174 lines
4.8 KiB
C
174 lines
4.8 KiB
C
/* $OpenBSD: login_passwd.c,v 1.20 2021/11/16 21:55:21 deraadt 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_passwd.c,v 1.11 1997/08/08 18:58:24 prb Exp $
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/resource.h>
|
|
|
|
#include <errno.h>
|
|
#include <pwd.h>
|
|
#include <readpassphrase.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <syslog.h>
|
|
#include <unistd.h>
|
|
#include <util.h>
|
|
|
|
#include <login_cap.h>
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
FILE *back = NULL;
|
|
char *class = NULL, *username = NULL, *wheel = NULL;
|
|
char response[1024], pbuf[1024], *pass = "";
|
|
int ch, rc, mode = 0, lastchance = 0;
|
|
struct passwd *pwd;
|
|
|
|
(void)signal(SIGQUIT, SIG_IGN);
|
|
(void)signal(SIGINT, SIG_IGN);
|
|
(void)setpriority(PRIO_PROCESS, 0, 0);
|
|
|
|
openlog(NULL, LOG_ODELAY, LOG_AUTH);
|
|
|
|
while ((ch = getopt(argc, argv, "ds:v:")) != -1) {
|
|
switch (ch) {
|
|
case 'd':
|
|
back = stdout;
|
|
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;
|
|
case 'v':
|
|
if (strncmp(optarg, "wheel=", 6) == 0)
|
|
wheel = optarg + 6;
|
|
else if (strncmp(optarg, "lastchance=", 11) == 0)
|
|
lastchance = (strcmp(optarg + 11, "yes") == 0);
|
|
break;
|
|
default:
|
|
syslog(LOG_ERR, "usage error");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
switch (argc - optind) {
|
|
case 2:
|
|
class = argv[optind + 1];
|
|
/* FALLTHROUGH */
|
|
case 1:
|
|
username = argv[optind];
|
|
break;
|
|
default:
|
|
syslog(LOG_ERR, "usage error");
|
|
exit(1);
|
|
}
|
|
|
|
/* get the password hash before pledge(2) or it will return '*' */
|
|
pwd = getpwnam_shadow(username);
|
|
|
|
if (pledge("stdio rpath tty id", NULL) == -1) {
|
|
syslog(LOG_ERR, "pledge: %m");
|
|
exit(1);
|
|
}
|
|
|
|
if (back == NULL && (back = fdopen(3, "r+")) == NULL) {
|
|
syslog(LOG_ERR, "reopening back channel: %m");
|
|
exit(1);
|
|
}
|
|
if (wheel != NULL && strcmp(wheel, "yes") != 0) {
|
|
fprintf(back, BI_VALUE " errormsg %s\n",
|
|
"you are not in group wheel");
|
|
goto reject;
|
|
}
|
|
|
|
if (mode == 1) {
|
|
fprintf(back, BI_SILENT "\n");
|
|
exit(0);
|
|
}
|
|
|
|
(void)setpriority(PRIO_PROCESS, 0, -4);
|
|
|
|
if (mode == 2) {
|
|
mode = 0;
|
|
ch = -1;
|
|
while (++ch < sizeof(response) &&
|
|
read(3, &response[ch], 1) == 1) {
|
|
if (response[ch] == '\0' && ++mode == 2)
|
|
break;
|
|
if (response[ch] == '\0' && mode == 1)
|
|
pass = response + ch + 1;
|
|
}
|
|
if (mode < 2) {
|
|
syslog(LOG_ERR, "protocol error on back channel");
|
|
exit(1);
|
|
}
|
|
} else {
|
|
if (pwd == NULL || *pwd->pw_passwd != '\0') {
|
|
pass = readpassphrase("Password:", pbuf, sizeof(pbuf),
|
|
RPP_ECHO_OFF);
|
|
if (pass == NULL)
|
|
goto reject;
|
|
}
|
|
}
|
|
|
|
if (pledge("stdio rpath", NULL) == -1) {
|
|
syslog(LOG_ERR, "pledge: %m");
|
|
exit(1);
|
|
}
|
|
|
|
rc = crypt_checkpass(pass, pwd ? pwd->pw_passwd : NULL);
|
|
explicit_bzero(pass, strlen(pass));
|
|
if (rc == 0) {
|
|
if (login_check_expire(back, pwd, class, lastchance) == 0) {
|
|
fprintf(back, BI_AUTH "\n");
|
|
exit(0);
|
|
}
|
|
}
|
|
reject:
|
|
fprintf(back, BI_REJECT "\n");
|
|
exit(1);
|
|
}
|