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 "system/passwd.h"
  24 #include "winbindd.h"
  25 #include "nsswitch/winbind_client.h"
  26 #include "idmap.h"
  27 #include "lib/winbind_util.h"
  28
  29 #undef DBGC_CLASS
  30 #define DBGC_CLASS DBGC_IDMAP
  31
  32 /*****************************
  33  Initialise idmap database.
  34 *****************************/
  35
  36 static NTSTATUS idmap_nss_int_init(struct idmap_domain *dom)
  37 {
  38         return NT_STATUS_OK;
  39 }
  40
  41 /**********************************
  42  lookup a set of unix ids.
  43 **********************************/
  44
  45 static NTSTATUS idmap_nss_unixids_to_sids(struct idmap_domain *dom, struct id_map **ids)
  46 {
  47         int i;
  48
  49         /* initialize the status to avoid suprise */
  50         for (i = 0; ids[i]; i++) {
  51                 ids[i]->status = ID_UNKNOWN;
  52         }
  53
  54         for (i = 0; ids[i]; i++) {
  55                 struct passwd *pw;
  56                 struct group *gr;
  57                 const char *name;
  58                 enum lsa_SidType type;
  59                 bool ret;
  60
  61                 switch (ids[i]->xid.type) {
  62                 case ID_TYPE_UID:
  63                         pw = getpwuid((uid_t)ids[i]->xid.id);
  64
  65                         if (!pw) {
  66                                 ids[i]->status = ID_UNMAPPED;
  67                                 continue;
  68                         }
  69                         name = pw->pw_name;
  70                         break;
  71                 case ID_TYPE_GID:
  72                         gr = getgrgid((gid_t)ids[i]->xid.id);
  73
  74                         if (!gr) {
  75                                 ids[i]->status = ID_UNMAPPED;
  76                                 continue;
  77                         }
  78                         name = gr->gr_name;
  79                         break;
  80                 default: /* ?? */
  81                         ids[i]->status = ID_UNKNOWN;
  82                         continue;
  83                 }
  84
  85                 /* by default calls to winbindd are disabled
  86                    the following call will not recurse so this is safe */
  87                 (void)winbind_on();
  88                 /* Lookup name from PDC using lsa_lookup_names() */
  89                 ret = winbind_lookup_name(dom->name, name, ids[i]->sid, &type);
  90                 (void)winbind_off();
  91
  92                 if (!ret) {
  93                         /* TODO: how do we know if the name is really not mapped,
  94                          * or something just failed ? */
  95                         ids[i]->status = ID_UNMAPPED;
  96                         continue;
  97                 }
  98
  99                 switch (type) {
 100                 case SID_NAME_USER:
 101                         if (ids[i]->xid.type == ID_TYPE_UID) {
 102                                 ids[i]->status = ID_MAPPED;
 103                         }
 104                         break;
 105
 106                 case SID_NAME_DOM_GRP:
 107                 case SID_NAME_ALIAS:
 108                 case SID_NAME_WKN_GRP:
 109                         if (ids[i]->xid.type == ID_TYPE_GID) {
 110                                 ids[i]->status = ID_MAPPED;
 111                         }
 112                         break;
 113
 114                 default:
 115                         ids[i]->status = ID_UNKNOWN;
 116                         break;
 117                 }
 118         }
 119         return NT_STATUS_OK;
 120 }
 121
 122 /**********************************
 123  lookup a set of sids.
 124 **********************************/
 125
 126 static NTSTATUS idmap_nss_sids_to_unixids(struct idmap_domain *dom, struct id_map **ids)
 127 {
 128         int i;
 129
 130         /* initialize the status to avoid suprise */
 131         for (i = 0; ids[i]; i++) {
 132                 ids[i]->status = ID_UNKNOWN;
 133         }
 134
 135         for (i = 0; ids[i]; i++) {
 136                 struct group *gr;
 137                 enum lsa_SidType type;
 138                 char *name = NULL;
 139                 bool ret;
 140
 141                 /* by default calls to winbindd are disabled
 142                    the following call will not recurse so this is safe */
 143                 (void)winbind_on();
 144                 ret = winbind_lookup_sid(talloc_tos(), ids[i]->sid, NULL,
 145                                          (const char **)&name, &type);
 146                 (void)winbind_off();
 147
 148                 if (!ret) {
 149                         /* TODO: how do we know if the name is really not mapped,
 150                          * or something just failed ? */
 151                         ids[i]->status = ID_UNMAPPED;
 152                         continue;
 153                 }
 154
 155                 switch (type) {
 156                 case SID_NAME_USER: {
 157                         struct passwd *pw;
 158
 159                         /* this will find also all lower case name and use username level */
 160
 161                         pw = Get_Pwnam_alloc(talloc_tos(), name);
 162                         if (pw) {
 163                                 ids[i]->xid.id = pw->pw_uid;
 164                                 ids[i]->xid.type = ID_TYPE_UID;
 165                                 ids[i]->status = ID_MAPPED;
 166                         }
 167                         TALLOC_FREE(pw);
 168                         break;
 169                 }
 170
 171                 case SID_NAME_DOM_GRP:
 172                 case SID_NAME_ALIAS:
 173                 case SID_NAME_WKN_GRP:
 174
 175                         gr = getgrnam(name);
 176                         if (gr) {
 177                                 ids[i]->xid.id = gr->gr_gid;
 178                                 ids[i]->xid.type = ID_TYPE_GID;
 179                                 ids[i]->status = ID_MAPPED;
 180                         }
 181                         break;
 182
 183                 default:
 184                         ids[i]->status = ID_UNKNOWN;
 185                         break;
 186                 }
 187                 TALLOC_FREE(name);
 188         }
 189         return NT_STATUS_OK;
 190 }
 191
 192 /**********************************
 193  Close the idmap tdb instance
 194 **********************************/
 195
 196 static struct idmap_methods nss_methods = {
 197
 198         .init = idmap_nss_int_init,
 199         .unixids_to_sids = idmap_nss_unixids_to_sids,
 200         .sids_to_unixids = idmap_nss_sids_to_unixids,
 201 };
 202
 203 NTSTATUS idmap_nss_init(void)
 204 {
 205         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "nss", &nss_methods);
 206 }