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/*
Unix SMB/Netbios implementation.
Version 1.9.
Groupname handling
Copyright (C) Jeremy Allison 1998.
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 int DEBUGLEVEL;
extern DOM_SID global_machine_sid;
/**************************************************************************
Groupname map functionality. The code loads a groupname map file and
(currently) loads it into a linked list. This is slow and memory
hungry, but can be changed into a more efficient storage format
if the demands on it become excessive.
***************************************************************************/
typedef struct groupname_map {
ubi_slNode next;
char *windows_name;
DOM_SID windows_sid;
char *unix_name;
gid_t unix_gid;
} groupname_map_entry;
static ubi_slList groupname_map_list;
/**************************************************************************
Delete all the entries in the groupname map list.
***************************************************************************/
static void delete_groupname_map_list(void)
{
groupname_map_entry *gmep;
while((gmep = (groupname_map_entry *)ubi_slRemHead( &groupname_map_list )) != NULL) {
if(gmep->windows_name)
free(gmep->windows_name);
if(gmep->unix_name)
free(gmep->unix_name);
free((char *)gmep);
}
}
/**************************************************************************
Load a groupname map file. Sets last accessed timestamp.
***************************************************************************/
void load_groupname_map(void)
{
static time_t groupmap_file_last_modified = (time_t)0;
static BOOL initialized = False;
char *groupname_map_file = lp_groupname_map();
struct stat st;
FILE *fp;
char *s;
pstring buf;
groupname_map_entry *new_ep;
if(!initialized) {
ubi_slInitList( &groupname_map_list );
initialized = True;
}
if (!*groupname_map_file)
return;
if(stat(groupname_map_file, &st) != 0) {
DEBUG(0, ("load_groupname_map: Unable to stat file %s. Error was %s\n",
groupname_map_file, strerror(errno) ));
return;
}
/*
* Check if file has changed.
*/
if( st.st_mtime <= groupmap_file_last_modified)
return;
groupmap_file_last_modified = st.st_mtime;
/*
* Load the file.
*/
fp = fopen(groupname_map_file,"r");
if (!fp) {
DEBUG(0,("load_groupname_map: can't open groupname map %s. Error was %s\n",
groupname_map_file, strerror(errno)));
return;
}
/*
* Throw away any previous list.
*/
delete_groupname_map_list();
DEBUG(4,("load_groupname_map: Scanning groupname map %s\n",groupname_map_file));
while((s=fgets_slash(buf,sizeof(buf),fp))!=NULL) {
pstring unixname;
pstring windows_name;
struct group *gptr;
DOM_SID tmp_sid;
DEBUG(10,("load_groupname_map: Read line |%s|\n", s));
if (!*s || strchr("#;",*s))
continue;
if(!next_token(&s,unixname, "\t\n\r="))
continue;
if(!next_token(&s,windows_name, "\t\n\r="))
continue;
trim_string(unixname, " ", " ");
trim_string(windows_name, " ", " ");
if (!*windows_name)
continue;
if(!*unixname)
continue;
DEBUG(5,("load_groupname_map: unixname = %s, windowsname = %s.\n",
unixname, windows_name));
/*
* Attempt to get the unix gid_t for this name.
*/
if((gptr = (struct group *)getgrnam(unixname)) == NULL) {
DEBUG(0,("load_groupname_map: getgrnam for group %s failed.\
Error was %s.\n", unixname, strerror(errno) ));
continue;
}
/*
* Now map to an NT SID.
*/
if(!lookup_wellknown_sid_from_name(windows_name, &tmp_sid)) {
/*
* It's not a well known name, convert the UNIX gid_t
* to a rid within this domain SID.
*/
tmp_sid = global_machine_sid;
tmp_sid.sub_auths[tmp_sid.num_auths++] =
pdb_gid_to_group_rid((gid_t)gptr->gr_gid);
}
/*
* Create the list entry and add it onto the list.
*/
if((new_ep = (groupname_map_entry *)malloc( sizeof(groupname_map_entry) ))== NULL) {
DEBUG(0,("load_groupname_map: malloc fail for groupname_map_entry.\n"));
fclose(fp);
return;
}
new_ep->unix_gid = gptr->gr_gid;
new_ep->windows_sid = tmp_sid;
new_ep->windows_name = strdup( windows_name );
new_ep->unix_name = strdup( unixname );
if(new_ep->windows_name == NULL || new_ep->unix_name == NULL) {
DEBUG(0,("load_groupname_map: malloc fail for names in groupname_map_entry.\n"));
fclose(fp);
if(new_ep->windows_name != NULL)
free(new_ep->windows_name);
if(new_ep->unix_name != NULL)
free(new_ep->unix_name);
free((char *)new_ep);
return;
}
memset((char *)&new_ep->next, '\0', sizeof(new_ep->next) );
ubi_slAddHead( &groupname_map_list, (ubi_slNode *)new_ep);
}
DEBUG(10,("load_groupname_map: Added %d entries to groupname map.\n",
ubi_slCount( &groupname_map_list ) ));
fclose(fp);
}
/***********************************************************
Lookup a SID entry by gid_t.
************************************************************/
void map_gid_to_sid( gid_t gid, DOM_SID *psid)
{
groupname_map_entry *gmep;
/*
* Initialize and load if not already loaded.
*/
load_groupname_map();
for( gmep = (groupname_map_entry *)ubi_slFirst( &groupname_map_list);
gmep; gmep = (groupname_map_entry *)ubi_slNext( gmep )) {
if( gmep->unix_gid == gid) {
*psid = gmep->windows_sid;
DEBUG(7,("map_gid_to_sid: Mapping unix group %s to windows group %s.\n",
gmep->unix_name, gmep->windows_name ));
return;
}
}
/*
* If there's no map, convert the UNIX gid_t
* to a rid within this domain SID.
*/
*psid = global_machine_sid;
psid->sub_auths[psid->num_auths++] = pdb_gid_to_group_rid(gid);
return;
}
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