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