source3/winbindd/wb_sids2xids.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    async sids2xids
   4    Copyright (C) Volker Lendecke 2011
   5    Copyright (C) Michael Adam 2012
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "winbindd.h"
  23 #include "../libcli/security/security.h"
  24 #include "idmap_cache.h"
  25 #include "librpc/gen_ndr/ndr_winbind_c.h"
  26 #include "librpc/gen_ndr/ndr_netlogon.h"
  27 #include "lsa.h"
  28
  29 struct wb_sids2xids_state {
  30         struct tevent_context *ev;
  31
  32         struct dom_sid *sids;
  33         uint32_t num_sids;
  34
  35         struct id_map *cached;
  36
  37         struct dom_sid *non_cached;
  38         uint32_t num_non_cached;
  39
  40         /*
  41          * Domain array to use for the idmap call. The output from
  42          * lookupsids cannot be used directly since for migrated
  43          * objects the returned domain SID can be different than the
  44          * original one. The new domain SID cannot be combined with
  45          * the RID from the previous domain.
  46          *
  47          * The proper way would be asking for the correct RID in the
  48          * new domain, but this approach avoids id mappings for
  49          * invalid SIDs.
  50          */
  51         struct lsa_RefDomainList idmap_doms;
  52
  53         uint32_t dom_index;
  54         struct wbint_TransIDArray *dom_ids;
  55         struct lsa_RefDomainList idmap_dom;
  56         bool tried_dclookup;
  57
  58         struct wbint_TransIDArray ids;
  59 };
  60
  61
  62 static bool wb_sids2xids_in_cache(struct dom_sid *sid, struct id_map *map);
  63 static void wb_sids2xids_lookupsids_done(struct tevent_req *subreq);
  64 static void wb_sids2xids_done(struct tevent_req *subreq);
  65 static void wb_sids2xids_gotdc(struct tevent_req *subreq);
  66
  67 struct tevent_req *wb_sids2xids_send(TALLOC_CTX *mem_ctx,
  68                                      struct tevent_context *ev,
  69                                      const struct dom_sid *sids,
  70                                      const uint32_t num_sids)
  71 {
  72         struct tevent_req *req, *subreq;
  73         struct wb_sids2xids_state *state;
  74         uint32_t i;
  75
  76         req = tevent_req_create(mem_ctx, &state,
  77                                 struct wb_sids2xids_state);
  78         if (req == NULL) {
  79                 return NULL;
  80         }
  81
  82         state->ev = ev;
  83
  84         state->num_sids = num_sids;
  85
  86         state->sids = talloc_zero_array(state, struct dom_sid, num_sids);
  87         if (tevent_req_nomem(state->sids, req)) {
  88                 return tevent_req_post(req, ev);
  89         }
  90
  91         for (i = 0; i < num_sids; i++) {
  92                 sid_copy(&state->sids[i], &sids[i]);
  93         }
  94
  95         state->cached = talloc_zero_array(state, struct id_map, num_sids);
  96         if (tevent_req_nomem(state->cached, req)) {
  97                 return tevent_req_post(req, ev);
  98         }
  99
 100         state->non_cached = talloc_array(state, struct dom_sid, num_sids);
 101         if (tevent_req_nomem(state->non_cached, req)) {
 102                 return tevent_req_post(req, ev);
 103         }
 104
 105         /*
 106          * Extract those sids that can not be resolved from cache
 107          * into a separate list to be handed to id mapping, keeping
 108          * the same index.
 109          */
 110         for (i=0; i<state->num_sids; i++) {
 111                 struct dom_sid_buf buf;
 112
 113                 DEBUG(10, ("SID %d: %s\n", (int)i,
 114                            dom_sid_str_buf(&state->sids[i], &buf)));
 115
 116                 if (wb_sids2xids_in_cache(&state->sids[i], &state->cached[i])) {
 117                         continue;
 118                 }
 119                 sid_copy(&state->non_cached[state->num_non_cached],
 120                          &state->sids[i]);
 121                 state->num_non_cached += 1;
 122         }
 123
 124         if (state->num_non_cached == 0) {
 125                 tevent_req_done(req);
 126                 return tevent_req_post(req, ev);
 127         }
 128
 129         subreq = wb_lookupsids_send(state, ev, state->non_cached,
 130                                     state->num_non_cached);
 131         if (tevent_req_nomem(subreq, req)) {
 132                 return tevent_req_post(req, ev);
 133         }
 134         tevent_req_set_callback(subreq, wb_sids2xids_lookupsids_done, req);
 135         return req;
 136 }
 137
 138 static bool wb_sids2xids_in_cache(struct dom_sid *sid, struct id_map *map)
 139 {
 140         struct unixid id;
 141         bool expired;
 142
 143         if (!winbindd_use_idmap_cache()) {
 144                 return false;
 145         }
 146         if (idmap_cache_find_sid2unixid(sid, &id, &expired)) {
 147                 if (expired && is_domain_online(find_our_domain())) {
 148                         return false;
 149                 }
 150                 map->sid = sid;
 151                 map->xid = id;
 152                 map->status = ID_MAPPED;
 153                 return true;
 154         }
 155         return false;
 156 }
 157
 158 static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type);
 159 static struct wbint_TransIDArray *wb_sids2xids_extract_for_domain_index(
 160         TALLOC_CTX *mem_ctx, const struct wbint_TransIDArray *src,
 161         uint32_t domain_index);
 162
 163 static void wb_sids2xids_lookupsids_done(struct tevent_req *subreq)
 164 {
 165         struct tevent_req *req = tevent_req_callback_data(
 166                 subreq, struct tevent_req);
 167         struct wb_sids2xids_state *state = tevent_req_data(
 168                 req, struct wb_sids2xids_state);
 169         struct lsa_RefDomainList *domains = NULL;
 170         struct lsa_TransNameArray *names = NULL;
 171         struct dcerpc_binding_handle *child_binding_handle = NULL;
 172         NTSTATUS status;
 173         uint32_t i;
 174
 175         status = wb_lookupsids_recv(subreq, state, &domains, &names);
 176         TALLOC_FREE(subreq);
 177         if (tevent_req_nterror(req, status)) {
 178                 return;
 179         }
 180
 181         state->ids.num_ids = state->num_non_cached;
 182         state->ids.ids = talloc_array(state, struct wbint_TransID,
 183                                       state->num_non_cached);
 184         if (tevent_req_nomem(state->ids.ids, req)) {
 185                 return;
 186         }
 187
 188         for (i=0; i<state->num_non_cached; i++) {
 189                 const struct dom_sid *sid = &state->non_cached[i];
 190                 struct dom_sid dom_sid;
 191                 struct lsa_TranslatedName *n = &names->names[i];
 192                 struct wbint_TransID *t = &state->ids.ids[i];
 193                 int domain_index;
 194                 const char *domain_name = NULL;
 195
 196                 if (n->sid_index != UINT32_MAX) {
 197                         const struct lsa_DomainInfo *info;
 198                         bool match;
 199
 200                         info = &domains->domains[n->sid_index];
 201                         match = dom_sid_in_domain(info->sid, sid);
 202                         if (match) {
 203                                 domain_name = info->name.string;
 204                         }
 205                 }
 206                 if (domain_name == NULL) {
 207                         struct winbindd_domain *wb_domain = NULL;
 208
 209                         /*
 210                          * This is needed to handle Samba DCs
 211                          * which always return sid_index == UINT32_MAX for
 212                          * unknown sids.
 213                          */
 214                         wb_domain = find_domain_from_sid_noinit(sid);
 215                         if (wb_domain != NULL) {
 216                                 domain_name = wb_domain->name;
 217                         }
 218                 }
 219                 if (domain_name == NULL) {
 220                         domain_name = "";
 221                 }
 222
 223                 sid_copy(&dom_sid, sid);
 224                 sid_split_rid(&dom_sid, &t->rid);
 225                 t->type = lsa_SidType_to_id_type(n->sid_type);
 226                 domain_index = init_lsa_ref_domain_list(
 227                         state, &state->idmap_doms, domain_name, &dom_sid);
 228                 if (domain_index == -1) {
 229                         tevent_req_oom(req);
 230                         return;
 231                 }
 232                 t->domain_index = domain_index;
 233
 234                 t->xid.id = UINT32_MAX;
 235                 t->xid.type = t->type;
 236         }
 237
 238         TALLOC_FREE(names);
 239         TALLOC_FREE(domains);
 240
 241         child_binding_handle = idmap_child_handle();
 242
 243         state->dom_ids = wb_sids2xids_extract_for_domain_index(
 244                 state, &state->ids, state->dom_index);
 245         if (tevent_req_nomem(state->dom_ids, req)) {
 246                 return;
 247         }
 248
 249         state->idmap_dom = (struct lsa_RefDomainList) {
 250                 .count = 1,
 251                 .domains = &state->idmap_doms.domains[state->dom_index],
 252                 .max_size = 1
 253         };
 254
 255         subreq = dcerpc_wbint_Sids2UnixIDs_send(
 256                 state, state->ev, child_binding_handle, &state->idmap_dom,
 257                 state->dom_ids);
 258         if (tevent_req_nomem(subreq, req)) {
 259                 return;
 260         }
 261         tevent_req_set_callback(subreq, wb_sids2xids_done, req);
 262 }
 263
 264 static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type)
 265 {
 266         enum id_type type;
 267
 268         switch(sid_type) {
 269         case SID_NAME_COMPUTER:
 270         case SID_NAME_USER:
 271                 type = ID_TYPE_UID;
 272                 break;
 273         case SID_NAME_DOM_GRP:
 274         case SID_NAME_ALIAS:
 275         case SID_NAME_WKN_GRP:
 276                 type = ID_TYPE_GID;
 277                 break;
 278         default:
 279                 type = ID_TYPE_NOT_SPECIFIED;
 280                 break;
 281         }
 282
 283         return type;
 284 }
 285
 286 static void wb_sids2xids_done(struct tevent_req *subreq)
 287 {
 288         struct tevent_req *req = tevent_req_callback_data(
 289                 subreq, struct tevent_req);
 290         struct wb_sids2xids_state *state = tevent_req_data(
 291                 req, struct wb_sids2xids_state);
 292         NTSTATUS status, result;
 293         struct winbindd_child *child;
 294
 295         struct wbint_TransIDArray *src, *dst;
 296         uint32_t i, src_idx;
 297
 298         status = dcerpc_wbint_Sids2UnixIDs_recv(subreq, state, &result);
 299         TALLOC_FREE(subreq);
 300
 301         if (tevent_req_nterror(req, status)) {
 302                 return;
 303         }
 304
 305         if (NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) &&
 306             !state->tried_dclookup) {
 307
 308                 struct lsa_DomainInfo *d;
 309
 310                 d = &state->idmap_doms.domains[state->dom_index];
 311
 312                 subreq = wb_dsgetdcname_send(
 313                         state, state->ev, d->name.string, NULL, NULL,
 314                         DS_RETURN_DNS_NAME);
 315                 if (tevent_req_nomem(subreq, req)) {
 316                         return;
 317                 }
 318                 tevent_req_set_callback(subreq, wb_sids2xids_gotdc, req);
 319                 return;
 320         }
 321
 322         src = state->dom_ids;
 323         src_idx = 0;
 324         dst = &state->ids;
 325
 326         if (any_nt_status_not_ok(status, result, &status)) {
 327                 DBG_DEBUG("status=%s, result=%s\n", nt_errstr(status),
 328                           nt_errstr(result));
 329
 330                 /*
 331                  * All we can do here is to report "not mapped"
 332                  */
 333                 for (i=0; i<src->num_ids; i++) {
 334                         src->ids[i].xid.type = ID_TYPE_NOT_SPECIFIED;
 335                 }
 336         }
 337
 338         for (i=0; i<dst->num_ids; i++) {
 339                 if (dst->ids[i].domain_index == state->dom_index) {
 340                         dst->ids[i].type = src->ids[src_idx].type;
 341                         dst->ids[i].xid  = src->ids[src_idx].xid;
 342                         src_idx += 1;
 343                 }
 344         }
 345
 346         TALLOC_FREE(state->dom_ids);
 347
 348         state->dom_index += 1;
 349         state->tried_dclookup = false;
 350
 351         if (state->dom_index == state->idmap_doms.count) {
 352                 tevent_req_done(req);
 353                 return;
 354         }
 355
 356         child = idmap_child();
 357
 358         state->dom_ids = wb_sids2xids_extract_for_domain_index(
 359                 state, &state->ids, state->dom_index);
 360         if (tevent_req_nomem(state->dom_ids, req)) {
 361                 return;
 362         }
 363
 364         state->idmap_dom = (struct lsa_RefDomainList) {
 365                 .count = 1,
 366                 .domains = &state->idmap_doms.domains[state->dom_index],
 367                 .max_size = 1
 368         };
 369
 370         subreq = dcerpc_wbint_Sids2UnixIDs_send(
 371                 state, state->ev, child->binding_handle, &state->idmap_dom,
 372                 state->dom_ids);
 373         if (tevent_req_nomem(subreq, req)) {
 374                 return;
 375         }
 376         tevent_req_set_callback(subreq, wb_sids2xids_done, req);
 377 }
 378
 379 static void wb_sids2xids_gotdc(struct tevent_req *subreq)
 380 {
 381         struct tevent_req *req = tevent_req_callback_data(
 382                 subreq, struct tevent_req);
 383         struct wb_sids2xids_state *state = tevent_req_data(
 384                 req, struct wb_sids2xids_state);
 385         struct winbindd_child *child = idmap_child();
 386         struct netr_DsRGetDCNameInfo *dcinfo;
 387         NTSTATUS status;
 388
 389         status = wb_dsgetdcname_recv(subreq, state, &dcinfo);
 390         TALLOC_FREE(subreq);
 391         if (tevent_req_nterror(req, status)) {
 392                 return;
 393         }
 394
 395         state->tried_dclookup = true;
 396
 397         {
 398                 struct lsa_DomainInfo *d =
 399                         &state->idmap_doms.domains[state->dom_index];
 400                 const char *dom_name = d->name.string;
 401
 402                 status = wb_dsgetdcname_gencache_set(dom_name, dcinfo);
 403                 if (tevent_req_nterror(req, status)) {
 404                         return;
 405                 }
 406         }
 407
 408         subreq = dcerpc_wbint_Sids2UnixIDs_send(
 409                 state, state->ev, child->binding_handle, &state->idmap_dom,
 410                 state->dom_ids);
 411         if (tevent_req_nomem(subreq, req)) {
 412                 return;
 413         }
 414         tevent_req_set_callback(subreq, wb_sids2xids_done, req);
 415 }
 416
 417 NTSTATUS wb_sids2xids_recv(struct tevent_req *req,
 418                            struct unixid xids[], uint32_t num_xids)
 419 {
 420         struct wb_sids2xids_state *state = tevent_req_data(
 421                 req, struct wb_sids2xids_state);
 422         NTSTATUS status;
 423         uint32_t i, num_non_cached;
 424
 425         if (tevent_req_is_nterror(req, &status)) {
 426                 DEBUG(5, ("wb_sids_to_xids failed: %s\n", nt_errstr(status)));
 427                 return status;
 428         }
 429
 430         if (num_xids != state->num_sids) {
 431                 DEBUG(1, ("%s: Have %u xids, caller wants %u\n", __func__,
 432                           (unsigned)state->num_sids, num_xids));
 433                 return NT_STATUS_INTERNAL_ERROR;
 434         }
 435
 436         num_non_cached = 0;
 437
 438         for (i=0; i<state->num_sids; i++) {
 439                 struct unixid xid;
 440
 441                 xid.id = UINT32_MAX;
 442
 443                 if (state->cached[i].sid != NULL) {
 444                         xid = state->cached[i].xid;
 445                 } else {
 446                         xid = state->ids.ids[num_non_cached].xid;
 447
 448                         idmap_cache_set_sid2unixid(
 449                                 &state->non_cached[num_non_cached],
 450                                 &xid);
 451
 452                         num_non_cached += 1;
 453                 }
 454
 455                 xids[i] = xid;
 456         }
 457
 458         return NT_STATUS_OK;
 459 }
 460
 461 static struct wbint_TransIDArray *wb_sids2xids_extract_for_domain_index(
 462         TALLOC_CTX *mem_ctx, const struct wbint_TransIDArray *src,
 463         uint32_t domain_index)
 464 {
 465         struct wbint_TransIDArray *ret;
 466         uint32_t i;
 467
 468         ret = talloc_zero(mem_ctx, struct wbint_TransIDArray);
 469         if (ret == NULL) {
 470                 return NULL;
 471         }
 472         ret->ids = talloc_array(ret, struct wbint_TransID, src->num_ids);
 473         if (ret->ids == NULL) {
 474                 TALLOC_FREE(ret);
 475                 return NULL;
 476         }
 477
 478         for (i=0; i<src->num_ids; i++) {
 479                 if (src->ids[i].domain_index == domain_index) {
 480                         ret->ids[ret->num_ids] = src->ids[i];
 481                         ret->ids[ret->num_ids].domain_index = 0;
 482                         ret->num_ids += 1;
 483                 }
 484         }
 485
 486         return ret;
 487 }