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         uint32_t entry_timestamp = 0, bad_password_time = 0;
  71
  72         if (!login_cache_init())
  73                 return NULL;
  74
  75         if (pdb_get_nt_username(sampass) == NULL) {
  76                 return NULL;
  77         }
  78
  79         keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
  80         if (!keystr || !keystr[0]) {
  81                 SAFE_FREE(keystr);
  82                 return NULL;
  83         }
  84
  85         DEBUG(7, ("Looking up login cache for user %s\n",
  86                   keystr));
  87         databuf = tdb_fetch_bystring(cache, keystr);
  88         SAFE_FREE(keystr);
  89
  90         if (!(entry = SMB_MALLOC_P(LOGIN_CACHE))) {
  91                 DEBUG(1, ("Unable to allocate cache entry buffer!\n"));
  92                 SAFE_FREE(databuf.dptr);
  93                 return NULL;
  94         }
  95         ZERO_STRUCTP(entry);
  96
  97         if (tdb_unpack (databuf.dptr, databuf.dsize, SAM_CACHE_FORMAT,
  98                         &entry_timestamp,
  99                         &entry->acct_ctrl,
 100                         &entry->bad_password_count,
 101                         &bad_password_time) == -1) {
 102                 DEBUG(7, ("No cache entry found\n"));
 103                 SAFE_FREE(entry);
 104                 SAFE_FREE(databuf.dptr);
 105                 return NULL;
 106         }
 107
 108         /* Deal with possible 64-bit time_t. */
 109         entry->entry_timestamp = (time_t)entry_timestamp;
 110         entry->bad_password_time = (time_t)bad_password_time;
 111
 112         SAFE_FREE(databuf.dptr);
 113
 114         DEBUG(5, ("Found login cache entry: timestamp %12u, flags 0x%x, count %d, time %12u\n",
 115                   (unsigned int)entry->entry_timestamp, entry->acct_ctrl,
 116                   entry->bad_password_count, (unsigned int)entry->bad_password_time));
 117         return entry;
 118 }
 119
 120 bool login_cache_write(const struct samu *sampass, LOGIN_CACHE entry)
 121 {
 122         char *keystr;
 123         TDB_DATA databuf;
 124         bool ret;
 125         uint32_t entry_timestamp;
 126         uint32_t bad_password_time = (uint32_t)entry.bad_password_time;
 127
 128         if (!login_cache_init())
 129                 return False;
 130
 131         if (pdb_get_nt_username(sampass) == NULL) {
 132                 return False;
 133         }
 134
 135         keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
 136         if (!keystr || !keystr[0]) {
 137                 SAFE_FREE(keystr);
 138                 return False;
 139         }
 140
 141         entry_timestamp = (uint32_t)time(NULL);
 142
 143         databuf.dsize =
 144                 tdb_pack(NULL, 0, SAM_CACHE_FORMAT,
 145                          entry_timestamp,
 146                          entry.acct_ctrl,
 147                          entry.bad_password_count,
 148                          bad_password_time);
 149         databuf.dptr = SMB_MALLOC_ARRAY(uint8, databuf.dsize);
 150         if (!databuf.dptr) {
 151                 SAFE_FREE(keystr);
 152                 return False;
 153         }
 154
 155         if (tdb_pack(databuf.dptr, databuf.dsize, SAM_CACHE_FORMAT,
 156                          entry_timestamp,
 157                          entry.acct_ctrl,
 158                          entry.bad_password_count,
 159                          bad_password_time)
 160             != databuf.dsize) {
 161                 SAFE_FREE(keystr);
 162                 SAFE_FREE(databuf.dptr);
 163                 return False;
 164         }
 165
 166         ret = tdb_store_bystring(cache, keystr, databuf, 0);
 167         SAFE_FREE(keystr);
 168         SAFE_FREE(databuf.dptr);
 169         return ret == 0;
 170 }
 171
 172 bool login_cache_delentry(const struct samu *sampass)
 173 {
 174         int ret;
 175         char *keystr;
 176
 177         if (!login_cache_init())
 178                 return False;
 179
 180         if (pdb_get_nt_username(sampass) == NULL) {
 181                 return False;
 182         }
 183
 184         keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
 185         if (!keystr || !keystr[0]) {
 186                 SAFE_FREE(keystr);
 187                 return False;
 188         }
 189
 190         DEBUG(9, ("About to delete entry for %s\n", keystr));
 191         ret = tdb_delete_bystring(cache, keystr);
 192         DEBUG(9, ("tdb_delete returned %d\n", ret));
 193
 194         SAFE_FREE(keystr);
 195         return ret == 0;
 196 }