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         uint16_t acct_ctrl;
  72
  73         if (!login_cache_init()) {
  74                 return false;
  75         }
  76
  77         if (pdb_get_nt_username(sampass) == NULL) {
  78                 return false;
  79         }
  80
  81         keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
  82         if (!keystr || !keystr[0]) {
  83                 SAFE_FREE(keystr);
  84                 return false;
  85         }
  86
  87         DEBUG(7, ("Looking up login cache for user %s\n",
  88                   keystr));
  89         databuf = tdb_fetch_bystring(cache, keystr);
  90         SAFE_FREE(keystr);
  91
  92         ZERO_STRUCTP(entry);
  93
  94         if (tdb_unpack (databuf.dptr, databuf.dsize, SAM_CACHE_FORMAT,
  95                         &entry_timestamp,
  96                         &acct_ctrl,
  97                         &entry->bad_password_count,
  98                         &bad_password_time) == -1) {
  99                 DEBUG(7, ("No cache entry found\n"));
 100                 SAFE_FREE(databuf.dptr);
 101                 return false;
 102         }
 103
 104         /*
 105          * Deal with 32-bit acct_ctrl. In the tdb we only store 16-bit
 106          * ("w" in SAM_CACHE_FORMAT). Fixes bug 7253.
 107          */
 108         entry->acct_ctrl = acct_ctrl;
 109
 110         /* Deal with possible 64-bit time_t. */
 111         entry->entry_timestamp = (time_t)entry_timestamp;
 112         entry->bad_password_time = (time_t)bad_password_time;
 113
 114         SAFE_FREE(databuf.dptr);
 115
 116         DEBUG(5, ("Found login cache entry: timestamp %12u, flags 0x%x, count %d, time %12u\n",
 117                   (unsigned int)entry->entry_timestamp, entry->acct_ctrl,
 118                   entry->bad_password_count, (unsigned int)entry->bad_password_time));
 119         return true;
 120 }
 121
 122 bool login_cache_write(const struct samu *sampass,
 123                        const struct login_cache *entry)
 124 {
 125         char *keystr;
 126         TDB_DATA databuf;
 127         bool ret;
 128         uint32_t entry_timestamp;
 129         uint32_t bad_password_time = entry->bad_password_time;
 130
 131         if (!login_cache_init())
 132                 return False;
 133
 134         if (pdb_get_nt_username(sampass) == NULL) {
 135                 return False;
 136         }
 137
 138         keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
 139         if (!keystr || !keystr[0]) {
 140                 SAFE_FREE(keystr);
 141                 return False;
 142         }
 143
 144         entry_timestamp = (uint32_t)time(NULL);
 145
 146         databuf.dsize =
 147                 tdb_pack(NULL, 0, SAM_CACHE_FORMAT,
 148                          entry_timestamp,
 149                          entry->acct_ctrl,
 150                          entry->bad_password_count,
 151                          bad_password_time);
 152         databuf.dptr = SMB_MALLOC_ARRAY(uint8, databuf.dsize);
 153         if (!databuf.dptr) {
 154                 SAFE_FREE(keystr);
 155                 return False;
 156         }
 157
 158         if (tdb_pack(databuf.dptr, databuf.dsize, SAM_CACHE_FORMAT,
 159                          entry_timestamp,
 160                          entry->acct_ctrl,
 161                          entry->bad_password_count,
 162                          bad_password_time)
 163             != databuf.dsize) {
 164                 SAFE_FREE(keystr);
 165                 SAFE_FREE(databuf.dptr);
 166                 return False;
 167         }
 168
 169         ret = tdb_store_bystring(cache, keystr, databuf, 0);
 170         SAFE_FREE(keystr);
 171         SAFE_FREE(databuf.dptr);
 172         return ret == 0;
 173 }
 174
 175 bool login_cache_delentry(const struct samu *sampass)
 176 {
 177         int ret;
 178         char *keystr;
 179
 180         if (!login_cache_init())
 181                 return False;
 182
 183         if (pdb_get_nt_username(sampass) == NULL) {
 184                 return False;
 185         }
 186
 187         keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
 188         if (!keystr || !keystr[0]) {
 189                 SAFE_FREE(keystr);
 190                 return False;
 191         }
 192
 193         DEBUG(9, ("About to delete entry for %s\n", keystr));
 194         ret = tdb_delete_bystring(cache, keystr);
 195         DEBUG(9, ("tdb_delete returned %d\n", ret));
 196
 197         SAFE_FREE(keystr);
 198         return ret == 0;
 199 }