1 /* 2 * Copyright (c) 1980, 1987 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 char copyright[] = 36 "@(#) Copyright (c) 1980, 1987 Regents of the University of California.\n\ 37 All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 /*static char sccsid[] = "from: @(#)lock.c 5.13 (Berkeley) 6/1/90";*/ 42 static char rcsid[] = "$Id: lock.c,v 1.2 1993/08/01 18:13:41 mycroft Exp $"; 43 #endif /* not lint */ 44 45 /* 46 * Lock a terminal up until the given key is entered, until the root 47 * password is entered, or the given interval times out. 48 * 49 * Timeout interval is by default TIMEOUT, it can be changed with 50 * an argument of the form -time where time is in minutes 51 */ 52 53 #include <sys/param.h> 54 #include <sys/stat.h> 55 #include <sys/time.h> 56 #include <sys/signal.h> 57 #include <sgtty.h> 58 #include <pwd.h> 59 #include <stdio.h> 60 #include <ctype.h> 61 #include <string.h> 62 63 #define TIMEOUT 15 64 65 void quit(), bye(), hi(); 66 67 struct timeval timeout; 68 struct timeval zerotime; 69 struct sgttyb tty, ntty; 70 long nexttime; /* keep the timeout time */ 71 72 /*ARGSUSED*/ 73 main(argc, argv) 74 int argc; 75 char **argv; 76 { 77 extern char *optarg; 78 extern int errno, optind; 79 struct passwd *pw; 80 struct timeval timval; 81 struct itimerval ntimer, otimer; 82 struct tm *timp; 83 int ch, sectimeout, usemine; 84 char *ap, *mypw, *ttynam, *tzn; 85 char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ]; 86 char *crypt(), *ttyname(); 87 88 sectimeout = TIMEOUT; 89 mypw = NULL; 90 usemine = 0; 91 while ((ch = getopt(argc, argv, "pt:")) != EOF) 92 switch((char)ch) { 93 case 't': 94 if ((sectimeout = atoi(optarg)) <= 0) { 95 (void)fprintf(stderr, 96 "lock: illegal timeout value.\n"); 97 exit(1); 98 } 99 break; 100 case 'p': 101 usemine = 1; 102 if (!(pw = getpwuid(getuid()))) { 103 (void)fprintf(stderr, 104 "lock: unknown uid %d.\n", getuid()); 105 exit(1); 106 } 107 mypw = strdup(pw->pw_passwd); 108 break; 109 case '?': 110 default: 111 (void)fprintf(stderr, 112 "usage: lock [-p] [-t timeout]\n"); 113 exit(1); 114 } 115 timeout.tv_sec = sectimeout * 60; 116 117 setuid(getuid()); /* discard privs */ 118 119 if (ioctl(0, TIOCGETP, &tty)) /* get information for header */ 120 exit(1); 121 gethostname(hostname, sizeof(hostname)); 122 if (!(ttynam = ttyname(0))) { 123 (void)printf("lock: not a terminal?\n"); 124 exit(1); 125 } 126 if (gettimeofday(&timval, (struct timezone *)NULL)) { 127 (void)fprintf(stderr, 128 "lock: gettimeofday: %s\n", strerror(errno)); 129 exit(1); 130 } 131 nexttime = timval.tv_sec + (sectimeout * 60); 132 timp = localtime(&timval.tv_sec); 133 ap = asctime(timp); 134 tzn = timp->tm_zone; 135 136 (void)signal(SIGINT, quit); 137 (void)signal(SIGQUIT, quit); 138 ntty = tty; ntty.sg_flags &= ~ECHO; 139 (void)ioctl(0, TIOCSETP, &ntty); 140 141 if (!mypw) { 142 /* get key and check again */ 143 (void)printf("Key: "); 144 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 145 quit(); 146 (void)printf("\nAgain: "); 147 /* 148 * Don't need EOF test here, if we get EOF, then s1 != s 149 * and the right things will happen. 150 */ 151 (void)fgets(s1, sizeof(s1), stdin); 152 (void)putchar('\n'); 153 if (strcmp(s1, s)) { 154 (void)printf("\07lock: passwords didn't match.\n"); 155 ioctl(0, TIOCSETP, &tty); 156 exit(1); 157 } 158 s[0] = NULL; 159 mypw = s1; 160 } 161 162 /* set signal handlers */ 163 (void)signal(SIGINT, hi); 164 (void)signal(SIGQUIT, hi); 165 (void)signal(SIGTSTP, hi); 166 (void)signal(SIGALRM, bye); 167 168 ntimer.it_interval = zerotime; 169 ntimer.it_value = timeout; 170 setitimer(ITIMER_REAL, &ntimer, &otimer); 171 172 /* header info */ 173 (void)printf("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s", 174 ttynam, hostname, sectimeout, ap, tzn, ap + 19); 175 176 for (;;) { 177 (void)printf("Key: "); 178 if (!fgets(s, sizeof(s), stdin)) { 179 clearerr(stdin); 180 hi(); 181 continue; 182 } 183 if (usemine) { 184 s[strlen(s) - 1] = '\0'; 185 if (!strcmp(mypw, crypt(s, mypw))) 186 break; 187 } 188 else if (!strcmp(s, s1)) 189 break; 190 (void)printf("\07\n"); 191 if (ioctl(0, TIOCGETP, &ntty)) 192 exit(1); 193 } 194 quit(); 195 } 196 197 void 198 hi() 199 { 200 struct timeval timval; 201 202 if (!gettimeofday(&timval, (struct timezone *)NULL)) 203 (void)printf("lock: type in the unlock key. timeout in %ld:%ld minutes\n", 204 (nexttime - timval.tv_sec) / 60, (nexttime - timval.tv_sec) % 60); 205 } 206 207 void 208 quit() 209 { 210 (void)putchar('\n'); 211 (void)ioctl(0, TIOCSETP, &tty); 212 exit(0); 213 } 214 215 void 216 bye() 217 { 218 (void)ioctl(0, TIOCSETP, &tty); 219 (void)printf("lock: timeout\n"); 220 exit(1); 221 } 222