1 /* $NetBSD: pam_securetty.c,v 1.4 2005/04/19 03:15:36 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2001 Mark R V Murray 5 * All rights reserved. 6 * Copyright (c) 2001 Networks Associates Technology, Inc. 7 * All rights reserved. 8 * 9 * Portions of this software were developed for the FreeBSD Project by 10 * ThinkSec AS and NAI Labs, the Security Research Division of Network 11 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 12 * ("CBOSS"), as part of the DARPA CHATS research program. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. The name of the author may not be used to endorse or promote 23 * products derived from this software without specific prior written 24 * permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifdef __FreeBSD__ 41 __FBSDID("$FreeBSD: src/lib/libpam/modules/pam_securetty/pam_securetty.c,v 1.13 2004/02/10 10:13:21 des Exp $"); 42 #else 43 __RCSID("$NetBSD: pam_securetty.c,v 1.4 2005/04/19 03:15:36 christos Exp $"); 44 #endif 45 46 #include <sys/types.h> 47 #include <sys/stat.h> 48 #include <pwd.h> 49 #include <ttyent.h> 50 #include <string.h> 51 52 #define PAM_SM_ACCOUNT 53 54 #include <security/pam_appl.h> 55 #include <security/pam_modules.h> 56 #include <security/pam_mod_misc.h> 57 58 #define TTY_PREFIX "/dev/" 59 60 PAM_EXTERN int 61 pam_sm_acct_mgmt(pam_handle_t *pamh __unused, int flags __unused, 62 int argc __unused, const char *argv[] __unused) 63 { 64 struct passwd *pwd, pwres; 65 struct ttyent *ty; 66 const char *user; 67 const void *tty; 68 int pam_err; 69 char pwbuf[1024]; 70 71 pam_err = pam_get_user(pamh, &user, NULL); 72 if (pam_err != PAM_SUCCESS) 73 return (pam_err); 74 if (user == NULL || 75 getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 || 76 pwd == NULL) 77 return (PAM_SERVICE_ERR); 78 79 PAM_LOG("Got user: %s", user); 80 81 /* If the user is not root, secure ttys do not apply */ 82 if (pwd->pw_uid != 0) 83 return (PAM_SUCCESS); 84 85 pam_err = pam_get_item(pamh, PAM_TTY, &tty); 86 if (pam_err != PAM_SUCCESS) 87 return (pam_err); 88 89 PAM_LOG("Got TTY: %s", (const char *)tty); 90 91 /* Ignore any "/dev/" on the PAM_TTY item */ 92 if (tty != NULL && strncmp(TTY_PREFIX, tty, sizeof(TTY_PREFIX)) == 0) { 93 PAM_LOG("WARNING: PAM_TTY starts with " TTY_PREFIX); 94 tty = (const char *)tty + sizeof(TTY_PREFIX) - 1; 95 } 96 97 if (tty != NULL && (ty = getttynam(tty)) != NULL && 98 (ty->ty_status & TTY_SECURE) != 0) 99 return (PAM_SUCCESS); 100 101 PAM_VERBOSE_ERROR("Not on secure TTY"); 102 return (PAM_AUTH_ERR); 103 } 104 105 PAM_MODULE_ENTRY("pam_securetty"); 106