pam_lastlog.c revision 1.6
1 /* $NetBSD: pam_lastlog.c,v 1.6 2005/03/05 20:32:41 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 1.6 2005/03/05 20:32:41 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; 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; 106 107 pam_err = pam_get_user(pamh, &user, NULL); 108 if (pam_err != PAM_SUCCESS) 109 return pam_err; 110 111 if (user == NULL || (pwd = getpwnam(user)) == NULL) 112 return PAM_SERVICE_ERR; 113 114 PAM_LOG("Got user: %s", user); 115 116 pam_err = pam_get_item(pamh, PAM_RHOST, &vrhost); 117 if (pam_err != PAM_SUCCESS) 118 goto err; 119 rhost = (const char *)vrhost; 120 121 pam_err = pam_get_item(pamh, PAM_SOCKADDR, &vss); 122 if (pam_err != PAM_SUCCESS) 123 goto err; 124 ss = (const struct sockaddr_storage *)vss; 125 126 pam_err = pam_get_item(pamh, PAM_TTY, &vtty); 127 if (pam_err != PAM_SUCCESS) 128 goto err; 129 tty = (const char *)vtty; 130 131 if (tty == NULL) { 132 pam_err = PAM_SERVICE_ERR; 133 goto err; 134 } 135 136 if (pam_get_item(pamh, PAM_NUSER, &vnuser) != PAM_SUCCESS) 137 nuser = NULL; 138 else 139 nuser = (const char *)vnuser; 140 141 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 142 tty = tty + strlen(_PATH_DEV); 143 144 if (*tty == '\0') { 145 pam_err = PAM_SERVICE_ERR; 146 goto err; 147 } 148 149 (void)gettimeofday(&now, NULL); 150 151 if (openpam_get_option(pamh, "no_nested") == NULL || nuser == NULL) { 152 int quiet; 153 #ifdef LOGIN_CAP 154 quiet = login_getcapbool(login_getpwclass(pwd), "hushlogin", 0); 155 #else 156 quiet = 0; 157 #endif 158 #ifdef SUPPORT_UTMPX 159 doutmpx(user, rhost, tty, ss, &now); 160 dolastlogx(pamh, quiet, pwd, rhost, tty, ss, &now); 161 quiet = 1; 162 #endif 163 #ifdef SUPPORT_UTMP 164 doutmp(user, rhost, tty, &now); 165 dolastlog(pamh, quiet, pwd, rhost, tty, &now); 166 #endif 167 } 168 err: 169 if (openpam_get_option(pamh, "no_fail")) 170 return PAM_SUCCESS; 171 return pam_err; 172 } 173 174 PAM_EXTERN int 175 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, 176 int argc __unused, const char *argv[] __unused) 177 { 178 const void *vtty, *vnuser; 179 const char *tty, *nuser; 180 181 if (pam_get_item(pamh, PAM_NUSER, &vnuser) != PAM_SUCCESS) 182 nuser = NULL; 183 else 184 nuser = (const char *)vnuser; 185 186 pam_get_item(pamh, PAM_TTY, &vtty); 187 if (vtty == NULL) 188 return PAM_SERVICE_ERR; 189 tty = (const char *)vtty; 190 191 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 192 tty = tty + strlen(_PATH_DEV); 193 194 if (*tty == '\0') 195 return PAM_SERVICE_ERR; 196 197 if (openpam_get_option(pamh, "no_nested") == NULL || nuser == NULL) { 198 199 #ifdef SUPPORT_UTMPX 200 if (logoutx(tty, 0, DEAD_PROCESS)) 201 logwtmpx(tty, "", "", 0, DEAD_PROCESS); 202 else 203 syslog(LOG_NOTICE, "%s(): no utmpx record for %s", 204 __func__, tty); 205 #endif 206 207 #ifdef SUPPORT_UTMP 208 if (logout(tty)) 209 logwtmp(tty, "", ""); 210 else 211 syslog(LOG_NOTICE, "%s(): no utmp record for %s", 212 __func__, tty); 213 #endif 214 } 215 return PAM_SUCCESS; 216 } 217 218 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 219 static void 220 domsg(pam_handle_t *pamh, time_t t, const char *host, size_t hsize, 221 const char *line, size_t lsize) 222 { 223 char buf[MAXHOSTNAMELEN + 32], *promptresp = NULL; 224 int pam_err; 225 226 if (*host) { 227 (void)snprintf(buf, sizeof(buf), "from %.*s ", 228 (int)hsize, host); 229 host = buf; 230 } 231 232 pam_err = pam_prompt(pamh, PAM_TEXT_INFO, &promptresp, 233 "Last login: %.24s %son %.*s\n", ctime(&t), host, (int)lsize, line); 234 235 if (pam_err == PAM_SUCCESS && promptresp) 236 free(promptresp); 237 } 238 #endif 239 240 #ifdef SUPPORT_UTMPX 241 static void 242 doutmpx(const char *username, const char *hostname, const char *tty, 243 const struct sockaddr_storage *ss, const struct timeval *now) 244 { 245 struct utmpx utmpx; 246 const char *t; 247 248 memset((void *)&utmpx, 0, sizeof(utmpx)); 249 utmpx.ut_tv = *now; 250 (void)strncpy(utmpx.ut_name, username, sizeof(utmpx.ut_name)); 251 if (hostname) { 252 (void)strncpy(utmpx.ut_host, hostname, sizeof(utmpx.ut_host)); 253 if (ss) 254 utmpx.ut_ss = *ss; 255 } 256 (void)strncpy(utmpx.ut_line, tty, sizeof(utmpx.ut_line)); 257 utmpx.ut_type = USER_PROCESS; 258 utmpx.ut_pid = getpid(); 259 t = tty + strlen(tty); 260 if (t - tty >= sizeof(utmpx.ut_id)) { 261 (void)strncpy(utmpx.ut_id, t - sizeof(utmpx.ut_id), 262 sizeof(utmpx.ut_id)); 263 } else { 264 (void)strncpy(utmpx.ut_id, tty, sizeof(utmpx.ut_id)); 265 } 266 if (pututxline(&utmpx) == NULL) 267 syslog(LOG_NOTICE, "Cannot update utmpx %m"); 268 endutxent(); 269 if (updwtmpx(_PATH_WTMPX, &utmpx) != 0) 270 syslog(LOG_NOTICE, "Cannot update wtmpx %m"); 271 } 272 273 static void 274 dolastlogx(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 275 const char *hostname, const char *tty, const struct sockaddr_storage *ss, 276 const struct timeval *now) 277 { 278 struct lastlogx ll; 279 if (!quiet) { 280 if (getlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != NULL) 281 domsg(pamh, (time_t)ll.ll_tv.tv_sec, ll.ll_host, 282 sizeof(ll.ll_host), ll.ll_line, 283 sizeof(ll.ll_line)); 284 } 285 ll.ll_tv = *now; 286 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 287 288 if (hostname) 289 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 290 else 291 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 292 293 if (ss) 294 ll.ll_ss = *ss; 295 else 296 (void)memset(&ll.ll_ss, 0, sizeof(ll.ll_ss)); 297 298 if (updlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != 0) 299 syslog(LOG_NOTICE, "Cannot update lastlogx %m"); 300 PAM_LOG("Login recorded in %s", _PATH_LASTLOGX); 301 } 302 #endif 303 304 #ifdef SUPPORT_UTMP 305 static void 306 doutmp(const char *username, const char *hostname, const char *tty, 307 const struct timeval *now) 308 { 309 struct utmp utmp; 310 311 (void)memset((void *)&utmp, 0, sizeof(utmp)); 312 utmp.ut_time = now->tv_sec; 313 (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); 314 if (hostname) 315 (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); 316 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 317 login(&utmp); 318 } 319 320 static void 321 dolastlog(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 322 const char *hostname, const char *tty, const struct timeval *now) 323 { 324 struct lastlog ll; 325 int fd; 326 327 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) == -1) { 328 syslog(LOG_NOTICE, "Cannot open `%s' %m", _PATH_LASTLOG); 329 return; 330 } 331 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 332 333 if (!quiet) { 334 if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && 335 ll.ll_time != 0) 336 domsg(pamh, ll.ll_time, ll.ll_host, 337 sizeof(ll.ll_host), ll.ll_line, 338 sizeof(ll.ll_line)); 339 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 340 } 341 342 ll.ll_time = now->tv_sec; 343 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 344 345 if (hostname) 346 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 347 else 348 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 349 350 (void)write(fd, &ll, sizeof(ll)); 351 (void)close(fd); 352 353 PAM_LOG("Login recorded in %s", _PATH_LASTLOG); 354 } 355 #endif 356 357 PAM_MODULE_ENTRY("pam_lastlog"); 358
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