1 /* $NetBSD: pam_securetty.c,v 1.7 2006/11/03 18:55:40 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 1.7 2006/11/03 18:55:40 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 #include <syslog.h> 52 53 #define PAM_SM_ACCOUNT 54 55 #include <security/pam_appl.h> 56 #include <security/pam_modules.h> 57 #include <security/pam_mod_misc.h> 58 59 #define TTY_PREFIX "/dev/" 60 61 PAM_EXTERN int 62 pam_sm_acct_mgmt(pam_handle_t *pamh __unused, int flags __unused, 63 int argc __unused, const char *argv[] __unused) 64 { 65 struct passwd *pwd, pwres; 66 struct ttyent *ty; 67 const char *user; 68 const void *tty; 69 const void *hostname; 70 int pam_err; 71 char pwbuf[1024]; 72 struct syslog_data data = SYSLOG_DATA_INIT; 73 74 pam_err = pam_get_user(pamh, &user, NULL); 75 if (pam_err != PAM_SUCCESS) 76 return (pam_err); 77 if (user == NULL || 78 getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 || 79 pwd == NULL) 80 return (PAM_SERVICE_ERR); 81 82 PAM_LOG("Got user: %s", user); 83 84 /* If the user is not root, secure ttys do not apply */ 85 if (pwd->pw_uid != 0) 86 return (PAM_SUCCESS); 87 88 pam_err = pam_get_item(pamh, PAM_TTY, &tty); 89 if (pam_err != PAM_SUCCESS) 90 return (pam_err); 91 92 PAM_LOG("Got TTY: %s", (const char *)tty); 93 94 /* Ignore any "/dev/" on the PAM_TTY item */ 95 if (tty != NULL && strncmp(TTY_PREFIX, tty, sizeof(TTY_PREFIX)) == 0) { 96 PAM_LOG("WARNING: PAM_TTY starts with " TTY_PREFIX); 97 tty = (const char *)tty + sizeof(TTY_PREFIX) - 1; 98 } 99 100 if (tty != NULL && (ty = getttynam(tty)) != NULL && 101 (ty->ty_status & TTY_SECURE) != 0) 102 return (PAM_SUCCESS); 103 104 pam_err = pam_get_item(pamh, PAM_RHOST, &hostname); 105 if (pam_err != PAM_SUCCESS) 106 hostname = NULL; 107 108 openlog_r("pam_securetty", LOG_PID, LOG_AUTHPRIV, &data); 109 if (hostname) 110 syslog_r(LOG_NOTICE, &data, 111 "LOGIN %s REFUSED FROM %s ON TTY %s", 112 pwd->pw_name, (const char *)hostname, 113 (const char *)tty); 114 else 115 syslog_r(LOG_NOTICE, &data, 116 "LOGIN %s REFUSED ON TTY %s", 117 pwd->pw_name, (const char *)tty); 118 closelog_r(&data); 119 120 121 PAM_VERBOSE_ERROR("Not on secure TTY"); 122 return (PAM_AUTH_ERR); 123 } 124 125 PAM_MODULE_ENTRY("pam_securetty"); 126