/*** WARNING - THIS CODE HAS NOT BEEN FINISHED! ***//****************************************************************************** chpms.c - Network MicroSoft Challenge Handshake Authentication Protocol program file.** Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.* Copyright (c) 1997 by Global Election Systems Inc.  All rights reserved.** The authors hereby grant permission to use, copy, modify, distribute,* and license this software and its documentation for any purpose, provided* that existing copyright notices are retained in all copies and that this* notice and the following disclaimer are included verbatim in any * distributions. No written agreement, license, or royalty fee is required* for any of the authorized uses.** THIS SOFTWARE IS PROVIDED BY THE 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 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.******************************************************************************** REVISION HISTORY** 03-01-01 Marc Boucher <marc@mbsi.ca>*   Ported to lwIP.* 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.*	Original based on BSD chap_ms.c.*****************************************************************************//* * chap_ms.c - Microsoft MS-CHAP compatible implementation. * * Copyright (c) 1995 Eric Rosenquist, Strata Software Limited. * http://www.strataware.com/ * * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by Eric Rosenquist.  The name of the author may not be used to * endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. *//* * Modifications by Lauri Pesonen / lpesonen@clinet.fi, april 1997 * *   Implemented LANManager type password response to MS-CHAP challenges. *   Now pppd provides both NT style and LANMan style blocks, and the *   prefered is set by option "ms-lanman". Default is to use NT. *   The hash text (StdText) was taken from Win95 RASAPI32.DLL. * *   You should also use DOMAIN\\USERNAME as described in README.MSCHAP80 */#define USE_CRYPT#include "ppp.h"#if MSCHAP_SUPPORT > 0#include "md4.h"#ifndef USE_CRYPT#include "des.h"#endif#include "chap.h"#include "chpms.h"#include "pppdebug.h"/*************************//*** LOCAL DEFINITIONS ***//*************************//************************//*** LOCAL DATA TYPES ***//************************/typedef struct {    u_char LANManResp[24];    u_char NTResp[24];    u_char UseNT;		/* If 1, ignore the LANMan response field */} MS_ChapResponse;/* We use MS_CHAP_RESPONSE_LEN, rather than sizeof(MS_ChapResponse),   in case this struct gets padded. *//***********************************//*** LOCAL FUNCTION DECLARATIONS ***//***********************************//* XXX Don't know what to do with these. */extern void setkey(const char *);extern void encrypt(char *, int);static void	DesEncrypt (u_char *, u_char *, u_char *);static void	MakeKey (u_char *, u_char *);#ifdef USE_CRYPTstatic void	Expand (u_char *, u_char *);static void	Collapse (u_char *, u_char *);#endifstatic void ChallengeResponse(	u_char *challenge,	/* IN   8 octets */	u_char *pwHash,		/* IN  16 octets */	u_char *response	/* OUT 24 octets */);static void ChapMS_NT(	char *rchallenge,	int rchallenge_len,	char *secret,	int secret_len,	MS_ChapResponse *response);static u_char Get7Bits(	u_char *input,	int startBit);/***********************************//*** PUBLIC FUNCTION DEFINITIONS ***//***********************************/void ChapMS(	chap_state *cstate,	char *rchallenge,	int rchallenge_len,	char *secret,	int secret_len){	MS_ChapResponse	response;#ifdef MSLANMAN	extern int ms_lanman;#endif	#if 0	CHAPDEBUG((LOG_INFO, "ChapMS: secret is '%.*s'\n", secret_len, secret));#endif	BZERO(&response, sizeof(response));		/* Calculate both always */	ChapMS_NT(rchallenge, rchallenge_len, secret, secret_len, &response);	#ifdef MSLANMAN	ChapMS_LANMan(rchallenge, rchallenge_len, secret, secret_len, &response);		/* prefered method is set by option  */	response.UseNT = !ms_lanman;#else	response.UseNT = 1;#endif		BCOPY(&response, cstate->response, MS_CHAP_RESPONSE_LEN);	cstate->resp_length = MS_CHAP_RESPONSE_LEN;}/**********************************//*** LOCAL FUNCTION DEFINITIONS ***//**********************************/static void ChallengeResponse(	u_char *challenge,	/* IN   8 octets */	u_char *pwHash,		/* IN  16 octets */	u_char *response	/* OUT 24 octets */){	char    ZPasswordHash[21];		BZERO(ZPasswordHash, sizeof(ZPasswordHash));	BCOPY(pwHash, ZPasswordHash, 16);	#if 0	log_packet(ZPasswordHash, sizeof(ZPasswordHash), "ChallengeResponse - ZPasswordHash", LOG_DEBUG);#endif		DesEncrypt(challenge, ZPasswordHash +  0, response + 0);	DesEncrypt(challenge, ZPasswordHash +  7, response + 8);	DesEncrypt(challenge, ZPasswordHash + 14, response + 16);	#if 0	log_packet(response, 24, "ChallengeResponse - response", LOG_DEBUG);#endif}#ifdef USE_CRYPTstatic void DesEncrypt(	u_char *clear,	/* IN  8 octets */	u_char *key,	/* IN  7 octets */	u_char *cipher	/* OUT 8 octets */){	u_char des_key[8];	u_char crypt_key[66];	u_char des_input[66];		MakeKey(key, des_key);		Expand(des_key, crypt_key);	setkey(crypt_key);	#if 0	CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",	       clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));#endif		Expand(clear, des_input);	encrypt(des_input, 0);	Collapse(des_input, cipher);	#if 0	CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",	       cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));#endif}#else /* USE_CRYPT */static void DesEncrypt(	u_char *clear,	/* IN  8 octets */	u_char *key,	/* IN  7 octets */	u_char *cipher	/* OUT 8 octets */){	des_cblock		des_key;	des_key_schedule	key_schedule;		MakeKey(key, des_key);		des_set_key(&des_key, key_schedule);	#if 0	CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",	       clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));#endif		des_ecb_encrypt((des_cblock *)clear, (des_cblock *)cipher, key_schedule, 1);	#if 0	CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",	       cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));#endif}#endif /* USE_CRYPT */static u_char Get7Bits(	u_char *input,	int startBit){	register unsigned int	word;		word  = (unsigned)input[startBit / 8] << 8;	word |= (unsigned)input[startBit / 8 + 1];		word >>= 15 - (startBit % 8 + 7);		return word & 0xFE;}#ifdef USE_CRYPT/* in == 8-byte string (expanded version of the 56-bit key) * out == 64-byte string where each byte is either 1 or 0 * Note that the low-order "bit" is always ignored by by setkey() */static void Expand(u_char *in, u_char *out){	int j, c;	int i;		for(i = 0; i < 64; in++){		c = *in;		for(j = 7; j >= 0; j--)			*out++ = (c >> j) & 01;		i += 8;	}}/* The inverse of Expand */static void Collapse(u_char *in, u_char *out){	int j;	int i;	unsigned int c;		for (i = 0; i < 64; i += 8, out++) {		c = 0;		for (j = 7; j >= 0; j--, in++)			c |= *in << j;		*out = c & 0xff;	}}#endifstatic void MakeKey(	u_char *key,		/* IN  56 bit DES key missing parity bits */	u_char *des_key		/* OUT 64 bit DES key with parity bits added */){	des_key[0] = Get7Bits(key,  0);	des_key[1] = Get7Bits(key,  7);	des_key[2] = Get7Bits(key, 14);	des_key[3] = Get7Bits(key, 21);	des_key[4] = Get7Bits(key, 28);	des_key[5] = Get7Bits(key, 35);	des_key[6] = Get7Bits(key, 42);	des_key[7] = Get7Bits(key, 49);	#ifndef USE_CRYPT	des_set_odd_parity((des_cblock *)des_key);#endif	#if 0	CHAPDEBUG((LOG_INFO, "MakeKey: 56-bit input : %02X%02X%02X%02X%02X%02X%02X\n",	       key[0], key[1], key[2], key[3], key[4], key[5], key[6]));	CHAPDEBUG((LOG_INFO, "MakeKey: 64-bit output: %02X%02X%02X%02X%02X%02X%02X%02X\n",	       des_key[0], des_key[1], des_key[2], des_key[3], des_key[4], des_key[5], des_key[6], des_key[7]));#endif}static void ChapMS_NT(	char *rchallenge,	int rchallenge_len,	char *secret,	int secret_len,	MS_ChapResponse *response){	int			i;	MDstruct	md4Context;	u_char		unicodePassword[MAX_NT_PASSWORD * 2];	static int	low_byte_first = -1;		/* Initialize the Unicode version of the secret (== password). */	/* This implicitly supports 8-bit ISO8859/1 characters. */	BZERO(unicodePassword, sizeof(unicodePassword));	for (i = 0; i < secret_len; i++)		unicodePassword[i * 2] = (u_char)secret[i];		MDbegin(&md4Context);	MDupdate(&md4Context, unicodePassword, secret_len * 2 * 8);	/* Unicode is 2 bytes/char, *8 for bit count */		if (low_byte_first == -1)		low_byte_first = (htons((unsigned short int)1) != 1);	if (low_byte_first == 0)		MDreverse((u_long *)&md4Context);  /*  sfb 961105 */		MDupdate(&md4Context, NULL, 0);	/* Tell MD4 we're done */		ChallengeResponse(rchallenge, (char *)md4Context.buffer, response->NTResp);}#ifdef MSLANMANstatic u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */static ChapMS_LANMan(	char *rchallenge,	int rchallenge_len,	char *secret,	int secret_len,	MS_ChapResponse	*response){	int			i;	u_char		UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */	u_char		PasswordHash[16];		/* LANMan password is case insensitive */	BZERO(UcasePassword, sizeof(UcasePassword));	for (i = 0; i < secret_len; i++)		UcasePassword[i] = (u_char)toupper(secret[i]);	DesEncrypt( StdText, UcasePassword + 0, PasswordHash + 0 );	DesEncrypt( StdText, UcasePassword + 7, PasswordHash + 8 );	ChallengeResponse(rchallenge, PasswordHash, response->LANManResp);}#endif#endif /* MSCHAP_SUPPORT */