399 lines
11 KiB
C
399 lines
11 KiB
C
/*** 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_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 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 */
|
|
|