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/* $OpenBSD: lock.c,v 1.29 2015/10/07 04:05:24 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. 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.
*/
/*
* 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/stat.h>
#include <sys/time.h>
#include <signal.h>
#include <ctype.h>
#include <err.h>
#include <pwd.h>
#include <readpassphrase.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <limits.h>
#include <login_cap.h>
#include <bsd_auth.h>
#define TIMEOUT 15
void bye(int);
void hi(int);
struct timeval timeout;
struct timeval zerotime;
time_t nexttime; /* keep the timeout time */
int no_timeout; /* lock terminal forever */
extern char *__progname;
/*ARGSUSED*/
int
main(int argc, char *argv[])
{
char hostname[HOST_NAME_MAX+1], s[BUFSIZ], s1[BUFSIZ], date[256];
char *p, *style, *nstyle, *ttynam;
struct itimerval ntimer, otimer;
int ch, sectimeout, usemine, cnt, tries = 10, backoff = 3;
const char *errstr;
struct passwd *pw;
struct tm *timp;
time_t curtime;
login_cap_t *lc;
sectimeout = TIMEOUT;
style = NULL;
usemine = 0;
no_timeout = 0;
if (tame("stdio getpw rpath wpath tty", NULL) == -1)
err(1, "tame");
if (!(pw = getpwuid(getuid())))
errx(1, "unknown uid %u.", getuid());
lc = login_getclass(pw->pw_class);
if (lc != NULL) {
/*
* We allow "login-tries" attempts to login but start
* slowing down after "login-backoff" attempts.
*/
tries = (int)login_getcapnum(lc, "login-tries", 10, 10);
backoff = (int)login_getcapnum(lc, "login-backoff", 3, 3);
}
while ((ch = getopt(argc, argv, "a:npt:")) != -1)
switch (ch) {
case 'a':
if (lc) {
style = login_getstyle(lc, optarg, "auth-lock");
if (style == NULL)
errx(1,
"invalid authentication style: %s",
optarg);
}
usemine = 1;
break;
case 't':
sectimeout = (int)strtonum(optarg, 1, INT_MAX, &errstr);
if (errstr)
errx(1, "timeout %s: %s", errstr, optarg);
break;
case 'p':
usemine = 1;
break;
case 'n':
no_timeout = 1;
break;
default:
(void)fprintf(stderr,
"usage: %s [-np] [-a style] [-t timeout]\n",
__progname);
exit(1);
}
timeout.tv_sec = sectimeout * 60;
gethostname(hostname, sizeof(hostname));
if (usemine && lc == NULL)
errx(1, "login class not found");
if (!(ttynam = ttyname(STDIN_FILENO)))
errx(1, "not a terminal?");
curtime = time(NULL);
nexttime = curtime + (sectimeout * 60);
timp = localtime(&curtime);
strftime(date, sizeof(date), "%c", timp);
if (!usemine) {
/* get key and check again */
if (!readpassphrase("Key: ", s, sizeof(s), RPP_ECHO_OFF) ||
*s == '\0')
exit(0);
/*
* Don't need EOF test here, if we get EOF, then s1 != s
* and the right things will happen.
*/
(void)readpassphrase("Again: ", s1, sizeof(s1), RPP_ECHO_OFF);
if (strcmp(s1, s)) {
warnx("\apasswords didn't match.");
exit(1);
}
s[0] = '\0';
}
/* 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)fprintf(stderr,
"%s: %s on %s. no timeout\ntime now is %s\n",
__progname, ttynam, hostname, date);
} else {
(void)fprintf(stderr,
"%s: %s on %s. timeout in %d minutes\ntime now is %s\n",
__progname, ttynam, hostname, sectimeout, date);
}
for (cnt = 0;;) {
if (!readpassphrase("Key: ", s, sizeof(s), RPP_ECHO_OFF) ||
*s == '\0') {
hi(0);
continue;
}
if (usemine) {
/*
* If user entered 's/key' or the style specified via
* the '-a' argument, auth_userokay() will prompt
* for a new password. Otherwise, use what we have.
*/
if ((strcmp(s, "s/key") == 0 &&
(nstyle = login_getstyle(lc, "skey", "auth-lock")))
|| ((nstyle = style) && strcmp(s, nstyle) == 0))
p = NULL;
else
p = s;
if (auth_userokay(pw->pw_name, nstyle, "auth-lock", p))
break;
} else if (strcmp(s, s1) == 0)
break;
(void)putc('\a', stderr);
cnt %= tries;
if (++cnt > backoff) {
sigset_t set, oset;
sigfillset(&set);
sigprocmask(SIG_BLOCK, &set, &oset);
sleep((u_int)((cnt - backoff) * tries / 2));
sigprocmask(SIG_SETMASK, &oset, NULL);
}
}
exit(0);
}
/*ARGSUSED*/
void
hi(int signo)
{
char buf[1024], buf2[1024];
time_t left;
if (no_timeout)
buf2[0] = '\0';
else {
left = nexttime - time(NULL);
(void)snprintf(buf2, sizeof buf2, " timeout in %lld:%d minutes",
(long long)(left / 60), (int)(left % 60));
}
(void)snprintf(buf, sizeof buf, "%s: type in the unlock key.%s\n",
__progname, buf2);
(void) write(STDERR_FILENO, buf, strlen(buf));
}
/*ARGSUSED*/
void
bye(int signo)
{
if (!no_timeout)
warnx("timeout");
_exit(1);
}
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