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 #include "libcli/security/dom_sid.h"
  24
  25 struct winbindd_getgroups_state {
  26         struct tevent_context *ev;
  27         fstring namespace;
  28         fstring domname;
  29         fstring username;
  30         struct dom_sid sid;
  31         enum lsa_SidType type;
  32         int num_sids;
  33         struct dom_sid *sids;
  34         int num_gids;
  35         gid_t *gids;
  36 };
  37
  38 static void winbindd_getgroups_lookupname_done(struct tevent_req *subreq);
  39 static void winbindd_getgroups_gettoken_done(struct tevent_req *subreq);
  40 static void winbindd_getgroups_sid2gid_done(struct tevent_req *subreq);
  41
  42 struct tevent_req *winbindd_getgroups_send(TALLOC_CTX *mem_ctx,
  43                                            struct tevent_context *ev,
  44                                            struct winbindd_cli_state *cli,
  45                                            struct winbindd_request *request)
  46 {
  47         struct tevent_req *req, *subreq;
  48         struct winbindd_getgroups_state *state;
  49         char *domuser, *mapped_user;
  50         NTSTATUS status;
  51         bool ok;
  52
  53         req = tevent_req_create(mem_ctx, &state,
  54                                 struct winbindd_getgroups_state);
  55         if (req == NULL) {
  56                 return NULL;
  57         }
  58         state->ev = ev;
  59
  60         /* Ensure null termination */
  61         request->data.username[sizeof(request->data.username)-1]='\0';
  62
  63         DBG_NOTICE("[%s (%u)] getgroups %s\n",
  64                    cli->client_name,
  65                    (unsigned int)cli->pid,
  66                    request->data.username);
  67
  68         domuser = request->data.username;
  69
  70         status = normalize_name_unmap(state, domuser, &mapped_user);
  71
  72         if (NT_STATUS_IS_OK(status)
  73             || NT_STATUS_EQUAL(status, NT_STATUS_FILE_RENAMED)) {
  74                 /* normalize_name_unmapped did something */
  75                 domuser = mapped_user;
  76         }
  77
  78         ok = parse_domain_user(domuser,
  79                                state->namespace,
  80                                state->domname,
  81                                state->username);
  82         if (!ok) {
  83                 DEBUG(5, ("Could not parse domain user: %s\n", domuser));
  84                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
  85                 return tevent_req_post(req, ev);
  86         }
  87
  88         subreq = wb_lookupname_send(state, ev,
  89                                     state->namespace,
  90                                     state->domname,
  91                                     state->username,
  92                                     LOOKUP_NAME_NO_NSS);
  93         if (tevent_req_nomem(subreq, req)) {
  94                 return tevent_req_post(req, ev);
  95         }
  96         tevent_req_set_callback(subreq, winbindd_getgroups_lookupname_done,
  97                                 req);
  98         return req;
  99 }
 100
 101 static void winbindd_getgroups_lookupname_done(struct tevent_req *subreq)
 102 {
 103         struct tevent_req *req = tevent_req_callback_data(
 104                 subreq, struct tevent_req);
 105         struct winbindd_getgroups_state *state = tevent_req_data(
 106                 req, struct winbindd_getgroups_state);
 107         NTSTATUS status;
 108
 109         status = wb_lookupname_recv(subreq, &state->sid, &state->type);
 110         TALLOC_FREE(subreq);
 111         if (tevent_req_nterror(req, status)) {
 112                 return;
 113         }
 114
 115         subreq = wb_gettoken_send(state, state->ev, &state->sid, true);
 116         if (tevent_req_nomem(subreq, req)) {
 117                 return;
 118         }
 119         tevent_req_set_callback(subreq, winbindd_getgroups_gettoken_done, req);
 120 }
 121
 122 static void winbindd_getgroups_gettoken_done(struct tevent_req *subreq)
 123 {
 124         struct tevent_req *req = tevent_req_callback_data(
 125                 subreq, struct tevent_req);
 126         struct winbindd_getgroups_state *state = tevent_req_data(
 127                 req, struct winbindd_getgroups_state);
 128         NTSTATUS status;
 129
 130         status = wb_gettoken_recv(subreq, state, &state->num_sids,
 131                                   &state->sids);
 132         TALLOC_FREE(subreq);
 133         if (tevent_req_nterror(req, status)) {
 134                 return;
 135         }
 136
 137         /*
 138          * Convert the group SIDs to gids. state->sids[0] contains the user
 139          * sid. If the idmap backend uses ID_TYPE_BOTH, we might need the
 140          * the id of the user sid in the list of group sids, so map the
 141          * complete token.
 142          */
 143
 144         subreq = wb_sids2xids_send(state, state->ev,
 145                                    state->sids, state->num_sids);
 146         if (tevent_req_nomem(subreq, req)) {
 147                 return;
 148         }
 149         tevent_req_set_callback(subreq, winbindd_getgroups_sid2gid_done, req);
 150 }
 151
 152 static void winbindd_getgroups_sid2gid_done(struct tevent_req *subreq)
 153 {
 154         struct tevent_req *req = tevent_req_callback_data(
 155                 subreq, struct tevent_req);
 156         struct winbindd_getgroups_state *state = tevent_req_data(
 157                 req, struct winbindd_getgroups_state);
 158         NTSTATUS status;
 159         struct unixid *xids;
 160         int i;
 161
 162         xids = talloc_array(state, struct unixid, state->num_sids);
 163         if (tevent_req_nomem(xids, req)) {
 164                 return;
 165         }
 166         for (i=0; i < state->num_sids; i++) {
 167                 xids[i].type = ID_TYPE_NOT_SPECIFIED;
 168                 xids[i].id = UINT32_MAX;
 169         }
 170
 171         status = wb_sids2xids_recv(subreq, xids, state->num_sids);
 172         TALLOC_FREE(subreq);
 173         if (NT_STATUS_EQUAL(status, NT_STATUS_NONE_MAPPED) ||
 174             NT_STATUS_EQUAL(status, STATUS_SOME_UNMAPPED))
 175         {
 176                 status = NT_STATUS_OK;
 177         }
 178         if (tevent_req_nterror(req, status)) {
 179                 return;
 180         }
 181
 182         state->gids = talloc_array(state, gid_t, state->num_sids);
 183         if (tevent_req_nomem(state->gids, req)) {
 184                 return;
 185         }
 186         state->num_gids = 0;
 187
 188         for (i=0; i < state->num_sids; i++) {
 189                 bool include_gid = false;
 190                 const char *debug_missing = NULL;
 191
 192                 switch (xids[i].type) {
 193                 case ID_TYPE_NOT_SPECIFIED:
 194                         debug_missing = "not specified";
 195                         break;
 196                 case ID_TYPE_UID:
 197                         if (i != 0) {
 198                                 debug_missing = "uid";
 199                         }
 200                         break;
 201                 case ID_TYPE_GID:
 202                 case ID_TYPE_BOTH:
 203                         include_gid = true;
 204                         break;
 205                 }
 206
 207                 if (!include_gid) {
 208                         struct dom_sid_buf sidbuf;
 209
 210                         if (debug_missing == NULL) {
 211                                 continue;
 212                         }
 213
 214                         DEBUG(10, ("WARNING: skipping unix id (%u) for sid %s "
 215                                    "from group list because the idmap type "
 216                                    "is %s. "
 217                                    "This might be a security problem when ACLs "
 218                                    "contain DENY ACEs!\n",
 219                                    (unsigned)xids[i].id,
 220                                    dom_sid_str_buf(&state->sids[i], &sidbuf),
 221                                    debug_missing));
 222                         continue;
 223                 }
 224
 225                 state->gids[state->num_gids] = (gid_t)xids[i].id;
 226                 state->num_gids += 1;
 227         }
 228
 229         /*
 230          * This should not fail, as it does not do any reallocation,
 231          * just updating the talloc size.
 232          */
 233         state->gids = talloc_realloc(state, state->gids, gid_t, state->num_gids);
 234         if (tevent_req_nomem(state->gids, req)) {
 235                 return;
 236         }
 237
 238         tevent_req_done(req);
 239 }
 240
 241 NTSTATUS winbindd_getgroups_recv(struct tevent_req *req,
 242                                  struct winbindd_response *response)
 243 {
 244         struct winbindd_getgroups_state *state = tevent_req_data(
 245                 req, struct winbindd_getgroups_state);
 246         NTSTATUS status;
 247
 248         if (tevent_req_is_nterror(req, &status)) {
 249                 struct dom_sid_buf buf;
 250                 DEBUG(5, ("Could not convert sid %s: %s\n",
 251                           dom_sid_str_buf(&state->sid, &buf),
 252                           nt_errstr(status)));
 253                 return status;
 254         }
 255
 256         response->data.num_entries = state->num_gids;
 257
 258         if (state->num_gids > 0) {
 259                 response->extra_data.data = talloc_move(response,
 260                                                         &state->gids);
 261                 response->length += state->num_gids * sizeof(gid_t);
 262         }
 263         return NT_STATUS_OK;
 264 }