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 Technologies, 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 <pwd.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <syslog.h> 56 #include <time.h> 57 #include <unistd.h> 58 #include <utmp.h> 59 60 #define PAM_SM_AUTH 61 #define PAM_SM_ACCOUNT 62 #define PAM_SM_SESSION 63 #define PAM_SM_PASSWORD 64 65 #include <security/pam_appl.h> 66 #include <security/pam_modules.h> 67 #include <security/pam_mod_misc.h> 68 69 extern int login_access(const char *, const char *); 70 71 PAM_EXTERN int 72 pam_sm_authenticate(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 73 { 74 struct options options; 75 76 pam_std_option(&options, NULL, argc, argv); 77 78 PAM_LOG("Options processed"); 79 80 PAM_RETURN(PAM_IGNORE); 81 } 82 83 PAM_EXTERN int 84 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 85 { 86 struct options options; 87 88 pam_std_option(&options, NULL, argc, argv); 89 90 PAM_LOG("Options processed"); 91 92 PAM_RETURN(PAM_IGNORE); 93 } 94 95 PAM_EXTERN int 96 pam_sm_acct_mgmt(pam_handle_t *pamh __unused, int flags __unused, int argc ,const char **argv) 97 { 98 struct options options; 99 100 pam_std_option(&options, NULL, argc, argv); 101 102 PAM_LOG("Options processed"); 103 104 PAM_RETURN(PAM_IGNORE); 105 } 106 107 PAM_EXTERN int 108 pam_sm_chauthtok(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 109 { 110 struct options options; 111 112 pam_std_option(&options, NULL, argc, argv); 113 114 PAM_LOG("Options processed"); 115 116 PAM_RETURN(PAM_IGNORE); 117 } 118 119 PAM_EXTERN int 120 pam_sm_open_session(pam_handle_t *pamh, int flags, int argc, const char **argv) 121 { 122 struct options options; 123 struct passwd *pwd; 124 struct utmp utmp; 125 struct lastlog ll; 126 const char *rhost, *user, *tty; 127 char *buf; 128 off_t llpos; 129 int fd, pam_err; 130 131 pam_std_option(&options, NULL, argc, argv); 132 133 PAM_LOG("Options processed"); 134 135 pam_err = pam_get_item(pamh, PAM_USER, (const void **)&user); 136 if (pam_err != PAM_SUCCESS) 137 PAM_RETURN(pam_err); 138 if (user == NULL || (pwd = getpwnam(user)) == NULL) 139 PAM_RETURN(PAM_SERVICE_ERR); 140 PAM_LOG("Got user: %s", user); 141 142 pam_err = pam_get_item(pamh, PAM_RHOST, (const void **)&rhost); 143 if (pam_err != PAM_SUCCESS) 144 PAM_RETURN(pam_err); 145 146 pam_err = pam_get_item(pamh, PAM_TTY, (const void **)&tty); 147 if (pam_err != PAM_SUCCESS) 148 PAM_RETURN(pam_err); 149 if (tty == NULL) 150 PAM_RETURN(PAM_SERVICE_ERR); 151 152 fd = open(_PATH_LASTLOG, O_RDWR, 0); 153 if (fd == -1) { 154 syslog(LOG_ERR, "cannot open %s: %m", _PATH_LASTLOG); 155 PAM_RETURN(PAM_SERVICE_ERR); 156 } 157 158 /* 159 * Record session in lastlog(5). 160 */ 161 llpos = (off_t)(pwd->pw_uid * sizeof(ll)); 162 if (lseek(fd, llpos, L_SET) != llpos) 163 goto file_err; 164 if ((flags & PAM_SILENT) == 0) { 165 if (read(fd, &ll, sizeof(ll)) == sizeof(ll) && 166 ll.ll_time != 0) { 167 asprintf(&buf, "Last login: %.*s ", 24 - 5, 168 ctime(&ll.ll_time)); 169 if (buf != NULL) { 170 pam_prompt(pamh, PAM_TEXT_INFO, buf, NULL); 171 free(buf); 172 } 173 if (*ll.ll_host != '\0') 174 asprintf(&buf, "from %.*s\n", 175 (int)sizeof(ll.ll_host), ll.ll_host); 176 else 177 asprintf(&buf, "on %.*s\n", 178 (int)sizeof(ll.ll_line), ll.ll_line); 179 if (buf != NULL) { 180 pam_prompt(pamh, PAM_TEXT_INFO, buf, NULL); 181 free(buf); 182 } 183 } 184 if (lseek(fd, llpos, L_SET) != llpos) 185 goto file_err; 186 } 187 188 bzero(&ll, sizeof(ll)); 189 time(&ll.ll_time); 190 191 /* note: does not need to be NUL-terminated */ 192 strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 193 if (rhost != NULL) 194 /* note: does not need to be NUL-terminated */ 195 strncpy(ll.ll_host, rhost, sizeof(ll.ll_host)); 196 197 if (write(fd, (char *)&ll, sizeof(ll)) != sizeof(ll) || close(fd) != 0) 198 goto file_err; 199 200 PAM_LOG("Login recorded in %s", _PATH_LASTLOG); 201 202 /* 203 * Record session in utmp(5) and wtmp(5). 204 */ 205 bzero(&utmp, sizeof(utmp)); 206 time(&utmp.ut_time); 207 /* note: does not need to be NUL-terminated */ 208 strncpy(utmp.ut_name, user, sizeof(utmp.ut_name)); 209 if (rhost != NULL) 210 strncpy(utmp.ut_host, rhost, sizeof(utmp.ut_host)); 211 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 212 login(&utmp); 213 214 PAM_RETURN(PAM_IGNORE); 215 216 file_err: 217 syslog(LOG_ERR, "%s: %m", _PATH_LASTLOG); 218 close(fd); 219 PAM_RETURN(PAM_SERVICE_ERR); 220 } 221 222 PAM_EXTERN int 223 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv) 224 { 225 struct options options; 226 227 pam_std_option(&options, NULL, argc, argv); 228 229 PAM_LOG("Options processed"); 230 231 PAM_RETURN(PAM_SUCCESS); 232 } 233 234 PAM_MODULE_ENTRY("pam_lastlog"); 235