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/*
Unix SMB/CIFS implementation.
Net_sam_logon info3 helpers
Copyright (C) Alexander Bokovoy 2002.
Copyright (C) Andrew Bartlett 2002.
Copyright (C) Gerald Carter 2003.
Copyright (C) Tim Potter 2003.
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#define NETSAMLOGON_TDB "netsamlogon_cache.tdb"
static TDB_CONTEXT *netsamlogon_tdb = NULL;
/***********************************************************************
open the tdb
***********************************************************************/
bool netsamlogon_cache_init(void)
{
if (!netsamlogon_tdb) {
netsamlogon_tdb = tdb_open_log(lock_path(NETSAMLOGON_TDB), 0,
TDB_DEFAULT, O_RDWR | O_CREAT, 0600);
}
return (netsamlogon_tdb != NULL);
}
/***********************************************************************
Shutdown samlogon_cache database
***********************************************************************/
bool netsamlogon_cache_shutdown(void)
{
if(netsamlogon_tdb)
return (tdb_close(netsamlogon_tdb) == 0);
return True;
}
/***********************************************************************
Clear cache getpwnam and getgroups entries from the winbindd cache
***********************************************************************/
void netsamlogon_clear_cached_user(TDB_CONTEXT *tdb, NET_USER_INFO_3 *user)
{
bool got_tdb = False;
DOM_SID sid;
fstring key_str, sid_string;
/* We may need to call this function from smbd which will not have
winbindd_cache.tdb open. Open the tdb if a NULL is passed. */
if (!tdb) {
tdb = tdb_open_log(lock_path("winbindd_cache.tdb"),
WINBINDD_CACHE_TDB_DEFAULT_HASH_SIZE,
TDB_DEFAULT, O_RDWR, 0600);
if (!tdb) {
DEBUG(5, ("netsamlogon_clear_cached_user: failed to open cache\n"));
return;
}
got_tdb = True;
}
sid_copy(&sid, &user->dom_sid.sid);
sid_append_rid(&sid, user->user_rid);
/* Clear U/SID cache entry */
fstr_sprintf(key_str, "U/%s", sid_to_string(sid_string, &sid));
DEBUG(10, ("netsamlogon_clear_cached_user: clearing %s\n", key_str));
tdb_delete(tdb, string_tdb_data(key_str));
/* Clear UG/SID cache entry */
fstr_sprintf(key_str, "UG/%s", sid_to_string(sid_string, &sid));
DEBUG(10, ("netsamlogon_clear_cached_user: clearing %s\n", key_str));
tdb_delete(tdb, string_tdb_data(key_str));
if (got_tdb)
tdb_close(tdb);
}
/***********************************************************************
Store a NET_USER_INFO_3 structure in a tdb for later user
username should be in UTF-8 format
***********************************************************************/
bool netsamlogon_cache_store( const char *username, NET_USER_INFO_3 *user )
{
TDB_DATA data;
fstring keystr, tmp;
prs_struct ps;
bool result = False;
DOM_SID user_sid;
time_t t = time(NULL);
TALLOC_CTX *mem_ctx;
if (!netsamlogon_cache_init()) {
DEBUG(0,("netsamlogon_cache_store: cannot open %s for write!\n", NETSAMLOGON_TDB));
return False;
}
sid_copy( &user_sid, &user->dom_sid.sid );
sid_append_rid( &user_sid, user->user_rid );
/* Prepare key as DOMAIN-SID/USER-RID string */
slprintf(keystr, sizeof(keystr), "%s", sid_to_string(tmp, &user_sid));
DEBUG(10,("netsamlogon_cache_store: SID [%s]\n", keystr));
/* only Samba fills in the username, not sure why NT doesn't */
/* so we fill it in since winbindd_getpwnam() makes use of it */
if ( !user->uni_user_name.buffer ) {
init_unistr2( &user->uni_user_name, username, UNI_STR_TERMINATE );
init_uni_hdr( &user->hdr_user_name, &user->uni_user_name );
}
/* Prepare data */
if ( !(mem_ctx = TALLOC_P( NULL, int )) ) {
DEBUG(0,("netsamlogon_cache_store: talloc() failed!\n"));
return False;
}
prs_init( &ps, RPC_MAX_PDU_FRAG_LEN, mem_ctx, MARSHALL);
{
uint32 ts = (uint32)t;
if ( !prs_uint32( "timestamp", &ps, 0, &ts ) )
return False;
}
if ( net_io_user_info3("", user, &ps, 0, 3, 0) )
{
data.dsize = prs_offset( &ps );
data.dptr = (uint8 *)prs_data_p( &ps );
if (tdb_store_bystring(netsamlogon_tdb, keystr, data, TDB_REPLACE) != -1)
result = True;
prs_mem_free( &ps );
}
TALLOC_FREE( mem_ctx );
return result;
}
/***********************************************************************
Retrieves a NET_USER_INFO_3 structure from a tdb. Caller must
free the user_info struct (malloc()'d memory)
***********************************************************************/
NET_USER_INFO_3* netsamlogon_cache_get( TALLOC_CTX *mem_ctx, const DOM_SID *user_sid)
{
NET_USER_INFO_3 *user = NULL;
TDB_DATA data;
prs_struct ps;
fstring keystr, tmp;
uint32 t;
if (!netsamlogon_cache_init()) {
DEBUG(0,("netsamlogon_cache_get: cannot open %s for write!\n", NETSAMLOGON_TDB));
return False;
}
/* Prepare key as DOMAIN-SID/USER-RID string */
slprintf(keystr, sizeof(keystr), "%s", sid_to_string(tmp, user_sid));
DEBUG(10,("netsamlogon_cache_get: SID [%s]\n", keystr));
data = tdb_fetch_bystring( netsamlogon_tdb, keystr );
if ( data.dptr ) {
user = TALLOC_ZERO_P(mem_ctx, NET_USER_INFO_3);
if (user == NULL) {
return NULL;
}
prs_init( &ps, 0, mem_ctx, UNMARSHALL );
prs_give_memory( &ps, (char *)data.dptr, data.dsize, True );
if ( !prs_uint32( "timestamp", &ps, 0, &t ) ) {
prs_mem_free( &ps );
TALLOC_FREE(user);
return False;
}
if ( !net_io_user_info3("", user, &ps, 0, 3, 0) ) {
TALLOC_FREE( user );
}
prs_mem_free( &ps );
#if 0 /* The netsamlogon cache needs to hang around. Something about
this feels wrong, but it is the only way we can get all of the
groups. The old universal groups cache didn't expire either.
--jerry */
{
time_t now = time(NULL);
uint32 time_diff;
/* is the entry expired? */
time_diff = now - t;
if ( (time_diff < 0 ) || (time_diff > lp_winbind_cache_time()) ) {
DEBUG(10,("netsamlogon_cache_get: cache entry expired \n"));
tdb_delete( netsamlogon_tdb, key );
TALLOC_FREE( user );
}
#endif
}
return user;
}
bool netsamlogon_cache_have(const DOM_SID *user_sid)
{
TALLOC_CTX *mem_ctx = talloc_init("netsamlogon_cache_have");
NET_USER_INFO_3 *user = NULL;
bool result;
if (!mem_ctx)
return False;
user = netsamlogon_cache_get(mem_ctx, user_sid);
result = (user != NULL);
talloc_destroy(mem_ctx);
return result;
}
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