pam_lastlog.c revision 1.4
1 /* $NetBSD: pam_lastlog.c,v 1.4 2005/02/04 15:11:35 he Exp $ */ 2 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 #ifdef __FreeBSD__ 48 __FBSDID("$FreeBSD: src/lib/libpam/modules/pam_lastlog/pam_lastlog.c,v 1.20 2004/01/26 19:28:37 des Exp $"); 49 #else 50 __RCSID("$NetBSD: pam_lastlog.c,v 1.4 2005/02/04 15:11:35 he Exp $"); 51 #endif 52 53 #include <sys/param.h> 54 55 #include <fcntl.h> 56 #include <util.h> 57 #include <paths.h> 58 #include <pwd.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <syslog.h> 63 #include <time.h> 64 #include <unistd.h> 65 66 #ifdef SUPPORT_UTMP 67 #include <utmp.h> 68 static void doutmp(const char *, const char *, const char *, 69 const struct timeval *); 70 static void dolastlog(int, const struct passwd *, const char *, const char *, 71 const struct timeval *); 72 #endif 73 74 #ifdef SUPPORT_UTMPX 75 #include <utmpx.h> 76 static void doutmpx(const char *, const char *, const char *, 77 const struct sockaddr_storage *ss, const struct timeval *); 78 static void dolastlogx(int, const struct passwd *, const char *, const char *, 79 const struct sockaddr_storage *ss, const struct timeval *); 80 #endif 81 82 #define PAM_SM_SESSION 83 84 #include <security/pam_appl.h> 85 #include <security/pam_modules.h> 86 #include <security/pam_mod_misc.h> 87 88 PAM_EXTERN int 89 pam_sm_open_session(pam_handle_t *pamh, int flags, 90 int argc __unused, const char *argv[] __unused) 91 { 92 struct passwd *pwd; 93 struct timeval now; 94 const char *user, *rhost, *tty; 95 const void *vrhost, *vtty, *vss; 96 const struct sockaddr_storage *ss; 97 int pam_err; 98 99 pam_err = pam_get_user(pamh, &user, NULL); 100 if (pam_err != PAM_SUCCESS) 101 return pam_err; 102 103 if (user == NULL || (pwd = getpwnam(user)) == NULL) 104 return PAM_SERVICE_ERR; 105 106 PAM_LOG("Got user: %s", user); 107 108 pam_err = pam_get_item(pamh, PAM_RHOST, &vrhost); 109 if (pam_err != PAM_SUCCESS) 110 goto err; 111 rhost = (const char *)vrhost; 112 113 pam_err = pam_get_item(pamh, PAM_SOCKADDR, &vss); 114 if (pam_err != PAM_SUCCESS) 115 goto err; 116 ss = (const struct sockaddr_storage *)vss; 117 118 pam_err = pam_get_item(pamh, PAM_TTY, &vtty); 119 if (pam_err != PAM_SUCCESS) 120 goto err; 121 tty = (const char *)vtty; 122 123 if (tty == NULL) { 124 pam_err = PAM_SERVICE_ERR; 125 goto err; 126 } 127 128 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 129 tty = tty + strlen(_PATH_DEV); 130 131 if (*tty == '\0') { 132 pam_err = PAM_SERVICE_ERR; 133 goto err; 134 } 135 136 (void)gettimeofday(&now, NULL); 137 138 #ifdef SUPPORT_UTMPX 139 doutmpx(user, rhost, tty, ss, &now); 140 dolastlogx(1, pwd, rhost, tty, ss, &now); 141 #endif 142 #ifdef SUPPORT_UTMP 143 doutmp(user, rhost, tty, &now); 144 dolastlog(1, pwd, rhost, tty, &now); 145 #endif 146 err: 147 if (openpam_get_option(pamh, "no_fail")) 148 return PAM_SUCCESS; 149 return pam_err; 150 } 151 152 PAM_EXTERN int 153 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, 154 int argc __unused, const char *argv[] __unused) 155 { 156 const void *vtty; 157 const char *tty; 158 159 pam_get_item(pamh, PAM_TTY, &vtty); 160 if (vtty == NULL) 161 return PAM_SERVICE_ERR; 162 tty = (const char *)vtty; 163 164 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 165 tty = tty + strlen(_PATH_DEV); 166 167 if (*tty == '\0') 168 return PAM_SERVICE_ERR; 169 170 #ifdef SUPPORT_UTMPX 171 if (logoutx(tty, 0, DEAD_PROCESS)) 172 logwtmpx(tty, "", "", 0, DEAD_PROCESS); 173 else 174 syslog(LOG_NOTICE, "%s(): no utmpx record for %s", 175 __func__, tty); 176 #endif 177 178 #ifdef SUPPORT_UTMP 179 if (logout(tty)) 180 logwtmp(tty, "", ""); 181 else 182 syslog(LOG_NOTICE, "%s(): no utmp record for %s", 183 __func__, tty); 184 #endif 185 return PAM_SUCCESS; 186 } 187 188 #ifdef SUPPORT_UTMPX 189 static void 190 doutmpx(const char *username, const char *hostname, const char *tty, 191 const struct sockaddr_storage *ss, const struct timeval *now) 192 { 193 struct utmpx utmpx; 194 const char *t; 195 196 memset((void *)&utmpx, 0, sizeof(utmpx)); 197 utmpx.ut_tv = *now; 198 (void)strncpy(utmpx.ut_name, username, sizeof(utmpx.ut_name)); 199 if (hostname) { 200 (void)strncpy(utmpx.ut_host, hostname, sizeof(utmpx.ut_host)); 201 if (ss) 202 utmpx.ut_ss = *ss; 203 } 204 (void)strncpy(utmpx.ut_line, tty, sizeof(utmpx.ut_line)); 205 utmpx.ut_type = USER_PROCESS; 206 utmpx.ut_pid = getpid(); 207 t = tty + strlen(tty); 208 if (t - tty >= sizeof(utmpx.ut_id)) { 209 (void)strncpy(utmpx.ut_id, t - sizeof(utmpx.ut_id), 210 sizeof(utmpx.ut_id)); 211 } else { 212 (void)strncpy(utmpx.ut_id, tty, sizeof(utmpx.ut_id)); 213 } 214 if (pututxline(&utmpx) == NULL) 215 syslog(LOG_NOTICE, "Cannot update utmpx %m"); 216 endutxent(); 217 if (updwtmpx(_PATH_WTMPX, &utmpx) != 0) 218 syslog(LOG_NOTICE, "Cannot update wtmpx %m"); 219 } 220 221 static void 222 dolastlogx(int quiet, const struct passwd *pwd, const char *hostname, 223 const char *tty, const struct sockaddr_storage *ss, 224 const struct timeval *now) 225 { 226 struct lastlogx ll; 227 if (getlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != NULL) { 228 time_t t = (time_t)ll.ll_tv.tv_sec; 229 if (!quiet) { 230 (void)printf("Last login: %.24s ", ctime(&t)); 231 if (*ll.ll_host != '\0') 232 (void)printf("from %.*s ", 233 (int)sizeof(ll.ll_host), ll.ll_host); 234 (void)printf("on %.*s\n", (int)sizeof(ll.ll_line), 235 ll.ll_line); 236 } 237 } 238 ll.ll_tv = *now; 239 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 240 if (hostname) { 241 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 242 if (ss) 243 ll.ll_ss = *ss; 244 } 245 if (updlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != 0) 246 syslog(LOG_NOTICE, "Cannot update lastlogx %m"); 247 PAM_LOG("Login recorded in %s", _PATH_LASTLOGX); 248 } 249 #endif 250 251 #ifdef SUPPORT_UTMP 252 static void 253 doutmp(const char *username, const char *hostname, const char *tty, 254 const struct timeval *now) 255 { 256 struct utmp utmp; 257 258 (void)memset((void *)&utmp, 0, sizeof(utmp)); 259 utmp.ut_time = now->tv_sec; 260 (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); 261 if (hostname) 262 (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); 263 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 264 login(&utmp); 265 } 266 267 static void 268 dolastlog(int quiet, const struct passwd *pwd, const char *hostname, 269 const char *tty, const struct timeval *now) 270 { 271 struct lastlog ll; 272 int fd; 273 274 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) { 275 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 276 if (!quiet) { 277 if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && 278 ll.ll_time != 0) { 279 (void)printf("Last login: %.24s ", 280 ctime(&ll.ll_time)); 281 if (*ll.ll_host != '\0') 282 (void)printf("from %.*s ", 283 (int)sizeof(ll.ll_host), 284 ll.ll_host); 285 (void)printf("on %.*s\n", 286 (int)sizeof(ll.ll_line), ll.ll_line); 287 } 288 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), 289 SEEK_SET); 290 } 291 (void)memset((void *)&ll, 0, sizeof(ll)); 292 ll.ll_time = now->tv_sec; 293 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 294 if (hostname) 295 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 296 (void)write(fd, (char *)&ll, sizeof(ll)); 297 (void)close(fd); 298 } 299 PAM_LOG("Login recorded in %s", _PATH_LASTLOG); 300 } 301 #endif 302 303 PAM_MODULE_ENTRY("pam_lastlog"); 304
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