source4/kdc/hdb-samba4.c

   1 /*
   2  * Copyright (c) 1999-2001, 2003, PADL Software Pty Ltd.
   3  * Copyright (c) 2004, Andrew Bartlett <abartlet@samba.org>.
   4  * Copyright (c) 2004, Stefan Metzmacher <metze@samba.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * 3. Neither the name of PADL Software  nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "includes.h"
  36 #include "system/time.h"
  37 #include "dsdb/common/flags.h"
  38 #include "lib/ldb/include/ldb.h"
  39 #include "lib/ldb/include/ldb_errors.h"
  40 #include "librpc/gen_ndr/netlogon.h"
  41 #include "auth/auth.h"
  42 #include "auth/credentials/credentials.h"
  43 #include "auth/auth_sam.h"
  44 #include "../lib/util/util_ldb.h"
  45 #include "dsdb/samdb/samdb.h"
  46 #include "librpc/ndr/libndr.h"
  47 #include "librpc/gen_ndr/ndr_drsblobs.h"
  48 #include "librpc/gen_ndr/lsa.h"
  49 #include "libcli/auth/libcli_auth.h"
  50 #include "param/param.h"
  51 #include "events/events.h"
  52 #include "kdc/kdc.h"
  53 #include "../lib/crypto/md4.h"
  54
  55 enum hdb_ldb_ent_type
  56 { HDB_SAMBA4_ENT_TYPE_CLIENT, HDB_SAMBA4_ENT_TYPE_SERVER,
  57   HDB_SAMBA4_ENT_TYPE_KRBTGT, HDB_SAMBA4_ENT_TYPE_TRUST, HDB_SAMBA4_ENT_TYPE_ANY };
  58
  59 enum trust_direction {
  60         UNKNOWN = 0,
  61         INBOUND = LSA_TRUST_DIRECTION_INBOUND,
  62         OUTBOUND = LSA_TRUST_DIRECTION_OUTBOUND
  63 };
  64
  65 static const char *realm_ref_attrs[] = {
  66         "nCName",
  67         "dnsRoot",
  68         NULL
  69 };
  70
  71 static const char *trust_attrs[] = {
  72         "trustPartner",
  73         "trustAuthIncoming",
  74         "trustAuthOutgoing",
  75         "whenCreated",
  76         "msDS-SupportedEncryptionTypes",
  77         "trustAttributes",
  78         "trustDirection",
  79         "trustType",
  80         NULL
  81 };
  82
  83 static KerberosTime ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, KerberosTime default_val)
  84 {
  85     const char *tmp;
  86     const char *gentime;
  87     struct tm tm;
  88
  89     gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
  90     if (!gentime)
  91         return default_val;
  92
  93     tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
  94     if (tmp == NULL) {
  95             return default_val;
  96     }
  97
  98     return timegm(&tm);
  99 }
 100
 101 static HDBFlags uf2HDBFlags(krb5_context context, int userAccountControl, enum hdb_ldb_ent_type ent_type)
 102 {
 103         HDBFlags flags = int2HDBFlags(0);
 104
 105         /* we don't allow kadmin deletes */
 106         flags.immutable = 1;
 107
 108         /* mark the principal as invalid to start with */
 109         flags.invalid = 1;
 110
 111         flags.renewable = 1;
 112
 113         /* All accounts are servers, but this may be disabled again in the caller */
 114         flags.server = 1;
 115
 116         /* Account types - clear the invalid bit if it turns out to be valid */
 117         if (userAccountControl & UF_NORMAL_ACCOUNT) {
 118                 if (ent_type == HDB_SAMBA4_ENT_TYPE_CLIENT || ent_type == HDB_SAMBA4_ENT_TYPE_ANY) {
 119                         flags.client = 1;
 120                 }
 121                 flags.invalid = 0;
 122         }
 123
 124         if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
 125                 if (ent_type == HDB_SAMBA4_ENT_TYPE_CLIENT || ent_type == HDB_SAMBA4_ENT_TYPE_ANY) {
 126                         flags.client = 1;
 127                 }
 128                 flags.invalid = 0;
 129         }
 130         if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
 131                 if (ent_type == HDB_SAMBA4_ENT_TYPE_CLIENT || ent_type == HDB_SAMBA4_ENT_TYPE_ANY) {
 132                         flags.client = 1;
 133                 }
 134                 flags.invalid = 0;
 135         }
 136         if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
 137                 if (ent_type == HDB_SAMBA4_ENT_TYPE_CLIENT || ent_type == HDB_SAMBA4_ENT_TYPE_ANY) {
 138                         flags.client = 1;
 139                 }
 140                 flags.invalid = 0;
 141         }
 142
 143         /* Not permitted to act as a client if disabled */
 144         if (userAccountControl & UF_ACCOUNTDISABLE) {
 145                 flags.client = 0;
 146         }
 147         if (userAccountControl & UF_LOCKOUT) {
 148                 flags.invalid = 1;
 149         }
 150 /*
 151         if (userAccountControl & UF_PASSWORD_NOTREQD) {
 152                 flags.invalid = 1;
 153         }
 154 */
 155 /*
 156         UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
 157 */
 158         if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
 159                 flags.invalid = 1;
 160         }
 161
 162 /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in LDB_message2entry() */
 163
 164 /*
 165         if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
 166                 flags.invalid = 1;
 167         }
 168 */
 169         if (userAccountControl & UF_SMARTCARD_REQUIRED) {
 170                 flags.require_hwauth = 1;
 171         }
 172         if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
 173                 flags.ok_as_delegate = 1;
 174         }
 175         if (!(userAccountControl & UF_NOT_DELEGATED)) {
 176                 flags.forwardable = 1;
 177                 flags.proxiable = 1;
 178         }
 179
 180         if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
 181                 flags.require_preauth = 0;
 182         } else {
 183                 flags.require_preauth = 1;
 184
 185         }
 186         return flags;
 187 }
 188
 189 static int hdb_ldb_destructor(struct hdb_ldb_private *private)
 190 {
 191     hdb_entry_ex *entry_ex = private->entry_ex;
 192     free_hdb_entry(&entry_ex->entry);
 193     return 0;
 194 }
 195
 196 static void hdb_ldb_free_entry(krb5_context context, hdb_entry_ex *entry_ex)
 197 {
 198         talloc_free(entry_ex->ctx);
 199 }
 200
 201 static krb5_error_code LDB_message2entry_keys(krb5_context context,
 202                                               struct smb_iconv_convenience *iconv_convenience,
 203                                               TALLOC_CTX *mem_ctx,
 204                                               struct ldb_message *msg,
 205                                               unsigned int userAccountControl,
 206                                               hdb_entry_ex *entry_ex)
 207 {
 208         krb5_error_code ret = 0;
 209         enum ndr_err_code ndr_err;
 210         struct samr_Password *hash;
 211         const struct ldb_val *sc_val;
 212         struct supplementalCredentialsBlob scb;
 213         struct supplementalCredentialsPackage *scpk = NULL;
 214         bool newer_keys = false;
 215         struct package_PrimaryKerberosBlob _pkb;
 216         struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
 217         struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
 218         uint32_t i;
 219         uint32_t allocated_keys = 0;
 220
 221         entry_ex->entry.keys.val = NULL;
 222         entry_ex->entry.keys.len = 0;
 223
 224         entry_ex->entry.kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
 225
 226         /* Get keys from the db */
 227
 228         hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
 229         sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
 230
 231         /* unicodePwd for enctype 0x17 (23) if present */
 232         if (hash) {
 233                 allocated_keys++;
 234         }
 235
 236         /* supplementalCredentials if present */
 237         if (sc_val) {
 238                 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, iconv_convenience, &scb,
 239                                                    (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
 240                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 241                         dump_data(0, sc_val->data, sc_val->length);
 242                         ret = EINVAL;
 243                         goto out;
 244                 }
 245
 246                 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
 247                         NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
 248                         ret = EINVAL;
 249                         goto out;
 250                 }
 251
 252                 for (i=0; i < scb.sub.num_packages; i++) {
 253                         if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
 254                                 scpk = &scb.sub.packages[i];
 255                                 if (!scpk->data || !scpk->data[0]) {
 256                                         scpk = NULL;
 257                                         continue;
 258                                 }
 259                                 newer_keys = true;
 260                                 break;
 261                         } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
 262                                 scpk = &scb.sub.packages[i];
 263                                 if (!scpk->data || !scpk->data[0]) {
 264                                         scpk = NULL;
 265                                 }
 266                                 /*
 267                                  * we don't break here in hope to find
 268                                  * a Kerberos-Newer-Keys package
 269                                  */
 270                         }
 271                 }
 272         }
 273         /*
 274          * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
 275          * of supplementalCredentials
 276          */
 277         if (scpk) {
 278                 DATA_BLOB blob;
 279
 280                 blob = strhex_to_data_blob(mem_ctx, scpk->data);
 281                 if (!blob.data) {
 282                         ret = ENOMEM;
 283                         goto out;
 284                 }
 285
 286                 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
 287                 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, iconv_convenience, &_pkb,
 288                                                (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
 289                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 290                         krb5_set_error_string(context, "LDB_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 291                         krb5_warnx(context, "LDB_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 292                         ret = EINVAL;
 293                         goto out;
 294                 }
 295
 296                 if (newer_keys && _pkb.version != 4) {
 297                         krb5_set_error_string(context, "LDB_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 298                         krb5_warnx(context, "LDB_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 299                         ret = EINVAL;
 300                         goto out;
 301                 }
 302
 303                 if (!newer_keys && _pkb.version != 3) {
 304                         krb5_set_error_string(context, "LDB_message2entry_keys: could not parse Primary:Kerberos not version 3");
 305                         krb5_warnx(context, "LDB_message2entry_keys: could not parse Primary:Kerberos not version 3");
 306                         ret = EINVAL;
 307                         goto out;
 308                 }
 309
 310                 if (_pkb.version == 4) {
 311                         pkb4 = &_pkb.ctr.ctr4;
 312                         allocated_keys += pkb4->num_keys;
 313                 } else if (_pkb.version == 3) {
 314                         pkb3 = &_pkb.ctr.ctr3;
 315                         allocated_keys += pkb3->num_keys;
 316                 }
 317         }
 318
 319         if (allocated_keys == 0) {
 320                 /* oh, no password.  Apparently (comment in
 321                  * hdb-ldap.c) this violates the ASN.1, but this
 322                  * allows an entry with no keys (yet). */
 323                 return 0;
 324         }
 325
 326         /* allocate space to decode into */
 327         entry_ex->entry.keys.len = 0;
 328         entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(Key));
 329         if (entry_ex->entry.keys.val == NULL) {
 330                 ret = ENOMEM;
 331                 goto out;
 332         }
 333
 334         if (hash && !(userAccountControl & UF_USE_DES_KEY_ONLY)) {
 335                 Key key;
 336
 337                 key.mkvno = 0;
 338                 key.salt = NULL; /* No salt for this enc type */
 339
 340                 ret = krb5_keyblock_init(context,
 341                                          ENCTYPE_ARCFOUR_HMAC_MD5,
 342                                          hash->hash, sizeof(hash->hash),
 343                                          &key.key);
 344                 if (ret) {
 345                         goto out;
 346                 }
 347
 348                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 349                 entry_ex->entry.keys.len++;
 350         }
 351
 352         if (pkb4) {
 353                 for (i=0; i < pkb4->num_keys; i++) {
 354                         bool use = true;
 355                         Key key;
 356
 357                         if (!pkb4->keys[i].value) continue;
 358
 359                         if (userAccountControl & UF_USE_DES_KEY_ONLY) {
 360                                 switch (pkb4->keys[i].keytype) {
 361                                 case ENCTYPE_DES_CBC_CRC:
 362                                 case ENCTYPE_DES_CBC_MD5:
 363                                         break;
 364                                 default:
 365                                         use = false;
 366                                         break;
 367                                 }
 368                         }
 369
 370                         if (!use) continue;
 371
 372                         key.mkvno = 0;
 373                         key.salt = NULL;
 374
 375                         if (pkb4->salt.string) {
 376                                 DATA_BLOB salt;
 377
 378                                 salt = data_blob_string_const(pkb4->salt.string);
 379
 380                                 key.salt = calloc(1, sizeof(*key.salt));
 381                                 if (key.salt == NULL) {
 382                                         ret = ENOMEM;
 383                                         goto out;
 384                                 }
 385
 386                                 key.salt->type = hdb_pw_salt;
 387
 388                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
 389                                 if (ret) {
 390                                         free(key.salt);
 391                                         key.salt = NULL;
 392                                         goto out;
 393                                 }
 394                         }
 395
 396                         /* TODO: maybe pass the iteration_count somehow... */
 397
 398                         ret = krb5_keyblock_init(context,
 399                                                  pkb4->keys[i].keytype,
 400                                                  pkb4->keys[i].value->data,
 401                                                  pkb4->keys[i].value->length,
 402                                                  &key.key);
 403                         if (ret) {
 404                                 if (key.salt) {
 405                                         free_Salt(key.salt);
 406                                         free(key.salt);
 407                                         key.salt = NULL;
 408                                 }
 409                                 goto out;
 410                         }
 411
 412                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 413                         entry_ex->entry.keys.len++;
 414                 }
 415         } else if (pkb3) {
 416                 for (i=0; i < pkb3->num_keys; i++) {
 417                         bool use = true;
 418                         Key key;
 419
 420                         if (!pkb3->keys[i].value) continue;
 421
 422                         if (userAccountControl & UF_USE_DES_KEY_ONLY) {
 423                                 switch (pkb3->keys[i].keytype) {
 424                                 case ENCTYPE_DES_CBC_CRC:
 425                                 case ENCTYPE_DES_CBC_MD5:
 426                                         break;
 427                                 default:
 428                                         use = false;
 429                                         break;
 430                                 }
 431                         }
 432
 433                         if (!use) continue;
 434
 435                         key.mkvno = 0;
 436                         key.salt = NULL;
 437
 438                         if (pkb3->salt.string) {
 439                                 DATA_BLOB salt;
 440
 441                                 salt = data_blob_string_const(pkb3->salt.string);
 442
 443                                 key.salt = calloc(1, sizeof(*key.salt));
 444                                 if (key.salt == NULL) {
 445                                         ret = ENOMEM;
 446                                         goto out;
 447                                 }
 448
 449                                 key.salt->type = hdb_pw_salt;
 450
 451                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
 452                                 if (ret) {
 453                                         free(key.salt);
 454                                         key.salt = NULL;
 455                                         goto out;
 456                                 }
 457                         }
 458
 459                         ret = krb5_keyblock_init(context,
 460                                                  pkb3->keys[i].keytype,
 461                                                  pkb3->keys[i].value->data,
 462                                                  pkb3->keys[i].value->length,
 463                                                  &key.key);
 464                         if (ret) {
 465                                 if (key.salt) {
 466                                         free_Salt(key.salt);
 467                                         free(key.salt);
 468                                         key.salt = NULL;
 469                                 }
 470                                 goto out;
 471                         }
 472
 473                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 474                         entry_ex->entry.keys.len++;
 475                 }
 476         }
 477
 478 out:
 479         if (ret != 0) {
 480                 entry_ex->entry.keys.len = 0;
 481         }
 482         if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
 483                 free(entry_ex->entry.keys.val);
 484                 entry_ex->entry.keys.val = NULL;
 485         }
 486         return ret;
 487 }
 488
 489 /*
 490  * Construct an hdb_entry from a directory entry.
 491  */
 492 static krb5_error_code LDB_message2entry(krb5_context context, HDB *db,
 493                                          TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 494                                          enum hdb_ldb_ent_type ent_type,
 495                                          struct ldb_message *msg,
 496                                          struct ldb_message *realm_ref_msg,
 497                                          hdb_entry_ex *entry_ex)
 498 {
 499         unsigned int userAccountControl;
 500         int i;
 501         krb5_error_code ret = 0;
 502         krb5_boolean is_computer = FALSE;
 503         const char *dnsdomain = ldb_msg_find_attr_as_string(realm_ref_msg, "dnsRoot", NULL);
 504         char *realm = strupper_talloc(mem_ctx, dnsdomain);
 505         struct loadparm_context *lp_ctx = ldb_get_opaque((struct ldb_context *)db->hdb_db, "loadparm");
 506         struct ldb_dn *domain_dn = samdb_result_dn((struct ldb_context *)db->hdb_db,
 507                                                         mem_ctx,
 508                                                         realm_ref_msg,
 509                                                         "nCName",
 510                                                         ldb_dn_new(mem_ctx, (struct ldb_context *)db->hdb_db, NULL));
 511
 512         struct hdb_ldb_private *private;
 513         NTTIME acct_expiry;
 514
 515         struct ldb_message_element *objectclasses;
 516         struct ldb_val computer_val;
 517         computer_val.data = discard_const_p(uint8_t,"computer");
 518         computer_val.length = strlen((const char *)computer_val.data);
 519
 520         objectclasses = ldb_msg_find_element(msg, "objectClass");
 521
 522         if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
 523                 is_computer = TRUE;
 524         }
 525
 526         memset(entry_ex, 0, sizeof(*entry_ex));
 527
 528         if (!realm) {
 529                 krb5_set_error_string(context, "talloc_strdup: out of memory");
 530                 ret = ENOMEM;
 531                 goto out;
 532         }
 533
 534         private = talloc(mem_ctx, struct hdb_ldb_private);
 535         if (!private) {
 536                 ret = ENOMEM;
 537                 goto out;
 538         }
 539
 540         private->entry_ex = entry_ex;
 541         private->iconv_convenience = lp_iconv_convenience(lp_ctx);
 542         private->netbios_name = lp_netbios_name(lp_ctx);
 543
 544         talloc_set_destructor(private, hdb_ldb_destructor);
 545
 546         entry_ex->ctx = private;
 547         entry_ex->free_entry = hdb_ldb_free_entry;
 548
 549         userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
 550
 551
 552         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 553         if (ent_type == HDB_SAMBA4_ENT_TYPE_ANY && principal == NULL) {
 554                 const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
 555                 if (!samAccountName) {
 556                         krb5_set_error_string(context, "LDB_message2entry: no samAccountName present");
 557                         ret = ENOENT;
 558                         goto out;
 559                 }
 560                 samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
 561                 krb5_make_principal(context, &entry_ex->entry.principal, realm, samAccountName, NULL);
 562         } else {
 563                 char *strdup_realm;
 564                 ret = copy_Principal(principal, entry_ex->entry.principal);
 565                 if (ret) {
 566                         krb5_clear_error_string(context);
 567                         goto out;
 568                 }
 569
 570                 /* While we have copied the client principal, tests
 571                  * show that Win2k3 returns the 'corrected' realm, not
 572                  * the client-specified realm.  This code attempts to
 573                  * replace the client principal's realm with the one
 574                  * we determine from our records */
 575
 576                 /* this has to be with malloc() */
 577                 strdup_realm = strdup(realm);
 578                 if (!strdup_realm) {
 579                         ret = ENOMEM;
 580                         krb5_clear_error_string(context);
 581                         goto out;
 582                 }
 583                 free(*krb5_princ_realm(context, entry_ex->entry.principal));
 584                 krb5_princ_set_realm(context, entry_ex->entry.principal, &strdup_realm);
 585         }
 586
 587         entry_ex->entry.flags = uf2HDBFlags(context, userAccountControl, ent_type);
 588
 589         if (ent_type == HDB_SAMBA4_ENT_TYPE_KRBTGT) {
 590                 entry_ex->entry.flags.invalid = 0;
 591                 entry_ex->entry.flags.server = 1;
 592                 entry_ex->entry.flags.forwardable = 1;
 593                 entry_ex->entry.flags.ok_as_delegate = 1;
 594         }
 595
 596         if (lp_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
 597                 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
 598                         entry_ex->entry.flags.server = 0;
 599                 }
 600         }
 601
 602         /* use 'whenCreated' */
 603         entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 604         /* use '???' */
 605         entry_ex->entry.created_by.principal = NULL;
 606
 607         entry_ex->entry.modified_by = (Event *) malloc(sizeof(Event));
 608         if (entry_ex->entry.modified_by == NULL) {
 609                 krb5_set_error_string(context, "malloc: out of memory");
 610                 ret = ENOMEM;
 611                 goto out;
 612         }
 613
 614         /* use 'whenChanged' */
 615         entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
 616         /* use '???' */
 617         entry_ex->entry.modified_by->principal = NULL;
 618
 619         entry_ex->entry.valid_start = NULL;
 620
 621         acct_expiry = samdb_result_account_expires(msg);
 622         if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
 623                 entry_ex->entry.valid_end = NULL;
 624         } else {
 625                 entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
 626                 if (entry_ex->entry.valid_end == NULL) {
 627                         ret = ENOMEM;
 628                         goto out;
 629                 }
 630                 *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
 631         }
 632
 633         if (ent_type != HDB_SAMBA4_ENT_TYPE_KRBTGT) {
 634                 NTTIME must_change_time
 635                         = samdb_result_force_password_change((struct ldb_context *)db->hdb_db, mem_ctx,
 636                                                              domain_dn, msg);
 637                 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
 638                         entry_ex->entry.pw_end = NULL;
 639                 } else {
 640                         entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
 641                         if (entry_ex->entry.pw_end == NULL) {
 642                                 ret = ENOMEM;
 643                                 goto out;
 644                         }
 645                         *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
 646                 }
 647         } else {
 648                 entry_ex->entry.pw_end = NULL;
 649         }
 650
 651         entry_ex->entry.max_life = NULL;
 652
 653         entry_ex->entry.max_renew = NULL;
 654
 655         entry_ex->entry.generation = NULL;
 656
 657         /* Get keys from the db */
 658         ret = LDB_message2entry_keys(context, private->iconv_convenience, private, msg, userAccountControl, entry_ex);
 659         if (ret) {
 660                 /* Could be bougus data in the entry, or out of memory */
 661                 goto out;
 662         }
 663
 664         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 665         if (entry_ex->entry.etypes == NULL) {
 666                 krb5_clear_error_string(context);
 667                 ret = ENOMEM;
 668                 goto out;
 669         }
 670         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 671         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 672         if (entry_ex->entry.etypes->val == NULL) {
 673                 krb5_clear_error_string(context);
 674                 ret = ENOMEM;
 675                 goto out;
 676         }
 677         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 678                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 679         }
 680
 681
 682         private->msg = talloc_steal(private, msg);
 683         private->realm_ref_msg = talloc_steal(private, realm_ref_msg);
 684         private->samdb = (struct ldb_context *)db->hdb_db;
 685
 686 out:
 687         if (ret != 0) {
 688                 /* This doesn't free ent itself, that is for the eventual caller to do */
 689                 hdb_free_entry(context, entry_ex);
 690         } else {
 691                 talloc_steal(db, entry_ex->ctx);
 692         }
 693
 694         return ret;
 695 }
 696
 697 /*
 698  * Construct an hdb_entry from a directory entry.
 699  */
 700 static krb5_error_code LDB_trust_message2entry(krb5_context context, HDB *db,
 701                                                struct loadparm_context *lp_ctx,
 702                                                TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 703                                                enum trust_direction direction,
 704                                                struct ldb_message *msg,
 705                                                hdb_entry_ex *entry_ex)
 706 {
 707
 708         const char *dnsdomain;
 709         char *realm;
 710         char *strdup_realm;
 711         DATA_BLOB password_utf16;
 712         struct samr_Password password_hash;
 713         const struct ldb_val *password_val;
 714         struct trustAuthInOutBlob password_blob;
 715         struct hdb_ldb_private *private;
 716
 717         enum ndr_err_code ndr_err;
 718         int i, ret, trust_direction_flags;
 719
 720         private = talloc(mem_ctx, struct hdb_ldb_private);
 721         if (!private) {
 722                 ret = ENOMEM;
 723                 goto out;
 724         }
 725
 726         private->entry_ex = entry_ex;
 727         private->iconv_convenience = lp_iconv_convenience(lp_ctx);
 728         private->netbios_name = lp_netbios_name(lp_ctx);
 729
 730         talloc_set_destructor(private, hdb_ldb_destructor);
 731
 732         entry_ex->ctx = private;
 733         entry_ex->free_entry = hdb_ldb_free_entry;
 734
 735         /* use 'whenCreated' */
 736         entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 737         /* use '???' */
 738         entry_ex->entry.created_by.principal = NULL;
 739
 740         entry_ex->entry.valid_start = NULL;
 741
 742         trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
 743
 744         if (direction == INBOUND) {
 745                 realm = strupper_talloc(mem_ctx, lp_realm(lp_ctx));
 746                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
 747
 748         } else { /* OUTBOUND */
 749                 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
 750                 realm = strupper_talloc(mem_ctx, dnsdomain);
 751                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
 752         }
 753
 754         if (!password_val || !(trust_direction_flags & direction)) {
 755                 ret = ENOENT;
 756                 goto out;
 757         }
 758
 759         ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, private->iconv_convenience, &password_blob,
 760                                            (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
 761         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 762                 ret = EINVAL;
 763                 goto out;
 764         }
 765
 766         entry_ex->entry.kvno = -1;
 767         for (i=0; i < password_blob.count; i++) {
 768                 if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_VERSION) {
 769                         entry_ex->entry.kvno = password_blob.current->array[i].AuthInfo.version.version;
 770                 }
 771         }
 772
 773         for (i=0; i < password_blob.count; i++) {
 774                 if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
 775                         password_utf16 = data_blob_const(password_blob.current->array[i].AuthInfo.clear.password,
 776                                                          password_blob.current->array[i].AuthInfo.clear.size);
 777                         /* In the future, generate all sorts of
 778                          * hashes, but for now we can't safely convert
 779                          * the random strings windows uses into
 780                          * utf8 */
 781
 782                         /* but as it is utf16 already, we can get the NT password/arcfour-hmac-md5 key */
 783                         mdfour(password_hash.hash, password_utf16.data, password_utf16.length);
 784                         break;
 785                 } else if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
 786                         password_hash = password_blob.current->array[i].AuthInfo.nt4owf.password;
 787                         break;
 788                 }
 789         }
 790         entry_ex->entry.keys.len = 0;
 791         entry_ex->entry.keys.val = NULL;
 792
 793         if (i < password_blob.count) {
 794                 Key key;
 795                 /* Must have found a cleartext or MD4 password */
 796                 entry_ex->entry.keys.val = calloc(1, sizeof(Key));
 797
 798                 key.mkvno = 0;
 799                 key.salt = NULL; /* No salt for this enc type */
 800
 801                 if (entry_ex->entry.keys.val == NULL) {
 802                         ret = ENOMEM;
 803                         goto out;
 804                 }
 805
 806                 ret = krb5_keyblock_init(context,
 807                                          ENCTYPE_ARCFOUR_HMAC_MD5,
 808                                          password_hash.hash, sizeof(password_hash.hash),
 809                                          &key.key);
 810
 811                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 812                 entry_ex->entry.keys.len++;
 813         }
 814
 815         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 816
 817         ret = copy_Principal(principal, entry_ex->entry.principal);
 818         if (ret) {
 819                 krb5_clear_error_string(context);
 820                 goto out;
 821         }
 822
 823         /* While we have copied the client principal, tests
 824          * show that Win2k3 returns the 'corrected' realm, not
 825          * the client-specified realm.  This code attempts to
 826          * replace the client principal's realm with the one
 827          * we determine from our records */
 828
 829         /* this has to be with malloc() */
 830         strdup_realm = strdup(realm);
 831         if (!strdup_realm) {
 832                 ret = ENOMEM;
 833                 krb5_clear_error_string(context);
 834                 goto out;
 835         }
 836         free(*krb5_princ_realm(context, entry_ex->entry.principal));
 837         krb5_princ_set_realm(context, entry_ex->entry.principal, &strdup_realm);
 838
 839         entry_ex->entry.flags = int2HDBFlags(0);
 840         entry_ex->entry.flags.immutable = 1;
 841         entry_ex->entry.flags.invalid = 0;
 842         entry_ex->entry.flags.server = 1;
 843         entry_ex->entry.flags.require_preauth = 1;
 844
 845         entry_ex->entry.pw_end = NULL;
 846
 847         entry_ex->entry.max_life = NULL;
 848
 849         entry_ex->entry.max_renew = NULL;
 850
 851         entry_ex->entry.generation = NULL;
 852
 853         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 854         if (entry_ex->entry.etypes == NULL) {
 855                 krb5_clear_error_string(context);
 856                 ret = ENOMEM;
 857                 goto out;
 858         }
 859         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 860         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 861         if (entry_ex->entry.etypes->val == NULL) {
 862                 krb5_clear_error_string(context);
 863                 ret = ENOMEM;
 864                 goto out;
 865         }
 866         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 867                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 868         }
 869
 870
 871         private->msg = talloc_steal(private, msg);
 872         private->realm_ref_msg = NULL;
 873         private->samdb = (struct ldb_context *)db->hdb_db;
 874
 875 out:
 876         if (ret != 0) {
 877                 /* This doesn't free ent itself, that is for the eventual caller to do */
 878                 hdb_free_entry(context, entry_ex);
 879         } else {
 880                 talloc_steal(db, entry_ex->ctx);
 881         }
 882
 883         return ret;
 884
 885 }
 886
 887 static krb5_error_code LDB_lookup_principal(krb5_context context, struct ldb_context *ldb_ctx,
 888                                             TALLOC_CTX *mem_ctx,
 889                                             krb5_const_principal principal,
 890                                             enum hdb_ldb_ent_type ent_type,
 891                                             struct ldb_dn *realm_dn,
 892                                             struct ldb_message ***pmsg)
 893 {
 894         krb5_error_code ret;
 895         int lret;
 896         char *filter = NULL;
 897         const char * const *princ_attrs = user_attrs;
 898
 899         char *short_princ;
 900         char *short_princ_talloc;
 901
 902         struct ldb_result *res = NULL;
 903
 904         ret = krb5_unparse_name_flags(context, principal,  KRB5_PRINCIPAL_UNPARSE_NO_REALM, &short_princ);
 905
 906         if (ret != 0) {
 907                 krb5_set_error_string(context, "LDB_lookup_principal: could not parse principal");
 908                 krb5_warnx(context, "LDB_lookup_principal: could not parse principal");
 909                 return ret;
 910         }
 911
 912         short_princ_talloc = talloc_strdup(mem_ctx, short_princ);
 913         free(short_princ);
 914         if (!short_princ_talloc) {
 915                 krb5_set_error_string(context, "LDB_lookup_principal: talloc_strdup() failed!");
 916                 return ENOMEM;
 917         }
 918
 919         switch (ent_type) {
 920         case HDB_SAMBA4_ENT_TYPE_CLIENT:
 921         case HDB_SAMBA4_ENT_TYPE_TRUST:
 922         case HDB_SAMBA4_ENT_TYPE_ANY:
 923                 /* Can't happen */
 924                 return EINVAL;
 925         case HDB_SAMBA4_ENT_TYPE_KRBTGT:
 926                 filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(samAccountName=%s))",
 927                                          KRB5_TGS_NAME);
 928                 break;
 929         case HDB_SAMBA4_ENT_TYPE_SERVER:
 930                 filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(samAccountName=%s))",
 931                                          short_princ_talloc);
 932                 break;
 933         }
 934
 935         if (!filter) {
 936                 krb5_set_error_string(context, "talloc_asprintf: out of memory");
 937                 return ENOMEM;
 938         }
 939
 940         lret = ldb_search(ldb_ctx, mem_ctx, &res, realm_dn,
 941                           LDB_SCOPE_SUBTREE, princ_attrs, "%s", filter);
 942         if (lret != LDB_SUCCESS) {
 943                 DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx)));
 944                 return HDB_ERR_NOENTRY;
 945         } else if (res->count == 0 || res->count > 1) {
 946                 DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count));
 947                 talloc_free(res);
 948                 return HDB_ERR_NOENTRY;
 949         }
 950         talloc_steal(mem_ctx, res->msgs);
 951         *pmsg = res->msgs;
 952         talloc_free(res);
 953         return 0;
 954 }
 955
 956 static krb5_error_code LDB_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
 957                                         TALLOC_CTX *mem_ctx,
 958                                         const char *realm,
 959                                         struct ldb_dn *realm_dn,
 960                                         struct ldb_message ***pmsg)
 961 {
 962         int lret;
 963         char *filter = NULL;
 964         const char * const *attrs = trust_attrs;
 965
 966         struct ldb_result *res = NULL;
 967         filter = talloc_asprintf(mem_ctx, "(&(objectClass=trustedDomain)(|(flatname=%s)(trustPartner=%s)))", realm, realm);
 968
 969         if (!filter) {
 970                 krb5_set_error_string(context, "talloc_asprintf: out of memory");
 971                 return ENOMEM;
 972         }
 973
 974         lret = ldb_search(ldb_ctx, mem_ctx, &res,
 975                           ldb_get_default_basedn(ldb_ctx),
 976                           LDB_SCOPE_SUBTREE, attrs, "%s", filter);
 977         if (lret != LDB_SUCCESS) {
 978                 DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx)));
 979                 return HDB_ERR_NOENTRY;
 980         } else if (res->count == 0 || res->count > 1) {
 981                 DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count));
 982                 talloc_free(res);
 983                 return HDB_ERR_NOENTRY;
 984         }
 985         talloc_steal(mem_ctx, res->msgs);
 986         *pmsg = res->msgs;
 987         talloc_free(res);
 988         return 0;
 989 }
 990
 991 static krb5_error_code LDB_lookup_realm(krb5_context context, struct ldb_context *ldb_ctx,
 992                                         TALLOC_CTX *mem_ctx,
 993                                         const char *realm,
 994                                         struct ldb_message ***pmsg)
 995 {
 996         int ret;
 997         struct ldb_result *cross_ref_res;
 998         struct ldb_dn *partitions_basedn = samdb_partitions_dn(ldb_ctx, mem_ctx);
 999
1000         ret = ldb_search(ldb_ctx, mem_ctx, &cross_ref_res,
1001                         partitions_basedn, LDB_SCOPE_SUBTREE, realm_ref_attrs,
1002                         "(&(&(|(&(dnsRoot=%s)(nETBIOSName=*))(nETBIOSName=%s))(objectclass=crossRef))(ncName=*))",
1003                         realm, realm);
1004
1005         if (ret != LDB_SUCCESS) {
1006                 DEBUG(3, ("Failed to search to lookup realm(%s): %s\n", realm, ldb_errstring(ldb_ctx)));
1007                 talloc_free(cross_ref_res);
1008                 return HDB_ERR_NOENTRY;
1009         } else if (cross_ref_res->count == 0 || cross_ref_res->count > 1) {
1010                 DEBUG(3, ("Failed find a single entry for realm %s: got %d\n", realm, cross_ref_res->count));
1011                 talloc_free(cross_ref_res);
1012                 return HDB_ERR_NOENTRY;
1013         }
1014
1015         if (pmsg) {
1016                 *pmsg = cross_ref_res->msgs;
1017                 talloc_steal(mem_ctx, cross_ref_res->msgs);
1018         }
1019         talloc_free(cross_ref_res);
1020
1021         return 0;
1022 }
1023
1024
1025 static krb5_error_code LDB_open(krb5_context context, HDB *db, int flags, mode_t mode)
1026 {
1027         if (db->hdb_master_key_set) {
1028                 krb5_warnx(context, "LDB_open: use of a master key incompatible with LDB\n");
1029                 krb5_set_error_string(context, "LDB_open: use of a master key incompatible with LDB\n");
1030                 return HDB_ERR_NOENTRY;
1031         }
1032
1033         return 0;
1034 }
1035
1036 static krb5_error_code LDB_close(krb5_context context, HDB *db)
1037 {
1038         return 0;
1039 }
1040
1041 static krb5_error_code LDB_lock(krb5_context context, HDB *db, int operation)
1042 {
1043         return 0;
1044 }
1045
1046 static krb5_error_code LDB_unlock(krb5_context context, HDB *db)
1047 {
1048         return 0;
1049 }
1050
1051 static krb5_error_code LDB_rename(krb5_context context, HDB *db, const char *new_name)
1052 {
1053         return HDB_ERR_DB_INUSE;
1054 }
1055
1056 static krb5_error_code LDB_fetch_client(krb5_context context, HDB *db,
1057                                         TALLOC_CTX *mem_ctx,
1058                                         krb5_const_principal principal,
1059                                         unsigned flags,
1060                                         hdb_entry_ex *entry_ex) {
1061         NTSTATUS nt_status;
1062         char *principal_string;
1063         krb5_error_code ret;
1064         struct ldb_message **msg = NULL;
1065         struct ldb_message **realm_ref_msg = NULL;
1066
1067         ret = krb5_unparse_name(context, principal, &principal_string);
1068
1069         if (ret != 0) {
1070                 return ret;
1071         }
1072
1073         nt_status = sam_get_results_principal((struct ldb_context *)db->hdb_db,
1074                                               mem_ctx, principal_string,
1075                                               &msg, &realm_ref_msg);
1076         free(principal_string);
1077         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1078                 return HDB_ERR_NOENTRY;
1079         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1080                 return ENOMEM;
1081         } else if (!NT_STATUS_IS_OK(nt_status)) {
1082                 return EINVAL;
1083         }
1084
1085         ret = LDB_message2entry(context, db, mem_ctx,
1086                                 principal, HDB_SAMBA4_ENT_TYPE_CLIENT,
1087                                 msg[0], realm_ref_msg[0], entry_ex);
1088         return ret;
1089 }
1090
1091 static krb5_error_code LDB_fetch_krbtgt(krb5_context context, HDB *db,
1092                                         TALLOC_CTX *mem_ctx,
1093                                         krb5_const_principal principal,
1094                                         unsigned flags,
1095                                         hdb_entry_ex *entry_ex)
1096 {
1097         krb5_error_code ret;
1098         struct ldb_message **msg = NULL;
1099         struct ldb_message **realm_ref_msg_1 = NULL;
1100         struct ldb_message **realm_ref_msg_2 = NULL;
1101         struct ldb_dn *realm_dn;
1102         const char *realm;
1103
1104         krb5_principal alloc_principal = NULL;
1105         if (principal->name.name_string.len != 2
1106             || (strcmp(principal->name.name_string.val[0], KRB5_TGS_NAME) != 0)) {
1107                 /* Not a krbtgt */
1108                 return HDB_ERR_NOENTRY;
1109         }
1110
1111         /* krbtgt case.  Either us or a trusted realm */
1112
1113         if ((LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db,
1114                               mem_ctx, principal->realm, &realm_ref_msg_1) == 0)
1115             && (LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db,
1116                                  mem_ctx, principal->name.name_string.val[1], &realm_ref_msg_2) == 0)
1117             && (ldb_dn_compare(realm_ref_msg_1[0]->dn, realm_ref_msg_1[0]->dn) == 0)) {
1118                 /* us */
1119                 /* Cludge, cludge cludge.  If the realm part of krbtgt/realm,
1120                  * is in our db, then direct the caller at our primary
1121                  * krbtgt */
1122
1123                 const char *dnsdomain = ldb_msg_find_attr_as_string(realm_ref_msg_1[0], "dnsRoot", NULL);
1124                 char *realm_fixed = strupper_talloc(mem_ctx, dnsdomain);
1125                 if (!realm_fixed) {
1126                         krb5_set_error_string(context, "strupper_talloc: out of memory");
1127                         return ENOMEM;
1128                 }
1129
1130                 ret = krb5_copy_principal(context, principal, &alloc_principal);
1131                 if (ret) {
1132                         return ret;
1133                 }
1134
1135                 free(alloc_principal->name.name_string.val[1]);
1136                 alloc_principal->name.name_string.val[1] = strdup(realm_fixed);
1137                 talloc_free(realm_fixed);
1138                 if (!alloc_principal->name.name_string.val[1]) {
1139                         krb5_set_error_string(context, "LDB_fetch: strdup() failed!");
1140                         return ENOMEM;
1141                 }
1142                 principal = alloc_principal;
1143                 realm_dn = samdb_result_dn((struct ldb_context *)db->hdb_db, mem_ctx, realm_ref_msg_1[0], "nCName", NULL);
1144
1145                 ret = LDB_lookup_principal(context, (struct ldb_context *)db->hdb_db,
1146                                            mem_ctx,
1147                                            principal, HDB_SAMBA4_ENT_TYPE_KRBTGT, realm_dn, &msg);
1148
1149                 if (ret != 0) {
1150                         krb5_warnx(context, "LDB_fetch: could not find principal in DB");
1151                         krb5_set_error_string(context, "LDB_fetch: could not find principal in DB");
1152                         return ret;
1153                 }
1154
1155                 ret = LDB_message2entry(context, db, mem_ctx,
1156                                         principal, HDB_SAMBA4_ENT_TYPE_KRBTGT,
1157                                         msg[0], realm_ref_msg_1[0], entry_ex);
1158                 if (ret != 0) {
1159                         krb5_warnx(context, "LDB_fetch: self krbtgt message2entry failed");
1160                 }
1161                 return ret;
1162
1163         } else {
1164                 enum trust_direction direction = UNKNOWN;
1165
1166                 struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(db->hdb_db, "loadparm"), struct loadparm_context);
1167                 /* Either an inbound or outbound trust */
1168
1169                 if (strcasecmp(lp_realm(lp_ctx), principal->realm) == 0) {
1170                         /* look for inbound trust */
1171                         direction = INBOUND;
1172                         realm = principal->name.name_string.val[1];
1173                 }
1174
1175                 if (strcasecmp(lp_realm(lp_ctx), principal->name.name_string.val[1]) == 0) {
1176                         /* look for outbound trust */
1177                         direction = OUTBOUND;
1178                         realm = principal->realm;
1179                 }
1180
1181                 /* Trusted domains are under CN=system */
1182
1183                 ret = LDB_lookup_trust(context, (struct ldb_context *)db->hdb_db,
1184                                        mem_ctx,
1185                                        realm, realm_dn, &msg);
1186
1187                 if (ret != 0) {
1188                         krb5_warnx(context, "LDB_fetch: could not find principal in DB");
1189                         krb5_set_error_string(context, "LDB_fetch: could not find principal in DB");
1190                         return ret;
1191                 }
1192
1193                 ret = LDB_trust_message2entry(context, db, lp_ctx, mem_ctx,
1194                                               principal, direction,
1195                                               msg[0], entry_ex);
1196                 if (ret != 0) {
1197                         krb5_warnx(context, "LDB_fetch: trust_message2entry failed");
1198                 }
1199                 return ret;
1200
1201
1202                 /* we should lookup trusted domains */
1203                 return HDB_ERR_NOENTRY;
1204         }
1205
1206 }
1207
1208 static krb5_error_code LDB_fetch_server(krb5_context context, HDB *db,
1209                                         TALLOC_CTX *mem_ctx,
1210                                         krb5_const_principal principal,
1211                                         unsigned flags,
1212                                         hdb_entry_ex *entry_ex)
1213 {
1214         krb5_error_code ret;
1215         const char *realm;
1216         struct ldb_message **msg = NULL;
1217         struct ldb_message **realm_ref_msg = NULL;
1218         struct ldb_dn *partitions_basedn = samdb_partitions_dn(db->hdb_db, mem_ctx);
1219         if (principal->name.name_string.len >= 2) {
1220                 /* 'normal server' case */
1221                 int ldb_ret;
1222                 NTSTATUS nt_status;
1223                 struct ldb_dn *user_dn, *domain_dn;
1224                 char *principal_string;
1225
1226                 ret = krb5_unparse_name_flags(context, principal,
1227                                               KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1228                                               &principal_string);
1229                 if (ret != 0) {
1230                         return ret;
1231                 }
1232
1233                 /* At this point we may find the host is known to be
1234                  * in a different realm, so we should generate a
1235                  * referral instead */
1236                 nt_status = crack_service_principal_name((struct ldb_context *)db->hdb_db,
1237                                                          mem_ctx, principal_string,
1238                                                          &user_dn, &domain_dn);
1239                 free(principal_string);
1240
1241                 if (!NT_STATUS_IS_OK(nt_status)) {
1242                         return HDB_ERR_NOENTRY;
1243                 }
1244
1245                 ldb_ret = gendb_search_dn((struct ldb_context *)db->hdb_db,
1246                                           mem_ctx, user_dn, &msg, user_attrs);
1247
1248                 if (ldb_ret != 1) {
1249                         return HDB_ERR_NOENTRY;
1250                 }
1251
1252                 ldb_ret = gendb_search((struct ldb_context *)db->hdb_db,
1253                                        mem_ctx, partitions_basedn, &realm_ref_msg, realm_ref_attrs,
1254                                        "ncName=%s", ldb_dn_get_linearized(domain_dn));
1255
1256                 if (ldb_ret != 1) {
1257                         return HDB_ERR_NOENTRY;
1258                 }
1259
1260         } else {
1261                 struct ldb_dn *realm_dn;
1262                 /* server as client principal case, but we must not lookup userPrincipalNames */
1263
1264                 realm = krb5_principal_get_realm(context, principal);
1265
1266                 ret = LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db,
1267                                        mem_ctx, realm, &realm_ref_msg);
1268                 if (ret != 0) {
1269                         return HDB_ERR_NOENTRY;
1270                 }
1271
1272                 realm_dn = samdb_result_dn((struct ldb_context *)db->hdb_db, mem_ctx, realm_ref_msg[0], "nCName", NULL);
1273
1274                 ret = LDB_lookup_principal(context, (struct ldb_context *)db->hdb_db,
1275                                            mem_ctx,
1276                                            principal, HDB_SAMBA4_ENT_TYPE_SERVER, realm_dn, &msg);
1277
1278                 if (ret != 0) {
1279                         return ret;
1280                 }
1281         }
1282
1283         ret = LDB_message2entry(context, db, mem_ctx,
1284                                 principal, HDB_SAMBA4_ENT_TYPE_SERVER,
1285                                 msg[0], realm_ref_msg[0], entry_ex);
1286         if (ret != 0) {
1287                 krb5_warnx(context, "LDB_fetch: message2entry failed");
1288         }
1289
1290         return ret;
1291 }
1292
1293 static krb5_error_code LDB_fetch(krb5_context context, HDB *db,
1294                                  krb5_const_principal principal,
1295                                  unsigned flags,
1296                                  hdb_entry_ex *entry_ex)
1297 {
1298         krb5_error_code ret = HDB_ERR_NOENTRY;
1299
1300         TALLOC_CTX *mem_ctx = talloc_named(db, 0, "LDB_fetch context");
1301
1302         if (!mem_ctx) {
1303                 krb5_set_error_string(context, "LDB_fetch: talloc_named() failed!");
1304                 return ENOMEM;
1305         }
1306
1307         if (flags & HDB_F_GET_CLIENT) {
1308                 ret = LDB_fetch_client(context, db, mem_ctx, principal, flags, entry_ex);
1309                 if (ret != HDB_ERR_NOENTRY) goto done;
1310         }
1311         if (flags & HDB_F_GET_SERVER) {
1312                 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
1313                 ret = LDB_fetch_krbtgt(context, db, mem_ctx, principal, flags, entry_ex);
1314                 if (ret != HDB_ERR_NOENTRY) goto done;
1315
1316                 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
1317                 ret = LDB_fetch_server(context, db, mem_ctx, principal, flags, entry_ex);
1318                 if (ret != HDB_ERR_NOENTRY) goto done;
1319         }
1320         if (flags & HDB_F_GET_KRBTGT) {
1321                 ret = LDB_fetch_krbtgt(context, db, mem_ctx, principal, flags, entry_ex);
1322                 if (ret != HDB_ERR_NOENTRY) goto done;
1323         }
1324
1325 done:
1326         talloc_free(mem_ctx);
1327         return ret;
1328 }
1329
1330 static krb5_error_code LDB_store(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
1331 {
1332         return HDB_ERR_DB_INUSE;
1333 }
1334
1335 static krb5_error_code LDB_remove(krb5_context context, HDB *db, krb5_const_principal principal)
1336 {
1337         return HDB_ERR_DB_INUSE;
1338 }
1339
1340 struct hdb_ldb_seq {
1341         struct ldb_context *ctx;
1342         int index;
1343         int count;
1344         struct ldb_message **msgs;
1345         struct ldb_message **realm_ref_msgs;
1346 };
1347
1348 static krb5_error_code LDB_seq(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
1349 {
1350         krb5_error_code ret;
1351         struct hdb_ldb_seq *priv = (struct hdb_ldb_seq *)db->hdb_dbc;
1352         TALLOC_CTX *mem_ctx;
1353         hdb_entry_ex entry_ex;
1354         memset(&entry_ex, '\0', sizeof(entry_ex));
1355
1356         if (!priv) {
1357                 return HDB_ERR_NOENTRY;
1358         }
1359
1360         mem_ctx = talloc_named(priv, 0, "LDB_seq context");
1361
1362         if (!mem_ctx) {
1363                 krb5_set_error_string(context, "LDB_seq: talloc_named() failed!");
1364                 return ENOMEM;
1365         }
1366
1367         if (priv->index < priv->count) {
1368                 ret = LDB_message2entry(context, db, mem_ctx,
1369                                         NULL, HDB_SAMBA4_ENT_TYPE_ANY,
1370                                         priv->msgs[priv->index++],
1371                                         priv->realm_ref_msgs[0], entry);
1372         } else {
1373                 ret = HDB_ERR_NOENTRY;
1374         }
1375
1376         if (ret != 0) {
1377                 talloc_free(priv);
1378                 db->hdb_dbc = NULL;
1379         } else {
1380                 talloc_free(mem_ctx);
1381         }
1382
1383         return ret;
1384 }
1385
1386 static krb5_error_code LDB_firstkey(krb5_context context, HDB *db, unsigned flags,
1387                                         hdb_entry_ex *entry)
1388 {
1389         struct ldb_context *ldb_ctx = (struct ldb_context *)db->hdb_db;
1390         struct hdb_ldb_seq *priv = (struct hdb_ldb_seq *)db->hdb_dbc;
1391         char *realm;
1392         struct ldb_dn *realm_dn = NULL;
1393         struct ldb_result *res = NULL;
1394         struct ldb_message **realm_ref_msgs = NULL;
1395         krb5_error_code ret;
1396         TALLOC_CTX *mem_ctx;
1397         int lret;
1398
1399         if (priv) {
1400                 talloc_free(priv);
1401                 db->hdb_dbc = NULL;
1402         }
1403
1404         priv = (struct hdb_ldb_seq *) talloc(db, struct hdb_ldb_seq);
1405         if (!priv) {
1406                 krb5_set_error_string(context, "talloc: out of memory");
1407                 return ENOMEM;
1408         }
1409
1410         priv->ctx = ldb_ctx;
1411         priv->index = 0;
1412         priv->msgs = NULL;
1413         priv->realm_ref_msgs = NULL;
1414         priv->count = 0;
1415
1416         mem_ctx = talloc_named(priv, 0, "LDB_firstkey context");
1417
1418         if (!mem_ctx) {
1419                 krb5_set_error_string(context, "LDB_firstkey: talloc_named() failed!");
1420                 return ENOMEM;
1421         }
1422
1423         ret = krb5_get_default_realm(context, &realm);
1424         if (ret != 0) {
1425                 talloc_free(priv);
1426                 return ret;
1427         }
1428
1429         ret = LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db,
1430                                mem_ctx, realm, &realm_ref_msgs);
1431
1432         free(realm);
1433
1434         if (ret != 0) {
1435                 talloc_free(priv);
1436                 krb5_warnx(context, "LDB_firstkey: could not find realm\n");
1437                 return HDB_ERR_NOENTRY;
1438         }
1439
1440         realm_dn = samdb_result_dn((struct ldb_context *)db->hdb_db, mem_ctx, realm_ref_msgs[0], "nCName", NULL);
1441
1442         priv->realm_ref_msgs = talloc_steal(priv, realm_ref_msgs);
1443
1444         lret = ldb_search(ldb_ctx, priv, &res,
1445                           realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
1446                           "(objectClass=user)");
1447
1448         if (lret != LDB_SUCCESS) {
1449                 talloc_free(priv);
1450                 return HDB_ERR_NOENTRY;
1451         }
1452
1453         priv->count = res->count;
1454         priv->msgs = talloc_steal(priv, res->msgs);
1455         talloc_free(res);
1456
1457         db->hdb_dbc = priv;
1458
1459         ret = LDB_seq(context, db, flags, entry);
1460
1461         if (ret != 0) {
1462                 talloc_free(priv);
1463                 db->hdb_dbc = NULL;
1464         } else {
1465                 talloc_free(mem_ctx);
1466         }
1467         return ret;
1468 }
1469
1470 static krb5_error_code LDB_nextkey(krb5_context context, HDB *db, unsigned flags,
1471                                    hdb_entry_ex *entry)
1472 {
1473         return LDB_seq(context, db, flags, entry);
1474 }
1475
1476 static krb5_error_code LDB_destroy(krb5_context context, HDB *db)
1477 {
1478         talloc_free(db);
1479         return 0;
1480 }
1481
1482 /* This interface is to be called by the KDC, which is expecting Samba
1483  * calling conventions.  It is also called by a wrapper
1484  * (hdb_ldb_create) from the kpasswdd -> krb5 -> keytab_hdb -> hdb
1485  * code */
1486
1487 NTSTATUS kdc_hdb_samba4_create(TALLOC_CTX *mem_ctx,
1488                             struct event_context *ev_ctx,
1489                             struct loadparm_context *lp_ctx,
1490                             krb5_context context, struct HDB **db, const char *arg)
1491 {
1492         NTSTATUS nt_status;
1493         struct auth_session_info *session_info;
1494         *db = talloc(mem_ctx, HDB);
1495         if (!*db) {
1496                 krb5_set_error_string(context, "malloc: out of memory");
1497                 return NT_STATUS_NO_MEMORY;
1498         }
1499
1500         (*db)->hdb_master_key_set = 0;
1501         (*db)->hdb_db = NULL;
1502
1503         nt_status = auth_system_session_info(*db, lp_ctx, &session_info);
1504         if (!NT_STATUS_IS_OK(nt_status)) {
1505                 return nt_status;
1506         }
1507
1508         /* The idea here is very simple.  Using Kerberos to
1509          * authenticate the KDC to the LDAP server is higly likely to
1510          * be circular.
1511          *
1512          * In future we may set this up to use EXERNAL and SSL
1513          * certificates, for now it will almost certainly be NTLMSSP
1514         */
1515
1516         cli_credentials_set_kerberos_state(session_info->credentials,
1517                                            CRED_DONT_USE_KERBEROS);
1518
1519         /* Setup the link to LDB */
1520         (*db)->hdb_db = samdb_connect(*db, ev_ctx, lp_ctx, session_info);
1521         if ((*db)->hdb_db == NULL) {
1522                 DEBUG(1, ("hdb_ldb_create: Cannot open samdb for KDC backend!"));
1523                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1524         }
1525
1526         (*db)->hdb_dbc = NULL;
1527         (*db)->hdb_open = LDB_open;
1528         (*db)->hdb_close = LDB_close;
1529         (*db)->hdb_fetch = LDB_fetch;
1530         (*db)->hdb_store = LDB_store;
1531         (*db)->hdb_remove = LDB_remove;
1532         (*db)->hdb_firstkey = LDB_firstkey;
1533         (*db)->hdb_nextkey = LDB_nextkey;
1534         (*db)->hdb_lock = LDB_lock;
1535         (*db)->hdb_unlock = LDB_unlock;
1536         (*db)->hdb_rename = LDB_rename;
1537         /* we don't implement these, as we are not a lockable database */
1538         (*db)->hdb__get = NULL;
1539         (*db)->hdb__put = NULL;
1540         /* kadmin should not be used for deletes - use other tools instead */
1541         (*db)->hdb__del = NULL;
1542         (*db)->hdb_destroy = LDB_destroy;
1543
1544         return NT_STATUS_OK;
1545 }
1546
1547 krb5_error_code hdb_samba4_create(krb5_context context, struct HDB **db, const char *arg)
1548 {
1549         NTSTATUS nt_status;
1550         /* The global kdc_mem_ctx and kdc_lp_ctx, Disgusting, ugly hack, but it means one less private hook */
1551         nt_status = kdc_hdb_samba4_create(kdc_mem_ctx, event_context_find(kdc_mem_ctx), kdc_lp_ctx,
1552                                           context, db, arg);
1553
1554         if (NT_STATUS_IS_OK(nt_status)) {
1555                 return 0;
1556         }
1557         return EINVAL;
1558 }