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
  27 struct wb_sids2xids_state {
  28         struct tevent_context *ev;
  29
  30         struct dom_sid *sids;
  31         uint32_t num_sids;
  32
  33         struct id_map *cached;
  34
  35         struct dom_sid *non_cached;
  36         uint32_t num_non_cached;
  37
  38         struct lsa_RefDomainList *domains;
  39         struct lsa_TransNameArray *names;
  40
  41         struct wbint_TransIDArray ids;
  42 };
  43
  44
  45 static bool wb_sids2xids_in_cache(struct dom_sid *sid, struct id_map *map);
  46 static void wb_sids2xids_lookupsids_done(struct tevent_req *subreq);
  47 static void wb_sids2xids_done(struct tevent_req *subreq);
  48
  49 struct tevent_req *wb_sids2xids_send(TALLOC_CTX *mem_ctx,
  50                                      struct tevent_context *ev,
  51                                      const struct dom_sid *sids,
  52                                      const uint32_t num_sids)
  53 {
  54         struct tevent_req *req, *subreq;
  55         struct wb_sids2xids_state *state;
  56         uint32_t i;
  57
  58         req = tevent_req_create(mem_ctx, &state,
  59                                 struct wb_sids2xids_state);
  60         if (req == NULL) {
  61                 return NULL;
  62         }
  63
  64         state->ev = ev;
  65
  66         state->num_sids = num_sids;
  67
  68         state->sids = talloc_zero_array(state, struct dom_sid, num_sids);
  69         if (tevent_req_nomem(state->sids, req)) {
  70                 return tevent_req_post(req, ev);
  71         }
  72
  73         for (i = 0; i < num_sids; i++) {
  74                 sid_copy(&state->sids[i], &sids[i]);
  75         }
  76
  77         state->cached = talloc_zero_array(state, struct id_map, num_sids);
  78         if (tevent_req_nomem(state->cached, req)) {
  79                 return tevent_req_post(req, ev);
  80         }
  81
  82         state->non_cached = talloc_array(state, struct dom_sid, num_sids);
  83         if (tevent_req_nomem(state->non_cached, req)) {
  84                 return tevent_req_post(req, ev);
  85         }
  86
  87         /*
  88          * Extract those sids that can not be resolved from cache
  89          * into a separate list to be handed to id mapping, keeping
  90          * the same index.
  91          */
  92         for (i=0; i<state->num_sids; i++) {
  93
  94                 DEBUG(10, ("SID %d: %s\n", (int)i,
  95                            sid_string_dbg(&state->sids[i])));
  96
  97                 if (wb_sids2xids_in_cache(&state->sids[i], &state->cached[i])) {
  98                         continue;
  99                 }
 100                 sid_copy(&state->non_cached[state->num_non_cached],
 101                          &state->sids[i]);
 102                 state->num_non_cached += 1;
 103         }
 104
 105         if (state->num_non_cached == 0) {
 106                 tevent_req_done(req);
 107                 return tevent_req_post(req, ev);
 108         }
 109
 110         subreq = wb_lookupsids_send(state, ev, state->non_cached,
 111                                     state->num_non_cached);
 112         if (tevent_req_nomem(subreq, req)) {
 113                 return tevent_req_post(req, ev);
 114         }
 115         tevent_req_set_callback(subreq, wb_sids2xids_lookupsids_done, req);
 116         return req;
 117 }
 118
 119 static bool wb_sids2xids_in_cache(struct dom_sid *sid, struct id_map *map)
 120 {
 121         struct unixid id;
 122         bool expired;
 123
 124         if (!winbindd_use_idmap_cache()) {
 125                 return false;
 126         }
 127         if (idmap_cache_find_sid2unixid(sid, &id, &expired)) {
 128                 if (expired && is_domain_online(find_our_domain())) {
 129                         return false;
 130                 }
 131                 map->sid = sid;
 132                 map->xid = id;
 133                 map->status = ID_MAPPED;
 134                 return true;
 135         }
 136         return false;
 137 }
 138
 139 static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type);
 140
 141 static void wb_sids2xids_lookupsids_done(struct tevent_req *subreq)
 142 {
 143         struct tevent_req *req = tevent_req_callback_data(
 144                 subreq, struct tevent_req);
 145         struct wb_sids2xids_state *state = tevent_req_data(
 146                 req, struct wb_sids2xids_state);
 147         struct winbindd_child *child;
 148         NTSTATUS status;
 149         int i;
 150
 151         status = wb_lookupsids_recv(subreq, state, &state->domains,
 152                                     &state->names);
 153         TALLOC_FREE(subreq);
 154         if (tevent_req_nterror(req, status)) {
 155                 return;
 156         }
 157
 158         state->ids.num_ids = state->num_non_cached;
 159         state->ids.ids = talloc_array(state, struct wbint_TransID,
 160                                       state->num_non_cached);
 161         if (tevent_req_nomem(state->ids.ids, req)) {
 162                 return;
 163         }
 164
 165         for (i=0; i<state->num_non_cached; i++) {
 166                 struct lsa_TranslatedName *n = &state->names->names[i];
 167                 struct wbint_TransID *t = &state->ids.ids[i];
 168
 169                 t->type = lsa_SidType_to_id_type(n->sid_type);
 170                 t->domain_index = n->sid_index;
 171                 sid_peek_rid(&state->non_cached[i], &t->rid);
 172                 t->xid.id = UINT32_MAX;
 173                 t->xid.type = t->type;
 174         }
 175
 176         child = idmap_child();
 177
 178         subreq = dcerpc_wbint_Sids2UnixIDs_send(
 179                 state, state->ev, child->binding_handle, state->domains,
 180                 &state->ids);
 181         if (tevent_req_nomem(subreq, req)) {
 182                 return;
 183         }
 184         tevent_req_set_callback(subreq, wb_sids2xids_done, req);
 185 }
 186
 187 static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type)
 188 {
 189         enum id_type type;
 190
 191         switch(sid_type) {
 192         case SID_NAME_COMPUTER:
 193         case SID_NAME_USER:
 194                 type = ID_TYPE_UID;
 195                 break;
 196         case SID_NAME_DOM_GRP:
 197         case SID_NAME_ALIAS:
 198         case SID_NAME_WKN_GRP:
 199                 type = ID_TYPE_GID;
 200                 break;
 201         default:
 202                 type = ID_TYPE_NOT_SPECIFIED;
 203                 break;
 204         }
 205
 206         return type;
 207 }
 208
 209
 210 static void wb_sids2xids_done(struct tevent_req *subreq)
 211 {
 212         struct tevent_req *req = tevent_req_callback_data(
 213                 subreq, struct tevent_req);
 214         struct wb_sids2xids_state *state = tevent_req_data(
 215                 req, struct wb_sids2xids_state);
 216         NTSTATUS status, result;
 217
 218         status = dcerpc_wbint_Sids2UnixIDs_recv(subreq, state, &result);
 219         TALLOC_FREE(subreq);
 220         if (any_nt_status_not_ok(status, result, &status)) {
 221                 tevent_req_nterror(req, status);
 222                 return;
 223         }
 224         tevent_req_done(req);
 225 }
 226
 227 NTSTATUS wb_sids2xids_recv(struct tevent_req *req,
 228                            struct unixid *xids)
 229 {
 230         struct wb_sids2xids_state *state = tevent_req_data(
 231                 req, struct wb_sids2xids_state);
 232         NTSTATUS status;
 233         uint32_t i, num_non_cached;
 234
 235         if (tevent_req_is_nterror(req, &status)) {
 236                 DEBUG(5, ("wb_sids_to_xids failed: %s\n", nt_errstr(status)));
 237                 return status;
 238         }
 239
 240         num_non_cached = 0;
 241
 242         for (i=0; i<state->num_sids; i++) {
 243                 struct unixid xid;
 244
 245                 xid.id = UINT32_MAX;
 246
 247                 if (state->cached[i].sid != NULL) {
 248                         xid = state->cached[i].xid;
 249                 } else {
 250                         xid = state->ids.ids[num_non_cached].xid;
 251
 252                         idmap_cache_set_sid2unixid(
 253                                 &state->non_cached[num_non_cached],
 254                                 &xid);
 255
 256                         num_non_cached += 1;
 257                 }
 258
 259                 xids[i] = xid;
 260         }
 261
 262         return NT_STATUS_OK;
 263 }