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 *forest_name = samdb_forest_name(ldb, mem_ctx);
 453         const char *base_domain = samdb_default_domain_name(ldb, mem_ctx);
 454         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
 455                                                           struct loadparm_context);
 456         bool is_dc = (userAccountControl & UF_SERVER_TRUST_ACCOUNT) ||
 457                 (userAccountControl & UF_PARTIAL_SECRETS_ACCOUNT);
 458
 459         if (strcasecmp_m(spn_value, samAccountName) == 0) {
 460                 /* MacOS X sets this value, and setting an SPN of your
 461                  * own samAccountName is both pointless and safe */
 462                 return LDB_SUCCESS;
 463         }
 464
 465         kerr = smb_krb5_init_context_basic(mem_ctx,
 466                                            lp_ctx,
 467                                            &krb_ctx);
 468         if (kerr != 0) {
 469                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 470                                  "Could not initialize kerberos context.");
 471         }
 472
 473         ret = krb5_parse_name(krb_ctx, spn_value, &principal);
 474         if (ret) {
 475                 krb5_free_context(krb_ctx);
 476                 return LDB_ERR_CONSTRAINT_VIOLATION;
 477         }
 478
 479         if (principal->name.name_string.len < 2) {
 480                 goto fail;
 481         }
 482
 483         instanceName = principal->name.name_string.val[1];
 484         serviceType = principal->name.name_string.val[0];
 485         if (principal->name.name_string.len == 3) {
 486                 serviceName = principal->name.name_string.val[2];
 487         } else {
 488                 serviceName = NULL;
 489         }
 490
 491         if (serviceName) {
 492                 if (!is_dc) {
 493                         goto fail;
 494                 }
 495                 if (strcasecmp(serviceType, "ldap") == 0) {
 496                         if (strcasecmp(serviceName, netbios_name) != 0 &&
 497                             strcasecmp(serviceName, forest_name) != 0) {
 498                                 goto fail;
 499                         }
 500
 501                 } else if (strcasecmp(serviceType, "gc") == 0) {
 502                         if (strcasecmp(serviceName, forest_name) != 0) {
 503                                 goto fail;
 504                         }
 505                 } else {
 506                         if (strcasecmp(serviceName, base_domain) != 0 &&
 507                             strcasecmp(serviceName, netbios_name) != 0) {
 508                                 goto fail;
 509                         }
 510                 }
 511         }
 512         /* instanceName can be samAccountName without $ or dnsHostName
 513          * or "ntds_guid._msdcs.forest_domain for DC objects */
 514         if (strlen(instanceName) == (strlen(samAccountName) - 1)
 515             && strncasecmp(instanceName, samAccountName, strlen(samAccountName) - 1) == 0) {
 516                 goto success;
 517         } else if (dnsHostName != NULL && strcasecmp(instanceName, dnsHostName) == 0) {
 518                 goto success;
 519         } else if (is_dc) {
 520                 const char *guid_str;
 521                 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
 522                                            ntds_guid,
 523                                            forest_name);
 524                 if (strcasecmp(instanceName, guid_str) == 0) {
 525                         goto success;
 526                 }
 527         }
 528
 529 fail:
 530         krb5_free_principal(krb_ctx, principal);
 531         krb5_free_context(krb_ctx);
 532         return LDB_ERR_CONSTRAINT_VIOLATION;
 533
 534 success:
 535         krb5_free_principal(krb_ctx, principal);
 536         krb5_free_context(krb_ctx);
 537         return LDB_SUCCESS;
 538 }
 539
 540 static int acl_check_spn(TALLOC_CTX *mem_ctx,
 541                          struct ldb_module *module,
 542                          struct ldb_request *req,
 543                          struct security_descriptor *sd,
 544                          struct dom_sid *sid,
 545                          const struct GUID *oc_guid,
 546                          const struct dsdb_attribute *attr)
 547 {
 548         int ret;
 549         unsigned int i;
 550         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 551         struct ldb_context *ldb = ldb_module_get_ctx(module);
 552         struct ldb_result *acl_res;
 553         struct ldb_result *netbios_res;
 554         struct ldb_message_element *el;
 555         struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
 556         uint32_t userAccountControl;
 557         const char *samAccountName;
 558         const char *dnsHostName;
 559         const char *netbios_name;
 560         struct GUID ntds;
 561         char *ntds_guid = NULL;
 562
 563         static const char *acl_attrs[] = {
 564                 "samAccountName",
 565                 "dnsHostName",
 566                 "userAccountControl",
 567                 NULL
 568         };
 569         static const char *netbios_attrs[] = {
 570                 "nETBIOSName",
 571                 NULL
 572         };
 573
 574         /* if we have wp, we can do whatever we like */
 575         if (acl_check_access_on_attribute(module,
 576                                           tmp_ctx,
 577                                           sd,
 578                                           sid,
 579                                           SEC_ADS_WRITE_PROP,
 580                                           attr) == LDB_SUCCESS) {
 581                 talloc_free(tmp_ctx);
 582                 return LDB_SUCCESS;
 583         }
 584
 585         ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 586                                        GUID_DRS_VALIDATE_SPN,
 587                                        SEC_ADS_SELF_WRITE,
 588                                        sid);
 589
 590         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 591                 dsdb_acl_debug(sd, acl_user_token(module),
 592                                req->op.mod.message->dn,
 593                                true,
 594                                10);
 595                 talloc_free(tmp_ctx);
 596                 return ret;
 597         }
 598
 599         ret = dsdb_module_search_dn(module, tmp_ctx,
 600                                     &acl_res, req->op.mod.message->dn,
 601                                     acl_attrs,
 602                                     DSDB_FLAG_NEXT_MODULE |
 603                                     DSDB_SEARCH_SHOW_DELETED, req);
 604         if (ret != LDB_SUCCESS) {
 605                 talloc_free(tmp_ctx);
 606                 return ret;
 607         }
 608
 609         userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
 610         dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
 611         samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
 612
 613         ret = dsdb_module_search(module, tmp_ctx,
 614                                  &netbios_res, partitions_dn,
 615                                  LDB_SCOPE_ONELEVEL,
 616                                  netbios_attrs,
 617                                  DSDB_FLAG_NEXT_MODULE,
 618                                  req,
 619                                  "(ncName=%s)",
 620                                  ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
 621
 622         netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
 623
 624         el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
 625         if (!el) {
 626                 talloc_free(tmp_ctx);
 627                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 628                                          "Error finding element for servicePrincipalName.");
 629         }
 630
 631         /* NTDSDSA objectGuid of object we are checking SPN for */
 632         if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
 633                 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
 634                                                              req->op.mod.message->dn, &ntds, req);
 635                 if (ret != LDB_SUCCESS) {
 636                         ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
 637                                                ldb_dn_get_linearized(req->op.mod.message->dn),
 638                                                ldb_strerror(ret));
 639                         talloc_free(tmp_ctx);
 640                         return LDB_ERR_OPERATIONS_ERROR;
 641                 }
 642                 ntds_guid = GUID_string(tmp_ctx, &ntds);
 643         }
 644
 645         for (i=0; i < el->num_values; i++) {
 646                 ret = acl_validate_spn_value(tmp_ctx,
 647                                              ldb,
 648                                              (char *)el->values[i].data,
 649                                              userAccountControl,
 650                                              samAccountName,
 651                                              dnsHostName,
 652                                              netbios_name,
 653                                              ntds_guid);
 654                 if (ret != LDB_SUCCESS) {
 655                         talloc_free(tmp_ctx);
 656                         return ret;
 657                 }
 658         }
 659         talloc_free(tmp_ctx);
 660         return LDB_SUCCESS;
 661 }
 662
 663 static int acl_add(struct ldb_module *module, struct ldb_request *req)
 664 {
 665         int ret;
 666         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
 667         struct ldb_context *ldb;
 668         const struct dsdb_schema *schema;
 669         struct ldb_message_element *oc_el;
 670         const struct GUID *guid;
 671         struct ldb_dn *nc_root;
 672         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 673
 674         if (as_system != NULL) {
 675                 as_system->critical = 0;
 676         }
 677
 678         if (dsdb_module_am_system(module) || as_system) {
 679                 return ldb_next_request(module, req);
 680         }
 681         if (ldb_dn_is_special(req->op.add.message->dn)) {
 682                 return ldb_next_request(module, req);
 683         }
 684
 685         ldb = ldb_module_get_ctx(module);
 686
 687         /* Creating an NC. There is probably something we should do here,
 688          * but we will establish that later */
 689
 690         ret = dsdb_find_nc_root(ldb, req, req->op.add.message->dn, &nc_root);
 691         if (ret != LDB_SUCCESS) {
 692                 return ret;
 693         }
 694         if (ldb_dn_compare(nc_root, req->op.add.message->dn) == 0) {
 695                 talloc_free(nc_root);
 696                 return ldb_next_request(module, req);
 697         }
 698         talloc_free(nc_root);
 699
 700         schema = dsdb_get_schema(ldb, req);
 701         if (!schema) {
 702                 return ldb_operr(ldb);
 703         }
 704
 705         oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
 706         if (!oc_el || oc_el->num_values == 0) {
 707                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
 708                                        "acl: unable to find objectClass on %s\n",
 709                                        ldb_dn_get_linearized(req->op.add.message->dn));
 710                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 711         }
 712
 713         guid = class_schemaid_guid_by_lDAPDisplayName(schema,
 714                                                       (char *)oc_el->values[oc_el->num_values-1].data);
 715         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid, req);
 716         if (ret != LDB_SUCCESS) {
 717                 return ret;
 718         }
 719         return ldb_next_request(module, req);
 720 }
 721
 722 /* ckecks if modifications are allowed on "Member" attribute */
 723 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
 724                                      struct ldb_module *module,
 725                                      struct ldb_request *req,
 726                                      struct security_descriptor *sd,
 727                                      struct dom_sid *sid,
 728                                      const struct GUID *oc_guid,
 729                                      const struct dsdb_attribute *attr)
 730 {
 731         int ret;
 732         unsigned int i;
 733         struct ldb_context *ldb = ldb_module_get_ctx(module);
 734         struct ldb_dn *user_dn;
 735         struct ldb_message_element *member_el;
 736         /* if we have wp, we can do whatever we like */
 737         if (acl_check_access_on_attribute(module,
 738                                           mem_ctx,
 739                                           sd,
 740                                           sid,
 741                                           SEC_ADS_WRITE_PROP,
 742                                           attr) == LDB_SUCCESS) {
 743                 return LDB_SUCCESS;
 744         }
 745         /* if we are adding/deleting ourselves, check for self membership */
 746         ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
 747                                   &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
 748                                   &user_dn);
 749         if (ret != LDB_SUCCESS) {
 750                 return ret;
 751         }
 752         member_el = ldb_msg_find_element(req->op.mod.message, "member");
 753         if (!member_el) {
 754                 return ldb_operr(ldb);
 755         }
 756         /* user can only remove oneself */
 757         if (member_el->num_values == 0) {
 758                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 759         }
 760         for (i = 0; i < member_el->num_values; i++) {
 761                 if (strcasecmp((const char *)member_el->values[i].data,
 762                                ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
 763                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 764                 }
 765         }
 766         ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
 767                                        GUID_DRS_SELF_MEMBERSHIP,
 768                                        SEC_ADS_SELF_WRITE,
 769                                        sid);
 770         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 771                 dsdb_acl_debug(sd, acl_user_token(module),
 772                                req->op.mod.message->dn,
 773                                true,
 774                                10);
 775         }
 776         return ret;
 777 }
 778
 779 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
 780                                      struct ldb_module *module,
 781                                      struct ldb_request *req,
 782                                      struct security_descriptor *sd,
 783                                      struct dom_sid *sid,
 784                                      const struct GUID *oc_guid,
 785                                      bool userPassword)
 786 {
 787         int ret = LDB_SUCCESS;
 788         unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
 789         struct ldb_message_element *el;
 790         struct ldb_message *msg;
 791         const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
 792                                         "unicodePwd", "dBCSPwd", NULL }, **l;
 793         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 794
 795         msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
 796         if (msg == NULL) {
 797                 return ldb_module_oom(module);
 798         }
 799         for (l = passwordAttrs; *l != NULL; l++) {
 800                 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
 801                         continue;
 802                 }
 803
 804                 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
 805                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
 806                                 ++del_attr_cnt;
 807                         }
 808                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
 809                                 ++add_attr_cnt;
 810                         }
 811                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
 812                                 ++rep_attr_cnt;
 813                         }
 814                         ldb_msg_remove_element(msg, el);
 815                 }
 816         }
 817
 818         /* single deletes will be handled by the "password_hash" LDB module
 819          * later in the stack, so we let it though here */
 820         if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
 821                 talloc_free(tmp_ctx);
 822                 return LDB_SUCCESS;
 823         }
 824
 825         if (ldb_request_get_control(req,
 826                                     DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
 827                 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
 828                  * have a user password change and not a set as the message
 829                  * looks like. In it's value blob it contains the NT and/or LM
 830                  * hash of the old password specified by the user.
 831                  * This control is used by the SAMR and "kpasswd" password
 832                  * change mechanisms. */
 833                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 834                                                GUID_DRS_USER_CHANGE_PASSWORD,
 835                                                SEC_ADS_CONTROL_ACCESS,
 836                                                sid);
 837         }
 838         else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
 839                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 840                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
 841                                                SEC_ADS_CONTROL_ACCESS,
 842                                                sid);
 843         }
 844         else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
 845                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 846                                                GUID_DRS_USER_CHANGE_PASSWORD,
 847                                                SEC_ADS_CONTROL_ACCESS,
 848                                                sid);
 849                 /* Very strange, but we get constraint violation in this case */
 850                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 851                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
 852                 }
 853         }
 854         if (ret != LDB_SUCCESS) {
 855                 dsdb_acl_debug(sd, acl_user_token(module),
 856                                req->op.mod.message->dn,
 857                                true,
 858                                10);
 859         }
 860         talloc_free(tmp_ctx);
 861         return ret;
 862 }
 863
 864 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
 865 {
 866         int ret;
 867         struct ldb_context *ldb = ldb_module_get_ctx(module);
 868         const struct dsdb_schema *schema;
 869         unsigned int i;
 870         const struct GUID *guid;
 871         uint32_t access_granted;
 872         struct object_tree *root = NULL;
 873         struct object_tree *new_node = NULL;
 874         NTSTATUS status;
 875         struct ldb_result *acl_res;
 876         struct security_descriptor *sd;
 877         struct dom_sid *sid = NULL;
 878         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 879         bool userPassword = dsdb_user_password_support(module, req, req);
 880         TALLOC_CTX *tmp_ctx = talloc_new(req);
 881         static const char *acl_attrs[] = {
 882                 "nTSecurityDescriptor",
 883                 "objectClass",
 884                 "objectSid",
 885                 NULL
 886         };
 887
 888         if (as_system != NULL) {
 889                 as_system->critical = 0;
 890         }
 891
 892         /* Don't print this debug statement if elements[0].name is going to be NULL */
 893         if(req->op.mod.message->num_elements > 0)
 894         {
 895                 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
 896         }
 897         if (dsdb_module_am_system(module) || as_system) {
 898                 return ldb_next_request(module, req);
 899         }
 900         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 901                 return ldb_next_request(module, req);
 902         }
 903         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
 904                                     acl_attrs,
 905                                     DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED,
 906                                     req);
 907
 908         if (ret != LDB_SUCCESS) {
 909                 goto fail;
 910         }
 911
 912         schema = dsdb_get_schema(ldb, tmp_ctx);
 913         if (!schema) {
 914                 ret = LDB_ERR_OPERATIONS_ERROR;
 915                 goto fail;
 916         }
 917
 918         ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
 919         if (ret != LDB_SUCCESS) {
 920                 talloc_free(tmp_ctx);
 921                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 922                                  "acl_modify: Error retrieving security descriptor.");
 923         }
 924         /* Theoretically we pass the check if the object has no sd */
 925         if (!sd) {
 926                 goto success;
 927         }
 928
 929         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
 930         if (!guid) {
 931                 talloc_free(tmp_ctx);
 932                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 933                                  "acl_modify: Error retrieving object class GUID.");
 934         }
 935         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
 936         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 937                                    &root, &new_node)) {
 938                 talloc_free(tmp_ctx);
 939                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 940                                  "acl_modify: Error adding new node in object tree.");
 941         }
 942         for (i=0; i < req->op.mod.message->num_elements; i++){
 943                 const struct dsdb_attribute *attr;
 944                 attr = dsdb_attribute_by_lDAPDisplayName(schema,
 945                                                          req->op.mod.message->elements[i].name);
 946
 947                 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
 948                         status = sec_access_check_ds(sd, acl_user_token(module),
 949                                              SEC_STD_WRITE_DAC,
 950                                              &access_granted,
 951                                              NULL,
 952                                              sid);
 953
 954                         if (!NT_STATUS_IS_OK(status)) {
 955                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
 956                                                        "Object %s has no write dacl access\n",
 957                                                        ldb_dn_get_linearized(req->op.mod.message->dn));
 958                                 dsdb_acl_debug(sd,
 959                                                acl_user_token(module),
 960                                                req->op.mod.message->dn,
 961                                                true,
 962                                                10);
 963                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 964                                 goto fail;
 965                         }
 966                 }
 967                 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
 968                         ret = acl_check_self_membership(tmp_ctx,
 969                                                         module,
 970                                                         req,
 971                                                         sd,
 972                                                         sid,
 973                                                         guid,
 974                                                         attr);
 975                         if (ret != LDB_SUCCESS) {
 976                                 goto fail;
 977                         }
 978                 }
 979                 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
 980                         /* this one is not affected by any rights, we should let it through
 981                            so that passwords_hash returns the correct error */
 982                         continue;
 983                 }
 984                 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
 985                          (userPassword && ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0) ||
 986                          ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
 987                         ret = acl_check_password_rights(tmp_ctx,
 988                                                         module,
 989                                                         req,
 990                                                         sd,
 991                                                         sid,
 992                                                         guid,
 993                                                         userPassword);
 994                         if (ret != LDB_SUCCESS) {
 995                                 goto fail;
 996                         }
 997                 } else if (ldb_attr_cmp("servicePrincipalName", req->op.mod.message->elements[i].name) == 0) {
 998                         ret = acl_check_spn(tmp_ctx,
 999                                             module,
1000                                             req,
1001                                             sd,
1002                                             sid,
1003                                             guid,
1004                                             attr);
1005                         if (ret != LDB_SUCCESS) {
1006                                 goto fail;
1007                         }
1008                 } else {
1009
1010                 /* This basic attribute existence check with the right errorcode
1011                  * is needed since this module is the first one which requests
1012                  * schema attribute information.
1013                  * The complete attribute checking is done in the
1014                  * "objectclass_attrs" module behind this one.
1015                  */
1016                         if (!attr) {
1017                                 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
1018                                                        req->op.mod.message->elements[i].name,
1019                                                ldb_dn_get_linearized(req->op.mod.message->dn));
1020                                 ret =  LDB_ERR_NO_SUCH_ATTRIBUTE;
1021                                 goto fail;
1022                         }
1023                         if (!insert_in_object_tree(tmp_ctx,
1024                                                    &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
1025                                                    &new_node, &new_node)) {
1026                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1027                                                        "acl_modify: cannot add to object tree securityGUID\n");
1028                                 ret = LDB_ERR_OPERATIONS_ERROR;
1029                                 goto fail;
1030                         }
1031
1032                         if (!insert_in_object_tree(tmp_ctx,
1033                                                    &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
1034                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1035                                                        "acl_modify: cannot add to object tree attributeGUID\n");
1036                                 ret = LDB_ERR_OPERATIONS_ERROR;
1037                                 goto fail;
1038                         }
1039                 }
1040         }
1041
1042         if (root->num_of_children > 0) {
1043                 status = sec_access_check_ds(sd, acl_user_token(module),
1044                                              SEC_ADS_WRITE_PROP,
1045                                              &access_granted,
1046                                              root,
1047                                              sid);
1048
1049                 if (!NT_STATUS_IS_OK(status)) {
1050                         ldb_asprintf_errstring(ldb_module_get_ctx(module),
1051                                                "Object %s has no write property access\n",
1052                                                ldb_dn_get_linearized(req->op.mod.message->dn));
1053                         dsdb_acl_debug(sd,
1054                                        acl_user_token(module),
1055                                        req->op.mod.message->dn,
1056                                        true,
1057                                        10);
1058                         ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1059                         goto fail;
1060                 }
1061         }
1062
1063 success:
1064         talloc_free(tmp_ctx);
1065         return ldb_next_request(module, req);
1066 fail:
1067         talloc_free(tmp_ctx);
1068         return ret;
1069 }
1070
1071 /* similar to the modify for the time being.
1072  * We need to consider the special delete tree case, though - TODO */
1073 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1074 {
1075         int ret;
1076         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
1077         struct ldb_context *ldb;
1078         struct ldb_dn *nc_root;
1079         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1080
1081         if (as_system != NULL) {
1082                 as_system->critical = 0;
1083         }
1084
1085         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1086         if (dsdb_module_am_system(module) || as_system) {
1087                 return ldb_next_request(module, req);
1088         }
1089         if (ldb_dn_is_special(req->op.del.dn)) {
1090                 return ldb_next_request(module, req);
1091         }
1092
1093         ldb = ldb_module_get_ctx(module);
1094
1095         /* Make sure we aren't deleting a NC */
1096
1097         ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1098         if (ret != LDB_SUCCESS) {
1099                 return ret;
1100         }
1101         if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1102                 talloc_free(nc_root);
1103                 DEBUG(10,("acl:deleting a NC\n"));
1104                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1105                 return ldb_module_done(req, NULL, NULL,
1106                                        LDB_ERR_UNWILLING_TO_PERFORM);
1107         }
1108         talloc_free(nc_root);
1109
1110         /* First check if we have delete object right */
1111         ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn,
1112                                              SEC_STD_DELETE, NULL, req);
1113         if (ret == LDB_SUCCESS) {
1114                 return ldb_next_request(module, req);
1115         }
1116
1117         /* Nope, we don't have delete object. Lets check if we have delete
1118          * child on the parent */
1119         ret = dsdb_module_check_access_on_dn(module, req, parent,
1120                                              SEC_ADS_DELETE_CHILD, NULL, req);
1121         if (ret != LDB_SUCCESS) {
1122                 return ret;
1123         }
1124
1125         return ldb_next_request(module, req);
1126 }
1127
1128 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1129 {
1130         int ret;
1131         struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
1132         struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
1133         const struct dsdb_schema *schema;
1134         struct ldb_context *ldb;
1135         struct security_descriptor *sd = NULL;
1136         struct dom_sid *sid = NULL;
1137         struct ldb_result *acl_res;
1138         const struct GUID *guid;
1139         struct ldb_dn *nc_root;
1140         struct object_tree *root = NULL;
1141         struct object_tree *new_node = NULL;
1142         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1143         TALLOC_CTX *tmp_ctx = talloc_new(req);
1144         NTSTATUS status;
1145         uint32_t access_granted;
1146         const char *rdn_name;
1147         static const char *acl_attrs[] = {
1148                 "nTSecurityDescriptor",
1149                 "objectClass",
1150                 "objectSid",
1151                 NULL
1152         };
1153
1154         if (as_system != NULL) {
1155                 as_system->critical = 0;
1156         }
1157
1158         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1159         if (dsdb_module_am_system(module) || as_system) {
1160                 return ldb_next_request(module, req);
1161         }
1162         if (ldb_dn_is_special(req->op.rename.olddn)) {
1163                 return ldb_next_request(module, req);
1164         }
1165
1166         ldb = ldb_module_get_ctx(module);
1167
1168         /* Make sure we aren't renaming/moving a NC */
1169
1170         ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1171         if (ret != LDB_SUCCESS) {
1172                 return ret;
1173         }
1174         if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1175                 talloc_free(nc_root);
1176                 DEBUG(10,("acl:renaming/moving a NC\n"));
1177                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1178                 return ldb_module_done(req, NULL, NULL,
1179                                        LDB_ERR_UNWILLING_TO_PERFORM);
1180         }
1181         talloc_free(nc_root);
1182
1183         /* Look for the parent */
1184
1185         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1186                                     req->op.rename.olddn, acl_attrs,
1187                                     DSDB_FLAG_NEXT_MODULE |
1188                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1189         /* we sould be able to find the parent */
1190         if (ret != LDB_SUCCESS) {
1191                 DEBUG(10,("acl: failed to find object %s\n",
1192                           ldb_dn_get_linearized(req->op.rename.olddn)));
1193                 talloc_free(tmp_ctx);
1194                 return ret;
1195         }
1196
1197         schema = dsdb_get_schema(ldb, acl_res);
1198         if (!schema) {
1199                 talloc_free(tmp_ctx);
1200                 return ldb_operr(ldb);
1201         }
1202
1203         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1204         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1205                                    &root, &new_node)) {
1206                 talloc_free(tmp_ctx);
1207                 return ldb_operr(ldb);
1208         };
1209
1210         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1211                                                           "name");
1212         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1213                                    &new_node, &new_node)) {
1214                 talloc_free(tmp_ctx);
1215                 return ldb_operr(ldb);
1216         };
1217
1218         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1219         if (rdn_name == NULL) {
1220                 talloc_free(tmp_ctx);
1221                 return ldb_operr(ldb);
1222         }
1223         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1224                                                           rdn_name);
1225         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1226                                    &new_node, &new_node)) {
1227                 talloc_free(tmp_ctx);
1228                 return ldb_operr(ldb);
1229         };
1230
1231         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1232
1233         if (ret != LDB_SUCCESS) {
1234                 talloc_free(tmp_ctx);
1235                 return ldb_operr(ldb);
1236         }
1237         /* Theoretically we pass the check if the object has no sd */
1238         if (!sd) {
1239                 talloc_free(tmp_ctx);
1240                 return LDB_SUCCESS;
1241         }
1242         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1243         status = sec_access_check_ds(sd, acl_user_token(module),
1244                                      SEC_ADS_WRITE_PROP,
1245                                      &access_granted,
1246                                      root,
1247                                      sid);
1248
1249         if (!NT_STATUS_IS_OK(status)) {
1250                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1251                                        "Object %s has no wp on name\n",
1252                                        ldb_dn_get_linearized(req->op.rename.olddn));
1253                 dsdb_acl_debug(sd,
1254                           acl_user_token(module),
1255                           req->op.rename.olddn,
1256                           true,
1257                           10);
1258                 talloc_free(tmp_ctx);
1259                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1260         }
1261
1262         if (ldb_dn_compare(oldparent, newparent) == 0) {
1263                 /* regular rename, not move, nothing more to do */
1264                 talloc_free(tmp_ctx);
1265                 return ldb_next_request(module, req);
1266         }
1267
1268         /* new parent should have create child */
1269         root = NULL;
1270         new_node = NULL;
1271         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1272         if (!guid) {
1273                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1274                                        "acl:renamed object has no object class\n");
1275                 talloc_free(tmp_ctx);
1276                 return ldb_module_done(req, NULL, NULL,  LDB_ERR_OPERATIONS_ERROR);
1277         }
1278
1279         ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid, req);
1280         if (ret != LDB_SUCCESS) {
1281                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1282                                        "acl:access_denied renaming %s",
1283                                        ldb_dn_get_linearized(req->op.rename.olddn));
1284                 talloc_free(tmp_ctx);
1285                 return ret;
1286         }
1287         /* do we have delete object on the object? */
1288
1289         status = sec_access_check_ds(sd, acl_user_token(module),
1290                                      SEC_STD_DELETE,
1291                                      &access_granted,
1292                                      NULL,
1293                                      sid);
1294
1295         if (NT_STATUS_IS_OK(status)) {
1296                 talloc_free(tmp_ctx);
1297                 return ldb_next_request(module, req);
1298         }
1299         /* what about delete child on the current parent */
1300         ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL, req);
1301         if (ret != LDB_SUCCESS) {
1302                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1303                                        "acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn));
1304                 talloc_free(tmp_ctx);
1305                 return ldb_module_done(req, NULL, NULL, ret);
1306         }
1307
1308         talloc_free(tmp_ctx);
1309
1310         return ldb_next_request(module, req);
1311 }
1312
1313 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1314 {
1315         struct acl_context *ac;
1316         struct acl_private *data;
1317         struct ldb_result *acl_res;
1318         static const char *acl_attrs[] = {
1319                 "objectClass",
1320                 "nTSecurityDescriptor",
1321                 "objectSid",
1322                 NULL
1323         };
1324         int ret;
1325         unsigned int i;
1326
1327         ac = talloc_get_type(req->context, struct acl_context);
1328         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1329         if (!ares) {
1330                 return ldb_module_done(ac->req, NULL, NULL,
1331                                        LDB_ERR_OPERATIONS_ERROR);
1332         }
1333         if (ares->error != LDB_SUCCESS) {
1334                 return ldb_module_done(ac->req, ares->controls,
1335                                        ares->response, ares->error);
1336         }
1337
1338         switch (ares->type) {
1339         case LDB_REPLY_ENTRY:
1340                 if (ac->allowedAttributes
1341                     || ac->allowedChildClasses
1342                     || ac->allowedChildClassesEffective
1343                     || ac->allowedAttributesEffective
1344                     || ac->sDRightsEffective) {
1345                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1346                                                     acl_attrs,
1347                                                     DSDB_FLAG_NEXT_MODULE |
1348                                                     DSDB_SEARCH_SHOW_DELETED, req);
1349                         if (ret != LDB_SUCCESS) {
1350                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1351                         }
1352                         if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1353                                 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1354                                 if (ret != LDB_SUCCESS) {
1355                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1356                                 }
1357                         }
1358                         if (ac->allowedChildClasses) {
1359                                 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1360                                                        ares->message, "allowedChildClasses");
1361                                 if (ret != LDB_SUCCESS) {
1362                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1363                                 }
1364                         }
1365                         if (ac->allowedChildClassesEffective) {
1366                                 ret = acl_childClassesEffective(ac->module, ac->schema,
1367                                                                 acl_res->msgs[0], ares->message, ac);
1368                                 if (ret != LDB_SUCCESS) {
1369                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1370                                 }
1371                         }
1372                         if (ac->sDRightsEffective) {
1373                                 ret = acl_sDRightsEffective(ac->module,
1374                                                             acl_res->msgs[0], ares->message, ac);
1375                                 if (ret != LDB_SUCCESS) {
1376                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1377                                 }
1378                         }
1379                 }
1380                 if (data && data->password_attrs) {
1381                         if (!ac->am_system) {
1382                                 for (i = 0; data->password_attrs[i]; i++) {
1383                                         if ((!ac->userPassword) &&
1384                                             (ldb_attr_cmp(data->password_attrs[i],
1385                                                           "userPassword") == 0))
1386                                                 continue;
1387
1388                                         ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1389                                 }
1390                         }
1391                 }
1392                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1393
1394         case LDB_REPLY_REFERRAL:
1395                 return ldb_module_send_referral(ac->req, ares->referral);
1396
1397         case LDB_REPLY_DONE:
1398                 return ldb_module_done(ac->req, ares->controls,
1399                                        ares->response, LDB_SUCCESS);
1400
1401         }
1402         return LDB_SUCCESS;
1403 }
1404
1405 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1406 {
1407         struct ldb_context *ldb;
1408         struct acl_context *ac;
1409         struct ldb_request *down_req;
1410         struct acl_private *data;
1411         int ret;
1412         unsigned int i;
1413
1414         ldb = ldb_module_get_ctx(module);
1415
1416         ac = talloc_zero(req, struct acl_context);
1417         if (ac == NULL) {
1418                 return ldb_oom(ldb);
1419         }
1420         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1421
1422         ac->module = module;
1423         ac->req = req;
1424         ac->am_system = dsdb_module_am_system(module);
1425         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1426         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1427         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1428         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1429         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1430         ac->userPassword = dsdb_user_password_support(module, ac, req);
1431         ac->schema = dsdb_get_schema(ldb, ac);
1432
1433         /* replace any attributes in the parse tree that are private,
1434            so we don't allow a search for 'userPassword=penguin',
1435            just as we would not allow that attribute to be returned */
1436         if (ac->am_system) {
1437                 /* FIXME: We should copy the tree and keep the original unmodified. */
1438                 /* remove password attributes */
1439                 if (data && data->password_attrs) {
1440                         for (i = 0; data->password_attrs[i]; i++) {
1441                                 if ((!ac->userPassword) &&
1442                                     (ldb_attr_cmp(data->password_attrs[i],
1443                                                   "userPassword") == 0))
1444                                                 continue;
1445
1446                                 ldb_parse_tree_attr_replace(req->op.search.tree,
1447                                                             data->password_attrs[i],
1448                                                             "kludgeACLredactedattribute");
1449                         }
1450                 }
1451         }
1452         ret = ldb_build_search_req_ex(&down_req,
1453                                       ldb, ac,
1454                                       req->op.search.base,
1455                                       req->op.search.scope,
1456                                       req->op.search.tree,
1457                                       req->op.search.attrs,
1458                                       req->controls,
1459                                       ac, acl_search_callback,
1460                                       req);
1461         LDB_REQ_SET_LOCATION(down_req);
1462         if (ret != LDB_SUCCESS) {
1463                 return ret;
1464         }
1465         /* perform the search */
1466         return ldb_next_request(module, down_req);
1467 }
1468
1469 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1470 {
1471         struct ldb_context *ldb = ldb_module_get_ctx(module);
1472         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1473
1474         /* allow everybody to read the sequence number */
1475         if (strcmp(req->op.extended.oid,
1476                    LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1477                 return ldb_next_request(module, req);
1478         }
1479
1480         if (dsdb_module_am_system(module) ||
1481             dsdb_module_am_administrator(module) || as_system) {
1482                 return ldb_next_request(module, req);
1483         } else {
1484                 ldb_asprintf_errstring(ldb,
1485                                        "acl_extended: "
1486                                        "attempted database modify not permitted. "
1487                                        "User %s is not SYSTEM or an administrator",
1488                                        acl_user_name(req, module));
1489                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1490         }
1491 }
1492
1493 static const struct ldb_module_ops ldb_acl_module_ops = {
1494         .name              = "acl",
1495         .search            = acl_search,
1496         .add               = acl_add,
1497         .modify            = acl_modify,
1498         .del               = acl_delete,
1499         .rename            = acl_rename,
1500         .extended          = acl_extended,
1501         .init_context      = acl_module_init
1502 };
1503
1504 int ldb_acl_module_init(const char *version)
1505 {
1506         LDB_MODULE_CHECK_VERSION(version);
1507         return ldb_register_module(&ldb_acl_module_ops);
1508 }