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         instanceName = principal->name.name_string.val[1];
 481         serviceType = principal->name.name_string.val[0];
 482         realm = krb5_principal_get_realm(krb_ctx, principal);
 483         if (principal->name.name_string.len == 3) {
 484                 serviceName = principal->name.name_string.val[2];
 485         } else {
 486                 serviceName = NULL;
 487         }
 488
 489         if (serviceName) {
 490                 if (!is_dc) {
 491                         goto fail;
 492                 }
 493                 if (strcasecmp(serviceType, "ldap") == 0) {
 494                         if (strcasecmp(serviceName, netbios_name) != 0 &&
 495                             strcasecmp(serviceName, forest_name) != 0) {
 496                                 goto fail;
 497                         }
 498
 499                 } else if (strcasecmp(serviceType, "gc") == 0) {
 500                         if (strcasecmp(serviceName, forest_name) != 0) {
 501                                 goto fail;
 502                         }
 503                 } else {
 504                         if (strcasecmp(serviceName, base_domain) != 0 &&
 505                             strcasecmp(serviceName, netbios_name) != 0) {
 506                                 goto fail;
 507                         }
 508                 }
 509         }
 510         /* instanceName can be samAccountName without $ or dnsHostName
 511          * or "ntds_guid._msdcs.forest_domain for DC objects */
 512         if (strncasecmp(instanceName, samAccountName, strlen(samAccountName) - 1) == 0) {
 513                 goto success;
 514         } else if (strcasecmp(instanceName, dnsHostName) == 0) {
 515                 goto success;
 516         } else if (is_dc) {
 517                 const char *guid_str;
 518                 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
 519                                            ntds_guid,
 520                                            forest_name);
 521                 if (strcasecmp(instanceName, guid_str) == 0) {
 522                         goto success;
 523                 }
 524         }
 525
 526 fail:
 527         krb5_free_principal(krb_ctx, principal);
 528         krb5_free_context(krb_ctx);
 529         return LDB_ERR_CONSTRAINT_VIOLATION;
 530
 531 success:
 532         krb5_free_principal(krb_ctx, principal);
 533         krb5_free_context(krb_ctx);
 534         return LDB_SUCCESS;
 535 }
 536
 537 static int acl_check_spn(TALLOC_CTX *mem_ctx,
 538                          struct ldb_module *module,
 539                          struct ldb_request *req,
 540                          struct security_descriptor *sd,
 541                          struct dom_sid *sid,
 542                          const struct GUID *oc_guid,
 543                          const struct dsdb_attribute *attr)
 544 {
 545         int ret;
 546         unsigned int i;
 547         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 548         struct ldb_context *ldb = ldb_module_get_ctx(module);
 549         struct ldb_result *acl_res;
 550         struct ldb_result *netbios_res;
 551         struct ldb_message_element *el;
 552         struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
 553         uint32_t userAccountControl;
 554         const char *samAccountName;
 555         const char *dnsHostName;
 556         const char *netbios_name;
 557         struct GUID ntds;
 558         char *ntds_guid = NULL;
 559
 560         static const char *acl_attrs[] = {
 561                 "samAccountName",
 562                 "dnsHostName",
 563                 "userAccountControl",
 564                 NULL
 565         };
 566         static const char *netbios_attrs[] = {
 567                 "nETBIOSName",
 568                 NULL
 569         };
 570
 571         /* if we have wp, we can do whatever we like */
 572         if (acl_check_access_on_attribute(module,
 573                                           tmp_ctx,
 574                                           sd,
 575                                           sid,
 576                                           SEC_ADS_WRITE_PROP,
 577                                           attr) == LDB_SUCCESS) {
 578                 talloc_free(tmp_ctx);
 579                 return LDB_SUCCESS;
 580         }
 581
 582         ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 583                                        GUID_DRS_VALIDATE_SPN,
 584                                        SEC_ADS_SELF_WRITE,
 585                                        sid);
 586
 587         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 588                 dsdb_acl_debug(sd, acl_user_token(module),
 589                                req->op.mod.message->dn,
 590                                true,
 591                                10);
 592                 talloc_free(tmp_ctx);
 593                 return ret;
 594         }
 595
 596         ret = dsdb_module_search_dn(module, tmp_ctx,
 597                                     &acl_res, req->op.mod.message->dn,
 598                                     acl_attrs,
 599                                     DSDB_FLAG_NEXT_MODULE |
 600                                     DSDB_SEARCH_SHOW_DELETED, req);
 601         if (ret != LDB_SUCCESS) {
 602                 talloc_free(tmp_ctx);
 603                 return ret;
 604         }
 605
 606         userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
 607         dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
 608         samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
 609
 610         ret = dsdb_module_search(module, tmp_ctx,
 611                                  &netbios_res, partitions_dn,
 612                                  LDB_SCOPE_ONELEVEL,
 613                                  netbios_attrs,
 614                                  DSDB_FLAG_NEXT_MODULE,
 615                                  req,
 616                                  "(ncName=%s)",
 617                                  ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
 618
 619         netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
 620
 621         el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
 622         if (!el) {
 623                 talloc_free(tmp_ctx);
 624                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 625                                          "Error finding element for servicePrincipalName.");
 626         }
 627
 628         /* NTDSDSA objectGuid of object we are checking SPN for */
 629         if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
 630                 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
 631                                                              req->op.mod.message->dn, &ntds, req);
 632                 if (ret != LDB_SUCCESS) {
 633                         ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
 634                                                ldb_dn_get_linearized(req->op.mod.message->dn),
 635                                                ldb_strerror(ret));
 636                         talloc_free(tmp_ctx);
 637                         return LDB_ERR_OPERATIONS_ERROR;
 638                 }
 639                 ntds_guid = GUID_string(tmp_ctx, &ntds);
 640         }
 641
 642         for (i=0; i < el->num_values; i++) {
 643                 ret = acl_validate_spn_value(tmp_ctx,
 644                                              ldb,
 645                                              (char *)el->values[i].data,
 646                                              userAccountControl,
 647                                              samAccountName,
 648                                              dnsHostName,
 649                                              netbios_name,
 650                                              ntds_guid);
 651                 if (ret != LDB_SUCCESS) {
 652                         talloc_free(tmp_ctx);
 653                         return ret;
 654                 }
 655         }
 656         talloc_free(tmp_ctx);
 657         return LDB_SUCCESS;
 658 }
 659
 660 static int acl_add(struct ldb_module *module, struct ldb_request *req)
 661 {
 662         int ret;
 663         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
 664         struct ldb_context *ldb;
 665         const struct dsdb_schema *schema;
 666         struct ldb_message_element *oc_el;
 667         const struct GUID *guid;
 668         struct ldb_dn *nc_root;
 669         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 670
 671         if (as_system != NULL) {
 672                 as_system->critical = 0;
 673         }
 674
 675         if (dsdb_module_am_system(module) || as_system) {
 676                 return ldb_next_request(module, req);
 677         }
 678         if (ldb_dn_is_special(req->op.add.message->dn)) {
 679                 return ldb_next_request(module, req);
 680         }
 681
 682         ldb = ldb_module_get_ctx(module);
 683
 684         /* Creating an NC. There is probably something we should do here,
 685          * but we will establish that later */
 686
 687         ret = dsdb_find_nc_root(ldb, req, req->op.add.message->dn, &nc_root);
 688         if (ret != LDB_SUCCESS) {
 689                 return ret;
 690         }
 691         if (ldb_dn_compare(nc_root, req->op.add.message->dn) == 0) {
 692                 talloc_free(nc_root);
 693                 return ldb_next_request(module, req);
 694         }
 695         talloc_free(nc_root);
 696
 697         schema = dsdb_get_schema(ldb, req);
 698         if (!schema) {
 699                 return ldb_operr(ldb);
 700         }
 701
 702         oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
 703         if (!oc_el || oc_el->num_values == 0) {
 704                 DEBUG(10,("acl:operation error %s\n", ldb_dn_get_linearized(req->op.add.message->dn)));
 705                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 706         }
 707
 708         guid = class_schemaid_guid_by_lDAPDisplayName(schema,
 709                                                       (char *)oc_el->values[oc_el->num_values-1].data);
 710         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid, req);
 711         if (ret != LDB_SUCCESS) {
 712                 return ret;
 713         }
 714         return ldb_next_request(module, req);
 715 }
 716
 717 /* ckecks if modifications are allowed on "Member" attribute */
 718 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
 719                                      struct ldb_module *module,
 720                                      struct ldb_request *req,
 721                                      struct security_descriptor *sd,
 722                                      struct dom_sid *sid,
 723                                      const struct GUID *oc_guid,
 724                                      const struct dsdb_attribute *attr)
 725 {
 726         int ret;
 727         unsigned int i;
 728         struct ldb_context *ldb = ldb_module_get_ctx(module);
 729         struct ldb_dn *user_dn;
 730         struct ldb_message_element *member_el;
 731         /* if we have wp, we can do whatever we like */
 732         if (acl_check_access_on_attribute(module,
 733                                           mem_ctx,
 734                                           sd,
 735                                           sid,
 736                                           SEC_ADS_WRITE_PROP,
 737                                           attr) == LDB_SUCCESS) {
 738                 return LDB_SUCCESS;
 739         }
 740         /* if we are adding/deleting ourselves, check for self membership */
 741         ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
 742                                   &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
 743                                   &user_dn);
 744         if (ret != LDB_SUCCESS) {
 745                 return ret;
 746         }
 747         member_el = ldb_msg_find_element(req->op.mod.message, "member");
 748         if (!member_el) {
 749                 return ldb_operr(ldb);
 750         }
 751         /* user can only remove oneself */
 752         if (member_el->num_values == 0) {
 753                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 754         }
 755         for (i = 0; i < member_el->num_values; i++) {
 756                 if (strcasecmp((const char *)member_el->values[i].data,
 757                                ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
 758                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 759                 }
 760         }
 761         ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
 762                                        GUID_DRS_SELF_MEMBERSHIP,
 763                                        SEC_ADS_SELF_WRITE,
 764                                        sid);
 765         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 766                 dsdb_acl_debug(sd, acl_user_token(module),
 767                                req->op.mod.message->dn,
 768                                true,
 769                                10);
 770         }
 771         return ret;
 772 }
 773
 774 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
 775                                      struct ldb_module *module,
 776                                      struct ldb_request *req,
 777                                      struct security_descriptor *sd,
 778                                      struct dom_sid *sid,
 779                                      const struct GUID *oc_guid,
 780                                      bool userPassword)
 781 {
 782         int ret = LDB_SUCCESS;
 783         unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
 784         struct ldb_message_element *el;
 785         struct ldb_message *msg;
 786         const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
 787                                         "unicodePwd", "dBCSPwd", NULL }, **l;
 788         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 789
 790         msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
 791         if (msg == NULL) {
 792                 return ldb_module_oom(module);
 793         }
 794         for (l = passwordAttrs; *l != NULL; l++) {
 795                 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
 796                         continue;
 797                 }
 798
 799                 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
 800                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
 801                                 ++del_attr_cnt;
 802                         }
 803                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
 804                                 ++add_attr_cnt;
 805                         }
 806                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
 807                                 ++rep_attr_cnt;
 808                         }
 809                         ldb_msg_remove_element(msg, el);
 810                 }
 811         }
 812
 813         /* single deletes will be handled by the "password_hash" LDB module
 814          * later in the stack, so we let it though here */
 815         if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
 816                 talloc_free(tmp_ctx);
 817                 return LDB_SUCCESS;
 818         }
 819
 820         if (ldb_request_get_control(req,
 821                                     DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
 822                 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
 823                  * have a user password change and not a set as the message
 824                  * looks like. In it's value blob it contains the NT and/or LM
 825                  * hash of the old password specified by the user.
 826                  * This control is used by the SAMR and "kpasswd" password
 827                  * change mechanisms. */
 828                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 829                                                GUID_DRS_USER_CHANGE_PASSWORD,
 830                                                SEC_ADS_CONTROL_ACCESS,
 831                                                sid);
 832         }
 833         else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
 834                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 835                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
 836                                                SEC_ADS_CONTROL_ACCESS,
 837                                                sid);
 838         }
 839         else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
 840                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 841                                                GUID_DRS_USER_CHANGE_PASSWORD,
 842                                                SEC_ADS_CONTROL_ACCESS,
 843                                                sid);
 844                 /* Very strange, but we get constraint violation in this case */
 845                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 846                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
 847                 }
 848         }
 849         if (ret != LDB_SUCCESS) {
 850                 dsdb_acl_debug(sd, acl_user_token(module),
 851                                req->op.mod.message->dn,
 852                                true,
 853                                10);
 854         }
 855         talloc_free(tmp_ctx);
 856         return ret;
 857 }
 858
 859 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
 860 {
 861         int ret;
 862         struct ldb_context *ldb = ldb_module_get_ctx(module);
 863         const struct dsdb_schema *schema;
 864         unsigned int i;
 865         const struct GUID *guid;
 866         uint32_t access_granted;
 867         struct object_tree *root = NULL;
 868         struct object_tree *new_node = NULL;
 869         NTSTATUS status;
 870         struct ldb_result *acl_res;
 871         struct security_descriptor *sd;
 872         struct dom_sid *sid = NULL;
 873         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 874         bool userPassword = dsdb_user_password_support(module, req, req);
 875         TALLOC_CTX *tmp_ctx = talloc_new(req);
 876         static const char *acl_attrs[] = {
 877                 "nTSecurityDescriptor",
 878                 "objectClass",
 879                 "objectSid",
 880                 NULL
 881         };
 882
 883         if (as_system != NULL) {
 884                 as_system->critical = 0;
 885         }
 886
 887         /* Don't print this debug statement if elements[0].name is going to be NULL */
 888         if(req->op.mod.message->num_elements > 0)
 889         {
 890                 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
 891         }
 892         if (dsdb_module_am_system(module) || as_system) {
 893                 return ldb_next_request(module, req);
 894         }
 895         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 896                 return ldb_next_request(module, req);
 897         }
 898         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
 899                                     acl_attrs,
 900                                     DSDB_FLAG_NEXT_MODULE, req);
 901
 902         if (ret != LDB_SUCCESS) {
 903                 goto fail;
 904         }
 905
 906         schema = dsdb_get_schema(ldb, tmp_ctx);
 907         if (!schema) {
 908                 ret = LDB_ERR_OPERATIONS_ERROR;
 909                 goto fail;
 910         }
 911
 912         ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
 913         if (ret != LDB_SUCCESS) {
 914                 talloc_free(tmp_ctx);
 915                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 916                                  "acl_modify: Error retrieving security descriptor.");
 917         }
 918         /* Theoretically we pass the check if the object has no sd */
 919         if (!sd) {
 920                 goto success;
 921         }
 922
 923         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
 924         if (!guid) {
 925                 talloc_free(tmp_ctx);
 926                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 927                                  "acl_modify: Error retrieving object class GUID.");
 928         }
 929         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
 930         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
 931                                    &root, &new_node)) {
 932                 talloc_free(tmp_ctx);
 933                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 934                                  "acl_modify: Error adding new node in object tree.");
 935         }
 936         for (i=0; i < req->op.mod.message->num_elements; i++){
 937                 const struct dsdb_attribute *attr;
 938                 attr = dsdb_attribute_by_lDAPDisplayName(schema,
 939                                                          req->op.mod.message->elements[i].name);
 940
 941                 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
 942                         status = sec_access_check_ds(sd, acl_user_token(module),
 943                                              SEC_STD_WRITE_DAC,
 944                                              &access_granted,
 945                                              NULL,
 946                                              sid);
 947
 948                         if (!NT_STATUS_IS_OK(status)) {
 949                                 DEBUG(10, ("Object %s has no write dacl access\n",
 950                                            ldb_dn_get_linearized(req->op.mod.message->dn)));
 951                                 dsdb_acl_debug(sd,
 952                                                acl_user_token(module),
 953                                                req->op.mod.message->dn,
 954                                                true,
 955                                                10);
 956                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 957                                 goto fail;
 958                         }
 959                 }
 960                 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
 961                         ret = acl_check_self_membership(tmp_ctx,
 962                                                         module,
 963                                                         req,
 964                                                         sd,
 965                                                         sid,
 966                                                         guid,
 967                                                         attr);
 968                         if (ret != LDB_SUCCESS) {
 969                                 goto fail;
 970                         }
 971                 }
 972                 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
 973                         /* this one is not affected by any rights, we should let it through
 974                            so that passwords_hash returns the correct error */
 975                         continue;
 976                 }
 977                 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
 978                          (userPassword && ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0) ||
 979                          ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
 980                         ret = acl_check_password_rights(tmp_ctx,
 981                                                         module,
 982                                                         req,
 983                                                         sd,
 984                                                         sid,
 985                                                         guid,
 986                                                         userPassword);
 987                         if (ret != LDB_SUCCESS) {
 988                                 goto fail;
 989                         }
 990                 } else if (ldb_attr_cmp("servicePrincipalName", req->op.mod.message->elements[i].name) == 0) {
 991                         ret = acl_check_spn(tmp_ctx,
 992                                             module,
 993                                             req,
 994                                             sd,
 995                                             sid,
 996                                             guid,
 997                                             attr);
 998                         if (ret != LDB_SUCCESS) {
 999                                 goto fail;
1000                         }
1001                 } else {
1002
1003                 /* This basic attribute existence check with the right errorcode
1004                  * is needed since this module is the first one which requests
1005                  * schema attribute information.
1006                  * The complete attribute checking is done in the
1007                  * "objectclass_attrs" module behind this one.
1008                  */
1009                         if (!attr) {
1010                                 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
1011                                                        req->op.mod.message->elements[i].name,
1012                                                ldb_dn_get_linearized(req->op.mod.message->dn));
1013                                 ret =  LDB_ERR_NO_SUCH_ATTRIBUTE;
1014                                 goto fail;
1015                         }
1016                         if (!insert_in_object_tree(tmp_ctx,
1017                                                    &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
1018                                                    &new_node, &new_node)) {
1019                                 DEBUG(10, ("acl_modify: cannot add to object tree securityGUID\n"));
1020                                 ret = LDB_ERR_OPERATIONS_ERROR;
1021                                 goto fail;
1022                         }
1023
1024                         if (!insert_in_object_tree(tmp_ctx,
1025                                                    &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
1026                                 DEBUG(10, ("acl_modify: cannot add to object tree attributeGUID\n"));
1027                                 ret = LDB_ERR_OPERATIONS_ERROR;
1028                                 goto fail;
1029                         }
1030                 }
1031         }
1032
1033         if (root->num_of_children > 0) {
1034                 status = sec_access_check_ds(sd, acl_user_token(module),
1035                                              SEC_ADS_WRITE_PROP,
1036                                              &access_granted,
1037                                              root,
1038                                              sid);
1039
1040                 if (!NT_STATUS_IS_OK(status)) {
1041                         DEBUG(10, ("Object %s has no write property access\n",
1042                                    ldb_dn_get_linearized(req->op.mod.message->dn)));
1043                         dsdb_acl_debug(sd,
1044                                   acl_user_token(module),
1045                                   req->op.mod.message->dn,
1046                                   true,
1047                                   10);
1048                         ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1049                         goto fail;
1050                 }
1051         }
1052
1053 success:
1054         talloc_free(tmp_ctx);
1055         return ldb_next_request(module, req);
1056 fail:
1057         talloc_free(tmp_ctx);
1058         return ret;
1059 }
1060
1061 /* similar to the modify for the time being.
1062  * We need to consider the special delete tree case, though - TODO */
1063 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1064 {
1065         int ret;
1066         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
1067         struct ldb_context *ldb;
1068         struct ldb_dn *nc_root;
1069         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1070
1071         if (as_system != NULL) {
1072                 as_system->critical = 0;
1073         }
1074
1075         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1076         if (dsdb_module_am_system(module) || as_system) {
1077                 return ldb_next_request(module, req);
1078         }
1079         if (ldb_dn_is_special(req->op.del.dn)) {
1080                 return ldb_next_request(module, req);
1081         }
1082
1083         ldb = ldb_module_get_ctx(module);
1084
1085         /* Make sure we aren't deleting a NC */
1086
1087         ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1088         if (ret != LDB_SUCCESS) {
1089                 return ret;
1090         }
1091         if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1092                 talloc_free(nc_root);
1093                 DEBUG(10,("acl:deleting a NC\n"));
1094                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1095                 return ldb_module_done(req, NULL, NULL,
1096                                        LDB_ERR_UNWILLING_TO_PERFORM);
1097         }
1098         talloc_free(nc_root);
1099
1100         /* First check if we have delete object right */
1101         ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn,
1102                                              SEC_STD_DELETE, NULL, req);
1103         if (ret == LDB_SUCCESS) {
1104                 return ldb_next_request(module, req);
1105         }
1106
1107         /* Nope, we don't have delete object. Lets check if we have delete
1108          * child on the parent */
1109         ret = dsdb_module_check_access_on_dn(module, req, parent,
1110                                              SEC_ADS_DELETE_CHILD, NULL, req);
1111         if (ret != LDB_SUCCESS) {
1112                 return ret;
1113         }
1114
1115         return ldb_next_request(module, req);
1116 }
1117
1118 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1119 {
1120         int ret;
1121         struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
1122         struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
1123         const struct dsdb_schema *schema;
1124         struct ldb_context *ldb;
1125         struct security_descriptor *sd = NULL;
1126         struct dom_sid *sid = NULL;
1127         struct ldb_result *acl_res;
1128         const struct GUID *guid;
1129         struct ldb_dn *nc_root;
1130         struct object_tree *root = NULL;
1131         struct object_tree *new_node = NULL;
1132         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1133         TALLOC_CTX *tmp_ctx = talloc_new(req);
1134         NTSTATUS status;
1135         uint32_t access_granted;
1136         const char *rdn_name;
1137         static const char *acl_attrs[] = {
1138                 "nTSecurityDescriptor",
1139                 "objectClass",
1140                 "objectSid",
1141                 NULL
1142         };
1143
1144         if (as_system != NULL) {
1145                 as_system->critical = 0;
1146         }
1147
1148         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1149         if (dsdb_module_am_system(module) || as_system) {
1150                 return ldb_next_request(module, req);
1151         }
1152         if (ldb_dn_is_special(req->op.rename.olddn)) {
1153                 return ldb_next_request(module, req);
1154         }
1155
1156         ldb = ldb_module_get_ctx(module);
1157
1158         /* Make sure we aren't renaming/moving a NC */
1159
1160         ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1161         if (ret != LDB_SUCCESS) {
1162                 return ret;
1163         }
1164         if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1165                 talloc_free(nc_root);
1166                 DEBUG(10,("acl:renaming/moving a NC\n"));
1167                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1168                 return ldb_module_done(req, NULL, NULL,
1169                                        LDB_ERR_UNWILLING_TO_PERFORM);
1170         }
1171         talloc_free(nc_root);
1172
1173         /* Look for the parent */
1174
1175         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1176                                     req->op.rename.olddn, acl_attrs,
1177                                     DSDB_FLAG_NEXT_MODULE |
1178                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1179         /* we sould be able to find the parent */
1180         if (ret != LDB_SUCCESS) {
1181                 DEBUG(10,("acl: failed to find object %s\n",
1182                           ldb_dn_get_linearized(req->op.rename.olddn)));
1183                 talloc_free(tmp_ctx);
1184                 return ret;
1185         }
1186
1187         schema = dsdb_get_schema(ldb, acl_res);
1188         if (!schema) {
1189                 talloc_free(tmp_ctx);
1190                 return ldb_operr(ldb);
1191         }
1192
1193         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1194         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1195                                    &root, &new_node)) {
1196                 talloc_free(tmp_ctx);
1197                 return ldb_operr(ldb);
1198         };
1199
1200         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1201                                                           "name");
1202         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1203                                    &new_node, &new_node)) {
1204                 talloc_free(tmp_ctx);
1205                 return ldb_operr(ldb);
1206         };
1207
1208         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1209         if (rdn_name == NULL) {
1210                 talloc_free(tmp_ctx);
1211                 return ldb_operr(ldb);
1212         }
1213         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1214                                                           rdn_name);
1215         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1216                                    &new_node, &new_node)) {
1217                 talloc_free(tmp_ctx);
1218                 return ldb_operr(ldb);
1219         };
1220
1221         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1222
1223         if (ret != LDB_SUCCESS) {
1224                 talloc_free(tmp_ctx);
1225                 return ldb_operr(ldb);
1226         }
1227         /* Theoretically we pass the check if the object has no sd */
1228         if (!sd) {
1229                 talloc_free(tmp_ctx);
1230                 return LDB_SUCCESS;
1231         }
1232         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1233         status = sec_access_check_ds(sd, acl_user_token(module),
1234                                      SEC_ADS_WRITE_PROP,
1235                                      &access_granted,
1236                                      root,
1237                                      sid);
1238
1239         if (!NT_STATUS_IS_OK(status)) {
1240                 DEBUG(10, ("Object %s has no wp on name\n",
1241                            ldb_dn_get_linearized(req->op.rename.olddn)));
1242                 dsdb_acl_debug(sd,
1243                           acl_user_token(module),
1244                           req->op.rename.olddn,
1245                           true,
1246                           10);
1247                 talloc_free(tmp_ctx);
1248                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1249         }
1250
1251         if (ldb_dn_compare(oldparent, newparent) == 0) {
1252                 /* regular rename, not move, nothing more to do */
1253                 talloc_free(tmp_ctx);
1254                 return ldb_next_request(module, req);
1255         }
1256
1257         /* new parent should have create child */
1258         root = NULL;
1259         new_node = NULL;
1260         guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
1261         if (!guid) {
1262                 DEBUG(10,("acl:renamed object has no object class\n"));
1263                 talloc_free(tmp_ctx);
1264                 return ldb_module_done(req, NULL, NULL,  LDB_ERR_OPERATIONS_ERROR);
1265         }
1266
1267         ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid, req);
1268         if (ret != LDB_SUCCESS) {
1269                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1270                 talloc_free(tmp_ctx);
1271                 return ret;
1272         }
1273         /* do we have delete object on the object? */
1274
1275         status = sec_access_check_ds(sd, acl_user_token(module),
1276                                      SEC_STD_DELETE,
1277                                      &access_granted,
1278                                      NULL,
1279                                      sid);
1280
1281         if (NT_STATUS_IS_OK(status)) {
1282                 talloc_free(tmp_ctx);
1283                 return ldb_next_request(module, req);
1284         }
1285         /* what about delete child on the current parent */
1286         ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL, req);
1287         if (ret != LDB_SUCCESS) {
1288                 DEBUG(10,("acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn)));
1289                 talloc_free(tmp_ctx);
1290                 return ldb_module_done(req, NULL, NULL, ret);
1291         }
1292
1293         talloc_free(tmp_ctx);
1294
1295         return ldb_next_request(module, req);
1296 }
1297
1298 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1299 {
1300         struct ldb_context *ldb;
1301         struct acl_context *ac;
1302         struct acl_private *data;
1303         struct ldb_result *acl_res;
1304         static const char *acl_attrs[] = {
1305                 "objectClass",
1306                 "nTSecurityDescriptor",
1307                 "objectSid",
1308                 NULL
1309         };
1310         int ret;
1311         unsigned int i;
1312
1313         ac = talloc_get_type(req->context, struct acl_context);
1314         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1315         ldb = ldb_module_get_ctx(ac->module);
1316
1317         if (!ares) {
1318                 return ldb_module_done(ac->req, NULL, NULL,
1319                                        LDB_ERR_OPERATIONS_ERROR);
1320         }
1321         if (ares->error != LDB_SUCCESS) {
1322                 return ldb_module_done(ac->req, ares->controls,
1323                                        ares->response, ares->error);
1324         }
1325
1326         switch (ares->type) {
1327         case LDB_REPLY_ENTRY:
1328                 if (ac->allowedAttributes
1329                     || ac->allowedChildClasses
1330                     || ac->allowedChildClassesEffective
1331                     || ac->allowedAttributesEffective
1332                     || ac->sDRightsEffective) {
1333                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1334                                                     acl_attrs,
1335                                                     DSDB_FLAG_NEXT_MODULE, req);
1336                         if (ret != LDB_SUCCESS) {
1337                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1338                         }
1339                         if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1340                                 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1341                                 if (ret != LDB_SUCCESS) {
1342                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1343                                 }
1344                         }
1345                         if (ac->allowedChildClasses) {
1346                                 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1347                                                        ares->message, "allowedChildClasses");
1348                                 if (ret != LDB_SUCCESS) {
1349                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1350                                 }
1351                         }
1352                         if (ac->allowedChildClassesEffective) {
1353                                 ret = acl_childClassesEffective(ac->module, ac->schema,
1354                                                                 acl_res->msgs[0], ares->message, ac);
1355                                 if (ret != LDB_SUCCESS) {
1356                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1357                                 }
1358                         }
1359                         if (ac->sDRightsEffective) {
1360                                 ret = acl_sDRightsEffective(ac->module,
1361                                                             acl_res->msgs[0], ares->message, ac);
1362                                 if (ret != LDB_SUCCESS) {
1363                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1364                                 }
1365                         }
1366                 }
1367                 if (data && data->password_attrs) {
1368                         if (!ac->am_system) {
1369                                 for (i = 0; data->password_attrs[i]; i++) {
1370                                         if ((!ac->userPassword) &&
1371                                             (ldb_attr_cmp(data->password_attrs[i],
1372                                                           "userPassword") == 0))
1373                                                 continue;
1374
1375                                         ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1376                                 }
1377                         }
1378                 }
1379                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1380
1381         case LDB_REPLY_REFERRAL:
1382                 return ldb_module_send_referral(ac->req, ares->referral);
1383
1384         case LDB_REPLY_DONE:
1385                 return ldb_module_done(ac->req, ares->controls,
1386                                        ares->response, LDB_SUCCESS);
1387
1388         }
1389         return LDB_SUCCESS;
1390 }
1391
1392 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1393 {
1394         struct ldb_context *ldb;
1395         struct acl_context *ac;
1396         struct ldb_request *down_req;
1397         struct acl_private *data;
1398         int ret;
1399         unsigned int i;
1400
1401         ldb = ldb_module_get_ctx(module);
1402
1403         ac = talloc_zero(req, struct acl_context);
1404         if (ac == NULL) {
1405                 return ldb_oom(ldb);
1406         }
1407         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1408
1409         ac->module = module;
1410         ac->req = req;
1411         ac->am_system = dsdb_module_am_system(module);
1412         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1413         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1414         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1415         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1416         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1417         ac->userPassword = dsdb_user_password_support(module, ac, req);
1418         ac->schema = dsdb_get_schema(ldb, ac);
1419
1420         /* replace any attributes in the parse tree that are private,
1421            so we don't allow a search for 'userPassword=penguin',
1422            just as we would not allow that attribute to be returned */
1423         if (ac->am_system) {
1424                 /* FIXME: We should copy the tree and keep the original unmodified. */
1425                 /* remove password attributes */
1426                 if (data && data->password_attrs) {
1427                         for (i = 0; data->password_attrs[i]; i++) {
1428                                 if ((!ac->userPassword) &&
1429                                     (ldb_attr_cmp(data->password_attrs[i],
1430                                                   "userPassword") == 0))
1431                                                 continue;
1432
1433                                 ldb_parse_tree_attr_replace(req->op.search.tree,
1434                                                             data->password_attrs[i],
1435                                                             "kludgeACLredactedattribute");
1436                         }
1437                 }
1438         }
1439         ret = ldb_build_search_req_ex(&down_req,
1440                                       ldb, ac,
1441                                       req->op.search.base,
1442                                       req->op.search.scope,
1443                                       req->op.search.tree,
1444                                       req->op.search.attrs,
1445                                       req->controls,
1446                                       ac, acl_search_callback,
1447                                       req);
1448         LDB_REQ_SET_LOCATION(down_req);
1449         if (ret != LDB_SUCCESS) {
1450                 return ret;
1451         }
1452         /* perform the search */
1453         return ldb_next_request(module, down_req);
1454 }
1455
1456 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1457 {
1458         struct ldb_context *ldb = ldb_module_get_ctx(module);
1459         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1460
1461         /* allow everybody to read the sequence number */
1462         if (strcmp(req->op.extended.oid,
1463                    LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1464                 return ldb_next_request(module, req);
1465         }
1466
1467         if (dsdb_module_am_system(module) ||
1468             dsdb_module_am_administrator(module) || as_system) {
1469                 return ldb_next_request(module, req);
1470         } else {
1471                 ldb_asprintf_errstring(ldb,
1472                                        "acl_extended: "
1473                                        "attempted database modify not permitted. "
1474                                        "User %s is not SYSTEM or an administrator",
1475                                        acl_user_name(req, module));
1476                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1477         }
1478 }
1479
1480 static const struct ldb_module_ops ldb_acl_module_ops = {
1481         .name              = "acl",
1482         .search            = acl_search,
1483         .add               = acl_add,
1484         .modify            = acl_modify,
1485         .del               = acl_delete,
1486         .rename            = acl_rename,
1487         .extended          = acl_extended,
1488         .init_context      = acl_module_init
1489 };
1490
1491 int ldb_acl_module_init(const char *version)
1492 {
1493         LDB_MODULE_CHECK_VERSION(version);
1494         return ldb_register_module(&ldb_acl_module_ops);
1495 }