1 /* $OpenBSD: lock.c,v 1.26 2010/06/13 15:26:06 tobias Exp $ */ 2 /* $NetBSD: lock.c,v 1.8 1996/05/07 18:32:31 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1980, 1987, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Bob Toxen. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 /* 37 * Lock a terminal up until the given key is entered, until the root 38 * password is entered, or the given interval times out. 39 * 40 * Timeout interval is by default TIMEOUT, it can be changed with 41 * an argument of the form -time where time is in minutes 42 */ 43 44 #include <sys/param.h> 45 #include <sys/stat.h> 46 #include <sys/time.h> 47 #include <signal.h> 48 49 #include <ctype.h> 50 #include <err.h> 51 #include <pwd.h> 52 #include <readpassphrase.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <termios.h> 57 #include <unistd.h> 58 59 #include <login_cap.h> 60 #include <bsd_auth.h> 61 62 #define TIMEOUT 15 63 64 void bye(int); 65 void hi(int); 66 67 struct timeval timeout; 68 struct timeval zerotime; 69 time_t nexttime; /* keep the timeout time */ 70 int no_timeout; /* lock terminal forever */ 71 72 extern char *__progname; 73 74 /*ARGSUSED*/ 75 int 76 main(int argc, char *argv[]) 77 { 78 char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ], date[256]; 79 char *p, *style, *nstyle, *ttynam; 80 struct itimerval ntimer, otimer; 81 int ch, sectimeout, usemine, cnt, tries = 10, backoff = 3; 82 const char *errstr; 83 struct passwd *pw; 84 struct tm *timp; 85 time_t curtime; 86 login_cap_t *lc; 87 88 sectimeout = TIMEOUT; 89 style = NULL; 90 usemine = 0; 91 no_timeout = 0; 92 93 if (!(pw = getpwuid(getuid()))) 94 errx(1, "unknown uid %u.", getuid()); 95 96 lc = login_getclass(pw->pw_class); 97 if (lc != NULL) { 98 /* 99 * We allow "login-tries" attempts to login but start 100 * slowing down after "login-backoff" attempts. 101 */ 102 tries = (int)login_getcapnum(lc, "login-tries", 10, 10); 103 backoff = (int)login_getcapnum(lc, "login-backoff", 3, 3); 104 } 105 106 while ((ch = getopt(argc, argv, "a:npt:")) != -1) 107 switch (ch) { 108 case 'a': 109 if (lc) { 110 style = login_getstyle(lc, optarg, "auth-lock"); 111 if (style == NULL) 112 errx(1, 113 "invalid authentication style: %s", 114 optarg); 115 } 116 usemine = 1; 117 break; 118 case 't': 119 sectimeout = (int)strtonum(optarg, 1, INT_MAX, &errstr); 120 if (errstr) 121 errx(1, "timeout %s: %s", errstr, optarg); 122 break; 123 case 'p': 124 usemine = 1; 125 break; 126 case 'n': 127 no_timeout = 1; 128 break; 129 default: 130 (void)fprintf(stderr, 131 "usage: %s [-np] [-a style] [-t timeout]\n", 132 __progname); 133 exit(1); 134 } 135 timeout.tv_sec = sectimeout * 60; 136 137 gethostname(hostname, sizeof(hostname)); 138 if (usemine && lc == NULL) 139 errx(1, "login class not found"); 140 if (!(ttynam = ttyname(STDIN_FILENO))) 141 errx(1, "not a terminal?"); 142 curtime = time(NULL); 143 nexttime = curtime + (sectimeout * 60); 144 timp = localtime(&curtime); 145 strftime(date, sizeof(date), "%c", timp); 146 147 if (!usemine) { 148 /* get key and check again */ 149 if (!readpassphrase("Key: ", s, sizeof(s), RPP_ECHO_OFF) || 150 *s == '\0') 151 exit(0); 152 /* 153 * Don't need EOF test here, if we get EOF, then s1 != s 154 * and the right things will happen. 155 */ 156 (void)readpassphrase("Again: ", s1, sizeof(s1), RPP_ECHO_OFF); 157 if (strcmp(s1, s)) { 158 warnx("\apasswords didn't match."); 159 exit(1); 160 } 161 s[0] = '\0'; 162 } 163 164 /* set signal handlers */ 165 (void)signal(SIGINT, hi); 166 (void)signal(SIGQUIT, hi); 167 (void)signal(SIGTSTP, hi); 168 (void)signal(SIGALRM, bye); 169 170 ntimer.it_interval = zerotime; 171 ntimer.it_value = timeout; 172 if (!no_timeout) 173 setitimer(ITIMER_REAL, &ntimer, &otimer); 174 175 /* header info */ 176 if (no_timeout) { 177 (void)fprintf(stderr, 178 "%s: %s on %s. no timeout\ntime now is %s\n", 179 __progname, ttynam, hostname, date); 180 } else { 181 (void)fprintf(stderr, 182 "%s: %s on %s. timeout in %d minutes\ntime now is %s\n", 183 __progname, ttynam, hostname, sectimeout, date); 184 } 185 186 for (cnt = 0;;) { 187 if (!readpassphrase("Key: ", s, sizeof(s), RPP_ECHO_OFF) || 188 *s == '\0') { 189 hi(0); 190 continue; 191 } 192 if (usemine) { 193 /* 194 * If user entered 's/key' or the style specified via 195 * the '-a' argument, auth_userokay() will prompt 196 * for a new password. Otherwise, use what we have. 197 */ 198 if ((strcmp(s, "s/key") == 0 && 199 (nstyle = login_getstyle(lc, "skey", "auth-lock"))) 200 || ((nstyle = style) && strcmp(s, nstyle) == 0)) 201 p = NULL; 202 else 203 p = s; 204 if (auth_userokay(pw->pw_name, nstyle, "auth-lock", p)) 205 break; 206 } else if (strcmp(s, s1) == 0) 207 break; 208 (void)putc('\a', stderr); 209 cnt %= tries; 210 if (++cnt > backoff) { 211 sigset_t set, oset; 212 sigfillset(&set); 213 sigprocmask(SIG_BLOCK, &set, &oset); 214 sleep((u_int)((cnt - backoff) * tries / 2)); 215 sigprocmask(SIG_SETMASK, &oset, NULL); 216 } 217 } 218 219 exit(0); 220 } 221 222 /*ARGSUSED*/ 223 void 224 hi(int signo) 225 { 226 char buf[1024], buf2[1024]; 227 time_t now; 228 229 if (no_timeout) 230 buf2[0] = '\0'; 231 else { 232 now = time(NULL); 233 (void)snprintf(buf2, sizeof buf2, " timeout in %d:%d minutes", 234 (nexttime - now) / 60, (nexttime - now) % 60); 235 } 236 (void)snprintf(buf, sizeof buf, "%s: type in the unlock key.%s\n", 237 __progname, buf2); 238 (void) write(STDERR_FILENO, buf, strlen(buf)); 239 } 240 241 /*ARGSUSED*/ 242 void 243 bye(int signo) 244 { 245 246 if (!no_timeout) 247 warnx("timeout"); 248 _exit(1); 249 } 250