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 <hdb.h>
  44 #include "kdc/samba_kdc.h"
  45 #include "kdc/db-glue.h"
  46
  47 enum samba_kdc_ent_type
  48 { SAMBA_KDC_ENT_TYPE_CLIENT, SAMBA_KDC_ENT_TYPE_SERVER,
  49   SAMBA_KDC_ENT_TYPE_KRBTGT, SAMBA_KDC_ENT_TYPE_TRUST, SAMBA_KDC_ENT_TYPE_ANY };
  50
  51 enum trust_direction {
  52         UNKNOWN = 0,
  53         INBOUND = LSA_TRUST_DIRECTION_INBOUND,
  54         OUTBOUND = LSA_TRUST_DIRECTION_OUTBOUND
  55 };
  56
  57 static const char *trust_attrs[] = {
  58         "trustPartner",
  59         "trustAuthIncoming",
  60         "trustAuthOutgoing",
  61         "whenCreated",
  62         "msDS-SupportedEncryptionTypes",
  63         "trustAttributes",
  64         "trustDirection",
  65         "trustType",
  66         NULL
  67 };
  68
  69 static KerberosTime ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, KerberosTime default_val)
  70 {
  71     const char *tmp;
  72     const char *gentime;
  73     struct tm tm;
  74
  75     gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
  76     if (!gentime)
  77         return default_val;
  78
  79     tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
  80     if (tmp == NULL) {
  81             return default_val;
  82     }
  83
  84     return timegm(&tm);
  85 }
  86
  87 static HDBFlags uf2HDBFlags(krb5_context context, int userAccountControl, enum samba_kdc_ent_type ent_type)
  88 {
  89         HDBFlags flags = int2HDBFlags(0);
  90
  91         /* we don't allow kadmin deletes */
  92         flags.immutable = 1;
  93
  94         /* mark the principal as invalid to start with */
  95         flags.invalid = 1;
  96
  97         flags.renewable = 1;
  98
  99         /* All accounts are servers, but this may be disabled again in the caller */
 100         flags.server = 1;
 101
 102         /* Account types - clear the invalid bit if it turns out to be valid */
 103         if (userAccountControl & UF_NORMAL_ACCOUNT) {
 104                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
 105                         flags.client = 1;
 106                 }
 107                 flags.invalid = 0;
 108         }
 109
 110         if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
 111                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
 112                         flags.client = 1;
 113                 }
 114                 flags.invalid = 0;
 115         }
 116         if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
 117                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
 118                         flags.client = 1;
 119                 }
 120                 flags.invalid = 0;
 121         }
 122         if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
 123                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
 124                         flags.client = 1;
 125                 }
 126                 flags.invalid = 0;
 127         }
 128
 129         /* Not permitted to act as a client if disabled */
 130         if (userAccountControl & UF_ACCOUNTDISABLE) {
 131                 flags.client = 0;
 132         }
 133         if (userAccountControl & UF_LOCKOUT) {
 134                 flags.invalid = 1;
 135         }
 136 /*
 137         if (userAccountControl & UF_PASSWORD_NOTREQD) {
 138                 flags.invalid = 1;
 139         }
 140 */
 141 /*
 142         UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
 143 */
 144         if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
 145                 flags.invalid = 1;
 146         }
 147
 148 /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in samba_kdc_message2entry() */
 149
 150 /*
 151         if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
 152                 flags.invalid = 1;
 153         }
 154 */
 155         if (userAccountControl & UF_SMARTCARD_REQUIRED) {
 156                 flags.require_hwauth = 1;
 157         }
 158         if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
 159                 flags.ok_as_delegate = 1;
 160         }
 161         if (!(userAccountControl & UF_NOT_DELEGATED)) {
 162                 flags.forwardable = 1;
 163                 flags.proxiable = 1;
 164         }
 165
 166         if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
 167                 flags.require_preauth = 0;
 168         } else {
 169                 flags.require_preauth = 1;
 170
 171         }
 172         return flags;
 173 }
 174
 175 static int samba_kdc_entry_destructor(struct samba_kdc_entry *p)
 176 {
 177     hdb_entry_ex *entry_ex = p->entry_ex;
 178     free_hdb_entry(&entry_ex->entry);
 179     return 0;
 180 }
 181
 182 static void samba_kdc_free_entry(krb5_context context, hdb_entry_ex *entry_ex)
 183 {
 184         /* this function is called only from hdb_free_entry().
 185          * Make sure we neutralize the destructor or we will
 186          * get a double free later when hdb_free_entry() will
 187          * try to call free_hdb_entry() */
 188         talloc_set_destructor(entry_ex->ctx, NULL);
 189
 190         /* now proceed to free the talloc part */
 191         talloc_free(entry_ex->ctx);
 192 }
 193
 194 static krb5_error_code samba_kdc_message2entry_keys(krb5_context context,
 195                                               TALLOC_CTX *mem_ctx,
 196                                               struct ldb_message *msg,
 197                                               unsigned int userAccountControl,
 198                                               hdb_entry_ex *entry_ex)
 199 {
 200         krb5_error_code ret = 0;
 201         enum ndr_err_code ndr_err;
 202         struct samr_Password *hash;
 203         const struct ldb_val *sc_val;
 204         struct supplementalCredentialsBlob scb;
 205         struct supplementalCredentialsPackage *scpk = NULL;
 206         bool newer_keys = false;
 207         struct package_PrimaryKerberosBlob _pkb;
 208         struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
 209         struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
 210         uint16_t i;
 211         uint16_t allocated_keys = 0;
 212
 213         entry_ex->entry.keys.val = NULL;
 214         entry_ex->entry.keys.len = 0;
 215
 216         entry_ex->entry.kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
 217
 218         /* Get keys from the db */
 219
 220         hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
 221         sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
 222
 223         /* unicodePwd for enctype 0x17 (23) if present */
 224         if (hash) {
 225                 allocated_keys++;
 226         }
 227
 228         /* supplementalCredentials if present */
 229         if (sc_val) {
 230                 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, &scb,
 231                                                    (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
 232                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 233                         dump_data(0, sc_val->data, sc_val->length);
 234                         ret = EINVAL;
 235                         goto out;
 236                 }
 237
 238                 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
 239                         NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
 240                         ret = EINVAL;
 241                         goto out;
 242                 }
 243
 244                 for (i=0; i < scb.sub.num_packages; i++) {
 245                         if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
 246                                 scpk = &scb.sub.packages[i];
 247                                 if (!scpk->data || !scpk->data[0]) {
 248                                         scpk = NULL;
 249                                         continue;
 250                                 }
 251                                 newer_keys = true;
 252                                 break;
 253                         } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
 254                                 scpk = &scb.sub.packages[i];
 255                                 if (!scpk->data || !scpk->data[0]) {
 256                                         scpk = NULL;
 257                                 }
 258                                 /*
 259                                  * we don't break here in hope to find
 260                                  * a Kerberos-Newer-Keys package
 261                                  */
 262                         }
 263                 }
 264         }
 265         /*
 266          * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
 267          * of supplementalCredentials
 268          */
 269         if (scpk) {
 270                 DATA_BLOB blob;
 271
 272                 blob = strhex_to_data_blob(mem_ctx, scpk->data);
 273                 if (!blob.data) {
 274                         ret = ENOMEM;
 275                         goto out;
 276                 }
 277
 278                 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
 279                 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &_pkb,
 280                                                (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
 281                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 282                         ret = EINVAL;
 283                         krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 284                         krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
 285                         goto out;
 286                 }
 287
 288                 if (newer_keys && _pkb.version != 4) {
 289                         ret = EINVAL;
 290                         krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 291                         krb5_warnx(context, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
 292                         goto out;
 293                 }
 294
 295                 if (!newer_keys && _pkb.version != 3) {
 296                         ret = EINVAL;
 297                         krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
 298                         krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
 299                         goto out;
 300                 }
 301
 302                 if (_pkb.version == 4) {
 303                         pkb4 = &_pkb.ctr.ctr4;
 304                         allocated_keys += pkb4->num_keys;
 305                 } else if (_pkb.version == 3) {
 306                         pkb3 = &_pkb.ctr.ctr3;
 307                         allocated_keys += pkb3->num_keys;
 308                 }
 309         }
 310
 311         if (allocated_keys == 0) {
 312                 /* oh, no password.  Apparently (comment in
 313                  * hdb-ldap.c) this violates the ASN.1, but this
 314                  * allows an entry with no keys (yet). */
 315                 return 0;
 316         }
 317
 318         /* allocate space to decode into */
 319         entry_ex->entry.keys.len = 0;
 320         entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(Key));
 321         if (entry_ex->entry.keys.val == NULL) {
 322                 ret = ENOMEM;
 323                 goto out;
 324         }
 325
 326         if (hash && !(userAccountControl & UF_USE_DES_KEY_ONLY)) {
 327                 Key key;
 328
 329                 key.mkvno = 0;
 330                 key.salt = NULL; /* No salt for this enc type */
 331
 332                 ret = krb5_keyblock_init(context,
 333                                          ENCTYPE_ARCFOUR_HMAC,
 334                                          hash->hash, sizeof(hash->hash),
 335                                          &key.key);
 336                 if (ret) {
 337                         goto out;
 338                 }
 339
 340                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 341                 entry_ex->entry.keys.len++;
 342         }
 343
 344         if (pkb4) {
 345                 for (i=0; i < pkb4->num_keys; i++) {
 346                         bool use = true;
 347                         Key key;
 348
 349                         if (!pkb4->keys[i].value) continue;
 350
 351                         if (userAccountControl & UF_USE_DES_KEY_ONLY) {
 352                                 switch (pkb4->keys[i].keytype) {
 353                                 case ENCTYPE_DES_CBC_CRC:
 354                                 case ENCTYPE_DES_CBC_MD5:
 355                                         break;
 356                                 default:
 357                                         use = false;
 358                                         break;
 359                                 }
 360                         }
 361
 362                         if (!use) continue;
 363
 364                         key.mkvno = 0;
 365                         key.salt = NULL;
 366
 367                         if (pkb4->salt.string) {
 368                                 DATA_BLOB salt;
 369
 370                                 salt = data_blob_string_const(pkb4->salt.string);
 371
 372                                 key.salt = calloc(1, sizeof(*key.salt));
 373                                 if (key.salt == NULL) {
 374                                         ret = ENOMEM;
 375                                         goto out;
 376                                 }
 377
 378                                 key.salt->type = hdb_pw_salt;
 379
 380                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
 381                                 if (ret) {
 382                                         free(key.salt);
 383                                         key.salt = NULL;
 384                                         goto out;
 385                                 }
 386                         }
 387
 388                         /* TODO: maybe pass the iteration_count somehow... */
 389
 390                         ret = krb5_keyblock_init(context,
 391                                                  pkb4->keys[i].keytype,
 392                                                  pkb4->keys[i].value->data,
 393                                                  pkb4->keys[i].value->length,
 394                                                  &key.key);
 395                         if (ret == KRB5_PROG_ETYPE_NOSUPP) {
 396                                 DEBUG(2,("Unsupported keytype ignored - type %u\n",
 397                                          pkb4->keys[i].keytype));
 398                                 ret = 0;
 399                                 continue;
 400                         }
 401                         if (ret) {
 402                                 if (key.salt) {
 403                                         free_Salt(key.salt);
 404                                         free(key.salt);
 405                                         key.salt = NULL;
 406                                 }
 407                                 goto out;
 408                         }
 409
 410                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 411                         entry_ex->entry.keys.len++;
 412                 }
 413         } else if (pkb3) {
 414                 for (i=0; i < pkb3->num_keys; i++) {
 415                         bool use = true;
 416                         Key key;
 417
 418                         if (!pkb3->keys[i].value) continue;
 419
 420                         if (userAccountControl & UF_USE_DES_KEY_ONLY) {
 421                                 switch (pkb3->keys[i].keytype) {
 422                                 case ENCTYPE_DES_CBC_CRC:
 423                                 case ENCTYPE_DES_CBC_MD5:
 424                                         break;
 425                                 default:
 426                                         use = false;
 427                                         break;
 428                                 }
 429                         }
 430
 431                         if (!use) continue;
 432
 433                         key.mkvno = 0;
 434                         key.salt = NULL;
 435
 436                         if (pkb3->salt.string) {
 437                                 DATA_BLOB salt;
 438
 439                                 salt = data_blob_string_const(pkb3->salt.string);
 440
 441                                 key.salt = calloc(1, sizeof(*key.salt));
 442                                 if (key.salt == NULL) {
 443                                         ret = ENOMEM;
 444                                         goto out;
 445                                 }
 446
 447                                 key.salt->type = hdb_pw_salt;
 448
 449                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
 450                                 if (ret) {
 451                                         free(key.salt);
 452                                         key.salt = NULL;
 453                                         goto out;
 454                                 }
 455                         }
 456
 457                         ret = krb5_keyblock_init(context,
 458                                                  pkb3->keys[i].keytype,
 459                                                  pkb3->keys[i].value->data,
 460                                                  pkb3->keys[i].value->length,
 461                                                  &key.key);
 462                         if (ret) {
 463                                 if (key.salt) {
 464                                         free_Salt(key.salt);
 465                                         free(key.salt);
 466                                         key.salt = NULL;
 467                                 }
 468                                 goto out;
 469                         }
 470
 471                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 472                         entry_ex->entry.keys.len++;
 473                 }
 474         }
 475
 476 out:
 477         if (ret != 0) {
 478                 entry_ex->entry.keys.len = 0;
 479         }
 480         if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
 481                 free(entry_ex->entry.keys.val);
 482                 entry_ex->entry.keys.val = NULL;
 483         }
 484         return ret;
 485 }
 486
 487 /*
 488  * Construct an hdb_entry from a directory entry.
 489  */
 490 static krb5_error_code samba_kdc_message2entry(krb5_context context,
 491                                          struct samba_kdc_db_context *kdc_db_ctx,
 492                                          TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 493                                          enum samba_kdc_ent_type ent_type,
 494                                          struct ldb_dn *realm_dn,
 495                                          struct ldb_message *msg,
 496                                          hdb_entry_ex *entry_ex)
 497 {
 498         struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
 499         unsigned int userAccountControl;
 500         unsigned int i;
 501         krb5_error_code ret = 0;
 502         krb5_boolean is_computer = FALSE;
 503         char *realm = strupper_talloc(mem_ctx, lp_realm(lp_ctx));
 504
 505         struct samba_kdc_entry *p;
 506         NTTIME acct_expiry;
 507         NTSTATUS status;
 508
 509         uint32_t rid;
 510         struct ldb_message_element *objectclasses;
 511         struct ldb_val computer_val;
 512         const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
 513         computer_val.data = discard_const_p(uint8_t,"computer");
 514         computer_val.length = strlen((const char *)computer_val.data);
 515
 516         if (!samAccountName) {
 517                 ret = ENOENT;
 518                 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no samAccountName present");
 519                 goto out;
 520         }
 521
 522         objectclasses = ldb_msg_find_element(msg, "objectClass");
 523
 524         if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
 525                 is_computer = TRUE;
 526         }
 527
 528         memset(entry_ex, 0, sizeof(*entry_ex));
 529
 530         if (!realm) {
 531                 ret = ENOMEM;
 532                 krb5_set_error_message(context, ret, "talloc_strdup: out of memory");
 533                 goto out;
 534         }
 535
 536         p = talloc(mem_ctx, struct samba_kdc_entry);
 537         if (!p) {
 538                 ret = ENOMEM;
 539                 goto out;
 540         }
 541
 542         p->kdc_db_ctx = kdc_db_ctx;
 543         p->entry_ex = entry_ex;
 544         p->realm_dn = talloc_reference(p, realm_dn);
 545         if (!p->realm_dn) {
 546                 ret = ENOMEM;
 547                 goto out;
 548         }
 549
 550         talloc_set_destructor(p, samba_kdc_entry_destructor);
 551
 552         /* make sure we do not have bogus data in there */
 553         memset(&entry_ex->entry, 0, sizeof(hdb_entry));
 554
 555         entry_ex->ctx = p;
 556         entry_ex->free_entry = samba_kdc_free_entry;
 557
 558         userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
 559
 560
 561         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 562         if (ent_type == SAMBA_KDC_ENT_TYPE_ANY && principal == NULL) {
 563                 krb5_make_principal(context, &entry_ex->entry.principal, realm, samAccountName, NULL);
 564         } else {
 565                 ret = copy_Principal(principal, entry_ex->entry.principal);
 566                 if (ret) {
 567                         krb5_clear_error_message(context);
 568                         goto out;
 569                 }
 570
 571                 /* While we have copied the client principal, tests
 572                  * show that Win2k3 returns the 'corrected' realm, not
 573                  * the client-specified realm.  This code attempts to
 574                  * replace the client principal's realm with the one
 575                  * we determine from our records */
 576
 577                 /* this has to be with malloc() */
 578                 krb5_principal_set_realm(context, entry_ex->entry.principal, realm);
 579         }
 580
 581         /* First try and figure out the flags based on the userAccountControl */
 582         entry_ex->entry.flags = uf2HDBFlags(context, userAccountControl, ent_type);
 583
 584         /* Windows 2008 seems to enforce this (very sensible) rule by
 585          * default - don't allow offline attacks on a user's password
 586          * by asking for a ticket to them as a service (encrypted with
 587          * their probably patheticly insecure password) */
 588
 589         if (entry_ex->entry.flags.server
 590             && lp_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
 591                 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
 592                         entry_ex->entry.flags.server = 0;
 593                 }
 594         }
 595
 596         {
 597                 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
 598                  * of the Heimdal KDC.  They are stored in a the traditional
 599                  * DB for audit purposes, and still form part of the structure
 600                  * we must return */
 601
 602                 /* use 'whenCreated' */
 603                 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 604                 /* use 'kadmin' for now (needed by mit_samba) */
 605                 krb5_make_principal(context,
 606                                     &entry_ex->entry.created_by.principal,
 607                                     realm, "kadmin", NULL);
 608
 609                 entry_ex->entry.modified_by = (Event *) malloc(sizeof(Event));
 610                 if (entry_ex->entry.modified_by == NULL) {
 611                         ret = ENOMEM;
 612                         krb5_set_error_message(context, ret, "malloc: out of memory");
 613                         goto out;
 614                 }
 615
 616                 /* use 'whenChanged' */
 617                 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
 618                 /* use 'kadmin' for now (needed by mit_samba) */
 619                 krb5_make_principal(context,
 620                                     &entry_ex->entry.modified_by->principal,
 621                                     realm, "kadmin", NULL);
 622         }
 623
 624
 625         /* The lack of password controls etc applies to krbtgt by
 626          * virtue of being that particular RID */
 627         status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
 628
 629         if (!NT_STATUS_IS_OK(status)) {
 630                 ret = EINVAL;
 631                 goto out;
 632         }
 633
 634         if (rid == DOMAIN_RID_KRBTGT) {
 635                 entry_ex->entry.valid_end = NULL;
 636                 entry_ex->entry.pw_end = NULL;
 637
 638                 entry_ex->entry.flags.invalid = 0;
 639                 entry_ex->entry.flags.server = 1;
 640
 641                 /* Don't mark all requests for the krbtgt/realm as
 642                  * 'change password', as otherwise we could get into
 643                  * trouble, and not enforce the password expirty.
 644                  * Instead, only do it when request is for the kpasswd service */
 645                 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER
 646                     && principal->name.name_string.len == 2
 647                     && (strcmp(principal->name.name_string.val[0], "kadmin") == 0)
 648                     && (strcmp(principal->name.name_string.val[1], "changepw") == 0)
 649                     && lp_is_my_domain_or_realm(lp_ctx, principal->realm)) {
 650                         entry_ex->entry.flags.change_pw = 1;
 651                 }
 652                 entry_ex->entry.flags.client = 0;
 653                 entry_ex->entry.flags.forwardable = 1;
 654                 entry_ex->entry.flags.ok_as_delegate = 1;
 655         } else if (entry_ex->entry.flags.server && ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
 656                 /* The account/password expiry only applies when the account is used as a
 657                  * client (ie password login), not when used as a server */
 658
 659                 /* Make very well sure we don't use this for a client,
 660                  * it could bypass the password restrictions */
 661                 entry_ex->entry.flags.client = 0;
 662
 663                 entry_ex->entry.valid_end = NULL;
 664                 entry_ex->entry.pw_end = NULL;
 665
 666         } else {
 667                 NTTIME must_change_time
 668                         = samdb_result_force_password_change(kdc_db_ctx->samdb, mem_ctx,
 669                                                              realm_dn, msg);
 670                 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
 671                         entry_ex->entry.pw_end = NULL;
 672                 } else {
 673                         entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
 674                         if (entry_ex->entry.pw_end == NULL) {
 675                                 ret = ENOMEM;
 676                                 goto out;
 677                         }
 678                         *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
 679                 }
 680
 681                 acct_expiry = samdb_result_account_expires(msg);
 682                 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
 683                         entry_ex->entry.valid_end = NULL;
 684                 } else {
 685                         entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
 686                         if (entry_ex->entry.valid_end == NULL) {
 687                                 ret = ENOMEM;
 688                                 goto out;
 689                         }
 690                         *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
 691                 }
 692         }
 693
 694         entry_ex->entry.valid_start = NULL;
 695
 696         entry_ex->entry.max_life = NULL;
 697
 698         entry_ex->entry.max_renew = NULL;
 699
 700         entry_ex->entry.generation = NULL;
 701
 702         /* Get keys from the db */
 703         ret = samba_kdc_message2entry_keys(context, p, msg, userAccountControl,
 704                                                                            entry_ex);
 705         if (ret) {
 706                 /* Could be bougus data in the entry, or out of memory */
 707                 goto out;
 708         }
 709
 710         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 711         if (entry_ex->entry.etypes == NULL) {
 712                 krb5_clear_error_message(context);
 713                 ret = ENOMEM;
 714                 goto out;
 715         }
 716         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 717         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 718         if (entry_ex->entry.etypes->val == NULL) {
 719                 krb5_clear_error_message(context);
 720                 ret = ENOMEM;
 721                 goto out;
 722         }
 723         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 724                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 725         }
 726
 727
 728         p->msg = talloc_steal(p, msg);
 729
 730 out:
 731         if (ret != 0) {
 732                 /* This doesn't free ent itself, that is for the eventual caller to do */
 733                 hdb_free_entry(context, entry_ex);
 734         } else {
 735                 talloc_steal(kdc_db_ctx, entry_ex->ctx);
 736         }
 737
 738         return ret;
 739 }
 740
 741 /*
 742  * Construct an hdb_entry from a directory entry.
 743  */
 744 static krb5_error_code samba_kdc_trust_message2entry(krb5_context context,
 745                                                struct samba_kdc_db_context *kdc_db_ctx,
 746                                                TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 747                                                enum trust_direction direction,
 748                                                struct ldb_dn *realm_dn,
 749                                                struct ldb_message *msg,
 750                                                hdb_entry_ex *entry_ex)
 751 {
 752         struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
 753         const char *dnsdomain;
 754         char *realm = strupper_talloc(mem_ctx, lp_realm(lp_ctx));
 755         DATA_BLOB password_utf16;
 756         struct samr_Password password_hash;
 757         const struct ldb_val *password_val;
 758         struct trustAuthInOutBlob password_blob;
 759         struct samba_kdc_entry *p;
 760
 761         enum ndr_err_code ndr_err;
 762         int ret, trust_direction_flags;
 763         unsigned int i;
 764
 765         p = talloc(mem_ctx, struct samba_kdc_entry);
 766         if (!p) {
 767                 ret = ENOMEM;
 768                 goto out;
 769         }
 770
 771         p->kdc_db_ctx = kdc_db_ctx;
 772         p->entry_ex = entry_ex;
 773         p->realm_dn = realm_dn;
 774
 775         talloc_set_destructor(p, samba_kdc_entry_destructor);
 776
 777         /* make sure we do not have bogus data in there */
 778         memset(&entry_ex->entry, 0, sizeof(hdb_entry));
 779
 780         entry_ex->ctx = p;
 781         entry_ex->free_entry = samba_kdc_free_entry;
 782
 783         /* use 'whenCreated' */
 784         entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 785         /* use 'kadmin' for now (needed by mit_samba) */
 786         krb5_make_principal(context,
 787                             &entry_ex->entry.created_by.principal,
 788                             realm, "kadmin", NULL);
 789
 790         entry_ex->entry.valid_start = NULL;
 791
 792         trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
 793
 794         if (direction == INBOUND) {
 795                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
 796
 797         } else { /* OUTBOUND */
 798                 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
 799                 /* replace realm */
 800                 talloc_free(realm);
 801                 realm = strupper_talloc(mem_ctx, dnsdomain);
 802                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
 803         }
 804
 805         if (!password_val || !(trust_direction_flags & direction)) {
 806                 ret = ENOENT;
 807                 goto out;
 808         }
 809
 810         ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, &password_blob,
 811                                            (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
 812         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 813                 ret = EINVAL;
 814                 goto out;
 815         }
 816
 817         entry_ex->entry.kvno = -1;
 818         for (i=0; i < password_blob.count; i++) {
 819                 if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_VERSION) {
 820                         entry_ex->entry.kvno = password_blob.current->array[i].AuthInfo.version.version;
 821                 }
 822         }
 823
 824         for (i=0; i < password_blob.count; i++) {
 825                 if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
 826                         password_utf16 = data_blob_const(password_blob.current->array[i].AuthInfo.clear.password,
 827                                                          password_blob.current->array[i].AuthInfo.clear.size);
 828                         /* In the future, generate all sorts of
 829                          * hashes, but for now we can't safely convert
 830                          * the random strings windows uses into
 831                          * utf8 */
 832
 833                         /* but as it is utf16 already, we can get the NT password/arcfour-hmac-md5 key */
 834                         mdfour(password_hash.hash, password_utf16.data, password_utf16.length);
 835                         break;
 836                 } else if (password_blob.current->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
 837                         password_hash = password_blob.current->array[i].AuthInfo.nt4owf.password;
 838                         break;
 839                 }
 840         }
 841
 842         if (i < password_blob.count) {
 843                 Key key;
 844                 /* Must have found a cleartext or MD4 password */
 845                 entry_ex->entry.keys.val = calloc(1, sizeof(Key));
 846
 847                 key.mkvno = 0;
 848                 key.salt = NULL; /* No salt for this enc type */
 849
 850                 if (entry_ex->entry.keys.val == NULL) {
 851                         ret = ENOMEM;
 852                         goto out;
 853                 }
 854
 855                 ret = krb5_keyblock_init(context,
 856                                          ENCTYPE_ARCFOUR_HMAC,
 857                                          password_hash.hash, sizeof(password_hash.hash),
 858                                          &key.key);
 859
 860                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
 861                 entry_ex->entry.keys.len++;
 862         }
 863
 864         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 865
 866         ret = copy_Principal(principal, entry_ex->entry.principal);
 867         if (ret) {
 868                 krb5_clear_error_message(context);
 869                 goto out;
 870         }
 871
 872         /* While we have copied the client principal, tests
 873          * show that Win2k3 returns the 'corrected' realm, not
 874          * the client-specified realm.  This code attempts to
 875          * replace the client principal's realm with the one
 876          * we determine from our records */
 877
 878         krb5_principal_set_realm(context, entry_ex->entry.principal, realm);
 879         entry_ex->entry.flags = int2HDBFlags(0);
 880         entry_ex->entry.flags.immutable = 1;
 881         entry_ex->entry.flags.invalid = 0;
 882         entry_ex->entry.flags.server = 1;
 883         entry_ex->entry.flags.require_preauth = 1;
 884
 885         entry_ex->entry.pw_end = NULL;
 886
 887         entry_ex->entry.max_life = NULL;
 888
 889         entry_ex->entry.max_renew = NULL;
 890
 891         entry_ex->entry.generation = NULL;
 892
 893         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 894         if (entry_ex->entry.etypes == NULL) {
 895                 krb5_clear_error_message(context);
 896                 ret = ENOMEM;
 897                 goto out;
 898         }
 899         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 900         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 901         if (entry_ex->entry.etypes->val == NULL) {
 902                 krb5_clear_error_message(context);
 903                 ret = ENOMEM;
 904                 goto out;
 905         }
 906         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 907                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 908         }
 909
 910
 911         p->msg = talloc_steal(p, msg);
 912
 913 out:
 914         if (ret != 0) {
 915                 /* This doesn't free ent itself, that is for the eventual caller to do */
 916                 hdb_free_entry(context, entry_ex);
 917         } else {
 918                 talloc_steal(kdc_db_ctx, entry_ex->ctx);
 919         }
 920
 921         return ret;
 922
 923 }
 924
 925 static krb5_error_code samba_kdc_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
 926                                         TALLOC_CTX *mem_ctx,
 927                                         const char *realm,
 928                                         struct ldb_dn *realm_dn,
 929                                         struct ldb_message **pmsg)
 930 {
 931         int lret;
 932         krb5_error_code ret;
 933         char *filter = NULL;
 934         const char * const *attrs = trust_attrs;
 935
 936         struct ldb_result *res = NULL;
 937         filter = talloc_asprintf(mem_ctx, "(&(objectClass=trustedDomain)(|(flatname=%s)(trustPartner=%s)))", realm, realm);
 938
 939         if (!filter) {
 940                 ret = ENOMEM;
 941                 krb5_set_error_message(context, ret, "talloc_asprintf: out of memory");
 942                 return ret;
 943         }
 944
 945         lret = ldb_search(ldb_ctx, mem_ctx, &res,
 946                           ldb_get_default_basedn(ldb_ctx),
 947                           LDB_SCOPE_SUBTREE, attrs, "%s", filter);
 948         if (lret != LDB_SUCCESS) {
 949                 DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx)));
 950                 return HDB_ERR_NOENTRY;
 951         } else if (res->count == 0 || res->count > 1) {
 952                 DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count));
 953                 talloc_free(res);
 954                 return HDB_ERR_NOENTRY;
 955         }
 956         talloc_steal(mem_ctx, res->msgs);
 957         *pmsg = res->msgs[0];
 958         talloc_free(res);
 959         return 0;
 960 }
 961
 962 static krb5_error_code samba_kdc_lookup_client(krb5_context context,
 963                                                 struct samba_kdc_db_context *kdc_db_ctx,
 964                                                 TALLOC_CTX *mem_ctx,
 965                                                 krb5_const_principal principal,
 966                                                 const char **attrs,
 967                                                 struct ldb_dn **realm_dn,
 968                                                 struct ldb_message **msg) {
 969         NTSTATUS nt_status;
 970         char *principal_string;
 971         krb5_error_code ret;
 972
 973         ret = krb5_unparse_name(context, principal, &principal_string);
 974
 975         if (ret != 0) {
 976                 return ret;
 977         }
 978
 979         nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
 980                                               mem_ctx, principal_string, attrs,
 981                                               realm_dn, msg);
 982         free(principal_string);
 983         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
 984                 return HDB_ERR_NOENTRY;
 985         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
 986                 return ENOMEM;
 987         } else if (!NT_STATUS_IS_OK(nt_status)) {
 988                 return EINVAL;
 989         }
 990
 991         return ret;
 992 }
 993
 994 static krb5_error_code samba_kdc_fetch_client(krb5_context context,
 995                                                struct samba_kdc_db_context *kdc_db_ctx,
 996                                                TALLOC_CTX *mem_ctx,
 997                                                krb5_const_principal principal,
 998                                                hdb_entry_ex *entry_ex) {
 999         struct ldb_dn *realm_dn;
1000         krb5_error_code ret;
1001         struct ldb_message *msg = NULL;
1002
1003         ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1004                                        mem_ctx, principal, user_attrs,
1005                                        &realm_dn, &msg);
1006         if (ret != 0) {
1007                 return ret;
1008         }
1009
1010         ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1011                                        principal, SAMBA_KDC_ENT_TYPE_CLIENT,
1012                                        realm_dn, msg, entry_ex);
1013         return ret;
1014 }
1015
1016 static krb5_error_code samba_kdc_fetch_krbtgt(krb5_context context,
1017                                         struct samba_kdc_db_context *kdc_db_ctx,
1018                                         TALLOC_CTX *mem_ctx,
1019                                         krb5_const_principal principal,
1020                                         hdb_entry_ex *entry_ex)
1021 {
1022         struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1023         krb5_error_code ret;
1024         struct ldb_message *msg = NULL;
1025         struct ldb_dn *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1026         const char *realm;
1027
1028         krb5_principal alloc_principal = NULL;
1029         if (principal->name.name_string.len != 2
1030             || (strcmp(principal->name.name_string.val[0], KRB5_TGS_NAME) != 0)) {
1031                 /* Not a krbtgt */
1032                 return HDB_ERR_NOENTRY;
1033         }
1034
1035         /* krbtgt case.  Either us or a trusted realm */
1036
1037         if (lp_is_my_domain_or_realm(lp_ctx, principal->realm)
1038             && lp_is_my_domain_or_realm(lp_ctx, principal->name.name_string.val[1])) {
1039                 /* us */
1040                 /* Cludge, cludge cludge.  If the realm part of krbtgt/realm,
1041                  * is in our db, then direct the caller at our primary
1042                  * krbtgt */
1043
1044                 int lret;
1045                 char *realm_fixed;
1046
1047                 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1048                                        &msg, realm_dn, LDB_SCOPE_SUBTREE,
1049                                        krbtgt_attrs,
1050                                        DSDB_SEARCH_SHOW_EXTENDED_DN,
1051                                        "(&(objectClass=user)(samAccountName=krbtgt))");
1052                 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1053                         krb5_warnx(context, "samba_kdc_fetch: could not find own KRBTGT in DB!");
1054                         krb5_set_error_message(context, HDB_ERR_NOENTRY, "samba_kdc_fetch: could not find own KRBTGT in DB!");
1055                         return HDB_ERR_NOENTRY;
1056                 } else if (lret != LDB_SUCCESS) {
1057                         krb5_warnx(context, "samba_kdc_fetch: could not find own KRBTGT in DB: %s", ldb_errstring(kdc_db_ctx->samdb));
1058                         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));
1059                         return HDB_ERR_NOENTRY;
1060                 }
1061
1062                 realm_fixed = strupper_talloc(mem_ctx, lp_realm(lp_ctx));
1063                 if (!realm_fixed) {
1064                         ret = ENOMEM;
1065                         krb5_set_error_message(context, ret, "strupper_talloc: out of memory");
1066                         return ret;
1067                 }
1068
1069                 ret = krb5_copy_principal(context, principal, &alloc_principal);
1070                 if (ret) {
1071                         return ret;
1072                 }
1073
1074                 free(alloc_principal->name.name_string.val[1]);
1075                 alloc_principal->name.name_string.val[1] = strdup(realm_fixed);
1076                 talloc_free(realm_fixed);
1077                 if (!alloc_principal->name.name_string.val[1]) {
1078                         ret = ENOMEM;
1079                         krb5_set_error_message(context, ret, "samba_kdc_fetch: strdup() failed!");
1080                         return ret;
1081                 }
1082                 principal = alloc_principal;
1083
1084                 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1085                                         principal, SAMBA_KDC_ENT_TYPE_KRBTGT,
1086                                         realm_dn, msg, entry_ex);
1087                 if (ret != 0) {
1088                         krb5_warnx(context, "samba_kdc_fetch: self krbtgt message2entry failed");
1089                 }
1090                 return ret;
1091
1092         } else {
1093                 enum trust_direction direction = UNKNOWN;
1094
1095                 /* Either an inbound or outbound trust */
1096
1097                 if (strcasecmp(lp_realm(lp_ctx), principal->realm) == 0) {
1098                         /* look for inbound trust */
1099                         direction = INBOUND;
1100                         realm = principal->name.name_string.val[1];
1101                 }
1102
1103                 if (strcasecmp(lp_realm(lp_ctx), principal->name.name_string.val[1]) == 0) {
1104                         /* look for outbound trust */
1105                         direction = OUTBOUND;
1106                         realm = principal->realm;
1107                 }
1108
1109                 /* Trusted domains are under CN=system */
1110
1111                 ret = samba_kdc_lookup_trust(context, kdc_db_ctx->samdb,
1112                                        mem_ctx,
1113                                        realm, realm_dn, &msg);
1114
1115                 if (ret != 0) {
1116                         krb5_warnx(context, "samba_kdc_fetch: could not find principal in DB");
1117                         krb5_set_error_message(context, ret, "samba_kdc_fetch: could not find principal in DB");
1118                         return ret;
1119                 }
1120
1121                 ret = samba_kdc_trust_message2entry(context, kdc_db_ctx, mem_ctx,
1122                                               principal, direction,
1123                                               realm_dn, msg, entry_ex);
1124                 if (ret != 0) {
1125                         krb5_warnx(context, "samba_kdc_fetch: trust_message2entry failed");
1126                 }
1127                 return ret;
1128
1129
1130                 /* we should lookup trusted domains */
1131                 return HDB_ERR_NOENTRY;
1132         }
1133
1134 }
1135
1136 static krb5_error_code samba_kdc_lookup_server(krb5_context context,
1137                                                 struct samba_kdc_db_context *kdc_db_ctx,
1138                                                 TALLOC_CTX *mem_ctx,
1139                                                 krb5_const_principal principal,
1140                                                 const char **attrs,
1141                                                 struct ldb_dn **realm_dn,
1142                                                 struct ldb_message **msg)
1143 {
1144         krb5_error_code ret;
1145         const char *realm;
1146         if (principal->name.name_string.len >= 2) {
1147                 /* 'normal server' case */
1148                 int ldb_ret;
1149                 NTSTATUS nt_status;
1150                 struct ldb_dn *user_dn;
1151                 char *principal_string;
1152
1153                 ret = krb5_unparse_name_flags(context, principal,
1154                                               KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1155                                               &principal_string);
1156                 if (ret != 0) {
1157                         return ret;
1158                 }
1159
1160                 /* At this point we may find the host is known to be
1161                  * in a different realm, so we should generate a
1162                  * referral instead */
1163                 nt_status = crack_service_principal_name(kdc_db_ctx->samdb,
1164                                                          mem_ctx, principal_string,
1165                                                          &user_dn, realm_dn);
1166                 free(principal_string);
1167
1168                 if (!NT_STATUS_IS_OK(nt_status)) {
1169                         return HDB_ERR_NOENTRY;
1170                 }
1171
1172                 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb,
1173                                           mem_ctx,
1174                                           msg, user_dn, LDB_SCOPE_BASE,
1175                                           attrs, DSDB_SEARCH_SHOW_EXTENDED_DN, "(objectClass=*)");
1176                 if (ldb_ret != LDB_SUCCESS) {
1177                         return HDB_ERR_NOENTRY;
1178                 }
1179
1180         } else {
1181                 int lret;
1182                 char *filter = NULL;
1183                 char *short_princ;
1184                 /* server as client principal case, but we must not lookup userPrincipalNames */
1185                 *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1186                 realm = krb5_principal_get_realm(context, principal);
1187
1188                 /* TODO: Check if it is our realm, otherwise give referall */
1189
1190                 ret = krb5_unparse_name_flags(context, principal,  KRB5_PRINCIPAL_UNPARSE_NO_REALM, &short_princ);
1191
1192                 if (ret != 0) {
1193                         krb5_set_error_message(context, ret, "samba_kdc_lookup_principal: could not parse principal");
1194                         krb5_warnx(context, "samba_kdc_lookup_principal: could not parse principal");
1195                         return ret;
1196                 }
1197
1198                 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx, msg,
1199                                        *realm_dn, LDB_SCOPE_SUBTREE,
1200                                        attrs,
1201                                        DSDB_SEARCH_SHOW_EXTENDED_DN,
1202                                        "(&(objectClass=user)(samAccountName=%s))",
1203                                        ldb_binary_encode_string(mem_ctx, short_princ));
1204                 free(short_princ);
1205                 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1206                         DEBUG(3, ("Failed find a entry for %s\n", filter));
1207                         return HDB_ERR_NOENTRY;
1208                 }
1209                 if (lret != LDB_SUCCESS) {
1210                         DEBUG(3, ("Failed single search for for %s - %s\n",
1211                                   filter, ldb_errstring(kdc_db_ctx->samdb)));
1212                         return HDB_ERR_NOENTRY;
1213                 }
1214         }
1215
1216         return 0;
1217 }
1218
1219 static krb5_error_code samba_kdc_fetch_server(krb5_context context,
1220                                                struct samba_kdc_db_context *kdc_db_ctx,
1221                                                TALLOC_CTX *mem_ctx,
1222                                                krb5_const_principal principal,
1223                                                hdb_entry_ex *entry_ex)
1224 {
1225         krb5_error_code ret;
1226         struct ldb_dn *realm_dn;
1227         struct ldb_message *msg;
1228
1229         ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, principal,
1230                                        server_attrs, &realm_dn, &msg);
1231         if (ret != 0) {
1232                 return ret;
1233         }
1234
1235         ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1236                                 principal, SAMBA_KDC_ENT_TYPE_SERVER,
1237                                 realm_dn, msg, entry_ex);
1238         if (ret != 0) {
1239                 krb5_warnx(context, "samba_kdc_fetch: message2entry failed");
1240         }
1241
1242         return ret;
1243 }
1244
1245 krb5_error_code samba_kdc_fetch(krb5_context context,
1246                                 struct samba_kdc_db_context *kdc_db_ctx,
1247                                 krb5_const_principal principal,
1248                                 unsigned flags,
1249                                 hdb_entry_ex *entry_ex)
1250 {
1251         krb5_error_code ret = HDB_ERR_NOENTRY;
1252         TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_fetch context");
1253
1254         if (!mem_ctx) {
1255                 ret = ENOMEM;
1256                 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1257                 return ret;
1258         }
1259
1260         if (flags & HDB_F_GET_CLIENT) {
1261                 ret = samba_kdc_fetch_client(context, kdc_db_ctx, mem_ctx, principal, entry_ex);
1262                 if (ret != HDB_ERR_NOENTRY) goto done;
1263         }
1264         if (flags & HDB_F_GET_SERVER) {
1265                 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
1266                 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, entry_ex);
1267                 if (ret != HDB_ERR_NOENTRY) goto done;
1268
1269                 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
1270                 ret = samba_kdc_fetch_server(context, kdc_db_ctx, mem_ctx, principal, entry_ex);
1271                 if (ret != HDB_ERR_NOENTRY) goto done;
1272         }
1273         if (flags & HDB_F_GET_KRBTGT) {
1274                 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, entry_ex);
1275                 if (ret != HDB_ERR_NOENTRY) goto done;
1276         }
1277
1278 done:
1279         talloc_free(mem_ctx);
1280         return ret;
1281 }
1282
1283 struct samba_kdc_seq {
1284         unsigned int index;
1285         unsigned int count;
1286         struct ldb_message **msgs;
1287         struct ldb_dn *realm_dn;
1288 };
1289
1290 static krb5_error_code samba_kdc_seq(krb5_context context,
1291                                      struct samba_kdc_db_context *kdc_db_ctx,
1292                                      hdb_entry_ex *entry)
1293 {
1294         krb5_error_code ret;
1295         struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
1296         TALLOC_CTX *mem_ctx;
1297         hdb_entry_ex entry_ex;
1298         memset(&entry_ex, '\0', sizeof(entry_ex));
1299
1300         if (!priv) {
1301                 return HDB_ERR_NOENTRY;
1302         }
1303
1304         mem_ctx = talloc_named(priv, 0, "samba_kdc_seq context");
1305
1306         if (!mem_ctx) {
1307                 ret = ENOMEM;
1308                 krb5_set_error_message(context, ret, "samba_kdc_seq: talloc_named() failed!");
1309                 return ret;
1310         }
1311
1312         if (priv->index < priv->count) {
1313                 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1314                                         NULL, SAMBA_KDC_ENT_TYPE_ANY,
1315                                         priv->realm_dn, priv->msgs[priv->index++], entry);
1316         } else {
1317                 ret = HDB_ERR_NOENTRY;
1318         }
1319
1320         if (ret != 0) {
1321                 TALLOC_FREE(priv);
1322                 kdc_db_ctx->seq_ctx = NULL;
1323         } else {
1324                 talloc_free(mem_ctx);
1325         }
1326
1327         return ret;
1328 }
1329
1330 krb5_error_code samba_kdc_firstkey(krb5_context context,
1331                                    struct samba_kdc_db_context *kdc_db_ctx,
1332                                    hdb_entry_ex *entry)
1333 {
1334         struct ldb_context *ldb_ctx = kdc_db_ctx->samdb;
1335         struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
1336         char *realm;
1337         struct ldb_result *res = NULL;
1338         krb5_error_code ret;
1339         TALLOC_CTX *mem_ctx;
1340         int lret;
1341
1342         if (priv) {
1343                 TALLOC_FREE(priv);
1344                 kdc_db_ctx->seq_ctx = NULL;
1345         }
1346
1347         priv = (struct samba_kdc_seq *) talloc(kdc_db_ctx, struct samba_kdc_seq);
1348         if (!priv) {
1349                 ret = ENOMEM;
1350                 krb5_set_error_message(context, ret, "talloc: out of memory");
1351                 return ret;
1352         }
1353
1354         priv->index = 0;
1355         priv->msgs = NULL;
1356         priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
1357         priv->count = 0;
1358
1359         mem_ctx = talloc_named(priv, 0, "samba_kdc_firstkey context");
1360
1361         if (!mem_ctx) {
1362                 ret = ENOMEM;
1363                 krb5_set_error_message(context, ret, "samba_kdc_firstkey: talloc_named() failed!");
1364                 return ret;
1365         }
1366
1367         ret = krb5_get_default_realm(context, &realm);
1368         if (ret != 0) {
1369                 TALLOC_FREE(priv);
1370                 return ret;
1371         }
1372
1373         lret = ldb_search(ldb_ctx, priv, &res,
1374                           priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
1375                           "(objectClass=user)");
1376
1377         if (lret != LDB_SUCCESS) {
1378                 TALLOC_FREE(priv);
1379                 return HDB_ERR_NOENTRY;
1380         }
1381
1382         priv->count = res->count;
1383         priv->msgs = talloc_steal(priv, res->msgs);
1384         talloc_free(res);
1385
1386         kdc_db_ctx->seq_ctx = priv;
1387
1388         ret = samba_kdc_seq(context, kdc_db_ctx, entry);
1389
1390         if (ret != 0) {
1391                 TALLOC_FREE(priv);
1392                 kdc_db_ctx->seq_ctx = NULL;
1393         } else {
1394                 talloc_free(mem_ctx);
1395         }
1396         return ret;
1397 }
1398
1399 krb5_error_code samba_kdc_nextkey(krb5_context context,
1400                                   struct samba_kdc_db_context *kdc_db_ctx,
1401                                   hdb_entry_ex *entry)
1402 {
1403         return samba_kdc_seq(context, kdc_db_ctx, entry);
1404 }
1405
1406 /* Check if a given entry may delegate or do s4u2self to this target principal
1407  *
1408  * This is currently a very nasty hack - allowing only delegation to itself.
1409  *
1410  * This is shared between the constrained delegation and S4U2Self code.
1411  */
1412 krb5_error_code
1413 samba_kdc_check_identical_client_and_server(krb5_context context,
1414                                             struct samba_kdc_db_context *kdc_db_ctx,
1415                                             hdb_entry_ex *entry,
1416                                             krb5_const_principal target_principal)
1417 {
1418         krb5_error_code ret;
1419         krb5_principal enterprise_prinicpal = NULL;
1420         struct ldb_dn *realm_dn;
1421         struct ldb_message *msg;
1422         struct dom_sid *orig_sid;
1423         struct dom_sid *target_sid;
1424         struct samba_kdc_entry *p = talloc_get_type(entry->ctx, struct samba_kdc_entry);
1425         const char *delegation_check_attrs[] = {
1426                 "objectSid", NULL
1427         };
1428
1429         TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_constrained_delegation");
1430
1431         if (!mem_ctx) {
1432                 ret = ENOMEM;
1433                 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1434                 return ret;
1435         }
1436
1437         if (target_principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1438                 /* Need to reparse the enterprise principal to find the real target */
1439                 if (target_principal->name.name_string.len != 1) {
1440                         ret = KRB5_PARSE_MALFORMED;
1441                         krb5_set_error_message(context, ret, "samba_kdc_check_constrained_delegation: request for delegation to enterprise principal with wrong (%d) number of components",
1442                                                target_principal->name.name_string.len);
1443                         talloc_free(mem_ctx);
1444                         return ret;
1445                 }
1446                 ret = krb5_parse_name(context, target_principal->name.name_string.val[0],
1447                                       &enterprise_prinicpal);
1448                 if (ret) {
1449                         talloc_free(mem_ctx);
1450                         return ret;
1451                 }
1452                 target_principal = enterprise_prinicpal;
1453         }
1454
1455         ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, target_principal,
1456                                        delegation_check_attrs, &realm_dn, &msg);
1457
1458         krb5_free_principal(context, enterprise_prinicpal);
1459
1460         if (ret != 0) {
1461                 talloc_free(mem_ctx);
1462                 return ret;
1463         }
1464
1465         orig_sid = samdb_result_dom_sid(mem_ctx, p->msg, "objectSid");
1466         target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
1467
1468         /* Allow delegation to the same principal, even if by a different
1469          * name.  The easy and safe way to prove this is by SID
1470          * comparison */
1471         if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
1472                 talloc_free(mem_ctx);
1473                 return KRB5KDC_ERR_BADOPTION;
1474         }
1475
1476         talloc_free(mem_ctx);
1477         return ret;
1478 }
1479
1480 /* Certificates printed by a the Certificate Authority might have a
1481  * slightly different form of the user principal name to that in the
1482  * database.  Allow a mismatch where they both refer to the same
1483  * SID */
1484
1485 krb5_error_code
1486 samba_kdc_check_pkinit_ms_upn_match(krb5_context context,
1487                                     struct samba_kdc_db_context *kdc_db_ctx,
1488                                      hdb_entry_ex *entry,
1489                                      krb5_const_principal certificate_principal)
1490 {
1491         krb5_error_code ret;
1492         struct ldb_dn *realm_dn;
1493         struct ldb_message *msg;
1494         struct dom_sid *orig_sid;
1495         struct dom_sid *target_sid;
1496         struct samba_kdc_entry *p = talloc_get_type(entry->ctx, struct samba_kdc_entry);
1497         const char *ms_upn_check_attrs[] = {
1498                 "objectSid", NULL
1499         };
1500
1501         TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_pkinit_ms_upn_match");
1502
1503         if (!mem_ctx) {
1504                 ret = ENOMEM;
1505                 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1506                 return ret;
1507         }
1508
1509         ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1510                                        mem_ctx, certificate_principal,
1511                                        ms_upn_check_attrs, &realm_dn, &msg);
1512
1513         if (ret != 0) {
1514                 talloc_free(mem_ctx);
1515                 return ret;
1516         }
1517
1518         orig_sid = samdb_result_dom_sid(mem_ctx, p->msg, "objectSid");
1519         target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
1520
1521         /* Consider these to be the same principal, even if by a different
1522          * name.  The easy and safe way to prove this is by SID
1523          * comparison */
1524         if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
1525                 talloc_free(mem_ctx);
1526                 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1527         }
1528
1529         talloc_free(mem_ctx);
1530         return ret;
1531 }
1532