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(int); 77 void bye(int); 78 void hi(int); 79 static void usage(void); 80 81 struct timeval timeout; 82 struct timeval zerotime; 83 struct sgttyb tty, ntty; 84 long nexttime; /* keep the timeout time */ 85 int no_timeout; /* lock terminal forever */ 86 87 /*ARGSUSED*/ 88 int 89 main(argc, argv) 90 int argc; 91 char **argv; 92 { 93 struct passwd *pw; 94 struct timeval timval; 95 time_t timval_sec; 96 struct itimerval ntimer, otimer; 97 struct tm *timp; 98 int ch, failures, sectimeout, usemine; 99 char *ap, *mypw, *ttynam, *tzn; 100 char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ]; 101 102 openlog("lock", LOG_ODELAY, LOG_AUTH); 103 104 sectimeout = TIMEOUT; 105 mypw = NULL; 106 usemine = 0; 107 no_timeout = 0; 108 while ((ch = getopt(argc, argv, "npt:")) != -1) 109 switch((char)ch) { 110 case 't': 111 if ((sectimeout = atoi(optarg)) <= 0) 112 errx(1, "illegal timeout value"); 113 break; 114 case 'p': 115 usemine = 1; 116 if (!(pw = getpwuid(getuid()))) 117 errx(1, "unknown uid %d", getuid()); 118 mypw = strdup(pw->pw_passwd); 119 break; 120 case 'n': 121 no_timeout = 1; 122 break; 123 case '?': 124 default: 125 usage(); 126 } 127 timeout.tv_sec = sectimeout * 60; 128 129 setuid(getuid()); /* discard privs */ 130 131 if (ioctl(0, TIOCGETP, &tty)) /* get information for header */ 132 exit(1); 133 gethostname(hostname, sizeof(hostname)); 134 if (!(ttynam = ttyname(0))) 135 errx(1, "not a terminal?"); 136 if (gettimeofday(&timval, (struct timezone *)NULL)) 137 err(1, "gettimeofday"); 138 nexttime = timval.tv_sec + (sectimeout * 60); 139 timval_sec = timval.tv_sec; 140 timp = localtime(&timval_sec); 141 ap = asctime(timp); 142 tzn = timp->tm_zone; 143 144 (void)signal(SIGINT, quit); 145 (void)signal(SIGQUIT, quit); 146 ntty = tty; ntty.sg_flags &= ~ECHO; 147 (void)ioctl(0, TIOCSETP, &ntty); 148 149 if (!mypw) { 150 /* get key and check again */ 151 (void)printf("Key: "); 152 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 153 quit(0); 154 (void)printf("\nAgain: "); 155 /* 156 * Don't need EOF test here, if we get EOF, then s1 != s 157 * and the right things will happen. 158 */ 159 (void)fgets(s1, sizeof(s1), stdin); 160 (void)putchar('\n'); 161 if (strcmp(s1, s)) { 162 (void)printf("\07lock: passwords didn't match.\n"); 163 ioctl(0, TIOCSETP, &tty); 164 exit(1); 165 } 166 s[0] = '\0'; 167 mypw = s1; 168 } 169 170 /* set signal handlers */ 171 (void)signal(SIGINT, hi); 172 (void)signal(SIGQUIT, hi); 173 (void)signal(SIGTSTP, hi); 174 (void)signal(SIGALRM, bye); 175 176 ntimer.it_interval = zerotime; 177 ntimer.it_value = timeout; 178 if (!no_timeout) 179 setitimer(ITIMER_REAL, &ntimer, &otimer); 180 181 /* header info */ 182 if (no_timeout) { 183 (void)printf("lock: %s on %s. no timeout\ntime now is %.20s%s%s", 184 ttynam, hostname, ap, tzn, ap + 19); 185 } else { 186 (void)printf("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s", 187 ttynam, hostname, sectimeout, ap, tzn, ap + 19); 188 } 189 failures = 0; 190 191 for (;;) { 192 (void)printf("Key: "); 193 if (!fgets(s, sizeof(s), stdin)) { 194 clearerr(stdin); 195 hi(0); 196 continue; 197 } 198 if (usemine) { 199 s[strlen(s) - 1] = '\0'; 200 if (!strcmp(mypw, crypt(s, mypw))) 201 break; 202 } 203 else if (!strcmp(s, s1)) 204 break; 205 (void)printf("\07\n"); 206 failures++; 207 if (getuid() == 0) 208 syslog(LOG_NOTICE, "%d ROOT UNLOCK FAILURE%s (%s on %s)", 209 failures, failures > 1 ? "S": "", ttynam, hostname); 210 if (ioctl(0, TIOCGETP, &ntty)) 211 exit(1); 212 sleep(1); /* to discourage guessing */ 213 } 214 if (getuid() == 0) 215 syslog(LOG_NOTICE, "ROOT UNLOCK ON hostname %s port %s", 216 hostname, ttynam); 217 quit(0); 218 return(0); /* not reached */ 219 } 220 221 222 static void 223 usage() 224 { 225 (void)fprintf(stderr, "usage: lock [-n] [-p] [-t timeout]\n"); 226 exit(1); 227 } 228 229 void 230 hi(int signo __unused) 231 { 232 struct timeval timval; 233 234 if (!gettimeofday(&timval, (struct timezone *)NULL)) { 235 (void)printf("lock: type in the unlock key. "); 236 if (no_timeout) { 237 (void)putchar('\n'); 238 } else { 239 (void)printf("timeout in %ld:%ld minutes\n", 240 (nexttime - timval.tv_sec) / 60, 241 (nexttime - timval.tv_sec) % 60); 242 } 243 } 244 } 245 246 void 247 quit(int signo __unused) 248 { 249 (void)putchar('\n'); 250 (void)ioctl(0, TIOCSETP, &tty); 251 exit(0); 252 } 253 254 void 255 bye(int signo __unused) 256 { 257 if (!no_timeout) { 258 (void)ioctl(0, TIOCSETP, &tty); 259 (void)printf("lock: timeout\n"); 260 exit(1); 261 } 262 } 263