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/*
Unix SMB/CIFS implementation.
struct samu local cache for
Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2004.
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"
#include "system/filesys.h"
#include "passdb.h"
#include "util_tdb.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_PASSDB
#define LOGIN_CACHE_FILE "login_cache.tdb"
#define SAM_CACHE_FORMAT "dwwd"
static TDB_CONTEXT *cache;
bool login_cache_init(void)
{
char* cache_fname = NULL;
/* skip file open if it's already opened */
if (cache) return True;
cache_fname = cache_path(talloc_tos(), LOGIN_CACHE_FILE);
if (cache_fname == NULL) {
DEBUG(0, ("Filename allocation failed.\n"));
return False;
}
DEBUG(5, ("Opening cache file at %s\n", cache_fname));
cache = tdb_open_log(cache_fname, 0, TDB_DEFAULT,
O_RDWR|O_CREAT, 0644);
if (!cache)
DEBUG(5, ("Attempt to open %s failed.\n", cache_fname));
TALLOC_FREE(cache_fname);
return (cache ? True : False);
}
bool login_cache_shutdown(void)
{
/* tdb_close routine returns non-zero on error */
if (!cache) return False;
DEBUG(5, ("Closing cache file\n"));
return tdb_close(cache) == 0;
}
/* if we can't read the cache, oh well, no need to return anything */
bool login_cache_read(struct samu *sampass, struct login_cache *entry)
{
char *keystr;
TDB_DATA databuf;
uint32_t entry_timestamp = 0, bad_password_time = 0;
uint16_t acct_ctrl;
if (!login_cache_init()) {
return false;
}
if (pdb_get_nt_username(sampass) == NULL) {
return false;
}
keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
if (!keystr || !keystr[0]) {
SAFE_FREE(keystr);
return false;
}
DEBUG(7, ("Looking up login cache for user %s\n",
keystr));
databuf = tdb_fetch_bystring(cache, keystr);
SAFE_FREE(keystr);
ZERO_STRUCTP(entry);
if (tdb_unpack (databuf.dptr, databuf.dsize, SAM_CACHE_FORMAT,
&entry_timestamp,
&acct_ctrl,
&entry->bad_password_count,
&bad_password_time) == -1) {
DEBUG(7, ("No cache entry found\n"));
SAFE_FREE(databuf.dptr);
return false;
}
/*
* Deal with 32-bit acct_ctrl. In the tdb we only store 16-bit
* ("w" in SAM_CACHE_FORMAT). Fixes bug 7253.
*/
entry->acct_ctrl = acct_ctrl;
/* Deal with possible 64-bit time_t. */
entry->entry_timestamp = (time_t)entry_timestamp;
entry->bad_password_time = (time_t)bad_password_time;
SAFE_FREE(databuf.dptr);
DEBUG(5, ("Found login cache entry: timestamp %12u, flags 0x%x, count %d, time %12u\n",
(unsigned int)entry->entry_timestamp, entry->acct_ctrl,
entry->bad_password_count, (unsigned int)entry->bad_password_time));
return true;
}
bool login_cache_write(const struct samu *sampass,
const struct login_cache *entry)
{
char *keystr;
TDB_DATA databuf;
bool ret;
uint32_t entry_timestamp;
uint32_t bad_password_time = entry->bad_password_time;
if (!login_cache_init())
return False;
if (pdb_get_nt_username(sampass) == NULL) {
return False;
}
keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
if (!keystr || !keystr[0]) {
SAFE_FREE(keystr);
return False;
}
entry_timestamp = (uint32_t)time(NULL);
databuf.dsize =
tdb_pack(NULL, 0, SAM_CACHE_FORMAT,
entry_timestamp,
entry->acct_ctrl,
entry->bad_password_count,
bad_password_time);
databuf.dptr = SMB_MALLOC_ARRAY(uint8_t, databuf.dsize);
if (!databuf.dptr) {
SAFE_FREE(keystr);
return False;
}
if (tdb_pack(databuf.dptr, databuf.dsize, SAM_CACHE_FORMAT,
entry_timestamp,
entry->acct_ctrl,
entry->bad_password_count,
bad_password_time)
!= databuf.dsize) {
SAFE_FREE(keystr);
SAFE_FREE(databuf.dptr);
return False;
}
ret = tdb_store_bystring(cache, keystr, databuf, 0);
SAFE_FREE(keystr);
SAFE_FREE(databuf.dptr);
return ret == 0;
}
bool login_cache_delentry(const struct samu *sampass)
{
int ret;
char *keystr;
if (!login_cache_init())
return False;
if (pdb_get_nt_username(sampass) == NULL) {
return False;
}
keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
if (!keystr || !keystr[0]) {
SAFE_FREE(keystr);
return False;
}
DEBUG(9, ("About to delete entry for %s\n", keystr));
ret = tdb_delete_bystring(cache, keystr);
DEBUG(9, ("tdb_delete returned %d\n", ret));
SAFE_FREE(keystr);
return ret == 0;
}
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