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 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, 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         if (! dom->initialized) {
  49                 return NT_STATUS_UNSUCCESSFUL;
  50         }
  51
  52         ctx = talloc_new(dom);
  53         if ( ! ctx) {
  54                 DEBUG(0, ("Out of memory!\n"));
  55                 return NT_STATUS_NO_MEMORY;
  56         }
  57
  58         for (i = 0; ids[i]; i++) {
  59                 struct passwd *pw;
  60                 struct group *gr;
  61                 const char *name;
  62                 enum lsa_SidType type;
  63                 BOOL ret;
  64
  65                 switch (ids[i]->xid.type) {
  66                 case ID_TYPE_UID:
  67                         pw = getpwuid((uid_t)ids[i]->xid.id);
  68
  69                         if (!pw) {
  70                                 ids[i]->status = ID_UNMAPPED;
  71                                 continue;
  72                         }
  73                         name = pw->pw_name;
  74                         break;
  75                 case ID_TYPE_GID:
  76                         gr = getgrgid((gid_t)ids[i]->xid.id);
  77
  78                         if (!gr) {
  79                                 ids[i]->status = ID_UNMAPPED;
  80                                 continue;
  81                         }
  82                         name = gr->gr_name;
  83                         break;
  84                 default: /* ?? */
  85                         ids[i]->status = ID_UNKNOWN;
  86                         continue;
  87                 }
  88
  89                 /* by default calls to winbindd are disabled
  90                    the following call will not recurse so this is safe */
  91                 winbind_on();
  92                 /* Lookup name from PDC using lsa_lookup_names() */
  93                 ret = winbind_lookup_name(dom->name, name, ids[i]->sid, &type);
  94                 winbind_off();
  95
  96                 if (!ret) {
  97                         /* TODO: how do we know if the name is really not mapped,
  98                          * or something just failed ? */
  99                         ids[i]->status = ID_UNMAPPED;
 100                         continue;
 101                 }
 102
 103                 switch (type) {
 104                 case SID_NAME_USER:
 105                         if (ids[i]->xid.type == ID_TYPE_UID) {
 106                                 ids[i]->status = ID_MAPPED;
 107                         }
 108                         break;
 109
 110                 case SID_NAME_DOM_GRP:
 111                 case SID_NAME_ALIAS:
 112                 case SID_NAME_WKN_GRP:
 113                         if (ids[i]->xid.type == ID_TYPE_GID) {
 114                                 ids[i]->status = ID_MAPPED;
 115                         }
 116                         break;
 117
 118                 default:
 119                         ids[i]->status = ID_UNKNOWN;
 120                         break;
 121                 }
 122         }
 123
 124
 125         talloc_free(ctx);
 126         return NT_STATUS_OK;
 127 }
 128
 129 /**********************************
 130  lookup a set of sids.
 131 **********************************/
 132
 133 static NTSTATUS idmap_nss_sids_to_unixids(struct idmap_domain *dom, struct id_map **ids)
 134 {
 135         TALLOC_CTX *ctx;
 136         int i;
 137
 138         if (! dom->initialized) {
 139                 return NT_STATUS_UNSUCCESSFUL;
 140         }
 141
 142         ctx = talloc_new(dom);
 143         if ( ! ctx) {
 144                 DEBUG(0, ("Out of memory!\n"));
 145                 return NT_STATUS_NO_MEMORY;
 146         }
 147
 148         for (i = 0; ids[i]; i++) {
 149                 struct passwd *pw;
 150                 struct group *gr;
 151                 enum lsa_SidType type;
 152                 const char *dom_name = NULL;
 153                 const char *name = NULL;
 154                 BOOL ret;
 155
 156                 /* by default calls to winbindd are disabled
 157                    the following call will not recurse so this is safe */
 158                 winbind_on();
 159                 ret = winbind_lookup_sid(ctx, ids[i]->sid, &dom_name, &name, &type);
 160                 winbind_off();
 161
 162                 if (!ret) {
 163                         /* TODO: how do we know if the name is really not mapped,
 164                          * or something just failed ? */
 165                         ids[i]->status = ID_UNMAPPED;
 166                         continue;
 167                 }
 168
 169                 switch (type) {
 170                 case SID_NAME_USER:
 171
 172                         /* this will find also all lower case name and use username level */
 173
 174                         pw = Get_Pwnam(name);
 175                         if (pw) {
 176                                 ids[i]->xid.id = pw->pw_uid;
 177                                 ids[i]->xid.type = ID_TYPE_UID;
 178                                 ids[i]->status = ID_MAPPED;
 179                         }
 180                         break;
 181
 182                 case SID_NAME_DOM_GRP:
 183                 case SID_NAME_ALIAS:
 184                 case SID_NAME_WKN_GRP:
 185
 186                         gr = getgrnam(name);
 187                         if (gr) {
 188                                 ids[i]->xid.id = gr->gr_gid;
 189                                 ids[i]->xid.type = ID_TYPE_GID;
 190                                 ids[i]->status = ID_MAPPED;
 191                         }
 192                         break;
 193
 194                 default:
 195                         ids[i]->status = ID_UNKNOWN;
 196                         break;
 197                 }
 198         }
 199
 200         talloc_free(ctx);
 201         return NT_STATUS_OK;
 202 }
 203
 204 /**********************************
 205  Close the idmap tdb instance
 206 **********************************/
 207
 208 static NTSTATUS idmap_nss_close(struct idmap_domain *dom)
 209 {
 210         return NT_STATUS_OK;
 211 }
 212
 213 static struct idmap_methods nss_methods = {
 214
 215         .init = idmap_nss_int_init,
 216         .unixids_to_sids = idmap_nss_unixids_to_sids,
 217         .sids_to_unixids = idmap_nss_sids_to_unixids,
 218         .close_fn = idmap_nss_close
 219 };
 220
 221 NTSTATUS idmap_nss_init(void)
 222 {
 223         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "nss", &nss_methods);
 224 }