source3/winbindd/idmap_ad.c

   1 /*
   2  *  idmap_ad: map between Active Directory and RFC 2307 or "Services for Unix" (SFU) Accounts
   3  *
   4  * Unix SMB/CIFS implementation.
   5  *
   6  * Winbind ADS backend functions
   7  *
   8  * Copyright (C) Andrew Tridgell 2001
   9  * Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003
  10  * Copyright (C) Gerald (Jerry) Carter 2004-2007
  11  * Copyright (C) Luke Howard 2001-2004
  12  * Copyright (C) Michael Adam 2008,2010
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 3 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  26  */
  27
  28 #include "includes.h"
  29 #include "winbindd.h"
  30 #include "../libds/common/flags.h"
  31 #include "ads.h"
  32 #include "libads/ldap_schema.h"
  33 #include "nss_info.h"
  34 #include "idmap.h"
  35 #include "../libcli/ldap/ldap_ndr.h"
  36 #include "../libcli/security/security.h"
  37
  38 #undef DBGC_CLASS
  39 #define DBGC_CLASS DBGC_IDMAP
  40
  41 #define CHECK_ALLOC_DONE(mem) do { \
  42      if (!mem) { \
  43            DEBUG(0, ("Out of memory!\n")); \
  44            ret = NT_STATUS_NO_MEMORY; \
  45            goto done; \
  46       } \
  47 } while (0)
  48
  49 struct idmap_ad_context {
  50         ADS_STRUCT *ads;
  51         struct posix_schema *ad_schema;
  52         enum wb_posix_mapping ad_map_type; /* WB_POSIX_MAP_UNKNOWN */
  53 };
  54
  55 /************************************************************************
  56  ***********************************************************************/
  57
  58 static ADS_STATUS ad_idmap_cached_connection(struct idmap_domain *dom)
  59 {
  60         ADS_STATUS status;
  61         struct idmap_ad_context * ctx;
  62
  63         DEBUG(10, ("ad_idmap_cached_connection: called for domain '%s'\n",
  64                    dom->name));
  65
  66         ctx = talloc_get_type(dom->private_data, struct idmap_ad_context);
  67
  68         status = ads_idmap_cached_connection(&ctx->ads, dom->name);
  69         if (!ADS_ERR_OK(status)) {
  70                 return status;
  71         }
  72
  73         ctx = talloc_get_type(dom->private_data, struct idmap_ad_context);
  74
  75         /* if we have a valid ADS_STRUCT and the schema model is
  76            defined, then we can return here. */
  77
  78         if ( ctx->ad_schema ) {
  79                 return ADS_SUCCESS;
  80         }
  81
  82         /* Otherwise, set the schema model */
  83
  84         if ( (ctx->ad_map_type ==  WB_POSIX_MAP_SFU) ||
  85              (ctx->ad_map_type ==  WB_POSIX_MAP_SFU20) ||
  86              (ctx->ad_map_type ==  WB_POSIX_MAP_RFC2307) )
  87         {
  88                 status = ads_check_posix_schema_mapping(
  89                         ctx, ctx->ads, ctx->ad_map_type, &ctx->ad_schema);
  90                 if ( !ADS_ERR_OK(status) ) {
  91                         DEBUG(2,("ad_idmap_cached_connection: Failed to obtain schema details!\n"));
  92                 }
  93         }
  94
  95         return status;
  96 }
  97
  98 static int idmap_ad_context_destructor(struct idmap_ad_context *ctx)
  99 {
 100         if (ctx->ads != NULL) {
 101                 /* we own this ADS_STRUCT so make sure it goes away */
 102                 ctx->ads->is_mine = True;
 103                 ads_destroy( &ctx->ads );
 104                 ctx->ads = NULL;
 105         }
 106         return 0;
 107 }
 108
 109 /************************************************************************
 110  ***********************************************************************/
 111
 112 static NTSTATUS idmap_ad_initialize(struct idmap_domain *dom)
 113 {
 114         struct idmap_ad_context *ctx;
 115         char *config_option;
 116         const char *schema_mode = NULL;
 117
 118         ctx = talloc_zero(dom, struct idmap_ad_context);
 119         if (ctx == NULL) {
 120                 DEBUG(0, ("Out of memory!\n"));
 121                 return NT_STATUS_NO_MEMORY;
 122         }
 123         talloc_set_destructor(ctx, idmap_ad_context_destructor);
 124
 125         config_option = talloc_asprintf(ctx, "idmap config %s", dom->name);
 126         if (config_option == NULL) {
 127                 DEBUG(0, ("Out of memory!\n"));
 128                 talloc_free(ctx);
 129                 return NT_STATUS_NO_MEMORY;
 130         }
 131
 132         /* default map type */
 133         ctx->ad_map_type = WB_POSIX_MAP_RFC2307;
 134
 135         /* schema mode */
 136         schema_mode = lp_parm_const_string(-1, config_option, "schema_mode", NULL);
 137         if ( schema_mode && schema_mode[0] ) {
 138                 if ( strequal(schema_mode, "sfu") )
 139                         ctx->ad_map_type = WB_POSIX_MAP_SFU;
 140                 else if ( strequal(schema_mode, "sfu20" ) )
 141                         ctx->ad_map_type = WB_POSIX_MAP_SFU20;
 142                 else if ( strequal(schema_mode, "rfc2307" ) )
 143                         ctx->ad_map_type = WB_POSIX_MAP_RFC2307;
 144                 else
 145                         DEBUG(0,("idmap_ad_initialize: Unknown schema_mode (%s)\n",
 146                                  schema_mode));
 147         }
 148
 149         dom->private_data = ctx;
 150
 151         talloc_free(config_option);
 152
 153         return NT_STATUS_OK;
 154 }
 155
 156 /************************************************************************
 157  ***********************************************************************/
 158
 159 static NTSTATUS idmap_ad_unixids_to_sids(struct idmap_domain *dom, struct id_map **ids)
 160 {
 161         NTSTATUS ret;
 162         TALLOC_CTX *memctx;
 163         struct idmap_ad_context *ctx;
 164         ADS_STATUS rc;
 165         const char *attrs[] = { "sAMAccountType",
 166                                 "objectSid",
 167                                 NULL, /* uidnumber */
 168                                 NULL, /* gidnumber */
 169                                 NULL };
 170         LDAPMessage *res = NULL;
 171         LDAPMessage *entry = NULL;
 172         char *filter = NULL;
 173         int idx = 0;
 174         int bidx = 0;
 175         int count;
 176         int i;
 177         char *u_filter = NULL;
 178         char *g_filter = NULL;
 179
 180         /* initialize the status to avoid suprise */
 181         for (i = 0; ids[i]; i++) {
 182                 ids[i]->status = ID_UNKNOWN;
 183         }
 184
 185         /* Only do query if we are online */
 186         if (idmap_is_offline()) {
 187                 return NT_STATUS_FILE_IS_OFFLINE;
 188         }
 189
 190         ctx = talloc_get_type(dom->private_data, struct idmap_ad_context);
 191
 192         if ( (memctx = talloc_new(ctx)) == NULL ) {
 193                 DEBUG(0, ("Out of memory!\n"));
 194                 return NT_STATUS_NO_MEMORY;
 195         }
 196
 197         rc = ad_idmap_cached_connection(dom);
 198         if (!ADS_ERR_OK(rc)) {
 199                 DEBUG(1, ("ADS uninitialized: %s\n", ads_errstr(rc)));
 200                 ret = NT_STATUS_UNSUCCESSFUL;
 201                 /* ret = ads_ntstatus(rc); */
 202                 goto done;
 203         }
 204
 205         attrs[2] = ctx->ad_schema->posix_uidnumber_attr;
 206         attrs[3] = ctx->ad_schema->posix_gidnumber_attr;
 207
 208 again:
 209         bidx = idx;
 210         for (i = 0; (i < IDMAP_LDAP_MAX_IDS) && ids[idx]; i++, idx++) {
 211                 switch (ids[idx]->xid.type) {
 212                 case ID_TYPE_UID:
 213                         if ( ! u_filter) {
 214                                 u_filter = talloc_asprintf(memctx, "(&(|"
 215                                                            "(sAMAccountType=%d)"
 216                                                            "(sAMAccountType=%d)"
 217                                                            "(sAMAccountType=%d))(|",
 218                                                            ATYPE_NORMAL_ACCOUNT,
 219                                                            ATYPE_WORKSTATION_TRUST,
 220                                                            ATYPE_INTERDOMAIN_TRUST);
 221                         }
 222                         u_filter = talloc_asprintf_append_buffer(u_filter, "(%s=%lu)",
 223                                                           ctx->ad_schema->posix_uidnumber_attr,
 224                                                           (unsigned long)ids[idx]->xid.id);
 225                         CHECK_ALLOC_DONE(u_filter);
 226                         break;
 227
 228                 case ID_TYPE_GID:
 229                         if ( ! g_filter) {
 230                                 g_filter = talloc_asprintf(memctx, "(&(|"
 231                                                            "(sAMAccountType=%d)"
 232                                                            "(sAMAccountType=%d))(|",
 233                                                            ATYPE_SECURITY_GLOBAL_GROUP,
 234                                                            ATYPE_SECURITY_LOCAL_GROUP);
 235                         }
 236                         g_filter = talloc_asprintf_append_buffer(g_filter, "(%s=%lu)",
 237                                                           ctx->ad_schema->posix_gidnumber_attr,
 238                                                           (unsigned long)ids[idx]->xid.id);
 239                         CHECK_ALLOC_DONE(g_filter);
 240                         break;
 241
 242                 default:
 243                         DEBUG(3, ("Error: mapping requested but Unknown ID type\n"));
 244                         ids[idx]->status = ID_UNKNOWN;
 245                         continue;
 246                 }
 247         }
 248         filter = talloc_asprintf(memctx, "(|");
 249         CHECK_ALLOC_DONE(filter);
 250         if ( u_filter) {
 251                 filter = talloc_asprintf_append_buffer(filter, "%s))", u_filter);
 252                 CHECK_ALLOC_DONE(filter);
 253                         TALLOC_FREE(u_filter);
 254         }
 255         if ( g_filter) {
 256                 filter = talloc_asprintf_append_buffer(filter, "%s))", g_filter);
 257                 CHECK_ALLOC_DONE(filter);
 258                 TALLOC_FREE(g_filter);
 259         }
 260         filter = talloc_asprintf_append_buffer(filter, ")");
 261         CHECK_ALLOC_DONE(filter);
 262
 263         rc = ads_search_retry(ctx->ads, &res, filter, attrs);
 264         if (!ADS_ERR_OK(rc)) {
 265                 DEBUG(1, ("ERROR: ads search returned: %s\n", ads_errstr(rc)));
 266                 ret = NT_STATUS_UNSUCCESSFUL;
 267                 goto done;
 268         }
 269
 270         if ( (count = ads_count_replies(ctx->ads, res)) == 0 ) {
 271                 DEBUG(10, ("No IDs found\n"));
 272         }
 273
 274         entry = res;
 275         for (i = 0; (i < count) && entry; i++) {
 276                 struct dom_sid sid;
 277                 enum id_type type;
 278                 struct id_map *map;
 279                 uint32_t id;
 280                 uint32_t atype;
 281
 282                 if (i == 0) { /* first entry */
 283                         entry = ads_first_entry(ctx->ads, entry);
 284                 } else { /* following ones */
 285                         entry = ads_next_entry(ctx->ads, entry);
 286                 }
 287
 288                 if ( !entry ) {
 289                         DEBUG(2, ("ERROR: Unable to fetch ldap entries from results\n"));
 290                         break;
 291                 }
 292
 293                 /* first check if the SID is present */
 294                 if (!ads_pull_sid(ctx->ads, entry, "objectSid", &sid)) {
 295                         DEBUG(2, ("Could not retrieve SID from entry\n"));
 296                         continue;
 297                 }
 298
 299                 /* get type */
 300                 if (!ads_pull_uint32(ctx->ads, entry, "sAMAccountType", &atype)) {
 301                         DEBUG(1, ("could not get SAM account type\n"));
 302                         continue;
 303                 }
 304
 305                 switch (atype & 0xF0000000) {
 306                 case ATYPE_SECURITY_GLOBAL_GROUP:
 307                 case ATYPE_SECURITY_LOCAL_GROUP:
 308                         type = ID_TYPE_GID;
 309                         break;
 310                 case ATYPE_NORMAL_ACCOUNT:
 311                 case ATYPE_WORKSTATION_TRUST:
 312                 case ATYPE_INTERDOMAIN_TRUST:
 313                         type = ID_TYPE_UID;
 314                         break;
 315                 default:
 316                         DEBUG(1, ("unrecognized SAM account type %08x\n", atype));
 317                         continue;
 318                 }
 319
 320                 if (!ads_pull_uint32(ctx->ads, entry, (type==ID_TYPE_UID) ?
 321                                                  ctx->ad_schema->posix_uidnumber_attr :
 322                                                  ctx->ad_schema->posix_gidnumber_attr,
 323                                      &id))
 324                 {
 325                         DEBUG(1, ("Could not get unix ID for SID %s\n",
 326                                   dom_sid_string(talloc_tos(), &sid)));
 327                         continue;
 328                 }
 329
 330                 if (!idmap_unix_id_is_in_range(id, dom)) {
 331                         DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 332                                 id, dom->low_id, dom->high_id));
 333                         continue;
 334                 }
 335
 336                 map = idmap_find_map_by_id(&ids[bidx], type, id);
 337                 if (!map) {
 338                         DEBUG(2, ("WARNING: couldn't match result with requested ID\n"));
 339                         continue;
 340                 }
 341
 342                 sid_copy(map->sid, &sid);
 343
 344                 /* mapped */
 345                 map->status = ID_MAPPED;
 346
 347                 DEBUG(10, ("Mapped %s -> %lu (%d)\n", sid_string_dbg(map->sid),
 348                            (unsigned long)map->xid.id,
 349                            map->xid.type));
 350         }
 351
 352         if (res) {
 353                 ads_msgfree(ctx->ads, res);
 354         }
 355
 356         if (ids[idx]) { /* still some values to map */
 357                 goto again;
 358         }
 359
 360         ret = NT_STATUS_OK;
 361
 362         /* mark all unknown/expired ones as unmapped */
 363         for (i = 0; ids[i]; i++) {
 364                 if (ids[i]->status != ID_MAPPED)
 365                         ids[i]->status = ID_UNMAPPED;
 366         }
 367
 368 done:
 369         talloc_free(memctx);
 370         return ret;
 371 }
 372
 373 /************************************************************************
 374  ***********************************************************************/
 375
 376 static NTSTATUS idmap_ad_sids_to_unixids(struct idmap_domain *dom, struct id_map **ids)
 377 {
 378         NTSTATUS ret;
 379         TALLOC_CTX *memctx;
 380         struct idmap_ad_context *ctx;
 381         ADS_STATUS rc;
 382         const char *attrs[] = { "sAMAccountType",
 383                                 "objectSid",
 384                                 NULL, /* attr_uidnumber */
 385                                 NULL, /* attr_gidnumber */
 386                                 NULL };
 387         LDAPMessage *res = NULL;
 388         LDAPMessage *entry = NULL;
 389         char *filter = NULL;
 390         int idx = 0;
 391         int bidx = 0;
 392         int count;
 393         int i;
 394         char *sidstr;
 395
 396         /* initialize the status to avoid suprise */
 397         for (i = 0; ids[i]; i++) {
 398                 ids[i]->status = ID_UNKNOWN;
 399         }
 400
 401         /* Only do query if we are online */
 402         if (idmap_is_offline()) {
 403                 return NT_STATUS_FILE_IS_OFFLINE;
 404         }
 405
 406         ctx = talloc_get_type(dom->private_data, struct idmap_ad_context);
 407
 408         if ( (memctx = talloc_new(ctx)) == NULL ) {
 409                 DEBUG(0, ("Out of memory!\n"));
 410                 return NT_STATUS_NO_MEMORY;
 411         }
 412
 413         rc = ad_idmap_cached_connection(dom);
 414         if (!ADS_ERR_OK(rc)) {
 415                 DEBUG(1, ("ADS uninitialized: %s\n", ads_errstr(rc)));
 416                 ret = NT_STATUS_UNSUCCESSFUL;
 417                 /* ret = ads_ntstatus(rc); */
 418                 goto done;
 419         }
 420
 421         if (ctx->ad_schema == NULL) {
 422                 DEBUG(0, ("haven't got ctx->ad_schema ! \n"));
 423                 ret = NT_STATUS_UNSUCCESSFUL;
 424                 goto done;
 425         }
 426
 427         attrs[2] = ctx->ad_schema->posix_uidnumber_attr;
 428         attrs[3] = ctx->ad_schema->posix_gidnumber_attr;
 429
 430 again:
 431         filter = talloc_asprintf(memctx, "(&(|"
 432                                  "(sAMAccountType=%d)(sAMAccountType=%d)(sAMAccountType=%d)" /* user account types */
 433                                  "(sAMAccountType=%d)(sAMAccountType=%d)" /* group account types */
 434                                  ")(|",
 435                                  ATYPE_NORMAL_ACCOUNT, ATYPE_WORKSTATION_TRUST, ATYPE_INTERDOMAIN_TRUST,
 436                                  ATYPE_SECURITY_GLOBAL_GROUP, ATYPE_SECURITY_LOCAL_GROUP);
 437
 438         CHECK_ALLOC_DONE(filter);
 439
 440         bidx = idx;
 441         for (i = 0; (i < IDMAP_LDAP_MAX_IDS) && ids[idx]; i++, idx++) {
 442
 443                 ids[idx]->status = ID_UNKNOWN;
 444
 445                 sidstr = ldap_encode_ndr_dom_sid(talloc_tos(), ids[idx]->sid);
 446                 filter = talloc_asprintf_append_buffer(filter, "(objectSid=%s)", sidstr);
 447
 448                 TALLOC_FREE(sidstr);
 449                 CHECK_ALLOC_DONE(filter);
 450         }
 451         filter = talloc_asprintf_append_buffer(filter, "))");
 452         CHECK_ALLOC_DONE(filter);
 453         DEBUG(10, ("Filter: [%s]\n", filter));
 454
 455         rc = ads_search_retry(ctx->ads, &res, filter, attrs);
 456         if (!ADS_ERR_OK(rc)) {
 457                 DEBUG(1, ("ERROR: ads search returned: %s\n", ads_errstr(rc)));
 458                 ret = NT_STATUS_UNSUCCESSFUL;
 459                 goto done;
 460         }
 461
 462         if ( (count = ads_count_replies(ctx->ads, res)) == 0 ) {
 463                 DEBUG(10, ("No IDs found\n"));
 464         }
 465
 466         entry = res;
 467         for (i = 0; (i < count) && entry; i++) {
 468                 struct dom_sid sid;
 469                 enum id_type type;
 470                 struct id_map *map;
 471                 uint32_t id;
 472                 uint32_t atype;
 473
 474                 if (i == 0) { /* first entry */
 475                         entry = ads_first_entry(ctx->ads, entry);
 476                 } else { /* following ones */
 477                         entry = ads_next_entry(ctx->ads, entry);
 478                 }
 479
 480                 if ( !entry ) {
 481                         DEBUG(2, ("ERROR: Unable to fetch ldap entries from results\n"));
 482                         break;
 483                 }
 484
 485                 /* first check if the SID is present */
 486                 if (!ads_pull_sid(ctx->ads, entry, "objectSid", &sid)) {
 487                         DEBUG(2, ("Could not retrieve SID from entry\n"));
 488                         continue;
 489                 }
 490
 491                 map = idmap_find_map_by_sid(&ids[bidx], &sid);
 492                 if (!map) {
 493                         DEBUG(2, ("WARNING: couldn't match result with requested SID\n"));
 494                         continue;
 495                 }
 496
 497                 /* get type */
 498                 if (!ads_pull_uint32(ctx->ads, entry, "sAMAccountType", &atype)) {
 499                         DEBUG(1, ("could not get SAM account type\n"));
 500                         continue;
 501                 }
 502
 503                 switch (atype & 0xF0000000) {
 504                 case ATYPE_SECURITY_GLOBAL_GROUP:
 505                 case ATYPE_SECURITY_LOCAL_GROUP:
 506                         type = ID_TYPE_GID;
 507                         break;
 508                 case ATYPE_NORMAL_ACCOUNT:
 509                 case ATYPE_WORKSTATION_TRUST:
 510                 case ATYPE_INTERDOMAIN_TRUST:
 511                         type = ID_TYPE_UID;
 512                         break;
 513                 default:
 514                         DEBUG(1, ("unrecognized SAM account type %08x\n", atype));
 515                         continue;
 516                 }
 517
 518                 if (!ads_pull_uint32(ctx->ads, entry, (type==ID_TYPE_UID) ?
 519                                                  ctx->ad_schema->posix_uidnumber_attr :
 520                                                  ctx->ad_schema->posix_gidnumber_attr,
 521                                      &id))
 522                 {
 523                         DEBUG(1, ("Could not get unix ID for SID %s\n",
 524                                 sid_string_dbg(map->sid)));
 525                         continue;
 526                 }
 527                 if (!idmap_unix_id_is_in_range(id, dom)) {
 528                         DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 529                                 id, dom->low_id, dom->high_id));
 530                         continue;
 531                 }
 532
 533                 /* mapped */
 534                 map->xid.type = type;
 535                 map->xid.id = id;
 536                 map->status = ID_MAPPED;
 537
 538                 DEBUG(10, ("Mapped %s -> %lu (%d)\n", sid_string_dbg(map->sid),
 539                            (unsigned long)map->xid.id,
 540                            map->xid.type));
 541         }
 542
 543         if (res) {
 544                 ads_msgfree(ctx->ads, res);
 545         }
 546
 547         if (ids[idx]) { /* still some values to map */
 548                 goto again;
 549         }
 550
 551         ret = NT_STATUS_OK;
 552
 553         /* mark all unknown/expired ones as unmapped */
 554         for (i = 0; ids[i]; i++) {
 555                 if (ids[i]->status != ID_MAPPED)
 556                         ids[i]->status = ID_UNMAPPED;
 557         }
 558
 559 done:
 560         talloc_free(memctx);
 561         return ret;
 562 }
 563
 564 /************************************************************************
 565  Function dispatch tables for the idmap and nss plugins
 566  ***********************************************************************/
 567
 568 static struct idmap_methods ad_methods = {
 569         .init            = idmap_ad_initialize,
 570         .unixids_to_sids = idmap_ad_unixids_to_sids,
 571         .sids_to_unixids = idmap_ad_sids_to_unixids,
 572 };
 573
 574 /************************************************************************
 575  Initialize the plugins
 576  ***********************************************************************/
 577
 578 static_decl_idmap;
 579 NTSTATUS idmap_ad_init(void)
 580 {
 581         static NTSTATUS status_idmap_ad = NT_STATUS_UNSUCCESSFUL;
 582         static NTSTATUS status_ad_nss = NT_STATUS_UNSUCCESSFUL;
 583
 584         /* Always register the AD method first in order to get the
 585            idmap_domain interface called */
 586
 587         if ( !NT_STATUS_IS_OK(status_idmap_ad) ) {
 588                 status_idmap_ad = smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION,
 589                                                      "ad", &ad_methods);
 590                 if ( !NT_STATUS_IS_OK(status_idmap_ad) )
 591                         return status_idmap_ad;
 592         }
 593
 594         if ( !NT_STATUS_IS_OK( status_ad_nss ) ) {
 595                 status_ad_nss = idmap_ad_nss_init();
 596                 if ( !NT_STATUS_IS_OK(status_ad_nss) )
 597                         return status_ad_nss;
 598         }
 599
 600         return NT_STATUS_OK;
 601 }