1 /*- 2 * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 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 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 */ 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #define _BSD_SOURCE 46 47 #include <sys/param.h> 48 49 #include <fcntl.h> 50 #include <libutil.h> 51 #include <paths.h> 52 #include <pwd.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <syslog.h> 57 #include <time.h> 58 #include <unistd.h> 59 #include <utmp.h> 60 61 #define PAM_SM_SESSION 62 63 #include <security/pam_appl.h> 64 #include <security/pam_modules.h> 65 #include <security/pam_mod_misc.h> 66 67 PAM_EXTERN int 68 pam_sm_open_session(pam_handle_t *pamh, int flags, 69 int argc __unused, const char *argv[] __unused) 70 { 71 struct passwd *pwd; 72 struct utmp utmp; 73 struct lastlog ll; 74 time_t t; 75 const char *rhost, *user, *tty; 76 off_t llpos; 77 int fd, 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 || (pwd = getpwnam(user)) == NULL) 83 return (PAM_SERVICE_ERR); 84 PAM_LOG("Got user: %s", user); 85 86 pam_err = pam_get_item(pamh, PAM_RHOST, (const void **)&rhost); 87 if (pam_err != PAM_SUCCESS) 88 goto err; 89 pam_err = pam_get_item(pamh, PAM_TTY, (const void **)&tty); 90 if (pam_err != PAM_SUCCESS) 91 goto err; 92 if (tty == NULL) { 93 pam_err = PAM_SERVICE_ERR; 94 goto err; 95 } 96 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 97 tty += strlen(_PATH_DEV); 98 if (*tty == '\0') 99 return (PAM_SERVICE_ERR); 100 101 fd = open(_PATH_LASTLOG, O_RDWR|O_CREAT, 0644); 102 if (fd == -1) 103 goto file_err; 104 105 /* 106 * Record session in lastlog(5). 107 */ 108 llpos = (off_t)(pwd->pw_uid * sizeof(ll)); 109 if (lseek(fd, llpos, L_SET) != llpos) 110 goto file_err; 111 if ((flags & PAM_SILENT) == 0) { 112 if (read(fd, &ll, sizeof ll) == sizeof ll && ll.ll_time != 0) { 113 t = ll.ll_time; 114 if (*ll.ll_host != '\0') 115 pam_info(pamh, "Last login: %.*s from %.*s", 116 24 - 5, ctime(&t), 117 (int)sizeof(ll.ll_host), ll.ll_host); 118 else 119 pam_info(pamh, "Last login: %.*s on %.*s", 120 24 - 5, ctime(&t), 121 (int)sizeof(ll.ll_line), ll.ll_line); 122 } 123 if (lseek(fd, llpos, L_SET) != llpos) 124 goto file_err; 125 } 126 127 bzero(&ll, sizeof(ll)); 128 ll.ll_time = time(NULL); 129 130 /* note: does not need to be NUL-terminated */ 131 strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 132 if (rhost != NULL && *rhost != '\0') 133 /* note: does not need to be NUL-terminated */ 134 strncpy(ll.ll_host, rhost, sizeof(ll.ll_host)); 135 136 if (write(fd, (char *)&ll, sizeof(ll)) != sizeof(ll) || close(fd) != 0) 137 goto file_err; 138 139 PAM_LOG("Login recorded in %s", _PATH_LASTLOG); 140 141 /* 142 * Record session in utmp(5) and wtmp(5). 143 */ 144 bzero(&utmp, sizeof(utmp)); 145 utmp.ut_time = time(NULL); 146 /* note: does not need to be NUL-terminated */ 147 strncpy(utmp.ut_name, user, sizeof(utmp.ut_name)); 148 if (rhost != NULL && *rhost != '\0') 149 strncpy(utmp.ut_host, rhost, sizeof(utmp.ut_host)); 150 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 151 login(&utmp); 152 153 return (PAM_SUCCESS); 154 155 file_err: 156 syslog(LOG_ERR, "%s: %m", _PATH_LASTLOG); 157 if (fd != -1) 158 close(fd); 159 pam_err = PAM_SYSTEM_ERR; 160 err: 161 if (openpam_get_option(pamh, "no_fail")) 162 return (PAM_SUCCESS); 163 return (pam_err); 164 } 165 166 PAM_EXTERN int 167 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, 168 int argc __unused, const char *argv[] __unused) 169 { 170 171 return (PAM_SUCCESS); 172 } 173 174 PAM_MODULE_ENTRY("pam_lastlog"); 175