source3/winbindd/winbindd_sids_to_xids.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    async implementation of WINBINDD_SIDS_TO_XIDS
   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 "../libcli/security/security.h"
  23 #include "librpc/gen_ndr/ndr_wbint_c.h"
  24 #include "idmap_cache.h"
  25
  26 struct winbindd_sids_to_xids_state {
  27         struct tevent_context *ev;
  28         struct dom_sid *sids;
  29         uint32_t num_sids;
  30
  31         struct id_map *cached;
  32
  33         struct dom_sid *non_cached;
  34         uint32_t num_non_cached;
  35
  36         struct lsa_RefDomainList *domains;
  37         struct lsa_TransNameArray *names;
  38
  39         struct wbint_TransIDArray ids;
  40 };
  41
  42 static bool winbindd_sids_to_xids_in_cache(struct dom_sid *sid,
  43                                            struct id_map *map);
  44 static void winbindd_sids_to_xids_lookupsids_done(struct tevent_req *subreq);
  45 static void winbindd_sids_to_xids_done(struct tevent_req *subreq);
  46
  47 struct tevent_req *winbindd_sids_to_xids_send(TALLOC_CTX *mem_ctx,
  48                                               struct tevent_context *ev,
  49                                               struct winbindd_cli_state *cli,
  50                                               struct winbindd_request *request)
  51 {
  52         struct tevent_req *req, *subreq;
  53         struct winbindd_sids_to_xids_state *state;
  54         uint32_t i;
  55
  56         req = tevent_req_create(mem_ctx, &state,
  57                                 struct winbindd_sids_to_xids_state);
  58         if (req == NULL) {
  59                 return NULL;
  60         }
  61         state->ev = ev;
  62
  63         DEBUG(3, ("sids_to_xids\n"));
  64
  65         if (request->extra_len == 0) {
  66                 tevent_req_done(req);
  67                 return tevent_req_post(req, ev);
  68         }
  69         if (request->extra_data.data[request->extra_len-1] != '\0') {
  70                 DEBUG(10, ("Got invalid sids list\n"));
  71                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
  72                 return tevent_req_post(req, ev);
  73         }
  74         if (!parse_sidlist(state, request->extra_data.data,
  75                            &state->sids, &state->num_sids)) {
  76                 DEBUG(10, ("parse_sidlist failed\n"));
  77                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
  78                 return tevent_req_post(req, ev);
  79         }
  80
  81         DEBUG(10, ("num_sids: %d\n", (int)state->num_sids));
  82
  83         state->cached = TALLOC_ZERO_ARRAY(state, struct id_map,
  84                                           state->num_sids);
  85         if (tevent_req_nomem(state->cached, req)) {
  86                 return tevent_req_post(req, ev);
  87         }
  88         state->non_cached = TALLOC_ARRAY(state, struct dom_sid,
  89                                          state->num_sids);
  90         if (tevent_req_nomem(state->non_cached, req)) {
  91                 return tevent_req_post(req, ev);
  92         }
  93
  94         for (i=0; i<state->num_sids; i++) {
  95
  96                 DEBUG(10, ("SID %d: %s\n", (int)i,
  97                            sid_string_dbg(&state->sids[i])));
  98
  99                 if (winbindd_sids_to_xids_in_cache(&state->sids[i],
 100                                                    &state->cached[i])) {
 101                         continue;
 102                 }
 103                 sid_copy(&state->non_cached[state->num_non_cached],
 104                          &state->sids[i]);
 105                 state->num_non_cached += 1;
 106         }
 107
 108         if (state->num_non_cached == 0) {
 109                 tevent_req_done(req);
 110                 return tevent_req_post(req, ev);
 111         }
 112
 113         subreq = wb_lookupsids_send(state, ev, state->non_cached,
 114                                     state->num_non_cached);
 115         if (tevent_req_nomem(subreq, req)) {
 116                 return tevent_req_post(req, ev);
 117         }
 118         tevent_req_set_callback(subreq, winbindd_sids_to_xids_lookupsids_done,
 119                                 req);
 120         return req;
 121 }
 122
 123 static bool winbindd_sids_to_xids_in_cache(struct dom_sid *sid,
 124                                            struct id_map *map)
 125 {
 126         bool is_online = is_domain_online(find_our_domain());
 127         gid_t gid = (gid_t)-1;
 128         bool gid_expired = false;
 129         bool gid_cached = false;
 130         bool gid_negative = false;
 131         uid_t uid = (uid_t)-1;
 132         bool uid_expired = false;
 133         bool uid_cached = false;
 134         bool uid_negative = false;
 135
 136         if (!winbindd_use_idmap_cache()) {
 137                 return false;
 138         }
 139
 140         /*
 141          * SIDS_TO_XIDS is primarily used to resolve the user's group
 142          * sids. So we check groups before users.
 143          */
 144         gid_cached = idmap_cache_find_sid2gid(sid, &gid, &gid_expired);
 145         if (!is_online) {
 146                 gid_expired = false;
 147         }
 148         if (gid_cached && !gid_expired) {
 149                 if (gid != (gid_t)-1) {
 150                         map->sid = sid;
 151                         map->xid.id = gid;
 152                         map->xid.type = ID_TYPE_GID;
 153                         map->status = ID_MAPPED;
 154                         return true;
 155                 }
 156                 gid_negative = true;
 157         }
 158         uid_cached = idmap_cache_find_sid2uid(sid, &uid, &uid_expired);
 159         if (!is_online) {
 160                 uid_expired = false;
 161         }
 162         if (uid_cached && !uid_expired) {
 163                 if (uid != (uid_t)-1) {
 164                         map->sid = sid;
 165                         map->xid.id = uid;
 166                         map->xid.type = ID_TYPE_UID;
 167                         map->status = ID_MAPPED;
 168                         return true;
 169                 }
 170                 uid_negative = true;
 171         }
 172
 173         /*
 174          * Here we know that we only have negative
 175          * or no entries.
 176          *
 177          * All valid cases already returned to the caller.
 178          */
 179
 180         if (gid_negative && uid_negative) {
 181                 map->sid = sid;
 182                 map->xid.id = UINT32_MAX;
 183                 map->xid.type = ID_TYPE_NOT_SPECIFIED;
 184                 map->status = ID_MAPPED;
 185                 return true;
 186         }
 187
 188         if (gid_negative) {
 189                 map->sid = sid;
 190                 map->xid.id = gid; /* this is (gid_t)-1 */
 191                 map->xid.type = ID_TYPE_GID;
 192                 map->status = ID_MAPPED;
 193                 return true;
 194         }
 195
 196         if (uid_negative) {
 197                 map->sid = sid;
 198                 map->xid.id = uid; /* this is (uid_t)-1 */
 199                 map->xid.type = ID_TYPE_UID;
 200                 map->status = ID_MAPPED;
 201                 return true;
 202         }
 203
 204         return false;
 205 }
 206
 207 static void winbindd_sids_to_xids_lookupsids_done(struct tevent_req *subreq)
 208 {
 209         struct tevent_req *req = tevent_req_callback_data(
 210                 subreq, struct tevent_req);
 211         struct winbindd_sids_to_xids_state *state = tevent_req_data(
 212                 req, struct winbindd_sids_to_xids_state);
 213         struct winbindd_child *child;
 214         NTSTATUS status;
 215         int i;
 216
 217         status = wb_lookupsids_recv(subreq, state, &state->domains,
 218                                     &state->names);
 219         TALLOC_FREE(subreq);
 220         if (tevent_req_nterror(req, status)) {
 221                 return;
 222         }
 223
 224         state->ids.num_ids = state->num_non_cached;
 225         state->ids.ids = TALLOC_ARRAY(state, struct wbint_TransID,
 226                                       state->num_non_cached);
 227         if (tevent_req_nomem(state->ids.ids, req)) {
 228                 return;
 229         }
 230
 231         for (i=0; i<state->num_non_cached; i++) {
 232                 struct lsa_TranslatedName *n = &state->names->names[i];
 233                 struct wbint_TransID *t = &state->ids.ids[i];
 234
 235                 switch (n->sid_type) {
 236                 case SID_NAME_USER:
 237                 case SID_NAME_COMPUTER:
 238                         t->type = WBC_ID_TYPE_UID;
 239                         break;
 240                 case SID_NAME_DOM_GRP:
 241                 case SID_NAME_ALIAS:
 242                 case SID_NAME_WKN_GRP:
 243                         t->type = WBC_ID_TYPE_GID;
 244                         break;
 245                 default:
 246                         t->type = WBC_ID_TYPE_NOT_SPECIFIED;
 247                         break;
 248                 };
 249                 t->domain_index = n->sid_index;
 250                 sid_peek_rid(&state->non_cached[i], &t->rid);
 251                 t->unix_id = (uint64_t)-1;
 252         }
 253
 254         child = idmap_child();
 255
 256         subreq = dcerpc_wbint_Sids2UnixIDs_send(
 257                 state, state->ev, child->binding_handle, state->domains,
 258                 &state->ids);
 259         if (tevent_req_nomem(subreq, req)) {
 260                 return;
 261         }
 262         tevent_req_set_callback(subreq, winbindd_sids_to_xids_done, req);
 263 }
 264
 265 static void winbindd_sids_to_xids_done(struct tevent_req *subreq)
 266 {
 267         struct tevent_req *req = tevent_req_callback_data(
 268                 subreq, struct tevent_req);
 269         struct winbindd_sids_to_xids_state *state = tevent_req_data(
 270                 req, struct winbindd_sids_to_xids_state);
 271         NTSTATUS status, result;
 272
 273         status = dcerpc_wbint_Sids2UnixIDs_recv(subreq, state, &result);
 274         TALLOC_FREE(subreq);
 275         if (any_nt_status_not_ok(status, result, &status)) {
 276                 tevent_req_nterror(req, status);
 277                 return;
 278         }
 279         tevent_req_done(req);
 280 }
 281
 282 NTSTATUS winbindd_sids_to_xids_recv(struct tevent_req *req,
 283                                     struct winbindd_response *response)
 284 {
 285         struct winbindd_sids_to_xids_state *state = tevent_req_data(
 286                 req, struct winbindd_sids_to_xids_state);
 287         NTSTATUS status;
 288         char *result;
 289         uint32_t i, num_non_cached;
 290
 291         if (tevent_req_is_nterror(req, &status)) {
 292                 DEBUG(5, ("wb_sids_to_xids failed: %s\n", nt_errstr(status)));
 293                 return status;
 294         }
 295
 296         result = talloc_strdup(response, "");
 297         if (result == NULL) {
 298                 return NT_STATUS_NO_MEMORY;
 299         }
 300
 301         num_non_cached = 0;
 302
 303         for (i=0; i<state->num_sids; i++) {
 304                 char type;
 305                 uint32_t unix_id = UINT32_MAX;
 306                 bool found = true;
 307
 308                 if (state->cached[i].sid != NULL) {
 309                         unix_id = state->cached[i].xid.id;
 310
 311                         switch (state->cached[i].xid.type) {
 312                         case ID_TYPE_UID:
 313                                 type = 'U';
 314                                 break;
 315                         case ID_TYPE_GID:
 316                                 type = 'G';
 317                                 break;
 318                         default:
 319                                 found = false;
 320                                 break;
 321                         }
 322                 } else {
 323                         unix_id = state->ids.ids[num_non_cached].unix_id;
 324
 325                         switch(state->ids.ids[num_non_cached].type) {
 326                         case WBC_ID_TYPE_UID:
 327                                 type = 'U';
 328                                 idmap_cache_set_sid2uid(
 329                                         &state->non_cached[num_non_cached],
 330                                         unix_id);
 331                                 break;
 332                         case WBC_ID_TYPE_GID:
 333                                 type = 'G';
 334                                 idmap_cache_set_sid2gid(
 335                                         &state->non_cached[num_non_cached],
 336                                         unix_id);
 337                                 break;
 338                         default:
 339                                 found = false;
 340                                 break;
 341                         }
 342                         num_non_cached += 1;
 343                 }
 344
 345                 if (unix_id == UINT32_MAX) {
 346                         found = false;
 347                 }
 348
 349                 if (found) {
 350                         result = talloc_asprintf_append_buffer(
 351                                 result, "%c%lu\n", type,
 352                                 (unsigned long)unix_id);
 353                 } else {
 354                         result = talloc_asprintf_append_buffer(result, "\n");
 355                 }
 356                 if (result == NULL) {
 357                         return NT_STATUS_NO_MEMORY;
 358                 }
 359         }
 360
 361         response->extra_data.data = result;
 362         response->length += talloc_get_size(result);
 363         return NT_STATUS_OK;
 364 }