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, const char *compat_params)
  34 {
  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         ctx = talloc_new(dom);
  48         if ( ! ctx) {
  49                 DEBUG(0, ("Out of memory!\n"));
  50                 return NT_STATUS_NO_MEMORY;
  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                 winbind_on();
  87                 /* Lookup name from PDC using lsa_lookup_names() */
  88                 ret = winbind_lookup_name(dom->name, name, ids[i]->sid, &type);
  89                 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
 119
 120         talloc_free(ctx);
 121         return NT_STATUS_OK;
 122 }
 123
 124 /**********************************
 125  lookup a set of sids.
 126 **********************************/
 127
 128 static NTSTATUS idmap_nss_sids_to_unixids(struct idmap_domain *dom, struct id_map **ids)
 129 {
 130         TALLOC_CTX *ctx;
 131         int i;
 132
 133         ctx = talloc_new(dom);
 134         if ( ! ctx) {
 135                 DEBUG(0, ("Out of memory!\n"));
 136                 return NT_STATUS_NO_MEMORY;
 137         }
 138
 139         for (i = 0; ids[i]; i++) {
 140                 struct passwd *pw;
 141                 struct group *gr;
 142                 enum lsa_SidType type;
 143                 const char *dom_name = NULL;
 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                 winbind_on();
 150                 ret = winbind_lookup_sid(ctx, ids[i]->sid, &dom_name, &name, &type);
 151                 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
 163                         /* this will find also all lower case name and use username level */
 164
 165                         pw = Get_Pwnam(name);
 166                         if (pw) {
 167                                 ids[i]->xid.id = pw->pw_uid;
 168                                 ids[i]->xid.type = ID_TYPE_UID;
 169                                 ids[i]->status = ID_MAPPED;
 170                         }
 171                         break;
 172
 173                 case SID_NAME_DOM_GRP:
 174                 case SID_NAME_ALIAS:
 175                 case SID_NAME_WKN_GRP:
 176
 177                         gr = getgrnam(name);
 178                         if (gr) {
 179                                 ids[i]->xid.id = gr->gr_gid;
 180                                 ids[i]->xid.type = ID_TYPE_GID;
 181                                 ids[i]->status = ID_MAPPED;
 182                         }
 183                         break;
 184
 185                 default:
 186                         ids[i]->status = ID_UNKNOWN;
 187                         break;
 188                 }
 189         }
 190
 191         talloc_free(ctx);
 192         return NT_STATUS_OK;
 193 }
 194
 195 /**********************************
 196  Close the idmap tdb instance
 197 **********************************/
 198
 199 static NTSTATUS idmap_nss_close(struct idmap_domain *dom)
 200 {
 201         return NT_STATUS_OK;
 202 }
 203
 204 static struct idmap_methods nss_methods = {
 205
 206         .init = idmap_nss_int_init,
 207         .unixids_to_sids = idmap_nss_unixids_to_sids,
 208         .sids_to_unixids = idmap_nss_sids_to_unixids,
 209         .close_fn = idmap_nss_close
 210 };
 211
 212 NTSTATUS idmap_nss_init(void)
 213 {
 214         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "nss", &nss_methods);
 215 }