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 const char *rhost, *user, *tty; 75 off_t llpos; 76 int fd, pam_err; 77 78 pam_err = pam_get_user(pamh, &user, NULL); 79 if (pam_err != PAM_SUCCESS) 80 return (pam_err); 81 if (user == NULL || (pwd = getpwnam(user)) == NULL) 82 return (PAM_SERVICE_ERR); 83 PAM_LOG("Got user: %s", user); 84 85 pam_err = pam_get_item(pamh, PAM_RHOST, (const void **)&rhost); 86 if (pam_err != PAM_SUCCESS) 87 goto err; 88 pam_err = pam_get_item(pamh, PAM_TTY, (const void **)&tty); 89 if (pam_err != PAM_SUCCESS) 90 goto err; 91 if (tty == NULL) { 92 pam_err = PAM_SERVICE_ERR; 93 goto err; 94 } 95 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 96 tty += strlen(_PATH_DEV); 97 if (*tty == '\0') 98 return (PAM_SERVICE_ERR); 99 100 fd = open(_PATH_LASTLOG, O_RDWR|O_CREAT, 0644); 101 if (fd == -1) 102 goto file_err; 103 104 /* 105 * Record session in lastlog(5). 106 */ 107 llpos = (off_t)(pwd->pw_uid * sizeof(ll)); 108 if (lseek(fd, llpos, L_SET) != llpos) 109 goto file_err; 110 if ((flags & PAM_SILENT) == 0) { 111 if (read(fd, &ll, sizeof ll) == sizeof ll && ll.ll_time != 0) { 112 if (*ll.ll_host != '\0') 113 pam_info(pamh, "Last login: %.*s from %.*s", 114 24 - 5, ctime(&ll.ll_time), 115 (int)sizeof(ll.ll_host), ll.ll_host); 116 else 117 pam_info(pamh, "Last login: %.*s on %.*s", 118 24 - 5, ctime(&ll.ll_time), 119 (int)sizeof(ll.ll_line), ll.ll_line); 120 } 121 if (lseek(fd, llpos, L_SET) != llpos) 122 goto file_err; 123 } 124 125 bzero(&ll, sizeof(ll)); 126 time(&ll.ll_time); 127 128 /* note: does not need to be NUL-terminated */ 129 strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 130 if (rhost != NULL) 131 /* note: does not need to be NUL-terminated */ 132 strncpy(ll.ll_host, rhost, sizeof(ll.ll_host)); 133 134 if (write(fd, (char *)&ll, sizeof(ll)) != sizeof(ll) || close(fd) != 0) 135 goto file_err; 136 137 PAM_LOG("Login recorded in %s", _PATH_LASTLOG); 138 139 /* 140 * Record session in utmp(5) and wtmp(5). 141 */ 142 bzero(&utmp, sizeof(utmp)); 143 time(&utmp.ut_time); 144 /* note: does not need to be NUL-terminated */ 145 strncpy(utmp.ut_name, user, sizeof(utmp.ut_name)); 146 if (rhost != NULL) 147 strncpy(utmp.ut_host, rhost, sizeof(utmp.ut_host)); 148 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 149 login(&utmp); 150 151 return (PAM_SUCCESS); 152 153 file_err: 154 syslog(LOG_ERR, "%s: %m", _PATH_LASTLOG); 155 if (fd != -1) 156 close(fd); 157 pam_err = PAM_SYSTEM_ERR; 158 err: 159 if (openpam_get_option(pamh, "no_fail")) 160 return (PAM_SUCCESS); 161 return (pam_err); 162 } 163 164 PAM_EXTERN int 165 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, 166 int argc __unused, const char *argv[] __unused) 167 { 168 169 return (PAM_SUCCESS); 170 } 171 172 PAM_MODULE_ENTRY("pam_lastlog"); 173