source/passdb/login_cache.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    struct samu 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 3 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, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21
  22 #undef DBGC_CLASS
  23 #define DBGC_CLASS DBGC_PASSDB
  24
  25 #define LOGIN_CACHE_FILE "login_cache.tdb"
  26
  27 #define SAM_CACHE_FORMAT "dwwd"
  28
  29 static TDB_CONTEXT *cache;
  30
  31 bool login_cache_init(void)
  32 {
  33         char* cache_fname = NULL;
  34
  35         /* skip file open if it's already opened */
  36         if (cache) return True;
  37
  38         if (asprintf(&cache_fname, "%s/%s", lp_lockdir(), LOGIN_CACHE_FILE) == -1) {
  39                 DEBUG(0, ("Filename allocation failed.\n"));
  40                 return False;
  41         }
  42
  43         DEBUG(5, ("Opening cache file at %s\n", cache_fname));
  44
  45         cache = tdb_open_log(cache_fname, 0, TDB_DEFAULT,
  46                              O_RDWR|O_CREAT, 0644);
  47
  48         if (!cache)
  49                 DEBUG(5, ("Attempt to open %s failed.\n", cache_fname));
  50
  51         SAFE_FREE(cache_fname);
  52
  53         return (cache ? True : False);
  54 }
  55
  56 bool login_cache_shutdown(void)
  57 {
  58         /* tdb_close routine returns -1 on error */
  59         if (!cache) return False;
  60         DEBUG(5, ("Closing cache file\n"));
  61         return tdb_close(cache) != -1;
  62 }
  63
  64 /* if we can't read the cache, oh well, no need to return anything */
  65 LOGIN_CACHE * login_cache_read(struct samu *sampass)
  66 {
  67         char *keystr;
  68         TDB_DATA databuf;
  69         LOGIN_CACHE *entry;
  70
  71         if (!login_cache_init())
  72                 return NULL;
  73
  74         if (pdb_get_nt_username(sampass) == NULL) {
  75                 return NULL;
  76         }
  77
  78         keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
  79         if (!keystr || !keystr[0]) {
  80                 SAFE_FREE(keystr);
  81                 return NULL;
  82         }
  83
  84         DEBUG(7, ("Looking up login cache for user %s\n",
  85                   keystr));
  86         databuf = tdb_fetch_bystring(cache, keystr);
  87         SAFE_FREE(keystr);
  88
  89         if (!(entry = SMB_MALLOC_P(LOGIN_CACHE))) {
  90                 DEBUG(1, ("Unable to allocate cache entry buffer!\n"));
  91                 SAFE_FREE(databuf.dptr);
  92                 return NULL;
  93         }
  94
  95         if (tdb_unpack (databuf.dptr, databuf.dsize, SAM_CACHE_FORMAT,
  96                         &entry->entry_timestamp, &entry->acct_ctrl,
  97                         &entry->bad_password_count,
  98                         &entry->bad_password_time) == -1) {
  99                 DEBUG(7, ("No cache entry found\n"));
 100                 SAFE_FREE(entry);
 101                 SAFE_FREE(databuf.dptr);
 102                 return NULL;
 103         }
 104
 105         SAFE_FREE(databuf.dptr);
 106
 107         DEBUG(5, ("Found login cache entry: timestamp %12u, flags 0x%x, count %d, time %12u\n",
 108                   (unsigned int)entry->entry_timestamp, entry->acct_ctrl,
 109                   entry->bad_password_count, (unsigned int)entry->bad_password_time));
 110         return entry;
 111 }
 112
 113 bool login_cache_write(const struct samu *sampass, LOGIN_CACHE entry)
 114 {
 115         char *keystr;
 116         TDB_DATA databuf;
 117         bool ret;
 118
 119         if (!login_cache_init())
 120                 return False;
 121
 122         if (pdb_get_nt_username(sampass) == NULL) {
 123                 return False;
 124         }
 125
 126         keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
 127         if (!keystr || !keystr[0]) {
 128                 SAFE_FREE(keystr);
 129                 return False;
 130         }
 131
 132         entry.entry_timestamp = time(NULL);
 133
 134         databuf.dsize =
 135                 tdb_pack(NULL, 0, SAM_CACHE_FORMAT,
 136                          entry.entry_timestamp,
 137                          entry.acct_ctrl,
 138                          entry.bad_password_count,
 139                          entry.bad_password_time);
 140         databuf.dptr = SMB_MALLOC_ARRAY(uint8, databuf.dsize);
 141         if (!databuf.dptr) {
 142                 SAFE_FREE(keystr);
 143                 return False;
 144         }
 145
 146         if (tdb_pack(databuf.dptr, databuf.dsize, SAM_CACHE_FORMAT,
 147                          entry.entry_timestamp,
 148                          entry.acct_ctrl,
 149                          entry.bad_password_count,
 150                          entry.bad_password_time)
 151             != databuf.dsize) {
 152                 SAFE_FREE(keystr);
 153                 SAFE_FREE(databuf.dptr);
 154                 return False;
 155         }
 156
 157         ret = tdb_store_bystring(cache, keystr, databuf, 0);
 158         SAFE_FREE(keystr);
 159         SAFE_FREE(databuf.dptr);
 160         return ret == 0;
 161 }
 162
 163 bool login_cache_delentry(const struct samu *sampass)
 164 {
 165         int ret;
 166         char *keystr;
 167
 168         if (!login_cache_init())
 169                 return False;
 170
 171         if (pdb_get_nt_username(sampass) == NULL) {
 172                 return False;
 173         }
 174
 175         keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
 176         if (!keystr || !keystr[0]) {
 177                 SAFE_FREE(keystr);
 178                 return False;
 179         }
 180
 181         DEBUG(9, ("About to delete entry for %s\n", keystr));
 182         ret = tdb_delete_bystring(cache, keystr);
 183         DEBUG(9, ("tdb_delete returned %d\n", ret));
 184
 185         SAFE_FREE(keystr);
 186         return ret == 0;
 187 }