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
  34         if (tdb) return True;
  35
  36         pstrcpy(fname, lp_private_dir());
  37         pstrcat(fname,"/secrets.tdb");
  38
  39         tdb = tdb_open(fname, 0, 0, O_RDWR|O_CREAT, 0600);
  40
  41         if (!tdb) {
  42                 DEBUG(0,("Failed to open %s\n", fname));
  43                 return False;
  44         }
  45         return True;
  46 }
  47
  48 /* read a entry from the secrets database - the caller must free the result
  49    if size is non-null then the size of the entry is put in there
  50  */
  51 void *secrets_fetch(char *key, size_t *size)
  52 {
  53         TDB_DATA kbuf, dbuf;
  54         if (!tdb) return False;
  55         kbuf.dptr = key;
  56         kbuf.dsize = strlen(key);
  57         dbuf = tdb_fetch(tdb, kbuf);
  58         if (size) *size = dbuf.dsize;
  59         return dbuf.dptr;
  60 }
  61
  62 /* store a secrets entry
  63  */
  64 BOOL secrets_store(char *key, void *data, size_t size)
  65 {
  66         TDB_DATA kbuf, dbuf;
  67         if (!tdb) return False;
  68         kbuf.dptr = key;
  69         kbuf.dsize = strlen(key);
  70         dbuf.dptr = data;
  71         dbuf.dsize = size;
  72         return tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) == 0;
  73 }
  74
  75
  76 /* delete a secets database entry
  77  */
  78 BOOL secrets_delete(char *key)
  79 {
  80         TDB_DATA kbuf;
  81         if (!tdb) return False;
  82         kbuf.dptr = key;
  83         kbuf.dsize = strlen(key);
  84         return tdb_delete(tdb, kbuf) == 0;
  85 }
  86
  87 BOOL secrets_store_domain_sid(char *domain, DOM_SID *sid)
  88 {
  89         fstring key;
  90
  91         slprintf(key, sizeof(key)-1, "%s/%s", SECRETS_DOMAIN_SID, domain);
  92         return secrets_store(key, sid, sizeof(DOM_SID));
  93 }
  94
  95 BOOL secrets_fetch_domain_sid(char *domain, DOM_SID *sid)
  96 {
  97         DOM_SID *dyn_sid;
  98         fstring key;
  99         size_t size;
 100
 101         slprintf(key, sizeof(key)-1, "%s/%s", SECRETS_DOMAIN_SID, domain);
 102         dos_to_unix(key, True);                /* Convert key to unix-codepage */
 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 char *trust_keystr(char *domain)
 124 {
 125         static fstring keystr;
 126         fstring dos_domain;
 127
 128         fstrcpy(dos_domain, domain);
 129         unix_to_dos(dos_domain, True);
 130
 131         slprintf(keystr,sizeof(keystr)-1,"%s/%s",
 132                  SECRETS_MACHINE_ACCT_PASS, dos_domain);
 133
 134         return keystr;
 135 }
 136
 137 /************************************************************************
 138  Routine to get the trust account password for a domain.
 139  The user of this function must have locked the trust password file.
 140 ************************************************************************/
 141 BOOL secrets_fetch_trust_account_password(char *domain, uint8 ret_pwd[16],
 142                                           time_t *pass_last_set_time)
 143 {
 144         struct machine_acct_pass *pass;
 145         size_t size;
 146
 147         if (!(pass = secrets_fetch(trust_keystr(domain), &size)) ||
 148             size != sizeof(*pass))
 149                 return False;
 150
 151         if (pass_last_set_time) *pass_last_set_time = pass->mod_time;
 152         memcpy(ret_pwd, pass->hash, 16);
 153         free(pass);
 154         return True;
 155 }
 156
 157
 158 /************************************************************************
 159  Routine to set the trust account password for a domain.
 160 ************************************************************************/
 161 BOOL secrets_store_trust_account_password(char *domain, uint8 new_pwd[16])
 162 {
 163         struct machine_acct_pass pass;
 164
 165         pass.mod_time = time(NULL);
 166         memcpy(pass.hash, new_pwd, 16);
 167
 168         return secrets_store(trust_keystr(domain), (void *)&pass, sizeof(pass));
 169 }
 170
 171 /************************************************************************
 172  Routine to delete the trust account password file for a domain.
 173 ************************************************************************/
 174
 175 BOOL trust_password_delete(char *domain)
 176 {
 177         return secrets_delete(trust_keystr(domain));
 178 }