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
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_IDMAP
  30
  31 /*****************************************************************
  32  Returns the SID mapped to the given UID.
  33  If mapping is not possible returns an error.
  34 *****************************************************************/
  35
  36 NTSTATUS idmap_uid_to_sid(const char *domname, struct dom_sid *sid, uid_t uid)
  37 {
  38         NTSTATUS ret;
  39         struct id_map map;
  40         bool expired;
  41
  42         DEBUG(10,("idmap_uid_to_sid: uid = [%lu], domain = '%s'\n",
  43                   (unsigned long)uid, domname?domname:"NULL"));
  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(domname, &map);
  69         if ( ! NT_STATUS_IS_OK(ret)) {
  70                 DEBUG(10, ("error mapping uid [%lu]\n", (unsigned long)uid));
  71                 return ret;
  72         }
  73
  74         if (map.status != ID_MAPPED) {
  75                 if (winbindd_use_idmap_cache()) {
  76                         struct dom_sid null_sid;
  77                         struct unixid id;
  78                         id.type = ID_TYPE_UID;
  79                         id.id = uid;
  80                         ZERO_STRUCT(null_sid);
  81                         idmap_cache_set_sid2unixid(&null_sid, &id);
  82                 }
  83                 DEBUG(10, ("uid [%lu] not mapped\n", (unsigned long)uid));
  84                 return NT_STATUS_NONE_MAPPED;
  85         }
  86
  87         if (winbindd_use_idmap_cache()) {
  88                 idmap_cache_set_sid2unixid(sid, &map.xid);
  89         }
  90
  91         return NT_STATUS_OK;
  92 }
  93
  94 /*****************************************************************
  95  Returns SID mapped to the given GID.
  96  If mapping is not possible returns an error.
  97 *****************************************************************/
  98
  99 NTSTATUS idmap_gid_to_sid(const char *domname, struct dom_sid *sid, gid_t gid)
 100 {
 101         NTSTATUS ret;
 102         struct id_map map;
 103         bool expired;
 104
 105         DEBUG(10,("idmap_gid_to_sid: gid = [%lu], domain = '%s'\n",
 106                   (unsigned long)gid, domname?domname:"NULL"));
 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(domname, &map);
 132         if ( ! NT_STATUS_IS_OK(ret)) {
 133                 DEBUG(10, ("error mapping gid [%lu]\n", (unsigned long)gid));
 134                 return ret;
 135         }
 136
 137         if (map.status != ID_MAPPED) {
 138                 if (winbindd_use_idmap_cache()) {
 139                         struct dom_sid null_sid;
 140                         struct unixid id;
 141                         id.type = ID_TYPE_GID;
 142                         id.id = gid;
 143                         ZERO_STRUCT(null_sid);
 144                         idmap_cache_set_sid2unixid(&null_sid, &id);
 145                 }
 146                 DEBUG(10, ("gid [%lu] not mapped\n", (unsigned long)gid));
 147                 return NT_STATUS_NONE_MAPPED;
 148         }
 149
 150         if (winbindd_use_idmap_cache()) {
 151                 idmap_cache_set_sid2unixid(sid, &map.xid);
 152         }
 153
 154         return NT_STATUS_OK;
 155 }
 156
 157 /**
 158  * check whether a given unix id is inside the filter range of an idmap domain
 159  */
 160 bool idmap_unix_id_is_in_range(uint32_t id, struct idmap_domain *dom)
 161 {
 162         if (id == 0) {
 163                 /* 0 is not an allowed unix id for id mapping */
 164                 return false;
 165         }
 166
 167         if ((dom->low_id && (id < dom->low_id)) ||
 168             (dom->high_id && (id > dom->high_id)))
 169         {
 170                 return false;
 171         }
 172
 173         return true;
 174 }
 175
 176 /**
 177  * Helper for unixids_to_sids: find entry by id in mapping array,
 178  * search up to IDMAP_AD_MAX_IDS entries
 179  */
 180 struct id_map *idmap_find_map_by_id(struct id_map **maps, enum id_type type,
 181                                     uint32_t id)
 182 {
 183         int i;
 184
 185         for (i = 0; i < IDMAP_LDAP_MAX_IDS; i++) {
 186                 if (maps[i] == NULL) { /* end of the run */
 187                         return NULL;
 188                 }
 189                 if ((maps[i]->xid.type == type) && (maps[i]->xid.id == id)) {
 190                         return maps[i];
 191                 }
 192         }
 193
 194         return NULL;
 195 }
 196
 197 /**
 198  * Helper for sids_to_unix_ids: find entry by SID in mapping array,
 199  * search up to IDMAP_AD_MAX_IDS entries
 200  */
 201 struct id_map *idmap_find_map_by_sid(struct id_map **maps, struct dom_sid *sid)
 202 {
 203         int i;
 204
 205         for (i = 0; i < IDMAP_LDAP_MAX_IDS; i++) {
 206                 if (maps[i] == NULL) { /* end of the run */
 207                         return NULL;
 208                 }
 209                 if (dom_sid_equal(maps[i]->sid, sid)) {
 210                         return maps[i];
 211                 }
 212         }
 213
 214         return NULL;
 215 }