source4/kdc/hdb-samba4.c

   1 /*
   2  * Copyright (c) 1999-2001, 2003, PADL Software Pty Ltd.
   3  * Copyright (c) 2004-2009, Andrew Bartlett <abartlet@samba.org>.
   4  * Copyright (c) 2004, Stefan Metzmacher <metze@samba.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * 3. Neither the name of PADL Software  nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "includes.h"
  36 #include "system/time.h"
  37 #include "../libds/common/flags.h"
  38 #include "lib/ldb/include/ldb.h"
  39 #include "lib/ldb/include/ldb_errors.h"
  40 #include "librpc/gen_ndr/netlogon.h"
  41 #include "libcli/security/security.h"
  42 #include "auth/auth.h"
  43 #include "auth/credentials/credentials.h"
  44 #include "auth/auth_sam.h"
  45 #include "../lib/util/util_ldb.h"
  46 #include "dsdb/samdb/samdb.h"
  47 #include "librpc/ndr/libndr.h"
  48 #include "librpc/gen_ndr/ndr_drsblobs.h"
  49 #include "librpc/gen_ndr/lsa.h"
  50 #include "libcli/auth/libcli_auth.h"
  51 #include "param/param.h"
  52 #include "events/events.h"
  53 #include "kdc/kdc.h"
  54 #include "../lib/crypto/md4.h"
  55
  56 enum hdb_samba4_ent_type
  57 { HDB_SAMBA4_ENT_TYPE_CLIENT, HDB_SAMBA4_ENT_TYPE_SERVER,
  58   HDB_SAMBA4_ENT_TYPE_KRBTGT, HDB_SAMBA4_ENT_TYPE_TRUST, HDB_SAMBA4_ENT_TYPE_ANY };
  59
  60 enum trust_direction {
  61         UNKNOWN = 0,
  62         INBOUND = LSA_TRUST_DIRECTION_INBOUND,
  63         OUTBOUND = LSA_TRUST_DIRECTION_OUTBOUND
  64 };
  65
  66 static const char *trust_attrs[] = {
  67         "trustPartner",
  68         "trustAuthIncoming",
  69         "trustAuthOutgoing",
  70         "whenCreated",
  71         "msDS-SupportedEncryptionTypes",
  72         "trustAttributes",
  73         "trustDirection",
  74         "trustType",
  75         NULL
  76 };
  77
  78 static KerberosTime ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, KerberosTime default_val)
  79 {
  80     const char *tmp;
  81     const char *gentime;
  82     struct tm tm;
  83
  84     gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
  85     if (!gentime)
  86         return default_val;
  87
  88     tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
  89     if (tmp == NULL) {
  90             return default_val;
  91     }
  92
  93     return timegm(&tm);
  94 }
  95
  96 static HDBFlags uf2HDBFlags(krb5_context context, int userAccountControl, enum hdb_samba4_ent_type ent_type)
  97 {
  98         HDBFlags flags = int2HDBFlags(0);
  99
 100         /* we don't allow kadmin deletes */
 101         flags.immutable = 1;
 102
 103         /* mark the principal as invalid to start with */
 104         flags.invalid = 1;
 105
 106         flags.renewable = 1;
 107
 108         /* All accounts are servers, but this may be disabled again in the caller */
 109         flags.server = 1;
 110
 111         /* Account types - clear the invalid bit if it turns out to be valid */
 112         if (userAccountControl & UF_NORMAL_ACCOUNT) {
 113                 if (ent_type == HDB_SAMBA4_ENT_TYPE_CLIENT || ent_type == HDB_SAMBA4_ENT_TYPE_ANY) {
 114                         flags.client = 1;
 115                 }
 116                 flags.invalid = 0;
 117         }
 118
 119         if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
 120                 if (ent_type == HDB_SAMBA4_ENT_TYPE_CLIENT || ent_type == HDB_SAMBA4_ENT_TYPE_ANY) {
 121                         flags.client = 1;
 122                 }
 123                 flags.invalid = 0;
 124         }
 125         if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
 126                 if (ent_type == HDB_SAMBA4_ENT_TYPE_CLIENT || ent_type == HDB_SAMBA4_ENT_TYPE_ANY) {
 127                         flags.client = 1;
 128                 }
 129                 flags.invalid = 0;
 130         }
 131         if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
 132                 if (ent_type == HDB_SAMBA4_ENT_TYPE_CLIENT || ent_type == HDB_SAMBA4_ENT_TYPE_ANY) {
 133                         flags.client = 1;
 134                 }
 135                 flags.invalid = 0;
 136         }
 137
 138         /* Not permitted to act as a client if disabled */
 139         if (userAccountControl & UF_ACCOUNTDISABLE) {
 140                 flags.client = 0;
 141         }
 142         if (userAccountControl & UF_LOCKOUT) {
 143                 flags.invalid = 1;
 144         }
 145 /*
 146         if (userAccountControl & UF_PASSWORD_NOTREQD) {
 147                 flags.invalid = 1;
 148         }
 149 */
 150 /*
 151         UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
 152 */
 153         if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
 154                 flags.invalid = 1;
 155         }
 156
 157 /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in hdb_samba4_message2entry() */
 158
 159 /*
 160         if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
 161                 flags.invalid = 1;
 162         }
 163 */
 164         if (userAccountControl & UF_SMARTCARD_REQUIRED) {
 165                 flags.require_hwauth = 1;
 166         }
 167         if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
 168                 flags.ok_as_delegate = 1;
 169         }
 170         if (!(userAccountControl & UF_NOT_DELEGATED)) {
 171                 flags.forwardable = 1;
 172                 flags.proxiable = 1;
 173         }
 174
 175         if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
 176                 flags.require_preauth = 0;
 177         } else {
 178                 flags.require_preauth = 1;
 179
 180         }
 181         return flags;
 182 }
 183
 184 static int hdb_samba4_destructor(struct hdb_samba4_private *p)
 185 {
 186     hdb_entry_ex *entry_ex = p->entry_ex;
 187     free_hdb_entry(&entry_ex->entry);
 188     return 0;
 189 }
 190
 191 static void hdb_samba4_free_entry(krb5_context context, hdb_entry_ex *entry_ex)
 192 {
 193         talloc_free(entry_ex->ctx);
 194 }
 195
 196 static krb5_error_code hdb_samba4_message2entry_keys(krb5_context context,
 197                                               struct smb_iconv_convenience *iconv_convenience,
 198                                               TALLOC_CTX *mem_ctx,
 199                                               struct ldb_message *msg,
 200                                               unsigned int userAccountControl,
 201                                               hdb_entry_ex *entry_ex)
 202 {
 203         krb5_error_code ret = 0;
 204         enum ndr_err_code ndr_err;
 205         struct samr_Password *hash;
 206         const struct ldb_val *sc_val;
 207         struct supplementalCredentialsBlob scb;
 208         struct supplementalCredentialsPackage *scpk = NULL;
 209         bool newer_keys = false;
 210         struct package_PrimaryKerberosBlob _pkb;
 211         struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
 212         struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
 213         uint32_t i;
 214         uint32_t allocated_keys = 0;
 215
 216         entry_ex->entry.keys.val = NULL;
 217         entry_ex->entry.keys.len = 0;
 218
 219         entry_ex->entry.kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
 220
 221         /* Get keys from the db */
 222
 223         hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
 224         sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
 225
 226         /* unicodePwd for enctype 0x17 (23) if present */
 227         if (hash) {
 228                 allocated_keys++;
 229         }
 230
 231         /* supplementalCredentials if present */
 232         if (sc_val) {
 233                 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, iconv_convenience, &scb,
 234                                                    (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
 235                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 236                         dump_data(0, sc_val->data, sc_val->length);
 237                         ret = EINVAL;
 238                         goto out;
 239                 }
 240
 241                 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
 242                         NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
 243                         ret = EINVAL;
 244                         goto out;
 245                 }
 246
 247                 for (i=0; i < scb.sub.num_packages; i++) {
 248                         if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
 249                                 scpk = &scb.sub.packages[i];
 250                                 if (!scpk->data || !scpk->data[0]) {
 251                                         scpk = NULL;
 252                                         continue;
 253                                 }
 254                                 newer_keys = true;
 255                                 break;
 256                         } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
 257                                 scpk = &scb.sub.packages[i];
 258                                 if (!scpk->data || !scpk->data[0]) {
 259                                         scpk = NULL;
 260                                 }
 261                                 /*
 262                                  * we don't break here in hope to find
 263                                  * a Kerberos-Newer-Keys package
 264                                  */
 265                         }
 266                 }
 267         }
 268         /*
 269          * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
 270          * of supplementalCredentials
 271          */
 272         if (scpk) {
 273                 DATA_BLOB blob;
 274
 275                 blob = strhex_to_data_blob(mem_ctx, scpk->data);
 276                 if (!blob.data) {
 277                         ret = ENOMEM;
 278                         goto out;
 279                 }
 280
 281                 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
 282                 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, iconv_convenience, &_pkb,
 283                                                (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
 284                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 285                         ret = EINVAL;
 286                         krb5_set_error_message(context, ret, "hdb_samba4_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 287                         krb5_warnx(context, "hdb_samba4_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 288                         goto out;
 289                 }
 290
 291                 if (newer_keys && _pkb.version != 4) {
 292                         ret = EINVAL;
 293                         krb5_set_error_message(context, ret, "hdb_samba4_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 294                         krb5_warnx(context, "hdb_samba4_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 295                         goto out;
 296                 }
 297
 298                 if (!newer_keys && _pkb.version != 3) {
 299                         ret = EINVAL;
 300                         krb5_set_error_message(context, ret, "hdb_samba4_message2entry_keys: could not parse Primary:Kerberos not version 3");
 301                         krb5_warnx(context, "hdb_samba4_message2entry_keys: could not parse Primary:Kerberos not version 3");
 302                         goto out;
 303                 }
 304
 305                 if (_pkb.version == 4) {
 306                         pkb4 = &_pkb.ctr.ctr4;
 307                         allocated_keys += pkb4->num_keys;
 308                 } else if (_pkb.version == 3) {
 309                         pkb3 = &_pkb.ctr.ctr3;
 310                         allocated_keys += pkb3->num_keys;
 311                 }
 312         }
 313
 314         if (allocated_keys == 0) {
 315                 /* oh, no password.  Apparently (comment in
 316                  * hdb-ldap.c) this violates the ASN.1, but this
 317                  * allows an entry with no keys (yet). */
 318                 return 0;
 319         }
 320
 321         /* allocate space to decode into */
 322         entry_ex->entry.keys.len = 0;
 323         entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(Key));
 324         if (entry_ex->entry.keys.val == NULL) {
 325                 ret = ENOMEM;
 326                 goto out;
 327         }
 328
 329         if (hash && !(userAccountControl & UF_USE_DES_KEY_ONLY)) {
 330                 Key key;
 331
 332                 key.mkvno = 0;
 333                 key.salt = NULL; /* No salt for this enc type */
 334
 335                 ret = krb5_keyblock_init(context,
 336                                          ENCTYPE_ARCFOUR_HMAC,
 337                                          hash->hash, sizeof(hash->hash),
 338                                          &key.key);
 339                 if (ret) {
 340                         goto out;
 341                 }
 342
 343                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 344                 entry_ex->entry.keys.len++;
 345         }
 346
 347         if (pkb4) {
 348                 for (i=0; i < pkb4->num_keys; i++) {
 349                         bool use = true;
 350                         Key key;
 351
 352                         if (!pkb4->keys[i].value) continue;
 353
 354                         if (userAccountControl & UF_USE_DES_KEY_ONLY) {
 355                                 switch (pkb4->keys[i].keytype) {
 356                                 case ENCTYPE_DES_CBC_CRC:
 357                                 case ENCTYPE_DES_CBC_MD5:
 358                                         break;
 359                                 default:
 360                                         use = false;
 361                                         break;
 362                                 }
 363                         }
 364
 365                         if (!use) continue;
 366
 367                         key.mkvno = 0;
 368                         key.salt = NULL;
 369
 370                         if (pkb4->salt.string) {
 371                                 DATA_BLOB salt;
 372
 373                                 salt = data_blob_string_const(pkb4->salt.string);
 374
 375                                 key.salt = calloc(1, sizeof(*key.salt));
 376                                 if (key.salt == NULL) {
 377                                         ret = ENOMEM;
 378                                         goto out;
 379                                 }
 380
 381                                 key.salt->type = hdb_pw_salt;
 382
 383                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
 384                                 if (ret) {
 385                                         free(key.salt);
 386                                         key.salt = NULL;
 387                                         goto out;
 388                                 }
 389                         }
 390
 391                         /* TODO: maybe pass the iteration_count somehow... */
 392
 393                         ret = krb5_keyblock_init(context,
 394                                                  pkb4->keys[i].keytype,
 395                                                  pkb4->keys[i].value->data,
 396                                                  pkb4->keys[i].value->length,
 397                                                  &key.key);
 398                         if (ret == KRB5_PROG_ETYPE_NOSUPP) {
 399                                 DEBUG(2,("Unsupported keytype ignored - type %u\n",
 400                                          pkb4->keys[i].keytype));
 401                                 ret = 0;
 402                                 continue;
 403                         }
 404                         if (ret) {
 405                                 if (key.salt) {
 406                                         free_Salt(key.salt);
 407                                         free(key.salt);
 408                                         key.salt = NULL;
 409                                 }
 410                                 goto out;
 411                         }
 412
 413                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 414                         entry_ex->entry.keys.len++;
 415                 }
 416         } else if (pkb3) {
 417                 for (i=0; i < pkb3->num_keys; i++) {
 418                         bool use = true;
 419                         Key key;
 420
 421                         if (!pkb3->keys[i].value) continue;
 422
 423                         if (userAccountControl & UF_USE_DES_KEY_ONLY) {
 424                                 switch (pkb3->keys[i].keytype) {
 425                                 case ENCTYPE_DES_CBC_CRC:
 426                                 case ENCTYPE_DES_CBC_MD5:
 427                                         break;
 428                                 default:
 429                                         use = false;
 430                                         break;
 431                                 }
 432                         }
 433
 434                         if (!use) continue;
 435
 436                         key.mkvno = 0;
 437                         key.salt = NULL;
 438
 439                         if (pkb3->salt.string) {
 440                                 DATA_BLOB salt;
 441
 442                                 salt = data_blob_string_const(pkb3->salt.string);
 443
 444                                 key.salt = calloc(1, sizeof(*key.salt));
 445                                 if (key.salt == NULL) {
 446                                         ret = ENOMEM;
 447                                         goto out;
 448                                 }
 449
 450                                 key.salt->type = hdb_pw_salt;
 451
 452                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
 453                                 if (ret) {
 454                                         free(key.salt);
 455                                         key.salt = NULL;
 456                                         goto out;
 457                                 }
 458                         }
 459
 460                         ret = krb5_keyblock_init(context,
 461                                                  pkb3->keys[i].keytype,
 462                                                  pkb3->keys[i].value->data,
 463                                                  pkb3->keys[i].value->length,
 464                                                  &key.key);
 465                         if (ret) {
 466                                 if (key.salt) {
 467                                         free_Salt(key.salt);
 468                                         free(key.salt);
 469                                         key.salt = NULL;
 470                                 }
 471                                 goto out;
 472                         }
 473
 474                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 475                         entry_ex->entry.keys.len++;
 476                 }
 477         }
 478
 479 out:
 480         if (ret != 0) {
 481                 entry_ex->entry.keys.len = 0;
 482         }
 483         if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
 484                 free(entry_ex->entry.keys.val);
 485                 entry_ex->entry.keys.val = NULL;
 486         }
 487         return ret;
 488 }
 489
 490 /*
 491  * Construct an hdb_entry from a directory entry.
 492  */
 493 static krb5_error_code hdb_samba4_message2entry(krb5_context context, HDB *db,
 494                                          struct loadparm_context *lp_ctx,
 495                                          TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 496                                          enum hdb_samba4_ent_type ent_type,
 497                                          struct ldb_dn *realm_dn,
 498                                          struct ldb_message *msg,
 499                                          hdb_entry_ex *entry_ex)
 500 {
 501         unsigned int userAccountControl;
 502         int i;
 503         krb5_error_code ret = 0;
 504         krb5_boolean is_computer = FALSE;
 505         char *realm = strupper_talloc(mem_ctx, lp_realm(lp_ctx));
 506
 507         struct hdb_samba4_private *p;
 508         NTTIME acct_expiry;
 509         NTSTATUS status;
 510
 511         uint32_t rid;
 512         struct ldb_message_element *objectclasses;
 513         struct ldb_val computer_val;
 514         const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
 515         computer_val.data = discard_const_p(uint8_t,"computer");
 516         computer_val.length = strlen((const char *)computer_val.data);
 517
 518         if (!samAccountName) {
 519                 ret = ENOENT;
 520                 krb5_set_error_message(context, ret, "hdb_samba4_message2entry: no samAccountName present");
 521                 goto out;
 522         }
 523
 524         objectclasses = ldb_msg_find_element(msg, "objectClass");
 525
 526         if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
 527                 is_computer = TRUE;
 528         }
 529
 530         memset(entry_ex, 0, sizeof(*entry_ex));
 531
 532         if (!realm) {
 533                 ret = ENOMEM;
 534                 krb5_set_error_message(context, ret, "talloc_strdup: out of memory");
 535                 goto out;
 536         }
 537
 538         p = talloc(mem_ctx, struct hdb_samba4_private);
 539         if (!p) {
 540                 ret = ENOMEM;
 541                 goto out;
 542         }
 543
 544         p->entry_ex = entry_ex;
 545         p->iconv_convenience = lp_iconv_convenience(lp_ctx);
 546         p->lp_ctx = lp_ctx;
 547         p->realm_dn = talloc_reference(p, realm_dn);
 548         if (!p->realm_dn) {
 549                 ret = ENOMEM;
 550                 goto out;
 551         }
 552
 553         talloc_set_destructor(p, hdb_samba4_destructor);
 554
 555         entry_ex->ctx = p;
 556         entry_ex->free_entry = hdb_samba4_free_entry;
 557
 558         userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
 559
 560
 561         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 562         if (ent_type == HDB_SAMBA4_ENT_TYPE_ANY && principal == NULL) {
 563                 krb5_make_principal(context, &entry_ex->entry.principal, realm, samAccountName, NULL);
 564         } else {
 565                 ret = copy_Principal(principal, entry_ex->entry.principal);
 566                 if (ret) {
 567                         krb5_clear_error_message(context);
 568                         goto out;
 569                 }
 570
 571                 /* While we have copied the client principal, tests
 572                  * show that Win2k3 returns the 'corrected' realm, not
 573                  * the client-specified realm.  This code attempts to
 574                  * replace the client principal's realm with the one
 575                  * we determine from our records */
 576
 577                 /* this has to be with malloc() */
 578                 krb5_principal_set_realm(context, entry_ex->entry.principal, realm);
 579         }
 580
 581         /* First try and figure out the flags based on the userAccountControl */
 582         entry_ex->entry.flags = uf2HDBFlags(context, userAccountControl, ent_type);
 583
 584         /* Windows 2008 seems to enforce this (very sensible) rule by
 585          * default - don't allow offline attacks on a user's password
 586          * by asking for a ticket to them as a service (encrypted with
 587          * their probably patheticly insecure password) */
 588
 589         if (entry_ex->entry.flags.server
 590             && lp_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
 591                 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
 592                         entry_ex->entry.flags.server = 0;
 593                 }
 594         }
 595
 596         {
 597                 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
 598                  * of the Heimdal KDC.  They are stored in a the traditional
 599                  * DB for audit purposes, and still form part of the structure
 600                  * we must return */
 601
 602                 /* use 'whenCreated' */
 603                 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 604                 /* use '???' */
 605                 entry_ex->entry.created_by.principal = NULL;
 606
 607                 entry_ex->entry.modified_by = (Event *) malloc(sizeof(Event));
 608                 if (entry_ex->entry.modified_by == NULL) {
 609                         ret = ENOMEM;
 610                         krb5_set_error_message(context, ret, "malloc: out of memory");
 611                         goto out;
 612                 }
 613
 614                 /* use 'whenChanged' */
 615                 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
 616                 /* use '???' */
 617                 entry_ex->entry.modified_by->principal = NULL;
 618         }
 619
 620
 621         /* The lack of password controls etc applies to krbtgt by
 622          * virtue of being that particular RID */
 623         status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
 624
 625         if (!NT_STATUS_IS_OK(status)) {
 626                 ret = EINVAL;
 627                 goto out;
 628         }
 629
 630         if (rid == DOMAIN_RID_KRBTGT) {
 631                 entry_ex->entry.valid_end = NULL;
 632                 entry_ex->entry.pw_end = NULL;
 633
 634                 entry_ex->entry.flags.invalid = 0;
 635                 entry_ex->entry.flags.server = 1;
 636
 637                 /* Don't mark all requests for the krbtgt/realm as
 638                  * 'change password', as otherwise we could get into
 639                  * trouble, and not enforce the password expirty.
 640                  * Instead, only do it when request is for the kpasswd service */
 641                 if (ent_type == HDB_SAMBA4_ENT_TYPE_SERVER
 642                     && principal->name.name_string.len == 2
 643                     && (strcmp(principal->name.name_string.val[0], "kadmin") == 0)
 644                     && (strcmp(principal->name.name_string.val[1], "changepw") == 0)
 645                     && lp_is_my_domain_or_realm(lp_ctx, principal->realm)) {
 646                         entry_ex->entry.flags.change_pw = 1;
 647                 }
 648                 entry_ex->entry.flags.client = 0;
 649                 entry_ex->entry.flags.forwardable = 1;
 650                 entry_ex->entry.flags.ok_as_delegate = 1;
 651         } else if (entry_ex->entry.flags.server && ent_type == HDB_SAMBA4_ENT_TYPE_SERVER) {
 652                 /* The account/password expiry only applies when the account is used as a
 653                  * client (ie password login), not when used as a server */
 654
 655                 /* Make very well sure we don't use this for a client,
 656                  * it could bypass the password restrictions */
 657                 entry_ex->entry.flags.client = 0;
 658
 659                 entry_ex->entry.valid_end = NULL;
 660                 entry_ex->entry.pw_end = NULL;
 661
 662         } else {
 663                 NTTIME must_change_time
 664                         = samdb_result_force_password_change((struct ldb_context *)db->hdb_db, mem_ctx,
 665                                                              realm_dn, msg);
 666                 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
 667                         entry_ex->entry.pw_end = NULL;
 668                 } else {
 669                         entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
 670                         if (entry_ex->entry.pw_end == NULL) {
 671                                 ret = ENOMEM;
 672                                 goto out;
 673                         }
 674                         *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
 675                 }
 676
 677                 acct_expiry = samdb_result_account_expires(msg);
 678                 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
 679                         entry_ex->entry.valid_end = NULL;
 680                 } else {
 681                         entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
 682                         if (entry_ex->entry.valid_end == NULL) {
 683                                 ret = ENOMEM;
 684                                 goto out;
 685                         }
 686                         *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
 687                 }
 688         }
 689
 690         entry_ex->entry.valid_start = NULL;
 691
 692         entry_ex->entry.max_life = NULL;
 693
 694         entry_ex->entry.max_renew = NULL;
 695
 696         entry_ex->entry.generation = NULL;
 697
 698         /* Get keys from the db */
 699         ret = hdb_samba4_message2entry_keys(context, p->iconv_convenience, p, msg, userAccountControl, entry_ex);
 700         if (ret) {
 701                 /* Could be bougus data in the entry, or out of memory */
 702                 goto out;
 703         }
 704
 705         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 706         if (entry_ex->entry.etypes == NULL) {
 707                 krb5_clear_error_message(context);
 708                 ret = ENOMEM;
 709                 goto out;
 710         }
 711         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 712         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 713         if (entry_ex->entry.etypes->val == NULL) {
 714                 krb5_clear_error_message(context);
 715                 ret = ENOMEM;
 716                 goto out;
 717         }
 718         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 719                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 720         }
 721
 722
 723         p->msg = talloc_steal(p, msg);
 724         p->samdb = (struct ldb_context *)db->hdb_db;
 725
 726 out:
 727         if (ret != 0) {
 728                 /* This doesn't free ent itself, that is for the eventual caller to do */
 729                 hdb_free_entry(context, entry_ex);
 730         } else {
 731                 talloc_steal(db, entry_ex->ctx);
 732         }
 733
 734         return ret;
 735 }
 736
 737 /*
 738  * Construct an hdb_entry from a directory entry.
 739  */
 740 static krb5_error_code hdb_samba4_trust_message2entry(krb5_context context, HDB *db,
 741                                                struct loadparm_context *lp_ctx,
 742                                                TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 743                                                enum trust_direction direction,
 744                                                struct ldb_dn *realm_dn,
 745                                                struct ldb_message *msg,
 746                                                hdb_entry_ex *entry_ex)
 747 {
 748
 749         const char *dnsdomain;
 750         char *realm;
 751         DATA_BLOB password_utf16;
 752         struct samr_Password password_hash;
 753         const struct ldb_val *password_val;
 754         struct trustAuthInOutBlob password_blob;
 755         struct hdb_samba4_private *p;
 756
 757         enum ndr_err_code ndr_err;
 758         int i, ret, trust_direction_flags;
 759
 760         p = talloc(mem_ctx, struct hdb_samba4_private);
 761         if (!p) {
 762                 ret = ENOMEM;
 763                 goto out;
 764         }
 765
 766         p->entry_ex = entry_ex;
 767         p->iconv_convenience = lp_iconv_convenience(lp_ctx);
 768         p->lp_ctx = lp_ctx;
 769         p->realm_dn = realm_dn;
 770
 771         talloc_set_destructor(p, hdb_samba4_destructor);
 772
 773         entry_ex->ctx = p;
 774         entry_ex->free_entry = hdb_samba4_free_entry;
 775
 776         /* use 'whenCreated' */
 777         entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 778         /* use '???' */
 779         entry_ex->entry.created_by.principal = NULL;
 780
 781         entry_ex->entry.valid_start = NULL;
 782
 783         trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
 784
 785         if (direction == INBOUND) {
 786                 realm = strupper_talloc(mem_ctx, lp_realm(lp_ctx));
 787                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
 788
 789         } else { /* OUTBOUND */
 790                 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
 791                 realm = strupper_talloc(mem_ctx, dnsdomain);
 792                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
 793         }
 794
 795         if (!password_val || !(trust_direction_flags & direction)) {
 796                 ret = ENOENT;
 797                 goto out;
 798         }
 799
 800         ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, p->iconv_convenience, &password_blob,
 801                                            (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
 802         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 803                 ret = EINVAL;
 804                 goto out;
 805         }
 806
 807         entry_ex->entry.kvno = -1;
 808         for (i=0; i < password_blob.count; i++) {
 809                 if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_VERSION) {
 810                         entry_ex->entry.kvno = password_blob.current->array[i].AuthInfo.version.version;
 811                 }
 812         }
 813
 814         for (i=0; i < password_blob.count; i++) {
 815                 if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
 816                         password_utf16 = data_blob_const(password_blob.current->array[i].AuthInfo.clear.password,
 817                                                          password_blob.current->array[i].AuthInfo.clear.size);
 818                         /* In the future, generate all sorts of
 819                          * hashes, but for now we can't safely convert
 820                          * the random strings windows uses into
 821                          * utf8 */
 822
 823                         /* but as it is utf16 already, we can get the NT password/arcfour-hmac-md5 key */
 824                         mdfour(password_hash.hash, password_utf16.data, password_utf16.length);
 825                         break;
 826                 } else if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
 827                         password_hash = password_blob.current->array[i].AuthInfo.nt4owf.password;
 828                         break;
 829                 }
 830         }
 831         entry_ex->entry.keys.len = 0;
 832         entry_ex->entry.keys.val = NULL;
 833
 834         if (i < password_blob.count) {
 835                 Key key;
 836                 /* Must have found a cleartext or MD4 password */
 837                 entry_ex->entry.keys.val = calloc(1, sizeof(Key));
 838
 839                 key.mkvno = 0;
 840                 key.salt = NULL; /* No salt for this enc type */
 841
 842                 if (entry_ex->entry.keys.val == NULL) {
 843                         ret = ENOMEM;
 844                         goto out;
 845                 }
 846
 847                 ret = krb5_keyblock_init(context,
 848                                          ENCTYPE_ARCFOUR_HMAC,
 849                                          password_hash.hash, sizeof(password_hash.hash),
 850                                          &key.key);
 851
 852                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 853                 entry_ex->entry.keys.len++;
 854         }
 855
 856         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 857
 858         ret = copy_Principal(principal, entry_ex->entry.principal);
 859         if (ret) {
 860                 krb5_clear_error_message(context);
 861                 goto out;
 862         }
 863
 864         /* While we have copied the client principal, tests
 865          * show that Win2k3 returns the 'corrected' realm, not
 866          * the client-specified realm.  This code attempts to
 867          * replace the client principal's realm with the one
 868          * we determine from our records */
 869
 870         krb5_principal_set_realm(context, entry_ex->entry.principal, realm);
 871         entry_ex->entry.flags = int2HDBFlags(0);
 872         entry_ex->entry.flags.immutable = 1;
 873         entry_ex->entry.flags.invalid = 0;
 874         entry_ex->entry.flags.server = 1;
 875         entry_ex->entry.flags.require_preauth = 1;
 876
 877         entry_ex->entry.pw_end = NULL;
 878
 879         entry_ex->entry.max_life = NULL;
 880
 881         entry_ex->entry.max_renew = NULL;
 882
 883         entry_ex->entry.generation = NULL;
 884
 885         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 886         if (entry_ex->entry.etypes == NULL) {
 887                 krb5_clear_error_message(context);
 888                 ret = ENOMEM;
 889                 goto out;
 890         }
 891         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 892         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 893         if (entry_ex->entry.etypes->val == NULL) {
 894                 krb5_clear_error_message(context);
 895                 ret = ENOMEM;
 896                 goto out;
 897         }
 898         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 899                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 900         }
 901
 902
 903         p->msg = talloc_steal(p, msg);
 904         p->samdb = (struct ldb_context *)db->hdb_db;
 905
 906 out:
 907         if (ret != 0) {
 908                 /* This doesn't free ent itself, that is for the eventual caller to do */
 909                 hdb_free_entry(context, entry_ex);
 910         } else {
 911                 talloc_steal(db, entry_ex->ctx);
 912         }
 913
 914         return ret;
 915
 916 }
 917
 918 static krb5_error_code hdb_samba4_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
 919                                         TALLOC_CTX *mem_ctx,
 920                                         const char *realm,
 921                                         struct ldb_dn *realm_dn,
 922                                         struct ldb_message **pmsg)
 923 {
 924         int lret;
 925         krb5_error_code ret;
 926         char *filter = NULL;
 927         const char * const *attrs = trust_attrs;
 928
 929         struct ldb_result *res = NULL;
 930         filter = talloc_asprintf(mem_ctx, "(&(objectClass=trustedDomain)(|(flatname=%s)(trustPartner=%s)))", realm, realm);
 931
 932         if (!filter) {
 933                 ret = ENOMEM;
 934                 krb5_set_error_message(context, ret, "talloc_asprintf: out of memory");
 935                 return ret;
 936         }
 937
 938         lret = ldb_search(ldb_ctx, mem_ctx, &res,
 939                           ldb_get_default_basedn(ldb_ctx),
 940                           LDB_SCOPE_SUBTREE, attrs, "%s", filter);
 941         if (lret != LDB_SUCCESS) {
 942                 DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx)));
 943                 return HDB_ERR_NOENTRY;
 944         } else if (res->count == 0 || res->count > 1) {
 945                 DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count));
 946                 talloc_free(res);
 947                 return HDB_ERR_NOENTRY;
 948         }
 949         talloc_steal(mem_ctx, res->msgs);
 950         *pmsg = res->msgs[0];
 951         talloc_free(res);
 952         return 0;
 953 }
 954
 955 static krb5_error_code hdb_samba4_open(krb5_context context, HDB *db, int flags, mode_t mode)
 956 {
 957         if (db->hdb_master_key_set) {
 958                 krb5_error_code ret = HDB_ERR_NOENTRY;
 959                 krb5_warnx(context, "hdb_samba4_open: use of a master key incompatible with LDB\n");
 960                 krb5_set_error_message(context, ret, "hdb_samba4_open: use of a master key incompatible with LDB\n");
 961                 return ret;
 962         }
 963
 964         return 0;
 965 }
 966
 967 static krb5_error_code hdb_samba4_close(krb5_context context, HDB *db)
 968 {
 969         return 0;
 970 }
 971
 972 static krb5_error_code hdb_samba4_lock(krb5_context context, HDB *db, int operation)
 973 {
 974         return 0;
 975 }
 976
 977 static krb5_error_code hdb_samba4_unlock(krb5_context context, HDB *db)
 978 {
 979         return 0;
 980 }
 981
 982 static krb5_error_code hdb_samba4_rename(krb5_context context, HDB *db, const char *new_name)
 983 {
 984         return HDB_ERR_DB_INUSE;
 985 }
 986
 987 static krb5_error_code hdb_samba4_lookup_client(krb5_context context, HDB *db,
 988                                                 struct loadparm_context *lp_ctx,
 989                                                 TALLOC_CTX *mem_ctx,
 990                                                 krb5_const_principal principal,
 991                                                 const char **attrs,
 992                                                 struct ldb_dn **realm_dn,
 993                                                 struct ldb_message **msg) {
 994         NTSTATUS nt_status;
 995         char *principal_string;
 996         krb5_error_code ret;
 997
 998         ret = krb5_unparse_name(context, principal, &principal_string);
 999
1000         if (ret != 0) {
1001                 return ret;
1002         }
1003
1004         nt_status = sam_get_results_principal((struct ldb_context *)db->hdb_db,
1005                                               mem_ctx, principal_string, attrs,
1006                                               realm_dn, msg);
1007         free(principal_string);
1008         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1009                 return HDB_ERR_NOENTRY;
1010         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1011                 return ENOMEM;
1012         } else if (!NT_STATUS_IS_OK(nt_status)) {
1013                 return EINVAL;
1014         }
1015
1016         return ret;
1017 }
1018
1019 static krb5_error_code hdb_samba4_fetch_client(krb5_context context, HDB *db,
1020                                                struct loadparm_context *lp_ctx,
1021                                                TALLOC_CTX *mem_ctx,
1022                                                krb5_const_principal principal,
1023                                                unsigned flags,
1024                                                hdb_entry_ex *entry_ex) {
1025         struct ldb_dn *realm_dn;
1026         krb5_error_code ret;
1027         struct ldb_message *msg = NULL;
1028
1029         ret = hdb_samba4_lookup_client(context, db, lp_ctx,
1030                                        mem_ctx, principal, user_attrs,
1031                                        &realm_dn, &msg);
1032         if (ret != 0) {
1033                 return ret;
1034         }
1035
1036         ret = hdb_samba4_message2entry(context, db, lp_ctx, mem_ctx,
1037                                        principal, HDB_SAMBA4_ENT_TYPE_CLIENT,
1038                                        realm_dn, msg, entry_ex);
1039         return ret;
1040 }
1041
1042 static krb5_error_code hdb_samba4_fetch_krbtgt(krb5_context context, HDB *db,
1043                                         struct loadparm_context *lp_ctx,
1044                                         TALLOC_CTX *mem_ctx,
1045                                         krb5_const_principal principal,
1046                                         unsigned flags,
1047                                         hdb_entry_ex *entry_ex)
1048 {
1049         krb5_error_code ret;
1050         struct ldb_message *msg = NULL;
1051         struct ldb_dn *realm_dn = ldb_get_default_basedn(db->hdb_db);
1052         const char *realm;
1053
1054         krb5_principal alloc_principal = NULL;
1055         if (principal->name.name_string.len != 2
1056             || (strcmp(principal->name.name_string.val[0], KRB5_TGS_NAME) != 0)) {
1057                 /* Not a krbtgt */
1058                 return HDB_ERR_NOENTRY;
1059         }
1060
1061         /* krbtgt case.  Either us or a trusted realm */
1062
1063         if (lp_is_my_domain_or_realm(lp_ctx, principal->realm)
1064             && lp_is_my_domain_or_realm(lp_ctx, principal->name.name_string.val[1])) {
1065                 /* us */
1066                 /* Cludge, cludge cludge.  If the realm part of krbtgt/realm,
1067                  * is in our db, then direct the caller at our primary
1068                  * krbtgt */
1069
1070                 int lret;
1071                 char *realm_fixed;
1072
1073                 lret = gendb_search_single_extended_dn(db->hdb_db, mem_ctx,
1074                                                        realm_dn, LDB_SCOPE_SUBTREE,
1075                                                        &msg, krbtgt_attrs,
1076                                                        "(&(objectClass=user)(samAccountName=krbtgt))");
1077                 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1078                         krb5_warnx(context, "hdb_samba4_fetch: could not find own KRBTGT in DB!");
1079                         krb5_set_error_message(context, HDB_ERR_NOENTRY, "hdb_samba4_fetch: could not find own KRBTGT in DB!");
1080                         return HDB_ERR_NOENTRY;
1081                 } else if (lret != LDB_SUCCESS) {
1082                         krb5_warnx(context, "hdb_samba4_fetch: could not find own KRBTGT in DB: %s", ldb_errstring(db->hdb_db));
1083                         krb5_set_error_message(context, HDB_ERR_NOENTRY, "hdb_samba4_fetch: could not find own KRBTGT in DB: %s", ldb_errstring(db->hdb_db));
1084                         return HDB_ERR_NOENTRY;
1085                 }
1086
1087                 realm_fixed = strupper_talloc(mem_ctx, lp_realm(lp_ctx));
1088                 if (!realm_fixed) {
1089                         ret = ENOMEM;
1090                         krb5_set_error_message(context, ret, "strupper_talloc: out of memory");
1091                         return ret;
1092                 }
1093
1094                 ret = krb5_copy_principal(context, principal, &alloc_principal);
1095                 if (ret) {
1096                         return ret;
1097                 }
1098
1099                 free(alloc_principal->name.name_string.val[1]);
1100                 alloc_principal->name.name_string.val[1] = strdup(realm_fixed);
1101                 talloc_free(realm_fixed);
1102                 if (!alloc_principal->name.name_string.val[1]) {
1103                         ret = ENOMEM;
1104                         krb5_set_error_message(context, ret, "hdb_samba4_fetch: strdup() failed!");
1105                         return ret;
1106                 }
1107                 principal = alloc_principal;
1108
1109                 ret = hdb_samba4_message2entry(context, db, lp_ctx, mem_ctx,
1110                                         principal, HDB_SAMBA4_ENT_TYPE_KRBTGT,
1111                                         realm_dn, msg, entry_ex);
1112                 if (ret != 0) {
1113                         krb5_warnx(context, "hdb_samba4_fetch: self krbtgt message2entry failed");
1114                 }
1115                 return ret;
1116
1117         } else {
1118                 enum trust_direction direction = UNKNOWN;
1119
1120                 /* Either an inbound or outbound trust */
1121
1122                 if (strcasecmp(lp_realm(lp_ctx), principal->realm) == 0) {
1123                         /* look for inbound trust */
1124                         direction = INBOUND;
1125                         realm = principal->name.name_string.val[1];
1126                 }
1127
1128                 if (strcasecmp(lp_realm(lp_ctx), principal->name.name_string.val[1]) == 0) {
1129                         /* look for outbound trust */
1130                         direction = OUTBOUND;
1131                         realm = principal->realm;
1132                 }
1133
1134                 /* Trusted domains are under CN=system */
1135
1136                 ret = hdb_samba4_lookup_trust(context, (struct ldb_context *)db->hdb_db,
1137                                        mem_ctx,
1138                                        realm, realm_dn, &msg);
1139
1140                 if (ret != 0) {
1141                         krb5_warnx(context, "hdb_samba4_fetch: could not find principal in DB");
1142                         krb5_set_error_message(context, ret, "hdb_samba4_fetch: could not find principal in DB");
1143                         return ret;
1144                 }
1145
1146                 ret = hdb_samba4_trust_message2entry(context, db, lp_ctx, mem_ctx,
1147                                               principal, direction,
1148                                               realm_dn, msg, entry_ex);
1149                 if (ret != 0) {
1150                         krb5_warnx(context, "hdb_samba4_fetch: trust_message2entry failed");
1151                 }
1152                 return ret;
1153
1154
1155                 /* we should lookup trusted domains */
1156                 return HDB_ERR_NOENTRY;
1157         }
1158
1159 }
1160
1161 static krb5_error_code hdb_samba4_lookup_server(krb5_context context, HDB *db,
1162                                                 struct loadparm_context *lp_ctx,
1163                                                 TALLOC_CTX *mem_ctx,
1164                                                 krb5_const_principal principal,
1165                                                 const char **attrs,
1166                                                 struct ldb_dn **realm_dn,
1167                                                 struct ldb_message **msg)
1168 {
1169         krb5_error_code ret;
1170         const char *realm;
1171         if (principal->name.name_string.len >= 2) {
1172                 /* 'normal server' case */
1173                 int ldb_ret;
1174                 NTSTATUS nt_status;
1175                 struct ldb_dn *user_dn;
1176                 char *principal_string;
1177
1178                 ret = krb5_unparse_name_flags(context, principal,
1179                                               KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1180                                               &principal_string);
1181                 if (ret != 0) {
1182                         return ret;
1183                 }
1184
1185                 /* At this point we may find the host is known to be
1186                  * in a different realm, so we should generate a
1187                  * referral instead */
1188                 nt_status = crack_service_principal_name((struct ldb_context *)db->hdb_db,
1189                                                          mem_ctx, principal_string,
1190                                                          &user_dn, realm_dn);
1191                 free(principal_string);
1192
1193                 if (!NT_STATUS_IS_OK(nt_status)) {
1194                         return HDB_ERR_NOENTRY;
1195                 }
1196
1197                 ldb_ret = gendb_search_single_extended_dn((struct ldb_context *)db->hdb_db,
1198                                                           mem_ctx,
1199                                                           user_dn, LDB_SCOPE_BASE,
1200                                                           msg, attrs,
1201                                                           "(objectClass=*)");
1202                 if (ldb_ret != LDB_SUCCESS) {
1203                         return HDB_ERR_NOENTRY;
1204                 }
1205
1206         } else {
1207                 int lret;
1208                 char *filter = NULL;
1209                 char *short_princ;
1210                 /* server as client principal case, but we must not lookup userPrincipalNames */
1211                 *realm_dn = ldb_get_default_basedn(db->hdb_db);
1212                 realm = krb5_principal_get_realm(context, principal);
1213
1214                 /* TODO: Check if it is our realm, otherwise give referall */
1215
1216                 ret = krb5_unparse_name_flags(context, principal,  KRB5_PRINCIPAL_UNPARSE_NO_REALM, &short_princ);
1217
1218                 if (ret != 0) {
1219                         krb5_set_error_message(context, ret, "hdb_samba4_lookup_principal: could not parse principal");
1220                         krb5_warnx(context, "hdb_samba4_lookup_principal: could not parse principal");
1221                         return ret;
1222                 }
1223
1224                 lret = gendb_search_single_extended_dn(db->hdb_db, mem_ctx,
1225                                                        *realm_dn, LDB_SCOPE_SUBTREE,
1226                                                        msg, attrs, "(&(objectClass=user)(samAccountName=%s))",
1227                                                        ldb_binary_encode_string(mem_ctx, short_princ));
1228                 free(short_princ);
1229                 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1230                         DEBUG(3, ("Failed find a entry for %s\n", filter));
1231                         return HDB_ERR_NOENTRY;
1232                 }
1233                 if (lret != LDB_SUCCESS) {
1234                         DEBUG(3, ("Failed single search for for %s - %s\n",
1235                                   filter, ldb_errstring(db->hdb_db)));
1236                         return HDB_ERR_NOENTRY;
1237                 }
1238         }
1239
1240         return 0;
1241 }
1242
1243 static krb5_error_code hdb_samba4_fetch_server(krb5_context context, HDB *db,
1244                                                struct loadparm_context *lp_ctx,
1245                                                TALLOC_CTX *mem_ctx,
1246                                                krb5_const_principal principal,
1247                                                unsigned flags,
1248                                                hdb_entry_ex *entry_ex)
1249 {
1250         krb5_error_code ret;
1251         struct ldb_dn *realm_dn;
1252         struct ldb_message *msg;
1253
1254         ret = hdb_samba4_lookup_server(context, db, lp_ctx, mem_ctx, principal,
1255                                        server_attrs, &realm_dn, &msg);
1256         if (ret != 0) {
1257                 return ret;
1258         }
1259
1260         ret = hdb_samba4_message2entry(context, db, lp_ctx, mem_ctx,
1261                                 principal, HDB_SAMBA4_ENT_TYPE_SERVER,
1262                                 realm_dn, msg, entry_ex);
1263         if (ret != 0) {
1264                 krb5_warnx(context, "hdb_samba4_fetch: message2entry failed");
1265         }
1266
1267         return ret;
1268 }
1269
1270 static krb5_error_code hdb_samba4_fetch(krb5_context context, HDB *db,
1271                                  krb5_const_principal principal,
1272                                  unsigned flags,
1273                                  hdb_entry_ex *entry_ex)
1274 {
1275         krb5_error_code ret = HDB_ERR_NOENTRY;
1276         TALLOC_CTX *mem_ctx = talloc_named(db, 0, "hdb_samba4_fetch context");
1277         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(db->hdb_db, "loadparm"), struct loadparm_context);
1278
1279         if (!mem_ctx) {
1280                 ret = ENOMEM;
1281                 krb5_set_error_message(context, ret, "hdb_samba4_fetch: talloc_named() failed!");
1282                 return ret;
1283         }
1284
1285         if (flags & HDB_F_GET_CLIENT) {
1286                 ret = hdb_samba4_fetch_client(context, db, lp_ctx, mem_ctx, principal, flags, entry_ex);
1287                 if (ret != HDB_ERR_NOENTRY) goto done;
1288         }
1289         if (flags & HDB_F_GET_SERVER) {
1290                 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
1291                 ret = hdb_samba4_fetch_krbtgt(context, db, lp_ctx, mem_ctx, principal, flags, entry_ex);
1292                 if (ret != HDB_ERR_NOENTRY) goto done;
1293
1294                 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
1295                 ret = hdb_samba4_fetch_server(context, db, lp_ctx, mem_ctx, principal, flags, entry_ex);
1296                 if (ret != HDB_ERR_NOENTRY) goto done;
1297         }
1298         if (flags & HDB_F_GET_KRBTGT) {
1299                 ret = hdb_samba4_fetch_krbtgt(context, db, lp_ctx, mem_ctx, principal, flags, entry_ex);
1300                 if (ret != HDB_ERR_NOENTRY) goto done;
1301         }
1302
1303 done:
1304         talloc_free(mem_ctx);
1305         return ret;
1306 }
1307
1308 static krb5_error_code hdb_samba4_store(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
1309 {
1310         return HDB_ERR_DB_INUSE;
1311 }
1312
1313 static krb5_error_code hdb_samba4_remove(krb5_context context, HDB *db, krb5_const_principal principal)
1314 {
1315         return HDB_ERR_DB_INUSE;
1316 }
1317
1318 struct hdb_samba4_seq {
1319         struct ldb_context *ctx;
1320         struct loadparm_context *lp_ctx;
1321         int index;
1322         int count;
1323         struct ldb_message **msgs;
1324         struct ldb_dn *realm_dn;
1325 };
1326
1327 static krb5_error_code hdb_samba4_seq(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
1328 {
1329         krb5_error_code ret;
1330         struct hdb_samba4_seq *priv = (struct hdb_samba4_seq *)db->hdb_dbc;
1331         TALLOC_CTX *mem_ctx;
1332         hdb_entry_ex entry_ex;
1333         memset(&entry_ex, '\0', sizeof(entry_ex));
1334
1335         if (!priv) {
1336                 return HDB_ERR_NOENTRY;
1337         }
1338
1339         mem_ctx = talloc_named(priv, 0, "hdb_samba4_seq context");
1340
1341         if (!mem_ctx) {
1342                 ret = ENOMEM;
1343                 krb5_set_error_message(context, ret, "hdb_samba4_seq: talloc_named() failed!");
1344                 return ret;
1345         }
1346
1347         if (priv->index < priv->count) {
1348                 ret = hdb_samba4_message2entry(context, db, priv->lp_ctx,
1349                                         mem_ctx,
1350                                         NULL, HDB_SAMBA4_ENT_TYPE_ANY,
1351                                         priv->realm_dn, priv->msgs[priv->index++], entry);
1352         } else {
1353                 ret = HDB_ERR_NOENTRY;
1354         }
1355
1356         if (ret != 0) {
1357                 db->hdb_dbc = NULL;
1358         } else {
1359                 talloc_free(mem_ctx);
1360         }
1361
1362         return ret;
1363 }
1364
1365 static krb5_error_code hdb_samba4_firstkey(krb5_context context, HDB *db, unsigned flags,
1366                                         hdb_entry_ex *entry)
1367 {
1368         struct ldb_context *ldb_ctx = (struct ldb_context *)db->hdb_db;
1369         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb_ctx, "loadparm"),
1370                                                           struct loadparm_context);
1371         struct hdb_samba4_seq *priv = (struct hdb_samba4_seq *)db->hdb_dbc;
1372         char *realm;
1373         struct ldb_result *res = NULL;
1374         krb5_error_code ret;
1375         TALLOC_CTX *mem_ctx;
1376         int lret;
1377
1378         if (priv) {
1379                 talloc_free(priv);
1380                 db->hdb_dbc = NULL;
1381         }
1382
1383         priv = (struct hdb_samba4_seq *) talloc(db, struct hdb_samba4_seq);
1384         if (!priv) {
1385                 ret = ENOMEM;
1386                 krb5_set_error_message(context, ret, "talloc: out of memory");
1387                 return ret;
1388         }
1389
1390         priv->ctx = ldb_ctx;
1391         priv->lp_ctx = lp_ctx;
1392         priv->index = 0;
1393         priv->msgs = NULL;
1394         priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
1395         priv->count = 0;
1396
1397         mem_ctx = talloc_named(priv, 0, "hdb_samba4_firstkey context");
1398
1399         if (!mem_ctx) {
1400                 ret = ENOMEM;
1401                 krb5_set_error_message(context, ret, "hdb_samba4_firstkey: talloc_named() failed!");
1402                 return ret;
1403         }
1404
1405         ret = krb5_get_default_realm(context, &realm);
1406         if (ret != 0) {
1407                 talloc_free(priv);
1408                 return ret;
1409         }
1410
1411         lret = ldb_search(ldb_ctx, priv, &res,
1412                           priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
1413                           "(objectClass=user)");
1414
1415         if (lret != LDB_SUCCESS) {
1416                 talloc_free(priv);
1417                 return HDB_ERR_NOENTRY;
1418         }
1419
1420         priv->count = res->count;
1421         priv->msgs = talloc_steal(priv, res->msgs);
1422         talloc_free(res);
1423
1424         db->hdb_dbc = priv;
1425
1426         ret = hdb_samba4_seq(context, db, flags, entry);
1427
1428         if (ret != 0) {
1429                 talloc_free(priv);
1430                 db->hdb_dbc = NULL;
1431         } else {
1432                 talloc_free(mem_ctx);
1433         }
1434         return ret;
1435 }
1436
1437 static krb5_error_code hdb_samba4_nextkey(krb5_context context, HDB *db, unsigned flags,
1438                                    hdb_entry_ex *entry)
1439 {
1440         return hdb_samba4_seq(context, db, flags, entry);
1441 }
1442
1443 static krb5_error_code hdb_samba4_destroy(krb5_context context, HDB *db)
1444 {
1445         return 0;
1446 }
1447
1448
1449 /* Check if a given entry may delegate to this target principal
1450  *
1451  * This is currently a very nasty hack - allowing only delegation to itself.
1452  */
1453 krb5_error_code hdb_samba4_check_constrained_delegation(krb5_context context, HDB *db,
1454                                                         hdb_entry_ex *entry,
1455                                                         krb5_const_principal target_principal)
1456 {
1457         struct ldb_context *ldb_ctx = (struct ldb_context *)db->hdb_db;
1458         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb_ctx, "loadparm"),
1459                                                           struct loadparm_context);
1460         krb5_error_code ret;
1461         krb5_principal enterprise_prinicpal = NULL;
1462         struct ldb_dn *realm_dn;
1463         struct ldb_message *msg;
1464         struct dom_sid *orig_sid;
1465         struct dom_sid *target_sid;
1466         struct hdb_samba4_private *p = talloc_get_type(entry->ctx, struct hdb_samba4_private);
1467         const char *delegation_check_attrs[] = {
1468                 "objectSid", NULL
1469         };
1470
1471         TALLOC_CTX *mem_ctx = talloc_named(db, 0, "hdb_samba4_check_constrained_delegation");
1472
1473         if (!mem_ctx) {
1474                 ret = ENOMEM;
1475                 krb5_set_error_message(context, ret, "hdb_samba4_fetch: talloc_named() failed!");
1476                 return ret;
1477         }
1478
1479         if (target_principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1480                 /* Need to reparse the enterprise principal to find the real target */
1481                 if (target_principal->name.name_string.len != 1) {
1482                         ret = KRB5_PARSE_MALFORMED;
1483                         krb5_set_error_message(context, ret, "hdb_samba4_check_constrained_delegation: request for delegation to enterprise principal with wrong (%d) number of components",
1484                                                target_principal->name.name_string.len);
1485                         talloc_free(mem_ctx);
1486                         return ret;
1487                 }
1488                 ret = krb5_parse_name(context, target_principal->name.name_string.val[0],
1489                                       &enterprise_prinicpal);
1490                 if (ret) {
1491                         talloc_free(mem_ctx);
1492                         return ret;
1493                 }
1494                 target_principal = enterprise_prinicpal;
1495         }
1496
1497         ret = hdb_samba4_lookup_server(context, db, lp_ctx, mem_ctx, target_principal,
1498                                        delegation_check_attrs, &realm_dn, &msg);
1499
1500         krb5_free_principal(context, enterprise_prinicpal);
1501
1502         if (ret != 0) {
1503                 talloc_free(mem_ctx);
1504                 return ret;
1505         }
1506
1507         orig_sid = samdb_result_dom_sid(mem_ctx, p->msg, "objectSid");
1508         target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
1509
1510         /* Allow delegation to the same principal, even if by a different
1511          * name.  The easy and safe way to prove this is by SID
1512          * comparison */
1513         if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
1514                 talloc_free(mem_ctx);
1515                 return KRB5KDC_ERR_BADOPTION;
1516         }
1517
1518         talloc_free(mem_ctx);
1519         return ret;
1520 }
1521
1522 /* Certificates printed by a the Certificate Authority might have a
1523  * slightly different form of the user principal name to that in the
1524  * database.  Allow a mismatch where they both refer to the same
1525  * SID */
1526
1527 krb5_error_code hdb_samba4_check_pkinit_ms_upn_match(krb5_context context, HDB *db,
1528                                                      hdb_entry_ex *entry,
1529                                                      krb5_const_principal certificate_principal)
1530 {
1531         struct ldb_context *ldb_ctx = (struct ldb_context *)db->hdb_db;
1532         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb_ctx, "loadparm"),
1533                                                           struct loadparm_context);
1534         krb5_error_code ret;
1535         struct ldb_dn *realm_dn;
1536         struct ldb_message *msg;
1537         struct dom_sid *orig_sid;
1538         struct dom_sid *target_sid;
1539         struct hdb_samba4_private *p = talloc_get_type(entry->ctx, struct hdb_samba4_private);
1540         const char *ms_upn_check_attrs[] = {
1541                 "objectSid", NULL
1542         };
1543
1544         TALLOC_CTX *mem_ctx = talloc_named(db, 0, "hdb_samba4_check_constrained_delegation");
1545
1546         if (!mem_ctx) {
1547                 ret = ENOMEM;
1548                 krb5_set_error_message(context, ret, "hdb_samba4_fetch: talloc_named() failed!");
1549                 return ret;
1550         }
1551
1552         ret = hdb_samba4_lookup_client(context, db, lp_ctx,
1553                                        mem_ctx, certificate_principal,
1554                                        ms_upn_check_attrs, &realm_dn, &msg);
1555
1556         if (ret != 0) {
1557                 talloc_free(mem_ctx);
1558                 return ret;
1559         }
1560
1561         orig_sid = samdb_result_dom_sid(mem_ctx, p->msg, "objectSid");
1562         target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
1563
1564         /* Consider these to be the same principal, even if by a different
1565          * name.  The easy and safe way to prove this is by SID
1566          * comparison */
1567         if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
1568                 talloc_free(mem_ctx);
1569                 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1570         }
1571
1572         talloc_free(mem_ctx);
1573         return ret;
1574 }
1575
1576 /* This interface is to be called by the KDC and libnet_keytab_dump, which is expecting Samba
1577  * calling conventions.  It is also called by a wrapper
1578  * (hdb_samba4_create) from the kpasswdd -> krb5 -> keytab_hdb -> hdb
1579  * code */
1580
1581 NTSTATUS hdb_samba4_create_kdc(TALLOC_CTX *mem_ctx,
1582                               struct tevent_context *ev_ctx,
1583                               struct loadparm_context *lp_ctx,
1584                               krb5_context context, struct HDB **db)
1585 {
1586         NTSTATUS nt_status;
1587         struct auth_session_info *session_info;
1588         *db = talloc(mem_ctx, HDB);
1589         if (!*db) {
1590                 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
1591                 return NT_STATUS_NO_MEMORY;
1592         }
1593
1594         (*db)->hdb_master_key_set = 0;
1595         (*db)->hdb_db = NULL;
1596         (*db)->hdb_capability_flags = 0;
1597
1598         nt_status = auth_system_session_info(*db, lp_ctx, &session_info);
1599         if (!NT_STATUS_IS_OK(nt_status)) {
1600                 return nt_status;
1601         }
1602
1603         /* The idea here is very simple.  Using Kerberos to
1604          * authenticate the KDC to the LDAP server is higly likely to
1605          * be circular.
1606          *
1607          * In future we may set this up to use EXERNAL and SSL
1608          * certificates, for now it will almost certainly be NTLMSSP
1609         */
1610
1611         cli_credentials_set_kerberos_state(session_info->credentials,
1612                                            CRED_DONT_USE_KERBEROS);
1613
1614         /* Setup the link to LDB */
1615         (*db)->hdb_db = samdb_connect(*db, ev_ctx, lp_ctx, session_info);
1616         if ((*db)->hdb_db == NULL) {
1617                 DEBUG(1, ("hdb_samba4_create: Cannot open samdb for KDC backend!"));
1618                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1619         }
1620
1621         (*db)->hdb_dbc = NULL;
1622         (*db)->hdb_open = hdb_samba4_open;
1623         (*db)->hdb_close = hdb_samba4_close;
1624         (*db)->hdb_fetch = hdb_samba4_fetch;
1625         (*db)->hdb_store = hdb_samba4_store;
1626         (*db)->hdb_remove = hdb_samba4_remove;
1627         (*db)->hdb_firstkey = hdb_samba4_firstkey;
1628         (*db)->hdb_nextkey = hdb_samba4_nextkey;
1629         (*db)->hdb_lock = hdb_samba4_lock;
1630         (*db)->hdb_unlock = hdb_samba4_unlock;
1631         (*db)->hdb_rename = hdb_samba4_rename;
1632         /* we don't implement these, as we are not a lockable database */
1633         (*db)->hdb__get = NULL;
1634         (*db)->hdb__put = NULL;
1635         /* kadmin should not be used for deletes - use other tools instead */
1636         (*db)->hdb__del = NULL;
1637         (*db)->hdb_destroy = hdb_samba4_destroy;
1638
1639         (*db)->hdb_auth_status = NULL;
1640         (*db)->hdb_check_constrained_delegation = hdb_samba4_check_constrained_delegation;
1641         (*db)->hdb_check_pkinit_ms_upn_match = hdb_samba4_check_pkinit_ms_upn_match;
1642
1643         return NT_STATUS_OK;
1644 }
1645
1646 static krb5_error_code hdb_samba4_create(krb5_context context, struct HDB **db, const char *arg)
1647 {
1648         NTSTATUS nt_status;
1649         void *ptr;
1650         struct hdb_samba4_context *hdb_samba4_context;
1651         if (sscanf(arg, "&%p", &ptr) != 1) {
1652                 return EINVAL;
1653         }
1654         hdb_samba4_context = talloc_get_type_abort(ptr, struct hdb_samba4_context);
1655         /* The global kdc_mem_ctx and kdc_lp_ctx, Disgusting, ugly hack, but it means one less private hook */
1656         nt_status = hdb_samba4_create_kdc(hdb_samba4_context, hdb_samba4_context->ev_ctx, hdb_samba4_context->lp_ctx,
1657                                           context, db);
1658
1659         if (NT_STATUS_IS_OK(nt_status)) {
1660                 return 0;
1661         }
1662         return EINVAL;
1663 }
1664
1665 /* Only used in the hdb-backed keytab code
1666  * for a keytab of 'samba4&<address>', to find
1667  * kpasswd's key in the main DB, and to
1668  * copy all the keys into a file (libnet_keytab_export)
1669  *
1670  * The <address> is the string form of a pointer to a talloced struct hdb_samba_context
1671  */
1672 struct hdb_method hdb_samba4 = {
1673         .interface_version = HDB_INTERFACE_VERSION,
1674         .prefix = "samba4",
1675         .create = hdb_samba4_create
1676 };