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/*
Unix SMB/CIFS implementation.
system call wrapper interface.
Copyright (C) Andrew Tridgell 2002
Copyright (C) Andrew Barteltt 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 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.
*/
/*
This file may assume linkage with smbd - for things like become_root()
etc.
*/
#include "includes.h"
#ifndef HAVE_GETGROUPLIST
/*
This is a *much* faster way of getting the list of groups for a user
without changing the current supplemenrary group list. The old
method used getgrent() which could take 20 minutes on a really big
network with hundeds of thousands of groups and users. The new method
takes a couple of seconds.
NOTE!! this function only works if it is called as root!
*/
static int getgrouplist_internals(const char *user, gid_t gid, gid_t *groups, int *grpcnt)
{
gid_t *gids_saved;
int ret, ngrp_saved, num_gids;
if (non_root_mode()) {
*grpcnt = 0;
return 0;
}
/* work out how many groups we need to save */
ngrp_saved = getgroups(0, NULL);
if (ngrp_saved == -1) {
/* this shouldn't happen */
return -1;
}
gids_saved = (gid_t *)malloc(sizeof(gid_t) * (ngrp_saved+1));
if (!gids_saved) {
errno = ENOMEM;
return -1;
}
ngrp_saved = getgroups(ngrp_saved, gids_saved);
if (ngrp_saved == -1) {
SAFE_FREE(gids_saved);
/* very strange! */
return -1;
}
if (initgroups(user, gid) != 0) {
DEBUG(0, ("getgrouplist_internals: initgroups() failed!\n"));
SAFE_FREE(gids_saved);
return -1;
}
/* this must be done to cope with systems that put the current egid in the
return from getgroups() */
save_re_gid();
set_effective_gid(gid);
setgid(gid);
num_gids = getgroups(0, NULL);
if (num_gids + 1 > *grpcnt) {
*grpcnt = num_gids + 1;
ret = -1;
} else {
ret = getgroups(*grpcnt - 1, &groups[1]);
if (ret >= 0) {
groups[0] = gid;
*grpcnt = ret + 1;
}
}
restore_re_gid();
if (sys_setgroups(ngrp_saved, gids_saved) != 0) {
/* yikes! */
DEBUG(0,("ERROR: getgrouplist: failed to reset group list!\n"));
smb_panic("getgrouplist: failed to reset group list!\n");
free(gids_saved);
return -1;
}
free(gids_saved);
return ret;
}
#endif
int sys_getgrouplist(const char *user, gid_t gid, gid_t *groups, int *grpcnt)
{
char *p;
int retval;
DEBUG(10,("sys_getgrouplist: user [%s]\n", user));
/* see if we should disable winbindd lookups for local users */
if ( (p = strchr(user, *lp_winbind_separator())) == NULL ) {
if ( !winbind_off() )
DEBUG(0,("sys_getgroup_list: Insufficient environment space for %s\n",
WINBINDD_DONT_ENV));
else
DEBUG(10,("sys_getgrouplist(): disabled winbindd for group lookup [user == %s]\n",
user));
}
#ifdef HAVE_GETGROUPLIST
retval = getgrouplist(user, gid, groups, grpcnt);
#else
become_root();
retval = getgrouplist_internals(user, gid, groups, grpcnt);
unbecome_root();
#endif
/* allow winbindd lookups */
winbind_on();
return retval;
}
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