source4/dsdb/samdb/ldb_modules/acl.c

   1 /*
   2   ldb database library
   3
   4   Copyright (C) Simo Sorce 2006-2008
   5   Copyright (C) Nadezhda Ivanova 2009
   6   Copyright (C) Anatoliy Atanasov  2009
   7
   8   This program is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 3 of the License, or
  11   (at your option) any later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 /*
  23  *  Name: ldb
  24  *
  25  *  Component: ldb ACL module
  26  *
  27  *  Description: Module that performs authorisation access checks based on the
  28  *               account's security context and the DACL of the object being polled.
  29  *               Only DACL checks implemented at this point
  30  *
  31  *  Authors: Nadezhda Ivanova, Anatoliy Atanasov
  32  */
  33
  34 #include "includes.h"
  35 #include "ldb_module.h"
  36 #include "auth/auth.h"
  37 #include "libcli/security/security.h"
  38 #include "dsdb/samdb/samdb.h"
  39 #include "librpc/gen_ndr/ndr_security.h"
  40 #include "param/param.h"
  41 #include "dsdb/samdb/ldb_modules/util.h"
  42 #include "dsdb/samdb/ldb_modules/schema.h"
  43 #include "lib/util/tsort.h"
  44 #include "system/kerberos.h"
  45 #include "auth/kerberos/kerberos.h"
  46
  47 struct extended_access_check_attribute {
  48         const char *oa_name;
  49         const uint32_t requires_rights;
  50 };
  51
  52 struct acl_private {
  53         bool acl_perform;
  54         const char **password_attrs;
  55 };
  56
  57 struct acl_context {
  58         struct ldb_module *module;
  59         struct ldb_request *req;
  60         bool am_system;
  61         bool allowedAttributes;
  62         bool allowedAttributesEffective;
  63         bool allowedChildClasses;
  64         bool allowedChildClassesEffective;
  65         bool sDRightsEffective;
  66         bool userPassword;
  67         const char * const *attrs;
  68         struct dsdb_schema *schema;
  69 };
  70
  71 static int acl_module_init(struct ldb_module *module)
  72 {
  73         struct ldb_context *ldb;
  74         struct acl_private *data;
  75         int ret;
  76         unsigned int i;
  77         TALLOC_CTX *mem_ctx;
  78         static const char *attrs[] = { "passwordAttribute", NULL };
  79         struct ldb_result *res;
  80         struct ldb_message *msg;
  81         struct ldb_message_element *password_attributes;
  82
  83         ldb = ldb_module_get_ctx(module);
  84
  85         ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
  86         if (ret != LDB_SUCCESS) {
  87                 ldb_debug(ldb, LDB_DEBUG_ERROR,
  88                           "acl_module_init: Unable to register control with rootdse!\n");
  89                 return ldb_operr(ldb);
  90         }
  91
  92         data = talloc(module, struct acl_private);
  93         if (data == NULL) {
  94                 return ldb_oom(ldb);
  95         }
  96
  97         data->password_attrs = NULL;
  98         data->acl_perform = lpcfg_parm_bool(ldb_get_opaque(ldb, "loadparm"),
  99                                          NULL, "acl", "perform", false);
 100         ldb_module_set_private(module, data);
 101
 102         mem_ctx = talloc_new(module);
 103         if (!mem_ctx) {
 104                 return ldb_oom(ldb);
 105         }
 106
 107         ret = dsdb_module_search_dn(module, mem_ctx, &res,
 108                                     ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
 109                                     attrs,
 110                                     DSDB_FLAG_NEXT_MODULE, NULL);
 111         if (ret != LDB_SUCCESS) {
 112                 goto done;
 113         }
 114         if (res->count == 0) {
 115                 goto done;
 116         }
 117
 118         if (res->count > 1) {
 119                 talloc_free(mem_ctx);
 120                 return LDB_ERR_CONSTRAINT_VIOLATION;
 121         }
 122
 123         msg = res->msgs[0];
 124
 125         password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
 126         if (!password_attributes) {
 127                 goto done;
 128         }
 129         data->password_attrs = talloc_array(data, const char *, password_attributes->num_values + 1);
 130         if (!data->password_attrs) {
 131                 talloc_free(mem_ctx);
 132                 return ldb_oom(ldb);
 133         }
 134         for (i=0; i < password_attributes->num_values; i++) {
 135                 data->password_attrs[i] = (const char *)password_attributes->values[i].data;
 136                 talloc_steal(data->password_attrs, password_attributes->values[i].data);
 137         }
 138         data->password_attrs[i] = NULL;
 139
 140 done:
 141         talloc_free(mem_ctx);
 142         return ldb_next_init(module);
 143 }
 144
 145 static int acl_allowedAttributes(struct ldb_module *module,
 146                                  const struct dsdb_schema *schema,
 147                                  struct ldb_message *sd_msg,
 148                                  struct ldb_message *msg,
 149                                  struct acl_context *ac)
 150 {
 151         struct ldb_message_element *oc_el;
 152         struct ldb_context *ldb = ldb_module_get_ctx(module);
 153         TALLOC_CTX *mem_ctx;
 154         const char **attr_list;
 155         int i, ret;
 156
 157         /* If we don't have a schema yet, we can't do anything... */
 158         if (schema == NULL) {
 159                 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 160                 return LDB_ERR_OPERATIONS_ERROR;
 161         }
 162
 163         /* Must remove any existing attribute */
 164         if (ac->allowedAttributes) {
 165                 ldb_msg_remove_attr(msg, "allowedAttributes");
 166         }
 167
 168         mem_ctx = talloc_new(msg);
 169         if (!mem_ctx) {
 170                 return ldb_oom(ldb);
 171         }
 172
 173         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 174         attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
 175         if (!attr_list) {
 176                 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
 177                 talloc_free(mem_ctx);
 178                 return LDB_ERR_OPERATIONS_ERROR;
 179         }
 180         if (ac->allowedAttributes) {
 181                 for (i=0; attr_list && attr_list[i]; i++) {
 182                         ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
 183                 }
 184         }
 185         if (ac->allowedAttributesEffective) {
 186                 struct security_descriptor *sd;
 187                 struct dom_sid *sid = NULL;
 188                 struct ldb_control *as_system = ldb_request_get_control(ac->req,
 189                                                                         LDB_CONTROL_AS_SYSTEM_OID);
 190
 191                 if (as_system != NULL) {
 192                         as_system->critical = 0;
 193                 }
 194
 195                 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
 196                 if (ac->am_system || as_system) {
 197                         for (i=0; attr_list && attr_list[i]; i++) {
 198                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 199                         }
 200                         return LDB_SUCCESS;
 201                 }
 202
 203                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), mem_ctx, sd_msg, &sd);
 204
 205                 if (ret != LDB_SUCCESS) {
 206                         return ret;
 207                 }
 208
 209                 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
 210                 for (i=0; attr_list && attr_list[i]; i++) {
 211                         const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
 212                                                                                         attr_list[i]);
 213                         if (!attr) {
 214                                 return ldb_operr(ldb);
 215                         }
 216                         /* remove constructed attributes */
 217                         if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
 218                             || attr->systemOnly
 219                             || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
 220                                 continue;
 221                         }
 222                         ret = acl_check_access_on_attribute(module,
 223                                                             msg,
 224                                                             sd,
 225                                                             sid,
 226                                                             SEC_ADS_WRITE_PROP,
 227                                                             attr);
 228                         if (ret == LDB_SUCCESS) {
 229                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 230                         }
 231                 }
 232         }
 233         return LDB_SUCCESS;
 234 }
 235
 236 static int acl_childClasses(struct ldb_module *module,
 237                             const struct dsdb_schema *schema,
 238                             struct ldb_message *sd_msg,
 239                             struct ldb_message *msg,
 240                             const char *attrName)
 241 {
 242         struct ldb_message_element *oc_el;
 243         struct ldb_message_element *allowedClasses;
 244         const struct dsdb_class *sclass;
 245         unsigned int i, j;
 246         int ret;
 247
 248         /* If we don't have a schema yet, we can't do anything... */
 249         if (schema == NULL) {
 250                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 251                 return LDB_ERR_OPERATIONS_ERROR;
 252         }
 253
 254         /* Must remove any existing attribute, or else confusion reins */
 255         ldb_msg_remove_attr(msg, attrName);
 256         ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
 257         if (ret != LDB_SUCCESS) {
 258                 return ret;
 259         }
 260
 261         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 262
 263         for (i=0; oc_el && i < oc_el->num_values; i++) {
 264                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 265                 if (!sclass) {
 266                         /* We don't know this class?  what is going on? */
 267                         continue;
 268                 }
 269
 270                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 271                         ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
 272                 }
 273         }
 274         if (allowedClasses->num_values > 1) {
 275                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 276                 for (i=1 ; i < allowedClasses->num_values; i++) {
 277                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 278                         struct ldb_val *val2 = &allowedClasses->values[i];
 279                         if (data_blob_cmp(val1, val2) == 0) {
 280                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
 281                                 allowedClasses->num_values--;
 282                                 i--;
 283                         }
 284                 }
 285         }
 286
 287         return LDB_SUCCESS;
 288 }
 289
 290 static int acl_childClassesEffective(struct ldb_module *module,
 291                                      const struct dsdb_schema *schema,
 292                                      struct ldb_message *sd_msg,
 293                                      struct ldb_message *msg,
 294                                      struct acl_context *ac)
 295 {
 296         struct ldb_message_element *oc_el;
 297         struct ldb_message_element *allowedClasses = NULL;
 298         const struct dsdb_class *sclass;
 299         struct security_descriptor *sd;
 300         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 301                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 302         struct dom_sid *sid = NULL;
 303         unsigned int i, j;
 304         int ret;
 305
 306         if (as_system != NULL) {
 307                 as_system->critical = 0;
 308         }
 309
 310         if (ac->am_system || as_system) {
 311                 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
 312         }
 313
 314         /* If we don't have a schema yet, we can't do anything... */
 315         if (schema == NULL) {
 316                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 317                 return LDB_ERR_OPERATIONS_ERROR;
 318         }
 319
 320         /* Must remove any existing attribute, or else confusion reins */
 321         ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
 322
 323         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 324         ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 325         if (ret != LDB_SUCCESS) {
 326                 return ret;
 327         }
 328
 329         sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 330         for (i=0; oc_el && i < oc_el->num_values; i++) {
 331                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 332                 if (!sclass) {
 333                         /* We don't know this class?  what is going on? */
 334                         continue;
 335                 }
 336
 337                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 338                         ret = acl_check_access_on_class(module,
 339                                                         schema,
 340                                                         msg,
 341                                                         sd,
 342                                                         sid,
 343                                                         SEC_ADS_CREATE_CHILD,
 344                                                         sclass->possibleInferiors[j]);
 345                         if (ret == LDB_SUCCESS) {
 346                                 ldb_msg_add_string(msg, "allowedChildClassesEffective",
 347                                                    sclass->possibleInferiors[j]);
 348                         }
 349                 }
 350         }
 351         allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
 352         if (!allowedClasses) {
 353                 return LDB_SUCCESS;
 354         }
 355
 356         if (allowedClasses->num_values > 1) {
 357                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 358                 for (i=1 ; i < allowedClasses->num_values; i++) {
 359                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 360                         struct ldb_val *val2 = &allowedClasses->values[i];
 361                         if (data_blob_cmp(val1, val2) == 0) {
 362                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
 363                                 allowedClasses->num_values--;
 364                                 i--;
 365                         }
 366                 }
 367         }
 368         return LDB_SUCCESS;
 369 }
 370
 371 static int acl_sDRightsEffective(struct ldb_module *module,
 372                                  struct ldb_message *sd_msg,
 373                                  struct ldb_message *msg,
 374                                  struct acl_context *ac)
 375 {
 376         struct ldb_message_element *rightsEffective;
 377         int ret;
 378         struct security_descriptor *sd;
 379         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 380                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 381         struct dom_sid *sid = NULL;
 382         uint32_t flags = 0;
 383
 384         if (as_system != NULL) {
 385                 as_system->critical = 0;
 386         }
 387
 388         /* Must remove any existing attribute, or else confusion reins */
 389         ldb_msg_remove_attr(msg, "sDRightsEffective");
 390         ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
 391         if (ret != LDB_SUCCESS) {
 392                 return ret;
 393         }
 394         if (ac->am_system || as_system) {
 395                 flags = SECINFO_OWNER | SECINFO_GROUP |  SECINFO_SACL |  SECINFO_DACL;
 396         }
 397         else {
 398                 /* Get the security descriptor from the message */
 399                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 400                 if (ret != LDB_SUCCESS) {
 401                         return ret;
 402                 }
 403                 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 404                 ret = acl_check_access_on_attribute(module,
 405                                                     msg,
 406                                                     sd,
 407                                                     sid,
 408                                                     SEC_STD_WRITE_OWNER,
 409                                                     NULL);
 410                 if (ret == LDB_SUCCESS) {
 411                         flags |= SECINFO_OWNER | SECINFO_GROUP;
 412                 }
 413                 ret = acl_check_access_on_attribute(module,
 414                                                     msg,
 415                                                     sd,
 416                                                     sid,
 417                                                     SEC_STD_WRITE_DAC,
 418                                                     NULL);
 419                 if (ret == LDB_SUCCESS) {
 420                         flags |= SECINFO_DACL;
 421                 }
 422                 ret = acl_check_access_on_attribute(module,
 423                                                     msg,
 424                                                     sd,
 425                                                     sid,
 426                                                     SEC_FLAG_SYSTEM_SECURITY,
 427                                                     NULL);
 428                 if (ret == LDB_SUCCESS) {
 429                         flags |= SECINFO_SACL;
 430                 }
 431         }
 432         return samdb_msg_add_uint(ldb_module_get_ctx(module), msg, msg,
 433                                   "sDRightsEffective", flags);
 434 }
 435
 436 static int acl_validate_spn_value(TALLOC_CTX *mem_ctx,
 437                                   struct ldb_context *ldb,
 438                                   const char *spn_value,
 439                                   uint32_t userAccountControl,
 440                                   const char *samAccountName,
 441                                   const char *dnsHostName,
 442                                   const char *netbios_name,
 443                                   const char *ntds_guid)
 444 {
 445         int ret;
 446         krb5_context krb_ctx;
 447         krb5_error_code kerr;
 448         krb5_principal principal;
 449         char *instanceName;
 450         char *serviceType;
 451         char *serviceName;
 452         const char *realm;
 453         const char *forest_name = samdb_forest_name(ldb, mem_ctx);
 454         const char *base_domain = samdb_default_domain_name(ldb, mem_ctx);
 455         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
 456                                                           struct loadparm_context);
 457         bool is_dc = (userAccountControl & UF_SERVER_TRUST_ACCOUNT) ||
 458                 (userAccountControl & UF_PARTIAL_SECRETS_ACCOUNT);
 459
 460         if (strcasecmp_m(spn_value, samAccountName) == 0) {
 461                 /* MacOS X sets this value, and setting an SPN of your
 462                  * own samAccountName is both pointless and safe */
 463                 return LDB_SUCCESS;
 464         }
 465
 466         kerr = smb_krb5_init_context_basic(mem_ctx,
 467                                            lp_ctx,
 468                                            &krb_ctx);
 469         if (kerr != 0) {
 470                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 471                                  "Could not initialize kerberos context.");
 472         }
 473
 474         ret = krb5_parse_name(krb_ctx, spn_value, &principal);
 475         if (ret) {
 476                 krb5_free_context(krb_ctx);
 477                 return LDB_ERR_CONSTRAINT_VIOLATION;
 478         }
 479
 480         if (principal->name.name_string.len < 2) {
 481                 goto fail;
 482         }
 483
 484         instanceName = principal->name.name_string.val[1];
 485         serviceType = principal->name.name_string.val[0];
 486         realm = krb5_principal_get_realm(krb_ctx, principal);
 487         if (principal->name.name_string.len == 3) {
 488                 serviceName = principal->name.name_string.val[2];
 489         } else {
 490                 serviceName = NULL;
 491         }
 492
 493         if (serviceName) {
 494                 if (!is_dc) {
 495                         goto fail;
 496                 }
 497                 if (strcasecmp(serviceType, "ldap") == 0) {
 498                         if (strcasecmp(serviceName, netbios_name) != 0 &&
 499                             strcasecmp(serviceName, forest_name) != 0) {
 500                                 goto fail;
 501                         }
 502
 503                 } else if (strcasecmp(serviceType, "gc") == 0) {
 504                         if (strcasecmp(serviceName, forest_name) != 0) {
 505                                 goto fail;
 506                         }
 507                 } else {
 508                         if (strcasecmp(serviceName, base_domain) != 0 &&
 509                             strcasecmp(serviceName, netbios_name) != 0) {
 510                                 goto fail;
 511                         }
 512                 }
 513         }
 514         /* instanceName can be samAccountName without $ or dnsHostName
 515          * or "ntds_guid._msdcs.forest_domain for DC objects */
 516         if (strlen(instanceName) == (strlen(samAccountName) - 1)
 517             && strncasecmp(instanceName, samAccountName, strlen(samAccountName) - 1) == 0) {
 518                 goto success;
 519         } else if (dnsHostName != NULL && strcasecmp(instanceName, dnsHostName) == 0) {
 520                 goto success;
 521         } else if (is_dc) {
 522                 const char *guid_str;
 523                 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
 524                                            ntds_guid,
 525                                            forest_name);
 526                 if (strcasecmp(instanceName, guid_str) == 0) {
 527                         goto success;
 528                 }
 529         }
 530
 531 fail:
 532         krb5_free_principal(krb_ctx, principal);
 533         krb5_free_context(krb_ctx);
 534         return LDB_ERR_CONSTRAINT_VIOLATION;
 535
 536 success:
 537         krb5_free_principal(krb_ctx, principal);
 538         krb5_free_context(krb_ctx);
 539         return LDB_SUCCESS;
 540 }
 541
 542 static int acl_check_spn(TALLOC_CTX *mem_ctx,
 543                          struct ldb_module *module,
 544                          struct ldb_request *req,
 545                          struct security_descriptor *sd,
 546                          struct dom_sid *sid,
 547                          const struct GUID *oc_guid,
 548                          const struct dsdb_attribute *attr)
 549 {
 550         int ret;
 551         unsigned int i;
 552         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 553         struct ldb_context *ldb = ldb_module_get_ctx(module);
 554         struct ldb_result *acl_res;
 555         struct ldb_result *netbios_res;
 556         struct ldb_message_element *el;
 557         struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
 558         uint32_t userAccountControl;
 559         const char *samAccountName;
 560         const char *dnsHostName;
 561         const char *netbios_name;
 562         struct GUID ntds;
 563         char *ntds_guid = NULL;
 564
 565         static const char *acl_attrs[] = {
 566                 "samAccountName",
 567                 "dnsHostName",
 568                 "userAccountControl",
 569                 NULL
 570         };
 571         static const char *netbios_attrs[] = {
 572                 "nETBIOSName",
 573                 NULL
 574         };
 575
 576         /* if we have wp, we can do whatever we like */
 577         if (acl_check_access_on_attribute(module,
 578                                           tmp_ctx,
 579                                           sd,
 580                                           sid,
 581                                           SEC_ADS_WRITE_PROP,
 582                                           attr) == LDB_SUCCESS) {
 583                 talloc_free(tmp_ctx);
 584                 return LDB_SUCCESS;
 585         }
 586
 587         ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 588                                        GUID_DRS_VALIDATE_SPN,
 589                                        SEC_ADS_SELF_WRITE,
 590                                        sid);
 591
 592         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 593                 dsdb_acl_debug(sd, acl_user_token(module),
 594                                req->op.mod.message->dn,
 595                                true,
 596                                10);
 597                 talloc_free(tmp_ctx);
 598                 return ret;
 599         }
 600
 601         ret = dsdb_module_search_dn(module, tmp_ctx,
 602                                     &acl_res, req->op.mod.message->dn,
 603                                     acl_attrs,
 604                                     DSDB_FLAG_NEXT_MODULE |
 605                                     DSDB_SEARCH_SHOW_DELETED, req);
 606         if (ret != LDB_SUCCESS) {
 607                 talloc_free(tmp_ctx);
 608                 return ret;
 609         }
 610
 611         userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
 612         dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
 613         samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
 614
 615         ret = dsdb_module_search(module, tmp_ctx,
 616                                  &netbios_res, partitions_dn,
 617                                  LDB_SCOPE_ONELEVEL,
 618                                  netbios_attrs,
 619                                  DSDB_FLAG_NEXT_MODULE,
 620                                  req,
 621                                  "(ncName=%s)",
 622                                  ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
 623
 624         netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
 625
 626         el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
 627         if (!el) {
 628                 talloc_free(tmp_ctx);
 629                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 630                                          "Error finding element for servicePrincipalName.");
 631         }
 632
 633         /* NTDSDSA objectGuid of object we are checking SPN for */
 634         if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
 635                 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
 636                                                              req->op.mod.message->dn, &ntds, req);
 637                 if (ret != LDB_SUCCESS) {
 638                         ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
 639                                                ldb_dn_get_linearized(req->op.mod.message->dn),
 640                                                ldb_strerror(ret));
 641                         talloc_free(tmp_ctx);
 642                         return LDB_ERR_OPERATIONS_ERROR;
 643                 }
 644                 ntds_guid = GUID_string(tmp_ctx, &ntds);
 645         }
 646
 647         for (i=0; i < el->num_values; i++) {
 648                 ret = acl_validate_spn_value(tmp_ctx,
 649                                              ldb,
 650                                              (char *)el->values[i].data,
 651                                              userAccountControl,
 652                                              samAccountName,
 653                                              dnsHostName,
 654                                              netbios_name,
 655                                              ntds_guid);
 656                 if (ret != LDB_SUCCESS) {
 657                         talloc_free(tmp_ctx);
 658                         return ret;
 659                 }
 660         }
 661         talloc_free(tmp_ctx);
 662         return LDB_SUCCESS;
 663 }
 664
 665 static int acl_add(struct ldb_module *module, struct ldb_request *req)
 666 {
 667         int ret;
 668         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
 669         struct ldb_context *ldb;
 670         const struct dsdb_schema *schema;
 671         struct ldb_message_element *oc_el;
 672         const struct GUID *guid;
 673         struct ldb_dn *nc_root;
 674         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 675
 676         if (as_system != NULL) {
 677                 as_system->critical = 0;
 678         }
 679
 680         if (dsdb_module_am_system(module) || as_system) {
 681                 return ldb_next_request(module, req);
 682         }
 683         if (ldb_dn_is_special(req->op.add.message->dn)) {
 684                 return ldb_next_request(module, req);
 685         }
 686
 687         ldb = ldb_module_get_ctx(module);
 688
 689         /* Creating an NC. There is probably something we should do here,
 690          * but we will establish that later */
 691
 692         ret = dsdb_find_nc_root(ldb, req, req->op.add.message->dn, &nc_root);
 693         if (ret != LDB_SUCCESS) {
 694                 return ret;
 695         }
 696         if (ldb_dn_compare(nc_root, req->op.add.message->dn) == 0) {
 697                 talloc_free(nc_root);
 698                 return ldb_next_request(module, req);
 699         }
 700         talloc_free(nc_root);
 701
 702         schema = dsdb_get_schema(ldb, req);
 703         if (!schema) {
 704                 return ldb_operr(ldb);
 705         }
 706
 707         oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
 708         if (!oc_el || oc_el->num_values == 0) {
 709                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
 710                                        "acl: unable to find objectClass on %s\n",
 711                                        ldb_dn_get_linearized(req->op.add.message->dn));
 712                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 713         }
 714
 715         guid = class_schemaid_guid_by_lDAPDisplayName(schema,
 716                                                       (char *)oc_el->values[oc_el->num_values-1].data);
 717         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid, req);
 718         if (ret != LDB_SUCCESS) {
 719                 return ret;
 720         }
 721         return ldb_next_request(module, req);
 722 }
 723
 724 /* ckecks if modifications are allowed on "Member" attribute */
 725 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
 726                                      struct ldb_module *module,
 727                                      struct ldb_request *req,
 728                                      struct security_descriptor *sd,
 729                                      struct dom_sid *sid,
 730                                      const struct GUID *oc_guid,
 731                                      const struct dsdb_attribute *attr)
 732 {
 733         int ret;
 734         unsigned int i;
 735         struct ldb_context *ldb = ldb_module_get_ctx(module);
 736         struct ldb_dn *user_dn;
 737         struct ldb_message_element *member_el;
 738         /* if we have wp, we can do whatever we like */
 739         if (acl_check_access_on_attribute(module,
 740                                           mem_ctx,
 741                                           sd,
 742                                           sid,
 743                                           SEC_ADS_WRITE_PROP,
 744                                           attr) == LDB_SUCCESS) {
 745                 return LDB_SUCCESS;
 746         }
 747         /* if we are adding/deleting ourselves, check for self membership */
 748         ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
 749                                   &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
 750                                   &user_dn);
 751         if (ret != LDB_SUCCESS) {
 752                 return ret;
 753         }
 754         member_el = ldb_msg_find_element(req->op.mod.message, "member");
 755         if (!member_el) {
 756                 return ldb_operr(ldb);
 757         }
 758         /* user can only remove oneself */
 759         if (member_el->num_values == 0) {
 760                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 761         }
 762         for (i = 0; i < member_el->num_values; i++) {
 763                 if (strcasecmp((const char *)member_el->values[i].data,
 764                                ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
 765                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 766                 }
 767         }
 768         ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
 769                                        GUID_DRS_SELF_MEMBERSHIP,
 770                                        SEC_ADS_SELF_WRITE,
 771                                        sid);
 772         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 773                 dsdb_acl_debug(sd, acl_user_token(module),
 774                                req->op.mod.message->dn,
 775                                true,
 776                                10);
 777         }
 778         return ret;
 779 }
 780
 781 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
 782                                      struct ldb_module *module,
 783                                      struct ldb_request *req,
 784                                      struct security_descriptor *sd,
 785                                      struct dom_sid *sid,
 786                                      const struct GUID *oc_guid,
 787                                      bool userPassword)
 788 {
 789         int ret = LDB_SUCCESS;
 790         unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
 791         struct ldb_message_element *el;
 792         struct ldb_message *msg;
 793         const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
 794                                         "unicodePwd", "dBCSPwd", NULL }, **l;
 795         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 796
 797         msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
 798         if (msg == NULL) {
 799                 return ldb_module_oom(module);
 800         }
 801         for (l = passwordAttrs; *l != NULL; l++) {
 802                 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
 803                         continue;
 804                 }
 805
 806                 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
 807                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
 808                                 ++del_attr_cnt;
 809                         }
 810                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
 811                                 ++add_attr_cnt;
 812                         }
 813                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
 814                                 ++rep_attr_cnt;
 815                         }
 816                         ldb_msg_remove_element(msg, el);
 817                 }
 818         }
 819
 820         /* single deletes will be handled by the "password_hash" LDB module
 821          * later in the stack, so we let it though here */
 822         if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
 823                 talloc_free(tmp_ctx);
 824                 return LDB_SUCCESS;
 825         }
 826
 827         if (ldb_request_get_control(req,
 828                                     DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
 829                 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
 830                  * have a user password change and not a set as the message
 831                  * looks like. In it's value blob it contains the NT and/or LM
 832                  * hash of the old password specified by the user.
 833                  * This control is used by the SAMR and "kpasswd" password
 834                  * change mechanisms. */
 835                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 836                                                GUID_DRS_USER_CHANGE_PASSWORD,
 837                                                SEC_ADS_CONTROL_ACCESS,
 838                                                sid);
 839         }
 840         else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
 841                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 842                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
 843                                                SEC_ADS_CONTROL_ACCESS,
 844                                                sid);
 845         }
 846         else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
 847                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 848                                                GUID_DRS_USER_CHANGE_PASSWORD,
 849                                                SEC_ADS_CONTROL_ACCESS,
 850                                                sid);
 851                 /* Very strange, but we get constraint violation in this case */
 852                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 853                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
 854                 }
 855         }
 856         if (ret != LDB_SUCCESS) {
 857                 dsdb_acl_debug(sd, acl_user_token(module),
 858                                req->op.mod.message->dn,
 859                                true,
 860                                10);
 861         }
 862         talloc_free(tmp_ctx);
 863         return ret;
 864 }
 865
 866 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
 867 {
 868         int ret;
 869         struct ldb_context *ldb = ldb_module_get_ctx(module);
 870         const struct dsdb_schema *schema;
 871         unsigned int i;
 872         const struct GUID *guid;
 873         uint32_t access_granted;
 874         struct object_tree *root = NULL;
 875         struct object_tree *new_node = NULL;
 876         NTSTATUS status;
 877         struct ldb_result *acl_res;
 878         struct security_descriptor *sd;
 879         struct dom_sid *sid = NULL;
 880         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 881         bool userPassword = dsdb_user_password_support(module, req, req);
 882         TALLOC_CTX *tmp_ctx = talloc_new(req);
 883         static const char *acl_attrs[] = {
 884                 "nTSecurityDescriptor",
 885                 "objectClass",
 886                 "objectSid",
 887                 NULL
 888         };
 889
 890         if (as_system != NULL) {
 891                 as_system->critical = 0;
 892         }
 893
 894         /* Don't print this debug statement if elements[0].name is going to be NULL */
 895         if(req->op.mod.message->num_elements > 0)
 896         {
 897                 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
 898         }
 899         if (dsdb_module_am_system(module) || as_system) {
 900                 return ldb_next_request(module, req);
 901         }
 902         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 903                 return ldb_next_request(module, req);
 904         }
 905         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
 906                                     acl_attrs,
 907                                     DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED,
 908                                     req);
 909
 910         if (ret != LDB_SUCCESS) {
 911                 goto fail;
 912         }
 913
 914         schema = dsdb_get_schema(ldb, tmp_ctx);
 915         if (!schema) {
 916                 ret = LDB_ERR_OPERATIONS_ERROR;
 917                 goto fail;
 918         }
 919
 920         ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
 921         if (ret != LDB_SUCCESS) {
 922                 talloc_free(tmp_ctx);
 923                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 924                                  "acl_modify: Error retrieving security descriptor.");
 925         }
 926         /* Theoretically we pass the check if the object has no sd */
 927         if (!sd) {
 928                 goto success;
 929         }
 930
 931         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
 932         if (!guid) {
 933                 talloc_free(tmp_ctx);
 934                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 935                                  "acl_modify: Error retrieving object class GUID.");
 936         }
 937         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
 938         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 939                                    &root, &new_node)) {
 940                 talloc_free(tmp_ctx);
 941                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 942                                  "acl_modify: Error adding new node in object tree.");
 943         }
 944         for (i=0; i < req->op.mod.message->num_elements; i++){
 945                 const struct dsdb_attribute *attr;
 946                 attr = dsdb_attribute_by_lDAPDisplayName(schema,
 947                                                          req->op.mod.message->elements[i].name);
 948
 949                 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
 950                         status = sec_access_check_ds(sd, acl_user_token(module),
 951                                              SEC_STD_WRITE_DAC,
 952                                              &access_granted,
 953                                              NULL,
 954                                              sid);
 955
 956                         if (!NT_STATUS_IS_OK(status)) {
 957                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
 958                                                        "Object %s has no write dacl access\n",
 959                                                        ldb_dn_get_linearized(req->op.mod.message->dn));
 960                                 dsdb_acl_debug(sd,
 961                                                acl_user_token(module),
 962                                                req->op.mod.message->dn,
 963                                                true,
 964                                                10);
 965                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 966                                 goto fail;
 967                         }
 968                 }
 969                 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
 970                         ret = acl_check_self_membership(tmp_ctx,
 971                                                         module,
 972                                                         req,
 973                                                         sd,
 974                                                         sid,
 975                                                         guid,
 976                                                         attr);
 977                         if (ret != LDB_SUCCESS) {
 978                                 goto fail;
 979                         }
 980                 }
 981                 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
 982                         /* this one is not affected by any rights, we should let it through
 983                            so that passwords_hash returns the correct error */
 984                         continue;
 985                 }
 986                 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
 987                          (userPassword && ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0) ||
 988                          ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
 989                         ret = acl_check_password_rights(tmp_ctx,
 990                                                         module,
 991                                                         req,
 992                                                         sd,
 993                                                         sid,
 994                                                         guid,
 995                                                         userPassword);
 996                         if (ret != LDB_SUCCESS) {
 997                                 goto fail;
 998                         }
 999                 } else if (ldb_attr_cmp("servicePrincipalName", req->op.mod.message->elements[i].name) == 0) {
1000                         ret = acl_check_spn(tmp_ctx,
1001                                             module,
1002                                             req,
1003                                             sd,
1004                                             sid,
1005                                             guid,
1006                                             attr);
1007                         if (ret != LDB_SUCCESS) {
1008                                 goto fail;
1009                         }
1010                 } else {
1011
1012                 /* This basic attribute existence check with the right errorcode
1013                  * is needed since this module is the first one which requests
1014                  * schema attribute information.
1015                  * The complete attribute checking is done in the
1016                  * "objectclass_attrs" module behind this one.
1017                  */
1018                         if (!attr) {
1019                                 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
1020                                                        req->op.mod.message->elements[i].name,
1021                                                ldb_dn_get_linearized(req->op.mod.message->dn));
1022                                 ret =  LDB_ERR_NO_SUCH_ATTRIBUTE;
1023                                 goto fail;
1024                         }
1025                         if (!insert_in_object_tree(tmp_ctx,
1026                                                    &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
1027                                                    &new_node, &new_node)) {
1028                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1029                                                        "acl_modify: cannot add to object tree securityGUID\n");
1030                                 ret = LDB_ERR_OPERATIONS_ERROR;
1031                                 goto fail;
1032                         }
1033
1034                         if (!insert_in_object_tree(tmp_ctx,
1035                                                    &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
1036                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1037                                                        "acl_modify: cannot add to object tree attributeGUID\n");
1038                                 ret = LDB_ERR_OPERATIONS_ERROR;
1039                                 goto fail;
1040                         }
1041                 }
1042         }
1043
1044         if (root->num_of_children > 0) {
1045                 status = sec_access_check_ds(sd, acl_user_token(module),
1046                                              SEC_ADS_WRITE_PROP,
1047                                              &access_granted,
1048                                              root,
1049                                              sid);
1050
1051                 if (!NT_STATUS_IS_OK(status)) {
1052                         ldb_asprintf_errstring(ldb_module_get_ctx(module),
1053                                                "Object %s has no write property access\n",
1054                                                ldb_dn_get_linearized(req->op.mod.message->dn));
1055                         dsdb_acl_debug(sd,
1056                                        acl_user_token(module),
1057                                        req->op.mod.message->dn,
1058                                        true,
1059                                        10);
1060                         ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1061                         goto fail;
1062                 }
1063         }
1064
1065 success:
1066         talloc_free(tmp_ctx);
1067         return ldb_next_request(module, req);
1068 fail:
1069         talloc_free(tmp_ctx);
1070         return ret;
1071 }
1072
1073 /* similar to the modify for the time being.
1074  * We need to consider the special delete tree case, though - TODO */
1075 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1076 {
1077         int ret;
1078         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
1079         struct ldb_context *ldb;
1080         struct ldb_dn *nc_root;
1081         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1082
1083         if (as_system != NULL) {
1084                 as_system->critical = 0;
1085         }
1086
1087         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1088         if (dsdb_module_am_system(module) || as_system) {
1089                 return ldb_next_request(module, req);
1090         }
1091         if (ldb_dn_is_special(req->op.del.dn)) {
1092                 return ldb_next_request(module, req);
1093         }
1094
1095         ldb = ldb_module_get_ctx(module);
1096
1097         /* Make sure we aren't deleting a NC */
1098
1099         ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1100         if (ret != LDB_SUCCESS) {
1101                 return ret;
1102         }
1103         if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1104                 talloc_free(nc_root);
1105                 DEBUG(10,("acl:deleting a NC\n"));
1106                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1107                 return ldb_module_done(req, NULL, NULL,
1108                                        LDB_ERR_UNWILLING_TO_PERFORM);
1109         }
1110         talloc_free(nc_root);
1111
1112         /* First check if we have delete object right */
1113         ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn,
1114                                              SEC_STD_DELETE, NULL, req);
1115         if (ret == LDB_SUCCESS) {
1116                 return ldb_next_request(module, req);
1117         }
1118
1119         /* Nope, we don't have delete object. Lets check if we have delete
1120          * child on the parent */
1121         ret = dsdb_module_check_access_on_dn(module, req, parent,
1122                                              SEC_ADS_DELETE_CHILD, NULL, req);
1123         if (ret != LDB_SUCCESS) {
1124                 return ret;
1125         }
1126
1127         return ldb_next_request(module, req);
1128 }
1129
1130 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1131 {
1132         int ret;
1133         struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
1134         struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
1135         const struct dsdb_schema *schema;
1136         struct ldb_context *ldb;
1137         struct security_descriptor *sd = NULL;
1138         struct dom_sid *sid = NULL;
1139         struct ldb_result *acl_res;
1140         const struct GUID *guid;
1141         struct ldb_dn *nc_root;
1142         struct object_tree *root = NULL;
1143         struct object_tree *new_node = NULL;
1144         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1145         TALLOC_CTX *tmp_ctx = talloc_new(req);
1146         NTSTATUS status;
1147         uint32_t access_granted;
1148         const char *rdn_name;
1149         static const char *acl_attrs[] = {
1150                 "nTSecurityDescriptor",
1151                 "objectClass",
1152                 "objectSid",
1153                 NULL
1154         };
1155
1156         if (as_system != NULL) {
1157                 as_system->critical = 0;
1158         }
1159
1160         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1161         if (dsdb_module_am_system(module) || as_system) {
1162                 return ldb_next_request(module, req);
1163         }
1164         if (ldb_dn_is_special(req->op.rename.olddn)) {
1165                 return ldb_next_request(module, req);
1166         }
1167
1168         ldb = ldb_module_get_ctx(module);
1169
1170         /* Make sure we aren't renaming/moving a NC */
1171
1172         ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1173         if (ret != LDB_SUCCESS) {
1174                 return ret;
1175         }
1176         if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1177                 talloc_free(nc_root);
1178                 DEBUG(10,("acl:renaming/moving a NC\n"));
1179                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1180                 return ldb_module_done(req, NULL, NULL,
1181                                        LDB_ERR_UNWILLING_TO_PERFORM);
1182         }
1183         talloc_free(nc_root);
1184
1185         /* Look for the parent */
1186
1187         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1188                                     req->op.rename.olddn, acl_attrs,
1189                                     DSDB_FLAG_NEXT_MODULE |
1190                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1191         /* we sould be able to find the parent */
1192         if (ret != LDB_SUCCESS) {
1193                 DEBUG(10,("acl: failed to find object %s\n",
1194                           ldb_dn_get_linearized(req->op.rename.olddn)));
1195                 talloc_free(tmp_ctx);
1196                 return ret;
1197         }
1198
1199         schema = dsdb_get_schema(ldb, acl_res);
1200         if (!schema) {
1201                 talloc_free(tmp_ctx);
1202                 return ldb_operr(ldb);
1203         }
1204
1205         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1206         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1207                                    &root, &new_node)) {
1208                 talloc_free(tmp_ctx);
1209                 return ldb_operr(ldb);
1210         };
1211
1212         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1213                                                           "name");
1214         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1215                                    &new_node, &new_node)) {
1216                 talloc_free(tmp_ctx);
1217                 return ldb_operr(ldb);
1218         };
1219
1220         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1221         if (rdn_name == NULL) {
1222                 talloc_free(tmp_ctx);
1223                 return ldb_operr(ldb);
1224         }
1225         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1226                                                           rdn_name);
1227         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1228                                    &new_node, &new_node)) {
1229                 talloc_free(tmp_ctx);
1230                 return ldb_operr(ldb);
1231         };
1232
1233         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1234
1235         if (ret != LDB_SUCCESS) {
1236                 talloc_free(tmp_ctx);
1237                 return ldb_operr(ldb);
1238         }
1239         /* Theoretically we pass the check if the object has no sd */
1240         if (!sd) {
1241                 talloc_free(tmp_ctx);
1242                 return LDB_SUCCESS;
1243         }
1244         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1245         status = sec_access_check_ds(sd, acl_user_token(module),
1246                                      SEC_ADS_WRITE_PROP,
1247                                      &access_granted,
1248                                      root,
1249                                      sid);
1250
1251         if (!NT_STATUS_IS_OK(status)) {
1252                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1253                                        "Object %s has no wp on name\n",
1254                                        ldb_dn_get_linearized(req->op.rename.olddn));
1255                 dsdb_acl_debug(sd,
1256                           acl_user_token(module),
1257                           req->op.rename.olddn,
1258                           true,
1259                           10);
1260                 talloc_free(tmp_ctx);
1261                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1262         }
1263
1264         if (ldb_dn_compare(oldparent, newparent) == 0) {
1265                 /* regular rename, not move, nothing more to do */
1266                 talloc_free(tmp_ctx);
1267                 return ldb_next_request(module, req);
1268         }
1269
1270         /* new parent should have create child */
1271         root = NULL;
1272         new_node = NULL;
1273         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1274         if (!guid) {
1275                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1276                                        "acl:renamed object has no object class\n");
1277                 talloc_free(tmp_ctx);
1278                 return ldb_module_done(req, NULL, NULL,  LDB_ERR_OPERATIONS_ERROR);
1279         }
1280
1281         ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid, req);
1282         if (ret != LDB_SUCCESS) {
1283                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1284                                        "acl:access_denied renaming %s",
1285                                        ldb_dn_get_linearized(req->op.rename.olddn));
1286                 talloc_free(tmp_ctx);
1287                 return ret;
1288         }
1289         /* do we have delete object on the object? */
1290
1291         status = sec_access_check_ds(sd, acl_user_token(module),
1292                                      SEC_STD_DELETE,
1293                                      &access_granted,
1294                                      NULL,
1295                                      sid);
1296
1297         if (NT_STATUS_IS_OK(status)) {
1298                 talloc_free(tmp_ctx);
1299                 return ldb_next_request(module, req);
1300         }
1301         /* what about delete child on the current parent */
1302         ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL, req);
1303         if (ret != LDB_SUCCESS) {
1304                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1305                                        "acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn));
1306                 talloc_free(tmp_ctx);
1307                 return ldb_module_done(req, NULL, NULL, ret);
1308         }
1309
1310         talloc_free(tmp_ctx);
1311
1312         return ldb_next_request(module, req);
1313 }
1314
1315 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1316 {
1317         struct ldb_context *ldb;
1318         struct acl_context *ac;
1319         struct acl_private *data;
1320         struct ldb_result *acl_res;
1321         static const char *acl_attrs[] = {
1322                 "objectClass",
1323                 "nTSecurityDescriptor",
1324                 "objectSid",
1325                 NULL
1326         };
1327         int ret;
1328         unsigned int i;
1329
1330         ac = talloc_get_type(req->context, struct acl_context);
1331         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1332         ldb = ldb_module_get_ctx(ac->module);
1333
1334         if (!ares) {
1335                 return ldb_module_done(ac->req, NULL, NULL,
1336                                        LDB_ERR_OPERATIONS_ERROR);
1337         }
1338         if (ares->error != LDB_SUCCESS) {
1339                 return ldb_module_done(ac->req, ares->controls,
1340                                        ares->response, ares->error);
1341         }
1342
1343         switch (ares->type) {
1344         case LDB_REPLY_ENTRY:
1345                 if (ac->allowedAttributes
1346                     || ac->allowedChildClasses
1347                     || ac->allowedChildClassesEffective
1348                     || ac->allowedAttributesEffective
1349                     || ac->sDRightsEffective) {
1350                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1351                                                     acl_attrs,
1352                                                     DSDB_FLAG_NEXT_MODULE |
1353                                                     DSDB_SEARCH_SHOW_DELETED, req);
1354                         if (ret != LDB_SUCCESS) {
1355                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1356                         }
1357                         if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1358                                 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1359                                 if (ret != LDB_SUCCESS) {
1360                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1361                                 }
1362                         }
1363                         if (ac->allowedChildClasses) {
1364                                 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1365                                                        ares->message, "allowedChildClasses");
1366                                 if (ret != LDB_SUCCESS) {
1367                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1368                                 }
1369                         }
1370                         if (ac->allowedChildClassesEffective) {
1371                                 ret = acl_childClassesEffective(ac->module, ac->schema,
1372                                                                 acl_res->msgs[0], ares->message, ac);
1373                                 if (ret != LDB_SUCCESS) {
1374                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1375                                 }
1376                         }
1377                         if (ac->sDRightsEffective) {
1378                                 ret = acl_sDRightsEffective(ac->module,
1379                                                             acl_res->msgs[0], ares->message, ac);
1380                                 if (ret != LDB_SUCCESS) {
1381                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1382                                 }
1383                         }
1384                 }
1385                 if (data && data->password_attrs) {
1386                         if (!ac->am_system) {
1387                                 for (i = 0; data->password_attrs[i]; i++) {
1388                                         if ((!ac->userPassword) &&
1389                                             (ldb_attr_cmp(data->password_attrs[i],
1390                                                           "userPassword") == 0))
1391                                                 continue;
1392
1393                                         ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1394                                 }
1395                         }
1396                 }
1397                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1398
1399         case LDB_REPLY_REFERRAL:
1400                 return ldb_module_send_referral(ac->req, ares->referral);
1401
1402         case LDB_REPLY_DONE:
1403                 return ldb_module_done(ac->req, ares->controls,
1404                                        ares->response, LDB_SUCCESS);
1405
1406         }
1407         return LDB_SUCCESS;
1408 }
1409
1410 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1411 {
1412         struct ldb_context *ldb;
1413         struct acl_context *ac;
1414         struct ldb_request *down_req;
1415         struct acl_private *data;
1416         int ret;
1417         unsigned int i;
1418
1419         ldb = ldb_module_get_ctx(module);
1420
1421         ac = talloc_zero(req, struct acl_context);
1422         if (ac == NULL) {
1423                 return ldb_oom(ldb);
1424         }
1425         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1426
1427         ac->module = module;
1428         ac->req = req;
1429         ac->am_system = dsdb_module_am_system(module);
1430         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1431         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1432         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1433         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1434         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1435         ac->userPassword = dsdb_user_password_support(module, ac, req);
1436         ac->schema = dsdb_get_schema(ldb, ac);
1437
1438         /* replace any attributes in the parse tree that are private,
1439            so we don't allow a search for 'userPassword=penguin',
1440            just as we would not allow that attribute to be returned */
1441         if (ac->am_system) {
1442                 /* FIXME: We should copy the tree and keep the original unmodified. */
1443                 /* remove password attributes */
1444                 if (data && data->password_attrs) {
1445                         for (i = 0; data->password_attrs[i]; i++) {
1446                                 if ((!ac->userPassword) &&
1447                                     (ldb_attr_cmp(data->password_attrs[i],
1448                                                   "userPassword") == 0))
1449                                                 continue;
1450
1451                                 ldb_parse_tree_attr_replace(req->op.search.tree,
1452                                                             data->password_attrs[i],
1453                                                             "kludgeACLredactedattribute");
1454                         }
1455                 }
1456         }
1457         ret = ldb_build_search_req_ex(&down_req,
1458                                       ldb, ac,
1459                                       req->op.search.base,
1460                                       req->op.search.scope,
1461                                       req->op.search.tree,
1462                                       req->op.search.attrs,
1463                                       req->controls,
1464                                       ac, acl_search_callback,
1465                                       req);
1466         LDB_REQ_SET_LOCATION(down_req);
1467         if (ret != LDB_SUCCESS) {
1468                 return ret;
1469         }
1470         /* perform the search */
1471         return ldb_next_request(module, down_req);
1472 }
1473
1474 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1475 {
1476         struct ldb_context *ldb = ldb_module_get_ctx(module);
1477         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1478
1479         /* allow everybody to read the sequence number */
1480         if (strcmp(req->op.extended.oid,
1481                    LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1482                 return ldb_next_request(module, req);
1483         }
1484
1485         if (dsdb_module_am_system(module) ||
1486             dsdb_module_am_administrator(module) || as_system) {
1487                 return ldb_next_request(module, req);
1488         } else {
1489                 ldb_asprintf_errstring(ldb,
1490                                        "acl_extended: "
1491                                        "attempted database modify not permitted. "
1492                                        "User %s is not SYSTEM or an administrator",
1493                                        acl_user_name(req, module));
1494                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1495         }
1496 }
1497
1498 static const struct ldb_module_ops ldb_acl_module_ops = {
1499         .name              = "acl",
1500         .search            = acl_search,
1501         .add               = acl_add,
1502         .modify            = acl_modify,
1503         .del               = acl_delete,
1504         .rename            = acl_rename,
1505         .extended          = acl_extended,
1506         .init_context      = acl_module_init
1507 };
1508
1509 int ldb_acl_module_init(const char *version)
1510 {
1511         LDB_MODULE_CHECK_VERSION(version);
1512         return ldb_register_module(&ldb_acl_module_ops);
1513 }