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                                     "",
 189                                     LOOKUP_NAME_NO_NSS);
 190         if (tevent_req_nomem(subreq, state->req)) {
 191                 return;
 192         }
 193         tevent_req_set_callback(subreq,
 194                                 wb_xids2sids_init_dom_maps_lookupname_done,
 195                                 state->req);
 196 }
 197
 198 static void wb_xids2sids_init_dom_maps_lookupname_done(
 199         struct tevent_req *subreq)
 200 {
 201         struct tevent_req *req = tevent_req_callback_data(
 202                 subreq, struct tevent_req);
 203         struct wb_xids2sids_init_dom_maps_state *state = tevent_req_data(
 204                 req, struct wb_xids2sids_init_dom_maps_state);
 205         enum lsa_SidType type;
 206         NTSTATUS status;
 207
 208         status = wb_lookupname_recv(subreq,
 209                                     &dom_maps[state->dom_idx].sid,
 210                                     &type);
 211         TALLOC_FREE(subreq);
 212         if (!NT_STATUS_IS_OK(status)) {
 213                 DBG_WARNING("Lookup domain name '%s' failed '%s'\n",
 214                             dom_maps[state->dom_idx].name,
 215                             nt_errstr(status));
 216
 217                 state->dom_idx++;
 218                 wb_xids2sids_init_dom_maps_lookupname_next(state);
 219                 return;
 220         }
 221
 222         if (type != SID_NAME_DOMAIN) {
 223                 DBG_WARNING("SID %s for idmap domain name '%s' "
 224                             "not a domain SID\n",
 225                             sid_string_dbg(&dom_maps[state->dom_idx].sid),
 226                             dom_maps[state->dom_idx].name);
 227
 228                 ZERO_STRUCT(dom_maps[state->dom_idx].sid);
 229         }
 230
 231         state->dom_idx++;
 232         wb_xids2sids_init_dom_maps_lookupname_next(state);
 233
 234         return;
 235 }
 236
 237 static NTSTATUS wb_xids2sids_init_dom_maps_recv(struct tevent_req *req)
 238 {
 239         return tevent_req_simple_recv_ntstatus(req);
 240 }
 241
 242 struct wb_xids2sids_dom_state {
 243         struct tevent_context *ev;
 244         struct unixid *all_xids;
 245         size_t num_all_xids;
 246         struct dom_sid *all_sids;
 247         struct wb_xids2sids_dom_map *dom_map;
 248         bool tried_dclookup;
 249
 250         size_t num_dom_xids;
 251         struct unixid *dom_xids;
 252         struct dom_sid *dom_sids;
 253 };
 254
 255 static void wb_xids2sids_dom_done(struct tevent_req *subreq);
 256 static void wb_xids2sids_dom_gotdc(struct tevent_req *subreq);
 257
 258 static struct tevent_req *wb_xids2sids_dom_send(
 259         TALLOC_CTX *mem_ctx, struct tevent_context *ev,
 260         struct wb_xids2sids_dom_map *dom_map,
 261         struct unixid *xids, size_t num_xids, struct dom_sid *sids)
 262 {
 263         struct tevent_req *req, *subreq;
 264         struct wb_xids2sids_dom_state *state;
 265         struct winbindd_child *child;
 266         size_t i;
 267
 268         req = tevent_req_create(mem_ctx, &state,
 269                                 struct wb_xids2sids_dom_state);
 270         if (req == NULL) {
 271                 return NULL;
 272         }
 273         state->ev = ev;
 274         state->all_xids = xids;
 275         state->num_all_xids = num_xids;
 276         state->all_sids = sids;
 277         state->dom_map = dom_map;
 278
 279         state->dom_xids = talloc_array(state, struct unixid, num_xids);
 280         if (tevent_req_nomem(state->dom_xids, req)) {
 281                 return tevent_req_post(req, ev);
 282         }
 283         state->dom_sids = talloc_array(state, struct dom_sid, num_xids);
 284         if (tevent_req_nomem(state->dom_sids, req)) {
 285                 return tevent_req_post(req, ev);
 286         }
 287
 288         for (i=0; i<num_xids; i++) {
 289                 struct unixid id = state->all_xids[i];
 290
 291                 if ((id.id < dom_map->low_id) || (id.id > dom_map->high_id)) {
 292                         /* out of range */
 293                         continue;
 294                 }
 295                 if (!is_null_sid(&state->all_sids[i])) {
 296                         /* already mapped */
 297                         continue;
 298                 }
 299                 state->dom_xids[state->num_dom_xids++] = id;
 300         }
 301
 302         if (state->num_dom_xids == 0) {
 303                 tevent_req_done(req);
 304                 return tevent_req_post(req, ev);
 305         }
 306
 307         child = idmap_child();
 308         subreq = dcerpc_wbint_UnixIDs2Sids_send(
 309                 state, ev, child->binding_handle, dom_map->name, dom_map->sid,
 310                 state->num_dom_xids, state->dom_xids, state->dom_sids);
 311         if (tevent_req_nomem(subreq, req)) {
 312                 return tevent_req_post(req, ev);
 313         }
 314         tevent_req_set_callback(subreq, wb_xids2sids_dom_done, req);
 315         return req;
 316 }
 317
 318 static void wb_xids2sids_dom_done(struct tevent_req *subreq)
 319 {
 320         struct tevent_req *req = tevent_req_callback_data(
 321                 subreq, struct tevent_req);
 322         struct wb_xids2sids_dom_state *state = tevent_req_data(
 323                 req, struct wb_xids2sids_dom_state);
 324         struct wb_xids2sids_dom_map *dom_map = state->dom_map;
 325         NTSTATUS status, result;
 326         size_t i;
 327         size_t dom_sid_idx;
 328
 329         status = dcerpc_wbint_UnixIDs2Sids_recv(subreq, state, &result);
 330         TALLOC_FREE(subreq);
 331         if (tevent_req_nterror(req, status)) {
 332                 return;
 333         }
 334
 335         if (NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) &&
 336             !state->tried_dclookup) {
 337
 338                 subreq = wb_dsgetdcname_send(
 339                         state, state->ev, state->dom_map->name, NULL, NULL,
 340                         DS_RETURN_DNS_NAME);
 341                 if (tevent_req_nomem(subreq, req)) {
 342                         return;
 343                 }
 344                 tevent_req_set_callback(subreq, wb_xids2sids_dom_gotdc, req);
 345                 return;
 346         }
 347
 348         if (!NT_STATUS_EQUAL(result, NT_STATUS_NONE_MAPPED) &&
 349             tevent_req_nterror(req, result)) {
 350                 return;
 351         }
 352
 353         dom_sid_idx = 0;
 354
 355         for (i=0; i<state->num_all_xids; i++) {
 356                 struct unixid id = state->all_xids[i];
 357
 358                 if ((id.id < dom_map->low_id) || (id.id > dom_map->high_id)) {
 359                         /* out of range */
 360                         continue;
 361                 }
 362                 if (!is_null_sid(&state->all_sids[i])) {
 363                         /* already mapped */
 364                         continue;
 365                 }
 366
 367                 sid_copy(&state->all_sids[i], &state->dom_sids[dom_sid_idx]);
 368
 369                 /*
 370                  * Prime the cache after an xid2sid call. It's
 371                  * important that we use state->dom_xids for the xid
 372                  * value, not state->all_xids: state->all_xids carries
 373                  * what we asked for, e.g. a
 374                  * ID_TYPE_UID. state->dom_xids holds something the
 375                  * idmap child possibly changed to ID_TYPE_BOTH.
 376                  */
 377                 idmap_cache_set_sid2unixid(
 378                         &state->all_sids[i], &state->dom_xids[dom_sid_idx]);
 379
 380                 dom_sid_idx += 1;
 381         }
 382
 383         tevent_req_done(req);
 384 }
 385
 386 static void wb_xids2sids_dom_gotdc(struct tevent_req *subreq)
 387 {
 388         struct tevent_req *req = tevent_req_callback_data(
 389                 subreq, struct tevent_req);
 390         struct wb_xids2sids_dom_state *state = tevent_req_data(
 391                 req, struct wb_xids2sids_dom_state);
 392         struct winbindd_child *child = idmap_child();
 393         struct netr_DsRGetDCNameInfo *dcinfo;
 394         NTSTATUS status;
 395
 396         status = wb_dsgetdcname_recv(subreq, state, &dcinfo);
 397         TALLOC_FREE(subreq);
 398         if (tevent_req_nterror(req, status)) {
 399                 return;
 400         }
 401
 402         state->tried_dclookup = true;
 403
 404         status = wb_dsgetdcname_gencache_set(state->dom_map->name, dcinfo);
 405         if (tevent_req_nterror(req, status)) {
 406                 return;
 407         }
 408
 409         child = idmap_child();
 410         subreq = dcerpc_wbint_UnixIDs2Sids_send(
 411                 state, state->ev, child->binding_handle, state->dom_map->name,
 412                 state->dom_map->sid, state->num_dom_xids,
 413                 state->dom_xids, state->dom_sids);
 414         if (tevent_req_nomem(subreq, req)) {
 415                 return;
 416         }
 417         tevent_req_set_callback(subreq, wb_xids2sids_dom_done, req);
 418 }
 419
 420 static NTSTATUS wb_xids2sids_dom_recv(struct tevent_req *req)
 421 {
 422         return tevent_req_simple_recv_ntstatus(req);
 423 }
 424
 425 struct wb_xids2sids_state {
 426         struct tevent_context *ev;
 427         struct unixid *xids;
 428         size_t num_xids;
 429         struct dom_sid *sids;
 430
 431         size_t dom_idx;
 432 };
 433
 434 static void wb_xids2sids_done(struct tevent_req *subreq);
 435 static void wb_xids2sids_init_dom_maps_done(struct tevent_req *subreq);
 436
 437 struct tevent_req *wb_xids2sids_send(TALLOC_CTX *mem_ctx,
 438                                      struct tevent_context *ev,
 439                                      struct unixid *xids,
 440                                      uint32_t num_xids)
 441 {
 442         struct tevent_req *req, *subreq;
 443         struct wb_xids2sids_state *state;
 444
 445         req = tevent_req_create(mem_ctx, &state,
 446                                 struct wb_xids2sids_state);
 447         if (req == NULL) {
 448                 return NULL;
 449         }
 450         state->ev = ev;
 451         state->xids = xids;
 452         state->num_xids = num_xids;
 453
 454         state->sids = talloc_zero_array(state, struct dom_sid, num_xids);
 455         if (tevent_req_nomem(state->sids, req)) {
 456                 return tevent_req_post(req, ev);
 457         }
 458
 459         if (winbindd_use_idmap_cache()) {
 460                 uint32_t i;
 461
 462                 for (i=0; i<num_xids; i++) {
 463                         struct dom_sid sid;
 464                         bool ok, expired;
 465
 466                         switch (xids[i].type) {
 467                             case ID_TYPE_UID:
 468                                     ok = idmap_cache_find_uid2sid(
 469                                             xids[i].id, &sid, &expired);
 470                                     break;
 471                             case ID_TYPE_GID:
 472                                     ok = idmap_cache_find_gid2sid(
 473                                             xids[i].id, &sid, &expired);
 474                                     break;
 475                             default:
 476                                     ok = false;
 477                         }
 478
 479                         if (ok && !expired) {
 480                                 sid_copy(&state->sids[i], &sid);
 481                         }
 482                 }
 483         }
 484
 485         subreq = wb_xids2sids_init_dom_maps_send(
 486                 state, state->ev);
 487         if (tevent_req_nomem(subreq, req)) {
 488                 return tevent_req_post(req, ev);
 489         }
 490         tevent_req_set_callback(subreq, wb_xids2sids_init_dom_maps_done, req);
 491         return req;
 492 }
 493
 494 static void wb_xids2sids_init_dom_maps_done(struct tevent_req *subreq)
 495 {
 496         struct tevent_req *req = tevent_req_callback_data(
 497                 subreq, struct tevent_req);
 498         struct wb_xids2sids_state *state = tevent_req_data(
 499                 req, struct wb_xids2sids_state);
 500         size_t num_domains;
 501         NTSTATUS status;
 502
 503         status = wb_xids2sids_init_dom_maps_recv(subreq);
 504         TALLOC_FREE(subreq);
 505         if (tevent_req_nterror(req, status)) {
 506                 return;
 507         }
 508
 509         num_domains = talloc_array_length(dom_maps);
 510         if (num_domains == 0) {
 511                 tevent_req_done(req);
 512                 return;
 513         }
 514
 515         subreq = wb_xids2sids_dom_send(
 516                 state, state->ev, &dom_maps[state->dom_idx],
 517                 state->xids, state->num_xids, state->sids);
 518         if (tevent_req_nomem(subreq, req)) {
 519                 return;
 520         }
 521         tevent_req_set_callback(subreq, wb_xids2sids_done, req);
 522         return;
 523 }
 524
 525 static void wb_xids2sids_done(struct tevent_req *subreq)
 526 {
 527         struct tevent_req *req = tevent_req_callback_data(
 528                 subreq, struct tevent_req);
 529         struct wb_xids2sids_state *state = tevent_req_data(
 530                 req, struct wb_xids2sids_state);
 531         size_t num_domains = talloc_array_length(dom_maps);
 532         NTSTATUS status;
 533
 534         status = wb_xids2sids_dom_recv(subreq);
 535         TALLOC_FREE(subreq);
 536         if (tevent_req_nterror(req, status)) {
 537                 return;
 538         }
 539
 540         state->dom_idx += 1;
 541
 542         if (state->dom_idx >= num_domains) {
 543                 tevent_req_done(req);
 544                 return;
 545         }
 546
 547         subreq = wb_xids2sids_dom_send(
 548                 state, state->ev, &dom_maps[state->dom_idx],
 549                 state->xids, state->num_xids, state->sids);
 550         if (tevent_req_nomem(subreq, req)) {
 551                 return;
 552         }
 553         tevent_req_set_callback(subreq, wb_xids2sids_done, req);
 554 }
 555
 556 NTSTATUS wb_xids2sids_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 557                            struct dom_sid **sids)
 558 {
 559         struct wb_xids2sids_state *state = tevent_req_data(
 560                 req, struct wb_xids2sids_state);
 561         NTSTATUS status;
 562
 563         if (tevent_req_is_nterror(req, &status)) {
 564                 DEBUG(5, ("wb_sids_to_xids failed: %s\n", nt_errstr(status)));
 565                 return status;
 566         }
 567
 568         *sids = talloc_move(mem_ctx, &state->sids);
 569         return NT_STATUS_OK;
 570 }