new_node, &new_node)) {
1093                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1094                                                        "acl_modify: cannot add to object tree securityGUID\n");
1095                                 ret = LDB_ERR_OPERATIONS_ERROR;
1096                                 goto fail;
1097                         }
1098
1099                         if (!insert_in_object_tree(tmp_ctx,
1100                                                    &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
1101                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1102                                                        "acl_modify: cannot add to object tree attributeGUID\n");
1103                                 ret = LDB_ERR_OPERATIONS_ERROR;
1104                                 goto fail;
1105                         }
1106                 }
1107         }
1108
1109         if (root->num_of_children > 0) {
1110                 status = sec_access_check_ds(sd, acl_user_token(module),
1111                                              SEC_ADS_WRITE_PROP,
1112                                              &access_granted,
1113                                              root,
1114                                              sid);
1115
1116                 if (!NT_STATUS_IS_OK(status)) {
1117                         ldb_asprintf_errstring(ldb_module_get_ctx(module),
1118                                                "Object %s has no write property access\n",
1119                                                ldb_dn_get_linearized(req->op.mod.message->dn));
1120                         dsdb_acl_debug(sd,
1121                                        acl_user_token(module),
1122                                        req->op.mod.message->dn,
1123                                        true,
1124                                        10);
1125                         ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1126                         goto fail;
1127                 }
1128         }
1129
1130 success:
1131         talloc_free(tmp_ctx);
1132         return ldb_next_request(module, req);
1133 fail:
1134         talloc_free(tmp_ctx);
1135         return ret;
1136 }
1137
1138 /* similar to the modify for the time being.
1139  * We need to consider the special delete tree case, though - TODO */
1140 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1141 {
1142         int ret;
1143         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
1144         struct ldb_context *ldb;
1145         struct ldb_dn *nc_root;
1146         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1147
1148         if (as_system != NULL) {
1149                 as_system->critical = 0;
1150         }
1151
1152         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1153         if (dsdb_module_am_system(module) || as_system) {
1154                 return ldb_next_request(module, req);
1155         }
1156         if (ldb_dn_is_special(req->op.del.dn)) {
1157                 return ldb_next_request(module, req);
1158         }
1159
1160         ldb = ldb_module_get_ctx(module);
1161
1162         /* Make sure we aren't deleting a NC */
1163
1164         ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1165         if (ret != LDB_SUCCESS) {
1166                 return ret;
1167         }
1168         if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1169                 talloc_free(nc_root);
1170                 DEBUG(10,("acl:deleting a NC\n"));
1171                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1172                 return ldb_module_done(req, NULL, NULL,
1173                                        LDB_ERR_UNWILLING_TO_PERFORM);
1174         }
1175         talloc_free(nc_root);
1176
1177         /* First check if we have delete object right */
1178         ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn,
1179                                              SEC_STD_DELETE, NULL, req);
1180         if (ret == LDB_SUCCESS) {
1181                 return ldb_next_request(module, req);
1182         }
1183
1184         /* Nope, we don't have delete object. Lets check if we have delete
1185          * child on the parent */
1186         ret = dsdb_module_check_access_on_dn(module, req, parent,
1187                                              SEC_ADS_DELETE_CHILD, NULL, req);
1188         if (ret != LDB_SUCCESS) {
1189                 return ret;
1190         }
1191
1192         return ldb_next_request(module, req);
1193 }
1194
1195 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1196 {
1197         int ret;
1198         struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
1199         struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
1200         const struct dsdb_schema *schema;
1201         struct ldb_context *ldb;
1202         struct security_descriptor *sd = NULL;
1203         struct dom_sid *sid = NULL;
1204         struct ldb_result *acl_res;
1205         const struct GUID *guid;
1206         struct ldb_dn *nc_root;
1207         struct object_tree *root = NULL;
1208         struct object_tree *new_node = NULL;
1209         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1210         TALLOC_CTX *tmp_ctx = talloc_new(req);
1211         NTSTATUS status;
1212         uint32_t access_granted;
1213         const char *rdn_name;
1214         static const char *acl_attrs[] = {
1215                 "nTSecurityDescriptor",
1216                 "objectClass",
1217                 "objectSid",
1218                 NULL
1219         };
1220
1221         if (as_system != NULL) {
1222                 as_system->critical = 0;
1223         }
1224
1225         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1226         if (dsdb_module_am_system(module) || as_system) {
1227                 return ldb_next_request(module, req);
1228         }
1229         if (ldb_dn_is_special(req->op.rename.olddn)) {
1230                 return ldb_next_request(module, req);
1231         }
1232
1233         ldb = ldb_module_get_ctx(module);
1234
1235         /* Make sure we aren't renaming/moving a NC */
1236
1237         ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1238         if (ret != LDB_SUCCESS) {
1239                 return ret;
1240         }
1241         if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1242                 talloc_free(nc_root);
1243                 DEBUG(10,("acl:renaming/moving a NC\n"));
1244                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1245                 return ldb_module_done(req, NULL, NULL,
1246                                        LDB_ERR_UNWILLING_TO_PERFORM);
1247         }
1248         talloc_free(nc_root);
1249
1250         /* Look for the parent */
1251
1252         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1253                                     req->op.rename.olddn, acl_attrs,
1254                                     DSDB_FLAG_NEXT_MODULE |
1255                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1256         /* we sould be able to find the parent */
1257         if (ret != LDB_SUCCESS) {
1258                 DEBUG(10,("acl: failed to find object %s\n",
1259                           ldb_dn_get_linearized(req->op.rename.olddn)));
1260                 talloc_free(tmp_ctx);
1261                 return ret;
1262         }
1263
1264         schema = dsdb_get_schema(ldb, acl_res);
1265         if (!schema) {
1266                 talloc_free(tmp_ctx);
1267                 return ldb_operr(ldb);
1268         }
1269
1270         guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
1271         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1272                                    &root, &new_node)) {
1273                 talloc_free(tmp_ctx);
1274                 return ldb_operr(ldb);
1275         };
1276
1277         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1278                                                           "name");
1279         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1280                                    &new_node, &new_node)) {
1281                 talloc_free(tmp_ctx);
1282                 return ldb_operr(ldb);
1283         };
1284
1285         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1286         if (rdn_name == NULL) {
1287                 talloc_free(tmp_ctx);
1288                 return ldb_operr(ldb);
1289         }
1290         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1291                                                           rdn_name);
1292         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1293                                    &new_node, &new_node)) {
1294                 talloc_free(tmp_ctx);
1295                 return ldb_operr(ldb);
1296         };
1297
1298         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1299
1300         if (ret != LDB_SUCCESS) {
1301                 talloc_free(tmp_ctx);
1302                 return ldb_operr(ldb);
1303         }
1304         /* Theoretically we pass the check if the object has no sd */
1305         if (!sd) {
1306                 talloc_free(tmp_ctx);
1307                 return LDB_SUCCESS;
1308         }
1309         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1310         status = sec_access_check_ds(sd, acl_user_token(module),
1311                                      SEC_ADS_WRITE_PROP,
1312                                      &access_granted,
1313                                      root,
1314                                      sid);
1315
1316         if (!NT_STATUS_IS_OK(status)) {
1317                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1318                                        "Object %s has no wp on name\n",
1319                                        ldb_dn_get_linearized(req->op.rename.olddn));
1320                 dsdb_acl_debug(sd,
1321                           acl_user_token(module),
1322                           req->op.rename.olddn,
1323                           true,
1324                           10);
1325                 talloc_free(tmp_ctx);
1326                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1327         }
1328
1329         if (ldb_dn_compare(oldparent, newparent) == 0) {
1330                 /* regular rename, not move, nothing more to do */
1331                 talloc_free(tmp_ctx);
1332                 return ldb_next_request(module, req);
1333         }
1334
1335         /* new parent should have create child */
1336         root = NULL;
1337         new_node = NULL;
1338         guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
1339         if (!guid) {
1340                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1341                                        "acl:renamed object has no object class\n");
1342                 talloc_free(tmp_ctx);
1343                 return ldb_module_done(req, NULL, NULL,  LDB_ERR_OPERATIONS_ERROR);
1344         }
1345
1346         ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid, req);
1347         if (ret != LDB_SUCCESS) {
1348                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1349                                        "acl:access_denied renaming %s",
1350                                        ldb_dn_get_linearized(req->op.rename.olddn));
1351                 talloc_free(tmp_ctx);
1352                 return ret;
1353         }
1354         /* do we have delete object on the object? */
1355
1356         status = sec_access_check_ds(sd, acl_user_token(module),
1357                                      SEC_STD_DELETE,
1358                                      &access_granted,
1359                                      NULL,
1360                                      sid);
1361
1362         if (NT_STATUS_IS_OK(status)) {
1363                 talloc_free(tmp_ctx);
1364                 return ldb_next_request(module, req);
1365         }
1366         /* what about delete child on the current parent */
1367         ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL, req);
1368         if (ret != LDB_SUCCESS) {
1369                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1370                                        "acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn));
1371                 talloc_free(tmp_ctx);
1372                 return ldb_module_done(req, NULL, NULL, ret);
1373         }
1374
1375         talloc_free(tmp_ctx);
1376
1377         return ldb_next_request(module, req);
1378 }
1379
1380 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1381 {
1382         struct acl_context *ac;
1383         struct acl_private *data;
1384         struct ldb_result *acl_res;
1385         static const char *acl_attrs[] = {
1386                 "objectClass",
1387                 "nTSecurityDescriptor",
1388                 "objectSid",
1389                 NULL
1390         };
1391         int ret;
1392         unsigned int i;
1393
1394         ac = talloc_get_type(req->context, struct acl_context);
1395         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1396         if (!ares) {
1397                 return ldb_module_done(ac->req, NULL, NULL,
1398                                        LDB_ERR_OPERATIONS_ERROR);
1399         }
1400         if (ares->error != LDB_SUCCESS) {
1401                 return ldb_module_done(ac->req, ares->controls,
1402                                        ares->response, ares->error);
1403         }
1404
1405         switch (ares->type) {
1406         case LDB_REPLY_ENTRY:
1407                 if (ac->allowedAttributes
1408                     || ac->allowedChildClasses
1409                     || ac->allowedChildClassesEffective
1410                     || ac->allowedAttributesEffective
1411                     || ac->sDRightsEffective) {
1412                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1413                                                     acl_attrs,
1414                                                     DSDB_FLAG_NEXT_MODULE |
1415                                                     DSDB_SEARCH_SHOW_DELETED, req);
1416                         if (ret != LDB_SUCCESS) {
1417                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1418                         }
1419                         if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1420                                 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1421                                 if (ret != LDB_SUCCESS) {
1422                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1423                                 }
1424                         }
1425                         if (ac->allowedChildClasses) {
1426                                 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1427                                                        ares->message, "allowedChildClasses");
1428                                 if (ret != LDB_SUCCESS) {
1429                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1430                                 }
1431                         }
1432                         if (ac->allowedChildClassesEffective) {
1433                                 ret = acl_childClassesEffective(ac->module, ac->schema,
1434                                                                 acl_res->msgs[0], ares->message, ac);
1435                                 if (ret != LDB_SUCCESS) {
1436                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1437                                 }
1438                         }
1439                         if (ac->sDRightsEffective) {
1440                                 ret = acl_sDRightsEffective(ac->module,
1441                                                             acl_res->msgs[0], ares->message, ac);
1442                                 if (ret != LDB_SUCCESS) {
1443                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1444                                 }
1445                         }
1446                 }
1447                 if (data && data->password_attrs) {
1448                         if (!ac->am_system) {
1449                                 for (i = 0; data->password_attrs[i]; i++) {
1450                                         if ((!ac->userPassword) &&
1451                                             (ldb_attr_cmp(data->password_attrs[i],
1452                                                           "userPassword") == 0))
1453                                                 continue;
1454
1455                                         ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1456                                 }
1457                         }
1458                 }
1459                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1460
1461         case LDB_REPLY_REFERRAL:
1462                 return ldb_module_send_referral(ac->req, ares->referral);
1463
1464         case LDB_REPLY_DONE:
1465                 return ldb_module_done(ac->req, ares->controls,
1466                                        ares->response, LDB_SUCCESS);
1467
1468         }
1469         return LDB_SUCCESS;
1470 }
1471
1472 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1473 {
1474         struct ldb_context *ldb;
1475         struct acl_context *ac;
1476         struct ldb_request *down_req;
1477         struct acl_private *data;
1478         int ret;
1479         unsigned int i;
1480
1481         ldb = ldb_module_get_ctx(module);
1482
1483         ac = talloc_zero(req, struct acl_context);
1484         if (ac == NULL) {
1485                 return ldb_oom(ldb);
1486         }
1487         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1488
1489         ac->module = module;
1490         ac->req = req;
1491         ac->am_system = dsdb_module_am_system(module);
1492         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1493         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1494         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1495         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1496         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1497         ac->userPassword = dsdb_user_password_support(module, ac, req);
1498         ac->schema = dsdb_get_schema(ldb, ac);
1499
1500         /* replace any attributes in the parse tree that are private,
1501            so we don't allow a search for 'userPassword=penguin',
1502            just as we would not allow that attribute to be returned */
1503         if (ac->am_system) {
1504                 /* FIXME: We should copy the tree and keep the original unmodified. */
1505                 /* remove password attributes */
1506                 if (data && data->password_attrs) {
1507                         for (i = 0; data->password_attrs[i]; i++) {
1508                                 if ((!ac->userPassword) &&
1509                                     (ldb_attr_cmp(data->password_attrs[i],
1510                                                   "userPassword") == 0))
1511                                                 continue;
1512
1513                                 ldb_parse_tree_attr_replace(req->op.search.tree,
1514                                                             data->password_attrs[i],
1515                                                             "kludgeACLredactedattribute");
1516                         }
1517                 }
1518         }
1519         ret = ldb_build_search_req_ex(&down_req,
1520                                       ldb, ac,
1521                                       req->op.search.base,
1522                                       req->op.search.scope,
1523                                       req->op.search.tree,
1524                                       req->op.search.attrs,
1525                                       req->controls,
1526                                       ac, acl_search_callback,
1527                                       req);
1528         LDB_REQ_SET_LOCATION(down_req);
1529         if (ret != LDB_SUCCESS) {
1530                 return ret;
1531         }
1532         /* perform the search */
1533         return ldb_next_request(module, down_req);
1534 }
1535
1536 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1537 {
1538         struct ldb_context *ldb = ldb_module_get_ctx(module);
1539         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1540
1541         /* allow everybody to read the sequence number */
1542         if (strcmp(req->op.extended.oid,
1543                    LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1544                 return ldb_next_request(module, req);
1545         }
1546
1547         if (dsdb_module_am_system(module) ||
1548             dsdb_module_am_administrator(module) || as_system) {
1549                 return ldb_next_request(module, req);
1550         } else {
1551                 ldb_asprintf_errstring(ldb,
1552                                        "acl_extended: "
1553                                        "attempted database modify not permitted. "
1554                                        "User %s is not SYSTEM or an administrator",
1555                                        acl_user_name(req, module));
1556                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1557         }
1558 }
1559
1560 static const struct ldb_module_ops ldb_acl_module_ops = {
1561         .name              = "acl",
1562         .search            = acl_search,
1563         .add               = acl_add,
1564         .modify            = acl_modify,
1565         .del               = acl_delete,
1566         .rename            = acl_rename,
1567         .extended          = acl_extended,
1568         .init_context      = acl_module_init
1569 };
1570
1571 int ldb_acl_module_init(const char *version)
1572 {
1573         LDB_MODULE_CHECK_VERSION(version);
1574         return ldb_register_module(&ldb_acl_module_ops);
1575 }