source3/winbindd/idmap_ldap.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    idmap LDAP backend
   5
   6    Copyright (C) Tim Potter             2000
   7    Copyright (C) Jim McDonough <jmcd@us.ibm.com>        2003
   8    Copyright (C) Gerald Carter          2003
   9    Copyright (C) Simo Sorce             2003-2007
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "winbindd.h"
  27 #include "secrets.h"
  28
  29 #undef DBGC_CLASS
  30 #define DBGC_CLASS DBGC_IDMAP
  31
  32 #include <lber.h>
  33 #include <ldap.h>
  34
  35 #include "smbldap.h"
  36
  37 static char *idmap_fetch_secret(const char *backend, bool alloc,
  38                                 const char *domain, const char *identity)
  39 {
  40         char *tmp, *ret;
  41         int r;
  42
  43         if (alloc) {
  44                 r = asprintf(&tmp, "IDMAP_ALLOC_%s", backend);
  45         } else {
  46                 r = asprintf(&tmp, "IDMAP_%s_%s", backend, domain);
  47         }
  48
  49         if (r < 0)
  50                 return NULL;
  51
  52         strupper_m(tmp); /* make sure the key is case insensitive */
  53         ret = secrets_fetch_generic(tmp, identity);
  54
  55         SAFE_FREE(tmp);
  56
  57         return ret;
  58 }
  59
  60 struct idmap_ldap_context {
  61         struct smbldap_state *smbldap_state;
  62         char *url;
  63         char *suffix;
  64         char *user_dn;
  65         bool anon;
  66 };
  67
  68 struct idmap_ldap_alloc_context {
  69         struct smbldap_state *smbldap_state;
  70         char *url;
  71         char *suffix;
  72         char *user_dn;
  73 };
  74
  75 #define CHECK_ALLOC_DONE(mem) do { \
  76         if (!mem) { \
  77                 DEBUG(0, ("Out of memory!\n")); \
  78                 ret = NT_STATUS_NO_MEMORY; \
  79                 goto done; \
  80         } } while (0)
  81
  82 /**********************************************************************
  83  IDMAP ALLOC TDB BACKEND
  84 **********************************************************************/
  85
  86 static struct idmap_ldap_alloc_context *idmap_alloc_ldap;
  87
  88 /*********************************************************************
  89  ********************************************************************/
  90
  91 static NTSTATUS get_credentials( TALLOC_CTX *mem_ctx,
  92                                  struct smbldap_state *ldap_state,
  93                                  const char *config_option,
  94                                  struct idmap_domain *dom,
  95                                  char **dn )
  96 {
  97         NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
  98         char *secret = NULL;
  99         const char *tmp = NULL;
 100         char *user_dn = NULL;
 101         bool anon = False;
 102
 103         /* assume anonymous if we don't have a specified user */
 104
 105         tmp = lp_parm_const_string(-1, config_option, "ldap_user_dn", NULL);
 106
 107         if ( tmp ) {
 108                 if (!dom) {
 109                         /* only the alloc backend can pass in a NULL dom */
 110                         secret = idmap_fetch_secret("ldap", True,
 111                                                     NULL, tmp);
 112                 } else {
 113                         secret = idmap_fetch_secret("ldap", False,
 114                                                     dom->name, tmp);
 115                 }
 116
 117                 if (!secret) {
 118                         DEBUG(0, ("get_credentials: Unable to fetch "
 119                                   "auth credentials for %s in %s\n",
 120                                   tmp, (dom==NULL)?"ALLOC":dom->name));
 121                         ret = NT_STATUS_ACCESS_DENIED;
 122                         goto done;
 123                 }
 124                 *dn = talloc_strdup(mem_ctx, tmp);
 125                 CHECK_ALLOC_DONE(*dn);
 126         } else {
 127                 if (!fetch_ldap_pw(&user_dn, &secret)) {
 128                         DEBUG(2, ("get_credentials: Failed to lookup ldap "
 129                                   "bind creds. Using anonymous connection.\n"));
 130                         anon = True;
 131                         *dn = NULL;
 132                 } else {
 133                         *dn = talloc_strdup(mem_ctx, user_dn);
 134                         SAFE_FREE( user_dn );
 135                         CHECK_ALLOC_DONE(*dn);
 136                 }
 137         }
 138
 139         smbldap_set_creds(ldap_state, anon, *dn, secret);
 140         ret = NT_STATUS_OK;
 141
 142 done:
 143         SAFE_FREE(secret);
 144
 145         return ret;
 146 }
 147
 148
 149 /**********************************************************************
 150  Verify the sambaUnixIdPool entry in the directory.
 151 **********************************************************************/
 152
 153 static NTSTATUS verify_idpool(struct idmap_domain *dom)
 154 {
 155         NTSTATUS ret;
 156         TALLOC_CTX *ctx;
 157         LDAPMessage *result = NULL;
 158         LDAPMod **mods = NULL;
 159         const char **attr_list;
 160         char *filter;
 161         int count;
 162         int rc;
 163
 164         if ( ! idmap_alloc_ldap) {
 165                 return NT_STATUS_UNSUCCESSFUL;
 166         }
 167
 168         ctx = talloc_new(idmap_alloc_ldap);
 169         if ( ! ctx) {
 170                 DEBUG(0, ("Out of memory!\n"));
 171                 return NT_STATUS_NO_MEMORY;
 172         }
 173
 174         filter = talloc_asprintf(ctx, "(objectclass=%s)", LDAP_OBJ_IDPOOL);
 175         CHECK_ALLOC_DONE(filter);
 176
 177         attr_list = get_attr_list(ctx, idpool_attr_list);
 178         CHECK_ALLOC_DONE(attr_list);
 179
 180         rc = smbldap_search(idmap_alloc_ldap->smbldap_state,
 181                                 idmap_alloc_ldap->suffix,
 182                                 LDAP_SCOPE_SUBTREE,
 183                                 filter,
 184                                 attr_list,
 185                                 0,
 186                                 &result);
 187
 188         if (rc != LDAP_SUCCESS) {
 189                 DEBUG(1, ("Unable to verify the idpool, "
 190                           "cannot continue initialization!\n"));
 191                 return NT_STATUS_UNSUCCESSFUL;
 192         }
 193
 194         count = ldap_count_entries(idmap_alloc_ldap->smbldap_state->ldap_struct,
 195                                    result);
 196
 197         ldap_msgfree(result);
 198
 199         if ( count > 1 ) {
 200                 DEBUG(0,("Multiple entries returned from %s (base == %s)\n",
 201                         filter, idmap_alloc_ldap->suffix));
 202                 ret = NT_STATUS_UNSUCCESSFUL;
 203                 goto done;
 204         }
 205         else if (count == 0) {
 206                 char *uid_str, *gid_str;
 207
 208                 uid_str = talloc_asprintf(ctx, "%lu",
 209                                 (unsigned long)dom->low_id);
 210                 gid_str = talloc_asprintf(ctx, "%lu",
 211                                 (unsigned long)dom->low_id);
 212
 213                 smbldap_set_mod(&mods, LDAP_MOD_ADD,
 214                                 "objectClass", LDAP_OBJ_IDPOOL);
 215                 smbldap_set_mod(&mods, LDAP_MOD_ADD,
 216                                 get_attr_key2string(idpool_attr_list,
 217                                                     LDAP_ATTR_UIDNUMBER),
 218                                 uid_str);
 219                 smbldap_set_mod(&mods, LDAP_MOD_ADD,
 220                                 get_attr_key2string(idpool_attr_list,
 221                                                     LDAP_ATTR_GIDNUMBER),
 222                                 gid_str);
 223                 if (mods) {
 224                         rc = smbldap_modify(idmap_alloc_ldap->smbldap_state,
 225                                                 idmap_alloc_ldap->suffix,
 226                                                 mods);
 227                         ldap_mods_free(mods, True);
 228                 } else {
 229                         ret = NT_STATUS_UNSUCCESSFUL;
 230                         goto done;
 231                 }
 232         }
 233
 234         ret = (rc == LDAP_SUCCESS)?NT_STATUS_OK:NT_STATUS_UNSUCCESSFUL;
 235 done:
 236         talloc_free(ctx);
 237         return ret;
 238 }
 239
 240 /*****************************************************************************
 241  Initialise idmap database.
 242 *****************************************************************************/
 243
 244 static NTSTATUS idmap_ldap_alloc_init(struct idmap_domain *dom,
 245                                       const char *params)
 246 {
 247         NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
 248         const char *tmp;
 249
 250         /* Only do init if we are online */
 251         if (idmap_is_offline()) {
 252                 return NT_STATUS_FILE_IS_OFFLINE;
 253         }
 254
 255         idmap_alloc_ldap = TALLOC_ZERO_P(NULL, struct idmap_ldap_alloc_context);
 256         CHECK_ALLOC_DONE( idmap_alloc_ldap );
 257
 258         if (params && *params) {
 259                 /* assume location is the only parameter */
 260                 idmap_alloc_ldap->url = talloc_strdup(idmap_alloc_ldap, params);
 261         } else {
 262                 tmp = lp_parm_const_string(-1, "idmap alloc config",
 263                                            "ldap_url", NULL);
 264
 265                 if ( ! tmp) {
 266                         DEBUG(1, ("ERROR: missing idmap ldap url\n"));
 267                         ret = NT_STATUS_UNSUCCESSFUL;
 268                         goto done;
 269                 }
 270
 271                 idmap_alloc_ldap->url = talloc_strdup(idmap_alloc_ldap, tmp);
 272         }
 273         CHECK_ALLOC_DONE( idmap_alloc_ldap->url );
 274
 275         trim_char(idmap_alloc_ldap->url, '\"', '\"');
 276
 277         tmp = lp_parm_const_string(-1, "idmap alloc config",
 278                                    "ldap_base_dn", NULL);
 279         if ( ! tmp || ! *tmp) {
 280                 tmp = lp_ldap_idmap_suffix();
 281                 if ( ! tmp) {
 282                         DEBUG(1, ("ERROR: missing idmap ldap suffix\n"));
 283                         ret = NT_STATUS_UNSUCCESSFUL;
 284                         goto done;
 285                 }
 286         }
 287
 288         idmap_alloc_ldap->suffix = talloc_strdup(idmap_alloc_ldap, tmp);
 289         CHECK_ALLOC_DONE( idmap_alloc_ldap->suffix );
 290
 291         ret = smbldap_init(idmap_alloc_ldap, winbind_event_context(),
 292                            idmap_alloc_ldap->url,
 293                            &idmap_alloc_ldap->smbldap_state);
 294         if (!NT_STATUS_IS_OK(ret)) {
 295                 DEBUG(1, ("ERROR: smbldap_init (%s) failed!\n",
 296                           idmap_alloc_ldap->url));
 297                 goto done;
 298         }
 299
 300         ret = get_credentials( idmap_alloc_ldap,
 301                                idmap_alloc_ldap->smbldap_state,
 302                                "idmap alloc config", NULL,
 303                                &idmap_alloc_ldap->user_dn );
 304         if ( !NT_STATUS_IS_OK(ret) ) {
 305                 DEBUG(1,("idmap_ldap_alloc_init: Failed to get connection "
 306                          "credentials (%s)\n", nt_errstr(ret)));
 307                 goto done;
 308         }
 309
 310         /* see if the idmap suffix and sub entries exists */
 311
 312         ret = verify_idpool(dom);
 313
 314  done:
 315         if ( !NT_STATUS_IS_OK( ret ) )
 316                 TALLOC_FREE( idmap_alloc_ldap );
 317
 318         return ret;
 319 }
 320
 321 /********************************
 322  Allocate a new uid or gid
 323 ********************************/
 324
 325 static NTSTATUS idmap_ldap_allocate_id(struct idmap_domain *dom,
 326                                        struct unixid *xid)
 327 {
 328         TALLOC_CTX *ctx;
 329         NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
 330         int rc = LDAP_SERVER_DOWN;
 331         int count = 0;
 332         LDAPMessage *result = NULL;
 333         LDAPMessage *entry = NULL;
 334         LDAPMod **mods = NULL;
 335         char *id_str;
 336         char *new_id_str;
 337         char *filter = NULL;
 338         const char *dn = NULL;
 339         const char **attr_list;
 340         const char *type;
 341
 342         /* Only do query if we are online */
 343         if (idmap_is_offline()) {
 344                 return NT_STATUS_FILE_IS_OFFLINE;
 345         }
 346
 347         if ( ! idmap_alloc_ldap) {
 348                 return NT_STATUS_UNSUCCESSFUL;
 349         }
 350
 351         ctx = talloc_new(idmap_alloc_ldap);
 352         if ( ! ctx) {
 353                 DEBUG(0, ("Out of memory!\n"));
 354                 return NT_STATUS_NO_MEMORY;
 355         }
 356
 357         /* get type */
 358         switch (xid->type) {
 359
 360         case ID_TYPE_UID:
 361                 type = get_attr_key2string(idpool_attr_list,
 362                                            LDAP_ATTR_UIDNUMBER);
 363                 break;
 364
 365         case ID_TYPE_GID:
 366                 type = get_attr_key2string(idpool_attr_list,
 367                                            LDAP_ATTR_GIDNUMBER);
 368                 break;
 369
 370         default:
 371                 DEBUG(2, ("Invalid ID type (0x%x)\n", xid->type));
 372                 return NT_STATUS_INVALID_PARAMETER;
 373         }
 374
 375         filter = talloc_asprintf(ctx, "(objectClass=%s)", LDAP_OBJ_IDPOOL);
 376         CHECK_ALLOC_DONE(filter);
 377
 378         attr_list = get_attr_list(ctx, idpool_attr_list);
 379         CHECK_ALLOC_DONE(attr_list);
 380
 381         DEBUG(10, ("Search of the id pool (filter: %s)\n", filter));
 382
 383         rc = smbldap_search(idmap_alloc_ldap->smbldap_state,
 384                                 idmap_alloc_ldap->suffix,
 385                                LDAP_SCOPE_SUBTREE, filter,
 386                                attr_list, 0, &result);
 387
 388         if (rc != LDAP_SUCCESS) {
 389                 DEBUG(0,("%s object not found\n", LDAP_OBJ_IDPOOL));
 390                 goto done;
 391         }
 392
 393         talloc_autofree_ldapmsg(ctx, result);
 394
 395         count = ldap_count_entries(idmap_alloc_ldap->smbldap_state->ldap_struct,
 396                                    result);
 397         if (count != 1) {
 398                 DEBUG(0,("Single %s object not found\n", LDAP_OBJ_IDPOOL));
 399                 goto done;
 400         }
 401
 402         entry = ldap_first_entry(idmap_alloc_ldap->smbldap_state->ldap_struct,
 403                                  result);
 404
 405         dn = smbldap_talloc_dn(ctx,
 406                                idmap_alloc_ldap->smbldap_state->ldap_struct,
 407                                entry);
 408         if ( ! dn) {
 409                 goto done;
 410         }
 411
 412         if ( ! (id_str = smbldap_talloc_single_attribute(idmap_alloc_ldap->smbldap_state->ldap_struct,
 413                                 entry, type, ctx))) {
 414                 DEBUG(0,("%s attribute not found\n", type));
 415                 ret = NT_STATUS_UNSUCCESSFUL;
 416                 goto done;
 417         }
 418
 419         xid->id = strtoul(id_str, NULL, 10);
 420
 421         /* make sure we still have room to grow */
 422
 423         switch (xid->type) {
 424         case ID_TYPE_UID:
 425                 if (xid->id > dom->high_id) {
 426                         DEBUG(0,("Cannot allocate uid above %lu!\n",
 427                                  (unsigned long)dom->high_id));
 428                         goto done;
 429                 }
 430                 break;
 431
 432         case ID_TYPE_GID:
 433                 if (xid->id > dom->high_id) {
 434                         DEBUG(0,("Cannot allocate gid above %lu!\n",
 435                                  (unsigned long)dom->high_id));
 436                         goto done;
 437                 }
 438                 break;
 439
 440         default:
 441                 /* impossible */
 442                 goto done;
 443         }
 444
 445         new_id_str = talloc_asprintf(ctx, "%lu", (unsigned long)xid->id + 1);
 446         if ( ! new_id_str) {
 447                 DEBUG(0,("Out of memory\n"));
 448                 ret = NT_STATUS_NO_MEMORY;
 449                 goto done;
 450         }
 451
 452         smbldap_set_mod(&mods, LDAP_MOD_DELETE, type, id_str);
 453         smbldap_set_mod(&mods, LDAP_MOD_ADD, type, new_id_str);
 454
 455         if (mods == NULL) {
 456                 DEBUG(0,("smbldap_set_mod() failed.\n"));
 457                 goto done;
 458         }
 459
 460         DEBUG(10, ("Try to atomically increment the id (%s -> %s)\n",
 461                    id_str, new_id_str));
 462
 463         rc = smbldap_modify(idmap_alloc_ldap->smbldap_state, dn, mods);
 464
 465         ldap_mods_free(mods, True);
 466
 467         if (rc != LDAP_SUCCESS) {
 468                 DEBUG(1,("Failed to allocate new %s. "
 469                          "smbldap_modify() failed.\n", type));
 470                 goto done;
 471         }
 472
 473         ret = NT_STATUS_OK;
 474
 475 done:
 476         talloc_free(ctx);
 477         return ret;
 478 }
 479
 480 /**********************************
 481  Close idmap ldap alloc
 482 **********************************/
 483
 484 static NTSTATUS idmap_ldap_alloc_close(void)
 485 {
 486         if (idmap_alloc_ldap) {
 487                 smbldap_free_struct(&idmap_alloc_ldap->smbldap_state);
 488                 DEBUG(5,("The connection to the LDAP server was closed\n"));
 489                 /* maybe free the results here --metze */
 490                 TALLOC_FREE(idmap_alloc_ldap);
 491         }
 492         return NT_STATUS_OK;
 493 }
 494
 495
 496 /**********************************************************************
 497  IDMAP MAPPING LDAP BACKEND
 498 **********************************************************************/
 499
 500 static int idmap_ldap_close_destructor(struct idmap_ldap_context *ctx)
 501 {
 502         smbldap_free_struct(&ctx->smbldap_state);
 503         DEBUG(5,("The connection to the LDAP server was closed\n"));
 504         /* maybe free the results here --metze */
 505
 506         return 0;
 507 }
 508
 509 /********************************
 510  Initialise idmap database.
 511 ********************************/
 512
 513 static NTSTATUS idmap_ldap_db_init(struct idmap_domain *dom,
 514                                    const char *params)
 515 {
 516         NTSTATUS ret;
 517         struct idmap_ldap_context *ctx = NULL;
 518         char *config_option = NULL;
 519         const char *tmp = NULL;
 520
 521         /* Only do init if we are online */
 522         if (idmap_is_offline()) {
 523                 return NT_STATUS_FILE_IS_OFFLINE;
 524         }
 525
 526         ctx = TALLOC_ZERO_P(dom, struct idmap_ldap_context);
 527         if ( ! ctx) {
 528                 DEBUG(0, ("Out of memory!\n"));
 529                 return NT_STATUS_NO_MEMORY;
 530         }
 531
 532         if (strequal(dom->name, "*")) {
 533                 /* more specific configuration can go here */
 534         } else {
 535                 config_option = talloc_asprintf(ctx, "idmap config %s", dom->name);
 536                 if ( ! config_option) {
 537                         DEBUG(0, ("Out of memory!\n"));
 538                         ret = NT_STATUS_NO_MEMORY;
 539                         goto done;
 540                 }
 541         }
 542
 543         if (params != NULL) {
 544                 /* assume location is the only parameter */
 545                 ctx->url = talloc_strdup(ctx, params);
 546         } else {
 547                 tmp = lp_parm_const_string(-1, config_option, "ldap_url", NULL);
 548
 549                 if ( ! tmp) {
 550                         DEBUG(1, ("ERROR: missing idmap ldap url\n"));
 551                         ret = NT_STATUS_UNSUCCESSFUL;
 552                         goto done;
 553                 }
 554
 555                 ctx->url = talloc_strdup(ctx, tmp);
 556         }
 557         CHECK_ALLOC_DONE(ctx->url);
 558
 559         trim_char(ctx->url, '\"', '\"');
 560
 561         tmp = lp_parm_const_string(-1, config_option, "ldap_base_dn", NULL);
 562         if ( ! tmp || ! *tmp) {
 563                 tmp = lp_ldap_idmap_suffix();
 564                 if ( ! tmp) {
 565                         DEBUG(1, ("ERROR: missing idmap ldap suffix\n"));
 566                         ret = NT_STATUS_UNSUCCESSFUL;
 567                         goto done;
 568                 }
 569         }
 570
 571         ctx->suffix = talloc_strdup(ctx, tmp);
 572         CHECK_ALLOC_DONE(ctx->suffix);
 573
 574         ret = smbldap_init(ctx, winbind_event_context(), ctx->url,
 575                            &ctx->smbldap_state);
 576         if (!NT_STATUS_IS_OK(ret)) {
 577                 DEBUG(1, ("ERROR: smbldap_init (%s) failed!\n", ctx->url));
 578                 goto done;
 579         }
 580
 581         ret = get_credentials( ctx, ctx->smbldap_state, config_option,
 582                                dom, &ctx->user_dn );
 583         if ( !NT_STATUS_IS_OK(ret) ) {
 584                 DEBUG(1,("idmap_ldap_db_init: Failed to get connection "
 585                          "credentials (%s)\n", nt_errstr(ret)));
 586                 goto done;
 587         }
 588
 589         /* set the destructor on the context, so that resource are properly
 590            freed if the contexts is released */
 591
 592         talloc_set_destructor(ctx, idmap_ldap_close_destructor);
 593
 594         dom->private_data = ctx;
 595
 596         talloc_free(config_option);
 597         return NT_STATUS_OK;
 598
 599 /*failed */
 600 done:
 601         talloc_free(ctx);
 602         return ret;
 603 }
 604
 605 /* max number of ids requested per batch query */
 606 #define IDMAP_LDAP_MAX_IDS 30
 607
 608 /**********************************
 609  lookup a set of unix ids.
 610 **********************************/
 611
 612 /* this function searches up to IDMAP_LDAP_MAX_IDS entries
 613  * in maps for a match */
 614 static struct id_map *find_map_by_id(struct id_map **maps,
 615                                      enum id_type type,
 616                                      uint32_t id)
 617 {
 618         int i;
 619
 620         for (i = 0; i < IDMAP_LDAP_MAX_IDS; i++) {
 621                 if (maps[i] == NULL) { /* end of the run */
 622                         return NULL;
 623                 }
 624                 if ((maps[i]->xid.type == type) && (maps[i]->xid.id == id)) {
 625                         return maps[i];
 626                 }
 627         }
 628
 629         return NULL;
 630 }
 631
 632 static NTSTATUS idmap_ldap_unixids_to_sids(struct idmap_domain *dom,
 633                                            struct id_map **ids)
 634 {
 635         NTSTATUS ret;
 636         TALLOC_CTX *memctx;
 637         struct idmap_ldap_context *ctx;
 638         LDAPMessage *result = NULL;
 639         LDAPMessage *entry = NULL;
 640         const char *uidNumber;
 641         const char *gidNumber;
 642         const char **attr_list;
 643         char *filter = NULL;
 644         bool multi = False;
 645         int idx = 0;
 646         int bidx = 0;
 647         int count;
 648         int rc;
 649         int i;
 650
 651         /* Only do query if we are online */
 652         if (idmap_is_offline()) {
 653                 return NT_STATUS_FILE_IS_OFFLINE;
 654         }
 655
 656         ctx = talloc_get_type(dom->private_data, struct idmap_ldap_context);
 657
 658         memctx = talloc_new(ctx);
 659         if ( ! memctx) {
 660                 DEBUG(0, ("Out of memory!\n"));
 661                 return NT_STATUS_NO_MEMORY;
 662         }
 663
 664         uidNumber = get_attr_key2string(idpool_attr_list, LDAP_ATTR_UIDNUMBER);
 665         gidNumber = get_attr_key2string(idpool_attr_list, LDAP_ATTR_GIDNUMBER);
 666
 667         attr_list = get_attr_list(memctx, sidmap_attr_list);
 668
 669         if ( ! ids[1]) {
 670                 /* if we are requested just one mapping use the simple filter */
 671
 672                 filter = talloc_asprintf(memctx, "(&(objectClass=%s)(%s=%lu))",
 673                                 LDAP_OBJ_IDMAP_ENTRY,
 674                                 (ids[0]->xid.type==ID_TYPE_UID)?uidNumber:gidNumber,
 675                                 (unsigned long)ids[0]->xid.id);
 676                 CHECK_ALLOC_DONE(filter);
 677                 DEBUG(10, ("Filter: [%s]\n", filter));
 678         } else {
 679                 /* multiple mappings */
 680                 multi = True;
 681         }
 682
 683         for (i = 0; ids[i]; i++) {
 684                 ids[i]->status = ID_UNKNOWN;
 685         }
 686
 687 again:
 688         if (multi) {
 689
 690                 talloc_free(filter);
 691                 filter = talloc_asprintf(memctx,
 692                                          "(&(objectClass=%s)(|",
 693                                          LDAP_OBJ_IDMAP_ENTRY);
 694                 CHECK_ALLOC_DONE(filter);
 695
 696                 bidx = idx;
 697                 for (i = 0; (i < IDMAP_LDAP_MAX_IDS) && ids[idx]; i++, idx++) {
 698                         filter = talloc_asprintf_append_buffer(filter, "(%s=%lu)",
 699                                         (ids[idx]->xid.type==ID_TYPE_UID)?uidNumber:gidNumber,
 700                                         (unsigned long)ids[idx]->xid.id);
 701                         CHECK_ALLOC_DONE(filter);
 702                 }
 703                 filter = talloc_asprintf_append_buffer(filter, "))");
 704                 CHECK_ALLOC_DONE(filter);
 705                 DEBUG(10, ("Filter: [%s]\n", filter));
 706         } else {
 707                 bidx = 0;
 708                 idx = 1;
 709         }
 710
 711         rc = smbldap_search(ctx->smbldap_state, ctx->suffix, LDAP_SCOPE_SUBTREE,
 712                 filter, attr_list, 0, &result);
 713
 714         if (rc != LDAP_SUCCESS) {
 715                 DEBUG(3,("Failure looking up ids (%s)\n", ldap_err2string(rc)));
 716                 ret = NT_STATUS_UNSUCCESSFUL;
 717                 goto done;
 718         }
 719
 720         count = ldap_count_entries(ctx->smbldap_state->ldap_struct, result);
 721
 722         if (count == 0) {
 723                 DEBUG(10, ("NO SIDs found\n"));
 724         }
 725
 726         for (i = 0; i < count; i++) {
 727                 char *sidstr = NULL;
 728                 char *tmp = NULL;
 729                 enum id_type type;
 730                 struct id_map *map;
 731                 uint32_t id;
 732
 733                 if (i == 0) { /* first entry */
 734                         entry = ldap_first_entry(ctx->smbldap_state->ldap_struct,
 735                                                  result);
 736                 } else { /* following ones */
 737                         entry = ldap_next_entry(ctx->smbldap_state->ldap_struct,
 738                                                 entry);
 739                 }
 740                 if ( ! entry) {
 741                         DEBUG(2, ("ERROR: Unable to fetch ldap entries "
 742                                   "from results\n"));
 743                         break;
 744                 }
 745
 746                 /* first check if the SID is present */
 747                 sidstr = smbldap_talloc_single_attribute(
 748                                 ctx->smbldap_state->ldap_struct,
 749                                 entry, LDAP_ATTRIBUTE_SID, memctx);
 750                 if ( ! sidstr) { /* no sid, skip entry */
 751                         DEBUG(2, ("WARNING SID not found on entry\n"));
 752                         continue;
 753                 }
 754
 755                 /* now try to see if it is a uid, if not try with a gid
 756                  * (gid is more common, but in case both uidNumber and
 757                  * gidNumber are returned the SID is mapped to the uid
 758                  *not the gid) */
 759                 type = ID_TYPE_UID;
 760                 tmp = smbldap_talloc_single_attribute(
 761                                 ctx->smbldap_state->ldap_struct,
 762                                 entry, uidNumber, memctx);
 763                 if ( ! tmp) {
 764                         type = ID_TYPE_GID;
 765                         tmp = smbldap_talloc_single_attribute(
 766                                         ctx->smbldap_state->ldap_struct,
 767                                         entry, gidNumber, memctx);
 768                 }
 769                 if ( ! tmp) { /* wow very strange entry, how did it match ? */
 770                         DEBUG(5, ("Unprobable match on (%s), no uidNumber, "
 771                                   "nor gidNumber returned\n", sidstr));
 772                         TALLOC_FREE(sidstr);
 773                         continue;
 774                 }
 775
 776                 id = strtoul(tmp, NULL, 10);
 777                 if (!idmap_unix_id_is_in_range(id, dom)) {
 778                         DEBUG(5, ("Requested id (%u) out of range (%u - %u). "
 779                                   "Filtered!\n", id,
 780                                   dom->low_id, dom->high_id));
 781                         TALLOC_FREE(sidstr);
 782                         TALLOC_FREE(tmp);
 783                         continue;
 784                 }
 785                 TALLOC_FREE(tmp);
 786
 787                 map = find_map_by_id(&ids[bidx], type, id);
 788                 if (!map) {
 789                         DEBUG(2, ("WARNING: couldn't match sid (%s) "
 790                                   "with requested ids\n", sidstr));
 791                         TALLOC_FREE(sidstr);
 792                         continue;
 793                 }
 794
 795                 if ( ! string_to_sid(map->sid, sidstr)) {
 796                         DEBUG(2, ("ERROR: Invalid SID on entry\n"));
 797                         TALLOC_FREE(sidstr);
 798                         continue;
 799                 }
 800
 801                 if (map->status == ID_MAPPED) {
 802                         DEBUG(1, ("WARNING: duplicate %s mapping in LDAP. "
 803                               "overwriting mapping %u -> %s with %u -> %s\n",
 804                               (type == ID_TYPE_UID) ? "UID" : "GID",
 805                               id, sid_string_dbg(map->sid), id, sidstr));
 806                 }
 807
 808                 TALLOC_FREE(sidstr);
 809
 810                 /* mapped */
 811                 map->status = ID_MAPPED;
 812
 813                 DEBUG(10, ("Mapped %s -> %lu (%d)\n", sid_string_dbg(map->sid),
 814                            (unsigned long)map->xid.id, map->xid.type));
 815         }
 816
 817         /* free the ldap results */
 818         if (result) {
 819                 ldap_msgfree(result);
 820                 result = NULL;
 821         }
 822
 823         if (multi && ids[idx]) { /* still some values to map */
 824                 goto again;
 825         }
 826
 827         ret = NT_STATUS_OK;
 828
 829         /* mark all unknwon/expired ones as unmapped */
 830         for (i = 0; ids[i]; i++) {
 831                 if (ids[i]->status != ID_MAPPED)
 832                         ids[i]->status = ID_UNMAPPED;
 833         }
 834
 835 done:
 836         talloc_free(memctx);
 837         return ret;
 838 }
 839
 840 /**********************************
 841  lookup a set of sids.
 842 **********************************/
 843
 844 /* this function searches up to IDMAP_LDAP_MAX_IDS entries
 845  * in maps for a match */
 846 static struct id_map *find_map_by_sid(struct id_map **maps, struct dom_sid *sid)
 847 {
 848         int i;
 849
 850         for (i = 0; i < IDMAP_LDAP_MAX_IDS; i++) {
 851                 if (maps[i] == NULL) { /* end of the run */
 852                         return NULL;
 853                 }
 854                 if (sid_equal(maps[i]->sid, sid)) {
 855                         return maps[i];
 856                 }
 857         }
 858
 859         return NULL;
 860 }
 861
 862 static NTSTATUS idmap_ldap_sids_to_unixids(struct idmap_domain *dom,
 863                                            struct id_map **ids)
 864 {
 865         LDAPMessage *entry = NULL;
 866         NTSTATUS ret;
 867         TALLOC_CTX *memctx;
 868         struct idmap_ldap_context *ctx;
 869         LDAPMessage *result = NULL;
 870         const char *uidNumber;
 871         const char *gidNumber;
 872         const char **attr_list;
 873         char *filter = NULL;
 874         bool multi = False;
 875         int idx = 0;
 876         int bidx = 0;
 877         int count;
 878         int rc;
 879         int i;
 880
 881         /* Only do query if we are online */
 882         if (idmap_is_offline()) {
 883                 return NT_STATUS_FILE_IS_OFFLINE;
 884         }
 885
 886         ctx = talloc_get_type(dom->private_data, struct idmap_ldap_context);
 887
 888         memctx = talloc_new(ctx);
 889         if ( ! memctx) {
 890                 DEBUG(0, ("Out of memory!\n"));
 891                 return NT_STATUS_NO_MEMORY;
 892         }
 893
 894         uidNumber = get_attr_key2string(idpool_attr_list, LDAP_ATTR_UIDNUMBER);
 895         gidNumber = get_attr_key2string(idpool_attr_list, LDAP_ATTR_GIDNUMBER);
 896
 897         attr_list = get_attr_list(memctx, sidmap_attr_list);
 898
 899         if ( ! ids[1]) {
 900                 /* if we are requested just one mapping use the simple filter */
 901
 902                 filter = talloc_asprintf(memctx, "(&(objectClass=%s)(%s=%s))",
 903                                 LDAP_OBJ_IDMAP_ENTRY,
 904                                 LDAP_ATTRIBUTE_SID,
 905                                 sid_string_talloc(memctx, ids[0]->sid));
 906                 CHECK_ALLOC_DONE(filter);
 907                 DEBUG(10, ("Filter: [%s]\n", filter));
 908         } else {
 909                 /* multiple mappings */
 910                 multi = True;
 911         }
 912
 913         for (i = 0; ids[i]; i++) {
 914                 ids[i]->status = ID_UNKNOWN;
 915         }
 916
 917 again:
 918         if (multi) {
 919
 920                 TALLOC_FREE(filter);
 921                 filter = talloc_asprintf(memctx,
 922                                          "(&(objectClass=%s)(|",
 923                                          LDAP_OBJ_IDMAP_ENTRY);
 924                 CHECK_ALLOC_DONE(filter);
 925
 926                 bidx = idx;
 927                 for (i = 0; (i < IDMAP_LDAP_MAX_IDS) && ids[idx]; i++, idx++) {
 928                         filter = talloc_asprintf_append_buffer(filter, "(%s=%s)",
 929                                         LDAP_ATTRIBUTE_SID,
 930                                         sid_string_talloc(memctx,
 931                                                           ids[idx]->sid));
 932                         CHECK_ALLOC_DONE(filter);
 933                 }
 934                 filter = talloc_asprintf_append_buffer(filter, "))");
 935                 CHECK_ALLOC_DONE(filter);
 936                 DEBUG(10, ("Filter: [%s]", filter));
 937         } else {
 938                 bidx = 0;
 939                 idx = 1;
 940         }
 941
 942         rc = smbldap_search(ctx->smbldap_state, ctx->suffix, LDAP_SCOPE_SUBTREE,
 943                 filter, attr_list, 0, &result);
 944
 945         if (rc != LDAP_SUCCESS) {
 946                 DEBUG(3,("Failure looking up sids (%s)\n",
 947                          ldap_err2string(rc)));
 948                 ret = NT_STATUS_UNSUCCESSFUL;
 949                 goto done;
 950         }
 951
 952         count = ldap_count_entries(ctx->smbldap_state->ldap_struct, result);
 953
 954         if (count == 0) {
 955                 DEBUG(10, ("NO SIDs found\n"));
 956         }
 957
 958         for (i = 0; i < count; i++) {
 959                 char *sidstr = NULL;
 960                 char *tmp = NULL;
 961                 enum id_type type;
 962                 struct id_map *map;
 963                 struct dom_sid sid;
 964                 uint32_t id;
 965
 966                 if (i == 0) { /* first entry */
 967                         entry = ldap_first_entry(ctx->smbldap_state->ldap_struct,
 968                                                  result);
 969                 } else { /* following ones */
 970                         entry = ldap_next_entry(ctx->smbldap_state->ldap_struct,
 971                                                 entry);
 972                 }
 973                 if ( ! entry) {
 974                         DEBUG(2, ("ERROR: Unable to fetch ldap entries "
 975                                   "from results\n"));
 976                         break;
 977                 }
 978
 979                 /* first check if the SID is present */
 980                 sidstr = smbldap_talloc_single_attribute(
 981                                 ctx->smbldap_state->ldap_struct,
 982                                 entry, LDAP_ATTRIBUTE_SID, memctx);
 983                 if ( ! sidstr) { /* no sid ??, skip entry */
 984                         DEBUG(2, ("WARNING SID not found on entry\n"));
 985                         continue;
 986                 }
 987
 988                 if ( ! string_to_sid(&sid, sidstr)) {
 989                         DEBUG(2, ("ERROR: Invalid SID on entry\n"));
 990                         TALLOC_FREE(sidstr);
 991                         continue;
 992                 }
 993
 994                 map = find_map_by_sid(&ids[bidx], &sid);
 995                 if (!map) {
 996                         DEBUG(2, ("WARNING: couldn't find entry sid (%s) "
 997                                   "in ids", sidstr));
 998                         TALLOC_FREE(sidstr);
 999                         continue;
1000                 }
1001
1002                 /* now try to see if it is a uid, if not try with a gid
1003                  * (gid is more common, but in case both uidNumber and
1004                  * gidNumber are returned the SID is mapped to the uid
1005                  * not the gid) */
1006                 type = ID_TYPE_UID;
1007                 tmp = smbldap_talloc_single_attribute(
1008                                 ctx->smbldap_state->ldap_struct,
1009                                 entry, uidNumber, memctx);
1010                 if ( ! tmp) {
1011                         type = ID_TYPE_GID;
1012                         tmp = smbldap_talloc_single_attribute(
1013                                         ctx->smbldap_state->ldap_struct,
1014                                         entry, gidNumber, memctx);
1015                 }
1016                 if ( ! tmp) { /* no ids ?? */
1017                         DEBUG(5, ("no uidNumber, "
1018                                   "nor gidNumber attributes found\n"));
1019                         TALLOC_FREE(sidstr);
1020                         continue;
1021                 }
1022
1023                 id = strtoul(tmp, NULL, 10);
1024                 if (!idmap_unix_id_is_in_range(id, dom)) {
1025                         DEBUG(5, ("Requested id (%u) out of range (%u - %u). "
1026                                   "Filtered!\n", id,
1027                                   dom->low_id, dom->high_id));
1028                         TALLOC_FREE(sidstr);
1029                         TALLOC_FREE(tmp);
1030                         continue;
1031                 }
1032                 TALLOC_FREE(tmp);
1033
1034                 if (map->status == ID_MAPPED) {
1035                         DEBUG(1, ("WARNING: duplicate %s mapping in LDAP. "
1036                               "overwriting mapping %s -> %u with %s -> %u\n",
1037                               (type == ID_TYPE_UID) ? "UID" : "GID",
1038                               sidstr, map->xid.id, sidstr, id));
1039                 }
1040
1041                 TALLOC_FREE(sidstr);
1042
1043                 /* mapped */
1044                 map->xid.type = type;
1045                 map->xid.id = id;
1046                 map->status = ID_MAPPED;
1047
1048                 DEBUG(10, ("Mapped %s -> %lu (%d)\n", sid_string_dbg(map->sid),
1049                            (unsigned long)map->xid.id, map->xid.type));
1050         }
1051
1052         /* free the ldap results */
1053         if (result) {
1054                 ldap_msgfree(result);
1055                 result = NULL;
1056         }
1057
1058         if (multi && ids[idx]) { /* still some values to map */
1059                 goto again;
1060         }
1061
1062         ret = NT_STATUS_OK;
1063
1064         /* mark all unknwon/expired ones as unmapped */
1065         for (i = 0; ids[i]; i++) {
1066                 if (ids[i]->status != ID_MAPPED)
1067                         ids[i]->status = ID_UNMAPPED;
1068         }
1069
1070 done:
1071         talloc_free(memctx);
1072         return ret;
1073 }
1074
1075 /**********************************
1076  set a mapping.
1077 **********************************/
1078
1079 /* TODO: change this:  This function cannot be called to modify a mapping,
1080  * only set a new one */
1081
1082 static NTSTATUS idmap_ldap_set_mapping(struct idmap_domain *dom,
1083                                        const struct id_map *map)
1084 {
1085         NTSTATUS ret;
1086         TALLOC_CTX *memctx;
1087         struct idmap_ldap_context *ctx;
1088         LDAPMessage *entry = NULL;
1089         LDAPMod **mods = NULL;
1090         const char *type;
1091         char *id_str;
1092         char *sid;
1093         char *dn;
1094         int rc = -1;
1095
1096         /* Only do query if we are online */
1097         if (idmap_is_offline()) {
1098                 return NT_STATUS_FILE_IS_OFFLINE;
1099         }
1100
1101         ctx = talloc_get_type(dom->private_data, struct idmap_ldap_context);
1102
1103         switch(map->xid.type) {
1104         case ID_TYPE_UID:
1105                 type = get_attr_key2string(sidmap_attr_list,
1106                                            LDAP_ATTR_UIDNUMBER);
1107                 break;
1108
1109         case ID_TYPE_GID:
1110                 type = get_attr_key2string(sidmap_attr_list,
1111                                            LDAP_ATTR_GIDNUMBER);
1112                 break;
1113
1114         default:
1115                 return NT_STATUS_INVALID_PARAMETER;
1116         }
1117
1118         memctx = talloc_new(ctx);
1119         if ( ! memctx) {
1120                 DEBUG(0, ("Out of memory!\n"));
1121                 return NT_STATUS_NO_MEMORY;
1122         }
1123
1124         id_str = talloc_asprintf(memctx, "%lu", (unsigned long)map->xid.id);
1125         CHECK_ALLOC_DONE(id_str);
1126
1127         sid = talloc_strdup(memctx, sid_string_talloc(memctx, map->sid));
1128         CHECK_ALLOC_DONE(sid);
1129
1130         dn = talloc_asprintf(memctx, "%s=%s,%s",
1131                         get_attr_key2string(sidmap_attr_list, LDAP_ATTR_SID),
1132                         sid,
1133                         ctx->suffix);
1134         CHECK_ALLOC_DONE(dn);
1135
1136         smbldap_set_mod(&mods, LDAP_MOD_ADD,
1137                         "objectClass", LDAP_OBJ_IDMAP_ENTRY);
1138
1139         smbldap_make_mod(ctx->smbldap_state->ldap_struct,
1140                          entry, &mods, type, id_str);
1141
1142         smbldap_make_mod(ctx->smbldap_state->ldap_struct, entry, &mods,
1143                          get_attr_key2string(sidmap_attr_list, LDAP_ATTR_SID),
1144                          sid);
1145
1146         if ( ! mods) {
1147                 DEBUG(2, ("ERROR: No mods?\n"));
1148                 ret = NT_STATUS_UNSUCCESSFUL;
1149                 goto done;
1150         }
1151
1152         /* TODO: remove conflicting mappings! */
1153
1154         smbldap_set_mod(&mods, LDAP_MOD_ADD, "objectClass", LDAP_OBJ_SID_ENTRY);
1155
1156         DEBUG(10, ("Set DN %s (%s -> %s)\n", dn, sid, id_str));
1157
1158         rc = smbldap_add(ctx->smbldap_state, dn, mods);
1159         ldap_mods_free(mods, True);
1160
1161         if (rc != LDAP_SUCCESS) {
1162                 char *ld_error = NULL;
1163                 ldap_get_option(ctx->smbldap_state->ldap_struct,
1164                                 LDAP_OPT_ERROR_STRING, &ld_error);
1165                 DEBUG(0,("ldap_set_mapping_internals: Failed to add %s to %lu "
1166                          "mapping [%s]\n", sid,
1167                          (unsigned long)map->xid.id, type));
1168                 DEBUG(0, ("ldap_set_mapping_internals: Error was: %s (%s)\n",
1169                         ld_error ? ld_error : "(NULL)", ldap_err2string (rc)));
1170                 if (ld_error) {
1171                         ldap_memfree(ld_error);
1172                 }
1173                 ret = NT_STATUS_UNSUCCESSFUL;
1174                 goto done;
1175         }
1176
1177         DEBUG(10,("ldap_set_mapping: Successfully created mapping from %s to "
1178                   "%lu [%s]\n", sid, (unsigned long)map->xid.id, type));
1179
1180         ret = NT_STATUS_OK;
1181
1182 done:
1183         talloc_free(memctx);
1184         return ret;
1185 }
1186
1187 /**********************************
1188  Close the idmap ldap instance
1189 **********************************/
1190
1191 static NTSTATUS idmap_ldap_close(struct idmap_domain *dom)
1192 {
1193         struct idmap_ldap_context *ctx;
1194
1195         if (dom->private_data) {
1196                 ctx = talloc_get_type(dom->private_data,
1197                                       struct idmap_ldap_context);
1198
1199                 talloc_free(ctx);
1200                 dom->private_data = NULL;
1201         }
1202
1203         return NT_STATUS_OK;
1204 }
1205
1206 static struct idmap_methods idmap_ldap_methods = {
1207
1208         .init = idmap_ldap_db_init,
1209         .unixids_to_sids = idmap_ldap_unixids_to_sids,
1210         .sids_to_unixids = idmap_ldap_sids_to_unixids,
1211         .allocate_id = idmap_ldap_get_new_id,
1212         .close_fn = idmap_ldap_close
1213 };
1214
1215 NTSTATUS idmap_ldap_init(void);
1216 NTSTATUS idmap_ldap_init(void)
1217 {
1218         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "ldap",
1219                                   &idmap_ldap_methods);
1220 }
1221