source3/winbindd/idmap_nss.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    idmap PASSDB 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
  25 #undef DBGC_CLASS
  26 #define DBGC_CLASS DBGC_IDMAP
  27
  28 /*****************************
  29  Initialise idmap database.
  30 *****************************/
  31
  32 static NTSTATUS idmap_nss_int_init(struct idmap_domain *dom)
  33 {
  34         dom->initialized = True;
  35         return NT_STATUS_OK;
  36 }
  37
  38 /**********************************
  39  lookup a set of unix ids.
  40 **********************************/
  41
  42 static NTSTATUS idmap_nss_unixids_to_sids(struct idmap_domain *dom, struct id_map **ids)
  43 {
  44         TALLOC_CTX *ctx;
  45         int i;
  46
  47         if (! dom->initialized) {
  48                 return NT_STATUS_UNSUCCESSFUL;
  49         }
  50
  51         ctx = talloc_new(dom);
  52         if ( ! ctx) {
  53                 DEBUG(0, ("Out of memory!\n"));
  54                 return NT_STATUS_NO_MEMORY;
  55         }
  56
  57         for (i = 0; ids[i]; i++) {
  58                 struct passwd *pw;
  59                 struct group *gr;
  60                 const char *name;
  61                 enum lsa_SidType type;
  62                 BOOL ret;
  63
  64                 switch (ids[i]->xid.type) {
  65                 case ID_TYPE_UID:
  66                         pw = getpwuid((uid_t)ids[i]->xid.id);
  67
  68                         if (!pw) {
  69                                 ids[i]->status = ID_UNMAPPED;
  70                                 continue;
  71                         }
  72                         name = pw->pw_name;
  73                         break;
  74                 case ID_TYPE_GID:
  75                         gr = getgrgid((gid_t)ids[i]->xid.id);
  76
  77                         if (!gr) {
  78                                 ids[i]->status = ID_UNMAPPED;
  79                                 continue;
  80                         }
  81                         name = gr->gr_name;
  82                         break;
  83                 default: /* ?? */
  84                         ids[i]->status = ID_UNKNOWN;
  85                         continue;
  86                 }
  87
  88                 /* by default calls to winbindd are disabled
  89                    the following call will not recurse so this is safe */
  90                 winbind_on();
  91                 /* Lookup name from PDC using lsa_lookup_names() */
  92                 ret = winbind_lookup_name(dom->name, name, ids[i]->sid, &type);
  93                 winbind_off();
  94
  95                 if (!ret) {
  96                         /* TODO: how do we know if the name is really not mapped,
  97                          * or something just failed ? */
  98                         ids[i]->status = ID_UNMAPPED;
  99                         continue;
 100                 }
 101
 102                 switch (type) {
 103                 case SID_NAME_USER:
 104                         if (ids[i]->xid.type == ID_TYPE_UID) {
 105                                 ids[i]->status = ID_MAPPED;
 106                         }
 107                         break;
 108
 109                 case SID_NAME_DOM_GRP:
 110                 case SID_NAME_ALIAS:
 111                 case SID_NAME_WKN_GRP:
 112                         if (ids[i]->xid.type == ID_TYPE_GID) {
 113                                 ids[i]->status = ID_MAPPED;
 114                         }
 115                         break;
 116
 117                 default:
 118                         ids[i]->status = ID_UNKNOWN;
 119                         break;
 120                 }
 121         }
 122
 123
 124         talloc_free(ctx);
 125         return NT_STATUS_OK;
 126 }
 127
 128 /**********************************
 129  lookup a set of sids.
 130 **********************************/
 131
 132 static NTSTATUS idmap_nss_sids_to_unixids(struct idmap_domain *dom, struct id_map **ids)
 133 {
 134         TALLOC_CTX *ctx;
 135         int i;
 136
 137         if (! dom->initialized) {
 138                 return NT_STATUS_UNSUCCESSFUL;
 139         }
 140
 141         ctx = talloc_new(dom);
 142         if ( ! ctx) {
 143                 DEBUG(0, ("Out of memory!\n"));
 144                 return NT_STATUS_NO_MEMORY;
 145         }
 146
 147         for (i = 0; ids[i]; i++) {
 148                 struct passwd *pw;
 149                 struct group *gr;
 150                 enum lsa_SidType type;
 151                 const char *dom_name = NULL;
 152                 const char *name = NULL;
 153                 BOOL ret;
 154
 155                 /* by default calls to winbindd are disabled
 156                    the following call will not recurse so this is safe */
 157                 winbind_on();
 158                 ret = winbind_lookup_sid(ctx, ids[i]->sid, &dom_name, &name, &type);
 159                 winbind_off();
 160
 161                 if (!ret) {
 162                         /* TODO: how do we know if the name is really not mapped,
 163                          * or something just failed ? */
 164                         ids[i]->status = ID_UNMAPPED;
 165                         continue;
 166                 }
 167
 168                 switch (type) {
 169                 case SID_NAME_USER:
 170
 171                         /* this will find also all lower case name and use username level */
 172
 173                         pw = Get_Pwnam(name);
 174                         if (pw) {
 175                                 ids[i]->xid.id = pw->pw_uid;
 176                                 ids[i]->xid.type = ID_TYPE_UID;
 177                                 ids[i]->status = ID_MAPPED;
 178                         }
 179                         break;
 180
 181                 case SID_NAME_DOM_GRP:
 182                 case SID_NAME_ALIAS:
 183                 case SID_NAME_WKN_GRP:
 184
 185                         gr = getgrnam(name);
 186                         if (gr) {
 187                                 ids[i]->xid.id = gr->gr_gid;
 188                                 ids[i]->xid.type = ID_TYPE_GID;
 189                                 ids[i]->status = ID_MAPPED;
 190                         }
 191                         break;
 192
 193                 default:
 194                         ids[i]->status = ID_UNKNOWN;
 195                         break;
 196                 }
 197         }
 198
 199         talloc_free(ctx);
 200         return NT_STATUS_OK;
 201 }
 202
 203 /**********************************
 204  Close the idmap tdb instance
 205 **********************************/
 206
 207 static NTSTATUS idmap_nss_close(struct idmap_domain *dom)
 208 {
 209         return NT_STATUS_OK;
 210 }
 211
 212 static struct idmap_methods nss_methods = {
 213
 214         .init = idmap_nss_int_init,
 215         .unixids_to_sids = idmap_nss_unixids_to_sids,
 216         .sids_to_unixids = idmap_nss_sids_to_unixids,
 217         .close_fn = idmap_nss_close
 218 };
 219
 220 NTSTATUS idmap_nss_init(void)
 221 {
 222         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "nss", &nss_methods);
 223 }