pam_lastlog.c revision 330897
1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * Copyright (c) 2001 Mark R V Murray 7 * All rights reserved. 8 * Copyright (c) 2001 Networks Associates Technology, Inc. 9 * All rights reserved. 10 * Copyright (c) 2004 Joe R. Doupnik 11 * All rights reserved. 12 * 13 * Portions of this software were developed for the FreeBSD Project by 14 * ThinkSec AS and NAI Labs, the Security Research Division of Network 15 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 16 * ("CBOSS"), as part of the DARPA CHATS research program. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions 20 * are met: 21 * 1. Redistributions of source code must retain the above copyright 22 * notice, this list of conditions and the following disclaimer. 23 * 2. Redistributions in binary form must reproduce the above copyright 24 * notice, this list of conditions and the following disclaimer in the 25 * documentation and/or other materials provided with the distribution. 26 * 3. The name of the author may not be used to endorse or promote 27 * products derived from this software without specific prior written 28 * permission. 29 * 4. Neither the name of the University nor the names of its contributors 30 * may be used to endorse or promote products derived from this software 31 * without specific prior written permission. 32 * 33 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 34 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 35 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 36 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 37 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 38 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 39 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 41 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 42 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 43 * SUCH DAMAGE. 44 */ 45 46#include <sys/cdefs.h> 47__FBSDID("$FreeBSD: stable/11/lib/libpam/modules/pam_lastlog/pam_lastlog.c 330897 2018-03-14 03:19:51Z eadler $"); 48 49#define _BSD_SOURCE 50 51#include <sys/time.h> 52 53#include <paths.h> 54#include <stdlib.h> 55#include <string.h> 56#include <time.h> 57#include <unistd.h> 58#include <utmpx.h> 59 60#define PAM_SM_SESSION 61 62#include <security/pam_appl.h> 63#include <security/pam_modules.h> 64#include <security/pam_mod_misc.h> 65 66#define PAM_UTMPX_ID "utmpx_id" 67 68PAM_EXTERN int 69pam_sm_open_session(pam_handle_t *pamh, int flags, 70 int argc __unused, const char *argv[] __unused) 71{ 72 struct utmpx *utx, utl; 73 time_t t; 74 const char *user; 75 const void *rhost, *tty; 76 char *id; 77 int pam_err; 78 79 pam_err = pam_get_user(pamh, &user, NULL); 80 if (pam_err != PAM_SUCCESS) 81 return (pam_err); 82 if (user == NULL) 83 return (PAM_SERVICE_ERR); 84 PAM_LOG("Got user: %s", user); 85 86 pam_err = pam_get_item(pamh, PAM_RHOST, &rhost); 87 if (pam_err != PAM_SUCCESS) { 88 PAM_LOG("No PAM_RHOST"); 89 goto err; 90 } 91 pam_err = pam_get_item(pamh, PAM_TTY, &tty); 92 if (pam_err != PAM_SUCCESS) { 93 PAM_LOG("No PAM_TTY"); 94 goto err; 95 } 96 if (tty == NULL) { 97 PAM_LOG("No PAM_TTY"); 98 pam_err = PAM_SERVICE_ERR; 99 goto err; 100 } 101 /* Strip /dev/ component. */ 102 if (strncmp(tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0) 103 tty = (const char *)tty + sizeof(_PATH_DEV) - 1; 104 105 if ((flags & PAM_SILENT) == 0) { 106 if (setutxdb(UTXDB_LASTLOGIN, NULL) != 0) { 107 PAM_LOG("Failed to open lastlogin database"); 108 } else { 109 utx = getutxuser(user); 110 if (utx != NULL && utx->ut_type == USER_PROCESS) { 111 t = utx->ut_tv.tv_sec; 112 if (*utx->ut_host != '\0') 113 pam_info(pamh, "Last login: %.*s from %s", 114 24 - 5, ctime(&t), utx->ut_host); 115 else 116 pam_info(pamh, "Last login: %.*s on %s", 117 24 - 5, ctime(&t), utx->ut_line); 118 } 119 endutxent(); 120 } 121 } 122 123 id = malloc(sizeof utl.ut_id); 124 if (id == NULL) { 125 pam_err = PAM_SERVICE_ERR; 126 goto err; 127 } 128 arc4random_buf(id, sizeof utl.ut_id); 129 130 pam_err = pam_set_data(pamh, PAM_UTMPX_ID, id, openpam_free_data); 131 if (pam_err != PAM_SUCCESS) { 132 free(id); 133 goto err; 134 } 135 136 memset(&utl, 0, sizeof utl); 137 utl.ut_type = USER_PROCESS; 138 memcpy(utl.ut_id, id, sizeof utl.ut_id); 139 strncpy(utl.ut_user, user, sizeof utl.ut_user); 140 strncpy(utl.ut_line, tty, sizeof utl.ut_line); 141 if (rhost != NULL) 142 strncpy(utl.ut_host, rhost, sizeof utl.ut_host); 143 utl.ut_pid = getpid(); 144 gettimeofday(&utl.ut_tv, NULL); 145 pututxline(&utl); 146 147 return (PAM_SUCCESS); 148 149err: 150 if (openpam_get_option(pamh, "no_fail")) 151 return (PAM_SUCCESS); 152 return (pam_err); 153} 154 155PAM_EXTERN int 156pam_sm_close_session(pam_handle_t *pamh, int flags __unused, 157 int argc __unused, const char *argv[] __unused) 158{ 159 struct utmpx utl; 160 const void *id; 161 int pam_err; 162 163 pam_err = pam_get_data(pamh, PAM_UTMPX_ID, (const void **)&id); 164 if (pam_err != PAM_SUCCESS) 165 goto err; 166 167 memset(&utl, 0, sizeof utl); 168 utl.ut_type = DEAD_PROCESS; 169 memcpy(utl.ut_id, id, sizeof utl.ut_id); 170 utl.ut_pid = getpid(); 171 gettimeofday(&utl.ut_tv, NULL); 172 pututxline(&utl); 173 174 return (PAM_SUCCESS); 175 176 err: 177 if (openpam_get_option(pamh, "no_fail")) 178 return (PAM_SUCCESS); 179 return (pam_err); 180} 181 182PAM_MODULE_ENTRY("pam_lastlog"); 183