source4/kdc/db-glue.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Database Glue between Samba and the KDC
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2009
   7    Copyright (C) Simo Sorce <idra@samba.org> 2010
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "system/time.h"
  26 #include "../libds/common/flags.h"
  27 #include "lib/ldb/include/ldb.h"
  28 #include "librpc/gen_ndr/netlogon.h"
  29 #include "libcli/security/security.h"
  30 #include "auth/auth.h"
  31 #include "auth/credentials/credentials.h"
  32 #include "auth/auth_sam.h"
  33 #include "../lib/util/util_ldb.h"
  34 #include "dsdb/samdb/samdb.h"
  35 #include "dsdb/common/util.h"
  36 #include "librpc/ndr/libndr.h"
  37 #include "librpc/gen_ndr/ndr_drsblobs.h"
  38 #include "librpc/gen_ndr/lsa.h"
  39 #include "libcli/auth/libcli_auth.h"
  40 #include "param/param.h"
  41 #include "../lib/crypto/md4.h"
  42 #include "system/kerberos.h"
  43 #include "auth/kerberos/kerberos.h"
  44 #include <hdb.h>
  45 #include "kdc/samba_kdc.h"
  46 #include "kdc/db-glue.h"
  47
  48 enum samba_kdc_ent_type
  49 { SAMBA_KDC_ENT_TYPE_CLIENT, SAMBA_KDC_ENT_TYPE_SERVER,
  50   SAMBA_KDC_ENT_TYPE_KRBTGT, SAMBA_KDC_ENT_TYPE_TRUST, SAMBA_KDC_ENT_TYPE_ANY };
  51
  52 enum trust_direction {
  53         UNKNOWN = 0,
  54         INBOUND = LSA_TRUST_DIRECTION_INBOUND,
  55         OUTBOUND = LSA_TRUST_DIRECTION_OUTBOUND
  56 };
  57
  58 static const char *trust_attrs[] = {
  59         "trustPartner",
  60         "trustAuthIncoming",
  61         "trustAuthOutgoing",
  62         "whenCreated",
  63         "msDS-SupportedEncryptionTypes",
  64         "trustAttributes",
  65         "trustDirection",
  66         "trustType",
  67         NULL
  68 };
  69
  70 static KerberosTime ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, KerberosTime default_val)
  71 {
  72     const char *tmp;
  73     const char *gentime;
  74     struct tm tm;
  75
  76     gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
  77     if (!gentime)
  78         return default_val;
  79
  80     tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
  81     if (tmp == NULL) {
  82             return default_val;
  83     }
  84
  85     return timegm(&tm);
  86 }
  87
  88 static HDBFlags uf2HDBFlags(krb5_context context, int userAccountControl, enum samba_kdc_ent_type ent_type)
  89 {
  90         HDBFlags flags = int2HDBFlags(0);
  91
  92         /* we don't allow kadmin deletes */
  93         flags.immutable = 1;
  94
  95         /* mark the principal as invalid to start with */
  96         flags.invalid = 1;
  97
  98         flags.renewable = 1;
  99
 100         /* All accounts are servers, but this may be disabled again in the caller */
 101         flags.server = 1;
 102
 103         /* Account types - clear the invalid bit if it turns out to be valid */
 104         if (userAccountControl & UF_NORMAL_ACCOUNT) {
 105                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
 106                         flags.client = 1;
 107                 }
 108                 flags.invalid = 0;
 109         }
 110
 111         if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
 112                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
 113                         flags.client = 1;
 114                 }
 115                 flags.invalid = 0;
 116         }
 117         if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
 118                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
 119                         flags.client = 1;
 120                 }
 121                 flags.invalid = 0;
 122         }
 123         if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
 124                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
 125                         flags.client = 1;
 126                 }
 127                 flags.invalid = 0;
 128         }
 129
 130         /* Not permitted to act as a client if disabled */
 131         if (userAccountControl & UF_ACCOUNTDISABLE) {
 132                 flags.client = 0;
 133         }
 134         if (userAccountControl & UF_LOCKOUT) {
 135                 flags.invalid = 1;
 136         }
 137 /*
 138         if (userAccountControl & UF_PASSWORD_NOTREQD) {
 139                 flags.invalid = 1;
 140         }
 141 */
 142 /*
 143         UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
 144 */
 145         if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
 146                 flags.invalid = 1;
 147         }
 148
 149 /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in samba_kdc_message2entry() */
 150
 151 /*
 152         if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
 153                 flags.invalid = 1;
 154         }
 155 */
 156         if (userAccountControl & UF_SMARTCARD_REQUIRED) {
 157                 flags.require_hwauth = 1;
 158         }
 159         if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
 160                 flags.ok_as_delegate = 1;
 161         }
 162         if (!(userAccountControl & UF_NOT_DELEGATED)) {
 163                 flags.forwardable = 1;
 164                 flags.proxiable = 1;
 165         }
 166
 167         if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
 168                 flags.require_preauth = 0;
 169         } else {
 170                 flags.require_preauth = 1;
 171
 172         }
 173         return flags;
 174 }
 175
 176 static int samba_kdc_entry_destructor(struct samba_kdc_entry *p)
 177 {
 178     hdb_entry_ex *entry_ex = p->entry_ex;
 179     free_hdb_entry(&entry_ex->entry);
 180     return 0;
 181 }
 182
 183 static void samba_kdc_free_entry(krb5_context context, hdb_entry_ex *entry_ex)
 184 {
 185         /* this function is called only from hdb_free_entry().
 186          * Make sure we neutralize the destructor or we will
 187          * get a double free later when hdb_free_entry() will
 188          * try to call free_hdb_entry() */
 189         talloc_set_destructor(entry_ex->ctx, NULL);
 190
 191         /* now proceed to free the talloc part */
 192         talloc_free(entry_ex->ctx);
 193 }
 194
 195 static krb5_error_code samba_kdc_message2entry_keys(krb5_context context,
 196                                                     TALLOC_CTX *mem_ctx,
 197                                                     struct ldb_message *msg,
 198                                                     uint32_t rid,
 199                                                     bool is_rodc,
 200                                                     unsigned int userAccountControl,
 201                                                     enum samba_kdc_ent_type ent_type,
 202                                                     hdb_entry_ex *entry_ex)
 203 {
 204         krb5_error_code ret = 0;
 205         enum ndr_err_code ndr_err;
 206         struct samr_Password *hash;
 207         const struct ldb_val *sc_val;
 208         struct supplementalCredentialsBlob scb;
 209         struct supplementalCredentialsPackage *scpk = NULL;
 210         bool newer_keys = false;
 211         struct package_PrimaryKerberosBlob _pkb;
 212         struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
 213         struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
 214         uint16_t i;
 215         uint16_t allocated_keys = 0;
 216         int rodc_krbtgt_number = 0;
 217         uint32_t supported_enctypes;
 218
 219         if (rid == DOMAIN_RID_KRBTGT || is_rodc) {
 220                 /* KDCs (and KDCs on RODCs) use AES, but not DES */
 221                 supported_enctypes = ENC_ALL_TYPES;
 222                 supported_enctypes &= ~(ENC_CRC32|ENC_RSA_MD5);
 223         } else if (userAccountControl & (UF_PARTIAL_SECRETS_ACCOUNT|UF_SERVER_TRUST_ACCOUNT)) {
 224                 /* DCs and RODCs comptuer accounts use AES */
 225                 supported_enctypes = ENC_ALL_TYPES;
 226         } else if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT ||
 227                    (ent_type == SAMBA_KDC_ENT_TYPE_ANY)) {
 228                 /* for AS-REQ the client chooses the enc types it
 229                  * supports, and this will vary between computers a
 230                  * user logs in from.  However, some accounts may be
 231                  * banned from using DES, so allow the default to be
 232                  * overridden
 233                  *
 234                  * likewise for 'any' return as much as is supported,
 235                  * to export into a keytab */
 236                 supported_enctypes = ldb_msg_find_attr_as_uint(msg, "msDS-SupportedEncryptionTypes",
 237                                                                ENC_ALL_TYPES);
 238         } else {
 239                 /* However, if this is a TGS-REQ, then lock it down to
 240                  * a reasonable guess as to what the server can decode
 241                  * - we must use whatever is in
 242                  * "msDS-SupportedEncryptionTypes", or the 'old' set
 243                  * of keys (ie, what Windows 2000 supported) */
 244                 supported_enctypes = ldb_msg_find_attr_as_uint(msg, "msDS-SupportedEncryptionTypes",
 245                                                                ENC_CRC32 | ENC_RSA_MD5 | ENC_RC4_HMAC_MD5);
 246         }
 247
 248         /* Is this the krbtgt or a RODC krbtgt */
 249         if (is_rodc) {
 250                 rodc_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
 251
 252                 if (rodc_krbtgt_number == -1) {
 253                         return EINVAL;
 254                 }
 255         }
 256
 257
 258         /* If UF_USE_DES_KEY_ONLY has been set, then don't allow use of the newer enc types */
 259         if (userAccountControl & UF_USE_DES_KEY_ONLY) {
 260                 /* However, this still won't allow use of DES, if we
 261                  * were told not to by msDS-SupportedEncTypes */
 262                 supported_enctypes &= ENC_CRC32|ENC_RSA_MD5;
 263         } else {
 264                 switch (ent_type) {
 265                 case SAMBA_KDC_ENT_TYPE_KRBTGT:
 266                 case SAMBA_KDC_ENT_TYPE_TRUST:
 267                         /* Unless a very special effort it made,
 268                          * disallow trust tickets to be DES encrypted,
 269                          * it's just too dangerous */
 270                         supported_enctypes &= ~(ENC_CRC32|ENC_RSA_MD5);
 271                         break;
 272                 default:
 273                         break;
 274                         /* No further restrictions */
 275                 }
 276         }
 277
 278         entry_ex->entry.keys.val = NULL;
 279         entry_ex->entry.keys.len = 0;
 280
 281         entry_ex->entry.kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
 282         if (is_rodc) {
 283                 entry_ex->entry.kvno |= (rodc_krbtgt_number << 16);
 284         }
 285
 286         /* Get keys from the db */
 287
 288         hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
 289         sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
 290
 291         /* unicodePwd for enctype 0x17 (23) if present */
 292         if (hash) {
 293                 allocated_keys++;
 294         }
 295
 296         /* supplementalCredentials if present */
 297         if (sc_val) {
 298                 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, &scb,
 299                                                    (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
 300                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 301                         dump_data(0, sc_val->data, sc_val->length);
 302                         ret = EINVAL;
 303                         goto out;
 304                 }
 305
 306                 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
 307                         NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
 308                         ret = EINVAL;
 309                         goto out;
 310                 }
 311
 312                 for (i=0; i < scb.sub.num_packages; i++) {
 313                         if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
 314                                 scpk = &scb.sub.packages[i];
 315                                 if (!scpk->data || !scpk->data[0]) {
 316                                         scpk = NULL;
 317                                         continue;
 318                                 }
 319                                 newer_keys = true;
 320                                 break;
 321                         } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
 322                                 scpk = &scb.sub.packages[i];
 323                                 if (!scpk->data || !scpk->data[0]) {
 324                                         scpk = NULL;
 325                                 }
 326                                 /*
 327                                  * we don't break here in hope to find
 328                                  * a Kerberos-Newer-Keys package
 329                                  */
 330                         }
 331                 }
 332         }
 333         /*
 334          * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
 335          * of supplementalCredentials
 336          */
 337         if (scpk) {
 338                 DATA_BLOB blob;
 339
 340                 blob = strhex_to_data_blob(mem_ctx, scpk->data);
 341                 if (!blob.data) {
 342                         ret = ENOMEM;
 343                         goto out;
 344                 }
 345
 346                 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
 347                 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &_pkb,
 348                                                (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
 349                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 350                         ret = EINVAL;
 351                         krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 352                         krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 353                         goto out;
 354                 }
 355
 356                 if (newer_keys && _pkb.version != 4) {
 357                         ret = EINVAL;
 358                         krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 359                         krb5_warnx(context, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 360                         goto out;
 361                 }
 362
 363                 if (!newer_keys && _pkb.version != 3) {
 364                         ret = EINVAL;
 365                         krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
 366                         krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
 367                         goto out;
 368                 }
 369
 370                 if (_pkb.version == 4) {
 371                         pkb4 = &_pkb.ctr.ctr4;
 372                         allocated_keys += pkb4->num_keys;
 373                 } else if (_pkb.version == 3) {
 374                         pkb3 = &_pkb.ctr.ctr3;
 375                         allocated_keys += pkb3->num_keys;
 376                 }
 377         }
 378
 379         if (allocated_keys == 0) {
 380                 /* oh, no password.  Apparently (comment in
 381                  * hdb-ldap.c) this violates the ASN.1, but this
 382                  * allows an entry with no keys (yet). */
 383                 return 0;
 384         }
 385
 386         /* allocate space to decode into */
 387         entry_ex->entry.keys.len = 0;
 388         entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(Key));
 389         if (entry_ex->entry.keys.val == NULL) {
 390                 ret = ENOMEM;
 391                 goto out;
 392         }
 393
 394         if (hash && (supported_enctypes & ENC_RC4_HMAC_MD5)) {
 395                 Key key;
 396
 397                 key.mkvno = 0;
 398                 key.salt = NULL; /* No salt for this enc type */
 399
 400                 ret = krb5_keyblock_init(context,
 401                                          ENCTYPE_ARCFOUR_HMAC,
 402                                          hash->hash, sizeof(hash->hash),
 403                                          &key.key);
 404                 if (ret) {
 405                         goto out;
 406                 }
 407
 408                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 409                 entry_ex->entry.keys.len++;
 410         }
 411
 412         if (pkb4) {
 413                 for (i=0; i < pkb4->num_keys; i++) {
 414                         Key key;
 415
 416                         if (!pkb4->keys[i].value) continue;
 417
 418                         if (!(kerberos_enctype_to_bitmap(pkb4->keys[i].keytype) & supported_enctypes)) {
 419                                 continue;
 420                         }
 421
 422                         key.mkvno = 0;
 423                         key.salt = NULL;
 424
 425                         if (pkb4->salt.string) {
 426                                 DATA_BLOB salt;
 427
 428                                 salt = data_blob_string_const(pkb4->salt.string);
 429
 430                                 key.salt = calloc(1, sizeof(*key.salt));
 431                                 if (key.salt == NULL) {
 432                                         ret = ENOMEM;
 433                                         goto out;
 434                                 }
 435
 436                                 key.salt->type = hdb_pw_salt;
 437
 438                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
 439                                 if (ret) {
 440                                         free(key.salt);
 441                                         key.salt = NULL;
 442                                         goto out;
 443                                 }
 444                         }
 445
 446                         /* TODO: maybe pass the iteration_count somehow... */
 447
 448                         ret = krb5_keyblock_init(context,
 449                                                  pkb4->keys[i].keytype,
 450                                                  pkb4->keys[i].value->data,
 451                                                  pkb4->keys[i].value->length,
 452                                                  &key.key);
 453                         if (ret == KRB5_PROG_ETYPE_NOSUPP) {
 454                                 DEBUG(2,("Unsupported keytype ignored - type %u\n",
 455                                          pkb4->keys[i].keytype));
 456                                 ret = 0;
 457                                 continue;
 458                         }
 459                         if (ret) {
 460                                 if (key.salt) {
 461                                         free_Salt(key.salt);
 462                                         free(key.salt);
 463                                         key.salt = NULL;
 464                                 }
 465                                 goto out;
 466                         }
 467
 468                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 469                         entry_ex->entry.keys.len++;
 470                 }
 471         } else if (pkb3) {
 472                 for (i=0; i < pkb3->num_keys; i++) {
 473                         Key key;
 474
 475                         if (!pkb3->keys[i].value) continue;
 476
 477                         if (!(kerberos_enctype_to_bitmap(pkb3->keys[i].keytype) & supported_enctypes)) {
 478                                 continue;
 479                         }
 480
 481                         key.mkvno = 0;
 482                         key.salt = NULL;
 483
 484                         if (pkb3->salt.string) {
 485                                 DATA_BLOB salt;
 486
 487                                 salt = data_blob_string_const(pkb3->salt.string);
 488
 489                                 key.salt = calloc(1, sizeof(*key.salt));
 490                                 if (key.salt == NULL) {
 491                                         ret = ENOMEM;
 492                                         goto out;
 493                                 }
 494
 495                                 key.salt->type = hdb_pw_salt;
 496
 497                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
 498                                 if (ret) {
 499                                         free(key.salt);
 500                                         key.salt = NULL;
 501                                         goto out;
 502                                 }
 503                         }
 504
 505                         ret = krb5_keyblock_init(context,
 506                                                  pkb3->keys[i].keytype,
 507                                                  pkb3->keys[i].value->data,
 508                                                  pkb3->keys[i].value->length,
 509                                                  &key.key);
 510                         if (ret) {
 511                                 if (key.salt) {
 512                                         free_Salt(key.salt);
 513                                         free(key.salt);
 514                                         key.salt = NULL;
 515                                 }
 516                                 goto out;
 517                         }
 518
 519                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 520                         entry_ex->entry.keys.len++;
 521                 }
 522         }
 523
 524 out:
 525         if (ret != 0) {
 526                 entry_ex->entry.keys.len = 0;
 527         }
 528         if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
 529                 free(entry_ex->entry.keys.val);
 530                 entry_ex->entry.keys.val = NULL;
 531         }
 532         return ret;
 533 }
 534
 535 /*
 536  * Construct an hdb_entry from a directory entry.
 537  */
 538 static krb5_error_code samba_kdc_message2entry(krb5_context context,
 539                                          struct samba_kdc_db_context *kdc_db_ctx,
 540                                          TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 541                                          enum samba_kdc_ent_type ent_type,
 542                                          struct ldb_dn *realm_dn,
 543                                          struct ldb_message *msg,
 544                                          hdb_entry_ex *entry_ex)
 545 {
 546         struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
 547         unsigned int userAccountControl;
 548         unsigned int i;
 549         krb5_error_code ret = 0;
 550         krb5_boolean is_computer = FALSE;
 551         char *realm = strupper_talloc(mem_ctx, lpcfg_realm(lp_ctx));
 552
 553         struct samba_kdc_entry *p;
 554         NTTIME acct_expiry;
 555         NTSTATUS status;
 556
 557         uint32_t rid;
 558         bool is_rodc = false;
 559         struct ldb_message_element *objectclasses;
 560         struct ldb_val computer_val;
 561         const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
 562         computer_val.data = discard_const_p(uint8_t,"computer");
 563         computer_val.length = strlen((const char *)computer_val.data);
 564
 565         if (ldb_msg_find_element(msg, "msDS-SecondaryKrbTgtNumber")) {
 566                 is_rodc = true;
 567         }
 568
 569         if (!samAccountName) {
 570                 ret = ENOENT;
 571                 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no samAccountName present");
 572                 goto out;
 573         }
 574
 575         objectclasses = ldb_msg_find_element(msg, "objectClass");
 576
 577         if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
 578                 is_computer = TRUE;
 579         }
 580
 581         memset(entry_ex, 0, sizeof(*entry_ex));
 582
 583         if (!realm) {
 584                 ret = ENOMEM;
 585                 krb5_set_error_message(context, ret, "talloc_strdup: out of memory");
 586                 goto out;
 587         }
 588
 589         p = talloc(mem_ctx, struct samba_kdc_entry);
 590         if (!p) {
 591                 ret = ENOMEM;
 592                 goto out;
 593         }
 594
 595         p->kdc_db_ctx = kdc_db_ctx;
 596         p->entry_ex = entry_ex;
 597         p->realm_dn = talloc_reference(p, realm_dn);
 598         if (!p->realm_dn) {
 599                 ret = ENOMEM;
 600                 goto out;
 601         }
 602
 603         talloc_set_destructor(p, samba_kdc_entry_destructor);
 604
 605         /* make sure we do not have bogus data in there */
 606         memset(&entry_ex->entry, 0, sizeof(hdb_entry));
 607
 608         entry_ex->ctx = p;
 609         entry_ex->free_entry = samba_kdc_free_entry;
 610
 611         userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
 612
 613
 614         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 615         if (ent_type == SAMBA_KDC_ENT_TYPE_ANY && principal == NULL) {
 616                 krb5_make_principal(context, &entry_ex->entry.principal, realm, samAccountName, NULL);
 617         } else {
 618                 ret = copy_Principal(principal, entry_ex->entry.principal);
 619                 if (ret) {
 620                         krb5_clear_error_message(context);
 621                         goto out;
 622                 }
 623
 624                 /* While we have copied the client principal, tests
 625                  * show that Win2k3 returns the 'corrected' realm, not
 626                  * the client-specified realm.  This code attempts to
 627                  * replace the client principal's realm with the one
 628                  * we determine from our records */
 629
 630                 /* this has to be with malloc() */
 631                 krb5_principal_set_realm(context, entry_ex->entry.principal, realm);
 632         }
 633
 634         /* First try and figure out the flags based on the userAccountControl */
 635         entry_ex->entry.flags = uf2HDBFlags(context, userAccountControl, ent_type);
 636
 637         /* Windows 2008 seems to enforce this (very sensible) rule by
 638          * default - don't allow offline attacks on a user's password
 639          * by asking for a ticket to them as a service (encrypted with
 640          * their probably patheticly insecure password) */
 641
 642         if (entry_ex->entry.flags.server
 643             && lpcfg_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
 644                 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
 645                         entry_ex->entry.flags.server = 0;
 646                 }
 647         }
 648
 649         {
 650                 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
 651                  * of the Heimdal KDC.  They are stored in a the traditional
 652                  * DB for audit purposes, and still form part of the structure
 653                  * we must return */
 654
 655                 /* use 'whenCreated' */
 656                 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 657                 /* use 'kadmin' for now (needed by mit_samba) */
 658                 krb5_make_principal(context,
 659                                     &entry_ex->entry.created_by.principal,
 660                                     realm, "kadmin", NULL);
 661
 662                 entry_ex->entry.modified_by = (Event *) malloc(sizeof(Event));
 663                 if (entry_ex->entry.modified_by == NULL) {
 664                         ret = ENOMEM;
 665                         krb5_set_error_message(context, ret, "malloc: out of memory");
 666                         goto out;
 667                 }
 668
 669                 /* use 'whenChanged' */
 670                 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
 671                 /* use 'kadmin' for now (needed by mit_samba) */
 672                 krb5_make_principal(context,
 673                                     &entry_ex->entry.modified_by->principal,
 674                                     realm, "kadmin", NULL);
 675         }
 676
 677
 678         /* The lack of password controls etc applies to krbtgt by
 679          * virtue of being that particular RID */
 680         status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
 681
 682         if (!NT_STATUS_IS_OK(status)) {
 683                 ret = EINVAL;
 684                 goto out;
 685         }
 686
 687         if (rid == DOMAIN_RID_KRBTGT) {
 688                 entry_ex->entry.valid_end = NULL;
 689                 entry_ex->entry.pw_end = NULL;
 690
 691                 entry_ex->entry.flags.invalid = 0;
 692                 entry_ex->entry.flags.server = 1;
 693
 694                 /* Don't mark all requests for the krbtgt/realm as
 695                  * 'change password', as otherwise we could get into
 696                  * trouble, and not enforce the password expirty.
 697                  * Instead, only do it when request is for the kpasswd service */
 698                 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER
 699                     && principal->name.name_string.len == 2
 700                     && (strcmp(principal->name.name_string.val[0], "kadmin") == 0)
 701                     && (strcmp(principal->name.name_string.val[1], "changepw") == 0)
 702                     && lpcfg_is_my_domain_or_realm(lp_ctx, principal->realm)) {
 703                         entry_ex->entry.flags.change_pw = 1;
 704                 }
 705                 entry_ex->entry.flags.client = 0;
 706                 entry_ex->entry.flags.forwardable = 1;
 707                 entry_ex->entry.flags.ok_as_delegate = 1;
 708         } else if (is_rodc) {
 709                 /* The RODC krbtgt account is like the main krbtgt,
 710                  * but it does not have a changepw or kadmin
 711                  * service */
 712
 713                 entry_ex->entry.valid_end = NULL;
 714                 entry_ex->entry.pw_end = NULL;
 715
 716                 /* Also don't allow the RODC krbtgt to be a client (it should not be needed) */
 717                 entry_ex->entry.flags.client = 0;
 718                 entry_ex->entry.flags.invalid = 0;
 719                 entry_ex->entry.flags.server = 1;
 720
 721                 entry_ex->entry.flags.client = 0;
 722                 entry_ex->entry.flags.forwardable = 1;
 723                 entry_ex->entry.flags.ok_as_delegate = 0;
 724         } else if (entry_ex->entry.flags.server && ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
 725                 /* The account/password expiry only applies when the account is used as a
 726                  * client (ie password login), not when used as a server */
 727
 728                 /* Make very well sure we don't use this for a client,
 729                  * it could bypass the password restrictions */
 730                 entry_ex->entry.flags.client = 0;
 731
 732                 entry_ex->entry.valid_end = NULL;
 733                 entry_ex->entry.pw_end = NULL;
 734
 735         } else {
 736                 NTTIME must_change_time
 737                         = samdb_result_force_password_change(kdc_db_ctx->samdb, mem_ctx,
 738                                                              realm_dn, msg);
 739                 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
 740                         entry_ex->entry.pw_end = NULL;
 741                 } else {
 742                         entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
 743                         if (entry_ex->entry.pw_end == NULL) {
 744                                 ret = ENOMEM;
 745                                 goto out;
 746                         }
 747                         *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
 748                 }
 749
 750                 acct_expiry = samdb_result_account_expires(msg);
 751                 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
 752                         entry_ex->entry.valid_end = NULL;
 753                 } else {
 754                         entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
 755                         if (entry_ex->entry.valid_end == NULL) {
 756                                 ret = ENOMEM;
 757                                 goto out;
 758                         }
 759                         *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
 760                 }
 761         }
 762
 763         entry_ex->entry.valid_start = NULL;
 764
 765         entry_ex->entry.max_life = NULL;
 766
 767         entry_ex->entry.max_renew = NULL;
 768
 769         entry_ex->entry.generation = NULL;
 770
 771         /* Get keys from the db */
 772         ret = samba_kdc_message2entry_keys(context, p, msg,
 773                                            rid, is_rodc, userAccountControl,
 774                                            ent_type, entry_ex);
 775         if (ret) {
 776                 /* Could be bougus data in the entry, or out of memory */
 777                 goto out;
 778         }
 779
 780         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 781         if (entry_ex->entry.etypes == NULL) {
 782                 krb5_clear_error_message(context);
 783                 ret = ENOMEM;
 784                 goto out;
 785         }
 786         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 787         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 788         if (entry_ex->entry.etypes->val == NULL) {
 789                 krb5_clear_error_message(context);
 790                 ret = ENOMEM;
 791                 goto out;
 792         }
 793         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 794                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 795         }
 796
 797
 798         p->msg = talloc_steal(p, msg);
 799
 800 out:
 801         if (ret != 0) {
 802                 /* This doesn't free ent itself, that is for the eventual caller to do */
 803                 hdb_free_entry(context, entry_ex);
 804         } else {
 805                 talloc_steal(kdc_db_ctx, entry_ex->ctx);
 806         }
 807
 808         return ret;
 809 }
 810
 811 /*
 812  * Construct an hdb_entry from a directory entry.
 813  */
 814 static krb5_error_code samba_kdc_trust_message2entry(krb5_context context,
 815                                                struct samba_kdc_db_context *kdc_db_ctx,
 816                                                TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 817                                                enum trust_direction direction,
 818                                                struct ldb_dn *realm_dn,
 819                                                struct ldb_message *msg,
 820                                                hdb_entry_ex *entry_ex)
 821 {
 822         struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
 823         const char *dnsdomain;
 824         char *realm = strupper_talloc(mem_ctx, lpcfg_realm(lp_ctx));
 825         DATA_BLOB password_utf16;
 826         struct samr_Password password_hash;
 827         const struct ldb_val *password_val;
 828         struct trustAuthInOutBlob password_blob;
 829         struct samba_kdc_entry *p;
 830
 831         enum ndr_err_code ndr_err;
 832         int ret, trust_direction_flags;
 833         unsigned int i;
 834
 835         p = talloc(mem_ctx, struct samba_kdc_entry);
 836         if (!p) {
 837                 ret = ENOMEM;
 838                 goto out;
 839         }
 840
 841         p->kdc_db_ctx = kdc_db_ctx;
 842         p->entry_ex = entry_ex;
 843         p->realm_dn = realm_dn;
 844
 845         talloc_set_destructor(p, samba_kdc_entry_destructor);
 846
 847         /* make sure we do not have bogus data in there */
 848         memset(&entry_ex->entry, 0, sizeof(hdb_entry));
 849
 850         entry_ex->ctx = p;
 851         entry_ex->free_entry = samba_kdc_free_entry;
 852
 853         /* use 'whenCreated' */
 854         entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 855         /* use 'kadmin' for now (needed by mit_samba) */
 856         krb5_make_principal(context,
 857                             &entry_ex->entry.created_by.principal,
 858                             realm, "kadmin", NULL);
 859
 860         entry_ex->entry.valid_start = NULL;
 861
 862         trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
 863
 864         if (direction == INBOUND) {
 865                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
 866
 867         } else { /* OUTBOUND */
 868                 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
 869                 /* replace realm */
 870                 talloc_free(realm);
 871                 realm = strupper_talloc(mem_ctx, dnsdomain);
 872                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
 873         }
 874
 875         if (!password_val || !(trust_direction_flags & direction)) {
 876                 ret = ENOENT;
 877                 goto out;
 878         }
 879
 880         ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, &password_blob,
 881                                            (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
 882         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 883                 ret = EINVAL;
 884                 goto out;
 885         }
 886
 887         entry_ex->entry.kvno = -1;
 888         for (i=0; i < password_blob.count; i++) {
 889                 if (password_blob.current.array[i].AuthType == TRUST_AUTH_TYPE_VERSION) {
 890                         entry_ex->entry.kvno = password_blob.current.array[i].AuthInfo.version.version;
 891                 }
 892         }
 893
 894         for (i=0; i < password_blob.count; i++) {
 895                 if (password_blob.current.array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
 896                         password_utf16 = data_blob_const(password_blob.current.array[i].AuthInfo.clear.password,
 897                                                          password_blob.current.array[i].AuthInfo.clear.size);
 898                         /* In the future, generate all sorts of
 899                          * hashes, but for now we can't safely convert
 900                          * the random strings windows uses into
 901                          * utf8 */
 902
 903                         /* but as it is utf16 already, we can get the NT password/arcfour-hmac-md5 key */
 904                         mdfour(password_hash.hash, password_utf16.data, password_utf16.length);
 905                         break;
 906                 } else if (password_blob.current.array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
 907                         password_hash = password_blob.current.array[i].AuthInfo.nt4owf.password;
 908                         break;
 909                 }
 910         }
 911
 912         if (i < password_blob.count) {
 913                 Key key;
 914                 /* Must have found a cleartext or MD4 password */
 915                 entry_ex->entry.keys.val = calloc(1, sizeof(Key));
 916
 917                 key.mkvno = 0;
 918                 key.salt = NULL; /* No salt for this enc type */
 919
 920                 if (entry_ex->entry.keys.val == NULL) {
 921                         ret = ENOMEM;
 922                         goto out;
 923                 }
 924
 925                 ret = krb5_keyblock_init(context,
 926                                          ENCTYPE_ARCFOUR_HMAC,
 927                                          password_hash.hash, sizeof(password_hash.hash),
 928                                          &key.key);
 929
 930                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 931                 entry_ex->entry.keys.len++;
 932         }
 933
 934         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 935
 936         ret = copy_Principal(principal, entry_ex->entry.principal);
 937         if (ret) {
 938                 krb5_clear_error_message(context);
 939                 goto out;
 940         }
 941
 942         /* While we have copied the client principal, tests
 943          * show that Win2k3 returns the 'corrected' realm, not
 944          * the client-specified realm.  This code attempts to
 945          * replace the client principal's realm with the one
 946          * we determine from our records */
 947
 948         krb5_principal_set_realm(context, entry_ex->entry.principal, realm);
 949         entry_ex->entry.flags = int2HDBFlags(0);
 950         entry_ex->entry.flags.immutable = 1;
 951         entry_ex->entry.flags.invalid = 0;
 952         entry_ex->entry.flags.server = 1;
 953         entry_ex->entry.flags.require_preauth = 1;
 954
 955         entry_ex->entry.pw_end = NULL;
 956
 957         entry_ex->entry.max_life = NULL;
 958
 959         entry_ex->entry.max_renew = NULL;
 960
 961         entry_ex->entry.generation = NULL;
 962
 963         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 964         if (entry_ex->entry.etypes == NULL) {
 965                 krb5_clear_error_message(context);
 966                 ret = ENOMEM;
 967                 goto out;
 968         }
 969         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 970         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 971         if (entry_ex->entry.etypes->val == NULL) {
 972                 krb5_clear_error_message(context);
 973                 ret = ENOMEM;
 974                 goto out;
 975         }
 976         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 977                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 978         }
 979
 980
 981         p->msg = talloc_steal(p, msg);
 982
 983 out:
 984         if (ret != 0) {
 985                 /* This doesn't free ent itself, that is for the eventual caller to do */
 986                 hdb_free_entry(context, entry_ex);
 987         } else {
 988                 talloc_steal(kdc_db_ctx, entry_ex->ctx);
 989         }
 990
 991         return ret;
 992
 993 }
 994
 995 static krb5_error_code samba_kdc_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
 996                                         TALLOC_CTX *mem_ctx,
 997                                         const char *realm,
 998                                         struct ldb_dn *realm_dn,
 999                                         struct ldb_message **pmsg)
1000 {
1001         int lret;
1002         krb5_error_code ret;
1003         char *filter = NULL;
1004         const char * const *attrs = trust_attrs;
1005
1006         struct ldb_result *res = NULL;
1007         filter = talloc_asprintf(mem_ctx, "(&(objectClass=trustedDomain)(|(flatname=%s)(trustPartner=%s)))", realm, realm);
1008
1009         if (!filter) {
1010                 ret = ENOMEM;
1011                 krb5_set_error_message(context, ret, "talloc_asprintf: out of memory");
1012                 return ret;
1013         }
1014
1015         lret = ldb_search(ldb_ctx, mem_ctx, &res,
1016                           ldb_get_default_basedn(ldb_ctx),
1017                           LDB_SCOPE_SUBTREE, attrs, "%s", filter);
1018         if (lret != LDB_SUCCESS) {
1019                 DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx)));
1020                 return HDB_ERR_NOENTRY;
1021         } else if (res->count == 0 || res->count > 1) {
1022                 DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count));
1023                 talloc_free(res);
1024                 return HDB_ERR_NOENTRY;
1025         }
1026         talloc_steal(mem_ctx, res->msgs);
1027         *pmsg = res->msgs[0];
1028         talloc_free(res);
1029         return 0;
1030 }
1031
1032 static krb5_error_code samba_kdc_lookup_client(krb5_context context,
1033                                                 struct samba_kdc_db_context *kdc_db_ctx,
1034                                                 TALLOC_CTX *mem_ctx,
1035                                                 krb5_const_principal principal,
1036                                                 const char **attrs,
1037                                                 struct ldb_dn **realm_dn,
1038                                                 struct ldb_message **msg) {
1039         NTSTATUS nt_status;
1040         char *principal_string;
1041         krb5_error_code ret;
1042
1043         ret = krb5_unparse_name(context, principal, &principal_string);
1044
1045         if (ret != 0) {
1046                 return ret;
1047         }
1048
1049         nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1050                                               mem_ctx, principal_string, attrs,
1051                                               realm_dn, msg);
1052         free(principal_string);
1053         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1054                 return HDB_ERR_NOENTRY;
1055         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1056                 return ENOMEM;
1057         } else if (!NT_STATUS_IS_OK(nt_status)) {
1058                 return EINVAL;
1059         }
1060
1061         return ret;
1062 }
1063
1064 static krb5_error_code samba_kdc_fetch_client(krb5_context context,
1065                                                struct samba_kdc_db_context *kdc_db_ctx,
1066                                                TALLOC_CTX *mem_ctx,
1067                                                krb5_const_principal principal,
1068                                                hdb_entry_ex *entry_ex) {
1069         struct ldb_dn *realm_dn;
1070         krb5_error_code ret;
1071         struct ldb_message *msg = NULL;
1072
1073         ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1074                                        mem_ctx, principal, user_attrs,
1075                                        &realm_dn, &msg);
1076         if (ret != 0) {
1077                 return ret;
1078         }
1079
1080         ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1081                                        principal, SAMBA_KDC_ENT_TYPE_CLIENT,
1082                                        realm_dn, msg, entry_ex);
1083         return ret;
1084 }
1085
1086 static krb5_error_code samba_kdc_fetch_krbtgt(krb5_context context,
1087                                               struct samba_kdc_db_context *kdc_db_ctx,
1088                                               TALLOC_CTX *mem_ctx,
1089                                               krb5_const_principal principal,
1090                                               uint32_t krbtgt_number,
1091                                               hdb_entry_ex *entry_ex)
1092 {
1093         struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1094         krb5_error_code ret;
1095         struct ldb_message *msg = NULL;
1096         struct ldb_dn *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1097
1098         krb5_principal alloc_principal = NULL;
1099         if (principal->name.name_string.len != 2
1100             || (strcmp(principal->name.name_string.val[0], KRB5_TGS_NAME) != 0)) {
1101                 /* Not a krbtgt */
1102                 return HDB_ERR_NOENTRY;
1103         }
1104
1105         /* krbtgt case.  Either us or a trusted realm */
1106
1107         if (lpcfg_is_my_domain_or_realm(lp_ctx, principal->realm)
1108             && lpcfg_is_my_domain_or_realm(lp_ctx, principal->name.name_string.val[1])) {
1109                 /* us, or someone quite like us */
1110                 /* Cludge, cludge cludge.  If the realm part of krbtgt/realm,
1111                  * is in our db, then direct the caller at our primary
1112                  * krbtgt */
1113
1114                 int lret;
1115                 char *realm_fixed;
1116
1117                 if (krbtgt_number == kdc_db_ctx->my_krbtgt_number) {
1118                         lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1119                                                &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1120                                                krbtgt_attrs, 0,
1121                                                "(objectClass=user)");
1122                 } else {
1123                         /* We need to look up an RODC krbtgt (perhaps
1124                          * ours, if we are an RODC, perhaps another
1125                          * RODC if we are a read-write DC */
1126                         lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1127                                                &msg, realm_dn, LDB_SCOPE_SUBTREE,
1128                                                krbtgt_attrs,
1129                                                DSDB_SEARCH_SHOW_EXTENDED_DN,
1130                                                "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=%u))", (unsigned)(krbtgt_number));
1131                 }
1132
1133                 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1134                         krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1135                                    (unsigned)(krbtgt_number));
1136                         krb5_set_error_message(context, HDB_ERR_NOENTRY,
1137                                                "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1138                                                (unsigned)(krbtgt_number));
1139                         return HDB_ERR_NOENTRY;
1140                 } else if (lret != LDB_SUCCESS) {
1141                         krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1142                                    (unsigned)(krbtgt_number));
1143                         krb5_set_error_message(context, HDB_ERR_NOENTRY,
1144                                                "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1145                                                (unsigned)(krbtgt_number));
1146                         return HDB_ERR_NOENTRY;
1147                 }
1148
1149                 realm_fixed = strupper_talloc(mem_ctx, lpcfg_realm(lp_ctx));
1150                 if (!realm_fixed) {
1151                         ret = ENOMEM;
1152                         krb5_set_error_message(context, ret, "strupper_talloc: out of memory");
1153                         return ret;
1154                 }
1155
1156                 ret = krb5_copy_principal(context, principal, &alloc_principal);
1157                 if (ret) {
1158                         return ret;
1159                 }
1160
1161                 free(alloc_principal->name.name_string.val[1]);
1162                 alloc_principal->name.name_string.val[1] = strdup(realm_fixed);
1163                 talloc_free(realm_fixed);
1164                 if (!alloc_principal->name.name_string.val[1]) {
1165                         ret = ENOMEM;
1166                         krb5_set_error_message(context, ret, "samba_kdc_fetch: strdup() failed!");
1167                         return ret;
1168                 }
1169                 principal = alloc_principal;
1170
1171                 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1172                                         principal, SAMBA_KDC_ENT_TYPE_KRBTGT,
1173                                         realm_dn, msg, entry_ex);
1174                 if (ret != 0) {
1175                         krb5_warnx(context, "samba_kdc_fetch: self krbtgt message2entry failed");
1176                 }
1177                 return ret;
1178
1179         } else {
1180                 enum trust_direction direction = UNKNOWN;
1181                 const char *realm = NULL;
1182
1183                 /* Either an inbound or outbound trust */
1184
1185                 if (strcasecmp(lpcfg_realm(lp_ctx), principal->realm) == 0) {
1186                         /* look for inbound trust */
1187                         direction = INBOUND;
1188                         realm = principal->name.name_string.val[1];
1189                 } else if (strcasecmp(lpcfg_realm(lp_ctx), principal->name.name_string.val[1]) == 0) {
1190                         /* look for outbound trust */
1191                         direction = OUTBOUND;
1192                         realm = principal->realm;
1193                 } else {
1194                         krb5_warnx(context, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1195                                    principal->realm, principal->name.name_string.val[1]);
1196                         krb5_set_error_message(context, HDB_ERR_NOENTRY, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1197                                                principal->realm, principal->name.name_string.val[1]);
1198                         return HDB_ERR_NOENTRY;
1199                 }
1200
1201                 /* Trusted domains are under CN=system */
1202
1203                 ret = samba_kdc_lookup_trust(context, kdc_db_ctx->samdb,
1204                                        mem_ctx,
1205                                        realm, realm_dn, &msg);
1206
1207                 if (ret != 0) {
1208                         krb5_warnx(context, "samba_kdc_fetch: could not find principal in DB");
1209                         krb5_set_error_message(context, ret, "samba_kdc_fetch: could not find principal in DB");
1210                         return ret;
1211                 }
1212
1213                 ret = samba_kdc_trust_message2entry(context, kdc_db_ctx, mem_ctx,
1214                                               principal, direction,
1215                                               realm_dn, msg, entry_ex);
1216                 if (ret != 0) {
1217                         krb5_warnx(context, "samba_kdc_fetch: trust_message2entry failed");
1218                 }
1219                 return ret;
1220         }
1221
1222 }
1223
1224 static krb5_error_code samba_kdc_lookup_server(krb5_context context,
1225                                                 struct samba_kdc_db_context *kdc_db_ctx,
1226                                                 TALLOC_CTX *mem_ctx,
1227                                                 krb5_const_principal principal,
1228                                                 const char **attrs,
1229                                                 struct ldb_dn **realm_dn,
1230                                                 struct ldb_message **msg)
1231 {
1232         krb5_error_code ret;
1233         const char *realm;
1234         if (principal->name.name_string.len >= 2) {
1235                 /* 'normal server' case */
1236                 int ldb_ret;
1237                 NTSTATUS nt_status;
1238                 struct ldb_dn *user_dn;
1239                 char *principal_string;
1240
1241                 ret = krb5_unparse_name_flags(context, principal,
1242                                               KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1243                                               &principal_string);
1244                 if (ret != 0) {
1245                         return ret;
1246                 }
1247
1248                 /* At this point we may find the host is known to be
1249                  * in a different realm, so we should generate a
1250                  * referral instead */
1251                 nt_status = crack_service_principal_name(kdc_db_ctx->samdb,
1252                                                          mem_ctx, principal_string,
1253                                                          &user_dn, realm_dn);
1254                 free(principal_string);
1255
1256                 if (!NT_STATUS_IS_OK(nt_status)) {
1257                         return HDB_ERR_NOENTRY;
1258                 }
1259
1260                 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb,
1261                                           mem_ctx,
1262                                           msg, user_dn, LDB_SCOPE_BASE,
1263                                           attrs, DSDB_SEARCH_SHOW_EXTENDED_DN, "(objectClass=*)");
1264                 if (ldb_ret != LDB_SUCCESS) {
1265                         return HDB_ERR_NOENTRY;
1266                 }
1267
1268         } else {
1269                 int lret;
1270                 char *filter = NULL;
1271                 char *short_princ;
1272                 /* server as client principal case, but we must not lookup userPrincipalNames */
1273                 *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1274                 realm = krb5_principal_get_realm(context, principal);
1275
1276                 /* TODO: Check if it is our realm, otherwise give referall */
1277
1278                 ret = krb5_unparse_name_flags(context, principal,  KRB5_PRINCIPAL_UNPARSE_NO_REALM, &short_princ);
1279
1280                 if (ret != 0) {
1281                         krb5_set_error_message(context, ret, "samba_kdc_lookup_principal: could not parse principal");
1282                         krb5_warnx(context, "samba_kdc_lookup_principal: could not parse principal");
1283                         return ret;
1284                 }
1285
1286                 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx, msg,
1287                                        *realm_dn, LDB_SCOPE_SUBTREE,
1288                                        attrs,
1289                                        DSDB_SEARCH_SHOW_EXTENDED_DN,
1290                                        "(&(objectClass=user)(samAccountName=%s))",
1291                                        ldb_binary_encode_string(mem_ctx, short_princ));
1292                 free(short_princ);
1293                 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1294                         DEBUG(3, ("Failed find a entry for %s\n", filter));
1295                         return HDB_ERR_NOENTRY;
1296                 }
1297                 if (lret != LDB_SUCCESS) {
1298                         DEBUG(3, ("Failed single search for for %s - %s\n",
1299                                   filter, ldb_errstring(kdc_db_ctx->samdb)));
1300                         return HDB_ERR_NOENTRY;
1301                 }
1302         }
1303
1304         return 0;
1305 }
1306
1307 static krb5_error_code samba_kdc_fetch_server(krb5_context context,
1308                                                struct samba_kdc_db_context *kdc_db_ctx,
1309                                                TALLOC_CTX *mem_ctx,
1310                                                krb5_const_principal principal,
1311                                                hdb_entry_ex *entry_ex)
1312 {
1313         krb5_error_code ret;
1314         struct ldb_dn *realm_dn;
1315         struct ldb_message *msg;
1316
1317         ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, principal,
1318                                        server_attrs, &realm_dn, &msg);
1319         if (ret != 0) {
1320                 return ret;
1321         }
1322
1323         ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1324                                 principal, SAMBA_KDC_ENT_TYPE_SERVER,
1325                                 realm_dn, msg, entry_ex);
1326         if (ret != 0) {
1327                 krb5_warnx(context, "samba_kdc_fetch: message2entry failed");
1328         }
1329
1330         return ret;
1331 }
1332
1333 krb5_error_code samba_kdc_fetch(krb5_context context,
1334                                 struct samba_kdc_db_context *kdc_db_ctx,
1335                                 krb5_const_principal principal,
1336                                 unsigned flags,
1337                                 unsigned kvno,
1338                                 hdb_entry_ex *entry_ex)
1339 {
1340         krb5_error_code ret = HDB_ERR_NOENTRY;
1341         TALLOC_CTX *mem_ctx;
1342         unsigned int krbtgt_number;
1343         if (flags & HDB_F_KVNO_SPECIFIED) {
1344                 krbtgt_number = kvno >> 16;
1345                 if (kdc_db_ctx->rodc) {
1346                         if (krbtgt_number != kdc_db_ctx->my_krbtgt_number) {
1347                                 return HDB_ERR_NOT_FOUND_HERE;
1348                         }
1349                 }
1350         } else {
1351                 krbtgt_number = kdc_db_ctx->my_krbtgt_number;
1352         }
1353
1354         mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_fetch context");
1355         if (!mem_ctx) {
1356                 ret = ENOMEM;
1357                 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1358                 return ret;
1359         }
1360
1361         if (flags & HDB_F_GET_CLIENT) {
1362                 ret = samba_kdc_fetch_client(context, kdc_db_ctx, mem_ctx, principal, entry_ex);
1363                 if (ret != HDB_ERR_NOENTRY) goto done;
1364         }
1365         if (flags & HDB_F_GET_SERVER) {
1366                 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
1367                 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, krbtgt_number, entry_ex);
1368                 if (ret != HDB_ERR_NOENTRY) goto done;
1369
1370                 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
1371                 ret = samba_kdc_fetch_server(context, kdc_db_ctx, mem_ctx, principal, entry_ex);
1372                 if (ret != HDB_ERR_NOENTRY) goto done;
1373         }
1374         if (flags & HDB_F_GET_KRBTGT) {
1375                 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, krbtgt_number, entry_ex);
1376                 if (ret != HDB_ERR_NOENTRY) goto done;
1377         }
1378
1379 done:
1380         talloc_free(mem_ctx);
1381         return ret;
1382 }
1383
1384 struct samba_kdc_seq {
1385         unsigned int index;
1386         unsigned int count;
1387         struct ldb_message **msgs;
1388         struct ldb_dn *realm_dn;
1389 };
1390
1391 static krb5_error_code samba_kdc_seq(krb5_context context,
1392                                      struct samba_kdc_db_context *kdc_db_ctx,
1393                                      hdb_entry_ex *entry)
1394 {
1395         krb5_error_code ret;
1396         struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
1397         TALLOC_CTX *mem_ctx;
1398         hdb_entry_ex entry_ex;
1399         memset(&entry_ex, '\0', sizeof(entry_ex));
1400
1401         if (!priv) {
1402                 return HDB_ERR_NOENTRY;
1403         }
1404
1405         mem_ctx = talloc_named(priv, 0, "samba_kdc_seq context");
1406
1407         if (!mem_ctx) {
1408                 ret = ENOMEM;
1409                 krb5_set_error_message(context, ret, "samba_kdc_seq: talloc_named() failed!");
1410                 return ret;
1411         }
1412
1413         if (priv->index < priv->count) {
1414                 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1415                                         NULL, SAMBA_KDC_ENT_TYPE_ANY,
1416                                         priv->realm_dn, priv->msgs[priv->index++], entry);
1417         } else {
1418                 ret = HDB_ERR_NOENTRY;
1419         }
1420
1421         if (ret != 0) {
1422                 TALLOC_FREE(priv);
1423                 kdc_db_ctx->seq_ctx = NULL;
1424         } else {
1425                 talloc_free(mem_ctx);
1426         }
1427
1428         return ret;
1429 }
1430
1431 krb5_error_code samba_kdc_firstkey(krb5_context context,
1432                                    struct samba_kdc_db_context *kdc_db_ctx,
1433                                    hdb_entry_ex *entry)
1434 {
1435         struct ldb_context *ldb_ctx = kdc_db_ctx->samdb;
1436         struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
1437         char *realm;
1438         struct ldb_result *res = NULL;
1439         krb5_error_code ret;
1440         TALLOC_CTX *mem_ctx;
1441         int lret;
1442
1443         if (priv) {
1444                 TALLOC_FREE(priv);
1445                 kdc_db_ctx->seq_ctx = NULL;
1446         }
1447
1448         priv = (struct samba_kdc_seq *) talloc(kdc_db_ctx, struct samba_kdc_seq);
1449         if (!priv) {
1450                 ret = ENOMEM;
1451                 krb5_set_error_message(context, ret, "talloc: out of memory");
1452                 return ret;
1453         }
1454
1455         priv->index = 0;
1456         priv->msgs = NULL;
1457         priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
1458         priv->count = 0;
1459
1460         mem_ctx = talloc_named(priv, 0, "samba_kdc_firstkey context");
1461
1462         if (!mem_ctx) {
1463                 ret = ENOMEM;
1464                 krb5_set_error_message(context, ret, "samba_kdc_firstkey: talloc_named() failed!");
1465                 return ret;
1466         }
1467
1468         ret = krb5_get_default_realm(context, &realm);
1469         if (ret != 0) {
1470                 TALLOC_FREE(priv);
1471                 return ret;
1472         }
1473
1474         lret = ldb_search(ldb_ctx, priv, &res,
1475                           priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
1476                           "(objectClass=user)");
1477
1478         if (lret != LDB_SUCCESS) {
1479                 TALLOC_FREE(priv);
1480                 return HDB_ERR_NOENTRY;
1481         }
1482
1483         priv->count = res->count;
1484         priv->msgs = talloc_steal(priv, res->msgs);
1485         talloc_free(res);
1486
1487         kdc_db_ctx->seq_ctx = priv;
1488
1489         ret = samba_kdc_seq(context, kdc_db_ctx, entry);
1490
1491         if (ret != 0) {
1492                 TALLOC_FREE(priv);
1493                 kdc_db_ctx->seq_ctx = NULL;
1494         } else {
1495                 talloc_free(mem_ctx);
1496         }
1497         return ret;
1498 }
1499
1500 krb5_error_code samba_kdc_nextkey(krb5_context context,
1501                                   struct samba_kdc_db_context *kdc_db_ctx,
1502                                   hdb_entry_ex *entry)
1503 {
1504         return samba_kdc_seq(context, kdc_db_ctx, entry);
1505 }
1506
1507 /* Check if a given entry may delegate or do s4u2self to this target principal
1508  *
1509  * This is currently a very nasty hack - allowing only delegation to itself.
1510  *
1511  * This is shared between the constrained delegation and S4U2Self code.
1512  */
1513 krb5_error_code
1514 samba_kdc_check_identical_client_and_server(krb5_context context,
1515                                             struct samba_kdc_db_context *kdc_db_ctx,
1516                                             hdb_entry_ex *entry,
1517                                             krb5_const_principal target_principal)
1518 {
1519         krb5_error_code ret;
1520         krb5_principal enterprise_prinicpal = NULL;
1521         struct ldb_dn *realm_dn;
1522         struct ldb_message *msg;
1523         struct dom_sid *orig_sid;
1524         struct dom_sid *target_sid;
1525         struct samba_kdc_entry *p = talloc_get_type(entry->ctx, struct samba_kdc_entry);
1526         const char *delegation_check_attrs[] = {
1527                 "objectSid", NULL
1528         };
1529
1530         TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_constrained_delegation");
1531
1532         if (!mem_ctx) {
1533                 ret = ENOMEM;
1534                 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1535                 return ret;
1536         }
1537
1538         if (target_principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1539                 /* Need to reparse the enterprise principal to find the real target */
1540                 if (target_principal->name.name_string.len != 1) {
1541                         ret = KRB5_PARSE_MALFORMED;
1542                         krb5_set_error_message(context, ret, "samba_kdc_check_constrained_delegation: request for delegation to enterprise principal with wrong (%d) number of components",
1543                                                target_principal->name.name_string.len);
1544                         talloc_free(mem_ctx);
1545                         return ret;
1546                 }
1547                 ret = krb5_parse_name(context, target_principal->name.name_string.val[0],
1548                                       &enterprise_prinicpal);
1549                 if (ret) {
1550                         talloc_free(mem_ctx);
1551                         return ret;
1552                 }
1553                 target_principal = enterprise_prinicpal;
1554         }
1555
1556         ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, target_principal,
1557                                        delegation_check_attrs, &realm_dn, &msg);
1558
1559         krb5_free_principal(context, enterprise_prinicpal);
1560
1561         if (ret != 0) {
1562                 talloc_free(mem_ctx);
1563                 return ret;
1564         }
1565
1566         orig_sid = samdb_result_dom_sid(mem_ctx, p->msg, "objectSid");
1567         target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
1568
1569         /* Allow delegation to the same principal, even if by a different
1570          * name.  The easy and safe way to prove this is by SID
1571          * comparison */
1572         if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
1573                 talloc_free(mem_ctx);
1574                 return KRB5KDC_ERR_BADOPTION;
1575         }
1576
1577         talloc_free(mem_ctx);
1578         return ret;
1579 }
1580
1581 /* Certificates printed by a the Certificate Authority might have a
1582  * slightly different form of the user principal name to that in the
1583  * database.  Allow a mismatch where they both refer to the same
1584  * SID */
1585
1586 krb5_error_code
1587 samba_kdc_check_pkinit_ms_upn_match(krb5_context context,
1588                                     struct samba_kdc_db_context *kdc_db_ctx,
1589                                      hdb_entry_ex *entry,
1590                                      krb5_const_principal certificate_principal)
1591 {
1592         krb5_error_code ret;
1593         struct ldb_dn *realm_dn;
1594         struct ldb_message *msg;
1595         struct dom_sid *orig_sid;
1596         struct dom_sid *target_sid;
1597         struct samba_kdc_entry *p = talloc_get_type(entry->ctx, struct samba_kdc_entry);
1598         const char *ms_upn_check_attrs[] = {
1599                 "objectSid", NULL
1600         };
1601
1602         TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_pkinit_ms_upn_match");
1603
1604         if (!mem_ctx) {
1605                 ret = ENOMEM;
1606                 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1607                 return ret;
1608         }
1609
1610         ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1611                                        mem_ctx, certificate_principal,
1612                                        ms_upn_check_attrs, &realm_dn, &msg);
1613
1614         if (ret != 0) {
1615                 talloc_free(mem_ctx);
1616                 return ret;
1617         }
1618
1619         orig_sid = samdb_result_dom_sid(mem_ctx, p->msg, "objectSid");
1620         target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
1621
1622         /* Consider these to be the same principal, even if by a different
1623          * name.  The easy and safe way to prove this is by SID
1624          * comparison */
1625         if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
1626                 talloc_free(mem_ctx);
1627                 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1628         }
1629
1630         talloc_free(mem_ctx);
1631         return ret;
1632 }
1633
1634 NTSTATUS samba_kdc_setup_db_ctx(TALLOC_CTX *mem_ctx, struct samba_kdc_base_context *base_ctx,
1635                                 struct samba_kdc_db_context **kdc_db_ctx_out)
1636 {
1637         NTSTATUS nt_status;
1638         int ldb_ret;
1639         struct ldb_message *msg;
1640         struct auth_session_info *session_info;
1641         struct samba_kdc_db_context *kdc_db_ctx;
1642         /* The idea here is very simple.  Using Kerberos to
1643          * authenticate the KDC to the LDAP server is higly likely to
1644          * be circular.
1645          *
1646          * In future we may set this up to use EXERNAL and SSL
1647          * certificates, for now it will almost certainly be NTLMSSP_SET_USERNAME
1648         */
1649
1650         kdc_db_ctx = talloc_zero(mem_ctx, struct samba_kdc_db_context);
1651         if (kdc_db_ctx == NULL) {
1652                 return NT_STATUS_NO_MEMORY;
1653         }
1654         kdc_db_ctx->ev_ctx = base_ctx->ev_ctx;
1655         kdc_db_ctx->lp_ctx = base_ctx->lp_ctx;
1656
1657 #if 1
1658         /* we would prefer to use system_session(), as that would
1659          * allow us to share the samdb backend context with other parts of the
1660          * system. For now we can't as we need to override the
1661          * credentials to set CRED_DONT_USE_KERBEROS, which would
1662          * break other users of the system_session */
1663         DEBUG(0,("FIXME: Using new system session for hdb\n"));
1664         nt_status = auth_system_session_info(kdc_db_ctx, base_ctx->lp_ctx, &session_info);
1665         if (!NT_STATUS_IS_OK(nt_status)) {
1666                return nt_status;
1667         }
1668 #else
1669         session_info = system_session(kdc_db_ctx->lp_ctx);
1670         if (session_info == NULL) {
1671                 return NT_STATUS_INTERNAL_ERROR;
1672         }
1673 #endif
1674
1675         cli_credentials_set_kerberos_state(session_info->credentials,
1676                                            CRED_DONT_USE_KERBEROS);
1677
1678         /* Setup the link to LDB */
1679         kdc_db_ctx->samdb = samdb_connect(kdc_db_ctx, base_ctx->ev_ctx,
1680                                           base_ctx->lp_ctx, session_info);
1681         if (kdc_db_ctx->samdb == NULL) {
1682                 DEBUG(1, ("hdb_samba4_create: Cannot open samdb for KDC backend!"));
1683                 talloc_free(kdc_db_ctx);
1684                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1685         }
1686
1687         /* Find out our own krbtgt kvno */
1688         ldb_ret = samdb_rodc(kdc_db_ctx->samdb, &kdc_db_ctx->rodc);
1689         if (ldb_ret != LDB_SUCCESS) {
1690                 DEBUG(1, ("hdb_samba4_create: Cannot determine if we are an RODC in KDC backend: %s\n",
1691                           ldb_errstring(kdc_db_ctx->samdb)));
1692                 talloc_free(kdc_db_ctx);
1693                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1694         }
1695         if (kdc_db_ctx->rodc) {
1696                 int my_krbtgt_number;
1697                 const char *secondary_keytab[] = { "msDS-SecondaryKrbTgtNumber", NULL };
1698                 struct ldb_dn *account_dn;
1699                 struct ldb_dn *server_dn = samdb_server_dn(kdc_db_ctx->samdb, kdc_db_ctx);
1700                 if (!server_dn) {
1701                         DEBUG(1, ("hdb_samba4_create: Cannot determine server DN in KDC backend: %s\n",
1702                                   ldb_errstring(kdc_db_ctx->samdb)));
1703                         talloc_free(kdc_db_ctx);
1704                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1705                 }
1706
1707                 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, server_dn,
1708                                              "serverReference", &account_dn);
1709                 if (ldb_ret != LDB_SUCCESS) {
1710                         DEBUG(1, ("hdb_samba4_create: Cannot determine server account in KDC backend: %s\n",
1711                                   ldb_errstring(kdc_db_ctx->samdb)));
1712                         talloc_free(kdc_db_ctx);
1713                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1714                 }
1715
1716                 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, account_dn,
1717                                              "msDS-KrbTgtLink", &kdc_db_ctx->krbtgt_dn);
1718                 talloc_free(account_dn);
1719                 if (ldb_ret != LDB_SUCCESS) {
1720                         DEBUG(1, ("hdb_samba4_create: Cannot determine RODC krbtgt account in KDC backend: %s\n",
1721                                   ldb_errstring(kdc_db_ctx->samdb)));
1722                         talloc_free(kdc_db_ctx);
1723                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1724                 }
1725
1726                 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
1727                                           &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1728                                           secondary_keytab,
1729                                           0,
1730                                           "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=*))");
1731                 if (ldb_ret != LDB_SUCCESS) {
1732                         DEBUG(1, ("hdb_samba4_create: Cannot read krbtgt account %s in KDC backend to get msDS-SecondaryKrbTgtNumber: %s: %s\n",
1733                                   ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
1734                                   ldb_errstring(kdc_db_ctx->samdb),
1735                                   ldb_strerror(ldb_ret)));
1736                         talloc_free(kdc_db_ctx);
1737                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1738                 }
1739                 my_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
1740                 if (my_krbtgt_number == -1) {
1741                         DEBUG(1, ("hdb_samba4_create: Cannot read msDS-SecondaryKrbTgtNumber from krbtgt account %s in KDC backend: got %d\n",
1742                                   ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
1743                                   my_krbtgt_number));
1744                         talloc_free(kdc_db_ctx);
1745                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1746                 }
1747                 kdc_db_ctx->my_krbtgt_number = my_krbtgt_number;
1748
1749         } else {
1750                 kdc_db_ctx->my_krbtgt_number = 0;
1751                 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
1752                                           &msg, NULL, LDB_SCOPE_SUBTREE,
1753                                           krbtgt_attrs,
1754                                           DSDB_SEARCH_SHOW_EXTENDED_DN,
1755                                           "(&(objectClass=user)(samAccountName=krbtgt))");
1756
1757                 if (ldb_ret != LDB_SUCCESS) {
1758                         DEBUG(1, ("samba_kdc_fetch: could not find own KRBTGT in DB: %s\n", ldb_errstring(kdc_db_ctx->samdb)));
1759                         talloc_free(kdc_db_ctx);
1760                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1761                 }
1762                 kdc_db_ctx->krbtgt_dn = talloc_steal(kdc_db_ctx, msg->dn);
1763                 kdc_db_ctx->my_krbtgt_number = 0;
1764                 talloc_free(msg);
1765         }
1766         *kdc_db_ctx_out = kdc_db_ctx;
1767         return NT_STATUS_OK;
1768 }