244 lines
6.6 KiB
C
244 lines
6.6 KiB
C
/*
|
|
* Copyright (c) 1980, 1987, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Bob Toxen.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char copyright[] =
|
|
"@(#) Copyright (c) 1980, 1987, 1993\n\
|
|
The Regents of the University of California. All rights reserved.\n";
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)lock.c 8.1 (Berkeley) 6/6/93";
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* Lock a terminal up until the given key is entered, until the root
|
|
* password is entered, or the given interval times out.
|
|
*
|
|
* Timeout interval is by default TIMEOUT, it can be changed with
|
|
* an argument of the form -time where time is in minutes
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/time.h>
|
|
#include <sys/signal.h>
|
|
#include <sgtty.h>
|
|
#include <pwd.h>
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
#include <string.h>
|
|
|
|
#define TIMEOUT 15
|
|
|
|
void quit(), bye(), hi();
|
|
|
|
struct timeval timeout;
|
|
struct timeval zerotime;
|
|
struct sgttyb tty, ntty;
|
|
long nexttime; /* keep the timeout time */
|
|
int no_timeout; /* lock terminal forever */
|
|
|
|
/*ARGSUSED*/
|
|
main(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
extern char *optarg;
|
|
extern int errno, optind;
|
|
struct passwd *pw;
|
|
struct timeval timval;
|
|
struct itimerval ntimer, otimer;
|
|
struct tm *timp;
|
|
int ch, sectimeout, usemine;
|
|
char *ap, *mypw, *ttynam, *tzn;
|
|
char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ];
|
|
char *crypt(), *ttyname();
|
|
|
|
sectimeout = TIMEOUT;
|
|
mypw = NULL;
|
|
usemine = 0;
|
|
no_timeout = 0;
|
|
while ((ch = getopt(argc, argv, "npt:")) != -1)
|
|
switch((char)ch) {
|
|
case 't':
|
|
if ((sectimeout = atoi(optarg)) <= 0) {
|
|
(void)fprintf(stderr,
|
|
"lock: illegal timeout value.\n");
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'p':
|
|
usemine = 1;
|
|
if (!(pw = getpwuid(getuid()))) {
|
|
(void)fprintf(stderr,
|
|
"lock: unknown uid %d.\n", getuid());
|
|
exit(1);
|
|
}
|
|
mypw = strdup(pw->pw_passwd);
|
|
break;
|
|
case 'n':
|
|
no_timeout = 1;
|
|
break;
|
|
case '?':
|
|
default:
|
|
(void)fprintf(stderr,
|
|
"usage: lock [-n] [-p] [-t timeout]\n");
|
|
exit(1);
|
|
}
|
|
timeout.tv_sec = sectimeout * 60;
|
|
|
|
setuid(getuid()); /* discard privs */
|
|
|
|
if (ioctl(0, TIOCGETP, &tty)) /* get information for header */
|
|
exit(1);
|
|
gethostname(hostname, sizeof(hostname));
|
|
if (!(ttynam = ttyname(0))) {
|
|
(void)printf("lock: not a terminal?\n");
|
|
exit(1);
|
|
}
|
|
if (gettimeofday(&timval, (struct timezone *)NULL)) {
|
|
(void)fprintf(stderr,
|
|
"lock: gettimeofday: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
nexttime = timval.tv_sec + (sectimeout * 60);
|
|
timp = localtime(&timval.tv_sec);
|
|
ap = asctime(timp);
|
|
tzn = timp->tm_zone;
|
|
|
|
(void)signal(SIGINT, quit);
|
|
(void)signal(SIGQUIT, quit);
|
|
ntty = tty; ntty.sg_flags &= ~ECHO;
|
|
(void)ioctl(0, TIOCSETP, &ntty);
|
|
|
|
if (!mypw) {
|
|
/* get key and check again */
|
|
(void)printf("Key: ");
|
|
if (!fgets(s, sizeof(s), stdin) || *s == '\n')
|
|
quit();
|
|
(void)printf("\nAgain: ");
|
|
/*
|
|
* Don't need EOF test here, if we get EOF, then s1 != s
|
|
* and the right things will happen.
|
|
*/
|
|
(void)fgets(s1, sizeof(s1), stdin);
|
|
(void)putchar('\n');
|
|
if (strcmp(s1, s)) {
|
|
(void)printf("\07lock: passwords didn't match.\n");
|
|
ioctl(0, TIOCSETP, &tty);
|
|
exit(1);
|
|
}
|
|
s[0] = NULL;
|
|
mypw = s1;
|
|
}
|
|
|
|
/* set signal handlers */
|
|
(void)signal(SIGINT, hi);
|
|
(void)signal(SIGQUIT, hi);
|
|
(void)signal(SIGTSTP, hi);
|
|
(void)signal(SIGALRM, bye);
|
|
|
|
ntimer.it_interval = zerotime;
|
|
ntimer.it_value = timeout;
|
|
if (!no_timeout)
|
|
setitimer(ITIMER_REAL, &ntimer, &otimer);
|
|
|
|
/* header info */
|
|
if (no_timeout) {
|
|
(void)printf("lock: %s on %s. no timeout\ntime now is %.20s%s%s",
|
|
ttynam, hostname, ap, tzn, ap + 19);
|
|
} else {
|
|
(void)printf("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s",
|
|
ttynam, hostname, sectimeout, ap, tzn, ap + 19);
|
|
}
|
|
|
|
for (;;) {
|
|
(void)printf("Key: ");
|
|
if (!fgets(s, sizeof(s), stdin)) {
|
|
clearerr(stdin);
|
|
hi();
|
|
continue;
|
|
}
|
|
if (usemine) {
|
|
s[strlen(s) - 1] = '\0';
|
|
if (!strcmp(mypw, crypt(s, mypw)))
|
|
break;
|
|
}
|
|
else if (!strcmp(s, s1))
|
|
break;
|
|
(void)printf("\07\n");
|
|
if (ioctl(0, TIOCGETP, &ntty))
|
|
exit(1);
|
|
}
|
|
quit();
|
|
}
|
|
|
|
void
|
|
hi()
|
|
{
|
|
struct timeval timval;
|
|
|
|
if (!gettimeofday(&timval, (struct timezone *)NULL)) {
|
|
(void)printf("lock: type in the unlock key. ");
|
|
if (no_timeout) {
|
|
(void)putchar('\n');
|
|
} else {
|
|
(void)printf("timeout in %ld:%ld minutes\n",
|
|
(nexttime - timval.tv_sec) / 60,
|
|
(nexttime - timval.tv_sec) % 60);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
quit()
|
|
{
|
|
(void)putchar('\n');
|
|
(void)ioctl(0, TIOCSETP, &tty);
|
|
exit(0);
|
|
}
|
|
|
|
void
|
|
bye()
|
|
{
|
|
if (!no_timeout) {
|
|
(void)ioctl(0, TIOCSETP, &tty);
|
|
(void)printf("lock: timeout\n");
|
|
exit(1);
|
|
}
|
|
}
|