source3/winbindd/wb_getgrsid.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    async getgrsid
   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_winbind_c.h"
  23 #include "../libcli/security/security.h"
  24 #include "lib/dbwrap/dbwrap_rbt.h"
  25 #include "lib/dbwrap/dbwrap.h"
  26
  27 struct wb_getgrsid_state {
  28         struct tevent_context *ev;
  29         struct dom_sid sid;
  30         int max_nesting;
  31         const char *domname;
  32         const char *name;
  33         enum lsa_SidType type;
  34         gid_t gid;
  35         struct db_context *members;
  36         uint32_t num_sids;
  37         struct dom_sid *sids;
  38 };
  39
  40 static void wb_getgrsid_lookupsid_done(struct tevent_req *subreq);
  41 static void wb_getgrsid_sid2gid_done(struct tevent_req *subreq);
  42 static void wb_getgrsid_got_members(struct tevent_req *subreq);
  43 static void wb_getgrsid_got_alias_members(struct tevent_req *subreq);
  44
  45 struct tevent_req *wb_getgrsid_send(TALLOC_CTX *mem_ctx,
  46                                     struct tevent_context *ev,
  47                                     const struct dom_sid *group_sid,
  48                                     int max_nesting)
  49 {
  50         struct tevent_req *req, *subreq;
  51         struct wb_getgrsid_state *state;
  52         struct dom_sid_buf buf;
  53
  54         req = tevent_req_create(mem_ctx, &state, struct wb_getgrsid_state);
  55         if (req == NULL) {
  56                 return NULL;
  57         }
  58
  59         D_INFO("WB command getgrsid start.\nLooking up group SID %s.\n", dom_sid_str_buf(group_sid, &buf));
  60
  61         sid_copy(&state->sid, group_sid);
  62         state->ev = ev;
  63         state->max_nesting = max_nesting;
  64
  65         if (dom_sid_in_domain(&global_sid_Unix_Groups, group_sid)) {
  66                 /* unmapped Unix groups must be resolved locally */
  67                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
  68                 return tevent_req_post(req, ev);
  69         }
  70
  71         subreq = wb_lookupsid_send(state, ev, &state->sid);
  72         if (tevent_req_nomem(subreq, req)) {
  73                 return tevent_req_post(req, ev);
  74         }
  75         tevent_req_set_callback(subreq, wb_getgrsid_lookupsid_done, req);
  76         return req;
  77 }
  78
  79 static void wb_getgrsid_lookupsid_done(struct tevent_req *subreq)
  80 {
  81         struct tevent_req *req = tevent_req_callback_data(
  82                 subreq, struct tevent_req);
  83         struct wb_getgrsid_state *state = tevent_req_data(
  84                 req, struct wb_getgrsid_state);
  85         NTSTATUS status;
  86
  87         status = wb_lookupsid_recv(subreq, state, &state->type,
  88                                    &state->domname, &state->name);
  89         TALLOC_FREE(subreq);
  90         if (tevent_req_nterror(req, status)) {
  91                 return;
  92         }
  93
  94         switch (state->type) {
  95         case SID_NAME_DOM_GRP:
  96         case SID_NAME_ALIAS:
  97         case SID_NAME_WKN_GRP:
  98         /*
  99          * also treat user-type SIDS (they might map to ID_TYPE_BOTH)
 100          */
 101         case SID_NAME_USER:
 102         case SID_NAME_COMPUTER:
 103                 break;
 104         default:
 105                 tevent_req_nterror(req, NT_STATUS_NO_SUCH_GROUP);
 106                 return;
 107         }
 108
 109         subreq = wb_sids2xids_send(state, state->ev, &state->sid, 1);
 110         if (tevent_req_nomem(subreq, req)) {
 111                 return;
 112         }
 113         tevent_req_set_callback(subreq, wb_getgrsid_sid2gid_done, req);
 114 }
 115
 116 static void wb_getgrsid_sid2gid_done(struct tevent_req *subreq)
 117 {
 118         struct tevent_req *req = tevent_req_callback_data(
 119                 subreq, struct tevent_req);
 120         struct wb_getgrsid_state *state = tevent_req_data(
 121                 req, struct wb_getgrsid_state);
 122         NTSTATUS status;
 123         struct unixid xids[1];
 124
 125         status = wb_sids2xids_recv(subreq, xids, ARRAY_SIZE(xids));
 126         TALLOC_FREE(subreq);
 127         if (tevent_req_nterror(req, status)) {
 128                 return;
 129         }
 130
 131         /*
 132          * We are filtering further down in sids2xids, but that filtering
 133          * depends on the actual type of the sid handed in (as determined
 134          * by lookupsids). Here we need to filter for the type of object
 135          * actually requested, in this case uid.
 136          */
 137         if (!(xids[0].type == ID_TYPE_GID || xids[0].type == ID_TYPE_BOTH)) {
 138                 tevent_req_nterror(req, NT_STATUS_NONE_MAPPED);
 139                 return;
 140         }
 141
 142         state->gid = (gid_t)xids[0].id;
 143
 144         switch (state->type) {
 145         case SID_NAME_USER:
 146         case SID_NAME_COMPUTER: {
 147                 /*
 148                  * special treatment for a user sid that is
 149                  * mapped to ID_TYPE_BOTH:
 150                  * create a group with the sid/xid as only member
 151                  */
 152                 const char *name;
 153
 154                 if (xids[0].type != ID_TYPE_BOTH) {
 155                         tevent_req_nterror(req, NT_STATUS_NO_SUCH_GROUP);
 156                         return;
 157                 }
 158
 159                 state->members = db_open_rbt(state);
 160                 if (tevent_req_nomem(state->members, req)) {
 161                         return;
 162                 }
 163
 164                 name = fill_domain_username_talloc(talloc_tos(),
 165                                                    state->domname,
 166                                                    state->name,
 167                                                    true /* can_assume */);
 168                 if (tevent_req_nomem(name, req)) {
 169                         return;
 170                 }
 171
 172                 status = add_member_to_db(state->members, &state->sid, name);
 173                 if (!NT_STATUS_IS_OK(status)) {
 174                         tevent_req_nterror(req, status);
 175                         return;
 176                 }
 177
 178                 tevent_req_done(req);
 179                 return;
 180         }
 181         case SID_NAME_ALIAS:
 182                 subreq = wb_alias_members_send(state,
 183                                                state->ev,
 184                                                &state->sid,
 185                                                state->type,
 186                                                state->max_nesting);
 187                 if (tevent_req_nomem(subreq, req)) {
 188                         return;
 189                 }
 190                 /* Decrement the depth based on 'winbind expand groups' */
 191                 state->max_nesting--;
 192                 tevent_req_set_callback(subreq,
 193                                         wb_getgrsid_got_alias_members,
 194                                         req);
 195                 break;
 196         case SID_NAME_DOM_GRP:
 197                 subreq = wb_group_members_send(state,
 198                                                state->ev,
 199                                                &state->sid,
 200                                                1,
 201                                                &state->type,
 202                                                state->max_nesting);
 203                 if (tevent_req_nomem(subreq, req)) {
 204                         return;
 205                 }
 206                 tevent_req_set_callback(subreq, wb_getgrsid_got_members, req);
 207                 break;
 208         case SID_NAME_WKN_GRP:
 209                 state->members = db_open_rbt(state);
 210                 if (tevent_req_nomem(state->members, req)) {
 211                         return;
 212                 }
 213                 tevent_req_done(req);
 214                 return;
 215         default:
 216                 tevent_req_nterror(req, NT_STATUS_NO_SUCH_GROUP);
 217                 break;
 218         }
 219 }
 220
 221 static void wb_getgrsid_got_alias_members_names(struct tevent_req *subreq)
 222 {
 223         struct tevent_req *req =
 224                 tevent_req_callback_data(subreq, struct tevent_req);
 225         struct wb_getgrsid_state *state =
 226                 tevent_req_data(req, struct wb_getgrsid_state);
 227         struct lsa_RefDomainList *domains = NULL;
 228         struct lsa_TransNameArray *names = NULL;
 229         NTSTATUS status;
 230         uint32_t li;
 231         uint32_t num_sids = 0;
 232         struct dom_sid *sids = NULL;
 233         enum lsa_SidType *types = NULL;
 234
 235         status = wb_lookupsids_recv(subreq, state, &domains, &names);
 236
 237         TALLOC_FREE(subreq);
 238         if (tevent_req_nterror(req, status)) {
 239                 D_WARNING("Failed with %s.\n", nt_errstr(status));
 240                 return;
 241         }
 242
 243         if (domains == NULL) {
 244                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 245                 D_WARNING("Failed with NT_STATUS_INTERNAL_ERROR.\n");
 246                 return;
 247         }
 248
 249         if (names == NULL) {
 250                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 251                 D_WARNING("Failed with NT_STATUS_INTERNAL_ERROR.\n");
 252                 return;
 253         }
 254
 255         state->members = db_open_rbt(state);
 256         if (tevent_req_nomem(state->members, req)) {
 257                 return;
 258         }
 259
 260         for (li = 0; li < state->num_sids; li++) {
 261                 struct lsa_TranslatedName *n = &names->names[li];
 262
 263                 if (n->sid_type == SID_NAME_USER ||
 264                     n->sid_type == SID_NAME_COMPUTER) {
 265                         const char *name = fill_domain_username_talloc(
 266                                 talloc_tos(),
 267                                 domains->domains[n->sid_index].name.string,
 268                                 n->name.string,
 269                                 false /* can_assume */);
 270                         if (tevent_req_nomem(name, req)) {
 271                                 return;
 272                         }
 273
 274                         status = add_member_to_db(state->members,
 275                                                   &state->sids[li],
 276                                                   name);
 277                         if (!NT_STATUS_IS_OK(status)) {
 278                                 tevent_req_nterror(req, status);
 279                                 return;
 280                         }
 281                 } else if (n->sid_type == SID_NAME_DOM_GRP) {
 282                         sids = talloc_realloc(talloc_tos(),
 283                                               sids,
 284                                               struct dom_sid,
 285                                               num_sids + 1);
 286                         if (tevent_req_nomem(sids, req)) {
 287                                 return;
 288                         }
 289                         sids[num_sids] = state->sids[li];
 290                         types = talloc_realloc(talloc_tos(),
 291                                                types,
 292                                                enum lsa_SidType,
 293                                                num_sids + 1);
 294                         if (tevent_req_nomem(types, req)) {
 295                                 return;
 296                         }
 297                         types[num_sids] = n->sid_type;
 298                         num_sids++;
 299                 } else {
 300                         struct dom_sid_buf buf;
 301                         D_DEBUG("SID %s with sid_type=%d is ignored!\n",
 302                                 dom_sid_str_buf(&state->sids[li], &buf),
 303                                 n->sid_type);
 304                 }
 305         }
 306
 307         TALLOC_FREE(names);
 308         TALLOC_FREE(domains);
 309
 310         if (num_sids == 0) {
 311                 tevent_req_done(req);
 312                 return;
 313         }
 314         subreq = wb_group_members_send(state,
 315                                        state->ev,
 316                                        sids,
 317                                        num_sids,
 318                                        types,
 319                                        state->max_nesting);
 320         if (tevent_req_nomem(subreq, req)) {
 321                 return;
 322         }
 323         tevent_req_set_callback(subreq, wb_getgrsid_got_members, req);
 324 }
 325
 326 static void wb_getgrsid_got_alias_members(struct tevent_req *subreq)
 327 {
 328         struct tevent_req *req =
 329                 tevent_req_callback_data(subreq, struct tevent_req);
 330         struct wb_getgrsid_state *state =
 331                 tevent_req_data(req, struct wb_getgrsid_state);
 332         NTSTATUS status;
 333
 334         status = wb_alias_members_recv(subreq,
 335                                        state,
 336                                        &state->num_sids,
 337                                        &state->sids);
 338         TALLOC_FREE(subreq);
 339         if (tevent_req_nterror(req, status)) {
 340                 return;
 341         }
 342
 343         subreq = wb_lookupsids_send(state,
 344                                     state->ev,
 345                                     state->sids,
 346                                     state->num_sids);
 347         if (tevent_req_nomem(subreq, req)) {
 348                 return;
 349         }
 350         tevent_req_set_callback(subreq,
 351                                 wb_getgrsid_got_alias_members_names,
 352                                 req);
 353 }
 354
 355 static void wb_getgrsid_got_members(struct tevent_req *subreq)
 356 {
 357         struct tevent_req *req = tevent_req_callback_data(
 358                 subreq, struct tevent_req);
 359         struct wb_getgrsid_state *state = tevent_req_data(
 360                 req, struct wb_getgrsid_state);
 361         NTSTATUS status;
 362         struct db_context *members_prev = state->members;
 363
 364         status = wb_group_members_recv(subreq, state, &state->members);
 365         TALLOC_FREE(subreq);
 366         if (tevent_req_nterror(req, status)) {
 367                 return;
 368         }
 369         /*
 370          * If we have called wb_alias_members_send(), members_prev
 371          * might already contain users that are direct members of alias,
 372          * add to them the users from nested groups.
 373          */
 374         if (members_prev != NULL) {
 375                 status = dbwrap_merge_dbs(state->members,
 376                                           members_prev,
 377                                           TDB_REPLACE);
 378                 if (tevent_req_nterror(req, status)) {
 379                         return;
 380                 }
 381         }
 382         tevent_req_done(req);
 383 }
 384
 385 NTSTATUS wb_getgrsid_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 386                           const char **domname, const char **name, gid_t *gid,
 387                           struct db_context **members)
 388 {
 389         struct wb_getgrsid_state *state = tevent_req_data(
 390                 req, struct wb_getgrsid_state);
 391         NTSTATUS status;
 392
 393         D_INFO("WB command getgrsid end.\n");
 394         if (tevent_req_is_nterror(req, &status)) {
 395                 D_WARNING("Failed with %s.\n", nt_errstr(status));
 396                 return status;
 397         }
 398         *domname = talloc_move(mem_ctx, &state->domname);
 399         *name = talloc_move(mem_ctx, &state->name);
 400         *gid = state->gid;
 401         *members = talloc_move(mem_ctx, &state->members);
 402         return NT_STATUS_OK;
 403 }