source3/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         cache_fname = cache_path(LOGIN_CACHE_FILE);
  39         if (cache_fname == NULL) {
  40                 DEBUG(0, ("Filename allocation failed.\n"));
  41                 return False;
  42         }
  43
  44         DEBUG(5, ("Opening cache file at %s\n", cache_fname));
  45
  46         cache = tdb_open_log(cache_fname, 0, TDB_DEFAULT,
  47                              O_RDWR|O_CREAT, 0644);
  48
  49         if (!cache)
  50                 DEBUG(5, ("Attempt to open %s failed.\n", cache_fname));
  51
  52         TALLOC_FREE(cache_fname);
  53
  54         return (cache ? True : False);
  55 }
  56
  57 bool login_cache_shutdown(void)
  58 {
  59         /* tdb_close routine returns -1 on error */
  60         if (!cache) return False;
  61         DEBUG(5, ("Closing cache file\n"));
  62         return tdb_close(cache) != -1;
  63 }
  64
  65 /* if we can't read the cache, oh well, no need to return anything */
  66 bool login_cache_read(struct samu *sampass, struct login_cache *entry)
  67 {
  68         char *keystr;
  69         TDB_DATA databuf;
  70         uint32_t entry_timestamp = 0, bad_password_time = 0;
  71
  72         if (!login_cache_init()) {
  73                 return false;
  74         }
  75
  76         if (pdb_get_nt_username(sampass) == NULL) {
  77                 return false;
  78         }
  79
  80         keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
  81         if (!keystr || !keystr[0]) {
  82                 SAFE_FREE(keystr);
  83                 return false;
  84         }
  85
  86         DEBUG(7, ("Looking up login cache for user %s\n",
  87                   keystr));
  88         databuf = tdb_fetch_bystring(cache, keystr);
  89         SAFE_FREE(keystr);
  90
  91         ZERO_STRUCTP(entry);
  92
  93         if (tdb_unpack (databuf.dptr, databuf.dsize, SAM_CACHE_FORMAT,
  94                         &entry_timestamp,
  95                         &entry->acct_ctrl,
  96                         &entry->bad_password_count,
  97                         &bad_password_time) == -1) {
  98                 DEBUG(7, ("No cache entry found\n"));
  99                 SAFE_FREE(databuf.dptr);
 100                 return false;
 101         }
 102
 103         /* Deal with possible 64-bit time_t. */
 104         entry->entry_timestamp = (time_t)entry_timestamp;
 105         entry->bad_password_time = (time_t)bad_password_time;
 106
 107         SAFE_FREE(databuf.dptr);
 108
 109         DEBUG(5, ("Found login cache entry: timestamp %12u, flags 0x%x, count %d, time %12u\n",
 110                   (unsigned int)entry->entry_timestamp, entry->acct_ctrl,
 111                   entry->bad_password_count, (unsigned int)entry->bad_password_time));
 112         return true;
 113 }
 114
 115 bool login_cache_write(const struct samu *sampass,
 116                        const struct login_cache *entry)
 117 {
 118         char *keystr;
 119         TDB_DATA databuf;
 120         bool ret;
 121         uint32_t entry_timestamp;
 122         uint32_t bad_password_time = entry->bad_password_time;
 123
 124         if (!login_cache_init())
 125                 return False;
 126
 127         if (pdb_get_nt_username(sampass) == NULL) {
 128                 return False;
 129         }
 130
 131         keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
 132         if (!keystr || !keystr[0]) {
 133                 SAFE_FREE(keystr);
 134                 return False;
 135         }
 136
 137         entry_timestamp = (uint32_t)time(NULL);
 138
 139         databuf.dsize =
 140                 tdb_pack(NULL, 0, SAM_CACHE_FORMAT,
 141                          entry_timestamp,
 142                          entry->acct_ctrl,
 143                          entry->bad_password_count,
 144                          bad_password_time);
 145         databuf.dptr = SMB_MALLOC_ARRAY(uint8, databuf.dsize);
 146         if (!databuf.dptr) {
 147                 SAFE_FREE(keystr);
 148                 return False;
 149         }
 150
 151         if (tdb_pack(databuf.dptr, databuf.dsize, SAM_CACHE_FORMAT,
 152                          entry_timestamp,
 153                          entry->acct_ctrl,
 154                          entry->bad_password_count,
 155                          bad_password_time)
 156             != databuf.dsize) {
 157                 SAFE_FREE(keystr);
 158                 SAFE_FREE(databuf.dptr);
 159                 return False;
 160         }
 161
 162         ret = tdb_store_bystring(cache, keystr, databuf, 0);
 163         SAFE_FREE(keystr);
 164         SAFE_FREE(databuf.dptr);
 165         return ret == 0;
 166 }
 167
 168 bool login_cache_delentry(const struct samu *sampass)
 169 {
 170         int ret;
 171         char *keystr;
 172
 173         if (!login_cache_init())
 174                 return False;
 175
 176         if (pdb_get_nt_username(sampass) == NULL) {
 177                 return False;
 178         }
 179
 180         keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
 181         if (!keystr || !keystr[0]) {
 182                 SAFE_FREE(keystr);
 183                 return False;
 184         }
 185
 186         DEBUG(9, ("About to delete entry for %s\n", keystr));
 187         ret = tdb_delete_bystring(cache, keystr);
 188         DEBUG(9, ("tdb_delete returned %d\n", ret));
 189
 190         SAFE_FREE(keystr);
 191         return ret == 0;
 192 }