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 3 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, see <http://www.gnu.org/licenses/>.
21 /* the Samba secrets database stores any generated, private information
22 such as the local SID and machine trust password */
26 #include "param/param.h"
27 #include "system/filesys.h"
29 #include "lib/ldb/include/ldb.h"
30 #include "../tdb/include/tdb.h"
31 #include "../lib/util/util_tdb.h"
32 #include "../lib/util/util_ldb.h"
33 #include "librpc/gen_ndr/ndr_security.h"
34 #include "dsdb/samdb/samdb.h"
35 #include "dsdb/common/util.h"
36 #include "dsdb/common/proto.h"
39 * Use a TDB to store an incrementing random seed.
41 * Initialised to the current pid, the very first time Samba starts,
42 * and incremented by one each time it is needed.
44 * @note Not called by systems with a working /dev/urandom.
46 static void get_rand_seed(struct tdb_wrap
*secretsdb
, int *new_seed
)
49 if (secretsdb
!= NULL
) {
50 tdb_change_int32_atomic(secretsdb
->tdb
, "INFO/random_seed", new_seed
, 1);
55 * open up the secrets database
57 struct tdb_wrap
*secrets_init(TALLOC_CTX
*mem_ctx
, struct loadparm_context
*lp_ctx
)
63 fname
= private_path(mem_ctx
, lp_ctx
, "secrets.tdb");
65 tdb
= tdb_wrap_open(mem_ctx
, fname
, 0, TDB_DEFAULT
, O_RDWR
|O_CREAT
, 0600);
68 DEBUG(0,("Failed to open %s\n", fname
));
75 * Set a reseed function for the crypto random generator
77 * This avoids a problem where systems without /dev/urandom
78 * could send the same challenge to multiple clients
80 set_rand_reseed_callback((void (*) (void *, int *))get_rand_seed
, tdb
);
82 /* Ensure that the reseed is done now, while we are root, etc */
83 generate_random_buffer(&dummy
, sizeof(dummy
));
89 connect to the secrets ldb
91 struct ldb_context
*secrets_db_connect(TALLOC_CTX
*mem_ctx
,
92 struct tevent_context
*ev_ctx
,
93 struct loadparm_context
*lp_ctx
)
97 struct ldb_context
*ldb
;
99 url
= lp_secrets_url(lp_ctx
);
100 if (!url
|| !url
[0]) {
104 path
= private_path(mem_ctx
, lp_ctx
, url
);
109 /* Secrets.ldb *must* always be local. If we call for a
110 * system_session() we will recurse */
111 ldb
= ldb_init(mem_ctx
, ev_ctx
);
117 ldb_set_modules_dir(ldb
,
118 talloc_asprintf(ldb
, "%s/ldb", lp_modulesdir(lp_ctx
)));
120 if (ldb_connect(ldb
, path
, 0, NULL
) != 0) {
125 /* the update_keytab module relies on this being setup */
126 if (ldb_set_opaque(ldb
, "loadparm", lp_ctx
) != LDB_SUCCESS
) {
138 * Retrieve the domain SID from the secrets database.
139 * @return pointer to a SID object if the SID could be obtained, NULL otherwise
141 struct dom_sid
*secrets_get_domain_sid(TALLOC_CTX
*mem_ctx
,
142 struct tevent_context
*ev_ctx
,
143 struct loadparm_context
*lp_ctx
,
147 struct ldb_context
*ldb
;
148 struct ldb_message
*msg
;
150 const char *attrs
[] = { "objectSid", NULL
};
151 struct dom_sid
*result
= NULL
;
152 const struct ldb_val
*v
;
153 enum ndr_err_code ndr_err
;
156 ldb
= secrets_db_connect(mem_ctx
, ev_ctx
, lp_ctx
);
158 DEBUG(5, ("secrets_db_connect failed\n"));
162 ldb_ret
= dsdb_search_one(ldb
, ldb
, &msg
,
163 ldb_dn_new(mem_ctx
, ldb
, SECRETS_PRIMARY_DOMAIN_DN
),
165 attrs
, 0, SECRETS_PRIMARY_DOMAIN_FILTER
, domain
);
167 if (ldb_ret
!= LDB_SUCCESS
) {
168 *errstring
= talloc_asprintf(mem_ctx
, "Failed to find record for %s in %s: %s: %s",
169 domain
, (char *) ldb_get_opaque(ldb
, "ldb_url"),
170 ldb_strerror(ldb_ret
), ldb_errstring(ldb
));
173 v
= ldb_msg_find_ldb_val(msg
, "objectSid");
175 *errstring
= talloc_asprintf(mem_ctx
, "Failed to find a SID on record for %s in %s",
176 domain
, (char *) ldb_get_opaque(ldb
, "ldb_url"));
179 result
= talloc(mem_ctx
, struct dom_sid
);
180 if (result
== NULL
) {
185 ndr_err
= ndr_pull_struct_blob(v
, result
, result
,
186 (ndr_pull_flags_fn_t
)ndr_pull_dom_sid
);
187 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err
)) {
188 *errstring
= talloc_asprintf(mem_ctx
, "Failed to parse SID on record for %s in %s",
189 domain
, (char *) ldb_get_opaque(ldb
, "ldb_url"));