source3/winbindd/wb_sid2uid.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    async sid2uid
   4    Copyright (C) Volker Lendecke 2009
   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 "librpc/gen_ndr/cli_wbint.h"
  23
  24 struct wb_sid2uid_state {
  25         struct tevent_context *ev;
  26         struct dom_sid sid;
  27         char *dom_name;
  28         uint64 uid64;
  29         uid_t uid;
  30 };
  31
  32 static void wb_sid2uid_lookup_done(struct tevent_req *subreq);
  33 static void wb_sid2uid_done(struct tevent_req *subreq);
  34
  35 struct tevent_req *wb_sid2uid_send(TALLOC_CTX *mem_ctx,
  36                                    struct tevent_context *ev,
  37                                    const struct dom_sid *sid)
  38 {
  39         struct tevent_req *req, *subreq;
  40         struct wb_sid2uid_state *state;
  41         bool expired;
  42
  43         req = tevent_req_create(mem_ctx, &state, struct wb_sid2uid_state);
  44         if (req == NULL) {
  45                 return NULL;
  46         }
  47         sid_copy(&state->sid, sid);
  48         state->ev = ev;
  49
  50         if (winbindd_use_idmap_cache()
  51             && idmap_cache_find_sid2uid(sid, &state->uid, &expired)) {
  52
  53                 DEBUG(10, ("idmap_cache_find_sid2uid found %d%s\n",
  54                            (int)state->uid, expired ? " (expired)": ""));
  55
  56                 if (!expired || is_domain_offline(find_our_domain())) {
  57                         if (state->uid == -1) {
  58                                 tevent_req_nterror(req, NT_STATUS_NONE_MAPPED);
  59                         } else {
  60                                 tevent_req_done(req);
  61                         }
  62                         return tevent_req_post(req, ev);
  63                 }
  64         }
  65
  66         /*
  67          * We need to make sure the sid is of the right type to not flood
  68          * idmap with wrong entries
  69          */
  70
  71         subreq = wb_lookupsid_send(state, ev, &state->sid);
  72         if (tevent_req_nomem(subreq, req)) {
  73                 return tevent_req_post(req, ev);
  74         }
  75         tevent_req_set_callback(subreq, wb_sid2uid_lookup_done, req);
  76         return req;
  77 }
  78
  79 static void wb_sid2uid_lookup_done(struct tevent_req *subreq)
  80 {
  81         struct tevent_req *req = tevent_req_callback_data(
  82                 subreq, struct tevent_req);
  83         struct wb_sid2uid_state *state = tevent_req_data(
  84                 req, struct wb_sid2uid_state);
  85         struct winbindd_domain *domain;
  86         const char *domname;
  87         const char *name;
  88         enum lsa_SidType type;
  89         NTSTATUS status;
  90         struct winbindd_child *child;
  91
  92         status = wb_lookupsid_recv(subreq, talloc_tos(), &type, &domname,
  93                                    &name);
  94         if (!NT_STATUS_IS_OK(status)) {
  95                 tevent_req_nterror(req, status);
  96                 return;
  97         }
  98
  99         if ((type != SID_NAME_USER) && (type != SID_NAME_COMPUTER)) {
 100                 DEBUG(5, ("Sid %s is not a user or a computer.\n",
 101                           sid_string_dbg(&state->sid)));
 102                 /*
 103                  * We have to set the cache ourselves here, the child
 104                  * which is normally responsible was not queried yet.
 105                  */
 106                 idmap_cache_set_sid2uid(&state->sid, -1);
 107                 tevent_req_nterror(req, NT_STATUS_INVALID_SID);
 108                 return;
 109         }
 110
 111         domain = find_domain_from_sid_noinit(&state->sid);
 112
 113         /*
 114          * TODO: Issue a gettrustinfo here in case we don't have "domain" yet?
 115          */
 116
 117         if ((domain != NULL) && domain->have_idmap_config) {
 118                 state->dom_name = domain->name;
 119         } else {
 120                 state->dom_name = NULL;
 121         }
 122
 123         child = idmap_child();
 124
 125         subreq = rpccli_wbint_Sid2Uid_send(state, state->ev, child->rpccli,
 126                                            state->dom_name, &state->sid,
 127                                            &state->uid64);
 128         if (tevent_req_nomem(subreq, req)) {
 129                 return;
 130         }
 131         tevent_req_set_callback(subreq, wb_sid2uid_done, req);
 132 }
 133
 134 static void wb_sid2uid_done(struct tevent_req *subreq)
 135 {
 136         struct tevent_req *req = tevent_req_callback_data(
 137                 subreq, struct tevent_req);
 138         struct wb_sid2uid_state *state = tevent_req_data(
 139                 req, struct wb_sid2uid_state);
 140         NTSTATUS status, result;
 141
 142         status = rpccli_wbint_Sid2Uid_recv(subreq, state, &result);
 143         TALLOC_FREE(subreq);
 144         if (!NT_STATUS_IS_OK(status)) {
 145                 tevent_req_nterror(req, status);
 146                 return;
 147         }
 148         if (!NT_STATUS_IS_OK(result)) {
 149                 tevent_req_nterror(req, result);
 150                 return;
 151         }
 152
 153         state->uid = state->uid64;
 154         tevent_req_done(req);
 155 }
 156
 157 NTSTATUS wb_sid2uid_recv(struct tevent_req *req, uid_t *uid)
 158 {
 159         struct wb_sid2uid_state *state = tevent_req_data(
 160                 req, struct wb_sid2uid_state);
 161         NTSTATUS status;
 162
 163         if (tevent_req_is_nterror(req, &status)) {
 164                 return status;
 165         }
 166         *uid = state->uid;
 167         return NT_STATUS_OK;
 168 }