source/nsswitch/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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "winbindd.h"
  25
  26 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_IDMAP
  28
  29 /*****************************
  30  Initialise idmap database.
  31 *****************************/
  32
  33 static NTSTATUS idmap_nss_int_init(struct idmap_domain *dom)
  34 {
  35         dom->initialized = True;
  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         TALLOC_CTX *ctx;
  46         int i;
  47
  48         ctx = talloc_new(dom);
  49         if ( ! ctx) {
  50                 DEBUG(0, ("Out of memory!\n"));
  51                 return NT_STATUS_NO_MEMORY;
  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                 winbind_on();
  88                 /* Lookup name from PDC using lsa_lookup_names() */
  89                 ret = winbind_lookup_name(dom->name, name, ids[i]->sid, &type);
  90                 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
 120
 121         talloc_free(ctx);
 122         return NT_STATUS_OK;
 123 }
 124
 125 /**********************************
 126  lookup a set of sids.
 127 **********************************/
 128
 129 static NTSTATUS idmap_nss_sids_to_unixids(struct idmap_domain *dom, struct id_map **ids)
 130 {
 131         TALLOC_CTX *ctx;
 132         int i;
 133
 134         ctx = talloc_new(dom);
 135         if ( ! ctx) {
 136                 DEBUG(0, ("Out of memory!\n"));
 137                 return NT_STATUS_NO_MEMORY;
 138         }
 139
 140         for (i = 0; ids[i]; i++) {
 141                 struct passwd *pw;
 142                 struct group *gr;
 143                 enum lsa_SidType type;
 144                 const char *dom_name = NULL;
 145                 const char *name = NULL;
 146                 BOOL ret;
 147
 148                 /* by default calls to winbindd are disabled
 149                    the following call will not recurse so this is safe */
 150                 winbind_on();
 151                 ret = winbind_lookup_sid(ctx, ids[i]->sid, &dom_name, &name, &type);
 152                 winbind_off();
 153
 154                 if (!ret) {
 155                         /* TODO: how do we know if the name is really not mapped,
 156                          * or something just failed ? */
 157                         ids[i]->status = ID_UNMAPPED;
 158                         continue;
 159                 }
 160
 161                 switch (type) {
 162                 case SID_NAME_USER:
 163
 164                         /* this will find also all lower case name and use username level */
 165
 166                         pw = Get_Pwnam(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                         break;
 173
 174                 case SID_NAME_DOM_GRP:
 175                 case SID_NAME_ALIAS:
 176                 case SID_NAME_WKN_GRP:
 177
 178                         gr = getgrnam(name);
 179                         if (gr) {
 180                                 ids[i]->xid.id = gr->gr_gid;
 181                                 ids[i]->xid.type = ID_TYPE_GID;
 182                                 ids[i]->status = ID_MAPPED;
 183                         }
 184                         break;
 185
 186                 default:
 187                         ids[i]->status = ID_UNKNOWN;
 188                         break;
 189                 }
 190         }
 191
 192         talloc_free(ctx);
 193         return NT_STATUS_OK;
 194 }
 195
 196 /**********************************
 197  Close the idmap tdb instance
 198 **********************************/
 199
 200 static NTSTATUS idmap_nss_close(struct idmap_domain *dom)
 201 {
 202         return NT_STATUS_OK;
 203 }
 204
 205 static struct idmap_methods nss_methods = {
 206
 207         .init = idmap_nss_int_init,
 208         .unixids_to_sids = idmap_nss_unixids_to_sids,
 209         .sids_to_unixids = idmap_nss_sids_to_unixids,
 210         .close_fn = idmap_nss_close
 211 };
 212
 213 NTSTATUS idmap_nss_init(void)
 214 {
 215         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "nss", &nss_methods);
 216 }