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                         ZERO_STRUCT(null_sid);
  78                         idmap_cache_set_sid2uid(&null_sid, uid);
  79                 }
  80                 DEBUG(10, ("uid [%lu] not mapped\n", (unsigned long)uid));
  81                 return NT_STATUS_NONE_MAPPED;
  82         }
  83
  84         if (winbindd_use_idmap_cache()) {
  85                 idmap_cache_set_sid2uid(sid, uid);
  86         }
  87
  88         return NT_STATUS_OK;
  89 }
  90
  91 /*****************************************************************
  92  Returns SID mapped to the given GID.
  93  If mapping is not possible returns an error.
  94 *****************************************************************/
  95
  96 NTSTATUS idmap_gid_to_sid(const char *domname, struct dom_sid *sid, gid_t gid)
  97 {
  98         NTSTATUS ret;
  99         struct id_map map;
 100         bool expired;
 101
 102         DEBUG(10,("idmap_gid_to_sid: gid = [%lu], domain = '%s'\n",
 103                   (unsigned long)gid, domname?domname:"NULL"));
 104
 105         if (winbindd_use_idmap_cache()
 106             && idmap_cache_find_gid2sid(gid, sid, &expired)) {
 107                 DEBUG(10, ("idmap_cache_find_gid2sid found %u%s\n",
 108                         (unsigned int)gid,
 109                            expired ? " (expired)": ""));
 110                 if (expired && idmap_is_online()) {
 111                         DEBUG(10, ("revalidating expired entry\n"));
 112                         goto backend;
 113                 }
 114                 if (is_null_sid(sid)) {
 115                         DEBUG(10, ("Returning negative cache entry\n"));
 116                         return NT_STATUS_NONE_MAPPED;
 117                 }
 118                 DEBUG(10, ("Returning positive cache entry\n"));
 119                 return NT_STATUS_OK;
 120         }
 121
 122 backend:
 123         ZERO_STRUCT(map);
 124         map.sid = sid;
 125         map.xid.type = ID_TYPE_GID;
 126         map.xid.id = gid;
 127
 128         ret = idmap_backends_unixid_to_sid(domname, &map);
 129         if ( ! NT_STATUS_IS_OK(ret)) {
 130                 DEBUG(10, ("error mapping gid [%lu]\n", (unsigned long)gid));
 131                 return ret;
 132         }
 133
 134         if (map.status != ID_MAPPED) {
 135                 if (winbindd_use_idmap_cache()) {
 136                         struct dom_sid null_sid;
 137                         ZERO_STRUCT(null_sid);
 138                         idmap_cache_set_sid2gid(&null_sid, gid);
 139                 }
 140                 DEBUG(10, ("gid [%lu] not mapped\n", (unsigned long)gid));
 141                 return NT_STATUS_NONE_MAPPED;
 142         }
 143
 144         if (winbindd_use_idmap_cache()) {
 145                 idmap_cache_set_sid2gid(sid, gid);
 146         }
 147
 148         return NT_STATUS_OK;
 149 }
 150
 151 /*****************************************************************
 152  Returns the UID mapped to the given SID.
 153  If mapping is not possible or SID maps to a GID returns an error.
 154 *****************************************************************/
 155
 156 NTSTATUS idmap_sid_to_uid(const char *dom_name, struct dom_sid *sid, uid_t *uid)
 157 {
 158         NTSTATUS ret;
 159         struct id_map map;
 160         bool expired;
 161
 162         DEBUG(10,("idmap_sid_to_uid: sid = [%s], domain = '%s'\n",
 163                   sid_string_dbg(sid), dom_name));
 164
 165         if (winbindd_use_idmap_cache()
 166             && idmap_cache_find_sid2uid(sid, uid, &expired)) {
 167                 DEBUG(10, ("idmap_cache_find_sid2uid found %d%s\n",
 168                            (int)(*uid), expired ? " (expired)": ""));
 169                 if (expired && idmap_is_online()) {
 170                         DEBUG(10, ("revalidating expired entry\n"));
 171                         goto backend;
 172                 }
 173                 if ((*uid) == -1) {
 174                         DEBUG(10, ("Returning negative cache entry\n"));
 175                         return NT_STATUS_NONE_MAPPED;
 176                 }
 177                 DEBUG(10, ("Returning positive cache entry\n"));
 178                 return NT_STATUS_OK;
 179         }
 180
 181 backend:
 182         ZERO_STRUCT(map);
 183         map.sid = sid;
 184         map.xid.type = ID_TYPE_UID;
 185
 186         ret = idmap_backends_sid_to_unixid(dom_name, &map);
 187
 188         if (!NT_STATUS_IS_OK(ret)) {
 189                 DEBUG(10, ("idmap_backends_sid_to_unixid failed: %s\n",
 190                            nt_errstr(ret)));
 191                 if (winbindd_use_idmap_cache()) {
 192                         idmap_cache_set_sid2uid(sid, -1);
 193                 }
 194                 return ret;
 195         }
 196
 197         if (map.status != ID_MAPPED) {
 198                 DEBUG(10, ("sid [%s] is not mapped\n", sid_string_dbg(sid)));
 199                 if (winbindd_use_idmap_cache()) {
 200                         idmap_cache_set_sid2uid(sid, -1);
 201                 }
 202                 return NT_STATUS_NONE_MAPPED;
 203         }
 204
 205         if (map.xid.type != ID_TYPE_UID) {
 206                 DEBUG(10, ("sid [%s] not mapped to a uid "
 207                            "[%u,%u,%u]\n",
 208                            sid_string_dbg(sid),
 209                            map.status,
 210                            map.xid.type,
 211                            map.xid.id));
 212                 if (winbindd_use_idmap_cache()) {
 213                         idmap_cache_set_sid2uid(sid, -1);
 214                 }
 215                 return NT_STATUS_NONE_MAPPED;
 216         }
 217
 218         *uid = (uid_t)map.xid.id;
 219         if (winbindd_use_idmap_cache()) {
 220                 idmap_cache_set_sid2uid(sid, *uid);
 221         }
 222         return NT_STATUS_OK;
 223 }
 224
 225 /*****************************************************************
 226  Returns the GID mapped to the given SID.
 227  If mapping is not possible or SID maps to a UID returns an error.
 228 *****************************************************************/
 229
 230 NTSTATUS idmap_sid_to_gid(const char *domname, struct dom_sid *sid, gid_t *gid)
 231 {
 232         NTSTATUS ret;
 233         struct id_map map;
 234         bool expired;
 235
 236         DEBUG(10,("idmap_sid_to_gid: sid = [%s], domain = '%s'\n",
 237                   sid_string_dbg(sid), domname));
 238
 239         if (winbindd_use_idmap_cache()
 240             && idmap_cache_find_sid2gid(sid, gid, &expired)) {
 241                 DEBUG(10, ("idmap_cache_find_sid2gid found %d%s\n",
 242                            (int)(*gid), expired ? " (expired)": ""));
 243                 if (expired && idmap_is_online()) {
 244                         DEBUG(10, ("revalidating expired entry\n"));
 245                         goto backend;
 246                 }
 247                 if ((*gid) == -1) {
 248                         DEBUG(10, ("Returning negative cache entry\n"));
 249                         return NT_STATUS_NONE_MAPPED;
 250                 }
 251                 DEBUG(10, ("Returning positive cache entry\n"));
 252                 return NT_STATUS_OK;
 253         }
 254
 255 backend:
 256         ZERO_STRUCT(map);
 257         map.sid = sid;
 258         map.xid.type = ID_TYPE_GID;
 259
 260         ret = idmap_backends_sid_to_unixid(domname, &map);
 261
 262         if (!NT_STATUS_IS_OK(ret)) {
 263                 DEBUG(10, ("idmap_backends_sid_to_unixid failed: %s\n",
 264                            nt_errstr(ret)));
 265                 if (winbindd_use_idmap_cache()) {
 266                         idmap_cache_set_sid2gid(sid, -1);
 267                 }
 268                 return ret;
 269         }
 270
 271         if (map.status != ID_MAPPED) {
 272                 DEBUG(10, ("sid [%s] is not mapped\n", sid_string_dbg(sid)));
 273                 if (winbindd_use_idmap_cache()) {
 274                         idmap_cache_set_sid2gid(sid, -1);
 275                 }
 276                 return NT_STATUS_NONE_MAPPED;
 277         }
 278
 279         if (map.xid.type != ID_TYPE_GID) {
 280                 DEBUG(10, ("sid [%s] not mapped to a gid "
 281                            "[%u,%u,%u]\n",
 282                            sid_string_dbg(sid),
 283                            map.status,
 284                            map.xid.type,
 285                            map.xid.id));
 286                 if (winbindd_use_idmap_cache()) {
 287                         idmap_cache_set_sid2gid(sid, -1);
 288                 }
 289                 return NT_STATUS_NONE_MAPPED;
 290         }
 291
 292         *gid = map.xid.id;
 293         if (winbindd_use_idmap_cache()) {
 294                 idmap_cache_set_sid2gid(sid, *gid);
 295         }
 296         return NT_STATUS_OK;
 297 }
 298
 299 /**
 300  * check whether a given unix id is inside the filter range of an idmap domain
 301  */
 302 bool idmap_unix_id_is_in_range(uint32_t id, struct idmap_domain *dom)
 303 {
 304         if (id == 0) {
 305                 /* 0 is not an allowed unix id for id mapping */
 306                 return false;
 307         }
 308
 309         if ((dom->low_id && (id < dom->low_id)) ||
 310             (dom->high_id && (id > dom->high_id)))
 311         {
 312                 return false;
 313         }
 314
 315         return true;
 316 }