pam_lastlog.c revision 1.9
1 /* $NetBSD: pam_lastlog.c,v 1.9 2006/02/19 00:13:09 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 1.9 2006/02/19 00:13:09 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 if ((flags & PAM_SILENT) != 0) 157 quiet = 1; 158 else { 159 #ifdef LOGIN_CAP 160 quiet = login_getcapbool(login_getpwclass(pwd), 161 "hushlogin", 0); 162 #else 163 quiet = 0; 164 #endif 165 } 166 #ifdef SUPPORT_UTMPX 167 doutmpx(user, rhost, tty, ss, &now); 168 dolastlogx(pamh, quiet, pwd, rhost, tty, ss, &now); 169 quiet = 1; 170 #endif 171 #ifdef SUPPORT_UTMP 172 doutmp(user, rhost, tty, &now); 173 dolastlog(pamh, quiet, pwd, rhost, tty, &now); 174 #endif 175 } 176 err: 177 if (openpam_get_option(pamh, "no_fail")) 178 return PAM_SUCCESS; 179 return pam_err; 180 } 181 182 PAM_EXTERN int 183 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, 184 int argc __unused, const char *argv[] __unused) 185 { 186 const void *vtty, *vnuser; 187 const char *tty, *nuser; 188 189 if (pam_get_item(pamh, PAM_NUSER, &vnuser) != PAM_SUCCESS) 190 nuser = NULL; 191 else 192 nuser = (const char *)vnuser; 193 194 pam_get_item(pamh, PAM_TTY, &vtty); 195 if (vtty == NULL) 196 return PAM_SERVICE_ERR; 197 tty = (const char *)vtty; 198 199 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 200 tty = tty + strlen(_PATH_DEV); 201 202 if (*tty == '\0') 203 return PAM_SERVICE_ERR; 204 205 if (openpam_get_option(pamh, "no_nested") == NULL || nuser == NULL) { 206 207 #ifdef SUPPORT_UTMPX 208 if (logoutx(tty, 0, DEAD_PROCESS)) 209 logwtmpx(tty, "", "", 0, DEAD_PROCESS); 210 else 211 syslog(LOG_NOTICE, "%s(): no utmpx record for %s", 212 __func__, tty); 213 #endif 214 215 #ifdef SUPPORT_UTMP 216 if (logout(tty)) 217 logwtmp(tty, "", ""); 218 else 219 syslog(LOG_NOTICE, "%s(): no utmp record for %s", 220 __func__, tty); 221 #endif 222 } 223 return PAM_SUCCESS; 224 } 225 226 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 227 static void 228 domsg(pam_handle_t *pamh, time_t t, const char *host, size_t hsize, 229 const char *line, size_t lsize) 230 { 231 char buf[MAXHOSTNAMELEN + 32], *promptresp = NULL; 232 int pam_err; 233 234 if (*host) { 235 (void)snprintf(buf, sizeof(buf), "from %.*s ", 236 (int)hsize, host); 237 host = buf; 238 } 239 240 pam_err = pam_prompt(pamh, PAM_TEXT_INFO, &promptresp, 241 "Last login: %.24s %son %.*s\n", ctime(&t), host, (int)lsize, line); 242 243 if (pam_err == PAM_SUCCESS && promptresp) 244 free(promptresp); 245 } 246 #endif 247 248 #ifdef SUPPORT_UTMPX 249 static void 250 doutmpx(const char *username, const char *hostname, const char *tty, 251 const struct sockaddr_storage *ss, const struct timeval *now) 252 { 253 struct utmpx utmpx; 254 const char *t; 255 256 memset((void *)&utmpx, 0, sizeof(utmpx)); 257 utmpx.ut_tv = *now; 258 (void)strncpy(utmpx.ut_name, username, sizeof(utmpx.ut_name)); 259 if (hostname) { 260 (void)strncpy(utmpx.ut_host, hostname, sizeof(utmpx.ut_host)); 261 if (ss) 262 utmpx.ut_ss = *ss; 263 } 264 (void)strncpy(utmpx.ut_line, tty, sizeof(utmpx.ut_line)); 265 utmpx.ut_type = USER_PROCESS; 266 utmpx.ut_pid = getpid(); 267 t = tty + strlen(tty); 268 if (t - tty >= sizeof(utmpx.ut_id)) { 269 (void)strncpy(utmpx.ut_id, t - sizeof(utmpx.ut_id), 270 sizeof(utmpx.ut_id)); 271 } else { 272 (void)strncpy(utmpx.ut_id, tty, sizeof(utmpx.ut_id)); 273 } 274 if (pututxline(&utmpx) == NULL) 275 syslog(LOG_NOTICE, "Cannot update utmpx %m"); 276 endutxent(); 277 if (updwtmpx(_PATH_WTMPX, &utmpx) != 0) 278 syslog(LOG_NOTICE, "Cannot update wtmpx %m"); 279 } 280 281 static void 282 dolastlogx(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 283 const char *hostname, const char *tty, const struct sockaddr_storage *ss, 284 const struct timeval *now) 285 { 286 struct lastlogx ll; 287 if (!quiet) { 288 if (getlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != NULL) 289 domsg(pamh, (time_t)ll.ll_tv.tv_sec, ll.ll_host, 290 sizeof(ll.ll_host), ll.ll_line, 291 sizeof(ll.ll_line)); 292 } 293 ll.ll_tv = *now; 294 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 295 296 if (hostname) 297 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 298 else 299 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 300 301 if (ss) 302 ll.ll_ss = *ss; 303 else 304 (void)memset(&ll.ll_ss, 0, sizeof(ll.ll_ss)); 305 306 if (updlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != 0) 307 syslog(LOG_NOTICE, "Cannot update lastlogx %m"); 308 PAM_LOG("Login recorded in %s", _PATH_LASTLOGX); 309 } 310 #endif 311 312 #ifdef SUPPORT_UTMP 313 static void 314 doutmp(const char *username, const char *hostname, const char *tty, 315 const struct timeval *now) 316 { 317 struct utmp utmp; 318 319 (void)memset((void *)&utmp, 0, sizeof(utmp)); 320 utmp.ut_time = now->tv_sec; 321 (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); 322 if (hostname) 323 (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); 324 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 325 login(&utmp); 326 } 327 328 static void 329 dolastlog(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 330 const char *hostname, const char *tty, const struct timeval *now) 331 { 332 struct lastlog ll; 333 int fd; 334 335 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) == -1) { 336 syslog(LOG_NOTICE, "Cannot open `%s' %m", _PATH_LASTLOG); 337 return; 338 } 339 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 340 341 if (!quiet) { 342 if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && 343 ll.ll_time != 0) 344 domsg(pamh, ll.ll_time, ll.ll_host, 345 sizeof(ll.ll_host), ll.ll_line, 346 sizeof(ll.ll_line)); 347 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 348 } 349 350 ll.ll_time = now->tv_sec; 351 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 352 353 if (hostname) 354 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 355 else 356 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 357 358 (void)write(fd, &ll, sizeof(ll)); 359 (void)close(fd); 360 361 PAM_LOG("Login recorded in %s", _PATH_LASTLOG); 362 } 363 #endif 364 365 PAM_MODULE_ENTRY("pam_lastlog"); 366
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