source3/winbindd/idmap_util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    ID Mapping
   4    Copyright (C) Simo Sorce 2003
   5    Copyright (C) Jeremy Allison 2006
   6    Copyright (C) Michael Adam 2010
   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 #include "includes.h"
  22 #include "winbindd.h"
  23 #include "winbindd_proto.h"
  24 #include "idmap.h"
  25 #include "idmap_cache.h"
  26 #include "../libcli/security/security.h"
  27 #include "secrets.h"
  28
  29 #undef DBGC_CLASS
  30 #define DBGC_CLASS DBGC_IDMAP
  31
  32 /*****************************************************************
  33  Returns the SID mapped to the given UID.
  34  If mapping is not possible returns an error.
  35 *****************************************************************/
  36
  37 NTSTATUS idmap_uid_to_sid(struct dom_sid *sid, uid_t uid)
  38 {
  39         NTSTATUS ret;
  40         struct id_map map;
  41         bool expired;
  42
  43         DEBUG(10, ("idmap_uid_to_sid: uid = [%lu]\n", (unsigned long)uid));
  44
  45         if (winbindd_use_idmap_cache()
  46             && idmap_cache_find_uid2sid(uid, sid, &expired)) {
  47                 DEBUG(10, ("idmap_cache_find_uid2sid found %u%s\n",
  48                         (unsigned int)uid,
  49                            expired ? " (expired)": ""));
  50                 if (expired && idmap_is_online()) {
  51                         DEBUG(10, ("revalidating expired entry\n"));
  52                         goto backend;
  53                 }
  54                 if (is_null_sid(sid)) {
  55                         DEBUG(10, ("Returning negative cache entry\n"));
  56                         return NT_STATUS_NONE_MAPPED;
  57                 }
  58                 DEBUG(10, ("Returning positive cache entry\n"));
  59                 return NT_STATUS_OK;
  60         }
  61
  62 backend:
  63         ZERO_STRUCT(map);
  64         map.sid = sid;
  65         map.xid.type = ID_TYPE_UID;
  66         map.xid.id = uid;
  67
  68         ret = idmap_backends_unixid_to_sid(&map);
  69         if ( ! NT_STATUS_IS_OK(ret)) {
  70                 DEBUG(10, ("error mapping uid [%lu]: %s\n", (unsigned long)uid,
  71                            nt_errstr(ret)));
  72                 map.status = ID_UNMAPPED;
  73         }
  74
  75         if (map.status != ID_MAPPED) {
  76                 if (winbindd_use_idmap_cache()) {
  77                         struct dom_sid null_sid;
  78                         struct unixid id;
  79                         id.type = ID_TYPE_UID;
  80                         id.id = uid;
  81                         ZERO_STRUCT(null_sid);
  82                         idmap_cache_set_sid2unixid(&null_sid, &id);
  83                 }
  84                 DEBUG(10, ("uid [%lu] not mapped\n", (unsigned long)uid));
  85                 return NT_STATUS_NONE_MAPPED;
  86         }
  87
  88         if (winbindd_use_idmap_cache()) {
  89                 idmap_cache_set_sid2unixid(sid, &map.xid);
  90         }
  91
  92         return NT_STATUS_OK;
  93 }
  94
  95 /*****************************************************************
  96  Returns SID mapped to the given GID.
  97  If mapping is not possible returns an error.
  98 *****************************************************************/
  99
 100 NTSTATUS idmap_gid_to_sid(struct dom_sid *sid, gid_t gid)
 101 {
 102         NTSTATUS ret;
 103         struct id_map map;
 104         bool expired;
 105
 106         DEBUG(10, ("idmap_gid_to_sid: gid = [%lu]\n", (unsigned long)gid));
 107
 108         if (winbindd_use_idmap_cache()
 109             && idmap_cache_find_gid2sid(gid, sid, &expired)) {
 110                 DEBUG(10, ("idmap_cache_find_gid2sid found %u%s\n",
 111                         (unsigned int)gid,
 112                            expired ? " (expired)": ""));
 113                 if (expired && idmap_is_online()) {
 114                         DEBUG(10, ("revalidating expired entry\n"));
 115                         goto backend;
 116                 }
 117                 if (is_null_sid(sid)) {
 118                         DEBUG(10, ("Returning negative cache entry\n"));
 119                         return NT_STATUS_NONE_MAPPED;
 120                 }
 121                 DEBUG(10, ("Returning positive cache entry\n"));
 122                 return NT_STATUS_OK;
 123         }
 124
 125 backend:
 126         ZERO_STRUCT(map);
 127         map.sid = sid;
 128         map.xid.type = ID_TYPE_GID;
 129         map.xid.id = gid;
 130
 131         ret = idmap_backends_unixid_to_sid(&map);
 132         if ( ! NT_STATUS_IS_OK(ret)) {
 133                 DEBUG(10, ("error mapping gid [%lu]: %s\n", (unsigned long)gid,
 134                            nt_errstr(ret)));
 135                 map.status = ID_UNMAPPED;
 136         }
 137
 138         if (map.status != ID_MAPPED) {
 139                 if (winbindd_use_idmap_cache()) {
 140                         struct dom_sid null_sid;
 141                         struct unixid id;
 142                         id.type = ID_TYPE_GID;
 143                         id.id = gid;
 144                         ZERO_STRUCT(null_sid);
 145                         idmap_cache_set_sid2unixid(&null_sid, &id);
 146                 }
 147                 DEBUG(10, ("gid [%lu] not mapped\n", (unsigned long)gid));
 148                 return NT_STATUS_NONE_MAPPED;
 149         }
 150
 151         if (winbindd_use_idmap_cache()) {
 152                 idmap_cache_set_sid2unixid(sid, &map.xid);
 153         }
 154
 155         return NT_STATUS_OK;
 156 }
 157
 158 /**
 159  * check whether a given unix id is inside the filter range of an idmap domain
 160  */
 161 bool idmap_unix_id_is_in_range(uint32_t id, struct idmap_domain *dom)
 162 {
 163         if (id == 0) {
 164                 /* 0 is not an allowed unix id for id mapping */
 165                 return false;
 166         }
 167
 168         if ((dom->low_id && (id < dom->low_id)) ||
 169             (dom->high_id && (id > dom->high_id)))
 170         {
 171                 return false;
 172         }
 173
 174         return true;
 175 }
 176
 177 /**
 178  * Helper for unixids_to_sids: find entry by id in mapping array,
 179  * search up to IDMAP_AD_MAX_IDS entries
 180  */
 181 struct id_map *idmap_find_map_by_id(struct id_map **maps, enum id_type type,
 182                                     uint32_t id)
 183 {
 184         int i;
 185
 186         for (i = 0; i < IDMAP_LDAP_MAX_IDS; i++) {
 187                 if (maps[i] == NULL) { /* end of the run */
 188                         return NULL;
 189                 }
 190                 if ((maps[i]->xid.type == type) && (maps[i]->xid.id == id)) {
 191                         return maps[i];
 192                 }
 193         }
 194
 195         return NULL;
 196 }
 197
 198 /**
 199  * Helper for sids_to_unix_ids: find entry by SID in mapping array,
 200  * search up to IDMAP_AD_MAX_IDS entries
 201  */
 202 struct id_map *idmap_find_map_by_sid(struct id_map **maps, struct dom_sid *sid)
 203 {
 204         int i;
 205
 206         for (i = 0; i < IDMAP_LDAP_MAX_IDS; i++) {
 207                 if (maps[i] == NULL) { /* end of the run */
 208                         return NULL;
 209                 }
 210                 if (dom_sid_equal(maps[i]->sid, sid)) {
 211                         return maps[i];
 212                 }
 213         }
 214
 215         return NULL;
 216 }
 217
 218 char *idmap_fetch_secret(const char *backend, const char *domain,
 219                          const char *identity)
 220 {
 221         char *tmp, *ret;
 222         int r;
 223
 224         r = asprintf(&tmp, "IDMAP_%s_%s", backend, domain);
 225
 226         if (r < 0)
 227                 return NULL;
 228
 229         /* make sure the key is case insensitive */
 230         if (!strupper_m(tmp)) {
 231                 SAFE_FREE(tmp);
 232                 return NULL;
 233         }
 234
 235         ret = secrets_fetch_generic(tmp, identity);
 236
 237         SAFE_FREE(tmp);
 238
 239         return ret;
 240 }