5f521d7ba7
glibc has a pretty nice function called crypt_r(3), which is nothing more than crypt(3), but thread-safe. It accomplishes this by introducing a 'struct crypt_data' structure that contains a buffer that is large enough to hold the resulting string. Let's go ahead and also add this function. It would be a shame if a useful function like this wouldn't be usable in multithreaded apps. Refactor crypt.c and all of the backends to no longer declare static arrays, but write their output in a provided buffer. There is no need to do any buffer length computation here, as we'll just need to ensure that 'struct crypt_data' is large enough, which it is. _PASSWORD_LEN is defined to 128 bytes, but in this case I'm picking 256, as this is going to be part of the actual ABI. Differential Revision: https://reviews.freebsd.org/D7306
82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/*-
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* Copyright (c) 2003 Michael Bretterklieber
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <ctype.h>
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#include <err.h>
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#include <md4.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "crypt.h"
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/*
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* NT HASH = md4(str2unicode(pw))
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*/
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/* ARGSUSED */
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int
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crypt_nthash(const char *pw, const char *salt __unused, char *buffer)
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{
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size_t unipwLen;
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int i;
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static const char hexconvtab[] = "0123456789abcdef";
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static const char *magic = "$3$";
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u_int16_t unipw[128];
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u_char hash[MD4_SIZE];
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const char *s;
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MD4_CTX ctx;
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bzero(unipw, sizeof(unipw));
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/* convert to unicode (thanx Archie) */
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unipwLen = 0;
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for (s = pw; unipwLen < sizeof(unipw) / 2 && *s; s++)
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unipw[unipwLen++] = htons(*s << 8);
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/* Compute MD4 of Unicode password */
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MD4Init(&ctx);
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MD4Update(&ctx, (u_char *)unipw, unipwLen*sizeof(u_int16_t));
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MD4Final(hash, &ctx);
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buffer = stpcpy(buffer, magic);
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*buffer++ = '$';
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for (i = 0; i < MD4_SIZE; i++) {
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*buffer++ = hexconvtab[hash[i] >> 4];
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*buffer++ = hexconvtab[hash[i] & 15];
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}
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*buffer = '\0';
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return (0);
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}
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