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