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 #include "idmap_cache.h"
  24
  25 struct wb_sid2uid_state {
  26         struct tevent_context *ev;
  27         struct dom_sid sid;
  28         char *dom_name;
  29         uint64 uid64;
  30         uid_t uid;
  31 };
  32
  33 static void wb_sid2uid_lookup_done(struct tevent_req *subreq);
  34 static void wb_sid2uid_done(struct tevent_req *subreq);
  35
  36 struct tevent_req *wb_sid2uid_send(TALLOC_CTX *mem_ctx,
  37                                    struct tevent_context *ev,
  38                                    const struct dom_sid *sid)
  39 {
  40         struct tevent_req *req, *subreq;
  41         struct wb_sid2uid_state *state;
  42         bool expired;
  43
  44         req = tevent_req_create(mem_ctx, &state, struct wb_sid2uid_state);
  45         if (req == NULL) {
  46                 return NULL;
  47         }
  48         sid_copy(&state->sid, sid);
  49         state->ev = ev;
  50
  51         if (winbindd_use_idmap_cache()
  52             && idmap_cache_find_sid2uid(sid, &state->uid, &expired)) {
  53
  54                 DEBUG(10, ("idmap_cache_find_sid2uid found %d%s\n",
  55                            (int)state->uid, expired ? " (expired)": ""));
  56
  57                 if (!expired || is_domain_offline(find_our_domain())) {
  58                         if (state->uid == -1) {
  59                                 tevent_req_nterror(req, NT_STATUS_NONE_MAPPED);
  60                         } else {
  61                                 tevent_req_done(req);
  62                         }
  63                         return tevent_req_post(req, ev);
  64                 }
  65         }
  66
  67         /*
  68          * We need to make sure the sid is of the right type to not flood
  69          * idmap with wrong entries
  70          */
  71
  72         subreq = wb_lookupsid_send(state, ev, &state->sid);
  73         if (tevent_req_nomem(subreq, req)) {
  74                 return tevent_req_post(req, ev);
  75         }
  76         tevent_req_set_callback(subreq, wb_sid2uid_lookup_done, req);
  77         return req;
  78 }
  79
  80 static void wb_sid2uid_lookup_done(struct tevent_req *subreq)
  81 {
  82         struct tevent_req *req = tevent_req_callback_data(
  83                 subreq, struct tevent_req);
  84         struct wb_sid2uid_state *state = tevent_req_data(
  85                 req, struct wb_sid2uid_state);
  86         struct winbindd_domain *domain;
  87         const char *domname;
  88         const char *name;
  89         enum lsa_SidType type;
  90         NTSTATUS status;
  91         struct winbindd_child *child;
  92
  93         status = wb_lookupsid_recv(subreq, talloc_tos(), &type, &domname,
  94                                    &name);
  95         if (!NT_STATUS_IS_OK(status)) {
  96                 tevent_req_nterror(req, status);
  97                 return;
  98         }
  99
 100         if ((type != SID_NAME_USER) && (type != SID_NAME_COMPUTER)) {
 101                 DEBUG(5, ("Sid %s is not a user or a computer.\n",
 102                           sid_string_dbg(&state->sid)));
 103                 /*
 104                  * We have to set the cache ourselves here, the child
 105                  * which is normally responsible was not queried yet.
 106                  */
 107                 idmap_cache_set_sid2uid(&state->sid, -1);
 108                 tevent_req_nterror(req, NT_STATUS_INVALID_SID);
 109                 return;
 110         }
 111
 112         domain = find_domain_from_sid_noinit(&state->sid);
 113
 114         /*
 115          * TODO: Issue a gettrustinfo here in case we don't have "domain" yet?
 116          */
 117
 118         if ((domain != NULL) && domain->have_idmap_config) {
 119                 state->dom_name = domain->name;
 120         } else {
 121                 state->dom_name = NULL;
 122         }
 123
 124         child = idmap_child();
 125
 126         subreq = dcerpc_wbint_Sid2Uid_send(state, state->ev, child->binding_handle,
 127                                            state->dom_name, &state->sid,
 128                                            &state->uid64);
 129         if (tevent_req_nomem(subreq, req)) {
 130                 return;
 131         }
 132         tevent_req_set_callback(subreq, wb_sid2uid_done, req);
 133 }
 134
 135 static void wb_sid2uid_done(struct tevent_req *subreq)
 136 {
 137         struct tevent_req *req = tevent_req_callback_data(
 138                 subreq, struct tevent_req);
 139         struct wb_sid2uid_state *state = tevent_req_data(
 140                 req, struct wb_sid2uid_state);
 141         NTSTATUS status, result;
 142
 143         status = dcerpc_wbint_Sid2Uid_recv(subreq, state, &result);
 144         TALLOC_FREE(subreq);
 145         if (!NT_STATUS_IS_OK(status)) {
 146                 tevent_req_nterror(req, status);
 147                 return;
 148         }
 149         if (!NT_STATUS_IS_OK(result)) {
 150                 tevent_req_nterror(req, result);
 151                 return;
 152         }
 153
 154         state->uid = state->uid64;
 155         tevent_req_done(req);
 156 }
 157
 158 NTSTATUS wb_sid2uid_recv(struct tevent_req *req, uid_t *uid)
 159 {
 160         struct wb_sid2uid_state *state = tevent_req_data(
 161                 req, struct wb_sid2uid_state);
 162         NTSTATUS status;
 163
 164         if (tevent_req_is_nterror(req, &status)) {
 165                 return status;
 166         }
 167         *uid = state->uid;
 168         return NT_STATUS_OK;
 169 }