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                         krb5_set_error_string(context, "LDB_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 286                         krb5_warnx(context, "LDB_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 287                         ret = EINVAL;
 288                         goto out;
 289                 }
 290
 291                 if (newer_keys && _pkb.version != 4) {
 292                         krb5_set_error_string(context, "LDB_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 293                         krb5_warnx(context, "LDB_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 294                         ret = EINVAL;
 295                         goto out;
 296                 }
 297
 298                 if (!newer_keys && _pkb.version != 3) {
 299                         krb5_set_error_string(context, "LDB_message2entry_keys: could not parse Primary:Kerberos not version 3");
 300                         krb5_warnx(context, "LDB_message2entry_keys: could not parse Primary:Kerberos not version 3");
 301                         ret = EINVAL;
 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                 krb5_set_error_string(context, "LDB_message2entry: no samAccountName present");
 514                 ret = ENOENT;
 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                 krb5_set_error_string(context, "talloc_strdup: out of memory");
 528                 ret = ENOMEM;
 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                 char *strdup_realm;
 560                 ret = copy_Principal(principal, entry_ex->entry.principal);
 561                 if (ret) {
 562                         krb5_clear_error_string(context);
 563                         goto out;
 564                 }
 565
 566                 /* While we have copied the client principal, tests
 567                  * show that Win2k3 returns the 'corrected' realm, not
 568                  * the client-specified realm.  This code attempts to
 569                  * replace the client principal's realm with the one
 570                  * we determine from our records */
 571
 572                 /* this has to be with malloc() */
 573                 strdup_realm = strdup(realm);
 574                 if (!strdup_realm) {
 575                         ret = ENOMEM;
 576                         krb5_clear_error_string(context);
 577                         goto out;
 578                 }
 579                 free(*krb5_princ_realm(context, entry_ex->entry.principal));
 580                 krb5_princ_set_realm(context, entry_ex->entry.principal, &strdup_realm);
 581         }
 582
 583         /* First try and figure out the flags based on the userAccountControl */
 584         entry_ex->entry.flags = uf2HDBFlags(context, userAccountControl, ent_type);
 585
 586         /* Windows 2008 seems to enforce this (very sensible) rule by
 587          * default - don't allow offline attacks on a user's password
 588          * by asking for a ticket to them as a service (encrypted with
 589          * their probably patheticly insecure password) */
 590
 591         if (entry_ex->entry.flags.server
 592             && lp_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
 593                 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
 594                         entry_ex->entry.flags.server = 0;
 595                 }
 596         }
 597
 598         {
 599                 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
 600                  * of the Heimdal KDC.  They are stored in a the traditional
 601                  * DB for audit purposes, and still form part of the structure
 602                  * we must return */
 603
 604                 /* use 'whenCreated' */
 605                 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 606                 /* use '???' */
 607                 entry_ex->entry.created_by.principal = NULL;
 608
 609                 entry_ex->entry.modified_by = (Event *) malloc(sizeof(Event));
 610                 if (entry_ex->entry.modified_by == NULL) {
 611                         krb5_set_error_string(context, "malloc: out of memory");
 612                         ret = ENOMEM;
 613                         goto out;
 614                 }
 615
 616                 /* use 'whenChanged' */
 617                 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
 618                 /* use '???' */
 619                 entry_ex->entry.modified_by->principal = NULL;
 620         }
 621
 622
 623         /* The lack of password controls etc applies to krbtgt by
 624          * virtue of being that particular RID */
 625         status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
 626
 627         if (!NT_STATUS_IS_OK(status)) {
 628                 ret = EINVAL;
 629                 goto out;
 630         }
 631
 632         if (rid == DOMAIN_RID_KRBTGT) {
 633                 entry_ex->entry.valid_end = NULL;
 634                 entry_ex->entry.pw_end = NULL;
 635
 636                 entry_ex->entry.flags.invalid = 0;
 637                 entry_ex->entry.flags.server = 1;
 638                 entry_ex->entry.flags.change_pw = 1;
 639                 entry_ex->entry.flags.client = 0;
 640                 entry_ex->entry.flags.forwardable = 1;
 641                 entry_ex->entry.flags.ok_as_delegate = 1;
 642         } else if (entry_ex->entry.flags.server && ent_type == HDB_SAMBA4_ENT_TYPE_SERVER) {
 643                 /* The account/password expiry only applies when the account is used as a
 644                  * client (ie password login), not when used as a server */
 645
 646                 /* Make very well sure we don't use this for a client,
 647                  * it could bypass the password restrictions */
 648                 entry_ex->entry.flags.client = 0;
 649
 650                 entry_ex->entry.valid_end = NULL;
 651                 entry_ex->entry.pw_end = NULL;
 652
 653         } else {
 654                 NTTIME must_change_time
 655                         = samdb_result_force_password_change((struct ldb_context *)db->hdb_db, mem_ctx,
 656                                                              realm_dn, msg);
 657                 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
 658                         entry_ex->entry.pw_end = NULL;
 659                 } else {
 660                         entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
 661                         if (entry_ex->entry.pw_end == NULL) {
 662                                 ret = ENOMEM;
 663                                 goto out;
 664                         }
 665                         *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
 666                 }
 667
 668                 acct_expiry = samdb_result_account_expires(msg);
 669                 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
 670                         entry_ex->entry.valid_end = NULL;
 671                 } else {
 672                         entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
 673                         if (entry_ex->entry.valid_end == NULL) {
 674                                 ret = ENOMEM;
 675                                 goto out;
 676                         }
 677                         *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
 678                 }
 679         }
 680
 681         entry_ex->entry.valid_start = NULL;
 682
 683         entry_ex->entry.max_life = NULL;
 684
 685         entry_ex->entry.max_renew = NULL;
 686
 687         entry_ex->entry.generation = NULL;
 688
 689         /* Get keys from the db */
 690         ret = LDB_message2entry_keys(context, p->iconv_convenience, p, msg, userAccountControl, entry_ex);
 691         if (ret) {
 692                 /* Could be bougus data in the entry, or out of memory */
 693                 goto out;
 694         }
 695
 696         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 697         if (entry_ex->entry.etypes == NULL) {
 698                 krb5_clear_error_string(context);
 699                 ret = ENOMEM;
 700                 goto out;
 701         }
 702         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 703         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 704         if (entry_ex->entry.etypes->val == NULL) {
 705                 krb5_clear_error_string(context);
 706                 ret = ENOMEM;
 707                 goto out;
 708         }
 709         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 710                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 711         }
 712
 713
 714         p->msg = talloc_steal(p, msg);
 715         p->samdb = (struct ldb_context *)db->hdb_db;
 716
 717 out:
 718         if (ret != 0) {
 719                 /* This doesn't free ent itself, that is for the eventual caller to do */
 720                 hdb_free_entry(context, entry_ex);
 721         } else {
 722                 talloc_steal(db, entry_ex->ctx);
 723         }
 724
 725         return ret;
 726 }
 727
 728 /*
 729  * Construct an hdb_entry from a directory entry.
 730  */
 731 static krb5_error_code LDB_trust_message2entry(krb5_context context, HDB *db,
 732                                                struct loadparm_context *lp_ctx,
 733                                                TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 734                                                enum trust_direction direction,
 735                                                struct ldb_dn *realm_dn,
 736                                                struct ldb_message *msg,
 737                                                hdb_entry_ex *entry_ex)
 738 {
 739
 740         const char *dnsdomain;
 741         char *realm;
 742         char *strdup_realm;
 743         DATA_BLOB password_utf16;
 744         struct samr_Password password_hash;
 745         const struct ldb_val *password_val;
 746         struct trustAuthInOutBlob password_blob;
 747         struct hdb_ldb_private *p;
 748
 749         enum ndr_err_code ndr_err;
 750         int i, ret, trust_direction_flags;
 751
 752         p = talloc(mem_ctx, struct hdb_ldb_private);
 753         if (!p) {
 754                 ret = ENOMEM;
 755                 goto out;
 756         }
 757
 758         p->entry_ex = entry_ex;
 759         p->iconv_convenience = lp_iconv_convenience(lp_ctx);
 760         p->lp_ctx = lp_ctx;
 761         p->realm_dn = realm_dn;
 762
 763         talloc_set_destructor(p, hdb_ldb_destructor);
 764
 765         entry_ex->ctx = p;
 766         entry_ex->free_entry = hdb_ldb_free_entry;
 767
 768         /* use 'whenCreated' */
 769         entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 770         /* use '???' */
 771         entry_ex->entry.created_by.principal = NULL;
 772
 773         entry_ex->entry.valid_start = NULL;
 774
 775         trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
 776
 777         if (direction == INBOUND) {
 778                 realm = strupper_talloc(mem_ctx, lp_realm(lp_ctx));
 779                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
 780
 781         } else { /* OUTBOUND */
 782                 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
 783                 realm = strupper_talloc(mem_ctx, dnsdomain);
 784                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
 785         }
 786
 787         if (!password_val || !(trust_direction_flags & direction)) {
 788                 ret = ENOENT;
 789                 goto out;
 790         }
 791
 792         ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, p->iconv_convenience, &password_blob,
 793                                            (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
 794         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 795                 ret = EINVAL;
 796                 goto out;
 797         }
 798
 799         entry_ex->entry.kvno = -1;
 800         for (i=0; i < password_blob.count; i++) {
 801                 if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_VERSION) {
 802                         entry_ex->entry.kvno = password_blob.current->array[i].AuthInfo.version.version;
 803                 }
 804         }
 805
 806         for (i=0; i < password_blob.count; i++) {
 807                 if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
 808                         password_utf16 = data_blob_const(password_blob.current->array[i].AuthInfo.clear.password,
 809                                                          password_blob.current->array[i].AuthInfo.clear.size);
 810                         /* In the future, generate all sorts of
 811                          * hashes, but for now we can't safely convert
 812                          * the random strings windows uses into
 813                          * utf8 */
 814
 815                         /* but as it is utf16 already, we can get the NT password/arcfour-hmac-md5 key */
 816                         mdfour(password_hash.hash, password_utf16.data, password_utf16.length);
 817                         break;
 818                 } else if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
 819                         password_hash = password_blob.current->array[i].AuthInfo.nt4owf.password;
 820                         break;
 821                 }
 822         }
 823         entry_ex->entry.keys.len = 0;
 824         entry_ex->entry.keys.val = NULL;
 825
 826         if (i < password_blob.count) {
 827                 Key key;
 828                 /* Must have found a cleartext or MD4 password */
 829                 entry_ex->entry.keys.val = calloc(1, sizeof(Key));
 830
 831                 key.mkvno = 0;
 832                 key.salt = NULL; /* No salt for this enc type */
 833
 834                 if (entry_ex->entry.keys.val == NULL) {
 835                         ret = ENOMEM;
 836                         goto out;
 837                 }
 838
 839                 ret = krb5_keyblock_init(context,
 840                                          ENCTYPE_ARCFOUR_HMAC_MD5,
 841                                          password_hash.hash, sizeof(password_hash.hash),
 842                                          &key.key);
 843
 844                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 845                 entry_ex->entry.keys.len++;
 846         }
 847
 848         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 849
 850         ret = copy_Principal(principal, entry_ex->entry.principal);
 851         if (ret) {
 852                 krb5_clear_error_string(context);
 853                 goto out;
 854         }
 855
 856         /* While we have copied the client principal, tests
 857          * show that Win2k3 returns the 'corrected' realm, not
 858          * the client-specified realm.  This code attempts to
 859          * replace the client principal's realm with the one
 860          * we determine from our records */
 861
 862         /* this has to be with malloc() */
 863         strdup_realm = strdup(realm);
 864         if (!strdup_realm) {
 865                 ret = ENOMEM;
 866                 krb5_clear_error_string(context);
 867                 goto out;
 868         }
 869         free(*krb5_princ_realm(context, entry_ex->entry.principal));
 870         krb5_princ_set_realm(context, entry_ex->entry.principal, &strdup_realm);
 871
 872         entry_ex->entry.flags = int2HDBFlags(0);
 873         entry_ex->entry.flags.immutable = 1;
 874         entry_ex->entry.flags.invalid = 0;
 875         entry_ex->entry.flags.server = 1;
 876         entry_ex->entry.flags.require_preauth = 1;
 877
 878         entry_ex->entry.pw_end = NULL;
 879
 880         entry_ex->entry.max_life = NULL;
 881
 882         entry_ex->entry.max_renew = NULL;
 883
 884         entry_ex->entry.generation = NULL;
 885
 886         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 887         if (entry_ex->entry.etypes == NULL) {
 888                 krb5_clear_error_string(context);
 889                 ret = ENOMEM;
 890                 goto out;
 891         }
 892         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 893         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 894         if (entry_ex->entry.etypes->val == NULL) {
 895                 krb5_clear_error_string(context);
 896                 ret = ENOMEM;
 897                 goto out;
 898         }
 899         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 900                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 901         }
 902
 903
 904         p->msg = talloc_steal(p, msg);
 905         p->samdb = (struct ldb_context *)db->hdb_db;
 906
 907 out:
 908         if (ret != 0) {
 909                 /* This doesn't free ent itself, that is for the eventual caller to do */
 910                 hdb_free_entry(context, entry_ex);
 911         } else {
 912                 talloc_steal(db, entry_ex->ctx);
 913         }
 914
 915         return ret;
 916
 917 }
 918
 919 static krb5_error_code LDB_lookup_principal(krb5_context context, struct ldb_context *ldb_ctx,
 920                                             TALLOC_CTX *mem_ctx,
 921                                             krb5_const_principal principal,
 922                                             enum hdb_ldb_ent_type ent_type,
 923                                             struct ldb_dn *realm_dn,
 924                                             struct ldb_message ***pmsg)
 925 {
 926         krb5_error_code ret;
 927         int lret;
 928         char *filter = NULL;
 929         const char * const *princ_attrs = user_attrs;
 930
 931         char *short_princ;
 932         char *short_princ_talloc;
 933
 934         struct ldb_result *res = NULL;
 935
 936         ret = krb5_unparse_name_flags(context, principal,  KRB5_PRINCIPAL_UNPARSE_NO_REALM, &short_princ);
 937
 938         if (ret != 0) {
 939                 krb5_set_error_string(context, "LDB_lookup_principal: could not parse principal");
 940                 krb5_warnx(context, "LDB_lookup_principal: could not parse principal");
 941                 return ret;
 942         }
 943
 944         short_princ_talloc = talloc_strdup(mem_ctx, short_princ);
 945         free(short_princ);
 946         if (!short_princ_talloc) {
 947                 krb5_set_error_string(context, "LDB_lookup_principal: talloc_strdup() failed!");
 948                 return ENOMEM;
 949         }
 950
 951         switch (ent_type) {
 952         case HDB_SAMBA4_ENT_TYPE_CLIENT:
 953         case HDB_SAMBA4_ENT_TYPE_TRUST:
 954         case HDB_SAMBA4_ENT_TYPE_ANY:
 955                 /* Can't happen */
 956                 return EINVAL;
 957         case HDB_SAMBA4_ENT_TYPE_KRBTGT:
 958                 filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(samAccountName=%s))",
 959                                          KRB5_TGS_NAME);
 960                 break;
 961         case HDB_SAMBA4_ENT_TYPE_SERVER:
 962                 filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(samAccountName=%s))",
 963                                          short_princ_talloc);
 964                 break;
 965         }
 966
 967         if (!filter) {
 968                 krb5_set_error_string(context, "talloc_asprintf: out of memory");
 969                 return ENOMEM;
 970         }
 971
 972         lret = ldb_search(ldb_ctx, mem_ctx, &res, realm_dn,
 973                           LDB_SCOPE_SUBTREE, princ_attrs, "%s", filter);
 974         if (lret != LDB_SUCCESS) {
 975                 DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx)));
 976                 return HDB_ERR_NOENTRY;
 977         } else if (res->count == 0 || res->count > 1) {
 978                 DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count));
 979                 talloc_free(res);
 980                 return HDB_ERR_NOENTRY;
 981         }
 982         talloc_steal(mem_ctx, res->msgs);
 983         *pmsg = res->msgs;
 984         talloc_free(res);
 985         return 0;
 986 }
 987
 988 static krb5_error_code LDB_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
 989                                         TALLOC_CTX *mem_ctx,
 990                                         const char *realm,
 991                                         struct ldb_dn *realm_dn,
 992                                         struct ldb_message ***pmsg)
 993 {
 994         int lret;
 995         char *filter = NULL;
 996         const char * const *attrs = trust_attrs;
 997
 998         struct ldb_result *res = NULL;
 999         filter = talloc_asprintf(mem_ctx, "(&(objectClass=trustedDomain)(|(flatname=%s)(trustPartner=%s)))", realm, realm);
1000
1001         if (!filter) {
1002                 krb5_set_error_string(context, "talloc_asprintf: out of memory");
1003                 return ENOMEM;
1004         }
1005
1006         lret = ldb_search(ldb_ctx, mem_ctx, &res,
1007                           ldb_get_default_basedn(ldb_ctx),
1008                           LDB_SCOPE_SUBTREE, attrs, "%s", filter);
1009         if (lret != LDB_SUCCESS) {
1010                 DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx)));
1011                 return HDB_ERR_NOENTRY;
1012         } else if (res->count == 0 || res->count > 1) {
1013                 DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count));
1014                 talloc_free(res);
1015                 return HDB_ERR_NOENTRY;
1016         }
1017         talloc_steal(mem_ctx, res->msgs);
1018         *pmsg = res->msgs;
1019         talloc_free(res);
1020         return 0;
1021 }
1022
1023 static krb5_error_code LDB_open(krb5_context context, HDB *db, int flags, mode_t mode)
1024 {
1025         if (db->hdb_master_key_set) {
1026                 krb5_warnx(context, "LDB_open: use of a master key incompatible with LDB\n");
1027                 krb5_set_error_string(context, "LDB_open: use of a master key incompatible with LDB\n");
1028                 return HDB_ERR_NOENTRY;
1029         }
1030
1031         return 0;
1032 }
1033
1034 static krb5_error_code LDB_close(krb5_context context, HDB *db)
1035 {
1036         return 0;
1037 }
1038
1039 static krb5_error_code LDB_lock(krb5_context context, HDB *db, int operation)
1040 {
1041         return 0;
1042 }
1043
1044 static krb5_error_code LDB_unlock(krb5_context context, HDB *db)
1045 {
1046         return 0;
1047 }
1048
1049 static krb5_error_code LDB_rename(krb5_context context, HDB *db, const char *new_name)
1050 {
1051         return HDB_ERR_DB_INUSE;
1052 }
1053
1054 static krb5_error_code LDB_fetch_client(krb5_context context, HDB *db,
1055                                         TALLOC_CTX *mem_ctx,
1056                                         krb5_const_principal principal,
1057                                         unsigned flags,
1058                                         hdb_entry_ex *entry_ex) {
1059         NTSTATUS nt_status;
1060         char *principal_string;
1061         struct ldb_dn *realm_dn;
1062         krb5_error_code ret;
1063         struct ldb_message **msg = NULL;
1064
1065         ret = krb5_unparse_name(context, principal, &principal_string);
1066
1067         if (ret != 0) {
1068                 return ret;
1069         }
1070
1071         nt_status = sam_get_results_principal((struct ldb_context *)db->hdb_db,
1072                                               mem_ctx, principal_string,
1073                                               &realm_dn, &msg);
1074         free(principal_string);
1075         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1076                 return HDB_ERR_NOENTRY;
1077         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1078                 return ENOMEM;
1079         } else if (!NT_STATUS_IS_OK(nt_status)) {
1080                 return EINVAL;
1081         }
1082
1083         ret = LDB_message2entry(context, db, mem_ctx,
1084                                 principal, HDB_SAMBA4_ENT_TYPE_CLIENT,
1085                                 realm_dn, msg[0], entry_ex);
1086         return ret;
1087 }
1088
1089 static krb5_error_code LDB_fetch_krbtgt(krb5_context context, HDB *db,
1090                                         TALLOC_CTX *mem_ctx,
1091                                         krb5_const_principal principal,
1092                                         unsigned flags,
1093                                         hdb_entry_ex *entry_ex)
1094 {
1095         krb5_error_code ret;
1096         struct ldb_message **msg = NULL;
1097         struct ldb_dn *realm_dn = ldb_get_default_basedn(db->hdb_db);
1098         const char *realm;
1099         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(db->hdb_db, "loadparm"), struct loadparm_context);
1100
1101         krb5_principal alloc_principal = NULL;
1102         if (principal->name.name_string.len != 2
1103             || (strcmp(principal->name.name_string.val[0], KRB5_TGS_NAME) != 0)) {
1104                 /* Not a krbtgt */
1105                 return HDB_ERR_NOENTRY;
1106         }
1107
1108         /* krbtgt case.  Either us or a trusted realm */
1109
1110         if (lp_is_my_domain_or_realm(lp_ctx, principal->realm)
1111             && lp_is_my_domain_or_realm(lp_ctx, principal->name.name_string.val[1])) {
1112                 /* us */
1113                 /* Cludge, cludge cludge.  If the realm part of krbtgt/realm,
1114                  * is in our db, then direct the caller at our primary
1115                  * krbtgt */
1116
1117                 char *realm_fixed = strupper_talloc(mem_ctx, lp_realm(lp_ctx));
1118                 if (!realm_fixed) {
1119                         krb5_set_error_string(context, "strupper_talloc: out of memory");
1120                         return ENOMEM;
1121                 }
1122
1123                 ret = krb5_copy_principal(context, principal, &alloc_principal);
1124                 if (ret) {
1125                         return ret;
1126                 }
1127
1128                 free(alloc_principal->name.name_string.val[1]);
1129                 alloc_principal->name.name_string.val[1] = strdup(realm_fixed);
1130                 talloc_free(realm_fixed);
1131                 if (!alloc_principal->name.name_string.val[1]) {
1132                         krb5_set_error_string(context, "LDB_fetch: strdup() failed!");
1133                         return ENOMEM;
1134                 }
1135                 principal = alloc_principal;
1136
1137                 ret = LDB_lookup_principal(context, (struct ldb_context *)db->hdb_db,
1138                                            mem_ctx,
1139                                            principal, HDB_SAMBA4_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_SAMBA4_ENT_TYPE_KRBTGT,
1149                                         realm_dn, msg[0], entry_ex);
1150                 if (ret != 0) {
1151                         krb5_warnx(context, "LDB_fetch: self krbtgt message2entry failed");
1152                 }
1153                 return ret;
1154
1155         } else {
1156                 enum trust_direction direction = UNKNOWN;
1157
1158                 /* Either an inbound or outbound trust */
1159
1160                 if (strcasecmp(lp_realm(lp_ctx), principal->realm) == 0) {
1161                         /* look for inbound trust */
1162                         direction = INBOUND;
1163                         realm = principal->name.name_string.val[1];
1164                 }
1165
1166                 if (strcasecmp(lp_realm(lp_ctx), principal->name.name_string.val[1]) == 0) {
1167                         /* look for outbound trust */
1168                         direction = OUTBOUND;
1169                         realm = principal->realm;
1170                 }
1171
1172                 /* Trusted domains are under CN=system */
1173
1174                 ret = LDB_lookup_trust(context, (struct ldb_context *)db->hdb_db,
1175                                        mem_ctx,
1176                                        realm, realm_dn, &msg);
1177
1178                 if (ret != 0) {
1179                         krb5_warnx(context, "LDB_fetch: could not find principal in DB");
1180                         krb5_set_error_string(context, "LDB_fetch: could not find principal in DB");
1181                         return ret;
1182                 }
1183
1184                 ret = LDB_trust_message2entry(context, db, lp_ctx, mem_ctx,
1185                                               principal, direction,
1186                                               realm_dn, msg[0], entry_ex);
1187                 if (ret != 0) {
1188                         krb5_warnx(context, "LDB_fetch: trust_message2entry failed");
1189                 }
1190                 return ret;
1191
1192
1193                 /* we should lookup trusted domains */
1194                 return HDB_ERR_NOENTRY;
1195         }
1196
1197 }
1198
1199 static krb5_error_code LDB_fetch_server(krb5_context context, HDB *db,
1200                                         TALLOC_CTX *mem_ctx,
1201                                         krb5_const_principal principal,
1202                                         unsigned flags,
1203                                         hdb_entry_ex *entry_ex)
1204 {
1205         krb5_error_code ret;
1206         const char *realm;
1207         struct ldb_message **msg = NULL;
1208         struct ldb_dn *realm_dn;
1209         if (principal->name.name_string.len >= 2) {
1210                 /* 'normal server' case */
1211                 int ldb_ret;
1212                 NTSTATUS nt_status;
1213                 struct ldb_dn *user_dn;
1214                 char *principal_string;
1215
1216                 ret = krb5_unparse_name_flags(context, principal,
1217                                               KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1218                                               &principal_string);
1219                 if (ret != 0) {
1220                         return ret;
1221                 }
1222
1223                 /* At this point we may find the host is known to be
1224                  * in a different realm, so we should generate a
1225                  * referral instead */
1226                 nt_status = crack_service_principal_name((struct ldb_context *)db->hdb_db,
1227                                                          mem_ctx, principal_string,
1228                                                          &user_dn, &realm_dn);
1229                 free(principal_string);
1230
1231                 if (!NT_STATUS_IS_OK(nt_status)) {
1232                         return HDB_ERR_NOENTRY;
1233                 }
1234
1235                 ldb_ret = gendb_search_dn((struct ldb_context *)db->hdb_db,
1236                                           mem_ctx, user_dn, &msg, user_attrs);
1237
1238                 if (ldb_ret != 1) {
1239                         return HDB_ERR_NOENTRY;
1240                 }
1241
1242         } else {
1243                 /* server as client principal case, but we must not lookup userPrincipalNames */
1244                 realm_dn = ldb_get_default_basedn((struct ldb_context *)db->hdb_db);
1245                 realm = krb5_principal_get_realm(context, principal);
1246
1247                 /* Check if it is our realm, otherwise give referall */
1248
1249                 ret = LDB_lookup_principal(context, (struct ldb_context *)db->hdb_db,
1250                                            mem_ctx,
1251                                            principal, HDB_SAMBA4_ENT_TYPE_SERVER, realm_dn, &msg);
1252
1253                 if (ret != 0) {
1254                         return ret;
1255                 }
1256         }
1257
1258         ret = LDB_message2entry(context, db, mem_ctx,
1259                                 principal, HDB_SAMBA4_ENT_TYPE_SERVER,
1260                                 realm_dn, msg[0], entry_ex);
1261         if (ret != 0) {
1262                 krb5_warnx(context, "LDB_fetch: message2entry failed");
1263         }
1264
1265         return ret;
1266 }
1267
1268 static krb5_error_code LDB_fetch(krb5_context context, HDB *db,
1269                                  krb5_const_principal principal,
1270                                  unsigned flags,
1271                                  hdb_entry_ex *entry_ex)
1272 {
1273         krb5_error_code ret = HDB_ERR_NOENTRY;
1274
1275         TALLOC_CTX *mem_ctx = talloc_named(db, 0, "LDB_fetch context");
1276
1277         if (!mem_ctx) {
1278                 krb5_set_error_string(context, "LDB_fetch: talloc_named() failed!");
1279                 return ENOMEM;
1280         }
1281
1282         if (flags & HDB_F_GET_CLIENT) {
1283                 ret = LDB_fetch_client(context, db, mem_ctx, principal, flags, entry_ex);
1284                 if (ret != HDB_ERR_NOENTRY) goto done;
1285         }
1286         if (flags & HDB_F_GET_SERVER) {
1287                 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
1288                 ret = LDB_fetch_krbtgt(context, db, mem_ctx, principal, flags, entry_ex);
1289                 if (ret != HDB_ERR_NOENTRY) goto done;
1290
1291                 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
1292                 ret = LDB_fetch_server(context, db, mem_ctx, principal, flags, entry_ex);
1293                 if (ret != HDB_ERR_NOENTRY) goto done;
1294         }
1295         if (flags & HDB_F_GET_KRBTGT) {
1296                 ret = LDB_fetch_krbtgt(context, db, mem_ctx, principal, flags, entry_ex);
1297                 if (ret != HDB_ERR_NOENTRY) goto done;
1298         }
1299
1300 done:
1301         talloc_free(mem_ctx);
1302         return ret;
1303 }
1304
1305 static krb5_error_code LDB_store(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
1306 {
1307         return HDB_ERR_DB_INUSE;
1308 }
1309
1310 static krb5_error_code LDB_remove(krb5_context context, HDB *db, krb5_const_principal principal)
1311 {
1312         return HDB_ERR_DB_INUSE;
1313 }
1314
1315 struct hdb_ldb_seq {
1316         struct ldb_context *ctx;
1317         int index;
1318         int count;
1319         struct ldb_message **msgs;
1320         struct ldb_dn *realm_dn;
1321 };
1322
1323 static krb5_error_code LDB_seq(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
1324 {
1325         krb5_error_code ret;
1326         struct hdb_ldb_seq *priv = (struct hdb_ldb_seq *)db->hdb_dbc;
1327         TALLOC_CTX *mem_ctx;
1328         hdb_entry_ex entry_ex;
1329         memset(&entry_ex, '\0', sizeof(entry_ex));
1330
1331         if (!priv) {
1332                 return HDB_ERR_NOENTRY;
1333         }
1334
1335         mem_ctx = talloc_named(priv, 0, "LDB_seq context");
1336
1337         if (!mem_ctx) {
1338                 krb5_set_error_string(context, "LDB_seq: talloc_named() failed!");
1339                 return ENOMEM;
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                 krb5_set_error_string(context, "talloc: out of memory");
1379                 return ENOMEM;
1380         }
1381
1382         priv->ctx = ldb_ctx;
1383         priv->index = 0;
1384         priv->msgs = NULL;
1385         priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
1386         priv->count = 0;
1387
1388         mem_ctx = talloc_named(priv, 0, "LDB_firstkey context");
1389
1390         if (!mem_ctx) {
1391                 krb5_set_error_string(context, "LDB_firstkey: talloc_named() failed!");
1392                 return ENOMEM;
1393         }
1394
1395         ret = krb5_get_default_realm(context, &realm);
1396         if (ret != 0) {
1397                 talloc_free(priv);
1398                 return ret;
1399         }
1400
1401         lret = ldb_search(ldb_ctx, priv, &res,
1402                           priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
1403                           "(objectClass=user)");
1404
1405         if (lret != LDB_SUCCESS) {
1406                 talloc_free(priv);
1407                 return HDB_ERR_NOENTRY;
1408         }
1409
1410         priv->count = res->count;
1411         priv->msgs = talloc_steal(priv, res->msgs);
1412         talloc_free(res);
1413
1414         db->hdb_dbc = priv;
1415
1416         ret = LDB_seq(context, db, flags, entry);
1417
1418         if (ret != 0) {
1419                 talloc_free(priv);
1420                 db->hdb_dbc = NULL;
1421         } else {
1422                 talloc_free(mem_ctx);
1423         }
1424         return ret;
1425 }
1426
1427 static krb5_error_code LDB_nextkey(krb5_context context, HDB *db, unsigned flags,
1428                                    hdb_entry_ex *entry)
1429 {
1430         return LDB_seq(context, db, flags, entry);
1431 }
1432
1433 static krb5_error_code LDB_destroy(krb5_context context, HDB *db)
1434 {
1435         talloc_free(db);
1436         return 0;
1437 }
1438
1439 /* This interface is to be called by the KDC, which is expecting Samba
1440  * calling conventions.  It is also called by a wrapper
1441  * (hdb_ldb_create) from the kpasswdd -> krb5 -> keytab_hdb -> hdb
1442  * code */
1443
1444 NTSTATUS kdc_hdb_samba4_create(TALLOC_CTX *mem_ctx,
1445                             struct tevent_context *ev_ctx,
1446                             struct loadparm_context *lp_ctx,
1447                             krb5_context context, struct HDB **db, const char *arg)
1448 {
1449         NTSTATUS nt_status;
1450         struct auth_session_info *session_info;
1451         *db = talloc(mem_ctx, HDB);
1452         if (!*db) {
1453                 krb5_set_error_string(context, "malloc: out of memory");
1454                 return NT_STATUS_NO_MEMORY;
1455         }
1456
1457         (*db)->hdb_master_key_set = 0;
1458         (*db)->hdb_db = NULL;
1459
1460         nt_status = auth_system_session_info(*db, lp_ctx, &session_info);
1461         if (!NT_STATUS_IS_OK(nt_status)) {
1462                 return nt_status;
1463         }
1464
1465         /* The idea here is very simple.  Using Kerberos to
1466          * authenticate the KDC to the LDAP server is higly likely to
1467          * be circular.
1468          *
1469          * In future we may set this up to use EXERNAL and SSL
1470          * certificates, for now it will almost certainly be NTLMSSP
1471         */
1472
1473         cli_credentials_set_kerberos_state(session_info->credentials,
1474                                            CRED_DONT_USE_KERBEROS);
1475
1476         /* Setup the link to LDB */
1477         (*db)->hdb_db = samdb_connect(*db, ev_ctx, lp_ctx, session_info);
1478         if ((*db)->hdb_db == NULL) {
1479                 DEBUG(1, ("hdb_ldb_create: Cannot open samdb for KDC backend!"));
1480                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1481         }
1482
1483         (*db)->hdb_dbc = NULL;
1484         (*db)->hdb_open = LDB_open;
1485         (*db)->hdb_close = LDB_close;
1486         (*db)->hdb_fetch = LDB_fetch;
1487         (*db)->hdb_store = LDB_store;
1488         (*db)->hdb_remove = LDB_remove;
1489         (*db)->hdb_firstkey = LDB_firstkey;
1490         (*db)->hdb_nextkey = LDB_nextkey;
1491         (*db)->hdb_lock = LDB_lock;
1492         (*db)->hdb_unlock = LDB_unlock;
1493         (*db)->hdb_rename = LDB_rename;
1494         /* we don't implement these, as we are not a lockable database */
1495         (*db)->hdb__get = NULL;
1496         (*db)->hdb__put = NULL;
1497         /* kadmin should not be used for deletes - use other tools instead */
1498         (*db)->hdb__del = NULL;
1499         (*db)->hdb_destroy = LDB_destroy;
1500
1501         return NT_STATUS_OK;
1502 }
1503
1504 krb5_error_code hdb_samba4_create(krb5_context context, struct HDB **db, const char *arg)
1505 {
1506         NTSTATUS nt_status;
1507         /* The global kdc_mem_ctx and kdc_lp_ctx, Disgusting, ugly hack, but it means one less private hook */
1508         nt_status = kdc_hdb_samba4_create(kdc_mem_ctx, kdc_ev_ctx, kdc_lp_ctx,
1509                                           context, db, arg);
1510
1511         if (NT_STATUS_IS_OK(nt_status)) {
1512                 return 0;
1513         }
1514         return EINVAL;
1515 }