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/*
Unix SMB/Netbios implementation.
Version 2.0
Winbind daemon - user related function
Copyright (C) Tim Potter 2000
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "winbindd.h"
/* High water mark keys */
#define HWM_GROUP "GROUP HWM"
#define HWM_USER "USER HWM"
/* Globals */
static TDB_CONTEXT *idmap_tdb;
/* Allocate either a user or group id from the pool */
static BOOL allocate_id(int *id, BOOL isgroup)
{
int hwm;
/* Get current high water mark */
if ((hwm = tdb_fetch_int(idmap_tdb,
isgroup ? HWM_GROUP : HWM_USER)) == -1) {
return False;
}
/* Return next available uid in list */
if ((isgroup && (hwm > server_state.gid_high)) ||
(!isgroup && (hwm > server_state.uid_high))) {
DEBUG(0, ("winbind %sid range full!\n", isgroup ? "g" : "u"));
return False;
}
if (id) {
*id = hwm;
}
hwm++;
/* Store new high water mark */
tdb_store_int(idmap_tdb, isgroup ? HWM_GROUP : HWM_USER, hwm);
return True;
}
/* Get an id from a rid */
static BOOL get_id_from_rid(char *domain_name, uint32 rid, int *id,
BOOL isgroup)
{
TDB_DATA data, key;
fstring keystr;
BOOL result;
/* Check if rid is present in database */
slprintf(keystr, sizeof(keystr), "%s/%d", domain_name, rid);
dos_to_unix(keystr, True); /* Convert key to unix-codepage */
key.dptr = keystr;
key.dsize = strlen(keystr) + 1;
data = tdb_fetch(idmap_tdb, key);
if (data.dptr) {
fstring scanstr;
int the_id;
/* Parse and return existing uid */
fstrcpy(scanstr, isgroup ? "GID" : "UID");
fstrcat(scanstr, " %d");
if (sscanf(data.dptr, scanstr, &the_id) == 1) {
/* Store uid */
if (id) {
*id = the_id;
}
result = True;
}
free(data.dptr);
} else {
/* Allocate a new id for this rid */
if (id && allocate_id(id, isgroup)) {
fstring keystr2;
/* Store new id */
slprintf(keystr2, sizeof(keystr2), "%s %d", isgroup ? "GID" :
"UID", *id);
data.dptr = keystr2;
data.dsize = strlen(keystr2) + 1;
tdb_store(idmap_tdb, key, data, TDB_REPLACE);
tdb_store(idmap_tdb, data, key, TDB_REPLACE);
result = True;
}
}
return result;
}
/* Get a uid from a user rid */
BOOL winbindd_idmap_get_uid_from_rid(char *domain_name, uint32 user_rid,
uid_t *uid)
{
return get_id_from_rid(domain_name, user_rid, uid, False);
}
/* Get a gid from a group rid */
BOOL winbindd_idmap_get_gid_from_rid(char *domain_name, uint32 group_rid,
gid_t *gid)
{
return get_id_from_rid(domain_name, group_rid, gid, True);
}
BOOL get_rid_from_id(int id, uint32 *rid, struct winbindd_domain **domain,
BOOL isgroup)
{
TDB_DATA key, data;
fstring keystr;
BOOL result = False;
slprintf(keystr, sizeof(keystr), "%s %d", isgroup ? "GID" : "UID", id);
key.dptr = keystr;
key.dsize = strlen(keystr) + 1;
data = tdb_fetch(idmap_tdb, key);
if (data.dptr) {
char *p = data.dptr;
fstring domain_name;
uint32 the_rid;
if (next_token(&p, domain_name, "/", sizeof(fstring))) {
the_rid = atoi(p);
if (rid) {
*rid = the_rid;
}
if (domain) {
*domain = find_domain_from_name(domain_name);
}
result = True;
}
free(data.dptr);
}
return result;
}
/* Get a user rid from a uid */
BOOL winbindd_idmap_get_rid_from_uid(uid_t uid, uint32 *user_rid,
struct winbindd_domain **domain)
{
return get_rid_from_id((int)uid, user_rid, domain, False);
}
/* Get a group rid from a gid */
BOOL winbindd_idmap_get_rid_from_gid(gid_t gid, uint32 *group_rid,
struct winbindd_domain **domain)
{
return get_rid_from_id((int)gid, group_rid, domain, True);
}
/* Initialise idmap database */
BOOL winbindd_idmap_init(void)
{
/* Open tdb cache */
if (!(idmap_tdb = tdb_open(lock_path("winbindd_idmap.tdb"), 0,
TDB_NOLOCK | TDB_NOMMAP,
O_RDWR | O_CREAT, 0600))) {
DEBUG(0, ("Unable to open idmap database\n"));
return False;
}
/* Create high water marks for group and user id */
if (tdb_fetch_int(idmap_tdb, HWM_USER) == -1) {
if (tdb_store_int(idmap_tdb, HWM_USER, server_state.uid_low) == -1) {
DEBUG(0, ("Unable to initialise user hwm in idmap database\n"));
return False;
}
}
if (tdb_fetch_int(idmap_tdb, HWM_GROUP) == -1) {
if (tdb_store_int(idmap_tdb, HWM_GROUP, server_state.gid_low) == -1) {
DEBUG(0, ("Unable to initialise group hwm in idmap database\n"));
return False;
}
}
return True;
}
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