1/* $NetBSD: openpam_restore_cred.c,v 1.2 2011/12/25 22:27:55 christos Exp $ */ 2 3/*- 4 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 5 * Copyright (c) 2004-2011 Dag-Erling Smørgrav 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 * Id: openpam_restore_cred.c 437 2011-09-13 12:00:13Z des 38 */ 39 40#ifdef HAVE_CONFIG_H 41# include "config.h" 42#endif 43 44#include <sys/param.h> 45 46#include <grp.h> 47#include <limits.h> 48#include <pwd.h> 49#include <stdlib.h> 50#include <unistd.h> 51 52#include <security/pam_appl.h> 53 54#include "openpam_impl.h" 55 56/* 57 * OpenPAM extension 58 * 59 * Restore credentials 60 */ 61 62int 63openpam_restore_cred(pam_handle_t *pamh) 64{ 65 const struct pam_saved_cred *scred; 66 const void *scredp; 67 int r; 68 69 ENTER(); 70 r = pam_get_data(pamh, PAM_SAVED_CRED, &scredp); 71 if (r != PAM_SUCCESS) 72 RETURNC(r); 73 if (scredp == NULL) 74 RETURNC(PAM_SYSTEM_ERR); 75 scred = scredp; 76 if (scred->euid != geteuid()) { 77 if (seteuid(scred->euid) < 0 || 78 setgroups(scred->ngroups, scred->groups) < 0 || 79 setegid(scred->egid) < 0) 80 RETURNC(PAM_SYSTEM_ERR); 81 } 82 pam_set_data(pamh, PAM_SAVED_CRED, NULL, NULL); 83 RETURNC(PAM_SUCCESS); 84 /*NOTREACHED*/ 85} 86 87/* 88 * Error codes: 89 * 90 * =pam_get_data 91 * PAM_SYSTEM_ERR 92 */ 93 94/** 95 * The =openpam_restore_cred function restores the credentials saved by 96 * =openpam_borrow_cred. 97 * 98 * >setegid 2 99 * >seteuid 2 100 * >setgroups 2 101 */ 102