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
 112                 DEBUG(10, ("SID %d: %s\n", (int)i,
 113                            sid_string_dbg(&state->sids[i])));
 114
 115                 if (wb_sids2xids_in_cache(&state->sids[i], &state->cached[i])) {
 116                         continue;
 117                 }
 118                 sid_copy(&state->non_cached[state->num_non_cached],
 119                          &state->sids[i]);
 120                 state->num_non_cached += 1;
 121         }
 122
 123         if (state->num_non_cached == 0) {
 124                 tevent_req_done(req);
 125                 return tevent_req_post(req, ev);
 126         }
 127
 128         subreq = wb_lookupsids_send(state, ev, state->non_cached,
 129                                     state->num_non_cached);
 130         if (tevent_req_nomem(subreq, req)) {
 131                 return tevent_req_post(req, ev);
 132         }
 133         tevent_req_set_callback(subreq, wb_sids2xids_lookupsids_done, req);
 134         return req;
 135 }
 136
 137 static bool wb_sids2xids_in_cache(struct dom_sid *sid, struct id_map *map)
 138 {
 139         struct unixid id;
 140         bool expired;
 141
 142         if (!winbindd_use_idmap_cache()) {
 143                 return false;
 144         }
 145         if (idmap_cache_find_sid2unixid(sid, &id, &expired)) {
 146                 if (expired && is_domain_online(find_our_domain())) {
 147                         return false;
 148                 }
 149                 map->sid = sid;
 150                 map->xid = id;
 151                 map->status = ID_MAPPED;
 152                 return true;
 153         }
 154         return false;
 155 }
 156
 157 static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type);
 158 static struct wbint_TransIDArray *wb_sids2xids_extract_for_domain_index(
 159         TALLOC_CTX *mem_ctx, const struct wbint_TransIDArray *src,
 160         uint32_t domain_index);
 161
 162 static void wb_sids2xids_lookupsids_done(struct tevent_req *subreq)
 163 {
 164         struct tevent_req *req = tevent_req_callback_data(
 165                 subreq, struct tevent_req);
 166         struct wb_sids2xids_state *state = tevent_req_data(
 167                 req, struct wb_sids2xids_state);
 168         struct lsa_RefDomainList *domains = NULL;
 169         struct lsa_TransNameArray *names = NULL;
 170         struct dcerpc_binding_handle *child_binding_handle = NULL;
 171         NTSTATUS status;
 172         int i;
 173
 174         status = wb_lookupsids_recv(subreq, state, &domains, &names);
 175         TALLOC_FREE(subreq);
 176         if (tevent_req_nterror(req, status)) {
 177                 return;
 178         }
 179
 180         state->ids.num_ids = state->num_non_cached;
 181         state->ids.ids = talloc_array(state, struct wbint_TransID,
 182                                       state->num_non_cached);
 183         if (tevent_req_nomem(state->ids.ids, req)) {
 184                 return;
 185         }
 186
 187         for (i=0; i<state->num_non_cached; i++) {
 188                 const struct dom_sid *sid = &state->non_cached[i];
 189                 struct dom_sid dom_sid;
 190                 struct lsa_TranslatedName *n = &names->names[i];
 191                 struct wbint_TransID *t = &state->ids.ids[i];
 192                 int domain_index;
 193                 const char *domain_name = NULL;
 194
 195                 if (n->sid_index != UINT32_MAX) {
 196                         const struct lsa_DomainInfo *info;
 197                         bool match;
 198
 199                         info = &domains->domains[n->sid_index];
 200                         match = dom_sid_in_domain(info->sid, sid);
 201                         if (match) {
 202                                 domain_name = info->name.string;
 203                         }
 204                 }
 205                 if (domain_name == NULL) {
 206                         struct winbindd_domain *wb_domain = NULL;
 207
 208                         /*
 209                          * This is needed to handle Samba DCs
 210                          * which always return sid_index == UINT32_MAX for
 211                          * unknown sids.
 212                          */
 213                         wb_domain = find_domain_from_sid_noinit(sid);
 214                         if (wb_domain != NULL) {
 215                                 domain_name = wb_domain->name;
 216                         }
 217                 }
 218                 if (domain_name == NULL) {
 219                         domain_name = "";
 220                 }
 221
 222                 sid_copy(&dom_sid, sid);
 223                 sid_split_rid(&dom_sid, &t->rid);
 224                 t->type = lsa_SidType_to_id_type(n->sid_type);
 225                 domain_index = init_lsa_ref_domain_list(
 226                         state, &state->idmap_doms, domain_name, &dom_sid);
 227                 if (domain_index == -1) {
 228                         tevent_req_oom(req);
 229                         return;
 230                 }
 231                 t->domain_index = domain_index;
 232
 233                 t->xid.id = UINT32_MAX;
 234                 t->xid.type = t->type;
 235         }
 236
 237         TALLOC_FREE(names);
 238         TALLOC_FREE(domains);
 239
 240         child_binding_handle = idmap_child_handle();
 241
 242         state->dom_ids = wb_sids2xids_extract_for_domain_index(
 243                 state, &state->ids, state->dom_index);
 244         if (tevent_req_nomem(state->dom_ids, req)) {
 245                 return;
 246         }
 247
 248         state->idmap_dom = (struct lsa_RefDomainList) {
 249                 .count = 1,
 250                 .domains = &state->idmap_doms.domains[state->dom_index],
 251                 .max_size = 1
 252         };
 253
 254         subreq = dcerpc_wbint_Sids2UnixIDs_send(
 255                 state, state->ev, child_binding_handle, &state->idmap_dom,
 256                 state->dom_ids);
 257         if (tevent_req_nomem(subreq, req)) {
 258                 return;
 259         }
 260         tevent_req_set_callback(subreq, wb_sids2xids_done, req);
 261 }
 262
 263 static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type)
 264 {
 265         enum id_type type;
 266
 267         switch(sid_type) {
 268         case SID_NAME_COMPUTER:
 269         case SID_NAME_USER:
 270                 type = ID_TYPE_UID;
 271                 break;
 272         case SID_NAME_DOM_GRP:
 273         case SID_NAME_ALIAS:
 274         case SID_NAME_WKN_GRP:
 275                 type = ID_TYPE_GID;
 276                 break;
 277         default:
 278                 type = ID_TYPE_NOT_SPECIFIED;
 279                 break;
 280         }
 281
 282         return type;
 283 }
 284
 285 static void wb_sids2xids_done(struct tevent_req *subreq)
 286 {
 287         struct tevent_req *req = tevent_req_callback_data(
 288                 subreq, struct tevent_req);
 289         struct wb_sids2xids_state *state = tevent_req_data(
 290                 req, struct wb_sids2xids_state);
 291         NTSTATUS status, result;
 292         struct winbindd_child *child;
 293
 294         struct wbint_TransIDArray *src, *dst;
 295         uint32_t i, src_idx;
 296
 297         status = dcerpc_wbint_Sids2UnixIDs_recv(subreq, state, &result);
 298         TALLOC_FREE(subreq);
 299
 300         if (tevent_req_nterror(req, status)) {
 301                 return;
 302         }
 303
 304         if (NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) &&
 305             !state->tried_dclookup) {
 306
 307                 struct lsa_DomainInfo *d;
 308
 309                 d = &state->idmap_doms.domains[state->dom_index];
 310
 311                 subreq = wb_dsgetdcname_send(
 312                         state, state->ev, d->name.string, NULL, NULL,
 313                         DS_RETURN_DNS_NAME);
 314                 if (tevent_req_nomem(subreq, req)) {
 315                         return;
 316                 }
 317                 tevent_req_set_callback(subreq, wb_sids2xids_gotdc, req);
 318                 return;
 319         }
 320
 321         src = state->dom_ids;
 322         src_idx = 0;
 323         dst = &state->ids;
 324
 325         if (any_nt_status_not_ok(status, result, &status)) {
 326                 DBG_DEBUG("status=%s, result=%s\n", nt_errstr(status),
 327                           nt_errstr(result));
 328
 329                 /*
 330                  * All we can do here is to report "not mapped"
 331                  */
 332                 for (i=0; i<src->num_ids; i++) {
 333                         src->ids[i].xid.type = ID_TYPE_NOT_SPECIFIED;
 334                 }
 335         }
 336
 337         for (i=0; i<dst->num_ids; i++) {
 338                 if (dst->ids[i].domain_index == state->dom_index) {
 339                         dst->ids[i].type = src->ids[src_idx].type;
 340                         dst->ids[i].xid  = src->ids[src_idx].xid;
 341                         src_idx += 1;
 342                 }
 343         }
 344
 345         TALLOC_FREE(state->dom_ids);
 346
 347         state->dom_index += 1;
 348         state->tried_dclookup = false;
 349
 350         if (state->dom_index == state->idmap_doms.count) {
 351                 tevent_req_done(req);
 352                 return;
 353         }
 354
 355         child = idmap_child();
 356
 357         state->dom_ids = wb_sids2xids_extract_for_domain_index(
 358                 state, &state->ids, state->dom_index);
 359         if (tevent_req_nomem(state->dom_ids, req)) {
 360                 return;
 361         }
 362
 363         state->idmap_dom = (struct lsa_RefDomainList) {
 364                 .count = 1,
 365                 .domains = &state->idmap_doms.domains[state->dom_index],
 366                 .max_size = 1
 367         };
 368
 369         subreq = dcerpc_wbint_Sids2UnixIDs_send(
 370                 state, state->ev, child->binding_handle, &state->idmap_dom,
 371                 state->dom_ids);
 372         if (tevent_req_nomem(subreq, req)) {
 373                 return;
 374         }
 375         tevent_req_set_callback(subreq, wb_sids2xids_done, req);
 376 }
 377
 378 static void wb_sids2xids_gotdc(struct tevent_req *subreq)
 379 {
 380         struct tevent_req *req = tevent_req_callback_data(
 381                 subreq, struct tevent_req);
 382         struct wb_sids2xids_state *state = tevent_req_data(
 383                 req, struct wb_sids2xids_state);
 384         struct winbindd_child *child = idmap_child();
 385         struct netr_DsRGetDCNameInfo *dcinfo;
 386         NTSTATUS status;
 387
 388         status = wb_dsgetdcname_recv(subreq, state, &dcinfo);
 389         TALLOC_FREE(subreq);
 390         if (tevent_req_nterror(req, status)) {
 391                 return;
 392         }
 393
 394         state->tried_dclookup = true;
 395
 396         {
 397                 struct lsa_DomainInfo *d =
 398                         &state->idmap_doms.domains[state->dom_index];
 399                 const char *dom_name = d->name.string;
 400
 401                 status = wb_dsgetdcname_gencache_set(dom_name, dcinfo);
 402                 if (tevent_req_nterror(req, status)) {
 403                         return;
 404                 }
 405         }
 406
 407         subreq = dcerpc_wbint_Sids2UnixIDs_send(
 408                 state, state->ev, child->binding_handle, &state->idmap_dom,
 409                 state->dom_ids);
 410         if (tevent_req_nomem(subreq, req)) {
 411                 return;
 412         }
 413         tevent_req_set_callback(subreq, wb_sids2xids_done, req);
 414 }
 415
 416 NTSTATUS wb_sids2xids_recv(struct tevent_req *req,
 417                            struct unixid xids[], uint32_t num_xids)
 418 {
 419         struct wb_sids2xids_state *state = tevent_req_data(
 420                 req, struct wb_sids2xids_state);
 421         NTSTATUS status;
 422         uint32_t i, num_non_cached;
 423
 424         if (tevent_req_is_nterror(req, &status)) {
 425                 DEBUG(5, ("wb_sids_to_xids failed: %s\n", nt_errstr(status)));
 426                 return status;
 427         }
 428
 429         if (num_xids != state->num_sids) {
 430                 DEBUG(1, ("%s: Have %u xids, caller wants %u\n", __func__,
 431                           (unsigned)state->num_sids, num_xids));
 432                 return NT_STATUS_INTERNAL_ERROR;
 433         }
 434
 435         num_non_cached = 0;
 436
 437         for (i=0; i<state->num_sids; i++) {
 438                 struct unixid xid;
 439
 440                 xid.id = UINT32_MAX;
 441
 442                 if (state->cached[i].sid != NULL) {
 443                         xid = state->cached[i].xid;
 444                 } else {
 445                         xid = state->ids.ids[num_non_cached].xid;
 446
 447                         idmap_cache_set_sid2unixid(
 448                                 &state->non_cached[num_non_cached],
 449                                 &xid);
 450
 451                         num_non_cached += 1;
 452                 }
 453
 454                 xids[i] = xid;
 455         }
 456
 457         return NT_STATUS_OK;
 458 }
 459
 460 static struct wbint_TransIDArray *wb_sids2xids_extract_for_domain_index(
 461         TALLOC_CTX *mem_ctx, const struct wbint_TransIDArray *src,
 462         uint32_t domain_index)
 463 {
 464         struct wbint_TransIDArray *ret;
 465         uint32_t i;
 466
 467         ret = talloc_zero(mem_ctx, struct wbint_TransIDArray);
 468         if (ret == NULL) {
 469                 return NULL;
 470         }
 471         ret->ids = talloc_array(ret, struct wbint_TransID, src->num_ids);
 472         if (ret->ids == NULL) {
 473                 TALLOC_FREE(ret);
 474                 return NULL;
 475         }
 476
 477         for (i=0; i<src->num_ids; i++) {
 478                 if (src->ids[i].domain_index == domain_index) {
 479                         ret->ids[ret->num_ids] = src->ids[i];
 480                         ret->ids[ret->num_ids].domain_index = 0;
 481                         ret->num_ids += 1;
 482                 }
 483         }
 484
 485         return ret;
 486 }