source4/kdc/db-glue.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Database Glue between Samba and the KDC
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2009
   7    Copyright (C) Simo Sorce <idra@samba.org> 2010
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "libcli/security/security.h"
  26 #include "auth/auth.h"
  27 #include "auth/auth_sam.h"
  28 #include "dsdb/samdb/samdb.h"
  29 #include "dsdb/common/util.h"
  30 #include "librpc/gen_ndr/ndr_drsblobs.h"
  31 #include "param/param.h"
  32 #include "../lib/crypto/md4.h"
  33 #include "system/kerberos.h"
  34 #include "auth/kerberos/kerberos.h"
  35 #include <hdb.h>
  36 #include "kdc/samba_kdc.h"
  37 #include "kdc/db-glue.h"
  38
  39 #define SAMBA_KVNO_GET_KRBTGT(kvno) \
  40         ((uint16_t)(((uint32_t)kvno) >> 16))
  41
  42 #define SAMBA_KVNO_AND_KRBTGT(kvno, krbtgt) \
  43         ((krb5_kvno)((((uint32_t)kvno) & 0xFFFF) | \
  44          ((((uint32_t)krbtgt) << 16) & 0xFFFF0000)))
  45
  46 enum samba_kdc_ent_type
  47 { SAMBA_KDC_ENT_TYPE_CLIENT, SAMBA_KDC_ENT_TYPE_SERVER,
  48   SAMBA_KDC_ENT_TYPE_KRBTGT, SAMBA_KDC_ENT_TYPE_TRUST, SAMBA_KDC_ENT_TYPE_ANY };
  49
  50 enum trust_direction {
  51         UNKNOWN = 0,
  52         INBOUND = LSA_TRUST_DIRECTION_INBOUND,
  53         OUTBOUND = LSA_TRUST_DIRECTION_OUTBOUND
  54 };
  55
  56 static const char *trust_attrs[] = {
  57         "trustPartner",
  58         "trustAuthIncoming",
  59         "trustAuthOutgoing",
  60         "whenCreated",
  61         "msDS-SupportedEncryptionTypes",
  62         "trustAttributes",
  63         "trustDirection",
  64         "trustType",
  65         NULL
  66 };
  67
  68
  69 static time_t ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, time_t default_val)
  70 {
  71     const char *tmp;
  72     const char *gentime;
  73     struct tm tm;
  74
  75     gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
  76     if (!gentime)
  77         return default_val;
  78
  79     tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
  80     if (tmp == NULL) {
  81             return default_val;
  82     }
  83
  84     return timegm(&tm);
  85 }
  86
  87 static HDBFlags uf2HDBFlags(krb5_context context, uint32_t userAccountControl, enum samba_kdc_ent_type ent_type)
  88 {
  89         HDBFlags flags = int2HDBFlags(0);
  90
  91         /* we don't allow kadmin deletes */
  92         flags.immutable = 1;
  93
  94         /* mark the principal as invalid to start with */
  95         flags.invalid = 1;
  96
  97         flags.renewable = 1;
  98
  99         /* All accounts are servers, but this may be disabled again in the caller */
 100         flags.server = 1;
 101
 102         /* Account types - clear the invalid bit if it turns out to be valid */
 103         if (userAccountControl & UF_NORMAL_ACCOUNT) {
 104                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
 105                         flags.client = 1;
 106                 }
 107                 flags.invalid = 0;
 108         }
 109
 110         if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
 111                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
 112                         flags.client = 1;
 113                 }
 114                 flags.invalid = 0;
 115         }
 116         if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
 117                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
 118                         flags.client = 1;
 119                 }
 120                 flags.invalid = 0;
 121         }
 122         if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
 123                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
 124                         flags.client = 1;
 125                 }
 126                 flags.invalid = 0;
 127         }
 128
 129         /* Not permitted to act as a client if disabled */
 130         if (userAccountControl & UF_ACCOUNTDISABLE) {
 131                 flags.client = 0;
 132         }
 133         if (userAccountControl & UF_LOCKOUT) {
 134                 flags.locked_out = 1;
 135         }
 136 /*
 137         if (userAccountControl & UF_PASSWORD_NOTREQD) {
 138                 flags.invalid = 1;
 139         }
 140 */
 141 /*
 142         UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
 143 */
 144         if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
 145                 flags.invalid = 1;
 146         }
 147
 148 /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in samba_kdc_message2entry() */
 149
 150 /*
 151         if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
 152                 flags.invalid = 1;
 153         }
 154 */
 155         if (userAccountControl & UF_SMARTCARD_REQUIRED) {
 156                 flags.require_hwauth = 1;
 157         }
 158         if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
 159                 flags.ok_as_delegate = 1;
 160         }
 161         if (userAccountControl & UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION) {
 162                 /*
 163                  * this is confusing...
 164                  *
 165                  * UF_TRUSTED_FOR_DELEGATION
 166                  * => ok_as_delegate
 167                  *
 168                  * and
 169                  *
 170                  * UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION
 171                  * => trusted_for_delegation
 172                  */
 173                 flags.trusted_for_delegation = 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 samba_kdc_entry_destructor(struct samba_kdc_entry *p)
 190 {
 191         if (p->entry_ex != NULL) {
 192                 hdb_entry_ex *entry_ex = p->entry_ex;
 193                 free_hdb_entry(&entry_ex->entry);
 194         }
 195
 196         return 0;
 197 }
 198
 199 static void samba_kdc_free_entry(krb5_context context, hdb_entry_ex *entry_ex)
 200 {
 201         /* this function is called only from hdb_free_entry().
 202          * Make sure we neutralize the destructor or we will
 203          * get a double free later when hdb_free_entry() will
 204          * try to call free_hdb_entry() */
 205         talloc_set_destructor(entry_ex->ctx, NULL);
 206
 207         /* now proceed to free the talloc part */
 208         talloc_free(entry_ex->ctx);
 209 }
 210
 211 static krb5_error_code samba_kdc_message2entry_keys(krb5_context context,
 212                                                     struct samba_kdc_db_context *kdc_db_ctx,
 213                                                     TALLOC_CTX *mem_ctx,
 214                                                     struct ldb_message *msg,
 215                                                     uint32_t rid,
 216                                                     bool is_rodc,
 217                                                     uint32_t userAccountControl,
 218                                                     enum samba_kdc_ent_type ent_type,
 219                                                     hdb_entry_ex *entry_ex)
 220 {
 221         krb5_error_code ret = 0;
 222         enum ndr_err_code ndr_err;
 223         struct samr_Password *hash;
 224         const struct ldb_val *sc_val;
 225         struct supplementalCredentialsBlob scb;
 226         struct supplementalCredentialsPackage *scpk = NULL;
 227         bool newer_keys = false;
 228         struct package_PrimaryKerberosBlob _pkb;
 229         struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
 230         struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
 231         uint16_t i;
 232         uint16_t allocated_keys = 0;
 233         int rodc_krbtgt_number = 0;
 234         int kvno = 0;
 235         uint32_t supported_enctypes
 236                 = ldb_msg_find_attr_as_uint(msg,
 237                                             "msDS-SupportedEncryptionTypes",
 238                                             0);
 239
 240         if (rid == DOMAIN_RID_KRBTGT || is_rodc) {
 241                 /* KDCs (and KDCs on RODCs) use AES */
 242                 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
 243         } else if (userAccountControl & (UF_PARTIAL_SECRETS_ACCOUNT|UF_SERVER_TRUST_ACCOUNT)) {
 244                 /* DCs and RODCs comptuer accounts use AES */
 245                 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
 246         } else if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT ||
 247                    (ent_type == SAMBA_KDC_ENT_TYPE_ANY)) {
 248                 /* for AS-REQ the client chooses the enc types it
 249                  * supports, and this will vary between computers a
 250                  * user logs in from.
 251                  *
 252                  * likewise for 'any' return as much as is supported,
 253                  * to export into a keytab */
 254                 supported_enctypes = ENC_ALL_TYPES;
 255         }
 256
 257         /* If UF_USE_DES_KEY_ONLY has been set, then don't allow use of the newer enc types */
 258         if (userAccountControl & UF_USE_DES_KEY_ONLY) {
 259                 supported_enctypes = ENC_CRC32|ENC_RSA_MD5;
 260         } else {
 261                 /* Otherwise, add in the default enc types */
 262                 supported_enctypes |= ENC_CRC32 | ENC_RSA_MD5 | ENC_RC4_HMAC_MD5;
 263         }
 264
 265         /* Is this the krbtgt or a RODC krbtgt */
 266         if (is_rodc) {
 267                 rodc_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
 268
 269                 if (rodc_krbtgt_number == -1) {
 270                         return EINVAL;
 271                 }
 272         }
 273
 274         entry_ex->entry.keys.val = NULL;
 275         entry_ex->entry.keys.len = 0;
 276
 277         kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
 278         if (is_rodc) {
 279                 kvno = SAMBA_KVNO_AND_KRBTGT(kvno, rodc_krbtgt_number);
 280         }
 281         entry_ex->entry.kvno = kvno;
 282
 283         /* Get keys from the db */
 284
 285         hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
 286         sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
 287
 288         /* unicodePwd for enctype 0x17 (23) if present */
 289         if (hash) {
 290                 allocated_keys++;
 291         }
 292
 293         /* supplementalCredentials if present */
 294         if (sc_val) {
 295                 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, &scb,
 296                                                    (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
 297                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 298                         dump_data(0, sc_val->data, sc_val->length);
 299                         ret = EINVAL;
 300                         goto out;
 301                 }
 302
 303                 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
 304                         NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
 305                         ret = EINVAL;
 306                         goto out;
 307                 }
 308
 309                 for (i=0; i < scb.sub.num_packages; i++) {
 310                         if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
 311                                 scpk = &scb.sub.packages[i];
 312                                 if (!scpk->data || !scpk->data[0]) {
 313                                         scpk = NULL;
 314                                         continue;
 315                                 }
 316                                 newer_keys = true;
 317                                 break;
 318                         } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
 319                                 scpk = &scb.sub.packages[i];
 320                                 if (!scpk->data || !scpk->data[0]) {
 321                                         scpk = NULL;
 322                                 }
 323                                 /*
 324                                  * we don't break here in hope to find
 325                                  * a Kerberos-Newer-Keys package
 326                                  */
 327                         }
 328                 }
 329         }
 330         /*
 331          * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
 332          * of supplementalCredentials
 333          */
 334         if (scpk) {
 335                 DATA_BLOB blob;
 336
 337                 blob = strhex_to_data_blob(mem_ctx, scpk->data);
 338                 if (!blob.data) {
 339                         ret = ENOMEM;
 340                         goto out;
 341                 }
 342
 343                 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
 344                 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &_pkb,
 345                                                (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
 346                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 347                         ret = EINVAL;
 348                         krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 349                         krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 350                         goto out;
 351                 }
 352
 353                 if (newer_keys && _pkb.version != 4) {
 354                         ret = EINVAL;
 355                         krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 356                         krb5_warnx(context, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 357                         goto out;
 358                 }
 359
 360                 if (!newer_keys && _pkb.version != 3) {
 361                         ret = EINVAL;
 362                         krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
 363                         krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
 364                         goto out;
 365                 }
 366
 367                 if (_pkb.version == 4) {
 368                         pkb4 = &_pkb.ctr.ctr4;
 369                         allocated_keys += pkb4->num_keys;
 370                 } else if (_pkb.version == 3) {
 371                         pkb3 = &_pkb.ctr.ctr3;
 372                         allocated_keys += pkb3->num_keys;
 373                 }
 374         }
 375
 376         if (allocated_keys == 0) {
 377                 if (kdc_db_ctx->rodc) {
 378                         /* We are on an RODC, but don't have keys for this account.  Signal this to the caller */
 379                         /* TODO:  We need to call a generalised version of auth_sam_trigger_repl_secret from here */
 380                         return HDB_ERR_NOT_FOUND_HERE;
 381                 }
 382
 383                 /* oh, no password.  Apparently (comment in
 384                  * hdb-ldap.c) this violates the ASN.1, but this
 385                  * allows an entry with no keys (yet). */
 386                 return 0;
 387         }
 388
 389         /* allocate space to decode into */
 390         entry_ex->entry.keys.len = 0;
 391         entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(Key));
 392         if (entry_ex->entry.keys.val == NULL) {
 393                 ret = ENOMEM;
 394                 goto out;
 395         }
 396
 397         if (hash && (supported_enctypes & ENC_RC4_HMAC_MD5)) {
 398                 Key key;
 399
 400                 key.mkvno = 0;
 401                 key.salt = NULL; /* No salt for this enc type */
 402
 403                 ret = smb_krb5_keyblock_init_contents(context,
 404                                                       ENCTYPE_ARCFOUR_HMAC,
 405                                                       hash->hash,
 406                                                       sizeof(hash->hash),
 407                                                       &key.key);
 408                 if (ret) {
 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
 416         if (pkb4) {
 417                 for (i=0; i < pkb4->num_keys; i++) {
 418                         Key key;
 419
 420                         if (!pkb4->keys[i].value) continue;
 421
 422                         if (!(kerberos_enctype_to_bitmap(pkb4->keys[i].keytype) & supported_enctypes)) {
 423                                 continue;
 424                         }
 425
 426                         key.mkvno = 0;
 427                         key.salt = NULL;
 428
 429                         if (pkb4->salt.string) {
 430                                 DATA_BLOB salt;
 431
 432                                 salt = data_blob_string_const(pkb4->salt.string);
 433
 434                                 key.salt = calloc(1, sizeof(*key.salt));
 435                                 if (key.salt == NULL) {
 436                                         ret = ENOMEM;
 437                                         goto out;
 438                                 }
 439
 440                                 key.salt->type = KRB5_PW_SALT;
 441
 442                                 ret = krb5_copy_data_contents(&key.salt->salt,
 443                                                               salt.data,
 444                                                               salt.length);
 445                                 if (ret) {
 446                                         free(key.salt);
 447                                         key.salt = NULL;
 448                                         goto out;
 449                                 }
 450                         }
 451
 452                         /* TODO: maybe pass the iteration_count somehow... */
 453
 454                         ret = smb_krb5_keyblock_init_contents(context,
 455                                                               pkb4->keys[i].keytype,
 456                                                               pkb4->keys[i].value->data,
 457                                                               pkb4->keys[i].value->length,
 458                                                               &key.key);
 459                         if (ret == KRB5_PROG_ETYPE_NOSUPP) {
 460                                 DEBUG(2,("Unsupported keytype ignored - type %u\n",
 461                                          pkb4->keys[i].keytype));
 462                                 ret = 0;
 463                                 continue;
 464                         }
 465                         if (ret) {
 466                                 if (key.salt) {
 467                                         free_Salt(key.salt);
 468                                         free(key.salt);
 469                                         key.salt = NULL;
 470                                 }
 471                                 goto out;
 472                         }
 473
 474                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 475                         entry_ex->entry.keys.len++;
 476                 }
 477         } else if (pkb3) {
 478                 for (i=0; i < pkb3->num_keys; i++) {
 479                         Key key;
 480
 481                         if (!pkb3->keys[i].value) continue;
 482
 483                         if (!(kerberos_enctype_to_bitmap(pkb3->keys[i].keytype) & supported_enctypes)) {
 484                                 continue;
 485                         }
 486
 487                         key.mkvno = 0;
 488                         key.salt = NULL;
 489
 490                         if (pkb3->salt.string) {
 491                                 DATA_BLOB salt;
 492
 493                                 salt = data_blob_string_const(pkb3->salt.string);
 494
 495                                 key.salt = calloc(1, sizeof(*key.salt));
 496                                 if (key.salt == NULL) {
 497                                         ret = ENOMEM;
 498                                         goto out;
 499                                 }
 500
 501                                 key.salt->type = KRB5_PW_SALT;
 502
 503                                 ret = krb5_copy_data_contents(&key.salt->salt,
 504                                                               salt.data,
 505                                                               salt.length);
 506                                 if (ret) {
 507                                         free(key.salt);
 508                                         key.salt = NULL;
 509                                         goto out;
 510                                 }
 511                         }
 512
 513                         ret = smb_krb5_keyblock_init_contents(context,
 514                                                               pkb3->keys[i].keytype,
 515                                                               pkb3->keys[i].value->data,
 516                                                               pkb3->keys[i].value->length,
 517                                                               &key.key);
 518                         if (ret) {
 519                                 if (key.salt) {
 520                                         free_Salt(key.salt);
 521                                         free(key.salt);
 522                                         key.salt = NULL;
 523                                 }
 524                                 goto out;
 525                         }
 526
 527                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 528                         entry_ex->entry.keys.len++;
 529                 }
 530         }
 531
 532 out:
 533         if (ret != 0) {
 534                 entry_ex->entry.keys.len = 0;
 535         }
 536         if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
 537                 free(entry_ex->entry.keys.val);
 538                 entry_ex->entry.keys.val = NULL;
 539         }
 540         return ret;
 541 }
 542
 543 /*
 544  * Construct an hdb_entry from a directory entry.
 545  */
 546 static krb5_error_code samba_kdc_message2entry(krb5_context context,
 547                                                struct samba_kdc_db_context *kdc_db_ctx,
 548                                                TALLOC_CTX *mem_ctx,
 549                                                krb5_const_principal principal,
 550                                                enum samba_kdc_ent_type ent_type,
 551                                                unsigned flags,
 552                                                struct ldb_dn *realm_dn,
 553                                                struct ldb_message *msg,
 554                                                hdb_entry_ex *entry_ex)
 555 {
 556         struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
 557         uint32_t userAccountControl;
 558         uint32_t msDS_User_Account_Control_Computed;
 559         unsigned int i;
 560         krb5_error_code ret = 0;
 561         krb5_boolean is_computer = FALSE;
 562
 563         struct samba_kdc_entry *p;
 564         NTTIME acct_expiry;
 565         NTSTATUS status;
 566
 567         uint32_t rid;
 568         bool is_rodc = false;
 569         struct ldb_message_element *objectclasses;
 570         struct ldb_val computer_val;
 571         const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
 572         computer_val.data = discard_const_p(uint8_t,"computer");
 573         computer_val.length = strlen((const char *)computer_val.data);
 574
 575         if (ldb_msg_find_element(msg, "msDS-SecondaryKrbTgtNumber")) {
 576                 is_rodc = true;
 577         }
 578
 579         if (!samAccountName) {
 580                 ret = ENOENT;
 581                 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no samAccountName present");
 582                 goto out;
 583         }
 584
 585         objectclasses = ldb_msg_find_element(msg, "objectClass");
 586
 587         if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
 588                 is_computer = TRUE;
 589         }
 590
 591         ZERO_STRUCTP(entry_ex);
 592
 593         p = talloc_zero(mem_ctx, struct samba_kdc_entry);
 594         if (!p) {
 595                 ret = ENOMEM;
 596                 goto out;
 597         }
 598
 599         p->kdc_db_ctx = kdc_db_ctx;
 600         p->entry_ex = entry_ex;
 601         p->realm_dn = talloc_reference(p, realm_dn);
 602         if (!p->realm_dn) {
 603                 ret = ENOMEM;
 604                 goto out;
 605         }
 606
 607         talloc_set_destructor(p, samba_kdc_entry_destructor);
 608
 609         /* make sure we do not have bogus data in there */
 610         memset(&entry_ex->entry, 0, sizeof(hdb_entry));
 611
 612         entry_ex->ctx = p;
 613         entry_ex->free_entry = samba_kdc_free_entry;
 614
 615         userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
 616
 617         msDS_User_Account_Control_Computed
 618                 = ldb_msg_find_attr_as_uint(msg,
 619                                             "msDS-User-Account-Control-Computed",
 620                                             UF_ACCOUNTDISABLE);
 621
 622         /*
 623          * This brings in the lockout flag, block the account if not
 624          * found.  We need the weird UF_ACCOUNTDISABLE check because
 625          * we do not want to fail open if the value is not returned,
 626          * but 0 is a valid value (all OK)
 627          */
 628         if (msDS_User_Account_Control_Computed == UF_ACCOUNTDISABLE) {
 629                 ret = EINVAL;
 630                 krb5_set_error_message(context, ret, "samba_kdc_message2entry: "
 631                                 "no msDS-User-Account-Control-Computed present");
 632                 goto out;
 633         } else {
 634                 userAccountControl |= msDS_User_Account_Control_Computed;
 635         }
 636
 637         /*
 638          * If we are set to canonicalize, we get back the fixed UPPER
 639          * case realm, and the real username (ie matching LDAP
 640          * samAccountName)
 641          *
 642          * Otherwise, if we are set to enterprise, we
 643          * get back the whole principal as-sent
 644          *
 645          * Finally, if we are not set to canonicalize, we get back the
 646          * fixed UPPER case realm, but the as-sent username
 647          */
 648
 649         if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT) {
 650                 if (flags & (HDB_F_CANON)) {
 651                         /*
 652                          * When requested to do so, ensure that the
 653                          * both realm values in the principal are set
 654                          * to the upper case, canonical realm
 655                          */
 656                         ret = smb_krb5_make_principal(context, &entry_ex->entry.principal,
 657                                                       lpcfg_realm(lp_ctx), "krbtgt",
 658                                                       lpcfg_realm(lp_ctx), NULL);
 659                         if (ret) {
 660                                 krb5_clear_error_message(context);
 661                                 goto out;
 662                         }
 663                         krb5_principal_set_type(context, entry_ex->entry.principal, KRB5_NT_SRV_INST);
 664                 } else {
 665                         ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
 666                         if (ret) {
 667                                 krb5_clear_error_message(context);
 668                                 goto out;
 669                         }
 670                         /*
 671                          * this appears to be required regardless of
 672                          * the canonicalize flag from the client
 673                          */
 674                         ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
 675                         if (ret) {
 676                                 krb5_clear_error_message(context);
 677                                 goto out;
 678                         }
 679                 }
 680
 681         } else if (ent_type == SAMBA_KDC_ENT_TYPE_ANY && principal == NULL) {
 682                 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
 683                 if (ret) {
 684                         krb5_clear_error_message(context);
 685                         goto out;
 686                 }
 687         } else if (flags & HDB_F_CANON && flags & HDB_F_FOR_AS_REQ) {
 688                 /*
 689                  * HDB_F_CANON maps from the canonicalize flag in the
 690                  * packet, and has a different meaning between AS-REQ
 691                  * and TGS-REQ.  We only change the principal in the AS-REQ case
 692                  */
 693                 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
 694                 if (ret) {
 695                         krb5_clear_error_message(context);
 696                         goto out;
 697                 }
 698         } else {
 699                 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
 700                 if (ret) {
 701                         krb5_clear_error_message(context);
 702                         goto out;
 703                 }
 704
 705                 if (smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL) {
 706                         /* While we have copied the client principal, tests
 707                          * show that Win2k3 returns the 'corrected' realm, not
 708                          * the client-specified realm.  This code attempts to
 709                          * replace the client principal's realm with the one
 710                          * we determine from our records */
 711
 712                         /* this has to be with malloc() */
 713                         ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
 714                         if (ret) {
 715                                 krb5_clear_error_message(context);
 716                                 goto out;
 717                         }
 718                 }
 719         }
 720
 721         /* First try and figure out the flags based on the userAccountControl */
 722         entry_ex->entry.flags = uf2HDBFlags(context, userAccountControl, ent_type);
 723
 724         /* Windows 2008 seems to enforce this (very sensible) rule by
 725          * default - don't allow offline attacks on a user's password
 726          * by asking for a ticket to them as a service (encrypted with
 727          * their probably patheticly insecure password) */
 728
 729         if (entry_ex->entry.flags.server
 730             && lpcfg_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
 731                 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
 732                         entry_ex->entry.flags.server = 0;
 733                 }
 734         }
 735         /*
 736          * To give the correct type of error to the client, we must
 737          * not just return the entry without .server set, we must
 738          * pretend the principal does not exist.  Otherwise we may
 739          * return ERR_POLICY instead of
 740          * KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
 741          */
 742         if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER && entry_ex->entry.flags.server == 0) {
 743                 ret = HDB_ERR_NOENTRY;
 744                 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no servicePrincipalName present for this server, refusing with no-such-entry");
 745                 goto out;
 746         }
 747         if (flags & HDB_F_ADMIN_DATA) {
 748                 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
 749                  * of the Heimdal KDC.  They are stored in a the traditional
 750                  * DB for audit purposes, and still form part of the structure
 751                  * we must return */
 752
 753                 /* use 'whenCreated' */
 754                 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 755                 /* use 'kadmin' for now (needed by mit_samba) */
 756
 757                 ret = smb_krb5_make_principal(context,
 758                                               &entry_ex->entry.created_by.principal,
 759                                               lpcfg_realm(lp_ctx), "kadmin", NULL);
 760                 if (ret) {
 761                         krb5_clear_error_message(context);
 762                         goto out;
 763                 }
 764
 765                 entry_ex->entry.modified_by = (Event *) malloc(sizeof(Event));
 766                 if (entry_ex->entry.modified_by == NULL) {
 767                         ret = ENOMEM;
 768                         krb5_set_error_message(context, ret, "malloc: out of memory");
 769                         goto out;
 770                 }
 771
 772                 /* use 'whenChanged' */
 773                 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
 774                 /* use 'kadmin' for now (needed by mit_samba) */
 775                 ret = smb_krb5_make_principal(context,
 776                                               &entry_ex->entry.modified_by->principal,
 777                                               lpcfg_realm(lp_ctx), "kadmin", NULL);
 778                 if (ret) {
 779                         krb5_clear_error_message(context);
 780                         goto out;
 781                 }
 782         }
 783
 784
 785         /* The lack of password controls etc applies to krbtgt by
 786          * virtue of being that particular RID */
 787         status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
 788
 789         if (!NT_STATUS_IS_OK(status)) {
 790                 ret = EINVAL;
 791                 goto out;
 792         }
 793
 794         if (rid == DOMAIN_RID_KRBTGT) {
 795                 char *realm = NULL;
 796
 797                 entry_ex->entry.valid_end = NULL;
 798                 entry_ex->entry.pw_end = NULL;
 799
 800                 entry_ex->entry.flags.invalid = 0;
 801                 entry_ex->entry.flags.server = 1;
 802
 803                 realm = smb_krb5_principal_get_realm(context, principal);
 804                 if (realm == NULL) {
 805                         ret = ENOMEM;
 806                         goto out;
 807                 }
 808
 809                 /* Don't mark all requests for the krbtgt/realm as
 810                  * 'change password', as otherwise we could get into
 811                  * trouble, and not enforce the password expirty.
 812                  * Instead, only do it when request is for the kpasswd service */
 813                 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER
 814                     && krb5_princ_size(context, principal) == 2
 815                     && (strcmp(krb5_principal_get_comp_string(context, principal, 0), "kadmin") == 0)
 816                     && (strcmp(krb5_principal_get_comp_string(context, principal, 1), "changepw") == 0)
 817                     && lpcfg_is_my_domain_or_realm(lp_ctx, realm)) {
 818                         entry_ex->entry.flags.change_pw = 1;
 819                 }
 820
 821                 SAFE_FREE(realm);
 822
 823                 entry_ex->entry.flags.client = 0;
 824                 entry_ex->entry.flags.forwardable = 1;
 825                 entry_ex->entry.flags.ok_as_delegate = 1;
 826         } else if (is_rodc) {
 827                 /* The RODC krbtgt account is like the main krbtgt,
 828                  * but it does not have a changepw or kadmin
 829                  * service */
 830
 831                 entry_ex->entry.valid_end = NULL;
 832                 entry_ex->entry.pw_end = NULL;
 833
 834                 /* Also don't allow the RODC krbtgt to be a client (it should not be needed) */
 835                 entry_ex->entry.flags.client = 0;
 836                 entry_ex->entry.flags.invalid = 0;
 837                 entry_ex->entry.flags.server = 1;
 838
 839                 entry_ex->entry.flags.client = 0;
 840                 entry_ex->entry.flags.forwardable = 1;
 841                 entry_ex->entry.flags.ok_as_delegate = 0;
 842         } else if (entry_ex->entry.flags.server && ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
 843                 /* The account/password expiry only applies when the account is used as a
 844                  * client (ie password login), not when used as a server */
 845
 846                 /* Make very well sure we don't use this for a client,
 847                  * it could bypass the password restrictions */
 848                 entry_ex->entry.flags.client = 0;
 849
 850                 entry_ex->entry.valid_end = NULL;
 851                 entry_ex->entry.pw_end = NULL;
 852
 853         } else {
 854                 NTTIME must_change_time
 855                         = samdb_result_force_password_change(kdc_db_ctx->samdb, mem_ctx,
 856                                                              realm_dn, msg);
 857                 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
 858                         entry_ex->entry.pw_end = NULL;
 859                 } else {
 860                         entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
 861                         if (entry_ex->entry.pw_end == NULL) {
 862                                 ret = ENOMEM;
 863                                 goto out;
 864                         }
 865                         *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
 866                 }
 867
 868                 acct_expiry = samdb_result_account_expires(msg);
 869                 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
 870                         entry_ex->entry.valid_end = NULL;
 871                 } else {
 872                         entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
 873                         if (entry_ex->entry.valid_end == NULL) {
 874                                 ret = ENOMEM;
 875                                 goto out;
 876                         }
 877                         *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
 878                 }
 879         }
 880
 881         entry_ex->entry.valid_start = NULL;
 882
 883         entry_ex->entry.max_life = malloc(sizeof(*entry_ex->entry.max_life));
 884         if (entry_ex->entry.max_life == NULL) {
 885                 ret = ENOMEM;
 886                 goto out;
 887         }
 888
 889         if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
 890                 *entry_ex->entry.max_life = kdc_db_ctx->policy.svc_tkt_lifetime;
 891         } else if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT || ent_type == SAMBA_KDC_ENT_TYPE_CLIENT) {
 892                 *entry_ex->entry.max_life = kdc_db_ctx->policy.usr_tkt_lifetime;
 893         } else {
 894                 *entry_ex->entry.max_life = MIN(kdc_db_ctx->policy.svc_tkt_lifetime,
 895                                                 kdc_db_ctx->policy.usr_tkt_lifetime);
 896         }
 897
 898         entry_ex->entry.max_renew = malloc(sizeof(*entry_ex->entry.max_life));
 899         if (entry_ex->entry.max_renew == NULL) {
 900                 ret = ENOMEM;
 901                 goto out;
 902         }
 903
 904         *entry_ex->entry.max_renew = kdc_db_ctx->policy.renewal_lifetime;
 905
 906         /* Get keys from the db */
 907         ret = samba_kdc_message2entry_keys(context, kdc_db_ctx, p, msg,
 908                                            rid, is_rodc, userAccountControl,
 909                                            ent_type, entry_ex);
 910         if (ret) {
 911                 /* Could be bougus data in the entry, or out of memory */
 912                 goto out;
 913         }
 914
 915         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 916         if (entry_ex->entry.etypes == NULL) {
 917                 krb5_clear_error_message(context);
 918                 ret = ENOMEM;
 919                 goto out;
 920         }
 921         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 922         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 923         if (entry_ex->entry.etypes->val == NULL) {
 924                 krb5_clear_error_message(context);
 925                 ret = ENOMEM;
 926                 goto out;
 927         }
 928         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 929                 entry_ex->entry.etypes->val[i] = KRB5_KEY_TYPE(&entry_ex->entry.keys.val[i].key);
 930         }
 931
 932
 933         p->msg = talloc_steal(p, msg);
 934
 935 out:
 936         if (ret != 0) {
 937                 /* This doesn't free ent itself, that is for the eventual caller to do */
 938                 hdb_free_entry(context, entry_ex);
 939                 ZERO_STRUCTP(entry_ex);
 940         } else {
 941                 talloc_steal(kdc_db_ctx, entry_ex->ctx);
 942         }
 943
 944         return ret;
 945 }
 946
 947 /*
 948  * Construct an hdb_entry from a directory entry.
 949  * The kvno is what the remote client asked for
 950  */
 951 static krb5_error_code samba_kdc_trust_message2entry(krb5_context context,
 952                                                struct samba_kdc_db_context *kdc_db_ctx,
 953                                                TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 954                                                enum trust_direction direction,
 955                                                struct ldb_dn *realm_dn,
 956                                                unsigned flags,
 957                                                uint32_t kvno,
 958                                                struct ldb_message *msg,
 959                                                hdb_entry_ex *entry_ex)
 960 {
 961         struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
 962         const char *dnsdomain;
 963         const char *realm = lpcfg_realm(lp_ctx);
 964         DATA_BLOB password_utf16 = data_blob_null;
 965         DATA_BLOB password_utf8 = data_blob_null;
 966         struct samr_Password _password_hash;
 967         const struct samr_Password *password_hash = NULL;
 968         const struct ldb_val *password_val;
 969         struct trustAuthInOutBlob password_blob;
 970         struct samba_kdc_entry *p;
 971         bool use_previous;
 972         uint32_t current_kvno;
 973         uint32_t num_keys = 0;
 974         enum ndr_err_code ndr_err;
 975         int ret, trust_direction_flags;
 976         unsigned int i;
 977         struct AuthenticationInformationArray *auth_array;
 978         uint32_t supported_enctypes = ENC_RC4_HMAC_MD5;
 979
 980         if (dsdb_functional_level(kdc_db_ctx->samdb) >= DS_DOMAIN_FUNCTION_2008) {
 981                 supported_enctypes = ldb_msg_find_attr_as_uint(msg,
 982                                         "msDS-SupportedEncryptionTypes",
 983                                         supported_enctypes);
 984         }
 985
 986         trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
 987
 988         if (direction == INBOUND) {
 989                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
 990
 991         } else { /* OUTBOUND */
 992                 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
 993                 /* replace realm */
 994                 realm = strupper_talloc(mem_ctx, dnsdomain);
 995                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
 996         }
 997
 998         if (!password_val || !(trust_direction_flags & direction)) {
 999                 krb5_clear_error_message(context);
1000                 ret = HDB_ERR_NOENTRY;
1001                 goto out;
1002         }
1003
1004         ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, &password_blob,
1005                                        (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
1006         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1007                 krb5_clear_error_message(context);
1008                 ret = EINVAL;
1009                 goto out;
1010         }
1011
1012         p = talloc(mem_ctx, struct samba_kdc_entry);
1013         if (!p) {
1014                 ret = ENOMEM;
1015                 goto out;
1016         }
1017
1018         p->kdc_db_ctx = kdc_db_ctx;
1019         p->entry_ex = entry_ex;
1020         p->realm_dn = realm_dn;
1021
1022         talloc_set_destructor(p, samba_kdc_entry_destructor);
1023
1024         /* make sure we do not have bogus data in there */
1025         memset(&entry_ex->entry, 0, sizeof(hdb_entry));
1026
1027         entry_ex->ctx = p;
1028         entry_ex->free_entry = samba_kdc_free_entry;
1029
1030         /* use 'whenCreated' */
1031         entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
1032         /* use 'kadmin' for now (needed by mit_samba) */
1033         ret = smb_krb5_make_principal(context,
1034                                       &entry_ex->entry.created_by.principal,
1035                                       realm, "kadmin", NULL);
1036         if (ret) {
1037                 krb5_clear_error_message(context);
1038                 goto out;
1039         }
1040
1041         ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
1042         if (ret) {
1043                 krb5_clear_error_message(context);
1044                 goto out;
1045         }
1046
1047         /*
1048          * While we have copied the client principal, tests
1049          * show that Win2k3 returns the 'corrected' realm, not
1050          * the client-specified realm.  This code attempts to
1051          * replace the client principal's realm with the one
1052          * we determine from our records
1053          */
1054
1055         ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, realm);
1056         if (ret) {
1057                 krb5_clear_error_message(context);
1058                 goto out;
1059         }
1060
1061         entry_ex->entry.valid_start = NULL;
1062
1063         /* we need to work out if we are going to use the current or
1064          * the previous password hash.
1065          * We base this on the kvno the client passes in. If the kvno
1066          * passed in is equal to the current kvno in our database then
1067          * we use the current structure. If it is the current kvno-1,
1068          * then we use the previous substrucure.
1069          */
1070
1071         /* first work out the current kvno */
1072         current_kvno = 0;
1073         for (i=0; i < password_blob.count; i++) {
1074                 if (password_blob.current.array[i].AuthType == TRUST_AUTH_TYPE_VERSION) {
1075                         current_kvno = password_blob.current.array[i].AuthInfo.version.version;
1076                 }
1077         }
1078
1079         /* work out whether we will use the previous or current
1080            password */
1081         if (password_blob.previous.count == 0) {
1082                 /* there is no previous password */
1083                 use_previous = false;
1084         } else if (!(flags & HDB_F_KVNO_SPECIFIED) ||
1085             kvno == current_kvno) {
1086                 use_previous = false;
1087         } else if ((kvno+1 == current_kvno) ||
1088                    (kvno == 255 && current_kvno == 0)) {
1089                 use_previous = true;
1090         } else {
1091                 DEBUG(1,(__location__ ": Request for unknown kvno %u - current kvno is %u\n",
1092                          kvno, current_kvno));
1093                 krb5_clear_error_message(context);
1094                 ret = HDB_ERR_NOENTRY;
1095                 goto out;
1096         }
1097
1098         if (use_previous) {
1099                 auth_array = &password_blob.previous;
1100         } else {
1101                 auth_array = &password_blob.current;
1102         }
1103
1104         /* use the kvno the client specified, if available */
1105         if (flags & HDB_F_KVNO_SPECIFIED) {
1106                 entry_ex->entry.kvno = kvno;
1107         } else {
1108                 entry_ex->entry.kvno = current_kvno;
1109         }
1110
1111         for (i=0; i < auth_array->count; i++) {
1112                 if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
1113                         bool ok;
1114
1115                         password_utf16 = data_blob_const(auth_array->array[i].AuthInfo.clear.password,
1116                                                          auth_array->array[i].AuthInfo.clear.size);
1117                         if (password_utf16.length == 0) {
1118                                 break;
1119                         }
1120
1121                         if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1122                                 mdfour(_password_hash.hash, password_utf16.data, password_utf16.length);
1123                                 if (password_hash == NULL) {
1124                                         num_keys += 1;
1125                                 }
1126                                 password_hash = &_password_hash;
1127                         }
1128
1129                         if (!(supported_enctypes & (ENC_HMAC_SHA1_96_AES128|ENC_HMAC_SHA1_96_AES256))) {
1130                                 break;
1131                         }
1132
1133                         ok = convert_string_talloc(mem_ctx,
1134                                                    CH_UTF16MUNGED, CH_UTF8,
1135                                                    password_utf16.data,
1136                                                    password_utf16.length,
1137                                                    (void *)&password_utf8.data,
1138                                                    &password_utf8.length);
1139                         if (!ok) {
1140                                 krb5_clear_error_message(context);
1141                                 ret = ENOMEM;
1142                                 goto out;
1143                         }
1144
1145                         if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1146                                 num_keys += 1;
1147                         }
1148                         if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1149                                 num_keys += 1;
1150                         }
1151                         break;
1152                 } else if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
1153                         if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1154                                 password_hash = &auth_array->array[i].AuthInfo.nt4owf.password;
1155                                 num_keys += 1;
1156                         }
1157                 }
1158         }
1159
1160         /* Must have found a cleartext or MD4 password */
1161         if (num_keys == 0) {
1162                 DEBUG(1,(__location__ ": no usable key found\n"));
1163                 krb5_clear_error_message(context);
1164                 ret = HDB_ERR_NOENTRY;
1165                 goto out;
1166         }
1167
1168         entry_ex->entry.keys.val = calloc(num_keys, sizeof(Key));
1169         if (entry_ex->entry.keys.val == NULL) {
1170                 krb5_clear_error_message(context);
1171                 ret = ENOMEM;
1172                 goto out;
1173         }
1174
1175         if (password_utf8.length != 0) {
1176                 Key key = {};
1177                 krb5_const_principal salt_principal = principal;
1178                 krb5_salt salt;
1179                 krb5_data cleartext_data;
1180
1181                 cleartext_data.data = password_utf8.data;
1182                 cleartext_data.length = password_utf8.length;
1183
1184                 ret = krb5_get_pw_salt(context,
1185                                        salt_principal,
1186                                        &salt);
1187                 if (ret != 0) {
1188                         goto out;
1189                 }
1190
1191                 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1192                         ret = krb5_string_to_key_data_salt(context,
1193                                                            ENCTYPE_AES256_CTS_HMAC_SHA1_96,
1194                                                            cleartext_data,
1195                                                            salt,
1196                                                            &key.key);
1197                         if (ret != 0) {
1198                                 krb5_free_salt(context, salt);
1199                                 goto out;
1200                         }
1201
1202                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1203                         entry_ex->entry.keys.len++;
1204                 }
1205
1206                 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1207                         ret = krb5_string_to_key_data_salt(context,
1208                                                            ENCTYPE_AES128_CTS_HMAC_SHA1_96,
1209                                                            cleartext_data,
1210                                                            salt,
1211                                                            &key.key);
1212                         if (ret != 0) {
1213                                 krb5_free_salt(context, salt);
1214                                 goto out;
1215                         }
1216
1217                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1218                         entry_ex->entry.keys.len++;
1219                 }
1220
1221                 krb5_free_salt(context, salt);
1222         }
1223
1224         if (password_hash != NULL) {
1225                 Key key = {};
1226
1227                 ret = smb_krb5_keyblock_init_contents(context,
1228                                                       ENCTYPE_ARCFOUR_HMAC,
1229                                                       password_hash->hash,
1230                                                       sizeof(password_hash->hash),
1231                                                       &key.key);
1232                 if (ret != 0) {
1233                         goto out;
1234                 }
1235
1236                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1237                 entry_ex->entry.keys.len++;
1238         }
1239
1240         entry_ex->entry.flags = int2HDBFlags(0);
1241         entry_ex->entry.flags.immutable = 1;
1242         entry_ex->entry.flags.invalid = 0;
1243         entry_ex->entry.flags.server = 1;
1244         entry_ex->entry.flags.require_preauth = 1;
1245
1246         entry_ex->entry.pw_end = NULL;
1247
1248         entry_ex->entry.max_life = NULL;
1249
1250         entry_ex->entry.max_renew = NULL;
1251
1252         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
1253         if (entry_ex->entry.etypes == NULL) {
1254                 krb5_clear_error_message(context);
1255                 ret = ENOMEM;
1256                 goto out;
1257         }
1258         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
1259         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
1260         if (entry_ex->entry.etypes->val == NULL) {
1261                 krb5_clear_error_message(context);
1262                 ret = ENOMEM;
1263                 goto out;
1264         }
1265         for (i=0; i < entry_ex->entry.etypes->len; i++) {
1266                 entry_ex->entry.etypes->val[i] = KRB5_KEY_TYPE(&entry_ex->entry.keys.val[i].key);
1267         }
1268
1269
1270         p->msg = talloc_steal(p, msg);
1271
1272 out:
1273         if (ret != 0) {
1274                 /* This doesn't free ent itself, that is for the eventual caller to do */
1275                 hdb_free_entry(context, entry_ex);
1276         } else {
1277                 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1278         }
1279
1280         return ret;
1281
1282 }
1283
1284 static krb5_error_code samba_kdc_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
1285                                         TALLOC_CTX *mem_ctx,
1286                                         const char *realm,
1287                                         struct ldb_dn *realm_dn,
1288                                         struct ldb_message **pmsg)
1289 {
1290         NTSTATUS status;
1291         const char * const *attrs = trust_attrs;
1292
1293         status = sam_get_results_trust(ldb_ctx,
1294                                        mem_ctx, realm, realm, attrs,
1295                                        pmsg);
1296         if (NT_STATUS_IS_OK(status)) {
1297                 return 0;
1298         } else if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
1299                 return HDB_ERR_NOENTRY;
1300         } else if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1301                 int ret = ENOMEM;
1302                 krb5_set_error_message(context, ret, "get_sam_result_trust: out of memory");
1303                 return ret;
1304         } else {
1305                 int ret = EINVAL;
1306                 krb5_set_error_message(context, ret, "get_sam_result_trust: %s", nt_errstr(status));
1307                 return ret;
1308         }
1309 }
1310
1311 static krb5_error_code samba_kdc_lookup_client(krb5_context context,
1312                                                 struct samba_kdc_db_context *kdc_db_ctx,
1313                                                 TALLOC_CTX *mem_ctx,
1314                                                 krb5_const_principal principal,
1315                                                 const char **attrs,
1316                                                 struct ldb_dn **realm_dn,
1317                                                 struct ldb_message **msg) {
1318         NTSTATUS nt_status;
1319         char *principal_string;
1320
1321         if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1322                 principal_string = smb_krb5_principal_get_comp_string(mem_ctx, context,
1323                                                                       principal, 0);
1324                 if (principal_string == NULL) {
1325                         return ENOMEM;
1326                 }
1327                 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1328                                                       mem_ctx, principal_string, attrs,
1329                                                       realm_dn, msg);
1330                 TALLOC_FREE(principal_string);
1331         } else {
1332                 krb5_error_code ret;
1333                 ret = krb5_unparse_name(context, principal, &principal_string);
1334                 if (ret != 0) {
1335                         return ret;
1336                 }
1337                 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1338                                                       mem_ctx, principal_string, attrs,
1339                                                       realm_dn, msg);
1340                 free(principal_string);
1341         }
1342
1343         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1344                 return HDB_ERR_NOENTRY;
1345         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1346                 return ENOMEM;
1347         } else if (!NT_STATUS_IS_OK(nt_status)) {
1348                 return EINVAL;
1349         }
1350
1351         return 0;
1352 }
1353
1354 static krb5_error_code samba_kdc_fetch_client(krb5_context context,
1355                                                struct samba_kdc_db_context *kdc_db_ctx,
1356                                                TALLOC_CTX *mem_ctx,
1357                                                krb5_const_principal principal,
1358                                                unsigned flags,
1359                                                hdb_entry_ex *entry_ex) {
1360         struct ldb_dn *realm_dn;
1361         krb5_error_code ret;
1362         struct ldb_message *msg = NULL;
1363
1364         ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1365                                       mem_ctx, principal, user_attrs,
1366                                       &realm_dn, &msg);
1367         if (ret != 0) {
1368                 return ret;
1369         }
1370
1371         ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1372                                       principal, SAMBA_KDC_ENT_TYPE_CLIENT,
1373                                       flags,
1374                                       realm_dn, msg, entry_ex);
1375         return ret;
1376 }
1377
1378 static krb5_error_code samba_kdc_fetch_krbtgt(krb5_context context,
1379                                               struct samba_kdc_db_context *kdc_db_ctx,
1380                                               TALLOC_CTX *mem_ctx,
1381                                               krb5_const_principal principal,
1382                                               unsigned flags,
1383                                               uint32_t kvno,
1384                                               hdb_entry_ex *entry_ex)
1385 {
1386         struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1387         krb5_error_code ret;
1388         struct ldb_message *msg = NULL;
1389         struct ldb_dn *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1390         char *realm_from_princ, *realm_from_princ_malloc;
1391
1392         realm_from_princ_malloc = smb_krb5_principal_get_realm(context, principal);
1393         if (realm_from_princ_malloc == NULL) {
1394                 /* can't happen */
1395                 return HDB_ERR_NOENTRY;
1396         }
1397         realm_from_princ = talloc_strdup(mem_ctx, realm_from_princ_malloc);
1398         free(realm_from_princ_malloc);
1399         if (realm_from_princ == NULL) {
1400                 return HDB_ERR_NOENTRY;
1401         }
1402
1403         if (krb5_princ_size(context, principal) != 2
1404             || (strcmp(krb5_principal_get_comp_string(context, principal, 0), KRB5_TGS_NAME) != 0)) {
1405                 /* Not a krbtgt */
1406                 return HDB_ERR_NOENTRY;
1407         }
1408
1409         /* krbtgt case.  Either us or a trusted realm */
1410
1411         if (lpcfg_is_my_domain_or_realm(lp_ctx, realm_from_princ)
1412             && lpcfg_is_my_domain_or_realm(lp_ctx, krb5_principal_get_comp_string(context, principal, 1))) {
1413                 /* us, or someone quite like us */
1414                 /* Cludge, cludge cludge.  If the realm part of krbtgt/realm,
1415                  * is in our db, then direct the caller at our primary
1416                  * krbtgt */
1417
1418                 int lret;
1419                 unsigned int krbtgt_number;
1420                 /* w2k8r2 sometimes gives us a kvno of 255 for inter-domain
1421                    trust tickets. We don't yet know what this means, but we do
1422                    seem to need to treat it as unspecified */
1423                 if (flags & HDB_F_KVNO_SPECIFIED) {
1424                         krbtgt_number = SAMBA_KVNO_GET_KRBTGT(kvno);
1425                         if (kdc_db_ctx->rodc) {
1426                                 if (krbtgt_number != kdc_db_ctx->my_krbtgt_number) {
1427                                         return HDB_ERR_NOT_FOUND_HERE;
1428                                 }
1429                         }
1430                 } else {
1431                         krbtgt_number = kdc_db_ctx->my_krbtgt_number;
1432                 }
1433
1434                 if (krbtgt_number == kdc_db_ctx->my_krbtgt_number) {
1435                         lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1436                                                &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1437                                                krbtgt_attrs, DSDB_SEARCH_NO_GLOBAL_CATALOG,
1438                                                "(objectClass=user)");
1439                 } else {
1440                         /* We need to look up an RODC krbtgt (perhaps
1441                          * ours, if we are an RODC, perhaps another
1442                          * RODC if we are a read-write DC */
1443                         lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1444                                                &msg, realm_dn, LDB_SCOPE_SUBTREE,
1445                                                krbtgt_attrs,
1446                                                DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1447                                                "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=%u))", (unsigned)(krbtgt_number));
1448                 }
1449
1450                 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1451                         krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1452                                    (unsigned)(krbtgt_number));
1453                         krb5_set_error_message(context, HDB_ERR_NOENTRY,
1454                                                "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1455                                                (unsigned)(krbtgt_number));
1456                         return HDB_ERR_NOENTRY;
1457                 } else if (lret != LDB_SUCCESS) {
1458                         krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1459                                    (unsigned)(krbtgt_number));
1460                         krb5_set_error_message(context, HDB_ERR_NOENTRY,
1461                                                "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1462                                                (unsigned)(krbtgt_number));
1463                         return HDB_ERR_NOENTRY;
1464                 }
1465
1466                 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1467                                               principal, SAMBA_KDC_ENT_TYPE_KRBTGT,
1468                                               flags, realm_dn, msg, entry_ex);
1469                 if (ret != 0) {
1470                         krb5_warnx(context, "samba_kdc_fetch: self krbtgt message2entry failed");
1471                 }
1472                 return ret;
1473
1474         } else {
1475                 enum trust_direction direction = UNKNOWN;
1476                 const char *realm = NULL;
1477
1478                 /* Either an inbound or outbound trust */
1479
1480                 if (strcasecmp(lpcfg_realm(lp_ctx), realm_from_princ) == 0) {
1481                         /* look for inbound trust */
1482                         direction = INBOUND;
1483                         realm = krb5_principal_get_comp_string(context, principal, 1);
1484                 } else if (strcasecmp(lpcfg_realm(lp_ctx), krb5_principal_get_comp_string(context, principal, 1)) == 0) {
1485                         /* look for outbound trust */
1486                         direction = OUTBOUND;
1487                         realm = realm_from_princ;
1488                 } else {
1489                         krb5_warnx(context, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1490                                    realm_from_princ,
1491                                    krb5_principal_get_comp_string(context, principal, 1));
1492                         krb5_set_error_message(context, HDB_ERR_NOENTRY, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1493                                                realm_from_princ,
1494                                                krb5_principal_get_comp_string(context, principal, 1));
1495                         return HDB_ERR_NOENTRY;
1496                 }
1497
1498                 /* Trusted domains are under CN=system */
1499
1500                 ret = samba_kdc_lookup_trust(context, kdc_db_ctx->samdb,
1501                                        mem_ctx,
1502                                        realm, realm_dn, &msg);
1503
1504                 if (ret != 0) {
1505                         krb5_warnx(context, "samba_kdc_fetch: could not find principal in DB");
1506                         krb5_set_error_message(context, ret, "samba_kdc_fetch: could not find principal in DB");
1507                         return ret;
1508                 }
1509
1510                 ret = samba_kdc_trust_message2entry(context, kdc_db_ctx, mem_ctx,
1511                                                     principal, direction,
1512                                                     realm_dn, flags, kvno, msg, entry_ex);
1513                 if (ret != 0) {
1514                         krb5_warnx(context, "samba_kdc_fetch: trust_message2entry failed for %s",
1515                                    ldb_dn_get_linearized(msg->dn));
1516                         krb5_set_error_message(context, ret, "samba_kdc_fetch: "
1517                                                "trust_message2entry failed for %s",
1518                                                ldb_dn_get_linearized(msg->dn));
1519                 }
1520                 return ret;
1521         }
1522
1523 }
1524
1525 static krb5_error_code samba_kdc_lookup_server(krb5_context context,
1526                                                struct samba_kdc_db_context *kdc_db_ctx,
1527                                                TALLOC_CTX *mem_ctx,
1528                                                krb5_const_principal principal,
1529                                                unsigned flags,
1530                                                const char **attrs,
1531                                                struct ldb_dn **realm_dn,
1532                                                struct ldb_message **msg)
1533 {
1534         krb5_error_code ret;
1535         if ((smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL)
1536             && krb5_princ_size(context, principal) >= 2) {
1537                 /* 'normal server' case */
1538                 int ldb_ret;
1539                 NTSTATUS nt_status;
1540                 struct ldb_dn *user_dn;
1541                 char *principal_string;
1542
1543                 ret = krb5_unparse_name_flags(context, principal,
1544                                               KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1545                                               &principal_string);
1546                 if (ret != 0) {
1547                         return ret;
1548                 }
1549
1550                 /* At this point we may find the host is known to be
1551                  * in a different realm, so we should generate a
1552                  * referral instead */
1553                 nt_status = crack_service_principal_name(kdc_db_ctx->samdb,
1554                                                          mem_ctx, principal_string,
1555                                                          &user_dn, realm_dn);
1556                 free(principal_string);
1557
1558                 if (!NT_STATUS_IS_OK(nt_status)) {
1559                         return HDB_ERR_NOENTRY;
1560                 }
1561
1562                 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb,
1563                                           mem_ctx,
1564                                           msg, user_dn, LDB_SCOPE_BASE,
1565                                           attrs,
1566                                           DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1567                                           "(objectClass=*)");
1568                 if (ldb_ret != LDB_SUCCESS) {
1569                         return HDB_ERR_NOENTRY;
1570                 }
1571                 return 0;
1572         } else if (!(flags & HDB_F_FOR_AS_REQ)
1573                    && smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1574                 /*
1575                  * The behaviour of accepting an
1576                  * KRB5_NT_ENTERPRISE_PRINCIPAL server principal
1577                  * containing a UPN only applies to TGS-REQ packets,
1578                  * not AS-REQ packets.
1579                  */
1580                 return samba_kdc_lookup_client(context, kdc_db_ctx,
1581                                                mem_ctx, principal, attrs,
1582                                                realm_dn, msg);
1583         } else {
1584                 /*
1585                  * This case is for:
1586                  *  - the AS-REQ, where we only accept
1587                  *    samAccountName based lookups for the server, no
1588                  *    matter if the name is an
1589                  *    KRB5_NT_ENTERPRISE_PRINCIPAL or not
1590                  *  - for the TGS-REQ when we are not given an
1591                  *    KRB5_NT_ENTERPRISE_PRINCIPAL, which also must
1592                  *    only lookup samAccountName based names.
1593                  */
1594                 int lret;
1595                 char *short_princ;
1596                 krb5_principal enterprise_prinicpal = NULL;
1597
1598                 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1599                         /* Need to reparse the enterprise principal to find the real target */
1600                         if (krb5_princ_size(context, principal) != 1) {
1601                                 ret = KRB5_PARSE_MALFORMED;
1602                                 krb5_set_error_message(context, ret, "samba_kdc_lookup_server: request for an "
1603                                                        "enterprise principal with wrong (%d) number of components",
1604                                                        krb5_princ_size(context, principal));
1605                                 return ret;
1606                         }
1607                         ret = krb5_parse_name(context,
1608                                               krb5_principal_get_comp_string(context, principal, 0),
1609                                               &enterprise_prinicpal);
1610                         if (ret) {
1611                                 return ret;
1612                         }
1613                         principal = enterprise_prinicpal;
1614                 }
1615
1616                 /* server as client principal case, but we must not lookup userPrincipalNames */
1617                 *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1618
1619                 /* TODO: Check if it is our realm, otherwise give referral */
1620
1621                 ret = krb5_unparse_name_flags(context, principal,
1622                                               KRB5_PRINCIPAL_UNPARSE_NO_REALM |
1623                                               KRB5_PRINCIPAL_UNPARSE_DISPLAY,
1624                                               &short_princ);
1625
1626                 if (ret != 0) {
1627                         krb5_set_error_message(context, ret, "samba_kdc_lookup_principal: could not parse principal");
1628                         krb5_warnx(context, "samba_kdc_lookup_principal: could not parse principal");
1629                         return ret;
1630                 }
1631
1632                 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx, msg,
1633                                        *realm_dn, LDB_SCOPE_SUBTREE,
1634                                        attrs,
1635                                        DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1636                                        "(&(objectClass=user)(samAccountName=%s))",
1637                                        ldb_binary_encode_string(mem_ctx, short_princ));
1638                 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1639                         DEBUG(3, ("Failed to find an entry for %s\n", short_princ));
1640                         free(short_princ);
1641                         return HDB_ERR_NOENTRY;
1642                 }
1643                 if (lret != LDB_SUCCESS) {
1644                         DEBUG(3, ("Failed single search for %s - %s\n",
1645                                   short_princ, ldb_errstring(kdc_db_ctx->samdb)));
1646                         free(short_princ);
1647                         return HDB_ERR_NOENTRY;
1648                 }
1649                 free(short_princ);
1650                 return 0;
1651         }
1652         return HDB_ERR_NOENTRY;
1653 }
1654
1655
1656
1657 static krb5_error_code samba_kdc_fetch_server(krb5_context context,
1658                                               struct samba_kdc_db_context *kdc_db_ctx,
1659                                               TALLOC_CTX *mem_ctx,
1660                                               krb5_const_principal principal,
1661                                               unsigned flags,
1662                                               hdb_entry_ex *entry_ex)
1663 {
1664         krb5_error_code ret;
1665         struct ldb_dn *realm_dn;
1666         struct ldb_message *msg;
1667
1668         ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, principal,
1669                                       flags, server_attrs, &realm_dn, &msg);
1670         if (ret != 0) {
1671                 return ret;
1672         }
1673
1674         ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1675                                       principal, SAMBA_KDC_ENT_TYPE_SERVER,
1676                                       flags,
1677                                       realm_dn, msg, entry_ex);
1678         if (ret != 0) {
1679                 krb5_warnx(context, "samba_kdc_fetch: message2entry failed");
1680         }
1681
1682         return ret;
1683 }
1684
1685 krb5_error_code samba_kdc_fetch(krb5_context context,
1686                                 struct samba_kdc_db_context *kdc_db_ctx,
1687                                 krb5_const_principal principal,
1688                                 unsigned flags,
1689                                 krb5_kvno kvno,
1690                                 hdb_entry_ex *entry_ex)
1691 {
1692         krb5_error_code ret = HDB_ERR_NOENTRY;
1693         TALLOC_CTX *mem_ctx;
1694
1695         mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_fetch context");
1696         if (!mem_ctx) {
1697                 ret = ENOMEM;
1698                 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1699                 return ret;
1700         }
1701
1702         if (flags & HDB_F_GET_CLIENT) {
1703                 ret = samba_kdc_fetch_client(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
1704                 if (ret != HDB_ERR_NOENTRY) goto done;
1705         }
1706         if (flags & HDB_F_GET_SERVER) {
1707                 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
1708                 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
1709                 if (ret != HDB_ERR_NOENTRY) goto done;
1710
1711                 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
1712                 ret = samba_kdc_fetch_server(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
1713                 if (ret != HDB_ERR_NOENTRY) goto done;
1714         }
1715         if (flags & HDB_F_GET_KRBTGT) {
1716                 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
1717                 if (ret != HDB_ERR_NOENTRY) goto done;
1718         }
1719
1720 done:
1721         talloc_free(mem_ctx);
1722         return ret;
1723 }
1724
1725 struct samba_kdc_seq {
1726         unsigned int index;
1727         unsigned int count;
1728         struct ldb_message **msgs;
1729         struct ldb_dn *realm_dn;
1730 };
1731
1732 static krb5_error_code samba_kdc_seq(krb5_context context,
1733                                      struct samba_kdc_db_context *kdc_db_ctx,
1734                                      hdb_entry_ex *entry)
1735 {
1736         krb5_error_code ret;
1737         struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
1738         const char *realm = lpcfg_realm(kdc_db_ctx->lp_ctx);
1739         struct ldb_message *msg = NULL;
1740         const char *sAMAccountName = NULL;
1741         krb5_principal principal = NULL;
1742         TALLOC_CTX *mem_ctx;
1743
1744         if (!priv) {
1745                 return HDB_ERR_NOENTRY;
1746         }
1747
1748         mem_ctx = talloc_named(priv, 0, "samba_kdc_seq context");
1749
1750         if (!mem_ctx) {
1751                 ret = ENOMEM;
1752                 krb5_set_error_message(context, ret, "samba_kdc_seq: talloc_named() failed!");
1753                 return ret;
1754         }
1755
1756         while (priv->index < priv->count) {
1757                 msg = priv->msgs[priv->index++];
1758
1759                 sAMAccountName = ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL);
1760                 if (sAMAccountName != NULL) {
1761                         break;
1762                 }
1763         }
1764
1765         if (sAMAccountName == NULL) {
1766                 ret = HDB_ERR_NOENTRY;
1767                 goto out;
1768         }
1769
1770         ret = smb_krb5_make_principal(context, &principal,
1771                                       realm, sAMAccountName, NULL);
1772         if (ret != 0) {
1773                 goto out;
1774         }
1775
1776         ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1777                                       principal, SAMBA_KDC_ENT_TYPE_ANY,
1778                                       HDB_F_ADMIN_DATA|HDB_F_GET_ANY,
1779                                       priv->realm_dn, msg, entry);
1780
1781 out:
1782         if (principal != NULL) {
1783                 krb5_free_principal(context, principal);
1784         }
1785
1786         if (ret != 0) {
1787                 TALLOC_FREE(priv);
1788                 kdc_db_ctx->seq_ctx = NULL;
1789         } else {
1790                 talloc_free(mem_ctx);
1791         }
1792
1793         return ret;
1794 }
1795
1796 krb5_error_code samba_kdc_firstkey(krb5_context context,
1797                                    struct samba_kdc_db_context *kdc_db_ctx,
1798                                    hdb_entry_ex *entry)
1799 {
1800         struct ldb_context *ldb_ctx = kdc_db_ctx->samdb;
1801         struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
1802         char *realm;
1803         struct ldb_result *res = NULL;
1804         krb5_error_code ret;
1805         TALLOC_CTX *mem_ctx;
1806         int lret;
1807
1808         if (priv) {
1809                 TALLOC_FREE(priv);
1810                 kdc_db_ctx->seq_ctx = NULL;
1811         }
1812
1813         priv = (struct samba_kdc_seq *) talloc(kdc_db_ctx, struct samba_kdc_seq);
1814         if (!priv) {
1815                 ret = ENOMEM;
1816                 krb5_set_error_message(context, ret, "talloc: out of memory");
1817                 return ret;
1818         }
1819
1820         priv->index = 0;
1821         priv->msgs = NULL;
1822         priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
1823         priv->count = 0;
1824
1825         mem_ctx = talloc_named(priv, 0, "samba_kdc_firstkey context");
1826
1827         if (!mem_ctx) {
1828                 ret = ENOMEM;
1829                 krb5_set_error_message(context, ret, "samba_kdc_firstkey: talloc_named() failed!");
1830                 return ret;
1831         }
1832
1833         ret = krb5_get_default_realm(context, &realm);
1834         if (ret != 0) {
1835                 TALLOC_FREE(priv);
1836                 return ret;
1837         }
1838         krb5_free_default_realm(context, realm);
1839
1840         lret = dsdb_search(ldb_ctx, priv, &res,
1841                            priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
1842                            DSDB_SEARCH_NO_GLOBAL_CATALOG,
1843                            "(objectClass=user)");
1844
1845         if (lret != LDB_SUCCESS) {
1846                 TALLOC_FREE(priv);
1847                 return HDB_ERR_NOENTRY;
1848         }
1849
1850         priv->count = res->count;
1851         priv->msgs = talloc_steal(priv, res->msgs);
1852         talloc_free(res);
1853
1854         kdc_db_ctx->seq_ctx = priv;
1855
1856         ret = samba_kdc_seq(context, kdc_db_ctx, entry);
1857
1858         if (ret != 0) {
1859                 TALLOC_FREE(priv);
1860                 kdc_db_ctx->seq_ctx = NULL;
1861         } else {
1862                 talloc_free(mem_ctx);
1863         }
1864         return ret;
1865 }
1866
1867 krb5_error_code samba_kdc_nextkey(krb5_context context,
1868                                   struct samba_kdc_db_context *kdc_db_ctx,
1869                                   hdb_entry_ex *entry)
1870 {
1871         return samba_kdc_seq(context, kdc_db_ctx, entry);
1872 }
1873
1874 /* Check if a given entry may delegate or do s4u2self to this target principal
1875  *
1876  * This is currently a very nasty hack - allowing only delegation to itself.
1877  */
1878 krb5_error_code
1879 samba_kdc_check_s4u2self(krb5_context context,
1880                          struct samba_kdc_db_context *kdc_db_ctx,
1881                          hdb_entry_ex *entry,
1882                          krb5_const_principal target_principal)
1883 {
1884         krb5_error_code ret;
1885         struct ldb_dn *realm_dn;
1886         struct ldb_message *msg;
1887         struct dom_sid *orig_sid;
1888         struct dom_sid *target_sid;
1889         struct samba_kdc_entry *p = talloc_get_type(entry->ctx, struct samba_kdc_entry);
1890         const char *delegation_check_attrs[] = {
1891                 "objectSid", NULL
1892         };
1893
1894         TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2self");
1895
1896         if (!mem_ctx) {
1897                 ret = ENOMEM;
1898                 krb5_set_error_message(context, ret, "samba_kdc_check_s4u2self: talloc_named() failed!");
1899                 return ret;
1900         }
1901
1902         ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, target_principal,
1903                                       HDB_F_GET_CLIENT|HDB_F_GET_SERVER,
1904                                       delegation_check_attrs, &realm_dn, &msg);
1905
1906         if (ret != 0) {
1907                 talloc_free(mem_ctx);
1908                 return ret;
1909         }
1910
1911         orig_sid = samdb_result_dom_sid(mem_ctx, p->msg, "objectSid");
1912         target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
1913
1914         /* Allow delegation to the same principal, even if by a different
1915          * name.  The easy and safe way to prove this is by SID
1916          * comparison */
1917         if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
1918                 talloc_free(mem_ctx);
1919                 return KRB5KDC_ERR_BADOPTION;
1920         }
1921
1922         talloc_free(mem_ctx);
1923         return ret;
1924 }
1925
1926 /* Certificates printed by a the Certificate Authority might have a
1927  * slightly different form of the user principal name to that in the
1928  * database.  Allow a mismatch where they both refer to the same
1929  * SID */
1930
1931 krb5_error_code
1932 samba_kdc_check_pkinit_ms_upn_match(krb5_context context,
1933                                     struct samba_kdc_db_context *kdc_db_ctx,
1934                                      hdb_entry_ex *entry,
1935                                      krb5_const_principal certificate_principal)
1936 {
1937         krb5_error_code ret;
1938         struct ldb_dn *realm_dn;
1939         struct ldb_message *msg;
1940         struct dom_sid *orig_sid;
1941         struct dom_sid *target_sid;
1942         struct samba_kdc_entry *p = talloc_get_type(entry->ctx, struct samba_kdc_entry);
1943         const char *ms_upn_check_attrs[] = {
1944                 "objectSid", NULL
1945         };
1946
1947         TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_pkinit_ms_upn_match");
1948
1949         if (!mem_ctx) {
1950                 ret = ENOMEM;
1951                 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1952                 return ret;
1953         }
1954
1955         ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1956                                       mem_ctx, certificate_principal,
1957                                       ms_upn_check_attrs, &realm_dn, &msg);
1958
1959         if (ret != 0) {
1960                 talloc_free(mem_ctx);
1961                 return ret;
1962         }
1963
1964         orig_sid = samdb_result_dom_sid(mem_ctx, p->msg, "objectSid");
1965         target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
1966
1967         /* Consider these to be the same principal, even if by a different
1968          * name.  The easy and safe way to prove this is by SID
1969          * comparison */
1970         if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
1971                 talloc_free(mem_ctx);
1972                 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1973         }
1974
1975         talloc_free(mem_ctx);
1976         return ret;
1977 }
1978
1979 /*
1980  * Check if a given entry may delegate to this target principal
1981  * with S4U2Proxy.
1982  */
1983 krb5_error_code
1984 samba_kdc_check_s4u2proxy(krb5_context context,
1985                           struct samba_kdc_db_context *kdc_db_ctx,
1986                           hdb_entry_ex *entry,
1987                           krb5_const_principal target_principal)
1988 {
1989         krb5_error_code ret;
1990         char *tmp = NULL;
1991         const char *client_dn = NULL;
1992         const char *target_principal_name = NULL;
1993         struct ldb_message_element *el;
1994         struct ldb_val val;
1995         unsigned int i;
1996         bool found = false;
1997         struct samba_kdc_entry *p = talloc_get_type(entry->ctx, struct samba_kdc_entry);
1998
1999         TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2proxy");
2000
2001         if (!mem_ctx) {
2002                 ret = ENOMEM;
2003                 krb5_set_error_message(context, ret,
2004                                        "samba_kdc_check_s4u2proxy:"
2005                                        " talloc_named() failed!");
2006                 return ret;
2007         }
2008
2009         client_dn = ldb_dn_get_linearized(p->msg->dn);
2010         if (!client_dn) {
2011                 if (errno == 0) {
2012                         errno = ENOMEM;
2013                 }
2014                 ret = errno;
2015                 krb5_set_error_message(context, ret,
2016                                        "samba_kdc_check_s4u2proxy:"
2017                                        " ldb_dn_get_linearized() failed!");
2018                 return ret;
2019         }
2020
2021         /*
2022          * The main heimdal code already checked that the target_principal
2023          * belongs to the same realm as the client.
2024          *
2025          * So we just need the principal without the realm,
2026          * as that is what is configured in the "msDS-AllowedToDelegateTo"
2027          * attribute.
2028          */
2029         ret = krb5_unparse_name_flags(context, target_principal,
2030                                       KRB5_PRINCIPAL_UNPARSE_NO_REALM, &tmp);
2031         if (ret) {
2032                 talloc_free(mem_ctx);
2033                 krb5_set_error_message(context, ret,
2034                                        "samba_kdc_check_s4u2proxy:"
2035                                        " krb5_unparse_name() failed!");
2036                 return ret;
2037         }
2038         DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] for target[%s]\n",
2039                  client_dn, tmp));
2040
2041         target_principal_name = talloc_strdup(mem_ctx, tmp);
2042         SAFE_FREE(tmp);
2043         if (target_principal_name == NULL) {
2044                 ret = ENOMEM;
2045                 krb5_set_error_message(context, ret,
2046                                        "samba_kdc_check_s4u2proxy:"
2047                                        " talloc_strdup() failed!");
2048                 return ret;
2049         }
2050
2051         el = ldb_msg_find_element(p->msg, "msDS-AllowedToDelegateTo");
2052         if (el == NULL) {
2053                 goto bad_option;
2054         }
2055
2056         val = data_blob_string_const(target_principal_name);
2057
2058         for (i=0; i<el->num_values; i++) {
2059                 struct ldb_val *val1 = &val;
2060                 struct ldb_val *val2 = &el->values[i];
2061                 int cmp;
2062
2063                 if (val1->length != val2->length) {
2064                         continue;
2065                 }
2066
2067                 cmp = strncasecmp((const char *)val1->data,
2068                                   (const char *)val2->data,
2069                                   val1->length);
2070                 if (cmp != 0) {
2071                         continue;
2072                 }
2073
2074                 found = true;
2075                 break;
2076         }
2077
2078         if (!found) {
2079                 goto bad_option;
2080         }
2081
2082         DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] allowed target[%s]\n",
2083                  client_dn, tmp));
2084         talloc_free(mem_ctx);
2085         return 0;
2086
2087 bad_option:
2088         krb5_set_error_message(context, ret,
2089                                "samba_kdc_check_s4u2proxy: client[%s] "
2090                                "not allowed for delegation to target[%s]",
2091                                client_dn,
2092                                target_principal_name);
2093         talloc_free(mem_ctx);
2094         return KRB5KDC_ERR_BADOPTION;
2095 }
2096
2097 NTSTATUS samba_kdc_setup_db_ctx(TALLOC_CTX *mem_ctx, struct samba_kdc_base_context *base_ctx,
2098                                 struct samba_kdc_db_context **kdc_db_ctx_out)
2099 {
2100         int ldb_ret;
2101         struct ldb_message *msg;
2102         struct auth_session_info *session_info;
2103         struct samba_kdc_db_context *kdc_db_ctx;
2104         /* The idea here is very simple.  Using Kerberos to
2105          * authenticate the KDC to the LDAP server is higly likely to
2106          * be circular.
2107          *
2108          * In future we may set this up to use EXERNAL and SSL
2109          * certificates, for now it will almost certainly be NTLMSSP_SET_USERNAME
2110         */
2111
2112         kdc_db_ctx = talloc_zero(mem_ctx, struct samba_kdc_db_context);
2113         if (kdc_db_ctx == NULL) {
2114                 return NT_STATUS_NO_MEMORY;
2115         }
2116         kdc_db_ctx->ev_ctx = base_ctx->ev_ctx;
2117         kdc_db_ctx->lp_ctx = base_ctx->lp_ctx;
2118
2119         /* get default kdc policy */
2120         lpcfg_default_kdc_policy(base_ctx->lp_ctx,
2121                                  &kdc_db_ctx->policy.svc_tkt_lifetime,
2122                                  &kdc_db_ctx->policy.usr_tkt_lifetime,
2123                                  &kdc_db_ctx->policy.renewal_lifetime);
2124
2125         session_info = system_session(kdc_db_ctx->lp_ctx);
2126         if (session_info == NULL) {
2127                 return NT_STATUS_INTERNAL_ERROR;
2128         }
2129
2130         /* Setup the link to LDB */
2131         kdc_db_ctx->samdb = samdb_connect(kdc_db_ctx, base_ctx->ev_ctx,
2132                                           base_ctx->lp_ctx, session_info, 0);
2133         if (kdc_db_ctx->samdb == NULL) {
2134                 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot open samdb for KDC backend!"));
2135                 talloc_free(kdc_db_ctx);
2136                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2137         }
2138
2139         /* Find out our own krbtgt kvno */
2140         ldb_ret = samdb_rodc(kdc_db_ctx->samdb, &kdc_db_ctx->rodc);
2141         if (ldb_ret != LDB_SUCCESS) {
2142                 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine if we are an RODC in KDC backend: %s\n",
2143                           ldb_errstring(kdc_db_ctx->samdb)));
2144                 talloc_free(kdc_db_ctx);
2145                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2146         }
2147         if (kdc_db_ctx->rodc) {
2148                 int my_krbtgt_number;
2149                 const char *secondary_keytab[] = { "msDS-SecondaryKrbTgtNumber", NULL };
2150                 struct ldb_dn *account_dn;
2151                 struct ldb_dn *server_dn = samdb_server_dn(kdc_db_ctx->samdb, kdc_db_ctx);
2152                 if (!server_dn) {
2153                         DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server DN in KDC backend: %s\n",
2154                                   ldb_errstring(kdc_db_ctx->samdb)));
2155                         talloc_free(kdc_db_ctx);
2156                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2157                 }
2158
2159                 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, server_dn,
2160                                              "serverReference", &account_dn);
2161                 if (ldb_ret != LDB_SUCCESS) {
2162                         DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server account in KDC backend: %s\n",
2163                                   ldb_errstring(kdc_db_ctx->samdb)));
2164                         talloc_free(kdc_db_ctx);
2165                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2166                 }
2167
2168                 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, account_dn,
2169                                              "msDS-KrbTgtLink", &kdc_db_ctx->krbtgt_dn);
2170                 talloc_free(account_dn);
2171                 if (ldb_ret != LDB_SUCCESS) {
2172                         DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine RODC krbtgt account in KDC backend: %s\n",
2173                                   ldb_errstring(kdc_db_ctx->samdb)));
2174                         talloc_free(kdc_db_ctx);
2175                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2176                 }
2177
2178                 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2179                                           &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
2180                                           secondary_keytab,
2181                                           DSDB_SEARCH_NO_GLOBAL_CATALOG,
2182                                           "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=*))");
2183                 if (ldb_ret != LDB_SUCCESS) {
2184                         DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read krbtgt account %s in KDC backend to get msDS-SecondaryKrbTgtNumber: %s: %s\n",
2185                                   ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2186                                   ldb_errstring(kdc_db_ctx->samdb),
2187                                   ldb_strerror(ldb_ret)));
2188                         talloc_free(kdc_db_ctx);
2189                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2190                 }
2191                 my_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
2192                 if (my_krbtgt_number == -1) {
2193                         DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read msDS-SecondaryKrbTgtNumber from krbtgt account %s in KDC backend: got %d\n",
2194                                   ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2195                                   my_krbtgt_number));
2196                         talloc_free(kdc_db_ctx);
2197                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2198                 }
2199                 kdc_db_ctx->my_krbtgt_number = my_krbtgt_number;
2200
2201         } else {
2202                 kdc_db_ctx->my_krbtgt_number = 0;
2203                 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2204                                           &msg,
2205                                           ldb_get_default_basedn(kdc_db_ctx->samdb),
2206                                           LDB_SCOPE_SUBTREE,
2207                                           krbtgt_attrs,
2208                                           DSDB_SEARCH_NO_GLOBAL_CATALOG,
2209                                           "(&(objectClass=user)(samAccountName=krbtgt))");
2210
2211                 if (ldb_ret != LDB_SUCCESS) {
2212                         DEBUG(1, ("samba_kdc_fetch: could not find own KRBTGT in DB: %s\n", ldb_errstring(kdc_db_ctx->samdb)));
2213                         talloc_free(kdc_db_ctx);
2214                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2215                 }
2216                 kdc_db_ctx->krbtgt_dn = talloc_steal(kdc_db_ctx, msg->dn);
2217                 kdc_db_ctx->my_krbtgt_number = 0;
2218                 talloc_free(msg);
2219         }
2220         *kdc_db_ctx_out = kdc_db_ctx;
2221         return NT_STATUS_OK;
2222 }