1 /* $NetBSD: pam_lastlog.c,v 1.15 2014/01/07 02:07:43 joerg 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 1.15 2014/01/07 02:07:43 joerg 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 <errno.h> 64 #include <time.h> 65 #include <unistd.h> 66 #include <stdarg.h> 67 #ifdef LOGIN_CAP 68 #include <login_cap.h> 69 #endif 70 71 #define PAM_SM_SESSION 72 73 #include <security/pam_appl.h> 74 #include <security/pam_modules.h> 75 #include <security/pam_mod_misc.h> 76 77 #ifdef SUPPORT_UTMP 78 #include <utmp.h> 79 static void doutmp(const char *, const char *, const char *, 80 const struct timeval *); 81 static void dolastlog(pam_handle_t *, int, const struct passwd *, const char *, 82 const char *, const struct timeval *); 83 #endif 84 85 #ifdef SUPPORT_UTMPX 86 #include <utmpx.h> 87 static void doutmpx(const char *, const char *, const char *, 88 const struct sockaddr_storage *ss, const struct timeval *); 89 static void dolastlogx(pam_handle_t *, int, const struct passwd *, const char *, 90 const char *, const struct sockaddr_storage *ss, const struct timeval *); 91 #endif 92 93 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 94 static void domsg(pam_handle_t *, time_t, const char *, size_t, const char *, 95 size_t); 96 #endif 97 98 __printflike(2, 3) 99 static void 100 logit(int level, const char *fmt, ...) 101 { 102 va_list ap; 103 struct syslog_data data = SYSLOG_DATA_INIT; 104 105 openlog_r("pam_lastlog", LOG_PID, LOG_AUTHPRIV, &data); 106 va_start(ap, fmt); 107 vsyslog_r(level, &data, fmt, ap); 108 va_end(ap); 109 closelog_r(&data); 110 } 111 112 113 PAM_EXTERN int 114 pam_sm_open_session(pam_handle_t *pamh, int flags, 115 int argc __unused, const char *argv[] __unused) 116 { 117 struct passwd *pwd, pwres; 118 struct timeval now; 119 const char *user, *rhost, *tty, *nuser; 120 const void *vrhost, *vtty, *vss, *vnuser; 121 const struct sockaddr_storage *ss; 122 int pam_err; 123 char pwbuf[1024]; 124 #ifdef LOGIN_CAP 125 login_cap_t *lc; 126 #endif 127 128 pam_err = pam_get_user(pamh, &user, NULL); 129 if (pam_err != PAM_SUCCESS) 130 return pam_err; 131 132 if (user == NULL || 133 getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 || 134 pwd == NULL) 135 return PAM_SERVICE_ERR; 136 137 PAM_LOG("Got user: %s", user); 138 139 pam_err = pam_get_item(pamh, PAM_RHOST, &vrhost); 140 if (pam_err != PAM_SUCCESS) 141 goto err; 142 rhost = (const char *)vrhost; 143 144 pam_err = pam_get_item(pamh, PAM_SOCKADDR, &vss); 145 if (pam_err != PAM_SUCCESS) 146 goto err; 147 ss = (const struct sockaddr_storage *)vss; 148 149 pam_err = pam_get_item(pamh, PAM_TTY, &vtty); 150 if (pam_err != PAM_SUCCESS) 151 goto err; 152 tty = (const char *)vtty; 153 154 if (tty == NULL) { 155 pam_err = PAM_SERVICE_ERR; 156 goto err; 157 } 158 159 if (pam_get_item(pamh, PAM_NUSER, &vnuser) != PAM_SUCCESS) 160 nuser = NULL; 161 else 162 nuser = (const char *)vnuser; 163 164 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 165 tty = tty + strlen(_PATH_DEV); 166 167 if (*tty == '\0') { 168 pam_err = PAM_SERVICE_ERR; 169 goto err; 170 } 171 172 (void)gettimeofday(&now, NULL); 173 174 if (openpam_get_option(pamh, "no_nested") == NULL || nuser == NULL) { 175 int quiet; 176 if ((flags & PAM_SILENT) != 0) 177 quiet = 1; 178 else { 179 #ifdef LOGIN_CAP 180 lc = login_getpwclass(pwd); 181 quiet = login_getcapbool(lc, "hushlogin", 0); 182 login_close(lc); 183 #else 184 quiet = 0; 185 #endif 186 } 187 #ifdef SUPPORT_UTMPX 188 doutmpx(user, rhost, tty, ss, &now); 189 dolastlogx(pamh, quiet, pwd, rhost, tty, ss, &now); 190 quiet = 1; 191 #endif 192 #ifdef SUPPORT_UTMP 193 doutmp(user, rhost, tty, &now); 194 dolastlog(pamh, quiet, pwd, rhost, tty, &now); 195 #endif 196 } 197 err: 198 if (openpam_get_option(pamh, "no_fail")) 199 return PAM_SUCCESS; 200 return pam_err; 201 } 202 203 PAM_EXTERN int 204 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, 205 int argc __unused, const char *argv[] __unused) 206 { 207 const void *vtty, *vnuser; 208 const char *tty, *nuser; 209 210 if (pam_get_item(pamh, PAM_NUSER, &vnuser) != PAM_SUCCESS) 211 nuser = NULL; 212 else 213 nuser = (const char *)vnuser; 214 215 pam_get_item(pamh, PAM_TTY, &vtty); 216 if (vtty == NULL) 217 return PAM_SERVICE_ERR; 218 tty = (const char *)vtty; 219 220 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 221 tty = tty + strlen(_PATH_DEV); 222 223 if (*tty == '\0') 224 return PAM_SERVICE_ERR; 225 226 if (openpam_get_option(pamh, "no_nested") == NULL || nuser == NULL) { 227 228 #ifdef SUPPORT_UTMPX 229 if (logoutx(tty, 0, DEAD_PROCESS)) 230 logwtmpx(tty, "", "", 0, DEAD_PROCESS); 231 else 232 logit(LOG_NOTICE, "%s(): no utmpx record for %s", 233 __func__, tty); 234 #endif 235 236 #ifdef SUPPORT_UTMP 237 if (logout(tty)) 238 logwtmp(tty, "", ""); 239 else 240 logit(LOG_NOTICE, "%s(): no utmp record for %s", 241 __func__, tty); 242 #endif 243 } 244 return PAM_SUCCESS; 245 } 246 247 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 248 static void 249 domsg(pam_handle_t *pamh, time_t t, const char *host, size_t hsize, 250 const char *line, size_t lsize) 251 { 252 char buf[MAXHOSTNAMELEN + 32], *promptresp = NULL; 253 int pam_err; 254 255 if (*host) { 256 (void)snprintf(buf, sizeof(buf), "from %.*s ", 257 (int)hsize, host); 258 host = buf; 259 } 260 261 pam_err = pam_prompt(pamh, PAM_TEXT_INFO, &promptresp, 262 "Last login: %.24s %son %.*s\n", ctime(&t), host, (int)lsize, line); 263 264 if (pam_err == PAM_SUCCESS && promptresp) 265 free(promptresp); 266 } 267 #endif 268 269 #ifdef SUPPORT_UTMPX 270 static void 271 doutmpx(const char *username, const char *hostname, const char *tty, 272 const struct sockaddr_storage *ss, const struct timeval *now) 273 { 274 struct utmpx utmpx; 275 const char *t; 276 277 memset((void *)&utmpx, 0, sizeof(utmpx)); 278 utmpx.ut_tv = *now; 279 (void)strncpy(utmpx.ut_name, username, sizeof(utmpx.ut_name)); 280 if (hostname) { 281 (void)strncpy(utmpx.ut_host, hostname, sizeof(utmpx.ut_host)); 282 if (ss) 283 utmpx.ut_ss = *ss; 284 } 285 (void)strncpy(utmpx.ut_line, tty, sizeof(utmpx.ut_line)); 286 utmpx.ut_type = USER_PROCESS; 287 utmpx.ut_pid = getpid(); 288 t = tty + strlen(tty); 289 if ((size_t)(t - tty) >= sizeof(utmpx.ut_id)) { 290 (void)strncpy(utmpx.ut_id, t - sizeof(utmpx.ut_id), 291 sizeof(utmpx.ut_id)); 292 } else { 293 (void)strncpy(utmpx.ut_id, tty, sizeof(utmpx.ut_id)); 294 } 295 if (pututxline(&utmpx) == NULL) 296 logit(LOG_NOTICE, "Cannot update utmpx: %s", strerror(errno)); 297 endutxent(); 298 if (updwtmpx(_PATH_WTMPX, &utmpx) != 0) 299 logit(LOG_NOTICE, "Cannot update wtmpx: %s", strerror(errno)); 300 } 301 302 static void 303 dolastlogx(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 304 const char *hostname, const char *tty, const struct sockaddr_storage *ss, 305 const struct timeval *now) 306 { 307 struct lastlogx ll; 308 if (!quiet) { 309 if (getlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != NULL) 310 domsg(pamh, (time_t)ll.ll_tv.tv_sec, ll.ll_host, 311 sizeof(ll.ll_host), ll.ll_line, 312 sizeof(ll.ll_line)); 313 } 314 ll.ll_tv = *now; 315 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 316 317 if (hostname) 318 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 319 else 320 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 321 322 if (ss) 323 ll.ll_ss = *ss; 324 else 325 (void)memset(&ll.ll_ss, 0, sizeof(ll.ll_ss)); 326 327 if (updlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != 0) 328 logit(LOG_NOTICE, "Cannot update lastlogx: %s", strerror(errno)); 329 PAM_LOG("Login recorded in %s", _PATH_LASTLOGX); 330 } 331 #endif 332 333 #ifdef SUPPORT_UTMP 334 static void 335 doutmp(const char *username, const char *hostname, const char *tty, 336 const struct timeval *now) 337 { 338 struct utmp utmp; 339 340 (void)memset((void *)&utmp, 0, sizeof(utmp)); 341 utmp.ut_time = now->tv_sec; 342 (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); 343 if (hostname) 344 (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); 345 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 346 login(&utmp); 347 } 348 349 static void 350 dolastlog(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 351 const char *hostname, const char *tty, const struct timeval *now) 352 { 353 struct lastlog ll; 354 int fd; 355 356 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) == -1) { 357 logit(LOG_NOTICE, "Cannot open `%s': %s", _PATH_LASTLOG, 358 strerror(errno)); 359 return; 360 } 361 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 362 363 if (!quiet) { 364 if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && 365 ll.ll_time != 0) 366 domsg(pamh, ll.ll_time, ll.ll_host, 367 sizeof(ll.ll_host), ll.ll_line, 368 sizeof(ll.ll_line)); 369 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 370 } 371 372 ll.ll_time = now->tv_sec; 373 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 374 375 if (hostname) 376 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 377 else 378 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 379 380 (void)write(fd, &ll, sizeof(ll)); 381 (void)close(fd); 382 383 PAM_LOG("Login recorded in %s", _PATH_LASTLOG); 384 } 385 #endif 386 387 PAM_MODULE_ENTRY("pam_lastlog"); 388
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