pam_lastlog.c revision 1.11
1 /* $NetBSD: pam_lastlog.c,v 1.11 2006/11/03 18:04:20 christos 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 1.11 2006/11/03 18:04:20 christos 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 #include <stdarg.h> 66 #ifdef LOGIN_CAP 67 #include <login_cap.h> 68 #endif 69 70 #define PAM_SM_SESSION 71 72 #include <security/pam_appl.h> 73 #include <security/pam_modules.h> 74 #include <security/pam_mod_misc.h> 75 76 #ifdef SUPPORT_UTMP 77 #include <utmp.h> 78 static void doutmp(const char *, const char *, const char *, 79 const struct timeval *); 80 static void dolastlog(pam_handle_t *, int, const struct passwd *, const char *, 81 const char *, const struct timeval *); 82 #endif 83 84 #ifdef SUPPORT_UTMPX 85 #include <utmpx.h> 86 static void doutmpx(const char *, const char *, const char *, 87 const struct sockaddr_storage *ss, const struct timeval *); 88 static void dolastlogx(pam_handle_t *, int, const struct passwd *, const char *, 89 const char *, const struct sockaddr_storage *ss, const struct timeval *); 90 #endif 91 92 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 93 static void domsg(pam_handle_t *, time_t, const char *, size_t, const char *, 94 size_t); 95 #endif 96 97 static void 98 logit(int level, const char *fmt, ...) 99 { 100 va_list ap; 101 struct syslog_data data; 102 103 openlog_r("pam_lastlog", LOG_PID, LOG_AUTHPRIV, &data); 104 va_start(ap, fmt); 105 vsyslog_r(level, &data, fmt, ap); 106 va_end(ap); 107 closelog_r(&data); 108 } 109 110 111 PAM_EXTERN int 112 pam_sm_open_session(pam_handle_t *pamh, int flags, 113 int argc __unused, const char *argv[] __unused) 114 { 115 struct passwd *pwd, pwres; 116 struct timeval now; 117 const char *user, *rhost, *tty, *nuser; 118 const void *vrhost, *vtty, *vss, *vnuser; 119 const struct sockaddr_storage *ss; 120 int pam_err; 121 char pwbuf[1024]; 122 #ifdef LOGIN_CAP 123 login_cap_t *lc; 124 #endif 125 126 pam_err = pam_get_user(pamh, &user, NULL); 127 if (pam_err != PAM_SUCCESS) 128 return pam_err; 129 130 if (user == NULL || 131 getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 || 132 pwd == NULL) 133 return PAM_SERVICE_ERR; 134 135 PAM_LOG("Got user: %s", user); 136 137 pam_err = pam_get_item(pamh, PAM_RHOST, &vrhost); 138 if (pam_err != PAM_SUCCESS) 139 goto err; 140 rhost = (const char *)vrhost; 141 142 pam_err = pam_get_item(pamh, PAM_SOCKADDR, &vss); 143 if (pam_err != PAM_SUCCESS) 144 goto err; 145 ss = (const struct sockaddr_storage *)vss; 146 147 pam_err = pam_get_item(pamh, PAM_TTY, &vtty); 148 if (pam_err != PAM_SUCCESS) 149 goto err; 150 tty = (const char *)vtty; 151 152 if (tty == NULL) { 153 pam_err = PAM_SERVICE_ERR; 154 goto err; 155 } 156 157 if (pam_get_item(pamh, PAM_NUSER, &vnuser) != PAM_SUCCESS) 158 nuser = NULL; 159 else 160 nuser = (const char *)vnuser; 161 162 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 163 tty = tty + strlen(_PATH_DEV); 164 165 if (*tty == '\0') { 166 pam_err = PAM_SERVICE_ERR; 167 goto err; 168 } 169 170 (void)gettimeofday(&now, NULL); 171 172 if (openpam_get_option(pamh, "no_nested") == NULL || nuser == NULL) { 173 int quiet; 174 if ((flags & PAM_SILENT) != 0) 175 quiet = 1; 176 else { 177 #ifdef LOGIN_CAP 178 lc = login_getpwclass(pwd); 179 quiet = login_getcapbool(lc, "hushlogin", 0); 180 login_close(lc); 181 #else 182 quiet = 0; 183 #endif 184 } 185 #ifdef SUPPORT_UTMPX 186 doutmpx(user, rhost, tty, ss, &now); 187 dolastlogx(pamh, quiet, pwd, rhost, tty, ss, &now); 188 quiet = 1; 189 #endif 190 #ifdef SUPPORT_UTMP 191 doutmp(user, rhost, tty, &now); 192 dolastlog(pamh, quiet, pwd, rhost, tty, &now); 193 #endif 194 } 195 err: 196 if (openpam_get_option(pamh, "no_fail")) 197 return PAM_SUCCESS; 198 return pam_err; 199 } 200 201 PAM_EXTERN int 202 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, 203 int argc __unused, const char *argv[] __unused) 204 { 205 const void *vtty, *vnuser; 206 const char *tty, *nuser; 207 208 if (pam_get_item(pamh, PAM_NUSER, &vnuser) != PAM_SUCCESS) 209 nuser = NULL; 210 else 211 nuser = (const char *)vnuser; 212 213 pam_get_item(pamh, PAM_TTY, &vtty); 214 if (vtty == NULL) 215 return PAM_SERVICE_ERR; 216 tty = (const char *)vtty; 217 218 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 219 tty = tty + strlen(_PATH_DEV); 220 221 if (*tty == '\0') 222 return PAM_SERVICE_ERR; 223 224 if (openpam_get_option(pamh, "no_nested") == NULL || nuser == NULL) { 225 226 #ifdef SUPPORT_UTMPX 227 if (logoutx(tty, 0, DEAD_PROCESS)) 228 logwtmpx(tty, "", "", 0, DEAD_PROCESS); 229 else 230 logit(LOG_NOTICE, "%s(): no utmpx record for %s", 231 __func__, tty); 232 #endif 233 234 #ifdef SUPPORT_UTMP 235 if (logout(tty)) 236 logwtmp(tty, "", ""); 237 else 238 logit(LOG_NOTICE, "%s(): no utmp record for %s", 239 __func__, tty); 240 #endif 241 } 242 return PAM_SUCCESS; 243 } 244 245 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 246 static void 247 domsg(pam_handle_t *pamh, time_t t, const char *host, size_t hsize, 248 const char *line, size_t lsize) 249 { 250 char buf[MAXHOSTNAMELEN + 32], *promptresp = NULL; 251 int pam_err; 252 253 if (*host) { 254 (void)snprintf(buf, sizeof(buf), "from %.*s ", 255 (int)hsize, host); 256 host = buf; 257 } 258 259 pam_err = pam_prompt(pamh, PAM_TEXT_INFO, &promptresp, 260 "Last login: %.24s %son %.*s\n", ctime(&t), host, (int)lsize, line); 261 262 if (pam_err == PAM_SUCCESS && promptresp) 263 free(promptresp); 264 } 265 #endif 266 267 #ifdef SUPPORT_UTMPX 268 static void 269 doutmpx(const char *username, const char *hostname, const char *tty, 270 const struct sockaddr_storage *ss, const struct timeval *now) 271 { 272 struct utmpx utmpx; 273 const char *t; 274 275 memset((void *)&utmpx, 0, sizeof(utmpx)); 276 utmpx.ut_tv = *now; 277 (void)strncpy(utmpx.ut_name, username, sizeof(utmpx.ut_name)); 278 if (hostname) { 279 (void)strncpy(utmpx.ut_host, hostname, sizeof(utmpx.ut_host)); 280 if (ss) 281 utmpx.ut_ss = *ss; 282 } 283 (void)strncpy(utmpx.ut_line, tty, sizeof(utmpx.ut_line)); 284 utmpx.ut_type = USER_PROCESS; 285 utmpx.ut_pid = getpid(); 286 t = tty + strlen(tty); 287 if (t - tty >= sizeof(utmpx.ut_id)) { 288 (void)strncpy(utmpx.ut_id, t - sizeof(utmpx.ut_id), 289 sizeof(utmpx.ut_id)); 290 } else { 291 (void)strncpy(utmpx.ut_id, tty, sizeof(utmpx.ut_id)); 292 } 293 if (pututxline(&utmpx) == NULL) 294 logit(LOG_NOTICE, "Cannot update utmpx %m"); 295 endutxent(); 296 if (updwtmpx(_PATH_WTMPX, &utmpx) != 0) 297 logit(LOG_NOTICE, "Cannot update wtmpx %m"); 298 } 299 300 static void 301 dolastlogx(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 302 const char *hostname, const char *tty, const struct sockaddr_storage *ss, 303 const struct timeval *now) 304 { 305 struct lastlogx ll; 306 if (!quiet) { 307 if (getlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != NULL) 308 domsg(pamh, (time_t)ll.ll_tv.tv_sec, ll.ll_host, 309 sizeof(ll.ll_host), ll.ll_line, 310 sizeof(ll.ll_line)); 311 } 312 ll.ll_tv = *now; 313 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 314 315 if (hostname) 316 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 317 else 318 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 319 320 if (ss) 321 ll.ll_ss = *ss; 322 else 323 (void)memset(&ll.ll_ss, 0, sizeof(ll.ll_ss)); 324 325 if (updlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != 0) 326 logit(LOG_NOTICE, "Cannot update lastlogx %m"); 327 PAM_LOG("Login recorded in %s", _PATH_LASTLOGX); 328 } 329 #endif 330 331 #ifdef SUPPORT_UTMP 332 static void 333 doutmp(const char *username, const char *hostname, const char *tty, 334 const struct timeval *now) 335 { 336 struct utmp utmp; 337 338 (void)memset((void *)&utmp, 0, sizeof(utmp)); 339 utmp.ut_time = now->tv_sec; 340 (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); 341 if (hostname) 342 (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); 343 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 344 login(&utmp); 345 } 346 347 static void 348 dolastlog(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 349 const char *hostname, const char *tty, const struct timeval *now) 350 { 351 struct lastlog ll; 352 int fd; 353 354 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) == -1) { 355 logit(LOG_NOTICE, "Cannot open `%s' %m", _PATH_LASTLOG); 356 return; 357 } 358 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 359 360 if (!quiet) { 361 if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && 362 ll.ll_time != 0) 363 domsg(pamh, ll.ll_time, ll.ll_host, 364 sizeof(ll.ll_host), ll.ll_line, 365 sizeof(ll.ll_line)); 366 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 367 } 368 369 ll.ll_time = now->tv_sec; 370 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 371 372 if (hostname) 373 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 374 else 375 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 376 377 (void)write(fd, &ll, sizeof(ll)); 378 (void)close(fd); 379 380 PAM_LOG("Login recorded in %s", _PATH_LASTLOG); 381 } 382 #endif 383 384 PAM_MODULE_ENTRY("pam_lastlog"); 385
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