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/* $OpenBSD: login_reject.c,v 1.17 2018/04/26 12:42:51 guenther Exp $ */
/*-
* Copyright (c) 1995 Berkeley Software Design, Inc. All rights reserved.
*
* 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 Berkeley Software Design,
* Inc.
* 4. The name of Berkeley Software Design, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN, INC. ``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 BERKELEY SOFTWARE DESIGN, INC. 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.
*
* BSDI $From: login_reject.c,v 1.5 1996/08/22 20:43:11 prb Exp $
*/
#include <sys/resource.h>
#include <login_cap.h>
#include <readpassphrase.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
int
main(int argc, char *argv[])
{
struct rlimit rl;
FILE *back;
char passbuf[1];
int mode = 0, c;
rl.rlim_cur = 0;
rl.rlim_max = 0;
(void)setrlimit(RLIMIT_CORE, &rl);
(void)setpriority(PRIO_PROCESS, 0, 0);
if (pledge("stdio rpath tty", NULL) == -1) {
syslog(LOG_AUTH|LOG_ERR, "pledge: %m");
exit(1);
}
openlog("login", LOG_ODELAY, LOG_AUTH);
while ((c = getopt(argc, argv, "v:s:")) != -1)
switch (c) {
case 'v':
break;
case 's': /* service */
if (strcmp(optarg, "login") == 0)
mode = 0;
else if (strcmp(optarg, "challenge") == 0)
mode = 1;
else if (strcmp(optarg, "response") == 0)
mode = 2;
else {
syslog(LOG_ERR, "%s: invalid service", optarg);
exit(1);
}
break;
default:
syslog(LOG_ERR, "usage error");
exit(1);
}
switch (argc - optind) {
case 2:
case 1:
break;
default:
syslog(LOG_ERR, "usage error");
exit(1);
}
if (!(back = fdopen(3, "r+"))) {
syslog(LOG_ERR, "reopening back channel: %m");
exit(1);
}
if (mode == 1) {
fprintf(back, BI_SILENT "\n");
exit(0);
}
if (mode == 2) {
mode = 0;
c = -1;
while (read(3, passbuf, 1) == 1) {
if (passbuf[0] == '\0' && ++mode == 2)
break;
}
if (mode < 2) {
syslog(LOG_ERR, "protocol error on back channel");
exit(1);
}
} else
readpassphrase("Password:", passbuf, sizeof(passbuf), 0);
crypt_checkpass("password", NULL);
fprintf(back, BI_REJECT "\n");
exit(1);
}
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