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 static const char rcsid[] = 48 "$FreeBSD$"; 49 #endif /* not lint */ 50 51 /* 52 * Lock a terminal up until the given key is entered, until the root 53 * password is entered, or the given 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 <err.h> 64 #include <ctype.h> 65 #include <pwd.h> 66 #include <sgtty.h> 67 #include <stdio.h> 68 #include <stdlib.h> 69 #include <string.h> 70 #include <syslog.h> 71 #include <unistd.h> 72 #include <varargs.h> 73 74 #define TIMEOUT 15 75 76 void quit(), bye(), hi(); 77 static void usage __P((void)); 78 79 struct timeval timeout; 80 struct timeval zerotime; 81 struct sgttyb tty, ntty; 82 long nexttime; /* keep the timeout time */ 83 int no_timeout; /* lock terminal forever */ 84 85 /*ARGSUSED*/ 86 int 87 main(argc, argv) 88 int argc; 89 char **argv; 90 { 91 struct passwd *pw; 92 struct timeval timval; 93 time_t timval_sec; 94 struct itimerval ntimer, otimer; 95 struct tm *timp; 96 int ch, failures, sectimeout, usemine; 97 char *ap, *mypw, *ttynam, *tzn; 98 char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ]; 99 char *crypt(), *ttyname(); 100 101 openlog("lock", LOG_ODELAY, LOG_AUTH); 102 103 sectimeout = TIMEOUT; 104 mypw = NULL; 105 usemine = 0; 106 no_timeout = 0; 107 while ((ch = getopt(argc, argv, "npt:")) != -1) 108 switch((char)ch) { 109 case 't': 110 if ((sectimeout = atoi(optarg)) <= 0) 111 errx(1, "illegal timeout value"); 112 break; 113 case 'p': 114 usemine = 1; 115 if (!(pw = getpwuid(getuid()))) 116 errx(1, "unknown uid %d", getuid()); 117 mypw = strdup(pw->pw_passwd); 118 break; 119 case 'n': 120 no_timeout = 1; 121 break; 122 case '?': 123 default: 124 usage(); 125 } 126 timeout.tv_sec = sectimeout * 60; 127 128 setuid(getuid()); /* discard privs */ 129 130 if (ioctl(0, TIOCGETP, &tty)) /* get information for header */ 131 exit(1); 132 gethostname(hostname, sizeof(hostname)); 133 if (!(ttynam = ttyname(0))) 134 errx(1, "not a terminal?"); 135 if (gettimeofday(&timval, (struct timezone *)NULL)) 136 err(1, "gettimeofday"); 137 nexttime = timval.tv_sec + (sectimeout * 60); 138 timval_sec = timval.tv_sec; 139 timp = localtime(&timval_sec); 140 ap = asctime(timp); 141 tzn = timp->tm_zone; 142 143 (void)signal(SIGINT, quit); 144 (void)signal(SIGQUIT, quit); 145 ntty = tty; ntty.sg_flags &= ~ECHO; 146 (void)ioctl(0, TIOCSETP, &ntty); 147 148 if (!mypw) { 149 /* get key and check again */ 150 (void)printf("Key: "); 151 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 152 quit(); 153 (void)printf("\nAgain: "); 154 /* 155 * Don't need EOF test here, if we get EOF, then s1 != s 156 * and the right things will happen. 157 */ 158 (void)fgets(s1, sizeof(s1), stdin); 159 (void)putchar('\n'); 160 if (strcmp(s1, s)) { 161 (void)printf("\07lock: passwords didn't match.\n"); 162 ioctl(0, TIOCSETP, &tty); 163 exit(1); 164 } 165 s[0] = '\0'; 166 mypw = s1; 167 } 168 169 /* set signal handlers */ 170 (void)signal(SIGINT, hi); 171 (void)signal(SIGQUIT, hi); 172 (void)signal(SIGTSTP, hi); 173 (void)signal(SIGALRM, bye); 174 175 ntimer.it_interval = zerotime; 176 ntimer.it_value = timeout; 177 if (!no_timeout) 178 setitimer(ITIMER_REAL, &ntimer, &otimer); 179 180 /* header info */ 181 if (no_timeout) { 182 (void)printf("lock: %s on %s. no timeout\ntime now is %.20s%s%s", 183 ttynam, hostname, ap, tzn, ap + 19); 184 } else { 185 (void)printf("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s", 186 ttynam, hostname, sectimeout, ap, tzn, ap + 19); 187 } 188 failures = 0; 189 190 for (;;) { 191 (void)printf("Key: "); 192 if (!fgets(s, sizeof(s), stdin)) { 193 clearerr(stdin); 194 hi(); 195 continue; 196 } 197 if (usemine) { 198 s[strlen(s) - 1] = '\0'; 199 if (!strcmp(mypw, crypt(s, mypw))) 200 break; 201 } 202 else if (!strcmp(s, s1)) 203 break; 204 (void)printf("\07\n"); 205 failures++; 206 if (getuid() == 0) 207 syslog(LOG_NOTICE, "%d ROOT UNLOCK FAILURE%s (%s on %s)", 208 failures, failures > 1 ? "S": "", ttynam, hostname); 209 if (ioctl(0, TIOCGETP, &ntty)) 210 exit(1); 211 sleep(1); /* to discourage guessing */ 212 } 213 if (getuid() == 0) 214 syslog(LOG_NOTICE, "ROOT UNLOCK ON hostname %s port %s", 215 hostname, ttynam); 216 quit(); 217 return(0); /* not reached */ 218 } 219 220 221 static void 222 usage() 223 { 224 (void)fprintf(stderr, "usage: lock [-n] [-p] [-t timeout]\n"); 225 exit(1); 226 } 227 228 void 229 hi() 230 { 231 struct timeval timval; 232 233 if (!gettimeofday(&timval, (struct timezone *)NULL)) { 234 (void)printf("lock: type in the unlock key. "); 235 if (no_timeout) { 236 (void)putchar('\n'); 237 } else { 238 (void)printf("timeout in %ld:%ld minutes\n", 239 (nexttime - timval.tv_sec) / 60, 240 (nexttime - timval.tv_sec) % 60); 241 } 242 } 243 } 244 245 void 246 quit() 247 { 248 (void)putchar('\n'); 249 (void)ioctl(0, TIOCSETP, &tty); 250 exit(0); 251 } 252 253 void 254 bye() 255 { 256 if (!no_timeout) { 257 (void)ioctl(0, TIOCSETP, &tty); 258 (void)printf("lock: timeout\n"); 259 exit(1); 260 } 261 } 262