138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/* $OpenBSD: login_lchpass.c,v 1.21 2018/04/26 12:42:51 guenther Exp $ */
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/*-
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* Copyright (c) 1995,1996 Berkeley Software Design, Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Berkeley Software Design,
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* Inc.
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* 4. The name of Berkeley Software Design, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN, INC. BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* BSDI $From: login_lchpass.c,v 1.4 1997/08/08 18:58:23 prb Exp $
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*/
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#include <sys/resource.h>
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#include <sys/uio.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <login_cap.h>
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#include <readpassphrase.h>
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#define BACK_CHANNEL 3
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int local_passwd(char *, int);
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int
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main(int argc, char *argv[])
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{
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struct iovec iov[2];
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struct passwd *pwd;
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char *username = NULL, *hash = NULL;
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char oldpass[1024];
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struct rlimit rl;
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int c;
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iov[0].iov_base = BI_SILENT;
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iov[0].iov_len = sizeof(BI_SILENT) - 1;
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iov[1].iov_base = "\n";
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iov[1].iov_len = 1;
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rl.rlim_cur = 0;
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rl.rlim_max = 0;
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(void)setrlimit(RLIMIT_CORE, &rl);
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(void)setpriority(PRIO_PROCESS, 0, 0);
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openlog("login", LOG_ODELAY, LOG_AUTH);
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while ((c = getopt(argc, argv, "v:s:")) != -1)
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switch (c) {
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case 'v':
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break;
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case 's': /* service */
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if (strcmp(optarg, "login") != 0) {
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syslog(LOG_ERR, "%s: invalid service", optarg);
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exit(1);
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}
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break;
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default:
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syslog(LOG_ERR, "usage error");
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exit(1);
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}
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switch (argc - optind) {
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case 2:
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/* class is not used */
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case 1:
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username = argv[optind];
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break;
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default:
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syslog(LOG_ERR, "usage error");
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exit(1);
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}
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pwd = getpwnam_shadow(username);
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if (pwd) {
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if (pwd->pw_uid == 0) {
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syslog(LOG_ERR, "attempted root password change");
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pwd = NULL;
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} else if (*pwd->pw_passwd == '\0') {
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syslog(LOG_ERR, "%s attempting to add password",
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username);
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pwd = NULL;
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}
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}
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if (pwd)
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hash = pwd->pw_passwd;
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(void)setpriority(PRIO_PROCESS, 0, -4);
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(void)printf("Changing local password for %s.\n", username);
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if ((readpassphrase("Old Password:", oldpass, sizeof(oldpass),
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RPP_ECHO_OFF)) == NULL)
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exit(1);
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if (crypt_checkpass(oldpass, hash) != 0) {
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explicit_bzero(oldpass, strlen(oldpass));
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exit(1);
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}
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explicit_bzero(oldpass, strlen(oldpass));
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/*
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* We rely on local_passwd() to block signals during the
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* critical section.
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*/
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local_passwd(pwd->pw_name, 1);
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(void)writev(BACK_CHANNEL, iov, 2);
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exit(0);
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}
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