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
  24 #undef DBGC_CLASS
  25 #define DBGC_CLASS DBGC_IDMAP
  26
  27 /*****************************************************************
  28  Returns the SID mapped to the given UID.
  29  If mapping is not possible returns an error.
  30 *****************************************************************/
  31
  32 NTSTATUS idmap_uid_to_sid(const char *domname, DOM_SID *sid, uid_t uid)
  33 {
  34         NTSTATUS ret;
  35         struct id_map map;
  36         bool expired;
  37
  38         DEBUG(10,("idmap_uid_to_sid: uid = [%lu], domain = '%s'\n",
  39                   (unsigned long)uid, domname?domname:"NULL"));
  40
  41         if (winbindd_use_idmap_cache()
  42             && idmap_cache_find_uid2sid(uid, sid, &expired)) {
  43                 DEBUG(10, ("idmap_cache_find_uid2sid found %d%s\n", uid,
  44                            expired ? " (expired)": ""));
  45                 if (expired && idmap_is_online()) {
  46                         DEBUG(10, ("revalidating expired entry\n"));
  47                         goto backend;
  48                 }
  49                 if (is_null_sid(sid)) {
  50                         DEBUG(10, ("Returning negative cache entry\n"));
  51                         return NT_STATUS_NONE_MAPPED;
  52                 }
  53                 DEBUG(10, ("Returning positive cache entry\n"));
  54                 return NT_STATUS_OK;
  55         }
  56
  57 backend:
  58         map.sid = sid;
  59         map.xid.type = ID_TYPE_UID;
  60         map.xid.id = uid;
  61
  62         ret = idmap_backends_unixid_to_sid(domname, &map);
  63         if ( ! NT_STATUS_IS_OK(ret)) {
  64                 DEBUG(10, ("error mapping uid [%lu]\n", (unsigned long)uid));
  65                 return ret;
  66         }
  67
  68         if (map.status != ID_MAPPED) {
  69                 if (winbindd_use_idmap_cache()) {
  70                         struct dom_sid null_sid;
  71                         ZERO_STRUCT(null_sid);
  72                         idmap_cache_set_sid2uid(&null_sid, uid);
  73                 }
  74                 DEBUG(10, ("uid [%lu] not mapped\n", (unsigned long)uid));
  75                 return NT_STATUS_NONE_MAPPED;
  76         }
  77
  78         if (winbindd_use_idmap_cache()) {
  79                 idmap_cache_set_sid2uid(sid, uid);
  80         }
  81
  82         return NT_STATUS_OK;
  83 }
  84
  85 /*****************************************************************
  86  Returns SID mapped to the given GID.
  87  If mapping is not possible returns an error.
  88 *****************************************************************/
  89
  90 NTSTATUS idmap_gid_to_sid(const char *domname, DOM_SID *sid, gid_t gid)
  91 {
  92         NTSTATUS ret;
  93         struct id_map map;
  94         bool expired;
  95
  96         DEBUG(10,("idmap_gid_to_si: gid = [%lu], domain = '%s'\n",
  97                   (unsigned long)gid, domname?domname:"NULL"));
  98
  99         if (winbindd_use_idmap_cache()
 100             && idmap_cache_find_gid2sid(gid, sid, &expired)) {
 101                 DEBUG(10, ("idmap_cache_find_gid2sid found %d%s\n", gid,
 102                            expired ? " (expired)": ""));
 103                 if (expired && idmap_is_online()) {
 104                         DEBUG(10, ("revalidating expired entry\n"));
 105                         goto backend;
 106                 }
 107                 if (is_null_sid(sid)) {
 108                         DEBUG(10, ("Returning negative cache entry\n"));
 109                         return NT_STATUS_NONE_MAPPED;
 110                 }
 111                 DEBUG(10, ("Returning positive cache entry\n"));
 112                 return NT_STATUS_OK;
 113         }
 114
 115 backend:
 116         map.sid = sid;
 117         map.xid.type = ID_TYPE_GID;
 118         map.xid.id = gid;
 119
 120         ret = idmap_backends_unixid_to_sid(domname, &map);
 121         if ( ! NT_STATUS_IS_OK(ret)) {
 122                 DEBUG(10, ("error mapping gid [%lu]\n", (unsigned long)gid));
 123                 return ret;
 124         }
 125
 126         if (map.status != ID_MAPPED) {
 127                 if (winbindd_use_idmap_cache()) {
 128                         struct dom_sid null_sid;
 129                         ZERO_STRUCT(null_sid);
 130                         idmap_cache_set_sid2uid(&null_sid, gid);
 131                 }
 132                 DEBUG(10, ("gid [%lu] not mapped\n", (unsigned long)gid));
 133                 return NT_STATUS_NONE_MAPPED;
 134         }
 135
 136         if (winbindd_use_idmap_cache()) {
 137                 idmap_cache_set_sid2gid(sid, gid);
 138         }
 139
 140         return NT_STATUS_OK;
 141 }
 142
 143 /*****************************************************************
 144  Returns the UID mapped to the given SID.
 145  If mapping is not possible or SID maps to a GID returns an error.
 146 *****************************************************************/
 147
 148 NTSTATUS idmap_sid_to_uid(const char *dom_name, DOM_SID *sid, uid_t *uid)
 149 {
 150         NTSTATUS ret;
 151         struct id_map map;
 152         bool expired;
 153
 154         DEBUG(10,("idmap_sid_to_uid: sid = [%s], domain = '%s'\n",
 155                   sid_string_dbg(sid), dom_name));
 156
 157         if (winbindd_use_idmap_cache()
 158             && idmap_cache_find_sid2uid(sid, uid, &expired)) {
 159                 DEBUG(10, ("idmap_cache_find_sid2uid found %d%s\n",
 160                            (int)(*uid), expired ? " (expired)": ""));
 161                 if (expired && idmap_is_online()) {
 162                         DEBUG(10, ("revalidating expired entry\n"));
 163                         goto backend;
 164                 }
 165                 if ((*uid) == -1) {
 166                         DEBUG(10, ("Returning negative cache entry\n"));
 167                         return NT_STATUS_NONE_MAPPED;
 168                 }
 169                 DEBUG(10, ("Returning positive cache entry\n"));
 170                 return NT_STATUS_OK;
 171         }
 172
 173 backend:
 174         map.sid = sid;
 175         map.xid.type = ID_TYPE_UID;
 176
 177         ret = idmap_backends_sid_to_unixid(dom_name, &map);
 178
 179         if (NT_STATUS_IS_OK(ret) && (map.status == ID_MAPPED)) {
 180                 if (map.xid.type != ID_TYPE_UID) {
 181                         DEBUG(10, ("sid [%s] not mapped to a uid "
 182                                    "[%u,%u,%u]\n",
 183                                    sid_string_dbg(sid),
 184                                    map.status,
 185                                    map.xid.type,
 186                                    map.xid.id));
 187                         if (winbindd_use_idmap_cache()) {
 188                                 idmap_cache_set_sid2uid(sid, -1);
 189                         }
 190                         return NT_STATUS_NONE_MAPPED;
 191                 }
 192                 goto done;
 193         }
 194
 195         if (dom_name[0] != '\0') {
 196                 /*
 197                  * We had the task to go to a specific domain which
 198                  * could not answer our request. Fail.
 199                  */
 200                 if (winbindd_use_idmap_cache()) {
 201                         idmap_cache_set_sid2uid(sid, -1);
 202                 }
 203                 return NT_STATUS_NONE_MAPPED;
 204         }
 205
 206         ret = idmap_new_mapping(sid, ID_TYPE_UID, &map.xid);
 207
 208         if (!NT_STATUS_IS_OK(ret)) {
 209                 DEBUG(10, ("idmap_new_mapping failed: %s\n",
 210                            nt_errstr(ret)));
 211                 if (winbindd_use_idmap_cache()) {
 212                         idmap_cache_set_sid2uid(sid, -1);
 213                 }
 214                 return ret;
 215         }
 216
 217 done:
 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, 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         map.sid = sid;
 257         map.xid.type = ID_TYPE_GID;
 258
 259         ret = idmap_backends_sid_to_unixid(domname, &map);
 260         if (NT_STATUS_IS_OK(ret) && (map.status == ID_MAPPED)) {
 261                 if (map.xid.type != ID_TYPE_GID) {
 262                         DEBUG(10, ("sid [%s] not mapped to a gid "
 263                                    "[%u,%u,%u]\n",
 264                                    sid_string_dbg(sid),
 265                                    map.status,
 266                                    map.xid.type,
 267                                    map.xid.id));
 268                         if (winbindd_use_idmap_cache()) {
 269                                 idmap_cache_set_sid2gid(sid, -1);
 270                         }
 271                         return NT_STATUS_NONE_MAPPED;
 272                 }
 273                 goto done;
 274         }
 275
 276         if (domname[0] != '\0') {
 277                 /*
 278                  * We had the task to go to a specific domain which
 279                  * could not answer our request. Fail.
 280                  */
 281                 if (winbindd_use_idmap_cache()) {
 282                         idmap_cache_set_sid2uid(sid, -1);
 283                 }
 284                 return NT_STATUS_NONE_MAPPED;
 285         }
 286
 287         ret = idmap_new_mapping(sid, ID_TYPE_GID, &map.xid);
 288
 289         if (!NT_STATUS_IS_OK(ret)) {
 290                 DEBUG(10, ("idmap_new_mapping failed: %s\n",
 291                            nt_errstr(ret)));
 292                 if (winbindd_use_idmap_cache()) {
 293                         idmap_cache_set_sid2gid(sid, -1);
 294                 }
 295                 return ret;
 296         }
 297
 298 done:
 299         *gid = map.xid.id;
 300         if (winbindd_use_idmap_cache()) {
 301                 idmap_cache_set_sid2gid(sid, *gid);
 302         }
 303         return NT_STATUS_OK;
 304 }