source4/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 "dsdb/common/flags.h"
  38 #include "lib/ldb/include/ldb.h"
  39 #include "lib/ldb/include/ldb_errors.h"
  40 #include "librpc/gen_ndr/netlogon.h"
  41 #include "auth/auth.h"
  42 #include "auth/credentials/credentials.h"
  43 #include "auth/auth_sam.h"
  44 #include "util/util_ldb.h"
  45 #include "dsdb/samdb/samdb.h"
  46 #include "librpc/ndr/libndr.h"
  47 #include "librpc/gen_ndr/ndr_drsblobs.h"
  48 #include "librpc/gen_ndr/lsa.h"
  49 #include "libcli/auth/libcli_auth.h"
  50 #include "param/param.h"
  51 #include "events/events.h"
  52 #include "kdc/kdc.h"
  53 #include "lib/crypto/md4.h"
  54
  55 enum hdb_ldb_ent_type
  56 { HDB_LDB_ENT_TYPE_CLIENT, HDB_LDB_ENT_TYPE_SERVER,
  57   HDB_LDB_ENT_TYPE_KRBTGT, HDB_LDB_ENT_TYPE_TRUST, HDB_LDB_ENT_TYPE_ANY };
  58
  59 enum trust_direction {
  60         UNKNOWN = 0,
  61         INBOUND = LSA_TRUST_DIRECTION_INBOUND,
  62         OUTBOUND = LSA_TRUST_DIRECTION_OUTBOUND
  63 };
  64
  65 static const char *realm_ref_attrs[] = {
  66         "nCName",
  67         "dnsRoot",
  68         NULL
  69 };
  70
  71 static const char *trust_attrs[] = {
  72         "trustPartner",
  73         "trustAuthIncoming",
  74         "trustAuthOutgoing",
  75         "whenCreated",
  76         "msDS-SupportedEncryptionTypes",
  77         "trustAttributes",
  78         "trustDirection",
  79         "trustType",
  80         NULL
  81 };
  82
  83 static KerberosTime ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, KerberosTime default_val)
  84 {
  85     const char *tmp;
  86     const char *gentime;
  87     struct tm tm;
  88
  89     gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
  90     if (!gentime)
  91         return default_val;
  92
  93     tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
  94     if (tmp == NULL) {
  95             return default_val;
  96     }
  97
  98     return timegm(&tm);
  99 }
 100
 101 static HDBFlags uf2HDBFlags(krb5_context context, int userAccountControl, enum hdb_ldb_ent_type ent_type)
 102 {
 103         HDBFlags flags = int2HDBFlags(0);
 104
 105         /* we don't allow kadmin deletes */
 106         flags.immutable = 1;
 107
 108         /* mark the principal as invalid to start with */
 109         flags.invalid = 1;
 110
 111         flags.renewable = 1;
 112
 113         /* All accounts are servers, but this may be disabled again in the caller */
 114         flags.server = 1;
 115
 116         /* Account types - clear the invalid bit if it turns out to be valid */
 117         if (userAccountControl & UF_NORMAL_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         if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
 125                 if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
 126                         flags.client = 1;
 127                 }
 128                 flags.invalid = 0;
 129         }
 130         if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
 131                 if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
 132                         flags.client = 1;
 133                 }
 134                 flags.invalid = 0;
 135         }
 136         if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
 137                 if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
 138                         flags.client = 1;
 139                 }
 140                 flags.invalid = 0;
 141         }
 142
 143         /* Not permitted to act as a client if disabled */
 144         if (userAccountControl & UF_ACCOUNTDISABLE) {
 145                 flags.client = 0;
 146         }
 147         if (userAccountControl & UF_LOCKOUT) {
 148                 flags.invalid = 1;
 149         }
 150 /*
 151         if (userAccountControl & UF_PASSWORD_NOTREQD) {
 152                 flags.invalid = 1;
 153         }
 154 */
 155 /*
 156         UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
 157 */
 158         if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
 159                 flags.invalid = 1;
 160         }
 161
 162 /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in LDB_message2entry() */
 163
 164 /*
 165         if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
 166                 flags.invalid = 1;
 167         }
 168 */
 169         if (userAccountControl & UF_SMARTCARD_REQUIRED) {
 170                 flags.require_hwauth = 1;
 171         }
 172         if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
 173                 flags.ok_as_delegate = 1;
 174         }
 175         if (!(userAccountControl & UF_NOT_DELEGATED)) {
 176                 flags.forwardable = 1;
 177                 flags.proxiable = 1;
 178         }
 179
 180         if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
 181                 flags.require_preauth = 0;
 182         } else {
 183                 flags.require_preauth = 1;
 184
 185         }
 186         return flags;
 187 }
 188
 189 static int hdb_ldb_destrutor(struct hdb_ldb_private *private)
 190 {
 191     hdb_entry_ex *entry_ex = private->entry_ex;
 192     free_hdb_entry(&entry_ex->entry);
 193     return 0;
 194 }
 195
 196 static void hdb_ldb_free_entry(krb5_context context, hdb_entry_ex *entry_ex)
 197 {
 198         talloc_free(entry_ex->ctx);
 199 }
 200
 201 static krb5_error_code LDB_message2entry_keys(krb5_context context,
 202                                               struct smb_iconv_convenience *iconv_convenience,
 203                                               TALLOC_CTX *mem_ctx,
 204                                               struct ldb_message *msg,
 205                                               unsigned int userAccountControl,
 206                                               hdb_entry_ex *entry_ex)
 207 {
 208         krb5_error_code ret = 0;
 209         enum ndr_err_code ndr_err;
 210         struct samr_Password *hash;
 211         const struct ldb_val *sc_val;
 212         struct supplementalCredentialsBlob scb;
 213         struct supplementalCredentialsPackage *scpk = NULL;
 214         bool newer_keys = false;
 215         struct package_PrimaryKerberosBlob _pkb;
 216         struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
 217         struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
 218         uint32_t i;
 219         uint32_t allocated_keys = 0;
 220
 221         entry_ex->entry.keys.val = NULL;
 222         entry_ex->entry.keys.len = 0;
 223
 224         entry_ex->entry.kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
 225
 226         /* Get keys from the db */
 227
 228         hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
 229         sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
 230
 231         /* unicodePwd for enctype 0x17 (23) if present */
 232         if (hash) {
 233                 allocated_keys++;
 234         }
 235
 236         /* supplementalCredentials if present */
 237         if (sc_val) {
 238                 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, iconv_convenience, &scb,
 239                                                    (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
 240                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 241                         dump_data(0, sc_val->data, sc_val->length);
 242                         ret = EINVAL;
 243                         goto out;
 244                 }
 245
 246                 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
 247                         NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
 248                         ret = EINVAL;
 249                         goto out;
 250                 }
 251
 252                 for (i=0; i < scb.sub.num_packages; i++) {
 253                         if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
 254                                 scpk = &scb.sub.packages[i];
 255                                 if (!scpk->data || !scpk->data[0]) {
 256                                         scpk = NULL;
 257                                         continue;
 258                                 }
 259                                 newer_keys = true;
 260                                 break;
 261                         } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
 262                                 scpk = &scb.sub.packages[i];
 263                                 if (!scpk->data || !scpk->data[0]) {
 264                                         scpk = NULL;
 265                                 }
 266                                 /*
 267                                  * we don't break here in hope to find
 268                                  * a Kerberos-Newer-Keys package
 269                                  */
 270                         }
 271                 }
 272         }
 273         /*
 274          * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
 275          * of supplementalCredentials
 276          */
 277         if (scpk) {
 278                 DATA_BLOB blob;
 279
 280                 blob = strhex_to_data_blob(scpk->data);
 281                 if (!blob.data) {
 282                         ret = ENOMEM;
 283                         goto out;
 284                 }
 285                 talloc_steal(mem_ctx, blob.data);
 286
 287                 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
 288                 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, iconv_convenience, &_pkb,
 289                                                (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
 290                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 291                         krb5_set_error_string(context, "LDB_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 292                         krb5_warnx(context, "LDB_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 293                         ret = EINVAL;
 294                         goto out;
 295                 }
 296
 297                 if (newer_keys && _pkb.version != 4) {
 298                         krb5_set_error_string(context, "LDB_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 299                         krb5_warnx(context, "LDB_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 300                         ret = EINVAL;
 301                         goto out;
 302                 }
 303
 304                 if (!newer_keys && _pkb.version != 3) {
 305                         krb5_set_error_string(context, "LDB_message2entry_keys: could not parse Primary:Kerberos not version 3");
 306                         krb5_warnx(context, "LDB_message2entry_keys: could not parse Primary:Kerberos not version 3");
 307                         ret = EINVAL;
 308                         goto out;
 309                 }
 310
 311                 if (_pkb.version == 4) {
 312                         pkb4 = &_pkb.ctr.ctr4;
 313                         allocated_keys += pkb4->num_keys;
 314                 } else if (_pkb.version == 3) {
 315                         pkb3 = &_pkb.ctr.ctr3;
 316                         allocated_keys += pkb3->num_keys;
 317                 }
 318         }
 319
 320         if (allocated_keys == 0) {
 321                 /* oh, no password.  Apparently (comment in
 322                  * hdb-ldap.c) this violates the ASN.1, but this
 323                  * allows an entry with no keys (yet). */
 324                 return 0;
 325         }
 326
 327         /* allocate space to decode into */
 328         entry_ex->entry.keys.len = 0;
 329         entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(Key));
 330         if (entry_ex->entry.keys.val == NULL) {
 331                 ret = ENOMEM;
 332                 goto out;
 333         }
 334
 335         if (hash && !(userAccountControl & UF_USE_DES_KEY_ONLY)) {
 336                 Key key;
 337
 338                 key.mkvno = 0;
 339                 key.salt = NULL; /* No salt for this enc type */
 340
 341                 ret = krb5_keyblock_init(context,
 342                                          ENCTYPE_ARCFOUR_HMAC_MD5,
 343                                          hash->hash, sizeof(hash->hash),
 344                                          &key.key);
 345                 if (ret) {
 346                         goto out;
 347                 }
 348
 349                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 350                 entry_ex->entry.keys.len++;
 351         }
 352
 353         if (pkb4) {
 354                 for (i=0; i < pkb4->num_keys; i++) {
 355                         bool use = true;
 356                         Key key;
 357
 358                         if (!pkb4->keys[i].value) continue;
 359
 360                         if (userAccountControl & UF_USE_DES_KEY_ONLY) {
 361                                 switch (pkb4->keys[i].keytype) {
 362                                 case ENCTYPE_DES_CBC_CRC:
 363                                 case ENCTYPE_DES_CBC_MD5:
 364                                         break;
 365                                 default:
 366                                         use = false;
 367                                         break;
 368                                 }
 369                         }
 370
 371                         if (!use) continue;
 372
 373                         key.mkvno = 0;
 374                         key.salt = NULL;
 375
 376                         if (pkb4->salt.string) {
 377                                 DATA_BLOB salt;
 378
 379                                 salt = data_blob_string_const(pkb4->salt.string);
 380
 381                                 key.salt = calloc(1, sizeof(*key.salt));
 382                                 if (key.salt == NULL) {
 383                                         ret = ENOMEM;
 384                                         goto out;
 385                                 }
 386
 387                                 key.salt->type = hdb_pw_salt;
 388
 389                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
 390                                 if (ret) {
 391                                         free(key.salt);
 392                                         key.salt = NULL;
 393                                         goto out;
 394                                 }
 395                         }
 396
 397                         /* TODO: maybe pass the iteration_count somehow... */
 398
 399                         ret = krb5_keyblock_init(context,
 400                                                  pkb4->keys[i].keytype,
 401                                                  pkb4->keys[i].value->data,
 402                                                  pkb4->keys[i].value->length,
 403                                                  &key.key);
 404                         if (ret) {
 405                                 if (key.salt) {
 406                                         free_Salt(key.salt);
 407                                         free(key.salt);
 408                                         key.salt = NULL;
 409                                 }
 410                                 goto out;
 411                         }
 412
 413                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 414                         entry_ex->entry.keys.len++;
 415                 }
 416         } else if (pkb3) {
 417                 for (i=0; i < pkb3->num_keys; i++) {
 418                         bool use = true;
 419                         Key key;
 420
 421                         if (!pkb3->keys[i].value) continue;
 422
 423                         if (userAccountControl & UF_USE_DES_KEY_ONLY) {
 424                                 switch (pkb3->keys[i].keytype) {
 425                                 case ENCTYPE_DES_CBC_CRC:
 426                                 case ENCTYPE_DES_CBC_MD5:
 427                                         break;
 428                                 default:
 429                                         use = false;
 430                                         break;
 431                                 }
 432                         }
 433
 434                         if (!use) continue;
 435
 436                         key.mkvno = 0;
 437                         key.salt = NULL;
 438
 439                         if (pkb3->salt.string) {
 440                                 DATA_BLOB salt;
 441
 442                                 salt = data_blob_string_const(pkb3->salt.string);
 443
 444                                 key.salt = calloc(1, sizeof(*key.salt));
 445                                 if (key.salt == NULL) {
 446                                         ret = ENOMEM;
 447                                         goto out;
 448                                 }
 449
 450                                 key.salt->type = hdb_pw_salt;
 451
 452                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
 453                                 if (ret) {
 454                                         free(key.salt);
 455                                         key.salt = NULL;
 456                                         goto out;
 457                                 }
 458                         }
 459
 460                         ret = krb5_keyblock_init(context,
 461                                                  pkb3->keys[i].keytype,
 462                                                  pkb3->keys[i].value->data,
 463                                                  pkb3->keys[i].value->length,
 464                                                  &key.key);
 465                         if (ret) {
 466                                 if (key.salt) {
 467                                         free_Salt(key.salt);
 468                                         free(key.salt);
 469                                         key.salt = NULL;
 470                                 }
 471                                 goto out;
 472                         }
 473
 474                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 475                         entry_ex->entry.keys.len++;
 476                 }
 477         }
 478
 479 out:
 480         if (ret != 0) {
 481                 entry_ex->entry.keys.len = 0;
 482         }
 483         if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
 484                 free(entry_ex->entry.keys.val);
 485                 entry_ex->entry.keys.val = NULL;
 486         }
 487         return ret;
 488 }
 489
 490 /*
 491  * Construct an hdb_entry from a directory entry.
 492  */
 493 static krb5_error_code LDB_message2entry(krb5_context context, HDB *db,
 494                                          TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 495                                          enum hdb_ldb_ent_type ent_type,
 496                                          struct ldb_message *msg,
 497                                          struct ldb_message *realm_ref_msg,
 498                                          hdb_entry_ex *entry_ex)
 499 {
 500         unsigned int userAccountControl;
 501         int i;
 502         krb5_error_code ret = 0;
 503         krb5_boolean is_computer = FALSE;
 504         const char *dnsdomain = ldb_msg_find_attr_as_string(realm_ref_msg, "dnsRoot", NULL);
 505         char *realm = strupper_talloc(mem_ctx, dnsdomain);
 506         struct loadparm_context *lp_ctx = ldb_get_opaque((struct ldb_context *)db->hdb_db, "loadparm");
 507         struct ldb_dn *domain_dn = samdb_result_dn((struct ldb_context *)db->hdb_db,
 508                                                         mem_ctx,
 509                                                         realm_ref_msg,
 510                                                         "nCName",
 511                                                         ldb_dn_new(mem_ctx, (struct ldb_context *)db->hdb_db, NULL));
 512
 513         struct hdb_ldb_private *private;
 514         NTTIME acct_expiry;
 515
 516         struct ldb_message_element *objectclasses;
 517         struct ldb_val computer_val;
 518         computer_val.data = discard_const_p(uint8_t,"computer");
 519         computer_val.length = strlen((const char *)computer_val.data);
 520
 521         objectclasses = ldb_msg_find_element(msg, "objectClass");
 522
 523         if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
 524                 is_computer = TRUE;
 525         }
 526
 527         memset(entry_ex, 0, sizeof(*entry_ex));
 528
 529         if (!realm) {
 530                 krb5_set_error_string(context, "talloc_strdup: out of memory");
 531                 ret = ENOMEM;
 532                 goto out;
 533         }
 534
 535         private = talloc(mem_ctx, struct hdb_ldb_private);
 536         if (!private) {
 537                 ret = ENOMEM;
 538                 goto out;
 539         }
 540
 541         private->entry_ex = entry_ex;
 542         private->iconv_convenience = lp_iconv_convenience(lp_ctx);
 543         private->netbios_name = lp_netbios_name(lp_ctx);
 544
 545         talloc_set_destructor(private, hdb_ldb_destrutor);
 546
 547         entry_ex->ctx = private;
 548         entry_ex->free_entry = hdb_ldb_free_entry;
 549
 550         userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
 551
 552
 553         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 554         if (ent_type == HDB_LDB_ENT_TYPE_ANY && principal == NULL) {
 555                 const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
 556                 if (!samAccountName) {
 557                         krb5_set_error_string(context, "LDB_message2entry: no samAccountName present");
 558                         ret = ENOENT;
 559                         goto out;
 560                 }
 561                 samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
 562                 krb5_make_principal(context, &entry_ex->entry.principal, realm, samAccountName, NULL);
 563         } else {
 564                 char *strdup_realm;
 565                 ret = copy_Principal(principal, entry_ex->entry.principal);
 566                 if (ret) {
 567                         krb5_clear_error_string(context);
 568                         goto out;
 569                 }
 570
 571                 /* While we have copied the client principal, tests
 572                  * show that Win2k3 returns the 'corrected' realm, not
 573                  * the client-specified realm.  This code attempts to
 574                  * replace the client principal's realm with the one
 575                  * we determine from our records */
 576
 577                 /* this has to be with malloc() */
 578                 strdup_realm = strdup(realm);
 579                 if (!strdup_realm) {
 580                         ret = ENOMEM;
 581                         krb5_clear_error_string(context);
 582                         goto out;
 583                 }
 584                 free(*krb5_princ_realm(context, entry_ex->entry.principal));
 585                 krb5_princ_set_realm(context, entry_ex->entry.principal, &strdup_realm);
 586         }
 587
 588         entry_ex->entry.flags = uf2HDBFlags(context, userAccountControl, ent_type);
 589
 590         if (ent_type == HDB_LDB_ENT_TYPE_KRBTGT) {
 591                 entry_ex->entry.flags.invalid = 0;
 592                 entry_ex->entry.flags.server = 1;
 593                 entry_ex->entry.flags.forwardable = 1;
 594                 entry_ex->entry.flags.ok_as_delegate = 1;
 595         }
 596
 597         if (lp_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
 598                 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
 599                         entry_ex->entry.flags.server = 0;
 600                 }
 601         }
 602
 603         /* use 'whenCreated' */
 604         entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 605         /* use '???' */
 606         entry_ex->entry.created_by.principal = NULL;
 607
 608         entry_ex->entry.modified_by = (Event *) malloc(sizeof(Event));
 609         if (entry_ex->entry.modified_by == NULL) {
 610                 krb5_set_error_string(context, "malloc: out of memory");
 611                 ret = ENOMEM;
 612                 goto out;
 613         }
 614
 615         /* use 'whenChanged' */
 616         entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
 617         /* use '???' */
 618         entry_ex->entry.modified_by->principal = NULL;
 619
 620         entry_ex->entry.valid_start = NULL;
 621
 622         acct_expiry = samdb_result_account_expires(msg);
 623         if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
 624                 entry_ex->entry.valid_end = NULL;
 625         } else {
 626                 entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
 627                 if (entry_ex->entry.valid_end == NULL) {
 628                         ret = ENOMEM;
 629                         goto out;
 630                 }
 631                 *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
 632         }
 633
 634         if (ent_type != HDB_LDB_ENT_TYPE_KRBTGT) {
 635                 NTTIME must_change_time
 636                         = samdb_result_force_password_change((struct ldb_context *)db->hdb_db, mem_ctx,
 637                                                              domain_dn, msg);
 638                 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
 639                         entry_ex->entry.pw_end = NULL;
 640                 } else {
 641                         entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
 642                         if (entry_ex->entry.pw_end == NULL) {
 643                                 ret = ENOMEM;
 644                                 goto out;
 645                         }
 646                         *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
 647                 }
 648         } else {
 649                 entry_ex->entry.pw_end = NULL;
 650         }
 651
 652         entry_ex->entry.max_life = NULL;
 653
 654         entry_ex->entry.max_renew = NULL;
 655
 656         entry_ex->entry.generation = NULL;
 657
 658         /* Get keys from the db */
 659         ret = LDB_message2entry_keys(context, private->iconv_convenience, private, msg, userAccountControl, entry_ex);
 660         if (ret) {
 661                 /* Could be bougus data in the entry, or out of memory */
 662                 goto out;
 663         }
 664
 665         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 666         if (entry_ex->entry.etypes == NULL) {
 667                 krb5_clear_error_string(context);
 668                 ret = ENOMEM;
 669                 goto out;
 670         }
 671         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 672         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 673         if (entry_ex->entry.etypes->val == NULL) {
 674                 krb5_clear_error_string(context);
 675                 ret = ENOMEM;
 676                 goto out;
 677         }
 678         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 679                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 680         }
 681
 682
 683         private->msg = talloc_steal(private, msg);
 684         private->realm_ref_msg = talloc_steal(private, realm_ref_msg);
 685         private->samdb = (struct ldb_context *)db->hdb_db;
 686
 687 out:
 688         if (ret != 0) {
 689                 /* This doesn't free ent itself, that is for the eventual caller to do */
 690                 hdb_free_entry(context, entry_ex);
 691         } else {
 692                 talloc_steal(db, entry_ex->ctx);
 693         }
 694
 695         return ret;
 696 }
 697
 698 /*
 699  * Construct an hdb_entry from a directory entry.
 700  */
 701 static krb5_error_code LDB_trust_message2entry(krb5_context context, HDB *db,
 702                                                struct loadparm_context *lp_ctx,
 703                                                TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 704                                                enum trust_direction direction,
 705                                                struct ldb_message *msg,
 706                                                hdb_entry_ex *entry_ex)
 707 {
 708
 709         const char *dnsdomain;
 710         char *realm;
 711         char *strdup_realm;
 712         DATA_BLOB password_utf16;
 713         struct samr_Password password_hash;
 714         const struct ldb_val *password_val;
 715         struct trustAuthInOutBlob password_blob;
 716         struct hdb_ldb_private *private;
 717
 718         enum ndr_err_code ndr_err;
 719         int i, ret, trust_direction_flags;
 720
 721         private = talloc(mem_ctx, struct hdb_ldb_private);
 722         if (!private) {
 723                 ret = ENOMEM;
 724                 goto out;
 725         }
 726
 727         private->entry_ex = entry_ex;
 728         private->iconv_convenience = lp_iconv_convenience(lp_ctx);
 729         private->netbios_name = lp_netbios_name(lp_ctx);
 730
 731         talloc_set_destructor(private, hdb_ldb_destrutor);
 732
 733         entry_ex->ctx = private;
 734         entry_ex->free_entry = hdb_ldb_free_entry;
 735
 736         /* use 'whenCreated' */
 737         entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 738         /* use '???' */
 739         entry_ex->entry.created_by.principal = NULL;
 740
 741         entry_ex->entry.valid_start = NULL;
 742
 743         trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
 744
 745         if (direction == INBOUND) {
 746                 realm = strupper_talloc(mem_ctx, lp_realm(lp_ctx));
 747                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
 748
 749         } else { /* OUTBOUND */
 750                 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
 751                 realm = strupper_talloc(mem_ctx, dnsdomain);
 752                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
 753         }
 754
 755         if (!password_val || !(trust_direction_flags & direction)) {
 756                 ret = ENOENT;
 757                 goto out;
 758         }
 759
 760         ndr_err = ndr_pull_struct_blob_all(password_val, mem_ctx, private->iconv_convenience, &password_blob,
 761                                            (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
 762         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 763                 ret = EINVAL;
 764                 goto out;
 765         }
 766
 767         for (i=0; i < password_blob.count; i++) {
 768                 if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
 769                         password_utf16 = data_blob_const(password_blob.current->array[i].AuthInfo.clear.password,
 770                                                          password_blob.current->array[i].AuthInfo.clear.size);
 771                         /* In the future, generate all sorts of
 772                          * hashes, but for now we can't safely convert
 773                          * the random strings windows uses into
 774                          * utf8 */
 775
 776                         /* but as it is utf16 already, we can get the NT password/arcfour-hmac-md5 key */
 777                         mdfour(password_hash.hash, password_utf16.data, password_utf16.length);
 778                         break;
 779                 } else if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
 780                         password_hash = password_blob.current->array[i].AuthInfo.nt4owf.password;
 781                         break;
 782                 }
 783         }
 784         entry_ex->entry.keys.len = 0;
 785         entry_ex->entry.keys.val = NULL;
 786
 787         if (i < password_blob.count) {
 788                 Key key;
 789                 /* Must have found a cleartext or MD4 password */
 790                 entry_ex->entry.keys.val = calloc(1, sizeof(Key));
 791
 792                 key.mkvno = 0;
 793                 key.salt = NULL; /* No salt for this enc type */
 794
 795                 if (entry_ex->entry.keys.val == NULL) {
 796                         ret = ENOMEM;
 797                         goto out;
 798                 }
 799
 800                 ret = krb5_keyblock_init(context,
 801                                          ENCTYPE_ARCFOUR_HMAC_MD5,
 802                                          password_hash.hash, sizeof(password_hash.hash),
 803                                          &key.key);
 804
 805                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 806                 entry_ex->entry.keys.len++;
 807         }
 808
 809         ret = copy_Principal(principal, entry_ex->entry.principal);
 810         if (ret) {
 811                 krb5_clear_error_string(context);
 812                 goto out;
 813         }
 814
 815         /* While we have copied the client principal, tests
 816          * show that Win2k3 returns the 'corrected' realm, not
 817          * the client-specified realm.  This code attempts to
 818          * replace the client principal's realm with the one
 819          * we determine from our records */
 820
 821         /* this has to be with malloc() */
 822         strdup_realm = strdup(realm);
 823         if (!strdup_realm) {
 824                 ret = ENOMEM;
 825                 krb5_clear_error_string(context);
 826                 goto out;
 827         }
 828         free(*krb5_princ_realm(context, entry_ex->entry.principal));
 829         krb5_princ_set_realm(context, entry_ex->entry.principal, &strdup_realm);
 830
 831         entry_ex->entry.flags = int2HDBFlags(0);
 832         entry_ex->entry.flags.immutable = 1;
 833         entry_ex->entry.flags.invalid = 0;
 834         entry_ex->entry.flags.server = 1;
 835         entry_ex->entry.flags.require_preauth = 1;
 836
 837         entry_ex->entry.pw_end = NULL;
 838
 839         entry_ex->entry.max_life = NULL;
 840
 841         entry_ex->entry.max_renew = NULL;
 842
 843         entry_ex->entry.generation = NULL;
 844
 845         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 846         if (entry_ex->entry.etypes == NULL) {
 847                 krb5_clear_error_string(context);
 848                 ret = ENOMEM;
 849                 goto out;
 850         }
 851         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 852         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 853         if (entry_ex->entry.etypes->val == NULL) {
 854                 krb5_clear_error_string(context);
 855                 ret = ENOMEM;
 856                 goto out;
 857         }
 858         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 859                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 860         }
 861
 862
 863         private->msg = talloc_steal(private, msg);
 864         private->realm_ref_msg = NULL;
 865         private->samdb = (struct ldb_context *)db->hdb_db;
 866
 867 out:
 868         if (ret != 0) {
 869                 /* This doesn't free ent itself, that is for the eventual caller to do */
 870                 hdb_free_entry(context, entry_ex);
 871         } else {
 872                 talloc_steal(db, entry_ex->ctx);
 873         }
 874
 875         return ret;
 876
 877 }
 878
 879 static krb5_error_code LDB_lookup_principal(krb5_context context, struct ldb_context *ldb_ctx,
 880                                             TALLOC_CTX *mem_ctx,
 881                                             krb5_const_principal principal,
 882                                             enum hdb_ldb_ent_type ent_type,
 883                                             struct ldb_dn *realm_dn,
 884                                             struct ldb_message ***pmsg)
 885 {
 886         krb5_error_code ret;
 887         int lret;
 888         char *filter = NULL;
 889         const char * const *princ_attrs = user_attrs;
 890
 891         char *short_princ;
 892         char *short_princ_talloc;
 893
 894         struct ldb_result *res = NULL;
 895
 896         ret = krb5_unparse_name_flags(context, principal,  KRB5_PRINCIPAL_UNPARSE_NO_REALM, &short_princ);
 897
 898         if (ret != 0) {
 899                 krb5_set_error_string(context, "LDB_lookup_principal: could not parse principal");
 900                 krb5_warnx(context, "LDB_lookup_principal: could not parse principal");
 901                 return ret;
 902         }
 903
 904         short_princ_talloc = talloc_strdup(mem_ctx, short_princ);
 905         free(short_princ);
 906         if (!short_princ_talloc) {
 907                 krb5_set_error_string(context, "LDB_lookup_principal: talloc_strdup() failed!");
 908                 return ENOMEM;
 909         }
 910
 911         switch (ent_type) {
 912         case HDB_LDB_ENT_TYPE_CLIENT:
 913         case HDB_LDB_ENT_TYPE_TRUST:
 914         case HDB_LDB_ENT_TYPE_ANY:
 915                 /* Can't happen */
 916                 return EINVAL;
 917         case HDB_LDB_ENT_TYPE_KRBTGT:
 918                 filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(samAccountName=%s))",
 919                                          KRB5_TGS_NAME);
 920                 break;
 921         case HDB_LDB_ENT_TYPE_SERVER:
 922                 filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(samAccountName=%s))",
 923                                          short_princ_talloc);
 924                 break;
 925         }
 926
 927         if (!filter) {
 928                 krb5_set_error_string(context, "talloc_asprintf: out of memory");
 929                 return ENOMEM;
 930         }
 931
 932         lret = ldb_search(ldb_ctx, mem_ctx, &res, realm_dn,
 933                           LDB_SCOPE_SUBTREE, princ_attrs, "%s", filter);
 934         if (lret != LDB_SUCCESS) {
 935                 DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx)));
 936                 return HDB_ERR_NOENTRY;
 937         } else if (res->count == 0 || res->count > 1) {
 938                 DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count));
 939                 talloc_free(res);
 940                 return HDB_ERR_NOENTRY;
 941         }
 942         talloc_steal(mem_ctx, res->msgs);
 943         *pmsg = res->msgs;
 944         talloc_free(res);
 945         return 0;
 946 }
 947
 948 static krb5_error_code LDB_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
 949                                         TALLOC_CTX *mem_ctx,
 950                                         const char *realm,
 951                                         struct ldb_dn *realm_dn,
 952                                         struct ldb_message ***pmsg)
 953 {
 954         int lret;
 955         char *filter = NULL;
 956         const char * const *attrs = trust_attrs;
 957
 958         struct ldb_result *res = NULL;
 959         filter = talloc_asprintf(mem_ctx, "(&(objectClass=trustedDomain)(|(flatname=%s)(trustPartner=%s)))", realm, realm);
 960
 961         if (!filter) {
 962                 krb5_set_error_string(context, "talloc_asprintf: out of memory");
 963                 return ENOMEM;
 964         }
 965
 966         lret = ldb_search(ldb_ctx, mem_ctx, &res,
 967                           ldb_get_default_basedn(ldb_ctx),
 968                           LDB_SCOPE_SUBTREE, attrs, "%s", filter);
 969         if (lret != LDB_SUCCESS) {
 970                 DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx)));
 971                 return HDB_ERR_NOENTRY;
 972         } else if (res->count == 0 || res->count > 1) {
 973                 DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count));
 974                 talloc_free(res);
 975                 return HDB_ERR_NOENTRY;
 976         }
 977         talloc_steal(mem_ctx, res->msgs);
 978         *pmsg = res->msgs;
 979         talloc_free(res);
 980         return 0;
 981 }
 982
 983 static krb5_error_code LDB_lookup_realm(krb5_context context, struct ldb_context *ldb_ctx,
 984                                         TALLOC_CTX *mem_ctx,
 985                                         const char *realm,
 986                                         struct ldb_message ***pmsg)
 987 {
 988         int ret;
 989         struct ldb_result *cross_ref_res;
 990         struct ldb_dn *partitions_basedn = samdb_partitions_dn(ldb_ctx, mem_ctx);
 991
 992         ret = ldb_search(ldb_ctx, mem_ctx, &cross_ref_res,
 993                         partitions_basedn, LDB_SCOPE_SUBTREE, realm_ref_attrs,
 994                         "(&(&(|(&(dnsRoot=%s)(nETBIOSName=*))(nETBIOSName=%s))(objectclass=crossRef))(ncName=*))",
 995                         realm, realm);
 996
 997         if (ret != LDB_SUCCESS) {
 998                 DEBUG(3, ("Failed to search to lookup realm(%s): %s\n", realm, ldb_errstring(ldb_ctx)));
 999                 talloc_free(cross_ref_res);
1000                 return HDB_ERR_NOENTRY;
1001         } else if (cross_ref_res->count == 0 || cross_ref_res->count > 1) {
1002                 DEBUG(3, ("Failed find a single entry for realm %s: got %d\n", realm, cross_ref_res->count));
1003                 talloc_free(cross_ref_res);
1004                 return HDB_ERR_NOENTRY;
1005         }
1006
1007         if (pmsg) {
1008                 *pmsg = cross_ref_res->msgs;
1009                 talloc_steal(mem_ctx, cross_ref_res->msgs);
1010         }
1011         talloc_free(cross_ref_res);
1012
1013         return 0;
1014 }
1015
1016
1017 static krb5_error_code LDB_open(krb5_context context, HDB *db, int flags, mode_t mode)
1018 {
1019         if (db->hdb_master_key_set) {
1020                 krb5_warnx(context, "LDB_open: use of a master key incompatible with LDB\n");
1021                 krb5_set_error_string(context, "LDB_open: use of a master key incompatible with LDB\n");
1022                 return HDB_ERR_NOENTRY;
1023         }
1024
1025         return 0;
1026 }
1027
1028 static krb5_error_code LDB_close(krb5_context context, HDB *db)
1029 {
1030         return 0;
1031 }
1032
1033 static krb5_error_code LDB_lock(krb5_context context, HDB *db, int operation)
1034 {
1035         return 0;
1036 }
1037
1038 static krb5_error_code LDB_unlock(krb5_context context, HDB *db)
1039 {
1040         return 0;
1041 }
1042
1043 static krb5_error_code LDB_rename(krb5_context context, HDB *db, const char *new_name)
1044 {
1045         return HDB_ERR_DB_INUSE;
1046 }
1047
1048 static krb5_error_code LDB_fetch_client(krb5_context context, HDB *db,
1049                                         TALLOC_CTX *mem_ctx,
1050                                         krb5_const_principal principal,
1051                                         unsigned flags,
1052                                         hdb_entry_ex *entry_ex) {
1053         NTSTATUS nt_status;
1054         char *principal_string;
1055         krb5_error_code ret;
1056         struct ldb_message **msg = NULL;
1057         struct ldb_message **realm_ref_msg = NULL;
1058
1059         ret = krb5_unparse_name(context, principal, &principal_string);
1060
1061         if (ret != 0) {
1062                 return ret;
1063         }
1064
1065         nt_status = sam_get_results_principal((struct ldb_context *)db->hdb_db,
1066                                               mem_ctx, principal_string,
1067                                               &msg, &realm_ref_msg);
1068         free(principal_string);
1069         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1070                 return HDB_ERR_NOENTRY;
1071         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1072                 return ENOMEM;
1073         } else if (!NT_STATUS_IS_OK(nt_status)) {
1074                 return EINVAL;
1075         }
1076
1077         ret = LDB_message2entry(context, db, mem_ctx,
1078                                 principal, HDB_LDB_ENT_TYPE_CLIENT,
1079                                 msg[0], realm_ref_msg[0], entry_ex);
1080         return ret;
1081 }
1082
1083 static krb5_error_code LDB_fetch_krbtgt(krb5_context context, HDB *db,
1084                                         TALLOC_CTX *mem_ctx,
1085                                         krb5_const_principal principal,
1086                                         unsigned flags,
1087                                         hdb_entry_ex *entry_ex)
1088 {
1089         krb5_error_code ret;
1090         struct ldb_message **msg = NULL;
1091         struct ldb_message **realm_ref_msg_1 = NULL;
1092         struct ldb_message **realm_ref_msg_2 = NULL;
1093         struct ldb_dn *realm_dn;
1094         const char *realm;
1095
1096         krb5_principal alloc_principal = NULL;
1097         if (principal->name.name_string.len != 2
1098             || (strcmp(principal->name.name_string.val[0], KRB5_TGS_NAME) != 0)) {
1099                 /* Not a krbtgt */
1100                 return HDB_ERR_NOENTRY;
1101         }
1102
1103         /* krbtgt case.  Either us or a trusted realm */
1104
1105         if ((LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db,
1106                               mem_ctx, principal->realm, &realm_ref_msg_1) == 0)
1107             && (LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db,
1108                                  mem_ctx, principal->name.name_string.val[1], &realm_ref_msg_2) == 0)
1109             && (ldb_dn_compare(realm_ref_msg_1[0]->dn, realm_ref_msg_1[0]->dn) == 0)) {
1110                 /* us */
1111                 /* Cludge, cludge cludge.  If the realm part of krbtgt/realm,
1112                  * is in our db, then direct the caller at our primary
1113                  * krbtgt */
1114
1115                 const char *dnsdomain = ldb_msg_find_attr_as_string(realm_ref_msg_1[0], "dnsRoot", NULL);
1116                 char *realm_fixed = strupper_talloc(mem_ctx, dnsdomain);
1117                 if (!realm_fixed) {
1118                         krb5_set_error_string(context, "strupper_talloc: out of memory");
1119                         return ENOMEM;
1120                 }
1121
1122                 ret = krb5_copy_principal(context, principal, &alloc_principal);
1123                 if (ret) {
1124                         return ret;
1125                 }
1126
1127                 free(alloc_principal->name.name_string.val[1]);
1128                 alloc_principal->name.name_string.val[1] = strdup(realm_fixed);
1129                 talloc_free(realm_fixed);
1130                 if (!alloc_principal->name.name_string.val[1]) {
1131                         krb5_set_error_string(context, "LDB_fetch: strdup() failed!");
1132                         return ENOMEM;
1133                 }
1134                 principal = alloc_principal;
1135                 realm_dn = samdb_result_dn((struct ldb_context *)db->hdb_db, mem_ctx, realm_ref_msg_1[0], "nCName", NULL);
1136
1137                 ret = LDB_lookup_principal(context, (struct ldb_context *)db->hdb_db,
1138                                            mem_ctx,
1139                                            principal, HDB_LDB_ENT_TYPE_KRBTGT, realm_dn, &msg);
1140
1141                 if (ret != 0) {
1142                         krb5_warnx(context, "LDB_fetch: could not find principal in DB");
1143                         krb5_set_error_string(context, "LDB_fetch: could not find principal in DB");
1144                         return ret;
1145                 }
1146
1147                 ret = LDB_message2entry(context, db, mem_ctx,
1148                                         principal, HDB_LDB_ENT_TYPE_KRBTGT,
1149                                         msg[0], realm_ref_msg_1[0], entry_ex);
1150                 if (ret != 0) {
1151                         krb5_warnx(context, "LDB_fetch: message2entry failed");
1152                 }
1153                 return ret;
1154
1155         } else {
1156                 enum trust_direction direction = UNKNOWN;
1157
1158                 struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(db->hdb_db, "loadparm"), struct loadparm_context);
1159                 /* Either an inbound or outbound trust */
1160
1161                 if (strcasecmp(lp_realm(lp_ctx), principal->realm) == 0) {
1162                         /* look for inbound trust */
1163                         direction = INBOUND;
1164                         realm = principal->name.name_string.val[1];
1165                 }
1166
1167                 if (strcasecmp(lp_realm(lp_ctx), principal->name.name_string.val[1]) == 0) {
1168                         /* look for outbound trust */
1169                         direction = OUTBOUND;
1170                         realm = principal->realm;
1171                 }
1172
1173                 /* Trusted domains are under CN=system */
1174
1175                 ret = LDB_lookup_trust(context, (struct ldb_context *)db->hdb_db,
1176                                        mem_ctx,
1177                                        realm, realm_dn, &msg);
1178
1179                 if (ret != 0) {
1180                         krb5_warnx(context, "LDB_fetch: could not find principal in DB");
1181                         krb5_set_error_string(context, "LDB_fetch: could not find principal in DB");
1182                         return ret;
1183                 }
1184
1185                 ret = LDB_trust_message2entry(context, db, lp_ctx, mem_ctx,
1186                                               principal, direction,
1187                                               msg[0], entry_ex);
1188                 if (ret != 0) {
1189                         krb5_warnx(context, "LDB_fetch: message2entry failed");
1190                 }
1191                 return ret;
1192
1193
1194                 /* we should lookup trusted domains */
1195                 return HDB_ERR_NOENTRY;
1196         }
1197
1198 }
1199
1200 static krb5_error_code LDB_fetch_server(krb5_context context, HDB *db,
1201                                         TALLOC_CTX *mem_ctx,
1202                                         krb5_const_principal principal,
1203                                         unsigned flags,
1204                                         hdb_entry_ex *entry_ex)
1205 {
1206         krb5_error_code ret;
1207         const char *realm;
1208         struct ldb_message **msg = NULL;
1209         struct ldb_message **realm_ref_msg = NULL;
1210         struct ldb_dn *partitions_basedn = samdb_partitions_dn(db->hdb_db, mem_ctx);
1211         if (principal->name.name_string.len >= 2) {
1212                 /* 'normal server' case */
1213                 int ldb_ret;
1214                 NTSTATUS nt_status;
1215                 struct ldb_dn *user_dn, *domain_dn;
1216                 char *principal_string;
1217
1218                 ret = krb5_unparse_name_flags(context, principal,
1219                                               KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1220                                               &principal_string);
1221                 if (ret != 0) {
1222                         return ret;
1223                 }
1224
1225                 /* At this point we may find the host is known to be
1226                  * in a different realm, so we should generate a
1227                  * referral instead */
1228                 nt_status = crack_service_principal_name((struct ldb_context *)db->hdb_db,
1229                                                          mem_ctx, principal_string,
1230                                                          &user_dn, &domain_dn);
1231                 free(principal_string);
1232
1233                 if (!NT_STATUS_IS_OK(nt_status)) {
1234                         return HDB_ERR_NOENTRY;
1235                 }
1236
1237                 ldb_ret = gendb_search_dn((struct ldb_context *)db->hdb_db,
1238                                           mem_ctx, user_dn, &msg, user_attrs);
1239
1240                 if (ldb_ret != 1) {
1241                         return HDB_ERR_NOENTRY;
1242                 }
1243
1244                 ldb_ret = gendb_search((struct ldb_context *)db->hdb_db,
1245                                        mem_ctx, partitions_basedn, &realm_ref_msg, realm_ref_attrs,
1246                                        "ncName=%s", ldb_dn_get_linearized(domain_dn));
1247
1248                 if (ldb_ret != 1) {
1249                         return HDB_ERR_NOENTRY;
1250                 }
1251
1252         } else {
1253                 struct ldb_dn *realm_dn;
1254                 /* server as client principal case, but we must not lookup userPrincipalNames */
1255
1256                 realm = krb5_principal_get_realm(context, principal);
1257
1258                 ret = LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db,
1259                                        mem_ctx, realm, &realm_ref_msg);
1260                 if (ret != 0) {
1261                         return HDB_ERR_NOENTRY;
1262                 }
1263
1264                 realm_dn = samdb_result_dn((struct ldb_context *)db->hdb_db, mem_ctx, realm_ref_msg[0], "nCName", NULL);
1265
1266                 ret = LDB_lookup_principal(context, (struct ldb_context *)db->hdb_db,
1267                                            mem_ctx,
1268                                            principal, HDB_LDB_ENT_TYPE_SERVER, realm_dn, &msg);
1269
1270                 if (ret != 0) {
1271                         return ret;
1272                 }
1273         }
1274
1275         ret = LDB_message2entry(context, db, mem_ctx,
1276                                 principal, HDB_LDB_ENT_TYPE_SERVER,
1277                                 msg[0], realm_ref_msg[0], entry_ex);
1278         if (ret != 0) {
1279                 krb5_warnx(context, "LDB_fetch: message2entry failed");
1280         }
1281
1282         return ret;
1283 }
1284
1285 static krb5_error_code LDB_fetch(krb5_context context, HDB *db,
1286                                  krb5_const_principal principal,
1287                                  unsigned flags,
1288                                  hdb_entry_ex *entry_ex)
1289 {
1290         krb5_error_code ret = HDB_ERR_NOENTRY;
1291
1292         TALLOC_CTX *mem_ctx = talloc_named(db, 0, "LDB_fetch context");
1293
1294         if (!mem_ctx) {
1295                 krb5_set_error_string(context, "LDB_fetch: talloc_named() failed!");
1296                 return ENOMEM;
1297         }
1298
1299         if (flags & HDB_F_GET_CLIENT) {
1300                 ret = LDB_fetch_client(context, db, mem_ctx, principal, flags, entry_ex);
1301                 if (ret != HDB_ERR_NOENTRY) goto done;
1302         }
1303         if (flags & HDB_F_GET_SERVER) {
1304                 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
1305                 ret = LDB_fetch_krbtgt(context, db, mem_ctx, principal, flags, entry_ex);
1306                 if (ret != HDB_ERR_NOENTRY) goto done;
1307
1308                 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
1309                 ret = LDB_fetch_server(context, db, mem_ctx, principal, flags, entry_ex);
1310                 if (ret != HDB_ERR_NOENTRY) goto done;
1311         }
1312         if (flags & HDB_F_GET_KRBTGT) {
1313                 ret = LDB_fetch_krbtgt(context, db, mem_ctx, principal, flags, entry_ex);
1314                 if (ret != HDB_ERR_NOENTRY) goto done;
1315         }
1316
1317 done:
1318         talloc_free(mem_ctx);
1319         return ret;
1320 }
1321
1322 static krb5_error_code LDB_store(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
1323 {
1324         return HDB_ERR_DB_INUSE;
1325 }
1326
1327 static krb5_error_code LDB_remove(krb5_context context, HDB *db, krb5_const_principal principal)
1328 {
1329         return HDB_ERR_DB_INUSE;
1330 }
1331
1332 struct hdb_ldb_seq {
1333         struct ldb_context *ctx;
1334         int index;
1335         int count;
1336         struct ldb_message **msgs;
1337         struct ldb_message **realm_ref_msgs;
1338 };
1339
1340 static krb5_error_code LDB_seq(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
1341 {
1342         krb5_error_code ret;
1343         struct hdb_ldb_seq *priv = (struct hdb_ldb_seq *)db->hdb_dbc;
1344         TALLOC_CTX *mem_ctx;
1345         hdb_entry_ex entry_ex;
1346         memset(&entry_ex, '\0', sizeof(entry_ex));
1347
1348         if (!priv) {
1349                 return HDB_ERR_NOENTRY;
1350         }
1351
1352         mem_ctx = talloc_named(priv, 0, "LDB_seq context");
1353
1354         if (!mem_ctx) {
1355                 krb5_set_error_string(context, "LDB_seq: talloc_named() failed!");
1356                 return ENOMEM;
1357         }
1358
1359         if (priv->index < priv->count) {
1360                 ret = LDB_message2entry(context, db, mem_ctx,
1361                                         NULL, HDB_LDB_ENT_TYPE_ANY,
1362                                         priv->msgs[priv->index++],
1363                                         priv->realm_ref_msgs[0], entry);
1364         } else {
1365                 ret = HDB_ERR_NOENTRY;
1366         }
1367
1368         if (ret != 0) {
1369                 talloc_free(priv);
1370                 db->hdb_dbc = NULL;
1371         } else {
1372                 talloc_free(mem_ctx);
1373         }
1374
1375         return ret;
1376 }
1377
1378 static krb5_error_code LDB_firstkey(krb5_context context, HDB *db, unsigned flags,
1379                                         hdb_entry_ex *entry)
1380 {
1381         struct ldb_context *ldb_ctx = (struct ldb_context *)db->hdb_db;
1382         struct hdb_ldb_seq *priv = (struct hdb_ldb_seq *)db->hdb_dbc;
1383         char *realm;
1384         struct ldb_dn *realm_dn = NULL;
1385         struct ldb_result *res = NULL;
1386         struct ldb_message **realm_ref_msgs = NULL;
1387         krb5_error_code ret;
1388         TALLOC_CTX *mem_ctx;
1389         int lret;
1390
1391         if (priv) {
1392                 talloc_free(priv);
1393                 db->hdb_dbc = NULL;
1394         }
1395
1396         priv = (struct hdb_ldb_seq *) talloc(db, struct hdb_ldb_seq);
1397         if (!priv) {
1398                 krb5_set_error_string(context, "talloc: out of memory");
1399                 return ENOMEM;
1400         }
1401
1402         priv->ctx = ldb_ctx;
1403         priv->index = 0;
1404         priv->msgs = NULL;
1405         priv->realm_ref_msgs = NULL;
1406         priv->count = 0;
1407
1408         mem_ctx = talloc_named(priv, 0, "LDB_firstkey context");
1409
1410         if (!mem_ctx) {
1411                 krb5_set_error_string(context, "LDB_firstkey: talloc_named() failed!");
1412                 return ENOMEM;
1413         }
1414
1415         ret = krb5_get_default_realm(context, &realm);
1416         if (ret != 0) {
1417                 talloc_free(priv);
1418                 return ret;
1419         }
1420
1421         ret = LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db,
1422                                mem_ctx, realm, &realm_ref_msgs);
1423
1424         free(realm);
1425
1426         if (ret != 0) {
1427                 talloc_free(priv);
1428                 krb5_warnx(context, "LDB_firstkey: could not find realm\n");
1429                 return HDB_ERR_NOENTRY;
1430         }
1431
1432         realm_dn = samdb_result_dn((struct ldb_context *)db->hdb_db, mem_ctx, realm_ref_msgs[0], "nCName", NULL);
1433
1434         priv->realm_ref_msgs = talloc_steal(priv, realm_ref_msgs);
1435
1436         lret = ldb_search(ldb_ctx, priv, &res,
1437                           realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
1438                           "(objectClass=user)");
1439
1440         if (lret != LDB_SUCCESS) {
1441                 talloc_free(priv);
1442                 return HDB_ERR_NOENTRY;
1443         }
1444
1445         priv->count = res->count;
1446         priv->msgs = talloc_steal(priv, res->msgs);
1447         talloc_free(res);
1448
1449         db->hdb_dbc = priv;
1450
1451         ret = LDB_seq(context, db, flags, entry);
1452
1453         if (ret != 0) {
1454                 talloc_free(priv);
1455                 db->hdb_dbc = NULL;
1456         } else {
1457                 talloc_free(mem_ctx);
1458         }
1459         return ret;
1460 }
1461
1462 static krb5_error_code LDB_nextkey(krb5_context context, HDB *db, unsigned flags,
1463                                    hdb_entry_ex *entry)
1464 {
1465         return LDB_seq(context, db, flags, entry);
1466 }
1467
1468 static krb5_error_code LDB_destroy(krb5_context context, HDB *db)
1469 {
1470         talloc_free(db);
1471         return 0;
1472 }
1473
1474 /* This interface is to be called by the KDC, which is expecting Samba
1475  * calling conventions.  It is also called by a wrapper
1476  * (hdb_ldb_create) from the kpasswdd -> krb5 -> keytab_hdb -> hdb
1477  * code */
1478
1479 NTSTATUS kdc_hdb_ldb_create(TALLOC_CTX *mem_ctx,
1480                             struct event_context *ev_ctx,
1481                             struct loadparm_context *lp_ctx,
1482                             krb5_context context, struct HDB **db, const char *arg)
1483 {
1484         NTSTATUS nt_status;
1485         struct auth_session_info *session_info;
1486         *db = talloc(mem_ctx, HDB);
1487         if (!*db) {
1488                 krb5_set_error_string(context, "malloc: out of memory");
1489                 return NT_STATUS_NO_MEMORY;
1490         }
1491
1492         (*db)->hdb_master_key_set = 0;
1493         (*db)->hdb_db = NULL;
1494
1495         nt_status = auth_system_session_info(*db, lp_ctx, &session_info);
1496         if (!NT_STATUS_IS_OK(nt_status)) {
1497                 return nt_status;
1498         }
1499
1500         /* The idea here is very simple.  Using Kerberos to
1501          * authenticate the KDC to the LDAP server is higly likely to
1502          * be circular.
1503          *
1504          * In future we may set this up to use EXERNAL and SSL
1505          * certificates, for now it will almost certainly be NTLMSSP
1506         */
1507
1508         cli_credentials_set_kerberos_state(session_info->credentials,
1509                                            CRED_DONT_USE_KERBEROS);
1510
1511         /* Setup the link to LDB */
1512         (*db)->hdb_db = samdb_connect(*db, ev_ctx, lp_ctx, session_info);
1513         if ((*db)->hdb_db == NULL) {
1514                 DEBUG(1, ("hdb_ldb_create: Cannot open samdb for KDC backend!"));
1515                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1516         }
1517
1518         (*db)->hdb_dbc = NULL;
1519         (*db)->hdb_open = LDB_open;
1520         (*db)->hdb_close = LDB_close;
1521         (*db)->hdb_fetch = LDB_fetch;
1522         (*db)->hdb_store = LDB_store;
1523         (*db)->hdb_remove = LDB_remove;
1524         (*db)->hdb_firstkey = LDB_firstkey;
1525         (*db)->hdb_nextkey = LDB_nextkey;
1526         (*db)->hdb_lock = LDB_lock;
1527         (*db)->hdb_unlock = LDB_unlock;
1528         (*db)->hdb_rename = LDB_rename;
1529         /* we don't implement these, as we are not a lockable database */
1530         (*db)->hdb__get = NULL;
1531         (*db)->hdb__put = NULL;
1532         /* kadmin should not be used for deletes - use other tools instead */
1533         (*db)->hdb__del = NULL;
1534         (*db)->hdb_destroy = LDB_destroy;
1535
1536         return NT_STATUS_OK;
1537 }
1538
1539 krb5_error_code hdb_ldb_create(krb5_context context, struct HDB **db, const char *arg)
1540 {
1541         NTSTATUS nt_status;
1542         /* The global kdc_mem_ctx and kdc_lp_ctx, Disgusting, ugly hack, but it means one less private hook */
1543         nt_status = kdc_hdb_ldb_create(kdc_mem_ctx, event_context_find(kdc_mem_ctx), kdc_lp_ctx,
1544                                        context, db, arg);
1545
1546         if (NT_STATUS_IS_OK(nt_status)) {
1547                 return 0;
1548         }
1549         return EINVAL;
1550 }