passdb/login_cache.c

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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 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 "includes.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;

        asprintf(&cache_fname, "%s/%s", lp_lockdir(), LOGIN_CACHE_FILE);
        if (cache_fname)
                DEBUG(5, ("Opening cache file at %s\n", cache_fname));
        else {
                DEBUG(0, ("Filename allocation failed.\n"));
                return False;
        }

        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));

        SAFE_FREE(cache_fname);

        return (cache ? True : False);
}

BOOL login_cache_shutdown(void)
{
        /* tdb_close routine returns -1 on error */
        if (!cache) return False;
        DEBUG(5, ("Closing cache file\n"));
        return tdb_close(cache) != -1;
}

/* if we can't read the cache, oh well, no need to return anything */
LOGIN_CACHE * login_cache_read(struct samu *sampass)
{
        TDB_DATA keybuf, databuf;
        LOGIN_CACHE *entry;

        if (!login_cache_init())
                return NULL;

        if (pdb_get_nt_username(sampass) == NULL) {
                return NULL;
        }

        keybuf.dptr = SMB_STRDUP(pdb_get_nt_username(sampass));
        if (!keybuf.dptr || !strlen(keybuf.dptr)) {
                SAFE_FREE(keybuf.dptr);
                return NULL;
        }
        keybuf.dsize = strlen(keybuf.dptr) + 1;

        DEBUG(7, ("Looking up login cache for user %s\n",
                  keybuf.dptr));
        databuf = tdb_fetch(cache, keybuf);
        SAFE_FREE(keybuf.dptr);

        if (!(entry = SMB_MALLOC_P(LOGIN_CACHE))) {
                DEBUG(1, ("Unable to allocate cache entry buffer!\n"));
                SAFE_FREE(databuf.dptr);
                return NULL;
        }

        if (tdb_unpack (databuf.dptr, databuf.dsize, SAM_CACHE_FORMAT,
                        &entry->entry_timestamp, &entry->acct_ctrl, 
                        &entry->bad_password_count, 
                        &entry->bad_password_time) == -1) {
                DEBUG(7, ("No cache entry found\n"));
                SAFE_FREE(entry);
                SAFE_FREE(databuf.dptr);
                return NULL;
        }

        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 entry;
}

BOOL login_cache_write(const struct samu *sampass, LOGIN_CACHE entry)
{

        TDB_DATA keybuf, databuf;
        BOOL ret;

        if (!login_cache_init())
                return False;

        if (pdb_get_nt_username(sampass) == NULL) {
                return False;
        }

        keybuf.dptr = SMB_STRDUP(pdb_get_nt_username(sampass));
        if (!keybuf.dptr || !strlen(keybuf.dptr)) {
                SAFE_FREE(keybuf.dptr);
                return False;
        }
        keybuf.dsize = strlen(keybuf.dptr) + 1;

        entry.entry_timestamp = time(NULL);

        databuf.dsize = 
                tdb_pack(NULL, 0, SAM_CACHE_FORMAT,
                         entry.entry_timestamp,
                         entry.acct_ctrl,
                         entry.bad_password_count,
                         entry.bad_password_time);
        databuf.dptr = SMB_MALLOC_ARRAY(char, databuf.dsize);
        if (!databuf.dptr) {
                SAFE_FREE(keybuf.dptr);
                return False;
        }
                         
        if (tdb_pack(databuf.dptr, databuf.dsize, SAM_CACHE_FORMAT,
                         entry.entry_timestamp,
                         entry.acct_ctrl,
                         entry.bad_password_count,
                         entry.bad_password_time)
            != databuf.dsize) {
                SAFE_FREE(keybuf.dptr);
                SAFE_FREE(databuf.dptr);
                return False;
        }

        ret = tdb_store(cache, keybuf, databuf, 0);
        SAFE_FREE(keybuf.dptr);
        SAFE_FREE(databuf.dptr);
        return ret == 0;
}

BOOL login_cache_delentry(const struct samu *sampass)
{
        int ret;
        TDB_DATA keybuf;
        
        if (!login_cache_init()) 
                return False;   

        if (pdb_get_nt_username(sampass) == NULL) {
                return False;
        }

        keybuf.dptr = SMB_STRDUP(pdb_get_nt_username(sampass));
        if (!keybuf.dptr || !strlen(keybuf.dptr)) {
                SAFE_FREE(keybuf.dptr);
                return False;
        }
        keybuf.dsize = strlen(keybuf.dptr) + 1;
        DEBUG(9, ("About to delete entry for %s\n", keybuf.dptr));
        ret = tdb_delete(cache, keybuf);
        DEBUG(9, ("tdb_delete returned %d\n", ret));
        
        SAFE_FREE(keybuf.dptr);
        return ret == 0;
}

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