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(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_get_new_id(struct idmap_domain *dom,
 395                                       struct unixid *id)
 396 {
 397         NTSTATUS ret;
 398
 399         if (!strequal(dom->name, "*")) {
 400                 DEBUG(3, ("idmap_ldap_get_new_id: "
 401                           "Refusing allocation of a new unixid for domain'%s'. "
 402                           "Currently 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(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                                    const char *params)
 436 {
 437         NTSTATUS ret;
 438         struct idmap_ldap_context *ctx = NULL;
 439         char *config_option = NULL;
 440         const char *tmp = NULL;
 441
 442         /* Only do init if we are online */
 443         if (idmap_is_offline()) {
 444                 return NT_STATUS_FILE_IS_OFFLINE;
 445         }
 446
 447         ctx = TALLOC_ZERO_P(dom, struct idmap_ldap_context);
 448         if ( ! ctx) {
 449                 DEBUG(0, ("Out of memory!\n"));
 450                 return NT_STATUS_NO_MEMORY;
 451         }
 452
 453         if (strequal(dom->name, "*")) {
 454                 /* more specific configuration can go here */
 455         } else {
 456                 config_option = talloc_asprintf(ctx, "idmap config %s", dom->name);
 457                 if ( ! config_option) {
 458                         DEBUG(0, ("Out of memory!\n"));
 459                         ret = NT_STATUS_NO_MEMORY;
 460                         goto done;
 461                 }
 462         }
 463
 464         if (params != NULL) {
 465                 /* assume location is the only parameter */
 466                 ctx->url = talloc_strdup(ctx, params);
 467         } else {
 468                 tmp = lp_parm_const_string(-1, config_option, "ldap_url", NULL);
 469
 470                 if ( ! tmp) {
 471                         DEBUG(1, ("ERROR: missing idmap ldap url\n"));
 472                         ret = NT_STATUS_UNSUCCESSFUL;
 473                         goto done;
 474                 }
 475
 476                 ctx->url = talloc_strdup(ctx, tmp);
 477         }
 478         CHECK_ALLOC_DONE(ctx->url);
 479
 480         trim_char(ctx->url, '\"', '\"');
 481
 482         tmp = lp_parm_const_string(-1, config_option, "ldap_base_dn", NULL);
 483         if ( ! tmp || ! *tmp) {
 484                 tmp = lp_ldap_idmap_suffix();
 485                 if ( ! tmp) {
 486                         DEBUG(1, ("ERROR: missing idmap ldap suffix\n"));
 487                         ret = NT_STATUS_UNSUCCESSFUL;
 488                         goto done;
 489                 }
 490         }
 491
 492         ctx->suffix = talloc_strdup(ctx, tmp);
 493         CHECK_ALLOC_DONE(ctx->suffix);
 494
 495         ctx->rw_ops = talloc_zero(ctx, struct idmap_rw_ops);
 496         CHECK_ALLOC_DONE(ctx->rw_ops);
 497
 498         ctx->rw_ops->get_new_id = idmap_ldap_get_new_id;
 499         ctx->rw_ops->set_mapping = idmap_ldap_set_mapping;
 500
 501         ret = smbldap_init(ctx, winbind_event_context(), ctx->url,
 502                            &ctx->smbldap_state);
 503         if (!NT_STATUS_IS_OK(ret)) {
 504                 DEBUG(1, ("ERROR: smbldap_init (%s) failed!\n", ctx->url));
 505                 goto done;
 506         }
 507
 508         ret = get_credentials( ctx, ctx->smbldap_state, config_option,
 509                                dom, &ctx->user_dn );
 510         if ( !NT_STATUS_IS_OK(ret) ) {
 511                 DEBUG(1,("idmap_ldap_db_init: Failed to get connection "
 512                          "credentials (%s)\n", nt_errstr(ret)));
 513                 goto done;
 514         }
 515
 516         /* set the destructor on the context, so that resource are properly
 517            freed if the contexts is released */
 518
 519         talloc_set_destructor(ctx, idmap_ldap_close_destructor);
 520
 521         dom->private_data = ctx;
 522
 523         ret = verify_idpool(dom);
 524         if (!NT_STATUS_IS_OK(ret)) {
 525                 DEBUG(1, ("idmap_ldap_db_init: failed to verify ID pool (%s)\n",
 526                          nt_errstr(ret)));
 527                 goto done;
 528         }
 529
 530         talloc_free(config_option);
 531         return NT_STATUS_OK;
 532
 533 /*failed */
 534 done:
 535         talloc_free(ctx);
 536         return ret;
 537 }
 538
 539 /**
 540  * set a mapping.
 541  */
 542
 543 /* TODO: change this:  This function cannot be called to modify a mapping,
 544  * only set a new one */
 545
 546 static NTSTATUS idmap_ldap_set_mapping(struct idmap_domain *dom,
 547                                        const struct id_map *map)
 548 {
 549         NTSTATUS ret;
 550         TALLOC_CTX *memctx;
 551         struct idmap_ldap_context *ctx;
 552         LDAPMessage *entry = NULL;
 553         LDAPMod **mods = NULL;
 554         const char *type;
 555         char *id_str;
 556         char *sid;
 557         char *dn;
 558         int rc = -1;
 559
 560         /* Only do query if we are online */
 561         if (idmap_is_offline()) {
 562                 return NT_STATUS_FILE_IS_OFFLINE;
 563         }
 564
 565         ctx = talloc_get_type(dom->private_data, struct idmap_ldap_context);
 566
 567         switch(map->xid.type) {
 568         case ID_TYPE_UID:
 569                 type = get_attr_key2string(sidmap_attr_list,
 570                                            LDAP_ATTR_UIDNUMBER);
 571                 break;
 572
 573         case ID_TYPE_GID:
 574                 type = get_attr_key2string(sidmap_attr_list,
 575                                            LDAP_ATTR_GIDNUMBER);
 576                 break;
 577
 578         default:
 579                 return NT_STATUS_INVALID_PARAMETER;
 580         }
 581
 582         memctx = talloc_new(ctx);
 583         if ( ! memctx) {
 584                 DEBUG(0, ("Out of memory!\n"));
 585                 return NT_STATUS_NO_MEMORY;
 586         }
 587
 588         id_str = talloc_asprintf(memctx, "%lu", (unsigned long)map->xid.id);
 589         CHECK_ALLOC_DONE(id_str);
 590
 591         sid = talloc_strdup(memctx, sid_string_talloc(memctx, map->sid));
 592         CHECK_ALLOC_DONE(sid);
 593
 594         dn = talloc_asprintf(memctx, "%s=%s,%s",
 595                         get_attr_key2string(sidmap_attr_list, LDAP_ATTR_SID),
 596                         sid,
 597                         ctx->suffix);
 598         CHECK_ALLOC_DONE(dn);
 599
 600         smbldap_set_mod(&mods, LDAP_MOD_ADD,
 601                         "objectClass", LDAP_OBJ_IDMAP_ENTRY);
 602
 603         smbldap_make_mod(ctx->smbldap_state->ldap_struct,
 604                          entry, &mods, type, id_str);
 605
 606         smbldap_make_mod(ctx->smbldap_state->ldap_struct, entry, &mods,
 607                          get_attr_key2string(sidmap_attr_list, LDAP_ATTR_SID),
 608                          sid);
 609
 610         if ( ! mods) {
 611                 DEBUG(2, ("ERROR: No mods?\n"));
 612                 ret = NT_STATUS_UNSUCCESSFUL;
 613                 goto done;
 614         }
 615
 616         /* TODO: remove conflicting mappings! */
 617
 618         smbldap_set_mod(&mods, LDAP_MOD_ADD, "objectClass", LDAP_OBJ_SID_ENTRY);
 619
 620         DEBUG(10, ("Set DN %s (%s -> %s)\n", dn, sid, id_str));
 621
 622         rc = smbldap_add(ctx->smbldap_state, dn, mods);
 623         ldap_mods_free(mods, True);
 624
 625         if (rc != LDAP_SUCCESS) {
 626                 char *ld_error = NULL;
 627                 ldap_get_option(ctx->smbldap_state->ldap_struct,
 628                                 LDAP_OPT_ERROR_STRING, &ld_error);
 629                 DEBUG(0,("ldap_set_mapping_internals: Failed to add %s to %lu "
 630                          "mapping [%s]\n", sid,
 631                          (unsigned long)map->xid.id, type));
 632                 DEBUG(0, ("ldap_set_mapping_internals: Error was: %s (%s)\n",
 633                         ld_error ? ld_error : "(NULL)", ldap_err2string (rc)));
 634                 if (ld_error) {
 635                         ldap_memfree(ld_error);
 636                 }
 637                 ret = NT_STATUS_UNSUCCESSFUL;
 638                 goto done;
 639         }
 640
 641         DEBUG(10,("ldap_set_mapping: Successfully created mapping from %s to "
 642                   "%lu [%s]\n", sid, (unsigned long)map->xid.id, type));
 643
 644         ret = NT_STATUS_OK;
 645
 646 done:
 647         talloc_free(memctx);
 648         return ret;
 649 }
 650
 651 /**
 652  * Create a new mapping for an unmapped SID, also allocating a new ID.
 653  * If possible, this should be run inside a transaction to make the
 654  * action atomic.
 655  */
 656 static NTSTATUS idmap_ldap_new_mapping(struct idmap_domain *dom, struct id_map *map)
 657 {
 658         NTSTATUS ret;
 659         struct idmap_ldap_context *ctx;
 660
 661         ctx = talloc_get_type(dom->private_data, struct idmap_ldap_context);
 662
 663         ret = idmap_rw_new_mapping(dom, ctx->rw_ops, map);
 664
 665         return ret;
 666 }
 667
 668
 669 /* max number of ids requested per batch query */
 670 #define IDMAP_LDAP_MAX_IDS 30
 671
 672 /**********************************
 673  lookup a set of unix ids.
 674 **********************************/
 675
 676 /* this function searches up to IDMAP_LDAP_MAX_IDS entries
 677  * in maps for a match */
 678 static struct id_map *find_map_by_id(struct id_map **maps,
 679                                      enum id_type type,
 680                                      uint32_t id)
 681 {
 682         int i;
 683
 684         for (i = 0; i < IDMAP_LDAP_MAX_IDS; i++) {
 685                 if (maps[i] == NULL) { /* end of the run */
 686                         return NULL;
 687                 }
 688                 if ((maps[i]->xid.type == type) && (maps[i]->xid.id == id)) {
 689                         return maps[i];
 690                 }
 691         }
 692
 693         return NULL;
 694 }
 695
 696 static NTSTATUS idmap_ldap_unixids_to_sids(struct idmap_domain *dom,
 697                                            struct id_map **ids)
 698 {
 699         NTSTATUS ret;
 700         TALLOC_CTX *memctx;
 701         struct idmap_ldap_context *ctx;
 702         LDAPMessage *result = NULL;
 703         LDAPMessage *entry = NULL;
 704         const char *uidNumber;
 705         const char *gidNumber;
 706         const char **attr_list;
 707         char *filter = NULL;
 708         bool multi = False;
 709         int idx = 0;
 710         int bidx = 0;
 711         int count;
 712         int rc;
 713         int i;
 714
 715         /* Only do query if we are online */
 716         if (idmap_is_offline()) {
 717                 return NT_STATUS_FILE_IS_OFFLINE;
 718         }
 719
 720         ctx = talloc_get_type(dom->private_data, struct idmap_ldap_context);
 721
 722         memctx = talloc_new(ctx);
 723         if ( ! memctx) {
 724                 DEBUG(0, ("Out of memory!\n"));
 725                 return NT_STATUS_NO_MEMORY;
 726         }
 727
 728         uidNumber = get_attr_key2string(idpool_attr_list, LDAP_ATTR_UIDNUMBER);
 729         gidNumber = get_attr_key2string(idpool_attr_list, LDAP_ATTR_GIDNUMBER);
 730
 731         attr_list = get_attr_list(memctx, sidmap_attr_list);
 732
 733         if ( ! ids[1]) {
 734                 /* if we are requested just one mapping use the simple filter */
 735
 736                 filter = talloc_asprintf(memctx, "(&(objectClass=%s)(%s=%lu))",
 737                                 LDAP_OBJ_IDMAP_ENTRY,
 738                                 (ids[0]->xid.type==ID_TYPE_UID)?uidNumber:gidNumber,
 739                                 (unsigned long)ids[0]->xid.id);
 740                 CHECK_ALLOC_DONE(filter);
 741                 DEBUG(10, ("Filter: [%s]\n", filter));
 742         } else {
 743                 /* multiple mappings */
 744                 multi = True;
 745         }
 746
 747         for (i = 0; ids[i]; i++) {
 748                 ids[i]->status = ID_UNKNOWN;
 749         }
 750
 751 again:
 752         if (multi) {
 753
 754                 talloc_free(filter);
 755                 filter = talloc_asprintf(memctx,
 756                                          "(&(objectClass=%s)(|",
 757                                          LDAP_OBJ_IDMAP_ENTRY);
 758                 CHECK_ALLOC_DONE(filter);
 759
 760                 bidx = idx;
 761                 for (i = 0; (i < IDMAP_LDAP_MAX_IDS) && ids[idx]; i++, idx++) {
 762                         filter = talloc_asprintf_append_buffer(filter, "(%s=%lu)",
 763                                         (ids[idx]->xid.type==ID_TYPE_UID)?uidNumber:gidNumber,
 764                                         (unsigned long)ids[idx]->xid.id);
 765                         CHECK_ALLOC_DONE(filter);
 766                 }
 767                 filter = talloc_asprintf_append_buffer(filter, "))");
 768                 CHECK_ALLOC_DONE(filter);
 769                 DEBUG(10, ("Filter: [%s]\n", filter));
 770         } else {
 771                 bidx = 0;
 772                 idx = 1;
 773         }
 774
 775         rc = smbldap_search(ctx->smbldap_state, ctx->suffix, LDAP_SCOPE_SUBTREE,
 776                 filter, attr_list, 0, &result);
 777
 778         if (rc != LDAP_SUCCESS) {
 779                 DEBUG(3,("Failure looking up ids (%s)\n", ldap_err2string(rc)));
 780                 ret = NT_STATUS_UNSUCCESSFUL;
 781                 goto done;
 782         }
 783
 784         count = ldap_count_entries(ctx->smbldap_state->ldap_struct, result);
 785
 786         if (count == 0) {
 787                 DEBUG(10, ("NO SIDs found\n"));
 788         }
 789
 790         for (i = 0; i < count; i++) {
 791                 char *sidstr = NULL;
 792                 char *tmp = NULL;
 793                 enum id_type type;
 794                 struct id_map *map;
 795                 uint32_t id;
 796
 797                 if (i == 0) { /* first entry */
 798                         entry = ldap_first_entry(ctx->smbldap_state->ldap_struct,
 799                                                  result);
 800                 } else { /* following ones */
 801                         entry = ldap_next_entry(ctx->smbldap_state->ldap_struct,
 802                                                 entry);
 803                 }
 804                 if ( ! entry) {
 805                         DEBUG(2, ("ERROR: Unable to fetch ldap entries "
 806                                   "from results\n"));
 807                         break;
 808                 }
 809
 810                 /* first check if the SID is present */
 811                 sidstr = smbldap_talloc_single_attribute(
 812                                 ctx->smbldap_state->ldap_struct,
 813                                 entry, LDAP_ATTRIBUTE_SID, memctx);
 814                 if ( ! sidstr) { /* no sid, skip entry */
 815                         DEBUG(2, ("WARNING SID not found on entry\n"));
 816                         continue;
 817                 }
 818
 819                 /* now try to see if it is a uid, if not try with a gid
 820                  * (gid is more common, but in case both uidNumber and
 821                  * gidNumber are returned the SID is mapped to the uid
 822                  *not the gid) */
 823                 type = ID_TYPE_UID;
 824                 tmp = smbldap_talloc_single_attribute(
 825                                 ctx->smbldap_state->ldap_struct,
 826                                 entry, uidNumber, memctx);
 827                 if ( ! tmp) {
 828                         type = ID_TYPE_GID;
 829                         tmp = smbldap_talloc_single_attribute(
 830                                         ctx->smbldap_state->ldap_struct,
 831                                         entry, gidNumber, memctx);
 832                 }
 833                 if ( ! tmp) { /* wow very strange entry, how did it match ? */
 834                         DEBUG(5, ("Unprobable match on (%s), no uidNumber, "
 835                                   "nor gidNumber returned\n", sidstr));
 836                         TALLOC_FREE(sidstr);
 837                         continue;
 838                 }
 839
 840                 id = strtoul(tmp, NULL, 10);
 841                 if (!idmap_unix_id_is_in_range(id, dom)) {
 842                         DEBUG(5, ("Requested id (%u) out of range (%u - %u). "
 843                                   "Filtered!\n", id,
 844                                   dom->low_id, dom->high_id));
 845                         TALLOC_FREE(sidstr);
 846                         TALLOC_FREE(tmp);
 847                         continue;
 848                 }
 849                 TALLOC_FREE(tmp);
 850
 851                 map = find_map_by_id(&ids[bidx], type, id);
 852                 if (!map) {
 853                         DEBUG(2, ("WARNING: couldn't match sid (%s) "
 854                                   "with requested ids\n", sidstr));
 855                         TALLOC_FREE(sidstr);
 856                         continue;
 857                 }
 858
 859                 if ( ! string_to_sid(map->sid, sidstr)) {
 860                         DEBUG(2, ("ERROR: Invalid SID on entry\n"));
 861                         TALLOC_FREE(sidstr);
 862                         continue;
 863                 }
 864
 865                 if (map->status == ID_MAPPED) {
 866                         DEBUG(1, ("WARNING: duplicate %s mapping in LDAP. "
 867                               "overwriting mapping %u -> %s with %u -> %s\n",
 868                               (type == ID_TYPE_UID) ? "UID" : "GID",
 869                               id, sid_string_dbg(map->sid), id, sidstr));
 870                 }
 871
 872                 TALLOC_FREE(sidstr);
 873
 874                 /* mapped */
 875                 map->status = ID_MAPPED;
 876
 877                 DEBUG(10, ("Mapped %s -> %lu (%d)\n", sid_string_dbg(map->sid),
 878                            (unsigned long)map->xid.id, map->xid.type));
 879         }
 880
 881         /* free the ldap results */
 882         if (result) {
 883                 ldap_msgfree(result);
 884                 result = NULL;
 885         }
 886
 887         if (multi && ids[idx]) { /* still some values to map */
 888                 goto again;
 889         }
 890
 891         ret = NT_STATUS_OK;
 892
 893         /* mark all unknwon/expired ones as unmapped */
 894         for (i = 0; ids[i]; i++) {
 895                 if (ids[i]->status != ID_MAPPED)
 896                         ids[i]->status = ID_UNMAPPED;
 897         }
 898
 899 done:
 900         talloc_free(memctx);
 901         return ret;
 902 }
 903
 904 /**********************************
 905  lookup a set of sids.
 906 **********************************/
 907
 908 /* this function searches up to IDMAP_LDAP_MAX_IDS entries
 909  * in maps for a match */
 910 static struct id_map *find_map_by_sid(struct id_map **maps, struct dom_sid *sid)
 911 {
 912         int i;
 913
 914         for (i = 0; i < IDMAP_LDAP_MAX_IDS; i++) {
 915                 if (maps[i] == NULL) { /* end of the run */
 916                         return NULL;
 917                 }
 918                 if (dom_sid_equal(maps[i]->sid, sid)) {
 919                         return maps[i];
 920                 }
 921         }
 922
 923         return NULL;
 924 }
 925
 926 static NTSTATUS idmap_ldap_sids_to_unixids(struct idmap_domain *dom,
 927                                            struct id_map **ids)
 928 {
 929         LDAPMessage *entry = NULL;
 930         NTSTATUS ret;
 931         TALLOC_CTX *memctx;
 932         struct idmap_ldap_context *ctx;
 933         LDAPMessage *result = NULL;
 934         const char *uidNumber;
 935         const char *gidNumber;
 936         const char **attr_list;
 937         char *filter = NULL;
 938         bool multi = False;
 939         int idx = 0;
 940         int bidx = 0;
 941         int count;
 942         int rc;
 943         int i;
 944
 945         /* Only do query if we are online */
 946         if (idmap_is_offline()) {
 947                 return NT_STATUS_FILE_IS_OFFLINE;
 948         }
 949
 950         ctx = talloc_get_type(dom->private_data, struct idmap_ldap_context);
 951
 952         memctx = talloc_new(ctx);
 953         if ( ! memctx) {
 954                 DEBUG(0, ("Out of memory!\n"));
 955                 return NT_STATUS_NO_MEMORY;
 956         }
 957
 958         uidNumber = get_attr_key2string(idpool_attr_list, LDAP_ATTR_UIDNUMBER);
 959         gidNumber = get_attr_key2string(idpool_attr_list, LDAP_ATTR_GIDNUMBER);
 960
 961         attr_list = get_attr_list(memctx, sidmap_attr_list);
 962
 963         if ( ! ids[1]) {
 964                 /* if we are requested just one mapping use the simple filter */
 965
 966                 filter = talloc_asprintf(memctx, "(&(objectClass=%s)(%s=%s))",
 967                                 LDAP_OBJ_IDMAP_ENTRY,
 968                                 LDAP_ATTRIBUTE_SID,
 969                                 sid_string_talloc(memctx, ids[0]->sid));
 970                 CHECK_ALLOC_DONE(filter);
 971                 DEBUG(10, ("Filter: [%s]\n", filter));
 972         } else {
 973                 /* multiple mappings */
 974                 multi = True;
 975         }
 976
 977         for (i = 0; ids[i]; i++) {
 978                 ids[i]->status = ID_UNKNOWN;
 979         }
 980
 981 again:
 982         if (multi) {
 983
 984                 TALLOC_FREE(filter);
 985                 filter = talloc_asprintf(memctx,
 986                                          "(&(objectClass=%s)(|",
 987                                          LDAP_OBJ_IDMAP_ENTRY);
 988                 CHECK_ALLOC_DONE(filter);
 989
 990                 bidx = idx;
 991                 for (i = 0; (i < IDMAP_LDAP_MAX_IDS) && ids[idx]; i++, idx++) {
 992                         filter = talloc_asprintf_append_buffer(filter, "(%s=%s)",
 993                                         LDAP_ATTRIBUTE_SID,
 994                                         sid_string_talloc(memctx,
 995                                                           ids[idx]->sid));
 996                         CHECK_ALLOC_DONE(filter);
 997                 }
 998                 filter = talloc_asprintf_append_buffer(filter, "))");
 999                 CHECK_ALLOC_DONE(filter);
1000                 DEBUG(10, ("Filter: [%s]", filter));
1001         } else {
1002                 bidx = 0;
1003                 idx = 1;
1004         }
1005
1006         rc = smbldap_search(ctx->smbldap_state, ctx->suffix, LDAP_SCOPE_SUBTREE,
1007                 filter, attr_list, 0, &result);
1008
1009         if (rc != LDAP_SUCCESS) {
1010                 DEBUG(3,("Failure looking up sids (%s)\n",
1011                          ldap_err2string(rc)));
1012                 ret = NT_STATUS_UNSUCCESSFUL;
1013                 goto done;
1014         }
1015
1016         count = ldap_count_entries(ctx->smbldap_state->ldap_struct, result);
1017
1018         if (count == 0) {
1019                 DEBUG(10, ("NO SIDs found\n"));
1020         }
1021
1022         for (i = 0; i < count; i++) {
1023                 char *sidstr = NULL;
1024                 char *tmp = NULL;
1025                 enum id_type type;
1026                 struct id_map *map;
1027                 struct dom_sid sid;
1028                 uint32_t id;
1029
1030                 if (i == 0) { /* first entry */
1031                         entry = ldap_first_entry(ctx->smbldap_state->ldap_struct,
1032                                                  result);
1033                 } else { /* following ones */
1034                         entry = ldap_next_entry(ctx->smbldap_state->ldap_struct,
1035                                                 entry);
1036                 }
1037                 if ( ! entry) {
1038                         DEBUG(2, ("ERROR: Unable to fetch ldap entries "
1039                                   "from results\n"));
1040                         break;
1041                 }
1042
1043                 /* first check if the SID is present */
1044                 sidstr = smbldap_talloc_single_attribute(
1045                                 ctx->smbldap_state->ldap_struct,
1046                                 entry, LDAP_ATTRIBUTE_SID, memctx);
1047                 if ( ! sidstr) { /* no sid ??, skip entry */
1048                         DEBUG(2, ("WARNING SID not found on entry\n"));
1049                         continue;
1050                 }
1051
1052                 if ( ! string_to_sid(&sid, sidstr)) {
1053                         DEBUG(2, ("ERROR: Invalid SID on entry\n"));
1054                         TALLOC_FREE(sidstr);
1055                         continue;
1056                 }
1057
1058                 map = find_map_by_sid(&ids[bidx], &sid);
1059                 if (!map) {
1060                         DEBUG(2, ("WARNING: couldn't find entry sid (%s) "
1061                                   "in ids", sidstr));
1062                         TALLOC_FREE(sidstr);
1063                         continue;
1064                 }
1065
1066                 /* now try to see if it is a uid, if not try with a gid
1067                  * (gid is more common, but in case both uidNumber and
1068                  * gidNumber are returned the SID is mapped to the uid
1069                  * not the gid) */
1070                 type = ID_TYPE_UID;
1071                 tmp = smbldap_talloc_single_attribute(
1072                                 ctx->smbldap_state->ldap_struct,
1073                                 entry, uidNumber, memctx);
1074                 if ( ! tmp) {
1075                         type = ID_TYPE_GID;
1076                         tmp = smbldap_talloc_single_attribute(
1077                                         ctx->smbldap_state->ldap_struct,
1078                                         entry, gidNumber, memctx);
1079                 }
1080                 if ( ! tmp) { /* no ids ?? */
1081                         DEBUG(5, ("no uidNumber, "
1082                                   "nor gidNumber attributes found\n"));
1083                         TALLOC_FREE(sidstr);
1084                         continue;
1085                 }
1086
1087                 id = strtoul(tmp, NULL, 10);
1088                 if (!idmap_unix_id_is_in_range(id, dom)) {
1089                         DEBUG(5, ("Requested id (%u) out of range (%u - %u). "
1090                                   "Filtered!\n", id,
1091                                   dom->low_id, dom->high_id));
1092                         TALLOC_FREE(sidstr);
1093                         TALLOC_FREE(tmp);
1094                         continue;
1095                 }
1096                 TALLOC_FREE(tmp);
1097
1098                 if (map->status == ID_MAPPED) {
1099                         DEBUG(1, ("WARNING: duplicate %s mapping in LDAP. "
1100                               "overwriting mapping %s -> %u with %s -> %u\n",
1101                               (type == ID_TYPE_UID) ? "UID" : "GID",
1102                               sidstr, map->xid.id, sidstr, id));
1103                 }
1104
1105                 TALLOC_FREE(sidstr);
1106
1107                 /* mapped */
1108                 map->xid.type = type;
1109                 map->xid.id = id;
1110                 map->status = ID_MAPPED;
1111
1112                 DEBUG(10, ("Mapped %s -> %lu (%d)\n", sid_string_dbg(map->sid),
1113                            (unsigned long)map->xid.id, map->xid.type));
1114         }
1115
1116         /* free the ldap results */
1117         if (result) {
1118                 ldap_msgfree(result);
1119                 result = NULL;
1120         }
1121
1122         if (multi && ids[idx]) { /* still some values to map */
1123                 goto again;
1124         }
1125
1126         /*
1127          *  try to create new mappings for unmapped sids
1128          */
1129         for (i = 0; ids[i]; i++) {
1130                 if (ids[i]->status != ID_MAPPED) {
1131                         ids[i]->status = ID_UNMAPPED;
1132                         if (ids[i]->sid != NULL) {
1133                                 ret = idmap_ldap_new_mapping(dom, ids[i]);
1134                                 if (!NT_STATUS_IS_OK(ret)) {
1135                                         goto done;
1136                                 }
1137                         }
1138                 }
1139         }
1140
1141         ret = NT_STATUS_OK;
1142
1143 done:
1144         talloc_free(memctx);
1145         return ret;
1146 }
1147
1148 /**********************************
1149  Close the idmap ldap instance
1150 **********************************/
1151
1152 static struct idmap_methods idmap_ldap_methods = {
1153
1154         .init = idmap_ldap_db_init,
1155         .unixids_to_sids = idmap_ldap_unixids_to_sids,
1156         .sids_to_unixids = idmap_ldap_sids_to_unixids,
1157         .allocate_id = idmap_ldap_get_new_id,
1158 };
1159
1160 NTSTATUS idmap_ldap_init(void);
1161 NTSTATUS idmap_ldap_init(void)
1162 {
1163         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "ldap",
1164                                   &idmap_ldap_methods);
1165 }
1166