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         /*
  95          * Extract those sids that can not be resolved from cache
  96          * into a separate list to be handed to id mapping, keeping
  97          * the same index.
  98          */
  99         for (i=0; i<state->num_sids; i++) {
 100
 101                 DEBUG(10, ("SID %d: %s\n", (int)i,
 102                            sid_string_dbg(&state->sids[i])));
 103
 104                 if (winbindd_sids_to_xids_in_cache(&state->sids[i],
 105                                                    &state->cached[i])) {
 106                         continue;
 107                 }
 108                 sid_copy(&state->non_cached[state->num_non_cached],
 109                          &state->sids[i]);
 110                 state->num_non_cached += 1;
 111         }
 112
 113         if (state->num_non_cached == 0) {
 114                 tevent_req_done(req);
 115                 return tevent_req_post(req, ev);
 116         }
 117
 118         subreq = wb_lookupsids_send(state, ev, state->non_cached,
 119                                     state->num_non_cached);
 120         if (tevent_req_nomem(subreq, req)) {
 121                 return tevent_req_post(req, ev);
 122         }
 123         tevent_req_set_callback(subreq, winbindd_sids_to_xids_lookupsids_done,
 124                                 req);
 125         return req;
 126 }
 127
 128 static bool winbindd_sids_to_xids_in_cache(struct dom_sid *sid,
 129                                            struct id_map *map)
 130 {
 131         struct unixid id;
 132         bool expired;
 133
 134         if (!winbindd_use_idmap_cache()) {
 135                 return false;
 136         }
 137         if (idmap_cache_find_sid2unixid(sid, &id, &expired)) {
 138                 if (expired && is_domain_online(find_our_domain())) {
 139                         return false;
 140                 }
 141                 map->sid = sid;
 142                 map->xid = id;
 143                 map->status = ID_MAPPED;
 144                 return true;
 145         }
 146         return false;
 147 }
 148
 149 static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type);
 150
 151 static void winbindd_sids_to_xids_lookupsids_done(struct tevent_req *subreq)
 152 {
 153         struct tevent_req *req = tevent_req_callback_data(
 154                 subreq, struct tevent_req);
 155         struct winbindd_sids_to_xids_state *state = tevent_req_data(
 156                 req, struct winbindd_sids_to_xids_state);
 157         struct winbindd_child *child;
 158         NTSTATUS status;
 159         int i;
 160
 161         status = wb_lookupsids_recv(subreq, state, &state->domains,
 162                                     &state->names);
 163         TALLOC_FREE(subreq);
 164         if (tevent_req_nterror(req, status)) {
 165                 return;
 166         }
 167
 168         state->ids.num_ids = state->num_non_cached;
 169         state->ids.ids = talloc_array(state, struct wbint_TransID,
 170                                       state->num_non_cached);
 171         if (tevent_req_nomem(state->ids.ids, req)) {
 172                 return;
 173         }
 174
 175         for (i=0; i<state->num_non_cached; i++) {
 176                 struct lsa_TranslatedName *n = &state->names->names[i];
 177                 struct wbint_TransID *t = &state->ids.ids[i];
 178
 179                 t->type = lsa_SidType_to_id_type(n->sid_type);
 180                 t->domain_index = n->sid_index;
 181                 sid_peek_rid(&state->non_cached[i], &t->rid);
 182                 t->unix_id = (uint64_t)-1;
 183         }
 184
 185         child = idmap_child();
 186
 187         subreq = dcerpc_wbint_Sids2UnixIDs_send(
 188                 state, state->ev, child->binding_handle, state->domains,
 189                 &state->ids);
 190         if (tevent_req_nomem(subreq, req)) {
 191                 return;
 192         }
 193         tevent_req_set_callback(subreq, winbindd_sids_to_xids_done, req);
 194 }
 195
 196 static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type)
 197 {
 198         enum id_type type;
 199
 200         switch(sid_type) {
 201         case SID_NAME_COMPUTER:
 202         case SID_NAME_USER:
 203                 type = ID_TYPE_UID;
 204                 break;
 205         case SID_NAME_DOM_GRP:
 206         case SID_NAME_ALIAS:
 207         case SID_NAME_WKN_GRP:
 208                 type = ID_TYPE_GID;
 209                 break;
 210         default:
 211                 type = ID_TYPE_NOT_SPECIFIED;
 212                 break;
 213         }
 214
 215         return type;
 216 }
 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 = NULL;
 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 = '\0';
 259                 bool found = true;
 260                 struct unixid xid;
 261
 262                 xid.id = UINT32_MAX;
 263
 264                 if (state->cached[i].sid != NULL) {
 265                         xid = state->cached[i].xid;
 266                 } else {
 267                         xid.id = state->ids.ids[num_non_cached].unix_id;
 268                         xid.type = state->ids.ids[num_non_cached].type;
 269
 270                         idmap_cache_set_sid2unixid(
 271                                 &state->non_cached[num_non_cached],
 272                                 &xid);
 273
 274                         num_non_cached += 1;
 275                 }
 276
 277                 switch (xid.type) {
 278                 case ID_TYPE_UID:
 279                         type = 'U';
 280                         break;
 281                 case ID_TYPE_GID:
 282                         type = 'G';
 283                         break;
 284                 case ID_TYPE_BOTH:
 285                         type = 'B';
 286                         break;
 287                 default:
 288                         found = false;
 289                         break;
 290                 }
 291
 292                 if (xid.id == UINT32_MAX) {
 293                         found = false;
 294                 }
 295
 296                 if (found) {
 297                         result = talloc_asprintf_append_buffer(
 298                                 result, "%c%lu\n", type,
 299                                 (unsigned long)xid.id);
 300                 } else {
 301                         result = talloc_asprintf_append_buffer(result, "\n");
 302                 }
 303                 if (result == NULL) {
 304                         return NT_STATUS_NO_MEMORY;
 305                 }
 306         }
 307
 308         response->extra_data.data = result;
 309         response->length += talloc_get_size(result);
 310         return NT_STATUS_OK;
 311 }