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 LOGIN_CACHE * login_cache_read(struct samu *sampass)
  67 {
  68         char *keystr;
  69         TDB_DATA databuf;
  70         LOGIN_CACHE *entry;
  71         uint32_t entry_timestamp = 0, bad_password_time = 0;
  72         uint16_t acct_ctrl;
  73
  74         if (!login_cache_init())
  75                 return NULL;
  76
  77         if (pdb_get_nt_username(sampass) == NULL) {
  78                 return NULL;
  79         }
  80
  81         keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
  82         if (!keystr || !keystr[0]) {
  83                 SAFE_FREE(keystr);
  84                 return NULL;
  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         if (!(entry = SMB_MALLOC_P(LOGIN_CACHE))) {
  93                 DEBUG(1, ("Unable to allocate cache entry buffer!\n"));
  94                 SAFE_FREE(databuf.dptr);
  95                 return NULL;
  96         }
  97         ZERO_STRUCTP(entry);
  98
  99         if (tdb_unpack (databuf.dptr, databuf.dsize, SAM_CACHE_FORMAT,
 100                         &entry_timestamp,
 101                         &acct_ctrl,
 102                         &entry->bad_password_count,
 103                         &bad_password_time) == -1) {
 104                 DEBUG(7, ("No cache entry found\n"));
 105                 SAFE_FREE(entry);
 106                 SAFE_FREE(databuf.dptr);
 107                 return NULL;
 108         }
 109
 110         /*
 111          * Deal with 32-bit acct_ctrl. In the tdb we only store 16-bit
 112          * ("w" in SAM_CACHE_FORMAT). Fixes bug 7253.
 113          */
 114         entry->acct_ctrl = acct_ctrl;
 115
 116         /* Deal with possible 64-bit time_t. */
 117         entry->entry_timestamp = (time_t)entry_timestamp;
 118         entry->bad_password_time = (time_t)bad_password_time;
 119
 120         SAFE_FREE(databuf.dptr);
 121
 122         DEBUG(5, ("Found login cache entry: timestamp %12u, flags 0x%x, count %d, time %12u\n",
 123                   (unsigned int)entry->entry_timestamp, entry->acct_ctrl,
 124                   entry->bad_password_count, (unsigned int)entry->bad_password_time));
 125         return entry;
 126 }
 127
 128 bool login_cache_write(const struct samu *sampass, LOGIN_CACHE entry)
 129 {
 130         char *keystr;
 131         TDB_DATA databuf;
 132         bool ret;
 133         uint32_t entry_timestamp;
 134         uint32_t bad_password_time = (uint32_t)entry.bad_password_time;
 135
 136         if (!login_cache_init())
 137                 return False;
 138
 139         if (pdb_get_nt_username(sampass) == NULL) {
 140                 return False;
 141         }
 142
 143         keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
 144         if (!keystr || !keystr[0]) {
 145                 SAFE_FREE(keystr);
 146                 return False;
 147         }
 148
 149         entry_timestamp = (uint32_t)time(NULL);
 150
 151         databuf.dsize =
 152                 tdb_pack(NULL, 0, SAM_CACHE_FORMAT,
 153                          entry_timestamp,
 154                          entry.acct_ctrl,
 155                          entry.bad_password_count,
 156                          bad_password_time);
 157         databuf.dptr = SMB_MALLOC_ARRAY(uint8, databuf.dsize);
 158         if (!databuf.dptr) {
 159                 SAFE_FREE(keystr);
 160                 return False;
 161         }
 162
 163         if (tdb_pack(databuf.dptr, databuf.dsize, SAM_CACHE_FORMAT,
 164                          entry_timestamp,
 165                          entry.acct_ctrl,
 166                          entry.bad_password_count,
 167                          bad_password_time)
 168             != databuf.dsize) {
 169                 SAFE_FREE(keystr);
 170                 SAFE_FREE(databuf.dptr);
 171                 return False;
 172         }
 173
 174         ret = tdb_store_bystring(cache, keystr, databuf, 0);
 175         SAFE_FREE(keystr);
 176         SAFE_FREE(databuf.dptr);
 177         return ret == 0;
 178 }
 179
 180 bool login_cache_delentry(const struct samu *sampass)
 181 {
 182         int ret;
 183         char *keystr;
 184
 185         if (!login_cache_init())
 186                 return False;
 187
 188         if (pdb_get_nt_username(sampass) == NULL) {
 189                 return False;
 190         }
 191
 192         keystr = SMB_STRDUP(pdb_get_nt_username(sampass));
 193         if (!keystr || !keystr[0]) {
 194                 SAFE_FREE(keystr);
 195                 return False;
 196         }
 197
 198         DEBUG(9, ("About to delete entry for %s\n", keystr));
 199         ret = tdb_delete_bystring(cache, keystr);
 200         DEBUG(9, ("tdb_delete returned %d\n", ret));
 201
 202         SAFE_FREE(keystr);
 203         return ret == 0;
 204 }