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/*
Unix SMB/CIFS implementation.
Password and authentication handling
Copyright (C) Jeremy Allison 1996-2002
Copyright (C) Andrew Tridgell 2002
Copyright (C) Gerald (Jerry) Carter 2000
Copyright (C) Stefan (metze) Metzmacher 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/>.
*/
#include "includes.h"
#include "passdb/machine_sid.h"
#include "secrets.h"
#include "dbwrap/dbwrap.h"
#include "../libcli/security/security.h"
/* NOTE! the global_sam_sid is the SID of our local SAM. This is only
equal to the domain SID when we are a DC, otherwise its our
workstation SID */
static struct dom_sid *global_sam_sid=NULL;
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_PASSDB
/****************************************************************************
Read a SID from a file. This is for compatibility with the old MACHINE.SID
style of SID storage
****************************************************************************/
static bool read_sid_from_file(const char *fname, struct dom_sid *sid)
{
char **lines;
int numlines;
bool ret;
lines = file_lines_load(fname, &numlines,0, NULL);
if (!lines || numlines < 1) {
TALLOC_FREE(lines);
return False;
}
ret = string_to_sid(sid, lines[0]);
TALLOC_FREE(lines);
return ret;
}
/*
generate a random sid - used to build our own sid if we don't have one
*/
static void generate_random_sid(struct dom_sid *sid)
{
int i;
uchar raw_sid_data[12];
*sid = (struct dom_sid) {
.sid_rev_num = 1,
.id_auth[5] = 5,
};
sid->sub_auths[sid->num_auths++] = 21;
generate_random_buffer(raw_sid_data, 12);
for (i = 0; i < 3; i++)
sid->sub_auths[sid->num_auths++] = IVAL(raw_sid_data, i*4);
}
/****************************************************************************
Generate the global machine sid.
****************************************************************************/
static struct dom_sid *pdb_generate_sam_sid(void)
{
struct dom_sid domain_sid;
char *fname = NULL;
struct dom_sid *sam_sid;
if(!(sam_sid=SMB_MALLOC_P(struct dom_sid)))
return NULL;
if ( IS_DC ) {
if (secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
sid_copy(sam_sid, &domain_sid);
return sam_sid;
}
}
if (secrets_fetch_domain_sid(lp_netbios_name(), sam_sid)) {
/* We got our sid. If not a pdc/bdc, we're done. */
if ( !IS_DC )
return sam_sid;
if (!secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
/* No domain sid and we're a pdc/bdc. Store it */
if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
DEBUG(0,("pdb_generate_sam_sid: Can't store domain SID as a pdc/bdc.\n"));
SAFE_FREE(sam_sid);
return NULL;
}
return sam_sid;
}
if (!dom_sid_equal(&domain_sid, sam_sid)) {
/* Domain name sid doesn't match global sam sid. Re-store domain sid as 'local' sid. */
DEBUG(0,("pdb_generate_sam_sid: Mismatched SIDs as a pdc/bdc.\n"));
if (!secrets_store_domain_sid(lp_netbios_name(), &domain_sid)) {
DEBUG(0,("pdb_generate_sam_sid: Can't re-store domain SID for local sid as PDC/BDC.\n"));
SAFE_FREE(sam_sid);
return NULL;
}
return sam_sid;
}
return sam_sid;
}
/* check for an old MACHINE.SID file for backwards compatibility */
if (asprintf(&fname, "%s/MACHINE.SID", lp_private_dir()) == -1) {
SAFE_FREE(sam_sid);
return NULL;
}
if (read_sid_from_file(fname, sam_sid)) {
/* remember it for future reference and unlink the old MACHINE.SID */
if (!secrets_store_domain_sid(lp_netbios_name(), sam_sid)) {
DEBUG(0,("pdb_generate_sam_sid: Failed to store SID from file.\n"));
SAFE_FREE(fname);
SAFE_FREE(sam_sid);
return NULL;
}
unlink(fname);
if ( !IS_DC ) {
if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
DEBUG(0,("pdb_generate_sam_sid: Failed to store domain SID from file.\n"));
SAFE_FREE(fname);
SAFE_FREE(sam_sid);
return NULL;
}
}
/* Stored the old sid from MACHINE.SID successfully.*/
SAFE_FREE(fname);
return sam_sid;
}
SAFE_FREE(fname);
/* we don't have the SID in secrets.tdb, we will need to
generate one and save it */
generate_random_sid(sam_sid);
if (!secrets_store_domain_sid(lp_netbios_name(), sam_sid)) {
DEBUG(0,("pdb_generate_sam_sid: Failed to store generated machine SID.\n"));
SAFE_FREE(sam_sid);
return NULL;
}
if ( IS_DC ) {
if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
DEBUG(0,("pdb_generate_sam_sid: Failed to store generated domain SID.\n"));
SAFE_FREE(sam_sid);
return NULL;
}
}
return sam_sid;
}
/* return our global_sam_sid */
struct dom_sid *get_global_sam_sid(void)
{
struct db_context *db;
if (global_sam_sid != NULL)
return global_sam_sid;
/*
* memory for global_sam_sid is allocated in
* pdb_generate_sam_sid() as needed
*
* Note: this is guarded by a transaction
* to prevent races on startup which
* can happen with some dbwrap backends
*/
db = secrets_db_ctx();
if (!db) {
smb_panic("could not open secrets db");
}
if (dbwrap_transaction_start(db) != 0) {
smb_panic("could not start transaction on secrets db");
}
if (!(global_sam_sid = pdb_generate_sam_sid())) {
dbwrap_transaction_cancel(db);
smb_panic("could not generate a machine SID");
}
if (dbwrap_transaction_commit(db) != 0) {
smb_panic("could not start commit secrets db");
}
return global_sam_sid;
}
/**
* Force get_global_sam_sid to requery the backends
*/
void reset_global_sam_sid(void)
{
SAFE_FREE(global_sam_sid);
}
/*****************************************************************
Check if the SID is our sam SID (S-1-5-21-x-y-z).
*****************************************************************/
bool sid_check_is_our_sam(const struct dom_sid *sid)
{
return dom_sid_equal(sid, get_global_sam_sid());
}
/*****************************************************************
Check if the SID is our domain SID (S-1-5-21-x-y-z).
*****************************************************************/
bool sid_check_is_in_our_sam(const struct dom_sid *sid)
{
struct dom_sid dom_sid;
sid_copy(&dom_sid, sid);
sid_split_rid(&dom_sid, NULL);
return sid_check_is_our_sam(&dom_sid);
}
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