checkpasswd.c

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    1 /*      $NetBSD: checkpasswd.c,v 1.5 2003/04/15 22:26:42 dsl Exp $      */
    2 
    3 /*-
    4  * Copyright (c) 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  *      @(#)gets.c      8.1 (Berkeley) 6/11/93
   29  */
   30 
   31 #ifdef _STANDALONE
   32 #include <lib/libkern/libkern.h>
   33 #else
   34 #include <string.h>
   35 #endif
   36 
   37 #include "stand.h"
   38 
   39 char *
   40 getpass(prompt)
   41         const char *prompt;
   42 {
   43         int c;
   44         char *lp;
   45         static char buf[128]; /* == _PASSWORD_LEN */
   46 
   47         printf(prompt);
   48 
   49         for (lp = buf;;)
   50                 switch (c = getchar() & 0177) {
   51                 case '\n':
   52                 case '\r':
   53                         *lp = '\0';
   54                         putchar('\n');
   55                         return (buf);
   56                 case '\b':
   57                 case '\177':
   58                         if (lp > buf) {
   59                                 lp--;
   60                                 putchar('\b');
   61                                 putchar(' ');
   62                                 putchar('\b');
   63                         }
   64                         break;
   65 #if HASH_ERASE
   66                 case '#':
   67                         if (lp > buf)
   68                                 --lp;
   69                         break;
   70 #endif
   71                 case 'r'&037: {
   72                         char *p;
   73 
   74                         putchar('\n');
   75                         for (p = buf; p < lp; ++p)
   76                                 putchar('*');
   77                         break;
   78                 }
   79 #if AT_ERASE
   80                 case '@':
   81 #endif
   82                 case 'u'&037:
   83                 case 'w'&037:
   84                         lp = buf;
   85                         putchar('\n');
   86                         break;
   87                 default:
   88                         *lp++ = c;
   89                         putchar('*');
   90                 }
   91         /*NOTREACHED*/
   92 }
   93 
   94 #include <sys/md5.h>
   95 
   96 char bootpasswd[16] = {'\0'}; /* into data segment! */
   97 
   98 int
   99 checkpasswd(void)
  100 {
  101         return check_password(bootpasswd);
  102 }
  103 
  104 int
  105 check_password(const char *password)
  106 {
  107         int i;
  108         char *passwd;
  109         MD5_CTX md5ctx;
  110         char pwdigest[16];
  111 
  112         for (i = 0; i < 16; i++)
  113                 if (password[i])
  114                         break;
  115         if (i == 16)
  116                 return (1); /* no password set */
  117 
  118         for (i = 0; i < 3; i++) {
  119                 passwd = getpass("Password: ");
  120                 MD5Init(&md5ctx);
  121                 MD5Update(&md5ctx, passwd, strlen(passwd));
  122                 MD5Final(pwdigest, &md5ctx);
  123                 if (bcmp(pwdigest, password, 16) == 0)
  124                         return (1);
  125         }
  126 
  127         /* failed */
  128         return (0);
  129 }
  130

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FreeBSD/Linux Kernel Cross Reference sys/lib/libsa/checkpasswd.c

FreeBSD/Linux Kernel Cross Reference
sys/lib/libsa/checkpasswd.c