source3/winbindd/winbindd_getgroups.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    async implementation of WINBINDD_GETGROUPS
   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 "passdb/lookup_sid.h" /* only for LOOKUP_NAME_NO_NSS flag */
  23
  24 struct winbindd_getgroups_state {
  25         struct tevent_context *ev;
  26         fstring namespace;
  27         fstring domname;
  28         fstring username;
  29         struct dom_sid sid;
  30         enum lsa_SidType type;
  31         int num_sids;
  32         struct dom_sid *sids;
  33         int num_gids;
  34         gid_t *gids;
  35 };
  36
  37 static void winbindd_getgroups_lookupname_done(struct tevent_req *subreq);
  38 static void winbindd_getgroups_gettoken_done(struct tevent_req *subreq);
  39 static void winbindd_getgroups_sid2gid_done(struct tevent_req *subreq);
  40
  41 struct tevent_req *winbindd_getgroups_send(TALLOC_CTX *mem_ctx,
  42                                            struct tevent_context *ev,
  43                                            struct winbindd_cli_state *cli,
  44                                            struct winbindd_request *request)
  45 {
  46         struct tevent_req *req, *subreq;
  47         struct winbindd_getgroups_state *state;
  48         char *domuser, *mapped_user;
  49         NTSTATUS status;
  50         bool ok;
  51
  52         req = tevent_req_create(mem_ctx, &state,
  53                                 struct winbindd_getgroups_state);
  54         if (req == NULL) {
  55                 return NULL;
  56         }
  57         state->ev = ev;
  58
  59         /* Ensure null termination */
  60         request->data.username[sizeof(request->data.username)-1]='\0';
  61
  62         DEBUG(3, ("getgroups %s\n", request->data.username));
  63
  64         domuser = request->data.username;
  65
  66         status = normalize_name_unmap(state, domuser, &mapped_user);
  67
  68         if (NT_STATUS_IS_OK(status)
  69             || NT_STATUS_EQUAL(status, NT_STATUS_FILE_RENAMED)) {
  70                 /* normalize_name_unmapped did something */
  71                 domuser = mapped_user;
  72         }
  73
  74         ok = parse_domain_user(domuser,
  75                                state->namespace,
  76                                state->domname,
  77                                state->username);
  78         if (!ok) {
  79                 DEBUG(5, ("Could not parse domain user: %s\n", domuser));
  80                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
  81                 return tevent_req_post(req, ev);
  82         }
  83
  84         subreq = wb_lookupname_send(state, ev,
  85                                     state->namespace,
  86                                     state->domname,
  87                                     state->username,
  88                                     LOOKUP_NAME_NO_NSS);
  89         if (tevent_req_nomem(subreq, req)) {
  90                 return tevent_req_post(req, ev);
  91         }
  92         tevent_req_set_callback(subreq, winbindd_getgroups_lookupname_done,
  93                                 req);
  94         return req;
  95 }
  96
  97 static void winbindd_getgroups_lookupname_done(struct tevent_req *subreq)
  98 {
  99         struct tevent_req *req = tevent_req_callback_data(
 100                 subreq, struct tevent_req);
 101         struct winbindd_getgroups_state *state = tevent_req_data(
 102                 req, struct winbindd_getgroups_state);
 103         NTSTATUS status;
 104
 105         status = wb_lookupname_recv(subreq, &state->sid, &state->type);
 106         TALLOC_FREE(subreq);
 107         if (tevent_req_nterror(req, status)) {
 108                 return;
 109         }
 110
 111         subreq = wb_gettoken_send(state, state->ev, &state->sid, true);
 112         if (tevent_req_nomem(subreq, req)) {
 113                 return;
 114         }
 115         tevent_req_set_callback(subreq, winbindd_getgroups_gettoken_done, req);
 116 }
 117
 118 static void winbindd_getgroups_gettoken_done(struct tevent_req *subreq)
 119 {
 120         struct tevent_req *req = tevent_req_callback_data(
 121                 subreq, struct tevent_req);
 122         struct winbindd_getgroups_state *state = tevent_req_data(
 123                 req, struct winbindd_getgroups_state);
 124         NTSTATUS status;
 125
 126         status = wb_gettoken_recv(subreq, state, &state->num_sids,
 127                                   &state->sids);
 128         TALLOC_FREE(subreq);
 129         if (tevent_req_nterror(req, status)) {
 130                 return;
 131         }
 132
 133         /*
 134          * Convert the group SIDs to gids. state->sids[0] contains the user
 135          * sid. If the idmap backend uses ID_TYPE_BOTH, we might need the
 136          * the id of the user sid in the list of group sids, so map the
 137          * complete token.
 138          */
 139
 140         subreq = wb_sids2xids_send(state, state->ev,
 141                                    state->sids, state->num_sids);
 142         if (tevent_req_nomem(subreq, req)) {
 143                 return;
 144         }
 145         tevent_req_set_callback(subreq, winbindd_getgroups_sid2gid_done, req);
 146 }
 147
 148 static void winbindd_getgroups_sid2gid_done(struct tevent_req *subreq)
 149 {
 150         struct tevent_req *req = tevent_req_callback_data(
 151                 subreq, struct tevent_req);
 152         struct winbindd_getgroups_state *state = tevent_req_data(
 153                 req, struct winbindd_getgroups_state);
 154         NTSTATUS status;
 155         struct unixid *xids;
 156         int i;
 157
 158         xids = talloc_array(state, struct unixid, state->num_sids);
 159         if (tevent_req_nomem(xids, req)) {
 160                 return;
 161         }
 162         for (i=0; i < state->num_sids; i++) {
 163                 xids[i].type = ID_TYPE_NOT_SPECIFIED;
 164                 xids[i].id = UINT32_MAX;
 165         }
 166
 167         status = wb_sids2xids_recv(subreq, xids, state->num_sids);
 168         TALLOC_FREE(subreq);
 169         if (NT_STATUS_EQUAL(status, NT_STATUS_NONE_MAPPED) ||
 170             NT_STATUS_EQUAL(status, STATUS_SOME_UNMAPPED))
 171         {
 172                 status = NT_STATUS_OK;
 173         }
 174         if (tevent_req_nterror(req, status)) {
 175                 return;
 176         }
 177
 178         state->gids = talloc_array(state, gid_t, state->num_sids);
 179         if (tevent_req_nomem(state->gids, req)) {
 180                 return;
 181         }
 182         state->num_gids = 0;
 183
 184         for (i=0; i < state->num_sids; i++) {
 185                 bool include_gid = false;
 186                 const char *debug_missing = NULL;
 187
 188                 switch (xids[i].type) {
 189                 case ID_TYPE_NOT_SPECIFIED:
 190                         debug_missing = "not specified";
 191                         break;
 192                 case ID_TYPE_UID:
 193                         if (i != 0) {
 194                                 debug_missing = "uid";
 195                         }
 196                         break;
 197                 case ID_TYPE_GID:
 198                 case ID_TYPE_BOTH:
 199                         include_gid = true;
 200                         break;
 201                 }
 202
 203                 if (!include_gid) {
 204                         if (debug_missing == NULL) {
 205                                 continue;
 206                         }
 207
 208                         DEBUG(10, ("WARNING: skipping unix id (%u) for sid %s "
 209                                    "from group list because the idmap type "
 210                                    "is %s. "
 211                                    "This might be a security problem when ACLs "
 212                                    "contain DENY ACEs!\n",
 213                                    (unsigned)xids[i].id,
 214                                    sid_string_tos(&state->sids[i]),
 215                                    debug_missing));
 216                         continue;
 217                 }
 218
 219                 state->gids[state->num_gids] = (gid_t)xids[i].id;
 220                 state->num_gids += 1;
 221         }
 222
 223         /*
 224          * This should not fail, as it does not do any reallocation,
 225          * just updating the talloc size.
 226          */
 227         state->gids = talloc_realloc(state, state->gids, gid_t, state->num_gids);
 228         if (tevent_req_nomem(state->gids, req)) {
 229                 return;
 230         }
 231
 232         tevent_req_done(req);
 233 }
 234
 235 NTSTATUS winbindd_getgroups_recv(struct tevent_req *req,
 236                                  struct winbindd_response *response)
 237 {
 238         struct winbindd_getgroups_state *state = tevent_req_data(
 239                 req, struct winbindd_getgroups_state);
 240         NTSTATUS status;
 241
 242         if (tevent_req_is_nterror(req, &status)) {
 243                 DEBUG(5, ("Could not convert sid %s: %s\n",
 244                           sid_string_dbg(&state->sid), nt_errstr(status)));
 245                 return status;
 246         }
 247
 248         response->data.num_entries = state->num_gids;
 249
 250         if (state->num_gids > 0) {
 251                 response->extra_data.data = talloc_move(response,
 252                                                         &state->gids);
 253                 response->length += state->num_gids * sizeof(gid_t);
 254         }
 255         return NT_STATUS_OK;
 256 }