source4/dsdb/samdb/ldb_modules/acl.c

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