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/*
Unix SMB/CIFS implementation.
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"
/* idmap version determines auto-conversion */
#define IDMAP_VERSION 2
/* Globals */
static TDB_CONTEXT *idmap_tdb;
/* Allocate either a user or group id from the pool */
static BOOL allocate_id(uid_t *id, BOOL isgroup)
{
int hwm;
/* Get current high water mark */
if ((hwm = tdb_fetch_int32(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_int32(idmap_tdb, isgroup ? HWM_GROUP : HWM_USER, hwm);
return True;
}
/* Get an id from a rid */
static BOOL get_id_from_sid(DOM_SID *sid, uid_t *id, BOOL isgroup)
{
TDB_DATA data, key;
fstring keystr;
BOOL result = False;
/* Check if sid is present in database */
sid_to_string(keystr, sid);
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;
}
SAFE_FREE(data.dptr);
} else {
/* Allocate a new id for this sid */
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 sid */
BOOL winbindd_idmap_get_uid_from_sid(DOM_SID *sid, uid_t *uid)
{
return get_id_from_sid(sid, uid, False);
}
/* Get a gid from a group sid */
BOOL winbindd_idmap_get_gid_from_sid(DOM_SID *sid, gid_t *gid)
{
return get_id_from_sid(sid, gid, True);
}
/* Get a uid from a user rid */
BOOL winbindd_idmap_get_uid_from_rid(const char *dom_name, uint32 rid, uid_t *uid)
{
struct winbindd_domain *domain;
DOM_SID sid;
if (!(domain = find_domain_from_name(dom_name))) {
return False;
}
sid_copy(&sid, &domain->sid);
sid_append_rid(&sid, rid);
return get_id_from_sid(&sid, uid, False);
}
/* Get a gid from a group rid */
BOOL winbindd_idmap_get_gid_from_rid(const char *dom_name, uint32 rid, gid_t *gid)
{
struct winbindd_domain *domain;
DOM_SID sid;
if (!(domain = find_domain_from_name(dom_name))) {
return False;
}
sid_copy(&sid, &domain->sid);
sid_append_rid(&sid, rid);
return get_id_from_sid(&sid, gid, True);
}
BOOL get_sid_from_id(int id, DOM_SID *sid, 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) {
result = string_to_sid(sid, data.dptr);
SAFE_FREE(data.dptr);
}
return result;
}
/* Get a sid from a uid */
BOOL winbindd_idmap_get_sid_from_uid(uid_t uid, DOM_SID *sid)
{
return get_sid_from_id((int)uid, sid, False);
}
/* Get a sid from a gid */
BOOL winbindd_idmap_get_sid_from_gid(gid_t gid, DOM_SID *sid)
{
return get_sid_from_id((int)gid, sid, True);
}
/* Get a user rid from a uid */
BOOL winbindd_idmap_get_rid_from_uid(uid_t uid, uint32 *user_rid,
struct winbindd_domain **domain)
{
DOM_SID sid;
if (!get_sid_from_id((int)uid, &sid, False)) {
return False;
}
*domain = find_domain_from_sid(&sid);
if (! *domain) return False;
sid_split_rid(&sid, user_rid);
return True;
}
/* Get a group rid from a gid */
BOOL winbindd_idmap_get_rid_from_gid(gid_t gid, uint32 *group_rid,
struct winbindd_domain **domain)
{
DOM_SID sid;
if (!get_sid_from_id((int)gid, &sid, True)) {
return False;
}
*domain = find_domain_from_sid(&sid);
if (! *domain) return False;
sid_split_rid(&sid, group_rid);
return True;
}
/* convert one record to the new format */
static int convert_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA data, void *ignored)
{
struct winbindd_domain *domain;
char *p;
DOM_SID sid;
uint32 rid;
fstring keystr;
fstring dom_name;
TDB_DATA key2;
p = strchr(key.dptr, '/');
if (!p)
return 0;
*p = 0;
fstrcpy(dom_name, key.dptr);
*p++ = '/';
domain = find_domain_from_name(dom_name);
if (!domain) {
/* We must delete the old record. */
DEBUG(0,("winbindd: convert_fn : Unable to find domain %s\n", dom_name ));
DEBUG(0,("winbindd: convert_fn : deleting record %s\n", key.dptr ));
tdb_delete(idmap_tdb, key);
return 0;
}
rid = atoi(p);
sid_copy(&sid, &domain->sid);
sid_append_rid(&sid, rid);
sid_to_string(keystr, &sid);
key2.dptr = keystr;
key2.dsize = strlen(keystr) + 1;
if (tdb_store(idmap_tdb, key2, data, TDB_INSERT) != 0) {
/* not good! */
DEBUG(0,("winbindd: convert_fn : Unable to update record %s\n", key2.dptr ));
DEBUG(0,("winbindd: convert_fn : conversion failed - idmap corrupt ?\n"));
return -1;
}
if (tdb_store(idmap_tdb, data, key2, TDB_REPLACE) != 0) {
/* not good! */
DEBUG(0,("winbindd: convert_fn : Unable to update record %s\n", data.dptr ));
DEBUG(0,("winbindd: convert_fn : conversion failed - idmap corrupt ?\n"));
return -1;
}
tdb_delete(idmap_tdb, key);
return 0;
}
#if 0
/*****************************************************************************
Make a backup copy of the old idmap just to be safe.... JRA.
*****************************************************************************/
static BOOL backup_old_idmap(const char *idmap_name)
{
pstring new_name;
int outfd = -1;
SMB_OFF_T size;
struct stat st;
pstrcpy(new_name, idmap_name);
pstrcat(new_name, ".bak");
DEBUG(10,("backup_old_idmap: backing up %s to %s before upgrade.\n",
idmap_name, new_name ));
if (tdb_lockall(idmap_tdb) == -1) {
DEBUG(10,("backup_old_idmap: failed to lock %s. Error %s\n",
idmap_name, tdb_errorstr(idmap_tdb) ));
return False;
}
if ((outfd = open(new_name, O_CREAT|O_EXCL|O_RDWR, 0600)) == -1) {
DEBUG(10,("backup_old_idmap: failed to open %s. Error %s\n",
new_name, strerror(errno) ));
goto fail;
}
if (fstat(idmap_tdb->fd, &st) == -1) {
DEBUG(10,("backup_old_idmap: failed to fstat %s. Error %s\n",
idmap_name, strerror(errno) ));
goto fail;
}
size = (SMB_OFF_T)st.st_size;
if (transfer_file(idmap_tdb->fd, outfd, size) != size ) {
DEBUG(10,("backup_old_idmap: failed to copy %s. Error %s\n",
idmap_name, strerror(errno) ));
goto fail;
}
if (close(outfd) == -1) {
DEBUG(10,("backup_old_idmap: failed to close %s. Error %s\n",
idmap_name, strerror(errno) ));
outfd = -1;
goto fail;
}
tdb_unlockall(idmap_tdb);
return True;
fail:
if (outfd != -1)
close(outfd);
tdb_unlockall(idmap_tdb);
return False;
}
#endif
/*****************************************************************************
Convert the idmap database from an older version.
*****************************************************************************/
static BOOL idmap_convert(const char *idmap_name)
{
BOOL bytereversed = False;
int32 vers = tdb_fetch_int32(idmap_tdb, "IDMAP_VERSION");
if (vers == IDMAP_VERSION)
return True;
#if 0
/* Make a backup copy before doing anything else.... */
if (!backup_old_idmap(idmap_name))
return False;
#endif
bytereversed = (IREV(vers) == IDMAP_VERSION) ? True : False;
if ((vers == -1) || bytereversed) {
/* Arrggghh ! Bytereversed or missing - make order independent ! */
int32 wm;
wm = tdb_fetch_int32(idmap_tdb, HWM_USER);
if (wm != -1 && bytereversed) {
/* A record existed and it was from a big endian machine. */
wm = IREV(wm);
} else if (wm == -1)
wm = server_state.uid_low;
if (tdb_store_int32(idmap_tdb, HWM_USER, wm) == -1) {
DEBUG(0, ("idmap_convert: Unable to byteswap user hwm in idmap database\n"));
return False;
}
wm = tdb_fetch_int32(idmap_tdb, HWM_GROUP);
if (wm != -1 && bytereversed) {
/* A record existed and it was from a big endian machine. */
wm = IREV(wm);
} else if (wm == -1)
wm = server_state.gid_low;
if (tdb_store_int32(idmap_tdb, HWM_GROUP, wm) == -1) {
DEBUG(0, ("idmap_convert: Unable to byteswap group hwm in idmap database\n"));
return False;
}
}
/* the old format stored as DOMAIN/rid - now we store the SID direct */
tdb_traverse(idmap_tdb, convert_fn, NULL);
if (tdb_store_int32(idmap_tdb, "IDMAP_VERSION", IDMAP_VERSION) == -1) {
DEBUG(0, ("idmap_convert: Unable to byteswap group hwm in idmap database\n"));
return False;
}
return True;
}
/*****************************************************************************
Initialise idmap database.
*****************************************************************************/
BOOL winbindd_idmap_init(void)
{
/* Open tdb cache */
if (!(idmap_tdb = tdb_open_log(lock_path("winbindd_idmap.tdb"), 0,
TDB_DEFAULT, O_RDWR | O_CREAT, 0600))) {
DEBUG(0, ("winbindd_idmap_init: Unable to open idmap database\n"));
return False;
}
/* possibly convert from an earlier version */
if (!idmap_convert(lock_path("winbindd_idmap.tdb"))) {
DEBUG(0, ("winbindd_idmap_init: Unable to open idmap database\n"));
return False;
}
/* Create high water marks for group and user id */
if (tdb_fetch_int32(idmap_tdb, HWM_USER) == -1) {
if (tdb_store_int32(idmap_tdb, HWM_USER, server_state.uid_low) == -1) {
DEBUG(0, ("winbindd_idmap_init: Unable to initialise user hwm in idmap database\n"));
return False;
}
}
if (tdb_fetch_int32(idmap_tdb, HWM_GROUP) == -1) {
if (tdb_store_int32(idmap_tdb, HWM_GROUP, server_state.gid_low) == -1) {
DEBUG(0, ("winbindd_idmap_init: Unable to initialise group hwm in idmap database\n"));
return False;
}
}
return True;
}
BOOL winbindd_idmap_close(void)
{
if (idmap_tdb)
return (tdb_close(idmap_tdb) == 0);
return True;
}
/* Dump status information to log file. Display different stuff based on
the debug level:
Debug Level Information Displayed
=================================================================
0 Percentage of [ug]id range allocated
0 High water marks (next allocated ids)
*/
#define DUMP_INFO 0
void winbindd_idmap_status(void)
{
int user_hwm, group_hwm;
DEBUG(0, ("winbindd idmap status:\n"));
/* Get current high water marks */
if ((user_hwm = tdb_fetch_int32(idmap_tdb, HWM_USER)) == -1) {
DEBUG(DUMP_INFO, ("\tCould not get userid high water mark!\n"));
}
if ((group_hwm = tdb_fetch_int32(idmap_tdb, HWM_GROUP)) == -1) {
DEBUG(DUMP_INFO, ("\tCould not get groupid high water mark!\n"));
}
/* Display next ids to allocate */
if (user_hwm != -1) {
DEBUG(DUMP_INFO, ("\tNext userid to allocate is %d\n", user_hwm));
}
if (group_hwm != -1) {
DEBUG(DUMP_INFO, ("\tNext groupid to allocate is %d\n", group_hwm));
}
/* Display percentage of id range already allocated. */
if (user_hwm != -1) {
int num_users = user_hwm - server_state.uid_low;
int total_users = server_state.uid_high - server_state.uid_low;
DEBUG(DUMP_INFO, ("\tUser id range is %d%% full (%d of %d)\n",
num_users * 100 / total_users, num_users,
total_users));
}
if (group_hwm != -1) {
int num_groups = group_hwm - server_state.gid_low;
int total_groups = server_state.gid_high - server_state.gid_low;
DEBUG(DUMP_INFO, ("\tGroup id range is %d%% full (%d of %d)\n",
num_groups * 100 / total_groups, num_groups,
total_groups));
}
/* Display complete mapping of users and groups to rids */
}
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