pam_lastlog.c revision 1.14
1 /* $NetBSD: pam_lastlog.c,v 1.14 2012/01/03 19:02:55 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 1.14 2012/01/03 19:02:55 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 <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 static void 99 logit(int level, const char *fmt, ...) 100 { 101 va_list ap; 102 struct syslog_data data = SYSLOG_DATA_INIT; 103 104 openlog_r("pam_lastlog", LOG_PID, LOG_AUTHPRIV, &data); 105 va_start(ap, fmt); 106 vsyslog_r(level, &data, fmt, ap); 107 va_end(ap); 108 closelog_r(&data); 109 } 110 111 112 PAM_EXTERN int 113 pam_sm_open_session(pam_handle_t *pamh, int flags, 114 int argc __unused, const char *argv[] __unused) 115 { 116 struct passwd *pwd, pwres; 117 struct timeval now; 118 const char *user, *rhost, *tty, *nuser; 119 const void *vrhost, *vtty, *vss, *vnuser; 120 const struct sockaddr_storage *ss; 121 int pam_err; 122 char pwbuf[1024]; 123 #ifdef LOGIN_CAP 124 login_cap_t *lc; 125 #endif 126 127 pam_err = pam_get_user(pamh, &user, NULL); 128 if (pam_err != PAM_SUCCESS) 129 return pam_err; 130 131 if (user == NULL || 132 getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 || 133 pwd == NULL) 134 return PAM_SERVICE_ERR; 135 136 PAM_LOG("Got user: %s", user); 137 138 pam_err = pam_get_item(pamh, PAM_RHOST, &vrhost); 139 if (pam_err != PAM_SUCCESS) 140 goto err; 141 rhost = (const char *)vrhost; 142 143 pam_err = pam_get_item(pamh, PAM_SOCKADDR, &vss); 144 if (pam_err != PAM_SUCCESS) 145 goto err; 146 ss = (const struct sockaddr_storage *)vss; 147 148 pam_err = pam_get_item(pamh, PAM_TTY, &vtty); 149 if (pam_err != PAM_SUCCESS) 150 goto err; 151 tty = (const char *)vtty; 152 153 if (tty == NULL) { 154 pam_err = PAM_SERVICE_ERR; 155 goto err; 156 } 157 158 if (pam_get_item(pamh, PAM_NUSER, &vnuser) != PAM_SUCCESS) 159 nuser = NULL; 160 else 161 nuser = (const char *)vnuser; 162 163 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 164 tty = tty + strlen(_PATH_DEV); 165 166 if (*tty == '\0') { 167 pam_err = PAM_SERVICE_ERR; 168 goto err; 169 } 170 171 (void)gettimeofday(&now, NULL); 172 173 if (openpam_get_option(pamh, "no_nested") == NULL || nuser == NULL) { 174 int quiet; 175 if ((flags & PAM_SILENT) != 0) 176 quiet = 1; 177 else { 178 #ifdef LOGIN_CAP 179 lc = login_getpwclass(pwd); 180 quiet = login_getcapbool(lc, "hushlogin", 0); 181 login_close(lc); 182 #else 183 quiet = 0; 184 #endif 185 } 186 #ifdef SUPPORT_UTMPX 187 doutmpx(user, rhost, tty, ss, &now); 188 dolastlogx(pamh, quiet, pwd, rhost, tty, ss, &now); 189 quiet = 1; 190 #endif 191 #ifdef SUPPORT_UTMP 192 doutmp(user, rhost, tty, &now); 193 dolastlog(pamh, quiet, pwd, rhost, tty, &now); 194 #endif 195 } 196 err: 197 if (openpam_get_option(pamh, "no_fail")) 198 return PAM_SUCCESS; 199 return pam_err; 200 } 201 202 PAM_EXTERN int 203 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, 204 int argc __unused, const char *argv[] __unused) 205 { 206 const void *vtty, *vnuser; 207 const char *tty, *nuser; 208 209 if (pam_get_item(pamh, PAM_NUSER, &vnuser) != PAM_SUCCESS) 210 nuser = NULL; 211 else 212 nuser = (const char *)vnuser; 213 214 pam_get_item(pamh, PAM_TTY, &vtty); 215 if (vtty == NULL) 216 return PAM_SERVICE_ERR; 217 tty = (const char *)vtty; 218 219 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 220 tty = tty + strlen(_PATH_DEV); 221 222 if (*tty == '\0') 223 return PAM_SERVICE_ERR; 224 225 if (openpam_get_option(pamh, "no_nested") == NULL || nuser == NULL) { 226 227 #ifdef SUPPORT_UTMPX 228 if (logoutx(tty, 0, DEAD_PROCESS)) 229 logwtmpx(tty, "", "", 0, DEAD_PROCESS); 230 else 231 logit(LOG_NOTICE, "%s(): no utmpx record for %s", 232 __func__, tty); 233 #endif 234 235 #ifdef SUPPORT_UTMP 236 if (logout(tty)) 237 logwtmp(tty, "", ""); 238 else 239 logit(LOG_NOTICE, "%s(): no utmp record for %s", 240 __func__, tty); 241 #endif 242 } 243 return PAM_SUCCESS; 244 } 245 246 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 247 static void 248 domsg(pam_handle_t *pamh, time_t t, const char *host, size_t hsize, 249 const char *line, size_t lsize) 250 { 251 char buf[MAXHOSTNAMELEN + 32], *promptresp = NULL; 252 int pam_err; 253 254 if (*host) { 255 (void)snprintf(buf, sizeof(buf), "from %.*s ", 256 (int)hsize, host); 257 host = buf; 258 } 259 260 pam_err = pam_prompt(pamh, PAM_TEXT_INFO, &promptresp, 261 "Last login: %.24s %son %.*s\n", ctime(&t), host, (int)lsize, line); 262 263 if (pam_err == PAM_SUCCESS && promptresp) 264 free(promptresp); 265 } 266 #endif 267 268 #ifdef SUPPORT_UTMPX 269 static void 270 doutmpx(const char *username, const char *hostname, const char *tty, 271 const struct sockaddr_storage *ss, const struct timeval *now) 272 { 273 struct utmpx utmpx; 274 const char *t; 275 276 memset((void *)&utmpx, 0, sizeof(utmpx)); 277 utmpx.ut_tv = *now; 278 (void)strncpy(utmpx.ut_name, username, sizeof(utmpx.ut_name)); 279 if (hostname) { 280 (void)strncpy(utmpx.ut_host, hostname, sizeof(utmpx.ut_host)); 281 if (ss) 282 utmpx.ut_ss = *ss; 283 } 284 (void)strncpy(utmpx.ut_line, tty, sizeof(utmpx.ut_line)); 285 utmpx.ut_type = USER_PROCESS; 286 utmpx.ut_pid = getpid(); 287 t = tty + strlen(tty); 288 if ((size_t)(t - tty) >= sizeof(utmpx.ut_id)) { 289 (void)strncpy(utmpx.ut_id, t - sizeof(utmpx.ut_id), 290 sizeof(utmpx.ut_id)); 291 } else { 292 (void)strncpy(utmpx.ut_id, tty, sizeof(utmpx.ut_id)); 293 } 294 if (pututxline(&utmpx) == NULL) 295 logit(LOG_NOTICE, "Cannot update utmpx: %s", strerror(errno)); 296 endutxent(); 297 if (updwtmpx(_PATH_WTMPX, &utmpx) != 0) 298 logit(LOG_NOTICE, "Cannot update wtmpx: %s", strerror(errno)); 299 } 300 301 static void 302 dolastlogx(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 303 const char *hostname, const char *tty, const struct sockaddr_storage *ss, 304 const struct timeval *now) 305 { 306 struct lastlogx ll; 307 if (!quiet) { 308 if (getlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != NULL) 309 domsg(pamh, (time_t)ll.ll_tv.tv_sec, ll.ll_host, 310 sizeof(ll.ll_host), ll.ll_line, 311 sizeof(ll.ll_line)); 312 } 313 ll.ll_tv = *now; 314 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 315 316 if (hostname) 317 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 318 else 319 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 320 321 if (ss) 322 ll.ll_ss = *ss; 323 else 324 (void)memset(&ll.ll_ss, 0, sizeof(ll.ll_ss)); 325 326 if (updlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != 0) 327 logit(LOG_NOTICE, "Cannot update lastlogx: %s", strerror(errno)); 328 PAM_LOG("Login recorded in %s", _PATH_LASTLOGX); 329 } 330 #endif 331 332 #ifdef SUPPORT_UTMP 333 static void 334 doutmp(const char *username, const char *hostname, const char *tty, 335 const struct timeval *now) 336 { 337 struct utmp utmp; 338 339 (void)memset((void *)&utmp, 0, sizeof(utmp)); 340 utmp.ut_time = now->tv_sec; 341 (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); 342 if (hostname) 343 (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); 344 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 345 login(&utmp); 346 } 347 348 static void 349 dolastlog(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 350 const char *hostname, const char *tty, const struct timeval *now) 351 { 352 struct lastlog ll; 353 int fd; 354 355 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) == -1) { 356 logit(LOG_NOTICE, "Cannot open `%s': %s", _PATH_LASTLOG, 357 strerror(errno)); 358 return; 359 } 360 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 361 362 if (!quiet) { 363 if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && 364 ll.ll_time != 0) 365 domsg(pamh, ll.ll_time, ll.ll_host, 366 sizeof(ll.ll_host), ll.ll_line, 367 sizeof(ll.ll_line)); 368 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 369 } 370 371 ll.ll_time = now->tv_sec; 372 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 373 374 if (hostname) 375 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 376 else 377 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 378 379 (void)write(fd, &ll, sizeof(ll)); 380 (void)close(fd); 381 382 PAM_LOG("Login recorded in %s", _PATH_LASTLOG); 383 } 384 #endif 385 386 PAM_MODULE_ENTRY("pam_lastlog"); 387
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