source3/passdb/login_cache.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SAM_ACCOUNT local cache for
   4    Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2004.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 #undef DBGC_CLASS
  24 #define DBGC_CLASS DBGC_PASSDB
  25
  26 #define LOGIN_CACHE_FILE "login_cache.tdb"
  27
  28 #define SAM_CACHE_FORMAT "dwwd"
  29
  30 static TDB_CONTEXT *cache;
  31
  32 BOOL login_cache_init(void)
  33 {
  34         char* cache_fname = NULL;
  35
  36         /* skip file open if it's already opened */
  37         if (cache) return True;
  38
  39         asprintf(&cache_fname, "%s/%s", lp_lockdir(), LOGIN_CACHE_FILE);
  40         if (cache_fname)
  41                 DEBUG(5, ("Opening cache file at %s\n", cache_fname));
  42         else {
  43                 DEBUG(0, ("Filename allocation failed.\n"));
  44                 return False;
  45         }
  46
  47         cache = tdb_open_log(cache_fname, 0, TDB_DEFAULT,
  48                              O_RDWR|O_CREAT, 0644);
  49
  50         if (!cache)
  51                 DEBUG(5, ("Attempt to open %s failed.\n", cache_fname));
  52
  53         SAFE_FREE(cache_fname);
  54
  55         return (cache ? True : False);
  56 }
  57
  58 BOOL login_cache_shutdown(void)
  59 {
  60         /* tdb_close routine returns -1 on error */
  61         if (!cache) return False;
  62         DEBUG(5, ("Closing cache file\n"));
  63         return tdb_close(cache) != -1;
  64 }
  65
  66 /* if we can't read the cache, oh well, no need to return anything */
  67 LOGIN_CACHE * login_cache_read(SAM_ACCOUNT *sampass)
  68 {
  69         TDB_DATA keybuf, databuf;
  70         LOGIN_CACHE *entry;
  71
  72         if (!login_cache_init())
  73                 return NULL;
  74
  75         keybuf.dptr = strdup(pdb_get_nt_username(sampass));
  76         if (!keybuf.dptr || !strlen(keybuf.dptr)) {
  77                 SAFE_FREE(keybuf.dptr);
  78                 return NULL;
  79         }
  80         keybuf.dsize = strlen(keybuf.dptr) + 1;
  81
  82         DEBUG(7, ("Looking up login cache for user %s\n",
  83                   keybuf.dptr));
  84         databuf = tdb_fetch(cache, keybuf);
  85         SAFE_FREE(keybuf.dptr);
  86
  87         if (!(entry = malloc(sizeof(LOGIN_CACHE)))) {
  88                 DEBUG(1, ("Unable to allocate cache entry buffer!\n"));
  89                 SAFE_FREE(databuf.dptr);
  90                 return NULL;
  91         }
  92
  93         if (tdb_unpack (databuf.dptr, databuf.dsize, SAM_CACHE_FORMAT,
  94                         &entry->entry_timestamp, &entry->acct_ctrl,
  95                         &entry->bad_password_count,
  96                         &entry->bad_password_time) == -1) {
  97                 DEBUG(7, ("No cache entry found\n"));
  98                 SAFE_FREE(entry);
  99                 SAFE_FREE(databuf.dptr);
 100                 return NULL;
 101         }
 102
 103         SAFE_FREE(databuf.dptr);
 104
 105         DEBUG(5, ("Found login cache entry: timestamp %12u, flags 0x%x, count %d, time %12u\n",
 106                   (unsigned int)entry->entry_timestamp, entry->acct_ctrl,
 107                   entry->bad_password_count, (unsigned int)entry->bad_password_time));
 108         return entry;
 109 }
 110
 111 BOOL login_cache_write(const SAM_ACCOUNT *sampass, LOGIN_CACHE entry)
 112 {
 113
 114         TDB_DATA keybuf, databuf;
 115         BOOL ret;
 116
 117         if (!login_cache_init())
 118                 return False;
 119
 120         keybuf.dptr = strdup(pdb_get_nt_username(sampass));
 121         if (!keybuf.dptr || !strlen(keybuf.dptr)) {
 122                 SAFE_FREE(keybuf.dptr);
 123                 return False;
 124         }
 125         keybuf.dsize = strlen(keybuf.dptr) + 1;
 126
 127         entry.entry_timestamp = time(NULL);
 128
 129         databuf.dsize =
 130                 tdb_pack(NULL, 0, SAM_CACHE_FORMAT,
 131                          entry.entry_timestamp,
 132                          entry.acct_ctrl,
 133                          entry.bad_password_count,
 134                          entry.bad_password_time);
 135         databuf.dptr = malloc(databuf.dsize);
 136         if (!databuf.dptr) {
 137                 SAFE_FREE(keybuf.dptr);
 138                 return False;
 139         }
 140
 141         if (tdb_pack(databuf.dptr, databuf.dsize, SAM_CACHE_FORMAT,
 142                          entry.entry_timestamp,
 143                          entry.acct_ctrl,
 144                          entry.bad_password_count,
 145                          entry.bad_password_time)
 146             != databuf.dsize) {
 147                 SAFE_FREE(keybuf.dptr);
 148                 SAFE_FREE(databuf.dptr);
 149                 return False;
 150         }
 151
 152         ret = tdb_store(cache, keybuf, databuf, 0);
 153         SAFE_FREE(keybuf.dptr);
 154         SAFE_FREE(databuf.dptr);
 155         return ret == 0;
 156 }
 157
 158 BOOL login_cache_delentry(const SAM_ACCOUNT *sampass)
 159 {
 160         int ret;
 161         TDB_DATA keybuf;
 162
 163         if (!login_cache_init())
 164                 return False;
 165
 166         keybuf.dptr = strdup(pdb_get_nt_username(sampass));
 167         if (!keybuf.dptr || !strlen(keybuf.dptr)) {
 168                 SAFE_FREE(keybuf.dptr);
 169                 return False;
 170         }
 171         keybuf.dsize = strlen(keybuf.dptr) + 1;
 172         DEBUG(9, ("About to delete entry for %s\n", keybuf.dptr));
 173         ret = tdb_delete(cache, keybuf);
 174         DEBUG(9, ("tdb_delete returned %d\n", ret));
 175
 176         SAFE_FREE(keybuf.dptr);
 177         return ret == 0;
 178 }
 179