/*      $NetBSD: checkpasswd.c,v 1.11 2019/03/31 20:08:45 christos Exp $        */

/*-
 * Copyright (c) 1993
 *      The Regents of the University of California.  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.
 *
 * 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.
 *
 *      @(#)gets.c      8.1 (Berkeley) 6/11/93
 */

#ifdef _STANDALONE
#include <lib/libkern/libkern.h>
#else
#include <string.h>
#endif

#include "stand.h"

char *
getpass(const char *prompt)
{
        int c;
        char *lp;
        static char buf[128]; /* == _PASSWORD_LEN */

        printf("%s", prompt);

        for (lp = buf;;) {
                switch (c = getchar() & 0177) {
                case '\n':
                case '\r':
                        *lp = '\0';
                        putchar('\n');
                        return buf;
                case '\b':
                case '\177':
                        if (lp > buf) {
                                lp--;
                                putchar('\b');
                                putchar(' ');
                                putchar('\b');
                        }
                        break;
#if HASH_ERASE
                case '#':
                        if (lp > buf)
                                --lp;
                        break;
#endif
                case 'r'&037: {
                        char *p;

                        putchar('\n');
                        for (p = buf; p < lp; ++p)
                                putchar('*');
                        break;
                }
#if AT_ERASE
                case '@':
#endif
                case 'u'&037:
                case 'w'&037:
                        lp = buf;
                        putchar('\n');
                        break;
                default:
                        if ((size_t)(lp - buf) < sizeof(buf) - 1) {
                                *lp++ = (char)c;
                                putchar('*');
                        }
                        break;
                }
        }
        /*NOTREACHED*/
}

#include <sys/md5.h>

char bootpasswd[16] = {'\0'}; /* into data segment! */

int
checkpasswd(void)
{

        return check_password(bootpasswd);
}

int
check_password(const char *password)
{
        int i;
        char *passwd;
        MD5_CTX md5ctx;
        char pwdigest[16];

        for (i = 0; i < 16; i++)
                if (password[i])
                        break;
        if (i == 16)
                return 1; /* no password set */

        for (i = 0; i < 3; i++) {
                passwd = getpass("Password: ");
                MD5Init(&md5ctx);
                MD5Update(&md5ctx, passwd, (u_int)strlen(passwd));
                MD5Final(pwdigest, &md5ctx);
                if (memcmp(pwdigest, password, 16) == 0)
                        return 1;
        }

        /* failed */
        return 0;
}