pam_securetty.c revision 81475
185587Sobrien/*- 285587Sobrien * Copyright (c) 2001 Mark R V Murray 385587Sobrien * All rights reserved. 485587Sobrien * 585587Sobrien * Redistribution and use in source and binary forms, with or without 685587Sobrien * modification, are permitted provided that the following conditions 785587Sobrien * are met: 885587Sobrien * 1. Redistributions of source code must retain the above copyright 985587Sobrien * notice, this list of conditions and the following disclaimer. 1085587Sobrien * 2. Redistributions in binary form must reproduce the above copyright 1185587Sobrien * notice, this list of conditions and the following disclaimer in the 1285587Sobrien * documentation and/or other materials provided with the distribution. 1385587Sobrien * 1485587Sobrien * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1585587Sobrien * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1685587Sobrien * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1785587Sobrien * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1885587Sobrien * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1985587Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2085587Sobrien * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2185587Sobrien * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2285587Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2385587Sobrien * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2485587Sobrien * SUCH DAMAGE. 2585587Sobrien * 2685587Sobrien * $FreeBSD: head/lib/libpam/modules/pam_securetty/pam_securetty.c 81475 2001-08-10 19:18:52Z markm $ 2785587Sobrien */ 2885587Sobrien 2985587Sobrien#include <sys/types.h> 3085587Sobrien#include <sys/stat.h> 3185587Sobrien#include <pwd.h> 3285587Sobrien#include <ttyent.h> 3385587Sobrien#include <string.h> 3485587Sobrien 3585587Sobrien#define PAM_SM_AUTH 3685587Sobrien#include <security/pam_modules.h> 3785587Sobrien#include <pam_mod_misc.h> 3885587Sobrien 3985587Sobrien#define TTY_PREFIX "/dev/" 4085587Sobrien 4185587SobrienPAM_EXTERN int 4285587Sobrienpam_sm_authenticate(pam_handle_t * pamh, int flags, int argc, const char **argv) 4385587Sobrien{ 4485587Sobrien struct options options; 4585587Sobrien struct ttyent *ttyfileinfo; 4685587Sobrien struct passwd *pwd; 4785587Sobrien int retval; 4885587Sobrien const char *user, *ttyname; 4985587Sobrien 5085587Sobrien pam_std_option(&options, NULL, argc, argv); 5185587Sobrien 5285587Sobrien PAM_LOG("Options processed"); 5385587Sobrien 5485587Sobrien retval = pam_get_user(pamh, &user, NULL); 5585587Sobrien if (retval != PAM_SUCCESS) 5685587Sobrien PAM_RETURN(retval); 5785587Sobrien 5885587Sobrien PAM_LOG("Got user: %s", user); 5985587Sobrien 6085587Sobrien retval = pam_get_item(pamh, PAM_TTY, (const void **)&ttyname); 6185587Sobrien if (retval != PAM_SUCCESS) 6285587Sobrien PAM_RETURN(retval); 6385587Sobrien 6485587Sobrien PAM_LOG("Got TTY: %s", ttyname); 6585587Sobrien 6685587Sobrien /* Ignore any "/dev/" on the PAM_TTY item */ 6785587Sobrien if (strncmp(TTY_PREFIX, ttyname, sizeof(TTY_PREFIX) - 1) == 0) 6885587Sobrien ttyname += sizeof(TTY_PREFIX) - 1; 6985587Sobrien 7085587Sobrien /* If the user is not root, secure ttys do not apply */ 7185587Sobrien pwd = getpwnam(user); 7285587Sobrien if (pwd == NULL) 7385587Sobrien PAM_RETURN(PAM_IGNORE); 7485587Sobrien else if (pwd->pw_uid != 0) 7585587Sobrien PAM_RETURN(PAM_SUCCESS); 7685587Sobrien 7785587Sobrien PAM_LOG("User is not root"); 7885587Sobrien 7985587Sobrien ttyfileinfo = getttynam(ttyname); 8085587Sobrien if (ttyfileinfo == NULL) 8185587Sobrien PAM_RETURN(PAM_SERVICE_ERR); 8285587Sobrien 8385587Sobrien PAM_LOG("Got ttyfileinfo"); 8485587Sobrien 8585587Sobrien if (ttyfileinfo->ty_status & TTY_SECURE) 8685587Sobrien PAM_RETURN(PAM_SUCCESS); 8785587Sobrien else { 8885587Sobrien PAM_VERBOSE_ERROR("Not on secure TTY"); 8985587Sobrien PAM_RETURN(PAM_PERM_DENIED); 9085587Sobrien } 9185587Sobrien} 9285587Sobrien 9385587SobrienPAM_EXTERN 9485587Sobrienint 9585587Sobrienpam_sm_setcred(pam_handle_t * pamh, int flags, int argc, const char **argv) 9690902Sdes{ 9785587Sobrien struct options options; 9885587Sobrien 9985587Sobrien pam_std_option(&options, NULL, argc, argv); 10085587Sobrien 10185587Sobrien PAM_LOG("Options processed"); 10285587Sobrien 10385587Sobrien PAM_RETURN(PAM_SUCCESS); 10485587Sobrien} 10585587Sobrien 10685587SobrienPAM_MODULE_ENTRY("pam_securetty"); 10785587Sobrien