source3/winbindd/idmap_rfc2307.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  *
   4  * Id mapping using LDAP records as defined in RFC 2307
   5  *
   6  * The SID<->uid/gid mapping is performed in two steps: 1) Query the
   7  * AD server for the name<->sid mapping. 2) Query an LDAP server
   8  * according to RFC 2307 for the name<->uid/gid mapping.
   9  *
  10  * Copyright (C) Christof Schmitt 2012,2013
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 3 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  24  */
  25
  26 #include "includes.h"
  27 #include "winbindd.h"
  28 #include "ads.h"
  29 #include "idmap.h"
  30 #include "smbldap.h"
  31 #include "nsswitch/winbind_client.h"
  32 #include "lib/winbind_util.h"
  33
  34 /*
  35  * Config and connection info per domain.
  36  */
  37 struct idmap_rfc2307_context {
  38         const char *bind_path_user;
  39         const char *bind_path_group;
  40         const char *ldap_domain;
  41         bool cn_realm;
  42         bool user_cn;
  43         const char *realm;
  44
  45         /*
  46          * Pointer to ldap struct in ads or smbldap_state, has to be
  47          * updated after connecting to server
  48          */
  49         LDAP *ldap;
  50
  51         /* Optional function to check connection to server */
  52         NTSTATUS (*check_connection)(struct idmap_domain *dom);
  53
  54         /* Issue ldap query */
  55         NTSTATUS (*search)(struct idmap_rfc2307_context *ctx,
  56                            const char *bind_path, const char *expr,
  57                            const char **attrs, LDAPMessage **res);
  58
  59         /* Access to LDAP in AD server */
  60         ADS_STRUCT *ads;
  61
  62         /* Access to stand-alone LDAP server */
  63         struct smbldap_state *smbldap_state;
  64 };
  65
  66 /*
  67  * backend functions for LDAP queries through ADS
  68  */
  69
  70 static NTSTATUS idmap_rfc2307_ads_check_connection(struct idmap_domain *dom)
  71 {
  72         struct idmap_rfc2307_context *ctx;
  73         const char *dom_name = dom->name;
  74         ADS_STATUS status;
  75
  76         DEBUG(10, ("ad_idmap_cached_connection: called for domain '%s'\n",
  77                    dom->name));
  78
  79         ctx = talloc_get_type(dom->private_data, struct idmap_rfc2307_context);
  80         dom_name = ctx->ldap_domain ? ctx->ldap_domain : dom->name;
  81
  82         status = ads_idmap_cached_connection(&ctx->ads, dom_name);
  83         if (ADS_ERR_OK(status)) {
  84                 ctx->ldap = ctx->ads->ldap.ld;
  85                 if (ctx->cn_realm) {
  86                         ctx->realm = ctx->ads->server.realm;
  87                 }
  88         } else {
  89                 DEBUG(1, ("Could not connect to domain %s: %s\n", dom->name,
  90                           ads_errstr(status)));
  91         }
  92
  93         return ads_ntstatus(status);
  94 }
  95
  96 static NTSTATUS idmap_rfc2307_ads_search(struct idmap_rfc2307_context *ctx,
  97                                          const char *bind_path,
  98                                          const char *expr,
  99                                          const char **attrs,
 100                                          LDAPMessage **result)
 101 {
 102         ADS_STATUS status;
 103
 104         status = ads_do_search_retry(ctx->ads, bind_path,
 105                                      LDAP_SCOPE_SUBTREE, expr, attrs, result);
 106         ctx->ldap = ctx->ads->ldap.ld;
 107         return ads_ntstatus(status);
 108 }
 109
 110 static NTSTATUS idmap_rfc2307_init_ads(struct idmap_rfc2307_context *ctx,
 111                                        const char *cfg_opt)
 112 {
 113         const char *ldap_domain;
 114
 115         ctx->search = idmap_rfc2307_ads_search;
 116         ctx->check_connection = idmap_rfc2307_ads_check_connection;
 117
 118         ldap_domain = lp_parm_const_string(-1, cfg_opt, "ldap_domain",
 119                                               NULL);
 120         if (ldap_domain) {
 121                 ctx->ldap_domain = talloc_strdup(ctx, ldap_domain);
 122                 if (ctx->ldap_domain == NULL) {
 123                         return NT_STATUS_NO_MEMORY;
 124                 }
 125         }
 126
 127         return NT_STATUS_OK;
 128 }
 129
 130 /*
 131  * backend function for LDAP queries through stand-alone LDAP server
 132  */
 133
 134 static NTSTATUS idmap_rfc2307_ldap_search(struct idmap_rfc2307_context *ctx,
 135                                           const char *bind_path,
 136                                           const char *expr,
 137                                           const char **attrs,
 138                                           LDAPMessage **result)
 139 {
 140         int ret;
 141
 142         ret = smbldap_search(ctx->smbldap_state, bind_path, LDAP_SCOPE_SUBTREE,
 143                              expr, attrs, 0, result);
 144         ctx->ldap = ctx->smbldap_state->ldap_struct;
 145
 146         if (ret == LDAP_SUCCESS) {
 147                 return NT_STATUS_OK;
 148         }
 149
 150         return NT_STATUS_LDAP(ret);
 151 }
 152
 153 static bool idmap_rfc2307_get_uint32(LDAP *ldap, LDAPMessage *entry,
 154                                      const char *field, uint32_t *value)
 155 {
 156         bool b;
 157         char str[20];
 158
 159         b = smbldap_get_single_attribute(ldap, entry, field, str, sizeof(str));
 160
 161         if (b) {
 162                 *value = atoi(str);
 163         }
 164
 165         return b;
 166 }
 167
 168 static NTSTATUS idmap_rfc2307_init_ldap(struct idmap_rfc2307_context *ctx,
 169                                         struct idmap_domain *dom,
 170                                         const char *config_option)
 171 {
 172         NTSTATUS ret;
 173         char *url;
 174         char *secret = NULL;
 175         const char *ldap_url, *user_dn, *ldap_realm;
 176         TALLOC_CTX *mem_ctx = ctx;
 177
 178         ldap_url = lp_parm_const_string(-1, config_option, "ldap_url", NULL);
 179         if (!ldap_url) {
 180                 DEBUG(1, ("ERROR: missing idmap ldap url\n"));
 181                 return NT_STATUS_UNSUCCESSFUL;
 182         }
 183
 184         url = talloc_strdup(talloc_tos(), ldap_url);
 185
 186         user_dn = lp_parm_const_string(-1, config_option, "ldap_user_dn", NULL);
 187         if (user_dn) {
 188                 secret = idmap_fetch_secret("ldap", dom->name, user_dn);
 189                 if (!secret) {
 190                         ret = NT_STATUS_ACCESS_DENIED;
 191                         goto done;
 192                 }
 193         }
 194
 195         /* assume anonymous if we don't have a specified user */
 196         ret = smbldap_init(mem_ctx, winbind_event_context(), url,
 197                            (user_dn == NULL), user_dn, secret,
 198                            &ctx->smbldap_state);
 199         SAFE_FREE(secret);
 200         if (!NT_STATUS_IS_OK(ret)) {
 201                 DEBUG(1, ("ERROR: smbldap_init (%s) failed!\n", url));
 202                 goto done;
 203         }
 204
 205         ctx->search = idmap_rfc2307_ldap_search;
 206
 207         if (ctx->cn_realm) {
 208                 ldap_realm = lp_parm_const_string(-1, config_option,
 209                                                   "ldap_realm", NULL);
 210                 if (!ldap_realm) {
 211                         DEBUG(1, ("ERROR: cn_realm set, "
 212                                   "but ldap_realm is missing\n"));
 213                         ret = NT_STATUS_UNSUCCESSFUL;
 214                         goto done;
 215                 }
 216                 ctx->realm = talloc_strdup(mem_ctx, ldap_realm);
 217                 if (!ctx->realm) {
 218                         ret = NT_STATUS_NO_MEMORY;
 219                 }
 220         }
 221
 222 done:
 223         talloc_free(url);
 224         return ret;
 225 }
 226
 227 /*
 228  * common code for stand-alone LDAP and ADS
 229  */
 230
 231 static void idmap_rfc2307_map_sid_results(struct idmap_rfc2307_context *ctx,
 232                                           TALLOC_CTX *mem_ctx,
 233                                           struct id_map **ids,
 234                                           LDAPMessage *result,
 235                                           const char *dom_name,
 236                                           const char **attrs, int type)
 237 {
 238         int count, i;
 239         LDAPMessage *entry;
 240
 241         count = ldap_count_entries(ctx->ldap, result);
 242
 243         for (i = 0; i < count; i++) {
 244                 char *name;
 245                 enum lsa_SidType lsa_type;
 246                 struct id_map *map;
 247                 uint32_t id;
 248                 bool b;
 249
 250                 if (i == 0) {
 251                         entry = ldap_first_entry(ctx->ldap, result);
 252                 } else {
 253                         entry = ldap_next_entry(ctx->ldap, result);
 254                 }
 255                 if (!entry) {
 256                         DEBUG(2, ("Unable to fetch entry.\n"));
 257                         break;
 258                 }
 259
 260                 name = smbldap_talloc_single_attribute(ctx->ldap, entry,
 261                                                        attrs[0], mem_ctx);
 262                 if (!name) {
 263                         DEBUG(1, ("Could not get user name\n"));
 264                         continue;
 265                 }
 266
 267                 b = idmap_rfc2307_get_uint32(ctx->ldap, entry, attrs[1], &id);
 268                 if (!b) {
 269                         DEBUG(1, ("Could not pull id for record %s\n", name));
 270                         continue;
 271                 }
 272
 273                 map = idmap_find_map_by_id(ids, type, id);
 274                 if (!map) {
 275                         DEBUG(1, ("Could not find id %d, name %s\n", id, name));
 276                         continue;
 277                 }
 278
 279                 if (ctx->cn_realm) {
 280                         /* Strip @realm from user or group name */
 281                         char *delim;
 282
 283                         delim = strchr(name, '@');
 284                         if (delim) {
 285                                 *delim = '\0';
 286                         }
 287                 }
 288
 289                 /* by default calls to winbindd are disabled
 290                    the following call will not recurse so this is safe */
 291                 (void)winbind_on();
 292                 /* Lookup name from PDC using lsa_lookup_names() */
 293                 b = winbind_lookup_name(dom_name, name, map->sid, &lsa_type);
 294                 (void)winbind_off();
 295
 296                 if (!b) {
 297                         DEBUG(1, ("SID lookup failed for id %d, %s\n",
 298                                   id, name));
 299                         continue;
 300                 }
 301
 302                 if (type == ID_TYPE_UID && lsa_type != SID_NAME_USER) {
 303                         DEBUG(1, ("Wrong type %d for user name %s\n",
 304                                   type, name));
 305                         continue;
 306                 }
 307
 308                 if (type == ID_TYPE_GID && lsa_type != SID_NAME_DOM_GRP &&
 309                     lsa_type != SID_NAME_ALIAS &&
 310                     lsa_type != SID_NAME_WKN_GRP) {
 311                         DEBUG(1, ("Wrong type %d for group name %s\n",
 312                                   type, name));
 313                         continue;
 314                 }
 315
 316                 map->status = ID_MAPPED;
 317         }
 318 }
 319
 320 /*
 321  * Map unixids to names and then to sids.
 322  */
 323 static NTSTATUS idmap_rfc2307_unixids_to_sids(struct idmap_domain *dom,
 324                                               struct id_map **ids)
 325 {
 326         struct idmap_rfc2307_context *ctx;
 327         char *fltr_usr = NULL, *fltr_grp = NULL;
 328         TALLOC_CTX *mem_ctx;
 329         int cnt_usr = 0, cnt_grp = 0, idx = 0, bidx = 0;
 330         LDAPMessage *result = NULL;
 331         NTSTATUS ret;
 332
 333         ctx = talloc_get_type(dom->private_data, struct idmap_rfc2307_context);
 334         mem_ctx = talloc_new(ctx);
 335         if (!mem_ctx) {
 336                 return NT_STATUS_NO_MEMORY;
 337         }
 338
 339         if (ctx->check_connection) {
 340                 ret = ctx->check_connection(dom);
 341                 if (!NT_STATUS_IS_OK(ret)) {
 342                         goto out;
 343                 }
 344         }
 345
 346 again:
 347         bidx = idx;
 348
 349         if (!fltr_usr) {
 350                 /* prepare new user query, see getpwuid() in RFC2307 */
 351                 fltr_usr = talloc_asprintf(mem_ctx,
 352                                              "(&(objectClass=posixAccount)(|");
 353         }
 354
 355         if (!fltr_grp) {
 356                 /* prepare new group query, see getgrgid() in RFC2307 */
 357                 fltr_grp = talloc_asprintf(mem_ctx,
 358                                              "(&(objectClass=posixGroup)(|");
 359         }
 360
 361         if (!fltr_usr || !fltr_grp) {
 362                 ret = NT_STATUS_NO_MEMORY;
 363                 goto out;
 364         }
 365
 366         while (cnt_usr < IDMAP_LDAP_MAX_IDS &&
 367                cnt_grp < IDMAP_LDAP_MAX_IDS && ids[idx]) {
 368
 369                 switch (ids[idx]->xid.type) {
 370                 case ID_TYPE_UID:
 371                         fltr_usr = talloc_asprintf_append_buffer(fltr_usr,
 372                                         "(uidNumber=%d)", ids[idx]->xid.id);
 373                         cnt_usr++;
 374                         break;
 375                 case ID_TYPE_GID:
 376                         fltr_grp = talloc_asprintf_append_buffer(fltr_grp,
 377                                         "(gidNumber=%d))", ids[idx]->xid.id);
 378                         cnt_grp++;
 379                         break;
 380                 default:
 381                         DEBUG(3, ("Error: unknown ID type %d\n",
 382                                   ids[idx]->xid.type));
 383                         ret = NT_STATUS_UNSUCCESSFUL;
 384                         goto out;
 385                 }
 386
 387                 if (!fltr_usr || !fltr_grp) {
 388                         ret = NT_STATUS_NO_MEMORY;
 389                         goto out;
 390                 }
 391
 392                 idx++;
 393         }
 394
 395         if (cnt_usr == IDMAP_LDAP_MAX_IDS || (cnt_usr != 0 && !ids[idx])) {
 396                 const char *attrs[] = { NULL, /* uid or cn */
 397                                         "uidNumber",
 398                                         NULL };
 399
 400                 fltr_usr = talloc_strdup_append(fltr_usr, "))");
 401                 if (!fltr_usr) {
 402                         ret = NT_STATUS_NO_MEMORY;
 403                         goto out;
 404                 }
 405
 406                 attrs[0] = ctx->user_cn ? "cn" : "uid";
 407                 ret = ctx->search(ctx, ctx->bind_path_user, fltr_usr, attrs,
 408                                   &result);
 409                 if (!NT_STATUS_IS_OK(ret)) {
 410                         goto out;
 411                 }
 412
 413                 idmap_rfc2307_map_sid_results(ctx, mem_ctx, &ids[bidx], result,
 414                                               dom->name, attrs, ID_TYPE_UID);
 415                 cnt_usr = 0;
 416                 TALLOC_FREE(fltr_usr);
 417         }
 418
 419         if (cnt_grp == IDMAP_LDAP_MAX_IDS || (cnt_grp != 0 && !ids[idx])) {
 420                 const char *attrs[] = { "cn", "gidNumber", NULL };
 421
 422                 fltr_grp = talloc_strdup_append(fltr_grp, "))");
 423                 if (!fltr_grp) {
 424                         ret = NT_STATUS_NO_MEMORY;
 425                         goto out;
 426                 }
 427                 ret = ctx->search(ctx, ctx->bind_path_group, fltr_grp, attrs,
 428                                   &result);
 429                 if (!NT_STATUS_IS_OK(ret)) {
 430                         goto out;
 431                 }
 432
 433                 idmap_rfc2307_map_sid_results(ctx, mem_ctx, &ids[bidx], result,
 434                                               dom->name, attrs, ID_TYPE_GID);
 435                 cnt_grp = 0;
 436                 TALLOC_FREE(fltr_grp);
 437         }
 438
 439         if (ids[idx]) {
 440                 goto again;
 441         }
 442
 443         ret = NT_STATUS_OK;
 444
 445 out:
 446         talloc_free(mem_ctx);
 447         return ret;
 448 }
 449
 450 struct idmap_rfc2307_map {
 451         struct id_map *map;
 452         const char *name;
 453         enum id_type type;
 454 };
 455
 456 /*
 457  * Lookup names for SIDS and store the data in the local mapping
 458  * array.
 459  */
 460 static NTSTATUS idmap_rfc_2307_sids_to_names(TALLOC_CTX *mem_ctx,
 461                                              struct id_map **ids,
 462                                              struct idmap_rfc2307_map *maps,
 463                                              struct idmap_rfc2307_context *ctx)
 464 {
 465         int i;
 466
 467         for (i = 0; ids[i]; i++) {
 468                 const char *domain, *name;
 469                 enum lsa_SidType lsa_type;
 470                 struct id_map *id = ids[i];
 471                 struct idmap_rfc2307_map *map = &maps[i];
 472                 bool b;
 473
 474                 /* by default calls to winbindd are disabled
 475                    the following call will not recurse so this is safe */
 476                 (void)winbind_on();
 477                 b = winbind_lookup_sid(mem_ctx, ids[i]->sid, &domain, &name,
 478                                        &lsa_type);
 479                 (void)winbind_off();
 480
 481                 if (!b) {
 482                         DEBUG(1, ("Lookup sid %s failed.\n",
 483                                   sid_string_dbg(ids[i]->sid)));
 484                         continue;
 485                 }
 486
 487                 switch(lsa_type) {
 488                 case SID_NAME_USER:
 489                         id->xid.type = map->type = ID_TYPE_UID;
 490                         if (ctx->user_cn && ctx->cn_realm) {
 491                                 name = talloc_asprintf(mem_ctx, "%s@%s",
 492                                                        name, ctx->realm);
 493                         }
 494                         id->xid.type = map->type = ID_TYPE_UID;
 495                         break;
 496
 497                 case SID_NAME_DOM_GRP:
 498                 case SID_NAME_ALIAS:
 499                 case SID_NAME_WKN_GRP:
 500                         if (ctx->cn_realm) {
 501                                 name = talloc_asprintf(mem_ctx, "%s@%s",
 502                                                        name, ctx->realm);
 503                         }
 504                         id->xid.type = map->type = ID_TYPE_GID;
 505                         break;
 506
 507                 default:
 508                         DEBUG(1, ("Unknown lsa type %d for sid %s\n",
 509                                   lsa_type, sid_string_dbg(id->sid)));
 510                         id->status = ID_UNMAPPED;
 511                         continue;
 512                 }
 513
 514                 map->map = id;
 515                 id->status = ID_UNKNOWN;
 516                 map->name = strupper_talloc(mem_ctx, name);
 517
 518                 if (!map->name) {
 519                         return NT_STATUS_NO_MEMORY;
 520                 }
 521         }
 522
 523         return NT_STATUS_OK;
 524 }
 525
 526 /*
 527  * Find id_map entry by looking up the name in the internal
 528  * mapping array.
 529  */
 530 static struct id_map* idmap_rfc2307_find_map(struct idmap_rfc2307_map *maps,
 531                                              enum id_type type,
 532                                              const char *name)
 533 {
 534         int i;
 535
 536         DEBUG(10, ("Looking for name %s, type %d\n", name, type));
 537
 538         for (i = 0; i < IDMAP_LDAP_MAX_IDS; i++) {
 539                 if (maps[i].map == NULL) { /* end of the run */
 540                         return NULL;
 541                 }
 542                 DEBUG(10, ("Entry %d: name %s, type %d\n",
 543                            i, maps[i].name, maps[i].type));
 544                 if (type == maps[i].type && strcmp(name, maps[i].name) == 0) {
 545                         return maps[i].map;
 546                 }
 547         }
 548
 549         return NULL;
 550 }
 551
 552 static void idmap_rfc2307_map_xid_results(struct idmap_rfc2307_context *ctx,
 553                                           TALLOC_CTX *mem_ctx,
 554                                           struct idmap_rfc2307_map *maps,
 555                                           LDAPMessage *result,
 556                                           struct idmap_domain *dom,
 557                                           const char **attrs, enum id_type type)
 558 {
 559         int count, i;
 560         LDAPMessage *entry;
 561
 562         count = ldap_count_entries(ctx->ldap, result);
 563
 564         for (i = 0; i < count; i++) {
 565                 uint32_t id;
 566                 char *name;
 567                 bool b;
 568                 struct id_map *id_map;
 569
 570                 if (i == 0) {
 571                         entry = ldap_first_entry(ctx->ldap, result);
 572                 } else {
 573                         entry = ldap_next_entry(ctx->ldap, result);
 574                 }
 575                 if (!entry) {
 576                         DEBUG(2, ("Unable to fetch entry.\n"));
 577                         break;
 578                 }
 579
 580                 name = smbldap_talloc_single_attribute(ctx->ldap, entry,
 581                                                        attrs[0], mem_ctx);
 582                 if (!name) {
 583                         DEBUG(1, ("Could not get user name\n"));
 584                         continue;
 585                 }
 586
 587                 b = idmap_rfc2307_get_uint32(ctx->ldap, entry, attrs[1], &id);
 588                 if (!b) {
 589                         DEBUG(5, ("Could not pull id for record %s\n", name));
 590                         continue;
 591                 }
 592
 593                 if (!idmap_unix_id_is_in_range(id, dom)) {
 594                         DEBUG(5, ("Requested id (%u) out of range (%u - %u).\n",
 595                                   id, dom->low_id, dom->high_id));
 596                         continue;
 597                 }
 598
 599                 if (!strupper_m(name)) {
 600                         DEBUG(5, ("Could not convert %s to uppercase\n", name));
 601                         continue;
 602                 }
 603                 id_map = idmap_rfc2307_find_map(maps, type, name);
 604                 if (!id_map) {
 605                         DEBUG(0, ("Could not find mapping entry for name %s\n",
 606                                   name));
 607                         continue;
 608                 }
 609
 610                 id_map->xid.id = id;
 611                 id_map->status = ID_MAPPED;
 612         }
 613 }
 614
 615 /*
 616  * Map sids to names and then to unixids.
 617  */
 618 static NTSTATUS idmap_rfc2307_sids_to_unixids(struct idmap_domain *dom,
 619                                               struct id_map **ids)
 620 {
 621         struct idmap_rfc2307_context *ctx;
 622         TALLOC_CTX *mem_ctx;
 623         struct idmap_rfc2307_map *int_maps;
 624         int cnt_usr = 0, cnt_grp = 0, idx = 0;
 625         char *fltr_usr = NULL, *fltr_grp = NULL;
 626         NTSTATUS ret;
 627         int i;
 628
 629         ctx = talloc_get_type(dom->private_data, struct idmap_rfc2307_context);
 630         mem_ctx = talloc_new(talloc_tos());
 631         if (!mem_ctx) {
 632                 return NT_STATUS_NO_MEMORY;
 633         }
 634
 635         if (ctx->check_connection) {
 636                 ret = ctx->check_connection(dom);
 637                 if (!NT_STATUS_IS_OK(ret)) {
 638                         goto out;
 639                 }
 640         }
 641
 642         for (i = 0; ids[i]; i++);
 643         int_maps = talloc_zero_array(mem_ctx, struct idmap_rfc2307_map, i);
 644         if (!int_maps) {
 645                 ret = NT_STATUS_NO_MEMORY;
 646                 goto out;
 647         }
 648
 649         ret = idmap_rfc_2307_sids_to_names(mem_ctx, ids, int_maps, ctx);
 650         if (!NT_STATUS_IS_OK(ret)) {
 651                 goto out;
 652         }
 653
 654 again:
 655         if (!fltr_usr) {
 656                 /* prepare new user query, see getpwuid() in RFC2307 */
 657                 fltr_usr = talloc_asprintf(mem_ctx,
 658                                              "(&(objectClass=posixAccount)(|");
 659         }
 660
 661         if (!fltr_grp) {
 662                 /* prepare new group query, see getgrgid() in RFC2307 */
 663                 fltr_grp = talloc_asprintf(mem_ctx,
 664                                              "(&(objectClass=posixGroup)(|");
 665         }
 666
 667         if (!fltr_usr || !fltr_grp) {
 668                 ret = NT_STATUS_NO_MEMORY;
 669                 goto out;
 670         }
 671
 672         while (cnt_usr < IDMAP_LDAP_MAX_IDS &&
 673                cnt_grp < IDMAP_LDAP_MAX_IDS && ids[idx]) {
 674                 struct id_map *id = ids[idx];
 675                 struct idmap_rfc2307_map *map = &int_maps[idx];
 676
 677                 switch(id->xid.type) {
 678                 case ID_TYPE_UID:
 679                         fltr_usr = talloc_asprintf_append_buffer(fltr_usr,
 680                                      "(%s=%s)", (ctx->user_cn ? "cn" : "uid"),
 681                                       map->name);
 682                         cnt_usr++;
 683                         break;
 684
 685                 case ID_TYPE_GID:
 686                         fltr_grp = talloc_asprintf_append_buffer(fltr_grp,
 687                                          "(cn=%s)", map->name);
 688                         cnt_grp++;
 689                         break;
 690
 691                 default:
 692                         DEBUG(10, ("Nothing to do for SID %s, "
 693                                    "previous name lookup failed\n",
 694                                    sid_string_dbg(map->map->sid)));
 695                 }
 696
 697                 if (!fltr_usr || !fltr_grp) {
 698                         ret = NT_STATUS_NO_MEMORY;
 699                         goto out;
 700                 }
 701
 702                 idx++;
 703         }
 704
 705         if (cnt_usr == IDMAP_LDAP_MAX_IDS || (cnt_usr != 0 && !ids[idx])) {
 706                 const char *attrs[] = { NULL, /* uid or cn */
 707                                         "uidNumber",
 708                                         NULL };
 709                 LDAPMessage *result;
 710
 711                 fltr_usr = talloc_strdup_append(fltr_usr, "))");
 712                 if (!fltr_usr) {
 713                         ret = NT_STATUS_NO_MEMORY;
 714                         goto out;
 715                 }
 716
 717                 attrs[0] = ctx->user_cn ? "cn" : "uid";
 718                 ret = ctx->search(ctx, ctx->bind_path_user, fltr_usr, attrs,
 719                                   &result);
 720                 if (!NT_STATUS_IS_OK(ret)) {
 721                         goto out;
 722                 }
 723
 724                 idmap_rfc2307_map_xid_results(ctx, mem_ctx, int_maps,
 725                                               result, dom, attrs, ID_TYPE_UID);
 726
 727                 cnt_usr = 0;
 728                 TALLOC_FREE(fltr_usr);
 729         }
 730
 731         if (cnt_grp == IDMAP_LDAP_MAX_IDS || (cnt_grp != 0 && !ids[idx])) {
 732                 const char *attrs[] = {"cn", "gidNumber", NULL };
 733                 LDAPMessage *result;
 734
 735                 fltr_grp = talloc_strdup_append(fltr_grp, "))");
 736                 if (!fltr_grp) {
 737                         ret = NT_STATUS_NO_MEMORY;
 738                         goto out;
 739                 }
 740
 741                 ret = ctx->search(ctx, ctx->bind_path_group, fltr_grp, attrs,
 742                                   &result);
 743                 if (!NT_STATUS_IS_OK(ret)) {
 744                         goto out;
 745                 }
 746
 747                 idmap_rfc2307_map_xid_results(ctx, mem_ctx, int_maps, result,
 748                                               dom, attrs, ID_TYPE_GID);
 749                 cnt_grp = 0;
 750                 TALLOC_FREE(fltr_grp);
 751         }
 752
 753         if (ids[idx]) {
 754                 goto again;
 755         }
 756
 757         ret = NT_STATUS_OK;
 758
 759 out:
 760         talloc_free(mem_ctx);
 761         return ret;
 762 }
 763
 764 static int idmap_rfc2307_context_destructor(struct idmap_rfc2307_context *ctx)
 765 {
 766         if (ctx->ads != NULL) {
 767                 /* we own this ADS_STRUCT so make sure it goes away */
 768                 ctx->ads->is_mine = True;
 769                 ads_destroy( &ctx->ads );
 770                 ctx->ads = NULL;
 771         }
 772
 773         if (ctx->smbldap_state != NULL) {
 774                 smbldap_free_struct(&ctx->smbldap_state);
 775         }
 776
 777         return 0;
 778 }
 779
 780 static NTSTATUS idmap_rfc2307_initialize(struct idmap_domain *domain)
 781 {
 782         struct idmap_rfc2307_context *ctx;
 783         char *cfg_opt;
 784         const char *bind_path_user, *bind_path_group, *ldap_server;
 785         NTSTATUS status;
 786
 787         ctx = talloc_zero(domain, struct idmap_rfc2307_context);
 788         if (ctx == NULL) {
 789                 return NT_STATUS_NO_MEMORY;
 790         }
 791         talloc_set_destructor(ctx, idmap_rfc2307_context_destructor);
 792
 793         cfg_opt = talloc_asprintf(ctx, "idmap config %s", domain->name);
 794         if (cfg_opt == NULL) {
 795                 status = NT_STATUS_NO_MEMORY;
 796                 goto err;
 797         }
 798
 799         bind_path_user = lp_parm_const_string(-1, cfg_opt, "bind_path_user",
 800                                               NULL);
 801         if (bind_path_user) {
 802                 ctx->bind_path_user = talloc_strdup(ctx, bind_path_user);
 803                 if (ctx->bind_path_user == NULL) {
 804                         status = NT_STATUS_NO_MEMORY;
 805                         goto err;
 806                 }
 807         } else {
 808                 status = NT_STATUS_INVALID_PARAMETER;
 809                 goto err;
 810         }
 811
 812         bind_path_group = lp_parm_const_string(-1, cfg_opt, "bind_path_group",
 813                                                NULL);
 814         if (bind_path_group) {
 815                 ctx->bind_path_group = talloc_strdup(ctx, bind_path_group);
 816                 if (ctx->bind_path_group == NULL) {
 817                         status = NT_STATUS_NO_MEMORY;
 818                         goto err;
 819                 }
 820         } else {
 821                 status = NT_STATUS_INVALID_PARAMETER;
 822                 goto err;
 823         }
 824
 825         ldap_server = lp_parm_const_string(-1, cfg_opt, "ldap_server", NULL);
 826         if (!ldap_server) {
 827                 status = NT_STATUS_INVALID_PARAMETER;
 828                 goto err;
 829         }
 830
 831         if (strcmp(ldap_server, "stand-alone") == 0) {
 832                 status = idmap_rfc2307_init_ldap(ctx, domain, cfg_opt);
 833
 834         } else if (strcmp(ldap_server, "ad") == 0) {
 835                 status = idmap_rfc2307_init_ads(ctx, cfg_opt);
 836
 837         } else {
 838                 status = NT_STATUS_INVALID_PARAMETER;
 839         }
 840
 841         if (!NT_STATUS_IS_OK(status)) {
 842                 goto err;
 843         }
 844
 845         ctx->cn_realm = lp_parm_bool(-1, cfg_opt, "cn_realm", false);
 846         ctx->user_cn = lp_parm_bool(-1, cfg_opt, "user_cn", false);
 847
 848         domain->private_data = ctx;
 849         talloc_free(cfg_opt);
 850         return NT_STATUS_OK;
 851
 852 err:
 853         talloc_free(cfg_opt);
 854         talloc_free(ctx);
 855         return status;
 856 }
 857
 858 static struct idmap_methods rfc2307_methods = {
 859         .init = idmap_rfc2307_initialize,
 860         .unixids_to_sids = idmap_rfc2307_unixids_to_sids,
 861         .sids_to_unixids = idmap_rfc2307_sids_to_unixids,
 862 };
 863
 864 NTSTATUS idmap_rfc2307_init(void)
 865 {
 866         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "rfc2307",
 867                                   &rfc2307_methods);
 868 }