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                                    const char *params)
  36 {
  37         return NT_STATUS_OK;
  38 }
  39
  40 /**********************************
  41  lookup a set of unix ids.
  42 **********************************/
  43
  44 static NTSTATUS idmap_nss_unixids_to_sids(struct idmap_domain *dom, struct id_map **ids)
  45 {
  46         int i;
  47
  48         /* initialize the status to avoid suprise */
  49         for (i = 0; ids[i]; i++) {
  50                 ids[i]->status = ID_UNKNOWN;
  51         }
  52
  53         for (i = 0; ids[i]; i++) {
  54                 struct passwd *pw;
  55                 struct group *gr;
  56                 const char *name;
  57                 enum lsa_SidType type;
  58                 bool ret;
  59
  60                 switch (ids[i]->xid.type) {
  61                 case ID_TYPE_UID:
  62                         pw = getpwuid((uid_t)ids[i]->xid.id);
  63
  64                         if (!pw) {
  65                                 ids[i]->status = ID_UNMAPPED;
  66                                 continue;
  67                         }
  68                         name = pw->pw_name;
  69                         break;
  70                 case ID_TYPE_GID:
  71                         gr = getgrgid((gid_t)ids[i]->xid.id);
  72
  73                         if (!gr) {
  74                                 ids[i]->status = ID_UNMAPPED;
  75                                 continue;
  76                         }
  77                         name = gr->gr_name;
  78                         break;
  79                 default: /* ?? */
  80                         ids[i]->status = ID_UNKNOWN;
  81                         continue;
  82                 }
  83
  84                 /* by default calls to winbindd are disabled
  85                    the following call will not recurse so this is safe */
  86                 (void)winbind_on();
  87                 /* Lookup name from PDC using lsa_lookup_names() */
  88                 ret = winbind_lookup_name(dom->name, name, ids[i]->sid, &type);
  89                 (void)winbind_off();
  90
  91                 if (!ret) {
  92                         /* TODO: how do we know if the name is really not mapped,
  93                          * or something just failed ? */
  94                         ids[i]->status = ID_UNMAPPED;
  95                         continue;
  96                 }
  97
  98                 switch (type) {
  99                 case SID_NAME_USER:
 100                         if (ids[i]->xid.type == ID_TYPE_UID) {
 101                                 ids[i]->status = ID_MAPPED;
 102                         }
 103                         break;
 104
 105                 case SID_NAME_DOM_GRP:
 106                 case SID_NAME_ALIAS:
 107                 case SID_NAME_WKN_GRP:
 108                         if (ids[i]->xid.type == ID_TYPE_GID) {
 109                                 ids[i]->status = ID_MAPPED;
 110                         }
 111                         break;
 112
 113                 default:
 114                         ids[i]->status = ID_UNKNOWN;
 115                         break;
 116                 }
 117         }
 118         return NT_STATUS_OK;
 119 }
 120
 121 /**********************************
 122  lookup a set of sids.
 123 **********************************/
 124
 125 static NTSTATUS idmap_nss_sids_to_unixids(struct idmap_domain *dom, struct id_map **ids)
 126 {
 127         TALLOC_CTX *ctx;
 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         ctx = talloc_new(dom);
 136         if ( ! ctx) {
 137                 DEBUG(0, ("Out of memory!\n"));
 138                 return NT_STATUS_NO_MEMORY;
 139         }
 140
 141         for (i = 0; ids[i]; i++) {
 142                 struct group *gr;
 143                 enum lsa_SidType type;
 144                 const char *name = NULL;
 145                 bool ret;
 146
 147                 /* by default calls to winbindd are disabled
 148                    the following call will not recurse so this is safe */
 149                 (void)winbind_on();
 150                 ret = winbind_lookup_sid(ctx, ids[i]->sid, NULL, &name, &type);
 151                 (void)winbind_off();
 152
 153                 if (!ret) {
 154                         /* TODO: how do we know if the name is really not mapped,
 155                          * or something just failed ? */
 156                         ids[i]->status = ID_UNMAPPED;
 157                         continue;
 158                 }
 159
 160                 switch (type) {
 161                 case SID_NAME_USER: {
 162                         struct passwd *pw;
 163
 164                         /* this will find also all lower case name and use username level */
 165
 166                         pw = Get_Pwnam_alloc(talloc_tos(), name);
 167                         if (pw) {
 168                                 ids[i]->xid.id = pw->pw_uid;
 169                                 ids[i]->xid.type = ID_TYPE_UID;
 170                                 ids[i]->status = ID_MAPPED;
 171                         }
 172                         TALLOC_FREE(pw);
 173                         break;
 174                 }
 175
 176                 case SID_NAME_DOM_GRP:
 177                 case SID_NAME_ALIAS:
 178                 case SID_NAME_WKN_GRP:
 179
 180                         gr = getgrnam(name);
 181                         if (gr) {
 182                                 ids[i]->xid.id = gr->gr_gid;
 183                                 ids[i]->xid.type = ID_TYPE_GID;
 184                                 ids[i]->status = ID_MAPPED;
 185                         }
 186                         break;
 187
 188                 default:
 189                         ids[i]->status = ID_UNKNOWN;
 190                         break;
 191                 }
 192         }
 193
 194         talloc_free(ctx);
 195         return NT_STATUS_OK;
 196 }
 197
 198 /**********************************
 199  Close the idmap tdb instance
 200 **********************************/
 201
 202 static struct idmap_methods nss_methods = {
 203
 204         .init = idmap_nss_int_init,
 205         .unixids_to_sids = idmap_nss_unixids_to_sids,
 206         .sids_to_unixids = idmap_nss_sids_to_unixids,
 207 };
 208
 209 NTSTATUS idmap_nss_init(void)
 210 {
 211         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "nss", &nss_methods);
 212 }