1/* $NetBSD: openpam_restore_cred.c,v 1.4 2023/06/30 21:46:20 christos Exp $ */ 2 3/*- 4 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 5 * Copyright (c) 2004-2011 Dag-Erling Sm��rgrav 6 * All rights reserved. 7 * 8 * This software was developed for the FreeBSD Project by ThinkSec AS and 9 * Network Associates Laboratories, the Security Research Division of 10 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 11 * ("CBOSS"), as part of the DARPA CHATS research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. The name of the author may not be used to endorse or promote 22 * products derived from this software without specific prior written 23 * permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38#ifdef HAVE_CONFIG_H 39# include "config.h" 40#endif 41 42#include <sys/cdefs.h> 43__RCSID("$NetBSD: openpam_restore_cred.c,v 1.4 2023/06/30 21:46:20 christos Exp $"); 44 45#include <sys/param.h> 46 47#include <grp.h> 48#include <limits.h> 49#include <pwd.h> 50#include <stdlib.h> 51#include <unistd.h> 52 53#include <security/pam_appl.h> 54 55#include "openpam_impl.h" 56#include "openpam_cred.h" 57 58/* 59 * OpenPAM extension 60 * 61 * Restore credentials 62 */ 63 64int 65openpam_restore_cred(pam_handle_t *pamh) 66{ 67 const struct pam_saved_cred *scred; 68 const void *scredp; 69 int r; 70 71 ENTER(); 72 r = pam_get_data(pamh, PAM_SAVED_CRED, &scredp); 73 if (r != PAM_SUCCESS) 74 RETURNC(r); 75 if (scredp == NULL) 76 RETURNC(PAM_SYSTEM_ERR); 77 scred = scredp; 78 if (scred->euid != geteuid()) { 79 if (seteuid(scred->euid) < 0 || 80 setgroups(scred->ngroups, scred->groups) < 0 || 81 setegid(scred->egid) < 0) 82 RETURNC(PAM_SYSTEM_ERR); 83 } 84 pam_set_data(pamh, PAM_SAVED_CRED, NULL, NULL); 85 RETURNC(PAM_SUCCESS); 86} 87 88/* 89 * Error codes: 90 * 91 * =pam_get_data 92 * PAM_SYSTEM_ERR 93 */ 94 95/** 96 * The =openpam_restore_cred function restores the credentials saved by 97 * =openpam_borrow_cred. 98 * 99 * >setegid 2 100 * >seteuid 2 101 * >setgroups 2 102 */ 103