source3/winbindd/wb_sid2gid.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    async sid2gid
   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_sid2gid_state {
  27         struct tevent_context *ev;
  28         struct dom_sid sid;
  29         char *dom_name;
  30         uint64 gid64;
  31         gid_t gid;
  32 };
  33
  34 static void wb_sid2gid_lookup_done(struct tevent_req *subreq);
  35 static void wb_sid2gid_done(struct tevent_req *subreq);
  36
  37
  38 struct tevent_req *wb_sid2gid_send(TALLOC_CTX *mem_ctx,
  39                                    struct tevent_context *ev,
  40                                    const struct dom_sid *sid)
  41 {
  42         struct tevent_req *req, *subreq;
  43         struct wb_sid2gid_state *state;
  44         bool expired;
  45
  46         req = tevent_req_create(mem_ctx, &state, struct wb_sid2gid_state);
  47         if (req == NULL) {
  48                 return NULL;
  49         }
  50         sid_copy(&state->sid, sid);
  51         state->ev = ev;
  52
  53         if (winbindd_use_idmap_cache()
  54             && idmap_cache_find_sid2gid(sid, &state->gid, &expired)) {
  55
  56                 DEBUG(10, ("idmap_cache_find_sid2gid found %d%s\n",
  57                            (int)state->gid, expired ? " (expired)": ""));
  58
  59                 if (!expired || is_domain_offline(find_our_domain())) {
  60                         if (state->gid == -1) {
  61                                 tevent_req_nterror(req, NT_STATUS_NONE_MAPPED);
  62                         } else {
  63                                 tevent_req_done(req);
  64                         }
  65                         return tevent_req_post(req, ev);
  66                 }
  67         }
  68
  69         /*
  70          * We need to make sure the sid is of the right type to not flood
  71          * idmap with wrong entries
  72          */
  73
  74         subreq = wb_lookupsid_send(state, ev, &state->sid);
  75         if (tevent_req_nomem(subreq, req)) {
  76                 return tevent_req_post(req, ev);
  77         }
  78         tevent_req_set_callback(subreq, wb_sid2gid_lookup_done, req);
  79         return req;
  80 }
  81
  82 static void wb_sid2gid_lookup_done(struct tevent_req *subreq)
  83 {
  84         struct tevent_req *req = tevent_req_callback_data(
  85                 subreq, struct tevent_req);
  86         struct wb_sid2gid_state *state = tevent_req_data(
  87                 req, struct wb_sid2gid_state);
  88         struct winbindd_domain *domain;
  89         const char *domname;
  90         const char *name;
  91         enum lsa_SidType type;
  92         NTSTATUS status;
  93         struct winbindd_child *child;
  94
  95         status = wb_lookupsid_recv(subreq, talloc_tos(), &type, &domname,
  96                                    &name);
  97         if (tevent_req_nterror(req, status)) {
  98                 return;
  99         }
 100
 101         if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS)
 102             && (type != SID_NAME_WKN_GRP)) {
 103                 DEBUG(5, ("Sid %s is not a group.\n",
 104                           sid_string_dbg(&state->sid)));
 105                 /*
 106                  * We have to set the cache ourselves here, the child
 107                  * which is normally responsible was not queried yet.
 108                  */
 109                 idmap_cache_set_sid2gid(&state->sid, -1);
 110                 tevent_req_nterror(req, NT_STATUS_INVALID_SID);
 111                 return;
 112         }
 113
 114         domain = find_domain_from_sid_noinit(&state->sid);
 115
 116         /*
 117          * TODO: Issue a gettrustinfo here in case we don't have "domain" yet?
 118          */
 119
 120         if ((domain != NULL) && domain->have_idmap_config) {
 121                 state->dom_name = domain->name;
 122         } else {
 123                 state->dom_name = NULL;
 124         }
 125
 126         child = idmap_child();
 127
 128         subreq = dcerpc_wbint_Sid2Gid_send(state, state->ev, child->binding_handle,
 129                                            state->dom_name, &state->sid,
 130                                            &state->gid64);
 131         if (tevent_req_nomem(subreq, req)) {
 132                 return;
 133         }
 134         tevent_req_set_callback(subreq, wb_sid2gid_done, req);
 135 }
 136
 137 static void wb_sid2gid_done(struct tevent_req *subreq)
 138 {
 139         struct tevent_req *req = tevent_req_callback_data(
 140                 subreq, struct tevent_req);
 141         struct wb_sid2gid_state *state = tevent_req_data(
 142                 req, struct wb_sid2gid_state);
 143         NTSTATUS status, result;
 144
 145         status = dcerpc_wbint_Sid2Gid_recv(subreq, state, &result);
 146         TALLOC_FREE(subreq);
 147         if (any_nt_status_not_ok(status, result, &status)) {
 148                 tevent_req_nterror(req, status);
 149                 return;
 150         }
 151
 152         state->gid = state->gid64;
 153         tevent_req_done(req);
 154 }
 155
 156 NTSTATUS wb_sid2gid_recv(struct tevent_req *req, gid_t *gid)
 157 {
 158         struct wb_sid2gid_state *state = tevent_req_data(
 159                 req, struct wb_sid2gid_state);
 160         NTSTATUS status;
 161
 162         if (tevent_req_is_nterror(req, &status)) {
 163                 return status;
 164         }
 165         *gid = state->gid;
 166         return NT_STATUS_OK;
 167 }