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 37 #ifndef lint 38 static const char copyright[] = 39 "@(#) Copyright (c) 1980, 1987, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)lock.c 8.1 (Berkeley) 6/6/93"; 46 #endif 47 #endif /* not lint */ 48 #include <sys/cdefs.h> 49 __FBSDID("$FreeBSD$"); 50 51 /* 52 * Lock a terminal up until the given key is entered or the given 53 * interval times out. 54 * 55 * Timeout interval is by default TIMEOUT, it can be changed with 56 * an argument of the form -time where time is in minutes 57 */ 58 59 #include <sys/param.h> 60 #include <sys/stat.h> 61 #include <sys/time.h> 62 #include <sys/signal.h> 63 #include <sys/consio.h> 64 #include <err.h> 65 #include <ctype.h> 66 #include <pwd.h> 67 #include <sgtty.h> 68 #include <stdio.h> 69 #include <stdlib.h> 70 #include <string.h> 71 #include <syslog.h> 72 #include <unistd.h> 73 #include <varargs.h> 74 75 #define TIMEOUT 15 76 77 void quit(int); 78 void bye(int); 79 void hi(int); 80 static void usage(void); 81 82 struct timeval timeout; 83 struct timeval zerotime; 84 struct sgttyb tty, ntty; 85 long nexttime; /* keep the timeout time */ 86 int no_timeout; /* lock terminal forever */ 87 int vtyunlock; /* Unlock flag and code. */ 88 89 /*ARGSUSED*/ 90 int 91 main(argc, argv) 92 int argc; 93 char **argv; 94 { 95 struct passwd *pw; 96 struct timeval timval; 97 time_t timval_sec; 98 struct itimerval ntimer, otimer; 99 struct tm *timp; 100 int ch, failures, sectimeout, usemine, vtylock; 101 char *ap, *mypw, *ttynam, *tzn; 102 char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ]; 103 104 openlog("lock", LOG_ODELAY, LOG_AUTH); 105 106 sectimeout = TIMEOUT; 107 mypw = NULL; 108 usemine = 0; 109 no_timeout = 0; 110 vtylock = 0; 111 while ((ch = getopt(argc, argv, "npt:v")) != -1) 112 switch((char)ch) { 113 case 't': 114 if ((sectimeout = atoi(optarg)) <= 0) 115 errx(1, "illegal timeout value"); 116 break; 117 case 'p': 118 usemine = 1; 119 if (!(pw = getpwuid(getuid()))) 120 errx(1, "unknown uid %d", getuid()); 121 mypw = strdup(pw->pw_passwd); 122 break; 123 case 'n': 124 no_timeout = 1; 125 break; 126 case 'v': 127 vtylock = 1; 128 break; 129 case '?': 130 default: 131 usage(); 132 } 133 timeout.tv_sec = sectimeout * 60; 134 135 setuid(getuid()); /* discard privs */ 136 137 if (ioctl(0, TIOCGETP, &tty)) /* get information for header */ 138 exit(1); 139 gethostname(hostname, sizeof(hostname)); 140 if (!(ttynam = ttyname(0))) 141 errx(1, "not a terminal?"); 142 if (gettimeofday(&timval, (struct timezone *)NULL)) 143 err(1, "gettimeofday"); 144 nexttime = timval.tv_sec + (sectimeout * 60); 145 timval_sec = timval.tv_sec; 146 timp = localtime(&timval_sec); 147 ap = asctime(timp); 148 tzn = timp->tm_zone; 149 150 (void)signal(SIGINT, quit); 151 (void)signal(SIGQUIT, quit); 152 ntty = tty; ntty.sg_flags &= ~ECHO; 153 (void)ioctl(0, TIOCSETP, &ntty); 154 155 if (!mypw) { 156 /* get key and check again */ 157 (void)printf("Key: "); 158 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 159 quit(0); 160 (void)printf("\nAgain: "); 161 /* 162 * Don't need EOF test here, if we get EOF, then s1 != s 163 * and the right things will happen. 164 */ 165 (void)fgets(s1, sizeof(s1), stdin); 166 (void)putchar('\n'); 167 if (strcmp(s1, s)) { 168 (void)printf("\07lock: passwords didn't match.\n"); 169 ioctl(0, TIOCSETP, &tty); 170 exit(1); 171 } 172 s[0] = '\0'; 173 mypw = s1; 174 } 175 176 /* set signal handlers */ 177 (void)signal(SIGINT, hi); 178 (void)signal(SIGQUIT, hi); 179 (void)signal(SIGTSTP, hi); 180 (void)signal(SIGALRM, bye); 181 182 ntimer.it_interval = zerotime; 183 ntimer.it_value = timeout; 184 if (!no_timeout) 185 setitimer(ITIMER_REAL, &ntimer, &otimer); 186 if (vtylock) { 187 /* 188 * If this failed, we want to err out; warn isn't good 189 * enough, since we don't want the user to think that 190 * everything is nice and locked because they got a 191 * "Key:" prompt. 192 */ 193 if (ioctl(0, VT_LOCKSWITCH, &vtylock) == -1) { 194 (void)ioctl(0, TIOCSETP, &tty); 195 err(1, "locking vty"); 196 } 197 vtyunlock = 0x2; 198 } 199 200 /* header info */ 201 (void)printf("lock: %s on %s.", ttynam, hostname); 202 if (no_timeout) 203 (void)printf(" no timeout."); 204 else 205 (void)printf(" timeout in %d minute%s.", sectimeout, 206 sectimeout != 1 ? "s" : ""); 207 if (vtylock) 208 (void)printf(" vty locked."); 209 (void)printf("\ntime now is %.20s%s%s", ap, tzn, ap + 19); 210 211 failures = 0; 212 213 for (;;) { 214 (void)printf("Key: "); 215 if (!fgets(s, sizeof(s), stdin)) { 216 clearerr(stdin); 217 hi(0); 218 continue; 219 } 220 if (usemine) { 221 s[strlen(s) - 1] = '\0'; 222 if (!strcmp(mypw, crypt(s, mypw))) 223 break; 224 } 225 else if (!strcmp(s, s1)) 226 break; 227 (void)printf("\07\n"); 228 failures++; 229 if (getuid() == 0) 230 syslog(LOG_NOTICE, "%d ROOT UNLOCK FAILURE%s (%s on %s)", 231 failures, failures > 1 ? "S": "", ttynam, hostname); 232 if (ioctl(0, TIOCGETP, &ntty)) 233 exit(1); 234 sleep(1); /* to discourage guessing */ 235 } 236 if (getuid() == 0) 237 syslog(LOG_NOTICE, "ROOT UNLOCK ON hostname %s port %s", 238 hostname, ttynam); 239 quit(0); 240 return(0); /* not reached */ 241 } 242 243 244 static void 245 usage() 246 { 247 (void)fprintf(stderr, "usage: lock [-npv] [-t timeout]\n"); 248 exit(1); 249 } 250 251 void 252 hi(int signo __unused) 253 { 254 struct timeval timval; 255 256 if (!gettimeofday(&timval, (struct timezone *)NULL)) { 257 (void)printf("lock: type in the unlock key. "); 258 if (no_timeout) { 259 (void)putchar('\n'); 260 } else { 261 (void)printf("timeout in %ld:%ld minutes\n", 262 (nexttime - timval.tv_sec) / 60, 263 (nexttime - timval.tv_sec) % 60); 264 } 265 } 266 } 267 268 void 269 quit(int signo __unused) 270 { 271 (void)putchar('\n'); 272 (void)ioctl(0, TIOCSETP, &tty); 273 if (vtyunlock) 274 (void)ioctl(0, VT_LOCKSWITCH, &vtyunlock); 275 exit(0); 276 } 277 278 void 279 bye(int signo __unused) 280 { 281 if (!no_timeout) { 282 (void)ioctl(0, TIOCSETP, &tty); 283 if (vtyunlock) 284 (void)ioctl(0, VT_LOCKSWITCH, &vtyunlock); 285 (void)printf("lock: timeout\n"); 286 exit(1); 287 } 288 } 289