1 /*- 2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 3 * Copyright (c) 2004-2011 Dag-Erling Smørgrav 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project by ThinkSec AS and 7 * Network Associates Laboratories, the Security Research Division of 8 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 9 * ("CBOSS"), as part of the DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The name of the author may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $OpenPAM: openpam_restore_cred.c 938 2017-04-30 21:34:42Z des $ 36 */ 37 38 #ifdef HAVE_CONFIG_H 39 # include "config.h" 40 #endif 41 42 #include <sys/param.h> 43 44 #include <grp.h> 45 #include <limits.h> 46 #include <pwd.h> 47 #include <stdlib.h> 48 #include <unistd.h> 49 50 #include <security/pam_appl.h> 51 52 #include "openpam_impl.h" 53 #include "openpam_cred.h" 54 55 /* 56 * OpenPAM extension 57 * 58 * Restore credentials 59 */ 60 61 int 62 openpam_restore_cred(pam_handle_t *pamh) 63 { 64 const struct pam_saved_cred *scred; 65 const void *scredp; 66 int r; 67 68 ENTER(); 69 r = pam_get_data(pamh, PAM_SAVED_CRED, &scredp); 70 if (r != PAM_SUCCESS) 71 RETURNC(r); 72 if (scredp == NULL) 73 RETURNC(PAM_SYSTEM_ERR); 74 scred = scredp; 75 if (scred->euid != geteuid()) { 76 if (seteuid(scred->euid) < 0 || 77 setgroups(scred->ngroups, scred->groups) < 0 || 78 setegid(scred->egid) < 0) 79 RETURNC(PAM_SYSTEM_ERR); 80 } 81 pam_set_data(pamh, PAM_SAVED_CRED, NULL, NULL); 82 RETURNC(PAM_SUCCESS); 83 } 84 85 /* 86 * Error codes: 87 * 88 * =pam_get_data 89 * PAM_SYSTEM_ERR 90 */ 91 92 /** 93 * The =openpam_restore_cred function restores the credentials saved by 94 * =openpam_borrow_cred. 95 * 96 * >setegid 2 97 * >seteuid 2 98 * >setgroups 2 99 */ 100