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0b5c4a601a
Autobuild-User: Michael Adam <obnox@samba.org> Autobuild-Date: Fri Jul 29 13:34:22 CEST 2011 on sn-devel-104
252 lines
6.6 KiB
C
252 lines
6.6 KiB
C
/*
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Unix SMB/CIFS implementation.
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Password and authentication handling
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Copyright (C) Jeremy Allison 1996-2002
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Copyright (C) Andrew Tridgell 2002
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Copyright (C) Gerald (Jerry) Carter 2000
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Copyright (C) Stefan (metze) Metzmacher 2002
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "passdb.h"
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#include "secrets.h"
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#include "dbwrap/dbwrap.h"
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#include "../libcli/security/security.h"
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/* NOTE! the global_sam_sid is the SID of our local SAM. This is only
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equal to the domain SID when we are a DC, otherwise its our
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workstation SID */
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static struct dom_sid *global_sam_sid=NULL;
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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_PASSDB
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/****************************************************************************
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Read a SID from a file. This is for compatibility with the old MACHINE.SID
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style of SID storage
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****************************************************************************/
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static bool read_sid_from_file(const char *fname, struct dom_sid *sid)
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{
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char **lines;
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int numlines;
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bool ret;
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lines = file_lines_load(fname, &numlines,0, NULL);
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if (!lines || numlines < 1) {
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TALLOC_FREE(lines);
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return False;
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}
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ret = string_to_sid(sid, lines[0]);
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TALLOC_FREE(lines);
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return ret;
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}
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/*
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generate a random sid - used to build our own sid if we don't have one
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*/
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static void generate_random_sid(struct dom_sid *sid)
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{
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int i;
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uchar raw_sid_data[12];
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ZERO_STRUCTP(sid);
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sid->sid_rev_num = 1;
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sid->id_auth[5] = 5;
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sid->num_auths = 0;
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sid->sub_auths[sid->num_auths++] = 21;
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generate_random_buffer(raw_sid_data, 12);
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for (i = 0; i < 3; i++)
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sid->sub_auths[sid->num_auths++] = IVAL(raw_sid_data, i*4);
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}
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/****************************************************************************
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Generate the global machine sid.
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****************************************************************************/
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static struct dom_sid *pdb_generate_sam_sid(void)
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{
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struct dom_sid domain_sid;
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char *fname = NULL;
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struct dom_sid *sam_sid;
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if(!(sam_sid=SMB_MALLOC_P(struct dom_sid)))
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return NULL;
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if ( IS_DC ) {
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if (secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
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sid_copy(sam_sid, &domain_sid);
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return sam_sid;
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}
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}
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if (secrets_fetch_domain_sid(lp_netbios_name(), sam_sid)) {
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/* We got our sid. If not a pdc/bdc, we're done. */
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if ( !IS_DC )
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return sam_sid;
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if (!secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
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/* No domain sid and we're a pdc/bdc. Store it */
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if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
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DEBUG(0,("pdb_generate_sam_sid: Can't store domain SID as a pdc/bdc.\n"));
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SAFE_FREE(sam_sid);
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return NULL;
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}
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return sam_sid;
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}
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if (!dom_sid_equal(&domain_sid, sam_sid)) {
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/* Domain name sid doesn't match global sam sid. Re-store domain sid as 'local' sid. */
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DEBUG(0,("pdb_generate_sam_sid: Mismatched SIDs as a pdc/bdc.\n"));
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if (!secrets_store_domain_sid(lp_netbios_name(), &domain_sid)) {
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DEBUG(0,("pdb_generate_sam_sid: Can't re-store domain SID for local sid as PDC/BDC.\n"));
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SAFE_FREE(sam_sid);
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return NULL;
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}
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return sam_sid;
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}
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return sam_sid;
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}
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/* check for an old MACHINE.SID file for backwards compatibility */
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if (asprintf(&fname, "%s/MACHINE.SID", lp_private_dir()) == -1) {
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SAFE_FREE(sam_sid);
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return NULL;
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}
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if (read_sid_from_file(fname, sam_sid)) {
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/* remember it for future reference and unlink the old MACHINE.SID */
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if (!secrets_store_domain_sid(lp_netbios_name(), sam_sid)) {
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DEBUG(0,("pdb_generate_sam_sid: Failed to store SID from file.\n"));
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SAFE_FREE(fname);
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SAFE_FREE(sam_sid);
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return NULL;
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}
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unlink(fname);
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if ( !IS_DC ) {
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if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
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DEBUG(0,("pdb_generate_sam_sid: Failed to store domain SID from file.\n"));
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SAFE_FREE(fname);
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SAFE_FREE(sam_sid);
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return NULL;
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}
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}
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/* Stored the old sid from MACHINE.SID successfully.*/
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SAFE_FREE(fname);
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return sam_sid;
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}
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SAFE_FREE(fname);
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/* we don't have the SID in secrets.tdb, we will need to
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generate one and save it */
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generate_random_sid(sam_sid);
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if (!secrets_store_domain_sid(lp_netbios_name(), sam_sid)) {
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DEBUG(0,("pdb_generate_sam_sid: Failed to store generated machine SID.\n"));
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SAFE_FREE(sam_sid);
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return NULL;
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}
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if ( IS_DC ) {
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if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) {
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DEBUG(0,("pdb_generate_sam_sid: Failed to store generated domain SID.\n"));
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SAFE_FREE(sam_sid);
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return NULL;
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}
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}
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return sam_sid;
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}
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/* return our global_sam_sid */
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struct dom_sid *get_global_sam_sid(void)
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{
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struct db_context *db;
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if (global_sam_sid != NULL)
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return global_sam_sid;
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/*
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* memory for global_sam_sid is allocated in
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* pdb_generate_sam_sid() as needed
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*
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* Note: this is garded by a transaction
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* to prevent races on startup which
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* can happen with some dbwrap backends
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*/
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db = secrets_db_ctx();
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if (!db) {
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smb_panic("could not open secrets db");
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}
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if (db->transaction_start(db) != 0) {
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smb_panic("could not start transaction on secrets db");
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}
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if (!(global_sam_sid = pdb_generate_sam_sid())) {
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db->transaction_cancel(db);
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smb_panic("could not generate a machine SID");
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}
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if (db->transaction_commit(db) != 0) {
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smb_panic("could not start commit secrets db");
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}
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return global_sam_sid;
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}
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/**
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* Force get_global_sam_sid to requery the backends
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*/
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void reset_global_sam_sid(void)
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{
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SAFE_FREE(global_sam_sid);
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}
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/*****************************************************************
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Check if the SID is our domain SID (S-1-5-21-x-y-z).
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*****************************************************************/
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bool sid_check_is_domain(const struct dom_sid *sid)
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{
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return dom_sid_equal(sid, get_global_sam_sid());
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}
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/*****************************************************************
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Check if the SID is our domain SID (S-1-5-21-x-y-z).
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*****************************************************************/
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bool sid_check_is_in_our_domain(const struct dom_sid *sid)
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{
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struct dom_sid dom_sid;
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sid_copy(&dom_sid, sid);
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sid_split_rid(&dom_sid, NULL);
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return sid_check_is_domain(&dom_sid);
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}
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