1
0
mirror of https://github.com/samba-team/samba.git synced 2024-12-22 13:34:15 +03:00
samba-mirror/source4/param/secrets.c

186 lines
4.4 KiB
C
Raw Normal View History

/*
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 "tdb_wrap.h"
#include "ldb_wrap.h"
#include "lib/ldb/include/ldb.h"
#include "lib/tdb/include/tdb.h"
#include "lib/util/util_tdb.h"
#include "lib/util/util_ldb.h"
#include "dsdb/samdb/samdb.h"
static struct tdb_wrap *tdb;
/**
* 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(int *new_seed)
{
*new_seed = getpid();
if (tdb) {
tdb_change_int32_atomic(tdb->tdb, "INFO/random_seed", new_seed, 1);
}
}
/* close the secrets database */
void secrets_shutdown(void)
{
talloc_free(tdb);
}
/* open up the secrets database */
bool secrets_init(void)
{
char *fname;
uint8_t dummy;
if (tdb)
return true;
fname = private_path(talloc_autofree_context(), global_loadparm,
"secrets.tdb");
r5102: This is a major simplification of the logic for controlling top level servers in smbd. The old code still contained a fairly bit of legacy from the time when smbd was only handling SMB connection. The new code gets rid of all of the smb_server specific code in smbd/, and creates a much simpler infrastructures for new server code. Major changes include: - simplified the process model code a lot. - got rid of the top level server and service structures completely. The top level context is now the event_context. This got rid of service.h and server.h completely (they were the most confusing parts of the old code) - added service_stream.[ch] for the helper functions that are specific to stream type services (services that handle streams, and use a logically separate process per connection) - got rid of the builtin idle_handler code in the service logic, as none of the servers were using it, and it can easily be handled by a server in future by adding its own timed_event to the event context. - fixed some major memory leaks in the rpc server code. - added registration of servers, rather than hard coding our list of possible servers. This allows for servers as modules in the future. - temporarily disabled the winbind code until I add the helper functions for that type of server - added error checking on service startup. If a configured server fails to startup then smbd doesn't startup. - cleaned up the command line handling in smbd, removing unused options (This used to be commit cf6a46c3cbde7b1eb1b86bd3882b953a2de3a42e)
2005-01-30 03:54:57 +03:00
tdb = tdb_wrap_open(talloc_autofree_context(), fname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
if (!tdb) {
DEBUG(0,("Failed to open %s\n", fname));
SAFE_FREE(fname);
return false;
}
SAFE_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(get_rand_seed);
/* Ensure that the reseed is done now, while we are root, etc */
generate_random_buffer(&dummy, sizeof(dummy));
return true;
}
/*
connect to the schannel ldb
*/
struct ldb_context *secrets_db_connect(TALLOC_CTX *mem_ctx)
{
char *path;
const char *url;
struct ldb_context *ldb;
bool existed;
const char *init_ldif =
"dn: @ATTRIBUTES\n" \
"computerName: CASE_INSENSITIVE\n" \
"flatname: CASE_INSENSITIVE\n";
url = lp_secrets_url(global_loadparm);
if (!url || !url[0]) {
return NULL;
}
path = private_path(mem_ctx, global_loadparm, url);
if (!path) {
return NULL;
}
existed = file_exist(path);
/* Secrets.ldb *must* always be local. If we call for a
* system_session() we will recurse */
ldb = ldb_wrap_connect(mem_ctx, global_loadparm, path, NULL, NULL, 0, NULL);
talloc_free(path);
if (!ldb) {
return NULL;
}
if (!existed) {
gendb_add_ldif(ldb, init_ldif);
}
return ldb;
}
struct dom_sid *secrets_get_domain_sid(TALLOC_CTX *mem_ctx,
const char *domain)
{
struct ldb_context *ldb;
struct ldb_message **msgs;
int ldb_ret;
const char *attrs[] = { "objectSid", NULL };
struct dom_sid *result = NULL;
ldb = secrets_db_connect(mem_ctx);
if (ldb == NULL) {
DEBUG(5, ("secrets_db_connect failed\n"));
return NULL;
}
ldb_ret = gendb_search(ldb, ldb,
ldb_dn_new(mem_ctx, ldb, SECRETS_PRIMARY_DOMAIN_DN),
&msgs, attrs,
SECRETS_PRIMARY_DOMAIN_FILTER, domain);
if (ldb_ret == -1) {
DEBUG(5, ("Error searching for domain SID for %s: %s",
domain, ldb_errstring(ldb)));
talloc_free(ldb);
return NULL;
}
if (ldb_ret == 0) {
DEBUG(5, ("Did not find domain record for %s\n", domain));
talloc_free(ldb);
return NULL;
}
if (ldb_ret > 1) {
DEBUG(5, ("Found more than one (%d) domain records for %s\n",
ldb_ret, domain));
talloc_free(ldb);
return NULL;
}
result = samdb_result_dom_sid(mem_ctx, msgs[0], "objectSid");
if (result == NULL) {
DEBUG(0, ("Domain object for %s does not contain a SID!\n",
domain));
talloc_free(ldb);
return NULL;
}
return result;
}