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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 3 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, see <http://www.gnu.org/licenses/>.
*/
/*
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 supplementary 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 = SMB_MALLOC_ARRAY(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) {
SAFE_FREE(gids_saved);
/* very strange! */
return -1;
}
if (num_gids + 1 > *grpcnt) {
*grpcnt = num_gids + 1;
ret = -1;
} else {
ret = getgroups(*grpcnt - 1, &groups[1]);
if (ret < 0) {
SAFE_FREE(gids_saved);
/* very strange! */
return -1;
}
groups[0] = gid;
*grpcnt = ret + 1;
}
restore_re_gid();
if (sys_setgroups(gid, ngrp_saved, gids_saved) != 0) {
/* yikes! */
DEBUG(0,("ERROR: getgrouplist: failed to reset group list!\n"));
smb_panic("getgrouplist: failed to reset group list!");
}
free(gids_saved);
return ret;
}
#endif
static int sys_getgrouplist(const char *user, gid_t gid, gid_t *groups, int *grpcnt)
{
int retval;
BOOL winbind_env;
DEBUG(10,("sys_getgrouplist: user [%s]\n", user));
/* This is only ever called for Unix users, remote memberships are
* always determined by the info3 coming back from auth3 or the
* PAC. */
winbind_env = winbind_env_set();
winbind_off();
#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, but only if they were not already disabled */
if (!winbind_env) {
winbind_on();
}
return retval;
}
BOOL getgroups_unix_user(TALLOC_CTX *mem_ctx, const char *user,
gid_t primary_gid,
gid_t **ret_groups, size_t *p_ngroups)
{
size_t ngrp;
int max_grp;
gid_t *temp_groups;
gid_t *groups;
int i;
max_grp = MIN(32, groups_max());
temp_groups = SMB_MALLOC_ARRAY(gid_t, max_grp);
if (! temp_groups) {
return False;
}
if (sys_getgrouplist(user, primary_gid, temp_groups, &max_grp) == -1) {
temp_groups = SMB_REALLOC_ARRAY(temp_groups, gid_t, max_grp);
if (!temp_groups) {
return False;
}
if (sys_getgrouplist(user, primary_gid,
temp_groups, &max_grp) == -1) {
DEBUG(0, ("get_user_groups: failed to get the unix "
"group list\n"));
SAFE_FREE(temp_groups);
return False;
}
}
ngrp = 0;
groups = NULL;
/* Add in primary group first */
if (!add_gid_to_array_unique(mem_ctx, primary_gid, &groups, &ngrp)) {
SAFE_FREE(temp_groups);
return False;
}
for (i=0; i<max_grp; i++) {
if (!add_gid_to_array_unique(mem_ctx, temp_groups[i],
&groups, &ngrp)) {
SAFE_FREE(temp_groups);
return False;
}
}
*p_ngroups = ngrp;
*ret_groups = groups;
SAFE_FREE(temp_groups);
return True;
}
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