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/*** WARNING - THIS CODE HAS NOT BEEN FINISHED! ***/

/*** The original PPPD code is written in a way to require either the UNIX DES

     encryption functions encrypt(3) and setkey(3) or the DES library libdes.

     Since both is not included in lwIP, MSCHAP currently does not work! */

/*****************************************************************************

* 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 "lwip/opt.h"

#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */

#if MSCHAP_SUPPORT /* don't build if not configured for use in lwipopts.h */

#include "ppp.h"

#include "pppdebug.h"

#include "md4.h"

#ifndef USE_CRYPT

#include "des.h"

#endif

#include "chap.h"

#include "chpms.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_CRYPT

static void Expand (u_char *, u_char *);

static void Collapse (u_char *, u_char *);

#endif

static 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_CRYPT

static 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;

  }

}

#endif

static 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 MSLANMAN

static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */

static void

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 */

#endif /* PPP_SUPPORT */