source3/winbindd/wb_xids2sids.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * async xids2sids
   4  * Copyright (C) Volker Lendecke 2015
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21 #include "winbindd.h"
  22 #include "../libcli/security/security.h"
  23 #include "idmap_cache.h"
  24 #include "librpc/gen_ndr/ndr_winbind_c.h"
  25 #include "librpc/gen_ndr/ndr_netlogon.h"
  26 #include "passdb/lookup_sid.h"
  27
  28 struct wb_xids2sids_dom_map {
  29         unsigned low_id;
  30         unsigned high_id;
  31         const char *name;
  32         struct dom_sid sid;
  33 };
  34
  35 /*
  36  * Map idmap ranges to domain names, taken from smb.conf. This is
  37  * stored in the parent winbind and used to assemble xid2sid calls
  38  * into per-idmap-domain chunks.
  39  */
  40 static struct wb_xids2sids_dom_map *dom_maps;
  41
  42 static bool wb_xids2sids_add_dom(const char *domname,
  43                                  void *private_data)
  44 {
  45         struct wb_xids2sids_dom_map *map = NULL;
  46         size_t num_maps = talloc_array_length(dom_maps);
  47         size_t i;
  48         const char *range;
  49         unsigned low_id, high_id;
  50         int ret;
  51
  52         range = idmap_config_const_string(domname, "range", NULL);
  53         if (range == NULL) {
  54                 DBG_DEBUG("No range for domain %s found\n", domname);
  55                 return false;
  56         }
  57
  58         ret = sscanf(range, "%u - %u", &low_id, &high_id);
  59         if (ret != 2) {
  60                 DBG_DEBUG("Invalid range spec \"%s\" for domain %s\n",
  61                           range, domname);
  62                 return false;
  63         }
  64
  65         if (low_id > high_id) {
  66                 DBG_DEBUG("Invalid range %u - %u for domain %s\n",
  67                           low_id, high_id, domname);
  68                 return false;
  69         }
  70
  71         for (i=0; i<num_maps; i++) {
  72                 if (strequal(domname, dom_maps[i].name)) {
  73                         map = &dom_maps[i];
  74                         break;
  75                 }
  76         }
  77
  78         if (map == NULL) {
  79                 struct wb_xids2sids_dom_map *tmp;
  80                 char *name;
  81
  82                 name = talloc_strdup(talloc_tos(), domname);
  83                 if (name == NULL) {
  84                         DBG_DEBUG("talloc failed\n");
  85                         return false;
  86                 }
  87
  88                 tmp = talloc_realloc(
  89                         NULL, dom_maps, struct wb_xids2sids_dom_map,
  90                         num_maps+1);
  91                 if (tmp == NULL) {
  92                         TALLOC_FREE(name);
  93                         return false;
  94                 }
  95                 dom_maps = tmp;
  96
  97                 map = &dom_maps[num_maps];
  98                 ZERO_STRUCTP(map);
  99                 map->name = talloc_move(dom_maps, &name);
 100         }
 101
 102         map->low_id = low_id;
 103         map->high_id = high_id;
 104
 105         return false;
 106 }
 107
 108 struct wb_xids2sids_init_dom_maps_state {
 109         struct tevent_context *ev;
 110         struct tevent_req *req;
 111         size_t dom_idx;
 112 };
 113
 114 static void wb_xids2sids_init_dom_maps_lookupname_next(
 115         struct wb_xids2sids_init_dom_maps_state *state);
 116
 117 static void wb_xids2sids_init_dom_maps_lookupname_done(
 118         struct tevent_req *subreq);
 119
 120 static struct tevent_req *wb_xids2sids_init_dom_maps_send(
 121         TALLOC_CTX *mem_ctx, struct tevent_context *ev)
 122 {
 123         struct tevent_req *req = NULL;
 124         struct wb_xids2sids_init_dom_maps_state *state = NULL;
 125
 126         req = tevent_req_create(mem_ctx, &state,
 127                                 struct wb_xids2sids_init_dom_maps_state);
 128         if (req == NULL) {
 129                 return NULL;
 130         }
 131         *state = (struct wb_xids2sids_init_dom_maps_state) {
 132                 .ev = ev,
 133                 .req = req,
 134                 .dom_idx = 0,
 135         };
 136
 137         if (dom_maps != NULL) {
 138                 tevent_req_done(req);
 139                 return tevent_req_post(req, ev);
 140         }
 141         /*
 142          * Put the passdb idmap domain first. We always need to try
 143          * there first.
 144          */
 145
 146         dom_maps = talloc_zero_array(NULL, struct wb_xids2sids_dom_map, 1);
 147         if (tevent_req_nomem(dom_maps, req)) {
 148                 return tevent_req_post(req, ev);
 149         }
 150         dom_maps[0].low_id = 0;
 151         dom_maps[0].high_id = UINT_MAX;
 152         dom_maps[0].name = talloc_strdup(dom_maps, get_global_sam_name());
 153         if (tevent_req_nomem(dom_maps[0].name, req)) {
 154                 TALLOC_FREE(dom_maps);
 155                 return tevent_req_post(req, ev);
 156         }
 157
 158         lp_scan_idmap_domains(wb_xids2sids_add_dom, NULL);
 159
 160         wb_xids2sids_init_dom_maps_lookupname_next(state);
 161         if (!tevent_req_is_in_progress(req)) {
 162                 tevent_req_post(req, ev);
 163         }
 164         return req;
 165 }
 166
 167 static void wb_xids2sids_init_dom_maps_lookupname_next(
 168         struct wb_xids2sids_init_dom_maps_state *state)
 169 {
 170         struct tevent_req *subreq = NULL;
 171
 172         if (state->dom_idx == talloc_array_length(dom_maps)) {
 173                 tevent_req_done(state->req);
 174                 return;
 175         }
 176
 177         if (strequal(dom_maps[state->dom_idx].name, "*")) {
 178                 state->dom_idx++;
 179                 if (state->dom_idx == talloc_array_length(dom_maps)) {
 180                         tevent_req_done(state->req);
 181                         return;
 182                 }
 183         }
 184
 185         subreq = wb_lookupname_send(state,
 186                                     state->ev,
 187                                     dom_maps[state->dom_idx].name,
 188                                     dom_maps[state->dom_idx].name,
 189                                     "",
 190                                     LOOKUP_NAME_NO_NSS);
 191         if (tevent_req_nomem(subreq, state->req)) {
 192                 return;
 193         }
 194         tevent_req_set_callback(subreq,
 195                                 wb_xids2sids_init_dom_maps_lookupname_done,
 196                                 state->req);
 197 }
 198
 199 static void wb_xids2sids_init_dom_maps_lookupname_done(
 200         struct tevent_req *subreq)
 201 {
 202         struct tevent_req *req = tevent_req_callback_data(
 203                 subreq, struct tevent_req);
 204         struct wb_xids2sids_init_dom_maps_state *state = tevent_req_data(
 205                 req, struct wb_xids2sids_init_dom_maps_state);
 206         enum lsa_SidType type;
 207         NTSTATUS status;
 208
 209         status = wb_lookupname_recv(subreq,
 210                                     &dom_maps[state->dom_idx].sid,
 211                                     &type);
 212         TALLOC_FREE(subreq);
 213         if (!NT_STATUS_IS_OK(status)) {
 214                 DBG_WARNING("Lookup domain name '%s' failed '%s'\n",
 215                             dom_maps[state->dom_idx].name,
 216                             nt_errstr(status));
 217
 218                 state->dom_idx++;
 219                 wb_xids2sids_init_dom_maps_lookupname_next(state);
 220                 return;
 221         }
 222
 223         if (type != SID_NAME_DOMAIN) {
 224                 DBG_WARNING("SID %s for idmap domain name '%s' "
 225                             "not a domain SID\n",
 226                             sid_string_dbg(&dom_maps[state->dom_idx].sid),
 227                             dom_maps[state->dom_idx].name);
 228
 229                 ZERO_STRUCT(dom_maps[state->dom_idx].sid);
 230         }
 231
 232         state->dom_idx++;
 233         wb_xids2sids_init_dom_maps_lookupname_next(state);
 234
 235         return;
 236 }
 237
 238 static NTSTATUS wb_xids2sids_init_dom_maps_recv(struct tevent_req *req)
 239 {
 240         return tevent_req_simple_recv_ntstatus(req);
 241 }
 242
 243 struct wb_xids2sids_dom_state {
 244         struct tevent_context *ev;
 245         struct unixid *all_xids;
 246         size_t num_all_xids;
 247         struct dom_sid *all_sids;
 248         struct wb_xids2sids_dom_map *dom_map;
 249         bool tried_dclookup;
 250
 251         size_t num_dom_xids;
 252         struct unixid *dom_xids;
 253         struct dom_sid *dom_sids;
 254 };
 255
 256 static void wb_xids2sids_dom_done(struct tevent_req *subreq);
 257 static void wb_xids2sids_dom_gotdc(struct tevent_req *subreq);
 258
 259 static struct tevent_req *wb_xids2sids_dom_send(
 260         TALLOC_CTX *mem_ctx, struct tevent_context *ev,
 261         struct wb_xids2sids_dom_map *dom_map,
 262         struct unixid *xids, size_t num_xids, struct dom_sid *sids)
 263 {
 264         struct tevent_req *req, *subreq;
 265         struct wb_xids2sids_dom_state *state;
 266         struct winbindd_child *child;
 267         size_t i;
 268
 269         req = tevent_req_create(mem_ctx, &state,
 270                                 struct wb_xids2sids_dom_state);
 271         if (req == NULL) {
 272                 return NULL;
 273         }
 274         state->ev = ev;
 275         state->all_xids = xids;
 276         state->num_all_xids = num_xids;
 277         state->all_sids = sids;
 278         state->dom_map = dom_map;
 279
 280         state->dom_xids = talloc_array(state, struct unixid, num_xids);
 281         if (tevent_req_nomem(state->dom_xids, req)) {
 282                 return tevent_req_post(req, ev);
 283         }
 284         state->dom_sids = talloc_array(state, struct dom_sid, num_xids);
 285         if (tevent_req_nomem(state->dom_sids, req)) {
 286                 return tevent_req_post(req, ev);
 287         }
 288
 289         for (i=0; i<num_xids; i++) {
 290                 struct unixid id = state->all_xids[i];
 291
 292                 if ((id.id < dom_map->low_id) || (id.id > dom_map->high_id)) {
 293                         /* out of range */
 294                         continue;
 295                 }
 296                 if (!is_null_sid(&state->all_sids[i])) {
 297                         /* already mapped */
 298                         continue;
 299                 }
 300                 state->dom_xids[state->num_dom_xids++] = id;
 301         }
 302
 303         if (state->num_dom_xids == 0) {
 304                 tevent_req_done(req);
 305                 return tevent_req_post(req, ev);
 306         }
 307
 308         child = idmap_child();
 309         subreq = dcerpc_wbint_UnixIDs2Sids_send(
 310                 state, ev, child->binding_handle, dom_map->name, dom_map->sid,
 311                 state->num_dom_xids, state->dom_xids, state->dom_sids);
 312         if (tevent_req_nomem(subreq, req)) {
 313                 return tevent_req_post(req, ev);
 314         }
 315         tevent_req_set_callback(subreq, wb_xids2sids_dom_done, req);
 316         return req;
 317 }
 318
 319 static void wb_xids2sids_dom_done(struct tevent_req *subreq)
 320 {
 321         struct tevent_req *req = tevent_req_callback_data(
 322                 subreq, struct tevent_req);
 323         struct wb_xids2sids_dom_state *state = tevent_req_data(
 324                 req, struct wb_xids2sids_dom_state);
 325         struct wb_xids2sids_dom_map *dom_map = state->dom_map;
 326         NTSTATUS status, result;
 327         size_t i;
 328         size_t dom_sid_idx;
 329
 330         status = dcerpc_wbint_UnixIDs2Sids_recv(subreq, state, &result);
 331         TALLOC_FREE(subreq);
 332         if (tevent_req_nterror(req, status)) {
 333                 return;
 334         }
 335
 336         if (NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) &&
 337             !state->tried_dclookup) {
 338
 339                 subreq = wb_dsgetdcname_send(
 340                         state, state->ev, state->dom_map->name, NULL, NULL,
 341                         DS_RETURN_DNS_NAME);
 342                 if (tevent_req_nomem(subreq, req)) {
 343                         return;
 344                 }
 345                 tevent_req_set_callback(subreq, wb_xids2sids_dom_gotdc, req);
 346                 return;
 347         }
 348
 349         if (!NT_STATUS_EQUAL(result, NT_STATUS_NONE_MAPPED) &&
 350             tevent_req_nterror(req, result)) {
 351                 return;
 352         }
 353
 354         dom_sid_idx = 0;
 355
 356         for (i=0; i<state->num_all_xids; i++) {
 357                 struct unixid id = state->all_xids[i];
 358
 359                 if ((id.id < dom_map->low_id) || (id.id > dom_map->high_id)) {
 360                         /* out of range */
 361                         continue;
 362                 }
 363                 if (!is_null_sid(&state->all_sids[i])) {
 364                         /* already mapped */
 365                         continue;
 366                 }
 367
 368                 sid_copy(&state->all_sids[i], &state->dom_sids[dom_sid_idx]);
 369
 370                 /*
 371                  * Prime the cache after an xid2sid call. It's
 372                  * important that we use state->dom_xids for the xid
 373                  * value, not state->all_xids: state->all_xids carries
 374                  * what we asked for, e.g. a
 375                  * ID_TYPE_UID. state->dom_xids holds something the
 376                  * idmap child possibly changed to ID_TYPE_BOTH.
 377                  */
 378                 idmap_cache_set_sid2unixid(
 379                         &state->all_sids[i], &state->dom_xids[dom_sid_idx]);
 380
 381                 dom_sid_idx += 1;
 382         }
 383
 384         tevent_req_done(req);
 385 }
 386
 387 static void wb_xids2sids_dom_gotdc(struct tevent_req *subreq)
 388 {
 389         struct tevent_req *req = tevent_req_callback_data(
 390                 subreq, struct tevent_req);
 391         struct wb_xids2sids_dom_state *state = tevent_req_data(
 392                 req, struct wb_xids2sids_dom_state);
 393         struct winbindd_child *child = idmap_child();
 394         struct netr_DsRGetDCNameInfo *dcinfo;
 395         NTSTATUS status;
 396
 397         status = wb_dsgetdcname_recv(subreq, state, &dcinfo);
 398         TALLOC_FREE(subreq);
 399         if (tevent_req_nterror(req, status)) {
 400                 return;
 401         }
 402
 403         state->tried_dclookup = true;
 404
 405         status = wb_dsgetdcname_gencache_set(state->dom_map->name, dcinfo);
 406         if (tevent_req_nterror(req, status)) {
 407                 return;
 408         }
 409
 410         child = idmap_child();
 411         subreq = dcerpc_wbint_UnixIDs2Sids_send(
 412                 state, state->ev, child->binding_handle, state->dom_map->name,
 413                 state->dom_map->sid, state->num_dom_xids,
 414                 state->dom_xids, state->dom_sids);
 415         if (tevent_req_nomem(subreq, req)) {
 416                 return;
 417         }
 418         tevent_req_set_callback(subreq, wb_xids2sids_dom_done, req);
 419 }
 420
 421 static NTSTATUS wb_xids2sids_dom_recv(struct tevent_req *req)
 422 {
 423         return tevent_req_simple_recv_ntstatus(req);
 424 }
 425
 426 struct wb_xids2sids_state {
 427         struct tevent_context *ev;
 428         struct unixid *xids;
 429         size_t num_xids;
 430         struct dom_sid *sids;
 431
 432         size_t dom_idx;
 433 };
 434
 435 static void wb_xids2sids_done(struct tevent_req *subreq);
 436 static void wb_xids2sids_init_dom_maps_done(struct tevent_req *subreq);
 437
 438 struct tevent_req *wb_xids2sids_send(TALLOC_CTX *mem_ctx,
 439                                      struct tevent_context *ev,
 440                                      struct unixid *xids,
 441                                      uint32_t num_xids)
 442 {
 443         struct tevent_req *req, *subreq;
 444         struct wb_xids2sids_state *state;
 445
 446         req = tevent_req_create(mem_ctx, &state,
 447                                 struct wb_xids2sids_state);
 448         if (req == NULL) {
 449                 return NULL;
 450         }
 451         state->ev = ev;
 452         state->num_xids = num_xids;
 453
 454         state->xids = talloc_array(state, struct unixid, num_xids);
 455         if (tevent_req_nomem(state->xids, req)) {
 456                 return tevent_req_post(req, ev);
 457         }
 458         memcpy(state->xids, xids, num_xids * sizeof(struct unixid));
 459
 460         state->sids = talloc_zero_array(state, struct dom_sid, num_xids);
 461         if (tevent_req_nomem(state->sids, req)) {
 462                 return tevent_req_post(req, ev);
 463         }
 464
 465         if (winbindd_use_idmap_cache()) {
 466                 uint32_t i;
 467
 468                 for (i=0; i<num_xids; i++) {
 469                         struct dom_sid sid;
 470                         bool ok, expired;
 471
 472                         switch (xids[i].type) {
 473                             case ID_TYPE_UID:
 474                                     ok = idmap_cache_find_uid2sid(
 475                                             xids[i].id, &sid, &expired);
 476                                     break;
 477                             case ID_TYPE_GID:
 478                                     ok = idmap_cache_find_gid2sid(
 479                                             xids[i].id, &sid, &expired);
 480                                     break;
 481                             default:
 482                                     ok = false;
 483                         }
 484
 485                         if (ok && !expired) {
 486                                 sid_copy(&state->sids[i], &sid);
 487                         }
 488                 }
 489         }
 490
 491         subreq = wb_xids2sids_init_dom_maps_send(
 492                 state, state->ev);
 493         if (tevent_req_nomem(subreq, req)) {
 494                 return tevent_req_post(req, ev);
 495         }
 496         tevent_req_set_callback(subreq, wb_xids2sids_init_dom_maps_done, req);
 497         return req;
 498 }
 499
 500 static void wb_xids2sids_init_dom_maps_done(struct tevent_req *subreq)
 501 {
 502         struct tevent_req *req = tevent_req_callback_data(
 503                 subreq, struct tevent_req);
 504         struct wb_xids2sids_state *state = tevent_req_data(
 505                 req, struct wb_xids2sids_state);
 506         size_t num_domains;
 507         NTSTATUS status;
 508
 509         status = wb_xids2sids_init_dom_maps_recv(subreq);
 510         TALLOC_FREE(subreq);
 511         if (tevent_req_nterror(req, status)) {
 512                 return;
 513         }
 514
 515         num_domains = talloc_array_length(dom_maps);
 516         if (num_domains == 0) {
 517                 tevent_req_done(req);
 518                 return;
 519         }
 520
 521         subreq = wb_xids2sids_dom_send(
 522                 state, state->ev, &dom_maps[state->dom_idx],
 523                 state->xids, state->num_xids, state->sids);
 524         if (tevent_req_nomem(subreq, req)) {
 525                 return;
 526         }
 527         tevent_req_set_callback(subreq, wb_xids2sids_done, req);
 528         return;
 529 }
 530
 531 static void wb_xids2sids_done(struct tevent_req *subreq)
 532 {
 533         struct tevent_req *req = tevent_req_callback_data(
 534                 subreq, struct tevent_req);
 535         struct wb_xids2sids_state *state = tevent_req_data(
 536                 req, struct wb_xids2sids_state);
 537         size_t num_domains = talloc_array_length(dom_maps);
 538         NTSTATUS status;
 539
 540         status = wb_xids2sids_dom_recv(subreq);
 541         TALLOC_FREE(subreq);
 542         if (tevent_req_nterror(req, status)) {
 543                 return;
 544         }
 545
 546         state->dom_idx += 1;
 547
 548         if (state->dom_idx >= num_domains) {
 549                 tevent_req_done(req);
 550                 return;
 551         }
 552
 553         subreq = wb_xids2sids_dom_send(
 554                 state, state->ev, &dom_maps[state->dom_idx],
 555                 state->xids, state->num_xids, state->sids);
 556         if (tevent_req_nomem(subreq, req)) {
 557                 return;
 558         }
 559         tevent_req_set_callback(subreq, wb_xids2sids_done, req);
 560 }
 561
 562 NTSTATUS wb_xids2sids_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 563                            struct dom_sid **sids)
 564 {
 565         struct wb_xids2sids_state *state = tevent_req_data(
 566                 req, struct wb_xids2sids_state);
 567         NTSTATUS status;
 568
 569         if (tevent_req_is_nterror(req, &status)) {
 570                 DEBUG(5, ("wb_sids_to_xids failed: %s\n", nt_errstr(status)));
 571                 return status;
 572         }
 573
 574         *sids = talloc_move(mem_ctx, &state->sids);
 575         return NT_STATUS_OK;
 576 }