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/* $OpenBSD: login_lchpass.c,v 1.20 2016/09/03 10:48:15 gsoares 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/stat.h> |
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#include <sys/time.h> |
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#include <sys/resource.h> |
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#include <sys/file.h> |
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#include <sys/uio.h> |
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#include <sys/wait.h> |
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#include <err.h> |
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#include <errno.h> |
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#include <pwd.h> |
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#include <signal.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 <stdarg.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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} |