2 * Copyright (c) 1980, 1987, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
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36 * @(#) Copyright (c) 1980, 1987, 1993 The Regents of the University of California. All rights reserved.
37 * @(#)lock.c 8.1 (Berkeley) 6/6/93
38 * $FreeBSD: src/usr.bin/lock/lock.c,v 1.8.2.1 2002/09/15 22:32:56 dd Exp $
42 * Lock a terminal up until the given key is entered or the given
45 * Timeout interval is by default TIMEOUT, it can be changed with
46 * an argument of the form -time where time is in minutes
49 #include <sys/param.h>
51 #include <sys/consio.h>
67 static void quit(int);
70 static void usage(void);
72 static struct timeval timeout;
73 static struct timeval zerotime;
74 static struct termios tty, ntty;
75 static long nexttime; /* keep the timeout time */
76 static int no_timeout; /* lock terminal forever */
77 static int vtyunlock; /* Unlock flag and code. */
81 main(int argc, char **argv)
85 struct itimerval ntimer, otimer;
87 int ch, failures, sectimeout, usemine, vtylock;
89 char *ap, *ep, *mypw, *cryptpw, *ttynam, *tzn;
90 char hostname[MAXHOSTNAMELEN + 1], s[BUFSIZ], s1[BUFSIZ];
92 openlog("lock", LOG_ODELAY, LOG_AUTH);
100 while ((ch = getopt(argc, argv, "npt:v")) != -1)
103 tmp = strtol(optarg, &ep, 10);
104 if (*ep != '\0' || tmp > INT_MAX || tmp < INT_MIN)
105 errx(1, "illegal timeout value");
106 sectimeout = (int)tmp;
110 if (!(pw = getpwuid(getuid())))
111 errx(1, "unknown uid %d", getuid());
112 mypw = strdup(pw->pw_passwd);
124 timeout.tv_sec = sectimeout * 60;
126 if (setuid(getuid()) != 0) /* discard privs */
127 errx(1, "setuid failed");
129 if (tcgetattr(STDIN_FILENO, &tty)) /* get information for header */
130 err(1, "tcgetattr failed");
132 gethostname(hostname, sizeof(hostname));
133 if (!(ttynam = ttyname(STDIN_FILENO)))
134 errx(1, "not a terminal?");
136 nexttime = timval + (sectimeout * 60);
137 timp = localtime(&timval);
141 signal(SIGINT, quit);
142 signal(SIGQUIT, quit);
143 ntty = tty; ntty.c_lflag &= ~ECHO;
144 tcsetattr(STDIN_FILENO, TCSADRAIN|TCSASOFT, &ntty);
147 /* get key and check again */
149 if (!fgets(s, sizeof(s), stdin) || *s == '\n')
153 * Don't need EOF test here, if we get EOF, then s1 != s
154 * and the right things will happen.
156 fgets(s1, sizeof(s1), stdin);
159 printf("\07lock: passwords didn't match.\n");
160 tcsetattr(STDIN_FILENO, TCSADRAIN|TCSASOFT, &tty);
167 /* set signal handlers */
171 signal(SIGALRM, bye);
173 ntimer.it_interval = zerotime;
174 ntimer.it_value = timeout;
176 setitimer(ITIMER_REAL, &ntimer, &otimer);
179 * If this failed, we want to err out; warn isn't good
180 * enough, since we don't want the user to think that
181 * everything is nice and locked because they got a
184 if (ioctl(STDIN_FILENO, VT_LOCKSWITCH, &vtylock) == -1) {
185 tcsetattr(0, TCSADRAIN|TCSASOFT, &tty);
186 err(1, "locking vty");
193 printf("lock: %s using %s on %s.", pw->pw_name,
196 printf("lock: %s on %s.", ttynam, hostname);
198 printf(" no timeout.");
200 printf(" timeout in %d minute%s.", sectimeout,
201 sectimeout != 1 ? "s" : "");
203 printf(" vty locked.");
204 printf("\ntime now is %.20s%s%s", ap, tzn, ap + 19);
210 if (!fgets(s, sizeof(s), stdin)) {
216 s[strlen(s) - 1] = '\0';
217 cryptpw = crypt(s, mypw);
218 if (cryptpw == NULL || !strcmp(mypw, cryptpw))
221 else if (!strcmp(s, s1))
226 syslog(LOG_NOTICE, "%d ROOT UNLOCK FAILURE%s (%s on %s)",
227 failures, failures > 1 ? "S": "", ttynam, hostname);
229 if (tcgetattr(0, &ntty) && (errno != EINTR))
231 sleep(1); /* to discourage guessing */
234 syslog(LOG_NOTICE, "ROOT UNLOCK ON hostname %s port %s",
237 return(0); /* not reached */
244 fprintf(stderr, "usage: lock [-npv] [-t timeout]\n");
249 hi(int signo __unused)
253 if ((timval = time(NULL)) != (time_t)-1) {
254 printf("lock: type in the unlock key. ");
258 printf("timeout in %jd:%jd minutes\n",
259 (intmax_t)(nexttime - timval) / 60,
260 (intmax_t)(nexttime - timval) % 60);
266 quit(int signo __unused)
269 tcsetattr(STDIN_FILENO, TCSADRAIN|TCSASOFT, &tty);
271 ioctl(STDIN_FILENO, VT_LOCKSWITCH, &vtyunlock);
276 bye(int signo __unused)
279 tcsetattr(STDIN_FILENO, TCSADRAIN|TCSASOFT, &tty);
281 ioctl(STDIN_FILENO, VT_LOCKSWITCH, &vtyunlock);
282 printf("lock: timeout\n");