source/kdc/hdb-ldb.c

   1 /*
   2  * Copyright (c) 1999-2001, 2003, PADL Software Pty Ltd.
   3  * Copyright (c) 2004, 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 "system/time.h"
  37 #include "kdc.h"
  38 #include "dsdb/common/flags.h"
  39 #include "hdb.h"
  40 #include "krb5_locl.h"
  41 #include "lib/ldb/include/ldb.h"
  42 #include "lib/ldb/include/ldb_errors.h"
  43 #include "librpc/gen_ndr/netlogon.h"
  44 #include "auth/auth.h"
  45 #include "auth/credentials/credentials.h"
  46 #include "auth/auth_sam.h"
  47 #include "util/util_ldb.h"
  48 #include "dsdb/samdb/samdb.h"
  49 #include "librpc/ndr/libndr.h"
  50 #include "librpc/gen_ndr/ndr_drsblobs.h"
  51 #include "libcli/auth/libcli_auth.h"
  52 #include "param/param.h"
  53
  54 enum hdb_ldb_ent_type
  55 { HDB_LDB_ENT_TYPE_CLIENT, HDB_LDB_ENT_TYPE_SERVER,
  56   HDB_LDB_ENT_TYPE_KRBTGT, HDB_LDB_ENT_TYPE_ANY };
  57
  58 static const char *realm_ref_attrs[] = {
  59         "nCName",
  60         "dnsRoot",
  61         NULL
  62 };
  63
  64 static KerberosTime ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, KerberosTime default_val)
  65 {
  66     const char *tmp;
  67     const char *gentime;
  68     struct tm tm;
  69
  70     gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
  71     if (!gentime)
  72         return default_val;
  73
  74     tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
  75     if (tmp == NULL) {
  76             return default_val;
  77     }
  78
  79     return timegm(&tm);
  80 }
  81
  82 static HDBFlags uf2HDBFlags(krb5_context context, int userAccountControl, enum hdb_ldb_ent_type ent_type)
  83 {
  84         HDBFlags flags = int2HDBFlags(0);
  85
  86         /* we don't allow kadmin deletes */
  87         flags.immutable = 1;
  88
  89         /* mark the principal as invalid to start with */
  90         flags.invalid = 1;
  91
  92         flags.renewable = 1;
  93
  94         /* All accounts are servers, but this may be disabled again in the caller */
  95         flags.server = 1;
  96
  97         /* Account types - clear the invalid bit if it turns out to be valid */
  98         if (userAccountControl & UF_NORMAL_ACCOUNT) {
  99                 if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
 100                         flags.client = 1;
 101                 }
 102                 flags.invalid = 0;
 103         }
 104
 105         if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
 106                 if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
 107                         flags.client = 1;
 108                 }
 109                 flags.invalid = 0;
 110         }
 111         if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
 112                 if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
 113                         flags.client = 1;
 114                 }
 115                 flags.invalid = 0;
 116         }
 117         if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
 118                 if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
 119                         flags.client = 1;
 120                 }
 121                 flags.invalid = 0;
 122         }
 123
 124         /* Not permitted to act as a client if disabled */
 125         if (userAccountControl & UF_ACCOUNTDISABLE) {
 126                 flags.client = 0;
 127         }
 128         if (userAccountControl & UF_LOCKOUT) {
 129                 flags.invalid = 1;
 130         }
 131 /*
 132         if (userAccountControl & UF_PASSWORD_NOTREQD) {
 133                 flags.invalid = 1;
 134         }
 135 */
 136 /*
 137         UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
 138 */
 139         if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
 140                 flags.invalid = 1;
 141         }
 142
 143 /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in LDB_message2entry() */
 144
 145 /*
 146         if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
 147                 flags.invalid = 1;
 148         }
 149 */
 150         if (userAccountControl & UF_SMARTCARD_REQUIRED) {
 151                 flags.require_hwauth = 1;
 152         }
 153         if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
 154                 flags.ok_as_delegate = 1;
 155         }
 156         if (!(userAccountControl & UF_NOT_DELEGATED)) {
 157                 flags.forwardable = 1;
 158                 flags.proxiable = 1;
 159         }
 160
 161         if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
 162                 flags.require_preauth = 0;
 163         } else {
 164                 flags.require_preauth = 1;
 165
 166         }
 167         return flags;
 168 }
 169
 170 static int hdb_ldb_destrutor(struct hdb_ldb_private *private)
 171 {
 172     hdb_entry_ex *entry_ex = private->entry_ex;
 173     free_hdb_entry(&entry_ex->entry);
 174     return 0;
 175 }
 176
 177 static void hdb_ldb_free_entry(krb5_context context, hdb_entry_ex *entry_ex)
 178 {
 179         talloc_free(entry_ex->ctx);
 180 }
 181
 182 static krb5_error_code LDB_message2entry_keys(krb5_context context,
 183                                               TALLOC_CTX *mem_ctx,
 184                                               struct ldb_message *msg,
 185                                               unsigned int userAccountControl,
 186                                               hdb_entry_ex *entry_ex)
 187 {
 188         krb5_error_code ret = 0;
 189         enum ndr_err_code ndr_err;
 190         struct samr_Password *hash;
 191         const struct ldb_val *sc_val;
 192         struct supplementalCredentialsBlob scb;
 193         struct supplementalCredentialsPackage *scp = NULL;
 194         struct package_PrimaryKerberosBlob _pkb;
 195         struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
 196         uint32_t i;
 197         uint32_t allocated_keys = 0;
 198
 199         entry_ex->entry.keys.val = NULL;
 200         entry_ex->entry.keys.len = 0;
 201
 202         entry_ex->entry.kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
 203
 204         /* Get keys from the db */
 205
 206         hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
 207         sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
 208
 209         /* unicodePwd for enctype 0x17 (23) if present */
 210         if (hash) {
 211                 allocated_keys++;
 212         }
 213
 214         /* supplementalCredentials if present */
 215         if (sc_val) {
 216                 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, &scb,
 217                                                    (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
 218                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 219                         dump_data(0, sc_val->data, sc_val->length);
 220                         ret = EINVAL;
 221                         goto out;
 222                 }
 223
 224                 for (i=0; i < scb.sub.num_packages; i++) {
 225                         if (scb.sub.packages[i].unknown1 != 0x00000001) {
 226                                 continue;
 227                         }
 228
 229                         if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) != 0) {
 230                                 continue;
 231                         }
 232
 233                         if (!scb.sub.packages[i].data || !scb.sub.packages[i].data[0]) {
 234                                 continue;
 235                         }
 236
 237                         scp = &scb.sub.packages[i];
 238                         break;
 239                 }
 240         }
 241         /* Primary:Kerberos element of supplementalCredentials */
 242         if (scp) {
 243                 DATA_BLOB blob;
 244
 245                 blob = strhex_to_data_blob(scp->data);
 246                 if (!blob.data) {
 247                         ret = ENOMEM;
 248                         goto out;
 249                 }
 250                 talloc_steal(mem_ctx, blob.data);
 251
 252                 /* TODO: use ndr_pull_struct_blob_all(), when the ndr layer handles it correct with relative pointers */
 253                 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &_pkb,
 254                                                (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
 255                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 256                         krb5_set_error_string(context, "LDB_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 257                         krb5_warnx(context, "LDB_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 258                         ret = EINVAL;
 259                         goto out;
 260                 }
 261
 262                 if (_pkb.version != 3) {
 263                         krb5_set_error_string(context, "LDB_message2entry_keys: could not parse PrimaryKerberos not version 3");
 264                         krb5_warnx(context, "LDB_message2entry_keys: could not parse PrimaryKerberos not version 3");
 265                         ret = EINVAL;
 266                         goto out;
 267                 }
 268
 269                 pkb3 = &_pkb.ctr.ctr3;
 270
 271                 allocated_keys += pkb3->num_keys;
 272         }
 273
 274         if (allocated_keys == 0) {
 275                 /* oh, no password.  Apparently (comment in
 276                  * hdb-ldap.c) this violates the ASN.1, but this
 277                  * allows an entry with no keys (yet). */
 278                 return 0;
 279         }
 280
 281         /* allocate space to decode into */
 282         entry_ex->entry.keys.len = 0;
 283         entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(Key));
 284         if (entry_ex->entry.keys.val == NULL) {
 285                 ret = ENOMEM;
 286                 goto out;
 287         }
 288
 289         if (hash && !(userAccountControl & UF_USE_DES_KEY_ONLY)) {
 290                 Key key;
 291
 292                 key.mkvno = 0;
 293                 key.salt = NULL; /* No salt for this enc type */
 294
 295                 ret = krb5_keyblock_init(context,
 296                                          ENCTYPE_ARCFOUR_HMAC_MD5,
 297                                          hash->hash, sizeof(hash->hash),
 298                                          &key.key);
 299                 if (ret) {
 300                         goto out;
 301                 }
 302
 303                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 304                 entry_ex->entry.keys.len++;
 305         }
 306
 307         if (pkb3) {
 308                 for (i=0; i < pkb3->num_keys; i++) {
 309                         bool use = true;
 310                         Key key;
 311
 312                         if (!pkb3->keys[i].value) continue;
 313
 314                         if (userAccountControl & UF_USE_DES_KEY_ONLY) {
 315                                 switch (pkb3->keys[i].keytype) {
 316                                 case ENCTYPE_DES_CBC_CRC:
 317                                 case ENCTYPE_DES_CBC_MD5:
 318                                         break;
 319                                 default:
 320                                         use = false;
 321                                         break;
 322                                 }
 323                         }
 324
 325                         if (!use) continue;
 326
 327                         key.mkvno = 0;
 328
 329                         if (pkb3->salt.string) {
 330                                 DATA_BLOB salt;
 331
 332                                 salt = data_blob_string_const(pkb3->salt.string);
 333
 334                                 key.salt = calloc(1, sizeof(*key.salt));
 335                                 if (key.salt == NULL) {
 336                                         ret = ENOMEM;
 337                                         goto out;
 338                                 }
 339
 340                                 key.salt->type = hdb_pw_salt;
 341
 342                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
 343                                 if (ret) {
 344                                         free(key.salt);
 345                                         key.salt = NULL;
 346                                         goto out;
 347                                 }
 348                         }
 349
 350                         ret = krb5_keyblock_init(context,
 351                                                  pkb3->keys[i].keytype,
 352                                                  pkb3->keys[i].value->data,
 353                                                  pkb3->keys[i].value->length,
 354                                                  &key.key);
 355                         if (ret) {
 356                                 if (key.salt) {
 357                                         free_Salt(key.salt);
 358                                         free(key.salt);
 359                                         key.salt = NULL;
 360                                 }
 361                                 goto out;
 362                         }
 363
 364                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 365                         entry_ex->entry.keys.len++;
 366                 }
 367         }
 368
 369 out:
 370         if (ret != 0) {
 371                 entry_ex->entry.keys.len = 0;
 372         }
 373         if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
 374                 free(entry_ex->entry.keys.val);
 375                 entry_ex->entry.keys.val = NULL;
 376         }
 377         return ret;
 378 }
 379
 380 /*
 381  * Construct an hdb_entry from a directory entry.
 382  */
 383 static krb5_error_code LDB_message2entry(krb5_context context, HDB *db,
 384                                          TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 385                                          enum hdb_ldb_ent_type ent_type,
 386                                          struct ldb_message *msg,
 387                                          struct ldb_message *realm_ref_msg,
 388                                          hdb_entry_ex *entry_ex)
 389 {
 390         unsigned int userAccountControl;
 391         int i;
 392         krb5_error_code ret = 0;
 393         krb5_boolean is_computer = FALSE;
 394         const char *dnsdomain = ldb_msg_find_attr_as_string(realm_ref_msg, "dnsRoot", NULL);
 395         char *realm = strupper_talloc(mem_ctx, dnsdomain);
 396         struct ldb_dn *domain_dn = samdb_result_dn((struct ldb_context *)db->hdb_db,
 397                                                         mem_ctx,
 398                                                         realm_ref_msg,
 399                                                         "nCName",
 400                                                         ldb_dn_new(mem_ctx, (struct ldb_context *)db->hdb_db, NULL));
 401
 402         struct hdb_ldb_private *private;
 403         NTTIME acct_expiry;
 404
 405         struct ldb_message_element *objectclasses;
 406         struct ldb_val computer_val;
 407         computer_val.data = discard_const_p(uint8_t,"computer");
 408         computer_val.length = strlen((const char *)computer_val.data);
 409
 410         objectclasses = ldb_msg_find_element(msg, "objectClass");
 411
 412         if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
 413                 is_computer = TRUE;
 414         }
 415
 416         memset(entry_ex, 0, sizeof(*entry_ex));
 417
 418         if (!realm) {
 419                 krb5_set_error_string(context, "talloc_strdup: out of memory");
 420                 ret = ENOMEM;
 421                 goto out;
 422         }
 423
 424         private = talloc(mem_ctx, struct hdb_ldb_private);
 425         if (!private) {
 426                 ret = ENOMEM;
 427                 goto out;
 428         }
 429
 430         private->entry_ex = entry_ex;
 431
 432         talloc_set_destructor(private, hdb_ldb_destrutor);
 433
 434         entry_ex->ctx = private;
 435         entry_ex->free_entry = hdb_ldb_free_entry;
 436
 437         userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
 438
 439
 440         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 441         if (ent_type == HDB_LDB_ENT_TYPE_ANY && principal == NULL) {
 442                 const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
 443                 if (!samAccountName) {
 444                         krb5_set_error_string(context, "LDB_message2entry: no samAccountName present");
 445                         ret = ENOENT;
 446                         goto out;
 447                 }
 448                 samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
 449                 krb5_make_principal(context, &entry_ex->entry.principal, realm, samAccountName, NULL);
 450         } else {
 451                 char *strdup_realm;
 452                 ret = copy_Principal(principal, entry_ex->entry.principal);
 453                 if (ret) {
 454                         krb5_clear_error_string(context);
 455                         goto out;
 456                 }
 457
 458                 /* While we have copied the client principal, tests
 459                  * show that Win2k3 returns the 'corrected' realm, not
 460                  * the client-specified realm.  This code attempts to
 461                  * replace the client principal's realm with the one
 462                  * we determine from our records */
 463
 464                 /* this has to be with malloc() */
 465                 strdup_realm = strdup(realm);
 466                 if (!strdup_realm) {
 467                         ret = ENOMEM;
 468                         krb5_clear_error_string(context);
 469                         goto out;
 470                 }
 471                 free(*krb5_princ_realm(context, entry_ex->entry.principal));
 472                 krb5_princ_set_realm(context, entry_ex->entry.principal, &strdup_realm);
 473         }
 474
 475         entry_ex->entry.flags = uf2HDBFlags(context, userAccountControl, ent_type);
 476
 477         if (ent_type == HDB_LDB_ENT_TYPE_KRBTGT) {
 478                 entry_ex->entry.flags.invalid = 0;
 479                 entry_ex->entry.flags.server = 1;
 480                 entry_ex->entry.flags.forwardable = 1;
 481                 entry_ex->entry.flags.ok_as_delegate = 1;
 482         }
 483
 484         if (lp_parm_bool(global_loadparm, NULL, "kdc", "require spn for service", true)) {
 485                 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
 486                         entry_ex->entry.flags.server = 0;
 487                 }
 488         }
 489
 490         /* use 'whenCreated' */
 491         entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 492         /* use '???' */
 493         entry_ex->entry.created_by.principal = NULL;
 494
 495         entry_ex->entry.modified_by = (Event *) malloc(sizeof(Event));
 496         if (entry_ex->entry.modified_by == NULL) {
 497                 krb5_set_error_string(context, "malloc: out of memory");
 498                 ret = ENOMEM;
 499                 goto out;
 500         }
 501
 502         /* use 'whenChanged' */
 503         entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
 504         /* use '???' */
 505         entry_ex->entry.modified_by->principal = NULL;
 506
 507         entry_ex->entry.valid_start = NULL;
 508
 509         acct_expiry = samdb_result_nttime(msg, "accountExpires", (NTTIME)-1);
 510         if ((acct_expiry == (NTTIME)-1) ||
 511             (acct_expiry == 0x7FFFFFFFFFFFFFFFULL)) {
 512                 entry_ex->entry.valid_end = NULL;
 513         } else {
 514                 entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
 515                 if (entry_ex->entry.valid_end == NULL) {
 516                         ret = ENOMEM;
 517                         goto out;
 518                 }
 519                 *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
 520         }
 521
 522         if (ent_type != HDB_LDB_ENT_TYPE_KRBTGT) {
 523                 NTTIME must_change_time
 524                         = samdb_result_force_password_change((struct ldb_context *)db->hdb_db, mem_ctx,
 525                                                              domain_dn, msg);
 526                 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
 527                         entry_ex->entry.pw_end = NULL;
 528                 } else {
 529                         entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
 530                         if (entry_ex->entry.pw_end == NULL) {
 531                                 ret = ENOMEM;
 532                                 goto out;
 533                         }
 534                         *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
 535                 }
 536         } else {
 537                 entry_ex->entry.pw_end = NULL;
 538         }
 539
 540         entry_ex->entry.max_life = NULL;
 541
 542         entry_ex->entry.max_renew = NULL;
 543
 544         entry_ex->entry.generation = NULL;
 545
 546         /* Get keys from the db */
 547         ret = LDB_message2entry_keys(context, private, msg, userAccountControl, entry_ex);
 548         if (ret) {
 549                 /* Could be bougus data in the entry, or out of memory */
 550                 goto out;
 551         }
 552
 553         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 554         if (entry_ex->entry.etypes == NULL) {
 555                 krb5_clear_error_string(context);
 556                 ret = ENOMEM;
 557                 goto out;
 558         }
 559         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 560         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 561         if (entry_ex->entry.etypes->val == NULL) {
 562                 krb5_clear_error_string(context);
 563                 ret = ENOMEM;
 564                 goto out;
 565         }
 566         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 567                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 568         }
 569
 570
 571         private->msg = talloc_steal(private, msg);
 572         private->realm_ref_msg = talloc_steal(private, realm_ref_msg);
 573         private->samdb = (struct ldb_context *)db->hdb_db;
 574
 575 out:
 576         if (ret != 0) {
 577                 /* This doesn't free ent itself, that is for the eventual caller to do */
 578                 hdb_free_entry(context, entry_ex);
 579         } else {
 580                 talloc_steal(db, entry_ex->ctx);
 581         }
 582
 583         return ret;
 584 }
 585
 586 static krb5_error_code LDB_lookup_principal(krb5_context context, struct ldb_context *ldb_ctx,
 587                                             TALLOC_CTX *mem_ctx,
 588                                             krb5_const_principal principal,
 589                                             enum hdb_ldb_ent_type ent_type,
 590                                             struct ldb_dn *realm_dn,
 591                                             struct ldb_message ***pmsg)
 592 {
 593         krb5_error_code ret;
 594         int lret;
 595         char *filter = NULL;
 596         const char * const *princ_attrs = user_attrs;
 597
 598         char *short_princ;
 599         char *short_princ_talloc;
 600
 601         struct ldb_result *res = NULL;
 602
 603         ret = krb5_unparse_name_flags(context, principal,  KRB5_PRINCIPAL_UNPARSE_NO_REALM, &short_princ);
 604
 605         if (ret != 0) {
 606                 krb5_set_error_string(context, "LDB_lookup_principal: could not parse principal");
 607                 krb5_warnx(context, "LDB_lookup_principal: could not parse principal");
 608                 return ret;
 609         }
 610
 611         short_princ_talloc = talloc_strdup(mem_ctx, short_princ);
 612         free(short_princ);
 613         if (!short_princ_talloc) {
 614                 krb5_set_error_string(context, "LDB_lookup_principal: talloc_strdup() failed!");
 615                 return ENOMEM;
 616         }
 617
 618         switch (ent_type) {
 619         case HDB_LDB_ENT_TYPE_CLIENT:
 620                 /* Can't happen */
 621                 return EINVAL;
 622         case HDB_LDB_ENT_TYPE_ANY:
 623                 /* Can't happen */
 624                 return EINVAL;
 625         case HDB_LDB_ENT_TYPE_KRBTGT:
 626                 filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(samAccountName=%s))",
 627                                          KRB5_TGS_NAME);
 628                 break;
 629         case HDB_LDB_ENT_TYPE_SERVER:
 630                 filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(samAccountName=%s))",
 631                                          short_princ_talloc);
 632                 break;
 633         }
 634
 635         if (!filter) {
 636                 krb5_set_error_string(context, "talloc_asprintf: out of memory");
 637                 return ENOMEM;
 638         }
 639
 640         lret = ldb_search(ldb_ctx, realm_dn, LDB_SCOPE_SUBTREE, filter, princ_attrs, &res);
 641
 642         if (lret != LDB_SUCCESS) {
 643                 DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx)));
 644                 return HDB_ERR_NOENTRY;
 645         } else if (res->count == 0 || res->count > 1) {
 646                 DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count));
 647                 talloc_free(res);
 648                 return HDB_ERR_NOENTRY;
 649         }
 650         talloc_steal(mem_ctx, res->msgs);
 651         *pmsg = res->msgs;
 652         talloc_free(res);
 653         return 0;
 654 }
 655
 656 static krb5_error_code LDB_lookup_realm(krb5_context context, struct ldb_context *ldb_ctx,
 657                                         TALLOC_CTX *mem_ctx,
 658                                         const char *realm,
 659                                         struct ldb_message ***pmsg)
 660 {
 661         int ret;
 662         struct ldb_result *cross_ref_res;
 663         struct ldb_dn *partitions_basedn = samdb_partitions_dn(ldb_ctx, mem_ctx);
 664
 665         ret = ldb_search_exp_fmt(ldb_ctx, mem_ctx, &cross_ref_res,
 666                         partitions_basedn, LDB_SCOPE_SUBTREE, realm_ref_attrs,
 667                         "(&(&(|(&(dnsRoot=%s)(nETBIOSName=*))(nETBIOSName=%s))(objectclass=crossRef))(ncName=*))",
 668                         realm, realm);
 669
 670         if (ret != LDB_SUCCESS) {
 671                 DEBUG(3, ("Failed to search to lookup realm(%s): %s\n", realm, ldb_errstring(ldb_ctx)));
 672                 talloc_free(cross_ref_res);
 673                 return HDB_ERR_NOENTRY;
 674         } else if (cross_ref_res->count == 0 || cross_ref_res->count > 1) {
 675                 DEBUG(3, ("Failed find a single entry for realm %s: got %d\n", realm, cross_ref_res->count));
 676                 talloc_free(cross_ref_res);
 677                 return HDB_ERR_NOENTRY;
 678         }
 679
 680         if (pmsg) {
 681                 *pmsg = cross_ref_res->msgs;
 682                 talloc_steal(mem_ctx, cross_ref_res->msgs);
 683         }
 684         talloc_free(cross_ref_res);
 685
 686         return 0;
 687 }
 688
 689
 690 static krb5_error_code LDB_open(krb5_context context, HDB *db, int flags, mode_t mode)
 691 {
 692         if (db->hdb_master_key_set) {
 693                 krb5_warnx(context, "LDB_open: use of a master key incompatible with LDB\n");
 694                 krb5_set_error_string(context, "LDB_open: use of a master key incompatible with LDB\n");
 695                 return HDB_ERR_NOENTRY;
 696         }
 697
 698         return 0;
 699 }
 700
 701 static krb5_error_code LDB_close(krb5_context context, HDB *db)
 702 {
 703         return 0;
 704 }
 705
 706 static krb5_error_code LDB_lock(krb5_context context, HDB *db, int operation)
 707 {
 708         return 0;
 709 }
 710
 711 static krb5_error_code LDB_unlock(krb5_context context, HDB *db)
 712 {
 713         return 0;
 714 }
 715
 716 static krb5_error_code LDB_rename(krb5_context context, HDB *db, const char *new_name)
 717 {
 718         return HDB_ERR_DB_INUSE;
 719 }
 720
 721 static krb5_error_code LDB_fetch_client(krb5_context context, HDB *db,
 722                                         TALLOC_CTX *mem_ctx,
 723                                         krb5_const_principal principal,
 724                                         unsigned flags,
 725                                         hdb_entry_ex *entry_ex) {
 726         NTSTATUS nt_status;
 727         char *principal_string;
 728         krb5_error_code ret;
 729         struct ldb_message **msg = NULL;
 730         struct ldb_message **realm_ref_msg = NULL;
 731
 732         ret = krb5_unparse_name(context, principal, &principal_string);
 733
 734         if (ret != 0) {
 735                 return ret;
 736         }
 737
 738         nt_status = sam_get_results_principal((struct ldb_context *)db->hdb_db,
 739                                               mem_ctx, principal_string,
 740                                               &msg, &realm_ref_msg);
 741         free(principal_string);
 742         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
 743                 return HDB_ERR_NOENTRY;
 744         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
 745                 return ENOMEM;
 746         } else if (!NT_STATUS_IS_OK(nt_status)) {
 747                 return EINVAL;
 748         }
 749
 750         ret = LDB_message2entry(context, db, mem_ctx,
 751                                 principal, HDB_LDB_ENT_TYPE_CLIENT,
 752                                 msg[0], realm_ref_msg[0], entry_ex);
 753         return ret;
 754 }
 755
 756 static krb5_error_code LDB_fetch_krbtgt(krb5_context context, HDB *db,
 757                                         TALLOC_CTX *mem_ctx,
 758                                         krb5_const_principal principal,
 759                                         unsigned flags,
 760                                         hdb_entry_ex *entry_ex)
 761 {
 762         krb5_error_code ret;
 763         struct ldb_message **msg = NULL;
 764         struct ldb_message **realm_ref_msg = NULL;
 765         struct ldb_dn *realm_dn;
 766
 767         krb5_principal alloc_principal = NULL;
 768         if (principal->name.name_string.len != 2
 769             || (strcmp(principal->name.name_string.val[0], KRB5_TGS_NAME) != 0)) {
 770                 /* Not a krbtgt */
 771                 return HDB_ERR_NOENTRY;
 772         }
 773
 774         /* krbtgt case.  Either us or a trusted realm */
 775         if ((LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db,
 776                               mem_ctx, principal->name.name_string.val[1], &realm_ref_msg) == 0)) {
 777                 /* us */
 778                 /* Cludge, cludge cludge.  If the realm part of krbtgt/realm,
 779                  * is in our db, then direct the caller at our primary
 780                  * krgtgt */
 781
 782                 const char *dnsdomain = ldb_msg_find_attr_as_string(realm_ref_msg[0], "dnsRoot", NULL);
 783                 char *realm_fixed = strupper_talloc(mem_ctx, dnsdomain);
 784                 if (!realm_fixed) {
 785                         krb5_set_error_string(context, "strupper_talloc: out of memory");
 786                         return ENOMEM;
 787                 }
 788
 789                 ret = krb5_copy_principal(context, principal, &alloc_principal);
 790                 if (ret) {
 791                         return ret;
 792                 }
 793
 794                 free(alloc_principal->name.name_string.val[1]);
 795                 alloc_principal->name.name_string.val[1] = strdup(realm_fixed);
 796                 talloc_free(realm_fixed);
 797                 if (!alloc_principal->name.name_string.val[1]) {
 798                         krb5_set_error_string(context, "LDB_fetch: strdup() failed!");
 799                         return ENOMEM;
 800                 }
 801                 principal = alloc_principal;
 802                 realm_dn = samdb_result_dn((struct ldb_context *)db->hdb_db, mem_ctx, realm_ref_msg[0], "nCName", NULL);
 803         } else {
 804                 /* we should lookup trusted domains */
 805                 return HDB_ERR_NOENTRY;
 806         }
 807
 808         realm_dn = samdb_result_dn((struct ldb_context *)db->hdb_db, mem_ctx, realm_ref_msg[0], "nCName", NULL);
 809
 810         ret = LDB_lookup_principal(context, (struct ldb_context *)db->hdb_db,
 811                                    mem_ctx,
 812                                    principal, HDB_LDB_ENT_TYPE_KRBTGT, realm_dn, &msg);
 813
 814         if (ret != 0) {
 815                 krb5_warnx(context, "LDB_fetch: could not find principal in DB");
 816                 krb5_set_error_string(context, "LDB_fetch: could not find principal in DB");
 817                 return ret;
 818         }
 819
 820         ret = LDB_message2entry(context, db, mem_ctx,
 821                                 principal, HDB_LDB_ENT_TYPE_KRBTGT,
 822                                 msg[0], realm_ref_msg[0], entry_ex);
 823         if (ret != 0) {
 824                 krb5_warnx(context, "LDB_fetch: message2entry failed");
 825         }
 826         return ret;
 827 }
 828
 829 static krb5_error_code LDB_fetch_server(krb5_context context, HDB *db,
 830                                         TALLOC_CTX *mem_ctx,
 831                                         krb5_const_principal principal,
 832                                         unsigned flags,
 833                                         hdb_entry_ex *entry_ex)
 834 {
 835         krb5_error_code ret;
 836         const char *realm;
 837         struct ldb_message **msg = NULL;
 838         struct ldb_message **realm_ref_msg = NULL;
 839         struct ldb_dn *partitions_basedn = samdb_partitions_dn(db->hdb_db, mem_ctx);
 840         if (principal->name.name_string.len >= 2) {
 841                 /* 'normal server' case */
 842                 int ldb_ret;
 843                 NTSTATUS nt_status;
 844                 struct ldb_dn *user_dn, *domain_dn;
 845                 char *principal_string;
 846
 847                 ret = krb5_unparse_name_flags(context, principal,
 848                                               KRB5_PRINCIPAL_UNPARSE_NO_REALM,
 849                                               &principal_string);
 850                 if (ret != 0) {
 851                         return ret;
 852                 }
 853
 854                 /* At this point we may find the host is known to be
 855                  * in a different realm, so we should generate a
 856                  * referral instead */
 857                 nt_status = crack_service_principal_name((struct ldb_context *)db->hdb_db,
 858                                                          mem_ctx, principal_string,
 859                                                          &user_dn, &domain_dn);
 860                 free(principal_string);
 861
 862                 if (!NT_STATUS_IS_OK(nt_status)) {
 863                         return HDB_ERR_NOENTRY;
 864                 }
 865
 866                 ldb_ret = gendb_search_dn((struct ldb_context *)db->hdb_db,
 867                                           mem_ctx, user_dn, &msg, user_attrs);
 868
 869                 if (ldb_ret != 1) {
 870                         return HDB_ERR_NOENTRY;
 871                 }
 872
 873                 ldb_ret = gendb_search((struct ldb_context *)db->hdb_db,
 874                                        mem_ctx, partitions_basedn, &realm_ref_msg, realm_ref_attrs,
 875                                        "ncName=%s", ldb_dn_get_linearized(domain_dn));
 876
 877                 if (ldb_ret != 1) {
 878                         return HDB_ERR_NOENTRY;
 879                 }
 880
 881         } else {
 882                 struct ldb_dn *realm_dn;
 883                 /* server as client principal case, but we must not lookup userPrincipalNames */
 884
 885                 realm = krb5_principal_get_realm(context, principal);
 886
 887                 ret = LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db,
 888                                        mem_ctx, realm, &realm_ref_msg);
 889                 if (ret != 0) {
 890                         return HDB_ERR_NOENTRY;
 891                 }
 892
 893                 realm_dn = samdb_result_dn((struct ldb_context *)db->hdb_db, mem_ctx, realm_ref_msg[0], "nCName", NULL);
 894
 895                 ret = LDB_lookup_principal(context, (struct ldb_context *)db->hdb_db,
 896                                            mem_ctx,
 897                                            principal, HDB_LDB_ENT_TYPE_SERVER, realm_dn, &msg);
 898
 899                 if (ret != 0) {
 900                         return ret;
 901                 }
 902         }
 903
 904         ret = LDB_message2entry(context, db, mem_ctx,
 905                                 principal, HDB_LDB_ENT_TYPE_SERVER,
 906                                 msg[0], realm_ref_msg[0], entry_ex);
 907         if (ret != 0) {
 908                 krb5_warnx(context, "LDB_fetch: message2entry failed");
 909         }
 910
 911         return ret;
 912 }
 913
 914 static krb5_error_code LDB_fetch(krb5_context context, HDB *db,
 915                                  krb5_const_principal principal,
 916                                  unsigned flags,
 917                                  hdb_entry_ex *entry_ex)
 918 {
 919         krb5_error_code ret = HDB_ERR_NOENTRY;
 920
 921         TALLOC_CTX *mem_ctx = talloc_named(db, 0, "LDB_fetch context");
 922
 923         if (!mem_ctx) {
 924                 krb5_set_error_string(context, "LDB_fetch: talloc_named() failed!");
 925                 return ENOMEM;
 926         }
 927
 928         if (flags & HDB_F_GET_CLIENT) {
 929                 ret = LDB_fetch_client(context, db, mem_ctx, principal, flags, entry_ex);
 930                 if (ret != HDB_ERR_NOENTRY) goto done;
 931         }
 932         if (flags & HDB_F_GET_SERVER) {
 933                 ret = LDB_fetch_server(context, db, mem_ctx, principal, flags, entry_ex);
 934                 if (ret != HDB_ERR_NOENTRY) goto done;
 935                 ret = LDB_fetch_krbtgt(context, db, mem_ctx, principal, flags, entry_ex);
 936                 if (ret != HDB_ERR_NOENTRY) goto done;
 937         }
 938         if (flags & HDB_F_GET_KRBTGT) {
 939                 ret = LDB_fetch_krbtgt(context, db, mem_ctx, principal, flags, entry_ex);
 940                 if (ret != HDB_ERR_NOENTRY) goto done;
 941         }
 942
 943 done:
 944         talloc_free(mem_ctx);
 945         return ret;
 946 }
 947
 948 static krb5_error_code LDB_store(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 949 {
 950         return HDB_ERR_DB_INUSE;
 951 }
 952
 953 static krb5_error_code LDB_remove(krb5_context context, HDB *db, krb5_const_principal principal)
 954 {
 955         return HDB_ERR_DB_INUSE;
 956 }
 957
 958 struct hdb_ldb_seq {
 959         struct ldb_context *ctx;
 960         int index;
 961         int count;
 962         struct ldb_message **msgs;
 963         struct ldb_message **realm_ref_msgs;
 964 };
 965
 966 static krb5_error_code LDB_seq(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 967 {
 968         krb5_error_code ret;
 969         struct hdb_ldb_seq *priv = (struct hdb_ldb_seq *)db->hdb_dbc;
 970         TALLOC_CTX *mem_ctx;
 971         hdb_entry_ex entry_ex;
 972         memset(&entry_ex, '\0', sizeof(entry_ex));
 973
 974         if (!priv) {
 975                 return HDB_ERR_NOENTRY;
 976         }
 977
 978         mem_ctx = talloc_named(priv, 0, "LDB_seq context");
 979
 980         if (!mem_ctx) {
 981                 krb5_set_error_string(context, "LDB_seq: talloc_named() failed!");
 982                 return ENOMEM;
 983         }
 984
 985         if (priv->index < priv->count) {
 986                 ret = LDB_message2entry(context, db, mem_ctx,
 987                                         NULL, HDB_LDB_ENT_TYPE_ANY,
 988                                         priv->msgs[priv->index++],
 989                                         priv->realm_ref_msgs[0], entry);
 990         } else {
 991                 ret = HDB_ERR_NOENTRY;
 992         }
 993
 994         if (ret != 0) {
 995                 talloc_free(priv);
 996                 db->hdb_dbc = NULL;
 997         } else {
 998                 talloc_free(mem_ctx);
 999         }
1000
1001         return ret;
1002 }
1003
1004 static krb5_error_code LDB_firstkey(krb5_context context, HDB *db, unsigned flags,
1005                                         hdb_entry_ex *entry)
1006 {
1007         struct ldb_context *ldb_ctx = (struct ldb_context *)db->hdb_db;
1008         struct hdb_ldb_seq *priv = (struct hdb_ldb_seq *)db->hdb_dbc;
1009         char *realm;
1010         struct ldb_dn *realm_dn = NULL;
1011         struct ldb_result *res = NULL;
1012         struct ldb_message **realm_ref_msgs = NULL;
1013         krb5_error_code ret;
1014         TALLOC_CTX *mem_ctx;
1015         int lret;
1016
1017         if (priv) {
1018                 talloc_free(priv);
1019                 db->hdb_dbc = NULL;
1020         }
1021
1022         priv = (struct hdb_ldb_seq *) talloc(db, struct hdb_ldb_seq);
1023         if (!priv) {
1024                 krb5_set_error_string(context, "talloc: out of memory");
1025                 return ENOMEM;
1026         }
1027
1028         priv->ctx = ldb_ctx;
1029         priv->index = 0;
1030         priv->msgs = NULL;
1031         priv->realm_ref_msgs = NULL;
1032         priv->count = 0;
1033
1034         mem_ctx = talloc_named(priv, 0, "LDB_firstkey context");
1035
1036         if (!mem_ctx) {
1037                 krb5_set_error_string(context, "LDB_firstkey: talloc_named() failed!");
1038                 return ENOMEM;
1039         }
1040
1041         ret = krb5_get_default_realm(context, &realm);
1042         if (ret != 0) {
1043                 talloc_free(priv);
1044                 return ret;
1045         }
1046
1047         ret = LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db,
1048                                mem_ctx, realm, &realm_ref_msgs);
1049
1050         free(realm);
1051
1052         if (ret != 0) {
1053                 talloc_free(priv);
1054                 krb5_warnx(context, "LDB_firstkey: could not find realm\n");
1055                 return HDB_ERR_NOENTRY;
1056         }
1057
1058         realm_dn = samdb_result_dn((struct ldb_context *)db->hdb_db, mem_ctx, realm_ref_msgs[0], "nCName", NULL);
1059
1060         priv->realm_ref_msgs = talloc_steal(priv, realm_ref_msgs);
1061
1062         lret = ldb_search(ldb_ctx, realm_dn,
1063                                  LDB_SCOPE_SUBTREE, "(objectClass=user)",
1064                                  user_attrs, &res);
1065
1066         if (lret != LDB_SUCCESS) {
1067                 talloc_free(priv);
1068                 return HDB_ERR_NOENTRY;
1069         }
1070
1071         priv->count = res->count;
1072         priv->msgs = talloc_steal(priv, res->msgs);
1073         talloc_free(res);
1074
1075         db->hdb_dbc = priv;
1076
1077         ret = LDB_seq(context, db, flags, entry);
1078
1079         if (ret != 0) {
1080                 talloc_free(priv);
1081                 db->hdb_dbc = NULL;
1082         } else {
1083                 talloc_free(mem_ctx);
1084         }
1085         return ret;
1086 }
1087
1088 static krb5_error_code LDB_nextkey(krb5_context context, HDB *db, unsigned flags,
1089                                    hdb_entry_ex *entry)
1090 {
1091         return LDB_seq(context, db, flags, entry);
1092 }
1093
1094 static krb5_error_code LDB_destroy(krb5_context context, HDB *db)
1095 {
1096         talloc_free(db);
1097         return 0;
1098 }
1099
1100 /* This interface is to be called by the KDC, which is expecting Samba
1101  * calling conventions.  It is also called by a wrapper
1102  * (hdb_ldb_create) from the kpasswdd -> krb5 -> keytab_hdb -> hdb
1103  * code */
1104
1105 NTSTATUS kdc_hdb_ldb_create(TALLOC_CTX *mem_ctx,
1106                             struct loadparm_context *lp_ctx,
1107                             krb5_context context, struct HDB **db, const char *arg)
1108 {
1109         NTSTATUS nt_status;
1110         struct auth_session_info *session_info;
1111         *db = talloc(mem_ctx, HDB);
1112         if (!*db) {
1113                 krb5_set_error_string(context, "malloc: out of memory");
1114                 return NT_STATUS_NO_MEMORY;
1115         }
1116
1117         (*db)->hdb_master_key_set = 0;
1118         (*db)->hdb_db = NULL;
1119
1120         nt_status = auth_system_session_info(*db, lp_ctx, &session_info);
1121         if (!NT_STATUS_IS_OK(nt_status)) {
1122                 return nt_status;
1123         }
1124
1125         /* The idea here is very simple.  Using Kerberos to
1126          * authenticate the KDC to the LDAP server is higly likely to
1127          * be circular.
1128          *
1129          * In future we may set this up to use EXERNAL and SSL
1130          * certificates, for now it will almost certainly be NTLMSSP
1131         */
1132
1133         cli_credentials_set_kerberos_state(session_info->credentials,
1134                                            CRED_DONT_USE_KERBEROS);
1135
1136         /* Setup the link to LDB */
1137         (*db)->hdb_db = samdb_connect(*db, lp_ctx, session_info);
1138         if ((*db)->hdb_db == NULL) {
1139                 DEBUG(1, ("hdb_ldb_create: Cannot open samdb for KDC backend!"));
1140                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1141         }
1142
1143         (*db)->hdb_dbc = NULL;
1144         (*db)->hdb_open = LDB_open;
1145         (*db)->hdb_close = LDB_close;
1146         (*db)->hdb_fetch = LDB_fetch;
1147         (*db)->hdb_store = LDB_store;
1148         (*db)->hdb_remove = LDB_remove;
1149         (*db)->hdb_firstkey = LDB_firstkey;
1150         (*db)->hdb_nextkey = LDB_nextkey;
1151         (*db)->hdb_lock = LDB_lock;
1152         (*db)->hdb_unlock = LDB_unlock;
1153         (*db)->hdb_rename = LDB_rename;
1154         /* we don't implement these, as we are not a lockable database */
1155         (*db)->hdb__get = NULL;
1156         (*db)->hdb__put = NULL;
1157         /* kadmin should not be used for deletes - use other tools instead */
1158         (*db)->hdb__del = NULL;
1159         (*db)->hdb_destroy = LDB_destroy;
1160
1161         return NT_STATUS_OK;
1162 }
1163
1164 krb5_error_code hdb_ldb_create(krb5_context context, struct HDB **db, const char *arg)
1165 {
1166         NTSTATUS nt_status;
1167         /* The global kdc_mem_ctx, Disgusting, ugly hack, but it means one less private hook */
1168         nt_status = kdc_hdb_ldb_create(kdc_mem_ctx, global_loadparm,
1169                                        context, db, arg);
1170
1171         if (NT_STATUS_IS_OK(nt_status)) {
1172                 return 0;
1173         }
1174         return EINVAL;
1175 }