openpam_restore_cred.c revision 115619
1234285Sdim/*- 2234285Sdim * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 3234285Sdim * All rights reserved. 4234285Sdim * 5234285Sdim * This software was developed for the FreeBSD Project by ThinkSec AS and 6234285Sdim * Network Associates Laboratories, the Security Research Division of 7234285Sdim * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 8234285Sdim * ("CBOSS"), as part of the DARPA CHATS research program. 9234285Sdim * 10234285Sdim * Redistribution and use in source and binary forms, with or without 11234285Sdim * modification, are permitted provided that the following conditions 12234285Sdim * are met: 13234285Sdim * 1. Redistributions of source code must retain the above copyright 14234285Sdim * notice, this list of conditions and the following disclaimer. 15249423Sdim * 2. Redistributions in binary form must reproduce the above copyright 16249423Sdim * notice, this list of conditions and the following disclaimer in the 17234285Sdim * documentation and/or other materials provided with the distribution. 18249423Sdim * 3. The name of the author may not be used to endorse or promote 19249423Sdim * products derived from this software without specific prior written 20234285Sdim * permission. 21243830Sdim * 22234285Sdim * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23234285Sdim * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24234285Sdim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25234285Sdim * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26249423Sdim * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27234285Sdim * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28234285Sdim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29234285Sdim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30239462Sdim * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31234285Sdim * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32234285Sdim * SUCH DAMAGE. 33234285Sdim * 34234285Sdim * $P4: //depot/projects/openpam/lib/openpam_restore_cred.c#8 $ 35234285Sdim */ 36234285Sdim 37234285Sdim#include <sys/param.h> 38234285Sdim 39239462Sdim#include <grp.h> 40234285Sdim#include <pwd.h> 41234285Sdim#include <stdlib.h> 42234285Sdim#include <unistd.h> 43234285Sdim 44243830Sdim#include <security/pam_appl.h> 45243830Sdim 46243830Sdim#include "openpam_impl.h" 47243830Sdim 48243830Sdim/* 49249423Sdim * OpenPAM extension 50243830Sdim * 51249423Sdim * Restore credentials 52249423Sdim */ 53249423Sdim 54243830Sdimint 55243830Sdimopenpam_restore_cred(pam_handle_t *pamh) 56249423Sdim{ 57249423Sdim struct pam_saved_cred *scred; 58249423Sdim int r; 59249423Sdim 60234285Sdim ENTER(); 61234285Sdim r = pam_get_data(pamh, PAM_SAVED_CRED, (const void **)&scred); 62234285Sdim if (r != PAM_SUCCESS) 63234285Sdim RETURNC(r); 64234285Sdim if (scred == NULL) 65239462Sdim RETURNC(PAM_SYSTEM_ERR); 66234285Sdim if (scred->euid != geteuid()) { 67234285Sdim if (seteuid(scred->euid) < 0 || 68234285Sdim setgroups(scred->ngroups, scred->groups) < 0 || 69234285Sdim setegid(scred->egid) < 0) 70234285Sdim RETURNC(PAM_SYSTEM_ERR); 71234285Sdim } 72234285Sdim pam_set_data(pamh, PAM_SAVED_CRED, NULL, NULL); 73234285Sdim RETURNC(PAM_SUCCESS); 74234285Sdim} 75234285Sdim 76234285Sdim/* 77234285Sdim * Error codes: 78243830Sdim * 79243830Sdim * =pam_get_data 80243830Sdim * PAM_SYSTEM_ERR 81234285Sdim */ 82234285Sdim 83234285Sdim/** 84234285Sdim * The =openpam_restore_cred function restores the credentials saved by 85234285Sdim * =openpam_borrow_cred. 86234285Sdim * 87234285Sdim * >setegid 88234982Sdim * >seteuid 89234982Sdim * >setgroups 90234982Sdim */ 91234982Sdim