source/passdb/secrets.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0.
   4    Samba registry functions
   5    Copyright (C) Andrew Tridgell 1992-1998
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 /* the Samba secrets database stores any generated, private information
  23    such as the local SID and machine trust password */
  24
  25 #include "includes.h"
  26
  27 static TDB_CONTEXT *tdb;
  28
  29 /* open up the secrets database */
  30 BOOL secrets_init(void)
  31 {
  32         pstring fname;
  33         char *p;
  34
  35         if (tdb) return True;
  36
  37         pstrcpy(fname, lp_private_dir());
  38         pstrcat(fname,"/secrets.tdb");
  39
  40         tdb = tdb_open(fname, 0, 0, O_RDWR|O_CREAT, 0600);
  41
  42         if (!tdb) {
  43                 DEBUG(0,("Failed to open %s\n", fname));
  44                 return False;
  45         }
  46         return True;
  47 }
  48
  49 /* read a entry from the secrets database - the caller must free the result
  50    if size is non-null then the size of the entry is put in there
  51  */
  52 void *secrets_fetch(char *key, size_t *size)
  53 {
  54         TDB_DATA kbuf, dbuf;
  55         if (!tdb) return False;
  56         kbuf.dptr = key;
  57         kbuf.dsize = strlen(key);
  58         dbuf = tdb_fetch(tdb, kbuf);
  59         if (size) *size = dbuf.dsize;
  60         return dbuf.dptr;
  61 }
  62
  63 /* store a secrets entry
  64  */
  65 BOOL secrets_store(char *key, void *data, size_t size)
  66 {
  67         TDB_DATA kbuf, dbuf;
  68         if (!tdb) return False;
  69         kbuf.dptr = key;
  70         kbuf.dsize = strlen(key);
  71         dbuf.dptr = data;
  72         dbuf.dsize = size;
  73         return tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) == 0;
  74 }
  75
  76
  77 /* delete a secets database entry
  78  */
  79 BOOL secrets_delete(char *key)
  80 {
  81         TDB_DATA kbuf;
  82         if (!tdb) return False;
  83         kbuf.dptr = key;
  84         kbuf.dsize = strlen(key);
  85         return tdb_delete(tdb, kbuf) == 0;
  86 }
  87
  88 BOOL secrets_store_domain_sid(char *domain, DOM_SID *sid)
  89 {
  90         fstring key;
  91
  92         slprintf(key, sizeof(key), "%s/%s", SECRETS_DOMAIN_SID, domain);
  93         return secrets_store(key, sid, sizeof(DOM_SID));
  94 }
  95
  96 BOOL secrets_fetch_domain_sid(char *domain, DOM_SID *sid)
  97 {
  98         DOM_SID *dyn_sid;
  99         fstring key;
 100         size_t size;
 101
 102         slprintf(key, sizeof(key), "%s/%s", SECRETS_DOMAIN_SID, domain);
 103         dyn_sid = (DOM_SID *)secrets_fetch(key, &size);
 104
 105         if (dyn_sid == NULL)
 106                 return False;
 107
 108         if (size != sizeof(DOM_SID))
 109         {
 110                 free(dyn_sid);
 111                 return False;
 112         }
 113
 114         *sid = *dyn_sid;
 115         free(dyn_sid);
 116         return True;
 117 }
 118
 119
 120 /************************************************************************
 121 form a key for fetching a domain trust password
 122 ************************************************************************/
 123 static char *trust_keystr(char *domain)
 124 {
 125         static fstring keystr;
 126         slprintf(keystr,sizeof(keystr),"%s/%s", SECRETS_MACHINE_ACCT_PASS, domain);
 127         return keystr;
 128 }
 129
 130 /************************************************************************
 131  Routine to get the trust account password for a domain.
 132  The user of this function must have locked the trust password file.
 133 ************************************************************************/
 134 BOOL secrets_fetch_trust_account_password(char *domain, uint8 ret_pwd[16],
 135                                           time_t *pass_last_set_time)
 136 {
 137         struct machine_acct_pass *pass;
 138         size_t size;
 139
 140         if (!(pass = secrets_fetch(trust_keystr(domain), &size)) ||
 141             size != sizeof(*pass)) return False;
 142
 143         if (pass_last_set_time) *pass_last_set_time = pass->mod_time;
 144         memcpy(ret_pwd, pass->hash, 16);
 145         free(pass);
 146         return True;
 147 }
 148
 149
 150 /************************************************************************
 151  Routine to set the trust account password for a domain.
 152 ************************************************************************/
 153 BOOL secrets_store_trust_account_password(char *domain, uint8 new_pwd[16])
 154 {
 155         struct machine_acct_pass pass;
 156
 157         pass.mod_time = time(NULL);
 158         memcpy(pass.hash, new_pwd, 16);
 159
 160         return secrets_store(trust_keystr(domain), (void *)&pass, sizeof(pass));
 161 }