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 #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         /*
  40          * Domain array to use for the idmap call. The output from
  41          * lookupsids cannot be used directly since for migrated
  42          * objects the returned domain SID can be different that the
  43          * original one. The new domain SID cannot be combined with
  44          * the RID from the previous domain.
  45          *
  46          * The proper way would be asking for the correct RID in the
  47          * new domain, but this approach avoids id mappings for
  48          * invalid SIDs.
  49          */
  50         struct lsa_RefDomainList *idmap_doms;
  51
  52         struct wbint_TransIDArray ids;
  53 };
  54
  55
  56 static bool wb_sids2xids_in_cache(struct dom_sid *sid, struct id_map *map);
  57 static void wb_sids2xids_lookupsids_done(struct tevent_req *subreq);
  58 static void wb_sids2xids_done(struct tevent_req *subreq);
  59
  60 struct tevent_req *wb_sids2xids_send(TALLOC_CTX *mem_ctx,
  61                                      struct tevent_context *ev,
  62                                      const struct dom_sid *sids,
  63                                      const uint32_t num_sids)
  64 {
  65         struct tevent_req *req, *subreq;
  66         struct wb_sids2xids_state *state;
  67         uint32_t i;
  68
  69         req = tevent_req_create(mem_ctx, &state,
  70                                 struct wb_sids2xids_state);
  71         if (req == NULL) {
  72                 return NULL;
  73         }
  74
  75         state->ev = ev;
  76
  77         state->num_sids = num_sids;
  78
  79         state->sids = talloc_zero_array(state, struct dom_sid, num_sids);
  80         if (tevent_req_nomem(state->sids, req)) {
  81                 return tevent_req_post(req, ev);
  82         }
  83
  84         for (i = 0; i < num_sids; i++) {
  85                 sid_copy(&state->sids[i], &sids[i]);
  86         }
  87
  88         state->cached = talloc_zero_array(state, struct id_map, num_sids);
  89         if (tevent_req_nomem(state->cached, req)) {
  90                 return tevent_req_post(req, ev);
  91         }
  92
  93         state->non_cached = talloc_array(state, struct dom_sid, num_sids);
  94         if (tevent_req_nomem(state->non_cached, req)) {
  95                 return tevent_req_post(req, ev);
  96         }
  97
  98         /*
  99          * Extract those sids that can not be resolved from cache
 100          * into a separate list to be handed to id mapping, keeping
 101          * the same index.
 102          */
 103         for (i=0; i<state->num_sids; i++) {
 104
 105                 DEBUG(10, ("SID %d: %s\n", (int)i,
 106                            sid_string_dbg(&state->sids[i])));
 107
 108                 if (wb_sids2xids_in_cache(&state->sids[i], &state->cached[i])) {
 109                         continue;
 110                 }
 111                 sid_copy(&state->non_cached[state->num_non_cached],
 112                          &state->sids[i]);
 113                 state->num_non_cached += 1;
 114         }
 115
 116         if (state->num_non_cached == 0) {
 117                 tevent_req_done(req);
 118                 return tevent_req_post(req, ev);
 119         }
 120
 121         subreq = wb_lookupsids_send(state, ev, state->non_cached,
 122                                     state->num_non_cached);
 123         if (tevent_req_nomem(subreq, req)) {
 124                 return tevent_req_post(req, ev);
 125         }
 126         tevent_req_set_callback(subreq, wb_sids2xids_lookupsids_done, req);
 127         return req;
 128 }
 129
 130 static bool wb_sids2xids_in_cache(struct dom_sid *sid, struct id_map *map)
 131 {
 132         struct unixid id;
 133         bool expired;
 134
 135         if (!winbindd_use_idmap_cache()) {
 136                 return false;
 137         }
 138         if (idmap_cache_find_sid2unixid(sid, &id, &expired)) {
 139                 if (expired && is_domain_online(find_our_domain())) {
 140                         return false;
 141                 }
 142                 map->sid = sid;
 143                 map->xid = id;
 144                 map->status = ID_MAPPED;
 145                 return true;
 146         }
 147         return false;
 148 }
 149
 150 static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type);
 151
 152 static void wb_sids2xids_lookupsids_done(struct tevent_req *subreq)
 153 {
 154         struct tevent_req *req = tevent_req_callback_data(
 155                 subreq, struct tevent_req);
 156         struct wb_sids2xids_state *state = tevent_req_data(
 157                 req, struct wb_sids2xids_state);
 158         struct lsa_RefDomainList *domains = NULL;
 159         struct lsa_TransNameArray *names = NULL;
 160         struct winbindd_child *child;
 161         NTSTATUS status;
 162         int i;
 163
 164         status = wb_lookupsids_recv(subreq, state, &domains, &names);
 165         TALLOC_FREE(subreq);
 166         if (tevent_req_nterror(req, status)) {
 167                 return;
 168         }
 169
 170         state->ids.num_ids = state->num_non_cached;
 171         state->ids.ids = talloc_array(state, struct wbint_TransID,
 172                                       state->num_non_cached);
 173         if (tevent_req_nomem(state->ids.ids, req)) {
 174                 return;
 175         }
 176
 177         state->idmap_doms = talloc_zero(state, struct lsa_RefDomainList);
 178         if (tevent_req_nomem(state->idmap_doms, req)) {
 179                 return;
 180         }
 181
 182         for (i=0; i<state->num_non_cached; i++) {
 183                 struct dom_sid dom_sid;
 184                 struct lsa_DomainInfo *info;
 185                 struct lsa_TranslatedName *n = &names->names[i];
 186                 struct wbint_TransID *t = &state->ids.ids[i];
 187
 188                 sid_copy(&dom_sid, &state->non_cached[i]);
 189                 sid_split_rid(&dom_sid, &t->rid);
 190
 191                 info = &domains->domains[n->sid_index];
 192                 t->type = lsa_SidType_to_id_type(n->sid_type);
 193                 t->domain_index = init_lsa_ref_domain_list(state,
 194                                                            state->idmap_doms,
 195                                                            info->name.string,
 196                                                            &dom_sid);
 197                 t->xid.id = UINT32_MAX;
 198                 t->xid.type = t->type;
 199         }
 200
 201         TALLOC_FREE(names);
 202         TALLOC_FREE(domains);
 203
 204         child = idmap_child();
 205
 206         subreq = dcerpc_wbint_Sids2UnixIDs_send(
 207                 state, state->ev, child->binding_handle, state->idmap_doms,
 208                 &state->ids);
 209         if (tevent_req_nomem(subreq, req)) {
 210                 return;
 211         }
 212         tevent_req_set_callback(subreq, wb_sids2xids_done, req);
 213 }
 214
 215 static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type)
 216 {
 217         enum id_type type;
 218
 219         switch(sid_type) {
 220         case SID_NAME_COMPUTER:
 221         case SID_NAME_USER:
 222                 type = ID_TYPE_UID;
 223                 break;
 224         case SID_NAME_DOM_GRP:
 225         case SID_NAME_ALIAS:
 226         case SID_NAME_WKN_GRP:
 227                 type = ID_TYPE_GID;
 228                 break;
 229         default:
 230                 type = ID_TYPE_NOT_SPECIFIED;
 231                 break;
 232         }
 233
 234         return type;
 235 }
 236
 237
 238 static void wb_sids2xids_done(struct tevent_req *subreq)
 239 {
 240         struct tevent_req *req = tevent_req_callback_data(
 241                 subreq, struct tevent_req);
 242         struct wb_sids2xids_state *state = tevent_req_data(
 243                 req, struct wb_sids2xids_state);
 244         NTSTATUS status, result;
 245
 246         status = dcerpc_wbint_Sids2UnixIDs_recv(subreq, state, &result);
 247         TALLOC_FREE(subreq);
 248         if (any_nt_status_not_ok(status, result, &status)) {
 249                 tevent_req_nterror(req, status);
 250                 return;
 251         }
 252         tevent_req_done(req);
 253 }
 254
 255 NTSTATUS wb_sids2xids_recv(struct tevent_req *req,
 256                            struct unixid *xids)
 257 {
 258         struct wb_sids2xids_state *state = tevent_req_data(
 259                 req, struct wb_sids2xids_state);
 260         NTSTATUS status;
 261         uint32_t i, num_non_cached;
 262
 263         if (tevent_req_is_nterror(req, &status)) {
 264                 DEBUG(5, ("wb_sids_to_xids failed: %s\n", nt_errstr(status)));
 265                 return status;
 266         }
 267
 268         num_non_cached = 0;
 269
 270         for (i=0; i<state->num_sids; i++) {
 271                 struct unixid xid;
 272
 273                 xid.id = UINT32_MAX;
 274
 275                 if (state->cached[i].sid != NULL) {
 276                         xid = state->cached[i].xid;
 277                 } else {
 278                         xid = state->ids.ids[num_non_cached].xid;
 279
 280                         idmap_cache_set_sid2unixid(
 281                                 &state->non_cached[num_non_cached],
 282                                 &xid);
 283
 284                         num_non_cached += 1;
 285                 }
 286
 287                 xids[i] = xid;
 288         }
 289
 290         return NT_STATUS_OK;
 291 }