187396Sdes/*- 287396Sdes * Copyright (c) 2001 Mark R V Murray 387396Sdes * All rights reserved. 493984Sdes * Copyright (c) 2001,2002 Networks Associates Technology, Inc. 587396Sdes * All rights reserved. 687396Sdes * 787396Sdes * Portions of this software were developed for the FreeBSD Project by 887396Sdes * ThinkSec AS and NAI Labs, the Security Research Division of Network 987396Sdes * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 1087396Sdes * ("CBOSS"), as part of the DARPA CHATS research program. 1187396Sdes * 1287396Sdes * Redistribution and use in source and binary forms, with or without 1387396Sdes * modification, are permitted provided that the following conditions 1487396Sdes * are met: 1587396Sdes * 1. Redistributions of source code must retain the above copyright 1687396Sdes * notice, this list of conditions and the following disclaimer. 1787396Sdes * 2. Redistributions in binary form must reproduce the above copyright 1887396Sdes * notice, this list of conditions and the following disclaimer in the 1987396Sdes * documentation and/or other materials provided with the distribution. 2087396Sdes * 3. The name of the author may not be used to endorse or promote 2187396Sdes * products derived from this software without specific prior written 2287396Sdes * permission. 2387396Sdes * 2487396Sdes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 2587396Sdes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2687396Sdes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2787396Sdes * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2887396Sdes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2987396Sdes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3087396Sdes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3187396Sdes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3287396Sdes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3387396Sdes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3487396Sdes * SUCH DAMAGE. 3587396Sdes */ 3687396Sdes 3787396Sdes#include <sys/cdefs.h> 3887396Sdes__FBSDID("$FreeBSD: releng/10.3/lib/libpam/modules/pam_self/pam_self.c 94564 2002-04-12 22:27:25Z des $"); 3987396Sdes 4087396Sdes#define _BSD_SOURCE 4187396Sdes 4289704Sdes#include <pwd.h> 4387396Sdes#include <unistd.h> 4487396Sdes#include <syslog.h> 4587396Sdes 4687396Sdes#define PAM_SM_AUTH 4787396Sdes 4890229Sdes#include <security/pam_appl.h> 4987396Sdes#include <security/pam_modules.h> 5090229Sdes#include <security/pam_mod_misc.h> 5187396Sdes 5294564Sdes#define OPT_ALLOW_ROOT "allow_root" 5389733Sdes 5487396SdesPAM_EXTERN int 5594564Sdespam_sm_authenticate(pam_handle_t *pamh, int flags __unused, 5694564Sdes int argc __unused, const char *argv[] __unused) 5787396Sdes{ 5889704Sdes struct passwd *pwd; 5989704Sdes const char *luser; 6089704Sdes int pam_err; 6189733Sdes uid_t uid; 6287396Sdes 6393984Sdes pam_err = pam_get_user(pamh, &luser, NULL); 6489704Sdes if (pam_err != PAM_SUCCESS) 6594564Sdes return (pam_err); 6689704Sdes if (luser == NULL || (pwd = getpwnam(luser)) == NULL) 6794564Sdes return (PAM_AUTH_ERR); 6887396Sdes 6989733Sdes uid = getuid(); 7094564Sdes if (uid == 0 && !openpam_get_option(pamh, OPT_ALLOW_ROOT)) 7194564Sdes return (PAM_AUTH_ERR); 7294564Sdes 7389733Sdes if (uid == (uid_t)pwd->pw_uid) 7494564Sdes return (PAM_SUCCESS); 7594564Sdes 7687396Sdes PAM_VERBOSE_ERROR("Refused; source and target users differ"); 7787396Sdes 7894564Sdes return (PAM_AUTH_ERR); 7987396Sdes} 8087396Sdes 8187396SdesPAM_EXTERN int 8294564Sdespam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused, 8394564Sdes int argc __unused, const char *argv[] __unused) 8487396Sdes{ 8587396Sdes 8694564Sdes return (PAM_SUCCESS); 8787396Sdes} 8887396Sdes 8987396SdesPAM_MODULE_ENTRY("pam_self"); 90