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         uid_t uid;
 127         gid_t gid;
 128         bool expired;
 129
 130         if (!winbindd_use_idmap_cache()) {
 131                 return false;
 132         }
 133         /*
 134          * SIDS_TO_XIDS is primarily used to resolve the user's group
 135          * sids. So we check groups before users.
 136          */
 137         if (idmap_cache_find_sid2gid(sid, &gid, &expired)) {
 138                 if (expired && is_domain_offline(find_our_domain())) {
 139                         return false;
 140                 }
 141                 map->sid = sid;
 142                 map->xid.id = gid;
 143                 map->xid.type = ID_TYPE_GID;
 144                 map->status = ID_MAPPED;
 145                 return true;
 146         }
 147         if (idmap_cache_find_sid2uid(sid, &uid, &expired)) {
 148                 if (expired && is_domain_online(find_our_domain())) {
 149                         return false;
 150                 }
 151                 map->sid = sid;
 152                 map->xid.id = uid;
 153                 map->xid.type = ID_TYPE_UID;
 154                 map->status = ID_MAPPED;
 155                 return true;
 156         }
 157         return false;
 158 }
 159
 160
 161 static void winbindd_sids_to_xids_lookupsids_done(struct tevent_req *subreq)
 162 {
 163         struct tevent_req *req = tevent_req_callback_data(
 164                 subreq, struct tevent_req);
 165         struct winbindd_sids_to_xids_state *state = tevent_req_data(
 166                 req, struct winbindd_sids_to_xids_state);
 167         struct winbindd_child *child;
 168         NTSTATUS status;
 169         int i;
 170
 171         status = wb_lookupsids_recv(subreq, state, &state->domains,
 172                                     &state->names);
 173         TALLOC_FREE(subreq);
 174         if (tevent_req_nterror(req, status)) {
 175                 return;
 176         }
 177
 178         state->ids.num_ids = state->num_non_cached;
 179         state->ids.ids = TALLOC_ARRAY(state, struct wbint_TransID,
 180                                       state->num_non_cached);
 181         if (tevent_req_nomem(state->ids.ids, req)) {
 182                 return;
 183         }
 184
 185         for (i=0; i<state->num_non_cached; i++) {
 186                 struct lsa_TranslatedName *n = &state->names->names[i];
 187                 struct wbint_TransID *t = &state->ids.ids[i];
 188
 189                 switch (n->sid_type) {
 190                 case SID_NAME_USER:
 191                 case SID_NAME_COMPUTER:
 192                         t->type = WBC_ID_TYPE_UID;
 193                         break;
 194                 case SID_NAME_DOM_GRP:
 195                 case SID_NAME_ALIAS:
 196                 case SID_NAME_WKN_GRP:
 197                         t->type = WBC_ID_TYPE_GID;
 198                         break;
 199                 default:
 200                         t->type = WBC_ID_TYPE_NOT_SPECIFIED;
 201                         break;
 202                 };
 203                 t->domain_index = n->sid_index;
 204                 sid_peek_rid(&state->sids[i], &t->rid);
 205                 t->unix_id = (uint64_t)-1;
 206         }
 207
 208         child = idmap_child();
 209
 210         subreq = dcerpc_wbint_Sids2UnixIDs_send(
 211                 state, state->ev, child->binding_handle, state->domains,
 212                 &state->ids);
 213         if (tevent_req_nomem(subreq, req)) {
 214                 return;
 215         }
 216         tevent_req_set_callback(subreq, winbindd_sids_to_xids_done, req);
 217 }
 218
 219 static void winbindd_sids_to_xids_done(struct tevent_req *subreq)
 220 {
 221         struct tevent_req *req = tevent_req_callback_data(
 222                 subreq, struct tevent_req);
 223         struct winbindd_sids_to_xids_state *state = tevent_req_data(
 224                 req, struct winbindd_sids_to_xids_state);
 225         NTSTATUS status, result;
 226
 227         status = dcerpc_wbint_Sids2UnixIDs_recv(subreq, state, &result);
 228         TALLOC_FREE(subreq);
 229         if (any_nt_status_not_ok(status, result, &status)) {
 230                 tevent_req_nterror(req, status);
 231                 return;
 232         }
 233         tevent_req_done(req);
 234 }
 235
 236 NTSTATUS winbindd_sids_to_xids_recv(struct tevent_req *req,
 237                                     struct winbindd_response *response)
 238 {
 239         struct winbindd_sids_to_xids_state *state = tevent_req_data(
 240                 req, struct winbindd_sids_to_xids_state);
 241         NTSTATUS status;
 242         char *result;
 243         uint32_t i, num_non_cached;
 244
 245         if (tevent_req_is_nterror(req, &status)) {
 246                 DEBUG(5, ("wb_sids_to_xids failed: %s\n", nt_errstr(status)));
 247                 return status;
 248         }
 249
 250         result = talloc_strdup(response, "");
 251         if (result == NULL) {
 252                 return NT_STATUS_NO_MEMORY;
 253         }
 254
 255         num_non_cached = 0;
 256
 257         for (i=0; i<state->num_sids; i++) {
 258                 char type;
 259                 uint64_t unix_id = (uint64_t)-1;
 260                 bool found = true;
 261
 262                 if (state->cached[i].sid != NULL) {
 263                         unix_id = state->cached[i].xid.id;
 264                         if (state->cached[i].xid.type == ID_TYPE_UID) {
 265                                 type = 'U';
 266                         } else {
 267                                 type = 'G';
 268                         }
 269                 } else {
 270                         unix_id = state->ids.ids[num_non_cached].unix_id;
 271                         switch(state->ids.ids[num_non_cached].type) {
 272                         case WBC_ID_TYPE_UID:
 273                                 type = 'U';
 274                                 idmap_cache_set_sid2uid(
 275                                         &state->non_cached[num_non_cached],
 276                                         unix_id);
 277                                 break;
 278                         case WBC_ID_TYPE_GID:
 279                                 type = 'G';
 280                                 idmap_cache_set_sid2gid(
 281                                         &state->non_cached[num_non_cached],
 282                                         unix_id);
 283                                 break;
 284                         default:
 285                                 found = false;
 286                         }
 287                         num_non_cached += 1;
 288                 }
 289
 290                 if (found) {
 291                         result = talloc_asprintf_append_buffer(
 292                                 result, "%c%lu\n", type,
 293                                 (unsigned long)unix_id);
 294                 } else {
 295                         result = talloc_asprintf_append_buffer(result, "\n");
 296                 }
 297                 if (result == NULL) {
 298                         return NT_STATUS_NO_MEMORY;
 299                 }
 300         }
 301
 302         response->extra_data.data = result;
 303         response->length += talloc_get_size(result);
 304         return NT_STATUS_OK;
 305 }