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         map.sid = sid;
  64         map.xid.type = ID_TYPE_UID;
  65         map.xid.id = uid;
  66
  67         ret = idmap_backends_unixid_to_sid(domname, &map);
  68         if ( ! NT_STATUS_IS_OK(ret)) {
  69                 DEBUG(10, ("error mapping uid [%lu]\n", (unsigned long)uid));
  70                 return ret;
  71         }
  72
  73         if (map.status != ID_MAPPED) {
  74                 if (winbindd_use_idmap_cache()) {
  75                         struct dom_sid null_sid;
  76                         ZERO_STRUCT(null_sid);
  77                         idmap_cache_set_sid2uid(&null_sid, uid);
  78                 }
  79                 DEBUG(10, ("uid [%lu] not mapped\n", (unsigned long)uid));
  80                 return NT_STATUS_NONE_MAPPED;
  81         }
  82
  83         if (winbindd_use_idmap_cache()) {
  84                 idmap_cache_set_sid2uid(sid, uid);
  85         }
  86
  87         return NT_STATUS_OK;
  88 }
  89
  90 /*****************************************************************
  91  Returns SID mapped to the given GID.
  92  If mapping is not possible returns an error.
  93 *****************************************************************/
  94
  95 NTSTATUS idmap_gid_to_sid(const char *domname, struct dom_sid *sid, gid_t gid)
  96 {
  97         NTSTATUS ret;
  98         struct id_map map;
  99         bool expired;
 100
 101         DEBUG(10,("idmap_gid_to_sid: gid = [%lu], domain = '%s'\n",
 102                   (unsigned long)gid, domname?domname:"NULL"));
 103
 104         if (winbindd_use_idmap_cache()
 105             && idmap_cache_find_gid2sid(gid, sid, &expired)) {
 106                 DEBUG(10, ("idmap_cache_find_gid2sid found %u%s\n",
 107                         (unsigned int)gid,
 108                            expired ? " (expired)": ""));
 109                 if (expired && idmap_is_online()) {
 110                         DEBUG(10, ("revalidating expired entry\n"));
 111                         goto backend;
 112                 }
 113                 if (is_null_sid(sid)) {
 114                         DEBUG(10, ("Returning negative cache entry\n"));
 115                         return NT_STATUS_NONE_MAPPED;
 116                 }
 117                 DEBUG(10, ("Returning positive cache entry\n"));
 118                 return NT_STATUS_OK;
 119         }
 120
 121 backend:
 122         map.sid = sid;
 123         map.xid.type = ID_TYPE_GID;
 124         map.xid.id = gid;
 125
 126         ret = idmap_backends_unixid_to_sid(domname, &map);
 127         if ( ! NT_STATUS_IS_OK(ret)) {
 128                 DEBUG(10, ("error mapping gid [%lu]\n", (unsigned long)gid));
 129                 return ret;
 130         }
 131
 132         if (map.status != ID_MAPPED) {
 133                 if (winbindd_use_idmap_cache()) {
 134                         struct dom_sid null_sid;
 135                         ZERO_STRUCT(null_sid);
 136                         idmap_cache_set_sid2gid(&null_sid, gid);
 137                 }
 138                 DEBUG(10, ("gid [%lu] not mapped\n", (unsigned long)gid));
 139                 return NT_STATUS_NONE_MAPPED;
 140         }
 141
 142         if (winbindd_use_idmap_cache()) {
 143                 idmap_cache_set_sid2gid(sid, gid);
 144         }
 145
 146         return NT_STATUS_OK;
 147 }
 148
 149 /*****************************************************************
 150  Returns the UID mapped to the given SID.
 151  If mapping is not possible or SID maps to a GID returns an error.
 152 *****************************************************************/
 153
 154 NTSTATUS idmap_sid_to_uid(const char *dom_name, struct dom_sid *sid, uid_t *uid)
 155 {
 156         NTSTATUS ret;
 157         struct id_map map;
 158         bool expired;
 159
 160         DEBUG(10,("idmap_sid_to_uid: sid = [%s], domain = '%s'\n",
 161                   sid_string_dbg(sid), dom_name));
 162
 163         if (winbindd_use_idmap_cache()
 164             && idmap_cache_find_sid2uid(sid, uid, &expired)) {
 165                 DEBUG(10, ("idmap_cache_find_sid2uid found %d%s\n",
 166                            (int)(*uid), expired ? " (expired)": ""));
 167                 if (expired && idmap_is_online()) {
 168                         DEBUG(10, ("revalidating expired entry\n"));
 169                         goto backend;
 170                 }
 171                 if ((*uid) == -1) {
 172                         DEBUG(10, ("Returning negative cache entry\n"));
 173                         return NT_STATUS_NONE_MAPPED;
 174                 }
 175                 DEBUG(10, ("Returning positive cache entry\n"));
 176                 return NT_STATUS_OK;
 177         }
 178
 179 backend:
 180         map.sid = sid;
 181         map.xid.type = ID_TYPE_UID;
 182
 183         ret = idmap_backends_sid_to_unixid(dom_name, &map);
 184
 185         if (!NT_STATUS_IS_OK(ret)) {
 186                 DEBUG(10, ("idmap_backends_sid_to_unixid failed: %s\n",
 187                            nt_errstr(ret)));
 188                 if (winbindd_use_idmap_cache()) {
 189                         idmap_cache_set_sid2uid(sid, -1);
 190                 }
 191                 return ret;
 192         }
 193
 194         if (map.status != ID_MAPPED) {
 195                 DEBUG(10, ("sid [%s] is not mapped\n", sid_string_dbg(sid)));
 196                 if (winbindd_use_idmap_cache()) {
 197                         idmap_cache_set_sid2uid(sid, -1);
 198                 }
 199                 return NT_STATUS_NONE_MAPPED;
 200         }
 201
 202         if (map.xid.type != ID_TYPE_UID) {
 203                 DEBUG(10, ("sid [%s] not mapped to a uid "
 204                            "[%u,%u,%u]\n",
 205                            sid_string_dbg(sid),
 206                            map.status,
 207                            map.xid.type,
 208                            map.xid.id));
 209                 if (winbindd_use_idmap_cache()) {
 210                         idmap_cache_set_sid2uid(sid, -1);
 211                 }
 212                 return NT_STATUS_NONE_MAPPED;
 213         }
 214
 215         *uid = (uid_t)map.xid.id;
 216         if (winbindd_use_idmap_cache()) {
 217                 idmap_cache_set_sid2uid(sid, *uid);
 218         }
 219         return NT_STATUS_OK;
 220 }
 221
 222 /*****************************************************************
 223  Returns the GID mapped to the given SID.
 224  If mapping is not possible or SID maps to a UID returns an error.
 225 *****************************************************************/
 226
 227 NTSTATUS idmap_sid_to_gid(const char *domname, struct dom_sid *sid, gid_t *gid)
 228 {
 229         NTSTATUS ret;
 230         struct id_map map;
 231         bool expired;
 232
 233         DEBUG(10,("idmap_sid_to_gid: sid = [%s], domain = '%s'\n",
 234                   sid_string_dbg(sid), domname));
 235
 236         if (winbindd_use_idmap_cache()
 237             && idmap_cache_find_sid2gid(sid, gid, &expired)) {
 238                 DEBUG(10, ("idmap_cache_find_sid2gid found %d%s\n",
 239                            (int)(*gid), expired ? " (expired)": ""));
 240                 if (expired && idmap_is_online()) {
 241                         DEBUG(10, ("revalidating expired entry\n"));
 242                         goto backend;
 243                 }
 244                 if ((*gid) == -1) {
 245                         DEBUG(10, ("Returning negative cache entry\n"));
 246                         return NT_STATUS_NONE_MAPPED;
 247                 }
 248                 DEBUG(10, ("Returning positive cache entry\n"));
 249                 return NT_STATUS_OK;
 250         }
 251
 252 backend:
 253         map.sid = sid;
 254         map.xid.type = ID_TYPE_GID;
 255
 256         ret = idmap_backends_sid_to_unixid(domname, &map);
 257
 258         if (!NT_STATUS_IS_OK(ret)) {
 259                 DEBUG(10, ("idmap_backends_sid_to_unixid failed: %s\n",
 260                            nt_errstr(ret)));
 261                 if (winbindd_use_idmap_cache()) {
 262                         idmap_cache_set_sid2gid(sid, -1);
 263                 }
 264                 return ret;
 265         }
 266
 267         if (map.status != ID_MAPPED) {
 268                 DEBUG(10, ("sid [%s] is not mapped\n", sid_string_dbg(sid)));
 269                 if (winbindd_use_idmap_cache()) {
 270                         idmap_cache_set_sid2gid(sid, -1);
 271                 }
 272                 return NT_STATUS_NONE_MAPPED;
 273         }
 274
 275         if (map.xid.type != ID_TYPE_GID) {
 276                 DEBUG(10, ("sid [%s] not mapped to a gid "
 277                            "[%u,%u,%u]\n",
 278                            sid_string_dbg(sid),
 279                            map.status,
 280                            map.xid.type,
 281                            map.xid.id));
 282                 if (winbindd_use_idmap_cache()) {
 283                         idmap_cache_set_sid2gid(sid, -1);
 284                 }
 285                 return NT_STATUS_NONE_MAPPED;
 286         }
 287
 288         *gid = map.xid.id;
 289         if (winbindd_use_idmap_cache()) {
 290                 idmap_cache_set_sid2gid(sid, *gid);
 291         }
 292         return NT_STATUS_OK;
 293 }
 294
 295 /**
 296  * check whether a given unix id is inside the filter range of an idmap domain
 297  */
 298 bool idmap_unix_id_is_in_range(uint32_t id, struct idmap_domain *dom)
 299 {
 300         if (id == 0) {
 301                 /* 0 is not an allowed unix id for id mapping */
 302                 return false;
 303         }
 304
 305         if ((dom->low_id && (id < dom->low_id)) ||
 306             (dom->high_id && (id > dom->high_id)))
 307         {
 308                 return false;
 309         }
 310
 311         return true;
 312 }