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"
30 #define DBGC_CLASS DBGC_PASSDB
32 static struct tdb_wrap *tdb;
35 * Use a TDB to store an incrementing random seed.
37 * Initialised to the current pid, the very first time Samba starts,
38 * and incremented by one each time it is needed.
40 * @note Not called by systems with a working /dev/urandom.
42 static void get_rand_seed(int *new_seed)
46 tdb_change_int32_atomic(tdb->tdb, "INFO/random_seed", new_seed, 1);
50 /* close the secrets database */
51 void secrets_shutdown(void)
56 /* open up the secrets database */
57 BOOL secrets_init(void)
65 pstrcpy(fname, lp_private_dir());
66 pstrcat(fname,"/secrets.tdb");
68 tdb = tdb_wrap_open(talloc_autofree_context(), fname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
71 DEBUG(0,("Failed to open %s\n", fname));
76 * Set a reseed function for the crypto random generator
78 * This avoids a problem where systems without /dev/urandom
79 * could send the same challenge to multiple clients
81 set_rand_reseed_callback(get_rand_seed);
83 /* Ensure that the reseed is done now, while we are root, etc */
84 generate_random_buffer(&dummy, sizeof(dummy));
89 /* read a entry from the secrets database - the caller must free the result
90 if size is non-null then the size of the entry is put in there
92 void *secrets_fetch(const char *key, size_t *size)
98 kbuf.dptr = strdup(key);
99 kbuf.dsize = strlen(key);
100 dbuf = tdb_fetch(tdb->tdb, kbuf);
107 /************************************************************************
108 Routine to fetch the plaintext machine account password for a realm
109 the password is assumed to be a null terminated ascii string
110 ************************************************************************/
111 char *secrets_fetch_machine_password(const char *domain)
115 asprintf(&key, "%s/%s", SECRETS_MACHINE_PASSWORD, domain);
117 ret = (char *)secrets_fetch(key, NULL);
124 /*******************************************************************************
125 Lock the secrets tdb based on a string - this is used as a primitive form of mutex
126 between smbd instances.
127 *******************************************************************************/
129 BOOL secrets_named_mutex(const char *name, uint_t timeout, size_t *p_ref_count)
131 size_t ref_count = *p_ref_count;
138 if (ref_count == 0) {
139 ret = tdb_lock_bystring(tdb->tdb, name, timeout);
141 DEBUG(10,("secrets_named_mutex: got mutex for %s\n", name ));
145 *p_ref_count = ++ref_count;
146 DEBUG(10,("secrets_named_mutex: ref_count for mutex %s = %u\n", name, (uint_t)ref_count ));
151 /*******************************************************************************
152 Unlock a named mutex.
153 *******************************************************************************/
155 void secrets_named_mutex_release(const char *name, size_t *p_ref_count)
157 size_t ref_count = *p_ref_count;
159 SMB_ASSERT(ref_count != 0);
165 if (ref_count == 1) {
166 tdb_unlock_bystring(tdb->tdb, name);
167 DEBUG(10,("secrets_named_mutex: released mutex for %s\n", name ));
170 *p_ref_count = --ref_count;
171 DEBUG(10,("secrets_named_mutex_release: ref_count for mutex %s = %u\n", name, (uint_t)ref_count ));
175 connect to the schannel ldb
177 struct ldb_wrap *secrets_db_connect(TALLOC_CTX *mem_ctx)
180 struct ldb_wrap *ldb;
182 path = private_path(mem_ctx, "secrets.ldb");
187 ldb = ldb_wrap_connect(mem_ctx, path, 0, NULL);