source3/winbindd/idmap_nss.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    idmap NSS backend
   5
   6    Copyright (C) Simo Sorce 2006
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "winbindd.h"
  24 #include "nsswitch/winbind_client.h"
  25 #include "idmap.h"
  26
  27 #undef DBGC_CLASS
  28 #define DBGC_CLASS DBGC_IDMAP
  29
  30 /*****************************
  31  Initialise idmap database.
  32 *****************************/
  33
  34 static NTSTATUS idmap_nss_int_init(struct idmap_domain *dom)
  35 {
  36         return NT_STATUS_OK;
  37 }
  38
  39 /**********************************
  40  lookup a set of unix ids.
  41 **********************************/
  42
  43 static NTSTATUS idmap_nss_unixids_to_sids(struct idmap_domain *dom, struct id_map **ids)
  44 {
  45         int i;
  46
  47         /* initialize the status to avoid suprise */
  48         for (i = 0; ids[i]; i++) {
  49                 ids[i]->status = ID_UNKNOWN;
  50         }
  51
  52         for (i = 0; ids[i]; i++) {
  53                 struct passwd *pw;
  54                 struct group *gr;
  55                 const char *name;
  56                 enum lsa_SidType type;
  57                 bool ret;
  58
  59                 switch (ids[i]->xid.type) {
  60                 case ID_TYPE_UID:
  61                         pw = getpwuid((uid_t)ids[i]->xid.id);
  62
  63                         if (!pw) {
  64                                 ids[i]->status = ID_UNMAPPED;
  65                                 continue;
  66                         }
  67                         name = pw->pw_name;
  68                         break;
  69                 case ID_TYPE_GID:
  70                         gr = getgrgid((gid_t)ids[i]->xid.id);
  71
  72                         if (!gr) {
  73                                 ids[i]->status = ID_UNMAPPED;
  74                                 continue;
  75                         }
  76                         name = gr->gr_name;
  77                         break;
  78                 default: /* ?? */
  79                         ids[i]->status = ID_UNKNOWN;
  80                         continue;
  81                 }
  82
  83                 /* by default calls to winbindd are disabled
  84                    the following call will not recurse so this is safe */
  85                 (void)winbind_on();
  86                 /* Lookup name from PDC using lsa_lookup_names() */
  87                 ret = winbind_lookup_name(dom->name, name, ids[i]->sid, &type);
  88                 (void)winbind_off();
  89
  90                 if (!ret) {
  91                         /* TODO: how do we know if the name is really not mapped,
  92                          * or something just failed ? */
  93                         ids[i]->status = ID_UNMAPPED;
  94                         continue;
  95                 }
  96
  97                 switch (type) {
  98                 case SID_NAME_USER:
  99                         if (ids[i]->xid.type == ID_TYPE_UID) {
 100                                 ids[i]->status = ID_MAPPED;
 101                         }
 102                         break;
 103
 104                 case SID_NAME_DOM_GRP:
 105                 case SID_NAME_ALIAS:
 106                 case SID_NAME_WKN_GRP:
 107                         if (ids[i]->xid.type == ID_TYPE_GID) {
 108                                 ids[i]->status = ID_MAPPED;
 109                         }
 110                         break;
 111
 112                 default:
 113                         ids[i]->status = ID_UNKNOWN;
 114                         break;
 115                 }
 116         }
 117         return NT_STATUS_OK;
 118 }
 119
 120 /**********************************
 121  lookup a set of sids.
 122 **********************************/
 123
 124 static NTSTATUS idmap_nss_sids_to_unixids(struct idmap_domain *dom, struct id_map **ids)
 125 {
 126         int i;
 127
 128         /* initialize the status to avoid suprise */
 129         for (i = 0; ids[i]; i++) {
 130                 ids[i]->status = ID_UNKNOWN;
 131         }
 132
 133         for (i = 0; ids[i]; i++) {
 134                 struct group *gr;
 135                 enum lsa_SidType type;
 136                 char *name = NULL;
 137                 bool ret;
 138
 139                 /* by default calls to winbindd are disabled
 140                    the following call will not recurse so this is safe */
 141                 (void)winbind_on();
 142                 ret = winbind_lookup_sid(talloc_tos(), ids[i]->sid, NULL,
 143                                          (const char **)&name, &type);
 144                 (void)winbind_off();
 145
 146                 if (!ret) {
 147                         /* TODO: how do we know if the name is really not mapped,
 148                          * or something just failed ? */
 149                         ids[i]->status = ID_UNMAPPED;
 150                         continue;
 151                 }
 152
 153                 switch (type) {
 154                 case SID_NAME_USER: {
 155                         struct passwd *pw;
 156
 157                         /* this will find also all lower case name and use username level */
 158
 159                         pw = Get_Pwnam_alloc(talloc_tos(), name);
 160                         if (pw) {
 161                                 ids[i]->xid.id = pw->pw_uid;
 162                                 ids[i]->xid.type = ID_TYPE_UID;
 163                                 ids[i]->status = ID_MAPPED;
 164                         }
 165                         TALLOC_FREE(pw);
 166                         break;
 167                 }
 168
 169                 case SID_NAME_DOM_GRP:
 170                 case SID_NAME_ALIAS:
 171                 case SID_NAME_WKN_GRP:
 172
 173                         gr = getgrnam(name);
 174                         if (gr) {
 175                                 ids[i]->xid.id = gr->gr_gid;
 176                                 ids[i]->xid.type = ID_TYPE_GID;
 177                                 ids[i]->status = ID_MAPPED;
 178                         }
 179                         break;
 180
 181                 default:
 182                         ids[i]->status = ID_UNKNOWN;
 183                         break;
 184                 }
 185                 TALLOC_FREE(name);
 186         }
 187         return NT_STATUS_OK;
 188 }
 189
 190 /**********************************
 191  Close the idmap tdb instance
 192 **********************************/
 193
 194 static struct idmap_methods nss_methods = {
 195
 196         .init = idmap_nss_int_init,
 197         .unixids_to_sids = idmap_nss_unixids_to_sids,
 198         .sids_to_unixids = idmap_nss_sids_to_unixids,
 199 };
 200
 201 NTSTATUS idmap_nss_init(void)
 202 {
 203         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "nss", &nss_methods);
 204 }