source3/winbindd/wb_lookupsids.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    async lookupsids
   4    Copyright (C) Volker Lendecke 2011
   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 "librpc/gen_ndr/ndr_wbint_c.h"
  23 #include "../libcli/security/security.h"
  24 #include "passdb/machine_sid.h"
  25
  26 struct wb_lookupsids_domain {
  27         struct dom_sid sid;
  28         struct winbindd_domain *domain;
  29
  30         /*
  31          * Array of sids to be passed into wbint_LookupSids. Preallocated with
  32          * num_sids.
  33          */
  34         struct lsa_SidArray sids;
  35
  36         /*
  37          * Indexes into wb_lookupsids_state->sids and thus
  38          * wb_lookupsids_state->res_names. Preallocated with num_sids.
  39          */
  40         uint32_t *sid_indexes;
  41 };
  42
  43 struct wb_translated_name {
  44         const char *domain_name;
  45         const char *name;
  46         enum lsa_SidType type;
  47 };
  48
  49 static struct wb_lookupsids_domain *wb_lookupsids_get_domain(
  50         const struct dom_sid *sid, TALLOC_CTX *mem_ctx,
  51         struct wb_lookupsids_domain **domains, uint32_t num_sids);
  52
  53 struct wb_lookupsids_state {
  54         struct tevent_context *ev;
  55
  56         /*
  57          * SIDs passed in
  58          */
  59         struct dom_sid *sids;
  60         uint32_t num_sids;
  61
  62         /*
  63          * The domains we're using for bulk lookup via wbint_LookupRids or
  64          * wbint_LookupSids. We expect very few domains, so we do a
  65          * talloc_realloc and rely on talloc_array_length.
  66          */
  67         struct wb_lookupsids_domain *domains;
  68         uint32_t domains_done;
  69
  70         /*
  71          * These SIDs are looked up individually via
  72          * wbint_LookupSid. Preallocated with num_sids.
  73          */
  74         uint32_t *single_sids;
  75         uint32_t num_single_sids;
  76         uint32_t single_sids_done;
  77
  78         /*
  79          * Intermediate store for wbint_LookupRids to passdb. These are
  80          * spliced into res_domains/res_names in wb_lookupsids_move_name.
  81          */
  82         struct wbint_RidArray rids;
  83         const char *domain_name;
  84         struct wbint_Principals rid_names;
  85
  86         /*
  87          * Intermediate results for wbint_LookupSids. These results are
  88          * spliced into res_domains/res_names in wb_lookupsids_move_name.
  89          */
  90         struct lsa_RefDomainList tmp_domains;
  91         struct lsa_TransNameArray tmp_names;
  92
  93         /*
  94          * Results
  95          */
  96         struct lsa_RefDomainList *res_domains;
  97         /*
  98          * Indexed as "sids" in this structure
  99          */
 100         struct lsa_TransNameArray *res_names;
 101 };
 102
 103 static bool wb_lookupsids_next(struct tevent_req *req,
 104                                struct wb_lookupsids_state *state);
 105 static void wb_lookupsids_single_done(struct tevent_req *subreq);
 106 static void wb_lookupsids_lookuprids_done(struct tevent_req *subreq);
 107 static void wb_lookupsids_done(struct tevent_req *subreq);
 108
 109 struct tevent_req *wb_lookupsids_send(TALLOC_CTX *mem_ctx,
 110                                       struct tevent_context *ev,
 111                                       struct dom_sid *sids,
 112                                       uint32_t num_sids)
 113 {
 114         struct tevent_req *req;
 115         struct wb_lookupsids_state *state;
 116         uint32_t i;
 117
 118         req = tevent_req_create(mem_ctx, &state, struct wb_lookupsids_state);
 119         if (req == NULL) {
 120                 return NULL;
 121         }
 122         state->ev = ev;
 123         state->sids = sids;
 124         state->num_sids = num_sids;
 125
 126         state->single_sids = talloc_array(state, uint32_t, num_sids);
 127         if (tevent_req_nomem(state->single_sids, req)) {
 128                 return tevent_req_post(req, ev);
 129         }
 130
 131         state->res_domains = talloc_zero(state, struct lsa_RefDomainList);
 132         if (tevent_req_nomem(state->res_domains, req)) {
 133                 return tevent_req_post(req, ev);
 134         }
 135         state->res_domains->domains = talloc_array(
 136                 state->res_domains, struct lsa_DomainInfo, num_sids);
 137         if (tevent_req_nomem(state->res_domains->domains, req)) {
 138                 return tevent_req_post(req, ev);
 139         }
 140
 141         state->res_names = talloc_zero(state, struct lsa_TransNameArray);
 142         if (tevent_req_nomem(state->res_names, req)) {
 143                 return tevent_req_post(req, ev);
 144         }
 145         state->res_names->names = talloc_array(
 146                 state->res_names, struct lsa_TranslatedName, num_sids);
 147         if (tevent_req_nomem(state->res_names->names, req)) {
 148                 return tevent_req_post(req, ev);
 149         }
 150
 151         if (num_sids == 0) {
 152                 tevent_req_done(req);
 153                 return tevent_req_post(req, ev);
 154         }
 155
 156         for (i=0; i<num_sids; i++) {
 157                 struct wb_lookupsids_domain *d;
 158
 159                 d = wb_lookupsids_get_domain(&sids[i], state, &state->domains,
 160                                              num_sids);
 161                 if (d != NULL) {
 162                         d->sids.sids[d->sids.num_sids].sid = &sids[i];
 163                         d->sid_indexes[d->sids.num_sids] = i;
 164                         d->sids.num_sids += 1;
 165                 } else {
 166                         state->single_sids[state->num_single_sids] = i;
 167                         state->num_single_sids += 1;
 168                 }
 169         }
 170
 171         if (!wb_lookupsids_next(req, state)) {
 172                 return tevent_req_post(req, ev);
 173         }
 174         return req;
 175 }
 176
 177 static bool wb_lookupsids_next(struct tevent_req *req,
 178                                struct wb_lookupsids_state *state)
 179 {
 180         struct tevent_req *subreq;
 181
 182         if (state->domains_done < talloc_array_length(state->domains)) {
 183                 struct wb_lookupsids_domain *d;
 184                 uint32_t i;
 185
 186                 d = &state->domains[state->domains_done];
 187
 188                 if (sid_check_is_our_sam(&d->sid)) {
 189                         state->rids.num_rids = d->sids.num_sids;
 190                         state->rids.rids = talloc_array(state, uint32_t,
 191                                                         state->rids.num_rids);
 192                         if (tevent_req_nomem(state->rids.rids, req)) {
 193                                 return false;
 194                         }
 195                         for (i=0; i<state->rids.num_rids; i++) {
 196                                 sid_peek_rid(d->sids.sids[i].sid,
 197                                              &state->rids.rids[i]);
 198                         }
 199                         subreq = dcerpc_wbint_LookupRids_send(
 200                                 state, state->ev, dom_child_handle(d->domain),
 201                                 &d->sid, &state->rids, &state->domain_name,
 202                                 &state->rid_names);
 203                         if (tevent_req_nomem(subreq, req)) {
 204                                 return false;
 205                         }
 206                         tevent_req_set_callback(
 207                                 subreq, wb_lookupsids_lookuprids_done, req);
 208                         return true;
 209                 }
 210
 211                 subreq = dcerpc_wbint_LookupSids_send(
 212                         state, state->ev, dom_child_handle(d->domain),
 213                         &d->sids, &state->tmp_domains,  &state->tmp_names);
 214                 if (tevent_req_nomem(subreq, req)) {
 215                         return false;
 216                 }
 217                 tevent_req_set_callback(subreq, wb_lookupsids_done, req);
 218                 return true;
 219         }
 220
 221         if (state->single_sids_done < state->num_single_sids) {
 222                 uint32_t sid_idx;
 223                 const struct dom_sid *sid;
 224
 225                 sid_idx = state->single_sids[state->single_sids_done];
 226                 sid = &state->sids[sid_idx];
 227
 228                 subreq = wb_lookupsid_send(state, state->ev, sid);
 229                 if (tevent_req_nomem(subreq, req)) {
 230                         return false;
 231                 }
 232                 tevent_req_set_callback(subreq, wb_lookupsids_single_done,
 233                                         req);
 234                 return true;
 235         }
 236
 237         tevent_req_done(req);
 238         return false;
 239 }
 240
 241 /*
 242  * Decide whether to do bulk lookupsids. We have optimizations for
 243  * passdb via lookuprids and to remote DCs via lookupsids.
 244  */
 245
 246 static bool wb_lookupsids_bulk(const struct dom_sid *sid)
 247 {
 248         if (sid->num_auths != 5) {
 249                 /*
 250                  * Only do "S-1-5-21-x-y-z-rid" domains via bulk
 251                  * lookup
 252                  */
 253                 DEBUG(10, ("No bulk setup for SID %s with %d subauths\n",
 254                            sid_string_dbg(sid), sid->num_auths));
 255                 return false;
 256         }
 257
 258         if (sid_check_is_in_our_sam(sid)) {
 259                 /*
 260                  * Passdb lookup via lookuprids
 261                  */
 262                 DEBUG(10, ("%s is in our domain\n", sid_string_tos(sid)));
 263                 return true;
 264         }
 265
 266         if ((lp_server_role() == ROLE_DOMAIN_PDC) ||
 267             (lp_server_role() == ROLE_DOMAIN_BDC)) {
 268                 /*
 269                  * Bulk lookups to trusted DCs
 270                  */
 271                 return (find_domain_from_sid_noinit(sid) != NULL);
 272         }
 273
 274         if (lp_server_role() != ROLE_DOMAIN_MEMBER) {
 275                 /*
 276                  * Don't do bulk lookups as standalone, the only bulk
 277                  * lookup left is for domain members.
 278                  */
 279                 return false;
 280         }
 281
 282         if (sid_check_is_in_unix_groups(sid) ||
 283             sid_check_is_unix_groups(sid) ||
 284             sid_check_is_in_unix_users(sid) ||
 285             sid_check_is_unix_users(sid) ||
 286             sid_check_is_in_builtin(sid) ||
 287             sid_check_is_builtin(sid)) {
 288                 /*
 289                  * These are locally done piece by piece anyway, no
 290                  * need for bulk optimizations.
 291                  */
 292                 return false;
 293         }
 294
 295         /*
 296          * All other SIDs are sent to the DC we're connected to as
 297          * member via a single lsa_lookupsids call.
 298          */
 299         return true;
 300 }
 301
 302 static struct wb_lookupsids_domain *wb_lookupsids_get_domain(
 303         const struct dom_sid *sid, TALLOC_CTX *mem_ctx,
 304         struct wb_lookupsids_domain **pdomains, uint32_t num_sids)
 305 {
 306         struct wb_lookupsids_domain *domains, *domain;
 307         struct winbindd_domain *wb_domain;
 308         uint32_t i, num_domains;
 309
 310         if (!wb_lookupsids_bulk(sid)) {
 311                 return NULL;
 312         }
 313
 314         domains = *pdomains;
 315         num_domains = talloc_array_length(domains);
 316
 317         for (i=0; i<num_domains; i++) {
 318                 if (dom_sid_compare_domain(sid, &domains[i].sid) == 0) {
 319                         return &domains[i];
 320                 }
 321         }
 322
 323         wb_domain = find_domain_from_sid_noinit(sid);
 324         if (wb_domain == NULL) {
 325                 return NULL;
 326         }
 327
 328         domains = talloc_realloc(
 329                 mem_ctx, domains, struct wb_lookupsids_domain, num_domains+1);
 330         if (domains == NULL) {
 331                 return NULL;
 332         }
 333         *pdomains = domains;
 334
 335         domain = &domains[num_domains];
 336         sid_copy(&domain->sid, sid);
 337         sid_split_rid(&domain->sid, NULL);
 338         domain->domain = wb_domain;
 339
 340         domain->sids.sids = talloc_array(domains, struct lsa_SidPtr, num_sids);
 341         if (domains->sids.sids == NULL) {
 342                 goto fail;
 343         }
 344         domain->sids.num_sids = 0;
 345
 346         domain->sid_indexes = talloc_array(domains, uint32_t, num_sids);
 347         if (domain->sid_indexes == NULL) {
 348                 TALLOC_FREE(domain->sids.sids);
 349                 goto fail;
 350         }
 351         return domain;
 352
 353 fail:
 354         /*
 355          * Realloc to the state it was in before
 356          */
 357         *pdomains = talloc_realloc(
 358                 mem_ctx, domains, struct wb_lookupsids_domain, num_domains);
 359         return NULL;
 360 }
 361
 362 static bool wb_lookupsids_find_dom_idx(struct lsa_DomainInfo *domain,
 363                                        struct lsa_RefDomainList *list,
 364                                        uint32_t *idx)
 365 {
 366         uint32_t i;
 367         struct lsa_DomainInfo *new_domain;
 368
 369         for (i=0; i<list->count; i++) {
 370                 if (dom_sid_equal(domain->sid, list->domains[i].sid)) {
 371                         *idx = i;
 372                         return true;
 373                 }
 374         }
 375
 376         new_domain = &list->domains[list->count];
 377
 378         new_domain->name.string = talloc_strdup(
 379                 list->domains, domain->name.string);
 380         if (new_domain->name.string == NULL) {
 381                 return false;
 382         }
 383
 384         new_domain->sid = dom_sid_dup(list->domains, domain->sid);
 385         if (new_domain->sid == NULL) {
 386                 return false;
 387         }
 388
 389         *idx = list->count;
 390         list->count += 1;
 391         return true;
 392 }
 393
 394 static bool wb_lookupsids_move_name(struct lsa_RefDomainList *src_domains,
 395                                     struct lsa_TranslatedName *src_name,
 396                                     struct lsa_RefDomainList *dst_domains,
 397                                     struct lsa_TransNameArray *dst_names,
 398                                     uint32_t dst_name_index)
 399 {
 400         struct lsa_TranslatedName *dst_name;
 401         struct lsa_DomainInfo *src_domain;
 402         uint32_t src_domain_index, dst_domain_index;
 403
 404         src_domain_index = src_name->sid_index;
 405         src_domain = &src_domains->domains[src_domain_index];
 406
 407         if (!wb_lookupsids_find_dom_idx(
 408                     src_domain, dst_domains, &dst_domain_index)) {
 409                 return false;
 410         }
 411
 412         dst_name = &dst_names->names[dst_name_index];
 413
 414         dst_name->sid_type = src_name->sid_type;
 415         dst_name->name.string = talloc_move(dst_names->names,
 416                                             &src_name->name.string);
 417         dst_name->sid_index = dst_domain_index;
 418         dst_names->count += 1;
 419
 420         return true;
 421 }
 422
 423 static void wb_lookupsids_done(struct tevent_req *subreq)
 424 {
 425         struct tevent_req *req = tevent_req_callback_data(
 426                 subreq, struct tevent_req);
 427         struct wb_lookupsids_state *state = tevent_req_data(
 428                 req, struct wb_lookupsids_state);
 429         struct wb_lookupsids_domain *d;
 430         uint32_t i;
 431         bool fallback = false;
 432
 433         NTSTATUS status, result;
 434
 435         status = dcerpc_wbint_LookupSids_recv(subreq, state, &result);
 436         TALLOC_FREE(subreq);
 437         if (tevent_req_nterror(req, status)) {
 438                 return;
 439         }
 440
 441         d = &state->domains[state->domains_done];
 442
 443         if (NT_STATUS_IS_ERR(result)) {
 444                 fallback = true;
 445         } else if (state->tmp_names.count != d->sids.num_sids) {
 446                 fallback = true;
 447         }
 448
 449         if (fallback) {
 450                 for (i=0; i < d->sids.num_sids; i++) {
 451                         uint32_t res_sid_index = d->sid_indexes[i];
 452
 453                         state->single_sids[state->num_single_sids] =
 454                                 res_sid_index;
 455                         state->num_single_sids += 1;
 456                 }
 457                 state->domains_done += 1;
 458                 wb_lookupsids_next(req, state);
 459                 return;
 460         }
 461
 462         /*
 463          * Look at the individual states in the translated names.
 464          */
 465
 466         for (i=0; i<state->tmp_names.count; i++) {
 467
 468                 uint32_t res_sid_index = d->sid_indexes[i];
 469
 470                 if (state->tmp_names.names[i].sid_type == SID_NAME_UNKNOWN) {
 471                         /*
 472                          * Make unknown SIDs go through
 473                          * wb_lookupsid. This retries the forest root.
 474                          */
 475                         state->single_sids[state->num_single_sids] =
 476                                 res_sid_index;
 477                         state->num_single_sids += 1;
 478                         continue;
 479                 }
 480                 if (!wb_lookupsids_move_name(
 481                             &state->tmp_domains, &state->tmp_names.names[i],
 482                             state->res_domains, state->res_names,
 483                             res_sid_index)) {
 484                         tevent_req_oom(req);
 485                         return;
 486                 }
 487         }
 488         state->domains_done += 1;
 489         wb_lookupsids_next(req, state);
 490 }
 491
 492 static void wb_lookupsids_single_done(struct tevent_req *subreq)
 493 {
 494         struct tevent_req *req = tevent_req_callback_data(
 495                 subreq, struct tevent_req);
 496         struct wb_lookupsids_state *state = tevent_req_data(
 497                 req, struct wb_lookupsids_state);
 498         const char *domain_name, *name;
 499         enum lsa_SidType type;
 500         uint32_t res_sid_index;
 501         uint32_t src_rid;
 502
 503         struct dom_sid src_domain_sid;
 504         struct lsa_DomainInfo src_domain;
 505         struct lsa_RefDomainList src_domains;
 506         struct lsa_TranslatedName src_name;
 507
 508         NTSTATUS status;
 509
 510         status = wb_lookupsid_recv(subreq, talloc_tos(), &type,
 511                                    &domain_name, &name);
 512         TALLOC_FREE(subreq);
 513         if (!NT_STATUS_IS_OK(status)) {
 514                 type = SID_NAME_UNKNOWN;
 515
 516                 domain_name = talloc_strdup(talloc_tos(), "");
 517                 if (tevent_req_nomem(domain_name, req)) {
 518                         return;
 519                 }
 520                 name = talloc_strdup(talloc_tos(), "");
 521                 if (tevent_req_nomem(name, req)) {
 522                         return;
 523                 }
 524         }
 525
 526         /*
 527          * Fake up structs for wb_lookupsids_move_name
 528          */
 529         res_sid_index = state->single_sids[state->single_sids_done];
 530
 531         sid_copy(&src_domain_sid, &state->sids[res_sid_index]);
 532         sid_split_rid(&src_domain_sid, &src_rid);
 533         src_domain.name.string = domain_name;
 534         src_domain.sid = &src_domain_sid;
 535
 536         src_domains.count = 1;
 537         src_domains.domains = &src_domain;
 538
 539         src_name.sid_type = type;
 540         src_name.name.string = name;
 541         src_name.sid_index = 0;
 542
 543         if (!wb_lookupsids_move_name(
 544                     &src_domains, &src_name,
 545                     state->res_domains, state->res_names,
 546                     res_sid_index)) {
 547                 tevent_req_oom(req);
 548                 return;
 549         }
 550         state->single_sids_done += 1;
 551         wb_lookupsids_next(req, state);
 552 }
 553
 554 static void wb_lookupsids_lookuprids_done(struct tevent_req *subreq)
 555 {
 556         struct tevent_req *req = tevent_req_callback_data(
 557                 subreq, struct tevent_req);
 558         struct wb_lookupsids_state *state = tevent_req_data(
 559                 req, struct wb_lookupsids_state);
 560         struct dom_sid src_domain_sid;
 561         struct lsa_DomainInfo src_domain;
 562         struct lsa_RefDomainList src_domains;
 563         NTSTATUS status, result;
 564         struct wb_lookupsids_domain *d;
 565         uint32_t i;
 566         bool fallback = false;
 567
 568         status = dcerpc_wbint_LookupRids_recv(subreq, state, &result);
 569         TALLOC_FREE(subreq);
 570         if (tevent_req_nterror(req, status)) {
 571                 return;
 572         }
 573
 574         d = &state->domains[state->domains_done];
 575
 576         if (NT_STATUS_IS_ERR(result)) {
 577                 fallback = true;
 578         } else if (state->rid_names.num_principals != d->sids.num_sids) {
 579                 fallback = true;
 580         }
 581
 582         if (fallback) {
 583                 for (i=0; i < d->sids.num_sids; i++) {
 584                         uint32_t res_sid_index = d->sid_indexes[i];
 585
 586                         state->single_sids[state->num_single_sids] =
 587                                 res_sid_index;
 588                         state->num_single_sids += 1;
 589                 }
 590                 state->domains_done += 1;
 591                 wb_lookupsids_next(req, state);
 592                 return;
 593         }
 594
 595         /*
 596          * Look at the individual states in the translated names.
 597          */
 598
 599         sid_copy(&src_domain_sid, get_global_sam_sid());
 600         src_domain.name.string = get_global_sam_name();
 601         src_domain.sid = &src_domain_sid;
 602         src_domains.count = 1;
 603         src_domains.domains = &src_domain;
 604
 605         for (i=0; i<state->rid_names.num_principals; i++) {
 606                 struct lsa_TranslatedName src_name;
 607                 uint32_t res_sid_index;
 608
 609                 /*
 610                  * Fake up structs for wb_lookupsids_move_name
 611                  */
 612                 res_sid_index = d->sid_indexes[i];
 613
 614                 src_name.sid_type = state->rid_names.principals[i].type;
 615                 src_name.name.string = state->rid_names.principals[i].name;
 616                 src_name.sid_index = 0;
 617
 618                 if (!wb_lookupsids_move_name(
 619                             &src_domains, &src_name,
 620                             state->res_domains, state->res_names,
 621                             res_sid_index)) {
 622                         tevent_req_oom(req);
 623                         return;
 624                 }
 625         }
 626
 627         state->domains_done += 1;
 628         wb_lookupsids_next(req, state);
 629 }
 630
 631 NTSTATUS wb_lookupsids_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 632                             struct lsa_RefDomainList **domains,
 633                             struct lsa_TransNameArray **names)
 634 {
 635         struct wb_lookupsids_state *state = tevent_req_data(
 636                 req, struct wb_lookupsids_state);
 637         NTSTATUS status;
 638
 639         if (tevent_req_is_nterror(req, &status)) {
 640                 return status;
 641         }
 642
 643         /*
 644          * The returned names need to match the given sids,
 645          * if not we have a bug in the code!
 646          *
 647          */
 648         if (state->res_names->count != state->num_sids) {
 649                 DEBUG(0, ("res_names->count = %d, expected %d\n",
 650                           state->res_names->count, state->num_sids));
 651                 return NT_STATUS_INTERNAL_ERROR;
 652         }
 653
 654         /*
 655          * Not strictly needed, but it might make debugging in the callers
 656          * easier in future, if the talloc_array_length() returns the
 657          * expected result...
 658          */
 659         state->res_domains->domains = talloc_realloc(state->res_domains,
 660                                                      state->res_domains->domains,
 661                                                      struct lsa_DomainInfo,
 662                                                      state->res_domains->count);
 663
 664         *domains = talloc_move(mem_ctx, &state->res_domains);
 665         *names = talloc_move(mem_ctx, &state->res_names);
 666         return NT_STATUS_OK;
 667 }