source/nsswitch/winbindd_idmap.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 2.0
   4
   5    Winbind daemon - user related function
   6
   7    Copyright (C) Tim Potter 2000
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "winbindd.h"
  25
  26 /* High water mark keys */
  27
  28 #define HWM_GROUP  "GROUP HWM"
  29 #define HWM_USER   "USER HWM"
  30
  31 /* Globals */
  32
  33 static TDB_CONTEXT *idmap_tdb;
  34
  35 /* Allocate either a user or group id from the pool */
  36
  37 static BOOL allocate_id(uid_t *id, BOOL isgroup)
  38 {
  39     int hwm;
  40
  41     /* Get current high water mark */
  42
  43     if ((hwm = tdb_fetch_int(idmap_tdb,
  44                              isgroup ? HWM_GROUP : HWM_USER)) == -1) {
  45         return False;
  46     }
  47
  48     /* Return next available uid in list */
  49
  50     if ((isgroup && (hwm > server_state.gid_high)) ||
  51         (!isgroup && (hwm > server_state.uid_high))) {
  52         DEBUG(0, ("winbind %sid range full!\n", isgroup ? "g" : "u"));
  53         return False;
  54     }
  55
  56     if (id) {
  57         *id = hwm;
  58     }
  59
  60     hwm++;
  61
  62     /* Store new high water mark */
  63
  64     tdb_store_int(idmap_tdb, isgroup ? HWM_GROUP : HWM_USER, hwm);
  65
  66     return True;
  67 }
  68
  69 /* Get an id from a rid */
  70
  71 static BOOL get_id_from_rid(char *domain_name, uint32 rid, uid_t *id,
  72                             BOOL isgroup)
  73 {
  74     TDB_DATA data, key;
  75     fstring keystr;
  76     BOOL result = False;
  77
  78     /* Check if rid is present in database */
  79
  80     slprintf(keystr, sizeof(keystr), "%s/%d", domain_name, rid);
  81
  82     key.dptr = keystr;
  83     key.dsize = strlen(keystr) + 1;
  84
  85     data = tdb_fetch(idmap_tdb, key);
  86
  87     if (data.dptr) {
  88         fstring scanstr;
  89         int the_id;
  90
  91         /* Parse and return existing uid */
  92
  93         fstrcpy(scanstr, isgroup ? "GID" : "UID");
  94         fstrcat(scanstr, " %d");
  95
  96         if (sscanf(data.dptr, scanstr, &the_id) == 1) {
  97
  98             /* Store uid */
  99
 100             if (id) {
 101                 *id = the_id;
 102             }
 103
 104             result = True;
 105         }
 106
 107         SAFE_FREE(data.dptr);
 108
 109     } else {
 110
 111         /* Allocate a new id for this rid */
 112
 113         if (id && allocate_id(id, isgroup)) {
 114             fstring keystr2;
 115
 116             /* Store new id */
 117
 118             slprintf(keystr2, sizeof(keystr2), "%s %d", isgroup ? "GID" :
 119                      "UID", *id);
 120
 121             data.dptr = keystr2;
 122             data.dsize = strlen(keystr2) + 1;
 123
 124             tdb_store(idmap_tdb, key, data, TDB_REPLACE);
 125             tdb_store(idmap_tdb, data, key, TDB_REPLACE);
 126
 127             result = True;
 128         }
 129     }
 130
 131     return result;
 132 }
 133
 134 /* Get a uid from a user rid */
 135
 136 BOOL winbindd_idmap_get_uid_from_rid(char *domain_name, uint32 user_rid,
 137                                      uid_t *uid)
 138 {
 139     return get_id_from_rid(domain_name, user_rid, uid, False);
 140 }
 141
 142 /* Get a gid from a group rid */
 143
 144 BOOL winbindd_idmap_get_gid_from_rid(char *domain_name, uint32 group_rid,
 145                                      gid_t *gid)
 146 {
 147     return get_id_from_rid(domain_name, group_rid, gid, True);
 148 }
 149
 150 BOOL get_rid_from_id(int id, uint32 *rid, struct winbindd_domain **domain,
 151                      BOOL isgroup)
 152 {
 153     TDB_DATA key, data;
 154     fstring keystr;
 155     BOOL result = False;
 156
 157     slprintf(keystr, sizeof(keystr), "%s %d", isgroup ? "GID" : "UID", id);
 158
 159     key.dptr = keystr;
 160     key.dsize = strlen(keystr) + 1;
 161
 162     data = tdb_fetch(idmap_tdb, key);
 163
 164     if (data.dptr) {
 165         char *p = data.dptr;
 166         fstring domain_name;
 167         uint32 the_rid;
 168
 169         if (next_token(&p, domain_name, "/", sizeof(fstring))) {
 170
 171             the_rid = atoi(p);
 172
 173             if (rid) {
 174                 *rid = the_rid;
 175             }
 176
 177             if (domain) {
 178                 *domain = find_domain_from_name(domain_name);
 179                 if (*domain == NULL) {
 180                         DEBUG(1, ("unknown domain %s for rid %d\n",
 181                                   domain_name, the_rid));
 182                         result = False;
 183                         goto done;
 184                 }
 185             }
 186
 187             result = True;
 188         }
 189     done:
 190         SAFE_FREE(data.dptr);
 191     }
 192
 193     return result;
 194 }
 195
 196 /* Get a user rid from a uid */
 197
 198 BOOL winbindd_idmap_get_rid_from_uid(uid_t uid, uint32 *user_rid,
 199                                      struct winbindd_domain **domain)
 200 {
 201     return get_rid_from_id((int)uid, user_rid, domain, False);
 202 }
 203
 204 /* Get a group rid from a gid */
 205
 206 BOOL winbindd_idmap_get_rid_from_gid(gid_t gid, uint32 *group_rid,
 207                                      struct winbindd_domain **domain)
 208 {
 209     return get_rid_from_id((int)gid, group_rid, domain, True);
 210 }
 211
 212 /* Initialise idmap database */
 213
 214 BOOL winbindd_idmap_init(void)
 215 {
 216     /* Open tdb cache */
 217
 218     if (!(idmap_tdb = tdb_open_log(lock_path("winbindd_idmap.tdb"), 0,
 219                                TDB_NOLOCK, O_RDWR | O_CREAT, 0600))) {
 220         DEBUG(0, ("Unable to open idmap database\n"));
 221         return False;
 222     }
 223
 224      /* Create high water marks for group and user id */
 225
 226     if (tdb_fetch_int(idmap_tdb, HWM_USER) == -1) {
 227         if (tdb_store_int(idmap_tdb, HWM_USER, server_state.uid_low) == -1) {
 228             DEBUG(0, ("Unable to initialise user hwm in idmap database\n"));
 229             return False;
 230         }
 231     }
 232
 233     if (tdb_fetch_int(idmap_tdb, HWM_GROUP) == -1) {
 234         if (tdb_store_int(idmap_tdb, HWM_GROUP, server_state.gid_low) == -1) {
 235             DEBUG(0, ("Unable to initialise group hwm in idmap database\n"));
 236             return False;
 237         }
 238     }
 239
 240     return True;
 241 }
 242
 243 BOOL winbindd_idmap_close(void)
 244 {
 245         if (idmap_tdb)
 246                 return (tdb_close(idmap_tdb) == 0);
 247         return True;
 248 }
 249
 250 /* Dump status information to log file.  Display different stuff based on
 251    the debug level:
 252
 253    Debug Level        Information Displayed
 254    =================================================================
 255    0                  Percentage of [ug]id range allocated
 256    0                  High water marks (next allocated ids)
 257 */
 258
 259 #define DUMP_INFO 0
 260
 261 void winbindd_idmap_status(void)
 262 {
 263     int user_hwm, group_hwm;
 264
 265     DEBUG(0, ("winbindd idmap status:\n"));
 266
 267     /* Get current high water marks */
 268
 269     if ((user_hwm = tdb_fetch_int(idmap_tdb, HWM_USER)) == -1) {
 270         DEBUG(DUMP_INFO, ("\tCould not get userid high water mark!\n"));
 271     }
 272
 273     if ((group_hwm = tdb_fetch_int(idmap_tdb, HWM_GROUP)) == -1) {
 274         DEBUG(DUMP_INFO, ("\tCould not get groupid high water mark!\n"));
 275     }
 276
 277     /* Display next ids to allocate */
 278
 279     if (user_hwm != -1) {
 280         DEBUG(DUMP_INFO, ("\tNext userid to allocate is %d\n", user_hwm));
 281     }
 282
 283     if (group_hwm != -1) {
 284         DEBUG(DUMP_INFO, ("\tNext groupid to allocate is %d\n", group_hwm));
 285     }
 286
 287     /* Display percentage of id range already allocated. */
 288
 289     if (user_hwm != -1) {
 290         int num_users = user_hwm - server_state.uid_low;
 291         int total_users = server_state.uid_high - server_state.uid_low;
 292
 293         DEBUG(DUMP_INFO, ("\tUser id range is %d%% full (%d of %d)\n",
 294                           num_users * 100 / total_users, num_users,
 295                           total_users));
 296     }
 297
 298     if (group_hwm != -1) {
 299         int num_groups = group_hwm - server_state.gid_low;
 300         int total_groups = server_state.gid_high - server_state.gid_low;
 301
 302         DEBUG(DUMP_INFO, ("\tGroup id range is %d%% full (%d of %d)\n",
 303                           num_groups * 100 / total_groups, num_groups,
 304                           total_groups));
 305     }
 306
 307     /* Display complete mapping of users and groups to rids */
 308 }