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
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.*/
  19
  20 #include "includes.h"
  21 #include "winbindd.h"
  22 #include "winbindd_proto.h"
  23 #include "idmap.h"
  24 #include "idmap_cache.h"
  25 #include "../libcli/security/security.h"
  26
  27 #undef DBGC_CLASS
  28 #define DBGC_CLASS DBGC_IDMAP
  29
  30 /*****************************************************************
  31  Returns the SID mapped to the given UID.
  32  If mapping is not possible returns an error.
  33 *****************************************************************/
  34
  35 NTSTATUS idmap_uid_to_sid(const char *domname, struct dom_sid *sid, uid_t uid)
  36 {
  37         NTSTATUS ret;
  38         struct id_map map;
  39         bool expired;
  40
  41         DEBUG(10,("idmap_uid_to_sid: uid = [%lu], domain = '%s'\n",
  42                   (unsigned long)uid, domname?domname:"NULL"));
  43
  44         if (winbindd_use_idmap_cache()
  45             && idmap_cache_find_uid2sid(uid, sid, &expired)) {
  46                 DEBUG(10, ("idmap_cache_find_uid2sid found %u%s\n",
  47                         (unsigned int)uid,
  48                            expired ? " (expired)": ""));
  49                 if (expired && idmap_is_online()) {
  50                         DEBUG(10, ("revalidating expired entry\n"));
  51                         goto backend;
  52                 }
  53                 if (is_null_sid(sid)) {
  54                         DEBUG(10, ("Returning negative cache entry\n"));
  55                         return NT_STATUS_NONE_MAPPED;
  56                 }
  57                 DEBUG(10, ("Returning positive cache entry\n"));
  58                 return NT_STATUS_OK;
  59         }
  60
  61 backend:
  62         map.sid = sid;
  63         map.xid.type = ID_TYPE_UID;
  64         map.xid.id = uid;
  65
  66         ret = idmap_backends_unixid_to_sid(domname, &map);
  67         if ( ! NT_STATUS_IS_OK(ret)) {
  68                 DEBUG(10, ("error mapping uid [%lu]\n", (unsigned long)uid));
  69                 return ret;
  70         }
  71
  72         if (map.status != ID_MAPPED) {
  73                 if (winbindd_use_idmap_cache()) {
  74                         struct dom_sid null_sid;
  75                         ZERO_STRUCT(null_sid);
  76                         idmap_cache_set_sid2uid(&null_sid, uid);
  77                 }
  78                 DEBUG(10, ("uid [%lu] not mapped\n", (unsigned long)uid));
  79                 return NT_STATUS_NONE_MAPPED;
  80         }
  81
  82         if (winbindd_use_idmap_cache()) {
  83                 idmap_cache_set_sid2uid(sid, uid);
  84         }
  85
  86         return NT_STATUS_OK;
  87 }
  88
  89 /*****************************************************************
  90  Returns SID mapped to the given GID.
  91  If mapping is not possible returns an error.
  92 *****************************************************************/
  93
  94 NTSTATUS idmap_gid_to_sid(const char *domname, struct dom_sid *sid, gid_t gid)
  95 {
  96         NTSTATUS ret;
  97         struct id_map map;
  98         bool expired;
  99
 100         DEBUG(10,("idmap_gid_to_sid: gid = [%lu], domain = '%s'\n",
 101                   (unsigned long)gid, domname?domname:"NULL"));
 102
 103         if (winbindd_use_idmap_cache()
 104             && idmap_cache_find_gid2sid(gid, sid, &expired)) {
 105                 DEBUG(10, ("idmap_cache_find_gid2sid found %u%s\n",
 106                         (unsigned int)gid,
 107                            expired ? " (expired)": ""));
 108                 if (expired && idmap_is_online()) {
 109                         DEBUG(10, ("revalidating expired entry\n"));
 110                         goto backend;
 111                 }
 112                 if (is_null_sid(sid)) {
 113                         DEBUG(10, ("Returning negative cache entry\n"));
 114                         return NT_STATUS_NONE_MAPPED;
 115                 }
 116                 DEBUG(10, ("Returning positive cache entry\n"));
 117                 return NT_STATUS_OK;
 118         }
 119
 120 backend:
 121         map.sid = sid;
 122         map.xid.type = ID_TYPE_GID;
 123         map.xid.id = gid;
 124
 125         ret = idmap_backends_unixid_to_sid(domname, &map);
 126         if ( ! NT_STATUS_IS_OK(ret)) {
 127                 DEBUG(10, ("error mapping gid [%lu]\n", (unsigned long)gid));
 128                 return ret;
 129         }
 130
 131         if (map.status != ID_MAPPED) {
 132                 if (winbindd_use_idmap_cache()) {
 133                         struct dom_sid null_sid;
 134                         ZERO_STRUCT(null_sid);
 135                         idmap_cache_set_sid2uid(&null_sid, gid);
 136                 }
 137                 DEBUG(10, ("gid [%lu] not mapped\n", (unsigned long)gid));
 138                 return NT_STATUS_NONE_MAPPED;
 139         }
 140
 141         if (winbindd_use_idmap_cache()) {
 142                 idmap_cache_set_sid2gid(sid, gid);
 143         }
 144
 145         return NT_STATUS_OK;
 146 }
 147
 148 /*****************************************************************
 149  Returns the UID mapped to the given SID.
 150  If mapping is not possible or SID maps to a GID returns an error.
 151 *****************************************************************/
 152
 153 NTSTATUS idmap_sid_to_uid(const char *dom_name, struct dom_sid *sid, uid_t *uid)
 154 {
 155         NTSTATUS ret;
 156         struct id_map map;
 157         bool expired;
 158
 159         DEBUG(10,("idmap_sid_to_uid: sid = [%s], domain = '%s'\n",
 160                   sid_string_dbg(sid), dom_name));
 161
 162         if (winbindd_use_idmap_cache()
 163             && idmap_cache_find_sid2uid(sid, uid, &expired)) {
 164                 DEBUG(10, ("idmap_cache_find_sid2uid found %d%s\n",
 165                            (int)(*uid), expired ? " (expired)": ""));
 166                 if (expired && idmap_is_online()) {
 167                         DEBUG(10, ("revalidating expired entry\n"));
 168                         goto backend;
 169                 }
 170                 if ((*uid) == -1) {
 171                         DEBUG(10, ("Returning negative cache entry\n"));
 172                         return NT_STATUS_NONE_MAPPED;
 173                 }
 174                 DEBUG(10, ("Returning positive cache entry\n"));
 175                 return NT_STATUS_OK;
 176         }
 177
 178 backend:
 179         map.sid = sid;
 180         map.xid.type = ID_TYPE_UID;
 181
 182         ret = idmap_backends_sid_to_unixid(dom_name, &map);
 183
 184         if (!NT_STATUS_IS_OK(ret)) {
 185                 DEBUG(10, ("idmap_backends_sid_to_unixid failed: %s\n",
 186                            nt_errstr(ret)));
 187                 if (winbindd_use_idmap_cache()) {
 188                         idmap_cache_set_sid2uid(sid, -1);
 189                 }
 190                 return ret;
 191         }
 192
 193         if (map.status != ID_MAPPED) {
 194                 DEBUG(10, ("sid [%s] is not mapped\n", sid_string_dbg(sid)));
 195                 if (winbindd_use_idmap_cache()) {
 196                         idmap_cache_set_sid2uid(sid, -1);
 197                 }
 198                 return NT_STATUS_NONE_MAPPED;
 199         }
 200
 201         if (map.xid.type != ID_TYPE_UID) {
 202                 DEBUG(10, ("sid [%s] not mapped to a uid "
 203                            "[%u,%u,%u]\n",
 204                            sid_string_dbg(sid),
 205                            map.status,
 206                            map.xid.type,
 207                            map.xid.id));
 208                 if (winbindd_use_idmap_cache()) {
 209                         idmap_cache_set_sid2uid(sid, -1);
 210                 }
 211                 return NT_STATUS_NONE_MAPPED;
 212         }
 213
 214         *uid = (uid_t)map.xid.id;
 215         if (winbindd_use_idmap_cache()) {
 216                 idmap_cache_set_sid2uid(sid, *uid);
 217         }
 218         return NT_STATUS_OK;
 219 }
 220
 221 /*****************************************************************
 222  Returns the GID mapped to the given SID.
 223  If mapping is not possible or SID maps to a UID returns an error.
 224 *****************************************************************/
 225
 226 NTSTATUS idmap_sid_to_gid(const char *domname, struct dom_sid *sid, gid_t *gid)
 227 {
 228         NTSTATUS ret;
 229         struct id_map map;
 230         bool expired;
 231
 232         DEBUG(10,("idmap_sid_to_gid: sid = [%s], domain = '%s'\n",
 233                   sid_string_dbg(sid), domname));
 234
 235         if (winbindd_use_idmap_cache()
 236             && idmap_cache_find_sid2gid(sid, gid, &expired)) {
 237                 DEBUG(10, ("idmap_cache_find_sid2gid found %d%s\n",
 238                            (int)(*gid), expired ? " (expired)": ""));
 239                 if (expired && idmap_is_online()) {
 240                         DEBUG(10, ("revalidating expired entry\n"));
 241                         goto backend;
 242                 }
 243                 if ((*gid) == -1) {
 244                         DEBUG(10, ("Returning negative cache entry\n"));
 245                         return NT_STATUS_NONE_MAPPED;
 246                 }
 247                 DEBUG(10, ("Returning positive cache entry\n"));
 248                 return NT_STATUS_OK;
 249         }
 250
 251 backend:
 252         map.sid = sid;
 253         map.xid.type = ID_TYPE_GID;
 254
 255         ret = idmap_backends_sid_to_unixid(domname, &map);
 256
 257         if (!NT_STATUS_IS_OK(ret)) {
 258                 DEBUG(10, ("idmap_backends_sid_to_unixid failed: %s\n",
 259                            nt_errstr(ret)));
 260                 if (winbindd_use_idmap_cache()) {
 261                         idmap_cache_set_sid2uid(sid, -1);
 262                 }
 263                 return ret;
 264         }
 265
 266         if (map.status != ID_MAPPED) {
 267                 DEBUG(10, ("sid [%s] is not mapped\n", sid_string_dbg(sid)));
 268                 if (winbindd_use_idmap_cache()) {
 269                         idmap_cache_set_sid2uid(sid, -1);
 270                 }
 271                 return NT_STATUS_NONE_MAPPED;
 272         }
 273
 274         if (map.xid.type != ID_TYPE_GID) {
 275                 DEBUG(10, ("sid [%s] not mapped to a gid "
 276                            "[%u,%u,%u]\n",
 277                            sid_string_dbg(sid),
 278                            map.status,
 279                            map.xid.type,
 280                            map.xid.id));
 281                 if (winbindd_use_idmap_cache()) {
 282                         idmap_cache_set_sid2gid(sid, -1);
 283                 }
 284                 return NT_STATUS_NONE_MAPPED;
 285         }
 286
 287         *gid = map.xid.id;
 288         if (winbindd_use_idmap_cache()) {
 289                 idmap_cache_set_sid2gid(sid, *gid);
 290         }
 291         return NT_STATUS_OK;
 292 }
 293
 294 /**
 295  * check whether a given unix id is inside the filter range of an idmap domain
 296  */
 297 bool idmap_unix_id_is_in_range(uint32_t id, struct idmap_domain *dom)
 298 {
 299         if (id == 0) {
 300                 /* 0 is not an allowed unix id for id mapping */
 301                 return false;
 302         }
 303
 304         if ((dom->low_id && (id < dom->low_id)) ||
 305             (dom->high_id && (id > dom->high_id)))
 306         {
 307                 return false;
 308         }
 309
 310         return true;
 311 }