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         ZERO_STRUCT(map);
  64         map.sid = sid;
  65         map.xid.type = ID_TYPE_UID;
  66         map.xid.id = uid;
  67
  68         ret = idmap_backends_unixid_to_sid(domname, &map);
  69         if ( ! NT_STATUS_IS_OK(ret)) {
  70                 DEBUG(10, ("error mapping uid [%lu]\n", (unsigned long)uid));
  71                 return ret;
  72         }
  73
  74         if (map.status != ID_MAPPED) {
  75                 if (winbindd_use_idmap_cache()) {
  76                         struct dom_sid null_sid;
  77                         struct unixid id;
  78                         id.type = ID_TYPE_UID;
  79                         id.id = uid;
  80                         ZERO_STRUCT(null_sid);
  81                         idmap_cache_set_sid2unixid(&null_sid, &id);
  82                 }
  83                 DEBUG(10, ("uid [%lu] not mapped\n", (unsigned long)uid));
  84                 return NT_STATUS_NONE_MAPPED;
  85         }
  86
  87         if (winbindd_use_idmap_cache()) {
  88                 idmap_cache_set_sid2unixid(sid, &map.xid);
  89         }
  90
  91         return NT_STATUS_OK;
  92 }
  93
  94 /*****************************************************************
  95  Returns SID mapped to the given GID.
  96  If mapping is not possible returns an error.
  97 *****************************************************************/
  98
  99 NTSTATUS idmap_gid_to_sid(const char *domname, struct dom_sid *sid, gid_t gid)
 100 {
 101         NTSTATUS ret;
 102         struct id_map map;
 103         bool expired;
 104
 105         DEBUG(10,("idmap_gid_to_sid: gid = [%lu], domain = '%s'\n",
 106                   (unsigned long)gid, domname?domname:"NULL"));
 107
 108         if (winbindd_use_idmap_cache()
 109             && idmap_cache_find_gid2sid(gid, sid, &expired)) {
 110                 DEBUG(10, ("idmap_cache_find_gid2sid found %u%s\n",
 111                         (unsigned int)gid,
 112                            expired ? " (expired)": ""));
 113                 if (expired && idmap_is_online()) {
 114                         DEBUG(10, ("revalidating expired entry\n"));
 115                         goto backend;
 116                 }
 117                 if (is_null_sid(sid)) {
 118                         DEBUG(10, ("Returning negative cache entry\n"));
 119                         return NT_STATUS_NONE_MAPPED;
 120                 }
 121                 DEBUG(10, ("Returning positive cache entry\n"));
 122                 return NT_STATUS_OK;
 123         }
 124
 125 backend:
 126         ZERO_STRUCT(map);
 127         map.sid = sid;
 128         map.xid.type = ID_TYPE_GID;
 129         map.xid.id = gid;
 130
 131         ret = idmap_backends_unixid_to_sid(domname, &map);
 132         if ( ! NT_STATUS_IS_OK(ret)) {
 133                 DEBUG(10, ("error mapping gid [%lu]\n", (unsigned long)gid));
 134                 return ret;
 135         }
 136
 137         if (map.status != ID_MAPPED) {
 138                 if (winbindd_use_idmap_cache()) {
 139                         struct dom_sid null_sid;
 140                         struct unixid id;
 141                         id.type = ID_TYPE_GID;
 142                         id.id = gid;
 143                         ZERO_STRUCT(null_sid);
 144                         idmap_cache_set_sid2unixid(&null_sid, &id);
 145                 }
 146                 DEBUG(10, ("gid [%lu] not mapped\n", (unsigned long)gid));
 147                 return NT_STATUS_NONE_MAPPED;
 148         }
 149
 150         if (winbindd_use_idmap_cache()) {
 151                 idmap_cache_set_sid2unixid(sid, &map.xid);
 152         }
 153
 154         return NT_STATUS_OK;
 155 }
 156
 157 /*****************************************************************
 158  Returns the UID mapped to the given SID.
 159  If mapping is not possible or SID maps to a GID returns an error.
 160 *****************************************************************/
 161
 162 NTSTATUS idmap_sid_to_uid(const char *dom_name, struct dom_sid *sid, uid_t *uid)
 163 {
 164         NTSTATUS ret;
 165         struct id_map map;
 166         bool expired;
 167
 168         DEBUG(10,("idmap_sid_to_uid: sid = [%s], domain = '%s'\n",
 169                   sid_string_dbg(sid), dom_name));
 170
 171         if (winbindd_use_idmap_cache()
 172             && idmap_cache_find_sid2uid(sid, uid, &expired)) {
 173                 DEBUG(10, ("idmap_cache_find_sid2uid found %d%s\n",
 174                            (int)(*uid), expired ? " (expired)": ""));
 175                 if (expired && idmap_is_online()) {
 176                         DEBUG(10, ("revalidating expired entry\n"));
 177                         goto backend;
 178                 }
 179                 if ((*uid) == -1) {
 180                         DEBUG(10, ("Returning negative cache entry\n"));
 181                         return NT_STATUS_NONE_MAPPED;
 182                 }
 183                 DEBUG(10, ("Returning positive cache entry\n"));
 184                 return NT_STATUS_OK;
 185         }
 186
 187 backend:
 188         ZERO_STRUCT(map);
 189         map.sid = sid;
 190         map.xid.type = ID_TYPE_UID;
 191
 192         ret = idmap_backends_sid_to_unixid(dom_name, &map);
 193
 194         if (!NT_STATUS_IS_OK(ret)) {
 195                 DEBUG(10, ("idmap_backends_sid_to_unixid failed: %s\n",
 196                            nt_errstr(ret)));
 197                 if (winbindd_use_idmap_cache()) {
 198                         idmap_cache_set_sid2uid(sid, -1);
 199                 }
 200                 return ret;
 201         }
 202
 203         if (map.status != ID_MAPPED) {
 204                 DEBUG(10, ("sid [%s] is not mapped\n", sid_string_dbg(sid)));
 205                 if (winbindd_use_idmap_cache()) {
 206                         idmap_cache_set_sid2uid(sid, -1);
 207                 }
 208                 return NT_STATUS_NONE_MAPPED;
 209         }
 210
 211         if (map.xid.type != ID_TYPE_UID) {
 212                 DEBUG(10, ("sid [%s] not mapped to a uid "
 213                            "[%u,%u,%u]\n",
 214                            sid_string_dbg(sid),
 215                            map.status,
 216                            map.xid.type,
 217                            map.xid.id));
 218                 if (winbindd_use_idmap_cache()) {
 219                         idmap_cache_set_sid2uid(sid, -1);
 220                 }
 221                 return NT_STATUS_NONE_MAPPED;
 222         }
 223
 224         *uid = (uid_t)map.xid.id;
 225         if (winbindd_use_idmap_cache()) {
 226                 idmap_cache_set_sid2unixid(sid, &map.xid);
 227         }
 228         return NT_STATUS_OK;
 229 }
 230
 231 /*****************************************************************
 232  Returns the GID mapped to the given SID.
 233  If mapping is not possible or SID maps to a UID returns an error.
 234 *****************************************************************/
 235
 236 NTSTATUS idmap_sid_to_gid(const char *domname, struct dom_sid *sid, gid_t *gid)
 237 {
 238         NTSTATUS ret;
 239         struct id_map map;
 240         bool expired;
 241
 242         DEBUG(10,("idmap_sid_to_gid: sid = [%s], domain = '%s'\n",
 243                   sid_string_dbg(sid), domname));
 244
 245         if (winbindd_use_idmap_cache()
 246             && idmap_cache_find_sid2gid(sid, gid, &expired)) {
 247                 DEBUG(10, ("idmap_cache_find_sid2gid found %d%s\n",
 248                            (int)(*gid), expired ? " (expired)": ""));
 249                 if (expired && idmap_is_online()) {
 250                         DEBUG(10, ("revalidating expired entry\n"));
 251                         goto backend;
 252                 }
 253                 if ((*gid) == -1) {
 254                         DEBUG(10, ("Returning negative cache entry\n"));
 255                         return NT_STATUS_NONE_MAPPED;
 256                 }
 257                 DEBUG(10, ("Returning positive cache entry\n"));
 258                 return NT_STATUS_OK;
 259         }
 260
 261 backend:
 262         ZERO_STRUCT(map);
 263         map.sid = sid;
 264         map.xid.type = ID_TYPE_GID;
 265
 266         ret = idmap_backends_sid_to_unixid(domname, &map);
 267
 268         if (!NT_STATUS_IS_OK(ret)) {
 269                 DEBUG(10, ("idmap_backends_sid_to_unixid failed: %s\n",
 270                            nt_errstr(ret)));
 271                 if (winbindd_use_idmap_cache()) {
 272                         idmap_cache_set_sid2gid(sid, -1);
 273                 }
 274                 return ret;
 275         }
 276
 277         if (map.status != ID_MAPPED) {
 278                 DEBUG(10, ("sid [%s] is not mapped\n", sid_string_dbg(sid)));
 279                 if (winbindd_use_idmap_cache()) {
 280                         idmap_cache_set_sid2gid(sid, -1);
 281                 }
 282                 return NT_STATUS_NONE_MAPPED;
 283         }
 284
 285         if (map.xid.type != ID_TYPE_GID) {
 286                 DEBUG(10, ("sid [%s] not mapped to a gid "
 287                            "[%u,%u,%u]\n",
 288                            sid_string_dbg(sid),
 289                            map.status,
 290                            map.xid.type,
 291                            map.xid.id));
 292                 if (winbindd_use_idmap_cache()) {
 293                         idmap_cache_set_sid2gid(sid, -1);
 294                 }
 295                 return NT_STATUS_NONE_MAPPED;
 296         }
 297
 298         *gid = map.xid.id;
 299         if (winbindd_use_idmap_cache()) {
 300                 idmap_cache_set_sid2unixid(sid, &map.xid);
 301         }
 302         return NT_STATUS_OK;
 303 }
 304
 305 /**
 306  * check whether a given unix id is inside the filter range of an idmap domain
 307  */
 308 bool idmap_unix_id_is_in_range(uint32_t id, struct idmap_domain *dom)
 309 {
 310         if (id == 0) {
 311                 /* 0 is not an allowed unix id for id mapping */
 312                 return false;
 313         }
 314
 315         if ((dom->low_id && (id < dom->low_id)) ||
 316             (dom->high_id && (id > dom->high_id)))
 317         {
 318                 return false;
 319         }
 320
 321         return true;
 322 }