mirror of
https://github.com/samba-team/samba.git
synced 2024-12-23 17:34:34 +03:00
ce4531ee31
It's a bit confusing to mix low-level and high-level libraries. We had multiple libraries in one directory, and there were have circular dependencies with other libraries outside that directory (in this case, samba-hostconfig). Autobuild-User: Jelmer Vernooij <jelmer@samba.org> Autobuild-Date: Sat Mar 10 23:13:01 CET 2012 on sn-devel-104
193 lines
5.5 KiB
C
193 lines
5.5 KiB
C
/*
|
|
Unix SMB/CIFS implementation.
|
|
Copyright (C) Andrew Tridgell 1992-2001
|
|
Copyright (C) Andrew Bartlett 2002
|
|
Copyright (C) Rafal Szczesniak 2002
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/* the Samba secrets database stores any generated, private information
|
|
such as the local SID and machine trust password */
|
|
|
|
#include "includes.h"
|
|
#include "secrets.h"
|
|
#include "param/param.h"
|
|
#include "system/filesys.h"
|
|
#include "lib/tdb_wrap/tdb_wrap.h"
|
|
#include "lib/ldb-samba/ldb_wrap.h"
|
|
#include <ldb.h>
|
|
#include "../lib/util/util_tdb.h"
|
|
#include "librpc/gen_ndr/ndr_security.h"
|
|
#include "dsdb/samdb/samdb.h"
|
|
|
|
/**
|
|
* Use a TDB to store an incrementing random seed.
|
|
*
|
|
* Initialised to the current pid, the very first time Samba starts,
|
|
* and incremented by one each time it is needed.
|
|
*
|
|
* @note Not called by systems with a working /dev/urandom.
|
|
*/
|
|
static void get_rand_seed(struct tdb_wrap *secretsdb, int *new_seed)
|
|
{
|
|
*new_seed = getpid();
|
|
if (secretsdb != NULL) {
|
|
tdb_change_int32_atomic(secretsdb->tdb, "INFO/random_seed", new_seed, 1);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* open up the randseed database and set the random number generator callback
|
|
*/
|
|
bool randseed_init(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx)
|
|
{
|
|
char *fname;
|
|
uint8_t dummy;
|
|
struct tdb_wrap *tdb;
|
|
|
|
fname = lpcfg_private_path(mem_ctx, lp_ctx, "randseed.tdb");
|
|
|
|
tdb = tdb_wrap_open(mem_ctx, fname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600, lp_ctx);
|
|
|
|
if (!tdb) {
|
|
DEBUG(0,("Failed to open %s\n", fname));
|
|
talloc_free(fname);
|
|
return false;
|
|
}
|
|
talloc_free(fname);
|
|
|
|
/**
|
|
* Set a reseed function for the crypto random generator
|
|
*
|
|
* This avoids a problem where systems without /dev/urandom
|
|
* could send the same challenge to multiple clients
|
|
*/
|
|
set_rand_reseed_callback((void (*) (void *, int *))get_rand_seed, tdb);
|
|
|
|
/* Ensure that the reseed is done now, while we are root, etc */
|
|
generate_random_buffer(&dummy, sizeof(dummy));
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
connect to the secrets ldb
|
|
*/
|
|
struct ldb_context *secrets_db_connect(TALLOC_CTX *mem_ctx,
|
|
struct loadparm_context *lp_ctx)
|
|
{
|
|
return ldb_wrap_connect(mem_ctx, NULL, lp_ctx, "secrets.ldb",
|
|
NULL, NULL, 0);
|
|
}
|
|
|
|
/**
|
|
* Retrieve the domain SID from the secrets database.
|
|
* @return pointer to a SID object if the SID could be obtained, NULL otherwise
|
|
*/
|
|
struct dom_sid *secrets_get_domain_sid(TALLOC_CTX *mem_ctx,
|
|
struct loadparm_context *lp_ctx,
|
|
const char *domain,
|
|
enum netr_SchannelType *sec_channel_type,
|
|
char **errstring)
|
|
{
|
|
struct ldb_context *ldb;
|
|
struct ldb_message *msg;
|
|
int ldb_ret;
|
|
const char *attrs[] = { "objectSid", "secureChannelType", NULL };
|
|
struct dom_sid *result = NULL;
|
|
const struct ldb_val *v;
|
|
enum ndr_err_code ndr_err;
|
|
|
|
*errstring = NULL;
|
|
|
|
ldb = secrets_db_connect(mem_ctx, lp_ctx);
|
|
if (ldb == NULL) {
|
|
DEBUG(5, ("secrets_db_connect failed\n"));
|
|
return NULL;
|
|
}
|
|
|
|
ldb_ret = dsdb_search_one(ldb, ldb, &msg,
|
|
ldb_dn_new(mem_ctx, ldb, SECRETS_PRIMARY_DOMAIN_DN),
|
|
LDB_SCOPE_ONELEVEL,
|
|
attrs, 0, SECRETS_PRIMARY_DOMAIN_FILTER, domain);
|
|
|
|
if (ldb_ret != LDB_SUCCESS) {
|
|
*errstring = talloc_asprintf(mem_ctx, "Failed to find record for %s in %s: %s: %s",
|
|
domain, (char *) ldb_get_opaque(ldb, "ldb_url"),
|
|
ldb_strerror(ldb_ret), ldb_errstring(ldb));
|
|
return NULL;
|
|
}
|
|
v = ldb_msg_find_ldb_val(msg, "objectSid");
|
|
if (v == NULL) {
|
|
*errstring = talloc_asprintf(mem_ctx, "Failed to find a SID on record for %s in %s",
|
|
domain, (char *) ldb_get_opaque(ldb, "ldb_url"));
|
|
return NULL;
|
|
}
|
|
|
|
if (sec_channel_type) {
|
|
int t;
|
|
t = ldb_msg_find_attr_as_int(msg, "secureChannelType", -1);
|
|
if (t == -1) {
|
|
*errstring = talloc_asprintf(mem_ctx, "Failed to find secureChannelType for %s in %s",
|
|
domain, (char *) ldb_get_opaque(ldb, "ldb_url"));
|
|
return NULL;
|
|
}
|
|
*sec_channel_type = t;
|
|
}
|
|
|
|
result = talloc(mem_ctx, struct dom_sid);
|
|
if (result == NULL) {
|
|
talloc_free(ldb);
|
|
return NULL;
|
|
}
|
|
|
|
ndr_err = ndr_pull_struct_blob(v, result, result,
|
|
(ndr_pull_flags_fn_t)ndr_pull_dom_sid);
|
|
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
|
|
*errstring = talloc_asprintf(mem_ctx, "Failed to parse SID on record for %s in %s",
|
|
domain, (char *) ldb_get_opaque(ldb, "ldb_url"));
|
|
talloc_free(result);
|
|
talloc_free(ldb);
|
|
return NULL;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
char *keytab_name_from_msg(TALLOC_CTX *mem_ctx, struct ldb_context *ldb, struct ldb_message *msg)
|
|
{
|
|
const char *krb5keytab = ldb_msg_find_attr_as_string(msg, "krb5Keytab", NULL);
|
|
if (krb5keytab) {
|
|
return talloc_strdup(mem_ctx, krb5keytab);
|
|
} else {
|
|
char *file_keytab;
|
|
char *relative_path;
|
|
const char *privateKeytab = ldb_msg_find_attr_as_string(msg, "privateKeytab", NULL);
|
|
if (!privateKeytab) {
|
|
return NULL;
|
|
}
|
|
|
|
relative_path = ldb_relative_path(ldb, mem_ctx, privateKeytab);
|
|
if (!relative_path) {
|
|
return NULL;
|
|
}
|
|
file_keytab = talloc_asprintf(mem_ctx, "FILE:%s", relative_path);
|
|
talloc_free(relative_path);
|
|
return file_keytab;
|
|
}
|
|
return NULL;
|
|
}
|
|
|