source4/kdc/hdb-samba4.c

   1 /*
   2  * Copyright (c) 1999-2001, 2003, PADL Software Pty Ltd.
   3  * Copyright (c) 2004-2009, Andrew Bartlett <abartlet@samba.org>.
   4  * Copyright (c) 2004, Stefan Metzmacher <metze@samba.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * 3. Neither the name of PADL Software  nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "includes.h"
  36 #include "kdc/kdc-glue.h"
  37 #include "kdc/db-glue.h"
  38 #include "auth/auth_sam.h"
  39 #include "auth/common_auth.h"
  40 #include <ldb.h>
  41 #include "sdb.h"
  42 #include "sdb_hdb.h"
  43 #include "dsdb/samdb/samdb.h"
  44 #include "param/param.h"
  45 #include "../lib/tsocket/tsocket.h"
  46 #include "librpc/gen_ndr/ndr_winbind_c.h"
  47 #include "lib/messaging/irpc.h"
  48
  49 static krb5_error_code hdb_samba4_open(krb5_context context, HDB *db, int flags, mode_t mode)
  50 {
  51         if (db->hdb_master_key_set) {
  52                 krb5_error_code ret = HDB_ERR_NOENTRY;
  53                 krb5_warnx(context, "hdb_samba4_open: use of a master key incompatible with LDB\n");
  54                 krb5_set_error_message(context, ret, "hdb_samba4_open: use of a master key incompatible with LDB\n");
  55                 return ret;
  56         }
  57
  58         return 0;
  59 }
  60
  61 static krb5_error_code hdb_samba4_close(krb5_context context, HDB *db)
  62 {
  63         return 0;
  64 }
  65
  66 static krb5_error_code hdb_samba4_lock(krb5_context context, HDB *db, int operation)
  67 {
  68         return 0;
  69 }
  70
  71 static krb5_error_code hdb_samba4_unlock(krb5_context context, HDB *db)
  72 {
  73         return 0;
  74 }
  75
  76 static krb5_error_code hdb_samba4_rename(krb5_context context, HDB *db, const char *new_name)
  77 {
  78         return HDB_ERR_DB_INUSE;
  79 }
  80
  81 static krb5_error_code hdb_samba4_store(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
  82 {
  83         return HDB_ERR_DB_INUSE;
  84 }
  85
  86 static krb5_error_code hdb_samba4_remove(krb5_context context, HDB *db, krb5_const_principal principal)
  87 {
  88         return HDB_ERR_DB_INUSE;
  89 }
  90
  91 static krb5_error_code hdb_samba4_fetch_kvno(krb5_context context, HDB *db,
  92                                              krb5_const_principal principal,
  93                                              unsigned flags,
  94                                              krb5_kvno kvno,
  95                                              hdb_entry_ex *entry_ex)
  96 {
  97         struct samba_kdc_db_context *kdc_db_ctx;
  98         struct sdb_entry_ex sdb_entry_ex = {};
  99         krb5_error_code code, ret;
 100
 101         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 102                                            struct samba_kdc_db_context);
 103
 104         ret = samba_kdc_fetch(context,
 105                               kdc_db_ctx,
 106                               principal,
 107                               flags,
 108                               kvno,
 109                               &sdb_entry_ex);
 110         switch (ret) {
 111         case 0:
 112                 code = 0;
 113                 break;
 114         case SDB_ERR_WRONG_REALM:
 115                 /*
 116                  * If SDB_ERR_WRONG_REALM is returned we need to process the
 117                  * sdb_entry to fill the principal in the HDB entry.
 118                  */
 119                 code = HDB_ERR_WRONG_REALM;
 120                 break;
 121         case SDB_ERR_NOENTRY:
 122                 return HDB_ERR_NOENTRY;
 123         case SDB_ERR_NOT_FOUND_HERE:
 124                 return HDB_ERR_NOT_FOUND_HERE;
 125         default:
 126                 return ret;
 127         }
 128
 129         ret = sdb_entry_ex_to_hdb_entry_ex(context, &sdb_entry_ex, entry_ex);
 130         sdb_free_entry(&sdb_entry_ex);
 131
 132         if (code != 0 && ret != 0) {
 133                 code = ret;
 134         }
 135
 136         return code;
 137 }
 138
 139 static krb5_error_code hdb_samba4_firstkey(krb5_context context, HDB *db, unsigned flags,
 140                                         hdb_entry_ex *entry)
 141 {
 142         struct samba_kdc_db_context *kdc_db_ctx;
 143         struct sdb_entry_ex sdb_entry_ex = {};
 144         krb5_error_code ret;
 145
 146         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 147                                            struct samba_kdc_db_context);
 148
 149         ret = samba_kdc_firstkey(context, kdc_db_ctx, &sdb_entry_ex);
 150         switch (ret) {
 151         case 0:
 152                 break;
 153         case SDB_ERR_WRONG_REALM:
 154                 return HDB_ERR_WRONG_REALM;
 155         case SDB_ERR_NOENTRY:
 156                 return HDB_ERR_NOENTRY;
 157         case SDB_ERR_NOT_FOUND_HERE:
 158                 return HDB_ERR_NOT_FOUND_HERE;
 159         default:
 160                 return ret;
 161         }
 162
 163         ret = sdb_entry_ex_to_hdb_entry_ex(context, &sdb_entry_ex, entry);
 164         sdb_free_entry(&sdb_entry_ex);
 165         return ret;
 166 }
 167
 168 static krb5_error_code hdb_samba4_nextkey(krb5_context context, HDB *db, unsigned flags,
 169                                    hdb_entry_ex *entry)
 170 {
 171         struct samba_kdc_db_context *kdc_db_ctx;
 172         struct sdb_entry_ex sdb_entry_ex = {};
 173         krb5_error_code ret;
 174
 175         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 176                                            struct samba_kdc_db_context);
 177
 178         ret = samba_kdc_nextkey(context, kdc_db_ctx, &sdb_entry_ex);
 179         switch (ret) {
 180         case 0:
 181                 break;
 182         case SDB_ERR_WRONG_REALM:
 183                 return HDB_ERR_WRONG_REALM;
 184         case SDB_ERR_NOENTRY:
 185                 return HDB_ERR_NOENTRY;
 186         case SDB_ERR_NOT_FOUND_HERE:
 187                 return HDB_ERR_NOT_FOUND_HERE;
 188         default:
 189                 return ret;
 190         }
 191
 192         ret = sdb_entry_ex_to_hdb_entry_ex(context, &sdb_entry_ex, entry);
 193         sdb_free_entry(&sdb_entry_ex);
 194         return ret;
 195 }
 196
 197 static krb5_error_code hdb_samba4_destroy(krb5_context context, HDB *db)
 198 {
 199         talloc_free(db);
 200         return 0;
 201 }
 202
 203 static krb5_error_code
 204 hdb_samba4_check_constrained_delegation(krb5_context context, HDB *db,
 205                                         hdb_entry_ex *entry,
 206                                         krb5_const_principal target_principal)
 207 {
 208         struct samba_kdc_db_context *kdc_db_ctx;
 209         struct samba_kdc_entry *skdc_entry;
 210         krb5_error_code ret;
 211
 212         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 213                                            struct samba_kdc_db_context);
 214         skdc_entry = talloc_get_type_abort(entry->ctx,
 215                                            struct samba_kdc_entry);
 216
 217         ret = samba_kdc_check_s4u2proxy(context, kdc_db_ctx,
 218                                         skdc_entry,
 219                                         target_principal);
 220         switch (ret) {
 221         case 0:
 222                 break;
 223         case SDB_ERR_WRONG_REALM:
 224                 ret = HDB_ERR_WRONG_REALM;
 225                 break;
 226         case SDB_ERR_NOENTRY:
 227                 ret = HDB_ERR_NOENTRY;
 228                 break;
 229         case SDB_ERR_NOT_FOUND_HERE:
 230                 ret = HDB_ERR_NOT_FOUND_HERE;
 231                 break;
 232         default:
 233                 break;
 234         }
 235
 236         return ret;
 237 }
 238
 239 static krb5_error_code
 240 hdb_samba4_check_pkinit_ms_upn_match(krb5_context context, HDB *db,
 241                                      hdb_entry_ex *entry,
 242                                      krb5_const_principal certificate_principal)
 243 {
 244         struct samba_kdc_db_context *kdc_db_ctx;
 245         struct samba_kdc_entry *skdc_entry;
 246         krb5_error_code ret;
 247
 248         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 249                                            struct samba_kdc_db_context);
 250         skdc_entry = talloc_get_type_abort(entry->ctx,
 251                                            struct samba_kdc_entry);
 252
 253         ret = samba_kdc_check_pkinit_ms_upn_match(context, kdc_db_ctx,
 254                                                   skdc_entry,
 255                                                   certificate_principal);
 256         switch (ret) {
 257         case 0:
 258                 break;
 259         case SDB_ERR_WRONG_REALM:
 260                 ret = HDB_ERR_WRONG_REALM;
 261                 break;
 262         case SDB_ERR_NOENTRY:
 263                 ret = HDB_ERR_NOENTRY;
 264                 break;
 265         case SDB_ERR_NOT_FOUND_HERE:
 266                 ret = HDB_ERR_NOT_FOUND_HERE;
 267                 break;
 268         default:
 269                 break;
 270         }
 271
 272         return ret;
 273 }
 274
 275 static krb5_error_code
 276 hdb_samba4_check_s4u2self(krb5_context context, HDB *db,
 277                           hdb_entry_ex *entry,
 278                           krb5_const_principal target_principal)
 279 {
 280         struct samba_kdc_db_context *kdc_db_ctx;
 281         struct samba_kdc_entry *skdc_entry;
 282         krb5_error_code ret;
 283
 284         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 285                                            struct samba_kdc_db_context);
 286         skdc_entry = talloc_get_type_abort(entry->ctx,
 287                                            struct samba_kdc_entry);
 288
 289         ret = samba_kdc_check_s4u2self(context, kdc_db_ctx,
 290                                        skdc_entry,
 291                                        target_principal);
 292         switch (ret) {
 293         case 0:
 294                 break;
 295         case SDB_ERR_WRONG_REALM:
 296                 ret = HDB_ERR_WRONG_REALM;
 297                 break;
 298         case SDB_ERR_NOENTRY:
 299                 ret = HDB_ERR_NOENTRY;
 300                 break;
 301         case SDB_ERR_NOT_FOUND_HERE:
 302                 ret = HDB_ERR_NOT_FOUND_HERE;
 303                 break;
 304         default:
 305                 break;
 306         }
 307
 308         return ret;
 309 }
 310
 311 static void reset_bad_password_netlogon(TALLOC_CTX *mem_ctx,
 312                                         struct samba_kdc_db_context *kdc_db_ctx,
 313                                         struct netr_SendToSamBase *send_to_sam)
 314 {
 315         struct dcerpc_binding_handle *irpc_handle;
 316         struct winbind_SendToSam req;
 317
 318         irpc_handle = irpc_binding_handle_by_name(mem_ctx, kdc_db_ctx->msg_ctx,
 319                                                   "winbind_server",
 320                                                   &ndr_table_winbind);
 321
 322         if (irpc_handle == NULL) {
 323                 DEBUG(0, ("No winbind_server running!\n"));
 324                 return;
 325         }
 326
 327         req.in.message = *send_to_sam;
 328
 329         dcerpc_winbind_SendToSam_r_send(mem_ctx, kdc_db_ctx->ev_ctx,
 330                                         irpc_handle, &req);
 331 }
 332
 333 static void send_bad_password_netlogon(TALLOC_CTX *mem_ctx,
 334                                        struct samba_kdc_db_context *kdc_db_ctx,
 335                                        struct auth_usersupplied_info *user_info)
 336 {
 337         struct dcerpc_binding_handle *irpc_handle;
 338         struct winbind_SamLogon req;
 339         struct netr_IdentityInfo *identity_info;
 340         struct netr_NetworkInfo *network_info;
 341
 342         irpc_handle = irpc_binding_handle_by_name(mem_ctx, kdc_db_ctx->msg_ctx,
 343                                                   "winbind_server",
 344                                                   &ndr_table_winbind);
 345         if (irpc_handle == NULL) {
 346                 DEBUG(0, ("Winbind forwarding for [%s]\\[%s] failed, "
 347                           "no winbind_server running!\n",
 348                           user_info->mapped.domain_name, user_info->mapped.account_name));
 349                 return;
 350         }
 351
 352         network_info = talloc_zero(mem_ctx, struct netr_NetworkInfo);
 353         if (network_info == NULL) {
 354                 DEBUG(0, ("Winbind forwarding failed: No memory\n"));
 355                 return;
 356         }
 357
 358         identity_info = &network_info->identity_info;
 359         req.in.logon_level = 2;
 360         req.in.logon.network = network_info;
 361
 362         identity_info->domain_name.string = user_info->mapped.domain_name;
 363         identity_info->parameter_control = user_info->logon_parameters; /* TODO */
 364         identity_info->logon_id_low = 0;
 365         identity_info->logon_id_high = 0;
 366         identity_info->account_name.string = user_info->mapped.account_name;
 367         identity_info->workstation.string
 368                 = talloc_asprintf(identity_info, "krb5-bad-pw on RODC from %s",
 369                                   tsocket_address_string(user_info->remote_host,
 370                                                          identity_info));
 371         if (identity_info->workstation.string == NULL) {
 372                 DEBUG(0, ("Winbind forwarding failed: No memory allocating workstation string\n"));
 373                 return;
 374         }
 375
 376         req.in.validation_level = 3;
 377
 378         /*
 379          * The memory in identity_info and user_info only needs to be
 380          * valid until the end of this function call, as it will be
 381          * pushed to NDR during this call
 382          */
 383
 384         dcerpc_winbind_SamLogon_r_send(mem_ctx, kdc_db_ctx->ev_ctx,
 385                                        irpc_handle, &req);
 386 }
 387
 388 static krb5_error_code hdb_samba4_auth_status(krb5_context context, HDB *db,
 389                                               hdb_entry_ex *entry,
 390                                               struct sockaddr *from_addr,
 391                                               const char *original_client_name,
 392                                               const char *auth_type,
 393                                               int hdb_auth_status)
 394 {
 395         struct samba_kdc_db_context *kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 396                                                                         struct samba_kdc_db_context);
 397
 398         struct ldb_dn *domain_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
 399
 400         /*
 401          * Forcing this via the NTLM auth structure is not ideal, but
 402          * it is the most practical option right now, and ensures the
 403          * logs are consistent, even if some elements are always NULL.
 404          */
 405         struct auth_usersupplied_info ui = {
 406                 .mapped_state = true,
 407                 .was_mapped = true,
 408                 .client = {
 409                         .account_name = original_client_name,
 410                         .domain_name = NULL,
 411                 },
 412                 .service_description = "Kerberos KDC",
 413                 .auth_description = "ENC-TS Pre-authentication",
 414                 .password_type = auth_type
 415         };
 416
 417         size_t sa_socklen = 0;
 418
 419         switch (from_addr->sa_family) {
 420         case AF_INET:
 421                 sa_socklen = sizeof(struct sockaddr_in);
 422                 break;
 423 #ifdef HAVE_IPV6
 424         case AF_INET6:
 425                 sa_socklen = sizeof(struct sockaddr_in6);
 426                 break;
 427 #endif
 428         }
 429
 430         switch (hdb_auth_status) {
 431         case HDB_AUTHZ_SUCCESS:
 432         {
 433                 TALLOC_CTX *frame = talloc_stackframe();
 434                 struct samba_kdc_entry *p = talloc_get_type(entry->ctx,
 435                                                             struct samba_kdc_entry);
 436                 struct netr_SendToSamBase *send_to_sam = NULL;
 437
 438                 /*
 439                  * TODO: We could log the AS-REQ authorization success here as
 440                  * well.  However before we do that, we need to pass
 441                  * in the PAC here or re-calculate it.
 442                  */
 443                 authsam_logon_success_accounting(kdc_db_ctx->samdb, p->msg,
 444                                                  domain_dn, true, &send_to_sam);
 445                 if (kdc_db_ctx->rodc && send_to_sam != NULL) {
 446                         reset_bad_password_netlogon(frame, kdc_db_ctx, send_to_sam);
 447                 }
 448                 talloc_free(frame);
 449                 break;
 450         }
 451         case HDB_AUTH_INVALID_SIGNATURE:
 452                 break;
 453         case HDB_AUTH_CORRECT_PASSWORD:
 454         case HDB_AUTH_WRONG_PASSWORD:
 455         {
 456                 TALLOC_CTX *frame = talloc_stackframe();
 457                 struct samba_kdc_entry *p = talloc_get_type(entry->ctx,
 458                                                             struct samba_kdc_entry);
 459                 struct dom_sid *sid
 460                         = samdb_result_dom_sid(frame, p->msg, "objectSid");
 461                 const char *account_name
 462                         = ldb_msg_find_attr_as_string(p->msg, "sAMAccountName", NULL);
 463                 const char *domain_name = lpcfg_sam_name(p->kdc_db_ctx->lp_ctx);
 464                 struct tsocket_address *remote_host;
 465                 NTSTATUS status;
 466                 int ret;
 467
 468                 ret = tsocket_address_bsd_from_sockaddr(frame, from_addr,
 469                                                         sa_socklen,
 470                                                         &remote_host);
 471                 if (ret != 0) {
 472                         ui.remote_host = NULL;
 473                 } else {
 474                         ui.remote_host = remote_host;
 475                 }
 476
 477                 ui.mapped.account_name = account_name;
 478                 ui.mapped.domain_name = domain_name;
 479
 480                 if (hdb_auth_status == HDB_AUTH_WRONG_PASSWORD) {
 481                         authsam_update_bad_pwd_count(kdc_db_ctx->samdb, p->msg, domain_dn);
 482                         status = NT_STATUS_WRONG_PASSWORD;
 483                         /*
 484                          * TODO We currently send a bad password via NETLOGON,
 485                          * however, it should probably forward the ticket to
 486                          * another KDC to allow login after password changes.
 487                          */
 488                         if (kdc_db_ctx->rodc) {
 489                                 send_bad_password_netlogon(frame, kdc_db_ctx, &ui);
 490                         }
 491                 } else {
 492                         status = NT_STATUS_OK;
 493                 }
 494
 495                 log_authentication_event(kdc_db_ctx->msg_ctx,
 496                                          kdc_db_ctx->lp_ctx,
 497                                          &ui,
 498                                          status,
 499                                          domain_name,
 500                                          account_name,
 501                                          NULL,
 502                                          sid);
 503                 TALLOC_FREE(frame);
 504                 break;
 505         }
 506         case HDB_AUTH_CLIENT_UNKNOWN:
 507         {
 508                 struct tsocket_address *remote_host;
 509                 int ret;
 510                 TALLOC_CTX *frame = talloc_stackframe();
 511                 ret = tsocket_address_bsd_from_sockaddr(frame, from_addr,
 512                                                         sa_socklen,
 513                                                         &remote_host);
 514                 if (ret != 0) {
 515                         ui.remote_host = NULL;
 516                 } else {
 517                         ui.remote_host = remote_host;
 518                 }
 519
 520                 log_authentication_event(kdc_db_ctx->msg_ctx,
 521                                          kdc_db_ctx->lp_ctx,
 522                                          &ui,
 523                                          NT_STATUS_NO_SUCH_USER,
 524                                          NULL, NULL,
 525                                          NULL, NULL);
 526                 TALLOC_FREE(frame);
 527                 break;
 528         }
 529         }
 530         return 0;
 531 }
 532
 533 /* This interface is to be called by the KDC and libnet_keytab_dump,
 534  * which is expecting Samba calling conventions.
 535  * It is also called by a wrapper (hdb_samba4_create) from the
 536  * kpasswdd -> krb5 -> keytab_hdb -> hdb code */
 537
 538 NTSTATUS hdb_samba4_create_kdc(struct samba_kdc_base_context *base_ctx,
 539                                krb5_context context, struct HDB **db)
 540 {
 541         struct samba_kdc_db_context *kdc_db_ctx;
 542         NTSTATUS nt_status;
 543
 544         if (hdb_interface_version != HDB_INTERFACE_VERSION) {
 545                 krb5_set_error_message(context, EINVAL, "Heimdal HDB interface version mismatch between build-time and run-time libraries!");
 546                 return NT_STATUS_ERROR_DS_INCOMPATIBLE_VERSION;
 547         }
 548
 549         *db = talloc(base_ctx, HDB);
 550         if (!*db) {
 551                 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 552                 return NT_STATUS_NO_MEMORY;
 553         }
 554
 555         (*db)->hdb_master_key_set = 0;
 556         (*db)->hdb_db = NULL;
 557         (*db)->hdb_capability_flags = HDB_CAP_F_HANDLE_ENTERPRISE_PRINCIPAL;
 558
 559         nt_status = samba_kdc_setup_db_ctx(*db, base_ctx, &kdc_db_ctx);
 560         if (!NT_STATUS_IS_OK(nt_status)) {
 561                 talloc_free(*db);
 562                 return nt_status;
 563         }
 564         (*db)->hdb_db = kdc_db_ctx;
 565
 566         (*db)->hdb_dbc = NULL;
 567         (*db)->hdb_open = hdb_samba4_open;
 568         (*db)->hdb_close = hdb_samba4_close;
 569         (*db)->hdb_fetch_kvno = hdb_samba4_fetch_kvno;
 570         (*db)->hdb_store = hdb_samba4_store;
 571         (*db)->hdb_remove = hdb_samba4_remove;
 572         (*db)->hdb_firstkey = hdb_samba4_firstkey;
 573         (*db)->hdb_nextkey = hdb_samba4_nextkey;
 574         (*db)->hdb_lock = hdb_samba4_lock;
 575         (*db)->hdb_unlock = hdb_samba4_unlock;
 576         (*db)->hdb_rename = hdb_samba4_rename;
 577         /* we don't implement these, as we are not a lockable database */
 578         (*db)->hdb__get = NULL;
 579         (*db)->hdb__put = NULL;
 580         /* kadmin should not be used for deletes - use other tools instead */
 581         (*db)->hdb__del = NULL;
 582         (*db)->hdb_destroy = hdb_samba4_destroy;
 583
 584         (*db)->hdb_auth_status = hdb_samba4_auth_status;
 585         (*db)->hdb_check_constrained_delegation = hdb_samba4_check_constrained_delegation;
 586         (*db)->hdb_check_pkinit_ms_upn_match = hdb_samba4_check_pkinit_ms_upn_match;
 587         (*db)->hdb_check_s4u2self = hdb_samba4_check_s4u2self;
 588
 589         return NT_STATUS_OK;
 590 }