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    Copyright (C) Michael Adam           2010
  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 "secrets.h"
  29 #include "idmap.h"
  30 #include "idmap_rw.h"
  31 #include "../libcli/security/security.h"
  32
  33 #undef DBGC_CLASS
  34 #define DBGC_CLASS DBGC_IDMAP
  35
  36 #include <lber.h>
  37 #include <ldap.h>
  38
  39 #include "smbldap.h"
  40
  41 static char *idmap_fetch_secret(const char *backend,
  42                                 const char *domain, const char *identity)
  43 {
  44         char *tmp, *ret;
  45         int r;
  46
  47         r = asprintf(&tmp, "IDMAP_%s_%s", backend, domain);
  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         struct idmap_rw_ops *rw_ops;
  67 };
  68
  69 #define CHECK_ALLOC_DONE(mem) do { \
  70         if (!mem) { \
  71                 DEBUG(0, ("Out of memory!\n")); \
  72                 ret = NT_STATUS_NO_MEMORY; \
  73                 goto done; \
  74         } } while (0)
  75
  76 /**********************************************************************
  77  IDMAP ALLOC TDB BACKEND
  78 **********************************************************************/
  79
  80 /*********************************************************************
  81  ********************************************************************/
  82
  83 static NTSTATUS get_credentials( TALLOC_CTX *mem_ctx,
  84                                  struct smbldap_state *ldap_state,
  85                                  const char *config_option,
  86                                  struct idmap_domain *dom,
  87                                  char **dn )
  88 {
  89         NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
  90         char *secret = NULL;
  91         const char *tmp = NULL;
  92         char *user_dn = NULL;
  93         bool anon = False;
  94
  95         /* assume anonymous if we don't have a specified user */
  96
  97         tmp = lp_parm_const_string(-1, config_option, "ldap_user_dn", NULL);
  98
  99         if ( tmp ) {
 100                 if (!dom) {
 101                         DEBUG(0, ("get_credentials: Invalid domain 'NULL' "
 102                                   "encountered for user DN %s\n",
 103                                   tmp));
 104                         ret = NT_STATUS_UNSUCCESSFUL;
 105                         goto done;
 106                 } else {
 107                         secret = idmap_fetch_secret("ldap", dom->name, tmp);
 108                 }
 109
 110                 if (!secret) {
 111                         DEBUG(0, ("get_credentials: Unable to fetch "
 112                                   "auth credentials for %s in %s\n",
 113                                   tmp, (dom==NULL)?"ALLOC":dom->name));
 114                         ret = NT_STATUS_ACCESS_DENIED;
 115                         goto done;
 116                 }
 117                 *dn = talloc_strdup(mem_ctx, tmp);
 118                 CHECK_ALLOC_DONE(*dn);
 119         } else {
 120                 if (!fetch_ldap_pw(&user_dn, &secret)) {
 121                         DEBUG(2, ("get_credentials: Failed to lookup ldap "
 122                                   "bind creds. Using anonymous connection.\n"));
 123                         anon = True;
 124                         *dn = NULL;
 125                 } else {
 126                         *dn = talloc_strdup(mem_ctx, user_dn);
 127                         SAFE_FREE( user_dn );
 128                         CHECK_ALLOC_DONE(*dn);
 129                 }
 130         }
 131
 132         smbldap_set_creds(ldap_state, anon, *dn, secret);
 133         ret = NT_STATUS_OK;
 134
 135 done:
 136         SAFE_FREE(secret);
 137
 138         return ret;
 139 }
 140
 141
 142 /**********************************************************************
 143  Verify the sambaUnixIdPool entry in the directory.
 144 **********************************************************************/
 145
 146 static NTSTATUS verify_idpool(struct idmap_domain *dom)
 147 {
 148         NTSTATUS ret;
 149         TALLOC_CTX *mem_ctx;
 150         LDAPMessage *result = NULL;
 151         LDAPMod **mods = NULL;
 152         const char **attr_list;
 153         char *filter;
 154         int count;
 155         int rc;
 156         struct idmap_ldap_context *ctx;
 157
 158         ctx = talloc_get_type(dom->private_data, struct idmap_ldap_context);
 159
 160         mem_ctx = talloc_new(ctx);
 161         if (mem_ctx == NULL) {
 162                 DEBUG(0, ("Out of memory!\n"));
 163                 return NT_STATUS_NO_MEMORY;
 164         }
 165
 166         filter = talloc_asprintf(mem_ctx, "(objectclass=%s)", LDAP_OBJ_IDPOOL);
 167         CHECK_ALLOC_DONE(filter);
 168
 169         attr_list = get_attr_list(mem_ctx, idpool_attr_list);
 170         CHECK_ALLOC_DONE(attr_list);
 171
 172         rc = smbldap_search(ctx->smbldap_state,
 173                                 ctx->suffix,
 174                                 LDAP_SCOPE_SUBTREE,
 175                                 filter,
 176                                 attr_list,
 177                                 0,
 178                                 &result);
 179
 180         if (rc != LDAP_SUCCESS) {
 181                 DEBUG(1, ("Unable to verify the idpool, "
 182                           "cannot continue initialization!\n"));
 183                 return NT_STATUS_UNSUCCESSFUL;
 184         }
 185
 186         count = ldap_count_entries(ctx->smbldap_state->ldap_struct, result);
 187
 188         ldap_msgfree(result);
 189
 190         if ( count > 1 ) {
 191                 DEBUG(0,("Multiple entries returned from %s (base == %s)\n",
 192                         filter, ctx->suffix));
 193                 ret = NT_STATUS_UNSUCCESSFUL;
 194                 goto done;
 195         }
 196         else if (count == 0) {
 197                 char *uid_str, *gid_str;
 198
 199                 uid_str = talloc_asprintf(mem_ctx, "%lu",
 200                                 (unsigned long)dom->low_id);
 201                 gid_str = talloc_asprintf(mem_ctx, "%lu",
 202                                 (unsigned long)dom->low_id);
 203
 204                 smbldap_set_mod(&mods, LDAP_MOD_ADD,
 205                                 "objectClass", LDAP_OBJ_IDPOOL);
 206                 smbldap_set_mod(&mods, LDAP_MOD_ADD,
 207                                 get_attr_key2string(idpool_attr_list,
 208                                                     LDAP_ATTR_UIDNUMBER),
 209                                 uid_str);
 210                 smbldap_set_mod(&mods, LDAP_MOD_ADD,
 211                                 get_attr_key2string(idpool_attr_list,
 212                                                     LDAP_ATTR_GIDNUMBER),
 213                                 gid_str);
 214                 if (mods) {
 215                         rc = smbldap_modify(ctx->smbldap_state,
 216                                                 ctx->suffix,
 217                                                 mods);
 218                         ldap_mods_free(mods, True);
 219                 } else {
 220                         ret = NT_STATUS_UNSUCCESSFUL;
 221                         goto done;
 222                 }
 223         }
 224
 225         ret = (rc == LDAP_SUCCESS)?NT_STATUS_OK:NT_STATUS_UNSUCCESSFUL;
 226 done:
 227         talloc_free(mem_ctx);
 228         return ret;
 229 }
 230
 231 /********************************
 232  Allocate a new uid or gid
 233 ********************************/
 234
 235 static NTSTATUS idmap_ldap_allocate_id_internal(struct idmap_domain *dom,
 236                                                 struct unixid *xid)
 237 {
 238         TALLOC_CTX *mem_ctx;
 239         NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
 240         int rc = LDAP_SERVER_DOWN;
 241         int count = 0;
 242         LDAPMessage *result = NULL;
 243         LDAPMessage *entry = NULL;
 244         LDAPMod **mods = NULL;
 245         char *id_str;
 246         char *new_id_str;
 247         char *filter = NULL;
 248         const char *dn = NULL;
 249         const char **attr_list;
 250         const char *type;
 251         struct idmap_ldap_context *ctx;
 252
 253         /* Only do query if we are online */
 254         if (idmap_is_offline()) {
 255                 return NT_STATUS_FILE_IS_OFFLINE;
 256         }
 257
 258         ctx = talloc_get_type(dom->private_data, struct idmap_ldap_context);
 259
 260         mem_ctx = talloc_new(ctx);
 261         if (!mem_ctx) {
 262                 DEBUG(0, ("Out of memory!\n"));
 263                 return NT_STATUS_NO_MEMORY;
 264         }
 265
 266         /* get type */
 267         switch (xid->type) {
 268
 269         case ID_TYPE_UID:
 270                 type = get_attr_key2string(idpool_attr_list,
 271                                            LDAP_ATTR_UIDNUMBER);
 272                 break;
 273
 274         case ID_TYPE_GID:
 275                 type = get_attr_key2string(idpool_attr_list,
 276                                            LDAP_ATTR_GIDNUMBER);
 277                 break;
 278
 279         default:
 280                 DEBUG(2, ("Invalid ID type (0x%x)\n", xid->type));
 281                 return NT_STATUS_INVALID_PARAMETER;
 282         }
 283
 284         filter = talloc_asprintf(mem_ctx, "(objectClass=%s)", LDAP_OBJ_IDPOOL);
 285         CHECK_ALLOC_DONE(filter);
 286
 287         attr_list = get_attr_list(mem_ctx, idpool_attr_list);
 288         CHECK_ALLOC_DONE(attr_list);
 289
 290         DEBUG(10, ("Search of the id pool (filter: %s)\n", filter));
 291
 292         rc = smbldap_search(ctx->smbldap_state,
 293                            ctx->suffix,
 294                            LDAP_SCOPE_SUBTREE, filter,
 295                            attr_list, 0, &result);
 296
 297         if (rc != LDAP_SUCCESS) {
 298                 DEBUG(0,("%s object not found\n", LDAP_OBJ_IDPOOL));
 299                 goto done;
 300         }
 301
 302         talloc_autofree_ldapmsg(mem_ctx, result);
 303
 304         count = ldap_count_entries(ctx->smbldap_state->ldap_struct, result);
 305         if (count != 1) {
 306                 DEBUG(0,("Single %s object not found\n", LDAP_OBJ_IDPOOL));
 307                 goto done;
 308         }
 309
 310         entry = ldap_first_entry(ctx->smbldap_state->ldap_struct, result);
 311
 312         dn = smbldap_talloc_dn(mem_ctx,
 313                                ctx->smbldap_state->ldap_struct,
 314                                entry);
 315         if ( ! dn) {
 316                 goto done;
 317         }
 318
 319         id_str = smbldap_talloc_single_attribute(
 320                                 ctx->smbldap_state->ldap_struct,
 321                                 entry, type, mem_ctx);
 322         if (id_str == NULL) {
 323                 DEBUG(0,("%s attribute not found\n", type));
 324                 ret = NT_STATUS_UNSUCCESSFUL;
 325                 goto done;
 326         }
 327
 328         xid->id = strtoul(id_str, NULL, 10);
 329
 330         /* make sure we still have room to grow */
 331
 332         switch (xid->type) {
 333         case ID_TYPE_UID:
 334                 if (xid->id > dom->high_id) {
 335                         DEBUG(0,("Cannot allocate uid above %lu!\n",
 336                                  (unsigned long)dom->high_id));
 337                         goto done;
 338                 }
 339                 break;
 340
 341         case ID_TYPE_GID:
 342                 if (xid->id > dom->high_id) {
 343                         DEBUG(0,("Cannot allocate gid above %lu!\n",
 344                                  (unsigned long)dom->high_id));
 345                         goto done;
 346                 }
 347                 break;
 348
 349         default:
 350                 /* impossible */
 351                 goto done;
 352         }
 353
 354         new_id_str = talloc_asprintf(mem_ctx, "%lu", (unsigned long)xid->id + 1);
 355         if ( ! new_id_str) {
 356                 DEBUG(0,("Out of memory\n"));
 357                 ret = NT_STATUS_NO_MEMORY;
 358                 goto done;
 359         }
 360
 361         smbldap_set_mod(&mods, LDAP_MOD_DELETE, type, id_str);
 362         smbldap_set_mod(&mods, LDAP_MOD_ADD, type, new_id_str);
 363
 364         if (mods == NULL) {
 365                 DEBUG(0,("smbldap_set_mod() failed.\n"));
 366                 goto done;
 367         }
 368
 369         DEBUG(10, ("Try to atomically increment the id (%s -> %s)\n",
 370                    id_str, new_id_str));
 371
 372         rc = smbldap_modify(ctx->smbldap_state, dn, mods);
 373
 374         ldap_mods_free(mods, True);
 375
 376         if (rc != LDAP_SUCCESS) {
 377                 DEBUG(1,("Failed to allocate new %s. "
 378                          "smbldap_modify() failed.\n", type));
 379                 goto done;
 380         }
 381
 382         ret = NT_STATUS_OK;
 383
 384 done:
 385         talloc_free(mem_ctx);
 386         return ret;
 387 }
 388
 389 /**
 390  * Allocate a new unix-ID.
 391  * For now this is for the default idmap domain only.
 392  * Should be extended later on.
 393  */
 394 static NTSTATUS idmap_ldap_allocate_id(struct idmap_domain *dom,
 395                                        struct unixid *id)
 396 {
 397         NTSTATUS ret;
 398
 399         if (!strequal(dom->name, "*")) {
 400                 DEBUG(3, ("idmap_ldap_allocate_id: "
 401                           "Refusing allocation of a new unixid for domain'%s'. "
 402                           "This is only supported for the default "
 403                           "domain \"*\".\n",
 404                            dom->name));
 405                 return NT_STATUS_NOT_IMPLEMENTED;
 406         }
 407
 408         ret = idmap_ldap_allocate_id_internal(dom, id);
 409
 410         return ret;
 411 }
 412
 413
 414 /**********************************************************************
 415  IDMAP MAPPING LDAP BACKEND
 416 **********************************************************************/
 417
 418 static int idmap_ldap_close_destructor(struct idmap_ldap_context *ctx)
 419 {
 420         smbldap_free_struct(&ctx->smbldap_state);
 421         DEBUG(5,("The connection to the LDAP server was closed\n"));
 422         /* maybe free the results here --metze */
 423
 424         return 0;
 425 }
 426
 427 /********************************
 428  Initialise idmap database.
 429 ********************************/
 430
 431 static NTSTATUS idmap_ldap_set_mapping(struct idmap_domain *dom,
 432                                        const struct id_map *map);
 433
 434 static NTSTATUS idmap_ldap_db_init(struct idmap_domain *dom)
 435 {
 436         NTSTATUS ret;
 437         struct idmap_ldap_context *ctx = NULL;
 438         char *config_option = NULL;
 439         const char *tmp = NULL;
 440
 441         /* Only do init if we are online */
 442         if (idmap_is_offline()) {
 443                 return NT_STATUS_FILE_IS_OFFLINE;
 444         }
 445
 446         ctx = TALLOC_ZERO_P(dom, struct idmap_ldap_context);
 447         if ( ! ctx) {
 448                 DEBUG(0, ("Out of memory!\n"));
 449                 return NT_STATUS_NO_MEMORY;
 450         }
 451
 452         config_option = talloc_asprintf(ctx, "idmap config %s", dom->name);
 453         if (!config_option) {
 454                 DEBUG(0, ("Out of memory!\n"));
 455                 ret = NT_STATUS_NO_MEMORY;
 456                 goto done;
 457         }
 458
 459         tmp = lp_parm_const_string(-1, config_option, "ldap_url", NULL);
 460
 461         if ( ! tmp) {
 462                 DEBUG(1, ("ERROR: missing idmap ldap url\n"));
 463                 ret = NT_STATUS_UNSUCCESSFUL;
 464                 goto done;
 465         }
 466
 467         ctx->url = talloc_strdup(ctx, tmp);
 468
 469         trim_char(ctx->url, '\"', '\"');
 470
 471         tmp = lp_parm_const_string(-1, config_option, "ldap_base_dn", NULL);
 472         if ( ! tmp || ! *tmp) {
 473                 tmp = lp_ldap_idmap_suffix();
 474                 if ( ! tmp) {
 475                         DEBUG(1, ("ERROR: missing idmap ldap suffix\n"));
 476                         ret = NT_STATUS_UNSUCCESSFUL;
 477                         goto done;
 478                 }
 479         }
 480
 481         ctx->suffix = talloc_strdup(ctx, tmp);
 482         CHECK_ALLOC_DONE(ctx->suffix);
 483
 484         ctx->rw_ops = talloc_zero(ctx, struct idmap_rw_ops);
 485         CHECK_ALLOC_DONE(ctx->rw_ops);
 486
 487         ctx->rw_ops->get_new_id = idmap_ldap_allocate_id_internal;
 488         ctx->rw_ops->set_mapping = idmap_ldap_set_mapping;
 489
 490         ret = smbldap_init(ctx, winbind_event_context(), ctx->url,
 491                            &ctx->smbldap_state);
 492         if (!NT_STATUS_IS_OK(ret)) {
 493                 DEBUG(1, ("ERROR: smbldap_init (%s) failed!\n", ctx->url));
 494                 goto done;
 495         }
 496
 497         ret = get_credentials( ctx, ctx->smbldap_state, config_option,
 498                                dom, &ctx->user_dn );
 499         if ( !NT_STATUS_IS_OK(ret) ) {
 500                 DEBUG(1,("idmap_ldap_db_init: Failed to get connection "
 501                          "credentials (%s)\n", nt_errstr(ret)));
 502                 goto done;
 503         }
 504
 505         /*
 506          * Set the destructor on the context, so that resources are
 507          * properly freed when the context is released.
 508          */
 509         talloc_set_destructor(ctx, idmap_ldap_close_destructor);
 510
 511         dom->private_data = ctx;
 512
 513         ret = verify_idpool(dom);
 514         if (!NT_STATUS_IS_OK(ret)) {
 515                 DEBUG(1, ("idmap_ldap_db_init: failed to verify ID pool (%s)\n",
 516                          nt_errstr(ret)));
 517                 goto done;
 518         }
 519
 520         talloc_free(config_option);
 521         return NT_STATUS_OK;
 522
 523 /*failed */
 524 done:
 525         talloc_free(ctx);
 526         return ret;
 527 }
 528
 529 /**
 530  * set a mapping.
 531  */
 532
 533 /* TODO: change this:  This function cannot be called to modify a mapping,
 534  * only set a new one */
 535
 536 static NTSTATUS idmap_ldap_set_mapping(struct idmap_domain *dom,
 537                                        const struct id_map *map)
 538 {
 539         NTSTATUS ret;
 540         TALLOC_CTX *memctx;
 541         struct idmap_ldap_context *ctx;
 542         LDAPMessage *entry = NULL;
 543         LDAPMod **mods = NULL;
 544         const char *type;
 545         char *id_str;
 546         char *sid;
 547         char *dn;
 548         int rc = -1;
 549
 550         /* Only do query if we are online */
 551         if (idmap_is_offline()) {
 552                 return NT_STATUS_FILE_IS_OFFLINE;
 553         }
 554
 555         ctx = talloc_get_type(dom->private_data, struct idmap_ldap_context);
 556
 557         switch(map->xid.type) {
 558         case ID_TYPE_UID:
 559                 type = get_attr_key2string(sidmap_attr_list,
 560                                            LDAP_ATTR_UIDNUMBER);
 561                 break;
 562
 563         case ID_TYPE_GID:
 564                 type = get_attr_key2string(sidmap_attr_list,
 565                                            LDAP_ATTR_GIDNUMBER);
 566                 break;
 567
 568         default:
 569                 return NT_STATUS_INVALID_PARAMETER;
 570         }
 571
 572         memctx = talloc_new(ctx);
 573         if ( ! memctx) {
 574                 DEBUG(0, ("Out of memory!\n"));
 575                 return NT_STATUS_NO_MEMORY;
 576         }
 577
 578         id_str = talloc_asprintf(memctx, "%lu", (unsigned long)map->xid.id);
 579         CHECK_ALLOC_DONE(id_str);
 580
 581         sid = talloc_strdup(memctx, sid_string_talloc(memctx, map->sid));
 582         CHECK_ALLOC_DONE(sid);
 583
 584         dn = talloc_asprintf(memctx, "%s=%s,%s",
 585                         get_attr_key2string(sidmap_attr_list, LDAP_ATTR_SID),
 586                         sid,
 587                         ctx->suffix);
 588         CHECK_ALLOC_DONE(dn);
 589
 590         smbldap_set_mod(&mods, LDAP_MOD_ADD,
 591                         "objectClass", LDAP_OBJ_IDMAP_ENTRY);
 592
 593         smbldap_make_mod(ctx->smbldap_state->ldap_struct,
 594                          entry, &mods, type, id_str);
 595
 596         smbldap_make_mod(ctx->smbldap_state->ldap_struct, entry, &mods,
 597                          get_attr_key2string(sidmap_attr_list, LDAP_ATTR_SID),
 598                          sid);
 599
 600         if ( ! mods) {
 601                 DEBUG(2, ("ERROR: No mods?\n"));
 602                 ret = NT_STATUS_UNSUCCESSFUL;
 603                 goto done;
 604         }
 605
 606         /* TODO: remove conflicting mappings! */
 607
 608         smbldap_set_mod(&mods, LDAP_MOD_ADD, "objectClass", LDAP_OBJ_SID_ENTRY);
 609
 610         DEBUG(10, ("Set DN %s (%s -> %s)\n", dn, sid, id_str));
 611
 612         rc = smbldap_add(ctx->smbldap_state, dn, mods);
 613         ldap_mods_free(mods, True);
 614
 615         if (rc != LDAP_SUCCESS) {
 616                 char *ld_error = NULL;
 617                 ldap_get_option(ctx->smbldap_state->ldap_struct,
 618                                 LDAP_OPT_ERROR_STRING, &ld_error);
 619                 DEBUG(0,("ldap_set_mapping_internals: Failed to add %s to %lu "
 620                          "mapping [%s]\n", sid,
 621                          (unsigned long)map->xid.id, type));
 622                 DEBUG(0, ("ldap_set_mapping_internals: Error was: %s (%s)\n",
 623                         ld_error ? ld_error : "(NULL)", ldap_err2string (rc)));
 624                 if (ld_error) {
 625                         ldap_memfree(ld_error);
 626                 }
 627                 ret = NT_STATUS_UNSUCCESSFUL;
 628                 goto done;
 629         }
 630
 631         DEBUG(10,("ldap_set_mapping: Successfully created mapping from %s to "
 632                   "%lu [%s]\n", sid, (unsigned long)map->xid.id, type));
 633
 634         ret = NT_STATUS_OK;
 635
 636 done:
 637         talloc_free(memctx);
 638         return ret;
 639 }
 640
 641 /**
 642  * Create a new mapping for an unmapped SID, also allocating a new ID.
 643  * If possible, this should be run inside a transaction to make the
 644  * action atomic.
 645  */
 646 static NTSTATUS idmap_ldap_new_mapping(struct idmap_domain *dom, struct id_map *map)
 647 {
 648         NTSTATUS ret;
 649         struct idmap_ldap_context *ctx;
 650
 651         ctx = talloc_get_type(dom->private_data, struct idmap_ldap_context);
 652
 653         ret = idmap_rw_new_mapping(dom, ctx->rw_ops, map);
 654
 655         return ret;
 656 }
 657
 658
 659 /* max number of ids requested per batch query */
 660 #define IDMAP_LDAP_MAX_IDS 30
 661
 662 /**********************************
 663  lookup a set of unix ids.
 664 **********************************/
 665
 666 /* this function searches up to IDMAP_LDAP_MAX_IDS entries
 667  * in maps for a match */
 668 static struct id_map *find_map_by_id(struct id_map **maps,
 669                                      enum id_type type,
 670                                      uint32_t id)
 671 {
 672         int i;
 673
 674         for (i = 0; i < IDMAP_LDAP_MAX_IDS; i++) {
 675                 if (maps[i] == NULL) { /* end of the run */
 676                         return NULL;
 677                 }
 678                 if ((maps[i]->xid.type == type) && (maps[i]->xid.id == id)) {
 679                         return maps[i];
 680                 }
 681         }
 682
 683         return NULL;
 684 }
 685
 686 static NTSTATUS idmap_ldap_unixids_to_sids(struct idmap_domain *dom,
 687                                            struct id_map **ids)
 688 {
 689         NTSTATUS ret;
 690         TALLOC_CTX *memctx;
 691         struct idmap_ldap_context *ctx;
 692         LDAPMessage *result = NULL;
 693         LDAPMessage *entry = NULL;
 694         const char *uidNumber;
 695         const char *gidNumber;
 696         const char **attr_list;
 697         char *filter = NULL;
 698         bool multi = False;
 699         int idx = 0;
 700         int bidx = 0;
 701         int count;
 702         int rc;
 703         int i;
 704
 705         /* Only do query if we are online */
 706         if (idmap_is_offline()) {
 707                 return NT_STATUS_FILE_IS_OFFLINE;
 708         }
 709
 710         ctx = talloc_get_type(dom->private_data, struct idmap_ldap_context);
 711
 712         memctx = talloc_new(ctx);
 713         if ( ! memctx) {
 714                 DEBUG(0, ("Out of memory!\n"));
 715                 return NT_STATUS_NO_MEMORY;
 716         }
 717
 718         uidNumber = get_attr_key2string(idpool_attr_list, LDAP_ATTR_UIDNUMBER);
 719         gidNumber = get_attr_key2string(idpool_attr_list, LDAP_ATTR_GIDNUMBER);
 720
 721         attr_list = get_attr_list(memctx, sidmap_attr_list);
 722
 723         if ( ! ids[1]) {
 724                 /* if we are requested just one mapping use the simple filter */
 725
 726                 filter = talloc_asprintf(memctx, "(&(objectClass=%s)(%s=%lu))",
 727                                 LDAP_OBJ_IDMAP_ENTRY,
 728                                 (ids[0]->xid.type==ID_TYPE_UID)?uidNumber:gidNumber,
 729                                 (unsigned long)ids[0]->xid.id);
 730                 CHECK_ALLOC_DONE(filter);
 731                 DEBUG(10, ("Filter: [%s]\n", filter));
 732         } else {
 733                 /* multiple mappings */
 734                 multi = True;
 735         }
 736
 737         for (i = 0; ids[i]; i++) {
 738                 ids[i]->status = ID_UNKNOWN;
 739         }
 740
 741 again:
 742         if (multi) {
 743
 744                 talloc_free(filter);
 745                 filter = talloc_asprintf(memctx,
 746                                          "(&(objectClass=%s)(|",
 747                                          LDAP_OBJ_IDMAP_ENTRY);
 748                 CHECK_ALLOC_DONE(filter);
 749
 750                 bidx = idx;
 751                 for (i = 0; (i < IDMAP_LDAP_MAX_IDS) && ids[idx]; i++, idx++) {
 752                         filter = talloc_asprintf_append_buffer(filter, "(%s=%lu)",
 753                                         (ids[idx]->xid.type==ID_TYPE_UID)?uidNumber:gidNumber,
 754                                         (unsigned long)ids[idx]->xid.id);
 755                         CHECK_ALLOC_DONE(filter);
 756                 }
 757                 filter = talloc_asprintf_append_buffer(filter, "))");
 758                 CHECK_ALLOC_DONE(filter);
 759                 DEBUG(10, ("Filter: [%s]\n", filter));
 760         } else {
 761                 bidx = 0;
 762                 idx = 1;
 763         }
 764
 765         rc = smbldap_search(ctx->smbldap_state, ctx->suffix, LDAP_SCOPE_SUBTREE,
 766                 filter, attr_list, 0, &result);
 767
 768         if (rc != LDAP_SUCCESS) {
 769                 DEBUG(3,("Failure looking up ids (%s)\n", ldap_err2string(rc)));
 770                 ret = NT_STATUS_UNSUCCESSFUL;
 771                 goto done;
 772         }
 773
 774         count = ldap_count_entries(ctx->smbldap_state->ldap_struct, result);
 775
 776         if (count == 0) {
 777                 DEBUG(10, ("NO SIDs found\n"));
 778         }
 779
 780         for (i = 0; i < count; i++) {
 781                 char *sidstr = NULL;
 782                 char *tmp = NULL;
 783                 enum id_type type;
 784                 struct id_map *map;
 785                 uint32_t id;
 786
 787                 if (i == 0) { /* first entry */
 788                         entry = ldap_first_entry(ctx->smbldap_state->ldap_struct,
 789                                                  result);
 790                 } else { /* following ones */
 791                         entry = ldap_next_entry(ctx->smbldap_state->ldap_struct,
 792                                                 entry);
 793                 }
 794                 if ( ! entry) {
 795                         DEBUG(2, ("ERROR: Unable to fetch ldap entries "
 796                                   "from results\n"));
 797                         break;
 798                 }
 799
 800                 /* first check if the SID is present */
 801                 sidstr = smbldap_talloc_single_attribute(
 802                                 ctx->smbldap_state->ldap_struct,
 803                                 entry, LDAP_ATTRIBUTE_SID, memctx);
 804                 if ( ! sidstr) { /* no sid, skip entry */
 805                         DEBUG(2, ("WARNING SID not found on entry\n"));
 806                         continue;
 807                 }
 808
 809                 /* now try to see if it is a uid, if not try with a gid
 810                  * (gid is more common, but in case both uidNumber and
 811                  * gidNumber are returned the SID is mapped to the uid
 812                  *not the gid) */
 813                 type = ID_TYPE_UID;
 814                 tmp = smbldap_talloc_single_attribute(
 815                                 ctx->smbldap_state->ldap_struct,
 816                                 entry, uidNumber, memctx);
 817                 if ( ! tmp) {
 818                         type = ID_TYPE_GID;
 819                         tmp = smbldap_talloc_single_attribute(
 820                                         ctx->smbldap_state->ldap_struct,
 821                                         entry, gidNumber, memctx);
 822                 }
 823                 if ( ! tmp) { /* wow very strange entry, how did it match ? */
 824                         DEBUG(5, ("Unprobable match on (%s), no uidNumber, "
 825                                   "nor gidNumber returned\n", sidstr));
 826                         TALLOC_FREE(sidstr);
 827                         continue;
 828                 }
 829
 830                 id = strtoul(tmp, NULL, 10);
 831                 if (!idmap_unix_id_is_in_range(id, dom)) {
 832                         DEBUG(5, ("Requested id (%u) out of range (%u - %u). "
 833                                   "Filtered!\n", id,
 834                                   dom->low_id, dom->high_id));
 835                         TALLOC_FREE(sidstr);
 836                         TALLOC_FREE(tmp);
 837                         continue;
 838                 }
 839                 TALLOC_FREE(tmp);
 840
 841                 map = find_map_by_id(&ids[bidx], type, id);
 842                 if (!map) {
 843                         DEBUG(2, ("WARNING: couldn't match sid (%s) "
 844                                   "with requested ids\n", sidstr));
 845                         TALLOC_FREE(sidstr);
 846                         continue;
 847                 }
 848
 849                 if ( ! string_to_sid(map->sid, sidstr)) {
 850                         DEBUG(2, ("ERROR: Invalid SID on entry\n"));
 851                         TALLOC_FREE(sidstr);
 852                         continue;
 853                 }
 854
 855                 if (map->status == ID_MAPPED) {
 856                         DEBUG(1, ("WARNING: duplicate %s mapping in LDAP. "
 857                               "overwriting mapping %u -> %s with %u -> %s\n",
 858                               (type == ID_TYPE_UID) ? "UID" : "GID",
 859                               id, sid_string_dbg(map->sid), id, sidstr));
 860                 }
 861
 862                 TALLOC_FREE(sidstr);
 863
 864                 /* mapped */
 865                 map->status = ID_MAPPED;
 866
 867                 DEBUG(10, ("Mapped %s -> %lu (%d)\n", sid_string_dbg(map->sid),
 868                            (unsigned long)map->xid.id, map->xid.type));
 869         }
 870
 871         /* free the ldap results */
 872         if (result) {
 873                 ldap_msgfree(result);
 874                 result = NULL;
 875         }
 876
 877         if (multi && ids[idx]) { /* still some values to map */
 878                 goto again;
 879         }
 880
 881         ret = NT_STATUS_OK;
 882
 883         /* mark all unknwon/expired ones as unmapped */
 884         for (i = 0; ids[i]; i++) {
 885                 if (ids[i]->status != ID_MAPPED)
 886                         ids[i]->status = ID_UNMAPPED;
 887         }
 888
 889 done:
 890         talloc_free(memctx);
 891         return ret;
 892 }
 893
 894 /**********************************
 895  lookup a set of sids.
 896 **********************************/
 897
 898 /* this function searches up to IDMAP_LDAP_MAX_IDS entries
 899  * in maps for a match */
 900 static struct id_map *find_map_by_sid(struct id_map **maps, struct dom_sid *sid)
 901 {
 902         int i;
 903
 904         for (i = 0; i < IDMAP_LDAP_MAX_IDS; i++) {
 905                 if (maps[i] == NULL) { /* end of the run */
 906                         return NULL;
 907                 }
 908                 if (dom_sid_equal(maps[i]->sid, sid)) {
 909                         return maps[i];
 910                 }
 911         }
 912
 913         return NULL;
 914 }
 915
 916 static NTSTATUS idmap_ldap_sids_to_unixids(struct idmap_domain *dom,
 917                                            struct id_map **ids)
 918 {
 919         LDAPMessage *entry = NULL;
 920         NTSTATUS ret;
 921         TALLOC_CTX *memctx;
 922         struct idmap_ldap_context *ctx;
 923         LDAPMessage *result = NULL;
 924         const char *uidNumber;
 925         const char *gidNumber;
 926         const char **attr_list;
 927         char *filter = NULL;
 928         bool multi = False;
 929         int idx = 0;
 930         int bidx = 0;
 931         int count;
 932         int rc;
 933         int i;
 934
 935         /* Only do query if we are online */
 936         if (idmap_is_offline()) {
 937                 return NT_STATUS_FILE_IS_OFFLINE;
 938         }
 939
 940         ctx = talloc_get_type(dom->private_data, struct idmap_ldap_context);
 941
 942         memctx = talloc_new(ctx);
 943         if ( ! memctx) {
 944                 DEBUG(0, ("Out of memory!\n"));
 945                 return NT_STATUS_NO_MEMORY;
 946         }
 947
 948         uidNumber = get_attr_key2string(idpool_attr_list, LDAP_ATTR_UIDNUMBER);
 949         gidNumber = get_attr_key2string(idpool_attr_list, LDAP_ATTR_GIDNUMBER);
 950
 951         attr_list = get_attr_list(memctx, sidmap_attr_list);
 952
 953         if ( ! ids[1]) {
 954                 /* if we are requested just one mapping use the simple filter */
 955
 956                 filter = talloc_asprintf(memctx, "(&(objectClass=%s)(%s=%s))",
 957                                 LDAP_OBJ_IDMAP_ENTRY,
 958                                 LDAP_ATTRIBUTE_SID,
 959                                 sid_string_talloc(memctx, ids[0]->sid));
 960                 CHECK_ALLOC_DONE(filter);
 961                 DEBUG(10, ("Filter: [%s]\n", filter));
 962         } else {
 963                 /* multiple mappings */
 964                 multi = True;
 965         }
 966
 967         for (i = 0; ids[i]; i++) {
 968                 ids[i]->status = ID_UNKNOWN;
 969         }
 970
 971 again:
 972         if (multi) {
 973
 974                 TALLOC_FREE(filter);
 975                 filter = talloc_asprintf(memctx,
 976                                          "(&(objectClass=%s)(|",
 977                                          LDAP_OBJ_IDMAP_ENTRY);
 978                 CHECK_ALLOC_DONE(filter);
 979
 980                 bidx = idx;
 981                 for (i = 0; (i < IDMAP_LDAP_MAX_IDS) && ids[idx]; i++, idx++) {
 982                         filter = talloc_asprintf_append_buffer(filter, "(%s=%s)",
 983                                         LDAP_ATTRIBUTE_SID,
 984                                         sid_string_talloc(memctx,
 985                                                           ids[idx]->sid));
 986                         CHECK_ALLOC_DONE(filter);
 987                 }
 988                 filter = talloc_asprintf_append_buffer(filter, "))");
 989                 CHECK_ALLOC_DONE(filter);
 990                 DEBUG(10, ("Filter: [%s]", filter));
 991         } else {
 992                 bidx = 0;
 993                 idx = 1;
 994         }
 995
 996         rc = smbldap_search(ctx->smbldap_state, ctx->suffix, LDAP_SCOPE_SUBTREE,
 997                 filter, attr_list, 0, &result);
 998
 999         if (rc != LDAP_SUCCESS) {
1000                 DEBUG(3,("Failure looking up sids (%s)\n",
1001                          ldap_err2string(rc)));
1002                 ret = NT_STATUS_UNSUCCESSFUL;
1003                 goto done;
1004         }
1005
1006         count = ldap_count_entries(ctx->smbldap_state->ldap_struct, result);
1007
1008         if (count == 0) {
1009                 DEBUG(10, ("NO SIDs found\n"));
1010         }
1011
1012         for (i = 0; i < count; i++) {
1013                 char *sidstr = NULL;
1014                 char *tmp = NULL;
1015                 enum id_type type;
1016                 struct id_map *map;
1017                 struct dom_sid sid;
1018                 uint32_t id;
1019
1020                 if (i == 0) { /* first entry */
1021                         entry = ldap_first_entry(ctx->smbldap_state->ldap_struct,
1022                                                  result);
1023                 } else { /* following ones */
1024                         entry = ldap_next_entry(ctx->smbldap_state->ldap_struct,
1025                                                 entry);
1026                 }
1027                 if ( ! entry) {
1028                         DEBUG(2, ("ERROR: Unable to fetch ldap entries "
1029                                   "from results\n"));
1030                         break;
1031                 }
1032
1033                 /* first check if the SID is present */
1034                 sidstr = smbldap_talloc_single_attribute(
1035                                 ctx->smbldap_state->ldap_struct,
1036                                 entry, LDAP_ATTRIBUTE_SID, memctx);
1037                 if ( ! sidstr) { /* no sid ??, skip entry */
1038                         DEBUG(2, ("WARNING SID not found on entry\n"));
1039                         continue;
1040                 }
1041
1042                 if ( ! string_to_sid(&sid, sidstr)) {
1043                         DEBUG(2, ("ERROR: Invalid SID on entry\n"));
1044                         TALLOC_FREE(sidstr);
1045                         continue;
1046                 }
1047
1048                 map = find_map_by_sid(&ids[bidx], &sid);
1049                 if (!map) {
1050                         DEBUG(2, ("WARNING: couldn't find entry sid (%s) "
1051                                   "in ids", sidstr));
1052                         TALLOC_FREE(sidstr);
1053                         continue;
1054                 }
1055
1056                 /* now try to see if it is a uid, if not try with a gid
1057                  * (gid is more common, but in case both uidNumber and
1058                  * gidNumber are returned the SID is mapped to the uid
1059                  * not the gid) */
1060                 type = ID_TYPE_UID;
1061                 tmp = smbldap_talloc_single_attribute(
1062                                 ctx->smbldap_state->ldap_struct,
1063                                 entry, uidNumber, memctx);
1064                 if ( ! tmp) {
1065                         type = ID_TYPE_GID;
1066                         tmp = smbldap_talloc_single_attribute(
1067                                         ctx->smbldap_state->ldap_struct,
1068                                         entry, gidNumber, memctx);
1069                 }
1070                 if ( ! tmp) { /* no ids ?? */
1071                         DEBUG(5, ("no uidNumber, "
1072                                   "nor gidNumber attributes found\n"));
1073                         TALLOC_FREE(sidstr);
1074                         continue;
1075                 }
1076
1077                 id = strtoul(tmp, NULL, 10);
1078                 if (!idmap_unix_id_is_in_range(id, dom)) {
1079                         DEBUG(5, ("Requested id (%u) out of range (%u - %u). "
1080                                   "Filtered!\n", id,
1081                                   dom->low_id, dom->high_id));
1082                         TALLOC_FREE(sidstr);
1083                         TALLOC_FREE(tmp);
1084                         continue;
1085                 }
1086                 TALLOC_FREE(tmp);
1087
1088                 if (map->status == ID_MAPPED) {
1089                         DEBUG(1, ("WARNING: duplicate %s mapping in LDAP. "
1090                               "overwriting mapping %s -> %u with %s -> %u\n",
1091                               (type == ID_TYPE_UID) ? "UID" : "GID",
1092                               sidstr, map->xid.id, sidstr, id));
1093                 }
1094
1095                 TALLOC_FREE(sidstr);
1096
1097                 /* mapped */
1098                 map->xid.type = type;
1099                 map->xid.id = id;
1100                 map->status = ID_MAPPED;
1101
1102                 DEBUG(10, ("Mapped %s -> %lu (%d)\n", sid_string_dbg(map->sid),
1103                            (unsigned long)map->xid.id, map->xid.type));
1104         }
1105
1106         /* free the ldap results */
1107         if (result) {
1108                 ldap_msgfree(result);
1109                 result = NULL;
1110         }
1111
1112         if (multi && ids[idx]) { /* still some values to map */
1113                 goto again;
1114         }
1115
1116         /*
1117          *  try to create new mappings for unmapped sids
1118          */
1119         for (i = 0; ids[i]; i++) {
1120                 if (ids[i]->status != ID_MAPPED) {
1121                         ids[i]->status = ID_UNMAPPED;
1122                         if (ids[i]->sid != NULL) {
1123                                 ret = idmap_ldap_new_mapping(dom, ids[i]);
1124                                 if (!NT_STATUS_IS_OK(ret)) {
1125                                         goto done;
1126                                 }
1127                         }
1128                 }
1129         }
1130
1131         ret = NT_STATUS_OK;
1132
1133 done:
1134         talloc_free(memctx);
1135         return ret;
1136 }
1137
1138 /**********************************
1139  Close the idmap ldap instance
1140 **********************************/
1141
1142 static struct idmap_methods idmap_ldap_methods = {
1143
1144         .init = idmap_ldap_db_init,
1145         .unixids_to_sids = idmap_ldap_unixids_to_sids,
1146         .sids_to_unixids = idmap_ldap_sids_to_unixids,
1147         .allocate_id = idmap_ldap_allocate_id,
1148 };
1149
1150 NTSTATUS idmap_ldap_init(void);
1151 NTSTATUS idmap_ldap_init(void)
1152 {
1153         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "ldap",
1154                                   &idmap_ldap_methods);
1155 }
1156