path: root/source3/groupdb/mapping.c

/* 
 *  Unix SMB/Netbios implementation.
 *  Version 1.9.
 *  RPC Pipe client / server routines
 *  Copyright (C) Andrew Tridgell              1992-2000,
 *  Copyright (C) Jean François Micouleau      1998-2001.
 *  
 *  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"

extern DOM_SID global_sam_sid;

static TDB_CONTEXT *tdb; /* used for driver files */

#define DATABASE_VERSION 1
#define GROUP_PREFIX "UNIXGROUP/"

PRIVS privs[] = {
	{SE_PRIV_NONE,           "no_privs",                  "No privilege"                    }, /* this one MUST be first */
	{SE_PRIV_ADD_MACHINES,   "SeMachineAccountPrivilege", "Add workstations to the domain"  },
	{SE_PRIV_SEC_PRIV,       "SeSecurityPrivilege",       "Manage the audit logs"           },
	{SE_PRIV_TAKE_OWNER,     "SeTakeOwnershipPrivilege",  "Take ownership of file"          },
	{SE_PRIV_ADD_USERS,      "SaAddUsers",                "Add users to the domain - Samba" },
	{SE_PRIV_PRINT_OPERATOR, "SaPrintOp",                 "Add or remove printers - Samba"  },
	{SE_PRIV_ALL,            "SaAllPrivs",                "all privileges"                  }
};
/*
PRIVS privs[] = {
	{  2, "SeCreateTokenPrivilege" },
	{  3, "SeAssignPrimaryTokenPrivilege" },
	{  4, "SeLockMemoryPrivilege" },
	{  5, "SeIncreaseQuotaPrivilege" },
	{  6, "SeMachineAccountPrivilege" },
	{  7, "SeTcbPrivilege" },
	{  8, "SeSecurityPrivilege" },
	{  9, "SeTakeOwnershipPrivilege" },
	{ 10, "SeLoadDriverPrivilege" },
	{ 11, "SeSystemProfilePrivilege" },
	{ 12, "SeSystemtimePrivilege" },
	{ 13, "SeProfileSingleProcessPrivilege" },
	{ 14, "SeIncreaseBasePriorityPrivilege" },
	{ 15, "SeCreatePagefilePrivilege" },
	{ 16, "SeCreatePermanentPrivilege" },
	{ 17, "SeBackupPrivilege" },
	{ 18, "SeRestorePrivilege" },
	{ 19, "SeShutdownPrivilege" },
	{ 20, "SeDebugPrivilege" },
	{ 21, "SeAuditPrivilege" },
	{ 22, "SeSystemEnvironmentPrivilege" },
	{ 23, "SeChangeNotifyPrivilege" },
	{ 24, "SeRemoteShutdownPrivilege" },
	{ 25, "SeUndockPrivilege" },
	{ 26, "SeSyncAgentPrivilege" },
	{ 27, "SeEnableDelegationPrivilege" },
SeNetworkLogonRight
SeUnsolicitedInputPrivilege
SeBatchLogonRight
SeServiceLogonRight
SeInteractiveLogonRight
SeDenyInteractiveLogonRight
SeDenyNetworkLogonRight
SeDenyBatchLogonRight
SeDenyBatchLogonRight

};
*/

#if 0
/****************************************************************************
check if the user has the required privilege.
****************************************************************************/
static BOOL se_priv_access_check(NT_USER_TOKEN *token, uint32 privilege)
{
	/* no token, no privilege */
	if (token==NULL)
		return False;
	
	if ((token->privilege & privilege)==privilege)
		return True;
	
	return False;
}
#endif

/****************************************************************************
dump the mapping group mapping to a text file
****************************************************************************/
char *decode_sid_name_use(fstring group, enum SID_NAME_USE name_use)
{	
	static fstring group_type;

	switch(name_use) {
		case SID_NAME_USER:
			fstrcpy(group_type,"User");
			break;
		case SID_NAME_DOM_GRP:
			fstrcpy(group_type,"Domain group");
			break;
		case SID_NAME_DOMAIN:
			fstrcpy(group_type,"Domain");
			break;
		case SID_NAME_ALIAS:
			fstrcpy(group_type,"Local group");
			break;
		case SID_NAME_WKN_GRP:
			fstrcpy(group_type,"Builtin group");
			break;
		case SID_NAME_DELETED:
			fstrcpy(group_type,"Deleted");
			break;
		case SID_NAME_INVALID:
			fstrcpy(group_type,"Invalid");
			break;
		case SID_NAME_UNKNOWN:
		default:
			fstrcpy(group_type,"Unknown type");
			break;
	}
	
	fstrcpy(group, group_type);
	return group_type;
}

/****************************************************************************
open the group mapping tdb
****************************************************************************/
BOOL init_group_mapping(void)
{
	static pid_t local_pid;
	char *vstring = "INFO/version";

	if (tdb && local_pid == sys_getpid()) return True;
	tdb = tdb_open_log(lock_path("group_mapping.tdb"), 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
	if (!tdb) {
		DEBUG(0,("Failed to open group mapping database\n"));
		return False;
	}

	local_pid = sys_getpid();

	/* handle a Samba upgrade */
	tdb_lock_bystring(tdb, vstring);
	if (tdb_fetch_int(tdb, vstring) != DATABASE_VERSION) {
		tdb_traverse(tdb, (tdb_traverse_func)tdb_delete, NULL);
		tdb_store_int(tdb, vstring, DATABASE_VERSION);
	}
	tdb_unlock_bystring(tdb, vstring);


	return True;
}

/****************************************************************************
****************************************************************************/
BOOL add_mapping_entry(GROUP_MAP *map, int flag)
{
	TDB_DATA kbuf, dbuf;
	pstring key, buf;
	fstring string_sid="";
	int len;
	int i;
	
	sid_to_string(string_sid, &map->sid);

	len = tdb_pack(buf, sizeof(buf), "ddff",
			map->gid, map->sid_name_use, map->nt_name, map->comment);

	for (i=0; i<PRIV_ALL_INDEX; i++)
		len += tdb_pack(buf+len, sizeof(buf)-len, "d", map->privileges[i]);

	if (len > sizeof(buf)) return False;

	slprintf(key, sizeof(key), "%s%s", GROUP_PREFIX, string_sid);

	kbuf.dsize = strlen(key)+1;
	kbuf.dptr = key;
	dbuf.dsize = len;
	dbuf.dptr = buf;
	if (tdb_store(tdb, kbuf, dbuf, flag) != 0) return False;

	return True;
}

/****************************************************************************
initialise first time the mapping list
****************************************************************************/
BOOL add_initial_entry(gid_t gid, fstring sid, enum SID_NAME_USE sid_name_use,
			      fstring nt_name, fstring comment, uint32 *privilege)
{
	GROUP_MAP map;
	int i;

	map.gid=gid;
	string_to_sid(&map.sid, sid);
	map.sid_name_use=sid_name_use;
	fstrcpy(map.nt_name, nt_name);
	fstrcpy(map.comment, comment);
	for (i=0; i<PRIV_ALL_INDEX; i++)
		map.privileges[i]=privilege[i];

	add_mapping_entry(&map, TDB_INSERT);

	return True;
}

/****************************************************************************
initialise a privilege list
****************************************************************************/
void init_privilege(uint32 *privilege)
{
	int i;

	for (i=0; i<PRIV_ALL_INDEX; i++)
		privilege[i]=0;
}

/****************************************************************************
add a privilege to a privilege array
****************************************************************************/
BOOL add_privilege(uint32 *privilege, uint32 priv)
{
	int i=0;

	while (i<PRIV_ALL_INDEX && privilege[i]!=0 && privilege[i]!=priv)
		i++;

	if (i==PRIV_ALL_INDEX) {
		DEBUG(10,("add_privilege: the privilege array is full, can't add new priv\n"));
		return False;
	}

	if (privilege[i]==priv) {
		DEBUG(10,("add_privilege: privilege already in array\n"));
		return False;
	}

	if (privilege[i]==0)
		privilege[i]=priv;
	
	return True;	
}

/****************************************************************************
add all the privileges to a privilege array
****************************************************************************/
BOOL add_all_privilege(uint32 *privilege)
{
	add_privilege(privilege, SE_PRIV_ADD_USERS);
	add_privilege(privilege, SE_PRIV_ADD_MACHINES);
	add_privilege(privilege, SE_PRIV_PRINT_OPERATOR);
	return True;
}

/****************************************************************************
check if the privilege list is empty
****************************************************************************/
BOOL check_empty_privilege(uint32 *privilege)
{
	int i;

	for (i=0; i<PRIV_ALL_INDEX; i++)
		if(privilege[i]!=0)
			return False;
	return True;
}

/****************************************************************************
check if the privilege is in the privilege list
****************************************************************************/
BOOL check_priv_in_privilege(uint32 *privilege, uint32 priv)
{
	int i;

	for (i=0; i<PRIV_ALL_INDEX; i++)
		if(privilege[i]==priv)
			return True;
	return False;
}

/****************************************************************************
initialise first time the mapping list
****************************************************************************/
BOOL default_group_mapping(void)
{
	DOM_SID sid_admins;
	DOM_SID sid_users;
	DOM_SID sid_guests;
	fstring str_admins;
	fstring str_users;
	fstring str_guests;

	uint32 privilege_none[PRIV_ALL_INDEX];
	uint32 privilege_all[PRIV_ALL_INDEX];
	uint32 privilege_print_op[PRIV_ALL_INDEX];

	init_privilege(privilege_none);
	init_privilege(privilege_all);
	init_privilege(privilege_print_op);

	add_privilege(privilege_print_op, SE_PRIV_PRINT_OPERATOR);

	add_all_privilege(privilege_all);

	/* Add the Wellknown groups */

	add_initial_entry(-1, "S-1-5-32-544", SID_NAME_WKN_GRP, "Administrators", "", privilege_all);
	add_initial_entry(-1, "S-1-5-32-545", SID_NAME_WKN_GRP, "Users", "", privilege_none);
	add_initial_entry(-1, "S-1-5-32-546", SID_NAME_WKN_GRP, "Guests", "", privilege_none);
	add_initial_entry(-1, "S-1-5-32-547", SID_NAME_WKN_GRP, "Power Users", "", privilege_none);

	add_initial_entry(-1, "S-1-5-32-548", SID_NAME_WKN_GRP, "Account Operators", "", privilege_none);
	add_initial_entry(-1, "S-1-5-32-549", SID_NAME_WKN_GRP, "System Operators", "", privilege_none);
	add_initial_entry(-1, "S-1-5-32-550", SID_NAME_WKN_GRP, "Print Operators", "", privilege_print_op);
	add_initial_entry(-1, "S-1-5-32-551", SID_NAME_WKN_GRP, "Backup Operators", "", privilege_none);

	add_initial_entry(-1, "S-1-5-32-552", SID_NAME_WKN_GRP, "Replicators", "", privilege_none);

	/* Add the defaults domain groups */

	sid_copy(&sid_admins, &global_sam_sid);
	sid_append_rid(&sid_admins, DOMAIN_GROUP_RID_ADMINS);
	sid_to_string(str_admins, &sid_admins);
	add_initial_entry(-1, str_admins, SID_NAME_DOM_GRP, "Domain Admins", "", privilege_all);

	sid_copy(&sid_users,  &global_sam_sid);
	sid_append_rid(&sid_users,  DOMAIN_GROUP_RID_USERS);
	sid_to_string(str_users, &sid_users);
	add_initial_entry(-1, str_users,  SID_NAME_DOM_GRP, "Domain Users",  "", privilege_none);

	sid_copy(&sid_guests, &global_sam_sid);
	sid_append_rid(&sid_guests, DOMAIN_GROUP_RID_GUESTS);
	sid_to_string(str_guests, &sid_guests);
	add_initial_entry(-1, str_guests, SID_NAME_DOM_GRP, "Domain Guests", "", privilege_none);

	return True;
}


/****************************************************************************
return the sid and the type of the unix group
****************************************************************************/
BOOL get_group_map_from_sid(DOM_SID sid, GROUP_MAP *map)
{
	TDB_DATA kbuf, dbuf;
	pstring key;
	fstring string_sid;
	int ret;
	int i;
	
	/* the key is the SID, retrieving is direct */

	sid_to_string(string_sid, &sid);
	slprintf(key, sizeof(key), "%s%s", GROUP_PREFIX, string_sid);

	kbuf.dptr = key;
	kbuf.dsize = strlen(key)+1;
		
	dbuf = tdb_fetch(tdb, kbuf);
	if (!dbuf.dptr) return False;

	ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
				&map->gid, &map->sid_name_use, &map->nt_name, &map->comment);

	for (i=0; i<PRIV_ALL_INDEX; i++)
		ret += tdb_unpack(dbuf.dptr+ret, dbuf.dsize-ret, "d", &map->privileges[i]);

	SAFE_FREE(dbuf.dptr);
	if (ret != dbuf.dsize) {
		DEBUG(0,("get_group_map_from_sid: group mapping TDB corrupted ?\n"));
		return False;
	}

	sid_copy(&map->sid, &sid);
	
	return True;
}


/****************************************************************************
return the sid and the type of the unix group
****************************************************************************/
BOOL get_group_map_from_gid(gid_t gid, GROUP_MAP *map)
{
	TDB_DATA kbuf, dbuf, newkey;
	fstring string_sid;
	int ret;
	int i;

	/* we need to enumerate the TDB to find the GID */

	for (kbuf = tdb_firstkey(tdb); 
	     kbuf.dptr; 
	     newkey = tdb_nextkey(tdb, kbuf), safe_free(kbuf.dptr), kbuf=newkey) {

		if (strncmp(kbuf.dptr, GROUP_PREFIX, strlen(GROUP_PREFIX)) != 0) continue;
		
		dbuf = tdb_fetch(tdb, kbuf);
		if (!dbuf.dptr) continue;

		fstrcpy(string_sid, kbuf.dptr+strlen(GROUP_PREFIX));

		string_to_sid(&map->sid, string_sid);
		
		ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
				 &map->gid, &map->sid_name_use, &map->nt_name, &map->comment);

		for (i=0; i<PRIV_ALL_INDEX; i++)
			ret += tdb_unpack(dbuf.dptr+ret, dbuf.dsize-ret, "d", &map->privileges[i]);

		SAFE_FREE(dbuf.dptr);
		if (ret != dbuf.dsize) continue;

		if (gid==map->gid)
			return True;
	}

	return False;
}

/****************************************************************************
return the sid and the type of the unix group
****************************************************************************/
BOOL get_group_map_from_ntname(char *name, GROUP_MAP *map)
{
	TDB_DATA kbuf, dbuf, newkey;
	fstring string_sid;
	int ret;
	int i;

	/* we need to enumerate the TDB to find the SID */

	for (kbuf = tdb_firstkey(tdb); 
	     kbuf.dptr; 
	     newkey = tdb_nextkey(tdb, kbuf), safe_free(kbuf.dptr), kbuf=newkey) {

		if (strncmp(kbuf.dptr, GROUP_PREFIX, strlen(GROUP_PREFIX)) != 0) continue;
		
		dbuf = tdb_fetch(tdb, kbuf);
		if (!dbuf.dptr) continue;

		fstrcpy(string_sid, kbuf.dptr+strlen(GROUP_PREFIX));

		string_to_sid(&map->sid, string_sid);
		
		ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
				 &map->gid, &map->sid_name_use, &map->nt_name, &map->comment);

		for (i=0; i<PRIV_ALL_INDEX; i++)
			ret += tdb_unpack(dbuf.dptr+ret, dbuf.dsize-ret, "d", &map->privileges[i]);

		SAFE_FREE(dbuf.dptr);
		if (ret != dbuf.dsize) continue;

		if (StrCaseCmp(name, map->nt_name)==0)
			return True;

	}

	return False;
}

/****************************************************************************
enumerate the group mapping
****************************************************************************/
BOOL group_map_remove(DOM_SID sid)
{
	TDB_DATA kbuf, dbuf;
	pstring key;
	fstring string_sid;
	
	/* the key is the SID, retrieving is direct */

	sid_to_string(string_sid, &sid);
	slprintf(key, sizeof(key), "%s%s", GROUP_PREFIX, string_sid);

	kbuf.dptr = key;
	kbuf.dsize = strlen(key)+1;
		
	dbuf = tdb_fetch(tdb, kbuf);
	if (!dbuf.dptr) return False;
	
	SAFE_FREE(dbuf.dptr);

	if(tdb_delete(tdb, kbuf) != TDB_SUCCESS)
		return False;

	return True;
}


/****************************************************************************
enumerate the group mapping
****************************************************************************/
BOOL enum_group_mapping(enum SID_NAME_USE sid_name_use, GROUP_MAP **rmap,
			int *num_entries, BOOL unix_only)
{
	TDB_DATA kbuf, dbuf, newkey;
	fstring string_sid;
	fstring group_type;
	GROUP_MAP map;
	GROUP_MAP *mapt;
	int ret;
	int entries=0;
	int i;

	*num_entries=0;
	*rmap=NULL;

	for (kbuf = tdb_firstkey(tdb); 
	     kbuf.dptr; 
	     newkey = tdb_nextkey(tdb, kbuf), safe_free(kbuf.dptr), kbuf=newkey) {

		if (strncmp(kbuf.dptr, GROUP_PREFIX, strlen(GROUP_PREFIX)) != 0)
			continue;
		
		dbuf = tdb_fetch(tdb, kbuf);
		if (!dbuf.dptr)
			continue;

		fstrcpy(string_sid, kbuf.dptr+strlen(GROUP_PREFIX));
				
		ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
				 &map.gid, &map.sid_name_use, &map.nt_name, &map.comment);

		for (i=0; i<PRIV_ALL_INDEX; i++)
			ret += tdb_unpack(dbuf.dptr+ret, dbuf.dsize-ret, "d", &map.privileges[i]);

		SAFE_FREE(dbuf.dptr);
		if (ret != dbuf.dsize)
			continue;

		/* list only the type or everything if UNKNOWN */
		if (sid_name_use!=SID_NAME_UNKNOWN  && sid_name_use!=map.sid_name_use)
			continue;

		if (unix_only==ENUM_ONLY_MAPPED && map.gid==-1)
			continue;

		string_to_sid(&map.sid, string_sid);
		
		decode_sid_name_use(group_type, map.sid_name_use);

		mapt=(GROUP_MAP *)Realloc((*rmap), (entries+1)*sizeof(GROUP_MAP));
		if (!mapt) {
			DEBUG(0,("enum_group_mapping: Unable to enlarge group map!\n"));
			SAFE_FREE(*rmap);
			return False;
		}
		else (*rmap) = mapt;

		mapt[entries].gid = map.gid;
		sid_copy( &mapt[entries].sid, &map.sid);
		mapt[entries].sid_name_use = map.sid_name_use;
		fstrcpy(mapt[entries].nt_name, map.nt_name);
		fstrcpy(mapt[entries].comment, map.comment);
		for (i=0; i<PRIV_ALL_INDEX; i++)
			mapt[entries].privileges[i] = map.privileges[i];

		entries++;
	}

	*num_entries=entries;
	return True;
}


/****************************************************************************
convert a privilege string to a privilege array
****************************************************************************/
void convert_priv_from_text(uint32 *se_priv, char *privilege)
{
	pstring tok;
	char *p = privilege;
	int i;

	/* By default no privilege */
	init_privilege(se_priv);
	
	if (privilege==NULL)
		return;

	while(next_token(&p, tok, " ", sizeof(tok)) ) {
		for (i=0; i<=PRIV_ALL_INDEX; i++) {
			if (StrCaseCmp(privs[i].priv, tok)==0)
				add_privilege(se_priv, privs[i].se_priv);
		}		
	}
}

/****************************************************************************
convert a privilege array to a privilege string
****************************************************************************/
void convert_priv_to_text(uint32 *se_priv, char *privilege)
{
	int i=0,j;

	if (privilege==NULL)
		return;

	ZERO_STRUCTP(privilege);

	if (check_empty_privilege(se_priv)) {
		fstrcat(privilege, "No privilege");
		return;
	}

	while(i<PRIV_ALL_INDEX && se_priv[i]!=0) {
		j=1;
		while (privs[j].se_priv!=se_priv[i])
			j++;

		fstrcat(privilege, privs[j].priv);
		fstrcat(privilege, " ");
		i++;
	}
}


/*
 *
 * High level functions
 * better to use them than the lower ones.
 *
 * we are checking if the group is in the mapping file
 * and if the group is an existing unix group
 *
 */

/* get a domain group from it's SID */

BOOL get_domain_group_from_sid(DOM_SID sid, GROUP_MAP *map)
{
	struct group *grp;

	DEBUG(10, ("get_domain_group_from_sid\n"));

	/* if the group is NOT in the database, it CAN NOT be a domain group */
	if(!get_group_map_from_sid(sid, map))
		return False;

	DEBUG(10, ("get_domain_group_from_sid: SID found in the TDB\n"));

	/* if it's not a domain group, continue */
	if (map->sid_name_use!=SID_NAME_DOM_GRP)
		return False;

	DEBUG(10, ("get_domain_group_from_sid: SID is a domain group\n"));
 	
	if (map->gid==-1)
		return False;

	DEBUG(10, ("get_domain_group_from_sid: SID is mapped to gid:%d\n",map->gid));

	if ( (grp=getgrgid(map->gid)) == NULL)
		return False;

	DEBUG(10, ("get_domain_group_from_sid: gid exists in UNIX security\n"));

	return True;
}


/* get a local (alias) group from it's SID */

BOOL get_local_group_from_sid(DOM_SID sid, GROUP_MAP *map)
{
	struct group *grp;

	/* The group is in the mapping table */
	if(get_group_map_from_sid(sid, map)) {
		if (map->sid_name_use!=SID_NAME_ALIAS)
			return False;
 	
		if (map->gid==-1)
			return False;

		if ( (grp=getgrgid(map->gid)) == NULL)
			return False;
	} else {
		/* the group isn't in the mapping table.
		 * make one based on the unix information */
		uint32 alias_rid;

		sid_peek_rid(&sid, &alias_rid);
		map->gid=pdb_user_rid_to_gid(alias_rid);

		if ((grp=getgrgid(map->gid)) == NULL)
			return False;

		map->sid_name_use=SID_NAME_ALIAS;

		fstrcpy(map->nt_name, grp->gr_name);
		fstrcpy(map->comment, "Local Unix Group");

		init_privilege(map->privileges);

		sid_copy(&map->sid, &sid);
	}

	return True;
}

/* get a builtin group from it's SID */

BOOL get_builtin_group_from_sid(DOM_SID sid, GROUP_MAP *map)
{
	struct group *grp;

	if(!get_group_map_from_sid(sid, map))
		return False;

	if (map->sid_name_use!=SID_NAME_WKN_GRP)
		return False;

	if (map->gid==-1)
		return False;

	if ( (grp=getgrgid(map->gid)) == NULL)
		return False;

	return True;
}



/****************************************************************************
Returns a GROUP_MAP struct based on the gid.
****************************************************************************/
BOOL get_group_from_gid(gid_t gid, GROUP_MAP *map)
{
	struct group *grp;

	if ( (grp=getgrgid(gid)) == NULL)
		return False;

	/*
	 * make a group map from scratch if doesn't exist.
	 */
	if (!get_group_map_from_gid(gid, map)) {
		map->gid=gid;
		map->sid_name_use=SID_NAME_ALIAS;
		init_privilege(map->privileges);

		sid_copy(&map->sid, &global_sam_sid);
		sid_append_rid(&map->sid, pdb_gid_to_group_rid(gid));

		fstrcpy(map->nt_name, grp->gr_name);
		fstrcpy(map->comment, "Local Unix Group");
	}
	
	return True;
}




/****************************************************************************
 Get the member users of a group and
 all the users who have that group as primary.
            
 give back an array of uid
 return the grand number of users


 TODO: sort the list and remove duplicate. JFM.

****************************************************************************/
        
BOOL get_uid_list_of_group(gid_t gid, uid_t **uid, int *num_uids)
{
	struct group *grp;
	struct passwd *pwd;
	int i=0;
	char *gr;
	uid_t *u;
 
	*num_uids = 0;
	*uid=NULL;
	
	if ( (grp=getgrgid(gid)) == NULL)
		return False;

	gr = grp->gr_mem[0];
	DEBUG(10, ("getting members\n"));
        
	while (gr && (*gr != (char)'\0')) {
		u = Realloc((*uid), sizeof(uid_t)*(*num_uids+1));
		if (!u) {
			DEBUG(0,("get_uid_list_of_group: unable to enlarge uid list!\n"));
			return False;
		}
		else (*uid) = u;

		if( (pwd=getpwnam(gr)) !=NULL) {
			(*uid)[*num_uids]=pwd->pw_uid;
			(*num_uids)++;
		}
		gr = grp->gr_mem[++i];
	}
	DEBUG(10, ("got [%d] members\n", *num_uids));

	setpwent();
	while ((pwd=getpwent()) != NULL) {
		if (pwd->pw_gid==gid) {
			u = Realloc((*uid), sizeof(uid_t)*(*num_uids+1));
			if (!u) {
				DEBUG(0,("get_uid_list_of_group: unable to enlarge uid list!\n"));
				return False;
			}
			else (*uid) = u;
			(*uid)[*num_uids]=pwd->pw_uid;

			(*num_uids)++;
		}
	}
	endpwent();
	DEBUG(10, ("got primary groups, members: [%d]\n", *num_uids));

        return True;
}

/****************************************************************************
 Create a UNIX group on demand.
****************************************************************************/

int smb_create_group(char *unix_group)
{
	pstring add_script;
	int ret;

	pstrcpy(add_script, lp_addgroup_script());
	if (! *add_script) return -1;
	pstring_sub(add_script, "%g", unix_group);
	ret = smbrun(add_script,NULL);
	DEBUG(3,("smb_create_group: Running the command `%s' gave %d\n",add_script,ret));
	return ret;
}

/****************************************************************************
 Delete a UNIX group on demand.
****************************************************************************/

int smb_delete_group(char *unix_group)
{
	pstring del_script;
	int ret;

	pstrcpy(del_script, lp_delgroup_script());
	if (! *del_script) return -1;
	pstring_sub(del_script, "%g", unix_group);
	ret = smbrun(del_script,NULL);
	DEBUG(3,("smb_delete_group: Running the command `%s' gave %d\n",del_script,ret));
	return ret;
}

/****************************************************************************
 Create a UNIX group on demand.
****************************************************************************/

int smb_add_user_group(char *unix_group, char *unix_user)
{
	pstring add_script;
	int ret;

	pstrcpy(add_script, lp_addusertogroup_script());
	if (! *add_script) return -1;
	pstring_sub(add_script, "%g", unix_group);
	pstring_sub(add_script, "%u", unix_user);
	ret = smbrun(add_script,NULL);
	DEBUG(3,("smb_add_user_group: Running the command `%s' gave %d\n",add_script,ret));
	return ret;
}

/****************************************************************************
 Delete a UNIX group on demand.
****************************************************************************/

int smb_delete_user_group(char *unix_group, char *unix_user)
{
	pstring del_script;
	int ret;

	pstrcpy(del_script, lp_deluserfromgroup_script());
	if (! *del_script) return -1;
	pstring_sub(del_script, "%g", unix_group);
	pstring_sub(del_script, "%u", unix_user);
	ret = smbrun(del_script,NULL);
	DEBUG(3,("smb_delete_user_group: Running the command `%s' gave %d\n",del_script,ret));
	return ret;
}