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_wbint_c.h"
  26 #include "lsa.h"
  27
  28 struct wb_sids2xids_state {
  29         struct tevent_context *ev;
  30
  31         struct dom_sid *sids;
  32         uint32_t num_sids;
  33
  34         struct id_map *cached;
  35
  36         struct dom_sid *non_cached;
  37         uint32_t num_non_cached;
  38
  39         struct lsa_RefDomainList *domains;
  40         struct lsa_TransNameArray *names;
  41
  42         /*
  43          * Domain array to use for the idmap call. The output from
  44          * lookupsids cannot be used directly since for migrated
  45          * objects the returned domain SID can be different that the
  46          * original one. The new domain SID cannot be combined with
  47          * the RID from the previous domain.
  48          *
  49          * The proper way would be asking for the correct RID in the
  50          * new domain, but this approach avoids id mappings for
  51          * invalid SIDs.
  52          */
  53         struct lsa_RefDomainList *idmap_doms;
  54
  55         struct wbint_TransIDArray ids;
  56 };
  57
  58
  59 static bool wb_sids2xids_in_cache(struct dom_sid *sid, struct id_map *map);
  60 static void wb_sids2xids_lookupsids_done(struct tevent_req *subreq);
  61 static void wb_sids2xids_done(struct tevent_req *subreq);
  62
  63 struct tevent_req *wb_sids2xids_send(TALLOC_CTX *mem_ctx,
  64                                      struct tevent_context *ev,
  65                                      const struct dom_sid *sids,
  66                                      const uint32_t num_sids)
  67 {
  68         struct tevent_req *req, *subreq;
  69         struct wb_sids2xids_state *state;
  70         uint32_t i;
  71
  72         req = tevent_req_create(mem_ctx, &state,
  73                                 struct wb_sids2xids_state);
  74         if (req == NULL) {
  75                 return NULL;
  76         }
  77
  78         state->ev = ev;
  79
  80         state->num_sids = num_sids;
  81
  82         state->sids = talloc_zero_array(state, struct dom_sid, num_sids);
  83         if (tevent_req_nomem(state->sids, req)) {
  84                 return tevent_req_post(req, ev);
  85         }
  86
  87         for (i = 0; i < num_sids; i++) {
  88                 sid_copy(&state->sids[i], &sids[i]);
  89         }
  90
  91         state->cached = talloc_zero_array(state, struct id_map, num_sids);
  92         if (tevent_req_nomem(state->cached, req)) {
  93                 return tevent_req_post(req, ev);
  94         }
  95
  96         state->non_cached = talloc_array(state, struct dom_sid, num_sids);
  97         if (tevent_req_nomem(state->non_cached, req)) {
  98                 return tevent_req_post(req, ev);
  99         }
 100
 101         /*
 102          * Extract those sids that can not be resolved from cache
 103          * into a separate list to be handed to id mapping, keeping
 104          * the same index.
 105          */
 106         for (i=0; i<state->num_sids; i++) {
 107
 108                 DEBUG(10, ("SID %d: %s\n", (int)i,
 109                            sid_string_dbg(&state->sids[i])));
 110
 111                 if (wb_sids2xids_in_cache(&state->sids[i], &state->cached[i])) {
 112                         continue;
 113                 }
 114                 sid_copy(&state->non_cached[state->num_non_cached],
 115                          &state->sids[i]);
 116                 state->num_non_cached += 1;
 117         }
 118
 119         if (state->num_non_cached == 0) {
 120                 tevent_req_done(req);
 121                 return tevent_req_post(req, ev);
 122         }
 123
 124         subreq = wb_lookupsids_send(state, ev, state->non_cached,
 125                                     state->num_non_cached);
 126         if (tevent_req_nomem(subreq, req)) {
 127                 return tevent_req_post(req, ev);
 128         }
 129         tevent_req_set_callback(subreq, wb_sids2xids_lookupsids_done, req);
 130         return req;
 131 }
 132
 133 static bool wb_sids2xids_in_cache(struct dom_sid *sid, struct id_map *map)
 134 {
 135         struct unixid id;
 136         bool expired;
 137
 138         if (!winbindd_use_idmap_cache()) {
 139                 return false;
 140         }
 141         if (idmap_cache_find_sid2unixid(sid, &id, &expired)) {
 142                 if (expired && is_domain_online(find_our_domain())) {
 143                         return false;
 144                 }
 145                 map->sid = sid;
 146                 map->xid = id;
 147                 map->status = ID_MAPPED;
 148                 return true;
 149         }
 150         return false;
 151 }
 152
 153 static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type);
 154
 155 static void wb_sids2xids_lookupsids_done(struct tevent_req *subreq)
 156 {
 157         struct tevent_req *req = tevent_req_callback_data(
 158                 subreq, struct tevent_req);
 159         struct wb_sids2xids_state *state = tevent_req_data(
 160                 req, struct wb_sids2xids_state);
 161         struct winbindd_child *child;
 162         NTSTATUS status;
 163         int i;
 164
 165         status = wb_lookupsids_recv(subreq, state, &state->domains,
 166                                     &state->names);
 167         TALLOC_FREE(subreq);
 168         if (tevent_req_nterror(req, status)) {
 169                 return;
 170         }
 171
 172         state->ids.num_ids = state->num_non_cached;
 173         state->ids.ids = talloc_array(state, struct wbint_TransID,
 174                                       state->num_non_cached);
 175         if (tevent_req_nomem(state->ids.ids, req)) {
 176                 return;
 177         }
 178
 179         state->idmap_doms = talloc_zero(state, struct lsa_RefDomainList);
 180         if (tevent_req_nomem(state->idmap_doms, req)) {
 181                 return;
 182         }
 183
 184         for (i=0; i<state->num_non_cached; i++) {
 185                 struct dom_sid dom_sid;
 186                 struct lsa_DomainInfo *info;
 187                 struct lsa_TranslatedName *n = &state->names->names[i];
 188                 struct wbint_TransID *t = &state->ids.ids[i];
 189
 190                 sid_copy(&dom_sid, &state->non_cached[i]);
 191                 sid_split_rid(&dom_sid, &t->rid);
 192
 193                 info = &state->domains->domains[n->sid_index];
 194                 t->type = lsa_SidType_to_id_type(n->sid_type);
 195                 t->domain_index = init_lsa_ref_domain_list(state,
 196                                                            state->idmap_doms,
 197                                                            info->name.string,
 198                                                            &dom_sid);
 199                 t->xid.id = UINT32_MAX;
 200                 t->xid.type = t->type;
 201         }
 202
 203         child = idmap_child();
 204
 205         subreq = dcerpc_wbint_Sids2UnixIDs_send(
 206                 state, state->ev, child->binding_handle, state->idmap_doms,
 207                 &state->ids);
 208         if (tevent_req_nomem(subreq, req)) {
 209                 return;
 210         }
 211         tevent_req_set_callback(subreq, wb_sids2xids_done, req);
 212 }
 213
 214 static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type)
 215 {
 216         enum id_type type;
 217
 218         switch(sid_type) {
 219         case SID_NAME_COMPUTER:
 220         case SID_NAME_USER:
 221                 type = ID_TYPE_UID;
 222                 break;
 223         case SID_NAME_DOM_GRP:
 224         case SID_NAME_ALIAS:
 225         case SID_NAME_WKN_GRP:
 226                 type = ID_TYPE_GID;
 227                 break;
 228         default:
 229                 type = ID_TYPE_NOT_SPECIFIED;
 230                 break;
 231         }
 232
 233         return type;
 234 }
 235
 236
 237 static void wb_sids2xids_done(struct tevent_req *subreq)
 238 {
 239         struct tevent_req *req = tevent_req_callback_data(
 240                 subreq, struct tevent_req);
 241         struct wb_sids2xids_state *state = tevent_req_data(
 242                 req, struct wb_sids2xids_state);
 243         NTSTATUS status, result;
 244
 245         status = dcerpc_wbint_Sids2UnixIDs_recv(subreq, state, &result);
 246         TALLOC_FREE(subreq);
 247         if (any_nt_status_not_ok(status, result, &status)) {
 248                 tevent_req_nterror(req, status);
 249                 return;
 250         }
 251         tevent_req_done(req);
 252 }
 253
 254 NTSTATUS wb_sids2xids_recv(struct tevent_req *req,
 255                            struct unixid *xids)
 256 {
 257         struct wb_sids2xids_state *state = tevent_req_data(
 258                 req, struct wb_sids2xids_state);
 259         NTSTATUS status;
 260         uint32_t i, num_non_cached;
 261
 262         if (tevent_req_is_nterror(req, &status)) {
 263                 DEBUG(5, ("wb_sids_to_xids failed: %s\n", nt_errstr(status)));
 264                 return status;
 265         }
 266
 267         num_non_cached = 0;
 268
 269         for (i=0; i<state->num_sids; i++) {
 270                 struct unixid xid;
 271
 272                 xid.id = UINT32_MAX;
 273
 274                 if (state->cached[i].sid != NULL) {
 275                         xid = state->cached[i].xid;
 276                 } else {
 277                         xid = state->ids.ids[num_non_cached].xid;
 278
 279                         idmap_cache_set_sid2unixid(
 280                                 &state->non_cached[num_non_cached],
 281                                 &xid);
 282
 283                         num_non_cached += 1;
 284                 }
 285
 286                 xids[i] = xid;
 287         }
 288
 289         return NT_STATUS_OK;
 290 }