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 #include "idmap.h"
  24 #include "idmap_cache.h"
  25
  26 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_IDMAP
  28
  29 /*****************************************************************
  30  Returns the SID mapped to the given UID.
  31  If mapping is not possible returns an error.
  32 *****************************************************************/
  33
  34 NTSTATUS idmap_uid_to_sid(const char *domname, struct dom_sid *sid, uid_t uid)
  35 {
  36         NTSTATUS ret;
  37         struct id_map map;
  38         bool expired;
  39
  40         DEBUG(10,("idmap_uid_to_sid: uid = [%lu], domain = '%s'\n",
  41                   (unsigned long)uid, domname?domname:"NULL"));
  42
  43         if (winbindd_use_idmap_cache()
  44             && idmap_cache_find_uid2sid(uid, sid, &expired)) {
  45                 DEBUG(10, ("idmap_cache_find_uid2sid found %u%s\n",
  46                         (unsigned int)uid,
  47                            expired ? " (expired)": ""));
  48                 if (expired && idmap_is_online()) {
  49                         DEBUG(10, ("revalidating expired entry\n"));
  50                         goto backend;
  51                 }
  52                 if (is_null_sid(sid)) {
  53                         DEBUG(10, ("Returning negative cache entry\n"));
  54                         return NT_STATUS_NONE_MAPPED;
  55                 }
  56                 DEBUG(10, ("Returning positive cache entry\n"));
  57                 return NT_STATUS_OK;
  58         }
  59
  60 backend:
  61         map.sid = sid;
  62         map.xid.type = ID_TYPE_UID;
  63         map.xid.id = uid;
  64
  65         ret = idmap_backends_unixid_to_sid(domname, &map);
  66         if ( ! NT_STATUS_IS_OK(ret)) {
  67                 DEBUG(10, ("error mapping uid [%lu]\n", (unsigned long)uid));
  68                 return ret;
  69         }
  70
  71         if (map.status != ID_MAPPED) {
  72                 if (winbindd_use_idmap_cache()) {
  73                         struct dom_sid null_sid;
  74                         ZERO_STRUCT(null_sid);
  75                         idmap_cache_set_sid2uid(&null_sid, uid);
  76                 }
  77                 DEBUG(10, ("uid [%lu] not mapped\n", (unsigned long)uid));
  78                 return NT_STATUS_NONE_MAPPED;
  79         }
  80
  81         if (winbindd_use_idmap_cache()) {
  82                 idmap_cache_set_sid2uid(sid, uid);
  83         }
  84
  85         return NT_STATUS_OK;
  86 }
  87
  88 /*****************************************************************
  89  Returns SID mapped to the given GID.
  90  If mapping is not possible returns an error.
  91 *****************************************************************/
  92
  93 NTSTATUS idmap_gid_to_sid(const char *domname, struct dom_sid *sid, gid_t gid)
  94 {
  95         NTSTATUS ret;
  96         struct id_map map;
  97         bool expired;
  98
  99         DEBUG(10,("idmap_gid_to_sid: gid = [%lu], domain = '%s'\n",
 100                   (unsigned long)gid, domname?domname:"NULL"));
 101
 102         if (winbindd_use_idmap_cache()
 103             && idmap_cache_find_gid2sid(gid, sid, &expired)) {
 104                 DEBUG(10, ("idmap_cache_find_gid2sid found %u%s\n",
 105                         (unsigned int)gid,
 106                            expired ? " (expired)": ""));
 107                 if (expired && idmap_is_online()) {
 108                         DEBUG(10, ("revalidating expired entry\n"));
 109                         goto backend;
 110                 }
 111                 if (is_null_sid(sid)) {
 112                         DEBUG(10, ("Returning negative cache entry\n"));
 113                         return NT_STATUS_NONE_MAPPED;
 114                 }
 115                 DEBUG(10, ("Returning positive cache entry\n"));
 116                 return NT_STATUS_OK;
 117         }
 118
 119 backend:
 120         map.sid = sid;
 121         map.xid.type = ID_TYPE_GID;
 122         map.xid.id = gid;
 123
 124         ret = idmap_backends_unixid_to_sid(domname, &map);
 125         if ( ! NT_STATUS_IS_OK(ret)) {
 126                 DEBUG(10, ("error mapping gid [%lu]\n", (unsigned long)gid));
 127                 return ret;
 128         }
 129
 130         if (map.status != ID_MAPPED) {
 131                 if (winbindd_use_idmap_cache()) {
 132                         struct dom_sid null_sid;
 133                         ZERO_STRUCT(null_sid);
 134                         idmap_cache_set_sid2uid(&null_sid, gid);
 135                 }
 136                 DEBUG(10, ("gid [%lu] not mapped\n", (unsigned long)gid));
 137                 return NT_STATUS_NONE_MAPPED;
 138         }
 139
 140         if (winbindd_use_idmap_cache()) {
 141                 idmap_cache_set_sid2gid(sid, gid);
 142         }
 143
 144         return NT_STATUS_OK;
 145 }
 146
 147 /*****************************************************************
 148  Returns the UID mapped to the given SID.
 149  If mapping is not possible or SID maps to a GID returns an error.
 150 *****************************************************************/
 151
 152 NTSTATUS idmap_sid_to_uid(const char *dom_name, struct dom_sid *sid, uid_t *uid)
 153 {
 154         NTSTATUS ret;
 155         struct id_map map;
 156         bool expired;
 157
 158         DEBUG(10,("idmap_sid_to_uid: sid = [%s], domain = '%s'\n",
 159                   sid_string_dbg(sid), dom_name));
 160
 161         if (winbindd_use_idmap_cache()
 162             && idmap_cache_find_sid2uid(sid, uid, &expired)) {
 163                 DEBUG(10, ("idmap_cache_find_sid2uid found %d%s\n",
 164                            (int)(*uid), expired ? " (expired)": ""));
 165                 if (expired && idmap_is_online()) {
 166                         DEBUG(10, ("revalidating expired entry\n"));
 167                         goto backend;
 168                 }
 169                 if ((*uid) == -1) {
 170                         DEBUG(10, ("Returning negative cache entry\n"));
 171                         return NT_STATUS_NONE_MAPPED;
 172                 }
 173                 DEBUG(10, ("Returning positive cache entry\n"));
 174                 return NT_STATUS_OK;
 175         }
 176
 177 backend:
 178         map.sid = sid;
 179         map.xid.type = ID_TYPE_UID;
 180
 181         ret = idmap_backends_sid_to_unixid(dom_name, &map);
 182
 183         if (!NT_STATUS_IS_OK(ret)) {
 184                 DEBUG(10, ("idmap_backends_sid_to_unixid failed: %s\n",
 185                            nt_errstr(ret)));
 186                 if (winbindd_use_idmap_cache()) {
 187                         idmap_cache_set_sid2uid(sid, -1);
 188                 }
 189                 return ret;
 190         }
 191
 192         if (map.status != ID_MAPPED) {
 193                 DEBUG(10, ("sid [%s] is not mapped\n", sid_string_dbg(sid)));
 194                 if (winbindd_use_idmap_cache()) {
 195                         idmap_cache_set_sid2uid(sid, -1);
 196                 }
 197                 return NT_STATUS_NONE_MAPPED;
 198         }
 199
 200         if (map.xid.type != ID_TYPE_UID) {
 201                 DEBUG(10, ("sid [%s] not mapped to a uid "
 202                            "[%u,%u,%u]\n",
 203                            sid_string_dbg(sid),
 204                            map.status,
 205                            map.xid.type,
 206                            map.xid.id));
 207                 if (winbindd_use_idmap_cache()) {
 208                         idmap_cache_set_sid2uid(sid, -1);
 209                 }
 210                 return NT_STATUS_NONE_MAPPED;
 211         }
 212
 213         *uid = (uid_t)map.xid.id;
 214         if (winbindd_use_idmap_cache()) {
 215                 idmap_cache_set_sid2uid(sid, *uid);
 216         }
 217         return NT_STATUS_OK;
 218 }
 219
 220 /*****************************************************************
 221  Returns the GID mapped to the given SID.
 222  If mapping is not possible or SID maps to a UID returns an error.
 223 *****************************************************************/
 224
 225 NTSTATUS idmap_sid_to_gid(const char *domname, struct dom_sid *sid, gid_t *gid)
 226 {
 227         NTSTATUS ret;
 228         struct id_map map;
 229         bool expired;
 230
 231         DEBUG(10,("idmap_sid_to_gid: sid = [%s], domain = '%s'\n",
 232                   sid_string_dbg(sid), domname));
 233
 234         if (winbindd_use_idmap_cache()
 235             && idmap_cache_find_sid2gid(sid, gid, &expired)) {
 236                 DEBUG(10, ("idmap_cache_find_sid2gid found %d%s\n",
 237                            (int)(*gid), expired ? " (expired)": ""));
 238                 if (expired && idmap_is_online()) {
 239                         DEBUG(10, ("revalidating expired entry\n"));
 240                         goto backend;
 241                 }
 242                 if ((*gid) == -1) {
 243                         DEBUG(10, ("Returning negative cache entry\n"));
 244                         return NT_STATUS_NONE_MAPPED;
 245                 }
 246                 DEBUG(10, ("Returning positive cache entry\n"));
 247                 return NT_STATUS_OK;
 248         }
 249
 250 backend:
 251         map.sid = sid;
 252         map.xid.type = ID_TYPE_GID;
 253
 254         ret = idmap_backends_sid_to_unixid(domname, &map);
 255
 256         if (!NT_STATUS_IS_OK(ret)) {
 257                 DEBUG(10, ("idmap_backends_sid_to_unixid failed: %s\n",
 258                            nt_errstr(ret)));
 259                 if (winbindd_use_idmap_cache()) {
 260                         idmap_cache_set_sid2uid(sid, -1);
 261                 }
 262                 return ret;
 263         }
 264
 265         if (map.status != ID_MAPPED) {
 266                 DEBUG(10, ("sid [%s] is not mapped\n", sid_string_dbg(sid)));
 267                 if (winbindd_use_idmap_cache()) {
 268                         idmap_cache_set_sid2uid(sid, -1);
 269                 }
 270                 return NT_STATUS_NONE_MAPPED;
 271         }
 272
 273         if (map.xid.type != ID_TYPE_GID) {
 274                 DEBUG(10, ("sid [%s] not mapped to a gid "
 275                            "[%u,%u,%u]\n",
 276                            sid_string_dbg(sid),
 277                            map.status,
 278                            map.xid.type,
 279                            map.xid.id));
 280                 if (winbindd_use_idmap_cache()) {
 281                         idmap_cache_set_sid2gid(sid, -1);
 282                 }
 283                 return NT_STATUS_NONE_MAPPED;
 284         }
 285
 286         *gid = map.xid.id;
 287         if (winbindd_use_idmap_cache()) {
 288                 idmap_cache_set_sid2gid(sid, *gid);
 289         }
 290         return NT_STATUS_OK;
 291 }
 292
 293 /**
 294  * check whether a given unix id is inside the filter range of an idmap domain
 295  */
 296 bool idmap_unix_id_is_in_range(uint32_t id, struct idmap_domain *dom)
 297 {
 298         if (id == 0) {
 299                 /* 0 is not an allowed unix id for id mapping */
 300                 return false;
 301         }
 302
 303         if ((dom->low_id && (id < dom->low_id)) ||
 304             (dom->high_id && (id > dom->high_id)))
 305         {
 306                 return false;
 307         }
 308
 309         return true;
 310 }