source/kdc/hdb-ldb.c

   1 /*
   2  * Copyright (c) 1999-2001, 2003, PADL Software Pty Ltd.
   3  * Copyright (c) 2004, Andrew Bartlett <abartlet@samba.org>.
   4  * Copyright (c) 2004, Stefan Metzmacher <metze@samba.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * 3. Neither the name of PADL Software  nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "includes.h"
  36 #include "kdc.h"
  37 #include "ads.h"
  38 #include "hdb.h"
  39 #include "lib/ldb/include/ldb.h"
  40 #include "lib/ldb/include/ldb_errors.h"
  41 #include "system/iconv.h"
  42 #include "librpc/gen_ndr/netlogon.h"
  43 #include "auth/auth.h"
  44 #include "dsdb/samdb/samdb.h"
  45
  46 enum hdb_ldb_ent_type
  47 { HDB_LDB_ENT_TYPE_CLIENT, HDB_LDB_ENT_TYPE_SERVER,
  48   HDB_LDB_ENT_TYPE_KRBTGT, HDB_LDB_ENT_TYPE_ANY };
  49
  50 static const char * const krb5_attrs[] = {
  51         "objectClass",
  52         "sAMAccountName",
  53
  54         "userPrincipalName",
  55         "servicePrincipalName",
  56
  57         "krb5Key",
  58
  59         "userAccountControl",
  60
  61         "pwdLastSet",
  62         "accountExpires",
  63
  64         "whenCreated",
  65         "whenChanged",
  66
  67         "msDS-KeyVersionNumber",
  68         NULL
  69 };
  70
  71 static const char *realm_ref_attrs[] = {
  72         "nCName",
  73         "dnsRoot",
  74         NULL
  75 };
  76
  77 static KerberosTime ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, KerberosTime default_val)
  78 {
  79     const char *tmp;
  80     const char *gentime;
  81     struct tm tm;
  82
  83     gentime = ldb_msg_find_string(msg, attr, NULL);
  84     if (!gentime)
  85         return default_val;
  86
  87     tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
  88     if (tmp == NULL) {
  89             return default_val;
  90     }
  91
  92     return timegm(&tm);
  93 }
  94
  95 static HDBFlags uf2HDBFlags(krb5_context context, int userAccountControl, enum hdb_ldb_ent_type ent_type)
  96 {
  97         HDBFlags flags = int2HDBFlags(0);
  98
  99         krb5_warnx(context, "uf2HDBFlags: userAccountControl: %08x\n", userAccountControl);
 100
 101         /* we don't allow kadmin deletes */
 102         flags.immutable = 1;
 103
 104         /* mark the principal as invalid to start with */
 105         flags.invalid = 1;
 106
 107         flags.renewable = 1;
 108
 109         /* All accounts are servers, but this may be disabled again in the caller */
 110         flags.server = 1;
 111
 112         /* Account types - clear the invalid bit if it turns out to be valid */
 113         if (userAccountControl & UF_NORMAL_ACCOUNT) {
 114                 if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
 115                         flags.client = 1;
 116                 }
 117                 flags.invalid = 0;
 118         }
 119
 120         if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
 121                 if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
 122                         flags.client = 1;
 123                 }
 124                 flags.invalid = 0;
 125         }
 126         if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
 127                 if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
 128                         flags.client = 1;
 129                 }
 130                 flags.invalid = 0;
 131         }
 132         if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
 133                 if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
 134                         flags.client = 1;
 135                 }
 136                 flags.invalid = 0;
 137         }
 138
 139         /* Not permitted to act as a client if disabled */
 140         if (userAccountControl & UF_ACCOUNTDISABLE) {
 141                 flags.client = 0;
 142         }
 143         if (userAccountControl & UF_LOCKOUT) {
 144                 flags.invalid = 1;
 145         }
 146 /*
 147         if (userAccountControl & UF_PASSWORD_NOTREQD) {
 148                 flags.invalid = 1;
 149         }
 150 */
 151 /*
 152         if (userAccountControl & UF_PASSWORD_CANT_CHANGE) {
 153                 flags.invalid = 1;
 154         }
 155 */
 156 /*
 157         if (userAccountControl & UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED) {
 158                 flags.invalid = 1;
 159         }
 160 */
 161         if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
 162                 flags.invalid = 1;
 163         }
 164
 165 /* UF_DONT_EXPIRE_PASSWD handled in LDB_message2entry() */
 166
 167 /*
 168         if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
 169                 flags.invalid = 1;
 170         }
 171 */
 172         if (userAccountControl & UF_SMARTCARD_REQUIRED) {
 173                 flags.require_hwauth = 1;
 174         }
 175         if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
 176                 flags.ok_as_delegate = 1;
 177         }
 178         if (!(userAccountControl & UF_NOT_DELEGATED)) {
 179                 flags.forwardable = 1;
 180                 flags.proxiable = 1;
 181         }
 182
 183 /*
 184         if (userAccountControl & UF_SMARTCARD_USE_DES_KEY_ONLY) {
 185                 flags.invalid = 1;
 186         }
 187 */
 188         if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
 189                 flags.require_preauth = 0;
 190         } else {
 191                 flags.require_preauth = 1;
 192
 193         }
 194
 195         krb5_warnx(context, "uf2HDBFlags: HDBFlags: %08x\n", HDBFlags2int(flags));
 196
 197         return flags;
 198 }
 199
 200 static int hdb_ldb_destrutor(void *ptr)
 201 {
 202     struct hdb_ldb_private *private = ptr;
 203     hdb_entry_ex *entry_ex = private->entry_ex;
 204     free_hdb_entry(&entry_ex->entry);
 205     return 0;
 206 }
 207
 208 static void hdb_ldb_free_entry(krb5_context context, hdb_entry_ex *entry_ex)
 209 {
 210         talloc_free(entry_ex->ctx);
 211 }
 212
 213 /*
 214  * Construct an hdb_entry from a directory entry.
 215  */
 216 static krb5_error_code LDB_message2entry(krb5_context context, HDB *db,
 217                                          TALLOC_CTX *mem_ctx, krb5_const_principal principal,
 218                                          enum hdb_ldb_ent_type ent_type,
 219                                          struct ldb_message *msg,
 220                                          struct ldb_message *realm_ref_msg,
 221                                          hdb_entry_ex *entry_ex)
 222 {
 223         unsigned int userAccountControl;
 224         int i;
 225         krb5_error_code ret = 0;
 226         krb5_boolean is_computer = FALSE;
 227         const char *dnsdomain = ldb_msg_find_string(realm_ref_msg, "dnsRoot", NULL);
 228         char *realm = strupper_talloc(mem_ctx, dnsdomain);
 229         struct ldb_dn *domain_dn = samdb_result_dn(mem_ctx, realm_ref_msg, "nCName", ldb_dn_new(mem_ctx));
 230
 231         struct hdb_ldb_private *private;
 232         NTTIME acct_expiry;
 233         struct ldb_message_element *ldb_keys;
 234
 235         struct ldb_message_element *objectclasses;
 236         struct ldb_val computer_val;
 237         computer_val.data = discard_const_p(uint8_t,"computer");
 238         computer_val.length = strlen((const char *)computer_val.data);
 239
 240         objectclasses = ldb_msg_find_element(msg, "objectClass");
 241
 242         if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
 243                 is_computer = TRUE;
 244         }
 245
 246         memset(entry_ex, 0, sizeof(*entry_ex));
 247
 248         krb5_warnx(context, "LDB_message2entry:\n");
 249
 250         if (!realm) {
 251                 krb5_set_error_string(context, "talloc_strdup: out of memory");
 252                 ret = ENOMEM;
 253                 goto out;
 254         }
 255
 256         private = talloc(mem_ctx, struct hdb_ldb_private);
 257         if (!private) {
 258                 ret = ENOMEM;
 259                 goto out;
 260         }
 261
 262         private->entry_ex = entry_ex;
 263
 264         talloc_set_destructor(private, hdb_ldb_destrutor);
 265
 266         entry_ex->ctx = private;
 267         entry_ex->free_entry = hdb_ldb_free_entry;
 268
 269         userAccountControl = ldb_msg_find_uint(msg, "userAccountControl", 0);
 270
 271
 272         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
 273         if (ent_type == HDB_LDB_ENT_TYPE_ANY && principal == NULL) {
 274                 const char *samAccountName = ldb_msg_find_string(msg, "samAccountName", NULL);
 275                 if (!samAccountName) {
 276                         krb5_set_error_string(context, "LDB_message2entry: no samAccountName present");
 277                         ret = ENOENT;
 278                         goto out;
 279                 }
 280                 samAccountName = ldb_msg_find_string(msg, "samAccountName", NULL);
 281                 krb5_make_principal(context, &entry_ex->entry.principal, realm, samAccountName, NULL);
 282         } else {
 283                 char *strdup_realm;
 284                 ret = copy_Principal(principal, entry_ex->entry.principal);
 285                 if (ret) {
 286                         krb5_clear_error_string(context);
 287                         goto out;
 288                 }
 289
 290                 /* While we have copied the client principal, tests
 291                  * show that Win2k3 returns the 'corrected' realm, not
 292                  * the client-specified realm.  This code attempts to
 293                  * replace the client principal's realm with the one
 294                  * we determine from our records */
 295
 296                 /* don't leak */
 297                 free(*krb5_princ_realm(context, entry_ex->entry.principal));
 298
 299                 /* this has to be with malloc() */
 300                 strdup_realm = strdup(realm);
 301                 if (!strdup_realm) {
 302                         ret = ENOMEM;
 303                         krb5_clear_error_string(context);
 304                         goto out;
 305                 }
 306                 krb5_princ_set_realm(context, entry_ex->entry.principal, &strdup_realm);
 307         }
 308
 309         entry_ex->entry.kvno = ldb_msg_find_int(msg, "msDS-KeyVersionNumber", 0);
 310
 311         entry_ex->entry.flags = uf2HDBFlags(context, userAccountControl, ent_type);
 312
 313         if (ent_type == HDB_LDB_ENT_TYPE_KRBTGT) {
 314                 entry_ex->entry.flags.invalid = 0;
 315                 entry_ex->entry.flags.server = 1;
 316                 entry_ex->entry.flags.forwardable = 1;
 317                 entry_ex->entry.flags.ok_as_delegate = 1;
 318         }
 319
 320         if (lp_parm_bool(-1, "kdc", "require spn for service", True)) {
 321                 if (!is_computer && !ldb_msg_find_string(msg, "servicePrincipalName", NULL)) {
 322                         entry_ex->entry.flags.server = 0;
 323                 }
 324         }
 325
 326         /* use 'whenCreated' */
 327         entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
 328         /* use '???' */
 329         entry_ex->entry.created_by.principal = NULL;
 330
 331         entry_ex->entry.modified_by = (Event *) malloc(sizeof(Event));
 332         if (entry_ex->entry.modified_by == NULL) {
 333                 krb5_set_error_string(context, "malloc: out of memory");
 334                 ret = ENOMEM;
 335                 goto out;
 336         }
 337
 338         /* use 'whenChanged' */
 339         entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
 340         /* use '???' */
 341         entry_ex->entry.modified_by->principal = NULL;
 342
 343         entry_ex->entry.valid_start = NULL;
 344
 345         acct_expiry = samdb_result_nttime(msg, "accountExpires", (NTTIME)-1);
 346         if ((acct_expiry == (NTTIME)-1) ||
 347             (acct_expiry == 0x7FFFFFFFFFFFFFFFULL)) {
 348                 entry_ex->entry.valid_end = NULL;
 349         } else {
 350                 entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
 351                 if (entry_ex->entry.valid_end == NULL) {
 352                         ret = ENOMEM;
 353                         goto out;
 354                 }
 355                 *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
 356         }
 357
 358         if (!(userAccountControl & UF_DONT_EXPIRE_PASSWD) &&
 359             (ent_type != HDB_LDB_ENT_TYPE_KRBTGT)) {
 360                 NTTIME must_change_time
 361                         = samdb_result_force_password_change((struct ldb_context *)db->hdb_db, mem_ctx,
 362                                                              domain_dn, msg,
 363                                                              "pwdLastSet");
 364                 if (must_change_time != 0) {
 365                         entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
 366                         if (entry_ex->entry.pw_end == NULL) {
 367                                 ret = ENOMEM;
 368                                 goto out;
 369                         }
 370                         *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
 371                 } else {
 372                         entry_ex->entry.pw_end = NULL;
 373                 }
 374         } else {
 375                 entry_ex->entry.pw_end = NULL;
 376         }
 377
 378         entry_ex->entry.max_life = NULL;
 379
 380         entry_ex->entry.max_renew = NULL;
 381
 382         entry_ex->entry.generation = NULL;
 383
 384         /* Get krb5Key from the db */
 385
 386         ldb_keys = ldb_msg_find_element(msg, "krb5Key");
 387
 388         if (!ldb_keys) {
 389                 /* oh, no password.  Apparently (comment in
 390                  * hdb-ldap.c) this violates the ASN.1, but this
 391                  * allows an entry with no keys (yet). */
 392                 entry_ex->entry.keys.val = NULL;
 393                 entry_ex->entry.keys.len = 0;
 394         } else {
 395                 /* allocate space to decode into */
 396                 entry_ex->entry.keys.val = calloc(ldb_keys->num_values, sizeof(Key));
 397                 if (entry_ex->entry.keys.val == NULL) {
 398                         ret = ENOMEM;
 399                         goto out;
 400                 }
 401                 entry_ex->entry.keys.len = ldb_keys->num_values;
 402
 403                 /* Decode Kerberos keys into the hdb structure */
 404                 for (i=0; i < entry_ex->entry.keys.len; i++) {
 405                         size_t decode_len;
 406                         ret = decode_Key(ldb_keys->values[i].data, ldb_keys->values[i].length,
 407                                          &entry_ex->entry.keys.val[i], &decode_len);
 408                         if (ret) {
 409                                 /* Could be bougus data in the entry, or out of memory */
 410                                 goto out;
 411                         }
 412                 }
 413         }
 414
 415         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
 416         if (entry_ex->entry.etypes == NULL) {
 417                 krb5_clear_error_string(context);
 418                 ret = ENOMEM;
 419                 goto out;
 420         }
 421         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
 422         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
 423         if (entry_ex->entry.etypes->val == NULL) {
 424                 krb5_clear_error_string(context);
 425                 ret = ENOMEM;
 426                 goto out;
 427         }
 428         for (i=0; i < entry_ex->entry.etypes->len; i++) {
 429                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
 430         }
 431
 432
 433         private->msg = talloc_steal(private, msg);
 434         private->realm_ref_msg = talloc_steal(private, realm_ref_msg);
 435         private->samdb = (struct ldb_context *)db->hdb_db;
 436
 437         entry_ex->check_client_access = hdb_ldb_check_client_access;
 438         entry_ex->authz_data_tgs_req = hdb_ldb_authz_data_tgs_req;
 439         entry_ex->authz_data_as_req = hdb_ldb_authz_data_as_req;
 440
 441 out:
 442         if (ret != 0) {
 443                 /* This doesn't free ent itself, that is for the eventual caller to do */
 444                 hdb_free_entry(context, entry_ex);
 445         } else {
 446                 talloc_steal(db, entry_ex->ctx);
 447         }
 448
 449         return ret;
 450 }
 451
 452 static krb5_error_code LDB_lookup_principal(krb5_context context, struct ldb_context *ldb_ctx,
 453                                             TALLOC_CTX *mem_ctx,
 454                                             krb5_const_principal principal,
 455                                             enum hdb_ldb_ent_type ent_type,
 456                                             const struct ldb_dn *realm_dn,
 457                                             struct ldb_message ***pmsg)
 458 {
 459         krb5_error_code ret;
 460         int lret;
 461         char *filter = NULL;
 462         const char * const *princ_attrs = krb5_attrs;
 463
 464         char *short_princ;
 465         char *short_princ_talloc;
 466
 467         char *realm_dn_str;
 468
 469         struct ldb_result *res = NULL;
 470
 471         ret = krb5_unparse_name_norealm(context, principal, &short_princ);
 472
 473         if (ret != 0) {
 474                 krb5_set_error_string(context, "LDB_lookup_principal: could not parse principal");
 475                 krb5_warnx(context, "LDB_lookup_principal: could not parse principal");
 476                 return ret;
 477         }
 478
 479         short_princ_talloc = talloc_strdup(mem_ctx, short_princ);
 480         free(short_princ);
 481         if (!short_princ || !short_princ_talloc) {
 482                 krb5_set_error_string(context, "LDB_lookup_principal: talloc_strdup() failed!");
 483                 return ENOMEM;
 484         }
 485
 486         switch (ent_type) {
 487         case HDB_LDB_ENT_TYPE_CLIENT:
 488                 /* Can't happen */
 489                 return EINVAL;
 490         case HDB_LDB_ENT_TYPE_ANY:
 491                 /* Can't happen */
 492                 return EINVAL;
 493         case HDB_LDB_ENT_TYPE_KRBTGT:
 494                 filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(samAccountName=%s))",
 495                                          KRB5_TGS_NAME);
 496                 break;
 497         case HDB_LDB_ENT_TYPE_SERVER:
 498                 filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(samAccountName=%s))",
 499                                          short_princ_talloc);
 500                 break;
 501         }
 502
 503         if (!filter) {
 504                 krb5_set_error_string(context, "talloc_asprintf: out of memory");
 505                 return ENOMEM;
 506         }
 507
 508         lret = ldb_search(ldb_ctx, realm_dn, LDB_SCOPE_SUBTREE, filter, princ_attrs, &res);
 509
 510         realm_dn_str = ldb_dn_linearize(mem_ctx, realm_dn);
 511
 512         if (lret != LDB_SUCCESS || res->count == 0) {
 513                 krb5_warnx(context, "ldb_search: basedn: '%s' filter: '%s' failed: %s",
 514                            realm_dn_str, filter, ldb_errstring(ldb_ctx));
 515                 krb5_set_error_string(context, "ldb_search: basedn: '%s' filter: '%s' failed: %s",
 516                                       realm_dn_str, filter, ldb_errstring(ldb_ctx));
 517                 return HDB_ERR_NOENTRY;
 518         } else if (res->count > 1) {
 519                 krb5_warnx(context, "ldb_search: basedn: '%s' filter: '%s' more than 1 entry: %d",
 520                            realm_dn_str, filter, res->count);
 521                 krb5_set_error_string(context, "ldb_search: basedn: '%s' filter: '%s' more than 1 entry: %d",
 522                                       realm_dn_str, filter, res->count);
 523                 talloc_free(res);
 524                 return HDB_ERR_NOENTRY;
 525         }
 526         talloc_steal(mem_ctx, res->msgs);
 527         *pmsg = res->msgs;
 528         talloc_free(res);
 529         return 0;
 530 }
 531
 532 static krb5_error_code LDB_lookup_realm(krb5_context context, struct ldb_context *ldb_ctx,
 533                                         TALLOC_CTX *mem_ctx,
 534                                         const char *realm,
 535                                         struct ldb_message ***pmsg)
 536 {
 537         int ret;
 538         char *cross_ref_filter;
 539         struct ldb_result *cross_ref_res;
 540
 541         cross_ref_filter = talloc_asprintf(mem_ctx,
 542                                            "(&(&(|(&(dnsRoot=%s)(nETBIOSName=*))(nETBIOSName=%s))(objectclass=crossRef))(ncName=*))",
 543                                            realm, realm);
 544         if (!cross_ref_filter) {
 545                 krb5_set_error_string(context, "asprintf: out of memory");
 546                 return ENOMEM;
 547         }
 548
 549         ret = ldb_search(ldb_ctx, NULL, LDB_SCOPE_SUBTREE, cross_ref_filter, realm_ref_attrs, &cross_ref_res);
 550
 551         if (ret != LDB_SUCCESS || cross_ref_res->count == 0) {
 552                 krb5_warnx(context, "ldb_search: filter: '%s' failed: %s", cross_ref_filter, ldb_errstring(ldb_ctx));
 553                 krb5_set_error_string(context, "ldb_search: filter: '%s' failed: %s", cross_ref_filter, ldb_errstring(ldb_ctx));
 554
 555                 talloc_free(cross_ref_res);
 556                 return HDB_ERR_NOENTRY;
 557         } else if (cross_ref_res->count > 1) {
 558                 krb5_warnx(context, "ldb_search: filter: '%s' more than 1 entry: %d", cross_ref_filter, cross_ref_res->count);
 559                 krb5_set_error_string(context, "ldb_search: filter: '%s' more than 1 entry: %d", cross_ref_filter, cross_ref_res->count);
 560
 561                 talloc_free(cross_ref_res);
 562                 return HDB_ERR_NOENTRY;
 563         }
 564
 565         if (pmsg) {
 566                 *pmsg = talloc_steal(mem_ctx, cross_ref_res->msgs);
 567         } else {
 568                 talloc_free(cross_ref_res);
 569         }
 570
 571         return 0;
 572 }
 573
 574
 575 static krb5_error_code LDB_open(krb5_context context, HDB *db, int flags, mode_t mode)
 576 {
 577         if (db->hdb_master_key_set) {
 578                 krb5_warnx(context, "LDB_open: use of a master key incompatible with LDB\n");
 579                 krb5_set_error_string(context, "LDB_open: use of a master key incompatible with LDB\n");
 580                 return HDB_ERR_NOENTRY;
 581         }
 582
 583         return 0;
 584 }
 585
 586 static krb5_error_code LDB_close(krb5_context context, HDB *db)
 587 {
 588         return 0;
 589 }
 590
 591 static krb5_error_code LDB_lock(krb5_context context, HDB *db, int operation)
 592 {
 593         return 0;
 594 }
 595
 596 static krb5_error_code LDB_unlock(krb5_context context, HDB *db)
 597 {
 598         return 0;
 599 }
 600
 601 static krb5_error_code LDB_rename(krb5_context context, HDB *db, const char *new_name)
 602 {
 603         return HDB_ERR_DB_INUSE;
 604 }
 605
 606 static krb5_error_code LDB_fetch(krb5_context context, HDB *db, unsigned flags,
 607                                  krb5_const_principal principal,
 608                                  enum hdb_ent_type ent_type,
 609                                  hdb_entry_ex *entry_ex)
 610 {
 611         struct ldb_message **msg = NULL;
 612         struct ldb_message **realm_ref_msg = NULL;
 613         struct ldb_message **realm_fixed_msg = NULL;
 614         enum hdb_ldb_ent_type ldb_ent_type;
 615         krb5_error_code ret;
 616
 617         const char *realm;
 618         const struct ldb_dn *realm_dn;
 619         TALLOC_CTX *mem_ctx = talloc_named(db, 0, "LDB_fetch context");
 620
 621         if (!mem_ctx) {
 622                 krb5_set_error_string(context, "LDB_fetch: talloc_named() failed!");
 623                 return ENOMEM;
 624         }
 625
 626         switch (ent_type) {
 627         case HDB_ENT_TYPE_CLIENT:
 628         {
 629                 NTSTATUS nt_status;
 630                 char *principal_string;
 631                 ldb_ent_type = HDB_LDB_ENT_TYPE_CLIENT;
 632
 633                 ret = krb5_unparse_name(context, principal, &principal_string);
 634
 635                 if (ret != 0) {
 636                         talloc_free(mem_ctx);
 637                         return ret;
 638                 }
 639
 640                 nt_status = sam_get_results_principal((struct ldb_context *)db->hdb_db,
 641                                                       mem_ctx, principal_string,
 642                                                       &msg, &realm_ref_msg);
 643                 free(principal_string);
 644                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
 645                         talloc_free(mem_ctx);
 646                         return HDB_ERR_NOENTRY;
 647                 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
 648                         talloc_free(mem_ctx);
 649                         return ENOMEM;
 650                 } else if (!NT_STATUS_IS_OK(nt_status)) {
 651                         talloc_free(mem_ctx);
 652                         return EINVAL;
 653                 }
 654
 655                 ret = LDB_message2entry(context, db, mem_ctx,
 656                                         principal, ldb_ent_type,
 657                                         msg[0], realm_ref_msg[0], entry_ex);
 658
 659                 talloc_free(mem_ctx);
 660                 return ret;
 661         }
 662         case HDB_ENT_TYPE_SERVER:
 663                 if (principal->name.name_string.len == 2
 664                     && (strcmp(principal->name.name_string.val[0], KRB5_TGS_NAME) == 0)) {
 665                         /* krbtgt case.  Either us or a trusted realm */
 666                         if ((LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db,
 667                                               mem_ctx, principal->name.name_string.val[1], &realm_fixed_msg) == 0)) {
 668                                 /* us */
 669                                 /* Cludge, cludge cludge.  If the realm part of krbtgt/realm,
 670                                  * is in our db, then direct the caller at our primary
 671                                  * krgtgt */
 672
 673                                 const char *dnsdomain = ldb_msg_find_string(realm_fixed_msg[0], "dnsRoot", NULL);
 674                                 char *realm_fixed = strupper_talloc(mem_ctx, dnsdomain);
 675                                 if (!realm_fixed) {
 676                                         krb5_set_error_string(context, "strupper_talloc: out of memory");
 677                                         talloc_free(mem_ctx);
 678                                         return ENOMEM;
 679                                 }
 680
 681                                 free(principal->name.name_string.val[1]);
 682                                 principal->name.name_string.val[1] = strdup(realm_fixed);
 683                                 talloc_free(realm_fixed);
 684                                 if (!principal->name.name_string.val[1]) {
 685                                         krb5_set_error_string(context, "LDB_fetch: strdup() failed!");
 686                                         talloc_free(mem_ctx);
 687                                         return ENOMEM;
 688                                 }
 689                                 ldb_ent_type = HDB_LDB_ENT_TYPE_KRBTGT;
 690                                 break;
 691                         } else {
 692                                 /* we should lookup trusted domains */
 693                                 talloc_free(mem_ctx);
 694                                 return HDB_ERR_NOENTRY;
 695                         }
 696
 697                 } else if (principal->name.name_string.len >= 2) {
 698                         /* 'normal server' case */
 699                         int ldb_ret;
 700                         NTSTATUS nt_status;
 701                         struct ldb_dn *user_dn, *domain_dn;
 702                         char *principal_string;
 703                         ldb_ent_type = HDB_LDB_ENT_TYPE_SERVER;
 704
 705                         ret = krb5_unparse_name_norealm(context, principal, &principal_string);
 706
 707                         if (ret != 0) {
 708                                 talloc_free(mem_ctx);
 709                                 return ret;
 710                         }
 711
 712                         /* At this point we may find the host is known to be
 713                          * in a different realm, so we should generate a
 714                          * referral instead */
 715                         nt_status = crack_service_principal_name((struct ldb_context *)db->hdb_db,
 716                                                                  mem_ctx, principal_string,
 717                                                                  &user_dn, &domain_dn);
 718                         free(principal_string);
 719
 720                         if (!NT_STATUS_IS_OK(nt_status)) {
 721                                 talloc_free(mem_ctx);
 722                                 return HDB_ERR_NOENTRY;
 723                         }
 724
 725                         ldb_ret = gendb_search_dn((struct ldb_context *)db->hdb_db,
 726                                                   mem_ctx, user_dn, &msg, krb5_attrs);
 727
 728                         if (ldb_ret != 1) {
 729                                 talloc_free(mem_ctx);
 730                                 return HDB_ERR_NOENTRY;
 731                         }
 732
 733                         ldb_ret = gendb_search((struct ldb_context *)db->hdb_db,
 734                                                mem_ctx, NULL, &realm_ref_msg, realm_ref_attrs,
 735                                                "ncName=%s", ldb_dn_linearize(mem_ctx, domain_dn));
 736
 737                         if (ldb_ret != 1) {
 738                                 talloc_free(mem_ctx);
 739                                 return HDB_ERR_NOENTRY;
 740                         }
 741
 742                         ret = LDB_message2entry(context, db, mem_ctx,
 743                                                 principal, ldb_ent_type,
 744                                                 msg[0], realm_ref_msg[0], entry_ex);
 745                         talloc_free(mem_ctx);
 746                         return ret;
 747
 748                 } else {
 749                         ldb_ent_type = HDB_LDB_ENT_TYPE_SERVER;
 750                         /* server as client principal case, but we must not lookup userPrincipalNames */
 751                         break;
 752                 }
 753         case HDB_ENT_TYPE_ANY:
 754                 krb5_warnx(context, "LDB_fetch: ENT_TYPE_ANY is not valid in hdb-ldb!");
 755                 talloc_free(mem_ctx);
 756                 return HDB_ERR_NOENTRY;
 757         default:
 758                 krb5_warnx(context, "LDB_fetch: invalid ent_type specified!");
 759                 talloc_free(mem_ctx);
 760                 return HDB_ERR_NOENTRY;
 761         }
 762
 763
 764         realm = krb5_principal_get_realm(context, principal);
 765
 766         ret = LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db,
 767                                mem_ctx, realm, &realm_ref_msg);
 768         if (ret != 0) {
 769                 krb5_warnx(context, "LDB_fetch: could not find realm");
 770                 talloc_free(mem_ctx);
 771                 return HDB_ERR_NOENTRY;
 772         }
 773
 774         realm_dn = samdb_result_dn(mem_ctx, realm_ref_msg[0], "nCName", NULL);
 775
 776         ret = LDB_lookup_principal(context, (struct ldb_context *)db->hdb_db,
 777                                    mem_ctx,
 778                                    principal, ldb_ent_type, realm_dn, &msg);
 779
 780         if (ret != 0) {
 781                 krb5_warnx(context, "LDB_fetch: could not find principal in DB");
 782                 krb5_set_error_string(context, "LDB_fetch: could not find principal in DB");
 783                 talloc_free(mem_ctx);
 784                 return ret;
 785         } else {
 786                 ret = LDB_message2entry(context, db, mem_ctx,
 787                                         principal, ldb_ent_type,
 788                                         msg[0], realm_ref_msg[0], entry_ex);
 789                 if (ret != 0) {
 790                         krb5_warnx(context, "LDB_fetch: message2entry failed\n");
 791                 }
 792         }
 793
 794         talloc_free(mem_ctx);
 795         return ret;
 796 }
 797
 798 static krb5_error_code LDB_store(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 799 {
 800         return HDB_ERR_DB_INUSE;
 801 }
 802
 803 static krb5_error_code LDB_remove(krb5_context context, HDB *db, hdb_entry_ex *entry)
 804 {
 805         return HDB_ERR_DB_INUSE;
 806 }
 807
 808 struct hdb_ldb_seq {
 809         struct ldb_context *ctx;
 810         int index;
 811         int count;
 812         struct ldb_message **msgs;
 813         struct ldb_message **realm_ref_msgs;
 814 };
 815
 816 static krb5_error_code LDB_seq(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 817 {
 818         krb5_error_code ret;
 819         struct hdb_ldb_seq *priv = (struct hdb_ldb_seq *)db->hdb_openp;
 820         TALLOC_CTX *mem_ctx;
 821         hdb_entry_ex entry_ex;
 822         memset(&entry_ex, '\0', sizeof(entry_ex));
 823
 824         if (!priv) {
 825                 return HDB_ERR_NOENTRY;
 826         }
 827
 828         mem_ctx = talloc_named(priv, 0, "LDB_seq context");
 829
 830         if (!mem_ctx) {
 831                 krb5_set_error_string(context, "LDB_seq: talloc_named() failed!");
 832                 return ENOMEM;
 833         }
 834
 835         if (priv->index < priv->count) {
 836                 ret = LDB_message2entry(context, db, mem_ctx,
 837                                         NULL, HDB_LDB_ENT_TYPE_ANY,
 838                                         priv->msgs[priv->index++],
 839                                         priv->realm_ref_msgs[0], entry);
 840         } else {
 841                 ret = HDB_ERR_NOENTRY;
 842         }
 843
 844         if (ret != 0) {
 845                 talloc_free(priv);
 846                 db->hdb_openp = NULL;
 847         } else {
 848                 talloc_free(mem_ctx);
 849         }
 850
 851         return ret;
 852 }
 853
 854 static krb5_error_code LDB_firstkey(krb5_context context, HDB *db, unsigned flags,
 855                                         hdb_entry_ex *entry)
 856 {
 857         struct ldb_context *ldb_ctx = (struct ldb_context *)db->hdb_db;
 858         struct hdb_ldb_seq *priv = (struct hdb_ldb_seq *)db->hdb_openp;
 859         char *realm;
 860         struct ldb_dn *realm_dn = NULL;
 861         struct ldb_result *res = NULL;
 862         struct ldb_message **realm_ref_msgs = NULL;
 863         krb5_error_code ret;
 864         TALLOC_CTX *mem_ctx;
 865         int lret;
 866
 867         if (priv) {
 868                 talloc_free(priv);
 869                 db->hdb_openp = 0;
 870         }
 871
 872         priv = (struct hdb_ldb_seq *) talloc(db, struct hdb_ldb_seq);
 873         if (!priv) {
 874                 krb5_set_error_string(context, "talloc: out of memory");
 875                 return ENOMEM;
 876         }
 877
 878         priv->ctx = ldb_ctx;
 879         priv->index = 0;
 880         priv->msgs = NULL;
 881         priv->realm_ref_msgs = NULL;
 882         priv->count = 0;
 883
 884         mem_ctx = talloc_named(priv, 0, "LDB_firstkey context");
 885
 886         if (!mem_ctx) {
 887                 krb5_set_error_string(context, "LDB_firstkey: talloc_named() failed!");
 888                 return ENOMEM;
 889         }
 890
 891         ret = krb5_get_default_realm(context, &realm);
 892         if (ret != 0) {
 893                 talloc_free(priv);
 894                 return ret;
 895         }
 896
 897         ret = LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db,
 898                                mem_ctx, realm, &realm_ref_msgs);
 899
 900         free(realm);
 901
 902         if (ret != 0) {
 903                 talloc_free(priv);
 904                 krb5_warnx(context, "LDB_firstkey: could not find realm\n");
 905                 return HDB_ERR_NOENTRY;
 906         }
 907
 908         realm_dn = samdb_result_dn(mem_ctx, realm_ref_msgs[0], "nCName", NULL);
 909
 910         priv->realm_ref_msgs = talloc_steal(priv, realm_ref_msgs);
 911
 912         krb5_warnx(context, "LDB_firstkey: realm ok\n");
 913
 914         lret = ldb_search(ldb_ctx, realm_dn,
 915                                  LDB_SCOPE_SUBTREE, "(objectClass=user)",
 916                                  krb5_attrs, &res);
 917
 918         if (lret != LDB_SUCCESS) {
 919                 talloc_free(priv);
 920                 return HDB_ERR_NOENTRY;
 921         }
 922
 923         priv->count = res->count;
 924         priv->msgs = talloc_steal(priv, res->msgs);
 925
 926         db->hdb_openp = priv;
 927
 928         ret = LDB_seq(context, db, flags, entry);
 929
 930         if (ret != 0) {
 931                 talloc_free(priv);
 932                 db->hdb_openp = NULL;
 933         } else {
 934                 talloc_free(mem_ctx);
 935         }
 936         return ret;
 937 }
 938
 939 static krb5_error_code LDB_nextkey(krb5_context context, HDB *db, unsigned flags,
 940                                    hdb_entry_ex *entry)
 941 {
 942         return LDB_seq(context, db, flags, entry);
 943 }
 944
 945 static krb5_error_code LDB_destroy(krb5_context context, HDB *db)
 946 {
 947         talloc_free(db);
 948         return 0;
 949 }
 950
 951 NTSTATUS hdb_ldb_create(TALLOC_CTX *mem_ctx,
 952                         krb5_context context, struct HDB **db, const char *arg)
 953 {
 954         NTSTATUS nt_status;
 955         struct auth_session_info *session_info;
 956         *db = talloc(mem_ctx, HDB);
 957         if (!*db) {
 958                 krb5_set_error_string(context, "malloc: out of memory");
 959                 return NT_STATUS_NO_MEMORY;
 960         }
 961
 962         (*db)->hdb_master_key_set = 0;
 963         (*db)->hdb_db = NULL;
 964
 965         nt_status = auth_system_session_info(*db, &session_info);
 966         if (!NT_STATUS_IS_OK(nt_status)) {
 967                 return nt_status;
 968         }
 969
 970         /* The idea here is very simple.  Using Kerberos to
 971          * authenticate the KDC to the LDAP server is higly likely to
 972          * be circular.
 973          *
 974          * In future we may set this up to use EXERNAL and SSL
 975          * certificates, for now it will almost certainly be NTLMSSP
 976         */
 977
 978         nt_status = cli_credentials_gensec_remove_oid(session_info->credentials,
 979                                                       GENSEC_OID_KERBEROS5);
 980         if (!NT_STATUS_IS_OK(nt_status)) {
 981                 return nt_status;
 982         }
 983
 984         /* Setup the link to LDB */
 985         (*db)->hdb_db = samdb_connect(*db, session_info);
 986         if ((*db)->hdb_db == NULL) {
 987                 DEBUG(1, ("hdb_ldb_create: Cannot open samdb for KDC backend!"));
 988                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 989         }
 990
 991         (*db)->hdb_openp = 0;
 992         (*db)->hdb_open = LDB_open;
 993         (*db)->hdb_close = LDB_close;
 994         (*db)->hdb_fetch = LDB_fetch;
 995         (*db)->hdb_store = LDB_store;
 996         (*db)->hdb_remove = LDB_remove;
 997         (*db)->hdb_firstkey = LDB_firstkey;
 998         (*db)->hdb_nextkey = LDB_nextkey;
 999         (*db)->hdb_lock = LDB_lock;
1000         (*db)->hdb_unlock = LDB_unlock;
1001         (*db)->hdb_rename = LDB_rename;
1002         /* we don't implement these, as we are not a lockable database */
1003         (*db)->hdb__get = NULL;
1004         (*db)->hdb__put = NULL;
1005         /* kadmin should not be used for deletes - use other tools instead */
1006         (*db)->hdb__del = NULL;
1007         (*db)->hdb_destroy = LDB_destroy;
1008
1009         return NT_STATUS_OK;
1010 }