1 /* $NetBSD: pam_lastlog.c,v 1.8 2005/04/19 03:15:35 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 1.8 2005/04/19 03:15:35 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 #ifdef LOGIN_CAP 66 #include <login_cap.h> 67 #endif 68 69 #define PAM_SM_SESSION 70 71 #include <security/pam_appl.h> 72 #include <security/pam_modules.h> 73 #include <security/pam_mod_misc.h> 74 75 #ifdef SUPPORT_UTMP 76 #include <utmp.h> 77 static void doutmp(const char *, const char *, const char *, 78 const struct timeval *); 79 static void dolastlog(pam_handle_t *, int, const struct passwd *, const char *, 80 const char *, const struct timeval *); 81 #endif 82 83 #ifdef SUPPORT_UTMPX 84 #include <utmpx.h> 85 static void doutmpx(const char *, const char *, const char *, 86 const struct sockaddr_storage *ss, const struct timeval *); 87 static void dolastlogx(pam_handle_t *, int, const struct passwd *, const char *, 88 const char *, const struct sockaddr_storage *ss, const struct timeval *); 89 #endif 90 91 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 92 static void domsg(pam_handle_t *, time_t, const char *, size_t, const char *, 93 size_t); 94 #endif 95 96 PAM_EXTERN int 97 pam_sm_open_session(pam_handle_t *pamh, int flags, 98 int argc __unused, const char *argv[] __unused) 99 { 100 struct passwd *pwd, pwres; 101 struct timeval now; 102 const char *user, *rhost, *tty, *nuser; 103 const void *vrhost, *vtty, *vss, *vnuser; 104 const struct sockaddr_storage *ss; 105 int pam_err; 106 char pwbuf[1024]; 107 108 pam_err = pam_get_user(pamh, &user, NULL); 109 if (pam_err != PAM_SUCCESS) 110 return pam_err; 111 112 if (user == NULL || 113 getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 || 114 pwd == NULL) 115 return PAM_SERVICE_ERR; 116 117 PAM_LOG("Got user: %s", user); 118 119 pam_err = pam_get_item(pamh, PAM_RHOST, &vrhost); 120 if (pam_err != PAM_SUCCESS) 121 goto err; 122 rhost = (const char *)vrhost; 123 124 pam_err = pam_get_item(pamh, PAM_SOCKADDR, &vss); 125 if (pam_err != PAM_SUCCESS) 126 goto err; 127 ss = (const struct sockaddr_storage *)vss; 128 129 pam_err = pam_get_item(pamh, PAM_TTY, &vtty); 130 if (pam_err != PAM_SUCCESS) 131 goto err; 132 tty = (const char *)vtty; 133 134 if (tty == NULL) { 135 pam_err = PAM_SERVICE_ERR; 136 goto err; 137 } 138 139 if (pam_get_item(pamh, PAM_NUSER, &vnuser) != PAM_SUCCESS) 140 nuser = NULL; 141 else 142 nuser = (const char *)vnuser; 143 144 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 145 tty = tty + strlen(_PATH_DEV); 146 147 if (*tty == '\0') { 148 pam_err = PAM_SERVICE_ERR; 149 goto err; 150 } 151 152 (void)gettimeofday(&now, NULL); 153 154 if (openpam_get_option(pamh, "no_nested") == NULL || nuser == NULL) { 155 int quiet; 156 #ifdef LOGIN_CAP 157 quiet = login_getcapbool(login_getpwclass(pwd), "hushlogin", 0); 158 #else 159 quiet = 0; 160 #endif 161 #ifdef SUPPORT_UTMPX 162 doutmpx(user, rhost, tty, ss, &now); 163 dolastlogx(pamh, quiet, pwd, rhost, tty, ss, &now); 164 quiet = 1; 165 #endif 166 #ifdef SUPPORT_UTMP 167 doutmp(user, rhost, tty, &now); 168 dolastlog(pamh, quiet, pwd, rhost, tty, &now); 169 #endif 170 } 171 err: 172 if (openpam_get_option(pamh, "no_fail")) 173 return PAM_SUCCESS; 174 return pam_err; 175 } 176 177 PAM_EXTERN int 178 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, 179 int argc __unused, const char *argv[] __unused) 180 { 181 const void *vtty, *vnuser; 182 const char *tty, *nuser; 183 184 if (pam_get_item(pamh, PAM_NUSER, &vnuser) != PAM_SUCCESS) 185 nuser = NULL; 186 else 187 nuser = (const char *)vnuser; 188 189 pam_get_item(pamh, PAM_TTY, &vtty); 190 if (vtty == NULL) 191 return PAM_SERVICE_ERR; 192 tty = (const char *)vtty; 193 194 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 195 tty = tty + strlen(_PATH_DEV); 196 197 if (*tty == '\0') 198 return PAM_SERVICE_ERR; 199 200 if (openpam_get_option(pamh, "no_nested") == NULL || nuser == NULL) { 201 202 #ifdef SUPPORT_UTMPX 203 if (logoutx(tty, 0, DEAD_PROCESS)) 204 logwtmpx(tty, "", "", 0, DEAD_PROCESS); 205 else 206 syslog(LOG_NOTICE, "%s(): no utmpx record for %s", 207 __func__, tty); 208 #endif 209 210 #ifdef SUPPORT_UTMP 211 if (logout(tty)) 212 logwtmp(tty, "", ""); 213 else 214 syslog(LOG_NOTICE, "%s(): no utmp record for %s", 215 __func__, tty); 216 #endif 217 } 218 return PAM_SUCCESS; 219 } 220 221 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 222 static void 223 domsg(pam_handle_t *pamh, time_t t, const char *host, size_t hsize, 224 const char *line, size_t lsize) 225 { 226 char buf[MAXHOSTNAMELEN + 32], *promptresp = NULL; 227 int pam_err; 228 229 if (*host) { 230 (void)snprintf(buf, sizeof(buf), "from %.*s ", 231 (int)hsize, host); 232 host = buf; 233 } 234 235 pam_err = pam_prompt(pamh, PAM_TEXT_INFO, &promptresp, 236 "Last login: %.24s %son %.*s\n", ctime(&t), host, (int)lsize, line); 237 238 if (pam_err == PAM_SUCCESS && promptresp) 239 free(promptresp); 240 } 241 #endif 242 243 #ifdef SUPPORT_UTMPX 244 static void 245 doutmpx(const char *username, const char *hostname, const char *tty, 246 const struct sockaddr_storage *ss, const struct timeval *now) 247 { 248 struct utmpx utmpx; 249 const char *t; 250 251 memset((void *)&utmpx, 0, sizeof(utmpx)); 252 utmpx.ut_tv = *now; 253 (void)strncpy(utmpx.ut_name, username, sizeof(utmpx.ut_name)); 254 if (hostname) { 255 (void)strncpy(utmpx.ut_host, hostname, sizeof(utmpx.ut_host)); 256 if (ss) 257 utmpx.ut_ss = *ss; 258 } 259 (void)strncpy(utmpx.ut_line, tty, sizeof(utmpx.ut_line)); 260 utmpx.ut_type = USER_PROCESS; 261 utmpx.ut_pid = getpid(); 262 t = tty + strlen(tty); 263 if (t - tty >= sizeof(utmpx.ut_id)) { 264 (void)strncpy(utmpx.ut_id, t - sizeof(utmpx.ut_id), 265 sizeof(utmpx.ut_id)); 266 } else { 267 (void)strncpy(utmpx.ut_id, tty, sizeof(utmpx.ut_id)); 268 } 269 if (pututxline(&utmpx) == NULL) 270 syslog(LOG_NOTICE, "Cannot update utmpx %m"); 271 endutxent(); 272 if (updwtmpx(_PATH_WTMPX, &utmpx) != 0) 273 syslog(LOG_NOTICE, "Cannot update wtmpx %m"); 274 } 275 276 static void 277 dolastlogx(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 278 const char *hostname, const char *tty, const struct sockaddr_storage *ss, 279 const struct timeval *now) 280 { 281 struct lastlogx ll; 282 if (!quiet) { 283 if (getlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != NULL) 284 domsg(pamh, (time_t)ll.ll_tv.tv_sec, ll.ll_host, 285 sizeof(ll.ll_host), ll.ll_line, 286 sizeof(ll.ll_line)); 287 } 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 syslog(LOG_NOTICE, "Cannot update lastlogx %m"); 303 PAM_LOG("Login recorded in %s", _PATH_LASTLOGX); 304 } 305 #endif 306 307 #ifdef SUPPORT_UTMP 308 static void 309 doutmp(const char *username, const char *hostname, const char *tty, 310 const struct timeval *now) 311 { 312 struct utmp utmp; 313 314 (void)memset((void *)&utmp, 0, sizeof(utmp)); 315 utmp.ut_time = now->tv_sec; 316 (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); 317 if (hostname) 318 (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); 319 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 320 login(&utmp); 321 } 322 323 static void 324 dolastlog(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 325 const char *hostname, const char *tty, const struct timeval *now) 326 { 327 struct lastlog ll; 328 int fd; 329 330 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) == -1) { 331 syslog(LOG_NOTICE, "Cannot open `%s' %m", _PATH_LASTLOG); 332 return; 333 } 334 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 335 336 if (!quiet) { 337 if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && 338 ll.ll_time != 0) 339 domsg(pamh, ll.ll_time, ll.ll_host, 340 sizeof(ll.ll_host), ll.ll_line, 341 sizeof(ll.ll_line)); 342 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 343 } 344 345 ll.ll_time = now->tv_sec; 346 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 347 348 if (hostname) 349 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 350 else 351 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 352 353 (void)write(fd, &ll, sizeof(ll)); 354 (void)close(fd); 355 356 PAM_LOG("Login recorded in %s", _PATH_LASTLOG); 357 } 358 #endif 359 360 PAM_MODULE_ENTRY("pam_lastlog"); 361