pam_lastlog.c revision 1.10
1 /* $NetBSD: pam_lastlog.c,v 1.10 2006/03/18 10:53:17 jnemeth 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 1.10 2006/03/18 10:53:17 jnemeth 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 #ifdef LOGIN_CAP 108 login_cap_t *lc; 109 #endif 110 111 pam_err = pam_get_user(pamh, &user, NULL); 112 if (pam_err != PAM_SUCCESS) 113 return pam_err; 114 115 if (user == NULL || 116 getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 || 117 pwd == NULL) 118 return PAM_SERVICE_ERR; 119 120 PAM_LOG("Got user: %s", user); 121 122 pam_err = pam_get_item(pamh, PAM_RHOST, &vrhost); 123 if (pam_err != PAM_SUCCESS) 124 goto err; 125 rhost = (const char *)vrhost; 126 127 pam_err = pam_get_item(pamh, PAM_SOCKADDR, &vss); 128 if (pam_err != PAM_SUCCESS) 129 goto err; 130 ss = (const struct sockaddr_storage *)vss; 131 132 pam_err = pam_get_item(pamh, PAM_TTY, &vtty); 133 if (pam_err != PAM_SUCCESS) 134 goto err; 135 tty = (const char *)vtty; 136 137 if (tty == NULL) { 138 pam_err = PAM_SERVICE_ERR; 139 goto err; 140 } 141 142 if (pam_get_item(pamh, PAM_NUSER, &vnuser) != PAM_SUCCESS) 143 nuser = NULL; 144 else 145 nuser = (const char *)vnuser; 146 147 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 148 tty = tty + strlen(_PATH_DEV); 149 150 if (*tty == '\0') { 151 pam_err = PAM_SERVICE_ERR; 152 goto err; 153 } 154 155 (void)gettimeofday(&now, NULL); 156 157 if (openpam_get_option(pamh, "no_nested") == NULL || nuser == NULL) { 158 int quiet; 159 if ((flags & PAM_SILENT) != 0) 160 quiet = 1; 161 else { 162 #ifdef LOGIN_CAP 163 lc = login_getpwclass(pwd); 164 quiet = login_getcapbool(lc, "hushlogin", 0); 165 login_close(lc); 166 #else 167 quiet = 0; 168 #endif 169 } 170 #ifdef SUPPORT_UTMPX 171 doutmpx(user, rhost, tty, ss, &now); 172 dolastlogx(pamh, quiet, pwd, rhost, tty, ss, &now); 173 quiet = 1; 174 #endif 175 #ifdef SUPPORT_UTMP 176 doutmp(user, rhost, tty, &now); 177 dolastlog(pamh, quiet, pwd, rhost, tty, &now); 178 #endif 179 } 180 err: 181 if (openpam_get_option(pamh, "no_fail")) 182 return PAM_SUCCESS; 183 return pam_err; 184 } 185 186 PAM_EXTERN int 187 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, 188 int argc __unused, const char *argv[] __unused) 189 { 190 const void *vtty, *vnuser; 191 const char *tty, *nuser; 192 193 if (pam_get_item(pamh, PAM_NUSER, &vnuser) != PAM_SUCCESS) 194 nuser = NULL; 195 else 196 nuser = (const char *)vnuser; 197 198 pam_get_item(pamh, PAM_TTY, &vtty); 199 if (vtty == NULL) 200 return PAM_SERVICE_ERR; 201 tty = (const char *)vtty; 202 203 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 204 tty = tty + strlen(_PATH_DEV); 205 206 if (*tty == '\0') 207 return PAM_SERVICE_ERR; 208 209 if (openpam_get_option(pamh, "no_nested") == NULL || nuser == NULL) { 210 211 #ifdef SUPPORT_UTMPX 212 if (logoutx(tty, 0, DEAD_PROCESS)) 213 logwtmpx(tty, "", "", 0, DEAD_PROCESS); 214 else 215 syslog(LOG_NOTICE, "%s(): no utmpx record for %s", 216 __func__, tty); 217 #endif 218 219 #ifdef SUPPORT_UTMP 220 if (logout(tty)) 221 logwtmp(tty, "", ""); 222 else 223 syslog(LOG_NOTICE, "%s(): no utmp record for %s", 224 __func__, tty); 225 #endif 226 } 227 return PAM_SUCCESS; 228 } 229 230 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 231 static void 232 domsg(pam_handle_t *pamh, time_t t, const char *host, size_t hsize, 233 const char *line, size_t lsize) 234 { 235 char buf[MAXHOSTNAMELEN + 32], *promptresp = NULL; 236 int pam_err; 237 238 if (*host) { 239 (void)snprintf(buf, sizeof(buf), "from %.*s ", 240 (int)hsize, host); 241 host = buf; 242 } 243 244 pam_err = pam_prompt(pamh, PAM_TEXT_INFO, &promptresp, 245 "Last login: %.24s %son %.*s\n", ctime(&t), host, (int)lsize, line); 246 247 if (pam_err == PAM_SUCCESS && promptresp) 248 free(promptresp); 249 } 250 #endif 251 252 #ifdef SUPPORT_UTMPX 253 static void 254 doutmpx(const char *username, const char *hostname, const char *tty, 255 const struct sockaddr_storage *ss, const struct timeval *now) 256 { 257 struct utmpx utmpx; 258 const char *t; 259 260 memset((void *)&utmpx, 0, sizeof(utmpx)); 261 utmpx.ut_tv = *now; 262 (void)strncpy(utmpx.ut_name, username, sizeof(utmpx.ut_name)); 263 if (hostname) { 264 (void)strncpy(utmpx.ut_host, hostname, sizeof(utmpx.ut_host)); 265 if (ss) 266 utmpx.ut_ss = *ss; 267 } 268 (void)strncpy(utmpx.ut_line, tty, sizeof(utmpx.ut_line)); 269 utmpx.ut_type = USER_PROCESS; 270 utmpx.ut_pid = getpid(); 271 t = tty + strlen(tty); 272 if (t - tty >= sizeof(utmpx.ut_id)) { 273 (void)strncpy(utmpx.ut_id, t - sizeof(utmpx.ut_id), 274 sizeof(utmpx.ut_id)); 275 } else { 276 (void)strncpy(utmpx.ut_id, tty, sizeof(utmpx.ut_id)); 277 } 278 if (pututxline(&utmpx) == NULL) 279 syslog(LOG_NOTICE, "Cannot update utmpx %m"); 280 endutxent(); 281 if (updwtmpx(_PATH_WTMPX, &utmpx) != 0) 282 syslog(LOG_NOTICE, "Cannot update wtmpx %m"); 283 } 284 285 static void 286 dolastlogx(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 287 const char *hostname, const char *tty, const struct sockaddr_storage *ss, 288 const struct timeval *now) 289 { 290 struct lastlogx ll; 291 if (!quiet) { 292 if (getlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != NULL) 293 domsg(pamh, (time_t)ll.ll_tv.tv_sec, ll.ll_host, 294 sizeof(ll.ll_host), ll.ll_line, 295 sizeof(ll.ll_line)); 296 } 297 ll.ll_tv = *now; 298 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 299 300 if (hostname) 301 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 302 else 303 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 304 305 if (ss) 306 ll.ll_ss = *ss; 307 else 308 (void)memset(&ll.ll_ss, 0, sizeof(ll.ll_ss)); 309 310 if (updlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != 0) 311 syslog(LOG_NOTICE, "Cannot update lastlogx %m"); 312 PAM_LOG("Login recorded in %s", _PATH_LASTLOGX); 313 } 314 #endif 315 316 #ifdef SUPPORT_UTMP 317 static void 318 doutmp(const char *username, const char *hostname, const char *tty, 319 const struct timeval *now) 320 { 321 struct utmp utmp; 322 323 (void)memset((void *)&utmp, 0, sizeof(utmp)); 324 utmp.ut_time = now->tv_sec; 325 (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); 326 if (hostname) 327 (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); 328 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 329 login(&utmp); 330 } 331 332 static void 333 dolastlog(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 334 const char *hostname, const char *tty, const struct timeval *now) 335 { 336 struct lastlog ll; 337 int fd; 338 339 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) == -1) { 340 syslog(LOG_NOTICE, "Cannot open `%s' %m", _PATH_LASTLOG); 341 return; 342 } 343 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 344 345 if (!quiet) { 346 if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && 347 ll.ll_time != 0) 348 domsg(pamh, ll.ll_time, ll.ll_host, 349 sizeof(ll.ll_host), ll.ll_line, 350 sizeof(ll.ll_line)); 351 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 352 } 353 354 ll.ll_time = now->tv_sec; 355 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 356 357 if (hostname) 358 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 359 else 360 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 361 362 (void)write(fd, &ll, sizeof(ll)); 363 (void)close(fd); 364 365 PAM_LOG("Login recorded in %s", _PATH_LASTLOG); 366 } 367 #endif 368 369 PAM_MODULE_ENTRY("pam_lastlog"); 370
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