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