336 lines
9.0 KiB
C
336 lines
9.0 KiB
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
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char rcsid[] = "$FreeBSD$";
|
|
#endif
|
|
|
|
#ifdef CHAPMS
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
#include <syslog.h>
|
|
#include <unistd.h>
|
|
#ifdef HAVE_CRYPT_H
|
|
#include <crypt.h>
|
|
#endif
|
|
|
|
#include "pppd.h"
|
|
#include "chap.h"
|
|
#include "chap_ms.h"
|
|
#include "md4.h"
|
|
|
|
#ifndef USE_CRYPT
|
|
#include <des.h>
|
|
#endif
|
|
|
|
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. */
|
|
|
|
|
|
static void ChallengeResponse __P((u_char *, u_char *, u_char *));
|
|
static void DesEncrypt __P((u_char *, u_char *, u_char *));
|
|
static void MakeKey __P((u_char *, u_char *));
|
|
static u_char Get7Bits __P((u_char *, int));
|
|
static void ChapMS_NT __P((char *, int, char *, int, MS_ChapResponse *));
|
|
#ifdef MSLANMAN
|
|
static void ChapMS_LANMan __P((char *, int, char *, int, MS_ChapResponse *));
|
|
#endif
|
|
|
|
#ifdef USE_CRYPT
|
|
static void Expand __P((u_char *, u_char *));
|
|
static void Collapse __P((u_char *, u_char *));
|
|
#endif
|
|
|
|
static void
|
|
ChallengeResponse(challenge, pwHash, response)
|
|
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, MD4_SIGNATURE_SIZE);
|
|
|
|
#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(clear, key, cipher)
|
|
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",
|
|
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",
|
|
cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
|
|
#endif
|
|
}
|
|
|
|
#else /* USE_CRYPT */
|
|
|
|
static void
|
|
DesEncrypt(clear, key, cipher)
|
|
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",
|
|
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",
|
|
cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
|
|
#endif
|
|
}
|
|
|
|
#endif /* USE_CRYPT */
|
|
|
|
|
|
static u_char Get7Bits(input, startBit)
|
|
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(in, out)
|
|
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(in, out)
|
|
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(key, des_key)
|
|
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",
|
|
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",
|
|
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(rchallenge, rchallenge_len, secret, secret_len, response)
|
|
char *rchallenge;
|
|
int rchallenge_len;
|
|
char *secret;
|
|
int secret_len;
|
|
MS_ChapResponse *response;
|
|
{
|
|
int i;
|
|
MD4_CTX md4Context;
|
|
u_char hash[MD4_SIGNATURE_SIZE];
|
|
u_char unicodePassword[MAX_NT_PASSWORD * 2];
|
|
|
|
/* 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];
|
|
|
|
MD4Init(&md4Context);
|
|
MD4Update(&md4Context, unicodePassword, secret_len * 2); /* Unicode is 2 bytes/char */
|
|
|
|
MD4Final(hash, &md4Context); /* Tell MD4 we're done */
|
|
|
|
ChallengeResponse(rchallenge, hash, response->NTResp);
|
|
}
|
|
|
|
#ifdef MSLANMAN
|
|
static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */
|
|
|
|
static void
|
|
ChapMS_LANMan(rchallenge, rchallenge_len, secret, secret_len, response)
|
|
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[MD4_SIGNATURE_SIZE];
|
|
|
|
/* 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
|
|
|
|
void
|
|
ChapMS(cstate, rchallenge, rchallenge_len, secret, secret_len)
|
|
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'", 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;
|
|
}
|
|
|
|
#endif /* CHAPMS */
|