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 * Copyright (c) 2004 Joe R. Doupnik 9 * All rights reserved. 10 * 11 * Portions of this software were developed for the FreeBSD Project by 12 * ThinkSec AS and NAI Labs, the Security Research Division of Network 13 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 14 * ("CBOSS"), as part of the DARPA CHATS research program. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 2. Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 3. The name of the author may not be used to endorse or promote 25 * products derived from this software without specific prior written 26 * permission. 27 * 4. Neither the name of the University nor the names of its contributors 28 * may be used to endorse or promote products derived from this software 29 * without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 34 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 41 * SUCH DAMAGE. 42 * 43 * $FreeBSD: src/lib/libpam/modules/pam_lastlog/pam_lastlog.c,v 1.23 2007/07/22 15:17:29 des Exp $ 44 */ 45 46 #define _BSD_SOURCE 47 48 #include <sys/param.h> 49 50 #include <fcntl.h> 51 #include <libutil.h> 52 #include <paths.h> 53 #include <pwd.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <syslog.h> 58 #include <time.h> 59 #include <unistd.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 #define SUPPORT_UTMP 1 68 #define SUPPORT_UTMPX 1 69 70 #ifdef SUPPORT_UTMP 71 #include <utmp.h> 72 static void doutmp(const char *, const char *, const char *, 73 const struct timeval *); 74 static void dolastlog(pam_handle_t *, int, const struct passwd *, const char *, 75 const char *, const struct timeval *); 76 #endif 77 78 #ifdef SUPPORT_UTMPX 79 #include <utmpx.h> 80 static void doutmpx(const char *, const char *, const char *, 81 const struct sockaddr_storage *ss, const struct timeval *); 82 static void dolastlogx(pam_handle_t *, int, const struct passwd *, const char *, 83 const char *, const struct sockaddr_storage *ss, const struct timeval *); 84 #endif 85 86 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 87 static void domsg(pam_handle_t *, time_t, const char *, size_t, const char *, 88 size_t); 89 #endif 90 91 static void logit(int, const char *, ...) __printflike(2, 3); 92 93 static void 94 logit(int level, const char *fmt, ...) 95 { 96 va_list ap; 97 98 openlog("pam_lastlog", LOG_PID, LOG_AUTHPRIV); 99 va_start(ap, fmt); 100 vsyslog(level, fmt, ap); 101 va_end(ap); 102 closelog(); 103 } 104 105 106 PAM_EXTERN int 107 pam_sm_open_session(pam_handle_t *pamh, int flags, 108 int argc __unused, const char *argv[] __unused) 109 { 110 struct passwd *pwd, pwres; 111 struct timeval now; 112 const char *user, *rhost, *tty; 113 const void *vrhost, *vtty; 114 int pam_err; 115 int quiet; 116 char pwbuf[1024]; 117 #ifdef LOGIN_CAP 118 login_cap_t *lc; 119 #endif 120 121 pam_err = pam_get_user(pamh, &user, NULL); 122 if (pam_err != PAM_SUCCESS) 123 return pam_err; 124 125 if (user == NULL || 126 getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 || 127 pwd == NULL) 128 return PAM_SERVICE_ERR; 129 130 PAM_LOG("Got user: %s", user); 131 132 pam_err = pam_get_item(pamh, PAM_RHOST, &vrhost); 133 if (pam_err != PAM_SUCCESS) 134 goto err; 135 rhost = (const char *)vrhost; 136 137 pam_err = pam_get_item(pamh, PAM_TTY, &vtty); 138 if (pam_err != PAM_SUCCESS) 139 goto err; 140 tty = (const char *)vtty; 141 142 if (tty == NULL) { 143 pam_err = PAM_SERVICE_ERR; 144 goto err; 145 } 146 147 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 148 tty = tty + strlen(_PATH_DEV); 149 150 if (*tty == '\0') { 151 pam_err = PAM_SERVICE_ERR; 152 goto err; 153 } 154 155 (void)gettimeofday(&now, NULL); 156 157 if ((flags & PAM_SILENT) != 0) 158 quiet = 1; 159 else { 160 #ifdef LOGIN_CAP 161 lc = login_getpwclass(pwd); 162 quiet = login_getcapbool(lc, "hushlogin", 0); 163 login_close(lc); 164 #else 165 quiet = 0; 166 #endif 167 } 168 #ifdef SUPPORT_UTMPX 169 dolastlogx(pamh, quiet, pwd, rhost, tty, NULL, &now); 170 doutmpx(user, rhost, tty, NULL, &now); 171 quiet = 1; 172 #endif 173 #ifdef SUPPORT_UTMP 174 doutmp(user, rhost, tty, &now); 175 dolastlog(pamh, quiet, pwd, rhost, tty, &now); 176 #endif 177 err: 178 if (openpam_get_option(pamh, "no_fail")) 179 return PAM_SUCCESS; 180 return pam_err; 181 } 182 183 PAM_EXTERN int 184 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, 185 int argc __unused, const char *argv[] __unused) 186 { 187 const void *vtty; 188 const char *tty; 189 190 pam_get_item(pamh, PAM_TTY, &vtty); 191 if (vtty == NULL) 192 return PAM_SERVICE_ERR; 193 tty = (const char *)vtty; 194 195 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 196 tty = tty + strlen(_PATH_DEV); 197 198 if (*tty == '\0') 199 return PAM_SERVICE_ERR; 200 201 #ifdef SUPPORT_UTMPX 202 if (logoutx(tty, 0, DEAD_PROCESS)) 203 logwtmpx(tty, "", "", 0, DEAD_PROCESS); 204 else 205 logit(LOG_NOTICE, "%s(): no utmpx record for %s", 206 __func__, tty); 207 #endif 208 209 #ifdef SUPPORT_UTMP 210 if (logout(tty)) 211 logwtmp(tty, "", ""); 212 else 213 logit(LOG_NOTICE, "%s(): no utmp record for %s", 214 __func__, tty); 215 #endif 216 return PAM_SUCCESS; 217 } 218 219 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 220 static void 221 domsg(pam_handle_t *pamh, time_t t, const char *host, size_t hsize, 222 const char *line, size_t lsize) 223 { 224 char buf[MAXHOSTNAMELEN + 32], *promptresp = NULL; 225 int pam_err; 226 227 if (*host) { 228 (void)snprintf(buf, sizeof(buf), "from %.*s ", 229 (int)hsize, host); 230 host = buf; 231 } 232 233 pam_err = pam_prompt(pamh, PAM_TEXT_INFO, &promptresp, 234 "Last login: %.24s %son %.*s\n", ctime(&t), host, (int)lsize, line); 235 236 if (pam_err == PAM_SUCCESS && promptresp) 237 free(promptresp); 238 } 239 #endif 240 241 #ifdef SUPPORT_UTMPX 242 static void 243 doutmpx(const char *username, const char *hostname, const char *tty, 244 const struct sockaddr_storage *ss, const struct timeval *now) 245 { 246 struct utmpx utmpx; 247 const char *t; 248 249 memset((void *)&utmpx, 0, sizeof(utmpx)); 250 utmpx.ut_tv = *now; 251 (void)strncpy(utmpx.ut_name, username, sizeof(utmpx.ut_name)); 252 if (hostname) { 253 (void)strncpy(utmpx.ut_host, hostname, sizeof(utmpx.ut_host)); 254 if (ss) 255 utmpx.ut_ss = *ss; 256 } 257 (void)strncpy(utmpx.ut_line, tty, sizeof(utmpx.ut_line)); 258 utmpx.ut_type = USER_PROCESS; 259 utmpx.ut_pid = getpid(); 260 t = tty + strlen(tty); 261 if ((size_t)(t - tty) >= sizeof(utmpx.ut_id)) { 262 (void)strncpy(utmpx.ut_id, t - sizeof(utmpx.ut_id), 263 sizeof(utmpx.ut_id)); 264 } else { 265 (void)strncpy(utmpx.ut_id, tty, sizeof(utmpx.ut_id)); 266 } 267 if (pututxline(&utmpx) == NULL) 268 logit(LOG_NOTICE, "Cannot update utmpx %m"); 269 endutxent(); 270 if (_updwtmpx(_PATH_WTMPX, &utmpx) != 0) 271 logit(LOG_NOTICE, "Cannot update wtmpx %m"); 272 } 273 274 static void 275 dolastlogx(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 276 const char *hostname __unused, const char *tty __unused, 277 const struct sockaddr_storage *ss __unused, 278 const struct timeval *now __unused) 279 { 280 struct lastlogx ll; 281 if (!quiet) { 282 if (getlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != NULL) 283 domsg(pamh, (time_t)ll.ll_tv.tv_sec, ll.ll_host, 284 sizeof(ll.ll_host), ll.ll_line, 285 sizeof(ll.ll_line)); 286 } 287 #if 0 288 ll.ll_tv = *now; 289 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 290 291 if (hostname) 292 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 293 else 294 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 295 296 if (ss) 297 ll.ll_ss = *ss; 298 else 299 (void)memset(&ll.ll_ss, 0, sizeof(ll.ll_ss)); 300 301 if (updlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != 0) 302 logit(LOG_NOTICE, "Cannot update lastlogx %m"); 303 PAM_LOG("Login recorded in %s", _PATH_LASTLOGX); 304 #endif 305 } 306 #endif 307 308 #ifdef SUPPORT_UTMP 309 static void 310 doutmp(const char *username, const char *hostname, const char *tty, 311 const struct timeval *now) 312 { 313 struct utmp utmp; 314 315 (void)memset((void *)&utmp, 0, sizeof(utmp)); 316 utmp.ut_time = now->tv_sec; 317 (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); 318 if (hostname) 319 (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); 320 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 321 login(&utmp); 322 } 323 324 static void 325 dolastlog(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 326 const char *hostname, const char *tty, const struct timeval *now) 327 { 328 struct lastlog ll; 329 int fd; 330 331 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) == -1) { 332 logit(LOG_NOTICE, "Cannot open `%s' %m", _PATH_LASTLOG); 333 return; 334 } 335 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 336 337 if (!quiet) { 338 if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && 339 ll.ll_time != 0) 340 domsg(pamh, ll.ll_time, ll.ll_host, 341 sizeof(ll.ll_host), ll.ll_line, 342 sizeof(ll.ll_line)); 343 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 344 } 345 346 ll.ll_time = now->tv_sec; 347 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 348 349 if (hostname) 350 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 351 else 352 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 353 354 (void)write(fd, &ll, sizeof(ll)); 355 (void)close(fd); 356 357 PAM_LOG("Login recorded in %s", _PATH_LASTLOG); 358 } 359 #endif 360 361 PAM_MODULE_ENTRY("pam_lastlog"); 362