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[] = "@(#)lock.c 5.13 (Berkeley) 6/1/90"; 42 #endif /* not lint */ 43 44 /* 45 * Lock a terminal up until the given key is entered, until the root 46 * password is entered, or the given interval times out. 47 * 48 * Timeout interval is by default TIMEOUT, it can be changed with 49 * an argument of the form -time where time is in minutes 50 */ 51 52 #include <sys/param.h> 53 #include <sys/stat.h> 54 #include <sys/time.h> 55 #include <sys/signal.h> 56 #include <sgtty.h> 57 #include <pwd.h> 58 #include <stdio.h> 59 #include <ctype.h> 60 #include <string.h> 61 62 #define TIMEOUT 15 63 64 void quit(), bye(), hi(); 65 66 struct timeval timeout; 67 struct timeval zerotime; 68 struct sgttyb tty, ntty; 69 long nexttime; /* keep the timeout time */ 70 71 /*ARGSUSED*/ 72 main(argc, argv) 73 int argc; 74 char **argv; 75 { 76 extern char *optarg; 77 extern int errno, optind; 78 struct passwd *pw; 79 struct timeval timval; 80 struct itimerval ntimer, otimer; 81 struct tm *timp; 82 int ch, sectimeout, usemine; 83 char *ap, *mypw, *ttynam, *tzn; 84 char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ]; 85 char *crypt(), *ttyname(); 86 87 sectimeout = TIMEOUT; 88 mypw = NULL; 89 usemine = 0; 90 while ((ch = getopt(argc, argv, "pt:")) != EOF) 91 switch((char)ch) { 92 case 't': 93 if ((sectimeout = atoi(optarg)) <= 0) { 94 (void)fprintf(stderr, 95 "lock: illegal timeout value.\n"); 96 exit(1); 97 } 98 break; 99 case 'p': 100 usemine = 1; 101 if (!(pw = getpwuid(getuid()))) { 102 (void)fprintf(stderr, 103 "lock: unknown uid %d.\n", getuid()); 104 exit(1); 105 } 106 mypw = strdup(pw->pw_passwd); 107 break; 108 case '?': 109 default: 110 (void)fprintf(stderr, 111 "usage: lock [-p] [-t timeout]\n"); 112 exit(1); 113 } 114 timeout.tv_sec = sectimeout * 60; 115 116 setuid(getuid()); /* discard privs */ 117 118 if (ioctl(0, TIOCGETP, &tty)) /* get information for header */ 119 exit(1); 120 gethostname(hostname, sizeof(hostname)); 121 if (!(ttynam = ttyname(0))) { 122 (void)printf("lock: not a terminal?\n"); 123 exit(1); 124 } 125 if (gettimeofday(&timval, (struct timezone *)NULL)) { 126 (void)fprintf(stderr, 127 "lock: gettimeofday: %s\n", strerror(errno)); 128 exit(1); 129 } 130 nexttime = timval.tv_sec + (sectimeout * 60); 131 timp = localtime(&timval.tv_sec); 132 ap = asctime(timp); 133 tzn = timp->tm_zone; 134 135 (void)signal(SIGINT, quit); 136 (void)signal(SIGQUIT, quit); 137 ntty = tty; ntty.sg_flags &= ~ECHO; 138 (void)ioctl(0, TIOCSETP, &ntty); 139 140 if (!mypw) { 141 /* get key and check again */ 142 (void)printf("Key: "); 143 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 144 quit(); 145 (void)printf("\nAgain: "); 146 /* 147 * Don't need EOF test here, if we get EOF, then s1 != s 148 * and the right things will happen. 149 */ 150 (void)fgets(s1, sizeof(s1), stdin); 151 (void)putchar('\n'); 152 if (strcmp(s1, s)) { 153 (void)printf("\07lock: passwords didn't match.\n"); 154 ioctl(0, TIOCSETP, &tty); 155 exit(1); 156 } 157 s[0] = NULL; 158 mypw = s1; 159 } 160 161 /* set signal handlers */ 162 (void)signal(SIGINT, hi); 163 (void)signal(SIGQUIT, hi); 164 (void)signal(SIGTSTP, hi); 165 (void)signal(SIGALRM, bye); 166 167 ntimer.it_interval = zerotime; 168 ntimer.it_value = timeout; 169 setitimer(ITIMER_REAL, &ntimer, &otimer); 170 171 /* header info */ 172 (void)printf("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s", 173 ttynam, hostname, sectimeout, ap, tzn, ap + 19); 174 175 for (;;) { 176 (void)printf("Key: "); 177 if (!fgets(s, sizeof(s), stdin)) { 178 clearerr(stdin); 179 hi(); 180 continue; 181 } 182 if (usemine) { 183 s[strlen(s) - 1] = '\0'; 184 if (!strcmp(mypw, crypt(s, mypw))) 185 break; 186 } 187 else if (!strcmp(s, s1)) 188 break; 189 (void)printf("\07\n"); 190 if (ioctl(0, TIOCGETP, &ntty)) 191 exit(1); 192 } 193 quit(); 194 } 195 196 void 197 hi() 198 { 199 struct timeval timval; 200 201 if (!gettimeofday(&timval, (struct timezone *)NULL)) 202 (void)printf("lock: type in the unlock key. timeout in %ld:%ld minutes\n", 203 (nexttime - timval.tv_sec) / 60, (nexttime - timval.tv_sec) % 60); 204 } 205 206 void 207 quit() 208 { 209 (void)putchar('\n'); 210 (void)ioctl(0, TIOCSETP, &tty); 211 exit(0); 212 } 213 214 void 215 bye() 216 { 217 (void)ioctl(0, TIOCSETP, &tty); 218 (void)printf("lock: timeout\n"); 219 exit(1); 220 } 221