source3/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_smb_passwd_file());
  38         p = strrchr(fname, '/');
  39         if(!p) return False;
  40
  41         *p = 0;
  42         pstrcat(fname,"/secrets.tdb");
  43
  44         tdb = tdb_open(fname, 0, 0, O_RDWR|O_CREAT, 0600);
  45
  46         if (!tdb) {
  47                 DEBUG(0,("Failed to open %s\n", fname));
  48                 return False;
  49         }
  50         return True;
  51 }
  52
  53 /* read a entry from the secrets database - the caller must free the result
  54    if size is non-null then the size of the entry is put in there
  55  */
  56 void *secrets_fetch(char *key, size_t *size)
  57 {
  58         TDB_DATA kbuf, dbuf;
  59         if (!tdb) return False;
  60         kbuf.dptr = key;
  61         kbuf.dsize = strlen(key);
  62         dbuf = tdb_fetch(tdb, kbuf);
  63         if (size) *size = dbuf.dsize;
  64         return dbuf.dptr;
  65 }
  66
  67 /* store a secrets entry
  68  */
  69 BOOL secrets_store(char *key, void *data, size_t size)
  70 {
  71         TDB_DATA kbuf, dbuf;
  72         if (!tdb) return False;
  73         kbuf.dptr = key;
  74         kbuf.dsize = strlen(key);
  75         dbuf.dptr = data;
  76         dbuf.dsize = size;
  77         return tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) == 0;
  78 }
  79
  80
  81 /* delete a secets database entry
  82  */
  83 BOOL secrets_delete(char *key)
  84 {
  85         TDB_DATA kbuf;
  86         if (!tdb) return False;
  87         kbuf.dptr = key;
  88         kbuf.dsize = strlen(key);
  89         return tdb_delete(tdb, kbuf) == 0;
  90 }
  91
  92 BOOL secrets_store_domain_sid(char *domain, DOM_SID *sid)
  93 {
  94         fstring key;
  95
  96         slprintf(key, sizeof(key), "%s/%s", SECRETS_DOMAIN_SID, domain);
  97         return secrets_store(key, sid, sizeof(DOM_SID));
  98 }
  99
 100 BOOL secrets_fetch_domain_sid(char *domain, DOM_SID *sid)
 101 {
 102         DOM_SID *dyn_sid;
 103         fstring key;
 104         size_t size;
 105
 106         slprintf(key, sizeof(key), "%s/%s", SECRETS_DOMAIN_SID, domain);
 107         dyn_sid = (DOM_SID *)secrets_fetch(key, &size);
 108
 109         if (dyn_sid == NULL)
 110                 return False;
 111
 112         if (size != sizeof(DOM_SID))
 113         {
 114                 free(dyn_sid);
 115                 return False;
 116         }
 117
 118         *sid = *dyn_sid;
 119         free(dyn_sid);
 120         return True;
 121 }
 122
 123
 124 /************************************************************************
 125 form a key for fetching a domain trust password
 126 ************************************************************************/
 127 static char *trust_keystr(char *domain)
 128 {
 129         static fstring keystr;
 130         slprintf(keystr,sizeof(keystr),"%s/%s", SECRETS_MACHINE_ACCT_PASS, domain);
 131         return keystr;
 132 }
 133
 134 /************************************************************************
 135  Routine to get the trust account password for a domain.
 136  The user of this function must have locked the trust password file.
 137 ************************************************************************/
 138 BOOL secrets_fetch_trust_account_password(char *domain, uint8 ret_pwd[16],
 139                                           time_t *pass_last_set_time)
 140 {
 141         struct machine_acct_pass *pass;
 142         size_t size;
 143
 144         if (!(pass = secrets_fetch(trust_keystr(domain), &size)) ||
 145             size != sizeof(*pass)) return False;
 146
 147         if (pass_last_set_time) *pass_last_set_time = pass->mod_time;
 148         memcpy(ret_pwd, pass->hash, 16);
 149         free(pass);
 150         return True;
 151 }
 152
 153
 154 /************************************************************************
 155  Routine to set the trust account password for a domain.
 156 ************************************************************************/
 157 BOOL secrets_store_trust_account_password(char *domain, uint8 new_pwd[16])
 158 {
 159         struct machine_acct_pass pass;
 160
 161         pass.mod_time = time(NULL);
 162         memcpy(pass.hash, new_pwd, 16);
 163
 164         return secrets_store(trust_keystr(domain), (void *)&pass, sizeof(pass));
 165 }