1 /*- 2 * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 2001 Mark R V Murray 5 * All rights reserved. 6 * Copyright (c) 2001 Networks Associates Technology, Inc. 7 * All rights reserved. 8 * Copyright (c) 2004 Joe R. Doupnik 9 * All rights reserved. 10 * 11 * Portions of this software were developed for the FreeBSD Project by 12 * ThinkSec AS and NAI Labs, the Security Research Division of Network 13 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 14 * ("CBOSS"), as part of the DARPA CHATS research program. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 2. Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 3. The name of the author may not be used to endorse or promote 25 * products derived from this software without specific prior written 26 * permission. 27 * 4. Neither the name of the University nor the names of its contributors 28 * may be used to endorse or promote products derived from this software 29 * without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 34 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 41 * SUCH DAMAGE. 42 * 43 * $FreeBSD: src/lib/libpam/modules/pam_lastlog/pam_lastlog.c,v 1.23 2007/07/22 15:17:29 des Exp $ 44 */ 45 46 #define _BSD_SOURCE 47 48 #include <sys/param.h> 49 50 #include <fcntl.h> 51 #include <libutil.h> 52 #include <paths.h> 53 #include <pwd.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <syslog.h> 58 #include <time.h> 59 #include <unistd.h> 60 #include <utmpx.h> 61 62 #define PAM_SM_SESSION 63 64 #include <security/pam_appl.h> 65 #include <security/pam_modules.h> 66 #include <security/pam_mod_misc.h> 67 68 static void doutmpx(const char *, const char *, const char *, 69 const struct sockaddr_storage *ss, const struct timeval *); 70 static void dolastlogx(pam_handle_t *, int, const struct passwd *, const char *, 71 const char *, const struct sockaddr_storage *ss, const struct timeval *); 72 static void domsg(pam_handle_t *, time_t, const char *, size_t, const char *, 73 size_t); 74 static void logit(int, const char *, ...) __printflike(2, 3); 75 76 static void 77 logit(int level, const char *fmt, ...) 78 { 79 va_list ap; 80 81 openlog("pam_lastlog", LOG_PID, LOG_AUTHPRIV); 82 va_start(ap, fmt); 83 vsyslog(level, fmt, ap); 84 va_end(ap); 85 closelog(); 86 } 87 88 89 PAM_EXTERN int 90 pam_sm_open_session(pam_handle_t *pamh, int flags, 91 int argc __unused, const char *argv[] __unused) 92 { 93 struct passwd *pwd, pwres; 94 struct timeval now; 95 const char *user, *rhost, *tty; 96 const void *vrhost, *vtty; 97 int pam_err; 98 int quiet; 99 char pwbuf[1024]; 100 #ifdef LOGIN_CAP 101 login_cap_t *lc; 102 #endif 103 104 pam_err = pam_get_user(pamh, &user, NULL); 105 if (pam_err != PAM_SUCCESS) 106 return pam_err; 107 108 if (user == NULL || 109 getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 || 110 pwd == NULL) 111 return PAM_SERVICE_ERR; 112 113 PAM_LOG("Got user: %s", user); 114 115 pam_err = pam_get_item(pamh, PAM_RHOST, &vrhost); 116 if (pam_err != PAM_SUCCESS) 117 goto err; 118 rhost = (const char *)vrhost; 119 120 pam_err = pam_get_item(pamh, PAM_TTY, &vtty); 121 if (pam_err != PAM_SUCCESS) 122 goto err; 123 tty = (const char *)vtty; 124 125 if (tty == NULL) { 126 PAM_LOG("No PAM_TTY"); 127 pam_err = PAM_SERVICE_ERR; 128 goto err; 129 } 130 131 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 132 tty = tty + strlen(_PATH_DEV); 133 134 if (*tty == '\0') { 135 pam_err = PAM_SERVICE_ERR; 136 goto err; 137 } 138 139 (void)gettimeofday(&now, NULL); 140 141 if ((flags & PAM_SILENT) != 0) 142 quiet = 1; 143 else { 144 #ifdef LOGIN_CAP 145 lc = login_getpwclass(pwd); 146 quiet = login_getcapbool(lc, "hushlogin", 0); 147 login_close(lc); 148 #else 149 quiet = 0; 150 #endif 151 } 152 dolastlogx(pamh, quiet, pwd, rhost, tty, NULL, &now); 153 doutmpx(user, rhost, tty, NULL, &now); 154 quiet = 1; 155 err: 156 if (openpam_get_option(pamh, "no_fail")) 157 return PAM_SUCCESS; 158 return pam_err; 159 } 160 161 PAM_EXTERN int 162 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, 163 int argc __unused, const char *argv[] __unused) 164 { 165 const void *vtty; 166 const char *tty; 167 168 pam_get_item(pamh, PAM_TTY, &vtty); 169 if (vtty == NULL) 170 return PAM_SERVICE_ERR; 171 tty = (const char *)vtty; 172 173 if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0) 174 tty = tty + strlen(_PATH_DEV); 175 176 if (*tty == '\0') 177 return PAM_SERVICE_ERR; 178 179 if (logoutx(tty, 0, DEAD_PROCESS)) 180 logwtmpx(tty, "", "", 0, DEAD_PROCESS); 181 else 182 logit(LOG_NOTICE, "%s(): no utmpx record for %s", 183 __func__, tty); 184 185 return PAM_SUCCESS; 186 } 187 188 static void 189 domsg(pam_handle_t *pamh, time_t t, const char *host, size_t hsize, 190 const char *line, size_t lsize) 191 { 192 char buf[MAXHOSTNAMELEN + 32], *promptresp = NULL; 193 int pam_err; 194 195 if (*host) { 196 (void)snprintf(buf, sizeof(buf), "from %.*s ", 197 (int)hsize, host); 198 host = buf; 199 } 200 201 pam_err = pam_prompt(pamh, PAM_TEXT_INFO, &promptresp, 202 "Last login: %.24s %son %.*s\n", ctime(&t), host, (int)lsize, line); 203 204 if (pam_err == PAM_SUCCESS && promptresp) 205 free(promptresp); 206 } 207 208 static void 209 doutmpx(const char *username, const char *hostname, const char *tty, 210 const struct sockaddr_storage *ss, const struct timeval *now) 211 { 212 struct utmpx utmpx; 213 const char *t; 214 215 memset((void *)&utmpx, 0, sizeof(utmpx)); 216 utmpx.ut_tv = *now; 217 (void)strncpy(utmpx.ut_name, username, sizeof(utmpx.ut_name)); 218 if (hostname) { 219 (void)strncpy(utmpx.ut_host, hostname, sizeof(utmpx.ut_host)); 220 if (ss) 221 utmpx.ut_ss = *ss; 222 } 223 (void)strncpy(utmpx.ut_line, tty, sizeof(utmpx.ut_line)); 224 utmpx.ut_type = USER_PROCESS; 225 utmpx.ut_pid = getpid(); 226 t = tty + strlen(tty); 227 if ((size_t)(t - tty) >= sizeof(utmpx.ut_id)) { 228 (void)strncpy(utmpx.ut_id, t - sizeof(utmpx.ut_id), 229 sizeof(utmpx.ut_id)); 230 } else { 231 (void)strncpy(utmpx.ut_id, tty, sizeof(utmpx.ut_id)); 232 } 233 if (pututxline(&utmpx) == NULL) 234 logit(LOG_NOTICE, "Cannot update utmpx %m"); 235 endutxent(); 236 if (_updwtmpx(_PATH_WTMPX, &utmpx) != 0) 237 logit(LOG_NOTICE, "Cannot update wtmpx %m"); 238 } 239 240 static void 241 dolastlogx(pam_handle_t *pamh, int quiet, const struct passwd *pwd, 242 const char *hostname __unused, const char *tty __unused, 243 const struct sockaddr_storage *ss __unused, 244 const struct timeval *now __unused) 245 { 246 struct lastlogx ll; 247 if (!quiet) { 248 if (getlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != NULL) 249 domsg(pamh, (time_t)ll.ll_tv.tv_sec, ll.ll_host, 250 sizeof(ll.ll_host), ll.ll_line, 251 sizeof(ll.ll_line)); 252 } 253 #if 0 254 ll.ll_tv = *now; 255 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 256 257 if (hostname) 258 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 259 else 260 (void)memset(ll.ll_host, 0, sizeof(ll.ll_host)); 261 262 if (ss) 263 ll.ll_ss = *ss; 264 else 265 (void)memset(&ll.ll_ss, 0, sizeof(ll.ll_ss)); 266 267 if (updlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != 0) 268 logit(LOG_NOTICE, "Cannot update lastlogx %m"); 269 PAM_LOG("Login recorded in %s", _PATH_LASTLOGX); 270 #endif 271 } 272 273 PAM_MODULE_ENTRY("pam_lastlog"); 274