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 that 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 winbindd_child *child;
 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                 struct dom_sid dom_sid;
 189                 struct lsa_DomainInfo *info;
 190                 struct lsa_TranslatedName *n = &names->names[i];
 191                 struct wbint_TransID *t = &state->ids.ids[i];
 192                 int domain_index;
 193
 194                 sid_copy(&dom_sid, &state->non_cached[i]);
 195                 sid_split_rid(&dom_sid, &t->rid);
 196
 197                 info = &domains->domains[n->sid_index];
 198                 t->type = lsa_SidType_to_id_type(n->sid_type);
 199
 200                 domain_index = init_lsa_ref_domain_list(
 201                         state, &state->idmap_doms, info->name.string, &dom_sid);
 202                 if (domain_index == -1) {
 203                         tevent_req_oom(req);
 204                         return;
 205                 }
 206                 t->domain_index = domain_index;
 207
 208                 t->xid.id = UINT32_MAX;
 209                 t->xid.type = t->type;
 210         }
 211
 212         TALLOC_FREE(names);
 213         TALLOC_FREE(domains);
 214
 215         child = idmap_child();
 216
 217         state->dom_ids = wb_sids2xids_extract_for_domain_index(
 218                 state, &state->ids, state->dom_index);
 219         if (tevent_req_nomem(state->dom_ids, req)) {
 220                 return;
 221         }
 222
 223         state->idmap_dom = (struct lsa_RefDomainList) {
 224                 .count = 1,
 225                 .domains = &state->idmap_doms.domains[state->dom_index],
 226                 .max_size = 1
 227         };
 228
 229         subreq = dcerpc_wbint_Sids2UnixIDs_send(
 230                 state, state->ev, child->binding_handle, &state->idmap_dom,
 231                 state->dom_ids);
 232         if (tevent_req_nomem(subreq, req)) {
 233                 return;
 234         }
 235         tevent_req_set_callback(subreq, wb_sids2xids_done, req);
 236 }
 237
 238 static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type)
 239 {
 240         enum id_type type;
 241
 242         switch(sid_type) {
 243         case SID_NAME_COMPUTER:
 244         case SID_NAME_USER:
 245                 type = ID_TYPE_UID;
 246                 break;
 247         case SID_NAME_DOM_GRP:
 248         case SID_NAME_ALIAS:
 249         case SID_NAME_WKN_GRP:
 250                 type = ID_TYPE_GID;
 251                 break;
 252         default:
 253                 type = ID_TYPE_NOT_SPECIFIED;
 254                 break;
 255         }
 256
 257         return type;
 258 }
 259
 260 static void wb_sids2xids_done(struct tevent_req *subreq)
 261 {
 262         struct tevent_req *req = tevent_req_callback_data(
 263                 subreq, struct tevent_req);
 264         struct wb_sids2xids_state *state = tevent_req_data(
 265                 req, struct wb_sids2xids_state);
 266         NTSTATUS status, result;
 267         struct winbindd_child *child;
 268
 269         struct wbint_TransIDArray *src, *dst;
 270         uint32_t i, src_idx;
 271
 272         status = dcerpc_wbint_Sids2UnixIDs_recv(subreq, state, &result);
 273         TALLOC_FREE(subreq);
 274
 275         if (tevent_req_nterror(req, status)) {
 276                 return;
 277         }
 278
 279         if (NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) &&
 280             !state->tried_dclookup) {
 281
 282                 struct lsa_DomainInfo *d;
 283
 284                 d = &state->idmap_doms.domains[state->dom_index];
 285
 286                 subreq = wb_dsgetdcname_send(
 287                         state, state->ev, d->name.string, NULL, NULL,
 288                         DS_RETURN_DNS_NAME);
 289                 if (tevent_req_nomem(subreq, req)) {
 290                         return;
 291                 }
 292                 tevent_req_set_callback(subreq, wb_sids2xids_gotdc, req);
 293                 return;
 294         }
 295
 296         src = state->dom_ids;
 297         src_idx = 0;
 298         dst = &state->ids;
 299
 300         if (any_nt_status_not_ok(status, result, &status)) {
 301                 DBG_DEBUG("status=%s, result=%s\n", nt_errstr(status),
 302                           nt_errstr(result));
 303
 304                 /*
 305                  * All we can do here is to report "not mapped"
 306                  */
 307                 for (i=0; i<src->num_ids; i++) {
 308                         src->ids[i].type = ID_TYPE_NOT_SPECIFIED;
 309                 }
 310         }
 311
 312         for (i=0; i<dst->num_ids; i++) {
 313                 if (dst->ids[i].domain_index == state->dom_index) {
 314                         dst->ids[i].type = src->ids[src_idx].type;
 315                         dst->ids[i].xid  = src->ids[src_idx].xid;
 316                         src_idx += 1;
 317                 }
 318         }
 319
 320         TALLOC_FREE(state->dom_ids);
 321
 322         state->dom_index += 1;
 323         state->tried_dclookup = false;
 324
 325         if (state->dom_index == state->idmap_doms.count) {
 326                 tevent_req_done(req);
 327                 return;
 328         }
 329
 330         child = idmap_child();
 331
 332         state->dom_ids = wb_sids2xids_extract_for_domain_index(
 333                 state, &state->ids, state->dom_index);
 334         if (tevent_req_nomem(state->dom_ids, req)) {
 335                 return;
 336         }
 337
 338         state->idmap_dom = (struct lsa_RefDomainList) {
 339                 .count = 1,
 340                 .domains = &state->idmap_doms.domains[state->dom_index],
 341                 .max_size = 1
 342         };
 343
 344         subreq = dcerpc_wbint_Sids2UnixIDs_send(
 345                 state, state->ev, child->binding_handle, &state->idmap_dom,
 346                 state->dom_ids);
 347         if (tevent_req_nomem(subreq, req)) {
 348                 return;
 349         }
 350         tevent_req_set_callback(subreq, wb_sids2xids_done, req);
 351 }
 352
 353 static void wb_sids2xids_gotdc(struct tevent_req *subreq)
 354 {
 355         struct tevent_req *req = tevent_req_callback_data(
 356                 subreq, struct tevent_req);
 357         struct wb_sids2xids_state *state = tevent_req_data(
 358                 req, struct wb_sids2xids_state);
 359         struct winbindd_child *child = idmap_child();
 360         struct netr_DsRGetDCNameInfo *dcinfo;
 361         NTSTATUS status;
 362
 363         status = wb_dsgetdcname_recv(subreq, state, &dcinfo);
 364         TALLOC_FREE(subreq);
 365         if (tevent_req_nterror(req, status)) {
 366                 return;
 367         }
 368
 369         state->tried_dclookup = true;
 370
 371         {
 372                 struct lsa_DomainInfo *d =
 373                         &state->idmap_doms.domains[state->dom_index];
 374                 const char *dom_name = d->name.string;
 375
 376                 status = wb_dsgetdcname_gencache_set(dom_name, dcinfo);
 377                 if (tevent_req_nterror(req, status)) {
 378                         return;
 379                 }
 380         }
 381
 382         subreq = dcerpc_wbint_Sids2UnixIDs_send(
 383                 state, state->ev, child->binding_handle, &state->idmap_dom,
 384                 state->dom_ids);
 385         if (tevent_req_nomem(subreq, req)) {
 386                 return;
 387         }
 388         tevent_req_set_callback(subreq, wb_sids2xids_done, req);
 389 }
 390
 391 NTSTATUS wb_sids2xids_recv(struct tevent_req *req,
 392                            struct unixid xids[], uint32_t num_xids)
 393 {
 394         struct wb_sids2xids_state *state = tevent_req_data(
 395                 req, struct wb_sids2xids_state);
 396         NTSTATUS status;
 397         uint32_t i, num_non_cached;
 398
 399         if (tevent_req_is_nterror(req, &status)) {
 400                 DEBUG(5, ("wb_sids_to_xids failed: %s\n", nt_errstr(status)));
 401                 return status;
 402         }
 403
 404         if (num_xids != state->num_sids) {
 405                 DEBUG(1, ("%s: Have %u xids, caller wants %u\n", __func__,
 406                           (unsigned)state->num_sids, num_xids));
 407                 return NT_STATUS_INTERNAL_ERROR;
 408         }
 409
 410         num_non_cached = 0;
 411
 412         for (i=0; i<state->num_sids; i++) {
 413                 struct unixid xid;
 414
 415                 xid.id = UINT32_MAX;
 416
 417                 if (state->cached[i].sid != NULL) {
 418                         xid = state->cached[i].xid;
 419                 } else {
 420                         xid = state->ids.ids[num_non_cached].xid;
 421
 422                         idmap_cache_set_sid2unixid(
 423                                 &state->non_cached[num_non_cached],
 424                                 &xid);
 425
 426                         num_non_cached += 1;
 427                 }
 428
 429                 xids[i] = xid;
 430         }
 431
 432         return NT_STATUS_OK;
 433 }
 434
 435 static struct wbint_TransIDArray *wb_sids2xids_extract_for_domain_index(
 436         TALLOC_CTX *mem_ctx, const struct wbint_TransIDArray *src,
 437         uint32_t domain_index)
 438 {
 439         struct wbint_TransIDArray *ret;
 440         uint32_t i;
 441
 442         ret = talloc_zero(mem_ctx, struct wbint_TransIDArray);
 443         if (ret == NULL) {
 444                 return NULL;
 445         }
 446         ret->ids = talloc_array(ret, struct wbint_TransID, src->num_ids);
 447         if (ret->ids == NULL) {
 448                 TALLOC_FREE(ret);
 449                 return NULL;
 450         }
 451
 452         for (i=0; i<src->num_ids; i++) {
 453                 if (src->ids[i].domain_index == domain_index) {
 454                         ret->ids[ret->num_ids] = src->ids[i];
 455                         ret->ids[ret->num_ids].domain_index = 0;
 456                         ret->num_ids += 1;
 457                 }
 458         }
 459
 460         return ret;
 461 }