machine_sid.c   [plain text]

/* 
   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

   Copyright (C) 2008 Apple Inc. All rights reserved.
      
   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"
#include "opendirectory.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 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, DOM_SID *sid)
{
	char **lines;
	int numlines;
	BOOL ret;

	lines = file_lines_load(fname, &numlines,0);
	
	if (!lines || numlines < 1) {
		if (lines) file_lines_free(lines);
		return False;
	}
	
	ret = string_to_sid(sid, lines[0]);
	file_lines_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(DOM_SID *sid)
{
	int i;
	uchar raw_sid_data[12];

	memset((char *)sid, '\0', sizeof(*sid));
	sid->sid_rev_num = 1;
	sid->id_auth[5] = 5;
	sid->num_auths = 0;
	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 DOM_SID *pdb_generate_sam_sid(void)
{
	DOM_SID domain_sid;
	char *fname = NULL;
	DOM_SID *sam_sid;
	
	if(!(sam_sid=SMB_MALLOC_P(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(global_myname(), 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 (!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(global_myname(), &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 */
	asprintf(&fname, "%s/MACHINE.SID", lp_private_dir());

	if (read_sid_from_file(fname, sam_sid)) {
		/* remember it for future reference and unlink the old MACHINE.SID */
		if (!secrets_store_domain_sid(global_myname(), 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(global_myname(), 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;
}   

static DOM_SID * opendirectory_sam_sid(void)
{
	DOM_SID * sam_sid;
	tDirStatus status;

	if(!(sam_sid = SMB_MALLOC_P(DOM_SID))) {
		return NULL;
	}

	if (!IS_DC) {
		status = opendirectory_query_machine_sid(NULL, sam_sid);
		LOG_DS_ERROR(DS_TRACE_ERRORS, status,
			"opendirectory_query_machine_sid");

	} else {
		status = opendirectory_query_domain_sid(NULL,
				lp_workgroup(), sam_sid);
		LOG_DS_ERROR(DS_TRACE_ERRORS, status,
			"opendirectory_query_domain_sid");
	}

	if (status != eDSNoErr) {
		SAFE_FREE(sam_sid);
		return NULL;
	}

	return sam_sid;
}

/* return our global_sam_sid */
DOM_SID *get_global_sam_sid(void)
{
	if (global_sam_sid != NULL)
		return global_sam_sid;
	
	/* memory for global_sam_sid is allocated in 
	   pdb_generate_sam_sid() as needed */

	if (lp_opendirectory()) {
		if (!(global_sam_sid = opendirectory_sam_sid())) {
			DEBUG(0, ("Could not generate a machine SID\n"));
			exit(1);
		}

		return global_sam_sid;
	}

	if (!(global_sam_sid = pdb_generate_sam_sid())) {
		DEBUG(0, ("Could not generate a machine SID\n"));
		exit(1);
	}

	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 domain SID (S-1-5-21-x-y-z).
*****************************************************************/  

BOOL sid_check_is_domain(const DOM_SID *sid)
{
	const DOM_SID apple_wellknown =
	    { 1, 1, {0,0,0,0,0,5}, {21,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};


	const DOM_SID apple_compat =
	    { 1, 4, {0,0,0,0,0,5},
		{21,987654321,987654321,987654321,0,0,0,0,0,0,0,0,0,0,0}};

	return sid_equal(sid, get_global_sam_sid()) ||
		sid_equal(sid, &apple_compat) ||
		sid_equal(sid, &apple_wellknown);
}

/*****************************************************************
 Check if the SID is our domain SID (S-1-5-21-x-y-z).
*****************************************************************/  

BOOL sid_check_is_in_our_domain(const DOM_SID *sid)
{
	DOM_SID dom_sid;
	uint32 rid;

	sid_copy(&dom_sid, sid);
	sid_split_rid(&dom_sid, &rid);
	
	return sid_check_is_domain(&dom_sid);
}