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
  27 struct wb_xids2sids_dom_map {
  28         unsigned low_id;
  29         unsigned high_id;
  30         const char *name;
  31 };
  32
  33 /*
  34  * Map idmap ranges to domain names, taken from smb.conf. This is
  35  * stored in the parent winbind and used to assemble xid2sid calls
  36  * into per-idmap-domain chunks.
  37  */
  38 static struct wb_xids2sids_dom_map *dom_maps;
  39
  40 static bool wb_xids2sids_add_dom(const char *domname,
  41                                  void *private_data)
  42 {
  43         struct wb_xids2sids_dom_map *map = NULL;
  44         size_t num_maps = talloc_array_length(dom_maps);
  45         size_t i;
  46         char *config_option;
  47         const char *range;
  48         unsigned low_id, high_id;
  49         int ret;
  50
  51         config_option = talloc_asprintf(
  52                 talloc_tos(), "idmap config %s", domname);
  53         if (config_option == NULL) {
  54                 return false;
  55         }
  56         range = lp_parm_const_string(-1, config_option, "range", NULL);
  57         TALLOC_FREE(config_option);
  58
  59         if (range == NULL) {
  60                 DBG_DEBUG("No range for domain %s found\n", domname);
  61                 return false;
  62         }
  63
  64         ret = sscanf(range, "%u - %u", &low_id, &high_id);
  65         if (ret != 2) {
  66                 DBG_DEBUG("Invalid range spec \"%s\" for domain %s\n",
  67                           range, domname);
  68                 return false;
  69         }
  70
  71         if (low_id > high_id) {
  72                 DBG_DEBUG("Invalid range %u - %u for domain %s\n",
  73                           low_id, high_id, domname);
  74                 return false;
  75         }
  76
  77         for (i=0; i<num_maps; i++) {
  78                 if (strequal(domname, dom_maps[i].name)) {
  79                         map = &dom_maps[i];
  80                         break;
  81                 }
  82         }
  83
  84         if (map == NULL) {
  85                 struct wb_xids2sids_dom_map *tmp;
  86                 char *name;
  87
  88                 name = talloc_strdup(talloc_tos(), domname);
  89                 if (name == NULL) {
  90                         DBG_DEBUG("talloc failed\n");
  91                         return false;
  92                 }
  93
  94                 tmp = talloc_realloc(
  95                         NULL, dom_maps, struct wb_xids2sids_dom_map,
  96                         num_maps+1);
  97                 if (tmp == NULL) {
  98                         TALLOC_FREE(name);
  99                         return false;
 100                 }
 101                 dom_maps = tmp;
 102
 103                 map = &dom_maps[num_maps];
 104                 map->name = talloc_move(dom_maps, &name);
 105         }
 106
 107         map->low_id = low_id;
 108         map->high_id = high_id;
 109
 110         return false;
 111 }
 112
 113 static void wb_xids2sids_init_dom_maps(void)
 114 {
 115         if (dom_maps != NULL) {
 116                 return;
 117         }
 118
 119         /*
 120          * Put the passdb idmap domain first. We always need to try
 121          * there first.
 122          */
 123
 124         dom_maps = talloc_array(NULL, struct wb_xids2sids_dom_map, 1);
 125         if (dom_maps == NULL) {
 126                 return;
 127         }
 128         dom_maps[0].low_id = 0;
 129         dom_maps[0].high_id = UINT_MAX;
 130         dom_maps[0].name = talloc_strdup(dom_maps, get_global_sam_name());
 131         if (dom_maps[0].name == NULL) {
 132                 TALLOC_FREE(dom_maps);
 133                 return;
 134         }
 135
 136         lp_scan_idmap_domains(wb_xids2sids_add_dom, NULL);
 137 }
 138
 139 struct wb_xids2sids_dom_state {
 140         struct tevent_context *ev;
 141         struct unixid *all_xids;
 142         size_t num_all_xids;
 143         struct dom_sid *all_sids;
 144         struct wb_xids2sids_dom_map *dom_map;
 145         bool tried_dclookup;
 146
 147         size_t num_dom_xids;
 148         struct unixid *dom_xids;
 149         struct dom_sid *dom_sids;
 150 };
 151
 152 static void wb_xids2sids_dom_done(struct tevent_req *subreq);
 153 static void wb_xids2sids_dom_gotdc(struct tevent_req *subreq);
 154
 155 static struct tevent_req *wb_xids2sids_dom_send(
 156         TALLOC_CTX *mem_ctx, struct tevent_context *ev,
 157         struct wb_xids2sids_dom_map *dom_map,
 158         struct unixid *xids, size_t num_xids, struct dom_sid *sids)
 159 {
 160         struct tevent_req *req, *subreq;
 161         struct wb_xids2sids_dom_state *state;
 162         struct winbindd_child *child;
 163         size_t i;
 164
 165         req = tevent_req_create(mem_ctx, &state,
 166                                 struct wb_xids2sids_dom_state);
 167         if (req == NULL) {
 168                 return NULL;
 169         }
 170         state->ev = ev;
 171         state->all_xids = xids;
 172         state->num_all_xids = num_xids;
 173         state->all_sids = sids;
 174         state->dom_map = dom_map;
 175
 176         state->dom_xids = talloc_array(state, struct unixid, num_xids);
 177         if (tevent_req_nomem(state->dom_xids, req)) {
 178                 return tevent_req_post(req, ev);
 179         }
 180         state->dom_sids = talloc_array(state, struct dom_sid, num_xids);
 181         if (tevent_req_nomem(state->dom_sids, req)) {
 182                 return tevent_req_post(req, ev);
 183         }
 184
 185         for (i=0; i<num_xids; i++) {
 186                 struct unixid id = state->all_xids[i];
 187
 188                 if ((id.id < dom_map->low_id) || (id.id > dom_map->high_id)) {
 189                         /* out of range */
 190                         continue;
 191                 }
 192                 if (!is_null_sid(&state->all_sids[i])) {
 193                         /* already mapped */
 194                         continue;
 195                 }
 196
 197                 state->dom_xids[state->num_dom_xids++] = id;
 198         }
 199
 200         if (state->num_dom_xids == 0) {
 201                 tevent_req_done(req);
 202                 return tevent_req_post(req, ev);
 203         }
 204
 205         child = idmap_child();
 206         subreq = dcerpc_wbint_UnixIDs2Sids_send(
 207                 state, ev, child->binding_handle, dom_map->name,
 208                 state->num_dom_xids, state->dom_xids, state->dom_sids);
 209         if (tevent_req_nomem(subreq, req)) {
 210                 return tevent_req_post(req, ev);
 211         }
 212         tevent_req_set_callback(subreq, wb_xids2sids_dom_done, req);
 213         return req;
 214 }
 215
 216 static void wb_xids2sids_dom_done(struct tevent_req *subreq)
 217 {
 218         struct tevent_req *req = tevent_req_callback_data(
 219                 subreq, struct tevent_req);
 220         struct wb_xids2sids_dom_state *state = tevent_req_data(
 221                 req, struct wb_xids2sids_dom_state);
 222         struct wb_xids2sids_dom_map *dom_map = state->dom_map;
 223         NTSTATUS status, result;
 224         size_t i;
 225         size_t dom_sid_idx;
 226
 227         status = dcerpc_wbint_UnixIDs2Sids_recv(subreq, state, &result);
 228         TALLOC_FREE(subreq);
 229         if (tevent_req_nterror(req, status)) {
 230                 return;
 231         }
 232
 233         if (NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) &&
 234             !state->tried_dclookup) {
 235
 236                 subreq = wb_dsgetdcname_send(
 237                         state, state->ev, state->dom_map->name, NULL, NULL,
 238                         DS_RETURN_DNS_NAME);
 239                 if (tevent_req_nomem(subreq, req)) {
 240                         return;
 241                 }
 242                 tevent_req_set_callback(subreq, wb_xids2sids_dom_gotdc, req);
 243                 return;
 244         }
 245
 246         if (!NT_STATUS_EQUAL(result, NT_STATUS_NONE_MAPPED) &&
 247             tevent_req_nterror(req, result)) {
 248                 return;
 249         }
 250
 251         dom_sid_idx = 0;
 252
 253         for (i=0; i<state->num_all_xids; i++) {
 254                 struct unixid id = state->all_xids[i];
 255
 256                 if ((id.id < dom_map->low_id) || (id.id > dom_map->high_id)) {
 257                         /* out of range */
 258                         continue;
 259                 }
 260                 if (!is_null_sid(&state->all_sids[i])) {
 261                         /* already mapped */
 262                         continue;
 263                 }
 264
 265                 sid_copy(&state->all_sids[i], &state->dom_sids[dom_sid_idx++]);
 266         }
 267
 268         tevent_req_done(req);
 269 }
 270
 271 static void wb_xids2sids_dom_gotdc(struct tevent_req *subreq)
 272 {
 273         struct tevent_req *req = tevent_req_callback_data(
 274                 subreq, struct tevent_req);
 275         struct wb_xids2sids_dom_state *state = tevent_req_data(
 276                 req, struct wb_xids2sids_dom_state);
 277         struct winbindd_child *child = idmap_child();
 278         struct netr_DsRGetDCNameInfo *dcinfo;
 279         NTSTATUS status;
 280
 281         status = wb_dsgetdcname_recv(subreq, state, &dcinfo);
 282         TALLOC_FREE(subreq);
 283         if (tevent_req_nterror(req, status)) {
 284                 return;
 285         }
 286
 287         state->tried_dclookup = true;
 288
 289         status = wb_dsgetdcname_gencache_set(state->dom_map->name, dcinfo);
 290         if (tevent_req_nterror(req, status)) {
 291                 return;
 292         }
 293
 294         child = idmap_child();
 295         subreq = dcerpc_wbint_UnixIDs2Sids_send(
 296                 state, state->ev, child->binding_handle, state->dom_map->name,
 297                 state->num_dom_xids, state->dom_xids, state->dom_sids);
 298         if (tevent_req_nomem(subreq, req)) {
 299                 return;
 300         }
 301         tevent_req_set_callback(subreq, wb_xids2sids_dom_done, req);
 302 }
 303
 304 static NTSTATUS wb_xids2sids_dom_recv(struct tevent_req *req)
 305 {
 306         return tevent_req_simple_recv_ntstatus(req);
 307 }
 308
 309 struct wb_xids2sids_state {
 310         struct tevent_context *ev;
 311         struct unixid *xids;
 312         size_t num_xids;
 313         struct dom_sid *sids;
 314
 315         size_t dom_idx;
 316 };
 317
 318 static void wb_xids2sids_done(struct tevent_req *subreq);
 319
 320 struct tevent_req *wb_xids2sids_send(TALLOC_CTX *mem_ctx,
 321                                      struct tevent_context *ev,
 322                                      struct unixid *xids,
 323                                      uint32_t num_xids)
 324 {
 325         struct tevent_req *req, *subreq;
 326         struct wb_xids2sids_state *state;
 327         size_t num_domains;
 328
 329         req = tevent_req_create(mem_ctx, &state,
 330                                 struct wb_xids2sids_state);
 331         if (req == NULL) {
 332                 return NULL;
 333         }
 334         state->ev = ev;
 335         state->xids = xids;
 336         state->num_xids = num_xids;
 337
 338         state->sids = talloc_zero_array(state, struct dom_sid, num_xids);
 339         if (tevent_req_nomem(state->sids, req)) {
 340                 return tevent_req_post(req, ev);
 341         }
 342
 343         wb_xids2sids_init_dom_maps();
 344         num_domains = talloc_array_length(dom_maps);
 345
 346         if (num_domains == 0) {
 347                 tevent_req_done(req);
 348                 return tevent_req_post(req, ev);
 349         }
 350
 351         subreq = wb_xids2sids_dom_send(
 352                 state, state->ev, &dom_maps[state->dom_idx],
 353                 state->xids, state->num_xids, state->sids);
 354         if (tevent_req_nomem(subreq, req)) {
 355                 return tevent_req_post(req, ev);
 356         }
 357         tevent_req_set_callback(subreq, wb_xids2sids_done, req);
 358         return req;
 359 }
 360
 361 static void wb_xids2sids_done(struct tevent_req *subreq)
 362 {
 363         struct tevent_req *req = tevent_req_callback_data(
 364                 subreq, struct tevent_req);
 365         struct wb_xids2sids_state *state = tevent_req_data(
 366                 req, struct wb_xids2sids_state);
 367         size_t num_domains = talloc_array_length(dom_maps);
 368         NTSTATUS status;
 369
 370         status = wb_xids2sids_dom_recv(subreq);
 371         TALLOC_FREE(subreq);
 372         if (tevent_req_nterror(req, status)) {
 373                 return;
 374         }
 375
 376         state->dom_idx += 1;
 377
 378         if (state->dom_idx >= num_domains) {
 379                 tevent_req_done(req);
 380                 return;
 381         }
 382
 383         subreq = wb_xids2sids_dom_send(
 384                 state, state->ev, &dom_maps[state->dom_idx],
 385                 state->xids, state->num_xids, state->sids);
 386         if (tevent_req_nomem(subreq, req)) {
 387                 return;
 388         }
 389         tevent_req_set_callback(subreq, wb_xids2sids_done, req);
 390 }
 391
 392 NTSTATUS wb_xids2sids_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 393                            struct dom_sid **sids)
 394 {
 395         struct wb_xids2sids_state *state = tevent_req_data(
 396                 req, struct wb_xids2sids_state);
 397         NTSTATUS status;
 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         *sids = talloc_move(mem_ctx, &state->sids);
 405         return NT_STATUS_OK;
 406 }