source4/kdc/hdb-samba4.c

   1 /*
   2  * Copyright (c) 1999-2001, 2003, PADL Software Pty Ltd.
   3  * Copyright (c) 2004-2009, Andrew Bartlett <abartlet@samba.org>.
   4  * Copyright (c) 2004, Stefan Metzmacher <metze@samba.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * 3. Neither the name of PADL Software  nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "includes.h"
  36 #include "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 "libcli/security/security.h"
  42 #include "auth/auth.h"
  43 #include "auth/credentials/credentials.h"
  44 #include "auth/auth_sam.h"
  45 #include "../lib/util/util_ldb.h"
  46 #include "dsdb/samdb/samdb.h"
  47 #include "librpc/ndr/libndr.h"
  48 #include "librpc/gen_ndr/ndr_drsblobs.h"
  49 #include "librpc/gen_ndr/lsa.h"
  50 #include "libcli/auth/libcli_auth.h"
  51 #include "param/param.h"
  52 #include "events/events.h"
  53 #include "kdc/kdc.h"
  54 #include "../lib/crypto/md4.h"
  55
  56 enum hdb_ldb_ent_type
  57 { HDB_SAMBA4_ENT_TYPE_CLIENT, HDB_SAMBA4_ENT_TYPE_SERVER,
  58   HDB_SAMBA4_ENT_TYPE_KRBTGT, HDB_SAMBA4_ENT_TYPE_TRUST, HDB_SAMBA4_ENT_TYPE_ANY };
  59
  60 enum trust_direction {
  61         UNKNOWN = 0,
  62         INBOUND = LSA_TRUST_DIRECTION_INBOUND,
  63         OUTBOUND = LSA_TRUST_DIRECTION_OUTBOUND
  64 };
  65
  66 static const char *trust_attrs[] = {
  67         "trustPartner",
  68         "trustAuthIncoming",
  69         "trustAuthOutgoing",
  70         "whenCreated",
  71         "msDS-SupportedEncryptionTypes",
  72         "trustAttributes",
  73         "trustDirection",
  74         "trustType",
  75         NULL
  76 };
  77
  78 static KerberosTime ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, KerberosTime default_val)
  79 {
  80     const char *tmp;
  81     const char *gentime;
  82     struct tm tm;
  83
  84     gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
  85     if (!gentime)
  86         return default_val;
  87
  88     tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
  89     if (tmp == NULL) {
  90             return default_val;
  91     }
  92
  93     return timegm(&tm);
  94 }
  95
  96 static HDBFlags uf2HDBFlags(krb5_context context, int userAccountControl, enum hdb_ldb_ent_type ent_type)
  97 {
  98         HDBFlags flags = int2HDBFlags(0);
  99
 100         /* we don't allow kadmin deletes */
 101         flags.immutable = 1;
 102
 103         /* mark the principal as invalid to start with */
 104         flags.invalid = 1;
 105
 106         flags.renewable = 1;
 107
 108         /* All accounts are servers, but this may be disabled again in the caller */
 109         flags.server = 1;
 110
 111         /* Account types - clear the invalid bit if it turns out to be valid */
 112         if (userAccountControl & UF_NORMAL_ACCOUNT) {
 113                 if (ent_type == HDB_SAMBA4_ENT_TYPE_CLIENT || ent_type == HDB_SAMBA4_ENT_TYPE_ANY) {
 114                         flags.client = 1;
 115                 }
 116                 flags.invalid = 0;
 117         }
 118
 119         if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
 120                 if (ent_type == HDB_SAMBA4_ENT_TYPE_CLIENT || ent_type == HDB_SAMBA4_ENT_TYPE_ANY) {
 121                         flags.client = 1;
 122                 }
 123                 flags.invalid = 0;
 124         }
 125         if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
 126                 if (ent_type == HDB_SAMBA4_ENT_TYPE_CLIENT || ent_type == HDB_SAMBA4_ENT_TYPE_ANY) {
 127                         flags.client = 1;
 128                 }
 129                 flags.invalid = 0;
 130         }
 131         if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
 132                 if (ent_type == HDB_SAMBA4_ENT_TYPE_CLIENT || ent_type == HDB_SAMBA4_ENT_TYPE_ANY) {
 133                         flags.client = 1;
 134                 }
 135                 flags.invalid = 0;
 136         }
 137
 138         /* Not permitted to act as a client if disabled */
 139         if (userAccountControl & UF_ACCOUNTDISABLE) {
 140                 flags.client = 0;
 141         }
 142         if (userAccountControl & UF_LOCKOUT) {
 143                 flags.invalid = 1;
 144         }
 145 /*
 146         if (userAccountControl & UF_PASSWORD_NOTREQD) {
 147                 flags.invalid = 1;
 148         }
 149 */
 150 /*
 151         UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
 152 */
 153         if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
 154                 flags.invalid = 1;
 155         }
 156
 157 /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in LDB_message2entry() */
 158
 159 /*
 160         if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
 161                 flags.invalid = 1;
 162         }
 163 */
 164         if (userAccountControl & UF_SMARTCARD_REQUIRED) {
 165                 flags.require_hwauth = 1;
 166         }
 167         if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
 168                 flags.ok_as_delegate = 1;
 169         }
 170         if (!(userAccountControl & UF_NOT_DELEGATED)) {
 171                 flags.forwardable = 1;
 172                 flags.proxiable = 1;
 173         }
 174
 175         if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
 176                 flags.require_preauth = 0;
 177         } else {
 178                 flags.require_preauth = 1;
 179
 180         }
 181         return flags;
 182 }
 183
 184 static int hdb_ldb_destructor(struct hdb_ldb_private *p)
 185 {
 186     hdb_entry_ex *entry_ex = p->entry_ex;
 187     free_hdb_entry(&entry_ex->entry);
 188     return 0;
 189 }
 190
 191 static void hdb_ldb_free_entry(krb5_context context, hdb_entry_ex *entry_ex)
 192 {
 193         talloc_free(entry_ex->ctx);
 194 }
 195
 196 static krb5_error_code LDB_message2entry_keys(krb5_context context,
 197                                               struct smb_iconv_convenience *iconv_convenience,
 198                                               TALLOC_CTX *mem_ctx,
 199                                               struct ldb_message *msg,
 200                                               unsigned int userAccountControl,
 201                                               hdb_entry_ex *entry_ex)
 202 {
 203         krb5_error_code ret = 0;
 204         enum ndr_err_code ndr_err;
 205         struct samr_Password *hash;
 206         const struct ldb_val *sc_val;
 207         struct supplementalCredentialsBlob scb;
 208         struct supplementalCredentialsPackage *scpk = NULL;
 209         bool newer_keys = false;
 210         struct package_PrimaryKerberosBlob _pkb;
 211         struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
 212         struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
 213         uint32_t i;
 214         uint32_t allocated_keys = 0;
 215
 216         entry_ex->entry.keys.val = NULL;
 217         entry_ex->entry.keys.len = 0;
 218
 219         entry_ex->entry.kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
 220
 221         /* Get keys from the db */
 222
 223         hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
 224         sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
 225
 226         /* unicodePwd for enctype 0x17 (23) if present */
 227         if (hash) {
 228                 allocated_keys++;
 229         }
 230
 231         /* supplementalCredentials if present */
 232         if (sc_val) {
 233                 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, iconv_convenience, &scb,
 234                                                    (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
 235                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 236                         dump_data(0, sc_val->data, sc_val->length);
 237                         ret = EINVAL;
 238                         goto out;
 239                 }
 240
 241                 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
 242                         NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
 243                         ret = EINVAL;
 244                         goto out;
 245                 }
 246
 247                 for (i=0; i < scb.sub.num_packages; i++) {
 248                         if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
 249                                 scpk = &scb.sub.packages[i];
 250                                 if (!scpk->data || !scpk->data[0]) {
 251                                         scpk = NULL;
 252                                         continue;
 253                                 }
 254                                 newer_keys = true;
 255                                 break;
 256                         } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
 257                                 scpk = &scb.sub.packages[i];
 258                                 if (!scpk->data || !scpk->data[0]) {
 259                                         scpk = NULL;
 260                                 }
 261                                 /*
 262                                  * we don't break here in hope to find
 263                                  * a Kerberos-Newer-Keys package
 264                                  */
 265                         }
 266                 }
 267         }
 268         /*
 269          * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
 270          * of supplementalCredentials
 271          */
 272         if (scpk) {
 273                 DATA_BLOB blob;
 274
 275                 blob = strhex_to_data_blob(mem_ctx, scpk->data);
 276                 if (!blob.data) {
 277                         ret = ENOMEM;
 278                         goto out;
 279                 }
 280
 281                 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
 282                 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, iconv_convenience, &_pkb,
 283                                                (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
 284                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 285                         ret = EINVAL;
 286                         krb5_set_error_message(context, ret, "LDB_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 287                         krb5_warnx(context, "LDB_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 288                         goto out;
 289                 }
 290
 291                 if (newer_keys && _pkb.version != 4) {
 292                         ret = EINVAL;
 293                         krb5_set_error_message(context, ret, "LDB_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 294                         krb5_warnx(context, "LDB_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 295                         goto out;
 296                 }
 297
 298                 if (!newer_keys && _pkb.version != 3) {
 299                         ret = EINVAL;
 300                         krb5_set_error_message(context, ret, "LDB_message2entry_keys: could not parse Primary:Kerberos not version 3");
 301                         krb5_warnx(context, "LDB_message2entry_keys: could not parse Primary:Kerberos not version 3");
 302                         goto out;
 303                 }
 304
 305                 if (_pkb.version == 4) {
 306                         pkb4 = &_pkb.ctr.ctr4;
 307                         allocated_keys += pkb4->num_keys;
 308                 } else if (_pkb.version == 3) {
 309                         pkb3 = &_pkb.ctr.ctr3;
 310                         allocated_keys += pkb3->num_keys;
 311                 }
 312         }
 313
 314         if (allocated_keys == 0) {
 315                 /* oh, no password.  Apparently (comment in
 316                  * hdb-ldap.c) this violates the ASN.1, but this
 317                  * allows an entry with no keys (yet). */
 318                 return 0;
 319         }
 320
 321         /* allocate space to decode into */
 322         entry_ex->entry.keys.len = 0;
 323         entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(Key));
 324         if (entry_ex->entry.keys.val == NULL) {
 325                 ret = ENOMEM;
 326                 goto out;
 327         }
 328
 329         if (hash && !(userAccountControl & UF_USE_DES_KEY_ONLY)) {
 330                 Key key;
 331
 332                 key.mkvno = 0;
 333                 key.salt = NULL; /* No salt for this enc type */
 334
 335                 ret = krb5_keyblock_init(context,
 336                                          ENCTYPE_ARCFOUR_HMAC_MD5,
 337                                          hash->hash, sizeof(hash->hash),
 338                                          &key.key);
 339                 if (ret) {
 340                         goto out;
 341                 }
 342
 343                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 344                 entry_ex->entry.keys.len++;
 345         }
 346
 347         if (pkb4) {
 348                 for (i=0; i < pkb4->num_keys; i++) {
 349                         bool use = true;
 350                         Key key;
 351
 352                         if (!pkb4->keys[i].value) continue;
 353
 354                         if (userAccountControl & UF_USE_DES_KEY_ONLY) {
 355                                 switch (pkb4->keys[i].keytype) {
 356                                 case ENCTYPE_DES_CBC_CRC:
 357                                 case ENCTYPE_DES_CBC_MD5:
 358                                         break;
 359                                 default:
 360                                         use = false;
 361                                         break;
 362                                 }
 363                         }
 364
 365                         if (!use) continue;
 366
 367                         key.mkvno = 0;
 368                         key.salt = NULL;
 369
 370                         if (pkb4->salt.string) {
 371                                 DATA_BLOB salt;
 372
 373                                 salt = data_blob_string_const(pkb4->salt.string);
 374
 375                                 key.salt = calloc(1, sizeof(*key.salt));
 376                                 if (key.salt == NULL) {
 377                                         ret = ENOMEM;
 378                                         goto out;
 379                                 }
 380
 381                                 key.salt->type = hdb_pw_salt;
 382
 383                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
 384                                 if (ret) {
 385                                         free(key.salt);
 386                                         key.salt = NULL;
 387                                         goto out;
 388                                 }
 389                         }
 390
 391                         /* TODO: maybe pass the iteration_count somehow... */
 392
 393                         ret = krb5_keyblock_init(context,
 394                                                  pkb4->keys[i].keytype,
 395                                                  pkb4->keys[i].value->data,
 396                                                  pkb4->keys[i].value->length,
 397                                                  &key.key);
 398                         if (ret) {
 399                                 if (key.salt) {
 400                                         free_Salt(key.salt);
 401                                         free(key.salt);
 402                                         key.salt = NULL;
 403                                 }
 404                                 goto out;
 405                         }
 406
 407                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 408                         entry_ex->entry.keys.len++;
 409                 }
 410         } else if (pkb3) {
 411                 for (i=0; i < pkb3->num_keys; i++) {
 412                         bool use = true;
 413                         Key key;
 414
 415                         if (!pkb3->keys[i].value) continue;
 416
 417                         if (userAccountControl & UF_USE_DES_KEY_ONLY) {
 418                                 switch (pkb3->keys[i].keytype) {
 419                                 case ENCTYPE_DES_CBC_CRC:
 420                                 case ENCTYPE_DES_CBC_MD5:
 421                                         break;
 422                                 default:
 423                                         use = false;
 424                                         break;
 425                                 }
 426                         }
 427
 428                         if (!use) continue;
 429
 430                         key.mkvno = 0;
 431                         key.salt = NULL;
 432
 433                         if (pkb3->salt.string) {
 434                                 DATA_BLOB salt;
 435
 436                                 salt = data_blob_string_const(pkb3->salt.string);
 437
 438                                 key.salt = calloc(1, sizeof(*key.salt));
 439                                 if (key.salt == NULL) {
 440                                         ret = ENOMEM;
 441                                         goto out;
 442                                 }
 443
 444                                 key.salt->type = hdb_pw_salt;
 445
 446                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
 447                                 if (ret) {
 448                                         free(key.salt);
 449                                         key.salt = NULL;
 450                                         goto out;
 451                                 }
 452                         }
 453
 454                         ret = krb5_keyblock_init(context,
 455                                                  pkb3->keys[i].keytype,
 456                                                  pkb3->keys[i].value->data,
 457                                                  pkb3->keys[i].value->length,
 458                                                  &key.key);
 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         }
 472
 473 out:
 474         if (ret != 0) {
 475                 entry_ex->entry.keys.len = 0;
 476         }
 477         if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
 478                 free(entry_ex->entry.keys.val);
 479                 entry_ex->entry.keys.val = NULL;
 480         }
 481         return ret;
 482 }
 483
 484 /*
 485  * Construct an hdb_entry from a directory entry.
 486  */
 487 static krb5_error_code LDB_message2entry(krb5_context context, HDB *db,
 488                                          TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 489                                          enum hdb_ldb_ent_type ent_type,
 490                                          struct ldb_dn *realm_dn,
 491                                          struct ldb_message *msg,
 492                                          hdb_entry_ex *entry_ex)
 493 {
 494         unsigned int userAccountControl;
 495         int i;
 496         krb5_error_code ret = 0;
 497         krb5_boolean is_computer = FALSE;
 498         struct loadparm_context *lp_ctx = ldb_get_opaque((struct ldb_context *)db->hdb_db, "loadparm");
 499         char *realm = strupper_talloc(mem_ctx, lp_realm(lp_ctx));
 500
 501         struct hdb_ldb_private *p;
 502         NTTIME acct_expiry;
 503         NTSTATUS status;
 504
 505         uint32_t rid;
 506         struct ldb_message_element *objectclasses;
 507         struct ldb_val computer_val;
 508         const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
 509         computer_val.data = discard_const_p(uint8_t,"computer");
 510         computer_val.length = strlen((const char *)computer_val.data);
 511
 512         if (!samAccountName) {
 513                 ret = ENOENT;
 514                 krb5_set_error_message(context, ret, "LDB_message2entry: no samAccountName present");
 515                 goto out;
 516         }
 517
 518         objectclasses = ldb_msg_find_element(msg, "objectClass");
 519
 520         if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
 521                 is_computer = TRUE;
 522         }
 523
 524         memset(entry_ex, 0, sizeof(*entry_ex));
 525
 526         if (!realm) {
 527                 ret = ENOMEM;
 528                 krb5_set_error_message(context, ret, "talloc_strdup: out of memory");
 529                 goto out;
 530         }
 531
 532         p = talloc(mem_ctx, struct hdb_ldb_private);
 533         if (!p) {
 534                 ret = ENOMEM;
 535                 goto out;
 536         }
 537
 538         p->entry_ex = entry_ex;
 539         p->iconv_convenience = lp_iconv_convenience(lp_ctx);
 540         p->lp_ctx = lp_ctx;
 541         p->realm_dn = talloc_reference(p, realm_dn);
 542         if (!p->realm_dn) {
 543                 ret = ENOMEM;
 544                 goto out;
 545         }
 546
 547         talloc_set_destructor(p, hdb_ldb_destructor);
 548
 549         entry_ex->ctx = p;
 550         entry_ex->free_entry = hdb_ldb_free_entry;
 551
 552         userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
 553
 554
 555         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 556         if (ent_type == HDB_SAMBA4_ENT_TYPE_ANY && principal == NULL) {
 557                 krb5_make_principal(context, &entry_ex->entry.principal, realm, samAccountName, NULL);
 558         } else {
 559                 ret = copy_Principal(principal, entry_ex->entry.principal);
 560                 if (ret) {
 561                         krb5_clear_error_message(context);
 562                         goto out;
 563                 }
 564
 565                 /* While we have copied the client principal, tests
 566                  * show that Win2k3 returns the 'corrected' realm, not
 567                  * the client-specified realm.  This code attempts to
 568                  * replace the client principal's realm with the one
 569                  * we determine from our records */
 570
 571                 /* this has to be with malloc() */
 572                 krb5_principal_set_realm(context, entry_ex->entry.principal, realm);
 573         }
 574
 575         /* First try and figure out the flags based on the userAccountControl */
 576         entry_ex->entry.flags = uf2HDBFlags(context, userAccountControl, ent_type);
 577
 578         /* Windows 2008 seems to enforce this (very sensible) rule by
 579          * default - don't allow offline attacks on a user's password
 580          * by asking for a ticket to them as a service (encrypted with
 581          * their probably patheticly insecure password) */
 582
 583         if (entry_ex->entry.flags.server
 584             && lp_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
 585                 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
 586                         entry_ex->entry.flags.server = 0;
 587                 }
 588         }
 589
 590         {
 591                 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
 592                  * of the Heimdal KDC.  They are stored in a the traditional
 593                  * DB for audit purposes, and still form part of the structure
 594                  * we must return */
 595
 596                 /* use 'whenCreated' */
 597                 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 598                 /* use '???' */
 599                 entry_ex->entry.created_by.principal = NULL;
 600
 601                 entry_ex->entry.modified_by = (Event *) malloc(sizeof(Event));
 602                 if (entry_ex->entry.modified_by == NULL) {
 603                         ret = ENOMEM;
 604                         krb5_set_error_message(context, ret, "malloc: out of memory");
 605                         goto out;
 606                 }
 607
 608                 /* use 'whenChanged' */
 609                 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
 610                 /* use '???' */
 611                 entry_ex->entry.modified_by->principal = NULL;
 612         }
 613
 614
 615         /* The lack of password controls etc applies to krbtgt by
 616          * virtue of being that particular RID */
 617         status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
 618
 619         if (!NT_STATUS_IS_OK(status)) {
 620                 ret = EINVAL;
 621                 goto out;
 622         }
 623
 624         if (rid == DOMAIN_RID_KRBTGT) {
 625                 entry_ex->entry.valid_end = NULL;
 626                 entry_ex->entry.pw_end = NULL;
 627
 628                 entry_ex->entry.flags.invalid = 0;
 629                 entry_ex->entry.flags.server = 1;
 630
 631                 /* Don't mark all requests for the krbtgt/realm as
 632                  * 'change password', as otherwise we could get into
 633                  * trouble, and not enforce the password expirty.
 634                  * Instead, only do it when request is for the kpasswd service */
 635                 if (ent_type == HDB_SAMBA4_ENT_TYPE_SERVER
 636                     && principal->name.name_string.len == 2
 637                     && (strcmp(principal->name.name_string.val[0], "kadmin") == 0)
 638                     && (strcmp(principal->name.name_string.val[1], "changepw") == 0)
 639                     && lp_is_my_domain_or_realm(lp_ctx, principal->realm)) {
 640                         entry_ex->entry.flags.change_pw = 1;
 641                 }
 642                 entry_ex->entry.flags.client = 0;
 643                 entry_ex->entry.flags.forwardable = 1;
 644                 entry_ex->entry.flags.ok_as_delegate = 1;
 645         } else if (entry_ex->entry.flags.server && ent_type == HDB_SAMBA4_ENT_TYPE_SERVER) {
 646                 /* The account/password expiry only applies when the account is used as a
 647                  * client (ie password login), not when used as a server */
 648
 649                 /* Make very well sure we don't use this for a client,
 650                  * it could bypass the password restrictions */
 651                 entry_ex->entry.flags.client = 0;
 652
 653                 entry_ex->entry.valid_end = NULL;
 654                 entry_ex->entry.pw_end = NULL;
 655
 656         } else {
 657                 NTTIME must_change_time
 658                         = samdb_result_force_password_change((struct ldb_context *)db->hdb_db, mem_ctx,
 659                                                              realm_dn, msg);
 660                 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
 661                         entry_ex->entry.pw_end = NULL;
 662                 } else {
 663                         entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
 664                         if (entry_ex->entry.pw_end == NULL) {
 665                                 ret = ENOMEM;
 666                                 goto out;
 667                         }
 668                         *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
 669                 }
 670
 671                 acct_expiry = samdb_result_account_expires(msg);
 672                 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
 673                         entry_ex->entry.valid_end = NULL;
 674                 } else {
 675                         entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
 676                         if (entry_ex->entry.valid_end == NULL) {
 677                                 ret = ENOMEM;
 678                                 goto out;
 679                         }
 680                         *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
 681                 }
 682         }
 683
 684         entry_ex->entry.valid_start = NULL;
 685
 686         entry_ex->entry.max_life = NULL;
 687
 688         entry_ex->entry.max_renew = NULL;
 689
 690         entry_ex->entry.generation = NULL;
 691
 692         /* Get keys from the db */
 693         ret = LDB_message2entry_keys(context, p->iconv_convenience, p, msg, userAccountControl, entry_ex);
 694         if (ret) {
 695                 /* Could be bougus data in the entry, or out of memory */
 696                 goto out;
 697         }
 698
 699         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 700         if (entry_ex->entry.etypes == NULL) {
 701                 krb5_clear_error_message(context);
 702                 ret = ENOMEM;
 703                 goto out;
 704         }
 705         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 706         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 707         if (entry_ex->entry.etypes->val == NULL) {
 708                 krb5_clear_error_message(context);
 709                 ret = ENOMEM;
 710                 goto out;
 711         }
 712         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 713                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 714         }
 715
 716
 717         p->msg = talloc_steal(p, msg);
 718         p->samdb = (struct ldb_context *)db->hdb_db;
 719
 720 out:
 721         if (ret != 0) {
 722                 /* This doesn't free ent itself, that is for the eventual caller to do */
 723                 hdb_free_entry(context, entry_ex);
 724         } else {
 725                 talloc_steal(db, entry_ex->ctx);
 726         }
 727
 728         return ret;
 729 }
 730
 731 /*
 732  * Construct an hdb_entry from a directory entry.
 733  */
 734 static krb5_error_code LDB_trust_message2entry(krb5_context context, HDB *db,
 735                                                struct loadparm_context *lp_ctx,
 736                                                TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 737                                                enum trust_direction direction,
 738                                                struct ldb_dn *realm_dn,
 739                                                struct ldb_message *msg,
 740                                                hdb_entry_ex *entry_ex)
 741 {
 742
 743         const char *dnsdomain;
 744         char *realm;
 745         DATA_BLOB password_utf16;
 746         struct samr_Password password_hash;
 747         const struct ldb_val *password_val;
 748         struct trustAuthInOutBlob password_blob;
 749         struct hdb_ldb_private *p;
 750
 751         enum ndr_err_code ndr_err;
 752         int i, ret, trust_direction_flags;
 753
 754         p = talloc(mem_ctx, struct hdb_ldb_private);
 755         if (!p) {
 756                 ret = ENOMEM;
 757                 goto out;
 758         }
 759
 760         p->entry_ex = entry_ex;
 761         p->iconv_convenience = lp_iconv_convenience(lp_ctx);
 762         p->lp_ctx = lp_ctx;
 763         p->realm_dn = realm_dn;
 764
 765         talloc_set_destructor(p, hdb_ldb_destructor);
 766
 767         entry_ex->ctx = p;
 768         entry_ex->free_entry = hdb_ldb_free_entry;
 769
 770         /* use 'whenCreated' */
 771         entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 772         /* use '???' */
 773         entry_ex->entry.created_by.principal = NULL;
 774
 775         entry_ex->entry.valid_start = NULL;
 776
 777         trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
 778
 779         if (direction == INBOUND) {
 780                 realm = strupper_talloc(mem_ctx, lp_realm(lp_ctx));
 781                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
 782
 783         } else { /* OUTBOUND */
 784                 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
 785                 realm = strupper_talloc(mem_ctx, dnsdomain);
 786                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
 787         }
 788
 789         if (!password_val || !(trust_direction_flags & direction)) {
 790                 ret = ENOENT;
 791                 goto out;
 792         }
 793
 794         ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, p->iconv_convenience, &password_blob,
 795                                            (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
 796         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 797                 ret = EINVAL;
 798                 goto out;
 799         }
 800
 801         entry_ex->entry.kvno = -1;
 802         for (i=0; i < password_blob.count; i++) {
 803                 if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_VERSION) {
 804                         entry_ex->entry.kvno = password_blob.current->array[i].AuthInfo.version.version;
 805                 }
 806         }
 807
 808         for (i=0; i < password_blob.count; i++) {
 809                 if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
 810                         password_utf16 = data_blob_const(password_blob.current->array[i].AuthInfo.clear.password,
 811                                                          password_blob.current->array[i].AuthInfo.clear.size);
 812                         /* In the future, generate all sorts of
 813                          * hashes, but for now we can't safely convert
 814                          * the random strings windows uses into
 815                          * utf8 */
 816
 817                         /* but as it is utf16 already, we can get the NT password/arcfour-hmac-md5 key */
 818                         mdfour(password_hash.hash, password_utf16.data, password_utf16.length);
 819                         break;
 820                 } else if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
 821                         password_hash = password_blob.current->array[i].AuthInfo.nt4owf.password;
 822                         break;
 823                 }
 824         }
 825         entry_ex->entry.keys.len = 0;
 826         entry_ex->entry.keys.val = NULL;
 827
 828         if (i < password_blob.count) {
 829                 Key key;
 830                 /* Must have found a cleartext or MD4 password */
 831                 entry_ex->entry.keys.val = calloc(1, sizeof(Key));
 832
 833                 key.mkvno = 0;
 834                 key.salt = NULL; /* No salt for this enc type */
 835
 836                 if (entry_ex->entry.keys.val == NULL) {
 837                         ret = ENOMEM;
 838                         goto out;
 839                 }
 840
 841                 ret = krb5_keyblock_init(context,
 842                                          ENCTYPE_ARCFOUR_HMAC_MD5,
 843                                          password_hash.hash, sizeof(password_hash.hash),
 844                                          &key.key);
 845
 846                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 847                 entry_ex->entry.keys.len++;
 848         }
 849
 850         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 851
 852         ret = copy_Principal(principal, entry_ex->entry.principal);
 853         if (ret) {
 854                 krb5_clear_error_message(context);
 855                 goto out;
 856         }
 857
 858         /* While we have copied the client principal, tests
 859          * show that Win2k3 returns the 'corrected' realm, not
 860          * the client-specified realm.  This code attempts to
 861          * replace the client principal's realm with the one
 862          * we determine from our records */
 863
 864         krb5_principal_set_realm(context, entry_ex->entry.principal, realm);
 865         entry_ex->entry.flags = int2HDBFlags(0);
 866         entry_ex->entry.flags.immutable = 1;
 867         entry_ex->entry.flags.invalid = 0;
 868         entry_ex->entry.flags.server = 1;
 869         entry_ex->entry.flags.require_preauth = 1;
 870
 871         entry_ex->entry.pw_end = NULL;
 872
 873         entry_ex->entry.max_life = NULL;
 874
 875         entry_ex->entry.max_renew = NULL;
 876
 877         entry_ex->entry.generation = NULL;
 878
 879         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 880         if (entry_ex->entry.etypes == NULL) {
 881                 krb5_clear_error_message(context);
 882                 ret = ENOMEM;
 883                 goto out;
 884         }
 885         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 886         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 887         if (entry_ex->entry.etypes->val == NULL) {
 888                 krb5_clear_error_message(context);
 889                 ret = ENOMEM;
 890                 goto out;
 891         }
 892         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 893                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 894         }
 895
 896
 897         p->msg = talloc_steal(p, msg);
 898         p->samdb = (struct ldb_context *)db->hdb_db;
 899
 900 out:
 901         if (ret != 0) {
 902                 /* This doesn't free ent itself, that is for the eventual caller to do */
 903                 hdb_free_entry(context, entry_ex);
 904         } else {
 905                 talloc_steal(db, entry_ex->ctx);
 906         }
 907
 908         return ret;
 909
 910 }
 911
 912 static krb5_error_code LDB_lookup_principal(krb5_context context, struct ldb_context *ldb_ctx,
 913                                             TALLOC_CTX *mem_ctx,
 914                                             krb5_const_principal principal,
 915                                             enum hdb_ldb_ent_type ent_type,
 916                                             struct ldb_dn *realm_dn,
 917                                             struct ldb_message **pmsg)
 918 {
 919         krb5_error_code ret;
 920         int lret;
 921         char *filter = NULL;
 922         const char * const *princ_attrs = user_attrs;
 923         char *short_princ;
 924         char *short_princ_talloc;
 925
 926         ret = krb5_unparse_name_flags(context, principal,  KRB5_PRINCIPAL_UNPARSE_NO_REALM, &short_princ);
 927
 928         if (ret != 0) {
 929                 krb5_set_error_message(context, ret, "LDB_lookup_principal: could not parse principal");
 930                 krb5_warnx(context, "LDB_lookup_principal: could not parse principal");
 931                 return ret;
 932         }
 933
 934         short_princ_talloc = talloc_strdup(mem_ctx, short_princ);
 935         free(short_princ);
 936         if (!short_princ_talloc) {
 937                 ret = ENOMEM;
 938                 krb5_set_error_message(context, ret, "LDB_lookup_principal: talloc_strdup() failed!");
 939                 return ret;
 940         }
 941
 942         switch (ent_type) {
 943         case HDB_SAMBA4_ENT_TYPE_CLIENT:
 944         case HDB_SAMBA4_ENT_TYPE_TRUST:
 945         case HDB_SAMBA4_ENT_TYPE_ANY:
 946                 /* Can't happen */
 947                 return EINVAL;
 948         case HDB_SAMBA4_ENT_TYPE_KRBTGT:
 949                 filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(samAccountName=%s))",
 950                                          KRB5_TGS_NAME);
 951                 break;
 952         case HDB_SAMBA4_ENT_TYPE_SERVER:
 953                 filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(samAccountName=%s))",
 954                                          short_princ_talloc);
 955                 break;
 956         }
 957
 958         if (!filter) {
 959                 ret = ENOMEM;
 960                 krb5_set_error_message(context, ret, "talloc_asprintf: out of memory");
 961                 return ret;
 962         }
 963
 964         lret = gendb_search_single_extended_dn(ldb_ctx, mem_ctx,
 965                                                realm_dn, LDB_SCOPE_SUBTREE,
 966                                                pmsg, princ_attrs, "%s", filter);
 967         if (lret == LDB_ERR_NO_SUCH_OBJECT) {
 968                 DEBUG(3, ("Failed find a entry for %s\n", filter));
 969                 return HDB_ERR_NOENTRY;
 970         }
 971         if (lret != LDB_SUCCESS) {
 972                 DEBUG(3, ("Failed single search for for %s - %s\n",
 973                           filter, ldb_errstring(ldb_ctx)));
 974                 return HDB_ERR_NOENTRY;
 975         }
 976         return 0;
 977 }
 978
 979 static krb5_error_code LDB_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
 980                                         TALLOC_CTX *mem_ctx,
 981                                         const char *realm,
 982                                         struct ldb_dn *realm_dn,
 983                                         struct ldb_message **pmsg)
 984 {
 985         int lret;
 986         krb5_error_code ret;
 987         char *filter = NULL;
 988         const char * const *attrs = trust_attrs;
 989
 990         struct ldb_result *res = NULL;
 991         filter = talloc_asprintf(mem_ctx, "(&(objectClass=trustedDomain)(|(flatname=%s)(trustPartner=%s)))", realm, realm);
 992
 993         if (!filter) {
 994                 ret = ENOMEM;
 995                 krb5_set_error_message(context, ret, "talloc_asprintf: out of memory");
 996                 return ret;
 997         }
 998
 999         lret = ldb_search(ldb_ctx, mem_ctx, &res,
1000                           ldb_get_default_basedn(ldb_ctx),
1001                           LDB_SCOPE_SUBTREE, attrs, "%s", filter);
1002         if (lret != LDB_SUCCESS) {
1003                 DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx)));
1004                 return HDB_ERR_NOENTRY;
1005         } else if (res->count == 0 || res->count > 1) {
1006                 DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count));
1007                 talloc_free(res);
1008                 return HDB_ERR_NOENTRY;
1009         }
1010         talloc_steal(mem_ctx, res->msgs);
1011         *pmsg = res->msgs[0];
1012         talloc_free(res);
1013         return 0;
1014 }
1015
1016 static krb5_error_code LDB_open(krb5_context context, HDB *db, int flags, mode_t mode)
1017 {
1018         if (db->hdb_master_key_set) {
1019                 krb5_error_code ret = HDB_ERR_NOENTRY;
1020                 krb5_warnx(context, "LDB_open: use of a master key incompatible with LDB\n");
1021                 krb5_set_error_message(context, ret, "LDB_open: use of a master key incompatible with LDB\n");
1022                 return ret;
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         struct ldb_dn *realm_dn;
1056         krb5_error_code ret;
1057         struct ldb_message *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                                               &realm_dn, &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_SAMBA4_ENT_TYPE_CLIENT,
1079                                 realm_dn, msg, 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_dn *realm_dn = ldb_get_default_basedn(db->hdb_db);
1092         const char *realm;
1093         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(db->hdb_db, "loadparm"), struct loadparm_context);
1094
1095         krb5_principal alloc_principal = NULL;
1096         if (principal->name.name_string.len != 2
1097             || (strcmp(principal->name.name_string.val[0], KRB5_TGS_NAME) != 0)) {
1098                 /* Not a krbtgt */
1099                 return HDB_ERR_NOENTRY;
1100         }
1101
1102         /* krbtgt case.  Either us or a trusted realm */
1103
1104         if (lp_is_my_domain_or_realm(lp_ctx, principal->realm)
1105             && lp_is_my_domain_or_realm(lp_ctx, principal->name.name_string.val[1])) {
1106                 /* us */
1107                 /* Cludge, cludge cludge.  If the realm part of krbtgt/realm,
1108                  * is in our db, then direct the caller at our primary
1109                  * krbtgt */
1110
1111                 char *realm_fixed = strupper_talloc(mem_ctx, lp_realm(lp_ctx));
1112                 if (!realm_fixed) {
1113                         ret = ENOMEM;
1114                         krb5_set_error_message(context, ret, "strupper_talloc: out of memory");
1115                         return ret;
1116                 }
1117
1118                 ret = krb5_copy_principal(context, principal, &alloc_principal);
1119                 if (ret) {
1120                         return ret;
1121                 }
1122
1123                 free(alloc_principal->name.name_string.val[1]);
1124                 alloc_principal->name.name_string.val[1] = strdup(realm_fixed);
1125                 talloc_free(realm_fixed);
1126                 if (!alloc_principal->name.name_string.val[1]) {
1127                         ret = ENOMEM;
1128                         krb5_set_error_message(context, ret, "LDB_fetch: strdup() failed!");
1129                         return ret;
1130                 }
1131                 principal = alloc_principal;
1132
1133                 ret = LDB_lookup_principal(context, (struct ldb_context *)db->hdb_db,
1134                                            mem_ctx,
1135                                            principal, HDB_SAMBA4_ENT_TYPE_KRBTGT, realm_dn, &msg);
1136
1137                 if (ret != 0) {
1138                         krb5_warnx(context, "LDB_fetch: could not find principal in DB");
1139                         krb5_set_error_message(context, ret, "LDB_fetch: could not find principal in DB");
1140                         return ret;
1141                 }
1142
1143                 ret = LDB_message2entry(context, db, mem_ctx,
1144                                         principal, HDB_SAMBA4_ENT_TYPE_KRBTGT,
1145                                         realm_dn, msg, entry_ex);
1146                 if (ret != 0) {
1147                         krb5_warnx(context, "LDB_fetch: self krbtgt message2entry failed");
1148                 }
1149                 return ret;
1150
1151         } else {
1152                 enum trust_direction direction = UNKNOWN;
1153
1154                 /* Either an inbound or outbound trust */
1155
1156                 if (strcasecmp(lp_realm(lp_ctx), principal->realm) == 0) {
1157                         /* look for inbound trust */
1158                         direction = INBOUND;
1159                         realm = principal->name.name_string.val[1];
1160                 }
1161
1162                 if (strcasecmp(lp_realm(lp_ctx), principal->name.name_string.val[1]) == 0) {
1163                         /* look for outbound trust */
1164                         direction = OUTBOUND;
1165                         realm = principal->realm;
1166                 }
1167
1168                 /* Trusted domains are under CN=system */
1169
1170                 ret = LDB_lookup_trust(context, (struct ldb_context *)db->hdb_db,
1171                                        mem_ctx,
1172                                        realm, realm_dn, &msg);
1173
1174                 if (ret != 0) {
1175                         krb5_warnx(context, "LDB_fetch: could not find principal in DB");
1176                         krb5_set_error_message(context, ret, "LDB_fetch: could not find principal in DB");
1177                         return ret;
1178                 }
1179
1180                 ret = LDB_trust_message2entry(context, db, lp_ctx, mem_ctx,
1181                                               principal, direction,
1182                                               realm_dn, msg, entry_ex);
1183                 if (ret != 0) {
1184                         krb5_warnx(context, "LDB_fetch: trust_message2entry failed");
1185                 }
1186                 return ret;
1187
1188
1189                 /* we should lookup trusted domains */
1190                 return HDB_ERR_NOENTRY;
1191         }
1192
1193 }
1194
1195 static krb5_error_code LDB_fetch_server(krb5_context context, HDB *db,
1196                                         TALLOC_CTX *mem_ctx,
1197                                         krb5_const_principal principal,
1198                                         unsigned flags,
1199                                         hdb_entry_ex *entry_ex)
1200 {
1201         krb5_error_code ret;
1202         const char *realm;
1203         struct ldb_message *msg = NULL;
1204         struct ldb_dn *realm_dn;
1205         if (principal->name.name_string.len >= 2) {
1206                 /* 'normal server' case */
1207                 int ldb_ret;
1208                 NTSTATUS nt_status;
1209                 struct ldb_dn *user_dn;
1210                 char *principal_string;
1211
1212                 ret = krb5_unparse_name_flags(context, principal,
1213                                               KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1214                                               &principal_string);
1215                 if (ret != 0) {
1216                         return ret;
1217                 }
1218
1219                 /* At this point we may find the host is known to be
1220                  * in a different realm, so we should generate a
1221                  * referral instead */
1222                 nt_status = crack_service_principal_name((struct ldb_context *)db->hdb_db,
1223                                                          mem_ctx, principal_string,
1224                                                          &user_dn, &realm_dn);
1225                 free(principal_string);
1226
1227                 if (!NT_STATUS_IS_OK(nt_status)) {
1228                         return HDB_ERR_NOENTRY;
1229                 }
1230
1231                 ldb_ret = gendb_search_single_extended_dn((struct ldb_context *)db->hdb_db,
1232                                                           mem_ctx,
1233                                                           user_dn, LDB_SCOPE_BASE,
1234                                                           &msg, user_attrs,
1235                                                           "(objectClass=*)");
1236                 if (ldb_ret != LDB_SUCCESS) {
1237                         return HDB_ERR_NOENTRY;
1238                 }
1239
1240         } else {
1241                 /* server as client principal case, but we must not lookup userPrincipalNames */
1242                 realm_dn = ldb_get_default_basedn((struct ldb_context *)db->hdb_db);
1243                 realm = krb5_principal_get_realm(context, principal);
1244
1245                 /* Check if it is our realm, otherwise give referall */
1246
1247                 ret = LDB_lookup_principal(context, (struct ldb_context *)db->hdb_db,
1248                                            mem_ctx,
1249                                            principal, HDB_SAMBA4_ENT_TYPE_SERVER, realm_dn, &msg);
1250
1251                 if (ret != 0) {
1252                         return ret;
1253                 }
1254         }
1255
1256         ret = LDB_message2entry(context, db, mem_ctx,
1257                                 principal, HDB_SAMBA4_ENT_TYPE_SERVER,
1258                                 realm_dn, msg, entry_ex);
1259         if (ret != 0) {
1260                 krb5_warnx(context, "LDB_fetch: message2entry failed");
1261         }
1262
1263         return ret;
1264 }
1265
1266 static krb5_error_code LDB_fetch(krb5_context context, HDB *db,
1267                                  krb5_const_principal principal,
1268                                  unsigned flags,
1269                                  hdb_entry_ex *entry_ex)
1270 {
1271         krb5_error_code ret = HDB_ERR_NOENTRY;
1272
1273         TALLOC_CTX *mem_ctx = talloc_named(db, 0, "LDB_fetch context");
1274
1275         if (!mem_ctx) {
1276                 ret = ENOMEM;
1277                 krb5_set_error_message(context, ret, "LDB_fetch: talloc_named() failed!");
1278                 return ret;
1279         }
1280
1281         if (flags & HDB_F_GET_CLIENT) {
1282                 ret = LDB_fetch_client(context, db, mem_ctx, principal, flags, entry_ex);
1283                 if (ret != HDB_ERR_NOENTRY) goto done;
1284         }
1285         if (flags & HDB_F_GET_SERVER) {
1286                 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
1287                 ret = LDB_fetch_krbtgt(context, db, mem_ctx, principal, flags, entry_ex);
1288                 if (ret != HDB_ERR_NOENTRY) goto done;
1289
1290                 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
1291                 ret = LDB_fetch_server(context, db, mem_ctx, principal, flags, entry_ex);
1292                 if (ret != HDB_ERR_NOENTRY) goto done;
1293         }
1294         if (flags & HDB_F_GET_KRBTGT) {
1295                 ret = LDB_fetch_krbtgt(context, db, mem_ctx, principal, flags, entry_ex);
1296                 if (ret != HDB_ERR_NOENTRY) goto done;
1297         }
1298
1299 done:
1300         talloc_free(mem_ctx);
1301         return ret;
1302 }
1303
1304 static krb5_error_code LDB_store(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
1305 {
1306         return HDB_ERR_DB_INUSE;
1307 }
1308
1309 static krb5_error_code LDB_remove(krb5_context context, HDB *db, krb5_const_principal principal)
1310 {
1311         return HDB_ERR_DB_INUSE;
1312 }
1313
1314 struct hdb_ldb_seq {
1315         struct ldb_context *ctx;
1316         int index;
1317         int count;
1318         struct ldb_message **msgs;
1319         struct ldb_dn *realm_dn;
1320 };
1321
1322 static krb5_error_code LDB_seq(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
1323 {
1324         krb5_error_code ret;
1325         struct hdb_ldb_seq *priv = (struct hdb_ldb_seq *)db->hdb_dbc;
1326         TALLOC_CTX *mem_ctx;
1327         hdb_entry_ex entry_ex;
1328         memset(&entry_ex, '\0', sizeof(entry_ex));
1329
1330         if (!priv) {
1331                 return HDB_ERR_NOENTRY;
1332         }
1333
1334         mem_ctx = talloc_named(priv, 0, "LDB_seq context");
1335
1336         if (!mem_ctx) {
1337                 ret = ENOMEM;
1338                 krb5_set_error_message(context, ret, "LDB_seq: talloc_named() failed!");
1339                 return ret;
1340         }
1341
1342         if (priv->index < priv->count) {
1343                 ret = LDB_message2entry(context, db, mem_ctx,
1344                                         NULL, HDB_SAMBA4_ENT_TYPE_ANY,
1345                                         priv->realm_dn, priv->msgs[priv->index++], entry);
1346         } else {
1347                 ret = HDB_ERR_NOENTRY;
1348         }
1349
1350         if (ret != 0) {
1351                 talloc_free(priv);
1352                 db->hdb_dbc = NULL;
1353         } else {
1354                 talloc_free(mem_ctx);
1355         }
1356
1357         return ret;
1358 }
1359
1360 static krb5_error_code LDB_firstkey(krb5_context context, HDB *db, unsigned flags,
1361                                         hdb_entry_ex *entry)
1362 {
1363         struct ldb_context *ldb_ctx = (struct ldb_context *)db->hdb_db;
1364         struct hdb_ldb_seq *priv = (struct hdb_ldb_seq *)db->hdb_dbc;
1365         char *realm;
1366         struct ldb_result *res = NULL;
1367         krb5_error_code ret;
1368         TALLOC_CTX *mem_ctx;
1369         int lret;
1370
1371         if (priv) {
1372                 talloc_free(priv);
1373                 db->hdb_dbc = NULL;
1374         }
1375
1376         priv = (struct hdb_ldb_seq *) talloc(db, struct hdb_ldb_seq);
1377         if (!priv) {
1378                 ret = ENOMEM;
1379                 krb5_set_error_message(context, ret, "talloc: out of memory");
1380                 return ret;
1381         }
1382
1383         priv->ctx = ldb_ctx;
1384         priv->index = 0;
1385         priv->msgs = NULL;
1386         priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
1387         priv->count = 0;
1388
1389         mem_ctx = talloc_named(priv, 0, "LDB_firstkey context");
1390
1391         if (!mem_ctx) {
1392                 ret = ENOMEM;
1393                 krb5_set_error_message(context, ret, "LDB_firstkey: talloc_named() failed!");
1394                 return ret;
1395         }
1396
1397         ret = krb5_get_default_realm(context, &realm);
1398         if (ret != 0) {
1399                 talloc_free(priv);
1400                 return ret;
1401         }
1402
1403         lret = ldb_search(ldb_ctx, priv, &res,
1404                           priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
1405                           "(objectClass=user)");
1406
1407         if (lret != LDB_SUCCESS) {
1408                 talloc_free(priv);
1409                 return HDB_ERR_NOENTRY;
1410         }
1411
1412         priv->count = res->count;
1413         priv->msgs = talloc_steal(priv, res->msgs);
1414         talloc_free(res);
1415
1416         db->hdb_dbc = priv;
1417
1418         ret = LDB_seq(context, db, flags, entry);
1419
1420         if (ret != 0) {
1421                 talloc_free(priv);
1422                 db->hdb_dbc = NULL;
1423         } else {
1424                 talloc_free(mem_ctx);
1425         }
1426         return ret;
1427 }
1428
1429 static krb5_error_code LDB_nextkey(krb5_context context, HDB *db, unsigned flags,
1430                                    hdb_entry_ex *entry)
1431 {
1432         return LDB_seq(context, db, flags, entry);
1433 }
1434
1435 static krb5_error_code LDB_destroy(krb5_context context, HDB *db)
1436 {
1437         talloc_free(db);
1438         return 0;
1439 }
1440
1441 /* This interface is to be called by the KDC, which is expecting Samba
1442  * calling conventions.  It is also called by a wrapper
1443  * (hdb_ldb_create) from the kpasswdd -> krb5 -> keytab_hdb -> hdb
1444  * code */
1445
1446 NTSTATUS kdc_hdb_samba4_create(TALLOC_CTX *mem_ctx,
1447                             struct tevent_context *ev_ctx,
1448                             struct loadparm_context *lp_ctx,
1449                             krb5_context context, struct HDB **db, const char *arg)
1450 {
1451         NTSTATUS nt_status;
1452         struct auth_session_info *session_info;
1453         *db = talloc(mem_ctx, HDB);
1454         if (!*db) {
1455                 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
1456                 return NT_STATUS_NO_MEMORY;
1457         }
1458
1459         (*db)->hdb_master_key_set = 0;
1460         (*db)->hdb_db = NULL;
1461
1462         nt_status = auth_system_session_info(*db, lp_ctx, &session_info);
1463         if (!NT_STATUS_IS_OK(nt_status)) {
1464                 return nt_status;
1465         }
1466
1467         /* The idea here is very simple.  Using Kerberos to
1468          * authenticate the KDC to the LDAP server is higly likely to
1469          * be circular.
1470          *
1471          * In future we may set this up to use EXERNAL and SSL
1472          * certificates, for now it will almost certainly be NTLMSSP
1473         */
1474
1475         cli_credentials_set_kerberos_state(session_info->credentials,
1476                                            CRED_DONT_USE_KERBEROS);
1477
1478         /* Setup the link to LDB */
1479         (*db)->hdb_db = samdb_connect(*db, ev_ctx, lp_ctx, session_info);
1480         if ((*db)->hdb_db == NULL) {
1481                 DEBUG(1, ("hdb_ldb_create: Cannot open samdb for KDC backend!"));
1482                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1483         }
1484
1485         (*db)->hdb_dbc = NULL;
1486         (*db)->hdb_open = LDB_open;
1487         (*db)->hdb_close = LDB_close;
1488         (*db)->hdb_fetch = LDB_fetch;
1489         (*db)->hdb_store = LDB_store;
1490         (*db)->hdb_remove = LDB_remove;
1491         (*db)->hdb_firstkey = LDB_firstkey;
1492         (*db)->hdb_nextkey = LDB_nextkey;
1493         (*db)->hdb_lock = LDB_lock;
1494         (*db)->hdb_unlock = LDB_unlock;
1495         (*db)->hdb_rename = LDB_rename;
1496         /* we don't implement these, as we are not a lockable database */
1497         (*db)->hdb__get = NULL;
1498         (*db)->hdb__put = NULL;
1499         /* kadmin should not be used for deletes - use other tools instead */
1500         (*db)->hdb__del = NULL;
1501         (*db)->hdb_destroy = LDB_destroy;
1502
1503         return NT_STATUS_OK;
1504 }
1505
1506 krb5_error_code hdb_samba4_create(krb5_context context, struct HDB **db, const char *arg)
1507 {
1508         NTSTATUS nt_status;
1509         /* The global kdc_mem_ctx and kdc_lp_ctx, Disgusting, ugly hack, but it means one less private hook */
1510         nt_status = kdc_hdb_samba4_create(kdc_mem_ctx, kdc_ev_ctx, kdc_lp_ctx,
1511                                           context, db, arg);
1512
1513         if (NT_STATUS_IS_OK(nt_status)) {
1514                 return 0;
1515         }
1516         return EINVAL;
1517 }