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
  22 #undef DBGC_CLASS
  23 #define DBGC_CLASS DBGC_IDMAP
  24
  25 /*****************************************************************
  26  Returns the SID mapped to the given UID.
  27  If mapping is not possible returns an error.
  28 *****************************************************************/
  29
  30 NTSTATUS idmap_uid_to_sid(const char *domname, DOM_SID *sid, uid_t uid)
  31 {
  32         NTSTATUS ret;
  33         struct id_map map;
  34         bool expired;
  35
  36         DEBUG(10,("idmap_uid_to_sid: uid = [%lu], domain = '%s'\n",
  37                   (unsigned long)uid, domname?domname:"NULL"));
  38
  39         if (idmap_cache_find_uid2sid(uid, sid, &expired)) {
  40                 DEBUG(10, ("idmap_cache_find_uid2sid found %d%s\n", uid,
  41                            expired ? " (expired)": ""));
  42                 if (expired && idmap_is_online()) {
  43                         DEBUG(10, ("revalidating expired entry\n"));
  44                         goto backend;
  45                 }
  46                 if (is_null_sid(sid)) {
  47                         DEBUG(10, ("Returning negative cache entry\n"));
  48                         return NT_STATUS_NONE_MAPPED;
  49                 }
  50                 DEBUG(10, ("Returning positive cache entry\n"));
  51                 return NT_STATUS_OK;
  52         }
  53
  54 backend:
  55         map.sid = sid;
  56         map.xid.type = ID_TYPE_UID;
  57         map.xid.id = uid;
  58
  59         ret = idmap_backends_unixid_to_sid(domname, &map);
  60         if ( ! NT_STATUS_IS_OK(ret)) {
  61                 DEBUG(10, ("error mapping uid [%lu]\n", (unsigned long)uid));
  62                 return ret;
  63         }
  64
  65         if (map.status != ID_MAPPED) {
  66                 struct dom_sid null_sid;
  67                 ZERO_STRUCT(null_sid);
  68                 idmap_cache_set_sid2uid(&null_sid, uid);
  69                 DEBUG(10, ("uid [%lu] not mapped\n", (unsigned long)uid));
  70                 return NT_STATUS_NONE_MAPPED;
  71         }
  72
  73         idmap_cache_set_sid2uid(sid, uid);
  74
  75         return NT_STATUS_OK;
  76 }
  77
  78 /*****************************************************************
  79  Returns SID mapped to the given GID.
  80  If mapping is not possible returns an error.
  81 *****************************************************************/
  82
  83 NTSTATUS idmap_gid_to_sid(const char *domname, DOM_SID *sid, gid_t gid)
  84 {
  85         NTSTATUS ret;
  86         struct id_map map;
  87         bool expired;
  88
  89         DEBUG(10,("idmap_gid_to_si: gid = [%lu], domain = '%s'\n",
  90                   (unsigned long)gid, domname?domname:"NULL"));
  91
  92         if (idmap_cache_find_gid2sid(gid, sid, &expired)) {
  93                 DEBUG(10, ("idmap_cache_find_gid2sid found %d%s\n", gid,
  94                            expired ? " (expired)": ""));
  95                 if (expired && idmap_is_online()) {
  96                         DEBUG(10, ("revalidating expired entry\n"));
  97                         goto backend;
  98                 }
  99                 if (is_null_sid(sid)) {
 100                         DEBUG(10, ("Returning negative cache entry\n"));
 101                         return NT_STATUS_NONE_MAPPED;
 102                 }
 103                 DEBUG(10, ("Returning positive cache entry\n"));
 104                 return NT_STATUS_OK;
 105         }
 106
 107 backend:
 108         map.sid = sid;
 109         map.xid.type = ID_TYPE_GID;
 110         map.xid.id = gid;
 111
 112         ret = idmap_backends_unixid_to_sid(domname, &map);
 113         if ( ! NT_STATUS_IS_OK(ret)) {
 114                 DEBUG(10, ("error mapping gid [%lu]\n", (unsigned long)gid));
 115                 return ret;
 116         }
 117
 118         if (map.status != ID_MAPPED) {
 119                 struct dom_sid null_sid;
 120                 ZERO_STRUCT(null_sid);
 121                 idmap_cache_set_sid2uid(&null_sid, gid);
 122                 DEBUG(10, ("gid [%lu] not mapped\n", (unsigned long)gid));
 123                 return NT_STATUS_NONE_MAPPED;
 124         }
 125
 126         idmap_cache_set_sid2gid(sid, gid);
 127
 128         return NT_STATUS_OK;
 129 }
 130
 131 /*****************************************************************
 132  Returns the UID mapped to the given SID.
 133  If mapping is not possible or SID maps to a GID returns an error.
 134 *****************************************************************/
 135
 136 NTSTATUS idmap_sid_to_uid(const char *dom_name, DOM_SID *sid, uid_t *uid)
 137 {
 138         NTSTATUS ret;
 139         struct id_map map;
 140         bool expired;
 141
 142         DEBUG(10,("idmap_sid_to_uid: sid = [%s], domain = '%s'\n",
 143                   sid_string_dbg(sid), dom_name));
 144
 145         if (idmap_cache_find_sid2uid(sid, uid, &expired)) {
 146                 DEBUG(10, ("idmap_cache_find_sid2uid found %d%s\n",
 147                            (int)(*uid), expired ? " (expired)": ""));
 148                 if (expired && idmap_is_online()) {
 149                         DEBUG(10, ("revalidating expired entry\n"));
 150                         goto backend;
 151                 }
 152                 if ((*uid) == -1) {
 153                         DEBUG(10, ("Returning negative cache entry\n"));
 154                         return NT_STATUS_NONE_MAPPED;
 155                 }
 156                 DEBUG(10, ("Returning positive cache entry\n"));
 157                 return NT_STATUS_OK;
 158         }
 159
 160 backend:
 161         map.sid = sid;
 162         map.xid.type = ID_TYPE_UID;
 163
 164         ret = idmap_backends_sid_to_unixid(dom_name, &map);
 165
 166         if (NT_STATUS_IS_OK(ret) && (map.status == ID_MAPPED)) {
 167                 if (map.xid.type != ID_TYPE_UID) {
 168                         DEBUG(10, ("sid [%s] not mapped to a uid "
 169                                    "[%u,%u,%u]\n",
 170                                    sid_string_dbg(sid),
 171                                    map.status,
 172                                    map.xid.type,
 173                                    map.xid.id));
 174                         idmap_cache_set_sid2uid(sid, -1);
 175                         return NT_STATUS_NONE_MAPPED;
 176                 }
 177                 goto done;
 178         }
 179
 180         if (dom_name[0] != '\0') {
 181                 /*
 182                  * We had the task to go to a specific domain which
 183                  * could not answer our request. Fail.
 184                  */
 185                 idmap_cache_set_sid2uid(sid, -1);
 186                 return NT_STATUS_NONE_MAPPED;
 187         }
 188
 189         ret = idmap_new_mapping(sid, ID_TYPE_UID, &map.xid);
 190
 191         if (!NT_STATUS_IS_OK(ret)) {
 192                 DEBUG(10, ("idmap_new_mapping failed: %s\n",
 193                            nt_errstr(ret)));
 194                 idmap_cache_set_sid2uid(sid, -1);
 195                 return ret;
 196         }
 197
 198 done:
 199         *uid = (uid_t)map.xid.id;
 200         idmap_cache_set_sid2uid(sid, *uid);
 201         return NT_STATUS_OK;
 202 }
 203
 204 /*****************************************************************
 205  Returns the GID mapped to the given SID.
 206  If mapping is not possible or SID maps to a UID returns an error.
 207 *****************************************************************/
 208
 209 NTSTATUS idmap_sid_to_gid(const char *domname, DOM_SID *sid, gid_t *gid)
 210 {
 211         NTSTATUS ret;
 212         struct id_map map;
 213         bool expired;
 214
 215         DEBUG(10,("idmap_sid_to_gid: sid = [%s], domain = '%s'\n",
 216                   sid_string_dbg(sid), domname));
 217
 218         if (idmap_cache_find_sid2gid(sid, gid, &expired)) {
 219                 DEBUG(10, ("idmap_cache_find_sid2gid found %d%s\n",
 220                            (int)(*gid), expired ? " (expired)": ""));
 221                 if (expired && idmap_is_online()) {
 222                         DEBUG(10, ("revalidating expired entry\n"));
 223                         goto backend;
 224                 }
 225                 if ((*gid) == -1) {
 226                         DEBUG(10, ("Returning negative cache entry\n"));
 227                         return NT_STATUS_NONE_MAPPED;
 228                 }
 229                 DEBUG(10, ("Returning positive cache entry\n"));
 230                 return NT_STATUS_OK;
 231         }
 232
 233 backend:
 234         map.sid = sid;
 235         map.xid.type = ID_TYPE_GID;
 236
 237         ret = idmap_backends_sid_to_unixid(domname, &map);
 238         if (NT_STATUS_IS_OK(ret) && (map.status == ID_MAPPED)) {
 239                 if (map.xid.type != ID_TYPE_GID) {
 240                         DEBUG(10, ("sid [%s] not mapped to a gid "
 241                                    "[%u,%u,%u]\n",
 242                                    sid_string_dbg(sid),
 243                                    map.status,
 244                                    map.xid.type,
 245                                    map.xid.id));
 246                         idmap_cache_set_sid2gid(sid, -1);
 247                         return NT_STATUS_NONE_MAPPED;
 248                 }
 249                 goto done;
 250         }
 251
 252         if (domname[0] != '\0') {
 253                 /*
 254                  * We had the task to go to a specific domain which
 255                  * could not answer our request. Fail.
 256                  */
 257                 idmap_cache_set_sid2uid(sid, -1);
 258                 return NT_STATUS_NONE_MAPPED;
 259         }
 260
 261         ret = idmap_new_mapping(sid, ID_TYPE_GID, &map.xid);
 262
 263         if (!NT_STATUS_IS_OK(ret)) {
 264                 DEBUG(10, ("idmap_new_mapping failed: %s\n",
 265                            nt_errstr(ret)));
 266                 idmap_cache_set_sid2gid(sid, -1);
 267                 return ret;
 268         }
 269
 270 done:
 271         *gid = map.xid.id;
 272         idmap_cache_set_sid2gid(sid, *gid);
 273         return NT_STATUS_OK;
 274 }