1 /* 2 * Copyright (c) 1980, 1987, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Bob Toxen. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#) Copyright (c) 1980, 1987, 1993 The Regents of the University of California. All rights reserved. 37 * @(#)lock.c 8.1 (Berkeley) 6/6/93 38 * $FreeBSD: src/usr.bin/lock/lock.c,v 1.8.2.1 2002/09/15 22:32:56 dd Exp $ 39 * $DragonFly: src/usr.bin/lock/lock.c,v 1.2 2003/06/17 04:29:28 dillon Exp $ 40 */ 41 42 /* 43 * Lock a terminal up until the given key is entered or the given 44 * interval times out. 45 * 46 * Timeout interval is by default TIMEOUT, it can be changed with 47 * an argument of the form -time where time is in minutes 48 */ 49 50 #include <sys/param.h> 51 #include <sys/stat.h> 52 #include <sys/time.h> 53 #include <sys/signal.h> 54 #include <sys/consio.h> 55 #include <err.h> 56 #include <ctype.h> 57 #include <pwd.h> 58 #include <sgtty.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <syslog.h> 63 #include <unistd.h> 64 #include <varargs.h> 65 66 #define TIMEOUT 15 67 68 void quit(int); 69 void bye(int); 70 void hi(int); 71 static void usage(void); 72 73 struct timeval timeout; 74 struct timeval zerotime; 75 struct sgttyb tty, ntty; 76 long nexttime; /* keep the timeout time */ 77 int no_timeout; /* lock terminal forever */ 78 int vtyunlock; /* Unlock flag and code. */ 79 80 /*ARGSUSED*/ 81 int 82 main(argc, argv) 83 int argc; 84 char **argv; 85 { 86 struct passwd *pw; 87 struct timeval timval; 88 time_t timval_sec; 89 struct itimerval ntimer, otimer; 90 struct tm *timp; 91 int ch, failures, sectimeout, usemine, vtylock; 92 char *ap, *mypw, *ttynam, *tzn; 93 char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ]; 94 95 openlog("lock", LOG_ODELAY, LOG_AUTH); 96 97 sectimeout = TIMEOUT; 98 mypw = NULL; 99 usemine = 0; 100 no_timeout = 0; 101 vtylock = 0; 102 while ((ch = getopt(argc, argv, "npt:v")) != -1) 103 switch((char)ch) { 104 case 't': 105 if ((sectimeout = atoi(optarg)) <= 0) 106 errx(1, "illegal timeout value"); 107 break; 108 case 'p': 109 usemine = 1; 110 if (!(pw = getpwuid(getuid()))) 111 errx(1, "unknown uid %d", getuid()); 112 mypw = strdup(pw->pw_passwd); 113 break; 114 case 'n': 115 no_timeout = 1; 116 break; 117 case 'v': 118 vtylock = 1; 119 break; 120 case '?': 121 default: 122 usage(); 123 } 124 timeout.tv_sec = sectimeout * 60; 125 126 setuid(getuid()); /* discard privs */ 127 128 if (ioctl(0, TIOCGETP, &tty)) /* get information for header */ 129 exit(1); 130 gethostname(hostname, sizeof(hostname)); 131 if (!(ttynam = ttyname(0))) 132 errx(1, "not a terminal?"); 133 if (gettimeofday(&timval, (struct timezone *)NULL)) 134 err(1, "gettimeofday"); 135 nexttime = timval.tv_sec + (sectimeout * 60); 136 timval_sec = timval.tv_sec; 137 timp = localtime(&timval_sec); 138 ap = asctime(timp); 139 tzn = timp->tm_zone; 140 141 (void)signal(SIGINT, quit); 142 (void)signal(SIGQUIT, quit); 143 ntty = tty; ntty.sg_flags &= ~ECHO; 144 (void)ioctl(0, TIOCSETP, &ntty); 145 146 if (!mypw) { 147 /* get key and check again */ 148 (void)printf("Key: "); 149 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 150 quit(0); 151 (void)printf("\nAgain: "); 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)fgets(s1, sizeof(s1), stdin); 157 (void)putchar('\n'); 158 if (strcmp(s1, s)) { 159 (void)printf("\07lock: passwords didn't match.\n"); 160 ioctl(0, TIOCSETP, &tty); 161 exit(1); 162 } 163 s[0] = '\0'; 164 mypw = s1; 165 } 166 167 /* set signal handlers */ 168 (void)signal(SIGINT, hi); 169 (void)signal(SIGQUIT, hi); 170 (void)signal(SIGTSTP, hi); 171 (void)signal(SIGALRM, bye); 172 173 ntimer.it_interval = zerotime; 174 ntimer.it_value = timeout; 175 if (!no_timeout) 176 setitimer(ITIMER_REAL, &ntimer, &otimer); 177 if (vtylock) { 178 /* 179 * If this failed, we want to err out; warn isn't good 180 * enough, since we don't want the user to think that 181 * everything is nice and locked because they got a 182 * "Key:" prompt. 183 */ 184 if (ioctl(0, VT_LOCKSWITCH, &vtylock) == -1) { 185 (void)ioctl(0, TIOCSETP, &tty); 186 err(1, "locking vty"); 187 } 188 vtyunlock = 0x2; 189 } 190 191 /* header info */ 192 (void)printf("lock: %s on %s.", ttynam, hostname); 193 if (no_timeout) 194 (void)printf(" no timeout."); 195 else 196 (void)printf(" timeout in %d minute%s.", sectimeout, 197 sectimeout != 1 ? "s" : ""); 198 if (vtylock) 199 (void)printf(" vty locked."); 200 (void)printf("\ntime now is %.20s%s%s", ap, tzn, ap + 19); 201 202 failures = 0; 203 204 for (;;) { 205 (void)printf("Key: "); 206 if (!fgets(s, sizeof(s), stdin)) { 207 clearerr(stdin); 208 hi(0); 209 continue; 210 } 211 if (usemine) { 212 s[strlen(s) - 1] = '\0'; 213 if (!strcmp(mypw, crypt(s, mypw))) 214 break; 215 } 216 else if (!strcmp(s, s1)) 217 break; 218 (void)printf("\07\n"); 219 failures++; 220 if (getuid() == 0) 221 syslog(LOG_NOTICE, "%d ROOT UNLOCK FAILURE%s (%s on %s)", 222 failures, failures > 1 ? "S": "", ttynam, hostname); 223 if (ioctl(0, TIOCGETP, &ntty)) 224 exit(1); 225 sleep(1); /* to discourage guessing */ 226 } 227 if (getuid() == 0) 228 syslog(LOG_NOTICE, "ROOT UNLOCK ON hostname %s port %s", 229 hostname, ttynam); 230 quit(0); 231 return(0); /* not reached */ 232 } 233 234 235 static void 236 usage() 237 { 238 (void)fprintf(stderr, "usage: lock [-npv] [-t timeout]\n"); 239 exit(1); 240 } 241 242 void 243 hi(int signo __unused) 244 { 245 struct timeval timval; 246 247 if (!gettimeofday(&timval, (struct timezone *)NULL)) { 248 (void)printf("lock: type in the unlock key. "); 249 if (no_timeout) { 250 (void)putchar('\n'); 251 } else { 252 (void)printf("timeout in %ld:%ld minutes\n", 253 (nexttime - timval.tv_sec) / 60, 254 (nexttime - timval.tv_sec) % 60); 255 } 256 } 257 } 258 259 void 260 quit(int signo __unused) 261 { 262 (void)putchar('\n'); 263 (void)ioctl(0, TIOCSETP, &tty); 264 if (vtyunlock) 265 (void)ioctl(0, VT_LOCKSWITCH, &vtyunlock); 266 exit(0); 267 } 268 269 void 270 bye(int signo __unused) 271 { 272 if (!no_timeout) { 273 (void)ioctl(0, TIOCSETP, &tty); 274 if (vtyunlock) 275 (void)ioctl(0, VT_LOCKSWITCH, &vtyunlock); 276 (void)printf("lock: timeout\n"); 277 exit(1); 278 } 279 } 280