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) {
 399                                 if (key.salt) {
 400                                         free_Salt(key.salt);
 401                                         free(key.salt);
 402                                         key.salt = NULL;
 403                                 }
 404                                 goto out;
 405                         }
 406
 407                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 408                         entry_ex->entry.keys.len++;
 409                 }
 410         } else if (pkb3) {
 411                 for (i=0; i < pkb3->num_keys; i++) {
 412                         bool use = true;
 413                         Key key;
 414
 415                         if (!pkb3->keys[i].value) continue;
 416
 417                         if (userAccountControl & UF_USE_DES_KEY_ONLY) {
 418                                 switch (pkb3->keys[i].keytype) {
 419                                 case ENCTYPE_DES_CBC_CRC:
 420                                 case ENCTYPE_DES_CBC_MD5:
 421                                         break;
 422                                 default:
 423                                         use = false;
 424                                         break;
 425                                 }
 426                         }
 427
 428                         if (!use) continue;
 429
 430                         key.mkvno = 0;
 431                         key.salt = NULL;
 432
 433                         if (pkb3->salt.string) {
 434                                 DATA_BLOB salt;
 435
 436                                 salt = data_blob_string_const(pkb3->salt.string);
 437
 438                                 key.salt = calloc(1, sizeof(*key.salt));
 439                                 if (key.salt == NULL) {
 440                                         ret = ENOMEM;
 441                                         goto out;
 442                                 }
 443
 444                                 key.salt->type = hdb_pw_salt;
 445
 446                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
 447                                 if (ret) {
 448                                         free(key.salt);
 449                                         key.salt = NULL;
 450                                         goto out;
 451                                 }
 452                         }
 453
 454                         ret = krb5_keyblock_init(context,
 455                                                  pkb3->keys[i].keytype,
 456                                                  pkb3->keys[i].value->data,
 457                                                  pkb3->keys[i].value->length,
 458                                                  &key.key);
 459                         if (ret) {
 460                                 if (key.salt) {
 461                                         free_Salt(key.salt);
 462                                         free(key.salt);
 463                                         key.salt = NULL;
 464                                 }
 465                                 goto out;
 466                         }
 467
 468                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 469                         entry_ex->entry.keys.len++;
 470                 }
 471         }
 472
 473 out:
 474         if (ret != 0) {
 475                 entry_ex->entry.keys.len = 0;
 476         }
 477         if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
 478                 free(entry_ex->entry.keys.val);
 479                 entry_ex->entry.keys.val = NULL;
 480         }
 481         return ret;
 482 }
 483
 484 /*
 485  * Construct an hdb_entry from a directory entry.
 486  */
 487 static krb5_error_code hdb_samba4_message2entry(krb5_context context, HDB *db,
 488                                          struct loadparm_context *lp_ctx,
 489                                          TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 490                                          enum hdb_samba4_ent_type ent_type,
 491                                          struct ldb_dn *realm_dn,
 492                                          struct ldb_message *msg,
 493                                          hdb_entry_ex *entry_ex)
 494 {
 495         unsigned int userAccountControl;
 496         int i;
 497         krb5_error_code ret = 0;
 498         krb5_boolean is_computer = FALSE;
 499         char *realm = strupper_talloc(mem_ctx, lp_realm(lp_ctx));
 500
 501         struct hdb_samba4_private *p;
 502         NTTIME acct_expiry;
 503         NTSTATUS status;
 504
 505         uint32_t rid;
 506         struct ldb_message_element *objectclasses;
 507         struct ldb_val computer_val;
 508         const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
 509         computer_val.data = discard_const_p(uint8_t,"computer");
 510         computer_val.length = strlen((const char *)computer_val.data);
 511
 512         if (!samAccountName) {
 513                 ret = ENOENT;
 514                 krb5_set_error_message(context, ret, "hdb_samba4_message2entry: no samAccountName present");
 515                 goto out;
 516         }
 517
 518         objectclasses = ldb_msg_find_element(msg, "objectClass");
 519
 520         if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
 521                 is_computer = TRUE;
 522         }
 523
 524         memset(entry_ex, 0, sizeof(*entry_ex));
 525
 526         if (!realm) {
 527                 ret = ENOMEM;
 528                 krb5_set_error_message(context, ret, "talloc_strdup: out of memory");
 529                 goto out;
 530         }
 531
 532         p = talloc(mem_ctx, struct hdb_samba4_private);
 533         if (!p) {
 534                 ret = ENOMEM;
 535                 goto out;
 536         }
 537
 538         p->entry_ex = entry_ex;
 539         p->iconv_convenience = lp_iconv_convenience(lp_ctx);
 540         p->lp_ctx = lp_ctx;
 541         p->realm_dn = talloc_reference(p, realm_dn);
 542         if (!p->realm_dn) {
 543                 ret = ENOMEM;
 544                 goto out;
 545         }
 546
 547         talloc_set_destructor(p, hdb_samba4_destructor);
 548
 549         entry_ex->ctx = p;
 550         entry_ex->free_entry = hdb_samba4_free_entry;
 551
 552         userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
 553
 554
 555         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 556         if (ent_type == HDB_SAMBA4_ENT_TYPE_ANY && principal == NULL) {
 557                 krb5_make_principal(context, &entry_ex->entry.principal, realm, samAccountName, NULL);
 558         } else {
 559                 ret = copy_Principal(principal, entry_ex->entry.principal);
 560                 if (ret) {
 561                         krb5_clear_error_message(context);
 562                         goto out;
 563                 }
 564
 565                 /* While we have copied the client principal, tests
 566                  * show that Win2k3 returns the 'corrected' realm, not
 567                  * the client-specified realm.  This code attempts to
 568                  * replace the client principal's realm with the one
 569                  * we determine from our records */
 570
 571                 /* this has to be with malloc() */
 572                 krb5_principal_set_realm(context, entry_ex->entry.principal, realm);
 573         }
 574
 575         /* First try and figure out the flags based on the userAccountControl */
 576         entry_ex->entry.flags = uf2HDBFlags(context, userAccountControl, ent_type);
 577
 578         /* Windows 2008 seems to enforce this (very sensible) rule by
 579          * default - don't allow offline attacks on a user's password
 580          * by asking for a ticket to them as a service (encrypted with
 581          * their probably patheticly insecure password) */
 582
 583         if (entry_ex->entry.flags.server
 584             && lp_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
 585                 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
 586                         entry_ex->entry.flags.server = 0;
 587                 }
 588         }
 589
 590         {
 591                 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
 592                  * of the Heimdal KDC.  They are stored in a the traditional
 593                  * DB for audit purposes, and still form part of the structure
 594                  * we must return */
 595
 596                 /* use 'whenCreated' */
 597                 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 598                 /* use '???' */
 599                 entry_ex->entry.created_by.principal = NULL;
 600
 601                 entry_ex->entry.modified_by = (Event *) malloc(sizeof(Event));
 602                 if (entry_ex->entry.modified_by == NULL) {
 603                         ret = ENOMEM;
 604                         krb5_set_error_message(context, ret, "malloc: out of memory");
 605                         goto out;
 606                 }
 607
 608                 /* use 'whenChanged' */
 609                 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
 610                 /* use '???' */
 611                 entry_ex->entry.modified_by->principal = NULL;
 612         }
 613
 614
 615         /* The lack of password controls etc applies to krbtgt by
 616          * virtue of being that particular RID */
 617         status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
 618
 619         if (!NT_STATUS_IS_OK(status)) {
 620                 ret = EINVAL;
 621                 goto out;
 622         }
 623
 624         if (rid == DOMAIN_RID_KRBTGT) {
 625                 entry_ex->entry.valid_end = NULL;
 626                 entry_ex->entry.pw_end = NULL;
 627
 628                 entry_ex->entry.flags.invalid = 0;
 629                 entry_ex->entry.flags.server = 1;
 630
 631                 /* Don't mark all requests for the krbtgt/realm as
 632                  * 'change password', as otherwise we could get into
 633                  * trouble, and not enforce the password expirty.
 634                  * Instead, only do it when request is for the kpasswd service */
 635                 if (ent_type == HDB_SAMBA4_ENT_TYPE_SERVER
 636                     && principal->name.name_string.len == 2
 637                     && (strcmp(principal->name.name_string.val[0], "kadmin") == 0)
 638                     && (strcmp(principal->name.name_string.val[1], "changepw") == 0)
 639                     && lp_is_my_domain_or_realm(lp_ctx, principal->realm)) {
 640                         entry_ex->entry.flags.change_pw = 1;
 641                 }
 642                 entry_ex->entry.flags.client = 0;
 643                 entry_ex->entry.flags.forwardable = 1;
 644                 entry_ex->entry.flags.ok_as_delegate = 1;
 645         } else if (entry_ex->entry.flags.server && ent_type == HDB_SAMBA4_ENT_TYPE_SERVER) {
 646                 /* The account/password expiry only applies when the account is used as a
 647                  * client (ie password login), not when used as a server */
 648
 649                 /* Make very well sure we don't use this for a client,
 650                  * it could bypass the password restrictions */
 651                 entry_ex->entry.flags.client = 0;
 652
 653                 entry_ex->entry.valid_end = NULL;
 654                 entry_ex->entry.pw_end = NULL;
 655
 656         } else {
 657                 NTTIME must_change_time
 658                         = samdb_result_force_password_change((struct ldb_context *)db->hdb_db, mem_ctx,
 659                                                              realm_dn, msg);
 660                 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
 661                         entry_ex->entry.pw_end = NULL;
 662                 } else {
 663                         entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
 664                         if (entry_ex->entry.pw_end == NULL) {
 665                                 ret = ENOMEM;
 666                                 goto out;
 667                         }
 668                         *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
 669                 }
 670
 671                 acct_expiry = samdb_result_account_expires(msg);
 672                 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
 673                         entry_ex->entry.valid_end = NULL;
 674                 } else {
 675                         entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
 676                         if (entry_ex->entry.valid_end == NULL) {
 677                                 ret = ENOMEM;
 678                                 goto out;
 679                         }
 680                         *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
 681                 }
 682         }
 683
 684         entry_ex->entry.valid_start = NULL;
 685
 686         entry_ex->entry.max_life = NULL;
 687
 688         entry_ex->entry.max_renew = NULL;
 689
 690         entry_ex->entry.generation = NULL;
 691
 692         /* Get keys from the db */
 693         ret = hdb_samba4_message2entry_keys(context, p->iconv_convenience, p, msg, userAccountControl, entry_ex);
 694         if (ret) {
 695                 /* Could be bougus data in the entry, or out of memory */
 696                 goto out;
 697         }
 698
 699         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 700         if (entry_ex->entry.etypes == NULL) {
 701                 krb5_clear_error_message(context);
 702                 ret = ENOMEM;
 703                 goto out;
 704         }
 705         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 706         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 707         if (entry_ex->entry.etypes->val == NULL) {
 708                 krb5_clear_error_message(context);
 709                 ret = ENOMEM;
 710                 goto out;
 711         }
 712         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 713                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 714         }
 715
 716
 717         p->msg = talloc_steal(p, msg);
 718         p->samdb = (struct ldb_context *)db->hdb_db;
 719
 720 out:
 721         if (ret != 0) {
 722                 /* This doesn't free ent itself, that is for the eventual caller to do */
 723                 hdb_free_entry(context, entry_ex);
 724         } else {
 725                 talloc_steal(db, entry_ex->ctx);
 726         }
 727
 728         return ret;
 729 }
 730
 731 /*
 732  * Construct an hdb_entry from a directory entry.
 733  */
 734 static krb5_error_code hdb_samba4_trust_message2entry(krb5_context context, HDB *db,
 735                                                struct loadparm_context *lp_ctx,
 736                                                TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 737                                                enum trust_direction direction,
 738                                                struct ldb_dn *realm_dn,
 739                                                struct ldb_message *msg,
 740                                                hdb_entry_ex *entry_ex)
 741 {
 742
 743         const char *dnsdomain;
 744         char *realm;
 745         DATA_BLOB password_utf16;
 746         struct samr_Password password_hash;
 747         const struct ldb_val *password_val;
 748         struct trustAuthInOutBlob password_blob;
 749         struct hdb_samba4_private *p;
 750
 751         enum ndr_err_code ndr_err;
 752         int i, ret, trust_direction_flags;
 753
 754         p = talloc(mem_ctx, struct hdb_samba4_private);
 755         if (!p) {
 756                 ret = ENOMEM;
 757                 goto out;
 758         }
 759
 760         p->entry_ex = entry_ex;
 761         p->iconv_convenience = lp_iconv_convenience(lp_ctx);
 762         p->lp_ctx = lp_ctx;
 763         p->realm_dn = realm_dn;
 764
 765         talloc_set_destructor(p, hdb_samba4_destructor);
 766
 767         entry_ex->ctx = p;
 768         entry_ex->free_entry = hdb_samba4_free_entry;
 769
 770         /* use 'whenCreated' */
 771         entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 772         /* use '???' */
 773         entry_ex->entry.created_by.principal = NULL;
 774
 775         entry_ex->entry.valid_start = NULL;
 776
 777         trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
 778
 779         if (direction == INBOUND) {
 780                 realm = strupper_talloc(mem_ctx, lp_realm(lp_ctx));
 781                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
 782
 783         } else { /* OUTBOUND */
 784                 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
 785                 realm = strupper_talloc(mem_ctx, dnsdomain);
 786                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
 787         }
 788
 789         if (!password_val || !(trust_direction_flags & direction)) {
 790                 ret = ENOENT;
 791                 goto out;
 792         }
 793
 794         ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, p->iconv_convenience, &password_blob,
 795                                            (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
 796         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 797                 ret = EINVAL;
 798                 goto out;
 799         }
 800
 801         entry_ex->entry.kvno = -1;
 802         for (i=0; i < password_blob.count; i++) {
 803                 if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_VERSION) {
 804                         entry_ex->entry.kvno = password_blob.current->array[i].AuthInfo.version.version;
 805                 }
 806         }
 807
 808         for (i=0; i < password_blob.count; i++) {
 809                 if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
 810                         password_utf16 = data_blob_const(password_blob.current->array[i].AuthInfo.clear.password,
 811                                                          password_blob.current->array[i].AuthInfo.clear.size);
 812                         /* In the future, generate all sorts of
 813                          * hashes, but for now we can't safely convert
 814                          * the random strings windows uses into
 815                          * utf8 */
 816
 817                         /* but as it is utf16 already, we can get the NT password/arcfour-hmac-md5 key */
 818                         mdfour(password_hash.hash, password_utf16.data, password_utf16.length);
 819                         break;
 820                 } else if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
 821                         password_hash = password_blob.current->array[i].AuthInfo.nt4owf.password;
 822                         break;
 823                 }
 824         }
 825         entry_ex->entry.keys.len = 0;
 826         entry_ex->entry.keys.val = NULL;
 827
 828         if (i < password_blob.count) {
 829                 Key key;
 830                 /* Must have found a cleartext or MD4 password */
 831                 entry_ex->entry.keys.val = calloc(1, sizeof(Key));
 832
 833                 key.mkvno = 0;
 834                 key.salt = NULL; /* No salt for this enc type */
 835
 836                 if (entry_ex->entry.keys.val == NULL) {
 837                         ret = ENOMEM;
 838                         goto out;
 839                 }
 840
 841                 ret = krb5_keyblock_init(context,
 842                                          ENCTYPE_ARCFOUR_HMAC,
 843                                          password_hash.hash, sizeof(password_hash.hash),
 844                                          &key.key);
 845
 846                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 847                 entry_ex->entry.keys.len++;
 848         }
 849
 850         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 851
 852         ret = copy_Principal(principal, entry_ex->entry.principal);
 853         if (ret) {
 854                 krb5_clear_error_message(context);
 855                 goto out;
 856         }
 857
 858         /* While we have copied the client principal, tests
 859          * show that Win2k3 returns the 'corrected' realm, not
 860          * the client-specified realm.  This code attempts to
 861          * replace the client principal's realm with the one
 862          * we determine from our records */
 863
 864         krb5_principal_set_realm(context, entry_ex->entry.principal, realm);
 865         entry_ex->entry.flags = int2HDBFlags(0);
 866         entry_ex->entry.flags.immutable = 1;
 867         entry_ex->entry.flags.invalid = 0;
 868         entry_ex->entry.flags.server = 1;
 869         entry_ex->entry.flags.require_preauth = 1;
 870
 871         entry_ex->entry.pw_end = NULL;
 872
 873         entry_ex->entry.max_life = NULL;
 874
 875         entry_ex->entry.max_renew = NULL;
 876
 877         entry_ex->entry.generation = NULL;
 878
 879         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 880         if (entry_ex->entry.etypes == NULL) {
 881                 krb5_clear_error_message(context);
 882                 ret = ENOMEM;
 883                 goto out;
 884         }
 885         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 886         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 887         if (entry_ex->entry.etypes->val == NULL) {
 888                 krb5_clear_error_message(context);
 889                 ret = ENOMEM;
 890                 goto out;
 891         }
 892         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 893                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 894         }
 895
 896
 897         p->msg = talloc_steal(p, msg);
 898         p->samdb = (struct ldb_context *)db->hdb_db;
 899
 900 out:
 901         if (ret != 0) {
 902                 /* This doesn't free ent itself, that is for the eventual caller to do */
 903                 hdb_free_entry(context, entry_ex);
 904         } else {
 905                 talloc_steal(db, entry_ex->ctx);
 906         }
 907
 908         return ret;
 909
 910 }
 911
 912 static krb5_error_code hdb_samba4_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
 913                                         TALLOC_CTX *mem_ctx,
 914                                         const char *realm,
 915                                         struct ldb_dn *realm_dn,
 916                                         struct ldb_message **pmsg)
 917 {
 918         int lret;
 919         krb5_error_code ret;
 920         char *filter = NULL;
 921         const char * const *attrs = trust_attrs;
 922
 923         struct ldb_result *res = NULL;
 924         filter = talloc_asprintf(mem_ctx, "(&(objectClass=trustedDomain)(|(flatname=%s)(trustPartner=%s)))", realm, realm);
 925
 926         if (!filter) {
 927                 ret = ENOMEM;
 928                 krb5_set_error_message(context, ret, "talloc_asprintf: out of memory");
 929                 return ret;
 930         }
 931
 932         lret = ldb_search(ldb_ctx, mem_ctx, &res,
 933                           ldb_get_default_basedn(ldb_ctx),
 934                           LDB_SCOPE_SUBTREE, attrs, "%s", filter);
 935         if (lret != LDB_SUCCESS) {
 936                 DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx)));
 937                 return HDB_ERR_NOENTRY;
 938         } else if (res->count == 0 || res->count > 1) {
 939                 DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count));
 940                 talloc_free(res);
 941                 return HDB_ERR_NOENTRY;
 942         }
 943         talloc_steal(mem_ctx, res->msgs);
 944         *pmsg = res->msgs[0];
 945         talloc_free(res);
 946         return 0;
 947 }
 948
 949 static krb5_error_code hdb_samba4_open(krb5_context context, HDB *db, int flags, mode_t mode)
 950 {
 951         if (db->hdb_master_key_set) {
 952                 krb5_error_code ret = HDB_ERR_NOENTRY;
 953                 krb5_warnx(context, "hdb_samba4_open: use of a master key incompatible with LDB\n");
 954                 krb5_set_error_message(context, ret, "hdb_samba4_open: use of a master key incompatible with LDB\n");
 955                 return ret;
 956         }
 957
 958         return 0;
 959 }
 960
 961 static krb5_error_code hdb_samba4_close(krb5_context context, HDB *db)
 962 {
 963         return 0;
 964 }
 965
 966 static krb5_error_code hdb_samba4_lock(krb5_context context, HDB *db, int operation)
 967 {
 968         return 0;
 969 }
 970
 971 static krb5_error_code hdb_samba4_unlock(krb5_context context, HDB *db)
 972 {
 973         return 0;
 974 }
 975
 976 static krb5_error_code hdb_samba4_rename(krb5_context context, HDB *db, const char *new_name)
 977 {
 978         return HDB_ERR_DB_INUSE;
 979 }
 980
 981 static krb5_error_code hdb_samba4_lookup_client(krb5_context context, HDB *db,
 982                                                 struct loadparm_context *lp_ctx,
 983                                                 TALLOC_CTX *mem_ctx,
 984                                                 krb5_const_principal principal,
 985                                                 const char **attrs,
 986                                                 struct ldb_dn **realm_dn,
 987                                                 struct ldb_message **msg) {
 988         NTSTATUS nt_status;
 989         char *principal_string;
 990         krb5_error_code ret;
 991
 992         ret = krb5_unparse_name(context, principal, &principal_string);
 993
 994         if (ret != 0) {
 995                 return ret;
 996         }
 997
 998         nt_status = sam_get_results_principal((struct ldb_context *)db->hdb_db,
 999                                               mem_ctx, principal_string, attrs,
1000                                               realm_dn, msg);
1001         free(principal_string);
1002         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1003                 return HDB_ERR_NOENTRY;
1004         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1005                 return ENOMEM;
1006         } else if (!NT_STATUS_IS_OK(nt_status)) {
1007                 return EINVAL;
1008         }
1009
1010         return ret;
1011 }
1012
1013 static krb5_error_code hdb_samba4_fetch_client(krb5_context context, HDB *db,
1014                                                struct loadparm_context *lp_ctx,
1015                                                TALLOC_CTX *mem_ctx,
1016                                                krb5_const_principal principal,
1017                                                unsigned flags,
1018                                                hdb_entry_ex *entry_ex) {
1019         struct ldb_dn *realm_dn;
1020         krb5_error_code ret;
1021         struct ldb_message *msg = NULL;
1022
1023         ret = hdb_samba4_lookup_client(context, db, lp_ctx,
1024                                        mem_ctx, principal, user_attrs,
1025                                        &realm_dn, &msg);
1026         if (ret != 0) {
1027                 return ret;
1028         }
1029
1030         ret = hdb_samba4_message2entry(context, db, lp_ctx, mem_ctx,
1031                                        principal, HDB_SAMBA4_ENT_TYPE_CLIENT,
1032                                        realm_dn, msg, entry_ex);
1033         return ret;
1034 }
1035
1036 static krb5_error_code hdb_samba4_fetch_krbtgt(krb5_context context, HDB *db,
1037                                         struct loadparm_context *lp_ctx,
1038                                         TALLOC_CTX *mem_ctx,
1039                                         krb5_const_principal principal,
1040                                         unsigned flags,
1041                                         hdb_entry_ex *entry_ex)
1042 {
1043         krb5_error_code ret;
1044         struct ldb_message *msg = NULL;
1045         struct ldb_dn *realm_dn = ldb_get_default_basedn(db->hdb_db);
1046         const char *realm;
1047
1048         krb5_principal alloc_principal = NULL;
1049         if (principal->name.name_string.len != 2
1050             || (strcmp(principal->name.name_string.val[0], KRB5_TGS_NAME) != 0)) {
1051                 /* Not a krbtgt */
1052                 return HDB_ERR_NOENTRY;
1053         }
1054
1055         /* krbtgt case.  Either us or a trusted realm */
1056
1057         if (lp_is_my_domain_or_realm(lp_ctx, principal->realm)
1058             && lp_is_my_domain_or_realm(lp_ctx, principal->name.name_string.val[1])) {
1059                 /* us */
1060                 /* Cludge, cludge cludge.  If the realm part of krbtgt/realm,
1061                  * is in our db, then direct the caller at our primary
1062                  * krbtgt */
1063
1064                 int lret;
1065                 char *realm_fixed;
1066
1067                 lret = gendb_search_single_extended_dn(db->hdb_db, mem_ctx,
1068                                                        realm_dn, LDB_SCOPE_SUBTREE,
1069                                                        &msg, krbtgt_attrs,
1070                                                        "(&(objectClass=user)(samAccountName=krbtgt))");
1071                 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1072                         krb5_warnx(context, "hdb_samba4_fetch: could not find own KRBTGT in DB!");
1073                         krb5_set_error_message(context, HDB_ERR_NOENTRY, "hdb_samba4_fetch: could not find own KRBTGT in DB!");
1074                         return HDB_ERR_NOENTRY;
1075                 } else if (lret != LDB_SUCCESS) {
1076                         krb5_warnx(context, "hdb_samba4_fetch: could not find own KRBTGT in DB: %s", ldb_errstring(db->hdb_db));
1077                         krb5_set_error_message(context, HDB_ERR_NOENTRY, "hdb_samba4_fetch: could not find own KRBTGT in DB: %s", ldb_errstring(db->hdb_db));
1078                         return HDB_ERR_NOENTRY;
1079                 }
1080
1081                 realm_fixed = strupper_talloc(mem_ctx, lp_realm(lp_ctx));
1082                 if (!realm_fixed) {
1083                         ret = ENOMEM;
1084                         krb5_set_error_message(context, ret, "strupper_talloc: out of memory");
1085                         return ret;
1086                 }
1087
1088                 ret = krb5_copy_principal(context, principal, &alloc_principal);
1089                 if (ret) {
1090                         return ret;
1091                 }
1092
1093                 free(alloc_principal->name.name_string.val[1]);
1094                 alloc_principal->name.name_string.val[1] = strdup(realm_fixed);
1095                 talloc_free(realm_fixed);
1096                 if (!alloc_principal->name.name_string.val[1]) {
1097                         ret = ENOMEM;
1098                         krb5_set_error_message(context, ret, "hdb_samba4_fetch: strdup() failed!");
1099                         return ret;
1100                 }
1101                 principal = alloc_principal;
1102
1103                 ret = hdb_samba4_message2entry(context, db, lp_ctx, mem_ctx,
1104                                         principal, HDB_SAMBA4_ENT_TYPE_KRBTGT,
1105                                         realm_dn, msg, entry_ex);
1106                 if (ret != 0) {
1107                         krb5_warnx(context, "hdb_samba4_fetch: self krbtgt message2entry failed");
1108                 }
1109                 return ret;
1110
1111         } else {
1112                 enum trust_direction direction = UNKNOWN;
1113
1114                 /* Either an inbound or outbound trust */
1115
1116                 if (strcasecmp(lp_realm(lp_ctx), principal->realm) == 0) {
1117                         /* look for inbound trust */
1118                         direction = INBOUND;
1119                         realm = principal->name.name_string.val[1];
1120                 }
1121
1122                 if (strcasecmp(lp_realm(lp_ctx), principal->name.name_string.val[1]) == 0) {
1123                         /* look for outbound trust */
1124                         direction = OUTBOUND;
1125                         realm = principal->realm;
1126                 }
1127
1128                 /* Trusted domains are under CN=system */
1129
1130                 ret = hdb_samba4_lookup_trust(context, (struct ldb_context *)db->hdb_db,
1131                                        mem_ctx,
1132                                        realm, realm_dn, &msg);
1133
1134                 if (ret != 0) {
1135                         krb5_warnx(context, "hdb_samba4_fetch: could not find principal in DB");
1136                         krb5_set_error_message(context, ret, "hdb_samba4_fetch: could not find principal in DB");
1137                         return ret;
1138                 }
1139
1140                 ret = hdb_samba4_trust_message2entry(context, db, lp_ctx, mem_ctx,
1141                                               principal, direction,
1142                                               realm_dn, msg, entry_ex);
1143                 if (ret != 0) {
1144                         krb5_warnx(context, "hdb_samba4_fetch: trust_message2entry failed");
1145                 }
1146                 return ret;
1147
1148
1149                 /* we should lookup trusted domains */
1150                 return HDB_ERR_NOENTRY;
1151         }
1152
1153 }
1154
1155 static krb5_error_code hdb_samba4_lookup_server(krb5_context context, HDB *db,
1156                                                 struct loadparm_context *lp_ctx,
1157                                                 TALLOC_CTX *mem_ctx,
1158                                                 krb5_const_principal principal,
1159                                                 const char **attrs,
1160                                                 struct ldb_dn **realm_dn,
1161                                                 struct ldb_message **msg)
1162 {
1163         krb5_error_code ret;
1164         const char *realm;
1165         if (principal->name.name_string.len >= 2) {
1166                 /* 'normal server' case */
1167                 int ldb_ret;
1168                 NTSTATUS nt_status;
1169                 struct ldb_dn *user_dn;
1170                 char *principal_string;
1171
1172                 ret = krb5_unparse_name_flags(context, principal,
1173                                               KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1174                                               &principal_string);
1175                 if (ret != 0) {
1176                         return ret;
1177                 }
1178
1179                 /* At this point we may find the host is known to be
1180                  * in a different realm, so we should generate a
1181                  * referral instead */
1182                 nt_status = crack_service_principal_name((struct ldb_context *)db->hdb_db,
1183                                                          mem_ctx, principal_string,
1184                                                          &user_dn, realm_dn);
1185                 free(principal_string);
1186
1187                 if (!NT_STATUS_IS_OK(nt_status)) {
1188                         return HDB_ERR_NOENTRY;
1189                 }
1190
1191                 ldb_ret = gendb_search_single_extended_dn((struct ldb_context *)db->hdb_db,
1192                                                           mem_ctx,
1193                                                           user_dn, LDB_SCOPE_BASE,
1194                                                           msg, attrs,
1195                                                           "(objectClass=*)");
1196                 if (ldb_ret != LDB_SUCCESS) {
1197                         return HDB_ERR_NOENTRY;
1198                 }
1199
1200         } else {
1201                 int lret;
1202                 char *filter = NULL;
1203                 char *short_princ;
1204                 /* server as client principal case, but we must not lookup userPrincipalNames */
1205                 *realm_dn = ldb_get_default_basedn(db->hdb_db);
1206                 realm = krb5_principal_get_realm(context, principal);
1207
1208                 /* TODO: Check if it is our realm, otherwise give referall */
1209
1210                 ret = krb5_unparse_name_flags(context, principal,  KRB5_PRINCIPAL_UNPARSE_NO_REALM, &short_princ);
1211
1212                 if (ret != 0) {
1213                         krb5_set_error_message(context, ret, "hdb_samba4_lookup_principal: could not parse principal");
1214                         krb5_warnx(context, "hdb_samba4_lookup_principal: could not parse principal");
1215                         return ret;
1216                 }
1217
1218                 lret = gendb_search_single_extended_dn(db->hdb_db, mem_ctx,
1219                                                        *realm_dn, LDB_SCOPE_SUBTREE,
1220                                                        msg, attrs, "(&(objectClass=user)(samAccountName=%s))",
1221                                                        ldb_binary_encode_string(mem_ctx, short_princ));
1222                 free(short_princ);
1223                 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1224                         DEBUG(3, ("Failed find a entry for %s\n", filter));
1225                         return HDB_ERR_NOENTRY;
1226                 }
1227                 if (lret != LDB_SUCCESS) {
1228                         DEBUG(3, ("Failed single search for for %s - %s\n",
1229                                   filter, ldb_errstring(db->hdb_db)));
1230                         return HDB_ERR_NOENTRY;
1231                 }
1232         }
1233
1234         return 0;
1235 }
1236
1237 static krb5_error_code hdb_samba4_fetch_server(krb5_context context, HDB *db,
1238                                                struct loadparm_context *lp_ctx,
1239                                                TALLOC_CTX *mem_ctx,
1240                                                krb5_const_principal principal,
1241                                                unsigned flags,
1242                                                hdb_entry_ex *entry_ex)
1243 {
1244         krb5_error_code ret;
1245         struct ldb_dn *realm_dn;
1246         struct ldb_message *msg;
1247
1248         ret = hdb_samba4_lookup_server(context, db, lp_ctx, mem_ctx, principal,
1249                                        server_attrs, &realm_dn, &msg);
1250         if (ret != 0) {
1251                 return ret;
1252         }
1253
1254         ret = hdb_samba4_message2entry(context, db, lp_ctx, mem_ctx,
1255                                 principal, HDB_SAMBA4_ENT_TYPE_SERVER,
1256                                 realm_dn, msg, entry_ex);
1257         if (ret != 0) {
1258                 krb5_warnx(context, "hdb_samba4_fetch: message2entry failed");
1259         }
1260
1261         return ret;
1262 }
1263
1264 static krb5_error_code hdb_samba4_fetch(krb5_context context, HDB *db,
1265                                  krb5_const_principal principal,
1266                                  unsigned flags,
1267                                  hdb_entry_ex *entry_ex)
1268 {
1269         krb5_error_code ret = HDB_ERR_NOENTRY;
1270         TALLOC_CTX *mem_ctx = talloc_named(db, 0, "hdb_samba4_fetch context");
1271         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(db->hdb_db, "loadparm"), struct loadparm_context);
1272
1273         if (!mem_ctx) {
1274                 ret = ENOMEM;
1275                 krb5_set_error_message(context, ret, "hdb_samba4_fetch: talloc_named() failed!");
1276                 return ret;
1277         }
1278
1279         if (flags & HDB_F_GET_CLIENT) {
1280                 ret = hdb_samba4_fetch_client(context, db, lp_ctx, mem_ctx, principal, flags, entry_ex);
1281                 if (ret != HDB_ERR_NOENTRY) goto done;
1282         }
1283         if (flags & HDB_F_GET_SERVER) {
1284                 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
1285                 ret = hdb_samba4_fetch_krbtgt(context, db, lp_ctx, mem_ctx, principal, flags, entry_ex);
1286                 if (ret != HDB_ERR_NOENTRY) goto done;
1287
1288                 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
1289                 ret = hdb_samba4_fetch_server(context, db, lp_ctx, mem_ctx, principal, flags, entry_ex);
1290                 if (ret != HDB_ERR_NOENTRY) goto done;
1291         }
1292         if (flags & HDB_F_GET_KRBTGT) {
1293                 ret = hdb_samba4_fetch_krbtgt(context, db, lp_ctx, mem_ctx, principal, flags, entry_ex);
1294                 if (ret != HDB_ERR_NOENTRY) goto done;
1295         }
1296
1297 done:
1298         talloc_free(mem_ctx);
1299         return ret;
1300 }
1301
1302 static krb5_error_code hdb_samba4_store(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
1303 {
1304         return HDB_ERR_DB_INUSE;
1305 }
1306
1307 static krb5_error_code hdb_samba4_remove(krb5_context context, HDB *db, krb5_const_principal principal)
1308 {
1309         return HDB_ERR_DB_INUSE;
1310 }
1311
1312 struct hdb_samba4_seq {
1313         struct ldb_context *ctx;
1314         struct loadparm_context *lp_ctx;
1315         int index;
1316         int count;
1317         struct ldb_message **msgs;
1318         struct ldb_dn *realm_dn;
1319 };
1320
1321 static krb5_error_code hdb_samba4_seq(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
1322 {
1323         krb5_error_code ret;
1324         struct hdb_samba4_seq *priv = (struct hdb_samba4_seq *)db->hdb_dbc;
1325         TALLOC_CTX *mem_ctx;
1326         hdb_entry_ex entry_ex;
1327         memset(&entry_ex, '\0', sizeof(entry_ex));
1328
1329         if (!priv) {
1330                 return HDB_ERR_NOENTRY;
1331         }
1332
1333         mem_ctx = talloc_named(priv, 0, "hdb_samba4_seq context");
1334
1335         if (!mem_ctx) {
1336                 ret = ENOMEM;
1337                 krb5_set_error_message(context, ret, "hdb_samba4_seq: talloc_named() failed!");
1338                 return ret;
1339         }
1340
1341         if (priv->index < priv->count) {
1342                 ret = hdb_samba4_message2entry(context, db, priv->lp_ctx,
1343                                         mem_ctx,
1344                                         NULL, HDB_SAMBA4_ENT_TYPE_ANY,
1345                                         priv->realm_dn, priv->msgs[priv->index++], entry);
1346         } else {
1347                 ret = HDB_ERR_NOENTRY;
1348         }
1349
1350         if (ret != 0) {
1351                 talloc_free(priv);
1352                 db->hdb_dbc = NULL;
1353         } else {
1354                 talloc_free(mem_ctx);
1355         }
1356
1357         return ret;
1358 }
1359
1360 static krb5_error_code hdb_samba4_firstkey(krb5_context context, HDB *db, unsigned flags,
1361                                         hdb_entry_ex *entry)
1362 {
1363         struct ldb_context *ldb_ctx = (struct ldb_context *)db->hdb_db;
1364         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb_ctx, "loadparm"),
1365                                                           struct loadparm_context);
1366         struct hdb_samba4_seq *priv = (struct hdb_samba4_seq *)db->hdb_dbc;
1367         char *realm;
1368         struct ldb_result *res = NULL;
1369         krb5_error_code ret;
1370         TALLOC_CTX *mem_ctx;
1371         int lret;
1372
1373         if (priv) {
1374                 talloc_free(priv);
1375                 db->hdb_dbc = NULL;
1376         }
1377
1378         priv = (struct hdb_samba4_seq *) talloc(db, struct hdb_samba4_seq);
1379         if (!priv) {
1380                 ret = ENOMEM;
1381                 krb5_set_error_message(context, ret, "talloc: out of memory");
1382                 return ret;
1383         }
1384
1385         priv->ctx = ldb_ctx;
1386         priv->lp_ctx = lp_ctx;
1387         priv->index = 0;
1388         priv->msgs = NULL;
1389         priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
1390         priv->count = 0;
1391
1392         mem_ctx = talloc_named(priv, 0, "hdb_samba4_firstkey context");
1393
1394         if (!mem_ctx) {
1395                 ret = ENOMEM;
1396                 krb5_set_error_message(context, ret, "hdb_samba4_firstkey: talloc_named() failed!");
1397                 return ret;
1398         }
1399
1400         ret = krb5_get_default_realm(context, &realm);
1401         if (ret != 0) {
1402                 talloc_free(priv);
1403                 return ret;
1404         }
1405
1406         lret = ldb_search(ldb_ctx, priv, &res,
1407                           priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
1408                           "(objectClass=user)");
1409
1410         if (lret != LDB_SUCCESS) {
1411                 talloc_free(priv);
1412                 return HDB_ERR_NOENTRY;
1413         }
1414
1415         priv->count = res->count;
1416         priv->msgs = talloc_steal(priv, res->msgs);
1417         talloc_free(res);
1418
1419         db->hdb_dbc = priv;
1420
1421         ret = hdb_samba4_seq(context, db, flags, entry);
1422
1423         if (ret != 0) {
1424                 talloc_free(priv);
1425                 db->hdb_dbc = NULL;
1426         } else {
1427                 talloc_free(mem_ctx);
1428         }
1429         return ret;
1430 }
1431
1432 static krb5_error_code hdb_samba4_nextkey(krb5_context context, HDB *db, unsigned flags,
1433                                    hdb_entry_ex *entry)
1434 {
1435         return hdb_samba4_seq(context, db, flags, entry);
1436 }
1437
1438 static krb5_error_code hdb_samba4_destroy(krb5_context context, HDB *db)
1439 {
1440         talloc_free(db);
1441         return 0;
1442 }
1443
1444
1445 /* Check if a given entry may delegate to this target principal
1446  *
1447  * This is currently a very nasty hack - allowing only delegation to itself.
1448  */
1449 krb5_error_code hdb_samba4_check_constrained_delegation(krb5_context context, HDB *db,
1450                                                         hdb_entry_ex *entry,
1451                                                         krb5_const_principal target_principal)
1452 {
1453         struct ldb_context *ldb_ctx = (struct ldb_context *)db->hdb_db;
1454         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb_ctx, "loadparm"),
1455                                                           struct loadparm_context);
1456         krb5_error_code ret;
1457         krb5_principal enterprise_prinicpal = NULL;
1458         struct ldb_dn *realm_dn;
1459         struct ldb_message *msg;
1460         struct dom_sid *orig_sid;
1461         struct dom_sid *target_sid;
1462         struct hdb_samba4_private *p = talloc_get_type(entry->ctx, struct hdb_samba4_private);
1463         const char *delegation_check_attrs[] = {
1464                 "objectSid", NULL
1465         };
1466
1467         TALLOC_CTX *mem_ctx = talloc_named(db, 0, "hdb_samba4_check_constrained_delegation");
1468
1469         if (!mem_ctx) {
1470                 ret = ENOMEM;
1471                 krb5_set_error_message(context, ret, "hdb_samba4_fetch: talloc_named() failed!");
1472                 return ret;
1473         }
1474
1475         if (target_principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1476                 /* Need to reparse the enterprise principal to find the real target */
1477                 if (target_principal->name.name_string.len != 1) {
1478                         ret = KRB5_PARSE_MALFORMED;
1479                         krb5_set_error_message(context, ret, "hdb_samba4_check_constrained_delegation: request for delegation to enterprise principal with wrong (%d) number of components",
1480                                                target_principal->name.name_string.len);
1481                         talloc_free(mem_ctx);
1482                         return ret;
1483                 }
1484                 ret = krb5_parse_name(context, target_principal->name.name_string.val[0],
1485                                       &enterprise_prinicpal);
1486                 if (ret) {
1487                         talloc_free(mem_ctx);
1488                         return ret;
1489                 }
1490                 target_principal = enterprise_prinicpal;
1491         }
1492
1493         ret = hdb_samba4_lookup_server(context, db, lp_ctx, mem_ctx, target_principal,
1494                                        delegation_check_attrs, &realm_dn, &msg);
1495
1496         krb5_free_principal(context, enterprise_prinicpal);
1497
1498         if (ret != 0) {
1499                 talloc_free(mem_ctx);
1500                 return ret;
1501         }
1502
1503         orig_sid = samdb_result_dom_sid(mem_ctx, p->msg, "objectSid");
1504         target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
1505
1506         /* Allow delegation to the same principal, even if by a different
1507          * name.  The easy and safe way to prove this is by SID
1508          * comparison */
1509         if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
1510                 talloc_free(mem_ctx);
1511                 return KRB5KDC_ERR_BADOPTION;
1512         }
1513
1514         talloc_free(mem_ctx);
1515         return ret;
1516 }
1517
1518 /* Certificates printed by a the Certificate Authority might have a
1519  * slightly different form of the user principal name to that in the
1520  * database.  Allow a mismatch where they both refer to the same
1521  * SID */
1522
1523 krb5_error_code hdb_samba4_check_pkinit_ms_upn_match(krb5_context context, HDB *db,
1524                                                      hdb_entry_ex *entry,
1525                                                      krb5_const_principal certificate_principal)
1526 {
1527         struct ldb_context *ldb_ctx = (struct ldb_context *)db->hdb_db;
1528         struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb_ctx, "loadparm"),
1529                                                           struct loadparm_context);
1530         krb5_error_code ret;
1531         struct ldb_dn *realm_dn;
1532         struct ldb_message *msg;
1533         struct dom_sid *orig_sid;
1534         struct dom_sid *target_sid;
1535         struct hdb_samba4_private *p = talloc_get_type(entry->ctx, struct hdb_samba4_private);
1536         const char *ms_upn_check_attrs[] = {
1537                 "objectSid", NULL
1538         };
1539
1540         TALLOC_CTX *mem_ctx = talloc_named(db, 0, "hdb_samba4_check_constrained_delegation");
1541
1542         if (!mem_ctx) {
1543                 ret = ENOMEM;
1544                 krb5_set_error_message(context, ret, "hdb_samba4_fetch: talloc_named() failed!");
1545                 return ret;
1546         }
1547
1548         ret = hdb_samba4_lookup_client(context, db, lp_ctx,
1549                                        mem_ctx, certificate_principal,
1550                                        ms_upn_check_attrs, &realm_dn, &msg);
1551
1552         if (ret != 0) {
1553                 talloc_free(mem_ctx);
1554                 return ret;
1555         }
1556
1557         orig_sid = samdb_result_dom_sid(mem_ctx, p->msg, "objectSid");
1558         target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
1559
1560         /* Consider these to be the same principal, even if by a different
1561          * name.  The easy and safe way to prove this is by SID
1562          * comparison */
1563         if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
1564                 talloc_free(mem_ctx);
1565                 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1566         }
1567
1568         talloc_free(mem_ctx);
1569         return ret;
1570 }
1571
1572 /* This interface is to be called by the KDC and libnet_keytab_dump, which is expecting Samba
1573  * calling conventions.  It is also called by a wrapper
1574  * (hdb_samba4_create) from the kpasswdd -> krb5 -> keytab_hdb -> hdb
1575  * code */
1576
1577 NTSTATUS hdb_samba4_create_kdc(TALLOC_CTX *mem_ctx,
1578                               struct tevent_context *ev_ctx,
1579                               struct loadparm_context *lp_ctx,
1580                               krb5_context context, struct HDB **db)
1581 {
1582         NTSTATUS nt_status;
1583         struct auth_session_info *session_info;
1584         *db = talloc(mem_ctx, HDB);
1585         if (!*db) {
1586                 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
1587                 return NT_STATUS_NO_MEMORY;
1588         }
1589
1590         (*db)->hdb_master_key_set = 0;
1591         (*db)->hdb_db = NULL;
1592         (*db)->hdb_capability_flags = 0;
1593
1594         nt_status = auth_system_session_info(*db, lp_ctx, &session_info);
1595         if (!NT_STATUS_IS_OK(nt_status)) {
1596                 return nt_status;
1597         }
1598
1599         /* The idea here is very simple.  Using Kerberos to
1600          * authenticate the KDC to the LDAP server is higly likely to
1601          * be circular.
1602          *
1603          * In future we may set this up to use EXERNAL and SSL
1604          * certificates, for now it will almost certainly be NTLMSSP
1605         */
1606
1607         cli_credentials_set_kerberos_state(session_info->credentials,
1608                                            CRED_DONT_USE_KERBEROS);
1609
1610         /* Setup the link to LDB */
1611         (*db)->hdb_db = samdb_connect(*db, ev_ctx, lp_ctx, session_info);
1612         if ((*db)->hdb_db == NULL) {
1613                 DEBUG(1, ("hdb_samba4_create: Cannot open samdb for KDC backend!"));
1614                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1615         }
1616
1617         (*db)->hdb_dbc = NULL;
1618         (*db)->hdb_open = hdb_samba4_open;
1619         (*db)->hdb_close = hdb_samba4_close;
1620         (*db)->hdb_fetch = hdb_samba4_fetch;
1621         (*db)->hdb_store = hdb_samba4_store;
1622         (*db)->hdb_remove = hdb_samba4_remove;
1623         (*db)->hdb_firstkey = hdb_samba4_firstkey;
1624         (*db)->hdb_nextkey = hdb_samba4_nextkey;
1625         (*db)->hdb_lock = hdb_samba4_lock;
1626         (*db)->hdb_unlock = hdb_samba4_unlock;
1627         (*db)->hdb_rename = hdb_samba4_rename;
1628         /* we don't implement these, as we are not a lockable database */
1629         (*db)->hdb__get = NULL;
1630         (*db)->hdb__put = NULL;
1631         /* kadmin should not be used for deletes - use other tools instead */
1632         (*db)->hdb__del = NULL;
1633         (*db)->hdb_destroy = hdb_samba4_destroy;
1634
1635         (*db)->hdb_auth_status = NULL;
1636         (*db)->hdb_check_constrained_delegation = hdb_samba4_check_constrained_delegation;
1637         (*db)->hdb_check_pkinit_ms_upn_match = hdb_samba4_check_pkinit_ms_upn_match;
1638
1639         return NT_STATUS_OK;
1640 }
1641
1642 static krb5_error_code hdb_samba4_create(krb5_context context, struct HDB **db, const char *arg)
1643 {
1644         NTSTATUS nt_status;
1645         void *ptr;
1646         struct hdb_samba4_context *hdb_samba4_context;
1647         if (sscanf(arg, "&%p", &ptr) != 1) {
1648                 return EINVAL;
1649         }
1650         hdb_samba4_context = talloc_get_type_abort(ptr, struct hdb_samba4_context);
1651         /* The global kdc_mem_ctx and kdc_lp_ctx, Disgusting, ugly hack, but it means one less private hook */
1652         nt_status = hdb_samba4_create_kdc(hdb_samba4_context, hdb_samba4_context->ev_ctx, hdb_samba4_context->lp_ctx,
1653                                           context, db);
1654
1655         if (NT_STATUS_IS_OK(nt_status)) {
1656                 return 0;
1657         }
1658         return EINVAL;
1659 }
1660
1661 /* Only used in the hdb-backed keytab code
1662  * for a keytab of 'samba4&<address>', to find
1663  * kpasswd's key in the main DB, and to
1664  * copy all the keys into a file (libnet_keytab_export)
1665  *
1666  * The <address> is the string form of a pointer to a talloced struct hdb_samba_context
1667  */
1668 struct hdb_method hdb_samba4 = {
1669         .interface_version = HDB_INTERFACE_VERSION,
1670         .prefix = "samba4",
1671         .create = hdb_samba4_create
1672 };