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/ndr_wbint_c.h"
  23 #include "idmap_cache.h"
  24 #include "../libcli/security/security.h"
  25
  26 struct wb_sid2uid_state {
  27         struct tevent_context *ev;
  28         struct dom_sid sid;
  29         char *dom_name;
  30         uint64 uid64;
  31         uid_t uid;
  32 };
  33
  34 static void wb_sid2uid_lookup_done(struct tevent_req *subreq);
  35 static void wb_sid2uid_done(struct tevent_req *subreq);
  36
  37 struct tevent_req *wb_sid2uid_send(TALLOC_CTX *mem_ctx,
  38                                    struct tevent_context *ev,
  39                                    const struct dom_sid *sid)
  40 {
  41         struct tevent_req *req, *subreq;
  42         struct wb_sid2uid_state *state;
  43         bool expired;
  44
  45         req = tevent_req_create(mem_ctx, &state, struct wb_sid2uid_state);
  46         if (req == NULL) {
  47                 return NULL;
  48         }
  49         sid_copy(&state->sid, sid);
  50         state->ev = ev;
  51
  52         if (winbindd_use_idmap_cache()
  53             && idmap_cache_find_sid2uid(sid, &state->uid, &expired)) {
  54
  55                 DEBUG(10, ("idmap_cache_find_sid2uid found %d%s\n",
  56                            (int)state->uid, expired ? " (expired)": ""));
  57
  58                 if (!expired || is_domain_offline(find_our_domain())) {
  59                         if (state->uid == -1) {
  60                                 tevent_req_nterror(req, NT_STATUS_NONE_MAPPED);
  61                         } else {
  62                                 tevent_req_done(req);
  63                         }
  64                         return tevent_req_post(req, ev);
  65                 }
  66         }
  67
  68         /*
  69          * We need to make sure the sid is of the right type to not flood
  70          * idmap with wrong entries
  71          */
  72
  73         subreq = wb_lookupsid_send(state, ev, &state->sid);
  74         if (tevent_req_nomem(subreq, req)) {
  75                 return tevent_req_post(req, ev);
  76         }
  77         tevent_req_set_callback(subreq, wb_sid2uid_lookup_done, req);
  78         return req;
  79 }
  80
  81 static void wb_sid2uid_lookup_done(struct tevent_req *subreq)
  82 {
  83         struct tevent_req *req = tevent_req_callback_data(
  84                 subreq, struct tevent_req);
  85         struct wb_sid2uid_state *state = tevent_req_data(
  86                 req, struct wb_sid2uid_state);
  87         struct winbindd_domain *domain;
  88         const char *domname;
  89         const char *name;
  90         enum lsa_SidType type;
  91         NTSTATUS status;
  92         struct winbindd_child *child;
  93
  94         status = wb_lookupsid_recv(subreq, talloc_tos(), &type, &domname,
  95                                    &name);
  96         if (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 (any_nt_status_not_ok(status, result, &status)) {
 146                 tevent_req_nterror(req, status);
 147                 return;
 148         }
 149
 150         state->uid = state->uid64;
 151         tevent_req_done(req);
 152 }
 153
 154 NTSTATUS wb_sid2uid_recv(struct tevent_req *req, uid_t *uid)
 155 {
 156         struct wb_sid2uid_state *state = tevent_req_data(
 157                 req, struct wb_sid2uid_state);
 158         NTSTATUS status;
 159
 160         if (tevent_req_is_nterror(req, &status)) {
 161                 return status;
 162         }
 163         *uid = state->uid;
 164         return NT_STATUS_OK;
 165 }