pam_lastlog.c revision 1.7
1 /* $NetBSD: pam_lastlog.c,v 1.7 2005/03/31 15:11:54 thorpej 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 1.7 2005/03/31 15:11:54 thorpej 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 return PAM_SERVICE_ERR; 115 116 PAM_LOG("Got user: %s", user); 117 118 pam_err = pam_get_item(pamh, PAM_RHOST, &vrhost); 119 if (pam_err != PAM_SUCCESS) 120 goto err; 121 rhost = (const char *)vrhost; 122 123 pam_err = pam_get_item(pamh, PAM_SOCKADDR, &vss); 124 if (pam_err != PAM_SUCCESS) 125 goto err; 126 ss = (const struct sockaddr_storage *)vss; 127 128 pam_err = pam_get_item(pamh, PAM_TTY, &vtty); 129 if (pam_err != PAM_SUCCESS) 130 goto err; 131 tty = (const char *)vtty; 132 133 if (tty == NULL) { 134 pam_err = PAM_SERVICE_ERR; 135 goto err; 136 } 137 138 if (pam_get_item(pamh, PAM_NUSER, &vnuser) != PAM_SUCCESS) 139 nuser = NULL; 140 else 141 nuser = (const char *)vnuser; 142 143 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 144 tty = tty + strlen(_PATH_DEV); 145 146 if (*tty == '\0') { 147 pam_err = PAM_SERVICE_ERR; 148 goto err; 149 } 150 151 (void)gettimeofday(&now, NULL); 152 153 if (openpam_get_option(pamh, "no_nested") == NULL || nuser == NULL) { 154 int quiet; 155 #ifdef LOGIN_CAP 156 quiet = login_getcapbool(login_getpwclass(pwd), "hushlogin", 0); 157 #else 158 quiet = 0; 159 #endif 160 #ifdef SUPPORT_UTMPX 161 doutmpx(user, rhost, tty, ss, &now); 162 dolastlogx(pamh, quiet, pwd, rhost, tty, ss, &now); 163 quiet = 1; 164 #endif 165 #ifdef SUPPORT_UTMP 166 doutmp(user, rhost, tty, &now); 167 dolastlog(pamh, quiet, pwd, rhost, tty, &now); 168 #endif 169 } 170 err: 171 if (openpam_get_option(pamh, "no_fail")) 172 return PAM_SUCCESS; 173 return pam_err; 174 } 175 176 PAM_EXTERN int 177 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, 178 int argc __unused, const char *argv[] __unused) 179 { 180 const void *vtty, *vnuser; 181 const char *tty, *nuser; 182 183 if (pam_get_item(pamh, PAM_NUSER, &vnuser) != PAM_SUCCESS) 184 nuser = NULL; 185 else 186 nuser = (const char *)vnuser; 187 188 pam_get_item(pamh, PAM_TTY, &vtty); 189 if (vtty == NULL) 190 return PAM_SERVICE_ERR; 191 tty = (const char *)vtty; 192 193 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 194 tty = tty + strlen(_PATH_DEV); 195 196 if (*tty == '\0') 197 return PAM_SERVICE_ERR; 198 199 if (openpam_get_option(pamh, "no_nested") == NULL || nuser == NULL) { 200 201 #ifdef SUPPORT_UTMPX 202 if (logoutx(tty, 0, DEAD_PROCESS)) 203 logwtmpx(tty, "", "", 0, DEAD_PROCESS); 204 else 205 syslog(LOG_NOTICE, "%s(): no utmpx record for %s", 206 __func__, tty); 207 #endif 208 209 #ifdef SUPPORT_UTMP 210 if (logout(tty)) 211 logwtmp(tty, "", ""); 212 else 213 syslog(LOG_NOTICE, "%s(): no utmp record for %s", 214 __func__, tty); 215 #endif 216 } 217 return PAM_SUCCESS; 218 } 219 220 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 221 static void 222 domsg(pam_handle_t *pamh, time_t t, const char *host, size_t hsize, 223 const char *line, size_t lsize) 224 { 225 char buf[MAXHOSTNAMELEN + 32], *promptresp = NULL; 226 int pam_err; 227 228 if (*host) { 229 (void)snprintf(buf, sizeof(buf), "from %.*s ", 230 (int)hsize, host); 231 host = buf; 232 } 233 234 pam_err = pam_prompt(pamh, PAM_TEXT_INFO, &promptresp, 235 "Last login: %.24s %son %.*s\n", ctime(&t), host, (int)lsize, line); 236 237 if (pam_err == PAM_SUCCESS && promptresp) 238 free(promptresp); 239 } 240 #endif 241 242 #ifdef SUPPORT_UTMPX 243 static void 244 doutmpx(const char *username, const char *hostname, const char *tty, 245 const struct sockaddr_storage *ss, const struct timeval *now) 246 { 247 struct utmpx utmpx; 248 const char *t; 249 250 memset((void *)&utmpx, 0, sizeof(utmpx)); 251 utmpx.ut_tv = *now; 252 (void)strncpy(utmpx.ut_name, username, sizeof(utmpx.ut_name)); 253 if (hostname) { 254 (void)strncpy(utmpx.ut_host, hostname, sizeof(utmpx.ut_host)); 255 if (ss) 256 utmpx.ut_ss = *ss; 257 } 258 (void)strncpy(utmpx.ut_line, tty, sizeof(utmpx.ut_line)); 259 utmpx.ut_type = USER_PROCESS; 260 utmpx.ut_pid = getpid(); 261 t = tty + strlen(tty); 262 if (t - tty >= sizeof(utmpx.ut_id)) { 263 (void)strncpy(utmpx.ut_id, t - sizeof(utmpx.ut_id), 264 sizeof(utmpx.ut_id)); 265 } else { 266 (void)strncpy(utmpx.ut_id, tty, sizeof(utmpx.ut_id)); 267 } 268 if (pututxline(&utmpx) == NULL) 269 syslog(LOG_NOTICE, "Cannot update utmpx %m"); 270 endutxent(); 271 if (updwtmpx(_PATH_WTMPX, &utmpx) != 0) 272 syslog(LOG_NOTICE, "Cannot update wtmpx %m"); 273 } 274 275 static void 276 dolastlogx(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 277 const char *hostname, const char *tty, const struct sockaddr_storage *ss, 278 const struct timeval *now) 279 { 280 struct lastlogx ll; 281 if (!quiet) { 282 if (getlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != NULL) 283 domsg(pamh, (time_t)ll.ll_tv.tv_sec, ll.ll_host, 284 sizeof(ll.ll_host), ll.ll_line, 285 sizeof(ll.ll_line)); 286 } 287 ll.ll_tv = *now; 288 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 289 290 if (hostname) 291 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 292 else 293 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 294 295 if (ss) 296 ll.ll_ss = *ss; 297 else 298 (void)memset(&ll.ll_ss, 0, sizeof(ll.ll_ss)); 299 300 if (updlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != 0) 301 syslog(LOG_NOTICE, "Cannot update lastlogx %m"); 302 PAM_LOG("Login recorded in %s", _PATH_LASTLOGX); 303 } 304 #endif 305 306 #ifdef SUPPORT_UTMP 307 static void 308 doutmp(const char *username, const char *hostname, const char *tty, 309 const struct timeval *now) 310 { 311 struct utmp utmp; 312 313 (void)memset((void *)&utmp, 0, sizeof(utmp)); 314 utmp.ut_time = now->tv_sec; 315 (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); 316 if (hostname) 317 (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); 318 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 319 login(&utmp); 320 } 321 322 static void 323 dolastlog(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 324 const char *hostname, const char *tty, const struct timeval *now) 325 { 326 struct lastlog ll; 327 int fd; 328 329 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) == -1) { 330 syslog(LOG_NOTICE, "Cannot open `%s' %m", _PATH_LASTLOG); 331 return; 332 } 333 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 334 335 if (!quiet) { 336 if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && 337 ll.ll_time != 0) 338 domsg(pamh, ll.ll_time, ll.ll_host, 339 sizeof(ll.ll_host), ll.ll_line, 340 sizeof(ll.ll_line)); 341 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 342 } 343 344 ll.ll_time = now->tv_sec; 345 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 346 347 if (hostname) 348 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 349 else 350 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 351 352 (void)write(fd, &ll, sizeof(ll)); 353 (void)close(fd); 354 355 PAM_LOG("Login recorded in %s", _PATH_LASTLOG); 356 } 357 #endif 358 359 PAM_MODULE_ENTRY("pam_lastlog"); 360
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