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/* $OpenBSD: lock.c,v 1.5 1996/08/06 18:10:23 deraadt Exp $ */
/* $NetBSD: lock.c,v 1.8 1996/05/07 18:32:31 jtc Exp $ */
/*
* 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
#if 0
static char sccsid[] = "@(#)lock.c 8.1 (Berkeley) 6/6/93";
#endif
static char rcsid[] = "$OpenBSD: lock.c,v 1.5 1996/08/06 18:10:23 deraadt Exp $";
#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 <signal.h>
#include <ctype.h>
#include <err.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#define TIMEOUT 15
void quit(), bye(), hi();
struct timeval timeout;
struct timeval zerotime;
struct termios tty, ntty;
long nexttime; /* keep the timeout time */
/*ARGSUSED*/
main(argc, argv)
int argc;
char **argv;
{
extern char *optarg;
struct passwd *pw;
struct timeval timval;
struct itimerval ntimer, otimer;
struct tm *timp;
time_t curtime;
int ch, sectimeout, usemine;
char *ap, *mypw, *ttynam, *tzn;
char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ];
char *crypt();
sectimeout = TIMEOUT;
mypw = NULL;
usemine = 0;
if (!(pw = getpwuid(getuid())))
errx(1, "unknown uid %d.", getuid());
while ((ch = getopt(argc, argv, "pt:")) != EOF)
switch((char)ch) {
case 't':
if ((sectimeout = atoi(optarg)) <= 0)
errx(1, "illegal timeout value: %s", optarg);
break;
case 'p':
usemine = 1;
mypw = strdup(pw->pw_passwd);
break;
case '?':
default:
fprintf(stderr, "usage: lock [-p] [-t timeout]\n");
exit(1);
}
timeout.tv_sec = sectimeout * 60;
setuid(getuid()); /* discard privs */
if (tcgetattr(0, &tty) < 0) /* get information for header */
exit(1);
gethostname(hostname, sizeof(hostname));
if (!(ttynam = ttyname(0)))
errx(1, "not a terminal?");
if (gettimeofday(&timval, (struct timezone *)NULL))
err(1, "gettimeofday");
curtime = timval.tv_sec;
nexttime = timval.tv_sec + (sectimeout * 60);
timp = localtime(&curtime);
ap = asctime(timp);
tzn = timp->tm_zone;
(void)signal(SIGINT, quit);
(void)signal(SIGQUIT, quit);
ntty = tty; ntty.c_lflag &= ~ECHO;
(void)tcsetattr(0, TCSADRAIN, &ntty);
if (!mypw) {
/* get key and check again */
printf("Key: ");
if (!fgets(s, sizeof(s), stdin) || *s == '\n')
quit();
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("\alock: passwords didn't match.\n");
(void)tcsetattr(0, TCSADRAIN, &tty);
exit(1);
}
s[0] = '\0';
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;
setitimer(ITIMER_REAL, &ntimer, &otimer);
/* header info */
printf("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s",
ttynam, hostname, sectimeout, ap, tzn, ap + 19);
for (;;) {
printf("Key: ");
if (!fgets(s, sizeof(s), stdin)) {
clearerr(stdin);
hi();
continue;
}
if (usemine) {
s[strlen(s) - 1] = '\0';
#ifdef SKEY
if (strcasecmp(s, "s/key") == 0) {
if (skey_auth(pw->pw_name))
break;
}
#endif
if (!strcmp(mypw, crypt(s, mypw)))
break;
}
else if (!strcmp(s, s1))
break;
printf("\a\n");
if (tcsetattr(0, TCSADRAIN, &ntty) < 0)
exit(1);
}
quit();
}
#ifdef SKEY
/*
* We can't use libskey's skey_authenticate() since it
* handles signals in a way that's inappropriate
* for our needs. Instead we roll our own.
*/
int
skey_auth(user)
char *user;
{
char s[128], *ask, *skey_keyinfo __P((char *name));
int ret = 0;
if (!skey_haskey(user) && (ask = skey_keyinfo(user))) {
printf("\n[%s]\nResponse: ", ask);
if (!fgets(s, sizeof(s), stdin) || *s == '\n')
clearerr(stdin);
else {
s[strlen(s) - 1] = '\0';
if (skey_passcheck(user, s) != -1)
ret = 1;
}
} else
printf("Sorry, you have no s/key.\n");
return ret;
}
#endif
void
hi()
{
struct timeval timval;
if (!gettimeofday(&timval, (struct timezone *)NULL))
printf("lock: type in the unlock key. timeout in %ld:%ld minutes\n",
(nexttime - timval.tv_sec) / 60, (nexttime - timval.tv_sec) % 60);
}
void
quit()
{
putchar('\n');
(void)tcsetattr(0, TCSADRAIN, &tty);
exit(0);
}
void
bye()
{
(void)tcsetattr(0, TCSADRAIN, &tty);
printf("lock: timeout\n");
exit(1);
}
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