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