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30191d1a57
bugs in various places whilst doing this (places that assumed
BOOL == int). I also need to fix the Samba4 pidl generation
(next checkin).
Jeremy.
(This used to be commit f35a266b3c
)
199 lines
4.6 KiB
C
199 lines
4.6 KiB
C
/*
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Unix SMB/CIFS implementation.
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system call wrapper interface.
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Copyright (C) Andrew Tridgell 2002
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Copyright (C) Andrew Barteltt 2002
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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This file may assume linkage with smbd - for things like become_root()
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etc.
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*/
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#include "includes.h"
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#ifndef HAVE_GETGROUPLIST
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/*
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This is a *much* faster way of getting the list of groups for a user
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without changing the current supplementary group list. The old
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method used getgrent() which could take 20 minutes on a really big
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network with hundeds of thousands of groups and users. The new method
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takes a couple of seconds.
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NOTE!! this function only works if it is called as root!
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*/
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static int getgrouplist_internals(const char *user, gid_t gid, gid_t *groups,
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int *grpcnt)
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{
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gid_t *gids_saved;
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int ret, ngrp_saved, num_gids;
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if (non_root_mode()) {
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*grpcnt = 0;
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return 0;
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}
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/* work out how many groups we need to save */
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ngrp_saved = getgroups(0, NULL);
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if (ngrp_saved == -1) {
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/* this shouldn't happen */
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return -1;
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}
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gids_saved = SMB_MALLOC_ARRAY(gid_t, ngrp_saved+1);
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if (!gids_saved) {
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errno = ENOMEM;
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return -1;
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}
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ngrp_saved = getgroups(ngrp_saved, gids_saved);
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if (ngrp_saved == -1) {
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SAFE_FREE(gids_saved);
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/* very strange! */
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return -1;
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}
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if (initgroups(user, gid) != 0) {
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DEBUG(0, ("getgrouplist_internals: initgroups() failed!\n"));
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SAFE_FREE(gids_saved);
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return -1;
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}
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/* this must be done to cope with systems that put the current egid in the
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return from getgroups() */
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save_re_gid();
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set_effective_gid(gid);
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setgid(gid);
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num_gids = getgroups(0, NULL);
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if (num_gids == -1) {
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SAFE_FREE(gids_saved);
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/* very strange! */
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return -1;
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}
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if (num_gids + 1 > *grpcnt) {
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*grpcnt = num_gids + 1;
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ret = -1;
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} else {
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ret = getgroups(*grpcnt - 1, &groups[1]);
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if (ret < 0) {
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SAFE_FREE(gids_saved);
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/* very strange! */
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return -1;
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}
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groups[0] = gid;
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*grpcnt = ret + 1;
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}
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restore_re_gid();
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if (sys_setgroups(gid, ngrp_saved, gids_saved) != 0) {
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/* yikes! */
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DEBUG(0,("ERROR: getgrouplist: failed to reset group list!\n"));
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smb_panic("getgrouplist: failed to reset group list!");
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}
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free(gids_saved);
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return ret;
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}
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#endif
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static int sys_getgrouplist(const char *user, gid_t gid, gid_t *groups, int *grpcnt)
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{
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int retval;
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bool winbind_env;
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DEBUG(10,("sys_getgrouplist: user [%s]\n", user));
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/* This is only ever called for Unix users, remote memberships are
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* always determined by the info3 coming back from auth3 or the
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* PAC. */
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winbind_env = winbind_env_set();
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winbind_off();
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#ifdef HAVE_GETGROUPLIST
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retval = getgrouplist(user, gid, groups, grpcnt);
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#else
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become_root();
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retval = getgrouplist_internals(user, gid, groups, grpcnt);
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unbecome_root();
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#endif
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/* allow winbindd lookups, but only if they were not already disabled */
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if (!winbind_env) {
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winbind_on();
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}
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return retval;
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}
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bool getgroups_unix_user(TALLOC_CTX *mem_ctx, const char *user,
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gid_t primary_gid,
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gid_t **ret_groups, size_t *p_ngroups)
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{
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size_t ngrp;
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int max_grp;
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gid_t *temp_groups;
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gid_t *groups;
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int i;
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max_grp = MIN(32, groups_max());
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temp_groups = SMB_MALLOC_ARRAY(gid_t, max_grp);
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if (! temp_groups) {
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return False;
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}
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if (sys_getgrouplist(user, primary_gid, temp_groups, &max_grp) == -1) {
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temp_groups = SMB_REALLOC_ARRAY(temp_groups, gid_t, max_grp);
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if (!temp_groups) {
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return False;
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}
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if (sys_getgrouplist(user, primary_gid,
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temp_groups, &max_grp) == -1) {
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DEBUG(0, ("get_user_groups: failed to get the unix "
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"group list\n"));
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SAFE_FREE(temp_groups);
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return False;
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}
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}
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ngrp = 0;
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groups = NULL;
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/* Add in primary group first */
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if (!add_gid_to_array_unique(mem_ctx, primary_gid, &groups, &ngrp)) {
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SAFE_FREE(temp_groups);
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return False;
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}
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for (i=0; i<max_grp; i++) {
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if (!add_gid_to_array_unique(mem_ctx, temp_groups[i],
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&groups, &ngrp)) {
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SAFE_FREE(temp_groups);
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return False;
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}
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}
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*p_ngroups = ngrp;
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*ret_groups = groups;
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SAFE_FREE(temp_groups);
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return True;
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}
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