source4/kdc/db-glue.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Database Glue between Samba and the KDC
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2009
   7    Copyright (C) Simo Sorce <idra@samba.org> 2010
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "system/time.h"
  26 #include "../libds/common/flags.h"
  27 #include "lib/ldb/include/ldb.h"
  28 #include "librpc/gen_ndr/netlogon.h"
  29 #include "libcli/security/security.h"
  30 #include "auth/auth.h"
  31 #include "auth/credentials/credentials.h"
  32 #include "auth/auth_sam.h"
  33 #include "../lib/util/util_ldb.h"
  34 #include "dsdb/samdb/samdb.h"
  35 #include "dsdb/common/util.h"
  36 #include "librpc/ndr/libndr.h"
  37 #include "librpc/gen_ndr/ndr_drsblobs.h"
  38 #include "librpc/gen_ndr/lsa.h"
  39 #include "libcli/auth/libcli_auth.h"
  40 #include "param/param.h"
  41 #include "../lib/crypto/md4.h"
  42 #include "system/kerberos.h"
  43 #include "auth/kerberos/kerberos.h"
  44 #include <hdb.h>
  45 #include "kdc/samba_kdc.h"
  46 #include "kdc/db-glue.h"
  47
  48 enum samba_kdc_ent_type
  49 { SAMBA_KDC_ENT_TYPE_CLIENT, SAMBA_KDC_ENT_TYPE_SERVER,
  50   SAMBA_KDC_ENT_TYPE_KRBTGT, SAMBA_KDC_ENT_TYPE_TRUST, SAMBA_KDC_ENT_TYPE_ANY };
  51
  52 enum trust_direction {
  53         UNKNOWN = 0,
  54         INBOUND = LSA_TRUST_DIRECTION_INBOUND,
  55         OUTBOUND = LSA_TRUST_DIRECTION_OUTBOUND
  56 };
  57
  58 static const char *trust_attrs[] = {
  59         "trustPartner",
  60         "trustAuthIncoming",
  61         "trustAuthOutgoing",
  62         "whenCreated",
  63         "msDS-SupportedEncryptionTypes",
  64         "trustAttributes",
  65         "trustDirection",
  66         "trustType",
  67         NULL
  68 };
  69
  70 static KerberosTime ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, KerberosTime default_val)
  71 {
  72     const char *tmp;
  73     const char *gentime;
  74     struct tm tm;
  75
  76     gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
  77     if (!gentime)
  78         return default_val;
  79
  80     tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
  81     if (tmp == NULL) {
  82             return default_val;
  83     }
  84
  85     return timegm(&tm);
  86 }
  87
  88 static HDBFlags uf2HDBFlags(krb5_context context, int userAccountControl, enum samba_kdc_ent_type ent_type)
  89 {
  90         HDBFlags flags = int2HDBFlags(0);
  91
  92         /* we don't allow kadmin deletes */
  93         flags.immutable = 1;
  94
  95         /* mark the principal as invalid to start with */
  96         flags.invalid = 1;
  97
  98         flags.renewable = 1;
  99
 100         /* All accounts are servers, but this may be disabled again in the caller */
 101         flags.server = 1;
 102
 103         /* Account types - clear the invalid bit if it turns out to be valid */
 104         if (userAccountControl & UF_NORMAL_ACCOUNT) {
 105                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
 106                         flags.client = 1;
 107                 }
 108                 flags.invalid = 0;
 109         }
 110
 111         if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
 112                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
 113                         flags.client = 1;
 114                 }
 115                 flags.invalid = 0;
 116         }
 117         if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
 118                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
 119                         flags.client = 1;
 120                 }
 121                 flags.invalid = 0;
 122         }
 123         if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
 124                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
 125                         flags.client = 1;
 126                 }
 127                 flags.invalid = 0;
 128         }
 129
 130         /* Not permitted to act as a client if disabled */
 131         if (userAccountControl & UF_ACCOUNTDISABLE) {
 132                 flags.client = 0;
 133         }
 134         if (userAccountControl & UF_LOCKOUT) {
 135                 flags.invalid = 1;
 136         }
 137 /*
 138         if (userAccountControl & UF_PASSWORD_NOTREQD) {
 139                 flags.invalid = 1;
 140         }
 141 */
 142 /*
 143         UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
 144 */
 145         if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
 146                 flags.invalid = 1;
 147         }
 148
 149 /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in samba_kdc_message2entry() */
 150
 151 /*
 152         if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
 153                 flags.invalid = 1;
 154         }
 155 */
 156         if (userAccountControl & UF_SMARTCARD_REQUIRED) {
 157                 flags.require_hwauth = 1;
 158         }
 159         if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
 160                 flags.ok_as_delegate = 1;
 161         }
 162         if (!(userAccountControl & UF_NOT_DELEGATED)) {
 163                 flags.forwardable = 1;
 164                 flags.proxiable = 1;
 165         }
 166
 167         if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
 168                 flags.require_preauth = 0;
 169         } else {
 170                 flags.require_preauth = 1;
 171
 172         }
 173         return flags;
 174 }
 175
 176 static int samba_kdc_entry_destructor(struct samba_kdc_entry *p)
 177 {
 178     hdb_entry_ex *entry_ex = p->entry_ex;
 179     free_hdb_entry(&entry_ex->entry);
 180     return 0;
 181 }
 182
 183 static void samba_kdc_free_entry(krb5_context context, hdb_entry_ex *entry_ex)
 184 {
 185         /* this function is called only from hdb_free_entry().
 186          * Make sure we neutralize the destructor or we will
 187          * get a double free later when hdb_free_entry() will
 188          * try to call free_hdb_entry() */
 189         talloc_set_destructor(entry_ex->ctx, NULL);
 190
 191         /* now proceed to free the talloc part */
 192         talloc_free(entry_ex->ctx);
 193 }
 194
 195 static krb5_error_code samba_kdc_message2entry_keys(krb5_context context,
 196                                                     TALLOC_CTX *mem_ctx,
 197                                                     struct ldb_message *msg,
 198                                                     uint32_t rid,
 199                                                     unsigned int userAccountControl,
 200                                                     enum samba_kdc_ent_type ent_type,
 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         uint16_t i;
 214         uint16_t allocated_keys = 0;
 215
 216         /* Supported Enc for this entry */
 217         uint32_t supported_enctypes = ENC_ALL_TYPES; /* by default, we support all enc types */
 218
 219         /* However, if this is a TGS-REQ, then lock it down to a
 220          * reasonable guess as to what the server can decode.  The
 221          * krbtgt is special - default to use what is stored for the KDC */
 222         if (rid != DOMAIN_RID_KRBTGT && ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
 223                 /* This is the standard set for a server that has not declared a msDS-SupportedEncryptionTypes */
 224                 supported_enctypes = ENC_CRC32 | ENC_RSA_MD5 | ENC_RC4_HMAC_MD5;
 225         }
 226         supported_enctypes = ldb_msg_find_attr_as_uint(msg, "msDS-SupportedEncryptionTypes",
 227                                                         supported_enctypes);
 228         if (rid == DOMAIN_RID_KRBTGT) {
 229                 /* Be double-sure never to use DES here */
 230                 supported_enctypes &= ~(ENC_CRC32|ENC_RSA_MD5);
 231         }
 232
 233         switch (ent_type) {
 234         case SAMBA_KDC_ENT_TYPE_KRBTGT:
 235         case SAMBA_KDC_ENT_TYPE_TRUST:
 236                 /* Disallow krbtgt and trust tickets to be DES encrypted, it's just too dangerous */
 237                 supported_enctypes &= ~(ENC_CRC32|ENC_RSA_MD5);
 238                 break;
 239         default:
 240                 break;
 241                 /* No further restrictions */
 242         }
 243
 244         /* If UF_USE_DES_KEY_ONLY has been set, then don't allow use of the newer enc types */
 245         if (userAccountControl & UF_USE_DES_KEY_ONLY) {
 246                 /* However, don't allow use of DES, if we were told not to by msDS-SupportedEncTypes */
 247                 supported_enctypes &= ENC_CRC32|ENC_RSA_MD5;
 248         }
 249
 250         entry_ex->entry.keys.val = NULL;
 251         entry_ex->entry.keys.len = 0;
 252
 253         entry_ex->entry.kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
 254
 255         /* Get keys from the db */
 256
 257         hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
 258         sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
 259
 260         /* unicodePwd for enctype 0x17 (23) if present */
 261         if (hash) {
 262                 allocated_keys++;
 263         }
 264
 265         /* supplementalCredentials if present */
 266         if (sc_val) {
 267                 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, &scb,
 268                                                    (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
 269                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 270                         dump_data(0, sc_val->data, sc_val->length);
 271                         ret = EINVAL;
 272                         goto out;
 273                 }
 274
 275                 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
 276                         NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
 277                         ret = EINVAL;
 278                         goto out;
 279                 }
 280
 281                 for (i=0; i < scb.sub.num_packages; i++) {
 282                         if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
 283                                 scpk = &scb.sub.packages[i];
 284                                 if (!scpk->data || !scpk->data[0]) {
 285                                         scpk = NULL;
 286                                         continue;
 287                                 }
 288                                 newer_keys = true;
 289                                 break;
 290                         } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
 291                                 scpk = &scb.sub.packages[i];
 292                                 if (!scpk->data || !scpk->data[0]) {
 293                                         scpk = NULL;
 294                                 }
 295                                 /*
 296                                  * we don't break here in hope to find
 297                                  * a Kerberos-Newer-Keys package
 298                                  */
 299                         }
 300                 }
 301         }
 302         /*
 303          * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
 304          * of supplementalCredentials
 305          */
 306         if (scpk) {
 307                 DATA_BLOB blob;
 308
 309                 blob = strhex_to_data_blob(mem_ctx, scpk->data);
 310                 if (!blob.data) {
 311                         ret = ENOMEM;
 312                         goto out;
 313                 }
 314
 315                 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
 316                 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &_pkb,
 317                                                (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
 318                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 319                         ret = EINVAL;
 320                         krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 321                         krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 322                         goto out;
 323                 }
 324
 325                 if (newer_keys && _pkb.version != 4) {
 326                         ret = EINVAL;
 327                         krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 328                         krb5_warnx(context, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 329                         goto out;
 330                 }
 331
 332                 if (!newer_keys && _pkb.version != 3) {
 333                         ret = EINVAL;
 334                         krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
 335                         krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
 336                         goto out;
 337                 }
 338
 339                 if (_pkb.version == 4) {
 340                         pkb4 = &_pkb.ctr.ctr4;
 341                         allocated_keys += pkb4->num_keys;
 342                 } else if (_pkb.version == 3) {
 343                         pkb3 = &_pkb.ctr.ctr3;
 344                         allocated_keys += pkb3->num_keys;
 345                 }
 346         }
 347
 348         if (allocated_keys == 0) {
 349                 /* oh, no password.  Apparently (comment in
 350                  * hdb-ldap.c) this violates the ASN.1, but this
 351                  * allows an entry with no keys (yet). */
 352                 return 0;
 353         }
 354
 355         /* allocate space to decode into */
 356         entry_ex->entry.keys.len = 0;
 357         entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(Key));
 358         if (entry_ex->entry.keys.val == NULL) {
 359                 ret = ENOMEM;
 360                 goto out;
 361         }
 362
 363         if (hash && (supported_enctypes & ENC_RC4_HMAC_MD5)) {
 364                 Key key;
 365
 366                 key.mkvno = 0;
 367                 key.salt = NULL; /* No salt for this enc type */
 368
 369                 ret = krb5_keyblock_init(context,
 370                                          ENCTYPE_ARCFOUR_HMAC,
 371                                          hash->hash, sizeof(hash->hash),
 372                                          &key.key);
 373                 if (ret) {
 374                         goto out;
 375                 }
 376
 377                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 378                 entry_ex->entry.keys.len++;
 379         }
 380
 381         if (pkb4) {
 382                 for (i=0; i < pkb4->num_keys; i++) {
 383                         Key key;
 384
 385                         if (!pkb4->keys[i].value) continue;
 386
 387                         if (!(kerberos_enctype_to_bitmap(pkb4->keys[i].keytype) & supported_enctypes)) {
 388                                 continue;
 389                         }
 390
 391                         key.mkvno = 0;
 392                         key.salt = NULL;
 393
 394                         if (pkb4->salt.string) {
 395                                 DATA_BLOB salt;
 396
 397                                 salt = data_blob_string_const(pkb4->salt.string);
 398
 399                                 key.salt = calloc(1, sizeof(*key.salt));
 400                                 if (key.salt == NULL) {
 401                                         ret = ENOMEM;
 402                                         goto out;
 403                                 }
 404
 405                                 key.salt->type = hdb_pw_salt;
 406
 407                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
 408                                 if (ret) {
 409                                         free(key.salt);
 410                                         key.salt = NULL;
 411                                         goto out;
 412                                 }
 413                         }
 414
 415                         /* TODO: maybe pass the iteration_count somehow... */
 416
 417                         ret = krb5_keyblock_init(context,
 418                                                  pkb4->keys[i].keytype,
 419                                                  pkb4->keys[i].value->data,
 420                                                  pkb4->keys[i].value->length,
 421                                                  &key.key);
 422                         if (ret == KRB5_PROG_ETYPE_NOSUPP) {
 423                                 DEBUG(2,("Unsupported keytype ignored - type %u\n",
 424                                          pkb4->keys[i].keytype));
 425                                 ret = 0;
 426                                 continue;
 427                         }
 428                         if (ret) {
 429                                 if (key.salt) {
 430                                         free_Salt(key.salt);
 431                                         free(key.salt);
 432                                         key.salt = NULL;
 433                                 }
 434                                 goto out;
 435                         }
 436
 437                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 438                         entry_ex->entry.keys.len++;
 439                 }
 440         } else if (pkb3) {
 441                 for (i=0; i < pkb3->num_keys; i++) {
 442                         Key key;
 443
 444                         if (!pkb3->keys[i].value) continue;
 445
 446                         if (!(kerberos_enctype_to_bitmap(pkb3->keys[i].keytype) & supported_enctypes)) {
 447                                 continue;
 448                         }
 449
 450                         key.mkvno = 0;
 451                         key.salt = NULL;
 452
 453                         if (pkb3->salt.string) {
 454                                 DATA_BLOB salt;
 455
 456                                 salt = data_blob_string_const(pkb3->salt.string);
 457
 458                                 key.salt = calloc(1, sizeof(*key.salt));
 459                                 if (key.salt == NULL) {
 460                                         ret = ENOMEM;
 461                                         goto out;
 462                                 }
 463
 464                                 key.salt->type = hdb_pw_salt;
 465
 466                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
 467                                 if (ret) {
 468                                         free(key.salt);
 469                                         key.salt = NULL;
 470                                         goto out;
 471                                 }
 472                         }
 473
 474                         ret = krb5_keyblock_init(context,
 475                                                  pkb3->keys[i].keytype,
 476                                                  pkb3->keys[i].value->data,
 477                                                  pkb3->keys[i].value->length,
 478                                                  &key.key);
 479                         if (ret) {
 480                                 if (key.salt) {
 481                                         free_Salt(key.salt);
 482                                         free(key.salt);
 483                                         key.salt = NULL;
 484                                 }
 485                                 goto out;
 486                         }
 487
 488                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 489                         entry_ex->entry.keys.len++;
 490                 }
 491         }
 492
 493 out:
 494         if (ret != 0) {
 495                 entry_ex->entry.keys.len = 0;
 496         }
 497         if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
 498                 free(entry_ex->entry.keys.val);
 499                 entry_ex->entry.keys.val = NULL;
 500         }
 501         return ret;
 502 }
 503
 504 /*
 505  * Construct an hdb_entry from a directory entry.
 506  */
 507 static krb5_error_code samba_kdc_message2entry(krb5_context context,
 508                                          struct samba_kdc_db_context *kdc_db_ctx,
 509                                          TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 510                                          enum samba_kdc_ent_type ent_type,
 511                                          struct ldb_dn *realm_dn,
 512                                          struct ldb_message *msg,
 513                                          hdb_entry_ex *entry_ex)
 514 {
 515         struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
 516         unsigned int userAccountControl;
 517         unsigned int i;
 518         krb5_error_code ret = 0;
 519         krb5_boolean is_computer = FALSE;
 520         char *realm = strupper_talloc(mem_ctx, lpcfg_realm(lp_ctx));
 521
 522         struct samba_kdc_entry *p;
 523         NTTIME acct_expiry;
 524         NTSTATUS status;
 525
 526         uint32_t rid;
 527         struct ldb_message_element *objectclasses;
 528         struct ldb_val computer_val;
 529         const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
 530         computer_val.data = discard_const_p(uint8_t,"computer");
 531         computer_val.length = strlen((const char *)computer_val.data);
 532
 533         if (!samAccountName) {
 534                 ret = ENOENT;
 535                 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no samAccountName present");
 536                 goto out;
 537         }
 538
 539         objectclasses = ldb_msg_find_element(msg, "objectClass");
 540
 541         if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
 542                 is_computer = TRUE;
 543         }
 544
 545         memset(entry_ex, 0, sizeof(*entry_ex));
 546
 547         if (!realm) {
 548                 ret = ENOMEM;
 549                 krb5_set_error_message(context, ret, "talloc_strdup: out of memory");
 550                 goto out;
 551         }
 552
 553         p = talloc(mem_ctx, struct samba_kdc_entry);
 554         if (!p) {
 555                 ret = ENOMEM;
 556                 goto out;
 557         }
 558
 559         p->kdc_db_ctx = kdc_db_ctx;
 560         p->entry_ex = entry_ex;
 561         p->realm_dn = talloc_reference(p, realm_dn);
 562         if (!p->realm_dn) {
 563                 ret = ENOMEM;
 564                 goto out;
 565         }
 566
 567         talloc_set_destructor(p, samba_kdc_entry_destructor);
 568
 569         /* make sure we do not have bogus data in there */
 570         memset(&entry_ex->entry, 0, sizeof(hdb_entry));
 571
 572         entry_ex->ctx = p;
 573         entry_ex->free_entry = samba_kdc_free_entry;
 574
 575         userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
 576
 577
 578         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 579         if (ent_type == SAMBA_KDC_ENT_TYPE_ANY && principal == NULL) {
 580                 krb5_make_principal(context, &entry_ex->entry.principal, realm, samAccountName, NULL);
 581         } else {
 582                 ret = copy_Principal(principal, entry_ex->entry.principal);
 583                 if (ret) {
 584                         krb5_clear_error_message(context);
 585                         goto out;
 586                 }
 587
 588                 /* While we have copied the client principal, tests
 589                  * show that Win2k3 returns the 'corrected' realm, not
 590                  * the client-specified realm.  This code attempts to
 591                  * replace the client principal's realm with the one
 592                  * we determine from our records */
 593
 594                 /* this has to be with malloc() */
 595                 krb5_principal_set_realm(context, entry_ex->entry.principal, realm);
 596         }
 597
 598         /* First try and figure out the flags based on the userAccountControl */
 599         entry_ex->entry.flags = uf2HDBFlags(context, userAccountControl, ent_type);
 600
 601         /* Windows 2008 seems to enforce this (very sensible) rule by
 602          * default - don't allow offline attacks on a user's password
 603          * by asking for a ticket to them as a service (encrypted with
 604          * their probably patheticly insecure password) */
 605
 606         if (entry_ex->entry.flags.server
 607             && lpcfg_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
 608                 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
 609                         entry_ex->entry.flags.server = 0;
 610                 }
 611         }
 612
 613         {
 614                 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
 615                  * of the Heimdal KDC.  They are stored in a the traditional
 616                  * DB for audit purposes, and still form part of the structure
 617                  * we must return */
 618
 619                 /* use 'whenCreated' */
 620                 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 621                 /* use 'kadmin' for now (needed by mit_samba) */
 622                 krb5_make_principal(context,
 623                                     &entry_ex->entry.created_by.principal,
 624                                     realm, "kadmin", NULL);
 625
 626                 entry_ex->entry.modified_by = (Event *) malloc(sizeof(Event));
 627                 if (entry_ex->entry.modified_by == NULL) {
 628                         ret = ENOMEM;
 629                         krb5_set_error_message(context, ret, "malloc: out of memory");
 630                         goto out;
 631                 }
 632
 633                 /* use 'whenChanged' */
 634                 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
 635                 /* use 'kadmin' for now (needed by mit_samba) */
 636                 krb5_make_principal(context,
 637                                     &entry_ex->entry.modified_by->principal,
 638                                     realm, "kadmin", NULL);
 639         }
 640
 641
 642         /* The lack of password controls etc applies to krbtgt by
 643          * virtue of being that particular RID */
 644         status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
 645
 646         if (!NT_STATUS_IS_OK(status)) {
 647                 ret = EINVAL;
 648                 goto out;
 649         }
 650
 651         if (rid == DOMAIN_RID_KRBTGT) {
 652                 entry_ex->entry.valid_end = NULL;
 653                 entry_ex->entry.pw_end = NULL;
 654
 655                 entry_ex->entry.flags.invalid = 0;
 656                 entry_ex->entry.flags.server = 1;
 657
 658                 /* Don't mark all requests for the krbtgt/realm as
 659                  * 'change password', as otherwise we could get into
 660                  * trouble, and not enforce the password expirty.
 661                  * Instead, only do it when request is for the kpasswd service */
 662                 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER
 663                     && principal->name.name_string.len == 2
 664                     && (strcmp(principal->name.name_string.val[0], "kadmin") == 0)
 665                     && (strcmp(principal->name.name_string.val[1], "changepw") == 0)
 666                     && lpcfg_is_my_domain_or_realm(lp_ctx, principal->realm)) {
 667                         entry_ex->entry.flags.change_pw = 1;
 668                 }
 669                 entry_ex->entry.flags.client = 0;
 670                 entry_ex->entry.flags.forwardable = 1;
 671                 entry_ex->entry.flags.ok_as_delegate = 1;
 672         } else if (entry_ex->entry.flags.server && ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
 673                 /* The account/password expiry only applies when the account is used as a
 674                  * client (ie password login), not when used as a server */
 675
 676                 /* Make very well sure we don't use this for a client,
 677                  * it could bypass the password restrictions */
 678                 entry_ex->entry.flags.client = 0;
 679
 680                 entry_ex->entry.valid_end = NULL;
 681                 entry_ex->entry.pw_end = NULL;
 682
 683         } else {
 684                 NTTIME must_change_time
 685                         = samdb_result_force_password_change(kdc_db_ctx->samdb, mem_ctx,
 686                                                              realm_dn, msg);
 687                 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
 688                         entry_ex->entry.pw_end = NULL;
 689                 } else {
 690                         entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
 691                         if (entry_ex->entry.pw_end == NULL) {
 692                                 ret = ENOMEM;
 693                                 goto out;
 694                         }
 695                         *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
 696                 }
 697
 698                 acct_expiry = samdb_result_account_expires(msg);
 699                 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
 700                         entry_ex->entry.valid_end = NULL;
 701                 } else {
 702                         entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
 703                         if (entry_ex->entry.valid_end == NULL) {
 704                                 ret = ENOMEM;
 705                                 goto out;
 706                         }
 707                         *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
 708                 }
 709         }
 710
 711         entry_ex->entry.valid_start = NULL;
 712
 713         entry_ex->entry.max_life = NULL;
 714
 715         entry_ex->entry.max_renew = NULL;
 716
 717         entry_ex->entry.generation = NULL;
 718
 719         /* Get keys from the db */
 720         ret = samba_kdc_message2entry_keys(context, p, msg,
 721                                            rid, userAccountControl,
 722                                            ent_type, entry_ex);
 723         if (ret) {
 724                 /* Could be bougus data in the entry, or out of memory */
 725                 goto out;
 726         }
 727
 728         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 729         if (entry_ex->entry.etypes == NULL) {
 730                 krb5_clear_error_message(context);
 731                 ret = ENOMEM;
 732                 goto out;
 733         }
 734         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 735         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 736         if (entry_ex->entry.etypes->val == NULL) {
 737                 krb5_clear_error_message(context);
 738                 ret = ENOMEM;
 739                 goto out;
 740         }
 741         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 742                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 743         }
 744
 745
 746         p->msg = talloc_steal(p, msg);
 747
 748 out:
 749         if (ret != 0) {
 750                 /* This doesn't free ent itself, that is for the eventual caller to do */
 751                 hdb_free_entry(context, entry_ex);
 752         } else {
 753                 talloc_steal(kdc_db_ctx, entry_ex->ctx);
 754         }
 755
 756         return ret;
 757 }
 758
 759 /*
 760  * Construct an hdb_entry from a directory entry.
 761  */
 762 static krb5_error_code samba_kdc_trust_message2entry(krb5_context context,
 763                                                struct samba_kdc_db_context *kdc_db_ctx,
 764                                                TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 765                                                enum trust_direction direction,
 766                                                struct ldb_dn *realm_dn,
 767                                                struct ldb_message *msg,
 768                                                hdb_entry_ex *entry_ex)
 769 {
 770         struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
 771         const char *dnsdomain;
 772         char *realm = strupper_talloc(mem_ctx, lpcfg_realm(lp_ctx));
 773         DATA_BLOB password_utf16;
 774         struct samr_Password password_hash;
 775         const struct ldb_val *password_val;
 776         struct trustAuthInOutBlob password_blob;
 777         struct samba_kdc_entry *p;
 778
 779         enum ndr_err_code ndr_err;
 780         int ret, trust_direction_flags;
 781         unsigned int i;
 782
 783         p = talloc(mem_ctx, struct samba_kdc_entry);
 784         if (!p) {
 785                 ret = ENOMEM;
 786                 goto out;
 787         }
 788
 789         p->kdc_db_ctx = kdc_db_ctx;
 790         p->entry_ex = entry_ex;
 791         p->realm_dn = realm_dn;
 792
 793         talloc_set_destructor(p, samba_kdc_entry_destructor);
 794
 795         /* make sure we do not have bogus data in there */
 796         memset(&entry_ex->entry, 0, sizeof(hdb_entry));
 797
 798         entry_ex->ctx = p;
 799         entry_ex->free_entry = samba_kdc_free_entry;
 800
 801         /* use 'whenCreated' */
 802         entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 803         /* use 'kadmin' for now (needed by mit_samba) */
 804         krb5_make_principal(context,
 805                             &entry_ex->entry.created_by.principal,
 806                             realm, "kadmin", NULL);
 807
 808         entry_ex->entry.valid_start = NULL;
 809
 810         trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
 811
 812         if (direction == INBOUND) {
 813                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
 814
 815         } else { /* OUTBOUND */
 816                 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
 817                 /* replace realm */
 818                 talloc_free(realm);
 819                 realm = strupper_talloc(mem_ctx, dnsdomain);
 820                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
 821         }
 822
 823         if (!password_val || !(trust_direction_flags & direction)) {
 824                 ret = ENOENT;
 825                 goto out;
 826         }
 827
 828         ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, &password_blob,
 829                                            (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
 830         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 831                 ret = EINVAL;
 832                 goto out;
 833         }
 834
 835         entry_ex->entry.kvno = -1;
 836         for (i=0; i < password_blob.count; i++) {
 837                 if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_VERSION) {
 838                         entry_ex->entry.kvno = password_blob.current->array[i].AuthInfo.version.version;
 839                 }
 840         }
 841
 842         for (i=0; i < password_blob.count; i++) {
 843                 if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
 844                         password_utf16 = data_blob_const(password_blob.current->array[i].AuthInfo.clear.password,
 845                                                          password_blob.current->array[i].AuthInfo.clear.size);
 846                         /* In the future, generate all sorts of
 847                          * hashes, but for now we can't safely convert
 848                          * the random strings windows uses into
 849                          * utf8 */
 850
 851                         /* but as it is utf16 already, we can get the NT password/arcfour-hmac-md5 key */
 852                         mdfour(password_hash.hash, password_utf16.data, password_utf16.length);
 853                         break;
 854                 } else if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
 855                         password_hash = password_blob.current->array[i].AuthInfo.nt4owf.password;
 856                         break;
 857                 }
 858         }
 859
 860         if (i < password_blob.count) {
 861                 Key key;
 862                 /* Must have found a cleartext or MD4 password */
 863                 entry_ex->entry.keys.val = calloc(1, sizeof(Key));
 864
 865                 key.mkvno = 0;
 866                 key.salt = NULL; /* No salt for this enc type */
 867
 868                 if (entry_ex->entry.keys.val == NULL) {
 869                         ret = ENOMEM;
 870                         goto out;
 871                 }
 872
 873                 ret = krb5_keyblock_init(context,
 874                                          ENCTYPE_ARCFOUR_HMAC,
 875                                          password_hash.hash, sizeof(password_hash.hash),
 876                                          &key.key);
 877
 878                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 879                 entry_ex->entry.keys.len++;
 880         }
 881
 882         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 883
 884         ret = copy_Principal(principal, entry_ex->entry.principal);
 885         if (ret) {
 886                 krb5_clear_error_message(context);
 887                 goto out;
 888         }
 889
 890         /* While we have copied the client principal, tests
 891          * show that Win2k3 returns the 'corrected' realm, not
 892          * the client-specified realm.  This code attempts to
 893          * replace the client principal's realm with the one
 894          * we determine from our records */
 895
 896         krb5_principal_set_realm(context, entry_ex->entry.principal, realm);
 897         entry_ex->entry.flags = int2HDBFlags(0);
 898         entry_ex->entry.flags.immutable = 1;
 899         entry_ex->entry.flags.invalid = 0;
 900         entry_ex->entry.flags.server = 1;
 901         entry_ex->entry.flags.require_preauth = 1;
 902
 903         entry_ex->entry.pw_end = NULL;
 904
 905         entry_ex->entry.max_life = NULL;
 906
 907         entry_ex->entry.max_renew = NULL;
 908
 909         entry_ex->entry.generation = NULL;
 910
 911         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 912         if (entry_ex->entry.etypes == NULL) {
 913                 krb5_clear_error_message(context);
 914                 ret = ENOMEM;
 915                 goto out;
 916         }
 917         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 918         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 919         if (entry_ex->entry.etypes->val == NULL) {
 920                 krb5_clear_error_message(context);
 921                 ret = ENOMEM;
 922                 goto out;
 923         }
 924         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 925                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 926         }
 927
 928
 929         p->msg = talloc_steal(p, msg);
 930
 931 out:
 932         if (ret != 0) {
 933                 /* This doesn't free ent itself, that is for the eventual caller to do */
 934                 hdb_free_entry(context, entry_ex);
 935         } else {
 936                 talloc_steal(kdc_db_ctx, entry_ex->ctx);
 937         }
 938
 939         return ret;
 940
 941 }
 942
 943 static krb5_error_code samba_kdc_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
 944                                         TALLOC_CTX *mem_ctx,
 945                                         const char *realm,
 946                                         struct ldb_dn *realm_dn,
 947                                         struct ldb_message **pmsg)
 948 {
 949         int lret;
 950         krb5_error_code ret;
 951         char *filter = NULL;
 952         const char * const *attrs = trust_attrs;
 953
 954         struct ldb_result *res = NULL;
 955         filter = talloc_asprintf(mem_ctx, "(&(objectClass=trustedDomain)(|(flatname=%s)(trustPartner=%s)))", realm, realm);
 956
 957         if (!filter) {
 958                 ret = ENOMEM;
 959                 krb5_set_error_message(context, ret, "talloc_asprintf: out of memory");
 960                 return ret;
 961         }
 962
 963         lret = ldb_search(ldb_ctx, mem_ctx, &res,
 964                           ldb_get_default_basedn(ldb_ctx),
 965                           LDB_SCOPE_SUBTREE, attrs, "%s", filter);
 966         if (lret != LDB_SUCCESS) {
 967                 DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx)));
 968                 return HDB_ERR_NOENTRY;
 969         } else if (res->count == 0 || res->count > 1) {
 970                 DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count));
 971                 talloc_free(res);
 972                 return HDB_ERR_NOENTRY;
 973         }
 974         talloc_steal(mem_ctx, res->msgs);
 975         *pmsg = res->msgs[0];
 976         talloc_free(res);
 977         return 0;
 978 }
 979
 980 static krb5_error_code samba_kdc_lookup_client(krb5_context context,
 981                                                 struct samba_kdc_db_context *kdc_db_ctx,
 982                                                 TALLOC_CTX *mem_ctx,
 983                                                 krb5_const_principal principal,
 984                                                 const char **attrs,
 985                                                 struct ldb_dn **realm_dn,
 986                                                 struct ldb_message **msg) {
 987         NTSTATUS nt_status;
 988         char *principal_string;
 989         krb5_error_code ret;
 990
 991         ret = krb5_unparse_name(context, principal, &principal_string);
 992
 993         if (ret != 0) {
 994                 return ret;
 995         }
 996
 997         nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
 998                                               mem_ctx, principal_string, attrs,
 999                                               realm_dn, msg);
1000         free(principal_string);
1001         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1002                 return HDB_ERR_NOENTRY;
1003         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1004                 return ENOMEM;
1005         } else if (!NT_STATUS_IS_OK(nt_status)) {
1006                 return EINVAL;
1007         }
1008
1009         return ret;
1010 }
1011
1012 static krb5_error_code samba_kdc_fetch_client(krb5_context context,
1013                                                struct samba_kdc_db_context *kdc_db_ctx,
1014                                                TALLOC_CTX *mem_ctx,
1015                                                krb5_const_principal principal,
1016                                                hdb_entry_ex *entry_ex) {
1017         struct ldb_dn *realm_dn;
1018         krb5_error_code ret;
1019         struct ldb_message *msg = NULL;
1020
1021         ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1022                                        mem_ctx, principal, user_attrs,
1023                                        &realm_dn, &msg);
1024         if (ret != 0) {
1025                 return ret;
1026         }
1027
1028         ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1029                                        principal, SAMBA_KDC_ENT_TYPE_CLIENT,
1030                                        realm_dn, msg, entry_ex);
1031         return ret;
1032 }
1033
1034 static krb5_error_code samba_kdc_fetch_krbtgt(krb5_context context,
1035                                         struct samba_kdc_db_context *kdc_db_ctx,
1036                                         TALLOC_CTX *mem_ctx,
1037                                         krb5_const_principal principal,
1038                                         hdb_entry_ex *entry_ex)
1039 {
1040         struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1041         krb5_error_code ret;
1042         struct ldb_message *msg = NULL;
1043         struct ldb_dn *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1044         const char *realm;
1045
1046         krb5_principal alloc_principal = NULL;
1047         if (principal->name.name_string.len != 2
1048             || (strcmp(principal->name.name_string.val[0], KRB5_TGS_NAME) != 0)) {
1049                 /* Not a krbtgt */
1050                 return HDB_ERR_NOENTRY;
1051         }
1052
1053         /* krbtgt case.  Either us or a trusted realm */
1054
1055         if (lpcfg_is_my_domain_or_realm(lp_ctx, principal->realm)
1056             && lpcfg_is_my_domain_or_realm(lp_ctx, principal->name.name_string.val[1])) {
1057                 /* us */
1058                 /* Cludge, cludge cludge.  If the realm part of krbtgt/realm,
1059                  * is in our db, then direct the caller at our primary
1060                  * krbtgt */
1061
1062                 int lret;
1063                 char *realm_fixed;
1064
1065                 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1066                                        &msg, realm_dn, LDB_SCOPE_SUBTREE,
1067                                        krbtgt_attrs,
1068                                        DSDB_SEARCH_SHOW_EXTENDED_DN,
1069                                        "(&(objectClass=user)(samAccountName=krbtgt))");
1070                 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1071                         krb5_warnx(context, "samba_kdc_fetch: could not find own KRBTGT in DB!");
1072                         krb5_set_error_message(context, HDB_ERR_NOENTRY, "samba_kdc_fetch: could not find own KRBTGT in DB!");
1073                         return HDB_ERR_NOENTRY;
1074                 } else if (lret != LDB_SUCCESS) {
1075                         krb5_warnx(context, "samba_kdc_fetch: could not find own KRBTGT in DB: %s", ldb_errstring(kdc_db_ctx->samdb));
1076                         krb5_set_error_message(context, HDB_ERR_NOENTRY, "samba_kdc_fetch: could not find own KRBTGT in DB: %s", ldb_errstring(kdc_db_ctx->samdb));
1077                         return HDB_ERR_NOENTRY;
1078                 }
1079
1080                 realm_fixed = strupper_talloc(mem_ctx, lpcfg_realm(lp_ctx));
1081                 if (!realm_fixed) {
1082                         ret = ENOMEM;
1083                         krb5_set_error_message(context, ret, "strupper_talloc: out of memory");
1084                         return ret;
1085                 }
1086
1087                 ret = krb5_copy_principal(context, principal, &alloc_principal);
1088                 if (ret) {
1089                         return ret;
1090                 }
1091
1092                 free(alloc_principal->name.name_string.val[1]);
1093                 alloc_principal->name.name_string.val[1] = strdup(realm_fixed);
1094                 talloc_free(realm_fixed);
1095                 if (!alloc_principal->name.name_string.val[1]) {
1096                         ret = ENOMEM;
1097                         krb5_set_error_message(context, ret, "samba_kdc_fetch: strdup() failed!");
1098                         return ret;
1099                 }
1100                 principal = alloc_principal;
1101
1102                 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1103                                         principal, SAMBA_KDC_ENT_TYPE_KRBTGT,
1104                                         realm_dn, msg, entry_ex);
1105                 if (ret != 0) {
1106                         krb5_warnx(context, "samba_kdc_fetch: self krbtgt message2entry failed");
1107                 }
1108                 return ret;
1109
1110         } else {
1111                 enum trust_direction direction = UNKNOWN;
1112
1113                 /* Either an inbound or outbound trust */
1114
1115                 if (strcasecmp(lpcfg_realm(lp_ctx), principal->realm) == 0) {
1116                         /* look for inbound trust */
1117                         direction = INBOUND;
1118                         realm = principal->name.name_string.val[1];
1119                 }
1120
1121                 if (strcasecmp(lpcfg_realm(lp_ctx), principal->name.name_string.val[1]) == 0) {
1122                         /* look for outbound trust */
1123                         direction = OUTBOUND;
1124                         realm = principal->realm;
1125                 }
1126
1127                 /* Trusted domains are under CN=system */
1128
1129                 ret = samba_kdc_lookup_trust(context, kdc_db_ctx->samdb,
1130                                        mem_ctx,
1131                                        realm, realm_dn, &msg);
1132
1133                 if (ret != 0) {
1134                         krb5_warnx(context, "samba_kdc_fetch: could not find principal in DB");
1135                         krb5_set_error_message(context, ret, "samba_kdc_fetch: could not find principal in DB");
1136                         return ret;
1137                 }
1138
1139                 ret = samba_kdc_trust_message2entry(context, kdc_db_ctx, mem_ctx,
1140                                               principal, direction,
1141                                               realm_dn, msg, entry_ex);
1142                 if (ret != 0) {
1143                         krb5_warnx(context, "samba_kdc_fetch: trust_message2entry failed");
1144                 }
1145                 return ret;
1146         }
1147
1148 }
1149
1150 static krb5_error_code samba_kdc_lookup_server(krb5_context context,
1151                                                 struct samba_kdc_db_context *kdc_db_ctx,
1152                                                 TALLOC_CTX *mem_ctx,
1153                                                 krb5_const_principal principal,
1154                                                 const char **attrs,
1155                                                 struct ldb_dn **realm_dn,
1156                                                 struct ldb_message **msg)
1157 {
1158         krb5_error_code ret;
1159         const char *realm;
1160         if (principal->name.name_string.len >= 2) {
1161                 /* 'normal server' case */
1162                 int ldb_ret;
1163                 NTSTATUS nt_status;
1164                 struct ldb_dn *user_dn;
1165                 char *principal_string;
1166
1167                 ret = krb5_unparse_name_flags(context, principal,
1168                                               KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1169                                               &principal_string);
1170                 if (ret != 0) {
1171                         return ret;
1172                 }
1173
1174                 /* At this point we may find the host is known to be
1175                  * in a different realm, so we should generate a
1176                  * referral instead */
1177                 nt_status = crack_service_principal_name(kdc_db_ctx->samdb,
1178                                                          mem_ctx, principal_string,
1179                                                          &user_dn, realm_dn);
1180                 free(principal_string);
1181
1182                 if (!NT_STATUS_IS_OK(nt_status)) {
1183                         return HDB_ERR_NOENTRY;
1184                 }
1185
1186                 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb,
1187                                           mem_ctx,
1188                                           msg, user_dn, LDB_SCOPE_BASE,
1189                                           attrs, DSDB_SEARCH_SHOW_EXTENDED_DN, "(objectClass=*)");
1190                 if (ldb_ret != LDB_SUCCESS) {
1191                         return HDB_ERR_NOENTRY;
1192                 }
1193
1194         } else {
1195                 int lret;
1196                 char *filter = NULL;
1197                 char *short_princ;
1198                 /* server as client principal case, but we must not lookup userPrincipalNames */
1199                 *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1200                 realm = krb5_principal_get_realm(context, principal);
1201
1202                 /* TODO: Check if it is our realm, otherwise give referall */
1203
1204                 ret = krb5_unparse_name_flags(context, principal,  KRB5_PRINCIPAL_UNPARSE_NO_REALM, &short_princ);
1205
1206                 if (ret != 0) {
1207                         krb5_set_error_message(context, ret, "samba_kdc_lookup_principal: could not parse principal");
1208                         krb5_warnx(context, "samba_kdc_lookup_principal: could not parse principal");
1209                         return ret;
1210                 }
1211
1212                 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx, msg,
1213                                        *realm_dn, LDB_SCOPE_SUBTREE,
1214                                        attrs,
1215                                        DSDB_SEARCH_SHOW_EXTENDED_DN,
1216                                        "(&(objectClass=user)(samAccountName=%s))",
1217                                        ldb_binary_encode_string(mem_ctx, short_princ));
1218                 free(short_princ);
1219                 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1220                         DEBUG(3, ("Failed find a entry for %s\n", filter));
1221                         return HDB_ERR_NOENTRY;
1222                 }
1223                 if (lret != LDB_SUCCESS) {
1224                         DEBUG(3, ("Failed single search for for %s - %s\n",
1225                                   filter, ldb_errstring(kdc_db_ctx->samdb)));
1226                         return HDB_ERR_NOENTRY;
1227                 }
1228         }
1229
1230         return 0;
1231 }
1232
1233 static krb5_error_code samba_kdc_fetch_server(krb5_context context,
1234                                                struct samba_kdc_db_context *kdc_db_ctx,
1235                                                TALLOC_CTX *mem_ctx,
1236                                                krb5_const_principal principal,
1237                                                hdb_entry_ex *entry_ex)
1238 {
1239         krb5_error_code ret;
1240         struct ldb_dn *realm_dn;
1241         struct ldb_message *msg;
1242
1243         ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, principal,
1244                                        server_attrs, &realm_dn, &msg);
1245         if (ret != 0) {
1246                 return ret;
1247         }
1248
1249         ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1250                                 principal, SAMBA_KDC_ENT_TYPE_SERVER,
1251                                 realm_dn, msg, entry_ex);
1252         if (ret != 0) {
1253                 krb5_warnx(context, "samba_kdc_fetch: message2entry failed");
1254         }
1255
1256         return ret;
1257 }
1258
1259 krb5_error_code samba_kdc_fetch(krb5_context context,
1260                                 struct samba_kdc_db_context *kdc_db_ctx,
1261                                 krb5_const_principal principal,
1262                                 unsigned flags,
1263                                 hdb_entry_ex *entry_ex)
1264 {
1265         krb5_error_code ret = HDB_ERR_NOENTRY;
1266         TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_fetch context");
1267
1268         if (!mem_ctx) {
1269                 ret = ENOMEM;
1270                 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1271                 return ret;
1272         }
1273
1274         if (flags & HDB_F_GET_CLIENT) {
1275                 ret = samba_kdc_fetch_client(context, kdc_db_ctx, mem_ctx, principal, entry_ex);
1276                 if (ret != HDB_ERR_NOENTRY) goto done;
1277         }
1278         if (flags & HDB_F_GET_SERVER) {
1279                 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
1280                 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, entry_ex);
1281                 if (ret != HDB_ERR_NOENTRY) goto done;
1282
1283                 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
1284                 ret = samba_kdc_fetch_server(context, kdc_db_ctx, mem_ctx, principal, entry_ex);
1285                 if (ret != HDB_ERR_NOENTRY) goto done;
1286         }
1287         if (flags & HDB_F_GET_KRBTGT) {
1288                 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, entry_ex);
1289                 if (ret != HDB_ERR_NOENTRY) goto done;
1290         }
1291
1292 done:
1293         talloc_free(mem_ctx);
1294         return ret;
1295 }
1296
1297 struct samba_kdc_seq {
1298         unsigned int index;
1299         unsigned int count;
1300         struct ldb_message **msgs;
1301         struct ldb_dn *realm_dn;
1302 };
1303
1304 static krb5_error_code samba_kdc_seq(krb5_context context,
1305                                      struct samba_kdc_db_context *kdc_db_ctx,
1306                                      hdb_entry_ex *entry)
1307 {
1308         krb5_error_code ret;
1309         struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
1310         TALLOC_CTX *mem_ctx;
1311         hdb_entry_ex entry_ex;
1312         memset(&entry_ex, '\0', sizeof(entry_ex));
1313
1314         if (!priv) {
1315                 return HDB_ERR_NOENTRY;
1316         }
1317
1318         mem_ctx = talloc_named(priv, 0, "samba_kdc_seq context");
1319
1320         if (!mem_ctx) {
1321                 ret = ENOMEM;
1322                 krb5_set_error_message(context, ret, "samba_kdc_seq: talloc_named() failed!");
1323                 return ret;
1324         }
1325
1326         if (priv->index < priv->count) {
1327                 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1328                                         NULL, SAMBA_KDC_ENT_TYPE_ANY,
1329                                         priv->realm_dn, priv->msgs[priv->index++], entry);
1330         } else {
1331                 ret = HDB_ERR_NOENTRY;
1332         }
1333
1334         if (ret != 0) {
1335                 TALLOC_FREE(priv);
1336                 kdc_db_ctx->seq_ctx = NULL;
1337         } else {
1338                 talloc_free(mem_ctx);
1339         }
1340
1341         return ret;
1342 }
1343
1344 krb5_error_code samba_kdc_firstkey(krb5_context context,
1345                                    struct samba_kdc_db_context *kdc_db_ctx,
1346                                    hdb_entry_ex *entry)
1347 {
1348         struct ldb_context *ldb_ctx = kdc_db_ctx->samdb;
1349         struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
1350         char *realm;
1351         struct ldb_result *res = NULL;
1352         krb5_error_code ret;
1353         TALLOC_CTX *mem_ctx;
1354         int lret;
1355
1356         if (priv) {
1357                 TALLOC_FREE(priv);
1358                 kdc_db_ctx->seq_ctx = NULL;
1359         }
1360
1361         priv = (struct samba_kdc_seq *) talloc(kdc_db_ctx, struct samba_kdc_seq);
1362         if (!priv) {
1363                 ret = ENOMEM;
1364                 krb5_set_error_message(context, ret, "talloc: out of memory");
1365                 return ret;
1366         }
1367
1368         priv->index = 0;
1369         priv->msgs = NULL;
1370         priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
1371         priv->count = 0;
1372
1373         mem_ctx = talloc_named(priv, 0, "samba_kdc_firstkey context");
1374
1375         if (!mem_ctx) {
1376                 ret = ENOMEM;
1377                 krb5_set_error_message(context, ret, "samba_kdc_firstkey: talloc_named() failed!");
1378                 return ret;
1379         }
1380
1381         ret = krb5_get_default_realm(context, &realm);
1382         if (ret != 0) {
1383                 TALLOC_FREE(priv);
1384                 return ret;
1385         }
1386
1387         lret = ldb_search(ldb_ctx, priv, &res,
1388                           priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
1389                           "(objectClass=user)");
1390
1391         if (lret != LDB_SUCCESS) {
1392                 TALLOC_FREE(priv);
1393                 return HDB_ERR_NOENTRY;
1394         }
1395
1396         priv->count = res->count;
1397         priv->msgs = talloc_steal(priv, res->msgs);
1398         talloc_free(res);
1399
1400         kdc_db_ctx->seq_ctx = priv;
1401
1402         ret = samba_kdc_seq(context, kdc_db_ctx, entry);
1403
1404         if (ret != 0) {
1405                 TALLOC_FREE(priv);
1406                 kdc_db_ctx->seq_ctx = NULL;
1407         } else {
1408                 talloc_free(mem_ctx);
1409         }
1410         return ret;
1411 }
1412
1413 krb5_error_code samba_kdc_nextkey(krb5_context context,
1414                                   struct samba_kdc_db_context *kdc_db_ctx,
1415                                   hdb_entry_ex *entry)
1416 {
1417         return samba_kdc_seq(context, kdc_db_ctx, entry);
1418 }
1419
1420 /* Check if a given entry may delegate or do s4u2self to this target principal
1421  *
1422  * This is currently a very nasty hack - allowing only delegation to itself.
1423  *
1424  * This is shared between the constrained delegation and S4U2Self code.
1425  */
1426 krb5_error_code
1427 samba_kdc_check_identical_client_and_server(krb5_context context,
1428                                             struct samba_kdc_db_context *kdc_db_ctx,
1429                                             hdb_entry_ex *entry,
1430                                             krb5_const_principal target_principal)
1431 {
1432         krb5_error_code ret;
1433         krb5_principal enterprise_prinicpal = NULL;
1434         struct ldb_dn *realm_dn;
1435         struct ldb_message *msg;
1436         struct dom_sid *orig_sid;
1437         struct dom_sid *target_sid;
1438         struct samba_kdc_entry *p = talloc_get_type(entry->ctx, struct samba_kdc_entry);
1439         const char *delegation_check_attrs[] = {
1440                 "objectSid", NULL
1441         };
1442
1443         TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_constrained_delegation");
1444
1445         if (!mem_ctx) {
1446                 ret = ENOMEM;
1447                 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1448                 return ret;
1449         }
1450
1451         if (target_principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1452                 /* Need to reparse the enterprise principal to find the real target */
1453                 if (target_principal->name.name_string.len != 1) {
1454                         ret = KRB5_PARSE_MALFORMED;
1455                         krb5_set_error_message(context, ret, "samba_kdc_check_constrained_delegation: request for delegation to enterprise principal with wrong (%d) number of components",
1456                                                target_principal->name.name_string.len);
1457                         talloc_free(mem_ctx);
1458                         return ret;
1459                 }
1460                 ret = krb5_parse_name(context, target_principal->name.name_string.val[0],
1461                                       &enterprise_prinicpal);
1462                 if (ret) {
1463                         talloc_free(mem_ctx);
1464                         return ret;
1465                 }
1466                 target_principal = enterprise_prinicpal;
1467         }
1468
1469         ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, target_principal,
1470                                        delegation_check_attrs, &realm_dn, &msg);
1471
1472         krb5_free_principal(context, enterprise_prinicpal);
1473
1474         if (ret != 0) {
1475                 talloc_free(mem_ctx);
1476                 return ret;
1477         }
1478
1479         orig_sid = samdb_result_dom_sid(mem_ctx, p->msg, "objectSid");
1480         target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
1481
1482         /* Allow delegation to the same principal, even if by a different
1483          * name.  The easy and safe way to prove this is by SID
1484          * comparison */
1485         if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
1486                 talloc_free(mem_ctx);
1487                 return KRB5KDC_ERR_BADOPTION;
1488         }
1489
1490         talloc_free(mem_ctx);
1491         return ret;
1492 }
1493
1494 /* Certificates printed by a the Certificate Authority might have a
1495  * slightly different form of the user principal name to that in the
1496  * database.  Allow a mismatch where they both refer to the same
1497  * SID */
1498
1499 krb5_error_code
1500 samba_kdc_check_pkinit_ms_upn_match(krb5_context context,
1501                                     struct samba_kdc_db_context *kdc_db_ctx,
1502                                      hdb_entry_ex *entry,
1503                                      krb5_const_principal certificate_principal)
1504 {
1505         krb5_error_code ret;
1506         struct ldb_dn *realm_dn;
1507         struct ldb_message *msg;
1508         struct dom_sid *orig_sid;
1509         struct dom_sid *target_sid;
1510         struct samba_kdc_entry *p = talloc_get_type(entry->ctx, struct samba_kdc_entry);
1511         const char *ms_upn_check_attrs[] = {
1512                 "objectSid", NULL
1513         };
1514
1515         TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_pkinit_ms_upn_match");
1516
1517         if (!mem_ctx) {
1518                 ret = ENOMEM;
1519                 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1520                 return ret;
1521         }
1522
1523         ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1524                                        mem_ctx, certificate_principal,
1525                                        ms_upn_check_attrs, &realm_dn, &msg);
1526
1527         if (ret != 0) {
1528                 talloc_free(mem_ctx);
1529                 return ret;
1530         }
1531
1532         orig_sid = samdb_result_dom_sid(mem_ctx, p->msg, "objectSid");
1533         target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
1534
1535         /* Consider these to be the same principal, even if by a different
1536          * name.  The easy and safe way to prove this is by SID
1537          * comparison */
1538         if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
1539                 talloc_free(mem_ctx);
1540                 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1541         }
1542
1543         talloc_free(mem_ctx);
1544         return ret;
1545 }
1546