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 "lib/util/tsort.h"
  43 #include "system/kerberos.h"
  44 #include "auth/kerberos/kerberos.h"
  45
  46 struct extended_access_check_attribute {
  47         const char *oa_name;
  48         const uint32_t requires_rights;
  49 };
  50
  51 struct acl_private {
  52         bool acl_perform;
  53         const char **password_attrs;
  54 };
  55
  56 struct acl_context {
  57         struct ldb_module *module;
  58         struct ldb_request *req;
  59         bool am_system;
  60         bool allowedAttributes;
  61         bool allowedAttributesEffective;
  62         bool allowedChildClasses;
  63         bool allowedChildClassesEffective;
  64         bool sDRightsEffective;
  65         bool userPassword;
  66         const char * const *attrs;
  67         struct dsdb_schema *schema;
  68 };
  69
  70 static int acl_module_init(struct ldb_module *module)
  71 {
  72         struct ldb_context *ldb;
  73         struct acl_private *data;
  74         int ret;
  75         unsigned int i;
  76         TALLOC_CTX *mem_ctx;
  77         static const char *attrs[] = { "passwordAttribute", NULL };
  78         struct ldb_result *res;
  79         struct ldb_message *msg;
  80         struct ldb_message_element *password_attributes;
  81
  82         ldb = ldb_module_get_ctx(module);
  83
  84         ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
  85         if (ret != LDB_SUCCESS) {
  86                 ldb_debug(ldb, LDB_DEBUG_ERROR,
  87                           "acl_module_init: Unable to register control with rootdse!\n");
  88                 return ldb_operr(ldb);
  89         }
  90
  91         data = talloc(module, struct acl_private);
  92         if (data == NULL) {
  93                 return ldb_oom(ldb);
  94         }
  95
  96         data->password_attrs = NULL;
  97         data->acl_perform = lpcfg_parm_bool(ldb_get_opaque(ldb, "loadparm"),
  98                                          NULL, "acl", "perform", false);
  99         ldb_module_set_private(module, data);
 100
 101         mem_ctx = talloc_new(module);
 102         if (!mem_ctx) {
 103                 return ldb_oom(ldb);
 104         }
 105
 106         ret = dsdb_module_search_dn(module, mem_ctx, &res,
 107                                     ldb_dn_new(mem_ctx, ldb, "@KLUDGEACL"),
 108                                     attrs,
 109                                     DSDB_FLAG_NEXT_MODULE, NULL);
 110         if (ret != LDB_SUCCESS) {
 111                 goto done;
 112         }
 113         if (res->count == 0) {
 114                 goto done;
 115         }
 116
 117         if (res->count > 1) {
 118                 talloc_free(mem_ctx);
 119                 return LDB_ERR_CONSTRAINT_VIOLATION;
 120         }
 121
 122         msg = res->msgs[0];
 123
 124         password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
 125         if (!password_attributes) {
 126                 goto done;
 127         }
 128         data->password_attrs = talloc_array(data, const char *, password_attributes->num_values + 1);
 129         if (!data->password_attrs) {
 130                 talloc_free(mem_ctx);
 131                 return ldb_oom(ldb);
 132         }
 133         for (i=0; i < password_attributes->num_values; i++) {
 134                 data->password_attrs[i] = (const char *)password_attributes->values[i].data;
 135                 talloc_steal(data->password_attrs, password_attributes->values[i].data);
 136         }
 137         data->password_attrs[i] = NULL;
 138
 139 done:
 140         talloc_free(mem_ctx);
 141         return ldb_next_init(module);
 142 }
 143
 144 static int acl_allowedAttributes(struct ldb_module *module,
 145                                  const struct dsdb_schema *schema,
 146                                  struct ldb_message *sd_msg,
 147                                  struct ldb_message *msg,
 148                                  struct acl_context *ac)
 149 {
 150         struct ldb_message_element *oc_el;
 151         struct ldb_context *ldb = ldb_module_get_ctx(module);
 152         TALLOC_CTX *mem_ctx;
 153         const char **attr_list;
 154         int i, ret;
 155
 156         /* If we don't have a schema yet, we can't do anything... */
 157         if (schema == NULL) {
 158                 ldb_asprintf_errstring(ldb, "cannot add allowedAttributes to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 159                 return LDB_ERR_OPERATIONS_ERROR;
 160         }
 161
 162         /* Must remove any existing attribute */
 163         if (ac->allowedAttributes) {
 164                 ldb_msg_remove_attr(msg, "allowedAttributes");
 165         }
 166
 167         mem_ctx = talloc_new(msg);
 168         if (!mem_ctx) {
 169                 return ldb_oom(ldb);
 170         }
 171
 172         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 173         attr_list = dsdb_full_attribute_list(mem_ctx, schema, oc_el, DSDB_SCHEMA_ALL);
 174         if (!attr_list) {
 175                 ldb_asprintf_errstring(ldb, "acl: Failed to get list of attributes");
 176                 talloc_free(mem_ctx);
 177                 return LDB_ERR_OPERATIONS_ERROR;
 178         }
 179         if (ac->allowedAttributes) {
 180                 for (i=0; attr_list && attr_list[i]; i++) {
 181                         ldb_msg_add_string(msg, "allowedAttributes", attr_list[i]);
 182                 }
 183         }
 184         if (ac->allowedAttributesEffective) {
 185                 struct security_descriptor *sd;
 186                 struct dom_sid *sid = NULL;
 187                 struct ldb_control *as_system = ldb_request_get_control(ac->req,
 188                                                                         LDB_CONTROL_AS_SYSTEM_OID);
 189
 190                 if (as_system != NULL) {
 191                         as_system->critical = 0;
 192                 }
 193
 194                 ldb_msg_remove_attr(msg, "allowedAttributesEffective");
 195                 if (ac->am_system || as_system) {
 196                         for (i=0; attr_list && attr_list[i]; i++) {
 197                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 198                         }
 199                         return LDB_SUCCESS;
 200                 }
 201
 202                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), mem_ctx, sd_msg, &sd);
 203
 204                 if (ret != LDB_SUCCESS) {
 205                         return ret;
 206                 }
 207
 208                 sid = samdb_result_dom_sid(mem_ctx, sd_msg, "objectSid");
 209                 for (i=0; attr_list && attr_list[i]; i++) {
 210                         const struct dsdb_attribute *attr = dsdb_attribute_by_lDAPDisplayName(schema,
 211                                                                                         attr_list[i]);
 212                         if (!attr) {
 213                                 return ldb_operr(ldb);
 214                         }
 215                         /* remove constructed attributes */
 216                         if (attr->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED
 217                             || attr->systemOnly
 218                             || (attr->linkID != 0 && attr->linkID % 2 != 0 )) {
 219                                 continue;
 220                         }
 221                         ret = acl_check_access_on_attribute(module,
 222                                                             msg,
 223                                                             sd,
 224                                                             sid,
 225                                                             SEC_ADS_WRITE_PROP,
 226                                                             attr);
 227                         if (ret == LDB_SUCCESS) {
 228                                 ldb_msg_add_string(msg, "allowedAttributesEffective", attr_list[i]);
 229                         }
 230                 }
 231         }
 232         return LDB_SUCCESS;
 233 }
 234
 235 static int acl_childClasses(struct ldb_module *module,
 236                             const struct dsdb_schema *schema,
 237                             struct ldb_message *sd_msg,
 238                             struct ldb_message *msg,
 239                             const char *attrName)
 240 {
 241         struct ldb_message_element *oc_el;
 242         struct ldb_message_element *allowedClasses;
 243         const struct dsdb_class *sclass;
 244         unsigned int i, j;
 245         int ret;
 246
 247         /* If we don't have a schema yet, we can't do anything... */
 248         if (schema == NULL) {
 249                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add childClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 250                 return LDB_ERR_OPERATIONS_ERROR;
 251         }
 252
 253         /* Must remove any existing attribute, or else confusion reins */
 254         ldb_msg_remove_attr(msg, attrName);
 255         ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
 256         if (ret != LDB_SUCCESS) {
 257                 return ret;
 258         }
 259
 260         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 261
 262         for (i=0; oc_el && i < oc_el->num_values; i++) {
 263                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 264                 if (!sclass) {
 265                         /* We don't know this class?  what is going on? */
 266                         continue;
 267                 }
 268
 269                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 270                         ldb_msg_add_string(msg, attrName, sclass->possibleInferiors[j]);
 271                 }
 272         }
 273         if (allowedClasses->num_values > 1) {
 274                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 275                 for (i=1 ; i < allowedClasses->num_values; i++) {
 276                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 277                         struct ldb_val *val2 = &allowedClasses->values[i];
 278                         if (data_blob_cmp(val1, val2) == 0) {
 279                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof(struct ldb_val));
 280                                 allowedClasses->num_values--;
 281                                 i--;
 282                         }
 283                 }
 284         }
 285
 286         return LDB_SUCCESS;
 287 }
 288
 289 static int acl_check_access_on_class(struct ldb_module *module,
 290                                      const struct dsdb_schema *schema,
 291                                      TALLOC_CTX *mem_ctx,
 292                                      struct security_descriptor *sd,
 293                                      struct security_token *token,
 294                                      struct dom_sid *rp_sid,
 295                                      uint32_t access_mask,
 296                                      const char *class_name)
 297 {
 298         int ret;
 299         NTSTATUS status;
 300         uint32_t access_granted;
 301         struct object_tree *root = NULL;
 302         struct object_tree *new_node = NULL;
 303         const struct GUID *guid;
 304
 305         if (class_name != NULL) {
 306                 guid = class_schemaid_guid_by_lDAPDisplayName(schema, class_name);
 307                 if (!guid) {
 308                         DEBUG(10, ("acl_search: cannot find class %s\n",
 309                                    class_name));
 310                         goto fail;
 311                 }
 312                 if (!insert_in_object_tree(mem_ctx,
 313                                            guid, access_mask,
 314                                            &root, &new_node)) {
 315                         DEBUG(10, ("acl_search: cannot add to object tree guid\n"));
 316                         goto fail;
 317                 }
 318         }
 319
 320         status = sec_access_check_ds(sd, token,
 321                                      access_mask,
 322                                      &access_granted,
 323                                      root,
 324                                      rp_sid);
 325         if (!NT_STATUS_IS_OK(status)) {
 326                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 327         } else {
 328                 ret = LDB_SUCCESS;
 329         }
 330         return ret;
 331 fail:
 332         return ldb_operr(ldb_module_get_ctx(module));
 333 }
 334
 335 static int acl_childClassesEffective(struct ldb_module *module,
 336                                      const struct dsdb_schema *schema,
 337                                      struct ldb_message *sd_msg,
 338                                      struct ldb_message *msg,
 339                                      struct acl_context *ac)
 340 {
 341         struct ldb_message_element *oc_el;
 342         struct ldb_message_element *allowedClasses = NULL;
 343         const struct dsdb_class *sclass;
 344         struct security_descriptor *sd;
 345         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 346                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 347         struct dom_sid *sid = NULL;
 348         unsigned int i, j;
 349         int ret;
 350
 351         if (as_system != NULL) {
 352                 as_system->critical = 0;
 353         }
 354
 355         if (ac->am_system || as_system) {
 356                 return acl_childClasses(module, schema, sd_msg, msg, "allowedChildClassesEffective");
 357         }
 358
 359         /* If we don't have a schema yet, we can't do anything... */
 360         if (schema == NULL) {
 361                 ldb_asprintf_errstring(ldb_module_get_ctx(module), "cannot add allowedChildClassesEffective to %s because no schema is loaded", ldb_dn_get_linearized(msg->dn));
 362                 return LDB_ERR_OPERATIONS_ERROR;
 363         }
 364
 365         /* Must remove any existing attribute, or else confusion reins */
 366         ldb_msg_remove_attr(msg, "allowedChildClassesEffective");
 367
 368         oc_el = ldb_msg_find_element(sd_msg, "objectClass");
 369         ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 370         if (ret != LDB_SUCCESS) {
 371                 return ret;
 372         }
 373
 374         sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 375         for (i=0; oc_el && i < oc_el->num_values; i++) {
 376                 sclass = dsdb_class_by_lDAPDisplayName_ldb_val(schema, &oc_el->values[i]);
 377                 if (!sclass) {
 378                         /* We don't know this class?  what is going on? */
 379                         continue;
 380                 }
 381
 382                 for (j=0; sclass->possibleInferiors && sclass->possibleInferiors[j]; j++) {
 383                         ret = acl_check_access_on_class(module,
 384                                                         schema,
 385                                                         msg,
 386                                                         sd,
 387                                                         acl_user_token(module),
 388                                                         sid,
 389                                                         SEC_ADS_CREATE_CHILD,
 390                                                         sclass->possibleInferiors[j]);
 391                         if (ret == LDB_SUCCESS) {
 392                                 ldb_msg_add_string(msg, "allowedChildClassesEffective",
 393                                                    sclass->possibleInferiors[j]);
 394                         }
 395                 }
 396         }
 397         allowedClasses = ldb_msg_find_element(msg, "allowedChildClassesEffective");
 398         if (!allowedClasses) {
 399                 return LDB_SUCCESS;
 400         }
 401
 402         if (allowedClasses->num_values > 1) {
 403                 TYPESAFE_QSORT(allowedClasses->values, allowedClasses->num_values, data_blob_cmp);
 404                 for (i=1 ; i < allowedClasses->num_values; i++) {
 405                         struct ldb_val *val1 = &allowedClasses->values[i-1];
 406                         struct ldb_val *val2 = &allowedClasses->values[i];
 407                         if (data_blob_cmp(val1, val2) == 0) {
 408                                 memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
 409                                 allowedClasses->num_values--;
 410                                 i--;
 411                         }
 412                 }
 413         }
 414         return LDB_SUCCESS;
 415 }
 416
 417 static int acl_sDRightsEffective(struct ldb_module *module,
 418                                  struct ldb_message *sd_msg,
 419                                  struct ldb_message *msg,
 420                                  struct acl_context *ac)
 421 {
 422         struct ldb_message_element *rightsEffective;
 423         int ret;
 424         struct security_descriptor *sd;
 425         struct ldb_control *as_system = ldb_request_get_control(ac->req,
 426                                                                 LDB_CONTROL_AS_SYSTEM_OID);
 427         struct dom_sid *sid = NULL;
 428         uint32_t flags = 0;
 429
 430         if (as_system != NULL) {
 431                 as_system->critical = 0;
 432         }
 433
 434         /* Must remove any existing attribute, or else confusion reins */
 435         ldb_msg_remove_attr(msg, "sDRightsEffective");
 436         ret = ldb_msg_add_empty(msg, "sDRightsEffective", 0, &rightsEffective);
 437         if (ret != LDB_SUCCESS) {
 438                 return ret;
 439         }
 440         if (ac->am_system || as_system) {
 441                 flags = SECINFO_OWNER | SECINFO_GROUP |  SECINFO_SACL |  SECINFO_DACL;
 442         }
 443         else {
 444                 /* Get the security descriptor from the message */
 445                 ret = dsdb_get_sd_from_ldb_message(ldb_module_get_ctx(module), msg, sd_msg, &sd);
 446                 if (ret != LDB_SUCCESS) {
 447                         return ret;
 448                 }
 449                 sid = samdb_result_dom_sid(msg, sd_msg, "objectSid");
 450                 ret = acl_check_access_on_attribute(module,
 451                                                     msg,
 452                                                     sd,
 453                                                     sid,
 454                                                     SEC_STD_WRITE_OWNER,
 455                                                     NULL);
 456                 if (ret == LDB_SUCCESS) {
 457                         flags |= SECINFO_OWNER | SECINFO_GROUP;
 458                 }
 459                 ret = acl_check_access_on_attribute(module,
 460                                                     msg,
 461                                                     sd,
 462                                                     sid,
 463                                                     SEC_STD_WRITE_DAC,
 464                                                     NULL);
 465                 if (ret == LDB_SUCCESS) {
 466                         flags |= SECINFO_DACL;
 467                 }
 468                 ret = acl_check_access_on_attribute(module,
 469                                                     msg,
 470                                                     sd,
 471                                                     sid,
 472                                                     SEC_FLAG_SYSTEM_SECURITY,
 473                                                     NULL);
 474                 if (ret == LDB_SUCCESS) {
 475                         flags |= SECINFO_SACL;
 476                 }
 477         }
 478         return samdb_msg_add_uint(ldb_module_get_ctx(module), msg, msg,
 479                                   "sDRightsEffective", flags);
 480 }
 481
 482 static int acl_validate_spn_value(TALLOC_CTX *mem_ctx,
 483                                   struct ldb_context *ldb,
 484                                   const char *spn_value,
 485                                   uint32_t userAccountControl,
 486                                   const char *samAccountName,
 487                                   const char *dnsHostName,
 488                                   const char *netbios_name,
 489                                   const char *ntds_guid)
 490 {
 491         int ret;
 492         krb5_context krb_ctx;
 493         krb5_error_code kerr;
 494         krb5_principal principal;
 495         char *instanceName;
 496         char *serviceType;
 497         char *serviceName;
 498         const char *forest_name = samdb_forest_name(ldb, mem_ctx);
 499         const char *base_domain = samdb_default_domain_name(ldb, mem_ctx);
 500         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
 501                                                           struct loadparm_context);
 502         bool is_dc = (userAccountControl & UF_SERVER_TRUST_ACCOUNT) ||
 503                 (userAccountControl & UF_PARTIAL_SECRETS_ACCOUNT);
 504
 505         if (strcasecmp_m(spn_value, samAccountName) == 0) {
 506                 /* MacOS X sets this value, and setting an SPN of your
 507                  * own samAccountName is both pointless and safe */
 508                 return LDB_SUCCESS;
 509         }
 510
 511         kerr = smb_krb5_init_context_basic(mem_ctx,
 512                                            lp_ctx,
 513                                            &krb_ctx);
 514         if (kerr != 0) {
 515                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 516                                  "Could not initialize kerberos context.");
 517         }
 518
 519         ret = krb5_parse_name(krb_ctx, spn_value, &principal);
 520         if (ret) {
 521                 krb5_free_context(krb_ctx);
 522                 return LDB_ERR_CONSTRAINT_VIOLATION;
 523         }
 524
 525         if (principal->name.name_string.len < 2) {
 526                 goto fail;
 527         }
 528
 529         instanceName = principal->name.name_string.val[1];
 530         serviceType = principal->name.name_string.val[0];
 531         if (principal->name.name_string.len == 3) {
 532                 serviceName = principal->name.name_string.val[2];
 533         } else {
 534                 serviceName = NULL;
 535         }
 536
 537         if (serviceName) {
 538                 if (!is_dc) {
 539                         goto fail;
 540                 }
 541                 if (strcasecmp(serviceType, "ldap") == 0) {
 542                         if (strcasecmp(serviceName, netbios_name) != 0 &&
 543                             strcasecmp(serviceName, forest_name) != 0) {
 544                                 goto fail;
 545                         }
 546
 547                 } else if (strcasecmp(serviceType, "gc") == 0) {
 548                         if (strcasecmp(serviceName, forest_name) != 0) {
 549                                 goto fail;
 550                         }
 551                 } else {
 552                         if (strcasecmp(serviceName, base_domain) != 0 &&
 553                             strcasecmp(serviceName, netbios_name) != 0) {
 554                                 goto fail;
 555                         }
 556                 }
 557         }
 558         /* instanceName can be samAccountName without $ or dnsHostName
 559          * or "ntds_guid._msdcs.forest_domain for DC objects */
 560         if (strlen(instanceName) == (strlen(samAccountName) - 1)
 561             && strncasecmp(instanceName, samAccountName, strlen(samAccountName) - 1) == 0) {
 562                 goto success;
 563         } else if (dnsHostName != NULL && strcasecmp(instanceName, dnsHostName) == 0) {
 564                 goto success;
 565         } else if (is_dc) {
 566                 const char *guid_str;
 567                 guid_str = talloc_asprintf(mem_ctx,"%s._msdcs.%s",
 568                                            ntds_guid,
 569                                            forest_name);
 570                 if (strcasecmp(instanceName, guid_str) == 0) {
 571                         goto success;
 572                 }
 573         }
 574
 575 fail:
 576         krb5_free_principal(krb_ctx, principal);
 577         krb5_free_context(krb_ctx);
 578         return LDB_ERR_CONSTRAINT_VIOLATION;
 579
 580 success:
 581         krb5_free_principal(krb_ctx, principal);
 582         krb5_free_context(krb_ctx);
 583         return LDB_SUCCESS;
 584 }
 585
 586 static int acl_check_spn(TALLOC_CTX *mem_ctx,
 587                          struct ldb_module *module,
 588                          struct ldb_request *req,
 589                          struct security_descriptor *sd,
 590                          struct dom_sid *sid,
 591                          const struct GUID *oc_guid,
 592                          const struct dsdb_attribute *attr)
 593 {
 594         int ret;
 595         unsigned int i;
 596         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 597         struct ldb_context *ldb = ldb_module_get_ctx(module);
 598         struct ldb_result *acl_res;
 599         struct ldb_result *netbios_res;
 600         struct ldb_message_element *el;
 601         struct ldb_dn *partitions_dn = samdb_partitions_dn(ldb, tmp_ctx);
 602         uint32_t userAccountControl;
 603         const char *samAccountName;
 604         const char *dnsHostName;
 605         const char *netbios_name;
 606         struct GUID ntds;
 607         char *ntds_guid = NULL;
 608
 609         static const char *acl_attrs[] = {
 610                 "samAccountName",
 611                 "dnsHostName",
 612                 "userAccountControl",
 613                 NULL
 614         };
 615         static const char *netbios_attrs[] = {
 616                 "nETBIOSName",
 617                 NULL
 618         };
 619
 620         /* if we have wp, we can do whatever we like */
 621         if (acl_check_access_on_attribute(module,
 622                                           tmp_ctx,
 623                                           sd,
 624                                           sid,
 625                                           SEC_ADS_WRITE_PROP,
 626                                           attr) == LDB_SUCCESS) {
 627                 talloc_free(tmp_ctx);
 628                 return LDB_SUCCESS;
 629         }
 630
 631         ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 632                                        GUID_DRS_VALIDATE_SPN,
 633                                        SEC_ADS_SELF_WRITE,
 634                                        sid);
 635
 636         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 637                 dsdb_acl_debug(sd, acl_user_token(module),
 638                                req->op.mod.message->dn,
 639                                true,
 640                                10);
 641                 talloc_free(tmp_ctx);
 642                 return ret;
 643         }
 644
 645         ret = dsdb_module_search_dn(module, tmp_ctx,
 646                                     &acl_res, req->op.mod.message->dn,
 647                                     acl_attrs,
 648                                     DSDB_FLAG_NEXT_MODULE |
 649                                     DSDB_SEARCH_SHOW_DELETED, req);
 650         if (ret != LDB_SUCCESS) {
 651                 talloc_free(tmp_ctx);
 652                 return ret;
 653         }
 654
 655         userAccountControl = ldb_msg_find_attr_as_uint(acl_res->msgs[0], "userAccountControl", 0);
 656         dnsHostName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "dnsHostName", NULL);
 657         samAccountName = ldb_msg_find_attr_as_string(acl_res->msgs[0], "samAccountName", NULL);
 658
 659         ret = dsdb_module_search(module, tmp_ctx,
 660                                  &netbios_res, partitions_dn,
 661                                  LDB_SCOPE_ONELEVEL,
 662                                  netbios_attrs,
 663                                  DSDB_FLAG_NEXT_MODULE,
 664                                  req,
 665                                  "(ncName=%s)",
 666                                  ldb_dn_get_linearized(ldb_get_default_basedn(ldb)));
 667
 668         netbios_name = ldb_msg_find_attr_as_string(netbios_res->msgs[0], "nETBIOSName", NULL);
 669
 670         el = ldb_msg_find_element(req->op.mod.message, "servicePrincipalName");
 671         if (!el) {
 672                 talloc_free(tmp_ctx);
 673                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 674                                          "Error finding element for servicePrincipalName.");
 675         }
 676
 677         /* NTDSDSA objectGuid of object we are checking SPN for */
 678         if (userAccountControl & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) {
 679                 ret = dsdb_module_find_ntdsguid_for_computer(module, tmp_ctx,
 680                                                              req->op.mod.message->dn, &ntds, req);
 681                 if (ret != LDB_SUCCESS) {
 682                         ldb_asprintf_errstring(ldb, "Failed to find NTDSDSA objectGuid for %s: %s",
 683                                                ldb_dn_get_linearized(req->op.mod.message->dn),
 684                                                ldb_strerror(ret));
 685                         talloc_free(tmp_ctx);
 686                         return LDB_ERR_OPERATIONS_ERROR;
 687                 }
 688                 ntds_guid = GUID_string(tmp_ctx, &ntds);
 689         }
 690
 691         for (i=0; i < el->num_values; i++) {
 692                 ret = acl_validate_spn_value(tmp_ctx,
 693                                              ldb,
 694                                              (char *)el->values[i].data,
 695                                              userAccountControl,
 696                                              samAccountName,
 697                                              dnsHostName,
 698                                              netbios_name,
 699                                              ntds_guid);
 700                 if (ret != LDB_SUCCESS) {
 701                         talloc_free(tmp_ctx);
 702                         return ret;
 703                 }
 704         }
 705         talloc_free(tmp_ctx);
 706         return LDB_SUCCESS;
 707 }
 708
 709 static int acl_add(struct ldb_module *module, struct ldb_request *req)
 710 {
 711         int ret;
 712         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.add.message->dn);
 713         struct ldb_context *ldb;
 714         const struct dsdb_schema *schema;
 715         struct ldb_message_element *oc_el;
 716         const struct GUID *guid;
 717         struct ldb_dn *nc_root;
 718         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 719
 720         if (as_system != NULL) {
 721                 as_system->critical = 0;
 722         }
 723
 724         if (dsdb_module_am_system(module) || as_system) {
 725                 return ldb_next_request(module, req);
 726         }
 727         if (ldb_dn_is_special(req->op.add.message->dn)) {
 728                 return ldb_next_request(module, req);
 729         }
 730
 731         ldb = ldb_module_get_ctx(module);
 732
 733         /* Creating an NC. There is probably something we should do here,
 734          * but we will establish that later */
 735
 736         ret = dsdb_find_nc_root(ldb, req, req->op.add.message->dn, &nc_root);
 737         if (ret != LDB_SUCCESS) {
 738                 return ret;
 739         }
 740         if (ldb_dn_compare(nc_root, req->op.add.message->dn) == 0) {
 741                 talloc_free(nc_root);
 742                 return ldb_next_request(module, req);
 743         }
 744         talloc_free(nc_root);
 745
 746         schema = dsdb_get_schema(ldb, req);
 747         if (!schema) {
 748                 return ldb_operr(ldb);
 749         }
 750
 751         oc_el = ldb_msg_find_element(req->op.add.message, "objectClass");
 752         if (!oc_el || oc_el->num_values == 0) {
 753                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
 754                                        "acl: unable to find objectClass on %s\n",
 755                                        ldb_dn_get_linearized(req->op.add.message->dn));
 756                 return ldb_module_done(req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
 757         }
 758
 759         guid = class_schemaid_guid_by_lDAPDisplayName(schema,
 760                                                       (char *)oc_el->values[oc_el->num_values-1].data);
 761         ret = dsdb_module_check_access_on_dn(module, req, parent, SEC_ADS_CREATE_CHILD, guid, req);
 762         if (ret != LDB_SUCCESS) {
 763                 return ret;
 764         }
 765         return ldb_next_request(module, req);
 766 }
 767
 768 /* ckecks if modifications are allowed on "Member" attribute */
 769 static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
 770                                      struct ldb_module *module,
 771                                      struct ldb_request *req,
 772                                      struct security_descriptor *sd,
 773                                      struct dom_sid *sid,
 774                                      const struct GUID *oc_guid,
 775                                      const struct dsdb_attribute *attr)
 776 {
 777         int ret;
 778         unsigned int i;
 779         struct ldb_context *ldb = ldb_module_get_ctx(module);
 780         struct ldb_dn *user_dn;
 781         struct ldb_message_element *member_el;
 782         /* if we have wp, we can do whatever we like */
 783         if (acl_check_access_on_attribute(module,
 784                                           mem_ctx,
 785                                           sd,
 786                                           sid,
 787                                           SEC_ADS_WRITE_PROP,
 788                                           attr) == LDB_SUCCESS) {
 789                 return LDB_SUCCESS;
 790         }
 791         /* if we are adding/deleting ourselves, check for self membership */
 792         ret = dsdb_find_dn_by_sid(ldb, mem_ctx,
 793                                   &acl_user_token(module)->sids[PRIMARY_USER_SID_INDEX],
 794                                   &user_dn);
 795         if (ret != LDB_SUCCESS) {
 796                 return ret;
 797         }
 798         member_el = ldb_msg_find_element(req->op.mod.message, "member");
 799         if (!member_el) {
 800                 return ldb_operr(ldb);
 801         }
 802         /* user can only remove oneself */
 803         if (member_el->num_values == 0) {
 804                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 805         }
 806         for (i = 0; i < member_el->num_values; i++) {
 807                 if (strcasecmp((const char *)member_el->values[i].data,
 808                                ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
 809                         return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
 810                 }
 811         }
 812         ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
 813                                        GUID_DRS_SELF_MEMBERSHIP,
 814                                        SEC_ADS_SELF_WRITE,
 815                                        sid);
 816         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 817                 dsdb_acl_debug(sd, acl_user_token(module),
 818                                req->op.mod.message->dn,
 819                                true,
 820                                10);
 821         }
 822         return ret;
 823 }
 824
 825 static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
 826                                      struct ldb_module *module,
 827                                      struct ldb_request *req,
 828                                      struct security_descriptor *sd,
 829                                      struct dom_sid *sid,
 830                                      const struct GUID *oc_guid,
 831                                      bool userPassword)
 832 {
 833         int ret = LDB_SUCCESS;
 834         unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
 835         struct ldb_message_element *el;
 836         struct ldb_message *msg;
 837         const char *passwordAttrs[] = { "userPassword", "clearTextPassword",
 838                                         "unicodePwd", "dBCSPwd", NULL }, **l;
 839         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 840
 841         msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
 842         if (msg == NULL) {
 843                 return ldb_module_oom(module);
 844         }
 845         for (l = passwordAttrs; *l != NULL; l++) {
 846                 if ((!userPassword) && (ldb_attr_cmp(*l, "userPassword") == 0)) {
 847                         continue;
 848                 }
 849
 850                 while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
 851                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) {
 852                                 ++del_attr_cnt;
 853                         }
 854                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) {
 855                                 ++add_attr_cnt;
 856                         }
 857                         if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_REPLACE) {
 858                                 ++rep_attr_cnt;
 859                         }
 860                         ldb_msg_remove_element(msg, el);
 861                 }
 862         }
 863
 864         /* single deletes will be handled by the "password_hash" LDB module
 865          * later in the stack, so we let it though here */
 866         if ((del_attr_cnt > 0) && (add_attr_cnt == 0) && (rep_attr_cnt == 0)) {
 867                 talloc_free(tmp_ctx);
 868                 return LDB_SUCCESS;
 869         }
 870
 871         if (ldb_request_get_control(req,
 872                                     DSDB_CONTROL_PASSWORD_CHANGE_OID) != NULL) {
 873                 /* The "DSDB_CONTROL_PASSWORD_CHANGE_OID" control means that we
 874                  * have a user password change and not a set as the message
 875                  * looks like. In it's value blob it contains the NT and/or LM
 876                  * hash of the old password specified by the user.
 877                  * This control is used by the SAMR and "kpasswd" password
 878                  * change mechanisms. */
 879                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 880                                                GUID_DRS_USER_CHANGE_PASSWORD,
 881                                                SEC_ADS_CONTROL_ACCESS,
 882                                                sid);
 883         }
 884         else if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
 885                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 886                                                GUID_DRS_FORCE_CHANGE_PASSWORD,
 887                                                SEC_ADS_CONTROL_ACCESS,
 888                                                sid);
 889         }
 890         else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
 891                 ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
 892                                                GUID_DRS_USER_CHANGE_PASSWORD,
 893                                                SEC_ADS_CONTROL_ACCESS,
 894                                                sid);
 895                 /* Very strange, but we get constraint violation in this case */
 896                 if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 897                         ret = LDB_ERR_CONSTRAINT_VIOLATION;
 898                 }
 899         }
 900         if (ret != LDB_SUCCESS) {
 901                 dsdb_acl_debug(sd, acl_user_token(module),
 902                                req->op.mod.message->dn,
 903                                true,
 904                                10);
 905         }
 906         talloc_free(tmp_ctx);
 907         return ret;
 908 }
 909
 910 static const struct GUID *get_oc_guid_from_message(const struct dsdb_schema *schema,
 911                                                    struct ldb_message *msg)
 912 {
 913         struct ldb_message_element *oc_el;
 914         const struct dsdb_class *object_class;
 915
 916         oc_el = ldb_msg_find_element(msg, "objectClass");
 917         if (!oc_el) {
 918                 return NULL;
 919         }
 920
 921         object_class = dsdb_get_last_structural_class(schema, oc_el);
 922         if (object_class == NULL) {
 923                 return NULL;
 924         }
 925
 926         return &object_class->schemaIDGUID;
 927 }
 928
 929
 930 static int acl_modify(struct ldb_module *module, struct ldb_request *req)
 931 {
 932         int ret;
 933         struct ldb_context *ldb = ldb_module_get_ctx(module);
 934         const struct dsdb_schema *schema;
 935         unsigned int i;
 936         const struct GUID *guid;
 937         uint32_t access_granted;
 938         struct object_tree *root = NULL;
 939         struct object_tree *new_node = NULL;
 940         NTSTATUS status;
 941         struct ldb_result *acl_res;
 942         struct security_descriptor *sd;
 943         struct dom_sid *sid = NULL;
 944         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
 945         bool userPassword = dsdb_user_password_support(module, req, req);
 946         TALLOC_CTX *tmp_ctx = talloc_new(req);
 947         static const char *acl_attrs[] = {
 948                 "nTSecurityDescriptor",
 949                 "objectClass",
 950                 "objectSid",
 951                 NULL
 952         };
 953
 954         if (as_system != NULL) {
 955                 as_system->critical = 0;
 956         }
 957
 958         /* Don't print this debug statement if elements[0].name is going to be NULL */
 959         if(req->op.mod.message->num_elements > 0)
 960         {
 961                 DEBUG(10, ("ldb:acl_modify: %s\n", req->op.mod.message->elements[0].name));
 962         }
 963         if (dsdb_module_am_system(module) || as_system) {
 964                 return ldb_next_request(module, req);
 965         }
 966         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 967                 return ldb_next_request(module, req);
 968         }
 969         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
 970                                     acl_attrs,
 971                                     DSDB_FLAG_NEXT_MODULE | DSDB_SEARCH_SHOW_DELETED,
 972                                     req);
 973
 974         if (ret != LDB_SUCCESS) {
 975                 goto fail;
 976         }
 977
 978         schema = dsdb_get_schema(ldb, tmp_ctx);
 979         if (!schema) {
 980                 ret = LDB_ERR_OPERATIONS_ERROR;
 981                 goto fail;
 982         }
 983
 984         ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, acl_res->msgs[0], &sd);
 985         if (ret != LDB_SUCCESS) {
 986                 talloc_free(tmp_ctx);
 987                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 988                                  "acl_modify: Error retrieving security descriptor.");
 989         }
 990         /* Theoretically we pass the check if the object has no sd */
 991         if (!sd) {
 992                 goto success;
 993         }
 994
 995         guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
 996         if (!guid) {
 997                 talloc_free(tmp_ctx);
 998                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
 999                                  "acl_modify: Error retrieving object class GUID.");
1000         }
1001         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1002         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1003                                    &root, &new_node)) {
1004                 talloc_free(tmp_ctx);
1005                 return ldb_error(ldb, LDB_ERR_OPERATIONS_ERROR,
1006                                  "acl_modify: Error adding new node in object tree.");
1007         }
1008         for (i=0; i < req->op.mod.message->num_elements; i++){
1009                 const struct dsdb_attribute *attr;
1010                 attr = dsdb_attribute_by_lDAPDisplayName(schema,
1011                                                          req->op.mod.message->elements[i].name);
1012
1013                 if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
1014                         status = sec_access_check_ds(sd, acl_user_token(module),
1015                                              SEC_STD_WRITE_DAC,
1016                                              &access_granted,
1017                                              NULL,
1018                                              sid);
1019
1020                         if (!NT_STATUS_IS_OK(status)) {
1021                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1022                                                        "Object %s has no write dacl access\n",
1023                                                        ldb_dn_get_linearized(req->op.mod.message->dn));
1024                                 dsdb_acl_debug(sd,
1025                                                acl_user_token(module),
1026                                                req->op.mod.message->dn,
1027                                                true,
1028                                                10);
1029                                 ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1030                                 goto fail;
1031                         }
1032                 }
1033                 else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
1034                         ret = acl_check_self_membership(tmp_ctx,
1035                                                         module,
1036                                                         req,
1037                                                         sd,
1038                                                         sid,
1039                                                         guid,
1040                                                         attr);
1041                         if (ret != LDB_SUCCESS) {
1042                                 goto fail;
1043                         }
1044                 }
1045                 else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
1046                         /* this one is not affected by any rights, we should let it through
1047                            so that passwords_hash returns the correct error */
1048                         continue;
1049                 }
1050                 else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
1051                          (userPassword && ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0) ||
1052                          ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
1053                         ret = acl_check_password_rights(tmp_ctx,
1054                                                         module,
1055                                                         req,
1056                                                         sd,
1057                                                         sid,
1058                                                         guid,
1059                                                         userPassword);
1060                         if (ret != LDB_SUCCESS) {
1061                                 goto fail;
1062                         }
1063                 } else if (ldb_attr_cmp("servicePrincipalName", req->op.mod.message->elements[i].name) == 0) {
1064                         ret = acl_check_spn(tmp_ctx,
1065                                             module,
1066                                             req,
1067                                             sd,
1068                                             sid,
1069                                             guid,
1070                                             attr);
1071                         if (ret != LDB_SUCCESS) {
1072                                 goto fail;
1073                         }
1074                 } else {
1075
1076                 /* This basic attribute existence check with the right errorcode
1077                  * is needed since this module is the first one which requests
1078                  * schema attribute information.
1079                  * The complete attribute checking is done in the
1080                  * "objectclass_attrs" module behind this one.
1081                  */
1082                         if (!attr) {
1083                                 ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
1084                                                        req->op.mod.message->elements[i].name,
1085                                                ldb_dn_get_linearized(req->op.mod.message->dn));
1086                                 ret =  LDB_ERR_NO_SUCH_ATTRIBUTE;
1087                                 goto fail;
1088                         }
1089                         if (!insert_in_object_tree(tmp_ctx,
1090                                                    &attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
1091                                                    &new_node, &new_node)) {
1092                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1093                                                        "acl_modify: cannot add to object tree securityGUID\n");
1094                                 ret = LDB_ERR_OPERATIONS_ERROR;
1095                                 goto fail;
1096                         }
1097
1098                         if (!insert_in_object_tree(tmp_ctx,
1099                                                    &attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
1100                                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1101                                                        "acl_modify: cannot add to object tree attributeGUID\n");
1102                                 ret = LDB_ERR_OPERATIONS_ERROR;
1103                                 goto fail;
1104                         }
1105                 }
1106         }
1107
1108         if (root->num_of_children > 0) {
1109                 status = sec_access_check_ds(sd, acl_user_token(module),
1110                                              SEC_ADS_WRITE_PROP,
1111                                              &access_granted,
1112                                              root,
1113                                              sid);
1114
1115                 if (!NT_STATUS_IS_OK(status)) {
1116                         ldb_asprintf_errstring(ldb_module_get_ctx(module),
1117                                                "Object %s has no write property access\n",
1118                                                ldb_dn_get_linearized(req->op.mod.message->dn));
1119                         dsdb_acl_debug(sd,
1120                                        acl_user_token(module),
1121                                        req->op.mod.message->dn,
1122                                        true,
1123                                        10);
1124                         ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1125                         goto fail;
1126                 }
1127         }
1128
1129 success:
1130         talloc_free(tmp_ctx);
1131         return ldb_next_request(module, req);
1132 fail:
1133         talloc_free(tmp_ctx);
1134         return ret;
1135 }
1136
1137 /* similar to the modify for the time being.
1138  * We need to consider the special delete tree case, though - TODO */
1139 static int acl_delete(struct ldb_module *module, struct ldb_request *req)
1140 {
1141         int ret;
1142         struct ldb_dn *parent = ldb_dn_get_parent(req, req->op.del.dn);
1143         struct ldb_context *ldb;
1144         struct ldb_dn *nc_root;
1145         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1146
1147         if (as_system != NULL) {
1148                 as_system->critical = 0;
1149         }
1150
1151         DEBUG(10, ("ldb:acl_delete: %s\n", ldb_dn_get_linearized(req->op.del.dn)));
1152         if (dsdb_module_am_system(module) || as_system) {
1153                 return ldb_next_request(module, req);
1154         }
1155         if (ldb_dn_is_special(req->op.del.dn)) {
1156                 return ldb_next_request(module, req);
1157         }
1158
1159         ldb = ldb_module_get_ctx(module);
1160
1161         /* Make sure we aren't deleting a NC */
1162
1163         ret = dsdb_find_nc_root(ldb, req, req->op.del.dn, &nc_root);
1164         if (ret != LDB_SUCCESS) {
1165                 return ret;
1166         }
1167         if (ldb_dn_compare(nc_root, req->op.del.dn) == 0) {
1168                 talloc_free(nc_root);
1169                 DEBUG(10,("acl:deleting a NC\n"));
1170                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1171                 return ldb_module_done(req, NULL, NULL,
1172                                        LDB_ERR_UNWILLING_TO_PERFORM);
1173         }
1174         talloc_free(nc_root);
1175
1176         /* First check if we have delete object right */
1177         ret = dsdb_module_check_access_on_dn(module, req, req->op.del.dn,
1178                                              SEC_STD_DELETE, NULL, req);
1179         if (ret == LDB_SUCCESS) {
1180                 return ldb_next_request(module, req);
1181         }
1182
1183         /* Nope, we don't have delete object. Lets check if we have delete
1184          * child on the parent */
1185         ret = dsdb_module_check_access_on_dn(module, req, parent,
1186                                              SEC_ADS_DELETE_CHILD, NULL, req);
1187         if (ret != LDB_SUCCESS) {
1188                 return ret;
1189         }
1190
1191         return ldb_next_request(module, req);
1192 }
1193
1194 static int acl_rename(struct ldb_module *module, struct ldb_request *req)
1195 {
1196         int ret;
1197         struct ldb_dn *oldparent = ldb_dn_get_parent(req, req->op.rename.olddn);
1198         struct ldb_dn *newparent = ldb_dn_get_parent(req, req->op.rename.newdn);
1199         const struct dsdb_schema *schema;
1200         struct ldb_context *ldb;
1201         struct security_descriptor *sd = NULL;
1202         struct dom_sid *sid = NULL;
1203         struct ldb_result *acl_res;
1204         const struct GUID *guid;
1205         struct ldb_dn *nc_root;
1206         struct object_tree *root = NULL;
1207         struct object_tree *new_node = NULL;
1208         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1209         TALLOC_CTX *tmp_ctx = talloc_new(req);
1210         NTSTATUS status;
1211         uint32_t access_granted;
1212         const char *rdn_name;
1213         static const char *acl_attrs[] = {
1214                 "nTSecurityDescriptor",
1215                 "objectClass",
1216                 "objectSid",
1217                 NULL
1218         };
1219
1220         if (as_system != NULL) {
1221                 as_system->critical = 0;
1222         }
1223
1224         DEBUG(10, ("ldb:acl_rename: %s\n", ldb_dn_get_linearized(req->op.rename.olddn)));
1225         if (dsdb_module_am_system(module) || as_system) {
1226                 return ldb_next_request(module, req);
1227         }
1228         if (ldb_dn_is_special(req->op.rename.olddn)) {
1229                 return ldb_next_request(module, req);
1230         }
1231
1232         ldb = ldb_module_get_ctx(module);
1233
1234         /* Make sure we aren't renaming/moving a NC */
1235
1236         ret = dsdb_find_nc_root(ldb, req, req->op.rename.olddn, &nc_root);
1237         if (ret != LDB_SUCCESS) {
1238                 return ret;
1239         }
1240         if (ldb_dn_compare(nc_root, req->op.rename.olddn) == 0) {
1241                 talloc_free(nc_root);
1242                 DEBUG(10,("acl:renaming/moving a NC\n"));
1243                 /* Windows returns "ERR_UNWILLING_TO_PERFORM */
1244                 return ldb_module_done(req, NULL, NULL,
1245                                        LDB_ERR_UNWILLING_TO_PERFORM);
1246         }
1247         talloc_free(nc_root);
1248
1249         /* Look for the parent */
1250
1251         ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res,
1252                                     req->op.rename.olddn, acl_attrs,
1253                                     DSDB_FLAG_NEXT_MODULE |
1254                                     DSDB_SEARCH_SHOW_RECYCLED, req);
1255         /* we sould be able to find the parent */
1256         if (ret != LDB_SUCCESS) {
1257                 DEBUG(10,("acl: failed to find object %s\n",
1258                           ldb_dn_get_linearized(req->op.rename.olddn)));
1259                 talloc_free(tmp_ctx);
1260                 return ret;
1261         }
1262
1263         schema = dsdb_get_schema(ldb, acl_res);
1264         if (!schema) {
1265                 talloc_free(tmp_ctx);
1266                 return ldb_operr(ldb);
1267         }
1268
1269         guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
1270         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1271                                    &root, &new_node)) {
1272                 talloc_free(tmp_ctx);
1273                 return ldb_operr(ldb);
1274         };
1275
1276         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1277                                                           "name");
1278         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1279                                    &new_node, &new_node)) {
1280                 talloc_free(tmp_ctx);
1281                 return ldb_operr(ldb);
1282         };
1283
1284         rdn_name = ldb_dn_get_rdn_name(req->op.rename.olddn);
1285         if (rdn_name == NULL) {
1286                 talloc_free(tmp_ctx);
1287                 return ldb_operr(ldb);
1288         }
1289         guid = attribute_schemaid_guid_by_lDAPDisplayName(schema,
1290                                                           rdn_name);
1291         if (!insert_in_object_tree(tmp_ctx, guid, SEC_ADS_WRITE_PROP,
1292                                    &new_node, &new_node)) {
1293                 talloc_free(tmp_ctx);
1294                 return ldb_operr(ldb);
1295         };
1296
1297         ret = dsdb_get_sd_from_ldb_message(ldb, req, acl_res->msgs[0], &sd);
1298
1299         if (ret != LDB_SUCCESS) {
1300                 talloc_free(tmp_ctx);
1301                 return ldb_operr(ldb);
1302         }
1303         /* Theoretically we pass the check if the object has no sd */
1304         if (!sd) {
1305                 talloc_free(tmp_ctx);
1306                 return LDB_SUCCESS;
1307         }
1308         sid = samdb_result_dom_sid(req, acl_res->msgs[0], "objectSid");
1309         status = sec_access_check_ds(sd, acl_user_token(module),
1310                                      SEC_ADS_WRITE_PROP,
1311                                      &access_granted,
1312                                      root,
1313                                      sid);
1314
1315         if (!NT_STATUS_IS_OK(status)) {
1316                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1317                                        "Object %s has no wp on name\n",
1318                                        ldb_dn_get_linearized(req->op.rename.olddn));
1319                 dsdb_acl_debug(sd,
1320                           acl_user_token(module),
1321                           req->op.rename.olddn,
1322                           true,
1323                           10);
1324                 talloc_free(tmp_ctx);
1325                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1326         }
1327
1328         if (ldb_dn_compare(oldparent, newparent) == 0) {
1329                 /* regular rename, not move, nothing more to do */
1330                 talloc_free(tmp_ctx);
1331                 return ldb_next_request(module, req);
1332         }
1333
1334         /* new parent should have create child */
1335         root = NULL;
1336         new_node = NULL;
1337         guid = get_oc_guid_from_message(schema, acl_res->msgs[0]);
1338         if (!guid) {
1339                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1340                                        "acl:renamed object has no object class\n");
1341                 talloc_free(tmp_ctx);
1342                 return ldb_module_done(req, NULL, NULL,  LDB_ERR_OPERATIONS_ERROR);
1343         }
1344
1345         ret = dsdb_module_check_access_on_dn(module, req, newparent, SEC_ADS_CREATE_CHILD, guid, req);
1346         if (ret != LDB_SUCCESS) {
1347                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1348                                        "acl:access_denied renaming %s",
1349                                        ldb_dn_get_linearized(req->op.rename.olddn));
1350                 talloc_free(tmp_ctx);
1351                 return ret;
1352         }
1353         /* do we have delete object on the object? */
1354
1355         status = sec_access_check_ds(sd, acl_user_token(module),
1356                                      SEC_STD_DELETE,
1357                                      &access_granted,
1358                                      NULL,
1359                                      sid);
1360
1361         if (NT_STATUS_IS_OK(status)) {
1362                 talloc_free(tmp_ctx);
1363                 return ldb_next_request(module, req);
1364         }
1365         /* what about delete child on the current parent */
1366         ret = dsdb_module_check_access_on_dn(module, req, oldparent, SEC_ADS_DELETE_CHILD, NULL, req);
1367         if (ret != LDB_SUCCESS) {
1368                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
1369                                        "acl:access_denied renaming %s", ldb_dn_get_linearized(req->op.rename.olddn));
1370                 talloc_free(tmp_ctx);
1371                 return ldb_module_done(req, NULL, NULL, ret);
1372         }
1373
1374         talloc_free(tmp_ctx);
1375
1376         return ldb_next_request(module, req);
1377 }
1378
1379 static int acl_search_callback(struct ldb_request *req, struct ldb_reply *ares)
1380 {
1381         struct acl_context *ac;
1382         struct acl_private *data;
1383         struct ldb_result *acl_res;
1384         static const char *acl_attrs[] = {
1385                 "objectClass",
1386                 "nTSecurityDescriptor",
1387                 "objectSid",
1388                 NULL
1389         };
1390         int ret;
1391         unsigned int i;
1392
1393         ac = talloc_get_type(req->context, struct acl_context);
1394         data = talloc_get_type(ldb_module_get_private(ac->module), struct acl_private);
1395         if (!ares) {
1396                 return ldb_module_done(ac->req, NULL, NULL,
1397                                        LDB_ERR_OPERATIONS_ERROR);
1398         }
1399         if (ares->error != LDB_SUCCESS) {
1400                 return ldb_module_done(ac->req, ares->controls,
1401                                        ares->response, ares->error);
1402         }
1403
1404         switch (ares->type) {
1405         case LDB_REPLY_ENTRY:
1406                 if (ac->allowedAttributes
1407                     || ac->allowedChildClasses
1408                     || ac->allowedChildClassesEffective
1409                     || ac->allowedAttributesEffective
1410                     || ac->sDRightsEffective) {
1411                         ret = dsdb_module_search_dn(ac->module, ac, &acl_res, ares->message->dn,
1412                                                     acl_attrs,
1413                                                     DSDB_FLAG_NEXT_MODULE |
1414                                                     DSDB_SEARCH_SHOW_DELETED, req);
1415                         if (ret != LDB_SUCCESS) {
1416                                 return ldb_module_done(ac->req, NULL, NULL, ret);
1417                         }
1418                         if (ac->allowedAttributes || ac->allowedAttributesEffective) {
1419                                 ret = acl_allowedAttributes(ac->module, ac->schema, acl_res->msgs[0], ares->message, ac);
1420                                 if (ret != LDB_SUCCESS) {
1421                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1422                                 }
1423                         }
1424                         if (ac->allowedChildClasses) {
1425                                 ret = acl_childClasses(ac->module, ac->schema, acl_res->msgs[0],
1426                                                        ares->message, "allowedChildClasses");
1427                                 if (ret != LDB_SUCCESS) {
1428                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1429                                 }
1430                         }
1431                         if (ac->allowedChildClassesEffective) {
1432                                 ret = acl_childClassesEffective(ac->module, ac->schema,
1433                                                                 acl_res->msgs[0], ares->message, ac);
1434                                 if (ret != LDB_SUCCESS) {
1435                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1436                                 }
1437                         }
1438                         if (ac->sDRightsEffective) {
1439                                 ret = acl_sDRightsEffective(ac->module,
1440                                                             acl_res->msgs[0], ares->message, ac);
1441                                 if (ret != LDB_SUCCESS) {
1442                                         return ldb_module_done(ac->req, NULL, NULL, ret);
1443                                 }
1444                         }
1445                 }
1446                 if (data && data->password_attrs) {
1447                         if (!ac->am_system) {
1448                                 for (i = 0; data->password_attrs[i]; i++) {
1449                                         if ((!ac->userPassword) &&
1450                                             (ldb_attr_cmp(data->password_attrs[i],
1451                                                           "userPassword") == 0))
1452                                                 continue;
1453
1454                                         ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
1455                                 }
1456                         }
1457                 }
1458                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1459
1460         case LDB_REPLY_REFERRAL:
1461                 return ldb_module_send_referral(ac->req, ares->referral);
1462
1463         case LDB_REPLY_DONE:
1464                 return ldb_module_done(ac->req, ares->controls,
1465                                        ares->response, LDB_SUCCESS);
1466
1467         }
1468         return LDB_SUCCESS;
1469 }
1470
1471 static int acl_search(struct ldb_module *module, struct ldb_request *req)
1472 {
1473         struct ldb_context *ldb;
1474         struct acl_context *ac;
1475         struct ldb_request *down_req;
1476         struct acl_private *data;
1477         int ret;
1478         unsigned int i;
1479
1480         ldb = ldb_module_get_ctx(module);
1481
1482         ac = talloc_zero(req, struct acl_context);
1483         if (ac == NULL) {
1484                 return ldb_oom(ldb);
1485         }
1486         data = talloc_get_type(ldb_module_get_private(module), struct acl_private);
1487
1488         ac->module = module;
1489         ac->req = req;
1490         ac->am_system = dsdb_module_am_system(module);
1491         ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
1492         ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
1493         ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
1494         ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
1495         ac->sDRightsEffective = ldb_attr_in_list(req->op.search.attrs, "sDRightsEffective");
1496         ac->userPassword = dsdb_user_password_support(module, ac, req);
1497         ac->schema = dsdb_get_schema(ldb, ac);
1498
1499         /* replace any attributes in the parse tree that are private,
1500            so we don't allow a search for 'userPassword=penguin',
1501            just as we would not allow that attribute to be returned */
1502         if (ac->am_system) {
1503                 /* FIXME: We should copy the tree and keep the original unmodified. */
1504                 /* remove password attributes */
1505                 if (data && data->password_attrs) {
1506                         for (i = 0; data->password_attrs[i]; i++) {
1507                                 if ((!ac->userPassword) &&
1508                                     (ldb_attr_cmp(data->password_attrs[i],
1509                                                   "userPassword") == 0))
1510                                                 continue;
1511
1512                                 ldb_parse_tree_attr_replace(req->op.search.tree,
1513                                                             data->password_attrs[i],
1514                                                             "kludgeACLredactedattribute");
1515                         }
1516                 }
1517         }
1518         ret = ldb_build_search_req_ex(&down_req,
1519                                       ldb, ac,
1520                                       req->op.search.base,
1521                                       req->op.search.scope,
1522                                       req->op.search.tree,
1523                                       req->op.search.attrs,
1524                                       req->controls,
1525                                       ac, acl_search_callback,
1526                                       req);
1527         LDB_REQ_SET_LOCATION(down_req);
1528         if (ret != LDB_SUCCESS) {
1529                 return ret;
1530         }
1531         /* perform the search */
1532         return ldb_next_request(module, down_req);
1533 }
1534
1535 static int acl_extended(struct ldb_module *module, struct ldb_request *req)
1536 {
1537         struct ldb_context *ldb = ldb_module_get_ctx(module);
1538         struct ldb_control *as_system = ldb_request_get_control(req, LDB_CONTROL_AS_SYSTEM_OID);
1539
1540         /* allow everybody to read the sequence number */
1541         if (strcmp(req->op.extended.oid,
1542                    LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1543                 return ldb_next_request(module, req);
1544         }
1545
1546         if (dsdb_module_am_system(module) ||
1547             dsdb_module_am_administrator(module) || as_system) {
1548                 return ldb_next_request(module, req);
1549         } else {
1550                 ldb_asprintf_errstring(ldb,
1551                                        "acl_extended: "
1552                                        "attempted database modify not permitted. "
1553                                        "User %s is not SYSTEM or an administrator",
1554                                        acl_user_name(req, module));
1555                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
1556         }
1557 }
1558
1559 static const struct ldb_module_ops ldb_acl_module_ops = {
1560         .name              = "acl",
1561         .search            = acl_search,
1562         .add               = acl_add,
1563         .modify            = acl_modify,
1564         .del               = acl_delete,
1565         .rename            = acl_rename,
1566         .extended          = acl_extended,
1567         .init_context      = acl_module_init
1568 };
1569
1570 int ldb_acl_module_init(const char *version)
1571 {
1572         LDB_MODULE_CHECK_VERSION(version);
1573         return ldb_register_module(&ldb_acl_module_ops);
1574 }