2 Unix SMB/CIFS implementation.
3 Copyright (C) Andrew Tridgell 1992-2001
4 Copyright (C) Andrew Bartlett 2002
5 Copyright (C) Rafal Szczesniak 2002
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.
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.
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.
22 /* the Samba secrets database stores any generated, private information
23 such as the local SID and machine trust password */
26 #include "lib/tdb/include/tdbutil.h"
28 #include "system/filesys.h"
32 #define DBGC_CLASS DBGC_PASSDB
34 static struct tdb_wrap *tdb;
37 * Use a TDB to store an incrementing random seed.
39 * Initialised to the current pid, the very first time Samba starts,
40 * and incremented by one each time it is needed.
42 * @note Not called by systems with a working /dev/urandom.
44 static void get_rand_seed(int *new_seed)
48 tdb_change_int32_atomic(tdb->tdb, "INFO/random_seed", new_seed, 1);
52 /* close the secrets database */
53 void secrets_shutdown(void)
58 /* open up the secrets database */
59 BOOL secrets_init(void)
67 pstrcpy(fname, lp_private_dir());
68 pstrcat(fname,"/secrets.tdb");
70 tdb = tdb_wrap_open(talloc_autofree_context(), fname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
73 DEBUG(0,("Failed to open %s\n", fname));
78 * Set a reseed function for the crypto random generator
80 * This avoids a problem where systems without /dev/urandom
81 * could send the same challenge to multiple clients
83 set_rand_reseed_callback(get_rand_seed);
85 /* Ensure that the reseed is done now, while we are root, etc */
86 generate_random_buffer(&dummy, sizeof(dummy));
91 /* read a entry from the secrets database - the caller must free the result
92 if size is non-null then the size of the entry is put in there
94 void *secrets_fetch(const char *key, size_t *size)
100 kbuf.dptr = strdup(key);
101 kbuf.dsize = strlen(key);
102 dbuf = tdb_fetch(tdb->tdb, kbuf);
109 /************************************************************************
110 Routine to fetch the plaintext machine account password for a realm
111 the password is assumed to be a null terminated ascii string
112 ************************************************************************/
113 char *secrets_fetch_machine_password(const char *domain)
117 asprintf(&key, "%s/%s", SECRETS_MACHINE_PASSWORD, domain);
119 ret = (char *)secrets_fetch(key, NULL);
126 /*******************************************************************************
127 Lock the secrets tdb based on a string - this is used as a primitive form of mutex
128 between smbd instances.
129 *******************************************************************************/
131 BOOL secrets_named_mutex(const char *name, uint_t timeout, size_t *p_ref_count)
133 size_t ref_count = *p_ref_count;
140 if (ref_count == 0) {
141 ret = tdb_lock_bystring(tdb->tdb, name, timeout);
143 DEBUG(10,("secrets_named_mutex: got mutex for %s\n", name ));
147 *p_ref_count = ++ref_count;
148 DEBUG(10,("secrets_named_mutex: ref_count for mutex %s = %u\n", name, (uint_t)ref_count ));
153 /*******************************************************************************
154 Unlock a named mutex.
155 *******************************************************************************/
157 void secrets_named_mutex_release(const char *name, size_t *p_ref_count)
159 size_t ref_count = *p_ref_count;
161 SMB_ASSERT(ref_count != 0);
167 if (ref_count == 1) {
168 tdb_unlock_bystring(tdb->tdb, name);
169 DEBUG(10,("secrets_named_mutex: released mutex for %s\n", name ));
172 *p_ref_count = --ref_count;
173 DEBUG(10,("secrets_named_mutex_release: ref_count for mutex %s = %u\n", name, (uint_t)ref_count ));
177 connect to the schannel ldb
179 struct ldb_wrap *secrets_db_connect(TALLOC_CTX *mem_ctx)
182 struct ldb_wrap *ldb;
184 path = private_path(mem_ctx, "secrets.ldb");
189 ldb = ldb_wrap_connect(mem_ctx, path, 0, NULL);